全文获取类型
收费全文 | 33466篇 |
免费 | 1038篇 |
国内免费 | 5571篇 |
专业分类
安全科学 | 1692篇 |
废物处理 | 1649篇 |
环保管理 | 3745篇 |
综合类 | 11970篇 |
基础理论 | 7782篇 |
环境理论 | 4篇 |
污染及防治 | 9172篇 |
评价与监测 | 1784篇 |
社会与环境 | 1499篇 |
灾害及防治 | 778篇 |
出版年
2023年 | 310篇 |
2022年 | 884篇 |
2021年 | 837篇 |
2020年 | 670篇 |
2019年 | 639篇 |
2018年 | 881篇 |
2017年 | 969篇 |
2016年 | 1102篇 |
2015年 | 1140篇 |
2014年 | 1633篇 |
2013年 | 2867篇 |
2012年 | 1925篇 |
2011年 | 2060篇 |
2010年 | 1694篇 |
2009年 | 1659篇 |
2008年 | 1911篇 |
2007年 | 1703篇 |
2006年 | 1675篇 |
2005年 | 1463篇 |
2004年 | 1477篇 |
2003年 | 1387篇 |
2002年 | 977篇 |
2001年 | 1053篇 |
2000年 | 906篇 |
1999年 | 660篇 |
1998年 | 543篇 |
1997年 | 548篇 |
1996年 | 512篇 |
1995年 | 469篇 |
1994年 | 442篇 |
1993年 | 357篇 |
1992年 | 376篇 |
1991年 | 295篇 |
1990年 | 322篇 |
1989年 | 264篇 |
1988年 | 222篇 |
1987年 | 194篇 |
1986年 | 173篇 |
1985年 | 176篇 |
1984年 | 199篇 |
1983年 | 188篇 |
1982年 | 198篇 |
1981年 | 187篇 |
1980年 | 137篇 |
1979年 | 154篇 |
1978年 | 131篇 |
1977年 | 117篇 |
1975年 | 118篇 |
1974年 | 115篇 |
1972年 | 133篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
961.
M. R. Theobald U. Dragosits C. J. Place J. U. Smith M. Sozanska L. Brown D. Scholefield A. Del Prado J. Webb P. G. Whitehead A. Angus I. D. Hodge D. Fowler M. A. Sutton 《Water, Air, & Soil Pollution: Focus》2004,4(6):135-142
The distribution and impacts of different nitrogen pollutants are inextricably linked. To understand the problem fully, the interactions between the different pollutants need to be taken into account. This is particularly important when it comes to abatement techniques, since measures to reduce emissions of one nitrogen pollutant can often lead to an increase in another. This project represents a step towards greater understanding of these issues by linking together new and existing nitrogen flux models into a larger framework. The modelling framework has been constructed and some of the nitrogen flows between fields, farms and the atmosphere have been modelled for a UK study area for typical farm management scenarios. 相似文献
962.
Ed Gidman Royston Goodacre Bridget Emmett Lucy J. Sheppard Ian D. Leith Dylan Gwynn-Jones 《Water, Air, & Soil Pollution: Focus》2004,4(6):251-258
The potential for metabolic fingerprinting via Fourier-transform infrared (FT-IR) spectroscopy to provide a novel approach for the detection of plant biochemical responses to N deposition is examined. An example of spectral analysis using shoot samples taken from an open top chamber (OTC) experiment simulating wet ammonium deposition is given. Sample preparation involved oven drying and homogenisation via mill grinding. Slurries of a consistent dilution were then prepared prior to FT-IR analysis. Spectra from control, 8 and 16 kg N ha–1 yr–1 treatments were then subjected to cross-validated discriminant function analysis. Ordination diagrams showed clear separation between the three N treatments examined. The potential for using Calluna vulgaris (L.) Hull as a bioindicator of N deposition is further evident from these results. The results also clearly demonstrate the power of FT-IR in discriminating between subtle phenotypic alterations in overall plant biochemistry as affected by ammonium pollution. 相似文献
963.
Water, Air, &; Soil Pollution: Focus - What should System Managers prefer? Systems that never fail or systems that remain safe during a failure? The present paper tries to give an answer to this... 相似文献
964.
