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840 Matching Results
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840
A Comparative Analysis of the Liquid Metal Heat Transfer Systems for WMA
Introduction. As stated in Report KAPL 116, one of the objectives of the KAPL reactor is "to provide a prototype demonstration of the practical general of electrical power from Nuclear energy using molten sodium as the primary coolant. The reactor will generate steam at a temperature of 550 degrees F and 465 psia, including 90 degree superheat potentially capable of an efficiency of twenty-eight per cent in electrical output." The work reported here is intended to increase the scope and supply an independent check on the heat transfer system analysis that has previously been done. The purpose of these analyses is to investigate the effects on load rating and top reactor temperature.
Date:
April 29, 1949
Creator:
Selby, J. D.
Object Type:
Report
System:
The UNT Digital Library
Determination of Free Nitric Acid in UNH Solutions, Problem Assignment No. 208-X2A, Progress Report
Technical report abstract: Since UNH is a highly dissociated compound which ionizes to NO3 and (UO2), the latter ion being very weakly basic, a solution of pure UNH is quite acid (pH about 3). It is possible to titrate to a phenolphthalein and point with standard caustic solution and obtain a figure which represents the free acid plus the NO3 from the the UNH. However, titration of the free nitric acid alone in such a solution presents quite a problem. By precipitating and removing uranium from solution by means of potassium ferrocyanide, the residual free acid may be titrated directly by means of standard caustic using either methyl red or phenolphthalein indicators, with an error of less than 4%. A method is given to determine formic acid, should that acid be present in the mixture.
Date:
April 21, 1944
Creator:
Parlour, A. K. & Hammond, C. W.
Object Type:
Report
System:
The UNT Digital Library
Ames Project, Chemical Research - Analytical Chemistry, Report for Period of February 1 to March 10, 1944
Technical report covering (1) analysis of uranium bromide and chloride samples, (2) the ferric-nitrate method of analyzing uranium fluorides for fluorine, (3) spectrographic determination of boron, cadmium and manganese in magnesium metal, (4) service analyses. contributions to other problems, (5) attempted preparation of uranous oxyfluoride, and (6) corrections in previous reports.
Date:
April 13, 1944
Creator:
Spedding, F. H. (Frank Harold), 1902- & Wilholm, H. A.
Object Type:
Report
System:
The UNT Digital Library
The Precipitation of Lanthanum from Solution in the Presence of Radiation
Abstract. In order to anticipate radiation - chemical effects in solutions of active lanthanum, various solutions and suspensions containing lanthanum were irradiated with an electron beam. Separation of lanthanum from barium by the alcoholic HCl method is not rendered less efficient by radiation, although considerable gas evolution occurs. Suspensions of lanthanum as hydroxide and as ferrocyanide are not appreciably solubilized by radiation. Lanthanum oxalate is decomposed by radiation, is partially thrown into solution, and finally dissolves completely when all the excess oxalate ion in the solution has been destroyed.
Date:
April 6, 1945
Creator:
Penneman, R. A. (Robert Allen), 1919-; Ghormley, J. A.; Gordon, S.; Leaf, B. & Allen, A. O. (Augustine O.)
Object Type:
Report
System:
The UNT Digital Library
Interaction of Be with Fission Neutrons
To determine whether or not the (n,2n) reaction in Be would produce a net increase in fission neutrons in a power plant, the distribution of In resonance neutrons slowed down from fission energies in a graphite block was measured with and without a 2" of Be in front of a U3O8 slab undergoing fission. The thermal neutrons producing the fissions were obtained by slowing down neutrons from a cyclotron source. The observed distribution without Be was well represented by a Gaussian source range 36 cm. (corresponding to an initial fission energy of 3 MeV) and a similar sink of range 7.8 cm. The total In resonance intensity with Be was 5% less than without Be. On the assumption that the effect of the Be is entirely due to its different mean free path and moderating power, the In distribution with Be was calculated. Since the m.f.p. as a function of energy is not known for Be, two separate calculations were made using the highest (2.9 cm.) and the lowest (1.80 cm.) possible values for the effective Be m.f.p. Both calculated curves were found to be higher than the observed Be distribution, indicating that at least 10% of the fission neutrons …
Date:
April 29, 1942
Creator:
Borst, L.; Allison, S. K.; Wheeler, John Archibald, 1911-2008 & Weinberg, Alvin Martin, 1915-2006
Object Type:
Report
System:
The UNT Digital Library
Effect of Temperature on the Resonance Absorption of Neutrons by Uranium
The resonance absorption of uranium for neutrons has been investigated between 20 degree C and 1000 degree C. Experiments were caried out on both UO2, density 4.63, and metal. The resonance activity was measured with respect to that of an iodine monitor at several different temperatures and the ratio of activity at temperature T to that at 20 degree C was determined. The increase in activity is 0.9 per cent per 100 degree C for the oxide and 1.1 percent per 100 degree C for the metal. The period of U239 was found to be 23.54 +- 0.05 min.
