WorldWideScience

Sample records for buses

  1. COMPARISON OF CLEAN DIESEL BUSES TO CNG BUSES

    Energy Technology Data Exchange (ETDEWEB)

    Lowell, D.; Parsley, W.; Bush,C; Zupo, D.

    2003-08-24

    Using previously published data on regulated and unregulated emissions, this paper will compare the environmental performance of current generation transit buses operated on compressed natural gas (CNG) to current generation transit buses operated on ultra low sulfur diesel fuel (ULSD) and incorporating diesel particulate filters (DPF). Unregulated emissions evaluated include toxic compounds associated with adverse health effects (carbonyl, PAH, NPAH, benzene) as well as PM particle count and size distribution. For all regulated and unregulated emissions, both technologies are shown to be comparable. DPF equipped diesel buses and CNG buses have virtually identical levels of PM mass emissions and particle number emissions. DPF-equipped diesel buses have lower HC and CO emissions and lower emissions of toxic substances such as benzene, carbonyls and PAHs than CNG buses. CNG buses have lower NOx emissions than DPF-equipped buses, though CNG bus NOx emissions are shown to be much more variable. In addition, this paper will compare the capital and operating costs of CNG and DPF-equipped buses. The cost comparison is primarily based on the experience of MTA New York City Transit in operating CNG buses since 1995 and DPF-equipped buses fueled with ULSD since 2001. Published data on the experience of other large transit agencies in operating CNG buses is used to validate the NYCT experience. The incremental cost (compared to ''baseline'' diesel) of operating a typical 200-bus depot is shown to be six times higher for CNG buses than for ''clean diesel'' buses. The contributors to this increased cost for CNG buses are almost equally split between increased capital costs for purchase of buses and installation of fueling infrastructure, and increased operating costs for purchase of fuel, bus maintenance, and fuel station maintenance.

  2. Processor arrays with asynchronous TDM optical buses

    Science.gov (United States)

    Li, Y.; Zheng, S. Q.

    1997-04-01

    We propose a pipelined asynchronous time division multiplexing optical bus. Such a bus can use one of the two hardwared priority schemes, the linear priority scheme and the round-robin priority scheme. Our simulation results show that the performances of our proposed buses are significantly better than the performances of known pipelined synchronous time division multiplexing optical buses. We also propose a class of processor arrays connected by pipelined asynchronous time division multiplexing optical buses. We claim that our proposed processor array not only have better performance, but also have better scalabilities than the existing processor arrays connected by pipelined synchronous time division multiplexing optical buses.

  3. School Buses & Seat Belts: A Discussion.

    Science.gov (United States)

    Alaska State Dept. of Education, Juneau.

    Safety belts are not installed in school buses for several reasons. School buses are constructed differently from automobiles in terms of (1) the locations of doors and instrument panels relative to passengers, (2) outer construction, (3) seat design and padding, and (4) visibility on the road. Under current regulations, bus seats are constructed…

  4. Clean School Bus USA: Tomorrow's Buses for Today's Children

    Science.gov (United States)

    US Environmental Protection Agency, 2010

    2010-01-01

    The U.S. Environmental Protection Agency (EPA) is ensuring that all new buses meet tighter standards developed to reduce diesel emissions and improve safety. Today's new buses are cleaner--60 times cleaner than buses built before 1990--and feature additional emergency exits, improved mirror systems, and pedestrian safety devices. But replacing…

  5. The New Energy Buses in China

    DEFF Research Database (Denmark)

    Wang, Jingyu; Liu, Yingqi; Kokko, Ari

    2013-01-01

    With the advent of “low carbon” economy, new energy vehicles are increasingly favored by the Chinese government and manufacturers. New energy buses have become an important channel for the promotion of new energy utilizations. Based on the summary of policies, this paper conducts a thorough resea...... price. We draw the conclusions that clear direction and detailed plans will enhance the new energy bus promotion and rising oil prices will promote new energy buses as well.......With the advent of “low carbon” economy, new energy vehicles are increasingly favored by the Chinese government and manufacturers. New energy buses have become an important channel for the promotion of new energy utilizations. Based on the summary of policies, this paper conducts a thorough...... research on the technology and promotion achievements on new energy buses. We have found that the promotion achievements have difference with plans and gaps exist in different cities. In the paper we discuss the policy efficiency, the correlation between achievements, policies and the influence from oil...

  6. Seat Belts on School Buses: Some Considerations.

    Science.gov (United States)

    Soule, David

    1982-01-01

    A representative of the National Highway Traffic Safety Administration weighs advantages and discusses issues associated with installing seat belts in school buses. Federal regulations and research findings are considered. A list of guideline questions for school districts planning to install seat belts is included. (PP)

  7. The School Busing Controversy: 1970-75.

    Science.gov (United States)

    Buncher, Judith F., Ed.

    Even though transportation of school children was long accepted by the public prior to the conflict over school integration, the school bus became a symbol representing the divergent emotions of both the integrationists and the supporters of "neighborhood schools." Busing was used as a means of overcoming the resistance and procrastination of…

  8. A Busing Program for Child Patients.

    Science.gov (United States)

    Richardson, Alan S.; Hung, John T.

    1991-01-01

    The University of British Columbia (Canada) dental school has implemented a clinical experience program in which children in grades 2-4 are bused to the university for dental treatment. The program has helped maintain undergraduate pediatric dental experiences, benefited the children's dental health, and cost parents less than traditional dental…

  9. Project Startup: Evaluating the Performance of Electric Buses

    Energy Technology Data Exchange (ETDEWEB)

    2016-04-01

    The National Renewable Energy Laboratory (NREL) is evaluating the in-service performance of fast-charge battery electric buses compared to compressed natural gas (CNG) buses operated by Foothill Transit in West Covina, California. Launched in 2015 in collaboration with the California Air Resources Board, this study aims to improve understanding of the overall use and effectiveness of fast-charge electric buses and associated charging infrastructure in transit operation.

  10. How Busing Burdened Blacks: Critical Race Theory and Busing for Desegregation in Nashville-Davidson County

    Science.gov (United States)

    Woodward, Jennifer R.

    2011-01-01

    This article uses critical race theory, court opinions, newspapers, and interviews to explain how the burden of busing for desegregation was placed upon Blacks in Nashville, Tennessee and why the agenda of the litigants in the Kelley v. Metropolitan Board of Education cases shifted over time. The deliberate pace of the initial desegregation…

  11. Communication Buses and Protocols for Sensor Networks

    Directory of Open Access Journals (Sweden)

    Andrew Mason

    2002-07-01

    Full Text Available This paper overviews existing digital communication buses which are commonly used in sensor networks, discusses sensor network architectures, and introduces a new sensor bus for low power microsystem applications. The new intra-module multi-element microsystem (IM2 bus is nine-line interface with 8b serial data which implements several advanced features such as power management and plug-n-play while maintaining minimum hardware overhead at the sensor node. Finally, some issues in wireless sensor networking are discussed. The coverage of these issues provides a guideline for choosing the appropriate bus for different sensor network applications.

  12. Alameda-Contra Costa Transit District (AC Transit) Fuel Cell Transit Buses: Preliminary Evaluation Results

    Energy Technology Data Exchange (ETDEWEB)

    Chandler, K.; Eudy, L.

    2007-03-01

    This report provides an evaluation of three prototype fuel cell-powered transit buses operating at AC Transit in Oakland, California, and six baseline diesel buses similar in design to the fuel cell buses.

  13. School Buses Answer Calls for Help in Crises

    Science.gov (United States)

    Borja, Rhea R.

    2005-01-01

    Five days after Hurricane Katrina struck New Orleans, a convoy of 142 air-conditioned school buses from the 209,000-student Texas district rumbled to life. Loaded with food and bottled water, staffed by 350 school employees, and accompanied by bus-repair trucks and a phalanx of school police cars, the yellow buses traveled all night to reach the…

  14. 46 CFR 111.30-19 - Buses and wiring.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 4 2010-10-01 2010-10-01 false Buses and wiring. 111.30-19 Section 111.30-19 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) ELECTRICAL ENGINEERING ELECTRIC SYSTEMS-GENERAL REQUIREMENTS Switchboards § 111.30-19 Buses and wiring. (a) General. Each bus must meet the requirements...

  15. Dynamic Extra Buses Scheduling Strategy in Public Transport

    Directory of Open Access Journals (Sweden)

    Bin Yu

    2015-06-01

    Full Text Available This paper presents a dynamic extra buses scheduling strategy to improve the transit service of transit routes. In this strategy, in order to decide when to dispatch an extra bus, the service reliability of transit route is assessed firstly. A model aimed at maximizing the benefit of the extra buses scheduling strategy is constructed to determine how many stops extra buses need to skip from the terminal to accommodate passengers at the following stops. A heuristic algorithm is defined and implemented to estimate the service reliability of transit route and to optimize the initial stop of extra buses scheduling strategy. Finally, the strategy is tested on two examples: a simple and a real-life transit route in the Dalian city in China. The results show that the extra buses scheduling strategy based on terminal stops with a reasonable threshold can save 8.01% waiting time of passengers.

  16. Electric Buses in Urban Transport, The Situation and Development Trends

    Institute of Scientific and Technical Information of China (English)

    Jakub Slavlk

    2014-01-01

    A study called "E-mobilita v MHD" (e-mobility in urban mass transit) has been conducted by the author's private consultancy to inform Czech public transport operators about the technologies and operational experience to date and stimulate the e-bus utilization as well as their involvement in e-bus research and development projects. The study covers trolley-buses, diesel hybrids and e-buses including fuel cell buses. These electric urban buses have been compared with combustion engine vehicles represented by diesel and CNG (compressed natural gas) buses, in terms of energy consumption and cost, greenhouse gas emissions, noise and life cycle cost. Relations between urban transport e-mobility and the "smart grid" concept have been presented as well. Comprehensive reports prepared on the European Union and the USA levels have been the basis for the study, completed by information from the field research, focused especially on the bus operational reliability and other parameters important for a transport operator and covering, interalia, 12 case studies. The results show electric buses as a promising urban transport mode with massive technology development overcoming their operational limitations. Synergies between electric buses and other urban systems, such as power supply, are notable as well.

  17. King County Metro Transit Hybrid Articulated Buses: Final Evaluation Results

    Energy Technology Data Exchange (ETDEWEB)

    Chandler, K.; Walkowicz, K.

    2006-12-01

    Final technical report compares and evaluates new diesel and diesel hybrid-electric articulated buses operated as part of the King County Metro Transit (KC Metro) fleet in Seattle, Washington. The evaluation lasted 12 months.

  18. Battery buses and light hybrid buses in modern town traffic. Batteriebusse und Leichthybridbusse im modernen Stadtverkehr

    Energy Technology Data Exchange (ETDEWEB)

    Lee, R. (Neoplan Gottlob Anwaerter GmbH und Co., Stuttgart (Germany))

    1993-01-01

    Apart from the manufacture of standardised line buses, Neoplan has been intensively concerned with the development of ultra-light vehicle bodies. The individual technical steps have been tested and brought from the experimental stage to readiness for mass-production by four different types of application and 10 experimental vehicles which are used in genuine daily use in traffic concerns. 1. Battery changing technique; 2. Diesel-electric power transmission and developing a wheel motor drive; 3. Diesel-electric power transmission with multiple energy supply (hybrid system). (orig./BWI)

  19. Evaluation of Orion/BAE Hybrid Buses and Orion CNG Buses at New York City Transit: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, L.; Barnitt, R.; Chandler, K.

    2005-05-01

    This paper prepared for the 2005 American Public Transportation Association Bus & Paratransit Conference discusses the NREL/DOE evaluation of hybrid electric transit buses operated by New York City Transit.

  20. Comparative study of the work load between one-man buses and two-man buses.

    Directory of Open Access Journals (Sweden)

    Ueno,Mitsuo

    1985-06-01

    Full Text Available The differences in physiological and safety conditions of one-man buses and two-man buses were examined from the view point of occupational fatigue. This survey consisted of a work load study which included a time study, study of subsidiary behavior, auditory task, memory test, Galvanic Skin Response (GSR and physiological function tests and a self-administered questionnaire which involved items concerning safety and subjective fatigue complaints. The visual and postural restrictions in the one-man bus were greater than in the two-man bus. The mental capacity of the one-man bus drivers was found to be less. Greater mental fatigue and stress were observed in the one-man bus. More subjective fatigue complaints were observed in the one-man bus. More cases of near accidents were observed in the one-man bus. From these results it was concluded that the one-man bus caused bus drivers a greater mental and physical work load.

  1. Particle and gaseous emissions from individual diesel and CNG buses

    Science.gov (United States)

    Hallquist, Å. M.; Jerksjö, M.; Fallgren, H.; Westerlund, J.; Sjödin, Å.

    2013-05-01

    In this study size-resolved particle and gaseous emissions from 28 individual diesel-fuelled and 7 compressed natural gas (CNG)-fuelled buses, selected from an in-use bus fleet, were characterised for real-world dilution scenarios. The method used was based on using CO2 as a tracer of exhaust gas dilution. The particles were sampled by using an extractive sampling method and analysed with high time resolution instrumentation EEPS (10 Hz) and CO2 with a non-dispersive infrared gas analyser (LI-840, LI-COR Inc. 1 Hz). The gaseous constituents (CO, HC and NO) were measured by using a remote sensing device (AccuScan RSD 3000, Environmental System Products Inc.). Nitrogen oxides, NOx, were estimated from NO by using default NO2/NOx ratios from the road vehicle emission model HBEFA3.1. The buses studied were diesel-fuelled Euro III-V and CNG-fuelled Enhanced Environmentally Friendly Vehicles (EEVs) with different after-treatment, including selective catalytic reduction (SCR), exhaust gas recirculation (EGR) and with and without diesel particulate filter (DPF). The primary driving mode applied in this study was accelerating mode. However, regarding the particle emissions also a constant speed mode was analysed. The investigated CNG buses emitted on average a higher number of particles but less mass compared to the diesel-fuelled buses. Emission factors for number of particles (EFPN) were EFPN, DPF = 4.4 ± 3.5 × 1014, EFPN, no DPF = 2.1 ± 1.0 × 1015 and EFPN, CNG = 7.8 ± 5.7 ×1015 kg fuel-1. In the accelerating mode, size-resolved emission factors (EFs) showed unimodal number size distributions with peak diameters of 70-90 nm and 10 nm for diesel and CNG buses, respectively. For the constant speed mode, bimodal average number size distributions were obtained for the diesel buses with peak modes of ~10 nm and ~60 nm. Emission factors for NOx expressed as NO2 equivalents for the diesel buses were on average 27 ± 7 g (kg fuel)-1 and for the CNG buses 41 ± 26 g (kg

  2. Particle and gaseous emissions from individual diesel and CNG buses

    Directory of Open Access Journals (Sweden)

    Å. M. Hallquist

    2013-05-01

    Full Text Available In this study size-resolved particle and gaseous emissions from 28 individual diesel-fuelled and 7 compressed natural gas (CNG-fuelled buses, selected from an in-use bus fleet, were characterised for real-world dilution scenarios. The method used was based on using CO2 as a tracer of exhaust gas dilution. The particles were sampled by using an extractive sampling method and analysed with high time resolution instrumentation EEPS (10 Hz and CO2 with a non-dispersive infrared gas analyser (LI-840, LI-COR Inc. 1 Hz. The gaseous constituents (CO, HC and NO were measured by using a remote sensing device (AccuScan RSD 3000, Environmental System Products Inc.. Nitrogen oxides, NOx, were estimated from NO by using default NO2/NOx ratios from the road vehicle emission model HBEFA3.1. The buses studied were diesel-fuelled Euro III–V and CNG-fuelled Enhanced Environmentally Friendly Vehicles (EEVs with different after-treatment, including selective catalytic reduction (SCR, exhaust gas recirculation (EGR and with and without diesel particulate filter (DPF. The primary driving mode applied in this study was accelerating mode. However, regarding the particle emissions also a constant speed mode was analysed. The investigated CNG buses emitted on average a higher number of particles but less mass compared to the diesel-fuelled buses. Emission factors for number of particles (EFPN were EFPN, DPF = 4.4 ± 3.5 × 1014, EFPN, no DPF = 2.1 ± 1.0 × 1015 and EFPN, CNG = 7.8 ± 5.7 ×1015 kg fuel−1. In the accelerating mode, size-resolved emission factors (EFs showed unimodal number size distributions with peak diameters of 70–90 nm and 10 nm for diesel and CNG buses, respectively. For the constant speed mode, bimodal average number size distributions were obtained for the diesel buses with peak modes of ~10 nm and ~60 nm. Emission factors for NOx expressed as NO2 equivalents for the diesel buses were on average 27 ± 7 g (kg fuel−1 and for the CNG buses 41

  3. RELIABILITY OF BRAKE SYSTEMS OF BUSES OF GROUP MAZ

    Directory of Open Access Journals (Sweden)

    A. Bessarab

    2013-01-01

    Full Text Available All over the world safety of maintained vehicles has the major value. For motor vehicles of the Republic of Belarus this problem is also actual. Maintenance of high reliability of brake systems of cars in operation is one of ways of the decision of a problem of increase of traffic safety.The analysis of reliability of brake systems of buses MAZ is carried out following the results of the state maintenance service in 2010 and the analysis of premature returns from routes of movement of buses MAZ-103 and МАZ-104 one of the motor transportation enterprises of a city of Minsk. Principal causes of structural parameters modification of brake pneumatic system of buses, the brake mechanism and elements АBS are considered.

  4. Reliability Evaluation Of The City Transport Buses Under Actual Conditions

    Directory of Open Access Journals (Sweden)

    Rymarz Joanna

    2015-12-01

    Full Text Available The purpose of this paper was to present a reliability comparison of two types of city transport buses. Case study on the example of the well-known brands of city buses: Solaris Urbino 12 and Mercedes-Benz 628 Conecto L used at Municipal Transport Company in Lublin was presented in details. A reliability index for the most failure parts and complex systems for the period of time failures was determined. The analysis covered damages of the following systems: engine, electrical system, pneumatic system, brake system, driving system, central heating and air-conditioning and doors. Reliability was analyzed based on Weibull model. It has been demonstrated, that during the operation significant reliability differences occur between the buses produced nowadays.

  5. RELIABILITY OF BRAKE SYSTEMS OF BUSES OF GROUP MAZ

    OpenAIRE

    A. Bessarab

    2013-01-01

    All over the world safety of maintained vehicles has the major value. For motor vehicles of the Republic of Belarus this problem is also actual. Maintenance of high reliability of brake systems of cars in operation is one of ways of the decision of a problem of increase of traffic safety.The analysis of reliability of brake systems of buses MAZ is carried out following the results of the state maintenance service in 2010 and the analysis of premature returns from routes of movement of buses M...

  6. Life Cycle Assessment of Diesel and Electric Public Transportation Buses

    Science.gov (United States)

    The Clean Air Act identifies diesel powered motor vehicles, including transit buses, as significant sources of several criteria pollutants which contribute to ground level ozone formation or smog. The effects of air pollution in urban areas are often more significant due to con...

  7. No Breathing in the Aisles: Diesel Exhaust inside School Buses.

    Science.gov (United States)

    Solomon, Gina M.; Campbell, Todd R.; Feuer, Gail Ruderman; Masters, Julie; Samkian, Artineh; Paul, Kavita Ann

    There is evidence that diesel exhaust causes cancer and premature death, and also exacerbates asthma and other respiratory illness. Noting that the vast majority of the nation's school buses run on diesel fuel, this report details a study examining the level of diesel exhaust to which children are typically exposed as they travel to and from…

  8. Particle and gaseous emissions from individual diesel and CNG buses

    Directory of Open Access Journals (Sweden)

    Å. M. Hallquist

    2012-10-01

    Full Text Available In this study size-resolved particle and gaseous emissions from 28 individual diesel-fuelled and 7 compressed natural gas (CNG-fuelled buses, selected from an in-use bus fleet, were characterised for real-world dilution scenarios. The method used was based on using CO2 as a tracer of exhaust gas dilution. The particles were sampled by using an extractive sampling method and analysed with high time resolution instrumentation EEPS (10 Hz and CO2 with non-dispersive infrared gas analyser (LI-840, LI-COR Inc. 1 Hz. The gaseous constituents (CO, HC and NO were measured by using a remote sensing device (AccuScan RSD 3000, Environmental System Products Inc.. Nitrogen oxides, NOx, were estimated from NO by using default NO2/NOx ratios from the road vehicle emission model HBEFA 3.1. The buses studied were diesel-fuelled Euro II–V and CNG-fuelled Enhanced Environmental Friendly Vehicles (EEVs with different after-treatment, including selective catalytic reduction (SCR, exhaust gas recirculation (EGR and with and without diesel particulate filter (DPF. The primary driving mode applied in this study was accelerating mode. However, regarding the particle emissions also a constant speed mode was analysed. The investigated CNG buses emitted on average higher number of particles but less mass compared to the diesel-fuelled buses. Emission factors for number of particles (EFPN were EFPN, DPF = 8.0 ± 3.1 × 1014, EFPN, no DPF =2.8 ± 1.6 × 1015 and EFPN, CNG = 7.8 ± 5.7 × 1015 (kg fuel−1. In the accelerating mode size-resolved EFs showed unimodal number size distributions with peak diameters of 70–90 nm and 10 nm for diesel and CNG buses, respectively. For the constant speed mode bimodal average number size distributions were obtained for the diesel buses with peak modes of ~10 nm and ~60 nm.

    Emission

  9. The Aerodynamics of Heavy Vehicles III : Trucks, Buses and Trains

    CERN Document Server

    Orellano, Alexander

    2016-01-01

    This volume contains papers presented at the International conference “The Aerodynamics of Heavy Vehicles III: Trucks, Buses and Trains” held in Potsdam, Germany, September 12-17, 2010 by Engineering Conferences International (ECI). Leading scientists and engineers from industry, universities and research laboratories, including truck and high-speed train manufacturers and operators were brought together to discuss computer simulation and experimental techniques to be applied for the design of more efficient trucks, buses and high-speed trains in the future.   This conference was the third in the series after Monterey-Pacific Groove in 2002 and Lake Tahoe in 2007.  The presentations address different aspects of train aerodynamics (cross wind effects, underbody flow, tunnel aerodynamics and aeroacoustics, experimental techniques), truck aerodynamics (drag reduction, flow control, experimental and computational techniques) as well as computational fluid dynamics and bluff body, wake and jet flows.

  10. To Evaluate Zero Emission Propulsion and Support Technology for Transit Buses

    Energy Technology Data Exchange (ETDEWEB)

    Kevin Chandler; Leslie Eudy

    2006-11-01

    This report provides evaluation results for prototype fuel cell transit buses operating at Santa Clara Valley Transportation Authority (VTA) in San Jose, California, in partnership with the San Mateo County Transit District in San Carlos, California. VTA has been operating three fuel cell transit buses in extra revenue service since February 28, 2005. This report provides descriptions of the equipment used, early experiences, and evaluation results from the operation of the buses and the supporting hydrogen infrastructure from March 2005 through July 2006.

  11. Bay Area Transit Agencies Propel Fuel Cell Buses Toward Commercialization (Fact Sheet)

    Energy Technology Data Exchange (ETDEWEB)

    2010-07-01

    This fact sheet describes the Zero Emission Bay Area (ZEBA) demonstration of the next generation of fuel cells buses. Several transit agencies in the San Francisco Bay Area are participating in demonstrating the largest single fleet of fuel cell buses in the United States.

  12. 78 FR 719 - California State Motor Vehicle Pollution Control Standards; Urban Buses; Request for Waiver of...

    Science.gov (United States)

    2013-01-04

    ... AGENCY California State Motor Vehicle Pollution Control Standards; Urban Buses; Request for Waiver of... amendments to its emission standards for urban bus engines in a series of rulemakings. The rulemakings at... public transit agencies that operate urban buses and other transit vehicles; additionally,...

  13. 78 FR 44112 - California State Motor Vehicle Pollution Control Standards; Urban Buses; Request for Waiver of...

    Science.gov (United States)

    2013-07-23

    ... AGENCY California State Motor Vehicle Pollution Control Standards; Urban Buses; Request for Waiver of... for emission standards and related test procedures contained in its urban bus regulations as they affect the 2002 and later model years. Urban buses are conventionally powered by a heavy-duty...

  14. Using Task Clarification, Goal Setting, and Feedback to Decrease Table Busing Times in a Franchise Pizza Restaurant

    Science.gov (United States)

    Amigo, Seth; Smith, Andrew; Ludwig, Timothy

    2008-01-01

    The current study investigated the effects of task-clarification, and manager verbal and graphic feedback on employee busing times at a pizza restaurant. Using an ABC design, task-clarification was provided in a memo, which described the process, priority, and goal time of busing. The busing time decreased slightly, from an average of 315 seconds…

  15. The Busing Controversy. [NAESP] School Leadership Digest [Second Series, Number 6. ERIC/CEM Research Analysis Series, Number 21.

    Science.gov (United States)

    Schofield, Dee

    To understand the controversy over busing, it is necessary to understand the relationship between busing and the issues that are actually at the root of the controversy: desegregation and freedom of choice. Much of the political activity surrounding busing is a subtle transfer of attention away from the basic issue of desegregation. Other…

  16. Solar array deployment qualification for the LMX of buses

    Science.gov (United States)

    Lee, Kathy

    2005-07-01

    The solar array deployment system for the LMX line of buses deploys rigid Solar Array Wing Assemblies (SAWAs). Each SAWA has a set of Solar Array Deployment Mechanisms (SADM), which consists of two hinges, a strut, and two Hold Down Release Mechanisms (HDRMs). To qualify the SADM for flight, each mechanism component was qualified individually, then assembled to a qualification SAWA on Special Test Equipment (STE) and deployed in a thermal vacuum chamber at ambient, hot, and cold temperatures. These mechanisms were designed, built, and tested by the Power and Mechanisms part of the Power, Thermal, Structures & Mechanisms Product Center, which develops products for both internal and external customers. This paper will discuss the qualification effort for the LMX Solar Array deployment, including qualification hardware and STE. It will focus on unique challenges presented by each aspect of the qualification, and lessons learned from the hardware integration and the qualification testing.

  17. Txatarra: vivienda transitoria con buses de transporte público

    Directory of Open Access Journals (Sweden)

    Juan Pablo Arenas Vargas

    2011-07-01

    Full Text Available El presente análisis del proyecto Casa Linda parte de una exploración conceptual en torno a un hábitat sostenible, mediante la generación de un tipo de vivienda transitoria que reutiliza buses de transporte público destinados a ser reducidos a chatarra. La necesidad de replantear la labor de configurar espacios con materiales y formas predeterminados llevó a los autores a comprender cómo resultan insuficientes los medios tradicionales de construcción, en los que se acostumbra emplear materias primas en presentaciones estandarizadas y con acabados predefinidos que se adaptan a los requerimientos y necesidades del proyecto. Enfrentar el proyecto a partir del reciclaje de materiales y objetos (chatarra, de diversas dimensiones y en variadas condiciones, generó un proceso cuya característica principal es la imposibilidad de anticipar con exactitud los procesos constructivos y los acabados finales.

  18. Resistojet control and power for high frequency ac buses

    Science.gov (United States)

    Gruber, Robert P.

    1987-01-01

    Resistojets are operational on many geosynchronous communication satellites which all use dc power buses. Multipropellant resistojets were selected for the Initial Operating Capability (IOC) Space Station which will supply 208 V, 20 kHz power. This paper discusses resistojet heater temperature controllers and passive power regulation methods for ac power systems. A simple passive power regulation method suitable for use with regulated sinusoidal or square wave power was designed and tested using the Space Station multipropellant resistojet. The breadboard delivered 20 kHz power to the resistojet heater. Cold start surge current limiting, a power efficiency of 95 percent, and power regulation of better than 2 percent were demonstrated with a two component, 500 W breadboard power controller having a mass of 0.6 kg.

  19. Fuel Cell Buses in U.S. Transit Fleets: Current Status 2009

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, L.; Chandler, K.; Gikakis, C.

    2009-10-01

    This report documents progress in meeting the technological challenges of fuel cell propulsion for transportation based on current fuel cell transit bus demonstrations and plans for more fuel cell transit buses and hydrogen infrastructure.

  20. Interim Evaluation Results from New Flyer/Allison Hybrid Buses at King County Metro: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Chandler, K.; Eberts, E.; Eudy, L.

    2005-05-01

    This paper prepared for the 2005 American Public Transportation Association Bus & Paratransit Conference discusses NREL/DOE evaluation of hybrid electric articulated transit buses operated by King County Metro.

  1. Cool Science: K-12 Climate Change Art Displayed on Buses

    Science.gov (United States)

    Chen, R. F.; Lustick, D. S.; Lohmeier, J.; Thompson, S. R.

    2015-12-01

    Cool science is an art contest where K12 students create placards (7" x 22") to educate the public about climate change. Students are prompted to create their artwork in response to questions such as: What is the evidence for climate change? How does climate change impact your local community? What can you do to reduce the impacts of climate change? In each of three years, 500-600 student entrees have been submitted from more than 12 school districts across Massachusetts. A panel of judges including scientists, artists, rapid transit representatives, and educators chooses elementary, middle, and high school winners. Winners (6), runners-up (6), and honorable mentions (12) and their families and teachers are invited to an annual Cool Science Award Ceremony to be recognized and view winning artwork. All winning artwork is posted on the Cool Science website. The winning artwork (2 per grade band) is converted into placards (11" x 28") and posters (2.5' x 12') that are placed on the inside (placards) and outside (posters) of buses. Posters are displayed for one month. So far, Cool Science was implemented in Lowell, MA where over 5000 public viewers see the posters daily on the sides of Lowell Rapid Transit Authority (LRTA) buses, making approximately 1,000,000 impressions per year. Cool Science acts to increase climate literacy in children as well as the public, and as such promotes intergenerational learning. Using art in conjunction with science learning about climate change appears to be effective at engaging not just traditionally high achieving science students, but also those interested in the creative arts. Hearing winners' stories about how they created their artwork and what this contest meant to them supports the idea that Cool Science attracts a wide diversity of students. Parents discuss climate change with their children. Multiple press releases announcing the winners further promotes the awareness of climate change throughout school districts and their

  2. CNG buses fire safety : learnings from recent accidents in France and Germany

    OpenAIRE

    Perrette, Lionel; Wiedemann, Helmut K.

    2007-01-01

    International audience; The use of CNG in bus and private vehicles is growing steadily. Recent fire accidents involving CNG buses have shown that tanks may explode though compliant with current ECE UN R110 regulation. Such a repeated scenario is certainly not acceptable having in mind the tremendous amount of energy released when a compressed tank bursts. Investigation of German and French recent cases detailed in this article highlights potential improvements in current CNG buses fire safety...

  3. In-use fuel economy of hybrid-electric school buses in Iowa.

    Science.gov (United States)

    Hallmark, Shauna; Sperry, Bob; Mudgal, Abhisek

    2011-05-01

    Although it is much safer and more fuel-efficient to transport children to school in buses than in private vehicles, school buses in the United States still consume 822 million gal of diesel fuel annually, and school transportation costs can account for a significant portion of resource-constrained school district budgets. Additionally, children in diesel-powered school buses may be exposed to higher levels of particulates and other pollutants than children in cars. One solution to emission and fuel concerns is use of hybrid-electric school buses, which have the potential to reduce emissions and overall lifecycle costs compared with conventional diesel buses. Hybrid-electric technologies are available in the passenger vehicle market as well as the transit bus market and have a track record indicating fuel economy and emissions benefits. This paper summarizes the results of an in-use fuel economy evaluation for two plug-in hybrid school buses deployed in two different school districts in Iowa. Each school district selected a control bus with a route similar to that of the hybrid bus. Odometer readings, fuel consumption, and maintenance needs were recorded for each bus. The buses were deployed in 2008 and data were collected through May 2010. Fuel consumption was calculated for each school district. In Nevada, IA, the overall average fuel economy was 8.23 mpg for the hybrid and 6.35 mpg for the control bus. In Sigourney, IA, the overall average fuel economy was 8.94 mpg for the hybrid and 6.42 mpg for the control bus. The fuel consumption data were compared for the hybrid and control buses using a Wilcoxon signed rank test. Results indicate that fuel economy for the Nevada hybrid bus was 29.6% better than for the Nevada control bus, and fuel economy for the Sigourney hybrid bus was 39.2% higher than for the Sigourney control bus. Both differences were statistically significant.

  4. Intermediate transport in Southeast Asia. [Carts, cycles, mini-buses

    Energy Technology Data Exchange (ETDEWEB)

    Meier, A.K.

    1977-06-01

    Traffic flows through the streets of Southeast Asian countries even though they are used for almost all aspects of human and animal existence. The carts, bicycles, tricycles, and motorcycles, motorized three-wheelers, mini-buses are the so-called intermediate-transport vehicles. It is upon this group of vehicles that a culture--constrained by its own unique economic, environmental, and technological factors--exerts its influence most directly toward the solution of the transport problem. Transportation fills more service roles in Southeast Asian cities than in Western cities. Communication facilities such as telephones and postal services are notoriously unreliable. The personal encounter is all important in social and business interactions in Southeast Asia. Each of the transport modes is examined in view of design and use in a number of specific cultural settings for the countries in Southeast Asia. Present use of intermediate transport in developed countries is discussed briefly, and its further development predicted--pointing out the health and conservation advantages. (MCW)

  5. Evaluation of Alternative Field Buses for Lighting ControlApplications

    Energy Technology Data Exchange (ETDEWEB)

    Koch, Ed; Rubinstein, Francis

    2005-03-21

    The Subcontract Statement of Work consists of two major tasks. This report is the Final Report in fulfillment of the contract deliverable for Task 1. The purpose of Task 1 was to evaluate existing and emerging protocols and standards for interfacing sensors and controllers for communicating with integrated lighting control systems in commercial buildings. The detailed task description follows: Task 1. Evaluate alternative sensor/field buses. The objective of this task is to evaluate existing and emerging standards for interfacing sensors and controllers for communicating with integrated lighting control systems in commercial buildings. The protocols to be evaluated will include at least: (1) 1-Wire Net, (2) DALI, (3) MODBUS (or appropriate substitute such as EIB) and (4) ZigBee. The evaluation will include a comparative matrix for comparing the technical performance features of the different alternative systems. The performance features to be considered include: (1) directionality and network speed, (2) error control, (3) latency times, (4) allowable cable voltage drop, (5) topology, and (6) polarization. Specifically, Subcontractor will: (1) Analyze the proposed network architecture and identify potential problems that may require further research and specification. (2) Help identify and specify additional software and hardware components that may be required for the communications network to operate properly. (3) Identify areas of the architecture that can benefit from existing standards and technology and enumerate those standards and technologies. (4) Identify existing companies that may have relevant technology that can be applied to this research. (5) Help determine if new standards or technologies need to be developed.

  6. Self-service fare collection on buses in Portland, Oregon. Final report, Septtember 1980-April 1984

    Energy Technology Data Exchange (ETDEWEB)

    Wagner, D.; Harper, W.; Schueftan, O.

    1986-09-01

    In 1980, the Urban Mass Transportation Administration (UMTA) awarded grants to the Tri-County Metropolitan Transportation District (TRI-MET) to implement self-service fare collection (SSFC) on its bus system. TRI-MET, the transit authority serving Portland, Oregon, is the second authority in the United States to use SSFC and the first to use it on buses. TRI-MET expected SSFC to improve bus productivity, facilitate distance-based fares, and reduce fare evasion. Problems encountered with SSFC on buses in Portland included increased fare evasion, high enforcement costs, no productivity improvements, low surcharge/ fine collections, overburdened courts, and increased vandalism. These problems need to be overcome before SSFC can be successful on buses in other U.S. cities.

  7. Fuel Cell Buses in U.S. Transit Fleets: Current Status 2011

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, L.; Chandler, K.; Gikakis, C.

    2011-11-01

    This status report, fifth in a series of annual status reports from the U.S. Department of Energy's National Renewable Energy Laboratory (NREL), discusses the achievements and challenges of fuel cell propulsion for transit and summarizes the introduction of fuel cell transit buses in the United States. Progress this year includes an increase in the number of fuel cell electric buses (FCEBs), from 15 to 25, operating at eight transit agencies, as well as increased diversity of the fuel cell design options for transit buses. The report also provides an analysis of the combined results from fuel cell transit bus demonstrations evaluated by NREL with a focus on the most recent data through July 2011 including fuel cell power system reliability and durability; fuel economy; roadcall; and hydrogen fueling results. These evaluations cover 22 of the 25 FCEBs currently operating.

  8. Fuel Cell Buses in U.S. Transit Fleets: Current Status 2010

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, L.; Chandler, K.; Gigakis, C.

    2010-11-01

    This status report, fourth in a series of annual status reports from the U.S. Department of Energy's National Renewable Energy Laboratory, summarizes progress and accomplishments from demonstrations of fuel cell transit buses in the United States. This year's assessment report provides the results from the fifth year of operation of five Van Hool, ISE, and UTC Power fuel cell buses operating at AC Transit, SunLine, and CTTRANSIT. The achievements and challenges of this bus design, implementation, and operating are presented, with a focus on the next steps for implementing larger numbers and new and different designs of fuel cell buses. The major positive result from nearly five years of operation is the dramatic increase in reliability experienced for the fuel cell power system.

  9. Effectivness Of The Failure Rate On Maintenance Costs Of The City Buses

    Directory of Open Access Journals (Sweden)

    Ignaciuk Piotr

    2015-11-01

    Full Text Available The purpose of this paper was to present a failure rate and maintenance cost comparison for two types of city transport buses. The paper presents in detail a case study of well known bus brands used at Municipal Transport Company in Lublin. A failure index of all functional and constructional systems of the vehicles and their technical availability with regards to calendar time was determined. The paper also presents analysis of the factors related to maintenance costs of buses, including costs of fluids, repair costs and maintenance service. It has been demonstrated, that both analyzed buses generate similar maintenance costs, while their failures and technical availability differ significantly in operational practice. These differences are particularly evident in relation to the cumulative costs of repairs.

  10. COMPARATIVE STUDY ON EXHAUST EMISSIONS FROM DIESEL- AND CNG-POWERED URBAN BUSES

    Energy Technology Data Exchange (ETDEWEB)

    COROLLER, P; PLASSAT, G

    2003-08-24

    Couple years ago, ADEME engaged programs dedicated to the urban buses exhaust emissions studies. The measures associated with the reduction of atmospheric and noise pollution has particular importance in the sector of urban buses. In many cases, they illustrate the city's environmental image and contribute to reinforcing the attractiveness of public transport. France's fleet in service, presently put at about 14,000 units, consumes about 2 per cent of the total energy of city transport. It causes about 2 per cent of the HC emissions and from 4 to 6 per cent of the NOx emissions and particles. These vehicles typically have a long life span (about 15 years) and are relatively expensive to buy, about 150.000 euros per unit. Several technical solutions were evaluated to quantify, on a real condition cycle for buses, on one hand pollutants emissions, fuel consumption and on the other hand reliability, cost in real existing fleet. This paper presents main preliminary results on urban buses exhaust emission on two different cases: - existing Diesel buses, with fuel modifications (Diesel with low sulphur content), Diesel with water emulsion and bio-Diesel (30% oil ester in standard Diesel fuel); renovating CNG powered Euro II buses fleet, over representative driving cycles, set up by ADEME and partners. On these cycles, pollutants (regulated and unregulated) were measured as well as fuel consumption, at the beginning of a program and one year after to quantify reliability and increase/decrease of pollutants emissions. At the same time, some after-treatment technologies were tested under real conditions and several vehicles. Information such as fuel consumption, lubricant analysis, problem on the technology were following during a one year program. On the overall level, it is the combination of various action, pollution-reduction and renewal that will make it possible to meet the technological challenge of reducing emissions and fuel consumption by urban bus

  11. Particle and gaseous emissions from compressed natural gas and ultralow sulphur diesel-fuelled buses at four steady engine loads.

    Science.gov (United States)

    Jayaratne, E R; Ristovski, Z D; Meyer, N; Morawska, L

    2009-04-01

    Exhaust emissions from thirteen compressed natural gas (CNG) and nine ultralow sulphur diesel in-service transport buses were monitored on a chassis dynamometer. Measurements were carried out at idle and at three steady engine loads of 25%, 50% and 100% of maximum power at a fixed speed of 60 km h(-1). Emission factors were estimated for particle mass and number, carbon dioxide and oxides of nitrogen for two types of CNG buses (Scania and MAN, compatible with Euro 2 and 3 emission standards, respectively) and two types of diesel buses (Volvo Pre-Euro/Euro1 and Mercedez OC500 Euro3). All emission factors increased with load. The median particle mass emission factor for the CNG buses was less than 1% of that from the diesel buses at all loads. However, the particle number emission factors did not show a statistically significant difference between buses operating on the two types of fuel. In this paper, for the very first time, particle number emission factors are presented at four steady state engine loads for CNG buses. Median values ranged from the order of 10(12) particles min(-)(1) at idle to 10(15) particles km(-)(1) at full power. Most of the particles observed in the CNG emissions were in the nanoparticle size range and likely to be composed of volatile organic compounds The CO2 emission factors were about 20% to 30% greater for the diesel buses over the CNG buses, while the oxides of nitrogen emission factors did not show any difference due to the large variation between buses.

  12. Transportation of Wheelchair Seated Students in School Buses: A Review of State Policy

    Science.gov (United States)

    Moore, Britta; Fuhrman, Susan; Karg, Patricia

    2010-01-01

    This study quantitatively reviews publicly available state policies as they relate to the transportation of wheelchair-seated students in school buses. Inclusion of best practices in specially equipped school bus and driver training policies was assessed. Key points of interest within state policies were identified based on site visits, common…

  13. Comparative study of fuel cell, battery and hybrid buses for renewable energy constrained areas

    Science.gov (United States)

    Stempien, J. P.; Chan, S. H.

    2017-02-01

    Fuel cell- and battery-based public bus technologies are reviewed and compared for application in tropical urban areas. This paper scrutinizes the reported literature on fuel cell bus, fuel cell electric bus, battery electric bus, hybrid electric bus, internal combustion diesel bus and compressed natural gas bus. The comparison includes the capital and operating costs, fuel consumption and fuel cycle emissions. To the best of authors knowledge, this is the first study to holistically compare hydrogen and battery powered buses, which is the original contribution of this paper. Moreover, this is the first study to focus on supplying hydrogen and electricity from fossil resources, while including the associated emissions. The study shows that compressed natural gas and hybrid electric buses appear to be the cheapest options in terms of total cost of ownership, but they are unable to meet the EURO VI emissions' standard requirement. Only fuel cell based buses have the potential to achieve the emissions' standard when the fuel cycle based on fossil energy was considered. Fuel cell electric buses are identified as a technology allowing for the largest CO2 emission reduction, making ∼61% decrease in annual emissions possible.

  14. 40 CFR 52.263 - Priority treatment for buses and carpools-Los Angeles Region.

    Science.gov (United States)

    2010-07-01

    ... § 52.263 Priority treatment for buses and carpools—Los Angeles Region. (a) Definitions: (1) “Carpool” means a vehicle containing three or more persons. (2) “Bus/carpool lane” means a lane on a street or... agencies to which legal authority has been delegated, shall establish the following system of...

  15. 76 FR 77888 - Student Transportation of America, Inc.-Control-Dairyland Buses, Inc.

    Science.gov (United States)

    2011-12-14

    ... Surface Transportation Board Student Transportation of America, Inc.--Control--Dairyland Buses, Inc... Transaction. SUMMARY: Student Transportation of America, Inc., a motor carrier of passengers (Student... 1182.8. DATES: Comments must be filed by January 27, 2012. Student Transportation may file a reply...

  16. Leadership Thrust of Urban School Educators for Meeting the Challenge of Busing.

    Science.gov (United States)

    Sommerville, Joseph C.

    Based on a nationwide survey of urban school administrators, personal experiences of the author, and a review of relevant desegregation literature, this paper explores the role of administrators in the achievement of the objectives of busing for school desegregation. Findings cited from the survey include: (1) peak periods of conflict occur in the…

  17. An introduction on the demonstration performance of fuel cell buses (FCB) in Beijing

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Since the 1990’s, hydrogen has found broad use in the traffic segment. Compared with conventional ones, hydrogen fuelled vehicles, a new generation of clean vehicles, produce no pollutants, with higher energy efficiency. In today’s world where the pollution is tougher, the "Zero Pollution" fuel cell buses display a

  18. Seat Belts in School Buses: A Technical Analysis of the Literature.

    Science.gov (United States)

    Splaine, Pam; Frankel, Steven M.

    This report, prepared for the Montgomery County (Maryland) Public Schools superintendent and board members, identifies the questions concerning seat belt use in school buses, examines relevant literature, and draws some conclusions. According to the literature, seat belts are one of many alternative and interdependent safety devices built into…

  19. 76 FR 53102 - Federal Motor Vehicle Safety Standards; Denial of Petition for Rulemaking; School Buses

    Science.gov (United States)

    2011-08-25

    ... belt use, the effects on bus discipline, the attitudes of other stakeholders, the loss of capacity... the past 34 years that compartmentalization and the school bus safety standards have been in effect... requiring seat belts on large school buses would protect passengers against an unreasonable risk of death...

  20. 26 CFR 41.4483-2 - Exemption for certain transit-type buses.

    Science.gov (United States)

    2010-04-01

    ... the same facts as those stated in Example (1), except that the X Transit Company commences operation... the same facts as those stated in Example (1), except that the X Transit Company commences operation... 26 Internal Revenue 16 2010-04-01 2010-04-01 true Exemption for certain transit-type buses....

  1. Efficiency evaluation of gas fuelled and electric driven buses in the public transport sector

    Energy Technology Data Exchange (ETDEWEB)

    Aigner, Tobias Alexander

    2013-07-01

    The following report evaluates the efficiency of gas fuelled and electric driven buses in the public transport sector on a theoretical basis. The results indicate that the combination of CHP power plants and electric driven buses reach an overall efficiency of about 51% throughout the production chain (Well-to-Wheel), including heat distribution losses. The overall Well-to-Wheel efficiency for conventional gas turbines without heat recovery decreases to around 28%. For gas fuelled buses the Well-to-Wheel efficiency is about 30%. The Co2-emissions are evaluated based on the example of a #Left Double Quotation Mark#Volvo B10L CNG#Right Double Quotation Mark# gas bus and the electric driven #Left Double Quotation Mark#Eurabus 600#Right Double Quotation Mark#. The low energy consumption of the electric driven bus results in Co2-emissions of only 181.4 g Co2/km (Grid-to-Wheel). Depending on the utilised power plant technology the overall Co2-emissions (Well-to-Wheel) amount to 307.5 g Co2/km for a CHP power plant and 553.5 g Co2/km for a conventional gas turbine. On the other hand, gas fuelled buses emit about 1.25 kg Co2/km (Tank-to-Wheel), which is eightfold the emissions of an electrical bus. The Well-to-Tank emissions further increase to about 1.32 kg Co2/km. The emission calculation is based on real gas consumption data from a Norwegian public transport utility. The results indicate that the combination of CHP plants and electrical buses provide a much higher efficiency while reducing Co2-emissions. (author)

  2. [Energy Conservation and Emissions Reduction Benefits Analysis for Battery Electric Buses Based on Travel Services].

