全文获取类型
收费全文 | 2135篇 |
免费 | 128篇 |
国内免费 | 753篇 |
专业分类
安全科学 | 174篇 |
废物处理 | 134篇 |
环保管理 | 197篇 |
综合类 | 1228篇 |
基础理论 | 341篇 |
污染及防治 | 696篇 |
评价与监测 | 115篇 |
社会与环境 | 69篇 |
灾害及防治 | 62篇 |
出版年
2024年 | 1篇 |
2023年 | 36篇 |
2022年 | 138篇 |
2021年 | 144篇 |
2020年 | 81篇 |
2019年 | 62篇 |
2018年 | 87篇 |
2017年 | 126篇 |
2016年 | 101篇 |
2015年 | 137篇 |
2014年 | 179篇 |
2013年 | 244篇 |
2012年 | 196篇 |
2011年 | 186篇 |
2010年 | 139篇 |
2009年 | 136篇 |
2008年 | 162篇 |
2007年 | 120篇 |
2006年 | 143篇 |
2005年 | 94篇 |
2004年 | 59篇 |
2003年 | 45篇 |
2002年 | 45篇 |
2001年 | 37篇 |
2000年 | 50篇 |
1999年 | 52篇 |
1998年 | 49篇 |
1997年 | 42篇 |
1996年 | 37篇 |
1995年 | 22篇 |
1994年 | 18篇 |
1993年 | 11篇 |
1992年 | 8篇 |
1991年 | 8篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有3016条查询结果,搜索用时 296 毫秒
141.
Song Yao Wang Liancheng Lv Baoliang Chang Guozhang Jiao Weizhou Liu Youzhi 《Environmental science and pollution research international》2020,27(7):7015-7024
Environmental Science and Pollution Research - In this study, porous activated carbon balls supported by nanoscale zero-valent iron composites (Fe@PACB-700) were used for the first time for the... 相似文献
142.
The moisture from skin sweat and atmospheric water affects the thermal protective performance provided by multilayer protective clothing. Four levels of moisture content were selected to evaluate the impact of moisture on thermal protection under dry (thermal radiation) and wet (thermal radiation and low-pressure steam) heat exposure. Also, the role of moisture and its relationship with exposure time were analyzed based on skin heat flux and Henriques integral value. The addition of moisture to a fabric system was found to result in differences in second-degree and third-degree skin burn times. When moisture is added to a fabric system, it both acts as a thermal conductor to present a negative effect and provides a positive effect owing to thermal storage of water and evaporative heat loss. The positive or negative effects of moisture are mainly dependent on the thermal exposure time, the moisture content and the presence of hot steam. 相似文献
143.
利用TSI公司的APS和SMPS系统,于2017年4月在江苏省环境监测中心点位连续一个月进行大气颗粒物数谱观测,结果表明,南京市春季典型月份大气颗粒物数浓度和体积浓度均值分别为1.64×104cm~(-3)和1.65×106μm~3/m~3;核模态、爱根核膜态、积聚模态和粗粒子模态数浓度占比分别为22.72%,53.52%,23.72%和0.05%,体积浓度占比分别为0.01%,1.76%,55.82%和42.41%;颗粒物数浓度平均日变化呈现双峰结构;PM_(2.5)体积浓度和质量浓度具有高度相关性;存在明显的新生粒子事件,3~10 nm颗粒物数浓度小时均值短时7 500 cm~(-3)。 相似文献
144.
Tanapon Phenrat Quoc Tran Ba Kitsanateen Piaowan Thippawan Thongboot Song Thao Le Thanisorn Sawasdee 《Environmental Forensics》2018,19(1):66-78
In Vietnam, Nicotex's site is perhaps the most infamous case of illegal disposal of toxic pesticides near residential areas. In 2013, affected villagers discovered illegal burials of around 1,000 tons of expired pesticides in the Nicotex factory. Organic pesticides were detected in illegal burial areas (IBAs) around 60 times greater than acceptable levels, but no attention was paid to contamination of metals, metalloids, and other classes of organic contaminants, which could be co-contaminants in pesticide formulation. This study assessed the contaminants remaining in the IBAs and surrounding residential areas two years after the source removal conducted in 2014. Additionally, a preliminary health risk assessment from residual contaminants was performed. Nine classes of chemicals including parental pesticides, inorganic and organic degradation byproducts, and metals and metalloids, comprising 123 chemicals were quantified in soil, sediment, and water samples from Nicotex and surrounding residential areas. Although concentrations of organic pesticides were below acceptable levels, arsenic contamination in the soil in a Nicotex IBA named NCT5 and Nap village (NV) exceeded the acceptable level. The enrichment factor and log-probability plot indicate that arsenic enrichment at NV is not from natural sources but is associated with arsenic contamination in NCT5. Arsenic may be a co-contaminant in pesticide manufacturing or an arsenical pesticide, such as monosodium methanearsonate. Arsenic found in NV was toxic arsenate for which the preliminary risk assessment yielded an unacceptable excess carcinogenic risk (1 × 10?4). While all attention was paid to investigate and treat contamination of organic pesticides, it turns out that arsenic is the major existing threat which poses an unacceptable cancer risk in good agreement with the high cancer rate claimed by villagers near Nicotex. This justifies the need for further investigation of the extent of the arsenic contamination and restoration of the contaminated land. 相似文献
145.
