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1

DEVELOPMENT PLAN OF A SUSTAINABLE MICRO-HYDRO POWER PLANT AND DISTRIBUTION SYSTEM FOR A TRIBAL VILLAGE CLUSTER IN RURAL INDIA  

EPA Science Inventory

Columbia University Engineers Without Borders (CU-EWB) is developing a sustainable micro-hydro power plant for the Badi Trika Gouda village in the Indian state of Orissa. The community currently relies on firewood and animal waste matter for lighting and cooking. Our ...

2

Economic and Simple Power Line Modem Design for the Utility Applications in Micro-Hydro Power Systems of Nepal  

Microsoft Academic Search

This paper introduces a method for indigenous design and construction of a simple and economic low data rate power line modem. The target groups are small power systems of developing countries, like Nepal and its rural power infrastructure consisting of micro-hydro systems. Major focus is placed on how to design and construct a low cost power line modem with a

Rakesh C. Prajapati; Dipendra Rai; Bhupendra B. Chhetri

2006-01-01

3

Reassessment of irrigation potential for micro Hydro Power Generation  

Microsoft Academic Search

Hydro Power Generation projects are generally viewed as constructing large dams and reservoirs but available new research and engineering techniques have helped Hydro Power generation without large dams and without large reservoirs. In India, we have several water installations, irrigation dams, canals, streams or running rivers not tapped to generate power. In these cases the existing system and facilities can

S. P. Adhau; R. M. Moharil; P. G. Adhau

2010-01-01

4

Development of a Positive Displacement Micro-Hydro Turbine  

NASA Astrophysics Data System (ADS)

The objective of this study is to develop an efficient turbine that can be used to extract micro hydropower potential of a water supply system. For the case of high head and critical low flow rate range of micro hydropower resources, it requires very low specific speed turbines which are lower than conventional impulse turbines’ specific speed. For this purpose, we develop a new Positive Displacement Turbine (PDT). In order to reveal the performance characteristics of the new turbine, one conventional impulse turbine, which is used for automatic water faucet system, was tested for comparison. The test results show that the PDT was much more efficient than a conventional turbine and it can sustain high efficiency under the wide range of operating conditions. In addition, the efficiency of the PDT is much improved when reducing its side clearance. The pressure pulsations at the inlet and outlet of the PDT can be considerably minimized by using simple dampers.

Phommachanh, Dousith; Kurokawa, Junichi; Choi, Young-Do; Nakajima, Noboru

5

Installation and practical operation of the first micro hydro power system in Taiwan using irrigation water in an agriculture canal  

Microsoft Academic Search

This paper presents the design, installation, and field-measurement results of the first micro hydro power (MHP) generation system in Taiwan. This MHP prototype employs the irrigation water flowing in one of the irrigation canals of Yunlin irrigation association of Taiwan. Since the primary function of the irrigation canal is to distribute irrigation water to farmlands, the designed MHP must meet

Li Wang; Dong-Jing Lee; Jian-Hong Liu; Zan-Zia Chen; Zone-Yuan Kuo; Huei-Yuan Jang; Jiunn-Ji You; Jin-Tsang Tsai; Ming-Hua Tsai; Wey-Tau Lin; Yeun-Jong Lee

2008-01-01

6

Improvement of the efficiency of the Agnew micro hydro turbine at part loads due to installing guide vanes mechanism  

Microsoft Academic Search

Agnew turbine is an axial micro hydro of Kaplan type, with its main shaft subtending 45° to the line of horizon. Due to governmental power generating programs for limited hydro potentials in Iran and on the basis of a joint project between the University of Glasgow and the Iranian Research Organization for Science and Technology (IROST), the turbine was developed

Yousef Yassi; Safar hashemloo

2010-01-01

7

Cumulative Effects of Micro-Hydro Development on the Fisheries of the Swan River Drainage, Montana, First Annual Progress Report (Covering Field Season July-November 1982).  

SciTech Connect

This fisheries study is to determine the potential cumulative biological and economic effects of 20 small or micro-hydro-electric facilities (less than 5 megawatts) proposed to be constructed on tributaries to the Swan River, a 1738 square kilometer (671 square mile) drainage located in northwestern Montana. The study addresses portions of measure 1204 (b) (2) of the Norwthwest Power Planning Council's Columbia River Basin Fish and Wildlife Program. Aerial pre-surveys conducted during 1982 identified 102 stream reaches that may support fish populations in the Swan drainage between Swan and Lindbergh lakes. These reaches were located in 49 tributary streams and constituted 416 kilometers (258 miles) of potential fish habitat. Construction of all proposed small hydro projects would divert water from 54 kilometers (34 miles) or about 13 percent of the tributary system. Only two of the 20 proposed hydro sites did not support trout populations and most were populated by migratory bull trout and westslope cutthroat trout. Potential cumulative habitat losses that could result from dewatering of all proposed project areas were predicted using a stream reach classification scheme involving stream gradient, drainage ara, and fish population data. Preliminary results of this worst case analysis indicate that 23, 19 and 6 percent of the high quality rearing habitat for cutthroat, bull, and brook trout respectively would be lost.

Leathe, Stephen A.; Graham, Patrick J.

1984-03-01

8

Cumulative Effects of Micro-Hydro Development on the Fisheries of the Swan River Drainage, Montana, Volume II, Technical Information, 1983-1984 Final Report.  

SciTech Connect

This report summarizes a study to determine the potential cumulative effects of proposed small hydro development on the fisheries of the Swan River drainage. This report contains technical information and is a support document for the main report (Leathe and Enk, 1985). Consequently, discussion of results was minimized. The sections on fish population monitoring, streambed monitoring, habitat survey comparisons, and water temperature are the only portions that were not discussed in the main report. 5 refs., 55 figs., 44 tabs.

Leathe, Stephen A.

1985-07-01

9

Hydrogen as an energy carrier in stand-alone applications based on PV and PV–micro-hydro systems  

Microsoft Academic Search

The paper compares two different models of a hypothetical stand-alone energy system based only on renewable sources (solar irradiance and micro-hydro power) integrated with a system for the production of hydrogen (electrolyzer, compressed gas storage and proton exchange membrane fuel cell or PEMFC). The models of both systems have been designed to supply the electricity needs of a residential user

M. Santarelli; S. Macagno

2004-01-01

10

Cumulative Effects of Micro-Hydro Development on the Fisheries of the Swan River Drainage, Montana, Volume III, Fish and Habitat Inventory of Tributary Streams, 1983-1984 Final Report.  

SciTech Connect

This report summarizes a study of the fisheries of the Swan River drainage in relation to potential small hydro development. This information was collected in order to obtain a reliable basin-wide database which was used to evaluate the potential cumulative effects of a number of proposed small hydro developments on the fisheries of the drainage. For each named tributary stream there is a reach-by-reach narrative summary of general habitat characteristics, outstanding features of the stream, and fish populations and spawning use. An attempt was made to rank many of the measured parameters relative to other surveyed stream reaches in the drainage. 3 refs.

Leathe, Stephen A.

1985-03-01

11

Simulations of Blade Angle Effects on EGAT-Micro Hydro Turbine  

NASA Astrophysics Data System (ADS)

Following the feasibility study of design phase of EGAT (Electricity Generating Authority of Thailand) in-house micro hydro bulb turbine at Huai Kum Dam drainage pipeline from the reservoir for irrigation, the simulation of blade angle effects had been performed. In this case study, the turbine was designed at the average head of 21 m and water flow rate of 0.424 m3/s. The simulation was conducted in order to study of the effects of blade angle on the fluid flow for this specific case. The LES turbulence model under the practical condition of unsteady flow and incompressible fluid at Huai Kum Dam was investigated. The rotating blades effect the change in pressure and momentum which depend on head and flow rate of fluid. The research studied pressure and velocity of fluid flow on blades solving the pre-design for the improvement of hydro turbine efficiency. The computational Fluid Dynamics (CFD) was used to simulate the pressure and velocity distributions on blades of hydro bulb turbine which consists of five-blade runner and rotates at 980 rpm by using Fluent Software. The model was set at the blade twist angle of 25o and blade camber angle of 32o and then adjusted the guide vane angle to 60o, 65o and 70o respectively for comparing the maximum and minimum pressure on both sides of the blades as well as the corresponding efficiency. The results have shown that by setting guide vane angle to 60o, 65o and 70o, the maximum pressure, located at the leading edge of pressure side, are 213 kPa, 217 kPa and 207 kPa and the minimum pressure, located at the leading edge of suction side are -473 kPa, -465 kPa, and -581 kPa respectively. The flow profiles of pressure, velocity and stream line showed the guidelines of better blade angle comparisons. The maximum efficiency of hydro bulb turbine found in this study was 67.8% at blade angle of 32o and guide vane of 60o. This case study will be further investigated on the blade design for the improvement of the turbine efficiency before finalized the post-design.

Nuantong, Weerapon; Taechajedcadarungsri, Sirivit

2010-06-01

12

Developing powers  

NASA Astrophysics Data System (ADS)

Three new reports commissioned by the Pew Center on Global Climate Change examine the electric power sectors in Argentina, Brazil, and China, and the potential impact that energy use in each country has on climate change.In 1999, Argentina voluntarily agreed to lower its greenhouse gas emissions to 2 10% below projected emissions for 2012. The report looks at additional steps that could further reduce emissions, including adopting policies that favor renewable energy sources and nuclear power, and increasing energy efficiency by end-users.

Showstack, Randy

13

Heatpipe power system development  

SciTech Connect

This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The objective of the project was to develop a design approach that could enable the development of near-term, low-cost, space fission-power systems. Sixteen desired attributes were identified for such systems and detailed analyses were performed to verify that they are feasible. Preliminary design work was performed on one concept, the Heatpipe Power system (HPS). As a direct result of this project, funding was obtained from the National Aeronautics and Space Administration to build and test an HPS module. The module tests went well, and they now have funding to build a bimodal module.

Houts, M.G.; Poston, D.I.

1998-12-31

14

Power Systems Development Facility  

SciTech Connect

This report discusses Test Campaign TC12 of the Kellogg Brown & Root, Inc. (KBR) Transport Gasifier train with a Siemens Westinghouse Power Corporation (SW) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The Transport Gasifier is an advanced circulating fluidized-bed reactor designed to operate as either a combustor or a gasifier using a particulate control device (PCD). While operating as a gasifier, either air or oxygen can be used as the oxidant. Test run TC12 began on May 16, 2003, with the startup of the main air compressor and the lighting of the gasifier start-up burner. The Transport Gasifier operated until May 24, 2003, when a scheduled outage occurred to allow maintenance crews to install the fuel cell test unit and modify the gas clean-up system. On June 18, 2003, the test run resumed when operations relit the start-up burner, and testing continued until the scheduled end of the run on July 14, 2003. TC12 had a total of 733 hours using Powder River Basin (PRB) subbituminous coal. Over the course of the entire test run, gasifier temperatures varied between 1,675 and 1,850 F at pressures from 130 to 210 psig.

None

2003-07-01

15

POWER SYSTEMS DEVELOPMENT FACILITY  

SciTech Connect

This report discusses test campaign GCT4 of the Kellogg Brown & Root, Inc. (KBR) transport reactor train with a Siemens Westinghouse Power Corporation (Siemens Westinghouse) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The transport reactor is an advanced circulating fluidized-bed reactor designed to operate as either a combustor or a gasifier using one of two possible particulate control devices (PCDs). The transport reactor was operated as a pressurized gasifier during GCT4. GCT4 was planned as a 250-hour test run to continue characterization of the transport reactor using a blend of several Powder River Basin (PRB) coals and Bucyrus limestone from Ohio. The primary test objectives were: Operational Stability--Characterize reactor loop and PCD operations with short-term tests by varying coal-feed rate, air/coal ratio, riser velocity, solids-circulation rate, system pressure, and air distribution. Secondary objectives included the following: Reactor Operations--Study the devolatilization and tar cracking effects from transient conditions during transition from start-up burner to coal. Evaluate the effect of process operations on heat release, heat transfer, and accelerated fuel particle heat-up rates. Study the effect of changes in reactor conditions on transient temperature profiles, pressure balance, and product gas composition. Effects of Reactor Conditions on Synthesis Gas Composition--Evaluate the effect of air distribution, steam/coal ratio, solids-circulation rate, and reactor temperature on CO/CO{sub 2} ratio, synthesis gas Lower Heating Value (LHV), carbon conversion, and cold and hot gas efficiencies. Research Triangle Institute (RTI) Direct Sulfur Recovery Process (DSRP) Testing--Provide syngas in support of the DSRP commissioning. Loop Seal Operations--Optimize loop seal operations and investigate increases to previously achieved maximum solids-circulation rate.

Unknown

2002-11-01

16

Developments in tidal power  

NASA Astrophysics Data System (ADS)

Successful, planned, and potential tidal power plants and sites are discussed. Units are in operation in France and Russia, with the French plant using reversible blade turbines being used as a design guide for plants in Argentina and Australia. The U.S. is studying the feasibility of a plant in Passamaquaddy Bay, and Canada is pursuing construction of a plant in the Bay of Fundy. The Severn River in Great Britain is receiving a site study, and over a hundred plants have been built as local power systems in China. Bulb-type turbines, which enhance the volume emptying and filling the retaining basin, are considered as the highest performing power unit. Simpler one-way flow turbines have been suggested as more economical to install. Governmental, institutional, and investor impediments to tidal power plant are explored.

Charlier, R. H.

17

POWER SYSTEMS DEVELOPMENT FACILITY  

SciTech Connect

This report discusses test campaign GCT3 of the Halliburton KBR transport reactor train with a Siemens Westinghouse Power Corporation (Siemens Westinghouse) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The transport reactor is an advanced circulating fluidized-bed reactor designed to operate as either a combustor or a gasifier using one of two possible particulate control devices (PCDs). The transport reactor was operated as a pressurized gasifier during GCT3. GCT3 was planned as a 250-hour test run to commission the loop seal and continue the characterization of the limits of operational parameter variations using a blend of several Powder River Basin coals and Bucyrus limestone from Ohio. The primary test objectives were: (1) Loop Seal Commissioning--Evaluate the operational stability of the loop seal with sand and limestone as a bed material at different solids circulation rates and establish a maximum solids circulation rate through the loop seal with the inert bed. (2) Loop Seal Operations--Evaluate the loop seal operational stability during coal feed operations and establish maximum solids circulation rate. Secondary objectives included the continuation of reactor characterization, including: (1) Operational Stability--Characterize the reactor loop and PCD operations with short-term tests by varying coal feed, air/coal ratio, riser velocity, solids circulation rate, system pressure, and air distribution. (2) Reactor Operations--Study the devolatilization and tar cracking effects from transient conditions during transition from start-up burner to coal. Evaluate the effect of process operations on heat release, heat transfer, and accelerated fuel particle heat-up rates. Study the effect of changes in reactor conditions on transient temperature profiles, pressure balance, and product gas composition. (3) Effects of Reactor Conditions on Syngas Composition--Evaluate the effect of air distribution, steam/coal ratio, solids circulation rate, and reactor temperature on CO/CO{sub 2} ratio, H{sub 2}/converted carbon ratio, gasification rates, carbon conversion, and cold and hot gas efficiencies. Test run GCT3 was started on December 1, 2000, with the startup of the thermal oxidizer fan, and was completed on February 1, 2001. This test was conducted in two parts; the loop seal was commissioned during the first part of this test run from December 1 through 15, which consisted of hot inert solids circulation testing. These initial tests provided preliminary data necessary to understand different parameters associated with the operation and performance of the loop seal. The loop seal was tested with coal feed during the second part of the test run and additional data was gathered to analyze reactor operations and to identify necessary modifications to improve equipment and process performance. In the second part of GCT3, the gasification portion of the test, from January 20 to February 1, 2001, the mixing zone and riser temperatures were varied between 1,675 and 1,825 F at pressures ranging from 200 to 240 psig. There were 306 hours of solid circulation and 184 hours of coal feed attained in GCT3.

Unknown

2002-05-01

18

"Word Power" (Vocabulary Development).  

ERIC Educational Resources Information Center

Containing numerous vocabulary-building activities and exercises, this guidebook is designed to help elementary students learn to manipulate language as they gain concrete experiences with words, increase their "word power," and have fun. The activities described involve dictionary games, synonyms, "saidonyms" (alternatives for the overused word…

Voorhees, Roxy

19

Opportunities in water power development  

Microsoft Academic Search

Water power is a clean and renewable, conventional energy resource. Furthermore, most of the water power schemes are often multi-purpose projects serving, beside hydroelectric energy production, to purposes like flood control, irrigation, navigation, etc.; so that they are considered as basic components of the socioeconomic development from various perspectives. It should be put, therefore, special emphasis on the maximal exploitation

U. Ozis; E. Benzeden; N. Harmancioglu; F. Turkman

1980-01-01

20

Opportunities in water power development  

SciTech Connect

Water power is a clean and renewable, conventional energy resource. Furthermore, most of the water power schemes are often multi-purpose projects serving, beside hydroelectric energy production, to purposes like flood control, irrigation, navigation, etc.; so that they are considered as basic components of the socioeconomic development from various perspectives. It should be put, therefore, special emphasis on the maximal exploitation of water power resources throughout the world. The water power potential can be assessed at gross, technically exploitable, and economically feasible levels; estimates for the world varies from 44 to 700 thousand TWh/a for the gross, from 6 to 25 thousand TWh/a for the economically feasible water power potential; whereas the latter figures might increase considerably after detailed studies according to changing economic conditions. Water power schemes are actually generating about 2 thousand TWh/a, being slightly more than one fifth of the world's total electricity generation and having a modest share of 5% in the total energy balance. With regard to the scarcity of the conventional fossile fuels, an increase of the share of water power in electricity generation should be anticipated, especially in developing countries where the large part of the water power potential is still undeveloped. An investigation of the past trends showed that the period required for the development of 95% of a country's hydroelectric potential will be about 60-70 years. Thus, the last decades of this century and the early decades of the next century may witness a boom of water power development throughout the world.

Ozis, U.; Benzeden, E.; Harmancioglu, N.; Turkman, F.

1980-12-01

21

Hydroelectric Power in Developing Countries  

Microsoft Academic Search

Over the last two decades, global electricity production has more than doubled and electricity demand is rising rapidly around the world as economic development spreads to emerging economies. Not only has electricity demand increased significantly, it is the fastest growing end-use of energy. Therefore, technical, economic, and environmental benefits of hydroelectric power make it an important contributor to the future

I. Yüksel

2009-01-01

22

Nanosat Intelligent Power System Development  

NASA Technical Reports Server (NTRS)

NASA Goddard Space Flight Center is developing a class of satellites called nano-satellites. The technologies developed for these satellites will enable a class of constellation missions for the NASA Space Science Sun-Earth Connections theme and will be of great benefit to other NASA enterprises. A major challenge for these missions is meeting significant scientific- objectives with limited onboard and ground-based resources. Total spacecraft power is limited by the small satellite size. Additionally, it is highly desirable to minimize operational costs by limiting the ground support required to manage the constellation. This paper will describe how these challenges are met in the design of the nanosat power system. We will address the factors considered and tradeoffs made in deriving the nanosat power system architecture. We will discuss how incorporating onboard fault detection and correction capability yields a robust spacecraft power bus without the mass and volume penalties incurred from redundant systems and describe how power system efficiency is maximized throughout the mission duration.

Johnson, Michael A.; Beaman, Robert G.; Mica, Joseph A.; Truszkowski, Walter F.; Rilee, Michael L.; Simm, David E.

1999-01-01

23

Wind, Sun and Water: Complexities of Alternative Energy Development in Rural Northern Peru  

ERIC Educational Resources Information Center

Drawing on recent research with NGO-driven projects in rural Cajamarca, Peru, we examine the paradoxes of relying on wind, solar and micro-hydro generation of electricity for rural community development. In spite of cost, vagaries of these energy resources and limited material benefits, especially with wind and solar systems, villagers are eagerly…

Love, Thomas; Garwood, Anna

2011-01-01

24

Development of Thailand's first nuclear power plant  

Microsoft Academic Search

Strengthening energy security, mitigating global warming and being competitive in global markets are among reasons Thailand is developing nuclear power program. Based on the current Thailand Power Development Plan there will be 5 units of a 1,000 MWe nuclear power plant commercialized from 2020 to 2028. Nuclear power will contribute no greater than 10% of Thailand electricity generation. Currently, Electricity

A. Patchimpattapong

2010-01-01

25

Wind power development -Status and perspectives  

E-print Network

Wind power development - Status and perspectives Poul Erik Morthorst Risoe National Laboratory for the development of wind power, contributing to the Macro Task E1 on pro- duction cost for fusion and alternative on the development of the production costs for wind power, limited to turbines connected to the public grid

26

SOLAR POWER SATELLITES: RECENT DEVELOPMENTS  

Microsoft Academic Search

Solar power is a reality. Today, increasing numbers of photovoltaic and other solar-powered installations are in service around the world and in space. The Solar Power Satellite has been hailed by proponents as the answer to future global energy security and dismissed by detractors as impractical and uneconomic. This paper reviews recent design and feasibility studies, advances made in enabling

Frank E. Little

27

Role of nuclear power in the Philippine power development program  

SciTech Connect

The reintroduction of nuclear power in the Philippines is favored by several factors such as: the inclusion of nuclear energy in the energy sector of the science and technology agenda for national development (STAND); the Large gap between electricity demand and available local supply for the medium-term power development plan; the relatively lower health risks in nuclear power fuel cycle systems compared to the already acceptable power systems; the lower environmental impacts of nuclear power systems compared to fossil fuelled systems and the availability of a regulatory framework and trained personnel who could form a core for implementing a nuclear power program. The electricity supply gap of 9600 MW for the period 1993-2005 could be partly supplied by nuclear power. The findings of a recent study are described, as well as the issues that have to be addressed in the reintroduction of nuclear power.

Aleta, C.R. [Philippine Nuclear Research Institite, Quezon City (Philippines)

1994-12-31

28

Renewables for sustainable village power  

SciTech Connect

It is estimated that two billion people live without electricity and its services. In addition, there is a sizeable number of rural villages that have limited electrical service, with either part-day operation by diesel gen-sets or partial electrification (local school or community center and several nearby houses). For many villages connected to the grid, power is often sporadically available and of poor quality. The U.S. National Renewable Energy Laboratory (NREL) in Golden, Colorado, has initiated a program to address these potential electricity opportunities in rural villages through the application of renewable energy (RE) technologies. The objective of this program is to develop and implement applications that demonstrate the technical performance, economic competitiveness, operational viability, and environmental benefits of renewable rural electric solutions, compared to the conventional options of line extension and isolated diesel mini-grids. These four attributes foster sustainability; therefore, the program is entitled Renewables for Sustainable Village Power (RSVP). The RSVP program is a multi-technology, multi-application program composed of six activities, including village applications development, computer model development, systems analysis, pilot project development, technical assistance, and Internet-based village power project data base. While the current program emphasizes wind, photovoltaics (PV), and their hybrids with diesel gen-sets, micro-hydro and micro-biomass technologies may be integrated in the future. NREL`s RSVP team is currently involved in rural electricity projects in thirteen countries, with U.S., foreign, and internationally based agencies and institutions. The integration of the technology developments, institutional experiences, and the financial solutions for the implementation of renewables in the main line rural electrification processes in both the developing world and remote regions of the developed world is the goal.

Flowers, L.

1997-03-01

29

Development of gallium nitride power transistors  

E-print Network

GaN-based high-voltage transistors have outstanding properties for the development of ultra-high efficiency and compact power electronics. This thesis describes a new process technology for the fabrication of GaN power ...

Piedra, Daniel, M. Eng. Massachusetts Institute of Technology

2011-01-01

30

Space power development impact on technology requirements  

NASA Technical Reports Server (NTRS)

The paper is concerned with the selection of a specific spacecraft power technology and the identification of technology development to meet system requirements. Requirements which influence the selection of a given technology include the power level required, whether the load is constant or transient in nature, and in the case of transient loads, the time required to recover the power, and overall system safety. Various power technologies, such as solar voltaic power, solar dynamic power, nuclear power systems, and electrochemical energy storage, are briefly described.

Cassidy, J. F.; Fitzgerald, T. J.; Gilje, R. I.; Gordon, J. D.

1986-01-01

31

Fission Surface Power Technology Development Status  

NASA Technical Reports Server (NTRS)

Power is a critical consideration in planning exploration of the surfaces of the Moon, Mars, and beyond. Nuclear power is an important option, especially for locations in the solar system where sunlight is limited in availability or intensity. NASA is maintaining the option for fission surface power for the Moon and Mars by developing and demonstrating technology for an affordable fission surface power system. Because affordability drove the determination of the system concept that this technology will make possible, low development and recurring costs result, while required safety standards are maintained. However, an affordable approach to fission surface power also provides the benefits of simplicity, robustness, and conservatism in design. This paper will illuminate the multiplicity of benefits to an affordable approach to fission surface power, and will describe how the foundation for these benefits is being developed and demonstrated in the Exploration Technology Development Program s Fission Surface Power Project.

Palac, Donald T.; Mason, Lee S.; Houts, Michael G.; Harlow, Scott

2010-01-01

32

THE POWER OF `PETASCALE' COMPUTING The development of powerful supercomputers  

E-print Network

of petascale computing offers a golden opportunity for climate simulation and prediction scientists to advanceTHE POWER OF `PETASCALE' COMPUTING The development of powerful supercomputers capable of analyzing Science Foundation to generate new "petascale" computer models depicting detailed climate dynamics

Miami, University of

33

The development of swimming power  

PubMed Central

Summary Purpose: the aim of this study was to investigate the effects of the transfer strength training method on swimming power. Methods: twenty male swimmers “master“ were randomly allocated to strength (n= 10, ST) and swimming training (n=10, SW) groups. Both groups performed six-weeks training based on swimming training for SW and strength training which consisted in a weight training session immediately followed by the maximum swimming velocity. The performance in both groups was assessed by Maximal-Mechanical-External-Power (MMEP) before and after the six-weeks period, using a custom ergometer that provided force, velocity, and power measurement in water. Results: a significant increased MMEP in ST group (5.73% with p< 0.05) was obtained by an increased strength (11.70% with p< 0.05) and a decreased velocity (4.99% with p> 0.05). Conversely, in the SW group there was a decreased in MMEP (7.31%; p< 0.05), force and velocity (4.16%, and 3.45; respectively p> 0.05). Conclusion: this study showed that the transfer training method, based on combination of weight training (in dry condition) immediately followed by fast swim (in water) significantly improves swimming-power in master. PMID:25767781

Gatta, Giorgio; Leban, Bruno; Paderi, Maurizio; Padulo, Johnny; Migliaccio, Gian Mario; Pau, Massimiliano

2014-01-01

34

Fission Surface Power Technology Development Status  

NASA Technical Reports Server (NTRS)

With the potential future deployment of a lunar outpost there is expected to be a clear need for a high-power, lunar surface power source to support lunar surface operations independent of the day-night cycle, and Fission Surface Power (FSP) is a very effective solution for power levels above a couple 10 s of kWe. FSP is similarly enabling for the poorly illuminated surface of Mars. The power levels/requirements for a lunar outpost option are currently being studied, but it is known that cost is clearly a predominant concern to decision makers. This paper describes the plans of NASA and the DOE to execute an affordable fission surface power system technology development project to demonstrate sufficient technology readiness of an affordable FSP system so viable and cost-effective FSP system options will be available when high power lunar surface system choices are expected to be made in the early 2010s.

Palac, Donald T.; Mason, Lee S.; Harlow, Scott

2009-01-01

35

Fission Surface Power Technology Development Update  

NASA Technical Reports Server (NTRS)

Power is a critical consideration in planning exploration of the surfaces of the Moon, Mars, and places beyond. Nuclear power is an important option, especially for locations in the solar system where sunlight is limited or environmental conditions are challenging (e.g., extreme cold, dust storms). NASA and the Department of Energy are maintaining the option for fission surface power for the Moon and Mars by developing and demonstrating technology for a fission surface power system. The Fission Surface Power Systems project has focused on subscale component and subsystem demonstrations to address the feasibility of a low-risk, low-cost approach to space nuclear power for surface missions. Laboratory demonstrations of the liquid metal pump, reactor control drum drive, power conversion, heat rejection, and power management and distribution technologies have validated that the fundamental characteristics and performance of these components and subsystems are consistent with a Fission Surface Power preliminary reference concept. In addition, subscale versions of a non-nuclear reactor simulator, using electric resistance heating in place of the reactor fuel, have been built and operated with liquid metal sodium-potassium and helium/xenon gas heat transfer loops, demonstrating the viability of establishing system-level performance and characteristics of fission surface power technologies without requiring a nuclear reactor. While some component and subsystem testing will continue through 2011 and beyond, the results to date provide sufficient confidence to proceed with system level technology readiness demonstration. To demonstrate the system level readiness of fission surface power in an operationally relevant environment (the primary goal of the Fission Surface Power Systems project), a full scale, 1/4 power Technology Demonstration Unit (TDU) is under development. The TDU will consist of a non-nuclear reactor simulator, a sodium-potassium heat transfer loop, a power conversion unit with electrical controls, and a heat rejection system with a multi-panel radiator assembly. Testing is planned at the Glenn Research Center Vacuum Facility 6 starting in 2012, with vacuum and liquid-nitrogen cold walls to provide simulation of operationally relevant environments. A nominal two-year test campaign is planned including a Phase 1 reactor simulator and power conversion test followed by a Phase 2 integrated system test with radiator panel heat rejection. The testing is expected to demonstrate the readiness and availability of fission surface power as a viable power system option for NASA's exploration needs. In addition to surface power, technology development work within this project is also directly applicable to in-space fission power and propulsion systems.

Palac, Donald T.; Mason, Lee S.; Houts, Michael G.; Harlow, Scott

2011-01-01

36

Sustainable development of hydroelectric power  

Microsoft Academic Search

This paper deals with policies to meet increasing demand for electricity in Turkey and elsewhere. Environmental problems created by exploitation of domestic resources should not be ignored. We comment on adverse effects of large-scale hydroelectric projects in India and Canada. We argue in favor of small-scale dams for sustainble development.

Amin U. Sarkar; Serkan Karagöz

1995-01-01

37

High power millimeter wave source development program  

NASA Technical Reports Server (NTRS)

High power millimeter wave sources for fusion program; ECH source development program strategy; and 1 MW, 140 GHz gyrotron experiment design philosophy are briefly outlined. This presentation is represented by viewgraphs only.

George, T. V.

1989-01-01

38

Power Management and Distribution System Developed for Thermionic Power Converters  

NASA Technical Reports Server (NTRS)

A spacecraft solar, bimodal system combines propulsion and power generation into a single integrated system. An Integrated Solar Upper Stage (ISUS) provides orbital transfer capabilities, power generation for payloads, and onboard propulsion to the spacecraft. A key benefit of a bimodal system is a greater payload-to-spacecraft mass ratio resulting in lower launch vehicle requirements. Scaling down to smaller launch vehicles increases space access by reducing overall mission cost. NASA has joined efforts with the Air Force Phillips Laboratory to develop enabling technologies for such a system. The NASA/Air Force bimodal concept uses solar concentrators to focus energy into an integrated power plant. This power plant consists of a graphite core that stores thermal energy within a cavity. An array of thermionic converters encircles the graphite cavity and provides electrical energy conversion functions. During the power generation phase of the bimodal system, the thermionic converters are exposed to the heated cavity and convert the thermal energy to electricity. Near-term efforts of the ISUS bimodal program are focused on a ground demonstration of key technologies in order to proceed to a full space flight test. Thermionic power generation is one key technology of the bimodal concept. Thermionic power converters impose unique operating requirements upon a power management and distribution (PMAD) system design. Single thermionic converters supply large currents at very low voltages. Operating voltages can vary over a range of up to 3 to 1 as a function of operating temperature. Most spacecraft loads require regulated 28-volts direct-current (Vdc) power. A combination of series-connected converters and powerprocessing boosters is required to deliver power to the spacecraft's payloads at this level.

Baez, Anastacio N.

1998-01-01

39

NASA developments in solid state power amplifiers  

NASA Technical Reports Server (NTRS)

Over the last ten years, NASA has undertaken an extensive program aimed at development of solid state power amplifiers for space applications. Historically, the program may be divided into three phases. The first efforts were carried out in support of the advanced communications technology satellite (ACTS) program, which is developing an experimental version of a Ka-band commercial communications system. These first amplifiers attempted to use hybrid technology. The second phase was still targeted at ACTS frequencies, but concentrated on monolithic implementations, while the current, third phase, is a monolithic effort that focusses on frequencies appropriate for other NASA programs and stresses amplifier efficiency. The topics covered include: (1) 20 GHz hybrid amplifiers; (2) 20 GHz monolithic MESFET power amplifiers; (3) Texas Instruments' (TI) 20 GHz variable power amplifier; (4) TI 20 GHz high power amplifier; (5) high efficiency monolithic power amplifiers; (6) GHz high efficiency variable power amplifier; (7) TI 32 GHz monolithic power amplifier performance; (8) design goals for Hughes' 32 GHz variable power amplifier; and (9) performance goals for Hughes' pseudomorphic 60 GHz power amplifier.

Leonard, Regis F.

1990-01-01

40

Developments in soft magnetic power ferrites  

Microsoft Academic Search

Reduction in size and weight of power supplies can be achieved by using switched mode or resonant concepts at increasing frequencies, which may even exceed 1 MHz nowadays. For magnetic components this requires new ferrite grades with increasingly severe demands on low magnetic and eddy current losses. A well-balanced series of MnZn and NiZn power ferrites has been developed for

D. Stoppels

1996-01-01

41

The Clean Development Mechanism and Power Sector Reforms in Developing  

E-print Network

in the Medium Term 19 ­ 21 May, 2003 #12;Structure of the presentation: I. Introduction II. The Kyoto Protocol facilitate the development and implementation for the Clean Development Mechanism of the Kyoto Protocol the power sector reform experiences in Chile, the Philippines and Kenya? #12;II. The Kyoto Protocol

42

Solar Power and Sustainability in Developing Countries  

Microsoft Academic Search

Renewable energy is not an entirely new concept, but it continues to rapidly emerge as an alternative to fossil fuels and, hopefully, other deleterious energy sources. Products within this industry are being created on an unprecedented scale, and various systems are available for use. However, none are as applicable to the sustainability of developing countries as is solar power. Solar

Saeed D. Foroudastan; Olivia Dees

43

Millimeterwave Space Power Grid architecture development 2012  

NASA Astrophysics Data System (ADS)

This is an update of the Space Power Grid architecture for space-based solar power with an improved design of the collector/converter link, the primary heater and the radiator of the active thermal control system. The Space Power Grid offers an evolutionary approach towards TeraWatt-level Space-based solar power. The use of millimeter wave frequencies (around 220GHz) and Low-Mid Earth Orbits shrinks the size of the space and ground infrastructure to manageable levels. In prior work we showed that using Brayton cycle conversion of solar power allows large economies of scale compared to the linear mass-power relationship of photovoltaic conversion. With high-temperature materials permitting 3600 K temperature in the primary heater, over 80 percent cycle efficiency was shown with a closed helium cycle for the 1GW converter satellite which formed the core element of the architecture. Work done since the last IEEE conference has shown that the use of waveguides incorporated into lighter-than-air antenna platforms, can overcome the difficulties in transmitting millimeter wave power through the moist, dense lower atmosphere. A graphene-based radiator design conservatively meets the mass budget for the waste heat rejection system needed for the compressor inlet temperature. Placing the ultralight Mirasol collectors in lower orbits overcomes the solar beam spot size problem of high-orbit collection. The architecture begins by establishing a power exchange with terrestrial renewable energy plants, creating an early revenue generation approach with low investment. The approach allows for technology development and demonstration of high power millimeter wave technology. A multinational experiment using the International Space Station and another power exchange satellite is proposed to gather required data and experience, thus reducing the technical and policy risks. The full-scale architecture deploys pairs of Mirasol sunlight collectors and Girasol 1 GW converter satellites t- ramp up space solar power level to over 5.6 TeraWatts by year 50 from project start. Runway-based launch and landing are required to achieve the launch productivity as well as the cost reductions to enable such a large deployment on schedule. Advancements in the certainty of millimeter wave conversion technology and runway-based space access, are seen to be the outstanding issues in proceeding to full-scale Space Solar Power.

Komerath, Narayanan; Dessanti, Brendan; Shah, Shaan

44

Advanced Power Regulator Developed for Spacecraft  

NASA Technical Reports Server (NTRS)

The majority of new satellites generate electrical power using photovoltaic solar arrays and store energy in batteries for use during eclipse periods. Careful regulation of battery charging during insolation can greatly increase the expected lifetime of the satellite. The battery charge regulator is usually custom designed for each satellite and its specific mission. Economic competition in the small satellite market requires battery charge regulators that are lightweight, efficient, inexpensive, and modular enough to be used in a wide variety of satellites. A new battery charge regulator topology has been developed at the NASA Lewis Research Center to address these needs. The new regulator topology uses industry-standard dc-dc converters and a unique interconnection to provide size, weight, efficiency, fault tolerance, and modularity benefits over existing systems. A transformer-isolated buck converter is connected such that the high input line is connected in series with the output. This "bypass connection" biases the converter's output onto the solar array voltage. Because of this biasing, the converter only processes the fraction of power necessary to charge the battery above the solar array voltage. Likewise, the same converter hookup can be used to regulate the battery output to the spacecraft power bus with similar fractional power processing.

1996-01-01

45

Development of Solar Powered Irrigation System  

NASA Astrophysics Data System (ADS)

Development of a solar powered irrigation system has been discussed in this paper. This system would be SCADA-based and quite useful in areas where there is plenty of sunshine but insufficient water to carry out farming activities, such as rubber plantation, strawberry plantation, or any plantation, that requires frequent watering. The system is powered by solar system as a renewable energy which uses solar panel module to convert Sunlight into electricity. The development and implementation of an automated SCADA controlled system that uses PLC as a controller is significant to agricultural, oil and gas monitoring and control purpose purposes. In addition, the system is powered by an intelligent solar system in which solar panel targets the radiation from the Sun. Other than that, the solar system has reduced energy cost as well as pollution. The system is equipped with four input sensors; two soil moisture sensors, two level detection sensors. Soil moisture sensor measures the humidity of the soil, whereas the level detection sensors detect the level of water in the tank. The output sides consist of two solenoid valves, which are controlled respectively by two moistures sensors.

Abdelkerim, A. I.; Sami Eusuf, M. M. R.; Salami, M. J. E.; Aibinu, A.; Eusuf, M. A.

2013-12-01

46

High frequency, high power capacitor development  

NASA Astrophysics Data System (ADS)

A program to develop a special high energy density, high power transfer capacitor to operate at frequency of 40 kHz, 600 V rms at 125 A rms plus 600 V dc bias for space operation. The program included material evaluation and selection, a capacitor design was prepared, a thermal analysis performed on the design. Fifty capacitors were manufactured for testing at 10 kHz and 40 kHz for 50 hours at Industrial Electric Heating Co. of Columbus, Ohio. The vacuum endurance test used on environmental chamber and temperature plate furnished by Maxwell. The capacitors were energized with a special power conditioning apparatus developed by Industrial Electric Heating Co. Temperature conditions of the capacitors were monitored by IEHCo test equipment. Successful completion of the vacuum endurance test series confirmed achievement of the main goal of producing a capacitor or reliable operation at high frequency in an environment normally not hospitable to electrical and electronic components. The capacitor developed compared to a typical commercial capacitor at the 40 kHz level represents a decrease in size and weight by a factor of seven.

White, C. W.; Hoffman, P. S.

1983-03-01

47

High frequency, high power capacitor development  

NASA Technical Reports Server (NTRS)

A program to develop a special high energy density, high power transfer capacitor to operate at frequency of 40 kHz, 600 V rms at 125 A rms plus 600 V dc bias for space operation. The program included material evaluation and selection, a capacitor design was prepared, a thermal analysis performed on the design. Fifty capacitors were manufactured for testing at 10 kHz and 40 kHz for 50 hours at Industrial Electric Heating Co. of Columbus, Ohio. The vacuum endurance test used on environmental chamber and temperature plate furnished by Maxwell. The capacitors were energized with a special power conditioning apparatus developed by Industrial Electric Heating Co. Temperature conditions of the capacitors were monitored by IEHCo test equipment. Successful completion of the vacuum endurance test series confirmed achievement of the main goal of producing a capacitor or reliable operation at high frequency in an environment normally not hospitable to electrical and electronic components. The capacitor developed compared to a typical commercial capacitor at the 40 kHz level represents a decrease in size and weight by a factor of seven.

White, C. W.; Hoffman, P. S.

1983-01-01

48

An accelerated fusion power development plan  

NASA Astrophysics Data System (ADS)

Energy for electricity and transportation is a national issue with worldwide environmental and political implications. The world must have energy options for the next century that are not vulnerable to possible disruption for technical, environmental, public confidence, or other reasons. Growing concerns about the greenhouse effect and the safety of transporting oil may lead to reduced burning of coal and other fossil fuels, and the incidents at Three Mile Island and Chernobyl, as well as nuclear waste storage problems, have eroded public acceptance of nuclear fission. Meeting future world energy needs will require improvements in energy efficiency and conservation. However, the world will soon need new central station power plants and increasing amounts of fuel for the transportation sector. The use of fossil fuels, and possibly even fission power, will very likely be restricted because of environmental, safety, and, eventually, supply considerations. Time is running out for policymakers. New energy technologies cannot be brought to the marketplace overnight. Decades are required to bring a new energy production technology from conception to full market penetration. With the added urgency to mitigate deleterious environmental effects of energy use, policymakers must act decisively now to establish and support vigorous energy technology development programs. The U.S. has invested 8 billion over the past 40 years in fusion research and development. If the U.S. fusion program proceeds according to its present strategy, an additional 40 years, and more money, will be expended before fusion will provide commercial electricity. Such an extended schedule is neither cost-effective nor technically necessary. It is time to launch a national venture to construct and operate a fusion power pilot plant. Such a plant could be operational within 15 years of a national commitment to proceed.

Dean, Stephen O.; Baker, Charles C.; Cohn, Daniel R.; Kinkead, Susan D.

1991-06-01

49

Ultrafast Power Processor for Smart Grid Power Module Development  

SciTech Connect

This project’s goal was to increase the switching speed and decrease the losses of the power semiconductor devices and power switch modules necessary to enable Smart Grid energy flow and control equipment such as the Ultra-Fast Power Processor. The primary focus of this project involves exploiting the new silicon-based Super-GTO (SGTO) technology and build on prototype modules already being developed. The prototype super gate-turn-off thyristor (SGTO) has been tested fully under continuously conducting and double-pulse hard-switching conditions for conduction and switching characteristics evaluation. The conduction voltage drop measurement results indicate that SGTO has excellent conduction characteristics despite inconsistency among some prototype devices. Tests were conducted with two conditions: (1) fixed gate voltage and varying anode current condition, and (2) fixed anode current and varying gate voltage condition. The conduction voltage drop is relatively a constant under different gate voltage condition. In terms of voltage drop as a function of the load current, there is a fixed voltage drop about 0.5V under zero current condition, and then the voltage drop is linearly increased with the current. For a 5-kV voltage blocking device that may operate under 2.5-kV condition, the projected voltage drop is less than 2.5 V under 50-A condition, or 0.1%. If the device is adopted in a converter operating under soft-switching condition, then the converter can achieve an ultrahigh efficiency, typically above 99%. The two-pulse switching test results indicate that SGTO switching speed is very fast. The switching loss is relatively low as compared to that of the insulated-gate-bipolar-transistors (IGBTs). A special phenomenon needs to be noted is such a fast switching speed for the high-voltage switching tends to create an unexpected C?dv/dt current, which reduces the turn-on loss because the dv/dt is negative and increases the turn-off loss because the dv/dt is positive. As a result, the turn-on loss at low current is quite low, and the turn-off loss at low current is relatively high. The phenomenon was verified with junction capacitance measurement along with the dv/dt calculation. Under 2-kV test condition, the turn-on and turn-off losses at 25-A is about 3 and 9 mJ, respectively. As compared to a 4.5-kV, 60-A rated IGBT, which has turn-on and turn-off losses about 25 and 20 mJ under similar test condition, the SGTO shows significant switching loss reduction. The switching loss depends on the switching frequency, but under hard-switching condition, the SGTO is favored to the IGBT device. The only concern is during low current turn-on condition, there is a voltage bump that can translate to significant power loss and associated heat. The reason for such a current bump is not known from this study. It is necessary that the device manufacturer perform though test and provide the answer so the user can properly apply SGTO in pulse-width-modulated (PWM) converter and inverter applications.

MAITRA, ARINDAM [EPRI] [EPRI; LITWIN, RAY [EPRI] [EPRI; lai, Jason [Enertronics] [Enertronics; Syracuse, David [Silicon Power] [Silicon Power

2012-12-30

50

Power Planning and Fish and Wildlife Program Development  

E-print Network

Power Planning and Fish and Wildlife Program Development RELATIONSHIP OF THE POWER PLAN TO THE FISH AND WILDLIFE The Power Act requires that the Council's power plan and Bonneville's resource acquisition program and to accommodate system operations to benefit fish and wildlife. The central purpose of this chapter of the power

51

FEED-IN TARIFFS AND OFFSHORE WIND POWER DEVELOPMENT  

E-print Network

FEED-IN TARIFFS AND OFFSHORE WIND POWER DEVELOPMENT Prepared by Jon Lilley, Blaise Sheridan, Dawn........................................................................................................................ 28 #12; 3 Feed-in Tariffs and Offshore Wind Power Development Prepared Pursuant to DOE Grant Em-Powering Center for Carbon-free Power Integration (CCPI) Final Report November 2010 Prepared under a grant (DE

Firestone, Jeremy

52

High-Power Magnetoplasmadynamic Thruster Being Developed  

NASA Technical Reports Server (NTRS)

High-power electromagnetic thrusters have been proposed as primary in-space propulsion options for several of the bold new interplanetary and deep space missions envisioned by the Human Exploration and Development of Space (HEDS) Strategic Enterprise. As the lead center for electric propulsion, the NASA Glenn Research Center is actively involved in the design, development, and testing of high-power electromagnetic technologies to meet these demanding mission requirements. One concept of particular interest is the magnetoplasmadynamic (MPD) thruster, shown schematically in the preceding figure. In its basic form, the MPD thruster consists of a central cathode surrounded by a concentric cylindrical anode. A high-current arc is struck between the anode and cathode, which ionizes and accelerates a gas (plasma) propellant. In the self-field version of the thruster, an azimuthal magnetic field generated by the current returning through the cathode interacts with the radial discharge current flowing through the plasma to produce an axial electromagnetic body force, providing thrust. In applied field-versions of the thruster, a magnetic field coil surrounding the anode is used to provide additional radial and axial magnetic fields that can help stabilize and accelerate the plasma propellant. The following figure shows an experimental megawatt-class MPD thruster developed at Glenn. The MPD thruster is fitted inside a magnetic field coil, which in turn is mounted on a thrust stand supported by thin metal flexures. A calibrated position transducer is used to determine the force provided by the thruster as a function of thrust stand displacement. Power to the thruster is supplied by a 250-kJ capacitor bank, which provides up to 30- MW to the thruster for a period of 2 msec. This short period of time is sufficient to establish thruster performance similar to steady-state operation, and it allows a number of thruster designs to be quickly and economically evaluated. In concert with this experimental research, Glenn is also developing and using advanced numerical simulations to predict the performance of self-field and applied-field MPD thrusters.

LaPointe, Michael R.

2001-01-01

53

Gyrotron development for space power beaming  

NASA Technical Reports Server (NTRS)

The use of a gyrotron for space power beaming, especially in the form of a lunar orbiting power station is discussed. The advantages of phased array power beaming, output power, and the design of a quasi-optical gyrotron are discussed.

Manheimer, Wallace M.

