Cooling systems for satellite remote sensing instrumentation

The characteristics of a cryogenic cooling system for the Pollution Monitoring Satellite (PMS) are discussed. Studies were conducted to make the following determinations: (1) the characteristics and use of proven and state-of-the-art cryogenic cooling systems for six specified ranges of performance, (2) the system most applicable for each of the six cooling categories, and (3) conceptual designs for candidate system for each of the six representative cooling categories. The six cooling categories of electrical loads are defined. The desired mission life for the cooling system is two years with both continuous and intermittent operating conditions

SINDA/SINFLO computer routine, volume 1, revision A

The SINFLO package was developed to modify the SINDA preprocessor to accept and store the input data for fluid flow systems analysis and adding the FLOSOL user subroutine to perform the flow solution. This reduced and simplified the user input required for analysis of flow problems. A temperature calculation method, the flow-hybrid method which was developed in previous VSD thermal simulator routines, was incorporated for calculating fluid temperatures. The calculation method accuracy was improved by using fluid enthalpy rather than specific heat for the convective term of the fluid temperature equation. Subroutines and data input requirements are described along with user subroutines, flow data storage, and usage of the plot program

Consent and Exchange

In some cases, the law permits a party that unilaterally provides a benefit to another party to recover the estimated value of this benefit. Despite calls for expanding the set of cases to which such a restitution rule applies, the law commonly applies a mutual consent rule under which a party providing another with a benefit cannot obtain any recovery without securing the advance consent of the beneficiary to the transaction. We provide an efficiency rationale for the undesirability of broad use of the restitution rule by identifying significant adverse ex ante effects of the rule that are avoided by the consent requirement. Even assuming that courts' errors in estimating buyer benefits would be unbiased, a restitution rule would strengthen sellers' hand by providing them with a put option that they may but do not have to use. As a result, the restitution rule would encourage inefficient market entry by low-quality sellers that would not contribute to any efficient transactions but would be able to extract payments from buyers seeking to avoid an exchange with them. Furthermore, the restitution rule would discourage efficient market entry by some or all potential buyers of a good or service. Beyond the restitution rule, we extend our analysis to show that similar adverse effects can also arise from other "pricing" rules that provide buyers or sellers with call or put options to force an exchange at a judicially-determined price.

Conjunctions of social categories considered from different points of view

Conjunctions of divergent social categories may elicit emergent attributes to render the composite concept more coherent. Following Kunda, Miller & Clare, (1990) participants listed and rated attributes for people who belong to unexpected conjunctions of social categories. In order to explore the flexibility in such constructions, they were also asked to adopt the point of view of a person in one of the two categories. Experiment 1 found that when adopting the point of view of one constituent category, people tended to combine the concepts antagonistically, meaning that they attributed to members of the conjunction the more negative aspects of the opposing category. Experiment 2 showed that this polarizing effect was reduced when the point of view category was itself unusual. Strong gender stereotype differences were also found in the degree to which combinations were antagonistic. Female stereotypes as points of view generated a greater degree of integration in the conceptual combination

The symmetry of the spin Hamiltonian in herbertsmithite, a spin-1/2 kagom\'{e} lattice

We present magnetization measurements on oriented powder of ZnCu$_{3}$(OH)$_{6}$Cl$_{2}$ along and perpendicular to the orienting field. We find a dramatic difference in the magnetization between the two directions. It is biggest at low measurement fields $H$ or high temperatures. We show that the difference at high temperatures must emerge from Ising-like exchange anisotropy. This allows us to explain muon spin rotation data at $T\to 0$ in terms of an exotic ferromagnetic ground state.Comment: 5 pages, 5 figure