Infrared broadband emission of bismuth-doped barium-aluminum-borate glasses

We report near infrared broadband emission of bismuth-doped barium-aluminum-borate glasses. The broadband emission covers 1.3 mum window in optical telecommunication systems. And it possesses wide full width at half maximum (FWHM) of similar to 200nm and long lifetime as long as 350 mus. The luminescent properties are quite sensitive to glass compositions and excitation wavelengths. Based on energy matching conditions, we suggest that the infrared emission may be ascribed to P-3(1) --> P-3(0) transition of Bi+. The broad infrared emission characteristics of this material indicate that it might be a promising candidate for broadband optical fiber amplifiers and tunable lasers. (C) 2005 Optical Society of America.

mobile agent system model based on servlet technology

A mobile agent system model based on the servlet technology is presented, the constitution and working process of the system are analyzed. The implementation of key parts of this model and the current development situation as well as the development trend of mobile agent technology are introduced. The mobile agent system model enhances its internal structure recognition and facilitates the system expansion and reformation. The remotely mobile agent control method by means of the protocol modification is presented.

Research on micro-optical lenses fabrication technology

We present a detail investigation on the development of a series of gradient index (GRIN) optical glass microlens and polymer microlens and microlens arrays in our laboratory in recent years. The special glass material GRIN lenses have been fabricated mainly by using ion-exchange technology, which are applied to construct micro-optic devices and other applications. On one hand, we demonstrated the light propagation and imaging properties of GRIN lenses and the results analyzed. On the other hand, we have explored a drop-on-demand ink-jet printing method to produce microlens array using nano-scale polymer droplets involved with a uniform ultraviolet light and heat solidifying process. The experimental setup for manufacturing polymer microlens array and the performance of refractive microlens elements are also given in this paper. (C) 2006 Elsevier GmbH. All rights reserved.

Microarray-Based Study of Carbohydrate-Protein Binding by Gold Nanoparticle Probes

In order to develop a novel high-throughput tool for monitoring carbohydrate-protein interactions, we prepared carbohydrate or glycoprotein microarrays by immobilizing amino modified carbohydrates on aldehyde-derivatized glass slides or glycoprotein on epoxide-derivatized glass slides and carried out lectin binding experiments by using these microarrays, respectively. The interaction events are marked by attachment of gold nanoparticles followed by silver deposition for signal enhancement. The attachment of the gold nanoparticles is achieved by standard avidin-biotin chemistry.

Silver(I) ions-enhanced electrochemiluminescence of tris(2,2-bipyridyl)ruthenium(II)

In this paper. we demonstrate an clectrochemiluminescence (ECL) enhancement of tris(2,2-bipyridyl)rutheniuin(II) (Ru(bpy)(3)(2+)) by the addition of silver(l) ions. The maximum enhancement factor of about 5 was obtained on a glassy carbon electrode in the absence of co-reactant. The enhancement of ECL intensity was possibly attributed to the unique catalytic activity of Ag+ for reactions between Ru(bpy)(3)(3+) with OR The higher enhancement was observed in phosphate buffer solutions compared with that from borate buffer solutions. This resulted from the fact that formation of nanoparticles with large surface area in the phosphate buffer solution exhibited high catalytic activity. The amount of Ag+, solution pH and working electrode materials played important roles for the ECL enhancement. We also studied the effects of Ag+ on Ru(bpy)(3)(2+)/tripropylamine and Ru(bpy)(3)(2+)/C2O42- ECL systems.

A NOVEL DESIGN OF LIGHT-TRANSPARENT GOLD-MINIGRID THIN-LAYER FTIR SPECTROELECTROCHEMICAL CELL WITH VERTICAL CONFIGURATION

A Teflon bridge/edge-eliminator is designed to connect a glass container and a light-transparent gold-minigrid NaCl thin-layer cell to form a vertically configured in-situ FTIR spectroelectrochemical cell. The bridge/edge-eliminator sets an internal reference point for accurate potential control. The size of the thin-layer chamber is 5 X 5 X 0.11mm. A 1900-omega formal resistance of the thin-layer cell was measured in CH2Cl2/0.1 M TBAP solution. Well defined thin-layer cyclic voltammograms and IR spectral changes for ferrocene oxidation were obtained.

Transient expression of lacZ in particle bombarded Gracilaria changii (Gracilariales, Rhodophyta)

Using a Biolistic PDS 1000/He system, healthy thalli of Gracilaria changii were bombarded with gold particles coated with plasmid DNA containing the lacZ reporter gene. Transient expression of lacZ was observed in bombarded thalli under the rupture-disc pressures of 4482, 6206, 7584 and 8963 KPa, two days after bombardment. Although G. changii exhibits a slight blue background, positive expression and the background colour can be clearly differentiated. The results indicate that lacZ could be a useful reporter gene and that SV40 promoter could be an effective promoter for Gracilaria transformation.

