Sandviç Kompozit Plaka Üzerinde Aktif Titreşim Kontrolü Amacıyla Kullanılacak Piezoelektrik Yamaların Yerlerinin Belirlenmesi

Konferans Bildirisi -- Teorik ve Uygulamalı Mekanik Türk Milli Komitesi, 2015Conference Paper -- Theoretical and Applied Mechanical Turkish National Committee, 2015Ağırlık, Havacılık ve Uzay Mühendisliği uygulamalarında en önemli sorunlardan biridir. Bu sorunun üstesinden gelmek için sandviç kompozit yapılar tasarlanmaktadır. Sandviç yapılar bu ağırlık problemini çözerken, aynı zamanda daha pürüzsüz bir yüzey, malzeme yorgunluğuna dayanım ve artan bir mukavemet de sağlamaktadır. Ancak, ince plaka tipi yapılar titreşim problemleri ortaya çıkmaktadır. Bu titreşim problemlerine karşı en etkili çözüm olarak aktif titreşim kontrolü söylenebilir. Eyleyici ve algılayıcılar doğru yerleştirildiği sürece aktif titreşim kontrolü titreşim bastırmada çok güçlü bir yöntemdir. Yanlış konumlar, performans düşüklüğüne ve hatta kontrolün imkansızlaşmasına yol açabilirler. Bu çalışmada, sonlu elemanlar modelleme ve analiz metotları kullanılarak, piezoelektrik eyleyici ve algılayıcıların yerleri belirlenmiştir [1].Weight is one of the most important problems in Aerospace Engineering applications. To overcome this problem, sandwich composite materials are designed. Sandwich materials solve this weight problem while having a smoother surface, fatigue resistance and increasing strength. However, thin plate-like structures have vibration problems. The most effective solution to the vibration problems can be said as active vibration control. Active vibration control is a powerful way of vibration suppression as long as the actuators and sensors are located correctly. Improper locations may lead to lose in the control performance; in fact, control can be impossible. In this paper, locations for piezoelectric actuators and sensors are determined using finite element modelling and analyses methods

Determination of Direct and Indirect Effects on Milk Yield of Anatolian Buffaloes Using Path Analysis

This study aimed to determine the direct and indirect effects of the independent variables presented by the lactation length (LL), age of calving (CAGE), and daily milk yield (DMY) on the dependent variable of lactation milk yield (LMY) in Anatolian buffaloes. In this study, 3761 LMY records of the 834 Anatolian buffaloes calving between 2012 and 2017 in Tokat province and around were used as the research material. In the study, the simple correlation coefficients between the dependent variable of LMY and independent variables were determined to be positive and significant (P[removed

Lornoxicam use to reduce the pain associated with propofol injection

Aim: To investigate the efficacy of lornoxicam in the prevention of the pain associated with propofol injection.Material and method: Approval for this study was granted by the ethics committee of our hospital. Using a computer randomisation software, 120 patients undergoing elective surgery were assigned to four equal groups. In Group I (control group), immediately before anaesthesia induction, 10 ml of isotonic 0.9% NaCl solution (placebo) was administered intravenously (IV). In Groups II, III and IV, the same injection contained 2 mg, 4 mg and 8 mg of lornoxicam respectively. A tourniquet was then applied to the forearm for two minutes. Pain evaluation was made using a verbal pain score.Results: Differences in pain severity scores were statistically significant between Groups I and II, Groups I and III, Groups I and IV and between Groups II and III (p < 0.05). However, no significant difference was determined between Groups III and IV (p = 0.401).Conclusion: In all groups administered with lornoxicam, there was a significant reduction in the severity of pain associated with propofol injection, in comparison with the control group. Maximum effect is obtained with a dose of 4 mg

Fatty acid profilies and some meat quality traits at different slaughter weights of Brown Swiss bulls

This research was done to detect some meat quality traits and tissue fatty acid combination of the longissimus dorsi thoracis (LT) muscle of Brown Swiss bulls at the different slaughter weights (SW). The animal material of the study comprised 20 Brown Swiss bulls. In the study, Brown Swiss bulls were divided into two groups according to their SW as low (LSW (n = 10); 431–503 kg) and high (HSW (n = 10); 504–583 kg). In the study, the LSW group showed the lowest final pH value (pHF) (5.44) (P 0.05). In the research, the differences observed between the SW groups considering a* (redness) and C (chroma) values were found significant (P 0.05). Freeze–thaw loss (FL) and ether extract (PEE) were found 4.35% and 1.01% higher, respectively, in the HSW group than the LSW group (P 0.05) in the LT muscle decreased with the increase of SW. As a result, when LSW and HSW slaughter weight groups were evaluated considering the water losses causing financial losses in meat and fatty acids having beneficial effects on human health, it was seen that the LSW group came to the fore. © 2021, The Author(s), under exclusive licence to Springer Nature B.V

