Traumatic Coronary Artery Dissection in a Young Woman after a Kick to Her Back

Emrah Ipek,Emrah Ermis,Selami Demirelli,Erkan Yıldırım,Mustafa Yolcu,Bingül Dilekci Sahin 대한흉부외과학회 2015 Journal of Chest Surgery (J Chest Surg) Vol.48 No.4

We present the case of a 38-year-old woman admitted to our outpatient clinic with accelerating back pain and fatigue following a kick to her back by her husband. Upon arrival, we detected ST segment elevation in the D1, aVL, and V2 leads and accelerated idioventricular rhythm. She had pallor and hypotension consistent with cardiogenic shock. We immediately performed coronary angiography and found a long dissection starting from the mid-left main coronary artery and progressing into the mid-left anterior descending (LAD) and circumflex arteries. She was then transferred to the operating room for surgery. A saphenous vein was grafted to the distal LAD. Since the patient was hypotensive under noradrenaline and dopamine infusions, she was transferred to the cardiovascular surgery intensive care unit on an extracorporeal membrane oxygenator and intra-aortic balloon pump. During follow-up, her blood pressure remained low, at approximately 60/40 mmHg, despite aggressive inotropic and mechanical support. On the second postoperative day, asystole and cardiovascular arrest quickly developed, and despite aggressive cardiopulmonary resuscitation, she died.

Analytical nonlocal elasticity solution and ANN approximate for free vibration response of layered carbon nanotube reinforced composite beams

Emrah Madenci,Saban Gulcu,Kada Draiche Techno-Press 2024 Advances in nano research Vol.16 No.3

This article investigates the free vibration behavior of carbon nanotube reinforced composite (CNTRC) beams embedded using variational analytical methods and artificial neural networks (ANN). The material properties of layered functionally graded CNTRC (FG-CNTRC) beams are estimated using nonlocal parameters modified power-law with different types of CNT distributions through the thickness direction of the beam. Adopting Eringen's nonlocal elasticity theory to capture the small size effects, the nonlocal governing equations are derived and solved using the analytical method. And also, the problem was analyzed using the ANN method. The architecture of the proposed ANN model is 3-9-1. In the experiments, we used 112 different data to predict the natural frequency using ANN. Based on the nonlocal differential constitutive relations of Eringen, the equations of motion as well as the boundary conditions of the beam are derived using Hamilton's principle. The classical beam theory is used to formulate a governing equation for predicting the free vibration of laminated CNTRC beams. According to the experimental results, the prediction ability of the ANN model is very good and the natural frequency can be predicted in ANN without attempting any experiments.

Development of a semi-wet process for ceramic wall tile granule production

Emrah Durgut 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.5

In ceramic tile manufacturing industry, the wet process includes wet grinding and spray drying, is widely used for preparing granule. However, due to the high energy consumption for the water evaporation in spray dryer has become a major problem in wet process. In recent years, there have been vast amount researches for developing of dry granulation processes that consist of dry mills such as vertical roller mill or pendular mill and a granulator, have various problems on the granule shapes and granule size distributions that cause quality problems in the final products. In this research, it is aimed to develop a new production system, called as Semi-Wet Process. The new system consists of a horizontal dryer, dry ball mill, separator and additional high speed mixture. The raw-materials having low humidity are ground to the required fineness in dry size reduction process. The other components of recipe, that are prepared in conventional wet process, are mixed with the dry prepared powder in the mixing slurry tank. The addition of dry powder reduces the water ratio of final suspension, in other words, the bulk density of the slurry increases. Hence, a decrease is shown at the natural gas consumption of the water evaporation in spray dryer. The case application of developed Semi Wet System has been carried out in Kaleseramik Factory, which is the largest ceramic manufacturer in Turkey. The sintered wall tile wastes were ground in the developed system to the fineness of under 63 µm sieve. The dry prepared powder was added by 15% to the body slurry in the mixing tank, the bulk density of the wall tile slip has risen from 1632 g/L to 1750 g/L. As a result, the natural gas consumption has reduced from 52,52 sm3 /ton to 37,52 sm3 /ton. The use of Semi Wet System can provide savings around 6.750.000 sm3 /year for the current production rate at the factory.

