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Chinese Journal of Chemical Engineering 2024年第2期66卷 40-50页

作者： Yi-Fei Liang Jin-Rong Lu shang-kun tian Wen-Quan Cui Li Liu Hebei Provincial Key Laboratory of Environmental Photocatalytic and Electrocatalytic Materials College of Chemical EngineeringNorth China University of Science and TechnologyTangshan 063210China

For the use of green hydrogen energy,it is crucial to have efficient photocatalytic activity for hydrogen generation by water reforming of methanol under mild *** attention has been paid to gC_(3)N_(4)as a promising photocatalyst for the generation of *** improve the separation of photogenerated charge,porous nanosheet g-C_(3)N_(4)was modified with Pt nanoclusters(Pt/g-C_(3)N_(4))through impregnation and following photo-induced *** catalyst showed excellent photocatalytic activity of water reforming of methanol fo r hydrogen production with a 17.12 mmol·g^(-1)·h^(-1)rate at room temperature,which was 311 times higher than that of the unmodified g-C_(3)N_(4).The strong interactions of Pt-N in Pt/g-C_(3)N_(4)constructed effective electron transfer channels to promote the separation of photogenerated electrons and holes *** addition,in-situ infrared spectroscopy was used to investigate the intermediates of the hydrogen production reaction,which proved that methanol and water eventually turn into H_(2)and CO_(2)via formaldehyde and *** study provides insights for understanding the photocatalytic hydrogen production in the water reforming of methanol.

关键词： Water reforming of methanol Photocatalysis g-C_(3)N_(4) Pt nanoclusters Hydrogen production

Optimal Risk Sharing for Maxmin Choquet Expected Utility Model

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Acta Mathematicae Applicatae Sinica 2024年第2期40卷 430-444页

作者： De-jian tian shang-ri WU School of Mathematics China University of Mining and TechnologyXuzhou 221116China

This article analyzes the Pareto optimal allocations,agreeable trades and agreeable bets under the maxmin Choquet expected utility(MCEU)*** provide several useful characterizations for Pareto optimal allocations for risk averse *** derive the formulation descriptions for non-existence agreeable trades or agreeable bets for risk neutral *** build some relationships between ex-ante stage and interim stage on agreeable trades or bets when new information arrives.

关键词： maxmin Choquet expected utility model Pareto optimal allocation agreeable trade agreeable bet

Study of Pyrolysis Characteristics and Kinetic Analysis of Shenmu Coal at a High Heating Rate Using TG-FTIR

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China Petroleum Processing & Petrochemical Technology 2024年第1期26卷 47-55页

作者： An Xiaoxi Zhang Yanpeng shang Yanchao tian Yuanyu Qiao Yingyun Shandong University of Science and Technology Qingdao 266510ShandongChina China University of Petroleum(Huadong) Qingdao 266555ShandongChina

Coal pyrolysis is a fundamental reaction in the thermal processing and utilization of *** the behavior and kinetics of coal pyrolysis is crucial for optimizing,designing,and developing a composite riser for the staged pyrolysis gasification process of pulverized *** this study,the non-isothermal pyrolysis behavior and kinetics of coal were examined at different heating rates(30,50,100,300,500,700,and 900℃/min)using thermogravimetry(TG)coupled with Fourier-transform infrared *** of the TG/derivative TG(TG/DTG)curves indicated that coal pyrolysis mainly occurred between 300℃ and 700℃.Higher heating rates led to more volatiles being released from the coal,and a higher temperature was required to achieve rapid *** analysis showed that both the model-free methods(Friedman,Flynn-Wall-Ozawa,and Kissinger-Akahira-Sunose)and the model-based method(Coats-Redfern)effectively describe the coal pyrolysis *** change in the Ea values between the two kinetic models was consistent throughout the pyrolysis process,and the most probable mechanism was the F2 model(secondary chemical reaction).In addition,the heating rate did not change the overall reaction order of the pyrolysis process;however,a higher heating rate resulted in a decrease in the Ea value during the initial pyrolysis stage.

