WorldWideScience

Sample records for bohunice v-2 reactor

  1. Risk monitor for unit 3 of the Jaslovske Bohunice V2 nuclear power plant at the full power and for the shut-down reactor

    International Nuclear Information System (INIS)

    The EOOS (Equipment Out Of Service) Monitor is part of the Risk and Reliability Workstation software package developed by EPRI. The software package was provided to the Jaslovske Bohunice NPP and the Slovak Nuclear Regulatory Authority within a contract with the US Department of Energy (DOE). A risk monitor for unit 3 of the Jaslovske Bohunice V2 NPP was developed by integration of a PSA model into the EOOS monitor. The paper describes the monitor and its application to risk monitoring during full power operation and reactor shutdown. (author)

  2. Modernization and safety improvement project of the NPP V-2 Jaslovske Bohunice

    International Nuclear Information System (INIS)

    The contribution deals with form, present state and results of Nuclear Power Plants Research Institute (the Slovak acronym is VUJE - Vyskumny Ustav Jadrovych Elektrarni) participation in the NPP V-2 Jaslovske Bohunice Modernization and Safety Improvement Project. Short description of VUJE history, activity and results is also done as well as NPPs Jaslovske Bohunice characterization. (authors)

  3. Bohunice V-1 and V-2 approach for achieving high availability, reliability and safety

    International Nuclear Information System (INIS)

    Long term operating experience of Bohunice units maintenance activities are overviewed in the paper. Based on common experience of WWER NPP operators, separate maintenance department was established at Bohunice NPP in very early stage of plant operation. Maintenance management, maintenance planning, outage management, diagnostics and monitoring, inspection technologies and backfitting activities are described particularly to demonstrate the capability of Bohunice maintenance department for most complex repairs and maintenance works of nuclear power plant components and equipment, including reactor and turbine itself. (author)

  4. Modernization of Nuclear Power Plant V2 Bohunice in Slovak Republic

    International Nuclear Information System (INIS)

    After successful completion of extensive Gradual Reconstruction (1996-2000) of Nuclear Power Plant V1 (2 x VVER440/V230), there started modernisation project of Nuclear Power Plant V2 (2 x VVER440/V213) in the site Jaslovske Bohunice with planned completion in the year 2008. The main goal and priority of NPP V2 modernisation programme is to increase safety and reliability of the operation, but also to create conditions for extension of the operating life and economy improvement of NPP V2 operation. NPP V2 units in Jaslovske Bohunice were commissioned in the year 1984 and 1985. In the year 1997, management of Slovenske Elektrarne approved goals of modernisation programme and safety increasing of NPP V2. At modernisation programme defining, there were taken into consideration results of safety assessment and recommendations for improvement of NPP with VVER 440/V213 processed within the projects IAEA, WANO, VUJE and the other organisations which have had experiences with the operation of NPP with VVER reactors (basic documents: Safety report NPP V2 after 10 years of operation, VUJE, 1993, Safety issue and their ranking for nuclear power plants WWER 440/V213 type, IAEA, 1996, Safety improvements of NPP V2 and design of their solution, VUJE, 1997). Detail range, content and schedule of programme implementation were elaborated by VUJE in the year 2001. VUJE worked out solution designs into the level of project requirements (Conceptual Design) in the document: 'Safety concept for modernisation and safety increasing of NPP V2' Modernisation works are implemented mainly in I and C and electro part, works in nuclear systems and the civil part are implemented in smaller range. Implementation works in modernisation project are realized mainly during planned units outages for refuelling. VUJE as the general designer provides elaboration of design documentation, safety documentation; support of general contractor and it is responsible for overall coordination and functionality

  5. MELCOR Comparative Analyses of Severe Accident of Medium LOCA for the NPP V2 Bohunice

    International Nuclear Information System (INIS)

    This paper presents the results of safety analysis of a medium LOCA (break size 100 mm in cold leg) for the V2 Bohunice nuclear power plant (VVER-440/V-213), and compares the results calculated by various computer codes (MELCOR, MAAP, RELAP/SCADAP). The analysis is performed within the SWISSLOVAK project by the safety analysis group at the Nuclear Regulatory Authority of the Slovak Republic. The medium LOCA accident is combined with station blackout scenario which leads to the core uncovery and meltdown of the reactor core. The core meltdown is followed by the core relocation to the lower plenum, heat up of the reactor pressure vessel lower head, failure of the lower head, and debris ejection into the reactor cavity. The time of key events calculated by various computer codes is similar. The start of core melt is predicted within 0.8 to 1.08 hours and the reactor pressure vessel lower head failure is predicted within 4.1 to 6.3 hours since the initiation of the accident. A substantial release of noble gases to the environment through the permanent containment leakage is calculated. The compartmentalization of the containment and the presence of the bubble condenser affect the release of the fission products. (author)

  6. ESTE EMO and ESTE EBO - emergency response system for NPP Mochovce and NPP Bohunice V-2

    International Nuclear Information System (INIS)

    Programs ESTE EMO and ESTE EBO are emergency response systems that help the crisis staff of the NPP in assessing the source term (predicted possible release of radionuclides to the atmosphere ), in assessing the urgent protective measures and sectors under threat, in assessing real release (symptoms of release really detected and observed), in calculating radiological impacts of real release, averted or avertable doses, potential doses and doses during transport or evacuation on specified routes. Both systems serve as instruments in case of severe accident (DBA or BDBA) at NPP Mochovce or NPP Bohunice, accidents with threat of release of radioactivity to the atmosphere. Systems are implemented at emergency centre of Mochovce NPP and Bohunice NPP and connected online to the sources of technological and radiological data from the reactor, primary circuit, confinement, secondary circuit, ventilation stack, from the area of NPP (TDS 1) and from the emergency planning zone (TDS 11). Systems are connected online to the sources of meteorological data, too. (authors)

  7. Information about influence of the Bohunice V-2 NPP on the environment, August 2008

    International Nuclear Information System (INIS)

    In this paper results of monitoring of chemical gaseous and liquid effluents into the rivers Vah River as well as of radiation monitoring of Bohunice V-2 NPP are presented. The radioactive effluents into atmosphere within August 2008 were: 2.72 MBq of aerosols, 0.052 MBq of of iodine-131, and 537 GBq of rare gases. For the period January - August 2008 these radioactive effluents into recipient of Vah River represented 6.66 MBq (0.318% of annually limit (AL)) of aero-soles; 0.318 MBq (0.00049% of AL) of iodine-131 and 3341 GBq (0.172% of AL) of rare gases. The radioactive effluents into Vah River recipient within August 2008 were: 968.78 GBq of tritium and 1.35 MBq of corrosive and fission products. For the period January - August 2008 these radioactive effluents into Vah River recipient represented 3,233.51 GBq (16.1675% of AL) of tritium, and 13.50 MBq (0.104% of AL) of corrosive and fission products. Average dose equivalents rate for the villages in surroundings of the Bohunice V-2 NPP for the period from July 31 to September, 2008 are published. Chemical effluents are also reported

  8. Information about influence of the Bohunice V2 NPP on the environment, January 2008

    International Nuclear Information System (INIS)

    In this paper results of monitoring of chemical gaseous and liquid effluents into the Vah River as well as of radiation monitoring of Bohunice V2 NPP are presented. The radioactive effluents into atmosphere within January 2008 were: 0.19 MBq of aerosoles, 0.025 MBq of iodine-131, and 382 GBq of rare gases. For the period January 2008 these radioactive effluents into atmosphere represented 0.190 MBq (0.0002% of annually limit (AL)) of aerosoles, 0.025 MBq (0.00004 MBq of AL) of iodine-131, and 382 GBq (0.519% of AL) of rare gases. The radioactive effluents into recipient of Vah River within January 2008 were: 0.06 GBq of tritium, and 0.63 MBq of corrosive and fission products. For the period January 2008 these radioactive effluents into recipient of Vah River represented 0.06 GBq (0.0003% of AL) of tritium; 0.63 MBq (0.005% of AL) of corrosive and fission products. Dose equivalents rate for the villages in surroundings of the Mochovce NPP in January 2008 are published. Chemical effluents are also reported.

  9. Information about influence of the Bohunice V2 NPP on the environment, May 2008

    International Nuclear Information System (INIS)

    In this paper results of monitoring of chemical gaseous and liquid effluents into the Vah River as well as of radiation monitoring of Bohunice V2 NPP are presented. The radioactive effluents into atmosphere within May 2008 were: 0.29 MBq of aerosoles, 0.042 MBq of iodine-131, and 367 GBq of rare gases. For the period January - May 2008 these radioactive effluents into atmosphere represented 1.10 MBq (0.0014% of annually limit (AL)) of aerosoles, 0.159 MBq (0.00024% MBq of AL) of iodine-131, and 1.930 TBq (0.519% of AL) of rare gases. The radioactive effluents into recipient of Vah River within May 2008 were: 150.68 GBq of tritium, and 0.38 MBq of corrosive and fission products. For the period January - May 2008 these radioactive effluents into recipient of Vah River represented 855.43 GBq (4.2772% of AL) of tritium; 2.92 MBq (0.0226% of AL) of corrosive and fission products. Dose equivalents rate for the villages in surroundings of the Mochovce NPP in May 2008 are published. Chemical effluents are also reported.

  10. Information about influence of the Bohunice V2 NPP on the environment, February 2008

    International Nuclear Information System (INIS)

    In this paper results of monitoring of chemical gaseous and liquid effluents into the Vah River as well as of radiation monitoring of Bohunice V2 NPP are presented. The radioactive effluents into atmosphere within February 2008 were: 0.19 MBq of aerosoles, 0.025 MBq of iodine-131, and 344 GBq of rare gases. For the period January - February 2008 these radioactive effluents into atmosphere represented 0.37 MBq (0.0005% of annually limit (AL)) of aerosoles, 0.050 MBq (0.00008% MBq of AL) of iodine-131, and 725 GBq (0.036% of AL) of rare gases. The radioactive effluents into recipient of Vah River within February 2008 were: 100.01 GBq of tritium, and 0.61 MBq of corrosive and fission products. For the period January - February 2008 these radioactive effluents into recipient of Vah River represented 110.07 GBq (0.5504% of AL) of tritium; 1.24 MBq (0.010% of AL) of corrosive and fission products. Dose equivalents rate for the villages in surroundings of the Mochovce NPP in February 2008 are published. Chemical effluents are also reported.

  11. 2007 year - annual impacts of effluents in routine releases to the atmosphere and to the hydrosphere from NPP Bohunice V-2 evaluated by the code ESTE AI

    International Nuclear Information System (INIS)

    Annual impacts of Bohunice V -2 operation caused by effluents in routine releases during the year 2007 were calculated and evaluated first time with the help of completely new program - ESTE AI. Program is approved by the 'Public Health Authority of the Slovak Republic' and since January 2008 is used as legal instrument by Slovenske elektrarne a.s., NPP Bohunice. In this poster presented are annual effluents to the atmosphere and to the hydrosphere from Bohunice V-2 NPP. Presented, analyzed and discussed are main results of 2007 impacts evaluation. (authors)

  12. Bituminization plant Jaslovske Bohunice

    International Nuclear Information System (INIS)

    In this leaflet the principle of the bituminization plant for radioactive concentrate (the intermediate liquid radioactive waste generated during the NPP A1, V-1, V-2 operations) solidification used in the Bohunice Radwaste Treatment Centre (BSC RAO) is presented

  13. Thirtieth anniversary of reactor accident in A-1 Nuclear Power Plant Jaslovske Bohunice

    International Nuclear Information System (INIS)

    The facts about reactor accidents in A-1 Nuclear Power Plant Jaslovske Bohunice, Slovakia are presented. There was the reactor KS150 (HWGCR) cooled with carbon dioxide and moderated with heavy water. A-1 NPP was commissioned on December 25, 1972. The first reactor accident happened on January 5, 1976 during fuel loading. This accident has not been evaluated according to the INES scale up to the present time. The second serious accident in A-1 NPP occurred on February 22, 1977 also during fuel loading. This INES level 4 of reactor accident resulted in damaged fuel integrity with extensive corrosion damage of fuel cladding and release of radioactivity into the plant area. The A-1 NPP was consecutively shut down and is being decommissioned in the present time. Both reactor accidents are described briefly. Some radioecological and radiobiological consequences of accidents and contamination of area of A-1 NPP as well as of Manivier Canal and Dudvah River as result of flooding during the decommissioning are presented (authors)

  14. Design basis and design features of WWER-440 model 213 nuclear power plants. Reference plant: Bohunice V2 (Slovakia)

    International Nuclear Information System (INIS)

    The prime objective of the IAEA Technical Co-operation Project on Evaluation of Safety Aspects of WWER-440 model 213 NPPs is to co-ordinate and to integrate assistance to national organizations in studying selected aspects of safety for the same type of reactors. Consequently, the study integrated the results generated by national activities carried out in the Czech Republic, Hungary, Slovakia and Ukraine and co-ordinated through the IAEA. Valuable assistance in carrying out the tasks was also provided by Bulgaria and Poland. A set of publications is being prepared to present the results of the project. The publications are intended to facilitate the review and utilization of the results of the project. They are also providing assistance in further refinement and/or extension of plant specific safety evaluation of model 213 NPPs. This Technical Document addressing the design basis and safety related design features of WWER-440 model 213 plants is the first of the series to be published. It is hoped that this document will be useful to anyone working in the field of WWER safety, and in particular to experts planning, executing or reviewing studies related to the subject. Refs, 36 figs, tabs

  15. Safety enhancement in NPP Bohunice

    International Nuclear Information System (INIS)

    The upgrading and safety enhancement of both the Bohunice V-1 and V-2 reactors is described in detail. The total estimated cost of the gradual reconstruction of these two units during 1996 to 1999 is 180 mil. US dollars. For the 1995 to 1997 period, the actions common for both units include a quality assurance programme, a personnel training programme, installation of a multifunction simulator, implementation of symptom-oriented operation procedures, installation of diagnostic systems, of a site security system, and of a teledosimetric system. At present, the main maintenance tasks are: to carry out major repair of units, to remedy service interruptions, to enhance equipment service availability, to enhance the technical level of corrective actions at equipment. Investment into maintenance level upgrade has grown from 7.5 mil. Slovak crowns in 1994 to estimated 32 mil. in 2000. The partners of international cooperation are mentioned. (M.D.)

