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A confined growth strategy to construct 3DOM SiO_(2) nanoreactor insitu embedded Co_(3)O_(4) nanoparticles catalyst for the catalytic combustion of VOCs:Superior h_(2)O and SO_(2) resistance

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Nano Research 2024年第1期17卷 207-220页

作者： Weigao han Sh.l.n Wu Fang Dong Weiliang han Yinghao Chu linghui Su Zhicheng Tang State Key laboratory for Oxo Synthesis and Selective Oxidation National Engineering Research Center for Fine Petrochemical IntermediatesLanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Dalian National laboratory for Clean Energy Dalian 116023China College of Architecture and Environment Sichuan UniversityChengdu 610000China

SO_(2)poisoning is a common problem in the catalytic combustion of volatile organic compounds(VOCs).In this work,we took three-dimensionally ordered macroporous and mesoporous(3DOM)SiO_(2)as the nanoreactor to protect active sites from SO_(2)erosion in the catalytic combustion of ***,the confined growth of metal active nanoparticles in the multi-stage pore is also full of *** we successfully confined Co_(3)O_(4)nanoparticles(NPs)in macroporous and mesoporous ***,the precursors’growth in the pore was controlled and nanoreactors with different pore sizes were prepared by adjusting the loading amount and preparation *** is discovered that the Co_(3)O_(4)NPs confined in 3DOM SiO_(2)nanoreactor showed superior sulfur and water *** functional theory(DFT)calculations verified that the Co-Si catalyst had high SO_(2)adsorption energy(-0.48 eV),which illustrated that SO_(2)was hard to attach to the surface of the Co-Si *** SiO_(2)nanoreactor had low SO_(2)adsorption energy(-5.15 eV),which indicated that SO_(2)was easily absorbed on SiO_(2)*** illustrated that the SiO_(2)nanoreactor could protect effectively active sites from SO_(2)erosion.

关键词： zeolitic imidazolate frameworks(ZIFs) Co_(3)O_(4) benzene catalytic combustion nanoreactor sulfur and water resistance

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Editorial of special issue on quantum imaging

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Chinese Optics letters 2024年第6期22卷 1-2页

作者： Yanhua Shih Shensheng han University of Maryland Baltimore CountyUSA Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesChina

Quantum detection technology and quantum imaging based on two-photon interference effects, along with various new conceptual imaging schemes inspired by the two-photon interference quantum imaging, have significantly redefined the sight and content of imaging technology. This has rejuvenated the ancient discipline of imaging science, transforming it into a burgeoning field at the intersection of statistical and quantum optics, information science, applied mathematics, artificial intelligence, computer vision, light field manipulation technology, and compressive sensing technology. These advancements provide practical and innovative technological approaches to greatly enhance the capability and efficiency of image information acquisition in various application ***.

关键词： quantum optics intersection

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Some properties of Melnikov functions near a cuspidal loop

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Science China Mathematics 2024年第4期67卷 767-786页

作者： Junmin Yang Maoan han School of Mathematical Sciences Hebei Normal UniversityShijiazhuang 050024China Department of Mathematics Zhejiang Normal UniversityJinhua 321004China

In this paper,we consider the first-order Melnikov functions and limit cycle bifurcations of a nearhamiltonian system near a cuspidal *** establishing relations between the coefficients in the expansions of the two Melnikov functions,we give a general method to obtain the number of limit cycles near the cuspidal *** an application,we consider a kind of liénard systems and obtain a new estimation on the lower bound of the maximum number of limit cycles.

关键词： Melnikov function nilpotent cusp limit cycle bifurcation

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Black-box membership inference attacks based on shadow model

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The Journal of China Universities of Posts and Telecommunications 2024年第4期31卷 1-16页

作者： han Zhen Zhou Wen'an han Xiaoxuan Wu Jie School of Computer Science Beijing University of Posts and TelecommunicationsBeijing 100876China

Membership inference attacks on machine learning models have drawn significant *** current research primarily utilizes shadow modeling techniques,which require knowledge of the target model and training data,practical scenarios involve black-box access to the target model with no available *** training data further complicate the implementation of these *** this paper,we experimentally compare common data enhancement schemes and propose a data synthesis framework based on the variational autoencoder generative adversarial network(VAE-GAN)to extend the training data for shadow ***,this paper proposes a shadow model training algorithm based on adversarial training to improve the shadow model's ability to mimic the predicted behavior of the target model when the target model's information is *** conducting attack experiments on different models under the black-box access setting,this paper verifies the effectiveness of the VAE-GAN-based data synthesis framework for improving the accuracy of membership inference ***,we verify that the shadow model,trained by using the adversarial training approach,effectively improves the degree of mimicking the predicted behavior of the target *** with existing research methods,the method proposed in this paper achieves a 2%improvement in attack accuracy and delivers better attack performance.

