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

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: investigate the impact of the temperature shock on the competition between phosphorus-accumulating organisms(PAOs) and glycogen accumulating organisms (GAOs) in start-up stage.In the competition process, organisms of tetrad forming organisms (TFOs)-like shape which were consideredWith the evidence of poly-P granules containing by Neisser-straining and result of FISH, these organismsof TFOs-like shape were better to be assumed as adaption state or a special self-protecting shape of

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

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Finite element simulations of sheet metal forming under complex strain paths

CHEN Wei, YANG Jichang, WU Xiaofeng, LU Dun, GUO Weigang

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 4,   Pages 399-403 doi: 10.1007/s11465-007-0069-8

Abstract: Fracture is a common defect in sheet metal forming and it is essentially caused by tensile instabilityThis paper analyzes some experiments and theories for building forming limit diagrams of sheet metalthis, a method that integrates the finite element simulation and experiment was used to research the formingFinally, the forming method of the rear hanger is confirmed.complex strain paths and different strain paths will have great impacts on the result of the sheet metal forming

Keywords： dangerous     forming method     different     hanger     forming    

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Digital high-efficiency print forming method and device for multi-material casting molds

Zhongde SHAN, Zhi GUO, Dong DU, Feng LIU, Wenjiang LI

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 2,   Pages 328-337 doi: 10.1007/s11465-019-0574-6

Abstract: This study proposes a novel high-efficiency print forming method and device for multi-material castingThe proposed method is specifically related to the integrated forming of two-way coating and printingThese processes can realize the high-efficiency print forming of high-performance sand molds.The integrated forming method for layered heating and roller compaction presented in this study effectively

Keywords： multi-material casting mold     3D printing     efficient print forming method    

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Formation mechanism and modeling of surface waviness in incremental sheet forming

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-022-0679-1

Abstract: Improving and controlling surface quality has always been a challenge for incremental sheet forming (

Keywords： surface waviness     incremental sheet forming     numerical simulation     formation mechanism     deformation history    

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FEM-based strain analysis study for multilayer sheet forming process

Rongjing ZHANG,Lihui LANG,Rizwan ZAFAR

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 4,   Pages 373-379 doi: 10.1007/s11465-015-0371-9

Abstract: Different forming modes such as wrinkling and fracture are discussed by using experimental and numericalHydroforming is used for multilayer forming.

Keywords： finite element method (FEM)     strain analysis     multilayer sheet forming    

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Hybrid forming mechanism of patternless casting and laser cladding

Zhongde SHAN, Fuzhen SUN, Yang LIU

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 4,   Pages 393-401 doi: 10.1007/s11465-019-0550-1

Abstract: In accordance with the requirement of manufacturing dies quickly and economically, a hybrid forming methodAn experimental study is conducted on the hybrid forming process and its trial production and application

Keywords： patternless casting     laser cladding     hybrid forming     rapid tooling    

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Highlight yield forming and innovative technologies in tropical crops

Wenquan WANG

Frontiers of Agricultural Science and Engineering 2016, Volume 3, Issue 4,   Pages 283-284 doi: 10.15302/J-FASE-2016128

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Properties and effect of forming sewage sludge into lightweight ceramics

Min YUE, Qinyan YUE, Yuanfeng QI, Baoyu GAO, Hui YU

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 1,   Pages 117-124 doi: 10.1007/s11783-010-0220-3

