Experimental effects of fuselage camber on longitudinal aerodynamic characteristics of a series of wing-fuselage configurations at a Mach number of 1.41

An experimental investigation was conducted to evaluate a method for the integration of a fighter-type fuselage with a theoretical wing to preserve desirable wing aerodynamic characteristics for efficient maneuvering. The investigation was conducted by using semispan wing fuselage models mounted on a splitter plate. The models were tested through an angle of attack range at a Mach number of 1.41. The wing had a leading edge sweep angle of 50 deg and an aspect ratio of 2.76; the wing camber surface was designed for minimum drag due to lift and was to be self trimming at a lift coefficient of 0.2 and at a Mach number of 1.40. A series of five fuselages of various camber was tested on the wing

Strong electron correlations in cobalt valence tautomers

We have examined cobalt based valence tautomer molecules such as Co(SQ)$_2$(phen) using density functional theory (DFT) and variational configuration interaction (VCI) approaches based upon a model Hamiltonian. Our DFT results extend earlier work by finding a reduced total energy gap (order 0.6 eV) between high temperature and low temperature states when we fully relax the coordinates (relative to experimental ones). Futhermore we demonstrate that the charge transfer picture based upon formal valence arguments succeeds qualitatively while failing quantitatively due to strong covalency between the Co 3$d$ orbitals and ligand $p$ orbitals. With the VCI approach, we argue that the high temperature, high spin phase is strongly mixed valent, with about 30 % admixture of Co(III) into the predominantly Co(II) ground state. We confirm this mixed valence through a fit to the XANES spectra. Moreover, the strong electron correlations of the mixed valent phase provide an energy lowering of about 0.2-0.3 eV of the high temperature phase relative to the low temperature one. Finally, we use the domain model to account for the extraordinarily large entropy and enthalpy values associated with the transition.Comment: 10 pages, 4 figures, submitted to J. Chem. Phy

The finite element machine: An experiment in parallel processing

The finite element machine is a prototype computer designed to support parallel solutions to structural analysis problems. The hardware architecture and support software for the machine, initial solution algorithms and test applications, and preliminary results are described

Policy Implications Of The War In Iraq And Its Influence On The Global Market: A Public Affairs Perspective

United States coalition force invaded Iraq after months of failed negotiation with the United Nation Security Council and the Iraqi government.  Many of the nations that opposed the invasion were important trading partners with the U.S.  As such, global trade relationships have been damaged in the short run.  This paper examines the impact of Iraqi war on the global market economy.  The global market performance was sluggish in the weeks preceding the war and including the cessation of the war in Iraq.  This was due to uncertainty in the price of oil and the ultimate outcome of the war.  However, markets rebounded as oil prices normalized due to the quick overthrow of Baghdad.  Furthermore, the U.S. dollar had been steadily weakening against the Euro in the months preceding the war.  Therefore, a successful completion of the Iraq war will help prevent further devaluation of the dollar

Drugs Company Profits In The United States: Are They Excessive? Evidence From Public Administration Perspectives

Historically, the drug industry has been one of the most profitable in the United States of America and has been attributed to the relatively high cost of drugs compared to other developed countries. The call on drug companies to reduce the costs has increased tremendously with the industry strongly resisting, claiming costs are justified to support research and development of newer and better drugs. This debate is currently ongoing in the legislature with strong lobbying from both sides of the divide.  Hence, the main objective of this research is to determine the reasons for the high cost of prescription drugs in the United States compared to other countries and suggest ways to make drugs more affordable. The solution to the problem will most likely come from a compromise by both sides involving government funded research and production of generic drugs by companies. This would bring down the cost of drugs while ensuring continuation of research and development and guarantee reasonable profits for the drug industry

Impact Of Race, Ethnicity, And Immigration Policy: A Politico-Economic Perspective

Recent proposals for a comprehensive immigration bill in the Senate may be based on political expediency.  Sound bites about border security, worksite enforcement, and the status of about 12 million people who are currently in the United States illegally are salient issues to many politicians and various ethnic groups.  There are over 12 million immigrants who are in the United States illegally and the majority of them are from Mexico due to their connected borders, thus making it easier access.  The government wants to form new policies and laws to control the immigration to the United States. The House of Congress passed a bill that would make illegal immigration a criminal offense and would also make it a crime to help illegal immigrants migrate to the United States. For years now, the government has been trying to form new ways to improve immigration laws and assist illegal immigrants on gaining citizenship in the United States

Large deviations for many Brownian bridges with symmetrised initial-terminal condition

Consider a large system of $N$ Brownian motions in $\mathbb{R}^d$ with some non-degenerate initial measure on some fixed time interval $[0,\beta]$ with symmetrised initial-terminal condition. That is, for any $i$, the terminal location of the $i$-th motion is affixed to the initial point of the $\sigma(i)$-th motion, where $\sigma$ is a uniformly distributed random permutation of $1,...,N$. Such systems play an important role in quantum physics in the description of Boson systems at positive temperature $1/\beta$. In this paper, we describe the large-N behaviour of the empirical path measure (the mean of the Dirac measures in the $N$ paths) and of the mean of the normalised occupation measures of the $N$ motions in terms of large deviations principles. The rate functions are given as variational formulas involving certain entropies and Fenchel-Legendre transforms. Consequences are drawn for asymptotic independence statements and laws of large numbers. In the special case related to quantum physics, our rate function for the occupation measures turns out to be equal to the well-known Donsker-Varadhan rate function for the occupation measures of one motion in the limit of diverging time. This enables us to prove a simple formula for the large-N asymptotic of the symmetrised trace of ${\rm e}^{-\beta \mathcal{H}_N}$, where $\mathcal{H}_N$ is an $N$-particle Hamilton operator in a trap

STAR inner tracking upgrade - A performance study

Anisotropic flow measurements have demonstrated development of partonic collectivity in $200\mathrm{GeV}$ Au+Au collisions at RHIC. To understand the partonic EOS, thermalization must be addressed. Collective motion of heavy-flavor (c,b) quarks can be used to indicate the degree of thermalization of the light-flavor quarks (u,d,s). Measurement of heavy-flavor quark collectivity requires direct reconstruction of heavy-flavor hadrons in the low \pt region. Measurement of open charm spectra to high \pt can be used to investigate heavy-quark energy loss and medium properties. The Heavy Flavor Tracker (HFT), a proposed upgrade to the STAR experiment at midrapidity, will measure $v_{2}$ of open-charm hadrons to very low \pt by reconstructing their displaced decay vertices. The innermost part of the HFT is the PIXEL detector (made of two low mass monolithic active pixel sensor layers), which delivers a high precision position measurement close to the collision vertex. The Intermediate Silicon Tracker (IST), a 1-layer strip detector, is essential to improve hit identification in the PIXEL detector when running at full RHIC-II luminosity. Using a full GEANT simulation, open charm measurement capabilities of STAR with the HFT will be shown. Its performance in a broad \pt range will be demonstrated on $v_{2}$ (\pt > 0.5\mathrm{GeV}/c) and $R_\mathrm{CP}$ (\pt < 10\mathrm{GeV}/c) measurements of \D meson. Results of reconstruction of \Lc baryon in heavy-ion collisions are presented.Comment: to appear in EPJ C (Hot Quarks 2008 conference volume

On fluctuations of closed string tachyon solitons

We discuss fluctuations on solitons in the dilaton/graviton/tachyon system using the low energy effective field theory approach. It is shown that closed string solitons are free of tachyons in this approximation, regardless of the exact shape of the tachyon potential.Comment: 13 pages, 1 figure, uses JHEP3.cl