全文获取类型
收费全文 | 621篇 |
免费 | 41篇 |
国内免费 | 71篇 |
专业分类
安全科学 | 104篇 |
废物处理 | 5篇 |
环保管理 | 94篇 |
综合类 | 346篇 |
基础理论 | 65篇 |
污染及防治 | 32篇 |
评价与监测 | 22篇 |
社会与环境 | 43篇 |
灾害及防治 | 22篇 |
出版年
2024年 | 3篇 |
2023年 | 3篇 |
2022年 | 8篇 |
2021年 | 11篇 |
2020年 | 13篇 |
2019年 | 10篇 |
2018年 | 7篇 |
2017年 | 16篇 |
2016年 | 22篇 |
2015年 | 22篇 |
2014年 | 19篇 |
2013年 | 31篇 |
2012年 | 51篇 |
2011年 | 60篇 |
2010年 | 46篇 |
2009年 | 40篇 |
2008年 | 37篇 |
2007年 | 49篇 |
2006年 | 41篇 |
2005年 | 41篇 |
2004年 | 35篇 |
2003年 | 21篇 |
2002年 | 31篇 |
2001年 | 31篇 |
2000年 | 18篇 |
1999年 | 11篇 |
1998年 | 10篇 |
1997年 | 6篇 |
1996年 | 4篇 |
1995年 | 10篇 |
1994年 | 5篇 |
1993年 | 6篇 |
1992年 | 6篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1983年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有733条查询结果,搜索用时 234 毫秒
131.
中国黄土高原的形成过程与整治研究 总被引:5,自引:0,他引:5
从黄土高原的形成过程,黄土-古土壤性征的对比,孢粉、石器、历史、地理以及水土流失的定位观测资料,说明目前黄土高原的严重水土流失是人类破坏植被,不合理利用土地和直接毁灭土壤透水和抗冲能力的结果,而不是一个天然的地质过程。以“28字方略”为中心的水土保持措施是开发整治黄土高原水土资源和治理黄河的根本。 相似文献
132.
Min Hoan Moon Jeong Yeon Cho Yu Mi Lee Sung Il Jung Jae Hyug Yang Moon Young Kim Hyun-Mee Ryu Jin Hoon Chung Seong Ho Park 《黑龙江环境通报》2007,27(9):830-834
Objectives The aim of this study was to evaluate the role of nasal bone assessment in first-trimester screening for Down syndrome (DS) in the Korean population. Methods From July 2004 to March 2006, we prospectively evaluated the fetal nasal bones at 11–14 weeks' gestation in the Korean population. Results A successful evaluation was possible in 6490 of 6787 fetuses (95.6%). Absent, hypoechoic, and short nasal bones were seen in 4 (26.7%), 4 (26.7%), and 1 (6.7%) of 15 fetuses with DS, respectively, whereas in 5 (0.1%), 11 (0.2%), and 246 (3.8%) of 6456 normal fetuses. The incidence of absent and hypoechoic nasal bone showed significant differences between normal fetuses and fetuses with DS (P < 0.0005, both). Screening for DS using an absent or hypoechoic nasal bone resulted in a sensitivity of 53.3%, a specificity of 99.8%, a positive likelihood ratio of 215.2, and a negative likelihood ratio of 0.5. Conclusion Our study showed that nasal bone abnormality at 11–14 weeks of gestation had a high association with DS in the Korean population. This suggests that nasal bone assessment can be used to supplement the current first-trimester screening for DS in the Korean population. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
133.
有关全球气候变化问题上的公平性分析 总被引:11,自引:0,他引:11
从《联合国气候变化》了发,对人类社会应对气候变化中的“公平”性问题,从不同角度进行了系统讨论。对发展中国家和发达国家在公平原则下责任、义务及优先事项的差别进行了分析,提出并分析了以人均碳排放权相等为标准,到目标年(例2100年)各国人均碳排放量及过渡期内(例1990-2100)人均累积碳排放量两个趋同的碳排放权分配原则。 相似文献
134.
