Biomedical subjects

J F Ely

Publications and source records attributed to J F Ely.

6 recordsLinked to original sources

PubMed2004

Thermal conductivity of molten alkali halides from equilibrium molecular dynamics simulations.

The thermal conductivity of molten sodium chloride and potassium chloride has been computed through equilibrium molecular dynamics Green-Kubo simulations in the microcanonical ensemble (N,V,E). In order to access the temperature dependence of the thermal conductivity coefficient of these materials, the simulations were performed at five different state points. The form of the microscopic energy flux for ionic systems whose Coulombic interactions are calculated through the Ewald method is discussed in detail and an efficient formula is used by analogy with the methods used to evaluate the stress tensor in Coulombic systems. The results show that the Born-Mayer-Huggins-Tosi-Fumi potential predicts a weak negative temperature dependence for the thermal conductivity of NaCl and KCl. The simulation results are in agreement with part of the experimental data available in the literature with simulation values generally overpredicting the thermal conductivity by 10%-20%.

Journal Article↗

PubMed2004

Simplified crossover droplet model for adsorption of pure fluids in slit pores.

We present a generalized crossover (GC) model for the excess adsorption of pure fluids at a flat solid-liquid interface, which reproduces scaling behavior of the excess adsorption in the critical region and is reduced to the classical, van der Waals-type analytical model far away from the bulk critical point. In developing this model, we used the density-functional theory (DFT) approach for the order parameter profile calculations with a generalized corresponding states model for the local free-energy density. The GC DFT model well represents the available experimental adsorption data for Kr/graphite, C2H4/graphite, C3H8/graphite, CO2/silica, and SF6/graphite systems in the entire density range 0 < rho < or = 3rhoc and temperatures up to 1.7Tc. In the critical region 0.5 rhoc < r < or = 1.5rhoc and T < or = 1.15Tc, the GC DFT model is consistent with the predictions of the asymptotic renormalization-group crossover model for the critical adsorption in a semi-infinite system developed earlier. For the excess adsorption on the critical isochore, both theories predict a scaling-law behavior Gamma proportional tau(-nu+beta), but fail to reproduce a "critical depletion" of the excess adsorption along the critical isochore of the SF6/graphite system near Tc. We show that an anomalous decrease of adsorption observed in this system at tau = T/Tc - 1 < 10(-2) can be explained by finite-size effect and develop a simplified crossover droplet (SCD) model for the excess adsorption in a slit pore. With the effective size of the pore of L = 50 nm, the SCD model reproduces all available experimental data for SF6/graphite, including the critical isochore data where tau-->0, within experimental accuracy. At L >> xib (where xib is a bulk correlation length) the SCD model is transformed into the GC DFT model for semi-infinite systems. Application of the SCD model to the excess adsorption of carbon dioxide on the silica gel is also discussed.

Journal Article↗

PubMed1996

Less is more: a conservative approach to male rhinoplasty.

Rhinoplasty in men has caused more traumatic problems of dissatisfaction, as compared to women, ranging from higher rates of complaints to murder of the surgeon. After an evaluation of the special problems related to change, I chose to reduce the amount of hump resected and to restrict the elevation of the nasal tip-nasolabial angle to a minimum compatible with normal appearance. The purpose is to avoid the tag of "operated nose." Some illustrative cases are shown. The goal is presented as precision, discretion, and satisfaction. Sometimes, doing less is more.

Adult↗

PubMed1988

Small incision otoplasty for prominent ears.

A 5-cm incision and an elliptical skin excision are part of almost all surgical techniques designed to correct prominent ears. It is proposed that two 0.5-cm incisions be used that give access to the lateral surface of the auricular cartilage, which is thinned with a rasp along the antihelix and concha. The skin is not removed at all. Results obtained with this technique are presented.

Age Factors↗

PubMed1983

The devil's incision mammoplasty.

Combination of an oblique ellipse with a half-moon incision around the lower half of the areola is presented by the author to treat breast hypotrophy and moderate ptosis without resorting to implant of foreign material. The crescent combined with an oblique ellipse forms a little devil's figure. A deepidermized dermafat flap, with blood supply coming from the areolar area, increases the apparent volume of the breast. This technique is best used in cases of moderate ptosis in which no change in the position of the nipple is necessary. When there is hypertrophy, excess mammary tissue can be removed simultaneously with the cutaneous ellipse.

Breast↗

PubMed1981

Guidelines for reduction mammaplasty.

Symptoms of breast hypertrophy are discussed. Both physical and psychological indications for corrective procedures are related to patients' expectations. Shape is discussed in terms of the patient's preference, her activities, and her geographic and historic background. Two main techniques are described--the Arié-Pitanguy-Ribeiro technique with a dermis-fat flap, which is recommended for extremely ptotic breasts, and the oblique technique, which is preferred for rounder hypertrophic breasts. In small ptoses the original Arié vertical wedge excision technique is still indicated. All patients are treated by the Schwarzmann maneuver with preservation of the periareolar nerves and vessel network, and areola transposition at the end of the operation. No drains are used.

Breast↗