TB-偶氮胂双波长分光光度法同时测定锶、钡

研究了TB -偶氮胂与锶、钡的显色反应 ,实验结果表明 ,该络合反应在pH 0 .2～ 2 .5酸度范围内具有较好的灵敏度 (εSr =4 .5× 1 0 4L·mol- 1 ·cm- 1 和εBa =4 .3× 1 0 4L·mol- 1 ·cm- 1 ) ,反应酸度范围宽 (pH 0 .2～2 .5 )且两者最大吸收波长具有明显差异 ,可用双波长分光光度法同时测定Sr2 +、Ba2 +.该方法用于某些纯试剂中Sr、Ba的同时测定 ,结果满意     

乙醚与丙酮燃烧反应机理

利用公式△H=-0．1196n／A计算了乙醚和丙酮分别在氧气和空气中燃烧反应的温度,并推测了乙醚和丙酮燃烧反应的机理．乙醚在氧气中燃烧反应的火焰温度理论值为3272K,与测定温度3134K接近,误差为4．40％．丙酮在空气中燃烧反应的火焰温度理论值为1292K,与测定温度173K接近,误差为1．49％．根据乙醚和丙酮燃烧反应的火焰温度,推测乙醚和丙酮燃烧反应机理为：（1）O2＋hv→2O·;（2）（C2H5）2O→4C＋4H2＋H2O（乙醚）,CH3COCH3→3C＋2H2＋H2O（丙酮）;（3）H2＋O·→H2O＋hv;（4）C＋O·→CO＋hv;（5）2CO＋O2→2CO2．     

1-(4-硝基苯基)-3-(5-氯吡啶)三氮烯的合成及其与铜的显色反应

报道了 1 - (4-硝基苯基 ) - 3 - (5 -氯吡啶 )三氮烯 (NPCPDT)的合成及其与铜的显色反应 .在OP存在下 ,在pH为 1 1 .0的硼砂 -氢氧化钠缓冲溶液中 ,该试剂能与铜发生显色反应 ,铜与NPCPDT形成摩尔比为 1∶3型的黄色配合物 ,在 4 5 0nm处有一最大正吸收 ,在 5 3 5nm处有一最大负吸收 .以 4 5 0nm为参比波长 ,5 3 5nm为测量波长进行双波长测定 ,表观摩尔吸光系数为 2 .4 2× 1 0 5L·mol-1 ·cm-1 ,铜的浓度在0～ 0 .6 μg/mL范围内符合比尔定律 .用拟定方法测定人发中的微量铜 ,结果满意     

羟胺二磺酸盐磺化水解生成铵盐的反应过程 I.羟胺二磺酸钾的磺化反应

针对湿法同时脱硫脱硝工艺 ,提出通过构造一个液相反应过程 ,将 NOx 和 SO2 溶解在溶液中生成的 NO2 -2 和 SO2 -3 经过一系列连续的液相离子反应生成有利用价值的 NH+4 ,实现资源的合理利用。在 35°C～ 74°C,离子强度为 0 .5 5 mol/L时对羟胺二磺酸钾磺化反应动力学进行了研究 ,得出反应的动力学方程为 :- dcHIDSdt =kc HON( SO3) 2 -2 · c HSO-3,其中 k=5 .5 0 9× 1 0 8· e-6.154× 10 4 / RT;在5 0°C、离子强度为 0 .31 mol/L～ 0 .65 mol/L时 ,研究了该反应的盐效应 ,结果表明该反应呈负盐效应 ,离子强度为零时 ,有最大的速率常数 k0 =0 .0 2 4 7L /( mol· min)     

