Effects of the Loading Direction and Contact Geometry on the High Strain Behavior of Woven Graphite/Epoxy Composites

High strain compressive impact testing was carried out using Split Hopkinson Pressure Bar for woven graphite/epoxy composites transversely and diametrically loaded at the impact energies of 67 J, 113J, 163 J, and 263 J. As it is hypothesized, the results show that thicker exhibit better elastic modulus and lower strain rate deformation. However, no thickness effect was observed on the energy absorption history for transversely loaded specimens even though energy absorption increases with increasing thickness for diametrically loaded specimens. The results show that energy absorption, elastic modulus, ultimate strength, and the strain rate increase with increasing applied energy as it is hypothesized. Most of the expendable energy for specimen damage returns to the system in the transverse loading case, with no visible incipient damage, while some portion of the energy absorption is consumed in the deformation process for the diametrical loading case. Smaller contact area gives larger deformation to the transversely loaded specimens resulting in lower elastic modulus, lower ultimate strength, higher energy absorption because of the energy release, and higher strain rate for the same thickness and impact energy

Analytical solution for bending and buckling response of laminated non-homogeneous plates using a simplified-higher order theory

In this study, analytical solutions for the bending and buckling analysis of simply supported laminated non-homogeneous composite plates based on first and simplified-higher order theory are presented. The simplified-higher order theory assumes that the in-plane rotation tensor is constant through the thickness. The constitutive equations of these theories were obtained by using principle of virtual work. Numerical results for the bending response and critical buckling loads of cross-ply laminates are presented. The effect of non-homogeneity, lamination schemes, aspect ratio, side-to-thickness ratio and in-plane orthotropy ratio on the bending and buckling response were analysed. The obtained results are compared with available elasticity and higher order solutions in the literature. The comparison studies show that simplified-higher order theory can achieve the same accuracy of the existing higher order theory for non-homogeneous thin plate

Examination of the Attitudes of School of Physical Education and Sports Students towards Teaching Profession in Terms of Various Variables

The aim of this research is to determine the attitudes of the students who are studying in the physical education and sports departments towards the teaching profession. 244 students attending Ahi Evran University School of Physical Education and Sports and Fırat University Sports Sciences Faculty Physical Education and Sport Teacher Training, Sports Management and Coaching Education departments participated in the research. In the research, personal data form and attitude scale for the teaching profession composed of 34 items were used as data collection means. Distribution, frequency, t test and anova test were performed in the comparison of the related data. Statistical analyzes show that attitudes of participants to the teaching profession do not differ in terms of gender and whether they are teachers in the family, the university in which the training was conducted and the type of sport made

Examınatıon of the Factors Effectıng the Use of Parks and Recreatıon Areas in Terms of Dıfferent Varıables

The aim of this study was to determine the factors that are effective in the non-preference of Park and recreation areas in the city center of Gaziantep Metropolitan municipality according to different variables. There were no significant differences between the income and the variables affecting participation in activities in parks and recreation areas (p> 0.05), and the absence of participation in activities in parks and recreation areas when women prefer park and recreation areas (p <0.05). There was no significant difference between health status of participants and reasons of not choosing park and recreation areas (p> 0.05). Women in parks and recreation areas are more likely to be exposed to physical assault than men, and those who do not have the necessary spare time to participate in these areas are not very interested in recreation areas because of their family responsibilities they have not been able to use such areas

Magnetic-Visual Sensor Fusion-based Dense 3D Reconstruction and Localization for Endoscopic Capsule Robots

Reliable and real-time 3D reconstruction and localization functionality is a crucial prerequisite for the navigation of actively controlled capsule endoscopic robots as an emerging, minimally invasive diagnostic and therapeutic technology for use in the gastrointestinal (GI) tract. In this study, we propose a fully dense, non-rigidly deformable, strictly real-time, intraoperative map fusion approach for actively controlled endoscopic capsule robot applications which combines magnetic and vision-based localization, with non-rigid deformations based frame-to-model map fusion. The performance of the proposed method is demonstrated using four different ex-vivo porcine stomach models. Across different trajectories of varying speed and complexity, and four different endoscopic cameras, the root mean square surface reconstruction errors 1.58 to 2.17 cm.Comment: submitted to IROS 201

Katılımcı Demokrasi: Kapsam ve Unsurlar

DergiPark: 330573trakyaiibfDemokrasi var olduğu günden bugüne kadar sayısızkavramla birlikte tanımlanarak açıklanmaya çalışılmış, böylece her uygulanmakistenen veya uygulanan yönetim sistemi demokrasinin bir modeli olarak karşımızaçıkmıştır. Çok sayıdaki bu demokrasi söylemi kaçınılmaz olarak kavramın içininboşalmasına ve özünden uzaklaşmasına yol açmıştır. Ancak demokrasi, istersiyasal bir rejimin karşılığı, isterse de bir örgütün yönetim biçimi olarak elealınsın en basit ve duru haliyle üyelerin, paydaşların, yurttaşların,hemşerilerin vb. fiili ve sözlü katılımını gerekli gören bir olgudur. Dolayısıylademokrasi katılımcı olduğu takdirde iktidarın veya karar alma yetkisinin eşitpaylaşımına olanak tanıyan bir anlayışın ifadesi olabilecektir. Bu düşünce vegörüşlerden hareketle çalışmada katılımcı bir demokrasinin gerçek anlamıylaneyi ifade etmesi gerektiği, katılım olgusuna nasıl bir mana ve önem yüklediği,bu kapsamda kendisini mümkün kılabilmek, süreklilik sorunu yaşamayan somut birkavram haline dönüştürebilmek için hangi temel unsurlara atıfta bulunduğuaçıklanmaya çalışılmıştır