关键词： coal pyrolysis TG-FTIR characteristic parameters dynamics

Ultralow-phase-noise and broadband frequency-hopping coupled optoelectronic oscillator under quiet point operation

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Photonics Research 2024年第8期12卷 1785-1793页

作者： HUI LIU MINGYANG GUO tian ZHANG JIAN DAI kun XU State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China

Advancements in microwave photonics have yielded novel approaches for generating high-purity microwave *** these,optoelectronic oscillators(OEOs)and coupled optoelectronic oscillators(COEOs)have demonstrated the capability to generate frequency-independent microwaves with exceptionally low phase ***,the tunability of the oscillators is rather limited due to the necessity for narrowband electronic bandpass filters,presenting challenges in achieving both wide and rapid tuning ***,we present a COEO featuring ultralow phase noise,flexible tuning capability,and high *** is achieved through a quiet point(QP)-operated harmonic mode-locked fiber laser,which effectively mitigates optical amplifier noise and supermode competition,thus significantly diminishing the necessity for ultra-narrow electronic *** to the liberated tuning ability,we present an oscillator that can be tuned from 2 GHz to 18 GHz,with phase noise as low as-140 d Bc/Hz at 10 k Hz under the QP *** then illustrate the practical application of the proposed oscillator in generating frequency-hopping signals with consistent spurious modes less than-85 d Bc,absolute phase noise below-135 d Bc/Hz at 10 k Hz,hopping resolution of 1.25 MHz,and fractional frequency stability below 6.1×10^(-12)at 1 s averaging time when locked to a *** presented COEO structure emerges as a compelling solution for agile and low-noise microwave sources in advanced wireless communication and radar systems.

关键词： optoelectronic tuning amplifier

Exploration of heavy Higgs bosons at a 100 TeV hadron collider within the semi-constrained next-to-minimal supersymmetric standard model

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Chinese Physics C 2024年第9期48卷 107-117页

作者： kun Wang Pengfu tian Jingya Zhu College of Science University of Shanghai for Science and TechnologyShanghai 200093China School of Physics and Technology Wuhan UniversityWuhan 430072China School of Physics and Electronics Henan UniversityKaifeng 475004China

In this study,we explore the detectability of heavy Higgs bosons in the pp→bbH/A→bbtt channel at a100 TeV hadron collider within the semi-constrained next-to-minimal supersymmetric standard *** calculate their production cross sections and decay branching ratios and compare them with simulation results from *** focus on the heavy doublet-dominated CP-even Higgs H and CP-odd Higgs A,with mass limits set below 10TeV to ensure *** a collider with an integrated luminosity of 3 ab^(-1),the potential for detecting heavy Higgs bosons varies significantly with their mass and tanβ.Heavy Higgs bosons with masses below 2 TeV are within the testable range,while those heavier than 7 TeV are below the exclusion and discovery thresholds,rendering them *** masses between 2 and 7 TeV,heavy Higgs bosons with tanβ smaller than 20 can be detected,whereas those with tanβ larger than 20 are beyond the current discovery or exclusion capabilities.

关键词： next-to-minimal supersymmetric standard model heavy Higgs boson 100 TeV hadron collider

A theoretical study on gaseous pollutant flushing of natural ventilation driven by buoyancy forces in industrial buildings

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Building Simulation 2024年第4期17卷 575-589页

作者： Jiawei Zhuang Genyang Chen Rumeng Yang kun Han Dongdong tian Yongfa Diao Henggen Shen School of Urban Construction Changzhou UniversityChangzhou213164China School of Petroleum and Natural Gas Engineering School of EnergyChangzhou UniversityChangzhou213164China College of Environmental Science and Engineering Donghua UniversityShanghai201620China School of Architecture and Urban Planning Nanjing UniversityNanjing210093China

