CPLD在HIRFL-CSR电源控制模块中的应用

介绍了一种采用复杂可编程逻辑器件(CPLD)实现HIRFL-CSR电源控制模块中单片机外围电路的方法,将低位地址锁存、地址译码、数据总线、分频电路、比较、计数以及逻辑电路集成于一片CPLD,大大缩小了印制板的面积并提高了系统可靠性,同时,由于CPLD的现场可编程性,使整个系统的灵活性显著增强。

晚上新世-早更新世北太平洋和黄土高原的风尘沉积记录的初步对比

IEECAS SKLLQG

Analytical solution of a multidimensional Langevin equation at high friction limits and probability passing over a two-dimensional saddle

The analytical solution of a multidimensional Langevin equation at the overdamping limit is obtained and the probability of particles passing over a two-dimensional saddle point is discussed. These results may break a path for studying further the fusion in superheavy elements synthesis.

《景观生态学原理与方法》简介

由国际著名景观生态学家、国际生态学会秘书长、意大利Ｌｕｎｉｇｉａｎａ自然博物馆主任法瑞纳（ＡｌｍｏＦａｒｉｎａ）博士撰写的又一部景观生态学力作《景观生态学原理与方法》（Ｐｒｉｎｃｉｐｌｅａｎｄｍｅｔｈｏｄｓｉｎｌａｎｄｓｃａｐｅｅｃｏｌｏｇｙ）已于１...

北方高渗漏稻田阻渗节水效果

为了减少北方高渗漏稻田的过量水分流失,利用2001～2002年在中国科学院沈阳生态实验站水田试验基地开展的稻田土壤阻渗试验,分析了四种处理(包括对照、薄膜阻渗、厚膜阻渗和犁底层夯实阻渗处理)的阻渗效果。结果表明．与对照处理相比,厚膜和夯实两种处理均表现出良好的阻渗效果,节水量在400～500mm之间,节永达50％以上。为了有效指导开展北方节水稻作,在最后指出今后在水稻生产中应注意的一些问题。

Evidence for perimeter sites over SmOx-modified Rh(100) surface by CO chemisorption

SmOx modified Rh(l 0 0) surfaces have been in-situ prepared by depositing metallic Sin and subsequently oxidizing under controlled conditions, and the interaction between the lanthanide oxide and transition metal has been characterized by means of X-ray photoelectron spectroscopy (XPS) and high-resolution electron-energy-loss spectroscopy (HREELS) as well as thermal desorption spectroscopy (TDS). As evidenced, the adsorption of CO on the modified surfaces shows some different features to the original surface of Rh(l 00). The covering of SmOx blocks some sites on the surface and consequently suppresses adsorption of the typical CO species with an uptake at about 500 K, while a novel desorption peak centered at 260 K emerges in the CO TDS. Correspondingly, the XP spectrum exhibits a new C Is peak at 287.9 eV and 0 Is peak at 532.6 eV. The intensity of the low temperature peak varies with the coverage of SmOx, which shows an actual correlation to the perimeter sites of SmOx particles on the surface. (C) 2004 Elsevier B.V. All rights reserved.

长白山阔叶红松林太阳辐射分光谱特征

根据对林冠上方和林下太阳辐射的观测及气象站资料,分析了长白山阔叶红松林太阳辐射分光谱特征.结果表明,长白山阔叶红松林区太阳总辐射、直接辐射、散射辐射的光合有效辐射系数有一定的日变化和年变化,年平均值分别为046、043、056.阔叶红松林中不同树种的单叶对于太阳总辐射的反射率、透射率、吸收率的平均值分别为270%、234%、496%.单叶的分光谱反射、透射和吸收的特点是,单叶对紫外辐射几乎全部吸收;对光合有效辐射的吸收也很大(718%),透射很小(96%),有一定的反射(186%);对近红外辐射、反射率和透射率接近吸收率小些(269%).林冠分光谱辐射特点是,可见光和紫外辐射主要被林冠吸收(939%、941%),有少量反射和透过;林冠对近红外辐射的吸收较大(592%),有一定的反射(263%),透过较少(144%).

Development of a precolumn derivatization method for the determination of free amines in wastewater by high-performance liquid chromatography via fluorescent detection with 9-(2-hydroxyethyl)acridone

A simple, sensitive, and mild method for the determination of amino compounds based on a condensation reaction with fluorescence detection has been developed. 9-(2-Hydroxyethyl)acridone reacts with coupling agent N,N-carbonyldiimidazole at ambient temperature to form activated amide intermediate 9-(2-acridone)oxyethylcarbonylimidazole (AOCD). The amide intermediate (AOCD) preferably reacts with amino compounds under mild reactions in the presence of 4-(dimethylamino)pyridine (base catalyst) in acetonitrile to give the corresponding sensitively fluorescent derivatives with an excitation maximum lambda(ex) 404 mn and an emission maximum at lambda(em) 440 nm. The labeled derivatives exhibit high stability under reversed-phase conditions. The fluorescence intensities of derivatives in various solvents or at different temperatures were investigated. The method, in conjunction with a gradient elution, offers a baseline resolution of the common amine derivatives on a reversed-phase C-18 column. The LC separation for the derivatized amines shows good reproducibility with acetonitrile-water including 2.5% DMF as mobile phase. The relative standard deviations (n = 6) for each amine derivative are <4.5%. The detection limits (at a signal-to-noise ratio of 3) per injection were 0.16-12.8 ng/mL. Further research for the field of application, based on the AOCD amide intermediate as derivatization reagent, for the determination of free amines in real water samples is achieved.

