全文获取类型
收费全文 | 19482篇 |
免费 | 1107篇 |
国内免费 | 1586篇 |
专业分类
电工技术 | 202篇 |
综合类 | 903篇 |
化学工业 | 2290篇 |
金属工艺 | 8522篇 |
机械仪表 | 753篇 |
建筑科学 | 67篇 |
矿业工程 | 250篇 |
能源动力 | 593篇 |
轻工业 | 69篇 |
水利工程 | 3篇 |
石油天然气 | 240篇 |
武器工业 | 265篇 |
无线电 | 751篇 |
一般工业技术 | 5168篇 |
冶金工业 | 1668篇 |
原子能技术 | 196篇 |
自动化技术 | 235篇 |
出版年
2024年 | 21篇 |
2023年 | 374篇 |
2022年 | 416篇 |
2021年 | 618篇 |
2020年 | 629篇 |
2019年 | 585篇 |
2018年 | 490篇 |
2017年 | 608篇 |
2016年 | 480篇 |
2015年 | 540篇 |
2014年 | 770篇 |
2013年 | 1190篇 |
2012年 | 900篇 |
2011年 | 1480篇 |
2010年 | 961篇 |
2009年 | 1167篇 |
2008年 | 1014篇 |
2007年 | 1224篇 |
2006年 | 1183篇 |
2005年 | 900篇 |
2004年 | 917篇 |
2003年 | 837篇 |
2002年 | 745篇 |
2001年 | 672篇 |
2000年 | 625篇 |
1999年 | 544篇 |
1998年 | 394篇 |
1997年 | 403篇 |
1996年 | 301篇 |
1995年 | 223篇 |
1994年 | 201篇 |
1993年 | 152篇 |
1992年 | 140篇 |
1991年 | 72篇 |
1990年 | 84篇 |
1989年 | 60篇 |
1988年 | 31篇 |
1987年 | 31篇 |
1986年 | 34篇 |
1985年 | 17篇 |
1984年 | 24篇 |
1983年 | 20篇 |
1982年 | 21篇 |
1981年 | 17篇 |
1980年 | 14篇 |
1979年 | 9篇 |
1978年 | 14篇 |
1977年 | 6篇 |
1976年 | 7篇 |
1975年 | 7篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
超临界二氧化碳是一种特殊的流体,具有粘度低、扩散系数大、密度大和溶解性较好等特点,因此被认为是第四代核反应堆能量传递的首选材料。由于核反应堆的工作环境十分苛刻,超临界二氧化碳应用于核反应堆系统中易造成材料腐蚀,为确保核反应堆安全有效地运行,对超临界二氧化碳腐蚀行为进行系统研究,介绍了核反应堆的发展历程,重点探讨超临界二氧化碳对合金材料腐蚀的机理,详细阐述了温度、压力、杂质和流速等因素对材料在超临界二氧化碳中腐蚀行为的影响,针对目前的研究提出了亟待解决的问题。 相似文献
2.
采用铸造法制备原位自生亚共晶Al-10Mg2Si复合材料,研究Cu和T6热处理对该复合材料组织与力学性能的影响。结果表明:适量Cu的添加能显著减小共晶Mg2Si相晶粒尺寸,使其晶体结构由粗大的长条状和汉字状转变为细小的条状和纤维状;同时使针状的β-Al5Fe Si相转变为细小的不规则富Cu颗粒。经T6热处理后,质量分数为1.5%的Cu复合材料中的共晶Mg2Si相完全球化。质量分数为1.5%的Cu添加同时提高了材料铸态下的抗拉强度(Rm)、屈服强度(Rp0.2)和伸长率(A),达317、169 MPa和2.3%,比未添加Cu提高了42.2%、24.3%和53.3%;经T6热处理的Rm和Rp0.2值分别增至332、181 MPa,而A值保持不变。同时,材料由脆性断裂完全转变为韧性断裂。 相似文献
3.
Intermetallic materials are bestowed by diverse ordered superlattice structures together with many unusual properties. In particular, the advent of chemically complex intermetallic alloys (CCIMAs) has received considerable attention in recent years and offers a new paradigm to develop novel metallic materials for advanced structural applications. These newly emerged CCIMAs exhibit synergistic modulations of structural and chemical features, such as self-assembled long-range close-packed ordering, complex sublattice occupancy, and interfacial disordered nanoscale layer, potentially allowing for superb physical and mechanical properties that are unmatched in conventional metallic materials. In this paper, we critically review the historical developments and recent advances in ordered intermetallic materials from the simple binary to chemically complex alloy systems. We are focused on the unique multicomponent superlattice microstructures, nanoscale grain-boundary segregation, and disordering, as well as the various extraordinary mechanical and functional properties of these newly developed CCIMAs. Finally, perspectives on the future research orientation, challenges, and opportunities of this new frontier are provided. 相似文献
4.
