Corrosion

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Definition of corrosion

Corrosion is the oxidation of metals by certain substances (mostly water and oxygen) in the environment. A metal corrodes when it gives up its electrons and loses strength and elasticity. Some common examples of corrosion include rusting of iron, surface oxidation of aluminium, tarnishing of silver and verdigris on copper. Corrosion can be classified into two categories

• Dry corrosion where the metal is oxidised directly by atmospheric oxygen.

• Wet corrosion is when the presence of water and air accelerates the process of corrosion.

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The condition which rusting of irons occurs

For iron and for any other metal, any region of electrochemical corrosion must have

a) an anode where oxidation occurs

b) a cathode where reduction occurs

c) a meta path for electron and

d) an electrolyte.

The rusting of iron will be hastened by the following conditions

1. The presence of oxygen is large concentrations at the surface of iron which will accelerate the corrosion of another area with less oxygen if there is electrical contact between them. This helps to explain why corrosion pits in iron can be very deep. Since the bottom of the pit has less oxygen than the top, it will act as an anode and corrosion in the pit will be accelerated.

. Pure iron is more resistant to corrosion than impure iron. Electrochemical cells can occur if, for example, copper is present. Copper can serve as a cathode half-cell since its atoms are less readily oxidised than iron atoms. The electrons travel through the iron and the ions through a moisture film to complete the circuit.

. Iron corrodes more readily where ions in the metal lattice have been distorted by stress.

The rusting of iron

Corrosion prevention

There are two basic ways of protecting metal surfaces from corrosion physical protection and galvanic protection.

• Physical protection eg. Paint and lacquer. The paint and acquer acts as a physical barrier which stops oxygen and water from making contact with the metal.

• Galvanic protection eg Cathodic protection. Ther are two main types of cathodic protection presently in use.

1. Sacrificial anode. Steel pipes, tanks ans ships are protected

galvanically by attaching lumps of magnesium or zinc to the

steel. The more active metal is more readily oxidised and

behaes as a sacrificial anode, whilst the steel is cathodically

protected.

. Impressed current. Metals such as iron can be connected to

the negative pole of a power source such as a battery.

Electrons are pushed onto the iron which is then cathodically

Protected. Please note that this sample paper on Corrosion is for your review only. In order to eliminate any of the plagiarism issues, it is highly recommended that you do not use it for you own writing purposes. In case you experience difficulties with writing a well structured and accurately composed paper on Corrosion, we are here to assist you. Your cheap research papers on Corrosion will be written from scratch, so you do not have to worry about its originality.

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Financial Investment Industry Product Cycle

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The investment industry is composed of a wide variety of firms. The main players include independent full line brokerage firms, investment bank subsidiaries of chartered banks, and discount brokers. Independent full line brokerage firms offer a wide range of services, including underwriting, trading of stocks, advice and research. The full service brokerage subsidiaries of chartered banks offer the same services; however, banks brokerage firms may have a larger pre-established clientele. Finally, the discount brokers are basic stockbrokers that perform trades for clients who do not want investment advice. Banks entered the investment industry, whereby they took over full-service brokerages, introduced mutual funds to the banking industry and became part of discount brokering.

The demand for investment financial services was expanding. This became evident by the average increase in revenue, which was happening in the mid 10's. An additional indication of growth in the investment industry was the fact that the number of firms in the industry had increased from the beginning days of the investment industry. It is obvious that the industry was growing; however the cause for this growth was due to the demographics of society point towards an aging population. This aging society is comprised of active retired and semi-retired individuals who have knowledge, time and disposable income for investing purposes. Moreover, younger generations that fear the elimination of the existing of social security because of the aging population were interested in building there own retirement plan.

Secondly, the fact that people wanted to be more educated about the investments industry ties into an additional cause for growth in the industry during this era. The market was offering more information to those who wanted to be part of it. This additional information reduced investors fear of not knowing enough, and if they choose to take advantage of the available information they could capitalize on it. Also, more information gives people the perception that they are able to make an increased number of higher quality investment decisions.