  16. Bohunice Nuclear Power Plant Safety Upgrading Program

    International Nuclear Information System (INIS)

    Bohunice nuclear Power Plant generation represents almost 50% of the Slovak republic electric power production. Due to such high level of commitment to nuclear power in the power generation system, a special attention is given to safe and reliable operation of NPPs. Safety upgrading and operational reliability improvement of Bohunice V-1 NPP was carried out by the Bohunice staff continuously since the plant commissioning. In the 1990 - 1993 period extensive projects were realised. As a result of 'Small Reconstruction of the Bohunice V-1 NPP', the standards of both the nuclear safety and operational reliability have been significantly improved. The implementation of another modifications that will take place gradually during extended refuelling outages and overhauls in the course of 1996 through 1999, is referred to as the Gradual Reconstruction of the Bohunice V-1 Plant. The general goal of the V-1 NPP safety upgrading is the achievement of internationally acceptable level of nuclear safety. Extensive and financially demanding modification process of Bohunice V-2 NPP is likely to be implemented after a completion of the Gradual Reconstruction of the Bohunice V-1 NPP, since the year 1999. With this in mind, a first draft of the strategy of the Bohunice V-2 NPP upgrading program based on Probabilistic Safety assessment consideration was developed. A number of actions with a general effect on Bohunice site safety is evident. All these activities are aimed at reaching the essential objective of Bohunice NPP Management - to ensure a safe, reliable and effective electric energy and heat generation at the Bohunice site. (author)

  17. Safety first. Nuclear power plant in Jaslovske Bohunice

    International Nuclear Information System (INIS)

    In this leaflet the production of electricity in nuclear power plants, philosophy of nuclear safety with reactor WWER, influence of ionization radiation on the man, improvement on the reactor, reconstructed system on the Bohunice V-1 reactors, nuclear reactor WWER, nuclear fuel and fission reaction, are described. A briefly history of Bohunice V-1 NPP is presented

  18. Results of reconstruction of in-core outlet coolant temperature measurements at V-230 reactors, Unit 1 and 2 NPP Bohunice

    International Nuclear Information System (INIS)

    During the reconstruction of NPP V 1 Bohunice units with V-230 reactors, all in-core temperature measuring systems were upgraded. All measuring channels including thermocouples up to data acquisition system were replaced. The report provides the objectives, process and results of the reconstruction. Accuracy and reliability of the in-core measurements were enhanced, and their resistance to accident environment was achieved. Moreover metrological assurance and automatic self-check of accuracy with the temperature etalon of reactor measurements were achieved. The obtained quality of the in-core temperature measurements exceeds that of similar systems in V-213 reactors. (Authors)

  19. Radwaste Treatment Centre Jaslovske Bohunice

    International Nuclear Information System (INIS)

    In this leaflet the Bohunice Radwaste Treatment Centre (BSC RAO) is presented. BSC RAO is designed to process and treat liquid and solid radwaste, arising from the NPP A-1 decommissioning, from NPPs V-1, V-2, and Mochovce operations, as well as institutional radwaste of diverse institutional (hospitals, research institutes) in the Slovak Republic. Transport, sorting, incineration, compacting, concentration and cementation of radwaste as well as monitoring of emission are described

  20. Lifetime evaluation of Bohunice NPP components

    International Nuclear Information System (INIS)

    The paper discuss some aspects of the main primary components lifetime evaluation program in Bohunice NPP which is performed by Nuclear Power Plant Research Institute (NPPRI) Trnava in cooperation with Bohunice and other organizations involved. Facts presented here are based on the NPPRI research report which is regularly issued after each reactor fuel campaign under conditions of project resulted from the contract between NPPRI and Bohunice NPP. For the calculations, there has been used some computer codes adapted (or made) by NPPRI and the results are just the conclusive and very brief, presented here in Tables (Figures). (authors)

  1. Experience from replacement and check of thermocouples during reconstruction of in-reactor temperature measurements at Bohunice V-1 units 1 and 2

    International Nuclear Information System (INIS)

    Replacement of thermocouples in the protection tube blocks was a key phase of the reconstruction of in-reactor temperature measurements at Bohunice V-1 with regard to the success, reliability and impact on safety of unit operation. The replacement consisted of reliable and safe withdrawal of 216 old thermocouples, their disposal and installation of new thermocouples into dry channels. In the material presented, this phase of reconstruction is described in details, with focus on the evaluation of replacement quality and check activities carried out at the new installed thermocouples. (Authors)

  2. 30th and 29th anniversary of reactor accidents in A-1 nuclear power plant Jaslovske Bohunice - radioecological and radiobiological consequences

    International Nuclear Information System (INIS)

    In this paper authors present facts about construction, operation and reactor accidents in A-1 Nuclear Power Plant Jaslovske Bohunice, Slovakia. There was the reactor KS 150 (HWGCR) cooled with carbon dioxide and moderated with heavy water. A-1 NPP was commissioned on December 25, 1972. The first reactor accident happened on January 5, 1976 during fuel loading. Two persons of personal died by suffocation with carbon dioxide. This accident has been not evaluated according to the INES scale up to present time. The second serious accident in A-1 NPP occurred in February 22, 1977 also during fuel loading. This INES level 4 of reactor accident resulted in damaged fuel integrity with extensive corrosion damage of fuel cladding and release of radioactivity into the plant area. The A-1 NPP was consecutively shut down and is being decommissioned in the present time. Both reactor accidents are described in this paper. Some radioecological and radiobiological consequences of accidents and contamination of area of A-1 NPP as well as of Manivier canal and Dudvah River as result of flooding during the decommissioning are presented. (authors)

  3. In-core-sipping in Jaslovske Bohunice

    International Nuclear Information System (INIS)

    The Siemens in-core sipping system has proved to work satisfactorily in the Jaslovske Bohunice Nuclear Power Station. In 1990, Siemens (KWU) installed a new version of the system advanced in the light of past operating experience, in which the rectangular eightfold bell had been replaced by rotationally symmetrical sevenfold bell. The number of failed fuel elements detected in the four generating units of the Jaslovske Bohunice Nuclear Power Station is relatively small, documenting reliable operation of the fuel elements in the WWER-440 reactor. (orig./HP)

  4. Seismic re-evaluation criteria for Bohunice V1 reconstruction

    International Nuclear Information System (INIS)

    Bohunice V1 in Slovakia is a Russian designed two unit WWER 440, Model 230 Pressurized Water Reactor. The plant was not originally designed for earthquake. Subsequent and ongoing reassessments now confirm that the seismic hazard at the site is significant. EBO, the plant owner has contracted with a consortium lead by Siemens AG (REKON) to do major reconstruction of the plant to significantly enhance its safety systems by the addition of new systems and the upgrading of existing systems. As part of the reconstruction, a complete seismic assessment and upgrading is required for existing safety relevant structures, systems and components. It is not practical to conduct this reassessment and upgrading using criteria applied to new design of nuclear power plants. Alternate criteria may be used to achieve adequate safety goals. Utilities in the U.S. have faced several seismic issues with operating NPPs and to resolve these issues, alternate criteria have been developed which are much more cost effective than use of criteria for new design. These alternate criteria incorporate the knowledge obtained from investigation of the performance of equipment in major earthquakes and include provisions for structures and passive equipment to deform beyond the yield point, yet still provide their essential function. IAEA has incorporated features of these alternate criteria into draft Technical Guidelines for application to Bohunice V1 and V2. REKON has developed plant specific criteria and procedures for the Bohunice V1 reconstruction that incorporate major features of the U.S. developed alternate criteria, comply to local codes and which envelop the draft IAEA Technical Guidelines. Included in these criteria and procedures are comprehensive walkdown screening criteria for equipment, piping, HVAC and cable raceways, analytical criteria which include inelastic energy absorption factors defined on an element basis and testing criteria which include specific guidance on interpretation

  5. Fuel reliability of Bohunice NPP

    International Nuclear Information System (INIS)

    Paper summarizes experience from last 15 years of operation at NPP Jaslovske Bohunice. During this period, leaking fuel assemblies have had been identified by in-core sipping method and verified by vendor specified canister sipping method. Methodology of operational and outage fuel integrity monitoring is described. Full survey of identified leaking assemblies is given. Fuel failure rates are calculated separately for V-1 (V-230 type) and V-2 (V-213 type) units. Systematic difference - significantly lower fuel failure rate at V-213 units exists for all period investigated. Analysis of potential fuel failure reasons and all related measures (planned and already implemented) are presented. Design, operation and fabrication features have been analyzed with the aim to identify dominant factors contributing to fuel failure. No unambiguous reasons have been found so far. It is believed that there is a superposition of several factors and differences causing higher failure rate at V-230 type units. (author)

  6. Fast breeder reactors: Experience and trends. V. 2

    International Nuclear Information System (INIS)

    The IAEA Symposium on ''Fast Breeder Reactors: Experience and Future Trends'' was held, at the invitation of the Government of France, in Lyons, France, on 22-26 July 1985. It was hosted by the French Commissariat a l'energie atomique and Electricite de France. The purpose of the Symposium was to review the experience gained so far in the field of LMFBRs, taking into account the constructional, operational, technological, economic and fuel cycle aspects, and to consider the developmental trends as well as the international co-operation in fast breeder reactor design and utilization. The Symposium was attended by almost 400 participants (340 participants, 35 observers and 20 journalists) from 25 countries and five international organizations. More than 80 papers were presented and discussed during six regular sessions and four poster sessions. A separate abstract was prepared for each of these papers

  7. Long-term corrosion study at nuclear power plant Bohunice (Slovakia)

    Science.gov (United States)

    Slugen, V.; Lipka, J.; Dekan, J.; Tóth, I.; Smieško, I.

    2010-03-01

    Steam generators of four VVER-440 units at nuclear power plants V-1 and V-2 in Jaslovske Bohunice (Slovakia) were gradually changed by new original "Bohunice" design in period 1994-1998. Corrosion processes before and after these design and material changes in Bohunice secondary circuit were studied using Mössbauer spectroscopy during last 25 years. Innovations in the feed water pipeline design as well as material composition improvements were evaluated positively. Mössbauer spectroscopy studies of phase composition of corrosion products were performed on real specimens scrapped from water pipelines or in form of filter deposits. The corrosion of new feed water pipelines system (from austenitic steel) in combination to innovated operation regimes goes dominantly to magnetite. The hematite presence is mostly on the internal surface of steam generator body and its concentration increases towards the top of the body. In the results interpretation it is necessary to consider also erosion as well as scope and type of maintenance activities. The long-term study of phase composition of corrosion products at VVER reactors is one of precondition for the safe operation over the projected NPP lifetime.

  8. Core monitoring and surveillance of VVER-440 type reactors in the Czech Republic and Slovak Republic

    International Nuclear Information System (INIS)

    The SCORPIO-VVER reactor core monitoring system is an advanced redundant software system without actuating members falling in the BT3 class which has been installed at the four Dukovany reactor units and at two units of the Slovak Jaslovske Bohunice V2 NPP. The system is described in detail and its history and experience gained at Dukovany are highlighted. (orig.)

  9. Risk-informed decision making during Bohunice NPP safety upgrading

    International Nuclear Information System (INIS)

    The paper summarizes some facts of risk-informed regulation developments within UJD regulatory environment. Based on national as well as international operating experience and indications resulted from PSA, Nuclear Regulatory Authority of the Slovak Republic (UJD) since its constituting in 1993 has devoted an effort to use PSA technology to support the regulatory policy in Slovakia. The PSA is considered a complement, not a substitute, to the deterministic approach. Suchlike integrated approach is used in decision making processes and the final decision on scope and priorities is based on it. The paper outlines risk insights used in the decision making process concerning Bohunice NPP safety upgrading and focuses on the role of PSA results in Gradual Reconstruction of Bohunice VI NPP. Besides, two other examples of the PSA results application to the decision making process are provided: the assessment of proposal of modifications to the main power supply diagram (incorporation of generator switches) and the assessment of licensee request for motor generator AOT (Allowable Outage Time) extension. As an example of improving support of Bohunice V-2 risk-informed operations, concept of AOT calculations and Bohunice V-2 Risk Monitor Project are briefly described. (author)

  10. Experience of Bohunice V-1 NPP

    International Nuclear Information System (INIS)

    Slovakia remains significantly dependent on imports of primary energy sources, which represent as much as 80% of the demand. Of the total consumption of electricity in Slovakia, 40% was generated in nuclear power plant units in 1998. Slovakia operates 6 units with WWER 440 nuclear reactors. Slovakia is the signatory of all important international agreements and conventions in the field of nuclear energy, and its legislation is in an advanced stage of approximation to European Union law. This is a very important aspect, showing Slovakia's approach to nuclear safety. In 1993 Slovakia accepted the commitments of the UN Convention on Climate Changes, including a reduction of greenhouse gases to 1990 levels by the year 2000. Moreover, as an internal target Slovakia has set the reaching of the 'Toronto Objective', i.e. 20% reduction in COx, emissions through the year 2005 as compared to 1988. In our opinion, this is not possible without nuclear energy. Time has shown, that the political aspects are more powerful, especially if you underestimate their importance over the than the technical ones. In the case of Bohunice V-1 NPP the political aspects were on the following levels: 1. Slovak republic (Czechoslovakia), political changes, decisions of the government; 2. European Union - Agenda 2000, Accession criteria, nuclear safety criteria, EBRD; 3. Austria as a neighbouring country. Starting with year 1990, 23 expert missions took place at Bohunice V-1 NPP by now. The only criteria for further operation should have been Nuclear safety, which is supervised by NRA SR. It was fully in compliance with EU policy, each country is solely responsible for its energy sector and for nuclear energy use. Our satisfaction lasted not too long. Following negotiation with EU on the highest political level, driven by willingness to be invited for negotiation of accession on the Helsinki Summit, the Slovak government decided on September 14th, on Bohunice V-1 Units shutdown in 2006 and 2008

  11. Bohunice - information within July 2004

    International Nuclear Information System (INIS)

    In this leaflet results of exploitation of four units of the Bohunice V-1 and V-2 NPPs are presented. The electricity and heat production in July 2004 are reviewed. Within a July 2004 the electricity was produced: 285 GWh (block 1), 292 GWh (block 2), 0 GWh (block 3), 20 GWh (block 4), totally 597 GWh, and 6352 GWh within a January - July 2004. The heat production in July 2004 was 9 417 GJ, and within a January - July 2004 it was produced 941 403 GJ of heat. After enlargement of European Union (EU) by ten new member states on May 1, 2004 the number of nuclear units has been risen by 19 units. 136 nuclear units were in operation in 'old' European Union. The most of nuclear units have been brought by Czech Republic and Slovak Republic (6 operational units, each state); Hungary has brought four units, Lithuania two and Slovenia one nuclear unit. Remaining five countries - Poland, Estonia, Cyprus, Latvia and Malta do not use nuclear energy for electricity production. Nuclear energetics is used in fourteen countries in enlarged European Union. France operates the largest number of nuclear units (59), which generated 77.67 per cent electricity of total French produced electricity in last year. However, France has lasted its dominant position in European Union since May, because two Lithuanian nuclear units generated 79.88 per cent of electricity in last year. In 2003 nuclear units reached 33.1 per cent of electricity generation within European Union. After enlargement of EU in 2004 this share should be raised to 34 per cent

  12. Internal communication at Bohunice NPPs

    International Nuclear Information System (INIS)

    Communication is the base of everyday existence of a modern person and every company. It is not easy to work in this area in a changing 'eastern' country. Many tools, which are used are in the mind of people connected with 'propaganda'. I would like to share our experience with you. The goal of an internal communication is to spread and provide continuous current of objective information between the management of Bohunice NPPs and its personnel and between the personnel itself. Communication with the Bohunice NPPs employees helps to get acquainted with their opinions and ideas concerning the subsidiary and nuclear power industry

  13. Safety improvement programme of WWER 440/230 units in Jaslovske Bohunice

    International Nuclear Information System (INIS)

    A brief overview is given of the power sources in Slovakia which include 6 operational reactor units (4 at Jaslovske Bohunice and 2 at Mochovce) and 2 units under construction (at Mochovce). The efforts undertaken in the past 10 years and aimed at upgrading the nuclear safety of the two older (V-230 Soviet type) units at Bohunice are highlighted. The relevant regulatory decisions are dealt with and the measures already carried out are listed. Also characterized are several IAEA international safety assessment missions and safety-aimed meetings which took place in 1998 and 1999 and are of concern to the older Bohunice units. (A.K.)

