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Nanofluids Transport Model Based on Fokker-Planck Equation and the Convection Heat Transfer Calculation

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Chinese Journal of Mechanical Engineering 2013年第6期26卷 1277-1284页

作者： lin xiaohui ZHANG Chibin YANG Juekuan JIANG Shuyun REN Weisong GU Jun School of Mechanical Engineering Southeast University

In current research about nanofluid convection heat transfer, random motion of nanoparticles in the liquid distribution problem mostly was not considered. In order to study on the distribution of nanoparticles in liquid, nanofluid transport model in pipe is established by using the continuity equation, momentum equation and Fokker-Planck equation. The velocity distribution and the nanoparticles distribution in liquid are obtained by numerical calculation, and the effect of particle size and particle volume fraction on convection heat transfer coefficient of nanofluids is analyzed. The result shows that in high volume fraction （ 0 _-- 0.8% ）, the velocity distribution of nanofluids characterizes as a ＂cork-shaped＂ structure, which is significantly different from viscous fluid with a parabolic distribution. The convection heat transfer coefficient increases while the particle size of nanoparticle in nanofluids decreases. And the convection heat transfer coefficient of nanofluids is in good agreement with the experimental result both in low （0 ~〈 0.1% ） and high （ q = 0.6% ） volume fractions. In presented model, Brown motion, the effect of interactions between nanoparticles and fluid coupling, is also considered, but any phenomenological parameter is not introduced. Nanoparticles in liquid transport distribution can be quantitatively calculated by this model.

关键词： nanofluids convection heat transfer transport theory Fokker-Planck equation

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前交叉韧带损伤研究进展

现代医药卫生 2024年第1期40卷 122-126,131页

作者：王静宇林小慧(综述) 李晓兰(审校) 重庆医科大学附属大学城医院放射科重庆401331

膝关节前交叉韧带损伤是一种常见的运动损伤,该损伤会导致膝关节不稳,降低患者运动能力,从而影响患者生活质量。该文就膝关节前交叉韧带的解剖、损伤危险因素、影像学表现和治疗方面进行综述,旨在为临床预防和治疗前交叉韧带损伤提供进... 详细信息

膝关节前交叉韧带损伤是一种常见的运动损伤,该损伤会导致膝关节不稳,降低患者运动能力,从而影响患者生活质量。该文就膝关节前交叉韧带的解剖、损伤危险因素、影像学表现和治疗方面进行综述,旨在为临床预防和治疗前交叉韧带损伤提供进一步认识。

关键词：膝关节前交叉韧带影像学检查综述

Preparation and Properties of Smart Thermal Control and Radiation Protection Materials for Multi-functional Structure of Small Spacecraft

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Journal of Materials Science & Technology 2011年第10期27卷 879-884页

作者： shijie Zhang Xibin Cao Yingqiang Luan Xinxin Ma xiaohui lin Xianren Kong Research Center of Satellite Technology Harbin Institute of Technology Harbin 150080 China The Second System Design of the Second Research Academy of CASIC Beijing 100854 China

Considering the unique properties of small spacecraft, such as light weight, low power-consumption and high heat flux density, a new kind of lightweight boron carbide （B4C） radiation-protection coating material was proposed. New techniques for preparing LSMO thermal control coating and B4C radiation-protection coating were developed. The sample piece of multi-functional structure was manufactured by using the proposed materials, and a series of performance tests, such as thermal control and radiation-protection behaviors were evaluated. Test results show that： the emissivity of the multi-functional structure varies from 0.42 to 0.86 at 240 K to 353 K and the phase transition temperature is about 260 K. The electron radiation-protection ability of the multi-functional structure is 3.3 times better than that of Al material. The performance index of this multi-functional structure can meet the requirements for space application in on-board electronic equipment.

关键词： Coating material Phase transition temperature Temperature-dependent emissivity-variable Radiation-protection Spacecraft

Poisson-Fokker-Planck model for biomolecules translocation through nanopore driven by electroosmotic flow

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Science China(Physics,Mechanics & Astronomy) 2014年第11期57卷 2104-2113页

作者： lin xiaohui ZHANG ChiBin GU Jun JIANG ShuYun YANG JueKuan School of Mechanical Southeast University

