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Three-dimensional Numerical Investigation of Electron Transport with Rotating Spoke in a Cylindrical Anode Layer Hall Plasma Accelerator

Description: The oscillation behavior described in [Tang et. al, Phys. Plasmas 19, 073519 (2012)] di ers too greatly from previous experimental and numerical studies to claim observation of the same phenomenon. Most signi cantly, the rotation velocity in [Tang et. al, Phys. Plasmas 19, 073519 (2012)] is three orders of magnitude larger than that of typical \rotating spoke" phenomena. Several physical and numerical considerations are presented to more accurately understand the numerical results of [Tang et. al, Phys. Plasmas 19, 073519 (2012)] in light of previous studies.
Date: August 27, 1012
Creator: Ellison, C. Leland; Matyash, K.; Parker, J. B.; Raitses, Y. & Fisch, N. J.
Partner: UNT Libraries Government Documents Department

Revision of the Jumping Mice of the Genus Zapus

Description: Revision of genus Zapus based upon a study of more than 900 specimens, including nomenclature and skull and teeth figures.
Date: August 8, 1899
Creator: Preble, Edward A.
Partner: UNT Libraries Government Documents Department

Revision of the Skunks of the Genus Chincha

Description: From introduction: "Classification changes to skunks of genus Chincha in order to clear up confusion resulting from previous attempts at classification."
Date: August 31, 1901
Creator: Howell, Arthur H.
Partner: UNT Libraries Government Documents Department

The Rabbits of North America

Description: From introduction: "Revision to include all known hares and rabbits of North America from Isthmus of Panama to north Greenland."
Date: August 31, 1909
Creator: Nelson, E. W.
Partner: UNT Libraries Government Documents Department

A Biological Survey of Colorado

Description: From introduction: "Report based chiefly on the field work prosecuted during 1905, 1906, 1907, and 1909. It is primarily a characterization of the several major distribution areas or life zones."
Date: August 17, 1911
Creator: Cary, Merritt
Partner: UNT Libraries Government Documents Department

Notes on the Use of Low-Grade Fuel in Europe

Description: Technical paper issued by the Bureau of Mines over studies of low-grade fuel use in Europe. The results of the studies are presented and discussed. This paper includes tables, and illustrations.
Date: August 1915
Creator: Fernald, R. H.
Partner: UNT Libraries Government Documents Department

Some Engineering Problems of the Panama Canal in Their Relation to Geology and Topography

Description: Report issued by the Bureau of Mines over issues encountered during construction of the Panama Canal. As stated in the introduction, "this report aims to discuss, from the viewpoint of the mining geologist, the bearing of topographic and geologic conditions on certain problems that arose in the construction of the Panama Canal" (p. 7). This report includes tables, maps, illustrations, and photographs.
Date: August 1915
Creator: MacDonald, Donald F.
Partner: UNT Libraries Government Documents Department

Relative Worth of Improvements of Fabrics

Description: Report presents an equation that connects all the major qualities of a fabric, from which the fabric may be rigidly designed with respect to maximum ultimate economy.
Date: August 17, 1915
Creator: Goodyear Tire And Rubber Company
Partner: UNT Libraries Government Documents Department

Experiment Stations of the Bureau of Mines

Description: Report issued by the Bureau of Mines over the eleven experiment stations established near important mining fields. The work done by the stations are discussed. This report includes tables, illustrations, and photographs.
Date: August 1919
Creator: Manning, Van. H.
Partner: UNT Libraries Government Documents Department

Explosives and Miscellaneous Investigations

Description: Report discussing explosives research requested by the U.S. Army and Navy and conducted by the Bureau of Mines.
Date: August 1919
Creator: Manning, Van. H.
Partner: UNT Libraries Government Documents Department

Increase in Maximum Pressures Produced by Preignition in Internal Combustion Engines

Description: Report discusses the calculations that can be used to show why pressures inside an engine during preignition are higher than average. This information can be used to design a safer engine that is able to contain the increased pressure and heat generated during preignition.
Date: August 1920
Creator: Sparrow, S. W.
Partner: UNT Libraries Government Documents Department

The Problem of the Turbo-Compressor

Description: "In terminating the study of the adaptation of the engine to the airplane, we will examine the problem of the turbo-compressor, the first realization of which dates from the war; this will form an addition to the indications already given on supercharging at various altitudes. This subject is of great importance for the application of the turbo-compressor worked by the exhaust gases. Assuming that the increase of pressure in the admission manifold is the same in both cases, the pressure in the exhaust manifold would be greater in the case in which the compressor is worked by the exhaust gas and there would result a certain reduction of engine power which we must be able to calculate" (p. 1).
Date: August 1920
Creator: Devillers, René
Partner: UNT Libraries Government Documents Department