1989-01-01

54

FORMOSAT-5 satellite Power Distribution circuitry development  

Microsoft Academic Search

The Power Control and Distribution Unit (PCDU) in FORMOSAT-5 mission acts as the satellite power control and distribution center, is similar to a human heart. One of the modules in the PCDU, named the Power Distribution (PD), the main function provides the rated voltage and current of each power outlet for die satellite unit. When overload or short-circuit happens and

Che Cheng Huang; Chien Kai Tseng; Jia Jing Yeh

2012-01-01

55

Power Systems Development Facility. Environmental Assessment  

SciTech Connect

The objective of the PSDF would be to provide a modular facility which would support the development of advanced, pilot-scale, coal-based power systems and hot gas clean-up components. These pilot-scale components would be designed to be large enough so that the results can be related and projected to commercial systems. The facility would use a modular approach to enhance the flexibility and capability for testing; consequently, overall capital and operating costs when compared with stand-alone facilities would be reduced by sharing resources common to different modules. The facility would identify and resolve technical barrier, as well as-provide a structure for long-term testing and performance assessment. It is also intended that the facility would evaluate the operational and performance characteristics of the advanced power systems with both bituminous and subbituminous coals. Five technology-based experimental modules are proposed for the PSDF: (1) an advanced gasifier module, (2) a fuel cell test module, (3) a PFBC module, (4) a combustion gas turbine module, and (5) a module comprised of five hot gas cleanup particulate control devices. The final module, the PCD, would capture coal-derived ash and particles from both the PFBC and advanced gasifier gas streams to provide for overall particulate emission control, as well as to protect the combustion turbine and the fuel cell.

Not Available

1993-06-01

56

Kilovolt dc solid state remote power controller development  

NASA Technical Reports Server (NTRS)

The experience gained in developing and applying solid state power controller (SSPC) technology at high voltage dc (HVDC) potentials and power levels of up to 25 kilowatts is summarized. The HVDC switching devices, power switching concepts, drive circuits, and very fast acting overcurrent protection circuits were analyzed. A 25A bipolar breadboard with Darlington connected switching transistor was built. Fault testing at 900 volts was included. A bipolar transistor packaged breadboard design was developed. Power MOSFET remote power controller (RPC) was designed.

Mitchell, J. T.

1982-01-01

57

Development of a test bed for power line communications  

Microsoft Academic Search

This paper presents the development of a power line test bed which provides a platform to simulate the 230 V\\/50 Hz power line environment in a controlled and reproducible engineering manner. The target is to communicate data over power lines in the frequency range from 1 MHz to 10 MHz. This test bed is integrated with power line communication (PLC)

P. L. So; Y. H. Ma

2004-01-01

58

Development of Jet Noise Power Spectral Laws  

NASA Technical Reports Server (NTRS)

High-quality jet noise spectral data measured at the Aero-Acoustic Propulsion Laboratory (AAPL) at NASA Glenn is used to develop jet noise scaling laws. A FORTRAN algorithm was written that provides detailed spectral prediction of component jet noise at user-specified conditions. The model generates quick estimates of the jet mixing noise and the broadband shock-associated noise (BBSN) in single-stream, axis-symmetric jets within a wide range of nozzle operating conditions. Shock noise is emitted when supersonic jets exit a nozzle at imperfectly expanded conditions. A successful scaling of the BBSN allows for this noise component to be predicted in both convergent and convergent-divergent nozzles. Configurations considered in this study consisted of convergent and convergent- divergent nozzles. Velocity exponents for the jet mixing noise were evaluated as a function of observer angle and jet temperature. Similar intensity laws were developed for the broadband shock-associated noise in supersonic jets. A computer program called sJet was developed that provides a quick estimate of component noise in single-stream jets at a wide range of operating conditions. A number of features have been incorporated into the data bank and subsequent scaling in order to improve jet noise predictions. Measurements have been converted to a lossless format. Set points have been carefully selected to minimize the instability-related noise at small aft angles. Regression parameters have been scrutinized for error bounds at each angle. Screech-related amplification noise has been kept to a minimum to ensure that the velocity exponents for the jet mixing noise remain free of amplifications. A shock-noise-intensity scaling has been developed independent of the nozzle design point. The computer program provides detailed narrow-band spectral predictions for component noise (mixing noise and shock associated noise), as well as the total noise. Although the methodology is confined to single streams, efforts are underway to generate a data bank and algorithm applicable to dual-stream jets. Shock-associated noise in high-powered jets such as military aircraft can benefit from these predictions.

Khavaran, Abbas; Bridges, James

2011-01-01

59

75 FR 76455 - Coso Energy Developers; Coso Finance Partners; Coso Power Developers; Notice Of Filing  

Federal Register 2010, 2011, 2012, 2013, 2014

...Finance Partners; Coso Power Developers; Notice Of Filing December...18, 2010, Coso Energy Developers, Coso Finance Partners, and Coso Power Developers, pursuant to section 207...eSubscription'' link on the Web site that enables...

2010-12-08

60

DEVELOPMENT OF COMMUNITY POWER FROM SUSTAINABLE SMALL HYDRO POWER SYSTEMS ? ACAPACITY BUILDING PROJECT IN BANGANG, CAMEROON  

EPA Science Inventory

Electric power is one of the basic needs for the development of any community. With electric power lacking in most rural communities in Africa, providing basic amenities that are dependent on power such as clean portable drinking water, powering equipment in health and dent...

61

Wind Power and the Clean Development Mechanism  

E-print Network

power plants (build margin, BM) · Baseline emission factor is calculated as combined margin, CM Power and Least-Cost Option 0 10 20 30 40 50 60 Wind (Essaouira) Coal-Fired Coal-Oil Fired Diesel/Oil GasTurbine Oil-Fired Hydropower US$/MWh (2002 prices) Levelized generation costs in Morocco Source

62

ZERO EMISSION POWER GENERATION TECHNOLOGY DEVELOPMENT  

SciTech Connect

Clean Energy Systems (CES) was previously funded by DOE's ''Vision 21'' program. This program provided a proof-of-concept demonstration that CES' novel gas generator (combustor) enabled production of electrical power from fossil fuels without pollution. CES has used current DOE funding for additional design study exercises which established the utility of the CES-cycle for retrofitting existing power plants for zero-emission operations and for incorporation in zero-emission, ''green field'' power plant concepts. DOE funding also helped define the suitability of existing steam turbine designs for use in the CES-cycle and explored the use of aero-derivative turbines for advanced power plant designs. This work is of interest to the California Energy Commission (CEC) and the Norwegian Ministry of Petroleum & Energy. California's air quality districts have significant non-attainment areas in which CES technology can help. CEC is currently funding a CES-cycle technology demonstration near Bakersfield, CA. The Norwegian government is supporting conceptual studies for a proposed 40 MW zero-emission power plant in Stavager, Norway which would use the CES-cycle. The latter project is called Zero-Emission Norwegian Gas (ZENG). In summary, current engineering studies: (1) supported engineering design of plant subsystems applicable for use with CES-cycle zero-emission power plants, and (2) documented the suitability and availability of steam turbines for use in CES-cycle power plants, with particular relevance to the Norwegian ZENG Project.

Ronald Bischoff; Stephen Doyle

2005-01-20

63

Nanostructured Materials Development for Space Power  

NASA Technical Reports Server (NTRS)

There have been many recent advances in the use of nanostructured materials for space power applications. In particular, the use of high purity single wall nanotubes holds promise for a variety of generation and storage devices including: thin film lithium ion batteries, microelectronic proton exchange membrane (PEM) fuel cells, polymeric thin film solar cells, and thermionic power supplies is presented. Semiconducting quantum dots alone and in conjunction with carbon nanotubes are also being investigated for possible use in high efficiency photovoltaic solar cells. This paper will review some of the work being done at RIT in conjunction with the NASA Glenn Research Center to utilize nanomaterials in space power devices.

Raffaelle, Ryne P.; Landi, B. J.; Elich, J. B.; Gennett, T.; Castro, S. L.; Bailey, Sheila G.; Hepp, Aloysius F.

2003-01-01

64

Development and Demonstration of a 25 Watt Thermophotovoltaic Power Source for a Hybrid Power System  

NASA Technical Reports Server (NTRS)

The development of a propane-fueled, 25 W thermophotovoltaic (TPV) power source for use in a hybrid power system is described. The TPV power source uses a platinum emitting surface with an anti-reflective coating to radiate to gallium antimonide photocells, which converts the radiation to electric power. The development program started with the design and fabrication of an engineering prototype system. This was used as a component development vehicle to develop the technologies for the various components. A 25 W demonstration prototype was then designed and fabricated using the most advanced component approaches. The designs and test results from this development program are discussed.

Doyle, Edward; Shukla, Kailash; Metcalfe, Christopher

2001-01-01

65

A Technology Overview of the PowerChip Development Program  

E-print Network

The PowerChip research program is developing technologies to radically improve the size, integration, and performance of power electronics operating at up to grid-scale voltages (e.g., up to 200V) and low-to-moderate power ...

Araghchini, Mohammad

66

NREL Develops Sub-Hour Solar Power Data Set  

E-print Network

NREL Develops Sub-Hour Solar Power Data Set NREL data will help utilities incorporate solar energy into their electric power systems. Large-scale deployment of solar energy requires a favorable environment for interconnecting and operating solar power plants. But realizing high volumes and economies of scale

67

Solar power tower development: Recent experiences  

SciTech Connect

Recent experiences with the 10 MW{sub e} Solar Two and the 2.5 MW{sub t} TSA (Technology Program Solar Air Receiver) demonstration plants are reported. The heat transfer fluids used in these solar power towers are molten-nitrate salt and atmospheric air, respectively. Lessons learned and suggested technology improvements for next-generation plants are categorized according to subsystem. The next steps to be taken in the commercialization process for each these new power plant technologies is also presented.

Tyner, C.; Kolb, G.; Prairie, M. [and others

1996-12-01

68

Development of the NEXT Power Processing Unit  

NASA Technical Reports Server (NTRS)

Boeing Electron Dynamic Devices, Inc. (EDD) has designed and fabricated a breadboard version of a 6 kW power processing unit (PPU) for gridded ion thrusters. This breadboard PPU will be integrated with an engineering model 40 cm ion engine designed and tested at NASA Glenn. The results of our tests using resistive loads are reported in this paper. The PPU demonstrated efficiencies to date are higher than 95 percent for the beam supply and higher than 92 percent for the discharge supply at full power. Overall PPU efficiency is greater than 94 percent at full throttle settings.

Phelps, Thomas K.; Wiseman, Steve; Komm, David S.; Bond, Thomas; Pinero, Luis R.

2005-01-01

69

Solar power developer feels its technology is cost competitive  

Microsoft Academic Search

This paper reports on a solar power developer which believes that it has a cost-competitive solar power technology. Right now, more than 90% of the world's operating solar-powered electric generating capacity is located in the Los-Angeles-based company's privately financed solar-thermal plants currently operating on the Southern California Edison system. It has 274 MW of qualifying-facility, small-power solar capacity in operation

Smock

1990-01-01

70

Geothermal power development: 1984 overview and update  

Microsoft Academic Search

The status of geothermal power plants as of mid-1984 is given. There are 15 countries with active plants, and France (Guadeloupe) is expected to join the roster in the near future. The total number of operating units (defined as individual turbo-generator sets) is 145; the total installed capacity is somewhat less than 3770 MW. If plans for additional plants are

DiPippo

1984-01-01

71

Ultra-low power microwave CHFET integrated circuit development  

Microsoft Academic Search

This report summarizes work on the development of ultra-low power microwave CHFET integrated circuit development. Power consumption of microwave circuits has been reduced by factors of 50--1,000 over commercially available circuits. Positive threshold field effect transistors (nJFETs and PHEMTs) have been used to design and fabricate microwave circuits with power levels of 1 milliwatt or less. 0.7 μm gate nJFETs

A. G. Baca; V. M. Hietala; D. Greenway; L. R. Sloan; R. J. Shul; G. P. Muyshondt; D. F. Dubbert

1998-01-01

72

Smart Lighting Smart Power Smart Systems Curriculum Development Institute  

E-print Network

, power and sensor technologies and how they can be integrated into real world, sustainable and well time for collaborative curriculum development among participants and faculty. Science & / or technology1 Smart Lighting ­ Smart Power ­ Smart Systems Curriculum Development Institute Teacher Program

Salama, Khaled

73

DEVELOPMENTS IN PARTICULATE CONTROL FOR COAL-FIRED POWER PLANTS  

EPA Science Inventory

The paper discusses recent developments in particulate control for coal-fired power plants. The developments are responding to a double challenge to conventional coal-fired power plant emissions control technology: (1) lower particulate emissions require more efficient control de...

74

Advanced Power Plant Development and Analyses Methodologies  

SciTech Connect

Under the sponsorship of the U.S. Department of Energy/National Energy Technology Laboratory, a multi-disciplinary team led by the Advanced Power and Energy Program of the University of California at Irvine is defining the system engineering issues associated with the integration of key components and subsystems into advanced power plant systems with goals of achieving high efficiency and minimized environmental impact while using fossil fuels. These power plant concepts include ''Zero Emission'' power plants and the ''FutureGen'' H{sub 2} co-production facilities. The study is broken down into three phases. Phase 1 of this study consisted of utilizing advanced technologies that are expected to be available in the ''Vision 21'' time frame such as mega scale fuel cell based hybrids. Phase 2 includes current state-of-the-art technologies and those expected to be deployed in the nearer term such as advanced gas turbines and high temperature membranes for separating gas species and advanced gasifier concepts. Phase 3 includes identification of gas turbine based cycles and engine configurations suitable to coal-based gasification applications and the conceptualization of the balance of plant technology, heat integration, and the bottoming cycle for analysis in a future study. Also included in Phase 3 is the task of acquiring/providing turbo-machinery in order to gather turbo-charger performance data that may be used to verify simulation models as well as establishing system design constraints. The results of these various investigations will serve as a guide for the U. S. Department of Energy in identifying the research areas and technologies that warrant further support.

G.S. Samuelsen; A.D. Rao

2006-02-06

75

Advanced Power Plant Development and Analysis Methodologies  

SciTech Connect

Under the sponsorship of the U.S. Department of Energy/National Energy Technology Laboratory, a multi-disciplinary team led by the Advanced Power and Energy Program of the University of California at Irvine is defining the system engineering issues associated with the integration of key components and subsystems into advanced power plant systems with goals of achieving high efficiency and minimized environmental impact while using fossil fuels. These power plant concepts include 'Zero Emission' power plants and the 'FutureGen' H2 co-production facilities. The study is broken down into three phases. Phase 1 of this study consisted of utilizing advanced technologies that are expected to be available in the 'Vision 21' time frame such as mega scale fuel cell based hybrids. Phase 2 includes current state-of-the-art technologies and those expected to be deployed in the nearer term such as advanced gas turbines and high temperature membranes for separating gas species and advanced gasifier concepts. Phase 3 includes identification of gas turbine based cycles and engine configurations suitable to coal-based gasification applications and the conceptualization of the balance of plant technology, heat integration, and the bottoming cycle for analysis in a future study. Also included in Phase 3 is the task of acquiring/providing turbo-machinery in order to gather turbo-charger performance data that may be used to verify simulation models as well as establishing system design constraints. The results of these various investigations will serve as a guide for the U. S. Department of Energy in identifying the research areas and technologies that warrant further support.

A.D. Rao; G.S. Samuelsen; F.L. Robson; B. Washom; S.G. Berenyi

2006-06-30

76

Bulb Turbine Development for Hydro Power Stations  

Microsoft Academic Search

SYNOPSIS—Bulb turbines are gaining increasing importance in the generation of power from low-head schemes all over the world. Because of hydraulic advantages on the one hand and increased feasibility on the other hand they are frequently applied instead of the vertical Kaplan turbines.The following paper deals with the most essential hydraulic differences between a horizontal bulb-turbine and a vertical Kaplan-turbine

F. Strohmer; P. Spitaler

1980-01-01

77

Curriculum Reform, Professional Development, and Powerful Learning  

NSDL National Science Digital Library

The authors consider the important relationship between standards-based curriculum implementation and professional development. They begin by looking at the key recommendations about student learning and then discuss how curriculum materials can embody these recommendations. Because the result is nontraditional curriculum materials, they then consider the role of professional development for increasing the effectiveness of those materials. Finally, they discuss a professional development strategy that begins with selecting materials for curriculum reform.

James B. Short

2002-01-01

78

Methods for generating hydroelectric power development alternatives  

Microsoft Academic Search

Hydropower development on large rivers can result in a number of environmental impacts, including potential reductions in dissolved oxygen (DO) concentrations. This study presents a methodology for generating different hydropower development alternatives for evaluation. This methodology employs a Streeter-Phelps model to simulate DO, and the Bounded Implicit Enumeration algorithm to solve an optimization model formulated to maximize hydroelectric energy production

Shoou-yuh Chang; Shu-liang Liaw; Michael J. Sale; Steven F. Railsback

1989-01-01

79

Development of cosmic ray hardened power MOSFET's  

NASA Astrophysics Data System (ADS)

Developmental power DMOS (double-diffused metal-oxide-semiconductor) FETs were thoroughly characterized in a simulated cosmic-ray environment using heavy ions at the Brookhaven National Laboratory's tandem Van de Graaff accelerator facility. The primary failure mode encountered on FETs in this environment was susceptibility to single-event burnout. Burnout of the power DMOS FET was catastrophic. Another failure mode was single-event gate rupture. Although gate rupture is not as severe as burnout, its long-term effects are not known. Single-event gate rupture causes performance degradation due to increased gate leakage current. An increase in current can pose serious problems for applications that cannot compensate for the added performance degradation. Long-term reliability of the gate oxide may be affected, resulting in premature device failure. Numerous processing lots were fabricated to verify experimentally that each failure mode could be successfully minimized. Test results have shown that an n-channel, 150-V DMOS FET survived exposures to ions with linear energy transfers up to 80 MeV-sq cm/mg. Hardening approaches are discussed, including their advantages and disadvantages in relation to the FET's performance.

Titus, Jeffrey L.; Jamiolkowski, Linda S.; Wheatley, C. Frank

1989-12-01

80

NASA's Advanced Radioisotope Power Conversion Technology Development Status  

NASA Technical Reports Server (NTRS)

NASA's Advanced Radioisotope Power Systems (ARPS) project is developing the next generation of radioisotope power conversion technologies that will enable future missions that have requirements that cannot be met by either photovoltaic systems or by current radioisotope power systems (RPSs). Requirements of advanced RPSs include high efficiency and high specific power (watts/kilogram) in order to meet future mission requirements with less radioisotope fuel and lower mass so that these systems can meet requirements for a variety of future space applications, including continual operation surface missions, outer-planetary missions, and solar probe. These advances would enable a factor of 2 to 4 decrease in the amount of fuel required to generate electrical power. Advanced RPS development goals also include long-life, reliability, and scalability. This paper provides an update on the contractual efforts under the Radioisotope Power Conversion Technology (RPCT) NASA Research Announcement (NRA) for research and development of Stirling, thermoelectric, and thermophotovoltaic power conversion technologies. The paper summarizes the current RPCT NRA efforts with a brief description of the effort, a status and/or summary of the contractor's key accomplishments, a discussion of upcoming plans, and a discussion of relevant system-level benefits and implications. The paper also provides a general discussion of the benefits from the development of these advanced power conversion technologies and the eventual payoffs to future missions (discussing system benefits due to overall improvements in efficiency, specific power, etc.).

Anderson, David J.; Sankovic, John; Wilt, David; Abelson, Robert D.; Fleurial, Jean-Pierre

2007-01-01

81

Radioisotope-based Nuclear Power Strategy for Exploration Systems Development  

SciTech Connect

Nuclear power will play an important role in future exploration efforts. Its benefits pertain to practically all the different timeframes associated with the Exploration Vision, from robotic investigation of potential lunar landing sites to long-duration crewed missions on the lunar surface. However, the implementation of nuclear technology must follow a logical progression in capability that meets but does not overwhelm the power requirements for the missions in each exploration timeframe. It is likely that the surface power infrastructure, particularly for early missions, will be distributed in nature. Thus, nuclear sources will have to operate in concert with other types of power and energy storage systems, and must mesh well with the power architectures envisioned for each mission phase. Most importantly, they must demonstrate a clear advantage over other non-nuclear options (e.g., solar power, fuel cells) for their particular function. This paper describes a strategy that does this in the form of three sequential system developments. It begins with use of radioisotope generators currently under development, and applies the power conversion technology developed for these units to the design of a simple, robust reactor power system. The products from these development efforts would eventually serve as the foundation for application of nuclear power systems for exploration of Mars and beyond.

Schmidt, George R.; Houts, Michael G. [NASA Marshall Space Flight Center, Huntsville, AL 35812 (United States)

2006-01-20

82

Geothermal power development: 1984 overview and update  

SciTech Connect

The status of geothermal power plants as of mid-1984 is given. There are 15 countries with active plants, and France (Guadeloupe) is expected to join the roster in the near future. The total number of operating units (defined as individual turbo-generator sets) is 145; the total installed capacity is somewhat less than 3770 MW. If plans for additional plants are met, the total could jump by more than 200 MW over the next two years. Recent growth is presented and the worldwide installed capacity is traced. A graphic portrayal of the growth pattern is presented. The countries that will be most responsible for sustaining this growth are the US, the Philippines, Mexico, and Indonesia. Other countries that will contribute significantly include Italy, Japan, Kenya, Nicaragua, and Turkey. The following countries do not now have any geothermal plants but may bring some online by 1990: Guatemala, Costa Rica, Greece, St. Lucia, Thailand, and Ethiopia.

DiPippo, R.

1984-10-01

83

Practical superconductor development for electrical power applications  

SciTech Connect

Development of useful high-critical-temperature (high-[Tc]) superconductors requires synthesis of superconducting compounds; fabrication of wires, tapes, and films from these compounds; production of composite structures that incorporate stabilizers or insulators; and design and testing of efficient components. This report describes the technical progress of research and development efforts aimed at producing superconducting components that are based on the Y-Ba-Cu, Bi-Sr-Ca-Cu, Bi-Pb-Sr-Ca-Cu, and (TI,Pb)-(Ba,Sr)-Ca-Cu oxide systems. Topics discussed are synthesis and heat treatment of high-[Tc] superconductors, formation of monolithic and composite wires and tapes, superconductor/metal connectors, characterization of structures and superconducting and mechanical properties, fabrication and properties of thin films, and development of prototype components. Collaborations with industry and academia are documented.

Goretta, K.C. (comp.)

1992-10-01

84

Technology development issues in space nuclear power for planetary exploration  

NASA Technical Reports Server (NTRS)

Planning for future planetary exploration missions indicates that there are continuing, long range requirements for nuclear power, and in particular radioisotope-based power sources. In meeting these requirements, there is a need for higher efficiency, lower mass systems. Four technology areas currently under development that address these goals are described: modular RTG, modular RTG with advanced thermoelectric materials, dynamic isotope power system (DIPS), and the Alkali Metal Thermoelectric Converter (AMTEC).

Bankston, C. P.; Atkins, K. L.; Mastal, E. F.; Mcconnell, D. G.

1990-01-01

85

Photovoltaic power conditioners: Development, evolution, and the next generation  

SciTech Connect

Market-place acceptance of utility-connected photovoltaic (PV) power generation systems and their accelerated installation into residential and commercial applications are heavily dependent upon the ability of their power conditioning subsystems (PCS) to meet high reliability, low cost, and high performance goals. Many PCS development efforts have taken place over the last 15 years, and those efforts have resulted in substantial PCS hardware improvements. These improvements, however, have generally fallen short of meeting many reliability, cost and performance goals. Continuously evolving semiconductor technology developments, coupled with expanded market opportunities for power processing, offer a significant promise of improving PCS reliability, cost and performance, as they are integrated into future PCS designs. This paper revisits past and present development efforts in PCS design, identifies the evolutionary improvements and describes the new opportunities for PCS designs. The new opportunities are arising from the increased availability and capability of semiconductor switching components, smart power devices, and power integrated circuits (PICS).

Bulawka, A. [USDOE, Washington, DC (United States); Krauthamer, S.; Das, R. [Jet Propulsion Lab., Pasadena, CA (United States); Bower, W. [Sandia National Labs., Albuquerque, NM (United States)

1994-07-01

86

Nuclear Power in Developing Countries: The Transfer of Regulatory Capability  

Microsoft Academic Search

By 1985, 17 developing countries will each have at least one nuclear power plant in operation The natural desire of these countries to acquire some capability in the implementation of nuclear power projects, requires that special emphasis be given to pro- grammes for the transfer of industrial technology. This, however, can detract attention from a vital area of technology transfer

M. Rosen

87

Development of prototype FES-rowing Power Rehabilitation equipment  

Microsoft Academic Search

Most types of resistance training equipment for exercise are designed for healthy people with higher fitness levels, but the equipment used in Power Rehabilitation is designed exclusively for rehabilitating the elderly, and even disabled individuals. The purpose of this study was to develop power rehabilitation equipment for wheel-chair users or elderly people with limited mobility. We devised the prototypical FES-rowing

Mineyoshi Sato; Yoichi Shimada; Takehiro Iwami; Kazuto Miyawaki; Toshiki Matsunaga; Satoaki Chida; Kazutoshi Hatakeyama

88

Development of Condition Monitoring Instrumentation for Sensing Power Transformers  

Microsoft Academic Search

The objective of this work is the design and development of the Data Acquisition and Storage parts of a measurement system that will be used for the Condition Monitoring (CM) of Power Transformers. The data captured from the sensors and stored in a database will be used by an application that will predict the behavior of the Power Transformer. Data

Perfecto Mariño; Francisco Poza; Santiago Otero; Fernando Machado

89

Power Mechanics Curriculum Guide. Curriculum Development. Bulletin 1813.  

ERIC Educational Resources Information Center

This model instructional unit was developed to aid trade and industrial education teachers in Louisiana in preparing students for careers in the field of power mechanics. Students are provided experiences related to the design, theory, construction, and appropriate uses of the power systems, as well as the maintenance and repair of the more common…

Territo, Peter A., Jr.; McMurry, James G.

90

Power Systems Engineering Research Center Education for Workforce Development  

E-print Network

an online library of short (i.e., 15-20 minute) videos on various topics of sustainable energy systemsPower Systems Engineering Research Center Education for Workforce Development: A PSERC Future Grid of the emerging power grid with heavy penetration of renewables and massive deployment of computer

Van Veen, Barry D.

91

Practical superconductor development for electrical power applications  

SciTech Connect

Development of useful high-critical-temperature (high-{Tc}) superconductors requires synthesis of superconducting compounds; fabrication of wires, tapes, and films from these compounds; production of composite structures that incorporate stabilizers or insulators; and design and testing of efficient components. This report describes technical progress of research and development efforts aimed at producing superconducting components based on the Y-Ba-Cu, Bi-Sr-Ca-Cu, Bi-Pb-Sr-Ca-Cu, and Tl-Ba-Ca-Cu oxides systems. Topics discussed are synthesis and heat treatment of high-{Tc} superconductors, formation of monolithic and composite wires and tapes, superconductor/metal connectors, characterization of structures and superconducting and mechanical properties, and fabrication and properties of thin films. Collaborations with industry and academia are also documented. 10 figs.

Goretta, K.C. (comp.)

1991-10-01

92

The 20 GHz power GaAs FET development  

NASA Technical Reports Server (NTRS)

The development of power Field Effect Transistors (FET) operating in the 20 GHz frequency band is described. The major efforts include GaAs FET device development (both 1 W and 2 W devices), and the development of an amplifier module using these devices.

Crandell, M.

1986-01-01

93

PFBC perspectives at the Power Systems Development Facility  

SciTech Connect

The use of coal for power generation has come under increasing environmental scrutiny over the past five years. Advances in coal-based power generation technology will develop systems that have high efficiency, environmental superiority and lower cost of electricity compared to current coal-based technology. Advanced pressurized-fluidized-bed combustion (APFBC) is one `of the promising emerging power generation technologies striving to achieve these goals. One method of improving the efficiency and lowering the capital cost further for advanced power plants utilizing coal is by employing hot gas cleanup. Although hot gas cleanup has the potential for improving the viability of coal-based power generation, the removal of hot particulates from the gas stream has proven to be a challenging task. The demonstration of APFBC technology and the particulate control devices (PCDs) under realistic conditions for advanced power generation remain important areas for development. The Power Systems Development Facility (PSDF) is being designed to be a flexible facility that will address the development of the PCDs and an advanced second-generation PFBC technology. With the progress made in the last decade, the basic concepts of PFBC technology can be achieved through a number of different flowsheets and reactor configurations. The choices made in developing the flowsheets and the choices made in designing the equipment in order to improve the reliability of operation may well dictate, along with the actual data from operation, the process efficiencies and the capital costs that can be achieved.

Moore, D.L.; Vimalchand, P.; Haq, Z.U. [Southern Co. Services, Inc., Birmingham, AL (United States); McClung, J.D. [Foster Wheeler Development Corp., Livingston, NJ (United States); Quandt, M.T. [Foster Wheeler Energy Corp., Clinton, NJ (United States)

1994-06-01

94

High-Power, High-Temperature Superconductor Technology Development  

NASA Technical Reports Server (NTRS)

Since the first discovery of high-temperature superconductors (HTS) 10 years ago, the most promising areas for their applications in microwave systems have been as passive components for communication systems. Soon after the discovery, experiments showed that passive microwave circuits made from HTS material exceeded the performance of conventional devices for low-power applications and could be 10 times as small or smaller. However, for superconducting microwave components, high-power microwave applications have remained elusive until now. In 1996, DuPont and Com Dev Ltd. developed high-power superconducting materials and components for communication applications under a NASA Lewis Research Center cooperative agreement, NCC3-344 "High Power High Temperature Superconductor (HTS) Technology Development." The agreement was cost shared between the Defense Advanced Research Projects Agency's (DARPA) Technology Reinvestment Program Office and the two industrial partners. It has the following objectives: 1) Material development and characterization for high-power HTS applications; 2) Development and validation of generic high-power microwave components; 3) Development of a proof-of-concept model for a high-power six-channel HTS output multiplexer.

Bhasin, Kul B.

2005-01-01

95

Technological implications of SNAP reactor power system development on future space nuclear power systems  

SciTech Connect

Nuclear reactor systems are one method of satisfying space mission power needs. The development of such systems must proceed on a path consistent with mission needs and schedules. This path, or technology roadmap, starts from the power system technology data base available today. Much of this data base was established during the 1960s and early 1970s, when government and industry developed space nuclear reactor systems for steady-state power and propulsion. One of the largest development programs was the Systems for Nuclear Auxiliary Power (SNAP) Program. By the early 1970s, a technology base had evolved from this program at the system, subsystem, and component levels. There are many implications of this technology base on future reactor power systems. A review of this base highlights the need for performing a power system technology and mission overview study. Such a study is currently being performed by Rockwell's Energy Systems Group for the Department of Energy and will assess power system capabilities versus mission needs, considering development, schedule, and cost implications. The end product of the study will be a technology roadmap to guide reactor power system development.

Anderson, R.V.

1982-11-16

96

Development and Utilization of Space Fission Power Systems  

NASA Technical Reports Server (NTRS)

Space fission power systems could enable advanced civilian space missions. Terrestrially, thousands of fission systems have been operated since 1942. In addition, the US flew a space fission system in 1965, and the former Soviet Union flew 33 such systems prior to the end of the Cold War. Modern design and development practices, coupled with 65 years of experience with terrestrial reactors, could enable the affordable development of space fission power systems for near-term planetary surface applications.

Houts, Michael; Mason, Lee S.; Palac, Donald T.; Harlow, Scott E.

2008-01-01

97

Development and Utilization of Space Fission Power Systems  

NASA Technical Reports Server (NTRS)

Space fission power systems could enable advanced civilian space missions. Terrestrially, thousands of fission systems have been operated since 1942. In addition, the US flew a space fission system in 1965, and the former Soviet Union flew 33 such systems prior to the end of the Cold War. Modern design and development practices, coupled with 65 years of experience with terrestrial reactors, could enable the affordable development of space fission power systems for near-term planetary surface applications.

Houts, Michael G.; Mason, Lee S.; Palac, Donald T.; Harlow, Scott E.

2009-01-01

98

Advanced Radioisotope Power Conversion Technology Research and Development  

NASA Technical Reports Server (NTRS)

NASA's Radioisotope Power Conversion Technology program is developing next generation power conversion technologies that will enable future missions that have requirements that cannot be met by either the ubiquitous photovoltaic systems or by current Radioisotope Power System (RPS) technology. Performance goals of advanced radioisotope power systems include improvement over the state-of-practice General Purpose Heat Source/Radioisotope Thermoelectric Generator by providing significantly higher efficiency to reduce the number of radioisotope fuel modules, and increase specific power (watts/kilogram). Other Advanced RPS goals include safety, long-life, reliability, scalability, multi-mission capability, resistance to radiation, and minimal interference with the scientific payload. NASA has awarded ten contracts in the technology areas of Brayton, Stirling, Thermoelectric, and Thermophotovoltaic power conversion including five development contracts that deal with more mature technologies and five research contracts. The Advanced RPS Systems Assessment Team includes members from NASA GRC, JPL, DOE and Orbital Sciences whose function is to review the technologies being developed under the ten Radioisotope Power Conversion Technology contracts and assess their relevance to NASA's future missions. Presented is an overview of the ten radioisotope power conversion technology contracts and NASA's Advanced RPS Systems Assessment Team.

Wong, Wayne A.

2004-01-01

99

On applicability of reciprocating flow turbines developed for wave power to tidal power conversion  

Microsoft Academic Search

Tidal power generation with reciprocating turbines in a simple system is investigated on a performance simulation in order to enlarge the capability of practical use of tidal power with extra-low head and time-varying energy density characteristics. Four reciprocating turbines, which are two types of impulse and a Wells developed for wave power conversion systems, and a cross-flow type of Darrieus

K. Takenouchi; K. Okuma; A. Furukawa; T. Setoguchi

2006-01-01

100

Development of Sub-Millimeter-Wave Power Amplifiers  

NASA Astrophysics Data System (ADS)

In this paper, we present the framework for developing the first working power amplifiers at sub-millimeter-wave frequencies. The technology is made possible by an advanced InP HEMT transistor. A three-stage power amplifier is presented, which uses a binary combiner to realize a total output periphery of 80 mum and demonstrates 12-dB gain at 335 GHz, making, this the first demonstrated sub-millimeter-wave power amplifier. Measured saturated power of 2 mW at 330 GHz is also presented, which provides a transistor power benchmark of 25 mW/mm at 330 GHz. Finally, single-stage amplifier data with large periphery transistors are presented, which demonstrates 5-dB measured gain at 230 GHz and positive measured S21 gain to ~300 GHz, demonstrating that power amplifiers using larger transistors are feasible at these frequencies as well.

Deal, William R.; Mei, X. B.; Radisic, Vesna; Lange, Michael D.; Yoshida, Wayne; Liu, Po-Hsin; Uyeda, Jansen; Barsky, Michael E.; Fung, Andy; Gaier, Todd; Lai, Richard

2007-12-01

101

Development of ceramic superconductors for electric power applications  

SciTech Connect

The U.S. Department of Energy supports an applied superconductivity program entitled {open_quotes}Superconductivity Program for Electric Power Systems.{close_quotes} Activities under this program are designed to help develop the high-temperature superconductor (HTS) technology that is needed for industry to proceed with the commercial development of electric power applications. Research is conducted in three categories: wire development, systems technology development, and Superconductivity Partnership Initiative (SPI). Wire development activities are devoted to improving the critical current density (J{sub c}) of short-length HTS wire, whereas activities in systems technology development focus on fabrication of long-length wires, coils, and magnets. Finally, SPI activities focus on the development of prototypes that consist of a generator coil, a fault current limiter, a transmission cable, and a motor. A current overview and recent progress in the development of HTSs are outlined in this paper. 48 refs., 6 figs.

Balachandran, U.

1997-03-01

102

Development status of the heatpipe power and bimodal systems  

SciTech Connect

Space fission power systems can potentially enhance or enable ambitious lunar and Martian surface missions. Research into space fission power systems has been ongoing (at various levels) since the 1950s, but to date the United States (US) has flown only one space fission system, SNAP-10A, in 1965. Cost and development time have been significant reasons why space fission systems have not been used by the US. High cost and long development time are not inherent to the use of space fission power. However, high cost and long development time are inherent to any program that tries to do too much at once. Nearly all US space fission power programs have attempted to field systems capable of high power, even though more modest systems had not yet been flown. All of these programs have failed to fly a space fission system. Relatively low power (10 to 100 kWe) fission systems may be useful for near-term lunar and Martian surface missions, including missions in which in situ resource utilization is a priority. Such systems may also be useful for deep-space science missions and other missions. These systems can be significantly less expensive to develop than high power systems. Experience gained in the development of low-power space fission systems can then be used to enable cost-effective development of high-power ({gt}1000 kWe) fission systems. The Heatpipe Power System (HPS) is a potential, near-term, low-cost space fission power system. The Heatpipe Bimodal System (HBS) is a potential, near-term, low-cost space fission power and/or propulsion system. Both systems will be composed of independent modules, and all components use existing technology and operate within the existing database. The HPS and HBS have relatively few system integration issues; thus, the successful development of a module is a significant step toward verifying system feasibility and performance estimates. A prototypic HPS module was fabricated, and initial testing was completed in April 1997. All test objectives were accomplished, demonstrating the basic feasibility of the HPS. Fabrication of an HBS module is under way, and testing should begin in 1999. {copyright} {ital 1999 American Institute of Physics.}

Poston, David I.; Houts, Michael G. [Nuclear Systems Design and Analysis Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)] Emrich, William J., Jr. [NASA Marshall Spaceflight Center, PS05, Huntsville, Alabama 35738 (United States)

1999-01-01

103

Development status of the heatpipe power and bimodal systems  

SciTech Connect

Space fission power systems can potentially enhance or enable ambitious lunar and Martian surface missions. Research into space fission power systems has been ongoing (at various levels) since the 1950s, but to date the United States (US) has flown only one space fission system, SNAP-10A, in 1965. Cost and development time have been significant reasons why space fission systems have not been used by the US. High cost and long development time are not inherent to the use of space fission power. However, high cost and long development time are inherent to any program that tries to do too much at once. Nearly all US space fission power programs have attempted to field systems capable of high power, even though more modest systems had not yet been flown. All of these programs have failed to fly a space fission system. Relatively low power (10 to 100 kWe) fission systems may be useful for near-term lunar and Martian surface missions, including missions in which in situ resource utilization is a priority. Such systems may also be useful for deep-space science missions and other missions. These systems can be significantly less expensive to develop than high power systems. Experience gained in the development of low-power space fission systems can then be used to enable cost-effective development of high-power (>1000 kWe) fission systems. The Heatpipe Power System (HPS) is a potential, near-term, low-cost space fission power system. The Heatpipe Bimodal System (HBS) is a potential, near-term, low-cost space fission power and/or propulsion system. Both systems will be composed of independent modules, and all components use existing technology and operate within the existing database. The HPS and HBS have relatively few system integration issues; thus, the successful development of a module is a significant step toward verifying system feasibility and performance estimates. A prototypic HPS module was fabricated, and initial testing was completed in April 1997. All test objectives were accomplished, demonstrating the basic feasibility of the HPS. Fabrication of an HBS module is under way, and testing should begin in 1999.

Poston, David I.; Houts, Michael G. [Nuclear Systems Design and Analysis Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Emrich, William J. Jr. [NASA Marshall Spaceflight Center, PS05, Huntsville, Alabama 35738 (United States)

1999-01-22

104

Development status of the small community solar power system  

NASA Technical Reports Server (NTRS)

The development status and test results for the Small Community Solar Thermal Power Experiment are presented. Activities on the phase 2 power module development effort are presented with emphasis on the receiver, the plant control subsystem, and the energy transport subsystem. The components include a single prototype power module consisting of a parabolic dish concentrator, a power conversion assembly (PCA), and a multiple-module plant control subsystem. The PCA consists of a cavity receiver coupled to an organic Rankine cycle engine-alternator unit defined as the power conversion subsystem; the PCA is mounted at the focus of a parabolic dish concentrator. At a solar insolation of 100 W/sq m and ambient temperature of 28 C (82 F), the power module produces approximately 20 kW of 3-phase, 3 kHz ac power, depending on the concentrator employed. A ground-mounted rectifier to the central collection site where it is supplied directly to the common dc bus which collects the power from all modules in the plant.

Pons, R. L.

1982-01-01

105

Ultra-low power microwave CHFET integrated circuit development  

SciTech Connect

This report summarizes work on the development of ultra-low power microwave CHFET integrated circuit development. Power consumption of microwave circuits has been reduced by factors of 50--1,000 over commercially available circuits. Positive threshold field effect transistors (nJFETs and PHEMTs) have been used to design and fabricate microwave circuits with power levels of 1 milliwatt or less. 0.7 {micro}m gate nJFETs are suitable for both digital CHFET integrated circuits as well as low power microwave circuits. Both hybrid amplifiers and MMICs were demonstrated at the 1 mW level at 2.4 GHz. Advanced devices were also developed and characterized for even lower power levels. Amplifiers with 0.3 {micro}m JFETs were simulated with 8--10 dB gain down to power levels of 250 microwatts ({mu}W). However 0.25 {micro}m PHEMTs proved superior to the JFETs with amplifier gain of 8 dB at 217 MHz and 50 {mu}W power levels but they are not integrable with the digital CHFET technology.

Baca, A.G.; Hietala, V.M.; Greenway, D.; Sloan, L.R.; Shul, R.J.; Muyshondt, G.P.; Dubbert, D.F.

1998-04-01

106

Development of molten carbonate fuel cell power plant technology  

Microsoft Academic Search

During this quarter, effort was continued in all four major task areas: system studies to define the reference power plant design; cell and stack design, development and verification; preparation for fabrication and testing of the full-scale prototype stack; and developing the capability for operation of stacks on coal-derived gas. Preliminary module and cell stack design requirements were completed. Fuel processor

H. C. Healy; R. A. Sanderson; F. J. Wertheim; P. F. Farris; A. P. Mientek; D. L. Maricle; T. A. Briggs; J. L. Preston Jr.; G. A. Louis; M. L. Abrams

1980-01-01

107

Development of high frequency low weight power magnetics for aerospace power systems  

NASA Technical Reports Server (NTRS)

A dominant design consideration in the development of space type power mangetic devices is the application of reliable thermal control methods to prevent device failure which is due to excessive temperature rises and hot temperatures in critical areas. The resultant design must also yield low weight, high efficiency, high reliability and maintainability, and long life. The weight savings and high efficiency that results by going to high frequency and unique thermal control techniques is demonstrated by the development of a 25 kVA, 20 kHz space type transformer under the power magnetics technology program. Work in the area of power rotary transformer is also discussed.

Schwarze, G. E.

1984-01-01

108

Tokamak Physics Experiment (TPX) power supply design and development  

SciTech Connect

The Tokamak Physics Experiment (TPX) is an advanced tokamak project aimed at the production of quasi-steady state plasmas with advanced shape, heating, and particle control. TPX is to be built at the Princeton Plasma Physics Laboratory (PPPL) using many of the facilities from the Tokamak Fusion Test Reactor (TFTR). TPX will be the first tokamak to utilize superconducting (SC) magnets in both the toroidal field (TF) and poloidal field (PF) systems. This new feature requires a departure from the traditional tokamak power supply schemes. This paper describes the plan for the adaptation of the PPPL/FTR power system facilities to supply TPX. Five major areas are addressed, namely the AC power system, the TF, PF and Fast Plasma Position Control (FPPC) power supplies, and quench protection for the TF and PF systems. Special emphasis is placed on the development of new power supply and protection schemes.

Neumeyer, C. [Raytheon Engineers and Constructors, Princeton, NJ (United States). EBASCO Div.; Bronner, G.; Lu, E.; Ramakrishnan, S. [Princeton Univ., NJ (United States). Plasma Physics Lab.

1995-04-01

109

Development of a multikilowatt ion thruster power processor  

NASA Technical Reports Server (NTRS)

A feasibility study was made of the application of silicon-controlled, rectifier series, resonant inverter, power conditioning technology to electric propulsion power processing operating from a 200 to 400 Vdc solar array bus. A power system block diagram was generated to meet the electrical requirements of a 20 CM hollow cathode, mercury bombardment, ion engine. The SCR series resonant inverter was developed as a primary means of power switching and conversion, and the analog signal-to-discrete-time-interval converter control system was applied to achieve good regulation. A complete breadboard was designed, fabricated, and tested with a resistive load bank, and critical power processor areas relating to efficiency, weight, and part count were identified.

Schoenfeld, A. D.; Goldin, D. S.; Biess, J. J.

1972-01-01

110

Developing Secure Power Systems Professional Competence: Alignment and Gaps in Workforce Development Programs—Summary Report  

SciTech Connect

This document is a summarization of the report, Developing Secure Power Systems Professional Competence: Alignment and Gaps in Workforce Development Programs, the final report for phase 2 of the SPSP (DOE workforce study) project.

O'Neil, Lori Ross; Assante, Michael; Tobey, D. H.; Conway, T. J.; Vanderhorst, Jr, T. J.; Januszewski, III, J.; Leo, R.; Perman, K.

2013-07-01

111

Repetitive high energy pulsed power technology development for industrial applications  

SciTech Connect

The technology base for Repetitive High Energy Pulsed Power (RHEPP) was originally developed to support defense program applications. As RHEPP technology matures, its potential for use in commercial applications can be explored based on inherent strengths of high average power, high dose rate, cost efficient scaling with power, and potential for long life performance. The 300 kW, 2 MeV RHEPP II accelerator is now in operation as a designated DOE User Facility, exploring applications where high dose-rate ({gt}10{sup 8}Gy/s) may be advantageous, or very high average power is needed to meet throughput requirements. Material surface and bulk property modification, food safety, and large-scale timber disinfestation are applications presently under development. Work is also in progress to generate the reliability database required for the design of 2{sup nd} generation systems. {copyright} {ital 1997 American Institute of Physics.}

Schneider, L.X.; Reed, K.W.; Kaye, R.J. [Sandia National Laboratories, Albuquerque, New Mexico 87185-1152 (United States)

1997-02-01

112

Development of HTS power cable using YBCO coated conductor  

NASA Astrophysics Data System (ADS)

Reductions of AC losses and of cost of HTS power cables are important to put it into practical power networks. Since an YBCO-coated-conductor (YBCO tape) has higher Jc and better magnetic property than a Bi2223-Ag-sheathed-tape, an AC power cable using YBCO tapes will obtain higher performance than XLPE-cables and HTS cables using BSCCO tapes in future. Especially, an YBCO HTS cable will be expected to become a higher economical cable than a Bi cable because an YBCO tape reduced its AC losses and its wire cost. We have started developing HTS power cables using YBCO tapes. Mechanical properties, superconducting properties and other electro magnetic properties of YBCO tapes have been measured to estimate the applicability to the HTS cable. Moreover, we have developed some technologies to bring out latent potentials of YBCO tapes.

Mukoyama, Shinichi; Yagi, Masashi; Hirano, Hironobu; Yamada, Yutaka; Izumi, Teruo; Shiohara, Yuh

2006-10-01

113

On the Development of Low Power MAC Protocol for WBANs  

E-print Network

Current advances in wireless communication, microelectronics, semiconductor technologies, and intelligent sensors have contributed to the development of unobtrusive WBANs. These networks provide long term health monitoring of patients without any constraint in their normal activities. Traditional MAC protocols do not accommodate the assorted WBAN traffic requirements in a power efficient manner. In this paper, we present a brief discussion on the development process of a low power MAC protocol for WBANs. We observe the behavior of a beacon-enabled IEEE 802.15.4 for on-body sensor networks. We further propose a low power technique called traffic based wakeup mechanism for a WBAN that exploits the traffic patterns of the BAN Nodes to ensure power efficient and reliable communication.

