全文获取类型
收费全文 | 157篇 |
免费 | 3篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 2篇 |
综合类 | 20篇 |
化学工业 | 17篇 |
金属工艺 | 4篇 |
机械仪表 | 14篇 |
建筑科学 | 13篇 |
矿业工程 | 2篇 |
能源动力 | 4篇 |
轻工业 | 8篇 |
水利工程 | 7篇 |
石油天然气 | 41篇 |
无线电 | 2篇 |
一般工业技术 | 10篇 |
冶金工业 | 5篇 |
自动化技术 | 13篇 |
出版年
2024年 | 1篇 |
2023年 | 4篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 14篇 |
2019年 | 14篇 |
2018年 | 4篇 |
2017年 | 5篇 |
2016年 | 6篇 |
2015年 | 3篇 |
2014年 | 5篇 |
2013年 | 10篇 |
2012年 | 5篇 |
2011年 | 8篇 |
2010年 | 1篇 |
2009年 | 9篇 |
2008年 | 6篇 |
2007年 | 7篇 |
2006年 | 8篇 |
2005年 | 11篇 |
2004年 | 2篇 |
2003年 | 8篇 |
2002年 | 3篇 |
2001年 | 4篇 |
2000年 | 6篇 |
1999年 | 4篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1978年 | 1篇 |
排序方式: 共有162条查询结果,搜索用时 15 毫秒
1.
《Oil and Energy Trends》2023,48(2):35-43
Current data of world oil demand. This includes international bunkers and refinery fuel. Updated on a monthly basis. Current data of oil demand from counties such as Canada, the United States of America, Japan, OECD Europe, Belgium, France, Germany, Italy, Netherlands, Spain, Sweden, the United Kingdom, Australia, Mexico, Republic of Korea, and Turkey. Updated on a monthly basis. Current data for crude oil and refined product stocks in Canada, Chile, Mexico, the United States (Western Hemisphere), France, Germany, Italy, Netherlands, Spain, the United Kingdom and Other Europe (Europe), Japan, Republic of Korea, Other Pacific (Asia-Pacific), and Total OECD (Table 12.1) Current data for refined product stocks in the OECD Western Hemisphere, OECD Europe, OECD Asia-Pacific and Total OECD. Products include gasoline, diesel and gasoil, and heavy fuel oil. Updated on a monthly basis (Table 12.2). 相似文献
2.
《Oil and Energy Trends》2019,44(9):31-39
Current data of world oil demand. This includes international bunkers and refinery fuel. Updated on a monthly basis. Current data of oil demand from counties such as Canada, the United States of America, Japan, OECD Europe, Belgium, France, Germany, Italy, Netherlands, Spain, Sweden, the United Kingdom, Australia, Mexico, Republic of Korea, and Turkey. Updated on a monthly basis. Current data for crude oil and refined product stocks in Canada, Chile, Mexico, the United States (Western Hemisphere), France, Germany, Italy, Netherlands, Spain, the United Kingdom and Other Europe (Europe), Japan, Republic of Korea, Other Pacific (Asia-Pacific), and Total OECD (Table 12.1) Current data for refined product stocks in the OECD Western Hemisphere, OECD Europe, OECD Asia-Pacific and Total OECD. Products include gasoline, diesel and gasoil, and heavy fuel oil. Updated on a monthly basis (Table 12.2). 相似文献
3.
《Oil and Energy Trends》2019,44(11):37-45
Current data of world oil demand. This includes international bunkers and refinery fuel. Updated on a monthly basis. Current data of oil demand from counties such as Canada, the United States of America, Japan, OECD Europe, Belgium, France, Germany, Italy, Netherlands, Spain, Sweden, the United Kingdom, Australia, Mexico, Republic of Korea, and Turkey. Updated on a monthly basis. Current data for crude oil and refined product stocks in Canada, Chile, Mexico, the United States (Western Hemisphere), France, Germany, Italy, Netherlands, Spain, the United Kingdom and Other Europe (Europe), Japan, Republic of Korea, Other Pacific (Asia-Pacific), and Total OECD (Table 12.1) Current data for refined product stocks in the OECD Western Hemisphere, OECD Europe, OECD Asia-Pacific and Total OECD. Products include gasoline, diesel and gasoil, and heavy fuel oil. Updated on a monthly basis (Table 12.2). 相似文献
4.
刘泽仁 《西华大学学报(自然科学版)》2000,19(3):58-60
我国投资融资体制改革已取得很重大进展。但是仍存在一些问题 ,主要是 :社会融资结构不合理 ,社会融资风险难以释放 ;投资主体没有形成一个完整体系 ,社会融投资效率不高 ;社会投资效益不好 ;缺乏风险投资机制。改革的思路是 :进一步转变政府职能 ,必须加快资本市场的建设步伐。 相似文献
5.
