全文获取类型
收费全文 | 12903篇 |
免费 | 1362篇 |
国内免费 | 1023篇 |
专业分类
电工技术 | 408篇 |
综合类 | 1421篇 |
化学工业 | 1562篇 |
金属工艺 | 971篇 |
机械仪表 | 873篇 |
建筑科学 | 3352篇 |
矿业工程 | 689篇 |
能源动力 | 371篇 |
轻工业 | 244篇 |
水利工程 | 402篇 |
石油天然气 | 428篇 |
武器工业 | 182篇 |
无线电 | 806篇 |
一般工业技术 | 2318篇 |
冶金工业 | 279篇 |
原子能技术 | 137篇 |
自动化技术 | 845篇 |
出版年
2024年 | 27篇 |
2023年 | 175篇 |
2022年 | 302篇 |
2021年 | 414篇 |
2020年 | 472篇 |
2019年 | 424篇 |
2018年 | 388篇 |
2017年 | 504篇 |
2016年 | 515篇 |
2015年 | 516篇 |
2014年 | 746篇 |
2013年 | 838篇 |
2012年 | 989篇 |
2011年 | 1104篇 |
2010年 | 826篇 |
2009年 | 850篇 |
2008年 | 787篇 |
2007年 | 839篇 |
2006年 | 795篇 |
2005年 | 663篇 |
2004年 | 484篇 |
2003年 | 423篇 |
2002年 | 385篇 |
2001年 | 292篇 |
2000年 | 231篇 |
1999年 | 197篇 |
1998年 | 211篇 |
1997年 | 150篇 |
1996年 | 140篇 |
1995年 | 108篇 |
1994年 | 104篇 |
1993年 | 66篇 |
1992年 | 50篇 |
1991年 | 42篇 |
1990年 | 39篇 |
1989年 | 30篇 |
1988年 | 31篇 |
1987年 | 14篇 |
1986年 | 18篇 |
1985年 | 20篇 |
1984年 | 17篇 |
1983年 | 12篇 |
1982年 | 12篇 |
1981年 | 7篇 |
1980年 | 12篇 |
1979年 | 6篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1959年 | 2篇 |
1951年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
51.
ABSTRACTIn the present paper, the mechanical properties and the scratch failure mechanisms of Ni–P electroless coatings are described. The material microstructure was studied in as-deposited and annealed conditions through SEM and EDS analyses. Nanoindentation measurements on the coatings showed a remarkable hardening due to the crystallization and precipitation behaviour produced by annealing. The scratch tests, conducted by increasing the load during scratch, revealed the coating failure mechanisms in a broad range of applied stresses up to delamination. 相似文献
52.
《International Journal of Hydrogen Energy》2022,47(2):809-819
The influence of Ni-hydrotalcite (HT) loading on the activity and stability of Ni-HT supported on activated carbon (Ni-HT/AC) was investigated for fermentative hydrogen production. The basic sites of Ni-HT loading on AC support significantly boosted the catalytic performance with the initial faster rate. The combined function catalyst of Ni-HT/AC facilitates the rapid decomposition of saccharides and high selectivity to fructose that attained the maximum hydrogen production within 24 h. The optimum dose of Ni-HT/AC at 8.33 g/L showed a 25.84% increment over the control. In addition, shortening the lagging phase time at 1.50 h was achieved. The high adsorption capacity of lactic acid was induced with the basic sites of Ni-HT/AC. However, a deactivation of the Ni-HT/AC during prolonged fermentation was associated with metabolites formation, causing the leaching of Mg2+ ions from the surface of AC supported Ni-HT and reducing surface basicity of Ni-HT/AC. 相似文献
53.
The cycloaddition of CO2 to epoxides represents a green efficient method to form bis(cyclic carbonate)s. The main purpose of the work reported in this paper was to examine the effect of the gas flow rate (20, 40, 60 and 100 mL min–1) during carbonation on the conversion yield, chemical structure, rheological behaviour and thermal properties of the prepared compounds. A series of new bis(cyclic carbonate)s was obtained from bio‐based polyether polyol. The syntheses were performed in the absence of toxic solvents and the process did not require the use of elevated pressure. The progressive structural changes and the presence of characteristic chemical groups were monitored by attenuated total reflection Fourier transform infrared spectroscopy. The characterization of the structure by 1H NMR and 13C NMR also confirmed the formation of cyclic carbonate moieties. The non‐Newtonian behaviour and the optimal mathematical model (Herschel–Bulkley) were verified by rheological measurements. The materials obtained could be used as a chemical intermediate to synthesize advanced materials based upon polyurethanes without using isocyanates. © 2019 Society of Chemical Industry 相似文献
54.
Poornesh K. Koorata Santoshkumar D. Bhat 《International Journal of Hydrogen Energy》2021,46(7):5570-5579
The fuel cell gas diffusion media (GDM) is a highly porous carbon-fiber-reinforced thin composite layer. The experimental response of these materials is observed to be highly nonlinear at low-stress levels. The cyclic mechanical response of GDM is investigated in terms of stiffness and damage parameters. The prediction of the state of deformation in GDM is vital in relating GDM's properties to ohmic and transport losses. To this end, a compressible form of the phenomenological model is proposed to capture the experimental cyclic response accurately. The model is constituent dependent; that is, the cumulative cyclic stress-strain response of GDM is a function of individual constituent phases present in the material. These individual constituents are porous matrix and reinforced fibers. The model hence derived for a typical GDM material, can predict residual strain, hysteresis, and damage quotient associated with the stress softening. This advanced model is implemented in the numerical domain to evaluate the response of the polymer electrolyte fuel cell (PEFC) unit cell. The stress-strain distribution fields are analyzed and compared with those of conventional GDM models. The results point to a remarkable deviation from the conventional notion of structural analysis. 相似文献
55.