Finally, the entrance of banks into the industry increased public interest. First of all, banks carry a great deal of trust, which is extremely important to the average investor. Second, banks are higher profile marketers so they reach a larger number of people. In addition, the large number of branches makes the product readily available and easily accessible. Banks also have a large existing customer base to which they can market products, and influence investing. Overall, banks increased the demand for investment services by creating interest and awareness to people who would otherwise not give extensive consideration to investments.

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Chaucer's "THe Canterbury Tales" Prologue

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Krista Perry

Chaucer's Prologue

Chaucer presents a very positive picture of the pilgrims in the ruling class. Chaucer only shows respect to one religious figure and looks down upon the other five. Chaucer includes good qualities in knights and squires that he describes.

Qualities Chaucer includes in his Knights are honor, loyalty, respect, chivalry, generosity and courtesy. One page , Chaucer says "There was among us a brave Knight, who had loved chivalry, truth, and honor, generosity and courtesy from the time of his first horse back rides." Qualities in the squire were that of love, lust, strength, and happiness. Chaucer explains "All day he sang or played the flute; in fact, he was as joyful as the month of May", on page .

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Chaucer's view of the clergy class is not as positive as his view of the ruling class. The only religious figure presently positively is the Parson. Page 11 reads "Rich in holy thoughts and works, he was a learned man, a cleric, who wished to preach Christ's gospel truly and teach parishioners devoutly. He was benign, wonderfully intelligent, extremely patient..."

Chaucer's religious ideal is expressed through the parson. Chaucer described the Prioress as "Very much interested in etiquette. She was so kind and full of pity that she would week if she saw a dead or bleeding mouse." The monk loved hunting. He did not believe in learning, and spent more time hunting. The friar was described as "a licensed beggar, and a very gay man. He found husbands for many young women at his own expense. Well lived and intimate, and had more power than the parish priest, courteous and humbly helpful." The pardoner was amiable, "in his bag had a pillowcase which had served as a veil for our Lady; He has no beard, feigned with flattery and tricks…made monkeys of the parson and people" on page 15. The summoner was a friendly person. He controlled all young people of the diocese in his own way. He spoke only Latin, and knew philosophy well.

In conclusion, Chaucer presents a very positive picture of the pilgrims in the ruling class, and Chaucer's religious ideal is expressed through the parson. Reading Chaucer's "The Canterbury Tales" can help many students and people everywhere learn more about life during the Middle Ages. Chaucer's prologue is especially helpful because it introduces all the characters in an organized manor.Please note that this sample paper on Chaucer's "THe Canterbury Tales" Prologue is for your review only. In order to eliminate any of the plagiarism issues, it is highly recommended that you do not use it for you own writing purposes. In case you experience difficulties with writing a well structured and accurately composed paper on Chaucer's "THe Canterbury Tales" Prologue, we are here to assist you. Your cheap custom research papers on Chaucer's "THe Canterbury Tales" Prologue will be written from scratch, so you do not have to worry about its originality.

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A Technological Revolution

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A Technological Revolution

Computers are revolutionizing our lives. The Internet is fast becoming the world's source for information. The ability to make lives simpler is right at our fingertips in our own homes. The applications available are endless. The Internet has changed the way people gather information. Available to anyone is the ability to solve problems quickly and accurately. Accessing information at a keystroke is a convince unheard of ten years ago.

The computer has revolutionized communications. Through the use of LANs, WANs, satellite links, and the Internet, the user can now send e-mail or data across an ocean. This takes less time than it previously took address an envelope. Internet telephone service allows subscribers to talk long distance without incurring charges associated with conventional long distance services.

School papers on A Technological Revolution

Companies now use the Internet to reach customers. Shopping hours are no longer restricted. Twenty-four hour access to your favorite store, regardless of time zones is today's reality. .Consumers no longer need to be at the mercy of retail hours.

