4,385 research outputs found
Observation of hc radiative decay hc › ??' and evidence for hc › ??
No full textKolcu, Onur Buğra (Arel Author) --- Makale 69 yazarlıdır.A search for radiative decays of the P-wave spin singlet charmonium resonance hc is performed based on 4.48 × 108 ? events collected with the BESIII detector operating at the BEPCII storage ring. Events of the reaction channels hc › ??' and ?? are observed with a statistical significance of 8.4? and 4.0?, respectively, for the first time. The branching fractions of hc › ??' and hc › ?? are measured to be B(hc › ??' ) = (1.52±0.27±0.29)×10-3 and B(hc › ??) = (4.7±1.5±1.4)×10-4 , respectively, where the first errors are statistical and the second are systematic uncertainties
Complete redox exchange of indium for Tl+ in zeolite A. Synthesis and crystal structure of fully indium-exchanged zeolite A
No full textIndium has replaced all of the TIC ions in fully dehydrated fully Tl+-exchanged zeolite A by a solvent-free redox ion-exchange reaction with In metal at 623 K. The crystal structures of the zeolite before (Tl-12-A) and after the reaction, followed by washing with water and redehydration at 350 degrees C for 2 days (In-10-A . In), have been determined by single-crystal X-ray crystallography at 21 degrees C. In-10-A . In, eleven In atoms or ions per unit cell are distributed over seven crystallographically distinct positions. Seven In occupy three threefold-axis equipoints: four In+ ions lie opposite B-rings in large cavity, and two In2+ and one In+ lie opposite B-rings in the sodalite unit. Three In+ ions per unit cell are found at two different 8-ring positions, 1.5 on the 8-ring plane and 1.5 off. Finally, one In-0 atom per unit cell is found at two quite unusual positions: half an In-0 at the center of sodalite unit and the other half In-0 opposite a 4-ring relatively deep in the large cavity. These In atoms associate with In ions, likely forming (In-5)(8+) clusters in half of the sodalite units and (In-3)(2+) clusters in half of the large cavities.X11sci
Complete redox exchange of indium for Tl+ in zeolite A. Crystal structures of anhydrous Tl-12-A and In-10-A center dot In. Indium appears as In2+, In+, and In-0. The clusters(In-5)(8+) and (In-3)(2+) are proposed
No full textIndium has replaced all of the Tl+ ions in fully dehydrated fully Tl+(-)exchanged zeolite A by a solvent-free redox ion-exchange reaction with In metal at 623 K. The crystal structures of the zeolite before (Tl12Si12-Al12O48: a = 12.153(4) Angstrom, R-1 = 0.054, and R-2 = 0.060) and after the reaction, followed by washing with water and redehydration at 623 K (In10Si12Al12O48. In: a = 12.098(2) Angstrom, R-1 = 0.063, and R-2 = 0.062), have been determined by single-crystal X-ray crystallography at 294 K using the space group Pm3m. In In-10-A . In, 11 In atoms or ions/unit cell are distributed over seven crystallographically distinct positions. Seven In ions occupy 3-fold-axis equipoints: four In+ ions lie opposite 6-rings in large cavity (In(1)), and two In2+ (In(2)) and one In+ (In(3)) lie opposite 6-rings in the sodalite unit. Three In+ ions per unit cell are found at two different 8-ring positions: 1.5 on the 8-ring plane (In(4)) and 1.5 off(ln(5)). Finally, one In-0 atom per unit cell, probably associated with In ions, is found at two quite unusual positions: one-half of an In-0 lies at the center of sodalite unit (In(6)) and the other half of the In-0 is opposite a 4-ring relatively deep in the large cavity (In(7)). The crystal structure of In-10-A . In is viewed as a mixture of two kinds of ''unit cells,'' In-8-A . In and In-12-A . In, each with a cationic charge of 12+. By their approach distances to framework oxygens, the ionic radii of In+ and In2+ are ca. 1.23 and 1.04 Angstrom, respectively. The In(6) and In(7) positions lie deep within cavities where they approach only In cations. This suggests the existence of tetrahedral (In-5)(8+) clusters (four In2+ ions at In(2) with an In-0 atom at their center at In(6), In(2)-In(6) distance = 2.754(2) Angstrom in half of the sodalite units (In-8-A . In), and bent (In-3)(2+) clusters In(1)-In(7)-In(1) angle = 148.0(9)(0) and In(1)-In(7) = 3.073(8) Angstrom) in half of the large cavities (In-12-A . In).X1126sciescopu
