螺旋桩机同步跟踪自动控制系统的研制

在分析螺旋桩机施工原理的基础上，指出了加压机构与动力头旋转速度的同步是保证成桩质量的关键问题，对螺旋桩机同步跟踪自动控制系统进行了研究，阐述了系统的构成和工作原理，提出了同步跟踪的算法，并研制出单片机同步跟踪自动控制系统，该系统有效解决了螺旋桩机加压机构进尺位移与动力头电机旋转速度间的同步问题，运行稳定可靠，极大地提高了螺旋桩的承载能力，节约混凝土的用量。     

内螺纹重力热管冷凝段的特性研究

分析了在重力热管内加内螺纹的方法，研究了重力热管的冷凝段的传热及流动状况，在合理假设的基础上运用动量和能量方程对热管进行理论分析，导出了在热流密度q一定时，凝结液膜厚度δ沿壁面x变化的函数关系，并用计算机模拟求解，再应用传热方程计算出局部换热系数αx和总换热系数α。研究表明，用内螺纹热管代替咣滑内壁面热管是一种有效的强化传热的方法。     

Check of free oscillation signal with SG data

The observation of the Earth's free oscillation is an important way tostudy the Earth's inner structure and geophysical parameters. Many geophysicists have investigated the Earth's normal modes with strainmeters and spring gravimeters. Since the superconducting gravimeters appeared, people have gained a new kind of more stable instruments to detect the normal modes. The measurement for the Earth's free oscillation with the superconducting gravimeters is one of the main goals of the Global Geodynamics Project. In this note, we have investigatedthe Earth's normal modes excited by Peru Ms 7.9 Earthquake on June 23, 2001 with the superconducting gravimeter C032 at the Wuhan station. After having completed the subtraction of gravity tides with the 20th order polynomial fitting, and the correction for pressure and the analysis of the noise spectrum of the superconducting gravimeter, we accurately observed all base normal modes from 0S0 to 0S32 and the splittings of 0S2 and 0S3. Those results show a good agreement with the HB1 model.     

Carcinogenesis of asbestos switched on by inducing cross-linkage between DNA complementary pair bases

Since the beginning of the 1980s, Dai Qianhuan predicted based upon his di-region theory that the carcinogenesis switched on by the so-called physical carcinogenic factors including radiation, asbestos and foreign matter implantation, is just initiated through the cross-linking between DNA complementary pair bases induced by them. In this note, it was evidenced with the DNA filter elution method that the oxygenase activated by asbestos induces the cross-linking between DNA inter-strands and DNA-protein with dosage correlation, in which over 80% of DNA inter-strand cross-link ratio account for the total cross-link ratio. Obviously, both of the cross-linkages are just induced by hydroxyl free radical, HO ·, because the ferrous ion increased the cross-link ratios up to several times through Fenton reaction and vitamin C inhibited the cross-link ratios with factors of 8–9 by destroying the hydroxyl radical. Non-carcinogen but with lower free radical formation energy, pyrene, by culturing with asbestos gave 3–4 times cross-link ratios than the original ratios induced by asbestos only. Estradiol, an endogenous carcinogen, as a bio-electrophilic species but with higher free radical formation energy by culturing with asbestos, gave only 1.2 time cross-link ratios than expected ones. Ferrous ion which can increase HO · concentration through Fenton reaction, increased the ratios to 2–2.5 times in the former case but only 1.2 time in the latter case. Vitamin C, a free radical scavenger, gave a powerful inhibition to the cross-linking with a factor of 8–11 in the former case but a weak inhibition with a factor of 1.2 only in the latter case. So, it is evidenced further that the cross-linkages induced by asbestos are originated from hydroxyl radical. Reasonable structures of the cross-linking products induced by asbestos or hydroxyl radical have been depicted based upon AMI MO theory. These structures have been verified further by a reasonable explanation of the mutational spectrum induced by hydroxyl radical.     

一种自由边界上有源的STEFAN问题解的收敛性质

讨论自由边界条件为uε(hε(t),t)=0,-xuε(hε(t),t)=λ εh′ε(t)的Stefan问题,得到了解关于ε的一致估计,从而证明了对任何T>0,存在0<γ1<1,自由边界hε(t)在C1 γ1/2[0,T]中收敛.     

中西地名文化内涵对比及其翻译

地名蕴含丰富的自然与社会人文信息.为使译文符合“信、达、雅”标准,地名翻译应尽可能采用意译.同时还应考虑东西方文化的差异,适当对源语名称的所指述行重新命名.     

花瓣铺层碳/碳材料火箭喷管扩张段模态分析

针对花瓣铺层碳／碳材料固体火箭发动机喷管扩张段结构的特点，研究和建立了有限元计算模型，构造了模拟柔性支撑系统的弹簧约束模型．应用解答大型复杂结构的特征值问题的子空间迭代法，对喷管整体结构进行了自由振动和模态分析，导出了该喷管仿真模型的多阶自振频率和振动模态．     

自由而全面发展:合目的性与合规律性相统一的过程--马克思《1844年经济学哲学手稿》研究

马克思在《1844年经济学哲学手稿》中，从逻辑上和事实上分析了人的实践本质对象化活动必然导致人的自由而全面发展，特别指出了这种自由而全面发展的实现条件是对异化劳动的克服以及对异化劳动积极成果的保存，由此阐明了自由而全面发展是人类实践的合目的性和合规律性相统一的过程。     

基于Viterbi算法计算TCM码欧氏自由距离的有效方法

提出了计算格形编码欧氏自由距离的一种有效算法，该算法是依据Viterbi算法，取全零路径为参考路径进行计算，求得准规则码的欧氏自由距离，它适用于搜索高斯信道中的TCM好码。     

Self-aggregation of vapor-liquid phase transition

The concept of the molecular free path is introduced to derive a criterion distinguishing active molecules from inactive molecules in liquid phase. Based on molecular self-aggregation theory a concept of the critical aggregation concentration (CAC) of active molecules is proposed to describe the physical configuration before the formation of the nuclei in the process of vapor-liquid phase transition. All active molecules exist in the form of the monomer when the concentration of active molecules is lower than CAC, while the active molecules will generate aggregation once the concentration of the active molecules reaches CAC. However, these aggregates with the aggregation number N smaller than 5 can steadily exist in bulk phase. The other excess active molecules can only produce infinite aggregation and form a critical nucleus of vapor-liquid phase transition. Without outer perturbation the state point of CAC corresponds to the critical superheated or supercooled state in the process of vapor-liquid phase transition. With the aggregate property, the interfacial tension between the bulk phase and the tiny new phase is predicted and a correction is made for the classical nucleation rate in a quite good agreement with experimental results.