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Chinese Medical Journal 2011年第10期124卷 1600-1600页

作者： Adnan Taş erdem koçak erdem akbal Seyfettin Köklü Department of Gastroenterology Ankara Education and Research Hospital Ankara Turkey）

To the editor： Hepatitis C virus （HCV） is a hepatotropic virus and a common cause of chronic hepatitis. Several extrahepatic complications have been associated with HCV including autoimmune and kidney diseases. It ... 详细信息

关键词： glomerulonephritis hepatitis C virus interferon and ribavirin MPGN mixed cryoglobulinemia

Brain age estimation:premise,promise,and problems

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Neural Regeneration Research 2025年第8期20卷 2313-2314页

作者： Jarrad Perron Ji Hyun ko Graduate Program in Biomedical Engineering Price Faculty of EngineeringUniversity of ManitobaWinnipegMBCanada PrairieNeuro Research Centre Kleysen Institute for Advanced MedicineHealth Sciences CentreWinnipegMBCanada Department of Human Anatomy and Cell Science Rady Faculty of Health SciencesUniversity of ManitobaWinnipegMBCanada

Premise:The com bined effects of modern healthcare practices which prolong lifespan and declining birthrates have created unprecedented changes in age demographics worldwide that are especially pronounced in Japan,South korea,Europe,and North *** old age is the most significant predictor of dementia,global healthcare systems must rise to the challenge of providing care for those with neurodegenerative disorders.

关键词： estimation providing birth

Approximate solutions of Schrdinger equation for Eckart potential with centrifugal term

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Chinese Physics B 2010年第9期19卷 155-160页

作者： F. Taskin G. koak Department of Physics Erciyes University

The approximate analytical solutions of the Schrodinger equation for the Eckart potential are presented for the arbitrary angular momentum by using a new approximation of the centrifugal term. The energy eigenvalues and the corresponding wavefunctions are obtained for different values of screening parameter. The numerical examples are presented and the results are in good agreement with the values in the literature. Three special cases, i.e., s-wave, ξ= λ=1, and β=0, are investigated.

关键词： Schrodinger equation Eckart potential bound state

Seed Priming with MgCl_(2),CaCl_(2),and ZnCl_(2) as a Biofortification Based-Approach Induces Changes in Anise Seedlings Emergence

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Phyton-International Journal of Experimental Botany 2023年第8期92卷 2461-2471页

作者： Sibel Day Nilüfer koçak-Şahin Department of Field Crops Faculty of AgricultureAnkara UniversityAnkara06110Türkiye

Aromatic and medicinal plant species having small seeds haveﬁeld emergence problems due to low nutrient ***,Pimpinella anisum seeds were hydro and osmoprimed with 100 mM MgCl_(2),CaCl_(2),and ZnCl_(2),for 2,4,and 8 h each to compare their growth attributes during germination and seedling establishment *** seeds were used as *** hydro and osmo primed seeds were dried for 48 h before,they were sown in plastic trays in growth room conditions to see the impact of treatments on seedling emergence and *** maximum root length(12.90 cm),fresh weight(256.30 mg plant^(-1)),and mean emergence time(MET)were recorded from 8 h MgCl_(2) primed ***,the maximum(97.50,and 98.00%)emergence percentage was observed using 8 h MgCl_(2) primed seeds and nontreated seeds(control treatment).The evaluation of parameters like chlorophyll contents and electrical conductivity showed the 8 h MgCl_(2) priming as the optimum *** evaluation of parameters like chlorophyll contents and electrical conductivity showed the 8 h MgCl_(2) priming as the optimum *** result suggests MgCl_(2) priming worked synergistically and improved seed-ling growth attributes under greenhouse *** chlorophyll content ranged 25.94–35.69 SPAD *** highest chlorophyll content was obtained from the seedlings obtained from 4 h CaCl_(2) treatment,which were statistically similar to the chlorophyll contents of the seedlings obtained after 8 h MgCl_(2) treatment and nontreated seeds(control treatment).All other treatments showed inhibition in the chlorophyll contents and growth attributes of the *** conclusion,MgCl_(2) osmopriming treatments were signiﬁcantly promotive and better compared to hydro-priming and osmopriming treatments including control treatment in terms of anise seeds germination and emergence.

