Light-Front QCD and the Constituent Quark Model

A general strategy is described for deriving a constituent approximation to QCD, inspired by the constituent quark model and based on light-front quantization. Some technical aspects of the approach are discussed, including a mechanism for obtaining a confining potential and ways in which spontaneous chiral symmetry breaking can be manifested. (Based on a talk presented by K.G. Wilson at ``Theory of Hadrons and Light-Front QCD,'' Polana Zgorzelisko, Poland, August 1994.)Comment: 14 pages, LaTeX, no figure

Why Are There Revisions to the Jobs Numbers?

At the beginning of each month, the Bureau of Labor Statistics (BLS) reports the change in payroll employment for the previous month. This estimate of jobs gained or lost over the month is closely watched by policymakers and those who work in financial markets and the media. When the estimate is revised in subsequent months, however, data users sometimes perceive a very different picture of the job market than what was initially reported. Data users frequently ask why the number was revised. The short answer is, the revised estimate includes additional information that was not available at the time of the initial release— information that makes the revised estimate more accurate. This BEYOND THE NUMBERS article explains the data collection process that BLS conducts every month to produce the estimate of U.S. employment. The article also should help clarify why BLS releases revisions to the initial estimate so that users will understand the change, if any, in the data

A study of large scale vertical motion in the atmosphere

The conclusions of the results obtained in this study are such that no method of computing vertical velocity here tried inspires any real confidence, when applied under realistic'field' conditions as they now exist in N.W.Europe i.e. radio-sonde ascents at a time interval of 12 hours (though on a moderately close network), and upper -air winds at 6-hour intervals and to the nearest ten degrees of arc.The study indicates that some at least of the methods based on the adiabatic assumption probably yield vertical motion patterns of reasonable , accuracy over restricted areas and at higher levels. Trial of kinematic and dynamic methods produced extremely erratic results in terms of what appeared to be the physical reality of the test situation. The results of the calculation of probable errors of computed values or of independent trials in a given situation are such as to hold out little hope of the successful application of these methods in the present 'field' conditions described. In addition, basic difficulties related to the scale of the movement involved in the study arose with both these methods

A transportation acquisition model for corn

The objectives of this thesis were: 1. To describe the movements of feed grains in Tennessee, 1959 and 1960. 2. To determine the cost of transporting corn into Tennessee from external supply centers, by method of carriage. 3. To relate these costs to the spatial arrangements of points of external origin and internal destination. 4. Construction of a least-cost transportation model for corn, using price and transportation cost differentials

Periodicity in Rank 2 Graph Algebras

Kumjian and Pask introduced an aperiodicity condition for higher rank graphs. We present a detailed analysis of when this occurs in certain rank 2 graphs. When the algebra is aperiodic, we give another proof of the simplicity of \ca(\Fth). The periodic C*-algebras are characterized, and it is shown that \ca(\Fth) \simeq \rC(\bT) \otimes \fA where \fA is a simple C*-algebra.Comment: 27 page

Honesty, social presence, and self-service in retail

Retail self-service checkouts (SCOs) can benefit consumers and retailers, providing control and autonomy to shoppers independent from staff. Recent research indicates that the lack of presence of staff may provide the opportunity for consumers to behave dishonestly. This study examined whether a social presence in the form of visual, humanlike SCO interface agents had an effect on dishonest user behaviour. Using a simulated SCO scenario, participants experienced various dilemmas in which they could financially benefit themselves undeservedly. We hypothesised that a humanlike social presence integrated within the checkout screen would receive more attention and result in fewer instances of dishonesty compared to a less humanlike agent. Our hypotheses were partially supported by the results. We conclude that companies adopting self-service technology may consider the implementation of social presence to support ethical consumer behaviour, but that more research is required to explore the mixed findings in the current study