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Coordinated shift control of nonsynchronizer transmission for electric vehicles based on dynamic tooth

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 4,   Pages 887-900 doi: 10.1007/s11465-021-0653-3

Abstract: transmissions can enhance the dynamics and economic performance of electric vehicles (EVs), but the coordinated controlof the drive motor and gear shift mechanism during gear shifting is still a difficult challenge becauseTo improve the swiftness of gear shifting, this paper proposes a coordinated shift control method basedResults show that gear shifting duration and maximum jerk are reduced under the shift control with theproposed method, which proves the effectiveness of the proposed coordinated shift control method with

Keywords： electric vehicle     nonsynchronizer automated mechanical transmission (NSAMT)     planetary gear     coordinated shiftcontrol     dynamic tooth alignment    

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Solid-state transformer-based new traction drive system and control

Jianghua FENG, Jing SHANG, Zhixue ZHANG, Huadong LIU, Zihao HUANG

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 3,   Pages 411-426 doi: 10.1007/s11465-018-0467-0

Abstract: On this basis, an integrated control strategy built upon synchronous rotating reference frame is presentedto achieve unified control over fundamental active, reactive and harmonic components.The carrier-interleaving phase shift modulation strategy is proposed to improve the harmonic performanceSimulation and experimental results have verified that the traction system and control scheme mentioned

Keywords： transformer     high-voltage cascaded rectifier     LLC resonant converter     synchronous rotating reference frame     carrier-interleavingphase shift control     secondary pulsating voltage     beat frequency    

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The impact of different voltage application modes on biodegradation of chloramphenicol and shift of microbial

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 11, doi: 10.1007/s11783-022-1576-x

Abstract:

● Presented coupled system enhanced biodegradation of antibiotic chloramphenicol.

Keywords： Electrical stimulation     Biodegradation     Microbial community     Chloramphenicol    

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Visible-light-driven heterostructured g-CN/Bi-TiO floating photocatalyst with enhanced charge carrier

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 6, doi: 10.1007/s11783-021-1417-3

Abstract:

• Bi doping in TiO2 enhanced the separation of photo-generated electron-hole.

Keywords： Bi doping     Visible light     Algal removal     Charge carrier separation    

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Enhanced activity of bimetallic Fe-Cu catalysts supported on ceria toward water gas shift reaction: synergistic

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 12,   Pages 1962-1972 doi: 10.1007/s11705-023-2359-z

Abstract: Within the “hydrogen chain”, the high-temperature water gas shift reaction represents a key step to improveDespite the commercial application of the high-temperature water gas shift, novel catalysts characterized

Keywords： water gas shift     iron     copper     bimetallic catalysts     ceria     hydrogen    

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Charge-carrier photogeneration and extraction dynamics of polymer solar cells probed by a transient photocurrent

Boa Jin, Hyunmin Park, Yang Liu, Leijing Liu, Jongdeok An, Wenjing Tian, Chan Im

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 1,   Pages 164-179 doi: 10.1007/s11705-020-1976-z

Abstract: photogenerated charge carriers within polymer-based bulk-heterojunction-type solar cells, the charge-carriercarriers, the external quantum efficiencies as well as the extraction quantum efficiencies of the charge-carrierSubsequently, the charge-carrier concentration-dependent mobility values were obtained, and they arediscussed in consideration of the additional influences of the charge-carrier losses from the deviceduring the charge-carrier extraction that also affects the photocurrent-trace shape.

Keywords： charge-carrier photogeneration     transient photocurrent     polymer solar cells     charge-carrier extraction     space    

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Multi-objective genetic algorithms based structural optimization and experimental investigation of the planet carrier

Pengxing YI,Lijian DONG,Tielin SHI

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 4,   Pages 354-367 doi: 10.1007/s11465-014-0319-5

Abstract:

To improve the dynamic performance and reduce the weight of the planet carrier in wind turbine gearboxFirstly, the design points’ distribution for the design variables of the planet carrier is establishedAs well, this method is applied to design and optimize the planet carrier in a 1.5 MW wind turbine gearboxCompared with the original design, the mass and the stress of the optimized planet carrier are respectivelyConsequently, the cost of planet carrier is greatly reduced and its stability is also improved.

