权威人士热评"加息"

自去年下半年以来。关于中国加息的传闻时起时落．每一次都牵动着海内外市场的神经。然而。今年2004年10月29日中国人民银行宣布利塞调整的消息传来，仍然令市场为之震动。加息之后，各方人士观点见诸媒体报端。现本刊整理部分权威人士的观点看法．以飨读者。     

炭黑与导电性材料

本发明与炭黑及其填充的导电性材料有关。该导电性材料的体积电阻率受温度的影响较小。导电橡胶、导电塑料等导电性材料具有多种用途。近年来，由于电子整机的精密化，对这类导电性材料的需要正在迅速增加。其用途之一有电子复印机、激光打印机和传真机等办公设备。这些办公设备的成像方式主流是电子照像。     

烧品——最拉风的摄影及周边器材点评和打分!——背带能当摄影包 Miggo跨界产品多用途相机背带

这款产品看上去和它的logo——背带上的红色标示一样拉风．Miggo多用途背带不仅外观赚足了回头率。实用指数也非常高!产品末端可以安装相机．可直接通过相机底部的螺口连接．非常结实。拉开中间的拉链。这就是一条宽大舒适的相机背带．使用者可以将相机挂在脖子或者肩膀上。都非常舒服。拉起中间的拉链。将产品卷起来。然后再将顶端的“绳套”套在镜头上。Miggo就变成了一款相机软包（右上图）,用来保护相机。     

国外混凝土用玻璃钢筋开发概况

混凝土是应用最广的建筑材料。混凝土通常采用钢筋来增加强度。在压力荷载下,钢筋混凝土性能卓越,但在拉伸荷载下它有变脆的趋势。混凝土养护时的拉伸应力易导致裂纹。裂纹会让水分进入,最终引起钢筋腐蚀。     

三月三 有祭奠

春节最早的雏形,来源于周人祭祀祖先和神灵的"腊祭"。因此,千百年来,祭祀成为过年最重要的习俗。通过祭祀以祈求来年风调雨顺,平安吉样。祭祖杭州建德大慈岩镇新叶村农历三月三经过《爸爸去哪儿》的"金手指",新叶村明显比从前热闹了许多。只是眼下初春,江南阴冷,游客并不多。天还未亮,我们便起床,赶着去南塘。因为塘边的有序堂是宗祠,也是全村的中心,盛大的三月三祭祖活动便是从这里开始。2015年是十年一遇的"大年",由崇义派执掌。祭祖活动比往年隆重许多。     

芦永方陶瓷艺术作品

芦永方中国高级工艺美术师,陶瓷工艺美术师。中国工艺美术学会会员,景德镇陶瓷美术家协会会员。自由陶艺家。1970年生于景德镇。自幼酷爱绘画。1990年毕业于景德镇市陶瓷职工大学。2000年创办"听松阁"陶艺工作室。精通釉上粉彩、青花、雕刻等多种综合装饰。其作品以抓实的传统功底与现代陶瓷艺术工艺相结合。创造出自然古朴、意味深远的意境,一直深受国内外知名人士的青睐,并具有较高的收藏价值。     

分析国内航空金属材料成分分析技术现状及发展

对技术以及科学领域的研究需要材料作为支撑,所以材料是经济以及技术发展的支柱。航空是国家的重要事业,材料是确保航空的安全以及发展、进步的关键。因此航空中所用的材料必须要先进。航空的制备以及材料中的技术关系着航空的命脉。所以关于材料的技术也是航空所有技术中的关键。航空中的技术有很多,但是材料是基础,没有先进的金属材料就不能研发出其他航空技术。所以从所用材料中可看出航空的科技实力以及水平。本文针对航空在国内中用的金属成分进行分析,并对材料中的技术的现状以及未来状况加以分析。     

