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相变蓄冷材料研究进展

新能源科技 2024年第3期5卷 1-14页

作者：仇豆豆翟鑫钰阮春晨彭孝天彭浩南京工业大学机械与动力工程学院江苏南京211816

相变蓄冷材料具有储能密度高、相变温度可控、循环稳定性强的优点,成为目前最有发展前景的储能方式。文章对现有的相变蓄冷材料进行了分类,总结了不同类型材料的优缺点,重点介绍了国内外学者在固-液相变方面的研究进展,罗列了各种材料... 详细信息

相变蓄冷材料具有储能密度高、相变温度可控、循环稳定性强的优点,成为目前最有发展前景的储能方式。文章对现有的相变蓄冷材料进行了分类,总结了不同类型材料的优缺点,重点介绍了国内外学者在固-液相变方面的研究进展,罗列了各种材料的热物性和化学特性,对其在医疗冷链、建筑制冷、生鲜冷冻等具体应用中的研究进行了阐述。在此基础上,针对目前相变蓄冷材料存在的导热率低、腐蚀性强、易泄漏和过冷度大等问题,文章提出相应的解决方案并阐述改善机理,对相变蓄冷材料的未来发展进行了展望。

关键词：蓄冷相变材料分类应用领域优化方案

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Dynamics of a stochastic rabies epidemic model with Markovian switching

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International Journal of Biomathematics 2021年第5期14卷 163-198页

作者： hao peng Xinhong Zhang Daqing Jiang College of Science China University of Petroleum(East China)Qingdao 266580 P.R.China

In this paper,we analyze a stochastic rabies epidemic model which is perturbed by both white noise and telegraph ***,we prove the existence of the unique global positive ***,by constructing an appropriate Lyapunov function,we establish a sufficient condition for the existence of a unique ergodic stationary distribution of the positive solutions to the *** we establish sufficient conditions for the extinction of ***,numerical simulations are introduced to illustrate our theoretical results.

关键词： Stochastic rabies model stationary distribution Markovian chain extinction

Ideal Spin Hydrodynamics from the Wigner Function Approach

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Chinese Physics Letters 2021年第11期38卷 37-43页

作者： hao-hao peng Jun-Jie Zhang Xin-Li Sheng Qun Wang Interdisciplinary Center for Theoretical Study and Department of Modern Physics University of Science and Technology of ChinaHefei 230026China peng Huanwu Center for Fundamental Theory Hefei 230026China Northwest Institute of Nuclear Technology Xi’an 710024China Key Laboratory of Quark and Lepton Physics(MOE) and Institute of Particle Physics Central China Normal UniversityWuhan 430079China

Based on the Wigner function in local equilibrium, we derive hydrodynamical quantities for a system of polarized spin-1/2 particles: the particle number current density, the energy-momentum tensor, the spin tensor, and the dipole moment tensor. Compared with ideal hydrodynamics without spin, additional terms at the first and second orders in the Knudsen number Κ_(n) and the average spin polarization Χ_(s) have been derived. The Wigner function can be expressed in terms of matrix-valued distributions, whose equilibrium forms are characterized by thermodynamical parameters in quantum statistics. The equations of motion for these parameters are derived by conservation laws at the leading and next-to-leading order Κ_(n) and Χ_(s).

关键词： frame Ideal Spin Hydrodynamics from the Wigner Function Approach

Investigation of the radiosensitization effect in FePt nanopaticle clusters with Monte Carlo simulation

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Nuclear Science and Techniques 2018年第11期29卷 287-294页

作者： peng-Yuan Qi Zhi-Tao Dai Jun Zhang Hong Quan hao peng Key Laboratory of Artificial Micro-and Nano-Structures of the Ministry of Education and Center for Electronic Microscopy and Department of Physics Wuhan UniversityWuhan 430072China Department of Radiation Oncology Zhongnan HospitalWuhan UniversityWuhan 430072China

Nanoparticles(NPs) with high-Z atoms have been widely studied as radiosensitizers for use in cancer therapy. Over the past few years, the application of FePt NPs has attracted extensive research interest. Promising results have been obtained, yet limited knowledge is available regarding its potential use as a *** goal of this study is to investigate the radiosensitization capability of FePt nanoparticle clusters(NPCs) under the exposure of kilovoltage photons using Monte Carlo simulation. First, in order to obtain a realistic distribution of NPCs on the microscopic level, Hela cells were incubated with FePt NPs, and the distribution of NPCs was obtained by optical microscope images and X-ray NanoCT experiments. Based on these images, a simplified cellmodel was developed to evaluate the DER of two material types(FePt and FePt_3). For each type, the dependence of DER on the thickness and angular distribution of NPCs on the surface of the cell membrane was studied quantitatively. Our results suggest that DER is strongly dependent on photon energy and the distance from the NPCs to the nucleus. Fe_1 Pt_3 is able to achieve a higher DER relative to Fe_1 Pt_1. For a given X-ray energy, DER demonstrates an initial increase to a maximum value but gradually saturates as the thickness of NPCs increases from 250 up to 2000 nm due to a trapping effect. The impact on DER resulting from the coexistence of the NPCs on the cell membrane and the nuclear membrane was also investigated.

