A comprehensive fractal approach in determination of the effective thermal conductivity of gas diffusion layers in polymer electrolyte membrane fuel cells

The challenges in the fuel cell industry is to produce the efficient thermal and water management for accurate determination of the effectiveness thermal conductivity of gas diffusion layers (GDL) used in polymer electrolyte membrane fuel cells (PEMFC‟s). This is one of the factors affecting the durability of a fuel cell and need to get a solution to minimize costs and optimize the use of electrodes and cells. The main objectives of this research focus on the capability of the fractal approach for estimation the effectiveness of thermal conductivity of gas diffusion layer. Moreover, on this research also to propose modified fractal equations in determination of the effective thermal conductivity of GDL in PEMFCs based on previous study. Other objectives in this study are demonstrated the thermal conductivity of GDL treated with PTFE contents by using through-plane thermal conductivity experiment method. The through-plane measurement (experiment method) has been used in estimating through-plane thermal conductivity of the GDL. Thermal resistance for GDL also has been investigated under compression pressure 0.1 MPa until 1.0 MPa. In fractal equation, the determination of tortuous and pore fractal dimension can be done by using Scanning Electron Microscopy (SEM) method. Determination of effectiveness thermal conductivity using of fractal equation with slightly modified. In findings, it was found that fractal equation have been modified and measured on the GDL parameter characteristics. It was shown that the value of the effectiveness thermal conductivity of the sample using fractal approach is in good agreement with the experimental value. Finally, all the effective thermal conductivity measured by experimental and fractal approach have been determined with the variant temperature and compression pressure to show the validation result between of this two methods

End-to-end congestion control protocols for remote programming of robots, using heterogeneous networks: A comparative analysis

There are many interesting aspects of Internet Telerobotics within the network robotics context, such as variable bandwidth and time-delays. Some of these aspects have been treated in the literature from the control point of view. Moreover, only a little work is related to the way Internet protocols can help to minimize the effect of delay and bandwidth fluctuation on network robotics. In this paper, we present the capabilities of TCP, UDP, TCP Las Vegas, TEAR, and Trinomial protocols, when performing a remote experiment within a network robotics application, the UJI Industrial Telelaboratory. Comparative analysis is presented through simulations within the NS2 platform. Results show how these protocols perform in two significant situations within the network robotics context, using heterogeneous wired networks: (1) an asymmetric network when controlling the system through a ADSL connection, and (2) a symmetric network using the system on Campus. Conclusions show a set of characteristics the authors of this paper consider very important when designing an End-to-End Congestion Control transport protocol for Internet Telerobotics

System Control and Data Acquisition of University Photovoltaic Power Plant

The paper deals with design of System Control and Data Acquisition (SCADA) of Photovoltaic power plant FERIT 1, its configuration and connection with server unit for data archiving and removal approach by either android or PC devices. SCADA is developed according to ideas and need for scientific research of data generated by photovoltaic power plant built on the roof of the Faculty of Electrical Engineering, Computer Science and Information Technology Osijek in Osijek, Croatia. Designed system enables real-time analysis and of course subsequent time analyses based on storing data of high frequency measurement samples of photovoltaic (PV) power plant. The first part of the paper describes hardware components and system configuration and the second part deals with software background. Measurements of PV parameters and meteorological conditions are continuously performed, and these data are stored locally and instantaneously stored also on remote servers. Acquired measurement data is presented by graphics on developed web server platform. Developed SCADA presented in the paper is unique, adaptable open source which enables long-term performance of power plant and its components\u27 function

