вторник, 10 октября 2017 г.

Prepositions

Prepositions

We commonly use prepositions to show a relationship in space or time or a logical relationship between two or more people, places or things. Prepositions are most commonly followed by a noun phrase or pronoun (underlined):
The last time I saw him he was walking down the road.
I’ll meet you in the cafe opposite the cinema.
It was difficult to sleep during the flight.
It was the worst storm since the 1980s.
Give that to me.
There are over 100 prepositions in English. The most common single-word prepositions are:
about
beside
near
to
above
between
of
towards
across
beyond
off
under
after
by
on
underneath
against
despite
onto
unlike
along
down
opposite
until
among
during
out
up
around
except
outside
upon
as
for
over
via
at
from
past
with
before
in
round
within
behind
inside
since
without
below
into
than
beneath
like
through
Although most prepositions are single words, some pairs and groups of words operate like single prepositions:
They were unable to attend because of the bad weather in Ireland.
Jack’ll be playing in the team in place of me.
In addition to getting a large fine, both brothers were put in prison for three months.
I always get nervous when I have to speak in front of an audience.
We estimate that there’ll be up to 10,000 people at the concert.
The most common prepositions that consist of groups of words are:
ahead of
except for
instead of
owing to
apart from
in addition to
near to
such as
as for
in front of
on account of
thanks to
as well as
in place of
on top of
up to
because of
in spite of
out of
due to
inside of
outside of

Prepositions or conjunctions?

Some words which are prepositions also function as conjunctions. When we use a preposition that is followed by a clause, it is functioning as a conjunction; when we use a preposition that is followed by a noun phrase, it stays as a preposition. Among the most common are after, as, before, since, until:
After I’d met him last night, I texted his sister at once. (conjunction)
After the meeting last night, I texted his sister at once. (preposition)
We’ll just have to wait until they decide what to do. (conjunction)
Okay, we’ll wait here until six o’clock. (preposition)

Prepositions or adverbs?

Several words which are prepositions also belong to the word class of adverbs. These include: about, across, around, before, beyond, in, inside, near, opposite, outside, past, round, through, under, up, within:
There were lots of people waiting for a taxi outside the club. (preposition)
A:
Where’s your cat?
B:
She’s outside. (adverb)
The gallery is opposite the Natural History Museum. (preposition)
A:
Can you tell me where the bus station is?
B:
It’s over there, just opposite. (adverb)


суббота, 7 октября 2017 г.

Требования, предъявляемые к аннотациям

Требования, предъявляемые к аннотациям
Аннотации не стандартизированы. Общие требования, которые необходимо учитывать при составлении аннотаций, особенно справочных, сводятся к следующим:
1.            Композиция аннотаций должна быть логичной и может расходиться с композицией аннотируемого документа.
2.            Язык аннотации должен быть лаконичным, простым и ясным, без длинных и сложных периодов. Нередко справочные аннотации состоят всего из нескольких называемых предложении.
        3.       Отбор сведений для аннотации и порядок их следования зависят от характера аннотируемого документа и от назначения аннотации.


Слова и словосочетания для пересказа текста и реферирования.
1.   данная статья - the present paper (article, composition, essay)
2.    тема - the theme (subject - matter)
3.    основная проблема - the main (major) problem
4.    цель - the purpose
5.    основной принцип - the basic principle
6.    проблемы, связанные с - problem relating to;
7.    аналогично - similarly
8.  поэтому, следовательно, в результате этого - thereforehence
9.    наоборот - on the contrary
10.  тем    не менее - nevertheless; still; yet
11. кроме того - besides; also; again; in addition
12. сначала - at first
13.  далее, затем - next; then; further
14. наконец, итак - finally
15.  вкратце - in short; in brief
Цель написания статьи:
1,  The object (purpose) of this paper is to present (discuss, to descnbe,to show, to develop, to give)...
2.  The paper (article) puts forward the idea (attempt to determine) 


Вопросыобсуждаемые в статье:
1. The paper (article) discusses some problems relating to (deals with some aspects of, considers the problem of, presents the basic theory, provides information on, reviews the basic principles of)...
2. The paper (article) is concerned with(is devoted to)....


Начало статьи:
1.  The paper (article) begins with a short discussion on (deals) firstly with the problem of...
2.  The first paragraph deals with...
3.   First (at first, at the beginning) the author points out that (notes that, describes)...


