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Hohmann transfer via constrained optimization None

Li XIE, Yi-qun ZHANG, Jun-yan XU

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 11,   Pages 1444-1458 doi: 10.1631/FITEE.1800295

Abstract: We next formulate the Hohmann transfer problem as boundary value problems, which are solved by the calculusof variations.

Keywords： Hohmann transfer     Nonlinear programming     Constrained optimization     Calculus of variations    

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Stability analysis of slopes with planar failure using variational calculus and numerical methods

Norly BELANDRIA, Roberto ÚCAR, Francisco M. LEÓN, Ferri HASSANI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 5,   Pages 1262-1273 doi: 10.1007/s11709-020-0657-9

Abstract: This study investigates the technique of variational calculus applied to estimate the slope stability

Keywords： slopes stability     planar failure     variational calculus     numerical methods    

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Effects of sulfur on variations in the chemical speciation of heavy metals from fly ash glass

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 10, doi: 10.1007/s11783-023-1728-7

Abstract:

● A higher sulfur content reduced the curing rate of Cr in glass.

Keywords： Dechlorinated fly ash     SO3     Heavy metal     Chemical speciation     Glass solidification    

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Genomic variations in the counterpart normal controls of lung squamous cell carcinomas

Dalin Zhang, Liwei Qu, Bo Zhou, Guizhen Wang, Guangbiao Zhou

Frontiers of Medicine 2018, Volume 12, Issue 3,   Pages 280-288 doi: 10.1007/s11684-017-0580-1

Abstract: However, few studies have investigated the genomic variations that occur only in normal tissues thatSixteen genomic variations were called in the three normal lung tissues.These variations were confirmed by Sanger capillary sequencing.A mean of 0.5661 exonic variations/Mb and 7.7887 altered genes per sample were identified in the CNCCNC variations in CTAGE5 and USP17L7 were associated with the poor

Keywords： lung cancer     counterpart normal control     genomic variations    

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Seasonal and treatment-process variations in invertebrates in drinking water treatment plants

Zhiling Wu, Xianchun Tang, Hongbin Chen

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 4, doi: 10.1007/s11783-020-1354-6

Abstract: Abstract • Seasonal and treatment-process variations in invertebrates in a DWTP were analyzed. • Thedrinking water treatment plant between May 2015 and April 2016 and analyzed seasonal and treatment-process variations

Keywords： Invertebrates     Drinking water     Seasonal variations     Treatment process    

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Bioaerosol emissions variations in large-scale landfill region and their health risk impacts

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 12, doi: 10.1007/s11783-022-1593-9

Abstract:

● The airborne bacteria in landfills were 4–50 times higher than fungi.

Keywords： Microbial aerosols     Landfill sites     Health risk assessment     CALPUFF    

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Investigations on color variations of Morpho rhetenor butterfly wing scales

Guanglan LIAO, Haibo ZUO, Xuan JIANG, Xuefeng YANG, Tielin SHI

Frontiers of Mechanical Engineering 2012, Volume 7, Issue 4,   Pages 394-400 doi: 10.1007/s11465-012-0347-y

Abstract:

Experiments and simulations are carried out to investigate the optical properties of butterfly wing scales. The upper surface of a male butterfly wing presents a single-layer of scales, the microstructures of which are responsible for the brilliant blue color. The color varies from cyan blue to yellow green and soon afterwards returns back to cyan blue when some ethanol is dropped on the upper surface. At the start of the ethanol volatilization process, the reflection spectrum remains stable. As the ethanol further volatilizes, the peak reflectance decreases slightly, then increases dramatically. Meanwhile, the peak wavelength keeps approximately constant, then decreases, and keeps almost stable at the end of the process. Therefore, the optical properties depend strongly on the varying ambient conditions, including the refractive index and the thickness of the packing medium. Moreover, the possible causes for the scales in dark green region after several dropping ethanol experiments are clarified. This research benefits our understanding of the color variation mechanisms of the wing scales, and provides inspiration for further studies and applications.