    Science.gov (United States)

    Lin, Xiao-dan; Tian, Liang; Lü, Bin; Yang, Jian-xin

    2015-09-01

    Battery Electric Bus (BEB) has become one of prior options of urban buses for its "zero emission" during the driving stage. However, the environmental performance of electric buses is affected by multi-factors from the point of whole life cycle. In practice, carrying capacity of BEB and power generation structures can both implement evident effects on the energy consumption and pollutants emission of BEB. Therefore, take the above factors into consideration, in this article, Life Cycle Assessment is employed to evaluate the energy conservation and emissions reduction benefits of BEB. Results indicate that, travel service is more reasonable as the functional unit, rather than mileage, since the carrying capacity of BEB is 15% lower than the diesel buses. Moreover, compared with diesel buses, the energy conservation and emissions reduction benefits of battery electric buses are all different due to different regional power structures. Specifically, the energy benefits are 7. 84%, 11. 91%, 26. 90%, 11. 15%, 19. 55% and 20. 31% respectively in Huabei, Huadong, Huazhong, Dongbei, Xibei and Nanfang power structure. From the point of comprehensive emissions reduction benefits, there is no benefit in Huabei power structure, as it depends heavily on coal. But in other areas, the comprehensive emissions reduction benefits of BEB are separately 3. 46%, 26. 81%, 1. 17%, 13. 74% and 17. 48% in Huadong, Huazhong, Dongbei, Xibei and Nanfang. Therefore, it suggests that, enlargement of carrying capacity should be taken as the most prior technology innovation direction for BEB, and the grids power structure should be taken into consideration when the development of BEB is in planning.

  3. Gaseous emissions from compressed natural gas buses in urban road and highway tests in China.

    Science.gov (United States)

    Yue, Tingting; Chai, Fahe; Hu, Jingnan; Jia, Ming; Bao, Xiaofeng; Li, Zhenhua; He, Liqang; Zu, Lei

    2016-10-01

    The natural gas vehicle market is rapidly developing throughout the world, and the majority of such vehicles operate on compressed natural gas (CNG). However, most studies on the emission characteristics of CNG vehicles rely on laboratory chassis dynamometer measurements, which do not accurately represent actual road driving conditions. To further investigate the emission characteristics of CNG vehicles, two CNG city buses and two CNG coaches were tested on public urban roads and highway sections. Our results show that when speeds of 0-10km/hr were increased to 10-20km/hr, the CO2, CO, nitrogen oxide (NOx), and total hydrocarbon (THC) emission factors decreased by (71.6±4.3)%, (65.6±9.5)%, (64.9±9.2)% and (67.8±0.3)%, respectively. In this study, The Beijing city buses with stricter emission standards (Euro IV) did not have lower emission factors than the Chongqing coaches with Euro II emission standards. Both the higher emission factors at 0-10km/hr speeds and the higher percentage of driving in the low-speed regime during the entire road cycle may have contributed to the higher CO2 and CO emission factors of these city buses. Additionally, compared with the emission factors produced in the urban road tests, the CO emission factors of the CNG buses in highway tests decreased the most (by 83.2%), followed by the THC emission factors, which decreased by 67.1%.

  4. Chemical and toxicological properties of emissions from CNG transit buses equipped with three-way catalysts compared to lean-burn engines and oxidation catalyst technologies

    Science.gov (United States)

    Yoon, Seungju; Hu, Shaohua; Kado, Norman Y.; Thiruvengadam, Arvind; Collins, John F.; Gautam, Mridul; Herner, Jorn D.; Ayala, Alberto

    2014-02-01

    Chemical and toxicological properties of emissions from compressed natural gas (CNG) fueled transit buses with stoichiometric combustion engines and three-way catalyst (TWC) exhaust control systems were measured using a chassis dynamometer testing facility and compared to the data from earlier CNG engine and exhaust control technologies. Gaseous and particulate matter emissions from buses with stoichiometric engines and TWC were significantly lower than the emissions from buses with lean-burn engines. Carbonyls and volatile organic compounds (VOCs) from buses with stoichiometric engines and TWC were lower by more than 99% compared to buses with lean-burn engines. Elemental and organic carbons (EC and OC), polycyclic aromatic hydrocarbons (PAHs), and trace elements from buses with stoichiometric engines and TWC were effectively controlled and significantly lower than the emissions from buses with lean-burn engines. Potential mutagenicity measured using a microsuspension modification of the Salmonella/microsome assay was lower by more than 99% for buses with stoichiometric engines and TWC, compared to buses with lean-burn engines and OxC.

  5. The Fuel Economy of Hybrid Buses: The Role of Ancillaries in Real Urban Driving

    Directory of Open Access Journals (Sweden)

    Francesco Bottiglione

    2014-07-01

    Full Text Available In the present context of the global economic crisis and environmental emergency, transport science is asked to find innovative solutions to turn traditional vehicles into fuel-saving and eco-friendly devices. In the last few years, hybrid vehicles have been shown to have potential benefits in this sense. In this paper, the fuel economy of series hybrid-electric and hybrid-mechanical buses is simulated in two real driving situations: cold and hot weather driving in the city of Taranto, in Southern Italy. The numerical analysis is carried out by an inverse dynamic approach, where the bus speed is given as a velocity pattern measured in the field tests performed on one of the city bus routes. The city of Taranto drive schedule is simulated in a typical tempered climate condition and with a hot temperature, when the air conditioning system must be switched on for passenger comfort. The fuel consumptions of hybrid-electric and hybrid-mechanical buses are compared to each other and with a traditional bus powered by a diesel engine. It is shown that the series hybrid-electric vehicle outperforms both the traditional and the mechanical hybrid vehicles in the cold weather driving simulation, reducing the fuel consumption by about 35% with respect to the traditional diesel bus. However, it is also shown that the performance of the hybrid-electric bus gets dramatically worse when the air-cooling system is continuously turned on. In this situation, the fuel consumption of the three different technologies for city buses under investigation is comparable.

  6. Analysis of the cost of hydrogen infrastructure for buses in London

    Science.gov (United States)

    Shayegan, S.; Hart, D.; Pearson, P.; Joffe, D.

    The use of hydrogen (H 2) as transport fuel is often said to suffer from the 'chicken and egg' problem: vehicles that depend on H 2 cannot go on the roads due to the lack of an adequate infrastructure, and the almost non-existent fleet of H 2 vehicles on the roads makes it economically unsound to build a H 2 infrastructure. Although both hydrogen vehicles (fuel cell and internal combustion engine) and the related infrastructure have been (and are being) developed and some are commercially available, cost is seen as a major barrier. With today's technologies, H 2 only becomes competitive with petrol and diesel when produced at large quantities, suitable for supplying e.g. thousands of H 2 buses. The question is, how might this point be reached, and are there least cost infrastructural pathways to reach it. This paper tries to address the latter question, using the early development of a H 2 infrastructure for buses in London as a case study. The paper presents some of the analyses and results from a Ph.D. project (in progress) being undertaken at Imperial College London, funded by EPSRC (Grant GR/R50790/01). The results presented here illustrate that cost of hydrogen production and delivery vary mainly with levels of hydrogen demand and delivery distances, as well as other logistic criteria; least cost production-delivery pathways have been identified for various hydrogen demand scenarios and refuelling station set-ups. Another important conclusion is that the pattern of converting a group of refuelling stations to hydrogen (e.g. a group of refuelling stations for buses in London) has a significant effect on the unit cost of hydrogen.

  7. Characteristics of cabin air quality in school buses in Central Texas

    Science.gov (United States)

    Rim, Donghyun; Siegel, Jeffrey; Spinhirne, Jarett; Webb, Alba; McDonald-Buller, Elena

    This study assessed in-cabin concentrations of diesel-associated air pollutants in six school buses with diesel engines during a typical route in suburban Austin, Texas. Air exchange rates measured by SF 6 decay were 2.60-4.55 h -1. In-cabin concentrations of all pollutants measured exhibited substantial variability across the range of tests even between buses of similar age, mileage, and engine type. In-cabin NO x concentrations ranged from 44.7 to 148 ppb and were 1.3-10 times higher than roadway NO x concentrations. Mean in-cabin PM 2.5 concentrations were 7-20 μg m -3 and were generally lower than roadway levels. In-cabin concentrations exhibited higher variability during cruising mode than frequent stops. Mean in-cabin ultrafine PM number concentrations were 6100-32,000 particles cm -3 and were generally lower than roadway levels. Comparison of median concentrations indicated that in-cabin ultrafine PM number concentrations were higher than or approximately the same as the roadway concentrations, which implied that, by excluding the bias caused by local traffic, ultrafine PM levels were higher in the bus cabin than outside of the bus. Cabin pollutant concentrations on three buses were measured prior to and following the phased installation of a Donaldson Spiracle Crankcase Filtration System and a Diesel Oxidation Catalyst. Following installation of the Spiracle, the Diesel Oxidation Catalyst provided negligible or small additional reductions of in-cabin pollutant levels. In-cabin concentration decreases with the Spiracle alone ranged from 24 to 37% for NO x and 26 to 62% and 6.6 to 43% for PM 2.5 and ultrafine PM, respectively. Comparison of the ranges of PM 2.5 and ultrafine PM variations between repetitive tests suggested that retrofit installation could not always be conclusively linked to the decrease of pollutant levels in the bus cabin.

  8. Operational integrity using field buses; Integridade operacional utilizando barramentos de campo

    Energy Technology Data Exchange (ETDEWEB)

    Hennig, Carlos Henrique [Coester Automacao S.A., Sao Leopoldo, RS (Brazil)

    2004-07-01

    The device information is collected using standardized Filed Buses with high data transmission capacity, which allows the analysis of his operational status in real time. The quantity of information generated by the devices for the maintenance area is increasing and this data quantity transferred through the field bus should not interfere in the network performance to the point of degrade his control function. In this way, is presented a technique that can be used in different protocols, which allow sending of maintenance data using a small band of the communication channel. Operational integrity can be achieved using predictive maintenance techniques based on the collected data. (author)

  9. In-Use Fleet Evaluation of Fast-Charge Battery Electric Transit Buses

    Energy Technology Data Exchange (ETDEWEB)

    Prohaska, Robert; Kelly, Kenneth; Eudy; Leslie

    2016-06-27

    With support from the U.S. Department of Energy's Vehicle Technologies Office, the National Renewable Energy Laboratory (NREL) conducts real-world performance evaluations of advanced medium- and heavy-duty fleet vehicles. Evaluation results can help vehicle manufacturers fine-tune their designs and assist fleet managers in selecting fuel-efficient, low-emission vehicles that meet their economic and operational goals. In 2015, NREL launched an in-service evaluation of 12 battery electric buses (BEBs) compared to conventional compressed natural gas (CNG) buses operated by Foothill Transit in West Covina, California. The study aims to improve understanding of the overall usage and effectiveness of fast-charge BEBs and associated charging infrastructure in transit operation. To date, NREL researchers have analyzed more than 148,000 km of in-use operational data, including driving and charging events. Foothill Transit purchased the BEBs with grant funding from the Federal Transit Administration's Transit Investments for Greenhouse Gas and Energy Reduction Program.

  10. Fuel Cell Buses in U.S. Transit Fleets: Current Status 2015

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, Leslie [National Renewable Energy Lab. (NREL), Golden, CO (United States); Post, Matthew [National Renewable Energy Lab. (NREL), Golden, CO (United States); Gikakis, Christina [Federal Transit Administration, Washington, DC (United States)

    2015-12-11

    This report, published annually, summarizes the progress of fuel cell electric bus (FCEB) development in the United States and discusses the achievements and challenges of introducing fuel cell propulsion in transit. Various stakeholders, including FCEB developers, transit agencies, and system integrators, have expressed the value of this annual status report, which provides a summary of results from evaluations performed by the National Renewable Energy Laboratory. The annual status report tracks the progress of the FCEB industry toward meeting technical targets, documents the lessons learned, and discusses the path forward for commercial viability of fuel cell technology for transit buses. The 2015 summary results primarily focus on the most recent year for each demonstration, from August 2014 through July 2015. The results for these buses account for more than 1,045,000 miles traveled and 83,000 hours of fuel cell power system operation. The primary results presented in the report are from two demonstrations of fuel-cell-dominant bus designs: the Zero Emission Bay Area Demonstration Group led by Alameda-Contra Costa Transit District (AC Transit) in California and the American Fuel Cell Bus Project at SunLine Transit Agency in California.

  11. Hydrogen propulsion systems for transit buses - results of operation in passenger transport

    Energy Technology Data Exchange (ETDEWEB)

    Hipp, E.; Gruber, C. [MAN Nutzfahrzeuge AG, Advance Development (Germany)

    2000-07-01

    Hydrogen is a source of energy which can in the long term play a major role in the energy and transport industries. It can be generated without using fossil products and against the background of ever shorter oil reserves it reduces the supply risks for transport and industry. Further advantages of hydrogen as a fuel for motor vehicles are its potential for reduction of greenhouse gases and pollutants from traffic. The hydrogen project at Munich airport aims to demonstrate the technical feasibility of autonomous hydrogen generation combined with operation of vehicles. MAN is participating in this project with two low-floor articulated buses with hydrogen engines. A further vehicles from Neoplan has also been fitted with MAN H{sub 2} driveline technology. The vehicles will be used for carrying passengers on the airport apron from early 1999 to the end of 2000 and are expected to supply important information on the use of hydrogen in day-to-day transport. (orig.)

  12. Exposure to volatile organic compounds (VOC) in public buses of Pamplona, Northern Spain.

    Science.gov (United States)

    Parra, M A; Elustondo, D; Bermejo, R; Santamaría, J M

    2008-10-01

    This study examines the exposure level of passengers and drivers to VOC in public buses in a medium-size metropolitan area (Northern Spain). In-vehicle monitoring was performed on different routes, on peak and non-peak hours, during January and February 2007. A total of 112 air samples were collected onto adsorbent tubes and analysed by thermal desorption (TD) and gas chromatography/mass selective detector (GC/MSD) technique. Statistical differences were found among route to route concentrations, with those routes with major prevalence in the commercial area of the city displaying higher values; differences between peak and non-peak hours were also observed. A decrease in VOC concentrations was also registered during the weekend. BTEX ratios were estimated and found to be related to traffic emissions and similar for all the surveyed routes. Correlations confirmed traffic as the main emission source for BTEX and trimethylbenzene, their concentrations being highly associated to changes in meteorological conditions.

  13. Urban transportation system optimum: The effect of accounting for the interaction of buses and cars

    Directory of Open Access Journals (Sweden)

    Cristian Angelo Guevara

    2011-01-01

    Full Text Available En este trabajo se usa un método iterativo para calcular tarifas Pigouvianascuando las vías son compartidas por autos y buses. Se comparan escenarios en los cuales: 1 la tarifa es calculada considerando sólo la externalidad sobre otros vehículos; 2 la tarifa considera además la externalidad sobre los pasajeros de los vehículos; 3 no se aplican tarifas; y 4 no se aplican tarifas, pero algunas pistas son reservadas para el uso exclusivo de buses. El método es aplicado primero a un modelo idealizado que considera homogenidad de la demanda y cierto grado de heterogenidad en la oferta. Luego el método es aplicado en un experimento con datos reales basado en un modelo simultáneo de cuatro etapas calibrado para la ciudad de Santiago, Chile. Todos los experimentos muestran que cuando se considera la externalidad sobre los pasajeros de los vehículos, las tarifas Pigouvianas crecen sustancialmente en las vías de uso mixto, lo cual se traduce en un menor flujo de automóviles en dichas vías. Por otro lado, las simulaciones con el modelo idealizado muestran que el efecto de la reservación de pistas depende fuertemente del diseño considerado. Respecto de la tarificación Pigouviana, el experimento con datos reales muestra, sorprendentemente, que dicha política resultaría ser inferior a un escenario en el cual no se aplican tarifas. Este resultado podría atribuirse a: 1 que el modelo con datos reales representa una situación de equilibrio general y en cambio las tarifas Pigouvianas se calculan usando un enfoque de equilibrio parcial; 2 limitaciones de modelación en el experimento con datos reales; o 3 una manifestación del contraejemplo de Coase para los impuestos Pigouvianos. El artículo termina discutiendo el impacto de estos resultados en el análisis de políticas de transporte urbano.

  14. Mechanised charging stations enable point-to-point service for battery operated buses; Mechanisierte Ladestationen eroeffnen Batteriebussen den Linienbetrieb

    Energy Technology Data Exchange (ETDEWEB)

    Eggers, S. [Gottlob Auwaerter GmbH und Co., Stuttgart (Germany)

    1994-12-31

    Buses operated by an electrical battery do not any longer have a major disadvantage: the relatively short period of use/application. By means of mobile exchange charging stations the batteries of the buses do not have to be recharged for hours at installed charging stations or to be exchanged on a rather complicated way by forklifts. The battery exchange is as easy as filling up a car tank with diesel and can be carried out by the bus-driver himself within a few minutes. (orig.) [Deutsch] Batterie-elektrisch betriebene Busse haben einen gefuerchteten Nachteil verloren: die relativ geringe Einsatzzeit. Durch die mobile Wechsel-/Ladestation muessen die Busse nunmehr nicht mehr stundenlang an fest installierten Ladestationen `nachtanken` oder dort umstaendliche Batteriewechsel mit Hilfe von Gabelstaplern in Kauf nehmen. Der Batteriewechsel ist so einfach wie das Tanken von Dieselkraftstoff und wird von dem Busfahrer sebst in wenigen Minuten vorgenommen. (orig.)

  15. SIMPLIFIED METHOD FOR CALCULATING CLOSING IN OF SWITCH-GEAR FLEXIBLE BUSES AT SHORT CIRCUIT BY IMPULSE OF ELECTRODYNAMIC FORCES

    Directory of Open Access Journals (Sweden)

    I. I. Sergey

    2005-01-01

    Full Text Available The paper contains description of a simplified method for calculating closing-in of switch-gear flexible buses at short circuit. The developed method is based on integral and energy principles of  mechanics. In order to increase accuracy of the calculation corrections factors are introduced in an explicit formula for calculation of maximum horizontal deviations. These factors have been obtained with the help of a computer program that realized numerical method for calculating closing-in of wires by flexible thread levels.Diagrams are constructed with the purpose to find ymax and criteria of electro-dynamic resistance of flexible buses (permissible impulse of electro-dynamic forces and current of electro-dynamic resistance is determined.

  16. SIMPLIFIED METHOD FOR CALCULATING CLOSING IN OF SWITCH-GEAR FLEXIBLE BUSES AT SHORT CIRCUIT BY IMPULSE OF ELECTRODYNAMIC FORCES

    OpenAIRE

    I. I. Sergey; E. G. Ponomarenko; W. M. Sammur; P. I. Klimkovich

    2005-01-01

    The paper contains description of a simplified method for calculating closing-in of switch-gear flexible buses at short circuit. The developed method is based on integral and energy principles of  mechanics. In order to increase accuracy of the calculation corrections factors are introduced in an explicit formula for calculation of maximum horizontal deviations. These factors have been obtained with the help of a computer program that realized numerical method for calculating closing-in of wi...

  17. Variability of particle number emissions from diesel and hybrid diesel-electric buses in real driving conditions.

    Science.gov (United States)

    Sonntag, Darrell B; Gao, H Oliver; Holmén, Britt A

    2008-08-01

    A linear mixed model was developed to quantify the variability of particle number emissions from transit buses tested in real-world driving conditions. Two conventional diesel buses and two hybrid diesel-electric buses were tested throughout 2004 under different aftertreatments, fuels, drivers, and bus routes. The mixed model controlled the confounding influence of factors inherent to on-board testing. Statistical tests showed that particle number emissions varied significantly according to the after treatment, bus route, driver, bus type, and daily temperature, with only minor variability attributable to differences between fuel types. The daily setup and operation of the sampling equipment (electrical low pressure impactor) and mini-dilution system contributed to 30-84% of the total random variability of particle measurements among tests with diesel oxidation catalysts. By controlling for the sampling day variability, the model better defined the differences in particle emissions among bus routes. In contrast, the low particle number emissions measured with diesel particle filters (decreased by over 99%) did not vary according to operating conditions or bus type but did vary substantially with ambient temperature.

  18. Influence of malfunctions of the maintenance activities on the urban buses fuel consumption

    Science.gov (United States)

    George, Crişan; Nicolae, Filip

    2014-06-01

    Optimization of activities with the aim to provide quality service in conditions of high profitability, is one of the main objectives chased by managers in transportation companies. As a consequence, directing the attention towards monitoring of maintenance activities of vehicles fleet, can achieve desired results. Two of the most important issues related to the maintenance activity, is the increase of reliability and reduction of fuel consumption of the vehicles fleet. Aforementioned actions represents a way forward for raising the quality and profitability of services offered. In this paper, the main ways of monitoring the fuel consumption, in order to reduce it and increase the reliability of transportation vehicles fleet, are presented. For the evaluation of the maintenance system and the degree of influence of malfunctions recorded on the fuel consumption, using the Pareto -ABC method, following case study on a fleet of buses for urban public transport has been conducted. Results obtained highlights the deficiencies of the maintenance process carried out and constitutes a solid base for the reorganization of the maintenance activity, involving preventive maintenance activities, in order to contribute decisively to the results targeted by the management of transport companies.

  19. A Model for the Stop Planning and Timetables of Customized Buses

    Science.gov (United States)

    Yang, Yang

    2017-01-01

    Customized buses (CBs) are a new mode of public transportation and an important part of diversified public transportation, providing advanced, attractive and user-led service. The operational activity of a CB is planned by aggregating space–time demand and similar passenger travel demands. Based on an analysis of domestic and international research and the current development of CBs in China and considering passenger travel data, this paper studies the problems associated with the operation of CBs, such as stop selection, line planning and timetables, and establishes a model for the stop planning and timetables of CBs. The improved immune genetic algorithm (IIGA) is used to solve the model with regard to the following: 1) multiple population design and transport operator design, 2) memory library design, 3) mutation probability design and crossover probability design, and 4) the fitness calculation of the gene segment. Finally, a real-world example in Beijing is calculated, and the model and solution results are verified and analyzed. The results illustrate that the IIGA solves the model and is superior to the basic genetic algorithm in terms of the number of passengers, travel time, average passenger travel time, average passenger arrival time ahead of schedule and total line revenue. This study covers the key issues involving operational systems of CBs, combines theoretical research and empirical analysis, and provides a theoretical foundation for the planning and operation of CBs. PMID:28056041

  20. Fuel Cell Buses in U.S. Transit Fleets: Current Status 2016

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, Leslie [National Renewable Energy Lab. (NREL), Golden, CO (United States); Post, Matthew [National Renewable Energy Lab. (NREL), Golden, CO (United States); Jeffers, Matthew [National Renewable Energy Lab. (NREL), Golden, CO (United States)

    2016-11-01

    This report, published annually, summarizes the progress of fuel cell electric bus development in the United States and discusses the achievements and challenges of introducing fuel cell propulsion in transit. The report provides a summary of results from evaluations performed by the National Renewable Energy Laboratory. Funding for this effort is provided by the U.S. Department of Energy's Fuel Cell Technologies Office within the Office of Energy Efficiency and Renewable Energy and by the U.S. Department of Transportation's Federal Transit Administration. The 2016 summary results primarily focus on the most recent year for each demonstration, from August 2015 through July 2016. The results for these buses account for more than 550,000 miles traveled and 59,500 hours of fuel cell power system operation. The primary results presented in the report are from three demonstrations of two different fuel-cell-dominant bus designs: Zero Emission Bay Area Demonstration Group led by Alameda-Contra Costa Transit District (AC Transit) in California; American Fuel Cell Bus Project at SunLine Transit Agency in California; and American Fuel Cell Bus Project at the University of California at Irvine.

  1. The life cycle assessment of alternative fuel chains for urban buses and trolleybuses.

    Science.gov (United States)

    Kliucininkas, L; Matulevicius, J; Martuzevicius, D

    2012-05-30

    This paper describes a comparative analysis of public transport alternatives in the city of Kaunas, Lithuania. An LCA (Life Cycle Assessment) inventory analysis of fuel chains was undertaken using the midi urban bus and a similar type of trolleybus. The inventory analysis of fuel chains followed the guidelines provided by the ISO 14040 and ISO 14044 standards. The ReCiPe Life Cycle Impact Assessment (LCIA) methodology was used to quantify weighted damage originating from five alternative fuel chains. The compressed biogas fuel chain had the lowest weighted damage value, namely 45.7 mPt/km, whereas weighted damage values of the fuel chains based on electricity generation for trolleybuses were 60.6 mPt/km (for natural gas) and 78.9 mPt/km (for heavy fuel oil). The diesel and compressed natural gas fuel chains exhibited considerably higher damage values of 114.2 mPt/km and 132.6 mPt/km, respectively. The comparative life cycle assessment of fuel chains suggested that biogas-powered buses and electric trolleybuses can be considered as the best alternatives to use when modernizing the public transport fleet in Kaunas.

  2. An analysis of accident data for franchised public buses in Hong Kong.

    Science.gov (United States)

    Evans, W A; Courtney, A J

    1985-10-01

    This paper analyses data on accidents involving franchised public buses operating in Hong Kong. The data were obtained from the Royal Hong Kong Police, the Hong Kong Government Transport Department, the two major franchised bus operators and international sources. The analysis includes an international comparison of accidents with emphasis on the situation in Hong Kong compared to urban areas in the United Kingdom. An attempt has been made to identify the characteristics of bus accidents; accident incidence has been related to time of day, day of the week, time of year, weather conditions, driver's age and experience, hours on duty and policy-reported cause. The results indicate that Hong Kong has a high accident rate compared to Japan, the U.K. and the U.S.A., with particularly high pedestrian involvement rates. Bus accidents peak at around 9:00 AM and 4:00 PM but the accident rate is high throughout the day. Monday and Saturday appear to have a higher than average accident rate. The variability of accident rate throughout the year does not seem to be significant and the accident rate does not appear to be influenced by weather conditions. Older, more experienced drivers generally have a safer driving record than their younger, less experienced colleagues. Accident occurrence is related to the time the driver has been on duty. The paper questions the reliability of police-reported accident causation data and suggests improvements in the design of the accident report form and in the training of police investigators. The relevance of the Hong Kong study for accident research in general is also discussed.

  3. Prediction of Emissions from Biodiesel Fueled Transit Buses Using Artificial Neural Networks

    Directory of Open Access Journals (Sweden)

    Abhisek Mudgal

    2011-06-01

    Full Text Available The growing demand of freight transportation and passenger cars has led to air pollution, green house gas emissions (especially CO2 and fuel supply concerns. Research has been carried out on biodiesel which is shown to generate lower emissions. However, the amount of emissions generated is not well understood which entails more vigorous data collection and development of emissions models. A comprehensive data collection plan was developed and emissions (NOx, HC, CO, CO2 and PM10 from biodiesel fueled transit buses were collected using a portable emissions measurement system (PEMS. Linear models were developed and tested for each emission. However, the models could not capture the emissions spikes well resulting in very low R2 values. Artificial neural networks (ANNs based models were then employed on this data because of their ability to handle nonlinearity and not requiring assumptions on the input data as needed by statistical models. Sensitivity analysis was performed on the input parameters, number of hidden layers, learning rate and learning algorithm to arrive at an optimum ANN architecture. The optimal architecture for this study was found to be two hidden layers with 50 hidden nodes for each of NOx, HC, CO, and PM and one hidden layer for CO2. The emissions were predicted using best-performance ANN models for each emission. Scatter-plots of observed versus predicted values showed R2 of 0.96, 0.94, 0.82, 0.98 and 0.78 for NOx, HC, CO, CO2 and PM emissions, respectively. Histogram on prediction error showed low frequency for large errors.

  4. Evaluating real-world CO2 and NOX emissions for public transit buses using a remote wireless on-board diagnostic (OBD) approach.

    Science.gov (United States)

    Yang, Liuhanzi; Zhang, Shaojun; Wu, Ye; Chen, Qizheng; Niu, Tianlin; Huang, Xu; Zhang, Shida; Zhang, Liangjun; Zhou, Yu; Hao, Jiming

    2016-11-01

    The challenge to mitigate real-world emissions from vehicles calls for powerful in-use compliance supervision. The remote on-board diagnostic (OBD) approach, with wireless data communications, is one of the promising next-generation monitoring methods. We collected second-by-second profiles of carbon dioxide (CO2) and nitrogen oxides (NOX) emissions, driving conditions and engine performance for three conventional diesel and three hybrid diesel buses participating in a remote OBD pilot program in Nanjing, China. Our results showed that the average CO2 emissions for conventional diesel and hybrid diesel buses were 816 ± 83 g km(-1) and 627 ± 54 g km(-1), respectively, under a typical driving pattern. An operating mode binning analysis indicated that CO2 emissions reduction by series-parallel hybrid technology was largely because of the significant benefits of the technology under the modes of low speed and low power demand. However, significantly higher CO2 emissions were observed for conventional diesel buses during rush hours, higher than 1200 g km(-1). The OBD data suggested no improvement in NOX emission reduction for hybrid buses compared with conventional buses; both were approximately 12 g km(-1) because of poor performance of the selective catalyst reduction (SCR) systems in the real world. Speed-dependent functions for real-world CO2 and NOX emissions were also constructed. The CO2 emissions of hybrid buses were much less sensitive to the average speed than conventional buses. If the average speed decreased from 20 km h(-1) to 10 km h(-1), the estimated CO2 emission factor for conventional buses would be increased by 34%. Such a change in speed would increase NOX emissions for conventional and hybrid buses by 38% and 56%, respectively. This paper demonstrates the useful features of the remote OBD system and can inform policy makers how to take advantage of these features in monitoring in-use vehicles.

  5. Tender for cleaning up business. New techniques and tender to reduce the emission of buses; Aanbesteding schoon busvervoer. Nieuwe technieken en aanbesteding bieden kansen voor emissiereductie bij bussen

    Energy Technology Data Exchange (ETDEWEB)

    Dorel, F.G.; Van den Broek, C.B.W.; Jansen, L. [Provincie Zuid-Holland, The Hague (Netherlands)

    2000-03-01

    Air pollution in urban areas in the Netherlands still causes health-problems, and the present air quality does not meet the new standards in the European Union. Every part of society (industry, traffic etc.) therefore has to contribute in reducing emissions. Regarding buses there are several options. New buses can be build with an engine suitable for LPG, or new and existing diesel buses can be equipped with so called 'Continuous Regenerating Traps' (CRT-filters). This article focuses on the new possibility of provinces and municipalities in the Netherlands to facilitate the introduction of these new techniques. For the first time, these governments are planning to call for tenders of bus companies publicly. In order to be granted permission to provide public transport in a certain area, a bus company has to agree upon reducing its present average bus emissions to a certain (fixed) extent. 10 refs.

  6. Cost Effectiveness Analysis of Quasi-In-Motion Wireless Power Transfer for Plug-In Hybrid Electric Transit Buses from Fleet Perspective

    Energy Technology Data Exchange (ETDEWEB)

    Wang, Lijuan; Gonder, Jeff; Brooker, Aaron; Meintz, Andrew; Konan, Arnaud; Markel, Tony

    2016-05-16

    This study evaluated the costs and benefits associated with the use of stationary-wireless-power-transfer-enabled plug-in hybrid electric buses and determined the cost effectiveness relative to conventional buses and hybrid electric buses. A factorial design was performed over a number of different battery sizes, charging power levels, and f bus stop charging stations. The net present costs were calculated for each vehicle design and provided the basis for design evaluation. In all cases, given the assumed economic conditions, the conventional bus achieved the lowest net present cost while the optimal plug-in hybrid electric bus scenario beat out the hybrid electric comparison scenario. The parameter sensitivity was also investigated under favorable and unfavorable market penetration assumptions.

  7. New energy-saving and environmentally friendly technologies for buses and trucks; Nieuwe energiezuinige en milieuvriendelijke technologien voor bussen en vracthtwagens

    Energy Technology Data Exchange (ETDEWEB)

    Craps, R.; De Keukeleere, D.; Lenaers, G.

    1998-09-01

    The point of departure was the statement that people find public transport buses highly polluting. A lot of attention went to the advantages and the disadvantages of buses and trucks on liquefied petroleum gas (LPG) and natural gas. These fuels don`t cause any particle emissions from the combustion process. To quantify the other environmental advantages of gas technology, the Flemish Institute for Technological Research (VITO) carried out measurements of different bus technologies. Fuel consumption, emission of nitrogen oxides, carbon monoxides and hydrocarbons of 8 buses were measured in the Brussels traffic. 3 technologies of the early nineties were taken as a reference: the Euro-1 diesel, the current Brussels public transport company natural gas bus and a LPG bus. Comparisons were made with the modern diesel bus (Euro-2) and the newest buses on natural gas and LPG. To achieve minimal emissions, the best available technology for buses on natural gas or LPG is multipoint injection, the constructors of engines for heavy-duty traffic are changing from carburetor to fuel injection. The best available gas technologies has emissions that can be 50 to 95 per cent lower than the most modern diesel bus. Users mentioned problems at the introduction of vehicles on gas, such as lower reliability and availability. The cost price continues to be a disadvantage of buses and trucks on gas. The extra consumption of fuel doesn`t necessarily imply higher costs. Often fuel suppliers and distributors offer a favourable unit price, which includes the cost for the infrastructure. The purchase price of the vehicle remains higher and the workplaces must be adjusted for maintenance and repairs of vehicles on gas. The bus or truck on diesel is very reliable and cheaper to use than a similar vehicle on gas. The environmental perspectives are much less marked. Heavy-duty traffic emits nitrogen oxides and particles. With respect to these harmful substances in particular, constructors must

  8. Evaluation of the use of bioethanol fuelled buses based on ambient air pollution screening and on-road measurements.

    Science.gov (United States)

    López-Aparicio, S; Hak, C

    2013-05-01

    Mitigation measures to reduce greenhouse gas emissions may have adverse effects on urban air quality and human exposure to harmful pollutants. The use of bioethanol fuelled vehicles is increasing worldwide and may create new undesired pollution effects. Different measurement campaigns were performed in a pilot study to contribute to the understanding of the consequences associated with the use of bioethanol blended fuel (E95) on a series of pollutants. Ambient screening measurements of NO2, O3, acetic acid, formaldehyde and acetaldehyde were performed at different urban locations, exposed and not exposed to the circulation of bioethanol buses. In addition, volatile organic compounds were measured at the exhaust pipe of a bioethanol fuelled bus, both under idling conditions (carbonyls; DNPH cartridge) and under on-road driving conditions applying online monitoring (PTR-TOF). Higher ambient acetaldehyde values were measured at locations exposed to bioethanol fuelled buses than at locations not exposed, and very high acetaldehyde and acetic acid values were measured from the exhaust pipe during driving conditions (acetaldehyde>150 ppm; acetic acid ≈ 20-30 ppm) and modelled at close distance to the bioethanol bus. Human exposure to high concentration of acetaldehyde is expected, and it may involve a significantly increased chance in developing cancer. The high concentration of acetic acid will involve odour annoyance and significant material degradation or corrosion.

  9. Seat Belts in School Buses: A Study by the Wisconsin Department of Public Instruction Prepared for the Wisconsin Legislature: S.B.7. Bulletin No. 9078.

    Science.gov (United States)

    Richards, William T.

    The hypothesis of this study was that installation and use of seat belts in all large school buses are needed to prevent injuries and deaths to children in accidents as a result of no seat belts. Basic questions and summary arguments for and against the use of seat belts are listed. An analysis of research studies done on seat belts in school…

  10. Robust Clamping Force Control of an Electro-Mechanical Brake System for Application to Commercial City Buses

    Directory of Open Access Journals (Sweden)

    Sangjune Eum

    2017-02-01

    Full Text Available This paper proposes a sensor-less robust force control method for improving the control performance of an electro-mechanical brake (EMB which is applicable to commercial city buses. The EMB generates the accurate clamping force commanded by a driver through an independent motor control at each wheel instead of using existing mechanical components. In general, an EMB undergoes parameter variation and a backdrivability problem. For this reason, the cascade control strategy (e.g., force-position cascade control structure is proposed and the disturbance observer is employed to enhance control robustness against model variations. Additionally, this paper proposed the clamping force estimation method for a sensor-less control, i.e., the clamping force observer (CFO. Finally, in order to confirm the performance and effectiveness of a proposed robust control method, several experiments are performed and analyzed.

  11. Real-world operation conditions and on-road emissions of Beijing diesel buses measured by using portable emission measurement system and electric low-pressure impactor.

    Science.gov (United States)

    Liu, Zhihua; Ge, Yunshan; Johnson, Kent C; Shah, Asad Naeem; Tan, Jianwei; Wang, Chu; Yu, Linxiao

    2011-03-15

    On-road measurement is an effective method to investigate real-world emissions generated from vehicles and estimate the difference between engine certification cycles and real-world operating conditions. This study presents the results of on-road measurements collected from urban buses which propelled by diesel engine in Beijing city. Two widely used Euro III emission level buses and two Euro IV emission level buses were chosen to perform on-road emission measurements using portable emission measurement system (PEMS) for gaseous pollutant and Electric Low Pressure Impactor (ELPI) for particulate matter (PM) number emissions. The results indicate that considerable discrepancies of engine operating conditions between real-world driving cycles and engine certification cycles have been observed. Under real-world operating conditions, carbon monoxide (CO) and hydrocarbon (HC) emissions can easily meet their respective regulations limits, while brake specification nitrogen oxide (bsNO(x)) emissions present a significant deviation from its corresponding limit. Compared with standard limits, the real-world bsNO(x) emission of the two Euro III emission level buses approximately increased by 60% and 120% respectively, and bsNO(x) of two Euro IV buses nearly twice standard limits because Selective Catalytic Reduction (SCR) system not active under low exhaust temperature. Particle mass were estimated via particle size distribution with the assumption that particle density and diameter is liner. The results demonstrate that nanometer size particulate matter make significant contribution to total particle number but play a minor role to total particle mass. It is suggested that specific certified cycle should be developed to regulate bus engines emissions on the test bench or use PEMS to control the bus emissions under real-world operating conditions.

  12. Real-world emissions and fuel consumption of diesel buses and trucks in Macao: From on-road measurement to policy implications

    Science.gov (United States)

    Wu, Xiaomeng; Zhang, Shaojun; Wu, Ye; Li, Zhenhua; Zhou, Yu; Fu, Lixin; Hao, Jiming

    2015-11-01

    A total of 13 diesel buses and 12 diesel trucks in Macao were tested using portable emission measurement systems (PEMS) including a SEMTECH-DS for gaseous emissions and a SEMTECH-PPMD for PM2.5. The average emission rates of gaseous pollutants and CO2 are developed with the operating mode defined by the instantaneous vehicle specific power (VSP) and vehicle speed. Both distance-based and fuel mass-based emission factors for gaseous pollutants (e.g., CO, THC and NOX) are further estimated under typical driving conditions. The average distance-based NOX emission of heavy-duty buses (HDBs) is higher than 13 g km-1. Considering the unfavorable conditions for selective reductions catalyst (SCR) systems, such as low-speed driving conditions, more effective technology options (e.g., dedicated natural gas buses and electric buses) should be considered by policy makers in Macao. We identified strong effects of the vehicle size, engine displacement and driving conditions on real-world CO2 emission factors and fuel consumption for diesel vehicles. Therefore, detailed profiles regarding vehicle specifications can reduce the uncertainty in their fleet-average on-road fuel consumption. In addition, strong correlations between relative emission factors and driving conditions indicated by the average speed of generated micro-trips are identified based on a micro-trip method. For example, distance-based emission factors of HDBs will increase by 39% for CO, 29% for THC, 43% for NOX and 26% for CO2 when the average speed decreases from 30 km h-1 to 20 km h-1. The mitigation of on-road emissions from diesel buses and trucks by improving traffic conditions through effective traffic and economic management measures is therefore required. This study demonstrates the important role of PEMS in understanding vehicle emissions and mitigation strategies from science to policy perspectives.

  13. Evaluation of city buses installed diesel particulate filter systems on fleet test; Diesel particulate filter system wo tosaishita rosen bus no soko chosa

    Energy Technology Data Exchange (ETDEWEB)

    Sudo, H. [Japan Automobile Research Institute Inc., Tsukuba (Japan)

    1997-10-01

    An environmental air quality of suspended particulate matter is insufficient in the big city area. To reduce the particulate matter, improvement of engine and development of the Diesel Particulate Filter (DPF) system are carrying. The purpose of this report is to investigate a possibility of practical use of the city buses installed DPF systems. From March 1995, investigation for practical use of these DPF systems on a route buses was carried in regular service operation of the Tokyo and Yokohama Transportation Bureau. The investigation items are service situation, smoke density and preparation inspection. From the result for 2 years service operation, each DPF systems needed some failure correspondence. but these were not fatal problem on using the DPF system. Then the subject of relative to durability and reliability became clear, and the performance of a low particulate emission DPF system obtained the high value evaluation for users. 9 refs., 4 figs., 2 tabs.

  14. 佛山市发展公交车尾气削减潜力分析%Emission Reduction Potentiality by Developing Buses in Foshan

    Institute of Scientific and Technical Information of China (English)

    包艳萍; 刘永红; 黄建彰; 徐伟嘉

    2013-01-01

    Emission factors of buses, motorcycles and passenger cars of Foshan City, Guangdong Province were calculated with COPERT Ⅳ model integrated with information regarding amounts and annual mileages, case analysis was done for their emission, environmental effects and emissions reduction potentiality of buses.Results indicated that buses emission in Foshan in 2011 was 804.57 t CO,283.85 t VOC,3 365.32 t NOx and 73.00 t PM.Emissions of CO and VOC of buses were less than that of motorcycles and passenger cars, but emission of NOx was more.Emission of buses for one person travelling one kilometer would decrease by 32.00%,51.43% and 57.50% by increasing the number of passengers from 17 to 25,35 and 45.Annual emissions could be reduced by 611.66 t CO, 151.6 t VOC, 1,231.18 t NOx and 58.39 t PM respectively by changing all the emission standard of diesel buses from lower to Euro Ⅳ.Annual emissions could be reduced by 293.71 t CO, 2 086.87 t NOx and 70.34 t PM by changing diesel buses to environmentally-friendly vehicle (EEV) CNG buses, but annual emissions of VOC increased by 228.01 t.%采用COPERTⅣ模型计算佛山市公交车、摩托车和小型客车排放因子,结合保有量、年平均行驶里程计算其排放量,对佛山市公交车出行环境效果及尾气削减潜力进行情景分析.结果表明:2011年佛山市公交车CO 、VOC 、NOx和PM的排放量为804.57、283.85、3 365.32和73.00 t.单人单次公交车出行CO和VOC的排放量较摩托车和小型客车低,但NOx则较高.公交车载客人数从17人上升至25、35、45人,单人单次出行每公里排放量分别下降32.00%、51.43%和57.50%.佛山市低排放标准的柴油公交车全部更换成国Ⅳ排放标准柴油车、CO、VOC、NOx和PM的年排放量分别削减611.66、151.6、1 231.18和58.39 t.EEV标准天然气公交车替代柴油公交车可减少NOx和PM的排放,但对VOC的削减并无优势.佛山市现有柴油公交车更换

  15. Preliminary study on field buses for the control system of the high voltage of the ATLAS hadronic calorimeter; Etude preliminaire d`un reseau de terrain pour le systeme de controle des hautes tensions du calorimetre hadronique d`Atlas

    Energy Technology Data Exchange (ETDEWEB)

    Drevet, F.; Chadelas, R.; Montarou, G.

    1996-12-31

    We present here after a preliminary study on field buses for the control system of the high voltage of the photomultipliers of the TILECAL calorimeter. After some generalities, different commercial buses are reviewed (CAN, ARCET, WorldFIP, Profibus and LonWorks). The Profibus and LonWorks solution are more extensively studies as a possible solution for the high voltage system of the TILE hadronic calorimeter. (authors).

  16. Technological capability assessment of suppliers to support product development: case study on a buses and coaches manufacturer

    Directory of Open Access Journals (Sweden)

    Lucas Comerlato

    2013-05-01

    Full Text Available Supply chain management has become a critical issue in the global collaboration scenario. Suppliers are not expected to provide just commodities or pre-defined components, but also collaborative engineering design solutions within the product development cycle. Thus, the selection criteria for defining supply partner go beyond the production and logistic capabilities, but must also include technical and engineering competence. This, in some sense, can be considered a common scenario of big companies, but is still challenging when dealing with SME´s. This work discusses how SME´s can be included in a supply chains taking in consideration a set of parameters to assess their technical competence related to product development collaboration. A set of eight parameters has been proposed to assess the engineering team competence, physical and technological structure and further legal responsibility. For each parameter values and weights were defined also. The assessment was applied to three companies that are suppliers of a buses and coaches manufacturer from Rio Grande do Sul, Brazil. The results show that even when dealing with objective parameters, the suppliers and costumer can have different perceptions about same issues.

  17. Design of a Mobile Low-Cost Sensor Network Using Urban Buses for Real-Time Ubiquitous Noise Monitoring.

    Science.gov (United States)

    Alsina-Pagès, Rosa Ma; Hernandez-Jayo, Unai; Alías, Francesc; Angulo, Ignacio

    2016-12-29

    One of the main priorities of smart cities is improving the quality of life of their inhabitants. Traffic noise is one of the pollutant sources that causes a negative impact on the quality of life of citizens, which is gaining attention among authorities. The European Commission has promoted the Environmental Noise Directive 2002/49/EC (END) to inform citizens and to prevent the harmful effects of noise exposure. The measure of acoustic levels using noise maps is a strategic issue in the END action plan. Noise maps are typically calculated by computing the average noise during one year and updated every five years. Hence, the implementation of dynamic noise mapping systems could lead to short-term plan actions, besides helping to better understand the evolution of noise levels along time. Recently, some projects have started the monitoring of noise levels in urban areas by means of acoustic sensor networks settled in strategic locations across the city, while others have taken advantage of collaborative citizen sensing mobile applications. In this paper, we describe the design of an acoustic low-cost sensor network installed on public buses to measure the traffic noise in the city in real time. Moreover, the challenges that a ubiquitous bus acoustic measurement system entails are enumerated and discussed. Specifically, the analysis takes into account the feature extraction of the audio signal, the identification and separation of the road traffic noise from urban traffic noise, the hardware platform to measure and process the acoustic signal, the connectivity between the several nodes of the acoustic sensor network to store the data and, finally, the noise maps' generation process. The implementation and evaluation of the proposal in a real-life scenario is left for future work.

  18. Report on FS survey for project of introduction of highly energy-efficient trolley buses into the Mexico Metropolitan Area in FY 1997; 1997 nendo chosa hokokusho (Mexico city eno sho energy gata trolley bus donyu project FS chosa)

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1998-03-01

    Traffic jam and air pollution by automobiles are currently getting severe in the Mexico Metropolitan Area. Trolley buses were introduced for improving the environment more than ten years ago. Vehicles become too old for use, and their energy efficiency is low. In this project, 200 highly energy-efficient trolley buses are introduced to replace old inefficient trolley buses, which results in the improved traffic convenience in the City and enhanced energy efficiency. The new energy-efficient trolley buses are made of energy-efficient control VVVF inverters produced and exported by MELCO (Mitsubishi Electric Corporation), energy-efficient motors by MELMEX (Mitsubishi Electric Corporation, Mexico), and bodies by MASA which is a major manufacturer of bus bodies. The objective of this research is to analyze the background of introduction of new energy-efficient trolley buses and the effects of the present project. The results of analysis are going to be utilized for future promotion of the Joint Implementation and Clean Development Mechanism. 30 refs., 30 figs., 24 tabs.

  19. Alternative Energy Busing

    Science.gov (United States)

    LaFee, Scott

    2012-01-01

    In recent years, school districts have converted portions of their bus fleets to cleaner-burning, sometimes cheaper, alternative fossil fuels, such as compressed natural gas or propane. Others have adopted biodiesel, which combines regular diesel with fuel derived from organic sources, usually vegetable oils or animal fats. The number of biodiesel…

  20. Buses, Bikes or Boots

    Institute of Scientific and Technical Information of China (English)

    MICHAEL O'NEAL

    2010-01-01

    @@ If you have been in Beijing for any length of time, you will have come to realize that there are several modes of trans-portation available to commuters, all of them relatively inexpensive, especially when compared to fares in the Western world. The choice is not only a matter of frugality, but also of convenience, comfort and speed.

