一类半线性椭圆方程组非平凡解的不存在性

一类半线性椭圆方程组：{△u（x）＋f1（u（x））g1（v（x））=0 x∈Ω △v（x）＋f2（u（x））g2（v（x））=0 x∈Ω u（x）＋v（x）=0 x∈aΩ其中,Ω R^N是关于0的星形区域f1、f2、g1、g2：R→R＋为非负函数．在一定条件下,它的非平凡解是不存在的．     

汤旺河干流水电站规划二氧化硫减排量的分析和计算

开发水电资源,可以替代火电,减少二氧化硫的排放量,为节能减排做出积极地贡献．根据汤旺河干流水电规划,尝试对规划实施后替代的二氧化硫减排量进行分析和计算．     

松花江水污染模型的数值研究

研究参考文献[4]中干支流水系统所建立的反应扩散方程组.使用傅里叶级数方法,在不同条件下对此方程组的解进行数值模拟.     

An atomistic simulation of site preference and vibrational properties of UMxAl12-x （M = Fe, Co, Ni, Cr and Mn） and UMxAl1z-xHx

A series of lattice inversion pair potentials are used to evaluate the phase stability and site preference for uranium intermetallics UMxAl12-x (M = Fe, Co, Ni, Cr and Mn) and their related hydrides. Calculated results show that Fe, Co, Ni, Cr or Mn atoms preferentially substitute Al at the 8f site. Interstitial H atoms only occupy 2b interstitial sites in UMxAl12-x. Calculated lattice constants are found to agree with a report in the literature. Elastic constants and bulk modulus of UMxAl12-x and UMxAl12-xH were also investigated. In particular, the phonon densities of states (DOS) of these actinide compounds were evaluated for the first time.     

Microelectronics-embedded channel bridging and signal regeneration of injured spinal cords

Due to the difficulty in spinal cord regeneration with biological methods, the microelectronic neural bridge, a new concept based on microelectronic technology, is presented. The microelectronic system has been realized in the forms of hybrid and integrated circuits. The integrated circuits for neural signal detection, stimulation, and regeneration are realized in a CMOS process. In animal experiments with 100 toads, 48 rats, and 3 rabbits, nerve signals have been successfully detected from spinal cords and sciatic nerves, and functional electrical stimulation has been carried out for spinal cords and sciatic nerves. When the microelectronic system is bridged between the controlling and stimulated nerve, the relevant motion of legs and nerve signal waveforms, which are stimulated by the evoked or spontaneous nerve signal through such a system, have been observed. Therefore, the feasibility of the presented method was demonstrated.     

Distributed modeling of the beginning and ending dates and durations of limited temperatures over the rugged terrain of Chongqing

A physically based empirical model was established for the beginning and ending dates (BED) of limited temperatures.Data used were daily mean temperatures from 34 conventional stations in the Chongqing region,measured from 1961 to 2000.Using this model in combination with the distributed modeling results of monthly mean temperatures,we developed a method for creating a distributed simulation of the BED and durations of limited temperatures in the rugged terrain of Chongqing.Spatial distribution maps were generated at a resolution of 100×100 m for the BED and durations of the limited temperatures of 0,10,15 and 20.Simulations suggest that the distributed model is able to successfully reveal the macroscopic trends and local distributions.For the modeled BED,the mean absolute bias error is 0.6-2.4 d.Cross-validation and case-year tests show mean absolute bias errors of 1.3-2.8 d and 0.7-2.5 d,respectively.Comparison shows that the simulation results are consistent with the field investigations.This implies that the simulations are as good as observations,thus providing a viable technique for simulating mountainous heat resources using conventional meteorological data.     

我国电子政务的发展与研究

目前,电子政务已成为世界许多国家和地区政府追求的目标和关注的焦点,我国的电子政务同样也得到了党和国家的高度重视,并成为国家信息化建设中极为重要的组成部分。本为首先介绍了我国电子政务的发展历程,然后经过深入研究总结出我国电子政务存在的问题,并提出相应的解决措施。     

西周明堂建筑起源考

西周明堂是见于史料记载的一座重要的、涉及周天子祭天、布政等重要礼仪活动的建筑。但是，有关它的功能和型制，既无西周时的史料记载，又无建筑实物遗存，成为一个众说纷纭的问题，从西汉至明甭及至近现代，诸多学者论道颇多。该文结合历史文献与原始社会至殷商的建筑考资料，通过对西周明堂起源的探讨，论证西周明堂是一座集天子祭天、布政于一体的大内正朝建筑。     

离心级联供料扰动过程中丰度分布的数值模拟

为了得到离心级联流体状态变化时同位素丰度分布情况,建立了丰度变化下的动态数学模型,与水力学数值模拟进行耦合,利用Q迭代算法求解了动态丰度方程。Xe分离数值模拟结果表明,该模型和算法可以有效求解离心级联动态丰度分布。在扰动幅度和持续时间都相同的情况下,丰度的变化与该组分在同位素中的位置、距离扰动级的位置、机器滞留量以及稳态下丰度的分布情况都密切相关。研究结果可供实际同位素生产中参数分析和调整时参考。     

烷氧基稀土钠簇合物SmNa8（O^t Bu）10（OH）的合成及催化性能初探

用定量加入NaOH的方法高产率地合成了烷氧基稀土钠簇合物SmNa8（O^t Bu）10（OH）,并对其进行了X射线晶体结构鉴定．此外,将其对芳醛的Tishchenko反应的催化活性进行了初探．