船舶锚泊系统导链滚轮安装尺寸的设计方法

指出了船舶锚泊系统设计中导链滚轮及相关设备的安装尺寸缺乏定量分析的问题,以及对锚泊系统工作的不利影响。讨论了导链滚轮及相关设备的合理安装位置。给出了设计阶段中确定导链滚轮、制链器和锚链简单详细安装尺寸的方法。对导链滚轮的专业标准提出了修改意见。     

3，5-Br2-PADAP-BrO-3-SCN-三元离子缔合物测定微量BrO3-的研究

研究了 3,5- Br2 - PADAP在酸性介质中质子化后 ,与 Br O-3 和 SCN-形成三元离子缔合物的最佳条件 ,其表观摩尔吸光系数为 1.4 4× 10 5L· mol-1· cm-1,缔合物组成比为 :3,5- Br2 -PADAPH2 2 +∶ Br O-3 ∶ SCN-=1∶ 1∶ 1.提供了测定微量 Br O-3 的新方法 ,可应用于化学试剂中微量 Br O-3 的测定 ,结果满意 .     

基于耦合模型的交通组织方案对公交车NOx排放影响分析

为论证交通组织方案对NOx减排有明显的效果,本文根据实际公交线路,分别运用VISSIM交通仿真模型和Webster信号配时模型优化交通组织方案,再通过尾气排放模型MOVES与VISSIM进行联合仿真得出排放因子,分析不同类型的交通组织方案对公交车NOx排放特性的影响。结果表明：交通组织方案提升了公交车在高峰期的服务水平,对缓解交通拥堵有明显的效果,并且在工作日早晚高峰时对NOx的减排效果尤为显著;在交通设计方案中运用路中式专用道,因其独立性强和不易受社会车辆干扰等优点,在降低交通延误、提升运行速度以及减少NOX排放等方面对比其他方案最具优越性;信号配时优化对缓解交叉口NOx的排放起到主要作用,直接降低了怠速工况所占的比例,进而减少恶劣工况所带来的额外排放。     

Embedded integrated servo-controllers for intelligent modular actuators

This paper focuses on the development of an embedded integrated servo-controller （EISC） for servomotors. Comprising of mainly servo-controller and servo-amplifiers, this EISC is capable of controlling a wide range of servomotors to perform complieated tasks. Hence, integration of this EISC with a servomotor forms an intelligent modular actuator （IMA） that is essential to modern manufacturing industries. The development of such an EISC involves two major tasks： first, designing the hardware of a compact-sized and highly compatible EISC, and second, developing the software functions to facilitate its functionalities and capahilities. The developed EISC hence forms an integrated-servo-eontrol module, which determines the capability, functionality, flexibility and responsiveness of these IMAs.     

油茶籽热风干燥特性及其数学描述

干燥对油茶籽贮藏、加工和油茶质量极其重要且能耗最多,为了优化干燥工艺,研究了3种干燥方法对油茶籽中油脂稳定性的影响,考察了温度和堆积密度对油茶籽干燥特性的作用规律,采用3种不同模型对油茶籽干燥过程进行拟合,建立干燥数学模型。结果表明,油茶籽适宜采用热风干燥,干燥速率随着温度的升高和堆积密度的减小而增大,在40、55、70 ℃下,油茶籽干燥至相对安全储藏水分所需时间分别为20、15、13 h,堆积密度为322、354、430、442 kg/m3时,对应的干燥时间约15、20、22、25 h。常用的3种指数干燥模型的线性回归分析表明,Page 模型能较好地描述油茶籽热风干燥过程,所得理论值和试验值之间的平均相对误差为5.72％,说明该模型能较准确预测油茶籽干燥过程中的干燥速率及水分含量。     

Circular SAR processing using an improved omega-k type algorithm

An improved circular synthetic aperture radar (CSAR) imaging algorithm of omega-k (ω-k) type mainly for reconstructing an image on a cylindrical surface is proposed. In the typical CSAR ω-k algorithm, the rage trajectory is approximated by Taylor series expansion to the quadratic terms, which limits the valid synthetic aperture length and the angular reconstruction range severely. Based on the model of the CSAR echo signal, the proposed algorithm directly transforms the signal to the two-dimensional (2D) wavenumber domain, not using approximation processing to the range trajectory. Based on form of the signal spectrum in the wavenumber domain, the formula for the wavenumber domain interpolation of the ω-k algorithm is deduced, and the wavenumber spectrum of the reference point used for bulk compression is obtained from numerical method. The improved CSAR ω-k imaging algorithm increases the valid synthetic aperture length and the angular area greatly and hence improves the angular resolution of the cylindrical imaging. Additionally, the proposed algorithm can be repeated on different cylindrical surfaces to achieve three dimensional (3D) image reconstruction. The 3D spatial resolution of the CSAR system is discussed, and the simulation results validate the correctness of the analysis and the feasibility of the algorithm.     

Extracting Result Schema Based on Query Instances in the Deep Web

Deep Web sources contain a large of high-quality and query-related structured date. One of the challenges in the Deep Web is extracting result schemas of Deep Web sources. To address this challenge, this paper describes a novel approach that extracts both result data and the result schema of a Web database. The approach first models the query interface of a Deep Web source and fills in it with a specifically query instance. Then the result pages of the Deep Web sources are formatted in the tree structure to retrieve subtrees that contain elements of the query instance, Next, result schema of the Deep Web source is extracted by matching the subtree＇ nodes with the query instance, in which, a two-phase schema extraction method is adopted for obtaining more accurate result schema. Finally, experiments on real Deep Web sources show the utility of our approach, which provides a high precision and recall.     

基于ANN的大石板滑坡区地下水位非线性预测

采用BP神经网络模型建立了大石板滑坡在降雨条件下,地下水位下降雨过程之间的非线性关系,并预测了诱发滑坡的1983年6-7月典型降雨过程引起的地下水位。为大石板滑坡地下水渗流分析特征水头边界条件和反分析滑坡体土体的饱和渗透系数Ks提供了基本的水文地质资料。     

Somatic cell bovine cloning: Effect of donor cell and recipients

Nuclear transfer (NT) is an efficient technique for assessing the developmental potential of a nucleus and for analyzing the interactions between the donor nucleus and the recipient cytoplasm. In amphibians, thought nuclei of adult kerationocytes support development to the juvenile, tadpole stage, no development to the adult stage was re- ported[1], leaving open the question of whether a different- tiated adult nucleus can be fully reprogrammed. The first cloned offspring developed from differ…     

黄泛平原砂土钾素状况及钾肥效应研究

通过田间长期定位施肥、室内模拟及大量室内分析对黄泛区砂质潮土进行了研究，结果表明：砂质潮土速效钾含量中等偏低，缓效钾含量高，二者平均分别为７６．４ｍｇ．ｋｇ＾－１和６３１．７ｍｇ．ｋｇ＾－１，各形态钾含量为水溶态钾＜代换态钾＜非代换态钾＜矿物态钾，代换态钾与非代换态钾分别占全钾的０．３２％和３．５％，代换态和非代换钾与土壤物理性粘粒显著正相关，水溶性钾与之成相关，土壤粘土矿物以云母为主，土壤缓效钾