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A kinetic study and factor analysis of solar thermochemical membrane reactors for syngas production

Science China Technological Sciences 2025年第1期 207-221页

作者： Jiaxin XING Chao XU Xiangyu SUN Xin XIA fei jin Qiongqiong JIANG Jiale GAO Key Laboratory of Power Station Energy Transfer Conversion and System of MOE School of Energy Power and Mechanical EngineeringNorth China Electric Power University Department of Chemistry University College London School of Chemistry and Chemical Engineering Ningxia Key Laboratory of Solar Chemical Conversion TechnologyState Ethnic Affairs CommissionNorth Minzu University

Solar thermochemical conversion technologies are promising for effectively utilizing solar energy by capturing the full spectrum of solar radiation. To overcome the challenges of low energy conversion efficiency and intermittency faced by solar thermochemical conversion, these technologies can be effectively integrated with membrane reactor technology. Although the performance of solar thermochemical membrane reactors has been experimentally tested, the chemical reactions and oxygen transport mechanisms during the energy conversion process remain poorly understood. This study introduces a resistance network model to elucidate the interactions between interfacial reactions and bulk diffusion during simultaneous oxidationreduction reactions on both sides of the membrane. We analyzed the oxygen flux of the membrane reactor under various operating conditions using this model to identify the reaction/transport-limiting side of the overall process. The most effective solar membrane reactor configuration utilizes natural gas and CO2, facilitating clean conversion of fossil fuels with significant advantages in fuel production and energy efficiency. Introducing CH4lowers the overall reaction temperature, maintains low oxygen partial pressure on the sweep side, and produces a synthesis gas with a 2:1 H2/CO molar ratio. Finally, a sensitivity analysis was used to explore the relationship between overall fuel production performance and operational parameters,highlighting the critical role of this research in enhancing the reaction and transport performance of membrane reactors and advancing the development of solar-driven thermochemical fuel production technologies.

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Stochastic resonance in an under-damped bistable system driven by harmonic mixing signal

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Chinese Physics B 2018年第5期27卷 115-121页

作者： Yan-fei jin Department of Mechanics Beijing Institute of Technology Belting 100081 China

Stochastic resonance（SR） is studied in an under-damped bistable system driven by the harmonic mixing signal and Gaussian white noise. Using the linear response theory（LRT）, the expressions of the spectral amplification at fundamental and higher-order harmonic are obtained. The effects of damping coefficient, noise intensity, signal amplitude, and frequency on spectral amplifications are explored. Meanwhile, the power spectral density（PSD） and signal-to-noise ratio（SNR） are calculated to quantify SR and verify the theoretical results. The SNRs at the first and second harmonics exhibit a minimum first and a maximum later with increasing noise intensity. That is, both of the noise-induced suppression and resonance can be observed by choosing proper system parameters. Especially, when the ratio of the second harmonic amplitude to the fundamental one takes a large value, the SNR at the fundamental harmonic is a monotonic function of noise intensity and the SR phenomenon disappears.

关键词： stochastic resonance under-damped bistable system spectral amplification harmonic mixing signal

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Separability for Positive Operators on Tensor Product of Hilbert Spaces

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Acta Mathematica Sinica,English Series 2021年第6期37卷 893-910页

作者： jin Chuan HOU jin fei CHAI College of Mathematics Taiyuan University of TechnologyTaiyuan 030024P.R.China

The separability and the entanglement(that is,inseparability)of the composite quantum states play important roles in quantum information ***,a quantum state is a trace-class positive operator with trace one acting on a complex separable Hilbert *** this paper,in more general frame,the notion of separability for quantum states is generalized to bounded positive operators acting on tensor product of Hilbert ***,not like the quantum state case,there are different kinds of separability for positive operators with different operator *** types of such separability are discussed;several criteria such as the finite rank entanglement witness criterion,the positive elementary operator criterion and PPT criterion to detect the separability of the positive operators are established;some methods to construct separable positive operators by operator matrices are *** may also make us to understand the separability and entanglement of quantum states better,and may be applied to find new separable quantum states.

