Bending stresses due to torsion in cantilever box beams

The paper beings with a brief discussion on the origin of the bending stresses in cantilever box beams under torsion. A critical survey of existing theory is followed by a summary of design formulas; this summary is based on the most complete solution published but omits all refinements considered unnecessary at the present state of development. Strain-gage tests made by NACA to obtained some experimental verification of the formulas are described next. Finally, the formulas are applied to a series of box beams previously static-tested by the U.S. Army Air Corps; the results show that the bending stresses due to torsion are responsible to a large extent for the free-edge type of failure frequently experienced in these tests

Remarks on the elastic axis of shell wings

The definitions of flexural center, torsional center, elastic center, and elastic axis are discussed. The calculation of elastic centers is dealt with in principle and a suggestion is made for the design of shear webs

A Summary of Design Formulas for Beams Having Thin Webs in Diagonal Tension

This report presents an explanation of the fundamental principles and a summary of the essential formulas for the design of diagonal-tension field beams, i.e. beams with very thin webs, as developed by Professor Wagner of Germany

Oregon's nutria problem

The nutria or coypu, Myocastor coypus, is a large semi-aquatic rodent that superficially resembles an overgrown muskrat or a stunted beaver. They were introduced into Oregon from about 1930 to the 1950's. At one time Oregon had more than 600 fur farmers raising these animals for fur; now there are none. Some animals escaped and many others were released into the wild when it became apparent that pelt values were nonexistent and production costs greatly exceeded profits. Being prolific and quite mobile, the nutria quickly spread through much of western Oregon. By the 1960's damage to agricultural crops was common to severe in western Oregon. Crops damaged included seed, grain, forage, hay and trees. Burrowing damage to stream banks, field borders, and farm ponds was reported in many areas. Growth and reproduction data for Oregon nutria are included. Methods for controlling feral nutria including the use of prolin, red squill, strychnine alkaloid, and zinc phosphide are reported. Fur trapping and adverse weather as factors in population reduction are discussed

A Critique of Adult Christian Education

Until a few years ago the age group known as young adults was a neglected area in Christian Education. Today there is an increased awareness and interest in the need for adequate young adult Christian Education in the local church. The distinctive mark of the American society is the young married couple and its family. A glance at the many advertisements shows that they are keyed to young adults. But the church, until very recently, has made little difference in the grading of adults. Because the interests and needs of adults are so widespread young adults often feel that there is nothing the church offers of vital interest to them. The writer has become aware that there is a lack of young adult Christian Education in many local churches. This area of need has been pointed up in nearly every course in the Christian Education department of Western Evangelical Seminary. Figures of the age of conversion have consistently indicated that few young adults become Christians. The problem of this study was to make an analytical and creative examination of adult Christian Education. The study was designed 1) to examine the related needs and interests of young adults; 2) to survey the development of adult Christian Education in America; 3) to make a critical analysis of current philosophies of Christian education; 4) to consider an evangelical philosophy of Christian Education relative to young adults; and 5) to propose a method and curriculum based upon the consideration of the philosophy for young adult Christian Education

Doubly Charmed Baryons in COMPASS

The search for doubly charmed baryons has been a topic for COMPASS from the beginning. Requiring however a complete spectrometer and highest possible trigger rates this measurement has been postponed. The scenario for such a measurement in the second phase of COMPASS is outlined here. First studies of triggering and simulation of the setup have been performed. New rate estimates based on recent measurements from SELEX at FNAL are presented.Comment: 13 pages, 15 figures, contribution to the Workshop on Future Physics at COMPASS, CERN, Geneva, September 26-27 2002, to appear as CERN Yellow Repor

Ultimate Stresses Developed by 24S-T Sheet in Incomplete Diagonal Tension

Tests were made on 18 shear panels of 24S-T aluminum alloy to verify the dependence of the ultimate stress on the degree of development of the diagonal-tension field. Tests were made on two thicknesses of sheet with the sheet either clamped between the flange angle or riveted to the outside of the angles