519 research outputs found
Smart Materials and Devices for Energy Harvesting
This book is devoted to energy harvesting from smart materials and devices. It focusses on the latest available techniques recently published by researchers all over the world. Energy Harvesting allows otherwise wasted environmental energy to be converted into electric energy, such as vibrations, wind and solar energy. It is a common experience that the limiting factor for wearable electronics, such as smartphones or wearable bands, or for wireless sensors in harsh environments, is the finite energy stored in onboard batteries. Therefore, the answer to the battery “charge or change” issue is energy harvesting because it converts the energy in the precise location where it is needed. In order to achieve this, suitable smart materials are needed, such as piezoelectrics or magnetostrictives. Moreover, energy harvesting may also be exploited for other crucial applications, such as for the powering of implantable medical/sensing devices for humans and animals. Therefore, energy harvesting from smart materials will become increasingly important in the future. This book provides a broad perspective on this topic for researchers and readers with both physics and engineering backgrounds
Index to NASA Tech Briefs, 1975
This index contains abstracts and four indexes--subject, personal author, originating Center, and Tech Brief number--for 1975 Tech Briefs
NASA Tech Briefs, May 1991
Topics: New Product Ideas; NASA TU Services; Electronic Components and Circuits; Electronic Systems; Physical Sciences; Materials; Computer Programs; Mechanics; Machinery; Fabrication Technology; Mathematics and Information Sciences; Life Sciences
Small business innovation research. Abstracts of completed 1987 phase 1 projects
Non-proprietary summaries of Phase 1 Small Business Innovation Research (SBIR) projects supported by NASA in the 1987 program year are given. Work in the areas of aeronautical propulsion, aerodynamics, acoustics, aircraft systems, materials and structures, teleoperators and robotics, computer sciences, information systems, spacecraft systems, spacecraft power supplies, spacecraft propulsion, bioastronautics, satellite communication, and space processing are covered
NASA Tech Briefs, October 2001
Topics include: special coverage section on composites and plastics, electronic components and systems, software, mechanics, physical sciences, information sciences, book and reports, and a special sections of Photonics Tech Briefs and Motion Control Tech Briefs
NASA SBIR abstracts of 1992, phase 1 projects
The objectives of 346 projects placed under contract by the Small Business Innovation Research (SBIR) program of the National Aeronautics and Space Administration (NASA) are described. These projects were selected competitively from among proposals submitted to NASA in response to the 1992 SBIR Program Solicitation. The basic document consists of edited, non-proprietary abstracts of the winning proposals submitted by small businesses. The abstracts are presented under the 15 technical topics within which Phase 1 proposals were solicited. Each project was assigned a sequential identifying number from 001 to 346, in order of its appearance in the body of the report. Appendixes to provide additional information about the SBIR program and permit cross-reference of the 1992 Phase 1 projects by company name, location by state, principal investigator, NASA Field Center responsible for management of each project, and NASA contract number are included
Conference on Thermal Issues in Machine Tools: Proceedings
Inhomogeneous and changing temperature distributions in machine tools lead to sometimes considerable quality problems in the manufacturing process. In addition, the switching on and off of aggregates, for example, leads to further fluctuations in the temperature field of machine tools. More than 100 specialists discussed these and other topics from the field of thermal research at the 1st Conference on Termal Issues in Machine Tools in Dresden from 22 to 23 March.:Efficient modelling and computation of structure-variable thermal behavior of machine tools
S. Schroeder, A. Galant, B. Kauschinger, M. Beitelschmidt
Parameter identification software for various thermal model types
B. Hensel, S. Schroeder, K. Kabitzsch
Minimising thermal error issues on turning centre
M. Mareš, O. Horejš, J. Hornych
The methods for controlled thermal deformations in machine tools
A. P. Kuznetsov, H.-J. Koriath, A.O. Dorozhko
Efficient FE-modelling of the thermo-elastic behaviour of a machine tool slide in lightweight design
C. Peukert, J. Müller, M. Merx, A. Galant, A. Fickert, B. Zhou, S. Städtler, S. Ihlenfeldt, M. Beitelschmidt
Development of a dynamic model for simulation of a thermoelectric self-cooling system for linear direct drives in machine tools
E. Uhlmann, L. Prasol, S.Thom, S. Salein, R. Wiese
System modelling and control concepts of different cooling system structures for machine tools
J. Popken, L. Shabi, J. Weber, J. Weber
The electric drive as a thermo-energetic black box
S. Winkler, R. Werner
Thermal error compensation on linear direct drive based on latent heat storage
I. Voigt, S. Winkler, R. Werner, A. Bucht, W.-G. Drossel
Industrial relevance and causes of thermal issues in machine tools
M. Putz, C. Richter, J. Regel, M. Bräunig
Clustering by optimal subsets to describe environment interdependencies
J. Glänzel, R. Unger, S. Ihlenfeldt
Using meta models for enclosures in machine tools
F. Pavliček, D. P. Pamies, J. Mayr, S. Züst, P. Blaser, P. Hernández-Becerro, K. Wegener
Model order reduction of thermal models of machine tools with varying boundary conditions
