Abstract:7-hydroxylflavone (3a) and 7,8-dihydroxyflavone (3b) were synthesized starting from acetyl aryl phenols in a two-step reaction in the improved Baker-Venkatarama rearragement synthetic method of flavones. Then, three new flavone derivatives (4-6) with 7-su

Abstract:The impact of the dissolved oxygen in aqueous solution on the adsorption of phenol and o-cresol by activated carbon fiber(ACF) were investigated. The results showed that the adsorption of these phenolic compounds on ACF obeyed the Freundlish isotherm equ

Abstract:The solution of peroxo-polymolybdic acid was formed through the reaction of metallic molybdenum with hydrogen peroxide. The solvent water and excess hydrogen peroxide were removed in vacuum distillation process, then the acid was dissolved in absolute alc

Abstract:高合金含量的Al-Mn，Al-Cr合金(质量分数大于10％)中Mn，Cr含量高，传统铸造组织十分粗大，力学性能很差，不能应用．本文采用固液混合铸造技术制备了Al-20％Mn，Al-10％Cr合金．实验结果表明，合金的显微组织明显细化，其平均晶粒尺寸都能控制在10μm以下，且晶粒呈球形或近球形，压铸材料的力学性能为：σb=100～110MPa，σ0.2，=70～80MPa．随着粉末加入量的增加，合金晶粒逐渐细化．这两种合金可以应用为耐磨、耐蚀材料．

Abstract:After being purified with the mixture of sulfuric acid and nitric acid, the carbon nanotubes (CNTs) were modified with hexadecyl trimethyl ammonium bromide(HTAB). The CNTs were characterized with the transmission electron microscope (TEM) and infrared sp

Abstract:以天然鳞片石墨和椰壳活性炭为原料，在Hummers法基础上制备了氧化石墨和氧化活性炭，研究了液相天然鳞片石墨和椰壳活性炭氧化前后的结构与性能的变化．结果表明：液相氧化过程中存在表面氧化和层间氧化两种氧化反应机制，石墨质材料既有表面氧化也有层间氧化，而炭质材料则以表面氧化为主．表面氧化的结果使氧化石墨和氧化活性炭中均含有大量极性基团，这些基团的存在使它们表现出较强的极性和一定的化学活性．层间氧化使氧化石墨的层间距由原石墨的0．3354nm增加到0．8981nm，石墨片层之间的基团及H2O分子的存在是层间距增大的主要原因．在稀的碱性溶液中，氧化石墨层离后为针状或扁球状纳米颗粒，颗粒之间存在一定的团聚，而氧化活性炭为球状纳米颗粒，团聚后呈直链状．

Abstract:The total DNA from male sterile line(MS) "Zhongxin 1" and its fertile line (CK) in eggplant were screened for 60 random sequences. And primers which amplified polymorphic bands reproducibly between MS and CK were indentified. Then the 5 primers were use

Abstract:在实验室条件下进行了仓式好氧堆肥实验，研究了城市有机固体废物堆肥物料种类、温度、含水率、固体颗粒粒度、碳氮比等因素对堆肥过程中有机物降解的影响．实验结果表明最佳堆肥实验条件为：温度40～50℃，含水率50％，粒径30mm，C/N质量比30：1．实验结果显示为了保证仓式好氧堆肥反应的顺利进行，上述几个因素应当被严格地控制在适当范围内．另外，通过正交实验对各影响因素进行了比较，发现在研究的4个主要影响因素中含水率的影响作用最大，C／N质量比其次，温度和物料的粒径所起的影响作用最小、

Abstract:In this study, the trace organic pollutants of drinking water in Changsha city were concentrated on XAD resins, then the concentrate was analyzed with GC/MS. It indicated that there were 38 kinds of organic pollutants in water samples, mainly chlorides, p

Abstract:Because of the considerable errors caused by applying the analytic method for the parameter estimaton of water quality under ideal conditions, and with a view to solving the problem of several parameter estimations in two-dimensional water quality model,

Abstract:Based on the standard of product data representation and exchange, this paper presented a model for multi-rigid-body dynamics, which has components, pair, force, actuation, and constitutes corresponding application protocol based on AP105. Then, the mappi

Abstract:Based on the characteristics of the short-term load changes of power system, this paper put forward the method and procedures of BP Model in the practical load forecasting application. Through research on BP network structure, sample space, contractibil

Abstract:The logistics distribution VRP is a hot topic in logistics research. It is a NP problem and hard to get an optimal and satisfactory solution. On the basis of the mathematic model for Logistics Distribution VRP, this paper presented an Immune Clone Algori