关键词： Pimpinella anisum L seed treatment hydropriming osmopriming electrolytes leakage

Characterization of Cu–Ti powder metallurgical materials

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International Journal of Minerals,Metallurgy and Materials 2017年第1期24卷 83-90页

作者： erdem Karakulak Metallurgical and Materials Engineering Department Kocaeli UniversityKocaeli 41380Turkey

Powder metallurgical Cu-Ti alloys with different titanium additions produced by hot pressing were characterized by optical microscopy, scanning electron microscopy, X-ray diffraction analysis, and hardness, wear and bending tests. The addition of titanium to copper caused the formation of different intermetallic layers around titanium particles. The titanium content of the intermetallics decreased from the center of the particle to the copper matrix. The hardness, wear resistance, and bending strength of the materials increased with increasing Ti content, whereas strain in the bending test decreased. Worn surface analyses showed that different wear mechanisms were active during the wear test of specimens with different chemical compositions. Changes in the properties of the materials with titanium addition were explained by the high hardness of different Cu-Ti intermetallic phases.

关键词： copper titanium alloys powder metallurgy sintering mechanical properties wear

A review:Past,present and future of grain refining of magnesium castings

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Journal of Magnesium and Alloys 2019年第3期7卷 355-369页

作者： erdem Karakulak BCAST Brunei University LondonUxbridgeMiddlesex UB83PHUK

Magnesium is the lightest constructional metal,which makes it an important material for different applications like automotive,transportation,aviation and *** are several studies about developing properties of existing Mg alloys and introducing new alloy systems to industrial *** important way to improve properties of metallic materials is to decrease grain size that results almost in increasing all kind of properties of the *** review paper aims to summarize the literature about grain refining of magnesium *** text is consisting of three sections,which focused on the(1)grain refining methods used in the past,which are not used today,(2)grain refining methods currently being used in the industry and(3)novel and newly developed methods that may find usage in the industry in *** explaining grain refining methods of magnesium alloys a general summary about grain refinement of metals is also provided.

关键词： Magnesium Casting Grain refining Grain size.

Petrogenesis of the ükapili Granitoid and its Mafic Enclaves in Elmal Area (Nigde, Central Anatolia, Turkey)

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Acta Geologica Sinica(English Edition) 2013年第3期87卷 738-748页

作者： Hüseyin KURT Kerim koak Kürsad ASAN Mustafa KARakAS Department of Geological Engineering Seluk University Central Anatolia Directorate of Mineral Research and Exploration

The Late Cretaceous Uckapth Granitoid including mafic microgranular enclaves intruded into metapelitic and metabasic rocks, and overlain unconformably by Neogene ignimbrites in the Ni^de area of Turkey. It is mostly granite and minor granodiorite in composition, whereas its enclaves are dominantly gabbro with a few diorites in composition. The Uckapdl Granitoid is composed mainly of quartz, K-feldspar, plagioclase, biotite, muscovite and minor amphibole while its enclaves contain mostly plagioclase, amphibole, minor pyroxene and biotite. The Uckapth Granitoid has calcalkaline and peraluminous （AJCNK= 1.0-1.3） geochemical characteristics. It is characterized by high LILE/HFSE and LREE/HREE ratios （（La/Lu）N 3-33）, and has negative Ba, Ta, Nb and Eu anomalies, resembling those of comsion granitoids. The {）fkaplh Granitoid has relatively high STSr/S6Sr0） ratios （0.711189--0.716061） and low eNd（t） values （-5.13 to -7.13）, confirming crustal melting. In contrast, the enclaves are tholeiitic and metaluminous, and slightly enriched in LILEs （K, Rb） and Th, and have negative Ta, Nb and Ti anomalies; propose that they were derived from a subduction-modified mantle source. Based on mineral and whole rock chemistry data, the Uckapth granitoid is H-（hybrid） type, post-collision granitoid developed by mixing/mingllng processes between crustal melts and mantle-derived mafic magmas.

关键词： H-type granitoid mafic enclave geochemistry Central Anatolia Turkey

Single-station microtremor surveys for site characterization:A case study in Erzurum city,eastern Turkey

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Earthquake Engineering and Engineering Vibration 2024年第3期23卷 563-576页

作者： Fatih Karsli erdem Bayrak The Higher Education Credit and Hostels Institution Ministry of Youth and SportsErzurum 25240Turkey Earthquake Research Centre Ataturk UniversityErzurum 25240Turkey Department of Civil Engineering Ataturk UniversityErzurum 25240Turkey

The single-station microtremor method is one of the fastest,most reliable,and cheapest methods used to identify dynamic soil *** study utilizes 49 single-station microtremor measurements to identify the dynamic soil properties of the Hilalkent quarter of the Yakutiye district in *** dominant frequency and the amplification factor were calculated by using the Nakamura horizontal/vertical spectral ratio(H/V)*** the soil dominant frequency values varied between 0.4 Hz and 10 Hz,the soil amplification factor changed between 1 and *** H/V values were acquired with lower frequency *** vulnerability index(K_(g))and shear strain parameters that are utilized to estimate the damage that may be caused by an earthquake were *** in the west side of the study area,higher K_(g) values were *** shear strain map was created with 0.25 g,0.50 g and 0.75 g bedrock accelerations,and soil types that lost elasticity during an earthquake were *** average shear wave velocity for the first 30 m(V_(s30))was ***,it was observed that the western part of the study area,which resulted in a higher period and higher H/V,higher K_(g) and lower V_(s30) values,presents a higher risk of damage during an earthquake.

