نتایج جستجو برای: threshold temperature
تعداد نتایج: 568339 فیلتر نتایج به سال:
Satellite remote sensing plays an important role in wildfire detection. Methods using the brightness and temperature difference of images to determine if a has occurred are one main research directions forest fire monitoring. However, common detection algorithms mainly based on fixed threshold distinguish pixels non-wildfire pixels, which reduces applicability algorithm different space–time reg...
A high power InGaAs/GaAsP vertical-cavity surface-emitting laser and its temperature characteristics
A high power bottom-emitting InGaAs/GaAsP vertical-cavity surface-emitting laser with a large aperture (400 μm diameter) is described. The device has been fabricated by using oxidation confinement technology. The device threshold current is 610 mA, and the maximum output power is up to the watt regime (1.42 W) at room temperature (24 ◦C) with a pulse condition (pulse width of 50 μs, repetition ...
Increasing the number of cores in order to the demand of more computing power has led to increasing the processor temperature of a multi-core system. One of the main approaches for reducing temperature is the dynamic thermal management techniques. These methods divided into two classes, reactive and proactive. Proactive methods manage the processor temperature, by forecasting the temperature be...
The temperature dependence of the threshold current of InGaAsSb/AlGaAsSb compressively strained lasers is investigated by analyzing the spontaneous emission from working laser devices through a window formed in the substrate metallization and by applying high pressures. It is found that nonradiative recombination accounts for 80% of the threshold current at room temperature and is responsible f...
An in-depth understanding of the growth process of single-walled carbon nanotubes is of vital importance to the control of the yield of the material and its carbon structure. Using a nickel/silica (Ni/SiOx) catalyst, we have conducted a series of growth experiments with a chemical vapor deposition (CVD) system. We find that there is a temperature threshold in the CVD process, and if the reactio...
Temperature invariant output slope efficiency and threshold current sT0=`d in the temperature range of 5–75 °C have been measured for 1.3 μm p-doped self-organized quantum dot lasers. Similar undoped quantum dot lasers exhibit T0=69 K in the same temperature range. A self-consistent model has been employed to calculate the various radiative and nonradiative current components in p-doped and und...
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