3,814 results for your search
See details
6.5 kV n-Channel 4H-SiC IGBT with Low Switching Loss Achieved by Extremely Thin Drift Layer
(Switzerland: Trans Tech Publications, 2016), 9 page(s)
Thin drift layers were used to realize n-channel 4H-SiC IGBTs with an extremely low switching loss. The thickness of a drift layer was 60 µm, which was designed for a blocking voltage of 6.5 kV. An on-voltage of 5.4 V was obtained at a collector current of 100 A/cm2 and the specific differential on-resistance at...
Sample
(Switzerland: Trans Tech Publications, 2016), 9 page(s)
Description
Thin drift layers were used to realize n-channel 4H-SiC IGBTs with an extremely low switching loss. The thickness of a drift layer was 60 µm, which was designed for a blocking voltage of 6.5 kV. An on-voltage of 5.4 V was obtained at a collector current of 100 A/cm2 and the specific differential on-resistance at 100 A/cm2 was 20 mOcm2 at room temperature, indicating proper bipolar operation. A switching evaluation of the SiC IGBTs was performed...
Thin drift layers were used to realize n-channel 4H-SiC IGBTs with an extremely low switching loss. The thickness of a drift layer was 60 µm, which was designed for a blocking voltage of 6.5 kV. An on-voltage of 5.4 V was obtained at a collector current of 100 A/cm2 and the specific differential on-resistance at 100 A/cm2 was 20 mOcm2 at room temperature, indicating proper bipolar operation. A switching evaluation of the SiC IGBTs was performed with a bus voltage of 3.6 kV and a load current of 10 A, and a turn-off loss of 1.2 mJ was obtained. This turn-off loss is very small compared to the values in the current literatures, and was estimated to be an over 80% reduction. The series operation of thin-drift-layer 6.5 kV SiC IGBTs can ensure a lower switching loss than the single operation of higher blocking voltage devices in power conversion systems.
Show more
Show less
Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2016-05, 2016
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2016 Trans Tech Publications Ltd.
Discipline Perspective
Engineering
×
See details
2D Barcode Identification Technology Application in Tool Management System for Workshop
(Switzerland: Trans Tech Publications, 2016), 9 page(s)
With the development of advanced automation degree industries, the requirements of network management for workshop tool become more and more urgent. A very important part in network management system is identification technology of the tool. In this paper, 2D (two-dimensional) barcode identification technology is...
Sample
(Switzerland: Trans Tech Publications, 2016), 9 page(s)
Description
With the development of advanced automation degree industries, the requirements of network management for workshop tool become more and more urgent. A very important part in network management system is identification technology of the tool. In this paper, 2D (two-dimensional) barcode identification technology is applied in the tool information in real-time query to realize network management. The 2D barcode reading device, which is combined with...
With the development of advanced automation degree industries, the requirements of network management for workshop tool become more and more urgent. A very important part in network management system is identification technology of the tool. In this paper, 2D (two-dimensional) barcode identification technology is applied in the tool information in real-time query to realize network management. The 2D barcode reading device, which is combined with the local computer decoding software, could achieve communication between production line and the server. By using 2D barcode identification technology, it could achieve network management for workshop tool, improve production efficiency and reduce the artificial error.
Show more
Show less
Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2016-01, 2016
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2016 Trans Tech Publications Ltd.
Discipline Perspective
Engineering
×
See details
3D Numerical Model of the Subsoil-Structure Interaction and Comparison of the Results with Experimentally Measured Values
(Switzerland: Trans Tech Publications, 2017), 13 page(s)
The influence of the physically-nonlinear behaviour of the structure and interaction between the upper structure and foundation are the aspects which influence the results of the subsoil-structure interaction analysis. The experimental measurement of stress and strain and monitoring of stress-strain relations by i...
