Detailed knowledge of electricity demand is essential for power system planning and operation. EUs 20-20-20 targets will increase the development of more energy efficient buildings as all new buildings shall be "...
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Detailed knowledge of electricity demand is essential for power system planning and operation. EUs 20-20-20 targets will increase the development of more energy efficient buildings as all new buildings shall be "nearly zero energy buildings" by 2020. The result from this ambition is that so-called passive buildings and nearly-net-zero-energy-buildings (nZEB), with lower energy demand, or even onsite power generation, will significantly change the way buildings are integrated in the power system. System operators must consequently prepare for changes in load profiles. However, the knowledge on the aggregated impact of nZEBs is so far limited because the actual number of such buildings is still very small. This paper contributes to this knowledge gap by estimating the aggregated effect on electricity demand profiles. The load modelling is based on a statistical approach deriving hourly electricity load profiles of non-residential buildings based on measurements of 100 buildings. The profiles will be used as basis in further work to study the impact of a large rollout of ZEBs on the power system.
The construction of an inductive charging infrastructure for shared use of electric vehicles in an urban area means different challenges. On the one hand, the electrical components must be selected, installed and conn...
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The construction of an inductive charging infrastructure for shared use of electric vehicles in an urban area means different challenges. On the one hand, the electrical components must be selected, installed and connected in accordance with certain preconditions in order to work. On the other hand, the boundary conditions of the charging system integrated into the street have to be taken into account. This means a totally new starting situation for the operation of the technology, in particular in the use of an underground distribution system for the installation of the components.
If a photovoltaic (PV) technology is assessed today in a technical framework, then efficiency is the most commonly addressed parameter, followed by service lifetime. Cost, as the third parameter of the "magic tri...
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The Web systems domain has faced an increasing number of devices, browsers, and platforms to cope with, driving software systems to be more flexible to accomodate them. Software product line (SPL) engineering can be u...
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To further the development of polymer electrolyte membrane (PEM) fuel cells control strategies must be developed and optimized. In this study, an analysis process to derive a control strategy based on impedance data i...
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Context. Distributed software development is currently a modern practice in software industry. This is especially true in Open Source Software (OSS) development community. Understanding how developers' practices a...
In this paper a novel design of an actively powered arm orthotics is discussed. A light and effective electromechanical motor gear combination is designed which produces torque directly at the elbow. The modular desig...
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In this paper a novel design of an actively powered arm orthotics is discussed. A light and effective electromechanical motor gear combination is designed which produces torque directly at the elbow. The modular design of the drive system makes it possible to use it in different applications in the field of orthotics, prosthetics and exoskeletons. The EMG sensors are used to measure the nerve impulses. These impulses are then analyzed to generate the reference torque and position values and send it to the motion control unit. This type of actively powered orthotics is developed as a part of an European research project for patients with apoplectic stroke. However, the same principle can also be used in exoskeleton robots.
This study investigated and compared the mechanical properties of boron suboxide (B6O) with and without chromium bromide (CrB2) additive, hot pressed at 1900°C and 1850°C and for 20 minutes, with applied pre...
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ISBN:
(纸本)9789881925350
This study investigated and compared the mechanical properties of boron suboxide (B6O) with and without chromium bromide (CrB2) additive, hot pressed at 1900°C and 1850°C and for 20 minutes, with applied pressures of 50 and 80 MPa respectively. The theoretical density attained for these materials was More than 96%. The phase relationship, microstructures and mechanical properties of these materials were examined and good combination of mechanical properties was obtained with the B6O-CrB2 material (HV 32.1 GPa, K1C 4.5 MPa.m0.5) compared to pure B6O material. Mixing with a small amount (1.7 wt.%, equivalent of 0.4 vol.%) of CrB2 additive resulted in a pronounced improvement in both the hardness and fracture toughness values. The improvement in the fracture toughness was attributed to the introduction of the second phase and the toughening mechanism is presumed to be by crack bridging and deflection due to bimetallic stress.
Pressure retarded osmosis (PRO) uses the free energy of mixing when fresh river water flow into the sea to generate renewable energy. Many operating parameters affect the proper functioning of a PRO unit. Our analysis...
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Pressure retarded osmosis (PRO) uses the free energy of mixing when fresh river water flow into the sea to generate renewable energy. Many operating parameters affect the proper functioning of a PRO unit. Our analysis reveals the influence that the temperature has on power density and demonstrates that membrane performance is improved if the temperature is taken into account. In particular, the influence of the difference of temperatures between both sides of the membrane is investigated. This study demonstrates that structural parameters and physicochemical parameters are significantly affected by the temperature. Using streams with higher temperatures and reducing the temperature difference between the two streams, the process can achieve higher performance.
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