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Bi-modes alternation stepping ultrasonic motors

JIN Jiamei, ZHAO Chunsheng

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 1,   Pages 101-105 doi: 10.1007/s11465-008-0018-1

Abstract: Two-phase sinusoidal signals corresponding to the two modal frequencies drive the motor bi-direction

Keywords： miss-step     bi-direction     Two-phase sinusoidal     positioning     accumulative    

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Qualitative analysis of direction of public hospital reforms in China

Dahai Zhao, Zhiruo Zhang

Frontiers of Medicine 2018, Volume 12, Issue 2,   Pages 218-223 doi: 10.1007/s11684-017-0534-7

Abstract: Thus, a feasible direction of reforms in Chinese public hospitals is suggested and reliable policy suggestionsThe most crucial step in setting the direction of reforms in public hospitals in China is transforming

Keywords： public hospital     government hospital     public funding     operation mechanism    

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Topology optimization of piezoelectric bi-material actuators with velocity feedback control

Mariana MORETTI, Emílio C. N. SILVA

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 2,   Pages 190-200 doi: 10.1007/s11465-019-0537-y

Abstract: The bi-material and multifunctional concepts are considered for the design of a controlled piezoelectricThe bi-material piezoelectric actuator (BPEA) has its metallic host layer designed by the TOM, which

Keywords： topology optimization method     bi-material piezoactuator     active velocity feedback control     time-domain transient    

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Biologically inspired model of path integration based on head direction cells and grid cells

Yang ZHOU,De-wei WU

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 5,   Pages 435-448 doi: 10.1631/FITEE.1500364

Abstract: The firing of head direction cells (HDCs) and grid cells (GCs) is related to the moving direction and

Keywords： Head direction cells (HDCs)     Grid cells (GCs)     Path integration     Bionic navigation    

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Acoustic characteristics of bi-directional turbines for thermoacoustic generators

Dongdong LIU, Yanyan CHEN, Wei DAI, Ercang LUO

Frontiers in Energy 2022, Volume 16, Issue 6,   Pages 1027-1036 doi: 10.1007/s11708-020-0702-3

Abstract: Bi-directional turbines combined with rotary motors may be a feasible option for developing high powerA general expression for the acoustic characteristics of the bi-directional turbine was proposed basedThe good fit of the correlations shows that these characteristics are valid for describing the bi-directional

Keywords： thermoacoustic power generator     acoustic characteristics     bi-directional impulse turbine     energy conversion    

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Cu-doped Bi/Bi2WO6 catalysts for efficient N2 fixation by photocatalysis

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 10,   Pages 1412-1422 doi: 10.1007/s11705-023-2312-1

Abstract: In this paper, Cu-doped Bi2WO6 was synthesized via a solvothermal method and appliedthat the synthesized photocatalyst is actually Bi/Cu-Bi2WO6 composite.of Bi2WO6.The optimized NH3 generation rates of Bi/Cu-Bi2WO6 reached 624 and 243/Bi2WO6, respectively.

Keywords： Bi2WO6     Cu doping     work function     photocatalytic N2 fixation     charge    

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Modeling the impact of uncertainty in emissions trading markets with bankable permits

Yongliang ZHANG, Bing ZHANG, Jun BI, Pan HE

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 2,   Pages 231-241 doi: 10.1007/s11783-012-0431-x

Abstract: The various forms of uncertainty that firms may face in bankable emission permit trading markets will affect firms’ decision making as well as their market performance. This research explores the effect of increased uncertainty over future input costs and output prices on the temporal distribution of emission. In a dynamic programming setting, the permit price is a convex function of stochastic prices of coal and electricity. Increased uncertainty about future market conditions increases the expected permit price and causes a risk neutral firm to reduce ex ante emissions in order to smooth out marginal abatement costs over time. Finally, safety valves, both low-side and high-side, are suggested to reduce the impact of uncertainty in bankable emission trading markets.