EL LABORATORIO DE CIENCIAS DE LA FUTURA ESCUELA. TECNOLOGÍAS Y CONTENIDOS EMERGENTES

Este artigo investiga as tendências atuais na transformação de laboratórios STEM na era da digitalização devido à integração de tecnologias digitais e ao reconhecimento da importância do desenvolvimento de habilidades metacognitivas. O artigo examina o papel da metacognição e seu impacto no processo de aprendizagem, bem como o uso de tecnologias digitais, como laboratórios remotos, laboratórios virtuais, realidade aumentada, realidade virtual e dispositivos móveis na educação STEM. Os resultados desta pesquisa sugerem que o uso dessas tecnologias digitais pode ser benéfico para a aprendizagem de ciências no ensino superior e secundário. Além disso, essas tecnologias podem ser usadas para promover o engajamento, a colaboração e o acesso dos alunos ao conhecimento científico. Além disso, a metacognição é uma habilidade importante para professores e alunos, e pode ser desenvolvida através do uso da pirâmide do conhecimento, pirâmide de inteligência emocional, pirâmide metacognitiva e modelos de pirâmide de superdotação.This paper investigates the current trends in the transformation of STEM laboratories in the age of digitization due to the integration of digital technologies and the recognition of the importance of developing metacognitive skills. The paper examines the role of metacognition and its impact on the learning process, as well as the use of digital technologies such as remote labs, virtual labs, augmented reality, virtual reality, and mobile devices in STEM education. Results from this research suggest that the use of these digital technologies can be beneficial for science learning in both higher and secondary education. Additionally, these technologies can be used to promote student engagement, collaboration, and access to scientific knowledge. Furthermore, metacognition is an important skill for both teachers and students, and can be developed through the use of the knowledge pyramid, emotional intelligence pyramid, metacognitive pyramid, and giftedness pyramid models.Este artículo investiga las tendencias actuales en la transformación de los laboratorios STEM en la era de la digitalización debido a la integración de tecnologías digitales y al reconocimiento de la importancia del desarrollo de habilidades metacognitivas. El documento examina el papel de la metacognición y su impacto en el proceso de aprendizaje, así como el uso de tecnologías digitales como laboratorios remotos, laboratorios virtuales, realidad aumentada, realidad virtual y dispositivos móviles en la educación STEM. Los resultados de esta investigación sugieren que el uso de estas tecnologías digitales puede ser beneficioso para el aprendizaje de las ciencias tanto en la educación superior como en la secundaria. Además, estas tecnologías pueden utilizarse para promover la participación, colaboración y acceso al conocimiento científico por parte de los estudiantes. Además, la metacognición es una habilidad importante tanto para profesores como para estudiantes y puede desarrollarse mediante el uso de los modelos de pirámide del conocimiento, pirámide de inteligencia emocional, pirámide metacognitiva y pirámide de talento.Este artigo investiga as tendências atuais na transformação de laboratórios STEM na era da digitalização devido à integração de tecnologias digitais e ao reconhecimento da importância do desenvolvimento de habilidades metacognitivas. O artigo examina o papel da metacognição e seu impacto no processo de aprendizagem, bem como o uso de tecnologias digitais, como laboratórios remotos, laboratórios virtuais, realidade aumentada, realidade virtual e dispositivos móveis na educação STEM. Os resultados desta pesquisa sugerem que o uso dessas tecnologias digitais pode ser benéfico para a aprendizagem de ciências no ensino superior e secundário. Além disso, essas tecnologias podem ser usadas para promover o engajamento, a colaboração e o acesso dos alunos ao conhecimento científico. Além disso, a metacognição é uma habilidade importante para professores e alunos, e pode ser desenvolvida através do uso da pirâmide do conhecimento, pirâmide de inteligência emocional, pirâmide metacognitiva e modelos de pirâmide de superdotação

