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51.
52.
分析壳聚糖棒材在湿态环境下力学性能衰减速率过快的原因,通过对植物叶拒水机理的仿生,将壳聚糖表面进行复合式仿生疏水改性.先对壳聚糖棒材表面进行酰化改性,降低了棒材表面极性,使棒材表面形成一种微观凹凸的粗糙结构.然后在此粗糙结构上进行生物酯涂覆,以达到仿植物叶的拒水效果.结果表明,壳聚糖棒材表面经过乙酰化处理,表面变得粗糙.经接触角实验和吸水速率测试表明,壳聚糖棒材表面经酰化改性后,降低了材料表面的极性及亲水性.通过控制酰化反应时间,能有效地增大棒材的接触角,使得最外层的生物酯涂层紧密结合,经模拟体液浸泡实验,该材料3个月内完全拒水,达到了预期的目的. 相似文献
53.
本文对近5年来有机/无机复合骨修复材料研究领域的进展进行了综述,根据材料组分的特点分析其在生物相容性、生物降解性、生物活性以及力学性能等方面的优缺点,同时探讨了目前骨修复材料领域存在的问题,并对今后人工骨替代材料的发展趋势作出了展望。 相似文献
54.
Stability, internal modes and internal oscillation of 12-pearled necklace solitons in photorefractive crystal with imprinted Bessel photonic lattices are investigated. It is shown that the imaginary parts of internal modes are negligible comparing with real parts. The stable solitons perform long-distance and quasi-periodic oscillation of intensity and shape under the perturbation of internal modes. 相似文献
55.
Thorsten Kattelans Wilhelm Heinrichs 《Journal of Computational and Applied Mathematics》2011,236(6):1193-1215
From the literature, it is known that the Least-Squares Spectral Element Method (LSSEM) for the stationary Stokes equations performs poorly with respect to mass conservation but compensates this lack by a superior conservation of momentum. Furthermore, it is known that the Least-Squares Spectral Collocation Method (LSSCM) leads to superior conservation of mass and momentum for the stationary Stokes equations. In the present paper, we consider mass and momentum conservation of the LSSCM for time-dependent Stokes and Navier-Stokes equations. We observe that the LSSCM leads to improved conservation of mass (and momentum) for these problems. Furthermore, the LSSCM leads to the well-known time-dependent profiles for the velocity and the pressure profiles. To obtain these results, we use only a few elements, each with high polynomial degree, avoid normal equations for solving the overdetermined linear systems of equations and introduce the Clenshaw-Curtis quadrature rule for imposing the average pressure to be zero. Furthermore, we combined the transformation of Gordon and Hall (transfinite mapping) with the least-squares spectral collocation scheme to discretize the internal flow problems. 相似文献
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A. B. El-Bediwi 《辐射效应与固体损伤》2013,168(8-9):539-542
The elastic modulus, internal friction and stiffness values of quenched SnSb bearing alloy have been evaluated using the dynamic resonance technique. Annealing for 2 and 4 h at 120, 140 and 160 °C caused variations in the elastic modulus, internal friction and stiffness values. This is due to structural changes in the SnSb matrix during isothermal annealing such as coarsening in the phases (Sn, Sb or intermetallic compounds), recrystallization and stress relief. In addition, adding a small amount (1 wt.%) of Cu or Ag improved the bearing mechanical properties of the SnSb bearing alloy. The SnSbCu1 alloy has the best bearing mechanical properties with thermo-mechanical stability for long time at high temperature. 相似文献
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59.
D. Gerhard A. Hellweg I. Merke W. Stahl M. Baudelet D. Petitprez G. Wlodarczak 《Journal of Molecular Spectroscopy》2003,220(2):234-241
The microwave spectrum of o-chlorotoluene has been reinvestigated using molecular beam Fourier transform microwave (MB-FTMW) spectrometers in the frequency range of 4–23 GHz. Due to the high resolution of this molecular beam technique the analysis yielded improved rotational constants, centrifugal distortion constants, and, for the first time, the complete chlorine nuclear quadrupole coupling tensor. From the torsional fine structure the barrier to internal rotation of the methyl group was found to be 5.5798(52) kJ mol−1. Experimental results and ab initio calculations are compared. 相似文献
60.
Yoshio Tatamitani Akinori Sato Yoshiyuki Kawashima Nobukimi Ohashi James M. LoBue Eizi Hirota 《Journal of Molecular Spectroscopy》2009,257(1):11-19
The rotational spectra of three isotopomers of the Ar–dimethyl sulfide (DMS) complex – normal, 34S, and 13C species – were measured in the frequency region from 3.7 up to 24.1 GHz by Fourier transform microwave spectroscopy. The normal species yielded 43 a-type and 79 c-type transitions. No Ar tunneling splitting was observed, while many transitions were split by the internal rotation of the two methyl tops of the DMS unit. In cases where the K-type splitting was close to that due to methyl internal-rotation, several forbidden transitions were observed that followed b-type selection rules. All of the observed transition frequencies were analyzed simultaneously using a phenomenological Hamiltonian also used in previously published work describing the Ar–dimethyl ether (DME) and Ne–DME complexes. The rotational and centrifugal distortion constants and the potential barrier height to methyl-top internal rotation, V3, were determined. The rotational constants were consistent with an Ar–DMS center of mass (cm) distance of 3.796 (3) Å and a S–cm–Ar angle of 104.8 (2)°. The V3 potential barrier obtained, 736.17 (32) cm−1, was 97.8% of the DMS monomer barrier. By assuming a Lennard–Jones-type potential, the dissociation energy was estimated to be 2.4 kJ mol−1, which was close to the value for Ar–DME, 2.5 kJ mol−1. 相似文献