Computer animation of NASTRAN displacements on IRIS 4D-series workstations: CANDI/ANIMATE postprocessing of NASHUA results

The capabilities of the postprocessing program CANDI (Color Animation of Nastran DIsplacements) were expanded to accept results from axisymmetric analysis. An auxiliary program, ANIMATE, was developed to allow color display of CANDI output on the IRIS 4D-series workstations. The user can interactively manipulate the graphics display by three-dimensional rotations, translations, and scaling through the use of the keyboard and/or dials box. The user can also specify what portion of the model is displayed. These developments are limited to the display of complex displacements calculated with the NASHUA/NASTRAN procedure for structural acoustics analysis

Image gathering, coding, and processing: End-to-end optimization for efficient and robust acquisition of visual information

Researchers are concerned with the end-to-end performance of image gathering, coding, and processing. The applications range from high-resolution television to vision-based robotics, wherever the resolution, efficiency and robustness of visual information acquisition and processing are critical. For the presentation at this workshop, it is convenient to divide research activities into the following two overlapping areas: The first is the development of focal-plane processing techniques and technology to effectively combine image gathering with coding, with an emphasis on low-level vision processing akin to the retinal processing in human vision. The approach includes the familiar Laplacian pyramid, the new intensity-dependent spatial summation, and parallel sensing/processing networks. Three-dimensional image gathering is attained by combining laser ranging with sensor-array imaging. The second is the rigorous extension of information theory and optimal filtering to visual information acquisition and processing. The goal is to provide a comprehensive methodology for quantitatively assessing the end-to-end performance of image gathering, coding, and processing

Spatial frequency response of an optical heterodyne receiver

The principles of transfer function analysis are applied to a passive optical heterodyne receiver to obtain the modulation transfer function (MTF). MTF calculations are performed based on an optical platform which is imaging vertically varying profiles at worst case shuttle orbit altitudes. An analysis of the derogatory effects of sampling (aliasing) and central obscurations on both resolution and heterodyne efficiency is given. It is found that the cascading property of MTF analysis must be carefully applied since the coherent transfer function of the optical receiver and that due to the local oscillator-detector combination are not separable but are related by the convolution of their products. Application of these results to the specific case of a space-lab type optical heterodyne receiver shows that resolutions of the order of 1.5-2.0 Km are possible for worst-case type orbital scenarios. Further, comparison of obscured-type receivers (e.g., Cassegrains) with unobscured receivers shows that both resolution and efficiency are severely degraded in an obscured-type receiver and consequently should not be used for a passive heterodyne detection scheme

A Comparison of Compensation for Nationalization of Alien Property with Standards of Compensation under United States Domestic Law

This Article will attempt to show that, despite much scholarly disparagement of the traditional prompt, adequate and effective standard of compensation for expropriation, when put to the test of deciding actual cases through arbitration, international law produces results not dissimilar from what might be expected under the standard. The Article compares the law of damages in international arbitration with United States domestic law and points out their similarities

Safe Harbors: A Comparative Analysis of Dredging Regulation in New England

Searsport is home to the second-busiest industrial port in Maine. Imports include heating oil and road salt and come from as far away as Africa. Situated at the mouth of the Penobscot River and linked to northern Maine and Montreal by rail, Searsport’s Mack Point Marine Intermodal Cargo Terminal (hereinafter “Mack Point”) is a significant international trade hub and source of jobs in Maine’s Midcoast Region. Since 2000, a plan to deepen the harbor around Mack Point has stalled. Supporters of the plan, including business groups, argue that deepening the harbor, or dredging, is necessary to increase and streamline the flow of cargo to the port. Opponents, however, like lobstermen and environmentalists, are concerned about the potential consequences of dumping large amounts of dredged sediment into Penobscot Bay; especially when that sediment may be contaminated by mercury, creosote (a known carcinogen), and other harmful pollutants. After fifteen years, the uncertainty surrounding the dredging of Mack Point has created disharmony in Maine communities and hindered stakeholders’ ability to plan for the future. Prompted by the important environmental and economic issues at stake in the Mack Point dredging project, as well as the absence of finality that does a disservice to both sides in the debate, this Comment explores the regulatory framework in which dredging occurs in coastal New England with an eye toward improving Maine’s dredging laws. As a foundation for later discussion, Part II offers a primer on the dredging process. Part III summarizes federal dredging laws and touches on the disposal of dredged material. Part IV discusses selected dredging laws in Connecticut, Rhode Island, Massachusetts, New Hampshire, and Maine for comparison purposes. Part V concludes with analysis and recommendations for Maine’s dredging laws

Proton-radiation damage in Gunn oscillators

The irradiation effects of 22 MeV protons on the electrical characteristics of GaAs continuous-wave Gunn oscillators was studied. The radio frequency power output was reduced by 3 decibels at proton fluences in the neighborhood of 1.5 x 10 to the 12th power protons/sq cm. Conductance measurements indicate that the carrier removal rate at high electric fields remained roughly 40 percent less than at low fields. Diode efficiencies of two device groups were found to be monotonically descreasing functions of fluence. Frequency modulation noise was generally unaffected by radiation, but the magnitude of the noise in the noise power spectrum increased significantly. These effects are partially accounted for, in a qualitative fashion, by a model of electron traps having field-dependent net-carrier capture rates and various response times

An Exploratory Study into Empowering Grade 10 and 11 Learners through Critical Engagement with South African Literature: A Case Study in Cato Manor

This qualitative research project explores how critical engagement with Black South- African authored literature empowers the voices of grade 10 and 11 students in the Cato Manor township of South Africa. Located within a Freirean educational framework, this research utilizes a critical pedagogy approach to empower student voices through representation in texts, deconstruction of a knowledge hierarchy, problem-posing pedagogy, and exposure to themes of racial pride and self-agency in selected literature. This study employs a general qualitative design paradigm consisting of engagement with 3 focus groups of 10-11 learners spanning grades 10 and 11 in Cato Manor public secondary schools. The researcher utilizes participatory observation and facilitation to implement self-created lesson plans of reading and discussing chosen texts with the learners. This data concludes that through empowering book selections and intentional culture creation, students use relatable literature to vulnerably express challenges faced in the township, critically debate philosophical themes, and experience encouragement through dialogue of texts. This research advocates for greater access to Black South African authored literature for adolescence to increase benefits seen in critical thinking, connection to peers, and self-confidence