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Journal of Thermal Science 2022年第5期31卷 1642-1662页

作者： YANG Siheng hui Xin ZHANG Chi QIAN Weijia gan Xiaohua National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics School of Energy and Power EngineeringBeihang UniversityBeijing102206China Department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhen518000China

The present work investigates the effects of outer stage flare angle on ignition and kernel propagation in a centrally staged optical model combustor based on the kernel dynamics analysis and laser diagnostics of flow and spray *** outer stage flare angles of 8°,16°,and 25°are researched,*** better ignition performances are found for larger outer stage flare *** properties such as the kernel velocity,kernel trajectory extracted from 6 k Hz high-speed flame images are analyzed in combination with the flow and spray measured via Particle Image Velocimetry(PIV)and Planar Mie Scattering(PMie).Results show that the larger outer stage flare angle imposes a larger opening angle of outer swirl jet(SWJ),shifting the vortex in outer recirculation zone(ORZ)and inner recirculation zone(IRZ)*** spray distribution of a smaller flare angle exhibits a fuel-lean zone near the igniter and this is attributed to the presence of low-angle outer swirl jet that prevents the fuel droplets from arriving at the igniter *** flame kernel propagates along the path where the strain rate and velocity decrease and the spray droplet density is within the flammable limits.A lower outer stage flare angle increases the strain rate and velocity at the early phase of flame propagation,leading to a longer propagation route and thus increasing the risk of ignition failure.

关键词： spray ignition flame propagation spray distribution separated dual-swirl

Improvement of stability of trivalent chromium electroplating of Ti based IrO_2+Ta_2O_5 coating anodes

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Rare Metals 2006年第Z1期25卷 645-649页

作者： li Baosong liN An gan Fuxing Department of Environmental Engineering School of Resource and Environmental Science Wuhan University Wuhan 430079 China Department of Environmental Engineering School of Resource and Environmental Science Wuhan University Wuhan 430079 China Department of Environmental Engineering School of Resource and Environmental Science Wuhan University Wuhan 430079 China

The preparation process and properties of the thermally prepared Ti anodes coated with IrO2+Ta2O5 was studied. The structure and morphologies of the IrO2+Ta2O5 coatings were determined by XRD and SEM. Their electrochemical properties were studied by polarization curve and cyclic voltammetry. Trivalent chromium electroplating using Ti/IrO2+Ta2O5 anodes is carried out and the results were analyzed. Results show that this anode exhibits excellent electrochemical activity and stability in sulfate electrolysis. The electrocatalytic activity is determined not only by the content of IrO2 but also the structure and morphology of the anode coatings. The electroplating results indicats that Ti/IrO2+Ta2O5 anodes have excellent capabilities and merits in improving the stability of trivalent chromium electroplating in sulfate system.

关键词： IrO2+Ta2O5 trivalent chromium electroplating oxygen evolution oxide coated anode

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层理影响下油页岩力学性质与破坏断裂特征

煤炭技术 2025年第1期44卷 57-62页

作者：甘泽李富平杨曦甘德清华北理工大学矿业工程学院河北唐山063210 河北省矿业开发与安全技术实验室河北唐山063210

为明确层理角度对油页岩力学性质与破坏断裂特征的影响,选取0°、60°和90°层理角度油页岩试样,对其开展单轴压缩实验、场应变与声发射监测。研究发现:水平层理会使油页岩的压密阶段更为显著。垂直层理、60°层理和水平层理油页岩的破... 详细信息

为明确层理角度对油页岩力学性质与破坏断裂特征的影响,选取0°、60°和90°层理角度油页岩试样,对其开展单轴压缩实验、场应变与声发射监测。研究发现:水平层理会使油页岩的压密阶段更为显著。垂直层理、60°层理和水平层理油页岩的破坏模式分别为劈裂型的剪切-张拉破坏、剪切破坏和穿层劈裂破坏。垂直层理油页岩容易形成多条平行应变集中条带;60°层理角度油页岩更容易在截切面形成主要应变集中条带;水平层理油页岩应变集中条带主要沿着水平层理分布,并在水平应变集中条带之间形成纵向的穿层应变集中条带。垂直层理试样的振铃计数表现为阶梯上升,水平层理与60°层理试样表现为振铃计数在破坏阶段的陡然增加。

关键词：油页岩层理应力应变曲线破坏模式主应变场声发射

Thickness dependence of superconductivity in layered GeP_(5)

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Rare Metals 2024年第3期43卷 1323-1328页

作者： lin Wu Ke-Meng Yang Wei gan Rui-Chun Xiao Ya-Jie Dai Xi Tang Hong lin hui Han hui li Information Materials and Intelligent Sensing Laboratory of Anhui Province Institute of Physical Science and Information TechnologyAnhui UniversityHefei230601China

Understanding the relationship between dimensionality and superconductivity has attracted substantial research *** this work,we report the effective modulation of superconductivity in GeP_(5)through *** superconducting phase transition temperature improves by~10%as the thickness of GeP_(5)decreases from bulk to~96 nm,behaving as a unique negative relationship between the superconducting phase transition temperatureand thickness.

