紫外线法对压载水中淡水藻的灭活效果研究

按照《船舶压载水和沉积物控制和管理国际公约》对岸基测试试验的要求,采用准平行光束仪对8种淡水藻辐射,黑暗环境培养5d,确定剂量反应关系,研究紫外线对它们的灭活效果及特点.结果表明,紫外线法对梅尼小环藻、谷皮菱形藻、小球衣藻和铜绿微囊藻具有一定的灭活效果,灭活率随着紫外线剂量的增加而提高;小剂量的紫外线会刺激镰形纤维藻和斜生栅藻细胞生长,在剂量大于300 mJ·cm-2时藻细胞的数量开始缓慢减少;剂量小于400 mJ·cm-2时对钝脆杆藻和卵形隐藻没有灭活效果.紫外线对淡水藻的灭活效果较差.藻细胞个体大小不是影响紫外线灭活效果的原因,藻的种类、藻细胞壁的有无及其成分的不同可能是造成不同灭活效果的原因.     

工艺处理过程中病毒的灭活效果研究

摘要: 目的 探究工艺处理对不同病毒的灭活效果及清除能力,为清除动物源性产品中病毒污染提供有效的灭活 方法。方法 选用新城疫病毒,人轮状病毒,伪狂犬病毒,猪细小病毒四种病毒作为指示病毒,加入所选材料中,经 草酸和盐酸的清除工艺后,计算病毒初始及处理后的病毒滴度,总结工艺灭活效果。结果 经过 10% 草酸 1． 5 h 处理后,病毒滴度明显下降,但并未完全灭活; 继续经过 10% 盐酸处理 1h 后,病毒滴度下降到零,病毒完全灭活。 结论 该酸处理工艺可以有效地清除病毒,达到良好的灭活效果,保证产品的安全性。     

紫外线照射对铜绿微囊藻活性的影响

以铜绿微囊藻为研究对象,考察了紫外线照射对铜绿微囊藻的灭活效果及光合活性的影响,并研究了经紫外线照射后藻溶液水质的变化情况.结果表明,紫外线对铜绿微囊藻的灭活效果随着紫外线剂量的增大而提高,而光合活性随着紫外线剂量的增加呈指数下降;在藻浓度为35×108个.L-1条件下,91.8mJ.cm-2的紫外线剂量即可对其产生有效的抑制作用,紫外线照射时间10min是抑制藻类生长的最佳时间;藻的浓度对紫外线灭活藻有一定影响,紫外线对高浓度藻灭活效果明显;紫外线照射对藻液的UV254影响较小,但藻液的DOC(溶解性有机碳)随着紫外线剂量的增加呈现先增大后降低的趋势.     

酿酒酵母的双亲株原生质体灭活融合研究

把两株酿酒酵母(saccharomyces cerevisiae)S_1、S_2的原生质体分别用紫外线(U.V)和碘乙酰胺灭活或只用紫外线灭活,经PEG诱导融合后,在完全培养基上得到了融合子。融合频率为(0.98-2.13)×10~(-7)。融合子的细胞形态、DNA含量等都和亲株有明显差别,并在生产特性上有某些改进。     

3种不同前处理方法测定底泥中的铅和镉对比研究

采用3种不同方法对北京工商大学中水站污泥进行了前处理,采用原子吸收光谱法测定铅和镉的含量,实验结果表明:由于干法消解温度较高,可以消解的更加完全,其效果要好于湿法消解,但干法消解时间过长则可能引起重金属成分的挥发损失,降低消解效果。     

饮用水中隐孢子虫的紫外线灭活

介绍了隐孢子虫的生活形态以及隐孢子虫病的传播情况，通过对欧美等国爆发的隐孢子虫病的分析，指出传统的水处理工艺不能有效地去除侵入水中的隐孢子虫卵囊，应该对现有的处理系统进行改造．紫外线灭活隐孢子虫研究的进展情况表明，紫外线对其的灭活率达到99％和99．99％时，紫外线剂量分别为11mJ/cm^2和19mJ／cm^2．最后建议确定简单合理的检测方法，并加强紫外线灭活污水中隐孢子虫的研究．     

灭活仙台毒疫苗对大鼠感染仙台毒的保获作用

<正> 小鼠仙台毒感染曾打算用灭活病毒疫苗,用温度敏感的变种病毒及用有佐剂的灭活苗来予防。但很少研究仙台毒疫苗对大鼠的效力及安全性。上文中曾报导仙台毒用吐温80,乙醚,福马林及紫外线结合处理灭活后可使鼠产生血清抗体并由接种疫苗的母鼠把抗体转给其仔代。本文报导这种疫苗的效力。研究用的大鼠为该所繁殖的五周令Wistar大鼠,公母均有。种鼠群(用检查淘汰种鼠血清学监测的方法来证明)无仙台     

干法灰化-ICP-AES法测定奶粉中的磷

用干法灰化法处理奶粉样品,电感耦合等离子体发射光谱法（ICP-AES）测定了样品中磷的含量,并研究了干法灰化最佳温度和仪器最佳工作条件.本法与其他方法比较,处理样品方法简单、快速,测定结果准确可靠,方法检出限为0.0505 mg/L,回收率为95.8%—105.2%.     

氯和二氧化氯联合消毒灭菌作用的研究

以配置的水样为研究对象考察了氯与二氧化氯单独及联合灭活大肠杆菌和细菌总数的效果,用Berenbaum公式判断了两种消毒剂联合作用的性质.结果表明,氯2.00mg/L作用30 min可灭活试验水样中大肠杆菌6.18个数量级,二氧化氯0.30 mg/L作用15min、1.50mg/L氯和0.20 mg/L二氧化氯联合作用10 min可以灭活试验水样中大肠杆菌7.18个数量级(100%灭活);2.00 mg/L氯单独作用30 min、0.30 mg/L二氧化氯单独作用15 min、1.50 mg/L氯和0.20 mg/L二氧化氯联合作用10min可将水样中的细菌100%灭活.用Berenbaum公式计算得出氯与二氧化氯联合消毒灭活水样中大肠杆菌时质量浓度比为0.39,灭活水样中细菌总数时的质量浓度比为0.85,因此氯与二氧化氯联合消毒对大肠杆菌和细菌总数具有协同灭活作用.     

藻酸盐印模表面HBsAg的临床消毒效果研究

目的:研究各种临床消毒方法对藻酸盐印模的消毒效果。方法:选用1500mg/L的NaClO消毒液、2%中性强化戊二醛消毒液和臭氧消毒表面污染有乙肝病毒血清的藻酸盐印模进行浸泡消毒,检测消毒效果。结果:1500mg/L的NaClO消毒液浸泡消毒10min可完全灭活HBsAg;2%中性强化戊二醛消毒液浸泡消毒40min可完全灭活HbsAg,臭氧消毒60min仍无效。结论:1500mg/L的NaClO、2%中性强化戊二醛消毒液均可灭活HBsAg。     

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.