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Friction 2024年第2期12卷 271-290页

作者： Shaohua LI Xiaohui LIN shuyun jiang School of Mechanical Engineering Southeast UniversityNanjing 211189China

Bubbly oil lubrication is a type of lubrication ***,the lubrication model of the bubbly oil has not been thoroughly *** paper aims to investigate the modelling for bubbly oil lubrication considering the interfacial effect and thermal effect,and a theoretical model is established based on the theory of multiphase *** interfacial and thermal effects on the static characteristics of a thrust bearing are analyzed.A test rig for the thrust bearing is developed to measure the static characteristics of the bearing under bubbly oil *** results show that the bearing static characteristics,*** temperature rise,film thickness,friction torque,and volume flow,increase with consideration of three interfacial effects;the bearing temperature rise increases but the film thickness,friction torque,and volume flow rate decrease with consideration of the three thermal effects;the thermal effect on the bearing static characteristics is greater than the interfacial effect.

关键词： bubbly oil lubrication theory of multiphase mixtures interfacial effect thermal effect fluid bearing

肠道准备综合护理在糖尿病患者肠镜检查中的应用效果

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中国社区医师 2024年第3期40卷 136-138页

作者：蒋淑云东南大学附属中大医院内分泌科江苏南京210009

目的:探讨肠道准备综合护理在糖尿病患者肠镜检查中的应用效果。方法:选取2019年1月—2021年4月于东南大学附属中大医院行肠镜检查的糖尿病患者336例作为研究对象,依据随机数字表法分为试验组和对照组,各168例。对照组实施常规护理,试... 详细信息

目的:探讨肠道准备综合护理在糖尿病患者肠镜检查中的应用效果。方法:选取2019年1月—2021年4月于东南大学附属中大医院行肠镜检查的糖尿病患者336例作为研究对象,依据随机数字表法分为试验组和对照组,各168例。对照组实施常规护理,试验组实施肠道准备综合护理。比较两组护理效果。结果:试验组右半结肠、左半结肠、横结肠Boston肠道准备量表评分和总分高于对照组,差异有统计学意义(P0.05);检查当天7:00、检查前0.5 h和肠镜检查后,试验组血糖水平高于对照组,差异有统计学意义(P<0.05)。试验组低血糖发生率低于对照组,差异有统计学意义(P=0.012)。结论:肠道准备综合护理在糖尿病患者肠镜检查中的应用效果显著,可提升肠道清洁效果,降低低血糖发生率。

关键词：肠道准备综合护理糖尿病肠镜检查肠道清洁血糖监测

Dynamic Characteristics of High-speed Water-Lubricated Spiral Groove Thrust Bearing Based on Turbulent Cavitating Flow Lubrication Model

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Chinese Journal of Mechanical Engineering 2022年第1期35卷 91-111页

作者： Xiaohui Lin Shun Wang shuyun jiang Shaowen Zhang School of Mechanical Engineering Southeast UniversityNanjing 210000China

The water-lubricated bearings are usually the state of turbulent cavitating flow under high-speed conditions. And the distribution of cavitation bubbles and the interface effect between the two phases have not been included in previous studies on high-speed water-lubricated bearings. In order to study the influence of interface effect and cavitation bubble distribution on the dynamic characteristics of high-speed water-lubricated spiral groove thrust bearings(SGTB).A turbulent cavitating flow lubrication model based on two-phase fluid and population balance equation of bubbles was established in this paper. Stiffness and the damping coefficients of the SGTB were calculated using the perturbation pressure equations. An experimental apparatus was developed to verify the theoretical model. Simulating and experimental results show that the small-sized bubbles tend to generate in the turbulent cavitating flow when at a high rotary speed, and the bubbles mainly locate at the edges of the spiral groove. The simulating results also show that the direct stiffness coefficients are increased due to cavitation effect, and cross stiffness coefficients and damping coefficients are hardly affected by the cavitation effect. Turbulent effect on the dynamic characteristics of SGTB is much stronger than the cavitating effect.

