scholarly journals The Mark IIIA Correlator System

1988 ◽  
Vol 129 ◽  
pp. 503-504
Author(s):  
Alan R. Whitney
Keyword(s):  
Spectral Line ◽  
Data Processing ◽  
Recent Work ◽  
Modular Design ◽  
Low Cost ◽  
Computer Support ◽  
Vlbi Observations ◽  
Naval Observatory ◽  
Internal Modelling ◽  
The U.S

The Mark IIIA correlator system, developed at Haystack Observatory, is a second-generation version of the original Mark III correlator which adds significant new capabilities, such as double-speed operation, longer integration periods, and improved internal modelling. One Mark IIIA correlator is currently operational at the U.S. Naval Observatory in Washington, D.C., and another is being readied to replace the Mark III correlator at Haystack.The Mark IIIA correlator can simultaneously process up to 10 baselines of 24-MHz BW data from 5 stations. Experiments including more than 5 stations may be processed with multiple passes through the correlator. The architecture of the correlator allows a future expansion to a maximum of 16 stations. Due to a simple modular design and the low cost of required computer-support equipment, expansion is straightforward and relatively economical.Both astronomy and geodetic data processing are supported by the Mark IIIA system, including spectral line and pulsar gating. In addition, recent work has led to support of space-based VLBI observations; this capability was critical in supporting the first successful space-based VLBI astronomy observations between ground-based antennas and an orbiting satellite in August 1986.

Retrospective on the 1970’s “Low Cost Shore Protection” program

Shore & Beach ◽  
2019 ◽  
pp. 3-12
Author(s):  
Joan Pope
Keyword(s):  
Coastal Erosion ◽  
Low Cost ◽  
Management Strategies ◽  
Public Information ◽  
Coastal Engineering ◽  
Shoreline Erosion ◽  
Shore Protection ◽  
Demonstration Program ◽  
Alternative Approaches ◽  
The U.S

In the 1970s, the U.S. Congress authorized and funded a five-year demonstration program on low-cost methods for shore protection called the “U.S. Army Engineers Shoreline Erosion Control Demonstration (Section 54) Program.” The Section 54 also known as the “Low-Cost Shore Protection” demonstration program is revisited. Demonstration and monitoring sites including the materials, devices, vegetative plantings, approaches tested, and program findings are discussed. Simply put, a major finding of the Section 54 program was that the concept of “low-cost shore protection” was a bit naïve. However, the program did lead to a wealth of public information documents and practical coastal engineering lessons that are still resonating as home owners, communities, and engineers consider alternative approaches for managing coastal erosion. The program structure and findings are applicable 40 years later as consideration is given toward the use of Natural and Nature-based Features (NNBF) for addressing coastal erosion. Evolution in thought relative to coastal erosion and shoreline enhancement activities since the 1970s has built upon many of the lessons and concepts of the Section 54 program and other real-world coastal erosion management success-failure experiences. This growth has led to a modern appreciation that those features that emulate NNBF are promising and responsible alternative coastal erosion management strategies if proper engineering standard elements of design are included in the project.

The Troubled Inheritance: The National Security Agency and the Obama Administration

2010 ◽  
pp. 241-256
Author(s):  
Matthew M. Aid
Keyword(s):  
Data Processing ◽  
National Security ◽  
Bush Administration ◽  
Intelligence Community ◽  
National Security Agency ◽  
Obama Administration ◽  
Policy Issues ◽  
The U.S ◽  
The Coordinator ◽  
Signals Intelligence

