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NASA Technical Reports Server

NASA Technical Reports Server
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HathiTrust Digital Library | Millions of books online ERIC – World’s largest digital library of education literature Incorrect Lift Theory There are many theories of how lift is generated. Unfortunately, many of the theories found in encyclopedias, on web sites, and even in some textbooks are incorrect, causing unnecessary confusion for students. The theory described on this slide is one of the most widely circulated, incorrect explanations. The theory can be labeled the "Longer Path" theory, or the "Equal Transit Time" theory. The theory states that airfoils are shaped with the upper surface longer than the bottom. Before considering what is wrong with this theory, let's investigate the actual flow around an airfoil by doing a couple of experiments using a Java simulator which is solving the correct flow equations. Due to IT security concerns, many users are currently experiencing problems running NASA Glenn educational applets. <p> This interactive Java applet shows flow going past a symmetric airfoil. Let's use the information we've just learned to evaluate the various parts of the "Equal Transit" Theory. Activities:

Study on an automatic sorting system for Date fruits Abstract In the present study, a machine vision based, online sorting system was developed, the aim being to sort Date fruits (Berhee CV.) based at different stages of maturity, namely Khalal, Rotab and Tamar to meet consumers’ demands. The system comprises a conveying unit, illumination and capturing unit, and sorting unit. Keywords Date fruit; Image processing; Khalal; Maturity; Sorting; Rotab and Tamar 1. Date is one of the non-oil export products of Iran that can play an important role in the country’s economy. Ripening process of the Date includes four principle stages, namely; Kimri (immature), Khalal (changing color, not mature), Rotab (mature) and Tamar (ripe) stages. In the present article, a new color space for grading Date fruit is proposed based on maturity stages. i. Grading Dates according to consumer desire, ii. separating Khalal from other Date fruits to avoid its deterioration due to the enzymatic activity of Khalal, and iii. 2. 2.1. 2.2. 2.3. 2.4. 2.5. 3. Table 1. Table 2.

WorldWideScience UNFORBI Agricultura Agrovoc Tesauro estructurado multilingüe que abarca todos los campos temáticos de la Agricultura, la Silvicultura, la pesca y la seguridad alimentaria así como sus y dominios asociados. Desarrollado por la Organización de las Naciones Unidas para la Alimentación y la Agricultura (FAO) y la Comisión de Comunidades Europeas, es actualizado por la FAO aproximadamente cada tres meses. Arquitectura, arte y urbanismo Canadian Thesaurus of Construction Science and Technology Tesauro creado por IF el grupo de investigación, universidad de Montreal para el gobierno de Canadá, departamento de la industria y del comercio. Tesauro de Arte & Arquitectura (acceso 31/07/06) Tesauro de Urbanismo (acceso 31/07/06) The Art & Architecture Thesaurus Foskett, A. Arqueología Tesauro Regional Arqueológico (acceso 31/07/06) Ciencias Astronomy Thesaurus Index. Derecho Generales Historia Medicina

SWR Warum? Fliegen 4 / 1 Reisen mit dem Flugzeug sind heute nichts Außergewöhnliches mehr. Trotzdem hat das Fliegen nichts von seiner Faszination eingebüßt. Seit der Antike hatte man versucht, den Vögeln nachzueifern. Erst gegen Ende des 18. Kraniche und Segelflieger (© dpa und Schempp-Hirth Flugzeugbau) Mühseliges Ausprobieren brachte erste Fortschritte. Klar war, dass ein genügend großer Flügel den so genannten Auftrieb erzeugt. Im Wesentlichen wirken am Flugzeug vier Kräfte: Das Gewicht zieht es nach unten, der Auftrieb hält es in der Luft. Kein Auftrieb im Vakuum Wir sind umgeben von Luft. Ohne Luft kann es keinen Auftrieb an einem Flugzeugflügel geben.

Robot co-active learning adjusts to context-driven user preferences Researchers at the Cornell University created an algorithm which enables robots to “coactively learn” from humans and make adjustments while an action is in progress. Their approach relies on a combination of machine learning, object and user association, and trajectory adjustment could allow robots to operate more reliably when it comes to object manipulation and safety during human-robot interaction. Assembly lines relying on robots usually have many marks and warnings in assembly areas to increase the safety of people that might be inside them while robots are working. However, most of these robots perform their tasks in memorized routines and accidents do occur. Aside safety, robots being developed to serve as aid in our homes have another set of problems, ranging from handling objects according to their properties, to safety when it comes to their movement or tool handling. The researchers used their algorithm on a Baxter robot from Rethink Robotics.

