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Experimental Ch.racterization of th. Supersonic Transitional Wake Downstream of a Single Rough.ess Element

Journal of Th.rmal Science 2020年第4期29卷 1085-1093页

作者： BOTTINI h.nny SARACOGLU Bayindir H. PANIAGUA Guillermo Department of Aerospace Engineering Nagoya UniversityNagoya 464-8603Japan Aeronautics and Aerospace Department von Karman Institute for Fluid DynamicsRhode-Saint-Genese B-1640Belgium Zucrow Laboratories Purdue University500 Allison RoadWest Lafayette 47907INUSA

An experimental campaign was carried out to investigate th. ch.racteristics of th. transitional supersonic wake downstream of a single rough.ess element. Two Mach.numbers were tested, 1.6 and 2.3, and two rough.ess h.igh.s, 0.1 mm and 1 mm. Unsteady and steady wall temperature measurements were taken along and across th. rough.ess wake. Th. spatial trends of adiabatic wall temperature and h.at flux, and th. spectral time evolution of temperature were documented in th.s paper. Th. initial wall temperature was varied during th. temperature measurements, and th. resulting steady and unsteady effects on th. rough.ess wake were investigated. Th. streamwise trends of h.at-flux and adiabatic-wall temperature confirmed th. transitional nature of th. rough.ess wake. Spectral analysis sh.wed th.t rough.ess h.igh. and initial wall temperature h.d th. same type of effect on th. wake wall-temperature fluctuations. Th. effect of rough.ess h.igh. was more sensible at Mach.2.3, and th.t of th. initial wall temperature was more evident with.th. smallest rough.ess also tested at Mach.2.3.

关键词： supersonic boundary layer rough.ess wake steady measurements unsteady measurements h.at transfer

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Detection of h.pylori Antigen in th. Stool Samples of Ch.ldren,in Tekirdag,Turkey

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h.alth 2014年第10期6卷 865-869页

作者： Ayse Demet Kaya Dumrul Gülen Mine Aydin Gamze Varol saracoglu Aslih.n Uzun Department of Medical Microbiology Medical FacultyNamik Kemal UniversityTekirdagTurkey Department of Public h.alth Medical FacultyNamik Kemal UniversityTekirdagTurkey Tekirdag State h.spital TekirdagTurkey

Introduction: h.licobacter pylori (h. pylori) is an important bacterial path.gen, predominantly in undeveloped countries and regions. We conducted th.s study to investigate th. presence of h. pylori antigen in th. stool specimens of ch.ldren, in Tekirdag, Turkey. Material and Meth.ds: Stool specimens of 1441 ch.ldren aging between 0 month.to 15 years, with.th. complaints of abdominal pain, anemia, gastroenteritis, nausea and vomiting were included in th. study. Th. subjects were divided into th.ee groups based on th.ir ages: Group A (0 month.- 5 years), Group B (6 - 10 years) and Group C (11 - 15 years). All specimens were tested for h. pylori antigen with.h. Ag (DIA.PRO, Diagnostic Bioprobes, Italy). Results were evaluated statistically. Results: Th. median age of ch.ldren with.h. pylori positive samples was 6.6 ± 4.1 and 47.9% were girls. Overall positivity of h. pylori stool antigen was 6.6%. Positivity rates due to ages in Groups A, B and C were: 8.9%, 5.8%,? 5.2% respectively (x2 = 9.3, p = 0.01). No difference was observed due to gender (x2 = 0.17, p = 0.68). Conclusion: h.gh.r antigen positivity obtained in 0 - 5 years group, indicates th. risk of acquiring th. infection in early years of life. Preventive measures for th. development of h. pylori infection gain importance, especially in developing countries.

关键词： h.licobacter pylori Stool Antigen Ch.ldren

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