Identity of cheese: a research on the cheeses of the Aegean Region in Turkey

Emrah Keskin 한국식품연구원 2020 Journal of Ethnic Foods Vol.7 No.-

Cheese, which has a deep-rooted history, is a food product that reflects the cultural memory and history of communities, besides being a method of preserving milk. Cheese varieties differ according to the cultural structure of the countries, climatic conditions, animal diversity, and production techniques. Different types of cheese are produced in different ways in different geographical regions of Turkey. The Aegean Region, one of the geographical regions in Turkey, stands out with its unique cheese varieties. The current study aims to identify cheeses produced in the Aegean Region and to discuss them in the context of gastronomy tourism and cultural heritage. For this purpose, a document analysis was carried out in order to provide information about the identification and production methods of cheeses specific to the Aegean Region. As a result of the review of the documents, cheeses peculiar to the region were put forward.

Experimental tensile test and micro-mechanic investigation on carbon nanotube reinforced carbon fiber composite beams

Emrah Madenci,Yasin Onuralp Ozkilic,Ahmad Hakamy,Abdelouahed Tounsi Techno-Press 2023 Advances in nano research Vol.14 No.5

Carbon nanotubes (CNTs) have received increased interest in reinforcing research for polymer matrix composites due to their exceptional mechanical characteristics. Its high surface area/volume ratio and aspect ratio enable polymer-based composites to make the most of its features. This study focuses on the experimental tensile testing and fabrication of carbon nanotube reinforced composite (CNTRC) beams, exploring various micromechanical models. By examining the performance of these models alongside experimental results, the research aims to better understand and optimize the mechanical properties of CNTRC materials. Tensile properties of neat epoxy and 0.3%; 0.4% and 0.5% by CNT reinforced laminated single layer (0°/90°) carbon fiber composite beams were investigated. The composite plates were produced in accordance with ASTM D7264 standard. The tensile test was performed in order to see the mechanical properties of the composite beams. The results showed that the optimum amount of CNT was 0.3% based on the tensile capacity. The capacity was significantly reduced when 0.4% CNT was utilized. Moreover, the experimental results are compared with Finite Element Models using ABAQUS. Hashin Failure Criteria was utilized to predict the tensile capacity. Good conformance was observed between experimental and numerical models. More importantly is that Young' Moduli of the specimens is compared with the prediction Halpin-Tsai and Mixture-Rule. Although Halpin-Tsai can accurately predict the Young's Moduli of the specimens, the accuracy of Mixture-Rule was significantly low.

Evaluation of the estrogenic effects of dietary perinatal Trifolium pratense

Emrah Yatkin,Suzan Daglioglu 대한수의학회 2011 Journal of Veterinary Science Vol.12 No.2

This study was designed to investigate the potential estrogenic effects of perinatal dietary phytoestrogens on the rat uterus. Pregnant rats were divided to three groups provided the following diets: (1) rat chow, (2) rat chow with 7.5% Trifolium (T.) pratense, or (3) rat chow supplemented with 17β-estradiol (0.5 mg/kg). The dams in each group were kept on the same diet during pregnancy and lactation. Female offspring were euthanized on day 21 at which time body and organ weights were recorded and tissue samples were taken for histology. Immunohistochemistry was performed to detect estrogen receptor alpha (ERα) and progesterone receptor (PR) levels. Our results revealed estrogen-like biological effects of perinatal T. pratense exposure. Relative uterus and ovary weights in the experimental groups were increased compared to control. The number of uterine glands and luminal epithelium heights were also increased. However, there were no statistically significant changes detected in the immunostaining intensity of ERα and PR between the groups.