《Ceramics International》2022,48(7):9124-9133
The main obstacles in lithium-ion battery are limited by rate performance and the rapid capacity fading of LiNi0.8Co0.1Mn0.1O2 (NCM811). Herein, a novel three-dimensional (3D) hierarchical coating material has been fabricated by in situ growing carbon nanotubes (CNTs) on the surfaces of Ni–Al double oxide (Ni–Al-LDO) sheets (named as LDO&CNT) with Ni–Al double hydroxide (Ni–Al-LDH) as both the substrate and catalyst precursor. The resultant LDO&CNT nanocomposites are uniformly coated on the surfaces of NCM811 by the physical mixing method. The rate capability of the resultant cathode material retains to 78.80% at a current rate of 3C. Its capacity retention increases by 6.7–14.42% compared with pristine NCM811 after 100 cycles within a potential range of 2.75–4.3 V at 0.5C. The improved rate capability and cycle performance of NCM811 are assigned to the synergistic effects between Ni–Al-LDO and CNTs. The hierarchical LDO&CNT nanocomposites coating on the surface of NCM811 avoids the aggregation of conductive CNTs and the stacking of Ni–Al-LDO nanosheets. Furthermore, it accelerates Li+ and electrons shuttle and reduces the reaction of Li2O with H2O and CO2 in air, which results in Li2CO3 and LiOH alkali formation on the NCM811 surface. 相似文献
5.
摘要:铝碳耐火材料是冶金连铸、铁水包、中间包等部位常用的耐火材料,因其使用环境恶劣,对强度、抗热震性、抗渣侵蚀性等各项性能的要求都较高。优化铝碳耐火材料的力学性能能降低因机械应力引发的物理损毁和热应力引发的热震损毁,直接影响使用寿命。优化耐火材料的原料是易实现且高效的研究方向。从制备铝碳耐火材料的3种原料出发,分别从催化改性结合剂、添加纳米碳源和使用高效添加剂3个角度介绍了铝碳耐火材料力学性能优化的研究进展。最后对利于铝碳耐火材料工业化生产的研究方向进行了建议和展望。 相似文献
6.
采用粉末冶金技术制备了SiCp/Al复合材料,探讨了SiC颗粒质量分数对SiCp/Al复合材料密度、布氏硬度、微观形貌以及摩擦磨损性能的影响。结果表明,SiC颗粒表面形成了少量可提高界面结合性的Al4C3化合物。随着SiC质量分数增加,SiCp/Al复合材料的密度没有明显的变化,当SiC质量分数增加至25%时,密度明显下降。SiCp/Al复合材料的布氏硬度随着SiC质量分数的增加呈先增长后减小的变化趋势。当SiC质量分数为20%时,材料的硬度最优(HBW 114),平均摩擦系数达到最大值(0.3425),摩擦后试样表面形貌平整且犁沟较浅,SiC颗粒未出现明显剥落。 相似文献
7.
《中国稀土学报(英文版)》2022,40(3):467-472
RM3 compounds (R = rare earth metals, M = transition metals) have rarely been studied for gaseous hydrogen storage applications because of unfavorable thermodynamics. In this work, the hydrogen storage properties of a single-phase YFe3 alloy were improved by non-stoichiometric composition and alloying with Sc and Zr. Only the Y1.1–yScyFe3 (y = 0.22, 0.33) alloys consist of a single rhombohedral phase. The Sc substitution for Y leads to the reduction in the unit cell volume of the YFe3 phase, and thus significantly increases the dehydriding equilibrium pressure and decreases the dehydrogenation temperature. The alloy Y0.77Sc0.33Fe3 delivers a decomposition enthalpy change of 33.54 kJ/mol and a lowest dehydrogenation temperature of 135 °C, in comparison with 38.99 kJ/mol and 165 °C for the alloy Y1.1Fe3. The Zr substitution causes a similar thermodynamic destabilization effect, but the composition and microstructure of Y–Zr–Fe alloys need to be further optimized. 相似文献
8.
《中国稀土学报(英文版)》2022,40(4):636-644
In this paper, a series of Rh/CeO2 catalysts with three-dimensional porous nanorod frameworks and large specific surface area were prepared by chemical dealloying Al–Ce–Rh precursor alloys and then calcining in pure O2. The effects of the Rh content and calcination temperature on CO oxidation and CH4 combustion were studied, and the results reveal that the Rh/CeO2 catalysts produced by dealloying melt-spun Al91.3Ce8Rh0.7 alloy ribbons and then calcining at 500 °C exhibit the best catalytic activity, the reaction temperatures for the complete conversion of CO and CH4 are as low as 90 and 400 °C, respectively. Furthermore, after 150 h of continuous testing at high concentrations of H2O and CO2, the nature of the catalyst is not irreversibly destroyed and can still return to its initial level of activity. This excellent catalytic activity is attributed to a portion of Rh being uniformly distributed on the CeO2 nanorod surface in the form of nanoparticles, forming strong Rh–CeO2 interfacial synergy. Another portion of Rh permeated into the CeO2 lattice, which results in a significant increase in the number of oxygen vacancies in CeO2, thus allowing more surface active oxygen to be adsorbed and converted from the gas phase. Moreover, the catalytic reaction can proceed even in an oxygen-free environment due to the excellent oxygen storage performance of the Rh/CeO2 catalyst. 相似文献
9.
10.
以浇注HMX 基含铝炸药为研究对象,构建炸药爆轰加载假设模型。探讨爆热与破片速度的关系,并使用
不同粒径设计了不同铝含量的炸药配方,测试了炸药爆速和爆热及其对全预制破片速度和穿甲率的影响。试验结果
表明:随着铝氧比和爆热的增加,破片速度和穿甲率呈现先升后降的趋势,当铝氧比和爆热分别为0.35 和6 200 kJ/kg
时,其破片速度和穿甲率分别为1 890 m/s 和89%,破片加载能力达到最大,验证了含铝炸药爆热与破片加载特性存
在数学极值关系,工程上存在最佳匹配点。 相似文献