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Adaptive simulation of wave propagation problems including dislocation sources and random media

Hassan YOUSEFI, Jamshid FARJOODI, Iradj MAHMOUDZADEH KANI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 5,   Pages 1054-1081 doi: 10.1007/s11709-019-0536-4

Abstract: h-adaptive grid-based scheme for simulation of elastodynamic problems, involving seismic sources with discontinuoussolutions and random media.

Keywords： adaptive wavelet     adaptive smoothing     discontinuous solutions     stochastic media     spurious oscillations     Tikhonov    

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Discontinuous mechanical behaviors of existing shield tunnel with stiffness reduction at longitudinal

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 1,   Pages 37-52 doi: 10.1007/s11709-022-0920-3

Abstract: An analytical model is proposed to estimate the discontinuous mechanical behavior of an existing shieldThe results indicate that our proposed method is suitable for simulating the discontinuous mechanicalThe bending moment and shear force are discontinuous despite slight discontinuities in the deflectionOwing to the discontinuous characteristics, the internal forces and their abrupt changes at vulnerable

Keywords： tunnel–soil interaction     discontinuous analysis     longitudinal joints     existing shield tunnel     Timoshenko    

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Bending and vibration of a discontinuous beam with a curvic coupling under different axial forces

Heng LIU, Jie HONG, Dayi ZHANG

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 3,   Pages 417-429 doi: 10.1007/s11465-019-0584-4

Abstract: The transverse stiffness and vibration characteristics of discontinuous beams can significantly differthis study, the equations for the deflection curve and vibration frequencies of a simply supported discontinuousThe deflection and vibration frequencies of the discontinuous beam are studied under different axialLastly, an experimental study is conducted to investigate the vibration characteristics of a discontinuous

Keywords： discontinuous beam     bending stiffness     transverse vibration     axial loads     gyroscopic moments    

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Erratum to: Bending and vibration of a discontinuous beam with a curvic coupling under different axial

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-022-0709-z

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A continuous/discontinuous deformation analysis (CDDA) method based on deformable blocks for fracture

Yongchang CAI, Hehua ZHU, Xiaoying ZHUANG

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 4,   Pages 369-378 doi: 10.1007/s11709-013-0222-x

Abstract: In the framework of finite element meshes, a novel continuous/discontinuous deformation analysis (CDDAsuitable for modeling the fracture propagation because the switch from continuous deformation analysis to discontinuous

Keywords： fracture     crack     propagation     deformable block     continuous/discontinuous deformation analysis (CDDA)    

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Simulation of blast induced crater in jointed rock mass by discontinuous deformation analysis method

Youjun NING, Xinmei AN, Jun YANG, Guowei MA,

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 2,   Pages 223-232 doi: 10.1007/s11709-010-0022-5

Abstract: This paper adopts the discontinuous deformation analysis (DDA) method to simulate the rock blasting process

Keywords： blast crater     jointed rock mass     explosion gas pressure     discontinuous deformation analysis (DDA) method    

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Effect of end-to-end invagination pancreaticojejunostomy with circle discontinuous U suture in pancreatic

ZHANG Xuewen, XUAN Wei, JIANG Tao, JI Degang, YANG Yongsheng, ZHANG Dan, XIE Yingjun, MENG Zihui, ZHAO Jisheng

Frontiers of Medicine 2007, Volume 1, Issue 1,   Pages 46-48 doi: 10.1007/s11684-007-0009-3

Abstract: feasibility of a new operative method called end-to-end invagination pancreaticojejunostomy with circle discontinuousNo pancreatic fistula occurred in end-to-end invagination pancreaticojejunostomy with circle discontinuousincidence rate of the fistula following end-to-end invagination pancreaticojejunostomy with circle discontinuousEnd-to-end invagination pancreaticojejunostomy with circle discontinuous U suture has a definite effect
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The Major Root Causes of Smog in China and Technologies and Solutions to Reduce It

Ke Liu

Frontiers of Engineering Management 2016, Volume 3, Issue 4,   Pages 343-348 doi: 10.15302/J-FEM-2016053

