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Conduction-convection coupled heat transfer around a hollow cylinder under different buoyancy forces

Chinese Journal of Aeronautics 2024年第4期37卷 216-228页

作者： wanyu zhang Jingyi WU Guang YANG Institute of Refrigeration and Cryogenics Shanghai Jiao Tong UniversityShanghai 200240China

In order to clarify the effect of a buoyancy force on conduction–convection coupled heat transfer in a hollow cylinder, the flow and thermal characteristics were analyzed using an RNG k-ε turbulence model. The Reynolds number was fixed at 1.014 × 10^(6), and the Rayleigh number varied from 1.122 × 10^(10)to 1.088 × 10^(11). Results have shown that, when considering the effect of an opposed buoyancy force, increasing the Rayleigh number has a positive impact on the rate of change and uniformity of the cylinder temperature. The temperature distributions along the axial and circumferential directions are similar for different Rayleigh numbers, but extreme values differ.Along the axial direction, the maximum temperature is obtained at the interface between the variable-diameter part and the constant-diameter part. The maximum dimensionless temperature value decreases to 0.12 when the Rayleigh number increases to 1.088 × 10^(11). Along the circumferential direction, the temperature distribution is affected by the buoyancy force, which results in the temperature of the upper part being higher than that of the lower part. After nondimensionalization of the temperature and time, a correlation was proposed to illustrate the transient heat transfer process quantitatively. The standard deviation of the maximum relative temperature, representing the temperature uniformity, was also calculated. It was found that the difference in the direction of the buoyancy force made a huge difference. Compared with the opposed buoyancy force, the maximum dimensionless temperature is almost two times higher with an assisted buoyancy force. Similarly, the heat transfer coefficient with an assisted buoyancy force is half of that with an opposed buoyancy force. Overall, an assisted buoyancy force plays a negative role in terms of thermal characteristics. The flow field around the hollow cylinder was also illustrated to reveal the mechanism of the buoyancy force on magnitude and direction aspects.

关键词： Buoyancy Conduction-convection heat transfer Transient analysis Hollow cylinder Non-dimensionalization

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A patient with glycogen storage disease type IA combined with hepatic adenoma: A case report

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Genes & Diseases 2023年第3期10卷 701-704页

作者： Maohui Yin Lei Chang Ping Jiang Zhiyong Yang Zhonglin zhang wanyu zhang Zhisu Liu Department of Hepatobiliary and Pancreatic Surgery Zhongnan Hospital of Wuhan UniversityWuhanHubei 430062China Department of Pathology Zhongnan Hospital of Wuhan UniversityWuhanHubei 430071China

Glycogen storage disease(GSD)is a rare autosomal recessive disease by abnormal accumulation of intracellular glycogen.1 Mutations in genes encoding G-6-P or G-6-Pase lead to dysfunction of the body's glycogen metabolism.Without adequate metabolic treatment,patients with GSD can die during infancy or childhood from severe hypoglycemia and acidosis.The patient's symptoms generally achieve remission during adolescence,except in rare cases when cirrhosis of the liver or myopathy occurs.Once GSD is identified in adults,the patients are often accompanied by many complications,such as fasting hypoglycemia.

关键词： patient adenoma hepatic

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An ion-released MgI_(2)-doped separator inducing a LiI-containing solid electrolyte interphase for dendrite-free Li metal anodes

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Journal of Energy Chemistry 2022年第12期75卷 83-94,I0003页

作者： Shan Yi Zhe Su wanyu zhang Hongli Chen Yayun zhang Bo Niu Donghui Long State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai 200237China Key Laboratory for Specially Functional Materials and Related Technology of the Ministry of Education East China University of Science and TechnologyShanghai 200237China

Lithium metal batteries are among the strong contenders to satisfy the ever-increasing needs of energy storage systems,which however suffer from poor composition of the solid electrolyte interphase(SEI)layer and uncontrolled Li dendrites formation.In this regard,we report on the design of an ionreleased MgI_(2)-doped polyacrylonitrile(PAN)based nanofiber(MPANF)separator,which can lead to conducive SEI layer and dendrite-free Li anode.The combination of the lithophilic MgI_(2)nanoparticles with polarized PAN matrix comprehensively functions as a high-compatible interpenetrating network to homogenize ionic transportation and confront dendrite growth.The released I ions introduce the highion-conductivity LiI into SEI layer,which could induce the formation of favorable and protective interface layer in the early stage,as embodied in the enrichment of advantageous components such as LiN_(x)O_(y),Li_(2)O,LiF,and Li_(3)N.Profited from the high-affinity MPANF separator,the Li||Li symmetric cell achieves an ultralow voltage hysteresis of 46 mV with an extended lifespan of 580 h.And a prolonged lifetime of 590cycles with an enhanced specific capacity of 140.1 m Ah g^(-1)and the Coulombic efficiency of 96.2%at 1C can be obtained in full cells.This work may offer a facile and high-affinity alternative to traditional polymeric separators for high-performance and dendrite-free Li metal batteries.

