Inert gas

A gas is a piece of matter that fills the shape of the container that it is in. It always has a uniform density inside the container even in the presence of gravity and no matter how much substance is in it. The atoms in a gas are not compressed unlike liquids and solids and move freely among each other. Even though they are not compressed, they ARE ABLE to be compressed in order to reduce its volume. When gas is heated, it gains kinetic energy, which makes the atoms move more rapidly. And when…

mobile phase contents and increase the composition of mobile phase. The gradient pump needs dual pump but the isocratic is only needed for single pump. The number of pumps in a HPLC instrument is depends on the flowing conditions. The pump also must be inert to the…

the state of New York. Natural gas has been portrayed to the people as a cleaner, safer, alternative energy solution. But it too presents its own hazards. Since the current method used to…

This poses the problem of energy recovery: in fact, a large amount of energy is required to pre-heat the feed to the reaction temperature, and a fraction of this energy can be recovered from the treated gas to pre-heat the feed. In any case, a certain amount of energy has to be supplied, as the efficiency of this approach is usually not higher than about 70% [2]. In this framework, a particularly effective technology is represented by the reverse-flow…

Thermal energy strorage Thermal Energy Storage is the temporary storage of high or low temperature energy for later use, bridging the gap between requirement and energy use. The storage cycle might be daily, weekly or seasonal depending on the system design requirements, and whilst the output will always be thermal, the input may be thermal or electrical. Principle 1) Sensible Heat Storage Heating a liquid or solid, without changing the phase: This method is called sensible heat storage.…

High performance liquid chromatography (HPLC) is a separation technique utilizing differences in distribution of compounds in two phases; called the stationary phase and the mobile phase. The stationary phase designates a thin layer created on the surface of fine particles and the mobile phase designates the liquid flowing over the particles. Under a certain dynamic condition, each component in a sample has a different distribution equilibrium depending upon the solubility in the phases and or…

These activities includes burning oil, coal and gas thus releasing CO2 into the atmosphere. There are farming practices and land-use changes that increases the amounts of methane and nitrous oxide that’s being released. Factories produces long-lasting greenhouse gases that does not occur naturally in…

Vulcanizing mold To form a tread on green tire, a mold must mold and melt the rubber. The inside circumference of the circular tread face part of the mold that will be in contact where the tread of the green tire will be is a negative shape of the tread to be on that green tire to be shaped. The outside of the circular tread face is in contact with the pre-heating or curing molds inside circumference. The tread shapes on the tire is formed by ribs and/or lugs on the inside of the circular…

Predicting surface temperature is nearly impossible. If it were possible to change greenhouse gases, it would be simple to calculate change in our temperature. If you were to change a single greenhouse gas, it would have an effect in other components. Efforts to change the system are known as “feedbacks”. Water is the most important and uncertain. Usually molecules remain in our atmosphere for hundreds of years, but water molecules only remain in the atmosphere for a few weeks. It is constantly…

As explained above, the governing equations of the gas mixture that include continuity, momentum and mass fraction of the components, are solved at first. Transient conservation equations are as follow: Mass conservation (1) (∂(ε(1-s)ρ_g))/∂t+∇.(ρ_g u ⃗_g )=S_m In this equation u ⃗_g is superficial velocity vector of gas mixture, which related to intrinsic fluid velocity U as following: (2) (u_g ) ⃗=ε(1-s)U ⃗ In the gas transfer channel, the porosity is equal one and the liquid water volume fraction…