  1. Making the Buses Run.

    Science.gov (United States)

    Fickes, Michael

    1998-01-01

    Examines issues concerning outsourcing student transportation services: cost; management needs and capabilities; goals; and politics. Critical areas of transportation management are highlighted such as personnel management, student management and discipline, risk management, fleet analysis, and routing and scheduling. (GR)

  2. Gaseous and particulate composition of fresh and aged emissions of diesel, RME and CNG buses using Chemical Ionization Mass Spectrometry

    Science.gov (United States)

    Psichoudaki, Magda; Le Breton, Michael; Hallquist, Mattias; Watne, Ågot; Hallquist, Asa

    2016-04-01

    Urban air pollution is becoming a significant global problem, especially for large cities around the world. Traffic emissions contribute significantly to both elevated particle concentrations and to gaseous pollutants in cities. The latter also have the potential of forming more particulate mass via their photochemical oxidation in the atmosphere. The International Agency for Research on Cancer and the US EPA have characterised diesel exhausts as a likely human carcinogen that can also contribute to other health problems. In order to meet the challenges with increased transportation and enhanced greenhouse gas emissions, the European Union have decided on a 10% substitution of traditional fuels in the road transport sector by alternative fuels (e.g. biodiesel, CNG) before the year 2020. However, it is also important to study the influence of fuel switches on other primary pollutants as well as the potential to form secondary aerosol mass. This work focuses on the characterisation of the chemical composition of the gas and the condensed phase of fresh bus emissions during acceleration, in order to mimic the exhaust plume that humans would inhale under realistic conditions. In addition, photochemical aging of the exhaust emissions was achieved by employing a Potential Aerosol Mass (PAM) flow reactor, allowing the characterization of the composition of the corresponding aged emissions. The PAM reactor uses UV lamps and high concentrations of oxidants (OH radicals and O3) to oxidize the organic species present in the chamber. The oxidation that takes place within the reactor can be equivalent to up to one week of atmospheric oxidation. Preliminary tests showed that the oxidation employed in these measurements corresponded to a range from 4 to 8 days in the atmosphere. During June and July 2015, a total of 29 buses, 5 diesel, 13 CNG and 11 RME (rapeseed methyl ester), were tested in two different locations with limited influence from other types of emissions and traffic

  3. [Working conditions on public buses and common mental disorders among drivers and fare collectors: Greater Metropolitan Belo Horizonte, Minas Gerais State, Brazil, 2012].

    Science.gov (United States)

    Assunção, Ada Ávila; Silva, Luiz Sérgio; Silva, Luiz Sérgio da

    2013-12-01

    Common mental disorders (CMD) contribute to overall burden of disease. The current study aimed to describe the prevalence of CMD among a sample of bus drivers and fare collectors in Greater Metropolitan Belo Horizonte, Minas Gerais State, Brazil, and investigate whether traffic conditions and conditions inside buses were associated with the outcome. This non-probabilistic sample of 1,607 workers was estimated from the size of the effective workforce (n = 17,470). Face-to-face interviews used a digital questionnaire with online data processing. Overall prevalence of CMD was 23.6%. Bad traffic conditions lost statistical significance in the multivariate analysis, while higher income and adverse working conditions and inadequate safety remained associated with the outcome. Harmful behavior and vulnerable health situations were associated with CMD. This study of urban bus workers' health is a unique contribution that can provide backing for public policies targeting metropolitan populations.

  4. 循环球式电动助力转向器在纯电动客车上的应用%Application of Circulating Ball Type Electric Power Steering Gear to Pure Electric Buses

    Institute of Scientific and Technical Information of China (English)

    叶成友

    2015-01-01

    In view of the problems of the traditional circulating ball type steering gear now used in pure electric bus-es, such as difficult arrangement, high cost and great electric power consumption,the author introduces a circulating ball type electric power steering gear on pure electric buses.%针对目前纯电动客车上采用的传统循环球式转向器存在布置难度大、成本高、耗电量大等问题,介绍一种循环球式电动助力转向器在纯电动客车上的解决方案。

  5. Natural gas engines; An eco-friendly alternative for buses, communal and distribution vehicles. Erdgasmotoren; Eine umweltfreundliche Alternative fuer Busse, Kommunal- und Verteilerfahrzeuge

    Energy Technology Data Exchange (ETDEWEB)

    Signer, M. (Iveco Motorenforschung AG, Arbon (Switzerland))

    1994-01-01

    Natural gas engines for buses, communal and distribution vehicles are an eco-friendly alternative. The exhaust emission values are distinctly lower than the Euro 2-Limit Values for 1995/1996 and lower than the discussed Euro 3 limits. As a result of the change to spark ignition and the reduced engine efficiency obtained, the natural gas engines consume 20 and more per cent energy. The CO[sub 2] emission are, however, comparable with those of a diesel engine. The vehicle fuel tanks are voluminous and heavy. Compromises must be made for the installation in vehicles which results in a reduction of the payload. Cost-favourable and lighter tanks would increase the attractivity of such vehicles. The natural gas vehicle is, at least today, dependent on a central refueling system (compressor station) at the vehicle operator or in his nearer neighbourhood. For the general and flexible operation of any type of utility vehicle, the diesel engine is and remains the optimum solution in view of ecology and economy. (orig.)

  6. The Research of Electric Buses Power Plant Charging Optimization Based on Load Shifting%考虑削峰填谷的电动公交换电站充电优化研究

    Institute of Scientific and Technical Information of China (English)

    苗淼; 雷霞; 何建平; 李菲

    2015-01-01

    The electric buses which work in battery swapping mode achieve rapid growth in the field of public transportation. The normal operation of electric buses power plant is related to many factors, such as the replacement of the battery,battery charging and power load and so on. In order to improve the economy of power plant operation, the daily charging demands of electric buses are ana-lyzed and calculated. We set up the charging model of double objective optimization considering load shifting to minimum the charging costand reduce the load fluctuation. Lastly, the weight factor transformation method is utilized to analyze the example based on genetic algorithm and the simulation results show that the optimized charging cost can be saved 30 % with the sharpening peak effect.%采用换电模式的电动公交车在公共交通领域内发展迅速。电动公交换电站的正常运营与电池更换、充电和电网负荷等多方面因素有关。为提高电动公交换电站运营的经济性,首先分析和计算电动公交车的日换电量需求,然后以充电成本最小和减小负荷波动为目标建立考虑削峰填谷作用的双目标充电优化模型,最后利用遗传算法的权重系数变换法对实例进行求解。实例仿真计算结果表明,优化后的充电成本可节约30%,同时达到削峰填谷作用。

  7. Fatigue-related crashes involving express buses in Malaysia: will the proposed policy of banning the early-hour operation reduce fatigue-related crashes and benefit overall road safety?

    Science.gov (United States)

    Mohamed, Norlen; Mohd-Yusoff, Mohammad-Fadhli; Othman, Ilhamah; Zulkipli, Zarir-Hafiz; Osman, Mohd Rasid; Voon, Wong Shaw

    2012-03-01

    Fatigue-related crashes have long been the topic of discussion and study worldwide. The relationship between fatigue-related crashes and time of day is well documented. In Malaysia, the possibility of banning express buses from operating during the early-hours of the morning has emerged as an important consideration for passenger safety. This paper highlights the findings of an impact assessment study. The study was conducted to determine all possible impacts prior to the government making any decision on the proposed banning. This study is an example of a simple and inexpensive approach that may influence future policy-making process. The impact assessment comprised two major steps. The first step involved profiling existing operation scenarios, gathering information on crashes involving public express buses and stakeholders' views. The second step involved a qualitative impact assessment analysis using all information gathered during the profiling stage to describe the possible impacts. Based on the assessment, the move to ban early-hour operations could possibly result in further negative impacts on the overall road safety agenda. These negative impacts may occur if the fundamental issues, such as driving and working hours, and the need for rest and sleep facilities for drivers, are not addressed. In addition, a safer and more accessible public transportation system as an alternative for those who choose to travel at night would be required. The proposed banning of early-hour operations is also not a feasible solution for sustainability of express bus operations in Malaysia, especially for those operating long journeys. The paper concludes by highlighting the need to design a more holistic approach for preventing fatigue-related crashes involving express buses in Malaysia.

  8. Uncertainty in particle number modal analysis during transient operation of compressed natural gas, diesel, and trap-equipped diesel transit buses.

    Science.gov (United States)

    Holmén, Britt A; Qu, Yingge

    2004-04-15

    The relationships between transient vehicle operation and ultrafine particle emissions are not well-known, especially for low-emission alternative bus technologies such as compressed natural gas (CNG) and diesel buses equipped with particulate filters/traps (TRAP). In this study, real-time particle number concentrations measured on a nominal 5 s average basis using an electrical low pressure impactor (ELPI) for these two bus technologies are compared to that of a baseline catalyst-equipped diesel bus operated on ultralow sulfur fuel (BASE) using dynamometer testing. Particle emissions were consistently 2 orders of magnitude lower for the CNG and TRAP compared to BASE on all driving cycles. Time-resolved total particle numbers were examined in terms of sampling factors identified as affecting the ability of ELPI to quantify the particulate matter number emissions for low-emitting vehicles such as CNG and TRAP as a function of vehicle driving mode. Key factors were instrument sensitivity and dilution ratio, alignment of particle and vehicle operating data, sampling train background particles, and cycle-to-cycle variability due to vehicle, engine, after-treatment, or driver behavior. In-cycle variability on the central business district (CBD) cycle was highest for the TRAP configuration, but this could not be attributed to the ELPI sensitivity issues observed for TRAP-IDLE measurements. Elevated TRAP emissions coincided with low exhaust temperature, suggesting on-road real-world particulate filter performance can be evaluated by monitoring exhaust temperature. Nonunique particle emission maps indicate that measures other than vehicle speed and acceleration are necessary to model disaggregated real-time particle emissions. Further testing on a wide variety of test cycles is needed to evaluate the relative importance of the time history of vehicle operation and the hysteresis of the sampling train/dilution tunnel on ultrafine particle emissions. Future studies should

  9. Diseño de un entorno educativo heterogéneo de buses de campo y supervisión remota para procesos de automatización industrial

    OpenAIRE

    Medina Garcia, José Luis; Gallardo León, Juan Antonio; Berbel Artal, Néstor; Salvador Sola, Antonio

    2009-01-01

    El documento presenta la estructura de un laboratorio de automatización industrial enfocado a la enseñanza y aprendizaje de entornos de comunicación, control y supervisión industrial. La aplicación práctica de los conocimientos sobre un entorno real de fabricación, permite poner a disposición del alumno una serie de equipos de comunicación en los buses de campo estándar (Profibus, CanOpen y AS-i), así como de las tecnologías de comunicación Ethernet para desarrollar proyectos de automatizació...

  10. Modeling Modal Shift of Car Travelers to Buses Based on Public Transport Priority%基于公交优先的小汽车出行向公交转移模型研究

    Institute of Scientific and Technical Information of China (English)

    左忠义; 杨广川; 邵春福

    2012-01-01

    在实施公交优先政策时,往往因没有对公交专用道和社会车道所应分担的交通量做出正确的估算而造成道路资源的浪费,以至于无法真正实现公交优先的目的.本文以公交车与社会车辆的行程速度差异为研究对象,通过分析设置公交专用道后两种交通方式间的转移情况,在保证公交车服务水平的前提下基于路阻函数研究了不同公交车比例下公交车和社会车辆的行程速度曲线,并确立了小汽车向公交车的转移关系.研究结果表明,针对不同的居民出行量及模型参数值,公交车在一定的比例范围内时小汽车用户选择公交出行,并使道路交通系统达到最优.该模型可应用于城市现有道路改造时公交专用道设置及确定公交车发车间隔的参考依据.%For the implementation of public transport priority, the deviation on estimating traffic flow assignment to bus lane and general lanes may lead to the waste of road space resource, consequently fail to achieve the goal of public transport priority. In this paper, the differences between travel speed of buses and cars and modal shift relationship are explored. A travel speed curve of bus and car speed variation under various bus proportion is obtained based on road impedance function. The result shows that in accordance with distinct passenger trip volumes and modal parameter values, there is an appropriate range of bus. Within this range, car travelers are willing to shift to buses, and road traffic system can be optimized as well. The proposed model serves the installation of bus lane on existing urban roads together with determining the bus dispatch interval.

  11. Determination of the transient parameters of synchronous machines by the finite element method considering the characteristic effect in the shock absorber buses; Determinacao dos parametros transitorios de maquinas sincronas pelo metodo dos elementos finitos considerando o efeito pelicular nas barras amortecedoras

    Energy Technology Data Exchange (ETDEWEB)

    Nabeta, Silvio Ikuyo; Cardoso, Jose Roberto [Sao Paulo Univ., SP (Brazil). Escola Politecnica; Foggia, Albert; Coulomb, Jean Louis; Reyne, Gilbert [Institut National Polytechnique, 38 - Grenoble (France)

    1995-12-31

    This work presents the determination of the parameters of a hydro generator through the simulation of the frequency response test. The special characteristic of this work is that it takes into consideration shock absorbers buses, which are sites of induced currents when the peculiar effect is present and require that sub-transients parameters are analysed. Simulation results are analysed and compared to the obtained values when the traditional three-phase short circuit test is used 8 figs., 2 tabs., 13 refs.

  12. Analysis of production models and hydrogen supply for urban collective transportation buses: a case study at Foz do Iguacu; Analise de modelos de producao e abastecimento de hidrogenio para onibus de transporte coletivo urbano: estudo de caso em Foz do Iguacu

    Energy Technology Data Exchange (ETDEWEB)

    Riveros-Godoy, Gustavo [Universidade Nacional de Assuncao (Paraguay). Faculdade de Ciencias Quimicas]. E-mail: riveros@qui.una.py; Cavaliero, Carla; Peres, Ennio [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Faculdade de Engenharia Mecanica

    2008-07-01

    Even though technical-economical barriers still exist for the development of an economy based in the hydrogen, these difficulties are opportunities for the appearance of new business of goods and services, energetic matrix diversification, focusing of researches activities, development and support to provide sustainability to the new economy. This study presents the technical-economical comparison of hydrogen production and supply models, using the so-called Spilled Turbinable Energy of the Itaipu Hydroelectric Power Plant and available for the transport sector. The substitution of the urban collective diesel bus fleet with fuel cell buses in Foz do Iguacu city was used as a case study in this work. (author)

  13. Buses and Boards Making the right choice

    CERN Document Server

    Gipper, Jerry

    2009-01-01

    From motherboard to backplane to blade based computer systems, the choices are numerous. This paper will cover the markets and trends within those markets that influence decisions made by board suppliers. Discussion will focus on the various form factors, the development and evolution of industry standards, and the consortia that support and develop these standards, including VITA, PICMG, and others. This paper will conclude with suggestions for choosing the right form factor for your application.

  14. Snow, buses, and mobile data services

    DEFF Research Database (Denmark)

    Fomin, Vladislav

    2006-01-01

    and Daniel Robey [2002], in wich the authors use anecdotes to demonstrate what advanced service possibilities are afforded by ubiquitous technology as contrasted to the residue of social behavior.This story illustrates that the succes of establishing Information Society should not be measured by the number...... of available services to citizens over the wireline and mobile Internet. The ultimate measure for success must be the extent to which poeple are aware about the availability of relevant content and are using the services [Daniel and Wilson, 2003, p.285]....

  15. High Energy Batteries for Hybrid Buses

    Energy Technology Data Exchange (ETDEWEB)

    Bruce Lu

    2010-12-31

    EnerDel batteries have already been employed successfully for electric vehicle (EV) applications. Compared to EV applications, hybrid electric vehicle (HEV) bus applications may be less stressful, but are still quite demanding, especially compared to battery applications for consumer products. This program evaluated EnerDel cell and pack system technologies with three different chemistries using real world HEV-Bus drive cycles recorded in three markets covering cold, hot, and mild climates. Cells were designed, developed, and fabricated using each of the following three chemistries: (1) Lithium nickel manganese cobalt oxide (NMC) - hard carbon (HC); (2) Lithium manganese oxide (LMO) - HC; and (3) LMO - lithium titanium oxide (LTO) cells. For each cell chemistry, battery pack systems integrated with an EnerDel battery management system (BMS) were successfully constructed with the following features: real time current monitoring, cell and pack voltage monitoring, cell and pack temperature monitoring, pack state of charge (SOC) reporting, cell balancing, and over voltage protection. These features are all necessary functions for real-world HEV-Bus applications. Drive cycle test data was collected for each of the three cell chemistries using real world drive profiles under hot, mild, and cold climate conditions representing cities like Houston, Seattle, and Minneapolis, respectively. We successfully tested the battery packs using real-world HEV-Bus drive profiles under these various climate conditions. The NMC-HC and LMO-HC based packs successfully completed the drive cycles, while the LMO-LTO based pack did not finish the preliminary testing for the drive cycles. It was concluded that the LMO-HC chemistry is optimal for the hot or mild climates, while the NMC-HC chemistry is optimal for the cold climate. In summary, the objectives were successfully accomplished at the conclusion of the project. This program provided technical data to DOE and the public for assessing EnerDel technology, and helps DOE to evaluate the merits of underlying technology. The successful completion of this program demonstrated the capability of EnerDel battery packs to satisfactorily supply all power and energy requirements of a real-world HEV-Bus drive profile. This program supports green solutions to metropolitan public transportation problems by demonstrating the effectiveness of EnerDel lithium ion batteries for HEV-Bus applications.

  16. Seat Belt Usage on School Buses.

    Science.gov (United States)

    Farmer, Ernest

    1985-01-01

    Studies on seat belt usage conducted under contract with governmental organizations or prepared by professional societies, state and local organizations, and transportation specialists have made significant contributions, but none has successfully resolved the issue. (MLF)

  17. 一种适用于具有弱环网和PV节点的配电网的增广雅可比矩阵潮流法%An Augmented Jacobian Method for Power Flow Analysis of Weakly Looped Distribution Systems with PV Buses

    Institute of Scientific and Technical Information of China (English)

    陈星莺; 余昆; 单渊达

    2002-01-01

    针对带弱环网和PV节点的配电网提出了一种增广雅可比矩阵潮流计算方法.将弱环网和PV节点的边界条件嵌入到雅可比矩阵中,并对雅可比矩阵的因子分解进行了详尽的设计.仿真结果表明了该算法的鲁棒性和计算效率.%A power flow analysis method for weakly looped distribution systems with PV buses is proposed in this paper. The proposed method is computationally more efficient and more robust compared with the conventional compensation methods. The robustness is achieved by embedding the boundary conditions of loops and PV buses into the Jacobian matrix. The computational efficiency is achieved by the carefully designed factorization of Jacobian matrix. Test results on a 33-bus system are presented.

  18. Analysis of Testing and Matching of Braking Energy Recovery System of Hydraulic Energy Storage Type Buses%液压蓄能式公共汽车制动能量回收系统匹配与试验分析

    Institute of Scientific and Technical Information of China (English)

    曲金玉; 王儒; 任传波; 韩尔睴; 刘林

    2014-01-01

    针对城市公共汽车运行的特殊工况,设计并研制了一种新型液压蓄能式制动能量回收系统,介绍了该制动能量回收系统的组成和工作原理,对液压系统主要部件参数进行了分析与匹配。通过台架和实车道路试验,结果表明:所设计的液压蓄能式制动能量回收系统在满足汽车运行安全的前提下,具有较高的制动能量回收率,对改善汽车的燃油经济性具有积极作用。%Aimed at the special condition of the city buses operation,a new type of hydraulic energy storage type braking energy recovery system was designed and developed.The composition and working principle of the brake energy recovery system was intro-duced,and the main components of the hydraulic system parameters were analyzed and matched.Finally,by the bench and vehicle re-fitting test,the results show that the design of the new hydraulic energy storage type braking energy regeneration system improved the braking energy recovery rate under the premise of safety operation,has positive effect on fuel economy improvement of automobile.

  19. 公益的徒劳--对福州公交节粮广告的修辞学分析%The futility of non-commercial advertisements--A rhetorical analysis of the food-saving advertisement broadcast on the TVs of Buses in Fuzhou

    Institute of Scientific and Technical Information of China (English)

    朱晓伟

    2013-01-01

    Public service advertisements are non-profit. They are playing a more and more important role in improving the social, spiritual and material civilization. A successful non-commercial advertisement makes full use of various rhetorical resources to persuade or convince the public. While the one which fail to do this is but futility. In this paper, the food-saving advertisement broadcast on the TVs of the buses in Fuzhou is introduced and analyzed. And then some suggestions concerning the improvement of such advertisements are provided.%公益广告是为社会服务的非营利性广告,其在促进社会精神文明、物质文明建设和社会进步方面发挥着日益重要的作用。成功的公益广告能够充分利用各种修辞资源以达到说服公众的目的,而没能调动各种修辞资源的公益广告往往是徒劳。本文中,笔者首先介绍了福州公交电视媒体播出的倡导节约粮食的公益广告,之后分析并总结了该类公益广告中存在的问题,最后,根据这些问题,提出了关于改良此类公益广告的若干建议。

  20. The MAN hydrogen propulsion system for city buses

    Energy Technology Data Exchange (ETDEWEB)

    Knorr, H.; Held, W.; Pruemm, W. [MAN Nutzfahrzeuge Aktiengesellschaft, Nuernberg (Germany); Ruediger, H. [Linde AG, Hoellriegelskreuth (Germany)

    1998-12-31

    MAN Nutzfahrzeuge Aktiengesellschaft has developed a hydrogen-powered bus as part of the Euro-Quebec Hydro-Hydrogen Pilot Project. The project is being sponsored by the European Union. The MAN hydrogen bus is based on a model SL standard-production city bus. The bus is driven by an internal combustion engine. The engine will run on either hydrogen or gasoline, to which end it has two independently-operating injection systems. The engine`s emission levels in both modes are well inside the applicable limits for commercial vehicles. The hydrogen is carried in the vehicle in liquid form at extremely low temperatures. The fuel tank system consists of three vacuum-insulated tanks, developed by Linde AG, who also developed the refueling system. A comprehensive safety concept has been compiled for the vehicle with the cooperation of TUV Bayern-Sachsen to ensure that the highest possible levels of safety are met. The bus has been accepted by TUV and has been in scheduled service since 1996. The vehicle has covered a distance of more than 10 000 km in the city of Erlangen without any safety-relevant incident or fault. (author)

  1. Highly Birefringent Photonic Crystal Fibers BUsing Asymmetric Core Design

    Institute of Scientific and Technical Information of China (English)

    Zhao Chun-Liu; Lu Chao; Yan Min; Wang Xiaoyan; Lou Junjun; Li Qin; Zhou Xiaoqun; Cai Qing; P.R.Chaudhuri

    2003-01-01

    We demonstrate a highly birefringent photonic crystal fiber by utilizing the asymmetric core design. Based on spectral measurements of the polarization mode interfering, we estimate that the fiber has a beat length of about 0.33 mm at 1545 nm.

  2. DISEÑO DE SERVICIOS EXPRESOS PARA BUSES

    OpenAIRE

    2013-01-01

    Los servicios expresos, que en general se pueden definir como servicios que atienden a un subconjunto de los paraderos de un determinado corredor, son una estrategia de operación que puede ser beneficiosa tanto para los operadores como para los usuarios. Una reducción en el número de detenciones beneficia a los usuarios al reflejarse en una disminución en los tiempos de viaje. Naturalmente, esto también favorece a los operadores, que al ver reducidos sus tiempos de ciclo pueden...

  3. Testing for drug and alcohol аbuse at the workplace

    Directory of Open Access Journals (Sweden)

    Zoran Kavrakovski

    2009-12-01

    Full Text Available Drug and alcohol abuse in the workplace represents a great risk to employee’s health and safety. More than 50% of the employees worldwide are related to easily accessible drug abuse, while 70% of the employees are related to alcohol abuse in the workplace. Tests for detecting drug and alcohol abuse in the workplace should be part of a new regulation, compulsory for all employees in the Republic of Macedonia. Implementing this sort of testing program should at the same time be a step towards devising particular solutions that shall bring about greater safety in the working environment. A key element in the implementation is to devise and establish an adequate policy that shall determine the risk factors within a working establishment which shall clearly express its position regarding drug and alcohol abuse during working hours. Along with the risk factors, the policy may also include the program for testing both, employees and the ones who are about to be employed, for drug and alcohol abuse. In order to implement this sort of test, it must be in accordance with the Occupational Safety and Health Act (Official gazette of the Republic of Macedonia, No 92/07, 2007 and a legal framework has to be defined, that shall regulate and solve numerous aspects of this issue, in order to fully implement the program for drug free working environment pursuant to the Declaration and the decrees of the United Nations General Assembly in 1998.

  4. Swedish buses global leader in energy efficiency; Svenska bussar vaerldsledande i energieffektivitet

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2012-07-01

    By using hybrid technology and to develop a lighter car body, Volvo has developed one of the world's most energy-efficient bus with support from the Swedish Energy Agency. There is great potential for energy efficiency and emission reductions in the transport sector, especially in the heavy traffic. The transport sector accounts for about 23 percent of total energy use in Sweden and is to 94 percent dependent on fossil fuels.

  5. Urban air quality improvement by using a CNG lean burn engine for city buses

    NARCIS (Netherlands)

    Merétei, T.; Ling, J.A.N. van; Havenith, C.

    1998-01-01

    The use of compressed natural gas (CNG)-fuelled lean-burn city bus engines has a significant potential for air quality improvement in urban areas. Particularly important is the reduction of NO, as well as particulate and non regulated HC-emissions. For this reason, a CNG-fuelled, lean-burn, turbocha

  6. Beyond Buses, Boilers, and Books: Instructional Support Takes Center Stage for Principal Supervisors

    Science.gov (United States)

    Syed, Sarosh

    2014-01-01

    Denver Public Schools, one of 14 districts that receive funding from The Wallace Foundation to improve principal effectiveness, is also one of a number of districts around the country emphasizing the development of principals' managers in the central office. The principal's job has changed over the last decade, going from a role that revolved…

  7. Integrating Field Buses at the Application Level C Interface and LabView Integration

    CERN Document Server

    Charrue, P

    1996-01-01

    The controls group of the SPS and LEP accelerators at CERN, Geneva, uses many different fieldbuses into the controls infrastucture, such as 1553, BITBUS, GPIB, RS232, JBUS, etc. A software package (SL-EQUIP) has been developped to give end users a standardized application program interface (API) to access any equipment connected to any fieldbus. This interface has now been integrated to LabView. We can offer a powerful graphical package, running on HP-UX workstations which treats data from heterogeneous equipment using the great flexibility of LabView. This paper will present SL-EQUIP and LabView, and will then describe some applications using these tools.

  8. Fuel Cell Buses in U.S. Transit Fleets: Current Status 2012

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, Leslie [National Renewable Energy Lab. (NREL), Golden, CO (United States); Chandler, Kevin [Battelle, Columbus, OH (United States); Gikakis, Christina [Federal Transit Administration, Washington, DC (United States)

    2012-11-01

    This report is the sixth in an annual series of reports that summarize the progress of fuel cell electric bus (FCEB) development in the United States and discuss the achievements and challenges of introducing fuel cell propulsion in transit. The report also provides a snapshot of current FCEB performance results over the last year.

  9. Fuel Cell Buses in U.S. Transit Fleets: Current Status 2012

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, L.; Chander, K.; Gikakis, C.

    2012-11-01

    This report is the sixth in an annual series of reports that summarize the progress of fuel cell electric bus (FCEB) development in the United States and discuss the achievements and challenges of introducing fuel cell propulsion in transit. The report also provides a snapshot of current FCEB performance results over the last year. There are 25 active FCEBs in demonstrations this year at eight locations.

  10. DEVELOPMENT OF THE ENERGY MANAGEMENT STRATEGY FOR PARALLEL HYBRID ELECTRIC URBAN BUSES

    Institute of Scientific and Technical Information of China (English)

    HUANG Yuanjun; YIN Chengliang; ZHANG Jianwu

    2008-01-01

    A novel parallel hybrid electrical urban bus (PHEUB) configuration consisting of an extra one-way clutch and an automatic mechanical transmission (AMT) is taken as the study subject. An energy management strategy combining a logic threshold approach and an instantaneous optimization algorithm is proposed for the investigated PHEUB. The objective of the energy management strategy is to achieve acceptable vehicle performance and drivability requirements while simultaneously maximizing the engine fuel consumption and maintaining the battery state of charge in its operation range at all times. Under the environment of Matlab/Simulink, a computer simulation model for the PHEUB is constructed by using the model building method combining theoretical analysis and bench test data. Simulation and experiment results for China Typical Bus Driving Schedule at Urban District (CTBDS_UD) are obtained, and the results indicate that the proposed control strategy not only controls the hybrid system efficiently but also improves the fuel economy significantly.

  11. Forget About Busing--Concentrate on Education; A Response to Raspberry

    Science.gov (United States)

    Raspberry, William; Meyers, Michael

    1974-01-01

    Raspberry argues that there is no persuasive evidence that racial balancing is worth the effort in terms of increased educational opportunity for the children; Meyers asserts that Raspberry's objections are based on several misconceptions about the goals of integrationists. (Author/JM)

  12. Topological quantum buses: coherent quantum information transfer between topological and conventional qubits

    CERN Document Server

    Bonderson, Parsa

    2010-01-01

    We propose computing bus devices that enable quantum information to be coherently transferred between topological and conventional qubits. We describe a concrete realization of such a topological quantum bus acting between a topological qubit in a Majorana wire network and a conventional semiconductor double quantum dot qubit. Specifically, this device measures the joint (fermion) parity of these two different qubits by using the Aharonov-Casher effect in conjunction with an ancilliary superconducting flux qubit that facilitates the measurement. Such a parity measurement, together with the ability to apply Hadamard gates to the two qubits, allows one to produce states in which the topological and conventional qubits are maximally entangled and to teleport quantum states between the topological and conventional quantum systems.

  13. Topological Quantum Buses: Coherent Quantum Information Transfer between Topological and Conventional Qubits

    Science.gov (United States)

    Bonderson, Parsa; Lutchyn, Roman M.

    2011-04-01

    We propose computing bus devices that enable quantum information to be coherently transferred between topological and conventional qubits. We describe a concrete realization of such a topological quantum bus acting between a topological qubit in a Majorana wire network and a conventional semiconductor double quantum dot qubit. Specifically, this device measures the joint (fermion) parity of these two different qubits by using the Aharonov-Casher effect in conjunction with an ancilliary superconducting flux qubit that facilitates the measurement. Such a parity measurement, together with the ability to apply Hadamard gates to the two qubits, allows one to produce states in which the topological and conventional qubits are maximally entangled and to teleport quantum states between the topological and conventional quantum systems.

  14. Willingness to Pay and Public Acceptance for Hydrogen Buses: A Case Study of Perugia

    Directory of Open Access Journals (Sweden)

    Simona Bigerna

    2015-09-01

    Full Text Available Sustainability transportation is characterized by a positive externality on the environment, health, social security, land use and social inclusion. The increasing interest in global warming has caused attention to be paid to the introduction of the hydrogen bus (H2B. When introducing new environmental technologies, such as H2B, it is often necessary to assess the environmental benefits related to this new technology. However, such benefits are typically non-priced due to their public good nature. Therefore, we have to address this problem using the contingent valuation (CV method. This method has been developed within environmental economics as a means to economically assess environmental changes, which are typically not traded in the market. So far, several big cities have been analyzed to evaluate the perceived benefit related to H2B introduction, but to the best of our knowledge, no one has performed a CV analysis of a historical city where smog also damages historical buildings. This paper presents the results obtained using a multi-wave survey. We have investigated user preferences to elicit their willingness to pay for H2B introduction in Perugia, taking into account all types of negative externalities due to the traffic pollution. The results confirm that residents in Perugia are willing to pay extra to support the introduction of H2B.

  15. From "Brown" to Busing. Discussion Paper Series DP 2007-05

    Science.gov (United States)

    Cascio, Elizabeth; Gordon, Nora; Lewis, Ethan; Reber, Sarah

    2007-01-01

    An extensive literature debates the causes and consequences of the desegregation of American schools in the twentieth century. Despite the social importance of desegregation and the magnitude of the literature, we have lacked a comprehensive accounting of the basic facts of school desegregation. This paper uses newly assembled data to document…

  16. Fuel Cell Buses in U.S. Transit Fleets: Current Status 2013

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, L.; Gikakis, C.

    2013-12-01

    This report is the seventh in an annual series of reports that summarize the progress of fuel cell electric bus (FCEB) development in the United States and discuss the achievements and challenges of introducing fuel cell propulsion in transit. The report also provides a snapshot of current FCEB performance results from August 2012 through July 2013 for five FCEB demonstrations at four transit agencies.

  17. Optimal route scheduling-driven study of a photovoltaic charging-station (parking lot) for electric mini-buses

    Science.gov (United States)

    Zacharaki, V.; Papanikolaou, S.; Voulgaraki, Ch; Karantinos, A.; Sioumpouras, D.; Tsiamitros, D.; Stimoniaris, D.; Maropoulos, S.; Stephanedes, Y.

    2016-11-01

    The objective of the present study is threefold: To highlight how electro-mobility can: (a) Contribute to the promotion of the environmental conservation of the rural areas (through an integrated solution for reducing the carbon footprint of road facilities and transport), (b) Enhance tourism-based economical development, (c) facilitate students in their daily transport and residents (elderly, disabled, distant-residents) in their daily on-demand transport. The overall goal is to design an energy-efficient, regional intelligent transportation system with innovative solar-energy charging-stations for e-vehicles in municipalities with many geographically scattered small villages and small cities. The innovative character of the study is that it tries to tackle all three specific objectives simultaneously and with the same means, since it utilizes Intelligent Transportation Systems (ITS). The study is adapted and applied to an area with the above characteristics, in order to demonstrate the proof of concept.

  18. Data Collection, Testing, and Analysis of Hybrid Electric Trucks and Buses Operating in California Fleets. Final Report

    Energy Technology Data Exchange (ETDEWEB)

    Thornton, Matthew [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Duran, Adam [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Ragatz, Adam [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Cosgrove, Jon [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Sindler, Petr [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Russell, Robert [Univ. of California, Riverside, CA (United States); Johnson, Kent [Univ. of California, Riverside, CA (United States)

    2015-06-12

    The objective of this project was to evaluate and quantify the emission impacts of commercially available hybrid medium- and heavy-duty vehicles relative to their non-hybrid counterparts. This effort will allow the California Air Resources Board (CARB) and other agencies to more effectively encourage development and commercial deployment of the most efficient, lowest emitting hybrid technologies needed to meet air quality and climate goals.

  19. From Forced Tolerance to Forced Busing: Wartime Intercultural Education and the Rise of Black Educational Activism in Boston

    Science.gov (United States)

    Burkholder, Zoe

    2010-01-01

    In this article, Zoe Burkholder explores the historical interplay of the emergence of tolerance education in the United States and the rise of black educational activism in Boston. By uncovering a pointed lack of tolerance education in Boston and a widespread promotion of tolerance education in other cities in the early half of the twentieth…

  20. Advising a Bus Company on Number of Needed Buses: How High-School Physics Students' Deal With a "Complex Problem"?

    Science.gov (United States)

    Balukovic, Jasmina; Slisko, Josip; Hadzibegovic, Zalkida

    2011-01-01

    Since 2003, international project PISA evaluates 15-year old students in solving problems that include "decision taking", "analysis and design of systems" and "trouble-shooting". This article presents the results of a pilot research conducted with 215 students from first to fourth grade of a high school in Sarajevo…

  1. Cost Effectiveness Analysis of Quasi-Static Wireless Power Transfer for Plug-In Hybrid Electric Transit Buses: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Wang, Lijuan; Gonder, Jeff; Burton, Evan; Brooker, Aaron; Meintz, Andrew; Konan, Arnaud

    2015-11-11

    This study evaluates the costs and benefits associated with the use of a plug-in hybrid electric bus and determines the cost effectiveness relative to a conventional bus and a hybrid electric bus. A sensitivity sweep analysis was performed over a number of a different battery sizes, charging powers, and charging stations. The net present value was calculated for each vehicle design and provided the basis for the design evaluation. In all cases, given present day economic assumptions, the conventional bus achieved the lowest net present value while the optimal plug-in hybrid electric bus scenario reached lower lifetime costs than the hybrid electric bus. The study also performed parameter sensitivity analysis under low market potential assumptions and high market potential assumptions. The net present value of plug-in hybrid electric bus is close to that of conventional bus.

  2. UJI AKTIVITAS EKSTRAK REBUNG BAMBU TABAH (Gigantochloa nigrociliata BUSE-KURZ TERHADAP PERILAKU KAWIN MENCIT JANTAN (Mus musculus L.

    Directory of Open Access Journals (Sweden)

    A. A. Istri Mas Padmiswari

    2015-11-01

    Full Text Available Penelitan ini bertujuan untuk mengetahui pengaruh ekstrak rebung bambu tabah terhadap perilaku kawin mencit jantan. Rancangan yang digunakan pada penelitian ini adalah rancangan eksperimental sederhana dengan4 kelompok perlakuan dan 6 ulangan, yaitu P0: Kontrol (Perlakuan  dengan pemberian CMC Na 0,5 %, P1: (Perlakuan dengan pemberian ekstrak 200 mg/kg bb, P2: (Perlakuan dengan pemberian ekstrak 300 mg/kg bb dan P3: (Perlakuan dengan pemberian ekstrak 400 mg/kg. Perlakuan ekstrak rebung bambu tabah diberikan pada mencit jantan secara oral setiap hari selama 33 hari dan pengamatan perilaku kawin dilakukan 3 hari sekali. Variabel yang diamati untuk menilai perilaku kawin mencit jantan adalah jumlah mount. Data dianalisa dengan menggunakan uji One Way Annova. Hasil penelitian menunjukkan bahwa pemberian ekstrak rebung bambu tabah berpengaruh signifikan terhadap peningkatan perilaku kawin mencit jantan (P<0,05.

  3. 49 CFR 579.22 - Reporting requirements for manufacturers of 100 or more buses, manufacturers of 500 or more...

    Science.gov (United States)

    2010-10-01

    ... system, air, 05 parking brake, 06 engine and engine cooling system, 07 fuel system, gasoline, 08 fuel... model that is manufactured and available with more than one type of service brake system (i.e., hydraulic or air), the information required by this subsection shall be reported by each of the two...

  4. 基于贝叶斯分类的主题爬虫%Fcoused crawler bused on Bayesian classifier

    Institute of Scientific and Technical Information of China (English)

    贾海军; 陈海光

    2013-01-01

    随着网络的高速发展,其信息资源越来越庞大,面对巨量的信息库,搜索引擎起着重要的作用。主题爬虫技术作为搜索引擎的主要核心部分,计算搜索结果与搜索主题的关系,该关系被称为相关性。一般主题爬虫方法只计算网页内容与搜索主题的相关性,作者所提主题爬虫,通过链接内容和锚文本内容计算链接的重要性,然后利用贝叶斯分类器对链接进行分类,最后利用余弦相似函数计算网页的相关性,如果相关值大于阀值,则认为该网页与预定主题相关,否则不相关。实验结果证明:所提出主题爬虫方法可以获得很高的精确度。%With the rapid development of the network,its information resources are increasingly large and faced a huge amount of information database, search engine plays an important role. Focused crawling technique, as the main core portion of search engine,is used to calculate the relationship between search results and search topics,which is called correlation. Normally,focused crawling method is used only to calculate the correlation between web content and search related topics. In this paper, focused crawling method is used to compute the importance of links through link content and anchor text,then Bayesian classifier is used to classify the links,and finally cosine similarity function is used to calculate the relevance of web pages. If the correlation value is greater than the threshold the page is considered to be associated with the predetermined topics, otherwise not relevant. Experimental results show that a high accuracy can be obtained by using the proposed crawling approach.

  5. Buses, cars, bicycles and walkers: the influence of the type of human transport on the flight responses of waterbirds.

    Directory of Open Access Journals (Sweden)

    Emily M McLeod

    Full Text Available One way to manage disturbance to waterbirds in natural areas where humans require access is to promote the occurrence of stimuli for which birds tolerate closer approaches, and so cause fewer responses. We conducted 730 experimental approaches to 39 species of waterbird, using five stimulus types (single walker, three walkers, bicycle, car and bus selected to mimic different human management options available for a controlled access, Ramsar-listed wetland. Across species, where differences existed (56% of 25 cases, motor vehicles always evoked shorter flight-initiation distances (FID than humans on foot. The influence of stimulus type on FID varied across four species for which enough data were available for complete cross-stimulus analysis. All four varied FID in relation to stimuli, differing in 4 to 7 of 10 possible comparisons. Where differences occurred, the effect size was generally modest, suggesting that managing stimulus type (e.g. by requiring people to use vehicles may have species-specific, modest benefits, at least for the waterbirds we studied. However, different stimulus types have different capacities to reduce the frequency of disturbance (i.e. by carrying more people and vary in their capacity to travel around important habitat.

  6. Variations in the rates of passenger usage of portable Technology on intercity buses, trains and planes: Implications for transportation planning

    OpenAIRE

    Schwieterman, Joseph P.

    2010-01-01

    Over the past several years, the use of portable electronic devices by passengers on intercity transportation services has risen markedly. To support the use of such devices, carriers have installed Wi-Fi systems, power outlets, and cell-phone signal boosters for passenger use. To fill a void in research about the effects of portable electronic technology on intercity travel behavior, this study evaluates newly collected data for 7,028 passengers on bus, train, and air trips. It explores how ...

  7. Itinerant vending of medicines inside buses in Nigeria: vending strategies, dominant themes and medicine-related information provided

    Directory of Open Access Journals (Sweden)

    Yusuff KB

    2011-09-01

    Full Text Available Objectives: To determine if a pharmacist assisted psychiatric clinic would improve adherence to medications and quality of life over 6 months. The primary study endpoints were the change from baseline in Medication Adherence Rating Scale (MARS, Brief Evaluation of Medication Influences and Beliefs (BEMIB, World Health Organization Quality of Life - BREF (WHOQOL-BREF scales as well as hospitalizations and emergency room visits. Secondary endpoints included metabolic and physiologic parameters.Methods: A prospective, single-center study conducted at an outpatient psychiatric clinic. Subjects were required to attend 3 clinic visits (baseline, 3 and 6 months with the pharmacist. Subject and medication histories were obtained at each visit. Subjects’ records within the local health system were reviewed for emergency room visits and hospitalizations. Metabolic parameters were assessed at each visit.Results: Twenty-seven subjects enrolled and twenty subjects completed. Total MARS score at baseline and study end were 7.90 and 8.65, respectively. At baseline, 10 (50% were nonadherent based on the BEMIB and 9 (45% were nonadherent at 6 months. Statistically significant improvements were seen in 2 domains of the WHOQOL-BREF. Reductions in both ER visits and hospitalizations were achieved. There were significant improvements in total cholesterol and LDL.Conclusions: Improvements were seen in two domains of the WHOQOL-BREF – physical capacity and psychological well-being over the 6 month period. While improvements were seen in various rating scales, due to small sample sizes, these were insignificant improvements. Reductions in hospitalizations and ER visits were also seen during the study and up to 6 months post study. Statistically significant improvements were also seen in both total cholesterol and LDL. The lack of improvement in many of the study outcomes reflects the difficulty of the mental health population to adhere to treatment recommendations; but also underscores the need for continued research in this area. This pilot demonstrates the pharmacist’s ability to provide comprehensive medication management services to the psychiatric outpatient.

  8. Brief introduction of breakdowns and fixing methods relating to dual-fuel buses%简述双燃料汽车的故障与排除

    Institute of Scientific and Technical Information of China (English)

    尹殿勇

    2002-01-01

    @@ 汽油-LPG双燃料车在使用中常见的故障及其排除方法如下: (1) 发动机不能起动. 现象之一:打开燃料转换开关工作正常,但气电磁阀不动作、油电磁阀动作.

  9. 26 CFR 48.4221-8 - Tax-free sales of tires, tubes, and tread rubber used on intercity, local, and school buses.

    Science.gov (United States)

    2010-04-01

    ... 26 Internal Revenue 16 2010-04-01 2010-04-01 true Tax-free sales of tires, tubes, and tread rubber... RETAILERS EXCISE TAXES Exemptions, Registration, Etc. § 48.4221-8 Tax-free sales of tires, tubes, and tread... importer of tires of the type used on highway vehicles or inner tubes for tires sold for use by...

  10. 基于人机工程学的公交车拉手设计%Buses Handle Design Based on Ergonomics Analysis

    Institute of Scientific and Technical Information of China (English)

    吕中意; 瞿姚

    2013-01-01

    应用人机工程学原理和人体测量尺寸数据展开对公交车拉手的深入设计.在分析现有产品和设计存在问题的基础上,提出拉手改良设计原理,缓解车辆运行中的惯性带来的眩晕和安全隐患,并充分考虑不同身高人群的使用和广告效益,从手柄、连接结构、广告放置、限位卡及各个部件的材质、色彩等方面,结合手的解剖学特征和立姿静动态尺寸,对拉手进行了改进和完善,为提高该类产品的使用舒适度和改善乘车环境提供新的思路.

  11. 赛特拉·尊荣400喜获公路客车金奖%Setra Zunrong 4000 won gold prize of CIBC for buses

    Institute of Scientific and Technical Information of China (English)

    马丽娟

    2007-01-01

    2007年4月18日在北京展览馆,由建设部科学技术委员会城市车辆专家委员会等权威机构主办的第三届中国国际客车大赛、第二届中国客车节油大赛中,安徽安凯汽车股份有限公司的赛特拉·尊荣400(HFF6121K35)不负众望,“德国品质”再被众多专家认可,荣获中国公路客车金奖。

  12. Quality assurance program guidelines for application to and use by manufacturers of rail/guideway vehicles, buses, automatic train control systems, and their major subsystems

    Science.gov (United States)

    Witkin, S. A.

    1976-01-01

    Guidelines are presented for a quality assurance system to be implemented by the manufacturer in support of designing, developing, fabricating, assembling, inspecting, testing, handling, and delivery of equipment being procured for use in public urban mass transit systems. The guidelines apply to this equipment when being procured for: (1) use in revenue service; (2) demonstration of systems that will be revenue producing or used by the public; (3) use as a prototype for follow-on operational/revenue producing equipment procurements; and (4) qualification tests.

  13. 康明斯国Ⅳ发动机装配杭州混合动力公交车%Another 50 Hybrid-drive Xiamen Golden Dragon Public Buses are on Road in Hangzhou

    Institute of Scientific and Technical Information of China (English)

    王作函

    2009-01-01

    @@ 2009年9月9日,正在浙江进行友好访问的美国印第安纳州州长MitehDaniels-行专程出席了杭州公交装备康明斯国Ⅳ发动机的混合动力车揭幕仪式.Daniels州长与浙江省外事办公室副主任彭波、杭州公交技术部主管李超,以及康明斯集团副总裁曹思德(Steve Chapman)一起,为采用油-电混合动力技术的12 m低入口金旅混合动力公交车揭下了象征喜庆祥和的"红盖头".

  14. 即插即用式多总线电动执行器控制系统%Plug-and-play control system compatible with different field-buses for electric actuator

    Institute of Scientific and Technical Information of China (English)

    夏继强; 孙宇; 邢春香; 满庆丰

    2011-01-01

    采用模块化设计思想,将DeviceNet、Profibus-DP以及HART现场总线技术应用于电动执行器控制系统.总线通信电路从主控制板上分离,集成于总线通信卡,通过统一的物理接口与主控制板相连,完成与微控制单元(MCU)的数据交换,实现多总线系统的兼容,并通过总线类型自适应方式实现了即插即用,降低了用户的使用难度.电动执行器可通过组态接入控制网络.%Based on the modular design concept,the field-bus technologies of DeviceNet,Profibus-DP and HART are applied to the control system of electric actuator. The field-bus communication circuit,separated from the main control board,is integrated in field-bus communication card,which is connected to the main control board through a unified physical interface for data exchange. The field-bus type adaption is applied to realize plug-and-play. The electric actuator is connected to the control network by configuration.

