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Research progress on low dielectric constant modification of cellulose insulating paper for power transformers

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 8,   Pages 991-1009 doi: 10.1007/s11705-022-2259-7

Abstract: insulation level of ultrahigh voltage transformers and reduce their weight and size, reducing the dielectric constantThe dielectric constant of a cellulose insulating paper can be effectively reduced by chemical or physicalforeign and domestic research status of the use of modification technology to reduce the dielectric constantThis paper can provide a reference for further research on low dielectric constant cellulose insulating

Keywords： low dielectric constant     chemical and physical modification     cellulose insulating paper     transformer    

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Design and evaluation of control strategies in urban drainage systems in Kunming city

Xin Dong, Senchen Huang, Siyu Zeng

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 4, doi: 10.1007/s11783-017-0968-9

Abstract: Real time control (RTC) of urban drainage systems (UDSs) is an important measure to reduce combined sewerprinciples, a detailed design procedure is shown for the case UDS resulting in three RTC strategies: static, constant

Keywords： Urban drainage system     Real time control     Static strategy     Constant strategy     Equal filling strategy    

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Laws of 4D Printing Article

Farhang Momeni, Jun Ni

Engineering 2020, Volume 6, Issue 9,   Pages 1035-1055 doi: 10.1016/j.eng.2020.01.015

Abstract: machining) and further enables the fourth dimension of products to provide intelligent behavior over time4D-printed structures is the presence of one additional dimension, which provides for smart evolution over timeWe show that two types of time constants are needed to capture the correct time-dependent behavior ofinterface of active and passive materials in 4D multi-material structures, leading to one of the two timeWe develop and extract the other time constant from our unified model of time-dependent behavior of nearly

Keywords： Manufacturing     Stimuli-responsive materials     Mechanics of materials     Time constant     4D printing    

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Analysis and characterization of wind-solar-constant torque spring hybridized model

Shantanu ACHARYA,Subhadeep BHATTACHARJEE

Frontiers in Energy 2014, Volume 8, Issue 3,   Pages 279-289 doi: 10.1007/s11708-014-0312-z

Abstract: Solar and wind are the most promising renewable energy resources. But their unpredictable and varying nature prevents them from being used as the sole resource for power generation. This paper presents a model of wind and solar thermal hybrid power plant with a spring storage system which is expected to play an efficient role in combating with the drawbacks related to renewable power generation. In the proposed scheme, wind energy is harnessed by a hybrid vertical axis wind turbine, solar energy is utilized by a Stirling engine, and the surplus energy is stored in a winding spring. The paper discusses the working methodologies and analyses the performance of such 2.6 kW hybrid power plant model. It has been observed that the plant is capable of consistently generating 50% of its rated capacity irrespective of limitations in solar and wind resources.

Keywords： hybrid vertical axis wind turbine     Stirling engine     solar-thermal energy     wind energy     constant torque spring    

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Development of a fan-stirred constant volume combustion chamber and turbulence measurement with PIV

Frontiers in Energy 2022, Volume 16, Issue 6,   Pages 973-987 doi: 10.1007/s11708-021-0762-z

Abstract: A fan-stirred combustion chamber is deve-loped for spherically expanding flames, with P and T up to 10 bar and 473 K, respectively. Turbulence characteristics are estimated using particle image velocimetry (PIV) at different initial pressures (P = 0.5–5 bar), fan frequencies (ω = 0–2000 r/min), and impeller diameters (D = 100 and 114 mm). The flame propagation of methanol/air is investigated at different turbulence intensities (u′=0–1.77 m/s) and equivalence ratios (φ = 0.7–1.5). The results show that u′ is independent of P and proportional to ω, which can be up to 3.5 m/s at 2000 r/min. LT is independent of P and performs a power regression with ω approximately. The turbulent field is homogeneous and isotropic in the central region of the chamber while the inertial subrange of spatial energy spectrum is more collapsed to –5/3 law at a high ReT. Compared to laminar expanding flames, the morpho-logy of turbulent expanding flames is wrinkled and the wrinkles will be finer with the growth of turbulence intensity, consistent with the decline of the Taylor scale and the Kolmogorov scale. The determined SL in the present study is in good agreement with that of previous literature. The SL and ST of methanol/air have a non-monotonic trend with φ while peak ST is shifted to the richer side compared to SL. This indicates that the newly built turbulent combustion chamber is reliable for further experimental study.

