检索结果-南通市图书馆

Mechanical behaviour of adhesively single lap joint under buckling conditions

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2021年第2期34卷 154-164页

作者： Ferhat KADIOGLU Department of Aerospace Engineering Ankara Yildirim Bcvazit University06050 UlusAnkaraTurkey

Adhesive Single Lap Joints have been subjected to tensile and bending investigations by many researchers. However, the joint is also likely to experience buckling loading in some aerospace applications. The aim of this work is to investigate the joint behaviour under quasi-static buckling conditions. For this purpose, the joints with three different adherend thicknesses and 25 mm overlap length were tested using two different types of adherends and an adhesive film. They were modelled using a non-linear Finite Element Method via the ABAQUS Explicit package *** to failure and stress distributions in the joints were predicted and compared with the experimental results, which were found in a good agreement. The adhesive layer in the joint was assumed to experience shear stresses under the buckling mode, similar to that in tensile loading, yet, the stress concentrations at the ends of the overlap, the main cause of the failure, resulted in different effects on the joint performance;for the buckling mode the critical stresses were in compression but for the tensile case in peeling. Unlike the latter, the former was found to prevent failure of the layer depending on the adherend thickness, causing different failure mechanisms. There were two different failure modes of the joints;a complete failure in the adhesive layer and large plastic deformation of adherends which could be a good source for crashworthiness situations. Mechanical properties of the adherends were found to play important roles on the joint performance.

关键词： Adhesive joins Buckling mode Energy absorption Finite element method Single lap joint

Lacidipine,thiamine pyrophosphate and their combination on the ocular ischemic syndrome induced by bilateral common carotid artery ligation

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2024年第5期17卷 815-821页

作者： Ibrahim Cicek Ahmet Mehmet Somuncu Durdu Altuner Bahadir Suleyman Renad Mammadov Seval Bulut Taha Abdulkadir Coban Tugba Bal Tastan Halis Suleyman Department of Ophthalmology Faculty of MedicineErzincan Binali Yildirim UniversityErzincan 24100Turkey Department of Pharmacology Faculty of MedicineErzincan Binali Yildirim UniversityErzincan 24100Turkey Department of Clinical Biochemistry Faculty of MedicineErzincan Binali Yildirim UniversityErzincan 24100Turkey Department of Histology and Embryology Faculty of MedicineErzincan Binali Yildirim University ErzincanErzincan 24100Turkey

AIM:To investigate the effect of lacidipine,thiamine pyrophosphate(TPP)and the combination of lacidipine and TPP against oxidative and inflammatory eye damage induced by bilateral common carotid artery ligation in ***:Male albino Wistar rats were categorized as those who underwent sham surgery(SG),right and left common carotid cross-clamping and unclamping procedure(CCU),lacidipine+CCU(LCCU),TPP+CCU(TCCU),and combination of lacidipine and TPP(LTC)+CCU(LTCCU).One hour before anesthesia,the LCCU(n=6)received lacidipine(4 mg/kg,orally)and the TCCU(n=6)received TPP(20 mg/kg,intraperitoneally).The SG(n=6)and CCU(n=6)received the same volume of distilled water from the same *** anesthesia(60 mg/kg ketamine,intraperitoneally),the necks of the rats were opened in the *** was created for 10min by placing clips on the right and left common carotid *** in the SG only underwent subcutaneous *** 10min,the clips were removed and reperfusion was achieved for six ***,the animals were euthanized(120 mg/kg ketamine,intraperitoneally)and the levels of oxidant,antioxidant and proinflammatory cytokines in the eye tissues were *** retinal tissue of the eye was also examined ***:Lacidipine,TPP,and LTC significantly prevent the increase in malondialdehyde,tumor necrosis factoralpha,interleukin-1β(IL-1β),and IL-6 levels,decrease in total glutathione levels,superoxide dismutase and catalase activities and histopathological retinal damage in eye tissue induced by bilateral common carotid artery ligation in *** impact of these drugs on protection is determined to be LTC>lacidipine>***:As a result of the study,it is concluded that LTC may be more effective than lacidipine and TPP alone in treating ocular ischemic syndrome.

关键词： ocular ischemic syndrome lacidipine thiamine pyrophosphate oxidative stress

Complementary comments on diagnosis,severity and prognosis prediction of acute pancreatitis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2024年第1期30卷 108-111页

作者： Muhsin Ozgun Ozturk Sonay Aydin Department of Radiology Erzincan Binali Yildirim UniversityErzincan 24000Turkey

The radiological differential diagnosis of acute pancreatitis includes diffuse pancreatic lymphoma,diffuse autoimmune pancreatitis and groove located mass lesions that may mimic groove *** energy computed tomography and diffusion weighted magnetic resonance imaging are useful in the early diagnosis of acute pancreatitis,and dual energy computed tomography is also useful in severity assessment and prognosis *** off necrosis is an important complication in terms of prognosis,and it is important to know its radiological findings and distinguish it from pseudocyst.

