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A New Real-time Detecting Method for Harmonic Current Based on Iterative Algorithm in Active Power Filter

Li Zicheng,Sun Yukun

Strategic Study of CAE 2006, Volume 8, Issue 1,   Pages 46-50

Abstract: Based on the foundation of load current analysis, a new real-time detecting method for harmonic current

Keywords： active power filter     harmonics current     active current     reactive current    

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Effect of harmonic distortion on electric energy meters of different metrological principles

Illia DIAHOVCHENKO, Vitalii VOLOKHIN, Victoria KUROCHKINA, Michal ŠPES, Michal KOSTEREC

Frontiers in Energy 2019, Volume 13, Issue 2,   Pages 377-385 doi: 10.1007/s11708-018-0571-1

Abstract: electric energy metering devices as a result of distortions in the shape of the curves of voltage and current

Keywords： current     distortion     electric energy meter     harmonics     power quality    

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Unified power quality conditioner based on a three-level NPC inverter using fuzzy control techniques for all voltage disturbances compensation

Salim CHENNAI,M-T BENCHOUIA

Frontiers in Energy 2014, Volume 8, Issue 2,   Pages 221-239 doi: 10.1007/s11708-014-0317-7

Abstract: The proposed UPQC is capable of mitigating source current harmonics and compensate all voltage disturbancessuch as voltage sags, swells, unbalances and harmonics.the proposed UPQC system are evaluated in terms of power factor correction, mitigation of voltage or currentharmonics and all other voltage disturbances compensation using Matlab-Simulink software and SimPowerSystem

Keywords： three-level neutral point clamped (NPC) inverter     unified power quality conditioner (UPQC)     current harmonics    

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Effect of current density on groundwater arsenite removal performance using air cathode electrocoagulation

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 6, doi: 10.1007/s11783-021-1399-1

Abstract:

• With the same charge, current density had little effect on As(III)

Keywords： Electrocoagulation     Air cathode     Arsenic     Current density     Energy consumption    

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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： tracking (MPPT)     DC/DC converter (Boost)     shunt active filter     instantaneous power control     power quality     harmonics    

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EGG PRODUCTION IN CHINA: CURRENT STATUS AND OUTLOOK

Ning YANG

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 1,   Pages 25-34 doi: 10.15302/J-FASE-2020363

Abstract: Eggs are one of the most nutritious and affordable animal products worldwide. From 1985, egg production in China has retained the leading place in the world. A total of 33 Mt of eggs were produced in 2019 representing ˃ 40% of the world total production. Egg production in China is characterized by diversity in several aspects, including layer breeds, products and production systems. New breeds and synthetic lines are developed to improve the genetic potentials of egg production and feed efficiency of layers. In the past, layer farms were run mostly by small households with 100 to 1000 layers per farm. Over the past decades, egg production in China has developed toward standardization and expansion of production systems, and many of these modern intensive farms raise millions of layers. Although the Chinese egg products maintain strong competitiveness over other animal products and imported egg products, the egg industry will grow at a slower pace compared to the past. Chinese consumers are more concerned about the quality and safety of eggs and egg products, as well as the environmental issues related to animal production, which presents challenges for the Chinese egg industry.

Keywords： poultry farms     China     diversity     egg production     trends    

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EGG PRODUCTION IN CHINA: CURRENT STATUS AND OUTLOOK

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 1,   Pages 25-34

Abstract:

• China is now the largest egg production country worldwide

• Egg production in China is characterized by diversity in several aspects

• China is now capable of breeding new varieties, with more than 50% of the market share

• Policies have been implemented to ensure sustainable development of egg production

• Integrating crop-chicken-vegetable production system is established

 

Eggs are one of the most nutritious and affordable animal products worldwide. From 1985, egg production in China has retained the leading place in the world. A total of 33 Mt of eggs were produced in 2019 representing ˃ 40% of the world total production. Egg production in China is characterized by diversity in several aspects, including layer breeds, products and production systems. New breeds and synthetic lines are developed to improve the genetic potentials of egg production and feed efficiency of layers. In the past, layer farms were run mostly by small households with 100 to 1000 layers per farm. Over the past decades, egg production in China has developed toward standardization and expansion of production systems, and many of these modern intensive farms raise millions of layers. Although the Chinese egg products maintain strong competitiveness over other animal products and imported egg products, the egg industry will grow at a slower pace compared to the past. Chinese consumers are more concerned about the quality and safety of eggs and egg products, as well as the environmental issues related to animal production, which presents challenges for the Chinese egg industry.

