Cloud Gate by Mr. Anish Kapoor Essay Example | Topics and Well Written Essays - 500 words

Cloud Gate by Mr. Anish Kapoor - Essay Example The Artist has used stainless steel as the medium of art. The artist has welded up about 168 pieces of stainless steel to make on giant work of art. Stainless steel is an alloy of iron; which cannot be stained but it loses it color and shows finger prints. The chromium in mixed in the alloy to make hard oxide coating on the surface; without the coating it becomes rust liker regular steel. The substance is hard and can be molded into any shape. The piece of art is placed at one of the most prime locations of Chicago; the reflective exterior would mirror the Chicago skyline; whereas its oval shape would twist and distort the image which is reflected; whereas, if a visitor would walk, the surface acts looks like a mirror of any funhouse as it reshapes the images. The underneath of the sculptor act as an indention whose mirror surface would provide numerous reflections of the subject situated below them. Sculptor is a form of art that is to create representational or abstract form, which can be of any shape. These form of arts does not tell a story; and the diversity in art is bought by the material and shapes used. Art is in the mind; these are ideas which are interpreted and then designed. Sculptor art is the most difficult art form; and if we include the size they represent a high level of imaginations.

Problem Solving Essay Example for Free

Problem Solving Essay In my efforts to solve a problem I have often begun by identifying the one issue that affects me and focus on the individual tasks that led to the problem attempting to use logical and critical thinking. I have hit upon the realization that this focus works well with simpler problems that need immediate clarification but it has proven appropriate that problems that are more difficult and require a more long-term and elaborate answer requires the use of a Systems Thinking approach. My failure to seek broad, long-term solutions has me stamping out grass fires while my house burns down. I have adopted Daniel Aronson ideas on systems thinking to aid in keeping â€Å"the big picture† when developing solutions. Critical and creative thinking processes are required when solving problems using systems thinking but I see the concentration shift from breaking down and examining individual tasks to studying how various system tasks shape both that system and the other systems in which it interacts. When using systems thinking, essential in arriving to an amicable and effective end state are the realizations that must be shared by the solution seekers. To which all players must realize that their roles affect other stakeholders and the desired outcome. Each seeker should study how past solutions have added to a problem and therefore any steps to correct a current problem should be evaluated for negative results and creation of other problems. Crucial too is the required realization that the desired end outcome is affected by outside influences which may not be obvious, controllable or correctable. Regarding the Army’s seven step problem solving process I make the following contribution and observations based on my â€Å"tacit† experience acquired during my career and specifically in completing capstone courses on decision making and development of thinking skills. 1. Identify the problem. This is where I find that people have to be hit in the face before they acknowledge a problem exists. In most instances awareness of a problem exists but is met with apathy unless someone is significantly impacted. But once ownership is taken a great idea is to concisely define the problem and state your desired outcome. Only then can I begin to look for solutions. If I don’t know where I am are going how will I know when I get there? 2. Gather information. Paraphrasing Confucius and Donald Rumsfeld’s thought on the unknown, finding out what I don’t know and then searching for someone who does is always my first choice. I then use that shared knowledge and direction to ensure I am considering the right information and possibly additional differing views of the problem on my path to a solution. 3. Develop Criteria In my development of tests to judge a solution I like to ensure every solution can be judged in using the same standard. I believe â€Å"there is more than one way to skin a cat,† so I want each solution to be fairly judged against the same criteria and not against other solutions. Having several solutions gives me flexibility in later steps. I have often used Substance, Relevance, Timeliness, Simplicity, and gotten good results. 4. Generate Solutions. During this step I have used a variety of methods to come up with solutions. Using established methods and techniques helps to capture and hopefully solidify ideas. Fishbone, Flow Chart, Cause and effect, are a few of many available. I use these same techniques later in step 6. I think at this point whatever method you may select the main goal is to get ideas flowing. My preferred method is brainstorming, by trying different and sometimes combinations of techniques I have found what works best for me. Also important in this step is establishing an open and non-judgmental environment where no solution team member holds back any idea no matter how â€Å"out there† it may seem. That idea might be the one that leads to an innovative answer. 5. Analyze possible solutions. Though each step is working off the ones that come before it I find this step to be the most dependent on the effort and results of all the previous steps. The old axiom â€Å"trash in – trash out† becomes apparent if I half-stepped through the proceeding steps. If I have spent the proper time and effort on steps 1-4 I discovered this one is the easiest to complete. 6. Compare Possible Solutions. In this step I go back to the techniques I mentioned in step 4. My preference is to use a Cause and Effect matrix that helps me to develop action alternatives and the outcome results of each solution. I also revert to my â€Å"go-to† test criteria and determine which solution best meets the exact or multiple criterion I feel are the most important to the particular situation. 7. Make and implement solutions. During the make phase of this step, frequently my role is as one who played a major role in completing the previous phases and is now presenting a plan for verdict and usually I am advocating an individual alternative. In this phase it is imperative for me to communicate and advise decision makers with confidence. If I am tentative in my recommendations buy in and implementation may not happen. After decision my â€Å"implement† role includes facilitating and coordinating the intent of the plan. Lastly it strikes me that even though I know thinking and decision making skills are keys to success I am always amazed that most want to pick the lock.

