Implementation, verification and validation of empirical transition criteria for airfoil and rotary wing applications using the DLR FLOWer code.

This report covers the implementation, verification and validation of a transition prediction method for airfoil and rotary wing applications based on the DLR-FLOWer code. The prediction method features five empirical criteria according to minimum pressure, laminar separation, Michel, van Driest & Blumer and Arnal, Habiballah & Delcourt (AHD). The criteria’s equations will be briefly summarized. The prediction method’s algorithm and it’s implementation into the DLR’s structured flow solver FLOWer will be described. Validation has been carried out for the Somer’s airfoil (M∞ = 0.3, α = [−5◦ , 15◦]) as well as the CAST10 airfoil (M∞ = 0.73, α = −0.25◦ ). A verification of the implemented method has been done using the ONERA 7A rotor hover test case. Finally, the method is applied to a recent rotor geometry in hover, representing an industrial application case

Fluid Control in Rocket Injectors with the Use of Pressurized Systems for Throttling

Throttling a rocket is a necessary task that must be accomplished in order to achieve proper efficiency and performance over a desired thrust range. Simply put, throttling is achieved by managing the fluid flow in a rocket injector in order to insure proper functioning. There are several different methods on how to throttle rockets, but a simple and inexpensive method is desired in some applications, such as student built University projects. A hot fire test of a hybrid rocket motor was conducted at Purdue University in May 2013, after which a throttling method was desired. The method proposed in this document outlines the use of a pressurized system to deliver oxidizer fluid. A modified throttling valve is utilized to manage oxidizer flow rate in a hybrid rocket engine by altering the pressure gradient. The goal of throttling this rocket will be to maintain a proper oxidizer to fuel (O/F) ratio by decreasing the mass flow rate of the oxidizer in a pressurized nitrogen system. Upon cold flow and hot-fire testing, results and data will provide insight on further design modifications to insure proper performance of the hybrid rocket engine mentioned above. Additional work on this topic will need to be done after the planned tests of summer 2013

Ecumenical modal logic

The discussion about how to put together Gentzen's systems for classical and intuitionistic logic in a single unified system is back in fashion. Indeed, recently Prawitz and others have been discussing the so called Ecumenical Systems, where connectives from these logics can co-exist in peace. In Prawitz' system, the classical logician and the intuitionistic logician would share the universal quantifier, conjunction, negation, and the constant for the absurd, but they would each have their own existential quantifier, disjunction, and implication, with different meanings. Prawitz' main idea is that these different meanings are given by a semantical framework that can be accepted by both parties. In a recent work, Ecumenical sequent calculi and a nested system were presented, and some very interesting proof theoretical properties of the systems were established. In this work we extend Prawitz' Ecumenical idea to alethic K-modalities

Probing Trilinear Gauge Boson Interactions via Single Electroweak Gauge Boson Production at the LHC

We analyze the potential of the CERN Large Hadron Collider (LHC) to study anomalous trilinear vector-boson interactions W^+ W^- \gamma and W^+ W^- Z through the single production of electroweak gauge bosons via the weak boson fusion processes q q -> q q W (-> \ell^\pm \nu) and q q -> q q Z(-> \ell^+ \ell^-) with \ell = e or \mu. After a careful study of the standard model backgrounds, we show that the single production of electroweak bosons at the LHC can provide stringent tests on deviations of these vertices from the standard model prediction. In particular, we show that single gauge boson production exhibits a sensitivity to the couplings \Delta \kappa_{Z,\gamma} similar to that attainable from the analysis of electroweak boson pair production.Comment: 20 pages, 6 figure

Mutant mitochondrial elongation factor G1 and combined oxidative phosphorylation deficiency

Although most components of the mitochondrial translation apparatus are encoded by nuclear genes, all known molecular defects associated with impaired mitochondrial translation are due to mutations in mitochondrial DNA. We investigated two siblings with a severe defect in mitochondrial translation, reduced levels of oxidative phosphorylation complexes containing mitochondrial DNA (mtDNA)–encoded subunits, and progressive hepatoencephalopathy. We mapped the defective gene to a region on chromosome 3q containing elongation factor G1 (EFG1), which encodes a mitochondrial translation factor. Sequencing of EFG1 revealed a mutation affecting a conserved residue of the guanosine triphosphate (GTP)–binding domain. These results define a new class of gene defects underlying disorders of oxidative phosphorylation

Preliminary results from a simulation of quenched QCD with overlap fermions on a large lattice

We simulate quenched QCD with the overlap Dirac operator. We work with the Wilson gauge action at beta=6 on an 18^3x64 lattice. We calculate quark propagators for a single source point and quark mass ranging from am_q=0.03 to 0.75. We present here preliminary results based on the propagators for 60 gauge field configurations.Comment: Lattice2003(chiral); 9 latex pages (espcrc2.sty), 13 figures. Based on talks given by C.H., L.L. and C.R. at 21st International Symposium on Lattice Field Theory (Lattice 2003), Tsubuka, Japan, 15-19 July 2003. Repitition in references corrected and one reference adde

The B_s and D_s decay constants in 3 flavor lattice QCD

Capitalizing on recent advances in lattice QCD, we present a calculation of the leptonic decay constants f_{B_s} and f_{D_s} that includes effects of one strange sea quark and two light sea quarks. The discretization errors of improved staggered fermion actions are small enough to simulate with 3 dynamical flavors on lattices with spacings around 0.1 fm using present computer resources. By shedding the quenched approximation and the associated lattice scale ambiguity, lattice QCD greatly increases its predictive power. NRQCD is used to simulate heavy quarks with masses between 1.5 m_c and m_b. We arrive at the following results: f_{B_s} = 260 \pm 7 \pm 26 \pm 8 \pm 5 MeV and f_{D_s} = 290 \pm 20 \pm 29 \pm 29 \pm 6 MeV. The first quoted error is the statistical uncertainty, and the rest estimate the sizes of higher order terms neglected in this calculation. All of these uncertainties are systematically improvable by including another order in the weak coupling expansion, the nonrelativistic expansion, or the Symanzik improvement program.Comment: 4 page