全文获取类型
收费全文 | 840篇 |
免费 | 2篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 20篇 |
废物处理 | 53篇 |
环保管理 | 30篇 |
综合类 | 112篇 |
基础理论 | 168篇 |
环境理论 | 1篇 |
污染及防治 | 284篇 |
评价与监测 | 118篇 |
社会与环境 | 57篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 8篇 |
2022年 | 24篇 |
2021年 | 19篇 |
2020年 | 7篇 |
2019年 | 19篇 |
2018年 | 31篇 |
2017年 | 28篇 |
2016年 | 46篇 |
2015年 | 23篇 |
2014年 | 50篇 |
2013年 | 105篇 |
2012年 | 49篇 |
2011年 | 67篇 |
2010年 | 45篇 |
2009年 | 39篇 |
2008年 | 26篇 |
2007年 | 35篇 |
2006年 | 32篇 |
2005年 | 18篇 |
2004年 | 14篇 |
2003年 | 12篇 |
2002年 | 11篇 |
2001年 | 8篇 |
2000年 | 10篇 |
1997年 | 5篇 |
1995年 | 4篇 |
1994年 | 3篇 |
1992年 | 3篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1982年 | 4篇 |
1980年 | 2篇 |
1973年 | 2篇 |
1972年 | 3篇 |
1971年 | 2篇 |
1970年 | 7篇 |
1969年 | 3篇 |
1968年 | 2篇 |
1967年 | 4篇 |
1966年 | 3篇 |
1965年 | 2篇 |
1964年 | 2篇 |
1961年 | 2篇 |
1960年 | 5篇 |
1959年 | 7篇 |
1958年 | 12篇 |
1957年 | 5篇 |
1956年 | 7篇 |
排序方式: 共有844条查询结果,搜索用时 406 毫秒
361.
Radolić V Vuković B Smit G Stanić D Planinić J 《Journal of environmental radioactivity》2005,83(2):191-198
Radon concentrations in air and geothermal water of the spa pools in Croatia were measured and the average values of 40.3 and 4.5 kBq/m3 were obtained, respectively. Great difference between radon concentrations in pool and spring water was considered as a result of mixing normal and geothermal water in the pool as well as the radon decay. Estimation of an effective dose, received by the personnel in the Bizovac spa, gave the value of 0.27 mSv/y. At the location Stubica, the transfer factor of the radon for air and thermal water in the pool was calculated, and the value of 4.9+/-0.7 x 10(-3) was obtained. 相似文献
362.
363.
Estimation of total sediment load concentration obtained by experimental study using artificial neural networks 总被引:1,自引:0,他引:1
Estimation of sediment concentration in rivers is very important for water resources projects planning and managements. The
sediment concentration is generally determined from the direct measurement of sediment concentration of river or from sediment
transport equations. Direct measurement is very expensive and cannot be conducted for all river gauge stations. However, sediment
transport equations do not agree with each other and require many detailed data on the flow and sediment characteristics.
The main purpose of the study is to establish an effective model which includes nonlinear relations between dependent (total
sediment load concentration) and independent (bed slope, flow discharge, and sediment particle size) variables. In the present
study, by performing 60 experiments for various independent data, dependent variables were obtained, because of the complexity
of the phenomena, as a soft computing method artificial neural networks (ANNs) which is the powerful tool for input–output
mapping is used. However, ANN model was compared with total sediment transport equations. The results show that ANN model
is found to be significantly superior to total sediment transport equations. 相似文献
364.
365.
The transverse electrical resistance and DC potentials of the electric fishTorpedo marmorata have been measured. The resistance is lower in the skin covering the electric organ than in skin taken from other parts of the body. The external skin surface is electropositive relative to the internal one. On the basis of the results obtained it is probable that electrical discharges are channelled from the body through low resistant pathways; the skin covering the electric organ does not seem to play any specific role in ionic transport occurring in connection with, or as a consequence of, electrical discharges of the fish. 相似文献
366.
