试谈水泥搅拌桩在高速公路软基处理中的应用

论文首先探讨了国内外常见软基处理技术理论、实施工艺、适用条件等。论文结合浙江台州高速公路某段的软基处理,对该道路的处理方法及施工工艺进行研究。该工程进行软土地基处理后,地基的地质条件均能满足工程的要求,通过实践证明该软基处理是十分成功的。保证软土路基施工的质量和预防重大事故的发生。     

检测与数控技术在种子静电处理系统中的应用

利用高压静电场处理植物种子,可以改变其某些生理特征,从而提高农作物产量,本文在介绍了高压静电场种子处理技术的基础上,研究了有效提高处理效果和精度的改进措施,并研制了基于DSP的数控型实验装置,该装置不仅实现了高压静电场的精确调节和控制,而且能够自动完成对种子处理的全过程,从而全面提升了高压静电场种子处理的技术水平,利用该装置处理后,种子的生理活性可以得到有效改善,为提高农业效益打下了良好的基础。     

铝及其合金的表面处理技术

介绍了铝及其合金表面处理的各种方法，详细介绍了阳极氧化及着色处理，并对该领域目前研究的热门课题－－微弧氧化及激光处理 进行了介绍。作者指出，随着处理方法不断改进和创新，其将有更广阔的应用前景。     

模基水声信号处理技术的研究现状和展望

常规信号处理方法的前提条件相对简单,不能满足水声信号处理中海洋环境非平稳和极低信噪比等实际情况。基于模型的信号处理方法(模基处理技术)能够将物理模型引入到信号处理算法中,并且能够有效利用先验信息提高信号处理的性能,是一种有潜力的信号处理技术。结合多年的模基水声信号处理研究基础,首先介绍了模基处理的基本概念,然后介绍了模基处理器的基本框架和其主要优势,进而对模基技术在水声信号处理各个应用领域的研究现状做了全面的归纳和简要的评述,在此基础上,分析了该领域进一步的研究方向。     

电渗析法浓缩回收稀土矿铵盐废液

介绍了采用离子交换膜电渗析法对硫酸铵废水进行浓缩回收的研究 .对诸多影响电渗析法浓缩和脱盐效果的工艺参数进行了试验研究 .结果表明 ,采用该法浓缩处理稀土矿铵盐废水是一条颇有前途的新型处理方法 .     

制备氰化亚铜治理高浓度含氰废水

本文研究了制备氰化亚铜法处理高浓度含氰废水工艺及反应机理,并对氰化亚铜法处理高浓度含氰废水的处理方法、处理条件、处理效果进行探讨,得出该处理方法具有设备简单、无需加热、处理能耗低、资源重复利用、消除二次污染等特点。     

基于CORDIC算法的单频激光干涉信号处理系统半波长误差分析与消除

为了满足纳米级分辨率和高速处理,设计了基于CORDIC算法的激光干涉信号处理系统。研究发现信号处理系统存在半波长大小的粗大误差。对该半波长误差的特点与形成机理进行了研究,研究表明该半波长误差的根源为小数相位测量存在一定的误差区间,在干涉信号相位零点附近,该误差区间导致小数相位处于［2π^-,0⁺］,具有不确定性;与整数相位结合时,可能产生半波长误差。在对半波长误差深入研究的基础上,给出修正表,提出了基于CORDIC算法相位补偿技术,以消除半波长粗大误差对激光干涉测量系统的影响。实验结果表明:在信号处理系统中,该相位补偿技术能够有效地消除半波长粗大误差,由CORDIC算法引入的总量化误差小于±0.05nm。     

H13热作模具钢激光表面改性处理技术

介绍了H13热作模具钢的激光表面改性处理技术,分析了激光相变硬化、激光表面熔凝、激光合金化、激光冲击硬化等表面处理的特点及应用,研究了表面激光处理工艺的影响因素,以及激光在模具表面处理中的应用.讨论了表面激光改性处理存在的问题,提出了该领域的研究方向.     

水泥混凝土路面厚度、强度超声检测方法

该文研究了水泥混凝土路面厚度和强度超声检测中的信号处理方法,设计了宽带换能器,提出了水耦合法和声时综合处理法。现场检测试验证明,该系统可明显提高检测效率,厚度测量精度优于5%,强度测量精度优于7%。     

基于Labview和Matlab的多普勒信号的处理

研究了对激光多普勒信号的处理方法,利用Labview和Matlab软件的强大信号处理功能,对采集的多普勒信号进行小波滤波,并经过时频分析,得到被测器件的运动参量(速度、位移、加速度).与其它处理方法相比,该方法有效地提高了整个软件处理系统的分辨率和测量精度.     

Plastic processing

This issue is devoted to close-to-form forming methods; it is important not to forget that the primary reason for the attractiveness of plastics in many applications is the ability to achieve near-net-shape in one operation.     

Reduced processing element architecture for parallel local image processing

Abstract

The object of this paper is to propose new architecture which can reduce the number of processing elements for parallel local image processing under the premise of real‐time performance. For large‐sized local image processing, this architecture will save much space as it is suitable for being designed into VLSI chip. For example, the traditional parallel architecture will use 9 PEs for a 3×3 convolution, while the Reduced Processing Element Architecture (RPEA) only requires 2 PEs to achieve the real‐time performance.     