Speed Up Construction IBS Systems

Speed Up Construction IBS Systems Introduction In this chapter, the author reviewed works done by others through journals, articles, newspaper cutting, and quotes from authors and online articles collected. IBS system is a process to speed up the construction work and to minimize the dependency of labour on site. The objective of this study is further discussed about the barriers of contractor in implementing IBS. Besides that, this chapter also will focus on the basic review of IBS such as definitions, background, types and characteristics in IBS and have a basic introduction about the detail of IBS. Industrialised building is the term given to building technology where modern systematized methods of design, production planning and control as well as mechanized and automated manufacture are applied (Ingemar Lofgren and Kent Gylltoft, 2000) While Building system mean a building system includes design rules and a product system whose parts have compatible interfaces, thus permitting the use of several alternative components and assemblies is assured by means of a dimensional and tolerance system as well as connection and joint (Ingemar Lofgren and Kent Gylltoft, 2000) Definition of IBS There was no commonly accepted or agreed definition of IBS. Several authors have defined IBS as process or a technique. Blimas et. al. (2006) and Pan et. al. (2008) defined that IBS is often referred by literatures as off -site construction, off-site production, industrialised and automated construction. Warszawski (1999) explain in detail that an industrialized process is and investment in equipment, facilities, and technology with the objective of maximizing production output, minimising labour resource, and improving quality while a building system is defined as a set of interconnected element joint together to enable the designated performance of a building. Another definition by Trikha (1999) claimed that IBS also may be defined in which all building components such as wall, floor slab, column and staircase are mass produced either n factory or at site under strict quality control and minimal on site activities Another definition that clarified by Junid (1986) where IBS as process by which components of building are conceived, planned and fabricated, transported and erected at site. The system includes balance combination between software and hardware component. The software elements include system design, which is complex process of studying the requirement of the end user, market analysis and the development of standardise component, establishment of manufacturing and assembly layout and process, allocation of resources and materials and definition of a building designer conceptual framework.The software elements provide a prerequisite to create the conducive environment for industrialised to expand. According to Juunid (1986), the hardware elements are categorised into three major groups. These include frame or post and beam system, panel system, and box system. The framed structures are defined as those structure that carry the loads through their beams and girders to columns and to the ground whilst in panel system load are distributed through large floor and wall panels. The box systems include those system that employ three-dimensional modules (or boxes) for fabrication of habitable units are capable of withstand load from various directions due to their internal stability. CIDB defined IBS as construction system whereby the components are manfactured in a factory, on-site or off-site, then positioned and assembled into structures with minimal addtional site work. Classifications of IBS This section will focus on the classification of the building system that are published internationally and in Malaysia There are four types of building system under IBS in Malaysia and there are namely conventional column-beam-slab frame systems with timber and plywood as formwork, cast in-situ system with steel or aluminium as formwork, prefabricated system and the composite building system is shown in figure 2.1. Each building system is represented by its construction technology, functional and geometrical configuration (Badir et al, 1998). (cited at Thanoon et. al., 2003) According to Majzub (1977) has different concept in classifying building system that is the relative weight of the components should be used as a basis for building classification shown in figure 2.2. The factor of weight has significant impact on the transportability of the components and also has influences on the production method of the components and their erection method on site. This classification method is found to be inadequate to incorporate other building system flourish recently. There are five types of IBS had being used in Malaysia: (IBS Road Maps 2003-2010) Type 1: Pre-Cast Concrete Framing, Panel and Box System The most common group of IBS products is pre-cast concrete of elements in construction industry. For example, there are including columns, beams, slabs, Three-Dimension (3D) components (balconies, staircase, toilet, lift chambers), permanent concrete formwork, and so on. (CIDB, 2005). Pre-cast concrete framing, panel and box system is under categories of prefabricated system. The advantage using this is because it cans minimum waste due to work environment in factory is easier to control. Panel system is use for the construction of interior walls and exterior walls offer speed of construction in many ways. For box system will achieve ultimate objective of industrialization that is a maximum saving of human labour on site. Type 2: Steel Formwork Systems This system considered as least prefabricated IBS, as they generally involve site casting and subject to offer high quality finishes and fast construction with less site labour can come in tunnel formwork, beams, columns, and slab moulding forms permanent steel formworks (metal decks) and so on. (CIDB, 2005) The steel formwork is prefabricated in the factory and then installed on site. Type 3: Steel Framing System This system always be the popular choice and used intensively in the fast-track construction of skyscrapers. Recent development in this types system included the increased usage of light steel trusses. Steel is non combustible material and improves fire safety and reduces amount of structural damages in the event of a fire happen. Example: Steel beam, columns, portal frames, roof trusses. (CIDB, 2005). Steel framing also consider as prefabricated system and it to be erected whereby welding at joints are conducted. This system cans faster the progress construction. Type 4: Prefabricate Timber Framing System While the latter are more popular, timber building frame offering interesting designs from dwelling units to buildings requiring high aesthetical values such as chalets for resorts Example: Timber frame, timber roof trusses (CIDB, 2005). The advantage of the system is mainly in the interior flexibility, as large space can be used for different functions and can be easily changed or modified according to the use. Type 5: Block Work System This system has revolutionizes by the development and usage of interlocking concrete masonry units (CMU) and lightweight concrete blocks. The tedious and time-consuming traditional brick-laying tasks are greatly simplified by the usage of there effective alternative solutions. Block work system also consider under prefabricated system. The benefits of block work system are faster construction and increase bricklayer longevity. Moreover, its also increased energy savings like lightweight concretes resistance to heat flow is twice of medium and heavy weight concrete, its mean that less heating/cooling energy is needed. Characteristics of IBS It is important to have the following characteristics only consider to be accepted as part of the IBS and ensure the achievement of proven benefits of IBS. Each of them will be discuss briefly at below (CIDB 2008): Industrial production of components though pre-fabrication; or highly mechanized in-situ processes. For example, permanent steel formwork Reduced labour during pre-fabrication of the components and site works. Modern design and manufacturing methods involving information Technology such as the usage of Computer Aided design (CAD) and Computer Aided Manufacturing (CAM) Systematic Quality control such as ISO 9000 principles Open Building