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Biomedical subjects

L Phair

Publications and source records attributed to L Phair.

At least 19 recordsLinked to original sources
PubMed2005

Surface partition of large clusters.

The surface partition of large clusters is derived analytically for a simple statistical model by using the Laplace-Fourier transformation method. In the limit of small amplitude deformations, a suggested "hills and dales model" reproduces the leading term of the Fisher result for the surface entropy to within a few percent. The model also gives the degeneracy prefactor of large clusters. The surface partition of finite clusters is also discussed.

Journal Article↗
PubMed2005

The complement: a solution to liquid drop finite size effects in phase transitions.

The effects of the finite size of a liquid drop undergoing a phase transition are described in terms of the complement, the largest (but mesoscopic) drop representing the liquid in equilibrium with the vapor. Vapor cluster concentrations, pressure, and density from fixed mean density lattice gas (Ising) calculations are explained in terms of the complement generalization of Fisher's model. Accounting for this finite size effect is important for extracting the infinite nuclear matter phase diagram from experimental data.

Journal Article↗
PubMed2002

Liquid to vapor phase transition in excited nuclei.

The thermal component of the 8 GeV/c pi+ Au data of the ISiS Collaboration is shown to follow the scaling predicted by Fisher's model when Coulomb energy is taken into account. Critical exponents tau and sigma, the critical point (p(c),rho(c),T(c)), surface energy coefficient c(0), enthalpy of evaporation DeltaH, and critical compressibility factor C(F)(c) are determined. For the first time, the experimental phase diagrams, (p,T) and (T,rho), describing the liquid vapor coexistence of finite neutral nuclear matter have been constructed.

Journal Article↗
PubMed2000

Nuclear multifragmentation, percolation, and the fisher droplet model: common features of reducibility and thermal scaling

It is shown that the Fisher droplet model, percolation, and nuclear multifragmentation share the common features of reducibility (stochasticity in multiplicity distributions) and thermal scaling (one-fragment production probabilities are Boltzmann factors). Barriers obtained, for cluster production on percolation lattices, from the Boltzmann factors show a power-law dependence on cluster size with an exponent of 0.42+/-0.02. The EOS Collaboration Au multifragmentation data yield barriers with a power-law exponent of 0.68+/-0.03. Values of the surface energy coefficient of a low density nuclear system are also extracted.

Journal Article↗
PubMed2000

Living environments and older people.

The influence of care environments on patients has long been a fundamental concern for nurses. Considerations of how environments might be defined, particularly how multiple aspects of environments might impact on any individual, are complex. This article aims to unpick some of the complexities and to offer ideas on how nurses can positively influence environments, particularly in settings where older people live and are offered care.

Activities of Daily Living↗
PubMed1999

Measurements of low-energy (d,n) reactions for BNCT. Boron Neutron Capture Therapy.

Neutron yields and energy spectra have been measured for various deuteron-induced reactions at low energy. Neutrons of energy > 100 keV emitted in the 9Be(d,n)10B, 12C(d,n)13N, and 13C(d,n)14N reactions at Ed= 1.5 MeV were detected at five angles by means of liquid scintillator detectors. While low-energy neutrons were observed in all studied reactions, only 13C(d,n)14N is characterized by a relatively large yield with spectral features potentially interesting for an accelerator-based neutron source for BNCT.

Beryllium↗
PubMed1996

Developing outcome indicators in continuing care: part 2.

In their follow-up to last week's article which described the development of outcome indicators for nursing older people in continuing care settings, the authors describe in detail the process of indicator development. Referring to theoretical models, they provide a practical example of how a nurse could use one of his or her experiences from nursing to illustrate the distinct value of patient interventions provided by a registered practitioner.

Aged↗
PubMed1996

Developing outcome indicators in continuing care: part 1.

In the first of two articles, the authors describe the development of outcome measures for nursing older people in a continuing care setting. They describe why such a process was initiated and the framework which guided the project, including current nursing and government policy and theories of knowledge and expert practice. The second article will appear next week.

Accidental Falls↗