  15. 大客车第三代超导无声自动灭火装置%The third generation superconductive noiseless automatic fire extinguishing system installed in motor buses

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    据悉,武汉绿色消防器材有限公司成功研发出大客车第三代超导无声自动灭火装置。该产品与传统车用灭火器相比,具有启动速度快、灭火效率高、无噪音、使用后对被保护车辆无损毁等优点。

  16. 部分AdBlue加注站停用:北京国Ⅳ公交加注尿素需靠人工%Some AdBlue Refill Stations for Public Buses Are Suspended

    Institute of Scientific and Technical Information of China (English)

    韩梦华

    2010-01-01

    @@ 随着北京八方达公司的亚星YBL6985和京华BK6980B1型城市客车的"退休",以及新车型陆续上路,北京公交基本告别了国Ⅱ公交时代,而代替它们的将是符合国Ⅲ甚至国Ⅳ排放标准的新型城市客车.

  17. Inter-organizational learning for sustained competitiveness and ecological sustainability – the case of beta-testing activities of alternative-fuel, fuel cell-driven public transport buses

    NARCIS (Netherlands)

    I.L.R. Struyf

    2003-01-01

    textabstractThis doctoral research paper focuses on the occurrence and functioning of groups of organizations, which need to collaborate on inter-related innovations for sustainable development (SD) and ecological sustainability (ES). First of all, approaches to corporate environmental management (E

  18. Design of a particle filter system with exhaust gas full stream regeneration for diesel engine and testing in municipal buses and forklifts. Final report. Entwicklung eines Partikelfiltersystems mit Abgasvollstromregeneration fuer Dieselmotoren und Erprobung im Stadtbus- und Gabelstaplereinsatz. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Berendes, H.; Houben, H.; Knuth, W.

    1993-04-01

    The research project described above has the following targets: Design of system components and proof of functionality of the whole system on the test bench; safte of function tests by field testing in a municipal bus as a basis for service vehicle utilisation and in a forklift truck for industrial use and tractors. (HW)

  19. Determination of vitamin B1 and B2 in compound vitamin Busing multiple lincar regression spectrophotometry%多元线性分光光度法测定复合维生素B片

    Institute of Scientific and Technical Information of China (English)

    杨敏; 刘惠军

    2001-01-01

    目的:建立复合维生素B片中维生素B1、维生素B2的含量测定方法。方法:采用多波长多元线性回归分光光度法,维生素B1的测定波长为245nm、248nm和251nm,维生素B2的测定波长为258nm、261nm和264nm,溶剂为盐酸液(9→1000)。结果:标准曲线在4.0μg/ml20.0μg/ml范围内呈良好线性关系。平均回收率维生素B1为99.8%,RSD小于2.21%;维生素B2为98.7%,RSD小于1.98%。结论:该法可准确测定复合维生素B中两组分的含量。%objective: To establish the determination of vitamins B1 and B2in compound vitamin B. Methods: The multiple linear regression spectrophotometry was used with wavelength of 245nm, 248nm, 251nm and 258nm, 261nm and 264nm. The solvent was HCL. Results: The calibration curve was linear between 4.0μg/ml to 20.0mg/ml. The relative standard deviations vitamins B1 and B2 were less than 1.1% and 0.7% at the three different concentrations. Their recovery rates was 101.4% and 99.4%. Conclusion: This method is accurate for the determination of vitamins B1 and B2 in the compound vitamin B.

  20. Propane Basics

    Energy Technology Data Exchange (ETDEWEB)

    NREL

    2010-03-01

    Propane powers about 190,000 vehicles in the U.S. and more than 14 million worldwide. Propane vehicles are a good choice for many fleet applications including school buses, shuttle buses, taxies and light-duty trucks.

  1. 75 FR 54002 - Notice of Receipt of Petition for Decision That Nonconforming 1987-1988 Leyland Motors Olympian...

    Science.gov (United States)

    2010-09-02

    ... Nonconforming 1987-1988 Leyland Motors Olympian Open Top Model Double Decker Buses Are Eligible for Importation... a petition for a decision that 1987-1988 Leyland Motors Olympian open top model double decker buses... nonconforming 1987-1988 Leyland Motors Olympian open top model double decker buses are eligible for...

  2. It's Time to Move for School Bus

    Institute of Scientific and Technical Information of China (English)

    Amy Hu

    2011-01-01

    @@ The 1st China School Buses Development Seminar &.International School Buses Expo will be held from February 15 to 18, 2012 in the National Convention Center in Beijing, according to the National Office of Education on the Traffic Safety of Primary and Secondary School Students.It aims to publicize the Chinese standards for school bus safety, improve the development, production and operation of school buses in China and the rest of the world, promote the application new technologies on school buses, and call on people to care about and support the development of school buses.

  3. Bus Timetabling as a Fuzzy Multiobjective Optimization Problem Using Preference-based Genetic Algorithm

    Directory of Open Access Journals (Sweden)

    Surafel Luleseged Tilahun

    2012-05-01

    Full Text Available Transportation plays a vital role in the development of a country and the car is the most commonly used means. However, in third world countries long waiting time for public buses is a common problem, especially when people need to switch buses. The problem becomes critical when one considers buses joining different villages and cities. Theoretically this problem can be solved by assigning more buses on the route, which is not possible due to economical problem. Another option is to schedule the buses so that customers who want to switch buses at junction cities need not have to wait long. This paper discusses how to model single frequency routes bus timetabling as a fuzzy multiobjective optimization problem and how to solve it using preference-based genetic algorithm by assigning appropriate fuzzy preference to the need of the customers. The idea will be elaborated with an example.

  4. A comparison of emissions from vehicles fueled with diesel or compressed natural gas.

    Science.gov (United States)

    Hesterberg, Thomas W; Lapin, Charles A; Bunn, William B

    2008-09-01

    A comprehensive comparison of emissions from vehicles fueled with diesel or compressed natural gas (CNG) was developed from 25 reports on transit buses, school buses, refuse trucks, and passenger cars. Emissions for most compounds were highest for untreated exhaust emissions and lowest for treated exhaust CNG buses without after-treatment had the highest emissions of carbon monoxide, hydrocarbons, nonmethane hydrocarbons (NMHC), volatile organic compounds (VOCs; e.g., benzene, butadiene, ethylene, etc.), and carbonyl compounds (e.g., formaldehyde, acetaldehyde, acrolein). Diesel buses without after-treatment had the highest emissions of particulate matter and polycyclic aromatic hydrocarbons (PAHs). Exhaust after-treatments reduced most emissions to similar levels in diesel and CNG buses. Nitrogen oxides (NO(x)) and carbon dioxide (CO2) emissions were similar for most vehicle types, fuels, and exhaust after-treatments with some exceptions. Diesel school buses had higher CO2 emissions than the CNG bus. CNG transit buses and passenger cars equipped with three-way catalysts had lower NO(x) emissions. Diesel buses equipped with traps had higher nitrogen dioxide emissions. Fuel economy was best in the diesel buses not equipped with exhaust after-treatment.

  5. 75 FR 76692 - Federal Motor Vehicle Safety Standards; Small Business Impacts of Motor Vehicle Safety

    Science.gov (United States)

    2010-12-09

    ..., and 571 Federal Motor Vehicle Safety Standards; Small Business Impacts of Motor Vehicle Safety AGENCY... passenger vehicles, trucks, buses, trailers, incomplete vehicles, motorcycles, and motor vehicle...

  6. Zero Emission Bay Area (ZEBA) Fuel Cell Bus Demonstration Results: Fifth Report

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, Leslie [National Renewable Energy Lab. (NREL), Golden, CO (United States); Post, Matthew [National Renewable Energy Lab. (NREL), Golden, CO (United States); Jeffers, Matthew [National Renewable Energy Lab. (NREL), Golden, CO (United States)

    2016-06-01

    This report presents results of a demonstration of fuel cell electric buses (FCEB) operating in Oakland, California. Alameda-Contra Costa Transit District (AC Transit) leads the Zero Emission Bay Area (ZEBA) demonstration, which includes 13 advanced-design fuel cell buses and two hydrogen fueling stations. The ZEBA partners are collaborating with the U.S. Department of Energy (DOE) and DOE's National Renewable Energy Laboratory (NREL) to evaluate the buses in revenue service. NREL has published four previous reports describing operation of these buses. This report presents new and updated results covering data from January 2015 through December 2015.

  7. Zero Emission Bay Area (ZEBA) Fuel Cell Bus Demonstration Results. Fourth Report

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, Leslie [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Post, Matthew [National Renewable Energy Laboratory (NREL), Golden, CO (United States)

    2015-07-02

    This report presents results of a demonstration of fuel cell electric buses (FCEB) operating in Oakland, California. Alameda-Contra Costa Transit District (AC Transit) leads the Zero Emission Bay Area (ZEBA) demonstration, which includes 12 advanced-design fuel cell buses and two hydrogen fueling stations. The FCEBs in service at AC Transit are 40-foot, low-floor buses built by Van Hool with a hybrid electric propulsion system that includes a US Hybrid fuel cell power system and EnerDel lithium-based energy storage system. The buses began revenue service in May 2010.

  8. China Bus Conquers EU-Report of Malta Bus Project Delivery Ceremony in which 172 GOLDEN DRAGON Buses Are Exported%中国客车力征欧盟——记172辆大金龙公交车出口马耳他仪式

    Institute of Scientific and Technical Information of China (English)

    陈乐

    2011-01-01

    @@ 挺进马耳他 172辆金龙客车力征欧盟市场 4月2日上午,厦门现代码头,172辆大金龙公交客车整齐排列,形成一个壮观的方阵等待装船出海,"中国客车力征欧盟--马耳他公交项目172辆金龙客车出口交车仪式"在这里举行,当ARRIVA马耳他公司总经理Keith Bastow从金龙汽车集团副总经理、大金龙董事谢思瑜手中接过金钥匙,中国客车出口历史在这一刻改写,马耳他交通部长奥斯汀·盖特先生亲临现场见证这一重要时刻,迎接172辆客车回国.

  9. Green Quality Casts Praise, Gold Services Wins Trust——Xiamen GOLDEN DRAGON Obtains Bulk Orders of 105 Hybrid Buses in Hangzhou%绿色品质铸口碑,金牌服务赢信赖——厦门金旅获得杭州混和动力105台批量订单

    Institute of Scientific and Technical Information of China (English)

    芷风

    2010-01-01

    @@ 多元化的城市交通虽然从一定程度缓解了交通拥堵的问题,但却引发了新一轮环境保护的思考.公交客车作为杭州市民出行的主要工具,出行频率之高,其尾气污染物的排放给环境带来了巨大压力,面对如此形势,近年来,杭州公共交通集团(以下简称杭州公交)在国家、省、市政府多项政策的号召下,以环保先行全方位实施新能源策略,携手杭州各界共同打造"生活品质城市".

  10. 幸福的城市,幸运的金旅——厦门金旅75辆考斯特城市客车批量投入深圳运营%Lucky city, luck Golden Dragon: XMJL 75 Coaster buses commissioned in Shenzhen

    Institute of Scientific and Technical Information of China (English)

    肖华

    2010-01-01

    @@ 6月,厦门金旅75台考斯特城市客车分批陆续下线发往广东深圳.该批车辆为深圳东部公共交通有限公司(以下简称"深圳东部公交")所订购,已于6月中下旬投入深圳龙岗区与坪山新区支线巴士线路运营. 深圳东部公交是政府实行公交专营的改革成果,其于2007年9月正式成立,主要负责深圳龙岗区与坪山新区的交通服务.

  11. 高精度刚架梁式SK-1应变计参数测定装置的结构和精度评定%Structure and Accuracy of SK- 1 High Accurate Strain Gauge Parameters Testing Apparatus Bused on a Rigid Framed Beam

    Institute of Scientific and Technical Information of China (English)

    邓足斌; 张振洲

    2001-01-01

    The SK- i strain gauge parameters testing apparatus presented in this paper is based on the rigid frame bean principle. It is different from those commonly used internationally based on simply spported beams of pure bending moments or cantilever beams of equal strength. According to the two newly proposed concepts, i. e., the shape error of the cylindric surface of the calibration beam and the measurement error of the calibration beam deflection, this paper carries out the error analysis and accuracy evaluation of the apparatus to illustriate the justification of its choice of scheme, and design of structure. It is proven that the SK -1 apparatus is a high accuracy standard apparatus for the implementation of interna- tional Recommendation No. 62 of OIML“The Performance aracteristics of Metallic Resistance Strain Gauges”, and Chi- nese National Standards of Resistance Strain Gauges, GB/T 13992 - 92. Its relative expanded uncertainty has been achieved Ur = 0.11%.%文中提出的SK-1刚架梁式应变计参数测定装置,同目前国际上一般采用简支纯弯矩梁和等强度悬臂梁原理制成的这类装置不一样,沈阳仪器仪表工艺研究所是采用刚架梁原理研制而成的,并按新提出的标定梁园柱面形状误差和标定梁挠度误差两概念[3],对其进行误差分析和不确定度评定。从而说明该装置的方案,设计思路和精度检定的合理性。为我国电阻应变计(GB/T 13992-92)国家标准和国际电阻应变计行业贯彻实施[OIML]国际建议62号“金属电阻应变计工作特性”提供一种高精度应变计参数的标准装置。它的相对展伸不确定度已达0.1%。

  12. 基于RS-485、1-Wire总线的远程多点温度采集系统解决方案%The solution to remote multipoint temperature data collecting system based on the RS-485 and 1-Wire buses

    Institute of Scientific and Technical Information of China (English)

    段波

    2010-01-01

    介绍了采用RS-485、1-Wire总线技术实现远程多点温度采集系统的解决方案,讨论了基于1-wire的DS18B20数字温度传感器、基于RS-485的MAX13082E收发器在远程多点温度采集实现过程中的使用方法以及关键技术.

  13. A Hybrid Column Generation and Clustering Approach to the School Bus Routing Problem with Time WindowsUn Aproximación Híbrida de Generación de Columnas y Agrupación para Resolver el Problema de Ruteo de Buses Escolares con Ventanas deTiempo

    Directory of Open Access Journals (Sweden)

    Eduyn Ramiro Lopez Santana

    2015-03-01

    Full Text Available This paper attempts to solve the School Bus Routing Problem with Time Windows that consists of finding the best set of routes to pick up students distributed geographically with constraints as capacity, time windows and maximum travel time. We formulated the problem as a classic Vehicle Routing Problem with Time Windows and solved it using an approach based on a clustering algorithm and column generation method. A real world case from a school in Bogotá, Colombiais presented including 600 students to pick up in near 400 nodes located in urban and rural areas. The obtained results demonstrate a reduction as the problem’s complexity and  an improvement on the performance measures of the proposed method.

  14. Avaliação dos fatores de risco laborais e físicos para doenças cardiovasculares em motoristas de transporte urbano de ônibus em Montes Claros (MG Evaluation of labor-related and physical risk factors for cardiovascular disease in drivers of urban transport buses in Montes Claros in the state of Minas Gerais

    Directory of Open Access Journals (Sweden)

    Andréia Farias Alquimim

    2012-08-01

    Full Text Available Este estudo buscou avaliar os fatores de risco para doenças cardiovasculares em motoristas de ônibus em Montes Claros (MG. Foi empregado um questionário semiestruturado abordando dados pessoais, antropométricos, profissionais e laborais; e outro referente ao grau de estresse. Foram pesquisados 53 motoristas de ônibus e a média de idade foi de 30 a 39 anos, e dessa população, 81,1% diziam não ser fumantes, 58% não consumiam bebida alcoólica e 50% praticavam algum tipo de exercício. Na avaliação do IMC 40 motoristas (75,4% estavam com excesso de peso. A prevalência dos hábitos alimentares foi de excesso consumo de açúcar (66,0%, de gordura (64,2%, de café (69,8%, de sal (60,4%, de Coca Cola (64,2% e de refrigerante (54,7%. Dentre os relatos de doenças crônicas não foram observados motoristas diabéticos (98,1% e nem hipertensos (94,3%. A maioria da amostragem, 69,7% teve nível de estresse normal. Em relação aos dados laboratoriais, a grande maioria dos motoristas apresentou hipertrigliceridemia e hipercolesterolemia. Os níveis de HDL estavam satisfatórios, e o de LDL apresentou nível normal e desejável em mais da metade da amostra. A prevalência para doença cardiovascular mostrou-se baixa.The scope of this study was to evaluate risk factors for cardiovascular disease among bus drivers in Montes Claros in the state of Minas Gerais. A semi-structured questionnaire covering personal, anthropometric, professional and labor-related data was used, in addition to a questionnaire on the level of stress. 53 bus drivers were surveyed and the average age was 30 to 39 years of age. 81.1% were non-smokers; 58% of the sample were teetotalers; and 50% took regular exercise. In the assessment of BMI, 40 drivers (75.4% were overweight. The prevalence in eating habits revealed excess consumption of sugar (66.0%, fat (64.2%, coffee (69.8%, salt (60.4%, coca cola (64.2% and soft drinks (54.7%. Among reports of chronic diseases, no diabetic (98.1% or hypertensive (94.3% drivers were observed. Most of the sample (69.7% had normal stress levels. With respect to laboratory data, the vast majority of drivers had hypertriglyceridemia and hypercholesterolemia. HDL levels were satisfactory, and the LDL revealed normal and desirable levels in more than half of the sample. The prevalence of cardiovascular disease was low.

  15. How to Cut Costs by Saving School Bus Fuel.

    Science.gov (United States)

    Seiff, Hank

    A program started in Washington County, Maryland in 1980 has been successful in saving school bus fuel and bringing down transportation costs incurred by its fleet of 200 buses. Driver training and motivation, as well as a partial transfer to diesel buses, are at the heart of the program. The drivers are taught five fuel saving techniques: cut…

  16. 76 FR 37175 - FY 2011 Discretionary Sustainability Funding Opportunity Transit Investments for Greenhouse Gas...

    Science.gov (United States)

    2011-06-24

    ... sectors that reduce energy bills. FTA advances these energy and environmental goals by funding projects...) Purchasing or leasing clean fuel buses, including buses that employ a lightweight composite primary structure... project; (2) Constructing or leasing clean fuel bus facilities or electrical recharging facilities...

  17. Phileas simulatoronderzoek: gedrag en evaluatie chauffeurs

    NARCIS (Netherlands)

    De Waard, D.; Brookhuis, K.A.; van Wolffelaar, P.C

    2003-01-01

    Phileas is a new, high quality public transport vehicle combining characteristics of bus, tram, and the underground. Phileas is equipped with pneumatic tyres and complies with the statutory regulations for buses. Accordingly Phileas may drive everywhere on public roads where buses are allowed to dri

  18. Driving the Phileas, a new automated public transport vehicle

    NARCIS (Netherlands)

    de Waard, Dick; Brookhuis, Karel; Fabriek, Eva; Van Wolffelaar, Peter C.

    2004-01-01

    Phileas is a high quality public transport vehicle combining characteristics of bus, tram, and the underground. Phileas is equipped with pneumatic tyres and complies with the statutory regulations for buses. Accordingly Phileas may drive everywhere on public roads where buses are allowed to drive. O

  19. Identification of some Malaysian grasses

    NARCIS (Netherlands)

    Henrard, J.Th.

    1935-01-01

    When BUSE gave an enumeration of the grasses collected by JUNGHUHN in Java and Sumatra, he mentioned under Paspalum a species, described by RETZIUS in the year 1781 as Paspalum hirsutum. BUSE identified a grass from Sumatra as being the species of RETZIUS, on account of the description, having certa

  20. Name changes in Agrostis, Arundinella, Deyeuxia, Helictotrichon, Tripogon (Gramineae)

    NARCIS (Netherlands)

    Veldkamp, J.F.

    1996-01-01

    Buse’s (1854) treatment of Junghuhn’s Gramineae appeared before more parts of Steudel’s Synopsis (1853-1855) than was previously thought. Agrostis rigidula Steud. becomes. A. infirma Buse with 8 new varietal combinations. Arundinella fuscata Nees ex Buse previously regarded as a later homonym is inv

  1. Microprocessor systems for industrial process control

    Science.gov (United States)

    Lesh, F. H.

    1980-01-01

    Six computers operate synchronously and are interconnected by three independent data buses. Processors control one subsystem. Some can control buses to transfer data at 1 megabit per second. Every 2.5 msec each processor examines list of things to do during next interval. This spacecraft control system could be adapted for controlling complex industrial processes.

  2. Risks at bus fires. Recommendations for the improvement of the safety; Gefahren bei Busbraenden. Empfehlungen zur Verbesserung der Sicherheit

    Energy Technology Data Exchange (ETDEWEB)

    Hofmann-Boellinghaus, Anja; Duelsen, Steffen [Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin (Germany)

    2012-09-15

    The heavy bus fire in 2008 near Hanover, in which 20 of the 32 passengers left their life, has shown that the current fire protections regulations for buses cannot guarantee the self rescue of the passengers. The Federal Highway Research Institute (Bergisch Gladbach, Federal Republic of Germany) sponsored a research project in order to study the current fire protection regulations and developed recommendations to improve the fire safety in buses. Numerous attempts at materials present in buses were performed and compared with the requirements for rail vehicles. Accompanying the experimental investigations fire progressions were calculated in order to identify particularly dangerous scenarios and explore possible measures.

  3. Bed Bugs FAQs

    Science.gov (United States)

    ... Bed bugs have been found in five-star hotels and resorts and their presence is not determined ... sleep. These areas include apartments, shelters, rooming houses, hotels, cruise ships, buses, trains, and dorm rooms. They ...

  4. Roadmap and technical white papers for the 21st century truck partnership

    Energy Technology Data Exchange (ETDEWEB)

    None, None

    2006-12-01

    21st Century Truck Partnership will support the development and implementation of technologies that will cut fuel use and emissions and enhance safety, affordability, and performance of trucks and buses.

  5. 22 CFR 228.13 - Special source rules requiring procurement from the United States.

    Science.gov (United States)

    2010-04-01

    ... must be procured in the United States if the domestic price is less than parity, unless the commodity... buses, motorcycles, scooters, motorized bicycles and utility vehicles. Excluded from this definition...

  6. China's Factories Aim to Fill the World's Garages

    Institute of Scientific and Technical Information of China (English)

    KeithBradsher; 王孝杰; 吴文忠

    2004-01-01

    China, long a nation of pedestrians, cyclists and buses, is undergoing an automobile revolution. Sales of cars, pickup trucks and sport utility vehicles here overtook similar sales in Germany this year, and production surpassed South Korea's.

  7. 75 FR 54543 - Americans With Disabilities Act (ADA) Accessibility Guidelines for Transportation Vehicles

    Science.gov (United States)

    2010-09-08

    ... buses, and vans. 75 FR 43748 (July 26, 2010). The comment period on the proposed rule ends on November... the public hearings are requested to refrain from using perfume, cologne, and other fragrances. To...

  8. Trace Atmospheric Gas Analyzer (TAGA) Volatile Organic Compound (VOC) Data for BP Spill/Deepwater Horizon - May 2010

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Trace Atmospheric Gas Analyzer (TAGA) buses are self-contained mobile laboratories that conduct instant-result monitoring of air quality at particular locations....

  9. Trace Atmospheric Gas Analyzer (TAGA) Volatile Organic Compound (VOC) Data for BP Spill/Deepwater Horizon - August 2010

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Trace Atmospheric Gas Analyzer (TAGA) buses are self-contained mobile laboratories that conduct instant-result monitoring of air quality at particular locations....

  10. Injection molded optical backplane for broadcast architecture

    Science.gov (United States)

    Rosenberg, Paul; Mathai, Sagi; Sorin, Wayne V.; McLaren, Moray; Straznicky, Joseph; Panotopoulos, Georgios; Warren, David; Morris, Terry; Tan, Michael R. T.

    2012-01-01

    A low cost, blind mate, injection molded optical backplane is presented. The optical backplane is comprised of 12 channel optical broadcast buses, operating at 10Gbps/channel with six blindmate optical output ports spaced 1U apart.

  11. Trace Atmospheric Gas Analyzer (TAGA) Volatile Organic Compound (VOC) Data for BP Spill/Deepwater Horizon - July 2010

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Trace Atmospheric Gas Analyzer (TAGA) buses are self-contained mobile laboratories that conduct instant-result monitoring of air quality at particular locations....

  12. School Districts Move to the Head of the Class with Propane

    Energy Technology Data Exchange (ETDEWEB)

    2016-01-01

    Propane has been a proven fuel for buses for decades. For the first time in 2007, Blue Bird rolled out a propane school bus using direct liquid injection, which was later followed by Thomas Built Buses and Navistar. Because this new technology is much more reliable than previous designs, it is essentially reintroducing propane buses to many school districts. During this same time period, vehicle emissions standards have tightened. To meet them, diesel engine manufacturers have added diesel particulate filters (DPF) and, more recently, selective catalytic reduction (SCR) systems. As an alternative to diesel buses with these systems, many school districts have looked to other affordable, clean alternatives, and they've found that propane fits the bill.

  13. The introduction of gas-powered busses in Berne; Die Einfuehrung von Gasbussen bei Bernmobil - Ein Erfahrungsbericht

    Energy Technology Data Exchange (ETDEWEB)

    Finger, D.; Kljun, N.; Keller, M.

    2008-07-01

    This report for the Swiss Federal Office of Energy (SFOE) discusses the experience gained from the operation of biogas-powered buses in Berne, Switzerland. The fleet conversion from diesel-engined buses to new vehicles powered by biogas from the city's wastewater treatment plant is discussed. Six operational aspects involved in the use of gas-powered buses in comparison with traditional diesel buses are examined and discussed. These include infrastructure adaptations, fuel and energy consumption, emissions and air-hygiene, operational changes, financial aspects and acceptance of the new vehicles both by operating personnel and the general public. Operational difficulties encountered after fire-damage to the gas filling equipment in the bus depot are noted. Fuel consumption is commented on and measurements made on emissions are discussed. The advantages and disadvantages of biogas busses in comparison with diesel busses are discussed.

  14. 77 FR 52128 - Intent To Prepare an Environmental Impact Statement and Environmental Assessment for the I-20...

    Science.gov (United States)

    2012-08-28

    ... primarily of local and express buses operating in normal traffic, and which provides limited transportation... and Gresham Road, then serve stations at Glenwood Avenue, Moreland Avenue, and Bill Kennedy...

  15. Technical and systems evaluations

    Energy Technology Data Exchange (ETDEWEB)

    Skolnik, E.G.; DiPietro, J.P. [Energetics, Inc., Washington, DC (United States)

    1998-08-01

    During FY 1998 Energetics performed a variety of technology-based evaluations for the Hydrogen Program. Three evaluations are summarized below: hydrogen bromine-based electricity storage, carbon-based hydrogen storage, and hydrogen-fueled buses.

  16. 76 FR 31336 - Proposed Data Collections Submitted for Public Comment and Recommendations

    Science.gov (United States)

    2011-05-31

    ... poverty, poor access to preventive medical services, and homophobia, which causes some men who have sex... public buses with video monitors, on video kiosks, and on Web sites. There is no cost to...

  17. Trace Atmospheric Gas Analyzer (TAGA) Dispersant Data for BP Spil/Deepwater Horizon - August 2010

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Trace Atmospheric Gas Analyzer (TAGA) buses are self-contained mobile laboratories that conduct instant-result monitoring of air quality at particular locations....

  18. Trace Atmospheric Gas Analyzer (TAGA) Volatile Organic Compound (VOC) Data for BP Spill/Deepwater Horizon - June 2010

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Trace Atmospheric Gas Analyzer (TAGA) buses are self-contained mobile laboratories that conduct instant-result monitoring of air quality at particular locations....

  19. The reliable multicast protocol application programming interface

    Science.gov (United States)

    Montgomery , Todd; Whetten, Brian

    1995-01-01

    The Application Programming Interface for the Berkeley/WVU implementation of the Reliable Multicast Protocol is described. This transport layer protocol is implemented as a user library that applications and software buses link against.

  20. A Comparison of Bus Architectures for Safety-Critical Embedded Systems

    Science.gov (United States)

    Rushby, John; Miner, Paul S. (Technical Monitor)

    2003-01-01

    We describe and compare the architectures of four fault-tolerant, safety-critical buses with a view to deducing principles common to all of them, the main differences in their design choices, and the tradeoffs made. Two of the buses come from an avionics heritage, and two from automobiles, though all four strive for similar levels of reliability and assurance. The avionics buses considered are the Honeywell SAFEbus (the backplane data bus used in the Boeing 777 Airplane Information Management System) and the NASA SPIDER (an architecture being developed as a demonstrator for certification under the new DO-254 guidelines); the automobile buses considered are the TTTech Time-Triggered Architecture (TTA), recently adopted by Audi for automobile applications, and by Honeywell for avionics and aircraft control functions, and FlexRay, which is being developed by a consortium of BMW, DaimlerChrysler, Motorola, and Philips.

  1. Motor Carrier Crash Data -

    Data.gov (United States)

    Department of Transportation — Contains data on large trucks and buses involved in Federally reportable crashes as per Title 49 U.S.C. Part 390.5 (crashes involving a commercial motor vehicle, and...

  2. OSU TOMF Program Site Selection and Preliminary Concept Design Report

    Energy Technology Data Exchange (ETDEWEB)

    Spadling, Steve [Oklahoma State Univ., Stillwater, OK (United States)

    2012-05-10

    The purpose of this report is to confirm the programmatic requirements for the new facilities, identify the most appropriate project site, and develop preliminary site and building concepts that successfully address the overall project goals and site issues. These new facilities will be designed to accommodate the staff, drivers and maintenance requirements for the future mixed fleet of passenger vehicles, Transit Style Buses and School Buses.

  3. BC Transit Fuel Cell Bus Project: Evaluation Results Report

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, L.; Post, M.

    2014-02-01

    This report evaluates a fuel cell electric bus demonstration led by British Columbia Transit (BC Transit) in Whistler, Canada. BC Transit is collaborating with the California Air Resources Board and the U.S. Department of Energy's National Renewable Energy Laboratory to evaluate the buses in revenue service. This evaluation report covers two years of revenue service data on the buses from April 2011 through March 2013.

  4. RIDING IN STYLE

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Beijing is upgrading its bus fleet to make commuting more comfortable and environmentally friendly As part of the Beijing Municipal Government's efforts to promote public transportation, the city is upgrading its fleet of buses to provide the latest in comfort and to meet more stringent pollution emission standards. People may remember a line from the American sitcom Friends describing Beijing buses in 1996 as "easily 200 years old...200 at least." If the cast of the television show paid a visit to China...

  5. Pipelined asynchronous time-division multiplexing optical bus

    Science.gov (United States)

    Zheng, S. Q.; Li, Yueming

    1997-12-01

    We propose a pipelined asynchronous time-division multiplexing optical bus. Such a bus can use one of two hardwared priority schemes: the linear priority scheme and the round-robin priority scheme. Our simulation results show that the performance of the proposed bus is significantly better than the performances of known pipelined synchronous time-division multiplexing optical buses. The possibilities of using our buses to construct multichannel switches and multidimensional processor arrays are also discussed.

  6. Theoretical Modeling and Simulation of Phase-Locked Loop (PLL) for Clock Data Recovery (CDR)

    OpenAIRE

    Zainab Mohamad Ashari; Anis Nurashikin Nordin

    2012-01-01

    Modern communication and computer systems require rapid (Gbps), efficient  and large bandwidth data transfers. Agressive scaling of digital integrated systems  allow buses and communication controller circuits to be integrated with the microprocessor on the same chip. The  Peripheral Component Interconnect Express (PCIe) protocol handles all communcation between the central processing unit (CPU) and hardware devices. PCIe buses require efficient clock data recovery circuits (CD...

  7. School Districts Move to the Head of the Class with Propane

    Energy Technology Data Exchange (ETDEWEB)

    None

    2016-01-12

    School districts across the country are under pressure to reduce their cost of operations and ensure their budgets are spent wisely. School bus fleets operate more than 675,000 buses in the United States, and many school districts have found the answer to their budget woes in the form of propane, or liquefied petroleum gas (LPG). Propane is a reliable, domestic fuel, and it's used in approximately 2% of school buses nationwide.

  8. National Fuel Cell Bus Program: Accelerated Testing Evaluation Report #2, Alameda-Contra Costa Transit District (AC Transit) and Appendices

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, L.; Chandler, K.

    2010-06-01

    This is an evaluation of hydrogen fuel cell transit buses operating at AC Transit in revenue service since March 20, 2006, comparing similar diesel buses operating from the same depot. It covers November 2007 through February 2010. Results include implementation experience, fueling station operation, evaluation results at AC Transit (bus usage, availability, fuel economy, maintenance costs, and road calls), and a summary of achievements and challenges encountered during the demonstration.

  9. USSR Report, Electronics and Electrical Engineering, No. 111

    Science.gov (United States)

    2007-11-02

    Cinematography , and BONDARCHUK, 7. M,, IRZ, P. 7., GILINSKIY, A. G. and DROZDOV, 7. M., "Ekran" Scientific and Production Organization iAbstract] Major...dimensions and currents in the buses. The shielding factor representing the primary electromagnetic parameter acting on the bus of a given lead is...practically independent of the pattern of current change in the bus with time. The actual electrodynamic forces acting on the buses were calculated by a

  10. National Fuel Cell Bus Program: Accelerated Testing Evaluation Report and Appendices, Alameda-Contra Costa Transit District (AC Transit)

    Energy Technology Data Exchange (ETDEWEB)

    Chandler, K.; Eudy, L.

    2009-01-01

    This is an evaluation of hydrogen fuel cell transit buses operating at AC Transit in revenue service since March 20, 2006 compared to similar diesel buses operating from the same depot. This evaluation report includes results from November 2007 through October 2008. Evaluation results include implementation experience, fueling station operation, fuel cell bus operations at Golden Gate Transit, and evaluation results at AC Transit (bus usage, availability, fuel economy, maintenance costs, and roadcalls).

  11. A Field Research of “Wondering in the West” in a Pure E-drive Tourism Bus in Suzhou%环太湖“罗卡游”--苏州“漫行西部”旅游专线调查

    Institute of Scientific and Technical Information of China (English)

    韩超

    2016-01-01

    Suzhou Kinglong contributed a group of pure E-drive buses for tour-line of “Wondering in the West”for Suzhou municipal government, which provided Suzhou citizen a happy tour and fun time with an environmental-friendly way of transport. Recently, reporter of magazine came to the Longkang Road Station and conducted a ifeld research of the operation of E-drive buses.

  12. St. Louis Metro Biodiesel (B20) Transit Bus Evaluation: 12-Month Final Report

    Energy Technology Data Exchange (ETDEWEB)

    Barnitt, R.; McCormick, R. L.; Lammert, M.

    2008-07-01

    The St. Louis Metro Bodiesel Transit Bus Evaluation project is being conducted under a Cooperative Research and Development Agreement between NREL and the National Biodiesel Board to evaluate the extended in-use performance of buses operating on B20 fuel. The objective of this research project is to compare B20 and ultra-low sulfur diesel buses in terms of fuel economy, veicles maintenance, engine performance, component wear, and lube oil performance.

  13. Yinlong Is Committed to be Responsible Corporate Citizen%格力电器与珠海银隆:强强联合发挥协同效应

    Institute of Scientific and Technical Information of China (English)

    崔柳青

    2016-01-01

    Yinlong has been consistently expanding its business scope in new energy ifelds with a great innovative spirit and business-focus, and would expectedly be targeting to the passenger-vehicles market. Currently, Yinlong’s LTO battery products have been widely applied to E-drive buses, city public buses, E-drive logistics vehicles and electric forklift, etc. and were recognized by all customers.

  14. Technical Reviews and Audits for Systems, Equipment and Computer Software. Volume 1

    Science.gov (United States)

    2009-09-15

    TRA) Deskbook – DUSD(S&T) (May 2005) 17. IMP & IMS Preparation and Use Guide Version 0.9 (21 October 2005) 18. ISO/ IEC STD 15939 Software...ordnance, radiated effects on power buses, lightning and surge protection) d. Preliminary EMI and EMC-critical environmental characteristics and...transmitter RFI with vehicle receivers and ordnance, radiated effects on power buses, lightning and surge protection) 4. EMI and EMC critical environmental

  15. Intelligent Public Transport System with Information Forensics and Security

    Directory of Open Access Journals (Sweden)

    Uma Nagaraj

    2011-08-01

    Full Text Available To increase the usability of a public transport system it needs to go under revolutionary changes in its operating procedure. It is an attempt to make this possible using recent computer technology, mobile computing advancements and Wi-Fi or GPRS.The Intelligent Public Transport Information System will be specifically developed for Commercial public Transport. In this System passenger can get information about all buses, routes, timings of buses and all stops in any particular route. This system includes two phases. One is for user and other for administrator. At user side, user can request for information about all buses, routes, timings of buses and all stops in any particular route using Wi-Fi or GPRS technology from his mobile or PDA. At administrator side, administrator can update, delete and insert information about all buses, routes, timings of buses, all stops in any particular route and helpline numbers. Administrator can have all rights about database operations .The administrator requires the authentication of smart card for addition or deletion of information from commercial public transport

  16. ANÁLISIS DE ALTERNATIVAS TECNOLÓGICAS Y ENERGÉTICAS PARA EL SISTEMA METROPLÚS BAJO UNA EVALUACIÓN INTEGRADA ENERGÍA, AMBIENTE, ECONOMÍA

    Directory of Open Access Journals (Sweden)

    Alzate Juan M

    2008-07-01

    Full Text Available Con un modelo de optimización multi­periodo, basado en programación lineal, y de tipo integrado Energía­Ambiente­Economía (MARKAL­Estándar, se estimaron impactos económicos, energéticos y ambientales de cinco alternativas tecnológicas para la flota de buses que atenderá la demanda de movilidad del sistema de transporte masivo de pasajeros, de mediana capacidad, del Área Metropolitana del Valle de Aburrá (Medellín – Colombia ­Sistema Metroplús­. Las alternativas son: (1buses impulsados con gas natural vehicular, (2buses impulsados con diesel local, (3buses impulsados con Euro­diesel III importado desde el golfo de México, (4una flota de buses mixta en proporciones 50/50 gas natural y diesel local y (5buses híbridos de diesel local. Los resultados resaltan las ventajas ambientales y económicas de la utilización de gas natural vehicular en este sistema, por encima de las demás alternativas tecnológicas consideradas.

  17. Technical evaluation of the proposed design modifications and technical specification changes for the R. E. Ginna Nuclear Power Plant, Unit 1

    Energy Technology Data Exchange (ETDEWEB)

    Selan, J.C.

    1980-01-01

    The present design uses undervoltage relays to sense the loss of offsite power. There are no Class 1E loads on the 4160-volt buses. This design consists of two relays per 480-volt Class 1E bus (two Class 1E buses per redundant load group) for the first level of undervoltage protection. An undervoltage condition (loss-of-voltage) will result in isolating the Class 1E buses from all offsite sources, initiating emergency diesel generator start and load shedding on the Class 1E buses, permitting closure of the diesel generator supply breakers, and lastly, the loads will be automatically time-sequenced onto the buses. Actuation begins with loss of voltage to 368 volts (77% of 480 volts). The existing system does not bypass the load-shedding feature once the emergency diesel generators are energizing the Class 1E buses. The licensee has proposed a design change which includes automatic degraded voltage protection. This modification consists of the addition of two time-delayed, undervoltage relays on each 480-volt Class 1E bus, to provide the second level of undervoltage protection.

  18. Fuzzy Approach to Critical Bus Ranking under Normal and Line Outage Contingencies

    CERN Document Server

    Shankar, Shobha

    2011-01-01

    Identification of critical or weak buses for a given operating condition is an important task in the load dispatch centre. It has become more vital in view of the threat of voltage instability leading to voltage collapse. This paper presents a fuzzy approach for ranking critical buses in a power system under normal and network contingencies based on Line Flow index and voltage profiles at load buses. The Line Flow index determines the maximum load that is possible to be connected to a bus in order to maintain stability before the system reaches its bifurcation point. Line Flow index (LF index) along with voltage profiles at the load buses are represented in Fuzzy Set notation. Further they are evaluated using fuzzy rules to compute Criticality Index. Based on this index, critical buses are ranked. The bus with highest rank is the weakest bus as it can withstand a small amount of load before causing voltage collapse. The proposed method is tested on Five Bus Test System.

  19. Formulating a simplified equivalent representation of distribution circuits for PV impact studies.

    Energy Technology Data Exchange (ETDEWEB)

    Reno, Matthew J.; Broderick, Robert Joseph; Grijalva, Santiago

    2013-04-01

    With an increasing number of Distributed Generation (DG) being connected on the distribution system, a method for simplifying the complexity of the distribution system to an equivalent representation of the feeder is advantageous for streamlining the interconnection study process. The general characteristics of the system can be retained while reducing the modeling effort required. This report presents a method of simplifying feeders to only specified buses-of-interest. These buses-of-interest can be potential PV interconnection locations or buses where engineers want to verify a certain power quality. The equations and methodology are presented with mathematical proofs of the equivalence of the circuit reduction method. An example 15-bus feeder is shown with the parameters and intermediate example reduction steps to simplify the circuit to 4 buses. The reduced feeder is simulated using PowerWorld Simulator to validate that those buses operate with the same characteristics as the original circuit. Validation of the method is also performed for snapshot and time-series simulations with variable load and solar energy output data to validate the equivalent performance of the reduced circuit with the interconnection of PV.

  20. A Study on the Occurrence of Injuries and Concept of Students on School Bus Safety in India

    Directory of Open Access Journals (Sweden)

    Somnath Gangopadhyay*, Samrat Dev, Tarannum Ara, Goutam Ghoshal and Tamal Das

    2011-01-01

    Full Text Available A school bus is used universally to transport school children to and from school. These are considered as the safest mode of transport in city areas in spite of poor ergonomic interior design and predominant unsafe condition. The study was performed among the students to find out their concept of safety regarding the interior design of school buses. For this study a questionnaire was developed and performed among three hundred urban students of eight different schools of Kolkata. The students were divided into three groups of equal strength: primary, middle and high. Each group had fifty male and fifty female students. From the analysis of questionnaire it was observed that all students were facing many unsafe and poor ergonomics related problems that lead to injuries while traveling in the school buses. It was further revealed that design of Indian school buses should be improved immediately

  1. Foothill Transit Battery Electric Bus Demonstration Results

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, Leslie [National Renewable Energy Lab. (NREL), Golden, CO (United States); Prohaska, Robert [National Renewable Energy Lab. (NREL), Golden, CO (United States); Kelly, Kenneth [National Renewable Energy Lab. (NREL), Golden, CO (United States); Post, Matthew [National Renewable Energy Lab. (NREL), Golden, CO (United States)

    2016-01-27

    Foothill Transit is collaborating with the California Air Resources Board and the U.S. Department of Energy's (DOE's) National Renewable Energy Laboratory (NREL) to evaluate its fleet of Proterra battery electric buses (BEBs) in revenue service. The focus of this evaluation is to compare performance of the BEBs to that of conventional technology and to track progress over time toward meeting performance targets. This project has also provided an opportunity for DOE to conduct a detailed evaluation of the BEBs and charging infrastructure. This report provides data on the buses from April 2014 through July 2015. Data are provided on a selection of compressed natural gas buses as a baseline comparison.

  2. American Fuel Cell Bus Project Evaluation. Second Report

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, Leslie [National Renewable Energy Lab. (NREL), Golden, CO (United States); Post, Matthew [National Renewable Energy Lab. (NREL), Golden, CO (United States)

    2015-09-01

    This report presents results of the American Fuel Cell Bus (AFCB) Project, a demonstration of fuel cell electric buses operating in the Coachella Valley area of California. The prototype AFCB was developed as part of the Federal Transit Administration's (FTA's) National Fuel Cell Bus Program. Through the non-profit consortia CALSTART, a team led by SunLine Transit Agency and BAE Systems developed a new fuel cell electric bus for demonstration. SunLine added two more AFCBs to its fleet in 2014 and another in 2015. FTA and the AFCB project team are collaborating with the U.S. Department of Energy (DOE) and DOE's National Renewable Energy Laboratory to evaluate the buses in revenue service. This report summarizes the performance results for the buses through June 2015.

  3. Scheduling bus services in Universiti Teknologi MARA (UiTM) Shah Alam

    Science.gov (United States)

    Omar, Mawardi; Ismail, Wan Rosmanira; Oughalime, Ahmed

    2014-09-01

    This study deals with bus scheduling problem in a local public university. Given existing bus daily trips, set of buses used and set of policy, the aims of this study are to optimize the use of buses for in-campus trips and to cover the trip demands. This study is conducted at Universiti Teknologi Mara (UiTM) Shah Alam that involves six-zone trips and a single depot. The bus scheduling problem in UiTM is formulated using the integer programming model and the LINGO 12.0 software is used for solving this bus scheduling model. The results of this model showed that the number of buses can be reduced during off-peak hours. Furthermore, optimal trips can also be identified from the results.

  4. Power flow control for transmission networks with implicit modeling of static synchronous series compensator

    DEFF Research Database (Denmark)

    Kamel, S.; Jurado, F.; Chen, Zhe

    2015-01-01

    This paper presents an implicit modeling of Static Synchronous Series Compensator (SSSC) in Newton–Raphson load flow method. The algorithm of load flow is based on the revised current injection formulation. The developed model of SSSC is depended on the current injection approach. In this model......, the voltage source representation of SSSC is transformed to current source, and then this current is injected at the sending and auxiliary buses. These injected currents at the terminals of SSSC are a function of the required line flow and voltage of buses. These currents can be included easily...... to the original mismatches at the terminal buses of SSSC. The developed model can be used to control active and reactive line flow together or individually. The implicit modeling of SSSC device decreases the complexity of load flow code, the modification of Jacobian matrix is avoided, the change only...

  5. Implementation of a Real Time Passenger Information System

    CERN Document Server

    Ganesh, K; Kuri, Joy; Dagale, Haresh; Sudhakar, G; Sanyal, Sugata

    2012-01-01

    Intelligent Transportation Systems (ITS) are gaining recognition in developing countries like India. This paper describes the various components of our prototype implementation of a Real-time Passenger Information System (RTPIS) for a public transport system like a fleet of buses. Vehicle-mounted units, bus station units and a server located at the transport company premises comprise the system. The vehicle unit reports the current position of the vehicle to a central server periodically via General Packet Radio Service (GPRS). An Estimated Time of Arrival (ETA) algorithm running on the server predicts the arrival times of buses at their stops based on real-time observations of the buses' current Global Positioning System (GPS) coordinates. This information is displayed and announced to passengers at stops using station units, which periodically fetch the required ETA from the server via GPRS. Novel features of our prototype include: (a) a route creator utility which automatically creates new routes from scra...

  6. Anyuan Automobile:Moving Steadily Towards the Global Market An Interview with Su Liqian, General Manager of Wuxi Anyuan Automobile Co., Ltd

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    @@ Wuxi Anyuan Automobile Co., Ltd, located in Wuxi,China's Jiangsu Province,receives investment from Wuxi Anyuan Industry Joint Stock Co., Ltd as an R&D (research and development)center and as a production base for the export of luxurious passenger buses.The company's facilities cover a large area of 90,000 square meters. During the first phase of construction, factory buildings with a floor area of 15,000 square meters were erected, enabling an annual production capacity of 1,500 buses, worth of RMB 0.5 billion. During the second phase, another 20,000 square meters were allocated for use as factory buildings, which brought the company's annual production capacity to 5,000 buses, worth of RMB 1.5 billion. Among the company's 1,200 employees, 196 are working as technical or managerial personnel.