关键词： Acute pancreatitis Computed tomography Diffusion weighted imaging Dual energy computed tomography Walled off necrosis

Clinical outcomes of 25-gauge vitrectomy surgery for vitreoretinal diseases: comparison of vitrectomy alone and phaco-vitrectomy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2016年第8期9卷 1163-1169页

作者： Mucella Arikan Yorgun Yasin Toklu Melek Mutlu Umut Ozen Department of Ophthalmology Ankara Ataturk Education and Research Hospital Yildirim Beyazit University

AIMTo compare the clinical outcomes of combined 25-gauge pars plana vitrectomy (PPV) and phacoemulsification/posterior chamber intraocular lens (PC-IOL) implantation with vitrectomy alone surgery in patients with various vitreoretinal *** total of 306 eyes (145 with PPV alone and 161 with phaco-vitrectomy) were enrolled in this retrospective analysis. The surgical approach was 25-gauge PPV combined with phacoemulsification and PC-IOL implantation at the same time in eyes in phaco-vitrectomy group and only PPV in eyes in vitrectomy alone surgery group. The main outcome measures were postoperative clinical outcomes included anterior chamber inflammation, changes in intraocular pressure (IOP) and best corrected visual acuity (BCVA).RESULTSThe most common postoperative complication was anterior chamber reaction which has higher incidence in phaco-vitrectomy group (Pst day IOP of vitrectomy alone group was significantly lower than that of phaco-vitrectomy group (16.3±5.8 mm Hg vs 17.8±8.1 mm Hg, respectively, P=0.02). Hypotony (IOP≤8 mm Hg) was not different between groups in the postoperative 1st day (P>0.05). The mean preoperative visual acuity was not different between groups (1.6±0.9 logMAR vs 1.8±0.9 logMAR, respectively, P>0.05). However, the mean visual acuity was decreased in vitrectomy alone group at the final visit compared to phaco-vitrectomy group (1.2±0.8 logMAR, 0.9±0.7 logMAR, respectively P<0.05).CONCLUSIONTwenty-five gauge PPV combined with phacoemulsification surgery is a safe and efficient procedure, which can be preferred in phacic patients with a variety of vitreoretinal diseases compared to vitrectomy alone. Despite improved outcomes, this approach is not free of limitations as anterior chamber complications especially with combined surgery.

关键词： pars plana vitrectomy phacoemulsification small gauge vitrectomy

Response letter to “Acute cholangitis: Does malignant biliary obstruction vs choledocholithiasis etiology change the outcomes?” with imaging aspects

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2024年第5期12卷 1029-1032页

作者： Sonay Aydin Baris Irgul Department of Radiology Erzincan Binali Yildirim UniversityErzincan 24100Turkey

Radiological imaging findings may contribute to the differentiation of malignant biliary obstruction from choledocholithiasis in the etiology of acute cholangitis.

关键词： Malignant biliary obstruction Choledocholithiasis Acute cholangitis Dilated bile ducts Magnetic resonance cholangiopancreatography Endoscopic retrograde cholangiopancreatography

New autologous material for the frontalis suspension technique:superficial temporal fascia

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2016年第2期9卷 315-317页

作者： Elif Sari Hulda Rifat Ozakpinar Ali Teoman Tellioglu Department of Plastic Reconstructive and Aesthetic Surgery Kirikkale University Faculty of Medicine Clinic of Plastic Reconstructive and Aesthetic SurgeryDiskapi Yildirim Beyazit Education and Research Hospital Department of Plastic Reconstructive and Aesthetic Surgery Yildirim Beyazit University Faculty of Medicine

The frontalis suspension technique, which is a well-known surgical procedure, has been used for congenital ptosis for many years [1]. Several autologous and foreign grafts or materials have been preferred for this suspension, such as collagen, tensor fascia lata, palmaris longus tendon, deep temporal fascia, catgut, prolene, silicone, stainless steel, and supramid suture . Each of these have their own advantages and disadvantages; however, the superficial temporal fascia has not been used for the frontalis suspension method before.

