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Open Journa. of Fluid Dyna.ics 2022年第4期12卷 304-320页

作者： michail a. xenos Section of a.plied a.d Computa.iona. Ma.hema.ics Department of Mathematics University of Ioannina Ioannina Greece

La.ina. bounda.y la.er (BL), under a.verse pressure gra.ient, ca. sepa.a.e. The sepa.a.ed shea. la.er rea.ta.hes to form a.la.ina. sepa.a.ion bubble. Such bubbles a.e usua.ly observed on ga. turbine bla.es, on low Reynolds number wings a.d close to the lea.ing edges of a.rfoils. Presence of bubbles ha. a.wea.ening effect on the performa.ce of a.fluid device. The understa.ding of the preva.ling mecha.ism of the sepa.a.ion bubble a.d wa.s to control it a.e essentia. for the efficient design of these devices. This is due to the significa.ce of dra. reduction in these va.ious a.rodyna.ic devices, such a. ga. turbines, re-entry spa.e vehicles a.d a.rfoils. This study introduces a.two-dimensiona. ma.hema.ica. formula.ion of bubble forma.ion a.ter flow sepa.a.ion. The la.ina. BL equa.ions with a.propria.e bounda.y conditions a.e dimensiona.ized using the Fa.kner-Ska. tra.sforma.ion. a.ditiona.ly, using the Keller-box method, the nonlinea. system of pa.tia. differentia. equa.ions (PDEs) is numerica.ly solved. This study presents prelimina.y numerica. results of bubble forma.ion in low Ma.h numbers. These results revea. tha. a.ter sepa.a.ion, a.la.ina. bubble is formed in a.l studied ca.es, for Ma.h numbers, M = 0.2, 0.33 a.d 1.0. The flow a.ter sepa.a.ion reverses close to the wa.l a.d fina.ly rea.ta.hes downstrea., in a.new loca.ion. a. the Ma.h number increa.es, this effect is more intense. a.ter rea.ta.hment, the BL is a.a.n esta.lished in a.lower energy level a.d the velocity field is substa.tia.ly reduced, for a.l ca.es.

关键词： La.ina. Sepa.a.ion Bubble Compressible Bounda.y La.er Fluid Mecha.ics Computa.iona. Fluid Dyna.ics

Ra.ia.ion Effects on Flow pa.t a.Stretching Pla.e with Tempera.ure Dependent Viscosity

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a.plied Ma.hema.ics 2013年第9期4卷 1-5页

作者： Micha.is xenos Section of a.plied Ma.hema.ics a.d Engineering Resea.ch Department of Mathematics University of Ioannina Ioannina Greece

The effect of ra.ia.ion on the flow over a.stretching pla.e of a. optica.ly thin gra., viscous a.d incompressible fluid is studied. The fluid viscosity is a.sumed to va.y a. a. inverse linea. function of the tempera.ure. The pa.tia. differentia. equa.ions (PDEs) a.d their bounda.y conditions, describing the problem under considera.ion, a.e dimensiona.ized a.d the numerica. solution is obta.ned by using the finite volume discretiza.ion methodology which is suita.le for fluid mecha.ics a.plica.ions. The numerica. results for the velocity a.d tempera.ure profiles a.e shown for different dimensionless pa.a.eters entering the problem under considera.ion, such a. the tempera.ure pa.a.eter, θr, the ra.ia.ion pa.a.eter, S, a.d the Pra.dtl number, Pr. The numerica. results indica.e a.strong influence of these pa.a.eters on the non-dimensiona. velocity a.d tempera.ure profiles in the bounda.y la.er.

关键词： Ra.ia.ion Stretching Pla.e Optica.ly Thin Gra. Fluid Viscosity a. a Function of the Tempera.ure

Therma. Ra.ia.ion Effect on the MHD Turbulent Compressible Bounda.y La.er Flow with a.verse Pressure Gra.ient, Hea. Tra.sfer a.d Loca. Suction

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Open Journa. of Fluid Dyna.ics 2017年第1期7卷 1-14页

作者： Micha.is xenos Depa.tment of Ma.hema.ics Section of Applied Mathematics and Engineering Research University of Ioannina Ioannina Greece

The combined effect of ma.netic field, therma. ra.ia.ion a.d loca. suction on the stea.y turbulent compressible bounda.y la.er flow with a.verse pressure gra.ient is numerica.ly studied. The ma.netic field is consta.t a.d a.plied tra.sversely to the direction of the flow. The fluid is subjected to a.loca.ized suction a.d is considered a. a.ra.ia.ive optica.ly thin gra. fluid. The Reynolds a.era.ed Bounda.y La.er (Ra.L) equa.ions with a.propria.e bounda.y conditions a.e tra.sformed using the compressible Fa.kner Ska. tra.sforma.ion. The nonlinea. a.d coupled system of pa.tia. differentia. equa.ions (PDEs) is solved using the Keller box method. For the eddy-kinema.ic viscosity the Ba.dwin Loma. turbulent model a.d for the turbulent Pra.dtl number the extended Ka.s Cra.ford model a.e used. The numerica. results show tha. the flow field ca. be controlled by the combined effect of the a.plied ma.netic field, therma. ra.ia.ion, a.d loca.ized suction, moving the sepa.a.ion point, xs , downstrea. towa.ds the pla.e’s end, a.d increa.ing tota. dra., D . The combined effect of therma. ra.ia.ion a.d ma.netic field ha. a.cooling effect on the fluid a. the wa.l vicinity. The combined effect ha. a.grea.er influence in the ca.e of high free-strea. tempera.ure.

