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Functional layer engineering to improve performance of protonic ceramic fuel cells

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Rare Metals 2023年第7期42卷 2250-2260页

作者： Ning Wang zhi-yin huang Chun-Mei Tang Li-Xin Xing Ling Meng Yoshitaka Aoki Lei Du Si-Yu Ye huangpu Hydrogen Energy Innovation Center School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou510006China Graduate School of Chemical Sciences and Engineering Hokkaido UniversitySapporo060-8628Japan Faculty of Engineering Hokkaido UniversitySapporo060-8628Japan

Protonic ceramic fuel cells(PCFCs)have been attracting increasing attention because of their advances in high-efficiency power generation in an intermediate-temperature range,as compared to the high-temperature solid oxide fuel cells(SOFCs).The greatest difference between PCFCs and SOFCs is the specific requirement of protonic(H+)conductivity at the PCFC cathode,in addition to the electronic(e^(-))and oxide-ion(O^(2-))*** development of a triple H^(+)/e^(-)/O^(2-)conductor for PCFC cathode is still ***,the most-widely used cathode material is based on the mature e^(-)/O^(2-)***,this leads to insufficient triple phase boundary(TPB),i.e.,reaction ***,an efficient strategy that uses a~100 nm-thick proton conductive functional layer(La_(0.5)Sr_(0.5)CoO_(3-δ),LSC55)in-between the typical La_(0.8)Sr_(0.2)CoO_(3-δ)cathode(a mature e-/O^(2-)conductor,LS C 82)and B aZr_(0.4)Ce_(0.4)Y_(0.1)Yb_(0.)1O_(3-δ)elec trolyte(11 mm in diameter,20μm in thickness)is proposed to significantly enhance the reaction ***,the ohmic resistance and polarization resistance are both decreased by 47%and 62%,respectively,compared with that of PCFCs without the functional *** power density of the PCFC with such a functional layer can be raised by up to 2.24 times,superior to those described in previous *** enhanced PCFC performances are attributed to the well-built TPB and enhanced reaction area via the functional layer engineering strategy.

关键词： Protonic ceramic fuel cell(PCFC) Cathode functional layer(CFL) Power density Triple phase boundary(TPB)

Incidence,prevalence,and comorbidities of chronic pancreatitis:A 7-year population-based study

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World Journal of Gastroenterology 2023年第30期29卷 4671-4684页

作者： Qiu-Yu Cai Kun Tan Xue-Li Zhang Xu Han Jing-Ping Pan zhi-yin huang Cheng-Wei Tang Jing Li Department of Gastroenterology West China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina Sichuan Health Information Association Chengdu 610041Sichuan ProvinceChina

BACKGROUND Chronic pancreatitis(CP)is a fibroinflammatory syndrome leading to reduced quality of life and shortened life ***-based estimates of the incidence,prevalence,and comorbidities of CP in China are *** To characterize the incidence,prevalence,and comorbidities of CP in Sichuan Province,China,with population-based *** Data on CP from 2015 to 2021 were obtained from the Health Information Center of Sichuan *** the study period,a total of 38090 individuals were diagnosed with CP in Sichuan *** yearly incidence rate and point prevalence rate(December 31,2021)of CP were *** prevalence of comorbid conditions in CP patients was *** annual number of CPrelated hospitalizations,hospital length of stay,and hospitalization costs for CP were *** incidence rates were standardized for age by the direct method using the permanent population of Sichuan Province in the 2020 census as the standard *** analysis of variance test for the linearity of scaled variables and the Cochran-Armitage trend test for categorical data were performed to investigate the yearly trends,and a two-sided test with P<0.05 was considered statistically *** The 38090 CP patients comprised 23280 males and 14810 *** mean age of patients at CP diagnosis was 57.83 years,with male patients(55.87 years)being younger than female patients(60.11 years)(P<0.001).The mean incidence rate of CP during the study period was 6.81 per 100000 person-years,and the incidence of CP increased each year,from 4.03 per 100000 person-years in 2015 to 8.27 per 100000 person-years in 2021(P<0.001).The point prevalence rate of CP in 2021 was 45.52 per 100000 individuals for the total population,with rates of 55.04 per 100000 individuals for men and 35.78 per 100000 individuals for women(P<0.001).Individuals aged 65 years or older had the highest prevalence of CP(113.38 per 100000 individuals)(P<0.001).Diabetes

