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The efficiency of direct integration methods in elastic contact-impact problems

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Acta Mechanica Sinica 2005年第4期21卷 395-401页

作者： Ibrahim H.Guzelbey Ahmet Erklig bahattin kanber University of Gaziantep Mechanical Engineering DepartmentGaziantep-Turkey

A comparison of direct integration methods is madeand their efficiency is investigated for impact ***-mark,Wilson-θ,Central Difference and Houbolt Methodsare used as direct integration *** analysisincludes that of elastic and large deformation based uponupdated Lagrangian including buckling *** resultsshow that the direct integration methods give differentresults in different contact-impact cases.

关键词： Elastic impact,Direct integration methods,Finite strain Contact

Customized scaffolds for large bone defects using 3D‑printed modular blocks from 2D‑medical images

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Bio-Design and Manufacturing 2024年第1期7卷 74-87页

作者： Anil AAcar Evangelos Daskalakis Paulo Bartolo Andrew Weightman Glen Cooper Gordon Blunn bahattin Koc Faculty of Engineering and Natural Sciences Sabanci UniversityIstanbul 34956Türkiye D Bioprinting Laboratory Sabanci University Nanotechnology Research and Application CenterIstanbul 34956Türkiye School of Mechanical Aerospace and Civil EngineeringManchester Institute of BiotechnologyUniversity of ManchesterManchester M139PLUK Singapore Centre for 3D Printing School of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingapore 639798Singapore School of Pharmacy and Biomedical Sciences University of PortsmouthPortsmouth PO12UPUK

Additive manufacturing(AM)has revolutionized the design and manufacturing of patient-specific,three-dimensional(3D),complex porous structures known as scaffolds for tissue engineering *** use of advanced image acquisition techniques,image processing,and computer-aided design methods has enabled the precise design and additive manufacturing of anatomically correct and patient-specific implants and ***,these sophisticated techniques can be timeconsuming,labor-intensive,and ***,the necessary imaging and manufacturing equipment may not be readily available when urgent treatment is needed for trauma *** this study,a novel design and AM methods are proposed for the development of modular and customizable scaffold blocks that can be adapted to fit the bone defect area of a *** modular scaffold blocks can be combined to quickly form any patient-specific scaffold directly from two-dimensional(2D)medical images when the surgeon lacks access to a 3D printer or cannot wait for lengthy 3D imaging,modeling,and 3D printing during *** proposed method begins with developing a bone surface-modeling algorithm that reconstructs a model of the patient’s bone from 2D medical image measurements without the need for expensive 3D medical imaging or *** algorithm can generate both patient-specific and average bone ***,a biomimetic continuous path planning method is developed for the additive manufacturing of scaffolds,allowing porous scaffold blocks with the desired biomechanical properties to be manufactured directly from 2D data or *** algorithms are implemented,and the designed scaffold blocks are 3D printed using an extrusion-based AM *** and instructions are also provided to assist surgeons in assembling scaffold blocks for the self-repair of patient-specific large bone defects.

关键词： Additive manufacturing Modular scaffolds Large bone defect Customized scaffold design Patient-specific scaffolds

Finite element analysis of elasto-plastic plate bending problems using transition rectangular plate elements

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Acta Mechanica Sinica 2006年第4期22卷 355-365页

作者： B. kanber O. Yavuz Bozkurt University of Gaziantep Mechanical Engineering Department 27310 Gaziantep Turkey

In this work, the finite element analysis of the elasto-plastic plate bending problems is carried out using transition rectangular plate elements. The shape functions of the transition plate elements are derived based on a practical rule. The transition plate elements are all quadrilateral and can be used to obtain efficient finite element models using minimum number of elements. The mesh convergence rates of the models including the transition elements are compared with the regular element models. To verify the developed elements, simple tests are demonstrated and various elasto-plastic problems are solved. Their results are compared with ANSYS results.

关键词： Finite element method Transition plate elements Elasto-plastic analysis. Plate bending problems

The effects of deficit irrigation on nitrogen consumption,yield,and quality in drip irrigated grafted and ungrafted watermelon

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Journal of Integrative Agriculture 2015年第5期14卷 966-976页

作者： Selcuk zmen Riza kanber Nebahat Sari Mustafa nl University of Dzce Department of Biosystem Engineering University of Cukurova Department of Irrigation and Drainage Engineering University of Cukurova Department of Horticulture

