全文获取类型
收费全文 | 7782篇 |
免费 | 655篇 |
国内免费 | 107篇 |
专业分类
系统科学 | 1153篇 |
丛书文集 | 94篇 |
教育与普及 | 72篇 |
理论与方法论 | 292篇 |
现状及发展 | 877篇 |
研究方法 | 7篇 |
综合类 | 6048篇 |
自然研究 | 1篇 |
出版年
2024年 | 15篇 |
2023年 | 24篇 |
2022年 | 30篇 |
2021年 | 43篇 |
2020年 | 23篇 |
2019年 | 14篇 |
2018年 | 745篇 |
2017年 | 756篇 |
2016年 | 458篇 |
2015年 | 86篇 |
2014年 | 65篇 |
2013年 | 69篇 |
2012年 | 329篇 |
2011年 | 1030篇 |
2010年 | 891篇 |
2009年 | 544篇 |
2008年 | 607篇 |
2007年 | 887篇 |
2006年 | 100篇 |
2005年 | 142篇 |
2004年 | 206篇 |
2003年 | 220篇 |
2002年 | 125篇 |
2001年 | 76篇 |
2000年 | 85篇 |
1999年 | 122篇 |
1998年 | 94篇 |
1997年 | 112篇 |
1996年 | 100篇 |
1995年 | 87篇 |
1994年 | 100篇 |
1993年 | 77篇 |
1992年 | 58篇 |
1991年 | 61篇 |
1990年 | 56篇 |
1989年 | 36篇 |
1988年 | 34篇 |
1987年 | 22篇 |
1986年 | 7篇 |
1985年 | 4篇 |
1984年 | 1篇 |
1978年 | 2篇 |
1967年 | 1篇 |
排序方式: 共有8544条查询结果,搜索用时 15 毫秒
961.
Microstructure and electrolysis behavior of self-healing Cu-Ni-Fe composite inert anodes for aluminum electrowinning 下载免费PDF全文
The microstructure evolution and electrolysis behavior of (Cu52Ni30Fe18)-xNiFe2O4 (x=40wt%, 50wt%, 60wt%, and 70wt%) composite inert anodes for aluminum electrowinning were studied. NiFe2O4 was synthesized by solid-state reaction at 950℃. The dense anode blocks were prepared by ball-milling followed by sintering under a N2 atmosphere. The phase evolution of the anodes after sintering was determined by scanning electron microscopy and energy-dispersive X-ray spectroscopy. The results indicate that a substitution reaction between Fe in the alloy phase and Ni in the oxide phase occurs during the sintering process. The samples were also examined as inert anodes for aluminum electrowinning in the low-temperature KF-NaF-AlF3 molten electrolyte for 24 h. The cell voltage during electrolysis and the corrosion scale on the anodes were analyzed. The results confirm that the scale has a self-repairing function because of the synergistic reaction between the alloy phase with Fe added and the oxide phase. The estimated wear rate of the (Cu52Ni30Fe18)-50NiFe2O4 composite anode is 2.02 cm·a-1. 相似文献
962.
Alkaline digestion behavior and alumina extraction from sodium aluminosilicate generated in pyrometallurgical process 下载免费PDF全文
Bo-na Deng Guang-hui Li Jun Luo Jing-hua Zeng Ming-jun Rao Zhi-wei Peng Tao Jiang 《矿物冶金与材料学报》2018,25(12):1380-1388
In pyrometallurgical process, Al-and Si-bearing minerals in iron and aluminum ores are easily transformed into sodium aluminosilicates in the presence of Na2O constituents, which alters the leaching behaviors of Al2O3 and SiO2. It was confirmed that sodium aluminosilicates with different phase compositions synthesized at various roasting conditions were effectively digested in the alkaline digestion process. Under the optimum conditions at temperature of 100-120℃, liquid-to-solid ratio (L/S) of 10:2 mL/g, caustic ratio of 4, and Na2O concentration of 240 g/L, the actual and relative digestion ratio of Al2O3 from the synthesized sodium aluminosilicates reached maximums of about 65% and 95%, respectively, while SiO2 was barely leached out. To validate the superior digestion property of sodium aluminosilicate generated via an actual process, the Bayer digestion of an Al2O3-rich material derived from reductive roasting of bauxite and comprising Na1.75Al1.75Si0.25O4 was conducted; the relative digestion ratio of Al2O3 attained 90% at 200℃. 相似文献
963.
Dynamic characteristics of the planetary gear train excited by time-varying meshing stiffness in the wind turbine 下载免费PDF全文
Wind power has attracted increasing attention as a renewable and clean energy. Gear fault frequently occurs under extreme environment and complex loads. The time-varying meshing stiffness is one of the main excitations. This study proposes a 5 degree-of-freedom torsional vibration model for the planetary gear system. The influence of some parameters (e.g., contact ratio and phase difference) is discussed under different conditions of a single teeth pair and double pairs of teeth. The impact load caused by the teeth face fault, ramped load induced by the complex wind conditions, and the harmonic excitation are investigated. The analysis of the time-varying meshing stiffness and the dynamic meshing force shows that the dynamic design under different loads can be made to avoid resonance, can provide the basis for the gear fault location of a wind turbine, and distinguish the fault characteristics from the vibration signals. 相似文献
964.
