一类Rayleigh型 $p-$Laplacian平均曲率方程周期解存在唯一性

本文运用重合度理论和一些新的分析方法探讨了一类Rayleigh型p-Laplacian平均曲率方程(φp(x′(t)/(1+(x′(t))2)~(1/2)))′+f(x′(t))+g(x(t-τ(t)))=e(t)周期解存在性与唯一性问题,得到了一些相应的新结果并举例说明其结果的有效性.     

压缩的Grassmann-Rayleigh商迭代

Grassmann-Rayleigh商迭代是Rayleigh商迭代的推广形式,它能计算一个p-维不变子空间,当子空间中部分Ritz值比其它Ritz值收敛更快时,算法奇异.针对算法奇异的问题,提出了一种压缩的Grassmann-Rayleigh商迭代,新算法在保持算法立方次的收敛速度的同时克服了算法奇异的问题并节省了计算...     

关于同余式组解的一般表达式

本文去掉孙子定理中同余式组的模为互素的限制,在有解的情况下,给出同余式组 x=C_i(mod m_i),i=1,…,n 解的一般表达式,从而,推广了孙子定理。     

Cs_2NaYX_6（X＝Cl，Br）中Cr~（3＋）的d－d电子光谱和EPRg因子的研究

用双自旋－轨道耦合模型研究了Ｃｓ＿２ＮａＹＸ＿６（Ｘ＝Ｃｌ，Ｂｒ）：Ｃｒ￣３＋的ＥＰＲｇ因子。计算表明，配体Ｂｒ４ｐ轨道对络离子（ＣｒＢｒ＿６）￣３－ＰＲｇ因子的贡献不应忽略。解释了Ｃｓ＿２ＮａＹＢｒ＿６：Ｃｒ￣３＋的ｇ因子移动为正值的疑惑。     

从耦合模理论导出瑞利散射损耗

本文应用空心介质波导中模式间的耦合,并假定其中折射率分布是随机起伏的,从而推导出瑞利散射损耗,其结果与传统的以分子散射理论为基础所描述的瑞利散射损耗相一致。对从理论上并清光纤内的损耗机理具有一定的意义。     

APC/C regulation of axonal growth and synaptic functions in postmitotic neurons: the Liprin-{\varvec \alpha} connection

Protein ubiquitination has critical roles in neuronal physiology and defects in protein ubiquitination have been implicated in neurodegenerative pathology. The anaphase-promoting complex/cyclosome (APC/C) is one of two key E3 ubiquitin ligase complexes that functions in regulating cell cycle transitions in proliferating cells by acting on cyclins and components of the mitotic/meiotic apparatus. Documentation of APC/C's action beyond cell division is sparse. In the past year, however, novel and surprising roles for APC/C in postmitotic neurons, particularly in the modulation of axonal growth and synaptic functions, have been revealed. APC/C and its activator Cdh-1 are found in good abundance in neurons, and these seem to function at different cellular locations, modulating apparently diverse processes such as axonal growth and synaptic function. Interestingly, there also appears to be a single link to these apparently divergent actions of APC/C in neurons--the multi-domain, multi-functional scaffolding protein Liprin-alpha which is an APC/C substrate.     

(Ag)型R-弱交换非相容映象的公共不动点定理

首先建立了一类新的Φ-压缩映象,仅利用这个压缩条件以及度量空间中自映象对的非相容性和(Ag)型R-弱交换条件,得到了一个新的公共不动点定理.这一结果去掉了对空间完备性和映象连续性的要求,并且得到了一个不连续的公共不动点.     

Re-examining the reliability of tree-ring isotope ratio as a historical CO2 proxy

To examine the reliability of using tree ring δ¹³C and the model of isotopic fractionation in reconstructing atmospheric CO₂ levels, we studied the variations of some important parameters of several subtropical species under natural field conditions. It was found that, different from other researchers’ results, leaf conductance to CO₂ transfer, g, did not change in proportion to the change in rate of CO₂ assimilation, A, with the result that intercellular concen- tration of CO₂, C_i, could not keep constant. Thus, we conclude that the use of tree-ring isotope ratios in the reconstruction of atmospheric CO₂ variation based on the presupposition that C_i keeps constant during assimilation is not reliable under current circumstances.     

聚碳酸酯物理老化的二个热流转变

聚碳酸酯（ＰＣ）物理老化中的二个热流转变现象的研究发现：ｓｕｂ－Ｔｇ热流转变开始于较低温度,并随之移向高温,最终形成一个转变。玻璃化转变温度随此前的降温速率而变化,并存在一最低点,只有老化前的冷却速率高于该速率时,样品老化后才会出现ｓｕｂ－Ｔｇ热流转变。同时淬火的起始温度与这一热流转变也有着直接的联系。这一现象与环氧树脂相似,ｓｕｂ－Ｔｇ转变可以被归结为内应力已松弛的链段的热运动。     

优化空时格码的性能准则及串联级联卷积编码空时格码

讨论一种优化的空时格码的性能准则;再应用串联级联卷积编码加格雷映射实现一种新的空时格码.通过仿真可见,这种新空时格码比经典空时格码和编码增益优化了的空时格码在性能上都要好,具有性能好、容易构造等优点.