scholarly journals Technical Considerations in the Development of a Maritime Gas-Cooled Reactor System

1961 ◽  
Author(s):  
Bernard T. Resnick
Keyword(s):  
Axial Flow ◽  
Beryllium Oxide ◽  
Current Status ◽  
Closed Cycle ◽  
Design Development ◽  
Power Cycle ◽  
Low Pressure Turbine ◽  
Reactor Technology ◽  
Nuclear Propulsion ◽  
Speed Reducer

The Maritime gas-cooled-reactor concept is a closed-cycle nuclear propulsion system in the 20,000-shp range. The power cycle consists of a beryllium-oxide, helium-cooled reactor, directly coupled to a closed-cycle axial-flow, split turbine. The high-pressure turbine drives the directly connected helium compressors. The low-pressure turbine drives the propeller shaft through a suitable speed reducer. Problems relating to the design development of principal plant components and systems, and the current status of turbomachinery and reactor technology are discussed.

Measurements of Secondary Losses in a Turbine Cascade With the Implementation of Nonaxisymmetric Endwall Contouring

2009 ◽  
Vol 132 (1) ◽  
Author(s):  
D. C. Knezevici ◽  
S. A. Sjolander ◽  
T. J. Praisner ◽  
E. Allen-Bradley ◽  
E. A. Grover
Keyword(s):  
Kinetic Energy ◽  
Axial Flow ◽  
Surface Flow ◽  
Secondary Flows ◽  
Test Facility ◽  
Suction Surface ◽  
Blade Passage ◽  
Low Pressure Turbine ◽  
Endwall Contouring ◽  
Pressure And Velocity Measurements

An approach to endwall contouring has been developed with the goal of reducing secondary losses in highly loaded axial flow turbines. The present paper describes an experimental assessment of the performance of the contouring approach implemented in a low-speed linear cascade test facility. The study examines the secondary flows of a cascade composed of Pratt & Whitney PAKB airfoils. This airfoil has been used extensively in low-pressure turbine research, and the present work adds intrapassage pressure and velocity measurements to the existing database. The cascade was tested at design incidence and at an inlet Reynolds number of 126,000 based on inlet midspan velocity and axial chord. Quantitative results include seven-hole pneumatic probe pressure measurements downstream of the cascade to assess blade row losses and detailed seven-hole probe measurements within the blade passage to track the progression of flow structures. Qualitative results take the form of oil surface flow visualization on the endwall and blade suction surface. The application of endwall contouring resulted in lower secondary losses and a reduction in secondary kinetic energy associated with pitchwise flow near the endwall and spanwise flow up the suction surface within the blade passage. The mechanism of loss reduction is discussed in regard to the reduction in secondary kinetic energy.

scholarly journals Compact Cryogenic Receivers for the 1.3 to 43 GHz Range

1988 ◽  
Vol 129 ◽  
pp. 499-500
Author(s):  
S. Weinreb ◽  
R. Norrod ◽  
M. W. Pospieszalski
Keyword(s):  
High Electron Mobility Transistor ◽  
Low Noise ◽  
Current Status ◽  
High Electron ◽  
Light Weight ◽  
Closed Cycle ◽  
High Electron Mobility ◽  
Dual Channel ◽  
Long Baseline ◽  
Very Long Baseline Array

A series of front-ends utilizing small closed-cycle refrigerators and very low-noise, high-electron-mobility transistor (HEMT) amplifiers have been developed for use in the Very Long Baseline Array (VLBA). The frequency bands, amplifier noise temperatures, expected system temperatures, and current status are shown in Table I. The receivers are designed to be light weight (∼ 55 pounds except for 105 pounds at 1.5 GHz) for ease of installation and maintenance, are easily remotely controlled and monitored, and provide dual-channel circular polarization capability. Detailed descriptions of some of the front-ends are given in VLBA technical reports.

scholarly journals Review of supercritical CO2 power cycle technology and current status of research and development

2015 ◽  
Vol 47 (6) ◽  
pp. 647-661 ◽  
Author(s):  
Yoonhan Ahn ◽  
Seong Jun Bae ◽  
Minseok Kim ◽  
Seong Kuk Cho ◽  
Seungjoon Baik ◽  
...  
Keyword(s):  
Research And Development ◽  
Supercritical Co2 ◽  
Current Status ◽  
Power Cycle

Design Optimisation of the Graz Cycle Prototype Plant

2003 ◽  
Author(s):  
H. Jericha ◽  
E. Go¨ttlich ◽  
W. Sanz ◽  
F. Heitmeir
Keyword(s):  
Gas Turbines ◽  
Development Work ◽  
Closed Cycle ◽  
Emission Power ◽  
Valuable Contribution ◽  
Power Cycle ◽  
Planning And Design ◽  
Operational Capabilities ◽  
University Of Technology ◽  
Zero Emission

Introduction of closed cycle gas turbines with their capability of retaining combustion generated CO2 can offer a valuable contribution to the Kyoto goal and to future power generation. The use of well established gas turbine technology enhanced by recent research results enables designers even today to present proposals for prototype plants. Research and development work of TTM Institute of Graz University of Technology since the 90’s has lead to the Graz Cycle, a zero emission power cycle of highest efficiency and with most positive features. In this work the design for a prototype plant based on current technology as well as cutting-edge turbomachinery is presented. The object of such a plant shall be the demonstration of operational capabilities and shall lead to the planning and design of much larger units of highest reliability and thermal efficiency.

