Position control of a proportional valve controlled hydraulic cylinder system

Bu çalışmada simulink modeli geliştirilen oransal valf kontrollü hidrolik silindir sistemi için konum kontrolu gerçekleştirilmiştir. Bu sistemler endüstride robotlarda, takım tezgahlarında, havacılıkta uçuş ve yerçekimi simülatörlerinde ve savunma sanayinde yaygın olarak kullanılmaktadır. Bond graph modeli de verilen 4. mertebeden nonlineer sisteme, yapay sinir ağı (YSA) model temelli öngörülü kontrol uygulanarak, hidrolik silindirin konum kontrolü gerçekleştirilmiştir. Hidrolik sistem dinamiği üzerinde etkili olan piston yükü kütlesi ve hidrolik akışkanın eşdeğer hacimsel elastiklik modülü değiştirilerek, YSA model temelli öngörülü kontrolörün performansı da incelenmiştir. YSA model temelli öngörülü kontrolör, değişen sistem parametrelerine rağmen konum kontrolünü başarı ile gerçekleştirmiştir.Anahtar Kelimeler: Yapay sinir ağı, öngörülü kontrol, oransal valf, hidrolik silindir.The control of electrohydraulic systems has been the focus of powerful research over the last decades. Inherent nonlinear behaviour of the hydraulic systems makes them ideal subjects for applying different types of sophisticated controllers. In this work, a simulink model is developed of a proportional valve controlled hydraulic cylinder system. This study considers the application of neural networks to the control of a hydraulic cylinder which is driven by a proportional valve, subjected to variable reference trajectory and variable load conditions. In industrial applications, these types of systems are used widely in robotics, milling machines, in aerotics field with G and motion simulators and military applications. The system model is fully implemented in Matlab?s Simulink simulation package and model of each hydraulic component is developed and combined in a library for easy reuse. Bond graph model of the system is also developed. Applying neural network model predictive control (NNMPC) to the fourth order nonlinear system model, position control is performed. Performance of the NNMPC algorithm is also investigated by changing system parameters. Piston load and effective bulk modulus of hydraulic fluid are the most important system parameters which have valuable effects on the hydraulic system dynamics. Simulations show that, neural network model predictive control is successful for position control in spite of different values of piston load and different bulk modulus.Keywords: Neural network, predictive control, proportional valve, hydraulic cylinder

Comparison of experimental susceptibility of rainbow trout (Oncorhynchus mykiss), turbot (Psetta maxima), Black Sea Trout (Salmo trutta labrax) and Sea Bass (Dicentrarchus labrax) to lactococcus garvieae

WOS: 000348289800022Lactococcus garvieae is a major fish pathogen leads to haemorragic septicemia in many fish species. Present study was designed to determine and compare differences in susceptibilities of some important fish species to L. garvieae. Rainbow trout (Oncorhynchus mykiss), Black Sea trout (Salmo trutta labrax; synonym, Salmo coruhensis), turbot (Psetta maxima), and sea bass (Dicentrarchus labrax) were kept at different temperature ranges (12-23 degrees C) for 30 days and challenged by intraperitoneal (i.p.) injection and immersion (imm) with L. garvieae (Lgper), isolated from rainbow trout and ATCC49156 strain. Bacteria were ranged between 1.7x10(5) - 2x10(6) colonies forming unit (cfu) fish(-1) in experiments. As a result of the experiments, Lgper strain had high virulence for rainbow trout, with 98% mortality when challenged by i.p. injection. Rainbow trout and Black Sea trout tested at the lower temperature (12 degrees C) were less susceptible (max. mortality 16%) to L. garvieae. These two fish species had similar susceptibilities to L. garvieae (P>0.05). There was no mortality or any clinical signs when turbot and sea bass were challenged with L. garvieae. the results of the study generate important source in controlling of possible lactococcosis outbreaks in aquaculture industry.Central Fisheries Research Institute (CFRI)This study was supported by the Central Fisheries Research Institute (CFRI). Experimental animals were conducted in accordance with national and institutional guidelines for the protection of animal welfare. We thank to Prof. Dr. Ilhan Altinok from Karadeniz Technical University for providing L. garvieae ATCC49156. We also thank Hakan Isidan, Esen Alp, Orhan Ak and Murat Dagtekin for their assistance. This article is a part of PhD thesis of Mustafa Ture

