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。     

A Comparative Study on the Mechanical Properties of Jute and Sisal Fiber Reinforced Polymer Composites

The aim of the present study is to investigate and compare the mechanical properties of raw jute and sisal fiber reinforced epoxy composites with sodium hydroxide treated jute and sisal fiber reinforced epoxy composites. This is followed by comparisons of the sodium hydroxide treated jute and sisal fiber reinforced composites. The jute and sisal fibers were treated with 20% sodium hydroxide for 2 h and then incorporated into the epoxy matrix by a molding technique to form the composites. Similar techniques have been adopted for the fabrication of raw jute and sisal fiber reinforced epoxy composites. The raw jute and sisal fiber reinforced epoxy composites and the sodium hydroxide treated jute and sisal fiber reinforced epoxy composites were characterized by FTIR. The mechanical properties (tensile and flexural strength), water absorption and morphological changes were investigated for the composite samples. It was found that the sodium hydroxide treated jute and sisal fiber reinforced epoxy composites exhibited better mechanical properties than the raw jute and raw sisal fiber reinforced composites. When comparing the sodium hydroxide treated jute and sisal fiber reinforced epoxy composites, the sodium hydroxide treated jute fiber reinforced composites exhibited better mechanical properties than the latter.     

Crystallization kinetics by differential scanning calorimetry for PCL/starch and their reinforced sisal fiber composites

Calorimetric results obtained by differential scanning calorimetry (DSC) have been used to develop a kinetic model for the crystallization behavior of PCL/starch and their composites with sisal fibers. The model takes into account the effects of nucleation and crystal growth, and it is able to describe the isothermal and non‐isothermal conditions, especially for the low cooling rates. The effect of the sisal fiber has also been analyzed. The Avrami exponent was 2.0 for the crystallization of PCL/starch and sisal fiber reinforced composite. The activation energy of the crystallization process was 4.3 and 4.0 kJ/mol for PCL/starch and sisal composite, respectively. The induction time of the crystallization and the crystallization rate was not influenced by the presence of sisal fiber.     

聚乳酸/剑麻复合材料流变性能表征

利用转矩流变仪测量流变特性的方法,表征了不同剑麻纤维含量下,聚乳酸(PLA)/剑麻复合材料的流变性能,并测量实验后纤维的长度和宽度、PLA分子量,分析剑麻纤维含量和转速对复合材料体系中纤维长度的影响,以及PLA降解情况。结果表明,复合材料的非牛顿指数在纤维含量为10%左右出现峰值,并进一步随含量的增加而减小。复合体系中,刚性剑麻纤维受到来自于转子、聚合物和纤维之间的作用力,纤维被剪短,长径比减小;聚乳酸会受到转速和纤维含量的影响发生降解,这些因素都会影响PLA/剑麻复合材料的流变性能。     

Development and physico‐mechanical behavior of LDPE–sisal prepreg‐based composites

Low‐density polyethylene (LDPE)‐coated sisal fiber prepreg was prepared by using solution coating process. These coated fiber prepregs were consolidated to make composites having different weight fraction of sisal fibers in a hot compression‐molding machine. This experimental study reveals that higher loading of sisal fiber up to 57wt% in LDPE–sisal composites is possible by this technique. Mechanical and abrasive wear characteristics of these composites were determined. The tensile strength of composites increased with the increase in sisal fiber concentration. Coating thickness of LDPE was varied by changing the viscosity of LDPE–xylene solution that manifested to different weight fraction of fiber in sisal–LDPE composites. Mechanical, dynamic mechanical, and abrasive wear characteristics of these composites were determined. The tensile strength and modulus of sisal composites reached to 17.4 and 265 MPa, respectively, as compared to 7.1 and 33MPa of LDPE. Storage modulus of sisal composites LD57 reached to 2.7 × 10⁹ MPa at 40°C as compared to 8.1 × 10⁸ MPa of LDPE. Abrasive wear properties of LDPE and its composites were determined under multi‐pass mode; pure LDPE showed minimum specific wear rate. The specific wear rate of composites decreased with the sliding distance. Increase of coated sisal fiber content increased the specific wear rate at all the sliding distances, which has been explained on the basis of worn surface microstructures observed by using SEM. POLYM. COMPOS., 2013. © 2013 Society of Plastics Engineers     

