3 Major Changes Happening in Retail in 5 Years

3 Major Changes Happening in Retail in 5 Years Are you currently employed in a retail position or looking to find one? If so, and you’re in it for the long haul, you can expect to encounter some big changes across the industry in the next several years. This is due to a variety of factors- from technological innovation that’s reshaping how consumers purchase products, to changes in the global economy and individual spending habits. 1. Basic Industry TrendsHere are some of the basic trends that are expected in retail over the next several years, according to the Bureau of Labor Statistics:Retail employment is projected to grow at a rate of 2 percent. This is slower than average, but opportunities will be available, largely due to the high employment turnover that’s characteristic of the industry.The greatest concentration of retail employment will be on the east and west coasts of the United States; the states with the highest employment levels will likely be California, Texas, Florida, New York, and Illinois. Places with the highest annual mean retail wages will likely be the District of Columbia, Washington, North Dakota, Rhode Island, and Connecticut.Industries with the highest levels of retail employment will likely be general merchandising stores, clothing stores, building supplies dealers, sporting goods and hobby shops, and car dealerships.2. Changes in Hiring ProceduresDo your memories regarding the retail positions you’ve held throughout your career involve walking into various stores, completing paper applications, and submitting it to an employee or manager? If so, then you can expect to notice a change in how hiring is done over the next few years. Expect the slow, old â€Å"paper and pen† application process, which often meant weeks of waiting for a response while mountains of applications were reviewed, to be replaced by a more computerized and efficient hiring process- from applying to onboarding and everything in between.Many of the components of hiring are b eing automated and shifting to computers, allowing for a faster turnaround time. Savvy and progressive-minded companies are realizing that satisfied and well-adjusted employees (from day one, when they’re still candidates) are crucial to their success, and are focusing on improving the â€Å"candidate experience,† which means making the hiring process as easy, transparent, and confusion-free as possible. Some are even embracing artificial intelligence (AI) tools to screen candidates and keep them updated throughout the hiring process faster and better than ever before. The ultimate goal here is for companies to attract and retain the best available talent to staff their teams, which will ultimately benefit their bottom lines and long-term success.3. Growth in E-CommerceThe shift in consumer purchasing and spending habits from brick and mortar stores to online shopping is undeniable- and has impacted every aspect of the retail sector, including job opportunities. As mor e people choose to shop online, expect to see less of a need for physical stores to connect with customers. As a result, we can expect to see a portion of the retail staffing needs of companies shift from in-store employment to online positions, including customer support, warehousing and inventory tasks, and more.Therefore, tech-savvy candidates with computer skills under their belts will likely have the best chances of obtaining the retail jobs of the future. If this sounds like you then you should be in good shape, but if your computer skills need some work then it might be a worthwhile investment to get them up to speed.There it is- a glimpse at some of the changes that you can expect to see in retail hiring and employment over the next 5 years. Use this information to help you prepare for the retail world of the future, and avoid any big surprises. Good luck!

Italian Verbs and Expressions Followed by Prepositions

Italian Verbs and Expressions Followed by Prepositions If youve learned how to conjugate Italian verbs, youll soon discover that theres another important part of the grammatical puzzle to master: what simple prepositions (preposizioni semplici) follow certain Italian verbs and expressions. In Italian, for example, there are certain verbs and expressions followed by a preposition such as a,  di, per, and su. Below are several tables that include Italian verbs and expressions followed by specific prepositions, as well as verbs followed directly by the infinitive. Italian Verbs and Expressions Followed by the Preposition A A. Before a Noun or Pronounassistere a- to attend​assomigliare a- to resemblecredere a- to believe indare noia a- to botherdar da mangiare a- to feeddare fastidio a- to botherdare retta a - to listen todare torto a - to blamedare la caccia a- to chasedare un calcio a- to kickdare un pugno a- to punchfare attenzione a- to pay attentionfare bene (male) a- to be good (bad)fare piacere a - to pleasefare vedere a- to showfare visita a- to visitfare un regalo a- to give a present togiocare a- to play a gameinteressarsi a- to be interested inpartecipare a- to participate inpensare a- to think aboutraccomandarsi a- to ask favors ofricordare a- to remindrinunciare a- to give upservire a- to be good forstringere la mano a- to shake hands with​tenere a- to care about B. Before an Infinitiveabituarsi a- to get used toaffrettarsi a- to hurryaiutare a- to helpcominciare a- to begincontinuare a- to continueconvincere a- to convincecostringere a- to compeldecidersi a- to make updivertirsi a- to have a good timefare meglio a- to be better offfare presto a- to do fastimparare a- to learnincoraggiare a- to encourageinsegnare a- to teachinvitare a- to invite tomandare a- to sendobbligare a- to obligepensare a- to think aboutpersuadere a- to convincepreparare a- to prepareprovare a- to try ones