检索结果-南通市图书馆

Journal of Environmental Sciences 2005年第5期17卷 802-807页

作者： Muhammad Akmal wang hai-zhen WU Jian-jun XU Jian-ming XU De-fu Institute of Soil and grater Resources and Environmental Science Zhejiang University Hangzhou 310029 China

Heavy metal pollution has received increasing attention in recent years mainly because of the public awareness of environmental issues. In this study we have evaluated the effect of cadmium （Cd） on enzymes activity, substrate utilization pattern and diversity of microbial communities in soil spiked with 0, 20, 40, 60, 80, and 100 mg/kg Cd, during 60 d of incubation at 25℃. Enzyme activities determined at 0, 15, 30, 45, and 60 d after heavy metal application（DAA） showed marked declines for various Cd treatments, and up to 60 DAA, 100 mg/kg Cd resulted in 50.1%, 47.4%, and 39.8% decreases in soil urease, acid phosphatase and dehydrogenase activities, respectively to control. At 60 DAA, substrate utilization pattern of soil microbial communities determined by inoculating Biolog ECO plates indicated that Cd addition had markedly inhibited the functional activity of soil microbial communities and multivariate analysis of sole carbon source utilization showed significantly different utilization patterns for 80 and 100 mg/kg Cd treatments. The structural diversity of soil microbial communities assessed by PCR-DGGE method at 60 DAA, illustrated that DGGE patterns in soil simplified with increasing Cd concentration, and clustering of DGGE profiles for various Cd treatments revealed that they had more than 50% difference with that of control.

关键词： enzyme activity microbial community soil cadmium

FORECAST ON FUTURE LEVEL OF ECONOMY DEVELOPMENT OF CHINA

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Chinese Geographical Science 2002年第4期12卷 294-298页

作者： wang Dian -hai,LI zhen -fu(School of Communication,Jilin Univ ersity,Changchun 130025,P.R.Chin a) School of Communication Jilin University Changchun P. R. China

China is a country in the period of economy takeoff. We cannot use the commonmethod to forecast its future economy level. This paper establishes an economic level forecastmodel of the countries whose economy is in the take off because of the stimulation of model *** enlightenment of the model is from physics. If there are two substances, A and B, and a mediumbetween them, according to physics, when substance A is hotter than B, B's temperature willinevitably rise and close to that of A. Thus, this system tends to be a state of balance. Threefactors affect heat conduction between substance A and B. They are the difference of temperaturebetween two substances, the conductivity of medium and the characteristics of themselves. The modelis testified through two examples. And then we forecast the economic development level of China inlong term. This paper raises a model to solve the problem of research approaches. However, sincethere are some limitations on data source, problems will appear. For example, in certain years, ourforecast results do not suit the real situation. But in the long term, the tendency is *** this model can be amended in accordance with different situations.

关键词： forecast economy takeoff model country

Response of Rice Varieties to Bound Residues of Metsulfuron-Methyl in a Paddy Soil

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Pedosphere 2007年第4期17卷 487-492页

作者： LI Zhao-Jun wang hai-zhen XU Jian-Ming WU Jian-Jun MA Guo-Rui Institute of Soil and Water Resources and Environmental Science Zhejiang University Hangzhou 310029 （China）. Institute of Agricultural Resources and Regional Planning Ministry of Agriculture Key Laboratory of Plant Nutrition and Nutrient Cycling Chinese Academy of Agricultural Sciences Beijing 100081 （China）

Metsulfuron-methyl is one of the widely used sulfonylurea herbicides. However, approximately half of the applied metsulfuron-methyl may remain as bound residues in soil. To characterize the response of rice plants to residual metsulfuron-methyl in soil, the activities of acetolactate synthase （ALS）, superoxide dismutase （SOD）, peroxidase （POD）, and catalase （CAT） were investigated in two rice varieties that differed in susceptibility to the herbicide. Changes in the activity of these enzymes in leaves and roots of Xiushui 63, a sensitive rice variety, were greater than those in a resistant variety zhenong 952. Irrespective of variety, changes in the enzyme activity were greater in the roots than in the leaves. The activities of ALS and CAT decreased, while the SOD activity increased with the increase in the amounts of bound residues of metsulfuron-methyl （BRM） in soil. The POD activity increased at the BRM level of 0.025 mg kg^-1, but decreased at the BRM level of 0.05 mg kg^-1. The results showed that the bound residues of sulfonylurea herbicides may affect metabolism of rice plants.

