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Experimental investigation of a linear-chain structure in the nucleus <sup>14</sup>C
Yamaguchi, H.,Kahl, D.,Hayakawa, S.,Sakaguchi, Y.,Abe, K.,Nakao, T.,Suhara, T.,Iwasa, N.,Kim, A.,Kim, D.H.,Cha, S.M.,Kwag, M.S.,Lee, J.H.,Lee, E.J.,Chae, K.Y.,Wakabayashi, Y.,Imai, N.,Kitamura, N.,Lee North-Holland Pub. Co 2017 Physics letters. Section B Vol.766 No.-
It is a well-known fact that a cluster of nucleons can be formed in the interior of an atomic nucleus, and such clusters may occupy molecular-like orbitals, showing characteristics similar to normal molecules consisting of atoms. Chemical molecules having a linear alignment are commonly seen in nature, such as carbon dioxide. A similar linear alignment of the nuclear clusters, referred to as linear-chain cluster state (LCCS), has been studied since the 1950s, however, up to now there is no clear experimental evidence demonstrating the existence of such a state. Recently, it was proposed that an excess of neutrons may offer just such a stabilizing mechanism, revitalizing interest in the nuclear LCCS, specifically with predictions for their emergence in neutron-rich carbon isotopes. Here we present the experimental observation of α-cluster states in the radioactive <SUP>14</SUP>C nucleus. Using the Be10+α resonant scattering method with a radioactive beam, we observed a series of levels which completely agree with theoretically predicted levels having an explicit linear-chain cluster configuration. We regard this as the first strong indication of the linear-chain clustered nucleus.
Study on α-cluster levels in non-4n nuclei using low-energy RI beams
Yamaguchi, H,Kahl, D,Hayakawa, S,Sakaguchi, Y,Abe, K,Nakao, T,Suhara, T,Iwasa, N,Kim, A,Kim, D H,Cha, S M,Kwag, M S,Lee, J H,Lee, E J,Chae, K Y,Wakabayashi, Y,Imai, N,Kitamura, N,Lee, P,Moon, J Y,Lee, IOP Publishing 2017 Journal of physics. Conference series Vol.863 No.-
Effect of Liquid Properties on Atomization Characteristics of Liquid Jet across Sheet-Like Air Flow
( T. Yamaguchi ),( T. Okabe ),( M. Shirota ),( T. Inamura ),( M. Daikoku ),( T. Soma ),( Y. Saito ),( Y. Matsushita ),( H. Aoki ),( J. Fukuno ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
A rotary bell-cup atomizer is widely used in the automotive spray painting. The characteristics of this painting is known as high quality finish, high coating efficiency and relatively homogeneous droplet production. The atomizer causes the ligament breakup by the shaping air blowing from the rear of the bell cup. The shaping air carries the generated droplets to the target. In the industrial painting, many paints of different physical properties are used. However, few studies have focused on the effects of physical properties of paint on the atomization characteristics such as the spray angle and the droplet trajectory. The objective of this study is to experimentally clarify the effect of the physical properties of paint on the atomization characteristics. In the experiment, liquid jet (assuming the ligament of paint) was broken up by sheet-like air flow. The experimental conditions such as the air velocity, the liquid density, viscosity and surface tension were varied. The droplet diameter and velocity were quantitatively measured by Particle Tracking Velocimetry (PTV) using double-pulsed Nd: YAG laser with a diffuser as a back light. The breakup point of the liquid jet was measured by image processing method. The experimental results showed that the decrease of surface tension and viscosity produces the finer droplets that are easily carried by the air flow, which results in the increases in the spray angle. This is because the decrease of restoring force and viscous damping due to the decrease of surface tension and liquid viscosity, respectively, promotes the deformation of liquid column, and increases the occurrence frequency of a bag-shaped breakup. We also revealed that the liquid viscosity and surface tension affect droplet trajectory and the range of spray angle.
An optical flow sensor realized by retinal resistive network
T. Yamaguchi 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This paper describes a new optical flow velocity sensor which is based on a local velocity estimation algorithm and realized by analog circuits including resistive networks. It is proved that velocity can be calculated from five kinds of spatiotemporal differential coefficients. It is also proved that these coefficients can be approximated by finite alternating series derived from Shannon’ sampling theorem and Euler’ transformation. Comparing these series and property of the resistive networks, it is realized that these coefficients can be derived everywhere in the network, which is suitable for velocity distribution sensors. In experiments, a monolithic photo diode array which consists of 16 × 16 cells and three layers of resistive networks are used to develop an analog motion sensor. From simulation of the resistive networks, it is also shown that the implemented system will be extended to measure velocity distribution everywhere on the image sensor.