Passive heat transfer control

Model maintains a preselected temperature in the near vicinity of a variable source of thermal energy. Heat input is controlled by a variable transformer and a voltage drop across the heater is used to calculate power dissipated

An investigation of the behavior of a passive heat transfer control device

Maintenance of predetermined temperature near variable source of thermal energy in relation to passive heat transfer control devic

Semiclassical theory of spectral line shapes. II. Applications to CO, HCl, and OCS, broadened by inert gases

The semiclassical theory of spectral line broadening developed in the previous paper of this series is used to calculate the half‐widths and shifts of nonoverlapping rotational spectral lines of CO, HCl, and OCS, broadened by inert gases. Comparisons are made with the available experimental data and with related theoretical analyses, and reasonable agreement is obtained. The method used applies both to fairly quantum systems as well as to the relatively classical ones. A symmetrized semiclassical expression for Wigner 6‐j symbols is given and applied

Influence of low and high pressure baroreceptors on plasma renin activity in humans

The effects of low and high pressure baroreceptors on plasma renin activity (immunoassay) were evaluated using graded lower body suction (LBS) in six healthy men. LBS at -10 and -20 mmHg for 10 min decreased central venous pressure without changing arterial pressure and thereby presumably reduced low but not high pressure baroreceptor inhibition of renin release. LBS at these levels produced forearm vasoconstriction, but did not increase renin. LBS at -40 mmHG decreased central venous and arterial pulse pressure and thus reduced both low and high pressure baroreceptor inhibition. LBS at this level produced forearm vasoconstriction and tachycardia and increased renin. In summary, reduction in low pressure baroreceptor inhibition in humans did not increase renin in the presence of physiological tonic inhibition from high pressure baroreceptors. Increases in renin did not occur until there was combined reduction of high and low pressure baroreceptor inhibition on plasma renin activity

The evolution of the genus triticum as an economic cereal

Citation: Fitz, L. A. The evolution of the genus triticum as an economic cereal. Senior thesis, Kansas State Agricultural College, 1902.Morse Department of Special CollectionsIntroduction: The study of our cereals is a most fascinating subject, and, apart from the intense interest which necessarily attaches to that cereal from whence comes our “staff of life”, the study of the history and development of the grain and of the operations necessary for its successful cultivation, the subsequent treatment in mill and bake-house, provides us with a series of intellectual problems of the highest interest. The peculiarities of the growth of the plant, the characteristics of the different types, the creation of new varieties, the unique chemical nature of the grain, the problems connected with soil and climate, the question of storing and transport, together with a study of the diseases and insect enemies that attack plant and grain, one and all furnish material sufficient for the study of a life-time. In treating such a broad subject I shall be able to touch in only the briefest possible manner the multitude of subjects herein presented for our study. The principal cereal belonging to the genus Triticum that we are especially interested in, and the one that will be most discussed here, is Triticum sativum vulgare, or wheat. This cereal is the principal grain food of civilized communities, and next to rice, the principal grain food of mankind. Its cultivation is of the very greatest antiquity, it being cultivated even in prehistoric times, as were also rice and barley. Spelt, which is a small grained variety of wheat, has been found in the lake-dwellings of Switzerland, human habitations which have been traced back to the stone age

Design and Characterization of Photoresponsive Supramolecular Aggregates

Supramolecular chemistry concerns the manner in which molecular building blocks associate via non-covalent interactions and form aggregates. The particular building block in this research is a photoresponsive molecule 4,4’-azobenzene dicarboxylic acid (ADA), a molecule that isomerizes reversibly around an N-N double bond upon irradiation with different wavelengths of light. The large structural changes in the molecule that result from isomerization have the potential to modulate the properties of a supramolecular aggregate. ADA was studied under a variety of environmental conditions for the purpose of understanding aggregation behavior and geometries. A UV-Vis and Circular Dichroism (CD) spectroscopic study of ADA showed that it is soluble only at very basic pH (above 10.8) and that a decrease in pH gives rise to the formation of an aggregate. Further studies of the self-aggregation process at low pH showed that this process is under hierarchical control. Four procedures for the formation of homo- or hetero-aggregates of ADA were characterized. Each gave rise to the formation of a different structure showing the importance of the pathway undertaken during the aggregation process. CD spectra of the ADA aggregates showed that, typically, they have a preferential asymmetric geometry despite the symmetry of the constituent molecules. Moreover, the use of a chiral template macromolecule (poly-glutamate) during the formation of the aggregate can affect the structure of the supramolecular species and direct its chirality. The study of the photoisomerization of ADA in the aggregated form showed that the highly packed aggregates of the trans isomer were unable to photoisomerize to the cis isomer upon UV (365 nm) irradiation. On the contrary the aggregates containing the cis isomer of ADA were able to retain their ability to photoisomerize to the aggregates of the trans form

