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Quasi-period Changes of the Operational Parameters for Hot Oil Pipelines

Cui Hui

Strategic Study of CAE 2006, Volume 8, Issue 1,   Pages 51-53

Abstract:

Subjected to the annual changes of the air temperature, the quasi-period rules of the operational

Keywords： hot oil pipeline     air temperature     soil environment     quasi-period    

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Free vibration analysis of cracked thin plates by quasi-convex coupled isogeometric-meshfree method

Hanjie ZHANG,Junzhao WU,Dongdong WANG

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 4,   Pages 405-419 doi: 10.1007/s11709-015-0310-1

Abstract: The free vibration analysis of cracked thin plates via a quasi-convex coupled isogeometric-meshfree methodvector simultaneously offers the consistent isogeometric-meshfree coupling in the coupled region and the quasi-convexThe quasi-convex meshfree shape functions mimic the isogeometric basis function as well as offer the

Keywords： meshfree method     isogeometric analysis     quasi-convex isogeometric-meshfree method     free vibration     cracked    

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Effect of UAV prewetting application during the flowering period of cotton on pesticide droplet deposition

Weixiang YAO, Xianju WANG, Yubin LAN, Ji JIN

Frontiers of Agricultural Science and Engineering 2018, Volume 5, Issue 4,   Pages 455-461 doi: 10.15302/J-FASE-2018232

Abstract: was studied, focusing on the effects of pesticide deposition on cotton leaves during the flowering period

Keywords： aerial spray     cotton     deposition     flowering period     leaf angle     prewetting     UAV    

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Rare-earth separation based on the differences of ionic magnetic moment via quasi-liquid strategy

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 10,   Pages 1584-1594 doi: 10.1007/s11705-022-2189-4

Abstract: effect, and finally the magnetic moment differences between paramagnetic and diamagnetic rare earths in quasi-liquidMagnetic separation via quasi-liquid system strategy provides a possibility of the novel, green, and

Keywords： rare earth element     different magnetic moment     magnetic separation     ionic liquid    

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A FEniCS implementation of the phase field method for quasi-static brittle fracture

HIRSHIKESH, Sundararajan NATARAJAN, Ratna Kumar ANNABATTULA

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2,   Pages 380-396 doi: 10.1007/s11709-018-0471-9

Abstract: In the recent years, the phase field method for simulating fracture problems has received considerable attention. This is due to the salient features of the method: 1) it can be incorporated into any conventional finite element software; 2) has a scalar damage variable is used to represent the discontinuous surface implicitly and 3) the crack initiation and subsequent propagation and branching are treated with less complexity. Within this framework, the linear momentum equations are coupled with the diffusion type equation, which describes the evolution of the damage variable. The coupled nonlinear system of partial differential equations are solved in a ‘staggered’ approach. The present work discusses the implementation of the phase field method for brittle fracture within the open-source finite element software, FEniCS. The FEniCS provides a framework for the automated solutions of the partial differential equations. The details of the implementation which forms the core of the analysis are presented. The implementation is validated by solving a few benchmark problems and comparing the results with the open literature.

Keywords： phase field method     FEniCS     brittle fracture     crack propagation     variational theory of fracture    

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Predictor-corrector algorithm for solving quasi-separated-flow and transient distributed-parameter model

Ping ZHANG, Guoliang DING

Frontiers in Energy 2010, Volume 4, Issue 4,   Pages 535-541 doi: 10.1007/s11708-010-0113-y

Abstract: The successive sub?stitution (SS) method is a suitable approach to solving the transient distributed-parameter model for heat exchangers. However, this method must be enhanced because its convergence heavily depends on the iterative initial pressure. When the iterative initial pressure is improperly assigned, the calculated flow rates become negative values, causing the state parameters to exhibit negative values as well. Therefore, a predictor-corrector algorithm (PCA) is proposed to improve the convergence of the SS method. A predictor is developed to determine an appropriate iterative initial pressure. Total fluid mass is adopted as the convergence criterion of pressure iteration instead of outlet flow rate as is done in the SS method. Convergence analysis and case study of the PCA and SS method are conducted, which show that the PCA has better convergence than the SS method under the same working conditions.