关键词： machine learning membership inference attack shadow model black-box model

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high.l.af area index expands the contrasting effect of climate warming on Western Siberia taiga forests activity before and after 2000

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Journal of Geographical Sciences 2024年第1期34卷 131-145页

作者： SUN han WANG Xiangping State Key laboratory of Efficient Production of Forest Resources Beijing Forestry UniversityBeijing 100083China School of Ecology and Nature Conservation Beijing Forestry UniversityBeijing 100083China

The taiga vegetation in Western Siberia has been seriously threatened by climate warming in recent ***,how vegetation in different growing states and climate conditions responds to climate changes differently is still *** we explore the vegetation activity trends in Western Siberia taiga forests using the annual rate of change in leaf area index(lAI)during 1982–2018 so as to answer two questions:(1)how did climate warming affect taiga vegetation activity in the recent last decades?(2)Did the growing state of taiga forest affect its response to climate warming?Our results revealed that climate warming promoted taiga vegetation activity in Western Siberia before ***,continuous warming caused excessive evapotranspiration and led to decreased vegetation activity after ***,the intensity of vegetation growth response to warming was positively related to canopy height and lAI,indicating that both the positive and negative effects of warming were more significant in taiga forests in better growing *** these forests generally have higher productivity and play more important roles in ecosystem functioning(e.g.,carbon sink and biodiversity conservation),our results highlight their vulnerability to future climate change that need more research attention.

关键词： climate warming taiga forest leaf area index(lAI) vegetation activity Western Siberia

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Sec-Auditor:A Blockchain-Based Data Auditing Solution for Ensuring Integrity and Semantic Correctness

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Computers, Materials & Continua 2024年第8期80卷 2121-2137页

作者： Guodong han hecheng li College of Computer Qinghai Normal UniversityXining810008China

Currently,there is a growing trend among users to store their data in the ***,the cloud is vulnerable to persistent data corruption risks arising from equipment failures and hacker ***,when users perform file operations,the semantic integrity of the data can be *** both data integrity and semantic correctness has become a critical issue that requires *** introduce a pioneering solution called Sec-Auditor,the first of its kind with the ability to verify data integrity and semantic correctness simultaneously,wh.l. maintaining a constant communication cost independent of the audited data ***-Auditor also supports public auditing,enabling anyone with access to public information to conduct data *** feature makes Sec-Auditor highly adaptable to open data environments,such as the *** Sec-Auditor,users are assigned specific rules that are utilized to verify the accuracy of data ***,users are given the flexibility to update their own rules as *** conduct in-depth analyses of the correctness and security of *** also compare several important security attributes with existing schemes,demonstrating the superior properties of *** results demonstrate that even for time-consuming file upload operations,our solution is more efficient than the comparison one.

关键词： Provable data possession public auditing cloud storage data integrity semantic correctness

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Prediction and Output Estimation of Pattern Moving in Non-Newtonian Mechanical Systems Based on Probability Density Evolution

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Computer Modeling in Engineering & Sciences 2024年第4期139卷 515-536页

作者： Cheng han Zhengguang Xu School of Automation and Electrical Engineering University of Science and Technology BeijingBeijing100083China Key laboratory of Knowledge Automation for Industrial Processes University of Science and Technology BeijingBeijing100083China

A prediction framework based on the evolution of pattern motion probability density is proposed for the output prediction and estimation problem of non-Newtonian mechanical systems,assuming that the system satisfies the generalized lipschitz *** a complex nonlinear system primarily governed by statistical laws rather than Newtonian mechanics,the output of non-Newtonian mechanics systems is difficult to describe through deterministic variables such as state variables,which poses difficulties in predicting and estimating the system’s *** this article,the temporal variation of the system is described by constructing pattern category variables,which are non-deterministic *** pattern category variables have statistical attributes but not operational attributes,operational attributes are assigned to them by posterior probability density,and a method for analyzing their motion laws using probability density evolution is ***,a data-driven form of pattern motion probabilistic density evolution prediction method is designed by combining pseudo partial derivative(PPD),achieving prediction of the probability density satisfying the system’s output *** on this,the final prediction estimation of the system’s output value is realized by minimum variance unbiased ***,a corresponding PPD estimation algorithm is designed using an extended state observer(ESO)to estimate the parameters to be estimated in the proposed prediction *** effectiveness of the parameter estimation algorithm and prediction method is demonstrated through theoretical analysis,and the accuracy of the algorithm is verified by two numerical simulation examples.

