Optimum outgassing cycles for aluminum and stainless steel

Outgassing rates were measured for a modified 7075T6 aluminum and 304L stainless steel, for two degrees of finish, at temperatures of 285 deg F to 392 deg F, for times of 0.5 to 72 hours. The results were analyzed to determine optimum time and temperature cycles for outgassing. Optimum cycles were determined with and without the limitations of a graph. The graph related allowable time at temperature to a 5 percent or less reduction in room temperature properties of 7075T6 aluminum. For aluminum, within the limits set by reduction in mechanical properties, the optimum cycle tested was 40 hours at 285 deg F. Disregarding the limits, optimum outgassing was achieved at the highest temperatures and longest times tested, for both aluminum and stainless steel

Partial breakdown of quantum thermalization in a Hubbard-like model

We study the possible breakdown of quantum thermalization in a model of itinerant electrons on a one-dimensional chain without disorder, with both spin and charge degrees of freedom. The eigenstates of this model exhibit peculiar properties in the entanglement entropy, the apparent scaling of which is modified from a "volume law" to an "area law" after performing a partial, site-wise measurement on the system. These properties and others suggest that this model realizes a new, non-thermal phase of matter, known as a quantum disentangled liquid (QDL). The putative existence of this phase has striking implications for the foundations of quantum statistical mechanics.Comment: As accepted to PR

On the physical association of the peculiar emission: Line stars HD 122669 and HD 122691

Spectroscopic and photometric observations indicate a physical association between the peculiar early-type emission-line stars HD 122669 and HD 122691. The latter has undergone a drastic change in the strength of its emission lines during the past twenty years. There is some indication that both stars vary with shorter time scales

Domestic International Sales Corporations (DISCs): How They provide a Tax Incentive for Exports

This Note examines the logical and empirical validity of the reasons for the passage of the DISC legislation. Basically, the DISC legislation was prompted by the negative trade balance in 1971, a novel phenomenon in post-World War II United States. Providing a tax break on producers\u27 export income was viewed as a way of reducing trade deficits by stimulating exports. On its surface, using tax expenditures to reach this goal seems logical, or at least benign. But when one considers that the primary thrust of the legislation was to encourage small producers to enter the export market, the logic of using a statutory plan that is convoluted at best and baroque at worst is seriously flawed. After reviewing the legislative history of DISCs, this Note examines the basic mechanics of setting up and operating them. Next, selected aspects of the inner workings of these special corporations will be examined in detail, with particular attention paid to strategies for maximizing DISC benefits. In the final section, policy considerations will be considered in light of a conclusion: Despite the well-intentioned goals of DISC legislation, the DISC concept has been developed in an overly detailed statute, the complex wording of which threatens to obscure the whole purpose of DISCs. That the DISC provisions\u27 marginal impact on reducing trade deficits is so small compared to the compliance maze they create argues strongly for either their immediate repeal or their drastic simplification. While the rules are in effect, however, tax managers of companies with significant income from exports are foolish not to gain tax advantages with DISCs