水下目标回波的块信号稀疏分解方法

基于匹配追踪的稀疏分解方法原理简单,在工程实际中应用广泛,但其计算量大,重构精度也不够理想。针对此问题,利用水下目标回波信号的块稀疏特性,提出了水下目标回波的块信号稀疏分解方法。首先基于水下目标回波和块稀疏信号的基本理论,结合回波信号仿真结果,分析了水下目标回波信号的块稀疏特性;然后,充分考虑回波信号本身的稀疏结构,利用信号分块和原子分块的思想,针对水下目标回波提出了块信号的稀疏分解和块匹配追踪重构算法,并从理论上对其计算复杂度进行了分析;最后,采用仿真实验的方式,与传统方法进行对比。结果表明,该方法大大减少了计算量,提高了重构精度。     

Fertigung einer universellen Hüftprothesenpfanne mittels Hochdruckblechumformung

In recent years, the use of hip prostheses has become a routine procedure. The use of total hip replacement has evolved in recent years to a routine procedure. Despite this experience, it always comes back to complications. Especially the migration or loosening of the acetabular component because of the artificial load adaptive bone remodeling is still a current problem. This is due to the changing mechanical situation after the implantation of the prosthesis. Another problem is the high bone loss during implantation, which complicates a revision of the prosthesis. One solution is the use of patient‐specific prostheses. So far, the use of these prostheses is limited due to the time‐consuming and cost‐intensive production. The overall objective of the presented project in this publication is the development and establishment of an innovative concept for the production of patient‐specific hip prosthesis made of titanium plates by sheet metal forming. The idea of this concept involves the development of a two‐stage process. First of all a standardized hip prosthesis is made by high‐pressure sheet metal forming and then individually in the second step. This publication contains the derivation of the standard prosthesis. For this purpose, a design methodology was generated, based on the so‐called agglomerative clustering. In addition, presents the results of the numerical preliminary design of the first stage of the process and the tool developed concept in the course of this paper.     

破碎复合型难采矿体安全高效采矿方法优化研究

根据太平铁矿地下涌水量大、矿岩松散软破的复合型难采现状,在"安全、经济、高效"的原则下,对矿山原有的上向水平分层充填采矿法的多个工艺环节进行优化设计,采用简单灵活的盘区上向进路式水平分层尾砂胶结充填采矿法,能根据矿体的具体分布形态有针对性地完成回采,使矿石回收率提高5%~10%;减小了空区暴露面积,有利于顶板维护和管理,极大地提高采矿作业的安全性;用生产效率更高的铲运机代替了落后的电耙出矿方式,使矿块生产能力提高了30~70t/d;同时,贫化率降低了6.31%,较好地发挥了矿产资源的经济效益、社会效益、环境效益。     

电视播出系统网络信息与数据安全

本文介绍了南京广电集团电视播出系统网络信息与数据安全项目建设情况。新建立的聚合、冗余高速交换网络体系及安全防御体系基于模块化,易管理、可扩展,并引用无单点故障的NAS方案,配合升级改造后的灾备系统,实现与新播出网络的无缝连接,为向全台网和新媒体外延埋好了伏笔。     

延迟焦化装置放空冷却系统存在问题及对策

某1 Mt/a延迟焦化装置放空冷却系统采用闭式塔内冷却技术,运行过程中出现外甩污油量大、不凝气外排造成全厂火炬系统负荷较大、放空塔顶含硫污水含油率过高造成酸性水汽提装置换热器结垢等问题,同时对延迟焦化装置提出回炼全厂污油的要求.为解决以上问题,装置停工检修过程中对放空冷却系统进行改造,主要内容为:增加放空塔底加热器;增加污油至焦炭塔顶大油气管线做急冷油管线;增加破乳剂注入及不凝气回收系统.改造后可实现该装置自产污油及全厂污油做焦炭塔顶急冷油、放空塔顶酸性水满足酸性水汽提装置进料要求及年回收约2 000 t不凝气等,实现了环保及经济效益的综合效果.     

H3PW12O40-TiO2/膨润土光催化降解甲基橙的催化性能

通过溶胶凝胶制得H3PW12O40Ti(OH)4凝胶,并柱撑于膨润土层间制备了复合光催化剂H3PW12O40TiO2/膨润土。由XRD、SEM、EDS对制备的复合光催化剂进行表征测试表明,固载的H3PW12O40TiO2使膨润土层状结构发生明显变化,柱撑体H3PW12O40TiO2呈弥散状态,且TiO2为锐钛结构,催化剂为颗粒粒径大小不一、分布松散的复合材料。对甲基橙的H3PW12O40TiO2/膨润土光催化降解应用表明,掺杂的杂多酸使所制备的复合催化剂光催化活性得到了极大提高,在光催化体系下有较广的pH适应范围,且制备的催化剂具有良好的催化稳定性。在表征分析及应用实验的基础上,提出了H3PW12O40TiO2/膨润土的强化催化作用原理。     

复合型热泵在商住楼中的应用

针对商住楼,提出了一种复合型热泵系统。在夏季,该系统给室内供冷的同时利用热回收制备生活热水,在环境温度较高时,利用生活给水带走一部分冷凝热;在冬季,该系统既可以制备生活热水,也能给室内供热,在环境温度较低时,利用消防水池的水作为热源,实现了设备本身和建筑物内水资源的充分利用,从而保证热泵常年都有较高的能效值。     

Dynamic behavior of a distributed incinerator power system under output power variation

In Taiwan, the sales revenues of power generation from incinerator power plants with heat recovery power generation sold to the power company were up to NT$4.5bn, making the incinerator power generation play an important role in reduction of impact on environment and substitution of energy in power generation. Studying the dynamic behavior of incinerator power systems under output power variation is thus an essential task for the scheduling, operation, and expansion of incinerator power plants, such as, for cooperating with a scheduling program based on pricing signals to capture energy trading timing economically and to operate the incinerator power system securely. Although there are many studies on incinerator power generation, they seldom discuss the power generation system characteristics. In this paper, mathematical dynamic models for a distributed incinerator power system were derived and implemented using Matlab/Simulink, and dynamic characteristics of the system were further simulated and discussed under two operating modes: increment and decrement of power generation. These developed models can provide dynamic characteristics for these two modes, serving as an important analytic tool for cooperating with a scheduling program based on pricing signals to capture energy trading timing economically and to operate the incinerator power system securely. Copyright © 2014 John Wiley & Sons, Ltd.     

An advanced VHDL‐AMS PiN diode model: towards simulation‐based design of power converters

This paper focuses on the modeling of a power PiN diode. The focal point basis is the dependence on temperature. The PiN diode remains a difficult device to model mainly during switching transients. An advanced PiN diode temperature‐dependent model is developed and implemented in VHDL‐AMS. Heterogeneous simulation scheme including the circuit wiring parasitic components, the probe effects and the dependent diode models is successfully simulated using SIMPLORER simulator. Experimental data of several commercial PiN diodes are compared to simulation results at different temperature levels. A good rate of consistency is found. Copyright © 2014 John Wiley & Sons, Ltd.     

排风热回收应用于热风采暖的经济性分析

介绍排风热回收应用于厂房热风采暖的必要性及工作原理,对比各种热回收装置的特点,通过工程实例,介绍排风热回收装置在热风采暖上的系统设计及设计选型,并根据当地的气象条件对排风热回收在热风采暖上应用的运行费用进行逐时计算和经济性分析。