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What is quantum efficiency of laser diode?
© Dr. Rüdiger PaschottaLast update: 2009-10-04Quantum EfficiencyDefinition: percentage of input photons which contribute to a desired effectThe quantum efficiency (or quantum yield) is often of interest for processes which convert light in some way. It is defined as the percentage of the input photons which contribute to the desired effect. Examples are:In a laser gain medium, the pump process may require the transfer of laser-active ions from one electronic level (into which the ions are pumped) to the upper level of the laser transition. This pump quantum efficiency is the fraction of the absorbed pump photons which contributes to the population of the upper laser level. This efficiency is close to unity (100%) for many laser gain media, but can be substantially smaller for others. It may depend on factors like the excitation density and parasitic absorption processes.
What does work transfer?
Work is the transfer of force
Concept of maximum power transfer in transmission line?
Transfer capability in transmission system defines the capability of system to reliably transfer power from one zone to other or from one part to other without affecting system stability. Under this concept there are various terms like Available transfer capability (ATC), total transfer capability (TTC), capacity benefit margin (CBM), TRANSFER CAPABILITY MARGIN (TCM). The term maximum transfer capability is termed as Total Transfer Capability means maximum power transfer from one part to another without violating system constraints.
Explain open-loop transfer function of a close system?
An open loop transfer function is the transfer function of a system without incorporating the feedback component. For example, where the closed loop transfer function with unity feedback H(s) = G(s)/(1+G(s)) it can be deduced that the open loop transfer function is Y(s)/U(s) = G(s).
What is the condition of maximium power transfer of circuit?
Maximum power transfer happens in a circuit when the resistance of the circuit equals the reactance. Impedance Z = R + jX. At R=X, maximum power transfer happens.
What is the role of non-faradaic current in electrochemical processes?
Non-faradaic current in electrochemical processes refers to the flow of electrical current that does not involve the transfer of electrons between the electrodes and the electrolyte. This type of current does not contribute to the chemical reactions taking place at the electrodes, but it can still affect the overall performance and efficiency of the electrochemical system.
What do you think heat transfer is and how does it impact various processes and systems?
Heat transfer is the movement of thermal energy from one object to another due to a temperature difference. It impacts various processes and systems by influencing their efficiency, performance, and stability. For example, in engines, heat transfer affects combustion efficiency and power output. In buildings, it influences heating and cooling systems. Understanding heat transfer is crucial for optimizing processes and designing efficient systems.
What is the heat transfer coefficient of water and how does it affect the efficiency of heat transfer processes?
The heat transfer coefficient of water is a measure of how well water can transfer heat. It is influenced by factors such as temperature, flow rate, and surface area. A higher heat transfer coefficient means that heat can be transferred more efficiently between water and another substance. This is important in heat transfer processes like cooling systems or heating systems, where efficient heat transfer is crucial for optimal performance.
Is it true the energy use for metabolic processes reduces the efficiency of secondary productivity?
Yes, that is true. The energy used for metabolic processes by organisms at one trophic level reduces the amount of energy available for transfer to the next trophic level, ultimately impacting the overall efficiency of secondary productivity in an ecosystem.
What term refers to processes that do not involve heat transfer?
Adiabatic processes do not involve heat transfer between a system and its surroundings.
How does vibrational relaxation contribute to the overall efficiency of energy transfer processes in molecular systems?
Vibrational relaxation helps molecular systems efficiently transfer energy by allowing excess energy to be dissipated as heat, preventing the system from becoming too excited and losing energy through other pathways. This process helps maintain the stability and balance of energy within the system, ultimately enhancing its overall efficiency in energy transfer.
How does the structure of graphite account for the design of graphite electrodes?
The layered structure of graphite, in which carbon atoms are arranged in sheets, allows for easy electron mobility, making graphite a good conductor of electricity. This property is essential for graphite electrodes to efficiently carry and transfer electrical current during processes like electrolysis or electrochemical reactions. Additionally, the high thermal stability and resistance to chemical reactions of graphite make it suitable for use in harsh environments.
Do Emotional state rehearsal association and automatic memory all affect the transfer of information from short term memory to long term memory?
Yes, emotional state can influence memory transfer as heightened emotions can enhance encoding and retrieval processes. Rehearsal helps reinforce information in short-term memory, aiding in its transfer to long-term memory. Automatic memory processes can also impact memory transfer by improving the efficiency of encoding and retrieval.
What are the factors of thermal efficiencyhow does each factor affect thermal efficiency?
Factors of thermal efficiency include combustion efficiency, heat transfer efficiency, and frictional losses. Combustion efficiency refers to how well fuel is converted into heat energy, while heat transfer efficiency measures how effectively heat is transferred within the system. Frictional losses occur due to resistance in moving parts and can reduce overall energy output. Improving combustion efficiency, enhancing heat transfer mechanisms, and minimizing frictional losses can all help increase thermal efficiency.
How can the pressure volume diagram be used to analyze the thermodynamic processes of a system?
The pressure-volume diagram can be used to analyze the thermodynamic processes of a system by showing how pressure and volume change during different stages of the process. This diagram helps in understanding the work done, heat transfer, and efficiency of the system.
How are analogical processes related to transfer learning?
Analogical processes can be applied to the transfer of learning. Reasoning requires using old knowledge and can lead to new learning opportunities.
What is the recommended western blot transfer buffer recipe for optimal protein transfer efficiency?
The recommended western blot transfer buffer recipe for optimal protein transfer efficiency typically includes Tris, glycine, and methanol. This buffer helps to maintain the proper pH and ionic strength for efficient transfer of proteins from the gel to the membrane during western blotting.
