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Kim, D.J.,Kim, G.S.,Park, N.W.,Lee, W.Y.,Sim, Y.,Kim, K.S.,Seong, M.J.,Koh, J.H.,Hong, C.H.,Lee, S.K. Elsevier Sequoia 2014 JOURNAL OF ALLOYS AND COMPOUNDS Vol.612 No.-
We have investigated the effect of annealing of graphene sheets on the electrical properties of Au/graphene/n-type silicon Schottky diode. Large scale graphene sheets were grown by chemical vapor deposition and then annealed at 300, 400, and 500<SUP>o</SUP>C; one sheet was left un-annealed as the control. The diodes were fabricated by transferring the graphene sheets directly onto n-type Si substrates and the current-voltage (I-V) and capacitance-voltage (C-V) characteristics were evaluated. The average values of the Schottky barrier height (SBH) and ideality factor (η) for the as-fabricated Au/graphene/n-type silicon Schottky diode from I-V measurements were determined to be ~0.8+/-0.01eV and ~1.79+/-0.05, respectively, whereas the SBH from C-V measurements was ~0.89+/-0.01eV. The electrical transport characteristics measured at room temperature indicated that annealing of graphene sheet prior to the transfer of the graphene onto the n-Si substrates significantly reduces the electric degradation of the Schottky diodes, even though no distinct differences in other electric properties, including ideality factors and SBHs, before or after annealing of the graphene sheets were observed. Thus, by simply annealing the graphene sheets at 500<SUP>o</SUP>C, we found that the Au/graphene/n-type silicon Schottky diode showed an approximately 3.3-fold lower series resistance as compared with the un-annealed Schottky diode under air exposure of up to 7days. These annealed diodes showed significantly reduced electrical degradation by removing the potentially trapped H<SUB>2</SUB>O and/or O<SUB>2</SUB> at the interface between the graphene layer and the n-Si substrate.
Simón Yobanny Reyes López,Juan Serrato Rodríguez 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.1
Besides Raman and infrared spectroscopy, DSC/DTA/TGA, dilatometry, XRD, and SEM techniques were used to characterize phase transitions and microstructural evolution in porcelain stoneware. An experimental porcelain composition has been formed by slip casting and sintered in an electric furnace. Thermal evolution of raw materials shows dehydroxylation of kaolinite, transformation to spinel and mullite, and transformation of α-quartz into β-quartz evidenced by Raman spectroscopy. Spinel and granular (primary) mullite is seen to form in clay relicts which may subsequently become seeds for topotactic grown of acicular reinforcing mullite. As vitrification progresses the bridging silicon oxygen varies and can lead to connectivity changes in the silica network. The development of glassy matrix was followed by infrared spectroscopy at the porcelain intermediate sintering stage. Si-O-Si bands at 780 and 1070 cm−1 for symmetric and asymmetric stretching vibrations in the spectra have been analyzed using a polymerization index (PI). PI indicates the degree of depolymerization of the vitreous matrix through densification. PI was found to correlate well with thermal expansion, bulk density and Young’s modulus. This correlation of glass structure and properties may suggest that changes in the IR spectra could be used to predict physical properties.
Determination of the activation energy for densification of porcelain stoneware
Simón Yobanny Reyes López,Juan Serrato Rodríguez,Satoshi Sugita Sueyoshi 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.3
Experimental porcelain stoneware has been formed by slip casting and sintered by rate controlled dilatometry. Shrinkage has been measured at various constant heating rates up to 1300 oC by dilatometry. A kinetic field for stoneware firing has been set up by connecting points of equal density on the sintering rate curves to determine the activation energy for densification and to calculate optimum firing cycles. The activation energy for densification has been calculated from the slope of the isodensity curves. It has been observed that the activation energy increases with progressive sintering i.e. 470-497 kJ/mol for the intermediate sintering stage (1100-1225 oC) accounting for most of the densification. The abrupt shrinkage and low activation energy values during the intermediate sintering stage suggest a viscous flow mechanism of densification. The final sintering stage responsible for a reduced densification rate showed a lower 313 kJ/mol activation energy.
