随机疲劳谱编制新方法

提出一种新的疲劳载荷谱编制方法,该法遵循雨流循环计数规则。新建谱与实测谱具有完全相同的循环计数统计结果,并且尽可能地保留了原实测历程谱的本身特性,与程序谱相比更接近实际。通过四种车辆实测谱计算分析,证实该疲劳谱与实测谱损伤基本等效。     

关于稀磁合金磁学性质的自洽BL方法

将 Salzberg 等发展的低温 Bethe 格点方法进行了自洽修正后推广到了整个温区,计算了稀磁合金 A_xB_(1-x)(其中A为磁原子,自旋为S,B为非磁原子,自旋为零)的局域磁矩,居里温度和磁化率。结果表明,自洽 Bethe 格点方法改进了分子场理论近似,所得结果比较可靠,它适用于研究实际稀磁合金的磁学性质。     

热敏电阻无温漂对数线性化方法

提出了一种新的无温漂对数热敏电阻线性化补偿方法。此法可使电路本身适应热敏电阻特性参数的离散性，从而解决了特殊应用环境热敏电阻测温所存在的成本高、调试工作量大、精度低等问题。     

鞍点规划与形位误差评定理论的研究

提出了鞍点规划的概念，建立了两类有重要应用价值的鞍点规划数学 模型．它是解决形位误差评定等一类工程问题的有力工具．据此可以建立 形位误差评定统一的数学模型；通过分类编码，揭示了各种评定问题的共 性．给出了最小条件的解析表达式和几何判别准则，为评定的计算机化提 供了依据．根据上述原理开发的评定软件，目前已应用在生产实际中．     

复合掺杂对BaTiO3瓷介电常数温度特性的影响

研究了Ｄｙ－Ｎｂ、Ｃｅ－Ｎｂ氧化物复合掺杂对ＢａＴｉＯ３瓷温度特性的影响。结果表明，能使ＢａＴｉＯ３瓷的介电常数－温度关系曲线变得相当平缓。对造成此结果的原因，进行了理论分析和讨论。     

动机与激励对学生管理的作用

个体行为管理的核心问题是动机与激励。动机是推动人行为内部的根本原因,激励是激发鼓励,是调动学生的积极性,强化学生正确行为的有效手段。在对学生的管理过程中,教师应灵活地运用动机与激励同学生行为的关系,强化积极行为抑制消极行为。     

激光清洗基片表面温度的有限元分析及讨论

采用有限元方法分析了激光清洗过程中基片表面的温度分布，研究了激光清洗过程中清洗阈值和损伤阈值存在的原因，推导出使用波长为３０８ｎｍ，脉宽为２８ｎｓ的准分子激光清洗硅片表面油脂的清洗阈值和损伤阈值，并进行了实验验证，其理论清洗阈值与实验结果是符合的     

Crystal structure of spinach major light-harvesting complex at 2.72 A resolution

The major light-harvesting complex of photosystem II (LHC-II) serves as the principal solar energy collector in the photosynthesis of green plants and presumably also functions in photoprotection under high-light conditions. Here we report the first X-ray structure of LHC-II in icosahedral proteoliposome assembly at atomic detail. One asymmetric unit of a large R32 unit cell contains ten LHC-II monomers. The 14 chlorophylls (Chl) in each monomer can be unambiguously distinguished as eight Chla and six Chlb molecules. Assignment of the orientation of the transition dipole moment of each chlorophyll has been achieved. All Chlb are located around the interface between adjacent monomers, and together with Chla they are the basis for efficient light harvesting. Four carotenoid-binding sites per monomer have been observed. The xanthophyll-cycle carotenoid at the monomer-monomer interface may be involved in the non-radiative dissipation of excessive energy, one of the photoprotective strategies that have evolved in plants.     

Regulation of BMP4 on the proliferation and differentiation in SVZa neural stem cells

The neural stem cells in the anterior subventricular zone (SVZa) mainly generate the progenitors that will differentiate into neurons, and along a highly circumscribed migratory access Rostral migratory stream (RMS), they migrate to the olfactory bulbs (OB). To understand the effects of BMPs on SVZa neural stem cells, in this study BMP4 at various concentrations was used to induce SVZa neural stem cells, and the living cell labeling using BMP4 promotor conjugated with red fluorescence protein showed the expression of BMP4 dynamically. The results demonstrated that low BMP4 doses (1-5 ng/mL) promoted while high doses (10-100 ng/mL) inhibited the proliferation of SVZa neural stem cells, and BMP4 promotedneuron differentiation in the early stage (1-3 d), howeverm, it inhibited the neuron commitment after 4 d. Noggin, the antagonist of BMP4, blocked the physiological effects of BMP4. In OB, BMP4 is mainly to accelerate the progenitors to withdraw from the cell cycle and trigger the differentiation, and in RMS, it promotes the proliferation of committed progenitors and not differentiation, further in SVZa, BMP4 enhances astrocyte commitment.     

Research on effects of hydrostatic pressure on the dielectric property of Pb(Zn<Subscript>1/3</Subscript>Nb<Subscript>2/3</Subscript>)O<Subscript>3−</Subscript>BaTiO<Subscript>3−</Subscript> PbTiO<Subscript>3</Subscript> relaxor ferroelectric ceramics

The dielectric properties of Pb(Zn1_1/3Nb_2/3)O₃₋ BaTiO₃₋PbTiO₃ relaxor ferroelectric ceramics near the rhombohedral and tetragonal phase boundary were investigated under hydrostatic pressure. It was found that hydrostatic pressure made their phase transition temperature T _c and the peak temperature T _m decreased, and the frequency dispersion and relaxor behavior enhanced. In these disorder systems of composite pervoskite structures, there appeared polar clusters or nanodomains. The unique physical characteristics, which made the relaxor behavior enhanced, is that the correlation length among these nanodomains decreases greatly with the pressure increasing.