Filter Results
134 results
  • The singularities of the integrand are a group of poles, most of which have large imaginary parts and do not represent any physical solution (not shown). Only a single pole with a small imaginary part in some frequency region corresponds to an observable magnonic solution. Note that due to regularity of the expression with respect to k, all singularities of the integrand are attributable to the matrix . This means that coordinates of the poles are provided by the equation , which is equivalent to the dispersion equation GOTOBUTTON ZEqnNum225748 \* MERGEFORMAT (S.13). That confirms that a localized source excites the same wave as described by the dispersion equation.... In this Section, we describe a model for oscillation of a magnetic moment of an individual particle. Each particle is a sphere of radius a made of yttrium iron garnet (YIG). We choose it for its record low damping making it the most suitable for magnonic purposes. All particles are placed in the external static magnetic field and magnetized to saturation in the direction of the chain axes. The dynamic susceptibility tensor is given by the Polder tensor []... Eq. GOTOBUTTON ZEqnNum333740 \* MERGEFORMAT (S.5) is a starting point in the further analysis of magnetic oscillations in single and double magnonic chains.... In this Section, we study spin waves eigenmodes, i.e., collective oscillations of magnetic moments guided by a double chain of magnetic particles (see Fig. S3). Interaction of the chain with an external source and excitation of spin waves is considered in Section 5 of this Supplementary.
    Data Types:
    • Dataset
    • Document
  • Oscillation strain... Angular frequency
    Data Types:
    • Tabular Data
    • Dataset
  • Oscillation strain... Angular frequency
    Data Types:
    • Tabular Data
    • Dataset
  • Oscillation strain... Angular frequency
    Data Types:
    • Tabular Data
    • Dataset
  • Hybrid organic-inorganic perovskite (HOIP) exhibit low cost, versatility in fabrication methods and possess good application potential because of high power conversion efficiency. Methylammonium lead Iodide (MAPbI3) with quartz substrate thin film sample (glass encapsulated) was obtained from NC State University have been used to obtain millimeter wave (mmw) transient response at probe frequencies of 140 and 150 GHz from CIDO and BWO sources respectively. The HOIP film was produced at NC State University on May 02, 2017. In our time-resolved TR-mmWC apparatus, the glass-covered sample was excited by a 1KHz triggered 532 nm laser beam with a width of 0.7 ns with maximum fluence 10 microJoules per sq. cm and a spot size of 10mm. Transient datasets were recorded using a 6 GHz input bandwidth digitizer after amplifying Schottky detector registered radiofrequency (RF) signal due to differential absorption of the passing millimeter wave from source (normal to sample) at 140 and 150 GHz through sample. Signal averaging was done 4096 times and data were collected on 4 different dates spanning 2, 6, and 8 months and 1 year from date of manufacture. A general trend of increase in radiative and trap-assisted recombination lifetimes of charge carriers was noted, and a decrease in amplitudes were also noted after fitting data by double exponential. The fits are obtained by adding a second excitation to account for double peaks. Transient data attached are CSV files with column 1 being the pump-probe delay time (second), and column 2 being voltage response (V). The low noise amplifier gain of 15.527 dB must be accounted for June 28, 2017, December 18, 2017, and February 21, 2018 datasets and a gain of 15.91 dB must be accounted for the data file obtained on May 03, 2018 to yield the actual voltages. File with name “NCSU-Perovskite-CIDO-6-140GHz-3-26-RF-Average-FullLaserPower-June-28-2017” is obtained using a solid state IMPATT cavity oscillator operated at 140 GHz with 10 mW output power and after illuminating the sample with full laser power (22.14 mW). Filename: “NCSU-Perovskite-BWO-150GHz-1KHz-FullLaserPower-Dec-18-2017” is the average transient for the same sample obtained on December 18, 2017 but using an electrovacuum backward wave oscillator as probe source that is operated at 30% power level to transmit the same output power ~ 10 mW and further use of only about 0.32 mW for probing (in all cases using abeam splitter); Filename: “NCSU-Perovskite-BWO-150GHz-4096Sa-FullLaserPower-Feb-21-2018” is obtained for February 21, 2018 and filename: “NCSU-Perovskite-150GHz-BWO-1.6NDLaserPower-May-03-2018” is obtained in the same fashion as others except for the fact that the stimulating laser pulse fluence was reduced to ~ 0.3 microJoules per sq. cm.
    Data Types:
    • Tabular Data
    • Dataset
  • Oscillation strain... Angular frequency
    Data Types:
    • Tabular Data
    • Dataset
  • Oscillation strain... Angular frequency
    Data Types:
    • Tabular Data
    • Dataset
  • Oscillation strain... Angular frequency
    Data Types:
    • Tabular Data
    • Dataset
  • Dual-band bandpass impedance matching network is designed to match the input impedance of a single-Voltage Doubler (VD) rectifier to a resistive port (50 ). The matching network should consist of an LC bandpass matching topology (fourth order) at the first frequency and a modified L-network (second order) to cover the second frequency.... Absorber Frequency-Selective Surface (FSS)... A dual polarisation square patch antenna is used to collect the RF energy at a central frequency of 2.45 GHz.... Low Voltage Charge Pump, On-Chip Ring Oscillator... PLL in closed loop condition locks the voltage-controlled oscillator (VCO) to a multiple of the RF input frequency and allows frequency-shift keying (FSK) data recovery. PLL in open-loop condition-VCO signal is used to generate the uplink carrier, thus enabling active transmission without requiring external quartz for frequency reference.
    Data Types:
    • Image
    • Tabular Data
    • Dataset
  • Objective/hypothesis: We hypothised that frequency and intensity of stimulation somehow relate with each other. Our goal was to select the optimal frequency with low intensity for PD. We clarified the importance of age in the effect of rTMS.... Van Merhaegen-Wieleman, A., Parys, E., De Keyser, J., Baeken, C., 2016. Bilateral low frequency ... In this study we confirmed the importance of the intensity of the treatment with rTMS, which may differ according to the frequency of stimulations. The effect of rTMS develops slowly and its effect is maintained for months. We observed a strong age dependency in the effect of rTMS, which may indicate the need for more frequent treatment with rTMS in patients over 65 yrs than in the younger group of age. The longevity of the effect is not only, explained by the modification of the brain plasticity or the induction of the dopamine release in the striatum by rTMS. Although, the role of the prolonged elevation of BDNF and production of progenitor cells in the brain may be an important mechanism in the effect of rTMS.... Ranieri, F., Tonali, P.A., Rothwell, J.C., 2008. Low-frequency repetitive transcranial magnetic stimulation suppresses specific excitatory circuits in the human motor cortex. J. Physiol. 586, 4481-4487.
    Data Types:
    • Dataset
    • Document
4