Summary Our paper addresses field survivorship of first instar monarch butterfly larvae (Danaus plexippus L., Lep.: Danainae) in relation to the dual cardenolide and latex chemical defenses of the sand hill milkweed plant,Asclepias humistrata (Asclepiadaceae) growing naturally in north central Florida. Survival of first instar larvae in the field was 11.5% in the first experiment (15–20 April 1990), and dropped to 3.4% in the second experiment (20–30 April). About 30% of the larvae were found glued to the leaf surface by the milkweed latex. Predator exclusion of non-flying inverte-brates by applying tanglefoot to the plant stems suggested that the balance of the mortality was due to volant inverte-brates, or to falling and/or moving off the plants. Regression analyses to isolate some of the other variables affecting survivorship indicated that first instar mortality was correlated with (1) increasing cardiac glycoside concentration of the leaves, (2) increasing age of the plants, and (3) the temporal increase in concentration of cardiac glycosides in the leaves. The study also provided confirmatory data of previous studies that wild monarch females tend to oviposit onA. humistrata plants containing intermediate concentrations of cardiac glycosides. Cardiac glycoside concentration in the leaves was not correlated with that in the latex. The concentration of cardenolide in the latex is extremely high, constituting an average of 1.2 and 9.5% of the mass of the wet and dry latex, respectively. The data suggest that an increase in water content of the latex is compensated for by an influx of cardenolide with the result that the cardenolide concentration remains constant in the latex systems of plants that are growing naturally. We also observed first instar larvae taking their first bite of milkweed leaves in the field. In addition to confirming other workers findings that monarch larvae possess elaborate sabotaging behaviour of the milkweed's latex system, we discovered that several larvae on their first bite involuntarily imbided a small globule of latex and instantly became cataleptic. This catalepsis, lasting up to 10 min, may have been in response to the high concentration of cardenolide present in the latex ofA. humistrata, more than 10 times that in the leaves. The results of the present study suggest that more attention should be directed to plant chemical defenses upon initial attack by first instar insect larvae, rather than attempting correlations of plant chemistry with older larvae that have already passed the early instar gauntlet. The first bite of neonate insects may be the most critical moment for coping with the chemical defenses of many plants and may play a much more important role in the evolution of insect herbivory than has previously been recognized. 相似文献
135.
Evelyn Pluhar 《Journal of Agricultural and Environmental Ethics》1992,5(2):189-215
Kathryn Paxton George has recently argued that vegetarianism cannot be a moral obligation for most human beings, even if Tom Regan is correct in arguing that humans and certain nonhuman animals are equally inherently valuable. She holds that Regan's liberty principle permits humans to kill and eat innocent others who have a right to life, provided that doing so prevents humans from being made worse off. George maintains that obstaining from meat and dairy products would in fact make most humans worse off. I argue that Regan's liberty principle either contradicts his equal rights view or does not permit the slaughter of another for food. I show that a different view recognizing the moral rights of nonhumans but according them less value than normal adult humans, the unequal rights view, would permit such action if human survival or health depended upon it. However, it would also permit the slaughter of innocent humans in the same circumstances. Finally, I argue that current nutritional research does not support George's contention that most humans would suffer if they ceased eating other animals and their products. 相似文献
136.
137.
论述了工艺分析在模具设计中的主导地位,着重指出冲压工艺方案的合理性是设计好模具的首要条件.并介绍了模具结构、工作原理及模具的使用情况. 相似文献
138.
139.
140.
Meckel–Gruber syndrome is a rare autosomal recessive disorder often resulting in neonatal death within a few hours of life. The condition is usually diagnosed ultrasonographically in the second trimester and earlier diagnosis has been mainly confined to high recurrence risk pregnancies. We describe the earliest non-invasive diagnosis of this condition at 12+2 weeks' gestation in a patient with no previous history using transabdominal ultrasound. Pregnancy termination was declined. Subsequent development of anhydramnios in the mid-trimester resulted in poor fetal visualization. We propose that first-trimester diagnosis of this condition is not only possible but preferable, as normal liquor volume facilitates visualization of fetal anatomy. 相似文献