mindrinunciare a- to give upriprendere a- to resumerisucire a- to succeedsbrigarsi a- to hurryservire a- to be good for Verbs of Movement Aandare a- to gocorrere a- to runfermarsi a- to stoppassare a- to stop bystare a- to staytornare a- to returnvenire a- to come Italian Verbs and Expressions Followed by the Preposition Di A. Before a Noun or Pronounaccorgersi di- to notice, realizeavere bisgono di- to needavere paura di- to be afraiddimenticarsi di- to forgetfidarsi di- to trustinnamorarsi di- to fall in loveinteressarsi di- to be interested inlamentarsi di- to complainmeravigliarsi di- to be surprisednutrirsi di- to feed onoccuparsi di- to planpensare di- to have an opinion aboutpreoccuparsi di- to worry aboutricordarsi di- to rememberridere di- to laugh atsoffrire di- to suffer fromtrattare di- to deal withvivere di- to live on B. Before an Infinitiveaccettare di- to acceptammettere di- to admitaspettare di- to wait foraugurare di- to withavere bisogno di- to needcercare di- to trychiedere di- to askconfessare di- to confessconsigliare di- to advisecontare di- to plancredere di- to believedecidere di- to decidedimenticare di- to forgetdubitare di- to doubtfingere di- to pretendfinire di- to finishordinare di- to orderpensare di- to planpermettere di- to permitpregare di- to begproibire di- to prohibitpromettere di- to promiseproporre di- to proposeringraziare di- to thanksapere di- to knowsmettere di- to stopsperare di- to hopesuggerire di- to suggesttentare di- to attemptvietare di- to avoid Verbs Followed by the Preposition Su contare su- to count ongiurare su- to swear onreflettere su- to ponder onscommettere su- to bet on Verbs Followed Directly by the Infinitive amare- to lovedesiderare- to withdovere- to have to, mustfare- to makegradire- to appreciatelasciare- to let, allowpiacere- to likepotere- to be ablepreferire- to prefersapere- to know howvolere- to want Impersonal Verbs basta- it is enoughbisogna- it is necessarypare- it seems Note: These verbs may be followed directly by an infinitive.

Statistical Analysis of Microtitre Lab Data Assignment

Statistical Analysis of Microtitre Lab Data - Assignment Example In order to answer them you must have conducted the analysis and understood how to interpret the data and the statistical analysis. You may therefore refer to the proforma during the test. Graphs should be constructed in Excel and sized to fit the allotted space. The aim of this assignment is for you to demonstrate the ability to conduct a statistical analysis on a set of data and report the findings in a scientific manner. You should use SPSS for the ANOVA. 1. Construct a calibration curve using all of the data provided (i.e. all replicates for each concentration NOT the mean absorbance values). You must conduct Linear Regression Analysis using Excel and provide the R2 value and the equation of the line of best fit (y=mx +c, where y represents absorbance, x is the concentration of protein, m is the slope of the line of best fit and c is the intercept of the line on the y-axis). 2. Refer to the quality control data set on the Excel spreadsheet, below the calibration curve data. Using the values of the equation of the line of best fit from the calibration curve, take each absorbance value for the quality control data and calculate the concentration of protein for each replicate. You should then calculate the mean, standard deviation and coefficient of variation (see notes from Statistics Lecture 1) for each concentration and insert them into Table 1: As the absorbance values of the data are beyond the range of the calibration curve, you will only conduct your analysis on the absorbance values to determine whether each of the detergents has an effect upon the absorbance produced for a set concentration of protein (0.5mg/cm3)). From the above table (ANOVA table), we observe p-value=0.000

Corporate Responsibility & Governance Assignment - 1

Corporate Responsibility & Governance - Assignment Example Wealth creation is not the sole objective that firms should pursue rather they are obliged to other goals that are aimed at ensuring the enterprise gives back to the society that has been supporting it through its journey to success (Aras, & Crowther, 2012). Corporate governance, on the other hand, is the mechanisms that stakeholders of a business utilise to conduct internal control of the affairs of the organisation so as to ensure their interests are well safeguarded. Corporate governance is frequently premised by two circumstances the first one if through the agency problem or rather a conflict of interests between various parties that necessitated for an oversight role to be implemented by the stakeholders. Additionally, if the transaction costs are too high or rather are in such a manner that the agency problem cannot be adequately solved then corporate governance will be necessary to safeguard the interests of the company’s stakeholders (Simpson and Taylor, 2013). Coca Cola is a global organisation that conducts its operations in numerous countries across the world. For the purpose of this report, we are going to focus on the Coca Cola International in India on how it conducts its corporate governance. Since it is an international organisation Coca-Cola implements a rather similar corporate governance mechanism for all its affiliate companies in all countries with slight modifications to fit the regulatory requirements for the individual nations where the company is conducting its operations. The company has governance codes that guide them in the presentation of their corporate report. The code addresses a number of issues that are going to be elaborated as follows. To begin with corporate governance is all about internal control; that duty is bestowed on the directors of the company. The corporate governance code of Coca-Cola addresses the roles and duties of