Keywords： planet carrier     multi-objective optimization     genetic algorithms     wind turbine gearbox     modal experiment    

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Effects of carrier-attached biofilm on oxygen transfer efficiency in a moving bed biofilm reactor

Yanling WEI,Xunfei YIN,Lu QI,Hongchen WANG,Yiwei GONG,Yaqian LUO

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 3,   Pages 569-577 doi: 10.1007/s11783-015-0822-x

Abstract: Three laboratory-scale moving bed biofilm reactors (MBBR) with different carrier filling ratios rangingfrom 40% to 60% were used to study the effects of carrier-attached biofilm on oxygen transfer efficiencyThese results were compared to αSOTE of wastewater with a clean carrier (no biofilm attached).conditions, αSOTE decreased by approximately 70% as compared to αSOTE of wastewater at a different carrier-fillingThis indicated that the biofilm attached to the carrier had a negative effect on αSOTE.

Keywords： carrier     biofilm     oxygen transfer efficiency     moving bed biofilm reactor    

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Effects of BTA2 as the third component on the charge carrier generation and recombination behavior of

Leijing Liu, Hao Zhang, Bo Xiao, Yang Liu, Bin Xu, Chen Wang, Shanpeng Wen, Erjun Zhou, Gang Chen, Chan Im, Wenjing Tian

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 1,   Pages 127-137 doi: 10.1007/s11705-020-1936-7

Abstract: Effects of a benzotriazole (BTA)-based small molecule, BTA2, as the third component on the charge carrieraggravates the phase separation between the donor and the acceptor, which is disadvantageous to charge carrier

Keywords： third component     organic solar cells     charge carrier generation     charge carrier recombination     bimolecular    

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Energy shift: decline of easy oil and restructuring of geo-politics

Oliver R. INDERWILDI,David A. KING

Frontiers in Energy 2016, Volume 10, Issue 3,   Pages 260-267 doi: 10.1007/s11708-016-0416-8

Abstract: This paper critically assesses the geopolitical and geo-economic impact of novel fuel resources on both resource exporters and importers. Presently, very strong political and economic forces drive the utilisation of domestic, unconventional oil and gas recovery in the West as these enhance energy security and ease balance of payment issues. The additional capacity generated by this trend has, supported by other effects such as Saudi Arabia’s decision to maintain current production, triggered a significant reduction of oil prices. Consequently, it is now oil exporters that struggle with the balance of payment issues and often these countries base their fiscal budget completely on fossil fuel revenues. In fact, these unconventional resources help turn the tide while oil exporters are now politically significantly weakened due to the increased energy sufficiency of the West. The catch is that the extraction of unconventional types of oil has many environmental implications. So, internalising the environmental externalities have to be considered. This paper, therefore, assesses, next to geopolitics and geo-economics, the environmental implications of this trend.

Keywords： energy security     climatic change     geo-economics     geopolitics     unconventional resources     macroeconomics    

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Nitrogen removal efficiencies and microbial communities in full-scale IFAS and MBBR municipal wastewater treatment plants at high COD:N ratio

Supaporn Phanwilai, Naluporn Kangwannarakul, Pongsak (Lek) Noophan, Tamao Kasahara, Akihiko Terada, Junko Munakata-Marr, Linda Ann Figueroa

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 6, doi: 10.1007/s11783-020-1374-2