Keywords： fan-stirred combustion chamber     turbulence characteristics     particle image velocimetry (PIV)     methanol     turbulent expanding flames    

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Solar photovoltaic fed dual input LED lighting system with constant illumination control

Kinattingal SUNDARESWARAN,Kevin Ark KUMAR,Payyalore Raman VENKATESWARAN,Sankaran PALANI

Frontiers in Energy 2016, Volume 10, Issue 4,   Pages 473-478 doi: 10.1007/s11708-016-0420-z

Abstract: A dual input LED lighting scheme with constant illumination is proposed in this paper.microcontroller is programmed to operate a changeover switch as well as a DC-DC converter for uninterrupted and constant

Keywords： photovoltaic     LED light     dual input     P&O algorithm    

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Blind Multi-user Detection Based on Simplified LSCMA in STBC Coded MC－CDMA Systems

Xiong Yilan,Li Guangzeng

Strategic Study of CAE 2007, Volume 9, Issue 5,   Pages 42-45

Abstract:

Utilizing the orthogonal feature of space time block coding ( STBC) , a simple and feasible algorithm based on constant modulus (CM) criterion is proposed for blindalgorithm proposed in the paper as a simplified version of the algorithm based on the least square constant

Keywords： space time block code     MC-CDMA     constant modulus algorithm     blind multi_user detection    

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The energy consumption in a batch stripper and a batch rectifier

Xianbao CUI, Tianyang FENG, Ying ZHANG, Zhicai YANG,

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 4,   Pages 443-452 doi: 10.1007/s11705-009-0266-6

Abstract: energy consumption of a batch stripper was compared to that of a batch rectifier under “general constantreflux” and “general constant distillate composition” with the ratio of minimum energyenergy consumption of a batch stripper is less than that of a batch rectifier under “general constantreflux” and “general constant distillate composition”.relative volatility is low, a batch stripper can also consume less energy only in the “general constant

Keywords： constant reflux     feed     energy consumption     general constant     product purity    

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Calculation of Bond-length, Bond-energy and Force Constant of Hydrogen Molecule by Classical Mechanics

Chen Jing

Strategic Study of CAE 2003, Volume 5, Issue 6,   Pages 39-43

Abstract: density distribution and electron cloud belong in fact, to statistic regularity, and imply a macro-timescale is used, therefore in hydrogen molecule the product of energy and time is far larger than PlanckConstant.mechanics, and the hydrogen molecule bond-length Re, bonding-energy De and force constant

Keywords： hydrogen molecule     bond-length     bond-energy     force constant    

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A Novel Variable Speed Constant Frequency Doubly Fed Salient Pole Synchronous Machine

Ning Yuquan

Strategic Study of CAE 2004, Volume 6, Issue 12,   Pages 27-31

Abstract:

This paper presents a novel variable speed constant frequency doubly fed salient pole synchronousand construction of variable speed salient pole synchronous machines, especially on variable speed constantIt makes machine to achieve good character of variable speed constant frequency.

Keywords： salient pole synchronous machines     doubly fed variable speed constant frequency     AC excited    

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Constant temperature control of tundish induction heating power supply for metallurgical manufacturing

Yufei YUE, Qianming XU, Peng GUO, An LUO

Frontiers in Energy 2019, Volume 13, Issue 1,   Pages 16-26 doi: 10.1007/s11708-018-0572-0

Abstract: Specially, the constant temperature control is greatly significant for metallurgical manufacturing.In terms of the relationship between TIH load temperature and output power of TIHPS, the constant temperatureharmonic current blocking strategy and a load voltage feedforward control are also proposed to realize constant

Keywords： tundish induction heating power supply (TIHPS)     constant temperature control     input harmonic current blocking    

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Seismic response of precast reinforced concrete wall subjected to cyclic in-plane and constant out-of-plane

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 5,   Pages 1128-1143 doi: 10.1007/s11709-021-0753-5

Abstract: This paper provides insight into the seismic behavior of a full-scale precast reinforced concrete wall under in-plane cyclic loading combined with out-of-plane loading replicated by sand backfill to simulate the actual condition of basement walls. The tested wall exhibited flexural cracks, owing to the high aspect ratio and considerable out-of-plane movement due to lateral pressure from the backfill. The wall performed satisfactorily by exhibiting competent seismic parameters and deformation characteristics governed by its ductile response in the nonlinear phase during the test with smaller residual drift. Numerical analysis was conducted to validate experimental findings, which complied with each other. The numerical model was used to conduct parametric studies to study the effect of backfill density and aspect ratio on seismic response of the proposed precast wall system. The in-plane capacity of walls reduced, while deformation characteristics were unaffected by the increase in backfill density. An increase in aspect ratio leads to a reduction in in-plane capacity and an increase in drift. Curves between the ratio of in-plane yield capacity and design shear load of walls are proposed for the backfill density, which may be adopted to determine the in-plane yield capacity of the basement walls based on their design shear.

