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< Page ,Total 32758 >
Explosion characteristics of bio-syngas at various fuel compositions and dilutions in a confined vessel EI SCIE Scopus
期刊论文 | 2020 , 259 , 116254 | FUEL
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Abstract :

Safety issues for production, transportation, storage, and usage of bio-syngas persist due to the variability of bio-syngas composition. Therefore, this study focuses on the effects of fuel composition variation (H-2/CO/CH4) and diluents (N-2/CO2) on the explosion characteristics of bio-syngas/air mixtures in a constant volume combustion vessel. The experimentally determined explosion parameters were obtained at an initial temperature of 303 K, equivalence ratios of 0.6-1.5 and atmospheric pressure with a wide range of H-2/CO/CH4 compositions and dilution ratios. The results show that the concentration of H-2 or CH4 in the fuel mixture has a great influence on the explosion characteristics of bio-syngas/air mixtures, while the concentration of CO in the fuel mixture plays a mild role in affecting the explosion behaviors. Moreover, it is observed that the addition of N-2/CO2 to the fuel mixture can significantly reduce the potential of explosion hazards of bio-syngas/air mixtures, and CO2 dilution has stronger suppression effect on the explosion characteristics due to its larger negative influence on the thermal effect and chemical effect in comparison to that of N-2 dilution. The corresponding correlations of P-max/P-0 = f(Z(dilution)), t(c) = f(Z(dilution)), and (dP/dt)max = f(Z(dilution)) were found for predicting the explosion behaviors of N-2/CO2 diluted bio-syngas/air mixture at various dilution ratios.

Keyword :

Bio-syngas Explosion characteristics Fuel composition Dilution effect

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GB/T 7714 Zhou, Q , Cheung, CS , Leung, CW et al. Explosion characteristics of bio-syngas at various fuel compositions and dilutions in a confined vessel [J]. | FUEL , 2020 , 259 : 116254 .
MLA Zhou, Q et al. "Explosion characteristics of bio-syngas at various fuel compositions and dilutions in a confined vessel" . | FUEL 259 (2020) : 116254 .
APA Zhou, Q , Cheung, CS , Leung, CW , Li, XT , Huang, ZH . Explosion characteristics of bio-syngas at various fuel compositions and dilutions in a confined vessel . | FUEL , 2020 , 259 , 116254 .
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Effects of H-2 addition on the formation and emissions of CO/NO2/NOx in the laminar premixed biogas-hydrogen flame undergoing the flame-wall interaction EI SCIE Scopus
期刊论文 | 2020 , 259 , 116257 | FUEL
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Abstract :

The overall emissions of CO, NOx and NO2/NOx ratio of laminar premixed biogas-hydrogen flames undergoing the flame-wall interaction (FWI) were measured experimentally while the emission indexes (EI) were calculated. The computational model was employed to calculate the combustion process of the biogas-hydrogen flame, and four major routes to produce the NO were isolated and calculated in the simulations. The effects of H-2 addition on the formations and emissions of CO/NO2/NOx of BG75-hydrogen impinging flames were analyzed quantitatively. The results show that, with the H-2 addition, the EICO of BG75-hydrogen flame is enhanced steadily at either small separated distance (H) or large H thanks to that the high reactivity of H-2 suppresses the CO oxidization efficiently by competing for the OH radical. The H-2 addition can improve the NO production via four routes and increase the EINOx of the BG75-hydrogen flame. Although the prompt NO is improved by the H-2 addition, its rising trend is decreased considerably as hydrogen addition is larger than 20% owing to the reduced methane proportion and improved premixed combustion. The contribution of prompt NO is decreased with the H-2 addition, while that of other routes are increased steadily. The NNH route dominates the increased EINOx at small H while the thermal route dominates the rising trend at large H. EINO2 is enhanced steadily with the H-2 addition due to the improved HO2 production in the air mixing region, while the NO2 conversion ratio is improved and suppressed with H-2 addition at small and large H, respectively.

