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Strain localization analyses of idealized sands in biaxial tests by distinct element method

Mingjing JIANG, Hehua ZHU, Xiumei LI,

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 2,   Pages 208-222 doi: 10.1007/s11709-010-0025-2

Abstract: This paper presents a numerical investigation on the strain localization of an idealized sand in biaxiallocalization.The study shows that strain localization of the granular material in the tests proceeds with localizationsof void ratio, strain and APR, and distortions of stress field and force chains.In addition, both thickness and inclination of the shear band change with the increasing of axial strain

Keywords： idealized sand     strain localization     numerical analyses     distinct element method (DEM)    

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Robotized machining of big work pieces: Localization of supporting heads

Wojciech SZYNKIEWICZ, Teresa ZIELIŃSKA, Włodzimierz KASPRZAK

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 4,   Pages 357-369 doi: 10.1007/s11465-010-0103-0

Abstract: A planner for a self adaptable and reconfigurable fixture system is proposed. The system is composed of mobile support agents that support thin sheet metal parts to minimize part dimensional deformation during drilling and milling operations. Compliant sheet metal parts are widely used in various manufacturing processes including automotive and aerospace industries. The main role of the planner is to generate an admissible plan of relocation of the mobile agents. It has to find the admissible locations for the supporting heads that provide continuous support in close proximity to the tool and trajectories of the mobile bases characterized by very high speeds during the relocation phases.

Keywords： fixture     robot     milling     drilling    

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Optimal localization of complex surfaces in CAD-based inspection

XU Jinting, LIU Weijun, SUN Yuwen

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4,   Pages 426-433 doi: 10.1007/s11465-008-0068-4

Abstract: Complex surface inspection requires the optimal localization of the measured surface related to the designThis paper presents a new technique for solving the localization problem.The basic approach consists of two steps: 1) rough localization of the measured points to the designsurface based on curvature features, which can produce a good initial estimate for the optimal localization; 2) fine localization based on the least-square principle so that the deviation between the measured

Keywords： deviation     comparison     non-linear     localization     inspection    

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Concepts and implementation of strain-based criteria in design codes for steel structures

Reidar BJORHOVDE

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 3,   Pages 210-216 doi: 10.1007/s11709-012-0165-7

Abstract: If stresses or forces are needed, these are easily determined by the value of the strain and the relevant

Keywords： steel     stress-strain characteristics     tension test     strain design     actual behavior     improved design codes    

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Full-field dynamic strain reconstruction of an aero-engine blade from limited displacement responses

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 1, doi: 10.1007/s11465-022-0731-1

Abstract: Blade strain distribution and its change with time are crucial for reliability analysis and residualTraditional strain measurements are achieved by strain gauges (SGs) in a contact manner at discrete positionsThis study proposes a method of full-field and real-time strain reconstruction of an aero-engine bladeLimited optical measured displacement responses are utilized to reconstruct the full-field strain.The full-field strain distribution is in-time visualized.

Keywords： aero-engine blade     displacement response     dynamic strain reconstruction     mode shape     strain gauge    

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Lipin3 leads to hypertriglyceridemia and obesity by disrupting the expression and nucleocytoplasmic localization

Frontiers of Medicine doi: 10.1007/s11684-023-1003-0

Abstract: Lipin proteins including Lipin 1–3 act as transcriptional co-activators and phosphatidic acid phosphohydrolase enzymes, which play crucial roles in lipid metabolism. However, little is known about the function of Lipin3 in triglyceride (TG) metabolism. Here, we identified a novel mutation (NM_001301860: p.1835A>T/p.D612V) of Lipin3 in a large family with hypertriglyceridemia (HTG) and obesity through whole-exome sequencing and Sanger sequencing. Functional studies revealed that the novel variant altered the half-life and stability of the Lipin3 protein. Hence, we generated Lipin3 heterozygous knockout (Lipin3-heKO) mice and cultured primary hepatocytes to explore the pathophysiological roles of Lipin3 in TG metabolism. We found that Lipin3-heKO mice exhibited obvious obesity, HTG, and non-alcoholic fatty liver disorder. Mechanistic study demonstrated that the haploinsufficiency of Lipin3 in primary hepatocytes may induce the overexpression and abnormal distribution of Lipin1 in cytosol and nucleoplasm. The increased expression of Lipin1 in cytosol may contribute to TG anabolism, and the decreased Lipin1 in nucleoplasm can reduce PGC1α, further leading to mitochondrial dysfunction and reduced TG catabolism. Our study suggested that Lipin3 was a novel disease-causing gene inducing obesity and HTG. We also established a relationship between Lipin3 and mitochondrial dysfunction.

