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In vivo corneal confocal microscopic analysis in patients with keratoconus

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International Journal of Ophthalmology(English edition) 2015年第3期8卷 534-539页

作者： Gulfidan Bitirgen ahmet Ozkagnici Banu Bozkurt Rayaz A Malik Department of Ophthalmology Necmettin Erbakan University Meram Faculty of Medicine Department of Ophthalmology Selcuk University Faculty of Medicine Centre for Endocrinology and Diabetes University of Manchester

AIM: To quantify corneal ultrastructure using laser scanning in vivo confocal microscopy(IVCM) in patients with keratoconus and control subjects. METHODS: Unscarred corneas of 78 keratoconic subjects without a history of contact lens use and 36age-matched control subjects were evaluated with slit-lamp examination(SLE), corneal topography and laser scanning IVCM. One eye was randomly chosen for analysis. Anterior and posterior stromal keratocyte,endothelial cell and basal epithelial cell densities and sub-basal nerve structure were ***: IVCM qualitatively demonstrated enlarged basal epithelial cells, structural changes in sub-basal and stromal nerve fibers, abnormal stromal keratocytes and keratocyte nuclei, and pleomorphism and enlargement of endothelial cells. Compared with control subjects, significant reductions in basal epithelial cell density( 5817 ± 306 cells / mm2 vs 4802 ±508 cells/mm2,P < 0. 001), anterior stromal keratocyte density(800 ±111 cells/mm2 vs 555 ±115 cells/mm2, P <0.001),posterior stromal keratocyte density(333±34 cells/mm2vs270 ±47 cells/mm2, P <0.001), endothelial cell density(2875 ±223 cells/mm2 vs 2686 ±265 cells/mm2, P <0.001),sub-basal nerve fiber density(31.2 ±8.4 nerves/mm2vs18.1 ±9.2 nerves/mm2, P <0.001), sub-basal nerve fiber length(21.4±3.4 mm/mm2 vs 16.1±5.1 mm/mm2, P <0.001),and sub-basal nerve branch density(median 50.0(first quartile 31.2- third quartile 68.7) nerve branches/mm2 vs median 25.0(first quartile 6.2- third quartile 45.3) nerve branches/mm2, P <0.001) were observed in patients with ***: Significant microstructural abnormalities were identified in all corneal layers in the eyes of subjects with keratoconus using IVCM. This non-invasive in vivo technique provides an important means to define and follow progress of microstructural changes in patients with keratoconus.

关键词： keratoconus in vivo confocal microscopy corneal nerves

Examination of Element Concentrations in Groundwater by ICP-MS for Monitoring of Pre-Earthquake Activities

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光谱学与光谱分析 2013年第1期33卷 1-6页

作者： Mehmet Yaman ahmet Sasmaz Firat University Sciences FacultyDepartment of ChemistryElazigTurkey Firat University Engineering FacultyDepartment of GeologyElazigTurkey

This study presents the results of hydrogeochemical studies carried out in Zeytun thermal springs in Kahramanmaras,located South Middle *** than 90thermal water samples were collected on a regular basis from 2006to 2008to measure element concentrations as a monitor of earthquake *** samples were analyzed using *** observed B,Ba,Br and Ge concentrations for 16months are in ranges of 79～422,103～167,28～93and 0.3～1.2 μ g.L-1,*** concentrations for these periods are in range of 7～*** data identify some element anomalies before *** anomalies are characterized by decreases up to 158%in Ba and Cl *** occurrence of these anomalies can be attributed to stress / strain induced pressure changes in the subsurface water *** can be suggested that the thermal springs in the fault line area are ideal sites for precursors of earthquakes.

关键词： Earthquake Groundwater Elements Precursory ICP-MS

Effects of maturity stages on textural mechanical properties of tomato

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International Journal of Agricultural and Biological Engineering 2016年第6期9卷 200-206页

作者： ahmet Ince Melih Yavuz Cevik Kubilay Kazim Vursavus Dept.of Agricultural Machinery and Technologies Engineering Faculty of AgricultureÇukurova University01330AdanaTurkey

The textural mechanical properties of Jadelo F1 variety tomato were evaluated at three different mature stages(green,pink and red)which were classified according to the colors of the *** compression and the puncture tests were applied on *** cycling and relaxation tests showed that indexes of average firmness,energy absorption and deformation ratio were more sensitive parameters to maturity stages than *** puncture tests indicated that maturity stages were effective on initial and average firmness and skin rupture *** the rigidity and the firmness of the fruit reduced,it was more prone to mechanical damage in the process of *** initial firmness values obtained fromcompressiontest and average firmness values from puncture tests had the highest correlation with each other which indicates that they can be used as representative parameter for ***,it was found that a/b color parameter can be good indicator for evaluating mechanical properties of tomato.