Simón Yobanny Reyes López,Rosa Saucedo Acuña,Rigoberto López-Juárez,Juan Serrato Rodríguez 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.5
A new simplified route to prepare crystalline α-alumina powders is proposed from the decomposition of aluminum formate Al(O2CH)3 precursor following a process of gelation of Al(O2CH)3 in an aqueous medium. Heat treated powders were characterized by XRD, Raman and infrared spectroscopy showing the presence of η-Al2O3 at 1000 o C and the transformation to α-Al2O3 at 1100 o C, where SEM images of α-Al2O3 reveled an size of 1-2 μm by the aggregated particles, and TEM images confirm a particles size of 200-300 nm. By other hand BET study showed that the specific surface area of η-Al2O3 and the α- Al2O3 obtained is higher than the specific surface area reported for these materials (until 118 m2 /g), ratify that this new route process at low temperature promote to obtain the powers with an excellent superficial area.
Microstructural characterization of sanitaryware, the relationship spinel and mullite
Simón Yobanny Reyes López,Juan Serrato Rodríguez,Satoshi Sugita Sueyoshi 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.4
Sanitaryware reference industrial experimental compositions have been formulated, formed by slip casting and subsequently sintered in a laboratory electric furnace. Microstructural evolution was followed by HRTEM, BSE, X-ray diffraction and infrared spectroscopy. Thermal evolution of raw materials shows dehydroxylation of kaolinite, transformation to spinel and mullite, and transformation of α-quartz into β-quartz. Principal discussions are focused on the spinel and mullite evolution in the 900-1300 ο C temperature range. Evidence of the phase trans formation from spinelto mullite were found in single crystals characterized locally by fast Fourier transformand lattice fringe d spacing accounting for the coexistence of nanometric mullite with the cubic spinel phase. Back scattered electrons (BSE) in topographic mode have been used to show the presence of the spinel type intergrowth plates within the sanitaryware microstructure. Aspect ratio calculations and interplanar analysis of the distances shows less characteristic planes of spinel as mullitization and vitrification progresses, mullite planes increase up to 1250 ο C and decrease at 1300 ο C.
Efficacy of an oral hyaluronate and collagen supplement as a preventive treatment of elbow dysplasia
Simón Martí-Angulo,Núria García-López,Ana Díaz-Ramos 대한수의학회 2014 Journal of Veterinary Science Vol.15 No.4
One hundred and five Labrador dogs were randomlydivided into two groups to determine the number of animalsthat develop elbow dysplasia when treated with an oralsupplement compared to untreated ones. Efficacy of the oraltreatment was also evaluated once illness was diagnosed. The supplement (Hyaloral) contained hyaluronic acid,hydrolysed collagen, glucosamine, chondroitin sulphate,and gamma oryzanol. Clinical evaluation of the elbow jointswas completed at months 3, 6, 12, and 20 by orthopaedicevaluations, radiography, serologic and blood analysis, andveterinarian evaluation of dysplasia symptoms. All sideeffects were recorded. In the control group, 33.3% of thedogs developed radiographic evidence of elbow dysplasiacompared to 18.5% in the treated group. Symptoms ofdysplasia at 12 months differed between the treated (12.5%)and control (61.5%) animals, and were significantlydifferent at 20 months (p < 0.05). Differences in lamenessalong with movement and swelling of the elbows betweengroups were observed after 12 months. The treated grouphad improved significantly by the last visit (p < 0.05). Noadverse side effects were reported. In conclusion, oraltreatment with Hyaloral may have a potential cumulativeaction that provides protection against dysplasia and significantly improves symptoms of elbow dysplasia.
TP53 Polymorphisms allow for genetic sub-grouping of the canine transmissible venereal tumor
Abel Sánchez-Servín,Emilio Córdova-Alarcon,Raúl Fajardo,Simón Martínez 대한수의학회 2009 Journal of Veterinary Science Vol.10 No.4
The canine transmissible venereal tumor (CTVT) is found mainly in dogs’ sexual organs. Currently, it is widely accepted that all samples of CTVT show similar histopathological characteristics and share common genetic alterations. Despite the common genetic origin of CTVT, mutations in the P53 gene have been reported. In this study, we proposed that tumor samples can be genetically grouped using this gene. The presence of different subgroups of CTVT was determined in Mexican dogs using the TP53 gene sequence in CTVT samples. Four new polymorphisms were found and therefore, the CTVT samples were classified in five subgroups.
