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DEVELOPMENT OF CALCULATING MODEL APPLICABLE FOR CYLINDER WALL DYNAMIC HEAT TRANSFER

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Chinese Journal of Mechanical Engineering 2007年第1期20卷 60-63页

作者： ZHONG minjun SHI Tielin School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430064. China

In the calculation of submarine air conditioning load of the early stage, the obtained heat is regarded as cooling load. The confusion of the two words causing the cooling load figured out is abnormally high, and the change of air conditioning cooling load can not be indicated. In accordance with submarine structure and heat transfer characteristics of its inner components, Laplace transformation to heat conduction differential equation of cylinder wall is carried out. The dynamic calculation of submarine conditioning load based on this model is also conducted, and the results of calculation are compared with those of static cooling load calculation. It is concluded that the dynamic cooling load calculation methods can illustrate the change of submarine air conditioning cooling load more accurate than the static one.

关键词： Cylinder wall Air conditioning Load calculation

Particulate matter(PM(2.5)) exposure season-dependently induces neuronal apoptosis and synaptic injuries

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Journal of Environmental Sciences 2017年第4期29卷 336-345页

作者： minjun Chen Ben Li Nan Sang College of Environment and Resource Research Center of Environment and HealthShanxi University

Epidemiological studies have shown that particulate matter 2.5（PM（2.5）） not only increases the incidence of cardiopulmonary illnesses but also relates to the development of neurodegenerative diseases. Considering that PM（2.5）is highly heterogeneous with regional disparity and seasonal variation, we investigated whether PM（2.5）exposure induced neuronal apoptosis and synaptic injuries in a season-dependent manner. The results indicated that PM（2.5）altered the expression of apoptosis-related proteins（mainly bax and bcl-2）, activated caspase-3 and caused neuronal apoptosis. Additionally, PM（2.5）decreased the levels of synaptic structural protein postsynaptic density（PSD-95） and synaptic functional protein N-methyl-D-aspartate（NMDA） receptor subunit（NR2B） expression. These effects occurred in a season-dependent manner, and PM（2.5）collected from the winter showed the strongest changes. Furthermore, the effect was coupled with the inhibition of phosphorylated extracellular signal-regulated kinase 1/2（p-ERK1/2） and phosphorylated c AMP-response element binding protein（p-CREB）. Based on the findings, we analyzed the correlations between the chemical composition of PM（2.5）samples and the biological effects, and confirmed that winter PM（2.5）played a major role in causing neuronal apoptosis and synaptic injuries among different season samples.

关键词： Particulate matter(PM(2.5)) Season-dependent effect Neuronal apoptosis Synaptic injury

A Frame Breaking Based Hybrid Algorithm for UHF RFIDAnti-Collision

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Computers, Materials & Continua 2019年第6期59卷 873-883页

作者： Xinyan Wang minjun Zhang Zengwang Lu Intelligent Science and Information Engineering College Xi’an Peihua UniversityXi’an710125China School of Information Science and Technology Northwest UniversityXi’an710127China Huawei Technologies Dusseldorf GmbH Düsseldorf 40549Germany

Multi-tag collision imposes a vital detrimental effect on reading performanceof an RFID system. In order to ameliorate such collision problem and to improve thereading performance, this paper proposes an efficient tag identification algorithm termedas the Enhanced Adaptive Tree Slotted Aloha (EATSA). The key novelty of EATSA is toidentify the tags using grouping strategy. Specifically, the whole tag set is divided intogroups by a frame of size F. In cases multiple tags fall into a group, the tags of the groupare recognized by the improved binary splitting (IBS) method whereas the rest tags arewaiting in the pipeline. In addition, an early observation mechanism is introduced toupdate the frame size to an optimum value fitting the number of tags. Theoretical analysisand simulation results show that the system throughput of our proposed algorithm canreach as much as 0.46, outperforming the prior Aloha-based protocols.

