全文获取类型
收费全文 | 1702篇 |
免费 | 50篇 |
国内免费 | 24篇 |
专业分类
电工技术 | 7篇 |
综合类 | 58篇 |
化学工业 | 876篇 |
金属工艺 | 91篇 |
机械仪表 | 37篇 |
建筑科学 | 56篇 |
矿业工程 | 83篇 |
能源动力 | 45篇 |
轻工业 | 45篇 |
水利工程 | 5篇 |
石油天然气 | 32篇 |
武器工业 | 6篇 |
无线电 | 8篇 |
一般工业技术 | 92篇 |
冶金工业 | 281篇 |
原子能技术 | 8篇 |
自动化技术 | 46篇 |
出版年
2024年 | 2篇 |
2023年 | 20篇 |
2022年 | 20篇 |
2021年 | 29篇 |
2020年 | 35篇 |
2019年 | 55篇 |
2018年 | 38篇 |
2017年 | 27篇 |
2016年 | 33篇 |
2015年 | 50篇 |
2014年 | 129篇 |
2013年 | 108篇 |
2012年 | 152篇 |
2011年 | 169篇 |
2010年 | 106篇 |
2009年 | 78篇 |
2008年 | 74篇 |
2007年 | 95篇 |
2006年 | 61篇 |
2005年 | 65篇 |
2004年 | 46篇 |
2003年 | 54篇 |
2002年 | 39篇 |
2001年 | 39篇 |
2000年 | 32篇 |
1999年 | 39篇 |
1998年 | 33篇 |
1997年 | 23篇 |
1996年 | 25篇 |
1995年 | 19篇 |
1994年 | 14篇 |
1993年 | 7篇 |
1992年 | 5篇 |
1991年 | 3篇 |
1990年 | 6篇 |
1989年 | 4篇 |
1988年 | 6篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 6篇 |
1984年 | 3篇 |
1983年 | 5篇 |
1982年 | 4篇 |
1981年 | 3篇 |
1980年 | 3篇 |
1979年 | 3篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有1776条查询结果,搜索用时 15 毫秒
21.
22.
精炼渣泡沫化的实验研究 总被引:1,自引:0,他引:1
在硅钼炉和感应炉中,对精炼炉熔渣CaO-SiO2-MgO-Al2O3-CaF2渣系的发泡性能进行了实验室研究,测试不同熔渣碱度、温度、发泡剂成分等对熔渣发泡效果的影响,并讨论了熔渣的表面张力和粘度等物性与熔渣泡沫化程度的关系。 相似文献
23.
在目前的原燃料条件下,为保证马钢2500m3高炉炉渣具有良好的流动性和较高的脱硫能力,炉渣的CaO/SiO2应控制在1.05至1.15之间,炉渣温度不低于1450℃. 相似文献
24.
In-Ho Jung 《Calphad》2010
Computerized thermodynamic databases for solid and liquid steel, slags and solid oxide solutions, for large numbers of components, have been developed over the last three decades by critical evaluation/optimization of all available phase equilibrium and thermodynamic data. The databases contain model parameters specifically developed for molten slags, liquid and solid steel and solid oxide solutions. With user-friendly software, which accesses these databases, complex chemical reactions and phase equilibria occurring throughout the steelmaking process can be calculated over wide ranges of temperature, oxygen potential and pressure. In the present article, the thermodynamic models and databases for molten slag and liquid steel included in well-known thermochemical packages and their applications to complex steelmaking processes involving molten slag, steel, inclusions, refractories and gases are reviewed. 相似文献
25.
Jun Cao Ayush Goyal Krista A. Novstrup Samuel P. Midkiff James M. Caruthers 《International journal of parallel programming》2009,37(2):127-152
Well designed domain specific languages have three important benefits: (1) the easy expression of problems, (2) the application
of domain specific optimizations (including parallelization), and (3) dramatic improvements in productivity for their users.
In this paper we describe a compiler and parallel runtime system for modeling the complex kinetics of rubber vulcanization
and olefin polymerization that achieves all of these goals. The compiler allows the development of a system of ordinary differential
equations describing a complex vulcanization reaction or single-site olefin polymerization reaction—a task that used to require
months—to be done in hours. A specialized common sub-expression elimination and other algebraic optimizations sufficiently
simplify the complex machine generated code to allow it to be compiled—eliminating all but 8.0% of the operations in our largest
program and enabling over 60 times faster execution on our largest benchmark codes. The parallel runtime and dynamic load
balancing scheme enables fast simulations of the model. 相似文献
26.
