1,721,517 research outputs found
Synthesis and Characterization of A[W2O2F9] (A = Li – Cs)
No full textHerein, we report upon the in situ formation of WOF4 and its subsequent reaction with AF (A = Li – Cs) in aHF to produce A[W2O2F9] (A = Li – Cs). Structural analysis of the obtained compounds was performed using single-crystal X-ray diffraction. A comparison of the single-crystal structures obtained here to the previously reported A[Mo2O2F9] (A = Li – Cs) and H3O[W2O2F9] salts is given. Additionally, IR and Raman spectroscopy were used to characterize each salt. These spectra were compared to calculated ones for the solid-state structure of each salt using the DFT-PBE0 density functional method. The calculated spectra were used to assign bands in the experimental spectra. Both MoOF4 and WOF4 gave similar reaction products under similar reaction conditions. It was concluded that the oxyfluorides show similar Lewis acid-base reactions with the alkali metal fluorides in aHF solutions.Peer reviewe
= Li – Cs)
No full textThe hexafluoridomolybdates(V), A[MoF6] (A = Li – Cs), were synthesized by reacting molybdenum pentafluoride (MoF5) with the alkali metal fluorides in anhydrous hydrogen fluoride (aHF) solution. Single crystals of A[MoF6] (A = Li, Na, Rb, Cs) were grown from solution and analyzed by single‐crystal X‐ray diffraction. The vibrational spectrum of each salt is reported in detail and compared to previously reported spectra. During analysis of the cubic modification of Na[MoF6] it was noticed that a phase transition occurs around 228 K. Some details regarding this phase transition are discussed. Attempts to determine the structure of the low‐temperature phase of Na[MoF6] lead to the observation of the Na[MoF6]·2HF solvate. Additionally, in an attempt to synthesize Na[MoF7] by the oxidation of Na[MoF6] in chlorine trifluoride (ClF3), a tetragonal modification of Na[MoF6] was observed. The crystal structures of the Na[MoF6]·2HF solvate and tetragonal modification of Na[MoF6] are also discussed in detail
Universality of weakly bound dimers and Efimov trimers close to Li-Cs Feshbach resonances
Full text linkWe study the interspecies scattering properties of ultracold Li-Cs mixtures in their two energetically lowest spin channels in the magnetic field range between 800 and 1000 G. Close to two broad Feshbach resonances (FR) we create weakly bound LiCs dimers by radio-frequency association and measure the dependence of their binding energy on the external magnetic field strength. Based on the binding energies and complementary atom loss spectroscopy of three other Li-Cs s-wave FRs we construct precise molecular singlet and triplet electronic ground state potentials using a coupled-channels calculation. We extract the Li-Cs interspecies scattering length as a function of the external field and obtain almost a ten-fold improvement in the precision of the values for the pole positions and widths of the s-wave FRs as compared to our previous work (Pires et al 2014 Phys. Rev. Lett. 112 250404). We discuss implications on the Efimov scenario and the universal geometric scaling for LiCsCs trimers
An ab initio study of Li+ ...CS, a purely electrostatic system
No full textThe Li+ ...CS interaction has been computed by SCF and CISD methods, and it was found to be purely electrostatic with a binding energy De of 33 kcal mol-1 and a bond distance RLi+ -C = 2.107 A. © 1995
Supersymmetric-QCD corrections to (WH -/+)-H-+/- associated production at the CERN large hadron collider
No full textWe calculate the SUSY-QCD corrections to the inclusive total cross sections of the associated production processes pp -> W+/-H-/++X in the Minimal Supersymmetric Standard Model(MSSM) at the CERN Large Hadron Collider(LHC). The SUSY-QCD corrections can increase and decrease the total cross sections depending on the choice of the SUSY parameters. When mu < 0 the SUSY-QCD corrections increase the leading-order (LO) total cross sections significantly for large tan beta (similar to 40), which can exceed 10% and have the opposite sign with respect to the QCD and the SUSY-EW corrections, and thus cancel with them to some extent. Moreover, we also investigate the effects of the SUSY-QCD on the differential distribution of cross sections in transverse momentum p(T) and rapidity Y of W-boson, and the invariant mass MW+H-.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000234274400015&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Astronomy & AstrophysicsPhysics, Particles & FieldsSCI(E)12ARTICLE11null7
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Elucidation of the structural characteristics of the isovalent species Li[CO] and Li[CS] by ab initio calculations
No full textWe have performed ab initio CISD(+ corrections) calculations on the valence isoelectronic molecules Li[CO] and Li[CS] using large basis sets. The Li-CO, Li-OC, Li-CS and Li-SC 2Π states are bound with respect to Li 2P by 38, 8, 70 and 41 kcal/mol, respectively. With the exception of LiCS 2Σ+, which presents a shallow minimum of 4 kcal/mol, all the relevant 2Σ+ states examined are repulsive. Full potential energy curves are also presented for the most interesting of the states
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Cost-effectiveness and economic impact of the KineSpring® Knee Implant System in the treatment of knee osteoarthritis in Italy.
No full textPURPOSE:
The purpose of the present study was to determine whether the KineSpring System is a more effective treatment for knee OA when compared to other standard treatments, considering cost-utility ratios.
METHODS:
A literature search provided data on conservative and surgical treatment costs and functional outcome scores. The KineSpring System outcome scores were obtained from two trials. Quality adjusted life years (QALYs) and cost-utility ratios were calculated for each treatment option assuming a lifetime durability as well as 10-year durability.
RESULTS:
Assuming lifetime durability, the cost-utility ratios of total knee arthroplasty (TKA), unicompartmental knee arthroplasty (UKA), high tibial osteotomy (HTO), the KineSpring System, and conservative treatments, compared to no treatment were €2348±70 per QALY, €2040±61 per QALY, €2281 ± 68 per QALY, €1669±268 per QALY, and €11,688±2185 per QALY, respectively. Assuming a treatment durability of 10 years, the cost-utility ratio of TKA, UKA, HTO, the KineSpring System and conservative treatments, compared to no treatment were €4,884±323 per QALY, €4243±280 per QALY, €4,744 ±313 per QALY, €3757±1353 per QALY, and €10,575±4414 per QALY, respectively.
CONCLUSION:
Compared to current standard-of-care treatments, the KineSpring System has a favorable cost-utility ratio, making it an effective treatment option and a suitable cost-saving alternative. The KineSpring System is associated with lower cost and increased QALYs. Future research is needed to further examine the long-term outcomes associated with the KineSpring System
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