Search engines such as Yahoo and Excite are today's card catalogs. Search engines perform millions of queries a day. Whatever the theme, search engines can usually pull

up hundreds if not thousands of topics all in a matter of minutes. Not so long ago this required many hours of research at the local library.

The Internet contains thousands of image files on countless subjects The diversity of materials available on the net go far beyond the scope of the traditional library.

Online banking services are a relatively new service. Users are able to save an extraordinary amount of time. Customers can update balances and make transfers between accounts. Bills are paid without writing checks or licking stamps. Scheduled payments such as car payments or utility bills are automatically paid. A due date need never to be forgotten. Processing loans is quicker through the use of computers. In the past it could take weeks for a loan processing. Loans with the help of computers are now processed in a matter of minutes. Human error causes most banking mistakes, with today's online banking service costly mistakes, in most cases, are a thing of the past.

Buying a house is no longer a complicated task with the help of a computer. Companies such as ERA, Prudential, and Patterson Schwartz have WEB sites. Real estate WEB sites will show you properties in your desired price range and location. It does not matter if you are half way around the world from your future new home. Graphic images of selected properties are viewed from home. Mortgage companies also have WEB sites that enable you to compute a mortgage based on salary, insurance rates, and taxes, all at a keystroke.

Computers have revolutionized the way all forms of business are conducted. Be it private or public. A technological revolution is taking place. It's boundaries being only that of the imagination.Please note that this sample paper on A Technological Revolution is for your review only. In order to eliminate any of the plagiarism issues, it is highly recommended that you do not use it for you own writing purposes. In case you experience difficulties with writing a well structured and accurately composed paper on A Technological Revolution, we are here to assist you. Your cheap custom college paper on A Technological Revolution will be written from scratch, so you do not have to worry about its originality.

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DBMS

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A DBMS is a program, or a collection of programs, that allow the end user to

more effectively manage the database. A DBMS can be divided into three

subsystems. There include the Design Tools Subsystem, the Run-Time

Subsystem and the DBMS Engine.

College papers on DBMS

The Design Tools subsystem includes tools specific to the design of the

database components as well as its applications. These programs include

tools to aid in the creation and management of its Tables, Forms, Queries

and Reports.

The Run-Time Subsystem is what links the components that were created with

the Tools Subsystem and the data. Our book gives an example of a form that

is supposed to show the information contained in a field within a record of

the database. When the form is opened, it is the Run-Time Subsystem that

collects the data from the record and returns the information to the field

within the form.

The DBMS Engine is the backbone of the DBMS. It works together with the

other two subsystems and translates the request into commands that the

operating system can understand and execute. These include the calculating

of numbers as well as the display of the information to the screen.

Four components of database application are its Forms, Queries, Reports and

Application Programs. While the forms, queries and reports can be generated

through the Tools Subsystem. The application programs must be created, or

written, in a language that the DBMS can understand and link to.

1. Forms are the graphical user interface between the DBMS and the end user.

These forms can be used to display or update the record data information

within a database. These updates can include entering new records, deleting

or making changes to existing records. Forms make it easier for the end

user to accomplish their desired task without having to understand the

dynamics of what they are doing.

. Quires are how a user would query the data within a database to return a

specific ordering of the information. An example would be if the user

wanted to know all of the names and phones numbers of the restaurants in

their area code but not the addresses. A query would be able to pull the

desired information out of the database tables.

. Reports are the outputs of these quires. The data collected from a query

could be exported in a formatted sequence to a computer screen, a file or

directly to a printer.

4. Application Programs are code that is written to interact with a

database. These programs can be used to update a database or manipulate the

data within them. An example of an application program would be a C++

program that is used to connect to a database and update records. You can

also use application programming when designing forms to control the

interaction with an end user.Please note that this sample paper on DBMS is for your review only. In order to eliminate any of the plagiarism issues, it is highly recommended that you do not use it for you own writing purposes. In case you experience difficulties with writing a well structured and accurately composed paper on DBMS, we are here to assist you. Your cheap research papers on DBMS will be written from scratch, so you do not have to worry about its originality.

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