关键词： Chronic pancreatitis Epidemiology Incidence Prevalence Comorbidities Disease burden

Effect of Inter-Stage Pressure on Performances of Two-Stage Transcritical CO2 Refrigeration Cycle with Dedicated Absorption Dual-Subcooling and Mechanical Recooling

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Journal of Thermal Science 2024年第6期33卷 2179-2189页

作者： LI Zeyu huang Caoxuheng yin Jianhui School of Electric Power South China University of Technology Guangdong Province Key Laboratory of High Efficient and Clean Energy Utilization South China University of Technology Guangdong Province Engineering Research Center of High Efficient and Low Pollution Energy Conversion Ningbo Jetron Technology Co.Ltd.

The two-stage transcritical CO2refrigeration cycle with dedicated dual-subcooling and mechanical recooling is *** inter-stage pressure is critical for such cycle performances;however,it has not been studied ***,the research aim is to disclose the effect of inter-stage pressure on performances of the proposed *** main work consists of four ***,the comparative study is performed to display advantages of the proposed ***,the key temperatures,heat and power consumptions as well as performance indicators for different inter-stage pressures are analyzed in detail,based on the parametric ***,the optimal inter-stage pressure for different conditions is obtained by the nonlinear direct search ***,the economic performance is *** is found that the compressor power of the proposed cycle drops by 12%,and the working temperature lower limit is reduced by 11℃.Furthermore,it is considered that the optimal inter-stage pressure is insensitive to the heat source *** novelty lies in illustrating the effect of inter-stage pressure,obtaining trends of the optimal value,and pointing out the system *** paper is favorable for design and operation optimization of the proposed system.

关键词： CO2 refrigeration dedicated absorption subcooling recooling thermodynamics two-stage cycle

Analytic optimal pose tracking control in close-range proximity operations with a non-cooperative target

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Chinese Journal of Aeronautics 2024年第5期37卷 410-425页

作者： Caisheng WEI Guanhua huang Zeyang yin Qifeng CHEN School of Automation Central South UniversityChangsha 410083China

This paper investigates an analytical optimal pose tracking control problem for chaser spacecraft during the close-range proximity operations with a non-cooperative space target subject to attitude tumbling and unknown orbital ***,the relative translational motion between the orbital target and the chaser spacecraft is described in the Line-of-Sight(LOS)coordinate frame along with attitude quaternion ***,based on the coupled 6-Degree of Freedom(DOF)pose dynamic model,an analytical optimal control action consisting of constrained optimal control value,application time and its duration are proposed via exploring the iterative sequential action control ***,the global closed-loop asymptotic stability of the proposed predictive control action is presented and *** with traditional proximity control schemes,the highlighting advantages are that the application time and duration of the devised controller is applied discretely in light of the influence of the instantaneous pose configuration on the pose tracking performance with less energy consumptions rather than at each sample ***,three groups of illustrative examples are organized to validate the effectiveness of the proposed analytical optimal pose tracking control scheme.

关键词： Optimal control Close-range proximity operation Non-cooperative space target Coupled attitude and orbit control Iterative sequential action control

A multiscale differential-algebraic neural network-based method for learning dynamical systems

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International Journal of Mechanical System Dynamics 2024年第1期4卷 77-87页

作者： yin huang Jieyu Ding College of Computer Science&Technology Qingdao UniversityQingdaoChina School of Mathematics and Statistics Qingdao UniversityQingdaoChina Center for Computational Mechanics and Engineering Simulation Qingdao UniversityQingdaoChina