This paper explores the underlying drivers of steel production to predict the fate of the blast furnace as a steelmaking route. Steel production is driven by demand for stocks of steel products and increases in steel stocks are driven by population growth and economic development. However, per-capita steel stocks are expected to saturate with economic development leading to the long-term saturation of steel demand. Combined with an increase in the availability of end-of-life scrap, this suggests that the electric arc furnace route will be increasingly dominant. Furthermore, with an increasingly resource and carbon constrained world, material efficiency strategies will be required to provide the same services with less liquid steel. These factors may usher in the end of the blast furnace era within the next 50 years. This paper is based on research undertaken as part of the WellMet2050 project, and was delivered at the Cleveland Institution of Engineers debate in December 2014. 相似文献
6.
7.
《Oil and Energy Trends》2021,46(1):29-37
Current data of world oil demand. This includes international bunkers and refinery fuel. Updated on a monthly basis. Current data of oil demand from counties such as Canada, the United States of America, Japan, OECD Europe, Belgium, France, Germany, Italy, Netherlands, Spain, Sweden, the United Kingdom, Australia, Mexico, Republic of Korea, and Turkey. Updated on a monthly basis. Current data for crude oil and refined product stocks in Canada, Chile, Mexico, the United States (Western Hemisphere), France, Germany, Italy, Netherlands, Spain, the United Kingdom and Other Europe (Europe), Japan, Republic of Korea, Other Pacific (Asia‐Pacific), and Total OECD (Table 12.1) Current data for refined product stocks in the OECD Western Hemisphere, OECD Europe, OECD Asia‐Pacific and Total OECD. Products include gasoline, diesel and gasoil, and heavy fuel oil. Updated on a monthly basis (Table 12.2). 相似文献
8.
《Oil and Energy Trends》2020,45(1):35-43
Current data of world oil demand. This includes international bunkers and refinery fuel. Updated on a monthly basis. Current data of oil demand from counties such as Canada, the United States of America, Japan, OECD Europe, Belgium, France, Germany, Italy, Netherlands, Spain, Sweden, the United Kingdom, Australia, Mexico, Republic of Korea, and Turkey. Updated on a monthly basis. Current data for crude oil and refined product stocks in Canada, Chile, Mexico, the United States (Western Hemisphere), France, Germany, Italy, Netherlands, Spain, the United Kingdom and Other Europe (Europe), Japan, Republic of Korea, Other Pacific (Asia-Pacific), and Total OECD (Table 12.1) Current data for refined product stocks in the OECD Western Hemisphere, OECD Europe, OECD Asia-Pacific and Total OECD. Products include gasoline, diesel and gasoil, and heavy fuel oil. Updated on a monthly basis (Table 12.2). 相似文献
9.
《Oil and Energy Trends》2020,45(9):29-37
Current data of world oil demand. This includes international bunkers and refinery fuel. Updated on a monthly basis. Current data of oil demand from counties such as Canada, the United States of America, Japan, OECD Europe, Belgium, France, Germany, Italy, Netherlands, Spain, Sweden, the United Kingdom, Australia, Mexico, Republic of Korea, and Turkey. Updated on a monthly basis. Current data for crude oil and refined product stocks in Canada, Chile, Mexico, the United States (Western Hemisphere), France, Germany, Italy, Netherlands, Spain, the United Kingdom and Other Europe (Europe), Japan, Republic of Korea, Other Pacific (Asia-Pacific), and Total OECD (Table 12.1) Current data for refined product stocks in the OECD Western Hemisphere, OECD Europe, OECD Asia-Pacific and Total OECD. Products include gasoline, diesel and gasoil, and heavy fuel oil. Updated on a monthly basis (Table 12.2). 相似文献
10.
Reuben Lembani Jasper Knight Elhadi Adam Felix Kanungwe Kalaba 《The International journal of environmental studies》2020,77(4):581-601
ABSTRACT There is a need for accurate reporting of the second-growth forest in accounting for the contribution of secondary forests to achieving global carbon sequestration strategies. This study develops a model relating aboveground live biomass (AGLB) to Landsat reflectance measurements, and this method is used on multi spatial-temporal Landsat data (1998, 2001, 2004, 2011 and 2016) to assess changes in Miombo woodlands in Zambia. Results showed that the enhanced vegetation index was a better predictor of AGLB (r2 = 0.96; RMSE = 0.24 t ha?1) than the other assessed vegetation indices. Forest carbon stocks increased by an average rate of 3.65 ± standard error (SE): 0.56 t ha?1 yr?1 from 1998 to 2001, but a continual decline was evident for the periods 2001–2004 (?0.60 t ha?1 yr?1), 2004–2011 (?0.88 t ha?1 yr?1) and 2011–2016 (?2.03 t ha?1 yr?1). The study provides an empirical model for evaluating carbon stock changes. 相似文献