Search results: Found 25

Listing 1 - 10 of 25 << page
of 3
>>
Sort by
Grundlegende Aspekte des 2K-Metallpulverspritzgießens

Author:
Book Series: Schriftenreihe des Instituts für Angewandte Materialien, Karlsruher Institut für Technologie ISSN: 21929963 ISBN: 9783731502173 Year: Volume: 36 Pages: III, 138 p. DOI: 10.5445/KSP/1000040997 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:58
License:

Loading...
Export citation

Choose an application

Abstract

An important requirement for the combination of two materials in order to get a low stress and low warpage, crack-free composite component is a timely synchronized sintering behavior of both components. The aim of this work was to analyze the effect of the particle size distribution on the sintering behavior and the resulting consequences of the particle size change for the flow properties during injection molding.

Prozessentwicklung eines industrietauglichen Verfahrens zur Fertigung von vereinzelten LIGA-Mikrobauteilen

Author:
Book Series: Schriften des Instituts für Mikrostrukturtechnik am Karlsruher Institut für Technologie / Hrsg.: Institut für Mikrostrukturtechnik ISSN: 18695183 ISBN: 9783731503262 Year: Volume: 30 Pages: VII, 211 p. DOI: 10.5445/KSP/1000045013 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:02
License:

Loading...
Export citation

Choose an application

Abstract

This work deals with the development of an industry suited process aiming on the fabrication (based on the LIGA technique) of near net shape, single microparts. Those microparts should lead to new innovative ideas and thus to successful products on the market.

Entwicklung und Herstellung naturähnlich verzweigter Kühlkörper für LED-Systeme

Author:
Book Series: Spektrum der Lichttechnik / Karlsruher Institut für Technologie (KIT), Lichttechnisches Institut ISSN: 21951152 ISBN: 9783731506355 Year: Volume: 14 Pages: IV, 228 p. DOI: 10.5445/KSP/1000066146 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:59
License:

Loading...
Export citation

Choose an application

Abstract

In terms of general lighting applications, this work deals with the use of natural models for the heat dissipation of LEDs, their implementation into a complete LED system and ultimately its manufacturing. The result is a lighting system that represents a high technical performance in conjunction with a high aesthetic value that can be an example for the development of different LED systems.

Influence of Emitter Surface Roughness and Emission Inhomogeneity on Efficiency and Stability of High Power Fusion Gyrotrons

Author:
Book Series: Karlsruher Forschungsberichte aus dem Institut für Hochleistungsimpuls- und Mikrowellentechnik ISSN: 21922764 ISBN: 9783731505785 Year: Volume: 9 Pages: XV, 197 p. DOI: 10.5445/KSP/1000058566 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:59
License:

Loading...
Export citation

Choose an application

Abstract

The increasing demand for powerful, reliable, and efficient gyrotron oscillators for Electron Cyclotron Resonance Heating (ECRH) in fusion plasma experiments requires a close look at the various factors in gyrotrons that determine gyrotron performance. In this frame, the influence of emitter surface roughness, emission inhomogeneity, and secondary electron generation on gyrotron operation is presented, with focus on Low Frequency Oscillations (LFOs) and Electron Beam Halo (EBH) generation.

Großformatige Abformung mikrostrukturierter Formeinsätze durch Heißprägen

Author:
ISBN: 9783866441859 Year: Pages: VII, 127 p. DOI: 10.5445/KSP/1000007182 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:00
License:

Loading...
Export citation

Choose an application

Abstract

Im Rahmen dieser Arbeit wird das Heißprägeverfahren für große Formate und Strukturen mit hohen Aspektverhältnissen weiter entwickelt.Weiterhin werden Möglichkeiten zur Herstellung großformatiger Formeinsätze und zur Abformung durchgehender

Flüssigprozessierte organische Tandem-Leuchtdioden

Author:
ISBN: 9783731503279 Year: Pages: XII, 205 p. DOI: 10.5445/KSP/1000045067 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:00
License:

Loading...
Export citation

Choose an application

Abstract

In this work, printable organic tandem light emitting diodes for future cost-efficient, long-time stable and white light emitting devices are presented. The key to such multilayer devices is to develop charge carrier injection layers based on metal-oxides like WO3, MoO3, V2O5 and modified ZnO, which can be applied from precursors. Furthermore, these precursor-based approach enables the fabrication of OLED with inverted architecture as well as transparent light emitting diodes.