Crystal structure of indium-exchanged zeolite a containing sorbed disulfur
No full textMolecules of S-2 are sorbed by dehydrated fully indium exchanged zeolite A from S(g) at 623 K. The crystal structure of dehydrated In8Si12Al12O48.(In)(0.75)(S-2) (R-1 = 0.053, R-2 = 0.050, and a = 12.090(2) Angstrom) has been studied by single-crystal X-ray diffraction methods at 294 K using the space group . The complex structural results are interpreted as follows. Each unit cell contains eight indium cations, 0.75 indium atoms, and two sulfur atoms. Six In ions per unit cell are found at four nonequivalent 3-fold axis equipoints: two In+ ions and 0.5 In3+ ions lie opposite six-rings in the large cavity, and three In2+ ions and 0.5 In+ ions Lie opposite six-rings in the sodalite unit. Two In+ ions per unit cell are found at eight-ring positions, off the plane. Three-quarters of an indium per unit cell, as near-neutral atoms associated with In2+ cations, are found at the centers of the sodalite units. The distances of In+, In2+, and In3+ to the nearest framework oxygens are ca. 2.55, 2.37, and 2.26 Angstrom, respectively. The structure may be viewed as having two kinds of "unit cells." Unit cell 1 (In-8-A .(In)(S-2), 75%) contains the (In-5)(8+) cluster (four In2+ ions tetrahedrally arranged about an In-0 in the sodalite unit (In2+-O = 2.37(1) Angstrom and In-0-In2+ = 2.75(2) Angstrom)). Unit cell 2 (In-8-A .(S-2), 25%) has two In3+ ions. In each large cavity, one atom of a disulfur molecule (S-S = 2.13(13) Angstrom) associates with three framework oxygens at 3.11(11) Angstrom, and the other sulfur atom bridges between two In+ ions at 3.26(3) and 3.37(19) Angstrom.X1122sciescopu
Financial analysis and evaluation of company HC Betons Ltd
No full textDiplomdarba nosaukums: Uzņēmuma SIA HC Betons finanšu analīze un novērtējums
Diplomdarba mērķis ir uz finanšu analīzes pamata izvērtēt uzņēmuma SIA HC Betons esošo finansiālo situāciju un izstrādāt priekšlikumus finansiālā stāvokļa uzlabošanai.
Teorētiskajā daļā apskatīti finanšu analīzes teorētiskie aspekti. Praktiskajā daļā autore veica uzņēmuma SIA HC Betons finanšu analīzi par 2009., 2010., un 2011.gadu. Analītiskajā daļā autore salīdzina rādītājus ar konkurējošo uzņēmumu SIA Cemex.
Autore secinājusi, ka uzņēmumam ir finansiālas grūtības, bet pēc autores domām, uzņēmums tuvāko gadu laikā nebankrotēs.
Diplomdarba apjoms ir 78 lapaspuses, tas sastāv no 3 daļām, 12 tabulām, 5 attēliem un 12 pielikumiem.
Atslēgvārdi: analīze, likviditāte, bankrots, koeficienti.Diploma thesis: Financial Analysis and Evaluation of Company HC Betons Ltd.
The aim of the diploma paper is to evaluate company’s HC Betons Ltd current financial situation based on financial analysis and make suggestions for improvement of the financial position.
Theoretical aspects of financial analysis are discussed in the theoretical part of the paper. In the practical part author has performed company’s HC Betons Ltd financial analysis of the years 2009, 2010 and 2011. In the analytical part author compares ratios of a competing company Cemex Ltd.
The author concludes that the company is in financial difficulties, but according to the author’s thoughts, the company will not bankrupt in the coming years.
The volume of the diploma paper is 78 pages; it consists of 3 parts, 12 tables, 5 images and 12 appendices.
