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排序方式: 共有274条查询结果,搜索用时 140 毫秒
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采用旋转异构体模型,将受约束聚甲醛(POM)长链等效为约束在圆柱体内,用完全计算法研究受约的聚甲醛链的热力学性质,发现体系的配分函数Z与链长N存在关系:lnZ=aN b,其中N也代表键的数目,a和b仅与温度T和无限长圆柱体的直径D有关.这种方法为研究多链体系的热力学提供一种近似方法。 相似文献
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王向红 《温州大学学报(自然科学版)》1994,(3)
本文通过矩阵和坐标变换给出了求刚体对任一点的惯量主轴及主转动惯量的一般方法,从理论上证明刚体对任一点的惯量主轴的存在性,并讨论了刚体的对称性与惯量主轴的关系。 相似文献
4.
Development ofPostgraduate Education There were only postgraduates were honored master degree from the year to in old China. While after the establishment of new China the postgraduate educationhas developed in a certain degree there were postgraduates were enrolled from to there were no postgraduates during the period of to due to the"culture revolution".…… 《广西师范大学学报(自然科学版)》2003,21(Z1):231-232
1 Development of Postgraduate Education
There were only 200 postgraduates were honored master degree from the year 1935 to 1949 in old China. While, after the establishment of new China, the postgraduate education has developed in a certain degree, there were 23,000 postgraduates were enrolled from 1950 to 1965, and there were no postgraduates during the period of 1966 to 1977 due to the "culture revolution". 相似文献
5.
In modernindustry thin film on the substratc has much important role to decide the properties ofproduct especially for electrical optical wear-resistant etc production. There aresome technical methods to prepare thin film including plasma spray physical vapordeposition 《广西师范大学学报(自然科学版)》2003,21(Z4):284-285
In modern industry,thin film on the substratc has much important role to decide the properties of product, especially for electrical, optical and wear-resistant etc, production. There are some technical methods to prepare thin film,including plasma spray,physical vapor deposition (PVD),chemical vapor deposition (CVD) and sol-gel,etc. Among of them,sol-gel method has been developed a popular tech nique for preparing thin films. 相似文献
6.
利用无规飞行高斯模型,研究四个分离的紧密接触对的分子链构象,推导了四紧密接触对的12种不同拓扑构象的几率分布理论表达式,计算了相应的几率分布的相关函数。这为理论上研究生物高分子结构特征和动力特征提供一种非常有效的方法。 相似文献
7.
Five advanced high-strength transformation-induced plasticity(TRIP) steels with different chemical compositions were studied to correlate the retained austenite and nonmetallic inclusion content with their physical properties and the characteristics of the resistance spot welding nuggets. Electrical and thermal properties and equilibrium phases of TRIP steels were predicted using the JMatPro? software. Retained austenite and nonmetallic inclusions were quantified by X-ray diffraction and saturation magnetization techniques. The nonmetallic inclusions were characterized by scanning electron microscopy. The results show that the contents of Si, C, Al, and Mn in TRIP steels increase both the retained austenite and the nonmetallic inclusion contents. We found that nonmetallic inclusions affect the thermal and electrical properties of the TRIP steels and that the differences between these properties tend to result in different cooling rates during the welding process. The results are discussed in terms of the electrical and thermal properties determined from the chemical composition and their impact on the resistance spot welding nuggets. 相似文献
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Cdk1 is sufficient to drive the mammalian cell cycle 总被引:1,自引:0,他引:1
Santamaría D Barrière C Cerqueira A Hunt S Tardy C Newton K Cáceres JF Dubus P Malumbres M Barbacid M 《Nature》2007,448(7155):811-815
10.
Aeschlimann M Bauer M Bayer D Brixner T García de Abajo FJ Pfeiffer W Rohmer M Spindler C Steeb F 《Nature》2007,446(7133):301-304
Adaptive shaping of the phase and amplitude of femtosecond laser pulses has been developed into an efficient tool for the directed manipulation of interference phenomena, thus providing coherent control over various quantum-mechanical systems. Temporal resolution in the femtosecond or even attosecond range has been demonstrated, but spatial resolution is limited by diffraction to approximately half the wavelength of the light field (that is, several hundred nanometres). Theory has indicated that the spatial limitation to coherent control can be overcome with the illumination of nanostructures: the spatial near-field distribution was shown to depend on the linear chirp of an irradiating laser pulse. An extension of this idea to adaptive control, combining multiparameter pulse shaping with a learning algorithm, demonstrated the generation of user-specified optical near-field distributions in an optimal and flexible fashion. Shaping of the polarization of the laser pulse provides a particularly efficient and versatile nano-optical manipulation method. Here we demonstrate the feasibility of this concept experimentally, by tailoring the optical near field in the vicinity of silver nanostructures through adaptive polarization shaping of femtosecond laser pulses and then probing the lateral field distribution by two-photon photoemission electron microscopy. In this combination of adaptive control and nano-optics, we achieve subwavelength dynamic localization of electromagnetic intensity on the nanometre scale and thus overcome the spatial restrictions of conventional optics. This experimental realization of theoretical suggestions opens a number of perspectives in coherent control, nano-optics, nonlinear spectroscopy, and other research fields in which optical investigations are carried out with spatial or temporal resolution. 相似文献