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Let A" denote the commutant of a bounded linear operator S on H and R denote the collection of all operators in A" which are compact and upper triangular operators with diagonal sequence being zeros. In this paper, we show that if A"= CI + R, the K_0-group of A" is isomorphic to the integer group.

本文指出若H上的有界线性算子S的换位代数A′=CI+R，其中C是复数域，I是H上的单位算子，R是所有与S可交换的对角线为0的紧上三角有界线性算子的集合，则K_0A′

The impact of the thickness of volume H-PDLC grating on the wavelength selectivity of Bragg diffraction are simulated numerically, as well as the theoretic relationships among the refractive index modulation, spatial frequency and the H-PDLC diffraction efficiency.

计算机模拟了体光栅厚度对于布拉格衍射波长选择性的影响，以及折射率调制深度、空间频率和H-PDLC光栅衍射效率的关系。

It was found that there was a weak interaction between the C-H beside the carbonyl of FM and water.

研究发现羰基侧的H原子与水分子能形成C-H…O弱相互作用。

Based on the assumption that the distribution of DCT coefficients in H.264 encoder follows Cauchy distribution, a macroblock layer bit rate model was derived. Then, the distortion was predicted by a linear model using the actual distortion and the quantization parameters of the previous frame.

首先，基于H.264编码器中DCT系数服从Cauchy分布的假设推导得出H.264宏块层的码率模型；并采用线性模型利用前一帧已知的失真度和量化参数值对失真度进行预测；最后，在宏块层通过Lagrange方法最小化失真度，确定宏块的量化参数。

Results The cytotoxicity of chrysotile asbestos was in a dose and incubation time dependent manner. After 18 h incubation and at the dose of 250 μg/ml, the cell death rate and LDH content were increased significantly.

结果 纤状蛇纹石石棉对肺泡巨噬细胞的毒性存在着剂量-效应关系、时间-效应关系；125 μg/ml培养18 h后，细胞死亡率及LDH增加，500 μg/ml培养5 h后，细胞死亡率、LDH、MDA均明显增加，而SOD活力明显降低。

The protein expression of 3 integrin subunits also started to change from 24 h of rotation in clinostat. The expression of integrin α5 at 24, 48 and 72 h decreased by 13.1%, 20.3% and 11.9%, respectively.

整合素α5在模拟失重的24， 48和72 h分别下降了13.1%， 20.3%和11.9%；整合素αv的蛋白表达分别下降了7.4%， 18.2%和25.2%；整合素β1蛋白表达分别下降了18.6%， 25.9%和27.5%。

Thermal exposured at 175 ℃ for 100 h and 500 h, the yield strength decreases by 5.5% and 14%, and the elongation decreases by 4% and 9.3%, respectively. The fact that S′(Al2CuMg) precipitates get coarsen and the precipitate-free-zones get wider are responsible for the decline of the tensile properties of 2124-T851 aluminum alloy under thermal exposure condition.

于175 ℃热暴露500 h屈服强度和伸长率就分别降低14%和9%；于热暴露条件下，2124-T851合金拉伸性能衰退的主要原因是合金固溶体基体内主要强化相S′(Al2CuMg)相粗化以及晶界无沉淀析出带的宽化。

Our research is completed on the H.263 framework. In this paper, the theory of image coding and the recommendation H.263 are introduced.

本文的研究工作是在H.263标准的框架下进行的，首先介绍了图像编码的原理，然后对甚低码率图像编码技术进行了深入细致的研究。

Also in this dissertation, in order to assist the project of simulating cometary spectra of H〓O〓 as proposed by Kawakita and Watanabe Ap.

为了协助Kawakita和Watanabe[Ap.J.574（2002）L183-L185]提出的H〓O〓彗星光谱的理论模拟和进一步标识H〓O〓的实验谱线，本文首次利用偶极矩的从头计算结果计算了振动跃迁矩及谱线强度。

Structures of Na~+-AD ion-complexes with 1 or 2 H2O molecules were obtained. It was found that H2O can bond with Na~+ in the structure of Na~+-AD to form Na-O van der Waals bond. H2O molecule can also bond with N or O atoms in AD moiety to form H-bonds as N-H…Ow or O…Hw-Ow. The former process takes place more easily. The most stable structures of Na~+-AD ion-complexes with 1 and 2 H2O molecules are W-C7AB and 2W-C7AB, respectively.αB conformer of Na~+-AD can not exist in the presence of 2 H2O molecules.

研究发现水分子可以结合在Na~+-AD络合离子中的Na~+附近形成Na-OW范德华键，也可以与Na~+-AD络合离子骨架结构中电负性较强的N或O原子结合形成N-H…OW或O…HW-OW氢键，相对而言，水分子更容易结合在Na~+-AD络合离子中的Na~+位置，Na~+-AD最稳定的带1个或2个水分子的结构分别为W-C7AB和2W-C7AB，Na~+-AD络合离子的αB构象在2分子水存在的情况下完全消失。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。