关键词： Lithium metal anode LiI-containing layer Dendrite-free anode Electrospun nanofiber separator

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Privacy-Preserving Deep Learning on Big Data in Cloud

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China Communications 2023年第11期20卷 176-186页

作者： Yongkai Fan wanyu zhang Jianrong Bai Xia Lei Kuanching Li State Key Laboratory of Media Convergence and Communication Communication University of ChinaBeijing 100024China Industrial and Commercial Bank of China Zhuhai Branch Zhuhai 519000China Dept.of Computer Science and Information Engineering Providence UniversityTaichung 43301China

In the analysis of big data,deep learn-ing is a crucial technique.Big data analysis tasks are typically carried out on the cloud since it offers strong computer capabilities and storage areas.Nev-ertheless,there is a contradiction between the open nature of the cloud and the demand that data own-ers maintain their privacy.To use cloud resources for privacy-preserving data training,a viable method must be found.A privacy-preserving deep learning model(PPDLM)is suggested in this research to ad-dress this preserving issue.To preserve data privacy,we first encrypted the data using homomorphic en-cryption(HE)approach.Moreover,the deep learn-ing algorithm’s activation function—the sigmoid func-tion—uses the least-squares method to process non-addition and non-multiplication operations that are not allowed by homomorphic.Finally,experimental re-sults show that PPDLM has a significant effect on the protection of data privacy information.Compared with Non-Privacy Preserving Deep Learning Model(NPPDLM),PPDLM has higher computational effi-ciency.

关键词： big data cloud computing deep learning homomorphic encryption privacy-preserving

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Ultrafine Vacancy-Rich Nb_(2)O_(5)Semiconductors Confined in Carbon Nanosheets Boost Dielectric Polarization for High-Attenuation Microwave Absorption

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Nano-Micro Letters 2023年第10期15卷 478-493页

作者： Zhe Su Shan Yi wanyu zhang Xiaxi Xu Yayun zhang Shenghu Zhou Bo Niu Donghui Long Shanghai Key Laboratory of Multiphase Materials Chemical Engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237People’s Republic of China Key Laboratory for Specially Functional Materials and Related Technology of the Ministry of Education East China University of Science and TechnologyShanghai 200237People’s Republic of China

The integration of nano-semiconductors into electromagnetic wave absorption materials is a highly desirable strategy for intensifying dielectric polarization loss;achieving high-attenuation microwave absorption and realizing in-depth comprehension of dielectric loss mechanisms remain challenges.Herein,ultrafine oxygen vacancy-rich Nb_(2)O_(5)semiconductors are confined in carbon nanosheets(ov-Nb_(2)O_(5)/CNS)to boost dielectric polarization and achieve high attenuation.The polarization relaxation,electromagnetic response,and impedance matching of the ov-Nb_(2)O_(5)/CNS are significantly facilitated by the Nb_(2)O_(5)semiconductors with rich oxygen vacancies,which consequently realizes an extremely high attenuation performance of-80.8 dB(>99.999999%wave absorption)at 2.76 mm.As a dielectric polarization center,abundant Nb_(2)O_(5)–carbon heterointerfaces can intensify interfacial polarization loss to strengthen dielectric polarization,and the presence of oxygen vacancies endows Nb_(2)O_(5)semiconductors with abundant charge separation sites to reinforce electric dipole polarization.Moreover,the three-dimensional reconstruction of the absorber using microcomputer tomography technology provides insight into the intensification of the unique lamellar morphology regarding multiple reflection and scattering dissipation characteristics.Additionally,ov-Nb_(2)O_(5)/CNS demonstrates excellent application potential by curing into a microwave-absorbing,machinable,and heat-dissipating plate.This work provides insight into the dielectric polarization loss mechanisms of nano-semiconductor/carbon composites and inspires the design of high-performance microwave absorption materials.

