重要中心

The method is significant for a roller chain drive with fixed center distance.

因此，非线性方程法对中心距不可调整的重要链传动，或在同一中心距上有多挂链条的平行传动，具有重要的意义。

In human spermatozoa, the positive immunofluorescent staining of centrin protein was seen to be located in the basal body of flagellum and clearly in proximal and distal centrioles.

健康男性精子中Centrin免疫荧光阳性，位于鞭毛的基体部，显示近端和远端中心粒，而Cenexin只在一个中心粒上有明显阳性染色，表明该蛋白是人成熟精子中心体的一种重要结构成分。这一结果显示了人和啮齿目动物精子中心体的差异。

Under the double circumstances of the world trade center's transfer to the Northeast Asia and vitalizing the northeastern traditional industrial base, the central antherities poses the strategy that Dalian will be constructed the Northeast Asia important international shipping center . It is the need of the speeding up the strategy of country development and vitalizing the northeastern traditional industrial base and the mission facing the cooperation and compertition of the regional economy of the Northeast Asia, namely Dalian will be first joined in the economic circle of the Northeast Asia and take magistral effect .

在世界贸易中心向东北亚转移和国内振兴东北老工业基地的双重背景下，中央提出将大连建设成为东北亚重要的国际航运中心，这是加快实现国家发展战略，推动东北老工业基地振兴的需要，同时也是面向东北亚区域经济的融合与竞争，赋予大连的重要发展使命——率先融入东北亚经济圈并发挥主导作用。

Necessary and sufficient conditions for the existence and the expressions of selfconjugate solution, perselfconjugate solution, centrosymmetric solution, bisymmetric solution, skewselfconjugate solution, skewperselfconjugate solution, skewcentrosymmetric solution, and skewbisymmetric solution to 4 kinds of systems of linear matrix equations over a regular ring with an involutorial antiautomorphism are given.

利用矩阵技巧和所建立的矩阵理论，给出了正则环上五类矩阵方程组有解的若干充要条件和一般解的表达公式。这些矩阵方程组除了它们在理论上有重要的意义外，还有重要的应用价值。在具有对合反自同构的正则环上，给出了四类矩阵方程组有双对称解，中心对称解，斜中心对称解，广自共轭解，斜广自共轭解，自共轭解以及斜自共轭解的充要条件及其这些解的具体表达式。

The port of the whole transport chain, the largest number of goods the assembly point of convergence with inland transport, sea transport, a large number of goods; the port is an important information center, bringing together a large number of sources of supply of information, technical information, service information; port at the same time important in international trade and cargo flows distribution service centers, distribution centers.

港口是整个运输链中最大量货物的集结点，汇聚着内陆运输、水路运输等大量的货物；港口是一个重要的信息中心，汇集了大量的货源信息、技术信息、服务信息；港口同时又是国际贸易的重要的服务基地和货流分拨配送中心。

The Lake Dongting area is an important center of ramie production, and Hunan is also an important center of tea cultivation.

在洞庭湖区是一个重要的中心苎麻生产，湖南也是一个重要的中心茶叶种植。

Xingyi City is located at the junction of Guizhou, Yunnan and Guangxi provinces and autonomous region, connecting Yunnan in the west, Guangxi in the south, over 300km away from Guiyang and Kunming and 500km away from Nanning. It is one key city of the Nanning, Guiyang and Kunming Economic Area, the commodity distributing center and the traffic hub. After several years of construction, the modern three-dimensional traffic net with aviation, railway, road and water carriage has been formed in Xingyi City. The convenient traffic makes Xingyi become the key traffic hub southwestward to the sea.

兴义市地处黔、滇、桂三省结合部，西通云南，南接广西，距贵阳、昆明300多公里，距南宁500公里，是南贵昆经济区重要的区域性中心城市、物资集散地和交通枢纽中心，兴义市经过多年的建设，现已初步形成了航空、铁路、公路、水运"四位一体"的现代立体交通网络，便利的交通条件使兴义一跃成为西南出海大通道的重要交通枢纽和前沿地区，交通优势突显。

On December 22, 2000, the title of Shanghai Overseas Investment Development Board was added to the existing FID, and in October, 2001, in cooperation with United Nations Industrial Development Organization, Shanghai Investment Promotion Center was set up.

中心作为上海市吸引外商投资的重要窗口，是一家权威的官方投资促进机构。2000年12月22日，市政府把推动国内企业走出国门并为之提供优质服务的任务也赋予中心，中心增挂了"上海市对外投资促进中心"的牌子。

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。

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。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。