Keyword :

H-2 effects CO and NOx Emission formation Overall emission Biogas-hydrogen blends Flame impingement

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GB/T 7714 Wei, ZL , Zhen, HS , Leung, CW et al. Effects of H-2 addition on the formation and emissions of CO/NO2/NOx in the laminar premixed biogas-hydrogen flame undergoing the flame-wall interaction [J]. | FUEL , 2020 , 259 : 116257 .
MLA Wei, ZL et al. "Effects of H-2 addition on the formation and emissions of CO/NO2/NOx in the laminar premixed biogas-hydrogen flame undergoing the flame-wall interaction" . | FUEL 259 (2020) : 116257 .
APA Wei, ZL , Zhen, HS , Leung, CW , Cheung, CS , Huang, ZH . Effects of H-2 addition on the formation and emissions of CO/NO2/NOx in the laminar premixed biogas-hydrogen flame undergoing the flame-wall interaction . | FUEL , 2020 , 259 , 116257 .
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Whether to Delay the Release of eBooks or Not? An Analysis of Optimal Publishing Strategies for Book Publishers SSCI
期刊论文 | 2019 , 14 (2) , 124-137 | JOURNAL OF THEORETICAL AND APPLIED ELECTRONIC COMMERCE RESEARCH
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Abstract :

The eBooks market has been growing rapidly in recent years. At the same time, evidence shows that eBooks are cannibalizing the market for physical books. To alleviate the cannibalization effect between eBooks and physical books, publishers may choose to delay the release of eBooks or physical books for a period of time. Adopting a stylized two-period model, this paper investigates three publishing strategies for a monopolistic publisher: delaying the release of eBooks, delaying the release of physical books, and releasing them simultaneously. We find that the publisher should delay the format that has significantly less market potential. Furthermore, the one that has greater market potential should be priced higher. In addition, a stronger substitution effect between eBooks and physical books favors delaying strategies. Finally, the smaller marginal cost for eBooks than physical books renders the strategy to delay the release of physical books more popular.

Keyword :

Substitution effect eBook Pricing strategies Publishing strategies Cannibalization

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GB/T 7714 Li, Fan , Li, Shengli , Gu, Jiarong . Whether to Delay the Release of eBooks or Not? An Analysis of Optimal Publishing Strategies for Book Publishers [J]. | JOURNAL OF THEORETICAL AND APPLIED ELECTRONIC COMMERCE RESEARCH , 2019 , 14 (2) : 124-137 .
MLA Li, Fan et al. "Whether to Delay the Release of eBooks or Not? An Analysis of Optimal Publishing Strategies for Book Publishers" . | JOURNAL OF THEORETICAL AND APPLIED ELECTRONIC COMMERCE RESEARCH 14 . 2 (2019) : 124-137 .
APA Li, Fan , Li, Shengli , Gu, Jiarong . Whether to Delay the Release of eBooks or Not? An Analysis of Optimal Publishing Strategies for Book Publishers . | JOURNAL OF THEORETICAL AND APPLIED ELECTRONIC COMMERCE RESEARCH , 2019 , 14 (2) , 124-137 .
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Vibration localization for a rotating mistuning bladed disk with the Coriolis effect by a state-space decoupling method EI Scopus SCIE
期刊论文 | 2019 , 233 (3) , 1011-1020 | Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering
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Abstract :

Slight deviations of blades due to manufacturing tolerances can cause mistuning of bladed disk leading to localized vibration, which can accelerate fatigue. Moreover, the rotating blades are subjected to the Coriolis effect and the influence of the Coriolis force on the natural frequencies of high-speed rotational bladed disks such as those of an aero-engine become more apparent. In this paper, the effect of Coriolis force on the forced response localization of a mistuned bladed disk are investigated, for conditions where the natural frequency located in the first and second modal families of the bladed disk. Mistuning is introduced by varying the Young’s modulus of each blade. Due to the asymmetric Coriolis matrix, it is not possible to directly decouple the system. A state-space decoupling method is developed to decouple the system to effectively calculate the forced response of bladed disk with the consideration of the Coriolis effect. The results show that response localization factor is increased by 13.09% considering the Coriolis force compared to the system without considering the Coriolis effect, in the case of where the first modal family is considered. In addition, the response localization factor with the consideration of the Coriolis force is decreased by 30.85% compared to the system without considering the Coriolis force, when the second modal family is considered. It indicates that the forced response localization with the consideration of the Coriolis effect will be changed obviously with the rotational speed increasing, when the concerning natural frequency is located in the first and second modal families. Furthermore, the effect of Coriolis force causes changes in the resonant frequencies and resonant amplitude, but does not introduce additional resonant peaks for the case of the mistuned bladed disk. © 2017, © IMechE 2017.

