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Wonder metal
The story of titanium is extraordinary.To begin with,it was discovered twice.A British scientist,William Gregor, found it first and called it menachanite and six years later, in 1797,M.H.Klaproth, a German chemist, also found it and gave it its present name.
For many years,titanium was of interest only to research chemists it considered too brittle to be of any practical value.
It cost the chemists in many countries endless efforts to isolate pure titanium
and even more to start producing it commercially.In 1948 the world stock
of pure titanium was only ten tons. Today the output is much larger.
Titanium has one surprising property it is completely inert in biological
media,sometimes the medical community was quick to notice. It is being
used to make artificial joints and many other things necessary in surgery.
Titanium's instruments do not corrode,are thirty per cent lighter than
instruments made of stainless steel.
Titanium's high standard of corrosion resistance,lightness, tensile, strength
and the ease of forging, rolling and stamping are finding it more and more
uses.Titanium alloys are very useful in mechanical engineering.It shows
good work at chemical plants, in the pulp-and -paper and food industries.
Moreover, it is still a source of surprise for the investigator.
A group of researchers under the leadership of Prof.Kornilov produced a
material that has a kind of memory, as the following experiment shows:
a thin bent strip of the new alloy was clamped to a stand, a 500-gram weight
hung on the free end. A current was passed through for several seconds,
which heated the strip to more than 100 *C. As if commanded by an
enigmatic force,it straightened out like a tight spring and lifted the load.
When the current was switched off,the strip gradually went back to its
original shape.The cycle was repeated a number of times,and the strip
always remembered its original shape. The surprising phenomenon of
direct conversion of thermal energy into mechanical is seen with the
naked eye.
:
1.Why is the story of titanium extraordinary?
2. What is surprising property of titanium?
3.How can you explain that the material has a kind of memory?
1.
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2.ϳ The substance that changed the world :
)properties of plastic;
b) the first an-made plastic;
c) the early uses for plastic;
The plastic age
It's in our homes. It's the most common material in the workplace
Sometimes it's even in our bodies. We may be moving into the Information Age, but it's hard to believe that we are not living in the Plastic Age.
The very name plastic means versatility.You can bend it, mold it, model it, twist it and ply it in a number of different ways.The finished product can be a soft and airy foam or a hard and strong compound rivaling the sturdiest metal alloys.In its many forms,plastic has forever
changed the way we live.
The first in the long line of man -made plastic was called Bakelite,after its inventor,Leo Baekeland.Many years of work in his chemistry
lab in Yonkers,New York, led him in 1907 to the invention of the first synthetic polymer (plastic), made by linking small molecules together to make large ones.
Baekeland made his material by mixing the carbolic acid (phenol) with the strong smelled formaldehyde to make a third material that was nothing like the original two.It turned out to be a substance that would change the world.
Some of the early uses for plastic were to make thing like radio cabinets,button,billiard balls, pipe-steam, toilet steam, airplane parts and the object of Baekeland's research,shelleac. Baekeland's trick was to take the resin produced by the two chemicals and heat it under pressure to produce a soft solid that could be molted and hardened or powered and set under pressure. With this innovation, the plastic revolution was under way.
:
1. What can we do with plastic?
2.Why was man-made plastic called?
3.What were the early kind of plastic?
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To look for, work experience, employment, multinational company, license, customer services, taxation, to seek an employment, customs, fluent, male, female, translator, part-time, public relations, estate, project managing, university degree, further information, computer experience, guide company, drivers license, reliable, responsible, qualified, research centre, considerable abilities.
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What is resume? Resume is a summery of somebodys experience areas, which are necessary for position he applies for.
What main rules or points is it consisted of?
A resume takes a great part at finding a job. The good made resume must give the complete picture of your work experience and your qualification.
A resume consists of such main points:
1. Name, the last Name, address, telephone, age.
2. Education and qualification (it is necessary to begin with the last educational establishment you graduated, and also from the last place of work and to transfer all in a reverse order).
3. Position, which you desire to occupy.
4. References.
III. : mini-resume
| 376 West 186th Street, Apartment 6-J. New York, #4. 10033 tel.(212) 973-6792 Objective: A position of a programmer. Summary: 15 yers of experience in software programming. Familar with different kinds of computer languages. Experience:IBM (Research Centre) 2004 - presentSoftware programmer. Educat ion:Massachusetts Institute of Technology. 1995-2003Dr. Sci. (Mathematics). Personal:Married, two children |
IV. :
1. Name, surname, age;
2. Address, telephone, mob. telephone;
3. Education;
4. Qualification;
5. Work experience ( )
6. Personal;
7. Interests.
:
1. What is resume?
2. What are the main points of resume?
3. Must we be honest writing resume?
4. Will you follow the advice: Dont go to an interview without a record of former employment.?
:
1. Business Writing Clear and Simple Copyright 2007 Learning Express, LLC
2.David Chappell, Derek Marshall Vinsent, Power-Smith Simon Cavender. Building Contract Dictionary.Third Edition.
3.John Forster.Effectiv writing skills for Public Relations. Forth Edition.
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An offer of employment-
Apprenticeship training-
Attend-
Degree-
Dependants-
Divorced-
Duration-
Duties-
Employer-
Income-
Language proficiency
Major subjects-
Married-
Never married
Physical and mental disability-
Primary school-
Regarding-
Relationship-
Reside-
Salary-
Secondary school-
Separated-
Suffer-
Trade qualification-
Trade-
Training-
Unemployment-
Widowed-\
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QUESTIONNAIRE
There are dirrerent types of questionnaires in every country, they are used when people apply for a job or a university, join the army, or ask for various allowances.
To fill in a questionnaire is not just a formality, how a person does it may change a lot in his life, influence his professional career.
The questionnairy given below is most frequently used, when it is demanded a detailed information about a
person's professional qualification.