关键词： superconductivity dimensionality

Differences in the Rainfall Characteristics between Mount Tai and Its Surrounding Areas

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Journal of Meteorological Research 2019年第5期33卷 976-988页

作者： Yuting gan Nina li Jian li Chinese Academy of Meteorological Sciences China Meteorological Administration

As a typical small-scale, isolated topography, Mount Tai exhibits great differences in precipitation characteristics from the surrounding areas. It was found that the amount of rainfall occurring over Mount Tai is significantly larger than what is observed in the surrounding areas. Based on hourly rain gauge records for the warm season(May to September) of 1996–2015, differences between Mount Tai and its surrounding areas were further revealed in terms of rainfall diurnal variation, spatial scale, and evolution process. The diurnal variation of the enhancement on rainfall amount exhibit "dual peaks" occurring in the early morning and afternoon, and the dual peaks are mainly attributable to rainfall frequency. The diurnal phase of the rainfall amount in the surrounding areas lags 1 h behind that over Mount Tai. Regarding differences in rainfall spatial scale, compared to those of surrounding areas, precipitation over Mount Tai is characterized by a smaller coverage, especially in the early morning. Mount Tai also tends to have a kind of unique, small-scale rainfall in the afternoon and at night. Based on statistical analysis of precipitation events,differences in rainfall evolution process were identified as well. Rainfall over Mount Tai often starts earlier in the afternoon and ends later at night than it does in the surrounding areas. Furthermore, nocturnal rainfall events over Mount Tai are prone to peaking over a shorter period and enduring for a longer period after reaching their maximum intensity, compared with nocturnal rainfall events occurring in the surrounding areas. Rainfall events over Mount Tai always last longer, especially those occurring in the early morning. In general, Mount Tai has a large enhancement effect on rainfall.

关键词： rainfall differences diurnal variation rainfall evolution process isolated topography Mount Tai

Review of gan-Based Research on Chinese Character Font Generation

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Chinese Journal of Electronics 2024年第3期33卷 584-600页

作者： Xuanhong WANG Cong li Zengguo SUN Luying hui Xi'an University of Posts and Telecommunications School of Computer Science Shaanxi Normal University Key Laboratory of Intelligent Computing and Service Technology for Folk Song Ministry of Culture and Tourism

With the rapid development of deep learning,generative adversarial network(gan) has become a research hotspot in the field of computer *** has a wide range of applications in image *** by gan,a series of models of Chinese character font generation have been proposed in recent *** this paper,the latest research progress of Chinese character font generation is analyzed and *** and its development history are ***-based methods for Chinese character font generation are clarified as well as their improvements,based on whether the specific elements of Chinese characters are *** public datasets used for font generation are summarized in detail,and various application scenarios of font generation are *** evaluation metrics of font generation are systematically summarized from both qualitative and quantitative *** paper contributes to the in-depth research on Chinese character font generation and has a positive effect on the inheritance and development of Chinese culture with Chinese characters as its carrier.

关键词： Generative adversarial network Font generation Image-to-image translation Deep learning

Effect of nitrobenzene on the performance and bacterial community in an expanded granular sludge bed reactor treating high-sulfate organic wastewater

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Frontiers of Environmental Science & Engineering 2019年第1期13卷 63-72页

作者： Jun li Wentao li gan Luo Yan li Aimin li State Key Laboratory of Pollution Control and Resources Reuse School of the Environment Nanjing University Nanjing 210023 China Nanjing University & Yancheng Academy of Environmental Protection Technology and Engineering Yancheng 224000 China

Nitrobenzene (NB) is frequently found in wastewaters containing sulfate and may affect biological sulfate reduction process, but information is limited on the responses of sulfate reduction efficiency and microbial community to the increased NB contents. In this study, a laboratory-scale expanded granular sludge bed reactor was operated continuously to treat high-sulfate organic wastewater with increased NB contents. Results successfully demonstrated that the presence of more than 50 mg/L NB depressed sulfate reduction and such inhibition was partly reversible. Bath experiments showed that the maximum specific desulfuration activity (SDA) decreased from 135.80 mg SO4^2-/gVSS/d to 30.78 mg SO4^2-/gVSS/d when the NB contents increased from none to 400 mg/L. High-throughput sequencing showed that NB also greatly affected bacterial community structure. Bcicteroidetes dominated in the bioreactor. The abundance of Proteobacteria increased with NB addition while Firmicutes presented an opposite trend. Proteobacteria gradually replaced Finnicutes for the dominance in response to the increase of influent NB *** genus Desulfovibrio was the dominant sulfate-reducing bacteria (SRB) with absence or presence of NB, but was inhibited under high content of NB. The results provided better understanding for the biological sulfate reduction under NB stress.

