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Investigation on the mechanism of convective heat and mass transfer with double diffusive effect inside a complex porous medium using lattice Boltzmann method

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Chinese Science Bulletin 2010年第26期55卷 3051-3059页

作者： ZHAO kai xuan YiMin LI Qiang School of Power Engineering Nanjing University of Science & Technology Nanjing 210094 China

A new lattice Boltzmann model is proposed for the coupling of multi-physics in natural convection by introducing another distri-bution function to represent the scalar transport of mass and an additional source term on the right hand side of the lattice Boltz- mann equation (LBE) based on the TD2.9 model. According to the Boussinesq assumption and considering the coupled diffusive effect, the governing equations for the coupling of multi-physics in natural convection is proposed based on the non-equilibrium thermodynamic theory. Combined with the algorithm for the reconstruction of a porous medium, this model is used to investigate the coupled heat and mass transfer under multi-physics of natural convection inside a porous medium at the pore scale. The characteristic of profiles of dimensionless velocity, temperature and concentration are shown graphically for different values of Rayleigh number (Ra) and porosity. Furthermore, the influence of the temperature gradient on the mass transfer inside a porous medium has been examined numerically. Thus, the mechanism of the coupled heat and mass transfer inside a porous medium is investigated numerically at the pore scale innovatively.

关键词：多孔介质自然对流格子玻尔兹曼方法扩散效应传输机制格子Boltzmann模型非平衡热力学理论热质

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基于Web的智能家居监测与控制平台设计

沧州师范学院学报 2024年第1期40卷 22-26页

作者：李国玄王文博马凯凯商丘工学院机械工程学院河南商丘476000

为了提升现代家庭生活的安全性、舒适性、便捷性,设计了一种基于Web的智能家居远程监测与控制平台.平台由家居监控系统、Web服务器平台和Web监控终端三部分组成.采用STM32.为主控核心,采集各传感器模块数据,实现对室内环境的温湿度、... 详细信息

为了提升现代家庭生活的安全性、舒适性、便捷性,设计了一种基于Web的智能家居远程监测与控制平台.平台由家居监控系统、Web服务器平台和Web监控终端三部分组成.采用STM32.为主控核心,采集各传感器模块数据,实现对室内环境的温湿度、空气质量和光照强度的实时监测.同时,通过组网对家电的调控实现远程控制,并通过物联网通信模块M5130-A实现监控系统与服务器的数据交换.Web服务器端采用模型-视图-控制器(MVC)设计模式,实现与监控系统的通信、环境数据的处理和与Web监控终端的通信功能.其中,使用传输控制协议(TCP)实现与监控系统的通信,使用Websocket协议完成服务器与监控终端的通信.运行测试结果表明,该系统稳定、精确、操作性强、人机交互性能优越,具有一定的产业化价值.

关键词：远程控制实时监测 STM32 M5130-A TCP Websocket

A High Sensitivity Laser-Pumped Cesium Magnetometer

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Chinese Physics Letters 2012年第10期29卷 18-20页

作者： HUANG kai-kai LI Nan LU {2.-Hui Institute of Optics Department of PhysicsZhejiang UniversityHangzhou 310027

An atomic magnetometer based on optically detected magnetic resonance is investigated and demonstrated *** build an 894 nm external cavity diode laser which is frequency locked to the F=4→F'=3 transition of Cs D_(1) line with DAVLL *** the phase-locked loop,the frequency of the rf coils is actively locked to the Larmor frequency and the magnetometer tracks the magnetic field variations in a phase coherent *** ultimate sensitivity of 19 fT/Hz^(1/2. and an intrinsic sensitivity of 8.6 pT/Hz^(1/2. in the magnetic environment which is close to geomagnetic field have been achieved with the spatial resolution smaller than 2.cm.

关键词： magnetometer cavity coherent

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Mohs显微描记手术治疗小汗腺汗孔癌一例

中国麻风皮肤病杂志 2024年第2期40卷 113-115页

作者：毕兆华谢凯刘国艳陈声利郭璇山东第一医科大学附属皮肤病医院山东济南250022 山东省皮肤病性病防治研究所山东济南250022

患者,男,56岁。左颞部肿物4年余,切除后复发半年。组织病理示:真皮内肿瘤团块,部分伴中央片状坏死。免疫组化示:肿瘤细胞CK5/6阳性,瘤团坏死周边瘤细胞EMA阳性。诊断为小汗腺汗孔癌。Mohs显微手术切除及全厚皮片移植术后恢复良好,随访1... 详细信息

