2,449 research outputs found
OBSERVED AND COMPUTED ON SPECTRA OF TWO CARBON STARS 6700 -- 6712{\AA}
No full textAuthor Institution: Astronomy Department, Indiana UniversityEmergent fluxes predicted by the model atmospheres of Alexander, Collins, Fay and Johnson (1971, 26th Molecular Spectroscopy Symposium) are compared with Coude spectral tracings of 19 Psc and WZ Cas at 0.2{\AA} resolution from 6700{\AA}--- 6712{\AA}. The line opacity is that of the and 5 sequences of the and radicals, as well as the Li 6707.8 resonance line. Results are presented for and ratios of 2, 5 and 20 as well as Li/H ratios of to
The Isothermal Variation Of The Entropy (Δst) May Be Miscalculated From Magnetization Isotherms In Some Cases: Mnas And Gd 5ge2si2 Compounds As Examples
No full textThe determination of the isothermal variation of the entropy (ΔS T) is discussed in the present work. We show that ΔS T has very different profiles and magnitudes when calculated from M vs. H or M vs. T experimental data. For MnAs compound, ΔST obtained from M vs. T data does not present a colossal peak. This result and the agreement between theoretical and experimental non-colossal magnetocaloric effect indicate that the colossal peak may be miscalculated from M vs. H experimental data. For Gd5Ge2Si2 compound, ΔST obtained from M vs. T data does not present the peak observed in ΔST from M vs. H data. © 2011 Elsevier B.V. All rights reserved.509834523456Gama, S., Coelho, A.A., De Campos, A., Carvalho Magnus A, G., Gandra, F.C.G., Von Ranke, P.J., De Oliveira, N.A., (2004) Phys. Rev. Lett., 93, p. 237202De Campos, A., Rocco, D.L., Carvalho Magnus A, G., Caron, L., Coelho, A.A., Gama, S., Da Silva, L.M., De Oliveira, N.A., (2005) Nat. Mater., 5, p. 802Liu, G.J., Sun, J.R., Shen, J., Gao, B., Zhang, H.W., Hu, F.X., Shen, B.G., (2007) Appl. Phys. Lett., 90, p. 032507Pecharsky, V.K., Gschneidner Jr., K.A., (1997) Appl. Phys. Lett., 70 (24), p. 3299Wada, H., Tanabe, Y., (2001) Appl. Phys. Lett., 79 (20), p. 3302Zhang, H.W., Shen, J., Dong, Q.Y., Zhao, T.Y., Li, Y.X., Sun, J.R., Shen, B.G., (2008) J. Magn. Magn. Mater., 320, p. 1879Carvalho Magnus A, G., Von Ranke, P.J., De Oliveira, N.A., Coelho, A.A., Gama, S., Gandra, F.C.G., (2009) Eur. Phys. J. B, 68, p. 67Amaral, J.S., Amaral, V.S., (2009) Appl. Phys. Lett., 94, p. 042506Caron, L., Ou, Z.Q., Nguyen, T.T., Cam Thanh, D.T., Tegus, O., Brück, E., (2009) J. Magn. Magn. Mater., 321, p. 3559Tocado, L., Palacios, E., Burriel, R., (2009) J. Appl. Phys., 105, p. 093918Balli, M., Fruchart, D., Gignoux, D., Zach, R., (2009) Appl. Phys. Lett., 95, p. 072509Das, S., Amaral, J.S., Amaral, V.S., (2010) J. Phys. D: Appl. Phys., 43, p. 152002Cui, W., Liu, W., Zhang, Z., (2010) Appl. Phys. Lett., 96, p. 222509Gigure, A., Foldeaki, M., Gopal, B.R., Chahine, R., Bose, T.K., Frydman, A., Barclay, J.A., (1999) Phys. Rev. Lett., 83 (11), p. 2262Gschneidner Jr., K.A., Pecharsky, V.K., Brück, E., Duijn, H.G.M., Levin, E.M., (2000) Phys. Rev. Lett., 85 (19), p. 4190De Oliveira, N.A., Von Ranke, P.J., (2008) Phys. Rev. B, 77, p. 214439Gama, S., De Campos, A., Coelho, A.A., Alves, C.S., Ren, Y., Garcia, F., Brown, D.E., Von Ranke, P.J., (2009) Adv. Funct. Mater., 19 (6), p. 942Pecharsky, V.K., Gschneidner Jr., K.A., (1999) J. Appl. Phys., 86 (1), p. 565Pecharsky, V.K., Gschneidner Jr., K.A., (1999) J. Appl. Phys., 86 (11), p. 6315Tocado, L., Palacios, E., Burriel, R., (2006) J. Therm. Anal. Calor., 