Sample
(Switzerland: Trans Tech Publications, 2017), 13 page(s)
Description
The influence of the physically-nonlinear behaviour of the structure and interaction between the upper structure and foundation are the aspects which influence the results of the subsoil-structure interaction analysis. The experimental measurement of stress and strain and monitoring of stress-strain relations by interaction of foundation structures with subsoil are also performed at the Faculty of Civil Engineering, VS?B-TU Ostrava. Numerical a...
The influence of the physically-nonlinear behaviour of the structure and interaction between the upper structure and foundation are the aspects which influence the results of the subsoil-structure interaction analysis. The experimental measurement of stress and strain and monitoring of stress-strain relations by interaction of foundation structures with subsoil are also performed at the Faculty of Civil Engineering, VS?B-TU Ostrava. Numerical analyses of contact task was made with FEM. The test sample for the task was a steel-fibre reinforced concrete foundation slab model loaded during experimental loading test. The calculated values of the subsidence do not correspond to the measured values of foundation subsidence of existing buildings, or values measured during the experiments. Results of the solutions are also different and depend on the choice of the model of the subsoil. Using several FEM software tools were made numerical analyses. Results of FEM analyses were also confronted with the values measured during the experiment.
Show more
Show less
Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2017-06, 2017
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2017 Trans Tech Publications Ltd.
Discipline Perspective
Engineering
×
See details
3D Topography Analysis of Ball-End Milled H-13 Die Steel Surfaces Using Wavelet Decomposition Method
(Switzerland: Trans Tech Publications, 2016), 10 page(s)
Optical profiler is employed to measure the surface topography of H-13 die steel machined by ball end cutter. By using 2D discret wavelet decomposition, the topographies of different frequency bands are obtained and the influence of cutter posture on varying frequncy bands topography is studied. The results show t...
Sample
3D Topography Analysis of Ball-End Milled H-13 Die Steel Surfaces Using Wavelet Decomposition Method
(Switzerland: Trans Tech Publications, 2016), 10 page(s)
Description
Optical profiler is employed to measure the surface topography of H-13 die steel machined by ball end cutter. By using 2D discret wavelet decomposition, the topographies of different frequency bands are obtained and the influence of cutter posture on varying frequncy bands topography is studied. The results show that cutter posture has a great influence on the whole frequency band roughness. The changing trend of roughness is roughly the same und...
Optical profiler is employed to measure the surface topography of H-13 die steel machined by ball end cutter. By using 2D discret wavelet decomposition, the topographies of different frequency bands are obtained and the influence of cutter posture on varying frequncy bands topography is studied. The results show that cutter posture has a great influence on the whole frequency band roughness. The changing trend of roughness is roughly the same under different cutter postures which increase firstly then decrease with the decrease in frequency. A surface with a small high frequency roughness may have a large median frequency roughness.
Show more
Show less
Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2016-05, 2016
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2016 Trans Tech Publications Ltd.
Discipline Perspective
Engineering
×
See details
Abegweit
directed by Serge Morin; produced by Pierre Bernier and Diane Poitras, National Film Board of Canada (National Film Board of Canada, 1998), 1 hour 12 mins
This documentary provides an in-depth look into the design and construction of the Confederation Bridge, an important link between Prince Edward Island and New Brunswick. Though the bridge was originally opposed by environmentalists and fishermen, the structure has increased access to Prince Edward Island as a to...
Sample
directed by Serge Morin; produced by Pierre Bernier and Diane Poitras, National Film Board of Canada (National Film Board of Canada, 1998), 1 hour 12 mins
Description
This documentary provides an in-depth look into the design and construction of the Confederation Bridge, an important link between Prince Edward Island and New Brunswick. Though the bridge was originally opposed by environmentalists and fishermen, the structure has increased access to Prince Edward Island as a tourist destination.