Concept i.e permitting the hybrid applications, and adaptable to standardization and Modular Coordination (MC) Implementation Level of IBS in Malaysia The use of IBS have various advantages such as the reduction dependency of foreign workers, less wastage, less volume of building materials, increased environmental and construction site cleanliness and better quality control compare to conventional method. These advantages also promote a safer and more organised construction site, and reduce the completion time of construction. Many world-class Malaysian developers have chosen IBS over the conventional methods for important projects such as the Petronas Twin Towers, Putrajaya, KL Sentral, and KLIA. (IBS Roadmap, 2003 -2010) Even so, the usage level of IBS in building is still low. From a survey conducted by CIDB Malaysia, the usage level of IBS in the local construction industry stands at only 15% (IBS Survey 2003). The early efforts of the Government to encourage the use of IBS in the construction sector has yet to garner a good response, and this sector is still practicing conventional construction methods that have proven time and again to be wasteful, dangerous and messy. Relatively, the low labour cost in this country is the root cause of the industry failing to reform and being complacent with the current level of productivity, quality and safety. (IBS Roadmap, 2003 -2010) Moreover, according to the newspaper the star 2009 stated that Jamilus explained that IBS was a construction technique in which components were manufactured in a controlled environment (on-site, off-site), transported, positioned and assembled into a structure with minimal additional site work. Beside that, out of 1,400 contractors in Johor, there only 4% of it are using this systems. Moreover, he said that since year 2008, there only 51 contractors in the state have been reported to use the IBS system in their building projects and the number were expected improve in time. (The star, 2009) Malaysias Experiences in IBS The usage of IBS is not new in the Malaysia construction industry. The idea using IBS in Malaysia was first purpose during the early 60s when the Minister housing and Local Government visited several European countries and evaluated their building system performance. At the time, the government makes a big decision to give a try on a two pilot projects using IBS concept. The first project, Pekeliling Flat was constructed along Jalan Pekeliling with construction of 7 blocks of 17 storey flats, and 4 blocks of 4 storey flats comprising around 3,000 units of low cost flats and 40 storey shop lot and this project using large panel industrialized prefabricated systems. On the other hand, the second project was built in Penang with the construction of 6 blocks of 17 storey flats and 3 blocks of 18 storey flats comprising 3,699 units and 66 shop lots along the Jalan Rifle Range and this project was using the French Estiot System (Din, 1984). Even though the first implementation IBS was not successful due to the failure to keep within cost estimation but there are some successful adoption too. Among the significant projects that implement IBS are including KL Sentral. KL Convention Centre, KLIA, etc Following is the Successful implemented of IBS throughout Malaysia (CIDB Malaysia, 2003) Year 2007 Stormwater Management and Road Tunnel (SMART Tunnel), Kuala Lumpur The Spring Shopping Mall, Kuching, Sarawak Year 2006 Kuching International Airport, Kuching, Sarawak Persada Johor International Convention Centre, Johor Bahru Year 2005 Serdang Hospital, Serdang, Selangor The Curve, Mutiara Damansara, Selangor Year 2001 Kuala Lumpur Sentral ( KL Sentral), Kuala Lumpur Likas Stadium, Kota Kinabalu, Sabah Year 1998 Kuala Lumpur International Airport (KLIA), Sepang, Selangor Malawati Indoor Satdium, Bukit Jalil, Selangor Year 1997 Petronas Twin Tower, Kuala Lumpur Bukit Jalil, Bukit Jalil, Salangor Year 1984 Daybumi Complex, Kuala Lumpur Year 1981 High end bungalows and low cost houses throughout Selangor The Advantages for IBS adoption in Construction Industry There are some several advantages using IBS (MCRJ, 2009) 1. Reduce Remittances by foreign worker: The Government aimed to achieve 100 percent usage of IBS and to reduce to 15 percent or approximately 50,000 of foreign workers in the construction industry by 2010. With the current foreign workers totaling 227,000, the remittances of the foreign workers amounted to about 7.5 billion. It is expected that the Government would be able to reduce the remittances with the full implementation of IBS. (Bernama.com, 2006) 2. Enhance Efficiency of Construction Process and Higher Productivity: IBS is a methodology whereby a local construction industry is driven towards the adoption of an integrated and encouraging key players in the construction industry to produce and utilize pre-fabricated and mass production of the building at their work sites. This will help to enhance the efficiency of construction process, allowing a higher productivity, quality, time and cost saving. (CIDB, 2004) 3. Produce Better Product: IBS promises elevated levels of expertise throughout the industry, from manufacturers, installers, engineers, planners, designers, and developers. The benefits of IBS will ultimately produce better products for the population (CIDB, 2003) 4. Reduce Wastage, Less Site Materials, Costs, Cleaner and Neater Environment: The IBS, which enables on-site prefabricated or pre-cast building components manufactured at factories offers minimal wastage, less site materials, cleaner and neater environment, controlled quality, and lower total construction cost (CIDB, 2003). For example, the repetitive use of system formwork made up of steel, aluminium, etc and scaffolding provides considerable cost savings (Bing et al. 2001). 5. Higher Quality of Component: An industrialised building system component produces higher quality of components attainable through careful selection of materials, use of advanced technology and strict quality assurance control (Din,1984) 6. Reduce Labour at Site: Prefabrication takes place at a centralised factory, thus reducing labour requirement at site. This is true especially when high degree of mechanisation is involved (Warszawski, 1999) 7. Faster Completion: An industrialised building system allows for faster construction time because casting of precast element at factory and foundation work at site can occur simultaneously. This provides earlier occupation of the building, thus reducing interest payment or capital outlays (Waleed et al., 2003) 8. Not Affected by Adverse Weather Condition: Construction operation is not affected by adverse weather condition because prefabricated component is done in a factory controlled environment (Waleed et al., 2003) 9. Flexible Design: An industrialised building system allows fexibility in architectural design in order to minimise the monotony of repetitive facades (Warszawski, 1999). An industrialised building system provides flexibility in the design of precast element as well as in construction so that different systems may produce their own unique prefabrication construction methods (Zaini, 2000) Barriers of Adoption in Malaysia Construction Industry IBS can replace the conventional building system which is labour oriented However, since the first project of IBS not well accepted by construction parties because of fail to deal with the risks such failure of keep within the cost estimate. For example, the first project incurred 8.1 % higher costs than a similar building that using conventional construction method, while the second project was 2.6% lower than the cost. Both projects also completed in 27 months in term of compare to the construction speed but are inclusive the time of set up the recasting factories too. When come to the quality, the conventional method seems have better quality than IBS. In conclusion, there is a competitive with conventional construction method. Even though IBS is good to implement due to its advantages but the implementation of usage level is still very low. According to Waleed et. al. (2003), the common consensus of all the stakeholders of construction in Malaysia is that, the IBS implementation in Malaysian building construction industry is still very low compared to the conventional methods. This is due to several reasons(MCRJ, 2009): 1. Costs and Return Investment: Wide swings in houses demand, high interest rate and cheap labour cost, make it difficult to justify large capital investment. At present there is an abundance of cheap foreign workers in Malaysia and contractors prefer to use labour intensive conventional building system because it is far easier to lay off workers during slack period. The economic benefits of IBS are not well documented in Malaysia and the past experiences indicated IBS is more expensive due to fierce competition from conventional building system. 