关键词： ALS activity bound residues CAT activity metsulfuron-methyl SOD activity

Photosynthetic Characteristics and Antioxidative Metabolism of Flag Leaves in Responses to Nitrogen Application During Grain Filling of Field-Grown Wheat

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Agricultural Sciences in China 2008年第2期7卷 157-167页

作者： CAI Rui-guo ZHANG Min YIN Yan-ping wang Ping ZHANG Ti-bin GU Feng DAI Zhong-min LIANG Tai-bo WU Yun-hai wang zhen-lin State Key Laboratory of Crop Biology/Agronomy College Shandong Agricultural University/Key Laboratory of Wheat Cultivation Physiology and Genetic Improvement Ministry of Agriculture Tai＇an 271018 PR.China

A two-factorial experiment was conducted with two wheat cultivars, SN1391 （large spike and large grain） and GC8901 （multiple spike and medium grain）, and two nitrogen （N） application rates （12 and 24 g N m^-2）, to investigate the responses of photosynthetic characteristics and antioxidative metabolism to nitrogen rates in flag leaves of field-grown wheat during grain filling. The results showed that the content of N and chlorophyll （Chl） in wheat flag leaves decreased after anthesis and the net photosynthetic rate （Pn）, effective quantum yield of PS Ⅱ （Фps n）, efficiency of excitation capture by open PS Ⅱ reaction centers （Fv′/Fm′）, and photochemical quenching coefficient （qp） began to decrease at 14 days after anthesis. However, the maximal efficiency of PS Ⅱ photochemistry （Fv/Fm） decreased slightly until the late period of senescence and the nonphotochemical quenching coefficient （NPQ） increased during flag leaves＇ senescence, As a result, a conflict came into being between absorption and utilization to light energy in flag leaves during senescence, which might accelerate the senescence of flag leaves. Compared with GC8901, the lower plant population of SN1391 during grain filling was helpful to maintain the higher content of photosynthetic pigment, activity of PS II, and Pn in flag leaves during senescence, The delayed decrease in antioxidative enzyme activity and the lower degree of membrane lipid peroxidation in the senescing leaves of SN1391 were beneficial to protect the photosynthetic apparatus, which lead to the prolonged duration of CO2 assimilation. With the increase of N application, the Chl content of SN1391 flag leaves and the efficiency of excitation captured by open PS Ⅱ centers increased. At the same time, the thermal dissipation in SN1391 flag leaves at high N （HN） treatment decreased and Фps Ⅱ improved greatly, which were favorable to the increase of Pn. The SOD, POD, CAT and APX activities in the flag leaves of SN1391 increased markedly at HN tr

关键词： wheat (Triticum aestivum L.) photosynthetic characteristics antioxidative metabolism nitrogen

公共职位数量规模的研究视角及配置均衡点分析

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江苏行政学院学报 2011年第2期 97-102页

作者：王振海青岛行政学院山东青岛266071

随着公务员报考热的持续升温和行政成本的不断攀升,公共职位数量规模问题日益成为社会热点话题。在国外,公共职位数量规模问题一直为公共管理领域所关注,出现了多个流派。我国学界对这一问题的研究多集中在实证领域,关注点在于量化演变... 详细信息

随着公务员报考热的持续升温和行政成本的不断攀升,公共职位数量规模问题日益成为社会热点话题。在国外,公共职位数量规模问题一直为公共管理领域所关注,出现了多个流派。我国学界对这一问题的研究多集中在实证领域,关注点在于量化演变趋势、配置模型设计及可操作性的控制对策。实践表明,还需要对公共职位配置均衡点的问题进一步探索,寻找其均衡配置的合理向度。

关键词：公共职位优化配置均衡点

传统观念弱化了辱虐管理的消极影响吗?——传统性的两阶段调节效应研究

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经济管理 2020年第2期42卷 127-143页

作者：王海珍兰州大学管理学院

以往研究认为持传统观念的员工(即传统性较高的员工)较少受到辱虐管理的消极影响,即认为传统性缓解了辱虐管理对上下级互动关系的消极影响,然而传统性缓解还是加剧了辱虐管理对员工心理福祉造成的损伤,传统性又如何影响员工心理福祉损... 详细信息

以往研究认为持传统观念的员工(即传统性较高的员工)较少受到辱虐管理的消极影响,即认为传统性缓解了辱虐管理对上下级互动关系的消极影响,然而传统性缓解还是加剧了辱虐管理对员工心理福祉造成的损伤,传统性又如何影响员工心理福祉损伤与行为偏差之间的关系,这些问题没有得到关注。本文利用117份MBA学生两期调研数据和202份领导-员工配对数据进行研究发现:(1)辱虐管理与员工人格解体具有显著的正相关关系;(2)传统性加强了辱虐管理与人格解体之间的正相关关系;(3)传统性削弱了人格解体与人际指向偏差行为之间的正相关关系。与以往认为传统性缓解了辱虐管理消极影响的研究不同,本研究发现传统性加强了辱虐管理对员工心理福祉的损害,但削弱了心理福祉损伤与人际指向偏差行为之间的关系。

