全文获取类型
收费全文 | 692篇 |
免费 | 8篇 |
国内免费 | 14篇 |
专业分类
安全科学 | 20篇 |
废物处理 | 43篇 |
环保管理 | 62篇 |
综合类 | 297篇 |
基础理论 | 84篇 |
污染及防治 | 165篇 |
评价与监测 | 35篇 |
社会与环境 | 8篇 |
出版年
2020年 | 6篇 |
2019年 | 6篇 |
2018年 | 14篇 |
2017年 | 14篇 |
2016年 | 25篇 |
2015年 | 6篇 |
2014年 | 16篇 |
2013年 | 35篇 |
2012年 | 27篇 |
2011年 | 38篇 |
2010年 | 24篇 |
2009年 | 21篇 |
2008年 | 29篇 |
2007年 | 29篇 |
2006年 | 29篇 |
2005年 | 15篇 |
2004年 | 13篇 |
2003年 | 14篇 |
2002年 | 6篇 |
2001年 | 10篇 |
2000年 | 12篇 |
1999年 | 8篇 |
1993年 | 6篇 |
1992年 | 6篇 |
1983年 | 5篇 |
1977年 | 6篇 |
1976年 | 5篇 |
1966年 | 5篇 |
1965年 | 8篇 |
1964年 | 5篇 |
1963年 | 5篇 |
1962年 | 8篇 |
1961年 | 5篇 |
1960年 | 7篇 |
1959年 | 9篇 |
1957年 | 13篇 |
1956年 | 9篇 |
1955年 | 9篇 |
1954年 | 9篇 |
1952年 | 6篇 |
1941年 | 7篇 |
1940年 | 9篇 |
1939年 | 10篇 |
1937年 | 8篇 |
1936年 | 6篇 |
1935年 | 11篇 |
1934年 | 7篇 |
1931年 | 5篇 |
1927年 | 5篇 |
1926年 | 5篇 |
排序方式: 共有714条查询结果,搜索用时 15 毫秒
181.
182.
183.
184.
185.
Erhan Kayabasi Munip Alpaslan Alperen Hüseyin Kurt 《International Journal of Green Energy》2019,16(2):200-210
In this study, the effects of geometric properties such as baffle spacing, baffle cut, sealing strips, gaps between heat exchanger components, number of tubes and tube passes have been investigated for shell and tube heat exchangers (STHE). For this purpose, geometrical dimensions and data of a specific heat exchanger (HE) used in an industrial application have been obtained. The HTRI Xchanger Suite Educational software was utilized to analyze the reference HE, to verify the results of the software and the output temperatures of the fluids, the shell side heat transfer coefficient (HTC) and the pressure loss (PL) values were compared with the experimental data. After confirming that the results of the software were within the acceptable deviation values, the geometric dimensions of the reference design were changed and new analyzes were carried out to examine the effects of several dimension options on the performance of STHE. Results were discussed in a detailed and comprehensive manner via curves. 相似文献
186.
Regeneration of pure water is an important issue not only for the healthy life but also for the fine control of precise processes in various industries.One important issue in ultrahigh purified water is to reduce the amount of total organic carbon(TOC).Herein,we introduce a new approach to reduce the TOC using the surface silanized nanoparticles,in which the magnetic nanoparticles(mNPs) are silanized and then complexed with ion exchange resin(IER) beads.The Fe_3O_4 mNPs are surface modified by using high concentrated vinyltrimethoxysilane(VTMS) and then adhered on the surface of IER beads.The surface modified mNPs have a thick-shell of polysiloxane layer varying from 5 to 22 nm depending on the amount of VTMS used,which leads the significant increase of specific surface area.The IER beads embedding VTMS-silanized mNPs achieves about 7 μg/L of the TOC level in ultrapure water system,which is two orders less than 228 μg/L of the feeding water and one order less than 96 μg/L from the system using pristine IER beads.This result is mainly attributed to the polysiloxane layer forming broccoli-like surface structure and some part by the vinyl group of VTMS exposed to the amines in the water. 相似文献
187.
188.
189.
190.