2. Lack of skilled and knowledgeable manpower: Fully prefabricated construction system requires high construction precision. Malaysian labour force still lack of skilled workers in IBS implementation. 3. The Practices: The construction industry is very fragmented, diverse and involves many parties. Consensus is required in the use of IBS during planning stage. 4. Knowledge based: Lack of Research Development (RD) in the area of novel building system that uses local materials. Majorities of IBS in Malaysia are imported from developed countries, thus driving up the construction cost. Engineering degrees in local universities seldom teach about the design and construction of IBS. 5. Low Quality: The use of IBS in Japan and Sweden are so successful due to high quality  and high productivity but it sis the opposite in Malaysia. Previous projects constructed  with IBS concept were of low quality and high construction cost. 6. Lack of Incentive and Awareness: Due to the lack of incentive and promotion from government in the use of IBS, many many architects and engineers are still unaware of the basic elements of IBS such as modular co-ordination. 7. Lack of Scientific Information: An IBS system can only be acceptable to practitioners if its major advantages are valuable compared to the conventional system. However, up to date, there is inadequate corroborative evidence to substantiate the benefits of IBS system. It is therefore, arguable that the implementation of IBS is particularly hindered by lack of scientific information (Badir et al., 2002) 8. Wastage of Material: Standardization of building elements faces resistance from the construction industry due to aesthetic reservation and economic reason. One good example of this is when a 300mm thick modular standardized floor slab has to be used although a 260mm thick floor slab can achieve the similar structural performance. This results wastage of material (Waleed et al., 2003) Summary of the Chapter Nowadays in Malaysia, IBS still being developed and applied in new building. Mean while, the implementation level is still very low what has anticipate by the government. The purpose of IBS is very clear as an alternative for conventional method and also reduces the dependency of labour, and increase the performance in time, cost, and quality. The Government of Malaysia promote IBS component to the construction industrials. In the literature review have proved that there are many benefits of IBS but still is low usage among contractors and the implementation of using IBS level is still very low.

The Relation between State and Society According to Karl Marx Essay

The Relation between State and Society According to Karl Marx 'The executive of the modern state is but a committee for managing the common affairs of the whole bourgeoisie.' (1) This is the clearest assertion of the basic tenet of Marxist theory of the state. The state acts in the interests of the dominant class. Marx never elaborates on the topic of the state - the task of putting forward a full theory of the state was one the aims of the incomplete Das Kapital. In order then to find a Marxist theory of the state, modern scholars must piece one together from the references scattered throughout Marx's work. The above quote, however, is by far the most succinct way of putting forward the basic message of a Marxist theory of the state. The question is in two parts. In answer to the first, the roots of Marxist theory of the state shall be found in Hegel's political philosophy. It shall be shown that although Marx's conception of the state is just an adaptation of Hegel's, the application of that conception in relation to society is more original. The second part of the question demands an examination into the defensibility of Marx's state theory. The fact that Marx never clarifies his theory gives modern Marxists a great deal of leeway in adapting Marxist theory to counter its critics. Several different ways of defending Marxist theory will be set out below. In his Philosophy of Right, Hegel makes the important and influential distinction between Civil Society and the Political State. Briefly, the Political state is the total of the objective institutions of public authority, involving legislative, fiscal and supervisory powers, etc. There is also a degree of subjectivity, in the form of public opinion expressed t... ... the causal relation between state and society is reversed. For Marx, the economic structure of society produces a dominant class, and the state reflects that dominance, and helps to reproduce it. In the final analysis, neo-Marxist scholars are able to form coherent and defensible positions on the state, while not betraying the essential Marxist nature of their theories. Karl Marx, Manifesto of the Communist Party. Z. A. Pelcynski, The Hegelian Conception of the State. Karl Marx, review of Girardin's Le Socialisme et 'Impà ´t. J. Schumpeter, Capitalism, Socialism and Democracy. Karl Marx, A German Ideology. R. Miliband, Marx and the State. N. Poulantzas, The Problem of the Capitalist State. R. Miliband, The State in Capitalist Society. C. Offe, Social Policy and the Theory of the State. F. Parkin, Marxism and Class Theory: A Bourgeois Critique. The Relation between State and Society According to Karl Marx Essay The Relation between State and Society According to Karl Marx 'The executive of the modern state is but a committee for managing the common affairs of the whole bourgeoisie.' (1) This is the clearest assertion of the basic tenet of Marxist theory of the state. The state acts in the interests of the dominant class. Marx never elaborates on the topic of the state - the task of putting forward a full theory of the state was one the aims of the incomplete Das Kapital. In order then to find a Marxist theory of the state, modern scholars must piece one together from the references scattered throughout Marx's work. The above quote, however, is by far the most succinct way of putting forward the basic message of a Marxist theory of the state. The question is in two parts. In answer to the first, the roots of Marxist theory of the state shall be found in Hegel's political philosophy. It shall be shown that although Marx's conception of the state is just an adaptation of Hegel's, the application of that conception in relation to society is more original. The second part of the question demands an examination into the defensibility of Marx's state theory. The fact that Marx never clarifies his theory gives modern Marxists a great deal of leeway in adapting Marxist theory to counter its critics. Several different ways of defending Marxist theory will be set out below. In his Philosophy of Right, Hegel makes the important and influential distinction between Civil Society and the Political State. Briefly, the Political state is the total of the objective institutions of public authority, involving legislative, fiscal and supervisory powers, etc. There is also a degree of subjectivity, in the form of public opinion expressed t... ... the causal relation between state and society is reversed. For Marx, the economic structure of society produces a dominant class, and the state reflects that dominance, and helps to reproduce it. In the final analysis, neo-Marxist scholars are able to form coherent and defensible positions on the state, while not betraying the essential Marxist nature of their theories. Karl Marx, Manifesto of the Communist Party. Z. A. Pelcynski, The Hegelian Conception of the State. Karl Marx, review of Girardin's Le Socialisme et 'Impà ´t. J. Schumpeter, Capitalism, Socialism and Democracy. Karl Marx, A German Ideology. R. Miliband, Marx and the State. N. Poulantzas, The Problem of the Capitalist State. R. Miliband, The State in Capitalist Society. C. Offe, Social Policy and the Theory of the State. F. Parkin, Marxism and Class Theory: A Bourgeois Critique.