Short story Essay Example | Topics and Well Written Essays - 500 words

Short story - Essay Example Angelina was a lucky girl to have her. Angelina was only two years old when the accident happened. Mrs. Kevin was a mother as well as a father for Angelina. However, this fact cannot be negated that every person has a separate place in his life. Angelina, in spite of her mother’s overly care and love, missed her father a lot and tried to find fatherly association with the colleagues and friends of her mother. When she was a child, she used to closely look at the bondage of her friends’ fathers to their daughters in order to understand their relationships with their daughters. After looking at their relationships, she used to come to her mother and ask about her father. As an orphaned child, she always missed her father. This continuous deficiency made her an introvert due to which, people used to consider her as a shy girl. She got threatened and depressed soon as compared to other girls of her age. She was quite talented but whenever, she was required to face people, she always backed off. One day, she came to her mother and said, From the next day, Angelina started getting ready for the play. She took part in rehearsals and was really liked by the teachers. However, according to some of the teachers, she lacked confidence and for acting on stage, it was essential. Mrs. Elizabeth encouraged her to act and speak confidently. At last, the day came, when she was required to act on stage. When she appeared on stage as Desdemona, she at once got depressed seeing the audience. Her mother was also a part of the audience who clapped for her appearance on stage. Angelina was unable to speak a single dialogue and stayed in a trance for some time. She was taken back stage for two to three minutes where her teacher talked to her and convinced her to act. When she gave her second appearance, she started delivering her dialogues with such eloquence and confidence that everyone in the audience was amazed and appreciated her. Her mother was also proud of her.

Polyester: History, Development and Applications

Polyester: History, Development and Applications ABSTRACT:Â   Polyester is a synthetic fiber derived from coal, air, water, and petroleum. Polyester fibers are formed from a chemical reaction between an acid and alcohol, and is developed in a 20th-century laboratory. In the formation of polyester reaction, two or more molecules combine to make a large molecule whose structure repeats throughout its length. Polyester fibers can form very long molecules that are very stable and strong. Polyester has been considered to have several advantages over traditional fabrics such as cotton. One of its most important quality is that it does not absorb moisture, but does absorb oil; this quality makes polyester the perfect fabric for the application of water-, soil-, and fire-resistant finishes. Its another quality, that is, low absorbency also makes it naturally resistant to stains. Polyester is used in the manufacture of many products, including clothing, home furnishings, industrial fabrics, computer and recording tapes, and electrical insulation. As we go along further, we would see the various uses of polyester in all the several fields such as clothing, furnishing, etc. Fabrics woven from polyester thread or yarn are used extensively in apparel and home furnishings, from shirts and pants to jackets and hats, bed sheets, blankets and upholstered furniture. Industrial polyester fibers, yarns and ropes are used in tire reinforcements, fabrics for conveyor belts, safety belts, coated fabrics and plastic reinforcements with high-energy absorption. Polyester fiber is used as cushioning and insulating material in pillows, comforters and upholstery padding. We would discuss in detail the history of polyester, the method of manufacturing of polyester, its various uses, and its importance in our day to day life, how much we use polyester in our life without really noticing that it is polyester we are using. INTRODUCTION: In short we can say that polyester is a category of polymers which contain the ester functional group in their main chain. Even though there are many types of polyester, the term polyester as a specific material most commonly refers to polyethylene terephthalate (PET). Polyesters include naturally-occurring chemicals. Naturally occurring chemicals include that are found in nature and are not man-made such as in the cut in of plant cuticles. An example of synthetic fiber is synthetics through step-growth polymerization such as polycarbonate and polybutyrate. Generally natural polyesters and even a few synthetic ones are biodegradable, that is, they can break down or decay naturally without any special treatment, and can therefore be thrown away without causing pollution. Whereas on the other hand, most synthetic polyesters, which are more commonly used, are not biodegradable. Polyester is a term often defined as long-chain polymers chemically composed of at least 85% by weight of an ester and a dihydric alcohol and a terephthalic acid. In simpler terms, it means that polyester is the linking of several esters within the fibers. Reaction of alcohol with carboxylic acid results in the formation of esters. Polyester also refers to the various polymers in which the backbones are formed by the esterification condensation of polyfunctional alcohols and acids. Polyester can also be classified as saturated and unsaturated polyesters. Saturated polyesters refer to that family of polyesters in which the polyester backbones are saturated. They are thus not as reactive as unsaturated polyesters. The saturated polyesters consist of low molecular weight liquids used as plasticizers and as reactants in forming urethane polymers, and linear, high molecular weight thermoplastics such as polyethylene terephthalate (Dacron and Mylar). Usual reactants for the saturated polyesters are a glycol and an acid or anhydride. Unsaturated polyesters refer to that family of polyesters in which the backbone consists of alkyl thermosetting resins characterized by vinyl unsaturation. They are mostly used in reinforced plastics. These are the most widely used and economical family of resins. Characteristics of polyester Polyester fabrics and fibers are extremely strong and thus durable. Polyester is very durable: it is resistant to most chemicals, stretching and shrinking, wrinkle resistant, mildew and abrasion resistant. Polyester is hydrophobic in nature, that is, these molecules and quick drying. It can be used for insulation by manufacturing hollow fibers. Polyesters quality to retain its shape is good for making outdoor clothing for harsh climates. Polyester can be easily washed and dried, without the added tension of ironing and all because it does not form wrinkles. HISTORY OF POLYESTER: Polyester became famous for Scrunch it, pull it, and wash it without any wear and wrinkles. Polyester was the fabric of choice in an economy that was changing in terms of speed, efficiency and convenience. The textile industrys answer to food industry producing fries and coke was the production of Polyester quick, cheap and easy. Carothers Work It was W.H.Carothers who discovered that alcohols and carboxyl acids could be successfully mixed to create fibers. Carothers was working for DuPont at the time and unfortunately when he discovered Nylon, polyester took a back seat. PET Terylene The incomplete research of Carothers had not advanced to investigating the polyester formed from mixing ethylene glycol and terephthalic acid. Whinfield and Dickson 2 British scientists are the ones who patented PET or PETE in 1941. Polyethylene terephthalate (PET) forms the basis for synthetic fibers like Dacron, Terylene and polyester. Later that year, the first polyester fiber Terylene was created by Whinfield and Dickson along with Birtwhistle and Ritchiethey. Terylene was first manufactured by Imperial Chemical Industries or ICI. DuPonts Role It was in 1946 that DuPont bought all legal rights from ICI, that is, Imperial Chemical Industries. In 1950, the Dealware property of DuPont manufactured another polyester fiber, which they named Dacron. Mylar was introduced in 1952. Polyester was first introduced to the American public in 1951 as the magical fabric that needed no ironing! PET and PEN are DuPont trademarks that have turned the use and consumption of Polyester around. Polyester Becomes Popular Subsequent to the development of Terylene and Dacron, Kodel was developed by Eastman Chemical Products, Inc in 1958. The polyester market underwent rapid expansion and textile mills emerged everywhere. Many of the mills were located at small gas stations and produced cheap polyester apparel. The inexpensive and durable fiber became very popular and the industry expanded rapidly till the 1970s. Unfortunately, the infamous double-knit polyester image hit the industry and polyester soon came to be known as the uncomfortable fabric. The Phoenix Rises Today, polyester is largely regarded as a cheap fabric that is rather uncomfortable for sensitive human skin to wear. It is also not preferred because of its highly inflammable properties. However, the emergence of luxury fibers like polyester microfiber and various polyester blends, the polyester industry is once again on its way to a grand come back. The Tennessee Eastman Company and the Man-Made Fiber Producers Associations (MMFPA) Polyester Fashion Council played a significant role in the revival of polyester. The Tennessee Eastman Company started a YES campaign for polYESter and popularized it via radio and television. The main idea was to focus on the wash and go properties of polyester rather than sell it as a cheap fabric. Hoechst Fibers Industries also played a part in the history of polyester. They conducted various studies from 1981 to 1983 and found that 89% of people could not distinguish between polyester and other natural fibers like cotton, wool and silk. Also, it was found that people were more interested in the appearance of the apparel than the fabric it was made of. Today, the biggest contributor to the appeal of polyester is the discovery of microfibers. Microfibers give polyester the feel of silk and are rapidly becoming the choice of fabric. With an expensive tag to match, the cheap image of polyester seems to be on its way out. Heres to heralding a new era in the history of polyester! MANUFACTURING OF POLYESTER: Polyester Manufacturing Polyester fibers or the synthetic fibers are long chain polymers which are derived from coal, air, water, and petroleum. They are formed through chemical reaction between an acid and alcohol, which forms ester. In this reaction, two or more molecules combine to make a large molecule whose structure repeats throughout its length. These molecules are very stable and strong. There are variations in the compositions and therefore in the properties of polyester fibers. Types of Polyester PHYPERLINK http://www.teonline.com/fibers-yarns-threads/polyester-fiber.htmlolyester fibers are generally available in two varieties- PET (polyethylene terephthalate) and PCDT (poly-1, 4-cyclohexylene-dimethylene terephthalate). PET is the most common production of polyester. It is stronger than PCDT, while PCDT has more elasticity and resilience. Another advantage of PET is that it can be used alone or blended with other fabrics for making wrinkle free and stain resistant clothing that can retain its shape. PCDT is more suitable for heavier applications. These heavier applications include draperies and furniture coverings. Modifications can be introduced in each of these varieties for obtaining specific properties. Raw Materials Polyester is a chemical term which can