Optical Properties of LiF–Li2O –WO3–B2O3 Glasses

<p>Glass with compositions xLiF–(30−x)Li₂O –10WO₃–60B₂O₃ for 5 ≤ x ≤ 25 mol% have been prepared using the normal melt quenching technique. The optical absorption and reflection spectra were recorded at room temperature in the wavelength range 300-800 nm. From the absorption edge studies, the values of the optical band gap (E_opt) and Urbach energy (ΔE) have been evaluated. The values of E_opt and ΔE vary non-linearly with composition parameter, showing the mixed alkali effect.</p>

Теплопроводность твердых растворов Cu-=SUB=-2-=/SUB=-ZnGe-=SUB=-1-x-=/SUB=-Sn-=SUB=-x-=/SUB=-Se-=SUB=-4-=/SUB=-

Cu_2ZnGeSe_4 and Cu_2ZnSnSe_4 and Cu_2ZnGe_1 –_ x Sn_ x Se_4-alloy crystals are grown by the Bridgman method (vertical variant). The composition and structure of the crystals are determined. It is established that both the initial compounds and their alloys crystalize with the formation of tetragonal structure. The unit-cell parameters a and c of the crystals are calculated, and the dependences of these parameters on the composition of the alloys are constructed. It is shown that, under variations in the composition parameter x , the parameters a and c vary in accordance with Vegard’s law. The thermal conductivity of the Cu_2ZnGeSe_4 and Cu_2ZnSnSe_4 compounds and Cu_2ZnGe_1 –_ x Sn_ x Se_4 alloys is measured in the temperature range 300–600 K. It is found that the thermal conductivity varies with x , with a minimum for the medium composition.

Study of relativistic magnetized outflows with relativistic equation of state

ABSTRACT We study relativistic magnetized outflows using relativistic equation of state having variable adiabatic index (Γ) and composition parameter (ξ). We study the outflow in special relativistic magnetohydrodynamic regime, from sub-Alfvénic to super-fast domain. We showed that, after the solution crosses the fast point, magnetic field collimates the flow and may form a collimation-shock due to magnetic field pinching/squeezing. Such fast, collimated outflows may be considered as astrophysical jets. Depending on parameters, the terminal Lorentz factors of an electron–proton outflow can comfortably exceed few tens. We showed that due to the transfer of angular momentum from the field to the matter, the azimuthal velocity of the outflow may flip sign. We also study the effect of composition (ξ) on such magnetized outflows. We showed that relativistic outflows are affected by the location of the Alfvén point, the polar angle at the Alfvén point and also the angle subtended by the field lines with the equatorial plane, but also on the composition of the flow. The pair dominated flow experiences impressive acceleration and is hotter than electron–proton flow.

Validation of a new prognostic body composition parameter in cancer patients.

11597 Background: In cancer patients protein-calorie imbalances are responsible for decreased lean body mass and, in turn, for worse clinical outcome. We evaluated the prognostic value of a new body composition parameter (creatinine height index [CHI]) obtained from bioimpedance vectorial analysis-derived body cell mass and its association with nutritional and functional status. Methods: Data from Italian and German cancer patients based on information from previous prospective cohort studies were used. Multivariable models (adjusted for age, gender, hydration status, performance status, and disease stage) were built in both cohorts to assess the association between body composition outcome parameters (low fat-free mass [FFM], <15 [females] and <17 [males] kg/m2; low standardized phase angle [SPA], <-1.65; low CHI, <510 [females] and <660 [males] mg/24h/m) and 1-year all-cause mortality, low body mass index (BMI; <20 [<70 years] and <22 [>/=70 years] kg/m2), clinically significant weight loss (WL; >/=10% in 6 months) and low handgrip strength (HG; <20 [females] and <30 [males] kg). Results: Overall, 1084 cancer patients were included (Italians, N=454; Germans, N=630). Low CHI was independently associated with mortality in both Italian and German cohorts (Table). Low FFMI and low SPA did not predict survival in the German cohort. In patients with low CHI, worse nutritional and functional status were observed in both study populations. Performance of models addressing the study endpoints showed substantial consistency with both cohorts, particularly of those including low CHI. Conclusions: We validated a new prognostic body composition parameter, which is easier to interpret than standard nutritional parameters and may be useful for identifying cancer patients at nutritional risk, requiring early nutritional support. [Table: see text]