Study of liquid slosh in the tracking and data relay satellite hydrazine tanks

An experimental study was conducted to provide data for evaluation of the parameters for an analytical mechanical model representation of liquid/interface dynamics in the TDRSS propellant tanks. Models were developed for two liquid-under ullage (forward tank) configurations and for one liquid-over-ullage (aft tank) configuration. However, additional test runs were conducted with liquids of different densities in both cases to allow separation of bladder stiffness and gravity effects under various simulated steady acceleration conditions. Both static and dynamic parameters are evaluated to provide a good prediction of observed results

Calibration of a gamma-ray telescope using tagged position annihilation photons

Measurements of detection efficiency, angular resolution, and energy resolution properties of a gamma ray telescope used to study celestial gamma rays from balloon flight altitudes are described. Nearly monochromatic photons produced at the National Bureau of Standards tagged photon facility were used for the calibration. Details of the photon beam configuration and properties and results of the measurements made at photon energies of 15.1 and 31.1 MeV are presented. Finally, the data are compared with a Monte Carlo analysis of the instrument properties

A simulation study of active feedback supression of dynamic response in helicopter rotor blades

A parameter study is presented for active feedback control applied to a helicopter rotor blade during forward flight. The study was performed on an electromechanical apparatus which included a mechanical model rotor blade and electronic analog simulation of interaction between blade deflections and aerodynamic loading. Blade response parameters were obtained for simulated vortex impinging at the blade tip at one pulse per revolution, and for a pulse which traveled from the blade tip toward its root. Results show that the response in a 1 - 10-per-rev frequency band is diminished by the feedback action, but at the same time responses at frequencies above 10-per-rev become increasingly more prominent with increased feedback amplitude, and can even lead to instability at certain levels. It appears that the latter behavior results from limitations of the laboratory simulation apparatus, rather than genuine potential behavior for a prototype helicopter

Fluid management technology: Liquid slosh dynamics and control

Flight experiments were defined for the Cryogenic On-Orbit Liquid Depot Storage, Acquisition and Transfer Satellite (COLD-SAT) test bed satellite and the Shuttle middeck to help establish the influence of the gravitational environment on liquid slosh dynamics and control. Several analytical and experimental studies were also conducted to support the experiments and to help understand the anticipated results. Both FLOW-3D and NASA-VOF3D computer codes were utilized to simulate low Bond number, small amplitude sloshing, for which the motions are dominated by surface forces; it was found that neither code provided a satisfactory simulation. Thus, a new analysis of low Bond number sloshing was formulated, using an integral minimization technique that will allow the assumptions made about surface physics phenomena to be modified easily when better knowledge becomes available from flight experiments. Several examples were computed by the innovative use of a finite-element structural code. An existing spherical-pendulum analogy of nonlinear, rotary sloshing was also modified for easier use and extended to low-gravity conditions. Laboratory experiments were conducted to determine the requirements for liquid-vapor interface sensors as a method of resolving liquid surface motions in flight experiments. The feasibility of measuring the small slosh forces anticipated in flight experiments was also investigated

Letter from J. D. Dodge to John Muir, 1862 Nov 2

Neosho, Nov. 2d, 1862. Friend Muir, I now proceed to answer your very welcome epistle, which was received some time since. I was glad to hear from you and that you had received the money. I am not teaching school this winter as I intended when out there, but I am in my Uncle\u27s store. I do not get quite as much money as I would teaching school, but I like the business better. We are having some quite cool weather here at present, it is snowing now quite hard There was quite a hard snow storm a few days since. How are you prospering with your studies? are you going to teach this winter? Where is Paton. I have not heard from him since I was there. They commence drafting in this State the 10th of this month. that is the report here. 264 to be drafted from this Co. 6 from this town There has a great many gone from this part of the country, and there are some who do not care whether many of them come back again or not. I have not enlisted, and do not think I shall very soon, but I may be drafted. I stand as good a chance asanyone. How are all of boys getting along there? Has the 29th regiment left there yet? Write what day they left if they have gone. My fingers are getting cold and stiff so I shall have to close. write soon, Good Bye, J. D. Dodge.P.S. I will send you Math- ewson\u27s address, perhaps you have it already. Eugene Mathewson, Co. A 1st N. Y. Artillery Albany Barracks Albany N.Y

Letter from J. D. Dodge to John Muir, 1862 Oct 1

[1] [Neosho?], Oct. 1st, 1862.Friend Muir, I now have an opportunity to write you a few lines, so I will make good my promise that I made when there. I started from Madison about 12 o\u27clock, got to Sun Prairie at daybreak; started from there at 6.15 arrived at Watertown at 8:15 sta\u27d there till about noon got home a little after dark. I like my watch well, but it stopped the next day after I got here, has not run any since shall like it better when it gets a running. I am going to town tomorrow, and I will get it fixed. If you can find that thing which [2] is gone out of the watch I wish you would be so kind as to send it to me. I will send that money by Express the same time that I put this in the P.O. Send me the note if you please in a letter. I do not know whether you can read this or not as I have not a very convenient place to write and it is so dark that I cannot see the rules on the paper. I expect to go to [Ocono?] nowoe] tomorrow, if I do I will send this, and the money. As soon as you read this consign it to purgatory, or some other place where no one will see it. Yours faithfully J. D. Dodge[3] write soon and let me know whether you get the money or not. 0030

Scandinavian Studies in the United States

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Unfettered Discretion: A Closer Look at the Board\u27s Discretion to Deny Institution

To ensure that the doorway to IPRs was not limitless, Congress de-lineated a specific threshold before a trial could be instituted. That threshold is set forth in 35 U.S.C. § 314(a), which provides that IPR may not be instituted unless the petition “shows that there is a reasonable likelihood that the petitioner would prevail with respect to at least 1 of the claims challenged in the petition.” However, the Board has increas-ingly identified circumstances in which it will not institute IPR, even where a petitioner satisfies this statutory threshold. Indeed, the Board has seemingly adopted the view that it has essentially unfettered dis-cretion to deny institution, separate and apart from the “reasonable likelihood” standard. As explained below, neither the text of Section 314(a) nor the legislative history of the AIA appears to support the Board’s view; moreover, this interpretation may be hindering Congress’ intent to provide an effective administrative alternative to litigation on the issue of patent validity

KINETOCHORES ASSOCIATED WITH THE NUCLEAR ENVELOPE IN THE MITOSIS OF A DINOFLAGELLATE

This is the publisher's version, also available electronically from "http://jcb.rupress.org".No abstract availabl