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Flexible thermoelectric generator with liquid metal interconnects and low thermal conductivity silicone filler

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npj Flexible Electronics 2021年第1期5卷 25-36页

作者： Viswanath Padmanabhan Ramesh Yasaman Sargolzaeiaval Taylor Neumann Veena Misra Daryoosh Vashaee Michael D.Dickey Mehmet C.ozturk Department of Electrical and Computer Engineering NC State UniversityRaleighNCUSA Department of Chemical and Biomolecular Engineering NC State UniversityRaleighNCUSA

Harvesting body heat using thermoelectricity provides a promising path to realizing self-powered,wearable electronics that can achieve continuous,long-term,uninterrupted health *** paper reports a flexible thermoelectric generator(TEG)that provides efficient conversion of body heat to electrical *** device relies on a low thermal conductivity aerogel–silicone composite that secures and thermally isolates the individual semiconductor elements that are connected in series using stretchable eutectic gallium-indium(EGaIn)liquid metal *** composite consists of aerogel particulates mixed into polydimethylsiloxane(PDMS)providing as much as 50%reduction in the thermal conductivity of the silicone *** on the wrist,the flexible TEGs present output power density figures approaching 35μWcm^(−2)at an air velocity of 1.2 ms^(−1),equivalent to walking *** results suggest that these flexible TEGs can serve as the main energy source for low-power wearable electronics.

关键词： wear conductivity generator

One-year experience in the retinopathy of prematurity: frequency and risk factors, short-term results and follow-up

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International Journal of Ophthalmology(English edition) 2011年第6期4卷 634-640页

作者： Sariaydin Mehmet Atlihan Fusun Calkavur Sebnem Olukman Ozgur Ercan Gulten ozturk Arif Taylan Kaya Kilic Fatma Gokaslan Filiz Altinyaprak Derya Malatyali Rana Department of Neonatology Trabzon Medical Faculty Department of Neonatology Dr. Behet Uz Children's Hospital Department of Ophthalmology Dr. Behet Uz Children's Hospital

· AIM: As a result of the increase in premature births and the advances in neonatal intensive care, retinopathy of prematurity (ROP) remains one of the most important causes of childhood blindness worldwide. The main factors in the development of ROP are gestational age, birth weight and oxygen therapy. ROP continues to gain importance due to the increasing survival rates of more immature babies. · METHODS: Between January 2007 and October 2008, 203 premature infants treated at the Neonatal Intensive Care Unit (NNICU) were prospectively enrolled and the relationship between known risk factors and the occurance of ROP was studied. · RESULTS: ROP in various stages developed in 86 cases (42.4%). Statistically significant correlations were found between the development of ROP and birth weight (P < 0.0001) gestational age (P <0.0001), oxygen treatment and its duration (P <0.0001 and P =0.002), mechanical ventilation (MV) and its duration (P =0,0001 and P =0.0001), apnea(P = 0.001), intraventricular hemorrhage (IVH) (P =0.046), sepsis (P =0.0001), use of erythropoietin (EPO) (P =0.003), the number of blood transfusions and frequency (P =0.0001 and P =0.0001), surfactant application (P =0.0001), the presence of patent ductus arteriosus (PDA) (P =0.001) or bronchopu- lmonary dysplasia (BPD) (P =0.0001). No significant correlations were found between the occurance of ROP and maternal pre-eclampsia (P =0.293), multiple pregnancy (P = 0.218), or hyperbilirubinemia (P =0.494). Severity of ROP was related significantly with birth weight (P =0.0001), but no significant correlation between severity of ROP and gestational age was present. · CONCLUSION: Early description and reduction of the risk factors related with the occurance of ROP with the help of routine screening programs may warrant the prevention of visual loss, however early ophthalmic diagnosis and treatment are still mandatory to provide better visual rehabilitation. ·

关键词： prematurity retinopathy risk factors gestational age birth weight oxygen therapy

Effects of daily telephone-based re-education before taking medicine on Helicobacter pylori eradication

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World Journal of Gastroenterology 2016年第15期22卷 4071-4072页

作者： Hakan Demirci Kadir ozturk Omer Kurt Department of Gastroenterology Gulhane Military Medical Academy 06010 Ankara Turkey

We read the article "Effects of daily telephone-based re-education before taking medicine on Helicobacter pylori(H. pylori) eradication: A prospective singlecenter study from China" written by Wang et al with great interest. It is reported in American and European guidelines that there is no sufficient test for the diagnosis of H. pylori except culture and that using at least two different tests for diagnosis of H. pylori is recommended. Patients who used antibiotics or bismuth salts in the previous 2 wk were excluded from study. But patients who used probiotics and antioxidant vitamins such as vitamins C and E were not excluded.