This article discusses the National Security Agency under the Obama Administration. Upon his inauguration on January 20, 2009, Obama inherited from the Bush administration an intelligence community embroiled in political controversies. Of the sixteen agencies of the intelligence community, the National Security Agency (NSA) faced the greatest scrutiny from the new Obama administration and the Congress. NSA was the largest and the most powerful member of the U.S. intelligence community. Since its formation in 1952, NSA has managed and directed all U.S. government signals intelligence (SIGINT) collection. It is the collector and processor of communications intelligence (COMINT) and the primary processor of foreign instrumentation signals intelligence (FISINT). And since 1958, NSA has been the coordinator of the U.S. government's national electronics intelligence (ELINT) program. It has also the task of overseeing the security of the U.S. government's communications and data processing systems, and since the 1980s, NSA has managed the U.S. government's national operation security (OPSEC) program. In this article, the focus is on the challenges faced by the NSA during the Bush administration; the role played by the NSA during the wars in Afghanistan and Iraq; and the challenges faced by the Obama administration in confronting a series of thorny legal and policy issues relating to NSA's eavesdropping program.

Peculiarities of Maser Data Correlation / Postcorrelation in Radioastron Mission

2017 ◽  
Vol 13 (S336) ◽  
pp. 443-444
Author(s):  
I. D. Litovchenko ◽  
S. F. Likhachev ◽  
V. I. Kostenko ◽  
I. A. Girin ◽  
V. A. Ladygin ◽  
...  
Keyword(s):  
Spectral Line ◽  
Data Processing ◽  
Detection Rate ◽  
Angular Size ◽  
Data Archive ◽  
Data Correlation ◽  
Raw Data ◽  
Unique Data ◽  
Technical Requirements ◽  
Upper Limits

AbstractWe discuss specific aspects of space-ground VLBI (SVLBI) data processing of spectral line experiments (H2O & OH masers) in Radioastron project. In order to meet all technical requirements of the Radioastron mission a new software FX correlator (ASCFX) and the unique data archive which stores raw data from all VLBI stations for all experiments of the project were developed in Astro Space Center. Currently all maser observations conducted in Radioastron project were correlated using the ASCFX correlator. Positive detections on the space-ground baselines were found in 38 sessions out of 144 (detection rate of about 27%). Finally, we presented upper limits on the angular size of the most compact spots observed in two galactic H2O masers, W3OH(H2O) and OH043.8-0.1.

Concept to Support the Flexibility of Manufacturing System through Reconfigurable Structure Based on Modular Design

2015 ◽  
Vol 816 ◽  
pp. 536-546
Author(s):  
Vladimír Rudy ◽  
Andrea Lešková
Keyword(s):  
Flexible Manufacturing ◽  
Manufacturing Systems ◽  
Structural Changes ◽  
Modular Design ◽  
Production Systems ◽  
Low Cost ◽  
Modular Construction ◽  
Production Platform ◽  
Flexible Adaptation ◽  
Reconfigurable Structure

This article deals about the challenges of structural changes in manufacturing conditions. The objective of this paper is to present the modular workstations concept based on miniaturization and re-configurability trends. The article is aimed at problems of designing of production systems with a modular construction structure. The modular structure allows an individual and flexible adaptation to varying requirements but also the realization of low-cost solutions for creation of new or modernized production base. The goal is to present the example of modular workstations solutions that correspond with new designing approach. The specification of basics principles, which should help to designing flexible manufacturing systems, discussed in this paper are: modularity; integrability; convertibility; diagnosability; customization. The theoretical part provides an overview of fundamental design principles in manufacturing structures. In the first part of this article are discussed the specification of basic flexibility types in production system and the main impacts influencing design of manufacturing structures. The closing section of the article provides the specification of example solution of adjustable production platform with modular frame (called desktop factory).

scholarly journals A Cotton Module Feeder Plastic Contamination Inspection System

2020 ◽  
Vol 2 (2) ◽  
pp. 280-293
Author(s):  
Mathew G. Pelletier ◽  
Greg A. Holt ◽  
John D. Wanjura
Keyword(s):  
Mechanical Design ◽  
Low Cost ◽  
Processing System ◽  
Technical Note ◽  
Inspection System ◽  
Learning Program ◽  
Cotton Lint ◽  
Cotton Industry ◽  
Bill Of Materials ◽  
The U.S