Date:
April 22, 1943
Creator:
Mitchell, Allan C. G. (Allan Charles Gray), 1902-; Slotin, Louis; Marshall, John; Nedzel, V. A.; Brown, L. J. & Pruett, John R.
Object Type:
Report
System:
The UNT Digital Library
The Pile Safety Circuit
The present report is concerned with the electronic relay which, upon the reaching of a pre-determined value of ionization current in the associated chamber, actuates the safety rod release mechanism. The are here proposed two independent suggestions: (1) An improved trip circuit of such sensitivity and stability as to allow it to be actuated by a signal directly from the chamber without the necessity of interposing intermediate amplifier stages. The value of chamber current at which tripping occurs is stable to +- 0.4%. (2) A triple-wound relay to prevent shut-downs of the pile which would otherwise be caused by development of defects in the safety circuits.
Date:
April 14, 1944
Creator:
Nierman, Leonard G.
Object Type:
Report
System:
The UNT Digital Library
Calculation of the Temperature Distribution in a Slug With a Solid Aluminum Cap
Calculations were made to determine the temperature at various points of a thick disc and cap, on the assumptions that the heat production rate is uniform throughout the slug and that the slug is in perfect thermal contact with the cap. Results obtained by different methods of computation are compared with each other and with results obtained by Drew on the Paschkis electrical network computer at Columbia University.
Date:
April 14, 1944
Creator:
Murray, F. H.; Karush, William; Ginsburg, M. & Young, G.
Object Type:
Report
System:
The UNT Digital Library
Resonance Absorption in Lumps and Mixtures
The resonance absorption of a lump is described in terms of three components. Calculations of resonance absorption are carried out using the model for the resonance spectrum of uranium recently derived; calculations are also made with variations of this model which involve local fluctuations in level strengths. For metal and oxide lumps the agreement with observation is satisfactory. For dilute mixtures, whose resonance activation was measured by Mitchell, computed values fall 20% to 30% above measured ones.
Date:
April 17, 1944
Creator:
Dancoff, Sidney M., 1913-1951 & Gingburg, M.
Object Type:
Report
System:
The UNT Digital Library
The Influence of Operation on Tuballoy
An attempt is made to estimate the influence of operation upon the mechanical properties of tubealloy. It is to be emphasized that the work is highly speculative, being base upon a set of judicious assumptions regarding the transport material within the metal and should not be used as a substitute for a set of well-planned experiments. The two principal effects considered are the hardening which results from the atomic displacement produced by the fission fragments and the changes in mechanical properties arising from the presence of the fission products. The principal conclusion to be drawn is that the disruption of the metal which accompanies operation takes place at at sufficiently high rate that it could readily cause serious changes in the mechanical properties of the slups. the reversal of the disruption resulting from thermal effects probably is sufficiently high to prevent serious embrittlement as a consequence of displacement through most of the volume of the slug if not at the surface. On the other hand, the migration of atoms also appears to be sufficiently high that the rare gas products may have time to diffuse to cracks and produce embrittlement.
Date:
April 21, 1944
Creator:
Seitz, Frederick, 1911-2008
Object Type:
Report
System:
The UNT Digital Library
On the Boundary Condition Between Two Multiplying Media
The transition region between two parts of a pile which have different compositions is investigated. In the case where the moderator is the same in both parts of the pile, it is found that the diffusion constant times thermal neutron density plus diffusion constant times fast neutron density satisfied the use pile equations everywhere, right to the boundary. More complicated formulae apply in a more general case.
Date:
April 19, 1944
Creator:
Friedman, Francis L. (Francis Lee), 1918- & Wigner, Eugene Paul, 1902-1995
Object Type:
Report
System:
The UNT Digital Library
The Effect of Thermal Cycling on the Thermal Transfer from a Sand Blasted Slug to an Unbonded Jacket
Abstract. Measurements were made to determine the effect of thermal cycling on heat transfer from slug to jack using a slug with a sand blasted surface. The value of the transfer coefficient h decreased from initial values ranging from 10 to [formula], to values and [formula] after 1700 cycles, and to a range of 0.15 to 0.45 [formula] after 3200 cycles. Comparisons are made with the results found for slugs with different surfaces.