Ullah, Sana; Kwak, Kyung Sup

2009-01-01

114

Current and future developments in diesel powered hovercraft  

NASA Astrophysics Data System (ADS)

After evaluating the development status of the application of diesel power to air-cushion vehicles (ACVs) and surface-effect ships (SESs), attention is given to the AP1-88 ACV, which is both the first and largest operational diesel-powered amphibious craft of this type. An account is given of the ACV and SES features that are dictated by the need to accommodate diesel power sources; the major advantages and disadvantages of diesel (vs gas turbine) engines are discussed. Although cost reductions are achievable against gas turbine powerplant use, lower payload fractions and slightly lower performance capabilities appear to be inescapable.

Leonard, J. C.; Stevens, M. J.; Buttigieg, J. A.

115

Infrastructure development assistance modeling for nuclear power plant  

SciTech Connect

The purpose of this paper is to develop a model, a general frame to be utilized in assisting newcomer countries to start a nuclear power program. A nuclear power plant project involves technical complexity and high level of investment with long duration. Considering newcomers are mostly developing countries that lack the national infrastructure, key infrastructure issues may constitute the principal constraints to the development of a nuclear power program. In this regard, it is important to provide guidance and support to set up an appropriate infrastructure when we help them with the first launch of nuclear power plant project. To date, as a sole nuclear power generation company, KHNP has been invited many times to mentor or assist newcomer countries for their successful start of a nuclear power program since Republic of Korea is an exemplary case of a developing country which began nuclear power program from scratch and became a major world nuclear energy country in a short period of time. Through hosting events organized to aid newcomer countries' initiation of nuclear power projects, difficulties have been recognized. Each event had different contents according to circumstances because they were held as an unstructured and one-off thing. By developing a general model, we can give more adequate and effective aid in an efficient way. In this paper, we created a model to identify necessary infrastructures at the right stage, which was mainly based on a case of Korea. Taking into account the assistance we received from foreign companies and our own efforts for technological self-reliance, we have developed a general time table and specified activities required to do at each stage. From a donor's perspective, we explored various ways to help nuclear infrastructure development including technical support programs, training courses, and participating in IAEA technical cooperation programs on a regular basis. If we further develop the model, the next task would be to make the model more sophisticated as a 'semi-tailored model' so that it can be applied to a certain country reflecting its unique conditions. In accordance with its degree of established infrastructure, we can adjust or modify the model. Despite lots of benefits of using this model, there remain limitations such as time and budget constraints. These problems, however, can be addressed by cooperating with international organization such as the IAEA and other companies that share the same goal of helping newcomer countries introduce nuclear power. (authors)

Park, J. H.; Hwang, K.; Park, K. M.; Kim, S. W.; Lee, S. M. [Korea Hydro and Nuclear Power Co., LTD, 23, 106 gil, Yeongdong-daero, Gangnam-gu, 153-791 (Korea, Republic of)

2012-07-01

116

Geothermal Power Development Resource Evaluation Aspects for Kyushu Electric Power Co., Inc., Fukuoka, Japan  

SciTech Connect

This report is a limited review of and presents comments on the geothermal resource exploration program of Kyushu Electric Power Company (KEPCO). This program is for developing geothermal resources to generate electric power on Kyushu Island, Japan. Many organizations in Japan and in particular Kyushu Electric Power Co., Inc. are actively exploring for and developing geothermal resources on Kyushu Island. KEPCO has already demonstrated an ability and expertise to explore for geothermal resources by their successful exploration and subsequent development of several fields (Hatchobaru and Otake) on the island of Kyushu for electric power generation. The review and comments are made relative to the geothermal resource aspects of Kyushu Electric Power Company's geothermal exploration program, and within the time, budget, and scope of the Rogers Engineering's effort under the existing contract. Rogers and its consultants have had a wide variety of geothermal exploration experience and have used such experience in the analysis of what has been presented by KEPCO. The remainder of the introduction section develops general knowledge concerning geothermal power development with particular emphasis on the resource exploration. The data received section describes the information available to perform the project work. There are no interpretative parts to the data received section. The philosophy section relates our understanding of the KEPCO thinking and conditions surrounding current geothermal resource development in Japan. The survey and methods sections presents three important items about each study KEPCO has performed in the resource exploration program. These three aspects are: what should be obtained from the method, what data was obtained and presented, and what is a review and analysis of where the KEPCO exploration program is currently in terms of progress and successful location of reservoirs. The final section presents recommendations on the many aspects of the resource exploration for geothermal power development.

None

1980-10-30

117

Soft-Fault Detection Technologies Developed for Electrical Power Systems  

NASA Technical Reports Server (NTRS)

The NASA Glenn Research Center, partner universities, and defense contractors are working to develop intelligent power management and distribution (PMAD) technologies for future spacecraft and launch vehicles. The goals are to provide higher performance (efficiency, transient response, and stability), higher fault tolerance, and higher reliability through the application of digital control and communication technologies. It is also expected that these technologies will eventually reduce the design, development, manufacturing, and integration costs for large, electrical power systems for space vehicles. The main focus of this research has been to incorporate digital control, communications, and intelligent algorithms into power electronic devices such as direct-current to direct-current (dc-dc) converters and protective switchgear. These technologies, in turn, will enable revolutionary changes in the way electrical power systems are designed, developed, configured, and integrated in aerospace vehicles and satellites. Initial successes in integrating modern, digital controllers have proven that transient response performance can be improved using advanced nonlinear control algorithms. One technology being developed includes the detection of "soft faults," those not typically covered by current systems in use today. Soft faults include arcing faults, corona discharge faults, and undetected leakage currents. Using digital control and advanced signal analysis algorithms, we have shown that it is possible to reliably detect arcing faults in high-voltage dc power distribution systems (see the preceding photograph). Another research effort has shown that low-level leakage faults and cable degradation can be detected by analyzing power system parameters over time. This additional fault detection capability will result in higher reliability for long-lived power systems such as reusable launch vehicles and space exploration missions.

Button, Robert M.

2004-01-01

118

Development status of the NSTAR ion propulsion system power processor  

NASA Astrophysics Data System (ADS)

A 0.5-2.3 kW xenon ion propulsion system is presently being developed under the NASA Solar Electric Propulsion Technology Application Readiness (NSTAR) program. This propulsion system includes a 30 cm diameter xenon ion thruster, a Digital Control Interface Unit, a xenon feed system, and a power processing unit (PPU). The PPU consists of the power supply assemblies which operate the thruster neutralizer, main discharge chamber, and ion optics. Also included are recycle logic and a digital microcontroller. The neutralizer and discharge power supplies employ a dual use configuration which combines the functions of two power supplies into one, significantly simplifying the PPU. Further simplification was realized by implementing a single thruster control loop which regulates the beam current via the discharge current. Continuous throttling is possible over a 0.5-2.3 kW output power range. All three power supplies have been fabricated and tested with resistive loads, and have been combined into a single breadboard unit with the recycle logic and microcontroller. All line and load regulation test results show the power supplies to be within the NSTAR flight PPU specified power output of 1.98 kW. The overall efficiency of the PPU, calculated as the combined efficiencies of the power supplies and controller, at 2.3 kW delivered to resistive loads was 0.90. The component was 6.16 kg. Integration testing of the neutralizer and discharge power supplies with a functional model thruster revealed no issues with discharge ignition or steady state operation.

Hamley, John A.; Pinero, Luis R.; Rawlin, Vincent K.; Miller, John R.; Cartier, Kevin C.; Bowers, Glen E.

1995-10-01

119

Development of the SCRF Power Coupler for the APT Accelerator  

SciTech Connect

The team responsible for the design of the Accelerator Production of Tritium (APT) superconducting (SC) radio frequency (RF) power coupler has developed two 700-MHz, helium gas-cooled power couplers. One has a fixed inner conductor and the other has an adjustable inner conductor (gamma prototype and alpha prototype). The power couplers will be performance tested in the near future. This paper discusses the mechanical design and fabrication techniques employed in the development of each power coupler. This includes material selection, copper coating, assembly sequences, and metal joining procedures, as well as the engineering analyses performed to determine the dynamic response of the inner conductors due to environmental excitations. A bellows is used in both prototype inner conductors in the area near the ceramic RF window, to compensate for thermal expansion and mechanical tolerance build-up. In addition, a bellows is used near the tip of the inner conductor of the alpha prototype for running the power coupler after it is installed on the accelerator. Extensive analytical work has been performed to determine the static loads transmitted by the bellows due to thermally induced expansion on the inner conductor and on the RF window. This paper also discusses this analysis, as well as the mechanical analysis performed to determine the final geometric shape of the bellows. Finally, a discussion of the electromagnetic analysis used to optimize the performance of the power couplers is included.

Schmierer, E.N.; Lujan, R.E.; Rusnak, B.; Smith, B.; Haynes, W.B.; Gautier, C.; Waynert, J.A.; Krawczyk, F.; Gioia, J.

1999-03-01

120

A Practical Approach to Starting Fission Surface Power Development  

NASA Technical Reports Server (NTRS)

The Prometheus Power and Propulsion Program has been reformulated to address NASA needs relative to lunar and Mars exploration. Emphasis has switched from the Jupiter Icy Moons Orbiter (JIMO) flight system development to more generalized technology development addressing Fission Surface Power (FSP) and Nuclear Thermal Propulsion (NTP). Current NASA budget priorities and the deferred mission need date for nuclear systems prohibit a fully funded reactor Flight Development Program. However, a modestly funded Advanced Technology Program can and should be conducted to reduce the risk and cost of future flight systems. A potential roadmap for FSP technology development leading to possible flight applications could include three elements: 1) Conceptual Design Studies, 2) Advanced Component Technology, and 3) Non-Nuclear System Testing. The Conceptual Design Studies would expand on recent NASA and DOE analyses while increasing the depth of study in areas of greatest uncertainty such as reactor integration and human-rated shielding. The Advanced Component Technology element would address the major technology risks through development and testing of reactor fuels, structural materials, primary loop components, shielding, power conversion, heat rejection, and power management and distribution (PMAD). The Non-Nuclear System Testing would provide a modular, technology testbed to investigate and resolve system integration issues.

Mason, Lee S.

2006-01-01

121

Progress in High Power Free-Piston Stirling Convertor Development  

NASA Technical Reports Server (NTRS)

The U.S. Space Exploration Policy has established a vision for human exploration of the moon and Mars. One option for power for future outposts on the lunar and Martian surfaces is a nuclear reactor coupled with a free-piston Stirling convertor at a power level of 30-40 kWe. A 25 kW convertor was developed in the 1990s under the SP-100 program. This system consisted of two 12.5 kWe engines connected at their hot ends and mounted in tandem to cancel vibration. Recently, NASA began a new project with Auburn University to develop a 5 kWe, single convertor for use in such a possible lunar power system. Goals of this development program include a specific power in excess of 140 We/kg at the convertor level, lifetime in excess of five years and a control system that will safely manage the convertors in case of an emergency. Foster-Miller, Inc. is developing the 5 kWe Stirling Convertor Assembly. The characteristics of the design along with progress in developing the system will be described.

Brandhorst, Henry W., Jr.; Kirby, Raymond L.; Chapman, Peter A.; Walter, Thomas J.

2008-01-01

122

The electric power system of the International Space Station-a platform for power technology development  

Microsoft Academic Search

The electrical power system developed for the International Space Station represents the largest space-based power system ever designed and, consequently, has driven some key technology aspects and operational challenges. The full U.S.-built system consists of a 160 V DC primary network, and a more tightly regulated 120 V DC secondary network. Additionally, the U.S. system interfaces with the 28 V

Eric B. Gietl; Edward W. Gholdston; Bruce A. Manners; Rex A. Delventhal

2000-01-01

123

Power and polarization monitor development for high power millimeter-wave  

SciTech Connect

A new type monitor of power and polarization states of millimeter-waves has been developed to be installed at a miter-bend, which is a part of transmission lines of millimeter-waves, for electron cyclotron resonance heating on the Large Helical Device. The monitor measures amplitudes and phase difference of the electric field of the two orthogonal polarizations which are needed for calculation of the power and polarization states of waves. The power and phase differences of two orthogonal polarizations were successfully detected simultaneously.

Makino, R., E-mail: makino.ryohhei@ms.nifs.ac.jp; Kobayashi, K. [Department of Energy Engineering and Science, Nagoya University, Nagoya 464-8603 (Japan); Kubo, S. [Department of Energy Engineering and Science, Nagoya University, Nagoya 464-8603 (Japan); National Institute for Fusion Science, Toki 509-5292 (Japan); Kobayashi, S.; Shimozuma, T.; Yoshimura, Y.; Igami, H.; Takahashi, H.; Mutoh, T. [National Institute for Fusion Science, Toki 509-5292 (Japan)

2014-11-15

124

Newly developed high-power laser diode bars  

NASA Astrophysics Data System (ADS)

High Power Laser Diode (LD) modules are widely used as high-brightness light sources for pumping solid-state lasers and for direct diode laser processing utilizing a compact feature. The LD bars installed in modules are required with higher output power, efficiency and beam quality. We have optimized the LD bar structure for high output power and efficient operation. The water-cooled heat sink has been designed for excellent thermal performance as well as long-term stable cooling performance. We have also developed the thermal expansion controlled assembly technique to suppress the "smile". As a result, we have achieved an output power of over 200 W and a conversion efficiency of 58% from 940 nm LD bars under continuous wave (CW) operation with very low smile of 0.8 ?m.

Kageyama, Nobuto; Morita, Takenori; Torii, Kousuke; Takauji, Motoki; Nagakura, Takehito; Maeda, Junya; Miyajima, Hirofumi; Yoshida, Harumasa

2012-03-01

125

Middle Eastern power systems; Present and future developments  

SciTech Connect

Middle Eastern Power systems have evolved independently of each other over many decades. The region covers a wide geographical area of over 4 million square kilometers with an estimated population in 1990 of over 120 million people. This paper discusses the present status and future power system developments in the Middle East with emphasis on the Mashrequ Arab Countries (MAC). MAC consists of Egypt, Iraq, Jordan, Lebanon, Syria, Yemen, and the six Gulf Cooperation Council (GCC) countries, namely, Bahrain, Kuwait, Qatar, Saudi Arabia, Oman, and the United Arab Emirates (UAE). Interconnections within MAC and possible extensions to Turkey, Europe, and Central Africa are discussed. A common characteristic of the MAC power systems is that they are all operated by government or semi-government bodies. The energy resources in the region are varied. Countries such as Iraq, Egypt, and Syria have significant hydro power resources. On the other hand, the GCC countries and Iraq have abundant fossil fuel reserves.

Not Available

1992-06-01

126

Development of lightweight radiators for lunar based power systems  

SciTech Connect

This report discusses application of a new lightweight carbon-carbon (C-C) space radiator technology developed under the NASA Civil-Space Technology Initiative (CSTI) High Capacity Power Program to a 20 kWe lunar based power system. This system comprises a nuclear (SP-100 derivative) heat source, a Closed Brayton Cycle (CBC) power conversion unit with heat rejection by means of a plane radiator. The new radiator concept is based on a C-C composite heat pipe with integrally woven fins and a thin walled metallic liner for containment of the working fluid. Using measured areal specific mass values (1.5 kg/m2) for flat plate radiators, comparative CBC power system mass and performance calculations show significant advantages if conventional heat pipes for space radiators are replaced by the new C-C heat pipe technology.

Juhasz, A.J.; Bloomfield, H.S.

1994-05-01

127

Development of Lightweight Radiators for Lunar Based Power Systems  

NASA Technical Reports Server (NTRS)

This report discusses application of a new lightweight carbon-carbon (C-C) space radiator technology developed under the NASA Civil-Space Technology Initiative (CSTI) High Capacity Power Program to a 20 kWe lunar based power system. This system comprises a nuclear (SP-100 derivative) heat source, a Closed Brayton Cycle (CBC) power conversion unit with heat rejection by means of a plane radiator. The new radiator concept is based on a C-C composite heat pipe with integrally woven fins and a thin walled metallic liner for containment of the working fluid. Using measured areal specific mass values (1.5 kg/m2) for flat plate radiators, comparative CBC power system mass and performance calculations show significant advantages if conventional heat pipes for space radiators are replaced by the new C-C heat pipe technology.

Juhasz, Albert J.; Bloomfield, Harvey S.

1994-01-01

128

Development of a dual-field heteropoplar power converter  

NASA Technical Reports Server (NTRS)

The design and testing of a 400 watt, dual phase, dual rotor, field modulated inductor alternator is described. The system is designed for use as a flywheel to ac utility line or flywheel to dc bus (electric vehicle) power converter. The machine is unique in that it uses dual rotors and separately controlled fields to produce output current and voltage which are in phase with each other. Having the voltage and current in phase allows the power electronics to be made of simple low cost components. Based on analytical predictions and experimental results, development of a complete 22 kilowatt (30 Hp) power conversion system is recommended. This system would include power electronics and controls and would replace the inductor alternator with an improved electromagnetic conversion system.

Eisenhaure, D. B.; Johnson, B.; Bliamptis, T.; St. George, E.

1981-01-01

129

Electrodeless lighting RF power source development. Final report  

SciTech Connect

An efficient, solid state RF power source has been developed on this NICE project for exciting low power electrodeless lamp bulbs. This project takes full advantage of concurrent advances in electrodeless lamp technology. Electrodeless lamp lighting systems utilizing the sulfur based bulb type developed by Fusion Lighting, Inc., is an emerging technology which is based on generating light in a confined plasma created and sustained by RF excitation. The bulb for such a lamp is filled with a particular element and inert gas at low pressure when cold. RF power from the RF source creates a plasma within the bulb which reaches temperatures approaching those of high pressure discharge lamp plasmas. At these temperatures the plasma radiates substantial visible light with a spectrum similar to sunlight.

NONE

1996-08-30

130

Power Systems Development Facility Gasification Test Campaing TC14  

SciTech Connect

In support of technology development to utilize coal for efficient, affordable, and environmentally clean power generation, the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama, routinely demonstrates gasification technologies using various types of coals. The PSDF is an engineering scale demonstration of key features of advanced coal-fired power systems, including a KBR Transport Gasifier, a hot gas particulate control device (PCD), advanced syngas cleanup systems, and high pressure solids handling systems. This report details test campaign TC14 of the PSDF gasification process. TC14 began on February 16, 2004, and lasted until February 28, 2004, accumulating 214 hours of operation using Powder River Basin (PRB) subbituminous coal. The gasifier operating temperatures varied from 1760 to 1810 F at pressures from 188 to 212 psig during steady air blown operations and approximately 160 psig during oxygen blown operations.

Southern Company Services

2004-02-28

131

European high-power CW gyrotron development for ECRH systems  

Microsoft Academic Search

The development of high power CW gyrotrons for ECRH heating of fusion relevant plasmas has been in progress for several years in a joint collaboration between different European research institutes and an industrial partner. Two development are on going, aiming, respectively, towards a 0.51-MW–210-s gyrotron at 118 GHz for the tokamaks TCV of CRPP (2 s pulse length) and Tore

S Albertia; A Arnold; E Borie; G Dammertz; V Erckmann; P Garin; E Giguet; S Illy; G Le Cloarec; Y Le Goff; R Magne; G Michel; B Piosczyk; C Tran; M. Q Tran; M Thumm; D Wagner

2001-01-01

132

System Planning for Bay of Fundy Tidal Power Developments  

Microsoft Academic Search

This paper focuses attention on the markets that could be served by potential tidal projects in the Bay of Fundy, describes the system considerations and computer models used to analyze the technical and economic viability of such developments and outlines the transmission requirements necessary for their integration into the power system networks. It also details the results of a study

A. N. Karas

1978-01-01

133

Development of a solar-powered passive ejector cooling system  

Microsoft Academic Search

This paper describes the development of an ejector refrigeration system that is powered by solar thermal energy. The cooling system contains no active parts and is therefore deemed passive. Water is used as the refrigerant though other natural refrigerants could be used for lower temperature operation. A prototype system was built with a nominal cooling capacity of 7 kW. This

V. M Nguyen; S. B Riffat; P. S Doherty

2001-01-01

134

The Mighty Atom? The Development of Nuclear Power Technology  

ERIC Educational Resources Information Center

The use of nuclear energy for the generation of electricity started in the 1950s and was viewed, at the time, as a source of virtually free power. Development flourished and some countries adopted the nuclear option as their principal source for producing electrical energy. However, a series of nuclear incidents and concern about the treatment of…

Harris, Frank

2014-01-01

135

Duke Power Company's development of a biofouling monitoring program  

Microsoft Academic Search

Biofouling programs at Duke Power Company (DPC) can be traced to the invasion of the Catawba River system by Corbicula in 1968. Raw water systems at Plant Allen, a coal-fired station on Lake Wylie, became heavily infested by clams during the 1970s. Development of programs was accelerated as a result of the shutdown of Catawba nuclear station (CNS) on lake

J. E. Derwort; A. Gnilka

1991-01-01

136

Developing robotics for nondestructive testing in nuclear power plants  

Microsoft Academic Search

The ability to perform remote nondestructive testing in high radiation areas is becoming increasingly attractive as a means of minimizing radiation exposure to personnel. Robots could be used in nuclear power plants where NDT technicians are currently exposed to high levels of radiation. In developing robotics technology for this purpose, several key factors must be considered: (1) End-of-arm tooling for

Scheer

1984-01-01

137

Research, Development, Demonstration and Deployment Issues in the Power Sector  

EPA Science Inventory

For Frank Princiotta?s book, Global Climate Change?The Technology Challenge In this chapter we explore the challenges in developing and deploying technology for mitigation of CO2 emissions associated with power generation. Past successes with controlling other pollutants (notab...

138

Power conditioning unit development for MAG-TRANSIT  

Microsoft Academic Search

The results of a development program which has been completed on a modular inverter, referred to as the Power Conditioning Unit (PCU), employing many parallel TO-3 transistors, are discussed. The PCU has been designed to provide a precisely controlled, variable voltage, variable frequency excitation to a linear induction motor in the MAG-TRANSIT system, a form of magnetically levitated vehicles for

R. G. Gilliland; R. J. Smith

1981-01-01

139

The Hazards Posed by the Global Development of Nuclear Power  

ERIC Educational Resources Information Center

Outlines the growth in the demand for energy on a world-wide basis. Reviews the development of nuclear power and points out the many hazards in the nuclear fuel cycle. Describes the nature of nuclear wastes and explains the quantities involved and the current techniques for waste disposal. (GS)

O'Reilly, S. A.

1976-01-01

140

Development of long life lithium ion battery for power storage  

Microsoft Academic Search

With the aim of developing lithium ion batteries with a long life and high efficiency for power storage, we experimentally evaluated combinations of cathode and anode active materials, in which batteries are able to obtain over 4000 cycles or 10 years of life. An acceleration method was evaluated using coin cells. We found that changing the current density was effective

Masatoshi Majima; Satoshi Ujiie; Eriko Yagasaki; Keiji Koyama; Shinji Inazawa

2001-01-01

141

Power and Perspective: The Discourse of Professional Development School Literature  

ERIC Educational Resources Information Center

This paper reports on the results of a study in which the discourse within 75 professional development school (PDS)-related publications was examined to determine where the power, influence, and representation lies in PDS partnerships, as indicated by how those partnerships are described in writing. The results found that while university faculty…

Breault, Rick

2014-01-01

142

Status of Brayton cycle power conversion development at NASA GRC  

NASA Astrophysics Data System (ADS)

The NASA Glenn Research Center is pursuing the development of Brayton cycle power conversion for various NASA initiatives. Brayton cycle power systems offer numerous advantages for space power generation including high efficiency, long life, high maturity, and broad salability. Candidate mission applications include surface rovers and bases, advanced propulsion vehicles, and earth orbiting satellites. A key advantage is the ability for Brayton converters to span the wide range of power demands of future missions from several kilowatts to multi-megawatts using either solar, isotope, or reactor heat sources. Brayton technology has been under development by NASA since the early 1960's resulting in engine prototypes in the 2 to 15 kW-class that have demonstrated conversion efficiency of almost 30% and cumulative operation in excess of 40,000 hours. Present efforts at GRC are focusing on a 2 kW testbed as a proving ground for future component advances and operational strategies, and a 25 kW engine design as a modular building block for 100 kW-class electric propulsion and Mars surface power applications. .

Mason, Lee S.; Shaltens, Richard K.; Dolce, James L.; Cataldo, Robert L.

2002-01-01

143

Development and advances in conventional high power RF systems  

SciTech Connect

The development of rf systems capable of producing high peak power (hundreds of megawatts) at relatively short pulse lengths (0.1--5 microseconds) is currently being driven mainly by the requirements of future high energy linear colliders, although there may be applications to industrial, medical and research linacs as well. The production of high peak power rf typically involves four basic elements: a power supply to convert ac from the ``wall plug`` to dc; a modulator, or some sort of switching element, to produce pulsed dc power; an rf source to convert the pulsed dc to pulsed rf power; and possibly an rf pulse compression system to further enhance the peak rf power. Each element in this rf chain from wall plug to accelerating structure must perform with high efficiency in a linear collider application, such that the overall system efficiency is 30% or more. Basic design concepts are discussed for klystrons, modulators and rf pulse compression systems, and their present design status is summarized for applications to proposed linear colliders.

Wilson, P.B.

1995-06-01

144

Development of the cost-effective IGCC power plant  

SciTech Connect

Utilization of the world's vast coal reserves for environmentally benign power generation in plants with the highest possible efficiencies is and will remain a top priority. This made it necessary to develop the integrated gasification combined cycle (IGCC). While the IGCC prototype plants, three in the US and two in Europe, have the task of proving what is technically achievable, advanced IGCC technology is currently being developed further to provide the basis for clean and affordable energy in a competitive market. However, efficiency is only one aspect here. In addition to reliability and availability, power generating costs are the key criterion for a power producer, which logically means that these are lower than those of today's most advanced pulverized-coal-fired (PCF) steam power plants at the same specific capital investment due to the benefit from the achieved clearly higher efficiencies. This contribution reports interim results of a comprehensive ongoing study funded by the European Commission. First, the status of the IGCC 98 technology is described. Net station efficiencies around 52% are achieved under the site conditions prevailing in Denmark, where one of the world's most modern PCF power plants (design efficiency 47%) is currently being commissioned. The IGCC 98 station will be equipped with PRENFLO gasification developed by Krupp and a Siemens Model V94.3A gas turbine-generator with 1,250 C turbine inlet temperature (ISO). Furthermore, the results of a detailed cost estimate based on Western European conditions and aimed at clearly lower specific capital investment for an IGCC power plant are depicted.

Baumann, H.R.; Ullrich, N.; Haupt, G.; Zimmermann, G.; Pruschek, R.; Oeljeklaus, G.

1998-07-01

145

Development of large wind energy power generation system  

NASA Technical Reports Server (NTRS)

The background and development of an experimental 100 kW wind-energy generation system are described, and the results of current field tests are presented. The experimental wind turbine is a two-bladed down-wind horizontal axis propeller type with a 29.4 m diameter rotor and a tower 28 m in height. The plant was completed in March, 1983, and has been undergoing trouble-free tests since then. The present program calls for field tests during two years from fiscal 1983 to 1984. The development of technologies relating to the linkage and operation of wind-energy power generation system networks is planned along with the acquisition of basic data for the development of a large-scale wind energy power generation system.

1985-01-01

146

Solar dynamic power system development for Space Station Freedom  

NASA Technical Reports Server (NTRS)

The development of a solar dynamic electric power generation system as part of the Space Station Freedom Program is documented. The solar dynamic power system includes a solar concentrator, which collects sunlight; a receiver, which accepts and stores the concentrated solar energy and transfers this energy to a gas; a Brayton turbine, alternator, and compressor unit, which generates electric power; and a radiator, which rejects waste heat. Solar dynamic systems have greater efficiency and lower maintenance costs than photovoltaic systems and are being considered for future growth of Space Station Freedom. Solar dynamic development managed by the NASA Lewis Research Center from 1986 to Feb. 1991 is covered. It summarizes technology and hardware development, describes 'lessons learned', and, through an extensive bibliography, serves as a source list of documents that provide details of the design and analytic results achieved. It was prepared by the staff of the Solar Dynamic Power System Branch at the NASA Lewis Research Center in Cleveland, Ohio. The report includes results from the prime contractor as well as from in-house efforts, university grants, and other contracts. Also included are the writers' opinions on the best way to proceed technically and programmatically with solar dynamic efforts in the future, on the basis of their experiences in this program.

1993-01-01

147

Solar dynamic power system development for Space Station Freedom  

NASA Astrophysics Data System (ADS)

The development of a solar dynamic electric power generation system as part of the Space Station Freedom Program is documented. The solar dynamic power system includes a solar concentrator, which collects sunlight; a receiver, which accepts and stores the concentrated solar energy and transfers this energy to a gas; a Brayton turbine, alternator, and compressor unit, which generates electric power; and a radiator, which rejects waste heat. Solar dynamic systems have greater efficiency and lower maintenance costs than photovoltaic systems and are being considered for future growth of Space Station Freedom. Solar dynamic development managed by the NASA Lewis Research Center from 1986 to Feb. 1991 is covered. It summarizes technology and hardware development, describes 'lessons learned', and, through an extensive bibliography, serves as a source list of documents that provide details of the design and analytic results achieved. It was prepared by the staff of the Solar Dynamic Power System Branch at the NASA Lewis Research Center in Cleveland, Ohio. The report includes results from the prime contractor as well as from in-house efforts, university grants, and other contracts. Also included are the writers' opinions on the best way to proceed technically and programmatically with solar dynamic efforts in the future, on the basis of their experiences in this program.

1993-07-01

148

Modelling Sustainable Development Scenarios of Croatian Power System  

NASA Astrophysics Data System (ADS)

The main objective of power system sustainable development is to provide the security of electricity supply required to underpin economic growth and increase the quality of living while minimizing adverse environmental impacts. New challenges such as deregulation, liberalization of energy markets, increased competition on energy markets, growing demands on security of supply, price insecurities and demand to cut CO2 emissions, are calling for better understanding of electrical systems modelling. Existing models are not sufficient anymore and planners will need to think differently in order to face these challenges. Such a model, on the basis on performed simulations, should enable planner to distinguish between different options and to analyze sustainability of these options. PLEXOS is an electricity market simulation model, used for modeling electrical system in Croatia since 2005. Within this paper, generation expansion scenarios until 2020 developed for Croatian Energy Strategy and modeled in PLEXOS. Development of sustainable Croatian energy scenario was analyzed in the paper - impacts of CO2 emission price and wind generation. Energy Strategy sets goal for 1200 MW from wind power plants in 2020. In order to fully understand its impacts, intermittent nature of electricity generation from wind power plant was modeled. We conclude that electrical system modelling using everyday growing models has proved to be inevitable for sustainable electrical system planning in complex environment in which power plants operate today.

Paši?ko, Robert; Stani?, Zoran; Debrecin, Nenad

2010-05-01

149

Solar Power Satellite Development: Advances in Modularity and Mechanical Systems  

NASA Technical Reports Server (NTRS)

Space solar power satellites require innovative concepts in order to achieve economically and technically feasible designs. The mass and volume constraints of current and planned launch vehicles necessitate highly efficient structural systems be developed. In addition, modularity and in-space deployment will be enabling design attributes. This paper reviews the current challenges of launching and building very large space systems. A building block approach is proposed in order to achieve near-term solar power satellite risk reduction while promoting the necessary long-term technology advances. Promising mechanical systems technologies anticipated in the coming decades including modularity, material systems, structural concepts, and in-space operations are described

Belvin, W. Keith; Dorsey, John T.; Watson, Judith J.

2010-01-01

150

High-power ultrasonic processing: Recent developments and prospective advances  

NASA Astrophysics Data System (ADS)

Although the application of ultrasonic energy to produce or to enhance a wide variety of processes have been explored since about the middle of the 20th century, only a reduced number of ultrasonic processes have been established at industrial level. However, during the last ten years the interest in ultrasonic processing has revived particularly in industrial sectors where the ultrasonic technology may represent a clean and efficient tool to improve classical existing processes or an innovation alternative for the development of new processes. Such seems to be the case of relevant sectors such as food industry, environment, pharmaceuticals and chemicals manufacture, machinery, mining, etc where power ultrasound is becoming an emerging technology for process development. The possible major problem in the application of high-intensity ultrasound on industrial processing is the design and development of efficient power ultrasonic systems (generators and reactors) capable of large scale successful operation specifically adapted to each individual process. In the area of ultrasonic processing in fluid media and more specifically in gases, the development of the steppedplate transducers and other power ge with extensive radiating surface has strongly contributed to the implementation at semi-industrial and industrial stage of several commercial applications, in sectors such as food and beverage industry (defoaming, drying, extraction, etc), environment (air cleaning, sludge filtration, etc...), machinery and process for manufacturing (textile washing, paint manufacture, etc). The development of different cavitational reactors for liquid treatment in continuous flow is helping to introduce into industry the wide potential of the area of sonochemistry. Processes such as water and effluent treatment, crystallization, soil remediation, etc have been already implemented at semi-industrial and/or industrial stage. Other single advances in sectors like mining or energy have also to be mentioned. The objective of this paper is to review some recent developments in ultrasonic processing to show the present situation and the prospective progresses of high-power ultrasonics as an innovative technology in many industrial sectors.

Gallego-Juarez, Juan A.

2010-01-01

151

Designs and applications for floating-hydro power systems in small streams  

SciTech Connect

The project focuses on an appropriate technology for small-scale hydro power: floating waterwheels and turbines. For background, relic and existing systems such as early floating mills, traditional Amish waterwheels, and micro-hydro systems are examined. In the design phase of the project, new designs for Floating Hydro Power Systems include: an analysis of floatation materials and systems; a floating undershot waterwheel design; a floating cylinder (fiberglass storage tank) design; a submerged tube design; and a design for a floating platform with submerged propellers. Finally, in the applications phase, stream flow data from East Tennessee streams are used in a discussion of the potential applications of floating hydro power systems in small streams.

Rehder, J.B.

1983-01-01

152

Development of compact rapid charging power supply for capacitive energy storage in pulsed power drivers.  

PubMed

High energy capacitor bank is used for primary electrical energy storage in pulsed power drivers. The capacitors used in these pulsed power drivers have low inductance, low internal resistance, and less dc life, so it has to be charged rapidly and immediately discharged into the load. A series resonant converter based 45 kV compact power supply is designed and developed for rapid charging of the capacitor bank with constant charging current up to 150 mA. It is short circuit proof, and zero current switching technique is used to commute the semiconductor switch. A high frequency resonant inverter switching at 10 kHz makes the overall size small and reduces the switching losses. The output current of the power supply is limited by constant on-time and variable frequency switching control technique. The power supply is tested by charging the 45 kV/1.67 ?F and 15 kV/356 ?F capacitor banks. It has charged the capacitor bank up to rated voltage with maximum charging current of 150 mA and the average charging rate of 3.4 kJ/s. The output current of the power supply is limited by reducing the switching frequency at 5 kHz, 3.3 kHz, and 1.7 kHz and tested with 45 kV/1.67 ?F capacitor bank. The protection circuit is included in the power supply for over current, under voltage, and over temperature. The design details and the experimental testing results of the power supply for resonant current, output current, and voltage traces of the power supply with capacitive, resistive, and short circuited load are presented and discussed. PMID:25725838

Sharma, Surender Kumar; Shyam, Anurag

2015-02-01

153

Development of compact rapid charging power supply for capacitive energy storage in pulsed power drivers  

NASA Astrophysics Data System (ADS)

High energy capacitor bank is used for primary electrical energy storage in pulsed power drivers. The capacitors used in these pulsed power drivers have low inductance, low internal resistance, and less dc life, so it has to be charged rapidly and immediately discharged into the load. A series resonant converter based 45 kV compact power supply is designed and developed for rapid charging of the capacitor bank with constant charging current up to 150 mA. It is short circuit proof, and zero current switching technique is used to commute the semiconductor switch. A high frequency resonant inverter switching at 10 kHz makes the overall size small and reduces the switching losses. The output current of the power supply is limited by constant on-time and variable frequency switching control technique. The power supply is tested by charging the 45 kV/1.67 ?F and 15 kV/356 ?F capacitor banks. It has charged the capacitor bank up to rated voltage with maximum charging current of 150 mA and the average charging rate of 3.4 kJ/s. The output current of the power supply is limited by reducing the switching frequency at 5 kHz, 3.3 kHz, and 1.7 kHz and tested with 45 kV/1.67 ?F capacitor bank. The protection circuit is included in the power supply for over current, under voltage, and over temperature. The design details and the experimental testing results of the power supply for resonant current, output current, and voltage traces of the power supply with capacitive, resistive, and short circuited load are presented and discussed.

Sharma, Surender Kumar; Shyam, Anurag

2015-02-01

154

Development of a high power three-loop nuclear power plant  

Microsoft Academic Search

A conceptual design for a new three-loop nuclear power reactor at 1700MWe, P3-1700, is developed. P3 stands for a new design philosophy, which requires protection, performance, and pro-activeness in the design. The design is developed from the proven technology of APR1400, while a significant improvement in the safety and performance is pursued by adopting a new fuel assembly design, a

J. H. Song; J. H. Baik; S. K. Zee; S. Y. Park; S. Choi; B. D. Chung; W. P. Baek

2010-01-01

155

Heatpipe power system and heatpipe bimodal system development status  

SciTech Connect

The Heatpipe Power System (HPS) is a potential, near-term, low-cost space fission power system. The Heatpipe Bimodal System (HBS) is a potential, near-term, low-cost space fission power and/or propulsion system. Both systems will be composed of independent modules, and all components use existing technology and operate within the existing database. The HPS and HBS have relatively few system integration issues; thus, the successful development of a module is a significant step toward verifying system feasibility and performance estimates. A prototypic HPS module was fabricated, and initial testing was completed in April 1997. All test objectives were accomplished, demonstrating the basic feasibility of the HPS. Fabrication of an HBS module is underway, and testing should begin in early 1998. {copyright} {ital 1998 American Institute of Physics.}

Houts, M.G.; Poston, D.I. [Los Alamos National Laboratory, MS K551, Los Alamos, New Mexico 87545 (United States); Emrich, W.J. Jr. [NASA Marshall Spaceflight Center, PS05, Huntsville, Alabama 35758 (United States)

1998-01-01

156

Heatpipe power system and heatpipe bimodal system development status  

SciTech Connect

The Heatpipe Power System (HPS) is a potential, near-term, low-cost space fission power system. The Heatpipe Bimodal System (HBS) is a potential, near-term, low-cost space fission power and/or propulsion system. Both systems will be composed of independent modules, and all components use existing technology and operate within the existing database. The HPS and HBS have relatively few system integration issues; thus, the successful development of a module is a significant step toward verifying system feasibility and performance estimates. A prototypic HPS module was fabricated, and initial testing was completed in April 1997. All test objectives were accomplished, demonstrating the basic feasibility of the HPS. Fabrication of an HBS module is underway, and testing should begin in early 1998.

Houts, Michael G.; Poston, David I.; Emrich, William J. Jr. [Los Alamos National Laboratory, MS K551, Los Alamos, New Mexico 87545 (United States); NASA Marshall Spaceflight Center, PS05, Huntsville, Alabama 35758 (United States)

1998-01-15

157

Further developments in LP-based optimal power flow  

SciTech Connect

Over the past twenty five years, the optimal power flow (OPF) approach that has received the most widespread practical application is the one based on linear programming (LP). Special customized LP methods have been utilized primarily for fast reliable security-constrained dispatch using decoupled separable OPF problem formulations. They have been used in power system planning, operations and control. Nevertheless, while the LP approach has a number of important attributes, its range of application in the OPF field has remained somewhat restricted. This paper describes further developments that have transformed the LP approach into a truly general-purpose OPF solver, with computational and other advantages over even recent nonlinear programming (NLP) methods. The nonseparable loss-minimization problem can now be solved, giving the same results as NLP on power systems of any size and type.

Alsac, O.; Bright, J.; Prais, M.; Stott, B.P (Power Computer Applications Corp., Mesa, AZ (US))

1990-08-01

158

Development of high-power holmium-doped fibre amplifiers  

NASA Astrophysics Data System (ADS)

Resonantly pumped holmium fibre lasers present a range of opportunities for the development of novel fibre laser and amplifier devices due to the availability of mature, efficient high power thulium fibre pump lasers. In this paper we describe the operation of a large mode area holmium-doped fibre amplifier. The master-oscillator is an all-fibre linearly polarised, core pumped single mode laser operating at 27 W at 2.11 ?m. This laser was amplified in a large mode area fibre producing up to 265 W of output power. This system is the first demonstration of a resonantly pumped holmiumdoped fibre amplifier. It is also the highest power fibre amplifier that is capable of operating in an atmospheric transmission window <2.05 ?m. This monolithic all-fibre system is able to address a wide range of remote sensing, scientific, medical and defence applications.

Hemming, Alexander; Simakov, Nikita; Davidson, Alan; Oermann, Michael; Corena, Len; Stepanov, Dmitrii; Carmody, Neil; Haub, John; Swain, Robert; Carter, Adrian

2014-03-01

159

78 FR 47012 - Developing Software Life Cycle Processes Used in Safety Systems of Nuclear Power Plants  

Federal Register 2010, 2011, 2012, 2013, 2014

...systems in nuclear power plants. ADDRESSES: Please...This series was developed to describe and...systems of nuclear power plants. These RGs were developed by the Office of...Systems of Nuclear Power Plants,'' issued...

2013-08-02

160

White LEDs for lighting remote communities in developing countries  

NASA Astrophysics Data System (ADS)

Over the past 5 years, the application of white LEDs for ambient lighting has been investigated in the remote villages of Nepal. Currently, lighting is often met using kerosene wick lamps, which emit unhealthy levels of fumes, or by burning sap-filled pine sticks, which are worse than the kerosene lamps. A team of students from Calgary University developed some LED lamps that could easily be fabricated in Nepal using local materials and personnel. To generate power, a pedal DC generator was developed to charge batteries, as well as a simple wind turbine. The Nepal Light Project implemented a series of many projects over the last 2 years in several villages across Nepal, using several different power generating systems. A total of 142 households, two schools and a temple were fitted with lamps in 2000, and more will follow in 2001. A research project has also been undertaken in Nepal for the Danish International Development Agency (DANIDA) to investigate the potential for energy efficient lamps in the micro hydro industry. The R&D project was very small, and conducted basic testing on locally available compact fluorescent lamps and LED lamps. The report concluded that encouraging the use of CFLs would decrease costs by 30-50%, and that they should be included in the subsidy policy, along with power factor correcting capacitors. LED lamps should not be overly encouraged as the development of the diodes was advancing very rapidly. The real advantage of LED lamps lies in extremely low maintenance costs due to the low power requirements and long life, which is just as important for remote villages as it is for traffic lights and exit signs. It is estimated that these low ongoing costs could be as low as $3/household/year for a rural lighting project. Pilot projects should be encouraged to demonstrate and investigate the potential of WLEDs for lighting in remote communities in developing countries. With 2 billion people without access to electricity, and lighting being the first end use people generally require, the potential for white LEDs is nothing short of staggering, but they will face challenges similar to CFL technology due to the high initial cost of the lamps.

Craine, Stewart; Irvine-Halliday, Dave

2001-12-01

161

Power Electronics Development for the SPT-100 Thruster  

NASA Technical Reports Server (NTRS)

Russian electric propulsion technologies have recently become available on the world market. Of significant interest is the Stationary Plasma Thruster (SPT) which has a significant flight heritage in the former Soviet space program. The SPT has performance levels of up to 1600 seconds of specific impulse at a thrust efficiency of 0.50. Studies have shown that this level of performance is well suited for stationkeeping applications, and the SPT-100, with a 1.35 kW input power level, is presently being evaluated for use on Western commercial satellites. Under a program sponsored by the Innovative Science and Technology Division of the Ballistic Missile Defense Organization, a team of U.S. electric propulsion specialists observed the operation of the SPT-100 in Russia. Under this same program, power electronics were developed to operate the SPT-100 to characterize thruster performance and operation in the U.S. The power electronics consisted of a discharge, cathode heater, and pulse igniter power supplies to operate the thruster with manual flow control. A Russian designed matching network was incorporated in the discharge supply to ensure proper operation with the thruster. The cathode heater power supply and igniter were derived from ongoing development projects. No attempts were made to augment thruster electromagnet current in this effort. The power electronics successfully started and operated the SPT-100 thruster in performance tests at NASA Lewis, with minimal oscillations in the discharge current. The efficiency of the main discharge supply was measured at 0.92, and straightforward modifications were identified which could increase the efficiency to 0.94.

Hamley, John A.; Hill, Gerald M.; Sankovic, John M.

1994-01-01

162

Power electronics development for the SPT-100 thruster  

NASA Astrophysics Data System (ADS)

Russian electric propulsion technologies have recently become available on the world market. Of significant interest is the Stationary Plasma Thruster (SPT) which has a significant flight heritage in the former Soviet space program. The SPT has performance levels of up to 1600 seconds of specific impulse at a thrust efficiency of 0.50. Studies have shown that this level of performance is well suited for stationkeeping applications, and the SPT-100, with a 1.35 kW input power level, is presently being evaluated for use on Western commercial satellites. Under a program sponsored by the Innovative Science and Technology Division of the Ballistic Missile Defense Organization, a team of U.S. electric propulsion specialists observed the operation of the SPT-100 in Russia. Under this same program, power electronics were developed to operate the SPT-100 to characterize thruster performance and operation in the U.S. The power electronics consisted of a discharge, cathode heater, and pulse igniter power supplies to operate the thruster with manual flow control. A Russian designed matching network was incorporated in the discharge supply to ensure proper operation with the thruster. The cathode heater power supply and igniter were derived from ongoing development projects. No attempts were made to augment thruster electromagnet current in this effort. The power electronics successfully started and operated the SPT-100 thruster in performance tests at NASA Lewis, with minimal oscillations in the discharge current. The efficiency of the main discharge supply was measured at 0.92, and straightforward modifications were identified which could increase the efficiency to 0.94.

Hamley, John A.; Hill, Gerald M.; Sankovic, John M.

1994-02-01

163

Technology Development for a Stirling Radioisotope Power System  

NASA Technical Reports Server (NTRS)

NASA Glenn Research Center and the Department of Energy are developing a Stirling convertor for an advanced radioisotope power system to provide spacecraft on-board electric power for NASA deep space missions. NASA Glenn is addressing key technology issues through the use of two NASA Phase II SBIRs with Stirling Technology Company (STC) of Kennewick, WA. Under the first SBIR, STC demonstrated a synchronous connection of two thermodynamically independent free-piston Stirling convertors and a 40 to 50 fold reduction in vibrations compared to an unbalanced convertor. The second SBIR is for the development of an Adaptive Vibration Reduction System (AVRS) that will essentially eliminate vibrations over the mission lifetime, even in the unlikely event of a failed convertor. This paper presents the status and results for these two SBIR projects and also discusses a new NASA Glenn in-house project to provide supporting technology for the overall Stirling radioisotope power system development. Tasks for this new effort include convertor performance verification, controls development, heater head structural life assessment, magnet characterization and thermal aging tests, FEA analysis for a lightweight alternator concept, and demonstration of convertor operation under launch and orbit transfer load conditions.

Thieme, Lanny G.; Qiu, Songgang; White, Maurice A.