Abstract:Based on the theory of optimal estimation, this paper proposed a compound fusion estimation algorithm of multi-layer sensors. The compound fusion structure, made up of real sensors and visual sensors, was used to solve the parameter estimation problems in

Abstract:Sharing mechanisms with biological vision systems,a real-time active stereovision system built from component parts was developed for mobile robot autonomous navigation. The active stereovision system allows accomplishing visual tasks independently, like

Abstract:对三角形接法的三绕组单相电容感应电动机的瞬态过程进行仿真分析．为了得到瞬态特性，建立了三角形(△)接法的三绕组单相电容感应电动机在αβ坐标系下的瞬态数学模型，编写计算机仿真程序，通过实例对三角形接法的三绕组单相电容感应电动机的瞬态过程进行仿真计算；用对称分量法分析了三绕组单相电容感应电动机最小不对称运行时需要满足的条件，并由此初步计算电容的数值，然后通过计算机仿真加以确定．对仿真结果进行分析．仿真结果表明：三角形接法三绕组单相电容运转电动机起动转矩较小，适合于对起动要求不高的风机泵类负载；对于起动要求较高或较大的恒转矩负载，可采用双值电容来实现．三角形接法三绕组单相电容电动机带负载的能力约为三相感应电动机在额定电压下对称运行时的0．7倍左右．

Abstract:进行了野外大比例(1：2)土-箱形基础-框架结构动力相互作用模型的试验研究．在假定环境激励是有限带宽白噪声的前提下，用NEXT法测试并分析了该7层框架结构模型脉动响应信号及其动力特性．借助在Matlab环境下编制的程序计算各点响应的功率谱，得到了模型前5阶自振频率．通过现场实测值与底部固结假定下结构三维有限元计算理论值的比较发现，考虑土-结构动力相互作用(SSI)时的自振频率比不考虑土-结构动力相互作用时结柏第一阶自振频率最大降低8．5％．

Abstract:The aim of the research on on-the-spot and indoor washing-out tests of ecological protection of rocky slopes was pressented. The testing scheme and method were introduced in detail. Through judgments of the grass in the testing area, the tests of the anti

Abstract:Frequency domain regression (FDR) method was developed to calculate z-transfer functions of multilayer walls. This method is based on the theoretical frequency characteristics of transient heat conduction through a multiplayer wall to estimate a simple po

Abstract:对结构静力弹塑性分析方法的物理意义进行了探讨，指出了该方法存在的一些局限，提出由结构前三阶振型的线性加权组合确定结构位移形状向量或将前三阶振型分别确定为前三个位移形状向量，并在把MDOF体系转换为等效SDOF体系和进行等效SDOF体系的动力时程分析时，将结构区分为屈服前和屈服后两种不同的状态、数值结果表明：采用改进的方法以后，目标位移计算精度明显提高，对结构的损伤评估结果与试验观测结果吻合．

Abstract:针对目前语音合成技术中提高语音合成自然度这一难点，研究了数据挖掘在语音合成中的应用．首先通过选取基频曲线中的最高音基频值(N1)和最低音基频值(N2)优化韵律参数，然后将其运用到关联规则对韵律参数进行规则提取的方法中，提出了优化韵律参数后的规则提取过程，并对原有的Apriori算法进行改进而获得更适合语音合成的HLApriori算法，通过该算法可以将原有Apriori算法得到的规则进一步细分，从而得到更多研究者感兴趣的规则．

Abstract:This paper presents a technique for auto-recognizing the welding joint positions based on Hough transforms. Because there are a large number of welding joints, the CCD vision sensor , which can provide much information about welding joint positions and ha

Abstract:In this paper we construct firstly a cascadic multigrid algorithm for semilinear parabolic problem. Some basic propositions which play key roles for proving the convergence accuracy and computation complexity of this algorithm are proved, among these prop

Abstract:研究了工业中常遇到的先将原料板切割成加工拼板后，再将拼板切割成单元板的一类矩形板材切割问题，此类问题归结为二维排布的双层优化，针对单元板在拼板上和拼板在原料板上的4种不同排布情形，建立了统一的非线性整数规划模型，根据问题的特点，给出了该模型的一个化双层优化为单层优化的求解算法，实际应用中，该算法能在数秒钟内按工艺要求给出最优切割方案，与传统方法相比，料板利用率常可提高5％～10％．

Abstract:In this paper, the theory and mathematic model of infrared temperature measurement was established according to the principle of blackbody radiation. This paper described the relationship between power, wavelength and temperature of the object, that is, t