全文获取类型
收费全文 | 619篇 |
免费 | 6篇 |
国内免费 | 25篇 |
专业分类
安全科学 | 26篇 |
废物处理 | 87篇 |
环保管理 | 57篇 |
综合类 | 81篇 |
基础理论 | 91篇 |
环境理论 | 1篇 |
污染及防治 | 226篇 |
评价与监测 | 58篇 |
社会与环境 | 19篇 |
灾害及防治 | 4篇 |
出版年
2023年 | 10篇 |
2022年 | 8篇 |
2021年 | 10篇 |
2020年 | 7篇 |
2019年 | 11篇 |
2018年 | 20篇 |
2017年 | 31篇 |
2016年 | 28篇 |
2015年 | 18篇 |
2014年 | 25篇 |
2013年 | 58篇 |
2012年 | 33篇 |
2011年 | 48篇 |
2010年 | 34篇 |
2009年 | 45篇 |
2008年 | 43篇 |
2007年 | 41篇 |
2006年 | 42篇 |
2005年 | 30篇 |
2004年 | 31篇 |
2003年 | 14篇 |
2002年 | 15篇 |
2001年 | 13篇 |
2000年 | 7篇 |
1999年 | 4篇 |
1998年 | 5篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 3篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1985年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1976年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有650条查询结果,搜索用时 78 毫秒
391.
Moonkyung Chung Min Woo Seo Kang Suk Kim Jun Boum Park 《Waste management & research》2006,24(3):250-259
Geosynthetic liner systems are generally installed in landfill sites to prevent toxic leachate from escaping into the adjoining environment by utilizing their impervious characteristics. Therefore, it is important to protect the geomembrane from being damaged or destroyed during all phases of landfilling, namely landfill construction, waste tipping and landfill closure. This paper presents firstly the observed performance of a geomembrane liner from a landfill site where the geomembrane liner was installed on the slopes of a Korean landfill; and secondly the results of an inclined board laboratory test. Two types of experiments were conducted to identify the protecting effect of the overlaying geosynthetic on the geomembrane liners. At a testing landfill site, the slope consisted of three different sub-inclines and two 2-m-wide intermediate levels. The sub-inclines were each 8 m in vertical height and their angle of inclination was 1: 1.5 (vertical: horizontal). The reported observations were made for a time period of approximately 1 year, until the landfill was filled with wastes to the top of the uppermost slope. In addition, inclined board laboratory tests were carried out. During the inclined board test, a base table is inclined slowly and steadily until the block located on the base table starts to slide, when the tension and displacements of two geosynthetics, namely the geomembrane liner and protecting geotextile, are measured. In conclusion, test results showed that the down-drag force generated by waste accumulation and sliding of upper material was to a large extent dissipated through the elongation of the protecting geosynthetic overlying the geomembrane and thus was not transferred to the geomembrane. Unless the protecting geosynthetic undergoes structural failure, this stress relaxation phenomenon continues to occur so that the magnitude of tensile force to be applied on the geomembrane remains marginal. 相似文献
392.
393.
394.
S. H. Park E. J. Kim T. H. Yun J. H. Lee C. K. Kim Y. H. Seo S. A. Oh S. S. Choi S. J. Cho M. S. Kim G. Y. Han M. Y. Kim H. S. Jeong D. S. Cheon H. S. Kim 《Food and environmental virology》2010,2(2):69-73
Waterborne outbreaks of enteric viruses are a major public health concern. The present study has been carried out to assess the presence of enteric viruses responsible for human acute gastroenteritis (AGE) in groundwater intended for drinking and produce washing. In total, 62 samples from groundwater for drinking and produce washing collected from Dec 2007 to Dec 2008 in Seoul were tested for enteric viruses using conventional RT–PCR, ELISA, and real-time RT–PCR. Our results showed that enteric viruses were detected in 7 (8.8%) groundwater samples. Rotaviruses were detected in 3 (4.8%) of the samples by ELISA; human adenoviruses were detected in 2 (3.2%) of the samples by ELISA; and nested RT–PCR detected noroviruses in 2 (3.2%) of the samples. In one of the groundwater sample, the norovirus RNA was detected by conventional RT–PCR which was confirmed positive by real-time RT–PCR. Additionally, real-time RT–PCR successfully detected norovirus RNA in five out of 62 water samples (8.1%). The data demonstrate that real-time RT–PCR will be useful as a rapid and sensitive method for detecting norovirus in water samples. Phylogenetic analysis revealed that the noroviruses detected in two of the groundwater samples belonged to GII-4. These studies can provide important information for the prevalence of enteric viruses in Korean groundwater. 相似文献
395.
A major obstacle that limits the productivity in machining operations is the presence of machine tool chatter. Machining is a dynamic process and chatter behavior depends upon a number of different aspects including spindle speeds, material properties, tool geometry, and even the location of tool respect to the rest of machine. Many of the traditional models used to predict chatter stability lobes assume that parameters such as natural frequency, stiffness, and cutting coefficients remain constant. In reality, these parameters vary and they affect the chatter stability. The uncertainty in these parameters can be taken into consideration by employing the robust stability theory into a two degree of freedom milling model. Utilizing the Edge theorem and the Zero Exclusion condition, a robust chatter stability model, based on the analytical chatter stability milling model, is developed. This improves the reliability compared to the projected pseudo single degree of freedom model. The method is verified experimentally for milling operations while considering a changing natural frequency and cutting coefficient. 相似文献
396.
397.
Cement was used to solidify/stabilize the abandoned mine tailings contaminated primarily with arsenic (up to 88 mg/kg) and lead (up to 35 mg/kg). Solidified/stabilized (s/s) forms with a range of cement contents, 5–30 wt%, were evaluated to determine the optimal binder content. Unconfined compression strength test (UCS), Korean standard leaching tests, toxicity characteristic leaching procedures (TCLP), and synthetic precipitation leaching procedure (SPLP) were used for physical and chemical characterization of the s/s forms. Addition of 5% cement was enough for the s/s forms to satisfy the UCS requirements (0.35 MPa). The addition of 7.5% cement remarkably reduced the leachability of arsenic in tailings. However, that of lead tends to increase slightly with increase of cement content due to its amphoteric nature. The discussions were made for determination of optimal binder content and for results from different evaluation procedures. 相似文献
398.
399.
Enormous amounts of oyster shell waste have been illegally disposed of at oyster farm sites along the southern coast of Korea. In this study to evaluate the possibility of recycling this waste for use as a construction material, the mechanical characteristics of pulverized oyster shell were investigated in terms of its potential utilization as a substitute for the aggregates used in mortar. The unconfined compressive strengths of various soil mortar specimens, with varying blending ratios of cement, water and oyster shell, were evaluated by performing unconfined compression tests, and the results were compared with the strengths of normal cement mortar made with sand. In addition, the effect of organic chemicals on the hardening of concrete was evaluated by preparing ethyl-benzene-mixed mortar specimens. The long-term strength improvement resulting from the addition of fly ash was also examined by performing unconfined compression tests on specimens with fly-ash content. There was no significant reduction in the compressive strength of the mortars containing small oyster shell particles instead of sand. From these test data, the possible application of oyster shells in construction materials could be verified, and the change in the strength parameters according to the presence of organic compounds was also evaluated. 相似文献
400.