β—型抗氧剂及其结晶制备

在C6烷烃和低级醇混合溶剂中，通过对抗氧剂1010粗品的重结晶精制，对β-型抗氧剂1010的结晶工艺以及溶剂比、质剂比、溶剂等因素进行了研究，制得了纯度高（透光率在425nm处大于97%，500nm处大于99%）、堆密度大（0.38g/cm∧3）、质量稳定的β-型抗氧剂1010。     

Adaptive modulation recognition based on the evolutionary algorithms

Nowadays, the development of classification algorithms gives the ability to improve Automatic Modulation Recognition (AMR) effectively. This paper presents a novel modulation recognition algorithm based on clustering approach. Generally, we aim to distinguish multicarrier modulation OFDM from single-carrier modulations. In this regard, two statistics of the amplitude of the received signal are calculated at the output of a quadrature mixer as key features. The extracted features of training data points are submitted to the clustering algorithm, then, centroids for single-carrier and multicarrier modulations are assessed. Afterwards, each point of testing dataset is dedicated to its nearest centroid based on Euclidian distance and the recognition is accomplished. Simulation results demonstrate that the algorithm is beneficial in a wide range from low to high SNRs.     

Conversion of recycled sawdust into high HHV and low NOx emission bio-char pellets using lignin and calcium hydroxide blended binders

Spruce wood sawdust (S), as biomass waste, could be utilized as a renewable fuel, but it suffers from its bulky, low energy density, high volatiles content and NO_x emission. This study investigated the possibility of conversion S into bio-char pellets (SC-Ps) as renewable and CO₂-neutral bio-fuel. Sawdust derived bio-char (SC) was produced through pyrolysis, and subsequently compressed into SC-Ps bonded by lignin (L) and hardened by Ca(OH)₂, NaOH, CaCl₂, CaO. The combustion characteristics of S and SC, the physical properties of SC-Ps including abrasive resistances (ARs), impact resistance index (IRI) and compress strengthens (CS) were evaluated. Results showed that the high heat value (HHV) of SC increased by 95% and its NO_x emission decreased due to the release of N-containing volatiles. Among these hardeners, addition of 5% Ca(OH)₂–10% L reduced the disruptive force created by uptake moisture and played an effect of hydration on hardening the bonds. In addition, the catalysis of hydroxide promoted the polymer chain growing into three-dimensional cross-linking that strengthened the bonds. Thus, the mechanical strengths of the SC-Ps bonded by Ca(OH)₂/L were sufficient for directly transportation and being charged into the blast furnace.     

Optimal design for sustainable bioethanol supply chain considering detailed plant performance model

The always increasing energy demand combined with the declining availability of fossil fuels is driving forces for the investigation of renewable energy sources. In this context, bioethanol is considered as one of the most appropriate solutions for short term gasoline substitution. Then, the motivation of this work is to propose a MINLP optimization model for a sustainable design and behavior analysis of sugar/ethanol supply chain (SC). A detailed model for ethanol plant design is embedded in the SC model, and therefore plant and SC designs are simultaneously obtained. Yeast production and residue recycles are taken into account in order to assess the environmental impact. The inclusion of sustainability issues in the model produces both economic and operative changes in SC and plant designs. The simultaneous optimization of these elements allows the evaluation of several compromises among design and process variables. These issues are highlighted throughout the evaluated studied cases.     

对寄生电容不灵敏的开关电容电路判据及简化的信号流图分析

本文改进了对寄生电容灵敏性的判据,列举了基本的不灵敏SC电路块及其拓扑图,提出了含反相运放、同相运放及一般的SC电路的信号流图简化分析方法。     

基于扩频载波通信的远程传感系统

利用电力线扩频载波通信技术实现对远程传感信息的监测是一种经济的方案,本文设计了基于单片机89C51和扩频载波芯片SC1128的远程传感系统方案,给出了其设计原理图和上、下位机的程序流程图.     

Software Distributed Shared Memory: a VIA‐based implementation and comparison of sequential consistency with home‐based lazy release consistency

A Distributed Shared Memory (DSM) system provides a distributed application with a shared virtual address space. This article proposes a design for implementing the DSM communication layer on top of the Virtual Interface Architecture (VIA), an industry standard for user‐level networking protocols on high‐speed clusters. User‐level communication protocols operate in user mode, thus removing the operating system kernel's overhead from the critical communication pass, and significantly diminishing communication overhead as a result. We analyze VIA's facilities and limitations in order to ascertain which implementation trade‐offs can be best applied to our development of an efficient communication substrate optimized for DSM requirements. We then implement a multithreaded version of the Home‐based Lazy Release Consistency (HLRC) protocol on top of this substrate. In addition, we compare the performance of this HLRC protocol with that of the Sequential Consistency (SC) protocol in which a Multi View (MV) memory mapping technique was used. This technique enables a fine‐grained access to shared memory, while still relying on the virtual memory hardware to track memory accesses. We perform an ‘apple‐to‐apple’ comparison on the same testbed environment and benchmark suite, and investigate the effectiveness and scalability of both protocols. Copyright © 2005 John Wiley & Sons, Ltd.     

半导体集成电路标准概述

半导体集成电路是半导体器件两大产业之一，对电子电气产业发展有着重要影响。主要介绍了半导体集成电路的产业现状。国内外相关标准概况以及标准发展动向等。     

供应链中的信息流

企业的信息方面回报（ＲＯＩ）的增加是提高企业竞争力的有效方式之一。企业要设法消除供应链各成员之间信息传递的障碍,以便减少“内耗”,使供应链各成员实现信息共享。供应链中信息的价值不是体现在信息的数量上,而是体现在对信息的强化能力上,体现在各成员从大量有用的信息中发展多少知识。     

The crippled queen placement problem

We describe the outcome of various combinations of choices made by individuals in the solution of a non-trivial combinatorial problem on a computer. The programs which result are analyzed with respect to execution speed, design time, and difficulty in debugging. The solutions obtained vary dramatically as a result of choices made in the overall design of the solution. Choices made at lower levels in the top-down tree of design choices seem to have less effect on the parameters analyzed. A tradeoff between mathematical effort in algorithm design, and program speed is evident, since some solutions required solution-time which grows exponentially with the case size, while another solution presented here gives a closed-form expression for the required answers for all large cases.