关键词： Spiral groove thrust bearings Water lubrication Turbulent lubrication Cavitating flow Dynamic characteristics

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非综合征型家族性非髓样甲状腺癌的研究进展

中华耳鼻咽喉头颈外科杂志 2024年第6期59卷 658-662页

作者：马钦莹马志军蒋树云毛霖玉素甫·买买提王宇飞王晓武青海大学研究生院西宁810016 青海大学附属医院肿瘤外科西宁810012 湖北省肿瘤医院头颈外科武汉430079

家族性非髓样甲状腺癌(familial non-medullary thyroid carcinoma,FNMTC)是指家族一级亲属间具有2个或2个以上非髓样甲状腺癌(non-medullary thyroid carcinoma,NMTC)患者,并排除头颈部放射线暴露史的一类甲状腺肿瘤。根据临床表现不同... 详细信息

家族性非髓样甲状腺癌(familial non-medullary thyroid carcinoma,FNMTC)是指家族一级亲属间具有2个或2个以上非髓样甲状腺癌(non-medullary thyroid carcinoma,NMTC)患者,并排除头颈部放射线暴露史的一类甲状腺肿瘤。根据临床表现不同将FNMTC分为以非甲状腺肿瘤为主要表现的家族性肿瘤综合征和以分化型甲状腺癌为主要表现的非综合征型。FNMTC是否具有不同于散发性非髓样甲状腺癌(sporadic non-medullary thyroid carcinoma,SNMTC)的临床病理学特征及治疗方式尚存在争议,近期研究提示FNMTC较SNMTC患者恶性程度更高,发生转移的风险更大,应予更积极的治疗。因此,本文就FNMTC的病因、病理特点及诊疗措施的最新进展作一综述,以期为FNMTC在临床中的个体化诊疗提供一些参考。

关键词：分化型甲状腺癌一级亲属甲状腺肿瘤临床病理学特征非综合征型暴露史个体化诊疗恶性程度

Study on electromechanical coupling nonlinear vibration of flywheel energy storage system

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Science China(Technological Sciences) 2006年第1期49卷 61-77页

作者： jiang shuyun JU Lihua Department of Mechanical Engineering Southeast University Nanjing 210096 China Department of Mechanical Engineering Southeast University Nanjing 210096 China

The electromechanical coupling dynamics of the flywheel energy storage system (FESS) with a hybrid permanent magnetic-dynamic spiral groove bearing has been studied. The functions of the kinetic energy, the potential energys, the magnetic field energy in air gap of the flywheel motor and the energy dissipation of the whole system were obtained, and the differential equations set with electromagnetic parameters of FESS was established by applying the extended Lagrange-Maxwell equation. The four-order implicit Runge-Kutta formula to the equations was derived, and the nonlinear algebraic equations were solved by using the Gauss-Newton method. The analytical solution of an example shows that the upper damping coefficient, the lower damping coefficient and the residual magnetic induction of the rare earth permanent magnet play an important role in electromechanical resonance of the flywheel rotor system. There is a small change for the electromechanical coupling resonance frequency with the upper damping coefficient in-creasing, but the resonance amplitude decreases with the upper damping coefficient in-creasing. With the lower damping coefficient increasing, the resonance frequency in-creases, and the resonance amplitude decreases. With the residual magnetic induction of the permanent magnet increasing, the resonance frequency decreases, and the reso-nance amplitude increases.

关键词： flywheel energy storage system, hybrid permanent magnetic-dynamic spiral groove bearing, electromechanical coupling dynamics, Lagrange-Maxwell equation.