芦永方作品

芦永方中国工艺美术师,陶瓷工艺美术师。自由陶艺家。1970年生于景德镇。自幼酷爱绘画。1990年毕业于景德镇陶瓷职工大学。2000年创办"听松阁"陶艺工作室。精通釉上粉彩、青花、雕刻等多种综合装饰。其作品以抓实的传统功底与现代陶瓷艺术工艺相结合,创造出自然古朴、意味深远的意境,一直深受国内外知名人士的青睐,并具有较高的收藏价值。电话:13407984832     

塑料产品的增亮方法介绍

1．树脂的选择：不同的树脂品种其相应制品的光泽性大不相同。对于PP来说，无规共聚的光泽度最好。对于PE来说，LDPE最好。对于PVC来说，悬浮法最好。对于PS来说，HIPS最好。     

记录城市里的“小生命”

北京大学,百年燕园。在许多人眼里。这里是一所教育人才的学堂,但是在他看来,这里又是许多小动物生存繁衍的地方。他的名字叫王放,是北京大学生态系的博士生。北大“绿色生命协会”的前会长,还是“野性中国”工作室的摄影师。     

Pitzer三参数通用关系式的改进

针对Pitzer三参数通用关系式的局限性,本文提出了一个新的较简便的方程式。对19种物质140个状态点的检验表明,该方程式不仅应用范围较宽,而且精确度也比Pitzer三参数通用关系式,Die(?)erici方程,R-K方程和Berthelot方程高。     

新的分子热力学模型及其应用(Ⅱ)——在金属溶剂萃取体系中的应用

将文(Ⅰ)提出的径向分布函数表达式与Flory-Huggins公式相结合,建立了新的非电解质溶液分子热力学模型.将其应用于复杂的金属溶剂萃取有机相体系,仅用3组二元体系实验数据,即可预测DEHPA萃取Cu、萃取Co及萃取Cu、Co各萃取有机相体系中各组分的活度系数和萃取反应热力学平衡常数,预测计算中,没有引入可调参数,而预测结果与实验结果相当吻合.     

醋酸丁酯在活性炭纤维床层中的穿透曲线

研究了醋酸丁酯在活性炭纤维床层中的吸附过程 ,获得吸附速率方程和 Freundlich吸附等温方程的吸附级数、吸附平衡常数。将吸附速率方程、吸附等温方程与物料衡算相结合预测了其他条件下的穿透曲线。预测曲线与实验结果符合得较好。     

缔合体系汽-液相平衡的研究(Ⅱ)——三元缔合体系汽-液相平衡的研究

本文提出了多元缔合体系汽-液相平衡的热力学模型,并用其计算了缔合体系水-甲酸-乙酸、水-乙酸-丙酸、水-甲酸-丙酸及甲酸-乙酸-丙酸在760mmHg下的实验液相活度系数。活度系数的计算值由Wilson方程或McCann方程给出。由相应二元体系的汽-液相平衡数据对三元体系的沸点及汽相组成进行了预测。结果表明,预测值能较好地同实验数据相吻合。     

测纯物质常沸点汽化热的一种改进方法

应用八十年代提出的新R-K状态方程式,改进纯物质常沸点汽化热的剩余函数预测法,推导出纯物质常沸点汽化热的新计算方程式。并应用该方程式,由最基本的物性数据T_b,T_c和P_c,预测了400种各类物质的常沸点汽化热,与实验值比较,预测准确度优于其它方程。     

基于微扰理论的表面活性剂水溶液表面状态方程

应用微扰理论并借鉴二维气体理论的处理方法,建立了非离子表面活性剂水溶液的表面状态方程。将微扰理论与压力方程相结合,建立了离子表面活性剂水溶液的表面状态方程。运用提出的状态方程,分别对6种烷基聚氧乙烯醚、辛基酚聚氧乙烯醚、十二烷基硫酸钠等表面活性剂水溶液的表面压数据进行了关联,并利用关联所得的参数预测了其他种类的烷基聚氧乙烯醚及辛基酚聚氧乙烯醚和十二烷基硫酸钠水溶液在不同温度下的表面压。关联和预测的精度均较高,结果令人满意。     

Predicting the surface tension of biodiesel fuels from their fatty acid composition