  14. Metamorphosis of NPP A1, V1, V2

    International Nuclear Information System (INIS)

    In this book the history of construction, commissioning and exploitation of NPP A1, NPP V1 and NPP V2 in Jaslovske Bohunice is presented on documentary photos. Vicinity around of these NPPs is presented, too

  15. Early closure of Bohunice V1 contested

    International Nuclear Information System (INIS)

    The early closure of the Bohunice V1 nuclear power plant following a time schedule that the Slovak government agreed with the EU three years ago is a political obligation of the government. The only objections to this plan so far have been related to the weakening of the generation base and economy of Slovenske elektrarne (SE), a.s. Neither the Nuclear Regulatory Authority of the Slovak Republic, nor the International Atomic Energy Agency, nor foreign experts preparing the closure of V1 in Jaslovske Bohunice have raised objections relating to increased security risks. Since he took up office last summer, the Minister of Economy Pavol Rusko has not hidden his personal interest in revising the agreement and extending the operation of the nuclear power plant. The fact that closing the power plant would have a negative impact on Slovakia's economy is not an argument good enough to persuade the original EU members. A proven security risk would be a better argument, especially as the operation of the V1 plant would not be extended literally - rather one of the reactors would work two years longer. Risk increased by 100%, a risk close to the level of acceptability in the EU - that is how in October he described the risks related to closure of V1 units according to the agreed time schedule, i.e. the first unit to be shut down by December 31, 2006 at the latest and the second unit by December 2008. The Minister based his opinion on a study prepared by the engineering and consulting company - Relko that assessed the risks V1 would represent after the first unit has been shut down. 'The only solution is to shut down both units at the same time', he concluded and in a comment addressed to the EU he added: 'If the EU has sincere intentions towards Slovakia, respects its security and does not wish it economic problems it will accept this'. (author)

  16. Safety upgrading of Bohunice V1 NPP

    International Nuclear Information System (INIS)

    This CD is multimedia presentation of programme safety upgrading of Bohunice V1 NPP. It consist of next chapters: (1) Introductory speeches; (2) Nuclear power plant WWER 440; (3) Safety improvement; (4) Bohunice Nuclear power plants subsidiary; (5) Siemens; (6) REKON; (7) VUJE Trnava, Inc. - Engineering, Design and Research Organisation; (8) Album

  17. The NPPR Trnava participation in the NPP V-2 modernisation and safety improvement project

    International Nuclear Information System (INIS)

    The presented contribution deals with form, present state and results of Nuclear Power Plants Research Inst.e participation in the NPP V-2 Jaslovske Bohunice Modernization and Safety Improvement Project.(author)

  18. Method of realization and exploitation of monitoring system for accuracy and reliability characteristics of standard temperature measurements in WWER-440 reactors at NPP Bohunice V1

    International Nuclear Information System (INIS)

    The sequences in development of computer equipment s and the sequences in development of measurement tools and procedures are listed in submitted presentation - from start-up the power plant in operation until present days. Present status of integration of a monitoring system for accuracy and reliability characteristics of standard temperature measurements in WWER-440 reactors in NPP V1 is presented here. The ways of data acquisition, storing of results and their evaluation are described in this presentation. In conclusion some practical possibilities of using a a monitoring system for accuracy and reliability are listed. (Authors)

  19. Simulation of VVER MCCI reactor test case with ASTEC V2/MEDICIS computer code

    International Nuclear Information System (INIS)

    This paper presents an application of the ASTEC v2, module MEDICIS for simulation of VVER Molten core concrete interaction test (MCCI) case without water injection. The main purpose of performed calculation is verification and improvement of module MEDICIS/ASTECv2 for better simulation of core concrete interaction processes. The VVER-1000 reference nuclear power plant was chosen as SARNET2 benchmark MCCI test-case. The initial conditions for MCCI test are taken after SBO scenario calculated with ASTEC version 1.3R2 by INRNE. (authors)

  20. REKO - Bohunice V-1. Experience with instrumentation and control system

    International Nuclear Information System (INIS)

    In this paper and in presentation some results of upgrading of the NPP Bohunice V-1 are presented. For the first time, extensive upgrades are performed in all safety-related areas of both units with VVER 440/230 reactors. These upgrades focused on: - Expansion and upgrading of the process safety systems; - Replacement of the safety I and C system with a TELEPERM XS-based system; - Spatial separation of safety equipment; - Modernisation of the electrical auxiliary power systems; - Seismic upgrading and fire protection; - Improvement of the man-machine interface. This upgrade is considered exemplary around the world. The most extensive stage of gradual reconstruction of Unit 2 was completed according to the schedule in January 1999. For the first time, a reactor which incorporates state-of-the-art digital I and C in its reactor protection system is on-line. (author)

  1. Decommissioning Project of Bohunice A1 NPP

    International Nuclear Information System (INIS)

    The first (pilot) nuclear power plant A1 in the Slovak Republic, situated on Jaslovske Bohunice site (60 km from Bratislava) with the capacity of 143 MWel, was commissioned in 1972 and was running with interruptions till 1977. A KS 150 reactor (HWGCR) with natural uranium as fuel, D2O as moderator and gaseous CO2 as coolant was installed in the A1 plant. Outlet steam from primary reactor coolant system with the temperature of 410 C was led to 6 modules of steam generators and from there to turbine generators. Refueling was carried out on-line at plant full power. The first serious incident associated with refueling occurred in 1976 when a locking mechanism at a fuel assembly failed. The core was not damaged during that incident and following a reconstruction of the damaged technology channel, the plant continued in operation. However, serious problems were occurring with the integrity of steam generators (CO2 gas on primary side, water and steam on secondary side) when the plant had to be shut down frequently due to failures and subsequent repairs. The second serious accident occurred in 1977 when a fuel assembly was overheated with a subsequent release of D2O into gas cooling circuit due to a human failure in the course of replacement of a fuel assembly. Subsequent rapid increase in humidity of the primary system resulted in damages of fuel elements in the core and the primary system was contaminated by fission products. In-reactor structures had been damaged, too. Activity had penetrated also into certain parts of the secondary system via leaking steam generators. Radiation situation in the course of both events on the plant site and around it had been below the level of limits specified. Based on a technical and economical justification of the demanding character of equipment repairs for the restoration of plant operation, and also due to a decision made not to continue with further construction of gas cooled reactors in Czechoslovakia, a decision was made in

  2. Research reactor core conversion guidebook. V.2: Analysis (Appendices A-F)

    International Nuclear Information System (INIS)

    Volume 2 consists of detailed Appendices, covering safety analyses for generic 10 MW reactor, safety analysis - probabilistic methods, methods for preventing LOCA, radiological consequence analyses, examples of safety report amendments and safety specifications. Included in Volume 2 are example analyses for cores with with highly enriched uranium and low enriched uranium fuels showing differences that can be expected in the safety parameters and radiological consequences of postulated accidents. There are seven examples of licensing documents related to core conversion and two examples of methods for determining power limits for safety specifications in the document. Refs, figs, bibliographies and tabs

  3. Bohunice NPPs - Part of the Slovak's economy (sustainable) development

    International Nuclear Information System (INIS)

    Of the total consumption of electricity in Slovakia, 42% was generated in nuclear power plant units in 1999. Slovakia operates 6 units with a WWER 440 nuclear reactors, 4 of them are at Bohunice site and 2 at Mochovce. The Nuclear Regulatory Authority of SR is not the only regulatory body controlling nuclear activity. Both - the system of nuclear activities regulation in Slovakia as well as the approach to Nuclear Safety enhancement of the operator were positively judged by IAEA and WENRA. In 1993 -Slovakia has accepted the commitments of the UN Convention on Climate Changes, including a reduction of greenhouse gases to 1990 levels by the year 2000. Moreover, as an internal target Slovakia has set the reaching of the ,'Toronto Objective', i.e. 20% reduction in COx emissions through the year 2005 as compared to 1988. Taking into account the actual situation as well as natural conditions for some renewable sources utilisation, the target won't be reached without nuclear energy. The nuclear energy is free of emissions, does not burn oxygen, and with the share of production in Slovakia will remain significant contributor. To the environment protection it contributes also by replacing fossil heat plants with heat delivery for the region. In case of radiological wastes the environment protection is ensured by very strict system of control, evidence, treatment and repository. To conclude, Bohunice NPPs were, are and will remain very important part of the Slovak's economy, creating conditions for its (sustainable) development

  4. The human factor and the part it plays in failures of the normal operation of water-cooled, water-moderated WWER-440 reactors at the Bohunice nuclear power plant

    International Nuclear Information System (INIS)

    The paper presents the findings of a study of the role of the human factor based on the results of the first four years of operation of the Bohunice B-1 nuclear power plant. It describes the method by which plant personnel are trained and the system of maintaining the level of staff skills. It is expected that there will be an improvement in the quality of personnel training and that an analysis of the role of the human factor will be made in the course of subsequent operation. (author)

  5. Program of upgrading and safety improvement of NPP V-2 units

    International Nuclear Information System (INIS)

    This paper dealt with the role of Bohunice NPP in the frame of energy production by Slovak Energy joint company, upgrading and safety improvement of NPP V-2 units, basic documents for defining the goals of NPP V-2 units safety upgrading, assessment of safety of NPP V-2 units, program of upgrading and safety improvement of NPP V-2 units, and with the financial resources necessary for upgrading and safety improvement of NPP V-2 units

  6. Experience with applying the automated control system to maintenance at the Bohunice nuclear power plant

    International Nuclear Information System (INIS)

    The automated system of maintenance control at the V-1 nuclear power plant at Jaslovske Bohunice uses experience gained with the maintenance of the A-1 nuclear power plant. With regard to the range of work operations, maintenance includes inspection, routine repair, overhaul of equipment and replacement. Also observed is the classification of equipment according to whether it may be repaired without reactor shutdown or whether the reactor will have to be shut down. At present the maintenance of the Jaslovske Bohunice nuclear power plant is being processed by an automated control system into five year variable plans of repairs, annual and monthly plans of repairs, plans of shut-downs and a schedule of unit shutdowns. The repair plan includes over 6000 items. (Z.M.)

  7. Testing of measuring systems TELEPERM-XS and SUGAN at Bohunice NPP during physical start-up tests commissioning in year 2000

    International Nuclear Information System (INIS)

    The paper presents testing methodology of neutron flux measurements systems used standard chains incorporated to the reactor control system and non-standard measuring system, used during start-up tests after refuelling of the reactors. Comparison of both measuring systems is given. Methodology is illustrated on results of measurements performed at Bohunice NPP during reactor start-up tests.(author)

  8. Personnel education and training at Bohunice NPP

    International Nuclear Information System (INIS)

    Procedure for education and training of all the personnel employed at Bohunice Nuclear power plant is presented in detail describing the training system structure, kinds of training, staff members qualification development, short term and long term tasks needed to assure attaining the training objectives. The proposed Staff Members Lifetime education implementation project contains basic starting points, measures to be implemented by 1998. It was prepared on the basis of a primary analysis which confirmed the existing need for implementing the lifetime education system

  9. Seismic evaluation and strengthening of Bohunice nuclear power plant structures

    International Nuclear Information System (INIS)

    A seismic assessment and strengthening investigation is being performed for selected structures at the Bohunice V1 Nuclear Power Plant in Slovakia. Structures covered in this paper include the reactor building complex and the emergency generator station. The emergency generator station is emphasized in the paper as work is nearly complete while work on the reactor building complex is ongoing at this time. Seismic evaluation and strengthening work is being performed by a cooperative effort of Siemens and EQE along with local contractors. Seismic input is the interim Review Level Earthquake (horizontal peak ground acceleration of 0.3 g). The Bohunice V1 reactor building complex is a WWER 4401230 nuclear power plant that was originally built in the mid-1970s but had extensive seismic upgrades in 1991. Siemens has performed three dimensional dynamic analyses of the reactor building complex to develop seismic demand in structural elements. EQE is assessing seismic capacities of structural elements and developing strengthening schemes, where needed. Based on recent seismic response analyses for the interim Review Level Earthquake which account for soil-structure interaction in a rigorous manner, the 1991 seismic upgrade has been found to be inadequate in both member/connection strength and in providing complete load paths to the foundation. Additional strengthening is being developed. The emergency generator station was built in the 1970s and is a two-story unreinforced brick masonry (URM) shear wall building above grade with a one story reinforced concrete shear wall basement below grade. Seismic analyses and testing of the URM walls has been performed to assess the need for building strengthening. Required structural strengthening for in-plane forces consists of revised and additional vertical steel framing and connections, stiffening of horizontal roof bracing, and steel connections between the roof and supporting walls and pointing of two interior transverse URM

  10. Reconstruction of the V-1 nuclear power plant at Jaslovske Bohunice

    International Nuclear Information System (INIS)

    Based on the 1991 recommendation by the former Czechoslovak nuclear regulatory body - the Czechoslovak Atomic Energy Commission - the minor reconstruction of the V-1 nuclear power plant at Jaslovske Bohunice was aimed at safety improvement in the following fields: reactor pressure vessel and primary circuit integrity, hermetic compartments, instrumentation and control systems and accident protection systems, home consumption electrical systems, fire safety, seismic resistance, and reactor aftercooling in case of steam generator feedwater failure. The results of the reconstruction are presented. The reconstruction provided for all the recommendations. (J.B.). 2 tabs

  11. Utilization of the SMART v2.1 monitor to calculate the stability of a boiling water reactor

    International Nuclear Information System (INIS)

    The nuclear reactor stability is very important in the shutdown and start-up of the boiling water reactor, because in these situations, working conditions are close to the unstable zone. For this reason, the Thermohydraulic and Nuclear Engineering Group, together with IBERDROLA, spend several years carrying out a monitor to analyze the stability of these reactors.

  12. Information letter 2. Information about operation of plants SE-NPP Bohunice and SE-VYZ during February 2005

    International Nuclear Information System (INIS)

    In this leaflet results of exploitation of four units of the Bohunice V-1 and V-2 NPPs are presented. The electricity and heat production in February 2005 are reviewed. Within a February 2005 the electricity was produced: 217 GWh (block 1), 281 GWh (block 2), 277 GWh (block 3), 282 GWh (block 4), totally 1057 GWh, and 2271 GWh within a January - February 2005. The heat production in February 2005 was 266 506 GJ, and within a January - February 2005 it was produced 531 849 GJ of heat. On February 17 Slovak minister of economy Pavol Rusko and general director of ENEL Paolo Scaroni signed the agreement on acquisition of 66 per cent of Slovenske elektrarne (SE) by Italian ENEL for 840 million Eur. SE has capacity of around 7 GW (83 per cent of total Slovakian capacity). In 2004 SE generated 26 TWh of electricity. Processing and storage of radioactive wastes in Decommissioning of Nuclear Installations and Spent Fuel and Rad-waste Management (SE-VYZ) is presented. Since beginning of this year 58 fibre-concrete containers have been filled up in Bohunice processing centre of radioactive wastes. Twenty-three pieces of fibre-concrete containers were processed into fibre-concrete containers in Bohunice processing centre of radioactive wastes (BSC RAO) in February 2005. Twenty fibre-concrete containers were stored into Republic storage of radioactive wastes (RU RAO). Total number in RU RAO reached 830 pieces of fibre-concrete containers, which represent 11.53 per cent of storage capacity (7200 containers). Bohunice processing centre of radioactive wastes was put into active operation just before five years

  13. Response of native flora to inducible genotoxic damage from increased radioactivity around NPP Jaslovske Bohunice, Slovakia

    International Nuclear Information System (INIS)

    It is not generally known that the first serious failure of nuclear power plant (NPP) technology with loss of human lives occurred in NPP Jaslovske Bohunice (Czechoslovakia) in January 1976. A year later the second accident finally broken reactor A1 with large radioactive contamination. This material was later (in 1980) washed into the nearby drainage by the heavy rain. In cleaning procedure, the contaminated soil particles contaminated the slopes of the drainage. These spots have the shape of 'blurs' about 15 cm wide with a scale of contamination from 0,067; 0,15; 2,38; 9,5; 45.5 up to 322 kBq/kg 137Cs. The research was done in cooperation with the Institute of Tumorbiology, University of Vienna, within the grant Action Austria - Slovak Republic. Details of radioactivity at the area were obtained thanks to the Research Institute of the Nuclear Energy in Trnava, Slovakia. In our ten years long-term study of contaminated soil around nuclear power plant (NPP) Jaslovske Bohunice 24 species of local flora were used to show impact of these accidents. The 19 km long banks of the Jaslovske Bohunice NPP waste water recipient has been identified as contaminated by 137Cs. In total, more than 67,000 m2 of river banks have been found as being contaminated at levels exceeding 1 Bq 137Cs/g of soil. Used phytotoxic and cytogenetic -in situ' tests were extended by analyses of pollen grains. Although the dose of some samples of radioactive soil was relatively high (322 kBq kg-1) no any significant impact on the biological level of tested wild plant species was observed. Possible explanation (such as adaptation and resistance) is discussed. (author)

  14. V2:Performance of the solid deuterium ultra-cold neutron source at the pulsed reactor TRIGA Mainz

    OpenAIRE

    Karch, J.; Sobolev, Yu.; M. Beck; Eberhardt, K.; Hampel, G.; Heil, W.; Kieser, R.; Reich, T.; Trautmann, N.; Ziegner, M.