Keywords： Morpho rhetenor     microstructures     color variations     ambient medium    

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Modeling and Real-time Performance Analysis of Switched Ethernet by Network Calculus

Wang Xiaoxin,Liu Luyuan,Liu Jing,Ma Jinjue

Strategic Study of CAE 2006, Volume 8, Issue 6,   Pages 55-59

Abstract: Through analyzing the structure of classical switch, a switch model by network calculus is proposed,

Keywords： network calculus     switch     arrival curve     service curve     delay    

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Seasonal variations of transport pathways andpotential sources of PM

Yuan Chen, Shaodong Xie, Bin Luo

Frontiers of Environmental Science & Engineering 2018, Volume 12, Issue 1, doi: 10.1007/s11783-018-1009-z

Abstract: Seasonal pattern of transport pathways and potential sourcesof PM in Chengdu during 2012–2013were investigated based on hourly PM data,backward trajectories, clustering analysis, potential source contributionfunction (PSCF), and concentration-weighted trajectory (CWT) method.The annual hourly mean PM concentrationin Chengdu was 97.4 mg·m . 5, 5, 5 and 3 mean clusters were generatedin four seasons, respectively. Short-distance air masses, which travelledwithin the Sichuan Basin with no specific source direction and relativelyhigh PM loadings (>80 mg·m ) appearedas important pathways in all seasons. These short pathways indicatedthat emissions from both local and surrounding regions of Chengducontributed significantly to PM pollution.The cities in southern Chengdu were major potential sources with PSCF>0.6and CWT>90 mg·m . The northeastern pathway prevailed throughoutthe year with higher frequency in autumn and winter and lower frequencyin spring and summer. In spring, long-range transport from southernXinjiang was a representative dust invasion path to Chengdu, and theCWT values along the path were 30-60 mg·m . Long-range transportwas also observed in autumn from southeastern Xinjiang along a northwesterlypathway, and in winter from the Tibetan Plateau along a westerly pathway.In summer, the potential source regions of Chengdu were smaller thanthose in other seasons, and no long-range transport pathway was observed.Results of PSCF and CWT indicated that regions in Qinghai and Tibetcontributed to PM pollution in Chengdu aswell, and their CWT values increased to above 30 mg·m in winter.

Keywords： Transport pathway     Backwardtrajectory     Clustering analysis     Potential source     Chengdu    

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Spatio-temporal variations of water quality in Yuqiao Reservoir Basin, North China

Yuan XU,Ruqin XIE,Yuqiu WANG,Jian SHA

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 4,   Pages 649-664 doi: 10.1007/s11783-014-0702-9

Abstract: the water quality status of Yuqiao Reservoir Basin, North China, for assessing its spatio-temporal variationsTemp, pH, SS, T-har, DO, NO -N and TP were identified as significant variables affecting spatial variations, and Temp, pH and NO -N were identified as significant variables affecting temporal variations by discriminantFactor analysis identified four latent pollution sources for water quality variations: nutrient pollution

Keywords： Fuzzy comprehensive assessment     multivariate statistical analysis     water quality    

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Robust design approach to the minimization of functional performance variations of products and systems

J. ZHANG, H. DU, D. XUE, P. GU

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 2,   Pages 379-392 doi: 10.1007/s11465-020-0607-1

Abstract: Functional performance variations of products and systems are often used to measure the qualities ofA robust design approach has been developed in this research to minimize the functional performance variationsconsidering the design parameter uncertainties by identifying the boundaries of the functional performance variationsconfiguration, (2) the optimal values of design parameters, and (3) the boundaries of functional performance variations

Keywords： product design     robust design     design optimization     uncertainties    

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Genotype variations in accumulation of cadmium and lead in celery (

Kun ZHANG, Jianbing WANG, Zhongyi YANG, Guorong XIN, Jiangang YUAN, Junliang XIN, Charlie HUANG

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 1,   Pages 85-96 doi: 10.1007/s11783-012-0399-3

Abstract: To help reduce risks of heavy metal pollution, two pot experiments were conducted to investigate the variationsThese genotype variations in Cd accumulation are sufficiently large to help reduce Cd contamination risk

Keywords： cadmium (Cd) accumulation     lead (Pb) accumulation     celery     genotype variation     food safety    

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Seasonal variations in leaf capturing of particulate matter, surface wettability and micromorphology

Huixia WANG, Hui SHI, Yangyang LI, Ya YU, Jun ZHANG

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 4,   Pages 579-588 doi: 10.1007/s11783-013-0524-1

Abstract: was destroyed by mechanical and chemical abrasion, seemed to be the main factor leading to seasonal variations