84, p. 213Gschneidner Jr., K.A., Pecharsky, V.K., (2000) Annu. Rev. Mater. Sci., 30, p. 387Carvalho Magnus A, G., Alves, C.S., Colucci, C.C., Bolanho, M.A., Coelho, A.A., Gama, S., Nascimento, F.C., Cardoso, L.P., (2007) J. Alloys Compd., 11, p. 432Carvalho Magnus A, G., Coelho, A.A., Gama, S., Von Ranke, P.J., Alves, C.S., (2008) J. Appl. Phys., 104, p. 063915Von Ranke, P.J., Nóbrega, E.P., De Oliveira, I.G., Gomes, A.M., Sarthour, R.S., (2001) Phys. Rev. B, 63, p. 184406Von Ranke, P.J., Gama, S., Coelho, A.A., De Campos, A., Carvalho Magnus A, G., Gandra, F.C.G., De Oliveira, N.A., (2006) Phys. Rev. B, 73, p. 014415Pecharsky, V.K., Gschneidner Jr., K.A., (1999) J. Appl. Phys., 86, p. 6315Pecharsky, V.K., Gschneidner Jr., K.A., (2005) Magnetism and Structure in Functional Materials, pp. 199-222Casanova, F., Batlle, X., Labarta, A., Marcos, J., Vives, E., Mañosa, L., Planes, A., (2005) Magnetism and Structure in Functional Materials, pp. 223-23
Measurement of the Xi(-)(b) and Omega(-)(b) baryon lifetimes
No full textUsing a data sample of pp collisions corresponding to an integrated luminosity of 3 fb−1, the Ξ−b and Ω−b baryons are reconstructed in the Ξ−b → J/ψΞ− and Ω−b → J/ψΩ− decay modes and their lifetimes measured to be
τ(Ξ−b) = 1.55+0.10−0.09 (stat) ± 0.03 (syst) ps,
τ(Ω−b) = 1.54+0.26−0.21 (stat) ± 0.05 (syst) ps.
These are the most precise determinations to date. Both measurements are in good agreement with previous experimental results and with theoretical predictions
LASER INDUCED CHEMILUMINESCENCE STUDY OF TRANSITION: FORMATION, RADIATION AND QUENCHING PROCESSES
No full textThis work was supported by ARPA under contract number DASG6O-77-C-0058 and DASG60-77-C-0028. R. O. Hunter, JR. has been a Fannie and John Hertz Foundation Fellow, University of California at Irvine.""Author Institution: Maxwell Laboratories Incorporated; Molecular Physics LaboratoryThe formation, radiation, and quenching of have been investigated using a laser-induced chemiluminescence technique, Hg//Ar mixtures were irradiated near 2537 {\AA} by a frequency-doubled nitrogen-pumped pulled dye laser. The produced reacted with to yield . The time behavior of the chemiluminescence was analyzed to obtain the following preliminary results:[FIGURE
Phylogenetic lineages in the Botryosphaeriaceae
No full textBotryosphaeria is a species-rich genus with a cosmopolitan distribution, commonly associated with dieback and cankers of woody plants. As many as 18 anamorph genera have been associated with Botryosphaeria, most of which have been reduced to synonymy under Diplodia (conidia mostly ovoid, pigmented, thick-walled), or Fusicoccum (conidia mostly fusoid, hyaline, thin-walled). However, there are numerous conidial anamorphs having morphological characteristics intermediate between Diplodia and Fusicoccum, and there are several records of species outside the Botryosphaeriaceae that have anamorphs apparently typical of Botryosphaeria s.str. Recent studies have also linked Botryosphaeria to species with pigmented, septate ascospores, and Dothiorella anamorphs, or Fusicoccum anamorphs with Dichomera synanamorphs. The aim of this study was to employ DNA sequence data of the 28S rDNA to resolve apparent lineages within the Botryosphaeriaceae. From these data, 12 clades are recognised. Two of these lineages clustered outside the Botryosphaeriaceae, namely Diplodia-like