## Search

Now showing items 1-20 of 227

#### What is the appropriate use of sunscreen for infants and children?

(Family Physicians Inquiries Network, 2006)

The risk and benefits of sunscreen use for children under the age of 6 months are unknown. To avoid sunburn, infants should be kept out of direct sunlight and be covered with protective clothing (strength of recommendation ...

#### What is the best treatment for infants with colic?

(Family Physicians Inquiries Network, 2006)

Infantile colic, defined as excessive crying in an otherwise healthy baby, is a distressing phenomenon, but there is little evidence to support the many treatments offered. Several small studies report some benefit from ...

#### What is the best test to detect herpes in skin lesions?

(Family Physicians Inquiries Network, 2006)

Polymerase chain reaction (PCR) techniques appear to be more sensitive and specific in detecting herpes simplex virus (HSV) in genital lesions (strength of recommendation [SOR]: A, based on 2 diagnostic cohort studies); ...

#### What is the best surveillance for hepatocellular carcinoma in chronic carriers of hepatitis B?

(Family Physicians Inquiries Network, 2006)

Screening patients with chronic hepatitis B infection (HBsAg+) for hepatocellular carcinoma by alpha-fetoprotein (AFP) or by AFP plus ultrasound (AFP/US) detects hepatocellular carcinoma tumors at earlier stages and increases ...

#### Relaxation in Time-Dependent Current-Density-Functional Theory

(American Physical Society, 2006)

We apply the time-dependent current-density-functional theory to the study of the relaxation of a closed many-electron system evolving from a nonequilibrium initial state. We show that the self-consistent unitary time ...

#### Explicit Fermi coordinates and tidal dynamics in de Sitter and Gödel spacetimes

(American Physical Society, 2006)

Fermi coordinates are directly constructed in de Sitter and Gödel spacetimes and the corresponding exact coordinate transformations are given explicitly. The quasi-inertial Fermi coordinates are then employed to discuss ...

#### Helicity-rotation-gravity coupling for gravitational waves

(American Physical Society, 2006)

The consequences of spin-rotation-gravity coupling are worked out for linear gravitational waves. The coupling of helicity of the wave with the rotation of a gravitational-wave antenna is investigated and the resulting ...

#### Characterization of porous low-k films using variable angle spectroscopic ellipsometry

(American Institute of Physics, 2006)

Variable angle spectroscopic ellipsometry (VASE™) is used as a tool to characterize properties such as optical constant, thickness, refractive index depth profile, and pore volume fraction of single and bilayer porous low-k ...

#### Permittivity enhancement of aluminum oxide thin films with the addition of silver nanoparticles

(American Institute of Physics, 2006)

Multilayer reactive electron-beam evaporation of thin aluminum oxide layers with embedded silver nanoparticles (Ag-nps) has been used to create a dielectric thin film with an enhanced permittivity. The results show a ...

#### Dynamics of extended spinning masses in a gravitational field

(American Physical Society, 2006)

We develop a first-order approximation method for the influence of spin on the motion of extended spinning test masses in a gravitational field. This approach is illustrated for approximately circular equatorial motion in ...

#### Toward a Nonlocal Theory of Gravitation

(arXiv, 2006)

The nonlocal theory of accelerated systems is extended to linear gravitational waves as measured by accelerated observers in Minkowski spacetime. The implications of this approach are discussed. In particular, the nonlocal ...

#### The gravitomagnetic clock effect and its possible observation

(arXiv, 2006)

The general relativistic gravitomagnetic clock effect involves a coupling between the orbital motion of a test particle and the rotation of the central mass and results in a difference in the proper periods of two ...

#### Dissipation through spin Coulomb drag in electronic spin transport and optical excitations

(American Physical Society, 2006)

Spin Coulomb drag (SCD) constitutes an intrinsic source of dissipation for spin currents in metals and semiconductors. We discuss the power loss due to SCD in potential spintronics devices and analyze in detail the associated ...

#### Analytic expression for the diamagnetic susceptibility of a uniform electron gas

(American Physical Society, 2006)

The diamagnetic (Landau) susceptibility is a key ingredient in current-density functional theory. We calculate this quantity of a uniform electron gas beyond the random-phase approximation and present an analytic expression ...

#### Time-Dependent Density-Functional Theory beyond the Local-Density Approximation

(American Physical Society, 2006)

Approximations for the ground-state exchange-correlation potential of density-functional theory have reached a high level of sophistication. By contrast, time- or frequency-dependent exchange-correlation potentials are ...

#### Aberration and the Fundamental Speed of Gravity in the Jovian Deflection Experiment

(ar, 2006)

We describe our explicit Lorentz-invariant solution of the Einstein and null geodesic equations for the deflection experiment of 2002 September 8 when a massive moving body, Jupiter, passed within 3.7' of a line-of- sight ...

#### The effacing principle in the post-Newtonian celestial mechanics

(arXiv, 2006)

First post-Newtonian (PN) approximation of the scalar-tensor theory of gravity is used to discuss the effacing principle in N-body system, that is dependence of equations of motion of spherically-symmetric bodies comprising ...

#### Behavior of hexane on graphite at near-monolayer densities: Molecular dynamics study

(American Physical Society, 2006)

We present the results of molecular-dynamics studies of hexane physisorbed onto graphite for eight coverages in the range 0.875⩽ρ⩽1.05 (in units of monolayers). At low temperatures, the adsorbate molecules form a uniaxially ...

#### On the Speed of Gravity and Relativistic v/c Corrections to the Shapiro Time Delay

(arXiv, 2006)

Recent papers by Samuel [1,2] declared that the linearized post-Newtonian v/c effects are too small to have been measured in the recent experiment involving Jupiter and quasar J0842+1845 [3,4,5] that was used to measure ...

#### Universality away from critical points in two-dimensional phase transitions

(arXiv, 2006)

The p-state clock model in two dimensions is a system of discrete rotors with a quasi-liquid phase in a region T1 < T < T2 for p > 4. We show that, for p > 4 and above a temperature Teu, all macroscopic thermal averages, ...