黑龙江省东部山区谷地云冷杉林衰退与其生境条件的相关性

对黑龙江省伊春林区的凉水国家级自然保护区的云冷杉林进行了调查。根据pH值、阳离子代换量、营养元素、微生物数量及云杉根部着生小斑块的大小等,分析了黑龙江省东部山区谷地云冷杉林的衰退原因。结果表明:土壤pH值与云杉死亡没有明显关系;土壤阳离子代换量低是云杉死亡的一个因素;云杉衰退与营养元素的吸收及微生物数量无明显关系;云杉的生长与根部着生小斑块的大小存在密切的相关关系,斑块越大,云杉长势越好,生存周期也更长。

Sustainable development of coastal and marine areas in small island developing states: A basis for integrated coastal management

Agenda 21, the 40-chapter action plan, agreed to by all nations participating in the 1992 Earth Summit represents an ambitious effort to provide policy guidance across the entire spectrum of environment, development, and social issues confronting mankind. In the area of oceans and coasts (Chapter 17 of Agenda 21), the Earth Summit underscored that the management of oceans and coasts should be ‘integrated in content and anticipatory in ambit.’ To assist those responsible for implementing the Earth Summit guidelines on ocean and coastal management, this article first reviews the fundamental shift in paradigm reflected in the Earth Summit agreements as well as the specific recommendations contained in Chapter 17. Next, the article examines the central concept of ‘integrated management,’ noting both its importance and its limits. A general or ‘synthesis’ model of ‘integrated coastal management’ is then presented, addressing such questions as management goals, what is being managed, where, how, and by whom. In a concluding section, methods are proposed whereby the general or ‘synthesis model’ can be tailored to diverse national contexts, involving varying physical, socio-economic, and political conditions.

喀斯特地区原状土的可蚀性

研究喀斯特地区原状土的可蚀性,有助于掌握土壤抗蚀的本底特征,对比研究耕作前后的土壤可蚀性变化,揭示人类加速侵蚀对石漠化过程的影响。通过对喀斯特地区原状土壤剖面的调查,分析土壤质地、有机质含量,选用Sharply等的EPIC模型,计算土壤可蚀性K值。结果表明:喀斯特地区原状土壤可蚀性K值集中在0.2~0.3之间,平均为0.269,比其他常见土壤的K值低。研究结果可用于与耕作土K值进行对比研究。

GIS接受外部空间数据的初步探讨——兼论ARC/INFO~的数据接受方式

数据是地理信息系统 (GIS)应用的核心。现实世界的数据具有普遍的多样性 ,关于 GIS接受不同数据的研究已成为当前 GIS研究中的一个难点和热点。从常见空间数据类型的格式、GIS接受外部空间数据的方式以及 GIS接受外部空间数据中的数据精度、比例尺、坐标变换等几个方面 ,对外部空间数据处理系统的数据向 GIS转换的问题进行了探讨 ,同时以通用 GIS工具软件 ARC/INFO为例分析了其接受外部矢量空间数据的方式。

石油污染土壤长料堆式异位生物修复技术研究

应用长料堆式处理技术在长 2 0m、宽 10m的实用规模预制床上对辽河油田不同类型原油污染土壤进行了处理 .处理工程设 8个长条状堆料单元 ,每个堆料单元长 8m、宽 2m、高 0 .35m .当稀油、稠油和高凝油污染土壤中石油烃总量 (TPH)为 4.16～ 7.72 g·10 0 g-1土时 ,经过 5 3d的运行 ,TPH去除率 45 .19%～ 5 6 .74% .本研究为石油污染土壤异位生物修复实用化提供了技术支持 .

西气东输河南至上海工程段沿线土壤扰动及其对农田生态系统的影响

通过对西气东输工程河南—上海段沿线的土壤和植被进行勘察、取样和测试,分析同一地点作业带和非作业带的土壤质量状况、农作物的生长对比情况,进而分析工程施工过程中对土壤扰动的情况,及其给农田生态系统带来的影响。结果表明,在施工过程中,机械装置对土壤产生的压实效应及弃土弃渣的推放等,对土壤生态环境带来一定的破坏,土壤质量有不同程度的下降,进而影响了作物的生长,使相关的生态系统也遭到不同程度的破坏。提出了应加大对作业带土壤有机肥(尤其是作物秸秆)的施用,以改善、恢复和提高土壤生态环境质量。