全文获取类型
收费全文 | 200篇 |
免费 | 0篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 5篇 |
废物处理 | 6篇 |
环保管理 | 22篇 |
综合类 | 93篇 |
基础理论 | 20篇 |
污染及防治 | 35篇 |
评价与监测 | 8篇 |
社会与环境 | 11篇 |
灾害及防治 | 2篇 |
出版年
2022年 | 6篇 |
2021年 | 3篇 |
2019年 | 5篇 |
2018年 | 4篇 |
2017年 | 4篇 |
2016年 | 6篇 |
2015年 | 5篇 |
2014年 | 4篇 |
2013年 | 12篇 |
2012年 | 5篇 |
2011年 | 9篇 |
2010年 | 8篇 |
2009年 | 11篇 |
2008年 | 7篇 |
2007年 | 3篇 |
2006年 | 5篇 |
2005年 | 4篇 |
2004年 | 7篇 |
2003年 | 3篇 |
2001年 | 2篇 |
1999年 | 2篇 |
1992年 | 2篇 |
1988年 | 2篇 |
1980年 | 2篇 |
1964年 | 1篇 |
1963年 | 2篇 |
1961年 | 1篇 |
1960年 | 1篇 |
1959年 | 2篇 |
1957年 | 1篇 |
1955年 | 3篇 |
1933年 | 2篇 |
1932年 | 3篇 |
1930年 | 2篇 |
1929年 | 4篇 |
1928年 | 4篇 |
1927年 | 3篇 |
1926年 | 2篇 |
1925年 | 6篇 |
1924年 | 2篇 |
1923年 | 6篇 |
1922年 | 2篇 |
1921年 | 4篇 |
1920年 | 2篇 |
1919年 | 2篇 |
1918年 | 2篇 |
1917年 | 3篇 |
1915年 | 2篇 |
1914年 | 1篇 |
1913年 | 3篇 |
排序方式: 共有202条查询结果,搜索用时 78 毫秒
51.
52.
53.
Abiodun S. Momodu Elizabeth F. Aransiola Inioluwa D. Okunade Grace O. Ogunlusi Kehinde N. Awokoya Ibikunle O. Ogundari Olutope T. Falope Oladotun W. Makinde John‐Felix K. Akinbami 《Natural resources forum》2019,43(2):73-81
The study focused on Nigeria's polyurethane (PU) production process as a test case. Though it is currently insignificant when viewed from a global perspective, PU production in Nigeria is not eco‐friendly. Traditionally, PU is produced by reacting petro‐based polyol with a poly‐isocyanate, which is made from amines and phosgene and are currently imported into the country. These two materials are detrimental to the human health and environment, indicating that Nigeria's PU industries need to re‐examine their production inputs for environmental compliance. The objective of this study is to review the PU industry for nontoxic reagents that could be sourced locally vis‐à‐vis overcoming sustainable development (greening the economy) challenges in Nigeria. Non‐isocyanate polyurethane (NIPU) is preferred to petro‐polyurethane because, in comparison, NIPU has improved thermal and chemical resistance, porosity and water absorption, and is less toxic. Engaging local resources to produce PU is economically feasible; in addition, NIPU is relatively advantageous to human health and the environment. Aside from being economically feasible, production of NIPU in Nigeria has the propensity to greatly enlarge the growth of the existing PU industry to tremendous heights and contribute to diversifying and improving the overall economy. 相似文献
54.
A survey of cadmium residues in shellfish from the Atlantic Coast of South Carolina was undertaken to see the magnitude of cadmium contamination in the South Carolina Fishery. The shellfish collected were oysters, clams, crabs, shrimps, and scallops. Shellfish samples were dissected and pieces of edible muscle tissue were incubated in reagent grade nitric acid, at a constant temperature shaking-water bath at 58°C. Cadmium levels were determined by flame atomic absorption. The distribution pattern of the element Cd in shellfish is different in various species. It seems that shellfish contained more Cd content levels than other saltwater boney fish. It was found that Cd levels were relatively higher in oysters, shrimps, and clams than crabs and scallops. Larger shellfish had higher Cd content than the smaller shellfish of the same species. Elevated levels of Cd found in these shellfish species of edible fish were not high enough to render them dangerous for human consumption. 相似文献
55.
56.
57.
58.
59.
The Science of Nature - 相似文献
60.