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Improving benzene catalytic oxidation on Ag/co_(3)O_(4) by regulating the chemical states of co and Ag

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Journal of Environmental Sciences 2024年第9期143卷 201-212页

作者： Hao guo Tao guo Mengqi Zhao Yaxin Zhang Wenfeng Shangguan Yinnian Liao State Key Laboratory of chemistry and Utilization of carbon Based Energy Resources Xinjiang UniversityXinjiang 830017China Xinjiang Key Laboratory of coal clean conversion&chemical Engineering Process Xinjiang UniversityXinjiang 830017China School of chemical Engineering and Technology Xinjiang UniversityXinjiang 830017China Research center for combustion and Environmental Technology Shanghai Jiao Tong UniversityShanghai 200240China School of Applied chemistry and Materials Zhuhai College of Science and TechnologyGuangdong 519041China

Silver(9 wt.%)was loaded on co_(3)O_(4)-nanofiber using reduction and impregnation methods,*** to the stronger electronegativity of silver,the ratios of surface co^(3+)/co^(2+) on Ag/co_(3)O_(4) were higher than on co_(3)O_(4),which further led to more adsorbed oxygen species as a result of the charge ***,the introducing of silver also obviously improved the reducibility of co_(3)O_(4).Hence the Ag/co_(3)O_(4) showed better catalytic performance than co_(3)O_(4) in benzene *** with the Ag/co_(3)O_(4) synthesized via impregnation method,the one prepared using reduction method(named as Ag co-R)exhibited higher contents of surface co^(3+) and adsorbed oxygen species,stronger reducibility,as well as more active surface lattice oxygen ***,Ag co-R showed lowest T_(90) value of 183℃,admirable catalytic stability,largest normalized reaction rate of1.36×10^(-4)mol/(h·m^(2))(150℃),and lowest apparent activation energy(E_(a))of 63.2 kJ/*** analyzing of in-situ DRIFTS indicated benzene molecules were successively oxidized to phenol,o-benzoquinone,small molecular intermediates,and finally to cO_(2) and water on the surface of Ag *** last,potential reaction pathways including five detailed steps were proposed.

关键词： Reduction method co_(3)O_(4)-supported Ag catalyst,VOcs Benzene oxidation Reaction mechanism

Solid Desiccant Heat Pump Fresh Air Unit using composite Silica Gel

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Journal of Thermal Science 2024年第4期33卷 1286-1300页

作者： YANG Tianyu guo Defang GE Tianshu Institute of Refrigeration and cryogenics Shanghai Jiao Tong UniversityKey Laboratory of Power Mechanical EngineeringMOE ChinaShanghai200240China Qingdao Haier A/c Electronic co. LtdQingdao266101China

The introduction of fresh air into the indoor space leads to a significant increase in cooling or heating *** desiccant heat pump fresh air unit which can handle the latent and sensible load of fresh air efficiently have been proposed *** improve the performance of the solid desiccant heat pump fresh air unit in the fresh air handling process,in this paper,the application of composite silica gel in a heat pump fresh air unit was *** comparison between silica gel coating(SGc)and composite silica gel coating(cSGc)shows that the adsorption rate and water uptake capacity of cSGc are more than two times higher than those of *** experimental setup for the solid desiccant heat pump fresh air unit was *** performance of SGc and cSGc was tested in the setup *** show that under summer conditions,compared with the solid desiccant heat pump fresh air unit using silica gel(SGFU),the average moisture removal and cOP of the one using composite silica gel(cSGFU)increased by 15%and 30%,*** winter conditions,compared with SGFU,the average humidification and cOP of cSGFU increased by 42%and 17%.With optimal operation conditions of 3 min switchover time and 40 r/s compressor frequency,the cOP of cSGFU under summer conditions can reach *** also show that the cSGFU and SGFU have higher cOP and dehumidification rate under higher outdoor temperature and humidity ratio.