Abstract: In this work we investigated the chemical, thermal and toxic properties of dried sewage sludge (DSS), the preparation and properties of lightweight sludge ceramic (LSC) and the mechanisms of action of the organic and inorganic foaming agents (OFAs and IFAs). The chemical components and thermal properties of the raw materials were studied by Energy Dispersive X-ray Detection (EDX) and Thermogravimetric Analysis and Differential Scanning Calorimetry (DSC/TGA). The mineral phases of the raw materials and the formed ceramics were determined by X-ray Diffraction (XRD). The leaching characteristics of heavy metals were investigated with Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). Different ratios of DSS and clay were mixed and pressed into raw pellets. After drying and preheating treatment, the raw pellets were sintered at 1150°C for 10 min. The physical properties of LSC (50 wt% DSS added) were tested. The results showed that when the addition of DSS was above 50 wt%, LSC began to shrink, and a maximum density occurred. The environmental safety of LSC was satisfactory. XRD showed that some new mineral phases formed in the LSC. Observation of the microstructure by Scanning Electron Microscope (SEM) indicated that the body of LSC was porous.

Keywords： sludge     foaming agents     ceramics     preheating process    

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Transient performance comparison of grid-forming converters with different FRT control strategies

Frontiers in Energy 2023, Volume 17, Issue 2,   Pages 239-250 doi: 10.1007/s11708-022-0856-2

Abstract: Grid-forming converters (GFMs) are faced with the threat of transient inrush current and synchronization

Keywords： grid-forming converters (GFMs)     fault ride through (FRT)     transient stability     transient inrush current    

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Isolation and application of predatory

Ran Yu, Shiwen Zhang, Zhoukai Chen, Chuanyang Li

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 1, doi: 10.1007/s11783-017-0900-3

Abstract: -and-like organisms (BALOs) are a group of ubiquitous and obligate predatory bacteria and commonly used

Keywords： Bdellovibrio-and-like organisms (BALOs)     Biolysis     Activated sludge     Dewaterability     Predation    

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Fundamentals and Processes of Fluid Pressure Forming Technology for Complex Thin-Walled Components Review

Shijian Yuan

Engineering 2021, Volume 7, Issue 3,   Pages 358-366 doi: 10.1016/j.eng.2020.08.014

Abstract:

A new generation of fluid pressure forming technology has been developed for the three typical structureshydroforming of sheet components, die-less hydroforming of ellipsoidal shells, and dual hardening hot medium formingIn addition, future development directions of fluid pressure forming technology are discussed, includinghyper lower-loading forming for ultra-large non-uniform components, precision forming for intermetallic

Keywords： Fluid pressure forming     Hydroforming     Hot medium pressure forming     Thin-walled components     Stress state    

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Automobile Lightweight Technology: Development Trends of Aluminum/Magnesium Alloys and Their Forming

Fu Penghuai,Peng Liming and Ding Wenjiang

Strategic Study of CAE 2018, Volume 20, Issue 1,   Pages 84-90 doi: 10.15302/J-SSCAE-2018.01.012

Abstract: justify;">This study reviews the development of aluminum and magnesium alloys, including new materials, forming

Keywords： automobile     lightweight     aluminum alloy     magnesium alloy     forming technology     development trend    

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excessive anaerobic reaction time on anaerobic metabolism of denitrifying polyphosphate- accumulating organisms

Gang GUO, Yayi WANG, Chong WANG, Hong WANG, Mianli PAN, Shaowei CHEN

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 4,   Pages 616-624 doi: 10.1007/s11783-013-0505-4

Abstract: The short-term effect of anaerobic reaction time (AnRT) (i.e., 90, 120 and 150 min) on the denitrifying phosphorus (P) removal performance and N O production was examined using a denitrifying enhanced biologic phosphorus removal (EBPR) sludge acclimatized with mixed acetate (HAc) and propionate (Pro) (in the molar ratio 3∶1) as carbon sources. The results showed that when the AnRT was prolonged from 90 to 150 min, the anaerobic polyhydroxyalkanoate (PHA) synthesis was decreased by 15.3%. Moreover, the ineffective PHA consumption occurred in anaerobic phases and contributed to an increased accumulation and higher free nitrous acid (FNA) concentrations (≥0.001–0.0011 mg HNO -N/L) in the subsequent anoxic phases, causing a severe inhibition on anoxic P-uptake and denitrification. Accordingly, the total nitrogen (TN) and total phosphorus (TP) removal efficiencies dropped by approximately 6.3% and 85.5%, respectively; and the ratio of anoxic N O-N production to TN removal increased by approximately 3.8%. The fluorescence in situ hybridization (FISH) analysis revealed that the sludge was mainly dominated by (62.0% (SE = 1.5%)). In conclusion, the short-term excessive anaerobic reaction time negatively impacted denitrifying P removal performance and stimulated more N O production, and its effect on P removal was more obvious than that on nitrogen removal.

