全文获取类型
收费全文 | 16730篇 |
免费 | 201篇 |
国内免费 | 137篇 |
专业分类
安全科学 | 467篇 |
废物处理 | 598篇 |
环保管理 | 2307篇 |
综合类 | 3336篇 |
基础理论 | 4141篇 |
环境理论 | 10篇 |
污染及防治 | 4100篇 |
评价与监测 | 1014篇 |
社会与环境 | 963篇 |
灾害及防治 | 132篇 |
出版年
2022年 | 125篇 |
2021年 | 131篇 |
2020年 | 116篇 |
2019年 | 140篇 |
2018年 | 214篇 |
2017年 | 249篇 |
2016年 | 346篇 |
2015年 | 295篇 |
2014年 | 390篇 |
2013年 | 1396篇 |
2012年 | 499篇 |
2011年 | 663篇 |
2010年 | 528篇 |
2009年 | 590篇 |
2008年 | 667篇 |
2007年 | 694篇 |
2006年 | 641篇 |
2005年 | 520篇 |
2004年 | 523篇 |
2003年 | 517篇 |
2002年 | 457篇 |
2001年 | 555篇 |
2000年 | 437篇 |
1999年 | 260篇 |
1998年 | 206篇 |
1997年 | 203篇 |
1996年 | 225篇 |
1995年 | 228篇 |
1994年 | 232篇 |
1993年 | 211篇 |
1992年 | 220篇 |
1991年 | 210篇 |
1990年 | 211篇 |
1989年 | 178篇 |
1988年 | 157篇 |
1987年 | 136篇 |
1986年 | 160篇 |
1985年 | 161篇 |
1984年 | 163篇 |
1983年 | 167篇 |
1982年 | 160篇 |
1981年 | 170篇 |
1980年 | 158篇 |
1979年 | 152篇 |
1978年 | 115篇 |
1977年 | 128篇 |
1974年 | 109篇 |
1973年 | 96篇 |
1972年 | 107篇 |
1968年 | 88篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
151.
152.
153.
Chemical process simulation (CPS) software has been widely used by chemical (process) engineers to design, test, optimise, and integrate process plants. It is expected that industrial ecologists to bring these same problem-solving benefits to the design and operation of industrial ecosystems can use CPS. This paper provides industrial ecology researchers and practitioners with an introduction to CPS and an overview of chemical engineering design principles. The paper highlights recent research showing that CPS can be used to model industrial ecosystems, and discusses the benefits of using CPS to address some of the technical challenges facing companies participating in an industrial ecosystem. CPS can be used to (i) quantitatively evaluate and compare the potential environmental and financial benefits of material and energy linkages; (ii) solve general design, retrofit, or operational problems; (iii) help to identify complex and often counter-intuitive solutions; and (iv) evaluate what-if scenarios. CPS should be a useful addition to the industrial ecology toolbox. 相似文献
154.
155.
156.
K. E. Kaissling G. Kasang H. J. Bestmann W. Stransky O. Vostrowsky 《Die Naturwissenschaften》1978,65(7):382-384
The female silkmoth Bombyx mori L. emits a second pheromone component bombykal (E-10, Z-12-hexade-cadien-1-al) in addition to the well-known sexual attractant bombykol (E-10, Z-12-hexadecadien-1-ol). Bombykal stimulates its own specialized and highly sensitive olfactory cells of the male moth. Surprisingly, the aldehyde inhibits the release of the male's wing-fluttering response to bombykol. 相似文献
157.
158.
M. Peter Marinkovich MD Guerrino Meneguzzi Robert E. Burgeson Claudine Blanchet-Bardon Karen A. Holbrook Lynne T. Smith Angela M. Christiano Jean-Paul Ortonne 《黑龙江环境通报》1995,15(11):1027-1034
Herlitz junctional epidermolysis bullosa (HJEB) is a severe blistering disorder which usually results in death during infancy. We have previously shown that the anchoring filament protein laminin-5 (kalinin/nicein), which mediates keratinocyte attachment and dermal–epidermal cohesion, is abnormally expressed in individuals with HJEB. Laminin-5 was detected by Western blot analysis in amniotic fluid from 44 consecutive normal secondtrimester control pregnancies, but was undetectable in second-trimester amniotic fluid from four pregnancies with fetuses affected by HJEB. In one case of severe non-Herlitz JEB, laminin-5 was detected in both amniotic fluid and skin. In human amniotic fluid, the laminin-5 a3 subunit was processed to a major 165 kD species and a minor 145 kD species and the β2 subunit was partially processed to 105 kD. Although laminin-5 was covalently associated with laminin-6 (K-laminin) in amniotic membrane, no covalent interaction was detected in amniotic fluid. Laminin-5 from amniotic fluid strongly supported keratinocyte attachment. These results suggest that Western blot analysis of second-trimester amniotic fluid is useful in determining the prenatal diagnosis of HJEB and that laminin-5 may serve a physiologically important function in amniotic fluid. 相似文献
159.
Five cases of mosaicism for an isochromosome of 20q have been detected from a total of 50 000 cases analysed for prenatal diagnosis by amniocentesis. Karyotypes were designated mos 46,X_/46,X_,i(20q). In all cases, the abnormal cell line was detected in more than one primary culture, thus fulfilling the criterion for true (level III) mosaicism. Indications for prenatal diagnosis were parental anxiety (two cases), low maternal serum alpha-fetoprotein (AFP) (two cases), and high maternal serum AFP (one case). Level II ultrasounds on all five fetuses were normal, and the abnormal cell line was never detected in fetal blood and/or cord blood. All five pregnancies were continued and had normal outcomes, with birth weights ranging from 2.4 to 3.8 kg. The development of all five children has been normal, with the oldest child in the study now 4 years of age. We suggest that the abnormal cell line in each case was of extrafetal origin, and that this may be one of the more common examples of this phenomenon, occurring in approximately 1/10000 prenatal diagnoses. Mosaicism i(20q) may have been missed in the past because of the higher resolution necessary to detect this subtle change. 相似文献
160.
Dr. Michael J. McCormack Margaret E. Rylance William E. Mackenzie John Newton 《黑龙江环境通报》1990,10(4):253-255
The attitudes of 190 patients who had undergone chorionic villus sampling (CVS) were assessed by means of a questionnaire. One hundred and fifty-two patients replied of whom 68 (45 per cent) were referred because of increased maternal age and in the other 84 cases the indications included previous chromosomal abnormalities, fetal sexing, DNA analysis, and biochemical analysis. One hundred and twenty-two patients had a transcervical procedure, 24 had a transabdominal, and six patients required both procedures. One hundred and forty-one patients (93 per cent) reported CVS to be a satisfactory procedure, and the same percentage thought earlier diagnosis was beneficial. Thirty-nine patients (81 per cent) reported a better experience with CVS than with a previous amniocentesis. A majority of patients (93 per cent) wished a CVS in a future pregnancy and 137 patients (97 per cent) would accept a risk of miscarriage from the procedure of twice that quoted for amniocentesis (1 per cent). 相似文献