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201.
随着 3G技术的进一步发展和成熟 ,现在电信和其他数据通信技术面临着一个进一步融合突破的时代。 3G的发展更推动了全球实现无缝漫游 ,互连互通的需求。这样就为全球的 3G设备制造商提出了更高的要求。但由于各协议实现厂家对协议的不同理解 ,通信设备的协议非一致性问题将日趋严重 ,为了检查各个不同生产厂家的实现是否与标准文本相一致 ,进而确保不同厂家的 3G协议实现之间能够互操作 ,一致性测试是非常必要的。文中根据笔者在 3GPP中T1信令组工作背景为基础 ,并以MAC部分测试结构和方式为例 ,给出了形式化的TTCN格式。全面的论述了 3GPP中的协议一致性测试过程 相似文献
202.
Cool 3D是一款特效图文制作软件,适用于动画片段、3D文字、图形等制作场合。Cool 3D中制作的特效素材应用于非线性编辑中,可以丰富素材的表现形式,提高节目编辑制作的整体质量。 相似文献
203.
低价硫化铝法从氧化铝直接炭还原制铝的动力学研究 总被引:3,自引:0,他引:3
低价硫化铝法从氧化铝直接炭还原制铝的动力学过程极为复杂,过程的前期受界面化学反应控制,过程后期受扩散过程控制,并求得不同时期的活化能,反应前期:E1=63.81 kJ/mol(6.67 Pa)、E2=50.82 kJ/mol(66.7 Pa)、E3=54.72 kJ/mol(666.7 Pa)、E4=39.61 kJ/mol(1333 Pa);反应后期:E*1=112.90 kJ/mol(6.67 Pa)、E*2=89.92 kJ/mol(66.7 Pa)、E*3=97.32 kJ/mol(666.7 Pa)、E*4=51.83 kJ/mol(1333 Pa).从动力学的角度提出了反应的较佳条件.温度、真空度的提高一方面可增大反应速率,但另一方面却加大了硫化铝的挥发,仅从增大速率而言,温度应大于1100 ℃,真空度应优于1333 Pa为宜. 相似文献
204.
205.
206.
I. Hole T. Tybell J. K. Grepstad I. Wrnhus T. Grande K. Wiik 《Solid-state electronics》2003,47(12):2279
Heteroepitaxial LaFeO3(1 1 0) thin films with a thickness of 150 nm were grown on LaAlO3(0 0 1) by reactive sputtering in an inverted cylindrical magnetron geometry. Equilibrium conductivity was measured as a function of partial pressure of oxygen at T=1000 °C, and logσ plotted vs. logP(O2) showed a minimum in conductivity for P(O2)=10−11 atm and a linear response between 10−10 and 1 atm. This linear response makes thin films of LaFeO3 a promising material for oxygen sensor applications. We have also measured the time response of the film conductivity upon an abrupt change in the partial pressure of ambient oxygen from 10−2 to 10−3 atm, which was determined at 60 s for T=700 °C and <3.5 s at T=1000 °C. 相似文献
207.
我国移动通信制造业在2G上晚了十年,未能取得相应的市场份额。但在3G领域,已经逐渐同步业界先进水平。如何改变现有市场格局,我国移动通信业面临全新的机会和重大的挑战,本就我国WCDMA系统产业化现状做了简要论述。 相似文献
208.
Comparison of six methylation methods for analysis of the fatty acid composition of albacore lipid 总被引:2,自引:0,他引:2
I. MEDINA S. AUBOURG J. M. GALLARDO R. PÉREZ-MARTÍN 《International Journal of Food Science & Technology》1992,27(5):597-601
Six methods widely used to produce methyl esters for the gas chromatographic determination of the fatty acid composition of a marine lipid were compared. Four acid-catalyzed methods (1% H2 SO4 : CH3 OH; 5% HCl: CH3 OH; 7% and 14% BF3 : CH3 OH) and two base-catalyzed methods [0.5M NaOCH3 : CH3 OH; (1:4) tetramethylguanidine: CH3 OH] were used.
The use of BF3 : CH3 OH (7% and 14%) gave a lower content of 18:1 n9 than the other methods and produced an artefact (2.7–3.2% of total fatty acid content) eluting between the 20:5 and 24:1 fatty acid methyl esters. No significant differences were obtained between the other four methods.
Accordingly the use of BF3 : CH3 OH for transmethylation of marine lipids is not recommended. Results obtained in the other four methods showed that all are comparable. 相似文献
The use of BF
Accordingly the use of BF
209.
Studies were made on the thermally stimulated discharge currents (TSDCs) in pure (undoped) and Fe-doped polystyrene films as a function of polarizing field, polarizing temperature and dopant concentration. While undoped films exhibited a single peak, doped films showed two peaks one at low temperatures and another at high temperatures. The low temperature peak, which exhibits a shift towards lower temperatures with increasing dopant concentration, is attributed to the relaxation of the main chain, while the high temperature peak, which shows a tendency to shift towards higher temperatures with dopant concentration, is due to space charge polarization. The TSDCs were higher for low dopant concentrations than their undoped counterparts, while for high concentrations of the dopant, the TSDCs decreased. Formation of charge transfer complexes at low dopant concentrations and molecular aggregates at higher dopant concentrations are suggested as the possible reasons for this behaviour. 相似文献
210.
Hong Jin Mohammad S. Uddin Yu L. Huang Wah K. Teo 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1994,59(1):67-72
High level expression of recombinant human tumour necrosis factor β (rh TNF-β) in Escherichia coli results in the formation of two portions of protein, namely soluble active protein and insoluble protein which is inactive and aggregates in the form of inclusion bodies (IBs). In this study, a procedure for purification and renaturation of rh TNF-β from inclusion bodies has been designed and verified experimentally with a product purity of more than 90% and a recovery of about 30%. The procedure includes washing of IBs with specific wash buffer (Triton X-100/EDTA/lysozyme/PMSF), their solubilization with 8 mol dm?3 alkaline urea, purification with ion-exchange columns, refolding with renaturation buffer and finally concentration and desalination with an ultrafiltration membrane. The characteristics of the renatured protein were identical with those of purified protein from the soluble fraction as demonstrated by (1) SDS-PAGE, (2) cytotoxic activity on mouse L929 cells, (3) N-terminal amino acid sequence, and (4) gel filtration chromatography. 相似文献