Continuous-wave operation of 1.30μm GaAsSb/GaAs VCSELs

1.30 μm VCSELs using GaAsSb quantum wells, which operate continuous-wave at and above room temperature (RT), are reported. A threshold current as low as 1.2 mA at RT and a maximum CW operating temperature of 70°C are demonstrated     

Low-threshold operation of 1.3-μm GaAsSb quantum-well lasersdirectly grown on GaAs substrates

GaAsSb quantum-well (QW) edge-emitting lasers grown on GaAs substrates were demonstrated. The optical quality of the QW was improved by optimizing the growth conditions and introducing a multi-QW to increase the gain. As a result, 1.27-μm lasing of a GaAs_0.66 Sb_0.34-GaAs double-QW laser was obtained with a low-threshold current density of 440 A/cm², which is comparable to that in conventional InP-based long-wavelength lasers. 1.30 μm lasing with a threshold current density of 770 A/cm² was also obtained by increasing the antimony content to 0.36. GaAsSb QW was found to be a suitable material for use in the active layer of a 1.3-μm vertical-cavity surface-emitting lasers     

The problem of motion correction with Gaussian communications channel

A problem of correction of motion of a multistep linear controlled system under mixed perturbations is considered. It is supposed that the a center observes and controls the system; the center is connected to the system with a noisy communications channel. The influence of communications constraints on parameters of motion correction is studied. Formulae for error of reconstruction of a transient vector and optimal value of quality functional are obtained. A series of results is illustrated by an example.     

Development and application of application-specific FPGA-based processor for solving bioinformatics problems

An approach to solving large resource-consuming problems is proposed based on the application of field-programmable gate array (FPGA) microchips. This approach is demonstrated for application to the problems of searching for common motifs in genetic sequences of regulatory regions of various genes. Due to the high degree of parallelization and high transmission capacity of the internal memory in the employed FPGA crystal, a 60-fold increase in performance was achieved in solving this problem compared to a system based on the CUDA technology and about a 2000-fold increase compared to a personal computer.     

Results of experimental studies of the thermohydraulic processes during condensation of superheated steam inside an inclined tube

This article presents new results of an experimental study of the process of condensation of superheated water vapor inside inclined tubes as applied to air-cooled condensers of steam-turbine plants.     

雪莲果低聚果糖提取物的树脂脱色工艺条件优化

探讨了D941、D318、DM-2、860021四种树脂对雪莲果中低聚果糖提取液的脱色情况,采用静态吸附法确定了D318树脂脱色效果最佳,优化了脱色工艺,最优脱色工艺条件为：树脂用量为3.4%,pH为5,脱色时间为3 h,脱色温度为50℃,透光率达到90%以上。     

JGC-30型称重给煤机在混喷输煤系统中的应用

天铁动力厂在高炉送煤粉混喷改造工程中,输煤系统新装3台JGC-30型称重给煤机,结合其实际应用情况,介绍了称重给煤机的工作原理及控制系统。阐述了如何通过变频器及PLC精确控制皮带输送恒质给料,从而达到最佳配比实现节能环保,提高经济效益。     

Assessment and applications of wind energy in Jordan

A technical and economic assessment has been made of the generation of electricity using windmills located at three most promising potential wind sites in Jordan: Ras Muneef (RA), Mafraq (MF), and Aqaba (AQ). The assessment was made for two different systems, one using a relatively large single windmill and the other using 25 small windmills arranged in a wind farm. The power output of each system at each site was determined, and the electricity-generating costs in each case were also determined and compared with the generating costs of generating electricity using steam or gas turbines, furnished by the Jordanian Electricity Authority (JEA).Finally, the possibility of water pumping from 30-m and 100-m deep wells using a windmill is investigated and the quantities of water pumping from these depths at each of the three sites are given.     

基于深度学习的三维模型检索算法综述

近年来,深度学习被广泛应用于各个领域并取得了显著的进展,如何利用深度学习高效管理呈爆炸式增长的三维模型一直是一个研究热点.本文介绍了发展至今主流的基于深度学习的三维模型检索算法,并根据实验得出的算法性能评估分析了其优缺点.根据检索任务的不同,可将主要的三维模型检索算法分为两类:(1)基于模型的三维模型检索方法,即检索对...