关键词： Non-newtonian mechanical systems prediction and estimation pattern moving probability density evolution pseudo partial derivative

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Analyses on an electronic voltage transformer's failure by its resonance with very fast transient overvoltage and suppression

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high Voltage 2024年第1期9卷 150-162页

作者： Ruoyu han houda Zhu Qing Chen hongbin li Yue Tong linshan han Yang Jiao School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhanChina China Electric Power Research Institute WuhanChina School of Artificial Intelligence and Automation Huazhong University of Science and TechnologyWuhanChina

As voltage measuring devices are widely used in the high voltage power system with a primary-secondary-fusion structure,electronic voltage transformers are directly connected to the primary conductor and would face much more serious electromagnetic environments than general secondary *** a result,they would still experience failures even when general protection measures are adopted to suppress overvoltages'*** address this issue,an innovative method is proposed after analyses are conducted on the resonance between a transformer and an *** this method,an air-cored coil is installed in a transformer to artificially shift its natural frequency and to dodge the high-frequency dominant component of a transient overvoltage,avoiding the aforementioned resonance and suppressing the secondary *** addition,simulations and laboratory tests are conducted to prove this method's validity.

关键词： transient resonance mentioned

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On Stability Discrimination of limit Cycles for Piecewise Smooth Systems

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Acta Mathematica Sinica,English Series 2024年第7期40卷 1785-1803页

作者： Mao An han Xia Yu ZhOU School of Mathematical Sciences Zhejiang Normal UniversityJinhua321004P.R.China

This paper is concerned with the problem of stability discrimination of limit cycles for piecewise smooth *** first establish the Poincaré map near a periodic orbit,and deduce the first order derivative of the map for general piecewise smooth systems on the ***,we obtain a sufficient condition for determining the stability of limit cycles for these systems.

关键词： Piecewise smooth system limit cycle stability

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Critical layer in liquid-solid system influencing the remediation of chromium using zeolite-supported sulfide nano zero-valent iron

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Journal of Environmental Sciences 2024年第1期135卷 232-241页

作者： Chundi Zhou Caiyun han Nengsheng liu Faculty of Material and Environment Guangxi University for NationalitiesNanning 530008China College of Environmental Science and Engineering Tongji UniversityShanghai 200092China Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093China

Sulfidated nano zero-valent iron particles were immobilized on ZSM-5 zeolite(Z/S-nZⅥ)and used for hexavalent chromium(Cr(Ⅵ))*** performance of Z/S-nZⅥimproved with the increase in Cr(Ⅵ)concentration(l),wh.l. the performance significantly decreased for a Cr(Ⅵ)concentration of more than 60 mg/*** adsorption behavior for Cr(Ⅵ)was different from that reported in previous *** improved performance can be tailored for increasing efficiency of nano zero-valent iron(nZⅥ)corrosion,wh.l. the degree of corrosion of nZⅥwas affected by the concentration of the pollutant as discussed by kinetics,X-ray diffraction(XRD)and X-ray photoelectron spectrometer(XPS)*** experiments for the dissolution of ferrous ions and the dosage of adsorbent demonstrated that the critical layer in the liquid-solid system changed with the increase in the concentration of Cr(Ⅵ)(Cr(Ⅵ):Z/S-nZⅥ>0.6).Moreover,the removal mechanisms of Cr(Ⅵ)were elucidated through XRD,transmission electron microscopy(TEM)and XPS *** results demonstrate that the species of chromium in the critical layer changed from Cr(Ⅲ)to Cr(Ⅵ)as the concentration of chromium increased from low to ***,the critical layer was composed of Cr(Ⅵ),Fe(Ⅱ),O and h ***,the experiments of coexisting ions and aging time confirmed that Z/S-nZⅥpossessed high selectivity and stability to ensure efficiency and cost-effectiveness in practical applications.

关键词： Cr(VI) Corrosion Critical layer Selectivity Stability

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