NMR Evidence for Antiferromagnetic Transition in the Single-Component Molecular System, [Cu(tmdt)2_{2}]

The magnetic state of the single-component molecular compound, [Cu(tmdt)$_{2}$], is investigated by means of $^{1}$H-NMR. An abrupt spectral broadening below 13 K and a sharp peak in nuclear spin-lattice relaxation rate, $T_{1}^{-1}$, at 13 K are observed as clear manifestations of a second-order antiferromagnetic transition, which is consistent with the previously reported magnetic susceptibility and EPR measurement. The ordered moment is estimated at $0.22-0.45$ ${\mu}_{\rm B}$/molecule. The temperature-dependence of $T_{1}^{-1}$ above the transition temperature indicates one-dimensional spin dynamics and supports that the spins are on the central part of the molecule differently from other isostructural compounds.Comment: 13pages, 5 figure

Electron Correlations in the Quasi-Two-Dimensional Organic Conductor θ\theta-(BEDT-TTF)2_{2}I3_{3} investigated by 13^{13}C NMR

We report a $^{13}$C-NMR study on the ambient-pressure metallic phase of the layered organic conductor $\theta$-(BEDT-TTF)$_{2}$I$_{3}$ [BEDT-TTF: bisethylenedithio-tetrathiafulvalene], which is expected to connect the physics of correlated electrons and Dirac electrons under pressure. The orientation dependence of the NMR spectra shows that all BEDT-TTF molecules in the unit cell are to be seen equivalent from a microscopic point of view. This feature is consistent with the orthorhombic symmetry of the BEDT-TTF sublattice and also indicates that the monoclinic $I_{3}$ sublattice, which should make three molecules in the unit cell nonequivalent, is not practically influential on the electronic state in the conducting BEDT-TTF layers at ambient pressure. There is no signature of charge disproportionation in opposition to most of the $\theta$-type BEDT-TTF salts. The analyses of NMR Knight shift, $K$, and the nuclear spin-lattice relaxation rate, $1/T_{1}$, revealed that the degree of electron correlation, evaluated by the Korringa ratio [$\varpropto 1/(T_{1}TK^{2}$)], is in an intermediate regime. However, NMR relaxation rate $1/T_{1}$ is enhanced above $\sim$ 200K, which possibly indicates that the system enters into a quantum critical regime of charge-order fluctuations as suggested theoretically.Comment: 19pages, 6figure

Consumer behaviour in E-Commerce : Millennials in the USA, Washington D.C area

The target of this thesis was to understand consumer behaviour in e-commerce. The target area is the Washington DC area USA from amongst young adults between 21-34 years of age classified as millennials. The impact of technology changes and variables influencing the selection process of an e-retailer among the millennials was studied. A research with help of a survey to total 285 participants in four different shopping malls was performed in the Washington D.C. metropolitan area conducted between April 1st and May 31st 2015. The findings of the survey show that both the number of consumers who use the Internet for both assessing a product and retailers that are selling via Internet is growing in the area of this research. Consumers are also purchasing with more frequency on the Internet and as such the importance of the Internet is becoming a crucial aspect to understand consumer behaviour. The items purchased on the Internet range from small purchase items of iPhone cases to large purchase of vessels and work trucks with prices ranging on the thousands of dollars. Trust is imperative on the Internet and along increasing competition it is the all more important to have a strict control of what goes in the Internet and what goes out to the Internet in regards to ones business. On a personal note, I had an experience purchasing a truck replacement part from a farm ways out in Pennsylvania farmland. The seller at the conclusion of the transaction re-marked how without “this Internet” we would have never met or known we existed. I believe that simple remark summarizes all the importance of E-Commerce

DIHS/DRESS患者における血清中HHV6B microRNAの変化

博士（医学）・甲第699号・平成31年3月15日Copyright © 2018. Acta Dermato-Venereologica. All rights reserved.This is an open access article under the CC BY-NC license(http://creativecommons.org/licenses/by-nc/4.0/)