关键词： Hilbert spaces tensor products positive operators separability entanglement

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Virtual simulation of production line for ergonomics evaluation

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Advances in Manufacturing 2014年第1期2卷 48-53页

作者： Ming Chen jin-fei Liu Sino-German College of Applied Sciences Tongji UniversityShanghai 201804 People's Republic of China School of Electronics and Information Engineering Tongji University Shanghai 201804 People's Republic of China

To avoid ergonomic problems in the early planning stages of a production line and achieve more satisfactory planning and design, ergonomic simulation is particularly important in digital production line planning. An ergonomics analysis method is presented by using two theories： Ovako working posture analysis system （OWAS） and Burandt-Schultetus hand-arm force analysis （BSHA）. The processes of ergonomics analysis and simulation are discussed based on a platform of process simulation and process designer. As an example, the paper shows how ergonomics problems are considered in production line planning to make a better choice between different production line planning schemes.

关键词： Ergonomics Production line planning Process simulation and optimization

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Complex Wave Excitations in Generalized Broer-Kaup System

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Communications in Theoretical Physics 2007年第4X期48卷 657-661页

作者： ZHENG Chun-Long fei jin-Xi College of Mathematics and Physics Lishui University Lishui 323000 China Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China

Starting from an improved projective method and a linear variable separation approach, new families of variable separation solutions （including solltary wave solutlons, periodic wave solutions and rational function solutions） with arbitrary functions [or the （2＋ 1）-dimensional general/zed Broer-Kaup （GBK） system are derived. Usually, in terms of solitary wave solutions and/or rational function solutions, one can find abundant important localized excitations. However, based on the derived periodic wave solution in this paper, we reveal some complex wave excitations in the （2＋1）-dimensional GBK system, which describe solitons moving on a periodic wave background. Some interesting evolutional properties for these solitary waves propagating on the periodic wave bactground are also briefly discussed.

关键词： improved projective method GBK system exact solution complex wave excitation

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Random Attractors for Partly Dissipative Stochastic Lattice Dynamical Systems with Multiplicative White Noises

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Acta Mathematicae Applicatae Sinica 2015年第2期31卷 567-576页

作者： An-hui GU Sheng-fan ZHOU Qing-fei jin School of Mathematics and Statistics Southwest University Department of Mathematics Zhejiang Normal University Shanghai Mingzhu Middle School

The present paper is devoted to the existence of the random attractor for partly dissipative stochastic lattice dynamical systems with multiplicative white noises.

关键词： random attractor multiplicative white noise partly dissipative stochastic lattice dynamical systems

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About Operator Weighted Shift

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Acta Mathematica Sinica,English Series 2007年第8期23卷 1385-1390页

作者： Chun Lan JIANG Yong fei jin Zong Yao WANG Department of Mathematics Hebei Normal University Shifiazhuang 050016 P. R. China Department of Mathematics East China University of Science and Technology Shanghai 200237 P. R. China

Abstract Let H be a complex seperable Hilbert space and ^（Jt^） denote the collection of bounded linear operators on H. For an operator in L（H）, rad{A}＇ denotes the Jacobson radical of the commutant of A. This paper characterizes the similarity of strongly irreducible operator weighted shift in terms of {A}＇/rad{A}＇. Moreover, we suggest some ways to determine when an operator weighted shift is strongly irreducible and when its commutant is commutative.

关键词： Operator weighted shift Strongly irriducible operator Similarity Commutant Jacobson radical

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Facilitating efficient photocatalytic hydrogen evolution via enhanced carrier migration at MOF-on-MOF S-scheme heterojunction interfaces through a graphdiyne(C_(n)H_(2n-2))electron transport layer

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Chinese Journal of Structural Chemistry 2023年第12期42卷 11-23页

作者： fei jin Bolin Yang Xuanpu Wang Teng Li Noritatsu Tsubaki Zhiliang jin School of Chemistry and Chemical Engineering Ningxia Key Laboratory of Solar Chemical Conversion TechnologyKey Laboratory for Chemical Engineering and TechnologyState Ethnic Affairs CommissionNorth Minzu UniversityYinchuan750021PR China Department of Applied Chemistry Graduate School of EngineeringUniversity of ToyamaGofuku3190Toyama930-8555Japan

