A SYSTEMS APPROACH TO FROZEN FOODS MERCHANDISING

Agribusiness,

Extended Self-Similarity in Turbulent Systems: an Analytically Soluble Example

In turbulent flows the $n$'th order structure functions $S_n(R)$ scale like $R^{\zeta_n}$ when $R$ is in the "inertial range". Extended Self-Similarity refers to the substantial increase in the range of power law behaviour of $S_n(R)$ when they are plotted as a function of $S_2(R)$ or $S_3(R)$. In this Letter we demonstrate this phenomenon analytically in the context of the ``multiscaling" turbulent advection of a passive scalar. This model gives rise to a series of differential equations for the structure functions $S_n(R)$ which can be solved and shown to exhibit extended self similarity. The phenomenon is understood by comparing the equations for $S_n(R)$ to those for $S_n(S_2)$.Comment: Phys. Rev. Lett., submitted, RevTeX, 4 pages, two figures by request from Daniel Segel: [email protected]

Neutrino Energy Loss from the Plasma Process at all Temperatures and Densities

We present a unified approach which is accurate at all temperatures and densities for calculating the energy loss from a stellar plasma due to the plasma process, the decay of photons and plasmons into neutrino pairs. To allow efficient numerical calculations, an analytic approximation to the dispersion equations for photons and plasmons is developed. It is correct to order $\alpha$ in the classical, degenerate, and relativistic limits for all momenta $k$ and is correct at small $k$ for all temperatures and electron densities. Within the same approximations, concise expressions are derived for the transverse, longitudinal, and axial vector components of the neutrino emissivity.Comment: Latex, 30 pages. (2 figures available upon request). NUHEP-TH-93-

Building Solutions: Opportunities for Coloradans to Save Energy and Money Through Efficient Home Heating

Proposes ways to improve home heating efficiency to reduce energy use and costs, describes the expected economic benefits to the state, and makes policy recommendations for raising efficiency standards and expanding weatherization assistance programs

Hepatic artery thrombosis after liver transplantation: Radiologic evaluation

Hepatic artery thrombosis after liver transplantation is a devastating event requiring emergency retransplantation in most patients. Early clinical signs are often nonspecific. Before duplex sonography (combined real-time and pulsed Doppler) capability was acquired in October 1984, 76% of all transplants in this institution referred for angiography with a clinical suspicion of hepatic artery thrombosis had patent arteries. In an effort to reduce the number of negative angiograms, CT, real-time sonography, and pulsed Doppler have been evaluated as screening examinations to determine which patients need angiography. Of 14 patients with focal inhomogeneity of the liver architecture detected by CT and/or real-time sonography, 12 (86%) had hepatic artery thrombosis, one had slow arterial flow with hepatic necrosis, and one had a biloma with a patent hepatic artery. In 29 patients undergoing duplex sonography of the hepatic artery, six (21%) had absence of a Doppler arterial pulse. All six had abnormal angiograms: Four had thrombosis, one had a significant stenosis, and one had slow flow with biopsy-proven ischemia. Of 23 patients with a Doppler pulse, two had hepatic artery thrombosis at surgery. However, real-time sonography demonstrated focal inhomogeneity in the liver in both cases. Our data demonstrate that pulsed Doppler of the hepatic artery combined with real-time sonography of the liver parenchyma currently is the optimal screening test for selecting patients who require hepatic angiography after liver transplantation. A diagnostic algorithm is provided

Experimentar y codificar: consecuencias simbólicas del artefacto tecnológico

The purpose of this paper is to point out to some theoretical keys related to the techno-social rationality of the Knowledge Society. It is possible to say, in sociological terms, that our societies are changing from abstraction and split of information to a new settlement of the analogical over the digital ground. The challenge is not the study of technological influences over society, but the cultural and social forms of communication that emerge from the use of ICTs. The ideas are linked to the analysis of social complexity and informational theory, especially the quality of the environment that surrounds materiality that gives “support” to information. In other words, we are approaching the ground of symbolic structure, whose main axes are the use, circulation and experimentation with information.El presente artículo tiene como objetivo señalar algunas claves teóricas sobre la racionalidad tecno-social de la sociedad del conocimiento. En términos sociológicos se puede plantear que nuestras sociedades están experimentando el paso de una separación y abstracción de la información a un repoblamiento analógico del cálculo digital. El desafío en tales circunstancias no es tanto el estudio clásico del impacto de la tecnología en la sociedad, sino las figuraciones sociales y culturales que adquiere la información y el conocimiento que se producen por el uso de las TICs. Las ideas que se desprenden de las experiencias investigativas presentadas, se relacionan con la teoría de la información y el análisis de complejidad social, específicamente a la cualidad en torno a la materialidad que “soporta” tal información. En otras palabras, nos adentramos al ámbito de la estructuración simbólica social, cuyos principales ejes son el uso, la circulación y la experimentación con la información

Thermoconvection in magnetized ferrofluids: the influence of boundaries with finite heat conductivity

Realistic boundaries of finite heat conductivity Realistic boundaries of finite heat conductivity for thermoconvection in a Rayleigh-B\'enard setup with magnetized ferrofluids are investigated. A linear stability analysis of the conductive state is performed with a shooting method. It shows that the critical wave number is for any magnetic field stronly influenced by the conductivity of the boundaries. Linear as well as nonlinear coefficients of a Ginzburg Landau amplitude equation for convection shortly above the onset are evaluated as functions of the magnetic Rayleigh number, the boundary conductivities, and the fluid Prandtl number.Comment: 10 pages, 9figure

Coarse graining of master equations with fast and slow states

We propose a general method for simplifying master equations by eliminating from the description rapidly evolving states. The physical recipe we impose is the suppression of these states and a renormalization of the rates of all the surviving states. In some cases, this decimation procedure can be analytically carried out and is consistent with other analytical approaches, like in the problem of the random walk in a double-well potential. We discuss the application of our method to nontrivial examples: diffusion in a lattice with defects and a model of an enzymatic reaction outside the steady state regime.Comment: 9 pages, 9 figures, final version (new subsection and many minor improvements