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Potkonjak V.,University of Belgrade | Vukobratovic M.,Institute M Pupin | Jovanovic K.,University of Belgrade | Medenica M.,Technical College
Computers and Education | Year: 2010

The implementation of the distance learning and e-learning in technical disciplines (like Mechanical and Electrical Engineering) is still far behind the grown practice in narrative disciplines (like Economy, management, etc.). This comes out from the fact that education in technical disciplines inevitably involves laboratory exercises and this fact drastically increases the complexity of a potential e-learning system. New approach and new specific knowledge are needed to develop such a system. We expect to meet the requirements of distance learning by developing the software-based laboratory exercises, i.e., a virtual laboratory. To fully substitute a physical system like laboratory equipment, one must emulate its full dynamics. The mathematical model in the form of differential equations will be applied to calculate dynamics and provide the data that would otherwise be measured on a physical system - this means simulation. To prove the feasibility of the concept and make a step towards full e-learning in technical disciplines, we consider a complex technical field, Mechatronics and more precisely, Robotics being a perfect symbiosis of Mechanical and Electrical Engineering. We present the Virtual Laboratory for Robotics (VLR). It possesses all the necessary features of a virtual laboratory: user interface, simulator, and visualization. © 2010 Elsevier Ltd. All rights reserved. Source

Dimitrov M.S.,Technical College
Journal of the Balkan Tribological Association | Year: 2011

This paper treats the problems connected with microgeometry change for crankshaft and connecting rod bearing shells at accelerated industrial running-in of internal combustion engines, using chemical additives in the oil medium. The change of bearing shells roughness during running-in has been studied in the presence of metal oleates as friction modifiers in motor oil SAE 30. The connecting rod and crankshaft bearing shells roughness significantly decreases at running-in in the presence of 0.3% friction modifiers in comparison with the blank sample oil. Lowest roughness and lowest profile maximum height (up to 2 times reduction) have been achieved with copper oleate, followed by zinc oleate. The larger difference in the balance roughness of connecting rod and crankshaft bearings, run-in with 0.3% copper and zinc oleate, accords with lower wear (up to 30%) at running-in and with bigger capacity of the repaired engines. Source

Bdnoiu A.I.,Polytechnic University of Bucharest | Abood Al-Saadi T.H.,Polytechnic University of Bucharest | Abood Al-Saadi T.H.,Technical College | Voicu G.,Polytechnic University of Bucharest
International Journal of Mineral Processing | Year: 2015

This study presents data regarding the synthesis of binding materials through the alkaline activation of waste glass (bottle glass cullet) with NaOH solution. As addition was used red mud, a residue resulted in bauxite processing, due to its high alkalinity and aluminum content. This paper presents the influence of processing parameters (composition of solid component, curing time and temperature) on the compressive strength and hydrolytic stability of this type of alkali activated cements. The effect of red mud addition on the hardening processes, reaction products and material's microstructure was studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermal analysis (TG & DTA). The main reaction products are sodium silicate or/and sodium silicate aluminates hydrates with amorphous to crystalline morphologies. The amount of reaction products increases with the increase of the initial curing time at 60°C and consequently it was achieved an increase of the compressive strength values. As a negative side effect the hydrolytic stability of these materials is affected by the increase of the initial curing time at 60°C. Despite the fact that addition of aluminum to sodium silicate hydrates improve their hydrolytic stability, the expected positive influence of red mud addition to the studied binding systems was not observed. This can be due to the low amount of supplementary aluminum brought in the activator solution by the red mud as well as the high amount of iron phases present also in this waste. © 2014 Elsevier B.V. All rights reserved. Source

