全文获取类型
收费全文 | 494篇 |
免费 | 41篇 |
国内免费 | 203篇 |
专业分类
安全科学 | 39篇 |
废物处理 | 41篇 |
环保管理 | 38篇 |
综合类 | 289篇 |
基础理论 | 102篇 |
污染及防治 | 163篇 |
评价与监测 | 23篇 |
社会与环境 | 20篇 |
灾害及防治 | 23篇 |
出版年
2024年 | 2篇 |
2023年 | 11篇 |
2022年 | 40篇 |
2021年 | 25篇 |
2020年 | 40篇 |
2019年 | 28篇 |
2018年 | 30篇 |
2017年 | 24篇 |
2016年 | 32篇 |
2015年 | 36篇 |
2014年 | 54篇 |
2013年 | 51篇 |
2012年 | 32篇 |
2011年 | 53篇 |
2010年 | 33篇 |
2009年 | 34篇 |
2008年 | 28篇 |
2007年 | 25篇 |
2006年 | 32篇 |
2005年 | 26篇 |
2004年 | 10篇 |
2003年 | 13篇 |
2002年 | 10篇 |
2001年 | 8篇 |
2000年 | 10篇 |
1999年 | 8篇 |
1998年 | 5篇 |
1997年 | 10篇 |
1996年 | 8篇 |
1995年 | 4篇 |
1994年 | 5篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1988年 | 2篇 |
排序方式: 共有738条查询结果,搜索用时 921 毫秒
331.
Geng Mingming Niu Yandong Liao Xiaohong Wang Kelin Yang Nan Qian Zhan Li Feng Zou Yeai Chen Xinsheng Deng Zhengmiao Xie Yonghong 《Environmental science and pollution research international》2022,29(10):14083-14097
Environmental Science and Pollution Research - The hydrological conditions of river-connected lakes are complex primarily owing to their considerable water-level fluctuations (WLFs). Water quality... 相似文献
332.
Zhao Chen Pu Wenyuan Niu Mengyuan Wazir Junaid Song Shiyu Wei Lulu Li Li Su Zhonglan Wang Hongwei 《Environmental science and pollution research international》2022,29(10):13983-13997
Environmental Science and Pollution Research - Exposure to airborne urban particles is a contributing factor for the development of multiple types of respiratory diseases; its pathological role as... 相似文献
333.
Dechlorane Plus(DP), a flame retardant used as an alternative to decabromodiphenylether, has been frequently detected in organisms, indicating its bioaccumulation and biomagnification potential in aquatic and terrestrial species. However, little data is available on the bioaccumulation of DP in amphibians. Dechlorane Plus and its analogs(DPs) were detected in the liver, muscle and brain tissues of wild frogs(Rana limnocharis), which were collected from an e-waste recycling site, Southeast China. DP, Mirex, Dec 602 and a dechlorinated compound of DP(anti-Cl11-DP) varied in the range of 2.01–291, 0.650–179, 0.260–12.4, and not detected(nd)–8.67 ng/g lipid weight, respectively. No difference of tissue distribution was found for syn-DP, Mirex and Dec 602 between the liver and muscle tissue(liver/muscle concentration ratio close to 1, p 0.05). However, higher retention was observed for anti-DP and anti-Cl11-DP in the frog muscle relative to the liver tissue(liver/muscle concentration ratio 1, p 0.05). Additionally, the blood-brain barrier was found to work efficiently to suppress these compounds entering brain tissues in this species(liver/brain concentration ratio 1, p 0.05), and the molecular weight was a key factor impacting the extent of the blood-brain barrier. Compared to levels in the muscle and brain tissue, a preferential enrichment of syn-DP was observed in the liver tissue, suggesting the occurrence of stereo-selective bioaccumulation in the wild frog. 相似文献
334.
建立了用离子色谱法测定工业废水中丙酸的方法,结果表明,常规阴离子对本方法的测定没有干扰,校准曲线线性相关系数高,并且能在很大范围内呈现线性。运用该方法实测标样和水样,精密度和准确度都能满足需求,表明该方法测定结果可靠,具有一定的应用价值。对实际废水样品进行分析,丙酸的回收率分别为95.0%~103.8%。本方法分析速度快,所需样品量少,且无需要复杂的前处理,简便、灵敏、可靠。 相似文献
335.
