全文获取类型
收费全文 | 225篇 |
免费 | 2篇 |
国内免费 | 18篇 |
专业分类
安全科学 | 10篇 |
废物处理 | 37篇 |
环保管理 | 14篇 |
综合类 | 29篇 |
基础理论 | 42篇 |
污染及防治 | 69篇 |
评价与监测 | 29篇 |
社会与环境 | 15篇 |
出版年
2024年 | 1篇 |
2023年 | 8篇 |
2022年 | 23篇 |
2021年 | 22篇 |
2020年 | 2篇 |
2019年 | 7篇 |
2018年 | 11篇 |
2017年 | 17篇 |
2016年 | 16篇 |
2015年 | 16篇 |
2014年 | 8篇 |
2013年 | 29篇 |
2012年 | 21篇 |
2011年 | 22篇 |
2010年 | 11篇 |
2009年 | 7篇 |
2008年 | 3篇 |
2007年 | 5篇 |
2006年 | 3篇 |
2005年 | 3篇 |
2004年 | 5篇 |
2003年 | 1篇 |
1999年 | 1篇 |
1997年 | 1篇 |
1965年 | 1篇 |
1964年 | 1篇 |
排序方式: 共有245条查询结果,搜索用时 15 毫秒
181.
Ghufran Redzwan Maridah Mohd Amin Nur Nabiha Zulkarnain Mohd Radzi Abu Mansor Mohamad Suffian Mohamad Annuar Zul Ilham 《Journal of Material Cycles and Waste Management》2017,19(2):676-681
Biodiesel is commonly produced from vegetable oils, mostly edible and more expensive than petroleum diesel. By considering the cost of the conversion processes, cheap feedstock such as triglycerides and fatty acids (FA) extracted from early stage of food waste liquefaction has become a better choice than vegetable oils, as it could provide high yield of biodiesel without any compromise to food supply and other resources. In this study, FA from early stage of food waste liquefaction was extracted and tested for use as feedstock for biodiesel synthesis. The raw material was not pretreated but extraction was done by dry and wet methods. It was found that wet method could minimized the lost of short and medium-chained FA as well as reducing the number of steps required, thus, yielding higher amount of FA as feedstock. The effects of mixing, methanol ratio, reaction time and catalyst content were investigated for the acid-catalyzed esterification. The maximum biodiesel conversion obtained was 97.4 %. 相似文献
182.
Lichtfouse Eric Morin-Crini Nadia Fourmentin Marc Zemmouri Hassiba do Carmo Nascimento Inara Oliveira Queiroz Luciano Matos Tadza Mohd Yuhyi Mohd Picos-Corrales Lorenzo A. Pei Haiyan Wilson Lee D. Crini Grégorio 《Environmental Chemistry Letters》2019,17(4):1603-1621
Environmental Chemistry Letters - Coagulation/flocculation is a major phenomenon occurring during industrial and municipal water treatment to remove suspended particles. Common coagulants are metal... 相似文献
183.
Yadav S Irfan M Ahmad A Hayat S 《Journal of environmental biology / Academy of Environmental Biology, India》2011,32(5):667-685
Salinity in agricultutal terms is the excess of salts above the level plant require. Most often it poses constrains in the growth hence productivity of the category of plants called glycophytes, wherein falls major crops, therefore is a serious concern. It is often recognized as excess of sodium ions (sodicity) that imparts life threatening consequences in plant due to mal-textured soil hindered porosity and aeration leads to physiological water deficit. Mingling with other edaphic/environmental factors viz. precipitation, temperature, flooding, soil profile, water table exaggerates the catastrophe synergistically. Improper irrigations system, leaching fraction added with land clearing and deforestation have been marked as the major cause. The present review underlines the different sources of salinity stress and their physiological manifestations, toxicity responses alongwith tolerance in plants and management strategies in affected landscapes. 相似文献
184.
A comparison of radiometric correction techniques in the evaluation of the relationship between LST and NDVI in Landsat imagery 总被引:1,自引:0,他引:1
Atmospheric corrections for multi-temporal optical satellite images are necessary, especially in change detection analyses,
such as normalized difference vegetation index (NDVI) rationing. Abrupt change detection analysis using remote-sensing techniques
requires radiometric congruity and atmospheric correction to monitor terrestrial surfaces over time. Two atmospheric correction
methods were used for this study: relative radiometric normalization and the simplified method for atmospheric correction
(SMAC) in the solar spectrum. A multi-temporal data set consisting of two sets of Landsat images from the period between 1991
and 2002 of Penang Island, Malaysia, was used to compare NDVI maps, which were generated using the proposed atmospheric correction
methods. Land surface temperature (LST) was retrieved using ATCOR3_T in PCI Geomatica 10.1 image processing software. Linear
regression analysis was utilized to analyze the relationship between NDVI and LST. This study reveals that both of the proposed
atmospheric correction methods yielded high accuracy through examination of the linear correlation coefficients. To check
for the accuracy of the equation obtained through linear regression analysis for every single satellite image, 20 points were
randomly chosen. The results showed that the SMAC method yielded a constant value (in terms of error) to predict the NDVI
value from linear regression analysis-derived equation. The errors (average) from both proposed atmospheric correction methods
were less than 10%. 相似文献
185.