Keywords: analysis, liquidity, bankruptcy, ratios
Metabolic profiling and population screening of analgesic usage in nuclear magnetic resonance spectroscopy-based large-scale epidemiologic studies
No full textThe application of a 1H nuclear magnetic resonance (NMR) spectroscopy-based screening method for determining the use of two widely available analgesics (acetaminophen and ibuprofen) in epidemiologic studies has been investigated. We used samples and data from the cross-sectional INTERMAP Study involving participants from Japan (n = 1145), China (n = 839), U.K. (n = 501), and the U.S. (n = 2195). An orthogonal projection to latent structures discriminant analysis (OPLS-DA) algorithm with an incorporated Monte Carlo resampling function was applied to the NMR data set to determine which spectra contained analgesic metabolites. OPLS-DA preprocessing parameters (normalization, bin width, scaling, and input parameters) were assessed systematically to identify an optimal acetaminophen prediction model. Subsets of INTERMAP spectra were examined to verify and validate the presence/absence of acetaminophen/ibuprofen based on known chemical shift and coupling patterns. The optimized and validated acetaminophen model correctly predicted 98.2%, and the ibuprofen model correctly predicted 99.0% of the urine specimens containing these drug metabolites. The acetaminophen and ibuprofen models were subsequently used to predict the presence/absence of these drug metabolites for the remaining INTERMAP specimens. The acetaminophen model identified 415 out of 8436 spectra as containing acetaminophen metabolite signals while the ibuprofen model identified 245 out of 8604 spectra as containing ibuprofen metabolite signals from the global data set after excluding samples used to construct the prediction models. The NMR-based metabolic screening strategy provides a new objective approach for evaluation of self-reported medication data and is extendable to other aspects of population xenometabolome profiling
Specific and fitness testing of goalies HC Motor Czech Budejovice\\
No full textThe aim of this bachelor thesis is to test specific and fitness abilities of goalkeepers of HC Motor Czech Budejovice. In the theoretical part of this thesis, based on content analysis of literature research, the author presents motoric abilities, development patterns and overview of most frequently used tests. In the practical part of thesis, the author deals with creating and verifying tested battery. It was designed using the knowledge gained from books reference and self- experience of a player and a coach as well. To obtain the results of performance of particular motoric abilities the author used testing method. The outcomes were subsequently compared with the evaluation of given motoric abilities on ice. The author acquired the evaluation from goalkeeper's coaches of HC Motor Czech Budejovice. Final results are described and thereafter tabularly presented
Root multiplicities of the indefinite type Kac-Moody algebras HC[subscript n]1
No full textVictor Kac and Robert Moody independently introduced Kac-Moody algebras around 1968. These Lie algebras have numerous applications in physics and mathematics and thus have been the subject of much study over the last three decades. Kac-Moody algebras are classified as finite, affine, or indefinite type. A basic problem concerning these algebras is finding their root multiplicities. The root multiplicities of finite and affine type Kac-Moody algebras are well known. However, determining the root multiplicities of indefinite type Kac-Moody algebras is an open problem. In this thesis we determine the multiplicities of some roots of the indefinite type Kac-Moody algebras HC[subscript n]⁽¹⁾.
A well known construction allows us to view HC[subscript n]⁽¹⁾ as the minimal graded Lie algebra with local part V direct sum g₀ direct sum V', where g₀ is the affine Kac-Moody algebra C[subscript n]⁽¹⁾. and V,V' are suitable
g₀-modules. From this viewpoint, root spaces of HC[subscript n]⁽¹⁾ become weight spaces of certain C[subscript n]⁽¹⁾-modules. Using a multiplicity formula due to Kang we reduce our problem to finding weight multiplicities in certain irreducible highest weight C[subscript n]⁽¹⁾-modules. We then use crystal basis theory for the affine Kac-Moody algebras C[subscript n]⁽¹⁾ to find these weight multiplicities.
With this strategy we calculate the multiplicities of some roots of HC[subscript n]⁽¹⁾. In particular, we determine the multiplicities of the level two roots -2(alpha₋₁)-k(delta) of HC[subscript n]⁽¹⁾
for 1 less than or equal to k less than or equal to 10. We also show that the multiplicities of the roots of HC[subscript n]⁽¹⁾
of the form -l(alpha₋₁) -k(delta) are n for l equal to k and 0 for l greater than k.
