Shlosman K.,Technion IIT |
Rosen-Kligvasser J.,Technion IIT |
Suckeveriene R.,Technion IIT |
Suckeveriene R.,Kinneret College |
And 2 more authors.
European Polymer Journal | Year: 2017
This paper focuses on the development of a novel modification method of commonly used antifog (AF) additives such as glycerol monooleate (GMO) and sorbitan monooleate (SMO). In this method, the AF organic molecules were grafted to vinyl silane, methacryl-oxypropyl-trimethoxy-silane (MEMO), to form MEMO grafted GMO (MEMO-g-GMO) and MEMO grafted SMO (MEMO-g-SMO). A thorough study of linear low density polyethylene (LLDPE) containing the modified AF (LLDPE/MEMO-g-AF) was performed, including investigation of the additives' migration from the LLDPE matrix. Thermal gravimetric analysis (TGA) and Fourier transform IR (FTIR) measurements showed a successful grafting of GMO and SMO to MEMO. Thermal analysis showed that 1 part per hundred parts resin (phr) MEMO-g-GMO has no effect on the thermal decomposition of LLDPE. According to hot fog test results, it was found that only LLDPE films containing 1 phr MEMO-g-GMO exhibited excellent antifog performance, while LLDPE films containing 1 phr MEMO-g-SMO exhibited poor antifog performance. It was found that LLDPE/MEMO-g-GMO system is characterized by a slower AF migration rate and a lower diffusion coefficient, compared to the reference system, LLDPE/GMO; these results are well correlated with the hot fog test results. Morphological studies revealed a fine dispersion of the MEMO-g-GMO in the polymer. © 2017 Elsevier Ltd
Boniel-Nissim M.,Haifa University |
Boniel-Nissim M.,Kinneret College |
Tabak I.,Institute of Mother and Child |
Mazur J.,Institute of Mother and Child |
And 8 more authors.
International Journal of Public Health | Year: 2014
Objectives: To examine the impact of electronic media (EM) use on teenagers’ life satisfaction (LS) and to assess the potential moderating effect of supportive communication with parents (SCP). Methods: Data were drawn from the cross-national Health Behaviour in School-aged Children (HBSC) study (2009/2010) in Canada, England, Germany, Hungary, Italy, Israel, The Netherlands, Poland and Scotland. Sample size: 53,973 students aged 11–15 years. Results: More hours per day spent on the computer were associated with lower LS; more EM communication with friends with higher LS. This relationship became negative if EM use reached and exceeded a certain threshold. SCP moderated the effect of EM communication with friends, but not computer use for the total sample. SCP seems to be more important than computer use or EM communication with friends for LS and it seems to buffer negative effects of EM use. Conclusions: Communication with parents seems to buffer the negative effects of EM use on LS during adolescence. Higher computer use was related to lower LS, but “optimal” frequency of EM communication with friends was country specific. © 2014, Swiss School of Public Health.
PubMed | Bar - Ilan University, Technion - Israel Institute of Technology, Kinneret College, Maccabi Healthcare Services and Poria Hospital
Type: | Journal: International journal for quality in health care : journal of the International Society for Quality in Health Care | Year: 2017
To compare the effectiveness of two methods in encouraging the consideration of a leap from one patient management routine to another: (i) real-time review of the facts by an external medical team (ii) implementation of the re-thinking-protocol (de-Freezing) by both treating and external medical teams.Students accompanied doctors, nurses and patients as non-interrupting observers. When an obvious gap between the expected and actual findings occurred, it was discussed four times: by two teams (treating team, external medical team) in two discussion modes (real-time review, de-Freezing-questionnaire). The students then recorded if a leap was considered for each discussion.The study was conducted in the emergency department of the Baruch Padeh Medical Centre, Poriya, Israel.All patients were included during times when both medical teams (treating, external) were present.During 14 periods of 5-7 h each, 459 patients were sampled. In 183 patients, 200 gaps were discovered.The external team considered a leap 76 times, compared with 47 by the treating team (P < 0.001). Using the de-Freezing-protocol, the treating team considered a leap 133 times. Interestingly, even the external team benefited from the de-Freezing protocol and considered a leap 140 times (NS compared to the treating team).While the importance of timely leaping from one patient management routine to another is emphasized in the training of physicians, medical teams too often fail to do so. The de-Freezing-protocol inexpensively encourages the consideration of a leap beyond what is evoked by the involvement of an external team. The protocol is applicable to all medical processes and should be incorporated into medical practice and education.