A non-continuous electroosmotic flow model(PFP model)is built based on Poisson equation,Fokker-Planck equation and Navier-Stokse equation,and used to predict the DNA molecule translocation through *** model discards the continuum assumption of ion translocation and considers ions as discrete *** addition,this model includes the contributions of Coulomb electrostatic potential between ions,Brownian motion of ions and viscous friction to ion *** ionic diffusion coefficient and other phenomenological parameters are needed in the PFP *** is worth noting that the PFP model can describe non-equilibrium electroosmotic transportation of ions in a channel of a size comparable with the mean free path of ion.A modified clustering method is proposed for the numerical solution of PFP model,and ion current translocation through nanopore with a radius of 1 nm is simulated using the modified clustering *** external electric field,wall charge density of nanopore,surface charge density of DNA,as well as ion average number density,influence the electroosmotic velocity profile of electrolyte solution,the velocity of DNA translocation through nanopore and ion current *** show that the ion average number density of electrolyte and surface charge density of nanopore have a significant effect on the translocation velocity of DNA and the ion current *** translocation velocity of DNA is proportional to the surface charge density of nanopore,and is inversely proportional to ion average number density of electrolyte ***,the translocation velocity of DNAs can be controlled to improve the accuracy of sequencing by adjusting the external electric field,ion average number density of electrolyte and surface charge density of *** current decreases when the ion average number density is larger than the critical value and increases when the ion average number density is lower than the critical *** numerical simu

关键词： translocation electrolyte Poisson Planck DNA clustering Brownian sequencing contributions proportional

Prognostic Factors Predicting the Postoperative Survival Period Following Treatment for Primary Retroperitoneal Liposarcoma

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Chinese Medical Journal 2015年第1期128卷 85-90页

作者： Xudong Zhao Peiyu Li xiaohui Huang lin Chen Na Liu Yaoguang She Department of General Surgery General Hospital of Chinese People's Liberation Army Beijing 100853 China

Background：Liposarcomas,which represent 20% of all adult sarcomas,are the most common histological type of malignant soft tissue *** aim of this study was to define the prognostic factors that predict the postoperative survival period for patients with primary retroperitoneal liposarcoma.Methods：The clinical data and prognoses of 71 patients with primary retroperitoneal liposarcoma who were treated in the General Hospital of the People＇s Liberation Army of China between January 1,2000 and December 31,2007 were retrospectively reviewed and analyzed.Results：The primary tumor from each patient was resected; 54.9% （39/71） were deemed R0 resections,31.0% （22/71） were R1 resections and 14.1% （10/7 l） were deemed R2 resections （palliative operations）.The median follow up was 68 months （range：1-160 months）.Of the patients who received an R1 or R2 resection of their primary tumor,96.7% （59/61） had tumor *** 1-year,3-year,and 5-year recurrence-free rates were 77.0%,29.8% and 19.7%,*** of April 2013,53 of the 71 patients had died from tumor *** overall l-year,3-year,5-year,and 10-year survival rates were 88.7%,76.1%,61.7%,and 30.4%,*** factors that were significantly associated with prognosis in the univariate analysis were age （as a categorical variable）（P =0.006）,modus operandi （P =0.000）,histologic subtype （P =0.000）,tumor grade （P =0.000）,ascites （P =0.000）,postoperative metastasis （P =0.000） and adjuvant therapy （P =0.030）.However,in the multivariate analysis,the modus operandi （P =0.000）,tumor grade （P =0.006）,ascites （P =0.027）,postoperative metastasis （P =0.023） and age （as a categorical variable）（P =0.002） were the only significant predictors of survival.Conclusions：Complete resection remains the most effective method for treating *** grade,old age （≥60 years old）,postoperative metastasis,and ascites predict poor prognoses.

关键词： General Surgery Liposarcoma Retroperitoneal Neoplasms Survival Therapeutics

粉末冶金Mo–14Re合金热变形行为及微观组织演变

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粉末冶金技术 2024年第3期42卷 297-303页

作者：薛建嵘林小辉李延超梁静张新高选乔杨毅超张文西北有色金属研究院西安710016

通过Gleeble 1500热模拟试验机对粉末冶金法制备的Mo–14Re合金进行了恒应变速率压缩实验,分析了变形温度(1100~1400℃)和应变速率(0.100~0.001 s-1)对流变应力及组织演变的影响,并采用双曲正弦型Arrhenius模型建立了Mo–14Re合金的本... 详细信息