高温堆肥对猪粪中四环素类抗生素及抗性基因的影响 总被引:6,自引:0,他引:6
为了研究高温堆肥对猪粪中抗生素及抗生素抗性基因的影响,对不同堆肥处理中的四环素类抗生素(四环素、土霉素、金霉素)及其抗性基因(tetA、tetC、tetG、tetM、tetQ、tetW)的动态变化进行了定量研究.结果表明:低剂量组(10 mg·kg~(-1))中四环素、土霉素、金霉素的去除率分别为91%、94%、92%,高剂量组(50 mg·kg-1)中四环素、土霉素、金霉素的去除率分别为60%、62%、71%.在堆肥过程中,抗生素处理组目标基因相对丰度高于对照组,而低剂量组目标基因相对丰度(tetW除外)又普遍高于高剂量组.经堆肥处理后,tetA的相对丰度增加,tetC、tetG、tetM、tetQ、tetW的相对丰度均下降.高温堆肥可以有效去除猪粪中一定浓度的四环素类抗生素,并对四环素类抗性基因也有一定的削减作用. 相似文献
336.
Is selenium deficiency really the cause of Keshan disease? 总被引:1,自引:0,他引:1
Keshan disease (KD) is a dilated cardiomyopathy closely related with a diet deficient in the mineral selenium. It is named for the northeastern Chinese county Keshan, where the disease prevalence is high because of selenium-deficient soil. KD is a gene–environment interaction disease. Here, we used stepwise multiple regression analysis to analyze the risk factors of the disease and the main clinical features in 71 KD patients and 290 controls. The variables analyzed included age, sex, family history of KD, blood selenium level, glutathione peroxidase-1 (GPx-1) activity, variance at codon198 in GPx-1 gene, residence in an endemic area, abnormal electrocardiography (ECG) findings, and cardiothoracic (CT) ratio. The main risk factors found were low GPx-1 activity, family history of KD and living in an endemic area. The main clinical features were increased cardiac load on ECG and increased CT ratio and Tei index. Public health and clinical prevention efforts could focus on increasing GPx-1 activity to address KD. Is selenium deficiency really the certain cause of KD? This is not at all a settled question. And further study is promptly required to investigate the etiology of KD. 相似文献
337.
Leyan Xiong Longzhen Zheng Jingpeng Xu Dan Zheng Junhua Li Xinjia Li Juan Sun Qiang Liu Liling Niu Shaoming Yang Jian Xia 《Environmental Chemistry Letters》2011,9(2):251-257
We report a facile approach for preparing mesoporous boron-doped TiO2 materials by combining the sol?Cgel process with the dehydration of glucose. Specifically a high surface carbon material was formed by dehydration of glucose, then used as template. This material and the TiO2 dry gel were calcinated to produce porous TiO2. The as-synthesized boron-doped TiO2 was in pure anatase crystallite phase with high surface area. X-ray photoelectron spectroscopy (XPS) results showed that boron was incorporated into the anatase TiO2 lattice to form TiO2?xBx. The absorption spectra of TiO2?xBx extended into the visible region to 460?nm. The TiO2?xBx exhibited much higher photocatalytic activity on phenol degradation than pure TiO2. It showed that the phenol degradation by-products of TiO2?xBx were different from that of pure TiO2. Mechanism of the photocatalytic degradation of phenol at TiO2?xBx was also proposed. 相似文献
338.
为了减少生产马铃薯淀粉所产生的废水造成的水体环境污染,加入絮凝剂聚合氯化铝进行预处理,同时采用UASB反应器和BCO反应器进行联合处理,最终废水中COD平均去除率可达92%以上。UASB-BCO工艺可以提高废水的可生化性,且增设絮凝沉淀工艺,运行成本仅增加0.36元/吨,还可以回收淀粉废水中的有用物质。因此,带絮凝沉淀的UASB-BCO工艺能稳定高效的处理马铃薯淀粉废水,可行性强。 相似文献
339.
The effect of cyanobacterial bloom decay on water quality and the complete degradation of cyanobacterial blooms in a short period were examined by an enclosure experiment in Gonghu Bay of Lake Taihu,China.Water quality parameters as well as taste and odor compounds during the breakdown of cyanobacterial blooms were measured.Results showed that the decay of cyanobacterial blooms caused anoxic water conditions,decreased pH,and increased nutrient loading to the lake water.The highest concentrations of dimethyl sulfide (DMS),dimethyl trisulfide (DMTS),and β-cyclocitral were observed in the anoxic water,at 62331.8,12413.3,and 1374.9 ng/L,respectively.2-Methylisoborneol was dominant during the live growth phase of cyanobacterial blooms,whereas DMS and DMTS were dominant during the decomposition phase.Dissolved oxygen,pH,and chlorophyll a were negatively correlated with DMS,DMTS,and β-cyclocitral,whereas total phosphorus,total nitrogen,and ammonium (NH4+-N) were positively correlated with DMS,DMTS,β-cyclocitral,and β-ionone.The experimental results suggested that preventing the anaerobic decomposition of cyanobacterial blooms is an important strategy against the recurrence of a malodor crisis in Lake Taihu. 相似文献
340.