Spectrophotometry

Spectrophotometry: is a device to measure the amount of light in the material used. this device consists of two parts: the first is the light source, and the second is the photometer . the work principle of this device : the liquid or material that we want to measure the elements inside is placed in a tub, this tube is then placed between the light source and the photometer . So that the amount of light passing through the sample is measured by photometer. when a photometer is exposed to light, it acquires or generates an electrical signal that changes with the amount of light absorbed by the liquid . this change in light absorption depends on the change in the concentration of the substance. the way work this device: this device it measures the absorption of light by liquid materials at different wavelengths, and thus can identify a number of unknown substances or calculate known concentrations of materials . Stepped flow Technique:is a rapid mixing device, to study the kinetics of quick chemical reactions in solutions . this device contains two reactants which are kept in separate reservoirs and are prevented from flowing freely . the interaction starts by installing the reactants in the device. these materials are then released to the mixing chamber, which mixes these interacting materials , the reaction is then monitored by observing the change in the absorption of the reaction solution . When the reaction progresses, it fills the â€Å"stop syringe† that expands until it reaches the point at which the interaction reaches a continuous flow , thus stopping flow or interaction sodium reacts strongly and quickly with water and produces a solution of sodium hydroxide and hydrogen gas, a colorless solution. During the reaction sodium can be heated and It may ignite and burn with an orange flame . Hydrogen gas released during the combustion process reacts with oxygen in the air . The resulting solution is basic because of the melting of sodium in the water. this interaction between sodium and water is an exothermic reaction. sodium reaction with water is the closest to explosion. Na +2 H2O ?2 NaOH + H2. this search used this interaction and because it is fast, it uses the stepped-flow techniques method to control it Rate=- (d[Na])/dt=-1/2 (d[H2O])/dt=1/2 (d[NaOH])/dt+(d[H2])/dt Spectrophotometry Spectrophotometry is a vary specific type of Spectroscopy which measures how much light is absorbed by measuring the intensity of the light beam that is not absorbed (transmittance).The word â€Å"Spectra† means the range of wavelength, â€Å"Photo† means light or photons and â€Å"Metry† is the measuring how much light a chemical substance absorbs which it calls the absorbance. But what we do is measure how much light of the original light beam gets through (transmittance). So, those are related to each other absorbance and percent transmittance mathematically.The basic way to works is the incident light which usually contain different kind of wavelength, for example when we see something have a red color that means the object is absorbs all colors' wavelength except red. It is helpful to know the color wheel because the color wheel will help you to understand or getting the idea of where in the visible spectrum you would except to see the best absorbance.The work principle of spectrophotometry in (Figure 1): Firstly, we have a light source typically white light contains all wavelengths. We want to collimate the light or make all the wavelengths parallel to one another so, the special collimator or lens can does that, then we pass the light beam through a prism to splits the light into its various wavelength so, for regular white light you get all the colors of the rainbow. Spectrophotometer does not just shine all that light at the sample, it shines a vary specific wavelength of light and we can choose that normally by moving a slit in the way of the one wavelength of light or color that we would like to shine through the sample. That particular color of light will then shine through the sample, some of it will be absorbed and some of it will be transmitted. (Io) is the incident light that is the first enters, and (It) is the amount of light that is transmitted through after some has been absorbed. The remaining light that gets through hits a photocell, photocell is a solid-state detector that picks up how much light, then it prints out on a digital display either absorbance how much was taken away or percent transmittance how much light go through and those two are related. Briefly,  you can determine the unknown concentration of the sample by using Beer-Lambert Law which states: there is a linear relationship between the absorbance and the concentration of a sample. Mathematical formula of Beer's Law is: A=?lcA  is the measure of absorbance.?  is the molar extinction coefficient or molar absorptivity.l  is the path length.-439528256528center842086600left221268Figure 100Figure 1c  is the concentration (which is required).There are special techniques for investigating fast reactions which have half-live less than a few secondsLet us take an example for the simplest fast reaction technique (the continuous flow method) which will be used to study the kinetics of the formation of the ferric thiocyanate complex FeSCN+22120900145742100 For the fast reaction between ferric and thiocyanate ions in an acid solution of constant pH, the observed behavior is consistent with the simple mechanism: center2191301Where kf is the bimolecular forward rate constant and kr is the unimolecular reverse rate constant. So, the rate law from this equation is:center27279960Recall that the equilibrium constant K is related to the rate constant by:15775923297435 Where the sign ? means the equilibrium (t=?) value:31439213903453641206384715300At any time (t), Using these relations, and then rewrite the equation in the form:1965852489141700To simplify the integration of this equation, we will choose the experimental conditions such that [Fe+3] ;; [SCN-]. This will allow us to assume that [Fe+3] is essentially constant during the reaction. The initial conditions are chosen so that [FeSCN+2]0= at t=0 we find:This an approximate solution which becomes exact only when [Fe+3] is constant. In real practice, [Fe+3]0 will be chosen to be ten times larger than [SCN-]0, so that [Fe+3] will be more by about 10 percent during the reaction.2803525690943500-569595690918400If a plot of ln](FeSCN+2)? – (FeSCN+2)[ versus t is linear, then the first order dependence on [SCN-] and [FeSCN+2] is confirmed. The rate dependence on [Fe+3] has been established as first order. -5779714625Schematic diagram of system for driving reactant solution.00Schematic diagram of system for driving reactant solution.452856889798Spectrophotometry setup00Spectrophotometry setupProcedure for an example of use Spectrophotometer technique in fast reaction: Firstly, turn on the spectrophotometer and leave it warm up before using. The wavelength setting should be 455 nm throughout the entire experiment. With both reagent stopcocks A and B and the vent stopcock V closed, slowly increase the gas pressure on the reagent solutions until Bourdon pressure gauge indicates about 500 Torr pressures above 1 atm. With the outlet stopcock C open, open