全文获取类型
收费全文 | 45743篇 |
免费 | 645篇 |
国内免费 | 213篇 |
专业分类
安全科学 | 35886篇 |
废物处理 | 163篇 |
环保管理 | 2246篇 |
综合类 | 6940篇 |
基础理论 | 316篇 |
污染及防治 | 137篇 |
评价与监测 | 91篇 |
社会与环境 | 417篇 |
灾害及防治 | 405篇 |
出版年
2024年 | 139篇 |
2023年 | 604篇 |
2022年 | 905篇 |
2021年 | 1029篇 |
2020年 | 707篇 |
2019年 | 525篇 |
2018年 | 509篇 |
2017年 | 526篇 |
2016年 | 600篇 |
2015年 | 894篇 |
2014年 | 3225篇 |
2013年 | 2413篇 |
2012年 | 3442篇 |
2011年 | 3343篇 |
2010年 | 2663篇 |
2009年 | 3215篇 |
2008年 | 3180篇 |
2007年 | 2506篇 |
2006年 | 2758篇 |
2005年 | 2493篇 |
2004年 | 2397篇 |
2003年 | 2175篇 |
2002年 | 1454篇 |
2001年 | 977篇 |
2000年 | 743篇 |
1999年 | 539篇 |
1998年 | 468篇 |
1997年 | 401篇 |
1996年 | 367篇 |
1995年 | 329篇 |
1994年 | 247篇 |
1993年 | 176篇 |
1992年 | 233篇 |
1991年 | 184篇 |
1990年 | 137篇 |
1989年 | 98篇 |
排序方式: 共有10000条查询结果,搜索用时 703 毫秒
111.
Walter R Stahel 《中国人口.资源与环境(英文版)》2007,5(4):3-19
From an economic point of view, the industrial economy is efficient to overcome situations of a scarcity of goods. From a technological point of view, the resource efficiency of the manufacturing processes of the industrial economy has been permanently improved during the last 200 years. In addition, cleaner processes have been developed. However, from an ecologic point of view, an increasing world population with increasing consumption has produced a "global footprint" which approaches the carrying capacity of the planet. A circular economy and its high-value spin-offs-a lake economy and a performance or functional service economy-can fulfil customers' needs with considerably less resource consumption, less environmental impairment in production and considerably less end-of-life product waste, especially in situations of affluence, when a considerable stock of physical goods and infrastructures exists. Also, in situations of a scarcity of natural resources, both energy and materials, often characterised by rapidly rising resource prices, the economic actors of a circular economy have a high competitive advantage over the actors of the industrial economy, due to much lower procurement costs for materials and energy. From a social point of view, a circular economy increases the number of skilled jobs in regional enterprises. However, the shift from a linear manufacturing economy to a circular or service economy means a change in economic thinking from flow (throughput) management to stock (asset) management: in a manufacturing economy with largely unsaturated markets, total wealth increases through accumulation as resource throughput (flow) is transformed into a higher stock of goods of better quality (but in a manufacturing economy with largely saturated markets, wealth represented by the stock of goods will no longer increase); in a circular or service economy, total wealth increases through a smart management of existing physical assets (stock) that are adapted to changes in both technology and customer demand. This second approach not only applies to physical capital but equally to social capital, such as health and education and green GDP. To measure the social wealth of a population, it is not the amount of money spent on schools and hospitals that matters, butif this expenditure has led to a better education of the students, and a better health of the people. 相似文献
112.
113.
114.
江苏油田泄洪道内现有计量平台21座、单井平台146座、集油干线23km、注水干线15km、采油单井管线32km、注水单井管线18km、变压器94台、10kv电力线路长约66km。因为泄洪区域特殊的地理环境条件 ,泄洪道内平台的设计、建设的不规范因素以及平台上各设施生产工艺流程的复杂性 ,决定了生产及辅助系统存在着较多的危险因素。由于洪水、波浪、风等因素对平台、油井的侵袭 ,造成其基础松动、腐蚀严重、结构强度降低、承载能力下降、抗倾覆能力减弱 ,再加上设计、人为等因素 ,容易导致事故的发生 ;对于整个工艺流程来说 ,油气在井口、阀门、油气分… 相似文献
115.
117.
118.
119.
对上海市危险废物安全填埋场的研究与探讨 总被引:1,自引:0,他引:1
本文就上海危险废物产生状况,建设危险废物安全填埋场的必要性和项目建设的特点进行了分析和探讨,研究了上海地区建设危险废物安全填埋场的实施方案。 相似文献
120.
余峻才 《安全.健康和环境》2003,3(6):42-42
在广州石化厂化工区大修、改造中 ,负责凉水塔填料更换的某施工队施工结束 ,施工人员清理完场地正准备离开。我和往常一样来到现场检查安全工作 ,现场的施工人员见到我都很热情地跟我打招呼 ,并热情地邀请我到他们家乡玩。在场的几位负责人也把我围住 ,说了好些感激的话。这种情境我始料不及 ,他们的热情就像一股暖流 ,冲淡了我所有的辛酸。该施工队共有27名施工人员 ,干起活来个个都是好手 ,只是个人安全意识不强。十几米高的架子上作业 ,你强调的时候 ,他们就系上安全带 ,你刚转过身 ,绑在他们身上的安全带就形同虚设 ;用砂轮机切割角钢时… 相似文献