Flexible dielectric waveguides with powder cores

Flexible dielectric waveguides have been demonstrated at 10 GHz and 94 GHz using thin-wall polymer tubing filled with low-loss, high-dielectric-constant powders. Absorptive losses of the order of 10 dB/m were measured at 94 GHz. with nickel-aluminium titanate and barium tetratitanate powder in polytetrafluoroethylene (PTFE) lightweight electrical tubing. Bending losses at 94 GHz were negligible for curvature radii greater than 4 cm. M.H. Kuhn's (1974) theory of three-region cylindrical dielectric waveguide was used to calculate dispersion curves for the lower-order modes for several combinations of dimensions and dielectric constants. Good agreement was obtained between experimental and theoretical values of guide wavelength. A scheme is proposed for classifying hybrid modes of three-region guides based on the ratio |Ez/Hz|. For two-region guides, this reduces to E. Snitzer's (1961) familiar scheme

Review of the family Bochicidae : with new species and records (Arachnida: Pseudoscorpionida)

A history of the family is presented. All of the genera and species previously assigned to the family are reviewed, and 4 new species are described: Leucohya par va from Venezuela and Guyana, Mexobisium venii from Belize and Guatemala, M. dominicanum from the Dominican Republic, and Paravachonium sprousei from Mexico. Two subfamilies are established: Bochicinae (including the genera Antillobisium, Bochica, Troglobochica, Troglohya, and Vachonium) and Leucohyinae (including Apohya, Leucohya, Mexobisium, and Paravachonium)

Belgian-French relations during World War II: the perspective of a Congo Governor General

African Studies Center Working Paper No. 1

Case Note: Criminal Law - Parole - State Board of Parole Must Issue Statement of Reasons for Denial of Parole. United States ex rel. Johnson v. Chairman, New York State Board of Parole, 500 F.2d 925 (2d Cir. 1974)

This Case Note analyzes the Second Circuit\u27s decision in United States ex rel. Johnson v. Chairman, New York State Board of Parole, which held that due process considerations required the Board to issue a statement giving its reasons for denial of parole, both as a guide for the prisoner\u27s rehabilitative efforts and as an enduring record for possible appellate review

Four new species of Acoma Casey, with a key to species in the genus (Coleoptera: Scarabaeidae: Melolonthinae)

Acoma howdenorum, Acoma westcotti, Acoma quadrilaminata, and Acoma cimarron (Coleoptera: Scarabaeidae: Melolonthinae), all new species, are described from Yuma County, Arizona, USA, and Baja California Sur, Baja California (Norte), and Sonora, Mexico, respectively. Habitus of the four new species is illustrated, and an updated key to the described species in the genus is provided. Distribution and variation of Acoma glabrata Cazier are also discussed