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Dynamic contribution of variable-speed wind energy conversion system in system frequency regulation

Yajvender Pal VERMA, Ashwani KUMAR

Frontiers in Energy 2012, Volume 6, Issue 2,   Pages 184-192 doi: 10.1007/s11708-012-0185-y

Abstract: Frequency regulation in a generation mix having large wind power penetration is a critical issue, asThus, it is important that wind turbines also contribute to system frequency control.the short term transient active power support to the grid during transients and arrests the fall in frequencyThe frequency deviation is considered by the controller to provide the inertial control.The optimal speed control parameters have been used for the DFIG to increases its participation in frequency

Keywords: doubly fed induction generator (DFIG)     load frequency control     inertial control     wind energy conversion    

Study on enzymatic hydrolysis of steam exploded straw by using shaking ball

SUN Zhanwei, FU Xiaoguo, CHEN Hongzhang, WANG Yanhui, MA Runyu

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 1,   Pages 22-27 doi: 10.1007/s11705-008-0002-7

Abstract: A novel method of enzymatic hydrolysis was developed in this paper to produce a high conversion yieldThe results showed that the method of shaking ball produced the highest adsorption, conversion yieldsThis might be due to the continuous frequency increase of enzyme adsorption and desorption on the substrate

Keywords: adequate filter-paper     comparison     conversion     continuous frequency     substrate    

Special issue on electrochemical conversion and utilization of hydrogen energy

Frontiers in Energy 2024, Volume 18, Issue 3,   Pages 263-264 doi: 10.1007/s11708-024-0944-6

Abstract: Special issue on electrochemical conversion and utilization of hydrogen energy

Keywords: hydrogen energy    

Hydrogel photocatalysts for efficient energy conversion and environmental treatment

Frontiers in Energy 2021, Volume 15, Issue 3,   Pages 577-595 doi: 10.1007/s11708-021-0756-x

Abstract: Moreover, current applications of hydrogel photocatalysts in energy conversion and environmental remediation

Keywords: hydrogel     photocatalysts     energy conversion     environmental treatment    

Research on non-grid-connected wind power daily million tons seawater desalination system using single fan

Shi Jianzhong

Strategic Study of CAE 2015, Volume 17, Issue 3,   Pages 35-40

Abstract:

To alleviate the current situation of our country for lack of fresh water, seawater desalination has become a major research direction. According to traditional desalination is high energy-consuming industries, and uses conventional energy, which could easily lead to secondary pollution for environment, a seawater desalination system using non-grid-connected multi-energy collaborative supply is proposed in this article. The system bases on non-grid-connected theory, wind, light, tidal and other green energy is utilized to power seawater desalination system, which can improve the efficiency of energy use and achieve zero emissions of carbon dioxide. The system possesses good social and economic benefits. This paper designs and develops a?set of?single blower?daily?million tons of?seawater desalination system, using a?2.5 MW?wind turbines of this?system?for seawater desalination?and power supply system,?based on the theory of?non-grid-connected wind power,?achieving?high efficiency and low cost,?full?utilization.

Keywords: non-grid-connected; wind grid complementary; multi-energy collaborative; seawater desalination; frequencyconversion    

Biological conversion pathways of sulfate reduction ammonium oxidation in anammox consortia

Zhen Bi, Deqing Wanyan, Xiang Li, Yong Huang

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 3, doi: 10.1007/s11783-019-1217-1

Abstract: AOB and AnAOB are mainly responsible for ammonium conversion.Heterotrophic sulfate reduction mainly contributed to sulfate conversion.Results obtained differed largely for the conversion mole ratios (ammonium/sulfate), and even the intermediateThus, the hypothesis of biological conversion pathways of ammonium and sulfate in anammox consortia isdifferent biomass proportions to verify the SRAO phenomena and identify possible pathways behind substrate conversion

Keywords: Anammox bacteria     Autotrophic     Biological conversion     Sulfate reducing ammonium oxidation (SRAO)    

Sustainable conversion regenerated cellulose into cellulose oleate by sonochemistry

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 8,   Pages 1096-1108 doi: 10.1007/s11705-023-2317-9

Abstract: Derivatization has great potential for the high-value utilization of cellulose by enhancing its processability and functionality. However, due to the low reactivity of natural cellulose, it remains challenging to rapidly prepare cellulose derivatives with high degrees of substitution. The “cavitation effect” of ultrasound can reduce the particle size and crystalline index of cellulose, which provides a possible method for preparing cellulose derivatives. Herein, a feasible method was proposed for efficiently converting regenerated cellulose to cellulose oleate with the assistance of ultrasonic treatment. By adjusting the reaction conditions including ultrasonic intensity, feeding ratios of oleic acid, reaction time, and reaction solvent, a series of cellulose oleates with degrees of substitution ranging from 0.37 to 1.71 were synthesized. Additionally, the effects of different reaction conditions on the chemical structures, crystalline structures, and thermal behaviors were investigated thoroughly. Cellulose oleates with degrees of substitution exceeding 1.23 exhibited amorphous structures and thermoplasticity with glass transition temperatures at 159.8 to 172.6 °C. This study presented a sustainable and practicable method for effectively derivatizing cellulose.

