Development of an image converter of radical design

A long term investigation of thin film sensors, monolithic photo-field effect transistors, and epitaxially diffused phototransistors and photodiodes to meet requirements to produce acceptable all solid state, electronically scanned imaging system, led to the production of an advanced engineering model camera which employs a 200,000 element phototransistor array (organized in a matrix of 400 rows by 500 columns) to secure resolution comparable to commercial television. The full investigation is described for the period July 1962 through July 1972, and covers the following broad topics in detail: (1) sensor monoliths; (2) fabrication technology; (3) functional theory; (4) system methodology; and (5) deployment profile. A summary of the work and conclusions are given, along with extensive schematic diagrams of the final solid state imaging system product

The APM Survey for Cool Carbon Stars in the Galactic Halo - II The Search for Dwarf Carbon Stars

We present proper motion measurements for carbon stars found during the APM Survey for Cool Carbon Stars in the Galactic Halo (Totten & Irwin, 1998). Measurements are obtained using a combination of POSSI, POSSII and UKST survey plates supplemented where necessary by CCD frames taken at the Isaac Newton Telescope. We find no significant proper motion for any of the new APM colour-selected carbon stars and so conclude that there are no dwarf carbon stars present within this sample. We also present proper motion measurements for three previously known dwarf carbon stars and demonstrate that these measurements agree favourably with those previously quoted in the literature, verifying our method of determining proper motions. Results from a complimentary program of JHK photometry obtained at the South African Astronomical Observatory are also presented. Dwarf carbon stars are believed to have anomalous near-infrared colours, and this feature is used for further investigation of the nature of the APM carbon stars. Our results support the use of JHK photomtery as a dwarf/giant discriminator and also reinforce the conclusion that none of the new APM-selected carbon stars are dwarfs. Finally, proper motion measurements combined with extant JHK photometry are presented for a sample of previously known Halo carbon stars, suggesting that one of these stars, CLS29, is likely to be a previously unrecognised dwarf carbon star.Comment: 13 pages, 5 figures, accepted for publication in MNRAS, Also available at http://www.astro.keele.ac.uk/~ejt/publications.htm

Using Regression Discontinuity Design to Identify the Effect of Zoning

We test the effect of minimum lot zoning on rural-to-urban land use conversion using Regression Discontinuity Design (RDD), a technique that exploits natural discontinuities in the data to identify causal effects. Observations are drawn from either size of a discontinuous minimum lot size zoning boundary. Using these selected sub-samples, a binary discrete choice model of residential land use change is estimated using parcel-level data and other spatially explicit data from an exurban county that lies on the fringes of Cleveland, Ohio. Results show that controlling for unobserved correlation in the data clearly identifies a negative and significant effect of larger minimum lot size zoning on the probability of conversion to a residential use.Land Economics/Use,

THE VALUE OF CLEAN DAIRY AIR: ACCOUNTING FOR ENDOGENEITY AND SPATIALLY CORRELATED ERRORS IN A HEDONIC ANALYSES OF THE IMPACT OF ANIMAL OPERATIONS ON LOCAL PROPERTY VALUES

We study the effect of livestock operations on property values using a hedonic analysis in five Ohio townships. Unlike previous studies, we account for endogenous livestock location variables and spatially correlated errors. Results suggest failure to correct for these problems results in biased estimates of livestock impacts on property values.Land Economics/Use,

A photometric and astrometric investigation of the brown dwarfs in Blanco 1

We present the results of a photometric and astrometric study of the low mass stellar and substellar population of the young open cluster Blanco 1. We have exploited J band data, obtained recently with the Wide Field Camera (WFCAM) on the United Kingdom InfraRed Telescope (UKIRT), and 10 year old I and z band optical imaging from CFH12k and Canada France Hawaii Telescope (CFHT), to identify 44 candidate low mass stellar and substellar members, in an area of 2 sq. degrees, on the basis of their colours and proper motions. This sample includes five sources which are newly discovered. We also confirm the lowest mass candidate member of Blanco 1 unearthed so far (29MJup). We determine the cluster mass function to have a slope of alpha=+0.93, assuming it to have a power law form. This is high, but nearly consistent with previous studies of the cluster (to within the errors), and also that of its much better studied northern hemisphere analogue, the Pleiades.Comment: 8 Pages, 5 Figures, 2 Tables and 1 Appendix. Accepted for publication in MNRA

Katrina, Rita, and the Failure of Imagination

Americans have had to deal with disaster preparedness for decades, anticipating events such as industrial accidents, power plant meltdowns, natural disasters, and nuclear attacks. Since September 11, 2001, the nation has spent unprecedented resources, created new federal, state, and local agencies, and greatly intensified efforts to prepare for catastrophes. But when Hurricane Katrina hit, we were unable to respond in an organized and comprehensive manner. Hurricane Rita gave us a chance to correct some of our mistakes. But there was a series of additional flagrant missteps. It is obvious that we need to reexamine our most basic assumptions about planning for catastrophic events

Population Vulnerabilities, Preconditions, and the Consequences of Disasters

In a perfect illustration of our nation's proclivity for postevent crisis response and our resistance to longer term planning and system investment, the nation put a rush order on developing a massive bureaucracy designed to fast track new systems for preventing and responding to terrorism and large scale natural disasters. FEMA and many other agencies were incorporated into the new Department of Homeland Security, billions of dollars were appropriated and, seemingly, a substantial focus on disaster prevention and management was emerging in the aftermath of the attacks on the World Trade Center in New York City. What actually materialized, however, in the frantic push to create new systems, has, so far, failed to provide credible, cost-effective, evidence-based systems of disaster preparedness and response. Overall, I suspect that the government efforts spurred on by the attacks of 9/11 represent not only an extraordinary level of spending, but also a lack of accountability that is virtually unprecedented in recent US history. In fact, after watching—and working among—the efforts to respond effectively to the disasters precipitated by Hurricanes Katrina and Rita, and the subsequent flooding of New Orleans, it is clear that much needs to be done in all aspects of this field. But perhaps no challenge is more pressing than coming to grips with the realities facing families whose "disaster risk profile" is exacerbated by vulnerabilities that include long-term income fragility, social marginalization, or chronic illness

Overcoming barriers to health care access for medically underserved children

Many children in the United States face serious challenges in seeking appropriate medical care, including lack of insurance coverage, linguistic and social barriers, geographic isolation, and localized shortages of health personnel. This article reviews the New York Children's Health Project (NYCHP), outlining the planning and implementation of a mobile service delivery model for pediatric care that can be adopted to help underserved children elsewhere in the United States

Are our children terrorist targets?

Are U.S. children potential terror targets? While such a notion is almost impossible to contemplate, evidence increasingly suggests that U.S. intelligence efforts must be alert to this horrific possibility and that schools and first-responders should have appropriate emergency plans

Are We Ready Yet to Deal with Large-Scale Disasters?

What seems to be abundantly clear, however, is that the United States is still not where it should be in terms of the general response capacity following major disasters, whatever their cause. Part of the problem is unchanged from last year. We will have not defined what we mean by "prepared" whether we are speaking of this concept on a national or local level. Not that this is in any way easy. The concept of preparedness or readiness is understood to be arbitrarily determined, so that it is always possible to under or over-prepare for future disasters. No two major events are exactly the same and the consequences can encompass a relatively wide range. That is precisely why it is essential for appropriate officials - particularly on the federal level - to establish criteria for what it means for the nation and for communities to be sufficiently prepared. That definition should take into account the major threats that the U. S. faces, guidelines for appropriate planning on a regional basis and, ultimately, an arbitrary decision with respect to much will be spent on preparing