Discontinuous Fiber Composites

Author:
ISBN: 9783038974918 / 9783038974925 Year: Pages: 210 DOI: 10.3390/books978-3-03897-492-5 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Chemistry (General) --- General and Civil Engineering --- Materials
Added to DOAB on : 2019-01-15 12:25:03
License:

Loading...
Export citation

Choose an application

Abstract

Discontinuous fiber-reinforced polymers have gained importance in the transportation industries due to their outstanding material properties, lower manufacturing costs and superior lightweight characteristics. One of the most attractive attributes of discontinuous fiber reinforced composites is the ease with which they can be manufactured in large numbers, using injection and compression molding processes.Typical processes involving discontinuous fiber reinforced thermoplastic composite materials include injection and compression molding processes as well as extrusion. Furthermore, the automotive and appliance industries also use thermosets reinforced with chopped fibers in the form of sheet molding compound and bulk molding compound, for compression and injection-compression molding processes, respectively.A big disadvantage of discontinuous fiber composites is that the configuration of the reinforcing fibers is significantly changed throughout production process, reflected in the form of fiber attrition, excessive fiber orientation, fiber jamming and fiber matrix separation. This process-induced variation of the microstructural fiber properties within the molded part introduces heterogeneity and anisotropies to the mechanical properties, which can limit the potential of discontinuous fiber reinforced composites for lightweight applications.The main aim of this Special Issue is to collect various investigations focused on the processing of discontinuous fiber reinforced composites and the effect processing has on fiber orientation, fiber length and fiber density distributions throughout the final part. Papers presenting investigations on the effect fiber configurations have on the mechanical properties of the final composite products and materials are welcome in the Special Issue. Researchers who are modeling and simulating processes involving discontinuous fiber composites as well as those performing experimental studies involving these composites are welcomed to submit papers. Authors are encouraged to present new models, constitutive laws and measuring and monitoring techniques to provide a complete framework on these groundbreaking materials and facilitate their use in different engineering applications.

Product/Process Fingerprint in Micro Manufacturing

Author:
ISBN: 9783039210343 / 9783039210350 Year: Pages: 274 DOI: 10.3390/books978-3-03921-035-0 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General)
Added to DOAB on : 2019-06-26 08:44:06
License:

Loading...
Export citation

Choose an application

Abstract

The continuous miniaturization of products and the growing complexity of their embedded multifunctionalities necessitates continuous research and development efforts regarding micro components and related micro manufacturing technologies. Highly miniaturized systems, manufactured using a wide variety of materials, have found application in key technological fields, such as healthcare devices, micro implants, mobility, communications, optics, and micro electromechanical systems. Innovations required for the high-precision manufacturing of micro components can specifically be achieved through optimizations using post-process (i.e., offline) and in-process (i.e., online) metrology of both process input and output parameters, as well as geometrical features of the produced micro parts. However, it is of critical importance to reduce the metrology and optimization efforts, since process and product quality control can represent a significant portion of the total production time in micro manufacturing. To solve this fundamental challenge, research efforts have been undertaken in order to define, investigate, implement, and validate the so-called “product/process manufacturing fingerprint” concept. The “product manufacturing fingerprint” concept refers to those unique dimensional outcomes (e.g., surface topography, form error, critical dimensions, etc.) on the produced component that, if kept under control and within specifications, ensure that the entire micro component complies to its specifications. The “process manufacturing fingerprint” is a specific process parameter or feature to be monitored and controlled, in order to maintain the manufacture of products within the specified tolerances. By integrating both product and process manufacturing fingerprint concepts, the metrology and optimization efforts are highly reduced. Therefore, the quality of the micro products increases, with an obvious improvement in production yield. Accordingly, this Special Issue seeks to showcase research papers, short communications, and review articles that focus on novel methodological developments and applications in micro- and sub-micro-scale manufacturing, process monitoring and control, as well as micro and sub-micro product quality assurance. Focus will be on micro manufacturing process chains and their micro product/process fingerprint, towards full process optimization and zero-defect micro manufacturing.

Keywords

micro-injection moulding --- quality assurance --- process monitoring --- micro metrology --- positioning platform --- Halbach linear motor --- commercial control hardware --- diffractive optics --- gratings --- microfabrication --- computer holography --- manufacturing signature --- process fingerprint --- Fresnel lenses --- injection compression molding --- injection molding --- micro structures replication --- confocal microscopy --- optical quality control --- uncertainty budget --- optimization --- precision injection molding --- quality control --- process monitoring --- product fingerprint --- process fingerprint --- electrical discharge machining --- electrical discharge machining (EDM) --- surface roughness --- surface integrity --- optimization --- desirability function --- satellite drop --- electrohydrodynamic jet printing --- charge relaxation time --- laser ablation --- superhydrophobic surface --- process fingerprint --- product fingerprint --- surface morphology --- artificial compound eye --- multi-spectral imaging --- lithography --- spectral splitting --- plasma-electrolytic polishing --- PeP --- surface modification --- finishing --- electro chemical machining --- ECM --- Electro sinter forging --- resistance sintering --- electrical current --- fingerprints --- electrical discharge machining --- micro drilling --- process monitoring --- quality control --- electrochemical machining (ECM) --- process control --- current monitoring --- current density --- surface roughness --- inline metrology --- haptic actuator --- impact analysis --- high strain rate effect --- damping --- 2-step analysis --- micro-grinding --- bioceramics --- materials characterisation --- dental implant --- microinjection moulding --- process fingerprints --- flow length --- quality assurance --- n/a