Cross-Ocean distribution of Rhodobacterales bacteria as primary surface colonizers in temperate coastal marine waters

Bacterial surface colonization is a universal adaptation strategy in aquatic environments. However, neither the identities of early colonizers nor the temporal changes in surface assemblages are well understood. To determine the identities of the most common bacterial primary colonizers and to assess the succession process, if any, of the bacterial assemblages during early stages of surface colonization in coastal water of the West Pacific Ocean, nonnutritive inert materials (glass, Plexiglas, and polyvinyl chloride) were employed as test surfaces and incubated in seawater off the Qingdao coast in the spring of 2005 for 24 and 72 h. Phylogenetic analysis of the 16S rRNA gene sequences amplified from the recovered surface-colonizing microbiota indicated that diverse bacteria colonized the submerged surfaces. Multivariate statistical cluster analyses indicated that the succession of early surface-colonizing bacterial assemblages followed sequential steps on all types of test surfaces. The Rhodobacterales, especially the marine Roseobacter clade members, formed the most common and dominant primary surface-colonizing bacterial group. Our current data, along with previous studies of the Atlantic coast, indicate that the Rhodobacterales bacteria are the dominant and ubiquitous primary surface colonizers in temperate coastal waters of the world and that microbial surface colonization follows a succession sequence. A conceptual model is proposed based on these findings, which may have important implications for understanding the structure, dynamics, and function of marine biofilms and for developing strategies to harness or control surface-associated microbial communities.

基于SPC的电源故障预测系统研究

本文结合飞行器电源系统故障维护特点,利用统计过程控制理论,从数理统计的角度对电源系统测试数据进行分析,设计了电源故障预测系统。文中阐述了系统的工作原理和利用LabView软件的实现过程。实验结果表明此预测系统可以发现故障征兆及时维护,提高系统安全性。最后阐述了进一步研究可能会遇到的问题。

蠕动爬行攻泥机构转向工作特性的有限元分析

针对用于沉船打捞的水下攻泥机器人蠕动爬行攻泥机构的结构与工作机理 ,建立了适当的有限元计算模型 ,进而通过弹塑性有限元计算 ,模拟了攻泥机构处于土中不同深度的工作情况 ,建立了攻泥机构前进位移V和转向角θ之间关系的通用公式。通过它可以实现对攻泥机构前进路线的规划与自动控制

蠕动爬行攻泥机构工作特性的有限元分析

针对水下攻泥机器人蠕动爬行攻泥机构的结构与工作机理，建立了适当的有限元计算模型，进而通过弹塑性有限元计算，分析了攻泥机构直行攻泥时与土相互作用的工作特性，阐明了攻泥机构在前进过程中限位块导致的土体局部弱化区对其工作特性的影响程度．综合分析计算与模型试验结果，建议了攻泥机构宜行攻泥所必须的条件．

冲压自动生产线上下料机器人示教编程方法

针对由多台机器人及多种辅助设备组成的冲压自动生产线编程量大、运动协调关系复杂、联锁信号多的特点 ,介绍一种离线规划与在线示教相结合的冲压机器人示教编程方法 ,对冲压机器人进行运动轨迹、作业内容等方面的示教 ,降低了示教内容的复杂性 ,节省了在线示教所占用的现场调试和生产时间。

单元重构问题探讨

在 CIMS 环境下,采用虚拟单元技术可以解决使用成组单元的结构中出现的过量跨单元加工和加工负荷不平衡问题.本文对实现虚拟单元的关键技术——单元重构的可行性进行了分析,对单元重构的两个主要过程,即任务的时间分解过程和任务的空间分解过程进行了详细的讨论,并对所涉及到的时间划分、计划调度、工件、机器成组等问题给出了相应的策略和算法.从而证明了在 CIMS 环境下实现虚拟单元的可行性.

SJA1000在数据采集与控制系统中的应用

本文介绍了一种新型的现场总线控制器ＳＪＡ １０００的基本结构及其功能特点，简要叙述了ＳＪＡ１０００与ＡＴ８９Ｃ５１组成的在基于ＣＡＮ总线的分布式数据采集与控制系统中的硬件接口电路和工作原理，最后还给出了通信程序清单。

河道砂油藏产能预测系统研究

Productivity prediction is a serious factor to oil reservoir management and working out economic plans so that it is paid great attention to all the time. Gudao Oil Field, which has been yielding more than 100 million tons of crude oil accumulatively since it was put into developing in 1970's as a complete set of oil field, now entering double extra high water-bearing period after productivity construction, stable production and depletion stage. It's main layer series of development is thought to be type of channel sand reservoir in east China. Form channel sand reservoir in upper Guantao Group of Shengli Oil Field, there are several large oil fields such as Gudao, Gudong and Chengdao etc. with almost one-third reserves of whole Shengli Oil Field. It is considered the common characteristics in this area would be that the layer is less developed, the sand distribution is sporadic, the connectivity is weak, the heterogeneity is strong in plane, the oil layer is unconsolidated with big porosity, high permeability and serious sanding, and the oil is heavy. Because of the restricted factors to productivity of this kind of reservoir, it is very significant to study the productivity prediction this kind of reservoir. By selecting the upstream fluvial reservoir in Guantao Group of Neogene system as researching object, the author studied the forecasting technology with heterogeneous reservoir. Firstly, the author constructed the 3D subtle geological model quantificationally through researching exploitation geology in the way of combination of dynamic and static methods. Secondly, by the aid of dynamic material obtained while producing, the author analyzed the oil distribution law and influencing factors, then finished dynamic oil reservoir description on the basis of static oil reservoir description. Thirdly, via comparing and analyzing all the forecasting methods of productivity existed, the author developed a set of method to forecast productivity of single well and oil field which fit to channel sand reservoir. At last, under the support of ORACLE database, with the advanced computer technology, the author programmed the software called 'Channel Sand Reservoir Prediction System'. Up to now, this system has been putting into use in Gudao Oil Field and very successful.