K. Beketayev G.H. Weber M. Haranczyk P.‐T. Bremer M. Hlawitschka B. Hamann 《Computer Graphics Forum》2011,30(3):663-672
Studying transformation in a chemical system by considering its energy as a function of coordinates of the system's components provides insight and changes our understanding of this process. Currently, a lack of effective visualization techniques for high‐dimensional energy functions limits chemists to plot energy with respect to one or two coordinates at a time. In some complex systems, developing a comprehensive understanding requires new visualization techniques that show relationships between all coordinates at the same time. We propose a new visualization technique that combines concepts from topological analysis, multi‐dimensional scaling, and graph layout to enable the analysis of energy functions for a wide range of molecular structures. We demonstrate our technique by studying the energy function of a dimer of formic and acetic acids and a LTA zeolite structure, in which we consider diffusion of methane. 相似文献
27.
B2O3对CaO基渣精炼的助熔作用和脱硫的影响 总被引:2,自引:2,他引:2
使用RTW-08熔体物性测定仪通过旋转粘度计法测定了熔渣的粘度.试验结果表明,B2O3和CaF2在46%CaO-10%BaO-11.2%SiO2-11.6%Al2O3基础渣系中的助熔效果相当;在CaO-SiO2-10%BaO-11.6%Al2O3-10%CaF2基渣的碱度(CaO+BaO)/(SiO2+B2O3)为2.5和2.8时,用B2O3替代1/4 SiO2后精炼渣高温熔化性能稳定,粘度值降低至0.3~0.5 Pa·s;碱度2.8时,含20.6%SiO2渣剂的脱硫率为85%(S含量由0.008%降至0.001 6%),而含10.3%SiO2-10.3%B2O3渣剂的脱硫率为91.3%(S含量由0.008%降至0.000 7%). 相似文献
28.
对LF用低氟泡沫渣的精炼性能进行了实验研究。CaO—A12O3—SiO2系精炼渣的精炼性能和发泡性能存在一定的冲突,需要根据实际生产的要求加以综合考虑。实验中得到合适的LF泡沫精炼渣的组成为,%:CaO45~60,A12O3 30-40.SiO2 10-15,MgO5~10,曼内斯曼指数MI在0.15左右。 相似文献
29.
高碱度渣精炼对轴承钢夹杂物的影响 总被引:4,自引:2,他引:4
对国内外几家特钢厂生产的GCr15轴承钢中夹杂物进行了试验分析 ,结果表明 ,在炉渣碱度较高 (CaO SiO2 =3~ 4 5 )的精炼条件下 ,低氧含量 (≤ 7× 10 - 6 )的轴承钢中夹杂物主要为 :含Cr、Fe的复合MnS夹杂 ,TiN型夹杂 ,具有不同MgO含量的镁铝尖晶石 (MgO·Al2 O3)夹杂 ;未发现单独存在的铝酸钙型 (CaO·Al2 O3)球状夹杂物。随渣碱度提高和钢中氧含量降低 ,镁铝尖晶石夹杂物中的MgO含量增加 ;当渣系碱度CaO SiO2 达 4 5时 ,镁铝尖晶石夹杂物中含有CaO。 相似文献
30.
The effect of gypsum in slag-blended cement on free and restrained shrinkage of concrete subjected to various curing conditions
is presented in this paper. Added gypsum in slag-blended cements was found to increase the autogenous shrinkage of concrete
up to 56 days. However, added gypsum caused small reduction in the long-term shrinkage when the concrete was exposed to drying.
Slag concretes with 3% added gypsum content, when exposed to drying at the age of 24 h, exhibited more cracking tendency than
comparable concrete with 0% added gypsum. This is attributed to the increased shrinkage evolution of slag concrete with 3%
gypsum content at early ages. However, if moist cured for 7 days, increasing the amount of gypsum from 3 to 5% in slag-blended
cement reduced the cracking tendency. It is concluded that the beneficial effect of increasing gypsum in reducing cracking
tendency in slag concrete is only favourable if moist cured for 7 days. 相似文献