  7. Performance evaluation of UHF RFID technologies for real-time bus recognition in the Taipei Bus Station.

    Science.gov (United States)

    Own, Chung-Ming; Lee, Da-Sheng; Wang, Ti-Ho; Wang, De-Jun; Ting, Yu-Lun

    2013-06-18

    Transport stations such as airports, ports, and railways have adopted blocked-type pathway management to process and control travel systems in a one-directional manner. However, this excludes highway transportation where large buses have great variability and mobility; thus, an instant influx of numerous buses increases risks and complicates station management. Focusing on Taipei Bus Station, this study employed RFID technology to develop a system platform integrated with modern information technology that has numerous characteristics. This modern information technology comprised the following systems: ultra-high frequency (UHF) radio-frequency identification (RFID), ultrasound and license number identification, and backstage graphic controls. In conclusion, the system enabled management, bus companies, and passengers to experience the national bus station's new generation technology, which provides diverse information and synchronization functions. Furthermore, this technology reached a new milestone in the energy-saving and efficiency-increasing performance of Taiwan's buses.

  8. Zero Emission Bay Area (ZEBA) Fuel Cell Bus Demonstration Results: Third Report

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, L.; Post, M.

    2014-05-01

    This report presents results of a demonstration of 12 fuel cell electric buses (FCEB) operating in Oakland, California. The 12 FCEBs operate as a part of the Zero Emission Bay Area (ZEBA) Demonstration, which also includes two new hydrogen fueling stations. This effort is the largest FCEB demonstration in the United States and involves five participating transit agencies. The ZEBA partners are collaborating with the U.S. Department of Energy (DOE) and DOE's National Renewable Energy Laboratory (NREL) to evaluate the buses in revenue service. NREL has published two previous reports, in August 2011 and July 2012, describing operation of these buses. New results in this report provide an update covering eight months through October 2013.

  9. http://www.ajer.org/papers/v4(10/A04100107.pdf

    Directory of Open Access Journals (Sweden)

    J. U. Agber

    2015-10-01

    Full Text Available Control of reactive power and voltage constitute part of the major challenge in the power system industry. Adequate absorption or injection of reactive power into electric power transmission systems solves power quality problems like voltage profile maintenance at all power transmission levels, transmission efficiency and system stability. Globally, there is increasing demand for electricity to feed the technology-driven economy, while the commensurate expansion of power generation and transmission to meet up with such demand has been severely limited due to inadequate resources and environmental factors. Flexible AC Transmission System (FACTS controllers, such as the Static VAr Compensator (SVC, employ latest technology in the design of power electronic switching devices for electric power transmission systems to control voltage and power flow, and improve voltage regulation without the need to expand the power generation and transmission facilities. In this work, the capability of SVC in stabilizing power system’s voltage through reactive power compensation was investigated. Power flow equations involving voltage drop with/without SVC were developed. Modeling equations for SVC were also developed and used to determine its parameters. The Nigeria 330kV network, 28-bus power system used for the study was modeled using MATLAB/SIMULINK software. From the simulations, the compensated and uncompensated voltages at each of the 28 buses were evaluated. It was observed from the analysis that some buses in the network had very weak voltage profile consequent to either excessive generation or absorption of the reactive power at such buses. It is therefore pertinent to note that not all the buses within the network need voltage compensation and as such, only buses with very weak voltage profile require the incorporation of SVC. Hence it can be concluded that in order to enhance the transmission system performance of the Nigerian 330kV power system, the

  10. Zero Emission Bay Area (ZEBA) Fuel Cell Bus Demonstration: First Results Report

    Energy Technology Data Exchange (ETDEWEB)

    Chandler, K.; Eudy, L.

    2011-08-01

    This report documents the early implementation experience for the Zero Emission Bay Area (ZEBA) Demonstration, the largest fleet of fuel cell buses in the United States. The ZEBA Demonstration group includes five participating transit agencies: AC Transit (lead transit agency), Santa Clara Valley Transportation Authority (VTA), Golden Gate Transit (GGT), San Mateo County Transit District (SamTrans), and San Francisco Municipal Railway (Muni). The ZEBA partners are collaborating with the U.S. Department of Energy (DOE) and DOE's National Renewable Energy Laboratory (NREL) to evaluate the buses in revenue service.

  11. Americans With Disabilities Act (ADA) Accessibility Guidelines for Transportation Vehicles. Final rule.

    Science.gov (United States)

    2016-12-14

    The Architectural and Transportation Barriers Compliance Board (Access Board or Board) is issuing a final rule that revises its existing accessibility guidelines for non-rail vehicles--namely, buses, over-the-road buses, and vans--acquired or remanufactured by entities covered by the Americans with Disabilities Act. The revised guidelines ensure that such vehicles are readily accessible to, and usable by, individuals with disabilities. The U.S. Department of Transportation (DOT) is required to revise its accessibility standards for transportation vehicles acquired or remanufactured by entities covered by the Americans with Disabilities Act (ADA) to be consistent with the final rule.

  12. BC Transit Fuel Cell Bus Project Evaluation Results: Second Report

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, L.; Post, M.

    2014-09-01

    Second report evaluating a fuel cell electric bus (FCEB) demonstration led by British Columbia Transit (BC Transit) in Whistler, Canada. BC Transit is collaborating with the California Air Resources Board and the U.S. Department of Energy's National Renewable Energy Laboratory to evaluate the buses in revenue service. NREL published its first report on the demonstration in February 2014. This report is an update to the previous report; it covers 3 full years of revenue service data on the buses from April 2011 through March 2014 and focuses on the final experiences and lessons learned.

  13. Power Transfer Efficiency of Mutually Coupled Coils in an Aluminum AUV Hull

    Science.gov (United States)

    2013-12-01

    currently being used by electric buses, trains, and cars as a method for wirelessly charging these vehicles through an air gap [4]. The benefit of...coils and near-field magnetic coupling for power transfer in a system. IPT is currently being used by electric buses, trains, and cars as a method...1899 Nikola Tesla attempted to transmit power without wires. His goal was to transmit 300 kW of power using a 150 kHz carrier wave [7]. Tesla’s

  14. Flexible programmable logic module

    Energy Technology Data Exchange (ETDEWEB)

    Robertson, Perry J. (Albuquerque, NM); Hutchinson, Robert L. (Albuquerque, NM); Pierson, Lyndon G. (Albuquerque, NM)

    2001-01-01

    The circuit module of this invention is a VME board containing a plurality of programmable logic devices (PLDs), a controlled impedance clock tree, and interconnecting buses. The PLDs are arranged to permit systolic processing of a problem by offering wide data buses and a plurality of processing nodes. The board contains a clock reference and clock distribution tree that can drive each of the PLDs with two critically timed clock references. External clock references can be used to drive additional circuit modules all operating from the same synchronous clock reference.

  15. Estudio de factibilidad de un servicio de transporte público complementario al tranvía de Ayacucho por medio de servicios alimentadores

    OpenAIRE

    Jiménez Ospina, David

    2016-01-01

    De acuerdo con el plan de desarrollo para la ciudad de Medellín, se creó el corredor verde de Ayacucho, el cual se implementó con un sistema masivo de transporte público con tecnología tranviaria, alimentada por dos cables y un sistema de buses alimentadores -- Dentro de dicho plan se contempla el proceso de racionalización de las empresas de buses tradicionales de la zona, dicho proceso generará una demanda que el mismo tranvía, con su capacidad y su modelo operacional no podrá satisfacer; p...

  16. Black carbon and polycyclic aromatic hydrocarbon emissions from vehicles in the United States-Mexico border region: pilot study.

    Science.gov (United States)

    Kelly, Kerry; Wagner, David; Lighty, JoAnn; Quintero Núñez, Margarito; Vazquez, F Adrian; Collins, Kimberly; Barud-Zubillaga, Alberto

    2006-03-01

    The investigators developed a system to measure black carbon (BC) and particle-bound polycyclic aromatic hydrocarbon (PAH) emission factors during roadside sampling in four cities along the United States-Mexico border, Calexico/Mexicali and El Paso/Juarez. The measurement system included a photoacoustic analyzer for BC, a photoelectric aerosol sensor for particle-bound PAHs, and a carbon dioxide (CO2) analyzer. When a vehicle with measurable emissions passed the system probe, corresponding BC, PAH, and CO2 peaks were evident, and a fuel-based emission factor was estimated. A picture of each vehicle was also recorded with a digital camera. The advantage of this system, compared with other roadside methods, is the direct measurement of particulate matter components and limited interference from roadside dust. The study revealed some interesting trends: Mexican buses and all medium-duty trucks were more frequently identified as high emitters of BC and PAH than heavy-duty trucks or passenger vehicles. In addition, because of the high daily mileage of buses, they are good candidates for additional study. Mexican trucks and buses had higher average emission factors compared with U.S. trucks and buses, but the differences were not statistically significant. Few passenger vehicles had measurable BC and PAH emissions, although the highest emission factor came from an older model passenger vehicle licensed in Baja California.

  17. Golden Dragon Keeps Good Reputation in Syria%金旅客车:坚守叙利亚

    Institute of Scientific and Technical Information of China (English)

    田琼芳

    2016-01-01

    Golden Dragon exported its ifrst group of buses to Syria in 2009, since when the company had won a good reputation among the local customers with high quality product and excellent service. Nowadays Golden Dragon has been widely recognized in this country.

  18. SMES: Superconducting Magnetic Energy Storage

    Science.gov (United States)

    1993-01-01

    power to magnetically levitated trains . A very small size SMES can poten- tially be part of a hybrid propul- sion system on large transit buses...potentially lead to the increased use of urban transit, maglev and electric vehicles, thereby re- ducing air pollution. Illustration courtesy of

  19. Programmable architecture for quantum computing

    NARCIS (Netherlands)

    Chen, J.; Wang, L.; Charbon, E.; Wang, B.

    2013-01-01

    A programmable architecture called “quantum FPGA (field-programmable gate array)” (QFPGA) is presented for quantum computing, which is a hybrid model combining the advantages of the qubus system and the measurement-based quantum computation. There are two kinds of buses in QFPGA, the local bus and t

  20. Travel Tips Help IBS Sufferers Enjoy Their Vacations

    Science.gov (United States)

    ... can feel more in control when traveling." IFFGD's travel tips include: Allow enough time in the morning to get to the airport ... Map your walking and driving routes ahead of time and determine how to get ... and directly as possible. Some people may avoid buses, boats and other ...

  1. Philanthropist in Juvenile Reformatory

    Institute of Scientific and Technical Information of China (English)

    HAN NIU

    2007-01-01

    @@ On the afternoon of February 1, 2007, Chen Guangbiao, a noted philanthropist, found himself in the Jiangsu Provincial Juvenile Reformatory in Jurong City for a ceremony to donate two buses, 100 computers, and 100 desks and 100 chairs for the juvenile offenders to use in their study.

  2. 76 FR 44663 - Accessibility Guidelines for Pedestrian Facilities in the Public Right-of-Way

    Science.gov (United States)

    2011-07-26

    ... constraints include, but are not limited to, underlying terrain, right-of-way availability, underground... flangeway gaps; On-street parking that is marked or metered, and passenger loading zones; Pedestrian signs... parking, and escalators. The requirements for transit stops and transit shelters used by buses and...

  3. School Transportation.

    Science.gov (United States)

    Executive Educator, 1990

    1990-01-01

    This special section on student transportation offers a case study of a school system that recycles buses for safety drills; articles on fuel-saving strategies, the pros and cons of contracting for transportation services or operating a publicly owned bus fleet, and advice on full cost accounting for transportation costs; and a transportation…

  4. SunLine Transit Agency Fuel Cell Transit Bus: Fifth Evaluation Report (Report and Appendices)

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, L.; Chandler, K.

    2009-08-01

    This report describes operations at SunLine Transit Agency for a prototype fuel cell bus and five compressed natural gas (CNG) buses. This is the fifth evaluation report for this site, and it describes results and experiences from October 2008 through June 2009. These results are an addition to those provided in the previous four evaluation reports.

  5. SunLine Transit Agency Fuel Cell Transit Bus: Fourth Evaluation Report (Report and Appendices)

    Energy Technology Data Exchange (ETDEWEB)

    Chandler, K.; Eudy, L.

    2009-01-01

    This report describes operations at SunLine Transit Agency for a prototype fuel cell bus and five new compressed natural gas (CNG) buses. This is the fourth evaluation report for this site, and it describes results and experiences from April 2008 through October 2008. These results are an addition to those provided in the previous three evaluation reports.

  6. 36 CFR 1192.35 - Public information system.

    Science.gov (United States)

    2010-07-01

    ... 36 Parks, Forests, and Public Property 3 2010-07-01 2010-07-01 false Public information system... Buses, Vans and Systems § 1192.35 Public information system. (a) Vehicles in excess of 22 feet in length, used in multiple-stop, fixed-route service, shall be equipped with a public address system...

  7. 49 CFR 38.35 - Public information system.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 1 2010-10-01 2010-10-01 false Public information system. 38.35 Section 38.35... SPECIFICATIONS FOR TRANSPORTATION VEHICLES Buses, Vans and Systems § 38.35 Public information system. (a... a public address system permitting the driver, or recorded or digitized human speech messages,...

  8. Hybrid vehicle potential assessment. Volume 7. Hybrid vehicle review

    Energy Technology Data Exchange (ETDEWEB)

    Leschly, K.O.

    1979-09-30

    Review of hybrid vehicles (HVs) built during the past ten years or planned to be built in the near future is presented. An attempt is made to classify and analyze these vehicles to get an overall picture of their key characteristics. The review includes on-road hybrid passenger cars, trucks, vans, and buses.

  9. Designing Sustainable Public Transportation: Integrated Optimization of Bus Speed and Holding Time in a Connected Vehicle Environment

    Directory of Open Access Journals (Sweden)

    Wei Wu

    2016-11-01

    Full Text Available Developing public transportation and giving priority to buses is a feasible solution for improving the level of public transportation service, which facilitates congestion alleviation and prevention, and contributes to urban development and city sustainability. This paper presents a novel bus operation control strategy including both holding control and speed control to improve the level of service of transit systems within a connected vehicle environment. Most previous work focuses on optimization of signal timing to decrease the bus signal delay by assuming that holding control is not applied; the speed of buses is given as a constant input and the acceleration and deceleration processes of buses can be neglected. This paper explores the benefits of a bus operation control strategy to minimize the total cost, which includes bus signal delay, bus holding delay, bus travel delay, acceleration cost due to frequent stops and intense driving. A set of formulations are developed to explicitly capture the interaction between bus holding control and speed control. Experimental analysisand simulation tests have shown that the proposed integrated operational model outperforms the traditional control, speed control only, or holding control only strategies in terms of reducing the total cost of buses. The sensitivity analysis has further demonstrated the potential effectiveness of the proposed approach to be applied in a real-time bus operation control system under different levels of traffic demand, bus stop locations, and speed limits.

  10. Engineering synergy in biotechnology

    DEFF Research Database (Denmark)

    Nielsen, Jens; Fussenegger, Martin; Keasling, Jay

    2014-01-01

    In this article, the author focuses on approaches in metabolic engineering and synthetic biology for the creation of efficient cell factories, which can be bused to convert biomass and other feedstocks for the generation of chemicals. Topics discussed include development of restriction enzymes, e...

  11. Diesel Engine Technician

    Science.gov (United States)

    Tech Directions, 2010

    2010-01-01

    Diesel engine technicians maintain and repair the engines that power transportation equipment such as heavy trucks, trains, buses, and locomotives. Some technicians work mainly on farm machines, ships, compressors, and pumps. Others work mostly on construction equipment such as cranes, power shovels, bulldozers, and paving machines. This article…

  12. 49 CFR 38.33 - Fare box.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 1 2010-10-01 2010-10-01 false Fare box. 38.33 Section 38.33 Transportation Office of the Secretary of Transportation AMERICANS WITH DISABILITIES ACT (ADA) ACCESSIBILITY SPECIFICATIONS FOR TRANSPORTATION VEHICLES Buses, Vans and Systems § 38.33 Fare box. Where provided, the farebox shall be located as far forward as...

  13. 36 CFR 1192.33 - Fare box.

    Science.gov (United States)

    2010-07-01

    ... 36 Parks, Forests, and Public Property 3 2010-07-01 2010-07-01 false Fare box. 1192.33 Section 1192.33 Parks, Forests, and Public Property ARCHITECTURAL AND TRANSPORTATION BARRIERS COMPLIANCE BOARD AMERICANS WITH DISABILITIES ACT (ADA) ACCESSIBILITY GUIDELINES FOR TRANSPORTATION VEHICLES Buses, Vans and Systems § 1192.33 Fare box. Where...

  14. Proceedings for the DoD Cultural Resources Workshop: Prioritizing Cultural Resources Needs in Support of a Sound Investment Strategy

    Science.gov (United States)

    2006-07-01

    Proceedings Appendix B: Agenda DoD Cultural Resources Workshop Seattle Marriot SEA-TAC Hotel 3201 South 176th Street, Seattle...Group 3: Management (Evergreen Salon I) Group 4: Knowledge Management (Washington Salon E) 1200 Lunch 1300 Load Buses for Field Tour Lobby of Hotel

  15. 26 CFR 48.4221-1 - Tax-free sales; general rule.

    Science.gov (United States)

    2010-04-01

    ...) MISCELLANEOUS EXCISE TAXES MANUFACTURERS AND RETAILERS EXCISE TAXES Exemptions, Registration, Etc. § 48.4221-1...(e)(3) relating to the sale of tires used on intercity, local, or school buses (see § 48.4221-8). (3... for which the article or articles are being purchased and the registration number of the...

  16. Eleven Ways To Make Money.

    Science.gov (United States)

    Vail, Kathleen

    1998-01-01

    Many school districts are becoming aggressively entrepreneurial in their efforts to raise money. One district serves as the Internet service provider for their area, another rents buses and drivers to community groups. A sidebar describes a controversial deal between Coca-Cola and the Colorado Springs School District. (MLF)

  17. Compensation technique for Q-limit enforcements in a constant complex Jacobian power flow model

    Energy Technology Data Exchange (ETDEWEB)

    Raju, V.B.; Bijwe, P.R.; Nanda, J. (Dept. of Electrical Engineering, Indian Inst. of Technology, Delhi, New Delhi 110 016 (IN))

    1990-01-01

    This paper presents a simple and efficient compensation technique to deal with but-type switchings associated with Q-limit enforcement at voltage controlled (PV) buses in a constant Jacobian power flow model. The Jacobian is expressed in the complex variable form resulting in reduced storage requirements as compared to real form of representation of the Jacobian. The structure of the Jacobian is preserved irrespective of bus-type switchings while Q-limit enforcements are performed at the PV buses. This feature permits implementation of optimal ordering of buses in an efficient way while factorizing the Jacobian matrix. The Jacobian is held constant throughout the load flow solution process. Incremental secondary injections (ISIs) are provided at the respective PV buses to maintain the specified voltages. The required injections are computed from the proposed compensation model. Results indicate that the proposed technique is quite efficient as the number of iterations for solution to converge, irrespective of bus-type switchings remains same as that in unadjusted solution case.

  18. Diesel versus compressed natural gas in Transmilenio-Bogotá: innovation, precaution, and distribution of risk

    DEFF Research Database (Denmark)

    Pineda, Andres Felipe Valderrama

    2007-01-01

    During the period 1998–2000, municipal officials in Bogotá implemented a new transportation system for the city. Transmilenio became the first major mass transportation system in the world to use only buses. The authors examine here the process that led to the design decision to power all...

  19. Biodiesel from waste cooking oil in Mexico City.

    Science.gov (United States)

    Sheinbaum, Claudia; Balam, Marco V; Robles, Guillermo; Lelo de Larrea, Sebastian; Mendoza, Roberto

    2015-08-01

    The aim of this article is to evaluate the potential use of biodiesel produced from waste cooking oil in Mexico City. The study is divided in two main areas: the analysis of a waste cooking oil collection pilot project conducted in food markets of a Mexico City region; and the exhaust emissions performance of biodiesel blends measured in buses of the Mexico City public bus transportation network (RTP). Results from the waste cooking oil collection pilot project show that oil quantities disposed depend upon the type of food served and the operational practices in a cuisine establishment. Food markets' waste cooking oil disposal rate from fresh oil is around 10%, but with a very high standard deviation. Emission tests were conducted using the Ride-Along-Vehicle-Emissions-Measuring System in two different types of buses while travelling a regular route. Results shows that the use of biodiesel blends reduces emissions only for buses that have exhaust gas recirculation systems, as analysed by repeated measure analysis of variance. The potential use in Mexico City of waste cooking oil for biodiesel is estimated to cover 2175 buses using a B10 blend.

  20. Analysis of Non-Tactical Vehicle Utilization at Fort Carson

    Science.gov (United States)

    2012-03-30

    Wagons Passenger Vans Sport Utility Vehicles Light- Duty Trucks Medium- Duty Trucks Heavy- Duty Trucks Buses Total/ Average # Vehicles...ranging far away from the base. One went to the Army’s Piñon Canyon training facility in southern Colorado while the other (a 12-psgr executive

  1. COMPARISON OF PARALLEL AND SERIES HYBRID POWERTRAINS FOR TRANSIT BUS APPLICATION

    Energy Technology Data Exchange (ETDEWEB)

    Gao, Zhiming [ORNL; Daw, C Stuart [ORNL; Smith, David E [ORNL; Jones, Perry T [ORNL; LaClair, Tim J [ORNL; Parks, II, James E [ORNL

    2016-01-01

    The fuel economy and emissions of both conventional and hybrid buses equipped with emissions aftertreatment were evaluated via computational simulation for six representative city bus drive cycles. Both series and parallel configurations for the hybrid case were studied. The simulation results indicate that series hybrid buses have the greatest overall advantage in fuel economy. The series and parallel hybrid buses were predicted to produce similar CO and HC tailpipe emissions but were also predicted to have reduced NOx tailpipe emissions compared to the conventional bus in higher speed cycles. For the New York bus cycle (NYBC), which has the lowest average speed among the cycles evaluated, the series bus tailpipe emissions were somewhat higher than they were for the conventional bus, while the parallel hybrid bus had significantly lower tailpipe emissions. All three bus powertrains were found to require periodic active DPF regeneration to maintain PM control. Plug-in operation of series hybrid buses appears to offer significant fuel economy benefits and is easily employed due to the relatively large battery capacity that is typical of the series hybrid configuration.

  2. 24 CFR 3280.802 - Definitions.

    Science.gov (United States)

    2010-04-01

    ..., flexible metal conduit, electrical metallic tubing, underfloor raceways, cellular concrete floor raceways... supply. (15) Distribution panelboard means a single panel or a group of panel units designed for assembly in the form of a single panel, including buses, and with or without switches or automatic...

  3. A port-Hamiltonian approach to power network modeling and analysis

    NARCIS (Netherlands)

    Fiaz, S.; Zonetti, D.; Ortega, R.; Scherpen, J.M.A.; van der Schaft, A.J.

    2013-01-01

    In this paper we present a systematic framework for modeling of power networks. The basic idea is to view the complete power network as a port-Hamiltonian system on a graph where edges correspond to components of the power network and nodes are buses. The interconnection constraints are given by the

  4. 76 FR 4298 - Certain New Pneumatic Off-the-Road Tires From the People's Republic of China: Notice of...

    Science.gov (United States)

    2011-01-25

    ... homes, motorcycles, bicycles, on- road or on-highway trailers, light trucks, and trucks and buses. Such... that have been cut down to a truck or trailer for transport to a mill or other destination. \\12\\ Skid... location to another, carry material in their buckets, or load material into a truck or trailer. \\15\\...

  5. Wind Power: An Emerging Energy Resource

    Science.gov (United States)

    Deal, Walter F.

    2010-01-01

    One may ask the question, What is energy? Typically the first answers that come to mind are oil, coal, and natural gas or nuclear energy. Most human activities require some form of energy consumption. This may be the energy produced by the food that one eats or the gasoline that is used in cars, trucks, buses, and other vehicles. One cannot ignore…

  6. 75 FR 16913 - Transmission Relay Loadability Reliability Standard

    Science.gov (United States)

    2010-04-02

    ... line (including any series elements such as transformers) that emanates from the remote buses. All.... Applicability 20 D. Generator Step-Up and Auxiliary Transformers......... 98 1. Omission From the Reliability Standard 98 2. Generator Step-Up Transformer Relays as Back-up 109 Protection E. Need to Address...

  7. Problems Incident to Urban School Desegregation: An Institute for School Administrators of the Buffalo and Niagara Falls Public Schools. Interim Report Draft.

    Science.gov (United States)

    McKelvey, Troy V.

    An Institute funded under Title IV of the 1964 Civil Rights Act was held during 1968-69 in order to concentrate on the attitudes of the administrative leadership of the schools involved in a busing program. The purpose of the Institute was to initiate and evaluate action programs to facilitate the implementation of the School System's…

  8. 49 CFR 37.195 - Purchase or lease of OTRBs by private entities not primarily in the business of transporting people.

    Science.gov (United States)

    2010-10-01

    ... primarily in the business of transporting people. 37.195 Section 37.195 Transportation Office of the... transporting people. This section applies to all purchases or leases of new vehicles by private entities which are not primarily engaged in the business of transporting people, with respect to buses delivered...

  9. 76 FR 37309 - Parts and Accessories Necessary for Safe Operation; Application for Exemption From the Natural...

    Science.gov (United States)

    2011-06-27

    ... years. In the 1990's, the American Public Transportation Association (APTA) developed a model specification for low-floor natural gas transit buses. The APTA specification was published in 2000 and it... compressed fuel like natural gas. \\1\\ APTA, Standard Bus Procurement Guidelines: 40 ft. Low-Floor...

  10. Increasing the Options for Wholesome Peer Level Experiences Across Racial, Cultural, and Economic Lines; Highlights of the Eighth National Conference on Equal Educational Opportunity, Washington, D.C., February 19-21, 1970.

    Science.gov (United States)

    Kepecs, Mary, Ed.; Ross, Ellen, Ed.

    This booklet is comprised of summaries of contributions to the Eighth National Conference on Equal Educational Opportunity. National Education Association President, George Fischer, expresses views about changing attitudes, cultural differences, Southern school desegregation, busing, and the Nixon administration. Mrs. LaDonna Harris, a Comanche…

  11. 49 CFR 37.201 - Intermediate and rest stops.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 1 2010-10-01 2010-10-01 false Intermediate and rest stops. 37.201 Section 37.201... DISABILITIES (ADA) Over-the-Road Buses (OTRBs) § 37.201 Intermediate and rest stops. (a) Whenever an OTRB makes an intermediate or rest stop, a passenger with a disability, including an individual using...

  12. Secondary Voltage Control for Harmonics Suppression in Islanded Microgrids

    DEFF Research Database (Denmark)

    Wang, Xiongfei; Guerrero, Josep M.; Blaabjerg, Frede

    2011-01-01

    This paper proposes a secondary voltage waveform control approach to suppress harmonics in islanded microgrids. Compared with the secondary control for traditional large power systems, the proposed control scheme can regulate the voltage waveform instead of voltage magnitude of sensitive buses in...

  13. Olympic Legislation Requirements

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Management of the number of visitors to the city during the Olympic Games Rules related to free transportation services on railways, highways and city buses Regulations on traffic control and special traffic routes Regulations involving dogs, such as seeing-eye dogs, in public places

  14. 49 CFR 37.203 - Lift maintenance.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 1 2010-10-01 2010-10-01 false Lift maintenance. 37.203 Section 37.203... DISABILITIES (ADA) Over-the-Road Buses (OTRBs) § 37.203 Lift maintenance. (a) The entity shall establish a system of regular and frequent maintenance checks of lifts sufficient to determine if they are...

  15. Episome-Based Gene Therapy Strategy for Treatment of Human Breast Cancer

    Science.gov (United States)

    1998-01-01

    Burant CF, Inabnett T, Scott A, Buse MG, Sensa DA and Garvin AJ (1988). Detection of type I insulin-like growth factor (IGF) receptors in Wilm’s tumor...W. M.. Rossen, R. D., Laughter, A. H., Trial, J., Kessler, D. J., Zcndegui, J. G, Hogan, M. E. & Orson , F. M. (1992)./. Biol. Chan. 267,5712-5721

  16. Real-time network performance characterization : Locbus v.s. RTnet

    NARCIS (Netherlands)

    Buit, E.

    2004-01-01

    The aim of this project is to get insight how Real-time Ethernet behaves with respect to the field bus called Locbus. By writing a benchmarks for both systems the characterisations of both buses is performed. The transmission is time, the time which necessary to get the data to and of the card. Vari

  17. Demonstration of Alternative Fuel, Light and Heavy Duty Vehicles in State and Municipal Vehicle Fleets

    Energy Technology Data Exchange (ETDEWEB)

    Kennedy, John H.; Polubiatko, Peter; Tucchio, Michael A.

    2002-02-06

    This project involved the purchase of two Compressed Natural Gas School Buses and two electric Ford Rangers to demonstrate their viability in a municipal setting. Operational and maintenance data were collected for analysis. In addition, an educational component was undertaken with middle school children. The children observed and calculated how electric vehicles could minimize pollutants through comparison to conventionally powered vehicles.

  18. Procesamiento de Eventos Complejos en Arquitecturas Orientadas a Servicios 2.0

    OpenAIRE

    Boubeta-Puig, Juan

    2013-01-01

    En este documento se describen las arquitecturas orientadas a servicios, las arquitecturas dirigidas por eventos, los buses de servicios empresariales, las arquitecturas orientadas a servicios y dirigidas por eventos, y el procesamiento de eventos complejos. Además, se propone la integración del procesamiento de eventos complejos con las arquitecturas orientadas a servicios y dirigidas por eventos.

  19. De bezetting van voertuigen jaarlijks gemeten : resultaten van SWOV-metingen aan zeven voertuigcategorieën in de periode 1976 t/m 1984. Artikel in Verkeerskunde, Vol. 36 , No. 7 (juli), p. 332-334.

    NARCIS (Netherlands)

    Harris, S.

    1985-01-01

    In order to be able to convert vehicle-kilometre data from traffic counts into kilometres travelled, the daytime occupancy of seven vehicle categories on six different road sites has been counted one week a year in May. The seven categories are: cars, mini-buses, delivery vans, lorries, motorbikes,

  20. De bezetting van voertuigen 1976 t/m 1985 : resultaten van SWOV-metingen aan zeven voertuigcategoriëen.

    NARCIS (Netherlands)

    Arnoldus, J.G. & Scholtens, H.P.

    1985-01-01

    In order to be able to convert vehicle-kilometre data from traffic counts into kilometres travelled, the daytime occupancy of seven vehicle categories on six different road sites in the netherlands has been counted during one week a year in may. The seven categories are: cars, mini-buses, delivery

  1. Fuel cell transit bus development & commercialization programs at Gerogetown University

    Energy Technology Data Exchange (ETDEWEB)

    Wimmer, R.; Larkins, J.; Romano, S. [Georgetown Univ., Washington, DC (United States)

    1996-12-31

    Fourteen years ago, Georgetown University (GU) perceived the need for a clean, efficient power systems for transportation that could operate on non-petroleum based fuels. The transit bus application was selected to begin system development. GU recognized the range and recharge constraints of a pure battery powered transit bus. A Fuel Cell power system would circumvent these limitations and, with an on board reformer, accommodate liquid fuel for rapid refueling. Feasibility studies for Fuel Cell power systems for transit buses were conducted with the Los Alamos National Laboratory in 1983. Successful results of this investigation resulted in the DOT/DOE Fuel Cell transit bus development program. The first task was to prove that small Fuel Cell power plants were possible. This was achieved with the Phase I development of two 25 kW Phosphoric Acid Fuel Cell (PAFC) brassboard systems. A liquid cooled version was selected for the Phase II activity in which three 30-foot Fuel Cell powered Test Bed Buses (TBBs) were fabricated. The first of these TBBs was delivered in the spring of 1994. All three of these development vehicles are now in Phase III of the program to conduct testing and evaluation, is conducting operational testing of the buses. The test will involve two fuel cell-operated buses; one with a proton exchange fuel cell and the other with a phosphoric acid fuel cell.

  2. The Fuel Cells Are Coming

    Institute of Scientific and Technical Information of China (English)

    1995-01-01

    By the middle of next year, three hydrogen-powered buses will be roving the streets of Washington,D. C.,Los Angeles,and Chicago as part of a government-sponsored test of the effectiveness of fuel cells and alternative fuels in reducing vehicle emissions.

  3. Low-floor bus design preferences of walking aid users during simulated boarding and alighting.

    Science.gov (United States)

    D'souza, Clive; Paquet, Victor; Lenker, James; Steinfeld, Edward; Bareria, Piyush

    2012-01-01

    Low-floor buses represent a significant improvement in accessible public transit for passengers with limited mobility. However, there is still a need for research on the inclusive design of transit buses to identify specific low-floor bus design conditions that are either particularly accommodating or challenging for passengers with functional and mobility impairments. These include doorway locations, seating configuration and the large front wheel-well covers that collectively impact boarding, alighting and interior movement of passengers. Findings from a laboratory study using a static full-scale simulation of a lowfloor bus to evaluate the impact of seating configuration and crowding on interior movement and accessibility for individuals with and without walking aids are presented (n=41). Simulated bus journeys that included boarding, fare payment, seating, and alighting were performed. Results from video observations and subjective assessments showed differences in boarding and alighting performance and users' perceptions of task difficulty. The need for assistive design features (e.g. handholds, stanchions), legroom and stowage space for walking aids was evident. These results demonstrate that specific design conditions in low-floor buses can significantly impact design preference among those who use walking aids. Consideration of ergonomics and inclusive design can therefore be used to improve the design of low-floor buses.

  4. 49 CFR 571.220 - Standard No. 220; School bus rollover protection.

    Science.gov (United States)

    2010-10-01

    .... S3. Applicability. This standard applies to school buses. S4. Requirements. When a force in Newtons.... S1. Scope. This standard establishes performance requirements for school bus rollover protection. S2... procedures. Each vehicle shall be capable of meeting the requirements of S4. when tested in accordance...

  5. 49 CFR 571.113 - Standard No. 113; Hood latch system.

    Science.gov (United States)

    2010-10-01

    ... Motor Vehicle Safety Standards § 571.113 Standard No. 113; Hood latch system. S1. Purpose and scope.... Application. This standard applies to passenger cars, multipurpose passenger vehicles, trucks, and buses. S3... engine, luggage, storage, or battery compartment. S4. Requirements. S4.1Each hood must be provided with...

  6. 49 CFR 571.124 - Standard No. 124; Accelerator control systems.

    Science.gov (United States)

    2010-10-01

    ... Federal Motor Vehicle Safety Standards § 571.124 Standard No. 124; Accelerator control systems. S1. Scope.... S3. Application. This standard applies to passenger cars, multi-purpose passenger vehicles, trucks, and buses. S4. Definitions. S4.1Driver-operated accelerator control system means all...

  7. 49 CFR 571.103 - Standard No. 103; Windshield defrosting and defogging systems.

    Science.gov (United States)

    2010-10-01

    ... defrosting and defogging systems. S1. Scope. This standard specifies requirements for windshield defrosting... passenger vehicles, trucks, and buses. S3. Definitions. Road load means the power output required to move a... driveline friction, rolling friction, and air resistance. S4. Requirements. (a) Except as provided...

  8. 49 CFR 571.101 - Standard No. 101; Controls and displays.

    Science.gov (United States)

    2010-10-01

    ... Motor Vehicle Safety Standards § 571.101 Standard No. 101; Controls and displays. S1. Scope. This... in selecting controls. S3. Application. This standard applies to passenger cars, multipurpose passenger vehicles, trucks, and buses. S4. Definitions. Adjacent, with respect to a control, telltale...

  9. Connecticut Transit (CTTRANSIT) Fuel Cell Transit Bus: Second Evaluation Report and Appendices

    Energy Technology Data Exchange (ETDEWEB)

    Chandler, K.; Eudy, L.

    2009-05-01

    This report describes operations at Connecticut Transit (CTTRANSIT) in Hartford for one prototype fuel cell bus and three new diesel buses operating from the same location. The evaluation period in this report (January 2008 through February 2009) has been chosen to coincide with a UTC Power propulsion system changeout that occurred on January 15, 2008.

  10. The Afro-American before the Burger Court, 1976-1978: Justice Granted or Justice Denied?

    Science.gov (United States)

    Gill, Robert Lewis

    1978-01-01

    Supreme Court rulings during 1976-78 on capital punishment; criminal justice and prisoner rights; busing and school desegregation; discrimination in housing and employment; rights of illegitimates and family relations; abortion, voting rights, tenant landlord relations; and "reverse discrimination" have had a significant impact on Black…

  11. What Kind Of Cars Do DPRK People Drive?

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    The DPRK has been a mystery country in the world.And people have been wondering what are behind its government's recent policy:the State began confiscating cars and small buses Japan-based auto makers produced.The policy took effect in the end of last year. This policy brought people an in-

  12. Tertiary Control of Voltage Unbalance Compensation for Optimal Power Quality in Islanded Microgrids

    DEFF Research Database (Denmark)

    Meng, Lexuan; Tang, Fen; Savaghebi, Mehdi;

    2014-01-01

    the voltage unbalance limits in local buses and DG terminals. This method realizes multi-power-quality-level control in a multi-bus islanded system by optimally utilizing DGs as distributed compensators and saves the investment for additional compensation equipment. Hardware-in-the-loop results demonstrate...

  13. Fault Tolerant Hardware/Software Architecture for Flight Critical Function

    Science.gov (United States)

    1985-09-01

    hace not ynt been tented or that have been disconnected to allow diagnosis of the neh function Secondly, system diagnosis for instal- lation .nd...can be noted in Figure I and Table . Tesie consist of: (1) replacing group A aircraft wiring by digital serial buses, thus saving up to 450 pounds of

  14. The Best Project: bioethanol for sustainable transport and public policies to encourage the use of ethanol; O Projeto Best: bioetanol para o transporte sustentavel e as politicas publicas de incentivo ao uso do etanol

    Energy Technology Data Exchange (ETDEWEB)

    Velazquez Gonzalez, Silvia Maria Stortini; Santos, Sandra Maria Apolinario; Moreira, Jose Roberto; Melo, Euler Hoffmann [Universidade Presbiteriana Mackenzie, Sao Paulo, SP (Brazil); Centro Nacional de Referencia em Biomassa (CENBIO), Sao Paulo, SP (Brazil)

    2010-07-01

    The usage of ethanol in buses is a reality in cities from Sweden, such as Stockholm. The technology of diesel bus adapted to operate with ethanol has been used in that country since 1985, with great success, mainly in the environmental point of view. With the intent of encouraging ethanol usage in urban public transportation aiming, among other goals, at the reduction of atmospheric pollution in the big urban centers, the BEST Project - BioEthanol for Sustainable Transport was created. Besides Sao Paulo (pioneer in the Americas), this project, encouraged by the European Union, counts with eight other cities located in Europe and Asia. In Brazil, the project was developed and coordinated by CENBIO - Brazilian Reference Center on Biomass, from the Electrotechnics and Energy Institute of USP. With the partnership of other institutions, the project is developed since 2007 and currently counts on two diesel buses adapted to operate with ethanol. The buses circulate in operatives from EMTU - Sao Paulo Metropolitan Company for Urban Transports, in the Jabaquara - Sao Mateus line, and in operative from SPTrans - Sao Paulo Transportations, in the Lapa - Vila Mariana corridor. This paper has as its purpose to present the BEST Project in Brazil, its partners and, mainly, the results from the demonstration tests performed in field, as well as the proposals of public policies that were elaborated and are being implemented. It is worth remembering that the technology of the buses pays attention to the EURO 5 strict emission Standards, a norm that was recently invigorated in Europe. (author)

  15. 77 FR 19132 - Federal Motor Vehicle Safety Standards; Bus Emergency Exits and Window Retention and Release

    Science.gov (United States)

    2012-03-30

    ... rating (GVWR) greater than 4,536 kilograms (10,000 pounds) (``large school buses''). The standard... does not have any significant impact on the quality of the human environment. Executive Order 13132... open the exit. Each release mechanism shall operate without the use of remote controls or tools,...

  16. Learning from James Coleman.

    Science.gov (United States)

    Kahlenberg, Richard D.

    2001-01-01

    Examines three works by James Coleman: "Equality of Educational Opportunity" (the Coleman Report), 1966; Coleman's study of school busing and white flight in the 1970s; and his 1980s research on the advantages of private schools. His conclusions included: social composition is more important than school spending and socioeconomic integration is…

  17. New Trails for the Community College.

    Science.gov (United States)

    Goodman, Shirley B.

    Mental patients from the local hospital and the community mental health/mental retardation (MH/MR) center are being helped to reenter community life through classes at Odessa College (Texas). Twice a week, patients who have been stabilized enough to attend day care at the MH/MR center, together with aides, are bused to the community college's…

  18. Driving into Euroland with AdBlue. Environmental friendly diesel technology for utility vehicles; Mit AdBlue ins Euroland. Umweltfreundliche Dieseltechnologie fuer Nutzfahrzeuge

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2006-07-01

    The SCR-diesel technology introduced by DaimlerChrysler has already established itself successfully in the field of utility vehicles under the name BlueTec. This drive technique already meets today the exhaust gas limiting values of tomorrow and is now also available for buses. (orig.)

  19. Commercial vehicle export in 2009:to dance while shackled?

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    For export salesmen of commercial vehicle manufacturers,the second half of 2008 was certainly not the best time. Mr Wang is working at a bus company which exports buses to Russia.From the second half of 2008,he found that partial clients began cancelling their orders and there were increasing such cases.

  20. Introduction of MAN Lion’s City Conceptual Articulated Bus%德国曼恩客车系列愈加丰富

    Institute of Scientific and Technical Information of China (English)

    云清文

    2016-01-01

    During IAA 2016, German based MAN demonstrated total of ten models of various buses including city-bus, city-to-city bus and long-distance bus, etc. Among all these models, the most innovative highlight is the model of MAN Lion’s City Conceptual Articulated bus, as well as the re-charging technology associated to it.

  1. China,and All That Jazz

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    EACH nation has characteristics that distinguish it from others. When thinking about Spain, flamenco music and paella come to mind. England has connotations of dismally wet weather (don’t forget your umbrella!), double-decker buses, and afternoon tea. France is known for

  2. 49 CFR 37.185 - Fleet accessibility requirement for OTRB fixed-route systems of large operators.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 1 2010-10-01 2010-10-01 false Fleet accessibility requirement for OTRB fixed....185 Fleet accessibility requirement for OTRB fixed-route systems of large operators. Each large... percent of the buses in its fleet with which it provides fixed-route service are readily accessible to...

  3. A Dynamic Programming based method for optimizing power system restoration with high wind power penetration

    DEFF Research Database (Denmark)

    Hu, Rui; Hu, Weihao; Li, Pengfei;

    2016-01-01

    . In this paper, the possibility to exploit the stochastic wind power during restoration was discussed, and a Dynamic Programming (DP) method was proposed to make wind power contribute in the restoration rationally as far as possible. In this paper, the method is tested and verified by a modified IEEE 30 Buses...

  4. The Afro-American before the Burger Court, 1976-1978: Justice Granted or Justice Denied?

    Science.gov (United States)

    Gill, Robert Lewis

    1978-01-01

    Supreme Court rulings during 1976-78 on capital punishment; criminal justice and prisoner rights; busing and school desegregation; discrimination in housing and employment; rights of illegitimates and family relations; abortion, voting rights, tenant landlord relations; and "reverse discrimination" have had a significant impact on Black Americans.…

  5. A School in Change.

    Science.gov (United States)

    Wilmore, Elaine L.

    This paper describes how a predominantly white elementary school responded to a school-district reorganization effort to promote ethnic balance among the schools. The redistricting plan reassigned some former students to other schools and bused in many Spanish-speaking students. The school staff encountered language problems with the new students…

  6. Letter to the Editor: Electric Vehicle Demand Model for Load Flow Studies

    DEFF Research Database (Denmark)

    Garcia-Valle, Rodrigo; Vlachogiannis, Ioannis (John)

    2009-01-01

    This paper introduces specific and simple model for electric vehicles suitable for load flow studies. The electric vehicles demand system is modelled as PQ bus with stochastic characteristics based on the concept of queuing theory. All appropriate variables of stochastic PQ buses are given with c...

  7. Tertiary control of voltage unbalance compensation for optimal power quality in islanded microgrids

    DEFF Research Database (Denmark)

    Meng, Lexuan; Tang, Fen; Savaghebi, Mehdi

    2016-01-01

    DG considering the voltage unbalance limits in local buses and DG terminals. This method realizes multi-power-quality-level control in a multi-bus islanded system by optimally utilizing DGs as distributed compensators and saves the investment for additional compensation equipment. Hardware-in...

  8. WEEKLY WATCH

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    OPINION School Buses The school bus crash that killed 64 children in northwest China’s Gansu Province has shaken the whole country.Learning from the tragic lesson,some local governments finally decided to change the situation.The local government of Gansu’s Qingyang City decided to cancel

  9. Development of A Hydraulic Drive for a novel Diesel-Hydraulic system for Large commercial Vehicles

    DEFF Research Database (Denmark)

    Stecki, J. S.; Conrad, Finn; Matheson, P.;

    2002-01-01

    The objectives and results of the research project Hybrid Diesel-Hydraulic System for Large commercial vehicles, e.g. urban freight delivery, buses or garbage trucks. The paper presents and discusses the research and development of the system, modelling approach and results from preliminary...

  10. Empirical analysis of heterogeneous traffic flow

    NARCIS (Netherlands)

    Ambarwati, L.; Pel, A.J.; Verhaeghe, R.J.; Van Arem, B.

    2013-01-01

    Traffic flow in many developing countries is strongly mixed comprising vehicle types, such as motorcycles, cars, (mini) buses, and trucks; furthermore, traffic flow typically exhibits free inter-lane exchanges. This phenomenon causes a complex vehicle interaction, rendering most existing traffic flo

  11. Bullying on the School Bus: A Video Analysis

    Science.gov (United States)

    Raskauskas, Juliana

    2005-01-01

    The purpose of this study was to assess the nature of bullying on the school bus. Videotapes were used to identify occurrences of bullying on buses of elementary school students. Incidents were reviewed for forms of bullying, fullness, presence of friends, and severity of acts. Results indicated that approximately two incidents occurred per bus…

  12. Settle for Segregation or Strive for Diversity? A Defining Moment for Maryland's Public Schools

    Science.gov (United States)

    Ayscue, Jennifer B.

    2013-01-01

    Maryland, as one of 17 states that had de jure segregation, has an intense history of school segregation. Following the 1954 Brown decision, school districts across the state employed various methods to desegregate their schools, including mandatory busing in Prince George's County, magnet schools in Montgomery County, and a freedom of choice plan…

  13. Using Virtual Environments for Teaching Social Understanding to 6 Adolescents with Autistic Spectrum Disorders

    Science.gov (United States)

    Mitchell, Peter; Parsons, Sarah; Leonard, Anne

    2007-01-01

    Six teenagers with Autistic Spectrum Disorders (ASDs) experienced a Virtual Environment (VE) of a cafe. They also watched three sets of videos of real cafe and buses and judged where they would sit and explained why. Half of the participants received their VE experience between the first and second sets of videos, and half experienced it between…

  14. MIL-STD-2411-1 Change 3. Notice Impacts to NAVAIR

    Science.gov (United States)

    2010-07-30

    2010 Memorandum Report Naval Air Systems Command Tactical Aircraft Moving Map Program PMA-209 47123 Buse Road IPT Patuxent River , MD 20670-1547 74...Guinea-Bissau) BOO Bogota Observatory (Colombia) BUR Bukit Rimpah (Bangka and Belitum Islands, Indonesia) CAZ Camp Area Astro (Camp McMurdo Area

  15. 78 FR 65155 - Special Conditions: Learjet Model 45 Series Airplanes; Isolation or Security Protection of the...

