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Electronic and superconducting properties of the binary carbide La2C3
김준성,Reinhard K. Kremer,Ove Jepsen,Arndt Simon 한국물리학회 2006 Current Applied Physics Vol.6 No.5
We have studied the electronic structure and investigated the synthesis conditions to optimize the superconducting properties ofthe binary carbide La2C3. From the electronic structure calculation based on two dierent reported crystal structure determinations,the Fermi level (EF) is found to be located near a local minimum of the density of state (DOS) and the DOS atEFvaries with a slightchange of the structural parameters. These results are consistent with the fact that the superconducting properties of La2C3 are sen-sitive to the preparation conditions and the annealing procedure. By a careful control of the C deciency we have improved thesuperconducting properties and prepare samples showing a sharp superconducting transition ofTc = 13.213.3 K. Critical elds,Hc2 (T), estimated from resistivity and susceptibility measurement are considerably higher than reported previously.
Reinhard K. Kremer,Arndt Simon 한국물리학회 2004 Current Applied Physics Vol.4 No.5
We have been exploring routes and systems alternative to the oxocuprates and the oxomanganates and searched for super-conductivity and large magnetoresistance in rare earth compounds, particularly, in the family of layered metallic rare earth halidesand rare earth carbides. Here we review the superconducting properties of YC2,La2C3, and RE2C2X2 (RE¼ Y, La; X¼ Cl, Br, I) aswell as some recent results of the large magnetoresistance eect in the ferromagnet GdI2.
김영욱,김준성,Kim, Young-Wook,Kremer, Reinhard K.,Kim, Jun-Sung 한국초전도학회 2011 Progress in superconductivity Vol.12 No.2
We have investigated the anisotropy of the superconducting properties for $CaC_6$ and $SrC_6$ using upper critical fields ($H_{c2}$) and specific heat ($C_p$). From the upper critical fields of $CaC_6$ at different magnetic field orientations, H//c and H// ab, the anisotropy is found to be ~ 5 at low temperatures, much larger than that of $SrC_6$. These results are in contrast to the stronger anisotropy in the electronic structure for $SrC_6$ than for $CaC_6$ indicating a stronger anisotropy in the superconducting gap in $CaC_6$. The findings are confirmed by the temperature dependence of the superconducting specific heat below $T_c$ for $CaC_6$ and $SrC_6$, suggesting the important role of anisotropic electron-phonon coupling in superconducting intercalated graphites.
Vietnamese Health Care Providers' Preferences Regarding Recommendation of HPV Vaccines
Asiedu, Gladys B,Breitkopf, Carmen Radecki,Kremers, Walter K,Ngo, Quang V,Nguyen, Nguyen V,Barenberg, Benjamin J,Tran, Vinh D,Dinh, Tri A Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.12
Physician recommendation is an important predictor of HPV vaccine acceptance; however, physician willingness and preferences regarding HPV vaccination may be influenced by factors including patient age, vaccine type, and cost. A cross-sectional survey was administered to a convenience sample of health care providers in Da Nang, Vietnam, to evaluate awareness, perceptions about HPV and HPV vaccines, and willingness to vaccinate a female patient. Willingness to vaccinate was evaluated using a full-factorial presentation of scenarios featuring the following factors: vaccine cost (free vs 1,000,000 VND), patient age (12, 16, or 22 years), and HPV vaccine type (bivalent vs quadrivalent). Responses from 244 providers were analyzed; providers had a mean age of $34{\pm}11.9$ years; a majority were female, married, and had children of their own. Thirty-six percent specialized in obstetrics/gynecology and 24% were providers in family medicine. Of the three factors considered in conjoint analysis, vaccine cost was the most important factor in willingness to vaccinate, followed by patient age, and vaccine type. The most favorable scenario for vaccinating a female patient was when the vaccine was free, the patient was 22 years of age, and the HPV4 vaccine was described. In multivariable analysis, older age, being a physician, being married, and having children were all associated with increased willingness to recommend HPV vaccination (p<0.05). Provider willingness is an important aspect of successful HPV vaccination programs; identifying preferences and biases in recommendation patterns will highlight potential areas for education and intervention.