and close the reagent stopcocks A and B several times to make sure that both solutions are flowing smoothly and to remove any air bubbles from the system. Use a beaker to catch the outflow from the capillary tube. Then set the capillary frame at the first fiducial mark which nearest to the mixing chamber, and carry out the three following steps:1- Open Stopcock A and allow the Fe+3 solution to flow for a sufficient time to remove from the capillary tube any solution containing FeSCN+2 species. Then close stopcock A and the outlet stopcock C.2- Open the outlet stopcock C then turn both stopcocks A and B to their fully open positions. Catch the outflow of solution from the capillary in a beaker until the flow becomes stable. Then quickly switch the outlet tube from the beaker to a volumetric flask and simultaneously start a timer. When It is full, stop the timer and record the time. Return the outlet tube to the beaker. Then carrying out the above flow rate measurement, you should determine the absorbance A of the reaction mixture and record that value together with the distance x from the mixing chamber. Work quickly to avoid any interference of the reagent solution.3- When both the flow and absorbance measurements are complete, close the outlet stopcock C and then close both stopcock A and B. This is a crucial step in the procedure. If A and B are left open, solution may siphon from one carboy to the other. After a few minutes, determine the absorbance again to obtain the infinite time value. Verify that this value does not change after one more minute. For the next run, move the capillary support frame so as to line up the second fiducial mark and repeat the first and third steps at this this new distance setting, be careful in moving the capillary support frame.Make two runs at each of the six or seven positions along the capillary tube. Use special care in making the absorbance readings at large values of x. If time permits, you should also take data at a different driving pressure. Either increase or decrease the gas pressure depending on weather you need more data at low percent reaction or at high, but it may not be safe to exceed about 700 torr overpressures.In this experiment, more of solution A will be used up than solution B if the Fe+3 solution is always used in the first step to make the zero adjustment of the spectrophotometer at each distance setting. The resulting change in the liquid level for A relative to that for solution B may change the relative flow rates of these solutions. This can be avoided by alternating the use of solution A and B for making the zero adjustments.References:1- Physical chemistry by  Gilbert William Castellan.2- msu.edu.3- Wiley online library. 4- UKessay.5- AliHayek.com Spectrophotometry 5448300-52387500-523875-53340000 Kinetics Chemistry Student Name:Saba Ahmad Bin Humaid Supervisor:Dr. Alia Abdulaziz Alfi Group Number: 41438-1439 Spectrophotometry is a technique which can be used for identifying reactants' concentrations.Spectrophotometry is an absorbance device which can measures the fraction of the incident light transmitted through a solution. More clearly, it is used to measure the amount of light that passes through particles of the sample and by differentiation of the initial intensity of light reaching the sample, it indirectly measures the amount of light absorbed by that sample. Spectrophotometers are made to transmit light of narrow wavelength ranges. A certain compound will not absorb all wavelengths evenly that's why things have different colours. Some compounds absorb only wavelengths outside of the visible light spectrum and that's why there are colourless solutions such as water. Because different compounds absorb light at different wavelengths, a spectrophotometer can be used to differentiate compounds by analyzing the type of wavelengths absorbed by a given sample. In addition of that, the amount of light absorbed is directly proportional to the concentration of absorbing compounds in that sample, so a spectrophotometer can also be used to determine concentrations of compounds in solution.To studying a compound in solution by spectrophotometry, you put it in a sample holder called a cuvette and place it in the spectrophotometer. Light of a specific wavelength passes through the solution inside the cuvette and the amount of light transmitted or absorbed by the solution is measured by a light meter. While a spectrophotometer can exhibit measurements as either transmittance or absorbance, in biological applications we are usually interested in the absorbance of a given sample. Because other compounds in a solution (or the solvent itself) may absorb the same wavelengths as the compound being analysed, we compare the absorbance of our test solution to a reference blank. The reference blank should contain everything found in the sample solution except the substance you are trying to analyse or measure.Briefly,-5143507591425003467100758190000  you can determine the unknown concentration of the sample by using Beer Lambert Law which states: there is a linear relationship between the absorbance and the concentration of a sample. Mathematical formula of Beer's Law is: A=?lcWhere:A  is the measure of absorbance.?  is the molar extinction coefficient or molar absorptivity.l  is the path length.c  is the concentration (which is required).There are special techniques for investigating fast reactions which have half-live less than a few secondsLet us take an example for the simplest fast reaction technique (the continuous flow method) which will be used to study the kinetics of the formation of the ferric thiocyanate complex FeSCN+22120900145742100 For the fast reaction between ferric and thiocyanate ions in an acid solution of constant pH, the observed behavior is consistent with the simple mechanism: center2191301Where kf is the bimolecular forward rate constant and kr is the unimolecular reverse rate constant. So, the rate law from this equation is:center27279960 Recall that the equilibrium constant K is related to the rate constant by:15775923297435Where the sign ? means the equilibrium (t=?) value:31439213903453641206384715300At any time (t), Using these relations, and then rewrite the equation in the form:1965852489141700To simplify the integration of this equation, we will choose the experimental conditions such that [Fe+3] ;; [SCN-]. This will allow us to assume that [Fe+3] is essentially constant during the reaction. The initial conditions are chosen so that [FeSCN+2]0= at t=0 we find:This an approximate solution which becomes exact only when [Fe+3] is constant. In real practice, [Fe+3]0 will be chosen to be ten times larger than [SCN-]0, so that [Fe+3] will be more by about 10 percent during the reaction.2803525690943500-569595690918400If a plot of ln](FeSCN+2)? – (FeSCN+2)[ versus t is linear, then the first order dependence on [SCN-] and [FeSCN+2] is confirmed. The rate dependence on [Fe+3] has been established as first order. -5779714625Schematic diagram of system for driving reactant solution.00Schematic diagram of system for driving reactant solution.452856889798Spectrophotometry setup00Spectrophotometry setupProcedure for an example of use Spectrophotometer technique in fast reaction: Firstly, turn