Keyword :

Coriolis effect Forced response Localization factor localization vibration Manufacturing tolerances Mistuned bladed disks Resonant amplitude Vibration localization

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GB/T 7714 Kan, Xuanen , Xu, Zili . Vibration localization for a rotating mistuning bladed disk with the Coriolis effect by a state-space decoupling method [J]. | Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering , 2019 , 233 (3) : 1011-1020 .
MLA Kan, Xuanen et al. "Vibration localization for a rotating mistuning bladed disk with the Coriolis effect by a state-space decoupling method" . | Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233 . 3 (2019) : 1011-1020 .
APA Kan, Xuanen , Xu, Zili . Vibration localization for a rotating mistuning bladed disk with the Coriolis effect by a state-space decoupling method . | Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering , 2019 , 233 (3) , 1011-1020 .
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General parameterized proximal point algorithm with applications in statistical learning EI Scopus SCIE
期刊论文 | 2019 , 96 (1) , 199-215 | International Journal of Computer Mathematics
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Abstract :

In the literature, there are a few researches to design some parameters in the proximal point algorithm (PPA), especially for the multi-objective convex optimizations. Introducing some parameters to PPA can make it more flexible and attractive. Mainly motivated by our recent work [Bai et al. A parameterized proximal point algorithm for separable convex optimization. Optim Lett. (2017) doi:10.1007/s11590-017-1195-9], in this paper we develop a general parameterized PPA with a relaxation step for solving the multi-block separable structured convex programming. By making use of the variational inequality and some mathematical identities, the global convergence and the worst-case (Formula presented.) convergence rate of the proposed algorithm are established. Preliminary numerical experiments on solving a sparse matrix minimization problem from statistical learning validate that our algorithm is more efficient than several state-of-the-art algorithms. © 2018 Informa UK Limited, trading as Taylor & Francis Group

Keyword :

complexity Minimization problems Numerical experiments Proximal point algorithm relaxation step State-of-the-art algorithms Statistical learning Variational inequalities

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GB/T 7714 Bai, Jianchao , Li, Jicheng , Dai, Pingfan et al. General parameterized proximal point algorithm with applications in statistical learning [J]. | International Journal of Computer Mathematics , 2019 , 96 (1) : 199-215 .
MLA Bai, Jianchao et al. "General parameterized proximal point algorithm with applications in statistical learning" . | International Journal of Computer Mathematics 96 . 1 (2019) : 199-215 .
APA Bai, Jianchao , Li, Jicheng , Dai, Pingfan , Li, Jiaofen . General parameterized proximal point algorithm with applications in statistical learning . | International Journal of Computer Mathematics , 2019 , 96 (1) , 199-215 .
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Investigation of characteristics of discharge pressure pulsation in a twin-screw refrigeration compressor EI Scopus SCIE
期刊论文 | 2019 , 233 (6) , 2206-2224 | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
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Abstract :

In this paper, characteristics of discharge pressure pulsation in a twin-screw refrigeration compressor are investigated. A thermodynamic model is developed and validated using data from a comprehensive experimental study. This validated model is then applied to investigate effects of key parameters including condensing temperature, compressor rotational speed, super-feed pressure, part-load operation, and design parameters on the discharge pressure pulsation. The results showed that the discharge pressure pulsation was mainly due to periodic variations of mass and energy flow from the working volumes to the discharge chamber. As the condensing temperature increased or decreased from the design condition, the compressor was in either over- or undercompression leading to an increase in the amplitude of the pressure pulsation. The gas super-feed pressure could increase the pressure pulsation at condensing temperatures below the design value and reduce the pressure pulsation at condensing temperatures above the design value. The analysis also demonstrated that the pressure pulsation was lower at part-load conditions. However, the compressor rotational speed increased both the amplitude and frequency of the pressure pulsation. Theoretical analysis of design parameters indicated that a large discharge volume with a high number of lobes could lower the pressure pulsation. These analyses provide useful information for the compressor design and optimization. © 2018, IMechE 2018.

