Manifestations of Drag Reduction by Polymer Additives in Decaying, Homogeneous, Isotropic Turbulence

The existence of drag reduction by polymer additives, well established for wall-bounded turbulent flows, is controversial in homogeneous, isotropic turbulence. To settle this controversy we carry out a high-resolution direct numerical simulation (DNS) of decaying, homogeneous, isotropic turbulence with polymer additives. Our study reveals clear manifestations of drag-reduction-type phenomena: On the addition of polymers to the turbulent fluid we obtain a reduction in the energy dissipation rate, a significant modification of the fluid energy spectrum especially in the deep-dissipation range, a suppression of small-scale intermittency, and a decrease in small-scale vorticity filaments.Comment: 4 pages, 3 figure

Lodging Marketing Literature: Analysis of Journals

Unlike the services marketing literature, lodging research publications appear to be limited to a few general topic areas. The authors present a comparative analysis of the evolution of lodging marketing and services marketing research and provides direction for future research agendas

Organotin(IV) & Organoxytitanium(IV) Diphenyl Phosphinates

463-46

N-Benzoyl-N-phenylhydroxylarnine & Cyclohexanol Derivatives of Ti(IV)*

132-13

Universal properties of the two-dimensional Kuramoto-Sivashinsky equation

We investigate the properties of the Kuramoto-Sivashinsky equation in two spatial dimensions. We show by an explicit, numerical, coarse-graining procedure that its long-wavelength properties are described by a stochastic, partial differential equation of the Kardar-Parisi-Zhang type. From the computed parameters in our effective, stochastic equation we argue that the length and time scales over which the correlation functions cross over from linear diffusive to those of the full nonlinear equation are very large. The behavior of the three-dimensional equation is also discussed

Obstetrics critical care: a 2 years retrospective study in a medical college hospital of western India

Background: This study highlights the possibilities of new contribution to the management of high risk pregnancies and those pregnancies with unpredictable outcomes. The objective was to study the incidence and the clinical profile of antenatal and postpartum women requiring admission to the ICU, the interventions required in these women and final outcome.Methods: A retrospective cohort study of all obstetric critical care admissions during 2-year period from January 2016 to December 2017 was done at 1296 bedded tertiary care hospital. During the study total 349 obstetric patients were admitted to the ICU. The data were analysed by using percentage.Results: Primigravida (54.73%) were more as compared to multigravida (45.27%). Only 15.76% patients were in antepartum period while majority of patients (84.24%) were admitted during postpartum period. The main obstetric indications for ICU admission were pregnancy-induced hypertension (14.32%) followed by obstetric hemorrhage (9.16%) and community acquired pneumonia (7.44%). Other indications were valvular heart disease (5.44%), ANC with severe anemia (1.72%), monitoring (6.30%). In the present study maternal mortality among the women admitted to ICU was 18.05%. The leading cause of maternal death was obstetric hemorrhage (28.57%) followed by pregnancy induced hypertension (25.40%). An ICU intervention during the stay of the patients in terms of mechanical ventilation was used in 250 (71.63%) cases.Conclusions: A high quality multidisciplinary care is required in complicated pregnancies for safe motherhood. So, there is a need for dedicated ICU for obstetric patients

Density-functional theory for classical fluids and solids

We formulate a density-functional theory that is capable of describing simultaneously the solid, liquid, and gas phases of a simple classical material. The formalism can be reduced to the Ebner-Saam-Stroud theory for the liquid-gas case and to a generalized version of the Ramakrishnan-Youssouff theory for the liquid-solid case. The theory requires as input the direct correlation functions of a uniform fluid. As an example we apply the formalism to the calculation of the phase diagram of a system with Lennard-Jones intermolecular interactions. We obtain the correlation functions from a closure scheme proposed by Zerah and Hansen [J. Chem. Phys. 84, 2336 (1986)]. The calculated density-temperature phase diagram compares favorably with those obtained from numerical simulations of the same model system. We also compute the equations of state in the solid and fluid phases

In vivo NMR as a tool for probing molecular structure and dynamics in intact Chlamydomonas reinhardtii cells

Article / Letter to editorLeiden Institute of Chemistry;Leiden Institute of Chemistr