on the spectrophotometer and leave it warm up before using. The wavelength setting should be 455 nm throughout the entire experiment. With both reagent stopcocks A and B and the vent stopcock V closed, slowly increase the gas pressure on the reagent solutions until Bourdon pressure gauge indicates about 500 Torr pressures above 1 atm. With the outlet stopcock C open, open and close the reagent stopcocks A and B several times to make sure that both solutions are flowing smoothly and to remove any air bubbles from the system. Use a beaker to catch the outflow from the capillary tube. Then set the capillary frame at the first fiducial mark which nearest to the mixing chamber, and carry out the three following steps:1- Open Stopcock A and allow the Fe+3 solution to flow for a sufficient time to remove from the capillary tube any solution containing FeSCN+2 species. Then close stopcock A and the outlet stopcock C.2- Open the outlet stopcock C then turn both stopcocks A and B to their fully open positions. Catch the outflow of solution from the capillary in a beaker until the flow becomes stable. Then quickly switch the outlet tube from the beaker to a volumetric flask and simultaneously start a timer. When It is full, stop the timer and record the time. Return the outlet tube to the beaker. Then carrying out the above flow rate measurement, you should determine the absorbance A of the reaction mixture and record that value together with the distance x from the mixing chamber. Work quickly to avoid any interference of the reagent solution. 3- When both the flow and absorbance measurements are complete, close the outlet stopcock C and then close both stopcock A and B. This is a crucial step in the procedure. If A and B are left open, solution may siphon from one carboy to the other. After a few minutes, determine the absorbance again to obtain the infinite time value. Verify that this value does not change after one more minute.For the next run, move the capillary support frame so as to line up the second fiducial mark and repeat the first and third steps at this this new distance setting, be careful in moving the capillary support frame.Make two runs at each of the six or seven positions along the capillary tube. Use special care in making the absorbance readings at large values of x. If time permits, you should also take data at a different driving pressure. Either increase or decrease the gas pressure depending on weather you need more data at low percent reaction or at high, but it may not be safe to exceed about 700 torr overpressures.In this experiment, more of solution A will be used up than solution B if the Fe+3 solution is always used in the first step to make the zero adjustment of the spectrophotometer at each distance setting. The resulting change in the liquid level for A relative to that for solution B may change the relative flow rates of these solutions. This can be avoided by alternating the use of solution A and B for making the zero adjustments.References:1- Physical chemistry by  Gilbert William Castellan.2- msu.edu.3- Wiley online library. 4- UKessay.5- AliHayek.com

Dry September Essays

Dry September Essays Dry September Paper Dry September Paper The William Faulkner’s short story Dry September, published in 1931, takes place in a fictional residence of Jefferson, which is located somewhere in the southern community. Faulkner wanted to release something that will stretch our truth-sorting muscles, because this story is a story of rumor. Rumors are part of our society, and they seem to be part of our lives too because it is always been very difficult to clear out the truth of any situation. So, all the situations we are going through could be a part of a rumor’s factory. Two main characters that the rumor is about are helping Faulkner’s story; the Nigger called Will Mayes, raped a white woman, Minnie Cooper. The rumor, the story, pops up through the ‘’bloody September twilight’’. The barbershop is a place where it all begun. When it comes to such things, when the story becomes a main discussion, we got to choose, will we accept thing as true without any proof, or will we base our conclusion on facts? So, this story is about how the main characters, as barber Henry, McLendon, youths from the barbershop who are representing the southern community, investigate a rumor. It is ‘’Bloody September night’’ and a crew of both young people and strangers are taking a discussion in a barbershop owned by Henry ‘‘Hawkshaw’’ and some other barbarians. They were discussing a rumor, which owns the day in Jefferson residence. Is Will innocent or not, many of them where already sure of that, because how could it be that a nigger’s word is taken before a white woman’s? Not a speak. The fellows agree that the young will had done something wrong without investigating the problem. Then, John McLendon, who commanded troops at the front in France, show up to collect the fellows to punish the nigger for the crime he had done. His bad attitude rapidly affects other people’s attitudes in the shop and they leave the room with a lot of hate inside themselves. But not all of them think Will is done something bad, Henry defends him by saying to his fellows that he knows him personally, and that that couldn’t be him. Even if he tries to show them that the town isn’t just ‘’black’’ and ‘’white’’, and that they should seem happy by having such ‘’good’’ kind of niggers in there, the people ignore him. He leaves the shop in hope to stop and persuade them not to hurt him because of his innocence. He gets in car. They got the confused Will, handcuff him and put in the car too. Suddenly, Henry says he got sick stomach and wants out. But McLendon says that he could jump out because he isn’t stopping the car. That’s what he does. He jumps out and hides in dust-sheathed weeds. Afterwards, McLeadon is going home, arguing with his wife who was waiting for him even if it was midnight. He lays his gun on the table beside the bed, and there was no sound, the dark world seemed to lie stricken beneath the cold moon and the lidless stars. Minnie Cooper is a 40 years old unmarried woman. She is haggard looking, exhausted, always wearing bright dresses. At the end of the story, she has a collapse, she screams and laughs in the middle of the cinema. Her ‘’friends’’ lead her home, wondering Will really attacked her or not. I found some symbols, which may refer to some of society’s main characterisations; characters’ minds are locked up due to surroundings and they can’t let their passion and interest see things in a different way than in a violent. So, wrong attitudes, can never lead us to a problem’s resolvability, but unfortunately, the residence of Jefferson has to deal with that kind of problem. McLendon’s gun could symbolise the authority, threat of violence. And that is also one of the story’s main themes. People don’t really care about what is true or not, they’ve been lead by some bad values, which had been a consequence of racism. Ice manufacturing plant where Will works as a watchman, is a symbol of town’s needs. Jefferson is covered with dust, caused of sixty-two rainless days. Atmosphere is violent, always the same, nothing is being based on facts, and people get to face something new, rain