    2013-01-01

    The performance of the solid deuterium ultra-cold neutron source at the pulsed reactor TRIGA Mainz with a maximum peak energy of 10 MJ is described. The solid deuterium converter with a volume of V=160 cm3 (8 mol), which is exposed to a thermal neutron fluence of 4.5x10^13 n/cm2, delivers up to 550 000 UCN per pulse outside of the biological shield at the experimental area. UCN densities of ~ 10/cm3 are obtained in stainless steel bottles of V ~ 10 L resulting in a storage efficiency of ~20%....

  15. LBB technology application to the primary piping system of the NPP V1 Jaslovske Bohunice

    International Nuclear Information System (INIS)

    Due to several deficiences of the WER Model 230 type reactor a leak before break demonstration of this reactor is of primary importance. The complex project for NPP V1 Jaslovske Bohunice includes a static and dynamic stress analysis of the primary piping, a fatique damage analysis, leak rate assessments and an analysis of the stability of the heavy components supports. The material database includes data on fracture mechanics, on assessment of corrosion properties, and on the influence of 100 000 hr service exposure on base metal and welds including disimilar welds. The program was supported by large scale experiments on RPV safe-end, pressurizer safe-end, elbow welds with through-wall cracks and leak rate measurements. The results and applications are discussed. (orig.)

  16. Safety culture at the Bohunice nuclear power plant

    International Nuclear Information System (INIS)

    The approach of the Bohunice nuclear power plant to the safety culture issue is highlighted. Activities performed so far at the plant to improve the plant safety culture with a view to enhancing the awareness of each employee and thus to minimize the effect of the human factor on the evolution of incidents and accidents at the plant are described. (author)

  17. Regulatory involvement in IandC systems upgrading on WWER 440 type reactors in the Slovak Republic

    International Nuclear Information System (INIS)

    An overview is given of the recommendations and regulations concerning IandC systems of nuclear power plants with WWER-440 reactors in the Slovak Republic, and of the relevant involvement of regulatory bodies. The issues included in regulatory decrees and pertaining to the safety aspects of IandC systems are mentioned point by point, with emphasis put on the upgrading of the systems. The power plants covered include the Bohunice V-1 and V-2 plants and the Mochovce-1 and Mochovce-2 units. (A.K.)

  18. Seismic and geological conditions at the Bohunice NPP site

    International Nuclear Information System (INIS)

    The paper brings basic information on geological and seismic characteristics of the site of NPP Jaslovske Bohunice, Slovakia. Western Carpathians and Trnava, bay geological properties are briefly introduced. The most important macroseismic data and data obtained from field measurements are analysed. Main features of the expected strong seismic motion are discussed. The attention is devoted to local soil characteristics just under the site of NPP. (author)

  19. Experience in modernization of safety I and C in VVER 440 nuclear power plants Bohunice V1 and Paks

    International Nuclear Information System (INIS)

    For nuclear power plants which have been in operation for more than 15 years, backfitting or even complete replacement of the instrumentation and control (I and C) equipment becomes an increasingly attractive option, motivated not only by the objective to reduce the cost of I and C system maintenance and repair but also to prolong or at least to safeguard the plant life-time: optimized spare-part management through use of standard equipment; reduction of number and variety of different items of equipment by implementing functions stepwise in application software; adding new functionality in the application software which was not possible in the old technology due to lack of space; safeguarding of long-term After-Sales-Service. Some years ago Bohunice V1 NPP, Slovak Republic and Paks NPP, Hungary intended to replace parts of their Safety I and C, mainly the Reactor Trip System, the Reactor Limitation System and the Neutron Flux Excore Instrumentation and Monitoring Systems. After a Basic Engineering Phase in Bohunice V1 and a Feasibility Study in Paks both plants decided to use the Siemens' Digital Safety I and C System TELEPERM XS to modernize their plants. Both Bohunice, Unit 2 and Paks, Unit 1 have been back on line for over six months with the new Digital Safety I and C. At the present time Bohunice, Unit 1 and within the next few months Paks, Unit 2 will be replaced. Trouble-free start-ups and no major problems under operation in the first two plants were based on: thorough understanding of the VVER 440 technology; comprehensive planning together with the plant operators and authorities; the possibility to adapt TELEPERM XS to every plant type; the execution of extensive pre-operational tests. Regarding these modernization measures Siemens, as well as the above Operators, have gained considerable experience in the field of I and C Modernization in VVER 440 NPPs. Important aspects of this experience are: how to transfer the VVER technology to TELEPERM XS; how to

  20. Proceedings of the GCNEP-IAEA course on natural circulation phenomena and passive safety systems in advanced water cooled reactors. V.2

    International Nuclear Information System (INIS)

    The current status and prospect, economics, advanced designs and applications of reactors in operation and construction, safety of advanced water cooled reactors is discussed. Papers relevant to INIS are indexed separately

  1. Safety analysis report, deterministic and probabilistic evaluation after Bohunice V1 NPP gradual upgrading

    International Nuclear Information System (INIS)

    This presentation describes approach used for nuclear safety assessment at the V -1 Bohunice after the Gradual Upgrading. The deterministic and probabilistic results are presented in detail form. (author)

  2. The role of impurities in thermally stimulated luminescence of MgO:Mn2+ and MgO:V2+ crystals irradiated in a reactor

    International Nuclear Information System (INIS)

    The high-temperature thermally stimulated luminescence (TSL) of nominally pure MgO crystals and MgO crystals with excessive amounts of paramagnetic manganese and vanadium ions irradiated in a reactor has been studied. It was observed that the influence of impurity on the TSL of crystal is different at low and relatively high doses. (copyright 2007 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)

  3. Chemistry monitoring and diagnostic system at NPP Jaslovske Bohunice

    International Nuclear Information System (INIS)

    This paper provides a description of water chemistry monitoring and diagnostic system installed at Slovak NPP Jaslovske Bohunice. System has complex architecture and covers laboratory data, chemistry and radiochemistry on-line monitoring data, process data acquisition and processing and diagnostics. Pre-filtered data from process computer and chemistry on-line monitors are recorded together with laboratory data in the ORACLE-based information system CHEMIS with many presentation and processing features. Brief information is given about the basic features of a newly developed diagnostic system for early detection and identification of anomalies incoming in the water chemistry regime of the primary and secondary circuit of VVER-440 type unit. This system, called SACHER (System of Analysis of Chemical Regime) has been installed within the major modernization project at the NPP Bohunice in the Slovak Republic. System SACHER has been developed fully in MATLAB environment. Diagnostic system works exclusively with available on-line data as an operation personnel support application allowing effective response to adverse chemistry events/trends. The availability of prompt information about the chemical conditions of the primary and secondary circuit is very important in order to prevent the undue corrosion and deposit build-up processes within the plant systems. The typical chemical information systems that exist and work at the NPPs give the user values of the measured quantities together with their time trends and other derived values. It is then the experienced user's role to recognize the situation the monitored process is in and make the subsequent decisions and take the measures. The SACHER system, based on the computational intelligence techniques, inserts the elements of intelligence into the overall chemical information system. It has the modular structure with the following most important modules: - normality module- its aim is to recognize that the process

  4. Analysis of Steam Generators Corrosion Products from Slovak NPP Bohunice

    Directory of Open Access Journals (Sweden)

    Jarmila Degmová

    2012-01-01

    Full Text Available One of the main goals of the nuclear industry is to increase the nuclear safety and reliability of nuclear power plants (NPPs. As the steam generator (SG is the most corrosion sensitive component of NPPs, it is important to analyze the corrosion process and optimize its construction materials to avoid damages like corrosion cracking. For this purpose two different kinds of SGs and its feed water distributing systems from the NPP Jaslovske Bohunice were studied by nondestructive Mössbauer spectroscopy. The samples were scraped from the surface and analyzed in transmission geometry. Magnetite and hematite were found to be the main components in the corrosion layers of both SGs. Dependant of the material the SG consisted of, and the location in the system where the samples were taken, the ratios between magnetite and hematite and the paramagnetic components were different. The obtained results can be used to improve corrosion safety of the VVER-440 secondary circuit as well as to optimize its water chemistry regime.

  5. Project Management Unit for decommissioning of NPP Bohunice VI (2003-2014); Project Management Unit para el desmantelamiento de CN Bohunice V1 (2003-2014)

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez Fernandez-conde, A.; Brochet, I.; Ferreira, A.

    2015-07-01

    From October 2003 until december 2014 the Consortium consisting of Iberdrola Engineering and Construction (leader). Empresarios Agrupados Internacional, and Indra Sistemas has carried out the project Project Management Unit ((PMU) for the decommissioning of Bohunice V1 NPP (units 1 and 2), type VVER-440/V-230 in Slovakia. during the first phase (2003-2007) EdF was also part of the Consortium. The project is funded by the Bohunice International Decommissioning Support Fund (BIDSF) administered by the RBRD. The main objective of the project is to provide the necessary engineering and resources of project management for planning, execution, management, coordination and monitoring of all tasks in support of the decommissioning. (Author)

  6. The common project for completion of Bubbler Condenser Qualification (Bohunice, Mochovce, Dukovany and Paks NPPs)

    International Nuclear Information System (INIS)

    Described is the common project for completion of bubbler condenser qualification for nuclear power plants in Bohunice, Mochovice, Dukovany and Paks. Functionality of the bubbler condenser was elaborated during the simulation of the main steam line brake, medium break and small break LOCA. On this basis the appropriate operation of bubbler condenser containment under accident conditions can be positively confirmed

  7. Post-reconstruction full power and shut down level 2 PSA study for Unit 1 of Bohunice V1 NPP

    International Nuclear Information System (INIS)

    The level 2 PSA model of the J. Bohunice V1 NPP was developed in the RISK SPECTRUM Professional code with the following objectives: to identify the ways in which radioactive releases from the plant can occur following the core damage; to calculate the magnitudes and frequency of the release; to provide insights into the plant behaviour during a severe accident; to provide a framework for understanding containment failure modes; the impact of the phenomena that could occur during and following core damage and have the potential to challenge the integrity of the confinement; to support the severe accident management and development of SAMGs. The magnitudes of release categories are calculated using: the MAAP4/VVER for reactor operation and shutdown mode with closed reactor vessel and the MELCOR code for shutdown mode with open reactor vessel. In this paper an overview of the Level 2 PSA methodology; description of the confinement; the interface between the level 1 and 2 PSA and accident progression analyses are presented. An evaluation of the confinement failure modes and construction of the confinement event trees as well as definition of release categories, source term analysis and sensitivity analyses are also discussed. The presented results indicate that: 1)for the full power operation - there is an 25% probability that the confinement will successfully maintain its integrity and prevent an uncontrolled fission product release; the most likely mode of release from the confinement is a confinement bypass after SGTM with conditional probability of 30%; the conditional probability for the confinement isolation failure probability without spray is 5%, for early confinement failure at the vessel failure is 4%, for other categories 1% or less; 2) for the shutdown operating modes - the shutdown risk is high for the open reactor vessel and open confinement; important severe accident sequences exists for release categories: RC5.1, RC5.2 and RC6.2

  8. The PLTEMP V2.1 code

    International Nuclear Information System (INIS)

    Recent improvements to the computer code PLTEMP/ANL V2.1 are described. A new iterative, error-minimization solution technique is used to obtain the thermal distribution both within each fuel plate, and along the axial length of each coolant channel. A new, radial geometry solution is available for tube-type fuel assemblies. Software comparisons of these and other new models are described. Applications to Russian-designed IRT-type research reactors are described. (author)

  9. Final results of the gradual reconstruction of Bohunice VI in Slovakia and evaluation of the reconstruction by international missions

    International Nuclear Information System (INIS)

    The gradual reconstruction of the Bohunice V1 nuclear power plant (Slovakia) represents the most extensive reconstruction of a nuclear power plant in operation as implemented worldwide up to now. Extensive reconstruction works in both civil construction and process parts, in instrumentation and control part, and in electric part enhanced both nuclear safety and operational reliability of Bohunice V1 in a significant way.(author)

  10. Assessment of SFR reactor safety issues. Part I: Analysis of the unprotected ULOF, ULOHS and UTOP transients for the SFR(v2b-ST) reactor design and assessment of the efficiency of a passive safety system for prevention of severe accidents

    International Nuclear Information System (INIS)

    Highlights: • Innovative sodium cooled fast reactor concepts are investigated. • Newly conceived mitigation measures of the severe transients are being investigated. • Evaluation of severe transient behavior in sodium-cooled fast reactors is being performed. - Abstract: In the frame of an AREVA – KIT cooperation in the years 2008–2013 on R&D issues associated with Innovative sodium cooled fast reactor concepts, several major topics were identified as being of mutual interest to both partners, one of which was the evaluation of severe transient behavior in Sodium-cooled Fast Reactors (SFRs) and the impact of newly conceived mitigation measures. The SFR design taken for the analysis was the SFR(v2b-ST) reactor design, and the system code to be used was selected to be the SIM-SFR code. The transients chosen for evaluation of the efficiency of mitigation measures were the unprotected loss-of-flow (ULOF), the unprotected loss-of-heat-sink (ULOHS) and the unprotected transient-overpower (UTOP)

  11. Resin intrusion into the primary circuit of NPP Jaslovske Bohunice V-1

    International Nuclear Information System (INIS)

    During the refueling at the first unit of Bohunice NPP in 2005 a lot of sediment was found on the upper storage rack. This sediment was identification as a filter resin. Resin was found in most of the fuel assemblies, pipes and tanks of the primary circuit and his auxiliary systems. Resin producer and WANO network was contacted in order to get information about similar events. Management of Bohunice NPP made a decision that primary circuit, fuel assemblies and auxiliary systems have to be cleaned. Subsequent cleaning extended outage by 31 days. This paper summarizes causes, existing consequences and corrective actions. Accent was put on the hydraulic characteristics of the primary circuit measurement, power distribution core monitoring and the primary circuit water quality verification (Authors)

  12. Project Management Unit for decommissioning of NPP Bohunice VI (2003-2014)

    International Nuclear Information System (INIS)

    From October 2003 until december 2014 the Consortium consisting of Iberdrola Engineering and Construction (leader). Empresarios Agrupados Internacional, and Indra Sistemas has carried out the project Project Management Unit ((PMU) for the decommissioning of Bohunice V1 NPP (units 1 and 2), type VVER-440/V-230 in Slovakia. during the first phase (2003-2007) EdF was also part of the Consortium. The project is funded by the Bohunice International Decommissioning Support Fund (BIDSF) administered by the RBRD. The main objective of the project is to provide the necessary engineering and resources of project management for planning, execution, management, coordination and monitoring of all tasks in support of the decommissioning. (Author)

  13. Programmes design for Bohunice NPP personnel other than control room operators

    International Nuclear Information System (INIS)

    This paper deals with project development of training programmes for non-licenced NPP personnel-masters, field operators, maintenance and technical supporting personnel. The programme development focuses on the part stage and on the job training at NPP. Bohunice NPP belongs to plants with higher specific number of personnel per installed power capacity. This factor also influenced the choice of programmes design. Undermentioned procedure is one of various approaches to SAT exploitation for training programmes design. (author)

  14. Bohunice NPP experience with SARs and Safety Analyses. TM on Comparative Analysis of Assumptions, Models and Results of AA included in SAR. IAEA RER/9/070

    International Nuclear Information System (INIS)

    Regulatory authority decided in 1993 that will use REG 1.70 format for FSARs of Bohunice NPP. The new format first is used for V-2 FSAR in 1995 (upgrading after 10 years of commercial operation). After issuing of V-2 FSAR, it passed several internal review and IAEA mission. During the process of estimation of FSAR many shortcomings and problems is discovered. The main discovered general problems concerns sharing of architect-engineer role between domestic and foreign organisation, absence or unavailability of a part of the design basis information and missing of national guidelines and need to adopt international (IAEA) or foreign ones (US, German, French) guidelines for specific types of analyses). Difficulties of FSAR development are generated by application of different approaches to the design, construction (original design standards - OPB) and to the assessment of the safety of the NPP (western, IAEA), as well as a lack of communication between the NPPs / national engineering organizations and the General designer. The shortcomings of Chapter 15 is expressed in justification of the computational variants, consistency (data, modeling approach, assumptions), different approach to conservatism in individual subchapters (application of SFC, boundary conditions, initial conditions), acceptance criteria not always properly evaluated and 'author / user effect'. The conclusion of estimation of present situation is based on the implications and shows necessity for overall correction and extension of the FSAR (requirements surpassing REG 1.70). About Chapter 15 is achieved unification of the approach in different areas of AA (consistency) and elimination of inconsistencies, including of bounding scenarios into all subchapters and general format related improvements (legibility, quality of graphics etc.) Development of plant specific accident analysis methodologies are started in 1995 in collaboration with VUJE Trnava and main basis are the drafts of IAEA-WWER-EBP-01

  15. Thickness measurement of A-1 reactor caisson tube walls

    International Nuclear Information System (INIS)

    The equipment is described of measuring the thickness of caisson pipes built in the Bohunice A-1 reactor. The pulse-type ultrasonic thickness gauge is based on the reflection method using the double probe. The measurement accuracy is 0.1 mm. (J.B.)

