Afeka Academic College of Engineering
Agency: European Commission | Branch: H2020 | Program: MSCA-RISE | Phase: MSCA-RISE-2014 | Award Amount: 1.21M | Year: 2014
To meet the greenhouse gas reduction targets set by the European Commission and to reduce the reliance on imported energy sources from not-EU countries, the energy efficiency sector vitally needs basic analytical and decision support tools. This is especially true for large scale energy-consumer plants (for ex. foundries) but also for medical centres which typically (1) use large amounts of energy, (2) run a wide number of energy consuming machinery with different electrical profiles, (3) serve a weak population that may be heavily affected by energy shortages, (4) have a continuous level of service with special periodicity and peak times, and (5) have to abide to all sorts of strict regulations (for ex. special air quality requirements). The aim of this project is to create a tool that will provide medical centres and any other large institution involved in their energy efficiency programmes (governmental institutions, utilities providers, lending establishments, independent auditors, managers and technical staff), with information on the medical centres ideal energy consumption in different scenarios and on the most appropriate energy reduction plan for the medium-long term. The projects primary proposal is to identity the main variables that are responsible for the energy consumption in medical centres and give to each of them a weight. A novel mathematical model will be produced which will reproduce energy consumption in given scenarios. On the basis of the above model, the project will proceed to build a scenario-based assessment and a prediction tool. It will be used by energy managers and decision makers to evaluate and compare future investments and actions to reduce energy consumption, also on the basis of their economic return. The acquired knowledge and expertise will be embedded in a software prototype (E3s) that will be used as a decision support tool. The product of each phase will be tested in the four medical centres that support the project
Goldman I.,Afeka Academic College of Engineering
Acta Physica Polonica B | Year: 2011
We study the implications of asymmetric Dark Matter on neutron stars. We construct a "mixed neutron star" model composed of ordinary baryons and of asymmetric Dark Matter baryons. We derive the general relativistic structure equations for each specie, the equation for the mass within a given radius, and the redshift as function of radius. We present one specific numerical model as an illustrative example. In this example, the mass of the dark neutron equals half that of the ordinary neutron. The main results are: a total mass of 3:74M, a total mass within the neutron-sphere equaling 1:56M, the neutrons mass is 1:34M, the star radius is 31:9 km, the neutron-sphere radius is 11:1 km, and the redshifts from the neutronsphere and from the star surface are 0:72, 0:25, respectively. We comment briefly on possible astrophysical implications.
Flaxer E.,Afeka Academic College of Engineering
Review of Scientific Instruments | Year: 2011
In electron ionization source, electrons are produced through thermionic emission by heating a wire filament, accelerating the electrons by high voltage, and ionizing the analyzed molecules. In such a system, one important parameter is the filament emission current that determines the ionization rate; therefore, one needs to regulate this current. On the one hand, fast responses control is needed to keep the emission current constant, but on the other hand, we need to protect the filament from damage that occurs by large filaments current transients and overheating. To control our filament current and emission current, we developed a digital circuit based on a digital signal processing controller that has several modes of operation. We used a smart algorithm that has a fast response to a small signal and a slow response to a large signal. In addition, we have several protective measures that prevent the current from reaching unsafe values. © 2011 American Institute of Physics.
Flaxer E.,Afeka Academic College of Engineering
Review of Scientific Instruments | Year: 2014
We present a new design of a compact, ultra fast, high resolution and high-powered, pulse generator for inductive load, using power MOSFET, dedicated gate driver and a digital signal controller. This design is an improved circuit of our old version controller. We demonstrate the performance of this pulse generator as a driver for a new generation of high-pressure supersonic pulsed valves. © 2014 AIP Publishing LLC.
Drory A.,Afeka Academic College of Engineering
Foundations of Physics | Year: 2013
A recent paper suggested that if Galilean covariance was extended to signals and interactions, the resulting theory would contain such anomalies as would have impelled physicists towards special relativity even without empirical prompts. I analyze this claim. Some so-called anomalies turn out to be errors. Others have classical analogs, which suggests that classical physicists would not have viewed them as anomalous. Still others, finally, remain intact in special relativity, so that they serve as no impetus towards this theory. I conclude that Galilean covariance is insufficient to derive special relativity. © 2013 Springer Science+Business Media New York.