be broken into poly, meaning many, and ester, a basic organic chemical compound. The principle ingredient used in the manufacture of polyester is ethylene, which is derived from petroleum. In this process, ethylene is the polymer, the chemical building block of polyester, and the chemical process that produces the finished polyester is called polymerization. PET Polyester For manufacturing PET Polyester, the main raw material is ethylene derived from petroleum. This ethylene is oxidized to produce a glycol monomer dihydric alcohol which is further combined with another monomer, terephthalic acid at a high temperature in a vacuum. Polymerization, the chemical process that produces the finished polyester, is done with the help of catalysts. Catalysts are used to speed up the rate of a reaction. Then a colorless molten polyester is formed which then flows from a slot in a vessel on to a casting wheel and takes shape of a ribbon as it cools to hardness. The polymer thus produced by this process is then cut into very small chips, dried to remove all moisture and blended to make it uniform for getting it ready for spinning into yarn. PCDT Polyester This variation of polyester is made by condensing terephthalic acid with 1, 4-cyclohexane-dimethanol to form poly-1, 4-cyclohexylene-dimethylene terephthalate or the PCDT Polyester. As for PET Polyester, PCDT is processed for melt spinning. Spinning Polymer chips are melted at 500-518ÂÂ °F (260-270ÂÂ °C) to form a syrup-like solution. The polymer, which is now in a molten form, is then extruded through a spinneret and the filaments are subsequently drawn into the desired polyester fiber. Variations are introduced to obtain desired end results. Spinnerets having hole of different shapes such as round, trilobal, pentalobal, hexalobal or octalobal can be used for special effects like opacity, luster or its suppression, wicking, comfort or feel. Hollow fibers may be produced to make it lightweight and for providing greater cushioning or insulative properties. Crepe effect can be obtained through crimps. Certain additives may also be combined with the spinning solutions for specific properties. Delusterant can be added to make the fiber dull, a flame retardant may be added or certain other antistatic substance may also be included. The product stream divides into two different application areas which are mainly textile applications and packaging applications, after the first stage of polymer production in the melt phase. In the table shown below, the main applications of textile and packaging polyester are listed. Textile Packaging Staple fiber (PSF) Bottles for CSD, Water, Beer, Juice, Detergents Filaments POY, DTY, FDY A-PET Film Technical yarn and tire cord Thermoforming Non-woven and spun bond BO-PET Biaxial oriented Film Mono-filament Strapping Abbreviations: PSF = Polyester Staple Fiber; POY = Partially Oriented Yarn; DTY = Draw Textured Yarn; FDY = Fully Drawn Yarn; CSD = Carbonated Soft Drink; A-PET = Amorphous Polyester Film; BO-PET = Biaxial Oriented Polyester Film; Drawing After extrusion from the spinneret, the fibers are drawn or elongated, with the help of godet wheels. The polyester fibers are usually drawn up to five times its original length, depending upon the desired properties. The filaments are drawn to a greater extent, for higher tenacity. When the fibers come in contact with the air, they solidify. Generally, the PET fibers are drawn hot as it produces more uniform fibers. PCDT fibers are drawn at higher temperature because of their higher melting point. During the drawing process itself, fibers may be textured which saves time, efforts and production cost and also gives greater quality control over the finished fibers. After the polyester yarn is drawn, it is wound on large bobbins or flat-wound packages, ready to be woven into material. Types of Polyester Yarns Polyester yarns have a wide range of diameters and staple lengths. The yarns are made basically as monofilament yarns, multifilament yarns and spun yarns. Filament Yarns PET Polyester is used to make filament yarns either in monofilament or multifilament forms. The direction and amount of twists are decided by the desired end use. The properties are also pre-determined. There are various types of such yarns. There is the bright, regular tenacity polyester yarn having light, stretch and sag resistance, used for sheer lightweight fabrics like tulle, voile and organdy. The regular tenacity semi dull yarn used for various apparels including lingerie. Its duller version is used for shirts and blouses. Polyester yarns resistant to various chemicals, and micro organisms are produced from high tenacity fibers for such industrial uses as conveyor belts, ropes and nets etc. Textured Yarns These yarns are made of PET multifilaments. Texturizing is either done along with the drawing process or afterwards during throwing or texturizing process. Spun Yarns Spun yarns are made of staple or cut PET or PCDT polyester fibers. The staple may be bright, semi dull or dull and tenacity may be regular, mid or high. It may be polished to reduce crimp and increase luster. It may either be spun alone or blended with other staple such as cotton, wool or rayon and then spun into yarn. Manufacturing Staple Fiber In making polyester staple fiber, polymerization, drying, and melt spinning are much the same as in the manufacture of filament yarn. However, in the melt spinning process, the spinneret has many more holes when the product is staple fiber. The rope-like bundles of polyester that emerge are called tow. Drawing tow * 1: Newly-formed tow is quickly cooled in cans that gather the thick fibers. Several lengths of tow are gathered and then drawn on heated rollers to three or four times their original length. Crimping * 2: Drawn tow is then fed into compression boxes, which force the fibers to