  16. Environment monitoring and residents health condition monitoring of nuclear power plant Bohunice region

    International Nuclear Information System (INIS)

    The report contents final environment evaluation and selected characteristic of residents health physics of nuclear power plant Bohunice region. Evaluated data were elaborated during analytical period 1993-1997.Task solving which results are documented in this final report was going on between 1996- 1998. The report deals in individual stages with the following: Information obtaining and completing which characterize demographic situation of the area for the 1993-1997 period; Datum obtaining and completing which contain selected health physics characteristics of the area residents; Database structures for individual data archiving from monitoring and collection; Brief description of geographic information system for graphic presentation of evaluation results based on topographic base; Digital mapping structure description; Results and evaluation of radionuclide monitoring in environment performed by Environmental radiation measurements laboratory by the nuclear power plant Bohunice for the 1993-1997 period. Demographic situation evaluation and selected health physics characteristics of the area of nuclear power plant residents for the 1993-1997 period are summarized in the final part of the document. Monitoring results and their evaluation is processed in graph, table, text description and map output forms. Map outputs are processed in the geographic information system Arc View GIS 3.0a environment

  17. AdapterRemoval v2

    DEFF Research Database (Denmark)

    Schubert, Mikkel; Lindgreen, Stinus; Orlando, Ludovic

    2016-01-01

    process the growing amount of data generated per sequencing run. FINDINGS: We introduce AdapterRemoval v2, a major revision of AdapterRemoval v1, which introduces (i) striking improvements in throughput, through the use of single instruction, multiple data (SIMD; SSE1 and SSE2) instructions and multi......-threading support, (ii) the ability to handle datasets containing reads or read-pairs with different adapters or adapter pairs, (iii) simultaneous demultiplexing and adapter trimming, (iv) the ability to reconstruct adapter sequences from paired-end reads for poorly documented data sets, and (v) native gzip and...... bzip2 support. CONCLUSIONS: We show that AdapterRemoval v2 compares favorably with existing tools, while offering superior throughput to most alternatives examined here, both for single and multi-threaded operations....

  18. Planning for environmental restoration of the contaminated banks near NPP Bohunice

    International Nuclear Information System (INIS)

    The 18 km long banks of the Bohunice NPP waste water recipient are contaminated by cesium-137 as a result of two accidents on the CO2 cooled NPP A1 unit in 1976 and 1977. Since 1992, all he contaminated waste waters dumping from NPP Bohunice has been carried out directly to the Vah River through a specially constructed 15 km long pipeline. The final extent of contamination in the Bohunice site is represented. The overall contaminated area in this site with cesium-137 activity above 1 Bq/g of soil is about 67000 m2 and thus, the corresponding volume of top 20 cm thick soil layer is about 13000 m3. For optimizing less costly remedial measures (warning signs...) an agreed scenario with a pre-estimated factor factor collective dose 2.10-7 man.Sv.y-1/(m2.Bq137Cs.g-1) was applied. Limitation of individual effective doses according to a site specific stay scenario was also considered for this purposes with a limiting value of 0.25 mSv/y. Cost analysis of available remedial techniques were carried out, too. Two techniques have been selected for the contaminated banks restoration project: 1) removing/disposal of 20 cm soil top layer from steep and unengineered banks, and 2) mechanical dilution/fixation of contamination by clean 15 cm soil cover for the contaminated flat areas. Two-fold reduction of anticipated potential radiation risk were accepted, maximally, for the lastly mentioned technique, however cost saving is considerable (about 10-time lower the cost comparing to removing/disposal technique one). The basic acceptance limits AL for 137Cs in soil and criteria size of continuously contaminated bank areas were derived as: AL200 = 6.0 Bq/g and 800 m2 (300 m) or AL50 8.0 Bq/g and 200 m2 (80 m) for removing/disposal of the soil on steep unengineered banks. For clean soil covering technique the resulting limits are in an interval AL50C = 8 up to 16 Bq/g. According to the criteria developed, it is necessary to subject to restoration about 11000 m2 of contaminated area on

  19. Principles and criteria for environmental restoration of the contaminated banks near NPP Bohunice

    International Nuclear Information System (INIS)

    The 18 km long banks of the Bohunice NPP waste water recipient are contaminated by 137Cs as a result of two accidents on the CO2 cooled NPP-A1 unit in 1976 and 1977. Contamination acceptance limits 6 or 8 Bq 137Cslg of soil, depending on contaminated area size, were derived on the basis of developed principles, and approved by the authorities. Removing and safe burial of 1,100 m3 of contaminated soil from steep area and 15 cm thick clean soil covering on about 1ha of flat area of the contaminated banks is planned in frame of the re-considered restoration project implementation in 1995/96. (author)

  20. WWER–440 Spent Fuel and Structural Materials Performance in Jaslovke Bohunice Wet Storage Facility

    International Nuclear Information System (INIS)

    The main goals of actual stage of this long-term project are: • Analyses of the seventh set of specimens No.116/2 from ATABOR steel after 7, 5 eventually 4 years of exposition in the Bohunice spent fuel interim wet storage environment using the following methods: o Documentation of sample surfaces after removal from storage pool; - Microstructure evaluation for the base and weld metal; - Analysis of corrosion media influence to the structure of ATABOR steel using the light microscopy; o Scanning electron microscopy and microanalysis of exposed samples; • The optimization of database structure on the base of experience from the second stage of SPAR-III contract; • On the basis of the analysis results to prepare the new optimized set of specimens prepared from the specific heat of ATABOR steel

  1. ASTEC V2 severe accident integral code main features, current V2.0 modelling status, perspectives

    Energy Technology Data Exchange (ETDEWEB)

    Chatelard, P., E-mail: patrick.chatelard@irsn.fr [Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, B.250, Cadarache BP3 13115, Saint-Paul-lez-Durance, Cedex (France); Reinke, N.; Arndt, S. [Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) mbH, Schwertnergasse 1, 50677 Köln (Germany); Belon, S.; Cantrel, L.; Carenini, L.; Chevalier-Jabet, K.; Cousin, F. [Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, B.250, Cadarache BP3 13115, Saint-Paul-lez-Durance, Cedex (France); Eckel, J. [Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) mbH, Schwertnergasse 1, 50677 Köln (Germany); Jacq, F.; Marchetto, C.; Mun, C.; Piar, L. [Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, B.250, Cadarache BP3 13115, Saint-Paul-lez-Durance, Cedex (France)

    2014-06-01

    The severe accident integral code ASTEC, jointly developed since almost 20 years by IRSN and GRS, simulates the behaviour of a whole nuclear power plant under severe accident conditions, including severe accident management by engineering systems and procedures. Since 2004, the ASTEC code is progressively becoming the reference European severe accident integral code through in particular the intensification of research activities carried out in the frame of the SARNET European network of excellence. The first version of the new series ASTEC V2 was released in 2009 to about 30 organizations worldwide and in particular to SARNET partners. With respect to the previous V1 series, this new V2 series includes advanced core degradation models (issued from the ICARE2 IRSN mechanistic code) and necessary extensions to be applicable to Gen. III reactor designs, notably a description of the core catcher component to simulate severe accidents transients applied to the EPR reactor. Besides these two key-evolutions, most of the other physical modules have also been improved and ASTEC V2 is now coupled to the SUNSET statistical tool to make easier the uncertainty and sensitivity analyses. The ASTEC models are today at the state of the art (in particular fission product models with respect to source term evaluation), except for quenching of a severely damage core. Beyond the need to develop an adequate model for the reflooding of a degraded core, the main other mean-term objectives are to further progress on the on-going extension of the scope of application to BWR and CANDU reactors, to spent fuel pool accidents as well as to accidents in both the ITER Fusion facility and Gen. IV reactors (in priority on sodium-cooled fast reactors) while making ASTEC evolving towards a severe accident simulator constitutes the main long-term objective. This paper presents the status of the ASTEC V2 versions, focussing on the description of V2.0 models for water-cooled nuclear plants.

  2. Bohunician technology and thermoluminescence dating of the type locality of Brno-Bohunice (Czech Republic).

    Science.gov (United States)

    Richter, D; Tostevin, G; Skrdla, P

    2008-11-01

    Results of thermoluminescence (TL) dating of 11 heated flint artifacts from the 2002 excavation at Brno-Bohunice, Czech Republic, are presented. The samples are from the eponym locality for the Bohunician, an industrial type considered technologically transitional between Middle and Upper Paleolithic core reduction strategies. The Bohunician is the first early Upper Paleolithic technocomplex in the Middle Danube of Central Europe and, therefore, is implicated in several issues related to the origins of modern humans in Europe. The Bohunician provides an example of how one technological strategy combines crested blade initiation of a core with the surficial (almost Levalloisian) reduction of blanks as blades and points. As the Middle Danube lacks antecedents of the behavioral steps within this technology, several hypotheses of inter-regional cultural transmission, with and without hominin gene flow, could explain the appearance of the Bohunician. The elucidation of the temporal context of Bohunician assemblages is, therefore, a critical step in understanding the behavioral, and potentially biological, succession in this region. Radiocarbon age estimates from charcoal associated with Bohunician sites suggest a wide age range between 33 and 41 ka 14C BP, which is also observed for individual sites. TL dating of heated flint artifacts provides ages on the calendric time scale of an archeological event, the firing. The weighted mean of 48.2+/-1.9 ka BPTL for 11 heated flint samples from Brno-Bohunice provides the first non-radiocarbon data on archeological material from the Bohunician. The TL dating, in conjunction with the archeological and sedimentological analysis, allows the evaluation of the integrity of this new type-collection. The hypothetical possibility of the incorporation of Szeletian artifacts (i.e., leaf points) into the site formation processes can therefore be refuted. PMID:18951613

  3. Welding electrode for peripheral welds of A-1 reactor pressure vessel

    International Nuclear Information System (INIS)

    The properties are outlined of the VUZ-AC1-52 welding electrode used in welding the Bohunice A-1 reactor pressure vessel. The mechanical properties of welded joints after the final thermal treatment are summed up. (J.K.)

  4. AdapterRemoval v2

    DEFF Research Database (Denmark)

    Schubert, Mikkel; Lindgreen, Stinus; Orlando, Ludovic Antoine Alexandre

    2016-01-01

    BACKGROUND: As high-throughput sequencing platforms produce longer and longer reads, sequences generated from short inserts, such as those obtained from fossil and degraded material, are increasingly expected to contain adapter sequences. Efficient adapter trimming algorithms are also needed to...... process the growing amount of data generated per sequencing run. FINDINGS: We introduce AdapterRemoval v2, a major revision of AdapterRemoval v1, which introduces (i) striking improvements in throughput, through the use of single instruction, multiple data (SIMD; SSE1 and SSE2) instructions and multi......-threading support, (ii) the ability to handle datasets containing reads or read-pairs with different adapters or adapter pairs, (iii) simultaneous demultiplexing and adapter trimming, (iv) the ability to reconstruct adapter sequences from paired-end reads for poorly documented data sets, and (v) native gzip and...

  5. What the A-1 nuclear power plant at Jaslovske Bohunice brought and left to experts, the economy and the environment

    International Nuclear Information System (INIS)

    The construction history is outlined of A-1 at Jaslovske Bohunice, the first Czechoslovak nuclear power plant. Characteristic operating data of the plant in 1972-1977 are presented. The period following the second accident at the plant and its final shutdown is described. The adverse environmental impacts of the plant are characterized. A safe decommissioning of the plant is a problem that remains to be solved. (J.B.)

