I want to introduce a package for drawing chemical structures i.e. ACD/ChemSketch. You can draw chemical structures including organics, organometallics, polymers, and Markush structures by this software. It is also possible to calculate molecular properties with this software. You can view the structures in 2D and 3D views. Another important thing is that this software is FREE . . .
The cotton yarn under microscope is amazing. There are several threads going in each other. It is enjoyable. Here we have provided two images one with 100x zoom and the other is with 300x zoom.
Foot finger has some lines and this view under microscope is amazing. Below we have provided finger skin microscope photo both at 100x and 300x zoom. The lines are those which makes the finger prints.
The human hair structure is wonderful and amazing under microscope. In this post I have got a microscope image of a human hair with 100x and 300x magnifier microscope. Hope to enjoy this microscopic photo.
Click more to see 300x image . . .
There are several types of fuel cells. These are categorized in 5 main parts as below:
- Solid oxide fuel cell (SOFC)
- Alkaline fuel cell (AFC)
- Phosphoric acid fuel cell (PAFC)
- Molten carbonate fuel cell (MCFC)
- Polymer electrolyte fuel cell (PEFC or PEM)
In addition to the above categories, there is one more type named direct methanol fuel cell or DMFC. But this type is commonly included in 5th group. The working temperature of fuel cells can vary between 80 degrees Celsius for PEFCs and 1000 degrees for SOFCs. Low temperature cells have H+ and OH– carriers that exchange ions through electrolyte and electrons through an external circuit. In high temperature cells like MCFCs and SOFCs, electric current is carried by CO32- and o22- .
Fuel cells have several advantages that make them a suitable replacement for ordinary power production devices. These advantages are high efficiency, wide range for design parameters, environment friendly, Wide range for selecting fuel, less energy loss, low maintenance,etc. These advantages are discussed below . . .
Fuel cell is a new technology to produce high amounts of energy using direct oxidation of fuel by oxygen, without any environmental or noise pollution. As fuel cells have very high efficiencies with lower thermal energy loss, they can be a considerable replacement for Carnot cycle to produce electricity.
Activated Carbon is the most important sorbent in ANG process. There are several types of activated carbon and main factors to choose the suitable one are total surface area, density, and pore volume. Total surface area is the most important one among these factors and is calculated through nitrogen adsorption on carbon in square meter per grams of carbon. This parameter can have values between 500 – 1900.
Natural gas comprising more than 20 percent of methane has been used as a fuel for vehicles and that’s because of the low cost and less environmental effects relative to gasoline. Methane, the main component of natural gas, is in gas phase at STP condition. As it has very low density, for unit volume of methane, low amount of energy will be produced, requiring high amounts to be stored in tanks.