Hyperbolic groups acting improperly

In this paper we study hyperbolic groups acting on CAT(0) cube complexes. The first main result (Theorem A) is a structural result about the Sageev construction, in which we relate quasi-convexity of hyperplane stabilizers with quasi-convexity of cell stabilizers. The second main result (Theorem D) generalizes both Agol's theorem on cubulated hyperbolic groups and Wise's Quasi-convex Hierarchy Theorem.Comment: 52pp. In v3, some unnecessary assumptions are dropped from some technical results, especially in Section 5 and Corollary 6.5. The main results are unchanged, but the improved technical results are expected to be useful in future work. Several other small improvements to the exposition have been mad

A dimension-breaking phenomenon for water waves with weak surface tension

It is well known that the water-wave problem with weak surface tension has small-amplitude line solitary-wave solutions which to leading order are described by the nonlinear Schr\"odinger equation. The present paper contains an existence theory for three-dimensional periodically modulated solitary-wave solutions which have a solitary-wave profile in the direction of propagation and are periodic in the transverse direction; they emanate from the line solitary waves in a dimension-breaking bifurcation. In addition, it is shown that the line solitary waves are linearly unstable to long-wavelength transverse perturbations. The key to these results is a formulation of the water wave problem as an evolutionary system in which the transverse horizontal variable plays the role of time, a careful study of the purely imaginary spectrum of the operator obtained by linearising the evolutionary system at a line solitary wave, and an application of an infinite-dimensional version of the classical Lyapunov centre theorem.Comment: The final publication is available at Springer via http://dx.doi.org/10.1007/s00205-015-0941-

Effective Strategies of Military Veteran Small Business Owners

Small businesses owned by military veterans represent a source of new jobs, yet more than half of these businesses fail to survive beyond 5 years. These failures could lead to efforts to identify strategies that owners can use to avoid failure. The conceptual framework applied in this case study was the triple-loop learning theory. The purposive sampling included 7 military veterans who were small business owners who had sustained their small businesses more than 5 years. Data were collected using semistructured interviews and organization documents. Yin\u27s 5-step process for data analysis compiling, disassembling, reassembling, interpreting, and concluding resulted in 4 emergent themes: networking to build the business, mentoring and informal education for ongoing education, identifying gaps of competitors, and maintaining low overhead and operating costs. Military veteran business owners engaged in networking, which led to growth, sustainability, and building relationships. The key concepts discussed by all 7 participants formed the basis of entrepreneurial learning. The results of this study could benefit industry by increasing an income that affords sustainability to the military veteran business owner. Such owners could apply strategies to reduce small business failures and thus contribute to the stable employment of owners and employees. This study could contribute to social change by improving the standard of living in veteran communities as well as improving local and state economies

Arkansas Cotton Variety Test 2003

The primary aim of the Arkansas Cotton Variety Test is to provide unbiased data regarding the agronomic performance of cotton varieties and advanced breeding lines in the major cotton-growing areas of Arkansas. This information helps seed dealers establish marketing strategies and assists producers in choosing varieties to plant. In this way, the annual test facilitates the inclusion of new, improved genetic material in Arkansas cotton production

Teaching conversation skills using BST and video modeling via telehealth

Abstract The COVID-19 pandemic and the current state of education children have limited access to an environment where they can practice conversational skills with people outside of their immediate family. Traditionally, children with autism spectrum disorder (ASD) have a difficult time independently learning these skills, even in an environment that is ripe with social interaction(Grosberg & Charlop, 2017). The current study sought to use behavioral skills training, modeling, and prompting to teach the skills of responding to questions, asking questions, and changing the topic to one learner with ASD over telehealth. The study was conducted over three phases. The first phase consisted of collecting baseline data on the target behaviors. The second was a one-on-one intervention, where the researcher used video modeling to teach the participant one or more of the target conversational skills, they then practiced having conversation and the researcher provided the learner with feedback. These lessons continued, intervening on one behavior at a time until a stable rate of responding was observed. The final phase consisted of a maintenance and generalization assessment. Maintenance sessions occurred two weeks following the intervention and four generalization probes occurred in the home with different people during the final week of the intervention. The results indicate that these conversation skills can be learned through the one-on-one telehealth intervention, can maintain over time, and generalize to real world setting