Keyword :

Condensing temperature Discharge pressures Part load conditions Part load operation Pressure pulsation Refrigeration compressors Thermodynamic model Twin screw

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GB/T 7714 Chen, Wenqing , Wu, Xiaokun , Xing, Ziwen et al. Investigation of characteristics of discharge pressure pulsation in a twin-screw refrigeration compressor [J]. | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science , 2019 , 233 (6) : 2206-2224 .
MLA Chen, Wenqing et al. "Investigation of characteristics of discharge pressure pulsation in a twin-screw refrigeration compressor" . | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233 . 6 (2019) : 2206-2224 .
APA Chen, Wenqing , Wu, Xiaokun , Xing, Ziwen , Wang, Xiaolin . Investigation of characteristics of discharge pressure pulsation in a twin-screw refrigeration compressor . | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science , 2019 , 233 (6) , 2206-2224 .
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A Novel Buck-Boost Converter with Low Electric Stress on Components EI Scopus SCIE
期刊论文 | 2019 , 66 (4) , 2703-2713 | IEEE Transactions on Industrial Electronics
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Abstract :

A novel buck-boost converter with low electric stress on components and negative output voltage is proposed. The operational principle, steady-state analysis, and small-signal modeling of the proposed buck-boost converter in continuous conduction mode are presented. Comparisons among another five buck-boost converters and the proposed buck-boost converter are presented. It is found that the proposed converter's voltage gain is smaller than the other converters' in step-down mode. Also, based upon the comparisons among the same kind and same number of components, the voltage and current stresses on the power switch of the proposed buck-boost converter are less than or equal to those of the comparative converters, and the voltage stress on the charge pump capacitor and the switching device power rating of the proposed buck-boost converter are always lower than those of other comparative converters. The efficiency of the proposed buck-boost converter is highest among those converters having the same number of elements. These advantages make component selection for the proposed converter much easier, and it can be used directly in applications needing a negative voltage source. Finally, simulation results and circuit experiments are given for validating the effectiveness of the proposed buck-boost converter. IEEE

Keyword :

Buck boost converter Continuous conduction mode Electric stress Number of components Operational principles Steady state Steady-state analysis Switching device power

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GB/T 7714 Li, Jing , Liu, Jinjun . A Novel Buck-Boost Converter with Low Electric Stress on Components [J]. | IEEE Transactions on Industrial Electronics , 2019 , 66 (4) : 2703-2713 .
MLA Li, Jing et al. "A Novel Buck-Boost Converter with Low Electric Stress on Components" . | IEEE Transactions on Industrial Electronics 66 . 4 (2019) : 2703-2713 .
APA Li, Jing , Liu, Jinjun . A Novel Buck-Boost Converter with Low Electric Stress on Components . | IEEE Transactions on Industrial Electronics , 2019 , 66 (4) , 2703-2713 .
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Effect of geometry error on accuracy of large-diameter pads used for CMP dressing EI Scopus SCIE
期刊论文 | 2019 , 100 (5-8) , 1505-1520 | International Journal of Advanced Manufacturing Technology
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Abstract :

Large-diameter polishing pads play an important role in chemical mechanical polishing (CMP) and are vital to large-aperture plane optics. The surface profile of a wafer is closely related to the profile accuracy of the polyurethane pad. To attain a high-precision surface, the polishing pad is dressed using a diamond dresser. In the present study, a pad dressing model was proposed as a means of analysing how any geometry errors in the polishing machine affect the profile accuracy by observing the trajectory of the moving dresser tool. Based on the spherical surface generation method, the influence of any tilt and motion error on the profile accuracy of the pad was studied. To verify the accuracy of the model, a variety of analyses and dressing experiments were performed using PPS100 and KPJ1700 CMP machines. The results of these experiments showed that the proposed model could effectively predict the profile accuracy of the pad after the dressing process. However, because of uncertainty in the measurements, there was a degree of error between the predicted and measured values, although this was never > 5%. Moreover, the results demonstrated that the main geometry error was the dressing spindle’s tilt angle which, if minimised, resulted in a higher dressing profile accuracy for the polyurethane pad. © 2018, Springer-Verlag London Ltd., part of Springer Nature.