Development of an experimental set-up for low-temperature spectroscopic studies of matrix-isolated molecules and molecular ices using synchrotron radiation

2018 ◽  
Vol 25 (5) ◽  
pp. 1425-1432
Author(s):  
Param Jeet Singh ◽  
K. Sundararajan ◽  
Aparna Shastri ◽  
Vijay Kumar ◽  
Asim Kumar Das ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Low Temperature ◽  
Low Temperatures ◽  
Spectroscopic Studies ◽  
Performance Criteria ◽  
Experimental Chamber ◽  
Closed Cycle ◽  
Design Development ◽  
Set Up ◽  
Ice Phase

An experimental set-up for studying photophysics and photochemistry of molecules in an inert gas medium (matrix-isolated) and in the ice phase at low temperatures has been developed and commissioned at the Photophysics beamline, Indus-1 synchrotron radiation source. This end-station uses an in-house-developed closed-cycle cryostat for achieving cryo-temperatures (∼10 K). Synchrotron radiation from the Photophysics beamline is used as the source of UV–VUV photons and the system is equipped with a Fourier transform infrared spectrometer for characterization of the molecular species formed at low temperature. Various individual components of the end-station like closed-cycle cryostat, experimental chamber, gas mixing and deposition systems are tested to ascertain that the desired performance criteria are satisfied. The performance of the composite system after integration with the Photophysics beamline is evaluated by recording IR and UV–VUV photoabsorption spectra of sulfur dioxide at low temperatures (10 K), both in the ice phase as well as isolated in argon matrices. Results obtained are in good agreement with earlier literature, thus validating the satisfactory performance of the system. As an off-shoot of the study, the VUV absorption spectrum of matrix-isolated SO2 in argon matrix up to 10.2 eV is reported here for the first time. This experimental end-station will provide new opportunities to study photon-induced reactions in molecules of environmental, astrochemical and industrial importance. Details of the design, development and initial experimental results obtained are presented.

scholarly journals Current Status and Future Outlook on Occupational Health and Safety Research in Sudan: A Concise Review

2021 ◽  
pp. 79-88
Author(s):  
Rasha A. Abdelrahim ◽  
Faris Omer ◽  
Victor O. Otitolaiye
Keyword(s):  
Occupational Health ◽  
Health And Safety ◽  
Noise Pollution ◽  
Occupational Health And Safety ◽  
Current Status ◽  
Design Development ◽  
Long Term Effects ◽  
Future Outlook ◽  
Work Related ◽  
Safety Research

The concept of occupational health and safety (OHS) describes the strategies, guidelines, and actions typically adopted and implemented to prevent, minimize or manage the risks associated with the health and safety of people and property. Over the years, the rapid growth, development and operation of various industries in developing countries have resulted in numerous accidents, injuries and illnesses. Given the short- and long-term effects of such issues, it is imperative to identify, examine and highlight the potential areas where workplace-related incidences could occur in the industry. Therefore, this paper presents an overview of the current status and future outlook on occupational health and safety (OHS) research in Sudan. The review of the literature indicates that although OHS research is still in its infancy in Sudan, various researchers have examined the nature, sources, and impacts of accidents, injuries, and illnesses that severely comprise workers’ health and safety. Furthermore, workers in Sudan are routinely exposed to toxic chemicals, medical wastes, noxious gases, noise pollution and other workplace-related risks that severely affect human health, safety and the environment. However, many employers, workers and government agencies have ample knowledge of OHS and its importance in the workplace. The studies also highlighted the crucial role played by OHS not only on health and safety but also the overall organisational performance and operational management in workplaces. Therefore, the design, development, and integration of OHS programmes into the workplace could greatly minimize and eliminate work-related accidents, illness, injuries or death.

Enterprise Resource Planning (ERP)

2009 ◽  
pp. 359-371
Author(s):  
Ronald E. McGaughey ◽  
Angappa Gunasekaran
Keyword(s):  
Enterprise Resource Planning ◽  
Resource Planning ◽  
Business Environment ◽  
Customer Relationship ◽  
Current Status ◽  
Future Research ◽  
Design Development ◽  
Erp Systems ◽  
Enterprise Integration ◽  
Business Needs

Business needs have driven the design, development, and use of Enterprise Resource Planning (ERP) systems. Intra-enterprise integration was a driving force in the design, development, and use of early ERP systems, but increased globalization, intense competition, and technological change have shifted to focus to inter-enterprise integration. Current and evolving ERP systems thus reflect the expanded scope of integration, with greater emphasis on things like supply chain management and customer relationship management. This manuscript explores the evolution of ERP, the current status of ERP, and the future of ERP, with the objective of promoting relevant future research in this important area. If researchers hope to play a significant role in the design, development, and use of suitable ERP systems to meet evolving business needs, then their research should focus, at least in part, on the changing business environment, its impact on business needs, and the requirements for enterprise systems that meet those needs.

Evolution of Enterprise Resource Planning

2010 ◽  
pp. 263-276
Author(s):  
Ronald E. McGaughey ◽  
Angappa Gunasekaran
Keyword(s):  
Enterprise Resource Planning ◽  
Driving Force ◽  
Resource Planning ◽  
Business Environment ◽  
Current Status ◽  
Future Research ◽  
Design Development ◽  
Erp Systems ◽  
Enterprise Integration ◽  
Business Needs

Business needs have driven the design, development, and use of the enterprise-wide information systems we call Enterprise Resource Planning (ERP) systems. Intra enterprise integration was a driving force in the design, development, and use of early ERP systems. Changing business needs have brought about the current business environment, wherein supply chain integration is desirable, if not essential, thus current and evolving ERP systems demonstrate an expanded scope of integration that encompasses limited inter-enterprise integration. This chapter explores the evolution, the current status, and future of ERP, with the objective of promoting relevant future research in this important area. If researchers hope to play a significant role in the design, development, and use of suitable ERP systems to meet evolving business needs, then their research should focus at least in part on the changing business environment, its impact on business needs, and the requirements for enterprise systems that meet those needs.

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