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.     

磷酸钙催化剂上二异丁基乙缩醛裂解法合成乙烯基异丁醚的研究

研究了在磷酸钙催化剂上二异丁基乙缩醛裂解制乙烯基异丁醚反应的活性和选择性，其中较好的催化剂是在500度焙烧的Ca3(PO4)2(1)。考察了工艺条件对反应结果的影响，表明在反应温度约300度，缩醛的LHSV＝1．0h^-1时得到最佳反应结果：转化率约98．6％，选择性接近100％，用TPD法测定了催化剂表面的酸度和碱度，并与活性和选择性进行了关联。     

比塔派克斯的根尖诱导效果

目的　探讨比塔派克斯在根尖诱导术中的诱导效果 .方法　选择根尖尚未形成的年轻恒牙牙髓炎或根尖周炎共 112个患牙 (患者 97例 ) .随机分为两组 ,实验组 6 4个牙用比塔派克斯糊剂诱导根尖成形 ,对照组 4 8个牙用氢氧化钙糊剂诱导根尖成形 .结果　实验组根尖诱导效果优于对照组 ,两组间有显著性差异 (P <0 .0 5 ) .结论　比塔派克斯糊剂比氢氧化钙糊剂具有更好的根尖诱导作用     

纳米CaCO3/丙烯酸树脂浆液的流变性

制备了纳米CaCO3/丙烯酸树脂浆液,当浆液(48 gZ-26、50g纳米CaCO3和83.3 g二甲苯)中分散剂添加量为3 g时,Casson屈服应力τc值最小,浆液的稳定性最好,与工艺条件优化时所得到的一致.纳米CaCO3/丙烯酸树脂浆液的流变性研究表明:该体系的流动特性符合Casson模型,其屈服应力τC较小,稳定性较好;浆液的黏度随剪切速率增加而显著下降,具有明显的剪切稀化特性,且随着纳米CaCO3含量增加,其剪切稀化趋势增强;在所考察的低剪切速率范围内,纳米CaCO3浆液具有明显的触变性,且纳米CaCO3含量越大触变性越大.图10,表7,参8.     

我国海水制盐业废渣处理利用现状

介绍了盐石膏的理化性质,综述了我国海盐工业废渣盐石膏在水泥、石膏建材等建筑领域以及对盐石膏的深加工等方面的综合利用研究现状,并指出利用盐石膏制备硫酸钙晶须具有广阔的发展前景。     

应用全谱直读光谱仪测定原油中铁和钙元素的含量

提出了利用电感耦合等离子发射光谱ICP -AES法测定原油中铁、钙元素含量的方法 ,考察了雾化压力、RF功率等对被测元素分析线强度的影响 ,确定了仪器的最佳使用条件。试验表明 ,该方法简便、快速、精密度和准确度均令人满意 ,能满足实际应用的要求     

中碳钙硫易切削钢夹杂物形态控制

在实验室进行了1 kg坩埚实验,研究了中碳高硫结构钢钙处理前后夹杂物的形态、尺寸及组?结果表明:钢钙处理后获得了可以改善钢切削性的纺锤形夹杂物,夹杂物的平均纺锤形率为68.11%,并且随钢中[Ca]/[S]增加夹杂物纺锤形化趋势增加;钙处理后小于2.5 μm的夹杂物占夹杂物总量的76.05%,夹杂物细小、弥散分布于钢基体中;夹杂物类型以钙铝酸盐芯硫化物外壳的复合夹杂物、(Mn,Ca)S形式的硫化物为主,有少量的铝酸钙与CaS的复合夹杂物;含钙硫的45钢铸态钢锭比普通45钢铸态钢锭切削性能有所改善.     

锌粉置换提金中铜影响的研究

在氰化冶金贵液中，Cu含量高达838．0mg/L，严重影响锌粉置换提金。通过多项研究试验，发现常温下搅拌24h，保持贵液中CaO浓度为400mg/L，可使Au的置换率达到99．83％，Cu只有1．5％。     

Calcium release from frog sarcoplasmic reticulum by an imidazolyl reagent

Summary Calcium is released from the isolated heavy sarcoplasmic reticulum (SR) of frog skeletal muscle upon application of 0.1–1 mM diethylpyrocarbonate (DEP, an imidazolyl reagent). The Ca-ATPase activity of SR was suppressed by 20% in the presence of 1 mM DEP. More than 1 mM of free magnesium ion or 5 M ruthenium red eliminated the effect of DEP on calcium release but not on Ca-ATPase activity. A plausible site of DEP action is on the calcium channel.     

Effect of feeding cereal-legume diets to rats on in vitro absorption of45Ca

Summary The in vitro absorption of calcium from the duodenum was significantly less in a group of rats fed on a wheat diet than in a group fed a wheat and Bengal gram (7030) diet.