关键词： RFID anti-collision aloha binary splitting

Covalent flavoproteins:types,occurrence,biogenesis and catalytic mechanisms

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维普期刊数据库

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Chinese Journal of Natural Medicines 2022年第10期20卷 749-760页

作者： WANG minjun ZHANG Wenyuan WANG Nan Ocean College Zhejiang UniversityZhoushan 316021China

Flavoproteins are proteins that contain a nucleic acid derivative of riboflavin:flavin adenine dinucleotide(FAD)or flavin mononucleotide(FMN).Flavoproteins are involved in a wide array of biological processes,such as photosynthesis,DNA repair and natural product *** should be noted that 5%-10%of flavoproteins have a covalently linked flavin prosthetic *** covalent linkages benefit the holoenzyme in several ways including improving the stability and catalytic *** the past decade,significant progress has been made in covalent flavoproteins,especially with respect to enzyme-dependent biogenesis and discovery of novel linkage *** present review gives a condensed overview of investigations published from March 2009 to December 2021,with emphasis on the discovery,biogenesis and their catalytic role in natural product biosynthesis.

关键词： Flavoprotein Covalent linkage Biosynthesis Natural products

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围岩大变形控制的让压锚杆支护研究进展

煤炭技术 2025年第1期44卷 22-26页

作者：唐民军王凤云安徽建筑大学智能地下探测安徽省重点实验室合肥230601 安徽建筑大学安徽省智能地下探测技术研究院合肥230601 安徽建筑大学土木工程学院合肥230601

让压锚杆支护是一种能有效控制围岩大变形的方法,允许受控的岩石变形,以降低围岩的压力,从而避免衬砌应力过大。对现阶段让压型锚杆支护研究进展进行了概括性的总结,研究成果展现了不同类型的让压锚杆,揭示了普通锚杆延伸率不足、承载... 详细信息

让压锚杆支护是一种能有效控制围岩大变形的方法,允许受控的岩石变形,以降低围岩的压力,从而避免衬砌应力过大。对现阶段让压型锚杆支护研究进展进行了概括性的总结,研究成果展现了不同类型的让压锚杆,揭示了普通锚杆延伸率不足、承载性能较低的问题;阐明了让压锚杆的让压机理,体现了让压锚杆控制围岩大变形的优越性。

关键词：让压锚杆让压锚杆类型让压机理

100 W-class green hydrogen production from ammonia at a dual-layer electrode containing a Pt-Ir catalyst for an alkaline electrolytic process

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Journal of Energy Chemistry 2024年第6期93卷 352-360,I0009页

作者： Donghyun Yoon Sunki Chung minjun Choi Eunhyeok Yang Jaeyoung Lee School of Earth Sciences and Environmental Engineering Gwangju Institute of Science and Technology(GIST)Gwangju 61005Republic of Korea International Future Research Center of Chemical Energy Storage and Conversion Processes GISTGwangju 61005Republic of Korea Ertl Center for Electrochemistry and Catalysis GISTGwangju 61005Republic of Korea TKG Huchems Co.Ltd 963Sangam-roYeosu-siJeollanam-do 59614Republic of Korea

Ammonia allows storage and transport of hydrogen over long distances and is an attractive potential hydrogen *** decomposition has recently been used for the conversion of ammonia to hydrogen and is regarded as a future technology for production of CO_(2)-free pure ***,a heterostructural Pt-Ir dual-layer electrode is developed and shown to achieve successful long-term operation in an ammonia electrolyzer with an anion exchange membrane(AEM).This electrolyzer consisted of eight membra ne electrode assemblies(MEAs)with a total geometric area of 200 cm~2 on the anode side,which resulted in a hydrogen production rate of 25 L h~(-1).We observed the degradation in MEA performance attributed to changes in the anode catalyst layer during hydrogen production via ammonia ***,we demonstrated the relationship between the ammonia oxidation reaction(AOR)and the oxygen evolution reaction(OER).