The importance of perfusion index monitoring in evaluating the efficacy of stellate ganglion blockage treatment in Raynaud’s disease

Stellate ganglion blockage (SGB) is a method used for treating Raynaud’s phenomenon (RP). This study primarily aimed to determine whether the perfusion index (PI) can be used an alternative to Horner’s signs in evaluating the efficacy of SGB in patients diagnosed with RP. In a total of 40 patients, aged 18–65 years and diagnosed with primary RP, SGB was applied for 5 days on the same side with the 2-finger method, using 6 mL of 5% levobupivacaine at the 7th cervical vertebra level. The PI values were recorded from the distal end of the 2nd finger of the upper extremity on the side applied with the block at baseline and at 5, 15, 30, 60 and 120 min. The onset time of Horner findings was recorded. The PI values and visual analogue scale (VAS) pain scores were recorded pre-treatment and after 2 weeks.When the PI values of the 40 patients were examined, a 62.7% increase was observed from baseline to the first session at 5 min (p < 0.05). When all sessions were evaluated, a statistically significant increase was determined in the PI values measured at 5, 15, 30, 60 and 120 min compared with the baseline PI values. There was a statistically significant decrease in the post-treatment VAS pain scores and a statistically significant increase in the post-treatment PI values (p < 0.05). By eliminating peripheral vasospasm with the application of SGB in patients with RP, the distal artery blood flow and PI are increased. PI measurement is a more objective method and therefore could be used as an alternative to Horner findings in evaluating the success of SGB. PI is a non-invasive and simple measurement and also an earlier indicator in evaluating the success of SGB than Horner’s signs.Keywords: Raynaud’s phenomenon; perfusion index; stellate ganglion blockage; pain; Horner's sig

Corchorus olitorius L. (Jute) leaf and seed extracts exerted high antibacterial activity against food and plant pathogenic bacteria

Aim of this study was to comparatively evaluate antibacterial activities of methanol (MetOH), acetone (Ace), petroleum ether (PE) and aqueous (dw) leaf (L), root (R), and seed (S) extracts of Corchorus olitorius L. on both food- and plant-borne pathogens, with DPPH radical scavenging activities (DRSA), and quantitative and qualitative constituent analysis. Leaf PE has the highest strain susceptibility on both food- and plant-borne pathogens. Clavibacter michiganensis, Pseudomonas tomato, and Erwinia caratovora were susceptible to nearly all the leaf and seed extracts. Very low minimum inhibitory concentration (8-128 mL(-1)) and minimum bactericidal concentration (32-2048 mu g mL(-1)) were determined for both leaf and seed extracts against C. michiganensis. Total phenolic contents were correlated to DRSA. The phenolic compounds tested were higher in the leaf MetOH, cholorogenic acid being the most abundant one. Palmitic acid was determined in leaf PE and seed PE extracts. Results presented here demonstrate high antibacterial activity of C. olitorius leaf seed extracts against phytopathogens for the first time, and provide the most comprehensive data on the antibacterial activity screening against food-borne pathogens. Considering limitations in plant disease control, antibacterial activities of these extracts would be important in plant disease control.Baskent University Research Fund; Baskent University Institutional Review Board [DA10/17]This study was approved by Baskent University Institutional Review Board (Project no: DA10/17), and supported by Baskent University Research Fund

Masseter Muscle Thickness and Maxillofacial Morphology - A Pilot Study

The aim of this study was to investigate how the thickness of the masseter muscle relates to the maxillofacial morphology, including the thickness of alveolar process in the mandibular incisor region, and the thickness of the mandibular symphysis. The subjects consisted of 25 volunteers of whom consisted of 17 females and 8 males (mean age: 21 years 3 months). The relationship between masseter muscle thickness and the maxillofacial skeleton was investigated by measuring the former by ultrasonograpy and the latter by roentgenographic cephalometry. Five angular and ten linear measurements were traced. The data were analysed using multiple regression analysis. According to the present study, the masseter muscle thickness was 9.7±1.6mm in the relaxed state and 12.5±1.7mm during clenching. The results of the multiple regression analysis showed that masseter muscle thickness in the clenching state was only significantly correlated with the “ramus inclination to SN” angle (p<0.05). Therefore it is suggested that the limited masticatory forces dont influence the maxillofacial morphology

