Yazar "Kaya B." seçeneğine göre listele
Listeleniyor 1 - 6 / 6
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Determination and mapping of tear load, tensile strength and extension values on overall area of Goatskin leathers(Certex, INCDTP-ICPI, 2016) Mutlu M.M.; Ork N.; Kaya B.; Gunesel S.Leather can be defined as a protein based fibrillary network, which consists mainly from collagen. The look, length and thickness of these fiber bundles are different in various organs of the body. Thus, leather is not a uniform material from a structural perspective and the properties of a leather piece depend on the position and direction over its area. The aim of this study was to measure some physical properties of goatskin leathers such as tear load, tensile strength and extension over the whole area and to draw maps showing regional variations. For this aim, whole the surface areas of 12 goatskin leathers have been sampled. Thickness, tear load, tensile strength and extension at break values of each sample have been measured and recorded. Then maps were drawn by using MATLAB (Matrix Laboratory) software that allows matrix manipulations, plotting of functions and data. The findings showed that the tear load, tensile strength and extension properties change directionally and locational over the area of the leather. These maps will provide information for usage area of the leathers especially for cutting in footwear production. © 2016 Certex, INCDTP-ICPI.Öğe EUROASPIRE-IV: European Society of Cardiology study of lifestyle, risk factors, and treatment approaches in patients with coronary artery disease: Data from Turkey [EUROASPIRE-IV: Avrupa Kardiyoloji Dernegi'nin koroner arter hastalarinda yaşam tarzi, risk faktörleri ve tedavi yaklaşimi üzerine çalişmasi: Türkiye verileri](Turkish Society of Cardiology, 2017) Tokgözoglu L.; Kayikçioglu M.; Altay S.; Aydogdu S.; Barçin C.; Bostan C.; Çakmak H.A.; Çatakoglu A.B.; Emet S.; Ergene O.; Kalkan A.K.; Kaya B.; Kaya C.T.; Kaymaz C.; Koylan N.; Kültürsay H.; Oguz A.; Özpelit E.; Ünlü S.Objective: Data from EUROASPIRE-IV Turkey report investigating risk factors and adherence to guidelines in patients hospitalized for coronary artery disease are presented and results are compared with those of EUROASPIRE-III Turkey and EUROASPIRE-IV Europe. Methods: Study was performed in 24 European countries, including Turkey (17 centers). Patients (18-80 years old) hospitalized for coronary (index) event during preceding 3 years were identified from hospital records and interviewed ?6 months later. Patient information regarding index event was acquired from hospital records. Anamnesis was obtained during the interview, and physical examination and laboratory analyses were performed. Results: Median age at the index coronary event was 58.8 years, and it was significantly decreased compared with last EU-ROASPIRE-III study (60.5 years), which was conducted at the same centers 6 years earlier (p=0.017). Of all patients, 19.3% were under 50 years of age and mean age was lower than that of EUROASPIRE-IV Europe (62.5 years). Comparing EUROASPIRE-IV Turkey with EUROASPIRE-III Turkey, rate of smokers increased to 25.5% from 23.1% (p=0.499), obesity increased to 40.7% from 35.5% (p=0.211), total cholesterol level increased to 49.6% from 48.3% (p=0.767), and diabetes rate increased to 39.7% from 33.6% (p=0.139), however none of the differences reached a level of statistical significance. Only 11.7% of the smokers quit after coronary event. Rates for these factors were lower in EUROASPIRE-IV Europe (16% for smoking, 37.6% for obesity, and 26.8% for diabetes). Conclusion: EUROASPIRE-IV Turkey data revealed that secondary prevention was unsatisfactory and had progressed unfavorably compared with last EUROASPIRE study, some risk factors were more uncontrolled than overall European average, and coronary artery events at young age remain an important problem. © 2017 Türk Kardiyoloji Dernegi.