FEDSM2003-45542 MECHANISTIC MODELS FOR DROPLET FORMATION AND BREAKUP

ABSTRACT Mechanistic models are created to predict the smallest droplet or bubble of a low concentration, inviscid, dispersed fluid that can be formed by shear from the continuous fluid (or droplet impact on a wall) and the largest droplet/bubble that can survive in a shear flow. Weber number criteria are developed for both the smallest and largest droplet/bubbles based on energy and force balances. The droplet deformation is predicted from an energy balance between available energy from drag on the droplet and energy required to deform the droplet. Different droplet deformation geometries are incorporated into the deformation model and compared against available data from the literature. The oblate spheroid deformation was found to provide the better prediction of deformation, terminal velocity, and largest droplet than a sphere, disk or spherical segment. The droplet deformation and breakup models are believed to be applicable to breakup of droplets, bubbles, and dual dispersions in a wide variety of conditions. These relatively simple models compare favorably against experimental data for low viscosity dispersed liquids and have been successfully used to predict liquid carry-over and gas carry-under from various gas/liquid separators. These models have been incorporated into simulation software used to design predict performance of compact separation equipment 1,2

Investigation of A1g phonons in YBa2Cu3O7 by means of LAPW atomic-force calculations

We report first-principles frozen-phonon calculations for the determination of the force-free geometry and the dynamical matrix of the five Raman-active A1g modes in YBa2Cu3O7. To establish the shape of the phonon potentials atomic forces are calculated within the LAPW method. Two different schemes - the local density approximation (LDA) and a generalized gradient approximation (GGA) - are employed for the treatment of electronic exchange and correlation effects. We find that in the case of LDA the resulting phonon frequencies show a deviation from experimental values of approximately -10%. Invoking GGA the frequency values are significantly improved and also the eigenvectors are in very good agreement with experimental findings.Comment: 15 page

Phonon dispersion and electron-phonon interaction for YBa_2Cu_3O_7 from first-principles calculations

We present a first principles investigation of the lattice dynamics and electron-phonon coupling of the high-T_c superconductor YBa_2Cu_3O_7 within the framework of density functional perturbation theory using a mixed-basis pseudopotential method. The calculated phonon dispersion curves are in excellent agreement with Raman, infrared and neutron data. Calculation of the Eliashberg function alpha^2F leads to a small electron-phonon coupling lambda=0.27 in disagreement with earlier approximate treatments. Our calculations strongly support the view that conventional electron-phonon coupling is not an important contribution to superconductivity in high-T_c materials.Comment: 4 pages, 4 figure

The Quadrupole Magnets for the LHC Injection Transfer Lines

Two injection transfer lines, each about 2.8 km long, are being built to transfer protons at 450 GeV from the Super Proton Synchrotron (SPS) to the Large Hadron Collider (LHC). A total of 180 quadrupole magnets are required; they are produced in the framework of the contribution of the Russian Federation to the construction of the LHC. The classical quadrupoles, built from laminated steel cores and copper coils, have a core length of 1.4 m, an inscribed diameter of 32 mm and a strength of 53.5 T/m at a current of 530 A. The total weight of one magnet is 1.1 ton. For obtaining the required field quality at the small inscribed diameter, great care in the stamping of the laminations and the assembly of quadrants is necessary. Special instruments have been developed to measure, with a precision of some mm, the variations of the pole gaps over the full length of the magnet and correlate them to the obtained field distribution. The design has been developed in a collaboration between BINP and CERN. Fabrication and the magnetic measurements are done at BINP and should be finished at the end of the year 2000

Transperitoneal laparoscopic right radical nephrectomy for renal cell carcinoma and end-stage renal disease: a case report

Nephron-sparing surgery (partial nephrectomy) results are similar to those of radical nephrectomy for small (<4 cm) renal tumors. However, in patients with end-stage renal disease, radical nephrectomy emerges as a more efficient treatment for localized renal cell cancer. Laparoscopic radical nephrectomy (LRN) increasingly is being performed. The objective of the present study was to present a case of a patient under hemodialysis who was submitted to LRN for a small renal mass and discuss the current issues concerning this approach. It appears that radical nephrectomy should be the standard treatment in dialysis patients even for small tumors. The laparoscopic technique is associated with acceptable cancer-specific survival and recurrence rate along with shorter hospital stay, less postoperative pain and earlier return to normal activities

Safety and efficacy of a feed additive consisting of pancreatin from porcine pancreas (Pan-zoot) for dogs (Almapharm GmbH + Co KG)

Following a request from the European Commission, EFSA was asked to deliver a scientific opinion on the safety and efficacy of a pancreatic extract (Pan-zoot) as a zootechnical additive for dogs. The EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP) could not conclude on the safety of Pan-Zoot as a feed additive for dogs under the proposed conditions of use. The FEEDAP Panel could not conclude on the skin/eye irritancy potential of the additive or on the dermal sensitisation potential. Owing to its proteinaceous nature, the additive is considered a respiratory sensitiser. The additive may induce allergic reactions to the exposed users. The Panel concluded that there is no need for an environmental risk assessment. The FEEDAP Panel could not conclude on the efficacy of the product as a feed additive at the recommended conditions of use

Safety and efficacy of a feed additive consisting of 3-phytase produced by Komagataella phaffii (CECT 13171) (FSF10000/FLF1000) for poultry species, pigs for fattening and minor porcine species (FERTINAGRO BIOTECH S.L.)

Following a request from the European Commission, EFSA was asked to deliver a scientific opinion on the safety and efficacy of 3-phytase produced by Komagataella phaffii (CECT 13171) (FSF10000/FLF1000) as a zootechnical additive for poultry species, pigs for fattening and minor porcine species. The production strain (CECT 13171) is genetically modified and was developed from a strain that had been previously assessed by the FEEDAP Panel. The genetic modifications present in K. phaffii CECT 13171 do not raise safety concerns and no recombinant DNA was detected in the final formulations of the additive (FSF10000/FLF1000). However, the Panel&nbsp;could not conclude on the identity of the production strain and uncertainty remained on the possible presence of viable cells of the production strain in the final formulations. Owing to these uncertainties, the FEEDAP Panel&nbsp;could not conclude on the safety of the additive regarding the production strain. The additive in either form is not irritant to eyes and skin, the liquid formulation is not a dermal sensitiser but the solid formulation is, and the two formulations should be considered potential respiratory sensitisers. The FEEDAP Panel&nbsp;concluded that the 3-phytase present in the additive is safe for the target species at a level of 1,000&nbsp;FTU/kg feed and that would not raise safety concerns for the environment. However, considering the uncertainties on the identification of the production strain and the possible presence of viable cells in the final formulations, the Panel&nbsp;could not conclude on the safety of the additive for the target species, consumer, users, and the environment. The FEEDAP Panel&nbsp;concluded that the additive is efficacious at 500&nbsp;FTU/kg feed in poultry species for fattening or reared for laying/breeding, pigs for fattening and minor porcine species and at 1,000&nbsp;FTU/kg feed in laying hens