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New method to determine optimum impedance of fault current limiters for symmetrical and/or asymmetrical None

Mahmoud MODARESI, Hamid LESANI

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 2,   Pages 297-307 doi: 10.1631/FITEE.1601689

Abstract: To select the type and value of the impedance of fault current limiters (FCLs) for power network designersoptimization of FCL impedance is based on a goal function that maximizes the reduction of the fault current

Keywords： Fault current limiter (FCL)     FCL impedance     Short circuit current     Fault current     Power system    

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Current situation and development of wind power in China

BAO Nengsheng, NI Weidou

Frontiers in Energy 2007, Volume 1, Issue 4,   Pages 371-383 doi: 10.1007/s11708-007-0056-4

Abstract: The current development of wind power in China was presented in this paper.

Keywords： Xinjiang     current development     Mongolia Autonomous     southeast coastal     Autonomous    

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Circumcision of preschool boys in Baghdad, Iraq: prevalence, current practice and complications

Hussein Naji, Rajaa Mustafa

Frontiers of Medicine 2013, Volume 7, Issue 1,   Pages 122-125 doi: 10.1007/s11684-013-0242-x

Abstract: study is to assess the prevalence of circumcision in preschool boys and to present an overview of the current

Keywords： circumcision     children     prevalence     religious     complications    

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Numerical modeling of current-induced scour around multi-wall foundation using large-eddy simulation

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 4,   Pages 546-565 doi: 10.1007/s11709-023-0943-4

Abstract: Scouring is one of the primary triggers of failure for bridges across rivers or seas. However, research concerning the scour mechanism of multi-wall foundations (MWFs) remains scarce, hindering the further application of MWFs. In this study, for the first time, the scouring effect caused by unidirectional flow around MWFs was examined numerically using FLOW-3D involving a large-eddy simulation. Initially, the applicability of the scouring model and input parameters was validated using a case study based on published measured data. Subsequently, the scouring effects of four MWFs with different wall arrangements and inflow angles, including the flow field analysis and scour pit and depth, were investigated thoroughly. It was found that the maximum scour depth of MWFs with an inflow angle of 0° was smaller than that of those with an inflow angle of 45°, regardless of the wall arrangement. Meanwhile, changing the inflow angle significantly affects the scour characteristics of MWFs arranged in parallel. In practical engineering, MWFs arranged in parallel are preferred considering the need for scouring resistance. However, a comparative analysis should be performed to consider comprehensively whether to adopt the form of a round wall arrangement when the inflow angle is not 0° or the inflow direction is changeable.

Keywords： multi-wall foundation     current-induced scour     bridge foundation     large-eddy simulation     numerical analysis    

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Effect of counter current gas phase on liquid film

Shujuan LUO, Huaizhi LI, Weiyang FEI, Yundong WANG

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 2,   Pages 135-137 doi: 10.1007/s11705-009-0129-1

Abstract: The effect of counter current gas phase on the liquid film was taken into consideration.by 57% because of increasing liquid flow rate, while it decreased by 25% resulting from the counter current

Keywords： counter current     liquid film     two phases     structured packings    

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Fault tolerant control strategy for modular PWM current source inverter

Frontiers in Energy 2023, Volume 17, Issue 2,   Pages 228-238 doi: 10.1007/s11708-022-0852-6

Abstract: fault-tolerant control method for an input-series output-parallel modular grid-tied pulse-width modulation (PWM) currentThis method actively offsets the neutral point of the current space vector to ensure a sinusoidal outputof the grid current, and it can achieve the upper limit power of the inverter under the condition ofIn addition, an active damping control method based on grid harmonic current feedback is proposed aftersuppresses the resonance caused by the transformer and the modified modulation, improving the grid current

Keywords： current source converter (CSC)     fault-tolerant control     space vector modulation     active damping     resonance    