PLoS: Publication List The range of PLOS titles is expanding and now includes a number of new websites. Below, we describe the role of each group of products and how they fit together to support our mission of leading a transformation in research communication. Original Content These titles vary in the speed of publication, the nature of the peer review and selection process that takes place ahead of publication, and the breadth and nature of content that is published. The PLOS Suite of Journals: - PLOS Biology - PLOS Medicine - PLOS Genetics - PLOS Computational Biology - PLOS Pathogens - PLOS Neglected Tropical Diseases PLOS Currents PLOS Blogs Organization of Content We are also exploring new ways to organize content after publication with PLOS Collections.

EASA - Certification Specifications The Agency has consulted interested parties on Certification Specifications in accordance with the provisions of the rulemaking procedure. The rules issued by the Agency , together with related documentation , are posted on this page. Navigate through the contents: CS-22 (Sailplanes and Powered Sailplanes) Current Issue CS-22/Initial Issue (14/11/2003) CS-23 (Normal, Utility, Aerobatic and Commuter Aeroplanes) CS-23/2 Corrigendum (28/09/2010) CS-23/Initial Issue (14/11/2003) CS-25 (Large Aeroplanes) CS-25/14 (published: 19/12/2013) CS-25/13 (published: 17/06/2013) CS-25 is not amended following this Decision CS-25 is not amended following this decision CS-25/Initial Issue (17/10/2003) CS-27 (Small Rotorcraft) CS-27/Initial Issue (14/11/2003) CS-29 (Large Rotorcraft) CS-29/Initial Issue (14/11/2003) CS-31GB (Gas Balloons) CS-31GB/Initial Issue (12/12/2009) CS-31HB (Hot Air Balloons) CS-31HB/Initial Issue (27/02/2009) CS-31TGB (Tethered Gas Balloons) CS-31TGB/Initial Issue (publication date: 04/07/2013)

Industry 4.0: Agility in production? | Bosch ConnectedWorld Blog Industry 4.0 is paving the way for a social and technological revolution that will drastically change the entire industrial landscape. Why 4.0? As since the 18th century, when the first Industrial Revolution began, it is the fourth wave of major technological changes. There is brand new video footage available from the German Engineering Association VDMA featuring different Industry 4.0 projects of players such as the German Research Center for Artificial Intelligence, Bosch, SAP, Siemens as well as Wittenstein. What this video shows: Industry 4.0 is a sophisticated approach changing the entire global value chain: communication, planning, logistics and production. Actually, Industry 4.0 is a paradigm shift. Direct link to the video “Industry 4.0 – The Technological Revolution continues!” The video brings up some good points and challenges for industry: How can humans get better support for their work in the factory? What does Industry 4.0 mean for Bosch?

Open Science and Crowd Science: Selected Sites and Resources Open Science and Crowd Science: Selected Sites and Resources Diane (DeDe) Dawson Natural Sciences Liaison Librarian University of Saskatchewan Saskatoon, Saskatchewan, Canadadiane.dawson@usask.ca Copyright 2012, Diane (DeDe) Dawson. Used with permission. Table of Contents IntroductionOpen ScienceCrowd ScienceMethods and ScopeOpen Science - Definitions and PrinciplesOpen Science - Open Lab Notebooks of Individuals and Lab GroupsOpen Science - BlogsCrowd Science - Projects for Individuals or Small TeamsCrowd Science - Volunteer Distributed Computing ProjectsThe Main SoftwareOrganizationsSelected ProjectsFurther Sources for ProjectsSelected Examples of Collaborative Science Sites for SpecialistsMain Software & Online Tools for Open ScienceOpen Science Conferences and CommunityConferencesFurther Reading/ViewingVideosDeclarations, Reports and White PapersOpen e-BooksSelected Essays, Articles, and InterviewsReferences Introduction Open Science Crowd Science Methods and Scope Open Science - Blogs

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