The design and construction of an exposure meter for use with infrared sensitized film

In this project, an exposure meter which is sensitive to, and calibrated for infrared radiation was designed and constructed. An EG&G SGD-100A silicon photodiode was chosen to use as the photodetector. This choice was based on cost, availability, ruggedness, stability, and sensitivity. A circuit using an operational amplifier to amplify the output of the photodetector was used. The circuit design allowed easy variation of the signal gain to give a detectable meter deflection under varying lighting conditions. Five different gains were used to allow use of the meter under conditions ranging from outside under direct sunlight, to inside with typical room lighting. The gains used were empirically established. The film used was Kodak HIE 135-20. This is a black-and-white panchromatic emulsion with special sensitizing agents added to extend the film\u27s sensitivity into the near infrared to about 900 nanometers. The spectral response of the photodetector was to be filtered to match the spectral response of this infrared sensitized film. This proved not to be possible, due to the unavailability of any regular, stock filter which cuts off wavelengths above 900 nanometers. Despite this problem, the meter is much more accurate for setting exposures for the infrared sensitized film used than a normal exposure meter. The designed meter typically indicates within one stop of the optimum exposure for this film. A normal exposure meter reading made using Kodak\u27s exposure recommendations was incorrect by as much as three stops

Cabaret Story-Telling: Building Your Act

This thesis adduces the benefits in teaching undergraduate theatre majors the competency to create a cabaret. It expostulates that doing so during college gives students an advantage in marketing themselves professionally. It substantiates the general lack of cohesive undergraduate training in this area. The results of a survey of casting directors, assessing the worth of implementing the study of cabaret into theatre curricula, are incorporated. Those that responded agreed that performing cabarets can play a role in a performer’s career, even if the opinions varied as to what that specific role is. There was general agreement that the study of cabaret could benefit students in ways which potentially go beyond securing immediate employment. I have included a sample syllabus for a course focusing on the construction, and performance of a cabaret. It is anticipated this would serve for a performance class taught during a student’s fourth year of undergraduate study

Finite element models of wire rope for vibration analysis

The usefulness of wire rope in shock and vibration isolation is briefly reviewed and its modeling for the purpose of vibration analysis is addressed. A model of a nominally straight segment of wire rope is described in which the rope structure is represented by a maiden, or central, strand of wire with one (or more) strand(s) wrapped around it in a helix (helices). The individual strands are modeled using finite elements and MSC NASTRAN. Small linear segments of each wire are modeled mathematically by dividing them lengthwise into triangular prisms representing each prism by a solid NASTRAN element. To model pretensioning and allow for extraction of internal force information from the NASTRAN model, the wound strands are connected to the maiden strand and each other using spring (scalar elastic) elements. Mode shapes for a length of wire rope with one and fixed to a moving base and the other attached to a point mass, are presented. The use of the NASTRAN derived mode shapes to approximate internal normal forces in equations of motion for vibration analyses is considered

General Samora Yenus: Profile, Sudanese award, Expert comment

Unless otherwise indicated, all text posts are original productions of HornAffairs. If you copy and re-publish this post, you shall include a link to this page as well as a clear reference to HornAffairs and to the author.Sudanese President Al-Bashir honoured General Samora Yenus, the Chief of Staff of the Ethiopian National Defence Forces (ENDF), with the highest military medal, the Order of the two Niles. The former rebel commander, Samora, has been in charge of the army’s military commitment in the region and the continent for a decade and a half. According to the UK’s Professor Ann Fitz-Gerald, the Sudanese military medal award “has significance for Sudan, Ethiopia and the wider Horn of Africa region”