The Phase Structure of the Weakly Coupled Lattice Schwinger Model

The weak coupling expansion is applied to the single flavour Schwinger model with Wilson fermions on a symmetric toroidal lattice of finite extent. We develop a new analytic method which permits the expression of the partition function as a product of pure gauge expectation values whose zeroes are the Lee-Yang zeroes of the model. Application of standard finite-size scaling techniques to these zeroes recovers previous numerical results for the small and moderate lattice sizes to which those studies were restricted. Our techniques, employable for arbitrarily large lattices, reveal the absence of accumulation of these zeroes on the real hopping parameter axis at constant weak gauge coupling. The consequence of this previously unobserved behaviour is the absence of a zero fermion mass phase transition in the Schwinger model with single flavour Wilson fermions at constant weak gauge coupling.Comment: 8 pages, 2 figures, insert to figure 2 include

The Structure of the Aoki Phase at Weak Coupling

A new method to determine the phase diagram of certain lattice fermionic field theories in the weakly coupled regime is presented. This method involves a new type of weak coupling expansion which is multiplicative rather than additive in nature and allows perturbative calculation of partition function zeroes. Application of the method to the single flavour Gross-Neveu model gives a phase diagram consistent with the parity symmetry breaking scenario of Aoki and provides new quantitative information on the width of the Aoki phase in the weakly coupled sector.Comment: 9 pages, 1 figure (minor changes) To be published in Phys. Lett.

Will Geographical Indications Supply Excessive Quality?

Consumer/Household Economics, Marketing,

Weld peaking on heavy aluminum structures

Weld peaking is usually undesirable in any welded structure. In heavy structures, the forces involved in the welding process become very large and difficult to handle. With the shuttle's solid rocket booster, the weld peaking resulted in two major problems: (1) reduced mechanical properties across the weld joint, and (2) fit-up difficulties in subsequent assembly operation. Peaking from the weld shrinkage forces can be fairly well predicted in simple structures; however, in welding complicated assemblies, the amount of peaking is unpredictable because of unknown stresses from machining and forming, stresses induced by the fixturing, and stresses from welds in other parts of the assembly. When excessive peaking is encountered, it can be corrected using the shrinkage forces resulting from the welding process. Application of these forces is discussed in this report

AJAE Appendix: Optimal Investment in Transportation Infrastructure When Middlemen Have Market Power: A Developing-Country Analysis

The material contained herein is supplementary to the article named in the title and published in the American Journal of Agricultural Economics.Public Economics,

Selected reliability studies for the NERVA program

An investigation was made into certain methods of reliability analysis that are particularly suitable for complex mechanisms or systems in which there are many interactions. The methods developed were intended to assist in the design of such mechanisms, especially for analysis of failure sensitivity to parameter variations and for estimating reliability where extensive and meaningful life testing is not feasible. The system is modeled by a network of interconnected nodes. Each node is a state or mode of operation, or is an input or output node, and the branches are interactions. The network, with its probabilistic and time-dependent paths is also analyzed for reliability and failure modes by a Monte Carlo, computerized simulation of system performance

SWECS tower dynamics analysis methods and results

Several different tower dynamics analysis methods and computer codes were used to determine the natural frequencies and mode shapes of both guyed and freestanding wind turbine towers. These analysis methods are described and the results for two types of towers, a guyed tower and a freestanding tower, are shown. The advantages and disadvantages in the use of and the accuracy of each method are also described

A case for curriculum renewal: Deficiencies in the training of prospective auditors in a technology era

 The information revolution, where the evolution of technology has a pervasive impact on all aspects of life and business, is upon us. The private sector has embraced new technologies, presenting opportunities while also giving rise to new risks. Although slow to start, organisations (or audit clients – auditees) have started implementing specialist information technology (IT) governance frameworks to mitigate the risks attributable to IT. Just as organisations have changed, it is expected that external auditors (auditors), and their education and training, would also have adapted their audit approaches to account for the impact of evolving IT on auditees. This has not necessarily been the case. The standards do not provide the necessary detail guidance on IT required by auditors. The university curriculum as well as supplementary text have neither kept up to date with the rapid changes in technology or the changes in governance frameworks. The objective of this research was to perform a curriculum audit of the sufficiency of the auditing text (i.e. International Standards on Auditing (ISAs) and supporting guidances and textbooks as required by the competency framework) used in the audit specialisation of training prospective CAs (i.e. the curriculum relating to IT as part of the audit process) in ensuring graduates (i.e. future auditors) are relevant in an ever-evolving IT-driven environment The study found that although several areas of the audit curriculum are appropriate, there is in fact a gap within the current curriculum relating to IT internal controls and risks that exist at a technology level. The study calls for curriculum renewal within the audit specialisation, giving specific consideration to technology or operational-level controls within the framework of general and application IT internal controls taught.