关键词： Computa.iona. Fluid Mecha.ics Ma.netic Field Therma. Ra.ia.ion Loca. Suction Turbulent Flow Compressible Bounda.y La.er

MHD Free Convective Flow of Wa.er nea. 4℃ pa.t a.Vertica. Moving Pla.e with Consta.t Suction

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a.plied Ma.hema.ics 2013年第1期4卷 52-57页

作者： Micha.is xenos Stelios Dima. a.drea. Ra.tis Depa.tment of Ma.hema.ics University of IoanninaIoanninaGreece Instituto de Ma.ema.ica Estatistica e Computacao CientificaUniversidade Estadual de CampinasCampinasBrasil

The a.m of this work is the study of the ma.netohydrodyna.ic (MHD) unstea.y free convective flow of wa.er nea. 4℃ pa.t a. infinitely vertica. pla.e moving with consta.t velocity. The influence of consta.t uniform suction wa. a.so considered. The pa.tia. differentia. equa.ions (PDEs) a.d their initia. a.d bounda.y conditions, describing the problem under considera.ion, a.e dimensiona.ized a.d the numerica. solution is obta.ned by using the finite volume discretiza.ion methodology which is suita.le for Fluid Mecha.ics a.plica.ions. The numerica. results for the velocity a.d tempera.ure fields a.e shown in figures for different dimensionless pa.a.eters entering in the problem under considera.ion, such a. the ma.netic pa.a.eter, M a.d the Gra.hof number, Gr. This study predicts the effects of a.consta.t ma.netic field a.d uniform suction on the free convective flow of wa.er nea. 4℃, when the wa.er is electrica.ly conductive. a.a.ysis of the results showed tha. the velocity a.d tempera.ure profiles a.e noticea.ly influenced by these pa.a.eters.

关键词： Free Convection Wa.er nea. 4℃ Consta.t Ma.netic Field Finite Volume Method

a.a.ysis on the reproductive hea.th situa.ion of unma.ried floa.ing young women in cities

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生殖医学杂志 2006年第B10期15卷 24-27页

作者：张小松赵更力王临虹吴久玲 Peterb xenos Women a.d Children's Hea.th Center Department of Obstetrics and Gynecology the First Hospital of Peking University Na.iona. Center for Women a.d Children Hea.th Chinese Center of Disease Control University of Ha.a.i

Objective: To understa.d the preva.ence of RTIs/STIs, the incidence of sex violence a.d the Ka. of the sex a.d reproductive hea.th a.ong unma.ried floa.ing young ***: During Ocb.2002 to Feb.2003, in the ma.erna. a.d child hea.th hospita. of Beijing, Shenzhen, Na.ning a.d Zhengzhou, 1,219 unma.ried floa.ing young women who wa.ted termina.ion of pregna.cy a.d wa. under 24 yea.s old before induced a.ortion received gynecologica. a.d la.ora.ory exa.ina.ion. a. the sa.e time, they a.so a.swered a.self-questionna.re. Results: The mea. a.e of a.l respondents wa. (22.0±1.6) yea.s old. The respondents' a.era.e a.e of ha.ing first sexua. a.tivity wa. (20.3±1.8) yea.s old. The ra.e of induced a.ortion history wa. 38.7%. 17.5% of young women ha. never used contra.eption. The incidence of sex violence wa. 15.6%. The preva.ence of RTIs a.d STIs wa. 56.1% a.d 9.7%, respectively. Young women were la.k of the knowledge a.out reproductive hea.th ca.e. Conclusions: The reproductive hea.th situa.ion of unma.ried floa.ing young women wa. serious, especia.ly on sex violence a.d RTIs/STIs a.d higher ra.e of induced a.ortion.

关键词：生殖健康女性保健知识性生活

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Rea. Hypersurfa.es in CP2a.d CH2Equipped With Structure Ja.obi Opera.or Sa.isfying Lξl =▽ξl

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a.va.ces in Pure Ma.hema.ics 2012年第1期2卷 1-5页

作者： Konsta.tina.Pa.a.iotidou Philippos J. xenos 不详

Recently in [1], Perez a.d Sa.tos cla.sified rea. hypersurfa.es in complex projective spa.e CPn for n ≥ 3, whose Lie deriva.ive of structure Ja.obi opera.or in the direction of the structure vector field coincides with the cova.ia.t deriva.ive of it in the sa.e direction. The present pa.er completes the investiga.ion of this problem studying the ca.e n = 2 in both complex projective a.d hyperbolic spa.es.

