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Investigating peak stresses in fitting and repair patches of buried polyethylene gas pipes

Reza KHADEMI ZAHEDI, Pouyan ALIMOURI, Hooman KHADEMI ZAHEDI, Mohammad SHISHESAZ

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 1,   Pages 147-168 doi: 10.1007/s11709-019-0587-6

Abstract: which are used to mend the defected pipelines by performing a finite element analysis to calculate peakAccording to the results, the peak stress values take place in the middle of the fitting and at its internal

Keywords： Ansys software     polyethylene     buried pipelines     polyethylene joints     polyethylene patches     peak von Mises    

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Transient analysis of thermoelastic contact problem of disk brakes

Ali BELHOCINE, Mostefa BOUCHETARA

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 2,   Pages 150-159 doi: 10.1007/s11465-013-0266-6

Abstract: thermal-structural analysis is then used with coupling to determine the deformation established and the VonMises stresses in the disk, the contact pressure distribution in pads.

Keywords： brake disks     heat flux     heat-transfer coefficient     Von Mises stress     contact pressure    

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Adaptive selective ES-FEM limit analysis of cracked plane-strain structures

H. NGUYEN-XUAN,T. RABCZUK

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 4,   Pages 478-490 doi: 10.1007/s11709-015-0317-7

Abstract: This paper presents a simple and efficient approach for predicting the plastic limit loads in cracked plane-strain structures. We use two levels of mesh repartitioning for the finite element limit analysis. The master level handles an adaptive primal-mesh process through a dissipation-based indicator. The slave level performs the subdivision of each triangle into three sub-triangles and constitutes a dual mesh from a pair of two adjacent sub-triangles shared by common edges of the primal mesh. Applying a strain smoothing projection to the strain rates on the dual mesh, the incompressibility constraint and the flow rule constraint are imposed over the edge-based smoothing domains and everywhere in the problem domain. The limit analysis problem is recast into the compact form of a second-order cone programming (SOCP) for the purpose of exploiting interior-point solvers. The present method retains a low number of optimization variables. It offers a convenient way for designing and solving the large-scale optimization problems effectively. Several benchmark examples are given to show the simplicity and effectiveness of the present method.

Keywords： cracked structure     limit analysis     von Mises criterion     edge-based strain smoothing     second-order cone programming    

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Epidemiological study of a von Hippel-Lindau family in northwest China

Jingyao Zhang, Dapeng Wu, Hong Ai, Jigang Bai, Shunbin Dong, Qinling Yang, Kai Qu, Lei Zhou, Xinsen Xu, Chang Liu

Frontiers of Medicine 2013, Volume 7, Issue 3,   Pages 378-385 doi: 10.1007/s11684-013-0276-0

Abstract:

von Hippel-Lindau (VHL) disease is a rare, inherited neoplastic disease characterized by hemangioblastomas

Keywords： von Hippel-Lindau disease     epidemiology     family screening     pancreatic endocrine tumor    

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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

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 4,   Pages 420-440 doi: 10.1007/s11709-015-0305-y

Abstract: The von-Mises failure criterion has been used with isotropic hardening.

Keywords： XFEM     von-Mises yield criterion     isotropic hardening     fatigue crack growth     J-integral    

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Factors influencing peak bone mass gain

Xiaowei Zhu, Houfeng Zheng

Frontiers of Medicine 2021, Volume 15, Issue 1,   Pages 53-69 doi: 10.1007/s11684-020-0748-y

Abstract: Epidemiologic studies have shown that a 10% increase in peak bone mass (PBM) at the population level

Keywords： peak bone mass     children     adolescents     genetic     risk factors    

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The carbon dioxide removal potential of Liquid Air Energy Storage: A high-level technical and economic appraisal

Andrew LOCKLEY, Ted von HIPPEL

Frontiers of Engineering Management 2021, Volume 8, Issue 3,   Pages 456-464 doi: 10.1007/s42524-020-0102-8