Keywords： uncertainty     bankable     emission trading     market performance    

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Hybrid genetic algorithm for bi-objective resource-constrained project scheduling

Fikri KUCUKSAYACIGIL, Gündüz ULUSOY

Frontiers of Engineering Management 2020, Volume 7, Issue 3,   Pages 426-446 doi: 10.1007/s42524-020-0100-x

Abstract: In this study, we considered a bi-objective, multi-project, multi-mode resource-constrained project scheduling

Keywords： backward–forward scheduling     hybrid bi-objective genetic algorithm     injection procedure     maximum cash balance    

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Digital manufacturing—the development direction of the manufacturing technology in the 21st century

XIONG You-lun, YIN Zhou-ping

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 2,   Pages 125-130 doi: 10.1007/s11465-006-0021-3

Abstract: After introducing the concepts of digital manufacturing technology, the discipline framework of digital manufacturing is presented in the paper by discussing its basic concept, theory foundation, key technology and scientific problems in detail. As the core of the advanced manufacturing technology, digital manufacturing is gradually becoming the main manufacturing technology of the twenty-first century. Firstly, the main features of digital manufacturing are indicated and its key supporting technologies are investigated by grouping them into four levels related to product development, numerical control, production management, and enterprise collaboration, respectively. Moreover, the existing problems in the research on the multi-discipline theory foundation of digital manufacturing such as manufacturing informatics, computational manufacturing, and manufacturing intelligence, are also indicated. Then, the core scientific problems of digital manufacturing are discussed in depth, which focuses on digitization of manufacturing information, modeling of manufacturing constraints, high-speed and high-precision numerical control theory, and Internet-based collaboration and integration. Lastly, the development trends and application perspectives of digital manufacturing are concluded.

Keywords： development     foundation     multi-discipline     scientific     supporting    

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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

Keywords： Bi doping     Visible light     Algal removal     Charge carrier separation    

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Conversion of phenol to cyclohexane in the aqueous phase over Ni/zeolite bi-functional catalysts

Jimei Zhang, Fuping Tian, Junwen Chen, Yanchun Shi, Hongbin Cao, Pengge Ning, Shanshan Sun, Yongbing Xie

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 2,   Pages 288-298 doi: 10.1007/s11705-020-1932-y

Abstract: A series of Ni/HZSM-5 and Ni/HIM-5 bi-functional catalysts were synthesized and applied to the aqueous-phaseImportantly, the Ni/HIM-5 bi-functional catalyst exhibited a high activity (98.3%) and high selectivity

Keywords： aqueous-phase hydrodeoxygenation     phenol     hydrocarbons     Ni/HIM-5     bi-functional catalyst    

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Drivers and barriers to engage enterprises in environmental management initiatives in Suzhou Industrial Park, China

Bing ZHANG, Jun BI, Beibei LIU

Frontiers of Environmental Science & Engineering 2009, Volume 3, Issue 2,   Pages 210-220 doi: 10.1007/s11783-009-0014-7

Abstract: Small- and medium-sized enterprises (SMEs) play an important role in sustainable development not only for their significant contribution to China’s economy, but also for their big share of total discharged pollutants. Therefore, this research takes the enterprises in Suzhou Industrial Park, China as the case study to investigate the environmental management practices of SMEs, and identify drivers and barriers to engaging businesses in environmental management initiatives. It is shown that, as in other countries, SMEs are less active in adopting environmental management initiatives than larger companies. Legislation remains the key driver to engage SMEs in environmental management initiatives. Based on the analysis, policy recommendations are also presented.

Keywords： small- and medium-sized enterprises (SMEs)     environmental management initiative     Suzhou industrial park    

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Direction and influencing factors of hydraulic fracture

Zhao Guoshi,Xu Jian,Qiu Jinping

Strategic Study of CAE 2012, Volume 14, Issue 4,   Pages 100-104

Abstract: Most of the hydraulic fracture extend along the greatest principal stress direction, which also affectedIt is proved that the rule of the greatest principal stress direction except some anomaly directions.

Keywords： direction of hydraulic fracture     geological structure     original faults     faulting plane    

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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: The SRAO phenomena tended to occur only under certain conditions. High amount of biomass and non-anaerobic condition is requirement for SRAO. Anammox bacteria cannot oxidize ammonium with sulfate as electron acceptor. AOB and AnAOB are mainly responsible for ammonium conversion. Heterotrophic sulfate reduction mainly contributed to sulfate conversion. For over two decades, sulfate reduction with ammonium oxidation (SRAO) had been reported from laboratory experiments. SRAO was considered an autotrophic process mediated by anammox bacteria, in which ammonium as electron donor was oxidized by the electron acceptor sulfate. This process had been attributed to observed transformations of nitrogenous and sulfurous compounds in natural environments. Results obtained differed largely for the conversion mole ratios (ammonium/sulfate), and even the intermediate and final products of sulfate reduction. Thus, the hypothesis of biological conversion pathways of ammonium and sulfate in anammox consortia is implausible. In this study, continuous reactor experiments (with working volume of 3.8L) and batch tests were conducted under normal anaerobic (0.2≤DO<0.5 mg/L) / strict anaerobic (DO<0.2 mg/L) conditions with different biomass proportions to verify the SRAO phenomena and identify possible pathways behind substrate conversion. Key findings were that SRAO occurred only in cases of high amounts of inoculant biomass under normal anaerobic condition, while absent under strict anaerobic conditions for same anammox consortia. Mass balance and stoichiometry were checked based on experimental results and the thermodynamics proposed by previous studies were critically discussed. Thus anammox bacteria do not possess the ability to oxidize ammonium with sulfate as electron acceptor and the assumed SRAO could, in fact, be a combination of aerobic ammonium oxidation, anammox and heterotrophic sulfate reduction processes.