Keywords： algorithm     convergence     heat exchanger     modeling     transient    

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Using hydrochemical signatures to characterize the long-period evolution of groundwater information in

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 5, doi: 10.1007/s11783-021-1393-7

Abstract:

• The long-period groundwater evolution was identified by hydrochemical

Keywords： Groundwater quality     Hydrochemical signatures     Spatial-temporal variations     Water-rock interactions     Anthropogenic interventions    

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Mechanism design of reverse auction on concession period and generalized quality for PPP projects

Xianjia WANG, Shiwei WU

Frontiers of Engineering Management 2017, Volume 4, Issue 2,   Pages 156-170 doi: 10.15302/J-FEM-2017016

Abstract: PPP projects usually require the bid to specify several characteristics of quality and the concession periodmodel of a PPP project can be replaced by a two-dimensional direct mechanism based on the concession period

Keywords： PPP project     reverse auction     mechanism design     multidimensional information     scoring function     two-stage bidding    

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Peridynamics versus XFEM: a comparative study for quasi-static crack problems

Jinhai ZHAO, Hesheng TANG, Songtao XUE

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 4,   Pages 548-557 doi: 10.1007/s11709-017-0434-6

Abstract: Peridynamics (PD) is a nonlocal continuum theory based on integro-differential equations without spatial derivatives. The fracture criterion is implicitly incorporated in the PD theory and fracture is a natural outcome of the simulation. However, capturing of complex mixed-mode crack patterns has been proven to be difficult with PD. On the other hand, the extended finite element method (XFEM) is one of the most popular methods for fracture which allows crack propagation with minimal remeshing. It requires a fracture criterion which is independent of the underlying discretization though a certain refinement is needed in order to obtain suitable results. This article presents a comparative study between XFEM and PD. Therefore, two examples are studied. The first example is crack propagation in a double notched specimen under uniaxial tension with different crack spacings in loading direction. The second example is the specimens with two center cracks. The results show that PD as well as XFEM are well suited to capture this type of behaviour.

Keywords： XFEM     peridynamic     bilateral crack     parallel double cracks     nonlocal theory    

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Featurematching using quasi-conformalmaps Article

Chun-xue WANG, Li-gang LIU

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 5,   Pages 644-657 doi: 10.1631/FITEE.1500411

Abstract: can be formulated as a constrained optimization involving both the Beltrami coefficient (BC) term and quasi-conformal

Keywords： Feature correspondence     Quasi-conformal map     Splitting method    

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A novel period estimation method for X-ray pulsars based on frequency subdivision

Li-rong SHEN,Xiao-ping LI,Hai-feng SUN,Hai-yan FANG,Meng-fan XUE

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 10,   Pages 858-870 doi: 10.1631/FITEE.1500052

Abstract: Period estimation of X-ray pulsars plays an important role in X-ray pulsar based navigation (XPNAV).The fast Lomb periodogram is suitable for period estimation of X-ray pulsars, but its performance infrequency subdivision and the continuous Lomb periodogram (CLP) is proposed to improve precision of periodFinally, a refined period is achieved by calculating the CLP in the obtained frequencies.Furthermore, the proposed method performs better than efsearch (a period estimation method of HEAsoft

Keywords： Pulsar navigation     Period estimation     Frequency subdivision     Continuous Lomb periodogram    

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Experimental research on the multilayer compartmental particle damper and its application methods on long-period

Zhenyuan LUO, Weiming YAN, Weibing XU, Qinfei ZHENG, Baoshun WANG

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 4,   Pages 751-766 doi: 10.1007/s11709-018-0509-z

Abstract: To introduce particle damping technology to long-period structure seismic control, a novel multilayercompartmental particle damper (MCPD) was proposed, and a 1/20 scale test model of a typical long-periodThe results showed that the seismic responses of the flexible or semi-flexible bridge towers of long-periodA well-designed MCPD can achieve significant damping for long-period structures under seismic excitationsapplication of MCPDs for seismic control of single-tower self-anchored suspension bridges and other long-period

Keywords： multilayer compartmental particle damper     self-anchored suspension bridges     shaking tables test     long-period    

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Russian school of the theory and geometry of gearing: Its origin and golden period (1935 --1975)

Dmitry BABICHEV,Sergey LAGUTIN,Natalya BARMINA

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 1,   Pages 44-59 doi: 10.1007/s11465-015-0360-z

Abstract: This paper also includes a review of more than 160 papers in Russian for the period of 1935–1975The main features and achievements during this period are also considered.The diagrams also show the following aspects: 1) The most popular and important themes in a specific period

Keywords： theory of gearing (TG)     gear geometry     generating surface     gear synthesis     gear analysis    

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Short-term effect of temperature variation on the competition between PAOs and GAOs during acclimation period

Nanqi REN, Han KANG, Xiuheng WANG, Nan LI

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 2,   Pages 277-282 doi: 10.1007/s11783-010-0226-x

