Understanding Something About Nothing: Radiation Zeros

Radiation symmetry is briefly reviewed, along with its historical, experimental, computational, and theoretical relevance. A sketch of the proof of a theorem for radiation zeros is used to highlight the connection between gauge-boson couplings and Poincare transformations. It is emphasized that while mostly bad things happen to good zeros, the weak-boson self-couplings continue to be intimately tied to the best examples of exact or approximate zeros.Comment: 12 pages, revtex. Two minor figures can be obtained by request; to appear in the Proceedings of the International Symposium on Vector Boson Self-Interactions, UCLA, Feb. 1-3, 199

NASA's educational programs

The educational programs of NASA's Educational Affairs Division are examined. The problem of declining numbers of science and engineering students is reviewed. The various NASA educational programs are described, including programs at the elementary and secondary school levels, teacher education programs, and undergraduate, graduate, and university faculty programs. The coordination of aerospace education activities and future plans for increasing NASA educational programs are considered

KLT-type relations for QCD and bicolor amplitudes from color-factor symmetry

Color-factor symmetry is used to derive a KLT-type relation for tree-level QCD amplitudes containing gluons and an arbitrary number of massive or massless quark-antiquark pairs, generalizing the expression for Yang-Mills amplitudes originally postulated by Bern, De Freitas, and Wong. An explicit expression is given for all amplitudes with two or fewer quark-antiquark pairs in terms of the (modified) momentum kernel. We also introduce the bicolor scalar theory, the "zeroth copy" of QCD, containing massless biadjoint scalars and massive bifundamental scalars, generalizing the biadjoint scalar theory of Cachazo, He, and Yuan. We derive KLT-type relations for tree-level amplitudes of biadjoint and bicolor theories using the color-factor symmetry possessed by these theories.Comment: 24 pages, 2 figures; v2: added referenc

Overview of multi-input frequency domain modal testing methods with an emphasis on sine testing

An overview of the current state of the art multiple-input, multiple-output modal testing technology is discussed. A very brief review of the current time domain methods is given. A detailed review of frequency and spatial domain methods is presented with an emphasis on sine testing

Bridging The Gap: Intergenerational Perceptions Towards Professional Usage of Social Networking Websites

The purpose of this study was to identify the perception gap between Generation Y and older generations with regard to Social Networking Sites (SNS). Particular emphasis was placed upon applications within a professional setting. An overview of the generation gap and other phenomena provided the theoretical framework towards addressing this issue. An empirical study was conducted, with two separate surveys employed (one for Faculty and one for Undergraduates) to answer the following question: Do different generations perceive the same “value” to Social Networking Websites? Responses gathered from Undergraduates/Faculty at the University of Maine, Orono helped to answer this question. Results provided new insight into intergenerational perceptions of SNS use within the workplace, along with viable avenues for future implementation. Keywords: Social Networking, SN

Development of a DME Simulator

This report summarizes the design of a DME (Distance Measuring Equipment) simulator to be used in the testing of an Area Navigation System. The purpose of the simulator is to generate a signal representing an aircraft\u27s distance from a ground station. This information is in the form of two pulses whose separation represents that elapsed transmission time for an aircraft to receive a reply from the ground station to an interrogation by the aircraft. The pulse spacing must be selectable as fixed distances for static tests and as distance changing at a constant rate to simulate flying to or from the station for dynamic testing. Thumbwheel switches are used to input fixed distances and up/down counters provide inbound and outbound range rates. The rate clock is derived from a crystal oscillator whose output is divided down by a programmable, modulo-n, divider to the desired rate/frequency. This input distance information, available in parallel binary coded decimal format, is then converted to the required pulse pair spacing. This is accomplished with presettable down counters clocked by another crystal oscillator whose frequency represents two-way propagation time for radio waves

