92 research outputs found

    A Note on Stable States of Dipolar Systems at Low Temperatures

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    In the past several years, many important innovations in nanotechnology were made. Today it becomes possible to make nanosize magnetic particles, and development of high storage-density magnetic device is desired. In such a magnetic particle system, dipole interaction plays the main role. In this note, we consider stable states of dipolar systems at low temperature: Some systems show ``antiferromagnetic structure'', and others show magnetic domain structure, depending on lattice shapes.Comment: 5 pages including 5 eps figures, to appear in "Computer Simulation Studies in Condensed Matter Physics XVIII", Eds. D. P. Landau, S. P. Lewis, and H.-B. Sch\"{u}ttler (Springer Verlag, Heidelberg, Berlin

    Clinical impact of lipid injectable emulsion in internal medicine inpatients exclusively receiving parenteral nutrition: a propensity score matching analysis from a Japanese medical claims database

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    Background Although guidelines recommend lipid injectable emulsions (ILEs) be used as a part of parenteral nutrition, many patients in Japan receive lipid-free parenteral nutrition. Furthermore, little is known about the effect of ILEs on clinical outcomes in medical inpatients managed with parenteral nutrition. The aim of this study was to investigate the clinical impact of ILEs on internal medicine inpatients receiving parenteral nutrition. Methods A propensity score matching (PSM) analysis was performed using a medical claims database covering 451 hospitals in Japan. Participants included the following internal medicine inpatients, ages >= 18 years, fasting > 10 days, and receiving exclusively parenteral nutrition, between 2011 and 2020. Participants were divided into 2 groups: those who did and did not receive ILEs. The primary endpoint was in-hospital mortality. The secondary endpoints included intravenous catheter infection, activities of daily living (ADL), hospital length of stay (LOS), and total medical costs. To adjust for energy doses, logistic or multiple regression analyses were performed using energy dose as an additional explanatory variable. Results After PSM, 19,602 matched pairs were formed out of 61,437 patients. The ILE group had significantly lower incidences than the non-ILE group of in-hospital mortality (20.3% vs. 26.9%; odds ratio [OR], 0.69; 95% confidence interval [CI], 0.66-0.72; p < 0.001), deteriorated ADL (10.8% vs. 12.5%; OR, 0.85; 95% CI, 0.79-0.92; p < 0.001), and shorter LOS (regression coefficient, - 0.8; 95% CI, - 1.6-0.0; p = 0.045). After adjusting for energy dose, these ORs or regression coefficients demonstrated the same tendencies and statistical significance. The mean total medical costs were 21,009intheILEgroupand21,009 in the ILE group and 21,402 in the non-ILE group (p = 0.08), and the adjusted regression coefficient for the ILE vs. the non-ILE group was - 860(95860 (95% CI, - 1252 to - $47). Conclusions ILE use was associated with improved clinical outcomes, including lower in-hospital mortality, in internal medicine inpatients receiving parenteral nutrition

    Low Temperature Properties of Antiferromagnets on the Kagome Lattice

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    Thermodynamic properties of antiferromagnets on the kagome lattice at low temperatures are studied for classical Heisenberg spin systems. In pure Heisenberg model, a coplanar structure is chosen by the entropy effect but it has been turned out to be disorder. Namely, it is not the √-structure in spite of the previous conjectures. The properties are also compared with those of quantum spin systems

    Dose-Dependent Effects of Amino Acids on Clinical Outcomes in Adult Medical Inpatients Receiving Only Parenteral Nutrition: A Retrospective Cohort Study Using a Japanese Medical Claims Database

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    The majority of inpatients requiring parenteral nutrition (PN) do not receive adequate amino acid, which may negatively impact clinical outcomes. We investigated the influence of amino acid doses on clinical outcomes in medical adult inpatients fasting >10 days and receiving only PN, using Japanese medical claims database. The primary endpoint was in-hospital mortality, and the secondary endpoints included deterioration of activities of daily living (ADL), intravenous catheter infection, hospital readmission, hospital length of stay (LOS), and total medical costs. Patients were divided into four groups according to their mean prescribed daily amino acid doses from Days 4 to 10 of fasting: Adequate (>= 0.8 g/kg/day), Moderate (>= 0.6-= 0.4-<0.6 g/kg/day), and Very low (<0.4 g/kg/day). Multivariate logistic or multiple regression analyses were performed with adjustments for patient characteristics (total n = 86,702). The Adequate group was used as the reference in all analyses. For the Moderate, Low, and Very low groups, adjusted ORs (95% CI) of in-hospital mortality were 1.20 (1.14-1.26), 1.43 (1.36-1.51), and 1.72 (1.62-1.82), respectively, and for deterioration of ADL were 1.21 (1.11-1.32), 1.34 (1.22-1.47), and 1.22 (1.09-1.37), respectively. Adjusted regression coefficients (95% CI) of hospital LOS were 1.2 (0.4-2.1), 1.5 (0.6-2.4), and 2.9 (1.8-4.1), respectively. Lower prescribed doses of amino acids were associated with worse clinical outcomes including higher in-hospital mortality

    Higher-order structure and Statistical Properties of Dipolar Nano-Particles

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    この論文は国立情報学研究所の電子図書館事業により電子化されました。研究会報告ダイポール相互作用は,異方性の持つr^の長距離相互作用であるため自己組織化により特殊な相構造をとる.今回,前回発表したOCTAシステムを用いた計算により確認された多様な多階層相構造と熱力学的な性質との比較を行った.計算に用いた系は,ダイポール相互作用とVan der Waals球を含む粒子系であるが,比熱にダブルピークを持つ.Van der Waals球に引力項がある場合,このピークは比較的高温で出現するが,斥力項のみの場合ではより低温に出現し生成構造も異なる

    Finite dipolar hexagonal columns on piled layers of triangular lattice

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    We have investigated, by the Monte Carlo simulation, spin systems which represent moments of arrayed magnetic nanoparticles interacting with each other only by the dipole-dipole interaction. In the present paper we aim the understanding of finite size effects on the magnetic nanoparticles arrayed in hexagonal columns cut out from the close-packing structures or from those with uniaxial compression. In columns with the genuine close-packing structures, we observe a single vortex state which is also observed previously in finite 2-dimensional systems. On the other hand in the system with the inter-layer distance set 1/21/\sqrt{2} times of the close-packing one, we found ground states which depend on the number of layers. The dependence is induced by a finite size effect and is related to a orientation transition in the corresponding bulk system.Comment: 3 pages, 2 figures. Proceedings of the International Conference on Magnetism 2006 (ICM2006) conference. To appear in a special volume of Journal of Magnetism and Magnetic Material
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