Numerical computing approach for solving Hunter-Saxton equation arising in liquid crystal model through sinc collocation method

In this study, numerical treatment of liquid crystal model described through Hunter-Saxton equation (HSE) has been presented by sinc collocation technique through theta weighted scheme due to its enormous applications including, defects, phase diagrams, self-assembly, rheology, phase transitions, interfaces, and integrated biological applications in mesophase materials and processes. Sinc functions provide the procedure for function approximation over all types of domains containing singularities, semi-infinite or infinite domains. Sinc functions have been used to reduce HSE into an algebraic system of equations that makes the solution quite superficial. These algebraic equations have been interpreted as matrices. This projected that sinc collocation technique is considerably efficacious on computational ground for higher accuracy and convergence of numerical solutions. Stability analysis of the proposed technique has ensured the accuracy and reliability of the method, moreover, as the stability parameter satisfied the condition the proposed solution of the problem converges. The solution of the HSE is presented through graphical figures and tables for different cases that are constructed on various values of θ and collocation points. The accuracy and efficiency of the proposed technique is analyzed on the basis of absolute errors.This research has been partially supported by Ministerio de Ciencia, Innovación y Universidades grant number PGC2018-0971-B-100 and Fundación Séneca -Agencia de Ciencia y Tecnología de la Región de Murcia grant number 20783/PI/18. Also, It has been supported by the National Research Program for Universities (NRPU), Higher Education Commission, Pakistan, No. 8103/Punjab/NRPU/R and D/HEC/2017

Isolation of Citrobacter freundii from Rainbow Trout (Oncorhynchus mykiss) in Freshwater Cage

In this study, the bacteriological examination was done in case of disease suspect of rainbow trout (Oncorhynchus mykiss) which kept in cages in the Black Sea Region of Turkey. The bacterial agent was identified as Citrobacter braakii by rapid test kit (API 20E, Profile: 1704553), further identification was performed by 16S rRNA gene sequencing. Bacteria were identified as Citrobacter freundii by further molecular analysis. The antibacterial susceptibility of bacteria was also determined for 6 different antibiotics. The bacteria was sensitive to florfenicol, enrofloxacin, oxytetracycline and trimethoprim+sulfamethoxazole and resistant to erythromycin and amoxicillin-clavulanate. The most effective antibiotic was florfenicol. The disease was treated with florfenicol

Gökkuşağı alabalığı (oncorhynchus mykiss), kalkan balığı (psetta maxima),karadeniz alabalığı ( salmo trutta labrax) ve deniz levreğinin ( dicentrarchus labrax) lactococcus garvieae bakterisine karşı deneysel duyarlılıklarının karşılaştırılması