    Science.gov (United States)

    2013-10-31

    ... actions as more widely used commercial operating systems, such as Microsoft Windows NT, because access to... material did not anticipate this type of system architecture or electronic access to aircraft systems... security vulnerabilities, which could be caused by unauthorized access to aircraft data buses and...

  16. 78 FR 79560 - Buy America Waiver Notification

    Science.gov (United States)

    2013-12-30

    ... predominantly steel and iron product that is permanently incorporated into a project must be domestically... steel and iron content for the 112 State requests regarding specific vehicle projects (including sedans... requests regarding specific vehicle projects (including sedans, vans, pickups, SUVs, trucks, buses,...

  17. 77 FR 20308 - Approval and Promulgation of Implementations Plans; California Air Resources Board-In-Use Heavy...

    Science.gov (United States)

    2012-04-04

    ... mortality, aggravation of respiratory and cardiovascular disease, decreased lung function, visibility..., and to publicly and privately owned school buses, that have a manufacturer's gross vehicle weight... also applies to owners and operators of motor carriers that dispatch drayage trucks that operate...

  18. 49 CFR 393.93 - Seats, seat belt assemblies, and seat belt assembly anchorages.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 5 2010-10-01 2010-10-01 false Seats, seat belt assemblies, and seat belt... § 393.93 Seats, seat belt assemblies, and seat belt assembly anchorages. (a) Buses—(1) Buses... the driver's seat and seat belt assembly anchorages that conform to the location and...

  19. Seat Belts Don't Save Lives; Trained Drivers and Safe Vehicles Do.

    Science.gov (United States)

    Bernard, Roscoe

    1983-01-01

    Presents five arguments against requiring seat belts on school buses, including the need for better trained drivers, the danger that students will be trapped by seat belts in emergencies, and other problems relating to practicality and cost. Included is an editorial insert indicating how safety advocates respond to such objections. (JBM)

  20. Elimination of zero sequence circulating current between parallel operating three-level inverters

    DEFF Research Database (Denmark)

    Li, Kai; Wang, Xiaodong; Dong, Zhenhua;

    2016-01-01

    In order to suppress the zero sequence circulating currents (ZSCCs) between parallel operating three level voltage source inverters with common AC and DC buses, a common mode voltage reduction PWM (CMVR-PWM) technique and neural point potentials (NPPs) control based method is proposed in this paper...

  1. Challenges to the execution of the Euro III/IV emissions standards and proposals

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    As widely known, execution of the Euro III/ IV emissions standards involve two critical matters: OBD techniques and active vehicles in line with the requirements (similar to the recall system in the US). For heavy duty trucks and buses, Euro III requires engine

  2. 49 CFR 571.222 - Standard No. 222; School bus passenger seating and crash protection.

    Science.gov (United States)

    2010-10-01

    .... S3. Application. This standard applies to school buses. S4. Definitions. Contactable surface means... 5 seconds. S5.1.6Quasi-static test of compartmentalization and Type 2 seat belt performance. This... belt anchor point specified by S4.1.3.2(a) of Standard No. 210 (49 CFR 571.210) and Φ is the angle...

  3. A robustness metric for cascading failures by targeted attacks in power networks

    NARCIS (Netherlands)

    Koc, Y.; Warnier, M.; Kooij, R.E.; Brazier, F.M.T.

    2013-01-01

    Cascading failures are the main reason blackouts occur in power networks. The economic cost of such failures is in the order of tens of billion dollars annually. In a power network, the cascading failure phenomenon is related to both topological properties (number and types of buses, density of tran

  4. An entropy-based metric to quantify the robustness of power grids against cascading failures

    NARCIS (Netherlands)

    Koç, Y.; Warnier, M.; Kooij, R.E.; Brazier, F.M.T.

    2013-01-01

    The cascading failure phenomenon in a power grid is related to both the structural aspects (number and types of buses, density of transmission lines and interconnection of components), and the operative state (flow distribution and demand level). Existing studies most often focus on structural aspec

  5. Early Prediction of Transient Voltage Sags caused by Rotor Swings

    DEFF Research Database (Denmark)

    Weckesser, Johannes Tilman Gabriel; Jóhannsson, Hjörtur; Van Cutsem, Thierry

    2014-01-01

    The paper investigates various methods to predict voltage sags at load buses caused by large generator rotor swings and following a transient disturbance. Three different prediction methods are proposed, which all use real-time measurements from PMUs. One of the methods uses a slightly extended v...

  6. Report on preliminary study for promoting joint implementation in fiscal 1999. Feasibility study on introduction of dual mode bus system for reducing greenhouse effect gases in Malaysia

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2000-03-01

    In order to discuss the possibility of adoption as the COP3 clean development mechanism, discussions were given in fiscal 1999 on the dual mode bus system (DMBS) in Malaysia. The DMBS combines the advantages of the track system such as monorails and the road system such as buses. On the dedicated roads, the DMBS forms ranks of buses which travel automatically. On ordinary roads, the ranks are separated into independent buses to cover an area in terms of a plane, with buses travelling for their respective destinations. Reduction in air resistance because of travelling at economic speeds and in ranks can save fuel and reduce CO2 emission. The DMBS can work effectively also in forming complementary relationship with the existing public transportation systems. Two routes have been set in the urban area of Kuala Lumpur, and discussions were given on the new town of Putra Jaya as the object. From the viewpoint of financial internal profitability, the possibility of establishing the system as a private business is low if it relies only on income from ticket sales because of high initial cost including development of infrastructures. The effects of CO2 reduction and energy conservation, and economic benefits would be brought about from the viewpoint of modal shift from privately owned automobiles to public transportation systems. (NEDO)

  7. Addendum: Tenth International Symposium on Alcohol Fuels, The road to commercialization

    Energy Technology Data Exchange (ETDEWEB)

    1994-05-01

    The Tenth International Symposium on ALCOHOL FUELS ``THE ROAD TO COMMERCIALIZATION`` was held at the Broadmoor Hotel, Colorado Springs, Colorado, USA November 7--10, 1993. Twenty-seven papers on the production of alcohol fuels, specifications, their use in automobiles, buses and trucks, emission control, and government policies were presented. Individual papers have been processed separately for entry into the data base.

  8. 77 FR 75402 - Airworthiness Directives; The Boeing Company Airplanes

    Science.gov (United States)

    2012-12-20

    ... discharge of the main battery, which could result in multiple system degradation, reduced airplane... corrected, could result in discharge of the main battery, which could result in multiple system degradation... ``BAT'' position, isolating the battery and standby buses, disabling the battery charger, and...

  9. Acoustic Investigations into the Later Acquisition of Syllabic "-es" Plurals

    Science.gov (United States)

    Mealings, Kiri T.; Cox. Felicity; Demuth, Katherine

    2013-01-01

    Purpose: Children acquire /-ez/ syllabic plurals (e.g., buses) later than /-s, -z/ segmental plurals (e.g., cats,dogs). In this study, the authors explored whether increased syllable number or segmental factors best explains poorer performance with syllabic plurals. Method: An elicited imitation experiment was conducted with 14 two-year-olds…

  10. The Problem of Population

    Institute of Scientific and Technical Information of China (English)

    刘香情; 钱丹

    2002-01-01

    With the population growing, a lot of problems have come out, Nowadays a lot of tall buildings have been built, but the houses are still very short; A lot of cars and buses have increased, but they are still crowded with people; A lot of schools have been built,

  11. Architecture Analysis with AADL: The Speed Regulation Case-Study

    Science.gov (United States)

    2014-11-01

    inter-connected with two buses 25 Speed Regulation Case-Study Julien Delange © 2014 Carnegie Mellon University Architecture Alternative 1 50 MIPS 50 MIPS ...functions collocated on the same processor 26 Speed Regulation Case-Study Julien Delange © 2014 Carnegie Mellon University 50 MIPS 50 MIPS 50 MIPS Bandwidth

  12. 76 FR 68299 - Airworthiness Directives; Eurocopter Deutschland GmbH (ECD) Model MBB-BK 117 C-2 Helicopters

    Science.gov (United States)

    2011-11-04

    ... instructions for switching off the two main electrical buses (BUS TIEs) on the overhead panel to prevent the... one generator is deactivated, loss of electrical power, loss of systems necessary for flight safety... generator, likely resulting in loss of electrical power and inducing loss of systems that are necessary...

  13. Women's Relationship to Feminism: Effects of Generation and Feminist Self-Labeling

    Science.gov (United States)

    Duncan, Lauren E.

    2010-01-01

    The relative importance to feminism of generation and feminist self-labeling was explored in a sample of 667 women riding buses to a 1992 March on Washington for Reproductive Rights. Specifically, generational (Generation X vs. Baby Boomers) and feminist self-labeling (strong feminists vs. weak feminists vs. nonfeminists) similarities and…

  14. Efficacy of bus service reorganization utilizing a hub-and-spoke topology and DRT to meet community needs: A case study of Tokigawa town

    Directory of Open Access Journals (Sweden)

    Masaru Yajima

    2013-07-01

    Also, by implementing a system to alternatively operate regular route buses and DRT with a fixed schedule and area for routes in the mountain area, bus availability for residents living in low traffic areas was successfully increased due to increased efficiencies.

  15. Getting to School Safely

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    A deadly crash sparks a nationwide call for special school buses After a deadly traffic accident in north west China’s Gansu Province killed 19 preschool children and two adults people are expressing their sadness at memorial websites and discussing how to make the children’s journeys to school safer.

  16. 45 CFR 1310.14 - Inspection of new vehicles at the time of delivery.

    Science.gov (United States)

    2010-10-01

    ... 45 Public Welfare 4 2010-10-01 2010-10-01 false Inspection of new vehicles at the time of delivery... Inspection of new vehicles at the time of delivery. Each agency providing transportation services must ensure that bid announcements for school buses and allowable alternate vehicles for use in...

  17. Vergelijkende analyse van ongevallen met zware voertuigen : een vergelijking tussen vrachtwagens en bussen, en personenauto's en bestelwagens.

    NARCIS (Netherlands)

    Tromp, J.P.M.

    1989-01-01

    The nature and extent of accidents with heavy vehicles: lorries and buses, is studied. From earlier reports (B 24553 and B 28157) a list is set up of problems which heavy vehicles in traffic can experience and which have caused accidents. This list of problems is the basis for the study described he

  18. Alternate Transportation Routes

    Science.gov (United States)

    Vogel, Carl

    2009-01-01

    Since last school year, the St. Lucie County (Florida) Public Schools reduced the number of buses it operates from 399 to 362, despite opening two new schools. Add in some other smart changes in policy, and the district lowered its annual transportation costs by more than $3 million over last year. Saving $3 million a year does not come easily,…

  19. Compressed natural gas bus safety: a quantitative risk assessment.

    Science.gov (United States)

    Chamberlain, Samuel; Modarres, Mohammad

    2005-04-01

    This study assesses the fire safety risks associated with compressed natural gas (CNG) vehicle systems, comprising primarily a typical school bus and supporting fuel infrastructure. The study determines the sensitivity of the results to variations in component failure rates and consequences of fire events. The components and subsystems that contribute most to fire safety risk are determined. Finally, the results are compared to fire risks of the present generation of diesel-fueled school buses. Direct computation of the safety risks associated with diesel-powered vehicles is possible because these are mature technologies for which historical performance data are available. Because of limited experience, fatal accident data for CNG bus fleets are minimal. Therefore, this study uses the probabilistic risk assessment (PRA) approach to model and predict fire safety risk of CNG buses. Generic failure data, engineering judgments, and assumptions are used in this study. This study predicts the mean fire fatality risk for typical CNG buses as approximately 0.23 fatalities per 100-million miles for all people involved, including bus passengers. The study estimates mean values of 0.16 fatalities per 100-million miles for bus passengers only. Based on historical data, diesel school bus mean fire fatality risk is 0.091 and 0.0007 per 100-million miles for all people and bus passengers, respectively. One can therefore conclude that CNG buses are more prone to fire fatality risk by 2.5 times that of diesel buses, with the bus passengers being more at risk by over two orders of magnitude. The study estimates a mean fire risk frequency of 2.2 x 10(-5) fatalities/bus per year. The 5% and 95% uncertainty bounds are 9.1 x 10(-6) and 4.0 x 10(-5), respectively. The risk result was found to be affected most by failure rates of pressure relief valves, CNG cylinders, and fuel piping.

  20. A Feeder-Bus Dispatch Planning Model for Emergency Evacuation in Urban Rail Transit Corridors

    Science.gov (United States)

    Wang, Yun; Yan, Xuedong; Zhou, Yu; Zhang, Wenyi

    2016-01-01

    The mobility of modern metropolises strongly relies on urban rail transit (URT) systems, and such a heavy dependence causes that even minor service interruptions would make the URT systems unsustainable. This study aims at optimally dispatching the ground feeder-bus to coordinate with the urban rails’ operation for eliminating the effect of unexpected service interruptions in URT corridors. A feeder-bus dispatch planning model was proposed for the collaborative optimization of URT and feeder-bus cooperation under emergency situations and minimizing the total evacuation cost of the feeder-buses. To solve the model, a concept of dummy feeder-bus system is proposed to transform the non-linear model into traditional linear programming (ILP) model, i.e., traditional transportation problem. The case study of Line #2 of Nanjing URT in China was adopted to illustrate the model application and sensitivity analyses of the key variables. The modeling results show that as the evacuation time window increases, the total evacuation cost as well as the number of dispatched feeder-buses decrease, and the dispatched feeder-buses need operate for more times along the feeder-bus line. The number of dispatched feeder-buses does not show an obvious change with the increase of parking spot capacity and time window, indicating that simply increasing the parking spot capacity would cause huge waste for the emergent bus utilization. When the unbalanced evacuation demand exists between stations, the more feeder-buses are needed. The method of this study will contribute to improving transportation emergency management and resource allocation for URT systems. PMID:27676179

  1. Efficient and Robust Data Collection Using Compact Micro Hardware, Distributed Bus Architectures and Optimizing Software

    Science.gov (United States)

    Chau, Savio; Vatan, Farrokh; Randolph, Vincent; Baroth, Edmund C.

    2006-01-01

    Future In-Space propulsion systems for exploration programs will invariably require data collection from a large number of sensors. Consider the sensors needed for monitoring several vehicle systems states of health, including the collection of structural health data, over a large area. This would include the fuel tanks, habitat structure, and science containment of systems required for Lunar, Mars, or deep space exploration. Such a system would consist of several hundred or even thousands of sensors. Conventional avionics system design will require these sensors to be connected to a few Remote Health Units (RHU), which are connected to robust, micro flight computers through a serial bus. This results in a large mass of cabling and unacceptable weight. This paper first gives a survey of several techniques that may reduce the cabling mass for sensors. These techniques can be categorized into four classes: power line communication, serial sensor buses, compound serial buses, and wireless network. The power line communication approach uses the power line to carry both power and data, so that the conventional data lines can be eliminated. The serial sensor bus approach reduces most of the cabling by connecting all the sensors with a single (or redundant) serial bus. Many standard buses for industrial control and sensor buses can support several hundreds of nodes, however, have not been space qualified. Conventional avionics serial buses such as the Mil-Std-1553B bus and IEEE 1394a are space qualified but can support only a limited number of nodes. The third approach is to combine avionics buses to increase their addressability. The reliability, EMI/EMC, and flight qualification issues of wireless networks have to be addressed. Several wireless networks such as the IEEE 802.11 and Ultra Wide Band are surveyed in this paper. The placement of sensors can also affect cable mass. Excessive sensors increase the number of cables unnecessarily. Insufficient number of sensors

  2. Some Protocols For Optical-Fiber Digital Communications

    Science.gov (United States)

    Yeh, Cavour; Gerla, Mario

    1989-01-01

    One works best in heavy traffic, another, in light traffic. Three protocols proposed for digital communications among stations connected by passive taps to pair of uni-directional optical-fiber buses. Mediate round-robin, bounded-delay access to buses by all stations and particularly suited to fast transmission. Partly because transmission medium passive (no relay stations) and partly because protocols distribute control of network among all stations with provision for addition and deletion of stations (no control stations), communication network able to resist and recover from failures. Implicit token propagates in one direction on one bus and in opposite direction on other bus, minimizing interval of silence between end of one round and beginning of next.

  3. Modeling and Experimental Study of PEM Fuel Cell Transient Response for Automotive Applications

    Institute of Scientific and Technical Information of China (English)

    HUA Jianfeng; XU Liangfei; LIN Xinfan; LU Languang; OUYANG Minggao

    2009-01-01

    This paper presents an analysis of the dynamic response of a low pressure proton exchange membrane (PEM) fuel cell stack to step changes in load, which are characteristic of automotive fuel cell system applications. The goal is a better understanding of the electrical and electrochemical processes when accounting for the characteristic cell voltage response during transients. The analysis and experiment are based on a low pressure 5 kW proton exchange membrane fuel cell (PEMFC) stack, which is similar to those used in several of Tsinghua's fuel cell buses. The experimental results provide an effective improvement reference for the power train control scheme of the fuel cell buses in Olympic demonstration in Beijing 2008.

  4. HYDROGEN COMMERCIALIZATION: TRANSPORTATION FUEL FOR THE 21ST CENTURY

    Energy Technology Data Exchange (ETDEWEB)

    APOLONIO DEL TORO

    2008-05-27

    Since 1999, SunLine Transit Agency has worked with the U.S. Department of Energy (DOE), U.S. Department of Defense (DOD), and the U.S. Department of Transportation (DOT) to develop and test hydrogen infrastructure, fuel cell buses, a heavy-duty fuel cell truck, a fuel cell neighborhood electric vehicle, fuel cell golf carts and internal combustion engine buses operating on a mixture of hydrogen and compressed natural gas (CNG). SunLine has cultivated a rich history of testing and demonstrating equipment for leading industry manufacturers in a pre-commercial environment. Visitors to SunLine's "Clean Fuels Mall" from around the world have included government delegations and agencies, international journalists and media, industry leaders and experts and environmental and educational groups.

  5. 城市公交车制动能量回收方式综述%An overview of Recovery Mode of Urban Bus Braking Energy

    Institute of Scientific and Technical Information of China (English)

    秦瑞; 王文竹; 石磊

    2015-01-01

    Based on the analysis of the running of urban bus , this paper explained the necessity of energy recovery system of urban buses. It analyzed the structure and principle of three kinds of braking energy recovery mode analyzed and comparedthe application of the three brake energy recovery systems in urban buses i.%文章在分析城市公交车运行工况的基础上,说明了城市公交车能量回收系统的必要性。分析了三种制动能量回收方式的结构原理,对三种制动能量回收系统在城市公交车上的应用进行了分析比较。

  6. General purpose fast decoupled power flow

    Energy Technology Data Exchange (ETDEWEB)

    Nanda, J.; Bijwe, P.R.; Henry, J.; Bapi Raju, V. (Indian Inst. of Tech., New Delhi (IN). Dept. of Electrical Engineering)

    1992-03-01

    A general purpose fast decoupled power flow model (GFDPF) is presented that exhibits more or less best convergence properties for both well-behaved and ill-conditioned systems. In the proposed model, all network shunts such as line charging, external shunts at buses, shunts formed due to {pi} representation of off-nominal in-phase transformers etc. are treated as constant impedance loads. The effect of line resistances is considered while forming the (B') matrix and are ignored in forming the (B'') matrix. This model is tested on several systems for both well-behaved and ill-conditioned situations. A simple, efficient compensation technique is proposed to deal with Q-limit enforcements associated with bus-type switchings at voltage-controlled buses. The results demonstrate that the proposed GFDPF model exhibits more or less stable convergence behaviour for both well-behaved and ill-conditioned situations. (author).

  7. The scalable coherent interface, IEEE P1596, status and possible applications to data acquisition and physics

    Energy Technology Data Exchange (ETDEWEB)

    Gustavson, D.B.

    1990-01-01

    IEEE P1596, the Scalable Coherent Interface (formerly known as SuperBus) is based on experience gained while developing Fastbus (ANSI/IEEE 960-1986, IEC 935), Futurebus (IEEE P896.x) and other modern 32-bit buses. SCI goals include a minimum bandwidth of 1 GByte/sec per processor in multiprocessor systems with thousands of processors; efficient support of a coherent distributed-cache image of distributed shared memory; support for repeaters which interface to existing or future buses; and support for inexpensive small rings as well as for general switched interconnections like Banyan, Omega, or crossbar networks. This paper presents a summary of current directions, reports the status of the work in progress, and suggests some applications in data acquisition and physics. 7 refs.

  8. Martin Luther King Day

    Institute of Scientific and Technical Information of China (English)

    邵有为

    2005-01-01

    @@ It was December, 1955, and Martin Luther King, Jr. had just received his doctorate3 degree in theology4. He had moved to Montgomery, Alabama to preach5 at a Baptist church. He saw there, as in many other southern states, that African-Americans had to ride in the back of public buses. Dr. King knew that this law violated6 the rights of every African-American. He organized and led a boycott7 of the public buses in the city of Montgomery. Any person, black or white, who was against segregation8 refused to use public transportation. Those people who boycotted were threatened or attacked by other people, or even arrested or jailed by the police. After one year of boycotting the bus system, the Supreme Court9declared that the Alabama state segregation law was unconstitutional10.

  9. Statistics of voltage drop in distribution circuits: a dynamic programming approach

    Energy Technology Data Exchange (ETDEWEB)

    Turitsyn, Konstantin S [Los Alamos National Laboratory

    2010-01-01

    We analyze a power distribution line with high penetration of distributed generation and strong variations of power consumption and generation levels. In the presence of uncertainty the statistical description of the system is required to assess the risks of power outages. In order to find the probability of exceeding the constraints for voltage levels we introduce the probability distribution of maximal voltage drop and propose an algorithm for finding this distribution. The algorithm is based on the assumption of random but statistically independent distribution of loads on buses. Linear complexity in the number of buses is achieved through the dynamic programming technique. We illustrate the performance of the algorithm by analyzing a simple 4-bus system with high variations of load levels.

  10. Effects of Photovoltaic and Fuel Cell Hybrid System on Distribution Network Considering the Voltage Limits

    Directory of Open Access Journals (Sweden)

    ABYANEH, H. A.

    2010-11-01

    Full Text Available Development of distribution network and power consumption growth, increase voltage drop on the line impedance and therefore voltage drop in system buses. In some cases consumption is so high that voltage in some buses exceed from standard. In this paper, effect of the fuel cell and photovoltaic hybrid system on distribution network for solving expressed problem is studied. For determining the capacity of each distributed generation source, voltage limitation on the bus voltages under different conditions is considered. Simulation is done by using DIgSILENT software on the part of the 20 kV real life Sirjan distribution system. In this article, optimum location with regard to system and environmental conditions are studied in two different viewpoints.

  11. Power Efficient Hierarchical Scheduling for DSP Transformations

    Directory of Open Access Journals (Sweden)

    P. K. Merakos

    2002-01-01

    Full Text Available In this paper, the problem of scheduling the computation of partial products in transformational Digital Signal Processing (DSP algorithms, aiming at the minimization of the switching activity in data and address buses, is addressed. The problem is stated as a hierarchical scheduling problem. Two different optimization algorithms, which are based on the Travelling Salesman Problem (TSP, are defined. The proposed optimization algorithms are independent on the target architecture and can be adapted to take into account it. Experimental results obtained from the application of the proposed algorithms in various widely used DSP transformations, like Discrete Cosine Transform (DCT and Discrete Fourier Transform (DFT, show that significant switching activity savings in data and address buses can be achieved, resulting in corresponding power savings. In addition, the differences between the two proposed methods are underlined, providing envisage for their suitable selection for implementation, in particular transformational algorithms and architectures.

  12. A Universal Portable Appliance for Stellarator W7-X Power Supply Controlling

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    In the project Wendelstein 7-X (W7-X), the popular fieldbus Profibus has been determined as a uniform connection between the central control system and all the subordinate systems. A universal embedded control system has been developed for W7-X power supply con trolling. Siemens 80C167CR microcontroller is used as the central control unit of the system. With a user-defined printed circuit board (PCB) several control buses, i.e., Profibus, CAN, IEEE 488, RS485 and RS 232 have been connected to the microcontroller. The corresponding hardware interfaces for the control buses have been designed. A graphic liquid crystal display(LCD) and a user-defined keyboard are used as user interface. The control software will be developed with a C-like language, i.e., C166 for the controller.

  13. Distributed Estimation and False Data Detection with Application to Power Networks

    CERN Document Server

    Pasqualetti, Fabio; Bullo, Francesco

    2011-01-01

    This work presents a distributed method for control centers in a power network to estimate the operating condition of the power plant, and to ultimately determine the occurrence of threatening situations. State estimation has been recognized to be a fundamental task for network control centers to ensure correct and safe functionalities of power grids. We consider (static) state estimation problems, in which the state vector consists of the voltage magnitude and angle at all network buses. We consider the state to be linearly related to network measurements, which include power flows, current injections, and voltages phasors at some buses. We admit the presence of several cooperating control centers, and we design two distributed methods for them to compute the minimum variance estimate of the state given the network measurements. The two distributed methods rely on different modes of cooperation among control centers: in the first method an incremental mode of cooperation is used, whereas, in the second metho...

  14. Theoretical Modeling and Simulation of Phase-Locked Loop (PLL) for Clock Data Recovery (CDR)

    CERN Document Server

    Ashari, Zainab

    2012-01-01

    Modern communication and computer systems require rapid (Gbps), efficient and large bandwidth data transfers. Agressive scaling of digital integrated systems allow buses and communication controller circuits to be integrated with the microprocessor on the same chip. The Peripheral Component Interconnect Express (PCIe) protocol handles all communcation between the central processing unit (CPU) and hardware devices. PCIe buses require efficient clock data recovery circuits (CDR) to recover clock signals embedded in data during transmission. This paper describes the theoretical modeling and simulation of a phase-locked loop (PLL) used in a CDR circuit. A simple PLL architecture for a 5 GHz CDR circuit is proposed and elaborated in this work. Simulations were carried out using a Hardware Description Language, Verilog- AMS. The effect of jitter on the proposed design is also simulated and evaluated in this work. It was found that the proposed design is robust against both input and VCO jitter.

  15. Assessing the Predictability of Scheduled-Vehicle Travel Times

    DEFF Research Database (Denmark)

    Tiesyte, Dalia; Jensen, Christian Søndergaard

    2009-01-01

    One of the most desired and challenging services in collective transport systems is the real-time prediction of the near-future travel times of scheduled vehicles, especially public buses, thus improving the experience of the transportation users, who may be able to better schedule their travel...... of travel times with the actual prediction errors for real bus trajectories. We have applied the proposed framework to real-time data collected from buses operating in Copenhagen, Denmark......., and also enabling system operators to perform real-time monitoring. While travel-time prediction has been researched extensively during the past decade, the accuracies of existing techniques fall short of what is desired, and proposed mathematical prediction models are often not transferable to other...

  16. Travel Time Estimation and Prediction using Mobile Phones: A Cost Effective Method for Developing Countries

    Directory of Open Access Journals (Sweden)

    Satyakumar, M.

    2014-01-01

    Full Text Available Conventional data collection methods lack real time information and involve excessive cost of installation and maintenance. A real-time, low cost travel time data collection system can be developed using mobile phones. This project examines the use of mobile phones for travel time prediction of public transit vehicles and develops a dynamic travel time prediction model. Personnel were employed in public transit vehicles with mobile phones and these mobile phones were tracked continuously. Space information of the mobile phones represents the position of the buses and movement pattern of these mobile phones in turn represents the movement pattern of the public buses. The starting and arrival time at sections obtained from the cellular database were used to get the travel time and speed. Results obtained were statistically significant and it shows that use of mobile phone for travel time data collection is a low cost data collection technique for Indian cities.

  17. Operation and Control of Grid Connected Hybrid AC/DC Microgrid using various RES

    Directory of Open Access Journals (Sweden)

    Kodanda Ram R B P U S B

    2014-10-01

    Full Text Available This paper proposes a Hybrid AC/DC Microgrid in alliance with Photo Voltaic (PV energy, Wind Energy and Proton Exchange Membrane (PEM Fuel cells. Microgrids are becoming increasingly attractive to the researchers because of the less greenhouse gases, low running cost, and flexibility to operate in connection with utility grid. The Hybrid AC/DC Microgrid constitutes independent AC and DC subgrids, where all the corresponding sources and loads are connected to their respective buses and these buses are interfaced using an interfacing converter. The Hybrid AC/DC Microgrid increases system efficiency by reducing the multiple reverse conversions involved in conventional RES integration to grid. A Small Hybrid AC/DC Microgrid in grid connected mode was modeled and simulated in MATLAB-SIMULINK environment. The simulation results proves the stable operation considering the uncertainty of generations and loads.

  18. DC-DC power converter research for Orbiter/Station power exchange

    Science.gov (United States)

    Ehsani, M.

    1993-01-01

    This project was to produce innovative DC-DC power converter concepts which are appropriate for the power exchange between the Orbiter and the Space Station Freedom (SSF). The new converters must interface three regulated power buses on SSF, which are at different voltages, with three fuel cell power buses on the Orbiter which can be at different voltages and should be tracked independently. Power exchange is to be bi-directional between the SSF and the Orbiter. The new converters must satisfy the above operational requirements with better weight, volume, efficiency, and reliability than is available from the present conventional technology. Two families of zero current DC-DC converters were developed and successfully adapted to this application. Most of the converters developed are new and are presented.

  19. Hierarchical message bus-based software architectural style

    Institute of Scientific and Technical Information of China (English)

    张世琨; 王立福; 杨芙清

    2002-01-01

    As the size and complexity of software systems increase,the design and specification of overall system structure become more significant issues than the choice of algorithms and data structures of computation.An appropriate architecture for a system is a key element of its success.Based on the practice of Jadebird software production line,this paper proposes a software architectural style based on hierarchical message buses,named JB/HMB.In this style,the component model consists of external interfaces,static structure and dynamic behavior,which depicts a component from different aspects.Supported by message buses,components interact with one another by messages,which can be used to describe distributed and concurrent systems well.JB/HMB style supports stepwise decomposition and refinement,and runtime system evolution.Finally,characteristics of JB/HMB style are summarized as a conclusion,and future research directions are specified.``

  20. A Feed-Forward Control Realizing Fast Response for Three-Branch Interleaved DC-DC Converter in DC Microgrid

    DEFF Research Database (Denmark)

    Wang, Haojie; Han, Minxiao; Yan, Wenli

    2016-01-01

    It is a common practice for storage batteries to be connected to DC microgrid buses through DC-DC converters for voltage support on islanded operation mode. A feed-forward control based dual-loop constant voltage PI control for three-branch interleaved DC-DC converters (TIDC) is proposed for stor......It is a common practice for storage batteries to be connected to DC microgrid buses through DC-DC converters for voltage support on islanded operation mode. A feed-forward control based dual-loop constant voltage PI control for three-branch interleaved DC-DC converters (TIDC) is proposed...... for storage batteries in DC microgrids. The working principle of TIDC is analyzed, and the factors influencing the response rate based on the dual-loop constant voltage control for TIDC are discussed, and then the method of feed-forward control for TIDC is studied to improve the response rate for load...

  1. Development of KURAMA-II and its operation in Fukushima

    Energy Technology Data Exchange (ETDEWEB)

    Tanigaki, M., E-mail: tanigaki@rri.kyoto-u.ac.jp; Okumura, R.; Takamiya, K.; Sato, N.; Yoshino, H.; Yoshinaga, H.; Kobayashi, Y.; Uehara, A.; Yamana, H.

    2015-05-01

    A carborne survey system, named as KURAMA (Kyoto University RAdiation MApping system), was developed as a response to the nuclear accident at TEPCO Fukushima Daiichi Nuclear Power Plant in 2011. Now the system has evolved into KURAMA-II, characterized by its compactness, autonomous operation, and acquisition of pulse-height spectrum data. A two-year field test of radiation monitoring by KURAMA-II on local buses, performed by Kyoto University, has successfully proceeded to the phase of official operation by the Fukushima prefectural government, supported by Kyoto University and JAEA (Japan Atomic Energy Agency). An outline and the current status of KURAMA-II, including some results of the continuous monitoring by KURAMA-II on local buses in Fukushima, are introduced.

  2. Fabrication of a high-density MCM-D for a pixel detector system using a BCB/Cu technology

    CERN Document Server

    Topper, M; Engelmann, G; Fehlberg, S; Gerlach, P; Wolf, J; Ehrmann, O; Becks, K H; Reichl, H

    1999-01-01

    The MCM-D which is described here is a prototype for a pixel detector system for the planned Large Hadron Collider (LHC) at CERN, Geneva. The project is within the ATLAS experiment. The module consists of a sensor tile with an active area of 16.4 mm*60.4 mm, 16 readout chips, each serving 24*160 pixel unit cells, a module controller chip, an optical transceiver and the local signal interconnection and power distribution buses. The extremely high wiring density which is necessary to interconnect the readout chips was achieved using a thin film copper/photo-BCB process above the pixel array. The bumping of the readout chips was done by PbSn electroplating. All dice are then attached by flip-chip assembly to the sensor diodes and the local buses. The focus of this paper is a detailed description of the technologies for the fabrication of this advanced MCM-D. (10 refs).

  3. A Novel Grid-Wide Transient Stability Assessment and Visualization Method for Increasing Situation Awareness of Control Room Operators

    DEFF Research Database (Denmark)

    Pertl, Michael; Rezkalla, Michel M.N.; Marinelli, Mattia

    2016-01-01

    The aim of the paper is to introduce a grid-wide assessment method to determine the transient stability margin and visualize it effectively to increase the situation awareness of control room operators. Critical area(s) with insufficient transient stability margin have to be identified in order...... to be able to take appropriate preventive actions. The introduced method evaluates the transient stability margin with a time-domain approach by using the voltage angle of several buses across the power system. Information about the severity of a contingency and the location of the most critical buses...... is derived. Moreover, it is shown that the method facilitates the visual examination of transient stability. It provides control room operators with essential information about the state of the system and enables them to take appropriate preventive actions if insufficient transient stability margins...

  4. Power Talk

    DEFF Research Database (Denmark)

    Angjelichinoski, Marko; Stefanovic, Cedomir; Popovski, Petar

    2016-01-01

    A standard way to realize communication in microgrid control is to use an external communication network, such as modems for wireless or power-line communication, whose implementation may be inefficient in terms of deployment cost, complexity, and system stability. In this chapter we present...... a communication solution, denoted as power talk, which is solely based on the use of the existing microgrid power equipment (i.e., power electronics and buses). The pivotal idea is to modulate information in the power-related parameters of the microgrid buses by use of the flexibility of power electronic...... interfaces. The focus of the chapter is on the design of power talk solutions for DC microgrids with droop control. Specifically, the chapter presents the power talk implementation through modification of the droop parameters of the primary control loop, and investigates the design of modulation schemes...

  5. High voltage systems (tube-type microwave)/low voltage system (solid-state microwave) power distribution

    Science.gov (United States)

    Nussberger, A. A.; Woodcock, G. R.

    1980-01-01

    SPS satellite power distribution systems are described. The reference Satellite Power System (SPS) concept utilizes high-voltage klystrons to convert the onboard satellite power from dc to RF for transmission to the ground receiving station. The solar array generates this required high voltage and the power is delivered to the klystrons through a power distribution subsystem. An array switching of solar cell submodules is used to maintain bus voltage regulation. Individual klystron dc voltage conversion is performed by centralized converters. The on-board data processing system performs the necessary switching of submodules to maintain voltage regulation. Electrical power output from the solar panels is fed via switch gears into feeder buses and then into main distribution buses to the antenna. Power also is distributed to batteries so that critical functions can be provided through solar eclipses.

  6. Application of Harmony Search to Vehicle Routing

    Directory of Open Access Journals (Sweden)

    Zong W.  Geem

    2005-01-01

    Full Text Available A phenomenon-inspired meta-heuristic algorithm, harmony search, imitating music improvisation process, is introduced and applied to vehicle routing problem, then compared with one of the popular evolutionary algorithms, genetic algorithm. The harmony search algorithm conceptualized a group of musicians together trying to search for better state of harmony. This algorithm was applied to a test traffic network composed of one bus depot, one school and ten bus stops with demand by commuting students. This school bus routing example is a multi-objective problem to minimize both the number of operating buses and the total travel time of all buses while satisfying bus capacity and time window constraints. Harmony search could find good solution within the reasonable amount of time and computation.

  7. Riding to School in a Wheelchair

    Science.gov (United States)

    Buning, Mary Ellen; Shutrump, Sue; Manary, Miriam A.

    2007-01-01

    Riding on a school bus is one of the safest forms of transportation in the U.S. Every year 450,000 public school buses travel more than 4.3 billion miles to transport 23.5 million children to and from school and school related activities. Students are reportedly eight times safer on the school bus than they are in cars. However, the percentage of…

  8. Infrared Thermography in Marine Applications

    OpenAIRE

    Pašagić, Vladimir; Mužević, Marijan; Kelenc, Dubravko

    2008-01-01

    Infrared (IR) thermography has become a powerful tool for basic and applied scientifi c research and for the application in various fi elds such as industry, environment, military and maritime affairs, etc. As a „predictive“ maintenance tool, IR thermography has the ability to identify problems before they occur. It is especially helpful for trouble shooting potential electrical overloads, worn or bad circuit breakers and buses. IR thermography can also be used to detect bad beari...

  9. Evaluation of the strengthening of the conditions of voltage security using sensitivity analysis; Avaliacao do reforco das condicoes da seguranca de tensao utilizando a analise de sensibilidade

    Energy Technology Data Exchange (ETDEWEB)

    Rosa, A.L.S.; Costa, V.M. da; Peres, W. [Universidade Federal de Juiz de Fora (UFJF), MG (Brazil). Faculdade de Engenharia], Emails: arleilucas@gmail.com, vander@lacee.ufjf.br, wesley.peres@yahoo.com.br; Prada, R.B. [Pontificia Universidade Catolica (PUC-Rio), Rio de Janeiro, RJ (Brazil). Dept. de Engenharia Eletrica], Email: prada@ele.puc-rio.br

    2009-07-01

    Voltage stability or voltage security analysis has motivated an expressive attention of power systems researchers. In this work, a simple and fast method evaluates voltage security and proposes conditions to improve the loading margin. System analysis is carried out in terms of active power transmission path. Sensitivity analysis provides the most adequate buses to active and reactive power redispatch. A sequential iterative methodology to reinforce system conditions is presented. (author)

  10. AAFES Gas Station at Creech Air Force Base Environmental Assessment

    Science.gov (United States)

    2009-07-01

    Reservation station. Nor was there any mention of carpooling or busing to relieve the costs of the commute. Should the project be carried forward...Indian Springs, as well as the intermediate station at the Snow Mountain Piute (sic) Reservation station. Nor was there any mention of carpooling or...meet the purpose and need for this action. A sizable percentage already arrives at Creech by bus or carpool . The purpose of this action is not

  11. ESTIMATION OF THE RUNNING COSTS OF AUTONOMOUS ENERGY SOURCES IN TROLLEYBUSES

    Directory of Open Access Journals (Sweden)

    Piotr Hołyszko

    2016-11-01

    Full Text Available The article analyses the performance characteristics and operating costs of the three types of trolley-buses equipped with alternative energy sources, which are used by the MPK (Municipal Transport Company in Lublin. The selected applications are adapted for driving off traction in emergency mode as well as servicing the regular route. Two of them are based on electrochemical batteries and one uses a system with an electric generator driven by an internal combustion engine.

  12. Analisis Penempatan Optimal Bank Kapasitor Pada Sistem Distribusi Radial Dengan Metode Genetik Algorithm Aplikasi: PT. PLN (Persero) Cabang Medan

    OpenAIRE

    Saragih, Tarsin

    2011-01-01

    With time development, the need for electricity is increasingly high. The amount of reactive power (Q) will result in a non-optimal power distribution, because a big apparent power (S) will be needed to serve the increasing active power (P). To optimize the consumption of electric power in radial distribution systems, the optimal bank capacitor can be placed as reactive power compensation. In radial distribution system, the reactive power compensation needed should be split into several buse...

  13. Defense Acquistion: Rationale for Imposing Domestic Source Restrictions.

    Science.gov (United States)

    2007-11-02

    retained the restriction for polyacrylonitrile-based carbon fiber, periscope tube forgings, bull gear ring forgings, and ship propulsion shaft...forgings 1984 Protect sensitive data Ship propulsion shaft forgings 1984 Unsettled conditions among suppliers In its reviews of industrial base... Ship Propulsion Shafts 14 14 15 16 17 Appendix III Rationale for 10 U.S.C. 2534-Imposed Restrictions Buses Chemical Weapons Antidote

  14. Optimization of tapered busses for solar cell contacts

    Science.gov (United States)

    Landis, G. A.

    1979-01-01

    Some fraction of the power produced by a solar cell is necessarily lost by series resistance associated with the metallized contact grid and by shadowing of cell active area by the grid. There are several approaches to reducing these losses, such as choosing a more efficient pattern, optimizing line spacing, and using tapered buses. The present paper analyzes tapered lines and derives from this analysis a theoretical lower bound to metallization power loss, independent of pattern chosen.

  15. Optimal placement of Phasor Measurement Units to Improve Parallel Power System Restoration

    OpenAIRE

    2011-01-01

    This paper proposes a new method for optimal placement of Phasor Measurement Units (PMUs) across the weak areas of the power system to monitor the status of the boundary buses during Parallel Power System Restoration (PPSR). The proposed PMU placement method is based on an Integer Linear Programming (ILP) methodology. For validation purposes, the proposed method is implemented across the weak areas of the following two test systems: New England 39-bus test system and IEEE 118-bus test system.

  16. Coûts environnementaux de transport routier et tarification d'usage des infrastructures (suivi du débat du 8 février 1994 auquel participaient M. Flinois, M. Gerondeau, M. Bonnafous, M. Josse, M. Walrave, M. Pignolet, M. Lapautre)

    OpenAIRE

    Bonnafous, Alain

    1994-01-01

    Road Tax and the Environmental Costs of Road Transport. – Environmental protection costs are analyzed in terms of noise, air pollution, and biosphere impact of four road vehicles in the open countryside : vans, trailer trucks, buses, and private cars.A first approximation shows that inaccuracies in the evaluations of these costs are due to uncertainties stemming both from the physical models and from economic origins (diversity of national standards).To these we should add the phenomena of sa...

  17. A Public Relations Model for the Department of Defense During Combat Contingencies

    Science.gov (United States)

    1990-11-01

    hostages held in the Mariott Hotel and were out of action the first 24 hours. Others could not move within the city because of the on-going 162...throughout much of their stay. He said that the reporters already present in Panama were holed up ih the Mariott Hotel and needed protection, transportation...registered at the Media Center and the majority stayed there because no hotels or restaurants were open. Additionally, rental cars, tax-is, buses or

  18. Car Delay Model near Bus Stops with Mixed Traffic Flow

    OpenAIRE

    Yang Xiaobao; Huan Mei; Gao Ziyou

    2013-01-01

    This paper proposes a model for estimating car delays at bus stops under mixed traffic using probability theory and queuing theory. The roadway is divided to serve motorized and nonmotorized traffic streams. Bus stops are located on the nonmotorized lanes. When buses dwell at the stop, they block the bicycles. Thus, two conflict points between car stream and other traffic stream are identified. The first conflict point occurs as bicycles merge to the motorized lane to avoid waiting behind the...

  19. Collection of Human Wastes on Long Missions

    Science.gov (United States)

    Jennings, D. C.; Lewis, T. A.; Brose, H. F.

    1986-01-01

    Report evaluates and compares three alternative approaches to hygienic containment of human wastes. Three practical means of waste collection: filter-bag collection with compaction by fan suction, canister collection with compaction by force applied to compaction cups or disks, and sleeve collection with compaction by rollers and winding on reel. Potentially useful in airplanes, buses, boats, trains, and campers and temporary toilets for construction sites and outdoor gatherings.

  20. Early Lessons Learned from DLA Hydrogen Demonstration Projects

    Science.gov (United States)

    2011-05-12

    Improve Manufacturing Readiness Levels (MRLs) for fuel cells and electrolyzers • “Green” hydrogen – reduced CO2 emissions Objectives: • “Green” H2...WORKFORCE DEVELOPMENT 0 500 1000 1500 2000 2500 3000 3500 4000 Fi lls /W ee k Air Products Count by Segment Cars /Buses Mat Handling 10/2008...reliability. • New humidifier design to increase humidifier life. • Design and manufacturing improvements for air compressor , reducing cost by ~10

  1. Transient stability of large scale system using efficient network reduction technique

    Energy Technology Data Exchange (ETDEWEB)

    Shenoy, D.L.; Belapurkar, R.K.; Raghavan, R.; Nanda, J.; Kothari, D.P.

    1981-12-01

    An efficient yet very simple technique incorporating Brown's axis discarding technique and optimal ordering of nodes for reducing a large scale power system has been described and its use in obtaining rapid transient stability solutions has been explained. The technique developed can also be used in short circuit analysis of a large power system when one is interested in finding out short circuit levels at a few buses in the system. 5 refs.

  2. Towards a sustainable automotive industry : experiences from the development of emission control systems

    OpenAIRE

    Bauner, David

    2007-01-01

    From the mid-1970s and on, the contribution to air pollution of carbon monoxide, hydrocarbons and nitrogen oxides from gasoline passenger cars in the developed world has been reduced through co-evolution of regulation and commercial introduction of catalytic emission control technology, now part of hundreds of millions of cars, trucks and buses worldwide. This dissertation is a disaggregated study of the global introduction of catalytic emission control technology as a measure to reduce local...

  3. 电能

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    An electronic universe,An Investigation of the Optical Characteristics of a Pulse Discharge in Argon at Atmospheric Pressure in an External Magnetic Field,Application of electric discharge process in joining aluminum and stainless steel sheets,Application of emergency and standby generation for distributed generation - Part 1 : concepts and hypotheses,evaluations,Application of emergency and standby generation for distributed generation - Part 2: experimental evaluations,Application of series hybrid power system based on actual driving data of urban buses.

  4. I.C.E.F.M. 94. Proceedings of the International Conference on Experimental Fluid Mechanics (2nd) Held in Torino, Italy on July 4-8, 1994,

    Science.gov (United States)

    1994-07-08

    body was towed by means of a monorail d.c. motor-operated towing system pro- vided with double-reduction gear, driving drum and infinite rope which...displacement transducers. Furthermore if the test chamber is below atmospheric pressure a plenum chamber for each flexible wall must be pro- vided in...Gilhaus - "The main parameters determining the aerodynamic drag of buses" - Proceedings of the Colloque " Construire avec le vent", Nantes, June 1981. (2

  5. COLD STORAGE-SUPPORTED AIR CONDITIONING SYSTEM IN URBAN TRANSPORT VEHICLES

    Directory of Open Access Journals (Sweden)

    Wojciech Jarzyna

    2016-11-01

    Full Text Available A bottleneck for the development of public transport vehicles is their electricity supply. Electric buses are almost exclusively equipped with electrochemical batteries, while nearly 40% of the energy is used in the processes of air conditioning. For this reason, we developed and built a demonstration system for storing thermal energy in public transport vehicles. The most important effects are: significant reduction of financial expenses and of the total weight of all batteries with the same amount of stored energy.

