纳米TiO2/介孔ZSM-5协同过硫酸盐光催化降解硝基苯酚废水

以具有介孔结构的ZSM-5沸石分子筛负载纳米TiO2制备出性能良好的复合型催化材料.结合扫描电镜(SEM)、N2吸附-脱附等温线(BET/BJH模型)和X射线衍射进行表征,并将其协同过硫酸盐光催化降解硝基苯酚废水.结果表明:在pH为4.5,催化剂投加量为0.8g/L,,FeSO4为0.8g/L,Na2S2O8为1.6g/L,常温下反应240min,对硝基苯酚(50mg/L)去除率达到98.4%.     

流动注射在线液-液萃取分光光度法测定水中的痕量酚

利用组装的HA分光光度系统建立测定水体中苯酚的FIA在线液-液萃取4-AAP分光光度分析法。自行设计并研制相分隔器、相分离器和置换瓶。方法的检出限为5．0μg/L。40．0μg/L和100．0μg/L的苯酚标准溶液分析的相对标准偏差分别为8．0％和2．7％。     

2-硝基苯酚在蒙脱石修饰碳糊电极上的电化学行为研究

用微分脉冲伏安法研究了2-硝基苯酚在蒙脱石修饰碳糊电极上的电化学还原行为,提出了一种直接检 测2-硝基苯酚的伏安分析方法．优化了影响2-硝基苯酚伏安响应的各种参数,例如支持电解质、pH值、蒙脱石 用量、富集电位和时间．在1×10-7-2×10-5mol／L浓度范围内,峰电流与浓度呈良好的线性关系,开路富集4 min 后,检出限(3倍信噪比)为8×10-9mol／L．2×10-4mol／L ×2-硝基苯酚平行测定8次的相对标准偏差为3．8％．用 该修饰电极测定了实际水样中2-硝基苯酚,平均回收率为101．22％．     

光催化氧化-分光光度法测定痕量对硝基苯酚

用超细TiO2紫外光催化氧化降解反应将对硝基苯酚中的氮完全转化为硝酸盐氮，再利用硫酸肼还原、NEDD分光光度法进行定量测定。研究发现静态吸附时间为1h、TiO2的用量为0．6g／L、pH值为3．0时。对硝基苯酚降解效果最好，对硝基苯酚的检出限迭0．478μg／mL。     

吸附树脂负载铁酞菁光催化降解4-硝基苯酚

针对铁酞菁在水溶液中易于聚合而降低催化活性的问题,将铁酞菁负载在吸附树脂上,制得多相催化剂,该催化剂在可见光的照射下能有效地催化H2O2降解4-硝基苯酚.考察了可见光强度、催化剂用量、H2O2投加量、pH值、温度等因素对4-硝基苯酚去除效果的影响.结果表明:4-硝基苯酚初始质量浓度为50 mg/L,卤灯功率为50 W,催化剂投加量为2.0g/L,H2O2用量为50 mmol/L,pH为5.7,温度为40℃时,反应540 min,4-硝基苯酚去除率达到92.2％,TOC去除率达到82.5％,且催化剂具有很好的稳定性,可重复使用.     

反相高效液相色谱法测定热塑性酚醛树脂中苯酚的含量

建立了一种测定热塑性酚醛树脂中游离苯酚的反相高效液相色谱法 .采用YWGC18(5 0mmi d × 2 5 0mm ,10 μm)色谱柱 ,以甲醇 水 (体积比为 4 5∶5 5 )作流动相 ,流速为 1 0mL/min ,紫外检测波长为 2 16nm ,灵敏度为0 0 4AUFS .在 2 2 0 4～ 4 4 0 8mg/L的范围内 ,苯酚的峰面积Y与其质量浓度X的线性关系良好 ,回归方程为Y =195 0 3X +2 75 6 8(r=0 9998) .苯酚的加标回收试验的平均回收率为 99 5 % ,RSD为 1 4 % ,苯酚的最小检出量为0 8ng .与其他方法相比 ,该方法具有操作简便、线性范围广、检出限低和回收率高等特点 ,有良好的精密度和准确性     

粗糙脉孢菌产黑色素条件优化及黑色素物理特性研究

优化了粗糙脉孢菌(Neurospora crassa)AS3．1602生产黑色素的条件，结果表明，在葡萄糖0．5g/L,(NH4)2SO4 8g/L,NaCl3 g/L,CaCl2 0.1g/L、酪氨酸取饱和浓度时，有相对高的产量．对所产黑色素进行了分离纯化，并研究了其理化性质．     

单壁碳纳米管-Nafion修饰电极同时测定硝基苯酚异构体

采用单壁碳纳米管(SWCNTs)-Nafion修饰电极作为工作电极,对邻、间、对硝基苯酚进行同时测定,实现了硝基苯酚异构体不经分离同时测定.邻硝基苯酚(o-NP)、间硝基苯酚(m-NP)和对硝基苯酚(p-NP)的线性范围分别为3.0×10-5～9.0×10-5,1.0×10-5～7.0×10-5,8.0×10-6～5.0×10-5 mol/L;检出限分别为6.0×10-6,4.0×10-6,1.0×10-6 mol/L.     

一株产漆酶真菌的筛选、鉴定及发酵研究

采用愈创木酚显色法筛得一株产漆酶周期较短的丝状真菌．通过形态学观察和分子生物学序列分析,鉴定其为棘孢木霉(Trichodermaasperellum),并对所获菌株进行了发酵条件优化．通过单因素试验和正交试验获得该菌的最佳发酵条件为：蔗糖25 g/L、麸皮汁80 g/L、酒石酸铵10 g/L 和豆粕18 g/L,KH2 PO42, MgSO4?7H2 O 0．6,CaCl2?2H2 O 0．8,Cu2＋0．25(1 mM),pH 5．5~6．5,其漆酶最高酶活水平为571．32 U/L．     

三种硝基苯酚在玻碳电极上的电化学行为及机理探讨

在0 05mol／LNa2HPO4 0 05mol／LNaH2PO4 0 1mol／LKCl(pH=6 80)分析底液中于玻碳电极上研究了对硝基苯酚、邻硝基苯酚、2,4,6 三硝基苯酚的电化学行为,并对反应机理进行了探讨.     

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.