  6. Analysis of the mortality development of the population in the surroundings of Bohunice NPP using Fuzzy logic methods

    International Nuclear Information System (INIS)

    We pursue the vicinity of Bohunice NPP. The vicinity has cyclic form with radius of 30 km, what represents an area approximately 2 800 km2. This area of pursued vicinity is requisite by the security report of Bohunice NPP. To the presumptive calculations we used the complete databases of Register of death, Register of municipalities and of Register of age structure of the inhabitants of the Slovak republic from 1993 to 1999, fully-fashioned in Statistical authority of the Slovak republic. We work with databases, which don't contain personal identifications. We pursue the evolution of the mortality by the indicators of the mortality, calculated by the WHO. By the literary sources and by our experience is necessary the sum at least of three years to calculation of stable demographic and epidemiological parameters. Therefore we work with the method of short time series. The basic observed unit, which is represented by one value of the indicator, is one municipality. All our assessing analyses are calculated from triennial sums of all indicators, so we work with man-years. Advanced report is the adjusted extract from Complex report on situation of environment and health of the inhabitants in vicinity of Bohunice NPP in 1999, which was advanced by our society in March 2001. (authors)

  7. ITER concept definition. V.2

    International Nuclear Information System (INIS)

    Volume II of the two volumes describing the concept definition of the International Thermonuclear Experimental Reactor deals with the ITER concept in technical depth, and covers all areas of design of the ITER tokamak. Included are an assessment of the current database for design, scoping studies, rationale for concepts selection, performance flexibility, the ITER concept, the operations and experimental/testing program, ITER parameters and design phase schedule, and research and development specific to ITER. This latter includes a definition of specific research and development tasks, a division of tasks among members, specific milestones, required results, and schedules. Figs and tabs

  8. Seismic re-evaluation and upgrading of Bohunice V1 NPP

    International Nuclear Information System (INIS)

    Bohunice V1 in Slovakia is a two unit WWER 440/230 whose units went into commercial operation in 1979 and 1981 respectively. The plant was not initially designed for seismic loading. Later geotechnical studies concluded that the site seismic hazard should be defined as an earthquake of MSK 8 intensity. This relates to approximately 0.25 g peak ground acceleration in the free field at the site. Some early reconstruction to strengthen the plant against earthquakes was done in the early 1990s but did not include all safety significant structures and equipment. In 1996, EBO, the plant operator, entered into a contract with consortium REKON, a Siemens and VUJE joint venture, for a major reconstruction program to update all safety systems required for a safe shutdown, to improve integrity of confinement and assure spent fuel cooling. This reconstruction project includes verification of seismic adequacy of all safety related structures and equipment in the REKON scope which is not being replaced by new construction. Siemens and EQE International are jointly conducting the seismic verification and required upgrading for the existing structures and equipment. Criteria for the verification and upgrading were developed for the project utilizing Technical Guidelines provided by IAEA, Reference 1, and linking them with international and local codes and standards and specific methodologies developed for similar projects in the US and Western Europe. The criteria are briefly discussed herein and are summarized in a companion paper, Reference 4. Because of the major improvements being implemented in safety systems, much of the essential safety related equipment is being directly replaced or completely new systems are being constructed that supersede existing ones. Consequently, a significant amount of the equipment that would normally require seismic adequacy verification is deleted from the verification scope (see Table 4). The reconstruction project will continue through 1999

  9. Retrospective study of 14C concentration in the vicinity of NPP Jaslovské Bohunice using tree rings and the AMS technique

    Science.gov (United States)

    Ješkovský, Miroslav; Povinec, Pavel P.; Steier, Peter; Šivo, Alexander; Richtáriková, Marta; Golser, Robin

    2015-10-01

    Atmospheric radiocarbon has been monitored around the Nuclear Power Plant (NPP) Jaslovské Bohunice (Slovakia) using CO2 absorption in NaOH solution since 1969. In 2012, tree ring samples were collected from Tilia cordata using an increment borer at Žlkovce monitoring station situated close to the Bohunice NPP. Each tree ring was identified and graphite targets were produced for 14C analysis by accelerator mass spectrometry. The 14C concentrations obtained from the tree-ring samples have been in a reasonable agreement with the averaged annual 14C concentrations in atmospheric CO2.

  10. When Swedes Begin to Learn German: From V2 to V2

    Science.gov (United States)

    Bohnacker, Ute

    2006-01-01

    This article investigates verb placement, especially Verb second (V2), in post-puberty second language (L2) learners of two closely related Germanic V2 languages: Swedish and German. Hakansson, "et al." (2002) have adduced data from first language (L1) Swedish-speaking learners of German in support of the claim that the syntactic property of V2

  11. Intercomparison of liquid metal fast reactor seismic analysis codes. V. 2: Verification and improvement of reactor core seismic analysis codes using core mock-up experiments. Proceedings of a research co-ordination meeting held in Vienna, 26-28 September 1994

    International Nuclear Information System (INIS)

    This report (Volume II) contains the papers summarizing the verification of and improvement to the codes on the basis of the French and Japanese data. Volume I: ''Validation of the Seismic Analysis Codes Using the Reactor Code Experiments'' (IAEA-TECDOC-798) included the Italian PEC reactor data. Refs, figs and tabs

  12. Saikosaponin v-2 from Bupleurum chinense

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Saikosaponin v-2(1), was isolated from the roots of the title plant and the structure was identified on the basis of spectral analysis. Saikosaponin v-2 is a new compound, which was identified as 3b,16a,23,28-tetrahydroxy-olean-11,13(18)-dien-30-oic acid-3-O-b-D-glucopyrano- syl-(1?2)glucopyranosyl-(1?3)-b-D-fucopyranosyl-30-O-xylitol ester.

  13. Nuclear power plant (A-1 NPP) SE a.s., Bohunice A-1

    International Nuclear Information System (INIS)

    The A-1 NPP was connected to the grid on 25 December 1972. The first serious refuelling accident happened on 5 April 1976. The second accident occurred on 22 February 1977 when a fouled fuel assembly was overheated, melted, and consequently radioactivity entered the whole primary circuit of steam generators, and a portion of it also leaked into the secondary circuit. The accident was classified as INES 4 level. There were no leaks of radioactivity into environment during the accident. A programme and schedule of bringing the A-1 NPP into a radiation-safe status was precise by subsequent decrees of the Slovak Government in 1993-1994. In January 1995, the Project was submitted to Nuclear Regulatory Authority of the Slovak Republic (NRA SR) and updated schedule of works was approved by the Government of the Slovak Republic. The radiation-safe status is characterised by minimizing of excluding a risk of negative environmental impacts of a NPP. There were 439 of total of 571 spent fuel assemblies transported to the former Soviet Union in 1984 through 1990. The remaining 132 assemblies are 'difficult-to-handle', ones the assemblies can not be taken out of their cases. Current solution the activities associated with transport and improvement of a safe storage of the spent fuel, issues related to processing, treatment, and storage of liquid radioactive wastes is represented by Bohunice treatment centre that has been built since 1993. In addition to Slovak partners, there are also foreign ones who are involved in bringing A-1 NPP into a radiation-safe status. The largest share of works is taken by British AEA Technology together with SGN, France. Other European countries are involved in A-1 NPP decommissioning, too, by providing technical assistance within PHARE programmes. Japan also provides funding of a broad programme of information exchange about NPPs decommissioning. Activities of nuclear safety inspectors were performed according to NRA SR yearly plan of inspection

  14. Sensing Traffic Density Combining V2V and V2I Wireless Communications.

    Science.gov (United States)

    Sanguesa, Julio A; Barrachina, Javier; Fogue, Manuel; Garrido, Piedad; Martinez, Francisco J; Cano, Juan-Carlos; Calafate, Carlos T; Manzoni, Pietro

    2015-01-01

    Wireless technologies are making the development of new applications and services in vehicular environments possible since they enable mobile communication between vehicles (V2V), as well as communication between vehicles and infrastructure nodes (V2I). Usually, V2V communications are dedicated to the transmission of small messages mainly focused on improving traffic safety. Instead, V2I communications allow users to access the Internet and benefit from higher level applications. The combination of both V2V and V2I, known as V2X communications, can increase the benefits even further, thereby making intelligent transportation systems (ITS) a reality. In this paper, we introduce V2X-d, a novel architecture specially designed to estimate traffic density on the road. In particular, V2X-d exploits the combination of V2V and V2I communications. Our approach is based on the information gathered by sensors (i.e., vehicles and road side units (RSUs)) and the characteristics of the roadmap topology to accurately make an estimation of the instant vehicle density. The combination of both mechanisms improves the accuracy and coverage area of the data gathered, while increasing the robustness and fault tolerance of the overall approach, e.g., using the information offered by V2V communications to provide additional density information in areas where RSUs are scarce or malfunctioning. By using our collaborative sensing scheme, future ITS solutions will be able to establish adequate dissemination protocols or to apply more efficient traffic congestion reduction policies, since they will be aware of the instantaneous density of vehicles. PMID:26694405

  15. Sensing Traffic Density Combining V2V and V2I Wireless Communications

    Science.gov (United States)

    Sanguesa, Julio A.; Barrachina, Javier; Fogue, Manuel; Garrido, Piedad; Martinez, Francisco J.; Cano, Juan-Carlos; Calafate, Carlos T.; Manzoni, Pietro

    2015-01-01

    Wireless technologies are making the development of new applications and services in vehicular environments possible since they enable mobile communication between vehicles (V2V), as well as communication between vehicles and infrastructure nodes (V2I). Usually, V2V communications are dedicated to the transmission of small messages mainly focused on improving traffic safety. Instead, V2I communications allow users to access the Internet and benefit from higher level applications. The combination of both V2V and V2I, known as V2X communications, can increase the benefits even further, thereby making intelligent transportation systems (ITS) a reality. In this paper, we introduce V2X-d, a novel architecture specially designed to estimate traffic density on the road. In particular, V2X-d exploits the combination of V2V and V2I communications. Our approach is based on the information gathered by sensors (i.e., vehicles and road side units (RSUs)) and the characteristics of the roadmap topology to accurately make an estimation of the instant vehicle density. The combination of both mechanisms improves the accuracy and coverage area of the data gathered, while increasing the robustness and fault tolerance of the overall approach, e.g., using the information offered by V2V communications to provide additional density information in areas where RSUs are scarce or malfunctioning. By using our collaborative sensing scheme, future ITS solutions will be able to establish adequate dissemination protocols or to apply more efficient traffic congestion reduction policies, since they will be aware of the instantaneous density of vehicles. PMID:26694405

  16. Hadoop MapReduce v2 cookbook

    CERN Document Server

    Gunarathne, Thilina

    2015-01-01

    If you are a Big Data enthusiast and wish to use Hadoop v2 to solve your problems, then this book is for you. This book is for Java programmers with little to moderate knowledge of Hadoop MapReduce. This is also a one-stop reference for developers and system admins who want to quickly get up to speed with using Hadoop v2. It would be helpful to have a basic knowledge of software development using Java and a basic working knowledge of Linux.

  17. Reactors

    International Nuclear Information System (INIS)

    Purpose: To provide a spray cooling structure wherein the steam phase in a bwr reactor vessel can sufficiently be cooled and the upper cap and flanges in the vessel can be cooled rapidly which kept from direct contaction with cold water. Constitution: An apertured shielding is provided in parallel spaced apart from the inner wall surface at the upper portion of a reactor vessel equipped with a spray nozzle, and the lower end of the shielding and the inner wall of the vessel are closed to each other so as to store the cooling water. Upon spray cooling, cooling water jetting out from the nozzle cools the vapor phase in the vessel and then hits against the shielding. Then the cooling water mostly falls as it is, while partially enters through the apertures to the back of the shielding plate, abuts against stoppers and falls down. The stoppers are formed in an inverted L shape so that the spray water may not in direct contaction with the inner wall of the vessel. (Horiuchi, T.)

  18. WMOST v2 Case Study: Monponsett Ponds

    Science.gov (United States)

    This webinar presents an overview of the preliminary results of a case study application of EPA's Watershed Management Optimization Support Tool v2 (WMOST) for stakeholders in the Monponsett Ponds Watershed Workgroup. Monponsett Ponds is a large water system consisting of two ba...

  19. Investigation of reactor pressure vessel steels after radiation degradations

    International Nuclear Information System (INIS)

    The degradation of reactor pressure vessel (RPV) steel is a complex process depending on many factors (thermal and radiation treatment, chemical compositions, preparing conditions, ageing, operation environment, etc.). This paper describes tests based on Nondestructive Methods used for evaluation of material characterisation at Slovenske Elektrarne a.s. Positron Annihilation Spectroscopy (PAS), Moessbauer Spectroscopy (MS) and Transmission Electron Microscopy (TEM) investigate microstructure changes of Reactor Pressure Vessel steels caused neutrons irradiation. There are showed results of investigation of reactor pressure vessel steel specimens after five years irradiation in reactor nature by mentioned NDT methods. Investigated specimens has been prepared for the Extended surveillance specimen program which has run out on the 3rd and 4th units of NPP Jaslovske Bohunice and for the Modified surveillance specimen program in the 1st and 2nd unit which is continued in NPP Mochovce (Slovakia). PAS and MS spectra showed that the degradation of the steel properties associated with the effects of neutron irradiation can be well detected. The samples from RPV base metal (15Kh2MFA) and weld metal (Sv 10KhMFT) were measured by PAS and MS before and after irradiation. Samples have been irradiated in VVER-440 reactor (units 3rd and 4th in Bohunice as well as 1st and 2nd units Mochovce) by neutron fluency from 7.8 1023 m-2 up to 2.5 1024 m-2. Measurement results are presented and discussed in detail.(author)

  20. A conceptual V2G aggregation platform

    OpenAIRE

    João C. Ferreira; Afonso, João L.

    2012-01-01

    In this work is proposed the design of a system to create and handle an Electric Vehicle (EV) community, based on social networks collaborative approach and a credit mechanism to incentive participation and divide profits. This system is part of a V2G (Vehicle-to-Grid) module that allows EV owners to be aggregated in communities and participate in the electricity market. With this system it is possible for the EV owners to win money while the EVs are parked and plugged, delivering...

  1. Borate compound content reduction in liquid radioactive waste from nuclear power plants with VVER reactor

    International Nuclear Information System (INIS)

    This paper describes the current status of liquid waste (evaporator concentrates) inventory at V-1 and V-2 NPPs in Jaslovske Bohunice and the intention to separate boron from them with respect to waste minimisation and improvement of physical and chemical properties for further waste treatment and conditioning. Preliminary results of laboratory experiments concerned to borate crystallisation after pH adjustment with nitric or formic acid performed in the 1998 are given. At the present time laboratory experiments continuing - next acids, coagulation with carbon oxide, electrolytic process, ion exchange resin, study of decontamination factors, immobilization of boric acid, decrease radioactivity, purification of boron-contained compounds. Slovenske Elektrarne have accumulated 7,000 m3 of evaporator concentrates containing 100-180 g/l borate. In order to make more storage space available, it is proposed to remove some of the borate in the liquor by precipitation as sodium tetraborate and immobilise in either cement of bitumen. The supernate can be further volume reduced by evaporation and returned to the tanks. Slovenske Elektrarne are currently evaluating acid addition to the pH 12-13 concentrate to reduce the borate solubility. However, this adds to the salt burden of the waste through this chemical addition -thus creating future increases in conditioning and disposal costs. Boric acid is used in pressurized water as a soluble neutron poison to control reactivity and also to assure a safety margin in the spent fuel pool and during refuelling operations. Boric acid is also present in the water reserved for injection into the reactor in the event of postulated accidents. (author)

  2. Findings from measurement of vertical displacement of V-1 nuclear power plant buildings in Jaslovske Bohunice

    International Nuclear Information System (INIS)

    Vertical displacements were measured of the foundations and of selected bearing structures of the V-1 nuclear power plant buildings during the plant's construction and operation. Measured were displacements of the engine room foundations, the reactor building, the boron management building, the turbogenerator building, the cooling towers, the ventilation stack, and the foundations of buildings showing adverse properties. Some results are presented. (E.J.). 4 figs., 2 refs

  3. ITER EDA newsletter. V. 2, no. 9

    International Nuclear Information System (INIS)

    This ITER EDA (Engineering Design Activities) Newsletter issue contains a report on the third meeting of the ITER Technical Advisory Committee, a summary report for the ITER Magnetic Technical Meeting, a brief account of the International Workshop on Nuclear Data for Fusion Reactor Technology, and a description of approved arrangements for visiting home team personnel

  4. Implementation of results of science and technology development project ''Automated system of nuclear power plant control'' at the Bohunice plant

    International Nuclear Information System (INIS)

    The implementation of the automated control system at the Jaslovske Bohunice nuclear power plant is taking place in two stages. In the first stage the main computer centre was built with an ES 1055 M computer which has been in operation since January 1985. In the following year, 6 local network terminals of type ES 7927 were installed and one multiplexer ES 8371 for the control of the network. All the equipment operates reliably, the ES 7039 printers are not so reliable. The weakest element are large-size magnetic disc memories. In the next stage, the construction is envisaged of a terminal network with SM 4-20 and SM 52/11 computers and 7202 terminals. The contribution of the implementation of computer technology so far has been in the field of maintenance where it has allowed to centrally plan repairs of some 15,000 items and to coordinate the activities of sub-contractors. Also positive are results in the field of measurement and control technology where the reliability is being evaluated of some 20,000 measurement circuits and elements, and their preventive maintenance and repairs planned. Briefly summed up are items for further increasing the contribution of the deployment of computer technology in nuclear power plants. (Z.M.)

