Chowdhury I.,Aerospace |
Prasher R.,Aerospace |
ASME/JSME 2011 8th Thermal Engineering Joint Conference, AJTEC 2011 | Year: 2011
Two methods often proposed for harnessing renewable energy, photovoltaics and solar thermal, both utilize the power of the sun. Each of these systems independently present unique engineering challenges but when coupled together the challenge intensifies due to competing operating requirements. Recent research has demonstrated these hybrid systems for lowtemperature applications but there exists limited studies at higher concentration ratios, and thus higher temperatures. What these studies have shown is that keeping the PV cell temperature low keeps the overall system efficiency relatively high but results in low efficiencies from the thermal system. This study presents a unique design strategy for a hybrid PV/thermal system that only has mild thermal coupling which can lead to enhanced efficiency. By creating a fluid filter that absorbs energy directly in the fluid below the band-gap and a PV cell with a passive cooling strategy combined efficiencies greater than 38% can be achieved. Copyright © 2011 by ASME.
Microencapsulation for textile applications and use of SEM image analysis for visualisation of microcapsules [Mikrokapsuliranje za tekstilno uporabo in uporaba analize SEM posnetkov za vizualizacijo mikrokapsul]
Staresinic M.,University of Ljubljana |
Sumiga B.,Aerospace |
Sumiga B.,University of Ljubljana |
Boh B.,University of Ljubljana
Tekstilec | Year: 2011
The article presents the possibilities of using scanning electron microscopy (SEM) for the microencapsulation research purpose and for the visualisation of microcapsule applications on textiles. The laboratory and industrial scale synthesis of aminoplast microcapsules with in situ polymerisation of melamine-formaldehyde prepolymers, containing fragrances, essential oils and phase change materials (PCM) as core materials, is presented. The following properties of microcapsules were studied with the use of SEM in combination and in comparison with classical methods of microcapsule properties evaluation: (a) appearance, size and morphology of microcapsules, including the determination of wall thickness, (b) visualisation of fragrance and/or essential oils containing aminoplast microcapsules on non-woven and woven textile carriers, (c) evaluation of mechanical resistance of PCM microcapsule walls under pressure at an elevated temperature, and (d) detection of morphological changes of PCM microcapsules caused by ammonia scavenger. For graphical analyses, the processing of SEM images was performed with ImageJ software.
Sumiga B.,University of Ljubljana |
Knez E.,Aerospace |
Vrtacnik M.,University of Ljubljana |
Savec V.F.,University of Ljubljana |
And 2 more authors.
Acta Chimica Slovenica | Year: 2011
Paraffinic phase change materials (PCM) were microencapsulated by in situ polymerization of melamineformaldehyde prepolymers. Partly methylated trimethylolmelamine was used as an aminoaldehyde prepolymer for the microcapsule wall, a styrene-maleic acid anhydride copolymer as an emulsifier and modifying agent, and ammonia as a scavenger for reducing residual formaldehyde. For the determination of residual formaldehyde in a ppm concentration range, EDANA and malachite green analytical methods were studied, and the EDANA 210.1-99 was applied for the determination of residual formaldehyde in 25 samples of microcapsules, produced in a 200-L reactor. A linear correlation was observed between the added ammonia scavenger concentration and the reduction of residual formaldehyde concentration. Compared with 0.45% (4500 ppm) formaldehyde in a non-treated microcapsule suspension, with ammonia scavenger concentrations 0.80, 0.90 and 1.35%, the concentration of residual formaldehyde dropped to 0.27, 0.20 and 0.09% (i.e. 2700, 2000 and 900 ppm), respectively. Morphological characterisation of microcapsules by SEM and microcapsule wall permeability measurements by gravimetry / mass loss at an elevated temperature (135 °C) suggested that ammonia positively contributed to the wall elasticity / durability, while microcapsules with no ammonia scavenger added tended to have more brittle walls, and were more prone to cracking.