关键词： Helicobacter pylori Erdication rates Telephone based education

Corneal properties in children with congenital isolated growth hormone deficiency

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International Journal of Ophthalmology(English edition) 2014年第2期7卷 317-320页

作者： Pinar Nalcacioglu-Yuksekkaya Emine Sen Ufuk Elgin Mumin Hocaoglu Faruk ozturk Sebahat Agladioglu Yilmaz Havva Nur Kendirci Semra etinkaya Zehra Aycan Department of Pediatric Ophthalmology Dr Sami Ulus Children's Health and Disease Training and Research Hospital Ulucanlar Eye Research Hospital Department of Pediatric Endocrinology Dr Sami Ulus Children's Health and Disease Training and Research Hospital

AIM:To compare the corneal parameters of children with congenital isolated growth hormone deficiency and healthy ***:In this cross-sectional,prospective study,50 cases with growth hormone(GH)deficiency treated with recombinant GH and 71 healthy children underwent a complete ophthalmic *** corneal hysteresis(CH),corneal resistance factor(CRF),Goldmann-correlated intraocular pressure(IOPg)and corneal-compensated intraocular pressure(IOPcc)were measured with the Ocular Response Analyzer(ORA).Central corneal thickness(CCT)was measured by a ultrasonic ***:The mean age was 13.0±3.0 years in the GH deficiency group consisting of 21 females and 29 males and 13.4±2.4 years in the healthy children group consisting of 41 females and 30 *** was no statistically significant difference between the groups for gender or age(Chi-square test,P=0.09;independent ttest,P=0.28,respectively).The mean duration of recombinant GH therapy was 3.8±2.4y in the study *** mean CH,CRF,IOPg and IOPcc values were 11.0±2.0,10.9±1.9,15.1±3.3,and 15.1±3.2 mm Hg respectively in the study *** same values were 10.7±1.7,10.5±1.7,15.2±3.3,and 15.3±3.4 mm Hg respectively in the control *** mean CCT values were 555.7±40.6,545.1±32.5μm in the study and control groups *** was no statistically significant difference between the two groups for CH,CRF,IOPg,IOPcc measurements or CCT values(independent t-test,P=0.315,0.286,0.145,0.747,0.13 respectively).CONCLUSION:Our study suggests that GH deficiency does not have an effect on the corneal parameters and CCT *** observation could be because of the duration between the beginning of disease and the diagnosis and beginning of GH therapy.

关键词： child corneal biomechanical parameters central corneal thickness growth hormone deficiency

Validation of the PAGE-B score to predict hepatocellular carcinoma risk in caucasian chronic hepatitis B patients on treatment

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World Journal of Gastroenterology 2022年第6期28卷 665-674页

作者： Pinar Gokcen Fatih Guzelbulut Gupse Adali Ayca Gokce Degirmenci Salturk Oguzhan ozturk Ozgur Bahadir Emine Kanatsiz Mevlut Kiyak Kamil Ozdil Hamdi Levent Doganay Department of Gastroenterology Health Sciences UniversityUmraniye Teaching and Research HospitalIstanbul 34764Turkey Department of Gastroenterology Health Sciences UniversityHaydarpasa Numune Teaching and Research HospitalIstanbul 34668Turkey