  5. Selective Leaching of aerosol particles collected by cascade impactor in the ventilation stack of NPP V1 in Jaslovske Bohunice

    International Nuclear Information System (INIS)

    The study was apart of investigation of the size distribution of aerosol in air effluents from NPP V1 Jaslovske Bohunice. The evaluation the possible relationship between aerodynamic diameter of aerosol particles and chemical forms of radionuclides attached to the discharged aerosol was tried. Selective leaching was used for speciation of radionuclides present in the aerosol particles and for the estimation of their behaviour in the environment and absorption in gastro-intestinal tract. Activity concentrations of the radionuclides in the air, collected on collection substrates taken from individual impact stages and on back-up filter, were determined by sensitive gamma-spectrometric analysis using high purity Ge detectors. For the individual groups seven leaching steps were used. Following 12 radionuclides: silver-110m, cobalt-58, cobalt-60, cesium-134, cesium-137, manganese-54, ruthenium-103, antimony-124, antimony-125, tin-113, zinc-65, zirconium-95. Result shows that the leached fraction of the of the activity concentration does not depend on the size of the aerosol particles. (J.K.) 3 tabs., 3 figs

  6. Positron annihilation studies of neutron irradiated and thermally treated reactor pressure vessel steels

    International Nuclear Information System (INIS)

    Positron annihilation lifetime measurements using the pulsed low energy positron system (PLEPS) were applied for the first time for the investigation of defects of irradiated and thermally treated reactor pressure vessel (RPV) steels. PLEPS results showed that the changes in the microstructure of the RPV-steel properties caused by neutron irradiation and post-irradiation thermal treatment can be detected. The samples originated from the Russian 15Kh2MFA and Sv10KhMFT steels, commercially used at WWER-440 reactors, were irradiated near the core at NPP Bohunice (Slovakia) to neutron fluences in the range from 7.8x1023 to 2.5x1024 m-2

  7. Sipping equipment for leak testing of fuel assemblies in VVER-440 reactors

    International Nuclear Information System (INIS)

    Sipping equipment for the Soviet-type VVER-440 pressurized water reactors was developed on the basis of the proven in-core sipping technique used for boiling water reactor fuel assemblies. The main components of the system are the sipping hood with seven test positions, the control panel for system operation and sample collection, and the manifold connection line. During testing the upper ends of the hexagonal fuel assemblies are lifted into the air-filled sipping hood to interrupt the coolant flow by means of pneumatically actuated grippers. The first equipment of this kind has been in use in the nuclear plant Jaslovske-Bohunice, Czechoslovakia, since 1986. (orig.)

  8. SIMone user's manual. V. 2.1

    International Nuclear Information System (INIS)

    Simone is a computer application program which provides an environment in which to run the nuclear reactor thermal hydraulic simulation code RELAP5. It enables users to run a RELAP5 calculation on-line on a SUN4 workstation, and provides an interactive means of executing operator-like actions. In addition, a version of the graphical post-processing tool ISOVU is incorporated, allowing a real-time display of the RELAP5 calculation to be presented in the form of a system mimic diagram. This report comprises a description of the facilities available within the Simone application, and a user guide describing the user interface. (author)

  9. The Verb Always Leaves IP in V2 Clauses

    DEFF Research Database (Denmark)

    Schwartz, Bonnie D.; Vikner, Sten

    2007-01-01

    The verb second (V2) phenomenon, as it is found in the Germanic languages, has been the focus of much attention within recent syntactic research. In most of the literature on V2, it is assumed that the verb in all V2 clauses has moved to a head position outside IP, e.g. Cº. In Schwartz & Vikner...

  10. Advanced CA technologies and remotely controlled manipulators used for the decontamination of the A-1 NPP Jaslovske Bohunice, Slovak Republic

    International Nuclear Information System (INIS)

    This paper deals with the main activities and results of the Nuclear Power Plants Research Institute (VUJE) Trnava in the fields of development of remotely operated manipulators and robots for decontamination and dismantling. D and D of the Active Water Purifying Station (AWPS) of A-1 NPP Jaslovske Bohunice was chosen as a pilot project for the application of advanced CA technologies and manipulators for D and D tasks. The presence of radioactive, toxic or hazardous materials limits personnel access to facilities. Very often there are not enough up-to-date drawings of the installed technology. Therefore, in preparation phase of decontamination, a 3D Laser scanner and software 3Dipsos were involved as modelling technology and civil construction of the facility. Examples of acquired data and created 3D models are presented. Many D and D tasks have to be performed remotely. This paper describes the main features of developed remotely controlled manipulators. A movable manipulator MT-15 is dedicated for recognition and analysing tasks in hostile environment. A general purpose manipulator MT-80 is used for heavy duties in D and D. A long reach manipulator DENAR-41 was developed for the decontamination of underground waste storage tanks. Mock up tests of the afore-mentioned manipulators were performed before they were used in D and D tasks. Moreover the software EUCLID and IGRIP are used for simulation, analysing and optimisation of decontamination or dismantling tasks. This procedure leads to safe and more effective realisation of decontamination and dismantling tasks. The obtained results are also used for future development of suitable manipulators. The description of the initial and present state of contamination and radiation level in AWPS is presented in this paper. Experience with utilisation of advanced CA technology for acquiring as built models, development of manipulators and simulation of D and D tasks are described. (author)

  11. Diagnostics of components of primary and secondary circuits of WWER-440 nuclear power plants

    International Nuclear Information System (INIS)

    A brief description is presented of the monitoring diagnostic system installed in both units of the V-1 nuclear power plant in Jaslovske Bohunice. The system manufactured by Brueel and Kjaer, Denmark, operates on the principle of evaluating vibroacoustic signals from selected components of the primary and secondary circuits. Both reactors of the V-2 nuclear power plant in Jaslovske Bohunice are equipped with similar systems manufactured by West German company KWU and home manufacturers. (Z.M.)

  12. Potential performance analysis and future trend prediction of electric vehicle with V2G/V2H/V2B capability

    Directory of Open Access Journals (Sweden)

    Dalong Guo

    2016-03-01

    Full Text Available Due to the intermittent nature, renewable energy sources (RES has brought new challenges on load balancing and energy dispatching to the Smart Grid. Potentially served as distributed energy storage, Electric Vehicle’s (EV battery can be used as a way to help mitigate the pressure of fluctuation brought by RES and reinforce the stability of power systems. This paper gives a comprehensive review of the current situation of EV technology and mainly emphasizing three EV discharging operations which are Vehicle to Grid (V2G, Vehicle to Home (V2H, and Vehicle to Building (V2B, respectively. When needed, EV’s battery can discharge and send its surplus energy back to power grid, residential homes, or buildings. Based on our data analysis, we argue that V2G with the largest transmission power losses is potentially less efficient compared with the other two modes. We show that the residential users have the incentive to schedule the charging, V2G, and V2H according to the real-time price (RTP and the market sell-back price. In addition, we discuss some challenges and potential risks resulting from EVs’ fast growth. Finally we propose some suggestions on future power systems and also argue that some incentives or rewards need to be provided to motivate EV owners to behave in the best interests of the overall power systems.

  13. 2-minute Gridded Global Relief Data (ETOPO2) v2

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Two-minute gridded global relief for both ocean and land areas are available in the ETOPO2v2 (2006) database. ETOPO2v2 replaced ETOPO2 (2001). The historic 2-minute...

  14. Mineralogical determination, distribution ration, speciation and radionuclides mobility in soil samples from objects 41 and 44/10 NPP Jaslovske Bohunice

    International Nuclear Information System (INIS)

    Mineralogical characterization of a soil from the Nuclear Power Plant Jaslovske Bohunice object 41 and 44/10 was performed by x-ray diffraction method and surface measuring. It was find that the main component was smectite but other minerals like quartz, illite, chlorite and K-feldspar, were observed. Sorption and speciation of 137Cs, 85Sr, 241Am and 60Co in the mix soil was done with continuous leaching and Tessier scheme. It was found that distribution ration for Co and Cs is the highest. Strontium was in ionic form, Cs was leached with nitric acid, americium was fixed on carbonate fraction and cobalt was predominantly leached with reduction solutions as can be observed from the Tessier sequence method. Sorption of iodine on the soil used in the experiment was negligible (authors)

  15. Increasing of leak-tightness of hermetic zone and other important components in NPPs

    International Nuclear Information System (INIS)

    The performed by VUEZ resealing works in the hermetic compartments/containment of WWER 440 and WWER 1000 NPPs in Slovakia (Jaslovske Bohunice V-1 NPP, Jaslovske Bohunice V-2 NPP, Mochovce NPP), the Czech Republic (Dukovany NPP, Temelin NPP) and Hungary (Pask NPP) are presented. The leakage rate from hermetic compartments at individual NPP reactor units are shown.The VUEZ activities in field of resealing of weld joints in pools and tanks in the Jaslovske Bohunice V-1 NPP and innovation of the seal of reactor pit protective hood (kolpak) are described. The principle of operation and practical experience of the SMU-V system implemented in the Jaslovske Bohunice V-1 NPP (WWER 440 - V 230) for NPP primary circuit leakage monitoring are also given

  16. An Orientation Map for Motion Boundaries in Macaque V2.

    Science.gov (United States)

    Chen, Ming; Li, Peichao; Zhu, Shude; Han, Chao; Xu, Haoran; Fang, Yang; Hu, Jiaming; Roe, Anna W; Lu, Haidong D

    2016-01-01

    The ability to extract the shape of moving objects is fundamental to visual perception. However, where such computations are processed in the visual system is unknown. To address this question, we used intrinsic signal optical imaging in awake monkeys to examine cortical response to perceptual contours defined by motion contrast (motion boundaries, MBs). We found that MB stimuli elicit a robust orientation response in area V2. Orientation maps derived from subtraction of orthogonal MB stimuli aligned well with the orientation maps obtained with luminance gratings (LGs). In contrast, area V1 responded well to LGs, but exhibited a much weaker orientation response to MBs. We further show that V2 direction domains respond to motion contrast, which is required in the detection of MB in V2. These results suggest that V2 represents MB information, an important prerequisite for shape recognition and figure-ground segregation. PMID:25260703

  17. The most extensive reconstruction of nuclear power plant with VVER 440/V230 reactor

    International Nuclear Information System (INIS)

    The nuclear power plant V-1 Bohunice consists of two VVER-440 units with V-230 reactors. Unit 1 was commissioned in 1978 and Unit 2 in 1980. Large experience and knowledge from the operation of previous units with V-230 reactors were incorporated into the V-1 design, which resulted in a higher level of safety and operational reliability of these units. The Siemens company which won an international bidding process developed these basic goals for the Gradual Upgrading into the so called Basic Engineering (BE). For the implementation of the Gradual Upgrading in line with the BE, Rekon consortium was established consisting of Siemens and VUJE. The implementation of the Gradual Upgrading is scheduled for the time period of 1996 - 2000. Siemens was responsible for the upgrading strategy - based on the approved results of the basic engineering phase and the PSAR, the engineering and realization of all I and C improvements, and also for the seismic upgrade. VUJE's responsibility covered the detailed engineering and implementation of mechanical, electrical and civil part of upgrading measures as well as overall organisation and evaluation of verification tests. The consortium awarded contracts for final planning and design, installation services and commissioning to other Slovakian subcontractors in order to ensure the largest possible local content. The gradual reconstruction of the V-1 Bohunice with V230 reactors represents a comprehensive reconstruction of safety-related systems and equipment. Following its completion, the units will be operated with a safety level accepted internationally. (author)

  18. Ionic conduction in different hydrated V2O5 film

    Science.gov (United States)

    Saatci, A. Evrim; Gökdemir, F. Pınar; Menda, U. Deneb; Kavak, Pelin; Özdemir, Orhan; Kutlu, Kubilay

    2012-09-01

    Because of the layered structure of vanadium pentoxide films (V2O5), approved by XRD measurement, sensitized from different hydrated V2O5.nH2O sols, demonstrated anisotropic conductivities in current voltage (I-V) measurement. Conductivity values, originated from electronic and ionic conductions, differed provided that measurements were performed in a direction parallel to the ribbons rather than perpendicular to them. The overall electrical conductivity of V2O5nH2O sols mainly depended on the hydration state n and the amount of reduced V4+ ions in which n was determined around 4-6 [1] from the basal distance (17.6 Å) through XRD measurement while V4+ ions were determined through FTIR analysis. Electronic conduction prevailed in dehydrated V2O50.5H2O sols whereas non-stoichiometric vanadium pentoxide was a mixed-valence compound and its electronic properties arised from electron hopping between V4+ and V5+ ions so-called "small polaron model". Indeed, reduction/oxidation peaks in lithium (Li+) intercalation by cyclic voltammograms (CV) indicated the V4+ and V5+ ions in V2O5 sols. Temperature dependent I-V analysis showed Arheniuss type activation energy, EA, and located in between 0.3-0.5 eV; proposing ionic conduction rather than electronic conduction, specifically proton diffusion in V2O5 film. Indeed, hydration state greater than 0.5 predicted ionic conduction [1].

  19. Epitope mapping of conformational V2-specific anti-HIV human monoclonal antibodies reveals an immunodominant site in V2.

    Directory of Open Access Journals (Sweden)

    Luzia M Mayr

    Full Text Available In the case-control study of the RV144 vaccine trial, the levels of antibodies to the V1V2 region of the gp120 envelope glycoprotein were found to correlate inversely with risk of HIV infection. This recent demonstration of the potential role of V1V2 as a vaccine target has catapulted this region into the focus of HIV-1 research. We previously described seven human monoclonal antibodies (mAbs derived from HIV-infected individuals that are directed against conformational epitopes in the V1V2 domain. In this study, using lysates of SF162 pseudoviruses carrying V1V2 mutations, we mapped the epitopes of these seven mAbs. All tested mAbs demonstrated a similar binding pattern in which three mutations (F176A, Y177T, and D180L abrogated binding of at least six of the seven mAbs to ≤15% of SF162 wildtype binding. Binding of six or all of the mAbs was reduced to ≤50% of wildtype by single substitutions at seven positions (168, 180, 181, 183, 184, 191, and 193, while one change, V181I, increased the binding of all mAbs. When mapped onto a model of V2, our results suggest that the epitope of the conformational V2 mAbs is located mostly in the disordered region of the available crystal structure of V1V2, overlapping and surrounding the α4β7 binding site on V2.