The acceleration of industrialization worsening indoor environments of industrial buildings has drawn more attention in recent *** ventilation can improve indoor air quality(IAQ)and reduce carbon *** evaluate gaseous pollutant levels in industrial buildings for the development of buoyancy-driven natural ventilation,two theoretical models of pollutant flushing(Model I and Model II)are developed based on the existing thermal stratification theory in combination with the mixing characteristics of lower *** results show that indoor pollutant flushing is mainly dependent on the pollution source intensity and effective ventilation *** mixing characteristics of lower pollutant has an important effect on pollutant stratification and evolution during ventilation,but it does not change the prediction results at steady *** the dimensionless pollution source intensity is larger than 1,the pollution source should be cleaned up or other ventilation methods should be used instead to improve *** addition,the comparisons between Model I and Model II on instantaneous pollutant concentration are significantly influenced by the pollution source intensity,and the actual pollutant concentration is more likely to be between the predicted values of Model I and Model *** reduce pollutant concentration to a required level,the pollution source intensity should be in a certain *** theoretical models as well as the necessary conditions for ventilation effectiveness obtained can be used for the ventilation optimization design of industrial buildings.

关键词： industrial buildings buoyancy-driven natural ventilation gaseous pollutants evolution model pollution sources

Suppressing a mitochondrial calcium uniporter activates the calcium signaling pathway and promotes cell elongation in cotton

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The Crop Journal 2024年第2期12卷 411-421页

作者： Yujia Duan Xiaoguang shang Ruiping tian Weixi Li Xiaohui Song Dayong Zhang Wangzhen Guo State Key Laboratory of Crop Genetics&Germplasm Enhancement and Utilization Nanjing Agricultural UniversityNanjing 210095JiangsuChina Engineering Research Center of Ministry of Education for Cotton Germplasm Enhancement and Application Nanjing Agricultural UniversityNanjing 210095JiangsuChina

Mitochondrial calcium uniporter(MCU)is a conserved calcium ion(Ca^(2+))transporter in the mitochondrial inner membrane of eukaryotic *** MCU proteins regulate Ca^(2+)flow and modulate plant cell development remain largely ***,we identified the gene GhMCU4 encoding a MCU protein that negatively regulates plant development and fiber elongation in cotton(Gossypium hirsutum).GhMCU4expressed constitutively in various tissues with the higher transcripts in elongating fiber *** of GhMCU4 in cotton significantly elevated the plant height and root *** calcium signaling pathway was significantly activated and calcium sensor genes,including Ca^(2+)dependent modulator of interactor of constitutively active ROP(GhCMI1),calmodulin like protein(GhCML46),calciumdependent protein kinases(GhCPKs),calcineurin B-like protein(GhCBLs),and CBL-interacting protein kinases(GhCIPKs),were dramatically upregulated in GhMCU4-silenced *** processes were preferentially enriched,and genes related to regulation of transcription were upregulated in GhMCU4-silenced *** contents of Ca^(2+)and H_(2)O_(2)were significantly increased in roots and leaves of GhMCU4-silenced *** length and Ca^(2+)and H_(2)O_(2)contents in fibers were significantly increased in GhMCU4-silenced *** study indicated that GhMCU4 plays a negative role in regulating cell elongation in cotton,thus expanding understanding in the role of MCU proteins in plant growth and development.

关键词： Calcium signaling Hydrogen peroxide Metabolic processed Gossypium hirsutum

The Anti-Penetration Performance and Mechanism of Metal Materials:A Review

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Engineering 2024年第9期40卷 131-157页

作者： Jialin Chen Shutao Li shang Ma Yeqing Chen Yin Liu Quanwei tian Xiting Zhong Jiaxing Song State Key Laboratory of Target Vulnerability Assessment Beijing 100036China Institute of Defense Engineering Academy of Military SciencePLABeijing 100036China Xi’an Rare Metal Materials Institute Co. Ltd.Xi’an 710016China