BACKGROUND Several risk scores have been developed to predict hepatocellular carcinoma(HCC)risk in chronic hepatitis B(CHB)*** majority of risk scores are based on pretreatment variables that are no longer considered risk factors for HCC development due to the suppression of hepatitis B virus replication early in the course of potent antiviral treatment in most *** PAGE-B score,which is based on platelet levels,age and sex,has been shown to accurately predict HCC risk in CHB patients on antiviral treatment in various *** We aimed to evaluate the PAGE-B score in predicting HCC risk in Turkish CHB patients on antiviral *** In this study,we recruited 742 CHB patients who had been treated with tenofovir disoproxil fumarate or entecavir for≥1 *** groups were determined according to the PAGE-B scores as follows:≤9,low;10-17,moderate and≥18,*** cumulative HCC incidences in each risk group were computed using Kaplan-Meier analysis and were compared using the log-rank *** accuracy of the PAGE-B score in predicting HCC risk was evaluated using a timedependent area under the receiver operating characteristic(AUROC)curve at all study time *** and multivariate logistic regression analyses were used to assess the risk factors for HCC *** The mean follow-up time was 54.7±1.2 *** was diagnosed in 26 patients(3.5%).The cumulative HCC incidences at 1,3,5 and 10 years were 0%,0%,0%and 0.4%in the PAGE-B low-risk group;0%,1.2%,1.5%and 2.1%in the PAGE-B moderate-risk group;and 5%,11.7%,12.5%,and 15%in the PAGE-B high-risk group,respectively(log-rank P<0.001).The AUROCs of the PAGE-B score in the prediction of HCC development at 1,3,5 and 10 years were 0.977,0.903,0.903 and 0.865,*** the multivariable analysis,older age,male sex,lower platelet levels,presence of cirrhosis,and absence of alanine aminotransferase normalization at month 6 were associated with HCC development(all P<0.05).C

关键词： Chronic hepatitis B Hepatocellular carcinoma PAGE-B score Surveillance

Common telomerase reverse transcriptase promoter mutations in hepatocellular carcinomas from different geographical locations

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World Journal of Gastroenterology 2015年第1期21卷 311-317页

作者： Dilek Cevik Gokhan Yildiz Mehmet ozturk BilG en Genetics and Biotechnology Center Department of Molecular Biology and GeneticsBilkent UniversityAnkara 06800Turkey Centre de Recherche Inserm-Université Joseph Fourrier U823 La Tronche 38706France Advanced Biomedical Research Center Dokuz Eylul UniversityIzmir 35340Turke

AIM: To determine the mutation status of human telomerase reverse transcriptase gene(TERT) promoter region in hepatocellular carcinoma(HCC) from different geographical ***: We analyzed the genomic DNA sequences of 59 HCC samples comprising 15 cell lines and 44 primary tumors,collected from patients living in Asia,Europe and *** amplified a 474 bp DNA fragment of the promoter region of TERT gene including the 1295228 and 1295250 sequence of chromosome 5 by using *** were then sequenced by Sanger technique and the sequence data were analyzed with by using DNADynamo software in comparison with wild type TERT gene sequence as a ***: The TERT mutations were found highly frequent in *** of the fifteen tested cell lines displayed C228 T mutation,and one had C250 T mutation with a mutation frequency up to 60%.All of the mutations were heterozygous and mutually *** out of forty-four tumors displayed C228 T mutation,and additional five tumors had C250 T mutation providing evidence for mutation frequency of 34% in primary *** the geographic origins of HCC tumors tested,TERT promoter mutation frequencies were higher in African(53%),when compared to non-African(24%) tumors(P = 0.056).There was also a weak inverse correlation between TERT promoter mutations and murine double minute 2 single nucleotide polymorphism 309 TG polymorphism(P = 0.058).Mutation frequency was nearly two times higher in established HCC celllines(60%) compared to the primary tumors(34%).CONCLUSION: TERT promoter is one of most frequent mutational targets in liver cancer,and hepatocellular carcinogenesis is highly associated with the loss of telomere-dependent cellular senescence control.