fold like an accordion, at a rate of 9-15 crimps per inch (3-6 per cm). This process helps the fiber hold together during the later manufacturing stages. Setting *3: After the tow is crimped, it is heated at 212-302ÂÂ °F (100-150ÂÂ °C) to completely dry the fibers and set the crimp. Some of the crimp will unavoidably be pulled out of the fibers during the following processes. Cutting * 4: Following heat setting, tow is cut into shorter lengths. Polyester that will be blended with cotton is cut in 1.25-1.50 inch (3.2-3.8 cm) pieces; for rayon blends, 2 inch (5 cm) lengths are cut. For heavier fabrics, such as carpet, polyester filaments are cut into 6 inch (15 cm) lengths. Synthesis Synthesis of polyesters is generally achieved by a polycondensation reaction. See condensation reactions in polymer chemistry. The General equation for the reaction of a diol with a diacid is: (n+1) R (OH) 2 + n RÂÂ ´ (COOH) 2 > HO [ROOCRÂÂ ´COO] n ROH + 2n H2O Azeotrope esterification In this classical method, an alcohol and a carboxylic acid react to form a carboxylic ester. To assemble a polymer, the water formed by the reaction must be continually removed by azeotrope distillation. Acylation (HCl method) The acid begins as an acid chloride, and thus the polycondensation proceeds with emission of hydrochloric acid (HCl) instead of water. This method can be carried out in solution or as an enamel. Silyl method In this variant of the HCl method, the carboxylic acid chloride is converted with the trimethyl silyl ether of the alcohol component and production of trimethyl silyl chloride is obtained Acetate method (esterification) Silyl acetate method Ring-opening polymerization Aliphatic polyesters can be assembled from lactones under very mild conditions, catalyzed anionically, cationically or metallorganically. Cross-linking Unsaturated polyesters are thermosetting resins. They are generally copolymers prepared by polymerizing one or more diol with saturated and unsaturated dicarboxylic acids (maleic acid, fumaric acid) or their anhydrides. The double bond of unsaturated polyesters reacts with a vinyl monomer mainly the styrene, resulting in a 3-D cross-linked structure. This structure acts as a thermoset. The cross-linking is initiated through an exothermic reaction involving an organic peroxide, such as methyl ethyl ketone peroxide or benzoyl peroxide. APPLICATION OF POLYESTER: Polyester is used in manufacturing of many products, such as clothing, home furnishings, industrial fabrics, computer, recording tapes, and electrical insulation. It has several advantages over traditional fabrics as it does not absorb moisture. Its low absorbency also makes it naturally resistant to stains. Polyester clothing can be preshrunk in the finishing process. This makes it resist shrinking and it doesnt stretch out of shape. The fabric can be dyed easily, and is mildew resistant too. Textured polyester fibers are an effective, nonallergenic insulator, thus it is used for filling pillows, quilting, outerwear, and sleeping bags. Because of their many desirable qualities, polyester fibers and fabrics have many uses. Polyester is often used in outerwear because of its high tenacity and durability. It is a strong fiber and consequently can withstand strong and repetitive movements. Its hydrophobic property makes it ideal for garments and jackets that are to be used in wet or damp environmentscoating the fabric with a water-resistant finish intensifies this effect. Many jackets and quilted garments are made of polyester. Since polyester can be molded into almost any shape, certain insulating properties can be built-in to the fiber. One method is to create hollow fibers: This process traps air inside the fiber which is then heated by the body. The warm air stays inside and helps warm the body in cool weather. A second method is to use crimped polyester in a fiberfill. The crimp helps keep in warm air. Polyester is an ideal fiber to use for this since it will retain its shape, unlike its cotton and wool counterparts that tend to flatten out over time, significantly reducing their ability to trap warm air. Polyester is often used in pants, shirts, suits, and bed sheets either by itself or as a blend, because of its wrinkle-resistant property and its ability to retain its shape. Since these garments are frequently worn and washed, its stain-resistancy and durability are also desirable. Polyester also has industrial uses as well, such as carpets, filters, synthetic artery replacements, ropes, and films. The pie chart below, taken from Fiber Science by Kathryn L. Hatch, summarizes many of polyesters uses: When the world thinks of plastic films, it thinks of PET. Packaging Applications Polyester film is used in many types of packaging applications ranging from food and drugs to industrial and consumer goods. As plain or metalized, formable, heat-shrinkable and/or coated for barrier, metal adhesion, laminating adhesion, extrusion coating adhesion, printing or sealing, PET film offers excellent characteristics for the packaging market easy machinability, strength, high- and low-temperature resistance, crystal clarity, and printability. The properties that make PET film ideal for packaging applications include: High strength for high speed processes, higher tensions, and higher temperatures Chemical surface treatment during manufacturing or post-manufacturing to enhance characteristics, such as barrier, adhesion, printability, metal adhesion, and release High clarity Strength and resistance to tear Dimensional stability over a very wide range of temperatures and humidity Resistance to attack by moisture and most common solvents Excellent barrier to both oxygen and water vapor to extend shelf- life. Applications Flexible packaging PET film is an excellent laminating substrate for flexible packaging structures, i.e. stand-up pouches, offering