Dynamic release of trapped light from an ultrahigh-Q nanocavity via adiabatic frequency tuning

Adiabatic frequency shifting is demonstrated by tuning an ultrahigh-Q photonic crystal nanocavity dynamically. By resolving the output temporally and spectrally, we showed that the frequency of the light in the cavity follows the cavity resonance shift and remains in a single mode throughout the process. This confirmed unambiguously that the frequency shift results from the adiabatic tuning. We have employed this process to achieve the dynamic release of a trapped light from an ultrahigh-Q cavity and thus generate a short pulse. This approach provides a simple way of tuning Q dynamically.Comment: 4 pages, 4 figures, submitted to Phys. Rev. Let

Validation of CFD Codes for the Helicopter Wake in Ground Effect

When a helicopter takes off, lands, or makes hovering or taxiing flights in ground effect, its downwash interferes with the ground. Encounters with such highly turbulent helicopter wakes have been blamed for two fixed-wing aircraft crashes in the United Kingdom. Additional incidents including tents blown away are reported in Japan. Due to these accidents, the Japan Aerospace Exploration Agency (JAXA) and the University of Glasgow (UoG) are investigating the helicopter wake structure in ground effect, especially during taxiing, by means of computational fluid dynamics (CFD). In this study, CFD codes of UoG and JAXA are validated through comparing numerical results of each party and flight experiment data. As a result, it is found that the CFD codes show qualitatively the same results each other and they are also close to the experiment

Experimental and theoretical diagnoses of yearly-scale nitrate ion spikes observed in a Dome Fuji shallow ice core

第3回極域科学シンポジウム　横断セッション「海・陸・氷床から探る後期新生代の南極寒冷圏環境変動」11月27日（火） 国立国語研究所 ２階講

Design and Evaluation of an Individually Simulated Mobility Model in Wireless Ad Hoc Networks,

Abstract Since there has been little focus on systematically creating user mobility and communication pattern traces, researchers in the mobile networking community often propose personal models with which to validate their routing algorithms. This approach has two problems: (1) invalid conclusions may be drawn from overly simplistic or unrealistic models, an

Investigations of a boxed rotor: The STAR II rotor in DLR's test hall

The second Smart Twisting Active Rotor (STAR II) project aims at investigating active twist on a conventional blade design in the DNW-LLF wind tunnel. Prior to the wind tunnel test, the rotor is first tested for correct operation in the rotor test hall at the German Aerospace Center (DLR) in Braunschweig. This test shall ensure that all the instrumentation, but also the active twist, works correctly along with setting up the tracking of the blades before shipping the whole test setup to the DNW-LLF wind tunnel. From previous rotor tests in this hall, it was observed that vibration levels increased drastically above certain thrusts. Since there were no PIV tests carried out within this test chamber, it was decided to carry out CFD simulations to obtain visualizations of the flow and to find the origins of these vibrations. The rotor test hall was approximated by a simple box. With the help of CFD simulations carried out by DLR and JAXA, the initial guess of potential recirculation could be confirmed. The recirculation effect and vibrations become stronger with increasing thrust and therefore limits the maximum thrust in the test hall. This paper details the results of the CFD simulation and presents them along with initial experimental data from the rotor test hall

Increased urine level of amino-terminal peptide derivatives of type III procollagen in patients with liver diseases.

The amino-terminal peptides of type III procollagen (PIIIP) in the urine of 40 patients with various liver diseases were determined with a commercial radioimmunoassay kit. The level of urinary PIIIP (uPIIIP) was correlated well with serum PIIIP (sPIIIP) in 9 patients, the coefficient of correlation being r = 0.836 (p less than 0.01) and the regression line being y = 1.42x + 24. Urinary PIIIP consisted of at least 4 different molecular species with molecular weights of 49 k, 18 k, 10 k and 4.6 k as estimated by column chromatography on Sephadex G-100. Furthermore. uPIIIP was found to be significantly elevated in acute hepatitis, chronic hepatitis, liver cirrhosis, hepatocellular carcinoma and other liver diseases, in which the elevation of sPIIIP has been reported by others. The mean values +/- standard deviations of uPIIIP were 44.0 +/- 32.0, 60.4 +/- 32.0, 62.0 +/- 46.5, 53.0 +/- 27.1 and 48.1 +/- 22.8 ng/ml for the respective liver diseases, and 13.2 +/- 4.5 for the non-hepatic disease group

Non-contact imaging of peripheral hemodynamics during cognitive and psychological stressors

Peripheral hemodynamics, measured via the blood volume pulse and vasomotion, provide a valuable way of monitoring physiological state. Camera imaging-based systems can be used to measure these peripheral signals without contact with the body, at distances of multiple meters. While researchers have paid attention to non-contact imaging photoplethysmography, the study of peripheral hemodynamics and the effect of autonomic nervous system activity on these signals has received less attention. Using a method, based on a tissue-like model of the skin, we extract melanin Cm and hemoglobin CHbO concentrations from videos of the hand and face and show that significant decreases in peripheral pulse signal power (by 36% +/- 29%) and vasomotion signal power (by 50% +/- 26%) occur during periods of cognitive and psychological stress. Via three experiments we show that similar results are achieved across different stimuli and regions of skin (face and hand). While changes in peripheral pulse and vasomotion power were significant the changes in pulse rate variability were less consistent across subjects and tasks