Structure of Ba2Cu(BO3)2

As part of our program in the synthesis and characterization of new solid-state borates, we recently synthesized the polymorphic compound Sr2Cu(BO3)2 (Smith & Keszler, 1989) which undergoes a first-order phase transition from a low-temperature form to a high-temperature form at 1073 K. The high-temperature beta form exhibits larger coordination numbers for the Sr atoms and a substantial rearrangement of the copper borate network relative to that of the low-temperature... form

An amorphous oxide semiconductor thin-film transistor route to oxide electronics

Amorphous oxide semiconductor (AOS) thin-film transistors (TFTs) invented only one decade ago are now being commercialized for active-matrix liquid crystal display (AMLCD) backplane applications. They also appear to be well positioned for other flat-panel display applications such as active-matrix organic light-emitting diode (AMOLED) applications, electrophoretic displays, and transparent displays. The objectives of this contribution are to overview AOS materials design; assess indium gallium zinc oxide (IGZO) TFTs for AMLCD and AMOLED applications; identify several technical topics meriting future scrutiny before they can be confidently relied upon as providing a solid scientific foundation for underpinning AOS TFT technology; and briefly speculate on the future of AOS TFTs for display and non-display applications

Expresión inmunohistoquímica de p53 en individuos con liquen

Objetivo: Estimar el riesgo del potencial de malignización del liquen plano bucal analizando la expresión de la proteína p53. Materiales y metodos: Se realizó un diseño de cohorte de sujetos con diagnostico histopatológico de liquen. El desenlace fue el desarrollo de cáncer si/no. El total de individuos que cumplió con los criterios de inclusión/exclusión fue de 58. A los 58 sujetos se les realizó la determinación de p53. Resultados: Cuarenta y nueve individuos mostraron una expresión de p53 menor al 5% con una P>0,05% intrasujeto no transformado. En los 9 individuos transformados se observaron diferencias significativas entre la determinación pre y post de la proteína p53. El Riesgo Relativo fue de 188 con una significación estadística de P0.05 among subjects undergoing no transformation. In the 9 subjects undergoing malignant transformation, significant differences were observed between pre and post p53 expression. The relative risk was 188, with a statistical significance of p5% are associated with an increased risk of malignant transformation of this condition. Should our findings be proved in a larger series in the future, the clinical follow-up of these subjects could be modified. This would allow an early diagnosis of any disorder indicative of a potential malignant transformation.Fil: Muiño, A.. Universidad de Buenos Aires. Facultad de Odontología; ArgentinaFil: Adler, I.. Universidad de Buenos Aires. Facultad de Odontología; ArgentinaFil: Lence, A.. Universidad de Buenos Aires. Facultad de Odontología; ArgentinaFil: Harada, L.. Universidad de Buenos Aires. Facultad de Odontología; ArgentinaFil: Nieto, S.. Centro de Educaciones Médicas e Investigación Clínica "Norberto Quirno"; ArgentinaFil: Denninghoff, Valeria Cecilia. Centro de Educaciones Médicas e Investigación Clínica "Norberto Quirno"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Avagnina, A.. Centro de Educaciones Médicas e Investigación Clínica "Norberto Quirno"; ArgentinaFil: Keszler, A.. Universidad de Buenos Aires. Facultad de Odontología; ArgentinaFil: Lanfranchi, H.. Universidad de Buenos Aires. Facultad de Odontología; ArgentinaFil: Aguas, S.. Universidad de Buenos Aires. Facultad de Odontología; Argentin

Method development for measurement of elements in Hungarian red wines by inductivelvy coupled plasma optival emission spectrometry (ICP-OES)

