Electron microscopic observations on the alterations of tegumental surface of Raillietina echinobothrida treated with root-peel extract of Potentilla fulgens

Potentilla fulgens, a member of the family Rosaceae, has been known since ancient times in Northeast India for its antiparasitic, antitumour and antidiabetic properties. The crude ethanolic extract of the plant was assayed against Raillietina echinobothrida, the intestinal cestode parasite of domestic fowl to authenticate the putative anthelmintic efficacy and cestocidal potential in particular of the plant. Treatment of the worm in-vitro with 25, 50 and 100 mg of crude extract per ml of phosphate buffered saline caused paralysis leading to death taking 4.02-4.20, 3.05-3.75 and 2.05-2.83 h respectively. Scanning electron microscopic observations on treated worms revealed deformation of surface architecture, particularly in scolex and surface microtriches. Severe distortion and disorganization of the tegumental and subtegumental layer along with cytoplasmic organelle was also observed under transmission electron microscope. The possible use of the plant as a potential anthelmintic against cestode parasite is discussed.     

Thin film measurement system for moving objects based on a laterally distributed linear variable filter spectrometer

Instantaneous measurement of optical or geometrical parameters of thin layers is an ambitious aim in many industrial applications. These layers have a variety of use-cases, such as optical bandpassing, dielectric permittivity, or lubrication. Mostly, these layers are in motion due to the production process. In order to observe process parameters, the motion usually has to be disrupted. Thus, the increase of production time due to control purposes is an undesirable drawback of this otherwise suitable technique. In this publication, we present a solution to this particular drawback of most production process monitoring systems exemplarily for film thickness measurement. We show the realization of a measurement principle which has, to our knowledge, never been published before in this application. Therefore, we exploit the advantages of the combination of a linear variable filter with a complementary metal oxide semiconductor sensor array. By an apt readout sequence, this measurement system is able to measure transmission spectra while the target is in motion. We show that this measurement system is able to measure film thicknesses of objects in the range of several 100 nm thickness at up to a velocity of 4 m/s. A reproducibility below 2 nm was acquired.     

Frequency multiplexed superconducting quantum interference device readout of large bolometer arrays for cosmic microwave background measurements

A technological milestone for experiments employing transition edge sensor bolometers operating at sub-Kelvin temperature is the deployment of detector arrays with 100s-1000s of bolometers. One key technology for such arrays is readout multiplexing: the ability to read out many sensors simultaneously on the same set of wires. This paper describes a frequency-domain multiplexed readout system which has been developed for and deployed on the APEX-SZ and South Pole Telescope millimeter wavelength receivers. In this system, the detector array is divided into modules of seven detectors, and each bolometer within the module is biased with a unique ～MHz sinusoidal carrier such that the individual bolometer signals are well separated in frequency space. The currents from all bolometers in a module are summed together and pre-amplified with superconducting quantum interference devices operating at 4 K. Room temperature electronics demodulate the carriers to recover the bolometer signals, which are digitized separately and stored to disk. This readout system contributes little noise relative to the detectors themselves, is remarkably insensitive to unwanted microphonic excitations, and provides a technology pathway to multiplexing larger numbers of sensors.     

变速箱密封检测技术初探

介绍了气密检测法在汽车变速箱生产过程中的应用,从检测系统的建立到参数的选择,都进行了分析,对于实际生产有一定的参考意义.     

复杂环境下大截面管廊一衬结构施工研究

对施工工况进行Midas数值模拟,采用旋挖灌注桩固结一衬门洞上部土体,使灌注桩和支护格栅共同作用形成半环形联合吊梁支护体系,同时研究出一种提升一衬钢格栅制作质量,提高功效的模具;一衬拱顶设置大管棚超前支护,压注双液浆超前预加固,全断面无收缩注浆工艺,管棚内设安装信号源的检查管检查注浆质量,对管棚钢管移动实施监控,套拱钢管连接注浆管的位置安装闸阀和压力表等措施,在高水位等复杂地层环境下完成大截面管廊一衬结构施工,保证洞室稳定。     

建设部村镇建设代表团赴日考察交流

第一部分概要建设部村镇建设访日代表团于2004年11月22日至12月3日,对日本村镇建设情况进行了为期12天的考察交流。作为自2002年签订的“中日村镇建设交流计划”的一部分,本次考察活动由日本农业土木综合研究所(JIID,Japanese Institute of Irrigation and Drainage,以下简称“     

硬镍铸铁Ⅳ材料磨辊衬板异常磨损后的检测分析

在我国建材、电力、化工等领域,广泛应用着一种高效节能环保型机器产品——立式辊磨机,其主要用于水泥原料、煤、脱硫剂原料的粉磨。该机器研磨机构主要由磨辊和磨盘组成．直接参与研磨的零件为磨辊衬板和磨盘衬板两种耐磨衬板。此两种零件所采用的材料主要为硬镍铸铁Ⅳ和高铬铸铁,其中应用最多的是硬镍铸铁Ⅳ。     

时光温软，岁月静好

生活在都市中的人们,如今无不想要寻找一种岁月静好般的生活,而此套位于厦门的案例便通过设计师的手,让岁月静好成为了现实。温软的阳光散落在房间每个角落,看书、听音乐,或是发呆,在此都成为了一种难得的享受。     

3D铺敷软件用于复杂铺层

正Nuclear Strategy公司(英国布里斯托尔)的先进铺敷软件(ADS),用于自动铺丝技术(AFP)和自动铺带技术(ATL)制造的复合材料结构件,它提供一种3D数学模型方案解决3D问题,优化复杂曲率模具表面上的铺层。据主要开发者Yoldas Askan表示,即使轻微的纤维路径偏差也会把内应力引入铺放纤维中,然后充当裂纹扩展点,像金属中的杂质一样。ADS能提供更精确的碳带行为模型,使相邻纤维的间隙和搭接最小化,可使纤维取向和最小间隙     

阶梯攀爬机器人结构及控制方案设计

针对阶梯攀爬机器人工作过程中的楼梯攀爬及避障问题,对阶梯攀爬机器人机械结构、机器人阶梯攀爬方式、差速驱动方式下机器人运动方程进行了分析,对阶梯攀爬机器人行驶过程中障碍物检测、避障控制策略进行了研究;基于模糊控制原理,建立了阶梯攀爬机器人模糊避障规则,提出了一种基于MC9S12XS128单片机以及超声波传感器的阶梯攀爬机器人障碍物检测、避障及楼梯攀爬控制系统,并利用所研制的阶梯攀爬机器人样机进行了机器人避障、楼梯攀爬测试。测试结果表明,基于变形轮与行星轮相结合的阶梯攀爬机器人机构可以实现阶梯攀爬机器人避障及攀爬楼梯的功能,控制系统可以准确、迅速判断障碍物以及楼梯所处位置,并依据所建立模糊避障规则完成避障及楼梯攀爬任务。