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Elasto-plastic fatigue crack growth analysis of plane problems in the presence of flaws using XFEM
Sachin KUMAR,A. S. SHEDBALE,I. V. SINGH,B. K. MISHRA
《结构与土木工程前沿(英文)》 2015年 第9卷 第4期 页码 420-440 doi: 10.1007/s11709-015-0305-y
关键词: XFEM von-Mises yield criterion isotropic hardening fatigue crack growth J-integral
Adaptive selective ES-FEM limit analysis of cracked plane-strain structures
H. NGUYEN-XUAN,T. RABCZUK
《结构与土木工程前沿(英文)》 2015年 第9卷 第4期 页码 478-490 doi: 10.1007/s11709-015-0317-7
关键词: cracked structure limit analysis von Mises criterion edge-based strain smoothing second-order cone programming adaptive
Transient analysis of thermoelastic contact problem of disk brakes
Ali BELHOCINE, Mostefa BOUCHETARA
《机械工程前沿(英文)》 2013年 第8卷 第2期 页码 150-159 doi: 10.1007/s11465-013-0266-6
The main purpose of this study is to analyze the thermomechanical behavior of the dry contact between the brake disk and pads during the braking phase. The simulation strategy is based on computer code ANSYS11. The modeling of transient temperature in the disk is actually used to identify the factor of geometric design of the disk to install the ventilation system in vehicles. The thermal-structural analysis is then used with coupling to determine the deformation established and the Von Mises stresses in the disk, the contact pressure distribution in pads. The results are satisfactory compared to those found in the literature.
关键词: brake disks heat flux heat-transfer coefficient Von Mises stress contact pressure
Investigating peak stresses in fitting and repair patches of buried polyethylene gas pipes
Reza KHADEMI ZAHEDI, Pouyan ALIMOURI, Hooman KHADEMI ZAHEDI, Mohammad SHISHESAZ
《结构与土木工程前沿(英文)》 2020年 第14卷 第1期 页码 147-168 doi: 10.1007/s11709-019-0587-6
关键词: Ansys software polyethylene buried pipelines polyethylene joints polyethylene patches peak von Mises stress soil-pipe interaction temperature variation
《结构与土木工程前沿(英文)》 2021年 第15卷 第6期 页码 1494-1503 doi: 10.1007/s11709-021-0768-y
关键词: bearing capacity soil-rock interface Hoek−Brown yield criterion plasticity limit analysis
Shuvankar DAS; Debarghya CHAKRABORTY
《结构与土木工程前沿(英文)》 2022年 第16卷 第8期 页码 1040-1055 doi: 10.1007/s11709-022-0841-1
关键词: undercut vertical escarpment stability Hoek-Brown yield criterion PCP
Epidemiological study of a von Hippel-Lindau family in northwest China
null
《医学前沿(英文)》 2013年 第7卷 第3期 页码 378-385 doi: 10.1007/s11684-013-0276-0
von Hippel-Lindau (VHL) disease is a rare, inherited neoplastic disease characterized by hemangioblastomas (HBL) of the central nervous system (CNS), retinal angiomas, renal cell carcinomas (RCC), pancreatic endocrine tumors (PETs), pheochromocytomas, paragangliomas, and visceral cysts. We encountered a large VHL family in northwest China and conducted a systematic screening of the family members based on their epidemiological and clinical characteristics. A self-designed questionnaire was used to collect the general sociodemographic and health information of the family members. For the preliminary family screening, physical examination and abdomen B ultrasonography were performed. The suspected patients were subjected to cranial computerized tomography and fundus examination. The clinical data of the patients with confirmed VHL disease were collected from hospital records. A total of 63 lineal descendants in six generations were observed in the family (generations O, A, B, C, D, E), including 9 dead suspected cases (6 males, 3 females) and 10 living cases (2 males, 8 females). Among the 10 living cases, 4, 2, 1, 3, 4, 8, and 2 manifested HBLs of the CNS, PETs, RCC, pancreatic cysts, renal cysts, pheochromocytomas (4 hemi and 4 bilateral), and paragangliomas, respectively. Data showed that the morbidity of VHL disease in generation C was lower than that in generation B, but the age of onset was younger. This study is the first to report VHL disease in northwest China and VHL-associated PET cases in Chinese. Therefore, follow-up checkups of the family should be focused on younger generations. Proper family screening protocols should be followed for the treatment of patients with VHL disease.
