查询词典 Br

BR of branny porcelain of material teaching broil and head causes potential is in auditory nerve tumour detects medium diagnostic value. Method:?

梗概： 目的：探索瞬目反射及脑干听觉诱发电位在听神经瘤检测中的诊断价值。

The structure of BNRL and the mechanism of Natural Rubber Latex's bromination were studied by Infrared Spectroscopy and Nuclear Magnetic Resonance.

结果表明：溴原子已经接到天然橡胶分子链上，其C－Br键对应的红外光谱位置分别为1088cm-1、956cm-1、908cm-1、774cm-1；天然胶乳的溴化反应机理与BNRS的相似。

Preparation of p \|cyanobenzylbromides by the bromization of p\|methylbenzenenitrile with H 2O 2\|Br 2 was studied under irradn in the cyclohexane solvents.

研究了在过氧化氢的存在下，用液溴和过氧化氢溴化对甲苯腈制备对腈基苄溴的方法。

The curve crossing probability rises gradually with the wavelength, suggesting that the conical intersection be located close to the exit channel. Br is the primary product of the photodissociation of fluorobromobenzene and bromobenzene near 266nm and it is generated through two channels.

由于势能面交叉几率随激光波长的增加有增大的趋势，我们推测势能面的交叉区域应靠近解离通道的出口。o，m，p-C6H4FBr和C6H5Br在266nm激光作用下的光解存在两种解离通道。

The research progresses in degradation technologies of benzene or some of its derivatives in water are reviewed.The macroscopical reaction mechanism of HNO2(NO2-)and C6H5Br in aqueous solution has been studied.Different influence factors have been discussed,including different pH condition,initial concentration,irradiation time,different anions and the optimization of experimental conditions.By using liquid chromatography,the degradation rate of bromobenzene has been qualitatively analyzed.The concentration variations of Br~and NO2- have been analyzed by using ion chromatography.

本文介绍了苯及其衍生物对水环境所造成的污染和危害，研究了365nm光照下HNO2(NO2-)与C6H5Br混合溶液的宏观反应过程，初步考察了混合体系中溴苯的降解及衰减行为，较为系统地探讨了影响溴苯降解过程的各种影响因素，包括溶液的pH值、初始浓度、光照时间、不同离子的影响以及实验条件的优化，并利用液相色谱法进行定量研究溴苯的降解率，利用离子色谱法分析检测实验过程中溴离子和亚硝酸根离子的变化。

The structural and photocatalytic properties of TiO〓 as well as surface acidity were greatly improved by sulfation. SO〓〓/TiO〓 solid superacid with Hammett constant Ho less than -12.14 was prepared by treating the TiO〓 with 1.0mol. L〓 sulfuric acid solution and then calcining at 450℃ for 3h. When compared to unmodified TiO〓, the SO〓〓/TiO〓 superacid catalyst exhibited higher anatase content, smaller crystal size, higher specific surface area, centralized pore size distribution, and the blue-shifted band edge of uv-vis adsorption spectra. Furthermore, the SO〓〓/TiO〓 superacid also showed excellent reaction activity and stability for CH〓Br photocatalytic decomposition even under the moist reaction conditions. The apparent quantum efficiency of SO〓〓/TiO〓 was 10 times of that of TiO〓 catalyst for the photocatalytic degradation of bromomethane. Therefore, the SO〓〓/TiO〓 superacid catalyst is promising for practical application in environmental remediation.It was found that both L and B acid sites exist on SO〓〓/TiO〓 photocatalyst while only L acid sites on TiO〓 photocatalyst. On the basis of experimental results, the synergistic model of superacidic centers was proposed for SO〓〓/TiO〓 photocatalyst to explain the photocatalytic behavior and the mechanism of superacidifing effects, assuming that the adjacent L and B acid sites induced by SO〓〓 comprise cooperatively the superacidic center on superacid photocatalyst. The group cooperation of the superacidic center could strengthen the surface acidity, increase surface acid sites and the adsorbtion of O〓, promote separation of photogenerated electron-hole pair, enhance the interfacial transfer of charges and reversibility of water adsorption. Consequently the excellent photocatalytic activity, reaction stability and resistibility to humidity of SO〓〓/TiO〓 superacid photocatalyst may attributed to the group cooperated effect of the superacidic center on the photocatalyst.

研究结果表明：SO〓〓与TiO〓表面的结合为螯合式双配位结构；TiO〓光催化剂表面经H〓SO〓浸渍处理后，提高了表面酸性，改善了催化剂结构和光催化性能，当H〓SO〓浸渍浓度为1.0mol.L〓、烧结温度为450℃时，可制得SO〓〓/TiO〓超强酸催化剂(H〓＜-12.14)，其结构和光催化活性得到明显改善，与TiO〓相比，SO〓〓/TiO〓光催化剂的锐钛矿含量高、晶粒小、BET比表面积大、孔径分布集中、光谱吸收边蓝移，具有优异的光催化氧化活性、稳定性及抗湿性能，光催化降解溴代甲烷的表观量子效率比TiO〓催化剂提高了一个数量级，是一种有实际应用前景的高效光催化剂；由此提出了SO〓〓/TiO〓超强酸催化剂表面集团协同作用的超强酸中心模型，认为在SO〓〓/TiO〓超强酸催化剂表面，由SO〓〓诱导的相邻L酸中心和B酸中心组成了集团协同作用的超强酸中心，其集团协同作用显著地增强了催化剂表面酸性、增大了表面酸量及O〓吸附量、促进了光生电子和空穴的分离及界面电荷转移，具有可逆吸附水的性能，是SO〓〓/TiO〓超强酸催化剂具有优异的光催化氧化活性、很好的活性稳定性及抗湿性能的重要原因。

Old English brēad, of Germanic origin; related to Dutch brood and German Brot

bread是活跃于70年代的一支美国乐队，唱一些简单，。。。

The findings of this study demonstrate the presence of enzymes in S. Japonicum, which are able to catabolize the heme.

成虫匀浆抽提物体外降解血红素的反应对pH值有依赖性，HO和BR反应的最佳pH环境均为pH 8.7。

The layers can increase obviously the destiny of microstructure, magnetic properties Br, Hcb, m and compressive strength of the NPMC bonded by plastic. The epoxy coating can improve effectively the corrosion resistance of the NPMC and delay the rust of NdFeB particles, especially the pycno-film of the cathodal electrophoresis epoxy resin plays a dominant role in the achievements. The investigation of the temperature stability of the NPMC bonded by plastic, whose NdFeB magnetic particles are NFZ-1 and Nd〓Fe〓B/α-Fe,〓 made in China, shows that their ergo-temperatures vary with their components.

环氧树脂涂层能有效地改善塑料粘结NdFeB永磁复合材料的耐蚀性，延缓锈蚀的发生，特别是致密的阴极电泳环氧树脂涂层对塑料粘结NdFeB永磁复合材料具有更为优异的防腐作用；国产的NdFeB磁粉（NFZ-1和Nd〓Fe〓B/α-Fe、〓）制成的塑料粘结永磁复合材料的温度稳定性的研究表明〓纳米晶合金制成的塑料粘结永磁复合材料使用温度应不超过100℃，NFZ-1制成的塑料粘结永磁复合材料可在120℃以下工作，Nd〓Fe〓B/α-Fe制成的塑料粘结永磁复合材料可在140℃以下工作。

The electrooxidation or-reduction of BR is not only the electron transfer process of itself, but also relates to BV, bile-purpurin , choletelin and etc..

胆红素和胆绿素等胆汁色素既是人体血红素分解代谢过程中的中间产物，又参与人体的多步代谢过程。

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。