关键词： fresh air system desiccant coated heat exchanger humidification dehumidification experimental comparison

Discovery potential of the Glashow resonance in an air shower neutrino telescope

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chinese Physics c 2024年第8期48卷 266-275页

作者： guo-Yuan Huang School of Mathematics and Physics China University of GeosciencesWuhan 430074China Max-Planck-Institut für Kernphysik Saupfercheckweg 169117 HeidelbergGermany

The in-ice or in-water cherenkov neutrino telescope,such as Icecube,has already proved its power in measuring the Glashow resonance by searching for the bump around E_(ν)=6.3PeV arising from the W-boson *** are many proposals for the next few decades for observations of cosmic tau neutrinos with extensive air showers,also known as tau neutrino *** air shower telescope is,in principle,sensitive to the Glashow resonance via the channel W→τν_(τ)followed by the tau decay in the air(e.g.,TAMBO,which has a geometric area of approximately 500km^(2)).Using a thorough numerical analysis,we find that the discovery significance can be up to 90%with a TAMBO-like setup if PeV neutrinos primarily originate from neutron decays,considering the flux parameters measured by Icecube as the *** presence of new physics affecting the neutrino flavor composition can also increase the ***,if ultrahigh-energy neutrinos are dominantly produced from meson decays,it will be statistically difficult for an advanced proposal such as TAMBO to discriminate the Glashow resonance induced byν¯e from the intrinsicντ/ν¯_(τ)*** have identified several limitations for such advanced telescopes,in comparison with the in-ice or in-water telescope,when measuring resonances:(i)a suppressed branching ratio of 11%for the decay W→τν_(τ);(ii)the smearing effect and reduced acceptance because the daughter neutrino takes away(y)∼75%of the energy from the W decay;and(iii)a large attenuation effect for Earth-skimming neutrinos with the resonance.

关键词： Ultrahigh-energy neutrinos Neutrino telescopes Glashow resonance

Optimal regularity of positive solutions of the Hénon-Hardy equation and related equations

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Science china Mathematics 2024年第10期67卷 2283-2302页

作者： Zongming guo Fangshu Wan college of Mathematics and Information Science Henan Normal UniversityXinxiang 453007China School of Mathematical Sciences University of Science and Technology of ChinaHefei 230026China School of Mathematical Sciences Anhui UniversityHefei 230601China

We present a new method to determine the optimal regularity of positive solutions u∈c^(4)(Ω\{0})∩c^(0)(Ω) of the Hénon-Hardy equation,i.e.,Δ^(2)u=|x|^(α)u^(p)inΩ,(0,1) where Ω■RN(N≥4) is a bounded smooth domain with 0∈Ω,α>-4,and p∈*** is clear that 0 is an isolated singular point of solutions of(0.1) and the optimal regularity of u in Ω relies on the parameter α.It is also important to see that the regularity of u at x=0 determines the regularity of u in Ω.We first establish asymptotic expansions up to arbitrary orders at x=0 of prescribed positive solutions u ∈c^(4)(Ω{0}) ∩ c^(0)(Ω)of(0.1).Then we show that the regularity at x=0 of each positive solution u of(0.1) can be determined by some terms in asymptotic expansions of the related positive radial solution of the equation(0.1) with Ω=B,where B is the unit ball of R^(N).The main idea works for more general equations with singular weights.

关键词： H´enon-Hardy equation positive solutions optimal regularity singular point asymptotic expansions

MD Simulation of Diffusion Behaviors in collision Welding Processes of Al-cu, Al-Al, cu-cu

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computers, Materials & continua 2024年第6期79卷 3455-3468页

作者： Dingyi Jin guo Wei School of Intelligent Manufacturing Hunan First Normal UniversityChangsha410082China School of Physics and Technology Center for Ion Beam ApplicationHubei Nuclear Solid Physics Key LaboratoryWuhan UniversityWuhan430072China