关键词： Hepatocellular carcinoma Liver cancer Telomerase r

Transient Exergy Analysis of the Condenser and Evaporator of an Air Source Heat Pump Water Heater

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Journal of Mechanics Engineering and Automation 2016年第7期6卷 339-347页

作者： Mehmet Mete ozturk L. Berrin Erbay Transportation Vocational Sch. Anadolu University Eskisehir Turkey School of Eng.and Arch. Eskt'sehir Osmangazi University 26480 Ban Meselik Eskisehir Turkey

In this study the performance of an ASHPWH （air source heat pump water heater） is assessed from exergy point of view in component wise. In order to investigate the work potential of energy, the destruction on the exergy is analyzed and results are summarized for the components individually. The exergy destruction of the system is studied by considering real paths of the pressure and temperature data which are collected during the experiments of the ASHPWH under varying environmental conditions. In the following step, the evolution of the exergy destruction of the system is calculated by a code which is compiled on MATLAB along these temperature and pressure paths. The obtained results reveal the importance of the transient exergy analysis by providing detailed information about exergy destruction of the system such as where it drives up and reaches up to its max and where it drops down and evolves on a smooth path.

关键词： Transient exergy analysis heat pump condenser evaporator.

The Effect of the Grinding Time on the Mechanical Activation of MnO2 Ore and Tea Plant Waste Carbonization Product

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Journal of Physical Science and Application 2017年第4期7卷 59-65页

作者： Mustafa BOYRAZLI Elif ARANCI ozturk Yunus Emre BENKLI Department of Metallurgy andMaterials Engineering Faculty of Engineering Firat University Elaig 23119 Turkey Department of Metallurgy and Materials Engineering Faculty of Engineering Atatiirk University Erzurum 25240 Turkey

In this study, pyrolusiteore （MnO2） was subjected to mechanical milling with a high-energy mill with carbonized tea plant wastes and the effect of grinding time on the crystal structure of the material was investigated. The ratio of Mn/Fe was 8/1, the ratio of C/（MnO2 ＋ Fe3O4） was 2 and the ratio of ball to ore was 10/1. The samples were mechanically ground at 10, 15, 20, 30, 60, 90 and 120 hours. In the processes performed on the attritor, the rotation speed of the mill shaft was determined to be 350 rpm. The results were characterized by TG-DTA, SEM and XRD analyzes. As a result of the experimental studies, it was observed that the samples subjected to mechanical grinding for 120 hours were gradually reduced due to the increasing grinding time at all the diffraction peaks when the XRD peaks were compared with the grinding times. In the thermogravimetric analysis, the sample milled for 120 hours, 50% weight loss was observed at 470 ℃, weight loss of up to 56% was observed at progressive temperatures.

关键词： Tea plant wastes carbonization mechanical grinding pyrolusite ore.

Cem Ayakkabi Sanayi ve Ticaret Ltd.的电子零售扩张的深度探讨

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Cem Ayakkabi Sanayi ve Ticaret Ltd.的电子零售扩张的深度探讨

作者： ozturk Hüsamettin Emre 复旦大学

学位级别：硕士

在这项论文中,一家在伊斯坦布尔,土耳其的鞋类制造商公司,“Cem AyakkabiSanayi ve Ticaret Ltd.”计划利用在网上以新的本地品牌来零售外包产品来扩大公司现有的业务。文章里讨论的现前的土耳其和中国市场条件的资料源自于官方渠道的... 详细信息

在这项论文中,一家在伊斯坦布尔,土耳其的鞋类制造商公司,“Cem AyakkabiSanayi ve Ticaret Ltd.”计划利用在网上以新的本地品牌来零售外包产品来扩大公司现有的业务。文章里讨论的现前的土耳其和中国市场条件的资料源自于官方渠道的一些期刊文章和一些统计数据。在土耳其的竞争市场研究源自于“竞争对手阵列”的100人的问卷调查。新产品的价值定位源自于这个调查结果。为了得到一个适当的目标群体的结果,我们采取了另一项问卷调查。这个调查适用了三个包括人口,登山鞋的使用信息和对登山鞋的观念的主要部分。问卷调查有100人参加。我们检验了调查研究得出的结果和我们觉定了从问卷调查中得到的目标群体的定义。为了估计新品牌的市场份额潜力,我们根据问卷调查,价格,收入,消费和期望建立及命名了“市场份额的力量衡度”。一个基于产品特性及市场特性的模型利用了这些因素估计一个健康的市场份额。在营销战略中我们进行了讨论4项计划:产品战略,促销战略,分销战略和价格战略。最后,有关的法律问题,我们讨论了这一扩张计划的财务状况和风险评估。

关键词：电子零售扩张 Cem Ayakkabi 土耳其