Combining Semi-Analytic Models of Galaxy Formation with Simulations of Galaxy Clusters: the Need for AGN Heating

We present hydrodynamical N-body simulations of clusters of galaxies with feedback taken from semi-analytic models of galaxy formation. The advantage of this technique is that the source of feedback in our simulations is a population of galaxies that closely resembles that found in the real universe. We demonstrate that, to achieve the high entropy levels found in clusters, active galactic nuclei must inject a large fraction of their energy into the intergalactic/intracluster media throughout the growth period of the central black hole. These simulations reinforce the argument of Bower et al. (2008), who arrived at the same conclusion on the basis of purely semi-analytic reasoning.Comment: 4 pages, 1 figure. To appear in the proceedings of "The Monster's Fiery Breath", Eds. Sebastian Heinz and Eric Wilcots (AIP conference series

PR 610 The Servant as Proclaimer

“The Witness of Preaching” by Thomas Long and “Narrative Reading, Narrative Preaching” by Joel Green and Michael Pasquarellohttps://place.asburyseminary.edu/syllabi/2638/thumbnail.jp

Fuels for Calibration of Fuel Flowmeters

Approximately two years ago, a contract was signed between Bendix Aviation Corporation and St. Ambrose College of Davenport, Iowa, initiating the Student Industrial Research Program. For the past nine months, in conjunction with this program, work has been done on the project entitled Fuels for Calibration of Fuel Flowmeters. It is a known fact that in calibrating any measuring device, it is necessary to use a standard reflecting the properties of the material to be measured in service. Specifically, we are concerned with aviation fuel flowmeters. It has recently become apparent that some jet fuels in current production depart from the calibrating standards now in force at Pioneer-Central Division of Bendix. An awareness of this fact led to the initiation of this project. In calibrating a fuel flowmeter, the physical properties of the fuel, namely, specific gravity and viscosity, must be accurately controlled. Temperature variation does not affect the calibration due to temperature compensators within the sealed system. In order to determine the most advantageous values of specific gravity and viscosity, it was necessary to obtain samples of these fuels from oil companies all over the world. In view of this, the investigation was divided into two phases; the first concerning domestic fuels, and the second concerning foreign fuels

PR 610 The Servant as Proclaimer

“Lectures on Preaching” Phillips Brooks “The Homiletical Plot” Eugene Lowery “The Practice of Preaching” Paul Scott Wilson “The Four Pages of the Sermon: A Guide to Biblical Preaching” Paul Scott Wilson “The Witness of Preaching” by Thomas Long “The Preaching Life” by Barbara Brown Taylorhttps://place.asburyseminary.edu/syllabi/3232/thumbnail.jp

Quantum equilibration in finite time

It has recently been shown that small quantum subsystems generically equilibrate, in the sense that they spend most of the time close to a fixed equilibrium state. This relies on just two assumptions: that the state is spread over many different energies, and that the Hamiltonian has non-degenerate energy gaps. Given the same assumptions, it has also been shown that closed systems equilibrate with respect to realistic measurements. We extend these results in two important ways. First, we prove equilibration over a finite (rather than infinite) time-interval, allowing us to bound the equilibration time. Second, we weaken the non degenerate energy gaps condition, showing that equilibration occurs provided that no energy gap is hugely degenerate.Comment: 7 page

Malcolm X, the Elegant Warrior: The Leadership Style of El Hajj Malik El Shabazz

Malik El Shabazz, also known as Malcolm X, is as relevant to today\u27s society as he was at the height of the civil rights era. As a leader, Malcolm X possessed and demonstrated the skills of a militarily trained general, motivational speaker, CEO, coach and religious visionary - a person spiritually enlightened with a battle-tested soul. Many have used his name in anger and misinterpreted him when they want to shift away from the civil rights era language of love and brotherhood. He has become the African American equivalent of Che Guevara. It is the goal of this research to point out the unique combination of various leadership principles he adapted and practiced while transforming from Malcolm X into Malik El Shabazz. This research will also show the validity of Malcolm X\u27s leadership style in this day and time - a style that can be called that of the elegant warrior

Bulk and boundary g2g_2 factorized S-matrices

We investigate the $g_2$-invariant bulk (1+1D, factorized) $S$-matrix constructed by Ogievetsky, using the bootstrap on the three-point coupling of the vector multiplet to constrain its CDD ambiguity. We then construct the corresponding boundary $S$-matrix, demonstrating it to be consistent with $Y(g_2,a_1\times a_1)$ symmetry.Comment: 7 page

Superconductivity and Cobalt Oxidation State in Metastable Na(x)CoO(2-delta)*yH2O (x ~ 1/3; y ~ 4x)

We report the synthesis and superconducting properties of a metastable form of the known superconductor NaxCoO2*yH2O (x ~ 1/3, y ~ 4x). Instead of using the conventional bromine-acetonitrile mixture for sodium deintercalation, we use an aqueous bromine solution. Using this method, we oxidize the sample to a point that the sodium cobaltate becomes unstable, leading to formation of other products if not controlled. This compound has the same structure as the reported superconductor, yet it exhibits a systematic variation of the superconducting transition temperature (Tc) as a function of time. Immediately after synthesis, this compound is not a superconductor, even though it contains appropriate amounts of sodium and water. The samples become superconducting with low Tc values after ~ 90 h. Tc continually increases until it reaches a maximum value (4.5 K) after about 260 h. Then Tc drops drastically, becoming non-superconducting approximately 100 h later. Corresponding time-dependent neutron powder diffraction data shows that the changes in superconductivity exhibited by the metastable cobaltate correspond to slow formation of oxygen vacancies in the CoO2 layers. In effect, the formation of these defects continually reduces the cobalt oxidation state causing the sample to evolve through its superconducting life cycle. Thus, the dome-shaped superconducting phase diagram is mapped as a function of cobalt oxidation state using a single sample. The width of this dome based on the formal oxidation state of cobalt is very narrow - approximately 0.1 valence units wide. Interestingly, the maximum Tc in NaxCoO2*yH2O occurs when the cobalt oxidation state is near 3.5. Thus, we speculate that the maximum Tc occurs near the charge ordered insulating state that correlates with the average cobalt oxidation state of 3.5.Comment: 22 pages, 9 figures, 1 tabl