Refrigeration demands for meat processing

The meat exporting industry in New Zealand is the largest user of refrigeration, and thus it is necessary to know how efficient it is in the use of energy.

The equipment of a large meat works is described, and the operation of the plant has been analysed thermodynamically. This indicated a number of ways by which substantial improvements in efficiency, and saving of energy, can be attained.     

Semisolid processing of metallic materials

Abstract

Semisolid processing involves forming metallic alloys between the solidus and the liquidus. For the process to operate, the microstructure must consist of solid spheroids in the liquid matrix, rather than dendrites. The material then flows when it is sheared but thickens again when allowed to stand, i.e. it behaves thixotropically. This type of behaviour was first discovered by Flemings and co-workers in the 1970s and is utilised in a family of processes, some now applied commercially. Here, the current status of semisolid processing, both technologically and from a research point of view, will be reviewed.     

Discussion of the standard processing time

The input-weighted average standard processing time for a multi-item machine is discussed in this paper. For practical purposes it is important to have a short average processing time. It is shown that the input-weighted average processing time does not depend on the scheduling, sequencing and lot-sizing; it is only influenced by the total input and by the individual standard processing times. Furthermore, the relationship between the individual standard processing time and the average standard processing time is investigated. It is proven that the input-weighted average standard processing time is a convex function of the standard processing time of one certain item. An interesting consequence of the convexity is the fact that a decrease of the standard processing time of an item with a standard processing time less than half of the input-weighted average standard processing time causes an increase of the input-weighted average processing time.     

Managing photons for quantum information processing

We study distinguishing information in the context of photonic quantum interference tailored for practical implementations of quantum information processing schemes. In particular, we consider the character of single-photon states optimized for multiple-source interference experiments and for experiments relying on Bell-state measurement and arrive at specific design criteria for photons produced by parametric down-conversion. Such states can be realistically implemented with available technology. We describe a novel method for characterizing the mode structure of single photons, and demonstrate it in the context of coherent light.     

Thermal plasmas in material processing

Thermal plasmas are partially ionized gases at atmospheric pressures, characterized by temperatures in the range of 2000–20,000 K and charged particle number densities in the range of 10¹⁹–10²¹ per m³. Thermal plasmas are produced by plasma torches as a highly constricted jet. The high temperatures, enthalpies and heat fluxes in the plasma jet make it amenable to many chemical and metallurgical processes of industrial importance. The processing environment can be inert as in the case of argon or nitrogen plasmas or can be made reactive by introducing suitable gases. Reactive thermal plasma processing is a novel technique, wherein the plasma enters the reaction scheme, with ions and excited species opening up new channels. This technique is versatile in producing a wide variety of materials like oxides, carbides, borides, aluminides and coatings of diamond, superconductors and bioceramics. In this paper, the basic design of the plasma devices and some of the significant materials-related activities carried out recently at BARC are reported.     

Laser etching and dry processing

Controlled, anisotropic etching of different materials commonly used in microelectronics is an important processing step in microfabrications. During recent years it has been demonstrated that lasers can be used for initiating and enhancing the etching process in many gas-solid (dry processing) and liquid-solid (wet processing) systems. The laser-induced reaction could be either photochemical or thermochemical. Using laser etching technique a variety of materials such as Al, Ta, Ni/Fe, GaAs, InP, Si, SiO₂ mylar, different polymers and superconducting materials have been processed. In this paper we briefly review these laser etching experiments.     

Acousto-optic cyclostationary signal processing

Cyclostationary signal-processing techniques implemented by means of acousto-optics are considered. Cyclic-processing methods are reviewed and motivated, such as the cyclic correlation and the cyclic spectrum. It is shown that the cyclic correlation can be computed at cycle frequencies of interest by use of one-dimensional time-integrating correlators in additive or multiplicative configurations. Detection of cycle frequencies is briefly considered, and a one-dimensional acousto-optic spectrum-analysis approach is described that is effective for amplitude-modulated signals. The problem of computing the two-dimensional cyclic correlation for all cycle frequencies and lags is then considered. This is accomplished by means of an acousto-optic triple-product processor configured in a manner similar to that used for ambiguity-function generation. The cyclic spectrum can be obtained in a postprocessing step by Fourier transformation of the cyclic correlation in one dimension. Higher-order extensions of the cyclic correlation are also discussed, and it is shown how a two-dimensional slice of the three-dimensional cyclic triple correlation can be computed by use of an acousto-optic four-product processor.     

Interactive teaching of adaptive signal processing

Over the last 30 years, adaptive digital signal processing has progressed from being a topic for a strictly graduate-level advanced class in signal processing theory to one that is part of the core curriculum for many undergraduate classes in signal processing. The key reason is the continued advance of communications technology, with its need for echo control and equalisation, and the widespread use of adaptive filters in audio, biomedical, and control applications. This paper reviews the basic theory and applications of adaptive signal processing and also presents information on multimedia teaching methods that are being used on a 24 hour course module on adaptive signal processing. In particular it presents some recent World Wide Web Java programs that were developed for teaching and self-study. Information is provided on how to download and run the Java applet