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  • World Scientific Pub Co Pte Ltd  (8)
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  • World Scientific Pub Co Pte Ltd  (8)
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  • 1
    Online Resource
    Online Resource
    TEMPERATURE AND STRAIN RATE SENSITIVITY OF ULTRAFINE-GRAINED COPPER UNDER UNIAXIAL COMPRESSION
    World Scientific Pub Co Pte Ltd ; 2013
    In:  International Journal of Applied Mechanics Vol. 05, No. 02 ( 2013-06), p. 1350016-
    Details
    In: International Journal of Applied Mechanics, World Scientific Pub Co Pte Ltd, Vol. 05, No. 02 ( 2013-06), p. 1350016-
    Abstract: Uniaxial compressive experiments of ultrafine-grained (UFG) copper fabricated by equal channel angular pressing method were performed at temperatures ranging from 77 K to 573 K under quasi-static and dynamic loading conditions. Based on the experimental results, the influence of temperature on flow stress, strain hardening rate and strain rate sensitivity (SRS) were investigated carefully. The results show that the flow stress of UFG copper displays much larger sensitivity to testing temperature than that of coarse grained copper. Meanwhile, both the strain hardening rate and its sensitivity to temperature of UFG copper are lower than those of its coarse counterpart. The SRS of UFG copper also shows apparent dependence on temperature. Although the estimated activation volume of UFG- Cu is on the order of ~10 b 3 , which is on the same order with that of grain boundary diffusion processes, these processes should be ruled out as dominant mechanisms for UFG- Cu at our experimental temperature and strain rate range. Instead, it is suggested that the dislocation-grain boundary interactions process might be the dominant thermally activated mechanism for UFG- Cu .
    Type of Medium: Online Resource
    ISSN: 1758-8251 , 1758-826X
    URL: Article
    DOI: 10.1142/S1758825113500166
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2013
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  • 2
    Online Resource
    Online Resource
    Teaching Quality Analysis of College Ideological and Political Education Based on Deep Learning
    World Scientific Pub Co Pte Ltd ; 2022
    In:  Journal of Interconnection Networks Vol. 22, No. Supp05 ( 2022-07)
    Details
    In: Journal of Interconnection Networks, World Scientific Pub Co Pte Ltd, Vol. 22, No. Supp05 ( 2022-07)
    Abstract: A social activity that uses certain ideas, concepts, political views, and moral values in a society or social group enriches students’ ideology and allows learners to form ideological and moral qualities that correspond to their social and political establishment. The continuous improvement of their complete quality and technical skills is at the heart of social and economic growth. In ideological and political education, risk factors are widely influenced, including the impact of educational purposes and education providers. In this paper, Deep Learning-Based Innovation Path Optimization Methodology (DL-IPOM) has been proposed to strengthen data awareness, improve the way of thinking in ideological and political education. The political instructional collaborative analysis is integrated with DL-IPOM to boost Ideological and political education excellence. The simulation analysis is conducted at (98.22%). The consistency of the proposed framework is demonstrated by efficiency, high accuracy (98.34%), overshoot index rate (94.2%), political thinking rate (93.6%), knowledge retention rate (80.2%), reliability rate (97.6%), performance (94.37%) when compared to other methods.
    Type of Medium: Online Resource
    ISSN: 0219-2659 , 1793-6713
    URL: Article
    DOI: 10.1142/S021926592147006X
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2022
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  • 3
    Online Resource
    Online Resource
    NUMERICAL STUDY ON THE THERMAL PERFORMANCE OF A PHASE CHANGE HEAT EXCHANGER (PCHE) WITH INNOVATIVE FRACTAL TREE-SHAPED FINS
    World Scientific Pub Co Pte Ltd ; 2020
    In:  Fractals Vol. 28, No. 05 ( 2020-08), p. 2050083-
    Details
    In: Fractals, World Scientific Pub Co Pte Ltd, Vol. 28, No. 05 ( 2020-08), p. 2050083-
    Abstract: For alleviating energy shortage and environmental problems, it is of great importance to improve the energy charging and discharging efficiency of thermal energy storage systems. In this context, an innovative phase change heat exchanger (PCHE) with fractal tree-shaped fins is presented in this paper. A numerical investigation of the solidification behaviors in the PCHE with fractal tree-shaped fins is conducted. The dynamic temperature response and the solidification front evolution in the PCHE are analyzed and discussed. Furthermore, two evaluation criteria, including total solidification time and energy charging efficiency, are introduced to quantitatively study the effect of fin material on the solidification heat transfer characteristics. The results indicate that the fractal tree-shaped fin leads to a uniform temperature distribution of phase change material (PCM). The temperature response of fin is faster than that of PCM due to its high thermal conductivity. Moreover, the fractal tree-shaped fin breaks the restriction of gradually forward fashion of solidification front in the traditional PCHE and dramatically improves the energy discharging performance. The material of fractal tree-shaped fins is an essential factor affecting the solidification performance of the PCHE. The energy discharging performance of PCHE with pure copper fins is the best, whereas that with cupronickel fins is the worst. However, from the perspective of practical application, aluminum is the best potential alternative because of its relatively high thermal conductivity, lighter weight, and low cost.
