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REVISITING THE MICROLENSING EVENT OGLE 2012-BLG-0026: A SOLAR MASS STAR WITH TWO COLD GIANT PLANETS
Beaulieu, J.-P.,Bennett, D. P.,Batista, V.,Fukui, A.,Marquette, J.-B.,Brillant, S.,Cole, A. A.,Rogers, L. A.,Sumi, T.,Abe, F.,Bhattacharya, A.,Koshimoto, N.,Suzuki, D.,Tristram, P. J.,Han, C.,Gould, A American Astronomical Society 2016 The Astrophysical Journal Vol.824 No.2
<P>Two cold gas giant planets orbiting a G-type main-sequence star in the galactic disk were previously discovered in the high-magnification microlensing event OGLE-2012-BLG-0026. Here, we present revised host star flux measurements and a refined model for the two-planet system using additional light curve data. We performed high angular resolution adaptive optics imaging with the Keck and Subaru telescopes at two epochs while the source star was still amplified. We detected the lens flux, H = 16.39 +/- 0.08. The lens, a disk star, is brighter than predicted from the modeling in the original study. We revisited the light curve modeling using additional photometric data from the B&C telescope in New Zealand and CTIO 1.3 m H-band light curve. We then include the Keck and Subaru adaptive optic observation constraints. The system is composed of a similar to 4-9 Gyr lens star of M-lens = 1.06 +/- 0.05 M circle dot at a distance of D-lens = 4.0 +/- 0.3 kpc, orbited by two giant planets of 0.145 +/- 0.008 M-Jup and 0.86 +/- 0.06 M-Jup, with projected separations of 4.0 +/- 0.5 au and 4.8 +/- 0.7 au, respectively. Because the lens is brighter than the source star by 16 +/- 8% in H, with no other blend within one arcsec, it will be possible to estimate its metallicity using subsequent IR spectroscopy with 8-10 m class telescopes. By adding a constraint on the metallicity it will be possible to refine the age of the system.</P>
Samuel J. van Bohemen,Jeffrey M. Rogers,Philip C. Boughton,Jillian L. Clarke,Joaquin T. Valderrama,Andre Z. Kyme 대한의용생체공학회 2023 Biomedical Engineering Letters (BMEL) Vol.13 No.2
This paper describes a potential method to detect changes in cerebral blood flow (CBF) using electrocardiography (ECG)signals, measured across scalp electrodes with reference to the same signal across the chest—a metric we term the ElectrocardiographyBrain Perfusion index (EBPi). We investigated the feasibility of EBPi to monitor CBF changes in response tospecific tasks. Twenty healthy volunteers wore a head-mounted device to monitor EBPi and electroencephalography (EEG)during tasks known to alter CBF. Transcranial Doppler (TCD) ultrasound measurements provided ground-truth estimatesof CBF. Statistical analyses were applied to EBPi, TCD right middle cerebral artery blood flow velocity (rMCAv) and EEGrelative Alpha (rAlpha) data to detect significant task-induced changes and correlations. Breath-holding and aerobic exerciseinduced highly significant increases in EBPi and TCD rMCAv (p < 0.01). Verbal fluency also increased both measures,however the increase was only significant for EBPi (p < 0.05). Hyperventilation induced a highly significant decrease in TCDrMCAv (p < 0.01) but EBPi was unchanged. Combining all tasks, EBPi exhibited a highly significant, weak positive correlationwith TCD rMCAv (r = 0.27, p < 0.01) and the Pearson coefficient between EBPi and rAlpha was r = − 0.09 (p = 0.05). EBPi appears to be responsive to dynamic changes in CBF and, can enable practical, continuous monitoring. CBF is a keyparameter of brain health and function but is not easily measured in a practical, continuous, non-invasive fashion. EBPi mayhave important clinical implications in this context for stroke monitoring and management. Additional studies are requiredto support this claim.