anamorphs occurring on maize, which are best accommodated in Stenocarpella (Diaporthales), as well as an unresolved clade including species of Camarosporium/Microdiplodia. We recognise 10 lineages within the Botryosphaeriaceae, including an unresolved clade (Diplodia/Lasiodiplodia/ Tiarosporella), Botryosphaeria s.str. (Fusicoccum anamorphs), Macrophomina, Neoscytalidium gen. nov., Dothidotthia (Dothiorella anamorphs), Neofusicoccum gen. nov. (Botryosphaeria-like teleomorphs, Diapjomera-like synanamorphs), Pseudofusicoccum gen. nov., Saccharata (Fusicoccum- and Diplodia-like synanamorphs), "Botryosphaeria" quercuum (Diplodia-like anamorph), and Guignardia (Phyllosticta anamorphs). Separate teleomorph and anamorph names are not provided for newly introduced genera, even where both morphs are known. The taxonomy of some clades and isolates (e.g. B. mamane) remains unresolved due to the absence of ex-type cultures
Shape Persistence in Elicited Subjective Crop Yield Probability Density Functions
No full textThe shape persistence of a crop yield probability density function (PDF) was studied by using two variants of the Visual Impact Method (VIM) to elicit subjective estimations by farmers. In one variant ten weights were used to describe the PDF and in the other variant the farmer chose the number of weights. Results were compared directly and by means of Weibull distributions fitting, with evidence being obtained in favor of methodological persistence and the equivalence of the two estimation methods.Subjective crop yield PDF elicitation, Visual impact method, Methodological persistence, Crop Production/Industries,
QUANTUM MECHANICAL CALCULATIONS ON SOME OXIDES OF LITHIUM.
No full text R. C. Spiker, Jr. and L. Andrews, J. Chem. Phys. 58, 702 (1973); D. A. Hatzenbuhler and L. Andrews, J. Chem. Phys. 56, 3398 (1972); K. S. Seshadri, D. White, and D. E. Mann, J. Chem. Phys. 45, 4697 (1966); D. White, K. S. Seshadri, D. F. Dever, D. E. Mann, and M, J. Linevsky, J. Chem. Phys. 39, 2463 (1963). E. L. Wagner, Teoret. Chim. Acta 32, 295 (1974); A. C. Wahl quoted in S, M, Freund, E, Herbst, R. P. Mariella, Jr., and W. Klemperer, J. Chem. Phys. 56, 1467 (1972).Author Institution: Department of Chemistry, The Ohio State UniversityAb initio self-consistent-field calculations using a large basis set have been carried out on the species and . The equilibrium geometries have been determined as well as vibrational frequencies For example, the species LiOLi was found to have a bond length of 1.62 {\AA} and have frequencies of , and . LiLiO was found to have a Li-Li bond length of 3.29 {\AA} and a Li-O bond length of 1.73 {\AA}. LiLiO was also found to have a dipole moment of 11.4 D, and to have several very low lying electronic states. The bond length in LiO was found to be 1.71 {\AA} and ice vibrational frequency was calculated to be . The results are compared to matrix infrared and other $calculations.^{2}
LASER LIGHT INTERACTION FOR TEXTURE EVALUATION OF NATIVE WOODS AND Eucalyptus grandis W. Hill ex Maiden
No full textEste trabalho teve como objetivo estudar padr\uf5es do "speckle" em
fun\ue7\ue3o da textura das madeiras Bowdichia virgilioides
(sucupira), Swietenia macrophylla (mogno) e Balfourodendron
riedeliaum (pau-marfim) e de Eucalyptus grandis. A an\ue1lise do
fen\uf4meno \uf3tico denominado "speckle", aliada a t\ue9cnicas
de tratamento digital de imagens foi utilizada para avalia\ue7\ue3o
