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Aspects of rock permeability

Lianyang ZHANG

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 2,   Pages 102-116 doi: 10.1007/s11709-013-0201-2

Abstract: paper also highlights the scale effect on rock permeability, interconnectivity of discontinuities, and anisotropy

Keywords： rock     permeability     discontinuity     stress     temperature     scale effect     anisotropy    

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Investigation of tangential strain caused by shrinkage anisotropy using image analytical method

Fu Zongying,Zhao Jingyao and Cai Yingchun

Strategic Study of CAE 2014, Volume 16, Issue 4,   Pages 25-29

Abstract: elastic strain,viscoelastic creep strain, and mechano-sorptive (MS) creep, which caused by shrinkage anisotropy

Keywords： image analytical method     wood disks     shrinkage anisotropy     drying stress     tangential strain    

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Unified description of sand behavior

Feng ZHANG, Bin YE, Guanlin YE

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 2,   Pages 121-150 doi: 10.1007/s11709-011-0104-z

Abstract: In this paper, the mechanical behavior of sand, was systematically described and modeled with a elastoplastic model proposed by Zhang et al. [ ]. Without losing the generality of the sand, a specific sand called as Toyoura sand, a typical clean sand found in Japan, has been discussed in detail. In the model, the results of conventional triaxial tests of the sand under different loading and drainage conditions were simulated with a fixed set of material parameters. The model only employs eight parameters among which five parameters are the same as those used in Cam-clay model. Once the parameters are determined with the conventional drained triaxial compression tests and undrained triaxial cyclic loading tests, then they are fixed to uniquely describe the overall mechanical behaviors of the Toyoura sand, without changing the values of the eight parameters irrespective of what kind of the loadings or the drainage conditions may be. The capability of the model is discussed in a theoretical way.

Keywords： constitutive model     sand     stress-induced anisotropy     density     structure    

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Upper bound solution to seismic active earth pressure of submerged backfill subjected to partial drainage

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 6,   Pages 1480-1493 doi: 10.1007/s11709-021-0776-y

Abstract: In waterfront geotechnical engineering, seismic and drainage conditions must be considered in the design of retaining structures. This paper proposes a general analytical method to evaluate the seismic active earth pressure on a retaining wall with backfill subjected to partial steady seepage flow under seismic conditions. The method comprises the following steps: i) determination of the total head, ii) upper bound solution of seismic active earth thrust, and iii) deduction for the earth pressure distribution. The determination of total head h(x,z) relies on the Fourier series expansions, and the expressions of the seismic active earth thrust and pressure are derived by using the upper bound theorem. Parametric studies reveal that insufficient drainage and earthquakes are crucial factors that cause unfavorable earth pressure. The numerical results confirm the validity of the total head distribution. Comparisons indicate that the proposed method is consistent with other relevant existing methods in terms of predicting seismic active earth pressure. The method can be applied to the seismic design of waterfront retaining walls.

Keywords： seismic active earth pressure     partial seepage flow     pore pressure     anisotropy     upper bound theorem    

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Phosphorene: Current status, challenges and opportunities

Anandarup Goswami, Manoj B. Gawande

Frontiers of Chemical Science and Engineering 2019, Volume 13, Issue 2,   Pages 296-309 doi: 10.1007/s11705-018-1783-y

Abstract: The field of 2-dimensional (2D) materials has witnessed a sharp growth since its inception and can majorly be attributed to the substantial technical and scientific developments, leading to significant improvements in their syntheses, characterization and applications. In the list of 2D materials, the relatively newer addition is phosphorene, which ideally consists of a single layer of black phosphorous. Keeping in mind the past, and ongoing research activities, this short account offers a brief overview of the present status and the associated challenges in the field of phosphorene-related research, with special emphasis on their syntheses, properties, applications and future opportunities.

Keywords： phosphorene     black phosphorous     anisotropy     single layer     thermoelectric     chemical vapor deposition     catalysis    

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Effect of anisotropic characteristics on the mechanical behavior of asphalt concrete overlay

Lingyun YOU, Zhanping YOU, Kezhen YAN

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 1,   Pages 110-122 doi: 10.1007/s11709-018-0476-4

Abstract: This study was conducted to analyze the influence of anisotropy, modulus gradient properties, and theplane on the mechanical behaviors of AC overlays, as well as to quantify the influence of the degree of anisotropyComparing the mechanical behavior in terms of surface deflection, stress, and strain of the anisotropyshear stress in the AC overlay was the most significant output parameter affected by the degree of anisotropy

Keywords： asphalt concrete overlay     anisotropy     temperature gradients     modulus gradients     finite element simulation    

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Tunable In-Plane Anisotropy in Amorphous Sm–Co Films Grown on (011)- Oriented Single-Crystal Substrates Article

Wenhui Liang, Houbo Zhou, Jiefu Xiong, Fengxia Hu, Jia Li, Jian Zhang, Jing Wang, Jirong Sun, Baogen Shen

Engineering 2020, Volume 6, Issue 2,   Pages 158-163 doi: 10.1016/j.eng.2019.11.010

Abstract:

Amorphous Sm–Co films with uniaxial in-plane anisotropy have great potential for applicationThe most effective method to produce uniaxial in-plane anisotropy is to apply an in-plane magnetic fieldHere, we report a new way to produce uniaxial in-plane anisotropy by growing amorphous Sm–Co filmsThe tunable anisotropy constant, kA, is demonstrated with variation in the latticeThis work provides a new way to obtain in-plane anisotropy in amorphous Sm–Co films.