2000-01-01

164

High-Power Krypton Hall Thruster Technology Being Developed for Nuclear-Powered Applications  

NASA Technical Reports Server (NTRS)

The NASA Glenn Research Center has been performing research and development of moderate specific impulse, xenon-fueled, high-power Hall thrusters for potential solar electric propulsion applications. These applications include Mars missions, reusable tugs for low-Earth-orbit to geosynchronous-Earth-orbit transportation, and missions that require transportation to libration points. This research and development effort resulted in the design and fabrication of the NASA-457M Hall thruster that has been tested at input powers up to 95 kW. During project year 2003, NASA established Project Prometheus to develop technology in the areas of nuclear power and propulsion, which are enabling for deep-space science missions. One of the Project-Prometheus-sponsored Nuclear Propulsion Research tasks is to investigate alternate propellants for high-power Hall thruster electric propulsion. The motivation for alternate propellants includes the disadvantageous cost and availability of xenon propellant for extremely large scale, xenon-fueled propulsion systems and the potential system performance benefits of using alternate propellants. The alternate propellant krypton was investigated because of its low cost relative to xenon. Krypton propellant also has potential performance benefits for deep-space missions because the theoretical specific impulse for a given voltage is 20 percent higher than for xenon because of krypton's lower molecular weight. During project year 2003, the performance of the high-power NASA-457M Hall thruster was measured using krypton as the propellant at power levels ranging from 6.4 to 72.5 kW. The thrust produced ranged from 0.3 to 2.5 N at a discharge specific impulse up to 4500 sec.

Jacobson, David T.; Manzella, David H.

2004-01-01

165

Development and fabrication of improved Schottky power diodes  

NASA Technical Reports Server (NTRS)

Reproducible methods for the fabrication of silicon Schottky diodes have been developed for tungsten, aluminum, conventional platinum silicide, and low temperature platinum silicide. Barrier heights and barrier lowering under reverse bias have been measured, permitting the accurate prediction of forward and reverse diode characteristics. Processing procedures have been developed that permit the fabrication of large area (about 1 sq cm) mesageometry power Schottky diodes with forward and reverse characteristics that approach theoretical values. A theoretical analysis of the operation of bridge rectifier circuits has been performed, which indicates the ranges of frequency and voltage for which Schottky rectifiers are preferred to p-n junctions. Power Schottky rectifiers have been fabricated and tested for voltage ratings up to 140 volts.

Cordes, L. F.; Garfinkel, M.; Taft, E. A.

1975-01-01

166

Developing Countries & Global Climate Change: Electric Power Options in Korea  

NSDL National Science Digital Library

The Pew Center on Global Climate Change has recently placed online the October 1999 report entitled "Developing Countries & Global Climate Change: Electric Power Options in Korea." Written by Jin-Gyu Oh and others, the report (.pdf format) discusses the implications of Korea's energy choices -- coal, gas, nuclear, or renewable energy -- and how the chosen "mix of policy, growth, and technology will affect investment costs and the local and global environment."

Chandler, William.

1999-01-01

167

On the Development of Low Power MAC Protocol for WBANs  

Microsoft Academic Search

Current advances in wireless communication, microelectronics, semiconductor\\u000atechnologies, and intelligent sensors have contributed to the development of\\u000aunobtrusive WBANs. These networks provide long term health monitoring of\\u000apatients without any constraint in their normal activities. Traditional MAC\\u000aprotocols do not accommodate the assorted WBAN traffic requirements in a power\\u000aefficient manner. In this paper, we present a brief discussion on

Sana Ullah; Pervez Khan; Kyung Sup Kwak

2009-01-01

168

Power Systems Development Facility Gasification Test Campaign TC20  

SciTech Connect

In support of technology development to utilize coal for efficient, affordable, and environmentally clean power generation, the Power Systems Development Facility (PSDF), located in Wilsonville, Alabama, routinely demonstrates gasification technologies using various types of coal. The PSDF is an engineering scale demonstration of key features of advanced coal-fired power systems, including a Transport Gasifier, a hot gas particulate control device (PCD), advanced syngas cleanup systems, and high-pressure solids handling systems. This report summarizes the results of the first demonstration of the Transport Gasifier following significant modifications of the gasifier configuration. This demonstration took place during test campaign TC20, occurring from August 8 to September 23, 2006. The modifications proved successful in increasing gasifier residence time and particulate collection efficiency, two parameters critical in broadening of the fuel operating envelope and advancing gasification technology. The gasification process operated for over 870 hours, providing the opportunity for additional testing of various gasification technologies, such as PCD failsafe evaluation and sensor development.

Southern Company Services

2006-09-30

169

Approach to develop space solar power as a new energy system for developing countries  

SciTech Connect

The idea of space solar power proposed by Glaser was explained as a set of a solar power station in geostationary earth orbit to transmit microwave power and a ground station to receive the microwave power. Most of the ideas and concepts since Glaser used the same context. On the other hand, Collins et al. introduced the concept of microwave `fuel` to assess the commercial relations of power from space, in which space solar power stations are considered to sell microwave power to any unspecified rectenna. This concept changed the theoretical context of `power from space` to an industrial and economic relation of producers and buyers of an industrial product. This new context has been applied to the SPS 2000 conceptual study. As a result, if 2.45 GHz microwave power transmission is used, each rectenna can be planned and engineered independently from the space sector by local users, especially in developing countries, who are familiar with such activities as introducing solar energy systems. 7 refs., 3 figs.

Nagatomo, Makoto [Inst. of Space and Astronautical Science, Sagamihara (Japan)] [Inst. of Space and Astronautical Science, Sagamihara (Japan)

1996-12-31

170

Development of 3 kW at 325 MHz solid-state RF power amplifier using four power amplifier modules  

NASA Astrophysics Data System (ADS)

A high power solid-state RF power amplifier of 3 kW at 325 MHz has been developed using only four RF power amplifier modules of 850 W power output each. The design and characterization of RF power modules have been presented. A four way Wilkinson power combiner adds the output of four power amplifier modules with a total transmission loss of less than 6%. The combined power amplifier has a power gain of 20.2 dB at 1-dB compression point, and the corresponding output power is 2.8 kW at 325 MHz. The drain efficiency of the power amplifier is 65.3% at 3 kW. All the harmonics of this amplifier are below -40 dBc. The amplifier has better characteristics like fewer numbers of active devices per kilo watt, high efficiency, high gain, and ruggedness etc for RF accelerator applications.

Ramarao, B. V.; Sonal, S.; Mishra, J. K.; Pande, M.; Singh, P.; Kumar, G.; Mukherjee, J.

2014-01-01

171

Power Systems Development Facility Gasification Test Campaing TC18  

SciTech Connect

In support of technology development to utilize coal for efficient, affordable, and environmentally clean power generation, the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama, routinely demonstrates gasification technologies using various types of coals. The PSDF is an engineering scale demonstration of key features of advanced coal-fired power systems, including a KBR Transport Gasifier, a hot gas particulate control device (PCD), advanced syngas cleanup systems, and high pressure solids handling systems. This report details Test Campaign TC18 of the PSDF gasification process. Test campaign TC18 began on June 23, 2005, and ended on August 22, 2005, with the gasifier train accumulating 1,342 hours of operation using Powder River Basin (PRB) subbituminous coal. Some of the testing conducted included commissioning of a new recycle syngas compressor for gasifier aeration, evaluation of PCD filter elements and failsafes, testing of gas cleanup technologies, and further evaluation of solids handling equipment. At the conclusion of TC18, the PSDF gasification process had been operated for more than 7,750 hours.

Southern Company Services

2005-08-31

172

Power Systems Development Facility Gasification Test Campaign TC21  

SciTech Connect

In support of technology development to utilize coal for efficient, affordable, and environmentally clean power generation, the Power Systems Development Facility (PSDF), located in Wilsonville, Alabama, routinely demonstrates gasification technologies using various types of coal. The PSDF is an engineering scale demonstration of key features of advanced coal-fired power systems, including a Transport Gasifier, a hot gas particulate control device (PCD), advanced syngas cleanup systems, and high-pressure solids handling systems. This report summarizes the results of the first demonstration of gasification operation with lignite coal following the 2006 gasifier configuration modifications. This demonstration took place during test campaign TC21, occurring from November 7, 2006, through January 26, 2007. The test campaign began with low sodium lignite fuel, and after 304 hours of operation, the fuel was changed to high sodium lignite, for 34 additional hours of operation. Both fuels were from the North Dakota Freedom mine. Stable operation with low sodium lignite was maintained for extended periods, although operation with high sodium lignite was problematic due to agglomeration formation in the gasifier restricting solids circulation.

Southern Company Services

2007-01-30

173

Power Systems Development Facility Gasification Test Campaign TC22  

SciTech Connect

In support of technology development to utilize coal for efficient, affordable, and environmentally clean power generation, the Power Systems Development Facility (PSDF), located in Wilsonville, Alabama, routinely demonstrates gasification technologies using various types of coals. The PSDF is an engineering scale demonstration of key features of advanced coal-fired power systems, including a KBR Transport Gasifier, a hot gas particulate control device, advanced syngas cleanup systems, and high-pressure solids handling systems. This report summarizes the results of TC22, the first test campaign using a high moisture lignite from Mississippi as the feedstock in the modified Transport Gasifier configuration. TC22 was conducted from March 24 to April 17, 2007. The gasification process was operated for 543 hours, increasing the total gasification operation at the PSDF to over 10,000 hours. The PSDF gasification process was operated in air-blown mode with a total of about 1,080 tons of coal. Coal feeder operation was challenging due to the high as-received moisture content of the lignite, but adjustments to the feeder operating parameters reduced the frequency of coal feeder trips. Gasifier operation was stable, and carbon conversions as high as 98.9 percent were demonstrated. Operation of the PCD and other support equipment such as the recycle gas compressor and ash removal systems operated reliably.

Southern Company Services

2008-11-01

174

Power Systems Development Facility Gasification Test Campaign TC16  

SciTech Connect

In support of technology development to utilize coal for efficient, affordable, and environmentally clean power generation, the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama, routinely demonstrates gasification technologies using various types of coals. The PSDF is an engineering scale demonstration of key features of advanced coal-fired power systems, including a KBR (formerly Kellogg Brown & Root) Transport Gasifier, a hot gas particulate control device, advanced syngas cleanup systems, and high-pressure solids handling systems. This report discusses Test Campaign TC16 of the PSDF gasification process. TC16 began on July 14, 2004, lasting until August 24, 2004, for a total of 835 hours of gasification operation. The test campaign consisted of operation using Powder River Basin (PRB) subbituminous coal and high sodium lignite from the North Dakota Freedom mine. The highest gasifier operating temperature mostly varied from 1,760 to 1,850 F with PRB and 1,500 to 1,600 F with lignite. Typically, during PRB operations, the gasifier exit pressure was maintained between 215 and 225 psig using air as the gasification oxidant and between 145 and 190 psig while using oxygen as the oxidant. With lignite, the gasifier operated only in air-blown mode, and the gasifier outlet pressure ranged from 150 to 160 psig.

Southern Company Services

2004-08-24

175

Power Systems Development Facility Gasification Test Campaign TC17  

SciTech Connect

In support of technology development to utilize coal for efficient, affordable, and environmentally clean power generation, the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama, routinely demonstrates gasification technologies using various types of coals. The PSDF is an engineering scale demonstration of key features of advanced coal-fired power systems, including a KBR (formerly Kellogg Brown & Root) Transport Gasifier, a hot gas particulate control device, advanced syngas cleanup systems, and high-pressure solids handling systems. This report summarizes the results gasification operation with Illinois Basin bituminous coal in PSDF test campaign TC17. The test campaign was completed from October 25, 2004, to November 18, 2004. System startup and initial operation was accomplished with Powder River Basin (PRB) subbituminous coal, and then the system was transitioned to Illinois Basin coal operation. The major objective for this test was to evaluate the PSDF gasification process operational stability and performance using the Illinois Basin coal. The Transport Gasifier train was operated for 92 hours using PRB coal and for 221 hours using Illinois Basin coal.

Southern Company Services

2004-11-30

176

Advanced tendencies in development of photovoltaic cells for power engineering  

NASA Astrophysics Data System (ADS)

Development of solar power engineering must be based on original innovative Russian and world technologies. It is necessary to develop promising Russian technologies of manufacturing of photovoltaic cells and semiconductor materials: chlorine-free technology for obtaining solar silicon; matrix solar cell technology with an efficiency of 25-30% upon the conversion of concentrated solar, thermal, and laser radiation; encapsulation technology for high-voltage silicon solar modules with a voltage up to 1000 V and a service life up to 50 years; new methods of concentration of solar radiation with the balancing illumination of photovoltaic cells at 50-100-fold concentration; and solar power systems with round-the-clock production of electrical energy that do not require energy storage devices and reserve sources of energy. The advanced tendency in silicon power engineering is the use of high-temperature reactions in heterogeneous modular silicate solutions for long-term (over one year) production of heat and electricity in the autonomous mode.

Strebkov, D. S.

2015-01-01

177

Risks and decision making in development of new power plant projects  

E-print Network

Power plant development projects are typically capital intensive and subject to a complex network of interconnected risks that impact development's performance. Failure to develop a power plant to meet performance constraints ...

Kristinsdottir, Asbjorg

2012-01-01

178

Organic Rankine power conversion subsystem development for the small community solar thermal power system  

NASA Technical Reports Server (NTRS)

The development and preliminary test results for an air-cooled, hermetically sealed 20 kW sub E organic Rankine cycle engine/alternator unit for use with point focussing distributed receiver solar thermal power system. A 750 F toluene is the working fluid and the system features a high speed, single-stage axial flow turbine direct-coupled to a permanent magnet alternator. Good performance was achieved with the unit in preliminary tests.

Barber, R. E.; Boda, F. P.

1982-01-01

179

High Power Piezoelectric Characterization for Piezoelectric Transformer Development  

NASA Astrophysics Data System (ADS)

The major goal was to develop characterization techniques to identify and define guidelines to manufacture high power density actuators. We particularly aim at improving the strengths of piezoelectric transformers, namely the high efficiency, ease of manufacturing, low electromagnetic noise, and high power to weight ratio resulting in an adaptor application by identifying material limitations, geometrical limitations and offer guidelines to counter drawbacks limiting the power density. There are 3 losses present in piezoelectrics. Namely dielectric, elastic and piezoelectric losses. These losses can be calculated using mechanical quality factors of the resonating piezoelectric actuator. But in order to calculate all three losses, the mechanical quality factor for resonance and anti resonance need to be measured. Although the mechanical quality factor for resonance is conventionally measured, measurements in antiresonance have been ignored. Since there was no unique measurement technique to address antiresonance and resonance Q in one single sweep, in this study constant vibration velocity method was developed. During the constant vibration velocity measurement, the input electrical energy is monitored and significant differences between resonance and antiresonance drives are observed. For the same output work (identical vibration velocity) significant differences in the losses were observed. Thermographic images have shown increasing temperature differences for resonance and antiresonance nodal point temperatures, with higher vibration velocities. The theoretical evaluation identified the difference observed in the mechanical quality factors at resonance and antiresonance to stem from the piezoelectric loss. In order to investigate losses in the absence of thermal effects a transient characterization technique was adopted. The burst technique, originally developed for characterization of the mechanical quality factor at resonance, has been modified with a switch circuit to leave the resonator in an open circuit condition. The newly introduced open circuits burst have resulted in antiresonance quality factor measurements along with resonance quality factors in a "non-heating" sample. In this technique too, resonance and antiresonance losses showed significant difference. Resonance burst mode characterizations at elevated ambient temperatures have shown that the lower vibration velocity mechanical quality factors appear to be more sensitive to the ambient temperature. Design criteria's to produce the most power dense structure were investigated. Common device shapes were investigated to see which one does enhance the power density of the piezoelectric device. Disk shaped piezoelectric actuators have proven to have lower matching impedances and higher, farther persisting mechanical quality factors with respect to vibration velocities. In order to achieve identical power level, plate shaped samples will have been to strain ~3.5 times more than disk shaped samples. Thus the most power dense structure has been concluded to be a disk shape ~1W/cm3 Once the actuators shape was fixed, further design on structure were conducted with (c)ATILA finite element method. For the transformer application, the design considered following key factors; 1-Controlling the output impedance by optimizing number of layers and layer thicknesses of the multilayer and 2- Evaluation of various electrodes and their affect on high power performance was evaluated. As the thickness of active layers decreased, the number of electrode layers increases. This increase in the metal to piezoelectric ratio and the relative increase in the electrode resistance under high current loads, both will have to be accounted for. Thus; with the piezoelectric composition and the device structure optimized, the research input electrical power. Once the actuators shape was fixed, further design on structure were conducted with (c)ATILA finite element method. For the transformer application, the design considered following key factors; 1-Controlling the output imped

Ural, Seyit O.

180

ANEMOS: Development of a Next Generation Wind Power  

E-print Network

This paper presents the objectives and the research work carried out in the frame of the ANEMOS project on short-term wind power forecasting. The aim of the project is to develop accurate models that substantially outperform current state-of-the-art methods, for onshore and offshore wind power forecasting, exploiting both statistical and physical modeling approaches. The project focus on prediction horizons up to 48 hours ahead and investigates predictability of wind for higher horizons up to 7 days ahead useful i.e. for maintenance scheduling. Emphasis is given on the integration of highresolution meteorological forecasts. For the offshore case, marine meteorology is considered as well as information by satellite-radar images. An integrated software platform, `ANEMOS', is developed to host the various models. This system will be installed by several utilities for on-line operation at onshore and offshore wind farms for prediction at a local, regional and national scale. The applications include different terrain types and wind climates, on- and offshore cases, and interconnected or island grids. The on-line operation by the utilities will allow validation of the models and an analysis of the value of wind prediction for a competitive integration of wind energy in the developing liberalized electricity markets in the EU.

Forecasting System For; G. Kariniotakis; J. Ottavi; U. Focken; M. Lange; J. Kintxo; J. Usaola; I. Sanchez; D. Mccoy; I. Marti H. Madsen; M. Collmann; A. Gig; G. Gonzales

2003-01-01

181

Power Systems Development Facility. First quarterly report, 1997  

SciTech Connect

The objective of this project, herein referred to as the Power Systems Development Facility (PSDF), is to evaluate hot gas particle control technologies using coal derived gas streams. This project entails the design, construction, installation, and use of a flexible test facility which can operate under realistic gasification and combustion conditions. The major particulate control device (PCD) issues to be addressed include the integration of the PCDs into coal utilization systems, on-line cleaning techniques, chemical and thermal degradation of components, fatigue or structural failures, blinding, collection efficiency as a function of particle size, and scale-up of particulate control systems to commercial size.

NONE

1997-07-01

182

Continuing Development for Free-Piston Stirling Space Power Systems  

NASA Astrophysics Data System (ADS)

Long-life radioisotope power generators based on free-piston Stirling engines are an energy-conversion solution for future space applications. The high efficiency of Stirling machines makes them more attractive than the thermoelectric generators currently used in space. Stirling Technology Company (STC) has been developing free-piston Stirling machines for over 30 years, and its family of Stirling generators is ideally suited for reliable, maintenance-free operation. This paper describes recent progress and status of the STC RemoteGen™ 55 W-class Stirling generator (RG-55), presents an overview of recent testing, and discusses how the technology demonstration design has evolved toward space-qualified hardware.

Peterson, Allen A.; Qiu, Songgang; Redinger, Darin L.; Augenblick, John E.; Petersen, Stephen L.

2004-02-01

183

Access to Power: Governance and Development in the Pakistani Electrical Power Sector  

NASA Astrophysics Data System (ADS)

This dissertation explores governance in Pakistan through a study of the state-run electrical power sector. At both the micro and macro level, the Pakistani power sector provides a lens into the heart of the Pakistani state and its governance institutions. This ethnographic and historical study offers an in-depth look at state operations in a developing country, situates the current Pakistani power crisis in a larger context of continuity through periods of dictatorship and democracy, and suggests how efforts to make state service delivery more responsive to citizens might be reconceived. A historical review of the Pakistani power sector establishes first and foremost that the current crisis is the product of longer-term processes for which the policy solutions currently being proposed (with the support of international donors and multilateral lenders) are inadequate. Depoliticized attempts at power sector reform have little to offer in light of the pervasively informal and negotiated nature of the fragmented Pakistani state. The institutions of power sector governance are mutually constituted by the formal rules and the informal---personal relationships, language, violence, money, and power. These rules of the game are as relevant to relations within and between public sector organizations as they are to the engagement of citizens with their state. The same rules apply at the margins of the state---informal squatter settlements---as at the core, though the resources brought to bear and the resultant outcomes are different. The internal incoherence of this state underscores the limitations of formal rules in determining outcomes, and the poor prospects for reform efforts that focus exclusively on the formal aspects of governance. To proactively engage with the question of political will leads away from top-down policy perspectives and counter to the depoliticizing tendencies that currently shape policy reforms. Instead, an energized and informed local participation can be a counterweight to the inertial tendencies of a Pakistani state whose reforms tend to be co-opted by existing power centers rather than result in changed outcomes.

Naqvi, Ijlal

184

An impedance profile of a commercial power grid and a tester power distribution system is developed in this paper.  

E-print Network

in measurement resolution derives from the fil- tering characteristics of the resistive, capacitive and inducAbstract An impedance profile of a commercial power grid and a tester power distribution system is developed in this paper. The profile is used to identify the measurable frequency range of the power supply

Plusquellic, James

185

Economic viability of photovoltaic power for development assistance applications  

NASA Technical Reports Server (NTRS)

This paper briefly discusses the development assistance market and examines a number of specific photovoltaic (PV) development assistance field tests, including water pumping/grain grinding (Tangaye, Upper Volta), vaccine refrigerators slated for deployment in 24 countries, rural medical centers to be installed in Ecuador, Guyana, Kenya and Zimbabwe, and remote earth stations to be deployed in the near future. A comparison of levelized energy cost for diesel generators and PV systems covering a range of annual energy consumptions is also included. The analysis does not consider potential societal, environmental or political benefits associated with PV power. PV systems are shown to be competitive with diesel generators, based on life cycle cost considerations, assuming a system price of $20/W(peak), for applications having an annual energy demand of up to 6000 kilowatt-hours per year.

Bifano, W. J.

1982-01-01

186

Private power development and environmental protection in India  

SciTech Connect

This report assesses relationships between private power development in India and environmental protection in that country. The central question is whether private firms generating and distributing electricity in developing countries will do a better or a worse job in environmental protection, as a part of their overall corporate responsibility, than public-sector institutions. After reviewing the fundamental question, why it is asked, and the context in which it operates in the nation of India, this report continues with an analysis of available information, quantitative and qualitative, that can help to resolve the issues in the particular case of India. Finally, it ends with conclusions from the analysis and recommendations for reducing remaining uncertainties in the future.

Das, S.; Wilbanks, T.J.

1997-12-01

187

Duke Power Company's development of a biofouling monitoring program  

SciTech Connect

Biofouling programs at Duke Power Company (DPC) can be traced to the invasion of the Catawba River system by Corbicula in 1968. Raw water systems at Plant Allen, a coal-fired station on Lake Wylie, became heavily infested by clams during the 1970s. Development of programs was accelerated as a result of the shutdown of Catawba nuclear station (CNS) on lake Wylie in 1986 due to clam infestations in safety-related systems, increased biofouling problems at McGuire nuclear station (MNS) on lake Norman, and by the issuance of the US Nuclear Regulatory Commission's (NRC's) Generic Letter (GL) 89-13 (issued in 1989). Historical data were reviewed to identify pertinent questions, and a refined, multifaceted Corbicula monitoring plan was developed. This plan was implemented at CNS and MNS in 1989.

Derwort, J.E.; Gnilka, A. (Duke Power Co., Huntersville, NC (United States))

1991-11-01

188

Economic viability of photovoltaic power for development assistance applications  

SciTech Connect

This paper briefly discusses the development assistance market and examines a number of specific PV development assistance field tests including water pumping/grain grinding (Tangaye, Upper Volta), vaccine refrigerators slated for deployment in 24 countries, rural medical centers to be installed in Ecuador, Guyana, Kenya and Zimbabwe, and remote earth stations to be deployed in the near future. A comparison of levelized energy cost for diesel generators and PV systems covering a range of annual energy consumptions is also included. The analysis does not consider potential societal, environmental or political benefits associated with PV power. PV systems are shown to be competitive with diesel generators based on life cycle cost considerations, assuming a system price of $20/W(peak), for applications having an annual energy demand of up to 6000 kilowatt-hours per year.

Bifano, W.J.

1982-09-01

189

Advanced on-site power plant development technology program  

NASA Technical Reports Server (NTRS)

A 30-cell, full area short stack containing advanced cell features was tested for 2900 hours. A stack acid addition approach was selected and will be evaluated on the stack at 5000 hours test time. A brassboard inverter was designed and fabrication was initiated. Evaluation of this brassboard inverter will take place in 1984. A Teflon coated commercial heat exchanger was selected as the preferred approach for the acid condenser. A reformer catalyst with significantly less pressure drop and equivalent performance relative to the 40-K baseline catalyst was selected for the development reformer. The early 40-kW field power plant history was reviewed and adjustments were made to the On-Site Technology Development Program to address critical component issues.

1984-01-01

190

Development and Commercialization of the Lunar Solar Power System  

NASA Astrophysics Data System (ADS)

The proposed Lunar Solar Power (LSP) System consists of pairs of power bases located on opposite limbs of the Moon as seen from Earth. The power bases collect the solar energy and convert it to beams of microwaves. The microwaves are delivered directly to moonward-facing receivers on Earth or indirectly through relay satellites in orbit about Earth (1, 2, 3, 4). The LSP System may be the only reasonable method for establishing sustainable global energy prosperity within two generations. Commercial power prosperity requires at least 2 kWe/person. For ten billion people this implies 20 TWe and 2,000 TWe-y of electric energy or ~6,000 TWt-y of thermal energy per century (5, 6, 7, 8). A brief overview is presented of a reference LSP System that supplies 20 TWe by 2050. The engineering scales and the cost and benefits of this system are described. In order to provide low cost commercial electric energy, the power bases are made primarily of local lunar materials by machines, facilities, and people deployed from Earth (1, 2, 3). In addition, lunar production machinery can be made primarily from lunar materials. Advantages of this approach, versus the reference LSP System, are discussed. Full-scale production of a LSP System will certainly be proceeded by terrestrial and lunar operation of the production machinery and a small-scale demonstration of the operational system (1). Using government funds to establishing a permanent lunar base and the associated transportation system would significantly reduce the upfront cost for the demonstration of a commercial LSP System (2). The government program would provide a legal framework for commercial development of the LSP System (3, 9). The LSP System offers the opportunity to establish a materials industry on the Moon that can produce a growing mass and variety of goods and enable new services of benefit on the Earth and the Moon (10). New priorities are suggested for civilian space programs that can accelerate the establishment of a demonstration LSP System and growing commercialization of the Moon and cis-lunar space. 1. Criswell, David R. (2001) Lunar Solar Power System: Industrial Research, Development, and Demonstration, Session 1.2.2: Hydroelectricity, Nuclear Energy and New Renewables, 18th World Energy Congress. [http://www.wec.co.ukin the Congress Papers, Discussion Sessions] 2. Criswell, D. R. and Waldron, R. D. 1993. International Lunar Base and Lunar-based Power System to Supply Earth with Electric Power, Acta Astronautica, Vol. 29, No. 6, pp. 469-480. Pergamon Press Ltd. 3. NASA TASK FORCE. 1989 (July) Report of NASA Lunar Energy Enterprise Case Study Task Force. NASA Technical Memo 101652. 163pp. NASA Headquarters, Office of Exploration (Code Z), Washington, D.C. 20546. 4. Moore, T. (2000, Spring) "Renewed interest in space solar power," EPRI Journal, pp. 6-17. 5. World Energy Council (2000) Energy for Tomorrow's World - Acting Now!, 175pp., Atalink Projects Ltd, London. 6. Criswell, David R. (2002) Energy Prosperity within the 21st Century and Beyond: Options and the Unique Roles of the Sun and the Moon. Chapter 9: Innovative Solutions To CO2 Stabilization, R. Watts (editor), Cambridge Un. Press 7. Strong, Maurice (2001) Where on Earth are We Going?, (See p. 351-352), 419pp., Random House (forward by Kofi Annan) 8. Criswell, D. R. and Thompson, R. G. (1996), "Data envelopment analysis of space and terrestrial-based large scale commercial power systems for Earth: A prototype analysis of their relative economic advantages," Solar Energy, 56, No. 1: 119-131. 9 ILEWG (1997), Proc. 2nd International Lunar Workshop, organized by: International Lunar Exploration Working Group, Inst. Space and Astronautical Science, and National Space Development Agency of Japan, Kyoto, Japan, (October 14 - 17), 89pp. 10. Criswell, D.R. 2000 (October) Commercial power for Earth and lunar industrial development, 7pp., 51st Congress of the International Astronautical Federation (IAF). (Rio de Janeiro, Brazil). Paper #IAA-00-IAA.13.2.06.

Criswell, D. R.

2002-01-01

191

Power Systems Development Facility Gasification Test Campaign TC24  

SciTech Connect

In support of technology development to utilize coal for efficient, affordable, and environmentally clean power generation, the Power Systems Development Facility (PSDF), located in Wilsonville, Alabama, routinely demonstrates gasification technologies using various types of coals. The PSDF is an engineering scale demonstration of key features of advanced coal-fired power systems, including a KBR Transport Gasifier, a hot gas particulate control device, advanced syngas cleanup systems, and high-pressure solids handling systems. This report summarizes the results of TC24, the first test campaign using a bituminous coal as the feedstock in the modified Transport Gasifier configuration. TC24 was conducted from February 16, 2008, through March 19, 2008. The PSDF gasification process operated for about 230 hours in air-blown gasification mode with about 225 tons of Utah bituminous coal feed. Operational challenges in gasifier operation were related to particle agglomeration, a large percentage of oversize coal particles, low overall gasifier solids collection efficiency, and refractory degradation in the gasifier solids collection unit. The carbon conversion and syngas heating values varied widely, with low values obtained during periods of low gasifier operating temperature. Despite the operating difficulties, several periods of steady state operation were achieved, which provided useful data for future testing. TC24 operation afforded the opportunity for testing of various types of technologies, including dry coal feeding with a developmental feeder, the Pressure Decoupled Advanced Coal (PDAC) feeder; evaluating a new hot gas filter element media configuration; and enhancing syngas cleanup with water-gas shift catalysts. During TC24, the PSDF site was also made available for testing of the National Energy Technology Laboratory's fuel cell module and Media Process Technology's hydrogen selective membrane.

Southern Company Services

2008-03-30

192

Power Systems Development Facility Gasification Test Campaign TC25  

SciTech Connect

In support of technology development to utilize coal for efficient, affordable, and environmentally clean power generation, the Power Systems Development Facility (PSDF), located in Wilsonville, Alabama, routinely demonstrates gasification technologies using various types of coals. The PSDF is an engineering scale demonstration of key features of advanced coal-fired power systems, including a KBR Transport Gasifier, a hot gas particulate control device, advanced syngas cleanup systems, and high-pressure solids handling systems. This report summarizes the results of TC25, the second test campaign using a high moisture lignite coal from the Red Hills mine in Mississippi as the feedstock in the modified Transport Gasifier configuration. TC25 was conducted from July 4, 2008, through August 12, 2008. During TC25, the PSDF gasification process operated for 742 hours in air-blown gasification mode. Operation with the Mississippi lignite was significantly improved in TC25 compared to the previous test (TC22) with this fuel due to the addition of a fluid bed coal dryer. The new dryer was installed to dry coals with very high moisture contents for reliable coal feeding. The TC25 test campaign demonstrated steady operation with high carbon conversion and optimized performance of the coal handling and gasifier systems. Operation during TC25 provided the opportunity for further testing of instrumentation enhancements, hot gas filter materials, and advanced syngas cleanup technologies. The PSDF site was also made available for testing of the National Energy Technology Laboratory's fuel cell module and Media Process Technology's hydrogen selective membrane with syngas from the Transport Gasifier.

Southern Company Services

2008-12-01

193

Development of a high temperature solar powered water chiller  

NASA Astrophysics Data System (ADS)

The objectives of this program are: to develop a high temperature solar powered air cooled 25 ton chiller utilizing 250 to 300 F solar hot water suitable for commercial and multi-family applications; to study, design, and build a prototype Rankine powered vapor compression cycle; and to demonstrate and evaluate performance through steady state and dynamic laboratory testing. Cycle studies and preliminary turbo machine studies were completed under Phase I establishing the final conceptual approach and anticipated cost/performance. The evaluation of the working fluid thermal stability has satisfactorily shown that R-113 has excellent life potential in an oil-free steel boiler at the maximum expected temperature, 320 F, for this application. The detailed design of the turbo machine and the chiller has been completed. The turbomachine has been completed and has successfully passed its qualification tests on air. The chiller has been built in the water cooled configuration, has been installed in a test facility, instrumented and charged. A two stage boiler feed pump has been developed and successfully tested on R-113 in a separate loop.

English, R. A.

1982-03-01

194

Development Status of the Fission Power System Technology Demonstration Unit  

NASA Technical Reports Server (NTRS)

This paper summarizes the progress that has been made in the development of the Fission Power System Technology Demonstration Unit (TDU). The reactor simulator core and Annular Linear Induction Pump have been fabricated and assembled into a test loop at the NASA Marshall Space Flight Center. A 12 kWe Power Conversion Unit (PCU) is being developed consisting of two 6 kWe free-piston Stirling engines. The two 6 kWe engines have been fabricated by Sunpower Inc. and are currently being tested separately prior to integration into the PCU. The Facility Cooling System (FCS) used to reject convertor waste heat has been assembled and tested at the NASA Glenn Research Center (GRC). The structural elements, including a Buildup Assembly Platform (BAP) and Upper Truss Structure (UTS) have been fabricated, and will be used to test cold-end components in thermal vacuum prior to TDU testing. Once all components have been fully tested at the subsystem level, they will be assembled into an end-to-end system and tested in thermal vacuum at NASA GRC.

Briggs, Maxwell H.; Gibson, Marc A.; Geng, Steven M; Pearson, Jon Boise; Godfroy, Thomas

2012-01-01

195

Development Status of the Fission Power System Technology Demonstration Unit  

NASA Technical Reports Server (NTRS)

This paper summarizes the progress that has been made in the development of the Fission Power System Technology Demonstration Unit (TDU). The reactor simulator core and Annular Linear Induction Pump have been fabricated and assembled into a test loop at the NASA Marshall Space Flight Center. A 12 kWe Power Conversion Unit (PCU) is being developed consisting of two 6 kWe free-piston Stirling engines. The two 6 kWe engines have been fabricated by Sunpower Inc. and are currently being tested separately prior to integration into the PCU. The Facility Cooling System (FCS) used to reject convertor waste heat has been assembled and tested at the NASA Glenn Research Center (GRC). The structural elements, including a Buildup Assembly Platform (BAP) and Upper Truss Structure (UTS) have been fabricated, and will be used to test cold-end components in thermal vacuum prior to TDU testing. Once all components have been fully tested at the subsystem level, they will be assembled into an end-to-end system and tested in thermal vacuum at GRC.

Briggs, Maxwell H.; Gibson, Marc A.; Geng, Steven M.; Pearson, Jon Boise; Godfoy, Thomas

2012-01-01

196

The challenge of developing structural materials for fusion power systems  

NASA Astrophysics Data System (ADS)

Nuclear fusion can be one of the most attractive sources of energy from the viewpoint of safety and minimal environmental impact. Central in the goal of designing a safe, environmentally benign, and economically competitive fusion power system is the requirement for high performance, low activation materials. The general performance requirements for such materials have been defined and it is clear that materials developed for other applications (e.g. aerospace, nuclear fission, fossil energy systems) will not fully meet the needs of fusion. Advanced materials, with composition and microstructure tailored to yield properties that will satisfy the specific requirements of fusion must be developed. The international fusion programs have made significant progress towards this goal. Compositional requirements for low activation lead to a focus of development efforts on silicon carbide composites, vanadium alloys, and advanced martensitic steels as candidate structural material systems. Control of impurities will be critically important in actually achieving low activation but this appears possible. Neutron irradiation produces significant changes in the mechanical and physical properties of each of these material systems raising feasibility questions and design limitations. A focus of the research and development effort is to understand these effects, and through the development of specific compositions and microstructures, produce materials with improved and adequate performance. Other areas of research that are synergistic with the development of radiation resistant materials include fabrication, joining technology, chemical compatibility with coolants and tritium breeders and specific questions relating to the unique characteristics of a given material (e.g. coatings to reduce gas permeation in SiC composites) or design concept (e.g. electrical insulator coatings for liquid metal concepts).

Bloom, Everett E.

1998-10-01

197

Engineering Development of Coal-Fired High Performance Power Systems  

SciTech Connect

This report presents work carried out under contract DE-AC22-95PC95144 ''Engineering Development of Coal-Fired High Performance Systems Phase II and III.'' The goals of the program are to develop a coal-fired high performance power generation system (HIPPS) that is capable of: thermal efficiency (HHV) {ge} 47% NOx, SOx, and particulates {le} 10% NSPS (New Source Performance Standard) coal providing {ge} 65% of heat input all solid wastes benign cost of electricity {le}{le} 90% of present plants Phase I, which began in 1992, focused on the analysis of various configurations of indirectly fired cycles and on technical assessments of alternative plant subsystems and components, including performance requirements, developmental status, design options, complexity and reliability, and capital and operating costs. Phase I also included preliminary R&D and the preparation of designs for HIPPS commercial plants approximately 300 MWe in size. Phase II, had as its initial objective the development of a complete design base for the construction and operation of a HIPPS prototype plant to be constructed in Phase III. As part of a descoping initiative, the Phase III program has been eliminated and work related to the commercial plant design has been ended. The rescoped program retained a program of engineering research and development focusing on high temperature heat exchangers, e.g. HITAF development (Task 2); a rescoped Task 6 that is pertinent to Vision 21 objectives and focuses on advanced cycle analysis and optimization, integration of gas turbines into complex cycles, and repowering designs; and preparation of the Phase II Technical Report (Task 8). This rescoped program deleted all subsystem testing (Tasks 3, 4, and 5) and the development of a site-specific engineering design and test plan for the HIPPS prototype plant (Task 7). Work reported herein is from: Task 2.2 HITAF Air Heaters

None

2000-12-31

198

Prospectives for China's solar thermal power technology development  

Microsoft Academic Search

China's total installed electrical power capacity reached 700GW by the end of 2007 and is predicted to surpass 900GW in 2010. The rapid increase in energy demand and increasing global warming have both pushed China to change its current electrical power structure where coal power accounts for nearly 75% of the total electric power generation. China has already become the

Zhifeng Wang

2010-01-01

199

Development of an underwater manipulator for maintaining nuclear power reactor  

Microsoft Academic Search

The safety and reliability of nuclear power plants has become more important recently. Inspection and maintenance of nuclear power plants should be continuously implemented. However, the limitation of a radiation exposure makes it difficult to work in nuclear power plants. So a robot is very useful to inspect and maintain the components of nuclear power plants because of reducing radiation

Sung-Uk Lee; Young-Soo Choi; Kyung-Min Jeong; Seungho Jung

2007-01-01

200

LIFE: a sustainable solution for developing safe, clean fusion power.  

PubMed

The National Ignition Facility (NIF) at the Lawrence Livermore National Laboratory (LLNL) in California is currently in operation with the goal to demonstrate fusion energy gain for the first time in the laboratory-also referred to as "ignition." Based on these demonstration experiments, the Laser Inertial Fusion Energy (LIFE) power plant is being designed at LLNL in partnership with other institutions with the goal to deliver baseload electricity from safe, secure, sustainable fusion power in a time scale that is consistent with the energy market needs. For this purpose, the LIFE design takes advantage of recent advances in diode-pumped, solid-state laser technology and adopts the paradigm of Line Replaceable Units used on the NIF to provide high levels of availability and maintainability and mitigate the need for advanced materials development. The LIFE market entry plant will demonstrate the feasibility of a closed fusion fuel cycle, including tritium breeding, extraction, processing, refueling, accountability, and safety, in a steady-state power-producing device. While many fusion plant designs require large quantities of tritium for startup and operations, a range of design choices made for the LIFE fuel cycle act to reduce the in-process tritium inventory. This paper presents an overview of the delivery plan and the preconceptual design of the LIFE facility with emphasis on the key safety design principles being adopted. In order to illustrate the favorable safety characteristics of the LIFE design, some initial accident analysis results are presented that indicate potential for a more attractive licensing regime than that of current fission reactors. PMID:23629070

Reyes, Susana; Dunne, Mike; Kramer, Kevin; Anklam, Tom; Havstad, Mark; Mazuecos, Antonio Lafuente; Miles, Robin; Martinez-Frias, Joel; Deri, Bob

2013-06-01

201

Development of high-power gyrotrons with gradually tapered cavity  

SciTech Connect

In high power gyrotrons, the parasitic modes coupled with the operating mode cannot be avoided in the beam-wave interaction. These parasitic modes will decrease the efficiency of the gyrotrons. The purity of the operating mode affected by different tapers should be carefully studied. The steady-state self-consistent nonlinear theory for gyrotron with gradually tapered cavity is developed in this paper. A steady-state calculation code including 'cold cavity' and 'hot cavity' is designed. By comparison, a time-domain model analysis of gyrotron operation is also studied by particle-in-cell (PIC). It is found that the tapers of gyrotron have different influences on the modes coupling between the operating mode and the parasitic modes. During the study, an example of 94 GHz gyrotron with pure operating mode TE{sub 03} has been designed. The purity of the operating mode in the optimized cavity is up to -77 dB, and in output waveguide of the cavity is up to -76 dB. At the same time, the beam-wave interaction in the designed cavity has been simulated, too. An output power of 120 kW, corresponding to 41.6% efficiency and an oscillation frequency of 94.099 GHz have been achieved with a 50 kV, 6 A helical electron beam at a guiding magnetic field of 3.5485 T. The results show that the power in spurious modes of the optimized cavity may be kept far below than that of the traditional tapered cavity.

Lei Chaojun [Terahertz Science and Technology Research Center, University of Electronics Science and Technology of China, Chengdu 610054 (China); The Chinese People's Armed Police Force Academy, Langfang 065000 (China); Yu Sheng; Niu Xinjian; Liu Yinghui; Li Hongfu; Li Xiang [Terahertz Science and Technology Research Center, University of Electronics Science and Technology of China, Chengdu 610054 (China)

2012-12-15

202

Progress in developing tidal electric power plants reported  

NASA Astrophysics Data System (ADS)

The natural energy potential of tides on the shores of the U.S.S.R. is equal to about a third of the world's total. The Achilles heel of tidal power plants is their pulsating operation. One solution to this problem was to build a hydroelectric power plant for use in tandem with the tidal power plant. During lulls in the tidal plant, the hydraulic power plant switches on at full power. Possible sites for dual plants were discussed.

Blokhnin, A.

1984-12-01

203

Experimental development of power consumption in LIPCA-C2  

NASA Astrophysics Data System (ADS)

Currently a carbon/glass fiber, piezoelectric-ceramic composite, LIPCA, is being investigated for use in micro aerial vehicles, micropumps, vibration control systems, and a number of bio-inspired robotic devices. Many of these applications help demonstrate the growing trend in miniaturization that drives innovative developments in products ranging from pacemakers to cell phones. When designing products for our ever shrinking world not only must the size of the principal components of the system be taken into consideration but also the components of the system that afford functionality as a bi-product of their inclusion. To this end we are referring to the mechanical or electrical systems that provide these devices with the necessary energy to perform their tasks. In order to make efficient use of LIPCA in the previously mentioned applications, the ability to forecast power consumption is essential. In the present investigation, a method of modeling the power consumption of piezoelectric devices is presented and evaluated over a range of frequencies and voltages. Effects of variation in actuator dimension, driving voltage, and frequency are presented. Accuracy of the model is assessed and factors leading to inaccuracies are identified.

Smith, Byron F.; Goo, Nam Seo; Mossi, Karla

2007-04-01

204

Geometry, contact, surface, and optical developments for photoconductive power switches  

SciTech Connect

Photoconductive Power Switches (PCPSs) have the advantages of precise control, extremely fast closure times, extremely low inductances and scalability to very high voltages and currents. PCPSs have these advantages because the size or power of the switch is not related to its closure time. The closure time is determined by the external optical source that uniformly illuminates the PCPS between the electrodes. Because carriers are generated uniformly between the electrodes at the desired density, current can flow through the switch immediately without waiting for carrier transient delays. The operating voltage is determined by the switch length l, and the operating current is determined by the switch width w. The electrodes can be made as wide as desired so that the inductance can be extremely low, or the area available for heat removal can be increased and the entire switch brough into conduction at the same instant if the same optical pulse and path length are used. This paper describes recent research at Los Alamos that has improved PCPS contact fabrication technology, has developed a simple optical control illumination system using fiber optics and rectangular optics, and has improved photoconductor surface fabrication methods and processes for high electric field operation.

Nunnally, W.C.; Hammond, R.B.; Wagner, R.S.

1984-01-01

205

Development of a naturally aspired thermosyphon for power amplifier cooling  

NASA Astrophysics Data System (ADS)

This paper details the early development steps of a two-phase thermosyphon thermal management solution for power amplifiers (PA) in the telecommunication industry. These components, attached to a vertical PCB within an enclosure between the RF filter and a natural or forced convection heat sink, dissipate a large amount of heat with a high heat flux density. Currently cooled by direct contact to a shared heat sink, they tend to spread heat towards other components of their board, affecting their reliability. A thermosyphon thus appear as an ideal thermal management solution to transport the heat from the power amplifiers in order to dissipate it to a remote and dedicated natural convection heat sink. In the present study, the performance and the heat spreading of a forced convection unit is measured. A thermosyphon solution is then designed with a flat vertical evaporator and a radial natural convection heat sink and condenser. The performance of the thermosyphon thermal management solution is measured and compared to the initial solution. The limits and improvement needs of the thermosyphon solution are then discussed.

Siedel, S.; Robinson, A. J.; Kempers, R.; Kerslake, S.

2014-07-01

206

Power systems development facility. Quarterly report, January 1995--March 1995  

SciTech Connect

The objective of this project is to evaluate hot gas particle control technologies using coal-derived gas streams. This will entail the design, construction, installation, and use of a flexible test facility which can operate under realistic gasification and combustion conditions. The major particulate control device issues to be addressed include the integration of the particulate control devices into coal utilization systems, on-line cleaning techniques, chemical and thermal degradation of components, fatigue or structural failures, blinding, collection efficiency as a function of particle size, and scale-up of particulate control systems to commercial size. The conceptual design of the facility was extended to include a within scope, phased expansion of the existing Hot Gas Cleanup Test Facility Cooperative Agreement to also address systems integration issues of hot particulate removal in advanced coal-based power generation systems. This expansion included the consideration of the following modules at the test facility in addition to the original Transport Reactor gas source and Hot Gas Cleanup Units: (1) Carbonizer/Pressurized Circulating Fluidized Bed Gas Source. (2) Hot Gas Cleanup Units to mate to all gas streams. (3) Combustion Gas Turbine. (4) Fuel Cell and associated gas treatment. This expansion to the Hot Gas Cleanup Test Facility is herein referred to as the Power Systems Development Facility (PSDF). The major emphasis during this reporting period was continuing the detailed design of the facility and integrating the particulate control devices (PCDs) into structural and process designs.

NONE

1995-05-01

207

Power Systems Development Facility. Quarterly report, January--March 1996  

SciTech Connect

The objective of this project is to evaluate hot gas particle control technologies using coal-derived gas streams. This will entail the design, construction, installation, and use of a flexible test facility which can operate under realistic gasification and combustion conditions. The major particular control device issues to be addressed include the integration of the particulate control devices into coal utilization systems, on-line cleaning techniques, chemical and thermal degradation of components, fatigue or structural failures, blinding, collection efficiency as a function of particle size, and scale-up of particulate control systems to commercial size. The conceptual design of the facility was extended to include a within scope, phased expansion of the existing Hot Gas Cleanup Test Facility Cooperative Agreement to also address systems integration issues of hot particulate removal in advanced coal-based power generation systems. This expansion to the Hot Gas Cleanup Test Facility is herein referred to as the Power Systems Development Facility (PSDF). The major emphasis during this reporting period was continuing the detailed design of the Foster Wheeler portion of the facility towards completion and integrating the balance-of-plant processes and particulate control devices (PCDs) into the structural and process designs. Substantial progress in construction activities was achieved during the quarter.