de rugosidade e teve como par\ue2metro de compara\ue7\ue3o o
m\ue9todo microsc\uf3pico tradicional. Foi utilizada uma fonte de
luz laser de He-Ne 10mW para iluminar as amostras de madeira para
produ\ue7\ue3o do "speckle e o resultado da intera\ue7\ue3o da
luz laser com a madeira foi capturado por uma c\ue2mera digital tipo
CCD. As imagens capturadas cont\ueam informa\uf5es de
varia\ue7\ue3o espacial de intensidade luminosa de cada pixel do
"speckle", e variando entre 0 e 255 em tons de cinza. Uma \ue1rea
central de 16 x 16 pixels dessa imagem foi selecionada e analisada pela
aplica\ue7\ue3o da fun\ue7\ue3o de convolu\ue7\ue3o e da
Transformada de Fourier, resultando na densidade espectral da
varia\ue7\ue3o espacial de intensidades da imagem. Os resultados
mostraram que as informa\ue7\uf5es obtidas pela densidade espectral
permitiram classificar amostras de madeiras com rugosidades diferentes.This work had the objective of study in patterns of the "speckle" as
function of the wood texture of Bowdichia virgilioides (sucupira),
Swietenia macrophylla (mogno), Balfourodendron riedelianum
(paumarfim) and Eucalyptus grandis wood. The He-Ne laser 10 mW was used
to illuminate the wood samples and a digital camera captured the result
of the interaction of the wood with the laser light. The results
obtained from image analysis were compared with the pattern obtained by
microscopic methodology. The captured images show the intensities of
each pixel, varying between 0 and 255 in the gray scale. From the
images, a central area of 16x16 pixels was removed and analyzed by the
application of the convolution function and its Fourier Transform,
resulting in the power density spectrum. The results showed that the
information obtained by the power density spectrum of the "speckle"
space variation allow classing samples of woods with different texture
THE MICROWAVE SPECTRUM OF .
No full textAuthor Institution: National Bureau of StandardsTransitions in the ground vibrational state for , and , have been assigned and a structure determined. The parameters are: {\AA}, {\AA}, {\AA}, and . For , transitions have also been observed for the low frequency vibrational states. These transitions follow a normal symmetric rotor pattern for , and , however, a strong perturbation occurs between the two lowest vibrations. This gives rise to an unusual pattern. The barrier to internal rotation has been tentatively estimated to be 3 Kcal/mole
PRECISION CONSTANTS OF THE CYANOGEN RED SYSTEM WITH A PERTURBATION ANALYSIS
No full text\footnote{This work was supported by N.A.S.A. Grant NGR-39 005-066.}Author Institution: Astronomy Department,, Indiana UniversityA test has been used to obtain improved molecular constants for the A system of the molecule. It is found that these constants predict wavenumbers that agree with the observed values to within 0.1 \AA for the rotational lines of the lowere vibrational bands up to N^{\prime}^{\prime}=80 and for the higher bands up to N^{\prime}^{\prime} = 50. The rotational lines of the (2,0) and (3,1) vibration-bands of the radical have also been computed with these spectroscopic constants and the wavenujbers agree within 0.1 \AA, if the electronic isotope shift between the and molecules is 0.2 \AA In the present calculation the effect of degenerate perturbations between the and states is included
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