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

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Review on cryogenic technologies for CO removal from natural gas

Yujing BI, Yonglin JU

Frontiers in Energy 2022, Volume 16, Issue 5,   Pages 793-811 doi: 10.1007/s11708-022-0821-0

Abstract: CO2 in natural gas (NG) is prone to condense directly from gas to solid or solidify from liquid to solid at low temperatures due to its high triple point and boiling temperature, which can cause a block of equipment. Meanwhile, CO2 will also affect the calorific value of NG. Based on the above reasons, CO2 must be removed during the NG liquefaction process. Compared with conventional methods, cryogenic technologies for CO2 removal from NG have attracted wide attention due to their non-polluting and low-cost advantages. Its integration with NG liquefaction can make rational use of the cold energy and realize the purification of NG and the production of by-product liquid CO2. In this paper, the phase behavior of the CH4-CO2 binary mixture is summarized, which provides a basis for the process design of cryogenic CO2 removal from NG. Then, the detailed techniques of design and optimization for cryogenic CO2 removal in recent years are summarized, including the gas-liquid phase change technique and the gas-solid phase change technique. Finally, several improvements for further development of the cryogenic CO2 removal process are proposed. The removal process in combination with the phase change and the traditional techniques with renewable energy will be the broad prospect for future development.

Keywords： cryogenic CO2 removal     purification of natural gas (NG)     biogas upgrading     CH4-CO2 binary system    

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Title Author Date Type Operation

Bi-modes alternation stepping ultrasonic motors

JIN Jiamei, ZHAO Chunsheng

Journal Article

Qualitative analysis of direction of public hospital reforms in China

Dahai Zhao, Zhiruo Zhang

Journal Article

Topology optimization of piezoelectric bi-material actuators with velocity feedback control

Mariana MORETTI, Emílio C. N. SILVA

Journal Article

Biologically inspired model of path integration based on head direction cells and grid cells

Yang ZHOU,De-wei WU

Journal Article

Acoustic characteristics of bi-directional turbines for thermoacoustic generators

Dongdong LIU, Yanyan CHEN, Wei DAI, Ercang LUO

Journal Article

Cu-doped Bi/Bi2WO6 catalysts for efficient N2 fixation by photocatalysis

Journal Article

Modeling the impact of uncertainty in emissions trading markets with bankable permits

Yongliang ZHANG, Bing ZHANG, Jun BI, Pan HE

Journal Article

Hybrid genetic algorithm for bi-objective resource-constrained project scheduling

Fikri KUCUKSAYACIGIL, Gündüz ULUSOY

Journal Article

Digital manufacturing—the development direction of the manufacturing technology in the 21st century

XIONG You-lun, YIN Zhou-ping

Journal Article

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

Journal Article

Conversion of phenol to cyclohexane in the aqueous phase over Ni/zeolite bi-functional catalysts

Jimei Zhang, Fuping Tian, Junwen Chen, Yanchun Shi, Hongbin Cao, Pengge Ning, Shanshan Sun, Yongbing Xie

Journal Article

Drivers and barriers to engage enterprises in environmental management initiatives in Suzhou Industrial Park, China

Bing ZHANG, Jun BI, Beibei LIU

Journal Article

Direction and influencing factors of hydraulic fracture

Zhao Guoshi,Xu Jian,Qiu Jinping

Journal Article

Biological conversion pathways of sulfate reduction ammonium oxidation in anammox consortia

Zhen Bi, Deqing Wanyan, Xiang Li, Yong Huang

Journal Article

Review on cryogenic technologies for CO removal from natural gas

Yujing BI, Yonglin JU

Journal Article