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Catalysis of semihydrogenation of acetylene to ethylene: current trends, challenges, and outlook

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 7,   Pages 1031-1059 doi: 10.1007/s11705-021-2113-3

Abstract: Ethylene is an important feedstock for various industrial processes, particularly in the polymer industry. Unfortunately, during naphtha cracking to produce ethylene, there are instances of acetylene presence in the product stream, which poisons the Ziegler–Natta polymerization catalysts. Thus, appropriate process modification, optimization, and in particular, catalyst design are essential to ensure the production of highly pure ethylene that is suitable as a feedstock in polymerization reactions. Accordingly, carefully selected process parameters and the application of various catalyst systems have been optimized for this purpose. This review provides a holistic view of the recent reports on the selective hydrogenation of acetylene. Previously published reviews were limited to Pd catalysts. However, effective new metal and non-metal catalysts have been explored for selective acetylene hydrogenation. Updates on this recent progress and more comprehensive computational studies that are now available for the reaction are described herein. In addition to the favored Pd catalysts, other catalyst systems including mono, bimetallic, trimetallic, and ionic catalysts are presented. The specific role(s) that each process parameter plays to achieve high acetylene conversion and ethylene selectivity is discussed. Attempts have been made to elucidate the possible catalyst deactivation mechanisms involved in the reaction. Extensive reports suggest that acetylene adsorption occurs through an active single-site mechanism rather than via dual active sites. An increase in the reaction temperature affords high acetylene conversion and ethylene selectivity to obtain reactant streams free of ethylene. Conflicting findings to this trend have reported the presence of ethylene in the feed stream. This review will serve as a useful resource of condensed information for researchers in the field of acetylene-selective hydrogenation.

Keywords： selectivity     hydrogenation     acetylene     ethylene     palladium    

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Role of Akkermansia muciniphila in the development of nonalcoholic fatty liver disease: current knowledge

Frontiers of Medicine 2022, Volume 16, Issue 5,   Pages 667-685 doi: 10.1007/s11684-022-0960-z

Abstract: Here, the current knowledge on the role of A. muciniphila in the progression of NAFLD was summarized

Keywords： Akkermansia muciniphila     NAFLD     NASH     steatosis     inflammation    

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Title Author Date Type Operation

A New Real-time Detecting Method for Harmonic Current Based on Iterative Algorithm in Active Power Filter

Li Zicheng,Sun Yukun

Journal Article

Effect of harmonic distortion on electric energy meters of different metrological principles

Illia DIAHOVCHENKO, Vitalii VOLOKHIN, Victoria KUROCHKINA, Michal ŠPES, Michal KOSTEREC

Journal Article

Unified power quality conditioner based on a three-level NPC inverter using fuzzy control techniques for all voltage disturbances compensation

Salim CHENNAI,M-T BENCHOUIA

Journal Article

Effect of current density on groundwater arsenite removal performance using air cathode electrocoagulation

Journal Article

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

M. BENADJA,S. SAAD,A. BELHAMRA

Journal Article

EGG PRODUCTION IN CHINA: CURRENT STATUS AND OUTLOOK

Ning YANG

Journal Article

EGG PRODUCTION IN CHINA: CURRENT STATUS AND OUTLOOK

Journal Article

New method to determine optimum impedance of fault current limiters for symmetrical and/or asymmetrical

Mahmoud MODARESI, Hamid LESANI

Journal Article

Current situation and development of wind power in China

BAO Nengsheng, NI Weidou

Journal Article

Circumcision of preschool boys in Baghdad, Iraq: prevalence, current practice and complications

Hussein Naji, Rajaa Mustafa

Journal Article

Numerical modeling of current-induced scour around multi-wall foundation using large-eddy simulation

Journal Article

Effect of counter current gas phase on liquid film

Shujuan LUO, Huaizhi LI, Weiyang FEI, Yundong WANG

Journal Article

Fault tolerant control strategy for modular PWM current source inverter

Journal Article

Catalysis of semihydrogenation of acetylene to ethylene: current trends, challenges, and outlook

Journal Article

Role of Akkermansia muciniphila in the development of nonalcoholic fatty liver disease: current knowledge

Journal Article