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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。

Institution: Research Center of Stomatology of NJMU,Nanjing 210029;Research Center of Stomatology of NJMU,Nanjing 210029;Dentural Research Center of NJMU,Nanjing 210029;College of Automation Engineering,Nanjing University of Aeronautics and Austronautics,Nanjing 210016,China

单 位：南京医科大学口腔研究所，江苏南京 210029；南京医科大学口腔研究所，江苏南京 210029；南京医科大学义齿研究中心，江苏南京 210029；南京航空航天大学自动化学院，江苏南京 210016

Yanxiang Hotel, which is located in Beijing Wangjing business center, is a gardenlike threestar hotel. Ittakes 20 minutes' drive to center city, and 15 minutes to Capital International Airport and InternationalExhibition Center.

燕翔饭店是处于北京繁华的望京商圈中的一家花园式三星级饭店，距市中心20分钟车程，离首都国际机场、各大国际展览中心仅15分钟车程。

I skated out to center stage, or rather center ice, 10,000 people cheering me on at The Forum in L.A. I know it sounds hammy, but I'm a performer, and all my life center stage is where I've wanted to be.

我滑到舞台的中央，或者说是冰场的中央，在洛杉矶的现场有一万人向我欢呼，我知道他们的热情有些过了，可是我是一个表演者，我的全部生命的中心舞台就是那些我想去的地方。

It was founded that the hardness distribution is approximately symmetrical to the center of welding line , the weakest zone of the whole joint is about 10mm from the center of the welding line . The HAZ of the welding line has an intenerate zone. the center of the welding line presents a typical dendritic casting structure.

结果表明：焊接接头的硬度以焊缝中心线为对称轴呈近似对称分布，焊接接头的最薄弱环节位于距焊缝中心约10mm处，焊接接头的热影响区内存在一个软化区。

A line of osteoblasts is present a the center-right forming new bone, but lacunae containing multinucleate osteoclasts are at the center left and lower center destroying bone.

一行成骨细胞正在中右部形成新骨，而腔隙内的多核破骨细胞正在中左与中底部破坏骨。

It is now a first-rate national center for ophthalmology. Some of the projects rank high internationally, for example, the success of treating 30,000 cases of myopia with LASIK. For the success of the operations, the center introduced sophisticated medical equipment, e.g. the first personalized LASIK. For optimal results, the center used the most sophisticated cornea topographic map, cornea pachymeter, automatic plate shaper and eye ground confocal laser scanning system, making the operations a more sophisticated project. Moreover, as all the doctors have rich clinical experience and expertise, and with painstaking efforts, they acquired great skills and familiarity with the medical equipment, resulting in what is "the man-machine unity".

一些项目已达到国际先进水平，如以该中心成功完成30000例准分子激光治疗近视为例，为了做好准分子激光治疗近视手术，该中心不仅引进了先进的治疗设备，如在我国率先引进了第一台个性化准分子激光治疗近视系统，而且为了严格把关，选择最佳治疗效果，又启用了最先进的角膜地形图、角膜测厚仪、微型自动角膜板层成型刀和眼底共焦激光扫描系统等，使准分子激光治疗近视手术成为更完善的系统工程，加之该中心医生大都从事眼科临床多年，有丰富经验和深厚知识底蕴，通过刻苦努力，很快做到&人机合一&，娴熟地掌握了最先进的眼科诊疗武器。

The "daVinci representation"(right panel of Figure 6) is a comprehensive visual representation of the scoliotic spine that illustrates the orientation of the planes of maximum curvature of the 3 spine segments in the transverse view. The center of the circular plot is the point where the central hip vertical axis (CHVA, CHVA is a true vertical bisecting the bi-femoral head axis, often considered to represent the physiological center of balance of the spine-pelvic unit) intersects the transverse plane and every arrow radiating from the center represents a spine segment (PT, MT, and TL/L).

圆的圆心是位于髋中心的Z轴与横断面相交点(CHVA，CHVA是双侧股骨头连线重点的垂线，通常作为脊柱-骨盆单元生理平衡的中点)及每个箭头发自表示脊柱节段的中心。

When a sinusoidally modulated light spot was presented at their receptive field center,the on-center and off-center cells responded half a cycle (=180°) out of phase with one another at all intensities tested.

当正弦调制的光点投射在它们的感受野中心时，在不同的刺激强度下，给光中心细胞和撤光中心细胞的反应相位彼此相差半个周期(180°)。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。