关键词： maturity textural properties mechanical properties color

Development of a GIS-based failure investigation system for highway soil slopes

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Frontiers of Earth Science 2015年第2期9卷 165-178页

作者： Raghav RAMANATHAN ahmet H. AYDILEK Burak F. TANYU Paul C. Rizzo Associates Inc. 500 Penn Center Blvd. Pittsburgh PA 15235 USA Department of Civil and Environmental Engineering University of Maryland MD 20742 USA Department of Civil Environmental and Infrastructure Engineenng George Mason University Fairfax VA 22030 USA

A framework for preparation of an early warning system was developed for Maryland, using a GIS database and a collective overlay of maps that highlight highway slopes susceptible to soil slides or slope failures in advance through spatial and statistical analysis. Data for existing soil slope failures was collected from geotechnical reports and field visits. A total of 48 slope failures were recorded and analyzed. Six factors, including event precipitation, geological formation, land cover, slope history, slope angle, and elevation were considered to affect highway soil siope stability. The observed trends indicate that precipitation and poor surface or subsurface drainage conditions are principal factors causing slope failures. 96% of the failed slopes have an open drainage section. A majority of the failed slopes lie in regions with relatively high event precipitation （P 〉 200 mm）. 90% of the existing failures are surficial erosion type failures, and only 1 out of the 42 slope failures is deep rotational type failure. More than half of the analyzed slope failures have occurred in regions having low density land cover. 46% of failures are on slopes with slope angles between 20~ and 30~. Influx of more data relating to failed slopes should give rise to more trends, and thus the developed slope management system will aid the state highway engineers in prudential budget allocation and prioritizing different remediation projects based on the literature reviewed on the principles, concepts, techniques, and methodology for slope instability evaluation （Lesh- chinsky et al., 2015）.

关键词： soil slope slope management system geo-graphic information system hazard mapping

Rumeli fortress from the perspective of architecture history

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Frontiers of Architectural Research 2013年第4期2卷 409-419页

作者： Mehmet Cercis Erismis ahmet Ozan Gezerman Faculty of Architecture Department of Architecture Yildiz Technical University Istanbul 34220 Turkey Faculty of Chemical-Metallurgical Engineering Department of Chemical Engineering Yildiz Technical University Istanbul 34220 Turkey

The Rumeli Fortress has a unique place in world history. This study presents information on the castle and Fatih period, explains the aspects of castle thought to be important, and discusses the gradually ruined areas... 详细信息

关键词： Architectural research History research method Scientific research Bogazkesen Rumeti Fortress Restoration

Anisotropy effect on strengths of metamorphic rocks

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第1期10卷 164-175页

作者： ahmet ?zbek Murat Gül Ergun Karacan Ovünc Alca Department of Geological Engineering Kahramanmaras Sutcu Imam UniversityAvsar CampusKahramanmarasTurkey Department of Geological Engineering Mugla Sltkl Kocman UniversityMuglaTurkey

This paper aims to study the effect of anisotropy on strengths of several metamorphic rocks of southern(Cine) submassif of Menderes metamorphic massif in southwest Turkey. Four different metamorphic rocks including foliated phyllite, schist, gneiss and marble(calcschist) were selected and *** surveys were made along lines for each rock and evaluated with DIPS program. L-type Schmidt hammer was applied in the directions parallel and perpendicular to foliation during the field study. Several hand samples and rock blocks were collected during the field study for measurements of dry and saturated densities, dry and saturated unit weights and porosity, and for petrographic analysis and strength determination in laboratory. L-and N-type Schmidt hammers were applied in the directions perpendicular(anisotropy angle of 0°) and parallel(anisotropy angle of 90) to the foliation on selected blocks of phyllite, schist, gneiss and marble(calcschist). The phyllite and schist have higher porosity and lower density values than the other rocks. However, coarse crystalline gneiss and marble(calcschist) have higher rebound values and strengths, and they are classified as strong-very strong rocks. Generally, the rebound values in the direction perpendicular to the foliation are slightly higher than that in the direction parallel to foliation. Rebound values of N-type Schmidt hammer are higher than the L-type values except for phyllite. Sometimes, the rebound values of laboratory and field applications gave different results. This may result from variable local conditions such as minerals differentiation,discontinuities, water content, weathering degree and thickness of foliated structure.