Separate compilation of structured documents

This paper draws a parallel between document preparation and the traditional processes of compilation and link editing for computer programs. A block-based document model is described which allows for separate compilation of various portions of a document. These portions are brought together and merged by a linker program, called dlink, whose pilot implementation is based on ditroff and on its underlying intermediate code. In the light of experiences with dlink the requirements for a universal object-module language for documents are discussed. These requirements often resemble the characteristics of the intermediate codes used by programming-language compilers but with interesting extra constraints which arise from the way documents are executed

An Anthology of London in Literature, 1558-1914

The General Introduction addresses the unique role of London in English national consciousness and in English literature, given their tendency to represent London as somehow larger than life, as escaping the merely naturalistic and entering the realm of the symbolic or fantastic, with parallels in the great mythopoeic cities of Western culture—Rome, Jerusalem, Athens, Babylon, Troy. It looks at the idea of the City in Classical and Christian culture, as well as London’s development, in the nineteenth-century, into that unprecedented phenomenon, a megalopolis (the Great Wen) that had begun not just to astonish visitors with its size and complexity but to seem alien to its own inhabitants

Starburst-AGN mixing: TYPHOON observations of NGC 1365, NGC 1068, and the effect of spatial resolution on the AGN fraction

We demonstrate a robust method of resolving the star-formation and AGN contributions to emission lines using two very well known AGN systems: NGC 1365, and NGC 1068, using the high spatial resolution data from the TYPHOON/PrISM survey. We expand the previous method of calculating the AGN fraction by using theoretical-based model grids rather than empirical points. The high spatial resolution of the TYPHOON/PrISM observations show evidence of both star formation and AGN activity occurring in the nuclei of the two galaxies. We rebin the data to the lower resolutions, typically found in other integral field spectroscopy surveys such as SAMI, MaNGA, and CALIFA. The results show that when rebinned from the native resolution of TYPHOON (< 200 pc/pixel) to 1 kpc/pixel, the effects include a roughly 3 kpc increase in the radius of measured AGN activity, and a factor of 2 to 7 increase in the detection of low surface brightness features such as shocks. All of this information is critical, because information on certain physical processes may be lost at varying resolutions. We make recommendations for analysing data at current IFU survey resolutions.Comment: 30 pages, 28 figures, accepted for publication by MNRA

The Effects of Diffuse Ionized Gas and Spatial Resolution on Metallicity Gradients: TYPHOON Two-Dimensional Spectrophotometry of M83

We present a systematic study of the diffuse ionized gas (DIG) in M83 and its effects on the measurement of metallicity gradients at varying resolution scales. Using spectrophotometric data cubes of M83 obtained at the 2.5m duPont telescope at Las Campanas Observatory as part of the TYPHOON program, we separate the HII regions from the DIG using the [SII]/H$\alpha$ ratio, HIIphot (HII finding algorithm) and the H$\alpha$ surface brightness. We find that the contribution to the overall H$\alpha$ luminosity is approximately equal for the HII and DIG regions. The data is then rebinned to simulate low-resolution observations at varying resolution scales from 41 pc up to 1005 pc. Metallicity gradients are measured using five different metallicity diagnostics at each resolution. We find that all metallicity diagnostics used are affected by the inclusion of DIG to varying degrees. We discuss the reasons of why the metallicity gradients are significantly affected by DIG using the HII dominance and emission line ratio radial profiles. We find that applying the [SII]/H$\alpha$ cut will provide a closer estimate of the true metallicity gradient up to a resolution of 1005 pc for all metallicity diagnostics used in this study.Comment: 26 pages, 12 figures + Appendix/Supplementary Material, accepted for publication by MNRA