孔径

The hydraulic diameter of polymer molecular and the inaccessible pore volume in rocks of different permeability are measured by using the electrical resistivity method.

采用汞压仪和AMT—2400孔径分析仪，研究纳米硬质合金粉末&桥接&团粒对粉末及其压坯中孔隙体积分布曲线的影响。用沉降分离、高能剪切粉碎。

ABSTRACT Synthetic Aperture Radar imaging is an important evolvement in modern radar technology, which plays a key role in both milit...

机载合成孔径雷达成像是现代雷达技术的一项重大发展，它在军用和民用领域都发挥了重大的作用，在国内外都受到相当程度的重视。

Influence of process factors including hole diameter of filter,pressurised head and temperature, on the specific resistivity of aluminum was studied.

主要研究了过滤器孔径、工作压头及温度等工艺因素对铝电阻率的影响。

Annular-aperture averaging factor of optical scintillations in turbulent atmosphere.

湍流大气中光波闪烁的圆环孔径平均因子。

We have developed an array-based method to detect and locate sources of the hum, using a propagating wave approach, the dispersive properties of Rayleigh waves and data from two large aperture arrays of very long period seismometers, in California and in Japan.

我们发展了基于阵列的方法来对地球的&hum&进行检测和定位，使用了波传播的方法和瑞利波的频散特性并利用了在加州和日本的两个超长周期、大孔径的地震阵列记录到的数据。

Electromagnetic compatibility and Radio spectrum Matters;ElectroMagnetic Compatibility standard for Very Small Aperture Terminal, Satellite News Gathering, Satellite Interactive Terminals and Satellite User Terminals Earth Stations operated in the frequency rangesbetween 4 GHz and 30 GHz in the Fixed Satellite Service FSS

您当前所在的位置：首页→标准大全→欧洲电信标准→电磁兼容和无线频谱事务甚小孔径终端，在固定卫星业务中运行于 4 GHz和30 GHz频率范围的卫星新闻采集，卫星交互终端和卫星用户中断地面站的电磁兼容标准

With high specific surface area, ordered pore structure, facilely tailorable pore size, and fine chemical stability and thermostability, Mesoporous molecular sieve MCM-41 has wide application prospects in many fields, such as catalyst chemistry, adsorption and separation.

介孔分子筛 MCM-41 具有比表面积高、孔道结构规则及孔径易调节、化学稳定性和热稳定性好、表面易改性等优点，在催化化学和吸附分离等领域都有很大的潜在应用前景。

Obviousfeatures for semi-fluorinated surfactant syntheses of ordered mesoporous silicamaterials are as follows:(1) Tailorable pore size from 1.6 to 4.0 nm, estimatedby BJH and TEM methods;(2) pH value for synthetic system is extended toneutral condition;(3) Thicker porous walls, showing high hydrothermal andmechanical stability.

进一步的研究表明这些材料有以下特点：(1)根据N2吸附BJH计算方法和TEM的判断，孔径可以控制在 1.6 到 4.0nm之间；(2)合成体系的pH可以延伸到中性，而这在以往的报导中是很少见的；(3)较厚的孔壁，表现处很好的水热稳定性和机械稳定性，特别是JLU-14 比在相同条件下合成的SBA-15 和MCM-41 的机械稳定性要高很多；(4)非常大的表面积，例如JLU-1560的表面积高达

The following main results are obtained: The TiO_2 photocatalyst with small crystallite size, high surface area, narrow and uniform pore size distribution, and microporous frameworks could be prepared out by applying MW radiation in the preparation process. The microwave-induced fluorescence technique verified for the first time that microwave enhanced the formation rate of hydroxyl radical, leading to the increase in the photocatalytic efficiency. Compared with the conventional catalyst, TiO_2 prepared by MW dielectric heating owns a higher UV absorption ability, and its optical absorption edge and photovoltaic response are shifted toward the short wavelength region, resulting in increase of photooxidation efficiency. The photocatalytic conversion and the mineralization ratio of acetaldehyde are increased respectively by 30% and 40% over the TiO2 prepared by MW radiation when compared to the TiO2 prepared by the conventional heating. For the MW-assisted photocatalytic reaction over the MW-prepared TiO2, production of hydroxyl radicals is enhanced by 22.5%, and the photocatalytic conversion is accordingly increased by 20%. Similarlly, applying MW also increased the photocatalytic conversion and the mineralization ratio of acetaldehyde over TiO2/Al2O3 sample.

论文得到如下主要结果和结论：(1)微波介电加热TiO_2 溶胶可得到晶粒度小、光催化活性高、比表面积大和孔径分布窄而均一，且微孔发达的TiO_2光催化剂；在溶胶干燥处理过程中微波可使催化剂表面缺陷增加，进而导致光催化反应过程有更多的活性羟基自由基产生；(2)微波制备能显著增强TiO_2 样品的紫外光吸收率，并使其光吸收和光伏响应阈值发生蓝移，从而提高TiO_2的氧化还原能力；(3)与常规加热法所制TiO_2比较，微波法制备的TiO_2对乙醛的光催化降解转化率提高30%，CO_2生成率提高40%以上；(4)与未加微波辐射时相比，发现在光催化反应过程中施加微波，TiO_2 的羟基自由基生成速率提高了22.5%，相应CH_3CHO 光催化降解转化率提高了20%；对Al_2O_3/TiO_2催化剂，CH_3CHO 光催化降解转化率甚至提高了33%，同时CO_2 的生成率也都大幅度提高；(5)微波辐射可改变光催化降解乙醛的产物分布，推断施加微波时乙醛光催化降解按照羟基自由基引发的链式反应机理进行，微波&非热效应&起主要作用。

But the classical differential centrifugation technique needs special ultra-speed centrifuger and deuterium oxide, which limits the research and application of them.

本研究利用外来体的物理特性，用基于孔径分离的生物膜离心过滤法制备得到了外来体，有效的降低了外来体研究及应用的技术门槛。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。