Abstract: Abstract • Two IFAS and two MBBR full-scale systems (high COD:N ratio 8:1) were characterized. • High specific surface area carriers grew and retained slow-growing nitrifiers. • High TN removal is related to high SRT and low DO concentration in anoxic tanks. The relative locations of AOB, NOB, and DNB were examined for three different kinds of carriers in two types of hybrid biofilm process configurations: integrated fixed-film activated sludge (IFAS) and moving bed biofilm reactor (MBBR) processes. IFAS water resource recovery facilities (WRRFs) used AnodkalnessTM K1 carriers (KC) at Broomfield, Colorado, USA and polypropylene resin carriers (RC) at Fukuoka, Japan, while MBBR WRRFs used KC carriers at South Adams County, Colorado, USA and sponge carriers (SC) at Saga, Japan. Influent COD to N ratios ranged from 8:1 to 15:1. The COD and BOD removal efficiencies were high (96%–98%); NH4+-N and TN removal efficiencies were more varied at 72%–98% and 64%–77%, respectively. The extent of TN removal was higher at high SRT, high COD:N ratio and low DO concentration in the anoxic tank. In IFAS, RC with high specific surface area (SSA) maintained higher AOB population than KC. Sponge carriers with high SSA maintained higher overall bacteria population than KC in MBBR systems. However, the DNB were not more abundant in high SSA carriers. The diversity of AOB, NOB, and DNB was fairly similar in different carriers. Nitrosomonas sp. dominated over Nitrosospira sp. while denitrifying bacteria included Rhodobacter sp., Sulfuritalea sp., Rubrivivax sp., Paracoccus sp., and Pseudomonas sp. The results from this work suggest that high SRT, high COD:N ratio, low DO concentration in anoxic tanks, and carriers with greater surface area may be recommended for high COD, BOD and TN removal in WRRFs with IFAS and MBBR systems.

Keywords： IFAS     MBBR     AnodkalnessTM K1 carrier     Polypropylene resin carrier     Sponge carrier    

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Construction engineering management culture shift: Is the lowest tender offer dead?

Eric SCHEEPBOUWER, Douglas D. GRANSBERG, Carla Lopez del PUERTO

Frontiers of Engineering Management 2017, Volume 4, Issue 1,   Pages 49-57 doi: 10.15302/J-FEM-2017014

Abstract: This means that all project control tools for managing cost, schedule, and technical scope must be transformed

Keywords： cost certainty     lowest responsible bid     best value     public procurement     construction engineering management culture    

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Seasonal microbial community shift in a saline sewage treatment plant

Qingmei YAN, Xuxiang ZHANG, Tong ZHANG, Herbert H P FANG

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 1,   Pages 40-47 doi: 10.1007/s11783-011-0304-8

Abstract: treatment plant of Hong Kong (China) during June 2007 to May 2008 to analyze the microbial community shiftEnvironmental changes resulted into a seasonal microbial community shift characterized by alterationswith sludge retention time, influent total phosphorus had an inverse effect on the community structure shiftof this study may contribute to the development of new knowledge involving the microbial community shift

Keywords： sewage treatment plants     polymerase chain reaction (PCR)     denaturing gradient gel electrophoresis (DGGE)     canonical correspondence analysis     correspondence analysis    

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Reduction kinetics of SrFeO/CaO∙MnO nanocomposite as effective oxygen carrier for chemical looping partial

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 12,   Pages 1726-1734 doi: 10.1007/s11705-022-2188-5

Abstract: Chemical looping reforming of methane is a novel and effective approach to convert methane to syngas, in which oxygen transfer is achieved by a redox material. Although lots of efforts have been made to develop high-performance redox materials, a few studies have focused on the redox kinetics. In this work, the kinetics of SrFeO3−δ–CaO∙MnO nanocomposite reduction by methane was investigated both on a thermo-gravimetric analyzer and in a packed-bed microreactor. During the methane reduction, combustion occurs before the partial oxidation and there exists a transition between them. The weight loss due to combustion increases, but the transition region becomes less inconspicuous as the reduction temperature increased. The weight loss associated with the partial oxidation is much larger than that with combustion. The rate of weight loss related to the partial oxidation is well fitted by the Avrami–Erofeyev equation with n = 3 (A3 model) with an activation energy of 59.8 kJ∙mol‒1. The rate law for the partial oxidation includes a solid conversion term whose expression is given by the A3 model and a methane pressure-dependent term represented by a power law. The partial oxidation is half order with respect to methane pressure. The proposed rate law could well predict the reduction kinetics; thus, it may be used to design and/or analyze a chemical looping reforming reactor.