To investigate the effects of material combinations and velocity conditions on atomic diffusion behavior near collision interfaces,this study simulates the atomic diffusion behavior near collision interfaces in cu-Al,Al-Al and cu-cu combinations fabricated through collision welding using molecular dynamic(MD)*** atomic diffusion behaviors are compared between similar metal combinations(Al-Al,cu-cu)and dissimilar metal combinations(Al-cu).By combining the simulation results and classical diffusion theory,the diffusion coefficients for similar and dissimilar metal material combinations under different velocity conditions are *** effects of material combinations and collision velocity on diffusion behaviors are also *** diffusion behaviors of dissimilar material combinations strongly depend on the transverse velocity,whereas those of the similar material combinations are more dependent on the longitudinal *** findings can provide guidance for optimizing welding parameters.

关键词： Atomic diffusion behavior molecular dynamics collision welding

Recent Advances in Pd-catalyzed Reactions Involving the “On-Water” Mechanism

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chinese Journal of chemistry 2024年第5期42卷 533-542页

作者： Dong Wei guo-Qiang Lin State Key Laboratory of Systems Medicine for cancer Shanghai Cancer InstituteShanghai Key Laboratory of Systems Regulation and Clinical Translation for CancerRen Ji HospitalShanghai Jiao Tong University School of MedicineShanghai200127 China State Key Laboratory of chemical Biology Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of SciencesShanghai200032 China

As the chemical industry grapples with the need for more eco-friendly practices,the use of water as a reaction medium is gaining attraction in organic *** mini-review delves into Pd-catalyzed reactions that utilize the "on-water" mechanism,spanning from 2019 to late *** reactions are neatly categorized into several types: (A) catalytic c—H activations,(B) Mizoroki- Heck-type reactions,(c) Suzuki-Miyaura reactions,and (D) cyclization *** showcasing the potential of water as a sustainable reaction medium for organic transformations,these reactions leave no doubt about the importance of embracing eco-friendly practices in the chemical *** Scientists In 1980,a seminal work by Breslow et *** an acceleration of reaction rate in the Diels-Alder *** and co-workers noted a significant increase in the rate of the [2σ+2σ+2π] cycloaddition of quadricyclane and dimethyl azodicarboxylate (DMAD) when the reaction was conducted in water,as opposed to when it was carried out in organic *** term "on-water" was then coined to describe this *** strategy was further expanded to transition-metal catalyzed transformations by Ackermann in ***,Varma and Leazer disclosed a Pd-catalyzed Mizoroki-Heck type arylation of alkenes with diaryliodonium salts “on-water”.The enantioselective version of "on-water" process was not realized until 2014 by the Zhou *** on,the Schaub group described a Pd-catalyzed Suzuki–Miyaura coupling reaction of electron-poor aryl chlorides with water,using only 50 ppm of catalyst *** recently,Liu and Lin extended the "on-water" strategy to Pd-catalyzed double Mizoroki-Heck *** mini-review has focused on Pd-catalyzed reactions involving the “on-water” mechanism.

关键词： Pd-catalyzed “On-water” Green chemistry Aqueous reactions Mechanism Methodology and reactions Mizoroki-Heck reaction cross-coupling

A hierarchical byzantine fault tolerance consensus protocol for the Internet of Things

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High-confidence computing 2024年第3期4卷 13-24页

作者： Rongxin guo Zhenping guo Zerui Lin Wenxian Jiang college of Engineering Huaqiao UniversityQuanzhou 362000China college of computer Science and Technology Huaqiao UniversityXiamen 361021China

The inefficiency of consensus protocols is a significant impediment to blockchain and IoT convergence *** solve the problems like inefficiency and poor dynamics of the Practical Byzantine Fault Tolerance(PBFT)in IoT scenarios,a hierarchical consensus protocol called DcBFT is *** all,we propose an improved k-sums algorithm to build a two-level consensus cluster,achieving an hierarchical management for IoT ***,A scalable two-level consensus protocol is proposed,which uses a multi-primary node mechanism to solve the single-point-of-failure *** addition,a data synchronization process is introduced to ensure the consistency of block data after view ***,A dynamic reputation evaluation model is introduced to update the nodes’reputation values and complete the rotation of consensus nodes at the end of each consensus *** experimental results show that DcBFT has a more robust dynamic and higher consensus ***,After running for some time,the performance of DcBFT shows some improvement.

