全文获取类型
收费全文 | 382篇 |
免费 | 19篇 |
国内免费 | 46篇 |
专业分类
安全科学 | 38篇 |
环保管理 | 33篇 |
综合类 | 227篇 |
基础理论 | 101篇 |
环境理论 | 1篇 |
污染及防治 | 16篇 |
评价与监测 | 10篇 |
社会与环境 | 9篇 |
灾害及防治 | 12篇 |
出版年
2023年 | 4篇 |
2022年 | 6篇 |
2021年 | 13篇 |
2020年 | 7篇 |
2019年 | 7篇 |
2018年 | 6篇 |
2017年 | 6篇 |
2016年 | 8篇 |
2015年 | 4篇 |
2014年 | 8篇 |
2013年 | 17篇 |
2012年 | 8篇 |
2011年 | 32篇 |
2010年 | 12篇 |
2009年 | 13篇 |
2008年 | 16篇 |
2007年 | 17篇 |
2006年 | 28篇 |
2005年 | 20篇 |
2004年 | 23篇 |
2003年 | 18篇 |
2002年 | 16篇 |
2001年 | 13篇 |
2000年 | 4篇 |
1999年 | 9篇 |
1998年 | 6篇 |
1997年 | 4篇 |
1996年 | 4篇 |
1995年 | 14篇 |
1994年 | 15篇 |
1993年 | 6篇 |
1992年 | 11篇 |
1991年 | 17篇 |
1990年 | 4篇 |
1989年 | 14篇 |
1988年 | 10篇 |
1987年 | 13篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1982年 | 2篇 |
1981年 | 4篇 |
排序方式: 共有447条查询结果,搜索用时 15 毫秒
41.
42.
Maria Okumura Vera Aparecida dos Santos Mário E. Camargo Regina Schultz Marcelo Zugaib 《黑龙江环境通报》2004,24(3):179-181
The prenatal diagnosis of congenital transmission of Chagas' disease in a pregnant woman with the indeterminate form of the disease is reported. Sonography revealed fetal hydrops at 31 weeks' gestation. Anti-Trypanosoma cruzi IgM and IgG antibodies were negative in the fetal blood sampled by cordocentesis, but T. cruzi trypomastigotes were found in its buffy coat. Owing to anemia, in utero exchange transfusion was undertaken, but fetal demise ensued. Labor was induced and a stillborn infant weighing 2030 g was delivered. The pathological examination revealed placentitis and meningoencephalitis, myocarditis and splenitis in the stillborn fetus. Amastigotes were found in the myocardium, brain and placenta. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
43.
44.
45.
为了研究人群在自然属性和社会属性分类下的效应修饰作用,利用2005~2011年北京市大气PM2.5日均浓度、气象要素及循环系统疾病每日死亡人数数据,根据不同年龄、性别及学历将人群分组,采用时间序列的半参数广义相加模型(GAM),定量评价大气PM2.5对居民循环系统疾病死亡人数的影响.单污染物模型和多污染物模型结果表明,PM2.5为影响循环系统疾病每日死亡人数的主要大气污染物.北京市空气中PM2.5的浓度每增加10μg/m3,循环系统疾病总死亡人数增加0.50%(95% CI:0.36,0.63).不同人群的易感程度不同,各人群死亡人数的增加范围为0.23~0.71%,女性、60~74岁人群、文盲人群的健康风险相对较高.在文盲人群中,老年(60+)女性占比为66.2%,为了分离社会属性人群分类中可能存在的自然属性因素干扰,本文去除其中老年、女性这两个混杂因素的影响,文盲人群健康风险仍然大于较高学历的人群.年龄和性别因素叠加在学历因素上,可能加大低学历人群的健康风险,对于这部分叠加了自然因素和社会因素双重敏感性的人群应给与重点关注. 相似文献
46.
There has been tremendous development in the field of prenatal diagnosis of cardiac disease in the last 30 years. Early work centered on the technical aspects of providing an accurate assessment of cardiac structure and function. Techniques of fetal cardiac screening have been developed and utilized throughout the world. More recently, investigators have begun to explore the ramifications of fetal cardiac diagnosis by assessing measures of outcome. In this article, the field of fetal echocardiography, as a screening tool for identifying congenital heart disease, and its impact on disease outcome is reviewed. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
47.
48.
B. H. Kwa 《Environment, Development and Sustainability》2008,10(2):209-217
During Malaysia’s rapid economic development into becoming a middle income country in the past several decades, environmental
changes resulted in altered land use patterns because of agricultural practices such as large scale rice, rubber and oil palm
cultivation. The impact of environmental changes brought about by rice and rubber cultivation affected the breeding habitats
of mosquito vectors which in turn affected the prevalence of two strains of lymphatic filariasis in different ways. With scrub
typhus, the development of oil palm plantations affected the ecology of mite and rodent populations which resulted in very
high incidence of the disease in affected populations. Malaysia’s relentless urbanization has resulted in increased incidence
of dengue, as peridomestic mosquito vectors increasingly colonize urban habitats. This article discusses how ecological factors
determine the way lymphatic filariasis, scrub typhus and dengue were spread in Malaysia. The nation’s experience with environmental
changes due to rapid development provides lessons for other developing countries in control programs and public health policy. 相似文献
49.
A. V. Il’inykh 《Russian Journal of Ecology》2005,36(3):200-204
The impact of the nuclear polyhedrosis virus on the population dynamics of the gypsy moth Lymantria dispar L. has been studied. The results have shown that polyhedrosis morbidity in the western Siberian population of the insect is relatively low, compared to that reported for North American and European populations. A possible cause of this situation is found in the high migration activity of moths in the Asian L. dispar populations, which allows the virus load on the biotope to remain relatively stable and insufficient for the initiation of mass viral diseases during population outbreaks.__________Translated from Ekologiya, No. 3, 2005, pp. 222–226.Original Russian Text Copyright © 2005 by Ilinykh. 相似文献
50.
三峡库区虫媒和自然疫源性疾病分析 总被引:11,自引:0,他引:11
为了解三峡库区人群近7年来主要虫媒和自然疫源性疾病的发病水平和流行趋势,在选出的15个三峡库区人群健康监测点,按照《三峡库区疾病监测方案》,每月收集传染病发病资料及鼠、蚊类等媒介生物监测资料。结合全国传染病疫情报告系统的有关发病资料,分别进行不同年份、不同地区和不同季节发病趋势的比较和影响因素分析。连续7年的监测结果显示,甲类传染病鼠疫未发生,流行性出血热、钩端螺旋体病、流行性乙型脑炎、疟疾等以病媒生物传播为主要传播途径的虫媒和自然疫源性疾病累计报告病例157例,其总体发病呈下降趋势。疟疾、出血热发病水平明显低于全国,而钩体病和乙脑发病水平则高于全国,除疟疾外的其余3种疾病均伴有小的发病高峰出现,但仍以散发为主。表明这些与环境变化关系较为密切的虫媒和自然疫源性疾病的发生,随着工程施工、移民新址建设和移民搬迁并未发生明显变化。但由于环境因素影响的长期性、复杂性,仍需长期连续地开展监测,密切关注发病趋势的变化。 相似文献