  6. Bus 54 -- Where are you? A school bus intelligent information system

    Energy Technology Data Exchange (ETDEWEB)

    Truett, L.F.; Moore, S.; Tonn, B. [Oak Ridge National Lab., TN (United States); Conley, T. [GTE Wireless, Nashville, TN (United States)

    1998-07-01

    Although major accidents involving school buses are rare (only about 0.3% of all fatal crashes since 1986 are classified as school-bus-related), even minor accidents and breakdowns cause a great deal of parental anxiety. The objective of this research is to design an efficient, cost-effective, accurate, and secure system that will track individual school buses and communicate appropriate information to the school system`s central administration unit, to the school transportation administrator, and to parents of children on the bus. The greatest benefit of the proposed information system is that parents and officials can always know the location and condition (these conditions would vary depending on the needs of a particular school system) of the school buses. In case of an accident or mechanical problem, when emergency crews are needed, they can be dispatched almost immediately with a good understanding of the problem and the exact location of the bus. In addition to being able to track the bus while the child is on board, parents will be able to determine the location of their child`s bus prior to its arrival in the morning in order to prevent the child from needing to wait outside in inclement weather. The information available to parents can also be expanded to include maps of limited routes (e.g., snow routes). Basically, the Bus 54 concept consists of a bus component and a central data processing unit. Each bus will be outfitted with a global positioning satellite (GPS) device, a wireless communication device, and wireless data communication service. The central data processing unit will receive and process information from the buses and provide information access to parents and officials via an Internet link.

  7. DDN (Defense Data Network) Protocol Handbook. Volume 2. DARPA Internet Protocols

    Science.gov (United States)

    1985-12-01

    Gateway Processes 29 5.2.1 Network Processes 29 5.2.2 QGP Process 30 5.2.3 HMP Process, . 31 APPENDIX A. GOP Message Formats 32 APPENDIX B...using QGP network interface status messages [Appendix A] to determine if the network interface is operational. The gateway has two rules relevant to...most recent routing update sent. -40- 2-568 HOST LEVEL: GATEWAY RFC 823 DARPA Internet Gateway September 1982 RFC 823 APPENDIX C. QGP Events

  8. Empirical testing of alternative price spread models in the South African maize market

    OpenAIRE

    Faminow, Merle D.; Laubscher, J. M.

    1991-01-01

    Reduced-form price spread models have been recently utilized by Wohlgenant and Mullen, and Thompson and Lyon to evaluate the economic factors affecting the marketing margins for agricultural products. Drawing on Gardner, Heien, Buse and Brandow, Waugh, Tomek and Robinson, and others they specify alternative retail-farm price spread models and attempt to determine which best fit the data in the context of underlying theoretical rationale. This paper continues in the spirit of Wohlgenant and Mu...

  9. MODELING OF PASSENGER TRANSPORTATIONS AND MANAGEMENT BY THE TRANSPORT RESOURCE OF ROUTING TAXI IN DIFFICULT SYSTEM OF THE MEGAPOLICY Моделирование пассажирских перевозок и управление транспортным ресурсом маршрутных такси в сложной системе мегаполиса

    Directory of Open Access Journals (Sweden)

    Volkov V. S.

    2012-03-01

    Full Text Available The variant of the decision of a task of management of a transport resource of buses is submitted on the basis of the current information on a condition of a route. The real speed of movement of transport, change of number of the passengers is taken into account. The considered task concerns to a class of extreme tasks on networks and is complicated by a set of restrictions

  10. Effects of Hydrogen Peroxide on Common Aviation Textiles

    Science.gov (United States)

    2009-08-01

    peroxide has been used for years as a disinfectant in the medical community and is under consideration in the dilute vapor form as a decontaminant... disinfectant /sterilant for transportation vehicles like aircraft, buses, subway trains, ambulances, etc. Although the biological efficacy of STERIS...10-min dip in 35% liquid H2O2 . 13 (a) (b) Figure 15. (a) Vertical and (b) horizontal flammability test results for nylon. 14 (a) (b) Figure 16. (a

  11. Stability Enhancement Based on Virtual Impedance for DC Microgrids with Constant Power Loads

    OpenAIRE

    Lu, Xiaonan; Sun, Kai; Guerrero, Josep M.; Quintero, Juan Carlos Vasquez; Huang, Lipei; Wang, Jianhui

    2015-01-01

    In this paper, a converter-based DC microgrid is studied. By considering the impact of each component in DC microgrids on system stability, a multi-stage configuration is employed, which includes the source stage, interface converter stage between buses and common load stage. In order to study the overall stability of the above DC microgrid with constant power loads (CPLs), a comprehensive small-signal model is derived by analyzing the interface converters in each stage. The instability issue...

  12. Military Review. Volume 81, Number 1, January-February 2001

    Science.gov (United States)

    2001-02-01

    and the President�s Summit. The latest leadership educa- tion and training materials have added staff rides and blocks of instruc- tion on etiquette ...education and training materials have added staff rides and blocks of instruction on etiquette , nutrition, conflict resolution, multicultural diversity...findings to the MND staff. As a precaution, the MND agreed to stage armored buses at the Norwegian -Polish bri- gade headquarters one hour south of

  13. The power processor of a high temperature superconducting energy storage system

    Energy Technology Data Exchange (ETDEWEB)

    Ollila, J. [Power Electronics, Tampere University of Technology, Tampere (Finland)

    1997-12-31

    This report introduces the structure and properties of a power processor unit for a high temperature superconducting magnetic energy storage system which is bused in an UPS demonstration application. The operation is first demonstrated using simulations. The software based operating and control system utilising combined Delta-Sigma and Sliding-Mode control is described shortly. Preliminary test results using a conventional NbTi superconducting energy y storage magnet operating at 4.2 K is shown. (orig.)

  14. 防抱死刹车系统

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    A Study on Chemical Resistance of PC/ABS Alloy for Instrument Panel;A study on safety design procedure for automotive active safety system;Anti-lock brake system control for buses based on fuzzy logic and a sliding-mode observer;Application of Fuzzy Control Algorithms for Electric Vehicle Antilock Braking/Traction Control Systems;Compatibilization of NYLON 6 nanocomposites/ABS blends using functionalized metallocene polyolefin elastomer……

  15. Assessment on the occupational exposure of urban public bus drivers to bioaccessible trace metals through resuspended fraction of settled bus dust

    Energy Technology Data Exchange (ETDEWEB)

    Gao, Peng [State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Nangang District, Harbin 150090 (China); Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003 (United States); Liu, Sa [Environmental Health Sciences Division, School of Public Health, University of California, Berkeley, CA, 94720-7360 (United States); Ye, Wenyuan [Department of Chemical Engineering, KU Leuven, Willem de Croylaan 46, B-3001 Heverlee (Belgium); Lin, Nan; Meng, Ping [State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Nangang District, Harbin 150090 (China); Feng, Yujie, E-mail: yujief@hit.edu.cn [State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Nangang District, Harbin 150090 (China); Zhang, Zhaohan; Cui, Fuyi; Lu, Binyu [State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Nangang District, Harbin 150090 (China); Xing, Baoshan [Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003 (United States)

    2015-03-01

    Limited information is available on the bioaccessible fraction of trace metals in the resuspended fraction of settled bus dust in order to estimate bus drivers ' occupational exposure. In this study, 45 resuspended fraction of settled dust samples were collected from gasoline and compressed natural gas (CNG) powered buses and analyzed for trace metals and their fraction concentrations using a three-step sequential extraction procedure. Experimental results showed that zinc (Zn) had the greatest bioaccessible fraction, recorded as an average of 608.53 mg/kg, followed in order of decreasing concentration by 129.80 mg/kg lead (Pb), 56.77 mg/kg copper (Cu), 34.03 mg/kg chromium (Cr), 22.05 mg/kg nickel (Ni), 13.17 mg/kg arsenic (As) and 2.77 mg/kg cadmium (Cd). Among the three settled bus dust exposure pathways, ingestion was the main route. Total exposure hazard index (HIt) for non-carcinogenic effect trace metals was lower than the safety level of 1. The incremental lifetime cancer risk (ILCR) for drivers was estimated for trace metal exposure. Pb and Ni presented relatively high potential risks in the non-carcinogenic and potentially carcinogenic health assessment for all drivers. ILCR was in the range of 1.84E − 05 to 7.37E − 05 and 1.74E − 05 to 6.95E − 05 for gasoline and CNG buses, respectively. - Highlights: • As, Cd and Ni had relatively higher bioaccessibility and mobility in the resuspended fraction of settled bus dust. • Bioaccessible metal concentrations were higher in gasoline-fueled buses than those in CNG-fueled buses. • The carcinogenic risk probabilities to drivers were around the acceptable level.

  16. JPRS Report China

    Science.gov (United States)

    2007-11-02

    English 0902 GMT 29 Nov 89 [Text] Beijing, November 29 (XINHUA)— Electrification of the Guiyang-Kunming railway line has been completed and will open...to traffic by the year-end, the Railways Ministry announced here today. Electrification of the line, which snakes 639 kilometers through the...TRANSPORTATION China Eastern Airlines Imports Air Buses [XINHUA] 25 Railway Minister Notes Slump in Passenger Transport [XINHUA] 25 Eastern Rail

  17. 奥运在即,伦敦人销声匿迹

    Institute of Scientific and Technical Information of China (English)

    Craig Taylor; 刘立胜(选注)

    2012-01-01

    Later this year, thousands of Olympians will march into London under flapping flags, and the global TV audience will be treated to a romanticized version of the city, with helicopter shots of Big Ben1 competing for time against footage2 of Buckingham Palace3 guards staring stone-faced4 into the unsteadily distance and double-deckel5 buses bouncing through too-narrow streets.

  18. Transports and environment; Transports et environnements

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2004-07-01

    In the framework of the greenhouse gases reduction, this study proposes many advices to control the fuel consumption of the vehicles and to change habits in the transportation sector. It presents also the alternatives to the pollutant today vehicles in the domain of the vehicles and buses fuels but also the new motors. Many Internet addresses are provided to complete the presentation. (A.L.B.)

  19. Particulate emissions from road transportation (gasoline and diesel). Chemical and granulometric characteristics; relative contribution; Emissions particulaires par les transports routiers (essence et diesel) caracteristiques chimiques et granulometriques contribution relative

    Energy Technology Data Exchange (ETDEWEB)

    Belot, G. [PSA-Peugiot-Citroen, 92 - La Garenne-Colombes (France)

    1996-12-31

    The formation process and chemical composition of diesel, leaded and lead-free gasoline combustion particulates are presented, and the effects of engine technology, post-treatments (oxidative catalysis), automobile speed and fuel type (more especially diesel type), on the granulometry of gasoline and diesel automotive particulates are studied. The emission contributions from the various diesel vehicle types (automobiles, trucks, buses), gasoline and diesel automobiles and other natural and anthropogenic particulate sources, are presented and compared

  20. Development of flywheel systems on the basis of mechatronics. Ontwikkeling van vliegwielsysteem mechatronisch aangepakt

    Energy Technology Data Exchange (ETDEWEB)

    De Boer, A.

    1992-05-01

    Vehicles can save energy by storing the brake energy in a flywheel. So far flywheels in toys appear to be the only efficient applications. The Centre for Construction and Mechatronics (CCM) in Nuenen, Netherlands, however, is developing a flywheel system for city buses: EMAFER or Electro Mechanical Accumulator For Energy Reuse. Based on experiences with the first prototype, constructed in 1988, a second prototype will be constructed and mounted in a bus to be tested. 1 fig., 2 ills., 2 tabs.

  1. Challenging the Grammar of Schooling: Individually Guided Education, 1969-1979

    OpenAIRE

    2012-01-01

    The late 1950s and the 1960s witnessed the emergence of a series of educational innovations, which can be divided into the following four categories. First, concerns for equality of opportunity led to efforts at achieving desegregation and the use of extensive busing for transporting students to consolidated schools and/or districts (Carlson, 1996; Pulliam & Patten, 1999). Second, the successful launch of Sputnik led American secondary schools to increase the number of courses in math, scienc...

  2. Carbon-Fiber/Epoxy Tube Lined With Aluminum Foil

    Science.gov (United States)

    Gernet, Nelson J.; Kerr, Gregory K.

    1995-01-01

    Carbon-fiber/epoxy composite tube lined with welded aluminum foil useful as part of lightweight heat pipe in which working fluid ammonia. Aluminum liner provides impermeability for vacuum seal, to contain ammonia in heat pipe, and to prevent flow of noncondensable gases into heat pipe. Similar composite-material tubes lined with foils also incorporated into radiators, single- and two-phase thermal buses, tanks for storage of cryogenic materials, and other plumbing required to be lightweight.

  3. Pneumatic brake control for precision stopping of heavy-duty vehicles

    OpenAIRE

    Bu, Fanping; Tan, Han-Shue

    2007-01-01

    Precision stopping is an important automated vehicle control function that is critical in applications such as precision bus docking, automated truck or bus fueling, as well as automatic intersection, or toll booth stopping. The initial applications of this technology are most likely to be applied to heavy-duty vehicles such as buses or trucks. Such applications require specific attention to brake control since the characteristics of a typical pneumatic brake system of a heavy vehicle is inhe...

  4. Natural Gas Basics

    Energy Technology Data Exchange (ETDEWEB)

    None

    2016-06-08

    Natural gas powers about 150,000 vehicles in the United States and roughly 22 million vehicles worldwide. Natural gas vehicles (NGVs) are a good choice for high-mileage fleets -- such as buses, taxis, and refuse vehicles -- that are centrally fueled or operate within a limited area or along a route with natural gas fueling stations. This brochure highlights the advantages of natural gas as an alternative fuel, including its domestic availability, established distribution network, relatively low cost, and emissions benefits.

  5. Natural Gas Basics

    Energy Technology Data Exchange (ETDEWEB)

    2016-06-01

    Natural gas powers about 150,000 vehicles in the United States and roughly 22 million vehicles worldwide. Natural gas vehicles (NGVs) are a good choice for high-mileage fleets -- such as buses, taxis, and refuse vehicles -- that are centrally fueled or operate within a limited area or along a route with natural gas fueling stations. This brochure highlights the advantages of natural gas as an alternative fuel, including its domestic availability, established distribution network, relatively low cost, and emissions benefits.

  6. Aspectos linguisticos del gamín bogotano

    Directory of Open Access Journals (Sweden)

    Carmen Ortega Ricaurte

    1968-05-01

    Full Text Available Se entiende por gamín el niño vago, sucio y abandonado que duerme en  los portales, deambula por las calles y aprovecha cualquier ocasión que se le presente para robar, pedir limosna, introducirse sin boleta a los espectáculos en donde hay aglomeraciones, viajar en la parte de atrás de los buses o carros, etc.

  7. TAN/LOFT 13. 8 KV, 2. 4 KV, and 480 V relay and circuit breaker coordination study

    Energy Technology Data Exchange (ETDEWEB)

    Burnett, J.E.

    1977-10-28

    Present overcurrent relay settings are presented and evaluated for adequacy in terms of the updated short circuit analysis. Recommendations are made for new relay and trip device settings to improve coordination. Switchgear ratings are examined against available short circuit currents, and recommendations are made where applicable. Vital MCC-A and B are examined in detail to provide maximum continuity of service for every fault contingency. A recommendation is made to improve the reliability of these buses.

  8. Designing a simple dynamic Digital Signage Network

    OpenAIRE

    Hagen, Andreas Ødegård

    2006-01-01

    Digital Signage Networks (DSN) is a continious emerging digital advertisment medium. Display devices, typically large format plasma or LCD screens, are used to provide rich multimedia advertisments in shops, buses, at airports and other public premises. Such networks have turned out to gain significant cost-effective advantages over traditional printed signage by eliminating the need for manual distribution. Animated graphics, audio and video effects makes a DSN highly suitable to attract the...

  9. Parallel Hybrid Vehicle Optimal Storage System

    Science.gov (United States)

    Bloomfield, Aaron P.

    2009-01-01

    A paper reports the results of a Hybrid Diesel Vehicle Project focused on a parallel hybrid configuration suitable for diesel-powered, medium-sized, commercial vehicles commonly used for parcel delivery and shuttle buses, as the missions of these types of vehicles require frequent stops. During these stops, electric hybridization can effectively recover the vehicle's kinetic energy during the deceleration, store it onboard, and then use that energy to assist in the subsequent acceleration.

  10. Hybrid Technologies for Clandestine Electric Reconnaissance Vehicles (CERV)

    Science.gov (United States)

    2011-08-01

    of other on board equipment. The OPC and high voltage Energy Storage system operate in concert with the Motor-Generator and Controller to form...the Vehicle DC Bus. When operating in PHEV mode from external power, the OPC provides power to the Vehicle DC Bus if either the Energy Storage System...commercial electric and hybrid buses. He has designed several motor drives including a 500 HP drive for sonar pulse power using a flywheel for energy

  11. Air quality on bus routes in Umea, Sweden

    Energy Technology Data Exchange (ETDEWEB)

    Sandberg, H.; Forsberg, B. [Dept. of Environmental Health and Dept. of Public Health and Clinical Medicine, Umea University SE, Umea (Sweden)

    2000-07-01

    Bus traffic in some local streets with up to 650 buses per day has resulted in complaints about air pollution and suggestions from residents that the bus routes should be changed to other streets. We have studied nitrogen dioxide and benzene concentrations at five exposed sites and at two representative control sites without bus traffic, and found no general differences in air quality. However, the site and temperature adjusted concentrations fell significantly during a strike among bus drivers. (authors)

  12. Space Station thermal test bed status and plans

    Science.gov (United States)

    Brady, Timothy K.

    1988-01-01

    The accomplishments, current status, and future plans of the thermal test bed program for Space Station thermal management are discussed. This program is intended to support the design and development of the thermal control systems for the Space Station. The topics discussed include heat pipe radiator evaluation, modular panel tests, two-phase heat transport, and testing of thermal buses using ammonia as the working fluid.

  13. Mobile with renewable energy. Marketable solutions for climate-friendly electromobility; Erneuerbar mobil. Marktfaehige Loesungen fuer eine klimafreundliche Elektromobilitaet

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2012-04-15

    The contribution under consideration reports on marketable solutions for climate-friendly electromobility. Under this aspect, the Federal Ministry for the Environment, Nature Conservation and Nuclear Safety (Berlin, Federal Republic of Germany) presents the following five funding programmes: (1) Field tests electromobility in passenger car traffic; (2) Field tests electromobility in trade and commerce; (3) Hybrid buses for environmentally friendly public transport; (4) An scientific accompanying research; (5) Battery recycling.

  14. Concentration measurement in a road tunnel as a method to assess "real-world" vehicles exhaust emissions

    Science.gov (United States)

    Zanini, G.; Berico, M.; Monforti, F.; Vitali, L.; Zambonelli, S.; Chiavarini, S.; Georgiadis, T.; Nardino, M.

    An experiment aimed at comparing particulate matter (PM) and polycyclic aromatic hydrocarbons (PAHs) concentrations produced in a road tunnel by buses is described. The experiment took place in 2001 in Bologna when a couple of buses belonging to the public transport fleet where driven backwards and forwards in a road tunnel closed to all other vehicles. Buses run in the tunnel for 8 h a day for 4 experiment days, each day using a different fuel: biodiesel, diesel-water emulsion, diesel-water emulsion with low sulphur content and commercial diesel. Average daily concentrations of PM of different sizes and of 12 PHAs were measured and comparison between different fuels was attempted in order to assess "real-world" exhaust emissions of different fuels. Due to heterogeneity of experimental conditions in different days and the relatively large measurement uncertainties, the effort was only partially successful, and it was not possible to state any firm conclusion on fuels reliability even if some indications in agreement with literature were found. Nevertheless, the experiment and the data analysis method developed could be of interest as a methodological approach for future experiments aimed at evaluating "real-world" exhaust emissions of single vehicles.

  15. Car Delay Model near Bus Stops with Mixed Traffic Flow

    Directory of Open Access Journals (Sweden)

    Yang Xiaobao

    2013-01-01

    Full Text Available This paper proposes a model for estimating car delays at bus stops under mixed traffic using probability theory and queuing theory. The roadway is divided to serve motorized and nonmotorized traffic streams. Bus stops are located on the nonmotorized lanes. When buses dwell at the stop, they block the bicycles. Thus, two conflict points between car stream and other traffic stream are identified. The first conflict point occurs as bicycles merge to the motorized lane to avoid waiting behind the stopping buses. The second occurs as buses merge back to the motorized lane. The average car delay is estimated as the sum of the average delay at these two conflict points and the delay resulting from following the slower bicycles that merged into the motorized lane. Data are collected to calibrate and validate the developed model from one site in Beijing. The sensitivity of car delay to various operation conditions is examined. The results show that both bus stream and bicycle stream have significant effects on car delay. At bus volumes above 200 vehicles per hour, the curbside stop design is not appropriate because of the long car delays. It can be replaced by the bus bay design.

  16. Environmental benefits of transport and stationary fuel cells

    Science.gov (United States)

    Hart, David; Hörmandinger, Günter

    The potential environmental benefits of using fuel cells in cars, buses and stationary combined heat and power (CHP) plants of different sizes have not been well-researched. This environmental analysis was conducted for the UK on a `full fuel cycle' basis, encompassing all greenhouse gas and regulated pollutant emissions for the supply chain and end-use technology under consideration. Solid polymer fuel cells (SPFCs) with methanol or natural gas reformers were analysed for cars, SPFCs and phosphoric acid fuel cells (PAFCs) with on-board hydrogen for buses. CHP plants were PAFCs or solid oxide fuel cells (SOFCs). Each option was compared with one or more conventional technologies. In all cases fuel cell technologies have substantially reduced emissions in comparison with conventional technologies. Regulated emissions are lowest, by up to two orders of magnitude, and those that do occur are primarily in the fuel supply chain. The fuel cell technologies are more efficient in all cases, and carbon dioxide (CO2) emissions are reduced broadly in line with energy savings. Methane emissions increase due to fuel switching, e.g. from petrol to natural gas powered buses, but from a very low base. The study pinpoints some areas in which alternative approaches could be made - the methods for generating and transporting hydrogen have a significant bearing on energy consumption and emissions. However, it is clear that from an overall emissions perspective the use of fuel cells in transport and power generation is highly beneficial.

  17. U.S. Department of Energy FreedomCAR & Vehicle Technologies Program Oil Bypass Filter Technology Evaluation - Sixth Quarterly Report, January - March 2004

    Energy Technology Data Exchange (ETDEWEB)

    U.S. Department of Energy; Larry Zirker

    2004-06-01

    This Oil Bypass Filter Technology Evaluation quarterly report (January-March 2004) details the ongoing fleet evaluation of an oil bypass filter technology by the Idaho National Engineering and Environmental Laboratory (INEEL) for the U.S. Department of Energy's FreedomCAR & Vehicle Technologies Program. Eight four-cycle diesel-engine buses used to transport INEEL employees on various routes have been equipped with oil bypass filter systems from the puraDYN Corporation. The bypass filters are reported to have engine oil filtering capability of <1 micron and a built-in additive package to facilitate extended oil-drain intervals. This quarter, the heavy-duty buses traveled 88,747 miles, and as of the end of March 2004, the eight buses have accumulated 412,838 total test miles without requiring an oil change. This represents an avoidance of 34 oil changes, which equates to 1,199 quarts (300 gallons) of new oil not consumed and, furthermore, 1,199 quarts of waste oil not generated.

  18. Performance of school bus retrofit systems: ultrafine particles and other vehicular pollutants.

    Science.gov (United States)

    Zhang, Qunfang; Zhu, Yifang

    2011-08-01

    This study evaluated the performance of retrofit systems for diesel-powered school buses, a diesel oxidation catalyst (DOC) muffler and a spiracle crankcase filtration system (CFS), regarding ultrafine particles (UFPs) and other air pollutants from tailpipe emissions and inside bus cabins. Tailpipe emissions and in-cabin air pollutant levels were measured before and after retrofitting when the buses were idling and during actual pick-up/drop off routes. Retrofit systems significantly reduced tailpipe emissions with a reduction of 20-94% of total particles with both DOC and CFS installed. However, no unequivocal decrease was observed for in-cabin air pollutants after retrofitting. The AC/fan unit and the surrounding air pollutant concentrations played more important roles for determining the in-cabin air quality of school buses than did retrofit technologies. Although current retrofit systems reduce children's exposure while waiting to board at a bus station, retrofitting by itself does not protect children satisfactorily from in-cabin particle exposures. Turning on the bus engine increased in-cabin UFP levels significantly only when the wind blew from the bus' tailpipe toward its hood with its windows open. This indicated that wind direction and window position are significant factors determining how much self-released tailpipe emissions may penetrate into the bus cabin. The use of an air purifier was found to remove in-cabin particles by up to 50% which might be an alternative short-to-medium term strategy to protect children's health.

  19. Projections of automobile, light truck, and bus stocks and sales, to the year 2000

    Energy Technology Data Exchange (ETDEWEB)

    Knorr, R.; Millar, M.

    1979-11-01

    Future stocks and sales of automobiles, light trucks, and buses are projected in this document. Automobile projections are developed for fleet and non-fleet sectors. Total auto stock is projected as a function of the number of households and of personal income, with adjustment for present and anticipated shifts from automobiles to light trucks. Automobile stocks and sales are projected to increase steadily through the year 2000 with a slightly larger growth rate associated with fleet autos. Projections of light-truck stocks and sales are developed for personal, service/utility, agriculture, manufacturing, government, wholesale/retail, and other uses based on anticipated employment and output for each of the use sectors. Projections anticipate the largest growth area to be that of personal light trucks. Bus stocks and sales are projected as a function of user populations, existing fleet characteristics, and anticipated usage patterns. School, intercity, and transit buses are included in the study. School buses are projected to have the largest percentage of growth in this sector.

  20. Simultaneous Optimal Placement of Distributed Generation and Electric Vehicle Parking Lots Based on Probabilistic EV Model

    Directory of Open Access Journals (Sweden)

    M.H. Amini

    2013-12-01

    Full Text Available High penetration of distributed generations and the increasing demand for using electric vehicles provide a lot of issues for the utilities. If these two effective elements of the future power system are used in an unscheduled manner, it may lead to the loss increment in distribution networks, dramatically. In this paper, the simultaneous allocation of distributed generations (DGs and electric vehicles (EVs parking lots has been studied in a radial distribution network. A distribution network which is upgrading and equipped with DGs is considered and these resources' optimal placement is achieved in interaction with the EV parking lots in order to minimize the power distribution network loss. The proposed method considers not only the loss minimization but also the reliability of the parking lot from the investor's point of view. The output of this model is the daily electricity demand of parking lot. The proposed method includes two levels. At the first level of the proposed algorithm, the parking lot investor makes decision and selects three candidate buses for each parking based on three main criteria. After making decision by the parking lot investor, the candidate buses are introduced to the distribution network operator. At the second stage, the distribution network operator allocates the DGs and EV parking lots based on the candidate buses of investor in order to achieve the minimum loss of the distribution network. Finally, the effectiveness of the proposed method is evaluated by allocating of DGs and EV parking lots simultaneously on the standard distribution test system.

  1. Generalized sensitivity evaluation of electrical power systems

    Energy Technology Data Exchange (ETDEWEB)

    Grewal, H.K.

    1987-01-01

    The material presented in this thesis is a logical extension of and addition to previous work on network sensitivities as applied to power-system analysis and planning. The continuing tendency of supplementing the existing extra-high voltage a.c. transmission systems with high-voltage d.c. (HVDC) lines was taken into consideration, and various relevant component models were investigated using a new hybrid network formulation based on the methodology developed by Bandler and El-Kady. The load buses, frequently modeled as PQ buses at which both the real and reactive injected powers are known, and the generator buses characterized by a constant voltage magnitude and constant real injected power, have been dealt with by exploiting a special complex conjugate notation. In addition, the current, voltage and/or power relationships associated with the transmission network branches were investigated. A hybrid formulation for generalized power system component models were developed. This novel formulation not only encompasses the work established on the basis of one-port theory, but it is also capable of manipulating multiport, nonreciprocal, a.c. as well as integrated a.c.-d.c. bulk transmission networks.

  2. Case Study - Propane School Bus Fleets

    Energy Technology Data Exchange (ETDEWEB)

    Laughlin, M; Burnham, A.

    2014-08-31

    As part of the U.S. Department of Energy’s (DOE’s) effort to deploy transportation technologies that reduce U.S. dependence on imported petroleum, this study examines five school districts, one in Virginia and four in Texas, successful use of propane school buses. These school districts used school buses equipped with the newly developed liquid propane injection system that improves vehicle performance. Some of the school districts in this study saved nearly 50% on a cost per mile basis for fuel and maintenance relative to diesel. Using Argonne National Laboratory’s Alternative Fuel Life-Cycle Environmental and Economic Transportation (AFLEET) Tool developed for the DOE’s Clean Cities program to help Clean Cities stakeholders estimate petroleum use, greenhouse gas (GHG) emissions, air pollutant emissions and cost of ownership of light-duty and heavy-duty vehicles, the results showed payback period ranges from 3—8 years, recouping the incremental cost of the vehicles and infrastructure. Overall, fuel economy for these propane vehicles is close to that of displaced diesel vehicles, on an energy-equivalent basis. In addition, the 110 propane buses examined demonstrated petroleum displacement, 212,000 diesel gallon equivalents per year, and GHG benefits of 770 tons per year.

  3. Opendata dinamici per i servizi di infomobilità della Smartcity a Bari

    Directory of Open Access Journals (Sweden)

    Vincenzo Barbieri

    2015-02-01

    Full Text Available Il Comune di Bari ed AMTAB, hanno deciso di “liberare” a settembre 2014 i dati derivanti dal telecontrollo dei mezzi di trasporto AMTAB , rendendo li fruibili in modalità “opendata”. Questa iniziativa punta a soddisfare l’esigenza d’integrare le diverse soluzioni per la mobilità e realizzare un sistema di monitoraggio della mobilità sostenibile e intelligente nell’ambito del programma Bari Smart City.In September 2014 the City of Bari and AMTAB, the local public transport company, decided to open the data derived from the remote control of AMTAB buses with a creative commons CC0 license. The data published are both static and dynamic: they are accessible through web services and provide information, among others, on the list of bus stops and estimated times for the arrival of buses at the stops. These data are used to calculate information on the congestion level of traffic on the roads covered by the city buses. Such information are available as opendata too. This initiative is part of a Living Lab aiming to meet the need of the city of Bari for the integration of different mobility solutions and the implementation of an integrated system for the monitoring of the smart and sustainable mobility in Bari. 

  4. Development of database of real-world diesel vehicle emission factors for China.

    Science.gov (United States)

    Shen, Xianbao; Yao, Zhiliang; Zhang, Qiang; Wagner, David Vance; Huo, Hong; Zhang, Yingzhi; Zheng, Bo; He, Kebin

    2015-05-01

    A database of real-world diesel vehicle emission factors, based on type and technology, has been developed following tests on more than 300 diesel vehicles in China using a portable emission measurement system. The database provides better understanding of diesel vehicle emissions under actual driving conditions. We found that although new regulations have reduced real-world emission levels of diesel trucks and buses significantly for most pollutants in China, NOx emissions have been inadequately controlled by the current standards, especially for diesel buses, because of bad driving conditions in the real world. We also compared the emission factors in the database with those calculated by emission factor models and used in inventory studies. The emission factors derived from COPERT (Computer Programmer to calculate Emissions from Road Transport) and MOBILE may both underestimate real emission factors, whereas the updated COPERT and PART5 (Highway Vehicle Particulate Emission Modeling Software) models may overestimate emission factors in China. Real-world measurement results and emission factors used in recent emission inventory studies are inconsistent, which has led to inaccurate estimates of emissions from diesel trucks and buses over recent years. This suggests that emission factors derived from European or US-based models will not truly represent real-world emissions in China. Therefore, it is useful and necessary to conduct systematic real-world measurements of vehicle emissions in China in order to obtain the optimum inputs for emission inventory models.

  5. Investigation of large transit vehicle accidents and establishing appropriate protection for wheelchair riders.

    Science.gov (United States)

    Shaw, Greg

    2008-01-01

    Securing wheelchairs and restraining wheelchair riders on buses is difficult for many wheelchair riders and transit providers. This study examined injury-producing events aboard large transit buses in general in an attempt to better understand the potential risks and required protection for wheelchair users. The study found that few injuries and fatalities occur on large transit buses. Examination of the relatively few injury-producing events advanced the understanding of these events in terms of acceleration/deceleration magnitude and direction. Low acceleration/deceleration, or low-g, events such as those involving abrupt braking or turning occur frequently and are associated with approximately half of onboard passenger injuries. Unfortunately, the actual frequency of high-g events was not determined. Most of the injurious events involved the bus rapidly decelerating because of frontal impacts with another vehicle or roadside object. Further study is needed to determine the magnitude and frequency of high-g events. This information is necessary to determine the level of protection commensurate with real-world risk necessary for wheelchair riders in the transit bus environment and may ultimately facilitate the development of easier-to-use safety systems that secure and restrain wheelchairs and their riders.

  6. Performance of the Priority Control Strategies for Bus Rapid Transit: Comparative Study from Scenario Microsimulation Using VISSIM

    Directory of Open Access Journals (Sweden)

    Min Yang

    2013-01-01

    Full Text Available Bus rapid transit (BRT has a great potential to improve the service level of transit system and has been implemented in many Chinese cities. However, the priority it can provide to buses has not been explored fully. Therefore, this study mainly investigated two advanced control strategies (signal priority using advanced detection and transit speed control. Signal priority using advanced detection is a strategy which detects one cycle ahead of buses’ arrival in order to adapt a more flexible control algorithm to provide signal priority for buses. Another is transit speed control, which provides priority at intersections for buses by controlling the speed of them and predicting their arrival at certain intersection. These two advanced strategies were modeled and evaluated using simulation software VISSIM and presented better performance than other three scenarios (base case, exclusive bus lane, and conventional transit signal priority. Only the eastbound direction would be researched as its traffic flow and bus volume are much larger than those of the other direction. Data used in this model was collected in Yingtan City. It is also shown that both the operation of BRT and the efficiency of private traffic can be much improved by applying the two strategies proposed above.

  7. Low power interconnect design

    CERN Document Server

    Saini, Sandeep

    2015-01-01

    This book provides practical solutions for delay and power reduction for on-chip interconnects and buses.  It provides an in depth description of the problem of signal delay and extra power consumption, possible solutions for delay and glitch removal, while considering the power reduction of the total system.  Coverage focuses on use of the Schmitt Trigger as an alternative approach to buffer insertion for delay and power reduction in VLSI interconnects. In the last section of the book, various bus coding techniques are discussed to minimize delay and power in address and data buses.   ·         Provides practical solutions for delay and power reduction for on-chip interconnects and buses; ·         Focuses on Deep Sub micron technology devices and interconnects; ·         Offers in depth analysis of delay, including details regarding crosstalk and parasitics;  ·         Describes use of the Schmitt Trigger as a versatile alternative approach to buffer insertion for del...

  8. Inter ISO Market Coordination by Calculating Border Locational Marginal Prices

    Directory of Open Access Journals (Sweden)

    BABIC, A. B.

    2013-05-01

    Full Text Available In this paper the methodology for solving Locational Marginal Price (LMP differences (inconsistency of LMPs that arise at the boundary buses between separate power markets is proposed. The algorithm developed enables us to obtain consistent LMP values at the boundary buses between interconnected ISOs. A Primal-Dual Interior Point based optimal power flow (OPF is applied, with complete set of power system physical limit constraints, to solve a regional spot market. The OPF is implemented such that producer and consumer behaviors are modeled simultaneously, while the welfare is maximized. In this paper a generalized methodology for multiple ISOs case is proposed and later it is practically applied on two interconnected independent entities. The algorithm for approximation of cost coefficients of generators and dispatchable loads for neighboring ISOs is proposed. The developed algorithm enables participating ISOs to obtain LMPs at the boundary buses with other interconnected ISOs. By controlling interchange of electric power at the scheduled level, regional spot markets are resolved eliminating possible exercise of market power by individual interconnected ISOs. Results of proposed methodology are tested on the IEEE 118-bus power system.

  9. Improving VANETs Connectivity with a Totally Ad Hoc Living Mobile Backbone

    Directory of Open Access Journals (Sweden)

    Joilson Alves Junior

    2015-01-01

    Full Text Available The vehicular ad hoc network (VANET for intelligent transportation systems is an emerging concept to improve transportation security, reliability, and management. The network behavior can be totally different in topological aspects because of the mobility of vehicular nodes. The topology can be fully connected when the flow of vehicles is high and may have low connectivity or be invalid when the flow of vehicles is low or unbalanced. In big cities, the metropolitan buses that travel on exclusive lanes may be used to set up a metropolitan vehicular data network (backbone, raising the connectivity among the vehicles. Therefore, this paper proposes the implementation of a living mobile backbone, totally ad hoc (MOB-NET, which will provide infrastructure and raise the network connectivity. In order to show the viability of MOB-NET, statistical analyses were made with real data of express buses that travel through exclusive lanes, besides evaluations through simulations and analytic models. The statistic, analytic, and simulation results prove that the buses that travel through exclusive lanes can be used to build a communication network totally ad hoc and provide connectivity in more than 99% of the time, besides raising the delivery rate up to 95%.

  10. Fly-by-Light Advanced Systems Hardware (FLASH) program

    Science.gov (United States)

    Bedoya, Carlos A.

    1995-05-01

    Fiber optics are immune to electromagnetic emissions and have the potential to eliminate this concern especially in flight critical applications if they can be developed to the same level of technology as current systems using wire to carry the signals. As aircraft become more and more dependent of digital signals to control all systems, the Electromagnetic Environment (EME) will become more and more a concern for the safe long term operation. The International Severe HIRF electromagnetic environment (EME) is less than 2000 Volts per meter below 400 MHz and reaches a maximum of 6,850 Volts per meter in the 4-6 GHz range. The normal assumption is that a metal or composite aircraft skin with appropriate seals provides 20 dB attenuation of the external environment. This reduces peak levels at the avionics boxes to less than 200 Volts per meter below 400 MHz and a maximum of 685 Volts per meter in the 406 GHz range. MIL-STD-461D imposed an additional box level requirement to 200 Volts per meter from 10 KHz to 40 GHz. This requirement equals or surpasses the attenuated HIRF environment over significant portions of the spectrum and implies that the aircraft must be designed to achieve and maintain this value throughout its service life. Although wires can be shielded and designed to achieve these requirements, it is a more expensive process, adds the weight of shielding and requires maintenance of the shielding integrity at all times. The very light weight and high bandwidth of fiber optics also offer the potential of eliminating the number of connections and weight savings in aircraft. For example on a one to one replacement of wire by fiber, it is estimated that fiber would weight about 1/20 the weight of wire. Current wire buses used for duplex communications in aircraft applications have a bandwidth of about 1 MHz while equivalent buses using fiber optics have a bandwidth of 20 MHz. For other applications such as video and avionics interfaces, fiber buses in the

  11. Intelligent Urban Public Transportation for Accessibility Dedicated to People with Disabilities

    Directory of Open Access Journals (Sweden)

    Jian Li

    2012-08-01

    Full Text Available The traditional urban public transport system generally cannot provide an effective access service for people with disabilities, especially for disabled, wheelchair and blind (DWB passengers. In this paper, based on advanced information & communication technologies (ICT and green technologies (GT concepts, a dedicated public urban transportation service access system named Mobi+ has been introduced, which facilitates the mobility of DWB passengers. The Mobi+ project consists of three subsystems: a wireless communication subsystem, which provides the data exchange and network connection services between buses and stations in the complex urban environments; the bus subsystem, which provides the DWB class detection & bus arrival notification services; and the station subsystem, which implements the urban environmental surveillance & bus auxiliary access services. The Mobi+ card that supports multi-microcontroller multi-transceiver adopts the fault-tolerant component-based hardware architecture, in which the dedicated embedded system software, i.e., operating system micro-kernel and wireless protocol, has been integrated. The dedicated Mobi+ embedded system provides the fault-tolerant resource awareness communication and scheduling mechanism to ensure the reliability in data exchange and service provision. At present, the Mobi+ system has been implemented on the buses and stations of line ‘2’ in the city of Clermont-Ferrand (France. The experiential results show that, on one hand the Mobi+ prototype system reaches the design expectations and provides an effective urban bus access service for people with disabilities; on the other hand the Mobi+ system is easily to deploy in the buses and at bus stations thanks to its low energy consumption and small form factor.

  12. BUS BAY PERFORMANCE AND ITS INFLUENCE ON THE CAPACITY OF ROAD NETWORK IN DAR ES SALAAM

    Directory of Open Access Journals (Sweden)

    Nurdin K. Mushule

    2012-01-01

    Full Text Available One of major problems facing motorists in Dar es Salaam city today is congestion. Bus bays have a significant influence on the capacity of a roadway because they interfere with passing vehicles primarily when buses maneuver to pull into and out of bus bays. Bus bay stops will also interfere with vehicles movement if bus demand exceeds the bus bay capacity resulting in some buses waiting in the travel lane until the buses occupying the bay exit the bay. This paper presents the results of a study which was carried out to evaluate the bus bay performance and its influence on the capacity of the roadway network in the city of Dar es Salaam. The case study area covered 11 bus stops along Morogoro road from Ubungo to Magomeni Mapipa. Capacity of bus bays was studied using procedure outlined in the Transit Capacity and Quality of Service Manual of 2003. This enabled the researcher to determine parameters such as dwell times and clearance times which are major determinants of bus stop capacity. The results indicate that only 18% of the bus bay stops studied did not have adequate capacity to cater for the available demand. 9% did not have adequate capacity during peak hours but the capacity was adequate during off-peak hours. The remaining 73% of bus bay stops possess adequate capacity all the time. Although most bus bay stops studied possess adequate capacity, severe congestion was observed at these locations. This is due to erratic behavior of bus drivers who do not utilize the provided space for them to drop off and pick up passengers. Clearly, this is an area that requires more strict enforcement in order to ease the congestion problem in the city by operating the existing capacity more efficiently."

  13. The GREET Model Expansion for Well-to-Wheels Analysis of Heavy-Duty Vehicles

    Energy Technology Data Exchange (ETDEWEB)

    Cai, Hao [Argonne National Lab. (ANL), Argonne, IL (United States); Burnham, Andrew [Argonne National Lab. (ANL), Argonne, IL (United States); Wang, Michael [Argonne National Lab. (ANL), Argonne, IL (United States); Hang, Wen [Argonne National Lab. (ANL), Argonne, IL (United States); Vyas, Anant [Argonne National Lab. (ANL), Argonne, IL (United States)

    2015-05-01

    Heavy-duty vehicles (HDVs) account for a significant portion of the U.S. transportation sector’s fuel consumption, greenhouse gas (GHG) emissions, and air pollutant emissions. In our most recent efforts, we expanded the Greenhouse gases, Regulated Emissions, and Energy use in Transportation (GREETTM) model to include life-cycle analysis of HDVs. In particular, the GREET expansion includes the fuel consumption, GHG emissions, and air pollutant emissions of a variety of conventional (i.e., diesel and/or gasoline) HDV types, including Class 8b combination long-haul freight trucks, Class 8b combination short-haul freight trucks, Class 8b dump trucks, Class 8a refuse trucks, Class 8a transit buses, Class 8a intercity buses, Class 6 school buses, Class 6 single-unit delivery trucks, Class 4 single-unit delivery trucks, and Class 2b heavy-duty pickup trucks and vans. These vehicle types were selected to represent the diversity in the U.S. HDV market, and specific weight classes and body types were chosen on the basis of their fuel consumption using the 2002 Vehicle Inventory and Use Survey (VIUS) database. VIUS was also used to estimate the fuel consumption and payload carried for most of the HDV types. In addition, fuel economy projections from the U.S. Energy Information Administration, transit databases, and the literature were examined. The U.S. Environmental Protection Agency’s latest Motor Vehicle Emission Simulator was employed to generate tailpipe air pollutant emissions of diesel and gasoline HDV types.

  14. Implementation of a solar thermal electricity pilot plant (Concentrated Tower) of 1MW and introduction of a bus fleet of plug-in hybrids on the Ilha do Fundao, Rio de Janeiro, Brazil; Implementacao de uma planta piloto de heliotermia (Torre de Concentracao) de 1MW e introducao de uma frota de onibus hibridos plug-in na Ilha do Fundao

    Energy Technology Data Exchange (ETDEWEB)

    Borba, Bruno Soares Moreira Cesar; Malagueta, Diego Cunha [Coordenacao dos Programas de Pos-Graduacao de Engenharia (PPE/COPPE/UFRJ), RJ (Brazil). Programa de Planejamento Energetico

    2010-07-01

    The aim of this paper is to simulate a solar thermal electricity pilot plant at the Campus of the Federal University of Rio de Janeiro (UFRJ), at Fundao Island, which would generate part of the electricity demanded by the Technology Center (CT) of the UFRJ. Based on the electricity demand from UFRJ and the electric prices paid by the institution, this study proposes the construction of a 1MW Concentrated Solar Power (CSP) pilot plant and analyses the economical, energy and environmental viability of implementation of this plant, operating from 2015 to 2045. This CSP plant would cover a field of 0,01km{sup 2} and have a 30% of capacity factor. This study also evaluates the impact caused by the substitution of the current Campus internal bus fleet for plug-in hybrid electric buses. The current service is provided by Normandy, which operates 12 buses plus 1 backup. These new buses would be regularly partially recharged by the energy generated from CSP. All the simulations have been made with the RETScreen software, which simulated the operation of the CSP, the amount of electricity produced, the carbon emissions avoided, the acquisition and implementation of the plug-in hybrid electric bus fleet and the cash flow. Six scenarios generated were, namely A1, B1, C1 (all for lower costs for the CSP plants) and A2, B2, C2 (for higher costs). For a social discount rate around 8% and along 30 years, only the A1, C1 and C2 scenarios showed a non-negative cash flow. Also, the emissions avoided were around 222 tCO{sub 2}/yr (or 6.660 tCO{sub 2} over 30 years) in the A1 and A2 scenarios, and around 550 tCO{sub 2}/yr (or 16.512 tCO{sub 2} over 30 years) in all others scenarios. (author)

  15. Road safety issues for bus transport management.

    Science.gov (United States)

    Cafiso, Salvatore; Di Graziano, Alessandro; Pappalardo, Giuseppina

    2013-11-01

    Because of the low percentage of crashes involving buses and the assumption that public transport improves road safety by reducing vehicular traffic, public interest in bus safety is not as great as that in the safety of other types of vehicles. It is possible that less attention is paid to the significance of crashes involving buses because the safety level of bus systems is considered to be adequate. The purpose of this study was to evaluate the knowledge and perceptions of bus managers with respect to safety issues and the potential effectiveness of various technologies in achieving higher safety standards. Bus managers were asked to give their opinions on safety issues related to drivers (training, skills, performance evaluation and behaviour), vehicles (maintenance and advanced devices) and roads (road and traffic safety issues) in response to a research survey. Kendall's algorithm was used to evaluate the level of concordance. The results showed that the majority of the proposed items were considered to have great potential for improving bus safety. The data indicated that in the experience of the participants, passenger unloading and pedestrians crossing near bus stops are the most dangerous actions with respect to vulnerable users. The final results of the investigation showed that start inhibition, automatic door opening, and the materials and internal architecture of buses were considered the items most strongly related to bus passenger safety. Brake assistance and vehicle monitoring systems were also considered to be very effective. With the exception of driver assistance systems for passenger and pedestrian safety, the perceptions of the importance of other driver assistance systems for vehicle monitoring and bus safety were not unanimous among the bus company managers who participated in this survey. The study results showed that the introduction of new technologies is perceived as an important factor in improving bus safety, but a better understanding

  16. Alternative fuels for vehicles fleet demonstration program final report. Volume 1: Summary

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1997-03-01

    The Alternative Fuels for Vehicles Fleet Demonstration Program (AFV-FDP) was a multiyear effort to collect technical data for use in determining the costs and benefits of alternative-fuel vehicles in typical applications in New York State. During 3 years of collecting data, 7.3 million miles of driving were accumulated, 1,003 chassis-dynamometer emissions tests were performed, 862,000 gallons of conventional fuel were saved, and unique information was developed about garage safety recommendations, vehicle performance, and other topics. Findings are organized by vehicle and fuel type. For light-duty compressed natural gas (CNG) vehicles, technology has evolved rapidly and closed-loop, electronically-controlled fuel systems provide performance and emissions advantages over open-loop, mechanical systems. The best CNG technology produces consistently low tailpipe emissions versus gasoline, and can eliminate evaporative emissions. Reduced driving range remains the largest physical drawback. Fuel cost is low ($/Btu) but capital costs are high, indicating that economics are best with vehicles that are used intensively. Propane produces impacts similar to CNG and is less expensive to implement, but fuel cost is higher than gasoline and safety codes limit use in urban areas. Light-duty methanol/ethanol vehicles provide performance and emissions benefits over gasoline with little impact on capital costs, but fuel costs are high. Heavy-duty CNG engines are evolving rapidly and provide large reductions in emissions versus diesel. Capital costs are high for CNG buses and fuel efficiency is reduced, but the fuel is less expensive and overall operating costs are about equal to those of diesel buses. Methanol buses provide performance and emissions benefits versus diesel, but fuel costs are high. Other emerging technologies were also evaluated, including electric vehicles, hybrid-electric vehicles, and fuel cells.