Idris SM Jones PL Salzman SA Croatto G Allinson G 《Environmental science and pollution research international》2012,19(8):3525-3537
Two emergent macrophytes, Arundo donax and Phragmites australis, were established in experimental horizontal subsurface flow (HSSF), gravel-based constructed wetlands (CWs) and challenged by treated dairy processing factory wastewater with a median electrical conductivity of 8.9 mS cm(-1). The hydraulic loading rate was tested at 3.75 cm day(-1). In general, the plants grew well during the 7-month study period, with no obvious signs of salt stress. The major water quality parameters monitored (biological oxygen demand (BOD), suspended solids (SS) and total nitrogen (TN) but not total phosphorus) were generally improved after the effluent had passed through the CWs. There was no significance different in removal efficiencies between the planted beds and unplanted gravel beds (p?>?0.007), nor was there any significant difference in removal efficiencies between the A. donax and P. australis beds for most parameters. BOD, SS and TN removal in the A. donax and P. australis CWs was 69, 95 and 26 % and 62, 97 and 26 %, respectively. Bacterial removal was observed but only to levels that would allow reuse of the effluent for use on non-food crops under Victorian state regulations. As expected, the A. donax CWs produced considerably more biomass (37?±?7.2 kg wet weight) than the P. australis CWs (11?±?1.4 kg wet weight). This standing crop equates to approximately 179 and 68 tonnes ha(-1) year(-1) biomass (dry weight) for A. donax and P. australis, respectively (assuming a 250-day growing season and single-cut harvest). The performance similarity of the A. donax and P. australis planted CWs indicates that either may be used in HSSF wetlands treating dairy factory wastewater, although the planting of A. donax provides additional opportunities for secondary income streams through utilisation of the biomass produced. 相似文献
186.
Removal of arsenic species from water by batch and column operations on bagasse fly ash 总被引:2,自引:0,他引:2
Imran Ali Zeid A. Al-Othman Abdulrahman Alwarthan Mohd Asim Tabrez A. Khan 《Environmental science and pollution research international》2014,21(5):3218-3229
Bagasse fly ash (BFA, a sugar industrial waste) was used as low-cost adsorbent for the uptake of arsenate and arsenite species from water. The optimum conditions for the removal of both species of arsenic were as follows: pH 7.0, concentration 50.0 μg/L, contact time 50.0 min, adsorbent dose 3.0 g/L, and temperature 20.0 °C, with 95.0 and 89.5 % removal of arsenate and arsenite, respectively. The Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich adsorption isotherms were used to analyze the results. The results of these models indicated single-layer uniform adsorption on heterogeneous surface. Thermodynamic parameters, i.e., ΔG°, ΔH°, and ΔS°, were also calculated. At 20.0 to 30.0 °C, the values of ΔG° lie in the range of ?4,722.75 to ?4,878.82 and ?4,308.80 to ?4,451.73 while the values of ΔH° and ΔS° were ?149.90 and ?121.07, and 15.61 and 14.29 for arsenate and arsenite, respectively, indicating that adsorption is spontaneous and exothermic. Pseudo-first-order kinetics was followed. In column experiments, the adsorption decreased as the flow rate increased with the maximum removal of 98.9 and 95.6 % for arsenate and arsenite, respectively. The bed depth service time and Yoon and Nelson models were used to analyze the experimental data. The adsorption capacity (N o) of BFA on column was 3.65 and 2.98 mg/cm3 for arsenate and arsenite, respectively. The developed system for the removal of arsenate and arsenite species is economic, rapid, and capable of working under natural conditions. It may be used for the removal of arsenic species from any contaminated water resources. 相似文献
187.
Distribution of Chironomidae (Insecta: Diptera) in polluted rivers of the Juru
River Basin, Penang, Malaysia 总被引:1,自引:0,他引:1
Salman A. Al-Shami Che Salmah Md Rawi Abu HassanAhm Siti Azizah Mohd Nor 《环境科学学报(英文版)》2010,22(11):1718-1727
The influence of physical and chemical parameters on the abundance and diversity of chironomids was studied in six rivers with
moderate to highly polluted water in the Juru River Basin. The rivers: Ceruk Tok Kun (CTKR) as reference site, and polluted rivers
of Pasir (PR), Juru (JR), Permatang Rawa (PRR), Ara (AR) and Kilang Ubi (KUR) were sampled over a period of five months
(November 2007–March 2008). Nine chirnomid species: Chironimus kiiensis, C. javanus, Polypedilum trigonus, Microchironomus sp.,
Dicrotendipes sp., Tanytarsus formosanus, Clinotanypus sp., Tanypus punctipennis and Fittkauimyia sp. were identified. Assessment
of their relationships with several environmental parameters was performed using the canonical correspondence analysis (CCA).