excellent flex and puncture resistance. Lidding PET film maintains its strength at both, freezer and oven temperatures, for leak-resistant wraps, lidding, and peelable seals in a wide range of food and nonfood applications. Can laminations Co polyester film is laminated to metal for can applications. Metallized packaging Metallized PET film is used for high barrier, decoration, and embossed holographic applications. Susceptors lightly Metallized PET film is used in microwave Susceptors constructions for browning and cooking food in microwave ovens. Imaging The unique combination of optical, physical, thermal, and chemical properties of polyester film has made it the film of choice for many imaging applications. Some of the major applications include x-ray, photographic, printing, microfilm, photoresist/phototool, overhead projection transparencies, and drafting/reprographics. Currently, these applications account for about 30% of the total PET film consumption. Recent developments in electronic imaging may cause some decline in the use of PET film in some of these applications, but the impact is not expected to be very significant in the near future. The properties that make PET film ideal are its: Brilliantly clear nature Very smooth and glossy surface Ability to: be translucent, opaque, or colored (with suitable additives) have a desired rough or matt finish (with filler additives or coatings) be chemically surface treated during manufacture to enhance adhesion to subsequent coatings Strength and resistance to tear Excellent flatness (freedom from curl and cannot be creased easily) Dimensional stability over a very wide range of temperatures and humidity Resistance to attack by moisture (or most of the common solvents) Non-aging characteristics Shelf life (can be stored for a long time) Applications X-Ray Out of the total PET film usage for imaging applications, more than 30% goes into x-ray base. Typically, a blue-tinted 175 micron PET film is coated with a gelatin-based photosensitive coating and is used as medical x-ray film. Photographic Generally, 100 micron and 175 micron PET film is coated with silver-sensitized layers for photographic applications mainly in professional photographic films and instant photographic applications. Printing PET film is used for printing applications such as in layout, masking, pre-press proofing, plate mounting, and photopolymer plates. PET film is also widely used as a base to print on for displays, signage, posters, labels, etc. Microfilm Originals and duplicates of micro-images of documents, records, drawings, etc., are produced on suitably coated PET film for easy storage, space saving, and retrieval. Photoresist Phototool PET film is used in the plating or etching processes for production of rigid and flexible printed circuits. Overhead Projection Transparencies Coated PET film is used for making overhead projection transparencies in plain paper copying machines. Overhead projection transparencies can be printed by other techniques and written on, as well. Drafting Reprographic PET base film is coated with matt or diazo-sensitized or silver-sensitized lacquers, and is widely used for drafting and in the duplication of engineering drawings. This drawing office film is considered to be more convenient for making subsequent changes in designs, and it can also be used for storage. Industrial Specialty Applications Polyester films thermal, chemical, and dimensional stability coupled with its high tensile strength, durability, flex resistance, and clarity promote broad utilization in Industrial and Specialty applications. Polyester film can be produced in a wide range of thickness (from one to several hundred microns) and visible light transmission from essentially 0% to 99+%. Polyester films ability to be customized through both polymer and surface modification to fit the specific application adds to its versatility and value as a film of choice. Key properties of PET: Dimensional stability, both thermal and moisture Chemical and solvent resistant Strength, tear, and flexual resistance Broad light transmission: optically clear to opaque Surface treatable for adhesion to a variety of materials Broad thickness availability Printable surfaces Few, if any, flexible films available today provide the broad array of performance properties for use in the Industrial and Specialty application market. PET film provides exceptional value in a wide variety of applications. Electrical Applications Polyester film itself is used as electrical insulation. It is also used as a laminate with other substrates, such as non-woven polyester matt (DMD), and organic and inorganic papers, such as aramid paper, silica paper, and mica paper. Polyester film can be used in UL registered electrical systems rated as high as Class F (155ÂÂ °C). Laminates can be used in systems rated as high as Class R (220ÂÂ °C). In motor applications, polyester film is used for ground insulation as slot liners and wedges, as well as phase insulation. The high electrical breakdown voltage, coupled with polyester films high resistance to degradation, makes it ideal for mechanical barriers in wire and cable applications. In transformer and high-voltage distribution equipment applications, polyester film is used to wrap the conductors. Polyester film, with lower extractable content, is effective for use in hermetic applications, such as refrigerator and air conditioner motor/compressor assemblies. PEN polyester film is used where higher temperature performance is required, either in the fabrication stage or in the end-use operating conditions. Thin polyester films (two micron and below) are an integral component of capacitors, where polyesters high dielectric constant and its physical properties enable the component design to be optimized and miniaturized. The physical properties of polyester