News Article
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The ASM International Board of Trustees announces the appointment of William T. (Bill) Mahoney as Managing Director effective immediately. The appointment follows an extensive search led by the Board-appointed Executive Search Committee with the assistance of Dise & Co. Mahoney's appointment is effective immediately. Mahoney is formerly the CEO of the South Carolina Research Authority (SCRA). He held this post from August 2005 to March 2016. SCRA is a non-stock, tax-exempt applied R&D corporation, which operates under a public charter from the state of South Carolina, but is economically self-sufficient due to its business operations, and receives no state funding. Under Mahoney's leadership, SCRA annual revenues from its applied research and commercialization services operations have grown from $74M to over $455M. In this same timeframe, SCRA annual year-end backlog grew from $93M to $1091M, annual net revenues have set company records of up to 7.9%, and total contract value under management grew from $235M to over $5.2B. SCRA's financial growth has paralleled its advancing reputation within defense, security, advanced materials, and energy and sustainability market segments as a dynamic, research-based business, uniquely able to rapidly and cost-effectively apply innovative technologies to important government and corporate problem sets. In its vertical markets, SCRA today competes effectively against established entities such as Battelle, SAIC, IBM, CTC, Mitre Corp, and others. Mahoney holds a TS clearance, which was a condition of employment at SCRA. During his tenure, SCRA received national and international best practices recognition from the defense industry for its Navy Centers of Excellence, and from the State Science and Technology Institute, Southern Growth Policies Conference, International Economic Development Council, Entrepreneur Magazine, and Forbes Magazine for its SC Launch seed capital and support services programs. In 2008, Mahoney was named by Tech Journal South magazine as one of the top 25 technology leaders in the southeastern United States. In 2010, SCRA's Applied R&D Sector was chosen by The Wall Street Journal as one of America's Top 15 Winning Workplaces. SCRA was recognized as Non-Profit Corporation of the Year 2011 by the American Business Congress' "Stevie" Awards, and the same group chose Bill as Non-Profit Executive of the Year in 2012. Mahoney's peers from other industry segments in this 2012 Executive of the Year selection included Allen Mulally of Ford, and John Lundgren of Stanley Black and Decker. In 2013 and 2014, SCRA was awarded multiple "Stevie's" for national leadership in technology innovation and corporate responsibility programs. SCRA invests the net revenues of its applied R&D contracts to effect its public mission, which is the development of the knowledge economy in South Carolina. Since 2006, SCRA investment programs, including R&D infrastructure, startup equity investments, SBIR matches, grants, subcontracts, and sponsorships, have generated and deployed over $380M in cash into the SC knowledge economy. Over $100M of that investment has supported commercialization of university research and technologies. Private add-on investment of over $400M in equity capital has followed SCRA placements, and SCRA has supported or assisted over 700 SC Corporations, ranging from BMW down to over 320 early stage startups. All of these decade-long achievements have occurred without any annual state appropriations. During the roughly 30 years prior to coming to SCRA, Mahoney led companies small and large, which commercialized ″first-of-a-kind″ solutions in telecommunications, electronic publishing, automatic remote monitoring and other emerging applied systems markets, leading directly to IPO's or strategic acquisitions. Among these companies was SCT Utility Systems, of Columbia, SC. Between 1995 and 2000, SCT grew from startup to $175M annual revenues, prior to its sale to Indus International (now Ventyx Corp). SCT′s installed base of customer information systems for energy, utility, and communications companies is still one of the largest of its kind in the world. Mahoney held a non-voting seat as secretary of the SCRA Board, and also served as the chairman of SCRA's wholly-owned applied R&D affiliate, Advanced Technology International Inc. He currently serves on outside corporate boards as chairman of SCRA-invested tech startups STEM Premier and Carbon Conversions Inc. He also serves on national Boards with the National Defense Industrial Association, the National Energy Marketers Association and the Fuel Cell and Hydrogen Energy Association. On a state and local level, he serves or has served on the boards of the SC Hydrogen and Fuel Cell Alliance, Midland Technical College Foundation, and SC Economics. Mahoney is a Harvard graduate and former member of both the Harvard Crew and the U.S. National Rowing Team. He and his wife, Paula, have been married for 37 years and have two adult sons, one a U.S. Navy officer and one a professional baseball player.

Markovic S.L.,Technical College
History of Mechanism and Machine Science | Year: 2015

This paper presents the results of Tesla's work and research in the field of fountains that was accomplished and completed in 1917. In this period the inventor designed and developed five different models of table fountains. The design of one table fountain was further modified and developed resulting in four completely distinguishable versions of the same device. By exploring the original archival documents, the authors attempted to present the inventor's research in this less known field and the unknown details of his rich achievements. The authors also present CAD models based on original table fountain drawings, which are archived as a part of Tesla's legacy in the Nikola Tesla Museum in Belgrade. © 2015 Springer Science+Business Media Dordrecht. Source

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