日本的广播电视事业

本文较详细地介绍了日本广播电视事业的管理体制，覆盖手段，东京广播电视发射塔的设置情况，以及新媒体实验情况和计划等。并结合我国国情，笔者提出了一些看法。     

利用网际组态软件WebAccess实现过程控制系统远程监控

网际组态软件WebAccess是第一个完全基于浏览器的人机界面(HMI)、监控和数据采集(SCADA)软件。本文介绍通过应用网际组态软件WebAccess，实现对过程控制实验系统的远程监控。     

用工程塑料和玄武岩打麦草粘状浆的对比研究

本试验在φ330盘磨中采用塑性材质对麦草浆进行打粘状浆的特性研究,并与用玄武岩材质磨盘打浆进行了比较。本试验采用了红外光谱、电子显微镜等先进的测试方法,通过大量的图表及数据综合分析了试验结果。结果表明:采用塑性材质磨盘打浆能使纤维本身固有强度和长度得到较好的保护,同时又能使纤维产生良好的内、外部细纤维化。在整个打浆度范围内,用塑性材质磨盘打浆的浆料比用玄武岩材质磨盘打浆的浆料有更快和更高的强度发展。在同一强度水平时,前者的WRV和°SR值要比后者低得多,而且使用塑性材质磨盘打浆可以大幅度降低能耗,提高打浆效率。塑性材质磨盘噪声很小,即使二个磨盘相互接触而被损坏时也听不到太大的噪声。和玄武岩材质磨盘相比,工程塑料材质磨盘是一种更适合于打长纤维粘状浆的设备。     

混合法双程无反射波动方程偏移

本文提出了一种虚谱法和有限元法相结合的地震偏移方法。这种混啥方法是在计算速度、精度和占用计算机内存等方面对虚谱法和有限元法进行折衷的一种选择,其目的是构造一种新的、更有效的地震偏移方法。该方法从双程无反射波动方程出发,沿反时方向进行波场计算,使混合法偏移能够适应纵横向速度变化,并能有效地减弱计算中产生的层间混响。本文采用混合法偏移理论进行了试算,其结果表明,该方法用于复杂波场的偏移计算是可行的。     

GIS的故障处理和分析

ＧＩＳ以其多方面的先进性，在高压电器领域得到日益广泛的应用。由于制造和安装中的缺陷，常在ＧＩＳ投运后发生故障，其故障处理比敞开式开关设备有新特点。通过介绍和理论的分析，出造成的主要因素，有针对性地提出在制造和安全中应注意的问题，并指出今后ＧＩＳ的安装应专业化及日常训应监测导电回路的直流电阻，并使ＧＩＳ运动的在线测装置实用化。     

Novel and efficient realizations of FIR digital filters

An FIR filter can usually be realized in the direct form or in cascade form. The Chebyshev-type structures, known for the 2-D FIR filter implementation, are generalized to the realization of arbitrary 1-D causal FIR filters. The new realizations show several attractive properties and can be implemented using modular pipelineable processor arrays     

Some Consistency Conditions for Dynamic Traffic Assignment Problems

This paper explores some critical issues in modeling network traffic flow for predictive user optimal dynamic traffic assignment. They include the role of FIFO (first-in-first-out) in link, path and network traffic dynamics, minimal set representation of link traffic evolution, and consistency conditions for link models. It is found that (1) link FIFO plays a central role in modeling link, path and network traffic flow evolution, and (2) the dimension of a minimal state set that adequately describes link traffic flow under FIFO is two. Moreover, two sufficient FIFO conditions are provided, and pitfalls in using these conditions to enforce FIFO are pointed out. Finally, ramifications of these findings to DTA modeling are also discussed.     

Calculation of emittance of a coating layer with the Kubelka-Munk theory and the Mie-scattering model

The radiative transfer equation in a coating layer with a not too high concentration of pigment particles, which is attached to a substrate, is resolved in terms of Kubelka-Munk theory and a Mie-scattering model. In the case of a coating layer constituted with aluminum spherical particles, the dependence of emittance of the coating layer on particle radius and thickness of the layer are studied. The optimum radius of a pigment particle is suggested as well.     

微生物共培养促进植物乳杆菌RX-8高效合成细菌素的调控机制

目的:植物乳杆菌RX-8是一株分离自中国传统泡菜的益生菌,该菌株具有产Ⅱb类细菌素植物乳杆菌素(Plantaricin)EF的优良特性,然而产量较低。目前采用与外源微生物共培养的方式提高细菌素产量,然而共培养体系中具体的调控机制尚不清楚。本研究通过敲除种内群体感应信号分子的关键基因plnA,构建种内群体感应缺失的共培养体系,探究微生物共培养对于细菌素高效合成的内在机制。方法:构建基因缺失突变菌株植物乳杆菌ΔRX-8,通过突变菌株和野生菌株与枯草芽孢杆菌1.8715在共培养过程中的生长差异、信号分子分泌量变化以及相关基因的表达量,探究种间群体感应系统促进细菌素高效合成的作用机制。结果:在敲除关键基因plnA后,共培养中突变菌株生长曲线上与野生菌株并无明显差异,而细菌素产量有所下降。与纯培养相比,共培养体系中群体感应信号分子AI-2的分泌量在前期显著增加,而后趋于一致,从菌株水平上看并无明显差异。纯培养体系中,突变菌株的双组分系统plnBCD基因表达量略低于野生菌株,细菌素合成基因plnEF的表达量同样有所下降,然而,并不影响种间信号分子AI-2合成的基因LuxS和pfs的相对表达量。结论:在种内信号分子缺失的共培养体系中,种间信号分子可以正常分泌,种间群体感应系统可以发挥作用,推测可能存在共用双组分系统,共同促进细菌素的高效合成。     

Light‐curable composite of siloxane/hydroxyapatite prepared by the sol–gel process for bone defect treatment

The light‐curable composite of siloxane/hydroxyapatite (HA) had been successfully achieved by photopolymerization of a kind of gel combined tetraethoxyorthosilicate (TEOS) and 3‐methacryloxypropyltrimethoxysilane (MAPS) with siloxane‐modified nano‐HA (HA‐g‐Si). HA‐g‐Si was prepared by grafting reaction of 3‐isocyanatopropyltrimethoxysilane (IPS) onto the surface of HA. Then, TEOS and MAPS were mixed as precursor, and photoinitiator 2‐hydroxy‐4′‐(2‐hydroxyethoxy)‐2‐methylpropiophenone (Irgacure 2959) and as‐prepared HA‐g‐Si were added into the precursor to form a homogenous and sticky gel. The movable gel that could be cured with UV light resulted in various sharp immovable composites of siloxane/HA in different mold. The HA, HA‐g‐Si nanoparticles, and composites were analyzed by Fourier transformed infrared spectroscopy, X‐ray photoelectron spectroscopy, X‐ray diffraction, thermogravimetric analysis, transmission electron microscopy, scanning electron microscopy, mechanical testing, and water contact angles. It could be a promising bone repairing material for orthopedic application. POLYM. COMPOS., © 2011 Society of Plastics Engineers.