关键词： Electromagnetic wave absorption Nb_(2)O_(5)semiconductor Dielectric polarization loss Oxygen vacancy Nb_(2)O_(5)-carbon hetero-interface

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Keggin-type polycationic AlO_(4)Al_(12)(OH)_(24)H_(2)O_(12)^(7+)intercalated MoO_(3)composites for methyl orange adsorption

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Chinese Chemical Letters 2022年第5期33卷 2617-2620页

作者： Qian Wang Hongrui Tian Zhong zhang Tianyi Dang wanyu zhang Jie Wang Ying Lu Shuxia Liu Key Laboratory of Polyoxometalate and Reticular Material Chemistry of the Ministry of Education College of ChemistryNortheast Normal UniversityChangchun 130024China Department of Chemistry and Shenzhen Grubbs Institute Southern University of Science and TechnologyShenzhen 518055China

Molybdenum trioxide(MoO_(3))can be employed as an excellent host for intercalation due to its 2D lay-ered structure that connected by van der Waals interactions.Herein,a series of polyoxometalate-based MoO_(3) composites(Al_(13)@MoO_(3))were successfully prepared by interpolating the Keggin-type polycationic AlO_(4)Al_(12)(OH)_(24)H_(2)O_(12)^(7+)(Al_(13))into MoO_(3)gallery.These composites can be applied to rapidly adsorb the anionic dye methyl orange(MO)through strong electrostatic interactions lead to compact and sta-ble gathering in the surrounding of the numerous charged Al_(13).Adsorption behaviors of composites with the different amount of Al_(13) were determined,these results revealed that Al_(13)-3.34%@MoO_(3)exhibited the most remarkable adsorption capacity.More importantly,the composite maintains superior adsorption capacity for five consecutive adsorption/desorption cycles,suggesting that Al_(13)@MoO_(3)can be an efficient and durable adsorbent.

关键词： MoO_(3) Keggin-type polycationic AlO_(4)Al_(12)(OH)_(24)H_(2)O_(12)^(7+) Intercalation Adsorption Methyl orange dye

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Enhancing low-temperature NH_(3)-SCR performance of Fe-Mn/CeO_(2)catalyst by Al_(2)O_(3)modification

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Journal of Rare Earths 2022年第9期40卷 1454-1461,I0005页

作者： Lulu Li Jiawei Ji Wei Tan Wang Song Xin Wang Xiaoqian Wei Kai Guo wanyu zhang Changjin Tang Lin Dong School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210093China Jiangsu Key Laboratory of Vehicle Emissions Control School of EnvironmentCenter of Modern AnalysisNanjing UniversityNanjing 210093China School of Environment Nanjing Normal UniversityNanjing 210093China

In the work,supported catalysts of FeO_(x) and MnO_(x) co-supported on aluminum-modified CeO_(2)was synthesized for low-temperature NH_(3)-selective catalytic reduction(NH_(3)-SCR)of NO.Impressively,the SCR activity of the obtained catalyst is markedly influenced by the adding amount of Al and the appropriate Ce/Al molar ratio is 1/2.The activity tests demonstrate that Fe-Mn/Ce1 Al2 catalyst shows over 90%NO conversion at 75-250℃and exhibits better SO_(2)resistance compared to Fe-Mn/CeO_(2).Fe-Mn/Ce1 Al2 shows the expected physicochemical characters of the ideal catalyst including the larger surface and increased active reaction active sites by controlling the amount of Al doping.Also,the better catalytic activity is well correlated with the present advantaged surface adsorption oxygen species,Mn^(4+)species,Ce^(3+)species and the enhanced reducibility of Fe-Mn/Ce1 Al2,which is superior to the Fe-Mn/CeO_(2)catalyst.More importantly,we further demonstrate that the amount and strength of surface acid sites are improved by Al-doping and more active intermediates(monodentate nitrate)is generated during NH_(3)-SCR reaction.This work provides certain insight into the rational creation of simple and practical denitration catalyst environmental purification.

关键词： Selectivity catalytic reduction NO removal Low-temperature activity Al doping Cerium dioxide Rare earths

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CPAL, as a New Mediator of Cardiomyocyte Metabolic Alterations and Pyroptosis, Regulates Myocardial Infarction Injury in Mice

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Engineering 2023年第1期20卷 49-62页

