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A Finite Element Model of Near-Field Scanning Microwave Microscopy
Barry Friedman,이기진,Brian Oetiker 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.3
A model of a near field scanning microwave microscope has been investigated via numerical simulation using the finite element method. Despite being simplified so as to be axially symmetric, the model is in qualitative agreement with measurements on non-conducting samples. As well as frequency shifts, the reflection coefficient S11 has been calculated as a function of frequency with no adjustable parameters. A model of a near field scanning microwave microscope has been investigated via numerical simulation using the finite element method. Despite being simplified so as to be axially symmetric, the model is in qualitative agreement with measurements on non-conducting samples. As well as frequency shifts, the reflection coefficient S11 has been calculated as a function of frequency with no adjustable parameters.
The GALEX Ultraviolet Variability Catalog
Welsh, Barry Y.,Wheatley, Jonathan M.,Heafield, Kenneth,Seibert, Mark,Browne, Stanley E.,Salim, Samir,Rich, R. Michael,Barlow, Tom A.,Bianchi, Luciana,Byun, Yong-Ik,Donas, Jose,Forster, Karl,Friedman, American Institute of Physics 2005 The Astronomical journal Vol.130 No.2
<P>We present version 1.0 of the NASA Galaxy Evolution Explorer (GALEX) ultraviolet variability (GUVV) catalog, which contains information on 84 time-variable and transient sources gained with simultaneous near-ultraviolet (NUV) and far-ultraviolet (FUV) photometric observations. These time-variable sources were serendipitously revealed in the various 1<img entity='fdg' SRC='http://ej.iop.org/icons/Entities/fdg.gif' ALT='fdg' ALIGN='BASELINE' />2 diameter star fields currently being surveyed by the GALEX satellite in two ultraviolet bands (NUV 1750–2750 Å, FUV 1350–1750 Å) with limiting AB magnitudes of 23–25. The largest amplitude variable objects currently detected by GALEX are M dwarf flare stars, which can brighten by 5–10 mag in both the NUV and FUV bands during short-duration (<500 s) outbursts. Other types of large-amplitude ultraviolet variable objects include ab-type RR Lyrae stars, which can vary periodically by 2–5 mag in the GALEX FUV band. This first GUVV catalog lists galactic positions and possible source identifications in order to provide the astronomical community with a list of time-variable objects that can now be repeatedly observed at other wavelengths. We expect the total number of time-variable source detections to increase as the GALEX mission progresses, such that later version numbers of the GUVV catalog will contain substantially more variable sources.</P>
Strengthening the Competitiveness, Productivity and Innovation of Cross-border Industrial Corridors
Charles Conteh,박지영,Kathryn Friedman,황하,Barry Wright 아시아기술혁신학회 2023 Asian Journal of Innovation and Policy Vol.12 No.1
Over the past few decades, globalization has been shifting economic power upward to transnational actors on the one hand, and downward to subnational or regional spaces on the other. This phenomenon has resulted in the centrality of territorially delimited subnational regions acting as critical loci of economic governance within a complex and globally distributed value chain of trade and service flows. Within this broader context of industrial restructuring are economic regions that span national borders in their collective assets. The paper focuses on investigating the economic competitiveness and productivity of cross-border (or binational) economic regions. Using the conceptual framework of economic clusters, an econometric model that measures proxies of geographic proximity of firms in the life sciences cluster, and a new binational economic model, the paper examines the key characteristics, potentials and constraints of economic competitiveness and productivity in a cross-border region comprising counties in Western New York and regional municipalities in Southern Ontario. The findings demonstrate the direct and indirect benefits of closer cross-border economic cooperation. The paper then concludes with some policy observations about leveraging cross-border economic clusters for strategic industrial cooperation.
