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排序方式: 共有139条查询结果,搜索用时 390 毫秒
31.
Gezer Bahdisen Kose Utku Zubov Dmytro Deperlioglu Omer Vasant Pandian 《Wireless Networks》2020,26(8):5665-5679
Wireless Networks - In this study, effective and fast removal efficiency of carob powder (as an absorbent material from liquid phase) was investigated by focusing on the dangerous paint methylene... 相似文献
32.
High‐temperature strength and plastic deformation behavior of niobium diboride consolidated by spark plasma sintering
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Dmytro Demirskyi Ievgen Solodkyi Toshiyuki Nishimura Oleg Vasylkiv 《Journal of the American Ceramic Society》2017,100(11):5295-5305
Bulk niobium diboride ceramics were consolidated by spark plasma sintering (SPS) at 1900°C. SPS resulted in dense specimens with a density of 98% of the theoretical density and a mean grain size of 6 μm. During the SPS consolidation, the hexagonal boron nitride (h‐BN) was formed from B2O3 on the powder particle surface and residual adsorbed nitrogen in the raw diboride powder. The room‐temperature strength of these NbB2 bulks was 420 MPa. The flexural strength of the NbB2 ceramics remained unchanged up to 1600°C. At 1700°C an increase in strength to 450 MPa was observed, which was accompanied by the disappearance of the secondary h‐BN phase. Finally, at 1800°C signs of plastic deformation were observed. Fractographic analysis revealed a number of etching pits and steplike surfaces suggestive of high‐temperature deformation. The temperature dependence of the flexural strength of NbB2 bulks prepared by SPS was compared with data for monolithic TiB2, HfB2 and ZrB2. Our analysis suggested that the thermal stresses accumulated during SPS consolidation may lead to additional strengthening at elevated temperatures. 相似文献
33.
Dmytro Savytskii Katherine Atwater Volkmar Dierolf Himanshu Jain 《Journal of the American Ceramic Society》2014,97(11):3458-3462
We have investigated devitrification of glasses within infrared transmitting xSbSI–(100 ? x)Sb2S3 pseudo‐binary series, which forms SbSI and Sb2S3 ferroelectric crystal phases. Differential scanning calorimetry (DSC) and X‐ray powder diffraction results show unusual behavior for the formation of the SbSI phase, which occurs by two parallel processes: one‐dimensional crystallization at low temperature which starts from the sample surface, and three‐dimensional bulk crystallization that continues the transformation to crystalline state at higher temperatures. The ratio of the intensities of the high‐temperature exothermal peak to the low‐temperature peak in DSC scans increases as the particle size and heating rate are increased. In contrast to the SbSI phase, the temperature of crystallization for the Sb2S3 phase does not depend on the particle size. Models are proposed for the origin of the various crystallization mechanisms. 相似文献
34.
Mykhaylo Marchuk Roman Tuchapskyy Dmytro Nespliak 《Computers & Mathematics with Applications》2019,77(10):2740-2763
A linear uncoupled quasi-static theory of thermoelastic anisotropic thin shells of constant thickness is formulated. In the derivation of equations and boundary conditions, a variant of the {}-approximation method, which is based on the variational principle of the thermoelasticity theory, is used. According to this method, the unknown functions are represented in the form of a series of Legendre polynomials in the transverse coordinate that agree with the force boundary conditions on the facial surfaces. From the system of equations of the constructed theory for generalised displacements, strains, and stresses, a system of equations for generalised displacements is obtained; this system is solved for the second derivatives of generalised displacements with respect to one of the Gaussian parameters of the middle surface. For a system of partial differential equations represented in such a form, the known techniques for the reduction of systems of two-dimensional equations to normal systems of ordinary differential equations, which can be solved by standard numerical methods, can be applied. The system of equations for generalised displacements is reduced to a normal system of ordinary differential equations in the case of a plane deformation of a cylindrical panel. Through the use of these equations and the S. K. Godunov method of orthogonal successive substitutions, the bending problems of a planar beam subjected to a mechanical load or a thermal load and a circular cylindrical panel exposed to a thermal load are numerically solved. It is demonstrated that the proposed equations are particularly suitable for the analysis of boundary effects in planar beams and circular cylindrical panels. 相似文献
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36.
