Omniscopes: Large Area Telescope Arrays with only N log N Computational Cost

We show that the class of antenna layouts for telescope arrays allowing cheap analysis hardware (with correlator cost scaling as N log N rather than N^2 with the number of antennas N) is encouragingly large, including not only previously discussed rectangular grids but also arbitrary hierarchies of such grids, with arbitrary rotations and shears at each level. We show that all correlations for such a 2D array with an n-level hierarchy can be efficiently computed via a Fast Fourier Transform in not 2 but 2n dimensions. This can allow major correlator cost reductions for science applications requiring exquisite sensitivity at widely separated angular scales, for example 21cm tomography (where short baselines are needed to probe the cosmological signal and long baselines are needed for point source removal), helping enable future 21cm experiments with thousands or millions of cheap dipole-like antennas. Such hierarchical grids combine the angular resolution advantage of traditional array layouts with the cost advantage of a rectangular Fast Fourier Transform Telescope. We also describe an algorithm for how a subclass of hierarchical arrays can efficiently use rotation synthesis to produce global sky maps with minimal noise and a well-characterized synthesized beam.Comment: Replaced to match accepted PRD version. 10 pages, 9 fig

Development and evaluation of the Dignity Talk question framework for palliative patients and their families: A mixed-methods study

Background: Effective patient–family communication can reduce patients’ psychosocial distress and relieve family members’ current suffering and their subsequent grief. However, terminally ill patients and their family members often experience great difficulty in communicating their true feelings, concerns, and needs to each other. Aim: To develop a novel means of facilitating meaningful conversations for palliative patients and family members, coined Dignity Talk, explore anticipated benefits and challenges of using Dignity Talk, and solicit suggestions for protocol improvement. Design: A convergent parallel mixed-methods design. Dignity Talk, a self-administered question list, was designed to prompt end-of-life conversations, adapted from the Dignity Therapy question framework. Participants were surveyed to evaluate the Dignity Talk question framework. Data were analyzed using qualitative and quantitative methods. Setting/participants: A total of 20 palliative patients, 20 family members, and 34 healthcare providers were recruited from two inpatient palliative care units in Winnipeg, Canada. Results: Most Dignity Talk questions were endorsed by the majority of patients and families (>70%). Dignity Talk was revised to be convenient and flexible to use, broadly accessible, clearly stated, and sensitively worded. Participants felt Dignity Talk would be valuable in promoting conversations, enhancing family connections and relationships, enhancing patient sense of value and dignity, promoting effective interaction, and attending to unfinished business. Participants suggested that patients and family members be given latitude to respond only to questions that are meaningful to them and within their emotional capacity to broach. Conclusion: Dignity Talk may provide a gentle means of facilitating important end-of-life conversations

Experiences and satisfaction of children, young people and their parents with alternative mental health models to inpatient settings : a systematic review

Community-based mental health services for children and young people (CYP) can offer alternatives to inpatient settings and treat CYP in less restrictive environments. However, there has been limited implementation of such alternative models, and their efficacy is still inconclusive. Notably, little is known of the experiences of CYP and their parents with these alternative models and their level of satisfaction with the care provided. Therefore, the main aim of this review was to understand those experiences of the accessibility of alternative models to inpatient care, as well as overall CYP/parental satisfaction. A searching strategy of peer-reviewed articles was conducted from January 1990 to December 2018, with updated searches conducted in June 2019. The initial search resulted in 495 articles, of which 19 were included in this review. A narrative synthesis grouped the studies according to emerging themes: alternative models, tele-psychiatry and interventions applied to crisis, and experiences and satisfaction with crisis provision. The identified articles highlighted increased satisfaction in CYP with alternative models in comparison with care as usual. However, the parental experiential data identified high levels of parental burden and a range of complex emotional reactions associated with engagement with crisis services. Furthermore, we identified a number of interventions, telepsychiatric and mobile solutions that may be effective when applied to urgent and emergency care for CYP experiencing a mental health crisis. Lastly, both parental and CYP experiences highlighted a number of perceived barriers associated with help-seeking from crisis services

Activated Carbon Pore Expansion using Acidic Hydrothermal Method

Petroleum Coke is a widely abundant, high carbon content material produced as a byproduct of the oil refining process. Its abundance makes the price per ton low and it is produced in almost all regions of the world. Due to the low price and high carbon percentage, commercial companies make large amounts of activated carbon using petroleum coke as a precursor. These activated carbons are characterized by their high surface area and can achieve widely varying pore morphology with different activation processes. The goal of this work is to achieve a homologous mesopore activated carbon material for use in super capacitor and catalysis applications using commercial activated carbon. Using a mixture of nitric acid and sulfuric acid, the mostly microporous (pores of diameter less than 2nm) petroleum coke derived activated carbon are etched away to make meso-pores (diameter between 2nm and 50nm)

