Pocet referatov: 2684

Magnesium

MAGNESIUM
Physical Science Research Paper


General Information



Symbol: Mg
Atomic Number: 12
Atomic Mass: 24.305 amu
Melting Point: 650 °C (1202 °F)
Boiling Point: 1107 °C (2024 °F)
Classification: Alkaline Earth
Density: 1.938 g/cm3
Color: grayish
Crystal Structure: Hexagonal

Date of Discovery: 1808
Discoverer: Sir Humphrey Davy
Mostly Obtained From: Seawater


No. of Energy Levels: 3

Mathematics and War

Mathematics and War
by Tomas Kubes

Introduction

Mathematics and war through ages


Stone Age

Grece and Romas

Renaissance

Industrial Revolution

Second World War
The future

List of Sources



What is it all about
Conflict, old as mankind itself, the clash of different opinions, and the will to put the conflict down, are twinning man from the very beginning of the times. There are many w

My best friend

My best friend
(VAJ)

My best friend is my class - mate. Her name is Michaela (it is Michelle in English). She is of an average height, has longish straight hair which is sort of brown. Her face is oval and her eyes are light - brown. She has some freckles on her nose and she wears earring in her nose. She sometimes wears glasses. She likes wear sunglasses in the summer very much. She is very slim. She usually wears blue jeans or her black trousers and T - shirt or sweater.
She is quite frank, helpful, generous, cleve

My first love

When I was 11 years old we moved with my parents to a small family house at the periphery of the town. First few weeks I was against it because I did not want to leave all my friends I found through the years we lived in the housing estate. So it took while since I established in the new house and neighbourhood.
Then I began to meet with the children from the neighbourhood and soon I found a lot of friends. It has been a really nice place to live. There was a really beautiful playground near our house and also a big park with a lot of tr

My town - Klášterec nad Ohří

Klášterec is a smaller city. It lies on the left riverside of Ohře and it has nearly 17.000 inhabitants and it has quite long tradition. For the first time it is being mentioned as a branch of and monastery in Postoloprty. It was built between the years 1150-1250. After this small Benedict cloister got the village the name too - Claustrellum. This name was used since the year 1352, and four years after this, the German name Klosterlin. The Czech name Klasterecz we can find in the year 1407.
After the Benedicts have left Klášterec, t

Over the map of Czech Republic

The Czech Republic is situated in Central Europe. It is said that it lies in the heart of Europe. The Czech Republic is an inland country. It's area is about 79.000 square kilometres. It is located in the temperate climatic zone.
Our republic has four neighbours. In the north it borders on Poland and in the south on Austria. The shortest border is with Slovakia in the east and the longest with Germany in the west.
The Czech Republic has a population of about 10,3 million inhabitans. It consists of three parts - Bohemia, Morav

Over the map of UK

Britain lies off the northwest coast of the Europe across the English Channel, the Strait of Dover and the North Sea between 50o North and 60o North latitude, and the prime meridian of 0o passes through the old observatory at Greenwich.
It consists of two large islands (Great Britain and Ireland) and about 5000 smaller ones (e.g. the Isle of Wight off the southern coast of England, the Isles of Scilly off the extreme south-west, the Isle of Man in the Irish Sea, Anglesey off North Wales, western Scotland is surrounded by numerous islands

Political system of Great Britain

The Overall Review
Great Britain is a constitutional monarchy with the Queen as the head of state. Britain is divided into four
parts: England (London capital), Wales (Cardiff), Scotland (Edinburgh) and Northern Ireland (Belfast).
Wales was`politically linked in 1536. The English and Scottish crowns were united in 1603 and their parliaments
in 1707. Ireland became the part of this union in 1801 but in 1922 the most of Ireland (Roman Catholic) became
a separate state. Now it is the Irish Republic (Dublin capita

Prague

Prague is the capital of the Czech republic,the biggest, oldest and the most important city ,the seat of parlament and of government authorities.The town covers an area 496 km2,it has 1,2 mil inhabitants,the highest point lies 399 m,the lowest 177 m above sea level.The density of population is 2438 inhabitants per 1 km2.Prague is the biggest industrial,commercial and financial centre of Czech republic too.
Of Prague´s history:
The Slav population began to seattle in Prague basin the second half of the 6th century. The history of

Russia and Europe

You would have to be heartless, not to regret the disintegration of the USSR, but you would have to be brainless trying to restore it.
Vladimir Putin
Thinking about the chosen topic, many associations come to one's head. I would even dare to call it provoking, as it raises plenty of questions. With no doubts, the theme can be a source of uncountable academic disputes. Why is that? In my opinion, the problem is far more general. It does not lie between Russia and the European Union, but in the relation between Russia and Europ

