COLD-SAT: A technology satellite for cryogenic experimentation

NASA-Lewis (LeRC) is involved in the development and validation of analytical models which describe the fluid dynamic and thermodynamic processes associated with the storage, acquisition and transfer of subcritical cryogenic fluids in low gravity. Four concurrent studies, including one in-house at LeRC, are underway to determine the feasibility of performing model validation experiments aboard a free-flying spacecraft (S/C) called Cryogenic On-Orbit Liquid Depot-Storage, Acquisition and Transfer (COLD-SAT), using liquid hydrogen as the cryogen. The technology requirements for the experiments are described along with the initial LeRC concepts for the S/C and an experiment subsystem comprising of cryogenic tankage (a supply dewar and three receiver tanks), gas pressurization bottles (both helium and autogenous hydrogen), their associated plumbing, and instrumentation for data collection. Experiments were categorized into enabling/high priority Class 1 technologies and component/system Class 2 demonstrations. As initially envisioned by LeRC, COLD-SAT would have had a 1997 launch aboard a Delta-2 for a 6 month active lifetime in a 925 km orbit with a pseudo-inertial attitude

Cognitive Process Dimension in K-13 E-textbooks for 4th Grade Students

Cognitive dimensions development is one of the objective of education. This research aimed to identify the structure, evaluate the focus, analyze the conformity toward the referred adoption standard, and evaluate the emphasis of thinking skill order of cognitive processes in the e-textbook for 4th grade students. Evaluation was carried out for the curriculum 2013 e-textbooks published in 2014, including theme 2, 3 and 4. Identification of cognitive process dimensions was carried out using revised Bloom's taxonomy, while the conformity was anayzed using Alzu'bi's preference. Statistical analysis was carried out with chi-square test. The result showed that the structure of cognitive dimensions in three examined e-textbooks were not consistent one another. Theme 2 emphasized on the high order thinking skill focused on the creating dimension. Theme 3 emphasized on the low order thinking skill focused on the understanding dimension. While theme 3 facilitated both thinking skill orders with a little tendency to the evaluating dimension. There was no conformity of the cognitive dimensions structure of the three themes toward the referred adoption standard. Statistical analysis showed that there was significant difference on the structure of cognitive dimensions between themes, and between each themes and the referred adoption standard

Peran Uni Eropa dalam Proses Penyelesaian Sengketa Bagi Negara Anggota dan Negara Non Anggota

The main reason for the establishment of the first European Union once was because of the desire to provide protection to the European countries that are victims of cruel regimes of Germany during World War II. After the signing of the Maastricht Treaty in 1992, the European Union is increasingly proving its progress to the International community as one of the largest regional organizations. Expand the authority of the European Union in the field of law to be the same as the state. The European Union has a great sovereignty of the member states. Help resolve internal disputes in the European Union has two methods to resolve the internal disputes through alternative and legal means. The purpose of this paper is to look at the mechanism by the European Union as an International organization in its role to resolve disputes in the European Union. As an International Organisation which aims at maintaining world peace and security, the European Union also play the role to help resolve disputes outside the European Union. With the development of increasingly advanced, the European Union as an International organization has the effect of maintaining security and peace in the world, because it is also the European Union, have the opportunity to be able to play non-member countries to resolve disputes, without passing the limits of the sovereignty of a non-member country

A Dark Core in Abell 520

The rich cluster Abell 520 (z=0.201) exhibits truly extreme and puzzling multi-wavelength characteristics. It may best be described as a "cosmic train wreck." It is a major merger showing abundant evidence for ram pressure stripping, with a clear offset in the gas distribution compared to the galaxies (as in the bullet cluster 1E 0657-558). However, the most striking feature is a massive dark core (721 h_70 M_sun/L_sun) in our weak lensing mass reconstruction. The core coincides with the central X-ray emission peak, but is largely devoid of galaxies. An unusually low mass to light ratio region lies 500 kpc to the east, and coincides with a shock feature visible in radio observations of the cluster. Although a displacement between the X-ray gas and the galaxy/dark matter distributions may be expected in a merger, a mass peak without galaxies cannot be easily explained within the current collisionless dark matter paradigm. Interestingly, the integrated gas mass fraction (~0.15), mass-to-light ratio (220 h_70 M_sun/L_sun), and position on the X-ray luminosity-temperature and mass-temperature relations are unremarkable. Thus gross properties and scaling relations are not always useful indicators of the dynamical state of clusters.Comment: 10 pages, 5 figures, accepted for publication in the Astrophysical Journal, higher resolution version at http://visav.phys.uvic.ca/~amahdav

Diffractive dissociation including pomeron loops in zero transverse dimensions

We have recently studied the QCD pomeron loop evolution equations in zero transverse dimensions [Shoshi:2005pf]. Using the techniques developed in [Shoshi:2005pf] together with the AGK cutting rules, we present a calculation of single, double and central diffractive cross sections (for large diffractive masses and large rapidity gaps) in zero transverse dimensions in which all dominant pomeron loop graphs are consistently summed. We find that the diffractive cross sections unitarise at asymptotic energies and that they are suppressed by powers of alpha_s. Our calculation is expected to expose some of the diffractive physics in hadron-hadron collisions at high energy.Comment: 14 pages, 5 figures; numerous explanations added, matches the published versio