关键词： IoT Hierarchical consensus clustering Reputation evaluation model Practical byzantine fault tolerance

Body size induced changes in metabolic carbon of soil nematodes under N deposition and precipitation regime change in a temperate grassland

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Ecological Processes 2024年第1期13卷 120-131页

作者： Shuyan cui Xiaomei Mo guo Zheng college of Life Science Shenyang Normal University

Background Global climate change has resulted in precipitation regimes exhibiting an increasing trend in rainfall intensity but a reduction in its frequency. Nitrogen(N) deposition is a crucial component of the global N cycling. Nematode body size is a trait that responds to climate change and is used as a standard trait-based indicator in soil community analysis. Variations in body size influence metabolic carbon(c). We examined the ways by which body size and metabolic c of nematodes respond to changing precipitation regimes and how N deposition regulates these responses by an 8-year manipulative *** Nematode body size was indicated by the community-weighted mean(cWM) mass. We quantified c metabolism components of soil nematodes including production c, respiration c, and corresponding c use efficiency(cUE) under different precipitation intensities and N addition in a semi-arid steppe on the Mongolian Plateau. The Mantel test was used to determine the correlations between cWM, cUE and environmental factors. The partial least squares path modeling(PLS-PM) was conducted to quantify direct or indirect contributions among latent *** We found that heavy precipitation intensity increased the cWM mass of total nematodes and omnivorespredators without N addition. N addition decreased cWM mass of bacterivores across all the precipitation intensity treatments. Stronger precipitation intensities might be favorable for nematode production and respiration c. Variations in the nematode cWM mass drove the cUE to change with N *** Our findings provide new insights into the mechanisms underlying nematode body size and c metabolism, and highlight that explorative studies, such as manipulative experiments, are needed to identify traits underlying size-related effects and to investigate how they affect cUE of nematodes. These efforts may increase our understanding of how changes in precipitation regimes and N deposition may alter soil nema

关键词： community-weighted mean Metabolic footprint Nitrogen addition Precipitation intensity

Mechanical Behavior Based on Aggregates Microstructure of Ultra-high Performance concrete

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Journal of Wuhan University of Technology(Materials Science) 2024年第3期39卷 673-681页

作者：丁庆军 ZHOU changsheng 张高展 guo Hong LI Yang ZHANG Yongyuan guo Kaizheng School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Advanced Building Materials Key Laboratory of Anhui Province School of Material Science and Chemical EngineeringAnhui Jianzhu UniversityHefei 230601China china Railway 17th Bureau Group co. Ltd.Taiyuan 030006China

We developed ultra-high performance concrete(UHPc)incorporating mullite sand and brown corundum sand(BcS),and the quartz sand UHPc was utilized to prepare for *** properties of compressive strength,elastic modulus,ultrasonic pulse velocity,flexural strength,and toughness were *** electron microscopy and nanoindentation were also conducted to reveal the underlying mechanisms affecting macroscopic *** to the superior interface bonding properties between mullite sand and matrix,the compressive strength and flexural toughness of UHPc have been significantly *** sand and BcS aggregates have higher stiffness than quartz sand,contributing to the excellent elastic modulus exhibited by *** stiffness and volume of aggregates have a more significant impact on the elastic modulus of UHPc than interface performance,and the latter contributes more to the strength of *** study will provide a reference for developing UHPc with superior elastic modulus for structural engineering.

关键词： ultra-high performance concrete mechanical properties fine aggregates microstructure nanoindentation