WEB TABANLI SANAL GENETİK ALGORİTMA LABORATUARI

      İnternet teknolojilerindeki gelişmeler, öğrenme ihtiyaçlarının farklılaşması, bireylerin daha esnek ve kişiselleştirilmiş bir öğrenme ortamını talep etmeleri internet  tabanlı uzaktan öğretim modellerinin oluşturulmasına zemin hazırlamaktadır. Uzaktan  eğitim kendi arasında çeşitli kategorilere ayrılmakta, uzak sanal laboratuarlar da bu kategoriler arasında ele alınmaktadır. Bu çalışmada, genetik algoritmalar (GA) konusunda örnek deneyler içeren uzak sanal laboratuar uygulamalarının gerçekleştirildiği bir deney sistemi hazırlanmıştır. Genelde, GA son derece teorik derslerden biridir ve bir öğrencinin programlama dillerinden herhangi birinde GA uygulaması yazması oldukça zordur. Ayrıca, yazılmış bir programda; nüfus büyüklüğü, çaprazlama oranı, mutasyon oranı ve kodlama biçimi gibi parametrelerin en iyi değerlerini bulmak zaman alıcı bir iştir. Bu zorlu adımların gerçekleştirilmesinden sonra, öğrenciler GA’nın çalışmasını irdeleyebilmektedirler. Oysaki çalışmamızda, öğrenciler tek bir satır program kodu dahi yazmadan, İnternet üzerinden uzak sanal GA laboratuarına erişerek, GA’nın çalışma ve performansını inceleyebilmektedirler. Çalışmada; Matlab, Matlab Web Sunucu, Apache Sunucu, PHP ve Javascript gibi yazılım araçları kullanılmıştır

A Fully Integrated Open Solution for the Remote Operation of Pilot Plants

Nowadays remote access to systems in the instrumentation and measurement fields is both a reality and a challenge. There is a growing interest in replacing manual actions performed on site by remote actions carried out from anywhere around the world. To do that, besides the availability of suitable communication networks, it is necessary for the elements involved in the network to recognize each other, this latter task perhaps being the most complex one of the two. Integrating different hardware/software from different manufacturers into a single system with controlled remote access is not a trivial task. This paper presents a fully integrated open solution for the operation of pilot plants (scaled down, laboratory level industrial plants operated in university and other environments) using open access hardware/software on public networks. The proposed solution is independent of the nature of the pilot plant and its elements and can therefore be considered standard. In order to illustrate the capabilities of the proposed solution, two different types of pilot plant are presented

Design and implimentation of a supervisory safety controller for a 3DOF helicopter

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2004.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Includes bibliographical references (p. 79-80).This research effort presents the design and implementation of a supervisory controller for a 3DOF helicopter. This safety critical system is used in undergraduate laboratories in the Department of Aeronautics and Astronautics at MIT. There already exists a framework for designing a supervisory safety controller for motions about one axis. It is based on an analytical description of the safety region in state space. However, this framework cannot be easily extended to more complicated systems such as a 3DOF helicopter. In this thesis we present a different approach which uses a real-time simulation of linearized plant dynamics with a feedback law to ensure the system's safety. We describe the development of the system model, the design and implementation of the supervisory safety controller, integration of the safety controller as part of a remote laboratory and its evaluation based on its performance during laboratory exercises.by Mariya A. Ishutkina.S.M

Videoconference teaching for applied engineering technology students

Presented at the 2006 Annual ASEE Conference, June 21, 2006 - Chicago, Illinois.The development of a fully-interactive videoconference teaching facility for Applied Engineering Technology (AET) students is described in this work. This facility will provide greater program delivery flexibility by offering a non-traditional educational approach that expands student’s horizons. The new facility will allow all AET students at Drexel, as well as students at remote locations, to participate in the same educational and training process. By expanding training opportunities to students who might not otherwise take advantage of them, due to distance and time, this facility helps reduce the shortage of trained specialists in applied electrical, mechanical, and manufacturing technology. The videoconference teaching courses will be designed for undergraduate AET students and may also be taken by other undergraduate/graduate students at Drexel or by the students of other universities and community colleges who have fulfilled the necessary prerequisites and desire to pursue a BS degree in AET. The inter-institutional class sessions will be carried out utilizing Internet II-based access to high-end video and test equipment of Drexel’s AET electrical, electronics, and manufacturing laboratories. Through remote operation, expensive equipment of the AET laboratories, such as the electronics laboratory, nondestructive evaluation of materials laboratory, and web-enabled robotic assembly station, will be accessible to institutions that cannot afford the equipment directly and which do not have faculty with the expertise and training in these specific AET areas