C语言指针和汇编语言间接寻址的关系探讨——从存储空间图的视角加以分析

C语言是一门面向用户的过程语言,指针是该语言中最为灵活的一部分.汇编语言是一门面向处理器的过程语言,该语言中没有指针的明确定义,但指针的概念却随处可见.本文通过间接寻址方式引出指针在汇编语言中的应用,借助存储空间图深入探悉C语言中的指针和汇编语言中的间接寻址的密切关系,用一个全新的概念更好的去理解指针在这两门语言中的应用和联系.     

Indirect adaptive control of nonlinear dynamic systems using self recurrent wavelet neural networks via adaptive learning rates

This paper proposes an indirect adaptive control method using self recurrent wavelet neural networks (SRWNNs) for dynamic systems. The architecture of the SRWNN is a modified model of the wavelet neural network (WNN). However, unlike the WNN, since a mother wavelet layer of the SRWNN is composed of self-feedback neurons, the SRWNN can store the past information of wavelets. In the proposed control architecture, two SRWNNs are used as both an identifier and a controller. The SRWNN identifier approximates dynamic systems and provides the SRWNN controller with information about the system sensitivity. The gradient-descent method using adaptive learning rates (ALRs) is applied to train all weights of the SRWNN. The ALRs are derived from discrete Lyapunov stability theorem, which are applied to guarantee the convergence of the proposed control system. Finally, we perform some simulations to verify the effectiveness of the proposed control scheme.     

高性能主轴变频器的设计和实现

本文详细介绍了一种基于DSP的全数字主轴电机变频器的设计方案，并且给出了～系列的优化策略以提高系统性能。为了保证主轴电机响应的快速性和运转的平稳性，系统采用了间接矢量控制策略，考虑到该控制策略对于电机参数有一定的依赖性，因此采用离线辨识的方法来获取控制所需的电机参孰为了便于全数字化系统的实现，以及提高母线电压的利用率，系统采用了改进的空间矢量脉宽调制策略；为了提高主轴电机在弱磁区的带载能力，以及延长主轴电机恒功率运转的区间，系统采用了电压最大化利用的优化弱磁控制策略。最后，给出了依据本方案设计的主轴变频器的试验结果。结果证明了本方案是可行的，达到了预期目标。     

Experimental Investigation of Wire Arrangements for Narrow-Gap Triple-Wire Gas Indirect Arc Welding

A new narrow-gap welding process is proposed by applying triple-wire gas indirect arc (TW-GIA). There are double power supplies and triple wires in this system. Power supplies are only connected between electrode wires and base materials are not linked to power supplies. Since there are different wire arrangements with TW-GIA, this article studies these wire arrangements and their effects on sidewall fusion for narrow-gap welding. Results show that different wire arrangements lead to variant arc behaviors and metal transfer, and consequently they lead to different situation of sidewall fusion. The heat to melt sidewalls is mainly from the indirect arc column and metal transfer with narrow-gap TW-GIA. When side wires deviate from the main wire to opposite directions, heat from arc columns and metal transfer can concentrate toward groove sidewalls. When the whole weld torch is lowered, heat from the indirect arc column and metal transfer increases at the weld bead root.     

Temperature dependence of the optical transitions in CdTe thin film – Investigation with photoresponse spectra

The CdTe thin films have been prepared by electrochemical method from a bath solution containing cadmium sulfate and tellurium dioxide. Schottky devices of the type Au/CdTe were prepared and the spectral response of the device has been investigated. The direct and indirect transitions in the 1.3–1.6 eV region were calculated from the normalized spectral response data. The temperature dependence of the band gap have been investigated and correlated with the theory. The band gap of CdTe at absolute zero temperature is estimated as 1.61 eV and that the rate of change of E_g with temperature is calculated as −0.4 meV/K. The 1.407 eV indirect transition involves a trap level near the conduction band edge. The indirect transition also exhibits temperature dependence.     

推力矢量飞机间接自适应飞行重构控制系统研究

文中根据间接自适应算法提出了一种可用于推力矢量飞机的新型控制系统结构，同时将自修复功能融入其中。应用这种控制系统对推力矢量飞机在单舵面故障情况下飞行情况进行了仿真，结果说明此新型飞控系统对故障具有极强的鲁棒性和重构性能。     

干燥工况下新型复合式露点间接蒸发冷却空调机组的试验研究

在福州某模拟机房模拟干燥工况(干球温度29~35℃,湿球温度18~23℃)下,通过对新型复合式露点间接蒸发冷却空调机组进行试验测试,结果表明:最佳二/一次风量比为0.72,最佳淋水量为450L/h,22.5℃循环水对应的湿球效率为115%,16℃自来水对应的湿球效率为121%。机组在最佳工况下运行30min需要消耗2.62L的水。     

油气管道泄漏检测方法的研究及运用

目前,管道运输方式已被广泛应用到油气运输领域,且表现出显著的节能性、高效性及安全性。但管道运输过程,极易受到第三方或人为的破坏,从而导致管道泄漏或破裂,甚至引发严重的爆炸或火灾事故,从而给周边人员的安全造成严重威胁。可见,重视油气管道泄漏检测非常必要,以便对存在的险情进行及时排查。结合实践经验,就油气管道泄漏检测方法的应用进行了研究讨论。     

Effectiveness of indirect evaporative cooling and thermal mass in a hot arid climate

In this paper, we compare results of a long-term temperature monitoring in a building with high thermal mass to indoor temperature predictions of a second building that uses an indirect evaporative cooling system as a means of passive cooling (Vivienda Bioclimática Prototipo -VBP-1), for the climatic conditions of Sde Boqer, Negev region of Israel (local latitude 30°52′N, longitude 34°46′E, approximately 480 m above sea level). The high-mass building was monitored from January through September 2006 and belongs to a student dormitory complex located at the Sde Boqer Campus of Ben-Gurion University. VBP-1 was designed and built in Maracaibo, Venezuela (latitude 10°34′N, longitude 71°44′W, elevation 66 m above sea level) and had its indoor air temperatures, below and above a shaded roof pond, as well as the pond temperature monitored from February to September 2006. Formulas were developed for the VBP-1, based on part of the whole monitoring period, which represent the measured daily indoor maximum, average and minimum temperatures. The formulas were then validated against measurements taken independently in different time periods. The developed formulas were here used for estimating the building's thermal and energy performance at the climate of Sde Boqer, allowing a comparison of two different strategies: indirect evaporative cooling and the use of thermal mass.