关键词： Rock anisotropy Field survey Schmidt hammer rebound values Southwest Turkey

Minimally invasive techniques in benign and malignant adrenal tumors

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World Journal of Clinical Cases 2022年第35期10卷 12812-12821页

作者： ahmet Bulent Dogrul Omer Cennet Anıl Hilmi Dincer Department of General Surgery Hacettepe University Faculty of MedicineHacettepe UniversityAnkara 06100Turkey

Minimally invasive adrenalectomy has become the main treatment modality for most adrenal *** laparoscopic transabdominal and retroperitoneoscopic approaches are safe and feasible options,each with respective advantages,including better surgical outcomes,fewer complications,and faster recovery over open *** open surgery remains a valid modality in treatment of adrenocortical cancer in the presence of some findings such as invasion,robotic platforms,and minimally invasive surgery have gained popularity as technology continues to *** preservation during adrenalectomy is feasible in some conditions to prevent adrenal *** technologies are increasingly utilized in benign and malignant tumors,including the adrenal gland,with various outcomes.A multidisciplinary team,an experienced surgeon,and a highvolume center are recommended for any surgical approaches and management of adrenal *** review article evaluated recent findings and current evidence on minimally invasive adrenalectomy.

关键词： Adrenalectomy Laparoscopy Retroperitoneoscopic Minimally invasive surgery Robotic

Detecting treeline dynamics in response to climate warming using forest stand maps and Landsat data in a temperate forest

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Forest Ecosystems 2018年第3期5卷 311-324页

作者： Maliheh Arekhi ahmet Yesil Ulas Yunus Ozkan Fusun Balik Sanli Institutes of Graduate Studies in Science and Enclineering Forest Ena neer haIstanbul University34452 IstanbulTurkey Faculty of Forestry Department or Forest ManagementIstanbul University34473 IstanbulTurkey Faculty of Civil Engineering Department of Geomatic EngineeringYlldlz Technical University34220 IstanbulTurkey

Background: Treeline dynamics have inevitable impacts on the forest treeline structure and composition. The present research sought to estimate treeline movement and structural shifts in response to recent warming in Cehennemdere, Turkey. After implementing an atmospheric correction, the geo-shifting of images was performed to match images together for a per pixel trend analysis. We developed a new approach based on the NDVI, LST(land surface temperature) data, air temperature data, and forest stand maps for a 43-year period. The forest treeline border was mapped on the forest stand maps for 1970, 1992, 2002, and 2013 to identify shifts in the treeline altitudes, and then profile statistics were calculated for each period. Twenty sample plots(10 × 10 pixels) were selected to estimatethe NDVI and LST shifts across the forest timberline using per-pixel trend analysis and non-parametric Spearman’s correlation analysis. In addition, the spatial and temporal shifts in treeline tree species were computed within the selected plots for four time periods on the forest stand maps to determine the pioneer tree ***: A statistically significant increasing trend in all climate variables was observed, with the highest slopein the monthly average mean July temperature(tau = 0.62, ρ < 0.00). The resultant forest stand maps showed a geographical expansion of the treeline in both the highest altitudes(22 m–45 m) and the lowest altitudes(20 m–105 m) from 1970 to 2013. The per pixel trend analysis indicated an increasing trend in the NDVI and LST values within the selected plots. Moreover, increases in the LST were highly correlated with increases in the NDVIbetween 1984 and 2017(r = 0.75, ρ < 0.05). Cedrus libani and Juniperus communis app. were two pioneer tree species that expanded and grew consistently on open lands, primarily on rocks and soil-covered areas, from 1970 to ***: The present study il ustrated that forest treeline dynamics and treeline structural

关键词： NDVI Geoshift LST Timberline Mann-Kendall Landsat Climate warming

Sensitivity Analysis of COVID-19 in Mediterranean Island

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Computer Modeling in Engineering & Sciences 2022年第1期130卷 133-148页

作者： ahmet Savasan Bilgen Kaymakamzade Nezihal Gokbulut Evren Hincal Elcin Yoldascan Near East University Faculty of Arts and SciencesNicosia99138North Cyprus Near East University Mathematics Research CenterNicosia99138North Cyprus Cyprus International University Faculty of MedicineNicosia99138North Cyprus

The aim of this study is to examine the progress of the worldwide pandemic *** authors,we have decided to analyze the situation of COVID-19 onMediterranean islandwith accurate *** this purpose,amathematical model is constructed and proposed by dividing the whole population into sensible and suitable *** study captures the dates February 01 till May 15,*** the control of the spread of disease,vaccination and infection rates are compared and *** calculations and comparison,MatLab software is *** of the data that are used are taken from the Ministry of *** effect of parameters is examined with sensitivity ***,with this analysis,values of parameters are ***,by using the constructed model,the effect of vaccine on infected individuals is analyzed *** a result,it is concluded that the studied part of the island is late for the control of the disease via *** can be explained by two main reasons;vaccinating the people that are not inmobilitymost of the time(aged people and people with chronic diseases)and getting the vaccine ***,the results showed that this rate and distribution of vaccines would not be enough to control the pandemic on the island.

关键词： COVID-19 vaccination mathematical model basic reproduction number island sensitivity analysis