Keywords： Lipin3     Lipin1     hypertriglyceridemia     obesity     mitochondrial dysfunction    

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Strain and process engineering toward continuous industrial fermentation

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 10,   Pages 1336-1353 doi: 10.1007/s11705-022-2284-6

Abstract: Most current biotechnology industries are based on batch or fed-batch fermentation processes, which often show low productivity and high production costs compared to chemical processes. To increase the economic competitiveness of biological processes, continuous fermentation technologies are being developed that offer significant advantages in comparison with batch/fed-batch fermentation processes, including: (1) removal of potential substrates and product inhibition, (2) prolonging the microbial exponential growth phase and enhancing productivity, and (3) avoiding repeated fermentation preparation and lowering operation and installation costs. However, several key challenges should be addressed for the industrial application of continuous fermentation processes, including (1) contamination of the fermentation system, (2) degeneration of strains, and (3) relatively low product titer. In this study, we reviewed and discussed metabolic engineering and synthetic biology strategies to address these issues.

Keywords： continuous fermentation     productivity     contamination     strain degeneration     metabolic engineering    

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Behavior of steel fiber–reinforced high-strength concrete at medium strain rate

Chujie JIAO, Wei SUN, Shi HUAN, Guoping JIANG

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 2,   Pages 131-136 doi: 10.1007/s11709-009-0027-0

Abstract: Impact compression experiments for the steel fiber–reinforced high-strength concrete (SFRHSC) at medium strainThe experimental results showed that, when the strain rate increased from threshold value to 90 s , theincreased about 30%, the elastic modulus of SFRHSC increased about 50%, and the increase in the peak strain

Keywords： steel fiber–reinforced high-strength concrete (SFRHSC)     high strain rates     split Hopkinson press bar (SHPB)     strain rate hardening effects    

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Vibration analysis of nano-structure multilayered graphene sheets using modified strain gradient theory

Amir ALLAHBAKHSHI,Masih ALLAHBAKHSHI

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 2,   Pages 187-197 doi: 10.1007/s11465-015-0339-9

Abstract:

In this paper, for the first time, the modified strain gradient theory is used as a new size-dependentAfter obtaining the governing equations based on modified strain gradient theory via principle of minimum

Keywords： graphene     van der Waals (vdW) force     modi- fied strain gradient elasticity theory     size effect parameter    

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Yield-height correlation and QTL localization for plant height in two lowland switchgrass populations

Shiva O. MAKAJU, Yanqi WU, Michael P. ANDERSON, Vijaya G. KAKANI, Michael W. SMITH, Linglong LIU, Hongxu DONG, Dan CHANG

Frontiers of Agricultural Science and Engineering 2018, Volume 5, Issue 1,   Pages 118-128 doi: 10.15302/J-FASE-2018201

Abstract: Switchgrass ( L.), as a model herbaceous crop species for bioenergy production, is targeted to improve biomass yield and feedstock quality. Plant height is a major component contributing to biomass yield. Accordingly, the objectives of this research were to analyze phenotypic variation for biomass and plant height and the association between them and to localize associated plant height QTLs. Two lowland switchgrass mapping populations, one selfed and another hybrid population established in the field at Perkins and Stillwater, Oklahoma, were deployed in the experiment for two years post establishment. Large genetic variation existed for plant biomass and height within the two populations. Plant height was positively correlated with biomass yield in the selfed population ( = 0.39, <0.0001) and the hybrid population ( = 0.41, <0.0001). In the selfed population, a joint analysis across all environments revealed 10 QTLs and separate analysis for each environment, collectively revealed 39 QTLs related to plant height. In the hybrid population, the joint analysis across overall environments revealed 35 QTLs and the separate analysis for each environment revealed 38 QTLs. The findings of this research contribute new information about the genetic control for plant height and will be useful for future plant breeding and genetic improvement programs in lowland switchgrass.

