Essays on Polyethylene

Abstract

Several experts have been concern about the effectiveness of recycling in mitigating the effects of pollution and global warming. Some even argued that the recycling process is economically and environmentally ineffective due to the large costs and large amounts of energy required for the process. However, the practice of recycling should be continued and improved since it has numerous potential benefits against its alternatives. First, recycling is not a waste of money since the alternatives to this strategy such as incineration and landfilling has larger costs due to environmental damages. Second, issues and problems associated with recycling could be ...

Abstract

A sandstorm is characterized as one that whips up extraordinary loads of sand into the air, forming a dense cloud above the ground in the process. While most of the sand will rise higher than 50 cm, some sand particles can even ascend to the height of 2 meters. According to Wikipedia, the average diameter of the particles carried by such dust storm winds will vary between 0.15 and 0.30 mm. Wind speeds such during sandstorms have been recorded at up to 16 km per hour and more, while most storms continue to blow for between three hours to ...

Overview: Overview: Antigen-antibody reactions are commonly used in immunological assays. In a traditional agglutination assay, the end product is a visible antibody-antigen complex that settles as visible particulate matter in the solution. In other cases, the reaction is invisible and wants the use of a specific enzyme or isotopic probes that can amplify the signal created by the antigen-antibody reaction, so that they can be detected with the naked eye or an ELISA/RIA reader1. Hemagglutination is a visible antigen -antibody assay in which soluble antibodies react with antigen on the surface of (red blood cell) RBC to form a ...

Many Americans today prefer to use plastic bags rather than paper bags, which tend to be more expensive and cannot be re-used. People are unaware that it costs less to produce new plastic bags than to recycle them. First and foremost, less than one percent of plastic bags is recycled, so eventually the other ninety-nine percent of bags litter our environment. Those bags are made of polyethylene, they are very lightweight and aerodynamic, that is why they can be easily picked up by the wind and carried through pipes and sewage pipes. That is how plastic bags are making ...

Introduction

Improper handling of food products and lack of proper personal hygiene by food handlers are some of the leading factors that cause outbreaks of food borne diseases. Essentially, microbes’ attack, which is responsible for the highest number of food borne illnesses, gets transmitted when the food handlers fail to clean their hand (Michaels, 2001). As a result, gloves have become an integral part of the culinary industry. In fact, according to food safety regulation, wearing gloves has been termed as a mandatory requirement in both food preparation and food handling services (Farquhar & Tassin, 2016). Gloves for use by food ...

A conductive cable is a wire or a group of wires that conducts electricity. Substances which do not allow the passage of current through them are known as insulators. An insulating material should possess a very good dielectric strength and fire proofing qualities. In addition to good mechanical strength, it should have high chemical inertness. Often the most suitable insulation for resisting dielectric stress may not have an outer surface that is suitable for the conditions which the cable must meet. Thus, for improvement in resistance to flame, oil, abrasion, and chemical environment, a suitable jacket is extruded around the insulated conductor. ...

This article explains that bottle water can cause cancer. According to this article leaving bottle water in hot vehicles causes the bottles to release carcinogenic substances. The author of this article is highly critical of this causation. He argues that this argument is based on a research paper presented by a student from the University of the Idaho. Ed Zimney, the author of this article, explains that the results used in this research were unsubstantiated. He adds that this research is based on assumption that has been extrapolated by the media to cause a stir within the public about the issue (Zimney, ...

Bottled water is the world's fastest growing beverage, but customers prefer turning on the tap. Water Bottlers generally take advantage of consumer concerns regarding municipal water supplies, hence increasing demand for their product. A number of bottled waters, nonetheless, differ from tap water simply because it is distributed by bottles rather than through pipes (Mark, 2012) Tap and Bottled water come from basically the same sources: springs, aquifers and lakes, to list a few. Actually, a considerable fraction of the bottled water products on store shelves are tap water although treated and filtered with extra steps to perk up taste ( ...

Introduction

Polymerization could be considered to be perhaps the main chemical reaction associated with modern living. It is a reaction that is common in nature for the formation of “biopolymers” such as celluloses and proteins. It can also be thought of as the fundamental reaction type for the formation of DNA, making polymerization essential for life as it exists on this planet. In general terms, polymerization is a reaction process in which the molecules of an appropriate material, termed the 'monomer', become bonded together to form a much larger linear chain or a three-dimensional network. A polymer is thus a material that consists of very ...

Forewords

The term recycling refers to the process of changing waste materials into usable, new products, thus, preventing the wastage of useful materials. It leads to the reduction in the consumption of fresh raw materials, usage of energy, water pollution, and air pollution. It obviates the need for conventional waste disposal, and the greenhouse gas emission is far less than fresh production of the product. There are several materials and wastes that can be recycled including plastics and others. Modern waste management includes recycling as a key component and is the third aspect of waste management hierarchy which includes Reduce, Reuse, ...

