Hyperfine Structure and the Depolarization of Resonance Radiation by a Magnetic Field

The depolarization of Sodium D line resonance radiation resulting from the Larmor precession of the excited atoms has been carefully determined by a photographic method. Results are compared with a former visual determination (Jour. Opt. Soc. 10, 427, 1925). The effect of hyperfine structure and especially of the degeneracy due to the finite breadth of adjacent hyperfine levels is discussed following Breit, Rev. Mod. Phys. 5: 91, 1933, especially Section 4, p. 117 ff

Polarization of Resonance Radiation and Breadth of Spectral Lines

Observations of the polarization of the D line resonance radiation of sodium indicate that the transition probabilities for the various components of the Zeeman pattern are substantially in agreement with the predictions of the so-called sum rule. Observations in relatively strong fields show the effect of non-uniform distribution of intensity in the exciting spectral line. The assumption that the distribution of energy in the exciting line is due practically entirely to Doppler effect leads to equations for the variation of polarization with field strength which are well verified experimentally. Any broadening of the line by collision or by a coupling effect is evidently quite small in comparison with the Doppler breadth

Theological Practices for Sustaining Community Renewal at Speedway Church of Christ

This project assembled a group of potential small-group facilitators for the purpose of drafting a small-group discussion guide to be used at the Speedway (Indiana) Church of Christ. The guide was intended to aid the discernment of missional practices which sustain the renewal of the wider community. Focusing on the Gospel of John, the intervention attempted to recover a temple Christology, construing the incarnation, ministry, death, and the lifting up of Jesus within the larger story of the temple’s ongoing re-creation of the world. In bestowing his glory upon the church, Jesus sends the church into all the world, as the Father had sent him, as a renewed temple and a mysterious agent of ongoing creation. Thus, the temple’s iconic creational functions, architecturally expressed on Zion and embodied in Jesus Christ, act as spiritual and imaginative sources for the church’s own practices of community renewal. The group sessions produced the discussion guide entitled The Temple and the Church’s Mission: A Discussion Guide for Discerning Missional Practices. This thesis assesses this artifact’s reliability and its wider theological significance for missional ecclesiology, suggesting further areas of research

Evidence of Energy Exchanges Accompanying Scattering of Atoms by Crystals

The distribution of mercury atoms scattered from NaCl KCl, KBr KI has been studied by means of an ionization gauge as a function of angle of incidence and temperatures of scatterer and incident beam. The direction of maximum intensify makes an angle with the crystal normal not equal to the angle of incidence but always slightly less

Construction of the New Pressure-Insulated Electrostatic Generator at the State University of Iowa (Abstract)

The electrostatic generator will be housed in a new underground laboratory connected to the physics building by a tunnel. Since last fall work has been proceeding on the construction of the generator inside of the 2½\u27 by 50\u27 steel tank. This pressure vessel will allow operation of the generator at pressures up to 8 atmospheres absolute. An intermediate electrode has been introduced. Two cotton fabric woven-endless belts with a linear speed of about 5,000\u27 per minute will charge the high potential electrode. The 22\u27 accelerating tube is being constructed of short porcelain sections with steel spinnings serving as accelerating electrodes

BIODYNAMIC DWELLING picking up the trailer trash

BIODYNAMIC DWELLING is a graduate design thesis which explores the current status of the “mobile home,” its ubiquity, and its history, ultimately seeking to innovate this commodified housing type. Millions of Americans reside in “mobile” residences of varying types, harbored in an environment which is neither healthy nor appropriate in a post-fossil fuel era where energy independence is paramount. As the most humane and personal of all built spaces, the dwelling affords the unique position to at once provoke, question, and inform the position of architecture within the realm of society. This proposal for a biodynamic dwelling—at once both bioclimatic and dynamic—suggests a living arrangement which rejects the current proliferation of stasis and homogeneity in housing, while embracing an adaptive, flexible alternative. The intention is that the dwelling, passive in existence and dynamic in nature, will support a deeper engagement with one’s living space, while also providing a greater cognizance of natural cycles

Angular Distribution of the Protons from the Deuteron - Deuteron Reaction

A collimated beam of deuterons, of accurately controlled energy, has been directed into a chamber filled with deuterium gas at a pressure of 0.5 mm. of Mercury. High Energy protons are produced in the well-known nuclear reaction: H2+H2→H1+H3. The number of such protons ejected per unit solid angle from disintegrations occurring in a selected volume has been measured as a function of angle with the incident beam. For a bombarding energy of 325 kilovolts we find the angular distribution to be represented by 1 + 1.35 cos2 ϑ, where ϑ is the angle with the beam as assigned by an observer at rest with respect to the center of mass of the colliding deuterons. The theoretical significance of the result will be discussed. Data for 250 and 400 kilovolts should also be available for presentation at the meeting

Velocity of Cadmium Atoms Regularly Reflected from a Rock Salt Crystal

We have previously shown that a beam of Cadmium atoms incident upon a cleavage face of a rock salt crystal is reflected so that the incident and reflected beams make equal angles with the normal to the crystal surface. At that time we suggested that this phenomenon could be interpreted in terms of the phase waves of de Broglie. The existence of a reflected beam making the same angle with the normal as does the incident beam suggests at once the possibility that we have here a situation in which the phase waves behave as X-rays do in the Bragg type of reflection

Gastric Tube Placement in Children 1-215 Months Old

poster abstractFeeding by a nasogastric/orogastric (NG/OG) tube is preferred when the gastrointestinal system is functional and the need for assisted feeding is expected to be short-term. Preliminary studies in children show that between 21% and 44% of these tubes are placed incorrectly. When tubes are out of place, children can be seriously harmed, causing increased morbidity and occasionally death. The aims of this study were to determine the best method to predict the insertion distance for placing NG/OG tubes and to determine the best clinical methods of testing the location of NG/OG tubes once they were inserted. A randomized clinical trial was conducted. The three insertion-distance prediction methods tested were nose-ear-xiphoid (NEX); nose-ear-mid-umbilicus (NEMU); and age-related, height-based (ARHB). An abdominal radiograph was obtained immediately following tube insertion to determine the internal location of the tube tip and orifice(s). Based on data from 95 children age 1-220 months (M = 51.8, SD = 54.9, median = 33.4), both the ARHB and NEMU methods were superior to NEX in placing the tube in the stomach (p = .0064). ARHB and NEMU were not significantly different from each other. NEX was frequently too short (41.93% of tube insertions) leaving the tube tip and/or orifices in the esophagus. The three clinical methods of testing tube location were CO2 monitoring and measuring pH and bilirubin in tube aspirate. Measuring pH of tube aspirate was the superior clinical method of determining tube location. Aspirate was available for testing in 84 children (88.42%). Based on a pH cutoff of 5 (recommended by Metheny in fasting adults), the sensitivity was 26.67 (low), specificity was 80.60 (high), positive predictive value was 23.53 (low), and negative predictive value was 83.08 (high). Measuring the NEX distance is the method most commonly used by nurses in practice; therefore, based on the results of this study and studies of other researchers, a practice change to either ARHB or NEMU should improve the safety of enteral feeding in children. Because of the low sensitivity in predicting misplaced tubes using pH, the superior clinical method, obtaining an abdominal x-ray to ensure placement in the stomach at the time of tube insertion is recommended

High Voltage Apparatus for Nuclear Physics

The design and performance of a transformer-rectifier voltage quadrupling installation for potentials up to 600 KV will be described