We analyze ultraviolet (∼ 1500 Å) images of the old open clusters M67, NGC 188, and NGC 6791 obtained with Ultraviolet Imaging Telescope (UIT) during the second flight of the Astro observatory in March 1995. Twenty stars are detected on the UIT image of M67, including 11 blue stragglers, seven white dwarf candidates, and the yellow giant – white dwarf binary S1040. The ultraviolet photometry of...

We present analytical approximations for calculating the scattering, absorption and escape of non-ionizing photons from a spherically symmetric two-phase clumpy medium, with either a central point source of isotropic radiation, a uniform distribution of isotropic emitters, or uniformly illuminated by external sources. The analytical approximations are based on the mega-grains model of two-phase...

The Spectro-Radiometric Calibration Assembly (SRCA) provides on-orbit spectral calibration of the MODerate resolution Imaging Spectroradiometer (MODIS) reflected solar bands and this paper describes how it is accomplished. The SRCA has two adjacent exit slits: 1) Main slit and 2) Calibration slit. The output from the main slit is measured by a reference silicon photo-diode (SiPD) and then passe...

We present a framework for non-asymptotic analysis of real-world multi-hop wireless networks that captures protocol overhead, congestion bottlenecks, traffic heterogeneity and other real-world concerns. The framework introduces the concept of symptotic 1 scalability to determine the number of nodes to which a network scales, and a metric called change impact value (CIV) for comparing the impact...

This thesis investigates how the formal modeling and veri cation techniques of computer science can be used for the analysis of hybrid systems [7,14,22,37]| systems involving both discrete and continuous behavior. The motivation behind such research lies in the inherent similarity of the hierarchical and decentralized control strategies of hybrid systems and the communication and operation prot...

Covert communication conceals the transmission of the message from an attentive adversary. Recent work on the limits of covert communication in additive white Gaussian noise (AWGN) channels has demonstrated that a covert transmitter (Alice) can reliably transmit a maximum of O ( √ n) bits to a covert receiver (Bob) without being detected by an adversary (Warden Willie) in n channel uses. This p...

Forty two years I've been in the ministry. Seen a lot of things. Do you know what I've noticed? Christianity is trendy. Especially in this country where everyone follows the winds of change to exploit change. Here is what I've noted. 1. Crusades and mass meetings: These were in the 50's and 60's. (Before me, mind you.) Billy Graham made them famous but this was the American means of educational...

A stimulation by phenazine methosulfate (PMS) of photophosphorylation with extracts of Rhodospirillum rubrum was first reported by Geller and Gregory,' who at the same time presented spectroscopic evidence that PMS was oxidized during the reaction. Jagendorf and Avron2 subsequently reported that PMS serves as a cofactor for cyclic photophosphorylation in chloroplasts, and considerable interest ...

Some of the main objectives of quality assurance practices are to detect and correct the errors that arise during the development of a software product, as well as to guarantee that the final product conforms to the client’s requirements. Quality initiatives suppose an added cost to the software development projects, cost that is totally justified but which, in most of the cases, is the first o...

While the proliferation of Russia's top tier SAMs into the Asian market has been dominated by Chinese large volume purchases, with India still negotiating, we are now seeing a second wave of 'me too' buys by smaller nations intent on matching their larger neighbours. Without the attached political strings of US equipment, and often much cheaper than US equivalents, top tier Russian products oft...