Search Results - (Author, Cooperation:K. L. Miller)

2018-01-13

The American Society for Pharmacology and Experimental Therapeutics (ASPET)

0026-895X

1521-0111

Chemistry and Pharmacology

Medicine

2018-08-01

Genetics Society of America (GSA)

2160-1836

Biology

2018-10-16

The American Association for Cancer Research (AACR)

1078-0432

1557-3265

Medicine

2011-11-05

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

Animals ; Female ; Gyrus Cinguli/*anatomy & histology/physiology ; Hierarchy, Social ; Macaca ; Magnetic Resonance Imaging ; Male ; Nerve Net ; *Neural Pathways ; Organ Size ; Prefrontal Cortex/*anatomy & histology/physiology ; *Social Behavior ; Temporal Lobe/*anatomy & histology/physiology

1089-7550

AIP Digital Archive

Physics

An analysis is presented to accurately calculate the effects of photon recycling on the minority-carrier lifetime in the active region of GaAs/Al0.3Ga0.7As double heterostructures. It is shown that the minority-carrier lifetime multiplication factor and resulting minority-carrier lifetime are dominated by multiple reflection propagation for samples with thicknesses of approximately less than 1.0 μm. The calculated results are in good agreement with previously published experimental data on the variation of the minority-carrier lifetime multiplication factor with active region thickness, indicating the usefulness of the analysis to accurately model the effects of photon recycling in transient photoluminescence measurement of thin devices. This may lead to accurate determination of the minority-carrier lifetime, diffusion coefficient, and surface recombination velocities at the levels of interest for device applications.

Electronic Resource

1077-3118

AIP Digital Archive

Physics

The minority-carrier lifetime has been measured by time-resolved photoluminescence in epitaxial films of GaAs grown by metalorganic chemical vapor deposition. The measured lifetimes in thicker devices are 4 to 6 times the theoretical or radiative lifetime. These long lifetimes are the result of photon recycling or self-generation of the self-absorbed radiation.

Electronic Resource

1365-2516

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Summary.  Venous access is essential for delivery of haemophilia factor concentrate. Wherever possible, peripheral veins remain the route of choice, and the use of central venous access devices (CVADs) should be limited to cases of clear need in patients with caregivers able to exercise diligence in CVAD care and should continue no longer than necessary. CVADs are of recognized value for repeated administration of coagulation factors in haemophilia, particularly for prophylaxis and immune tolerance therapy and in young children. Evidence to guide best practices has been fragmentary, and standardized methods for CVAD usage have yet to be established. We have developed management recommendations based upon available published evidence as well as extensive clinical experience. These recommendations address patient and CVAD selection; CVAD placement, care and removal; caregiver/patient guidance; and complications, including infection and thrombosis. In the absence of inhibitors, ports are recommended, primarily because of fewer associated infections than with external catheters. For patients with inhibitors, ports also appear to be associated with fewer infections. Infection is the most frequent complication, and recommendations to prevent and treat infections are supported by extensive clinical data and experience. Strict adherence to handwashing and aseptic technique are essential elements of catheter care. Evidence-based data regarding the detection and treatment of CVAD-related thrombotic complications are limited. Caregiver education is an integral part of CVAD use and the procedural practices of users should be regularly re-assessed. These recommendations provide a basis for sound current CVAD practice and are expected to undergo further refinements as new evidence is compiled and clinical experience is gained.

Electronic Resource

1439-0426

Blackwell Publishing Journal Backfiles 1879-2005

Biology

Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

There is a current need to establish scientific guidelines for Best Environmental Practice for the regulation and monitoring of marine aquaculture throughout the European Union. This paper will demonstrate how the ‘MARAQUA’ Concerted Action will address this need using several methods including a comprehensive literature review and production of a computerized bibliography, establishment of a ‘Register of Experts’ and a worldwide website, circulation of a newsletter and a series of workshops. A brief comparison of the regulations and monitoring programmes associated with marine aquaculture in European countries is briefly outlined. These issues are described in depth in the individual country reviews presented in this special edition of the Journal.

Electronic Resource

1618-2650

Springer Online Journal Archives 1860-2000

Chemistry and Pharmacology

Conlusions The Near-Infrared method for the determination of ethylbenzene hydroperoxide in ethylbenzene is suitable for use in a laboratory, and potentially on-line, with no sample pretreatment necessary.

Electronic Resource

1572-9672

Springer Online Journal Archives 1860-2000

Physics

Abstract Dynamics play an important role in defining the characteristics of the Venus ionosphere. The absence of a significant internal magnetic field at Venus allows the ionization to respond freely to gradients in the plasma pressure. The primary response to a gradient in plasma pressure is the nightward flow of the ionization away from a photoionization source on the dayside. The flow is approximately symmetric about the Sun-Venus axis and provides the source of O+ that maintains the nightside ionosphere during solar maximum. Modelling efforts have generally been successful in describing the average nightward ion velocity. Asymmetric and temporally-variable flow is measured, but is not well described by the models. Departures from axially-symmetric flow described in this paper include ionospheric superrotation at low altitudes and an enhanced flow at high altitude at the dawn terminator. Variability that is the result of changes in the ionopause height induced by changes in solar wind dynamic pressure is especially strong on the nightside. Ion flow to the nightside is also reduced during solar minimum because of a depressed ionopause.

Electronic Resource

1573-2681

73B40 ; 73C02 ; 73C10 ; 35J40

Springer Online Journal Archives 1860-2000

Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Physics

Abstract In the linear theory of elasticity, Saint-Venant's principle is used to justify the neglect of edge effects when determining stresses in a body. For isotropic materials, the validity of this is well established. However for anisotropic and composite materials, experimental results have shown that edge effects may persist much farther into the material than for isotropic materials and as a result cannot be neglected. This paper further examines the effects of material anisotropy on the exponential decay rate for stresses in a semi-infinite elastic strip. A linearly elastic semi-infinite strip in a state of plane stress/strain subject to a self-equilibrated end load is considered first for a specially orthotropic material and then for the general anisotropic material. The problem is governed by a fourth-order elliptic partial differential equation with constant coefficients. In the former case, just a single dimensionless material parameter appears, while in the latter, only three dimensionless parameters are required. Energy methods are used to establish lower bounds on the actual stress decay rate. Both analytic and numerical estimates are obtained in terms of the elastic constants of the material and results are shown for several contemporary engineering materials. When compared with the exact stress decay rate computed numerically from the eigenvalues of a fourth-order ordinary differential equation, the results in some cases show a high degree of accuracy. In particular, for strongly orthotropic materials, an asymptotic estimate provides extremely accurate estimates for the decay rate. Results of the type obtained here have several important practical applications. For example, they provide physical insight into the mechanical testing of anisotropic and laminated composite structures (including the off-axis tension test), are useful in assessing the influence of fasteners, joints, etc. on the behavior of composite structures and allow for “tailoring” a material with specific properties to ensure that local stresses attenuate at a desired rate.

Electronic Resource