The aim of this study is to determine the effects of deficit irrigation on nitrogen consumption,yield,and quality in grafted and ungrafted *** study was conducted in Cukurova region,Eastern Mediterranean,Turkey,between 2006 and 2008,and employed 3 irrigation rates（full irrigation（l_（100）） with no stress,moderate irrigation（Dl_（70））,and low irrigation（Dl_（50））;Dl_（70） and Dl_（50） were considered deficit irrigation） on grafted（CTJ,Crimson Tide＋Jumbo） and the ungrafted（CT,Crimson Tide） *** amount of irrigation water（IR） applied to the study plots were calculated based on cumulative pan evaporation that occurred during the irrigation *** consumption was 16%lower in CTJ plants than in CT *** the other hand,consumption of nitrogen was 28%higher in Dl_（50） plants than in Dl_（70） plants while it was 23%higher in Dl_（50） plants than in l_（100） *** grafting,the average amount of nitrogen content in seeds,pulps and peels for CTJ was 30,43 and 56%more than those of CT,*** yield and the quality were not significantly affected by the deficit *** this respect,grafting of watermelon gave higher yield,but,it had a slight effect on fruit *** highest yield values of 16.90 and 19.32 kg plant^（-1） in 2008 were obtained with l_（100）and in CTJ plants,***,Dl_（50） treatment could be taken into account for the development of reduced irrigation strategies in semiarid regions where irrigation water supplies are ***,the yield increased by applying CTJ treatment to the watermelon production.

关键词： irrigation deficit grafted grafting fruit slight ammonium consumed solids leaching

Synthesis, Spectroscopic and Electrochemical Investigations of Two vic-Dioximes and Their Mononuclear Ni（Ⅱ）, Cu（Ⅱ） and Co（Ⅱ） Metal Complexes Containing Morpholine Group

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Chinese Journal of Chemistry 2006年第11期24卷 1599-1604页

作者： KILIC, Ahmet TAS, Esref GUMGUM, bahattin YILMAZ, Ismail Department of Chemistry Harran University Sanliurfa 63510 Turkey Department of Chemistry Dicle University Diyarbakir 21280 Turkey Department of Chemistry Technical University oflstanbul Istanbul Maslak 34469 Turkey

Two vic-dioxime ligands （LxH2） containing morpholine group have been synthesized from 4-[2-（dimethylaminoethyl）] morpholine with anti-phenylchloroglyoxime or anti-monochloroglyoxime in absolute THF at -15 ℃. Reaction of two vic-dioxime ligands with MCl2·nH2O （M： Ni, Cu or Co and n=2 or 6） salts in 1 ： 2 molar ratio afforded metal complexes of type [M（LxH）2] or [M（LxH）2·2H2O]. All of metal complexes are non-electrolytes as shown by their molar conductivities （Am） in DMF （dimethyl formamide） at 10^-3 mol·L^-1. Structures of the ligands and metal complexes have been solved by elemental analyses, FT-IR, UV-Vis, ^1H NMR and ^13C NMR, magnetic susceptibility measurements, molar conductivity measurements. Furthermore, redox properties of the metal complexes were investigated by cyclic voltammetry.

关键词： morpholine electrochemistry dioxime structure metal complex cyclic voltammetry

Total estimated effective doses from radiologic imaging modalities of children with cancer:a single center experience

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World Journal of Pediatrics 2017年第3期13卷 242-247页

作者： Derya Ozyorük Suna Emir HacιAhmet Demir Gülsah Bayram Kabacam bahattin Tunc Division of Pediatric Oncology Ankara Children's Hematology and Oncology Education and Research HospitalAnkaraTurkey Division of Radiology Ankara Children's Hematology and Oncology Education and Research HospitalAnkaraTurkey

Background:Recently,awareness of the cumulative radiation exposure for pediatric oncology patients has been increasing,together with increased survival rates and longer life *** aim of our study was to quantify the amount of ionising radiation from imaging modalities of pediatric oncology ***:Eighty-eight patients who were diagnosed with childhood cancer and followed up for 5 years between 2004-2014 in our center were included in the ***' medical files were reviewed retrospectively for imaging history in the first 5 years after *** estimated effective doses from radiologic imaging modalities were ***,the basic demographic data,histologic type,stage,and outcomes of disease were collected for all ***:The individual total estimated effective doses ranged from 8.73 to 167 mSv,with a median of 62.92 *** tomography was the greatest contributor of total effective *** doses ranged 21.45-113.20 mSv (median:62.92 mSv) in Hodgkin lymphoma,12.53-167.10 mSv (median:52 mSv) in non-Hodgkin lymphoma,4.13-172.98 mSv (median:52 mSv) in neuroblastoma,31-149.89 mSv (median:63.10 mSv) in Wilms' tumor,11.50-73.72 mSv (median:36.90 mSv) in germ cell tumor,26.46-125.86 mSv (median:80.90 mSv) in other solid tumor and 0.02-13.31 mSv (5.25 mSv) in brain tumor ***-two children (25%) died with progressive disease during the 5-year follow-up ***:Similar to previous studies,the total estimated effective doses in children with cancer have been found various according to diagnosis,stage and clinical *** clarify the harmfull effects of radiation burden,prospective studies should be conducted in children with cancer.