Abstract: This paper discusses the two major root causes of smog in China. The first one is the distributed coal combustion in many small and medium sized boilers which have no emission control systems installed. To resolve this problem, there are several ways, such as increasing the centralized coal combustion for heat and power cogeneration; or converting coal to SNG in areas where there is enough water resource and removing the pollutants of the coal in the centralized coal to SNG plant, or refining the coal and making it cleaner first before combustion. The second major cause of smog is the low quality diesel and outdated diesel engines used in China. To solve this problem, there are some ways, such as improving the diesel quality to meet the national V standard, and meanwhile, enhancing the law enforcement to eliminate these outdated diesel engines that do not meet the national emission standards; in addition, combusting cleaner and cheaper fuel such as methanol or DME in the diesel engines is also an option for certain areas where there are abundant alternative fuels such as methanol to replace diesel.

Keywords： smog     emissions     coal refining     coal utilization     solutions    

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Discussion of solutions to ethical issues in real-world study

Sicheng Wang,Baoyan Liu,Ningning Xiong,Qi Xie,Runshun Zhang,Xuezhong Zhou,Jie Qiao

Frontiers of Medicine 2014, Volume 8, Issue 3,   Pages 316-320 doi: 10.1007/s11684-014-0354-y

Abstract: Moreover, some preliminary solutions to these issues, such as protecting subjects during the process

Keywords： real-world study     ethics     strategy    

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Exploring solutions for sustainable agriculture with “green” and “development” tags in Africa

Felix D. DAKORA, Jianbo SHEN, Fusuo ZHANG, Xiaoqiang JIAO

Frontiers of Agricultural Science and Engineering 2020, Volume 7, Issue 4,   Pages 363-365 doi: 10.15302/J-FASE-2020356

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LARM PKM solutions for torso design in humanoid robots

Marco CECCARELLI

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 4,   Pages 308-316 doi: 10.1007/s11465-014-0318-6

Abstract: In this paper problems for design and operation of solutions for a robotic torso are discussed by referring

Keywords： humanoid robots     torso design     parallel manipulators (PKM)     conceptual design    

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Key problems and solutions in arch dam heightening

Zuoguang FU, Yunlong HE, Sheng SU

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 1,   Pages 98-104 doi: 10.1007/s11709-010-0004-7

Abstract: The dam heightening, which is an effective way to increase reservoir volume, has been paid close attention by engineers. Three problems should be dealt with when an arch dam needs to be heightened: stress state getting worse at dam heel, cracking on new added concrete dam surface, and weak bonding between new added concrete and old dam. Taking Geba arch dam as an example, these problems are examined in details through simulation analysis by the finite element method. The tensile stresses on dam’s surface and joint face that have certain relations to the dam heightening can be controlled by some measures.

Keywords： arch dam     heighten     tensile stress     finite element method    

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Possible solutions for sludge dewatering in China

Wei WANG, Yuxiang LUO, Wei QIAO,

Frontiers of Environmental Science & Engineering 2010, Volume 4, Issue 1,   Pages 102-107 doi: 10.1007/s11783-010-0001-z

Abstract: In China, over 1.43×10 tons of dewatered sewage sludge, with 80% water content, were generated from wastewater treatment plants in 2007. About 60% of the COD removed during the wastewater treatment process becomes concentrated as sludge. Traditional disposal methods used by municipal solid waste treatment facilities, such as landfills, composting, or incineration, are unsuitable for sludge disposal because of its high water content. Disposal of sludge has therefore become a major focus of current environmental protection policies. The present status of sludge treatment and disposal methodology is introduced in this paper. Decreasing the energy consumption of sludge dewatering from 80% to 50% has been a key issue for safe and economic sludge disposal. In an analysis of sludge water distribution, thermal drying and hydrothermal conditioning processes are compared. Although thermal drying could result in an almost dry sludge, the energy consumption needed for this process is extremely high. In comparison, hydrothermal technology could achieve dewatered sewage sludge with a 50%–60% water content, which is suitable for composting, incineration, or landfill. The energy consumption of hydrothermal technology is lower than that required for thermal drying.

