木质素磺酸盐制取香兰素的氧化反应

本文对亚硫酸盐木材纸浆废液中的木质素磺酸盐在碱性、空气氧化反应中对氢氧化钠、香兰素和碳酸钠的浓度变化规律进行了分析。对于固形物浓度为20%、28%和35%的废液,氢氧化钠加入量的合理范围分别80～110,95～140和110～160g/L。在废液固形物浓度28%、表压1.44MPa、180℃、空气体积流速3L/L·min 的条件下,香兰素的产量为10.8～14.3g/L,香兰素对木质素的得率为7.6～10.0%,反应时间为50min。     

Patchwise scaling method for content-aware image resizing

Image resizing becomes more and more important in content-aware image displaying. This paper proposes a patchwise scaling method to resize an image to emphasize the important areas and preserve the globally visual effect (smoothness, coherence and integrity). This method for resizing image is based on optimizing the image distance presented in this paper. The image distance is defined based on so-called local bidirectional similarity measurement and smoothness measurement to quantify the quality of resizing outputs. The original image is divided into small important patches and unimportant patches based on an important map. The important map is generated automatically using a novel combination of image edge and saliency measurement. A scaling factor is computed for each small patch. The resized image is produced by iteratively optimizing, which is based on our image distance, the scaling factor for each small patch. Experiments of different type images demonstrate that our method can be effectively used in image processing applications to locally shrink and enlarge important areas while preserving image quality.     

Reversible data hiding based on hybrid prediction and interleaving histogram modification with single seed pixel recovery

This paper proposes a reversible data hiding scheme for natural images. A hybrid prediction mechanism is utilized in order to produce prediction errors as many as possible. The cover image excluding a seed pixel is partitioned into four non-overlapping segments, and four predictors are tailored for each of them. As a result, most prediction errors concentrate around zero in prediction error histogram. Besides, an interleaving histogram modification mechanism is presented such that the capacity is enhanced and easier to be finely tuned in contrast to some previous approaches. Third, a single seed pixel recovery strategy is introduced. Experimental results show the effectiveness of the proposed method.     

一种简化的非相干迭代译码算法

给出了简化的软输出非相干最大后验概率算法和相应的迭代译码算法,仿真结果表明,该算法比传统的差分检测性能优越1．5dB。     

一种导弹隔热层内传热计算的近似方法

为导弹用隔热层的设计提供了一个理论模型.这个模型在隔热层材料的选择及厚度的优化上经常用到.导弹内隔热层采用了单隔热材料的结构.在做出一定的假设后, 问题可简化为一维非稳态导热.采用了有限差分法对导热微分方程进行求解, 并对热导率假设前后的计算结果进行比较.结果表明这种方法是合理的, 且大大简化了计算过程, 这为类似的工程计算提供了一种很好的计算方法.     

手机业治安防范综合信息管理系统的研究

随着网络技术的迅猛发展和Internet的普及，网络应用正在延伸到社会的各个领域。传统的信息管理系统也向采用浏览器与客户端应用程序并存形式过渡。“手机业治安防范综合信息管理系统”根据当前公安部门对手机业治安管理需要，以互联网为基础、并具有信息采集、传递、分析和存储等功能于一体的综合治安信息管理系统，本文介绍了手机业治安防范综合信息管理系统开发的目的及功能实现方案。     

一种WCDMA系统下行信道频偏估计算法及其性能分析

文章在深入研究WCDMA下行链路的信道结构及接收信号处理流程基础上,提出了一种在Rake接收机中,通过对P-CPICH（主公共导频信道）序列两次相关检测实现频偏估计的算法;同时,对该算法主要性能指标进行了分析及仿真,验证了算法的可行性。     

UTRAN结构演进的研究

本文介绍了基于无线功能新实现点、基于分离RNC(radio network controller)控制面和用户面、基于智能Node B/RAN(radio access network)服务器的三种演进的UTRAN结构,分析和比较了各种UTRAN结构为系统性能、系统部署和无线接口带来的潜在优势和不利影响,旨在为UTRAN的演进提供合理的方案.     

An integrated e-supply chain model for agile and environmentallyconscious manufacturing

This paper presents a mathematically sound model for the design and optimization of supply chains in terms of such important performance indexes as product cost, cycle time, quality, energy and environmental impact in the context of global and Internet-based manufacturing. The two layer model is a hyper-network of material flows overlaid with an e-business information network. It extends from a traditional supply chain having suppliers, distributors, and users to include end-of-life product collectors and de-manufacturers. Furthermore, it extends the performance considerations from cost and productivity to include environmental performance. Such extensions allow one to develop Internet-based manufacturing systems that are agile and can produce desired products with the minimum environmental impact over their life cycles. Fuzzy logic-based optimization goals are used in the proposed multiobjective optimization model. A personal computer containing such mechatronic components as hard disk driver, keyboard, and mouse is used as an example to illustrate the application of the proposed integrated e-supply chain model     

数据中继卫星系统的数据传输协议研究

首先介绍了美国中继卫星系统的基本概况,给出了其系统组成框图和连接关系,依据中继卫星系统数据传输任务和数据传输需求,并在分析比较ESA和CCSDS的星地数据传输管理协议的基础上,提出了使用CCSDS组织的AOS建议书作为数据中继卫星系统的数据传输协议建议,给出了数据传输帧的定义和初步操作建议。