Leitner T.,TowerJazz Semiconductor |
Feiningstein A.,TowerJazz Semiconductor |
Turchetta R.,Rutherford Appleton Laboratory |
Coath R.,Rutherford Appleton Laboratory |
And 10 more authors.
IEEE Transactions on Electron Devices | Year: 2013
This paper presents the key features of single photon avalanche diode (SPAD) devices fabricated in a low voltage commercial 180-nm CMOS image sensor technology exhibiting very low dark count rate (DCR). The measured DCR is < 100 Hz at room temperature even for excess voltages above 2 V. The active junction of the SPAD measures 10 μm in diameter within a 24-μm test structure. The active region where Geiger avalanche occurs is determined by an implanted charge sheet. Edge avalanche is averted by utilizing a virtual guard ring, formed by the retrograde well profile. The design, measurements, and simulations of doping and electric field profiles that lead to such low DCR are reported and analyzed. The current-voltage characteristics and the temperature dependence of the breakdown voltage provide further, indirect evidence for the low DCR measured in the device. Thus, the key features of measured good SPADs are presented and are correlated with simulations that give physical insight on how to design high-performance SPADs. © 1963-2012 IEEE.
Berger I.,Tel Aviv University |
Dvir Y.,Ohalo College |
Dvir Y.,Kinneret College |
Leshem Y.,Tel Aviv University |
And 2 more authors.
Acta Ethologica | Year: 2013
Although 90 % of all bird species are monogamous, many species practice alternative reproductive strategies as extra-pair copulations, intra-specific brood parasitism, and quasi-parasitism. In territorial monogamous species, both partners hold and defend the territory from intruders. Often, the intruders are males and usually the local male banishes the intruders. Indeed, many studies focused on the response of the local male toward intruder males. However, the benefits and costs associated with the responses of the local male toward intruder females have been largely overlooked. Focusing mainly on alternative reproductive strategies, we developed a model to predict the aggression a monogamous male may demonstrate toward an intruder female during the pre-egg laying stage of his local female partner. This model demonstrates that the intensity of aggression that the local male shows toward an intruder female depends on the extra-pair copulations that his local female partner may perform. Further, the aggression also depends upon intra-specific brood parasitism and quasi-parasitism that might be carried out by the intruder female. Our approach suggests that when considering mating strategies, there is a need to assess how these three alternative reproductive strategies may affect the local male's aggression toward intruder females. © 2013 Springer-Verlag Berlin Heidelberg and ISPA.
Avni E.,Haifa University |
Cohen R.,Kinneret College |
Snir S.,Haifa University
Systematic Biology | Year: 2015
Despite impressive technical and theoretical developments, reconstruction of phylogenetic trees for enormous quantities of molecular data is still a challenging task. A key tool in analyses of large data sets has been the construction of separate trees for subsets (e.g., quartets) of sequences, and subsequent combination of these subtrees into a single tree for the full set (i.e., supertree analysis). Unfortunately, even amalgamating quartets into a supertree remains a computationally daunting task. Assigning weights to quartets to indicate importance or reliability was proposed more than a decade ago, but handling weighted quartets is even more challenging and has scarcely been attempted in the past. In this work, we focus on weighted quartet-based approaches. We propose a scheme to assign weights to quartets coming from weighted trees and devise a tree similarity measure for weighted trees based on weighted quartets. We also extend the quartet MaxCut (QMC algorithm) to handle weighted quartets. We evaluate these tools on simulated and real data. Our simulated data analysis highlights the additional information that is conveyed when using the new weighted tree similarity measure, and shows that extending QMC to a weighted setting improves the quality of tree reconstruction. Our analyses of a cyanobacterial data set with weighted QMC reinforce previous results achieved with other tools. © The Author(s) 2014. Published by Oxford University Press, on behalf of the Society of Systematic Biologists. All rights reserved.
Nemirovsky Y.,Technion - Israel Institute of Technology |
Corcos D.,Technion - Israel Institute of Technology |
Brouk I.,Moscow Institute of Aircraft Technology |
Nemirovsky A.,Kinneret College |
Chaudhry S.,Technion - Israel Institute of Technology
IEEE Instrumentation and Measurement Magazine | Year: 2011
Complementary metal-oxide-semiconductor (CMOS) technology is dominant in the microelectronics industry for a wide range of applications, including analog, digital, RF, and sensor systems. The advantages of silicon CMOS technology compared to bipolar technology as well as transistors in other semiconductors is well-established. CMOS technology scaling has been a main drive for continuous progress in the silicon based semiconductor industry over the past two decades . The continuous downscaling of CMOS technologies towards nano feature size has increased the performance of integrated circuits considerably. However, one important limitation of MOSFET downscaling is an increase of 1/f noise (often referred to as low-frequency noise), since the 1/f noise increases as the reciprocal of the device area , . Furthermore, the development of nano-sized CMOS technologies has led to the observation of random telegraph signals (RTS)  yielding large low frequency current fluctuations. Excessive low-frequency noise introduces serious limitations on the functionality of analog and digital circuits since it deteriorates the noise figure of operational amplifiers and A/D and D/A converters. Lowfrequency noise diminishes the signal-to-noise-ratio (SNR) of CMOS sensors, such as IR or CMOS image sensors  . The 1/f noise is also of paramount importance in RF circuit applications where it gives rise to phase noise in oscillators or multiplexers . The 1/f noise is a sensitive diagnostic tool to monitor radiation effects on MOSFETs . © 2011 IEEE.
