探讨网络互联对嵌入式微控制器结构的影响

嵌入式控制系统正在迅速向基于CAN、802.14.5、以太网和其它网络协议的嵌入式控制网络转变。这些嵌入式网络常常通过企业内联网、外联网或互联网等与其它网络连接。随着连接性的增加,嵌入式微处理器(MCU)的结构将面临安全和带宽的问题。嵌入式系统朝着嵌入式网络的趋势发展从根     

德国迪林根ROGESA钢铁公司2号烧结机EFA(R)烟气处理系统及其运转情况

多年来,环境保护一直是烧结行业的一个重要课题.由于政府部门提出了更加严格的要求,烧结厂废气的进一步净化已经变得很有必要.一套新开发的、工业化的EFA(曳流吸收塔)烟气处理系统于2006年年中在ROGESA钢铁公司投入运行.本文就该系统的工艺流程、特点及运行情况作一介绍.     

面向智能制造的数字化检测车间构建关键技术

数字化车间是将智能识别技术与柔性制造技术、生产组织系统以及其他管理系统的信息进行高度集成,构成具有自动化性质和综合信息流的集成制造系统。针对国内航空发动机零部件检测车间相关设施不完备、数字化程度不高的问题,研究数字化检测车间的构建需求,提出面向智能制造的数字化检测车间总体架构和构建的关键技术,为相关企业规划和建设数字化检测车间提供可参考的方向和依据。     

A new method for reducing the power consumption of portablehandsets in TDMA mobile systems: conditional equalization

In time-division multiple-access (TDMA) systems, the autonomy of portable handsets is a major constraint. We propose a new method, conditional equalization, which minimizes the power consumption due to equalization by equalizing only when it is most needed. At each time slot, the receiver estimates the need for equalization with a deterministic criterion. The proposed criteria use thresholds, chosen to provide a compromise between loss in performance and percentage of saved equalization. The performance of our method is theoretically analyzed for two-path Rayleigh fading channels and simulated for the recommended COST 207 channels. Conditional equalization can ensure a degradation in the average signal-to-noise ratio (SNR), providing a fixed bit error rate (BER with an average SNR=9 dB with systematic equalization), of less than 0.5 dB while providing a gain of 43% spared equalization for bad urban (BU), 62% for hilly terrain (HT), 79% for typical urban (TU), and 98% for rural area (RA) models, respectively. Conditional equalization is shown to greatly improve the autonomy of the receiver by drastically reducing the power consumption due to equalization, without a noticeable loss in the performance     

Brazing of UNS S32101 and UNS S32304 lean duplex stainless steels and UNS S32750 super duplex with AWS A5.3 BNi-7 (Ni–Cr–P) filler metal

Summary

Weld metals solidified in the ferritic-austenitic solidification mode (FA mode) have dual phases of ferrite and austenite in their as-solidified condition, where ferrite exhibits different morphologies depending on the chemical composition and welding conditions. This paper describes an investigation of the effect of the solidification and transformation sequence on the formation of final ferrite morphologies. Austenite is formed through either a eutectic reaction or peritectic reaction at the dendrite boundaries after the primary formation of ferrite. During the eutectic formation of austenite, the <100>_δ direction of the primary ferrite and the <100>_γ direction of the eutectic austenite are parallel to each other and lie along the growth direction of the primary dendrites. However, any specific lattice plane relationship between the two phases is not identified. During cooling after solidification, the austenite extends into the primary ferrite via solid-state transformation, and the final morphology of the ferrite is vermicular without any coherent orientation relationship between the primary ferrite and eutectic austenite. During peritectic formation of austenite, the Kurdjumov-Sachs orientation relationship is established between the primary ferrite and peritectic austenite, and the <100>_γ direction of the peritectic austenite is not parallel to the growth direction of the primary dendrites. During cooling after solidification, the primary ferrite transforms into austenite, and the final morphology of the ferrite is lathy, since the primary ferrite and peritectic austenite have a favourable coherent orientation.     

Optical communication and fiber design

Optical fiber has evolved from a not-so-transparent glass tube to an extraordinarily efficient transmission medium. It is now acknowledged as a central element of modern telecommunication being part of the whole optimization process to further improve transmission system performance and cost. In this paper, we briefly introduce transmission system optimization problematics as well as key fiber characteristics. We then review the elements of fiber design for optimized optical communication networks, including metropolitan, long and ultra-long haul applications and show how fibers have evolved over the last ten years to keep pace with more and more demanding requirement of transmission system.     

MPIC: A High-Throughput Analytical Method for Multiple DNA Targets

We describe the development of a novel combined approach for high-throughput analysis of multiple DNA targets based on multiplex Microdroplet PCR Implemented Capillary gel electrophoresis (MPIC), a two-step PCR amplification strategy. In the first step, the multiple target DNAs are preamplified using bipartite primers attached with universal tail sequences on their 5'-ends. Then, the preamplified templates are compartmentalized individually in the microdroplet of the PCR system, and multiple targets can be amplified in parallel, employing primers targeting their universal sequences. Subsequently, the resulting multiple products are analyzed by capillary gel electrophoresis (CGE). Using genetically modified organism (GMO) analysis as a model, 24 DNA targets can be simultaneously detected with a relative limit of detection of 0.1% (w/w) and absolute limit of detection of 39 target DNA copies. The described system provides a promising alternative for high-throughput analysis of multiple DNA targets.     

Fluctuat nec mergitur or what happened to Reikian psychoanalysis?

Although Theodor Reik was a celebrated psychoanalyst during the 1950s and 1960s, his work has not resulted in the development of a specific psychoanalytic tradition, and his name has gradually disappeared from Western cultural memory. Following the mode of argumentation of the reductio ad absurdum, the author critically examines six possible explanations for this remarkable observation, thereby drawing on published materials and archival sources relating to the life and works of Reik. Once these explanations have been discarded, the author argues that the main reason for the absence of a Reikian tradition within psychoanalysis stems from Reik's belief in the analytic virtue of intellectual independence. This belief may have contributed to his own departure from the psychoanalytic training institution that he helped to create, yet it also implies that Reikian psychoanalysis somehow lives on in all those practitioners who do not seek to affiliate with a doctrinal school of thought. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Le passage des opérations concrètes aux opérations formelles: Une étude des séquences de développement des notions de proportion et d'arrangement, considérées dans des univers de tache et de contenu variés.

Discusses variables affecting performance at the level of formal operations. A new method, sequence analysis, was developed to examine all relations between item success and failure. Sequence analysis replaces Piaget's notion of the "structure of the ensemble" with the notion of "level of functioning." It is concluded that this new construct allows a more accurate interpretation of individual differences concerning the special characteristics of the skills in question. (English abstract) (26 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)