NONE

1996-05-01

208

Power Systems Development Facility Gasification Test Run TC09  

SciTech Connect

This report discusses Test Campaign TC09 of the Kellogg Brown & Root, Inc. (KBR) Transport Gasifier train with a Siemens Westinghouse Power Corporation (Siemens Westinghouse) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The Transport Gasifier is an advanced circulating fluidized-bed gasifier designed to operate as either a combustor or a gasifier in air- or oxygen-blown mode of operation using a particulate control device (PCD). The Transport Gasifier was operated as a pressurized gasifier during TC09 in air- and oxygen-blown modes. Test Run TC09 was started on September 3, 2002, and completed on September 26, 2002. Both gasifier and PCD operations were stable during the test run, with a stable baseline pressure drop. The oxygen feed supply system worked well and the transition from air to oxygen was smooth. The gasifier temperature varied between 1,725 and 1,825 F at pressures from 125 to 270 psig. The gasifier operates at lower pressure during oxygen-blown mode due to the supply pressure of the oxygen system. In TC09, 414 hours of solid circulation and over 300 hours of coal feed were attained with almost 80 hours of pure oxygen feed.

Southern Company Services

2002-09-30

209

Power Systems Development Facility Gasification Test Run TC11  

SciTech Connect

This report discusses Test Campaign TC11 of the Kellogg Brown & Root, Inc. (KBR) Transport Gasifier train with a Siemens Westinghouse Power Corporation (Siemens Westinghouse) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The Transport Gasifier is an advanced circulating fluidized-bed gasifier designed to operate as either a combustor or a gasifier in air- or oxygen-blown mode of operation using a particulate control device (PCD). Test run TC11 began on April 7, 2003, with startup of the main air compressor and the lighting of the gasifier start-up burner. The Transport Gasifier operated until April 18, 2003, when a gasifier upset forced the termination of the test run. Over the course of the entire test run, gasifier temperatures varied between 1,650 and 1,800 F at pressures from 160 to 200 psig during air-blown operations and around 135 psig during enriched-air operations. Due to a restriction in the oxygen-fed lower mixing zone (LMZ), the majority of the test run featured air-blown operations.

Southern Company Services

2003-04-30

210

Development Efforts Expanded in Ion Propulsion: Ion Thrusters Developed With Higher Power Levels  

NASA Technical Reports Server (NTRS)

The NASA Glenn Research Center was the major contributor of 2-kW-class ion thruster technology to the Deep Space 1 mission, which was successfully completed in early 2002. Recently, NASA s Office of Space Science awarded approximately $21 million to Glenn to develop higher power xenon ion propulsion systems for large flagship missions such as outer planet explorers and sample return missions. The project, referred to as NASA's Evolutionary Xenon Thruster (NEXT), is a logical follow-on to the ion propulsion system demonstrated on Deep Space 1. The propulsion system power level for NEXT is expected to be as high as 25 kW, incorporating multiple ion thrusters, each capable of being throttled over a 1- to 6-kW power range. To date, engineering model thrusters have been developed, and performance and plume diagnostics are now being documented. The project team-Glenn, the Jet Propulsion Laboratory, General Dynamics, Boeing Electron Dynamic Devices, the Applied Physics Laboratory, the University of Michigan, and Colorado State University-is in the process of developing hardware for a ground demonstration of the NEXT propulsion system, which comprises a xenon feed system, controllers, multiple thrusters, and power processors. The development program also will include life assessments by tests and analyses, single-string tests of ion thrusters and power systems, and finally, multistring thruster system tests in calendar year 2005. In addition, NASA's Office of Space Science selected Glenn to lead the development of a 25-kW xenon thruster to enable NASA to conduct future missions to the outer planets of Jupiter and beyond, under the High Power Electric Propulsion (HiPEP) program. The development of a 100-kW-class ion propulsion system and power conversion systems are critical components to enable future nuclear-electric propulsion systems. In fiscal year 2003, a team composed of Glenn, the Boeing Company, General Dynamics, the Applied Physics Laboratory, the Naval Research Laboratory, the University of Wisconsin, the University of Michigan, and Colorado State University will perform a 6-month study that will result in the design of a 25-kW ion thruster, a propellant feed system, and a power processing architecture. The following 2 years will involve hardware development, wear tests, single-string tests of the thruster-power circuits and the xenon feed system, and subsystem service life analyses. The 2-kW-class ion propulsion technology developed for the Deep Space 1 mission will be used for NASA's discovery mission Dawn, which involves maneuvering a spacecraft to survey the asteroids Ceres and Vesta. The 6-kW-class ion thruster subsystem technology under NEXT is scheduled to be flight ready by calendar year 2006. The less mature 25- kW ion thruster system under HiPEP is expected to be ready for a flight advanced development program in calendar year 2006.

Patterson, Michael J.; Rawlin, Vincent K.; Sovey, James S.

2003-01-01

211

PLC-Based Safety Critical Software Development for Nuclear Power Plants  

E-print Network

development technique for nuclear power plants'I&C soft- ware controllers. To improve software safety, we in developing safety-critical control software for a Korean nuclear power plant, and experience to date has been-based digital systems [4]. Software development process for control software in nuclear power plants gener- ally

212

Power Electronics Being Developed for Deep Space Cryogenic Applications  

NASA Technical Reports Server (NTRS)

Electronic circuits and systems designed for deep space missions need to operate reliably and efficiently in harsh environments that include very low temperatures. Spacecraft that operate in such cold environments carry a large number of heaters so that the ambient temperature for the onboard electronics remains near 20 C. Electronics that can operate at cryogenic temperatures will simplify system design and reduce system size and weight by eliminating the heaters and their associated structures. As a result, system development and launch cost will be reduced. At the NASA Glenn Research Center, an ongoing program is focusing on the development of power electronics geared for deep space low-temperature environments. The research and development efforts include electrical components design, circuit design and construction, and system integration and demonstration at cryogenic temperatures. Investigations are being carried out on circuits and systems that are targeted for use in NASA missions where low temperatures will be encountered: devices such as ceramic and tantalum capacitors, metal film resistors, semiconductor switches, magnetics, and integrated circuits including dc/dc converters, operational amplifiers, voltage references, and motor controllers. Test activities cover a wide range of device and circuit performance under simple as well as complex test conditions, such as multistress and thermal cycling. The effect of low-temperature conditions on the switching characteristics of an advanced silicon-on-insulator field effect transistor is shown. For gate voltages (VGS) below 2.6 V, drain currents at -190 C are lower than drain currents at room temperature (20 C).

Patterson, Richard L.; Hammoud, Ahmad

2003-01-01

213

How to develop renewable power in China? A cost-effective perspective.  

PubMed

To address the problems of climate change and energy security, Chinese government strived to develop renewable power as an important alternative of conventional electricity. In this paper, the learning curve model is employed to describe the decreasing unit investment cost due to accumulated installed capacity; the technology diffusion model is used to analyze the potential of renewable power. Combined with the investment cost, the technology potential, and scenario analysis of China social development in the future, we develop the Renewable Power Optimization Model (RPOM) to analyze the optimal development paths of three sources of renewable power from 2009 to 2020 in a cost-effective way. Results show that (1) the optimal accumulated installed capacities of wind power, solar power, and biomass power will reach 169000, 20000, and 30000?MW in 2020; (2) the developments of renewable power show the intermittent feature; (3) the unit investment costs of wind power, solar power, and biomass power will be 4500, 11500, and 5700?Yuan/KW in 2020; (4) the discounting effect dominates the learning curve effect for solar and biomass powers; (5) the rise of on-grid ratio of renewable power will first promote the development of wind power and then solar power and biomass power. PMID:24578672

Cong, Rong-Gang; Shen, Shaochuan

2014-01-01

214

Development of lighting system for hologram using high power LEDs  

NASA Astrophysics Data System (ADS)

Light emitting diode (LED) became popular rapidly by the appearance of blue LED. Three color (R, G, B) emitting LEDs are utilized for the image display system by the development of multi color emitting LED. White LEDs became to commercial base by combining blue or UV light sources for excitation and materials for fluorescence. White LEDs are prevailing for general lighting applications. A single tip with the power of 5W became line up for commercial market owing to the research for high intensity LEDs. As a result, LEDs are replacing the market of conventional incandescent lighting and even head lights of the automobile. In this study, we aim to fabricate the white and R, G, B lighting system using high brightness LEDs for the lighting of holograms instead of a conventional halogen lamp.

Baba, Junko; Yaeda, Asami; Asakawa, Hisashi; Shibuya, Takehisa; Wakaki, Moriaki

2007-02-01

215

Preliminary design development of 100 KW rotary power transfer device  

NASA Technical Reports Server (NTRS)

Contactless power transfer devices for transferring electrical power across a rotating spacecraft interface were studied. A power level of 100 KW was of primary interest and the study was limited to alternating current devices. Rotary transformers and rotary capacitors together with the required dc to ac power conditioning electronics were examined. Microwave devices were addressed. The rotary transformer with resonant circuit power conditioning was selected as the most feasible approach. The rotary capacitor would be larger while microwave devices would be less efficient. A design analysis was made of a 100 KW, 20 kHz power transfer device consisting of a rotary transformer, power conditioning electronics, drive mechanism and heat rejection system. The size, weight and efficiency of the device were determined. The characteristics of a baseline slip ring were presented. Aspects of testing the 100 KW power transfer device were examined. The power transfer device is a feasible concept which can be implemented using presently available technologies.

Weinberger, S. M.

1981-01-01

216

Development of an Organic Rankine-Cycle power module for a small community solar thermal power experiment  

NASA Technical Reports Server (NTRS)

An organic Rankine-cycle (ORC) power module was developed for use in a multimodule solar power plant to be built and operated in a small community. Many successful components and subsystems, including the reciever, power conversion subsystem, energy transport subsystem, and control subsystem, were tested. Tests were performed on a complete power module using a test bed concentrator in place of the proposed concentrator. All major single-module program functional objectives were met and the multimodule operation presented no apparent problems. The hermetically sealed, self-contained, ORC power conversion unit subsequently successfully completed a 300-hour endurance run with no evidence of wear or operating problems.

Kiceniuk, T.

1985-01-01

217

Multi-kilowatt modularized spacecraft power processing system development  

NASA Technical Reports Server (NTRS)

A review of existing information pertaining to spacecraft power processing systems and equipment was accomplished with a view towards applicability to the modularization of multi-kilowatt power processors. Power requirements for future spacecraft were determined from the NASA mission model-shuttle systems payload data study which provided the limits for modular power equipment capabilities. Three power processing systems were compared to evaluation criteria to select the system best suited for modularity. The shunt regulated direct energy transfer system was selected by this analysis for a conceptual design effort which produced equipment specifications, schematics, envelope drawings, and power module configurations.

Andrews, R. E.; Hayden, J. H.; Hedges, R. T.; Rehmann, D. W.

1975-01-01

218

Bi-directional four quadrant (BDQ4) power converter development  

NASA Technical Reports Server (NTRS)

The feasibility for implementation of a concept for direct ac/dc multikilowatt power conversion with bidirectional transfer of energy was investigated. A 10 kHz current carrier was derived directly from a common 60 Hz three phase power system. This carrier was modulated to remove the 360 Hz ripple, inherent in the three phase power supply and then demodulated and processed by a high frequency filter. The resulting dc power was then supplied to a load. The process was implemented without the use of low frequency transformers and filters. This power conversion processes was reversible and can operate in the four quadrants as viewed from any of the two of the converter's ports. Areas of application include: power systems on air and spacecraft; terrestrial traction; integration of solar and wind powered systems with utility networks; HVDC; asynchronous coupling of polyphase networks; heat treatment; industrial machine drives; and power supplies for any use including instrumentation.

Schwarz, F. C.

1979-01-01

219

Development of an externally powered prosthetic hook for amputees  

NASA Technical Reports Server (NTRS)

The powered hook with trigger finger appears to be a useful adaptation of a terminal device for an amputee when performing vocational activities involving the use of a powered tool requiring a trigger control. The proportional control system includes transducers and amplifiers and appears to have widespread application for control of any external power, whether it be in the orthotic or prosthetic field.

Karchak, A., Jr.; Allen, J. R.; Bontrager, E. L.

1973-01-01

220

Development and Commercialization of the Lunar Solar Power System  

Microsoft Academic Search

The proposed Lunar Solar Power (LSP) System consists of pairs of power bases located on opposite limbs of the Moon as seen from Earth. The power bases collect the solar energy and convert it to beams of microwaves. The microwaves are delivered directly to moonward-facing receivers on Earth or indirectly through relay satellites in orbit about Earth (1, 2, 3,

D. R. Criswell

2002-01-01

221

Development of a fuel cell power conditioner system  

Microsoft Academic Search

The fuel cell is an alternative power generation method which is envisaged to be environmentally friendly and efficient. It can be an attractive solution for various “clean power” applications such as an electric vehicle. It can also be suitably used as a stand alone power generator. The fuel cell converts chemical energy into electrical energy by means of an electrochemical

K. M. Salim; Zainal Salam; Faridah Taha; A. H. M. Yatim

1999-01-01

222

Courseware development for a laboratory class in power electronics  

E-print Network

This thesis introduces a new lab kit that is uniquely suited to teach power electronics: the Power NerdKit. The Power NerdKit is a self-contained prototyping system, which is easily incorporated into other systems such as ...

Alvira, Mariano

2005-01-01

223

Power Systems Development Facility. Quarterly report, July--September 1995  

SciTech Connect

The objective of this project is to evaluate hot gas particle control technologies using coal-derived gas streams. This will entail the design, construction, installation, and use of a flexible test facility which can operate under realistic gasification and combustion conditions. The major particulate control device issues to be addressed include the integration of the particulate control devices into coal utilization systems, on-line cleaning techniques, chemical and thermal degradation of components, fatigue or structural failures, blinding, collection efficiency as a fimction of particle size, and scale-up of particulate control systems to commercial size. The conceptual design of the facility was extended to include a within scope, phased expansion of the existing Hot Gas Cleanup Test Facility Cooperative Agreement to also address systems integration issues of hot particulate removal in advanced coal-based power generation systems. This expansion included the consideration of the following modules at the test facility in addition to the original Transport Reactor gas source and hot gas cleanup units: carbonizer/pressurized circulating fluidized bed gas source; hot gas cleanup units to mate to all gas streams; combustion gas turbine; and fuel cell and associated gas treatment. This expansion to the Hot Gas Cleanup Test Facility is herein referred to as the Power Systems Development Facility (PSDF). The major emphasis during this reporting period was continuing the detailed design of the facility towards completion and integrating the balance-of-plant processes and particulate control devices (PCDS) into the structural and process designs. Substantial progress in construction activities was achieved during the quarter. Delivery and construction of the process structural steel is nearing completion. Nearly all equipment are set in its place and the FW equipment and the PCDs are being set in the structure.

NONE

1995-11-01

224

Power Systems Development Facility Gasification Test Run TC07  

SciTech Connect

This report discusses Test Campaign TC07 of the Kellogg Brown & Root, Inc. (KBR) Transport Reactor train with a Siemens Westinghouse Power Corporation (Siemens Westinghouse) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The Transport Reactor is an advanced circulating fluidized-bed reactor designed to operate as either a combustor or a gasifier using a particulate control device (PCD). The Transport Reactor was operated as a pressurized gasifier during TC07. Prior to TC07, the Transport Reactor was modified to allow operations as an oxygen-blown gasifier. Test Run TC07 was started on December 11, 2001, and the sand circulation tests (TC07A) were completed on December 14, 2001. The coal-feed tests (TC07B-D) were started on January 17, 2002 and completed on April 5, 2002. Due to operational difficulties with the reactor, the unit was taken offline several times. The reactor temperature was varied between 1,700 and 1,780 F at pressures from 200 to 240 psig. In TC07, 679 hours of solid circulation and 442 hours of coal feed, 398 hours with PRB coal and 44 hours with coal from the Calumet mine, and 33 hours of coke breeze feed were attained. Reactor operations were problematic due to instrumentation problems in the LMZ resulting in much higher than desired operating temperatures in the reactor. Both reactor and PCD operations were stable and the modifications to the lower part of the gasifier performed well while testing the gasifier with PRB coal feed.

Southern Company Services

2002-04-05

225

Power Systems Development Facility Gasification Test Run TC08  

SciTech Connect

This report discusses Test Campaign TC08 of the Kellogg Brown & Root, Inc. (KBR) Transport Gasifier train with a Siemens Westinghouse Power Corporation (Siemens Westinghouse) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The Transport Gasifier is an advanced circulating fluidized-bed gasifier designed to operate as either a combustor or a gasifier in air- or oxygen-blown mode using a particulate control device (PCD). The Transport Gasifier was operated as a pressurized gasifier in air- and oxygen-blown modes during TC08. Test Run TC08 was started on June 9, 2002 and completed on June 29. Both gasifier and PCD operations were stable during the test run with a stable baseline pressure drop. The oxygen feed supply system worked well and the transition from air to oxygen blown was smooth. The gasifier temperature was varied between 1,710 and 1,770 F at pressures from 125 to 240 psig. The gasifier operates at lower pressure during oxygen-blown mode due to the supply pressure of the oxygen system. In TC08, 476 hours of solid circulation and 364 hours of coal feed were attained with 153 hours of pure oxygen feed. The gasifier and PCD operations were stable in both enriched air and 100 percent oxygen blown modes. The oxygen concentration was slowly increased during the first transition to full oxygen-blown operations. Subsequent transitions from air to oxygen blown could be completed in less than 15 minutes. Oxygen-blown operations produced the highest synthesis gas heating value to date, with a projected synthesis gas heating value averaging 175 Btu/scf. Carbon conversions averaged 93 percent, slightly lower than carbon conversions achieved during air-blown gasification.

Southern Company Services

2002-06-30

226

ALL FOR ONE AND ONE FOR ALL? THE DEVELOPMENT AND TRANSFER OF POWER ACROSS ORGANIZATIONAL LEVELS  

Microsoft Academic Search

Power in organizations is a fluid social construction subject to multiple interpreta- tions. The extensive literature on power provides insights about the antecedents and consequences of power at the individual and group levels but does not provide a model tracing the linkages between them and describing how power develops and is transferred between individuals and groups. In this article we

C. MARLENE FIOL; EDWARD J. O'CONNOR; HERMAN AGUINIS

2001-01-01

227

The introduction of space technology power systems into developing countries  

NASA Technical Reports Server (NTRS)

Between 1978 and 1984, NASA-Lewis was responsible for the design, fabrication, installation and operational support of 57 photovoltaic power systems in 27 countries. These systems were installed in locations not served by a central power system and ranged in size from 40 W for powering street lights to 29 kW for providing power to a complete village. Several of the system projects had socio/economic studies components that provided for an assessment of how the introduction of both electricity and a novel high technology power system affected the users and their society.

Roberts, Allen F.; Ratajczak, Anthony F.

1989-01-01

228

The Potential for a Nuclear Renaissance: The Development of Nuclear Power Under Climate Change Mitigation Policies  

E-print Network

The Potential for a Nuclear Renaissance: The Development of Nuclear Power Under Climate Change and Policy Program #12;#12;The Potential for a Nuclear Renaissance: The Development of Nuclear Power Under the Earth's climate, and will continue to change it for centuries if no action is taken. Nuclear power

229

Development of 350 MHz quarter wave coaxial resonator for power coupler testing  

Microsoft Academic Search

High Power Coaxial RF Couplers (50 kW, CW, 350 MHz) with inductive coupling are presently under development at NPD, BARC. These couplers require high power conditioning for their successful operation. A compact coaxial resonator has been designed and developed. Low power prototype has been tested and tuned to the desired frequency with good agreement between CST Microwave simulations and measurement

R. Kumar; G. N. Singh; P. Singh

2009-01-01

230

26 OUR PLANET GENERATING POWER, JOBS AND DEVELOPMENTS AndrewBrookes/Corbis  

E-print Network

26 OUR PLANET GENERATING POWER, JOBS AND DEVELOPMENTS ©AndrewBrookes/Corbis #12;Retooling economic growth and job creation. It will be up to the incoming president to marshal public and industry by Daniel M. Kammen OUR PLANET GENERATING POWER, JOBS AND DEVELOPMENTS 27 #12;28 OUR PLANET GENERATING POWER

Kammen, Daniel M.

231

High power gas laser - Applications and future developments  

NASA Technical Reports Server (NTRS)

Fast flow can be used to create the population inversion required for lasing action, or can be used to improve laser operation, for example by the removal of waste heat. It is pointed out that at the present time all lasers which are capable of continuous high-average power employ flow as an indispensable aspect of operation. High power laser systems are discussed, taking into account the gasdynamic laser, the HF supersonic diffusion laser, and electric discharge lasers. Aerodynamics and high power lasers are considered, giving attention to flow effects in high-power gas lasers, aerodynamic windows and beam manipulation, and the Venus machine. Applications of high-power laser technology reported are related to laser material working, the employment of the laser in controlled fusion machines, laser isotope separation and photochemistry, and laser power transmission.

Hertzberg, A.

1977-01-01

232

Recent Developments in Optimal Power Flow Modeling Techniques  

Microsoft Academic Search

\\u000a This article discusses recent advances in mathematical modeling techniques of transmission networks and control devices within\\u000a the scope of optimal power flow (OPF) implementations. Emphasis is on the newly proposed concept of representing meshed power\\u000a networks using an extended conic quadratic (ECQ) model and its amenability to solution by using interior-point codes. Modeling\\u000a of both classical power control devices and

Rabih A. Jabr

233

Power-scavenging Tumbleweed Rover Design, development, and testing of a Tumbleweed rover capable of generating  

E-print Network

Power-scavenging Tumbleweed Rover Design, development, and testing of a Tumbleweed rover capable University of Toronto Copyright c 2010 by Goran Jurisa Basic #12;Abstract Power-scavenging Tumbleweed Rover

Sislian, J. P.

234

Power Systems Development Facility Gasification Test Run TC10  

SciTech Connect

This report discusses Test Campaign TC10 of the Kellogg Brown & Root, Inc. (KBR) Transport Gasifier train with a Siemens Westinghouse Power Corporation (Siemens Westinghouse) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The Transport Gasifier is an advanced circulating fluidized-bed gasifier designed to operate as either a combustor or a gasifier in air- or oxygen-blown mode of operation using a particulate control device (PCD). The Transport Gasifier was operated as a pressurized gasifier during TC10 in air- (mainly for transitions and problematic operations) and oxygen-blown mode. Test Run TC10 was started on November 16, 2002, and completed on December 18, 2002. During oxygen-blown operations, gasifier temperatures varied between 1,675 and 1,825 F at pressures from 150 to 180 psig. After initial adjustments were made to reduce the feed rate, operations with the new fluidized coal feeder were stable with about half of the total coalfeed rate through the new feeder. However, the new fluidized-bed coal feeder proved to be difficult to control at low feed rates. Later the coal mills and original coal feeder experienced difficulties due to a high moisture content in the coal from heavy rains. Additional operational difficulties were experienced when several of the pressure sensing taps in the gasifier plugged. As the run progressed, modifications to the mills (to address processing the wet coal) resulted in a much larger feed size. This eventually resulted in the accumulation of large particles in the circulating solids causing operational instabilities in the standpipe and loop seal. Despite problems with the coal mills, coal feeder, pressure tap nozzles and the standpipe, the gasifier did experience short periods of stability during oxygenblown operations. During these periods, the syngas quality was high. During TC10, the gasifier gasified over 609 tons of Powder River Basin subbituminous coal and accumulated a total of 416 hours of coal feed, over 293 hours of which were in oxygen-blown operation. No sorbent was used during the run.

Southern Company Services

2002-12-30

235

Development of oxygen transport membranes for coal-based power generation  

Microsoft Academic Search

Praxair is developing an Advanced Zero Emission Coal Fired Power Plant (Advanced Power Cycle) that enables carbon capture and sequestration (CCS) at a “levelized” cost of electricity below the U.S. Department of Energy’s target for CO2 capture from coal fired power plants. The power cycle utilizes a gasifier, partial oxidation units, power recovery turbines and an oxygen fired boiler to

Lee Rosen; Nick Degenstein; Minish Shah; Jamie Wilson; Sean Kelly; John Peck; Max Christie

2011-01-01

236

Integrated Micro-Power System (IMPS) Development at NASA Glenn Research Center  

NASA Technical Reports Server (NTRS)

Glenn Research Center (GRC) has a long history of energy related technology developments for large space related power systems, including photovoltaics, thermo-mechanical energy conversion, electrochemical energy storage. mechanical energy storage, power management and distribution and power system design. Recently, many of these technologies have begun to be adapted for small, distributed power system applications or Integrated Micro-Power Systems (IMPS). This paper will describe the IMPS component and system demonstration efforts to date.

Wilt, David; Hepp, Aloysius; Moran, Matt; Jenkins, Phillip; Scheiman, David; Raffaelle, Ryne

2003-01-01

237

Photovoltaic power conditioning subsystem: state of the art and development opportunities  

SciTech Connect

Photovoltaic sytems, the state of the art of power conditioning subsystem components, and the design and operational interaction between photovoltaic systems and hot utilities are detailed in this document. Major technical issues relating to the design and development of power conditioning systems for photovoltaic application are also considered, including: (1) standards, guidelines, and specifications; (2) cost-effective hardware design; (3) impact of advanced components on power conditioning development; (4) protection and safety; (5) quality of power; (6) system efficiency; and (7) system integration with the host utility. In addition, theories of harmonic distortion and reactive power flow are discussed, and information about power conditioner hardware and manufacturers is provided.

Krauthamer, S.; Bahrami, K.; Das, R.; Macie, T.; Rippel, W.

1984-01-15

238

Photovoltaic power conditioning subsystem: State of the art and development opportunities  

NASA Technical Reports Server (NTRS)

Photovoltaic systems, the state of the art of power conditioning subsystem components, and the design and operational interaction between photovoltaic systems and host utilities are detailed in this document. Major technical issues relating to the design and development of power conditioning systems for photovoltaic application are considered; these include: (1) standards, guidelines, and specifications; (2) cost effective hardware design; (3) impact of advanced components on power conditioning development; (4) protection and safety; (5) quality of power; (6) system efficiency; and (7) system integration with the host utility. Theories of harmonic distortion and reactive power flow are discussed, and information about power conditioner hardware and manufacturers is provided.

Krauthamer, S.; Bahrami, K.; Das, R.; Macie, T.; Rippel, W.

1984-01-01

239

Development and experimental characterization of a fuel cell powered aircraft  

Microsoft Academic Search

This paper describes the characteristics and performance of a fuel cell powered unmanned aircraft. The aircraft is novel as it is the largest compressed hydrogen fuel cell powered airplane built to date and is currently the only fuel cell aircraft whose design and test results are in the public domain. The aircraft features a 500W polymer electrolyte membrane fuel cell

Thomas H. Bradley; Blake A. Moffitt; Dimitri N. Mavris; David E. Parekh

2007-01-01

240

Development of thermodynamic cycles for concentrated solar power plants  

Microsoft Academic Search

Solar thermal power is a promising ‘green’ technology that could contribute significantly – in countries where it may be applicable due to available resources – towards meeting the 2020 and 2050 targets for the free energy production of emissions [Viebahn, P., Lechon, Y., and Trieb, F., 2011. The potential role of concentrated solar power (CSP) in Africa and Europe –

A. J. Kolios; S. Paganini; S. Proia

2012-01-01

241

Development of a novel power transmission line inspection robot  

Microsoft Academic Search

A mobile robot based on novel line-walking mechanism is proposed for inspecting power transmission lines. The novel mechanism enables the centroid of the robot to concentrate on the hip joint to minimize the drive torque of the hip joint and keep the robot stable when only on leg is hung on line. After reviewing of the line-walking mechanism, power line

Ludan Wang; Fei Liu; Zhen Wang; Shaoqiang Xu; Sheng Cheng; Jianwei Zhang

2010-01-01

242

The Development of Power Technologies for Low-Grade Coal  

NASA Astrophysics Data System (ADS)

Beneficiation of Indian coal and operation of power plants with imported coal will improve the efficiency of power generation to some extent but they will not satisfy overall future requirements of pollution control and conservation of energy. Therefore, there is a need to adopt new clean coal technologies.

Basu, K.

243

Toshiba's developments on construction techniques of nuclear power plants  

Microsoft Academic Search

Reliable and economic energy supplies are fundamental requirements of energy policies in Japan. To accomplish these needs, nuclear power plants are being increased in Japan. In recent years, construction cost increases and schedule extensions have affected the capital cost of nuclear energy, compared with fossil power plants, due to lower costs of oil and coal. On the other hand, several

Y. Hayashi; N. Itoh

1987-01-01

244

Heat engine development for solar thermal power systems  

Microsoft Academic Search

The parabolic dish solar collector systems for converting sunlight to electrical power through a heat engine will, require a small heat engine of high performance long lifetime to be competitive with conventional power systems. The most promising engine candidates are Stirling, high temperature Brayton, and combined cycle. Engines available in the current market today do not meet these requirements. The

H. Q. Pham; L. D. Jaffe

1981-01-01

245

Development of molten carbonate fuel cell power plant technology  

NASA Astrophysics Data System (ADS)

This report summarizes the work performed to develop and verify the design of a prototype molten carbonate fuel cell stack which meets the requirements of a 1990's-competitive, coal-fired, electrical utility central station, or industrial cogeneration power plant. Fabrication of the cell components to be used in the 100-cell stack was completed successfully. Compressive creep of the anode to be used in the 100-cell stack was measured through 720 hours of testing at 1300(0)F. The data continue to support the creep resistance of this component. Anode and bubble barrier pore spectra data obtained after aging at 1300F confirmed the sintering resistance of these components. A parametric study of candidate separator material data obtained from retort corrosion tests was completed. Based on the study, cell testing of treated INCO 825 was begun. A 1000 hour cell test of Ni-201/316SS at accelerated test conditions showed no failure of this separator plate material. Single cell tests to evaluate Co-based and Ti-based alternate cathode materials were conducted. The cell test performance data and post test chemical analysis show both materials are unstable. Cell testing of a doped Fe-based cathode showed a reaction with the matrix used. A repeat test using a different matrix material is planned. Testing of the 20-cell Subscale Stack was completed on schedule following 2000 hours of operation. A post test analysis was begun in order to correlate the diagnostic test data with the physical evidence of component stability, including electrolyte containment.

1985-10-01

246

Development of an expert system for power quality advisement using CLIPS 6.0  

NASA Technical Reports Server (NTRS)

Proliferation of power electronic devices has brought in its wake both deterioration in and demand for quality power supply from the utilities. The power quality problems become apparent when the user's equipment or systems maloperate or fail. Since power quality concerns arise from a wide variety of sources and the problem fixes are better achieved from the expertise of field engineers, development of an expert system for power quality advisement seems to be a very attractive and cost-effective solution for utility applications. An expert system thus developed gives an understanding of the adverse effects of power quality related problems on the system and could help in finding remedial solutions. The paper reports the design of a power quality advisement expert system being developed using CLIPS 6.0. A brief outline of the power quality concerns is first presented. A description of the knowledge base is next given and details of actual implementation include screen output from the program.

Chandrasekaran, A.; Sarma, P. R. R.; Sundaram, Ashok

1994-01-01

247

Development and analysis for core power gamma thermometer adaptation  

SciTech Connect

The gamma thermometer (GT) has gained increasing interest to replace the local power range monitor (LPRM) and the traversing in-core probe (TIP) as the core monitoring device in new boiling water reactor (BWR) designs. The number of GTs is designed between the number of LPRMs, 4, and the number of TIPs, 24, per string, but its optimal number is yet to be determined. The authors have modified the BWR core Simulator PANACEA for analyzing the core power GT adaptation and have compared the axial core-averaged relative power distributions and two thermal limits of the GT 8- and 12-point adaptations against those of the TIP 24-point adaptation.

Ren-Tai Chiang; Leong, T. [General Electric Co., San Jose, CA (United States)

1996-12-31

248

Plasma Imaging and Spectroscopy Diagnostics Developed on 100500-kA Pulsed Power Devices  

E-print Network

Plasma Imaging and Spectroscopy Diagnostics Developed on 100­500-kA Pulsed Power Devices DANIEL B discuss the development of high-resolution plasma imaging and spectroscopy diagnostics for the soft X-ray and ultraviolet en- ergy ranges developed and used on 100­500 kA pulsed power facil- ities. Requiring just a few

249

Research issues in developing compact pulsed power for high peak power applications on mobile platforms  

Microsoft Academic Search

Pulsed power is a technology that is suited to drive electrical loads requiring very large power pulses in short bursts (high-peak power). Certain applications require technology that can be deployed in small spaces under stressful environments, e.g., on a ship, vehicle, or aircraft. In 2001, the U.S. Department of Defense (DoD) launched a long-range (five-year) Multidisciplinary University Research Initiative (MURI)

JOHN A. GAUDET; ROBERT J. BARKER; C. JERALD BUCHENAUER; CHRISTOS CHRISTODOULOU; JAMES DICKENS; MARTIN A. GUNDERSEN; RAVINDA P. JOSHI; HERMANN G. KROMPHOLZ; JUERGEN F. KOLB; ANDRÁS KUTHI; MOUNIR LAROUSSI; ANDREAS NEUBER; WILLIAM NUNNALLY; EDL SCHAMILOGLU; KARL H. SCHOENBACH; J. SCOTT TYO; ROBERT J. VIDMAR

2004-01-01

250

New Developments in High-Frequency Power Sources  

Microsoft Academic Search

The induction heating industry has recently introduced a new high-frequency power source, the static frequency converter. The converter uses solid-state low-loss thyristors to guide currents to the induction heating load generating high-frequency power at high efficiency. Unlike the conventional motor generator, the output frequency of the static converter is variable, being self-controlled from the induction heating load. It follows the

William E. Frank

1970-01-01

251

Development of Power-head based Fan Airflow Station  

E-print Network

the basic theory, experiment and results of the power-head based airflow station. Theory Figure 1 shows variable speed fan connection schematic. VFD is normally installed on the motor to adjust the motor speed by modulating frequency. Typically... if the motor and fan efficiency is known. fan fanmotormotor fan fanfan H W H W Q ??? ?? = ? = (2) Based on the motor theory, the motor efficiency is the function of the motor power. )( 1 motormotor Wf=? (3) Typically the motor efficiency can...

Wang, G.; Liu, M.

2005-01-01

252

The development of electromechanical batteries for power system support and for sthort-term standby power  

Microsoft Academic Search

The slow move from a fossil-fuel powered society to a renewable-energy powered society is creating and will continue to create a demand for good energy storage techniques. The electromechanical battery (EMB), comprising a flywheel energy storage system with electrical input and output, is one of the many candidate technologies. Two different EMB types are evaluated in this present project. The

Michael Peter OLeary

1997-01-01

253

DEVELOPING PULSE WIDTH MODULATED POWER SUPPLY FOR THE GeV LIGHT SOURCE  

E-print Network

the magnet and a fixed dc voltage source. The power converter could be made of power transistorsLS-69 DEVELOPING PULSE WIDTH MODULATED POWER SUPPLY FOR THE GeV LIGHT SOURCE by Dr. Muhammad H CONTROLLERS 3.1 Transistorized Two-Quadrant Chopper Control 3.2 3.3 Resonant Inverter With Controlled

Kemner, Ken

254

Airworthiness criteria development for powered-lift aircraft: A program summary  

NASA Technical Reports Server (NTRS)

A four-year simulation program to develop airworthiness criteria for powered-lift aircraft is summarized. All flight phases affected by use of powered lift (approach, landing, takeoff) are treated with regard to airworthiness problem areas (limiting flight conditions and safety margins: stability, control, and performance; and systems failure). The general features of powered-lift aircraft are compared to conventional aircraft.

Heffley, R. K.; Stapleford, R. L.; Rumold, R. C.

1977-01-01

255

Development of a 10 kWe solar thermal power station  

Microsoft Academic Search

Small solar power plants with thermal and electrical power storage systems are a viable solution for well-insolated developing countries - such as Egypt and India - situated within the tropical zone. The design concept of a 10-kWe solar thermal power plant employing two separate closed thermal cycles is discussed, with special emphasis on the working fluid in the Rankine cycle.

H. Hopmann; K. Berndorfer; P. Vinz

1976-01-01

256

The development of a solar thermal water purification, heating, and power generation system: A case study.  

E-print Network

The development of a solar thermal water purification, heating, and power generation system: A case, none of the existing concentrated solar power systems (trough, dish, and tower) that have been the potential of an invention directed to a water purification system that also recovers power from generated

Wu, Mingshen

257

Development of a test bed for high-speed power line communications  

Microsoft Academic Search

This paper presents the development of a power line test bed which provides a platform to simulate the 230 V power line environment in a controlled and reproducible manner. The target is to communicate data reliably over power lines at speeds of at least 1 Mbits\\/s with frequency ranging from 1 MHz to 10 MHz. This test bed is integrated

C. K. Lim; P. L. So; E. Gunawan; S. Chen; T. T. Lie; Y. L. Guan

2000-01-01

258

The Development of High Performance FFT IP Cores through Hybrid Low Power Algorithmic Methodology  

E-print Network

The Development of High Performance FFT IP Cores through Hybrid Low Power Algorithmic Methodology on parallel-pipelined architectures for high throughput and power efficient FFT IP cores. Low power of the above techniques for 64-point 4-parallel-pipelined FFT and 16-point 2-parallel-pipelined FFT

Arslan, Tughrul

259

Development of Jet Noise Power Spectral Laws Using SHJAR Data  

NASA Technical Reports Server (NTRS)

High quality jet noise spectral data measured at the Aeroacoustic Propulsion Laboratory at the NASA Glenn Research Center is used to examine a number of jet noise scaling laws. Configurations considered in the present study consist of convergent and convergent-divergent axisymmetric nozzles. Following the work of Viswanathan, velocity power factors are estimated using a least squares fit on spectral power density as a function of jet temperature and observer angle. The regression parameters are scrutinized for their uncertainty within the desired confidence margins. As an immediate application of the velocity power laws, spectral density in supersonic jets are decomposed into their respective components attributed to the jet mixing noise and broadband shock associated noise. Subsequent application of the least squares method on the shock power intensity shows that the latter also scales with some power of the shock parameter. A modified shock parameter is defined in order to reduce the dependency of the regression factors on the nozzle design point within the uncertainty margins of the least squares method.

Khavaran, Abbas; Bridges, James

2009-01-01

260

Power  

NASA Technical Reports Server (NTRS)

The space station requires an increase in power or energy of at least several orders of magnitude compared to previous space missions. With the requirement up in the range of 10 kilowatt hours, this obviiously requires the development of new technology. Although the power area is very well integrated in the spacecraft itself, it represents a diverse set of components necessary for energy conversion, electronics, and energy distribution. Considerable work is ongoing at NASA Lewis in the power devices development area, including transformers, large area solid-state chips, transistors, and fast recovery diodes. This work is oriented toward eventual application to both AC and DC power conversion approaches. In the energy storage area, there are many options available to fit into the space station representing various degrees of risk and leverage combination, such as the near-term integral-pressure-vessel nickel hydrogen battery, an advanced Ni-H2 battery concept, and the regenrative hydrogen-oxygen system utilizing essentially the Shuttle orbiter type of fuel cell.

Corbett, R.

1984-01-01

261

Development and testing of improved statistical wind power forecasting methods.  

SciTech Connect

Wind power forecasting (WPF) provides important inputs to power system operators and electricity market participants. It is therefore not surprising that WPF has attracted increasing interest within the electric power industry. In this report, we document our research on improving statistical WPF algorithms for point, uncertainty, and ramp forecasting. Below, we provide a brief introduction to the research presented in the following chapters. For a detailed overview of the state-of-the-art in wind power forecasting, we refer to [1]. Our related work on the application of WPF in operational decisions is documented in [2]. Point forecasts of wind power are highly dependent on the training criteria used in the statistical algorithms that are used to convert weather forecasts and observational data to a power forecast. In Chapter 2, we explore the application of information theoretic learning (ITL) as opposed to the classical minimum square error (MSE) criterion for point forecasting. In contrast to the MSE criterion, ITL criteria do not assume a Gaussian distribution of the forecasting errors. We investigate to what extent ITL criteria yield better results. In addition, we analyze time-adaptive training algorithms and how they enable WPF algorithms to cope with non-stationary data and, thus, to adapt to new situations without requiring additional offline training of the model. We test the new point forecasting algorithms on two wind farms located in the U.S. Midwest. Although there have been advancements in deterministic WPF, a single-valued forecast cannot provide information on the dispersion of observations around the predicted value. We argue that it is essential to generate, together with (or as an alternative to) point forecasts, a representation of the wind power uncertainty. Wind power uncertainty representation can take the form of probabilistic forecasts (e.g., probability density function, quantiles), risk indices (e.g., prediction risk index) or scenarios (with spatial and/or temporal dependence). Statistical approaches to uncertainty forecasting basically consist of estimating the uncertainty based on observed forecasting errors. Quantile regression (QR) is currently a commonly used approach in uncertainty forecasting. In Chapter 3, we propose new statistical approaches to the uncertainty estimation problem by employing kernel density forecast (KDF) methods. We use two estimators in both offline and time-adaptive modes, namely, the Nadaraya-Watson (NW) and Quantilecopula (QC) estimators. We conduct detailed tests of the new approaches using QR as a benchmark. One of the major issues in wind power generation are sudden and large changes of wind power output over a short period of time, namely ramping events. In Chapter 4, we perform a comparative study of existing definitions and methodologies for ramp forecasting. We also introduce a new probabilistic method for ramp event detection. The method starts with a stochastic algorithm that generates wind power scenarios, which are passed through a high-pass filter for ramp detection and estimation of the likelihood of ramp events to happen. The report is organized as follows: Chapter 2 presents the results of the application of ITL training criteria to deterministic WPF; Chapter 3 reports the study on probabilistic WPF, including new contributions to wind power uncertainty forecasting; Chapter 4 presents a new method to predict and visualize ramp events, comparing it with state-of-the-art methodologies; Chapter 5 briefly summarizes the main findings and contributions of this report.

Mendes, J.; Bessa, R.J.; Keko, H.; Sumaili, J.; Miranda, V.; Ferreira, C.; Gama, J.; Botterud, A.; Zhou, Z.; Wang, J. (Decision and Information Sciences); (INESC Porto)

2011-12-06

262

Hydrothermal industrialization electric-power systems development. Final report  

SciTech Connect

The nature of hydrothermal resources, their associated temperatures, geographic locations, and developable capacity are described. The parties involved in development, required activities and phases of development, regulatory and permitting requirements, environmental considerations, and time required to complete development activities ae examined in detail. These activities are put in proper perspective by detailing development costs. A profile of the geothermal industry is presented by detailing the participants and their operating characteristics. The current development status of geothermal energy in the US is detailed. The work on market penetration is summarized briefly. Detailed development information is presented for 56 high temperature sites. (MHR)

Not Available

1982-03-01

263

Development of a lithium hydride powered hydrogen generator for use in long life, low power PEM fuel cell power supplies  

E-print Network

This thesis studies a hybrid PEM fuel cell system for use in low power, long life sensor networks. PEM fuel cells offer high efficiency and environmental friendliness but have not been widely adopted due to cost, reliability, ...

Strawser, Daniel DeWitt

2012-01-01

264

A Power Consumption Analysis Technique Using UML-Based Design Models in Embedded Software Development  

Microsoft Academic Search

\\u000a Although the power consumption of embedded system depends on the operation of hardware devices, software behaviors give great\\u000a effect to the power consumption because of its functionality and complexity growth. This paper proposes a power consumption\\u000a estimation technique using design models of software to support energy-efficient embedded software development. Even though\\u000a code-based power analysis techniques have been proposed, these techniques

Doo-Hwan Kim; Jong-Phil Kim; Jang-Eui Hong

2011-01-01

265

Space Solar Power Satellite Technology Development at the Glenn Research Center: An Overview  

NASA Technical Reports Server (NTRS)

NASA Glenn Research Center (GRC). is participating in the Space Solar Power Exploratory Research and Technology program (SERT) for the development of a solar power satellite concept. The aim of the program is to provide electrical power to Earth by converting the Sun's energy and beaming it to the surface. This paper will give an overall view of the technologies being pursued at GRC including thin film photovoltaics, solar dynamic power systems, space environmental effects, power management and distribution, and electric propulsion. The developmental path not only provides solutions to gigawatt sized space power systems for the future, but provides synergistic opportunities for contemporary space power architectures. More details of Space Solar Power can be found by reading the references sited in this paper and by connecting to the web site http://moonbase.msfc.nasa.gov/ and accessing the "Space Solar Power" section "Public Access" area.

Dudenhoefer, James E.; George, Patrick J.

2000-01-01

266

A Participatory Approach to Develop the Power Mobility Screening Tool and the Power Mobility Clinical Driving Assessment Tool  

PubMed Central

The electric powered wheelchair (EPW) is an indispensable assistive device that increases participation among individuals with disabilities. However, due to lack of standardized assessment tools, developing evidence based training protocols for EPW users to improve driving skills has been a challenge. In this study, we adopt the principles of participatory research and employ qualitative methods to develop the Power Mobility Screening Tool (PMST) and Power Mobility Clinical Driving Assessment (PMCDA). Qualitative data from professional experts and expert EPW users who participated in a focus group and a discussion forum were used to establish content validity of the PMCDA and the PMST. These tools collectively could assess a user's current level of bodily function and their current EPW driving capacity. Further multicenter studies are necessary to evaluate the psychometric properties of these tests and develop EPW driving training protocols based on these assessment tools. PMID:25276796

Kamaraj, Deepan C.; Dicianno, Brad E.; Cooper, Rory A.

2014-01-01

267

Incorporating endogenous demand dynamics into long-term capacity expansion power system models for Developing countries  

E-print Network

This research develops a novel approach to long-term power system capacity expansion planning for developing countries by incorporating endogenous demand dynamics resulting from social processes of technology adoption. ...

Jordan, Rhonda LeNai

2013-01-01

268

Development of a photovoltaic power supply for wireless sensor networks.  

SciTech Connect

This report examines the design process of a photovoltaic (solar) based power supply for wireless sensor networks. Such a system stores the energy produced by an array of photovoltaic cells in a secondary (rechargeable) battery that in turn provides power to the individual node of the sensor network. The goal of such a power supply is to enable a wireless sensor network to have an autonomous operation on the order of years. Ideally, such a system is as small as possible physically while transferring the maximum amount of available solar energy to the load (the node). Within this report, there is first an overview of current solar and battery technologies, including characteristics of different technologies and their impact on overall system design. Second is a general discussion of modeling, predicting, and analyzing the extended operation of a small photovoltaic power supply and setting design parameters. This is followed by results and conclusions from the testing of a few basic systems. Lastly, some advanced concepts that may be considered in order to optimize future systems will be discussed.

Harvey, Matthew R.; Kyker, Ronald D.

2005-06-01

269

Why did the solar power sector develop quickly in Japan?  

E-print Network

The solar power sector grew quickly in Japan during the decade 1994 to 2003. During this period, annual installations increased 32-fold from 7MW in 1994 to 223MW in 2003, and annual production increased 22-fold, from 16MW ...

Rogol, Michael G

2007-01-01

270

Biomass power for rural development. Revised design report.  

SciTech Connect

The retrofit of Dunkirk Steam Station to fire biomass fuels is an important part of the Consortium's goal--demonstrating the viability of commercial scale willow energy crop production and conversion to power. The goal for th biomass facilities at Dunkirk is to reliably cofire a combination of wood wastes and willow biomass with coal at approximately 20% by heat input.