    Type of Medium: Online Resource
    ISSN: 0218-348X , 1793-6543
    URL: Article
    DOI: 10.1142/S0218348X20500838
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2020
    SSG: 11
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Nitrogen-Doped Mesoporous Carbons Bearing Fe3O4 as Adsorbent for Effective Ag(I) Removal
    World Scientific Pub Co Pte Ltd ; 2020
    In:  Nano Vol. 15, No. 10 ( 2020-10), p. 2050134-
    Details
    In: Nano, World Scientific Pub Co Pte Ltd, Vol. 15, No. 10 ( 2020-10), p. 2050134-
    Abstract: Magnetic nitrogen-doped mesoporous carbon (Fe 3 O 4 /NMC) composites were prepared by a template method and in situ formation method. Fe 3 O 4 /NMC was used as adsorbent to removal Ag(I) from aqueous solution. Fe 3 O 4 /NMC showed excellent adsorption capacity for Ag(I). The Ag(I) was chelated by –NH-/–NH 2 groups to chelate ligand and reduced by free –NH 2 to Ag0, respectively.
    Type of Medium: Online Resource
    ISSN: 1793-2920 , 1793-7094
    URL: Article
    DOI: 10.1142/S1793292020501349
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2020
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  • 5
    Online Resource
    Online Resource
    Post-Yielding Behavior of Hinge-Supported Wall with Buckling-Restrained Braces in Base
    World Scientific Pub Co Pte Ltd ; 2019
    In:  Journal of Earthquake and Tsunami Vol. 13, No. 03n04 ( 2019-06)
    Details
    In: Journal of Earthquake and Tsunami, World Scientific Pub Co Pte Ltd, Vol. 13, No. 03n04 ( 2019-06)
    Abstract: A novel structural wall with hinge support and buckling restrained braces (BRBs) set in the base (HWBB) is studied. HWBB can be applied to precast manufacturing due to its considerable ductility and the separate loading mechanism in HWBB–frame structure. In elastic stage, BRBs play a brace role to make the hinged wall resist horizontal forces like a shear wall. BRBs dissipate seismic energy through plastic and hysteresis effects after yielding and the damage is only concentrated in BRBs. The performance of an HWBB is equivalent to a shear wall structure with excellent ductility and stable energy dissipation capacity. Numerical analysis indicates that the hinged wall body in the HWBB well controls the deformation mode of the structure, avoiding the concentration of story drifts, thereby protecting the remaining parts of the structure. It is revealed that the moments of the wall body will generate significant increments after BRBs yielding, and the Seismic Intensity Superposition Method is proposed to calculate the moments. In this method, nonlinear response of an HWBB can be regarded as the sum of the responses of two elastic corresponding structures excited with two parts of the seismic intensity, respectively. Modes and moments equations of the hinged wall with uniform distribution of stiffness and mass are derived, and calculation results coincide with that of the nonlinear time history analysis (NHA). For a more general case, the white noise scan method is proposed to solve the structure’s natural characteristics and to further calculate the response. Finally, the post-yielding moment calculation method and the process based on design response spectrum are proposed. It is proved that the moments from proposed Seismic Intensity Superposition Method can envelop most of the moments from NHA, and it is a good estimate of the response of HWBB in nonlinear stage.
