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Jinlai Zhang 《中国地球化学学报》1983,2(4):350-360
Samples of oil-field waters taken from more than fifty oil-fields in ten major oil-gasbearing basins of China have been studied in special reference to various bond parameters. It is found that the concentrations of Na+, Ca2+ and Mg2+ (ppm) show a logarithmic correlation with the bond parameters. This correlation is treated with the quantitative formula logMi=a+bL for Φ (logMi, L). Additionally, the relations between the variation of Φ (logMi, L) and the origin of oil-field waters and between that and the nature of crude oil are explored. For the convenience of solution of the formula, nomogaphy is recommended in this paper. 相似文献
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107 strains producing protease were screened from 260 strains of Antarctic psychrophilic bacteria, among which proteolytic activity of five strains was more than 45 U ml^-1. The 16S rRNA gcne sequences homology and phylogcnetic analysis of five Antarctic psychrophillc bacteria showed that NJ276, NJS-9, NJ16-70,NJ345 belonged tO the described genus Pseudoalteromonas and NJ341 belonged to the genus Colwellia. The growth and the protease characteristic of four Antarctic psychrophilic bacteria had been studied, and the result showed that the 6ptimal temperature for growth and protease-produeing of four strains was about 10℃. Their growth and protease-produeing were still high during incubatlng 2-5 days. The maximum proteolytic activity occurred at pH 9 for four Antarctic psychrophilic bacteria. The optimal temperature of protease action of both strains NJ276 and NJ5-9 was about 50℃, however, the optimal temperature of protease aetlon of both strains NJ341 and NJ345 was about 40 ℃, and their proteolytic activity under 0℃ exhibited nearly 30% of the maximum activity, but their thermal stabilities were weaker. These results indicated that proteases from NJ341 and NJ345 were low-temperature proteases. 相似文献
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The changes of plasmalemma permeability and some primary inorganic ions of Antarctic ice microalgae （ Chlamydomonas sp. ICE-L） in the low-temperature stress were examined. The plasmalemma of 1CE-L could maintain the stability at the freezing condition of -6 ℃. That signifies that it could maintain the proper function of plasmalemma and stability of the intracellular environment during sea ice formation. The function of inorganic ions on low-temperature adaptation of ICE-L was investigated by using the X-ray microanalysis method. Low temperature （0 - -6 ℃ ） induces Ca^2 ＋ concentration increment of cytoplasm, but after 24 h the content decrease quickly to normal value. As a matter of fact, Ca^2 ＋ plays an important role as the second messenger in the low temperature adaptation of ICE-L. In addition, low temperature also influences on the other primary inorganic ions transfer and the cell maintains activity by keeping ratio balance among different ions. Above all, it is necessary for Antarctic ice microalgae to survive and breed by maintaining the stability of K^ ＋ content and the balance of Na^ ＋/Cl^ -. 相似文献
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网络最短路径的地图代数栅格算法 总被引：4，自引：1，他引：3
在阐述网络分析和最短路径算法的现状的基础上,以地图代数为理论支撑,介绍了地图代数对于网络元素的表达,探讨另外一种途径的网络最短路径分析—基于栅格数据的最短路径分析,重点讨论了基于地图代数的网络数据模型、栅格路径距离计算方法,在此基础上论述了求取最短路径的栅格方法的具体过程。最后,通过算例证明栅格途径的网络分析有其独特的优势。 相似文献
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作为川东北地区三叠系飞仙关组天然气气藏最重要储集岩的粒屑白云岩和结晶白云岩的成因始终是沉积和石油地质学家高度关注的研究热点之一.在总结川东北地区三叠系飞仙关组不同类型白云岩形成温度的基础上,通过已有的白云化流体Ca/Mg值和温度之间关系式获得了川东北地区三叠系飞仙关组白云化流体的Ca/Mg值的主要分布范围.结果表明:不同类型白云岩对应的白云化流体具有不同的Ca/Mg值,同时证实了三叠纪海水或与之有关的海源流体、三叠纪海水与大气淡水混合流体的Ca/Mg值都符合在40～130℃区间、甚至更高温度下白云化(白云石沉淀)作用的要求,微晶白云岩和具原始结构的粒屑白云岩可能与地表—近地表的低温、小Ca/Mg值混合流体中相对快速的白云石沉淀作用有关,并形成了相对细的他形白云石;结晶白云岩(包括结构类似的过渡岩石类型、白云石胶结物)可能与埋藏的高温、大Ca/Mg值三叠纪海水或与之有关的海源流体中相对缓慢的白云石沉淀作用有关,并形成了相对粗的自形白云石.白云化流体的Ca/Mg值估算,可望为川东北地区三叠系飞仙关组优质储层白云岩的成因研究提供一些有价值的基础资料. 相似文献
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以柴油为唯一碳源和能源,从南极海水海冰微生物资源库中筛选到一株石油烃低温降解菌希瓦氏菌NJ49,并对影响其生长和降解率的环境因素(pH、温度、盐度、营养盐和表面活性剂)进行了初步研究。结果表明:希瓦氏菌NJ49可作为低温海域石油烃污染生物修复的菌源,其生长和降解的最适条件为:初始pH7.5,温度15℃,盐度6%,摇瓶装量80ml,最佳氮源硝酸铵,最佳磷源为磷酸二氢钾和磷酸氢二钾的混合物,添加表面活性剂可促进希瓦氏菌NJ49的生长和生物降解率。 相似文献
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GSH system plays a role in the control of the redox balance state,anti-oxidation and protecting life from injury of ROS(reactive oxygen species).In present paper,the possible GSH system of Chlamydomonas sp.ICE-L has been investigated by evaluating GSH and GSH-related enzymatic responses at different temperatures using spectrophotometer methods.The results showed that the GSH system is correlated positively to low temperature,and other factors but GR are correlated negatively to high temperature.So GSH and GSH-related enzymes play an important role in the adaptation of Antarctic ice microalgae to low temperature. 相似文献
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Reducing Influence of Gravity Model Error in Precise Orbit Determination of Low Earth Orbit Satellites 总被引：1，自引：0，他引：1
GUO Jinlai HU Min ZHAO Qile GUO Daoyu 《地球空间信息科学学报》2007,10(2):105-110
Based on the orbit integration and orbit fitting method, the influence of the characters of the gravity model, with different precisions, on the movement of low Earth orbit satellites was studied. The way and the effect of absorbing the influence of gravity model error on CHAMP and GRACE satellite orbits, using linear and periodical empirical acceleration models and the so-called "pseudo-stochastic pulses" model, were also analyzed. 相似文献