Keywords: regenerated cellulose     cellulose oleate     sonochemistry     degree of substitution     thermoplasticity    

Micro/nanofluidics-enabled energy conversion and its implemented devices

Yang YANG, Jing LIU

Frontiers in Energy 2011, Volume 5, Issue 3,   Pages 270-287 doi: 10.1007/s11708-010-0126-6

Abstract: The fluids in nature serve as the most common carriers and media in the energy conversion process.Following the rapid development of microelectromechanical systems (MEMS) technology, the energy supply and conversionIn this paper, a series of micro/nanofluid-enabled energy conversion devices is reviewed based on theto the establishment of a comprehensive and systematic structure in the relationship between energy conversion

Keywords: micro/nanofluid     different energy forms     energy conversion     medium role    

A review on front end conversion in ocean wave energy converters

Nagulan SANTHOSH,Venkatesan BASKARAN,Arunachalam AMARKARTHIK

Frontiers in Energy 2015, Volume 9, Issue 3,   Pages 297-310 doi: 10.1007/s11708-015-0370-x

Abstract: of the wave energy converter among other stages such as power take off (PTO) and electrical energy conversionIf the recent development of these front end energy conversion is well known then developing wave energyThe aim of this review is to provide information on front end energy conversion of a point absorber and

Keywords: wave energy converter     point absorbers     power take off (PTO)     front end energy conversion    

Standard-independent I/Q imbalance estimation and compensation scheme inOFDM direct-conversion transceivers None

Fang-lin GU, Shan WANG, Wen-wu WANG

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 3,   Pages 388-397 doi: 10.1631/FITEE.1700003

Abstract: Direct-conversion transceivers are gaining increasing attention due to their low power consumption.In this paper, we first investigate the effects of I/Q imbalance on orthogonal frequency division multiplexingdistortion, is used to estimate the I/Q imbalance parameters, and then the I/Q imbalance is corrected in the frequency

Keywords: In- and quadrature-phase (I/Q) imbalance     Orthogonal frequency division multiplexing (OFDM)     Standard-independent    

Special issue on electrochemical energy storage and conversion

Frontiers in Energy 2024, Volume 18, Issue 2,   Pages 125-127 doi: 10.1007/s11708-024-0942-8

Abstract: Special issue on electrochemical energy storage and conversion

Keywords: conversion    

Conversion of polyethylene to gasoline: Influence of porosity and acidity of zeolites

Frontiers in Energy 2023, Volume 17, Issue 6,   Pages 763-774 doi: 10.1007/s11708-023-0897-1

Abstract: Zeolites are cheap and stable, but they are usually not efficient for plastic conversion at a low temperaturewere used to study the influence of porosity and acidity of zeolite on catalytic activity for plastics conversionThis study provides very useful information for designing zeolites for efficient conversion of plastics

Keywords: plastics conversion     polyethylene     zeolites     acidity     porosity    

Gold modified cobalt-based Fischer-Tropsch catalysts for conversion of synthesis gas to liquid fuels

Alan J. McCue, Jura Aponaviciute, Richard P.K. Wells, James A. Anderson

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 3,   Pages 262-269 doi: 10.1007/s11705-013-1334-5

Abstract: The addition of Au as a promoter/modifier for alumina supported Co catalyst has been studied by combined high temperature, high pressure Fourier transform infrared (FTIR) and on-line gas chromatography. The combination of these tools permitted the state of the active catalyst surface to be monitored while following the elution of reaction products during the first 5–7 h on stream of the catalyst. The catalysts under study were a 10%Co/Al O and a 2.5%Au/10%Co/Al O Samples were characterised before use using Raman and temperature programmed reduction (TPR). During the initial stages of reaction, hydrocarbons were built up on the surface of the catalyst as monitored by FTIR and the nature and amount of these species were assessed in terms of CH /CH ratio and the density of these alkyl fragments by employing absorption coefficients for the individual components. The nature and reducibility of the Co particles were modified by the presence of Au while the later also shifted the CO/H balance by acting as an effective water-gas shift catalyst during the early stages of reaction. This characteristic was lost during reaction as a consequence of redistribution of the two metallic phases.