Small or smooth cloned regions are difficult to be detected in image copy-move forgery (CMF) detection. Aiming at this problem, an effective method based on image segmentation and swarm intelligent (SI) algorithm is proposed. This method segments image into small nonoverlapping blocks. A calculation of smooth degree is given for each block. Test image is segmented into independent layers according to the smooth degree. SI algorithm is applied in finding the optimal detection parameters for each layer. These parameters are used to detect each layer by scale invariant features transform (SIFT)-based scheme, which can locate a mass of keypoints. The experimental results prove the good performance of the proposed method, which is effective to identify the CMF image with small or smooth cloned region. 相似文献
965.
Hai-xia Qin Yong Li Li-xiong Bai Meng-long Long Wen-dong Xue Jun-hong Chen 《矿物冶金与材料学报》2017,24(3):324-331
In this work, Fe3Si-Si3N4-Al2O3 composites were prepared at 1300℃ in an N2 atmosphere using fused corundum and tabular alumina particles, Al2O3 fine powder, and ferrosilicon nitride (Fe3Si-Si3N4) as raw materials and thermosetting phenolic resin as a binder. The effect of ferrosilicon nitride with different concentrations (0wt%, 5wt%, 10wt%, 15wt%, 20wt%, and 25wt%) on the properties of Fe3Si-Si3N4-Al2O3 composites was investigated. The results show that the apparent porosity varies between 10.3% and 17.3%, the bulk density varies from 2.94 g/cm3 and 3.30 g/cm3, and the cold crushing strength ranges from 67 MPa to 93 MPa. Under the experimental conditions, ferrosilicon nitride, whose content decreases substantially, is unstable; part of the ferrosilicon nitride is converted into Fe2C, whereas the remainder is retained, eventually forming the ferrosilicon alloy. Thermodynamic assessment of the Si5AlON7 indicated that the ferrosilicon alloy accelerated the reactions between Si3N4 and α-Al2O3 fine powder and that Si in the ferrosilicon alloy was nitrided directly, forming β-SiAlON simultaneously. In addition, fused corundum did not react directly with Si3N4 because of its low reactivity. 相似文献
966.
Spheroidization of silica powders by radio frequency inductively coupled plasma with Ar-H2 and Ar-N2 as the sheath gases at atmospheric pressu 下载免费PDF全文
Amorphous spherical silica powders were prepared by inductively coupled thermal plasma treatment at a radio frequency of 36.2 MHz. The effects of the added content of hydrogen and nitrogen into argon (serving as the sheath gas), as well as the carrier gas flow rate, on the spheroidization rate of silica powders, were investigated. The prepared silica powders before and after plasma treatment were examined by scanning electron microscopy, X-ray diffraction, and laser granulometric analysis. Results indicated that the average size of the silica particles increased, and the transformation of crystals into the amorphous state occurred after plasma treatment. Discharge image processing was employed to analyze the effect of the plasma temperature field on the spheroidization rate. The spheroidization rate of the silica powder increased with the increase of the hydrogen content in the sheath gas. On the other hand, the spheroidization rate of the silica power first increased and then decreased with the increase of the nitrogen content in the sheath gas. Moreover, the amorphous content increased with the increase of the spheroidization rate of the silica powder. 相似文献
967.
利用左(右)振动 N—S 玻色弦(四维费米弦)模式的相互作用顶角,我们给出了四维杂化弦的相互作用顶角.它具有[SU(2)]规范不变性. 相似文献
968.
野蚕DHPBAN基因启动子的克隆及序列分析 总被引:1,自引:0,他引:1
为研究昆虫滞育激素性信息素合成激活肽基因在进化过程中的变化以及基因表达调控的异同,用PCR方法克隆了野蚕的DHPBAN基因的启动子并测序,这是第二个被克隆的昆虫DHPBAN基因启动子.与家蚕相比,在核苷酸水平上同源性达94%.野蚕DHPBAN基因启动子的TATA框的保守序列为TATATAAA,位于-47—-40处;CAAT框是GGCCCATCT,位于-83—-75处;野蚕与家蚕一样具有TAAT保守序列,这段序列是一类调控蛋白的结合核心位点,家蚕的位于-185—-176,野蚕的位于-176—-167.在-64—-56部位,核苷酸序列表现出较大的不同. 相似文献
969.
光泵亚毫米波激光的交流斯塔克效应的进一步探讨 总被引:1,自引:0,他引:1
本文取消了过去使用的假设,考虑工作气体分子可以近似为六能级系统.在求解系统的密度矩阵方程的基础上,再用迭代运算法直接计算激光器样品管内各点的亚毫米波激光的功率密度,可得亚毫米波激光的输出功率密度与样品管长的关系及一组表示不同样品管长条件下,亚毫米波激光的输出波谱特性. 相似文献
970.
在小测度集上用小Riemann和刻划了Lebsgue积分和Henstock积分的实质. 相似文献