无粘土冲洗液的降泵压性能研究

本文讨论了田菁减阻液的试验研究结果,即雷诺数、浓度、管径、机械降解及阳离子等因素对田菁减阻性能的影响。还探讨了紊流减阻的机理及介绍了田菁减阻液在岩心钻探中的初步应用效果.     

竹红菌甲素的光谱学研究(I)激光激励的荧光过程

用Ar~+激光器的488.0,514.5nm和氦氖激光器的632.8nm激光线激励竹红菌甲素粉晶和它的乙醇、丙酮、甲苯溶液,测得它们的荧光光谱,荧光峰值波长与溶液极性有关,随着极性增强,峰值波长向短波方向移动,表明甲素分子电子能级间距离增大,相对于粉晶最大峰值位移达61.2nm。     

浅析台湾植物区系

台湾海峡原为大陆的一部分,中新世未,由于断裂而形成海峡,台湾植物区系丰富,与大陆相同的科、属、种类多;共有成分中的古老成分多;台湾与大陆西南地区植物区系关系密切;台湾植物区系中特有种突出,它是大陆岛屿山地植物区系,台湾与菲律宾植物区系关系较少;与日本植物区系有一定联系,而后者属于中国-日本植物区系。     

Attenuating effect of daidzein on polychlorinated biphenyls-induced oxidative toxicity in mouse testicular cells

The attenuating effect of daidzein （DAI） on oxidative toxicity induced by Aroclor 1254 （A1254） was investigated in mouse testicular cells. Cells were exposed to A1254 alone or with DAI. The oxidative damage was estimated by measuring malondialdehyde （MDA） formation, superoxide dismutase （SOD） activity and glutathione （GSH） content. Results show that A1254 induced a decrease of germ cell number, an elevation in thiobarbituric acid reactive substances （TBARS） but a decrease in SOD activity and GSH content. However, simultaneous supplementation with DAI decreased TBARS level and increased SOD activity and GSH content. Consequently, dietary DAI may restore the intracellular antioxidant system to attenuate the oxidative toxicity of A 1254 in testicular cells.     

A comparison study on the melt crystallization kinetics of long chain branched and linear isotactic polypropylenes

The isothermal and non-isothermal crystallization kinetics of LCBPP and linear-iPP was investigated by optical microscopy and differential scanning calorimetry （DSC）. The optical microscopy results in the isothermal crystallization process show that the crystals of LCBPP grow slower than the crystals of the linear-iPP. This originates from the low chain mobility, or in other words, the lower chain diffusion rate of LCBPP due to the existence of long side chains. The DSC results in the isothermal crystallization process show that the LCBPP exhibits, however, a higher overall crystallization rate with respect to the linear-iPP. This is related to the higher nucleation ability of LCBPP since the isothermal crystallization process of both LCBPP and linear-iPP are nucleation-dominated. Avrami analysis indicates that the nucleation nature and crystal growth manner of LCBPP and linear-iPP are about the same. The analyses of the non-isothermal crystallization processes indicate an increment in crystallization rate with increasing cooling rate. But at any cooling rate, the linear-iPP crystallizes more quickly than the LCBPP. This implies that the non-isothermal crystallization processes of LCBPP and linear-iPP are diffusion-dominated, in which the lower chain diffusion rate of LCBPP results in the slower crystallization of it.     

Abnormally large short term and impending earthquake geomagnetic anomaly implies a possibility of earthquake pre warning

The study found that strong magnetic anomalies repeatedly took place before big earthquakes. Based on geomagnetic record analysis results,we discussed a possible pattern of the magnetic anomalies prior to earthquake. In meizoseismal area or epicenter,in a time period of 36 h to about 10 min before earthquake,the exceptional big geomagnetic change increases with the magnitude of earthquake. We calculated that,in a place of 1 km from the epicenter,the magnetic anomaly before destructive earthquakes of Ms 6～9 can reach to 102～104 nT(the magnitude of earth magnetic field is 104 nT) ,rather than the magnitude of 10 nT from seismomagnetic effect theories since 1960s. From this we speculated the abnormal magnetic ULF near epicenter before earthquake seems to be an "intermittent magnetic eruption". Accordingly,we proposed that geomagnetic induction earthquake alarm can be a new pre-warning method to surmount hardship in solving the puzzledom of earthquake imminent prediction.     

低阶奇异性边界单元法

本文所提出的低阶奇异性边界单元法,是以传统的边界单元法为基础,通过引入一个新的角变量,致使力的核函数由原来l/r的阶奇异性,降低为与位移核函数一样,仅具有Inr阶奇异性(r是场点与源点之间的距离)。从而推出新的边界积分方程,该方程具有较低奇异性,特别是在应力计算时,基本消除了原边界单元法的“边界层效应”——即原边界单元法在边界层附近的应力不能计算的现象。在本文中,还将对该新方法所编制的程序用于工程构件——300T压花机肘杆的强度分析,其结果与原边界单元法及光弹性实验结果有较好的一致性。     

气垫带式输送机系列设计及其计算机辅助设计

文章对气带垫式输送机的系列设计进行了简要介绍,并对整个系列设计的计算部分进行了简化。将上千次不同参数组合计算简化为几百次,并拟出了适合各种不同设计参数,如带宽、带速、输送长度、倾角、物料等的组合下,输送机驱动功率的计算式表。从而使整个气垫带式输送机的计算快速、简便,并以实例说明了式表的选用方法及其优点。文章还对系列设计的计算机辅助设计进行了介绍。     

以西润中笔墨传情--简论严宜生的中国画艺术

严宜生先生有40余年的教学生涯,教学之余他还执着于国画的创作与研究,取得了较好的成绩,并形成了自己的绘画风格.他以自己出色的的艺术敏感和智慧,成功地在笔墨、色彩和构图等艺术形式上融合中西,继承传统又推陈出新,并用寓意、象征等手法,使作品超越其国画形式本身,趋向一种物我依存、天人合一的境界.     

社会主义混合经济运行机制研究

社会主义混合经济,是指在社会主义条件下,各种所有制的经济成份有机地结合在一起,在社会主义国家的引导或控制之下,共同进行社会生产、分配、交换和消费而形成的经济类型。通过改革,建立起控制国民经济运行的“三极管理结构”,运用管理国民经济的放大原理,充分利用社会化大生产各个环节互相依赖的关系,可在保证经济仍然按社会需要有计划按比例发展的前提下,大大降低社会经济管理总成本和国家投资量。判断一个地区的经济性质不应只看公有制经济成份在其中所占的数量比重,还应看其在经济中所处的地位。应当在改革过程中设计出各种约束机制来弥补公有制经济的损益缺乏经济约束机制的缺陷。