基于申威1600的3级BLAS GEMM函数优化

BLAS是当前科学计算领域重要的底层支持数学库之一,其中的3级BLAS函数应用最为广泛.本文基于国产申威1600平台,提出了一种基础线性代数库BLAS的三级函数通用矩阵乘GEMM的高性能实现方法.在单核上,使用乘加指令、循环展开、软件流水线指令重排、SIMD向量化运算、寄存器分块技术等与平台架构相关的技术手段,实现汇编级手工优化;在多核上,提出了适用于该平台的多线程加速方案.实验结果显示,在单核串行性能测试中,与知名开源数学库GotoBLAS相比,我们实现了平均4.72倍的加速效果;在多核并行扩展测试中,4线程版的性能则平均达到了单线程版性能的3.02倍.     

Study#$TABon#$TABsputtering#$TABZn(O,S)#$TABbuffer#$TABlayers for eco-friendly Cu(In,Ga)Se2 solar cells

An eco-friendly Zn(O,S) film with a wider band gap is emerging as one of the promising Cd-free replacement material, which can be deposited by radio frequency sputtering. The effect of sputtering pressure on the Zn(O,S) films properties and the devices performance are studied systematically. At high pressure, the ZnS phase is found in the Zn(O,S) films resulting in a higher barrier at Zn(O,S) /CIGS interface which would lead to a low recombination activation energy (Ea). By reducing sputtering pressure, single phase of Zn(O,S) films are conducive to carrier transport as well as pro- mote the films electric properties, ultimately improving the performance of Zn(O,S)/CIGS solar cells. This work has been supported by the National Natural Science Foundation of China (Nos.61774089, 51572132 and 61504067), and the Yang Fan Innovative & Entrepreneurial Research Team Project (No.2014YT02N037). E-mail:wwl@nankai.edu.cn      

浅谈现代通信技术及其发展趋势

随着科技的日益发展,通信技术已经成为一门独立的学科。特别是已步入信息时代的今天,通信技术、电子技术、计算机技术、自动控制技术和人工智能等高新技术紧密结合,广泛应用于社会的各个方面,已经成为人们生活中不可缺少的组成部分,并且在国民经济中扮演着越来越重要的角色。     

塑性混凝土防渗墙的工程设计

文章结合蝎子山水库大坝防渗加固工程实践,介绍了塑性混凝土防渗墙工程设计方法,提出了设计指标和应用中应注意的问题.     

混凝土碳化研究综述

混凝土碳化作用研究是混凝土耐久性研究的重要部分。碳化会降低混凝土的碱性,破坏钢筋表面的钝化膜,从而使混凝土对钢筋的保护作用减弱。本文从碳化机理、影响碳化的因素、碳化区的划分以及碳化对钢筋混凝土性能的影响几方面介绍了碳化对混凝土的影响。     

矿物掺合料对混凝土抗氯离子渗透性能的影响综述

混凝土的耐久性问题正得到科研界和工程界越来越广泛的关注,其中氯离子侵蚀问题成为当前混凝土耐久性研究的热点之一。矿物掺合料的掺入可显著改善混凝土的抗氯离子侵蚀性能,本文综述了近年来国内外关于矿物掺合料对混凝土抗氯离子侵蚀影响的研究进展,分析并总结了粉煤灰、高炉矿渣、硅灰掺入混凝土对混凝土抗渗性能的影响。     

动态测量精度理论研究进展与未来

对动态测量精度理论的主要研究热点问题——全系统动态测量精度理论、动态测量误差分离与修正技术、动态测量误差分解与溯源理论、动态测量精度损失诊断技术与溯源理论等进行了分析介绍,并指出它们在精度理论研究领域的发展趋势和存在的问题,为动态测量精度理论的研究和发展提供参考。     

The impact of Al2O3 back interface layer on low-temperature growth of ultrathin Cu(In,Ga)Se2 solar cells

With reducing the absorber layer thickness and processing temperature, the recombination at the back interface is severe, which both can result in the decrease of open-circuit voltage and fill factor. In this paper, we prepare Al2O3 by atomic layer deposition (ALD), and investigate the effect of its thickness on the performance of Cu(In,Ga)Se2 (CIGS) solar cell. The device recombination activation energy (EA) is increased from 1.04 eV to 1.11 eV when the thickness of Al2O3 is varied from 0 nm to 1 nm, and the height of back barrier is decreased from 48.54 meV to 38.05 meV. An efficiency of 11.57 % is achieved with 0.88-μm-thick CIGS absorber layer.     

An intelligent method to design laser resonator with particle swarm optimization algorithm

In order to design a complex laser resonator with multi-parameters, the method of particle swarm optimization (PSO) algorithm is employed. The parameters influencing the resonator stability and mode size distribution are taken into consideration, and the stability criteria index and the mode size distribution are used as target values. The absolute values of the differences between practical and the target values are set as the fitness function for the PSO. By minimizing the fitness function, a laser resonator with the optimized cavity parameters can be found. The analyses for the design example demonstrate the feasibility and validity of the PSO method in the computer aided design of multi- parameters laser resonator. Applying PSO algorithm in the intelligent design of solid state laser resonators can realize the transition from manual trial-and-error to computer intelligent design of the laser resonators.     

竖琴式转化炉管系应力分析

转化炉是合成氨、甲醇、制氢等石油化工装置中最重要的设备之一,庞大的转化炉管系使得转化炉的力学稳定性成为一个突出的问题。通过对某项目制氢装置中采用的竖琴式转化炉管系进行应力分析,得出一些规律性结论,为该类炉型的详细工程设计起到一定的指导作用。