Keywords: gold modified catalyst     conversion of synthesis gas    

Co anchored on porphyrinic triazine-based frameworks with excellent biocompatibility for conversion of

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 12,   Pages 1761-1771 doi: 10.1007/s11705-022-2195-6

Abstract: Microbial electrosynthesis is a promising alternative to directly convert CO2 into long-chain compounds by coupling inorganic electrocatalysis with biosynthetic systems. However, problems arose that the conventional electrocatalysts for hydrogen evolution may produce extensive by-products of reactive oxygen species and cause severe metal leaching, both of which induce strong toxicity toward microorganisms. Moreover, poor stability of electrocatalysts cannot be qualified for long-term operation. These problems may result in poor biocompatibility between electrocatalysts and microorganisms. To solve the bottleneck problem, Co anchored on porphyrinic triazine-based frameworks was synthesized as the electrocatalyst for hydrogen evolution and further coupled with Cupriavidus necator H16. It showed high selectivity for a four-electron pathway of oxygen reduction reaction and low production of reactive oxygen species, owing to the synergistic effect of Co–Nx modulating the charge distribution and adsorption energy of intermediates. Additionally, low metal leaching and excellent stability were observed, which may be attributed to low content of Co and the stabilizing effect of metalloporphyrins. Hence, the electrocatalyst exhibited excellent biocompatibility. Finally, the microbial electrosynthesis system equipped with the electrocatalyst successfully converted CO2 to poly-β-hydroxybutyrate. This work drew up a novel strategy for enhancing the biocompatibility of electrocatalysts in microbial electrosynthesis system.

Keywords: electrosynthesis     hydrogen evolution reaction     metalloporphyrins     biocompatibility     CO2 conversion    

A frequency error estimation for isogeometric analysis of Kirchhoff–Love cylindrical shells

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 10,   Pages 1599-1610 doi: 10.1007/s11709-023-0006-x

Abstract: A frequency error estimation is presented for the isogeometric free vibration analysis of Kirchhoff–LoveBy analyzing the discrete isogeometric equations with the aid of harmonic wave assumption, the frequencyIn particular, the governing relationship of the continuum frequency for Kirchhoff–Love cylindrical shellsis naturally embedded into the frequency error measures without the need of explicit frequency expressionsNumerical results not only thoroughly verify the theoretical convergence rates of frequency solutions

Keywords: isogeometric analysis     Kirchhoff–Love cylindrical shell     free vibration     frequency error     convergence    

Title Author Date Type Operation

Dynamic contribution of variable-speed wind energy conversion system in system frequency regulation

Yajvender Pal VERMA, Ashwani KUMAR

Journal Article

Study on enzymatic hydrolysis of steam exploded straw by using shaking ball

SUN Zhanwei, FU Xiaoguo, CHEN Hongzhang, WANG Yanhui, MA Runyu

Journal Article

Special issue on electrochemical conversion and utilization of hydrogen energy

Journal Article

Hydrogel photocatalysts for efficient energy conversion and environmental treatment

Journal Article

Research on non-grid-connected wind power daily million tons seawater desalination system using single fan

Shi Jianzhong

Journal Article

Biological conversion pathways of sulfate reduction ammonium oxidation in anammox consortia

Zhen Bi, Deqing Wanyan, Xiang Li, Yong Huang

Journal Article

Sustainable conversion regenerated cellulose into cellulose oleate by sonochemistry

Journal Article

Micro/nanofluidics-enabled energy conversion and its implemented devices

Yang YANG, Jing LIU

Journal Article

A review on front end conversion in ocean wave energy converters

Nagulan SANTHOSH,Venkatesan BASKARAN,Arunachalam AMARKARTHIK

Journal Article

Standard-independent I/Q imbalance estimation and compensation scheme inOFDM direct-conversion transceivers

Fang-lin GU, Shan WANG, Wen-wu WANG

Journal Article

Special issue on electrochemical energy storage and conversion

Journal Article

Conversion of polyethylene to gasoline: Influence of porosity and acidity of zeolites

Journal Article

Gold modified cobalt-based Fischer-Tropsch catalysts for conversion of synthesis gas to liquid fuels

Alan J. McCue, Jura Aponaviciute, Richard P.K. Wells, James A. Anderson

Journal Article

Co anchored on porphyrinic triazine-based frameworks with excellent biocompatibility for conversion of

Journal Article

A frequency error estimation for isogeometric analysis of Kirchhoff–Love cylindrical shells

Journal Article