Programlama Öğretimi için Bir Model Önerisi: Yedi Adımda Programlama

There are a number of studies in the literature revealing that programming instruction has positive effects on development of different cognitive skills. However, there are scarcely any studies suggesting pedagogical approaches to how programming should be done. Therefore, this study focused on how to do programming instruction that target developing students’ cognitive skills. In this study, it was aimed to suggest a model for teaching in order to develop various cognitive skills of students. Within the scope of the study, a programming instruction model was created, and it was called Programming in Seven Steps (PSS) model. As research design, special case study was used from qualitative research methods. The research team consisted of two groups: design team (1 faculty member from the department of Computer Education and Intructional Technologies (CEIT), 2 master’s degree students, and 2 PhD students) and a Design Evaluation Team (DET) (10 IT and Software teachers who work in secondary schools affiliated to the Ministry of National Education) in the process of constructing the PSS model. During the research, the documents and interviews with the design evaluation team were analyzed with the purpose of determining the steps of the PSS model. The study elaborates the process followed to create the model, the features of the proposed model, and interviews with the design evaluation team. This article details the overall path to designing of the model, the features of the model, and DET interviews. It is aimed that the model introduced in this study will become a guide for educators who want to teach programming at secondary school level.Alanyazında programlama öğretiminin pek çok bilişsel beceriye olumlu etkilerini ortaya koyan çalışmalar yer almaktadır. Buna karşın programlama öğretiminin sistematik bir şekilde gerçekleştirilebilmesi amacıyla pedagojiye yönelik çalışmalar oldukça sınırlı sayıdadır. Bu nedenle çalışmada, öğrencilerin bilişsel becerilerinin gelişimine yönelik bir programlama öğretiminin nasıl yapılması gerektiği üzerine odaklanılmıştır. Çalışmanın amacı; Programlama öğretimi sürecinde öğrencilerin çeşitli bilişsel becerilerinin gelişimini sağlamak amacıyla kullanılabilecek bir öğretim modeli önerisinde bulunmaktır. Çalışma kapsamında, oluşturulan programlama öğretimi modeline Yedi Adımda Programlama (YAP) modeli adı verilmiştir. Araştırma deseni olarak nitel araştırma yöntemlerinden özel durum çalışması kullanılmıştır. Araştırmanın, YAP modelinin oluşturulması aşamasında araştırma grubunu tasarım ekibi (1 BÖTE öğretim üyesi ile 2 yüksek lisans, 2 doktora öğrencisi) ve tasarım değerlendirme ekibi (MEB’e bağlı ortaokullarda görevli 10 Bilişim Teknolojileri ve Yazılım Dersi öğretmeni) oluşturmaktadır. Araştırma süreci boyunca YAP modeli adımlarının belirlenmesi amacıyla doküman analizi ve tasarım değerlendirme ekibi ile yapılan görüşmelerin analizi gerçekleştirilmiştir. Bu çalışmada, modelin oluşturulması için izlenen süreç, oluşturulan modelin özellikleri ve tasarım değerlendirme ekibi ile yapılan görüşmelere yer verilmiştir. Bu çalışma ile ortaya konulan modelin, ortaokul düzeyinde programlama öğretimi yapmak isteyen eğitimciler için yol gösterici olması hedeflenmektedir

Comparison of diferent lactation curve models of Anatolian Bufaloes

Bu araştırmada, farklı işletme koşullarında 2011-2013 yılları arasında yetiştirilen Anadolu mandalarına ait kontrol günü süt verim kayıtları kullanılarak sekiz farklı laktasyon eğrisi modeli karşılaştırılmıştır. Bu amaçla, laktasyon eğrisinin tanımlanmasında Wood, Cobby ve Le Du, Üssel, Parabolik Üssel, Kuadratik, Ters Polinomiyal, Logaritmik Kuadratik, Logaritmik Linear modelleri kullanılmıştır. Laktasyon eğrisini en iyi tanımlayan modeli belirlemek için belirtme (R2) ve kalıntı standart sapma (KSS) katsayıları kriter olarak kullanılmıştır. En yüksek R2 ve en düşük KSS değerlerini veren Logaritmik Kuadratik ve Kuadratik modellerin en iyi uyumu gösteren modeller olduğu belirlenmiştir. Sonuç olarak, Logaritmik Kuadratik veya Kuadratik modeller ile tahmin edilen parametrelerin ıslah çalışmalarında kullanılması, bu yönde yapılacak araştırmalara önemli katkı sağlayacaktır.In this study, eight diferent lactation curve models were compared by using test day milk yield records belonging Anatolian Bufaloes raised in diferent Farm conditions between 2011 and 2013. To identify the best lactation curve models of Wood, Cobby and Le Du, Logaritmic Quadratic, Exponential, Parabolic exponential, Quadratic, Inverse Polynomial and Logaritmic Linear mathematical functions were used. The coefficient of determination (R2) and residual standard deviation (RSD) statistics were used for determination of best fitted model in lactation curve. Logaritmic Quadratic and Quadratic functions are the best goodness of fit model as having the highest R2 and lowest RSD coefficients. As a result, the parameters are estimated by logarithmic quadratic or quadratic models, for use in breeding programs will make an important contribution to research in this field