Body armor, not a new phenomenon, has been progressively used by security and military forces to mitigate serious injuries during their professional activities. Soft body armor and hard body armor design became more effective against projectiles and stabbing, and light in weight for the comfort of wearers’ activities. Originally developed by the Japanese, soft body armor is constructed of woven or ballistic resistant fabrics and can surpass 30 layers. In 1970s, the manufacture of Kevlar® was sponsored by the National Institute of Justice. Modern hard body armor is much lighter and effective since it has a large amount of new generation ...

The question of paper versus plastic bags has long weighed on the environmentally-conscious. Determining what type of bag to use-- which type causes the least damage to the environment-- is a question whose answer could potentially change the way the world works. However, until relatively recently, the question of paper versus plastic remained unresolved. Through an analysis of paper and plastic bags, however, it can be seen that there are indeed benefits to using one over the other. To consider which type of bag is better for the environment, careful consideration regarding the manufacture, transportation, longevity, reuse, and disposal of ...

Q1:

There are four classes/or types of materials that are considered as listed below

- Ceramics and Glasses - Composite materials - Polymers - Metal alloys First generalized properties of the materials will be discussed, and then based on these properties one material will be selected for a specific application. - Ceramics and Glasses Ceramics and Glasses are inorganic, non-metallic materials consisting of metallic and non-metallic elements bonded with ionic and covalent bonds. These are high strength bonding gives special characteristics to these materials.

The typical properties of these materials are as:

- Low to moderate density compared to metals, - High modulus of elasticity, - Provide good strength at elevated level of ...

Psychology

Dexter Morgan Dexter Morgan - a fictional character in a series of novels by Jeff Lindsay, and the protagonist of the television series "Dexter". In the novels and television series, Dexter is a forensic medical expert on blood spatter, who works for the Miami Police Department, but also, he is a serial killer who preys on other criminals who have managed to cheat justice and escape the punishment. Dexter follows a special code, which his adoptive father Harry Morgan taught him when he was a child. The two most important rules of the "Code of Harry": never kill innocent people and always cover ...

ENGINEERING

Abstract Wind turbines have become a practical and efficient fossil fuels replacement for the generation of electrical energy. Characteristics optimized include weight, ease of manufacture and structural integrity. Ease of manufacturing has a direct relationship to costs. Lighter materials for blade construction are necessary to decrease blade weight and lengthen blades. Carbon fibers or composites of glass and carbon fibers are lighter than glass fibers. Hypothesis: controlling the speed of the infusion will allow the capacity to manage the speed of the infusion process and in that way control of the final composite material. Results showed that 68.5 meters has ...

Syringes are the familiar glass or plastic items nurses use to inject vaccinations or medicines. Plastic disposable syringes represent a huge and growing market, projected as $12 billion worldwide in 2015 (GIA, 2008). First used in 1853, syringes might be considered a mundane, mature product. However, the syringe market is undergoing a disruptive change, which gives opportunities for new market entrants (Wood, 2013). A disruptive change is a technology or behavior change that totally upends the traditional market. For example, digital photography virtually eliminated the old film photographs. Great film companies like Kodak failed (Disalvo, 2011). New electronics companies like Panasonic grew rapidly. ...

a Course, College, country b Course, College, country

Abstract

Tensile strength is a kind of force which is applied by pulling something such as rope, wire etc. to the point where it breaks [1]. The tensile strength of the material is the maximum amount of tensile stress that it can take before failure [1]. There is different kind of tensile strength yield strength, ultimate strength, breaking strength. The tensile strength can be found using tensile test which is a kind of the mechanical test [2]. Tensile test are simple, inexpensive and fully standardized. The motto of this paper is to analyze the tensile ...

Different parts of a car are made of different material. The choice of material to make different parts of a motor vehicle is influenced by factors like amount of stress handled by the part, cost of material compared to other alternatives and purpose of the part e.g. decoration etc. These are some of the factors the determine type of material a motor vehicle part is made of. An example of material and part on a car made using the material is given below. (A) Ferrous alloy 1.0 Part made of ferrous alloy

Engine components e.g. bolts and nuts, engine ducts and ...

EXECUTIVE SUMMARY

Special designs have been made to suit various sports. This is important as it plays an important role in sports performance. Companies have resorted to good quality textile materials to design sportswear clothing. Sportsmen should wear comfortable costumes for them to perform well in their competition. When designing sportswear, the market has to be identified first. That is the design to be used, the materials required and footwear. The fabrics available should also be identified. The comfort of the wearer is also considered as this affects performance.

History of polymers

Polymers have been used for centuries to manufacture plastics. Due to advance ...