Lactoco ccus garvieae birçok balık türünde hemorajik septisemiye neden olan önemli bir balık patojenidir. Bu çalışma, bazı önemli balık türlerinin Lactococcus garvieae’ ye karşı duyarlılıklarının belirlenmesi ve karşılaştırılması amacıyla yapılmıştır. Gökkuşağı alabalığı, Karadeniz alabalığı, kalkan balığı ve deniz levreği 30 gün boyunca farklı sıcaklık aralıklarında (12 -23°C) tutularak, alabalıklardan izole edilen L. garvieae (Lgper) ve ATCC 49156 suşları ile periton içi (i.p.) ve daldırma (imm.) metotları ile dene ysel enfeksiyona tabi tutulmuştur. Deneylerde, 1,7x10 5 - 2x10 6 cfu/balık aralığında bakteri kullanılmıştır. Deneylerin sonucunda, Lgper suşunun gökkuşağı alabalıklarında %98 ölüm oranı ile yüksek virülansa sahip olduğu görülmüştür. Düşük sıcaklıkta, L. garvieae ’ye karşı test edilen gökkuşağı ve Karadeniz alabalıklarında ise ölümler düşük seviyede görülmüştür (max. mortalite %16). Bu iki balık türünün L. garvieae ’ye karşı duyarlılıkları benzer düzeyde bulunmuştur (P > 0,05). Ayrıca, L. garvieae ile enfekte e dilen kalkan balığı ve deniz levreklerinde ölüme ya da herhangi bir klinik bulguya rastlanmamıştır. Bu çalışmanın sonuçları, su ürünleri yetiştiriciliği alanında muhtemel laktokokosiz salgınlarının önlenmesi için önemli bir kaynak oluşturma potansiyeline s ahiptir.Lactoco ccus garvieae is a major fish pathogen leads to haemorragic septicemia in many fish species. Present study was designed to determine and compare differences in susceptibilities of some important fish species to L. garvieae . Rainbow trout (Onco r hynchus mykiss ), Black Sea trout (Salmo trutta labrax; synonym, Salmo coruhensis ), turbot (Psetta maxima ), and sea bass (Dicentrarchus labrax) were kept at different temperature ranges (12 -23ºC) for 30 days and challenged by intraperitoneal (i.p.) injection and immersion (imm.) with L. garvieae (Lgper), isolated from rainbow trout and ATCC49156 strain. Bacteria were ranged between 1.7x10 5 - 2x10 6 colonies forming unit (cfu) fish -1 in experiments. As a result of the experiments, Lgper strain had high virulence for rainb ow trout, with 98% mortality when challenged by i.p. injection. Rainbow trout and Black Sea trout tested at the lower temperature (1 2ºC) were less susceptible (max. mortality 16%) to L. garvieae . These two fish species had similar susceptibilities to L. ga rvieae (P>0.05). There was no mortality or any clinical signs when turbot and sea bass were challenged with L. garvieae . The results of the study generate important source in controlling of possible lactococcosis outbreaks in aquaculture industry

Şair ve tercüman Tahsin Saraç'ın hayatı

Ankara : İhsan Doğramacı Bilkent Üniversitesi İktisadi, İdari ve Sosyal Bilimler Fakültesi, Tarih Bölümü, 2017.This work is a student project of the The Department of History, Faculty of Economics, Administrative and Social Sciences, İhsan Doğramacı Bilkent University.by Özer, Abdürrahim

On the dynamical behavior of nonlinear Fitzhugh-Nagumo and Bateman-Burger equations in quantum model using Sinc collocation scheme

The main objective of this study is to numerically investigate the dynamical behavior of nonlinear Fitzhugh-Nagumo and Bateman-Burger systems through the Sinc collocation method by means of the theta-weighted scheme on various grid points of time-dependent evolutionary one spatial dimension in open quantum flow field model. The proposed technique based on the Sinc function is treated as a shape function to transform the governing nonlinear partial differential equation into an algebraic system. To approximate the time and spatial derivatives, finite difference scheme and the theta-weighted scheme have been used simultaneously due to the occurrence of infinite domain and multiple singularities. The effectiveness of the proposed results on the computational ground is illustrated graphically for better understanding and reliable performance of the design scheme is endorsed based on assessments of achieved accuracy in terms of stability analysis and convergence analysis

Caring for the Most Vulnerable: A Model for Managing Maladaptive Behavior in Children with Mental Special Needs During the COVID-19 Pandemic.

Background: This article presents the results of a comprehensive national model developed for managing maladaptive behaviors (MBs) in children with mental special needs (CMSNs) during the coronavirus disease 2019 (COVID-19) pandemic that combines telehealth-based Applied Behavioral Analyses, psychiatric interventions, and support from local psychosocial teams. This study aims to determine the effectiveness of a system that combined telehealth applications with local psychosocial support teams, allowing services from video calls to emergency interventions