Keywords： Amorphous Sm–Co films     In-plane uniaxial anisotropy     Sputtering    

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Anisotropy of multi-layered structure with sliding and bonded interlayer conditions

Lingyun YOU, Kezhen YAN, Jianhong MAN, Nengyuan LIU

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 3,   Pages 632-645 doi: 10.1007/s11709-020-0617-4

Abstract: A better understanding of the mechanical behavior of the multi-layered structure under external loading is the most important item for the structural design and the risk assessment. The objective of this study are to propose and develop an analytical solution for the mechanical behaviors of multi-layered structure generated by axisymmetric loading, and to investigate the impact of anisotropic layers and interlayer conditions on the multi-layered structure. To reach these objectives, first, according to the governing equations, the analytical solution for a single layer was formulated by adopting the spatial Hankel transform. Then the global matrix technique is applied to achieve the analytical solution of multi-layered structure in Hankel domain. The sliding and bonded interlayer conditions were considered in this process. Finally, the numerical inversion of integral transform was used to solve the components of displacement and stress in real domain. Gauss-Legendre quadrature is a key scheme in the numerical inversion process. Moreover, following by the verification of the proposed analytical solution, one typical three-layered flexible pavement was applied as the computing carrier of numerical analysis for the multi-layered structure. The results have shown that the anisotropic layers and the interlayer conditions significantly affect the mechanical behaviors of the proposed structure.

Keywords： multi-layered structure     Hankel transformation     anisotropic     transversely isotropic     interlayer condition     Gauss-Legendre quadrature    

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Thermal buckling behavior of laminated composite plates: a finite-element study

Houdayfa OUNIS,Abdelouahab TATI,Adel BENCHABANE

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 1,   Pages 41-49 doi: 10.1007/s11465-014-0284-z

Abstract: Furthermore, a parametrical study was also conducted to investigate the effect of the anisotropy of composite

Keywords： thermal buckling     laminated composite plates     anisotropy     critical buckling temperature     finite-element method    

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Experimental study on compaction-induced anisotropic mechanical property of rockfill material

Xiangtao ZHANG, Yizhao GAO, Yuan WANG, Yu-zhen YU, Xun SUN

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 1,   Pages 109-123 doi: 10.1007/s11709-021-0693-0

Abstract: The anisotropy of rockfill materials has a significant influence on the performance of engineering structuresFurthermore, the anisotropy test of rockfill materials is complex and complicated, especially for triaxialthe extent of the particle interlocking effect, causing the specimen to exhibit different degrees of anisotropy

Keywords： rockfill     inclination of specimen preparation     anisotropy     mechanical property     mechanism    

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Analysis of cement-treated clay behavior by micromechanical approach

Dong-Mei ZHANG, Zhen-Yu YIN, Pierre-Yves HICHER, Hong-Wei HUANG

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 2,   Pages 137-153 doi: 10.1007/s11709-013-0204-z

Abstract: local stresses and local strains in inter-cluster planes are discussed in order to explain the induced anisotropytaking into account the main physical properties of cement-treated clay, including damage and induced anisotropy

Keywords： microstructure     cementation     clay     micromechanics     anisotropy     debonding    

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Si Micromachined Gyroscope Driven by the Rotating Carrier

Zhang Fuxue,Mao Xu,Zhang wei

Strategic Study of CAE 2006, Volume 8, Issue 8,   Pages 23-27

Abstract: that is driven by the rotating carrier's angular velocity.The silicon chip was manufactured by anisotropy

Keywords： Si     anisotropy etching     angular velocity     emulator    

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Perspective and Prospects for Rare Earth Permanent Magnets Review

J.M.D. Coey

Engineering 2020, Volume 6, Issue 2,   Pages 118-130 doi: 10.1016/j.eng.2018.11.034

Abstract:

Rare earth permanent magnets constitute a mature technology, but the shock of the 2011 rare earth crisis led to the re-evaluation of many ideas from the 1980s and 1990s about possible new hard magnets containing little or no rare earth (or heavy rare earth). Nd–Fe–B magnets have been painstakingly and skillfully optimized for a wide range of applications in which high performance is required at reasonable cost. Sm–Co is the material of choice when high-temperature stability is required, and Sm–Fe–N magnets are making their way into some niche applications. The scope for improvement in these basic materials by substitution has been rather thoroughly explored, and the effects of processing techniques on the microstructure and hysteresis are largely understood. A big idea from a generation ago—which held real potential to raise the record energy product significantly—was the oriented exchange-spring hard/soft nanocomposite magnet; however, it has proved very difficult to realize. Nevertheless, the field has evolved, and innovation has flourished in other areas. For example, electrical personal transport has progressed from millions of electric bicycles to the point where cars and trucks with electrical drives are becoming mainstream, and looks ready to bring the dominance of the internal combustion engine to an end. As the limitations of particular permanent magnets become clearer, ingenuity and imagination are being used to design around them, and to exploit the available mix of rare earth resources most efficiently. Huge new markets in robotics beckon, and the opportunities offered by additive manufacturing are just beginning to be explored. New methods of increasing magnet stability at elevated temperature are being developed, and integrated multifunctionality of hard magnets with other useful properties is now envisaged. These themes are elaborated here, with various examples.

