Faddeev treatment of long-range correlations and the one-hole spectral function of O16

The Faddeev technique is employed to study the influence of both particle-particle and particle-hole phonons on the one-hole spectral function of O16. Collective excitations are accounted for at a random phase approximation level and subsequently summed to all orders by the Faddeev equations to obtain the nucleon self-energy. An iterative procedure is applied to investigate the effects of the self-consistent inclusion of the fragmentation in the determination of the phonons and the corresponding self-energy. The present results indicate that the characteristics of hole fragmentation are related to the low-lying states of O16.Comment: 10 pages, 6 figures, 3 tables. Submitted to Phys.Rev.

Conditional quantum dynamics with several observers

We consider several observers who monitor different parts of the environment of a single quantum system and use their data to deduce its state. We derive a set of conditional stochastic master equations that describe the evolution of the density matrices each observer ascribes to the system under the Markov approximation, and show that this problem can be reduced to the case of a single "super-observer", who has access to all the acquired data. The key problem - consistency of the sets of data acquired by different observers - is then reduced to the probability that a given combination of data sets will be ever detected by the "super-observer". The resulting conditional master equations are applied to several physical examples: homodyne detection of phonons in quantum Brownian motion, photo-detection and homodyne detection of resonance fluorescence from a two-level atom. We introduce {\it relative purity} to quantify the correlations between the information about the system gathered by different observers from their measurements of the environment. We find that observers gain the most information about the state of the system and they agree the most about it when they measure the environment observables with eigenstates most closely correlated with the optimally predictable {\it pointer basis} of the system.Comment: Updated version: new title and contents. 22 pages, 8 figure

Report on Phase 2.3, Investigation of Welded Highway Bridges. Project IHR-64

The object of this investigation was to study the effect of internal flaws on the fatigue behavior of butt-welded connections in mild structural steel, the initiation of fatigue cracks from these flaws and the propagation rates of these cracks in the connections. Since internal flaws occur in many welds it is essential to obtain a better understanding of the behavior of flawed connections so that adequate, yet realistic, code requirements can be established. The study is limited to two major types of defects, porosity and incomplete penetration. The porosity was further subdivided into two categories based on the severity of the defect. The specimens with incomplete penetration were made with an initial 3/16" centrally located crack the full width of the- specimen. The fatigue behavior of the connections with the defects is compared with that of sound welds to observe the effects of the defects on the fatigue strength of the connections. The data are compared with result~ of similar studies found in the literature and also with the AASHO 1970 Specification design requirements. Three of the specimens with incomplete penetration were examined radiographically during the fatigue testing to determine when initiation of the fatigue cracks occurred, and how rapidly they propagated. The results of the crack propagation tests are compared with similar relationships developed for high strength steels. A relationship that better fits the data for mild steel has been developed in a manner similar to that used for the high strength steels.State of Illinois. Department of Transportation. Division of HighwaysU.S. Department of Transportation. Federal Highway Administratio

Monetary Misconceptions

The paper identifies a number of misconceptions about the monetary policy process and the monetary transmission mechanism in the UK. Among the misconceptions about the process are the alleged lack of regional and sectoral representativeness of the Monetary Policy Committee and the view that operational central bank independence means that monetary and fiscal policy are not properly coordinated. Among the transmission mechanism misconceptions, the "New Paradigm" figures prominently. Among the New Paradigm changes in the British economy that have been given prominence are the following: increasing openness; lower global inflation; lower profit margins, reflecting stronger competitive pressures; buoyant stock markets; a lower natural rate of unemployment; and a higher trend rate of growth of productivity. I argue that the New Paradigm has been over-hyped and misunderstood as regards its implications for monetary policy. Other misconceptions include the 'death of inflation', the 'end of boom and bust', a couple of Neanderthal Keynesian fallacies and the monetary fine tuning fallacy.Monetary policy, inflation targeting, New Paradigm, stabilisation policy

Strongly Regular Graphs with Maximal Energy

The energy of a graph is the sum of the absolute values of the eigenvalues of its adjacency matrix. Koolen and Moulton have proved that the energy of a graph on n vertices is at most n(1 + √n)/2, and that equality holds if and only if the graph is strongly regular with parameters (n, (n+√n)/2, (n+2√n)/4, (n+2√n)/4). Such graphs are equivalent to a certain type of Hadamard matrices. Here we survey constructions of these Hadamard matrices and the related strongly regular graphs.Graph energy;Strongly regular graph;Hadamard matrix.

Pigouvian pricing and stochastic evolutionary implementation

pricing;game theory

Fatigue Behavior of Welded Joints and Weldments in HY-80 Steel Subjected to Axial Loadings

Bureau of Ships, U.S. Navy.Contract N0bs 77137Index No. NS-021-20

Solar Orientation in Home Design

An introduction to solar orientation can be no more than a discussion of the physical principles underlying the subject. A few "solar houses" have been built, with apparently satisfactory results. The University of Illinois has not as yet investigated heating problems in houses of this type. Several points should be noted: A. Solar orientation may be applied to any kind of architectural design, but is best achieved in non-traditional types which permit the use of large glass areas, or groups of windows. B. "Glass areas" may be achieved, at varying costs, with ordinary windows, plate glass, or structural glass. Improvements in the manufactureof glass offer many possibilities of design. C. A "solar house" is not a "glass house," but is one in which glass areas are carefully placed, and protected from summer sun and winter storms. D. The professional advice of an arc hi teet is desirable in planning for solar orientation. An unskilled planner can make serious mistakes by using large glass areas in a manner which results in excessive heat loss. glare, or lack of privacy

Negative externalities and evolutionary implementation

game theory;externalities