Iztok Arčon Arnold Pastrello Laura Catalano Maria De Nobili Pierpaolo Cantone Liviana Leita 《Environmental Chemistry Letters》2006,4(4):191-194
The fate of cyanides in soil is strongly influenced by the formation of Fe cyanides, which can interact with organic and inorganic colloids and precipitate as stable compounds. Scarce information is available on the capacity of humic acids to interact with cyano-complexes and thus affect the leaching and prevent the risk of contamination of watertable. Here we show that interaction between humic acids (HAs) and ferricyanide complex led to a formation of ferricyanide-humo micelles, and that the interaction did not imply changes in the original structure of ferricyanide complex. 相似文献
367.
Concentration of Cd, Co, Cr, Ni, Zn, Fe, Mn, Pb and Cu were determinedin biota and sediment samples collected from the Marmara Sea in Turkey. The levels of Zn, Fe, Mn, Pb and Cu in the macroalgae are higher than previous studies in the Marmara Sea. Moreover, Cu and Zn concentrations at the present study are significantly high than Bosphorus and Black Sea algae. The order heavy metal concentrations in the mussel samples was: Fe > Zn > Ni > Mn > Cu > Pb > Cr > Cd > Co. The metal concentrations are generally lower when compared with the Black Sea mussels except Pb. At the same time, concentrations of Pb, Cu and Zn in the mussel species are lower when compared with the results in the Aegean Sea. The ranges of Mn and Cu in the tested fish samples are higher than Black Sea fish. On the other hand, Cd, Co, Cr, Zn and Pb concentrations are lower. The northern coast of the Marmara Sea having the highest metal concentrations in sediments as follows: Co, Cr, Ni, Fe at ?arköy ; Pb, Cu at M. Ere?li; Cd, Zn, Mn at Menek?e. The heavy metal levels in the sediment samples are lower than other areas in the Marmara Sea. 相似文献
368.
Nali C Ferretti M Pellegrin i M Lorenzini G 《Environmental monitoring and assessment》2001,69(2):159-174
An ambient air study was conducted inthe city of Florence, Italy, in the summer 1996.Tropospheric ozone was continuously monitored withautomatic analyzers in three stations, two located inthe urban area and one in the hilly surroundings(Settignano). A biomonitoring campaign based on thetobacco cv. Bel-W3 plants was performed in the samearea. The highest values were constantly recorded inthe Settignano station. The highest 1-hour meanrecorded was 197 nl/l; the accumulated exposure overa threshold of 40 nl/l (AOT40) was well above thecritical levels standards for protection of thevegetation. A consistent temporal variation wasobserved and July proved to be the month with thehighest ozone levels. Cumulative frequencydistribution of ozone maximum daily concentrationsexhibited a good fitting to log-normality. No`week-end effect was observed. Biomonitoring datawere in good agreement with chemico-physical ones. 相似文献
369.
Iva Japundžić Liborija Lugović-Mihić 《International journal of occupational safety and ergonomics》2019,25(3):423-428
Purpose. To determine the prevalence of undesirable skin reactions to latex in dental professionals and students of the School of Dental Medicine in Zagreb, Croatia. Methods. Our research included 444 participants, of which 200 agreed to undergo a skin prick test (SPT). All participants answered a questionnaire in which we asked about incidence of skin lesions, duration of occupational exposure to latex, localization of skin lesions and symptoms. Statistical analysis of the questionnaire and test results was then carried out. Results. Of the total 444 participants surveyed, 249 (56.1%) reported lesions on their skin (professionals 64.8%, students 6.1–58.5%). From the questionnaire, 239 (96.0%) respondents reported lesions on the hands and fingers, mostly in the form of erythema (37.0%) and occasional dryness of skin (29.0%). Positive SPT results were found in 14 (7.0%) out of the 200 respondents who underwent the test. Conclusions. While a large number of subjects (56.1%) reported skin lesions when using latex products at their workplace, the SPT test was positive only in 7.0%. The results show that the prevalence of self-reported skin lesions was significantly related to the length of occupational exposure, with a substantial effect size (p?<?0.001; V?=?0.334). 相似文献
370.
Švec Roman Martinát Stanislav Pícha Kamil Klusáček Petr Knotek Jaroslav Schaefer Justin Calvin Březinová Monika Navrátil Josef 《Environment, Development and Sustainability》2021,23(10):15074-15099
Environment, Development and Sustainability - Our aim is to determine the factors influencing a visitor’s decision to stay in a green accommodation facility. Visitors from six tourist sites... 相似文献