关键词： Nakamura horizontal/vertical spectral ratio single-station microtremor predominant frequency vulnerability index Erzurum

Exogenous testosterone therapy on choroid in androgen deficiency

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International Journal of Ophthalmology(English edition) 2024年第8期17卷 1489-1494页

作者： Volkan Yeter Nurullah koçak Merve Kalyoncu Ramazan Aşçi Nurşen Aritürk Department of Ophthalmology Ondokuz Mayıs UniversitySamsun 55139Turkey Department of Urology Ondokuz Mayıs UniversitySamsun 55139Turkey

AIM:To investigate the effects of exogenous testosterone treatment on the choroidal parameters in patients with androgen ***:Right eyes of 24 patients with androgen deficiency and 31 healthy volunteers were included in the *** eyes were scanned for subfoveal choroidal thickness(SFCT),choroidal vascularity index(CVI),choroidstromal area(C-SA),choroid-luminal area(C-LA),choroidstromal to luminal area ratio(CSLR),and the choroidal parameters within central 1500μm of the macula(CVI1500,C-LA1500,C-SA1500,and CSLR1500)by enhanced-depth imaging optical coherence tomography(EDI-OCT)at baseline,6th and 18th weeks of the exogenous testosterone ***:The mean SFCT values of the androgen deficient groups and healthy controls were 307.7±27.0 and 303.2±37.2μm(P=0.8).However,CVI,C-SA,CSLR,CVI1500,C-LA1500,and CSLR1500 were significantly different between the groups(all P0.05).However,CVI1500 and LA1500 significantly increased at the end of the follow-up period(Pak are transient in the treatment of patients with androgen ***,the increase in CVI within the central 1500μm of the macula persists even after 4mo.

关键词： testosterone androgen deficiency choroid vascularity index

An integrated approach to assess the ecological and chemical status of lakes with HOD/AHOD: a case study of two lakes

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Journal of Oceanology and Limnology 2019年第1期37卷 146-159页

作者： Serdar GONCü erdem ALBEK Anadolu University Ikieylul Campus Environmental Eng.Dept.

The thermal strati?cation of the lakes impedes the transfer of atmospheric oxygen into the lower layers of the lake. In lakes which are af fected by diverse anthropogenic in?uences, the increasing organic matter amounts lead to a sharp decrease in hypolimnetic oxygen amounts, aided by thermal strati?cation,and anaerobic conditions arise. The determination of hypolimnetic oxygen demand(HOD) and areal hypolimnetic oxygen demand(AHOD) and their monitoring represent an integrated approach to investigate the oxygenation of lakes, the nutrient conditions, and the physicochemical dynamics. In this study, two lakes dif fering by size and af fected by dif ferent anthropogenic sources, are investigated in this respect. At?rst, bathymetric studies were conducted to determine the depth, surface area, and volume ***, based on monitoring studies conducted in 2013 and 2014, the thermal strati?cation dynamics and layer properties were established using the relative thermal resistance to mixing(RTRM) index based on temperature and density pro?les. Following this, the oxygen depletion rates were determined by oxygen and temperature pro?ling in the hypolimnion. For the years of 2013 and 2014, the AHOD values for the Borabey Pond which is far from anthropogenic in?uences, were found to be 0.848 and 0.569 g O 2/(m·d), *** AHOD values for the Porsuk Reservoir which was overburdened for years by industrial and domestic pollution were found to be 4.263 and 5.099 g O 2/(m·d), larger than its counterpart by almost sevenfold. The HOD and AHOD monitoring can be considered to a valuable tool for assessing the ecological and chemical status of lakes within Annex 5 of the Water Framework Directive and as an integrated approach to assess and monitor the status of lakes.

关键词： hypolimnetic oxygen demand(HOD) areal hypolimnetic oxygen demand(AHOD) thermal stratifcation relative thermal resistance to mixing(RTRM) Borabey Pond Porsuk Dam