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Oguri, S.,Choi, J.,Damayanthi, T.,Hattori, M.,Hazumi, M.,Ishitsuka, H.,Karatsu, K.,Mima, S.,Minowa, M.,Nagasaki, T. Springer Science + Business Media 2016 Journal of low temperature physics Vol.184 No.3
<P>Cosmic microwave background (CMB) is an important source of information about the origin of our universe. In particular, odd-parity large angular scale patterns in the CMB polarization, the primordial B-modes, are strong evidence for an inflationary universe, related to the accelerating expansion of the metric. We are developing a unique telescope, GroundBIRD, to take CMB polarization measurements. The telescope combines novel techniques: high-speed rotation scanning, cold optics, and microwave kinetic inductance detectors (MKIDs). We evaluated the response of MKIDs on the rotation stage. Method of shielding from the geo-magnetic field is established. We have also developed a receiver cryostat. We are able to maintain a sufficient cold status for observations on the optical configuration. We plan to start commissioning the system by observing CMB in Japan in 2015-2016. We will then deploy GroundBIRD in the Canary Islands for further scientific observations.</P>
Note: Sub-Kelvin refrigeration with dry-coolers on a rotating system
Oguri, S.,Ishitsuka, H.,Choi, J.,Kawai, M.,Tajima, O. American Institute of Physics 2014 Review of scientific instruments Vol.85 No.8
<P>We developed a cryogenic system on a rotating table that achieves sub-Kelvin conditions. The cryogenic system consists of a helium sorption cooler and a pulse tube cooler in a cryostat mounted on a rotating table. Two rotary-joint connectors for electricity and helium gas circulation enable the coolers to be operated and maintained with ease. We performed cool-down tests under a condition of continuous rotation at 20 rpm. We obtained a temperature of 0.23 K with a holding time of more than 24 h, thus complying with catalog specifications. We monitored the system's performance for four weeks; two weeks with and without rotation. A few-percent difference in conditions was observed between these two states. Most applications can tolerate such a slight difference. The technology developed is useful for various scientific applications requiring sub-Kelvin conditions on rotating platforms.</P>
1/(N − 1) Expansion Approach to Full-counting Statistics for the SU(N) Anderson Model
Akira Oguri,Rui Sakano 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We apply a recently developed 1/(N − 1) expansion to the full-counting statistics for the N-folddegenerate Anderson impurity model in the Kondo regime. This approach is based on the perturbationtheory in the Coulomb interaction U and is different from the conventional large-N theories,such as the usual 1/N expansion and non-crossing approximation. We have confirmed that thecalculations carried out up to order 1/(N −1)2 agree closely with those of the numerical renormalizationgroup at N = 4, where the degeneracy is still not so large. This ensures the applicabilityof our approach for N 4. We present the results of the cumulants of the probability distributionfunction for a nonequilibrium current through a quantum dot in the particle-hole symmetric case.
Association of a polymorphism of BTN2A1 with dyslipidemia in East Asian populations
FUJIMAKI, TETSUO,KATO, KIMIHIKO,OGURI, MITSUTOSHI,YOHIDA, TETSURO,HORIBE, HIDEKI,YOKOI, KIYOSHI,WATANABE, SACHIRO,SATOH, KEI,AOYAGI, YUKITOSHI,TANAKA, MASASHI,YOSHIDA, HIROTO,SHINKAI, SHOJI,NOZAWA, YO Spandidos Publications 2011 Experimental and therapeutic medicine Vol.2 No.4
돼지에 있어서 수정란의 외과적 채란 및 이식에 관한 연구
김희석,소율 기언,소도 민지,상마 정 濟州大學校 農科大學 動物科學硏究所 1993 動物科學論叢 Vol.8 No.1
Embryos collected on day 5 were best in the recovery rate and number of embryos. The number of embryos collected was most in 1 to 2 surgery times but the recovery rate of it was slightly lower. The conception rate and litter size were high when the embryos were transfered on day 4 after estrus and when the number of ovulation was 16 to 20 . While the litter size was more when the donors came into heat 1 day ealier than 2 days ealier and when the embryos were collected on day 6 than when collected on day 5, conception rates were higher when the donors came into heat 2 days ealier than when came into heat 1 day ealier and when the embryos were collected on day 5 than when collected on day 6.
Toshiki Tachi,Kazuo Oguri,Suguru Torii,Kando Kobayashi,Katsunori Fujii,Jun Dong Kim(김준동),Ho Sung Nho(노호성) 한국생명과학회 2011 생명과학회지 Vol.21 No.1
본 연구는 남녀 노인을 대상으로 12주간의 트레이닝을 실시한 후, 대요근과 대퇴부 근육의 근 횡단면적의 변화를 검토하였다. 연구 대상자는 65세에서 80세까지의 노인 58명(남성 30명, 여성 28명)이었으며, 대조군 19명과 운동군 39명으로 나누어 실시하였다. 측정항목은 신장, 체중, 체질량, 대요근과 대퇴부의 근 횡단면적을 측정하였다. 근육의 평가는 자기공명영상법(MRI)을 사용하여 실험 전, 후 실시하였다. 운동군은 대요근과 대퇴부 근육을 증가시키기 위하여 특별히 고안된 기계를 사용하여 평균 주 2일, 12주 동안 23번의 트레이닝을 실시하였다. 대요근의 측정부위는 L4와 L5의 중간부위를 분석하고, 대퇴부는 대퇴골과 무릎까지 길이를 나누어 50%부위에서 분석하였다. 트레이닝 후, 운동군의 대요근 근횡단면적은 9.4% 증가하였다(남성 11.5%, 여성 8.4%). 그러나 대퇴부 근 횡단면적은 남녀 모두 운동 후 증가경향은 나타나지 않았다. 또한 같은 기간 대조군의 근 횡단면적에서도 유의한 변화는 나타나지 않았다. 대요근은 자세 유지와 허리, 골반 및 대퇴부의 연결에 중요한 역할을 담당하기 때문에, 특히 노인의 이동활동에 중요하다고 사료된다. 본 연구에서는 새로이 개발된 트레이닝 기계를 사용하여 단기간 트레이닝 후, 대요근 근 횡단면적의 증가를 확인하였으며, 이것은 노인들의 근력 및 이동능력의 향상 가능성이 시사되었다. The purpose of this study was to investigate whether 12-weeks of movement training would increase the psoas major cross-sectional area (CSA) in senior men and women. Fifty eight men and women aged 65 to 80 years old (69.6±3.7, 30 male, 28 female) were divided into a control (n=19) and exercise group (n=39). Subjects were assessed before and after the training program for stature, body mass, and magnetic resonance imaging of the psoas major and the quadriceps muscle. The experimental group performed exercises using machines designed to improve the movement of the hip at a frequency of twice every week, with a total of 23 trainings in 12-weeks. Magnetic resonance images of both thighs and the abdomen and psoas major were obtained, aimed at 50% of the length of the greater trochanter and the lower edge of the femur and between the fourth (L4) and fifth (L5) lumbars. A 9.4% increase in the psoas major CSA in the training group was observed. In the male and female breakdown, a 11.5% and 8.4% change was observed in males and females, respectively. In the quadriceps, there was no significant statistical improvement in either males or females. Furthermore, in the control group, there was no significant change seen in either the psoas major or the quadriceps. As a result of conducting training that enables upkeep of posture and smooth linkage of the lumbar spine, the pelvis and thighbone, the psoas major CSA of older adults were improved in a short period of time. For this reason, the possibility of improving the psoas CSA, which decreases remarkably with increased age, by improving the linkage of the body trunk is also suggested.