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Additive manufacturing (AM) allows designers to build 3D parts of almost any geometry and streamline the process of moving from initial design to prototype in a shortened timeframe. However the existing technologies are limited to small size parts due only to high resolution of the generally produced designs. If a very large part with typical layer resolutions of 0.2mm is produced, the time required...
This project has designed a material treatment process to extend the lifespan of extrusion augers used by the social enterprise Appropriate Energy Saving Technologies (AEST) in Uganda. AEST uses an extruder machine to recycle agricultural waste into charcoal briquettes that they sell to low-income families. The auger components wore down quickly and needed a hardening process to remain useful for...
Interruption property of vacuum interrupter with four different contact materials were researched by experimental method. The diameter of Wan-type contact and Spiral-type CuCr25 contact was 55mm. The diameter of Spiral-type CuCr35 and CuCr30 was 58mm. The contact thickness was 10mm before breaking test and the contact thickness was about 9mm after breaking test. The breaking current was 31.5kA and...
This paper studies the energy characteristics with respect to process parameters from a systematic point of view, in terms of electricity and materials. A detail analysis of energy characteristics of a CNC machining system is firstly presented, based on which the calculation models of energy efficiency are formulated. Then the effects of process parameters on energy and processing time are investigated...
There has been a revived and growing role for electrical machines and drives across a wide range of applications. Such applications include, hybrid/electrical traction applications, aerospace applications, and renewable energy. All these applications present different set of requirements and challenges. The common trend is that there is a need for higher-performance electrical machines in terms of...
On this paper, a study of state-of-art technologies and techniques for energy harvesting from piezoelectric materials with a focus in bulk power harvesting and production is performed. This study includes improvements in mechanical and electrical configurations to be considered in order to design and implement high-performance energy harvesting systems as well as primary performance and costs estimations...
Biofouling represents a real technical challenge in the marine environment. Current antifouling strategies offer insufficient protection from biofouling for many applications, e.g. water sensing technologies, and effective novel methods of antifouling are required to support technology developments in the marine. Non-toxic approaches to antifouling are desirable; however, further development of effective...
Optical components such as mirrors, filters and windows need to be tested and qualified to verify their resistance in space environments. Future space missions, such as ESA JUICE and SOLO, will operate in harsh environments, rich of ions and electrons. Experiments and development of appropriate protocols are needed to develop proper radiation-hard components and to qualify them.
This paper deals with the idea of developing new philosophies for the reliability assessment of additive layer manufacturing (ALM) parts. ALM is a disruptive new manufacturing method by which components are created adding material layer after layer, allowing for the design and production of complex geometries, unthinkable with the use of traditional subtractive machining methods. Thinking ALM means...
Triboelectric effect works on the principle of triboelectrification and electrostatic induction. This principle is used to generate voltage by converting mechanical energy into electrical energy. This paper presents the charging behavior of different capacitors by rubbing of two different materials using mechanical motion. The numerical and simulation modeling, describes the charging performance of...
CVD and more recently ALD have become methods of choice for the deposition of new materials, to deal with the 3D nature of new devices, and to meet the requirement for atomic level thickness control. Several examples illustrate how precursor design can contribute to keeping the cost of new materials deposition in control, whether through easier facilitization thanks to better physical properties,...
Additive Manufacturing, or 3D printing, is moving from the research labs and into both consumer and commercial manufacturing markets. As the systems, processes and materials available are becoming more mature we are seeing them being tested for new application areas such as electronics. In this paper we review how fused deposition modelling (FDM) is being explored for creating microwave circuits and...
The need to maintain instantaneous equilibrium between supply and demand is a major constraint in the electric power system operations. Energy storage has the ability to solve this issue by allowing energy to be stored and released upon demand. Pumped hydro storage is portrayed as a viable resource that is being mostly used for storing energy. It is also considered one of best storage option that...
Lightning is one of the most unpredictable and destructive forces in nature, and ensuring the protection and safety of aircraft in flight, as well as other modes of airborne transport, when struck by lightning presents a unique set of engineering challenges. In order to progress into a new generation of conductive carbon composites and/or embedded light-weight lightning protection systems, further...
The losses present in electrical machines are of major concern in modern industrial applications, very high speed drives, aerospace applications and the automotive industry. This paper presents the magnetic characterization of non-oriented steel sheets used for manufacturing permanent magnet synchronous machines and synchronous reluctance machines when these steel sheets are used at higher frequencies...
This article proposes a methodology for an adequate design of a 3-levels flux barriers rotor of a synchronous reluctance machine (SR), in order to obtain the highest performances. For that, this study seeks to determine the optimal shape of the flux barriers and at the same time the best current supply of the stator windings. The methodology applied consists in a double optimization: the search for...
This work objectively proposes and describes the development project of a Charpy Pendulum Testing Machine, which is a low-cost tool designed for the academic environment. The tool has been developed to be used in laboratories that perform mechanical tests of impact and also as a result of an important partnership between students and researchers from UMC and EPUSP.
This article combining Internet development under innovation 2.0 with the new form of material management, take West Inner Mongolia Central Railway Corporation for example. Through discussion, it propose a new mode of railway materials management and solve the problem which are widespread of the current construction enterprise material management. It will solve deep-seated problems existing in the...
This work deals with the modeling and optimization of the CuInGaSe/CdS based structure, for photovoltaics. In this study we took into consideration the effect of the concentration of the alloy and the temperature on the strain bandgap, the absorption and efficiency of the structure. It has been shown that the gallium concentration x varies the strain bandgap energy, these two parameters significantly...
In this work, we were interested about the study of modeling and simulation of a structure based on In1−xGaxN/GaN for photovoltaic applications. This ternary alloy who is an III-V semiconductor presents important characteristics especially its bandgap energy, thus the enhancement of the absorption of photons with wavelengths near to red. We had also studied a different parameters characterized the...
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