剑麻纤维增强聚氯乙烯复合材料工艺与性能的研究

本文通过对剑麻纤维和聚氯乙烯基体改性，并变化成型参数，来研究它们对形成的复合材料力学性能和耐水性的影响，从而制订出剑麻纤维／聚氯乙烯复事材料的最佳成型工艺。     

Surface modification of sisal fibers: Effects on the mechanical and thermal properties of their epoxy composites

The aim of this paper is to evaluate the mechanical and thermal properties of sisal fiber reinforced epoxy matrix composites as a function of modification of sisal fiber by using mercerization and silane treatments. The changes introduced by the treatments on the chemical structure of sisal fibers have been analyzed by infrared spectroscopy (FTIR). Thermal behavior of both sisal fibers and composites has been studied by thermogravimetric analysis (TGA). Both treatments clearly enhanced thermal performance and also mechanical properties of fibers, being other physical properties also modified. Mercerization, above all when combined with silanization, led to significant enhancement on mechanical properties of composites as a consequence of increasing mechanical properties of fibers and improving fiber/matrix adhesion. POLYM. COMPOS., 26:121–127, 2005. © 2005 Society of Plastics Engineers     

剑麻/钢纤维增强改性酚醛树脂力学和摩擦性能

采用改性酚醛树脂为基体,剑麻/钢纤维混杂为增强纤维,通过辊炼、模压成型工艺制备了剑麻/钢纤维增强酚醛树脂复合材料.研究了剑麻纤维的加入及含量对聚砜改性酚醛树脂复合材料力学性能、摩擦磨损性能及热稳定性能的影响.结果表明:剑麻纤维质量分数为15%、钢纤维为10%时,复合材料的冲击和弯曲强度分别为3.82 kJ/m2和59.6 Mpa,达到最大;随着剑麻纤维含量的增加,复合材料的摩擦系数降低,热稳定性能下降,当剑麻纤维质量分数为10%时,复合材料的摩擦性能优异;复合材料的磨损面呈现黏着磨损和疲劳磨损特征.     

超声回弹综合法在剑麻纤维珊瑚混凝土 强度检测中的应用*

为了研究剑麻纤维增强珊瑚混凝土的抗压强度回归方程,本文利用超声回弹综合法和混凝土抗压试验,通过对掺有3 kg/m3剑麻纤维的珊瑚混凝土和未掺剑麻纤维的珊瑚混凝土试件分别进行试验,分别建立该试验中剑麻纤维珊瑚混凝土的超声声速、回弹代表值与抗压强度的之间的相关关系,给出该试验中相应的强度曲线,便于实际中为与剑麻纤维珊瑚混凝土抗压强度相关的研究提供参考。     

Some structural aspects of sisal fibers

A critical account has been presented of the recent investigation on the chemical modification of lignocellulosic sisal fibers. The molecular structure of the paracrystalline cellulose, which forms the major constituent of the fiber, was studied by x-ray diffraction technique. Scanning electron microscope examination of the multicellular structure, surface topology, and fracture morphology of the fiber was carried out. The mechanical properties of the sisal ultimate cell and the “technical” fiber have been investigated by means of a microextensometer and an Instron tensile tester, respectively.     

剑麻纤维增强混凝土力学性能研究

植物纤维作为一种可再生、价格低廉、来源广泛的资源,其在混凝土中的应用具有很好的前景.运用简单的力学实验,综合分析纤维的掺量、长径比对混凝土强度的影响,采用不同掺量的纤维,验证了剑麻纤维在增强混凝土抗压强度等基本力学性能方面的机理.结果表明:(1)剑麻纤维的加入会在一定程度上增强混凝土的抗压强度.(2)最佳掺量为2 kg/m3,与普通混凝土相比,剑麻纤维混凝土强度最大提升幅度为9％左右.