This article reviews the anti-penetration principles and strengthening mechanisms of metal materials,ranging from macroscopic failure modes to microscopic structural characteristics,and further summarizes the micro-macro correlation in the anti-penetration ***,it outlines the constitutive models and numerical simulation studies utilized in the field of impact and *** the macro perspective,nine frequent penetration failure modes of metal materials are summarized,with a focus on the analysis of the cratering,compression shear,penetration,and plugging stages of the penetration *** reasons for the formation of adiabatic shear bands(ASBs)in metal materials with different crystal structures are elaborated,and the formation mechanism of the equiaxed grains in the ASB is *** the strength and the toughness of metal materials are related to the materials’crystal structures and *** toughness is mainly influenced by the deformation mechanism,while the strength is explained by the strengthening ***,the mechanical properties of metal materials depend on their microstructures,which are subject to the manufacturing process and material *** numerical simulation,the advantages and disadvantages of different constitutive models and simulation methods are summarized based on the application characteristics of metal materials in high-speed penetration *** summary,this article provides a systematic overview of the macroscopic and microscopic characteristics of metal materials,along with their mechanisms and correlation during the anti-penetration and impact-resistance processes,thereby making an important contribution to the scientific understanding of anti-penetration performance and its optimization in metal materials.

关键词： Metal materials Failure model Adiabatic shear band Strengthening mechanisms Numerical simulation

Multidomain Correlation-Based Multidimensional CSI Tensor Generation for Device-FreeWi-Fi Sensing

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Computer Modeling in Engineering & Sciences 2024年第2期138卷 1749-1767页

作者： Liufeng Du Shaoru shang Linghua Zhang Chong Li JianingYang Xiyan tian School of Mechanical and Electrical Engineering Henan Institute of Science and TechnologyXinxiang453003China School of Communications and Information Engineering Nanjing University of Posts and TelecommunicationsNanjing210003China School of Mechatronic Engineering and Automation Shanghai UniversityShanghai200444China

Due to the fine-grained communication scenarios characterization and stability,Wi-Fi channel state information(CSI)has been increasingly applied to indoor sensing tasks *** spatial variations are explicitlyreflected in CSI measurements,the representation differences caused by small contextual changes are easilysubmerged in the fluctuations of multipath effects,especially in device-free Wi-Fi *** existing datasolutions cannot fully exploit the temporal,spatial,and frequency information carried by CSI,which results ininsufficient sensing resolution for indoor scenario *** a result,the well-liked machine learning(ML)-based CSI sensing models still struggling with stable *** paper formulates a time-frequency matrixon the premise of demonstrating that the CSI has low-rank potential and then proposes a distributed factorizationalgorithm to effectively separate the stable structured information and context fluctuations in the CSI ***,a multidimensional tensor is generated by combining the time-frequency gradients of CSI,which containsrich and fine-grained real-time contextual *** evaluations and case studies highlight thesuperiority of the proposal.

关键词： Wi-Fi sensing device-free CSI low-rank matrix factorization

Ada-FFL:Adaptive computing fairness federated learning

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CAAI Transactions on Intelligence Technology 2024年第3期9卷 573-584页

作者： Yue Cong Jing Qiu kun Zhang Zhongyang Fang Chengliang Gao Shen Su Zhihong tian The Cyberspace Institute of Advanced Technology Guangzhou UniversityGuangzhouChina Pengcheng Lab ShenzhenChina Carnegie Mellon University PittsburghPennsylvaniaUSA Mohamed Bin Zayed University of Artificial Intelligence Abu DhabiUnited Arab Emirates

As the scale of federated learning expands,solving the Non-IID data problem of federated learning has become a key challenge of *** existing solutions generally aim to solve the overall performance improvement of all clients;however,the overall performance improvement often sacrifices the performance of certain clients,such as clients with less *** fairness may greatly reduce the willingness of some clients to participate in federated *** order to solve the above problem,the authors propose Ada-FFL,an adaptive fairness federated aggregation learning algorithm,which can dynamically adjust the fairness coefficient according to the update of the local models,ensuring the convergence performance of the global model and the fairness between federated learning *** integrating coarse-grained and fine-grained equity solutions,the authors evaluate the deviation of local models by considering both global equity and individual equity,then the weight ratio will be dynamically allocated for each client based on the evaluated deviation value,which can ensure that the update differences of local models are fully considered in each round of ***,by combining a regularisation term to limit the local model update to be closer to the global model,the sensitivity of the model to input perturbations can be reduced,and the generalisation ability of the global model can be *** numerous experiments on several federal data sets,the authors show that our method has more advantages in convergence effect and fairness than the existing baselines.

关键词： adaptive fariness aggregation fairness federated learning non-IID