Interface engineering of photocatalysts is an effective way to enhance their photocatalytic *** this work,the MOF-on-MOF strategy was used to construct the ZIF-9(Co)/Cu_(3)BTC_(2) photocatalyst in ***,graph-diyne,possessing an inherent capability to facilitate rapid electron transfer at the interface,has been introduced into the ZIF-9(Co)/Cu_(3)BTC_(2) interface to regulate the interfacial carrier *** photogenerated carrier transfer capability has been significantly enhanced by the interfacial synergy,while retaining the original active sites and high specific surface *** exceptional efficiency performance of the composite catalyst under identical conditions could be attributed to the following two key factors:(i)The interfacial S-scheme hetero-junction in ZIF-9(Co)/Cu_(3)BTC_(2) provides the composite catalyst with strong reduction activity,facilitating the involvement of additional electrons in the reduction reaction through bended bands and an internal electric field.(ii)Carrier dynamics analysis shows that graphdiyne,as an electron transport layer,accelerates the charge migration rate at the S-scheme heterojunction interface through the electron relay *** incorporation of graphdiyne greatly improves the catalytic activity of MOFs and also demonstrates the great potential of graph-diyne in *** work provides a feasible idea for the interface engineering design of graphdiyne in photocatalysts.

关键词： Graphdiyne S-scheme heterojunction MOFs Photocatalytic hydrogen evolution

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New Families of Exact Excitations to （2＋1）-Dimensional Toda Lattice System via an Extended Projective Approach

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Communications in Theoretical Physics 2006年第5期45卷 864-868页

作者： FANG Jian-Ping fei jin-Xi ZHENG Chun-Long College of Physics and Mathematics Lishui University Lishui 323000 China Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072China

In this paper, the extended projective approach, which was recently presented and successfully used in some continuous nonlinear physical systems, is generalized to nonlinear partial differential-difference systems （DDEs）, As a concrete example, new families of exact solutions to the （2＋1）-dimensional Toda lattice system are obtained by the extended projective approach.

关键词： extended projective approach DDEs Toda lattice exact solution

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Exploratory COVID-19 death risk score based on basic laboratory tests and physiological clinical measurements

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World Journal of Emergency Medicine 2022年第6期13卷 453-458页

作者： Gui-ying Dong fei-fei jin Qi Huang Chun-bo Wu Ji-hong Zhu Tian-bing Wang Emergency Department Peking University People’s HospitalBeijing 100044China Trauma Center Peking University People’s HospitalKey Laboratory of Trauma and Neural Regeneration(PekingUniversity)Ministry of EducationBeijing100044China Department of Endocrinology and Metabolism Peking University People’s HospitalBeijing100044China

BACKGROUND:In the event of a sudden shortage of medical resources,a rapid,simple,and accurate prediction model is essential for the 30-day mortality rate of patients with ***:This retrospective study compared the characteristics of the survivals and non-survivals of 278 patients with *** regression analysis was performed to obtain the“COVID-19 death risk score”(CDRS)*** the area under the receiver operating characteristic(AUROC)curve and Hosmer-Lemeshow goodness-of-fit test,discrimination and calibration were *** validation was conducted using a regular bootstrap ***:A total of 63(22.66%)of 278 included patients *** logistic regression analysis revealed that high-sensitivity C-reactive protein(hsCRP;odds ratio[OR]=1.018),D-dimer(OR=1.101),and respiratory rate(RR;OR=1.185)were independently associated with 30-day *** was calculated as follows:CDRS=−10.245+(0.022×hsCRP)+(0.172×D-dimer)+(0.203×RR).CDRS had the same predictive effect as the sequential organ failure assessment(SOFA)and“confusion,uremia,respiratory rate,blood pressure,and age over 65 years”(CURB-65)scores,with AUROCs of 0.984 for CDRS,0.975 for SOFA,and 0.971 for CURB-65,*** CDRS showed good *** AUROC through internal validations was 0.980(95%confidence interval[CI]:0.965-0.995).Regarding the clinical value,the decision curve analysis of CDRS showed a net value similar to that of CURB-65 in this ***:CDRS is a novel,efficient and accurate prediction model for the early identification of COVID-19 patients with poor *** it is not as advanced as the other models,CDRS had a similar performance to that of SOFA and CURB-65.

关键词： COVID-19 30-day mortality Prediction model

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