Keywords： contact angle     particulate matter     retention amount    

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PASS - BDI Model for Software Agent

Fan Wei,Chen Zengqiang,Yuan Zhuzhi

Strategic Study of CAE 2004, Volume 6, Issue 6,   Pages 43-49

Abstract: model named as PASS-BDI, describes the mental states, cognitive processes and whole behaviors with pi-calculus

Keywords： agent     pi-calculus     cognitive processes     mental state    

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Rapid transaction to load variations of active filter supplied by PV system

M. BENADJA,S. SAAD,A. BELHAMRA

Frontiers in Energy 2014, Volume 8, Issue 3,   Pages 335-344 doi: 10.1007/s11708-014-0325-7

Abstract: This paper deals with the analysis and control of a photovoltaic (PV) system connected to the main supply through a Boost converter and shunt active filter supplied by a PV system providing continuous supply of nonlinear load in variation. A robust control of a PV system connected to the grid while feeding a variable nonlinear load is developed and highlighted. This development is based on the control of the Boost converter to extract the maximum power from the PV system using the Perturb and Observe (P and O) algorithm in the presence of temperature and illumination. The proposed modeling and control strategy provide power to the variable nonlinear load and facilitates the transfer of power from solar panel to the grid while improving the quality of energy (harmonic currents compensation, power factor compensation and dc bus voltage regulation). Validation of the developed model and control strategy is conducted using power system simulator Sim-Power System Blockset Matlab/Simulink. To demonstrate the effectiveness of the shunt active filter to load changes, the method of instantaneous power ( theory) is used to identify harmonic currents. The obtained results show an accurate extraction of harmonic currents and perfect compensation of both reactive power and harmonic currents with a lower THD and in accordance with the IEEE-519 standard.

Keywords： solar panels     maximum power point tracking (MPPT)     DC/DC converter (Boost)     shunt active filter     instantaneous power control     power quality     harmonics     imbalances     reactive energy    

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Title Author Date Type Operation

Hohmann transfer via constrained optimization

Li XIE, Yi-qun ZHANG, Jun-yan XU

Journal Article

Stability analysis of slopes with planar failure using variational calculus and numerical methods

Norly BELANDRIA, Roberto ÚCAR, Francisco M. LEÓN, Ferri HASSANI

Journal Article

Effects of sulfur on variations in the chemical speciation of heavy metals from fly ash glass

Journal Article

Genomic variations in the counterpart normal controls of lung squamous cell carcinomas

Dalin Zhang, Liwei Qu, Bo Zhou, Guizhen Wang, Guangbiao Zhou

Journal Article

Seasonal and treatment-process variations in invertebrates in drinking water treatment plants

Zhiling Wu, Xianchun Tang, Hongbin Chen

Journal Article

Bioaerosol emissions variations in large-scale landfill region and their health risk impacts

Journal Article

Investigations on color variations of Morpho rhetenor butterfly wing scales

Guanglan LIAO, Haibo ZUO, Xuan JIANG, Xuefeng YANG, Tielin SHI

Journal Article

Modeling and Real-time Performance Analysis of Switched Ethernet by Network Calculus

Wang Xiaoxin,Liu Luyuan,Liu Jing,Ma Jinjue

Journal Article

Seasonal variations of transport pathways andpotential sources of PM

Yuan Chen, Shaodong Xie, Bin Luo

Journal Article

Spatio-temporal variations of water quality in Yuqiao Reservoir Basin, North China

Yuan XU,Ruqin XIE,Yuqiu WANG,Jian SHA

Journal Article

Robust design approach to the minimization of functional performance variations of products and systems

J. ZHANG, H. DU, D. XUE, P. GU

Journal Article

Genotype variations in accumulation of cadmium and lead in celery (

Kun ZHANG, Jianbing WANG, Zhongyi YANG, Guorong XIN, Jiangang YUAN, Junliang XIN, Charlie HUANG

Journal Article

Seasonal variations in leaf capturing of particulate matter, surface wettability and micromorphology

Huixia WANG, Hui SHI, Yangyang LI, Ya YU, Jun ZHANG

Journal Article

PASS - BDI Model for Software Agent

Fan Wei,Chen Zengqiang,Yuan Zhuzhi

Journal Article

Rapid transaction to load variations of active filter supplied by PV system

M. BENADJA,S. SAAD,A. BELHAMRA

Journal Article