Öğe Is there a gender gap in secondary prevention of coronary artery disease in Turkey? [Türkiye’de koroner arter hastalığından ikincil korunmada cinsiyet etkisi var mıdır?](Turkish Society of Cardiology, 2018) Koçyiğit D.; Tokgözoğlu L.; Kayıkçıoğlu M.; Altay S.; Aydoğdu S.; Barçın C.; Bostan C.; Çakmak H.A.; Çatakoğlu A.B.; Emet S.; Ergene O.; Kalkan A.K.; Kaya B.; Kaya C.; Kaymaz C.; Koylan N.; Kültürsay H.; Oğuz A.; Özpelit E.; Ünlü S.Objective: It has been reported that women receive fewer preventive recommendations regarding pharmacological treatment, lifestyle modifications, and cardiac rehabilitation compared with men who have a similar risk profile. This study was an investigation of the impact of gender on cardiovascular risk profile and secondary prevention measures for coronary artery disease (CAD) in the Turkish population. Methods: Statistical analyses were based on the European Action on Secondary and Primary Prevention through Intervention to Reduce Events (EUROASPIRE)-IV cross-sectional survey data obtained from 17 centers in Turkey. Male and female patients, aged 18 to 80 years, who were hospitalized for a first or recurrent coronary event (coronary artery bypass graft, percutaneous coronary intervention, acute myocardial infarction, or acute myocardial ischemia) were eligible. Results: A total of 88 (19.7%) females and 358 males (80.3%) were included. At the time of the index event, the females were significantly older (p=0.003) and had received less formal education (p<0.001). Non-smoking status (p<0.001) and higher levels of depression and anxiety (both p<0.001) were more common in the female patients. At the time of the interview, conducted between 6 and 36 months after the index event, central obesity (p<0.001) and obesity (p=0.004) were significantly more common in females. LDL-C, HDL-C or HbA1c levels did not differ significantly between genders. The fasting blood glucose level was significantly higher (p=0.003) and hypertension was more common in females (p=0.001). There was no significant difference in an increase in physical activity or weight loss after the index event between genders, and there was no significant difference between genders regarding continuity of antiplatelet, statin, beta blocker or ACEi/ARB II receptor blocker usage (p>0.05). Conclusion: Achievement of ideal body weight, fasting blood glucose and blood pressure targets was lower in women despite similar reported medication use. This highlights the importance of the implementation of lifestyle measures and adherence to medications in women. © 2018 Turkish Society of Cardiology.Öğe An optimization model and waterhammer for sprinkler irrigation systems(Scientific and Technical Research Council of Turkey, Ankara, Turkey, 2000) Kaya B.; Güney M.S.There are many possible layouts for transporting water from its source to hydrants. That is why the most economical solution must be found. In practice, trial and error procedures are usually applied to determine the economical layout. The diameters of conveyance systems are then found by optimizing the network. However, such an approach does not guarantee an optimum solution. Nowadays, there are many models and related computer programs to solve this problem, but they also have many drawbacks. For example, dynamic programming procedures have limited usage due to the necessity of preparing new programs for each application. In sprinkler irrigation systems, which are pressurized branched piping systems, flow changes initiate pressure fluctuations called 'waterhammer'. Such hydraulic transients must be investigated thoroughly for the safety of the system. For the economical design of a sprinkler irrigation system for a given field, a two-step procedure comprising 1. optimization of system layout, 2. optimization of the system, may be used, but it is usually misleading to separate these two steps. This is because the diameters must be known to optimize the layout, and the layout of the system is necessary to determine the diameters. That is why these two steps must be handled together for the optimum design. In this study, the shortest path algorithms of Graph theory are first used for determination of the layout and then the optimum diameters are determined. The economical solution is investigated by taking into account the cost of each pipe segment and by changing their lengths. The obtained networks are then optimized to arrive at the economical system. The dynamic programming models for optimizing the gravitational or pumping systems with one source are presented. The branched systems may have any configuration. Furthermore, a computer program is developed to analyze waterhammer by the use of the characteristics method with interpolation. The approach used is demonstrated in the case of a simple system and the results are evaluated.There are many possible layouts for transporting water from its source to hydrants. That is why the most economical solution must be found. In practice, trial and error procedures are usually applied to determine the economical layout. The diameters of conveyance systems are then found by optimizing the network. However, such an approach does not guarantee an optimum solution. Nowadays, there are many models and related computer programs to solve this problem, but they also have many drawbacks. For