ICP-OES (inductively coupled plasma optical emission spectrometry) was used to determine the element content of red wines. Development of the method involves various procedures of sample handling as well as repeatability and reproducibility measurements. Measurements were made for the following 16 elements: Al, B, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, P, Sr and Zn. The relative standard deviation of repeatability ranged from 0.41% (potassium) to 27% (cadmium) and that of reproducibility varied between 0.73% (boron) to 52% (cobalt). Recovery of the elements was determined by standard addition with results ranging from 90.6% (phosphorus) to 116.2% (boron). After that, 15 red wine samples were measured. Significant differences were found in the Al, B, Ca, Co, Cr, Cu, Fe, K, Mg, Mn, Na, P, Sr and Zn (P<0.001) concentration of wine samples. Correlation studies revealed parallel changes in phosphorus-potassium, phosphorus-magnesium and zinc-manganese concentrations (r=0.857, 0.875, 0.838). According to principal component analysis, measurements of zinc-, sodium-, boron-, copper- and strontium content gave almost the same results as obtained with 16 different elements. According to a two dimensional non-linear map of absolute values of principal component analysis, wines from Szekszárd and Eger could be differentiated, whereas the analysis of wines from Villány, the Mátra Mountains and Lake Balaton showed overlapping results

Solution based prompt inorganic condensation and atomic layer deposition of Al₂O₃ films: A side-by-side comparison

A comparison was made of Al₂O₃ films deposited on Si via prompt inorganic condensation (PIC) and atomic layer deposition (ALD). Current–voltage measurements as a function of annealing temperature indicate that the solution-processed PIC films, annealed at 500°C, exhibit lower leakage and roughly equivalent breakdown strength in comparison to ALD films. PIC films are less dense than as-deposited ALD films and capacitance–voltage measurements indicate a lower relative dielectric constant. On the basis of x-ray photoelectron spectroscopy, transmission electron microscopy, and energy dispersive x-ray spectroscopy, it is found that the 500°C anneal results in the formation of a ~6 nm thick interfacial SiO₂ layer at the Si interface. This SiO₂ interfacial layer significantly affects the electrical performance of PIC Al₂O₃ films deposited on Si.This is the publisher’s final pdf. The published article is copyrighted by the American Vacuum Society and can be found at: http://scitation.aip.org/content/avs/journal/jvsta

p-type conductivity in wide-band-gap BaCuQF (Q=S,Se)

BaCuQF (Q=S,Se) materials, candidate transparent p-type conductors, were prepared by solid-state reaction, and their bulk electrical and optical properties were evaluated. The room-temperature Seebeck coefficient and electrical conductivity of undoped BaCuQF pellets were +56 μV/K and 0.088 S/cm, respectively, for the sulfide fluoride, and +32 μV/K and 0.061 S/cm, respectively, for the selenide fluoride. The conductivity was greatly enhanced by the substitution of several percent of K for Ba; the highest conductivities were 82 S/cm for Ba₀.₉K₀.₁CuSF and 43 S/cm for Ba₀.₉K₀.₁SeF. The band gaps for Q=S and Q=Se were measured to be 3.2 and 3.0 eV, respectively. Undoped BaCuSF exhibits strong red luminescence near 630 nm under ultraviolet excitation.Article appears in Applied Physics Letters (http://apl.aip.org/) and is copyrighted by American Institute of Physics (http://www.aip.org/)

STEM Graduate Students’ Development at the Intersection of Research, Leadership, and Innovation

Researcher innovation and leadership skills are fundamental to create implementable solutions to pressing societal- and market-based global problems. The Research to Innovation to Society (R2I2S) program is a transformative approach to graduate education, training students at the intersection of research, innovation, and leadership. We detail the design of the program, and a three-year exploratory investigation of its impact at one research university in the western United States. We found that, overall, students who participated in the program realized the value of thinking about their scientific research from a market-need perspective. Students perceived enhanced interest in and understanding of societal and market insights related to their own and other’s research. As well, students developed professional skills in communication, team collaboration, innovation, and entrepreneurial skills. We situate our findings in frameworks concerning the development of emerging professionals and argue for programming for STEM graduate students that extends the deep discipline knowledge-based model of professional development into one inclusive of leadership, communication, and innovation goals