Keywords： sewage sludge disposal     water content     thermal drying     hydrothermal conditioning    

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Highly efficient and selective removal of vanadium from tungstate solutions by microbubble floating-extraction

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 5,   Pages 581-593 doi: 10.1007/s11705-022-2235-2

Abstract: In this work, selective removal of vanadium from tungstate solutions via microbubble floating-extractionThe results indicated that vanadium can be more easily mineralized over tungsten from tungstate solutionsfloating-extraction could be an efficient approach for separating selectively vanadium from tungstate solutions

Keywords： tungsten     vanadium     selective separation     reagent mineralization     microbubble floating-extraction    

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Controlled synthesis of uniform silver nanowires with high aspect ratios in aqueous solutions of gemini

XU Jian, LIU Weijun, LIU Honglai, HU Ying

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 3,   Pages 221-227 doi: 10.1007/s11705-007-0040-6

Abstract: A simple solution-phase approach has been demonstrated for the large-scale synthesis of silver nanowires with diameters in the range of 15 25 nm, and lengths usually in the range of tens of micrometers. In the presence of gemini surfactant 1,3-bis(cetyldimethylammonium) propane dibromide (16-3-16), the growth of silver could be directed into a highly anisotropic mode to form uniform nanowires with aspect ratios up to about 2,000. X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), energy-dispersive X-ray (EDX), X-ray powder diffraction (XRD), electron diffraction (ED), and UV-vis absorption spectroscopy, were used to characterize the as-prepared silver nanowires, indicating the formation of a highly pure phase, good crystallinity, as well as a uniform diameter.

Keywords： solution-phase     photoelectron spectroscopy     16-3-16     surfactant     transmission    

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Title Author Date Type Operation

Adaptive simulation of wave propagation problems including dislocation sources and random media

Hassan YOUSEFI, Jamshid FARJOODI, Iradj MAHMOUDZADEH KANI

Journal Article

Discontinuous mechanical behaviors of existing shield tunnel with stiffness reduction at longitudinal

Journal Article

Bending and vibration of a discontinuous beam with a curvic coupling under different axial forces

Heng LIU, Jie HONG, Dayi ZHANG

Journal Article

Erratum to: Bending and vibration of a discontinuous beam with a curvic coupling under different axial

Journal Article

A continuous/discontinuous deformation analysis (CDDA) method based on deformable blocks for fracture

Yongchang CAI, Hehua ZHU, Xiaoying ZHUANG

Journal Article

Simulation of blast induced crater in jointed rock mass by discontinuous deformation analysis method

Youjun NING, Xinmei AN, Jun YANG, Guowei MA,

Journal Article

Effect of end-to-end invagination pancreaticojejunostomy with circle discontinuous U suture in pancreatic

ZHANG Xuewen, XUAN Wei, JIANG Tao, JI Degang, YANG Yongsheng, ZHANG Dan, XIE Yingjun, MENG Zihui, ZHAO Jisheng

Journal Article

The Major Root Causes of Smog in China and Technologies and Solutions to Reduce It

Ke Liu

Journal Article

Discussion of solutions to ethical issues in real-world study

Sicheng Wang,Baoyan Liu,Ningning Xiong,Qi Xie,Runshun Zhang,Xuezhong Zhou,Jie Qiao

Journal Article

Exploring solutions for sustainable agriculture with “green” and “development” tags in Africa

Felix D. DAKORA, Jianbo SHEN, Fusuo ZHANG, Xiaoqiang JIAO

Journal Article

LARM PKM solutions for torso design in humanoid robots

Marco CECCARELLI

Journal Article

Key problems and solutions in arch dam heightening

Zuoguang FU, Yunlong HE, Sheng SU

Journal Article

Possible solutions for sludge dewatering in China

Wei WANG, Yuxiang LUO, Wei QIAO,

Journal Article

Highly efficient and selective removal of vanadium from tungstate solutions by microbubble floating-extraction

Journal Article

Controlled synthesis of uniform silver nanowires with high aspect ratios in aqueous solutions of gemini

XU Jian, LIU Weijun, LIU Honglai, HU Ying

Journal Article