患者,男,56岁。左颞部肿物4年余,切除后复发半年。组织病理示:真皮内肿瘤团块,部分伴中央片状坏死。免疫组化示:肿瘤细胞CK5/6阳性,瘤团坏死周边瘤细胞EMA阳性。诊断为小汗腺汗孔癌。Mohs显微手术切除及全厚皮片移植术后恢复良好,随访18个月无复发。

关键词：附属器肿瘤小汗腺汗孔癌面部

Pullback Attractors for a Damped Semilinear Wave Equation with Delays

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Acta Mathematica Sinica,English Series 2018年第7期34卷 1131-1150页

作者： kai xuan ZHU Yong Qin XIE Feng ZHOU Hu'nan Province Cooperative Innovation Center for the Construction and Development of Dongting Lake Ecological Economic Zone College of Mathematics and Computational Science Hu'nan University of Arts and Science Changde 415000 P. R. China School of Mathematics and Statistics Changsha University of Science and Technology Changsha 410114 P. R. China College of Science China University of Petroleum (East China) Qingdao 266580 P. R. China

In this paper, we consider the weakly damped wave equations with hereditary effects, and the nonlinearity f satisfies critical growth. The delay term g（t, ut） may be driven by a function with very weak assumptions, namely, just measurability. We analyze the well-posedness of solutions and verify the existence of the pullback ：D-attractor in CH01（Ω） × CL2.（Ω） by constructing the energy functional and combining with the idea of the contractive function.

关键词： Wave equations critical nonlinearity delays pullback attractors

胃癌细胞外泌体经miRNA触发肝Kupffer细胞M2.极化以促进肝转移前生态位的形成

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中华微生物学和免疫学杂志 2024年第9期44卷 762-770页

作者：张轩刘炜付海啸李腾腾刘浩符炜王凯徐州医科大学附属医院胃肠外科徐州221002

目的探讨胃癌细胞来源的外泌体与肝Kupffer细胞间的相互作用对胃癌肝转移的影响,并揭示其潜在的作用机制。方法通过裸鼠模型、病毒转染和流式分选技术,从胃癌细胞株(MKN45)中构建具有高度肝转移潜能的细胞株(MKN45-HL)。超速离心法收集... 详细信息

目的探讨胃癌细胞来源的外泌体与肝Kupffer细胞间的相互作用对胃癌肝转移的影响,并揭示其潜在的作用机制。方法通过裸鼠模型、病毒转染和流式分选技术,从胃癌细胞株(MKN45)中构建具有高度肝转移潜能的细胞株(MKN45-HL)。超速离心法收集外泌体,并通过纳米流式仪、透射电镜以及Western blot等进行表征和鉴定。构建胃癌细胞外泌体训导的裸鼠肝转移模型,并经活体成像技术监测肝转移灶的发展。通过细胞培养、qRT-PCR和免疫荧光染色等分析胃癌细胞外泌体对巨噬细胞极化的作用。利用外泌体miRNA的组学分析和qRT-PCR筛选验证胃癌外泌体促巨噬细胞M2.化的miRNA分子靶点。结果胃癌来源的外泌体主要集中在肝脏,大多数被肝内巨噬细胞所摄取,且在体外培养和裸鼠体内都能促进巨噬细胞向M2.极化。MKN45与MKN45-HL外泌体训导的裸鼠经脾脏注射小鼠前胃癌细胞后均出现明显的肝转移灶,且MKN45-HL外泌体表现出更强的促肝脏巨噬细胞M2.化和促胃癌细胞肝转移的能力。两者的miRNA组学分析显示了很多差异性表达的miRNAs。高肝转移潜力的胃癌细胞系和肝转移患者血清外泌体中miR-519a-3p显著升高,可经外泌体被巨噬细胞内化,对胃癌肝转移有预测价值,并与肝转移预后密切相关。结论胃癌细胞来源的外泌体经miR-519a-3p触发肝Kupffer细胞的M2.极化,推进胃癌的肝转移进程,可能是塑造胃癌肝转移前生态位微环境的重要分子。本研究为揭示胃癌肝转移机制提供了新视角,并为未来的治疗策略提供了潜在靶点。