关键词： FePt nanoparticle Radiosensitization GEANT4 Dose enhancement ratio

Combustion Characteristics and NO Emissions during Co-Combustion of Coal Gangue and Coal Slime in O_(2)/CO_(2) Atmospheres

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Journal of Thermal Science 2023年第1期32卷 457-467页

作者： peng hao WANG Baofeng LI Wenxiu YANG Fengling CHENG Fangqin Institute of Resources and Environmental Engineering Engineering Research Center of CO_(2) Emission Reduction and Resource Utilization-Ministry of Education of the People's Republic of ChinaShanxi UniversityTaiyuan 030006China

Coal slime has low ash content,and adding coal slime during coal gangue combustion may have influence on combustion character;and at this process,NO will emit,and lead to environmental pollution.O_(2)/CO_(2)atmosphere is conducive to NO emission *** combustion characteristics and NO emissions during co-combustion of coal gangue and coal slime in O_(2)/CO_(2)atmospheres were *** results showed the addition of coal slime increased the combustion activity of the mixed fuels in both air and O_(2)/CO_(2)*** co-combustion,there are synergistic effects between them at the fixed carbon combustion stage,and higher blending ratio of coal slime leads to stronger synergistic ***,this study also showed that with the increasing of coal slime blending ratio,the emission concentration of NO increases gradually;with the increase of temperature and O_(2)concentration,the NO emission concentration also gradually increases,and higher O_(2)concentration leads to shorter time required for the complete release of *** that,the results also demonstrate that the proportion of pyrrole and nitrogen oxide in the ashes increases with the increase of combustion temperature,and pyridine and quaternary nitrogen gradually disappear,while the total nitrogen content in ash decreases with the increase of *** results will contribute to a better understanding of the co-combustion process of coal gangue and coal slime in O_(2)/CO_(2)atmosphere,and provide basic data for the practical industrial application of coal gangue and slime.

关键词： coal gangue coal slime O_(2)/CO_(2)atmosphere co-combustion NO emissions

Dynamic network embedding via incremental skip-gram with negative sampling

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Science China(Information Sciences) 2020年第10期63卷 89-107页

作者： hao peng Jianxin LI hao YAN Qiran GONG Senzhang WANG Lin LIU Lihong WANG Xiang REN Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University State Key Laboratory of Software Development Environment Beihang University Collage of Computer Science and Technology Nanjing University of Aeronautics and Astronautics National Computer Network Emergency Response Technical Team/Coordination Center of China Department of Computer Science University of Southern California

Network representation learning, as an approach to learn low dimensional representations of vertices, has attracted considerable research attention recently. It has been proven extremely useful in many machine learning tasks over large graph. Most existing methods focus on learning the structural representations of vertices in a static network, but cannot guarantee an accurate and efficient embedding in a dynamic network scenario. The fundamental problem of continuously capturing the dynamic properties in an efficient way for a dynamic network remains unsolved. To address this issue, we present an efficient incremental skip-gram algorithm with negative sampling for dynamic network embedding, and provide a set of theoretical analyses to characterize the performance guarantee. Specifically, we first partition a dynamic network into the updated, including addition/deletion of links and vertices, and the retained networks over time. Then we factorize the objective function of network embedding into the added, vanished and retained parts of the network. Next we provide a new stochastic gradient-based method, guided by the partitions of the network, to update the nodes and the parameter vectors. The proposed algorithm is proven to yield an objective function value with a bounded difference to that of the original objective function. The first order moment of the objective difference converges in order of O（1/n;）, and the second order moment of the objective difference can be stabilized in order of O（1）. Experimental results show that our proposal can significantly reduce the training time while preserving the comparable performance. We also demonstrate the correctness of the theoretical analysis and the practical usefulness of the dynamic network embedding. We perform extensive experiments on multiple real-world large network datasets over multi-label classification and link prediction tasks to evaluate the effectiveness and efficiency of the proposed framework, and up to

关键词： dynamic network embedding bound and convergence analysis multi-label classification link prediction

秸秆与生物炭施加对茉莉园土壤真菌群落及有机碳库特征的影响

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环境科学 2024年第7期45卷 4228-4240页

作者：彭家豪林少颖王维奇曾瑜陈梅春杨文文陈思聪福建师范大学地理研究所福州350117 福建师范大学湿润亚热带生态-地理过程教育部重点实验室福州350117 闽榕茶业有限公司福州350018 福建省农业科学院农业生物资源研究所福州350003 福州市农业农村局福州350026

为阐明秸秆与生物炭施加后茉莉园土壤真菌群落及有机碳库组分分配的变化特征,测定分析了茉莉园对照、秸秆和生物炭处理0~15 cm土壤真菌群落特征与有机碳库组分,并计算其碳库管理指数(CPMI).结果表明,秸秆与生物炭施加后土壤真菌群落多... 详细信息

