空隙中的生长——庄子与芒德勃罗的互读

庄子认为“无”是“道”之本源,“虚”是“道”之禀性,“无”与“虚”蕴藏着勃勃生机。芒德勃罗发现了空集的价值,揭示了自然界虚实相间的生长状态。庄子和芒德勃罗都“以无观有”,认为“无”是“有”潜藏的存在,“无”和“空”是生成万物的根源,在“空隙中生长”是宇宙的常态。芒德勃罗的空集是一种形而下的研究,其指向是现实存在物的实体和空隙合一,是对象性的整体观。庄子之“无”所看重的是人内心世界的空灵,是主客心物合一的非对象性的整体现。     

无粘结预应力砼新技术浅析

本文对无粘结预应力砼技术的主要内容作了介绍,同时分析了最新的科研成果,提出了有待研究的一些问题。它将对土建类工程技术人员的知识更新有所助益。     

证券投资组合理论和无差异曲线

文章通过无差异曲线解释了最优证券投资组合并探讨了对现代投资组合理论三个主要组成部分的有关内容.     

基于ATMega128无纸记录仪系统的设计与实现

在介绍了ATMega128和无纸记录仪系统的基础上，提出了无纸记录仪系统用基于ATMega128单片机来实现的方法和过程。显示方式采用的是320×240点阵无字库蓝色背光的LCD显示，显示信息量多，而且显示界面美观；存储方式在延续以往的EEPROM存储方式的同时，采用标准接口的大容量SD卡。     

GFMIMU/GPS组合导航系统信息融合技术研究

GFMIMU/GPS(Gyroscope Free Micro Inertial Measurement Unit/Global Positioning System)组合导航系统具有抗高g值冲击、低成本、长寿命、较高精度等优点,在低成本精确制导武器和微小型无人机具有广阔的应用前景。针对工程应用中信息融合的精度和实时性两方面的要求,运用基于模型误差预测的扩展卡尔曼滤波MEP-EKF(Extended Kalman Filter base on Model Error Predictive)方法,将MEMS(Micro Electromechanical Systems)加速度计的误差作为模型误差来考虑,对GFMIMU/GPS组合导航系统进行建模仿真,将其与EKF和UKF(Unscented Kalman Filter)方法进行了仿真比较,在方位误差角的估计上取得了比他们精度高的仿真结果,而且MEP-EKF所需时间是UKF的10%.     

局部Petrov-Galerkin无网格法在断裂力学中的应用

介绍了Petrov-Galerkin无网格法,叙述了在断裂力学应用中的几个问题的解决方法,最后给出了计算流程。     

The controlling factors and distribution prediction of H2S formation in marine carbonate gas reservoir, China

Generally, there are some anhydrites in carbonate reservoir, as H2S is also familiar in carbonate oil and gas reservoirs. Nowadays, natural gas with high H2S concentration is usually considered as TSR origin, so there is close relationship between H2S and anhydrite. On the contrary, some carbonate rocks with anhydrite do not contain H2S. Recently, researches show that H2S is only a necessary condition of H2S formation. The reservoir porosity, sulfate ion content within formation water, reservoir temperature, oil/gas and water interface, hydrocarbon and some elements of reservoir rock have great controlling effects on the TSR occurrence. TSR deoxidizes hydrocarbon into the acidic gas such as H2S and CO2, and the H2S formation is controlled by TSR occurrence, so the relationship among reaction room, the contact chance of sulfate ion and hydrocarbon, the reservoir temperature has great influence on the TSR reaction. H2S has relatively active chemical quality, so it is still controlled by the content of heavy metal ion. Good conditions of TSR reaction and H2S preservation are the prerequisite of H2S distribu- tion prediction. This paper builds a predictive model based on the characteristic of natural gas reservoir with high H2S-bearing. In the porosity reservoir with anhydrite, the formation water is rich in sulfate and poor in heavy metal ion. Oil and gas fill and accumulate in the gas reservoir with good preservation conditions, and they suffered high temperature later, which indicates the profitable area of natural gas with high H2S-bearing.     

维生素D

维生素D是一种脂溶性维生素，也被看作是一种作用于钙、磷代谢的激素前体，它与阳光有密切关系。维生素D在人类中的主要生理功能是维持血清钙和磷的浓度在正常范围内，维持神经肌肉功能正常和骨骼的健全，它是生命必需的营养素和钙代谢的最重要生物调节因子。     

SrFCl:Eu~(2+)晶体的电子自旋共振谱研究

用程序降温法生长了SrFCl:Eu~(2+)晶体,并测量了它的电子自旋共振谱。应用最小二乘法拟合技术对g因子及自旋哈密顿参数进行了精确拟合。报道了各向异性的g因子及有关自旋哈密顿参量。发现并归属了Eu~(2+)的高阶禁阻跃迁。     

一类泛圈图

本文证明了如果G是2连通无爪图,G不是圈,n=|v(G)|>q,G的每个导出子图A都满足φ(a_1,a_2),且G中不存在W′作为其导出子图,则G是泛圈图。