PERMANENT magnet generators, MAGNETIC alloys, AMORPHOUS alloys, MAGNETIC materials, PERMANENT magnets, AMORPHOUS substances, and MAGNETIC cores
This paper deals with the design, prototyping, and testing of a high-speed permanent magnet generator with a stator magnetic core made of amorphous magnetic material (AMM) for aerospace applications. The target operative speed range is 30 000–60 000 rpm with an output power range between 50 and 300 kW. Two types of winding are examined and compared: tooth-coil and distributed. Special attention is dedicated to the rotor dynamics aspects of the solid disk magnet rotor assembly. The multidisciplinary design process is described. Electromagnetic calculations are provided for different operative conditions where the magnetic field and loss distribution are determined. Based on the design results, a full-size prototype rated at 120 kW and 60 000 rpm rotational speed featuring a stator core made of AMM has been developed and tested. The test results proved the high efficiency achievable with the described technical solutions. It has been proved that the use of AMMs in high-speed electrical machines enables to minimize losses in the stator magnetic core by five to seven times in comparison with traditional materials. [ABSTRACT FROM AUTHOR]
Rasekh, Navid, Dabiri, Soroush, Rasekh, Nima, Mirsalim, Mojtaba, and Bahiraei, Mehdi
Journal of Cleaner Production. Jan2020, Vol. 243, pN.PAG-N.PAG. 1p.
WIRELESS power transmission, ELECTRIC vehicle batteries, FINITE volume method, PLUG-in hybrid electric vehicles, THERMAL analysis, COMPUTATIONAL fluid dynamics, HEAT, and DISC brakes
By employing Wireless Power Transfer (WPT), the complexities of wire utilization are eliminated in charging electric devices, especially Electric Vehicles (EVs) and Plug-in Hybrid Electric Vehicles (PHEVs). WPT can be used in both stationary and dynamic modes to charge battery of EVs and PHEVs. There are few magnetic structures that are used as transmitter and receiver sides of WPT to improve the efficiency. A first of its kind, this paper conducted a temperature analysis for three substantial pads including Double-D Pad (DDP), Double-D Quadrature Pad (DDQP), and Bipolar Pad (BPP). For this, the electromagnetic finite element method and finite volume computational fluid dynamics were employed simultaneously. After the two-way solution of the electromagnetic and thermal energy equations, the temperature distribution in all the components of the primary and secondary pads was obtained in the aligned and misaligned positions. In doing so, the material characteristics were considered as temperature-dependent. Finally, with DDP as a transmitter; and DDP, DDQP, and BPP as receivers, prototyping was conducted to verify the analytical results, and to validate that the procedure employed in this study is capable of being applied to conventional and innovative types of WPT magnetic structures. • Thermal analysis of three substantial pads is conducted for wireless power transfer. • Electromagnetic finite element and finite volume approaches are employed simultaneously. • Temperature distribution in all components of primary and secondary pads is obtained. • Current method can be used for common and novel types of wireless power transfer structures. [ABSTRACT FROM AUTHOR]
DIRECT currents, AREA measurement, REACTION time, ELECTRIC inductance, VOLT-ampere reactive, PULSE width modulation transformers, ELECTRIC inverters, and TESTING laboratories
Failure of the commutation process is a serious malfunction in line-commutated high-voltage direct current (HVdc) converters, which mainly occurs due to inverter ac faults and may lead to outage of the HVdc system. In this paper, an improved strategy is developed that functions based on the SIEMENS HVdc control system under normal conditions and switches to a designed commutation failure inhibition module (CFIM) during an inverter ac fault. From the response speed point of view, since the designed CFIM does not require any proportional-integral controller, the inverter control system has a quick performance in prevention of the commutation failure. This is achieved by direct measurement of the overlap area using the waveforms of the valves anode–cathode and commuting voltages. In addition, from the accuracy aspect, the proposed method has a superior performance in comparison with the existing strategies. It is because of the fact that by direct measurement of the overlap area, variations of both direct current and the commutation inductance are considered, and hence, the unnecessary increase of the inverter reactive power consumption during the fault and the repetitive commutation failures are prevented. The practical performance and feasibility of the proposed strategy is validated through the laboratory testing, using the real-time Opal-RT hardware prototyping platform. The experimental results demonstrate that the proposed strategy can effectively inhibit the commutation failure or repetitive commutation failures under different fault types by considering the lowest possible reactive power consumption. [ABSTRACT FROM AUTHOR]