film (such as dimensional stability, thermal stability at elevated temperatures, and coefficient of friction) combined with its mechanical properties (such as tensile break strength, tensile yield strength, and elongation at break) and its chemical and electrical resistance; make it the preferred material for a wide variety of electrical insulation applications. Magnetics Polyester film is used in a variety of magnetic media, including video, camcorder and audio tapes, and data storage applications such as floppy disks and computer tapes. For all magnetics applications, the base film is further coated with a magnetically receptive coating layer. Polyester film has the excellent dimensional stability required to ensure that the heavy coating layer does not distort and faithfully records the images, sound, or data. The largest volumes of PET film for the magnetic market sector are consumed at present in conventional video and audio tapes. Once again, the dimensional stability of polyester, plus the ability to have a magnetic coating layer adhere to the film, are key to these new applications, which are reaching exceptionally high information densities with corresponding reductions in size and faster data access times. The dynamic nature of this market segment, with new applications growing as others mature, is typical of the innovation that exists in the polyester film industry. Use of polyester in garments Polyester is used in the manufacturing of all kinds of clothes and home furnishings like bedspreads, sheets, pillows, furniture, carpets and even curtains. The disco clothing of the 70s with all its jazz and flash was made of polyester. Hydrophobic nature: High tenacity and good durability makes polyester the choice of fabric for high stress outdoors use. Polyester is also a strong fiber that is hydrophobic in nature. It is thus ideal for clothing to be used in wet and damp environments. The fabric is also coated with a water-resistant finish and further intensifies the hydrophobic nature. Being the most heavily recycled polymer worldwide, it is also used by climbers. Climbing suits, parkas, sleeping bags and other outdoor gear are using the new insulating polyester fiberfill products. One can also do winter windsurfing wearing dry suits lined with polyester fleece. Creating insulation: By creating hollow fibers it is also possible to build insulation into the polyester fiber. Air is trapped inside the fiber, which is then warmed by the heat of the body. This keeps the body warm in cold weather. Another method to build insulation is to use crimped polyester in a fiberfill. The crimp helps keep the warm air in. Polyester is an ideal fabric for this kind of insulation because it retains its shape. Cotton and wool tend to flatten over a period of time and loose the warming effect. Wrinkle resistant: Polyester is also wrinkle resistant and is used very often in everyday clothing like pants, shirts, tops, skirts and suits. Used either by itself or as a blend, it is also stain resistant and hence very popular. Polyester care tips Taking care of polyester clothing is really easy and very time efficient. Polyester clothing can be machine washed and dried. Adding a fabric softener generally helps Dry the fabric at low temperatures to get maximum usage from the clothing. Though polyester does not require much ironing, if

walmart :: essays research papers

Wal-Mart’s everyday low prices gives an edge over other retailers. †¢ Efficient IT infrastructure enables to smoothen inbound and outbound logistics. †¢ Distribution efficiencies reduces the dependency on the suppliers inefficiencies. †¢ Wide range of products provides customer anything and everything under one roof. †¢ Current dominating market position gives advantage in market development and penetration. †¢ economies of scale of scale Weaknesses- †¢ The weakness is that their overhead is expensive to run store facilities all over the world. †¢ Hierarchical corporate structure may impair decision-making. †¢ In an attempt to succeed by means of low prices, may possibly portray Walmart as a cheap store. †¢ Market maturing †¢ Concentration in a low margin industry †¢ †¢ Zoning issues are the store real estate problems. Just because a company has the ability to build a huge store anywhere it wants to, it does not necessarily mean that it is possible to build one anywhere it wants to. The real estate issue becomes more evident in crowded cities such as Japan where there is a major concern over the availability of real estate. Opportunities †¢ Expansion into emerging International markets †¢ Societal trend towards environmental friendly and American –made products †¢ Move toward value for money products in the slower economic growth Threats- †¢ Even though Wal-Mart is the largest retailer and most successful, they can still be threatened by many factors ranging from their main competitors, environmental, and economic factors. †¢ In many places in USA, Wal-Mart has faced the Anti Wal-Mart activists. According to them having Wal-Mart in the neighborhood kills the local retailers, increases the property taxes to pay for sewage, roads, utilities, and sidewalks. †¢ Regulations and political stability in the international markets †¢ Exchange rate fluctuations †¢ A union problem for ex.Germany has one of the highest degrees of unions and this has a profound effect on hiring, retaining, and laying off employees. Once an employee is hired, it costs more in Germany to keep the employee on payroll and to lay off the employee. German workers are one of the highest paid workers in the world. †¢ Capital intensive for expansion †¢ Challenges The main challenge for Walmart in the years to come is to make sure they continue to keep their customer’s and associates satisfied. In addition, to be a profitable corporation for their investors who own stock in Walmart.