    Type of Medium: Online Resource
    ISSN: 1793-4311 , 1793-7116
    URL: Article
    DOI: 10.1142/S1793431119400037
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2019
    detail.hit.zdb_id: 2380408-7
    SSG: 16,13
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  • 6
    Online Resource
    Online Resource
    INFLUENCE OF BILLET SIZE ON THE DEFORMATION INHOMOGENEITY OF MATERIAL PROCESSED BY EQUAL CHANNEL ANGULAR PRESSING
    World Scientific Pub Co Pte Ltd ; 2008
    In:  International Journal of Modern Physics B Vol. 22, No. 31n32 ( 2008-12-30), p. 6088-6093
    Details
    In: International Journal of Modern Physics B, World Scientific Pub Co Pte Ltd, Vol. 22, No. 31n32 ( 2008-12-30), p. 6088-6093
    Abstract: Equal channel angular pressing provides a convenient procedure for introducing an ultrafine grained microstructure into materials. In this paper, the deformation distribution of cylindrical billet with different diameters during equal channel angular pressing (ECAP) was simulated using 3D finite element models. The plastic strains in three perpendicular planes of the billet are predicted. And the influence of the friction between billet and channel on the equivalent plastic strain is also determined. The results show that the equivalent plastic strains are inhomogeneous in three directions and the inhomogeneity of the strain distribution inside ECAPed materials is slightly related to their diameters, which means larger scale UFG materials can be achieved via ECAP process.
    Type of Medium: Online Resource
    ISSN: 0217-9792 , 1793-6578
    URL: Article
    DOI: 10.1142/S0217979208051625
    RVK:
    UA 4381.B
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2008
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  • 7
    Online Resource
    Online Resource
    New Mechanical Models to Study the Impact of Contact, Wear, and Adhesion of Lunar Dust on Space Materials
    World Scientific Pub Co Pte Ltd ; 2023
    In:  International Journal of Applied Mechanics Vol. 15, No. 04 ( 2023-05)
    Details
    In: International Journal of Applied Mechanics, World Scientific Pub Co Pte Ltd, Vol. 15, No. 04 ( 2023-05)
    Abstract: Lunar dust significantly impacts spacecraft and spacesuits during lunar exploration. The mechanical properties of lunar dust, including adhesion, contact, and wear, are investigated using new mechanical models proposed herein. First, the main contribution for mechanics of this paper was implementing the conical Johnson, Kendall, and Roberts (JKR) model using the energy method for investigating the normal and tangential mechanical characteristics of lunar dust. Additionally, the mechanical properties of lunar dust, such as adhesion, contact, and wear are proposed considering the adhesion effect using the mechanical model. The validity and accuracy of the conical JKR model were verified by comparing the results with experimental data and existing spherical and cylindrical JKR models. Furthermore, a new wear mechanical model for typical lunar dust is proposed considering the adhesion effect. The wear width and coefficients based on the wear model fit well with the existing experiment; therefore, the proposed model can be used to calculate the wear coefficient. Additionally, it can be used to estimate the contact force using an atomic force microscope (AFM) probe and analyze the adhesion between rough particles. The mechanical properties of lunar dust based on our models can be valuable for the characteristic research of in situ resource development and manned lunar landings.
    Type of Medium: Online Resource
    ISSN: 1758-8251 , 1758-826X
    URL: Article
    DOI: 10.1142/S1758825123500254
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2023
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  • 8
    Online Resource
    Online Resource
    Evaluating the Effect of Buckling-Restrained Brace Model on Seismic Structural Responses
    World Scientific Pub Co Pte Ltd ; 2017
    In:  Journal of Earthquake and Tsunami Vol. 11, No. 02 ( 2017-06), p. 1750002-
    Details
    In: Journal of Earthquake and Tsunami, World Scientific Pub Co Pte Ltd, Vol. 11, No. 02 ( 2017-06), p. 1750002-
    Abstract: Numerical simulation is an important measure to study the seismic performance of buckling-restrained braced frames (BRBFs). Practically, some simplified models, such as the elastic–plastic with kinematic hardening model and the elastic perfectly-plastic model, are used to simulate the behavior of buckling-restrained brace (BRBs). To provide structural engineers the reference of errors when simplified models are used, this paper comparatively evaluates the effect of the BRB model on seismic structural responses using the OpenSees software. A comparison is made on six-storey and 16-storey BRBFs with rigid beam-to-column connections; these are designed according to Chinese seismic design code. Moreover, the effects of the post-yielding stiffness ratio of frame [Formula: see text] and the stiffness ratio of BRB to frame [Formula: see text] on the errors are specifically investigated through a parametric study of both BRBFs. The results show that the seismic response average errors of the simplified models are mostly less than 5%, which satisfies the engineering requirements.
    Type of Medium: Online Resource
    ISSN: 1793-4311 , 1793-7116
    URL: Article
    DOI: 10.1142/S1793431117500026
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2017
    detail.hit.zdb_id: 2380408-7
    SSG: 16,13
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