Fangli Su Tieliang Wang Haozhen Zhang Zhi Song Xue Feng Kan Zhang 《Environmental monitoring and assessment》2018,190(6):365
The aims of the present investigation were to reveal the distribution and enrichment characteristics of copper in soil and Phragmites australis of Liao River estuary wetland. The concentrations of copper in root, stem, leaf, and ear of Phragmites australis as well as in soil were determined to study the absorption capacity of copper by wild Phragmites australis of Liao River estuary wetland. The study was carried out at test pool of the Shenyang Agricultural University, and the experimental materials (soil, irrigating water and Phragmites australis) were derived from Liao River estuary wetland. The concentrations of copper in soil and Phragmites australis were 16.4441 to 49.0209 mg/kg and 0.8621 to 89.5524 mg/kg, respectively. The results indicated that the enrichment coefficients of copper in different tissues of Phragmites australis changed with the growth of Phragmites australis. The results revealed that the enrichment coefficients of copper in the whole Phragmites australis were greater than 1 at each growing stage of the Phragmites australis. The results also showed that the transfer coefficients of Phragmites australis to copper changed with the growth of Phragmites australis. The results revealed that the Phragmites australis had a good removal effect on copper from soil and had some characteristics of copper hyperaccumulator. 相似文献
146.
浅谈大学生社会实践活动的项目化管理 总被引:5,自引:0,他引:5
结合中国环境管理干部学院"千名学生绿色行"活动的项目化管理的具体组织和实践情况,在实际工作中探索大学生社会实践活动项目化管理的科学性和有效性,将项目化管理模式应用于大学生实践活动的管理中,最大限度地利用现有的学生活动资源、规范管理行为、降低管理成本、提高工作效率,实现培养大学生综合素质和创新能力的目的。 相似文献
147.
秦皇岛市天然矿泉水水质特征及开发利用前景研究 总被引:2,自引:0,他引:2
秦皇岛市天然矿泉水主要赋存在早太古代的花岗岩和变质岩的构造裂隙与风化裂隙之中,有锶、偏硅酸、锶及偏硅酸、锶溴及偏硅酸等4种类型。矿泉水水源地数量较多,水质优良,但开采程度较低,开发利用前景广阔。 相似文献
148.
149.
Mark Hixson Abdullah Mahmud Jianlin Hu Song Bai Debbie A. Niemeier Susan L. Handy Shengyi Gao Jay R. Lund Dana Coe Sullivan Michael J. Kleeman 《Atmospheric environment (Oxford, England : 1994)》2010,44(4):552-562
Future air pollution emissions in the year 2030 were estimated for the San Joaquin Valley (SJV) in central California using a combined system of land use, mobile, off-road, stationary, area, and biogenic emissions models. Four scenarios were developed that use different assumptions about the density of development and level of investment in transportation infrastructure to accommodate the expected doubling of the SJV population in the next 20 years. Scenario 1 reflects current land-use patterns and infrastructure while scenario 2 encouraged compact urban footprints including redevelopment of existing urban centers and investments in transit. Scenario 3 allowed sprawling development in the SJV with reduced population density in existing urban centers and construction of all planned freeways. Scenario 4 followed currently adopted land use and transportation plans for the SJV. The air quality resulting from these urban development scenarios was evaluated using meteorology from a winter stagnation event that occurred on December 15th, 2000 to January 7th 2001. Predicted base-case PM2.5 mass concentrations within the region exceeded 35 μg m?3 over the 22-day episode. Compact growth reduced the PM2.5 concentrations by ~1 μg m?3 relative to the base-case over most of the SJV with the exception of increases (~1 μg m?3) in urban centers driven by increased concentrations of elemental carbon (EC) and organic carbon (OC). Low-density development increased the PM2.5 concentrations by 1–4 μg m?3 over most of the region, with decreases (0.5–2 μg m?3) around urban areas. Population-weighted average PM2.5 concentrations were very similar for all development scenarios ranging between 16 and 17.4 μg m?3. Exposure to primary PM components such as EC and OC increased 10–15% for high density development scenarios and decreased by 11–19% for low-density scenarios. Patterns for secondary PM components such as nitrate and ammonium ion were almost exactly reversed, with a 10% increase under low-density development and a 5% decrease under high density development. The increased human exposure to primary pollutants such as EC and OC could be predicted using a simplified analysis of population-weighted primary emissions. Regional planning agencies should develop thresholds of population-weighted primary emissions exposure to guide the development of growth plans. This metric will allow them to actively reduce the potential negative impacts of compact growth while preserving the benefits. 相似文献
150.
Yun Kong Pei Zou Lihong Miao Jiaoqin Qi Liming Song Liang Zhu Xiangyang Xu 《Environmental science and pollution research international》2014,21(9):5983-5990
Bioremediation using isolated anti-cyanobacterial microorganism has been widely applied in harmful algal blooms (HABs) control. In order to improve the secretion of activated anti-cyanobacterial substances, and lower the cost, a sequential optimization of the culture medium based on statistical design was employed for enhancing the anti-cyanobacterial substances production and chlorophyll a (Chl a) removal by Streptomyces sp. HJC-D1 in the paper. Sucrose and KNO3 were selected as the most suitable carbon and nitrogen sources based on the one-at-a-time strategy method, and sucrose, KNO3 and initial pH were found as major factors that affected the anti-cyanobacterial ability of the isolated stain via the Plackett–Burman design. Based on the response surface and canonical analysis, the optimum condition of culture medium was obtained at 22.73 g l-1 of sucrose, 0.96 g l-1 of KNO3, and initial pH 8.82, and the Chl a removal efficiency by strain HJC-D1 increased from 63?±?2 % to 78?±?2 % on the optimum conditions. 相似文献