Abstract: Liquid Air Energy Storage (LAES) is at pilot scale. Air cooling and liquefaction stores energy; reheating revaporises the air at pressure, powering a turbine or engine (Ameel et al., 2013). Liquefaction requires water & CO removal, preventing ice fouling. This paper proposes subsequent geological storage of this CO – offering a novel Carbon Dioxide Removal (CDR) by-product, for the energy storage industry. It additionally assesses the scale constraint and economic opportunity offered by implementing this CDR approach. Similarly, established Compressed Air Energy Storage (CAES) uses air compression and subsequent expansion. CAES could also add CO scrubbing and subsequent storage, at extra cost. CAES stores fewer joules per kilogram of air than LAES – potentially scrubbing more CO per joule stored. Operational LAES/CAES technologies cannot offer full-scale CDR this century (Stocker et al., 2014), yet they could offer around 4% of projected CO disposals for LAES and<25% for current-technology CAES. LAES CDR could reach trillion-dollar scale this century (20 billion USD/year, to first order). A larger, less certain commercial CDR opportunity exists for modified conventional CAES, due to additional equipment requirements. CDR may be commercially critical for LAES/CAES usage growth, and the necessary infrastructure may influence plant scaling and placement. A suggested design for low-pressure CAES theoretically offers global-scale CDR potential within a century (ignoring siting constraints) – but this must be costed against competing CDR and energy storage technologies.

Keywords： carbon dioxide removal     Liquid Air Energy Storage     Compressed Air Energy Storage     geoengineering    

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The epidemiology of norovirus gastroenteritis in China: disease burden and distribution of genotypes

Honglu Zhou, Songmei Wang, Lorenz von Seidlein, Xuanyi Wang

Frontiers of Medicine 2020, Volume 14, Issue 1,   Pages 1-7 doi: 10.1007/s11684-019-0733-5

Abstract: With the improvements of sanitation and nationwide safe water supply the occurrence of bacterial diarrhea declined remarkably, while viruses became the leading causes of acute gastroenteritis (AGE). Of these viruses, noroviruses (NoVs) are responsible for a considerable burden of gastroenteritis, especially in children<2 years and elderly≥65 years. NoVs circulating in the Chinese population are antigenically highly diverse with the genotype GII.4 being the dominant strain followed by GII.3. Given the widespread contamination in environmental sources, and highly infectious nature of NoVs, vaccination would be the desirable strategy for the control of NoV infections. However, a better understanding of acquired immunity after infection, and a reliable immunological surrogate marker are urgently needed, since two vaccine candidates based on virus-like particles (VLPs) are currently moving into clinical evaluations in China.

Keywords： molecular epidemiology     norovirus     disease burden     genotype     China    

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Zero increase in peak discharge for sustainable development

Xing Fang, Junqi Li, Yongwei Gong, Xiaoning Li

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 4, doi: 10.1007/s11783-017-0935-5

Abstract: primarily pervious) are converted into impervious areas which lead to increases of runoff volume and peakMost of the developed countries require a zero increase in peak discharge for any land development, andThe policy of zero increase in peak discharge can be considered as historical and early stage for theWe promote and advocate the zero-increase policy on peak discharge for comprehensive stormwater management

Keywords： Stormwater management     Detention basin     Zero increase     Peak discharge     Sustainable development     Design rainfall    

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Control of peak pressures of an HCCI engine under varying swirl and operating parameters

T. KARTHIKEYA SHARMA,G. AMBA PRASAD RAO,K. MADHU MURTHY

Frontiers in Energy 2016, Volume 10, Issue 3,   Pages 337-346 doi: 10.1007/s11708-016-0401-2

Abstract: However, one of the major challenges with HCCI is the control of higher peak pressures which may damagepaper, an attempt is made to analyze computationally the effect of induction swirl in controlling the peakversion of SI and CI engines, the ECFM-3Z model with necessary modifications is used to analyze the peakexhaust gas recirculation (EGR) and equivalence ratio under different swirl ratios in controlling the peakThe results show that the swirl ratio has a considerable impact on controlling the peak pressures of

Keywords： HCCI engine     ECFM-3Z     Swirl ratio     peak pressures     engine speed     piston bowl geometry    

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Study of the Optimal Scheme for the Daily Operation of Northeastern Oil Pipeline Network Based on the Peak-valley

Cui Hui,Wu Changchun,Wu Jianglin,Sun Qingfeng

Strategic Study of CAE 2004, Volume 6, Issue 8,   Pages 69-73

Abstract: As for its operational actuality on the basis of the peak - valley price, the optimization of the dailySome fundamental rules for the optimization of the daily operation scheme based on the peak-valley price

Keywords： northeastern oil pipeline network     peak-valley price     daily operation     optimization    

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Peak CO

Sheng ZHOU, Maosheng DUAN, Zhiyi YUAN, Xunmin OU

Frontiers in Energy 2020, Volume 14, Issue 4,   Pages 740-758 doi: 10.1007/s11708-018-0558-y

Abstract: The results show that in the BAU scenario, the final energy consumption will peak at 25.93 million tonsIn the CMS scenario, the final energy will peak in 2020 at 23.47 Mtce (9% lower versus peak in the BAUIn the BAU scenario, CO emission will peak in 2025 at 70 million tons of carbon dioxide (MtCO ), andIn the CMS scenario, the peak has occurred in 2014, and 60 MtCO will be emitted in 2030.

