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Spin-polarization and x-ray magnetic circular dichroism in GaAs
S. Zohar,P.J. Ryan,J.W. Kim,D. J. Keavney 한국물리학회 2018 Current Applied Physics Vol.18 No.11
The combination of angular spin momentum with electronics is a promising successor to charge-based electronics. The conduction bands in GaAs may become spin-polarized via optical spin pumping, doping with magnetic ions, or induction of a moment with an external magnetic field. We investigated the spin populations in GaAs with x-ray magnetic circular dichroism for each of these three cases. We find strong anti-symmetric lineshapes at the Ga L3 edge indicating conduction ban
Atypical viscous fracture of human femurs
Yosibash, Zohar,Mayo, Romina Plitman,Milgrom, Charles Techno-Press 2014 Advances in biomechanics & applications Vol.1 No.2
Creep phenomenon at the scale of bone tissue (small specimens) is known to be present and demonstrated for low strains. Here creep is demonstrated on a pair of fresh-frozen human femurs at the organ level at high strains. Under a constant displacement applied on femur's head, surface strains at the upper neck location increase with time until fracture, that occurs within 7-13 seconds. The monotonic increase in strains provides evidence on damage accumulation in the interior (probably damage to the trabeculae) prior to final fracture, a fact that hints on probable damage of the trabecular bone that occurs prior to the catastrophic fracture of the cortical surface layer.
Beyond 5G: Reducing the Handover Rate for High Mobility Communications
Naor Zohar 한국통신학회 2022 Journal of communications and networks Vol.24 No.2
The fifth-generation (5G) and beyond cellular networksare expected to support a huge number of mobile devices,roaming seamlessly across very small cells. Consequently, thehandover rate for these extremely dense networks is expected tobe very high. To reduce the burden caused by rapid handoverrequests, and to support a massive number of highly mobiledevices in 5G and beyond networks, this study suggests usingproximity-based clusters as nomadic cells integrated with AerialAccess Networks (AANs). These nomadic cells are formed bytwo-levels hierarchical partitioning of the mobile devices intoproximity-based clusters. Previous distributed mobility management schemes are notsufficiently efficient to support the handover rate expected for5G and beyond networks. Due to their high computationalcomplexity, previous group-based methods are not applicable forreal-time services. In contrast to these schemes, the proposedscheme is scalable with the number of devices. Moreover, thecreation of a mobility group raises practical as well as securityand privacy issues that were overlooked by previous schemes. These issues are addressed in this study.
Innovative, DPN‑Based Method for Analyzing the Early Stages of Mg Corrosion Under Natural Conditions
Moshe Zohar,Dror Shamir,Guy Ben‑Hamu,Ariela Burg 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.11
Mg and its alloys are highly prone to corrosion, which is an important consideration in many industries and applications. However, most available methods for studying the buildup of Mg corrosion layers as a function of time—an indirect measureof corrosion rate—are not sufficiently sensitive to monitor the early stages of the process. In this letter, a simple and innovativemethod is reported for monitoring changes in Mg corrosion layer thickness in various solutions, under close-to-naturalconditions and starting from the first minutes of the process. Dip-pen nanolithography (DPN) was first used to patternpoly(methyl methacrylate) (PMMA) reference lines on the surface of the Mg alloy AE53, so as to indicate the initial conditions. Then, AFM was used—for the first time to the best of our knowledge—to measure the thickness of corrosion layersforming on three adjacent 100 μm × 100 μm surface areas at several time points (5–30 min) after immersion in solution. Testsolutions included either saline or phosphate-buffered saline (PBS), in each case either with or without the addition of Fentonreagents, which are known to accelerate corrosion and are highly relevant for biological implants that employ Mg alloys asdegradable substrates. In all tested solutions, the buildup of corrosion layers showed the expected dynamics—namely, anincrease followed by a decrease and again an increase in layer thickness; however, the layers were considerably thicker inPBS than in saline, and in solutions with Fenton reagents than in those without them. These results demonstrate the uniqueadvantage of the AFM instrument, as compared with other methods (such as SEM and potentiodynamic polarization), formeasuring corrosion buildup, as the layer growth process can be accurately measured under natural conditions, in the presenceof solutions, and from its very early stages.
Tracking Controllers for Aerial Vehicles Subject to Restricted Inputs and Wind Perturbations
Ilan Zohar,Amit Ailon 제어·로봇·시스템학회 2013 International Journal of Control, Automation, and Vol.11 No.3
This study establishes controllers for achieving trajectory tracking for the kinematic models of unmanned aerial vehicles subject to bounded inputs and windy conditions with additive perturbations. The proposed control scheme allows the application of smooth hyperbolic functions which sat-isfy physical conditions and input restrictions and can easily be realized. Various examples and simulation demonstrations (including Google Earth toolbox application) along with discussions about the ob-tained results are presented.
Julio Wainstein,Zohar Landau,Yosefa Bar Dayan,Daniela Jakubowicz,Torsten Grothe,Tania Perrinjaquet-Moccetti,Mona Boaz 한국식품영양과학회 2016 Journal of medicinal food Vol.19 No.2
Purslane extract (PE) is derived from Portulaca oleracea L., a medicinal plant used in traditional medicine for its antidiabetic properties. This randomized, placebo-controlled clinical trial was designed to evaluate the efficacy and safety of PE in improving glucose control, blood pressure, and lipid profile in adults with type 2 diabetes mellitus (T2DM) treated with a single oral hypoglycemic agent at baseline. Subjects were randomized to treatment with three capsules of PE/day or a matched placebo. Change from baseline to the week 12 end-of-follow-up visit measures of glucose homeostasis, hemodynamics, and lipid profile was compared by treatment assignment. In addition, these measures were evaluated in a subgroup of ‘‘responders,’’ defined as patients whose week 12 HbA1c was lower than baseline values, regardless of treatment assignment. This group was further assessed in subgroups of baseline oral hypoglycemic treatment. A total of 63 participants were treated with either PE (n = 31, 11 females, mean age 52.4 ± 7.9 years) or matched placebo (n = 32, 11 females, mean age 58.3 ± 10.8 years). In the total cohort, systolic blood pressure declined significantly more in the PE group than the placebo group: -7.5 ± 5.0 versus -0.01 ± 0.3 mmHg, P < .0001. In the responders’ subgroup, HbA1c declined significantly more in the PE group than the placebo group: -0.8% ± 0.4% versus -0.6% ± 0.5%, P = .03. Few adverse events were reported. These were mild and did not differ by treatment assignment. PE appears to be a safe, adjunct treatment for T2DM, significantly reducing systolic blood pressure in the total cohort and HbA1c in the subgroup of responders.
Amit Ailon,Ilan Zohar 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
This study presents simple controllers for achieving trajectory tracking for kinematic models of unmanned aerial vehicles with bounded inputs under various wind conditions. Application of the approach to group control, in particular for flying UAVs in a string-like formation in the presence of additive wind perturbations is demonstrated. Simulation results demonstrate some of the proposed controller performances.