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841.
Microarc oxidation(MAO)electrolysis plasma deposition was used to prepare Al_2O_3coatings on Ti-45Al-8.5 Nb alloys to improve high temperature oxidation resistance.The surface and cross-section morphologies before and after high-temperature oxidation,the chemical composition,and the phase identification of the coatings were investigated by scanning electron microscopy(SEM),electron probe microanalyses(EPMA),and X-ray diffraction(XRD).The results show that Al_2O_3coatings with a thickness of approximately 8μm can be obtained on the Ti-45Al-8.5 Nb alloys by MAO for 600 s.The samples with the Al_2O_3coatings exhibited better high-temperature oxidation resistance.A minimal weight gain of only 0.396 g/m~2after 100 h oxidation at 900°C was observed for the coatings formed with a deposition voltage of 400 V and using a duty cycle of 3%.The deposition mechanism of the Al_2O_3coatings and the effect of the MAO parameters are also described. 相似文献
842.
The as-cast and heat-treated microstructures and mechanical properties of the AZ91 magnesium alloys with and without minor Sc addition were investigated and compared in this paper. The results indicated that adding0.15–0.45 wt% Sc to the as-cast AZ91 alloy not only could modify and refine the Mg_(17)Al_(12) phase but also suppress the formation of the Mg_(17)Al_(12) phase. At the same time, the grains of the Sc-containing as-cast AZ91 alloys were also effectively refined. As a result, the mechanical properties at room temperature(RT) for the Sccontaining as-cast AZ91 alloys were effectively improved. In addition, adding 0.15–0.45 wt%Sc to the AZ91 alloy promoted the formation of the continuous precipitates(CP) during the aging treatment in spite of that the formation of the discontinuous precipitates(DP) was simultaneously suppressed. Accordingly, the Sc-containing as-aged AZ91 alloys obtained the relatively higher mechanical properties at RT than the as-aged AZ91 alloy. 相似文献
843.
Yunsong Zhao Chenguang Liu Yuanyuan Guo Yanfei Liu Jian Zhang Yushi Luo Dingzhong Tang 《自然科学进展(英文版)》2018,28(4):483-488
Boron is added into single crystal superalloys as a micro-alloying element to strengthen low angle grain boundaries.However,systematic investigations on the effect of boron on microstructures of single crystal superalloys are limitedly reported.The effect of boron on as-cast and heat-treated microstructures was investigated in two experimental Ni-based single crystal superalloys containing 3 wt% Re.The current results indicated that the volume fraction of(γ+γ′)eutectic and M_3B_2 borides was evidently increased,while the number of micropores was evidently decreased with the addition of 0.02 wt% boron.The(γ+γ′)eutectic could not be dissolved completely due to the lower incipient melting temperature caused by the formation of M_3B_2 borides.Meanwhile,the M_3B_2 borides were found to be enriched with indispensable strengthening elements Cr,Mo,W and Re,and this may lower the strengthening effect and cause stress concentration during high temperature creep. 相似文献
844.
The hydrogen storage of(TiZr_(0.1))_xCr_(1.7-y)Fe_yMn_(0.3)(1.05x1.2,0.2y0.6)alloys,prepared by Ar plasma arc melting,were investigated by X-ray diffraction,pressure-composition-temperature(PCT).The results indicated that all(TiZr_(0.1))_xCr_(1.7-y)Fe_yMn_(0.3)(1.05≤x≤1.2,0.2≤y≤0.6)alloys were determined as C14-type Laves phase,the cell parameters a,c and unit cell volume of(TiZr_(0.1))xCr_(1.1)Fe_(0.6)Mn_(0.3)(1.05≤x≤1.2)alloys increased with increasing the(TiZr)super-stoichiometry from 1.05 to 1.2,and the value of a/c almost unchanged.The hydrogen absorption and desorption plateau pressure decreased from 5.6,4.4–2.6,2.2 MPa with the increase of(TiZr)super-stoichiometry from 1.05 to1.2 at 274 K respectively,and the hydrogen desorption plateau pressure decline was not obvious when the(TiZr)super-stoichiometry exceeded 1.15.The(TiZr_(0.1))_(1.1)Cr_(1.1)Fe_(0.6)Mn_(0.3)alloy had the best comprehensive properties about the maximum and reversible hydrogen storage capacity was 1.79 and 1.45 wt%respectively.The cell parameters a,c and unit cell volume of(TiZr_(0.1))_(1.1)Cr_(1.7-y)Fe_yMn_(0.3)(0.2≤y≤0.6)alloys increased as the ratio of Fe/Cr content decreased.The hydrogenation and dehydrogenation plateau pressure decreased from 4.5,3.4–1.0,0.9 MPa respectively and the maximum hydrogen storage capacity increased from 1.79 to 2.0 wt%as the Fe content reduced from 0.6 to 0.2 at274 K.The maximum and the reversible hydrogen storage capacity were about 2.0 and 1.65 wt%as the ratio of Fe/Cr was 0.13(ie,(TiZr_(0.1))_(1.1)Cr_(1.5)Fe_(0.2)Mn_(0.3)alloy),its relative molar enthalpy of dissociation hydrogen was24.30 kJ/mol H_2. 相似文献
845.
Selective functionalization of mesoporous silica nanospheres (MSNs) is crucial for nanoengineering of MSNs.