An image-capable interprocessor link communications protocol

Image-capable interprocessor links often require the use of specialized communications protocols due to the large amounts of data that can be transmitted and the high speeds at which the data can be transferred. Without a set of generalized image-capable communications rules, these protocols are commonly customized to each interprocessor link application. The image-capable interprocessor link communications protocol described in this paper (IPLIMP) has been designed to limit the need for such customization at a low level. In order to accomplish this, IPLIMP provides simple methods for synchronizing and controlling link operations, sending and receiving data, downloading additional protocol layers, and communicating with higher level services. By providing this basic set of functions with minimized overhead, IPLIMP can be used as a fundamental building block for numerous image-capable interprocessor link applications. In this manner, a common basis for image communications is developed, thereby ensuring at least a low level degree of compatibility

Anisotropic focusing characteristics of micro-domain structures within crystalline Sr_0.61Ba_0.39Nb₂O₆ : the crystal ball

We report the anisotropic focusing characteristics of a spherically configured region of micro-domains that have been induced within a cubic shaped crystal of Ce:doped Sr0.61Ba0.39Nb2O6. The internal spherical structure focuses extraordinary polarised light, but not ordinary polarised. The spherical region, which is easily observed via scattering, is formed as the crystal cools down, after a repoling cycle through the Curie temperature, with an applied field. Analytic modelling of the thermal gradients that exist within the crystal during cooling reveals a small (< 1°) temperature difference between the central and outside regions. The similarity in shape between these temperature profiles and the observed scattering region suggests a possible mechanism for the growth of this spherical micro-domained structure

Ridge Production in High-Multiplicity Hadronic Ultra-Peripheral Proton-Proton Collisions

An unexpected result at the RHIC and the LHC is the observation that high-multiplicity hadronic events in heavy-ion and proton-proton collisions are distributed as two "ridges", approximately flat in rapidity and opposite in azimuthal angle. We propose that the origin of these events is due to the inelastic collisions of aligned gluonic flux tubes that underly the color confinement of the quarks in each proton. We predict that high-multiplicity hadronic ridges will also be produced in the high energy photon-photon collisions accessible at the LHC in ultra-peripheral proton-proton collisions or at a high energy electron-positron collider. We also note the orientation of the flux tubes between the quark and antiquark of each high energy photon will be correlated with the plane of the scattered proton or lepton. Thus hadron production and ridge formation can be controlled in a novel way at the LHC by observing the azimuthal correlations of the scattering planes of the ultra-peripheral protons with the orientation of the produced ridges. Photon-photon collisions can thus illuminate the fundamental physics underlying the ridge effect and the physics of color confinement in QCD.Comment: Presented by SJB at Photon 2017: The International Conference on the Structure and the Interactions of the Photon and the International Workshop on Photon-Photon Collisions. CERN, May 22-26, 2017. References adde

Paper Session I-B - The Real Space Tourism Industry

In the entire world, there are numerous space launch sites, but only one in which the casual visitor can go with any real expectation of watching a space launch: Cape Canaveral Other launch sites are simply too inaccessible, have too low a launch rate, or are geographically configured so as to make launch viewing highly difficult. In contrast to other sites, Florida’s Cape Canaveral has a nearby thriving tourist industry, superb multi-modal transportation facilities, and is laid out in a manner that enables viewing. However, while people do vacation in the Cocoa Beach area with at least some hope of seeing a launch, this fact is not treated as big factor at present. Launch viewing is not particularly encouraged or enabled. From the launch industry standpoint, facilitating launch viewing is more a nuisance than a source of pride. In terms of safety, launch viewing is a concern because of the concentrations of uncontrolled personnel. For the local communities, the traffic associated with launch viewing can be a major stressor of the road network. The biggest problem is one of information. We need a better system of letting the public know of launch viewing opportunities, one that does not rely on just newspapers or the internet. We need a better way of providing real time information on the status of the launch operation, both to facilitate viewing and to convey the excitement of the process. Modern communications systems offer inexpensive means of achieving these goals. By taking a new approach to enabling launch viewing, the launch and tourism industries can complement one another and the local economy. Launches can be both a more effective tourist attraction and a clear source of pride for the community. At the same time, safety can be improved and the traffic situation handled more efficiently. This paper deals with an approach to address this current issue and potential resource