关键词： children effective dose ionizing radiation

Effect of interferon and ribavirin combined with amantadine in interferon and ribavirin non-responder patients with chronic hepatitis C (genotype 1)

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World Journal of Gastroenterology 2005年第4期11卷 580-583页

作者： Dilek Oguz bahattin Cicek Levent Filik Bulent Odemis Mesut Kilic Engin Altintas Neslihan Zengin Emin Altiparmak Turkiye Yuksek Ihtisas Hospital Gastroenterology Clinic Mersin University Department of Gastroenterology Turkiye Yuksek Ihtisas Hospital Department of Pathology Turkiye Yuksek Ihtisas Hospital Gastroenterology Clinic

AIM: To evaluate the efficacy of amantadine plus interferonalpha and ribavirin in non-responder patients with chronic hepatitis ***: Twenty-six non-responder patients received the regimen of IFN-α-2a at a dose of 6 million units three times a week, 1 000-1 200 mg of ribavirin daily, and 200 mg of amantadine daily in divided doses over 48 wk. After the end of treatment, at the 72nd wk, a sustained viral response rate was ***: An early (after 12 wk of therapy) response was seen in 34.6% (9/26) of patients. Response rate at the 24th wk was 42.3% (11/26). End of treatment response (ETR) was 53.8% (14/26). Sustained viral response (SVR) was 42.3% (11/26). There was a statistically significant difference between 0 and 12 wk (P = 0.04), 0 and 24 wk (P = 0.01), 0 and 48 wk (P = 0.00), and 0 and 72 wk (P = 0.001). No patient had severe adverse effects during the ***: Combination regimen of interferon-α,ribavirin and amantadine can enhance sustained viral response on IFN-α and ribavirin non-responder patients with HCV. Triple therapy with amantadine should be evaluated in further studies.

关键词： Chronic hepatitis C IFN-α-2a Ribavirin

Turkish Van Cat and Turkish Angora Cat： A Review

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Journal of Agricultural Science and Technology(A) 2017年第3期7卷 151-159页

作者： bahattin Cak Department of Animal Science Faculty of Veterinary Science University of Yuzuncu Yil 65080 Van Turkey

Turkish Van and Angora cats are one of most important genetic resources in Turkey. The study aimed to evaluate some morphological properties and also behavioural characteristics in both Turkish Van and Angora cats. This research used both literature and the records from the Van Cat Home at Van Cats Research Centre of Yuzuncu Yil University for Turkish Van cats, as well as literature information for Turkish Angora cat. Van cats which have a special place among world cat races have gained appreciation of people with their original eye colors, long white hair and affectionate attitudes. Origin of Turkish Angora cat breeding in Turkey is Ankara province. Angora cat is strong, energetic, kind, known as a moderately long silky haired cat. According to the results of this study and literature, withers height and body length of Turkish Van cat are higher than the Turkish Angora cat, while tale length and breast girth of Turkish Angora cat are higher than the Turkish Van cat. Body weight （g） of female Turkish Angora cat is heavier than the Turkish Van cat, but male Turkish Van cat is heavier than Turkish Angora cat.

关键词： Turkish Van cat Turkish Angora cat morphological traits.

Viral and host causes of fatty liver in chronic hepatitis B

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World Journal of Gastroenterology 2005年第20期11卷 3056-3059页

作者： Emin Altiparmak Seyfettin K(o|¨)klü Mesut Yalinkilic Osman Yüksel bahattin Cicek Ertugrul Kayacetin Tülin Sahin Department of Gastroenterohepatology Yüksek Ihtisas Hospital Sihhiye Ankara Turkey

AIM: To investigate the viral and host causes of fatty liver in chronic hepatitis B patients and the role of fat deposits in liver ***: A total of 164 patients (113 males and 51 females, average age 35±11.3 years, and range 10-62 years) with previously untreated chronic hepatitis B were included in the study. The patients were divided into two groups depending on the result of liver biopsy: group without steatosis (100 patients with ＜5% hepatosteatosis) and group with steatosis (64 patients with ＞5% hepatosteatosis). The groups were compared in terms of gender, body mass index (BMI), liver enzymes (ALT, AST, ALP, GGT), cholesterol, triglyceride, HBeAg, viral load, and histological findings. In the group with steatosis, the patients were subdivided depending on the degree of steatosis into mild group (45 patients with 5-24% steatosis), and severe group (19 patients with ＞25% steatosis). RESULTS: In the group of chronic hepatitis B with steatosis, the mean age, BMI, cholesterol, and triglyceride levels were significantly higher than those in the group without steatosis (P＜0.05). Steatosis was found in 53 (46.9%) of male patients and 11 (22%) of female patients (P＜0.05). No significant difference was found in the positivity of ALT, AST, ALP, GGT, HBeAg, viral load, histological activity index (HAI) and stage between the two groups (P＞0.05). In the group with severe steatosis, the BMI was significantly higher than that in the group with mild steatosis (P＜0.05). No significant difference was found in the other parameters between the groups (P＞0.05). CONCLUSION: Steatosis in chronic hepatitis B appears to be a result of metabolic factors of the host rather than the effect of viruses. Steatosis is unrelated to the HAI and degree of fibrosis, which are considered as the histological indicators of liver damage.

关键词： Chronic hepatitis B Steatosis