P. Hernández-Becerro, J. Mayr, P. Blaser, F. Pavliček, K. Wegener
Effectiveness of modelling the thermal behaviour of the ball screw unit with moving heat sources taken into account
J. Jedrzejewski, Z. Kowal, W. Kwasny, Z. Winiarski
Analyzing and optimizing the fluidic tempering of machine tool frames
A. Hellmich, J. Glänzel, A. Pierer
Thermo-mechanical interactions in hot stamping
L. Penter, N. Pierschel
Experimental analysis of the heat flux into the grinding tool in creep feed grinding with CBN abrasives
C. Wrobel, D. Trauth, P. Mattfeld, F. Klocke
Development of multidimensional characteristic diagrams for the real-time correction of thermally caused TCP-displacements in precise machining
M. Putz, C. Oppermann, M. Bräunig
Measurement of near cutting edge temperatures in the single point diamond turning process
E. Uhlmann, D. Oberschmidt, S. Frenzel, J. Polte
Investigation of heat flows during the milling processes through infrared thermography and inverse modelling
T. Helmig, T. Augspurger, Y. Frekers, B. Döbbeler, F. Klocke, R. Kneer
Thermally induced displacements of machine tool structure, tool and workpiece due to cutting processes
O. Horejš, M. Mareš, J. Hornych
A new calibration approach for a grey-box model for thermal
error compensation of a C-Axis
C. Brecher, R. Spierling, M. Fey
Investigation of passive torque of oil-air lubricated angular contact ball bearing and its modelling
J. Kekula, M. Sulitka, P. Kolář, P. Kohút, J. Shim, C. H. Park, J. Hwang
Cooling strategy for motorized spindle based on energy and power criterion to reduce thermal errors
S. Grama, A. N. Badhe, A. Mathur
Cooling potential of heat pipes and heat exchangers within a machine tool spindleo
B. Denkena, B. Bergman, H. Klemme, D. Dahlmann
Structure model based correction of machine tools
X. Thiem, B. Kauschinger, S. Ihlenfeldt
Optimal temperature probe location for the compensation of transient thermal errors
G. Aguirre, J. Cilla, J. Otaegi, H. Urreta
Adaptive learning control for thermal error compensation on 5-axis machine tools with sudden boundary condition changes
P. Blaser, J. Mayr, F. Pavliček, P. Hernández-Becerro, K. Wegener
Hybrid correction of thermal errors using temperature and deformation sensors
C. Naumann, C. Brecher, C. Baum, F. Tzanetos, S. Ihlenfeldt, M. Putz
Optimal sensor placement based on model order reduction
P. Benner, R. Herzog, N. Lang, I. Riedel, J. Saak
Workpiece temperature measurement and stabilization prior to dimensional measurement
N. S. Mian, S. Fletcher, A. P. Longstaff
Measurement of test pieces for thermal induced displacements on milling machines
H. Höfer, H. Wiemer
Model reduction for thermally induced deformation compensation of metrology frames
J. v. d. Boom
Local heat transfer measurement
A. Kuntze, S. Odenbach, W. Uffrecht
Thermal error compensation of 5-axis machine tools using a staggered modelling approach
J. Mayr, T. Tiberini. P. Blaser, K. Wegener
Design of a Photogrammetric Measurement System for Displacement and Deformation on Machine Tools
M. Riedel, J. Deutsch, J. Müller. S. Ihlenfeldt
Thermography on Machine Tools
M. Riedel, J. Deutsch, J. Müller, S. Ihlenfeldt
Test piece for thermal investigations of 5-axis machine tolls by on-machine measurement
M. Wiesener. P. Blaser, S. Böhl, J. Mayr, K. Wegene
Challenges and Opportunities for Multi-functional Oxide Thin Films for Voltage Tunable Radio Frequency/Microwave Components
There has been significant progress on the fundamental science and technological applications of complex oxides and multiferroics. Among complex oxide thin films, barium strontium titanate (BST) has become the material of choice for room-temperature-based voltage-tunable dielectric thin films, due to its large dielectric tunability and low microwave loss at room temperature. BST thin film varactor technology based reconfigurable radio frequency (RF)/microwave components have been demonstrated with the potential to lower the size, weight, and power needs of a future generation of communication and radar systems. Low-power multiferroic devices have also been recently demonstrated. Strong magneto-electric coupling has also been demonstrated in different multiferroic heterostructures, which show giant voltage control of the ferromagnetic resonance frequency of more than two octaves. This manuscript reviews recent advances in the processing, and application development for the complex oxides and multiferroics, with the focus on voltage tunable RF/microwave components. The over-arching goal of this review is to provide a synopsis of the current state-of the-art of complex oxide and multiferroic thin film materials and devices, identify technical issues and technical challenges that need to be overcome for successful insertion of the technology for both military and commercial applications, and provide mitigation strategies to address these technical challenges
Mission oriented R and D and the advancement of technology: The impact of NASA contributions, volume 2
NASA contributions to the advancement of major developments in twelve selected fields of technology are presented. The twelve fields of technology discussed are: (1) cryogenics, (2) electrochemical energy conversion and storage, (3) high-temperature ceramics, (4) high-temperature metals (5) integrated circuits, (6) internal gas dynamics (7) materials machining and forming, (8) materials joining, (9) microwave systems, (10) nondestructive testing, (11) simulation, and (12) telemetry. These field were selected on the basis of both NASA and nonaerospace interest and activity
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