Computer program predicts thermal and flow transients experienced in a reactor loss- of-flow accident

Program analyzes the consequences of a loss-of-flow accident in the primary cooling system of a heterogeneous light-water moderated and cooled nuclear reactor. It produces a temperature matrix 36 x 41 /x,y/ which includes fuel surface temperatures relative to the time the pump power was lost

High-temperature Adhesive Development and Evaluation

High-temperature adhesive systems are evaluated for short and long-term stability at temperatures ranging from 232C to 427C. The resins selected for characterization include: NASA Langley developed polyphenylquinoxaline (PPQ), and commercially available polyimides (PI). The primary method of bond testing is single lap shear. The PPQ candidates are evaluated on 6A1-4V titanium adherends with chromic acid anodize and phosphate fluoride etch surface preparations. The remaining adhesives are evaluated on 15-5 PH stainless steel with a sulfuric acid anodize surface preparation. Preliminary data indicate that the PPQ adhesives tested have stability to 3000 hours at 450F with chromic acid anodize surface preparation. Additional studies are continuing to attempt to improve the PPQ's high-performance by formulating adhesive films with a boron filler and utilizing the phosphate fluoride surface preparation on titanium. Evaluation of the polyimide candidates on stainless-steel adherends indicates that the FM-35 (American Cyanamid), PMR-15 (U.S. Polymeric/Ferro), TRW partially fluorinated polyimide and NR 150B2S6X (DuPont) adhesives show sufficient promise to justify additional testing

Measurements of an ionizable constituent of low ionosphere using a Lyman-alpha source and blunt probe

Ionizable constituent density measurement of D region using Lyman-alpha source and blunt prob

Do banks propagate debt market shocks?

Over the years, U.S. banks have increasingly relied on the bond market to finance their business. This created the potential for a link between the bond market and the corporate sector whereby borrowers, including those that do not rely on bond funding, became exposed to the conditions in the bond market. We investigate the importance of this link. Our results show that when the cost to access the bond market goes up, banks that rely on bond financing charge higher interest rates on their loans. Banks that rely exclusively on deposit funding follow bond financing banks and increase the interest rates on their loans, though by smaller amounts. Further, banks pass the bond market shocks predominantly to their risky borrowers that have access to the bond market and to their borrowers that do not have access to the bond market. These results show that banks propagate shocks to the bond market by passing them through their loan policies to their borrowers, including those that do not use bond financing.Banks and banking ; Banks and banking - Costs ; Bond market

Evaluation of absorption cycle for space station environmental control system application Interim report

Zero-gravity absorption refrigeration system design and performance testing for space station environmental control applicatio

Evaluation of high temperature structural adhesives for extended service, phase 4

The evaluation of three phenylquinoxaline polymers as high temperature structural adhesives is presented. These included an experimental crisskubjabke oiktner (X-PQ) and two experimental materials (PPQ-2501) and (PPQ-HC). Lap shear, crack extension, and climing drum peel specimens were fabricated from all three polymers, and tested after thermal, combined thermal/humidity, and stressed Skydrol exposure. All three polymers generally performed well as adhesives at initial test temperatures from 219K (-67 F) to 505K (450 F) and after humidity exposure. The 644K (700 F) cured test specimens exhibited superior Skydrol resistance and thermal stability at 505K (450 F) when compared to the 602K (625 F) cured test specimens

Relation between potassium and the malate and tartrate contents of grape berries

The relationship between potassium and malate and tartrate in grape berries was investigated in fruit from Shiraz vines grown in the glasshouse and from fieldgrown Sultana vines. The potassium content of Shiraz berries was varied by varying the potassium supply and that of the Sultana berries by use of rootstocks.No relations)lip between potassium and malate or tartrate during the acid accumulating stage of berry development was found. However, a direct relationship between potassium and malate developed during ripening. No relationship between potassium and tartrate in ripe berries Was seen. A possible causal relationship between potassium and malate concentrations in ripe grapes is discussed.Ripe Sultana grapes grown on the Vitis champini rootstocks, Dog Ridge and Salt Creek, had higher potassium and malate contents, higher titratable acidity and higher pH values than grapes grown on their own roots. Values for grapes grown on 101-14 and Teleki C stocks were intermediate. The enological significance of these results is discussed.Beziehungen zwischen der Kaliumversorgung und dem Malat- und Tartratgehalt von TraubenbeerenDie Beziehungen zwischen Kalium und Malat bzw. Tartrat in Traubenbeeren wurden bei Shiraz-Trauben aus dem Gewächshaus und Sultana-Trauben aus dem Freiland untersucht. Bei den Shiraz-Beeren wurde der Kaliumgehalt über die Düngung, bei den Sultana-Beeren durch Verwendung unterschiedlicher Unterlagen variiert.Zur Zeit der Säureakkumulation wurde in den Beeren keine Beziehung zwischen Kalium und Malat oder Tartrat gefunden. Während der Reife zeichnete sich jedoch eine unmittelbare Beziehung zwischen Kalium und Malat ab. Zwischen Kalium und Tartrat wurde in den reifen Beeren keine Beziehung festgestellt: Eine denkbare ursächliche Beziehung zwischen dem Kalium- und Malatgehalt der reifen Trauben wird diskutiert. Reife Sultana-Trauben hatten auf den Vitis-champini-Unterlagen Dog Ridge und Salt Creek einen höheren Kalium- und Malatgehalt, mehr titrierbare Säure und höheren pH als Trauben von wurzelechten Reben. Auf den Unterlagen 101-14 und Teleki C gezogene Trauben zeigten mittlere Werte. Die önologische Bedeutung dieser Ergebnisse wird diskutiert