为阐明秸秆与生物炭施加后茉莉园土壤真菌群落及有机碳库组分分配的变化特征,测定分析了茉莉园对照、秸秆和生物炭处理0~15 cm土壤真菌群落特征与有机碳库组分,并计算其碳库管理指数(CPMI).结果表明,秸秆与生物炭施加后土壤真菌群落多样性均降低,各处理中优势菌属结构发生变化,生物炭处理下土壤真菌群落结构与秸秆处理和对照组差异显著.冗余分析(RDA)表明,土壤真菌群落结构主要受土壤容重、C∶N、盐度和TN影响.另外,秸秆处理下土壤活性有机碳(LOC)与对照组相比显著增加87.44%(P<0.05),生物炭处理中土壤可溶性有机碳(DOC)、微生物生物量碳(MBC)较对照组分别显著增加22.27%和23.17%(P<0.05).相比于对照组,秸秆处理下碳库活度(L)显著提高(P<0.05),生物炭处理中碳库指数(CPI)显著增加(P<0.05).Spearman相关性分析表明土壤活性有机碳组分受到真菌优势菌属的调控. FUNGuild功能预测结果表明,秸秆与生物炭施加后腐生营养型及其兼性营养型真菌对土壤活性有机碳组分和碳库管理指数有着重要影响.

关键词：秸秆生物炭真菌有机碳库碳库管理指数(CPMI) 茉莉园土壤

Conformation of an Amphiphilic Comb-like Copolymer in a Selective Solvent

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Chinese Journal of Polymer Science 2023年第9期41卷 1386-1391,I0006页

作者： peng hao Xing-Hong Mai Qiao-Yue Chen Ming-Ming Ding Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matter Physics College of Physical Science and TechnologyYili Normal UniversityYining835000China School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou510006China

We study the conformation of an amphiphilic comb-like copolymer in a selective solvent by using Brownian dynamics *** results demonstrate that,there is an optimal total degree of polymerization to form spherical *** when the total degree of polymerization is less than the optimal total degree of polymerization,a unimolecular spherical micelle can be formed,otherwise,the spherical micelle will be transformed into a cylindrical *** the total degree of polymerization is less than the optimal total degree of polymerization,the radius of gyration and the stretching factor meet an exponential relationship,where the power exponent decreases with the increase of the length of hydrophilic side *** fundamental principles uncovered here afford insights for the optimization of molecular design of amphiphilic comb-like copolymers in various applications.

关键词： Comb-like copolymer Conformation Selective solvent Brownian dynamics

中性粒细胞/淋巴细胞比值对穿支动脉病变型脑梗死预后的影响

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医学研究与战创伤救治 2024年第1期37卷 37-41页

作者：宋玲华楼晓莉姜雅斯杨丽慧郭四平彭浩郝永岗苏州大学附属独墅湖医院(苏州市独墅湖医院)神经内科苏州231523 苏州大学公共卫生学院流行病学教研室苏州231523

目的研究影响穿支动脉病变型脑梗死(PAD)不良预后的危险因素。方法回顾性分析2021年9月至2023年5月在苏州大学附属独墅湖医院神经内科住院的174例急性PAD患者。根据90 d改良后Rankin评分(mRS)0~2分为预后良好组,3~6分为预后不良组;使用l... 详细信息

目的研究影响穿支动脉病变型脑梗死(PAD)不良预后的危险因素。方法回顾性分析2021年9月至2023年5月在苏州大学附属独墅湖医院神经内科住院的174例急性PAD患者。根据90 d改良后Rankin评分(mRS)0~2分为预后良好组,3~6分为预后不良组;使用logistic回归模型分析影响PAD患者预后的危险因素。根据病变部位供血动脉所起源颅内大动脉分为前循环(n=101)、后循环组(n=73),分析前循环、后循环与预后不良的相关性。结果多因素logistics回归显示年龄增长(OR=1.071,95%CI:1.012~1.133)、入院NIHSS评分升高(OR=2.764,95%CI:1.868~4.089)、患糖尿病(OR=3.301,95%CI:1.009~10.793)、中性粒细胞/淋巴细胞比值(NLR)升高(OR=2.601,95%CI:1.150~4.482)是PAD患者预后不良的危险因素(P<0.05)。ROC曲线结果提示NIHSS评分以及NLR升高相较于年龄增高以及患糖尿病病史预测PAD患者不良预后的AUC更大,总体敏感性及特异性更高,提示其预测不良预后的价值可能更高。前循环组中LYM下降及NLR上升与预后不良显著相关(P<0.05),后循环组中NE上升、LYM下降以及NLR上升均与预后不良显著相关(P<0.05)。结论基线NLR及NIHSS评分升高,高龄及糖尿病病史可能是PAD患者不良预后的独立危险因素,NLR可作为预测PAD预后的潜在生物学指标值。

关键词：穿支动脉供血区梗死中性粒细胞/淋巴细胞比值 CISS分型