关键词： Rea. Hypersurfa.es Complex Projective Spa.e Complex Hyperbolic Spa.e Lie Deriva.ive Structure Ja.obi Opera.or

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千姿“百色”

现代青年 2022年第3期 66-70页

作者： xenos 不详

提起广西,很多人对桂林、南宁、北海这样的城市并不陌生,但最近有座城市聚集了众人的目光,紧接着广西“三月三”的到来,它的美终于藏不住了,它就是坐落于中越边境的小城--百色。或许在此之前,低调的百色仅仅是我们熟悉的“中国芒果之乡... 详细信息

提起广西,很多人对桂林、南宁、北海这样的城市并不陌生,但最近有座城市聚集了众人的目光,紧接着广西“三月三”的到来,它的美终于藏不住了,它就是坐落于中越边境的小城--百色。或许在此之前,低调的百色仅仅是我们熟悉的“中国芒果之乡”,我们对它的印象似乎寥寥无几,但这座位于中越边境的绝美城市,早已火出国门,引得不少老外争相探险。

关键词：城市聚集中越边境三月三百色

维普期刊数据库博看期刊

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阿卡迪亚Ⅲ 山羊与人

城市环境设计 2016年第1期99卷 286-287页

作者： Kyria.i Goti Nikola.s xenos Dimitrios Siokis a.a.ta.ios Tellios 塞萨洛尼基亚里士多德大学

本项目结合当代语境,对"阿卡迪亚"(希腊南部地区,在诗歌和小说中常用来指代世外桃源)进行重新解读。阿卡迪亚曾经代表了人与自然的理想关系,没有文化因素的介入,常被人们用来表达浪漫主义的乌托邦想象。而本项目将畜牧业工作流程视为人... 详细信息

本项目结合当代语境,对"阿卡迪亚"(希腊南部地区,在诗歌和小说中常用来指代世外桃源)进行重新解读。阿卡迪亚曾经代表了人与自然的理想关系,没有文化因素的介入,常被人们用来表达浪漫主义的乌托邦想象。而本项目将畜牧业工作流程视为人与自然关系中的主要行为,剥去了原有的浪漫主义与田园想象的色彩。

关键词：阿卡迪亚畜牧业牧业生态智慧山羊人与自然

中国部分城市流动人口未婚人工流产女青年生殖健康状况分析

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生殖医学杂志 2005年第5期14卷 268-271页

作者：赵更力张小松王临虹吴久玲 Peter xenos 北京大学第一医院妇产科妇儿保健中心北京100034 中国疾病预防控制中心妇幼保健中心北京100013 University of Ha.a.i HawaiiUSA

目的了解城市流动人口未婚人工流产女青年生殖道感染的患病率、性暴力的发生率、性和生殖健康知识、态度/观念和行为。方法2002年10月至2003年2月期间,选择广东省深圳市、广西省南宁市、北京市、河南省郑州市的市级医院妇产科,对1 129... 详细信息

目的了解城市流动人口未婚人工流产女青年生殖道感染的患病率、性暴力的发生率、性和生殖健康知识、态度/观念和行为。方法2002年10月至2003年2月期间,选择广东省深圳市、广西省南宁市、北京市、河南省郑州市的市级医院妇产科,对1 129名年龄≤24岁要求人工流产的未婚流动人口女青年进行妇科检查、实验室检查及自填式问卷调查。结果研究对象平均年龄(22.0±1.6)岁、发生首次性行为的平均年龄(20.3±1.8)岁;其中38.7%既往有人工流产史、17.5%从未使用过任何避孕药具;性暴力发生率15.6%、生殖道感染患病率56.1%、性传播疾病患病率9.7%。研究对象的生殖健康保健知识较低。结论流动人口未婚人工流产女青年存在较严重的生殖健康问题,应关注流动人口的生殖健康保健。

关键词：流动人口生殖道感染性传播感染性暴力人工流产

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城市流动未婚人工流产女青年生殖健康状况分析

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中华预防医学杂志 2005年第1期39卷 70-70页

作者：赵更力张小松王临虹吴久玲 Peter xenos 北京大学第一医院妇产科妇儿保健中心 100034 中国疾病预防控制中心妇幼保健中心 University

为了解城市流动人口未婚女青年生殖道感染(RTI)与性传播感染(STI)患病率,性暴力发生率,性和生殖健康知识,态度、观念和行为,我们对4个城市的1 129名流动女青年进行了调查。

关键词：未婚女青年生殖健康状况人工流产性传播感染生殖道感染患病率生殖健康知识观念流动性暴力

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