The Capillary Pumped Loop Flight Experiment (CAPL): A pathfinder for EOS

The CAPL shuttle flight experiment will provide microgravity verification of the prototype capillary pumped loop (CPL) thermal control system for EOS. The design of the experiment is discussed with particular emphasis on the new technology areas in ammonia two-phase reservior design and heat pipe heat exchanger development. The thermal and hydrodynamic analysis techniques and results are also presented, including pressure losses, fluid flow, and non-orbit heat rejection capability. CAPL experiment results will be presented after the flight, presently planned for 1993

Development and Verification of a Flight Stack for a High-Altitude Glider in Ada/SPARK 2014

SPARK 2014 is a modern programming language and a new state-of-the-art tool set for development and verification of high-integrity software. In this paper, we explore the capabilities and limitations of its latest version in the context of building a flight stack for a high-altitude unmanned glider. Towards that, we deliberately applied static analysis early and continuously during implementation, to give verification the possibility to steer the software design. In this process we have identified several limitations and pitfalls of software design and verification in SPARK, for which we give workarounds and protective actions to avoid them. Finally, we give design recommendations that have proven effective for verification, and summarize our experiences with this new language

Ultrasoft NLL Running of the Nonrelativistic O(v) QCD Quark Potential

Using the nonrelativistic effective field theory vNRQCD, we determine the contribution to the next-to-leading logarithmic (NLL) running of the effective quark-antiquark potential at order v (1/mk) from diagrams with one potential and two ultrasoft loops, v being the velocity of the quarks in the c.m. frame. The results are numerically important and complete the description of ultrasoft next-to-next-to-leading logarithmic (NNLL) order effects in heavy quark pair production and annihilation close to threshold.Comment: 25 pages, 7 figures, 3 tables; minor modifications, typos corrected, references added, footnote adde

First-Order Transition in XY Fully Frustrated Simple Cubic Lattice

We study the nature of the phase transition in the fully frustrated simple cubic lattice with the XY spin model. This system is the Villain's model generalized in three dimensions. The ground state is very particular with a 12-fold degeneracy. Previous studies have shown unusual critical properties. With the powerful Wang-Landau flat-histogram Monte Carlo method, we carry out in this work intensive simulations with very large lattice sizes. We show that the phase transition is clearly of first order, putting an end to the uncertainty which has lasted for more than twenty years

Does compliance with codes of conduct make workers better off?: : A study at three garment factories in Vietnam

Over the past decades, there has been a growing number of corporate Codes of Conduct (CoC) being developed and introduced by multinational corporations (MNCs) to promote international labour standards in supply chains. This paper examines the implementation of CoC by suppliers in developing countries. A study was carried out at three garment factories in Vietnam that supply products to a number of well-known international brands. Findings of the research show that there are different levels of compliance with CoC although the three factories are requested to implement the same sets of CoC from similar buyers. The foreign owned factory, which has direct relationships with buyers, complies with most of the standards required in buyers’ CoC while the other two factories, which are subcontracted by intermediaries, violate the codes and deceive auditors to pass buyers’ audits. Nevertheless, workers working in the factory with high level of compliance do not seem to enjoy better working conditions and benefits than those who work at the non-complying factories. The study also found that in the non-complying factories, there is a high level of willingness of workers to collaborate with employers to deceive the auditors. The findings of the study raise the question whether CoC imposed by the MNCs practically help workers in developing countries