Theory of size-dependent resonance Raman intensities in InP nanocrystals

The resonance Raman spectrum of InP nanocrystals is characterized by features ascribable to both longitudinal (LO) and transverse (TO) optical modes. The intensity ratio of these modes exhibits a strong size dependence. To calculate the size dependence of the LO and TO Raman cross sections, we combine existing models of Raman scattering, the size dependence of electronic and vibrational structure, and electron vibration coupling in solids. For nanocrystals with a radius >10 Å, both the LO and TO coupling strengths increase with increasing radius. This, together with an experimentally observed increase in the electronic dephasing rate with decreasing size, allows us to account for the observed ratio of LO/TO Raman intensities

A NEW APPROACH TO EVALUATE KARATE PUNCH TECHNIQUES

The purpose of this study was to determine reaction time, attacking speed and punch force of the well-trained Karateka in various karate punch situations using a quick feedback approach. Twelve subjects (8 male, 4 female), the ROC National Karate Team for the 1998 Bangkok Asian Games, were asked to perform four punch techniques in this study. The four conditions are stand straight, stand reverse, forward straight and forward reverse punches. The results showed that there were no systematic differences between straight and reverse punches. However, the reaction times in forward punch (550-650 ms) were longer than stand punch (350-450 ms), and the attacking speeds in forward punch (2.7-3.0 m/s) were faster than stand punch (1.9-2.1 m/s). In this study, the punch force was expressed by the impact acceleration of the target. The punch forces of the male subjects (43-54 g) were larger than female subjects (24-39 g) as expected. The results of this test could be used as a quantitative index for coaches to improve the punch techniques of the athletes

CUSHIONING PROPERTIES OF SHOE-SURFACE INTERFACES IN DIFFERENT IMPACT ENERGIES

The purpose of this study was to evaluate the cushioning properties of the various shoesurface interfaces in different impact energies. Five shoe-surface conditions were tested in twelve different impact energies (3.19~6.67 joule). Results showed that higher impact energy increased the peak inertial force in each condition. Larger peak inertial forces were found in C1 (polyurethane only) and C5 (asphalt+shoe2) conditions. In low impact energy, the peak inertial forces were similar in C2 (polyurethane+shoe1), C3 (polyurethane+shoe2) and C4 (Asphalt+shoe1) conditions. The peak forces in C3 or C4 were larger than C2 in high impact energy. It was concluded that people ought to choose at least a well-cushioned shoe or surface when doing low impact energy activities, such as walking or jogging, and must choose both well-cushioned shoe and surface when doing high impact energy activities

COMPARISON OF THE EMG ACTIVITY BETWEEN PASSIVE REPEATED PLYOMETRIC HALF SQUAT AND TRADITIONAL ISOTONIC HAFT SQUAT

The purpose of this study was to investigate neuromuscular characteristics of different method of strength training in lower extremity. Three healthy college males were the subjects in this experiment, the subjects’ mean (±SD) age, height, and weight were 25±4.5 years, 172.33±15 cm, and 67.66±11.5 kg, respectively. All subjects attempt to perform Passive Repeated Plyometric half squat movement and traditional isotonic half squat movement. The results revealed that the IEMG of half squat performance by Passive Repeated Plyometric Training Machine in 60R.P.M. was significantly higher than traditional isotonic half squat performance in same speed. The findings of this study suggested that the Passive Repeated Plyometirc Training of lower extremity can significantly increase muscle strength and power than traditional training method

Quantum Tomographic Cryptography with a Semiconductor Single Photon Source

In this paper we analyze the security of the so-called quantum tomographic cryptography with the source producing entangled photons via an experimental scheme proposed in Phys. Rev. Lett. 92, 37903 (2004). We determine the range of the experimental parameters for which the protocol is secure against the most general incoherent attacks

THE RESPONSE OF WHOLE BODY VIBRATION ON TAI CHI AND WEIGHT-LIFTING ATHLETES

Whole body vibration (WBV) is a new technique which may improve leg muscle strength. Many researchers have studied the effect of whole body vibration recently. But study of effects of vibration stimulus to different activity type athletes, such as Tai Chi (N=12) and Weight-lifting (N=15) athletes is lacking. In this study we examine that question. The subjects were asked to stand in a half-squat posture without additional load on a vibration platform with 7 vibration frequencies (5, 9, 12, 16, 20, 24, 30 Hz) at 4 mm amplitude and maintained for 30 seconds. The effect of WBV would be different on different sport subjects’ perceived exertion. We discovered that the subject’s perception may be related with the acceleration of the subject’s head. Using whole body vibration training to improve muscle power and strength depends on the particular sport’s training emphasis to setup the appropriate training protocol such as amplitude and frequency

Searches for New Milky Way Satellites from the First Two Years of Data of the Subaru/Hyper Suprime-Cam Survey: Discovery of Cetus~III

We present the results from a search for new Milky Way (MW) satellites from the first two years of data from the Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP) $\sim 300$~deg$^2$ and report the discovery of a highly compelling ultra-faint dwarf galaxy candidate in Cetus. This is the second ultra-faint dwarf we have discovered after Virgo~I reported in our previous paper. This satellite, Cetus~III, has been identified as a statistically significant (10.7$\sigma$) spatial overdensity of star-like objects, which are selected from a relevant isochrone filter designed for a metal-poor and old stellar population. This stellar system is located at a heliocentric distance of 251$^{+24}_{-11}$~kpc with a most likely absolute magnitude of $M_V = -2.4 \pm 0.6$~mag estimated from a Monte Carlo analysis. Cetus~III is extended with a half-light radius of $r_h = 90^{+42}_{-17}$~pc, suggesting that this is a faint dwarf satellite in the MW located beyond the detection limit of the Sloan Digital Sky Survey. Further spectroscopic studies are needed to assess the nature of this stellar system. We also revisit and update the parameters for Virgo~I finding $M_V = -0.33^{+0.75}_{-0.87}$~mag and $r_h = 47^{+19}_{-13}$~pc. Using simulations of $\Lambda$-dominated cold dark matter models, we predict that we should find one or two new MW satellites from $\sim 300$~deg$^2$ HSC-SSP data, in rough agreement with the discovery rate so far. The further survey and completion of HSC-SSP over $\sim 1,400$~deg$^2$ will provide robust insights into the missing satellites problem.Comment: 12 pages, 12 figures, accepted for publication in PASJ special issu