Date:
April 2, 1945
Creator:
Bentley, Robert R.
Object Type:
Report
System:
The UNT Digital Library
Solubility and Diffusion Constants for Gases
The solubility constants are presented for He , Kr , Xe , O2 , N2 , and air in H20 . Inter-diffusion constants for gases and the diffusion of gases in water are given.
Date:
April 9, 1945
Creator:
Schlegel, Richard
Object Type:
Report
System:
The UNT Digital Library
The Hall Effect in Neutron Irradiated and Annealed Graphite
Abstract. Irradiated Whiting graphite possesses a small negative or a positive Hall constant, depending upon the dosage. Annealing at 500 degrees C for 1 hour in helium results in a Hall constant which is large in magnitude and negative in sign. The properties of the annealed graphite are presumably close to those of the original unirradiated material. Unirradiated AGOT-K graphite has a large, negative Hall constant. A mechanism is suggested which accounts for the change in sign of the Hall constant as a result of neutron bombardment.
Date:
April 18, 1945
Creator:
Maurer, Robert J. & Ruder, Richard C.
Object Type:
Report
System:
The UNT Digital Library
Theory of Oscillating Absorber in a Chain Reacting Pile
Abstract. the fluctuation in pile intensity caused by an oscillating point absorber is calculation. It is found that the nature of the response depends on the frequency of the impressed oscillation. If the frequency is high compared to the decay rate of the high harmonics, the response consists of a wave which is propagated away from the oscillator. If the frequency is low, the propagated wave character of the response disappears and the intensity of the whole pile tends to oscillate with the same phase. The amplitude of the response decreases with increasing frequency.
Date:
April 6, 1945
Creator:
Cahn, Albert S., Jr.; Monk, A. T. & Weinberg, Alvin Martin, 1915-2006
Object Type:
Report
System:
The UNT Digital Library
Annual Report of the Boy Scouts of America: 1939
Annual report submitted by the Boy Scouts of America to Congress describing highlights from 1939, activities, finance, honors, service reports, organizational leadership, and other information about scouting programs.
Date:
April 1, 1940
Creator:
Boy Scouts of America
Object Type:
Report
System:
The Portal to Texas History
Texas Game and Fish, Volume 1, Number 5, April 1943
Monthly magazine discussing natural resources, parks, hunting and fishing, and other information related to the outdoors in Texas.
Date:
April 1943
Creator:
Texas. Game and Fish Commission.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Game and Fish, Volume 2, Number 5, April 1944
Monthly magazine discussing natural resources, parks, hunting and fishing, and other information related to the outdoors in Texas.
Date:
April 1944
Creator:
Texas. Game and Fish Commission.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Game and Fish, Volume 7, Number 5, April 1949
Monthly magazine discussing natural resources, parks, hunting and fishing, and other information related to the outdoors in Texas.
Date:
April 1949
Creator:
Texas. Game and Fish Commission.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Game and Fish, Volume 5, Number 5, April 1947
Monthly magazine discussing natural resources, parks, hunting and fishing, and other information related to the outdoors in Texas.
Date:
April 1947
Creator:
Texas. Game and Fish Commission.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Game and Fish, Volume 3, Number 5, April 1945
Monthly magazine discussing natural resources, parks, hunting and fishing, and other information related to the outdoors in Texas.
Date:
April 1945
Creator:
Texas. Game and Fish Commission.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Game and Fish, Volume 4, Number 5, April 1946
Monthly magazine discussing natural resources, parks, hunting and fishing, and other information related to the outdoors in Texas.
Date:
April 1946
Creator:
Texas. Game and Fish Commission.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Game and Fish, Volume 6, Number 5, April 1948
Monthly magazine discussing natural resources, parks, hunting and fishing, and other information related to the outdoors in Texas.
Date:
April 1948
Creator:
Texas. Game and Fish Commission.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Monthly Report of the Attorney General of the State of Texas, Volume 2, Number 3, March 1940
Monthly report documenting orders, opinions, and other legal statements issued by the Office of the Attorney General in Texas.
Date:
April 1940
Creator:
Texas. Attorney-General's Office.
Object Type:
Report
System:
The Portal to Texas History