Keywords： Rare earth magnets     Magnetic anisotropy     Coercivity     Energy product     Magnetic composites     Additive manufacturing    

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Mechanism of hot-deformation and magnetic domains of anisotropic die-upset rare earth permanent magnets

Li Wei,Zhu Minggang

Strategic Study of CAE 2011, Volume 13, Issue 10,   Pages 4-12

Abstract:

In this paper, high performance of anisotropic de-upset nanoscale Nd-Fe-B magnets is obtained: intrinsic coercivity Hcj=1 157 kA/m, remanence Br=1.465 T and maximum energy product (BH)max=426 kJ/m3. The fabrication procedure dependence, deformation mechanism and magnetic domains of these materials are discussed. It is found that the strain activation energy of the die-upset Nd-Fe-B magnets is about 380 kJ/mol based on the Arrhenius Model. The interaction domains are the typical characteristics of the magnetic structures of the magnets. And these domains play an important role in the coercivity mechanism and the corresponding maximum application temperature for the die-upset Nd-Fe-B magnets.

Keywords： nanoscale Nd-Fe-B magnets     hot press-hot deformation     anisotropy     magnetic domains    

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Altered white matter microarchitecture in Parkinson’s disease: a voxel-based meta-analysis of diffusion tensor imaging studies

Xueling Suo, Du Lei, Wenbin Li, Lei Li, Jing Dai, Song Wang, Nannan Li, Lan Cheng, Rong Peng, Graham J Kemp, Qiyong Gong

Frontiers of Medicine 2021, Volume 15, Issue 1,   Pages 125-138 doi: 10.1007/s11684-019-0725-5

Abstract: consistent white matter microarchitecture pattern in Parkinson’s disease (PD) reflected by fractional anisotropy

Keywords： Parkinson’s disease     diffusion tensor imaging     fractional anisotropy     meta-analysis     anisotropic effect size–signed    

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Title Author Date Type Operation

Aspects of rock permeability

Lianyang ZHANG

Journal Article

Investigation of tangential strain caused by shrinkage anisotropy using image analytical method

Fu Zongying,Zhao Jingyao and Cai Yingchun

Journal Article

Unified description of sand behavior

Feng ZHANG, Bin YE, Guanlin YE

Journal Article

Upper bound solution to seismic active earth pressure of submerged backfill subjected to partial drainage

Journal Article

Phosphorene: Current status, challenges and opportunities

Anandarup Goswami, Manoj B. Gawande

Journal Article

Effect of anisotropic characteristics on the mechanical behavior of asphalt concrete overlay

Lingyun YOU, Zhanping YOU, Kezhen YAN

Journal Article

Tunable In-Plane Anisotropy in Amorphous Sm–Co Films Grown on (011)- Oriented Single-Crystal Substrates

Wenhui Liang, Houbo Zhou, Jiefu Xiong, Fengxia Hu, Jia Li, Jian Zhang, Jing Wang, Jirong Sun, Baogen Shen

Journal Article

Anisotropy of multi-layered structure with sliding and bonded interlayer conditions

Lingyun YOU, Kezhen YAN, Jianhong MAN, Nengyuan LIU

Journal Article

Thermal buckling behavior of laminated composite plates: a finite-element study

Houdayfa OUNIS,Abdelouahab TATI,Adel BENCHABANE

Journal Article

Experimental study on compaction-induced anisotropic mechanical property of rockfill material

Xiangtao ZHANG, Yizhao GAO, Yuan WANG, Yu-zhen YU, Xun SUN

Journal Article

Analysis of cement-treated clay behavior by micromechanical approach

Dong-Mei ZHANG, Zhen-Yu YIN, Pierre-Yves HICHER, Hong-Wei HUANG

Journal Article

Si Micromachined Gyroscope Driven by the Rotating Carrier

Zhang Fuxue,Mao Xu,Zhang wei

Journal Article

Perspective and Prospects for Rare Earth Permanent Magnets

J.M.D. Coey

Journal Article

Mechanism of hot-deformation and magnetic domains of anisotropic die-upset rare earth permanent magnets

Li Wei,Zhu Minggang

Journal Article

Altered white matter microarchitecture in Parkinson’s disease: a voxel-based meta-analysis of diffusion tensor imaging studies

Xueling Suo, Du Lei, Wenbin Li, Lei Li, Jing Dai, Song Wang, Nannan Li, Lan Cheng, Rong Peng, Graham J Kemp, Qiyong Gong

Journal Article