Neuhauser, Edward

1999-10-03

271

Development of plastic heat exchangers for sea solar power plants  

Microsoft Academic Search

Conceptual designs of heat exchangers for the sea solar power plant using lost cost plastic surfaces are evaluated. Composite walls of conductive, filled high density polyethylene and multilayered thin films of impermeable plastics are used as the reference material. Plate surfaces using thin falling films for evaporation and condensation of ammonia are identified as the least expensive concept. Horizontal tubular

W. B. Suratt; G. K. Hart; E. N. Sieder

1975-01-01

272

Competition and alliances in fuel cell power train development  

Microsoft Academic Search

For the realisation of the effective application and cost effectiveness of fuel cell power trains, and competitiveness with the current internal combustion engine technology, it will be necessary to either: (a) produce a large number of vehicles, (b) reduce the production costs by permanent production optimisation, or (c) introduce new materials.Learning curves, which have been derived from empirical data of

Ludmilla Schlecht

2003-01-01

273

DEVELOPMENT OF ULTRASONIC TESTING TECHNIQUE TO INSPECT CONTAINMENT LINERS EMBEDDED IN CONCRETE ON NUCLEAR POWER PLANTS  

Microsoft Academic Search

The purpose of this study is development of ultrasonic testing technique to inspect containment liners embedded in concrete on nuclear power plants. Integrity of containment liners on nuclear power plants can be secured by suitable present operation and maintenance. Furthermore, non-destructive testing technique to inspect embedded liners will ensure the integrity of the containment further. In order to develop the

H. Ishida; Y. Kurozumi; Y. Kaneshima

274

Training for Rural Development: Harnessing the power of community groups Collett, K.L.  

E-print Network

readily adapted and successful adaptations shared. There is research that supports the value of groupsTraining for Rural Development: Harnessing the power of community groups Collett, K.L. ISDA 2010, Montpellier 28-30 June 2010 TRAINING FOR RURAL DEVELOPMENT HARNESSING THE POWER OF COMMUNITY GROUPS Kathleen

Boyer, Edmond

275

Innovation Approaches to Development and Ground Testing of Advanced Bimodal Space Power and Propulsion Systems  

Microsoft Academic Search

The last major development effort for nuclear power and propulsion systems ended in 1993. Currently, there is not an initiative at either the National Aeronautical and Space Administration (NASA) or the U.S. Department of Energy (DOE) that requires the development of new nuclear power and propulsion systems. Studies continue to show nuclear technology as a strong technical candidate to lead

Thomas Johnathan Hill; Cheryl Ann Noble; J. Martinell; S. Borowski

2000-01-01

276

The 40-kw field test power plant modification and development, phase 2  

NASA Technical Reports Server (NTRS)

Progression on the design and development of a 40 KW fuel cell system for on-site installation for providing both thermal and electrical power is reported. Development of the steam reformer fuel processor, power section, inverter, control system, and thermal management and water treatment systems is described.

1980-01-01

277

Combustion technology developments in power generation in response to environmental challenges  

E-print Network

Combustion technology developments in power generation in response to environmental challenges J Abstract Combustion system development in power generation is discussed ranging from the pre-environmental era in which the objectives were complete combustion with a minimum of excess air and the capability

Kammen, Daniel M.

278

Development and Testing of a Prototype Grid-Tied Photovoltaic Power System  

NASA Technical Reports Server (NTRS)

The NASA Glenn Research Center (GRC) has developed and tested a prototype 2 kW DC grid-tied photovoltaic (PV) power system at the Center. The PV system has generated in excess of 6700 kWh since operation commenced in July 2006. The PV system is providing power to the GRC grid for use by all. Operation of the prototype PV system has been completely trouble free. A grid-tied PV power system is connected directly to the utility distribution grid. Facility power can be obtained from the utility system as normal. The PV system is synchronized with the utility system to provide power for the facility, and excess power is provided to the utility. The project transfers space technology to terrestrial use via nontraditional partners. GRC personnel glean valuable experience with PV power systems that are directly applicable to various space power systems, and provide valuable space program test data. PV power systems help to reduce harmful emissions and reduce the Nation s dependence on fossil fuels. Power generated by the PV system reduces the GRC utility demand, and the surplus power aids the community. Present global energy concerns reinforce the need for the development of alternative energy systems. Modern PV panels are readily available, reliable, efficient, and economical with a life expectancy of at least 25 years. Modern electronics has been the enabling technology behind grid-tied power systems, making them safe, reliable, efficient, and economical with a life expectancy of at least 25 years. Based upon the success of the prototype PV system, additional PV power system expansion at GRC is under consideration. The prototype grid-tied PV power system was successfully designed and developed which served to validate the basic principles described, and the theoretical work that was performed. The report concludes that grid-tied photovoltaic power systems are reliable, maintenance free, long life power systems, and are of significant value to NASA and the community.

Eichenberg, Dennis J.

2009-01-01

279

Particle fuel development for solid core space nuclear power  

SciTech Connect

Advanced nuclear fuel development has been spurred by the space exploration initiative (SEI) to develop fuels that support lunar and Mars missions. Fuel performance requirements have been derived from preliminary mission requirements for nuclear thermal and nuclear electric propulsion. The strategy for development of advanced fuels is to develop fuels for high-temperatures which effectively also enhances fuels for terrestrial or nuclear electric propulsion by limiting the diffusion rates at operating temperature and lengthens the operating time at lower temperatures. Development of high-temperature fuels based on a cryochemical process is discussed.

Olsen, C.S. (EG G Idaho, Inc., P.O. Box 1625, Idaho Falls, Idaho (USA))

1991-01-10

280

Development of RF MEMS Switches for High Power Applications  

Microsoft Academic Search

This paper introduces a new concept in RF MEMS switches intended for high RF signal power applications at millimetre-wave operation. The novel SPST switch architecture employs electrothermal hydraulic microactuators. Out-of-plane silicon levers, having spring action and latching mechanisms, have been designed to create an OFF-state gap separation distance of 250 ?m between ohmic contact electrodes. Having simple assembly, many of

Joo-Young Choi; Jun-Su Lee; Stepan Lucyszyn

281

Prospects for the power sector in nine developing countries  

SciTech Connect

Based on information drawn primarily from official planning documents issued by national governments and/or utilities, the authors examined the outlook for the power sector in the year 2000 in nine countries: China, India, Indonesia, Thailand, the Philippines, South Korea, Taiwan, Argentina and Mexico. They found that the implicit rates of average annual growth of installed electric power capacity between 1991 and 2001 range from a low of 3.3% per year in Argentina to a high of 13.2% per year in Indonesia. In absolute terms, China and India account for the vast majority of the growth. The plans call for a shift in the generating mix towards coal in six of the countries, and continued strong reliance on coal in China and India. The use of natural gas is expected to increase substantially in a number of the countries. The historic movement away from oil continues, although some countries are maintaining dual-fuel capabilities. Plans call for considerable growth of nuclear power in South Korea and China and modest increases in India and Taiwan. The feasibility of the official plans varies among the countries. Lack of public capital is leading towards greater reliance on private sector participation in power projects in many of the countries. Environmental issues are becoming a more significant constraint than in the past, particularly in the case of large-scale hydropower projects. The financial and environmental constraints are leading to a rising interest in methods of improving the efficiency of electricity supply and end use. The scale of such activities is growing in most of the study countries.

Meyers, S.; Goldman, N.; Martin, N.; Friedmann, R.

1993-04-01

282

CCMR: Development of a High Power Membraneless Fuel Cell  

NSDL National Science Digital Library

Fuel cells can convert the chemical energy from an electrochemical reaction into electrical energy. Typically, hydrogen gas/oxygen gas fuel cells have a proton exchange membrane (PEM) that keeps the fuel and oxidant from mixing and allows protons to travel from the anode surface to the cathode surface. By establishing laminar flow, the Abruña group has been able to eliminate the need for a PEM in a micro fuel cell. Data obtained by running 150mM NaBH4 in 3M NaOH (fuel) and 0.5 M Ce(NH4)2(NO3)6 in 1M HNO3 (oxidant) through these membraneless micro fuel cells indicate that they have much higher power density than most direct methanol fuel cells and use much less fuel. Recently, a scaled up version of these micro fuel cells was built. If this scaled up membraneless fuel cell can be successfully assembled and run using the same fuel and oxidant, then previously obtained performance data indicates that enough power should be generated to power an iPod Nano. It will also indicate that the design is scalable and is commercially practical.

Watts, David J.

2009-08-15

283

Concept Developed for an Implanted Stimulated Muscle-Powered Piezoelectric Generator  

NASA Technical Reports Server (NTRS)

Implanted electronic devices are typically powered by batteries or transcutaneous power transmission. Batteries must be replaced or recharged, and transcutaneous power sources burden the patient or subject with external equipment prone to failure. A completely self-sustaining implanted power source would alleviate these limitations. Skeletal muscle provides an available autologous power source containing native chemical energy that produces power in excess of the requirements for muscle activation by motor nerve stimulation. A concept has been developed to convert stimulated skeletal muscle power into electrical energy (see the preceding illustration). We propose to connect a piezoelectric generator between a muscle tendon and bone. Electrically stimulated muscle contractions would exert force on the piezoelectric generator, charging a storage circuit that would be used to power the stimulator and other devices.

Lewandowski, Beth; Kilgore, Kevin; Ercegovic, David; Gustafson, Kenneth

2005-01-01

284

Development of vertical multijunction solar cells for spacecraft primary power  

Microsoft Academic Search

During the first half of this program to develop the vertical multijunction solar cell, new silicon technologies were developed so that three types of 2000 junction per cm packing density, vertical multijunction solar cells can be made. The new technologies include: (1) large area electron beam pattern generation, (2) orientation dependent etching, (3) epitaxial silicon refill of deep grooves, and

R. K. Smeltzer; R. F. Hotz; P. Shah

1974-01-01

285

Response of Rocky Mountain elk (Cervus elaphus) to wind-power development  

USGS Publications Warehouse

Wind-power development is occurring throughout North America, but its effects on mammals are largely unexplored. Our objective was to determine response (i.e., home-range, diet quality) of Rocky Mountain elk (Cervus elaphus) to wind-power development in southwestern Oklahoma. Ten elk were radiocollared in an area of wind-power development on 31 March 2003 and were relocated bi-weekly through March 2005. Wind-power construction was initiated on 1 June 2003 and was completed by December 2003 with 45 active turbines. The largest composite home range sizes (>80 km2) occurred April-June and September, regardless of the status of wind-power facility development. The smallest home range sizes (<50 km2) typically occurred in October-February when elk aggregated to forage on winter wheat. No elk left the study site during the study and elk freely crossed the gravel roads used to access the wind-power facility. Carbon and nitrogen isotopes and percent nitrogen in feces suggested that wind-power development did not affect nutrition of elk during construction. Although disturbance and loss of some grassland habitat was apparent, elk were not adversely affected by wind-power development as determined by home range and dietary quality.

Walter, W.D.; Leslie, D.M., Jr.; Jenks, J.A.

2006-01-01

286

Synergistic Catalysis: A Powerful Synthetic Strategy for New Reaction Development  

PubMed Central

Synergistic catalysis is a synthetic strategy wherein both the nucleophile and the electrophile are simultaneously activated by two separate and distinct catalysts to afford a single chemical transformation. This powerful catalysis strategy leads to several benefits, specifically synergistic catalysis can (i) introduce new, previously unattainable chemical transformations, (ii) improve the efficiency of existing transformations, and (iii) create or improve catalytic enantioselectivity where stereocontrol was previously absent or challenging. This perspective aims to highlight these benefits using many of the successful examples of synergistic catalysis found in the literature. PMID:22518271

Allen, Anna E.; MacMillan, David W. C.

2012-01-01

287

Development of High Average Power Lasers for the Photon Collider  

SciTech Connect

The laser and optics system for the photon collider seeks to minimize the required laser power by using an optical stacking cavity to recirculate the laser light. An enhancement of between 300 to 400 is desired. In order to achieve this the laser pulses which drive the cavity must precisely match the phase of the pulse circulating within the cavity. We report on simulations of the performance of a stacking cavity to various variations of the drive laser in order to specify the required tolerances of the laser system.

Gronberg, Jeff; /LLNL, Livermore; Stuart, Brent; /LLNL, Livermore; Seryi, Andrei; /SLAC

2012-07-05

288

Activity and accomplishments of dish/Stirling electric power system development  

NASA Technical Reports Server (NTRS)

The development of the solar parabolic-dish/Stirling-engine electricity generating plant known as the dish/Stirling electric power system is described. The dish/Stirling electric power system converts sunlight to electricity more efficiently than any known existing solar electric power system. The fabrication and characterization of the test bed concentrators that were used for Stirling module testing and of the development of parabolic dish concentrator No. 2, an advanced solar concentrator unit considered for use with the Stirling power conversion unit is discussed.

Livingston, F. R.

1985-01-01

289

Development of a digital turbine control system in a nuclear power plant  

Microsoft Academic Search

A digital turbine control system (TCS) has been developed for retrofitting an old analog TCS in a nuclear power plant. The\\u000a developed TCS, which controls the speed of a turbine and the power load of a generator, is based on a triple modular redundant\\u000a structure to ensure the system reliability. In addition, a turbine simulator has been developed to verify

In-Kyu Choi; Jong-An Kim; Chang-Ki Jeong; Joo-Hee Woo; Ji-Young Choi; Gihun Son

2009-01-01

290

DEVELOPMENT OF HTS CONDUCTORS FOR ELECTRIC POWER APPLICATIONS  

SciTech Connect

Second generation (2G) technologies to fabricate high-performance superconducting wires developed at the Oak Ridge National Laboratory (ORNL) were transferred to American Superconductor via this CRADA. In addition, co-development of technologies for over a decade was done to enable fabrication of commercial high-temperature superconducting (HTS) wires with high performance. The massive success of this CRADA has allowed American Superconductor Corporation (AMSC) to become a global leader in the fabrication of HTS wire and the technology is fully based on the Rolling Assisted Biaxially Textured Substrates (RABiTS) technology invented and developed at ORNL.

Goyal, A.; Rupich, M. (American Superconductor Corp.)

2012-10-23

291

Factors driving wind power development in the United States  

SciTech Connect

In the United States, there has been substantial recent growth in wind energy generating capacity, with growth averaging 24 percent annually during the past five years. About 1,700 MW of wind energy capacity was installed in 2001, while another 410 MW became operational in 2002. This year (2003) shows promise of significant growth with more than 1,500 MW planned. With this growth, an increasing number of states are experiencing investment in wind energy projects. Wind installations currently exist in about half of all U.S. states. This paper explores the key factors at play in the states that have achieved a substantial amount of wind energy investment. Some of the factors that are examined include policy drivers, such as renewable portfolio standards (RPS), federal and state financial incentives, and integrated resource planning; as well as market drivers, such as consumer demand for green power, natural gas price volatility, and wholesale market rules.

Bird, Lori A.; Parsons, Brian; Gagliano, Troy; Brown, Matthew H.; Wiser, Ryan H.; Bolinger, Mark

2003-05-15

292

Advanced Gas Turbine (AGT) power-train system development  

NASA Technical Reports Server (NTRS)

Technical work on the design and component testing of a 74.5 kW (100 hp) advanced automotive gas turbine is described. Selected component ceramic component design, and procurement were tested. Compressor tests of a modified rotor showed high speed performance improvement over previous rotor designs; efficiency improved by 2.5%, corrected flow by 4.6%, and pressure ratio by 11.6% at 100% speed. The aerodynamic design is completed for both the gasifier and power turbines. Ceramic (silicon carbide) gasifier rotors were spin tested to failure. Improving strengths is indicated by burst speeds and the group of five rotors failed at speeds between 104% and 116% of engine rated speed. The emission results from combustor testing showed NOx levels to be nearly one order of magnitude lower than with previous designs. A one piece ceramic exhaust duct/regenerator seal platform is designed with acceptable low stress levels.

Helms, H. E.; Johnson, R. A.; Gibson, R. K.

1982-01-01

293

Intellectual Property: a powerful tool to develop biotech research  

PubMed Central

Summary Today biotechnology is perhaps the most important technology field because of the strong health and food implications. However, due to the nature of said technology, there is the need of a huge amount of investments to sustain the experimentation costs. Consequently, investors aim to safeguard as much as possible their investments. Intellectual Property, and in particular patents, has been demonstrated to actually constitute a powerful tool to help them. Moreover, patents represent an extremely important means to disclose biotechnology inventions. Patentable biotechnology inventions involve products as nucleotide and amino acid sequences, microorganisms, processes or methods for modifying said products, uses for the manufacture of medicaments, etc. There are several ways to protect inventions, but all follow the three main patentability requirements: novelty, inventive step and industrial application. PMID:21255349

Giugni, Diego; Giugni, Valter

2010-01-01

294

Steam turbine development for advanced combined cycle power plants  

SciTech Connect

For advanced combined cycle power plants, the proper selection of steam turbine models is required to achieve optimal performance. The advancements in gas turbine technology must be followed by advances in the combined cycle steam turbine design. On the other hand, building low-cost gas turbines and steam turbines is desired which, however, can only be justified if no compromise is made in regard to their performance. The standard design concept of two-casing single-flow turbines seems to be the right choice for most of the present and future applications worldwide. Only for very specific applications it might be justified to select another design concept as a more suitable option.

Oeynhausen, H.; Bergmann, D. [Siemens KWU, Mulheim (Germany); Balling, L. [Siemens KWU, Erlangen (Germany); Termuehlen, H. [Siemens Power Corp., Milwaukee, WI (United States)

1996-12-31

295

Development of High Average Power Lasers for the Photon Collider  

SciTech Connect

The laser and optics system for the photon collider seeks to minimize the required laser power by using an optical stacking cavity to recirculate the laser light. An enhancement of between 300 to 400 is desired. In order to achieve this the laser pulses which drive the cavity must precisely match the phase of the pulse circulating within the cavity. We report on simulations of the performance of a stacking cavity to various variations of the drive laser in order to specify the required tolerances of the laser system. We look at the behavior of a simple four mirror cavity as shown in Fig. 1. As a unit input pulse is applied to the coupling mirror a pulse begins to build up in the interior of the cavity. If the drive pulses and the interior pulse arrive at the coupling mirror in phase the interior pulse will build up to a larger value. The achievable enhancement is a strong function of the reflectivity of the cavities. The best performance if attained when the reflectivities of the input coupler is matched to the internal reflectivities of the cavity. In Fig. 2 we show the build up of the internal pulse after a certain number of drive pulses, assuming the input coupler has a reflectivity of 0.996 and the interior mirrors have 0.998 reflectivity. With these parameters the cavity will reach an enhancement factor of 450. Reducing the coupler reflectivity gives a faster cavity loading rate but with a reduced enhancement of the internal pulse. The enhancement as a function of coupler reflectivity and total internal cavity reflectivity is shown in Fig. 3. The best enhancement is achieved when the coupling mirror is matched to the reflectivity of the cavity. A coupler reflectivity just below the internal cavity reflectivity minimizes the required laser power.

Gronberg, J; Stuart, B; Seryi, A

2010-05-17

296

Satellite power system: Concept development and evaluation program. Volume 3: Power transmission and reception. Technical summary and assessment  

NASA Technical Reports Server (NTRS)

Efforts in the DOE/NASA concept development and evaluation program are discussed for the solar power satellite power transmission and reception system. A technical summary is provided together with a summary of system assessment activities. System options and system definition drivers are described. Major system assessment activities were in support of the reference system definition, solid state system studies, critical technology supporting investigations, and various system and subsystem tradeoffs. These activities are described together with reference system updates and alternative concepts for each of the subsystem areas. Conclusions reached as a result of the numerous analytical and experimental evaluations are presented. Remaining issues for a possible follow-on program are identified.

Dietz, R. H.; Arndt, G. D.; Seyl, J. W.; Leopold, L.; Kelley, J. S.

1981-01-01

297

Engineering development of superconducting RF linac for high-power applications  

SciTech Connect

High-power proton linacs are a promising source of neutrons for material processing and research applications. Superconducting radiofrequency (SCRF) Rf linac technology is preferred for such applications because of power efficiency. A multi-year engineering development program is underway at Los Alamos National Laboratory to demonstrate the required SCRF technology. The program consists of development of SC cavities, power couplers, and cryomodule integration. Prototypes will be built and operated to obtain performance and integration information, and for design improvement. This paper describes the scope and present status of the development program.

Dominic Chan, K.C.; Rusnak, B.; Gentzlinger, R.C.; Campbell, B.M.; Kelley, J.P. [Los Alamos National Lab., NM (United States); Safa, H. [CEA Saclay (France)

1998-12-31

298

Development of a power control system for AUVs probing for underwater mineral resources  

NASA Astrophysics Data System (ADS)

Valuable mineral resources are widely distributed throughout the seabed. autonomous underwater vehicles (AUVs) are preferable to remotely-operated vehicles (ROVs) when probing for such mineral resources as the extensive exploration area makes it difficult to maintain contact with operators. AUVs depend on batteries, so their power consumption should be reduced to extend exploration time. Power for conventional marine instrument systems is incorporated in their waterproof sealing. External intermittent control of this power source until termination of exploration is challenging due to limitations imposed by the underwater environment. Thus, the AUV must have a power control system that can improve performance and maximize use of battery capacity. The authors developed such a power control system with a three-step algorithm. It automatically detects underwater operational states and can limit power, effectively decreasing power consumption by about 15%.

Kim, Young Jin; Kim, Hyung Tae; Cho, Young June; Lee, Kang Won

2009-12-01

299

Materials advances to enhance development of geothermal power  

SciTech Connect

In order to assure the continued development of geothermal resources, many advances in materials technology are required so that high costs resulting from the severe environments encountered during drilling, well completion and energy extraction can be reduced. These needs will become more acute as higher temperature and chemically aggressive fluids are encountered. High priority needs are for lost circulation control and lightweight well completion materials, and tools such as drill pipe protectors, rotating head seals, blow-out preventers, and downhole drill motors. The lack of suitable hydrolytically stable chemical systems that can bond previously developed elastomers to metal reinforcement is a critical but as yet unaddressed impediment to the development of these tools. In addition, the availability of low cost corrosion and scale-resistant tubular lining materials would greatly enhance transport and energy extraction processes utilizing hypersaline brines. Work to address these materials needs is underway at Brookhaven National Laboratory (BNL), and recent accomplishments are summarized in the paper. 15 refs.

Kukacka, L.E.

1989-03-01

300

Materials Advances to Enhance Development of Geothermal Power  

SciTech Connect

In order to assure the continued development of geothermal resources, many advances in materials technology are required so that high costs resulting from the severe environments encountered during drilling, well completion and energy extraction can be reduced. These needs will become more acute as higher temperature and chemically aggressive fluids are encountered. High priority needs are for lost circulation control and lightweight well completion materials, and tools such as drill pipe protectors, rotating head seals, blow-out preventers, and downhole drill motors. The lack of suitable hydrolytically stable chemical systems that can bond previously developed elastomers to metal reinforcement is a critical but as yet unaddressed impediment to the development of these tools. In addition, the availability of low cost corrosion and scale-resistant tubular lining materials would greatly enhance transport and energy extraction processes utilizing hypersaline brines. Work to address these materials needs is underway at Brookhaven National Laboratory (BNL), and recent accomplishments are summarized in the paper.

Kukacka, Lawrence E.

1989-03-21

301

Development of a high frequency Stirling engine-powered 3 kW(e) generator set  

Microsoft Academic Search

The development of a Stirling engine-powered, 3 kW electric generator set is discussed. The generator set contains two high-frequency (115 Hz), helium-charged, free-piston Stirling engines mounted in an opposed configuration and heated by gas-fired sodium heat pipe, a power conditioner, an adaptive load controller, and the engine cooling system. The maximum power from a single engine, at this stage of

D. M. Berchowitz; D. Shade; A. Karandikar

1989-01-01

302

Development of Low-Speed Low-Capacity Vertical-Axis-Type Wind Power Generator  

NASA Astrophysics Data System (ADS)

We have developed a low-speed and low-capacity wind power generator. In this paper, we introduce the outline of the 5kW multi-polar synchronous generator that generates the electric power efficiently from 50rpm to 180rpm. The generator is produced by a magnetic powder core for cost reduction. We also express the outline and field test results of the low-capacity power plant constructed in Ohmura City, Nagasaki.

Soejima, Katsunori; Higuchi, Tsuyoshi; Abe, Takashi; Hirayama, Tadashi; Kouno, Katsuiti

303

Geothermal power development in Hawaii. Volume I. Review and analysis  

SciTech Connect

The history of geothermal exploration in Hawaii is reviewed briefly. The nature and occurrences of geothermal resources are presented island by island. An overview of geothermal markets is presented. Other topies covered are: potential markets of the identified geothermal areas, well drilling technology, hydrothermal fluid transport, overland and submarine electrical transmission, community aspects of geothermal development, legal and policy issues associated with mineral and land ownership, logistics and infrastructure, legislation and permitting, land use controls, Regulation 8, Public Utilities Commission, political climate and environment, state plans, county plans, geothermal development risks, and business planning guidelines.

Not Available

1982-06-01

304

Advanced on-site power plant development technology program  

NASA Technical Reports Server (NTRS)

A 30-cell stack was tested for 7200 hours. At 6000 hours the stack was successfully refilled with acid with no loss of performance. A second stack containing the advanced Configuration B cell package was fabricated and assembled for testing in 1985. A 200-kW brassboard inverter was successfully evaluated, verifying the design of the two-bridge ASCR circuit design. A fuel processing catalyst train was tested for 2000 hours verifying the catalyst for use in a 200-kW development reformer. The development reformer was fabricated for evaluation in 1985. The initial test plan was prepared for a 200-kW verification test article.

Kemp, F. S.

1985-01-01

305

Toward the last frontier - A strategy for the evolutionary development of space nuclear power systems  

NASA Technical Reports Server (NTRS)

A number of exciting mission opportunities are being considered for the 21st century, including advanced robotic science missions to the outer planets and beyond, human exploration of the Moon and Mars, and advanced space transportation systems. All of these missions will require some form of nuclear power; however, it is clear that current budgetary constraints preclude developing many different types of space nuclear power systems. This paper reviews the specific civil space missions which have been identified, the power levels and lifetimes required, and the technologies available. From this an evolutionary space nuclear power program is developed which builds upon the experience of radioisotope thermoelectric generators, dynamic isotope power systems, and space nuclear reactors. It is strongly suggested that not only does this approach make technical and budgetary sense but that it is consistent with the normal development of new technologies.

Bennett, Gary L.

1992-01-01

306

Development of a Power Transformer Terminal Transient Model  

Microsoft Academic Search

In this paper the importance of transformer transient models is discussed and the different transformer transient models are classified. The existing terminal transformer transient models are introduced briefly. Two important transformer transient models are reviewed; the multi-winding transformer terminal transient model from name plate information and a frequency dependent transformer transient model. The methods of development of these two models

Mohammad Hadi Vakilian; Toan B. Phung

307

Development Theory and Communication Policy: Power to the People!  

Microsoft Academic Search

Most scholars agree that thinking about communication and development as a distinct discipline emerged after World War II, and they usually point out two paradigms: `modernization' versus `dependency'. In this article a new perspective is perceived in terms of a new paradigm, defined as `multiplicity in one world'. It is argued that these three paradigms imply quite divergent communication policy

Jan Servaes

1986-01-01

308

Development of partial oxidizer/reformer for PAFC power plants  

NASA Astrophysics Data System (ADS)

The development of a methanol partial oxidation reformer designed to provide hydrogen to a 3 kW Phosphoric Acid Fuel Cell Powerplant is discussed. The partial oxidation reformer operates on neat methanol and utilizes the fuel cell cathode exhaust stream as the oxidant.

Christner, L. G.; Steinfeld, G.

1985-11-01

309

Water and human development: capabilities, entitlements and power  

Microsoft Academic Search

Water and sanitation are key aspects of human development. For poor people, access to water and sanitation is a pre-requisite to achieving a minimum standard of health and to undertake productive activities. Moreover, water plays a key role enhancing agricultural and industrial productivity. Human freedom and access to water and sanitation go hand in hand. Without adequate, safe and affordable

Lyla Mehta

2006-01-01

310

The development of 4 m HTS power cable  

Microsoft Academic Search

Superconducting cables offer the advantages of lower loss, lighter weight and smaller dimensions, as compared to conventional cables. A 4 m, 2 kA, AC, HTS cable system was developed for the purpose of study. The cable conductor was made of Bi-2223 tapes. A space maintained as a vacuum between two corrugated stainless steel tubes functions as a cryostat surrounding the

Bo Hou; Haixia Xi; Feng Yuan; Yong Zhang; Ying Xin; Yanfang Bi; Songtao Wu; Huaikuang Ding; Jing Shi

2004-01-01

311

"The Power of Mantras": Postcoloniality, Education and Development  

ERIC Educational Resources Information Center

The discourse of development or modernization and of "national integration" or "nation-building" in India is inseparable from issues surrounding education and culture and their incorporation in definitions forged during colonialism. In this article I look primarily at the Kothari Commission Report (KCR) of 1964-66 and the New Policy on Education…

Poddar, Prem

2006-01-01

312

The Power of Planning Developing Effective Read-Alouds  

ERIC Educational Resources Information Center

In the midst of many circle times, one can overhear small voices adding to the words from the book being read aloud by the teacher. Sometimes the children's words relate to the text, sometimes not. Early childhood educators recognize the importance of reading aloud every day to develop children's language and early literacy skills. Recommendations…

Shedd, Meagan K.; Duke, Nell K.

2008-01-01

313

EE 581 Power Systems Admittance Matrix: Development, Direct and Iterative  

E-print Network

of calculations, admittance is used (Y) Ohm's Law: V=IR Complex: V=IZ = 1 = (Siemens) is symmetric Equations Development: Models can be solved using either nodal (bus) analysis or port analysis Nodal analysis much easier to use than loop equations Nodal analysis used by computer programs For ease

Wedeward, Kevin

314

Advanced PEFC development for fuel cell powered vehicles  

NASA Astrophysics Data System (ADS)

Vehicles equipped with fuel cells have been developed with much progress. Outcomes of such development efforts include a Toyota fuel cell electric vehicle (FCEV) using hydrogen as the fuel which was developed and introduced in 1996, followed by another Toyota FCEV using methanol as the fuel, developed and introduced in 1997. In those Toyota FCEVs, a fuel cell system is installed under the floor of each RAV4L, to sports utility vehicle. It has been found that the CO concentration in the reformed gas of methanol reformer can be reduced to 100 ppm in wide ranges of catalyst temperature and gas flow rate, by using the ruthenium (Ru) catalyst as the CO selective oxidizer, instead of the platinum (Pt) catalyst known from some time ago. It has been also found that a fuel cell performance equivalent to that with pure hydrogen can be ensured even in the reformed gas with the carbon monoxide (CO) concentration of 100 ppm, by using the Pt-Ru (platinum ruthenium alloy) electrocatalyst as the anode electrocatalyst of a polymer electrolyte fuel cell (PEFC), instead of the Pt electrocatalyst known from some time ago.

Kawatsu, Shigeyuki

315

The power of the 3? UTR: translational control and development  

Microsoft Academic Search

Many crucial decisions, such as the location and timing of cell division, cell-fate determination, and embryonic axes establishment, are made in the early embryo, a time in development when there is often little or no transcription. For this reason, the control of variation in gene expression in the early embryo often relies on post-transcriptional control of maternal genes. Although the

Scott Kuersten; Elizabeth B. Goodwin

2003-01-01

316

TOPAZ-2'' thermionic space nuclear power system and the perspectives of its development  

SciTech Connect

This paper describes characteristics of the TOPAZ Reactors for space power applications developed in the USSR. TOPAZ-2 has been shown to be useful for satellites and for lunar or Martian bases. It can be coupled with a Stirling engine. TOPAZ-3 reactor provides greater power levels while TOPAZ-4 has an improved multicell thermionic fuel element. (AIP)

Nickitin, V.P.; Ogloblin, B.G.; Luppov, A.N. (Central Design Berau of Mechanical Engineering, Leningrad, USSR (SU)); Usov, V.A. (Kurchatov Institute of Atomic Energy, Moscow, (USSR)) Nicolaev, Y.V. (Scientific-Industrial Association Luch'', Podolsk, (USSR)) Wetch, J.R. (Space Power Inc., San Jose, CA (USA))

1991-01-05

317

Software development with computer graphics, distributed data base and OOP for deregulated power systems analysis  

Microsoft Academic Search

In this paper is reported the software development for power systems analysis using several techniques combining the object oriented programming paradigm, computer graphics techniques, distributed data base and software engineering. Three software packages have been implemented: CAPS, SIGVNS and TREINOM. CAPS package is oriented for interactive analysis of power systems and electric markets. SIGVNS is intended for calculation of the

V. L. Paucar; I. O. Almeida; M. J. Rider; M. F. Bedrinana; J. H. Santos

2004-01-01

318

The World Bank, Support for Universities, and Asymmetrical Power Relations in International Development  

ERIC Educational Resources Information Center

This article examines the role of the World Bank in advancing higher education sectors in the developing world, considering in particular the increasing power and strength of a global knowledge-based economy. Given the powerful role that intergovernmental organizations such as the World Bank play in shaping global economic policies, the authors…

Collins, Christopher S.; Rhoads, Robert A.

2010-01-01

319

Development of thermoelectric power generation system utilizing heat of combustible solid waste  

Microsoft Academic Search

The paper presents the development of thermoelectric power generation system utilizing heat of municipal solid waste. The systematic classification and design guideline are proposed in consideration of the characteristics of solid waste processing system. The conceptual design of thermoelectric power generation system is carried out for a typical middle scale incinerator system (200 ton\\/day) by the local model. Totally the

Takenobu Kajikawa; Makoto Ito; Izumi Katsube; Eiichi Shibuya

1994-01-01

320

Alkali metal space power technology applicable to national energy research and development  

Microsoft Academic Search

The nation's space power program developed an alkali metal technology potentially applicable to its future energy needs. The space power system was designed to utilize a nuclear reactor with a primary lithium loop and a secondary boiling\\/condensing potassium loop driving a potassium vapor turbine\\/electrical generator. Considerable design, manufacture, test, and evaluation efforts were expended in the successful demonstration of the

W. F. Zimmerman

1977-01-01

321

Battery power comparison to charge medical devices in developing countries  

Microsoft Academic Search

Many people in developing countries cannot afford or rely on certain modes of electricity. We establish the reasonability of relying on lead-acid batteries, 9 V alkaline batteries, and lithium-ion batteries for charging low-voltage medical equipment. Based on the research and tests we conducted, we determined that using these battery types to charge medical devices truly is a reasonable solution.

Alesia M. Casanova; Andrew S. Bray; Taylor A. Powers; Amit J. Nimunkar; John G. Webster

2009-01-01

322

Photovoltaic power systems for rural areas of developing countries  

NASA Technical Reports Server (NTRS)

Systems technology, reliability, and present and projected costs of photovoltaic systems are discussed using data derived from NASA, Lewis Research Center experience with photovoltaic systems deployed with a variety of users. Operating systems in two villages, one in Upper Volta and the other in southwestern Arizona are described. Energy cost comparisons are presented for photovoltaic systems versus alternative energy sources. Based on present system technology, reliability, and costs, photovoltaics provides a realistic energy option for developing nations.

Rosenblum, L.; Bifano, W. J.; Hein, G. F.; Ratajczak, A. F.

1979-01-01

323

Evaluating the level and nature of sustainable development for a geothermal power plant  

Microsoft Academic Search

The paper provides for an evaluation of the potential level and nature of sustainable development of the Sabalan geothermal power plant in NW Iran, to be operational in 2011. The paper achieves this by applying a mathematical model of sustainable development developed by the author (re: Phillips [17,18]), in respect to the Environmental Impact Assessment (EIA) conducted by Yousefi et

Jason Phillips

2010-01-01

324

75 FR 30852 - Hydroelectric Power Development at Ridgway Dam, Dallas Creek Project, Colorado  

Federal Register 2010, 2011, 2012, 2013, 2014

...DEPARTMENT OF THE INTERIOR Bureau of Reclamation Hydroelectric Power Development at Ridgway...Project, Colorado AGENCY: Bureau of Reclamation, Interior. ACTION: Notice of intent...water resource projects. The Bureau of Reclamation (Reclamation), in consultation...

2010-06-02

325

Pre-prototype 5 kW fuel cell power plant development  

NASA Astrophysics Data System (ADS)

A five kilowatt Phosphoric Acid Fuel Cell (PAFC) power plant, with the ability to operate on neat methanol, was developed and tested. Overall thermal efficiency at full load (based on the lower heating value of methanol) was 32 percent.

Abens, Sandors; Farooque, Mohammad

1987-04-01

326

Energy system development in Africa : the case of grid and off-grid power in Kenya  

E-print Network

This research used a combination of a grounded theory approach and system dynamics to study the electric power system in Kenya and to model the feedback at work in the development of the system. The ethnographic study ...

Steel, Katherine Deaton

2008-01-01

327

Development of high purity large forgings for nuclear power plants  

NASA Astrophysics Data System (ADS)

The recent increase in the size of energy plants has been supported by the development of manufacturing technology for high purity large forgings for the key components of the plant. To assure the reliability and performance of the large forgings, refining technology to make high purity steels, casting technology for gigantic ingots, forging technology to homogenize the material and consolidate porosity are essential, together with the required heat treatment and machining technologies. To meet these needs, the double degassing method to reduce impurities, multi-pouring methods to cast the gigantic ingots, vacuum carbon deoxidization, the warm forging process and related technologies have been developed and further improved. Furthermore, melting facilities including vacuum induction melting and electro slag re-melting furnaces have been installed. By using these technologies and equipment, large forgings have been manufactured and shipped to customers. These technologies have also been applied to the manufacture of austenitic steel vessel components of the fast breeder reactors and components for fusion experiments.

Tanaka, Yasuhiko; Sato, Ikuo

2011-10-01

328

Development of high energy density dielectrics for pulse power applications  

NASA Astrophysics Data System (ADS)

Pulsed power applications require large dielectrics (>10? diameter and ?0.125 thick) with high breakdown strength (BDS). The presence of porosity and increasing grain size lowers the BDS. Testing conditions such as sample thickness, electrode area, electrode design, and form of applied voltage (DC or pulsed) can also influence the BDS. The effect of electrode design is particularly important in that the design can induce local field enhancements and reduce the BDS during testing. The purpose of this study was to characterize the effects of such microstructural features and testing conditions on the BDS. TiO2 was chosen as the candidate material for BDS characterization studies and was fabricated using slip casting techniques. The BDS of TiO 2 decreased by a factor of 2--3 with increases in the thickness and electrode area due to the "weakest link" theory. The BDS also decreased with increasing amounts of porosity, but defects with sizes larger than pores seem to be also influencing the BDS at densities >95%. A breakdown mechanism was proposed consisting of gas discharge within a microstructural defect followed by electron avalanche. Field modeling showed field enhancements were induced at the triple points where, the surrounding medium, electrode, and dielectric all came into contact. Field enhancements factors (FEFs) were 1.74, 1.03, and 1.23 for the planar, dimpled, and edge radius electrode designs, respectively. Field modeling showed resistive gradients induced by donor doping TiO2 with Nb +5 would mitigate these field enhancements. Therefore, diffusion of Nb+5 was studied as a function of annealing time, temperature, and pO2 in both single crystal and polycrystalline TiO2. Diffusion was found to be about an order of magnitude faster in the (001) versus the (100) direction due to the open c-channels that exist in the rutile structure. Plots of log D versus log pO2 yielded slopes of 0.20--0.30, indicating that the diffusion of Nb+5 was associated with V''''Ti through the hopping of Nb+5 from one V''''Ti to another. Activation energies of 6.97 eV and 6.92 eV were found for diffusion in the (100) and (001), respectively. Grain boundary diffusion in polycrystalline TiO2 was three to four orders of magnitude higher than bulk diffusion with activation energies of 5.6 eV and 5.0 eV for grain sizes of 32 mum and 8 mum, respectively.

Gilmore, Brian Lawrence

329

Status of NASA's Advanced Radioisotope Power Conversion Technology Research and Development  

NASA Technical Reports Server (NTRS)

NASA s Advanced Radioisotope Power Systems (RPS) development program is funding the advancement of next generation power conversion technologies that will enable future missions that have requirements that can not be met by either the ubiquitous photovoltaic systems or by current Radioisotope Power Systems (RPS). Requirements of advanced radioisotope power systems include high efficiency and high specific power (watts/kilogram) in order to meet mission requirements with less radioisotope fuel and lower mass. Other Advanced RPS development goals include long-life, reliability, and scalability so that these systems can meet requirements for a variety of future space applications including continual operation surface missions, outer-planetary missions, and solar probe. This paper provides an update on the Radioisotope Power Conversion Technology Project which awarded ten Phase I contracts for research and development of a variety of power conversion technologies consisting of Brayton, Stirling, thermoelectrics, and thermophotovoltaics. Three of the contracts continue during the current Phase II in the areas of thermoelectric and Stirling power conversion. The accomplishments to date of the contractors, project plans, and status will be summarized.

Wong, Wayne A.; Anderson, David J.; Tuttle, Karen L.; Tew, Roy C.

2006-01-01

330

Work Began on Contracts for Radioisotope Power Conversion Technology Research and Development  

NASA Technical Reports Server (NTRS)

NASA has had a history of successful space flight missions that depended on radioisotope-fueled power systems. These Radioisotope Power Systems (RPSs) converted the heat generated from the decay of radioisotope material into useful electrical power. An RPS is most attractive in applications where photovoltaics are not optimal, such as deep-space applications where the solar flux is too low or extended applications on planets such as Mars where the day/night cycle, settling of dust, and life requirements limit the usefulness of photovoltaics. NASA s Radioisotope Power Conversion Technology (RPCT) Program is developing next-generation power-conversion technologies that will enable future missions that have requirements that cannot be met by the two RPS flight systems currently being developed by the Department of Energy for NASA: the Multi-Mission Radioisotope Thermoelectric Generator and the Stirling Radioisotope Generator (SRG).

Wong, Wayne A.

2005-01-01

331

High Power MPD Thruster Development at the NASA Glenn Research Center  

NASA Technical Reports Server (NTRS)

Propulsion requirements for large platform orbit raising, cargo and piloted planetary missions, and robotic deep space exploration have rekindled interest in the development and deployment of high power electromagnetic thrusters. Magnetoplasmadynamic (MPD) thrusters can effectively process megawatts of power over a broad range of specific impulse values to meet these diverse in-space propulsion requirements. As NASA's lead center for electric propulsion, the Glenn Research Center has established an MW-class pulsed thruster test facility and is refurbishing a high-power steady-state facility to design, build, and test efficient gas-fed MPD thrusters. A complimentary numerical modeling effort based on the robust MACH2 code provides a well-balanced program of numerical analysis and experimental validation leading to improved high power MPD thruster performance. This paper reviews the current and planned experimental facilities and numerical modeling capabilities at the Glenn Research Center and outlines program plans for the development of new, efficient high power MPD thrusters.

LaPointe, Michael R.; Mikellides, Pavlos G.; Reddy, Dhanireddy (Technical Monitor)

2001-01-01

332

The Design and Development of the SMEX-Lite Power System  

NASA Technical Reports Server (NTRS)

This paper describes the design and development of a 250W orbit average electrical power system electronic Power Node and software for use in Low Earth Orbit missions. The mass of the Power Node is 3.6 Kg (8 lb.). The dimensions of the Power Node are 30cm x 26cm x 7.9cm (11 in. x 10.25 in x 3.1 in.) The design was realized using software, Field Programmable Gate Array (FPGA) digital logic and surface mount technology. The design is generic enough to reduce the non-recurring engineering for different mission configurations. The Power Node charges one to five, low cost, 22-cell 4 AH D-cell battery packs independently. The battery charging algorithms are executed in the power software to reduce the mass and size of the power electronic. The Power Node implements a peak-power tracking algorithm using an innovative hardware/software approach. The power software task is hosted on the spacecraft processor. The power software task generates a MIL-STD-1553 command packet to update the Power Node control settings. The settings for the battery voltage and current limits, as well as minimum solar array voltage used to implement peak power tracking are contained in this packet. Several advanced topologies are used in the Power Node. These include synchronous rectification in the bus regulators, average current control in the battery chargers and quasi-resonant converters for the Field Effect Transistor (FET) transistor drive electronics. Lastly, the main bus regulator uses a feed-forward topology with the PWM implemented in an FPGA.

Rakow, Glenn P.; Schnurr, Richard G., Jr.; Solly, Michael A.

1998-01-01

333

Power for all? Electricity and uneven development in North Carolina  

NASA Astrophysics Data System (ADS)

Many towns in eastern North Carolina face a number of challenges common to the rural South, including high rates of poverty and diminishing employment opportunities. However, some residents of this region also confront a unique hardship---electricity prices that are vastly higher than those of surrounding areas. This dissertation examines the origins of pricing inequalities in the electricity market of eastern North Carolina---namely how such inequalities developed and their role in the production of racial and economic disparities in the South. This dissertation examines the evolving relations between federal and state agencies, corporations, and electric utilities, and asks why these interactions produced varying social outcomes across different places and spatial settings. The research focuses on the origins and subsequent development of electric utilities in eastern North Carolina, and examines how electricity as a material technology interacted with geographies of race and class, as well as the dictates of capital accumulation. This approach enables a rethinking of several concepts that are rarely examined by scholars of electric utilities, most notably the monopoly service territory, which I argue served as a spatial fix to accumulation problems in the industry. Further, examining the way that electric utilities developed in North Carolina during the 20th century brings to the forefront the at times contradictory relationships among systems of electricity provision, Jim Crow segregation, the Progressive Era, and the New Deal. Such a focus highlights the important role that the control of electricity provision played in shaping racial inequalities that continue to persist in the region. With most urban areas were electrified in the 1930s, the research also traces the electricity distribution lines as they moved out of cities through rural electrification programs, a shift that highlights the state as a multi-scalar and variegated actor that both aided and impeded electrification efforts by various institutional and corporate entities. Ultimately, I argue that the historical geography of electricity is a critical factor that must be considered in order to adequately understand and address the issues of inequality and poverty that continue to persist in the region.

Harrison, Conor M.

334

Multifunctional Inflatable Structure Being Developed for the PowerSphere Concept  

NASA Technical Reports Server (NTRS)

The continuing development of microsatellites and nanosatellites for low Earth orbits requires the collection of sufficient power for instruments onboard a low-weight, low-volume spacecraft. Because the overall surface area of a microsatellite or nanosatellite is small, body-mounted solar cells cannot provide enough power. The deployment of traditional, rigid, solar arrays necessitates larger satellite volumes and weights, and also requires extra apparatus for pointing. One solution to this power choke problem is the deployment of a spherical, inflatable power system. This power system, termed the "PowerSphere," has several advantages, including a high collection area, low weight and stowage volume, and the elimination of solar array pointing mechanisms.

Peterson, Todd T.

2003-01-01

335

Satellite power system concept development and evaluation program. Volume 2: System definition  

NASA Technical Reports Server (NTRS)

The system level results of the system definition studies performed by NASA as a part of the Department of Energy/NASA satellite power system concept development and evaluation program are summarized. System requirements and guidelines are discussed as well as the major elements that comprise the reference system and its design options. Alternative system approaches including different system sizes, solid state amplifier (microwave) concepts, and laser power transmission system cost summaries are reviewed. An overview of the system analysis and planning efforts is included. The overall study led to the conclusion that the reference satellite power system concept is a feasible baseload source of electrical power and, within the assumed guidelines, the minimum cost per kilowatt is achieved at the maximum output of 5 gigawatts to the utility grid. Major unresolved technical issues include maximum allowable microwave power density in the ionosphere and performance/mass characteristics of laser power transmission systems.

1981-01-01

336

Development of high average power DPSSL for laser fusion driver and industrial application  

SciTech Connect

Laser fusion is one of the most feasible approach in the fusion energy development. The goal of inertial fusion energy (IFE) development is to prove that fusion energy can be available to society as electric power source. Recent progress of laser fusion research and development enable the authors to examine technical and economical feasibility, and to plan the realistic strategy and program to the commercial power plant. The most important key issue for IFE is driver technologies. The development of the laser fusion driver may establish new industrial technologies based on the photon processes and is attracting attentions in wide industrial fields.