Tanytarsus formosanus was the most dominant in the relatively clean CTKR and moderately polluted JR with mean densities of
19.66 and 25.32 m?2, respectively while C. kiiensis was abundant in more polluted rivers. Tanytarsus formosanus, Dicrotendipes sp.
and Microchironomus sp. were grouped under moderate to high water temperature, total organic matter (TOM), total suspended solids
(TSS), velocity, pH, phosphates and sulphates. However, Tanypus punctipennis, Fittkauimyia sp., and Clinotanypus sp. were associated
with high contents of river sediment such as TOM, Zn and Mn and water ammonium-N and nitrate-N and they were associated with
higher dissolved oxygen (DO) content in the water. Chironomus kiiensis, C. javanus and P. trigonus showed positive relationships with
TOM, ammonium-N and nitrate-N as well as trace metals of Zn, Cu and Mn. These three species could be considered as tolerant species
since they have the ability to survive in extreme environmental conditions with low DO and high concentrations of pollutants. Based on
the water parameter scores in all rivers, the highest diversity of chironomid larvae was reported in CTKR. With higher concentrations
of organic and/or inorganic pollutants as reported in PPR, KUR and AR, the chironomid larval diversity decreased, and the abundance
of tolerant species, mainly Chironomus spp., increased. 相似文献
188.
Kamaludin Roziana Othman Mohd Hafiz Dzarfan Kadir Siti Hamimah Sheikh Abdul Khan Jesmine Ismail Ahmad Fauzi Rahman Mukhlis A. Jaafar Juhana 《Environmental science and pollution research international》2023,30(1):259-273
Environmental Science and Pollution Research - Various treatments of choice are available to overcome contamination of bisphenol A (BPA) in the environment including membrane technologies; however,... 相似文献
189.
M. Z. Ahmad Thirmizir Z. A. Mohd Ishak R. Mat Taib S. Rahim S. Mohamad Jani 《Journal of Polymers and the Environment》2011,19(1):263-273
Natural weathering was performed on poly(butylene succinate) (PBS) and its kenaf bast fibre (KBF) filled composites by exposing
the specimens to a tropical climate for a period of 6 months (max–min temperature: 31.5–23.9 °C; relative humidity: 78.9%).
The aim of this study was to investigate the effects of KBF loading and the addition of maleated PBS compatibiliser (PBSgMA)
on the performance of the composites under natural weathering. As expected, the flexural properties of both the uncompatibilised
and compatibilised composites dropped with increasing exposure time. The weathered specimens were also assessed by colour
change analysis, FTIR spectroscopy analysis and SEM examination. The total colour change, ΔE
ab
, of both the uncompatibilised and compatibilised composites increased with weathering time. FTIR spectroscopy analysis confirmed
the presence of oxidation products such as hydroxyl, carbonyl and vinyl species in the weathered uncompatibilised and compatibilised
composites. SEM examination revealed the presence of surface defects such as cracking, tiny holes and degraded fibre, which
explain the poor performance of the composites upon weathering. 相似文献
190.
Hossain MS Santhanam A Nik Norulaini NA Omar AK 《Waste management (New York, N.Y.)》2011,31(4):754-766
The management of clinical solid waste (CSW) continues to be a major challenge, particularly, in most healthcare facilities of the developing world. Poor conduct and inappropriate disposal methods exercised during handling and disposal of CSW is increasing significant health hazards and environmental pollution due to the infectious nature of the waste. This article summarises a literature review into existing CSW management practices in the healthcare centers. The information gathered in this paper has been derived from the desk study of open literature survey. Numerous researches have been conducted on the management of CSW. Although, significant steps have been taken on matters related to safe handling and disposal of the clinical waste, but improper management practice is evident from the point of initial collection to the final disposal. In most cases, the main reasons of the mismanagement of CSW are the lack of appropriate legislation, lack of specialized clinical staffs, lack of awareness and effective control. Furthermore, most of the healthcare centers of the developing world have faced financial difficulties and therefore looking for cost effective disposal methods of clinical waste. This paper emphasizes to continue the recycle-reuse program of CSW materials after sterilization by using supercritical fluid carbon dioxide (SF-CO2) sterilization technology at the point of initial collection. Emphasis is on the priority to inactivate the infectious micro-organisms in CSW. In that case, waste would not pose any threat to healthcare workers. The recycling-reuse program would be carried out successfully with the non-specialized clinical staffs. Therefore, the adoption of SF-CO2 sterilization technology in management of clinical solid waste can reduce exposure to infectious waste, decrease labor, lower costs, and yield better compliance with regulatory. Thus healthcare facilities can both save money and provide a safe environment for patients, healthcare staffs and clinical staffs. 相似文献