Stretchable and Foldable Silicon Integrated Circuits
Kim, D.-H.,Ahn, J.-H.,Choi, W. M.,Kim, H.-S.,Kim, T.-H.,Song, J.,Huang, Y. Y.,Liu, Z.,Lu, C.,Rogers, J. A. American Association for the Advancement of Scienc 2008 Science Vol.320 No.5875
<P>We have developed a simple approach to high-performance, stretchable, and foldable integrated circuits. The systems integrate inorganic electronic materials, including aligned arrays of nanoribbons of single crystalline silicon, with ultrathin plastic and elastomeric substrates. The designs combine multilayer neutral mechanical plane layouts and 'wavy' structural configurations in silicon complementary logic gates, ring oscillators, and differential amplifiers. We performed three-dimensional analytical and computational modeling of the mechanics and the electronic behaviors of these integrated circuits. Collectively, the results represent routes to devices, such as personal health monitors and other biomedical devices, that require extreme mechanical deformations during installation/use and electronic properties approaching those of conventional systems built on brittle semiconductor wafers.</P>
Reinforced concrete beams under drop-weight impact loads
Yi Chen,D. Roger J. Owen,Y. T. Feng,Philip J. Thiele,Ian M. May 한국계산역학회 2006 Computers and Concrete, An International Journal Vol.3 No.2
This paper describes the results of an investigation into high mass-low velocity impact behaviour of reinforced concrete beams. Tests have been conducted on fifteen 2.7 m or 1.5 m span beams under drop-weight loads. A high-speed video camera has been used at rates of up to 4,500 frames per second in order to record the crack formation, propagation, particle spallation and scabbing. In some tests the strain in the reinforcement has been recorded using 밆urham?strain gauged bars, a technique developed by Scott and Marchand (2000) in which the strain gauges are embedded in the bars, so that the strains in the reinforcement can be recorded without affecting the bond between the concrete and the reinforcement. The impact force acting on the beams has been measured using a load cell placed within the impactor. A high-speed data logging system has been used to record the impact load, strains, accelerations, etc., so that time histories can be obtained. This research has led to the development of computational techniques based on combined continuum/discontinuum methods (finite/discrete element methods) to permit the simulation of impact loaded reinforced concrete beams. The implementation has been within the software package ELFEN (2004). Beams, similar to those tested, have been analysed using ELFEN a good agreement has been obtained for both the load-time histories and the crack patterns.
Vincent, M.-W.,Richards, P.-J.,Rogers, T.-J. The Korean Society of Automotive Engineers 2002 International journal of automotive technology Vol.3 No.1
There is Increasing world-wide interest in diesel particulate filters (DPF) because of their proven effectiveness in reducing exhaust smoke and particulate emissions. Fine particulates have been linked to human health . DPF use requires a means to secure the bum-out of the accumulated soot, a process called regeneration. If this is not achieved, the engine cannot continue to operate. A number of techniques are available, but most are complex, expensive or have a high electrical demand. The use of fuel additives to catalyse soot bum-out potentially solves the problem of securing regeneration reliably and at low cost. Work on organo-metallic fuel additives has shown that certain metals combine to glove exceptional regeneration performance. Best performance was achieved with a combination of iron and strontium based compounds. Tests were carried out un a bed engine and on road vehicles, which demonstrated effective and reliable regeneration from a tow dose fuel additive, using a single passive DPF. No control valves, flow diverters. heaters or other devices were employed to assist regeneration. Independent particle size measurements showed that there were no harmful side effects from the use of the iron-strontium fuel additive.
M. W. Vincent",P. J. Richards,T. J. Rogers 한국자동차공학회 2002 International journal of automotive technology Vol.3 No.1
There is increasing world-wide interest in diesel particulate filters (DPF) because of their proven effectiveness in reducing exhaust smoke and particulate emissions. Fine particulates have been linked to human health. DPF use requires a means to secure the burn-out of the accumulated soot, a process called regeneration. If this is not achieved, the engine cannot continue to operate. A number of techniques are available, but most are complex. expensive<br/> or have a high electrical demand. The use of fuel additives to catalyse soot bum-out potentially solves the problem of securing regeneration reliably and at low cost. Work on organo-metallic fuel additives has shown that certain metals combine to give exceptional regeneration performance. Best performance was achieved with a combination of iron and strontium based compounds. Tests were carried out on a bed engine and on road vehicles, which demonstrated effective and reliable regeneration from a low dose fuel additive. using a single passive DPF. No control valves, flow diverters, heaters or other devices were employed to assist regeneration. Independent particle size measurements showed that there were no harmful side effects from the use of the iron-strontium fuel additive.<br/>