作者： Jiamin Li Hongru Xue Ning Xu Liling Gong Ming Li Sijia Li Di Huang Qingwei zhang Pengyu Li Qingsui Li Hang Yu Yining Liu Yadong Xue Haixin Chen Jiali Liu wanyu zhang Mingbin Liu Siyu Chang Xianzhi Lang Xingmiao Zhao Weijie Du Benzhi Cai Ning Wang Baofeng Yang State-Province Key Laboratories of Biomedicine-Pharmaceutics of China&Key Laboratory of Cardiovascular Medicine Research(Ministry of Education of the People’s Republic of China) Department of PharmacologyCollege of PharmacyHarbin Medical UniversityHarbin 150081China Institute of Clinical Pharmacy The University Key Laboratory of Drug ResearchHeilongjiang Higher Education InstitutionsDepartment of Pharmacythe Second Affiliated Hospital of Harbin Medical UniversityHarbin 150081China Research Unit of Noninfectious Chronic Diseases in Frigid Zones(2019RU070) Chinese Academy of Medical SciencesHarbin 150081China Northern Translational Medicine Research and Cooperation Center Heilongjiang Academy of Medical SciencesHarbin Medical UniversityHarbin 150081China

Myocardial infarction (MI), the most serious of the ischemic heart diseases, is accompanied by myocardial metabolic disorders and the loss of cardiomyocytes. Increasing evidence has shown that long noncoding RNAs (lncRNAs) are involved in various pathological conditions such as cancer and cardiovascular diseases (CVDs), and are emerging as a novel biomarker for these disorders. This study aims to investigate the regulatory role and mechanisms of lncRNAs in myocardial remodeling in the setting of MI. We find that post-infarcted hearts exhibit a reduction of adenosine triphosphate (ATP) and an alteration of the glucose and lipid metabolism genes cluster of differentiation 36 (CD36), hexokinase 1 (HK1), and clucose transporter 4 (GLUT4), accompanied by cardiomyocyte pyroptosis. We then identify a previously unknown conserved lncRNA, AK009126 (cardiomyocyte pyroptosis-associated lncRNA, CPAL), which is remarkably upregulated in the myocardial border zone of MI mice. Importantly, the adeno-associated virus 9 (AAV9)-mediated silencing of endogenous CPAL by its short hairpin RNA (shRNA) partially abrogates myocardial metabolic alterations and cardiomyocyte pyroptosis during MI in mice. Mechanistically, CPAL is shown to bind directly to nuclear factor kappa B (NFκB) and to act as an activator of NFκB to induce NFκB phosphorylation in cardiomyocytes. We also find that CPAL upregulates caspase-1 expression at the transcriptional level and consequently promotes the release of interleukin (IL)-18 and IL-1β from cardiomyocytes. Collectively, our findings reveal the conserved lncRNA CPAL as a new regulator of cardiac metabolic abnormalities and cardiomyocyte pyroptosis in the setting of MI and suggest CPAL as a new therapeutic target to protect cardiomyocytes against ischemic injury in infarcted hearts.

关键词： Myocar dial infarction Pyroptosis CPAL NFkB Inflammation

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Impact of COVID-19 on Agriculture,Countryside and Farmers and Countermeasures

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Asian Agricultural Research 2021年第6期13卷 25-28页

作者： wanyu zhang School of Economics and Management Yangtze UniversityJingzhou 434023China

COVID-19 outbreak has great impact on agricultural and rural farmers.In order to effectively cope with the impact of COVID-19 epidemic and promote agricultural and rural development,this paper expounds the impact of the epidemic from three aspects of agricultural production,farmers and rural development,and puts forward corresponding countermeasures:building development platform for rural electric business,implementing the development mode of"Internet plus agriculture",strengthening the input and publicity of agricultural insurance to benefit farmers,and increasing support for local employment and entrepreneurship of migrant workers.

关键词： COVID-19 Agriculture Rural areas and farmers Countermeasures

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增强新时代青年做中国人的志气、骨气、底气的基本内涵、现实意义和实践路径

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金华职业技术学院学报 2024年第2期24卷 38-42页

作者：古今张万玉河南理工大学河南焦作454000

党的十八大以来,习近平总书记对青年群体健康成长成才密切关注、满怀希望,多次在不同重要场合号召新时代青年要增强做中国人的志气、骨气、底气。这既是重塑新时代中国青年奋斗精神、传承弘扬中华民族精神气节的现实需要,也是实现中华... 详细信息

党的十八大以来,习近平总书记对青年群体健康成长成才密切关注、满怀希望,多次在不同重要场合号召新时代青年要增强做中国人的志气、骨气、底气。这既是重塑新时代中国青年奋斗精神、传承弘扬中华民族精神气节的现实需要,也是实现中华民族伟大复兴的内在要求。新时代青年肩负民族复兴的历史重任,增强其做中国人的志气、骨气、底气,要以主流意识形态教育引导、文化资源涵养、实践活动锤炼为着力点,不断提升其精神品质和精神面貌。

关键词：新时代青年中国人志气骨气底气

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