Soaring Flight in Guinea

Description: Report discusses information obtained from studying large birds that fly by soaring, which involves using the wind without moving their wings. An Egyptian vulture and African white-backed vulture were observed and their relative air speed, upward air velocity, lift, and drag were noted. The experimental methods for measuring these values are described.
Date: August 1920
Creator: Idrac, Pierre
Partner: UNT Libraries Government Documents Department

Theory of Lifting Surfaces, Part 2

Description: A mathematical model is presented towards a theory of lifting and resistance on wings. It consists hide of a theory of multiplanes, conditions of flow at a great distance from the wing, lifting systems of minimum resistance, and free stream and stream limited by walls.
Date: August 1920
Creator: Prandtl, L.
Partner: UNT Libraries Government Documents Department

Calculation of Wing Spars

Description: A simplified formula for calculating wing spars is presented.
Date: August 1921
Creator: Ratzersdorfer, Julius
Partner: UNT Libraries Government Documents Department

Calculation of Wing Spars

Description: The author presents a comparison and combination of the numerical and geometrical determinations of the maximum M, when calculating the maximum bay moment.
Date: August 1921
Creator: Müller-Breslau, H.
Partner: UNT Libraries Government Documents Department

Calculation of Wing Spars

Description: The author presents a comparison and combination of the numerical and geometrical determinations of the maximum M, when calculating the maximum bay moment.
Date: August 1921
Creator: Müller-Breslau, H.
Partner: UNT Libraries Government Documents Department

The Employment of Airships for the Transport of Passengers: Indications on the Maximum Limits of Their Useful Load, Distance Covered, Altitude and Speed

Description: It was a conclusion of this detailed study of the practicality of using airships for carrying passengers that, although slow, airships are capable of carrying useful loads over long distances. However, it is noted that there is a certain limit to the advantages of large cubature. Beyond a certain point, the maximum altitude of the airship goes on decreasing, in spite of the fact that the range of action in the horizontal plane and the useful load go on increasing. The possibility of rapid climb is an essential factor of security in aerial navigation in the case of storms, as is velocity.
Date: August 1921
Creator: Nobile, Umberto
Partner: UNT Libraries Government Documents Department

Gas Masks for Gases Met in Fighting Fires

Description: Technical paper issued by the Bureau of Mines over the development of gas masks designed for fighting fires. The characteristics of the different types of masks in development are presented. This paper includes tables, illustrations, and photographs.
Date: August 1921
Creator: Fieldner, Arno Carl; Katz, Sidney H. & Kinney, Selwyne P.
Partner: UNT Libraries Government Documents Department

High Efficiency of Seaplanes

Description: A table is presented which includes data for calculating the index of efficiency. The author uses this data to conclude that seaplanes cannot be considered inferior to terrestrial airplanes.
Date: August 1921
Creator: Pegna, G.
Partner: UNT Libraries Government Documents Department

Large German airship stations

Description: "It is profitable to examine the organization and equipment of the German airship stations. The stations best adapted for serving as the basis of this study were chiefly constructed by the German Navy, during the war, for exclusively military purposes and do not therefore entirely satisfy the conditions of exploitation required for a civilian air service. The requisite modifications for satisfying the latter conditions may nevertheless be readily determined according to circumstances" (p. 1).
Date: August 1921
Creator: Sabatier, J.
Partner: UNT Libraries Government Documents Department

A New Method of Testing in Wind Tunnels

Description: Now, in existing wind tunnels, using a horsepower of 100 to 300, the models are generally made to a 1/10 scale and the speed is appreciably lower than the speeds currently attained by airplanes. The Reynolds number realized is thus 15 to 25 times smaller than that reached by airplanes in free flight, while the ratio of speed to the velocity of sound is between a third and three quarters of the true ratio. The necessary increases in either the diameter of the wind tunnel or the velocity of the airstream are too costly.
Date: August 1921
Creator: Margoulis, W.
Partner: UNT Libraries Government Documents Department

Problem of Landing

Description: The author discusses various aspects of landing aircraft such as the actual process of touchdown and the problems associated with the tail skid touching the ground before the landing gear.
Date: August 1921
Creator: Pistolesi, E.
Partner: UNT Libraries Government Documents Department

Shape and Strength of Seaplane Under-Structures With Special Regard to Seaworthiness

Description: This report presents experiments and calculations for the purpose of determining the landing gear requirements upon the water. Moving pictures are given which furnish data and also may give both the magnitude and direction of the forces acting. Different classes of seaplanes are examined and proposals for calculation instructions are given.
Date: August 1921
Creator: Lewe, Victor
Partner: UNT Libraries Government Documents Department