A refined functional and mixed formulation to static analyses of fgm beams

Emrah Madenci 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.69 No.4

In this study, an alternative solution procedure presented by using variational methods for analysis of shear deformable functionally graded material (FGM) beams with mixed formulation. By using the advantages of Gâteaux differential approaches, a refined complex general functional and boundary conditions which comprises seven independent variables such as displacement, rotation, bending moment and higher-order bending moment, shear force and higher-order shear force, is derived for general thick-thin FGM beams via shear deformation beam theories. The mixed-finite element method (FEM) is employed to obtain a beam element which have a 2-nodes and total fourteen degrees-of-freedoms. A computer program is written to execute the analyses for the present study. The numerical results of analyses obtained for different boundary conditions are presented and compared with results available in the literature.

Are Marine Accident Really Accident? Fallacy of Random Marine Accidents in Dry Cargo Fleet

Emrah BULUT,Shigeru YOSHIDA 한국해운물류학회 2015 The Asian journal of shipping and Logistics Vol.31 No.2

The aim of this paper is to investigate the relation between marine casualty and dry bulk cargo freight rate according to the existence of spurious accident phenomenon in the dry cargo vessel accidents. According to the conventional expectation, the volume of marine accidents is a random process since it is accidently occurred and not a man-made outcome. Under this circumstance, it is expected that the volume of marine accidents should be statistically uncorrelated with the freight market rates and positively correlated with the fleet size. However, the existence statistics on dry cargo marine accidents indicate high level of negative correlation with freight markets (-0.95 for no. of vessels and -0.79 for the volume of accidents in dwt) and also high level of negative correlation with the fleet size (-0.81 for the volume of accidents in dwt). The asymmetric interaction between the widely accepted facts and the statistical foundations is the main concern of this paper which is named the “Fallacy of Random Marine Accidents (FRMA)”. The possible reasons of the FRMA phenomenon are considered to be based on the man-made marine accidents because of the financial collapse or as the well known term the credit default risk.

Primary Mature Cystıc Teratoma Mimickıng an Adrenal Mass in an Adult Male Patient

Emrah Okulu,Kemal Ener,Mustafa Aldemir,Evren Isik,Cigdem Irkkan,Onder Kayigil 대한비뇨의학회 2014 Investigative and Clinical Urology Vol.55 No.2

Teratomas are bizarre neoplasms derived from embryonic tissues that are typicallyfound only in the gonadal and sacrococcygeal regions of adults. Primary retroperitonealteratomas are rare and present challenging management options. We report a case ofa unilateral primary retroperitoneal mature cystic teratoma mimicking an adrenalmass in a 54-year-old male patient. Complete resection of the adrenal mass was performedby the flank approach by using the 11th rib resection. Because of the risk of malignancy,follow-up radiographic studies were performed to ensure the oncologic efficacyof resection. The patient has been free of recurrence for longer than 12 months.

Free vibration and static analyses of metal-ceramic FG beams via high-order variational MFEM

Emrah Madenci 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.39 No.5

There is not enough mixed finite element method (MFEM) model developed for static and dynamic analysis of functionally graded material (FGM) beams in the literature. The main purpose of this study is to develop a reliable and efficient computational modeling using an efficient functional in MFEM for free vibration and static analysis of FGM composite beams subject to high order shear deformation effects. The modeling of material properties was performed using mixture rule and Mori-Tanaka scheme which are more realistic determination techniques. This method based on the assumption that a two phase composite material consisting of matrix reinforced by spherical particles, randomly distributed in the beam. To explain the displacement components of the shear deformation effects, it was accepted that the shear deformation effects change sinusoidal. Partial differential field equations were obtained with the help of variational methods and then these equations were transformed into a novel functional for FGM beams with the help of Gâteaux differential derivative operator. Thanks to the Gâteaux differential method, the compatibility of the field equations was checked, and the field equations and boundary conditions were reflected to the function. A MFEM model was developed with a total of 10 degrees of freedom to apply the obtained functional. In the numerical applications section, free vibration and flexure problems solutions of FGM composite beams were compared with those predicted by other theories to show the effects of shear deformation, thickness changing and boundary conditions.