The controlling factors and distribution prediction of H_2S 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 distribution 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.     

蜡状芽孢杆菌对番茄青枯雷尔氏菌致病性的影响

青枯雷尔氏菌（Ralstonia solanacearum）从其致病性上可分为能使植株发病的强致病力菌株和不能使植株发病的弱致病力菌株．利用蜡状芽孢杆菌（Bacillus cereus）与致病性稳定的青枯雷尔氏菌强致病力菌株进行共培养，处理后的青枯雷尔氏菌在TTC平板上表现为弱毒株的菌落特征，出现了致弱现象．经过16S rDNA基因序列测定，证明了用蜡状芽孢杆菌处理前后的菌株为青枯雷尔氏菌，并非是其它的污染菌株，通过回接番茄盆栽苗发现致弱前的青枯雷尔氏菌能有效引起番茄发生青枯病，而致弱后的菌株丧失致病力．不能引起番茄发病，     

基于ARM7和uClinux系统的USB主机控制器的设计与实现

针对嵌入终端产品中大多不具备USB功能,提出了一种基于以ARM7处理器S3C44B0X和USB主控芯片CY7C67200为核心的可扩展设计方案,并结合uClinux操作系统给出了相应的软硬件设计方法,通过实际测试分析了该方案的性能及可行性。     

The effects of S4 segments on the voltage-dependence of inactivation for Cav3.1 calcium channels

T-type calcium channels exhibit fast voltage-dependent inactivation, for which the underlying struc- ture-function relationship still remains unclear. To investigate the roles of S4 segments in volt- age-dependent inactivation of T-type calcium channels, we created S4 replacement chimeras between Cav3.1 calcium channels (fast voltage-dependent inactivation) and Cav1.2 calcium channels (little voltage-dependent inactivation) by replacing S4s in Cav3.1 with the corresponding regions in Cav1.2. Wild type and chimeric channels were expressed in Xenopus oocytes and channel currents were re- corded with two-electrode voltage-clamp. We showed that replacing S4 region in domain I shifted voltage-dependence for inactivation of Cav3.1 to the left, and the V0.5 inact and kinact value were signifi- cantly changed. However replacing S4s in domains II―IV had no effects on the voltage-dependent in- activation properties. These results suggest that the roles of S4 segments in domains I―IV are different, and S4 in domain I is likely to be involved in voltage-dependent inactivation process. Its movement during membrane depolarization may trigger a conformational change in the inactivation gate.     

垃圾焚烧发电厂飞灰浸出毒性的研究

探讨了液固比、初始pH值及浸出时间对飞灰中重金属Pb、Cr、Cd、Ni、Cu、Mn、Hg、As的浸出影响.结果表明:各重金属的浸出量都随着液固比增加而增加,其中Ni、Cu、Mn、Cd的浸出量在液固比大于25后变化较平缓,As在液固比大于60后浸出量有所降低;重金属在浸取液的pH≤1.95时的浸出浓度远远大于其在浸取液的pH≥6.13时的浸出浓度;随着浸出时间的增加,Hg的浸出浓度先下降后上升,Cr的是先上升,30h后变化不大;Cd、Cu、Pb、Ni、Mn浸出时间在2h-6h后浸出浓度迅速减小,As则快速增加,而后都变化不大;在液固比、初始pH值及浸出时间三个影响因素中,pH值对重金属的浸出影响较大,重金属在酸性环境下较易浸出,但Pb在碱性情况下也易于浸出.     

产结晶纤维素酶的嗜热菌鉴定及其酶学性质

从云南腾冲热海温泉采集的样品中,分离出一株产结晶纤维素酶的嗜热菌TC-1.该菌株呈杆状,革兰氏阴性,生理生化特征分析和16S rDNA序列同源性比对表明它属于亚栖热菌属Meiothermus.结晶纤维素、木聚糖和葡萄糖可以诱导该菌产生结晶纤维素酶,其中结晶纤维素诱导的酶活力最高.对其产生的结晶纤维素酶进行了初步纯化与酶学性质研究,该酶的最适反应温度为70℃,最适pH为6.0,在50℃～70℃和pH5.5～6.5之间酶活力相对稳定.     

基于DDS技术的程控信号源设计

针对美国AD（模拟器件）公司生产的DDS产品-AD9851芯片的功能特点，阐述了AT89S52控制AD9851组成直接数字式频率合成信号发生器的应用设计电路，并对信号源的功能进行了C语言程序设计，完成了软件设计与实现．该程控信号源工作可靠，满足了高稳定度、高精度、高分辨率的要求，输出频率达20MHz．     

谈谈如何用VFP开发客户/服务器(C/S)结构系统

VFP因简单易学,可快速建立应用软件而深受广大程序员喜爱,但其数据库系统不安全也令广大用户非常头痛.随着SQL Server数据库系统的推广应用,其强大的安全性能普遍受到好评.而现在许多人都能够开发一些VFP单机系统,但仍不知如何使用VFP开发C/S系统,本论述较系统地介绍如何使用VFP开发C/S系统,使VFP和SQL...     

双水分流 各尽其妙——《大地》与《生死疲劳》之比较

中国作家莫言和美籍作家赛珍珠同为以描写中国题材见长的诺贝尔文学奖获得者。莫言的小说《生死疲劳》与赛珍珠的小说《大地》在题材、人物、主题、形式等方面双水分流，各尽其妙。两位作家在中国文学走向世界方面都做了可贵的探索。     

基于 AT90S8535的炉温控制器设计

介绍了以AT90S8535为控制芯片的电炉炉温控制系统的设计.该控制器由AT90S853单片机、键盘/显示、热电偶、温度变送器、可控硅触发电路等组成.控制器采用了PID控制算法.由AT90S8535单片机构成的炉温控制器具有高效、控制精度高、外围电路简单、可靠性好、成本低等优点,因此它具有很好的市场推行价值.