SOFTWARE-defined networking (Computer network technology), INFORMATION sharing, and MEASUREMENT errors
Software Defined Networking (SDN) is the latest networking paradigm that espouses the separation of the control plane from the data plane for increased flexibility in the routing of flows through the network. Closely associated with SDN is OpenFlow, the most widely used protocol governing the information exchange between the data plane (switching devices) and the control plane (controller). The ease of implementing and testing new schemes in SDN has prompted many researchers to adopt the experimental and prototyping approach to validate their ideas. While the experimentation approach in validation has merits, analytical modelling provides valuable insights by making explicit the dependence of SDN performance on chosen parameters of interest. However, there is no exact queueing analysis of SDN with OpenFlow switches. In this paper, (i) we propose a queueing model of an OpenFlow–based SDN that takes into account classful treatment of packets arriving at a switch and (ii) provide an exact analysis of the proposed queueing model. In tandem, these two aspects have not been accurately modelled (if at all) by the handful of research done in this area. The proposed queueing model is validated by simulation and measurements on a test network and the prediction errors for simulation and measurements are lower than 2% and 10.5% respectively. [ABSTRACT FROM AUTHOR]
Conservation Biology. Dec 2019, Vol. 33 Issue 6, p1448, 3 p.
***** No abstract is available for this article. Article Note: Article impact statement: Web-application development frameworks enable the creation of decision-support tool prototypes for actionable conservation science. CAPTION(S): Table 1. List of web-application development frameworks that might be useful for conservation scientists. Byline: Denis Valle, Kok Ben Toh, Justin Millar
This paper proposes a novel error correction grey prediction model for degradation prediction of renewable energy storages. The proposed approach uses an error correction factor ψ to eliminate the inherent error of the original grey model (GM), and at the same time retain the original simplicity and fast prototyping. In addition, due to the uncertainty and complexity of failure mechanisms, a trigonometric residual modification is considered in order to well-describe the influence of operating conditions or cyclic fluctuation on the renewable energy storages. Two experimental case studies, including lithium-ion battery and fuel cell aging tests, are performed to validate the performance of the proposed method. In particular, the accuracy of the proposed method is investigated for different prediction horizon lengths, in order to further demonstrate its effectiveness and robustness. It is worth mentioning that the proposed method can ensure the accuracy of the remaining useful life estimation in the case of long-term forecasting, and thus, the maintenance management and corrective action of renewable energy storages can be scheduled earlier, leading to more effective cost minimization and risk mitigation. [ABSTRACT FROM AUTHOR]
ARDUINO (Microcontroller), SPECTRAL irradiance, SOLAR spectra, SOLAR cells, PHOTOVOLTAIC cells, LIGHT emitting diodes, and SOLAR thermal energy
Solar simulators are a fundamental instrument to characterize solar cells parameters, as they can reproduce the operating conditions under which the solar cells are going to work. However, these systems are frequently big, heavy, and expensive, and a small solar simulator could be a good contribution to test small prototyping devices manufactured in research labs, especially if it could manage the irradiation at any wavelength interval in a custom way. We have designed, developed, and calibrated a small solar simulator made entirely with LEDs, no optics inside, and electronically controlled through a PC using an Arduino microcontroller. The whole structure is 3-D printed in black PLA plastic. The electrical current through the LEDs, and thus the spectral irradiance of the simulator, is controlled with a very intuitive LabVIEW interface. As our calibration proves, we have built an easily reproducible and low-cost Class AAA solar simulator in a central illumination area of 1 cm2, according to the IEC60904-9 standard. This means that the homogeneity in that area is under a 2% deviation in spatial terms, below 0.5% in temporal terms, and is a factor of a 3% close to the AM1.5G sun reference spectrum. The system can be built and used in any research lab to get quick tests of new small solar cells of any material. [ABSTRACT FROM AUTHOR]
Language Resources and Evaluation. Dec 2019, Vol. 53 Issue 4, p565, 38 p.