Noncontact characterization of glucose by a waveguide microwave probe
김승완,Jongchel Kim,알센바바쟈얀,이기진,Barry Friedman 한국물리학회 2009 Current Applied Physics Vol.9 No.4
We investigate the electromagnetic field interaction with a glucose aqueous solution using a microwave dielectric waveguide probe to evaluate the glucose concentrations. A microwave dielectric waveguide probe allows observation of the small variation of the glucose concentration changes in the range of 0–300 mg/ml by measuring the change of the microwave reflection coefficient. We could observe the effect of concentration change of glucose with a detectable resolution up to 0.5 mg/ml at an operating frequency of about f = 2.0–2.5 GHz. The change of the glucose concentration is directly related to the change of the reflection coefficient due to the electromagnetic interaction between the dielectric waveguide resonator and the glucose aqueous solution. The operational principal is explained by a plane-wave solution model. A glucose biosensor using a microwave dielectric waveguide probe provides a unique approach for glucose monitoring.
In vitro monitoring of goat-blood glycemia with a microwave biosensor
김승완,김종철,김경철,이정하,Arsen Babajanyan,Barry Friedman,이기진 한국물리학회 2014 Current Applied Physics Vol.14 No.4
We used an electromagnetic microwave cavity sensor for real time measurement of the glycemia in goatblood for three animals. We could determine the concentration of D-glucose in blood in the range of 90 e550 mg/dl at the resonance frequency near 4.76 GHz with a bandwidth of 300 MHz. The change in microwave reflection coefficient S11 (due to the variation of D-glucose concentration in blood) was about 16.33 dB, 23.92 dB, 7.66 dB and resonance frequency shift was about 21.78 MHz, 36.29 MHz, 20.77 MHz, respectively, for the three different samples. The in vitro results show the measured signal-to-noise ratio of about 32 dB, and the minimum detectable signal level of about 0.025 dB/(mg/dl). The results clearly show the sensitivity and usefulness of this microwave sensor for these types of biological investigations. This proposed system provides a unique approach for real contactless glucose monitoring and, it may serve as a bloodless glucometer for the calibration of different glucose levels.
Arakelyan, Shant,Lee, Hanju,Han, Do-Suck,Babajanyan, Arsen,Berthiau, Gerard,Friedman, Barry,Lee, Kiejin Professional Technical Group on Microwace Theory a 2018 IEEE Transactions on Microwave Theory and Techniqu Vol. No.
<P>The visualization of carbon fibers polyether ether ketone (PEEK) composite material heating for a grounded coplanar waveguide and a stepped impedance low-pass filter by the thermal camera is performed. The purpose of such visualization is to characterize electromagnetic field influence on the diagonally anisotropic composite material and find out its application opportunity. COMSOL Multiphysics simulation has been done in order to understand heating principles and origin. Experimental results were in a good agreement with simulations and they showed that the characteristics of the microstrip structures can be modulated/tuned by simple rotation of the composite material. Finally, a tunable application by the carbon/PEEK composite material for the microstrip low-pass filter was developed due to the microwave absorption selectivity dependence on the composite material orientation.</P>
Arakelyan, Shant,Lee, Hanju,Babajanyan, Arsen,Kim, Seungwan,Berthiau, Gerard,Friedman, Barry,Lee, Kiejin IEEE 2019 IEEE antennas and propagation magazine Vol.61 No.2
<P>Using the thermoelastic optical indicator microscopy (TEOIM) technique, we perform the visualization of the near-field distribution of a patterned frequencymodulation (FM) antenna. For the defect characterization, subtraction of images is done, whereas a background image is used for the defect-free antenna image. The electromagnetic fields distribution in the overall antenna structure is changed due to the defects, and this indicates the local impedance changes of the antenna pattern. The sensitivity of the proposed inspection technique is estimated to be in orders of a few milliwatts. In addition, a 3D visualization of the antenna transmission is realized to describe the field intensity and distribution dependences on the distance from the antenna surface. This type of investigation with a visualization opportunity may become an important tool for engineers and researchers, and it can successfully be a supplement for existing measurement techniques.</P>