搜索结果: 1-10 共查到“工学 emitters”相关记录10条 . 查询时间(0.064 秒)
Researchers transform slow emitters into fast light sources
Researchers transform slow emitters fast light sources
2015/11/12
Researchers from Brown University, in collaboration with colleagues from Harvard, have developed a new way to control light from phosphorescent emitters at very high speeds. The technique provides a n...
Status of Selective Emitters for p-Type c-Si Solar Cells
Solar Cell Selective Emitter Efficiency c-Si
2013/1/30
Crystalline silicon (c-Si) solar cells have the lion share in world PV market. Solar cells made from crystalline silicon have lower conversion efficiency, hence optimization of each process steps are ...
三角绕流滴灌灌水器结构设计和优化（Structural Design and Optimization of Triangle Circulation Drip Irrigation Emitters）
灌水器 三角绕流 水力性能
2010/12/28
以三角绕流滴灌灌水器结构的流道单元为研究对象，利用Pro/E软件完成灌水器造型设计，结合计算流体动力学软件Fluent 6.3模拟分析流道的水力性能，研究此类灌水器的湍流特性，揭示其内部湍流流动机理，并对流道结构进行优化。根据分析结果，通过改变外部大三角的形状与内部小三角的形状和位置，对流道单元进行结构优化，得出一种流态指数小于0.5，流道内速度分布均匀，流量在滴灌允许范围内，抗堵性能优良的三角绕...
Optoelectronic Generation of Millimeter-Wave White-Light at W-band with Very-Fast Sweeping Rate by Use of High-Power and Broadband Photonic Emitters
Photodiodes Radio frequency photonics
2015/6/4
By using photonic emitters and fast-scanning lasers at 1.55μm wavelengths, we generated very-flat spectra at 75-110GHz with a thirty times faster scanning-rate (35GHz/ms), much lower driving-voltage, ...
土壤质地对地下滴灌灌水器水力要素的影响（Effect of Different Textural Soils on Hydraulic Characteristics of Emitters under Subsurface Drip Irrigation）
地下滴灌 灌水器 土壤质地
2009/5/19
为研究不同质地土壤中灌水器水力要素的变化规律及其差异，选取灌水器工作压力、土壤容重和土壤初始含水率为因素，分别在粘土、壤土和砂土中采用混合水平均匀设计安排试验。试验结果表明，不同土壤中的灌水器出流规律一致：即当工作压力不变时，灌水器流量在灌水初期略大，而后减小并趋于恒定，这个变化过程仅1～2min；在相同压力下，地下滴灌灌水器流量比地表滴灌小5%～20%，压力越大，二者越接近；灌水器流量随工作压力...
Three-Dimensional Silicon-Germanium Nanostructures for CMOS Compatible Light Emitters and Optical Interconnects
Three-Dimensional Silicon-Germanium Nanostructures CMOS Compatible Light Emitters Optical Interconnects
2009/5/19
Three-dimensional SiGe nanostructures grown on Si (SiGe/Si) using molecular beam epitaxy or low-pressure chemical vapor deposition exhibit photoluminescence and electroluminescence in the important sp...
Determination of Hydraulic Performances of In-Line Emitters
Hydraulic Performances In-Line Emitters
2009/1/22
The efficiency of trickle irrigation systems depends directly on the uniformity with which water is discharged from the emission devices throughout the system. Ideally, all emitters in the system shou...
Development of a Mathematical Model Using Dimensional Analysis for Predicting the Friction Losses in Drip Irrigation Laterals with Cylindrical Type In-Line Emitters
Drip irrigation emitters friction loss mathematical model dimensional analysis
2009/1/13
This paper presents a prediction model developed using dimensional analysis for friction losses in drip irrigation laterals. Drip irrigation laterals with cylindrical type in-line emitters placed at d...
Determination of Hydraulic Performance of Trickle Irrigation Emitters used in Irrigation Systems in the Harran Plain
Drip irrigation in-line emitters manufacturers' coefficient of variance emitter exponent
2009/1/13
Trickle irrigation systems' efficiency depends on system uniformity, which is determined by water discharge uniformity from emitters. It is impossible to produce 2 identical emitters due to manufactu...
Determination of Hydraulic Performance of Trickle Irrigation Emitters used in Irrigation Systems in the Harran Plain
Drip irrigation in-line emitters manufacturers' coefficient of variance emitter exponent
2009/1/13
Trickle irrigation systems' efficiency depends on system uniformity, which is determined by water discharge uniformity from emitters. It is impossible to produce 2 identical emitters due to manufactur...