Abstract: Sequencing batch reactor (SBR) for enhanced biological phosphorus removal (EBPR) processes was used to investigate the impact of the temperature shock on the competition between phosphorus-accumulating organisms (PAOs) and glycogen accumulating organisms (GAOs) in start-up stage. During the 34 days operation, SBR was set with temperature variation(0–5 d, 22±1°C; 6–13 d, 29±1°C; 14–34 d, 14±1°C). PAOs and GAOs were analyzed by fluorescent in situ hybridization (FISH), and intracellular polyphosphate granules were stained by Neisser-stain. The results showed that the influence of temperature shock on PAOs’ abundance was more serious than that on GAOs in the enriching process. Under sudden and substantially temperature variation, from 22±1°C to 29±1°C and then to 14±1°C, the domination of PAOs was deteriorated. After temperature shock, PAOs’ competitive advantages at low temperature that concluded in other study did not appear in our study. As mesophilic, GAOs (indicated by and ) were more temperature adaptive and better grew and took the domination at 14±1°C in the end. In the competition process, organisms of tetrad forming organisms (TFOs)-like shape which were considered as typical GAOs, were observed. With the evidence of poly-P granules containing by Neisser-straining and result of FISH, these organisms of TFOs-like shape were better to be assumed as adaption state or a special self-protecting shape of PAOs.

Keywords： fluorescent in situ hybridization (FISH)     tetrad forming organisms (TFOs)     temperature variation     enhanced biological phosphorus removal (EBPR)    

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analysis in conventional and organic rice production systems and organic scenarios in the transition period

Hamed MANSOORI, Parviz Rezvani MOGHADDAM, Rooholla MORADI

Frontiers in Energy 2012, Volume 6, Issue 4,   Pages 341-350 doi: 10.1007/s11708-012-0206-x

Abstract: scenarios were designed to predict the changes of energy budget and economic analysis in the transition periodIncrease in energy efficiency and productivity was predicted for the transition period but decrease trendin economic indexes was projected for this period in all scenarios.was that the market price of organic rice was the same as that of conventional rice in the transition period

Keywords： energy efficiency     specific energy     net return     Cobb-Douglas function    

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Title Author Date Type Operation

Quasi-period Changes of the Operational Parameters for Hot Oil Pipelines

Cui Hui

Journal Article

Free vibration analysis of cracked thin plates by quasi-convex coupled isogeometric-meshfree method

Hanjie ZHANG,Junzhao WU,Dongdong WANG

Journal Article

Effect of UAV prewetting application during the flowering period of cotton on pesticide droplet deposition

Weixiang YAO, Xianju WANG, Yubin LAN, Ji JIN

Journal Article

Rare-earth separation based on the differences of ionic magnetic moment via quasi-liquid strategy

Journal Article

A FEniCS implementation of the phase field method for quasi-static brittle fracture

HIRSHIKESH, Sundararajan NATARAJAN, Ratna Kumar ANNABATTULA

Journal Article

Predictor-corrector algorithm for solving quasi-separated-flow and transient distributed-parameter model

Ping ZHANG, Guoliang DING

Journal Article

Using hydrochemical signatures to characterize the long-period evolution of groundwater information in

Journal Article

Mechanism design of reverse auction on concession period and generalized quality for PPP projects

Xianjia WANG, Shiwei WU

Journal Article

Peridynamics versus XFEM: a comparative study for quasi-static crack problems

Jinhai ZHAO, Hesheng TANG, Songtao XUE

Journal Article

Featurematching using quasi-conformalmaps

Chun-xue WANG, Li-gang LIU

Journal Article

A novel period estimation method for X-ray pulsars based on frequency subdivision

Li-rong SHEN,Xiao-ping LI,Hai-feng SUN,Hai-yan FANG,Meng-fan XUE

Journal Article

Experimental research on the multilayer compartmental particle damper and its application methods on long-period

Zhenyuan LUO, Weiming YAN, Weibing XU, Qinfei ZHENG, Baoshun WANG

Journal Article

Russian school of the theory and geometry of gearing: Its origin and golden period (1935 --1975)

Dmitry BABICHEV,Sergey LAGUTIN,Natalya BARMINA

Journal Article

Short-term effect of temperature variation on the competition between PAOs and GAOs during acclimation period

Nanqi REN, Han KANG, Xiuheng WANG, Nan LI

Journal Article

analysis in conventional and organic rice production systems and organic scenarios in the transition period

Hamed MANSOORI, Parviz Rezvani MOGHADDAM, Rooholla MORADI

Journal Article