Distribution and mode of occurrence of As；Hg and Se and sulfur in coal Seam 3 of the Shanxi Formation,Yanzhou Coalfield；China

IEECAS SKLLQG

A study of the scaling height of the tropospheric aerosol and its extinction coefficient profile

IEECAS SKLLQG

网络控制下静态存储器的动态检测系统

全面地论述了网络控制下静态存储器动态检测系统的软硬件原理与特色。系统的实时测试采用了基于国际标准的 TCP/ IP协议远程网络来控制 ;系统可测试多种类型的存储芯片 ,为了在实验中同时测试存储芯片的另一空间效应 -单粒子闭锁 ,系统又集成了电源控制和电流监测部分

兰州重离子加速器冷却储存环中束流位置测量系统的研制

介绍了兰州重离子加速器冷却储存环 (HIRFL CSRm)中束流位置测量系统设计的基本原理、PICKUP探针参数的选择以及有关物理量的计算。并完成了桌上实验 ,得出了有关结论。

Frankia菌在非豆科放线结瘤植物根际内的存活与分布

提取Ｆｒａｎｋｉａ菌１６ＳｒＲＮＡ，制备具专一性的寡核苷酸探针，通过同源杂交，在人工接种的木麻黄根际内检测出痕量Ｆｒａｎｋｉｓ菌结果表明，Ｆｒａｎｋｉａ可在环境因子的作用下被动迁移不论接种点的位置如何，经６个月的时间稳定后，其分布状态基本相同，主要集中于土层下８～３０ｃｍ处

GC-MS测定土壤中阿特拉津、六氯苯等十种农药残留

建立了气相色谱-质谱-选择离子监测(GC-MS-SIM)同时测定土壤中10种农药(三嗪类除草剂、酰胺类除草剂和有机氯农药)的多残留分析方法.样品采用正己烷/丙酮(1:1,V/V)超声提取、氟罗里硅土柱层析净化、GC-MS-SIM测定.10种农药在0.01(0.02)—1.0(2.0)mg.l-1范围内线性良好,相关系数介于0.9963—0.9998之间;在10,50和250ng.g-1添加水平下,平均回收率介于81%—117%之间,相对标准偏差均小于14.4%;方法检出限达到ppb至sub-ppb级(0.1—1.3ng.g-1).将此方法应用于辽宁省不同性质土壤中70个实际土壤样品的分析,阿特拉津、乙草胺、六氯苯、丁草胺、狄氏剂和艾氏剂有检出,该法对不同性质土壤具有广泛适用性.

嫁接对茄子根际微生物种群数量的影响

研究了不同砧木、不同土壤茬口条件下嫁接茄子根际微生物的种群数量变化。结果表明: 嫁接增加了茄子根际放线菌数量(A)和真菌的数量(F),减少了细菌的数量(B),A/F比值增高,B/ F比值降低;同时,嫁接茄子根际微生物总量增加。在正茬和重茬两种耕作体系中,嫁接处理根际放线 菌数量都极显著高于对照,而细菌数量极显著低于对照;连作(重茬)条件下,茄子根际细菌和放线菌 的数量减少,真菌的数量增加。

Dinoflagellate Cysts as Indicators of Cultural Eutrophication in the Oslofjord, Norway

Dinoflagellate cyst records were analysed from four sediment cores from the inner Oslofjord. The cores covered the pre-industrial period, and the most important period of human population growth associated with industrial development of the region, from the mid-1800s to the present, including the reported development of cultural eutrophication. Comparisons between the cyst records and the known history of eutrophication suggest cyst signals that should prove useful for tracing the development of eutrophication. The eutrophication signal consisted of a doubling of total cyst concentration, and a marked increase in one species in particular,Lingulodinium machaerophorum(from <5 to around 50% of the assemblages) with increased eutrophication. In the core considered most representative of general water quality in the inner fjord, these trends reversed back to pre-industrial levels during the 1980s and 1990s when improved sewage treatment took effect.

Validation and in situ application of an automated dissolved nickel monitor for estuarine studies

The validation of a fully automated dissolved Ni monitor for in situ estuarine studies is presented, based on adsorptive cathodic stripping voltammetry (AdCSV). Dissolved Ni concentrations were determined following on-line filtration and UV digestion, and addition of an AdCSV ligand (dimethyl glyoxime) and pH buffer (N-2-hydroxyethylpiperazine-N′-2-ethanesulphonic acid). The technique is capable of up to six fully quantified Ni measurements per hour. The automated in situ methodology was applied successfully during two surveys on the Tamar estuary (south west Britain). The strongly varying sample matrix encountered in the estuarine system did not present analytical interferences, and each sample was quantified using internal standard additions. Up to 37 Ni measurements were performed during each survey, which involved 13 h of continuous sampling and analysis. The high resolution data from the winter and summer tidal cycle studies allowed a thorough interpretation of the biogeochemical processes in the studied estuarine system.