Переход к изложению следующей части статьи:
1.   Then follows а discussion on...
2.    Then the author goes on to the problem of...
3.    The next (following) paragraph deals with (present, discusses, describes)...
4.    After discussing ... the author turns to...
5.   Next (Further, Then) the author tries to (indicates that, explains that)...
6.   It must be emphasized that (should be noted that, is evident that, is clear that, is interesting to note that)...


Конец изложения статьи:
1. The final paragraph states (describes, ends with)...
2.  The conclusion is that the problem is ...
3.  The author concludes that (summarizes the)...
4.   To sum up(To summarizes. To conclude) the author emphasizes(points out, admits) that...
5.    Finally (In the end) the author admits (emphasizes) that...


Оценка статьи:
In my opinion (To my mind, 1 think)...

The paper (article) is interesting (not interesting), of importance (of little  importance), valuable (invaluable), up-to-date (out-of-date), useful (useless). 

пятница, 12 мая 2017 г.

Difference between Mass and Weight

Difference between Mass and Weight



What is the difference between Mass and Weight?

What is the meaning of the sentence when someone says “His weight is 40 kg?”
The term ‘weight’ is commonly used to describe the amount of matter that is contained in an object or a person. Though conventionally correct, seen technically, this description is very wrong! The given definition can be used to define the mass of any object or person but not weight.
What, then, does weight actually mean?
Let us start from scratch and see what does mass and weight mean individually.

What is Mass?

It defines the amount of matter in the object.

What is Weight?

It defines the amount of force exerted by the gravitational force on the object.
Given the definitions of weight and mass, we can extract the differences between mass and weight.
Mass is the basic property of a matter whereas weight defines the force with which the mass of an object is pulled down due to gravity.
Let us imagine we take a trip to moon. What do you think your weight and mass would be on moon? The mass never changes with place, but weight does. Hence, on moon, your mass would be the same as that on earth whereas your weight would differ as according to the gravitational pull exerted by the given planet.
Mass is a scalar quantity whereas weight is a vector quantity. Now, what exactly does scalar and vector mean?

What is Scalar?

The quantities which describe only the numerical value of a given force are known as scalar quantities. The example, as given above, is mass. More examples include speed, time temperature and such.

What is Vector?

The quantities which describe the direction along with the numerical value of a given force are known as vector quantities. The examples of vector quantities are weight, velocity, acceleration and many more.

Units of Mass and Weight

  • Mass : The unit of mass is Kilogram(Kg).
  • Weight : The unit of weight is Newton(N).
Mathematically, the weight of an object is equal to the mass of that object multiplied by the gravitational force.
W=mg
where W is the weight, m denotes the mass and g is the universal acceleration of gravity or in simpler terms, Gravity.
These two quantities do not even have the same units of measurement! How can they be same? In conclusion, both the quantities are different but not independent from each other.
Activity :
The mass of a laptop on earth is 2 kg, and the constant gravitational force is 9.8 m/s2, what is the weight of the laptop.
Answer : w = mg
=(2 kg)* (9.8 m/s2)
=19.6 N

Branches of Physics (Free Lecture)

Branches of Physics (Free Lecture)




Newton’s Laws of Motion

Motion in Physics

Motion is one of the major topics in physics. It is a part of mechanics. Scientists have set different laws or rules which explain motion and the causes of changes in motion.

Mathematical Principles of Natural Philosophy

The most famous laws of motion were formulated by Sir Issac Newton. The three laws of motion were compiled by him in Mathematical Principles of Natural Philosophy (published in 1687) His laws of motion are three physical laws which actually laid the foundation for classical mechanics. Scientists have used certain basic terms to describe motion.

Terms used to describe motion

Force: It is required to act on an object to move it or to change its motion.
Velocity: It is also known as speed .Velocity of an object is influenced by forces.
Acceleration: It is a measure of how much the velocity of an object changes in a certain time (one second).
Mass: It is the amount of something present and is measured in grams or kilograms.

What are the three laws of motion?

1. Newton’s first law of motion

Every object in a state of motion tends to remain in that state of motion unless an external force is applied to it. This is also known as Law of inertia.

2. Newton’s second law of motion

The relationship between an object’s mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors. In this law the direction of the force vector is the same as the direction of the acceleration vector. This law defines how velocities change when forces are applied.

3. Newton’s third law of motion

For every action there is an equal and opposite reaction. This happens in a situation such as if we step off a boat onto the bank of a lake. As one move in the direction of the shore, the boat tends to move in the opposite direction. If not careful, the person may fall.

Laws of motion facts

The three laws of motion are verified over years by experiments and observations. They are found to be excellent approximations at the scales and speeds of everyday life. However, these are inappropriate for use at very small scales, very high speed and strong gravitational fields.