小型开放系统中铵氮对微囊藻生长的影响

研究了小型开放系统中不同浓度的铵氮对微囊藻生长的影响.在4个分别命名为N1、N2、N3、N4的水箱中,除铵氮浓度不同,其它的条件基本一致,且正磷酸盐设为足量,达到1.65mg·L-1,4个水箱中铵氮浓度分别为5.23mg·L-1,12.43mg·L-1,22.5mg·L-1,37.28mg·L-1,结果表明,铵氮浓度小于2.54mg·L-1时对微囊藻的生长起抑制作用;当浓度在7mg·L-1～15mg·L-1时,微囊藻呈暴发性生长;高于19.25mg·L-1的铵氮抑制微囊藻的生长.     

杏林湾水库水质富营养化评价

以1999年12月至2000年10月杏林湾水库调查资料为基础,利用浮游植物群落指标、营养状态指数和理化参数指标对杏林湾水库的营养水平进行评价.结果表明,杏林湾水库浮游植物密度年均达3456.77×104个/L,平均TSI为67,杏林湾水库属于蓝-硅藻型富营养型水库.     

硝态氮、氨态氮与三峡库湾水体富营养关系探析

以三峡库区瀼渡河库湾为研究对象,连续五年逐月监测水体硝态氮、氨态氮、叶绿素a浓度.采用spearman秩相关系数法分析水体富营养化与硝态氮、氨态氮的关系,结果显示硝态氮与富营养化呈负相关,氨态氮则与富营养化无显著意义,由此表明三峡库区支流库湾水体硝态氮是藻类等浮游植物繁殖吸收的主要价态氮.     

亚硝酸盐反硝化脱氮

利用单纯形优化法获得了从亚硝酸盐反硝化脱氮的工艺条件为 :pH8.3,温度 2 8℃ ,C/N比1.6 ,泥 /水比为 0 .32 ,在此条件下能够稳定、高效地处理高浓度的含氮废水 (NO2 - -N〈35 0mg·L- 1) ,其脱氮速率高达 16 2mg·L- 1·h- 1,脱氮率 >99%。     

ICEAS反应器处理城市污水的试验研究

对ICEAS工艺的处理效果进行了研究,结果表明,ICEAS既能去除污水中的有机物,还能达到脱氮除磷的效果,出水COD浓度为15 2～42 2mg·L-1,COD总去除率可达80%～88%;出水BOD5浓度为5 12～16 90mg·L-1,总去除率可达85%～93%;出水氨氮浓度为4 5～7 5mg·L-1,总去除率为60%～70%,磷的去除率为60%～75%.     

厌氧消化-化学混凝-SNAD联合工艺处理海产品加工废水

设计厌氧消化-化学混凝-SNAD联合工艺对海产品加工中的高浓泡药间废水进行处理．厌氧消化对废水中COD去除率最高可达94.37%,平均可达89.77%,有机氮与聚合磷转化为NH+4-N、PO3-4-P,浓度分别达总氮、总磷浓度的85%~90%;20 g·L-1的聚合氯化铝可实现总磷浓度1 000 mg·L-1废水的总磷去除率99.83%,出水磷浓度为1.70 mg·L-1．SNAD系统中控制温度为32~35 ℃,以空气流量10~15 mL·min-1间歇曝气(ton/toff=10 min/5 min)控制DO为0.1 mg·L-1左右,pH为7.5~8.0,HRT为24 h,运行稳定时最高可处理总氮浓度为655 mg·L-1的废水,总氮、COD去除率分别为72.71%、56.70%．高通量测序结果表明反应器内形成了SNAD系统,AOB、AnAOB和DNB含量分别为2.72%、2.09%、1.46%．     

胶州湾胶体有机碳、氮和磷的初步研究

1997年至 1998年间在青岛胶州湾对海水中的胶体有机碳、氮和磷进行了初步研究。胶体有机碳 (COC)的浓度范围为 33.9～ 5 4 .0 μmol·L-1,约占总溶解有机碳的 31%。在总溶解氮和磷中 ,胶体氮和磷均以有机物的形式存在 ,胶体有机氮 (CON)的浓度范围为 2 .13～ 4 .5 1μmol·L-1,平均 3.0 7μmol·L-1,约占总溶解有机氮 (DON)的 31%。胶体有机碳、氮、磷季节变化幅度并不很大 ,表明胶体物质在水体中输入和输出大体处于平衡状态。     

两级SBR工艺处理小城镇生活污水研究

采用两级 SBR (sequence batch reactor)工艺处理小城镇生活污水 ,试验结果表明 ,先通过 SBR1反应器对污水起到了平衡、均化作用 ,再通过 SBR2反应器实现了污水的脱氮除磷 .试验出水 ρCOD(铬法 )浓度为 2 1～ 43 mg· L-1,去除率达到 85 %～ 93 % ;出水ρ(N) (N为氨态氮 )为 3 .3～ 9.5 mg· L-1,去除率达到 65 %～ 81 % ;出水ρt(P)为 0 .3 2～ 0 .63 mg· L-1,去除率达到 87%～ 95 % .     

生态滤池污水处理过程中氮形态变化及平衡研究

污水经生态滤池(MEEF)处理后,出水中化学耗氧量(COD)、生物需氧量(BODs)、总氮(TN)和总磷(TP)的质量浓度降低,氮的形态构成与进水有较大差异.水力负荷分别为1.0 m3·m-2·d-1和2.0 m3·m-2·d-1时,进水中NH4 -N的平均质量浓度分别为45.8和35.7 mg·L-1,出水中分别降为10.3和20.0 mg·L-1;进水中NO3--N的平均质量浓度分别为0.24和0.2 mg·L-1,出水中分别增加到30.4和4.1 mg·L-1.进水中硝态氮占总氮的0.3%,在两种水力负荷下出水中硝态氮占出水总氮的比例分别增加到52.7%和12.8%,说明水力负荷降低有利于硝化作用进行.还对氮的质量平衡进行了估计,并讨论了MEEF的工作原理.     

河北省中南部农区地下水硝态氮含量特征分析

于2005和2006年沿横贯河北省中南部的北纬38°带,分别在低山丘陵、山前平原、低平原和近滨海平原冬小麦夏玉米轮作农区,采集灌溉机井水样分别为24,120,71和44个,并分析水样中的硝态氮含量.结果显示,河北省中南部农区浅层地下水硝态氮总体上达到了饮用水标准,没有发生大面积污染,但硝态氮含量空间变异很大;地下水埋深及施肥量对地下水硝态氮含量都有明显的影响;低山丘陵区硝态氮含量最高,平均含量为13.39 mg/L;山前平原区含量其次,平均含量为4.03 mg/L;低平原及近滨海平原区含量最低,平均为0.41 mg/L;低山丘陵和山前平原部分样点硝态氮含量超过饮用水标准,地下水污染明显,需要采取防治措施.     

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)

正~~     

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.