The Effect on Rudder Control of Slip Stream Body, and Ground Interference

This investigation was undertaken to determine the relative effects of those factors which may interfere with the rudder control of an airplane, with especial reference to the process of landing. It shows that ground interference is negligible, but that the effects of a large rounded body and of the slip stream may combine to interfere seriously with rudder control at low flying speeds and when taxiing

Joachim Nowotny: Letzter Auftritt der Komparsen

Halle/Leipzig: Mitteldeutscher Verlag, 1981. 214 p., 7,- M

Asperity contacts at the nanoscale: comparison of Ru and Au

We develop and validate an interatomic potential for ruthenium based on the embedded atom method framework with the Finnis/Sinclair representation. We confirm that the new potential yields a stable hcp lattice with reasonable lattice and elastic constants and surface and stacking fault energies. We employ molecular dynamics simulations to bring two surfaces together; one flat and the other with a single asperity. We compare the process of asperity contact formation and breaking in Au and Ru, two materials currently in use in micro electro mechanical system switches. While Au is very ductile at 150 and 300 K, Ru shows considerably less plasticity at 300 and 600 K (approximately the same homologous temperature). In Au, the asperity necks down to a single atom thick bridge at separation. While similar necking occurs in Ru at 600 K, it is much more limited than in Au. On the other hand, at 300 K, Ru breaks by a much more brittle process of fracture/decohesion with limited plastic deformation.Comment: 10 pages, 13 figure

A double-helix neutron detector using micron-size B-10 powder

A double-helix electrode configuration is combined with a $^{10}$B powder coating technique to build large-area (9 in $\times$ 36 in) neutron detectors. The neutron detection efficiency for each of the four prototypes is comparable to a single 2-bar $^3$He drift tube of the same length (36 in). One unit has been operational continuously for 18 months and the change of efficiency is less than 1%. An analytic model for pulse heigh spectra is described and the predicted mean film thickness agrees with the experiment to within 30%. Further detector optimization is possible through film texture, power size, moderator box and gas. The estimated production cost per unit is less than 3k US\$ and the technology is thus suitable for deployment in large numbers

An exploration of the experience of codependency through interpretative phenomenological analysis

This thesis was submitted for the award of Doctor of Philosophy and was awarded by Brunel University LondonCodependency is a highly contested construct featuring in the popular, clinical and research literature. Within the academic literature, the voices and lived experience of individuals who consider themselves codependents are mostly unavailable. This Interpretative Phenomenological Analysis (IPA) study explored the lived experiences of 8 individuals self-identified as codependents, who chose 12-Step recovery groups to frame their recovery process. This research addressed the following research question: What is the lived experience of codependency among people who have sought support from a 12-step recovery group for codependents? The idiographic, phenomenological and hermeneutic aspects of the study captured how participants made sense of their experiences of codependency and the meanings of the support group. The information was collected over 3-6 months by means of three in-depth semi-structured interviews and a visual method in which participants selected and analysed objects or photographs which, for them, expressed the meaning of codependency. Four main themes emerged from the analysis of the interviews: (1) Codependency experienced as real and tangible: ‘Codependency explains everything’. (2) Experiencing an undefined sense of self: ‘Codependency helps me to discover my sense of self.’ (3) Seesawing through extremes in life: ‘Like a seesaw, I feel out of control’. (4) Finding meaning in codependency through exploring family experiences: ‘Down to childhood’. The findings revealed that the experience of codependency frames these individuals’ sense of identity, their lifeworlds and the way they view and experience life difficulties. It also provided a highly nuanced and fine-grained analysis of the lived experience of codependency. The study brings a new perspective on the lived experiences of this client group. Although the findings are not straightforwardly generalizable, they may inform clinical practice. It is hoped that this study will raise awareness about this controversial topic, bring a better understanding of codependency and inspire further research

Finite automata for caching in matrix product algorithms

A diagram is introduced for visualizing matrix product states which makes transparent a connection between matrix product factorizations of states and operators, and complex weighted finite state automata. It is then shown how one can proceed in the opposite direction: writing an automaton that ``generates'' an operator gives one an immediate matrix product factorization of it. Matrix product factorizations have the advantage of reducing the cost of computing expectation values by facilitating caching of intermediate calculations. Thus our connection to complex weighted finite state automata yields insight into what allows for efficient caching in matrix product algorithms. Finally, these techniques are generalized to the case of multiple dimensions.Comment: 18 pages, 19 figures, LaTeX; numerous improvements have been made to the manuscript in response to referee feedbac

Measuring dark matter substructure with galaxy-galaxy flexion statistics

It is of great interest to measure the properties of substructures in dark matter haloes at galactic and cluster scales. Here we suggest a method to constrain substructure properties using the variance of weak gravitational flexion in a galaxy-galaxy lensing context; this is a statistical method, requiring many foreground-background pairs of galaxies. We show the effectiveness of flexion variance in measuring substructures in N-body simulations of dark matter haloes, and present the expected galaxy-galaxy lensing signals. We show the insensitivity of the method to the overall galaxy halo mass, and predict the method's signal-to-noise ratio for a space-based all-sky survey, showing that the presence of substructure down to 109 M⊙ haloes can be reliably detecte

The economics of broiler, grain, and trout production as a risk diversification strategy

AbstractA comprehensive farm-level stochastic and dynamic capital budgeting simulation model (AQUASIM) is used to evaluate the economic benefits of incorporating a small-scale trout enterprise with a grain and broiler farm. The simulation results indicate that combining aquaculture production with traditional agriculture increased expected income and reduced risk substantially. The use of external debt capital improved the after-tax net present values and internal rates of return but lowered net cash farm income. This study shows the importance of enterprise diversification in stabilizing variability in expected income

A Tunable Echelle Imager

We describe and evaluate a new instrument design called a Tunable Echelle Imager (TEI). In this instrument, the output from an imaging Fabry-Perot interferometer is cross-dispersed by a grism in one direction and dispersed by an echelle grating in the perpendicular direction. This forms a mosaic of different narrow-band images of the same field on a detector. It offers a distinct wavelength multiplex advantage over a traditional imaging Fabry-Perot device. Potential applications of the TEI include spectrophotometric imaging and OH-suppressed imaging by rejection.Comment: 11 pages, 12 figures, accepted by PAS