Two Epochs of Very Large Array Observations of Water Maser Emission in the active galaxy NGC 6240

Studies of 22GHz H2O maser emission from the merging galaxy NGC 6240 with double nuclei are presented. Two epochs of Very Large Array (VLA) observations in the A-configuration in spectral-line mode were carried out at 0.1 arcsec resolution by covering the redshifted velocity range of ~ 300 km/s with respect to the systemic velocity of the galaxy. The purpose of these new observations is twofold: to detect an H2O maser that an earlier VLA observation pinpointed in the southern nucleus in the northern nucleus as well to clarify the kinematics of the double nuclei, and to understand the origin of the maser in the galaxy. In the second epoch, one velocity feature peaking at Vlsr=7491.1 km/s, redshifted by ~200 km/s relative to the systemic velocity, was detected only toward the southern nucleus. The detection of an H2O maser feature at or near this velocity had never been reported in earlier observations. However, including the known velocity features at redshifted velocities, no other velocity features were observed toward either nuclei throughout these epochs. The maser remains unresolved at an angular resolution of ~ 0".1, corresponding to a linear size of less than about 45 pc. The two epochs of VLA observations show that the maser intensity is variable on timescales of at least three months, while the correlation between the maser intensity and the radio continuum intensity is not certain from our data. It is plausible that the maser in NGC 6240 is associated with the activity of an active galactic nucleus in the southern nucleus. Alternatively, the maser can be explained by starforming activity at the site of massive starformation in the galaxy.Comment: 6 Pages, 3 Figures, published in AJ, the journal reference adde

Teaching Music Theory and History with Collaborative Awareness

The disciplines of music history and music theory are integrally linked: One cannot be studied without the other. Courses in these disciplines are at the core of many undergraduate music degree programs, and upon completing a graduate degree in music at Andrews University, students are expected to demonstrate the ability to synthesize their knowledge in both disciplines. The path towards successfully teaching these skills of synthesis involves awareness and collaboration between teachers in both disciplines, and it involves active inclusion of students’ own choices and goals in the music they study

The July 2010 outburst of the NLS1 PMN J0948+0022

We report about the multiwavelength campaign on the Narrow-Line Seyfert 1 (NLS1) Galaxy PMN J0948+0022 (z = 0.5846) performed in 2010 July-September and triggered by high activity as measured by Fermi/LAT. The peak luminosity in the 0.1-100 GeV energy band exceeded, for the first time in this type of source, the value of 10^48 erg/s, a level comparable to the most powerful blazars. The comparison of the spectral energy distribution of the NLS1 PMN J0948+0022 with that of a typical blazar - like 3C 273 - shows that the power emitted at gamma rays is extreme.Comment: 2011 Fermi Symposium proceedings - eConf C11050

Taxation in South Dakota: A Preliminary Report

The demands for tax-supported services in South Dakota are ever increasing while the tax receipts to finance such services are not increasing accordingly. The upward trend in the cost of education highway and public welfare programs are primo examples of the additional revenue requirements. Methods of financing these programs and the effect of financial policies on those paying the tax bills will be the subject of this report. Voters and state legislators need to know the effects of alternative programs for collecting and spending state revenues. In this report an attempt will be made to point out the major services that are received from taxation as well as how much these services are costing. Major emphasis will be placed on taxes pi\id by South Dakota citizens, with particular consideration given to the affects of various tax policies on the farmers. In the operation of the economic system in this country a very large percentage of the decisions made by individuals, either to buy or to sell goods or services, is left to the discretion of those buying and selling. If buyers feel that the price of a desired item is too high, they either attempt to get along without it or possibly buy a cheaper substitute# Such decision making is and has been an important factor in raising the level of living in this country. An exception to this important aspect of economic activity can be found in the field of taxation. How often do people evaluate the services they are receiving when making tax payments? Do they consider whether good tax purchase is being made cr do they feel that the product or service offered for sale is overpriced? To have a system of taxation that is thought by all taxpayers to be ono that distributes the burden of payments fairly, is an ideal probably never attainable. However a constant effort should be made to reach that goal. By so doing the inequalities that do exist can be minimized