Transport Barrier Analysis of LHD Plasmas in Gomparison with Neoclassical Models

Abstract In the local Electron Cyclotron Heating (ECH) experiments, high electron temperature plasmas have been olrtained in Compact Helical System (CHS), and recently in the Large Helical Device (LHD). The internal transport barrier (ITB) with strong positive radial electric field has been experimentally observed in CHS, which reduces neo-classical ripple transport and anomalous transport losses. The same physics picture; are expected in LHD high temperature plasmas. Several ion temperature profiles are assumed for analyzing LHD experimental data, and it is found that the experimentally obtained electron thermal transpc,rt coefficients seem to roughly agree with neoclassical ripple transport outside the ITB region. Howeler, around ITB region, about ten times higher than the neoclassical coefficients with strong ambipc'lar electric field prediction are obtained. The anomalous transport losses might be dominant and be redtLced by this strong electric field shear around the ITB region

Factor analysis for construct validity of a trunk impairment scale in Parkinson’s disease: a cross-sectional study

ObjectivesTo investigate the construct validity of the Trunk Impairment Scale (TIS), which was developed to assess trunk impairment in patients with stroke, in patients with Parkinson’s disease (PD).DesignThis retrospective, cross-sectional study enrolled consecutive PD inpatients. Correlation analysis was performed to clarify whether the TIS assessment was related to other balance functions, lower extremity muscle strength, or walking ability. Factor analysis was performed to see how the background factors of TIS differ from balance function, lower limb muscle strength, and walking ability.ResultsExamining the data of 471 patients with PD, there were relationships between TIS and the Mini-Balance Evaluation Systems Test (r = 0.67), Barthel Index (r = 0.57), general lower limb extension torque (r = 0.51), two-minute walk test (r = 0.54), Hoehn and Yahr stage (r = −0.61), and Movement Disorder Society Unified Parkinson’s Disease Rating Scale part III total points (r = −0.59). Factor analysis showed that TIS items were divided into three factors (an abdominal muscles and righting reflex component; a perception and verticality component; and a rotational component), differing from other scales that included clinical assessment items.ConclusionThe TIS can be useful for assessing the underlying trunk impairment as a basis for activities of daily living, gait function, and balance ability in patients with PD

Impurity emission characteristics of long pulse discharges in Large Helical Device

Line spectra from intrinsic impurity ions have been monitored during the three kinds of long-pulse discharges (ICH, ECH, NBI). Constant emission from the iron impurity shows no preferential accumulation of iron ion during the long-pulse operations. Stable Doppler ion temperature has been also measured from Fe XX, C V and C III spectra

Recent Results from LHD Experiment with Emphasis on Relation to Theory from Experimentalist’s View

he Large Helical Device (LHD) has been extending an operational regime of net-current free plasmas towardsthe fusion relevant condition with taking advantage of a net current-free heliotron concept and employing a superconducting coil system. Heating capability has exceeded 10 MW and the central ion and electron temperatureshave reached 7 and 10 keV, respectively. The maximum value of β and pulse length have been extended to 3.2% and 150 s, respectively. Many encouraging physical findings have been obtained. Topics from recent experiments, which should be emphasized from the aspect of theoretical approaches, are reviewed. Those are (1) Prominent features in the inward shifted configuration, i.e., mitigation of an ideal interchange mode in the configuration with magnetic hill, and confinement improvement due to suppression of both anomalous and neoclassical transport, (2) Demonstration ofbifurcation of radial electric field and associated formation of an internal transport barrier, and (3) Dynamics of magnetic islands and clarification of the role of separatrix

脈絡膜破裂のある外傷性黄斑円孔への硝子体手術の1例

背景:脈絡膜破裂を伴った外傷性黄斑円孔に対し硝子体手術を行った一例を経験したので報告する.症例と所見:26歳女性,うちあげ花火が直接右眼にあたり鈍的外傷となった.初診時の矯正視力は0.01であり,白内障,前房出血,黄斑円孔,脈絡膜破裂に伴う黄斑下出血と網膜浮腫がみられた.3週間後黄斑円孔は拡大した.6週後の蛍光眼底造影にて黄斑部に及ぶ網膜循環障害を認めた.受傷6週間後にインドシアニングリーンを用いた内境界膜剥離術を行った.黄斑下手術は行わなかった.結果:術後黄斑円孔は閉鎖し,視力は0.5に改善した.重篤な術後合併症は見られなかった.結論:脈絡膜破裂のある外傷性黄斑円孔に対しても硝子体手術は有効であると考えられた.Background: We report a case of traumatic macular hole with choroidal rupture treated with vitrectomy. Case & findings: The patient was a 26-years-old female, who was hit by fireworks in the right eye. At the initial visit, objective symptoms were cataract, hyphema, macular hole, retinal edema, and subretinal hemorrhage following choroidal rupture. Best corrected visual acuity was 0.01 in the right eye. A macular hole developed within 3 weeks, and retinal circulatory disorder was detected in fluorescein angiography. 6 weeks later, pars plana vitrectomy with internal limited membrane peeling using indocyanine green was performed. Sub-retinal procedure in the macular was not included in the surgery. After the surgery, the macular hole was closed, and the best corrected visual acuity in the right eye improved to 0.5. No severe complications were seen postoperatively. Conclusion: Vitreous surgery was effective for traumatic macular hole with choroidal rupture