School systems

THE SCHOOL SYSTEM IN THE CR
The school attendance is compulsory from the age 6 or 7 till 15 or 16 in our country. We have mainly state schools
but we can find also some private or church schools. The education in the state schools is free of charge. The school
year starts on 1st September and finishes on 30th June of the following year. The school year is divided into two terms
(September - January, February - June). One lesson lasts 45 minutes and there are small breaks between the lessons.
Pupils are evaluat

Science and technology

Today's society cannot imagine life without technology. Modern
inventions are everywhere, even now in this very room. I wear watches that use
microchip, I got electronic diary that uses microprocessor, most of us have
cellular phone. Light in this class is provided by electricity.
Long time ago there was just a man and his load. Weight of his load was
limited by his own power. Someone noticed, that there are some animals, they
are stronger than a human and are also much faster. So it was decided to

Television

First of all something interesting about the Radio & the television in other country

Majority of people can not imagine life without this mass mediums. These programmes are spread all over the world and foreign broadcast can be found in many countries. People use radio and television to get the latest news from the world.
Broadcasting in Britain is controlled by the British Broadcasting Corporation and the Independent Broadcasting Authority. The BBC is financed by the government, but the private stations controlled by t

The British Commonwealth

7 - The British Commonwealth
CANADA
Canada borders on the USA in the south and on the Arctic Ocean in the north. It's the second
largest country in the world (after Russia) but most of the area is thinly populated. Population is
concentrated near to the US border.
In the western part there are Rocky Mountains and they shield ocean climate to go to inlad.
The highest peak is Mt. Logan (6 050 m). In Canada there are four main water systems:
1) Great Lakes and St. Lawrence river
2) Syste

The first settlers in Britain

The first people of the type of Homo Sapiens lived in nowadays Britain in late
Old Stone Age as far as some 40,000 years ago. Those were the cave dwellers
dependent wholly upon hunting, fishing and gathering wild fruits.

The first settlers of the modern age came to Britain during the period of the
New Stone Age around 3,000 BC. They settled along the chalk hills of The
first people of the type of Homo Sapiens lived in nowadays Britain in late Old
Stone Sussex and in the fertile-soiled Southeast o

The history and playing of jabing game

Pool, billiards, snooker, carom - these are the names of playing a interesting game with balls (or better globes).
When did this game start does nobody exactly know as well as which from this games is the older one. Some people think that billiards developed from a old game called "Crooked", other people think it developed in atiquity too.
Really underlayed is its appearance not until the Renaissance in the era of 15th and 16th century. For example in the inventary document of a French noblewoman Charlotte d' Albert

The nice visit from the Great Britain, 3 day program

The nice visit from the Great Britain

Lucie is my cousin. She was born in Czech Republic, but now she is living in Great Britain. When she was here, we were very good friends. But she left to the England 3 years ago. She is quite tall, has very short black hair. Her face looks like a princess and her eyes are brown. She is very slim and has such a big nose. She usually wears jeans and a T-shirt or a sweater.
She is quite frank, helpful, clever, obstinate and reliable. She's very temperament and never tired. She seems t

Tobacco industry

I have prepared something for the smokers between us. Exactly for the cigar smokers. I have prepared something, what should every good smoker know, and remember by smoking a good cigar.
Firstly I would like to mention some quotations from famous people:

The world has never born such jolly seed.
Barten Holyday, 1918

Noble tobacco! Who illuminates at the east and at the west side the day full of distress with joy.
George Gordon Byron

Smoking is human, smoking of cigars is godlike.

Trip to Prague

The Prague Castle - Castle Stairs - Malostranská - Charles Bridge - the Old Town Square

Prague is the capital of the Czech Republic and it's situated on the river Vltava. The oldest parts of Prague are about 1000 years old. It's the center of president and government and it's very popular for tourists because of its historical places.
I start my walk guide in the Prague Castle. It's a dominant of Prague and the most cultural monument of Prague. It was founded in 9th century by the Přemyslide dynasty. I

USA Geography, places

USA - GEOGRAPHY, PLACES OF INTEREST
-the official title: The United States of America
-50 states+territory of the capital+Alaska+Hawaiian Islads

The USA occupies more than one third of the North America(n?) continent. It borders on
Canada in the noth and on Mexico in the south. The USA is washed by the Atlantic Ocean in the
east and by the Pacific Ocean in the west. The USA with its population over 260 000 000
inhabitants is the third state in theworld.
Generally the western part of the US

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