Cho, J.Y.,Jeong, M.H.,Hwan Park, S.,Kim, I.S.,Park, K.H.,Sim, D.S.,Yoon, N.S.,Yoon, H.J.,Park, H.W.,Hong, Y.J.,Kim, J.H.,Ahn, Y.,Cho, J.G.,Park, J.C.,Kang, J.C. Japanese College of Cardiology 2010 Journal of cardiology Vol.56 No.3
Contrast-induced nephropathy (CIN) has been increasing and seems to be associated with clinical outcomes in ischemic heart disease. This study aimed to assess the incidence, predictors, and cardiac outcomes of CIN when nonionic isosmolar contrast media (iodixanol, Visipaque<SUP>(</SUP>R), GE Healthcare, Cork, Ireland) was used. Between January 2005 and July 2008, 510 patients (69.2+/-9.0 years of age, 384 men) undergoing diagnostic coronary angiography (CAG) or percutaneous coronary intervention (PCI) were divided into two groups according to the development of CIN (CIN group: n=74; non-CIN group: n=436). CIN developed in 74 patients (14.5%). They were more likely to have diabetes (55.4% vs. 42.9%, p=0.045), decreased left ventricular ejection fraction (LVEF) (50.1+/-12.6% vs. 57.7+/-13.9%, p<0.001), and lower baseline hematocrit level (32.4+/-5.3% vs. 36.6+/-5.5%, p<0.001). Multiple logistic regression analysis revealed baseline hematocrit (odds ratio 0.900, 95% confidence interval 0.851-0.952, p<0.001), decreased LVEF (odds ratio 0.967, 95% confidence interval 0.949-0.986, p=0.001), and baseline creatinine level (odds ratio 2.317, 95% confidence interval 1.252-4.286, p=0.007) as independent predictors of CIN. At 1-year follow-up, patients with CIN were found to have more adverse outcomes than without CIN in Cox proportional hazards analysis (hazard ratio 13.068, 95% confidence interval 2.425-70.434, p=0.003). CIN was mostly associated with baseline creatinine level rather than CM amount using nonionic isosmolar CM. We found that patients with CIN had worse event-free survival than patients without CIN after multifactorial adjustment.
Verónica Perea,Xavier Urquizu,Maite Valverde,Marina Macias,Anna Carmona,Esther Esteve,Gemma Escribano,Nuria Pons,Oriol Giménez,Teresa Gironés,Andreu Simó-Servat,Andrea Domenech,Núria Alonso-Carril,Car 대한당뇨병학회 2022 Diabetes and Metabolism Journal Vol.46 No.6
Background: This study aimed to evaluate the influence of maternal diabetes in the risk of neurodevelopmental disorders in offspring in the prenatal and postnatal periods.Methods: This cohort study included singleton gestational diabetes mellitus (GDM) pregnancies >22 weeks’ gestation with live newborns between 1991 and 2008. The control group was randomly selected and matched (1:2) for maternal age, weeks of gestation and birth year. Cox regression models estimated the effect of GDM on the risk of attention-deficit/hyperactivity disorder (ADHD), autism spectrum disorder (ASD), and maternal type 2 diabetes mellitus (T2DM). Moreover, interaction between maternal T2DM and GDM-ADHD relationship was evaluated.Results: Children (<i>n</i>=3,123) were included (1,073 GDM; 2,050 control group). The median follow-up was 18.2 years (interquartile range, 14.2 to 22.3) (<i>n</i>=323 with ADHD, <i>n</i>=36 with ASD, and <i>n</i>=275 from women who developed T2DM). GDM exposure was associated with ADHD (hazard ratio [HR]<sub>crude</sub>, 1.67; 95% confidence interval [CI], 1.33 to 2.07) (HR<sub>adjusted</sub>, 1.64; 95% CI, 1.31 to 2.05). This association remained significant regardless of the treatment (diet or insulin) and diagnosis after 26 weeks of gestation. Children of mothers who developed T2DM presented higher rates of ADHD (14.2 vs. 10%, <i>P</i>=0.029). However, no interaction was found when T2DM was included in the GDM and ADHD models (<i>P</i>>0.05). GDM was not associated with an increased risk of ASD (HR<sub>adjusted</sub>, 1.46; 95% CI, 0.74 to 2.84).Conclusion: Prenatal exposure to GDM increases the risk of ADHD in offspring, regardless of GDM treatment complexity. However, postnatal exposure to maternal T2DM was not related to the development of ADHD.