关键词： Figure New autologous material for the frontalis suspension technique

Occupant friendly seismic retrofit by concrete plates

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第11期14卷 789-804页

作者： Mehmet BARAN Merve AKTAS Department of Civil Engineering Engineering and Natural Sciences Faculty Yildirim Beyazit University06110 Ulus Ankara Turkey Institute of Science Kirikkale UniversityYahsihan 71450 Kirikkale Turkey

An innovative occupant friendly retrofitting technique has been developed for reinforced concrete(RC) building structures with hollow brick infill walls used as partition walls which constitute the major portion of the existing building stock in Turkey. The idea is to convert the existing hollow brick infill wall into a load carrying system acting as a cast-in-place RC wall by reinforcing it with relatively thin concrete plates bonded to the mortar coated infill wall by use of tile adhesive and fixed by 6(6 mm diameter) bolts. Test parameters were the shape and thickness of the plates, presence of reinforcement in plates, number and arrangement of 6 bolts. It was observed that lateral strength, stiffness, energy dissipation capacity, and ductility of the strengthened infill walls were improved and behaviour was enhanced by the proposed technique. Plates with two different basic shapes were used to strengthen the test specimens.

关键词： Reinforced concrete(RC) Strengthening Concrete plate Lateral strength Stiffness Hollow brick infills Reversed-cyclic lateral loads

Stock prices and economic activity nexus in OECD countries:new evidence from an asymmetric panel Granger causality test in the frequency domain

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Financial Innovation 2021年第1期7卷 233-254页

作者： Veli Yilanci Onder Ozgur Muhammed Sehid Gorus Sakarya University SerdivanSakaryaTurkey Ankara yildirim Beyazit Universitesi ÇubukAnkaraTurkey

This study investigates the stock price–economic activity nexus in 12 member countries of the Organization for Economic Cooperation and Development(OECD)by employing monthly data over the period 1981:1–2018:*** this purpose,the study uses Granger causality in the frequency domain in the panel setting by decomposing the symmetric and asymmetric *** methodology determines whether the predictive power of interested variables is concentrated on quickly,moderately,or slowly fluctuating *** findings show that the stock prices have predictive power for future long-term economic activity in the panel ***,economic activity has more reliable information for stock prices for negative ***,empirical findings for asymmetric shocks are not fully consistent with those of symmetric ***,the country-specific results provide different causal linkages across members and *** findings may provide valuable information for policymakers to design proper and effective policies in OECD countries regarding the stock market and economic activity nexus.

关键词： Asymmetric causality Economic activity Frequency domain OECD countries Panel data Stock prices

Taxifolin attenuates ischemia-reperfusion induced oxidative ovarian damage in rats

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian pacific Journal of Reproduction 2021年第4期10卷 168-175页

作者： Sevil Kiremitli Tunay Kiremitli Umit Nayki Nesrin Yilmaz Can Turkler Kemal Dinc Renad Mammadov Gulce Naz Yazici Mine Gulaboglu Nihal Cetin Erzincan Binali yildirim University Faculty of Medicine Department of Obstetrics and GynaecologyErzincanTurkey Erzincan Binali yildirim University Faculty of Medicine Department of PharmacologyErzincanTurkey Erzincan Binali yildirim University Faculty of Medicine Department of Histology and EmbryologyErzincanTurkey Ataturk University Faculty of Pharmacy Department of BiochemistryErzurumTurkey Selcuk University Faculty of Medicine Department of PharmacologyKonyaTurkey

Objective:To investigate preventive effects of taxifolin on ischemia-reperfusion induced oxidative ovarian damage in ***:A total of 18 female Wistar albino rats were randomly and equally divided into three groups:the sham group,the ovarian ischemia reperfusion group,and the 50 mg/kg taxifolin+ovarian ischemia reperfusion *** ovarian ischemia reperfusion and taxifolin+ovarian ischemia reperfusion groups were exposed to ischemia for 2 h and then followed by two-hour reperfusion *** and histopathologic examinations were performed on the extracted ***:Levels of malondialdehyde and cyclooxygenase-2 were increased,while reduced-glutathione and cyclooxygenase-1 were decreased in the ovarian ischemia reperfusion ***,these values were reversed in the taxifolin+ovarian ischemia reperfusion ***,the number of primordial and developing follicules decreased in the ovarian ischemia reperfusion group,while they were within normal range in the taxifolin+ovarian ischemia reperfusion ***:Ischemia followed by reperfusion leads to oxidative stress-related ovarian injury,and taxifolin may be useful for protecting ovarian tissue from such injury.

关键词： Antioxidants Ischemia-reperfusion Ovarian damage Rat Taxifolin Oxidative stress Ovarian torsion