关键词：胃癌外泌体 Kupffer细胞 M2.极化肝转移前生态位

基于便携GC-MS和HS/SPME-GC×GC-TOF MS分析化州橘红与广西橘红成分差异

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质谱学报 2024年第5期45卷 631-639页

作者：李凯旋黄罗旭吴曼曼徐经纬谭国斌罗思凡周振暨南大学质谱仪器与大气环境研究所广东省大气污染在线源解析系统工程技术研究中心广东广州510632 华南理工大学环境与能源学院发光材料与器件国家重点实验室广东省大气环境与污染控制重点实验室广东广州510006 广东省麦思科学仪器创新研究院广东广州510530 广州禾信仪器股份有限公司广东广州510530

为探究不同产地橘红挥发性成分之间的差异,本研究采用便携气相色谱-质谱(GC-MS)和顶空固相微萃取结合全二维气相色谱-飞行时间质谱(GC×GC-TOF MS)技术分析化州橘红和广西橘红的挥发性成分。结果表明,便携GC-MS只能初步区分化州橘红和... 详细信息

为探究不同产地橘红挥发性成分之间的差异,本研究采用便携气相色谱-质谱(GC-MS)和顶空固相微萃取结合全二维气相色谱-飞行时间质谱(GC×GC-TOF MS)技术分析化州橘红和广西橘红的挥发性成分。结果表明,便携GC-MS只能初步区分化州橘红和广西橘红,不能确定化州橘红的特征标志物;利用主成分分析法(PCA)和正交偏最小二乘法(OPLS-DA)对GC×GC-TOF MS实验数据进行处理,根据|p(corr)|>9和|p|>0.06结合VIP>1.1,共筛选出10种化州橘红标志物。该研究为化州橘红药材的质量评价与鉴定提供了依据,也为其他中药质量评价提供了方法参考。

关键词：橘红便携气相色谱-质谱全二维气相色谱-飞行时间质谱(GC×GC-TOF MS) 顶空固相微萃取(HS/SPME) 化学计量学分析

An economic and low-carbon day-ahead Pareto-optimal scheduling for wind farm integrated power systems with demand response

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Journal of Modern Power Systems and Clean Energy 2015年第3期3卷 393-401页

作者： Rui MA kai LI xuan LI Zeyu QIN Hunan Key Laboratory of Smart Grids Operation and Control Changsha University of Science&TechnologyChangsha 410114China

Demand response(DR)and wind power are beneficial to low-carbon electricity to deal with energy and environmental ***,the uncertain wind power generation(WG)which has anti-peaking characteristic would be hard to exert its ability in carbon *** paper introduces DR into traditional unit commitment(UC)strategy and proposes a multi-objective day-ahead optimal scheduling model for wind farm integrated power systems,since incentive-based DR can accommodate excess wind power and can be used as a source of system spinning reserve to alleviate generation side reserve pressure during both peak and valley load ***,net load curve is obtained by forecasting load and wind power ***,considering the behavior of DR,a day-ahead optimal dispatching scheme is proposed with objectives of minimum generating cost and carbon ***-dominated sorting genetic algorithm-II(NSGA-II)and satisfaction-maximizing method are adopted to solve the multi-objective model with Pareto fronts and eclectic decision ***,a case study is carried out to demonstrate that the approach can achieve economic and environmental aims and DR can help to accommodate the wind power.

关键词： Low-carbon electricity Unit commitment(UC) Day-ahead scheduling Multi-objective optimization Demand response(DR) Non-dominated sorting genetic algorithm-II(NSGA-II)algorithm

A novel method to determine effective thermal conductivity of porous materials

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Science China(Technological Sciences) 2004年第6期47卷 716-724页

作者： QIAN Jiyu LI Qiang YU kai xuan Yimin School of Power Engineering Nanjing University of Science and TechnologyNanjing 210094China

A 2. Lattice-Boltzmann (LB) model is proposed for analyzing the heat conduction process in the porous media. The effective thermal conductivities of several porous materials are calculated by means of this model. The calculated results are found to be in excellent agreement with the experimental data of the existing references. The factors affecting the effective thermal conductivity of porous materials are discussed. The results show that the effective thermal conductivity is strongly dependent upon the porosity and the pore structure and only has imperceptible dependence on the pore density. Then the correlation for estimating the effective thermal conductivity of the porous material is established. This LB model can be used conveniently to calculate and analyze the heat conduction problems of porous media or other materials with complex geometry boundary in pore scale. Keywords Lattice-Boltzann - porous media - effective thermal conductivity

关键词： Lattice-Boltzann porous media effective thermal conductivity