Nakai, S.; Izawa, Y.; Nakatsuka, M.; Yamanaka, M. [Osaka Univ. (Japan)] [and others

1996-12-31

337

Developing Information Power Grid Based Algorithms and Software  

NASA Technical Reports Server (NTRS)

This exploratory study initiated our effort to understand performance modeling on parallel systems. The basic goal of performance modeling is to understand and predict the performance of a computer program or set of programs on a computer system. Performance modeling has numerous applications, including evaluation of algorithms, optimization of code implementations, parallel library development, comparison of system architectures, parallel system design, and procurement of new systems. Our work lays the basis for the construction of parallel libraries that allow for the reconstruction of application codes on several distinct architectures so as to assure performance portability. Following our strategy, once the requirements of applications are well understood, one can then construct a library in a layered fashion. The top level of this library will consist of architecture-independent geometric, numerical, and symbolic algorithms that are needed by the sample of applications. These routines should be written in a language that is portable across the targeted architectures.

Dongarra, Jack

1998-01-01

338

Adult development and the transformative powers of psychotherapy.  

PubMed

This article explores the ways in which receiving, providing, and teaching others to do psychotherapy have influenced my adult development. In my 70s, I arrived at the conviction that at every stage of adulthood, practicing psychotherapy has had a direct and causal influence on my efforts to fill my personal life with meaning, virtue, and maturity. The first section of this article focuses on the ways in which learning to be a particular kind of psychoanalytic therapist facilitated my transition into early adulthood. The middle sections describe how I have used the professional practice of psychotherapy to integrate or dissolve the boundaries between work and play, and science and art, in the everyday conduct of my life. My psychobiographical analysis concludes with some reflections on a professional failure and the compensations of being an aging therapist. PMID:24953767

Geller, Jesse D

2014-08-01

339

Development and Testing of the Glenn Research Center Visitor's Center Grid-Tied Photovoltaic Power System  

NASA Technical Reports Server (NTRS)

The NASA Glenn Research Center (GRC) has developed, installed, and tested a 12 kW DC grid-tied photovoltaic (PV) power system at the GRC Visitor s Center. This system utilizes a unique ballast type roof mount for installing the photovoltaic panels on the roof of the Visitor s Center with no alterations or penetrations to the roof. The PV system has generated in excess of 15000 kWh since operation commenced in August 2008. The PV system is providing power to the GRC grid for use by all. Operation of the GRC Visitor s Center PV system has been completely trouble free. A grid-tied PV power system is connected directly to the utility distribution grid. Facility power can be obtained from the utility system as normal. The PV system is synchronized with the utility system to provide power for the facility, and excess power is provided to the utility. The project transfers space technology to terrestrial use via nontraditional partners. GRC personnel glean valuable experience with PV power systems that are directly applicable to various space power systems, and provides valuable space program test data. PV power systems help to reduce harmful emissions and reduce the Nation s dependence on fossil fuels. Power generated by the PV system reduces the GRC utility demand, and the surplus power aids the community. Present global energy concerns reinforce the need for the development of alternative energy systems. Modern PV panels are readily available, reliable, efficient, and economical with a life expectancy of at least 25 years. Modern electronics has been the enabling technology behind grid-tied power systems, making them safe, reliable, efficient, and economical with a life expectancy of at least 25 years. Based upon the success of the GRC Visitor s Center PV system, additional PV power system expansion at GRC is under consideration. The GRC Visitor s Center grid-tied PV power system was successfully designed and developed which served to validate the basic principles described, and the theoretical work that was performed. The report concludes that grid-tied photovoltaic power systems are reliable, maintenance free, long life power systems, and are of significant value to NASA and the community.

Eichenberg, Dennis J.

2009-01-01

340

Development of current injection based three phase unbalanced continuation power flow for distribution system  

NASA Astrophysics Data System (ADS)

Voltage stability studies (VSS) of the electric network is a crucial factor to make the system operate in stable region and to prevent power blackouts. There are several commercial tools available for VSS of electric transmission systems (TS) but not many for distribution systems (DS). With increasing penetration of distributed renewable generations and meshed network within DS, shipboard power system (SPS) and microgrid, these VSS tools need to be extended for DS. Due to inherent characteristic like high R/X ratio, three phase and unbalanced operation, DS or SPS requires different mathematical approach than TS. Unbalanced three phase power flow and continuation power flow tools were developed using current injection and corrector predictor methods in this work for VSS. Maximum loading point for given DS or SPS can be computed using developed tools to guide required preventive and corrective actions. Developed tool was tested and validated for several different test cases.

Toppo, Shilpa

341

Conceptual definition of a technology development mission for advanced solar dynamic power systems  

NASA Technical Reports Server (NTRS)

An initial conceptual definition of a technology development mission for advanced solar dynamic power systems is provided, utilizing a space station to provide a dedicated test facility. The advanced power systems considered included Brayton, Stirling, and liquid metal Rankine systems operating in the temperature range of 1040 to 1400 K. The critical technologies for advanced systems were identified by reviewing the current state of the art of solar dynamic power systems. The experimental requirements were determined by planning a system test of a 20 kWe solar dynamic power system on the space station test facility. These requirements were documented via the Mission Requirements Working Group (MRWG) and Technology Development Advocacy Group (TDAG) forms. Various concepts or considerations of advanced concepts are discussed. A preliminary evolutionary plan for this technology development mission was prepared.

Migra, R. P.

1986-01-01

342

NASA's PEM Fuel Cell Power Plant Development Program for Space Applications  

NASA Technical Reports Server (NTRS)

A three-center NASA team led by the Glenn Research Center in Cleveland, Ohio is completing a five-year PEM fuel cell power plant development program for future space applications. The focus of the program has been to adapt commercial PEM fuel cell technology for space applications by addressing the key mission requirements of using pure oxygen as an oxidant and operating in a multi-gravity environment. Competing vendors developed breadboard units in the 1 to 5 kW power range during the first phase of the program, and a single vendor developed a nominal 10-kW engineering model power pant during the second phase of the program. Successful performance and environmental tests conducted by NASA established confidence that PEM fuel cell technology will be ready to meet the electrical power needs of future space missions.

Hoberecht, Mark A.

2008-01-01

343

An integrated and modular digital modeling approach for the space station electrical power system development  

NASA Technical Reports Server (NTRS)

An electrical power system for the Space Station was designed, developed and built. This system provides for electrical power generation, conditioning, storage, and distribution. The initial configuration uses photovoltaic power generation. The power system control is based on a hierarchical architecture to support the requirements of automation. In the preliminary design and technology development phase of the program, various modeling techniques and software tools were evaluated for the purpose of meeting the Space Station power system modeling requirements. Rocketdyne and LeRC jointly selected the EASY5 simulation software, developed by Boeing Computer Services, as a system level modeling tool. The application of the selected analytical modeling approach to represent the entire power system is described. Typical results of model predictions are also summarized. The equipment modeled includes solar arrays, dc to ac converters, resonant inverters, battery storage system, alternator, transmission line, switch gear, and system level microprocessor controls. During the advanced development phase of this program, several models were developed using this approach.

Gombos, Frank J.; Dravid, Narayan

1988-01-01

344

Design of isolated renewable hybrid power systems  

SciTech Connect

Isolated electrical power generating units can be used as an economically viable alternative to electrify remote villages where grid extension is not feasible. One of the options for building isolated power systems is by hybridizing renewable power sources like wind, solar, micro-hydro, etc. along with appropriate energy storage. A method to optimally size and to evaluate the cost of energy produced by a renewable hybrid system is proposed in this paper. The proposed method, which is based on the design space approach, can be used to determine the conditions for which hybridization of the system is cost effective. The simple and novel methodology, proposed in this paper, is based on the principles of process integration. It finds the minimum battery capacity when the availability and ratings of various renewable resources as well as load demand are known. The battery sizing methodology is used to determine the sizing curve and thereby the feasible design space for the entire system. Chance constrained programming approach is used to account for the stochastic nature of the renewable energy resources and to arrive at the design space. The optimal system configuration in the entire design space is selected based on the lowest cost of energy, subject to a specified reliability criterion. The effects of variation of the specified system reliability and the coefficient of correlation between renewable sources on the design space, as well as the optimum configuration are also studied in this paper. The proposed method is demonstrated by designing an isolated power system for an Indian village utilizing wind-solar photovoltaic-battery system. (author)

Sreeraj, E.S.; Chatterjee, Kishore [Department of Electrical Engineering, Indian Institute of Technology Bombay, Mumbai 400 076 (India); Bandyopadhyay, Santanu [Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Mumbai 400 076 (India)

2010-07-15

345

web page: http://w3.pppl.gov/~ zakharov Ignited Spherical Tokamaks for development of power reactor1  

E-print Network

web page: http://w3.pppl.gov/~ zakharov Ignited Spherical Tokamaks for development of power reactor to magnetic fusion, i.e., (a) development of the high fusion power density operational power reactor regime (OPRR), (b) design and develop- ment of low activation first wall (i.e., the first 15 cms

Zakharov, Leonid E.

346

Update on Development of SiC Multi-Chip Power Modules  

NASA Technical Reports Server (NTRS)

Progress has been made in a continuing effort to develop multi-chip power modules (SiC MCPMs). This effort at an earlier stage was reported in 'SiC Multi-Chip Power Modules as Power-System Building Blocks' (LEW-18008-1), NASA Tech Briefs, Vol. 31, No. 2 (February 2007), page 28. The following recapitulation of information from the cited prior article is prerequisite to a meaningful summary of the progress made since then: 1) SiC MCPMs are, more specifically, electronic power-supply modules containing multiple silicon carbide power integrated-circuit chips and silicon-on-insulator (SOI) control integrated-circuit chips. SiC MCPMs are being developed as building blocks of advanced expandable, reconfigurable, fault-tolerant power-supply systems. Exploiting the ability of SiC semiconductor devices to operate at temperatures, breakdown voltages, and current densities significantly greater than those of conventional Si devices, the designs of SiC MCPMs and of systems comprising multiple SiC MCPMs are expected to afford a greater degree of miniaturization through stacking of modules with reduced requirements for heat sinking; 2) The stacked SiC MCPMs in a given system can be electrically connected in series, parallel, or a series/parallel combination to increase the overall power-handling capability of the system. In addition to power connections, the modules have communication connections. The SOI controllers in the modules communicate with each other as nodes of a decentralized control network, in which no single controller exerts overall command of the system. Control functions effected via the network include synchronization of switching of power devices and rapid reconfiguration of power connections to enable the power system to continue to supply power to a load in the event of failure of one of the modules; and, 3) In addition to serving as building blocks of reliable power-supply systems, SiC MCPMs could be augmented with external control circuitry to make them perform additional power-handling functions as needed for specific applications. Because identical SiC MCPM building blocks could be utilized in such a variety of ways, the cost and difficulty of designing new, highly reliable power systems would be reduced considerably. This concludes the information from the cited prior article. The main activity since the previously reported stage of development was the design, fabrication, and testing a 120- VDC-to-28-VDC modular power-converter system composed of eight SiC MCPMs in a 4 (parallel)-by-2 (series) matrix configuration, with normally-off controllable power switches. The SiC MCPM power modules include closed-loop control subsystems and are capable of operating at high power density or high temperature. The system was tested under various configurations, load conditions, load-transient conditions, and failure-recovery conditions. Planned future work includes refinement of the demonstrated modular system concept and development of a new converter hardware topology that would enable sharing of currents without the need for communication among modules. Toward these ends, it is also planned to develop a new converter control algorithm that would provide for improved sharing of current and power under all conditions, and to implement advanced packaging concepts that would enable operation at higher power density.

Lostetter, Alexander; Cilio, Edgar; Mitchell, Gavin; Schupbach, Roberto

2008-01-01

347

A probabilistic assessment of large scale wind power development for long-term energy resource planning  

NASA Astrophysics Data System (ADS)

A steady decline in the cost of wind turbines and increased experience in their successful operation have brought this technology to the forefront of viable alternatives for large-scale power generation. Methodologies for understanding the costs and benefits of large-scale wind power development, however, are currently limited. In this thesis, a new and widely applicable technique for estimating the social benefit of large-scale wind power production is presented. The social benefit is based upon wind power's energy and capacity services and the avoidance of environmental damages. The approach uses probabilistic modeling techniques to account for the stochastic interaction between wind power availability, electricity demand, and conventional generator dispatch. A method for including the spatial smoothing effect of geographically dispersed wind farms is also introduced. The model has been used to analyze potential offshore wind power development to the south of Long Island, NY. If natural gas combined cycle (NGCC) and integrated gasifier combined cycle (IGCC) are the alternative generation sources, wind power exhibits a negative social benefit due to its high capacity cost and the relatively low emissions of these advanced fossil-fuel technologies. Environmental benefits increase significantly if charges for CO2 emissions are included. Results also reveal a diminishing social benefit as wind power penetration increases. The dependence of wind power benefits on natural gas and coal prices is also discussed. In power systems with a high penetration of wind generated electricity, the intermittent availability of wind power may influence hourly spot prices. A price responsive electricity demand model is introduced that shows a small increase in wind power value when consumers react to hourly spot prices. The effectiveness of this mechanism depends heavily on estimates of the own- and cross-price elasticities of aggregate electricity demand. This work makes a valuable contribution by synthesizing information from research in power market economics, power system reliability, and environmental impact assessment, to develop a comprehensive methodology for analyzing wind power in the context of long-term energy planning.

Kennedy, Scott Warren

348

The alternative strategies of the development of the nuclear power industry in the 21st century  

NASA Astrophysics Data System (ADS)

This paper emphasizes the urgency of scientific-and-technical and sociopolitical problems of the modern nuclear power industry without solving of which the transition from local nuclear power systems now in operation to a large-scale nuclear power industry would be impossible. The existing concepts of the longterm strategy of the development of the nuclear power industry have been analyzed. On the basis of the scenarios having been developed it was shown that the most promising alternative is the orientation towards the closed nuclear fuel cycle with fast neutron reactors (hereinafter referred to as fast reactors) that would meet the requirements on the acceptable safety. It was concluded that the main provisions of "The Strategy of the Development of the Nuclear Power Industry of Russia for the First Half of the 21st Century" approved by the Government of the Russian Federation in the year 2000 remain the same at present as well, although they require to be elaborated with due regard for new realities in the market for fossil fuels, the state of both the Russian and the world economy, as well as tightening of requirements related to safe operation of nuclear power stations (NPSs) (for example, after the severe accident at the Fukushima nuclear power station, Japan) and nonproliferation of nuclear weapons.

Goverdovskii, A. A.; Kalyakin, S. G.; Rachkov, V. I.

2014-05-01

349

The 20 GHz GaAs monolithic power amplifier module development  

NASA Technical Reports Server (NTRS)

The development of a 20 GHz GaAs FET monlithic power amplifier module for advanced communication applications is described. Four-way power combing of four 0.6 W amplifier modules is used as the baseline approach. For this purpose, a monolithic four-way traveling-wave power divider/combiner was developed. Over a 20 GHz bandwidth (10 to 30 GHz), an insertion loss of no more than 1.2 dB was measured for a pair of back-to-back connected divider/combiners. Isolation between output ports is better than 20 dB, and VSWRs are better than 21:1. A distributed amplifier with six 300 micron gate width FETs and gate and drain transmission line tapers has been designed, fabricated, and evaluated for use as an 0.6 W module. This amplifier has achieved state-of-the-art results of 0.5 W output power with at least 4 dB gain across the entire 2 to 21 GHz frequency range. An output power of 2 W was achieved at a measurement frequency of 18 GHz when four distributed amplifiers were power-combined using a pair of traveling-wave divider/combiners. Another approach is the direct common-source cascading of three power FET stages. An output power of up to 2W with 12 dB gain and 20% power-added efficiency has been achieved with this approach (at 17 GHz). The linear gain was 14 dB at 1 W output. The first two stages of the three-stage amplifier have achieved an output power of 1.6 W with 9 dB gain and 26% power-added efficiency at 16 GHz.

1984-01-01

350

Innovation on Energy Power Technology (22)Challenge to Development of Expert System stored Knowledge of Expert Power Network Operators  

NASA Astrophysics Data System (ADS)

Do you remember an expert system? I think there are various impressions about the system. For example, some might say “It reminds me of old days”. On the other hand, some might say “It was really troublesome”. About 25 years ago, from late 1980s to the middle of 1990s, when the Showa era was about to change into the Heisei Era, artificial intelligence boomed. Research and development for an expert system which was equipped with expertise and worked as smart as expert, was advanced in various fields. Our company also picked up the system as the new system which covered weak point of conventional computer technology. We started research and development in 1984, and installed an expert system in a SCADA system, which started operating in March 1990 in the Fukuoka Integrated Control Center. In this essay, as an electric power engineer who involved in development at that time, I introduce the situation and travail story about developing an expert system which support restorative actions from the outage and overload condition of power networks.

Sakaguchi, Hideharu

351

Develop and test fuel cell powered on site integrated total energy sysems: Phase 3: Full-scale power plant development  

NASA Technical Reports Server (NTRS)

A 25-cell stack of the 13 inch x 23 inch cell size (about 4kW) remains on test after 8300 hours, using simulated reformate fuel. A similar stack was previously shut down after 7000 hours on load. These tests have been carried out for the purpose of assessing the durability of fuel cell stack components developed through the end of 1983. A 25kW stack containing 175 cells of the same size and utilizing a technology base representative of the 25-cell stacks has been constructed and is undergoing initial testing. A third 4kW stack is being prepared, and this stack will incorporate several new technology features.

Kaufman, A.; Olson, B.; Pudick, S.; Wang, C. L.; Werth, J.; Whelan, J. A.

1986-01-01

352

Economic Development Impacts of Wind Power--Case Studies Fact Sheet  

SciTech Connect

OAK-B135 Interest in wind power development is growing as a means of expanding local economies. Such development holds promise as a provider of short-term employment during facility construction and long-term employment from ongoing facility operation and maintenance (O&M). It may also add to the supply of electric power in the area and support some expansion of the local economy through ripple effects resulting from initial increases in jobs and income. These ripple effects stem from subsequent expenditures for goods and services made possible by first-round income from the development, and are expressed in terms of a multiplier. If the local economy offers a wide range of goods and services the resulting multiplier can be substantial--as much as three or four. If not, then much of the initial income will leave the local economy to buy goods and services from elsewhere. Loss of initial income to other locales is referred to as a leakage. While there is a growing body of information about the local impacts of wind power, the economic impacts from existing wind power developments have not been thoroughly and consistently analyzed. Northwest Economic Associates, under contract to the National Wind Coordinating Committee (NWCC), conducted a study and produced a report entitled ''Assessing the Economic Development Impacts of Wind Power.'' The primary objective of the study was to provide examples of appropriate analyses and documentation of economic impacts from wind power development, using case studies of three existing projects in the United States. The findings from the case studies are summarized here; more detail is available in the report, available at NWCC's website http://www.nationalwind.org/. It should be noted that specific results presented apply only to the respective locales studied and are not meant to be representative of wind power in general. However, qualitative findings, discussed below, are likely to be replicated in most areas where wind development occurs.

NWCC Economic Development Work Group

2003-12-17

353

Assessment of the technology required to develop photovoltaic power system for large scale national energy applications  

NASA Technical Reports Server (NTRS)

A technical assessment of a program to develop photovoltaic power system technology for large-scale national energy applications was made by analyzing and judging the alternative candidate photovoltaic systems and development tasks. A program plan was constructed based on achieving the 10 year objective of a program to establish the practicability of large-scale terrestrial power installations using photovoltaic conversion arrays costing less than $0.50/peak W. Guidelines for the tasks of a 5 year program were derived from a set of 5 year objectives deduced from the 10 year objective. This report indicates the need for an early emphasis on the development of the single-crystal Si photovoltaic system for commercial utilization; a production goal of 5 x 10 to the 8th power peak W/year of $0.50 cells was projected for the year 1985. The developments of other photovoltaic conversion systems were assigned to longer range development roles. The status of the technology developments and the applicability of solar arrays in particular power installations, ranging from houses to central power plants, was scheduled to be verified in a series of demonstration projects. The budget recommended for the first 5 year phase of the program is $268.5M.

Lutwack, R.

1974-01-01

354

100kW Energy Transfer Multiplexer Power Converter Prototype Development Project  

SciTech Connect

Project Final Report for "100kW Energy Transfer Multiplexer Power Converter Prototype Development Project" prepared under DOE grant number DE-FG36-03GO13138. This project relates to the further development and prototype construction/evaluation for the Energy Transfer Multiplexer (ETM) power converter topology concept. The ETM uses a series resonant link to transfer energy from any phase of a multiphase input to any phase of a multiphase output, converting any input voltage and frequency to any output voltage and frequency. The basic form of the ETM converter consists of an eight (8)-switch matrix (six phase power switches and two ground power switches) and a series L-C resonant circuit. Electronic control of the switches allows energy to be transferred in the proper amount from any phase to any other phase. Depending upon the final circuit application, the switches may be either SCRs or IGBTs. The inherent characteristics of the ETM converter include the following: Power processing in either direction (bidirectional); Large voltage gain without the need of low frequency magnetics; High efficiency independent of output load and frequency; Wide bandwidth with fast transient response and; Operation as a current source. The ETM is able to synthesize true sinusoidal waveforms with low harmonic distortions. For a low power PM wind generation system, the ETM has the following characteristics and advantages: It provides voltage gain without the need of low frequency magnetics (DC inductors) and; It has constant high efficiency independent of the load. The ETM converter can be implemented into a PM wind power system with smaller size, reduced weight and lower cost. As a result of our analyses, the ETM offers wind power generation technology for the reduction of the cost and size as well as the increase in performance of low power, low wind speed power generation. This project is the further theoretical/analytical exploration of the ETM converter concept in relationship to PM wind power generator applications in the 100kW and under power range. The theoretical/analytical and bench scale work focuses on simplifying the basic ETM converter topology (in terms of parts count and complexity) for the specific application of the low power PM system. The project goals and objectives were for Spellman HV will develop a 100kW prototype ETM power converter based on paralleled lower ratings converters. The proposed configuration of this prototype is a 100kW rated converter comprised of four (4) 34kW rated modules connected in parallel (the fourth converter is included to demonstrate N+1 fault tolerance). This approach is more viable as there is lower technological risk involved in developing a 34kW-rated converter than a single 100kW unit. The modular system approach should have a lower deployment and service cost over a single unit system, because of the economics of scale (smaller units at a higher volume means lower manufacturing cost) and because of improved serviceability (a non-redundant power system with one failed module will still operate at a lower power level). There is also the added benefit that greater commercial application and acceptance should be achieved by having a modular system available in which fault tolerance (N+1 or 2N) is a feature. This modular approach would allow the output power to be increased by adding more paralleled converters. Thus, the maximum output power of the overall power system is a function of the interconnection medium (the hot swap connection subsystem), rather than the ratings of a single module. The project was implemented with Spellman HV acting as the program management and production assembly and test facility; The Baker Company acting as a technical consultant and resource when required; and dtm Associates acting as the design/development resource for the hardware development of the 100kW ETM converter prototype.

S. Merrill Skeist; Richard H. (Dick) Baker; Anthony G.P. Marini; DOE Project Officer - Keith Bennett

2006-03-21

355

Development of a uninterrupted power system: ac and dc to dc converter  

NASA Technical Reports Server (NTRS)

This program covered the design, fabrication and testing of an advanced development model uninterrupted power system. The input and output requirements imposed on the power processor were specified such that the unit is electrically interchangeable with existing power systems used by the Federal Aviation Administration in installations which have a history of failure due to electrical transient conditions. Input power is from either of two single-phase ac power sources or batteries with electronic selection and transfer between power sources. Battery reconditioning is automatic when either ac source is present. The output power is rated at 84OW; the nominal output is 24V at 35A. Within the 84OW limit, the regulated output voltage is adjustable from 22V to 30Vdc. Protection against continuous overloading or short circuit is provided. The unit is packaged in a standard 19-inch rack mount configuration with 7-inch panel height. Controls are on the front panel with power input and output through connectors on the rear surface. Cooling is by free convection from fin areas located on the side and rear panels. The packaged unit weighs 52.8 lbs., which can be reduced significantly if a three-phase ac power source is used.

Cronin, D. L.; Schoenfeld, A. D.

1973-01-01

356

Virginia Tech Comprehensive Power-based Fuel Consumption Model: Model Development and Testing  

E-print Network

data collection. The research presented in this paper develops two simple fuel consumption models The transportation sector consumes approximately 30% of the total energy in the United States, which is mostlyVirginia Tech Comprehensive Power-based Fuel Consumption Model: Model Development and Testing

Rakha, Hesham A.

357

Career Adaptability Development in Adolescence: Multiple Predictors and Effect on Sense of Power and Life Satisfaction  

ERIC Educational Resources Information Center

This longitudinal panel study investigated predictors of career adaptability development and its effect on development of sense of power and experience of life satisfaction among 330 Swiss eighth graders. A multivariate measure of career adaptability consisting of career choice readiness, planning, exploration, and confidence was applied. Based on…

Hirschi, Andreas

2009-01-01

358

Human factors guide for nuclear power plant control room development. Final report  

Microsoft Academic Search

This document provides a framework for systematically applying human factors principles and criteria throughout the development of a nuclear power plant control room. It presents guidelines for conducting human factors planning, analysis, design, and evaluation efforts. The document contains seven chapters. Chapter 1 identifies relationships between plant development phases and human factors applications, and presents step-by-step guidelines for structuring a

R. G. Kinkade; J. Anderson

1984-01-01

359

An improved approach to application-specific power electronics education. Curriculum development  

Microsoft Academic Search

This paper presents an innovative power electronics curriculum spanning the undergraduate and graduate programs. The curriculum develops the basic concepts of the field and applies them to modern industrial challenges to solve practical problems. It is based on three fundamental disciplines: switching devices, circuits and topologies and control and drives. The curriculum, which will facilitate the development of optimal systems,

Erik A. McShane; Malay Trivedi; Krishna Shenai

2001-01-01

360

Solar Power Generation for ICT and Sustainable Development in Emerging Economies  

ERIC Educational Resources Information Center

Purpose: The purpose of this paper is to systematically examine and draw attention to the potential benefits of solar power generation for access to and use of information and communication technologies (ICT) aimed at sustainable development in emerging economies. Design/methodology/approach: Electricity plays a crucial role in the development and…

Paul, Damasen I.; Uhomoibhi, James

2012-01-01

361

A Teaching Strategy for Developing the Power of Observation in Science Education  

ERIC Educational Resources Information Center

Despite the importance of observation in knowledge building, it has received less attention than experimental forms of inquiry in science education. Therefore, the aims of this study are to use observation strategies for developing the power of observation in science education and to develop student teachers' skills of observation process. The…

Oguz-Unver, Ayse; Yurumezoglu, Kemal

2009-01-01

362

Challenges in meeting increasing power demand of developing economies without damaging the environment  

Microsoft Academic Search

With the increasing share of global emission from developing countries, the importance of greenhouse gas (GHG) emission reduction in these countries cannot be neglected in order to address the global warming issue. The developed countries have invested tremendously in and proclaimed renewable energy and associated smart power technologies as a possible solution to meet their energy demands and reduce their

Siong Lee Koh; Yun Seng Lim

2010-01-01

363

ASME development of risk-based inspection guidelines for nuclear power plants  

Microsoft Academic Search

A methodology has been developed for use in preparing guidelines for the in-service inspection of nuclear power plant pressure boundary and structural components. This methodology is a further development of a general methodology previously published by the task force for application to any industry. It is unique in that it utilizes probabilistic risk assessment (PRA) information to improve the quantification

B. F. Gore; K. R. Balkey

1992-01-01

364

Development of an ultra sonic phased array system for nondestructive tests of nuclear power plant components  

Microsoft Academic Search

A phased array ultrasonic inspection (PAULI) system is being developed to obtain electronically scanned ultrasonic images of the inside of nuclear power plant components for nondestructive evaluation. The development strategy of PAULI system was the modification of a medical ultrasound imaging system that had 64 individual transceiver channels. Optimization of array transducers has been also pursued based on the systematic

Sung-Jin Song; Hyeon Jae Shin; You Hyun Jang

2002-01-01

365

Development of knowledge base of fault diagnosis system in solar power tower plants  

Microsoft Academic Search

Solar Power Tower (SPT) plant is a hugeous and complicated system, thus there have not been relative research productions on the record in the aspect of developing the knowledge base of its Fault Diagnosis System (FDS) in the whole world yet. In this paper, a modular and hierarchical knowledge base of FDS is designed and developed to use in SPT

S. Guo; D. Y. Liu; T. Z. Guo; C. Xu; D. S. Wan; W. Huang

2009-01-01

366

New challenges to power system planning and operation of smart grid development in China  

Microsoft Academic Search

The future development trend of electric power grid is smart grid, which includes such features as secure and reliable, efficient and economical, clean and green, flexible and compatible, open and interactive, integrated and so on. The concept and characteristics of smart grid are introduced in this paper. On the basis of practical national situation, the development plans of smart grid

Zhang Ruihua; Du Yumei; Yuhong Liu

2010-01-01

367

Hidden agendas, power and managerial assumptions in information systems development : An ethnographic study  

Microsoft Academic Search

A number of researchers have drawn attention to the way in which information systems development is an inherently political activity. Using the critical social theory of Jurgen Habermas, discusses the development of an information system in mental health. Using critical ethnography, reveals otherwise hidden agendas, power and managerial assumptions to be deeply embedded in the project. Raises broader questions about

Michael D. Myers; Leslie W. Young

1997-01-01

368

Development of gallium arsenide high-speed, low-power serial parallel interface modules: Executive summary  

NASA Technical Reports Server (NTRS)

Final report to NASA LeRC on the development of gallium arsenide (GaAS) high-speed, low power serial/parallel interface modules. The report discusses the development and test of a family of 16, 32 and 64 bit parallel to serial and serial to parallel integrated circuits using a self aligned gate MESFET technology developed at the Honeywell Sensors and Signal Processing Laboratory. Lab testing demonstrated 1.3 GHz clock rates at a power of 300 mW. This work was accomplished under contract number NAS3-24676.

1988-01-01

369

IEEE POWER ENGINEERING SOCIETY ENERGY DEVELOPMENT AND POWER GENERATION COMMITTEE International Practices Subcommittee PANEL SESSION: Developments in Implementing Technology to Limit Greenhouse Gases  

E-print Network

The Panel Session discussed the latest progress and technology developments to limit greenhouse gas emissions. Reviewed was the status of scientific debate on global warming and climate change, progress in technology on limiting climate change, the California Climate Registry, Ontario Power Generation's Green Response Program, and an IEEE Standard for CO2 Credits. There was also a presentation on whether or not there is an energy crisis, and a discussion on economic growth and greenhouse gas reduction.

Chairman T. J. Hammons; International Practices; Energy Development

370

Progress in space nuclear reactor power systems technology development - The SP-100 program  

NASA Technical Reports Server (NTRS)

Activities related to the development of high-temperature compact nuclear reactors for space applications had reached a comparatively high level in the U.S. during the mid-1950s and 1960s, although only one U.S. nuclear reactor-powered spacecraft was actually launched. After 1973, very little effort was devoted to space nuclear reactor and propulsion systems. In February 1983, significant activities toward the development of the technology for space nuclear reactor power systems were resumed with the SP-100 Program. Specific SP-100 Program objectives are partly related to the determination of the potential performance limits for space nuclear power systems in 100-kWe and 1- to 100-MW electrical classes. Attention is given to potential missions and applications, regimes of possible space power applicability, safety considerations, conceptual system designs, the establishment of technical feasibility, nuclear technology, materials technology, and prospects for the future.

Davis, H. S.

1984-01-01

371

Development of a computer-controlled magnet power supply for KEK PS beam lines  

NASA Astrophysics Data System (ADS)

This paper reports the present status of the development of computer-controlled magnet power supplies (12-phase thyristor converter) for the KEK 12 GeV proton-synchrotron beam lines. We have been developing a power supply in which an 8-bit microcomputer is embedded and which can be interfaced to a host computer. This power supply has the following advantages: (1) the load on the host computer is reduced; (2) maintenance of the power supplies becomes easier; and (3) the current control is carried out by a microcomputer program instead of conventional regulator circuits. At present a current stability of 2×10 -4 has been achieved within 10 ms for a 1% change of line voltage. 2.5% of CPU time is used for this current control.

Suzuki, Yoshihiro; Takasaki, Minoru

1990-08-01

372

Biomass power for rural development. Technical progress report, Phase 2, July 1--September 30, 1998  

SciTech Connect

The project undertaken by the Salix Consortium is a multi-phased, multi-partner endeavor. Phase 1 focused on initial development and testing of the technology and forging the necessary agreements to demonstrate commercial willow production. The Phase 1 objectives have been successfully completed: preparing final design plans for two utility pulverized coal boiler for 20 MW of biopower capacity; developing fuel supply plans for the project with a goal of establishing 365 ha (900 ac) of willow; obtaining power production commitments from the power companies for Phase 2; obtaining construction and environmental permits; and developing an experimental strategy for crop production and power generation improvements needed to assure commercial success. The R and D effort also addresses environmental issues pertaining to introduction of the willow energy system. Beyond those Phase 1 requirements, the Consortium has already successfully demonstrated cofiring at Greenidge Station and has initiated development of the required nursery capacity for acreage scale-up. In Phase 2 every aspect of willow production and power generation from willow biomass will be demonstrated. The ultimate objective of Phase 2 is to transition the work performed under the Biomass Power for Rural Development project into a thriving, self-supported energy crop enterprise.

Neuhauser, E.

1999-01-01

373

Feature of high flux engineering test reactor and its role in nuclear power development  

SciTech Connect

The High Flux Engineering Test Reactor (HFETR) designed and built by China own efforts reached to its initial criticality on Dec. 27, 1979, and then achieved high power operation on Dec. 16, 1980. Until Nov. 11, 1986, the reactor had been operated for thirteen cycles. The paper presents briefly main feature of HFETR and its utilization during past years. The paper also deals with its role in nuclear power development. Finally, author gives his opinion on comprehensive utilization of HFETR.

Guangquan, L.

1988-01-01

374

PILOT TRIAL FOR THE ASSESSMENT OF RELATIVE BIOAVAILABILITY IN GENERIC DRUG PRODUCT DEVELOPMENT: STATISTICAL POWER  

Microsoft Academic Search

In developing generic drug products, pilot trials are used for identifying successful test formulations to enter pivotal trials. In this study, we derive the power function based on the log-normal distribution and evaluate the effects of potential influential factors—the true test-reference ratio, intrasubject variability, and sample sizes—on the statistical power of a pilot trial to identify successful test formulations, defined

Yibin Wang; Shuqin Zhou

1999-01-01

375

Trends and problems in development of the power plants electrical part  

NASA Astrophysics Data System (ADS)

The article discusses some problems relating to development of the electrical part of modern nuclear and thermal power plants, which are stemming from the use of new process and electrical equipment, such as gas turbine units, power converters, and intellectual microprocessor devices in relay protection and automated control systems. It is pointed out that the failure rates of electrical equipment at Russian and foreign power plants tend to increase. The ongoing power plant technical refitting and innovative development processes generate the need to significantly widen the scope of research works on the electrical part of power plants and rendering scientific support to works on putting in use innovative equipment. It is indicated that one of main factors causing the growth of electrical equipment failures is that some of components of this equipment have insufficiently compatible dynamic characteristics. This, in turn may be due to lack or obsolescence of regulatory documents specifying the requirements for design solutions and operation of electric power equipment that incorporates electronic and microprocessor control and protection devices. It is proposed to restore the system of developing new and updating existing departmental regulatory technical documents that existed in the 1970s, one of the fundamental principles of which was placing long-term responsibility on higher schools and leading design institutions for rendering scientific-technical support to innovative development of components and systems forming the electrical part of power plants. This will make it possible to achieve lower failure rates of electrical equipment and to steadily improve the competitiveness of the Russian electric power industry and energy efficiency of generating companies.

Gusev, Yu. P.

2015-03-01

376

PSEUDOSPARK SWITCH DEVELOPMENT AT SIEMENS - COMPACT HIGH POWER SWITCHES FOR GAS DISCHARGE LASERS AND  

Microsoft Academic Search

The development of high average power, high peak power pseudospark switches for use in TE gas discharge lasers and applications requiring similar ratings is reported. The results achieved as of today in metaceramic sealed-off experimental tubes of conventional pseudospark geometry are: hold-off voltage 32 kV; peak current 15 kA; pulse duration 300 ns; current rate of rise > 300 Wp;

D. W. Branston; W. Hartmann; G. Lins; H. D. Rohde; J. Stroh

1993-01-01

377

The development of a small PEMFC combined heat and power system  

Microsoft Academic Search

A proton exchange membrane fuel cell combined heat and power system has been chosen as a platform on which key components and system integration technologies have been developed to advance the applications of fuel-cell technology. The prototype system consists mainly of a fuel-cell stack, a natural gas reformer to supply hydrogen-rich reformate gas to the stack, a power conditioner to

Hsin-Sen Chu; Fanghei Tsau; Yi-Yie Yan; Kan-Lin Hsueh; Fa-Lin Chen

2008-01-01

378

Optimal loading range for the development of peak power output in the hexagonal barbell jump squat.  

PubMed

Recent studies indicate that the utilization of the hexagonal barbell jump squat (HBJS) compared to the traditional barbell jump squat may offer a superior method of developing peak power. The notion that a single optimal load may be prescribed in training programmes aiming to develop peak power is subject to debate. The purpose of this study was to identify the optimal load corresponding with peak power output during the HBJS in professional rugby union players. Seventeen professional rugby union players participated in this study. Participants performed 3 unloaded countermovement jumps on a force-plate, as well as 3 HBJS at each of the following randomized loads: 10%, 20%, 30% and 40% of box-squat 1 repetition maximum (1RM). Peak power output was the dependent variable of interest. A one-way repeated measures ANOVA was conducted to compare peak power output across each load. A significant main effect for load was observed [Wilk's Lambda = 0.11, F (4, 13) = 18.07, p < 0.01, partial eta squared = 0.88]. Results of the Bonferroni adjusted pairwise comparisons indicated that peak power output in the HBJS is optimized at a load range between 10-20% of box squat 1RM. The results of this study indicate that the use of the HBJS with a training load between 10-20% of box squat 1RM optimizes peak power output in professional rugby union players. PMID:25486301

Turner, Thomas S; Tobin, Daniel P; Delahunt, Eamonn

2014-12-01

379

On-site fuel cell power plant technology development program. Annual report Jan 81-Dec 81  

SciTech Connect

Fuel cell power plant designs, specifications and technologies were evaluated to define a power plant approach having the potential for meeting initial on-site commercial service market requirements and costs. An initial commercial market segment was defined for a range of power plant sizes. A preliminary power plant specification and model power plant system were selected as a baseline for further technology development and cost reduction efforts in subsequent program phases. Inverter designs with advanced individual commutation circuitry were defined and evaluated. Sulphur-tolerant reformer catalysts were tested and cell performance on sulphur-bearing fuels was determined. Electrode substrates having greater electrolyte storage capacity and intercell cooler concepts having improved corrosion resistance were developed. Life characteristics of water cleanup demineralizer resins were determined as a function of operating temperature. Commercial equipment availability was established for a number of heat exchangers, electromechanical components and controls for the power plant configurations being considered for on-site applications. Two 24-cell stacks operating at 40-kW power plant conditions reached 11,765 hours and 24,000 hours.

Mientek, A.P.

1982-07-01

380

Development Status of the NASA 30-cm Ion Thruster and Power Processor  

NASA Technical Reports Server (NTRS)

Xenon ion propulsion systems are being developed by NASA Lewis Research Center and the Jet Propulsion Laboratory to provide flight qualification and validation for planetary and earth-orbital missions. In the ground-test element of this program, light-weight (less than 7 kg), 30 cm diameter ion thrusters have been fabricated, and preliminary design verification tests have been conducted. At 2.3 kW, the thrust, specific impulse, and efficiency were 91 mN, 3300 s, and 0.65, respectively. An engineering model thruster is now undergoing a 2000 h wear-test. A breadboard power processor is being developed to operate from an 80 V to 120 V power bus with inverter switching frequencies of 50 kHz. The power processor design is a pathfinder and uses only three power supplies. The projected specific mass of a flight unit is about 5 kg/kW with an efficiency of 0.92 at the full-power of 2.5 kW. Preliminary integration tests of the neutralizer power supply and the ion thruster have been completed. Fabrication and test of the discharge and beam/accelerator power stages are underway.

Sovey, James S.; Haag, Thomas W.; Hamley, John A.; Mantenieks, Maris A.; Patterson, Michael J.; Pinero, Luis R.; Rawlin, Vincent K.; Kussmaul, Michael T.; Manzella, David H.; Myers, Roger M.

1994-01-01

381

Development of a microprocessor controller for stand-alone photovoltaic power systems  

NASA Technical Reports Server (NTRS)

A controller for stand-alone photovoltaic systems has been developed using a low power CMOS microprocessor. It performs battery state of charge estimation, array control, load management, instrumentation, automatic testing, and communications functions. Array control options are sequential subarray switching and maximum power control. A calculator keypad and LCD display provides manual control, fault diagnosis and digital multimeter functions. An RS-232 port provides data logging or remote control capability. A prototype 5 kW unit has been built and tested successfully. The controller is expected to be useful in village photovoltaic power systems, large solar water pumping installations, and other battery management applications.

Millner, A. R.; Kaufman, D. L.

1984-01-01

382

High power diode pumped solid state laser development at Lawrence Livermore National Laboratory  

SciTech Connect

The authors recent developments in high powered diode pumped solid state lasers at Lawrence Livermore National Laboratory. Over the past year the authors have made continued improvements to semiconductor pump array technology which includes the development of higher average power and lower cost pump modules. They report the performance of high power AlGaAs, InGaAs, and AlGaInP arrays. They also report on improvement to the integrated micro-optics designs in conjunction with lensing duct technology which gives rise to very high performance end pumping designs for solid state lasers which have major advantages which they detail. Substantial progress on beam quality improvements to near the diffraction limit at very high power have also been made and will be reported. They also will discuss recent experiments on high power non-linear materials for q-switches, harmonic converters, and parametric oscillators. Advances in diode pumped devices at LLNL which include tunable Cr:LiSrAlF{sub 6}, mid-IR Er:YAG, holmium based lasers and other developments will also be outlined. Concepts for delivering up to 30 kilowatts of average power from a DPSSL oscillator will be described.

Solarz, R.; Albrecht, G.; Hackel, L. [and others

1994-03-01

383

Appropriate Methodology for Assessing the Economic Development Impacts of Wind Power  

SciTech Connect

OAK-B135 Interest in wind power development is growing as a means of expanding local economies. Such development holds promise as a provider of short-term employment during facility construction and long-term employment from ongoing facility operation and maintenance. It may also support some expansion of the local economy through ripple effects resulting from initial increases in jobs and income. However, there is a need for a theoretically sound method for assessing the economic impacts of wind power development. These ripple effects stem from subsequent expenditures for goods and services made possible by first-round income from the development, and are expressed in terms of a multiplier. If the local economy offers a wide range of goods and services the resulting multiplier can be substantial--as much as three or four. If not, then much of the initial income will leave the local economy to buy goods and services from elsewhere. Loss of initial income to other locales is referred to as a leakage. Northwest Economic Associates (NEA), under contract to the National Wind Coordinating Committee (NWCC), investigated three case study areas in the United States where wind power projects were recently developed. The full report, ''Assessing the Economic Development Impacts of Wind Power,'' is available at NWCC's website http://www.nationalwind.org/. The methodology used for that study is summarized here in order to provide guidance for future studies of the economic impacts of other wind power developments. The methodology used in the NEA study was specifically designed for these particular case study areas; however, it can be generally applied to other areas. Significant differences in local economic conditions and the amount of goods and services that are purchased locally as opposed to imported from outside the will strongly influence results obtained. Listed below are some of the key tasks that interested parties should undertake to develop a reasonable picture of local economic impacts that may accrue from existing or future wind development.

NWCC Economic Development Work Group

2003-12-17

384

Progress in High Power Density SOFC Material Development for Aerospace Applications  

NASA Technical Reports Server (NTRS)

Solid oxide fuel cell (SOFC) systems for aircraft applications require order of magnitude increase in specific power density and long life under aircraft operating conditions. Advanced SOFC materials and fabrication processes are being developed at NASA GRC to increase specific power density and durability of SOFC cell and stack. Initial research efforts for increasing specific power density are directed toward increasing the operating temperature for the SOFC system and reducing the weight of the stack. While significant research is underway to develop anode supported SOFC system operating at temperatures in the range of 650 - 850 C for ground power generation applications, such temperatures may not yield the power densities required for aircraft applications. For electrode-supported cells, SOFC stacks with power densities greater than 1.0 W/sq cm are favorable at temperatures in excess of 900 C. The performance of various commercial and developmental anode supported cells is currently being evaluated in the temperature range of 900 to 1000 C to assess the performance gains and materials reliability. The results from these studies will be presented. Since metal interconnects developed for lower temperature operation are not practical at these high temperatures, advanced perovskite based ceramic interconnects with high electronic conductivity and lower sintering temperatures are being developed. Another option for increasing specific power density of SOFC stacks is to decrease the stack weight. Since the interconnect contributes to a significant portion of the stack weight, considerable weight benefits can be derived by decreasing its thickness. Eliminating the gas channels in the interconnect by engineering the pore structure in both anode and cathode can offer significant reduction in thickness of the ceramic interconnect material. New solid oxide fuel cells are being developed with porous engineered electrode supported structures with a 10 - 20 micron thin electrolyte. The performance data for advanced SOFC cells with engineered porosity in both electrodes will be presented.

Cable, Thomas L.; Sofie, Stephen W.; Setlock, John A.; Misra, Ajay K.

2004-01-01

385

Development of a model of on-board PEMFC powered locomotive with a metal hydride cylinder  

SciTech Connect

This paper presents a phase-zero evaluation case of installing on-off-board hybrid powered Electric Motor Vehicle (EMV) in existing and new local line and reports development of a model fuel cell powered locomotive. EMV such as electric car and locomotive are a new conceptual EMV using hybrid power between off-board substation and on-board Regenerative Fuel Cell (RFC) power system with Metal Hydride (MH) stored hydrogen generated with water electrolyzer by off-board surplus power. In this study, it is estimated a possibility to close power gap over 30% in placing the new conceptual vehicle. The Locomotive is a 110 cm long locomotive powered by a 20 W PEMFC configured with 20 cells and supplies with about 2 g hydrogen, from a cylinder of 100 g metal hydride, and natural convection air (O{sub 2}). Measuring 50 cm (W), 50 cm (H), and weighting 25.8 kgf, the locomotive has a permanent magnet motor with a rated power 38 W (12 V, 3 A) and ran on railway that has a gauge of 126 mm (3 feet 6 inches/8.5 = 4.94 inches), a length of 100 m. The performance of this train was acceleration of 0.5 m/s, cruising speed of 4.1 m/s at traction force of 15.8 N (1.6 kgf), average rolling friction of 5 N (460 gf).

Hasegawa, H.; Ohki, Y. [Railway Technical Research Inst., Kokubunji, Tokyo (Japan). Prototype Manufacturing Center

1995-12-31

386

Development of Frequency Stabilizing Scheme for Integrating Wind Power Generation into an Isolated Grid  

NASA Astrophysics Data System (ADS)

Integrating of wind power generation into small islands has been one of the demonstration projects in Okinawa prefecture. Since such integration could deteriorate power quality including frequency in an island grid, a frequency stabilizing system using flywheels has been installed into a small island. In order to establish a proper frequency stabilizing scheme for the small island, an accurate model of a diesel generator including governor is vital. Therefore, the model was developed based on the measured values of generator dump tests. A new frequency stabilizing scheme was also developed through time-domain simulation of the island grid model which consists of the above-mentioned diesel generator model and an equivalent load change representing wind power variation. The proper parameters of the scheme were derived considering role sharing between the diesel generators and the flywheels. The developed stabilizing scheme was applied to the flywheels in the island grid and revealed great performance for mitigating frequency variation.

