全文获取类型
收费全文 | 807篇 |
免费 | 1篇 |
国内免费 | 30篇 |
专业分类
安全科学 | 15篇 |
废物处理 | 58篇 |
环保管理 | 63篇 |
综合类 | 90篇 |
基础理论 | 134篇 |
污染及防治 | 328篇 |
评价与监测 | 99篇 |
社会与环境 | 43篇 |
灾害及防治 | 8篇 |
出版年
2023年 | 53篇 |
2022年 | 113篇 |
2021年 | 95篇 |
2020年 | 29篇 |
2019年 | 32篇 |
2018年 | 38篇 |
2017年 | 36篇 |
2016年 | 50篇 |
2015年 | 20篇 |
2014年 | 39篇 |
2013年 | 77篇 |
2012年 | 24篇 |
2011年 | 29篇 |
2010年 | 26篇 |
2009年 | 12篇 |
2008年 | 24篇 |
2007年 | 24篇 |
2006年 | 18篇 |
2005年 | 14篇 |
2004年 | 13篇 |
2003年 | 7篇 |
2002年 | 6篇 |
2001年 | 4篇 |
2000年 | 9篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1984年 | 2篇 |
1983年 | 5篇 |
1982年 | 5篇 |
1981年 | 2篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 4篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1964年 | 2篇 |
排序方式: 共有838条查询结果,搜索用时 15 毫秒
611.
Md. Kawser Ahmed Elora Parvin Md. Monirul Islam Mosammat Salma Akter Shahneawz Khan Md. Habibullah Al-Mamun 《Chemistry and Ecology》2014,30(6):532-540
The objective of this study was to examine the toxicological effect of two major heavy metal pollutants, lead chloride (PbCl2) and cadmium chloride (CdCl2), in the freshwater climbing perch, Anabas testudineus. Fish were exposed to 1.0 and 2.0 mg/L both metals and histopathological changes in gill, kidney and liver tissues were studied. Major changes observed in gill tissue were epithelial lifting, proliferation of epithelial cells, fusion of secondary lamellae, hyperplasia and hypertrophy of mucous cells, and necrosis of epithelial cells. Cell necrosis, degenerated kidney tubules, congestion, lymphocytic infiltration and vacuolation were the major abnormalities observed in kidney tissue. The most conspicuous changes in liver were darker nucleoli, irregularly shaped hepatocytes with dilated blood capillaries, and focal as well as single necrosis. Fish specimens exposed to PbCl2 exhibited pronounced changes in all tissues examined compared with those exposed to CdCl2. It is evident from this study that heavy metals can cause significant histopathological changes in fish tissue. 相似文献
612.
The photocatalytic degradation of Procion blue H-B dye in biodegraded textile washwater has been investigated for the complete removal of color and maximum reduction of chemical oxygen demand (COD). Pseudomonas putida was utilized for obtaining biodegraded textile washwater. In this process, silver-doped TiO2 photocatalyst was prepared and experiments were carried out to study the effects of UV and mercury lamp irradiations on COD reduction and removal of color. The thus prepared silver-doped TiO2 catalyst was characterized by thermogravimetric and differential thermal analysis, UV-visible spectrometer, X-ray diffraction, scanning electron microscope, energy dispersive X-ray microanalysis, and BET surface area techniques. Adsorption studies were also carried out to evaluate the fitness of isotherm models. The results show that the silver-doped TiO2 has enhanced the photodegradation of Procion blue H-B dye under UV and mercury lamp irradiations. The enhanced activity of silver-doped TiO2 is due to the enrichment of electron–hole separation by electron trapping of silver particles. 相似文献
613.
Mushtaq Ahmed Nadia Latif Rahmat Ali Khan Akhlaq Ahmad Gustavo Thomé Maria R.C. Schetinger 《毒物与环境化学》2013,95(8):1659-1665
The venom of krait (Bungarus sindanus), an Elapidae snake, contains high level of acetylcholinesterase (AChE) activity. The effect of arachidonic acid on krait (Bungarus sindanus) venom AChE (acetylcholine hydrolase, EC 3.1.1.7) was studied using kinetic methods. This study evaluated for the first time whether arachidonic acid acts as potential AChE inhibitor of krait venom. Kinetic studies, using Line-Weaver Burk and Dixon plots, indicated that the inhibition produced by arachidonic acid was non-competitive, i.e., both km and V max fell with increase in the concentration of arachidonic acid. The concentration of arachidonic acid required to inhibit 50% of enzymatic activity was found to be 1.9?µM while the inhibitory constant (Ki ) was 1.4?µM. The present results suggest that essential fatty acid (arachidonic acid) may also be used as an inhibitor of snake venom AChE. 相似文献
614.
Chlorpyrifos is a common organophosphorus insecticide used for crop protection. Chlorpyrifos use has induced heath issues and water pollution. Such issues may be solved by phytoremediation, which is the use of plants for the cleanup of pollutants. Here, we tested Plantago major L. to clean water and soils under laboratory conditions. Results show that the concentration of chlorpyrifos residues after 5 days exposure reached 36.86 μg/g in roots and 13.93 μg/g in upper plant tissues. Gas chromatography–mass spectrometry (GC–MS) analysis of chlorpyrifos metabolites suggests the formation of 3, 5, 6-trichloro-2-pyridinol (TCP) and diethyl 3,5,6-trichloropyridin-2-yl phosphate (chlorpyrifos-oxon). Chlorpyrifos-oxon was detected in the roots and the leaves after 2 h of testing. After 24 h of testing, the degradation product chlorpyrifos-oxon increased in the roots and the leaves then decreased gradually until the end of testing. TCP levels increased gradually to 192 h then decreased until the end of testing. 相似文献
615.