Brook I.,Technion IIT |
Tchoudakov R.,Technion IIT |
Suckeveriene R.Y.,Technion IIT |
Suckeveriene R.Y.,Kinneret College |
Narkis M.,Technion IIT
Polymers for Advanced Technologies | Year: 2015
This work demonstrates the development of electro-mechanical sensors using a generic methodology based on elastomeric conductive nanocomposites. A fast and facile fabrication route is used to construct a unique architecture based on polymerization of aniline in the presence of dissolved styrene-isoprene-styrene (SIS) tri-block copolymer and carbon nanotubes (CNT), followed by a precipitation-filtration step. The resulting nanocomposites form a segregated network of conductive pathways containing CNT. The percolation threshold calculated for aniline and CNT is 0.8 and 0.2wt%, respectively. The electro-mechanical sensors have demonstrated a stable and fast dynamic response with a uniform electrical amplitude to the applied strain cycles for two diverse polymer matrices. An accurate dynamic behavior, where the maximum peak of relative electrical resistance coincides with the maximum strain peak, was achieved. The relatively high calculated sensitivity factor (gauge factor) demonstrates that the nanocomposites developed possess good sensing performance. The unique method used for the preparation of SIS/CNT/polyaniline nanocomposites, results in new strain sensors and it can be utilized for evaluation of constructive damage in different composite structures. © 2015 John Wiley & Sons, Ltd.
Aharoni A.,Kinneret College |
Aharoni A.,Haifa University |
Reinhartz-Berger I.,Kinneret College
Journal of Database Management | Year: 2011
Situational methods are approaches to the development of software systems that are designed and constructed to fit particular circumstances that often refer to project characteristics. One common way to create situational methods is to reuse method components, which are the building blocks of development methods. For this purpose, method components must be stored in a method base, and then retrieved and composed specifically for the situation in hand. Most approaches in the field of situational method engineering require the expertise of method engineers to support the retrieval and composition of method components. Furthermore, this is usually done in an ad-hoc manner and for pre-defined situations. In this paper, the authors propose an approach, supported by a tool that creates situational methods semi-automatically. This approach refers to structural and behavioral considerations and a wide variety of characteristics when comparing method components and composing them into situational methods. The resultant situational methods are stored in the method base for future usage and composition. Based on an experimental study of the approach, the authors show that it provides correct and suitable draft situational methods, which human evaluators have assessed as relevant for the given situations. © 2011, IGI Global.
Kovalev I.,Kinneret College
International Journal of Flow Control | Year: 2014
An experimental investigation was conducted of the effect of 'butterfly skin' (metallic version of the butterfly scale) with rough internal surface on vibration and aerodynamic performances of a two-dimensional, 100-mm chord, NACA-230 airfoil oscillating through simulation of flare maneuver, in a 250 x 750 mm low-speed straight through a wind tunnel. Attention was initially directed to this problem by observation of the rough surfaces of butterfly wing scale as well as other studies indicating the vibration suppression of flying butterfly and the better lift of these wings by wing appendages. Results indicated that the 'butterfly skin' increased the lift force by a factor of 1.05, and reduced both the duration of vibration by a factor of 1.13, and the frequency of an oscillating airfoil by a factor of 1.5. The modification of the vibration effects on the rotor blade model was due both to an increase in the added mass, which influences the 'the butterfly skin', and to a decrease of the internal air flow velocity by aerodynamically rough surfaces of the air cavity. The total air mass which influences the slender wing with the 'butterfly skin' was represented as the sum of air mass of three geometrical figures: a circular cylinder around the wing and two right-angled parallelepipeds within the air cavity. The "butterfly skin" can have constant clear spacing of the air cavity or tapered air cavity. The interaction mechanism of a 'butterfly skin' with a flow is also described.