肺移植术后膈肌移动度与自主呼吸试验期间呼吸功能参数的相关性

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临床超声医学杂志 2024年第4期26卷 306-309页

作者：王宋姜淑云张佳悦董妍田静许红阳南京医科大学无锡医学中心、南京医科大学附属无锡人民医院重症医学科江苏省无锡市214000

目的应用超声测量肺移植术后患者膈肌移动度(DE),分析其与自主呼吸试验(SBT)期间呼吸功能参数的相关性。方法选取于我院心肺诊疗中心行肺移植术患者114例,根据肺移植术后通过SBT的初次撤机结果分为撤机成功组92例和撤机失败组22例,均于... 详细信息

目的应用超声测量肺移植术后患者膈肌移动度(DE),分析其与自主呼吸试验(SBT)期间呼吸功能参数的相关性。方法选取于我院心肺诊疗中心行肺移植术患者114例,根据肺移植术后通过SBT的初次撤机结果分为撤机成功组92例和撤机失败组22例,均于SBT期间监测呼吸功能参数,包括血氧分压(PaO_(2))、潮气量(VT)、浅快呼吸指数(RSBI)及呼吸机支持时间;应用超声测量DE,比较两组上述参数的差异。采用Pearson相关分析法分析DE与呼吸功能参数的相关性。结果撤机成功组DE、PaO_(2)、VT均高于撤机失败组,RSBI低于撤机失败组,呼吸机支持时间短于撤机失败组,差异均有统计学意义(均P<0.05)。相关性分析显示,DE与PaO_(2)、VT、RSBI及呼吸机支持时间均存在相关性(r=0.478、0.734、-0.593、-0.567,均P<0.05)。结论肺移植术后超声所测DE与SBT期间呼吸功能参数均相关,可用于肺移植术后呼吸功能的评估以指导撤机时机的选择。

关键词：超声检查膈肌肺移植术呼吸监测

A Coulomb explosion theoretical model of femtosecond laser ablation materials

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Science China(Technological Sciences) 2012年第3期55卷 694-701页

作者： LIN XiaoHui CHEN HaiQuan jiang shuyun ZHANG ChiBin Department of Mechanical Engineering Southeast UniversityNanjing 210096China

In this paper,a kinetic theory of Vlasov equation is proposed to depict electron and ion's nonequilibrium transport processes in a femtosecond time scale.A Coulomb explosion model of femtosecond laser ablation of materials is proposed and numerically *** mechanism of surface Coulomb explosion induced by self-consisted electric field and the impact of laser parameters on the ablation of materials are quantitatively *** ablation depths calculated by the model are in good agreement with the experimental *** is shown that,the intensity of self-consisted electric field generated on the dielectric material's surface is much greater than that generated on the metal or the semiconductor material's surface,and Coulomb explosion ablation is more easily to occur on the dielectric material's surface.

关键词：库仑爆炸烧蚀材料飞秒激光爆炸模型 Vlasov方程动力学理论半导体材料电介质材料

Corrosion behavior of amorphous/nanocrystalline Al-Cr-Fe film deposited by double glow plasmas technique

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Science China(Technological Sciences) 2009年第5期52卷 1225-1233页

作者： XU jiang CHEN ZheYuan TAO Jie jiang shuyun LIU ZiLi XU Zhong Department of Material Science and Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Mechanical Engineering Southeast UniversityNanjing 210096China

In order to improve the corrosion resistance of AZ31 magnesium alloy,the amorphous/nanocrystal Al-Cr-Fe film has been successfully prepared on AZ31 magnesium alloy by double glow plasma *** amorphous/nanocrystalline consists of two different regions,i.e.,an amorphous layer on outmost surface and an underlying lamellar nanocrystalline layer with a grain size of less than 10 *** corrosion behavior of amorphous/nanocrystalline Al-Cr-Fe film in 3.5% NaCl solution is investi-gated using an electrochemical polarization *** with the AZ31 magnesium alloy,the amorphous/nanocrystalline Al-Cr-Fe film exhibits more positive corrosion potentials and lower corrosion current densities than that of AZ31 magnesium *** measurement reveals that the passive film formed on the Al-Cr-Fe film after the anodic polarization tests is strongly enriched in Cr2O3,Fe2O3 and Al2O3 at outer surface of the film and in the inner layer consists of Cr2O3,FeO and Al2O3.

关键词： double glow sputtering Al-Cr-Fe film AZ31 magnesium alloy corrosion behavior amorphous/nanocrystal

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

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：渗流模型泊松方程纳米孔 Fokker-Planck方程易位电渗生物分子表面电荷密度