关键词： Nitrobenzene (NB) Sulfate-reducing bacteria (SRB) Bacterial community Sulfate reduction High-throughput sequencing

Two-dimensional iron-porphyrin sheet as a promising catalyst for oxygen reduction reaction: a computational study

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Science Bulletin 2017年第19期62卷 1337-1343页

作者： gan Luo Yu Wang Yafei li Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials Jiangsu Key Laboratory of New Power BatteriesSchool of Chemistry and Materials ScienceNanjing Normal University

The development of non-platinum(Pt) oxygen reduction reaction(ORR) catalysts with high activity and low cost is of great importance for large-scale commercialization of fuel cells. By means of density functional theory(DFT) computations, we theoretically identified that two-dimensional(2D) iron-porphyrin(Fe-Pp) sheet, in which the active Fe sites are distributed regularly and separately, is an appealing candidate. The pristine Fe-Pp sheet exhibits considerably high catalytic activity and four-electron selectivity for ORR. Especially, the adsorption of ORR intermediates on Fe-Pp sheet can be significantly weakened by the addition of axial cyanogen(CN) ligand, resulting in pronouncedly enhanced ORR activity. More interestingly, the d band center of CN attached Fe-Pp(Fe-Pp-CN) sheet can be further tuned by applying the external tensile or compressive strain, leading to an enhancement or suppression of ORR catalytic performance. In particular, under a small biaxial tensile strain of 2%, the ORR activity of Fe-Pp-CN sheet is even higher than that of Pt and reaches to the top of activity volcano. Our studies open new ways to design effective non-Pt ORR catalysts for fuel cell technology.

关键词： ElectrocatalystORR2D matedals DFT computations

LyαEmission Enhancement Associated with Soft X-Ray Microflares

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Research in Astronomy and Astrophysics 2023年第6期23卷 116-133页

作者： Zheng-Yuan Tian li Feng Lei Lu Fan-Xiaoyu Xia Yang Su Wei-Qun gan hui li Yue Zhou Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China

Lyα(Lyα,1216 A)is the strongest emission line in the solar ultraviolet *** the present work,we obtained a Lyαenhancement catalog covering flares larger than B1 class from the GOES/EUVS data during *** focused on the 242 B-class events which are less investigated,however,show non-negligible Lyαemission *** found that on average the Lyαpeak of B-class flares is 0.85%stronger than the *** the flare energetics,it is found that the weaker the soft X-ray(SXR)flare,the larger the ratio of the radiated energy in Lyαto *** the RHESSI data and multi-wavelength observations taken by SDO-AIA,we diagnose the thermal and non-thermal properties of several *** case studies show that the coincidence of the Lyαpeak with the SXR time-derivative peak is not a sufficient condition of the nonthermal property of a Lyα*** Lyαenhancement in the microflares may be caused by the nonthermal electron beams or/and thermal *** for typeⅢevents,we found that the delay of the Lyαpeak with respect to the SXR peak can be attributed to either the Lyαemission from a filament erupted or the cooling of the thermal plasma in flare ***,interestingly the Lyαemission from filaments can not only occur in the decay phase of the flare,but also in the preflare *** this case,the Lyαemission was originated from an erupted filament which probably initiated the flare.

关键词： Sun:flares Sun:chromosphere Sun:UV radiation Sun:filaments prominences

Sharp Threshold of Global Existence for the Klein-Gordon Equations with Critical Nonlinearity

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Acta Mathematicae Applicatae Sinica 2009年第2期25卷 273-282页

作者： Zai-hui gan Bo-ling Guo Jian Zhang College of Mathematics and Software Science Sichuan Normal University Chengdu 610068 China Institute of Applied Physics and Computational Mathematics PO Box 8009 Beijing 100088 China

In this paper, we present a cross-constrained variational method to study the Cauchy problem of the nonlinear Klein-Gordon equations with critical nonlinearity in two space dimensions. By constructing a type of cross-constrained variational problem and establishing so-called cross-invariant manifolds of the evolution flow, we establish a sharp threshold of global existence and blowup of it. Furthermore, we answer the question： How small are the initial data if the solution exists globally.

关键词： Sharp threshold Klein-Gordon equation cross-constrained variational problem global existence blowup