超声波下酸化碘酸钾和亚硫酸钠反应的反应速率研究

分别测定在有超声波作用和在无超声波作用条件下 ,酸化碘酸钾 (KIO3 )和亚硫酸钠 (Na2 SO3 )反应的反应速率方程式及活化能 ,从而研究该反应的机理以及超声波在该反应中的作用 ,并确定反应的最佳条件。实验得出 ,超声波对该反应有一定的促进作用 ,但是这种促进作用只提高反应的速率常数和降低反应的活化能 ,并没有改变反应机理。在超声波功率为 30 0W时 ,反应的速率方程表示式为 :v =k·c1 0 9(KIO3 ) ·c1 0 0 (Na2 SO3 )·c1 0 8(H+ ) ,其中 :k =95 0 (mol-1·L) 2 ·s-1,活化能为 17 35kJ·mol-1。实验还得出 ,在温度为2 98K时 ,当KIO3 与Na2 SO3 的初始浓度比为 2∶5 ,H+ 的初始浓度为 0 0 4 2 8mol·L-1,超声功率为 30 0W时 ,反应速率为最快 ,即v =4 31× 10 -4mol·L-1·s-1)。     

柠檬酸三丁酯的新合成法

SO2 -4 /Zr O2 、Fe Cl3· 6H2 O、NH4 Fe(SO4 ) 2 · 1 2 H2 O三种催化剂对柠檬酸与正丁醇酯化反应的催化性能 ,结果表明 ,Fe Cl3· 6H2 O催化活性最高。通过系统地研究Fe Cl3· 6H2 O催化合成柠檬酸三丁酯的工艺条件 ,确定其适合的工艺流程为 :酸醇比 1∶1 2 .5,催化剂用量为 3% ,反应温度为 1 2 5℃ ,反应时间为 3h,这样酯化率可达 95%以上。     

卡格列净关键中间体合成研究

以对氟溴苯和2-溴噻吩为原料合成2-(4-氟苯基)噻吩(2)时,反应时间8 h,反应温度20℃时收率最高;以2和2-甲基-5-溴苯甲酸为原料合成5-溴-2-甲基苯基-2-(4-氟苯基)噻吩甲酮(4)时,反应温度20℃,反应时间10 h时收率最高;以4为原料合成2-(5-溴-2-甲基苄基)-5-(4-氟苯基)噻吩(1)时,反应温度100℃,锌粉用量为3倍物质的量时收率最高.     

2-[3-(1,3-二氧戊烷-2-基)-1-羟丙基苯基]-2-甲基丙酸乙酯的合成研究

研究了 2 - [3- ( 1 ,3-二氧戊烷 - 2 -基 ) - 1 -羟丙基苯基 ]- 2 -甲基丙酸乙酯的合成 .丙烯醛与乙二醇溴化氢溶液反应制得 2 - ( 2 -溴乙基 ) - 1 ,3-二氧戊烷 ,适宜的反应条件为 :反应温度 5～ 1 0℃ ,反应时间 5～ 6h.2 - ( 2 -溴乙基 ) - 1 ,3-二氧戊烷与 2 - ( 4 -甲酰基苯基 ) - 2 -甲基丙酸乙酯进行格氏反应制得目标产品 .制格氏试剂时反应温度 30～ 40℃ ,反应时间 2 h;格氏反应温度不超过 2 5℃ ,反应时间2 0 min.产品合成总收率 5 4 .5 % ,产品结构经 IR谱、1HNMR谱等确证 .     

正交设计优化芥菜ISSR反应体系研究

利用正交实验设计,对芥菜ISSR-PCR反应的5因素4个水平进行研究,建立了芥菜ISSR—PCR反应的最佳体系,即在20μL反应体系中,模板DNA40ng,引物10pmol,10×反应缓冲液,dNTPs为0．5m mol／L,TaqDNA聚合酶1U,Mg^2＋ 2．0mmol／L．并进一步进行梯度退火实验,找到了芥菜ISSR最适的退火温度为51℃．     

氧化钙分解人造独居石的反应机理

用XRD分析和TGDTA热分析技术研究了氧化钙分解人造独居石的反应机理·研究结果表明:在620～700℃间,氧化钙分解人造独居石的反应是3CaO+2REPO4=Ca3(PO4)2+RE2O3;当加入NaCl助剂后,在793～811℃间分解反应是15CaO+3NaCl+10REPO4=3Ca5Cl(PO4)3+5RE2O3+Na3PO4·在820℃焙烧条件下,两个分解反应同时存在,并伴随有铈的氧化反应Ce2O3+1/2O2=2CeO2发生·用FreemanCarroll方法计算出793～811℃间分解反应的表观活化能E=686kJ/mol,反应级数n=053·     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.