Keywords： precast wall     basement wall     out-of-plane response     quasi-static test     sand backfill     seismic parameters    

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Convective heat transfer in helical coils for constant-property and variable-property flows with high

Yufei MAO, Liejin GUO, Bofeng BAI, Ximin ZHANG

Frontiers in Energy 2010, Volume 4, Issue 4,   Pages 546-552 doi: 10.1007/s11708-010-0116-8

Abstract: Both constant-property flows at normal pressure and variable-property flows at supercritical pressure

Keywords： convective heat transfer     helical coils     high Reynolds number     supercritical pressure     variable property    

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Deep eutectic solvent inclusions for high- composite dielectric elastomers

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 6,   Pages 996-1002 doi: 10.1007/s11705-022-2138-2

Abstract: High-performance dielectric elastomers with good mechanical stretchability and high dielectric constantHerein, we have successfully developed a novel strategy for improving the dielectric constant of polymericThe as-prepared composite elastomers showed good stretchability and a greatly enhanced dielectric constant

Keywords： composite materials     deep eutectic solvent     dielectric elastomer     high dielectric constant    

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Removing ammonia from air with a constant pH, slightly acidic water　spray wet scrubber using recycled

Ahmad Kalbasi Ashtari, Amir M. Samani Majd, Gerald L. Riskowski, Saqib Mukhtar, Lingying Zhao

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 6, doi: 10.1007/s11783-016-0869-3

Abstract: First, the solution pH was varied from 2 to 8 while maintaining constant air velocity at 1.3 m·s .Next, air velocity was increased (2 and 3 m·s ) while solution pH remained constant at pH6.The NH removed from the air was held in solution as NH and accumulates over time so the solution should

Keywords： Ammonia     Spray wet scrubber     Slightly acidic scrubbing solution     Controlled pH     Removal efficiency    

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Title Author Date Type Operation

Research progress on low dielectric constant modification of cellulose insulating paper for power transformers

Journal Article

Design and evaluation of control strategies in urban drainage systems in Kunming city

Xin Dong, Senchen Huang, Siyu Zeng

Journal Article

Laws of 4D Printing

Farhang Momeni, Jun Ni

Journal Article

Analysis and characterization of wind-solar-constant torque spring hybridized model

Shantanu ACHARYA,Subhadeep BHATTACHARJEE

Journal Article

Development of a fan-stirred constant volume combustion chamber and turbulence measurement with PIV

Journal Article

Solar photovoltaic fed dual input LED lighting system with constant illumination control

Kinattingal SUNDARESWARAN,Kevin Ark KUMAR,Payyalore Raman VENKATESWARAN,Sankaran PALANI

Journal Article

Blind Multi-user Detection Based on Simplified LSCMA in STBC Coded MC－CDMA Systems

Xiong Yilan,Li Guangzeng

Journal Article

The energy consumption in a batch stripper and a batch rectifier

Xianbao CUI, Tianyang FENG, Ying ZHANG, Zhicai YANG,

Journal Article

Calculation of Bond-length, Bond-energy and Force Constant of Hydrogen Molecule by Classical Mechanics

Chen Jing

Journal Article

A Novel Variable Speed Constant Frequency Doubly Fed Salient Pole Synchronous Machine

Ning Yuquan

Journal Article

Constant temperature control of tundish induction heating power supply for metallurgical manufacturing

Yufei YUE, Qianming XU, Peng GUO, An LUO

Journal Article

Seismic response of precast reinforced concrete wall subjected to cyclic in-plane and constant out-of-plane

Journal Article

Convective heat transfer in helical coils for constant-property and variable-property flows with high

Yufei MAO, Liejin GUO, Bofeng BAI, Ximin ZHANG

Journal Article

Deep eutectic solvent inclusions for high- composite dielectric elastomers

Journal Article

Removing ammonia from air with a constant pH, slightly acidic water　spray wet scrubber using recycled

Ahmad Kalbasi Ashtari, Amir M. Samani Majd, Gerald L. Riskowski, Saqib Mukhtar, Lingying Zhao

Journal Article