In this investigation, all the techniques used in the chemical recycling of polyethylene terephthalate (PET) are critically reviewed according to the overall benefits together with the environmental surcharge that they cause. Those, which are consistent with the principles of sustainable development, are indicated. Experimental data are presented for the acid hydrolysis of PET and compared with previous results on the alkaline hydrolysis of PET with, or without, the use of a phase transfer catalyst. Overall material balances are carried out for the hydrolysis of PET. Finally, it can be postulated that recycling according to the scheme: is the only one within the framework of sustainable development. Therefore, the recycling of PET does not only serve as a partial solution to the solid waste problem but also contributes to the conservation of raw petrochemical products and energy. 相似文献
965.
Felipe Hernndez‐Luis Mercedes Lemus Domingo Grandoso Mario V. Vzquez Carmen D. Arbelo 《补救:环境净化治理成本、技术与工艺杂志》2004,14(3):105-112
This article presents the results of an experimental study conducted to evaluate the behavior of two types of andisol soils found in Tenerife, Canary Islands, Spain. The soils were evaluated in relation to their buffering capacity when confronted with acid and alkaline fronts generated during electroremediation treatment. The study was conducted using a cell, which established a continuous flow of distilled water through electrode chambers to remove H+ and OH? generated during electrolysis. The results indicate that the soils had sufficient buffer capacity to support variations in pH independent of the maintenance of flow of solution in the electrode chambers. Although the mechanism of migration was not affected, the flow of water favored the movement of ions by diffusion monitoring of the electrolytic current allowed for a real‐time parameter to act as an indicator of the quantity of ions available in regions near the electrodes. © 2004 Wiley Periodicals, Inc. 相似文献
966.
967.
辽河三角洲土壤中石油类含量光谱分析初探 总被引:2,自引:0,他引:2
石油类物质对土壤的污染在油田区域内是一个普遍存在的问题。全面了解土壤中石油类物质含量是评价土壤石油污染的前提条件。对土壤石油污染评价的传统方法是在野外实地进行大量土壤采样,然后在试验室内分析石油类物质的含量。文中提出了利用少量野外土壤石油类物质样品,并结合野外光谱测量的方法对土壤中石油类物质进行分析的新方法。该方法应用于辽河三角洲,具有快速、省钱、省时、省力的特点,能对土壤中石油类物质含量进行宏观分析。满足了油田开发对土壤及环境污染评价的需要,并能为制定油田开发管理保护对策提供辅助信息。 相似文献
968.
Kimberly D. Elsbach 《组织行为杂志》2004,25(1):99-128
Using qualitative methods, I examine how employees in corporate office environments interpreted a variety of relatively permanent office décor (e.g., furniture, photos, personal mementos) as indicators of their colleagues' workplace identities (i.e., central and enduring categorizations regarding employees' status and distinctiveness in the workplace). Similar to the encoding of behavioral cues of identity, findings suggest that interpretation of physical identity markers begins with either (1) a top‐down process of social categorization, in which specific rules are applied to encoding a few, focal, and visually salient pieces of office decor as evidence of management prototypes, or (2) a bottom‐up process of social categorization, in which a variety of physical artifacts are examined and compared to specific managerial exemplars to develop a complex representation of workplace identity. Findings also suggest that some of the unique attributes of physical identity markers (i.e., their potential to be viewed independently from their displayer, and their relative permanence) may be associated with the focus of each profiling process (i.e., on interpreting status vs. distinctiveness, and consistency vs. change). Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
969.
The influences of organizational citizenship behavior (OCB) and workplace deviant behavior (WDB) on business unit performance were investigated using data from branches of a fast food organization. Data included measures of WDB and OCB obtained from staff, ratings of performance provided by supervisors, and objective measures of performance. It was found that WDB was negatively and significantly associated with business unit performance measured both subjectively and objectively. OCB, however, failed to contribute to the prediction of business unit performance beyond the level that was achieved by WDB. It appeared, therefore, that the presence of deviant employees among business units impinges upon the performance of the business unit as a whole, whereas OCBs had comparatively little effect. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
970.
The present study examines the interaction effect of gender of both subordinates and supervisors on subordinates' perception of differentiation of boss–subordinate relationship in an African setting. Data was collected from a total of 60 boss–subordinate dyads in four‐sex combinations obtained through a survey of a large five‐star hotel in Abuja, Nigeria. Results revealed that subordinates in opposite‐sex dyads perceived better quality of exchange than those in same‐sex dyads. The strongest quality of exchange was perceived in male boss–female subordinate dyad, while the weakest was perceived in female boss–female subordinate dyad. This emphasizes the importance of gender in the differentiation of boss–subordinate relationships in an African setting. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献