Vacuum tube

2. Basic theories and principles 2.1 Chemical vapor deposition 2.1.1 Definition of chemical vapor deposition Chemical vapor deposition (CVD) is a versatile process which is widely applied to produce coatings, powders, fibers and monolithic components [1]. Applying the chemical vapor deposition, it is possible to produce alloy and compounds of metals and nonmetal materials. Chemical vapor deposition can be defined as the deposition of a solid on a heated surface from a chemical reaction in the…

Introduction Copper is an element that can be typically obtained from copper ore (minerals) in the Earth’s crust(1). The ore is initially mined then goes through processes to recover copper(2). Copper is important as it many chemical and physical properties. Copper is a good conductor of electricity and is malleable (the ability to be bent) which is why copper is used in electrical wiring. It is also used in bronze and brass as an alloying agent(3). Chemists use a sequence of chemical reactions…

Nowadays, throughout the world, doctors and medical professionals perform a suction of thousands of babies from their mothers ' wombs through a procedure known as abortion. Today, the law protects and provides consent to both the mother and medical professional to follow through with the procedure. However, the babies seemingly have no right to protection or life themselves because of the argument regarding when a fetus is determined to be human and have a life. Therefore, abortion should be…

The History of Video Games and the Impact on Our Society from 1950-2000 Video games have had a large impact on our society over the decades. It has become one of the most popular interactive mediums in recent human history. Many people either have a home console or computer that they play video games on in their leisure time. The global video game industry today is now worth $99.6 billion, and is projected to be worth $118.6 billion by 2019 . How have video games become this popular? What…

environment was provided through a continuous nitrogen gas purging during the synthesis. With regard of ensuring a complete reaction, the aging time of the mixture inside the four-nick flask was 20 min. The black iron precipitates were collected by vacuum filtration and then washed three times with DI water and anhydrous ethanol. Batch experiments All batch experiments were conducted in 300 mL conical flasks sealed with screw caps at room temperature (25 ± 0.5°), and mixed with a standard…

The goal of this experiment was to use the technique of thin layer chromatography (TLC) to identify the active analgesic ingredient of Advil and monitor the transesterification of methyl salicylate from acetylsalicylic acid. The synthesized methyl salicylate was then purified using acid-base chemistry and analyzed using H NMR spectroscopy. Identification of a proper mobile phase to separate common analgesics used in over-the-counter pain relievers was essential in being able to determine the…

Throughout history, humans have been overcome by cursitory to figure out the way our universe works. In the past hundreds of years, there have been numerous discoveries that revolutionize modern civilization and the way humans have thought about Earth. One of the most significant discoveries that humanity has found was the fact that everything is made up of elements. The Noble Gases in particular, set the precedent for what all other elements strive to become. Every element in the periodic table…

Player Piano is a science fiction that deals with the advancement of technology in the modern world. This shows the anti-machine sentiment.Kurt Vonnegut was surrounded by engineers and machinery in the city of Schenectady and this is the main reason for writing the novel Player Piano. Player Piano takes the trend toward automation about whatKurt Vonnegut observed at General Electric and his experience at his work place is the prime reason for its logical conclusion. Few engineers and managers…

The aim of this experiment is to reduce chromium (III) to chromium (II) using Zinc as an oxidising reagent using Schlenk techniques in the inert gas atmosphere using Nitrogen. The goal is not to let oxidation happen that will prevent the formation of chromium (II) species. Also, the aim of this experiment is to successfully form chromium (II) acetate, to find its percentage yield and to conduct IR analysis to prove the success of the reaction as well as the purity of the compound. Magnetic…

They then insert something into the mother that connects to a vacuum machine which then tears the baby to pieces as it sucks it out of the mother’s womb and places it in a jar or tube that they discard. There is another form of abortion that is very similar to the Suction Aspiration. This method is called Dilation and Curettage. It’s pretty much the same thing as the Suction Aspiration method except a sharp knife is attached to the vacuum and the baby is cut into small pieces and placed in a…