关键词：辱虐管理传统性人格解体人际指向偏差行为

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真核生物mRNA 3′非翻译区的功能

生物化学与生物物理进展 2008年第9期35卷 980-985页

作者：王海震王莹刘定干中国科学院上海生物化学与细胞生物学研究所上海200031

真核生物mRNA的3′非翻译区的功能复杂多样,不仅能调控其mRNA的稳定性、控制mRNA的亚细胞定位,而且还在特定氨基酸的编码过程中起着指导作用.一些真核生物mRNA的3′非翻译区内的突变可引起疾病的发生.近几年的研究又发现,一些真核生物m... 详细信息

真核生物mRNA的3′非翻译区的功能复杂多样,不仅能调控其mRNA的稳定性、控制mRNA的亚细胞定位,而且还在特定氨基酸的编码过程中起着指导作用.一些真核生物mRNA的3′非翻译区内的突变可引起疾病的发生.近几年的研究又发现,一些真核生物mRNA的3′非翻译区还具有抑制肿瘤生长的功能.

关键词： mRNA 3′非翻译区功能

融合傅里叶描述子和尺度不变特征转换特征的商标检索

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计算机应用 2011年第12期31卷 3395-3398,3406页

作者：王振海临沂大学信息学院山东临沂276005

针对传统商标检索算法中全局特征容易造成误检,而局部特征SIFT对轮廓描述能力不强及算法复杂度高的问题,提出了一种融合图像全局特征和局部特征的商标检索算法。其中全局特征反应了图像的整体信息,这些信息可用来较快地建立候选图像库,... 详细信息

针对传统商标检索算法中全局特征容易造成误检,而局部特征SIFT对轮廓描述能力不强及算法复杂度高的问题,提出了一种融合图像全局特征和局部特征的商标检索算法。其中全局特征反应了图像的整体信息,这些信息可用来较快地建立候选图像库,而局部特征则可以更准确地与候选图像进行匹配。首先提取图像的傅里叶描述子进行初步检索,并按相似度排序,然后在此结果集的基础上对候选图像通过提取SIFT特征进行精确匹配。实验结果表明,该方法既保持了SIFT特征较高的查全率和查准率,优于傅里叶描述子单一特征,而且检索速度比SIFT单一特征显著提高,能很好地应用于商标图像检索系统中。

关键词：基于内容的图像检索商标傅里叶描述子尺度不变特征转换全局特征局部特征

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中国政治学变革的理路与指向探析

学习与探索 2008年第6期 27-31页

作者：王振海中共青岛市委党校青岛行政学院山东青岛266071

回顾总结改革开放30年来政治学的发展历程,最重要的是在借鉴历史的基础上,寻求这一学科未来的发展理路与指向。与政治体制改革和政治发展需求相呼应,政治学也面临新的拐点:一要关注市场化进展,追寻破解市场发展阻力的良方,向权力阐明真... 详细信息

回顾总结改革开放30年来政治学的发展历程,最重要的是在借鉴历史的基础上,寻求这一学科未来的发展理路与指向。与政治体制改革和政治发展需求相呼应,政治学也面临新的拐点:一要关注市场化进展,追寻破解市场发展阻力的良方,向权力阐明真理,为市场清理道路;二要关注法治化进程,探索建立民主、宪政、法治三位一体的现代政治体制;三要坚持理性化方向,保持独立的学术立场,客观冷静地进行政治解释与政治阐述;四要倡导科学化,不断更新自己的方法工具,以开放的胸怀对待和接纳来自各方面的知识体系,促进学科的持续发展。

关键词：中国政治学政治体制改革市场化法治化理性化科学化

近距离煤层上覆采空区积水音频电探测与治理技术

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煤炭工程 2016年第8期48卷 68-70页

作者：王贞海山西省煤炭工业厅煤炭资源地质局山西太原030045

介绍了矿井音频电透视技术的原理与布置方法,并采用该技术对河峪煤矿综采工作面上覆近距离煤层采空区积水进行超前探测,通过探测发现该综采工作面上覆采空区存在3个积水异常区域,在此基础上,设计采空区积水疏放工程对积水异常区域进行疏... 详细信息

介绍了矿井音频电透视技术的原理与布置方法,并采用该技术对河峪煤矿综采工作面上覆近距离煤层采空区积水进行超前探测,通过探测发现该综采工作面上覆采空区存在3个积水异常区域,在此基础上,设计采空区积水疏放工程对积水异常区域进行疏放,累计放水量达到7800m3。工程实践证明音频电透视技术可有效探测出采空区积水量和积水范围,探测结果准确可靠。

关键词：近距离煤层采空区积水音频电透视探放水含水层