The removal of plastic contamination in cotton lint is an issue of top priority to the U.S. cotton industry. One of the main sources of plastic contamination showing up in marketable cotton bales, at the U.S. Department of Agriculture’s classing office, is plastic from the module wrap used to wrap cotton modules produced by the new John Deere round module harvesters. Despite diligent efforts by cotton ginning personnel to remove all plastic encountered during unwrapping of the seed cotton modules, plastic still finds a way into the cotton gin’s processing system. To help mitigate plastic contamination at the gin; an inspection system was developed that utilized low-cost color cameras to see plastic on the module feeder’s dispersing cylinders, that are normally hidden from view by the incoming feed of cotton modules. This technical note presents the design of an automated intelligent machine-vision guided cotton module-feeder inspection system. The system includes a machine-learning program that automatically detects plastic contamination in order to alert the cotton gin personnel as to the presence of plastic contamination on the module feeder’s dispersing cylinders. The system was tested throughout the entire 2019 cotton ginning season at two commercial cotton gins and at one gin in the 2018 ginning season. This note describes the over-all system and mechanical design and provides an over-view and coverage of key relevant issues. Included as an attachment to this technical note are all the mechanical engineering design files as well as the bill-of-materials part source list. A discussion of the observational impact the system had on reduction of plastic contamination is also addressed.

scholarly journals A downward buoyant force experiment

2014 ◽  
Vol 36 (2) ◽  
Author(s):  
F.M.S. Lima ◽  
G.M. Venceslau ◽  
G.T. Brasil
Keyword(s):  
Recent Work ◽  
Common Sense ◽  
Low Cost ◽  
The Body ◽  
Buoyant Force ◽  
Rectangular Block ◽  
Counterintuitive Result

In hydrostatics, the Archimedes principle predicts an upward force whenever a body is submerged in a liquid. In contrast to common sense, this physical law is not free of exceptions, as for example when the body touches the container. This is more evident when a rectangular block less dense than the liquid rests on the bottom, with no liquid underneath it, a case in which a downward force is expected, according to a recent work by the first author. In the present work, we describe a simple, low-cost experiment which allows the detection of such force. This counterintuitive result shows the inadequacy of Archimedes' principle for treating "contact" cases.

scholarly journals Learning from Past Policy: Assessing United States Foreign Policy over Indonesia in Resolving the 1999 East Timor Crisis

2021 ◽  
Vol 23 (1) ◽  
pp. 1
Author(s):  
Sigit S. Nugroho
Keyword(s):  
United States ◽  
Foreign Policy ◽  
Low Cost ◽  
The United States ◽  
East Timor ◽  
United States Foreign Policy ◽  
Case Study Analysis ◽  
High Degree ◽  
The U.S

Assessing the output of past foreign policy is instrumental for any country to learn policy-relevant insights, to appreciate its experience, and to improve its future conduct. To glean such insights, this article borrows Baldwin’s framework in assessing the success and failure in foreign policy. Using a case study analysis, it assesses the United States’ (U.S.) influence attempt towards Indonesia to resolve the 1999 East Timor humanitarian crisis. President Clinton’s decision to undergo an influence attempt primarily aimed to change Indonesia’s policy while gaining support from U.S. allies in the process. The article finds that Clinton’s decision was a highly successful attempt. This finding is based on several factors: (1) the attempt effectively attained the intended primary and secondary goals at a considerably high degree; (2) it was conducted at a considerably low cost for the U.S.; (3) it inflicted a high cost towards Indonesia; (4) the increase in Clinton’s stake strengthened the U.S. resolve to pursue the influence attempt; and (5) Clinton had successfully overcome the difficult undertaking as Indonesia possessed higher stake over East Timor. These findings provide some lessons for both U.S. and Indonesian foreign policymakers to chart future relations for the two nations.

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