Oxidation of γ‐irradiated microbial cellulose results in bioresorbable,highly conformable biomaterial
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Conformability to tissues and adequate mechanical strength are clinically useful properties of resorbable biomaterials used in soft tissue repair. Microbially derived cellulose is attractive as a high strength, highly conformable, and biocompatible material for tissue repair, but is not naturally resorbable. Here we show that controlled oxidation of microbial cellulose sheets that have been pre‐irradiated with γ‐radiation results in a resorbable and fully conformable membrane that can be rapidly rehydrated in aqueous fluids. In vitro studies showed that degradation of the resorbable membranes occurs in two major phases: (1) initial rapid degradation of about 70–80% of the entire sample followed by (2) slower degradation of an additional 5–10% which eventually levels off leaving a small amount of nonresorbable material. In vivo, prototype materials showed marked degradation at all time points, with the most rapid degradation occurring in the first 2–4 weeks. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2014 , 131, 39995. 相似文献
37.
38.
Nichole Cates Miller Eunkyung Cho Matthias J. N. Junk Roman Gysel Chad Risko Dongwook Kim Sean Sweetnam Chad E. Miller Lee J. Richter R. Joseph Kline Martin Heeney Iain McCulloch Aram Amassian Daniel Acevedo‐Feliz Christopher Knox Michael Ryan Hansen Dmytro Dudenko Bradley F. Chmelka Michael F. Toney Jean‐Luc Brédas Michael D. McGehee 《Advanced materials (Deerfield Beach, Fla.)》2012,24(45):6071-6079
39.
Andreas Zerr Gerhard Miehe Jinwang Li Dmytro A. Dzivenko Vadim K. Bulatov Heidi Höfer Nathalie Bolfan‐Casanova Michel Fialin Gerhard Brey Tomoaki Watanabe Masahiro Yoshimura 《Advanced functional materials》2009,19(14):2282-2288
Among binary compounds, there is a high potential for discovery of novel members (polymorphic phases or compounds) of the nitrides of transition metals group due to a pronounced dependence of the oxidation state of the metals (M) on pressure. The power of high pressure–high temperature (HP‐HT) route for synthesis of binary nitrides has already been demonstrated by the discovery of cubic nitrides of the group 4 and 14 elements, of crystalline polymorphs of P3N5, and by reports on formation of four noble metal nitrides. It is anticipated that such HP products exhibit, in addition to enhanced elastic and mechanical behavior, other functional properties making them interesting for industrial applications. Here, HP–HT synthesis research is extended to nitrides of group 5 elements, resulting in the discovery of a novel hard tantalum nitride, exhibiting U2S3 structure: η‐Ta2N3 (Pbnm, a = 8.1911(17) Å, b = 8.1830(17) Å, c = 2.9823(3) Å). The stoichiometry is supported by two independent means, verifying that η‐Ta2N3 is the first thermodynamically stable transition metal nitride with a N:M ratio exceeding 4:3. Due to its high hardness and peculiar texture (needle‐like and granular crystallites), η‐Ta2N3 may find practical applications as a hard fracture resistant material. 相似文献
40.
O. Fabrichnaya D. Pavlyuchkov R. Neher M. Herrmann H.J. Seifert 《Journal of the European Ceramic Society》2013,33(13-14):2457-2463
The mixing parameters of liquid phase in the Al2O3–Y2O3–AlN system were assessed based on differential thermal analysis (DTA) and scanning electron microscopy combined with energy dispersive X-ray spectroscopy (SEM/EDX) investigations of selected compositions. Phase diagram of the Y2O3–AlN system was calculated. Liquidus surface of the Al2O3–Y2O3–AlN system was constructed and compared with experimental results on primary crystallisation fields. Calculated temperatures of invariant reactions were in agreement with DTA results. Vertical sections of the Al2O3–Y2O3–AlN system were calculated and compared with experimental data 相似文献