Keywords： Denitrifying phosphorus removal     anaerobic reaction time     nitrous oxide     polyhydroxyalkanoate     free nitrous acid     fluorescence in-situ hybridization    

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Fundamentals of the Unified Technology Combining Plastic Forming and Heat Treatment of Materials

Xu Zuyao (T. Y. Hsu)

Strategic Study of CAE 2004, Volume 6, Issue 1,   Pages 16-21

Abstract:

Fundamentals of the unified technology combining plastic forming and heat treatment of materials mainly

Keywords： plastic forming-heat treatment     transformation under stresses     transformation modeling     structural simulation    

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A New Technology of Plastic Forming Plate by Laser Peening

Zhou Jianzhong,Zhang Xingquan,Wang Guanglong,Yang Chaojun,Zhang Yongkang

Strategic Study of CAE 2005, Volume 7, Issue 11,   Pages 94-97

Abstract:

Laser peening forming is an emerging modern process developed from laser shock strengthening.Laser peening forming is a flexible technology, which can form tight radii in thick material with high

Keywords： laser peening forming     plate     residual stress    

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Title Author Date Type Operation

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

Nanqi REN, Han KANG, Xiuheng WANG, Nan LI

Journal Article

Finite element simulations of sheet metal forming under complex strain paths

CHEN Wei, YANG Jichang, WU Xiaofeng, LU Dun, GUO Weigang

Journal Article

Digital high-efficiency print forming method and device for multi-material casting molds

Zhongde SHAN, Zhi GUO, Dong DU, Feng LIU, Wenjiang LI

Journal Article

Formation mechanism and modeling of surface waviness in incremental sheet forming

Journal Article

FEM-based strain analysis study for multilayer sheet forming process

Rongjing ZHANG,Lihui LANG,Rizwan ZAFAR

Journal Article

Hybrid forming mechanism of patternless casting and laser cladding

Zhongde SHAN, Fuzhen SUN, Yang LIU

Journal Article

Highlight yield forming and innovative technologies in tropical crops

Wenquan WANG

Journal Article

Properties and effect of forming sewage sludge into lightweight ceramics

Min YUE, Qinyan YUE, Yuanfeng QI, Baoyu GAO, Hui YU

Journal Article

Transient performance comparison of grid-forming converters with different FRT control strategies

Journal Article

Isolation and application of predatory

Ran Yu, Shiwen Zhang, Zhoukai Chen, Chuanyang Li

Journal Article

Fundamentals and Processes of Fluid Pressure Forming Technology for Complex Thin-Walled Components

Shijian Yuan

Journal Article

Automobile Lightweight Technology: Development Trends of Aluminum/Magnesium Alloys and Their Forming

Fu Penghuai,Peng Liming and Ding Wenjiang

Journal Article

excessive anaerobic reaction time on anaerobic metabolism of denitrifying polyphosphate- accumulating organisms

Gang GUO, Yayi WANG, Chong WANG, Hong WANG, Mianli PAN, Shaowei CHEN

Journal Article

Fundamentals of the Unified Technology Combining Plastic Forming and Heat Treatment of Materials

Xu Zuyao (T. Y. Hsu)

Journal Article

A New Technology of Plastic Forming Plate by Laser Peening

Zhou Jianzhong,Zhang Xingquan,Wang Guanglong,Yang Chaojun,Zhang Yongkang

Journal Article