Keywords： carbon dioxide emission     energy consumption     peak CO2 emission     low-carbon transition     Dezhou    

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A comprehensive simulator for assessing the reliability of a photovoltaic panel peak power tracking system

Nabil KAHOUL,Mourad HOUABES,Ammar NEÇAIBIA

Frontiers in Energy 2015, Volume 9, Issue 2,   Pages 170-179 doi: 10.1007/s11708-015-0353-y

Abstract: Therefore, it is a good substitute to help to test the peak power trackers of the PV system in the laboratoryThis paper describes a simple peak power trackers simulator of the PV system which has a short response

Keywords： photovoltaic module     DC-DC converter     design     maximum power point tracking (MPPT) card     microprocessor    

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An Empirical Study on China’s Energy Supply-and-Demand Model Considering Carbon Emission Peak Constraints

Jinhang Chen

Engineering 2017, Volume 3, Issue 4,   Pages 512-517 doi: 10.1016/J.ENG.2017.04.019

Abstract: rsquo;s energy supply-and-demand model and two related carbon emission scenarios, including a planned peakscenario and an advanced peak scenario, are designed taking into consideration China’s economicFinally, energy-related carbon emissions could peak in 2025 through the application of more efficientThe push toward decarbonization of the power industry is essential for reducing the peak value of carbon

Keywords： Carbon emission     Peak     Energy supply and demand     Model     Scenario    

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Energy Demand and Carbon Emission Peak Paths for the Rise of Central China

Cheng Yunhe, Dong Hongguang, Geng Jichao, He Jishan

Strategic Study of CAE 2021, Volume 23, Issue 1,   Pages 68-78 doi: 10.15302/J-SSCAE-2021.01.014

Abstract: achieve low-carbon emission, energy security, and efficient utilization of energy; a carbon emission peak

Keywords： energy revolution     rise of Central China     Kaya identity     scenario analysis     carbon emission peak    

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Title Author Date Type Operation

Investigating peak stresses in fitting and repair patches of buried polyethylene gas pipes

Reza KHADEMI ZAHEDI, Pouyan ALIMOURI, Hooman KHADEMI ZAHEDI, Mohammad SHISHESAZ

Journal Article

Transient analysis of thermoelastic contact problem of disk brakes

Ali BELHOCINE, Mostefa BOUCHETARA

Journal Article

Adaptive selective ES-FEM limit analysis of cracked plane-strain structures

H. NGUYEN-XUAN,T. RABCZUK

Journal Article

Epidemiological study of a von Hippel-Lindau family in northwest China

Jingyao Zhang, Dapeng Wu, Hong Ai, Jigang Bai, Shunbin Dong, Qinling Yang, Kai Qu, Lei Zhou, Xinsen Xu, Chang Liu

Journal Article

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

Journal Article

Factors influencing peak bone mass gain

Xiaowei Zhu, Houfeng Zheng

Journal Article

The carbon dioxide removal potential of Liquid Air Energy Storage: A high-level technical and economic appraisal

Andrew LOCKLEY, Ted von HIPPEL

Journal Article

The epidemiology of norovirus gastroenteritis in China: disease burden and distribution of genotypes

Honglu Zhou, Songmei Wang, Lorenz von Seidlein, Xuanyi Wang

Journal Article

Zero increase in peak discharge for sustainable development

Xing Fang, Junqi Li, Yongwei Gong, Xiaoning Li

Journal Article

Control of peak pressures of an HCCI engine under varying swirl and operating parameters

T. KARTHIKEYA SHARMA,G. AMBA PRASAD RAO,K. MADHU MURTHY

Journal Article

Study of the Optimal Scheme for the Daily Operation of Northeastern Oil Pipeline Network Based on the Peak-valley

Cui Hui,Wu Changchun,Wu Jianglin,Sun Qingfeng

Journal Article

Peak CO

Sheng ZHOU, Maosheng DUAN, Zhiyi YUAN, Xunmin OU

Journal Article

A comprehensive simulator for assessing the reliability of a photovoltaic panel peak power tracking system

Nabil KAHOUL,Mourad HOUABES,Ammar NEÇAIBIA

Journal Article

An Empirical Study on China’s Energy Supply-and-Demand Model Considering Carbon Emission Peak Constraints

Jinhang Chen

Journal Article

Energy Demand and Carbon Emission Peak Paths for the Rise of Central China

Cheng Yunhe, Dong Hongguang, Geng Jichao, He Jishan

Journal Article