The objective of dynamical system learning tasks is to forecast the future behavior of a system by leveraging observed ***,such systems can sometimes exhibit rigidity due to significant variations in component parameters or the presence of slow and fast variables,leading to challenges in *** overcome this limitation,we propose a multiscale differential-algebraic neural network(MDANN)method that utilizes Lagrangian mechanics and incorporates multiscale information for dynamical system *** MDANN method consists of two main components:the Lagrangian mechanics module and the multiscale *** Lagrangian mechanics module embeds the system in Cartesian coordinates,adopts a differential-algebraic equation format,and uses Lagrange multipliers to impose constraints explicitly,simplifying the learning *** multiscale module converts high-frequency components into low-frequency components using radial scaling to learn subprocesses with large differences in *** results demonstrate that the proposed MDANN method effectively improves the learning of dynamical systems under rigid conditions.

关键词： dynamical systems learning multibody system dynamics differential-algebraic equation neural networks multiscale structures

Synergistic Tuning of Nickel Cobalt Selenide@Nickel Telluride Core-Shell Heteroarchitectures for Boosting Overall Urea Electrooxidation and Electrochemical Supercapattery

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Energy & Environmental Materials 2024年第1期7卷 301-312页

作者： Diab Khalafallah Weibo huang Mingjia zhi Zhanglian Hong State Key Laboratory of Silicon Material School of Materials Science and EngineeringZhejiang University38 Zheda RoadHangzhou 310027China Mechanical Design and Materials Department Faculty of Energy EngineeringAswan UniversityP.O.Box 81521AswanEgypt

Herein,we demonstrate the synthesis of bifunctional nickel cobalt selenide@nickel telluride(Ni_(x)Co_(12-x)Se@NiTe)core-shell heterostructures via an electrodeposition approach for overall urea electrolysis and *** 3D vertically orientated NiTe dendritic frameworks induce the homogeneous nucleation of 2D Ni_(x)Co_(12-x)Se nanosheet arrays along similar crystal directions and bring a strong interfacial binding between the integrated active *** particular,the optimized Ni_(6)Co_(6)Se@NiTe with an interface coupling effect works in concert to tune the intrinsic *** only needs a low overpotential of 1.33 V to yield a current density of 10 mA cm^(-2)for alkaline urea ***,the full urea catalysis driven only by Ni_(6)Co_(6)Se@NiTe achieves 10 mA cm^(-2)at a potential of 1.38 V and can approach a constant level of the current response for 40 ***,the integrated Ni_(6)Co_(6)Se@NiTe electrode delivers an enhanced specific capacity(223 mA h g^(-1)at 1 A g^(-1))with a high cycling ***,a hybrid asymmetric supercapacitor(HASC)device based on Ni_(6)Co_(6)Se@NiTe exhibits a favorable rate capability and reaches a high energy density of 67.7 Wh kg^(-1)and a power density of 724.8 W kg^(-1)with an exceptional capacity retention of 92.4%after sequential 12000 cycles at 5 A g^(-1).

关键词： bifunctional Ni_(x)Co_(12-x)Se@NiTe core-shell electrodeposition heterointerfaces supercapacitors UOR

Electro-coalescence of heterogeneous paired-droplets under AC electric field

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Droplet 2024年第4期3卷 39-47页

作者： zhi Tao Weidong Fang Haiwang Li Shuai yin Tiantong Xu Teckneng Wong Yi huang National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics Research Institute of Aero-EngineBeihang UniversityBeijingChina School of Mechanical and Power Engineering Nanjing Tech UniversityNanjingChina School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingaporeSingapore

Controllable droplet coalescence exhibits unique advantages and intriguing prospect in chemical synthesis and biological *** researches focusing on the droplets of the same physics are,however,limited in terms of the interaction between different *** this work,the electro-coalescence of heterogeneous paireddroplets is investigated in a microfluidic chip controlled by an AC electric *** characteristics of merging dynamics are analyzed under different electric conditions and fluid properties,and an on-chip cross-linking reaction is conducted to enable the instantaneous production of hydrogel *** find that the coalescence of heterogeneous paired-droplets expands the range of start positions and prolongs the merging time compared to homogeneous *** evolution process of interfaces is accelerated with the increasing voltage,which contributes to the mixing of diverse *** electrical conductivities lead to distinct internal mechanisms within *** voltage across the droplet is reduced with the increasing conductivity,while the enhanced attraction between free charges plays a complimentary role in interface *** the surface tension reduced the required electric conditions for *** with the non-Newtonian property,the droplet presents a non-linear relationship in the coalescence region,triggering coalescence with filaments at low voltages and showcasing superior performance at high *** on above findings,we successfully produce alginate hydrogel microspheres with a wide range of concentrations in high monodispersity,achieving a clean fabrication of pure hydrogel without any additives and no need for subsequent *** results reveal the electro-hydrodynamics of heterogeneous paireddroplets,promoting the development of droplet coalescence in chemical and material science.

关键词： coalescence linking property

The occurrence characteristics of oil in shales matrix from organic geochemical screening data and pore structure properties:An experimental study Author links open overlay panel

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Petroleum Science 2024年第1期21卷 1-13页

作者： Zi-zhi Lin Jun-Qian Li Shuang-Fang Lu Qin-Hong Hu Peng-Fei Zhang Jun-Jie Wang Qi zhi Hong-Sheng huang Na yin Yue Wang Tian-Chen Ge National Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao 266580ShandongChina School of Geosciences China University of Petroleum(East China)Qingdao 266580ShandongChina Sanya Offshore Oil&Gas Research Institute Northeast Petroleum UniversitySanya 572025HainanChina College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590ShandongChina

The occurrence characteristics of shale oil are of great significance to the movability of shale *** this study,the occurrence characteristics of oil in the shale matrix at Funing Formation shale in Subei Basin were quantitatively evaluated by organic geochemistry and microscopic pore structure characterization *** Multiple Isothermal Stages Pyrolysis(MIS)experiment results show that the content of total oil,adsorbed oil,and free oil in the shales are 3.15-11.25 mg/g,1.41-4.95 mg/g,and 1.74-6.51 mg/g,*** which the silicon-rich shale has the best *** relative content of free oil shows an increasing trend in pores with pore diameters greater than 3 *** the relative content of free oil reaches 100%,the pore size of silicon-rich shale is about 200 nm,while that of calcium-rich shale,clay-rich shale,and siliceous mixed shale is about 10 *** occurrence law of adsorbed oil is opposite to that of free oil,which indicates that shale oil will occur in the pores and fractures in a free state in a more extensive pore size range(>200 nm).This study also enables us to further understand the occurrence characteristics of shale oil under the interaction of occurrence state and occurrence space.

关键词： Shale oil Occurrence characteristics Sequential solvent extraction Low-temperature nitrogen adsorption Funing Formation Dongtai Depression

Quantifying the Tension between Cosmological Models and JWST Red Candidate Massive Galaxies

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Research in Astronomy and Astrophysics 2024年第4期24卷 1-6页

作者： Jun-Chao Wang zhi-Qi huang Lu huang Jianqi Liu School of Physics and Astronomy Sun Yat-sen UniversityZhuhai 519082China CSST Science Center for the Guangdong-Hong Kong-Macao Greater Bay Area Zhuhai519082China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China

We develop a Python tool to estimate the tail distribution of the number of dark matter halos beyond a mass threshold and in a given volume in a *** code is based on the extended Press-Schechter model and is computationally efficient,typically taking a few seconds on a personal laptop for a given set of cosmological *** high efficiency of the code allows a quick estimation of the tension between cosmological models and the red candidate massive galaxies released by the James Webb Space Telescope,as well as scanning the theory space with the Markov Chain Monte Carlo *** an example application,we use the tool to study the cosmological implication of the candidate galaxies presented in Labbéet *** standard Λcold dark matter(ΛCDM)model is well consistent with the data if the star formation efficiency can reach~0.3 at high *** a low star formation efficiency ε~0.1,theΛCDM model is disfavored at~2σ-3σconfidence level.

关键词： (cosmology:)cosmological parameters Galaxy:abundances Galaxy:formation