Effects of the loading direction on high strain rate behavior of woven graphite/epoxy composites

Effects of the loading direction on high strain rate behavior of cylindrical woven graphite/epoxy composites are presented. Compressive split Hopkinson pressure bar (SHPB) was used for high strain rate experiments. Cylindrical specimens were loaded diametrically and transversely at the impact energies of 67 J, 163 J, and 263 J. Micro Laser Raman spectroscopy and scanning electron microscopy (SEM) were used for surface characterization. It is observed that diametrically loaded specimens show permanent plastic deformation with high ductility resulting in a catastrophic failure while transversely loaded specimens exhibit viscoplastic deformation with some recoverable damage. As a result of this, Raman peak shifted to higher values for the diametrically loaded fibers whereas almost no change was observed in the Raman shift of transversely loaded fibers

Effect of the contact geometry on high strain rate behavior of woven graphite/epoxy composites

Effects of the loading direction on high strain rate behavior of cylindrical woven graphite/epoxy composites are presented. Compressive split Hopkinson pressure bar (SHPB) was used for high strain rate experiments. Cylindrical specimens were loaded diametrically and transversely at the impact energies of 67 J, 163 J, and 263 J. Micro Laser Raman spectroscopy and scanning electron microscopy (SEM) were used for surface characterization. It is observed that diametrically loaded specimens show permanent plastic deformation with high ductility resulting in a catastrophic failure while transversely loaded specimens exhibit viscoplastic deformation with some recoverable damage. As a result of this, Raman peak shifted to higher values for the diametrically loaded fibers whereas almost no change was observed in the Raman shift of transversely loaded fibers

Całkowita histerektomia laparoskopowa metodą pojedynczego nacięcia pępkowego: technika i pierwsze doświadczenia w Turcji

Objectives: The aim of the study is to determine the results of our initial experience of 32 cases who underwent single incision total laparoscopic hysterectomy. Materials and Methods: Thirty-two patients who underwent transumbilical single incision total laparoscopic hysterectomy between March 2009 and February 2011 were reviewed retrospectively at the Department of Obstetrics and Gynecology, Ege University Faculty of Medicine, Izmir, Turkey. Articulating and rigid instruments, 30 degrees 10 mm telescope, SILS™ port and advanced bipolar and mechanical energy modalities were used during the procedure. Duration of surgery, length of hospital stay, mean blood loss and postoperative complications were assessed. Results: Mean age of patients and mean operation time were 48 years (ranged 42-55) and 108 minutes (ranged 80-180), respectively. In all cases vaginal cuff s were closed with either intracorporeal or extracorporeal separate sutures. There were no intraoperative complications. All patients were discharged within 48 hours postoperatively. The mean length of hospital stay and mean blood loss were as 1.6 days (range 1-2) and 45 ml (range 30-100), respectively. Conclusions: Total laparoscopic hysterectomy performed through transumbilical single incision is technically feasible and safe. Development of advanced fl exible instrumentation and visualization platform may facilitate this new operative approach.Cel pracy: Celem tego badania była ocena wyników naszego pierwszego doświadczenia z 32 pacjentkami, które przeszły całkowitą laparoskopową histerektomię metodą pojedynczego nacięcia. Materiał i metoda: Przeanalizowano retrospektywnie trzydzieści dwie pacjentki, które przeszły całkowitą laparoskopową histerektomię metodą pojedynczego nacięcia pępkowego pomiędzy marcem 2009 a lutym 2011, w Oddziale Położniczo-Ginekologicznym, Ege University Faculty of Medicine w Turcji. W trakcie procedury użyto instrumentarium giętkiego i sztywnego, endoskopu o kącie widzenie 30°, 10mm, portu SILSTM i zaawansowanych urządzeń bipolarnych oraz energii mechanicznej. Oceniono czas trwania operacji, długość pobytu w szpitalu, średnią utratę krwi i komplikacje pooperacyjne. Wyniki: Średnia wieku pacjentek wynosiła 48 lat (zakres 42-55), średni czas trwania operacji 108 minut (zakres 80-180). We wszystkich przypadkach mankiet pochwy zeszyto osobnymi szwami wewnątrzbrzusznymi lub zewnątrzbrzusznymi. Nie obserwowano żadnych powikłań w trakcie operacji. Wszystkie pacjentki wypisano do domu w ciągu 48 godzin od operacji. Średni czas pobytu w szpitalu wynosił 1,6 dni (zakres 1-2) a utrata krwi wynosiła 45ml (zakres 30-100). Wnioski: Całkowita laparoskopowa histerektomia metodą pojedynczego nacięcia pępkowego jest technicznie wykonalna i bezpieczna. Ulepszanie zaawansowanego, elastycznego instrumentarium oraz możliwości wizualizacji ułatwiają to nowe podejście operacyjne

Unsupervised Odometry and Depth Learning for Endoscopic Capsule Robots

In the last decade, many medical companies and research groups have tried to convert passive capsule endoscopes as an emerging and minimally invasive diagnostic technology into actively steerable endoscopic capsule robots which will provide more intuitive disease detection, targeted drug delivery and biopsy-like operations in the gastrointestinal(GI) tract. In this study, we introduce a fully unsupervised, real-time odometry and depth learner for monocular endoscopic capsule robots. We establish the supervision by warping view sequences and assigning the re-projection minimization to the loss function, which we adopt in multi-view pose estimation and single-view depth estimation network. Detailed quantitative and qualitative analyses of the proposed framework performed on non-rigidly deformable ex-vivo porcine stomach datasets proves the effectiveness of the method in terms of motion estimation and depth recovery.Comment: submitted to IROS 201