Vacuum tube

Howard Hathaway Aiken There is one truth about the world when observed upon from any standpoint; regardless of sex, race, or nationality…and that is to change. Change is ever present, constant, and continuous. Amongst the changes in the universe, humanity has had to learn to adapt to changes in the environment in order to survive. Humanity has evolved from eras such as stone-age, to the Industrial revolution, and finally to the information revolution. When viewing the antiquity of…

Abortion is wrong. Abortion is the murder of innocent children. Life commences at conception, and just because you can't see it doesn't mean it's not there. Unborn babies are human just like you and me and deserve the right to live. They are not less than us, so why shouldn't they get a chance? How come a mother can kill her child at one month old but not at fourteen years old? Overall, abortion is selfish because your not thinking about this other human being, your only thinking about yourself,…

when a fertilized egg attaches to any place other than the uterus, and no ectopic pregnancy can be saved, for it leads to internal bleeding, the victims fallopian tube to rupture and can be deadly. Sadly, women who have had ectopic pregnancies will be affected with difficulty in becoming pregnant again because they often have fallopian tube damage. In the case of ectopic pregnancies, abortion is necessary and without it the victim will most definitely suffer. The amount of damage from abortion…

Tiny particles react with each other every second to sustain our daily lives. These particles are called atoms, and they are the most basic and indivisible units of matter. They retain their identity through chemical reactions, yet they are so small that even the strongest microscope cannot detect them. The reasoning behind atomic reactions intrigued many intellectuals. To understand more about this concept, they had to comprehend the compositions of these particles. Although the scientist and…

“The shark is the apex predator in the sea. Sharks have moulded evolution for 450 million years. All fish species that are prey to the sharks have had their behaviour, their speed, their camouflage, their defense mechanisms moulded by the shark.” – Paul Watson. Sharks are cartilaginous fish with pair fins and nares, two chambered hearts and jaws. These characteristics are unique to the class, chondrichthyes. Ray, skates, and chimaeras are members of this class and sharks closest relatives.…

Many unborn babies have been killed and many others emotionally affected by abortion. Except in the case of rape or incest, abortion must become illegal. Abortion is the termination of a pregnancy and the death of a fetus. If induced, abortion is equivalent to murder. Abortion can be very harmful to both the mother and, of course, the unborn baby. Abortion is a procedure that kills unborn babies, and usually performed because the mother does not want her child. A pregnancy usually lasts…

in junior year at Columbia University’s School of Engineering, welcomed the opportunity to experiment with Lee De Forest’s new Audion tube in 1906. This device was then little understood, even by its creator, and Armstrong set out to ascertain exactly how it worked and how it could be improved. It is in the summer of 1912 that Armstrong discovered that the Audion tube Lee De Forest created could be used not only to detect and amplify signals but also to transmit them. He created a new…

a solution of 0.3% Methanol in chloroform was carefully added to the top of the column to elute the column. Upon adding the fresh eluent, curcumin and other compounds were eluted at a different rate. The eluted compounds were collected using test tubes. The collection of eluted compounds was stopped when the first intense band had reached the bottom of the column. At the meantime, TLC was carried out for all eluent collected from the column. Subsequently, a clean, dry round bottom flask was…

Nikola Tesla, (1856-1945) was the inventor of the World’s lighting and well-known for his contribution to the world of science and technology. Tesla, a son of priest from Orthodox faith, he was born in born in Serbian in the territory of Yugoslav. He is the first inventor of the outstanding radio communication. Tesla is also known for his invention, who devised the powerful alternating current (AC) model that significantly became the industry electric standard. AC is widely considered one of the…

Each time if we pay attention and see very important things around us like phone, car, internet and electricity, we realize that how many intelligence people were living centuries before us and now we can live an easy life. Enormous changes that we have and see in today’s world, they all are the result of those intelligence people’s life of never-ending quest. One of those intelligence people that has had a big effect on growth and development of our life was Nikola Tesla. He was a man, who made…