Search results

Sparse, non-negative signals occur in many applications. To recover such signals, estimation posed as non-negative least squares problems have proven to be fruitful. Efficient algorithms with high accuracy have been proposed, but many of them assume either perfect knowledge of the dictionary generating the signal, or attempts to explain deviations from this dictionary by attributing them to compon

In this work, we propose a time-recursive multi-pitch estimation algorithm, using a sparse reconstruction framework, assuming only a few pitches from a large set of candidates to be active at each time instant. The proposed algorithm utilizes a sparse recursive least squares formulation augmented by an adaptive penalty term specifically designed to enforce a pitch structure on the solution. When e

A growing political interest in the development of biorefineries is being shaped by climate change and a need to develop economically viable substitutes (i.e., fuels, products and chemicals) to those produced in traditional oil refineries. The pulp and paper industry in Sweden has been stagnating and it is therefore potentially promising to integrate biorefining into its activities as one way of d

Teachers have high occupational voice demands. The voice load of teachers is both environmental and individual. Little is known about the teachers' own view of the contribution from the environment and about the teachers' voice use at their work-place. Aim: The purpose was to investigate the voice use and prevalence of voice problems in teachers and to explore their ratings of vocally loading aspe

This authoritative Handbook examines the current state and the future needs of international law in addressing the key activities that pose threats to the marine environment. Its chapters explore the legal framework for protection of the marine environment, pollution of the marine environment, seabed activities and the marine environment, protection of marine biodiversity, regional approaches to t

We present compact modeling, DC and RF characterization of lateral and vertical nanowire MOSFETs. Lateral tri-gate nanowire devices on InP substrates have demonstrated a maximum gm=2.95 mS/ μm at VDS=0.5 V, and fT/fmax=290/350 GHz. Vertical gate-all-around InAs wires integrated on Si substrates have demonstrated gm=1.35 mS/μm and fT/fmax=100/155 GHz. We also demonstrate a non- parabolic, ballistic

This study documents conodont faunas of the Fezouata Formation, recovered from the AZ-1 borehole at Adrar Zouggar Mountain and from outcrops near Zagora in south-eastern Morocco. The Fezouata Formation was deposited on the peri-Gondwanan shelf near the South Pole during Early Ordovician times. It is composed of mostly fine-grained siliciclastics and is well known for including beds displaying the

Environmental research infrastructures (RIs) support their respective research communities by integrating large-scale sensor/observation networks with data curation services, analytical tools and common operational policies. These RIs are developed as pillars of intra-and interdisciplinary research, however comprehension of the complex, pathologically interconnected aspects of the Earth's ecosyste

This work focuses on the investigation on both local and global dielectric properties for a random wound single tooth winding, which represents a segment of the in-field electrical machine used on an Hybrid Wheel Loader. Finite Element Analysis (FEA) is used to predict the temperature stress while loading and illustrate the influences of dielectric properties (i.e. conductivity and dielectric cons

We focus on the problem of semantic segmentation based on RGB-D data, with emphasis on analyzing cluttered indoor scenes containing many visual categories and instances. Our approach is based on a parametric figureground intensity and depth-constrained proposal process that generates spatial layout hypotheses at multiple locations and scales in the image followed by a sequential inference algorith

We carry out bipolar Monte Carlo (MC) simulations of electron and hole transport in a multi-quantum well light-emitting diode with an electron-blocking layer. The MC simulation accounts for the most important interband recombination and intraband scattering processes and solves self-consistently for the non-quasiequilibrium transport. The fully bipolar MC simulator results in better convergence th

This explanatory analysis of the relevant literature seeks to identify factors affecting quality in massive open online courses (MOOCs). The paper highlights sub-dimensions of quality in MOOCs using the ladder of analytical abstraction. Communication, trust, collaboration, inclusiveness, innovation, and commitment are identified as key elements in developing a quality culture in online education.

Asteroseismology has the capability of delivering stellar properties which would otherwise be inaccessible, such as radii, masses and thus ages of stars. When this information is coupled with classical determinations of stellar parameters, such as metallicities, effective temperatures and angular diameters, powerful new diagnostics for stellar and Galactic studies can be obtained. The ongoing Strö

The presence of OH radicals as a marker of the high temperature reaction region usually has been used to determine the lift-off length (LOL) in diesel engines. Both OH Laser Induced Fluorescence (LIF) and OH∗ chemiluminescence diagnostics have been widely used in optical engines for measuring the LOL. OH∗ chemiluminescence is radiation from OH being formed in the exited states (OH∗). As a conseque

It has been proven that partially premixed combustion (PPC) has the capability of high combustion efficiency with low soot and NOx emissions, which meet the requirements of increasingly restricted emission regulations. In order to obtain more homogenous combustion and longer ignition delay in PPC, different fuel injection strategies were employed which could affect the fuel air mixing and control

While software is becoming more complex everyday, the requirements on its behavior are not getting any easier to satisfy. An application should offer a certain quality of service, adapt to the current environmental conditions and withstand runtime variations that were simply unpredictable during the design phase. To tackle this complexity, control theory has been proposed as a technique for managi