Keyword :

Chemical mechanical polishing(CMP) Geometry errors Measured values Polishing pads Polyurethane pads Profile accuracies Spherical surface Surface profiles

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GB/T 7714 Ban, X.X. , Zhao, H.Y. , Zhao, S.J. et al. Effect of geometry error on accuracy of large-diameter pads used for CMP dressing [J]. | International Journal of Advanced Manufacturing Technology , 2019 , 100 (5-8) : 1505-1520 .
MLA Ban, X.X. et al. "Effect of geometry error on accuracy of large-diameter pads used for CMP dressing" . | International Journal of Advanced Manufacturing Technology 100 . 5-8 (2019) : 1505-1520 .
APA Ban, X.X. , Zhao, H.Y. , Zhao, S.J. , Xie, R.Q. , Gu, Y.W. , Zhu, X.L. et al. Effect of geometry error on accuracy of large-diameter pads used for CMP dressing . | International Journal of Advanced Manufacturing Technology , 2019 , 100 (5-8) , 1505-1520 .
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Bracelet: arms-down selection for Kinect mid-air gesture EI Scopus SSCI SCIE
期刊论文 | 2019 , 38 (4) , 401-409 | Behaviour and Information Technology
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Abstract :

Gesture-based interaction has become more affordable and ubiquitous as an interaction style in recent years. Since gesture-based interactions lead to fatigue and cause heaviness in upper limbs, a problem commonly known as ‘Gorilla-Arm Syndrome’ occurs. Then Bracelet is proposed, an arms-down selection method based on Kinect. Its purpose is reducing fatigue in a long mid-air gesture interaction session. An evaluation of 16 participants compared with previous methods such as mid-air gestures and other arms-down interactions showed the effectiveness of the Bracelet in reducing fatigue. As the Bracelet is helpful to alleviate fatigue in some situations where selection is intensive and has no time limit, it can be used as a ‘plug-in’ for other methods and applied for display in many public places such as airports, stations, shopping malls and waiting rooms. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.

Keyword :

arms-down gorilla-arm Mid-air gestures point-and-dwell push

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GB/T 7714 Li, Xiaoling , Han, Feng , Sun, Xiuwen et al. Bracelet: arms-down selection for Kinect mid-air gesture [J]. | Behaviour and Information Technology , 2019 , 38 (4) : 401-409 .
MLA Li, Xiaoling et al. "Bracelet: arms-down selection for Kinect mid-air gesture" . | Behaviour and Information Technology 38 . 4 (2019) : 401-409 .
APA Li, Xiaoling , Han, Feng , Sun, Xiuwen , Liu, Yang , Li, Yin , Chen, Yao . Bracelet: arms-down selection for Kinect mid-air gesture . | Behaviour and Information Technology , 2019 , 38 (4) , 401-409 .
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Comparison study on the different dynamics between the Allen?Cahn and the Cahn?Hilliard equations EI Scopus SCIE
期刊论文 | 2019 , 77 (2) , 311-322 | Computers and Mathematics with Applications
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Abstract :

We perform a comparison study on the different dynamics between the Allen–Cahn (AC) and the Cahn–Hilliard (CH) equations. The AC equation describes the evolution of a non-conserved order field during anti-phase domain coarsening. The CH equation describes the process of phase separation of a conserved order field. The AC and the CH equations are second-order and fourth-order nonlinear parabolic partial differential equations, respectively. Linear stability analysis shows that growing and decaying modes for both the equations are the same. While the growth rates are monotonically decreasing with respect to the modes for the AC equation, the growth rates for the CH equation are increasing and then decreasing with respect to the modes. We perform various numerical tests using the Fourier spectral method to highlight the different evolutionary dynamics between the AC and the CH equations. © 2018 Elsevier Ltd

Keyword :

Antiphase domains Comparison study Decaying modes Evolutionary dynamics Fastest growing mode Nonlinear parabolic partial differential equations Numerical tests Spectral methods

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GB/T 7714 Li, Yibao , Jeong, Darae , Kim, Hyundong et al. Comparison study on the different dynamics between the Allen?Cahn and the Cahn?Hilliard equations [J]. | Computers and Mathematics with Applications , 2019 , 77 (2) : 311-322 .
MLA Li, Yibao et al. "Comparison study on the different dynamics between the Allen?Cahn and the Cahn?Hilliard equations" . | Computers and Mathematics with Applications 77 . 2 (2019) : 311-322 .
APA Li, Yibao , Jeong, Darae , Kim, Hyundong , Lee, Chaeyoung , Kim, Junseok . Comparison study on the different dynamics between the Allen?Cahn and the Cahn?Hilliard equations . | Computers and Mathematics with Applications , 2019 , 77 (2) , 311-322 .
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