Field of Study
Art & Architecture
Content Type
Documentary
Contributor
Pierre Bernier, Diane Poitras, National Film Board of Canada
Author / Creator
Serge Morin
Date Published / Released
1998
Publisher
National Film Board of Canada
Topic / Theme
Island life, Islands, Bridges, Architecture, Engineering, Art & Architecture
Copyright Message
Copyright © 1998 by the National Film Board of Canada
Discipline Perspective
Engineering
×
See details
Accident Description
An accident report published from the Aviation Safety Network database in 2006.
Sample
Description
An accident report published from the Aviation Safety Network database in 2006.
Field of Study
Global Issues
Content Type
Accident report
Date Published / Released
2006
Topic / Theme
BOAC Flight 781, Mechanical engineering, Engineering
Discipline Perspective
Engineering
×
See details
Accident on 25 July 2000 at La Patte d'Oie in Gonesse (95) to the Concorde Registered F-BTSC Operated By Air France: Preliminary Report
written by Bureau d'Enquêtes et d'Analyses pour la Sécurité de l'Aviation Civile (Paris, Ile-de-France: Bureau d'Enquêtes et d'Analyses pour la Sécurité de l'Aviation Civile, 2000, originally published 2000), 64 page(s)
This is the preliminary report released by the BEA (the French aviation authority) following the crash of Air France Flight 4590.
Sample
written by Bureau d'Enquêtes et d'Analyses pour la Sécurité de l'Aviation Civile (Paris, Ile-de-France: Bureau d'Enquêtes et d'Analyses pour la Sécurité de l'Aviation Civile, 2000, originally published 2000), 64 page(s)
Description
This is the preliminary report released by the BEA (the French aviation authority) following the crash of Air France Flight 4590.
Field of Study
Global Issues
Content Type
Accident report
Author / Creator
Bureau d'Enquêtes et d'Analyses pour la Sécurité de l'Aviation Civile
Date Published / Released
2000-09-15, 2000
Publisher
Bureau d'Enquêtes et d'Analyses pour la Sécurité de l'Aviation Civile
Topic / Theme
Air France Flight 4590, Airplanes, Aerospace engineering, Aircraft accidents, Engineering
Copyright Message
Copyright © 2000 by Bureau d'Enquêtes et d'Analyses pour la Sécurité de l'Aviation Civile
Discipline Perspective
Engineering
Sections
×
See details
Accident Report, Comet 1A aircraft CF-CUN at Karachi Civil Airport, Pakistan, March 3, 1953
written by United Kingdom. Air Registration Board, in Air Registration Board, and Civil Aviation Authority, Safety Data and Analysis Unit: Accident Files (London, England: United Kingdom. National Archives at Kew, 1953, originally published 1953), 117 page(s)
This accident report summarizes the investigative findings of the Canadian Pacific Air Lines aircraft that crashed during takeoff on March 3, 1953, in Karachi, Pakistan
Sample
written by United Kingdom. Air Registration Board, in Air Registration Board, and Civil Aviation Authority, Safety Data and Analysis Unit: Accident Files (London, England: United Kingdom. National Archives at Kew, 1953, originally published 1953), 117 page(s)
Description
This accident report summarizes the investigative findings of the Canadian Pacific Air Lines aircraft that crashed during takeoff on March 3, 1953, in Karachi, Pakistan
Field of Study
Global Issues
Content Type
Accident report
Author / Creator
United Kingdom. Air Registration Board
Date Published / Released
1953
Publisher
United Kingdom. National Archives at Kew
Topic / Theme
Canadian Pacific Air Lines Comet 1A Crash, Transportation accidents, Aerospace engineering, Aircraft accidents, Aircraft, Engineering
Copyright Message
Images reproduced by courtesy of The National Archives, London, England. www.nationalarchives.gov.uk. The National Archives give no warranty as to the accuracy, completeness or fitness for the purpose of the information provided. Images may be used only for purposes of research, private study or education. Applications for any other use should be made to The National Archives Image Library, Kew, R...
Images reproduced by courtesy of The National Archives, London, England. www.nationalarchives.gov.uk. The National Archives give no warranty as to the accuracy, completeness or fitness for the purpose of the information provided. Images may be used only for purposes of research, private study or education. Applications for any other use should be made to The National Archives Image Library, Kew, Richmond, Surrey TW9 4DU.
