137 research outputs found
Effect of the roughening transition on the vicinal surface in the step droplet zone
No full textAbstractFor vicinal surfaces around the (001) surface inclined towards the 〈111〉 direction, the influence of roughening transitions on the surface tension and on step droplets is studied numerically. The surface tension is calculated using a restricted solid-on-solid model with a point-contact type step–step attraction (p-RSOS model) on a square lattice. To ensure the reliability of the calculations, the density matrix renormalization group method is used. The growth rate of the vicinal surface near equilibrium is also calculated by the Monte Carlo method. It is found that the roughening transition changes the morphology around the (001) surface, and the roughening transition affects the size of locally merged steps (step droplets)
Prediction of Protein-Protein Interaction Strength Using Domain Features with Supervised Regression
No full textProteins in living organisms express various important functions by interacting with other proteins and molecules. Therefore, many efforts have been made to investigate and predict protein-protein interactions (PPIs). Analysis of strengths of PPIs is also important because such strengths are involved in functionality of proteins. In this paper, we propose several feature space mappings from protein pairs using protein domain information to predict strengths of PPIs. Moreover, we perform computational experiments employing two machine learning methods, support vector regression (SVR) and relevance vector machine (RVM), for dataset obtained from biological experiments. The prediction results showed that both SVR and RVM with our proposed features outperformed the best existing method
Derivation of an Amplitude Equation for Weakly Nonlinear Pressure Waves of a Very High Frequency in a Compressible Liquid Containing Many Microbubbles
No full textMultiple-scales analysis on high speed and high frequency pressure waves induced by liquid compressibility in bubbly liquids
No full textAssessment of higher insect taxa as bioindicators for different logging-disturbance regimes in lowland tropical rain forest in Sabah, Malaysia
No full textOne of the serious environmental problems since the 1980s has been the conflict between the high rate of deforestation and maintenance of healthy ecosystem services and biological values in tropical forests. There is an urgent demand for setting up an appropriate environmental assessment to keep healthy ecosystem functions and biodiversity along with sustainable forest use based on ecology. In this study, we tried to assess logging-disturbance effects on the abundances of several flying insect groups (higher-taxon approach) in lowland tropical rain forest (Deramakot Forest Reserve, Sabah, Malaysia), while considering seasonal changes and vertical forest stratification. The season was the most important factor affecting the abundances of all the insect groups. Effects of logging disturbance were prominent in the understorey but obscure in the canopy. Changes in physical conditions caused by logging—possibly an increased evaporation due to solar radiation—may have decreased the abundance of desiccation-sensitive insects, especially in the understorey. There are also two probable reasons for the difference between events in the understorey and those in the canopy: (1) noise effects of various physical, environmental factors may have obscured insect responses to logging disturbance in the canopy; (2) higher spatio-temporal variation in quality and quantity of living food resources—such as leaves, flowers and fruits—provided in the canopy may have affected the abundance of their consumer insects independently of logging disturbance. Thus, this study suggests that the abundance of some insect groups at higher-taxon level, especially in the understorey, can be used as bioindicators for assessing effects of logging disturbance on the forest ecosystem
Endoscopic Endonasal Surgery for Suprasellar Rathke's Cleft Cyst Mimicking a Dermoid Cyst
No full textMeasured amplitude modulation of radiated sound from vibrational and aerodynamic sound sources moving at low Mach number
No full textBoth amplitude modulation and frequency modulation occur in a sound field radiated from moving sound sources. However, the amplitude modulation for different source types has not been clarified experimentally. In this study, the directivities of sound radiated from an ultrasonic transducer attached to a moving scaled train model and used as a simplified vibrational sound source were measured. The surface of the vibrational source was parallel to the movement direction of the source. The directivities of an aeolian tone sound generated using a cylinder attached to the train model were also measured; the cylinder was used as an aerodynamic sound source for a simplified dipole component of aerodynamic sound, which is dominant at low Mach numbers, generated from pressure fluctuation. The experimental results show that the acoustic intensity of sound radiated from a vibrational source increases roughly in proportion to the fourth power of the Doppler factor, whereas that of the dipole component of aerodynamic sound increases roughly in proportion to the eighth power of the Doppler factor. Sound radiated from an aerodynamic source moving at low Mach numbers leads to a greater amplitude modulation due to source movement compared with sound radiated from a vibrational source
Structure and analgesic activity relationship of cyclo-tyrosyl-arginyl and its three stereoisomers.
No full textGHz ultrasound propagation with a high speed in compressible liquids containing many microbubbles
No full textInfluence of sound source movement and convection on measured aeolian tone sound at low Mach number
No full textAmplitude modulations of an aerodynamic sound by sound source movement or convection is investigated experimentally. The directivities of an aeolian tone sound radiated from a cylinder fixed in a wind tunnel were measured with horizontally aligned microphones outside the flow as a simplified dipole component of aerodynamic sound generated by pressure fluctuations, which is dominant at low Mach number. The results show that the acoustic intensity of radiated sound can increase approximately in inverse proportion to the fourth power of the ratio of the apparent wavelength of the radiate sound to the original wavelength. The amplitude modulation of the sound by convection was measured and then compared with the modulation of the same sound by source movement. The result revealed that an aerodynamic sound leads to a larger amplitude modulation by source movement compared with the modulation measured in a wind tunnel experiment, although the apparent wavelength of sound radiated from the same source in the atmosphere changes by the same proportion
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