Aperture coupling in bodies of revolution

A method for predicting the field penetrating a circumferential opening in a body of revolution is described here. This method employs the method of moments and an aperture equivalence theorem. The former permits rotationally symmetric cavities with otherwise arbitrary contours. The latter improves the sensitivity of field computation when the aperture height is tiny and/or points deep within the cavity are sought. This method is evaluated with comparison to classical theory and experiment via application to spherical and cylindrical cavities. Results for a missile-like cavity irradiated by an obliquely incident plane wave are given. A computer program and user manual is available.     

The new software documentation standard: Report on the joint logistic commanders joint policy coordinating group on computer resource management, computer software management subgroup, software workshop

Under the aegis of the Joint Logistics Commanders, the Computer Software Management Subgroup organized two workshops of combined industry and military personnel to review, revise, and recommend new standards for the acquisition and documentation of embedded computer systems. This paper describes the superset of documents which will be required under the new MIL-STD-SDS. The relationship of each document to the acquisition cycle, particularly the design reviews, and to each other, is emphasized.     

A simplified urea breath test for the diagnosis of Helicobacter pylori infection using the LARA System. Laser Assisted Ratio Analyzer

We report a schwannoma with a rare location at the tip of the nose in a 20-year-old woman with an otherwise unremarkable medical history. The imaging findings underline the usefulness of MRI in narrowing down the differential diagnosis of masses in this region. Once the diagnosis was focussed on a neural origin of the mass, the exact nature of the tumour could not be predicted from the MRI, although the presence of a capsule on imaging studies as well as at operation suggested it was probably a schwannoma. A schwannoma must be considered when one encounters a sharply delineated mass at the tip of the nose, showing high signal on T2-weighted images and strongly contrast enhancement.     

Absence of pancreatic duct dilation in chronic pancreatitis: surgical significance

Of 22 patients treated surgically for intractable pain from chronic alcoholic pancreatitis, eight did not show notable dilation of the main pancreatic duct by endoscopic retrograde cholangiopancreatography (ERCP), operative pancreatography, and/or operative and microscopical studies of the pancreas after subtotal pancreatectomy. In all patients, far advanced parenchymal pancreatitis was evident at operation and by microscopical study of the removed portion of the pancreas. These findings indicate that the basic problem in a considerable number of patients with symptomatic alcoholic chronic pancreatitis is not related primarily to obstruction with dilation of the major pancreatic duct, but to intrinsic changes in the parenchymal pancreas. The preoperative use of ERCP and individualization of operative procedures with a preference for subtotal or partial pancreatectomy for symptomatic chronic alcoholic pancreatitis are supported.     

Inhibition of Listeria monocytogenes in pH-adjusted pasteurized liquid whole egg

Although the transmission of L. monocytogenes to humans via pasteurized egg products has not been documented, L. monocytogenes and other Listeria species have been isolated from commercially broken raw liquid whole egg (LWE) in both the United States and Ireland. Recent Listeria thermal inactivation studies indicate that conventional minimal egg pasteurization processes would effect only a 2.1- to 2.7-order-of-magnitude inactivation of L. monocytogenes in LWE; thus, the margin of safety provided by conventional pasteurization processes is substantially smaller for L. monocytogenes than for Salmonella species (a 9-order-of-magnitude process). The objective of this study was to evaluate the inhibitory effects of nisin on the survival and growth of L. monocytogenes in refrigerated and pH-adjusted (pH 6.6 versus pH 7.5) ultrapasteurized LWE and in a liquid model system. The addition of nisin (1,000 IU/ml) to pH-adjusted ultrapasteurized LWE reduced L. monocytogenes populations by 1.6 to > 3.3 log CFU/ml and delayed (pH 7.5) or prevented (pH 6.6) the growth of the pathogen for 8 to 12 weeks at 4 and 10 degrees C. Bioactive nisin was detected in LWE at both pH values for 12 weeks at 4 degrees C. In subsequent experiments, Listeria reductions of > 3.0 log CFU/ml were achieved within 24 h in both LWE and broth plus nisin (500 IU/ml) at pH 6.6 but not at pH 7.5, and antilisterial activity was enhanced when nisin was added as a solution rather than in dry form.     

Precise visual modeling: A case-study

We develop an abstract model for our case-study: software to support a “video rental service.” This illustrates how a visual formalism, constraint diagrams, may be used in order to specify such systems precisely.     

Clinical features of five pedigrees genetically linked to the juvenile glaucoma locus on chromosome 1q21-q31

BACKGROUND: Primary juvenile glaucoma is a rare form of glaucoma that typically affects individuals between 3 and 20 years of ages and is inherited as an autosomal dominant trait. One gene responsible for this condition has been localized to the 1q21-q31 region of chromosome 1. To investigate the clinical features of this form of glaucoma, the authors have examined the affected members of five pedigrees demonstrating genetic linkage to the 1q21-q31 locus. METHODS: Clinical characterization of 23 affected patients was performed. Genetic linkage to the 1q21-q31 locus was confirmed by segregation of the disease trait in each pedigree with genetic markers located in the 1q21-q31 region. RESULTS: The clinical features of affected members of the five pedigrees presented are generally homogeneous. The average age of diagnosis was 18.5 years (range, 5-30 years), and the average initial intraocular pressure was 38.5 mmHg (range, 30-53 mmHg). Eighty-seven percent of affected individuals were myopic and 83% of affected individuals required surgical treatment for glaucoma. There were no uniformly associated systemic or ocular conditions. One possible nonpenetrant carrier was identified and a difference in phenotypic expression of the presumed disease gene was observed in a pair of affected monozygotic twins. We also identified two pedigrees with juvenile glaucoma and three pedigrees affected by the pigment dispersion syndrome that are not genetically linked to the 1q21-q31 region. CONCLUSION: The form of juvenile glaucoma caused by a gene located in the q21-q31 region of chromosome 1 is generally phenotypically homogeneous. The severe elevation of intraocular pressure typically seen in affected patients suggests the product of the predisposing gene may participate in the outflow function of the eye.