Keywords： chemical looping reforming     SrFeO3−δ/CaO·MnO nanocomposite     reduction kinetics     Avrami–Erofeyev model     pressure-dependent term    

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A Discussion and Study on the Center Shift Phenomena of a Building Fire-whirl

Chen Changkun,Yao Bin,Fan Weicheng

Strategic Study of CAE 2003, Volume 5, Issue 10,   Pages 63-68

Abstract: behavior of building fire-whirl is studied, and an analytical method to describe and express the center shiftmethod, the large eddy simulation (LES) technology is employed for numerical simulation of the center shift

Keywords： fire-whirl     center shift     large eddy simulation     building    

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Title Author Date Type Operation

Coordinated shift control of nonsynchronizer transmission for electric vehicles based on dynamic tooth

Journal Article

Solid-state transformer-based new traction drive system and control

Jianghua FENG, Jing SHANG, Zhixue ZHANG, Huadong LIU, Zihao HUANG

Journal Article

The impact of different voltage application modes on biodegradation of chloramphenicol and shift of microbial

Journal Article

Visible-light-driven heterostructured g-CN/Bi-TiO floating photocatalyst with enhanced charge carrier

Journal Article

Enhanced activity of bimetallic Fe-Cu catalysts supported on ceria toward water gas shift reaction: synergistic

Journal Article

Charge-carrier photogeneration and extraction dynamics of polymer solar cells probed by a transient photocurrent

Boa Jin, Hyunmin Park, Yang Liu, Leijing Liu, Jongdeok An, Wenjing Tian, Chan Im

Journal Article

Multi-objective genetic algorithms based structural optimization and experimental investigation of the planet carrier

Pengxing YI,Lijian DONG,Tielin SHI

Journal Article

Effects of carrier-attached biofilm on oxygen transfer efficiency in a moving bed biofilm reactor

Yanling WEI,Xunfei YIN,Lu QI,Hongchen WANG,Yiwei GONG,Yaqian LUO

Journal Article

Effects of BTA2 as the third component on the charge carrier generation and recombination behavior of

Leijing Liu, Hao Zhang, Bo Xiao, Yang Liu, Bin Xu, Chen Wang, Shanpeng Wen, Erjun Zhou, Gang Chen, Chan Im, Wenjing Tian

Journal Article

Energy shift: decline of easy oil and restructuring of geo-politics

Oliver R. INDERWILDI,David A. KING

Journal Article

Nitrogen removal efficiencies and microbial communities in full-scale IFAS and MBBR municipal wastewater treatment plants at high COD:N ratio

Supaporn Phanwilai, Naluporn Kangwannarakul, Pongsak (Lek) Noophan, Tamao Kasahara, Akihiko Terada, Junko Munakata-Marr, Linda Ann Figueroa

Journal Article

Construction engineering management culture shift: Is the lowest tender offer dead?

Eric SCHEEPBOUWER, Douglas D. GRANSBERG, Carla Lopez del PUERTO

Journal Article

Seasonal microbial community shift in a saline sewage treatment plant

Qingmei YAN, Xuxiang ZHANG, Tong ZHANG, Herbert H P FANG

Journal Article

Reduction kinetics of SrFeO/CaO∙MnO nanocomposite as effective oxygen carrier for chemical looping partial

Journal Article

A Discussion and Study on the Center Shift Phenomena of a Building Fire-whirl

Chen Changkun,Yao Bin,Fan Weicheng

Journal Article