Computational linguistics -- Methods, Computational linguistics -- Analysis, Natural language interfaces -- Methods, Natural language interfaces -- Analysis, Language processing -- Methods, and Language processing -- Analysis
This position paper is based on a keynote presentation at the COLING 2016 Workshop on Language Technology for Digital Humanities in Osaka, Japan. It departs from observations about working practices in Humanities disciplines following a hermeneutic tradition of text interpretation versus the method-oriented research strategies in Computational Linguistics (CL). The respective praxeological traditions are quite different. Yet more and more researchers are willing to open up towards truly transdisciplinary collaborations, trying to exploit advanced methods from CL within research that ultimately addresses questions from the traditional Humanities disciplines and the Social Sciences. The article identifies two central workflow-related issues for this type of collaborative project in the Digital Humanities (DH) and Computational Social Science: (1) a scheduling dilemma, which affects the point in the course of the project when specifications of the core analysis task are fixed (as early as possible from the computational perspective, but as late as possible from the Humanities perspective) and (2) the subjectivity problem, which concerns the degree of intersubjective stability of the target categories of analysis. CL methodology demands high inter-annotator agreement and theory-independent categories, while the categories in hermeneutic reasoning are often tied to a particular interpretive approach (viz. a theory of literary interpretation) and may bear a non-trivial relation to a reader's pre-understanding. Building a comprehensive methodological framework that helps overcome these issues requires considerable time and patience. The established computational methodology has to be gradually opened up to more hermeneutically oriented research questions resources and tools for the relevant categories of analysis have to be constructed. This article does not call into question that well-targeted efforts along this path are worthwhile. Yet, it makes the following additional programmatic point regarding directions for future research: It might be fruitful to explore--in parallel--the potential lying in DH-specific variants of the concept of rapid prototyping from Software Engineering. To get an idea of how computational analysis of some aspect of text might contribute to a hermeneutic research question, a prototypical analysis model is constructed, e.g., from related data collections and analysis categories, using transfer techniques. While the initial quality of analysis may be limited, the idea of rapid probing allows scholars to explore how the analysis fits in an actual workflow on the target text data and it can thus provide early feedback for the process of refining the modeling. If the rapid probing method can indeed be incorporated in a hermeneutic framework to the satisfaction of well-disposed Humanities scholars, a swifter exploration of alternative paths of analysis would become possible. This may generate considerable additional momentum for transdisciplinary integration. It is as yet too early to point to truly Humanities-oriented examples of the proposed rapid probing technique. To nevertheless make the programmatic idea more concrete, the article uses two experimental scenarios to argue how rapid probing might help addressing the scheduling dilemma and the subjectivity problem respectively. The first scenario illustrates the transfer of complex analysis pipelines across corpora the second one addresses rapid annotation experiments targeting character mentions in literary text.
Tenders are invited for Large format duel extruder rapid prototyping system. Details are as per rfp. Product Category: Miscellaneous goods EMD Amount (INR): 1,00,000 Tender Type: Open tender Bid Validity(Days): [...]
Technology application, 3D printing -- Technology application, and Fireproofing agents -- Technology application
As intelligent industrial manufacturing gains a stronger foothold in production alongside the more established customization/prototyping arenas, Clariant returns to this years formnext with new solutions to support the growth. A [...]
Contract notice: work for the installation of a laser prototyping machine at insset saint-quentin Main features: market form: ordinary. award of a single market Campus of saint-quentin 48, rue d~ostende [...]
FREIGHT & freightage, TRANSPORTATION, ELECTRIC motor buses, BACKWATER, MOBILITY of law, and METROPOLIS
Neye is co-founder of Berlin Motion Lab, a maker space that provides guided prototyping for mobility-minded startups. Back at the Berlin Motion Lab, specialty delivery bikes are a popular concept. [Extracted from the article]
Bare PCBs are the foundation of any electronic device. With the increasing role of electronics in everyday life, including mobile phones, self-driving and electric cars, home automation and especially IoT, [...]