乙醇脱除魔芋粗粉三甲胺异味的效果研究

为研究乙醇浸提因素对魔芋粗粉中三甲胺提取率的影响,以较低的乙醇体积分数、浸提时间和浸提温度为试验因素,以分光光度法测定三甲胺的提取率,在单因素试验的基础上进行正交试验,运用综合评分法和正交试验结果分析.结果表明乙醇浸提魔芋粗粉中三甲胺提取率最优的工艺条件为:乙醇体积分数为30%,浸提时间为4 h,浸提温度为60℃.     

三甲胺催化多聚甲醛与正丁醛制备2,2-二羟甲基丁醛

以多聚甲醛为原料,在三甲胺的催化下与正丁醛发生羟醛缩合反应制备2,2-二羟甲基丁醛.GC、GC-MS分析发现2,2-二羟甲基丁醛为主产物、2-乙基丙烯醛为最主要的副产物.通过对无机碱、有机碱催化剂进行筛选,发现三甲胺水溶液为较优催化剂.当以10%的水为反应溶剂,多聚甲醛∶正丁醛∶三甲胺=2.5∶1.0∶0.050(摩尔比)时,在80℃反应2 h后,正丁醛转化率为91%,2,2-二羟甲基丁醛的选择性为78%,得率为71%.以固体甲醛替代甲醛水溶液有利于减少含醛废水的排放,符合绿色化学的发展趋势.     

氯化胆碱合成新工艺研究

本文研究了以大孔强碱阴离子交换树脂为催化剂,氯乙醇和三甲胺为原料合成氯化胆碱的新工艺,在优化条件下,产率可达99%以上.     

分光光度法测定洋葱中微量锗

用苯芴酮—溴化十六烷基三甲胺分光光度法测定洋葱中的微量锗 ,不经萃取分离 ,有色溶液在 5 12 nm处比色。分析方法的线性范围为 0 .0 - 2 .5 μg/m L,获得较满意结果     

3-氯-2-羟丙基三甲基氯化铵的合成工艺

以环氧氯丙烷、三甲胺、浓盐酸为原料 ,合成了 3 氯 2 羟丙基三甲基氯化铵。研究结果表明 ,最佳合成工艺条件 :环氧氯丙烷与三甲胺盐酸盐的量之比为 0 .95∶1,反应 pH起始值为 7.5～ 8.0 ,反应温度采用分段 (10 ,35℃ )控制。使用合适的催化剂 ,反应收率可达 96 %以上。对三甲基氯化铵溶液中的微量有机杂质环氧氯丙烷和 1,3 二氯丙醇进行了分析 ,并采用连续水汽精馏对产品进行了纯化处理。纯化后的产品中 ,三甲基氯化铵的质量分数为6 9% ,环氧氯丙烷的质量分数小于 0 .0 0 0 5 % ,1,3 二氯丙醇的质量分数小于 0 .0 0 15 %。     

季胺淀粉醚生产控制分析方法的研究

本文研究了用佛尔哈德法测定1,2-环氧丙基三甲胺氯含量的方法,井通过对减压蒸馏后的剩余物的对照取样测定,得出季胺淀粉醚生产过程中其它产物对本测定方法无影响的结论.所拟方法简单,且准确度高.     

鱼粉加工废气中污染物成分分析与三甲胺含量测定

鱼粉加工过程产生难闻废气,污染环境.采用加热蒸馏法模拟鱼粉加工产生废气,通过气相色谱-质谱法分析其成分,检测出24种有机物,其中含氮、含硫等9种有机物含量较高;应用三甲胺标准气体建立了气相色谱法检测三甲胺工作曲线,3次检测结果为:鱼溶浆蒸馏废气中三甲胺含量范围为6279.41～8981.59 mg/m3,平均含量为75...     

贵州茶叶中微量锗含量测定

用苯芴酮－溴化十六烷基三甲胺分光光度法测定贵州省13种茶叶样品中微量锗的含量，结果显示，13种茶叶祥品含锗量均较高，平均值为2.24μg/g，其中最高含量到4.57μg/g.     

双硫腙-乙醇体系分光光度法测锌的研究

探讨了在表面活性剂作用下 ,用双硫腙 -乙醇体系分光光度法测定样品中微量锌的条件及应用 .实验结果表明 :在 p H6.5～ 6.8的溶液中加入掩蔽剂 ,在有表面活性剂溴化十六烷基三甲胺 ( CTMAB)的存在下 ,锌 ( II)与双硫腙形成稳定的紫红色络合物 ,其络合比为 1∶ 2 ,最大吸收波长为 5 90 nm,表观摩尔吸光系数为 9.2 2× 1 0 4 L· mol- 1 · cm- 1 ,锌含量在 7.5～ 3 0μg/ 5 0 m L范围内服从比耳定律 .此法操作简便 ,显色稳定 ,灵敏度高 ,选择性好 ,可用于水样中锌的测定 ,回收率在 97.0 %～ 1 0 0 .7%之间     

离子交换树脂催化剂法合成氯化胆碱新工艺的研究

本文研究了以三甲胺和氯乙醇为原料 ,阴离子交换树脂为催化剂合成氯化胆碱的工艺条件。催化剂可循环使用 ,产品收率达 99.5%。     

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).     

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.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.