Dr. Dae-Shik Kim Dr. Atsushi Endo Dr. Francis G. Fang Dr. Kuan-Chun Huang Dr. Xingfeng Bao Dr. Hyeong-wook Choi Dr. Utpal Majumder Dr. Young Y. Shen Steven Mathieu Xiaojie Zhu Kristen Sanders Dr. Thomas Noland Dr. Ming-Hong Hao Dr. Yu Chen Dr. John Y. Wang So Yasui Karen TenDyke Jiayi Wu Christy Ingersoll Kara A. Loiacono Dr. Janna E. Hutz Dr. Nadeem Sarwar 《ChemMedChem》2021,16(11):1741-1744
A strategy for creating potent and pan-genotypic stimulator of interferon genes (STING) agonists is described. Locking a bioactive U-shaped conformation of cyclic dinucleotides by introducing a transannular macrocyclic bridge between the nucleic acid bases leads to a topologically novel macrocycle-bridged STING agonist (MBSA). In addition to substantially enhanced potency, the newly designed MBSAs, exemplified by clinical candidate E7766 , exhibit broad pan-genotypic activity in all major human STING variants. E7766 is shown to have potent antitumor activity with long lasting immune memory response in a mouse liver metastatic tumor model. Two complementary stereoselective synthetic routes to E7766 are also described. 相似文献
56.
《Advanced Powder Technology》2022,33(2):103409
A novel approach for preparing drug-containing particles (DCPs) with controlled size distribution and high drug loading was developed using melt granulation. This approach comprises two steps. First, melting component adsorbed particles (MAs) were prepared by mixing and heating the melting components with a porous carrier using a high shear granulator. Second, DCPs were prepared by layering the drug on MAs using a fluidized bed rotor granulator. The time taken for both steps was within 30 min. Adding the polymer in the second step remarkably increased the viscosity of the mixture of melting components and the polymer. Therefore, DCPs could be successfully loaded with a high amount of drug (70% w/w). The particle size distribution of the DCPs was narrow, and it depended on that of the MAs. The flowability of the DCPs was excellent, and the sphericity was close to 1. A unique particle formulation mechanism was suggested based on the observation of DCPs using scanning electron microscopy. The manufacturing time and DCP characteristics were not affected by the manufacturing scale. In conclusion, we have successfully developed a highly efficient novel approach for preparing optimal DCPs through melt granulation, named “Melt Adsorption and Layering with Porosity Core” (MALCORE®). 相似文献
57.
《Ceramics International》2022,48(5):6266-6276
Porous diatomite ceramics with hierarchical pores and high apparent porosity (50.29–56%) were successfully fabricated via direct stereolithography. The pre-ball-milling time, dispersant type and dispersant concentration were systematically investigated to prepare diatomite pastes with high solid loading, low viscosity and a self-supporting effect. The results showed that a pre-ball-milling time of 24 h was more suitable to prepare diatomite pastes with high solid loading, and Span80 at 2 wt% was the optimal dispersant to obtain 40 vol% diatomite paste with a low viscosity and a self-supporting effect. To restrain the formation of defects, a heating rate as low as 0.2 °C/min was allowed to control the pyrolysis rate in the multistage debinding process. At sintering temperatures ranging from 900 °C to 1000 °C, porous diatomite ceramics exhibited a typical bimodal porosity, high apparent porosity and great flexural strength. 相似文献
58.
59.
Polyurethane (PUR) foam materials are widely used as cores in sandwich composites, for packing and cushioning. They are made of interconnected networks of solid struts and cell walls incorporating voids with entrapped gas. The main characteristics of foams are lightweight, high porosity, high crushability, and good energy absorption capacity. Fracture toughness in mixed mode loading is of particular interest because foam cracking weakens the structure’s capacity for carrying loads.Present paper assesses the shear elastic (shear modulus) and mechanical (shear strength) properties of polyurethane foams. Also, three different types of specimens were used to determine mode I and mode II fracture toughness. The shear modulus, shear strength and fracture toughness increases with increasing foam density. Also the effect of loading direction and loading speed is investigated. The authors propose a micromechanical model to estimate fracture toughness based on the tensile strength of the solid material and the topology of the cellular structure. 相似文献
60.
If all components in a nanoindentation system are well calibrated and a reference material has unique hardness, H and reduced modulus, Er independent of the indentation depths, the load, L and the penetration depth, h in the indentation loading curve of the reference material can be correlated by L=Kh2. Here the constant K is expressed by H, Er and indenter geometry constants. By using H and Er of a fused silica and the Berkovich geometry, an analytical expression for the indentation loading curve could be derived. To compare with this analytical loading curve, experimental indentation data were measured with two commercial nanoindenters. The experimental loading curves shifted leftward or rightward from the analytical loading curve and this depth deviation was attributed to improper calibration of the nanoindenters. Quantitative calibrations of frame compliance and indenter bluntness were tried for the raw nanoindentation data and this resulted in consistent nanoindentation data regardless of the used nanoindenters. 相似文献