Herein, we have combined “surface-protected etching strategy” and “cationic surfactant assisted etching
strategy” to prepare functionalized MSNs with externally attached amino groups. The externally attached NH2
groups endow the catalysts with excellent catalytic performance for nitroaldol reaction between nitromethane
and benzaldehyde. In addition, those NH2-MSNs can also be used to support gold nanoparticles, which display
very good catalytic performance for reduction of 4-nitrophenol. It can be envisioned that the synthesis protocol
developed in this work could also be extended to nanoengineered MSNs, which provides opportunities for nanoreactors
design. 相似文献
846.
This paper reports the ferroelectricity in antiferromagnetic SmCrO_3 with a reasonably large value of spontaneous electric polarization(70μC/cm~2mC cm~(-2)at 50 K)based on the measurement of pyroelectric current.The experimental results showed that the temperature of the onset of polar order was evidently higher(about220 K)than the Neel temperature(T_N=197 K)in the magnetodielectric studies.The calculated magnetodielectric effect(MDE)value was explicitly negative with maximum|MDE|values of about 3.6%around 230 K.The absence of a convincing signature in MDE at antiferromagnetic ordering temperature T_Nindicated the absence of magnetoelectric coupling around this temperature regime.The results further confirmed that the onset of polar order can be attributed to the structural distortion,rather than the canted noncollinear magnetic structure. 相似文献
847.
The relationship between crystal orientations and meso-mechanical properties of β phase Ti-7333 titanium was investigated through the combination of nanoindentation experiments and simulation. The crystal plasticity finite element(CPFE) model for nanoindentation of single body-centered cubic crystal was established based on the experimental data. And the crystal plasticity constitutive law was implemented to simulate the nanoindentation process, obtaining satisfied results with an acceptable error. From the simulated pileup morphology patterns with different crystal orientations, it was found that the β phase experienced a symmetrical and orientation-related deformation process. Meanwhile, the strain-rate sensitivity(SRS) of β phase was investigated through nanoindentation tests based on continuous stiffness measurement(CSM) under different strain rates,varying between 0.2, 0.05 and 0.01 s~(-1). Two grains with different orientations exhibited similar SRS exponents,m, calculated from the experimental results. 相似文献
848.
The low quantum efficiency arising from poor charges transfer and insufficient light absorption is one of the critical challenges toward achieving highly efficient water splitting in photoelectrochemical cells. Three dimensions(3D) structures and heterojunctions have received intensive research interests recent years due to their excellent ability to separate photo-generated charges as well as the enhanced light harvesting property. Herein,3 D Cu O/WO_3 structure was fabricated through a facile solvothermal method followed by chemical bath deposition. The loading of Cu O clusters on WO_3 nanoflake arrays results in a much improved photocurrent density compared with that of pristine WO_3 nanoflake arrays, which reaches 1.8 m A/cm2 at 1.23 V vs. the reversible hydrogen electrode. The electrochemical impedance spectroscopy measurement demonstrates that the improved performance of Cu O/WO_3 electrode is attributed to the accelerated charge transfer kinetics as a result of the desirable band alignment in Cu O/WO_3 heterojunction. This work demonstrates a facile strategy to construct superior WO_3 electrode, which will ultimately allow for efficient storage of solar energy into hydrogen. 相似文献
849.
Yan M Zhaoxin Du Xiaoming Cui Jun Cheng Guolong Liu Tianhao Gong Huimin Liu Xiaopeng Wang Yuyong Chen 《自然科学进展(英文版)》2018,28(6):711-717
The microstructure and mechanical properties of Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe high strength titanium alloy sheets prepared by unidirectional cold rolling and two-step cross cold rolling were investigated. Results showed that the β phase grains were refined significantly by cold rolling followed by solution treatment for a short time.Compared to unidirectional cold rolling, the short time solution treatment after two-step cross rolling could significantly reduce the non-uniformity of the microstructure of the alloy sheets. After aging treatment at 550 ℃,the anisotropy of the mechanical properties still existed in the unidirectional rolled sheets, and the tensile strength was highest along the rolling direction. After solution and aging treatment, the anisotropy of the mechanical properties of the two-step cross rolling process sheet was not obvious than unidirectional cold rolling,and alloy had good strength and plasticity matching. 相似文献
850.
Bangshao Dong Shaoxiong Zhou Jingyu Qin Ying Li Hui Chen Yanguo Wang 《自然科学进展(英文版)》2018,28(6):696-703
The evolution of liquid metal at high temperature is known much less than their solid states. This is partially due to that the message concerning clusters, metastable phase or heterogeneity in liquid is usually too slight to be traced. Here, we shed some light on the nature of structural evolution of Fe-based glass-forming alloy during overheating process by the investigation of high-temperature melt viscometry and first principles simulations. It was found that a structural transition around 1400 ℃ occurred in the melts of initial homogeneous ingot, heterogeneous ingot and amorphous ribbons jointly, and was confirmed by the results from differential scanning calorimeter(DSC), and ab initio molecular dynamics(AIMD). Combining these results with Fe-Si-B ternary phase diagram and the melting characteristics of Fe-B compounds, it is safe to conclude that the disintegration of Fe_2B type clusters to Fe_3B-type clusters leads to the observed transition. These results offer a significant reference for the preparation and property control of Fe-based amorphous alloys. 相似文献