试论混沌和急动度之关系

三维相空间是混沌和急动度之间的重要联系纽带.猝变动力学为人们提供了一种新的思维方式.急动度是研究混沌流的有效工具.     

等效原则下的商标翻译

本文结合商标翻译实例,从等效翻译的角度对商标翻译进行了分析,指出商标翻译中存在的问题,介绍了商标翻译的常用方法。     

谈等效思想在大学物理中的作用与理论创新

在大学物理中,等效思想是一种具有理论创新作用的思维方式。它主要是通过在等效条件下的替换或类比假设,将理论物理中的若干复杂问题变换为简单的、熟悉的物理问题。本文主要介绍并分析了等效思想在大学物理中的创造性作用,从而使我们在解决问题时有意识地使用这一思想。     

朊圆酵母尿酸酶的基本特性研究

研究了尿酸酶分离纯化条件和pH、温度、底物浓度、一些有机和无机试剂对尿酸酶酶促反应速度的影响.研究结果表明,用Triton X-100及巯基乙醇处理细胞悬液(pH 8.5),再用超声波处理破碎细胞效果最佳.硫酸铵沉淀尿酸酶的最佳浓度为75%.用Phenyl-Sepharose CL-4B疏水层析和Xanthine-agarose亲和层析两步纯化步骤可获得理想纯度的酶制剂.在一定的条件下,尿酸酶的最适pH和酸碱稳定pH范围分别为8.5和5.0~12.最适温度为37℃;热稳定性较好,在50℃处理30 min时     

Differences between dynamics factors for interannual and decadal variations of rainfall over the Yangtze River valley during flood seasons

The prediction of rainfall in the Yangtze River valley, especially, during flood seasons is the main means for scientists in China working on and the understanding of rainfall-associated processes is a crucial component of this effort. It can be derived f…     

Temporal-spatial dynamics of distribution patterns of microorganism relating to biological soil crusts in the Gurbantunggut Desert

Biological soil crusts serve as an important biological factor contributing to the sand fixation. This study was conducted to investigate the temporal-spatial variability of microorganism in crusts relating to locations, soil layers of sand dunes and seasons. At moss-dominated inter-dune areas, higher soil nutrient and water concentrations were likely to maintain the microbial activities. Bacteria showed the highest capabilities of settlement and growth in inter-dunes in both spring and autumn. Soil water content reached the highest value in soil crusts in the inter-dune areas, especially in spring. Variations of quantities of actinomyces and fungi basically showed the consistent trend in different locations of sand dunes. With the deepening of soil layers, vertical distribution of quantities of each microorganism group showed different characteristics because environmental factors fluctuated in both spring and autumn. Among different microorganism groups, bacteria were predominant, actinomyces the next and fungi the least in both spring and autumn in all soil layers （0-20 cm）. The proportion of bacteria and soil water content were higher in spring than those in autumn in all soil layers （0-20 cm）. No consistent trends were found in actinomyces and fungi. The results showed that the quantities of microorganisms were significantly positive correlated with organic matter content, soil water content, total N, total P, available P, available K, pH, electrical conductivity, total salt content,catalase, urease, phosphatase and alkaline phosphatase.     

空气动力学中的数学方法

空气动力学尚没有统一的研究方法，本书全面地介绍各种数学模型，并给出这些模型的数值求解方法及一些计算结果。全书分为11章和6个附录。第1章理想流体的方程；第2章线性空气动力学方程和它的基本解；第3章亚声速流中的无限翼面；第4章边界元法在亚声速流无限翼面中的应用；第5章亚声速流中的有限翼面理论、举力面理论；第6章举力线理论；     

CFD在汽车空气动力学研究中的应用

阐述了CFD方法在汽车空气动力学研究中的应用情况,并对CFD分析所用的数值方法、常用软件和CFD分析的过程做了介绍,论述了CFD与汽车车身造型的相互依存关系.     

金星类人生命研究

从广义相对论和黑洞理论出发,论证了太阳系除地球外的其它行星,尤其是金星上可能存在着类人智慧生命.生命认识事物的过程是一个吸收信号电磁波的过程,信号的传递需要时间.金星上可能存在早于人类6 500万年的类人生命,寻找金星人对人类具有重大意义.     

深部裂缝带——一种新的地震构造样式

黄河黑山峡大柳树坝址、雅砻江锦屏普斯罗坝址及其他一些水电工程区，在勘探过程相继发现了一种新的地质构造现象——深部裂缝带，并且多出现在我国强震活跃地区和强震发生断裂带上，沿断裂带历史上强震活动频繁；深部裂缝带向地下延伸超过300m，远远超出地表卸荷带的影响深度，故与强地震作用时岩体构造动力效应密切相关；讨论了根据弹性波作用下岩体的动力学响应，阐述了深部裂缝带发生的地震学原因。