Chebyshev Linkage
Chebyshev linkage is a three-bar mechanism that converts rotational motion to approximate straight-line motion. This linkage was invented by Pafnuty Chebyshev, a 19th-century mathematician who studied theoretical problems in kinematic mechanisms. This mechanism is commonly used as the ‘Horse head’ design of a level luffing crane.
Transient Radiation
The effect of radiation on the thermometer’s accuracy depends on the type of thermometer and the specific conditions of the measurement. However, radiation can generally introduce temperature measurement errors by altering the heat transfer between the thermometer and the surrounding environment. The thermometer may radiant some of the absorbed energy, which can cause the thermometer to read lower than the actual temperature of the stream. This effect is known as radiation error and can be significant if the radiation is intense. To minimize the effect of radiation on temperature measurements, it is important to use a thermometer with a low thermal mass and good insulation. Additionally, it may be necessary to use corrections or calibration factors to adjust for the effects of radiation and ensure accurate temperature measurements in high-radiation environments.
Hydrogen Oxidation
Hydrogen has the potential to play an important role in the transition to a low-carbon energy system, and governments, industry, and consumers alike are increasingly recognizing its benefits as a fuel. Hydrogen can be used in various applications, including fuel cells, internal combustion engines, and gas turbines. When hydrogen is used as fuel, hydrogen and oxygen are combined and allowed to react together, and energy is released. The only by-product of the reaction is water, making hydrogen a zero-emission fuel. This makes it an attractive alternative to fossil fuels, which release harmful pollutants and greenhouse gases into the atmosphere.
Catalyst
A catalyst is a substance that increases the reaction rate without itself being consumed. The catalyst reacts with one or more reactants to produce chemical intermediates that can react more readily with each other or with another reactant to create the desired product.
Heat Transfer Mechanisms
Heat can be transferred by three modes: Conduction, Convection, and Radiation. Conduction transfers energy from the more energetic molecules to the adjacent less energetic ones.Convection is the mode of heat transfer from a solid to an adjacent moving liquid or gas, such as water or air. Radiation is the transfer of heat in the form of electromagnetic waves.