SNAP-8 refractory boiler development. Topical report 3 - Evaluation of SNAP-8, SN-1 boiler

Performance tests of SNAP-8 boile

Evaluation of cermet materials suitable for lithium lubricated thrust bearings for high temperature operation

Cerment materials (HfC - 10 wt% W; HfC - 10 wt% TaC - 10 wt%W; HfC - 2 wt% CbC - 8 wt% Mo;Hfn - 10 wt% W; Hfn - 10 wt% TaN - 10 wt% W; and ZrC - 17 wt% W) were evaluated for possible use as lithium-lubricated bearings in the control system of a nuclear reactor. Tests of compatibility with lithium were made in T-111 (Ta-8W-2Hf) capsules at temperatures up to 1090 C. The tendencies of HfC-TaC-W, HfC-CbC-Mo, and HfN-W to bond to themselves and to the refractory alloys T-111 and TZM when enclosed in lithium-filled capsules under a pressure of 2000 psi at 980 and 1200 C for 1933 hours were evaluated. Thermal expansion characteristics were determined for the same three materials from room temperature to 1200 C. On the basis of these tests, HfC-10 TaC-10W and HfN-10W were selected as the best and second best candidates, respectively, of the materials tested for the bearing application

Compatibility of columbium base alloys with lithium fluoride

Thermal cycling tests of lithium fluoride compatibility with columbium base alloy

Analysis of Scheduling Policies for a M/G/I Queue with Rework

This thesis analyzes a multi-class M/G/1 priority queueing system in which distinct job types require one service cycle and, with non-zero probability, require a second service cycle. The main objective is to find a new heuristic scheduling policy that minimizes the long-run expected holding and preemption costs. Arrival rates, service rates, and the probability of undertaking second service are all class specific. A mean value analysis (MVA) approach was employed to derive the long- run mean time in queue for each job type under each policy, thereby providing the appropriate cost equations. Numerical experiments suggest that the preemptive resume scheduling policy yields the lowest cost most frequently

A Method For the Determination of Chloric Acid

In the methods for the determination of chloric acid by reduction, metallic zinc in some form and ferrous sulphate have been the reducing agents most used, though sulphur dioxide and formaldehyde have also been employed. The conditions under which the two former reducing agents have been used have been much varied. Thus Thorpe and Eccles used the zinc-copper couple, and determined with a solution of silver the chloride formed from the chlorate. Bothamley and Thompson showed that the results by this method were too low unless sulphuric acid was added near the end of the reduction to dissolve any basic salts of zinc. By the same method Becker found the results too low and preferred to use zinc dust and a little copper sulphate. Fleissner § used zinc dust and boiled the neutral solution one hour, but Becker attained complete reduction only by using a large excess of zinc dust with sufficient sulphuric acid to dissolve it completely without the aid of heat

Action of Bromic Acid on Metals

About two years ago I submitted to the Iowa Academy of Science a communication on the action of chloric acid on metals, in which it was shown that in some cases the metals dissolved without the evolution of any gas, the action apparently being the oxidation of the metal and the immediate formation of salts from the oxides and the excess of chloric acid, and the hydrochloric acid produced by the reduction of chloric acid. In the cases of some metals there occurred at the same time oxidation of the metal and the evolution of free hydrogen. In fact, in the cases of the alkali metals and magnesium the latter action preponderated

Some Features of Iowa Ground Waters, II

About two years ago the writer read before this body a paper, under the above title, giving a general statement of his work on the quality of Iowa well waters. The accumulating experience of the past two years seems to justify at this time a statement of some additional facts that seem important and which may be of interest to the Iowa Academy of Science

Use of Copper to Increase the Yield of Ethyl Bromide

It has been discovered that the addition of copper punchings to small quantities of the reaction mixture of 95 per cent ethyl alcohol, sulfuric acid, water, and sodium bromide increases the yield of ethyl bromide from 57 per cent obtained without the copper to 80 per cent. The copper reacts with the sulfuric acid producing sulfur dioxide which reduces any bromine formed back to bromide ion and thus prevents a loss of bromine and, of course, increases the yield. The presence of copper as a reducing agent prevents formation of free bromine

Periodical Literature in Iowa on the Subject of Chemistry

The following is a list of the chemical periodicals in the State of Iowa, with the extent of the files and the names of the libraries in which they may be found. The list is prepared and published for the information of chemists who may have occasion to refer to such periodicals in their work. So far as known the books of any file may be used for reference purposes in the libraries which contain them and under certain restrictions, in some cases, they may be taken out for purposes of reference. In some cases the books are in the private libraries of chemists connected with the institutions mentioned, but this does not preclude their use by outside parties

The Action of Certain Oxidizing Agents in Sulfite and Its Determination

The oxidation of sulfite in acid solution by dichromate, bromate and permanganate was found to be incomplete, the oxidant used being several per cent short of that required in each case to change sulfite ion completely into sulfate ion. This is probably clue to the formation of dithionate, which is not further oxidized. Iodate behaves very differently