关键词: von Hippel-Lindau disease epidemiology family screening pancreatic endocrine tumor
Deformation control criterion of shield tunnel under lateral relaxation of soft soil
《结构与土木工程前沿(英文)》 2023年 第17卷 第5期 页码 780-795 doi: 10.1007/s11709-023-0944-3
关键词: shield tunnel lateral relaxation of soil deformation control criterion of segment structure model test
Andrew LOCKLEY, Ted von HIPPEL
《工程管理前沿(英文)》 2021年 第8卷 第3期 页码 456-464 doi: 10.1007/s42524-020-0102-8
关键词: carbon dioxide removal Liquid Air Energy Storage Compressed Air Energy Storage geoengineering
The epidemiology of norovirus gastroenteritis in China: disease burden and distribution of genotypes
Honglu Zhou, Songmei Wang, Lorenz von Seidlein, Xuanyi Wang
《医学前沿(英文)》 2020年 第14卷 第1期 页码 1-7 doi: 10.1007/s11684-019-0733-5
关键词: molecular epidemiology norovirus disease burden genotype China
《农业科学与工程前沿(英文)》 2021年 第8卷 第4期 doi: 10.15302/J-FASE -2020355
Agriculture faces the dual challenges of food security and environmental sustainability. Here, we investigate current maize production at the field scale, analyze the yield gaps and impacting factors, and recommend measures for sustainably closing yield gaps. An experiment was conducted on a 3.9-ha maize seed production field in arid north-western China, managed with border and drip irrigation, respectively, in 2015 and 2016. The relative yield reached 70% in both years. However, drip irrigation saved 227 mm irrigation water during a drier growing season compared with traditional border irrigation, accounting for 44% of the maize evapotranspiration (ET). Yield variability under drip irrigation was 12.1%, lower than the 18.8% under border irrigation. Boundary line analysis indicates that a relative yield increase of 8% to 10% might be obtained by optimizing the yield-limiting factors. Plant density and soil available water content and available nitrogen were the three major factors involved. In conclusion, closing yield gaps with agricultural sustainability may be realized by optimizing agronomic, irrigation and fertilizer management, using water-saving irrigation methods and using site-specific management.
关键词: boundary line analysis irrigation method precision agriculture spatial variability yield gaps yield-limiting factors
Experimental research on ductile fracture criterion in metal forming
Song YU, Weiming FENG
《机械工程前沿(英文)》 2011年 第6卷 第3期 页码 308-311 doi: 10.1007/s11465-011-0233-z
Ductile fracture criterion is key limitation parameter in material forming. Accuracy predicting surface and internal failure in plastic deformation process affects on the technology design of workpiece and die greatly. Tension, compression, torsion and shearing test on 45# steel are utilized for providing the experimental values of the critical values at fracture, and 11 widely used ductile fracture criterion are selected to simulate the physical experiments and their relative accuracy for predicting and quantifying fracture initiation sites are investigated. The comparing results show that metal forming process under high triaxiality can be estimated successively using both Normalized Cockcroft-latham and the Brozzo ductile fracture criteria, but the Ayada and general Rice-Tracey model work very well for the low triaxiality cases.
关键词: ductile fracture criteria metal forming process material experiment stress triaxiality
A new fracture criterion for peridynamic and dual-horizon peridynamics
Jinhai ZHAO, Hesheng TANG, Songtao XUE
《结构与土木工程前沿(英文)》 2018年 第12卷 第4期 页码 629-641 doi: 10.1007/s11709-017-0447-1
关键词: Castigliano’s theorem breaking energy critical extension XFEM COD PD-COD
The effect of conservation tillage on crop yield in China
Hongwen LI,Jin HE,Huanwen GAO,Ying CHEN,Zhiqiang ZHANG
《农业科学与工程前沿(英文)》 2015年 第2卷 第2期 页码 179-185 doi: 10.15302/J-FASE-2015058
关键词: conservation tillage crop yield soil structure development strategies
Breeding strategies for increasing yield potential in super hybrid rice
Shihua CHENG,Xiaodeng ZHAN,Liyong CAO
《农业科学与工程前沿(英文)》 2015年 第2卷 第4期 页码 277-282 doi: 10.15302/J-FASE-2015081
标题 作者 时间 类型 操作
Elasto-plastic fatigue crack growth analysis of plane problems in the presence of flaws using XFEM
Sachin KUMAR,A. S. SHEDBALE,I. V. SINGH,B. K. MISHRA
期刊论文
Adaptive selective ES-FEM limit analysis of cracked plane-strain structures
H. NGUYEN-XUAN,T. RABCZUK
期刊论文
Transient analysis of thermoelastic contact problem of disk brakes
Ali BELHOCINE, Mostefa BOUCHETARA
期刊论文
Investigating peak stresses in fitting and repair patches of buried polyethylene gas pipes
Reza KHADEMI ZAHEDI, Pouyan ALIMOURI, Hooman KHADEMI ZAHEDI, Mohammad SHISHESAZ
期刊论文
Effect of interface adhesion factor on the bearing capacity of strip footing placed on cohesive soil overlying rock mass
期刊论文
Effect of undercut on the lower bound stability of vertical rock escarpment using finite element and power cone programming
Shuvankar DAS; Debarghya CHAKRABORTY
期刊论文
The carbon dioxide removal potential of Liquid Air Energy Storage: A high-level technical and economic appraisal
Andrew LOCKLEY, Ted von HIPPEL
期刊论文
The epidemiology of norovirus gastroenteritis in China: disease burden and distribution of genotypes
Honglu Zhou, Songmei Wang, Lorenz von Seidlein, Xuanyi Wang
期刊论文
PLANT DENSITY, IRRIGATION AND NITROGEN MANAGEMENT: THREE MAJOR PRACTICES IN CLOSING YIELD GAPS FOR AGRICULTURAL
期刊论文
A new fracture criterion for peridynamic and dual-horizon peridynamics
Jinhai ZHAO, Hesheng TANG, Songtao XUE
期刊论文
The effect of conservation tillage on crop yield in China
Hongwen LI,Jin HE,Huanwen GAO,Ying CHEN,Zhiqiang ZHANG
期刊论文