Keywords： yield-height     QTL localization     lowland switchgrass    

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FEM-based strain analysis study for multilayer sheet forming process

Rongjing ZHANG,Lihui LANG,Rizwan ZAFAR

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 4,   Pages 373-379 doi: 10.1007/s11465-015-0371-9

Abstract: To further explore the novel method, this study conducts a finite element method-based (FEM-based) strain

Keywords： finite element method (FEM)     strain analysis     multilayer sheet forming    

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Stress-strain relationship of concrete in freeze-thaw environment

ZOU Chaoying, ZHAO Juan, LIANG Feng

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 2,   Pages 184-188 doi: 10.1007/s11709-008-0029-3

Abstract: Afterwards these frozen-thawed specimens were tested on monotonic axial load; stress-strain testing curvesFinally, stress-strain theoretical curvilinear equations and correlated parameters relating to the loss

Keywords： stress-strain theoretical     freeze-thaw     capacity     reference     eighteen concrete    

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Fictitious soil pile model for dynamic analysis of pipe piles under high-strain conditions

Frontiers of Structural and Civil Engineering   Pages 915-934 doi: 10.1007/s11709-023-0907-8

Abstract: pile (FSP) model is developed to simulate the behavior of pipe piles with soil plugs undergoing high-strain

Keywords： fictitious soil pile     soil plug     pipe piles     high-strain dynamic analysis     one-dimensional wave theory    

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Influence of freeze–thaw damage gradient on stress–strain relationship of stressed concrete

Frontiers of Structural and Civil Engineering   Pages 1326-1340 doi: 10.1007/s11709-023-0014-x

Abstract: Influence of freeze–thaw damage gradient on stress–strain relationship of stressed concrete

Keywords： strain relationship concrete    

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Separation and extraction of bridge dynamic strain data

Baijian WU, Zhaoxia LI, Ying WANG, T. H. T. CHAN,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 4,   Pages 395-400 doi: 10.1007/s11709-009-0049-7

Abstract: temperature by the stain gauge and temperature sensor at the same location, the information in the strainAlso, a simple algorithm was developed to separate the three types of information and to extract the strainAs an application of the proposed method, the effect of strain deformation and noises on the fatigueThe strain due to temperature varying attributes a little to the errors of fatigue assessment; however/stress amplitude picked up by real structural stress or strain.

Keywords： dynamic     valuable     separatrix     strain/stress amplitude     frequency    

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Title Author Date Type Operation

Strain localization analyses of idealized sands in biaxial tests by distinct element method

Mingjing JIANG, Hehua ZHU, Xiumei LI,

Journal Article

Robotized machining of big work pieces: Localization of supporting heads

Wojciech SZYNKIEWICZ, Teresa ZIELIŃSKA, Włodzimierz KASPRZAK

Journal Article

Optimal localization of complex surfaces in CAD-based inspection

XU Jinting, LIU Weijun, SUN Yuwen

Journal Article

Concepts and implementation of strain-based criteria in design codes for steel structures

Reidar BJORHOVDE

Journal Article

Full-field dynamic strain reconstruction of an aero-engine blade from limited displacement responses

Journal Article

Lipin3 leads to hypertriglyceridemia and obesity by disrupting the expression and nucleocytoplasmic localization

Journal Article

Strain and process engineering toward continuous industrial fermentation

Journal Article

Behavior of steel fiber–reinforced high-strength concrete at medium strain rate

Chujie JIAO, Wei SUN, Shi HUAN, Guoping JIANG

Journal Article

Vibration analysis of nano-structure multilayered graphene sheets using modified strain gradient theory

Amir ALLAHBAKHSHI,Masih ALLAHBAKHSHI

Journal Article

Yield-height correlation and QTL localization for plant height in two lowland switchgrass populations

Shiva O. MAKAJU, Yanqi WU, Michael P. ANDERSON, Vijaya G. KAKANI, Michael W. SMITH, Linglong LIU, Hongxu DONG, Dan CHANG

Journal Article

FEM-based strain analysis study for multilayer sheet forming process

Rongjing ZHANG,Lihui LANG,Rizwan ZAFAR

Journal Article

Stress-strain relationship of concrete in freeze-thaw environment

ZOU Chaoying, ZHAO Juan, LIANG Feng

Journal Article

Fictitious soil pile model for dynamic analysis of pipe piles under high-strain conditions

Journal Article

Influence of freeze–thaw damage gradient on stress–strain relationship of stressed concrete

Journal Article

Separation and extraction of bridge dynamic strain data

Baijian WU, Zhaoxia LI, Ying WANG, T. H. T. CHAN,

Journal Article