Samples from commercially pure aluminium were subjected to various number of passes Incremental Equal Channel Angular Pressing (I-ECAP) and subsequently welded using Friction Stir Welding (FSW). Similar dissimilar welds obtained investigated in terms their microstructure mechanical properties. In the case similar weld coarse grained stir zone a decreased average grain size was obtained, which resulted enhanced microhardness. samples after I-ECAP, ultrafine regime has not been preserved,...

Abstract This study deals with the numerical modelling of residual stresses and distortions occurring during wire arc additive manufacturing ER 5183 parts weaving deposition. It is shown that mesh size, as well accurate implementation heat source pattern has a significant impact on results. The mechanical material properties for simulation are evaluated utilizing in-house standardized test equipment. Validation thermo-mechanical done by monitoring temperatures process. Additionally, 3D scans...

In this paper we investigate pilot-based channel estimation schemes for mobile OFDM systems. Time variance of the leads to a loss subcarrier orthogonality, resulting in intercarrier interference (ICI). Channel based on pilot tones, which are also subject ICI, will therefore suffer performance degradation. article analyse linear minimum mean squared error (LMMSE) estimators reduce noise due ICI and propose two perform interpolation noise-reduced tones time-direction prior frequency...

We analyse typical indoor propagation scenarios with respect to the capacity gain made available through use of multiple transmit and receive antennas. In particular, we investigate channels a strong line sight component, as evident when array is in same room array. It found that for pure LOS component depends highly on geometry receiver location, such vanishes rapidly distance. show existence stochastic scattering components beneficial obtain maximum gain, thus reducing dependence location....

Photovoltaic installations are becoming increasingly popular, roof-top have never been as affordable and PV parks also blooming. Unfortunately, with all systems, problems can occur. These range from faulty cabling to theft, but more subtle issues such breakdown of a single cell ageing the installation. The objective this paper is present simple method that be used detect issues. proposed only requires two electric power sensors added an existing algorithm relies on self-adaptive model does...

We investigate receive diversity for OFDM-based broadband communication systems. consider the use of multiple antennas to combat time-selective fading and OFDM transmission in combination with an appropriate guard interval suppress intersymbol interference. The scheme is located frequency-domain we derive different linear estimators, hereafter referred as equalizers. show that carrier-based solution optimum MMSE estimator-which least complex maximizes overall SNR well known maximum ratio...

We investigate the impact of channel estimation on multiple antenna diversity reception for broadband mobile OFDM-based communication systems. consider receive antennas to combat effects time-variant fading process and appropriate receiver structures. Given perfect knowledge, techniques OFDM provide both a considerable reduction error floor-which is due variations during one symbol-and performance gain in terms required SNR (due gain). However, actual implementations will rely noisy...

We present a three-step method to perform system identification and optimal control of non-linear systems. Our approach is mainly data driven does not require active excitation the identification. In particular, it designed for systems which only historical under closed-loop are available where commands exhibit low variability. first step, simple simulation models built run various conditions. second neural network architecture extensively trained on outputs learn physics, retrained with...

With the rising popularity of photovoltaic (PV) power, utility companies are experiencing a growing number interconnection requests on their networks. Combined with power quality issues, distribution system operator (DSO) must go through strenuous impact studies before proceeding to installation PV systems. To address this issue, work proposes tool rapidly and accurately compute total hosting capacity (PVHC) network. Moreover, proposed allows implementation user-defined control strategies in...

Renewable energy sources (RES) are changing the operating conditions of power systems. In this context, battery storage systems (BESSs) could be a viable technical solution to maximize local consumption RES generation or provide ancillary services grid. However, lack information about real field performance is affecting diffusion BESS on market. Here we present technological comparison between different lithium-based technologies in terms density, density and efficiency based IEC 62660-1...

We present a non-intrusive load monitoring (NILM) method based on sparse decomposition techniques in order to extract the individual appliance signals from aggregated curve of an household. The proposed is generic and does not need be adapted for each home. It translation-invariant boxcar dictionary atoms, them modeling complete on-off activity event. evaluated our algorithm synthetic real dataset. Experiments showed that we can with more than 20 dB signal-to-distortion ratio (SDR), estimate...

In recent years an interest in magnesium and alloys not only for the automotive industry but also medical applications was increasing due to low density good specific strength. Magnesium show castability lower ductility strength than wrought materials. For this reason, refinement of grains homogenous distribution intermetallic phases are needed improve formability mechanical properties. On other hand, degradation material by corrosion is influenced grain size phase distribution. This work...

We consider a wireless system with multiple antennas at both the transmitter and receiver operating in Rician propagation environment. For fixed bandwidth total transmitted power, channel matrix can be seen as sum of two contributions. The first contribution is related to deterministic component channel, which given by line-of-sight (LOS) path only. second denotes stochastic Rayleigh fading paths, case corresponding elements are modeled random variables. focus on averaged capacity expression...

The present study shows results of friction stir welded (FSW) samples after different plastic deformation routes. welds were made coarse-grained and ultrafine-grained commercially pure aluminium. As a method new hybrid process has been chosen, which resulted in obtaining with characteristics microstructure, also differed dependance the examined plane. Microstructure observations showed that, regardless base material, due to continuous dynamic recrystallization zone was characterized by...

Abstract The main objective of the work described in this paper was development passive and active protective clothing for protection human skin against accidental laser irradiation curtains. Here, systems consist functional multi-layer textiles, providing a high level resistance. In addition, textiles incorporate sensors that detect exposure are, by means safety control, able to deactivate beam automatically.Due lack regulations testing qualifying be used as PPE, test methods were defined...

We treat spatio-temporal channel models for the mobile station in cellular communication systems. The well-known model of wide-sense stationary uncorrelated scattering is extended perspective a vehicular antenna array. define delay-pattern-time-space-correlation function and find closed-form it any given wave incidence profile, array geometry, gain patterns, movement. Various space-time system functions are defined illustrated by means bad urban scenario. Finally, simulation purposes which...

The objective of this work is load shifting domestic appliances for tertiary reserve provision. Aggregate curve simulators are built by modelling stochastic consumer behaviour. Analysis then performed on the number loads that required to aggregate in order provide 5MW control power participate Swiss ancillary service market. It assumed participants allow aggregator delay their certain amount time, where provides flexibility. This focuses usage white goods as represented dishwashers and...

Distributed renewable energy sources (RES), such as photovoltaic systems (PV), can contribute to a reduction in the power quality distribution grids due higher oscillations both absorption and generation. In this work, by means of statistical approach, supply at point common connection is evaluated for different PV sizes also levels aggregated loads sharing single installation happen multi-occupancy building. The role incentive schemes Switzerland UK driving choice specific size evaluated.