关键词： Ammonia oxidation Dual-layer catalyst Green hydrogen Electrolytic process Oxygen evolution reaction

Non-destructive Measurement of Magnetic Properties of Claw Pole

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Chinese Journal of Mechanical Engineering 2019年第5期32卷 23-33页

作者： Chengliang Hu Xuejiao Bai minjun Tang Xiaofeng Tang Zhen Zhao Institute of Forming Technology&Equipment School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200030China Jiangsu Longcheng Precision Forging Co. Ltd.Jiangsu 213100China

The magnetic properties of the claw pole have a direct effect on the output power of a generator Many methods can be used to measure these magnetic properties,each with its own advantages,but an important shortcoming is that all are *** this study,a new non-destructive method to measure the magnetic properties of claw pole was proposed and a corresponding testing set-up was designed.A finite-element model was constructed to simulate the measurement *** proved that the measured magnetization-like curves had good agreement with the trend of the input magnetic curves and the effect of the positioning error in the measuring process could be *** further validate the new method,seven types of claw poles of different materials subjected to different heat-treatment processes were forged and tested by both the new method and the conventional ring-sample *** with the latter,the new method showed better consistency,relatively higher accuracy,and much stronger stability of measurement results;however,its sensitivity needs to be *** effects of material compositions and heat-treatment parameters on the magnetic properties of the claw pole were briefly analyzed.

关键词： Claw pole Magnetic property Measurement Ring sample Accuracy Stability

Impacts of Total Energy Consumption Control and Energy Quota Allocation on China′s Regional Economy Based on A 30-region Computable General Equilibrium Analysis

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Chinese Geographical Science 2015年第6期25卷 657-671页

作者： LI Na SHI minjun SHANG Zhiyuan YUAN Yongna University of Chinese Academy of Sciences Research Center on Fictitious Economy & Data Science Chinese Academy of Sciences

This paper examined the impacts of the total energy consumption control policy and energy quota allocation plans on China′s regional economy. This research analyzed the influences of different energy quota allocation plans with various weights of equity and efficiency, using a dynamic computable general equilibrium(CGE) model for 30 province-level administrative regions. The results show that the efficiency-first allocation plan costs the least but widens regional income gap, whereas the outcomes of equity-first allocation plan and intensity target-based allocation plan are similar and are both opposite to the efficiency-first allocation plan′ outcome. The plan featuring a balance between efficiency and equity is more feasible, which can bring regional economic losses evenly and prevent massive interregional migration of energy-related industries. Furthermore, the effects of possible induced energy technology improvements in different energy quota allocation plans were studied. Induced energy technology improvements can add more feasibility to all allocation plans under the total energy consumption control policy. In the long term, if the policy of the total energy consumption control continues and more market-based tools are implemented to allocate energy quotas, the positive consequences of induced energy technology improvements will become much more obvious.

关键词： total energy consumption control energy quota allocation computable general equilibrium (CGE) model induced energytechnology improvements

Substrate mediated dissolution of redox active nanoparticles;electron transfer over long distances

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Nano Research 2022年第1期15卷 429-437页

作者： Ruo-Chen Xie Christopher Batchelor-McAuley minjun Yang Richard G.Compton Department of Chemistry Physical and Theoretical Chemistry LaboratoryUniversity of OxfordSouth Parks RoadOxford OXl 3QZUK

Reflective dark field microscopy is used to observe the decrease in the light scattered from Ag nanoparticles immobilised on differing solid *** nanoparticles are exposed to solutions containing halide ions,both at open circuit and under potentiostatic control,leading to the loss of the *** coupling optical and electrochemical techniques the physical origin of this transformation is demonstrated to be the electrochemical dissolution of the metal nanoparticles driven by electron transfer to ultra-trace dissolved *** dissolution kinetics of the surface-supported metal nanoparticles is compared on four substrate materials(i.e.,glass,indium titanium oxide,glassy carbon and platinum)with different electrical *** three conductive substrates catalyse the redox-driven dissolution of Ag nanoparticles with the electrons transferred from the nanoparticles,via the macroscopic electrode to the dioxygen electron acceptor.

关键词： substrate electrocatalysis oxidative dissolution metal nanoparticles optical microscopy electrochemistry