example, dynamic programming procedures have limited usage due to the necessity of preparing new programs for each application. In sprinkler irrigation systems, which are pressurized branched piping systems, flow changes initiate pressure fluctuations called `waterhammer'. Such hydraulic transients must be investigated thoroughly for the safety of the system. For the economical design of a sprinkler irrigation system for a given field, a two-step procedure comprising 1. optimization of system layout, 2. optimization of the system, may be used, but it is usually misleading to separate these two steps. This is because the diameters must be known to optimize the layout, and the layout of the system is necessary to determine the diameters. That is why these two steps must be handled together for the optimum design. In this study, the shortest path algorithms of Graph theory are first used for determination of the layout and then the optimum diameters are determined. The economical solution is investigated by taking into account the cost of each pipe segment and by changing their lengths. The obtained networks are then optimized to arrive at the economical system. The dynamic programming models for optimizing the gravitational or pumping systems with one source are presented. The branched systems may have any configuration. Furthermore, a computer program is developed to analyze waterhammer by the use of the characteristics method with interpolation. The approach used is demonstrated in the case of a simple system and the results are evaluated.Öğe Preliminary results from a nationwide adult cardiology perspective for pulmonary hypertension: Registry on clinical outcome and survival in pulmonary hypertension groups (SIMURG)(Turkish Society of Cardiology, 2017) Kaymaz C.; Mutlu B.; Serdar Küçükoğlu M.; Kaya B.; Akdeniz B.; Avcı B.K.; Aksakal E.; Akbulut M.; Arıtürk Z.A.; Güllülü S.; Taçoy G.A.; Kayıkçıoğlu M.; Nalbantgil S.; Örem C.; Erer H.B.; Yüce M.; Ermiş N.; Tüfekçioğlu O.; Demir M.; Yılmaz M.B.; Kaya M.G.; Kültürsay H.; Öngen Z.; Tokgözoğlu L.Objective: The present study was designed to evaluate the characteristics of pulmonary hypertension (PH) and adult cardiology practice patterns for PH in our country. Methods: We evaluated preliminary survey data of 1501 patients with PH (females, 69%; age, 44.8±5.45) from 20 adult cardiology centers (AdCCs). Results: The average experience of AdCCs in diagnosing and treating patients with PH was 8.5±3.7 years. Pulmonary arterial hypertension (PAH) was the most frequent group (69%) followed by group 4 PH (19%), group 3 PH (8%), and combined pre- and post-capillary PH (4%). PAH associated with congenital heart disease (APAH-CHD) was the most frequent subgroup (47%) of PAH. Most of the patients’ functional class (FC) at the time of diagnosis was III. The right heart catheterization (RHC) rate was 11.9±11.6 per month. Most frequently used vasoreactivity agent was intravenous adenosine (60%). All patients under targeted treatments were periodically for FC, six-minute walking test, and echo measures at 3-month intervals. AdCCs repeated RHC in case of clinical worsening (CW). The annual rate of hospitalization was 14.9±19.5. In-hospital use of intravenous iloprost reported from 16 AdCCs in CWs. Bosentan and ambrisentan, as monotreatment or combination treatment (CT), were noted in 845 and 28 patients, respectively, and inhaled iloprost, subcutaneous treprostinil, and intravenous epoprostenol were noted in 283, 30, and four patients, respectively. Bosentan was the first agent used for CT in all AdCCs and iloprost was the second. Routine use of antiaggregant, anticoagulant, and pneumococcal and influenza prophylaxis were restricted in only two AdCCs. Conclusion: Our nationwide data illustrate the current status of PH regarding clinical characteristics and practice patterns. © 2017 by Turkish Society of Cardiology.Öğe Solution of the propagation of the waves in open channels by the transfer matrix method(2008) Daneshfaraz R.; Kaya B.Many problems in mechanics can be solved by the use of the transfer matrix method. The use of this method in hydraulics engineering is not widespread and only limited studies are available. In this study, linearized St. Venant equations were used and the use of transfer matrix in ocean engineering was investigated for long waves in open channels, and numerical application was carried out. The results obtained through the transfer matrix method, which is quite easy to use, program and comprehend, showed similar results obtained from the characteristics method and finite differences method. © 2008 Elsevier Ltd. All rights reserved.