maybe, some changes, hopes or innocence. This town is in a really bad condition; stale breathes, durn weather, flat and dead air with a metallic taste, haggard-looking people, and days die in a pall of dust. And then, McLendon’s house could be seen as symbol of hierarchy. Everyone is caged within the heat and dust. He hurts his wife, showing his authority, as he earlier had showed in the barbershop where he doesn’t want to discus the problem and will rather use violence to resolve it, and outdoors when he in some way punishes Will. When we are told that there are only four men in the car, and Butch was not on the running board, it seems like the narrator is talking. This might be important for the story, because, not all the facts are being representing by the characters themselves, but the narrator takes their places wisely, so we don’t even realise that. The intention could be that someone who wants to give us a message spotlights the whole Jefferson situation, and gives as the opportunity to see this situation from more perspectives. McLendon is maybe a man who is caged and can’t behave in own way just because of the people and habits, which were developed many many years ago in that area. So no one is capable of being different and think in different or correct way. Everything is based on rumors, which are swinging around the town, and everybody is looking into other’s lives. The gun at the end of the story could be a sign, which leads us to an open ending. Was Will killed by John and the other man or not, the question is now. But, as I mentioned before, we only have two choices; to conclude something based on facts, or just pretend that the truth is obvious and attempt to say that McLeadon has killed the poor Will. And is it right to call Will a ‘’poor’’ one? This shows us that people must not be motivated by prejudice, because nothing else is more correct than facts. There are more themes in this story I want to deal with, because all of them are relevant to the context of the Faulkner’s short story ‘’Dry September’’. William Faulkner’s ‘’Dry September’’ considers a problem still present in contemporary American society: crime and violence motivated by racism. What could be a difference between a good nigger and a bad one? Are they just saying that all the black people are bad, but Will is just an exception? That statement is describing that the community of Jefferson and the whole southern population is covered by racism. ‘’I know Will Mayes, he is a good nigger. ‘’(Part 1. aragraphs 2). This sentence is said by Henry Hawkshaw and shows us that he might think that Will is innocent, but that doesn’t mean that he is innocent of racist attitudes. He attempts to make a cooler atmosphere in his barbershop but refusing to agree with his fellows. And th at they really want to look after some trouble, can show us the quote in part 1 and paragraph 37: ‘’Are you going to let the black sons get away with it until one of them really does it? ’’ McLendon seems to think Will is innocent, but who cares, someone always got to be an example, and the poor Will is an unlucky one to be taken as a victim of a rumor. When taken away and put in the car, Will is speaking to them with some king of respect, and his addressing, ‘’captains’’ (part 3, p. 17) could refer to something higher, better and worthier. Is Will putting himself at the bottom of the hierarchy or is he forced to do that? That is just the consequence of the racism. The town is absent of black people when Minnie and her friends walk through it and this shows how terrified black population is. And racism’s mission is complete now. Denigrating language is also affecting the story, because this is showing us how low the black ones are concerned. Henry’s incomplete sentences can reflect his nervousness about his incompetence to communicate with the other men of the town. Two different ways of thinking can lead to a conflict of communication. Their abuse of language is also seen in many paragraphs. This may allude to what kind of population is acting in the story. So, the conclusion is that the provincial ones can’t fight the stupidity and what a feeling of racism brings with it. People are ruled by it, and don’t care about the consequences of bad things they have done. How can people sometimes be in a position of judging someone and first of all not knowing anything about that? ’That’s the one: see? The one in pink in the middle. ’’(Part 4, paragraph 3) And just because of that, people often choose to be lead by their individual opinions. They find it unacceptable to conclude something based on true facts. And that could be just because they are afraid of not having right on th at, because, then, their lives will maybe change, and they will be supposed to learn what tolerance and respect is, which is impossible. Those persons are mostly afraid, that’s why they put aggression in front of tolerance. And weakness is a perfect attribute, which easily can be owned by immorality and malevolence. There can we put Mr McLendon, because he is seen as a source of badness. He doesn’t care about the facts, ‘’Happen? What the hell difference does it make? ’’ Well, it makes. A bit more difference, because he expands a maybe wrong story, which can end in wrong way and hurt innocent people or make someone suffer. So, Minnie and Will are both judged cruelly by those people, and these judgements are based on irrational prejudices concerning race. Fortunately, the population in Jefferson isn’t so monochromatic. Already in paragraph 19 we meet the courageous barber who is making a first step in proposing a esearching of the problem. When Will swears to God that he hasn’t done anything wrong, people around him don’t care about that, because they don’t care about the case at all. The rumor was just a reason to kick a nigger and punish him, or as McLendon says, he doesn’t need to have a reason for kidnaping him. The black po pulation needs an example, and this is the perfect time to make it. It is hard to say why did Henry jumped from the car, but I will think that he had no more influence on them, he had done what it was in his capability, and he saw that as a finished job. The only way to save his own life was to escape, so he acted like a coward, refusing to help Will, which also shows us that he wasn’t so innocent in his racial attitudes. In this story, I don’t really see a clue of justice. The ‘’innocent’’ Will is punished, the ‘’poor’’ Minnie is physical and physical harmed. Is there any justice? I don’t think there is, and even if those events that happened at that Saturday night could be called as acceptable ones, so will the word justice never exist. And Minnie could also be taken as a person involved in a wrongdoing, because she could stand up and say the rumor is wrong understood, but she was acting like a victim. Conclusion would be that people are capable of doing terrible things just because of not knowing anything about the problem that pops up in our society. Instead, they let their weakness rule, and so they can’t even think or analyse the reasons of the problem. More and more are willing to choose the violence rather than tolerance, and history had showed us that the bad nature and value is spreading quicker than a good one.