News Article | December 1, 2016
MarketStudyReport.com adds “Global Aerospace 3D Printing Market 2016-2020” new report to its research database. The report spread across 57 pages with table and figures in it. The research analysts forecast the global aerospace 3D printing market to grow at a CAGR of 55.85% during the period 2016-2020. About Aerospace 3D Printing 3D printing manufacturing refers to the process of synthesizing successive layers of materials with the support of computerized control technology to create an object or component. This process empowers manufacturers to produce small and micro-components of almost any shape or size. It also allows the manufacturers to reduce the overall weight of the components, thus substantially reducing the overall weight of an aircraft. This innovative printing method allows cost-efficient and just-in-time (JIT) manufacturing of parts. It also permits quick design and rapid changes of internal features of the components, which would not be possible with traditional manufacturing methods. Covered in this report The report covers the present scenario and the growth prospects of the global aerospace 3D printing market for 2016-2020. To calculate the market size, the report considers the revenue generated in the overall market from the procurement of aircraft components and subsystems that are manufactured using 3D printing technology. The market is divided into the following segments based on geography: Americas APAC EMEA Research report, Global Aerospace 3D Printing Market 2016-2020, has been prepared based on an in-depth market analysis with inputs from industry experts. The report covers the market landscape and its growth prospects over the coming years. The report also includes a discussion of the key vendors operating in this market. Browse full table of contents and data tables at https://www.marketstudyreport.com/reports/global-aerospace-3d-printing-market-2016-2020/ Key vendors Airbus Boeing GE Honeywell International Rolls-Royce Other prominent vendors AERIA Luxury Interiors JBRND Moog MTU Aero Engines Norsk Titanium Pratt & Whitney Market driver Convenience in printing larger components. For a full, detailed list, view our report Market challenge Convenience in printing larger components. For a full, detailed list, view our report Market trend Influence of 3D printing on aircraft interiors. For a full, detailed list, view our report Key questions answered in this report What will the market size be in 2020 and what will the growth rate be? What are the key market trends? What is driving this market? What are the challenges to market growth? Who are the key vendors in this market space? What are the market opportunities and threats faced by the key vendors? What are the strengths and weaknesses of the key vendors? To receive personalized assistance, write to us @ [email protected] with the report title in the subject line along with your questions or call us at +1 866-764-2150
Hashmi U.S.,Bahria University |
Anjum N.,Aerospace |
Israr A.,Bahria University
Proceedings of International Conference on Computational Intelligence, Modelling and Simulation | Year: 2013
The Global software industry worth about $293 billion in 2011 is plagued by an ironic fact that a huge proportion of the software projects are below their schedules or are not completed due to bad planning, poor specification of software product specifications and technical inadequacies. The concept of software quality management is gaining increasingly more and more popularity as software firms now prefer the use of quality assurance practices to provide software products that are more reliable and efficient. This paper aims to augment earlier research conducted relating to software quality assurance practices and identifies any link between customer satisfaction and optimization of costs associated with the development and maintenance of software products. The gathered data from Clients and development teams is analyzed in SPSS tool to measures the impact of implementing Software Quality Standards on Customer Satisfaction through variations in Product Development Time and Product Safety. © 2013 IEEE.
Wollschlager J.A.,Aerospace |
Yancey R.N.,Aerospace |
Asaker R.,E Xstream Engineering |
Jeunechamps P.-P.,E Xstream Engineering |
And 4 more authors.
Proceedings of the American Society for Composites - 30th Technical Conference, ACS 2015 | Year: 2015
A number of structural optimization methods have been applied over the years to aid in the design process for structural components. The design criteria are often based on stress, strain, or displacement allowables which can be easily calculated with any finite element analysis model. For composites, the design criteria are often based on more detailed failure models at the constituent level which attempt to evaluate interlaminar shear and tension, matrix crazing and shear yielding, and fiber fracture. This paper looks at methods to be able to incorporate advanced composite failure models, including commercial codes and in-house proprietary models, into the optimization process to further improve the optimization results. A few case studies will be reviewed with a discussion on the challenges and potential solutions to incorporating these methods in a simple and efficient manner. Copyright © 2015 by DEStech Publications, Inc. and American Society for Composites. All rights reserved.
Pan H.,Aerospace |
Jing Z.,Aerospace |
Lei M.,Aerospace |
Liu R.,Aerospace |
And 2 more authors.
Neurocomputing | Year: 2013
It is a challenging task to recover a high quality image from the degraded images. This paper proposes a fast image deblurring algorithm. To deal with the limitations of the proximal Newton splitting scheme, a sparse framework is presented, which characterized by utilizing the sparse pattern of the approximated inverse Hessian matrix and relaxing the original assumption on the constant penalty parameter. The proposed framework provides a common update strategy by exploiting the second derivative information. To alleviate the difficulties introduced by the sub-problem of this framework, an approximate solution to the weighted norm based primal-dual problem is derived and studied. Moreover, its theoretical aspects are also investigated. Compared with the state-of-the-art methods in several numerical experiments, the proposed algorithm demonstrates the performance improvement and efficiency. © 2013.
Babu S.S.,Aerospace |
Babu S.S.,Oak Ridge National Laboratory
PTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015 | Year: 2015
This paper pertains to non-equilibrium solid-solid phase transformation during dynamic thermal conditions typical to that of welding and additive manufacturing processes. Need for measurement of these phenomena using in-situ and ex-situ characterization tools, as well as, prediction using computational modeling is highlighted with two examples. In the first example, kinetics of dissolution and growth of M23C6 during normalizing, welding and post-weld heat treatment in Cr-Mo steels is discussed. In the second example, growth and dissolution of γ' and γ" within g phase in an Inconel 718 alloy during laser additive manufacturing will be discussed.