Contini M.,Tel Aviv University |
Goldman I.,Afeka Academic College of Engineering
Monthly Notices of the Royal Astronomical Society | Year: 2011
The spectra emitted from clouds near the Galactic Centre (GC) are investigated calculating the UV-optical-IR lines using the physical parameters and the element abundances obtained by the detailed modelling of mid-IR observations. Graphical representation of the spectra reveals strong lines. Characteristic line ratios calculated at the nebula provide information about the dereddened spectra emitted from regions near the GC. These line ratios are compared with those observed in active galaxies. We have found that the physical conditions in the nebulae near the GC are different from those of starburst galaxies and active galactic nuclei, namely, gas velocities and densities as well as the photoionization fluxes are relatively low. The geometrical thickness of the emitting filaments is particularly small suggesting that matter is strongly fragmented by instabilities leading to an underlying shock-generated turbulence. This is revealed by the power spectra of the radial velocities, of the mid-IR continuum flux and of the computed Si/H relative abundances. Moreover, turbulence could amplify the initial magnetic fields. © 2010 The Authors. Journal compilation © 2010 RAS.
Avineri E.,University of the West of England |
Avineri E.,Afeka Academic College of Engineering |
Owen D.E.,Laval University
Transportation Research Part A: Policy and Practice | Year: 2013
The provision of information about transport-related carbon dioxide (CO2) emissions to the traveler can be seen as an instrument to increase the likelihood of more sustainable choices being made by individuals. However, as transport-related CO2 emissions are largely seen as a 'social' cost rather than a 'private' cost to the individual, the behavioral engagement with and response to information on environmental effects of travel choices may be limited. It is argued that framing, studied in a range of contexts, can be used to enhance the evaluation of choice attributes and promote more sustainable choices. An experiment is reported that examines the effect of valence framing of amounts of CO2 emissions on the perceived differences between alternative amounts. Through the use of positive and negative terms, the information is framed to focus attention either on the potential of a travel mode to provide environmental benefit (positive frame) or on its potential to reduce environmental loss (negative frame). Survey participants' estimates of CO2 amounts were compared for positive and negative framing of the same information using an ordered logit model. The findings imply that negative framing is more effective than positive framing in highlighting differences between CO2 amounts of alternative travel modes and therefore is likely to influence travel-related choices. © 2012 Elsevier Ltd.
Afeka Academic College of Engineering | Date: 2011-12-13
A low power, low cost system and method for the detection of flow disturbances in a fluid dripping system is disclosed. In one embodiment, a light source and a light detector configured to monitor the amount of light passing through a droplet while the droplet is suspended and later falls from the tip of a tube. In another embodiment, dripping fluid is monitored from a system maintained part of the time in a sleep mode to conserve power, the system waking up at predetermined times to determine from detected light whether the monitored system is functioning properly.
Afeka Academic College of Engineering | Date: 2012-05-23
A system implements a camera to monitor a patient and medical devices. The cameras field of view is segmented into segments having images of the patient and the medical devices, and activities represented in the segmented images are designated for which to send a notification. Images captured by the camera are analyzed according to the field of view segmentation and the activity designation so it can be determined when the designated activities have occurred. A notification is executed when a designated activity has occurred. The system, which has a relatively low-cost and is easy to install, assists health care providers in monitoring a greater number of patients with minimal effect on the patients privacy.
Afeka Academic College of Engineering | Date: 2011-01-28
Monitoring devices by following and analyzing local current measurements and communicating the data over the power line. Various operation characteristics are extracted from the measurements, such as device profiles, operational status, various deficiencies and user related parameters. Current consumption profiles are derived from the accumulating data, and compared to previous patterns. The monitoring allows controlling operation of the devices, estimating their physical location and communicating messages from the devices regarding e.g. software status, by deliberate operation of the device to generate predefined current use patterns.