Processing-Structure-Properties Relationships in Polymers

Author:
ISBN: 9783039218806 / 9783039218813 Year: Pages: 400 DOI: 10.3390/books978-3-03921-881-3 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-01-07 09:08:26
License:

Loading...
Export citation

Choose an application

Abstract

This collection of research and review papers is aimed at depicting the state of the art on the possible correlations between processing variables, obtained structure and special properties which this structure induces on the plastic part. The extraordinary capacity of plastics to modify their properties according to a particular structure is evidenced for several transformation processes and for many applications. The final common goal is to take profit of this peculiar capacity of plastics by inducing, through a suitable processing, a specific spatial organization.

Keywords

carbon nanotube --- homogeneous dispersion --- ethylene vinyl acetate --- mechanical performance --- electrical conductivity --- microencapsulation --- melamine polyphosphate --- polyurethane --- composite --- flame retardant --- biodegradable nanofibers --- PLGA --- collagen --- epinephrine --- lidocaine --- polyimide film --- linear coefficient of thermal expansion (CTE) --- copper clad laminate --- structure and properties --- polymorphism --- isotactic polypropylene --- deformation --- phase transitions --- uniaxial compression --- uniaxial tensile deformation --- temperature --- in situ X-ray --- cavitation --- indentation --- Harmonix AFM --- polymer morphology --- mechanical properties --- ultra-high molecular weight polyethylene (UHMWPE) --- microcellular injection molding --- supercritical fluid --- supercritical N2 --- supercritical CO2 --- tissue engineering and regenerative medicine --- bioresorbable polymers --- 3D printing/additive manufacturing --- fused filament fabrication/fused deposition modelling --- degradation --- physicochemical characterization --- polycaprolactone --- layered double hydroxides --- ionic liquids --- PLA --- reactive blending --- biobased films --- graphene --- nanoreinforcement --- curing rate --- epoxy microstructure --- fatigue --- composites --- critical gel --- poly(lactic acid) --- carbon black --- graphite --- polymer blend --- poly(ethylene terephthalate) --- intrinsic viscosity --- polyolefin --- compatibilizer --- isotactic polypropylene --- stress-induced phase transitions --- structural analysis --- X-ray diffraction --- polyoxymethylene (POM) --- octakis[(3-glycidoxypropyl)dimethylsiloxy]octasilsesquioxane (GPOSS) --- composites --- morphology --- mechanical properties --- conductive filler --- orientation --- conductive polymer composites --- foam --- model --- PLLA --- bioresorbable vascular scaffolds --- stretch blow molding --- biaxial elongation --- SAXS --- WAXS --- microfibrillar composites --- crystalline morphology --- crystallinity --- mechanical properties --- crystallisation --- morphology --- nanoparticles --- shear --- flow --- orientation --- poly(?-caprolactone) --- polyvinyl butyral --- hydrophobicity --- contact angle --- polypropylene --- atomic force microscopy --- injection molding --- mold temperature evolution --- polycaprolactone --- ultra-high molecular weight polyethylene --- incremental forming --- SPIF --- XRD --- chain orientation --- temperature sensitive --- gel --- controllable gas permeability --- breathable film --- polymer composite --- processing --- polyamide 6 --- compression molding --- polymorphism --- polyamide 6 --- injection molding --- polymorphism --- humidity --- mechanical properties

Thin Film Transistor

Author:
ISBN: 9783039215263 / 9783039215270 Year: Pages: 108 DOI: 10.3390/books978-3-03921-527-0 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering --- Electrical and Nuclear Engineering
Added to DOAB on : 2019-12-09 16:10:12
License:

Loading...
Export citation

Choose an application

Abstract

Recently, new wide-band energy gap semiconductors can be grown by ALD, PLD, sputtering, or MOCVD. They have great potential for the fabrication and application to TFTs. Inorganic semiconductors have good stability against environmental degradation over their organic counterparts, whereas organic materials are usually flexible, transparent, and when solution-processed at low temperatures, are prone to degradation when exposed to heat, moisture, and oxygen. For this Special Issue, we invited researchers to submit papers discussing the development of new functional and smart materials, and inorganic as well as organic semiconductor materials, such as ZnO, InZnO, GaO, AlGaO, AnGaO, AlN/GaN, conducting polymers, molecular semiconductors, perovskite-based materials, carbon nanotubes, carbon nanotubes/polymer composites, and 2D materials (e.g., graphene, MoS2) and their potential applications in display drivers, radio frequency identification tags, e-paper, gas, chemical and biosensors, to name but a few.

Listing 1 - 10 of 25 << page
of 3
>>
Sort by
Narrow your search
-->