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991.
Photochemical surface modification of poly(arylsulfone) ultrafiltration membrane and covalent immobilization of enzyme 总被引:1,自引:1,他引:0
The sensitivity of poly(arylsulfone)(PSf) for UV irradiation in different solvents(water and ethanol) was investigated. It is confirmed that acrylic acid(AA) and acrylamide(AAm) are grafted only onto the surface of the membrane instead of the interior by FTIR and scanning electron microscope(SEM). The membrane performance (ΔJ/J0 and contact angle θ) after photografting was studied. In the range of conditions used, the grafting yield increases with irradiation time and monomer concentration growing. After photografting and N-3-dimethylaminopropyl-N‘-ethycarbodiimide hydrochloride(EDC) activation, PSf membrane was immobilized with hydrogen peroxide oxidoreductase, and showed a higher activity than the control membrane. 相似文献
992.
993.
采用生物行为传感器监测青鳉鱼在重金属铜暴露下的行为数据,分析不同暴露浓度(20、10、5、1和0.1 TU)下青鳉鱼的行为响应。20、10、5、1和0.1 TU的暴露浓度下青鳉鱼对重金属污染的行为反应模式符合环境胁迫阈值模型,且不同浓度梯度重金属对青鳉鱼产生不同的行为毒性效应。利用重金属作用下青鳉鱼的行为变化来研究重金属环境胁迫导致的生物行为响应机制,从而得到重金属暴露下生物行为的实时变化过程和趋势,可对水环境生态系统质量进行综合评价。 相似文献
994.
洗涤剂富磷污染及其对策 总被引:8,自引:0,他引:8
介绍了国内湖海水域富磷污染的现状,指出含磷洗涤剂的使用是造成富磷污染的主要原因,提出了解决富磷污染的对策及适合中国国情的洗涤剂发展方向。 相似文献
995.
Qu Wei He Deliang Guo Yanni Tang Yining Song Ren-Jie 《Environmental science and pollution research international》2019,26(21):21189-21200
Environmental Science and Pollution Research - By a simple and convenient method of using epichlorohydrin as linkages, a novel Alternanthera philoxeroides (AP) derivative modified with... 相似文献
996.
选取典型工业区,汇总了恶臭污染的突发性、排放不规律、夜间高值显著等特征,分析了由化学特性、物质种类和监控要求等带来的恶臭污染监测难点。根据信访投诉、地理特点和大气扩散规律,提出构建工业区恶臭污染自动监控体系。在恶臭污染排放特征分析基础上,筛选优控污染物,优选适用在线监测技术,建设边界监控为主、园区监测为辅的专业化、自动化大气特征污染监测系统,通过统一联网和平台,统一质控和规范,建立预警监测信息平台。在实际构建与应用的过程中,探索了分级管理、多方合作的运行机制,为工业区恶臭污染分析评估、污染溯源和控制提供了技术支持。 相似文献
997.
998.
Examining the interpersonal process and consequence of leader–member exchange comparison: The role of procedural justice climate
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Individuals are always sensitive to their relative standing in interpersonal comparison processes of leader–member exchanges (LMXs) in teams. Little research, however, has investigated whether coworkers with a higher LMX influence the emotional and behavioral reactions of individuals with a lower LMX in different dyads. Drawing on social comparison theory and the symbolic model of procedural justice (PJ) climate, we conducted 2 independent studies—an experimental study focusing on the self‐perceived upward LMX comparison (i.e., an individual perceives that a coworker's LMX is higher than the LMX that he or she has with the supervisor; N = 203; Study 1: American working adults) and a field survey study focusing on the other‐perceived downward LMX comparison (i.e., a coworker perceives that his or her own LMX is higher than the LMX that the individual has with the supervisor; N = 177; Study 2: Chinese software engineers). Results from these studies consistently revealed that a coworker's higher LMX elicits an individual's hostile emotions when the PJ climate is low but that this relationship is buffered when the PJ climate is high. Results of both studies also showed that the coworker's higher LMX arouses the individual to direct harmful behavior toward that coworker (via the individual's feelings of hostility) when the PJ climate is low but not when it is high. 相似文献
999.
Albert P. Chan Wen-fang Song 《International journal of occupational safety and ergonomics》2018,24(1):73-81
Objective. The provision of appropriate personal cooling vests is recognized as an effective measure to combat heat stress. However, personal cooling vests are not widely implemented in the Hong Kong industries. The current study aims to evaluate the usability of a hybrid cooling vest that is associated with the success of its application in industrial settings. Methods. A self-administrated questionnaire focusing on 10 subjective attributes of cooling effect, ergonomic design and usability of a hybrid cooling vest was administered with 232 occupational workers in the construction, horticultural and cleaning, airport apron services and kitchen and catering industries. Results. A structural equation model estimated by analysis of moment structures was constructed to evaluate the usability of the cooling vest, as influenced by cooling effect and ergonomic design. Results showed that cooling effect (path coefficient?=?0.69, p?0.001) and ergonomic design (path coefficient?=?0.55, p?0.001) significantly affect the usability of the cooling vest. Conclusions. The structural equation model is feasible to examine the complex nature of the structural relationships among the subjective perceptions of personal cooling vests. The empirical findings furnish sound evidence for further optimization of the hybrid cooling vest in terms of cooling effect and ergonomic design for occupational workers. 相似文献
1000.
基于Landsat土地利用类型分类资料、夜间灯光影像资料、自动气象站资料以及大气边界层探测资料,划分出城市、郊区以及湖区代表站,分析了苏州2015年1月城市热岛日变化、昼夜差异特征以及城、湖温度差日变化特征,并对苏州城市热岛分布特征以及城、湖大气边界层结构差异进行分析。结果显示:(1)白天热岛强度小,09~17时热岛强度均小于1℃,最小值仅为02℃;夜间热岛强度大,19~05时热岛强度维持在12℃以上,最大值为17℃。(2)城、湖温差白天为正,夜间为负,市区变温速率比湖区快约02℃/h。(3) 苏州白天热中心形状不规则,范围大,城郊温差小,夜间形成单一封闭稳定热中心,热中心形状与市区有较好对应,城、郊温差维持在15℃左右。冬季地面盛行西北风,太湖湖陆风现象显著,湖陆风和盛行风向共同影响城市热羽向西南方向发展。(4)城、湖虚位温廓线在白天差异小,均有不稳定边界层形成,夜间市区仍维持不稳定边界层,而湖区有稳定边界层发展,近地层内干岛效应显著。(5)城市热岛影响范围有明显日变化特征,白天城市热岛影响范围小于40 m,夜间大于200 m。 相似文献