Show more
Show less
Discipline Perspective
Engineering
×
See details
Accuracy and Material Properties in Incremental Forming for a Multi-Step Expanding Approach
(Switzerland: Trans Tech Publications, 2015), 10 page(s)
In incremental sheet forming the material properties change dependent on the wall angle. In addition to sheet thinning, material hardening can be observed and for stainless steel the formation of strain induced martensite has been reported. These process characteristics have been extensively examined for the formi...
Sample
(Switzerland: Trans Tech Publications, 2015), 10 page(s)
Description
In incremental sheet forming the material properties change dependent on the wall angle. In addition to sheet thinning, material hardening can be observed and for stainless steel the formation of strain induced martensite has been reported. These process characteristics have been extensively examined for the forming of parts in one step. In this study, a first investigation is made to control the material properties independent on the wall angle...
In incremental sheet forming the material properties change dependent on the wall angle. In addition to sheet thinning, material hardening can be observed and for stainless steel the formation of strain induced martensite has been reported. These process characteristics have been extensively examined for the forming of parts in one step. In this study, a first investigation is made to control the material properties independent on the wall angle by a multi-step expanding approach. For this, in the first step a steep wall angle is formed and in the following steps this region is transformed to a shallow wall angle, keeping the material properties. To demonstrate and verify this new approach a small cone frustum with a wall angle of 60° was formed as a preform. This cone frustum was repeatedly expanded in steps of 2° to get finally a cone frustum with 30° wall angle. The stepwise expanding causes a considerably growing of the shape in depth direction, especially at the preformed area. By a heuristic approach the geometric accuracy of the final cone was optimized. The microhardness measurement of the formed cones shows that the final cone frustum has a region, where the material properties are similar to the first formed 60° wall angle. By this new approach the possibility to influence the material properties of the final part purely by tool path is demonstrated. In particular it is possible to form regions with shallow wall angles that have the material properties of regions with steep wall angles.
Show more
Show less
Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2015-03, 2015
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2015 Trans Tech Publications Ltd.
Discipline Perspective
Engineering
×
See details
Accurate and Traceable Calibration of the Stiffness of Various AFM Cantilevers
(Switzerland: Trans Tech Publications, 2015), 10 page(s)
Atomic force microscope (AFM) is widely used to measure nanoforce in the analysis of nanomechanical and biomechanical properties. As the critical factor in the nanoforce measurement, the stiffness of the AFM cantilever must be determined properly. In this paper, an accurate and SI-traceable calibration method is p...
Sample
(Switzerland: Trans Tech Publications, 2015), 10 page(s)
Description
Atomic force microscope (AFM) is widely used to measure nanoforce in the analysis of nanomechanical and biomechanical properties. As the critical factor in the nanoforce measurement, the stiffness of the AFM cantilever must be determined properly. In this paper, an accurate and SI-traceable calibration method is presented to obtain the stiffness of the AFM cantilever in the normal direction. The calibration system consists of a homemade AFM head...
Atomic force microscope (AFM) is widely used to measure nanoforce in the analysis of nanomechanical and biomechanical properties. As the critical factor in the nanoforce measurement, the stiffness of the AFM cantilever must be determined properly. In this paper, an accurate and SI-traceable calibration method is presented to obtain the stiffness of the AFM cantilever in the normal direction. The calibration system consists of a homemade AFM head and an ultra-precision electromagnetic balance. The calibration is based on the Hooke's law i.e. the stiffness is equal to the force divided by the deflection of the cantilever. With this system, three kinds of cantilevers were calibrated. The relative standard deviation is better than 1%. The results of these experiments showed good accuracy and repeatability.
Show more
Show less
Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2015-05, 2015
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2015 Trans Tech Publications Ltd.
Discipline Perspective
Engineering
×