The emergence of biodiesel fuels as diesel fuel substitutes has led to several studies on their properties. Surface tension, which plays a role in atomization, has lacked attention compared to other properties. This paper presents a method to predict the surface tension of biodiesel fuels based on the fatty acid composition. Several binary, ternary, and quaternary mixtures of fatty acid ethyl ester gas chromatographic (GC) standards were prepared, and we found that a mass-average equation predicted the surface tension of these mixtures within ±3.5% of their measured values. Six complex mixtures of fatty acid methyl ester GC standards that simulated typical oils used as biodiesel fuels were also prepared. For these complex mixtures the predicted surface tensions of the mixtures, calculated from a mass-average equation, were 2–6% higher than the measured values. A mass-average equation was developed in which we used a weighted surface tension for the individual components, and we found that this method predicted the surface tension of the simulated oils within ±4.5% of their measured values. Five natural vegetable oils were used to produce biodiesel fuels by the transesterification process. The predicted surface tensions of these fuels were all within ±3.5% of their measured values. The surface tensions of 15 biodiesel types were then predicted, based on their fatty acid composition as published in the literature. These results show that the differences in surface tension between biodiesel types are not the main cause of the reported differences in engine tests.     

Statistical mechanics and artificial intelligence to model the thermodynamic properties of pure and mixture of ionic liquids

In this paper, the volumetric properties of pure and mixture of ionic liquids are predicted using the developed statistical mechanical equation of state in different temperatures, pressures and mole fractions. The temperature dependent parameters of the equation of state have been calculated using corresponding state correlation based on only the density at 298.15 K as scaling constants. The obtained mean of deviations of modified equation of state for density of al pure ionic liquids for 1662 data points was 0.25%. In addition, the performance of the arti-ficial neural network (ANN) with principle component analysis (PCA) based on back propagation training with 28 neurons in hidden layer for predicting of behavior of binary mixtures of ionic liquids was investigated. The AADs of a col ection of 568 data points for al binary systems using the EOS and the ANN at various temperatures and mole fractions are 1.03%and 0.68%, respectively. Moreover, the excess molar volume of all binary mixtures is predicted using obtained densities of EOS and ANN, and the results show that these properties have good agree-ment with literature.     

空化流中空穴的溃灭强度和诱导的自由基浓度

Enhancing the chemical reaction processes by means of the energy released in the collapse of micro bubbles or cavities in the cavitation flow is a new research area. In the previous work, a new approach of measuring concentration of free hydroxyl radicals induced in cavitation flow by using methylene blue as the indicator was developed and used to study concentration of free radical induced in Venturi cavitation flow under various experimental conditions. In the present research, the radial evolution of a cavity bubble and the corresponding collapse pressure in sonic cavitation field are obtained by solving three different bubble dynamics equations： Rayleigh equation, Rayleigh-Plesset equation and Gilmore equation. By comparing with the experimental data on the radial evolution of a cavity bubble in the literature, it is found that the predicted results by the Gilmore equation, which takes account of the compressibility of fluid in addition to the viscosity and interfacial tension, agree with the experimental ones better than those by other two equations. Moreover, the theoretically predicted collapse pressures are consistent with the concentration of the free hydroxyl radical induced in the experimental venture. Thus, the concentration of the liberated free hydroxyl radical not only influences the reaction rate but also is used as an available parameter for measuring collapse intensity of cavities.     

多元渗透维里方程通式的表达：双水相系统的液液平衡计算

提出了基于三元系修正Ｐｉｔｚｅｒ模型的多元渗透维里方程通式，并应用于双水相系统液液平衡性质的关联和预测，用汽液平衡数据关联模型参数，预测了聚乙二醇／硫酸镁双水相系统的液液平衡；用汽液平衡数据和尽可能少的液液平衡数据关联模型参数。同时预测了焦点或不含电解质的ＰＥＧ／葡萄糖双水相系统的液液平衡和ＫＣｌ电解质在ＰＥＧ／ＤＥＸ系统中的分配系数。计算结果表明，模型有较好的预测功能。