In the process, we observe that Frenkel's conjectured bound for root multiplicities does not hold for the indefinite
Kac-Moody algebras HC[subscript n]⁽¹⁾
VIBRATIONAL RELAXATION IN THE BINARY GASEOUS MIXTURES AND
No full textAuthor Institution: Laboratoire de Spectronomie Moleculaire, Universit\'e de Paris VI, 4, Place Jussieu - Tour 13Vibrational relaxation rates for gaseous mixtures , with or , in which vibrational energy transfer can occur from the level of M to the v = 1 level of , has been measured as a function of the temperature using the laser-induced vibrational fluorescence technique. The relaxation processes which must be considered are: - the V-V transfer process: \begin{eqnarray*} &&M(00^{\circ }1)+ HC (v=0)\begin{array}{c}^{k}M-HC\ell\\ \rightleftharpoons\\ ^{k}HC\ell-M\end{array}M(00^{\circ}0)+ HC\ell(v=1)+ \Delta E=he\Delta\nu\\ &&with\ \Delta\nu=-537\, cm^{-1} for\ CO_{2}, -663\, cm ^{-1}\ for\ N_{2}O \end{eqnarray*} - the V-TR de-excitation processes: \begin{eqnarray*} M(00^{\circ}1)+ HC\ell(or M)\stackrel{k^{HC\ell}_{M}}{(o\vec{r}\; k_{M})}M(mn^{\ell}0)+HC\ell (or \; M)\\ HC\ell(v=1)+ M(or\; HC\ell)\stackrel{k^{M}_{HC\ell}}{(o\vec{r}\; k_{HC\ell})}HC\ell(v=0)+M(or \; HC\ell) \end{eqnarray*} For most of the systems in which near-resonant V-V transfers occur, the V-TR de-excitation rates are negligible compared to the V-V transfer rates. But this is not the case for the M-HC systems considered in this work. The de-excitation rates and are of the same order of magnitude as the V-V transfer rates and respectively. In order to determine separately all these rates, relaxation measurements have been performed by exciting either H to the level or to the v = 1 level, and measuring the relaxation rates versus the molar fraction of the gas excited by laser. The results are discussed and compared with the values of the rates calculated by using a Morse potential as the intermolecular potential, and according to a semi-classical method in which a vibration-rotation exchange is assumed
VIBRATIONAL COUPLINGS AND ENERGY FLOW IN COMPLEXES OF HC=CH, HC=CD, HC=CC=C, AND N=CH WITH
No full textAuthor Institution: Molecular Physics Division, National Institute of Standards and Technology; Molecular Physics Divisoin, National Institute of Standards and TechnologyInfrared spectra of the C-H stretching vibrations of the symmetric-top complexes, , have been recorded using a color-center-laser electric-resonance optothermal spectrometer. Efforts to observe the N-H stretches were unsuccessful. The hydrogen-bonded C-H stretching modes of HC=CH--NH3 are strongly coupled to the hydrogen bond as evidenced by their large monomer red-shifts of 75 and and broad predissociation linewidths of 2000 ad 650-800 MHz, respectively. The complexation-induced asymmetry in is not sufficient to allow us to observe the local mode associated with the outer C-H stretch. However, isotopic substitution in shows that this mode is red shifted by less than from the monomer vibration. The narrow predissociation linewidths of this mode (7-12 MHz) are consistent with this small red shift. The weaker coupling of the C-H stretches in HC=CC=CH is completely quenched upon complexation with . The outer C-H stretch is observed in the diacetylene (HC=CC=CH) complex, blue shifted by approximately from the infrared-active monomer C-H stretch at ; the bound CH stretch is red shifted about the same amount as in . These observations imply that the weak coupling of the local modes in diacetylene is significantly quenched upon complexation with . The predissociation linewidths are similar to those in , even though the outer C-H stretch is now five bonds away from the hydrogen bond. Surprisingly, these results suggest that the length of the triple-bond backbone in acetylene chains does not significantly impede the rate of vibrational energy flow. Future efforts will be made to extend these studies to the triacelyne complex,
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