Yamashita, Koji; Sakamoto, Orie; Kitauchi, Yoshihiro; Nanahara, Toshiya; Inoue, Toshio; Shiohama, Tomohiro; Fukuda, Hitoshi

387

Development of a rotary power transformer and inverter drive for spacecraft  

NASA Technical Reports Server (NTRS)

Many future satellites and spacecraft with spun and despun configurations will require the transfer of power across rotating interfaces in lieu of slip-rings and/or flexures. This is particularly true of spacecraft that have to demonstrate a long life expectancy. The rotary transformer has the desirable characteristics of high reliability and low noise, which qualify it as a potential replacement for slip rings. Development of a rotary power transformer follows the successful completion of a task to develop rotary signal-level transformers for the Galileo Spacecraft Project. The physical configuration of a rotary power transformer has a significant effect on its magnetic and electrical characteristics and therefore impacts the design of the dc/ac inverter driver. Important characteristics addressed during this development effort include: operating frequency, efficiency, transformer gap size, leakage inductance, and leakage flux. A breadboard inverter and rotary transformer were designed, fabricated and tested.

Mclyman, W. T.; Bridgeforth, A. O.

1983-01-01

388

High-Power Hall Propulsion Development at NASA Glenn Research Center  

NASA Technical Reports Server (NTRS)

The NASA Office of the Chief Technologist Game Changing Division is sponsoring the development and testing of enabling technologies to achieve efficient and reliable human space exploration. High-power solar electric propulsion has been proposed by NASA's Human Exploration Framework Team as an option to achieve these ambitious missions to near Earth objects. NASA Glenn Research Center (NASA Glenn) is leading the development of mission concepts for a solar electric propulsion Technical Demonstration Mission. The mission concepts are highlighted in this paper but are detailed in a companion paper. There are also multiple projects that are developing technologies to support a demonstration mission and are also extensible to NASA's goals of human space exploration. Specifically, the In-Space Propulsion technology development project at NASA Glenn has a number of tasks related to high-power Hall thrusters including performance evaluation of existing Hall thrusters; performing detailed internal discharge chamber, near-field, and far-field plasma measurements; performing detailed physics-based modeling with the NASA Jet Propulsion Laboratory's Hall2De code; performing thermal and structural modeling; and developing high-power efficient discharge modules for power processing. This paper summarizes the various technology development tasks and progress made to date

Kamhawi, Hani; Manzella, David H.; Smith, Timothy D.; Schmidt, George R.

2014-01-01

389

Development of NASA's Small Fission Power System for Science and Human Exploration  

NASA Technical Reports Server (NTRS)

Exploration of our solar system has brought great knowledge to our nation's scientific and engineering community over the past several decades. As we expand our visions to explore new, more challenging destinations, we must also expand our technology base to support these new missions. NASA's Space Technology Mission Directorate is tasked with developing these technologies for future mission infusion and continues to seek answers to many existing technology gaps. One such technology gap is related to compact power systems (greater than 1 kWe) that provide abundant power for several years where solar energy is unavailable or inadequate. Below 1 kWe, Radioisotope Power Systems have been the workhorse for NASA and will continue, assuming its availability, to be used for lower power applications similar to the successful missions of Voyager, Ulysses, New Horizons, Cassini, and Curiosity. Above 1 kWe, fission power systems become an attractive technology offering a scalable modular design of the reactor, shield, power conversion, and heat transport subsystems. Near term emphasis has been placed in the 1-10kWe range that lies outside realistic radioisotope power levels and fills a promising technology gap capable of enabling both science and human exploration missions. History has shown that development of space reactors is technically, politically, and financially challenging and requires a new approach to their design and development. A small team of NASA and DOE experts are providing a solution to these enabling FPS technologies starting with the lowest power and most cost effective reactor series named "Kilopower" that is scalable from approximately 1-10 kWe.

Gibson, Marc A.; Mason, Lee; Bowman, Cheryl; Poston, David I.; McClure, Patrick R.; Creasy, John; Robinson, Chris

2014-01-01

390

Space power system design and development from an economic point of view  

NASA Technical Reports Server (NTRS)

The concept of a satellite solar power system offers a feasible, but unproven, long-range energy alternative. While the basic physics of these systems is understood, many developments are necessary in order to reduce the system cost to the point of being cost-competitive with alternative energy sources. Thus, a substantial technology advancement and verification program, plus test and demonstration satellite programs are necessary before a full-scale satellite can be designed and built. It is important to properly identify those elements of the technology that should be subject to development efforts, the goals of the corresponding development programs and the appropriate funding levels and schedules. Systems studies and designs play a major role in rationally formulating a development program. This paper uses an economic approach to place these studies into a framework for formulating a viable satellite solar power system development plan.

Hazelrigg, G. A., Jr.

1977-01-01

391

Fission Surface Power Technology Development Testing at NASA's Early Flight Fission Test Facility  

NASA Technical Reports Server (NTRS)

Fission surface power (FSP) systems could be used to provide power anytime, anywhere on the surface of the Moon or Mars. FSP systems could be used at polar locations, at locations away from the poles, or in permanently shaded regions, with excellent performance at all sites. A potential reference 40 kWe option has been devised that is cost-competitive with alternatives while providing more power for less mass anywhere on the lunar surface. The reference FSP system (FSPS) is also readily extensible for use on Mars. At Mars the system would be capable of operating through global dust storms and providing year-round power at any Martian latitude. Under the NASA Exploration Technology Development Program (ETDP), NASA and the Department of Energy (DOE) have begun technology development on Fission Surface Power (FSP). The primary customer for this technology is the NASA Constellation Program which is responsible for the development of surface systems to support human exploration on the moon and Mars. The objectives of the FSP technology project are: 1) Develop FSP concepts that meet expected surface power requirements at reasonable cost with added benefits over other options. 2) Establish a hardware-based technical foundation for FSP design concepts and reduce overall development risk. 3) Reduce the cost uncertainties for FSP and establish greater credibility for flight system cost estimates. 4) Generate the key products to allow Agency decision-makers to consider FSP as a viable option for flight development. To be mass efficient, FSP systems must operate at higher coolant temperatures and use different types of power conversion than typical terrestrial systems. The primary reason is the difficulty in rejecting excess heat to space. Although many options exist, NASA s current reference FSP system uses a fast spectrum, pumped-NaK cooled reactor coupled to a Stirling power conversion subsystem. The reference system uses technology with significant terrestrial heritage while still providing excellent performance on the surface of the moon or Mars. Recent testing at NASA s Early Flight Fission Test Facility (EFF-TF) has helped assess the viability of the reference FSP system, and has helped evaluate methods for system integration. In June, 2009, a representative pumped NaK loop (provided by Marshall Space Flight Center) was coupled to a Stirling power converter (provided by Glenn Research Center) and tested at various conditions representative of those that would be seen during actual FSP system operation. In all areas, performance of the integrated system exceeded project goals. High-temperature NaK pump testing has also been performed at the EFF-TF, as has testing of methods for providing long-duration NaK purity.

Houts. Michael G.

2009-01-01

392

Overview of Intelligent Power Controller Development for Human Deep Space Exploration  

NASA Technical Reports Server (NTRS)

Intelligent or autonomous control of an entire spacecraft is a major technology that must be developed to enable NASA to meet its human exploration goals. NASA's current long term human space platform, the International Space Station, is in low earth orbit with almost continuous communication with the ground based mission control. This permits the near real-time control by the ground of all of the core systems including power. As NASA moves beyond Low Earth Orbit, the issues of communication time-lag and lack of communication bandwidth beyond geosynchronous orbit does not permit this type of operation. This paper presents the work currently ongoing at NASA to develop an architecture for an autonomous power control system as well as the effort to assemble that controller into the framework of the vehicle mission manager and other subsystem controllers to enable autonomous control of the complete spacecraft. Due to the common problems faced in both space power systems and terrestrial power system, the potential for spin-off applications of this technology for use in micro-grids located at the edge or user end of terrestrial power grids for peak power accommodation and reliability are described.

Soeder, James F.; Dever, Timothy P.; McNelis, Anne M.; Beach, Raymond F.; Trase, Larry M.; May, Ryan D.

2014-01-01

393

Overview of Intelligent Power Controller Development for Human Deep Space Exploration  

NASA Technical Reports Server (NTRS)

Intelligent or autonomous control of an entire spacecraft is a major technology that must be developed to enable NASA to meet its human exploration goals. NASA's current long term human space platform, the International Space Station, is in low Earth orbit with almost continuous communication with the ground based mission control. This permits the near real-time control by the ground of all of the core systems including power. As NASA moves beyond low Earth orbit, the issues of communication time-lag and lack of communication bandwidth beyond geosynchronous orbit does not permit this type of operation. This paper presents the work currently ongoing at NASA to develop an architecture for an autonomous power control system as well as the effort to assemble that controller into the framework of the vehicle mission manager and other subsystem controllers to enable autonomous control of the complete spacecraft. Due to the common problems faced in both space power systems and terrestrial power system, the potential for spin-off applications of this technology for use in micro-grids located at the edge or user end of terrestrial power grids for peak power accommodation and reliability are described.

Soeder, James F.; Dever, Timothy P.; McNelis, Anne M.; Beach, Raymond F.; Trase, Larry M.; May, Ryan D.

2014-01-01

394

Development of a Multi-bus, Multi-source Reconfigurable Stirling Radioisotope Power System Test Bed  

NASA Technical Reports Server (NTRS)

The National Aeronautics and Space Administration (NASA) has typically used Radioisotope Thermoelectric Generators (RTG) as their source of electric power for deep space missions. A more efficient and potentially more cost effective alternative to the RTG, the high efficiency 110 watt Stirling Radioisotope Generator 110 (SRG110) is being developed by the Department of Energy (DOE), Lockheed Martin (LM), Stirling Technology Company (STC) and NASA Glenn Research Center (GRC). The SRG110 consists of two Stirling convertors (Stirling Engine and Linear Alternator) in a dual-opposed configuration, and two General Purpose Heat Source (GPHS) modules. Although Stirling convertors have been successfully operated as a power source for the utility grid and as a stand-alone portable generator, demonstration of the technology required to interconnect two Stirling convertors for a spacecraft power system has not been attempted. NASA GRC is developing a Power System Test Bed (PSTB) to evaluate the performance of a Stirling convertor in an integrated electrical power system application. This paper will describe the status of the PSTB and on-going activities pertaining to the PSTB in the NASA Thermal-Energy Conversion Branch of the Power and On-Board Propulsion Technology Division.

Coleman, Anthony S.

2004-01-01

395

Developing a Computerized Aging Management System for Concrete Structures in Finnish Nuclear Power Plants  

NASA Astrophysics Data System (ADS)

Finland has four nuclear reactors units in two power plants. The first unit started operation in 1977 and in the early 1980's all four units were in use. During the last few years the aging management of the Nuclear Power Plant's (NPP) concrete structures has grown an important issue because the existing structures are reaching the end of their licensed operating lifetime (about 40 years). Therefore the nuclear power companies are developing aging management systems to avoid premature degradation of NPP facilities and to be able to extend their operating lifetime. This paper is about the development of a computerized ageing management system for the nuclear power plants concrete structures. The computerized ageing management system is built upon central database and implementation applications. It will assist the personnel of power companies to implement the aging management activities at different phases of the lifetime of a power plant. It will provide systematic methods for planning, surveillance, inspection, monitoring, condition assessment, maintenance and repair of structures.

Al-Neshawy, F.; Piironen, J.; Sistonen, E.; Vesikari, E.; Tuomisto, M.; Hradil, P.; Ferreira, M.

2013-07-01

396

Overview of Intelligent Power Controller Development for Human Deep Space Exploration  

NASA Technical Reports Server (NTRS)

Intelligent or autonomous control of an entire spacecraft is a major technology that must be developed to enable NASA to meet its human exploration goals. NASAs current long term human space platform, the International Space Station, is in low earth orbit with almost continuous communication with the ground based mission control. This permits the near real-time control by the ground of all of the core systems including power. As NASA moves beyond Low Earth Orbit, the issues of communication time-lag and lack of communication bandwidth beyond geosynchronous orbit does not permit this type of operation. This paper presents the work currently ongoing at NASA to develop an architecture for an autonomous power control system as well as the effort to assemble that controller into the framework of the vehicle mission manager and other subsystem controllers to enable autonomous control of the complete spacecraft. Due to the common problems faced in both space power systems and terrestrial power system, the potential for spin-off applications of this technology for use in micro-grids located at the edge or user end of terrestrial power grids for peak power accommodation and reliability are described.

Soeder, James F.; Dever, Timothy P.; McNelis, Anne M.; Beach, Raymond F.; Trase, Larry M.; May, Ryan

2014-01-01

397

Development of high-power all-solid-state lasers in the Japanese MITI project  

NASA Astrophysics Data System (ADS)

The 'Advanced Photon Processing and Measurement Technology' project was started in Aug. 1997 as part of the Industrial Science and Technology Frontier Program of the Agency of Industrial Science and Technology (AIST), MITI in Japan. In the project, 13 private companies and 1 university, which are the member of RIPE, and 4 national research institutes under MITI are developing new technologies using high-quality photon beams, by challenging 6 key themes in the 3 technology fields, 'Photon generation technology,' 'Photon-applied processing technology,' and 'Photon-applied measurement technology.' In the 'Photon generation technology,' we are developing 'High- power all-solid-state laser technology,' and 'Tightly-focusing all-solid-state laser technology.' The objective of the former theme is to develop LD-pumped all-solid-state laser devices of high power (greater than or equal to 10 kW), high efficiency (greater than or equal to 20%), and compact size (laser head less than or equal to 0.05m3). Recently, we obtained 3.3 kW output power from both rod-type and slab-type Nd:YAG laser oscillators. The objective of the latter theme is to develop compact all-solid-state laser devices of high power (greater than or equal to 1 kW), high efficiency (greater than or equal to 20%), for focusing the beam on a very small area of 50 micrometer in diameter of the processing object. In this theme we are developing two types of lasers, 'a disk or cylindrical shaped fiber laser pumped by LD from surroundings' and 'a high-brightness and high-rep-rate UV all-solid-state laser with CLBO crystal.' Recently, we obtained 10 W output power from the fiber laser and 20 W UV output power using CLBO crystal.

Matsuno, Ken-ichi; Sato, Toshio

2000-04-01

398

Development of an Instrument for Measuring Clinicians’ Power Perceptions in the Workplace  

PubMed Central

We report on the development of an instrument to measure clinicians’ perceptions of their personal power in the workplace in relation to resistance to computerized physician order entry (CPOE). The instrument is based on French and Raven’s six bases of social power and uses a semantic differential methodology. A measurement study was conducted to determine the reliability and validity of the survey. The survey was administered online and distributed via a URL by email to 19 physicians, nurses, and health unit coordinators from a university hospital. Acceptable reliability was achieved by removing or moving some semantic differential word pairs used to represent the six power bases (alpha range from 0.76–0.89). The Semantic Differential Power Perception (SDPP) survey validity was tested against an already validated instrument and found to be acceptable (correlation range from 0.51–0.81). The SDPP survey instrument was determined to be both reliable and valid. PMID:18375189

Bartos, Christa E.; Fridsma, Douglas B.; Butler, Brian S.; Penrod, Louis E.; Becich, Michael J.; Crowley, Rebecca S.

2008-01-01

399

Development of low head Kaplan turbine for power station rehabilitation project  

NASA Astrophysics Data System (ADS)

This paper presents the latest Kaplan turbine rehabilitation project for Funagira Power Station in Japan completed by J-POWER Group in collaboration with Toshiba Corporation. Area of rehabilitation was restricted to guide vane and runner. The main goal of the rehabilitation project was to expand the operating range of the existing turbine in terms of discharge and power with high operational stability, low noise as well as high cavitation performance. Computational Fluids Dynamics and model test were used to optimize the shape of guide vane and runner in development stage. Finally, field tests and runner inspection were carried out to confirm the performance of the new turbine. It was found that the new turbine has excellent performance in efficiency, power output, operational stability compared with existing turbine. Moreover, no sign of cavitation on the runner blade surface was observed after 5078 hours of operation near 100% load.

Lim, S. M.; Ohtake, N.; Kurosawa, S.; Suzuki, T.; Yamasaki, T.; Nishi, H.

2012-11-01

400

Power grid operation risk management: V2G deployment for sustainable development  

NASA Astrophysics Data System (ADS)

The production, transmission, and delivery of cost--efficient energy to supply ever-increasing peak loads along with a quest for developing a low-carbon economy require significant evolutions in the power grid operations. Lower prices of vast natural gas resources in the United States, Fukushima nuclear disaster, higher and more intense energy consumptions in China and India, issues related to energy security, and recent Middle East conflicts, have urged decisions makers throughout the world to look into other means of generating electricity locally. As the world look to combat climate changes, a shift from carbon-based fuels to non-carbon based fuels is inevitable. However, the variability of distributed generation assets in the electricity grid has introduced major reliability challenges for power grid operators. While spearheading sustainable and reliable power grid operations, this dissertation develops a multi-stakeholder approach to power grid operation design; aiming to address economic, security, and environmental challenges of the constrained electricity generation. It investigates the role of Electric Vehicle (EV) fleets integration, as distributed and mobile storage assets to support high penetrations of renewable energy sources, in the power grid. The vehicle-to-grid (V2G) concept is considered to demonstrate the bidirectional role of EV fleets both as a provider and consumer of energy in securing a sustainable power grid operation. The proposed optimization modeling is the application of Mixed-Integer Linear Programing (MILP) to large-scale systems to solve the hourly security-constrained unit commitment (SCUC) -- an optimal scheduling concept in the economic operation of electric power systems. The Monte Carlo scenario-based approach is utilized to evaluate different scenarios concerning the uncertainties in the operation of power grid system. Further, in order to expedite the real-time solution of the proposed approach for large-scale power systems, it considers a two-stage model using the Benders Decomposition (BD). The numerical simulation demonstrate that the utilization of smart EV fleets in power grid systems would ensure a sustainable grid operation with lower carbon footprints, smoother integration of renewable sources, higher security, and lower power grid operation costs. The results, additionally, illustrate the effectiveness of the proposed MILP approach and its potentials as an optimization tool for sustainable operation of large scale electric power systems.

Haddadian, Ghazale J.

401

Toward sustainable energy development in the Indian power sector: A critique of fifty years of power development in India and an analysis of sustainable energy alternatives  

NASA Astrophysics Data System (ADS)

At present, the Indian electric power sector (EPS) finds itself in a "triple bind," plagued by a severe resource crunch, adverse environmental impacts and unequal social access to energy services, and a poor record of technical performance in generation and distribution of electricity. The problems of the EPS are seen in this dissertation as manifestations of a larger crisis of unsustainable energy development, rooted in the political economy of power development in India. A theoretical framework is articulated based on a political economy approach constructed for this dissertation. The political economy framework is comprised of three elements: a materialization thesis that describes the core social relations in support of a specific political and economic structure; an institutionalization thesis that describes how these material relations are reproduced; and an ideology thesis which argues that a pervasive ideology exists making intelligible the existence of a particular form of political economy. From the vantage-point of this framework, and through a detailed examination of the political history of the power sector in India, the crisis in the Indian power sector is linked to the contradictions of what is termed as the "conventional model of energy development" (CMED) embraced by Indian planners at the time of independence. It is argued that the crisis in the EPS is caused by the intensive bureaucratization and technicization of the system, all but removing it from social and environmental evaluation. Current policy prescriptions for the Indian EPS, both Western as well as domestic, call for further strengthening the technocratic construct of the EPS. Privatization and restructuring experiments, underway in India, rather than breaking away from the existing approach, actually deepen the institutional hold of the CMED. Sustainable energy development (SED) is examined as an alternative to the CMED. The meaning and relevance of this concept in the context of the Indian EPS are examined, and guideposts to sustainability are identified. Linking SED back to the political economy framework, it is argued that if the concept is to signify a real departure from the current EPS, ideological, material and institutional changes will be required. These changes will result not only in a transformation of technology, but in a reconstruction of the energy system, from its values and philosophy to its social, political, economic, and environmental relations.

Govindarajalu, Chandrasekhar

402

Develop and test fuel cell powered on-site integrated total energy systems: Phase 3: Full-scale power plant development  

NASA Technical Reports Server (NTRS)

The development of a commercially viable and cost-effective phospheric acid fuel cell powered on-site integrated energy system (OS/IES) is described. The fuel cell offers energy efficients in the range of 35-40% of the higher heating value of available fuels in the form of electrical energy. In addition, by utilizing the thermal energy generated for heating, ventilating and air-conditioning (HVAC), a fuel cell OS/IES could provide total energy efficiencies in the neighborhood of 80%. Also, the Engelhard fuel cell OS/IES offers the important incentive of replacing imported oil with domestically produced methanol, including coal-derived methanol.

1982-01-01

403

Prospects of development of the power industry in the zone of influence of the transcontinental railroad  

SciTech Connect

The authors examine the possibilities of developing a power industry in the zone of influence of the transcontinental railroad (TCR). Two aspects of development are studied in particular: (1) the electric power supply for construction and subsequently for the operating railroad in coordination with simultaneous provision for the needs of adjacent regions; (2) the construction of a transcontinental transmission line with the use of a tunnel and railroad for its construction and with the creation of a unified transport--power corridor. Of great interest are the possibilities of constructing hydrostations in regions of the Sakha Republic (Yakutia), Chukchi Peninsula, and in the southern part of the Magadan region. The route of the proposed main line is located in the zone of influence of a number of prospective hydropower installations. 2 tabs.

Fel`dman, B.N.; Luk`yanov, V.A.

1994-02-01

404

Development of Digital Materials Database for Design and Construction of New Power Plants  

SciTech Connect

To facilitate materials selection, structural design, and future maintenance of the Generation IV nuclear reactor systems, an interactive, internet accessible materials property database, dubbed Gen IV Materials Handbook, has been under development with the support of the United States Department of Energy. The Handbook will provide an authoritative source of information on structural materials needed for the development of various Gen IV nuclear reactor systems along with powerful data analysis and management tools. In this paper, the background, history, framework, major features, contents, and development strategy of the Gen IV Materials Handbook are discussed. Current development status and future plans are also elucidated.

Ren, Weiju [ORNL

2008-01-01

405

Development of a PEMFC Power System with Integrated Balance of Plant  

NASA Technical Reports Server (NTRS)

Autonomous Underwater Vehicles (AUV s) have received increasing attention in recent years as military and commercial users look for means to maintain a mobile and persistent presence in the undersea world. Compact, neutrally buoyant power systems are needed for both small and large vehicles. Batteries are usually employed in these applications, but the energy density and therefore the mission duration are limited with current battery technology. At a certain energy or mission duration requirement, other means to get long duration power become feasible. For example, above 10 kW-hrs liquid oxygen and hydrogen have better specific energy than batteries and are preferable for energy storage as long as a compact system of about 100 W/liter is achievable to convert the chemical energy in these reactants into power. Other reactant forms are possible, such as high pressure gas, chemical hydrides or oxygen carriers, but it is essential that the power system be small and light weight. Recent fuel cell work, primarily focused on NASA applications, has developed power systems that can meet this target power density. Passive flow-through systems, using ejector driven reactant (EDR) flow, integrated into a compact balance of plant have been developed. These systems are thermally and functionally integrated in much the same way as are automotive, air breathing fuel cell systems. These systems fit into the small volumes required for AUV and future NASA applications. Designs have been developed for both a 21" diameter and a larger diameter (LD) AUV. These fuel cell systems occupy a very small portion of the overall energy system, allowing most of the system volume to be used for the reactants. The fuel cell systems have been optimized to use reactants efficiently with high stack efficiency and low parasitic losses. The resulting compact, highly efficient fuel cell system provides exceptional reactant utilization and energy density. Key design variables and supporting test data are presented. Future development activities are described.

Wynne, B.; Diffenderfer, C.; Ferguson, S.; Keyser, J.; Miller, M.; Sievers, B.; Ryan, A.; Vasquez, A.

2012-01-01

406

Development of a catalytic silicon micro-combustor for hydrocarbon-fueled power MEMS  

Microsoft Academic Search

This paper reports the development of a high efficiency, hydrocarbon-fueled micro-combustion system for a microscale gas turbine engine for power generation and micro-propulsion applications. A three-wafer catalytic combustor was fabricated and tested. Efficiencies in excess of 40% were achieved for ethylene-air and propane-air combustion. A fabrication process for a six-wafer catalytic combustor was developed and this device was successfully constructed

C. M. Spadaccini; X. Zhangt; C. P. CadouS; N. Miki; I. A. Waitz

2002-01-01

407

Progress on the Development of High-Power Solid-State Lasers for Directed Energy Applications  

Microsoft Academic Search

The High Energy Laser Joint Technology Office (HEL-JTO) was established in 2000 for the purpose of developing and executing a comprehensive investment strategy for HEL science and technology that would underpin weapons development. Recent progress in diode-pumped solid-state lasers has significantly enhanced the performance of solid-state lasers for higher efficiency and higher average power output. The high reliability and high

M. Neice; J. Slater; S. Mani

2007-01-01

408

Development of Lithium-ion Battery as Energy Storage for Mobile Power Sources Applications  

Microsoft Academic Search

In view of the need to protect the global environment and save energy, there has been strong demand for the development of lithium-ion battery technology as a energy storage system, especially for Light Electric Vehicle (LEV) and electric vehicles (EV) applications. The R&D trend in the lithium-ion battery development is toward the high power and energy density, cheaper in price

Mohd Ali Sulaiman; Hasimah Hasan

2009-01-01

409

Development of advanced SQUID system for nondestructive evaluation of material degradation in power plants  

SciTech Connect

A newer and more advanced version of the SQUID sensor system for estimating the degradation of materials in power plants have been developed. The miniaturized SQUID sensor developed for nondestructive measurement is 262 mm high, 152 mm in diameter, and 5 kg in weight, making it only one-twelfth the size and one-tenth the weight of a conventional SQUID sensor. Tests have demonstrated that the new SQUID sensor can successfully estimate fatigue damage in Type 316 stainless steel.

Otaka, M.; Hayashi, E. [Hitachi, Ltd., Ibaraki (Japan)

1995-08-01

410

Optimization of regional development under limited powers of the nature-regenerating and innovation sectors  

Microsoft Academic Search

Consideration was given to optimization of the regional development strategy with the use of an aggregated ecologo-economic\\u000a model allowing for the constraints on the nature-regenerating and innovation powers. The control actions were represented\\u000a by presumably unlimited investments providing as the result a turnpike solution meeting the stable development criterion.\\u000a Realization of the solution was described, and a numerical example presented.

Ni Ming Kang; I. S. Guseva

2011-01-01

411

Development of a Hybrid Knowledge-Based System for Multiobjective Optimization of Power Distribution System Operations  

Microsoft Academic Search

The development of a hybrid knowledge-based system with a coupling between knowledge-based and numerical methods for multiobjective optimization of power distribution operations is described. The advantages of a hybrid knowledge-based system are described followed by the system objectives, means of control, and constraints. A framework is provided that describes the necessary development stages of a commercial knowledge-based package. An overview

Robert J. Sárfi; A. M. G. Solo

2005-01-01

412

Development and fabrication of improved Schottky power diodes, phases I and II  

NASA Technical Reports Server (NTRS)

Reproducible methods for the fabrication of silicon Schottky diodes were developed for the metals tungsten, aluminum, conventional platinum silicide and low temperature platinum silicide. Barrier heights and barrier lowering were measured permitting the accurate prediction of ideal forward and reverse diode performance. Processing procedures were developed which permit the fabrication of large area (approximately 1 sqcm) mesa-geometry power Schottky diodes with forward and reverse characteristics that approach theoretical values.

Cordes, L. F.; Garfinkle, M.; Taft, E. A.

1974-01-01

413

FINAL TECHNICAL REPORT Project Title: Environmental Impacts of Wind Power Development on the Population Biology  

E-print Network

University, Manhattan, Kansas 66506, plowe@ksu.edu, 785 532-6804 Other Project Team Members Samantha M, Manhattan, Kansas 66506, lmhunt@k-state.edu, 785-532-6653 Project Oversight from National Wind Coordinatingi FINAL TECHNICAL REPORT Project Title: Environmental Impacts of Wind Power Development

Sandercock, Brett K.

414

Development of energy-saving elevator using regenerated power storage system  

Microsoft Academic Search

Various measures have been strongly focused upon to prevent global environmental problems. One of them has been the development of energy saving methods for electrical apparatus. In contrast, a standard elevator with a diode rectifier consumes regenerated power from its electric motor as heat in resistors. As a result, the entire elevator system suffers a remarkable energy loss. This paper

S. Tominaga; I. Suga; H. Araki; H. Ikejima; M. Kusuma; K. Kobayashi

2002-01-01

415

Conventional and Explosive Pulsed Power Development at Texas A&m University  

NASA Astrophysics Data System (ADS)

A new capability for performing conventional and explosive pulsed power programs is being developed at Texas A&M University (TAMU), through the Texas Engineering Experiment Station of the TAMU System. The primary machine being installed in this facility is a low inductance, ~460 kJ, 60 kV capacitor bank. Flexibility to support different loads is being designed into this system, as is the ability to disconnect experiments from the laboratory machine for testing at the explosive pulsed power test site. Initial experiments will be conducted using a plasma focus as the load, with this low inductance, high-current capacitor bank as a driver. We expect to realize peak currents of 3 to 4 MA in the plasma focus. Potential applications include pulsed neutron source studies, intense X-ray production development for possible commercial applications, and high-energy-density plasma science investigations. Other potential loads for this capacitor bank include magnetohydrodynamic plasma accelerators and systems that may be of interest to magnetized fusion energy experiments. The proposed site for the explosive pulsed power facility on the TAMU Riverside Campus has been experimentally qualified. We anticipate that with a fully developed facility that incorporates blast, shrapnel, and acoustic mitigation measures, experiments containing 22.7 kg of explosive will be reasonable. Presently, parts are available to assemble a power source for potential explosive generator development and application shots.

Freeman, B.; Faleski, T.; Hamilton, I.; Rock, J.; Parish, T.

2004-11-01

416

The Development of a Highly Reliable Power Management and Distribution System for Civil Transport Aircraft  

NASA Technical Reports Server (NTRS)

NASA is pursuing a program in Advanced Subsonic Transport (AST) to develop the technology for a highly reliable Fly-By-Light/Power-By-WIre aircraft. One of the primary objectives of the program is to develop the technology base for confident application of integrated PBW components and systems to transport aircraft to improve operating reliability and efficiency. Technology will be developed so that the present hydraulic and pneumatic systems of the aircraft can be systematically eliminated and replaced by electrical systems. These motor driven actuators would move the aircraft wing surfaces as well as the rudder to provide steering controls for the pilot. Existing aircraft electrical systems are not flight critical and are prone to failure due to Electromagnetic Interference (EMI) (1), ground faults and component failures. In order to successfully implement electromechanical flight control actuation, a Power Management and Distribution (PMAD) System must be designed having a reliability of 1 failure in 10(exp +9) hours, EMI hardening and a fault tolerance architecture to ensure uninterrupted power to all aircraft flight critical systems. The focus of this paper is to analyze, define, and describe technically challenging areas associated with the development of a Power By Wire Aircraft and typical requirements to be established at the box level. The authors will attempt to propose areas of investigation, citing specific military standards and requirements that need to be revised to accommodate the 'More Electric Aircraft Systems'.

Coleman, Anthony S.; Hansen, Irving G.

1994-01-01

417

A Development of the Mobile Computing System for Repair and Patrol of Electric Power Facilities  

Microsoft Academic Search

As the wireless communicationon networks are distributed in the wide areas and the use of portable terminals is getting popular, the mobile computing technologies are being developed rapidly. Moreover, in most electricity power corporations, the GIS (Geographic Information System) database system had been established so as to connect repair works with topological information. Unfortunately, it is not connected with distribution

Jin-Ho Shin; Bong-Jae Yi; Jae-Ju Song; Ju-Young Kang; Jung-Il Lee; Seon-Ku Cho

2005-01-01

418

Development and testing of a hydraulic powered diver operated rock drill and sea floor fasteners  

Microsoft Academic Search

The Civil Engineering Laboratory has developed a hand held diver operated rock drill. The drill is hydraulically powered thus eliminating the percussion and visibility problems associated with the underwater use of pneumatic rock drills. Capable of drilling holes up to 2-1\\/2 inches in diameter and 18 inches deep, the hydraulic rock drill has been used to install various seafloor fasteners

R. Brackett

1975-01-01

419

Development Status of Power Processing Unit For 250mN-class Hall Thruster  

Microsoft Academic Search

Mitsubishi Electric Corporation (MELCO) has been developing the next generation ion engine under the contract of Unmanned Space experiment Free Flyer (USEF) and Ministry of Economic, Trade and Industry (METI) for six years. The final target performance is that the thrust level is more than 250mN, specific impulse is more than 1500 sec under supplying the electric power less than

Hiroyuki Osuga; Kentaro Suzuki; Toshiyuki Ozaki; Takafumi Nakagawa; Ikuro Sug; Taichiro Tamida; Yoshiyuki Akuzawa; Fumitoshi Sog; Hirokazu Suzuki

420

Development of a Method of Selecting Important Alarms for Nuclear Power Plants  

Microsoft Academic Search

Presenting important alarms selected from a large number of activated alarms provides useful operational support under a transient status in a nuclear power plant. We have developed an alarm processing method which selects and presents important alarms depending on plant status.In this method, important alarms are selected, first, based on physical relationships between alarms and component status including alarms themselves

Setsuo ARITA; Yukiharu OHGA; Yohichi YOSHIDA; Tadahiro YUDATE; Yu AOKI

1995-01-01

421

Developing guidelines for design and procedure changes in nuclear power plants  

Microsoft Academic Search

The Nuclear Safety Analysis Center (NSAC) of the Electric Power Research Institute initiated a program with MPR Associates to study the design change process used by utilities when making design changes to a nuclear plant and to develop a set of recommended guidelines for utility use in the design and review of these design changes. Of particular interest are those

J. W. Johnson; W. B. Reuland

1987-01-01

422

Biomass power for rural development: Phase 2. Technical progress report, April 1--June 30, 1998  

SciTech Connect

The project undertaken by the Salix Consortium is a multi-phased, multi-partner endeavor. Phase-1 focused on initial development and testing of the technology and agreements necessary to demonstrate commercial willow production in Phase-2. The Phase-1 objectives have been successfully completed: preparing final design plans for two utility pulverized coal boilers, developing fuel supply plans for the project, obtaining power production commitments from the power companies for Phase-2, obtaining construction and environmental permits, and developing an experimental strategy for crop production and power generation improvements needed to assure commercial success. The R and D effort also addresses environmental issues pertaining to introduction of the willow energy system. Beyond those Phase-1 requirements the Consortium has already successfully demonstrated cofiring at Greenidge Station and developed the required nursery capacity for acreage scale-up. This past summer 105 acres were prepared in advance for the spring planting in 1998. Having completed the above tasks, the Consortium is well positioned to begin Phase-2. In phase-2 every aspect of willow production and power generation from willow will be demonstrated. The ultimate objective of Phase-2 is to transition the work performed under the Rural Energy for the Future project into a thriving, self-supported energy crop enterprise.

Neuhauser, E.

1998-11-01

423

Participation and Power: Reflections on the Role of Government in Land Use Planning and Rural Development  

ERIC Educational Resources Information Center

Purpose: To examine the role of power in interactive policymaking settings. Design/Methodology/Approach: A literature study is combined with four case studies relating to citizen participation in natural resource management and rural development in the Netherlands. Findings: Many of the identified problems and dilemmas of interactive policymaking…

Aarts, Noelle; Leeuwis, Cees

2010-01-01

424

77 FR 5545 - Commercial Leasing for Wind Power Development on the Outer Continental Shelf (OCS) Offshore...  

Federal Register 2010, 2011, 2012, 2013, 2014

...BOEM-2011-0093] Commercial Leasing for Wind Power Development on the Outer Continental...lessee to propose the construction of a wind energy project(s) on the OCS offshore...interest in the acquisition of commercial wind lease(s) in some or all of...

2012-02-03

425

Possible Effects of Tidal Power Development in the Upper Bay of Fundy On Anadromous Fish Passage  

Microsoft Academic Search

This report summarizes some of the probable negative effects of a tidal power barrage in the upper Bay of Fundy on the passage and hence maintenance of anadromous fish in freshwater streams embraced by the development. The predicted negative impacts are based mainly on supporting research conducted in freshwater and estuarine situations, since studies of fish passage at marine obstructions

J. R. Semple

426

Development of new-generation pumps for the feed system of large power units  

NASA Astrophysics Data System (ADS)

Main results from design developments of a sequential totality of condensate, booster, and feed pumps for thermal power units of the gigawatt class are described. The presented design solutions are innovative in nature and are aimed at achieving better energy efficiency, higher reliability, and longer service life of the main-cycle pumps.

Morgunov, G. M.

2013-02-01

427

Development of a checklist for evaluating emergency procedures used in nuclear power plants  

Microsoft Academic Search

This report describes the process for developing a checklist to be used by US Nuclear Regulatory Commission Office of Inspection and Enforcement (I and E) inspectors during their evaluation of emergency procedures used in nuclear power plants. The objective of the checklist is to aid inspectors in identifying procedural characteristics that can lead to reactor operator performance deviations. Four nuclear

R. L. Brune; M. Weinstein

1981-01-01

428

Development of In-service Inspection techniques for nuclear power plants in India  

Microsoft Academic Search

Nondestructive Evaluation (NDE) plays a major role in ensuring the safe and reliable operation of Pressurised Heavy Water Reactors (PHWRs) which are the mainstays of the nuclear power programme in India. This paper discusses the significant developments made over the last two decades which have contributed towards establishing novel methodologies and techniques for In-service Inspection (ISI). The techniques covered are

Baldev Raj

1997-01-01

429

Development of a human and robot collaborative system for inspecting patrol of nuclear power plants  

Microsoft Academic Search

The objective of this study is to develop the human-and-robot collaborative system for the patrol of nuclear power plants. The proposed arrangement is that in normal situations the robot takes an autonomous action, while in abnormal situations the human assists the robot in solving the problem. The system has a great ability for coping with unexpected events and improving the

N. Ishikawa; K. Suzuki

1997-01-01

430

Workshop: Research and development plans for high power spallation neutron testing at BNL  

SciTech Connect

This report consists of vugraphs from presentations at the meeting. The papers covered the following topics: (1) APS as a proton source; (2) target status for NSNS (National Spallation Neutron Source); (3) spallation neutron source in Japan; (4) liquid LiBi flow loop; and (5) research and development plans for high power tests at the AGS.

NONE

1996-08-05

431

Genetic programming as a method to develop powerful predictive models for clinical diagnosis  

E-print Network

Genetic programming as a method to develop powerful predictive models for clinical diagnosis Ivar models in an optimal way. In this paper we discuss as an example the diagnostic prediction of pul- monary, Prognosis, Logistic Re- gression, Pulmonary Embolism 1. INTRODUCTION The use of predictive models

Fernandez, Thomas

432

Development of a solar-powered infrared injection laser microminiature transmitting system  

Microsoft Academic Search

A solar-powered infrared microminiature transmitting system is being developed to provide scientists with a tool to continuously track and study Africanized bees. Present tracking methods have limited ranges and lack the capability of continuously tracking individual insects. Preliminary field tests of a stationary prototypic transmitter have demonstrated a range of 1.1 km. The basic design consists of an array of

D. D. Falter; G. T. Alley; K. G. Falter; J. M. Rochelle; K. H. Valentine; R. D. Westbrook; G. E. Jellison Jr.; P. H. Fleming

1989-01-01

433

Development and research on fault diagnosis system of solar power tower plants  

Microsoft Academic Search

According to the system configuration and operating characteristic of a constructing solar power tower (SPT) plant in China in this paper, the fault diagnosis system (FDS) was researched and developed. Furthermore, evaluation system of fault grade was established by the method of fuzzy comprehensive evaluation. In this FDS, the fault diagnosis structure was designed to adopt the expert system for

D. Y. Liu; T. Z. Guo; S. Guo; D. S. Wan; C. Xu; W. Huang

2009-01-01

434

Programme A. Nuclear Power Subprogramme A.4 Technology Development for Advanced Reactor Lines  

E-print Network

and the economic merits of centralized versus distributed production units. #12;Page 2 Programme B. Nuclear FuelProgramme A. Nuclear Power Subprogramme A.4 Technology Development for Advanced Reactor Lines data for heat transfer; pressure drop, blowdown, natural circulation and stability for conditions

De Cindio, Fiorella

435

DESIGN AND DEVELOPMENT OF A POWER CONDITIONING UNIT FOR AN EARTH OBSERVATION MICROSATELLITE  

Microsoft Academic Search

The microsatellite project of the Universities of Naples (SMART) is aimed for the design and development of a small size and mass satellite, but with all functionality foreseen for larger ones. This led to the design of a 28V, fully-regulated bus. Voltage control logic is based on a shunt regulator, which requires a minimum power consumption of 2W. In order

Marco D'Errico; Massimiliano Pastena; Gioia Perrone

436

Development of a solar-powered residential air conditioner. Program review  

NASA Technical Reports Server (NTRS)

Progress in the effort to develop a residential solar-powered air conditioning system is reported. The topics covered include the objectives, scope and status of the program. The results of state-of-art, design, and economic studies and component and system data are also presented.

1975-01-01

437

Development of solid state pulse power modulator using toroidal amorphous core  

Microsoft Academic Search

This paper discusses the experiments conducted for the development of 50 kV, 10 A, 10 mus duration, and rise time of 2 mus solid state pulse power modulator using toroidal amorphous steel core and low cost IGBT switches. The experiments revealed (i) the need for new design methodologies based on energy transfer between the electrical and magnetic systems and (ii)

H. A. Mangalvedekar; K. P. Dixit; D. N. Barve; A. S. Paithankar; D. P. Chakravarthy

2009-01-01

438

Innovative Approaches to Development and Ground Testing of Advanced Bimodal Space Power and Propulsion Systems  

SciTech Connect

The last major development effort for nuclear power and propulsion systems ended in 1993. Currently, there is not an initiative at either the National Aeronautical and Space Administration (NASA) or the U.S. Department of Energy (DOE) that requires the development of new nuclear power and propulsion systems. Studies continue to show nuclear technology as a strong technical candidate to lead the way toward human exploration of adjacent planets or provide power for deep space missions, particularly a 15,000 lbf bimodal nuclear system with 115 kW power capability. The development of nuclear technology for space applications would require technology development in some areas and a major flight qualification program. The last major ground test facility considered for nuclear propulsion qualification was the U.S. Air Force/DOE Space Nuclear Thermal Propulsion Project. Seven years have passed since that effort, and the questions remain the same, how to qualify nuclear power and propulsion systems for future space flight. It can be reasonable assumed that much of the nuclear testing required to qualify a nuclear system for space application will be performed at DOE facilities as demonstrated by the Nuclear Rocket Engine Reactor Experiment (NERVA) and Space Nuclear Thermal Propulsion (SNTP) programs. The nuclear infrastructure to support testing in this country is aging and getting smaller, though facilities still exist to support many of the technology development needs. By renewing efforts, an innovative approach to qualifying these systems through the use of existing facilities either in the U.S. (DOE's Advance Test Reactor, High Flux Irradiation Facility and the Contained Test Facility) or overseas should be possible.

Hill, Thomas Johnathan; Noble, Cheryl Ann; Noble, C.; Martinell, John Stephen; Borowski, S.

2000-07-01

439

Innovation Approaches to Development and Ground Testing of Advanced Bimodal Space Power and Propulsion Systems  

SciTech Connect

The last major development effort for nuclear power and propulsion systems ended in 1993. Currently, there is not an initiative at either the National Aeronautical and Space Administration (NASA) or the U.S. Department of Energy (DOE) that requires the development of new nuclear power and propulsion systems. Studies continue to show nuclear technology as a strong technical candidate to lead the way toward human exploration of adjacent planets or provide power for deep space missions, particularly a 15,000 lbf bimodal nuclear system with 115 kW power capability. The development of nuclear technology for space applications would require technology development in some areas and a major flight qualification program. The last major ground test facility considered for nuclear propulsion qualification was the U.S. Air Force/DOE Space Nuclear Thermal Propulsion Project. Seven years have passed since that effort, and the questions remain the same, how to qualify nuclear power and propulsion systems for future space flight. It can be reasonably assumed that much of the nuclear testing required to qualify a nuclear system for space application will be performed at DOE facilities as demonstrated by the Nuclear Rocket Engine Reactor Experiment (NERVA) and Space Nuclear Thermal Propulsion (SNTP) programs. The nuclear infrastructure to support testing in this country is aging and getting smaller, though facilities still exist to support many of the technology development needs. By renewing efforts, an innovative approach to qualifying these systems through the use of existing facilities either in the U.S. (DOE's Advance Test Reactor, High Flux Irradiation Facility and the Contained Test Facility) or overseas should be possible.

Hill, T.; Noble, C.; Martinell, J. (INEEL); Borowski, S. (NASA Glenn Research Center)

2000-07-14

440

Potential of wind power projects under the Clean Development Mechanism in India  

PubMed Central

Background So far, the cumulative installed capacity of wind power projects in India is far below their gross potential (? 15%) despite very high level of policy support, tax benefits, long term financing schemes etc., for more than 10 years etc. One of the major barriers is the high costs of investments in these systems. The Clean Development Mechanism (CDM) of the Kyoto Protocol provides industrialized countries with an incentive to invest in emission reduction projects in developing countries to achieve a reduction in CO2 emissions at lowest cost that also promotes sustainable development in the host country. Wind power projects could be of interest under the CDM because they directly displace greenhouse gas emissions while contributing to sustainable rural development, if developed correctly. Results Our estimates indicate that there is a vast theoretical potential of CO2 mitigation by the use of wind energy in India. The annual potential Certified Emissions Reductions (CERs) of wind power projects in India could theoretically reach 86 million. Under more realistic assumptions about diffusion of wind power projects based on past experiences with the government-run programmes, annual CER volumes by 2012 could reach 41 to 67 million and 78 to 83 million by 2020. Conclusion The projections based on the past diffusion trend indicate that in India, even with highly favorable assumptions, the dissemination of wind power projects is not likely to reach its maximum estimated potential in another 15 years. CDM could help to achieve the maximum utilization potential more rapidly as compared to the current diffusion trend if supportive policies are introduced. PMID:17663772

Purohit, Pallav; Michaelowa, Axel

2007-01-01

441

Simulation and Control Lab Development for Power and Energy Management for NASA Manned Deep Space Missions  

NASA Technical Reports Server (NTRS)

The development of distributed hierarchical and agent-based control systems will allow for reliable autonomous energy management and power distribution for on-orbit missions. Power is one of the most critical systems on board a space vehicle, requiring quick response time when a fault or emergency is identified. As NASAs missions with human presence extend beyond low earth orbit autonomous control of vehicle power systems will be necessary and will need to reliably function for long periods of time. In the design of autonomous electrical power control systems there is a need to dynamically simulate and verify the EPS controller functionality prior to use on-orbit. This paper presents the work at NASA Glenn Research Center in Cleveland, Ohio where the development of a controls laboratory is being completed that will be utilized to demonstrate advanced prototype EPS controllers for space, aeronautical and terrestrial applications. The control laboratory hardware, software and application of an autonomous controller for demonstration with the ISS electrical power system is the subject of this paper.

McNelis, Anne M.; Beach, Raymond F.; Soeder, James F.; McNelis, Nancy B.; May, Ryan; Dever, Timothy P.; Trase, Larry

2014-01-01