  17. Analysis of temperature and pressure changes in liquefied natural gas (LNG) cryogenic tanks

    Science.gov (United States)

    Chen, Q.-S.; Wegrzyn, J.; Prasad, V.

    2004-10-01

    Liquefied natural gas (LNG) is being developed as a transportation fuel for heavy vehicles such as trucks and transit buses, to lessen the dependency on oil and to reduce greenhouse gas emissions. The LNG stations are properly designed to prevent the venting of natural gas (NG) from LNG tanks, which can cause evaporative greenhouse gas emissions and result in fluctuations of fuel flow and changes of fuel composition. Boil-off is caused by the heat added into the LNG fuel during the storage and fueling. Heat can leak into the LNG fuel through the shell of tank during the storage and through hoses and dispensers during the fueling. Gas from tanks onboard vehicles, when returned to LNG tanks, can add additional heat into the LNG fuel. A thermodynamic and heat transfer model has been developed to analyze different mechanisms of heat leak into the LNG fuel. The evolving of properties and compositions of LNG fuel inside LNG tanks is simulated. The effect of a number of buses fueled each day on the possible total fuel loss rate has been analyzed. It is found that by increasing the number of buses, fueled each day, the total fuel loss rate can be reduced significantly. It is proposed that an electric generator be used to consume the boil-off gas or a liquefier be used to re-liquefy the boil-off gas to reduce the tank pressure and eliminate fuel losses. These approaches can prevent boil-off of natural gas emissions, and reduce the costs of LNG as transportation fuel.

  18. SunLine Transit Agency Advanced Technology Fuel Cell Bus Evaluation: First Results Report

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, L.; Chandler, K.

    2011-03-01

    This report describes operations at SunLine Transit Agency for their newest prototype fuel cell bus and five compressed natural gas (CNG) buses. In May 2010, SunLine began operating its sixth-generation hydrogen fueled bus, an Advanced Technology (AT) fuel cell bus that incorporates the latest design improvements to reduce weight and increase reliability and performance. The agency is collaborating with the U.S. Department of Energy's (DOE) National Renewable Energy Laboratory (NREL) to evaluate the bus in revenue service. This report provides the early data results and implementation experience of the AT fuel cell bus since it was placed in service.

  19. 广告打进校园?%Selling out ?

    Institute of Scientific and Technical Information of China (English)

    刘倩(译)

    2012-01-01

    当美国佛罗里达州湖县的孩子们下次来学校上课时,他们也许会碰到一些意想不到的事情。该县官员正在考虑允许企业在校车及学校的午餐菜谱上打广告。%Kids in Lake County, Fla., may get more than they bargained for1 .the next time they head to class.Officials in that county are considering letting companies advertise inside school buses and on school lunch menus.

  20. Developing a Natural Gas-Powered Bus Rapid Transit Service: A Case Study on Leadership: Roaring Fork Transportation Authority (Presentation); NREL (National Renewable Energy Laboratory)

    Energy Technology Data Exchange (ETDEWEB)

    Schroeder, A.

    2015-03-01

    The Roaring Fork Transportation Authority (RFTA) represents a series of unique successes in alternative fuel deployment by pushing the envelope with innovative solutions. In the last year, RFTA demonstrated the ability to utilize compressed natural gas buses at a range of altitudes, across long distances, in extreme weather conditions and in a modern indoor fueling and maintenance facility - allwhile saving money and providing high-quality customer service. This case study will highlight how the leadership of organizations and communities that are implementing advances in natural gas vehicle technology is paving the way for broader participation.

  1. LSI設計教育のためのC++テンプレートライブラリの開発

    OpenAIRE

    大村,道郎; 丸本,敬幸; 田中,武

    2002-01-01

    In the last few years, LSI design using C++ language has been the focus of attention. However, almost no library written in C++ is opened to the public. Therefore, development of a library written in C++ is necessary in order to design LSI efficiently. C++ language for LSI design needs many types as int4, int8, etc., which correspond to the bit width of ports, signals, buses, etc. of hardware. If we use C++ classes to develop the library for LSI, we need as many classes as types. In order to ...

  2. Studies on urban vehicular ad-hoc networks

    CERN Document Server

    Zhu, Hongzi

    2013-01-01

    With the advancement of wireless technology, vehicular ad hoc networks (VANETs) are emerging as a promising approach to realizing 'smart cities' and addressing many important transportation problems such as road safety, efficiency, and convenience.This brief provides an introduction to the large trace data set collected from thousands of taxis and buses in Shanghai, the largest metropolis in China. It also presents the challenges, design issues, performance modeling and evaluation of a wide spectrum of VANET research topics, ranging from realistic vehicular mobility models and opportunistic ro

  3. Voltage sags due to the short-circuits on transmission lines; Afundamentos de tensao provocados por curto-circuitos em linhas de transmissao

    Energy Technology Data Exchange (ETDEWEB)

    Klock Junior, Odemar Solano [Companhia Paranaense de Energia (COPEL), Curitiba, PR (Brazil)

    2001-07-01

    This paper analyses the voltage sags influence on the buses, including the ones where consumers of the COPEL transmission electric system, determining the sags number and the approximate values for short-circuits on transmission lines. The voltage values, during the the short-circuit regime are obtained from the data for the short-circuit program. The short-circuits are simulated by the assembly of the electric system impedance matrix, from where the voltage values for short-circuits on any point of the electric system can be determined using simply calculations.

  4. The Bubbles of China Stock Market Based on Return Decomposition and Cumulative Return

    Institute of Scientific and Technical Information of China (English)

    ZHANG Xiao-xia; WU Chong-feng

    2006-01-01

    Using Capital Asset Pricing Model Integrating both Firm and Market (CAPMIFM), we first decompose the asset return into two components. One is called the fundamental return,which is related to the intrinsic value of the asset. The other is called bubble return, which is derived from the asset bubbles. Then a stock bubble return model bused on cumulative return is proposed. The model exhibits characterizing log-periodic oscillations and a power law acceleration of the cumulative return. Empirical results suggest that the model has a good fit for the bubbles of China stock market.

  5. Proof of Concept for the Rewrite Rule Machine: Interensemble Studies

    Science.gov (United States)

    1994-02-23

    0 . a w -11U*414 44.44 12 weI. ow33 I k. 1w 80 a ~ 4 u*6~.4 I464. ’c0 1 .. 0 c I 0 K~ 13333 x 14 00 4 a k 0 1. C6 at~ 0 1 3a 3. 3333 cca* s0.. 9 v~* 5...op==SELCELL) for (i=0; i<CELLIUM; i++) cell~iJ.aux = 0; 12 -Always reset port buses. for (i=O; i<PORTNUK; i++) porttiJ.portval = 0. for ( isO ; i

  6. Testability Design Rating System: Testability Handbook. Volume 1

    Science.gov (United States)

    1992-02-01

    4205 12a. DISTRIBUTION/ AVAILABILTY STATEMENT 12b. DISTRIBUTION CODE Approved for public release; distribution unlimited. 13. ABSTRACT (Maivw 200s) This...DATA EB-1 OMBER A PLATFORMD B-1 BOMBER SUBSYSTEMS CHECKED BY C.I.T.S. FUEL SYSTEM E N G IN E SF L D R C O M T ENGINE THRUST CONT FLANDING GEAR &DCMET...to functional usage . EDGE EDGE UIA CNNETOPCONNECTOR UIB 2 COMMAND Figure 7-10. Use of Buffers 7.4.3.3 Bused Logic. Systems designed with

  7. Puff the Red Dragon

    Institute of Scientific and Technical Information of China (English)

    VALERIE; SARTOR

    2008-01-01

    As of May 1,2008,stricter anti- smoking regulations went into effect around Beijing in accor- dance with international treaties that guarantee a smoke-free Olympics.In 1995 and 1996 the local people’s congress established the first set of laws against smok- ing in public places around Beijing,with the May laws acting as more developed implementation regulations.When asked, my Chinese colleagues told me that smoking on buses has been banned much longer than 1995 and trains require smokers to stand in areas between cars so they do not disturb other passengers.

  8. Enhancement of a Power System Transient Stability Using Static Synchronous Series Compensator SSSC

    Directory of Open Access Journals (Sweden)

    Mustafa M. Al-Eedany

    2013-01-01

    Full Text Available Static Synchronous Series Compensator (SSSC is a well known device for effectively regulating the active power flow in a power system. In this paper, the SSSC linearized power flow equations are incorporated into Newton-Raphson algorithm in a MATLAB written program to investigate the control of active poweer flow and the transient stability of a five bus and a thirty bus IEEE test systems, during abnormal conduction (three phase fault near buses. A comparison of the results obtained for the base case without SSSC and with it to investigate the effectiveness of the device on both of the active power flow and the transient stability.

  9. Swisstrolley 3 - An articulated trolley bus; SWISSTROLLEY 3. Gelenktrolleybus

    Energy Technology Data Exchange (ETDEWEB)

    Gisler, H.-J.

    2006-07-01

    This illustrated final report for the Swiss Federal Office of Energy (SFOE) takes a look at the Swisstrolley 3 low-floor, articulated trolley bus developed in Switzerland by the Hess AG company. Various features of the variants of the trolley bus, including single vehicle, single and double-articulated buses and bus trailers, are discussed. The reductions achieved in energy consumption, weight and noise are discussed. Typical values for power consumption are presented in graphical form. Economic viability and passenger-friendliness are examined, as are possibilities for further improvement.

  10. A CAMAC and FASTBUS engineering test environment supported by a MicroVAX/MicroVMS system

    Energy Technology Data Exchange (ETDEWEB)

    Logg, C.A.

    1987-10-01

    A flexible, multiuser engineering test environment has been established for the engineers in SLAC's Electronic Instrumentation Engineering group. The system hardware includes a standard MicroVAX II and MicroVAX I with multiple CAMAC, FASTBUS, and GPIB instrumentation buses. The system software components include MicroVMS licenses with DECNET/SLACNET, FORTRAN, PASCAL, FORTH, and a versatile graphical display package. In addition, there are several software utilities available to facilitate FASTBUS and CAMAC prototype hardware debugging. 16 refs., 7 figs.

  11. Decoupled ranking of branch outages causing limit violations

    Energy Technology Data Exchange (ETDEWEB)

    Buddhi, K.L.P.; Bijwe, P.R.; Nanda, P. (Indian Inst. of Tech., New Delhi (India))

    1990-01-01

    This paper describes a decoupled method for ranking contingencies based on voltage deviation, overload and reactive power limit violation performance indices. It is based on non-iterative compensation technique. A novel method of secondary injections at voltage controlled buses (including slack) to maintain their voltages constant and secondary injections at slack bus to maintain its angle constant has been developed. Results for four sample test systems have been obtained to test the effectiveness of the method.l The rankings obtained by the new method are in good agreement with those generated by rigorous AC load flow solutions for all the test systems investigated.

  12. Electronic publishing: the movement from print to digital publication.

    Science.gov (United States)

    Ludwick, R; Glazer, G

    2000-01-01

    This article provides an overview of electronic publishing, describes how information increasingly is being exchanged within the scientific community, and discusses the scholarly qualifications of electronic venues. The following content is included: a.definition of electronic publishing; b.uses and types of electronic publishing; c.uses of electronic journals in nursing and health care; d.advantages and disadvantages of electronic journals; e.advantages and disadvantages of print journals; and f.the authors' projections for the future. Hotlinks to a variety of Internet resources on electronic resources are integrated throughout the article.

  13. Final Report: Mass Production Cost Estimation of Direct H2 PEM Fuel Cell Systems for Transportation Applications (2012-2016)

    Energy Technology Data Exchange (ETDEWEB)

    James, Brian David [Strategic Analysis Inc., Arlington, VA (United States); Huya-Kouadio, Jennie Moton [Strategic Analysis Inc., Arlington, VA (United States); Houchins, Cassidy [Strategic Analysis Inc., Arlington, VA (United States); DeSantis, Daniel Allen [Strategic Analysis Inc., Arlington, VA (United States)

    2016-09-01

    This report summarizes project activities for Strategic Analysis, Inc. (SA) Contract Number DE-EE0005236 to the U.S. Department of Energy titled “Transportation Fuel Cell System Cost Assessment”. The project defined and projected the mass production costs of direct hydrogen Proton Exchange Membrane fuel cell power systems for light-duty vehicles (automobiles) and 40-foot transit buses. In each year of the five-year contract, the fuel cell power system designs and cost projections were updated to reflect technology advances. System schematics, design assumptions, manufacturing assumptions, and cost results are presented.

  14. Chinese Autos' Debut in Cambodia--Let more Cambodians know high-quality Chinese products

    Institute of Scientific and Technical Information of China (English)

    Jing; Xiong; Phnom; Penh

    2005-01-01

      The 3rd Mudan Cup China International Auto Exhibition (Vietnam & Cambodia) was held in January 28, 2005 in Phnom Penh Hotel. This is the first debut of Chinese autos in Cambodia. 11 buses, 12 seats tourism vans, cargo vans and trucks and 9 motorcycles of different brands showed Cambodians the real Chinese famous brands and high-quality automobiles. The 3rd "Mudan Cup"China International Auto Exhibition Tour was organized by the Society of Automotive Engineers of China, Department of Media and Press of CCPIT, Cambodia Tang Ren International Co., Ltd.,Cambodia Kaide Trade Co., Ltd. andChina Grand River Group.……

  15. Chinese Autos' Debut in Cambodia--Let more Cambodians know high-quality Chinese products

    Institute of Scientific and Technical Information of China (English)

    Jing Xiong; Phnom Penh

    2005-01-01

    @@ The 3rd Mudan Cup China International Auto Exhibition (Vietnam & Cambodia) was held in January 28, 2005 in Phnom Penh Hotel. This is the first debut of Chinese autos in Cambodia. 11 buses, 12 seats tourism vans, cargo vans and trucks and 9 motorcycles of different brands showed Cambodians the real Chinese famous brands and high-quality automobiles. The 3rd "Mudan Cup"China International Auto Exhibition Tour was organized by the Society of Automotive Engineers of China, Department of Media and Press of CCPIT, Cambodia Tang Ren International Co., Ltd.,Cambodia Kaide Trade Co., Ltd. andChina Grand River Group.

  16. Nanophotonic quantum computer based on atomic quantum transistor

    Energy Technology Data Exchange (ETDEWEB)

    Andrianov, S N [Institute of Advanced Research, Academy of Sciences of the Republic of Tatarstan, Kazan (Russian Federation); Moiseev, S A [Kazan E. K. Zavoisky Physical-Technical Institute, Kazan Scientific Center, Russian Academy of Sciences, Kazan (Russian Federation)

    2015-10-31

    We propose a scheme of a quantum computer based on nanophotonic elements: two buses in the form of nanowaveguide resonators, two nanosized units of multiatom multiqubit quantum memory and a set of nanoprocessors in the form of photonic quantum transistors, each containing a pair of nanowaveguide ring resonators coupled via a quantum dot. The operation modes of nanoprocessor photonic quantum transistors are theoretically studied and the execution of main logical operations by means of them is demonstrated. We also discuss the prospects of the proposed nanophotonic quantum computer for operating in high-speed optical fibre networks. (quantum computations)

  17. Risk factors associated with bus accident severity in the United States: A generalized ordered logit model

    DEFF Research Database (Denmark)

    Kaplan, Sigal; Prato, Carlo Giacomo

    2012-01-01

    Introduction: Recent years have witnessed a growing interest in improving bus safety operations worldwide. While in the United States buses are considered relatively safe, the number of bus accidents is far from being negligible, triggering the introduction of the Motor-coach Enhanced Safety Act...... that accident severity increases: (i) for young bus drivers under the age of 25; (ii) for drivers beyond the age of 55, and most prominently for drivers over 65 years old; (iii) for female drivers; (iv) for very high (over 65 mph) and very low (under 20 mph) speed limits; (v) at intersections; (vi) because...

  18. Kas Eesti avastamine algab Põhja-Eestist? : Põhja-Eesti V turismikonverents

    Index Scriptorium Estoniae

    2010-01-01

    17. novembril Jõhvi Kontserdimajas toimunud Põhja-Eesti V turismikonverentsist “Kas Eesti avastamine algab Põhja- Eestist?", mille avas Ida-Virumaa maavalitsuse Arengu- ja planeeringuosakonna juhataja Urmas Majaääs. Ülevaade SA Ida-Virumaa Ettevõtluskeskuse turismikoordinaatori Sigrid Karoni, Estonian Airi asepresidendi kommertsalal Rauno Parrase, EASi koordinaatori turismiuuringute alal Piret Kallase, kommunikatsioonikonsultandi Raul Rebase, SA Põhja-Eesti Turism projektijuhi Erika Pääbuse ja nõukogu liikme Moonika Sooneste, CityBike OÜ tegevjuhi Toomas Lelovi, Narva-Jõesuu linnapea Andres Noormägi, Loodusturismi arendaja ja koolitaja Rein Kuresoo ettekannetest

  19. Developing a Formal Specification for the Mission Systems of a Maritime Surveillance Aircraft

    DEFF Research Database (Denmark)

    Petrucci, Laure; Billington, Jonathan; Kristensen, Lars Michael;

    2003-01-01

    The mission system of an aircraft is a complex real-time distributed system consisting of a mission control computer, different kinds of devices interconnected by a number of serial data buses. The complexity and real-time requirements of mission systems have motivated research into the application...... system with Coloured Petri Nets and analysed the model using state spaces. Here, we describe how this model was refined and modified to obtain a Coloured Petri Net model for the AP-3C Orion maritime surveillance aircraft....

  20. Development of a Multi‐bus platform for automation testbed

    OpenAIRE

    Isaksson, Mathias; Knapik, Lukas

    2010-01-01

    The task for this thesis was to develop, construct and evaluate a multi‐bus communication system,connected to a PC via USB and capable of communicating in CAN, I2C and SPI and develop drivers for itin National Instruments LabVIEW.In the beginning a study was made of the communication buses followed by an investigation of whattype of hardware that could accomplish this task. A microcontroller unit was selected andprogrammed in MikroElektronika MikroC Pro v.3.2 to act as the interface between t...

  1. A Heuristic Algorithm for optimizing Page Selection Instructions

    CERN Document Server

    Li, Qing'an; Chen, Yong; Wu, Wei; Xu, Wenwen

    2010-01-01

    Page switching is a technique that increases the memory in microcontrollers without extending the address buses. This technique is widely used in the design of 8-bit MCUs. In this paper, we present an algorithm to reduce the overhead of page switching. To pursue small code size, we place the emphasis on the allocation of functions into suitable pages with a heuristic algorithm, thereby the cost-effective placement of page selection instructions. Our experimental results showed the optimization achieved a reduction in code size of 13.2 percent.

  2. A Decision Support Tool for Transient Stability Preventive Control

    DEFF Research Database (Denmark)

    Pertl, Michael; Weckesser, Tilman; Rezkalla, Michel M.N.

    2017-01-01

    The paper presents a decision support tool for transient stability preventive control contributing to increased situation awareness of control room operators by providing additional information about the state of the power system in terms of transient stability. A time-domain approach is used...... to assess the transient stability for potentially critical faults. Potential critical fault locations are identified by a critical bus screening through analysis of pre-disturbance steady-state conditions. The identified buses are subject to a fast critical contingency screening determining the actual....... The effectiveness of the proposed method is demonstrated on a standard nine-bus and the New England test system...

  3. Transient Stability Analysis Using Transmission Line Measurement

    Institute of Scientific and Technical Information of China (English)

    蔡国伟; 程浩忠; 陈家荣; 王承民

    2004-01-01

    The novel quantitative assessment method using transmission line measurement was developed. A new style of stability criterion was suggested which is based on the line measurement. The stability indices for lines,cutsets and power system according to features of transient energy in the lines were given, which not only provide a reliable and accurate assessment of the transient stability of power system, but also can be used to assess the effect of lines and cutsets on the transient stability and identify the weak transmission segment. Examples were presented by simulation on the IEEE-39 buses test system.

  4. Southern Nevada Alternative Fuels Demonstration Project

    Energy Technology Data Exchange (ETDEWEB)

    Hyde, Dan; Fast, Matthew

    2009-12-31

    The Southern Nevada Alternative Fuels Program is designed to demonstrate, in a day-to-day bus operation, the reliability and efficiency of a hydrogen bus operation under extreme conditions. By using ICE technology and utilizing a virtually emission free fuel, benefits to be derived include air quality enhancement and vehicle performance improvements from domestically produced, renewable energy sources. The project objective is to help both Ford and the City demonstrate and evaluate the performance characteristics of the E-450 H2ICE shuttle buses developed by Ford, which use a 6.8-liter supercharged Triton V-10 engine with a hydrogen storage system equivalent to 29 gallons of gasoline. The technology used during the demonstration project in the Ford buses is a modified internal combustion engine that allows the vehicles to run on 100% hydrogen fuel. Hydrogen gives a more thorough fuel burn which results in more power and responsiveness and less pollution. The resultant emissions from the tailpipe are 2010 Phase II compliant with NO after treatment. The City will lease two of these E-450 H2ICE buses from Ford for two years. The buses are outfitted with additional equipment used to gather information needed for the evaluation. Performance, reliability, safety, efficiency, and rider comments data will be collected. The method of data collection will be both electronically and manually. Emissions readings were not obtained during the project. The City planned to measure the vehicle exhaust with an emissions analyzer machine but discovered the bus emission levels were below the capability of their machine. Passenger comments were solicited on the survey cards. The majority of comments were favorable. The controllable issues encountered during this demonstration project were mainly due to the size of the hydrogen fuel tanks at the site and the amount of fuel that could be dispensed during a specified period of time. The uncontrollable issues encountered during this

  5. Standardization Boosts the Development ofCHANGAN AUTOMOBILE

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    In the past two decades,CHANGAN AUTOMOBILE has been sticking to its core value of "technology innovation and consistent care" and dedicating to lead the automobile culture by technology innovation.Till now,it has a complete product range of micro vehicles,passenger cars,buses,trucks,SUV,MPV,etc.,and engineplatforms ranging from 0.8L to 2.5L.CHANGAN AUTOMOBILE brand output ranked 13th in the world and first in China in 2009.Its brand value reached 30.515 billion RMB in 2011,among most valuable brands in China.

  6. Photonic Integrated Circuits

    Science.gov (United States)

    Krainak, Michael; Merritt, Scott

    2016-01-01

    Integrated photonics generally is the integration of multiple lithographically defined photonic and electronic components and devices (e.g. lasers, detectors, waveguides passive structures, modulators, electronic control and optical interconnects) on a single platform with nanometer-scale feature sizes. The development of photonic integrated circuits permits size, weight, power and cost reductions for spacecraft microprocessors, optical communication, processor buses, advanced data processing, and integrated optic science instrument optical systems, subsystems and components. This is particularly critical for small spacecraft platforms. We will give an overview of some NASA applications for integrated photonics.

  7. Modified Approach for Harmonic Reduction in Transmission System Using 48-pulse UPFC Employing Series Zig-Zag Primary and Y-Y Secondary Transformer

    OpenAIRE

    Ragini Malviya; Rakesh Kumar Saxena

    2013-01-01

    In this paper THD (Total Harmonic Distortion) is analysed and compared by using UPFC in a multi-line transmission system of 500 KV having 5-buses in two different arrangements. The UPFC converters are arranged as a Diode Clamped multilevel Converter (DCMLC) that leads to the cost reduction as compared with other multi-level converters. The comparison has been done by both series zig-zag/2Y-2Δ and series zig-zag/4Y transformer configuration for 48-pulses GTO based diode clamped converter. The ...

  8. Curitiba: Towards sustainable urban development

    Energy Technology Data Exchange (ETDEWEB)

    Rabinovitch, J.

    1995-12-31

    Curitiba is best known for its innovative public transport system based on buses but this is only one among many initiatives which have improved the environment and quality of life in the city, limited pollution and waste and reduced resource use. The public transport system has also been complemented by comprehensive initiatives in planning and land use management. This paper describes not only the development of the public transport system but also the planning and administrative framework that was needed to make it, and other initiatives taken in Curitiba, effective.

  9. Estimated United States Transportation Energy Use 2005

    Energy Technology Data Exchange (ETDEWEB)

    Smith, C A; Simon, A J; Belles, R D

    2011-11-09

    A flow chart depicting energy flow in the transportation sector of the United States economy in 2005 has been constructed from publicly available data and estimates of national energy use patterns. Approximately 31,000 trillion British Thermal Units (trBTUs) of energy were used throughout the United States in transportation activities. Vehicles used in these activities include automobiles, motorcycles, trucks, buses, airplanes, rail, and ships. The transportation sector is powered primarily by petroleum-derived fuels (gasoline, diesel and jet fuel). Biomass-derived fuels, electricity and natural gas-derived fuels are also used. The flow patterns represent a comprehensive systems view of energy used within the transportation sector.

  10. Data acquisition and monitoring for the KLOE detector

    Energy Technology Data Exchange (ETDEWEB)

    Aloisio, A.; Ambrosino, F.; Antonelli, M.; Bini, C.; Bocci, V.; Bossi, F.; Branchini, P.; Cabibbo, G.; Caloi, R.; Cardini, A.; Casarsa, M.; Cataldi, G.; Cavaliere, S.; Cevenini, F.; Ciambrone, P.; De Lucia, E.; De Robertis, G.; De Simone, P.; Dell' Agnello, S.; Denig, A.; Di Domenico, A.; Di Donato, C.; Di Falco, S.; Doria, A.; Ferrari, A.; Ferrer, M.L. E-mail: ferrer@lnf.infn.it; Finocchiaro, G.; Fiore, D.; Forti, C.; Gatti, C.; Gauzzi, P.; Giovannella, S.; Gorini, E.; Grandegger, W.; Graziani, E.; Guarnaccia, P.; Incagli, M.; Kuo, C.; Lanfranchi, G.; Lee-Franzini, J.; Martemianov, M.; Martini, A.; Mei, W.; Merola, L.; Messi, R.; Miscetti, S.; Moulson, M.; Mueller, S.; Murtas, F.; Pacciani, L.; Palutan, M.; Pasqualucci, E.; Passalacqua, L.; Passaseo, M.; Passeri, A.; Pelucchi, F.; Picca, D.; Pirozzi, G.; Pontecorvo, L.; Primavera, M.; Santangelo, P.; Santovetti, E.; Saracino, G.; Sciascia, B.; Sfiligoi, I.; Shan, J.; Spadaro, T.; Spiriti, E.; Stanescu, C.; Tortora, L.; Valente, E.; Valente, P.; Valeriani, B.; Venanzoni, G.; Veneziano, S.; Ventura, A.; Zhou, Y

    2004-01-11

    The Data Acquisition system for the KLOE experiment, presently running at the Laboratori Nazionali di Frascati DAPHINE collider, has been designed to sustain an acquisition throughput of 50 Mbyte/s for an event rate of 10 kHz. Its two major components are the front end data readout, based on custom buses, and a complex network of computers and storage devices hosting a set of distributed processes. The end result is a seamless data transport from the readout system to the storage library, accompanied by concurrent on line calibrations and data quality control.

  11. Emergency Flight Control Using Computer-Controlled Thrust

    Science.gov (United States)

    Burcham, Frank W., Jr.; Fullerton, C. Gordon; Stewart, James F.; Gilyard, Glenn B.; Conley, Joseph A.

    1995-01-01

    Propulsion Controlled Aircraft (PCA) systems are digital electronic control systems undergoing development to provide limited maneuvering ability through variations of individual engine thrusts in multiple-engine airplanes. Provide landing capability when control surfaces inoperable. Incorporated on existing and future airplanes that include digital engine controls, digital flight controls, and digital data buses, adding no weight for additional hardware to airplane. Possible to handle total failure of hydraulic system, depending on how surfaces respond to loss of hydraulic pressure, and broken control cables or linkages. Future airplanes incorporate data from Global Positioning System for guidance to any suitable emergency runway in world.

  12. Mobile technology

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2002-12-01

    This article describes how a fuel cell works, and reports on the introduction of Mercedes-Benz Citaro fuel cell buses in major European cities. The advantages of hydrogen gas as a fuel are highlighted, and the three electric propulsion systems, namely the battery-powered, the hybrid battery and internal combustion engine, and the fuel cell powered systems are discussed. Details are given of the increased efficiency of fuel cells compared with internal combustion engines, their simple construction, problems due to the use of hydrogen fuel, and the methanol fueled Daimler-Chrysler prototype car.

  13. Route optimization of urban public transportation

    OpenAIRE

    PATRICIA JARAMILLO-ÁLVAREZ; GONZÁLEZ-CALDERÓN, CARLOS A.; GUILLERMO GONZÁLEZ-CALDERÓN

    2013-01-01

    Este artículo muestra el proceso de optimización de rutas de transporte público urbano basado en las técnicas de investigación de operaciones. Éste muestra en el contorno del desarrollo e importancia de la planifi cación del transporte público colectivo, sus etapas, diseño y modelos. Se presenta el diseño de redes de rutas de buses donde se muestran las generalidades y antecedentes de los modelos de optimización aptos para el sistema de transporte público colectivo. Se desarrolla un modelo de ...

  14. Development of fiber optic data bus for aircraft

    Science.gov (United States)

    Komouchi, Yutaka; Sueoka, Akira

    1988-02-01

    An account is given of the design, construction, and both ground and flight testing of a star-coupled fiber-optic data bus consisting of an optic coupler, fibers, a connector, and a transmitter/receiver. This system precludes spark/fire hazards and crosstalk problems, while offering very small size and weight for a given capability. The communication protocol for the data bus is of 1 Mbit/sec command response type, and its design attempted to minimize the effect on electronic interfaces as a result of conversion from electrical to fiber-optic buses.

  15. Improvement of Brake System of Yutong Bus%字通客车制动系统改进探究

    Institute of Scientific and Technical Information of China (English)

    张希望; 杨正中; 蒋清莲

    2012-01-01

    针对宇通客车经过多年使用后出现的刹车不良或失效进行探究,提出在制动系统加装一个空气干燥器的改进方案,效果良好。%After use of Yutong Buses many years, the authors make study on the bad brakes or failure and put for- ward the braking system with an air dryer improvement program. The results are good.

  16. Automatic Voltage Control (AVC) of Danish Transmission System - Concept design

    DEFF Research Database (Denmark)

    Qin, Nan; Abildgaard, Hans; Lund, P.

    2014-01-01

    , objectives, constraints, algorithms for optimal power flow and some special functions in particular systems, which inspires the concept design of a Danish AVC system to address the future challenges of voltage control. In the concept, the Danish AVC design is based on a centralized control scheme. All...... the buses are monitored where the voltage magnitudes are maintained continually. The loss minimization including switching cost is the objectives of the AVC system. The reactive power reserves as constraints are taken into account to limit the regulation capabilities of generators. The Day ahead and short...

  17. Propuesta de una arquitectura empresarial para una empresa de transporte terrestre de pasajeros

    OpenAIRE

    Sánchez Rodríguez, Cristian Andrés

    2015-01-01

    "Desde tiempo atrás Colombia viene teniendo grandes problemas con el sistema de transporte urbano y rural, lo que afecta notablemente la calidad de vida de los habitantes de cierto sector en particular, el transporte público en Colombia es considerado ineficiente, inseguro, contaminante, entre otras. Las calles de las ciudades colombianas y los corredores viales intermunicipales están pobladas de buses obsoletos que funcionaban sin tener en cuenta la seguridad pública, la contaminación y el o...

  18. The impact of governance modes on sustainable transport - the case of bus transport in Greater Manchester, UK

    DEFF Research Database (Denmark)

    Sørensen, Claus Hedegaard; Gudmundsson, Henrik

    2010-01-01

    on how the transport sector is organised and governed. In this paper, we study the impacts of new public management (NPM) reforms in the British local transport sector on the attraction of passengers to buses. Britain is an interesting example since high level sustainable transport policies have been...... pursued in a deregulated context. We focus on bus transport in Greater Manchester as the case in point. First, we study the effects of the NPM reforms on modal shift. We find that the reforms generally have contributed to a decline in bus passengers, while some reform elements have made positive...

  19. Early Prevention Method for Power Systems Instability

    DEFF Research Database (Denmark)

    Dmitrova, Evgenia

    a given operational conditions and predicts the resulting stability margins for the new steady state, while avoiding time consuming time domain simulations. The method has been validated on the Western Danish power system model, containing 464 buses. The case study of aperiodic small signal angular....... The predicted effect of the suggested countermeasure application is in a good agreement with the results obtained by RMS dynamic simulation. Developed method enables adaptive preventive control for near real-time stability maintenance. The achieved results are opening promising perspective for power system’s...... evolution to self-curing systems, for which the human factor involved in control, will keep diminishing....

  20. Statistical Analysis for the Driving Cycle of Beijing's Bus

    Institute of Scientific and Technical Information of China (English)

    王震坡; 孙逢春; 王军; 孙立清

    2004-01-01

    According to the test data of the driving model for Beijing's bus routes, 9 parameters and the actual values of Beijing bus are confirmed to evaluate the driving cycle, 2 ways of establishing driving cycle model are analyzed, the formula of calculating driving cycle is acquired, and the calculating driving cycle model and the statistical driving cycle model for the buses in Beijing urban areas are set up. This study provides scientific basis for selecting the bus type and confirming the design parameters and the running method in Beijing.

  1. High-precision gauging of metal rings

    Science.gov (United States)

    Carlin, Mats; Lillekjendlie, Bjorn

    1994-11-01

    Raufoss AS designs and produces air brake fittings for trucks and buses on the international market. One of the critical components in the fittings is a small, circular metal ring, which is going through 100% dimension control. This article describes a low-price, high accuracy solution developed at SINTEF Instrumentation based on image metrology and a subpixel resolution algorithm. The measurement system consists of a PC-plugg-in transputer video board, a CCD camera, telecentric optics and a machine vision strobe. We describe the measurement technique in some detail, as well as the robust statistical techniques found to be essential in the real life environment.

  2. Aplicación del entorno de programación Labview a la enseñanza de protocolos de comunicaciones industriales

    OpenAIRE

    Moreno Cava, Miguel; Jiménez Buendía, Manuel; Vera Repullo, José Alfonso

    2000-01-01

    La aparición de buses de comunicación dedicados específicamente al control industrial está teniendo un impacto cada vez mayor en el campo de la automatización. Para facilitar la docencia en este campo, se propone un conjunto de aplicaciones desarrolladas en el entornode programación Labview, que posibilitan la configuración de un sistema de comunicación completo, integrando protocolos y redes de control de bajo nivel (RS845 con protocolo Modbus) con otras de nivel superior (LAN y WAN basadas ...

  3. Technology priorities for transport in Asia: assessment of economy-wide CO2 emissions reduction for Lebanon

    DEFF Research Database (Denmark)

    Dhar, Subash; Marpaung, Charles O. P.

    2015-01-01

    of technologies and availability of technology characteristics. Non-motorized transport, mass transit and technologies that improve vehicle energy efficiency emerged as the three most preferred technology choices for the countries. These technology choices can be appropriate candidates for nationally appropriate......,improvement to cars (private and taxis) and buses for public transport were prioritized by stakeholders. The economy-wide CO2 emission reduce by 2,269 thousand tons by 2020 if the prioritized technologies are implemented in Lebanon. Fuel mix effect and structural effect would reduce CO2 emission by 2,611 thousand...

  4. Design and Spice Simulation of Coupling Circuits for Powerline Communications Onboard Spacecraft

    Science.gov (United States)

    Grassi, F.; Pignari, S. A.; Wolf, J.

    2012-05-01

    This paper deals with the design of coupling/decoupling circuits for application of the powerline communications (PLC) technology to spacecraft power buses. Particularly, the objective of this work is to investigate possible advantages deriving from connecting the PLC modems in series with the powerline (PL) instead of resorting to a parallel connection scheme. To this end, the channel frequency response and signal-to-noise ratio of the resulting PLC link are obtained by SPICE simulation in the frequency interval 1-20 MHz. Suitable design rules, aimed at optimizing transmission performance and warranting satisfactory immunity of the PLC link to the conducted noise affecting the PL, are derived and discussed.

  5. Cooperative Control of Active Power Filters in Power Systems without Mutual Communication

    Directory of Open Access Journals (Sweden)

    Josef Tlustý

    2010-01-01

    Full Text Available The procedure for calculating controller parameters of the APFs implemented into a multibus industrial power system for harmonic voltage mitigation is presented. The node-voltage-detection control strategy is applied and the basic controller parameters are found under the condition that the demanded THD factors at the buses where the APFs are placed will be obtained. A cooperative control of several APFs without mutual communication is proposed, simulated, and experimentally verified. By tuning the controller gains without considering the power circuit parameters, all APFs used tend to share harmonic load currents approximately equally regardless of the operation modes of the nonlinear loads in different parts of the power system.

  6. Mejoramiento de la competitividad en Lima Norte con la reducción del caos vehicular, implementando un terminal terrestre interprovincial con interconexión vial futura al metro de Lima y corredor complementario

    OpenAIRE

    Avila Nuñez, Guiselle Melissa; Castañeda Del Castillo, Luis Fernando; Minaya Rosario, Carlos Danilo; Orihuela Aguilar, Overton Christian

    2017-01-01

    Propone mejorar la competitividad de la zona de Lima Norte como parte de Lima Metropolitana, con la construcción de un Terminal Terrestre al norte de la ciudad de Lima ubicado en el distrito de Puente Piedra. Teniendo como función principal la restricción del transporte de los buses interprovinciales por Lima Centro y a la vez descongestionar la zona de Lima Norte en las denominadas horas puntas por las mañanas y las noches, desde la zona del distrito de Puente Piedra hasta la Av. Eduardo de...

  7. Research on Installation Technology of Bus LNG Supply System%LNG客车供气系统安装技术研究

    Institute of Scientific and Technical Information of China (English)

    蒋黎明

    2011-01-01

    By arrangement, to buses. studying on cylinder type, cylinder specification, supplying system, LNG cylinder and its related parts evacuation and evacuation protection of LNG, the author discusses the technology of LNG application%通过对LNG气瓶类型、气瓶配置、供气系统、气瓶及相关部件的布置、排空与排空保护研究,介绍LNG在客车上的应用技术。

  8. Sequential feasible optimal power flow in power systems

    Institute of Scientific and Technical Information of China (English)

    HAN ZhenXiang; JIANG QuanYuan; CAO YiJia

    2009-01-01

    A sequential feasible optimal power flow (OPF) method is developed for large-scale power systems. One of the outstanding features of this method is that it can maintain feasibility for both equality and inequality constraints during iterations. In sequential feasible OPF, every iteration consists of two stages: Objective improving stage and feasibility enforcing stage. Analytical basis for each stage is provided. Numerical studies on various power systems up to 2383 buses indicate that the proposed feasible approach is promising. Compared with the conventional OPF algorithms, such as interior point method, the proposed sequential feasible OPF approach can be terminated at any iteration and yield a feasible operating point simultaneously.

  9. Analyzing the Effect of Passenger-Requested Unscheduled Stops on Demand

    Directory of Open Access Journals (Sweden)

    Dejan Paliska

    2007-07-01

    Full Text Available This paper discusses the effect of unscheduled stops requestedby passengers on bus transit demand and presents theresults of its study. In the research a set of regression modelsthat estimate the route-level demand were developed using datacollected with Automatic Passenger Counters and AutomaticVehicle Location systems installed on buses, and demographic,socio-economic and land use information from other sources.The results obtained indicate that the number of rider-requestedunscheduled stops have no significant effect on demand,suggesting that the company policy which tolerates unscheduledstops is inadequate for attracting new riders.

  10. Voltage stability and controllability indices for multimachine power systems

    Energy Technology Data Exchange (ETDEWEB)

    Vournas, C.D. [National Technical Univ., Athens (Greece). Electrical Energy Systems Lab.

    1995-08-01

    This paper presents a voltage stability index (VSI) and a voltage controllability index (VCI), related to the eigenvalues of mxm matrices in a multimachine power system made up of m synchronous generators and a number of infinite buses. System loads can have an arbitrary voltage sensitivity described by generalized voltage exponents. These nonlinear loads are linearized around an operating point and incorporated into a modified admittance matrix, which is subsequently reduced to the generator terminals using an efficient algorithm and sparsity techniques. The indices proposed are tested in a practical system and it is demonstrated that they provide a timely warning during a sequence of events leading to voltage collapse.

  11. A Reduced-Part, Triple-Voltage DC-DC Converter for EV/HEV Power Management

    Energy Technology Data Exchange (ETDEWEB)

    Su, Gui-Jia [ORNL; Tang, Lixin [ORNL

    2009-01-01

    Electrical power systems in future hybrid and fuel cell vehicles may consist of three voltage nets: 14 V, 42 V, and high voltage (>200 V) buses. A soft-switched, bidirectional dc-dc converter that uses only four switches was proposed for interconnecting the three nets. This paper presents a reduced-part dc-dc converter, which decreases the converter cost while retaining all the favorable features of the original topology. Experimental data are included to verify a simple power flow control scheme.

  12. A Reduced-Part, Triple-Voltage DC-DC Converter for Electric Vehicle Power Management

    Energy Technology Data Exchange (ETDEWEB)

    Su, Gui-Jia [ORNL; Tang, Lixin [ORNL

    2007-01-01

    Electrical power systems in future hybrid and fuel cell vehicles may consist of three voltage nets; 14 V, 42 V and high voltage (>200 V) buses. A soft-switched, bi-directional dc-dc converter using only four switches was proposed for interconnecting the three nets. This paper presents a reduced- part dc-dc converter, which decreases the converter cost while retaining all the favorable features of the original topology. Simulation and experimental data are included to verify a simple power flow control scheme.

  13. An adaptive large neighborhood search heuristic for the Electric Vehicle Scheduling Problem

    DEFF Research Database (Denmark)

    Wen, M.; Linde, Esben; Røpke, Stefan;

    2016-01-01

    This paper addresses the Electric Vehicle Scheduling Problem (E-VSP), in which a set of timetabled bus trips, each starting from and ending at specific locations and at specific times, should be carried out by a set of electric buses or vehicles based at a number of depots with limited driving...... ranges. The electric vehicles are allowed to be recharged fully or partially at any of the given recharging stations. The objective is to firstly minimize the number of vehicles needed to cover all the timetabled trips, and secondly to minimize the total traveling distance, which is equivalent...

  14. Drivetrain system of an ultracapacitor electric bus

    Institute of Scientific and Technical Information of China (English)

    Kong Zhigu; Zhu Chunbo; Yang Shiyan; Cheng Shukang

    2007-01-01

    This paper proposed a design of the drivetrain system of an electric bus with ultracapacitor (UC) as the only on-board power source. The system includes three main parts, namely, UC bank, motor and the converter, vehicle management unit (VMU). Analyses results in detail on the functional design and experiments on work bench of each part were also presented, which validated the reliability of the system. Furthermore, driving results in field of the bus verified the feasibility of the design of the drivetrain system. The bus has very good dynamic performances and shows a promising applications prospect in the short and medium route buses system.

  15. 8. annual U.S. hydrogen meeting: Proceedings

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1997-01-01

    The proceedings contain 35 papers arranged under the following topical sections: Government`s partnership role for hydrogen technology development; Government/industry partnerships -- Demonstrations; Entering the market -- Partnerships in transportation; Hydrogen -- The aerospace fuel; Codes and Standards; Advanced technologies; and Opportunities for partnerships in the utility market. Of the three markets identified (transportation, power production, and village power) papers are presented dealing with the first two. Three parts of the transportation market were covered: cars, trucks, and buses. Progress was reported in both fuel cell and internal combustion engine vehicle propulsion systems. Selected papers have been indexed separately for inclusion in the Energy Science and Technology Database.

  16. Decrease in the damage of powerful turbogenerator stator caused by vibration in the end zones (analysis, hypotheses, experiment

    Directory of Open Access Journals (Sweden)

    Yu.A. Shumilov

    2014-03-01

    Full Text Available The analysis of the turbogenerators’ TВВ-1000-2Y3 failure has shown that the most vulnerable link in the stator is such of their elements as tightening prisms, the teeth of the end packet core, lead-out and connecting buses of the stator winding. The basic reason for the destruction of the elements mentioned is metal fatigue caused by excessive vibration under the influence of variable axial forces of electromagnetic origin. Preventing the destruction of the structural elements may be achieved by vibration monitoring and diagnostics.

  17. Diagnosis of TIG welding based on ultraviolet radiation

    Institute of Scientific and Technical Information of China (English)

    Li Zhiyong; Gu Xiaoyan; Wang Bao

    2009-01-01

    Through collecting the radiation of tungsten inert gas (TIG) welding arc, the radiation distribution in ultraviolet zone is analyzed in order to study the variation rule of ultraviolet radiation versus welding condition. The explanation for the variation is also provided bused on spectral radiation theory of arc light. Furthermore, through analysis of disturbanee factors, the integral intensity signal of radiation in ultraviolet zone is applied for diagnosis of welding process. The spectral signal of ultraviolet radiation can reflect the disturbance factors and welding conditions, which can be used for online diagnosis of welding process.

  18. Instant Apache Camel messaging system

    CERN Document Server

    Sharapov, Evgeniy

    2013-01-01

    Get to grips with a new technology, understand what it is and what it can do for you, and then get to work with the most important features and tasks. A beginner's guide to Apache Camel that walks you through basic operations like installation and setup right through to developing simple applications.This book is a good starting point for Java developers who have to work on an application dealing with various systems and interfaces but who haven't yet started using Enterprise System Buses or Java Business Integration frameworks.

  19. Aero particles characterization emitted by mobile sources;Caracterizacion de aeroparticulas emitidas por fuentes moviles

    Energy Technology Data Exchange (ETDEWEB)

    Rojas V, A.; Romero G, E. T.; Lopez G, H., E-mail: elizabeth.romero@inin.gob.m [ININ, Departamento de Quimica, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2009-07-01

    In our country, the mobile sources that conform most of the emissions at the atmosphere, are concentrated on the urban areas. For the present work, samples coming from the escapes of terrestrial transport were obtained, such as: passenger buses, load transport and particular vehicles of the Metropolitan area of the Toluca valley. The material was analyzed by means of scanning electron microscopy of low vacuum and X-ray diffraction. The objective was to characterize the emitted particles by mobile sources, morphological and chemically to know the structure, size and elements that compose them. (Author)

  20. The automotive transmission book

    CERN Document Server

    Fischer, Robert; Jürgens, Gunter; Najork, Rolf; Pollak, Burkhard

    2015-01-01

    This book presents essential information on systems and interactions in automotive transmission technology and outlines the methodologies used to analyze and develop transmission concepts and designs. Functions of and interactions between components and subassemblies of transmissions are introduced, providing a basis for designing transmission systems and for determining their potentials and properties in vehicle-specific applications: passenger cars, trucks, buses, tractors, and motorcycles. With these fundamentals the presentation provides universal resources for both state-of-the-art and future transmission technologies, including systems for electric and hybrid electric vehicles.