Sharif Ahmed Mukul Mohammad Belal Uddin A.Z.M. Manzoor Rashid Jefferson Fox 《国际发展与全球生态学杂志》2013,20(2):180-188
Protected areas (PAs) represent a key global strategy in biodiversity conservation. In tropical developing countries, the management of PAs is a great challenge as many contain resources on which local communities rely. Collection and trading of non-timber forest products (NTFPs) is a well-established forest-based livelihood strategy, which has been promoted as a potential means for enhanced conservation and improved rural livelihoods in recent years, even though the sustainability or ecological implications have rarely been tested. We conducted an exploratory survey to understand the role and stakeholder views on conservation prospects and perceived ecological feasibility of NTFPs and harvesting schemes in a northeastern PA of Bangladesh, namely the Satchari National Park. Households (n?=?101) were interviewed from three different forest dependency categories, adopting a stratified random sampling approach and using a semi-structured questionnaire. The study identified 13 locally important NTFPs, with five being critically important to supporting local livelihoods. Our study suggests that collection, processing and trading in NTFPs constitutes the primary occupation for about 18% of local inhabitants and account for an estimated 19% of their cash annual income. The household consensus on issues relating to NTFPs and their prospective role in conservation was surprisingly high, with 48% of respondents believing that promotion of NTFPs in the PA could have positive conservation value. The majority (71%) of households also had some understanding of the ecological implications of NTFP harvesting, sustainability (53%) and possible management and monitoring regimes (100%). With little known about their real application in the field, our study suggests further investigations are required to understand the ecological compatibility of traditional NTFP harvesting patterns and management. 相似文献
616.
ABSTRACTThe main purpose of Green Supply Chain Management (GSCM) is to improve the quality of supply chain management strategies and environmental performance. As per current statistics, the chemical industry is growing fast in Bangladesh. In order to compete for global competition, GSCM is essential in this sector. This paper proposes a systematic approach of structural framework whose aim is to enhance the probability of constructive implementation of GSCM in the field chemical industry in Bangladesh. Therefore, this framework evaluates the appropriate interrelationship along with the drivers of GSCM in the chemical industry. In total, eight drivers were finalized from an associated literature review with the help of survey and by taking expert opinions via the Delphi methodology. In addition to MICMAC analysis, the driving and the dependence powers for all the drivers were determined. Moreover, the structural frameworks for the drivers were developed by means of total interpretive structural modeling (TISM) technique. As a result, the findings indicate that the most significant driver was supplier pressure and willingness and the most important barrier was high cost. Finally, the main objective of this research is expected to help industrial managers to evaluate and understand the critical areas where they should emphasize to implement GSCM in the chemical industry. 相似文献
617.
Farha Masood Fariha Hasan Safia Ahmed P. Chen Abdul Hameed 《Journal of Polymers and the Environment》2012,20(3):865-871
The biodegradable and biocompatible copolymer poly-(3-hydroxybutyrate-co-5 mol% 3-hydroxyvalerate), poly-(3HB-co-5 mol% 3HV), was synthesized by Bacillus cereus S10 and the highest yield was determined as 69.91 % at pH 7 and 30 °C after 48 h of incubation using a glucose as the sole carbon source. Poly-(3HB-co-5 mol% 3HV) was purified from bacterial biomass using chloroform. FTIR analysis showed absorption bands at 1,723, 1,274, 1,373, 1,453, 2,932 cm?1 corresponding to C=O, C–O stretching, CH3, –CH2 and –CH groups, respectively. 1H-NMR and 13C-NMR analysis confirmed that the copolymer was composed of 95 mol% of 3-hydroxybutrate and 5 mol% of 3-HV monomeric units. Poly-(3-HB-co-5 mol% 3HV) was used for nanoparticles preparation. The diameter of nanoparticles was 202 nm. 相似文献
618.
Ebaid Hossam Abd Rabou Abdel-Mageed Ahmed Al-Tamimi Jameel Homoud Hassan Iftekhar Rady Ahmed Mostafa El-Newehy Mohamed Hassan Mashaly Ashraf Mohamed Abdel-Megeed Ahmed AbdelFattah Mahmoud Alhazza Ibrahim Abdel-Halim Essam Sayed Salem Abdelfattah Zeidan Mohamed 《Environmental science and pollution research international》2020,27(32):40009-40019
Environmental Science and Pollution Research - Oil spills can result in significant damage to marine estuaries, rivers, lakes, wetlands, and shorelines. Electrospun nanofibers containing... 相似文献
619.
Asad Ali Farrah Zaidi Syeda Hira Fatima Muhammad Adnan Saleem Ullah 《Environmental monitoring and assessment》2018,190(4):245
In this study, we propose to develop a geostatistical computational framework to model the distribution of rat bite infestation of epidemic proportion in Peshawar valley, Pakistan. Two species Rattus norvegicus and Rattus rattus are suspected to spread the infestation. The framework combines strengths of maximum entropy algorithm and binomial kriging with logistic regression to spatially model the distribution of infestation and to determine the individual role of environmental predictors in modeling the distribution trends. Our results demonstrate the significance of a number of social and environmental factors in rat infestations such as (I) high human population density; (II) greater dispersal ability of rodents due to the availability of better connectivity routes such as roads, and (III) temperature and precipitation influencing rodent fecundity and life cycle. 相似文献
620.
Saleh Ahmed A. Ebeid Tarek A. Abudabos Alaeldein M. 《Environmental science and pollution research international》2018,25(15):14606-14613
Environmental Science and Pollution Research - This experiment was conducted to study that effect of a phytogenics (herbal mixture) supplementation as alternative to antibiotics on the growth... 相似文献