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RISS 인기검색어
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- 저자 : R. Kaneko (검색결과 6 건)
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A Study on Ferro Fluid Dynamic Bearing Spindel Characteristics by High Frequency Vibration Ssystem
M. Miwa,H. Harita,T. Nishigami,R. Kaneko,H. Unozawa 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
Ball bearings (BB) are generally used in spindles of disk drives at present, but they have been known that BB generate high frequency vibration. Fluid dynamic bearings (FDB) having high-rotational accuracy and small vibration characteristics have been developed as next generation spindles. Especially, a ferro fluid bearing (FFB) spindle has the advantage to prevent leakage and dispersion of lubricating oil using a ferro seal. In this study, we measured damping characteristics and frequency characteristics of these bearing spindles using a high-frequency vibration base. High frequency excitation was added to these bearing spindles mounted on the vibration base, and we proved that FFB and FDB spindles have effective damping..
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Funaba, M.,Saita, J.,Nokubo, T.,Kaneko, O.,Kanagawa, Y.,Yano, H.,Kawashima, R. Asian Australasian Association of Animal Productio 1990 Animal Bioscience Vol.3 No.2
The effect of dietary protein-energy restriction (PER) on the growth of long bone were examined in sheep during growing period and then following a cycle of reproduction. Three months-old female sheep were offered protein-energy restricted feed for 6 months (growing period), thereafter changed to normal nutritional conditions for 8 months (reproduction period). A half of animals in each group took pregnancy, parturition and lactation. The nutritional restriction reduced the growth in bone diameter more than that in bone length. Compensatory growth resulting from the removal of the nutritional restraint strongly occurred in bone diameter, especially the bone cortical width, as compared to bone longitudinal growth. A cycle of reproduction severely decreased the growth in the bone cortical width relative to that in the bone width, and little effect was found on the growth in bone length and bone mass. The depression of bone development by pregnancy and lactation tended to exhibit severer in animals having received normal nutrition than in those having received PER. Bone mineral density was not affected by the nutritional restriction. A cycle of reproduction had an adverse effect on the mineral density between in animals having received normal nutrition and in those having received PER.
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간이동결법에 의한 운동성 불량정액과 정자감소증 정액의 정자냉동보존
박찬무,박영하,박영선,박준숙,박준영,Kaneko, S,Iizuka, R 대한산부인과학회 1990 Obstetrics & Gynecology Science Vol.33 No.5
배우자간인공수정(AIH)시의 정자동결과 냉동보존의 응용을 목적으로, 융해시의 정자소생율 향상과 동결법의 간편화를 시도했다. 정자운동율 50%이하의 정액은 Continuous-step density gradient centrifugation method를 이용해 세정 농축한 결과, 정자수와 운동율이 향상되어 정자소생율의 지표가 되는 Fertility Index{FI=정자수(/ml)X운동율(%)X10-8}가 5.6배 향상되었다. 또한, Oligozoospermia중에서도 정자수가 10X106/ml이하인 정액은 Cushion method를 이용해 농축한 결과, 정자수는 4.2 ± 2.1배, 운동율은 2.3 ± 1.9배 증가되었다. 세정과 농축시킨 정자의 간이동결법에 의한 냉동보존에 있어서, 간이동결기내에 액체질소(-196℃)를 넣고 수분간 방치시켜, 액체질소증기에 의해 동결기 내부가 온도평형(-150℃)에 도달되도록 했다. KS-II 보존액을 혼합한 0.5ml의 세정 농축정자를 냉동보존용 serum tube에 넣고, 액체질소 수면위 2cm에서 옆으로 뉘여 동결시킨 후, 액체질소저장용기(Liquid Nitrogen container)에 옮겨 보관했다. 인공 수정시에 30℃의 온수에 융해시킨 결과, 각각 70 ± 12%, 64 ± 11%의 정자소생율을 얻을 수가 있었다. 융해후에도(Continuous-step density gradient centrifugation method의 경우는 원래정자의 평균 2배 이상의 FI가 유지되었다. 이상의 결과에서 운동성 불량정액과 Oligozoospermia의 AIH에 있어서 정자의 세정 및 농축과, KS-II 냉동보존액을 혼합시킨 후 간이동결법을 이용한 냉동보존법으로 원래정액 이상의 정자수와 운동율을 얻을 수 있음이 확인되었다. It is well known that the cryopreservation of human semen plays an important role in the field of clinical Artificial Insemination by Husband semen (AIH) and Donor semen (AID). However, semen dilution with cryopreservation medium and decrease in sperm motility during freeze-thaw processes make lowering semen qualities and survival rate. The author undertook this experiments to pursue the higher survival rate of cryopreserved semen and more simple method of freezing technique. To improve the qualities of cryopreserved semen after thawing, it is effective to concentrate the sperm from whole ejaculate by two method, continuous-step density gradient centrifugation method and Cushion method, as well as to achieve higher survival rate. A : Prior to freezing, the continuous-step density gradient centrifugation method was undertaken for semen with poor motility (below 50 %) sperm. As a result of this, the semen was given 5.8 times improvement of Fertility Index (sperm density (106/ml) X motility (%) X 10-8) B : The concentration of severe oligozoospermic semen by the Cushion method was improved the sperm density 4 times than the original semen. A simple liquid nitrogen vapor freezing was employed in the present study : the concentrated sperm was mixed with KS-II cryopreservation medium and them placed at 2 cm up the surface of liquid nitrogen. After freezed by liquid nitrogen vapor at -150℃, the specimen was stored in liquid nitrogen container. At the time of AIH, thawed with shaker in 30℃ water, the sperm survival rate of A and B were found to be 7-±12 % and 64 ± 11 %, respectively. The post thaw Fertility Index was as twice as that of the original semen by the continuous-step density gradient centrifugation method, and the survival rate was also high. It is consequently suggested that simple liquid nitrogen vapor freezing method using KS-II cryopreservation medium, after sperm washing and concentration, is the very simple and convenient method with good results for cryopreservation of sperm.
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Extending the dynamic range of electronics in a Time Projection Chamber
Estee, J.,Lynch, W.G.,Barney, J.,Cerizza, G.,Jhang, G.,Lee, J.W.,Wang, R.,Isobe, T.,Kaneko, M.,Kurata-Nishimura, M.,Murakami, T.,Shane, R.,Tangwancharoen, S.,Tsang, C.Y.,Tsang, M.B.,Hong, B.,Lasko, P. Elsevier 2019 Nuclear instruments & methods in physics research. Vol.944 No.-
<P><B>Abstract</B></P> <P>When Time Projection Chambers (TPCs) are used in low to intermediate heavy ion collisions, the mass and momentum range of the emitted particles cover a wide range in energy losses. Many TPC readout electronics currently only have a single gain output with a fixed dynamic range. In a recent set of experiments using the SAMURAI Pion-Reconstruction and Ion-Tracker (S π RIT) TPC, it was important to simultaneously measure relativistic pions and heavy ion tracks from the same collisions. As the ionization from a track’s energy loss is collected and multiplied by the anode wires, a distribution of image charges is induced on the TPC read-out pads. If the avalanche on a wire is large enough, the charge collected by pads directly underneath will saturate the readout electronics; pads farther away in the distribution will not be saturated. Using these unsaturated pads and the known pad distribution function, we can estimate the charge on saturated pads, increasing the dynamic range by a factor of 5.</P>
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