Propagation measurements due to rain and ice using the OTS satellite over the period January 1979–May 1980

In this paper, we summarize propagation measurements along a slant path to the Orbital Test Satellite, OTS. Measurements were made using the circularly polarized beacon at 11.786 GHz. We present possible explanations for some of the measured propagation activity using a theoretical model incorporating rain, ice and a segmented rain and ice path. We also discuss measurements made with two electric field probes. Lastly the effect of a rain event on a glass-fibre radorne is illustrated and compared to the same event received via a co-located radome-less antenna.     

Anodischer Schutz von Titan in der Rayon-Industrie

Anodic protection ot titanium in the rayon industry A shell and tube exchanger of Ti for preheating spinning baths (47 to 75°C) is operating under an anodic protection potential of 10 to 15 V during two years' operation no measurable thinning has been found. In this connection it is important to prevent crevice corrosion, either by suitable design or by using a tube plate of Ti with 0,2% Pd. Proto-types of exchangers have been used to establish the throwing power of electrodes mounted at different points in the equipment.     

Health promotion—science or ideology?

Challenges health psychologists to be wary of becoming zealots in health promotion activities without continuing to recognize that health promotion programs should be anchored in sound science. Cholesterol control programs and the "Say No to Drugs" campaign are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Solving non-linear elliptic difference equations by extendable sparse factorization procedures

New extendable LU sparse factorization procedures are presented for the solution of non-linear elliptic difference equations. The derived iterative methods are shown to be both competitive and computationally efficient in comparison with existing schemes. Application of the methods on non-linear elliptic boundary value problems both in two and three space dimensions are discussed and numerical results are given.     

Dynamic illustrative graphics for simulations

In any graphics application, the environment created by the system designer is of utmost importance. A variety of good input devices, effective real time displays, ease of interaction with graphical elements and with system instructions can all contribute to a friendly environment. A graphics system designed for simulations with a facility for adding both abstract dynamic graphics and user control is enhanced by the addition of features uncommon to other graphics systems. These features, and their values and the ways in which they contrast with more traditional graphics systems, will be described.     

Iterative methods of solution for the elliptic fourth boundary value problem

A special form of the elliptic fourth boundary value problem has been investigated by Hockney (1965). The techniques used, however, are valid only for a Laplacian operator on a square mesh. In this paper, a more general solution process is introduced for a wide range of problems.     

Electron velocity in n GaAs at high electric fields

The velocity of electrons in n GaAs has been measured for electric fields in the range 20?55 kV/cm by the time-of-flight technique. The velocity was found to decrease slowly wlth increasing electric field, and is 8.09×106 cm/s at 55 kV/cm.     

Differential quantitation of surface and subsurface bacteria of normal skin by the combined use of the cotton swab and the scrub methods

By testing adjacent sites on the hypothenar eminence of the palm, enriched with bacteria by massaging the forehead, we found that the numbers of bacteria recovered from the skin surface by a wet cotton swab in 30 s were not significantly different from the numbers obtained by a brisk scrubbing with a blunted Teflon policeman for 120 s. This was true of aerobes (gram-positive cocci) and anaerobes (propionibacteria). If the same site on the palm was swabbed two times for 15 s each time, 67 to 94% of the total recovered bacteria were obtained on the first swab. Differential localization of bacteria into surface and subsurface populations was accomplished by first swabbing a test skin site to assay the surface flora and then scrubbing the same site to test for subsurface organisms. On the palm the swab yielded more aerobes and anaerobes than did the subsequent scrub. On the forehead the scrub yielded three to eight times as many anaerobes as the preceding swab. In some tests gram-positive cocci were distributed on the forehead like propionibacteria (large excess in scrub specimen); in other tests their numbers were similar in the swab and scrub specimens or there was a large excess in the swab specimen. These results indicate that there was no substantial subsurface flora on the palm. On the forehead propionibacteria were predominantly in deeper locations in all tests; gram-positive cocci were variable: in some test sites they were largely at the surface, whereas at other sites a predominance of cocci was in subsurface locations.     

The maternal and fetal levels of human chorionic gonadotropin, human placental lactogen and prolactin during the perinatal period (author's transl)

The levels of human chorionic gonadotropin (HCG), human placental lactogen (human choriosomatomamotropin HCS) and prolactin (PRL) were determined in the serum of 72 maternity patients and the serum of the newborn infants. The determinations were done with radioimmunologic tests (RIA). These three protein hormones were also determined in the amniotic fluid and in the maternal serum from 4-6 days prior to the delivery of the infant. The concentration of HCG or HCS in the serum of the newborn infants was a mean 0.43 or 0.37% of the level in the maternal serum. The concentration of PRL in the serum of the newborn was 118% and slightly higher than in the serum of the mothers. The concentration in the amniotic fluid was 1.5% for HCG, 5.8% for HCS, and 252% for PRL, compared to the corresponding levels in the maternal serum. The fact that the hormone concentrations in the amniotic fluid are significantly higher than in the serum of the newborn suggests excretion of the hormones from the fetal circulation via the fetal liver and the fetal kidney. The high levels of PRL in the maternal and the newborn serum may be caused by the high concentrations of estrogen or progesterone. Increased during the course of the pregnancy there was a significant sex linked difference in the level of HCG in the maternal serum correlated to the sex of the newborn infant.