通过Gleeble 1500热模拟试验机对粉末冶金法制备的Mo–14Re合金进行了恒应变速率压缩实验,分析了变形温度(1100~1400℃)和应变速率(0.100~0.001 s-1)对流变应力及组织演变的影响,并采用双曲正弦型Arrhenius模型建立了Mo–14Re合金的本构方程。结果表明:随着变形温度升高或者应变速率降低,粉末冶金Mo–14Re合金在热变形过程的流变应力也随之减小,真应力–真应变曲线表现出明显的加工硬化和动态软化现象。动态软化行为主要归结于粉末冶金Mo–14Re合金热压缩变形处于低应变速率(0.010 s-1和0.001 s-1)或较高变形温度(>1200℃)时发生的动态再结晶,形核方式为晶界凸出形核,随着应变速率的降低或温度的升高,再结晶程度不断增加,晶粒不断长大,当温度为1400℃,应变速率为0.001 s-1时,完全再结晶完成。

关键词： Mo–14Re合金热变形本构方程显微组织

“服务器配置与管理”3D立体虚拟实训平台构建研究

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广东轻工职业技术学院学报 2024年第1期23卷 64-68页

作者：谭超健张凯林晓辉黎荣通林炫华广东交通职业技术学院智慧交通工程学院广东广州510650

随着信息技术发展,虚拟仿真技术在高等教育实训教学中的应用日益广泛。针对服务器配置与管理课程实训教学资源单一、设备不足等问题,设计了一个基于计算机多媒体技术的三维立体虚拟实训平台。该平台包含交互式虚拟课堂、虚拟仿真实训室... 详细信息

随着信息技术发展,虚拟仿真技术在高等教育实训教学中的应用日益广泛。针对服务器配置与管理课程实训教学资源单一、设备不足等问题,设计了一个基于计算机多媒体技术的三维立体虚拟实训平台。该平台包含交互式虚拟课堂、虚拟仿真实训室和虚拟设备实训室三大模块。采用虚拟仿真技术高度还原实训环境,实现对学生的全方位过程考核监控。支持多终端远程访问,实现资源共享。运用Unity3D、WebGL等先进技术手段实现交互式的虚拟场景和任务动画制作。应用结果表明,该平台提高了学生的学习兴趣,增强了操作技能培养质量,为“服务器配置与管理”课程教学改革提供了有效手段。

关键词：虚拟仿真技术立体虚拟实训平台教学改革

Characteristics and environmental significance of rare earth elements in PM2.5 of Nanchang, China

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Journal of Rare Earths 2017年第1期35卷 98-106页

作者： ZHAO Yang YU Ruilian HU Gongren lin xiaohui LIU Xianrong College of Chemical Engineering Huaqiao University Xiamen 361021 China Environmental Protection Agency of Nanchang City Nanchang 330038 China

Concentrations of sixteen rare earth elements（REEs） in PM2.5 and potential-source samples, collected in Nanchang city in mid-September 2013, were determined by inductively coupled plasma mass spectrometry（ICP-MS）. The results showed that the concentrations of total REEs（ΣREE） ranged from 78.76 to 1351 ng/mg. The order of REEs in PM2.5 samples showed the anthropogenic effects, Ce and Eu were affected more than the other REEs according to the enrichment factors. The results of chondrite-normalized REEs patterns and characteristic parameters showed evident light REEs fractionation, and positive anomalies of Ce and Eu in PM2.5. The other non-local pollution sources affected the PM2.5 samples, according to the triangular diagram of La, Ce and Sm compositions and plot of ΣREE vs δEu. Moreover, plot of（La/Sm）N vs（Gd/Yb）N revealed the effects of local sources. In conclusion, the REEs in potential-source samples were close to the background of local soil, while the REEs in PM2.5 samples in Nanchang city were jointly affected by the investigated local sources and other non-local sources.

关键词： PM2.5 rare earth elements composition characteristics distribution pattern enrichment factor

Microglia in drug addiction:A perspective from neuroimmunopharmacology

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Zoological Research 2024年第3期45卷 704-706页

作者： Cong lin xiaohui Wang Laboratory of Chemical Biology Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilin 130022China Beijing National Laboratory for Molecular Sciences Beijing 100190China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefeiAnhui 230026China

Drug addiction refers to a state of dependence that arises from habitual drug intake and can result in specific withdrawal symptoms upon *** most commonly abused substances include psychostimulants,cannabinoids,and *** drugs are consumed,they stimulate the release of dopamine,a neurotransmitter crucial for the pleasure and reward centers of the *** repeated drug use,the brain undergoes various changes,leading to tolerance,dependence,and addiction(Lüscher et al.,2020).The mechanisms involved in drug addiction are highly complex and involve diverse cell types within the brain.

关键词： addiction drugs intake