  20. Proceedings of the U.S. Nuclear Regulatory Commission on the fifteenth water reactor safety information meeting. V. 2. Materials engineering/pressure vessel research; materials engineering/radiation and degraded piping effects; non-destructive evaluation; environmental effects in primary systems

    International Nuclear Information System (INIS)

    This six-volume report contains 140 papers out of the 164 that were presented at the fifteenth water reactor safety information meeting held at the National Bureau of Standards, Gaithersburg, Maryland, during the week of October 26-29, 1987. The papers are printed in the order of their presentation in each session and describe progress and results of programs in nuclear safety research conducted in this country and abroad. Foreign participation in the meeting included twenty-two different papers presented by researchers from Belgium, Czechoslovakia, Germany, Italy, Japan, Russia, Spain, Sweden, The Netherlands and the United Kingdom. The titles of the papers and the names of the authors have been updated and may differ from those that appeared in the final program of the meeting. (author)

  1. Input modelling of ASSERT-PV V2R8M1 for RUFIC fuel bundle

    International Nuclear Information System (INIS)

    This report describes the input modelling for subchannel analysis of CANFLEX-RU (RUFIC) fuel bundle which has been developed for an advanced fuel bundle of CANDU-6 reactor, using ASSERT-PV V2R8M1 code. Execution file of ASSERT-PV V2R8M1 code was recently transferred from AECL under JRDC agreement between KAERI and AECL. SSERT-PV V2R8M1 which is quite different from COBRA-IV-i code has been developed for thermalhydraulic analysis of CANDU-6 fuel channel by subchannel analysis method and updated so that 43-element CANDU fuel geometry can be applied. Hence, ASSERT code can be applied to the subchannel analysis of RUFIC fuel bundle. The present report was prepared for ASSERT input modelling of RUFIC fuel bundle. Since the ASSERT results highly depend on user's input modelling, the calculation results may be quite different among the user's input models. The objective of the present report is the preparation of detail description of the background information for input data and gives credibility of the calculation results

  2. AC impedance studies of V2O5 containing glasses

    International Nuclear Information System (INIS)

    Glasses with composition V2O5-BaO-MO-B2O3(MO=SiO2,GeO2,P2O5) were studied using AC impedance analyzer. The measurements show that conductivities increase with V2O5 contents, and the P2O5 containing glasses have higher conductivities. The electric modulus was analyzed based on the Kohlrausch-Williams-Watts (KWW) relaxation function, φ(t)=exp[-(t/τ0)1-n]. The exponent n increases with V2O5 content. In addition, as the temperature approaches glass transition temperature, n increases with temperature. The results are interpreted in terms of Ngai's coupling model when applied to polaron conductivity relaxation

  3. V2 word order in subordinate clauses in spoken Danish

    DEFF Research Database (Denmark)

    Jensen, Torben Juel; Christensen, Tanya Karoli

    asymmetrically distributed, we argue that the word order difference should rather be seen as a signal of (subtle) semantic differences. In main clauses, V3 is highly marked in comparison to V2, and occurs in what may be called emotives. In subordinate clauses, V2 is marked and signals what has been called...... studies of two age cohorts of speakers in Copenhagen, recorded in the 1980s and again in 2005-07, and on recent recordings with two age cohorts of speakers from the western part of Jutland. This makes it possible to study variation and change with respect to word order in subordinate clauses in both real...... and apparent time, as well as geographical variation. The results show that V2 word order in subordinate clauses is much more frequent than commonly assumed. Furthermore, they indicate that the most decisive factors predicting word order in subordinate clauses are the syntactic function of the clause...

  4. Substrate effects on V 2O 3 thin films

    Science.gov (United States)

    Schwingenschlögl, Udo; Frésard, Raymond; Eyert, Volker

    2009-01-01

    We apply density functional theory and the augmented spherical wave method to analyze the electronic structure of V 2O 3 in the vicinity of an interface to Al 2O 3. The interface is modeled by a heterostructure setup of alternating vanadate and aluminate slabs. We focus on the possible modifications of the V 2O 3 electronic states in this geometry, induced by the presence of the aluminate layers. In particular, we find that the tendency of the V 3 d states to localize is enhanced and may even cause a metal-insulator transition.

  5. A Innovative Engineering Summer School V2.0

    DEFF Research Database (Denmark)

    Bennedsen, Jens; Larsen, Peter Gorm

    2010-01-01

    This article describes a summer school which focuses on a conceive-design project. The summer school has been run three times; each of the implementations is described. The last implementation (v2.0) is discussed and four challenges are identified and discussed in detail: assignments, the role of...

  6. Selectivity and tolerance for visual texture in macaque V2.

    Science.gov (United States)

    Ziemba, Corey M; Freeman, Jeremy; Movshon, J Anthony; Simoncelli, Eero P

    2016-05-31

    As information propagates along the ventral visual hierarchy, neuronal responses become both more specific for particular image features and more tolerant of image transformations that preserve those features. Here, we present evidence that neurons in area V2 are selective for local statistics that occur in natural visual textures, and tolerant of manipulations that preserve these statistics. Texture stimuli were generated by sampling from a statistical model, with parameters chosen to match the parameters of a set of visually distinct natural texture images. Stimuli generated with the same statistics are perceptually similar to each other despite differences, arising from the sampling process, in the precise spatial location of features. We assessed the accuracy with which these textures could be classified based on the responses of V1 and V2 neurons recorded individually in anesthetized macaque monkeys. We also assessed the accuracy with which particular samples could be identified, relative to other statistically matched samples. For populations of up to 100 cells, V1 neurons supported better performance in the sample identification task, whereas V2 neurons exhibited better performance in texture classification. Relative to V1, the responses of V2 show greater selectivity and tolerance for the representation of texture statistics. PMID:27173899

  7. Pion form factor in the range -10 GeV^2 < s < 1 GeV^2

    CERN Document Server

    Achasov, N N

    2012-01-01

    Based on the field-theory-inspired approach, a new expression for the pion form factor F_pi is proposed. It takes into account the pseudoscalar meson loops $\\pi^+\\pi^-$ and $K\\bar K$ and the mixing of $\\rho(770)$ with heavier $\\rho(1450)$ and $\\rho(1700)$ resonances. The expression possesses correct analytical properties and describes the data in the wide range of the energy squared $-10{GeV}^2\\leq s\\leq1$ GeV$^2$ without introducing the phenomenological Blatt -- Weisskopf range parameter $R_\\pi$.

  8. DEPOSITION VELOCITY ESTIMATION WITH THE GENII V2 SOFTWARE

    Energy Technology Data Exchange (ETDEWEB)

    Hutchins, H.

    2012-04-23

    In 2010, the Department of Energy (DOE) Chief of Nuclear Safety and Office of Health, Safety and Security (HSS), with the support of industry experts in atmospheric sciences and accident dose consequences analysis, performed detailed analyses of the basis for the dry deposition velocity (DV) values used in the MACCS2 computer code. As a result of these analyses, DOE concluded that the historically used default DV values of 1 centimeter/second (cm/s) for unfiltered/unmitigated releases and 0.1 cm/s for filtered/mitigated releases may not be reasonably conservative for all DOE sites and accident scenarios. HSS recently issued Safety Bulletin 2011-02, Accident Analysis Parameter Update, recommending the use of the newly developed default DV, 0.1 cm/s for an unmitigated/unfiltered release. Alternatively site specific DV values can be developed using GENII version 2 (GENII v2) computer code. Key input parameters for calculating DV values include surface roughness, maximum wind speed for calm, particle size, particle density and meteorological data (wind speed and stability class). This paper will include reasonably conservative inputs, and a truncated parametric study. In lieu of the highly-conservative recommended DV value (0.1cm/s) for unmitigated/unfiltered release, GENII v2 has been used to justify estimated 95th percentile DV values. Also presented here are atmospheric dilution factors ({chi}/Q values) calculated with the MACCS2 code using the DV values form GENII v2, {chi}/Q values calculated directly with GENII v2, and a discussion of these results compare with one another. This paper will give an overview of the process of calculating DV with GENII v2 including a discussion of the sensitivity of input parameters.

  9. Chapter No.3. Assessment and inspection of nuclear installations

    International Nuclear Information System (INIS)

    The assessment activity of UJD in relation to nuclear installation lies in assessment of safety documentation for constructions realised as nuclear installations, or construction through which changes on nuclear installations are realised. The assessment activity of UJD in 2001 was focused on National Repository of Radwaste in Mochovce, on Radwaste conditioning and treatment technology in Jaslovske Bohunice and on the assessment of documentation for the project of modernisation of Bohunice V-2 NPPs which is under preparation. The assessment of the technical condition of equipment, important in terms of nuclear safety, primarily based on results of in-service inspections and surveillance testing of safety related components and systems, is also a part of the safety assessment of nuclear installation operation. The inspectors take part in training courses and participate in other technical meetings and workshops organised by the IAEA and also take part in special training courses organised by the Nuclear Authorities of European countries, USA and Japan. Bohunice V-1 NPP is equipped with two reactors of WWER 440 type V-230 and was put into operation in 1978-1980 as one of the last nuclear power plants with this type of reactor. Both units of NPP V-1 Bohunice operated in 2001 according to the requirements of energy dispatching at nominal power, or in a regime of tertiary regulation. November 2000, a mission of experts invited by UJD and delegated by IAEA took place at the Bohunice NPPs. The mission members together with experts of the plant operator assessed the safety of the units of WWER-440/V-230 of Bohunice V-1 NPP after the reconstruction. The members of the mission prepared the report on the current status of safety of these units for the IAEA. In 2001, UJD by its decision, issued the approval for further operation of both reactor units of Bohunice V-1 NPP. In sense of the relevant decree on operational events, 20 events have been recorded, at Bohunice V-1 NPP in

  10. Structure of Na0.56V2O5

    International Nuclear Information System (INIS)

    Mr=194.75, monoclinic, C2/m, a=11.663(9), b=3.6532(7), c=8.92(1) A, β=90.91(4)deg, V=379.9(7) A3, Z=4, Dx=3.405 Mg m-3, Mo Kα, λ=0.71073 A, μ=4.774 mm-1, F(000)=368.64, room temperature, final R=0.056 for 1234 unique observed reflections. Distorted octahedra of VO6 are linked together to form V2O5 layers parallel to (001). Na ions are situated between the layers and surrounded by seven O atoms. The structure is closely related to that of δ-Ag1-xV2O5. (orig.)

  11. Testing the QA Method for Calculating Jet v_{2}

    CERN Document Server

    Mueller, Jason

    2014-01-01

    For the summer, I was assigned to work on the ALICE experiment with Alice Ohlson. I wrote several programs throughout the summer that were used to calculate jet v 2 using a non-standard method described by my supervisor in her Ph.D. thesis. Though the project is not yet complete, significant progress has been made, and the results so far seem promising.

  12. Orientation domain diversity in macaque area V2

    OpenAIRE

    Roe, Anna

    2014-01-01

    Benjamin M Ramsden,1 Chou P Hung,2 Anna Wang Roe3 1Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN, USA; 2Department of Neuroscience, Georgetown University Medical Center, Washington, DC, USA; 3Department of Psychology, Vanderbilt University, Nashville, TN, USA Abstract: Single orientation domains in primary (V1) and second (V2) visual cortical areas are known to encode the orientation of visual contours. However, the visual world contains multiple and com...

  13. CODAR Viewer - A V2V Communication Awareness Display

    OpenAIRE

    Kranz, Matthias; Röckl, Matthias; Franz, Andreas; Strang, Thomas

    2008-01-01

    The CODAR System is a simulation and visualization toolbox for vehicle-to-vehicle communication. In this paper, we introduce the visualization component, the CODAR Viewer, as context information display. It visualizes communication, creates awareness and provides situation information. Visualized vehicle-to-x (V2X) communication data provides additional information, increasing safety and allowing more informed driving decisions if adequately presented to the driver with respect to the current...

  14. Study on the decomposition of trace benzene over V2O5–WO3/TiO2-based catalysts in simulated flue gas

    Science.gov (United States)

    Trace levels (1 and 10 ppm) of gaseous benzene were catalytically decomposed in a fixed-bed catalytic reactor with monolithic oxides of vanadium and tungsten supported on titanium oxide (V2O5–WO3/TiO2) catalysts under conditions simulating the cooling of waste incineration flue g...

  15. Solving the $R_{AA}\\otimes v_2$ puzzle

    CERN Document Server

    Noronha-Hostler, Jacquelyn

    2016-01-01

    For the past ten years $R_{AA}(p_T)$, the nuclear modification factor that encodes the suppression of high $p_T$ particles due to energy loss within the medium was fairly well described by many theoretical models. However, the same models systematically under-predicted the high $p_T$ elliptic flow, $v_2$, which is experimentally measured as the correlation between soft and hard hadrons. All previous calculations neglected the effect of event-by-event fluctuations of an expanding viscous hydrodynamical background as well as the soft-hard flow harmonic correlations in the experimentally measured $v_2$. In this talk I show how event-by-event viscous hydrodynamics (computed using the v-USPhydro code) coupled to an energy loss model (BBMG) is able to simultaneously describe soft physics observables as well as the high-$p_T$ $R_{AA}$ and $v_2$. Suggestions for future more differential calculations at the LHC run2 are made to explore soft-hard flow correlations.

  16. Radiation damage features V-2.5Zr-0.35C alloy welds

    International Nuclear Information System (INIS)

    We have carried out irradiation studies of base metal and welds of V-2.5Zr-0.35C alloy in the BOR-60 reactor in a 7Li environment at temperatures of 540 to 820 C for doses of 43-60 dpa. The welding was made by tungsten electrodes under Ar or He atmosphere. The welding zone is in the middle of the flat tensile specimens. The rupture of the specimens was in the base metal both before and after the irradiation while the radiation damage character of the welding zone differed drastically from the base metal. With the help of TEM investigation it was shown that during the irradiation, intensive precipitation of the fine phase occurred. This phase was of cubic type, presumably VC and/or ZrC, less than 5 nm in size and of 3.1016 cm-3 density. This should lead to significant strengthening and embrittlement of the welds under irradiation. (orig.)

  17. Appendices

    International Nuclear Information System (INIS)

    A survey of nuclear materials seized on the territory of Slovak Republic as well as survey of main economic indicators of Nuclear Regulatory Authority of the Slovak Republic (NRA SR) in 1995 are presented. Graphic presentation of the operation history of Bohunice V-1 and V-2 reactors as well as statistically data are given

  18. Safety of nuclear installations in the Slovak Republic

    International Nuclear Information System (INIS)

    This report describes all nuclear installations in the Slovak Republic. It informs the public about the safety of nuclear installations. The spent fuel activities and nuclear wastes storage matters are discussed separately ((NPP Bohunice V-1, NPP Bohunice V-2, NPP Mochovce, NPP Bohunice A-1, Radioactive wastes repository Mochovce, Interim spent fuel storage Bohunice)

  19. Nuclear Reactors

    Energy Technology Data Exchange (ETDEWEB)

    Hogerton, John

    1964-01-01

    This pamphlet describes how reactors work; discusses reactor design; describes research, teaching, and materials testing reactors; production reactors; reactors for electric power generation; reactors for supply heat; reactors for propulsion; reactors for space; reactor safety; and reactors of tomorrow. The appendix discusses characteristics of U.S. civilian power reactor concepts and lists some of the U.S. reactor power projects, with location, type, capacity, owner, and startup date.

  20. Monitoring of water level inside reactor pressure vessel

    International Nuclear Information System (INIS)

    Up to the TMI accident the water level inside the pressurizer was used to monitor the water inventory inside the primary cooling system of pressurized water reactors. The TMI accident showed that this was not a reliable measurement for the reactor coolant inventory inside the reactor pressure vessel. For this reason there was a demand for a measurement of the water level inside the RVP, independent from the existing one inside the pressurizer and with a diverse measuring method. For WWER reactors a new level measurement system was developed to monitor the water level inside the reactor pressure vessel by means of the KNITU, resp. KITU level probe which meet all the mentioned engineered safeguards and geometric and constructive requirements. First backfitting s of the new level measurement system in the WWER s 440 in Bohunice V1 (Slovakia), unit 1 (1998) and unit 2 (2000), Novovoronezh (Russia), unit 4 (1999) and Kola (Russia), unit 1 and unit 2 (1999) show very good operational results. (Authors)

  1. Eco information 5. Influence of operation of the plants Jadrova vyradovacia spolocnost, a.s., on the environment, locality of Bohunice, within May 2013

    International Nuclear Information System (INIS)

    In this leaflet the results of monitoring of chemical gaseous and liquid effluents into the Vah River and Dudvah River as well as of radiation monitoring of Bohunice V1 NPP, Interim Spent Fuel Storage (MSVP), Bohunice Radioactive Waste Processing Centre (VK808 - BSC), The Main Production Unit (VK 46A - HVB) and Bitumenation Lines (VK 46B - BL) are presented. The radioactive effluents into atmosphere within January - May 2013 (for NPP V1, MSVP, BSC, HVB and BL, respectively) were: 0.138 MBq (0.000% of AL) for V1, 0.194 MBq (0.065 of AL) for MSVP, 0.192 MBq (0.136% of AL) for BSC, 0.470 MBq (0.071% of AL) for HVB and 0.168 MBq (0.119% of AL) for BL of aero-soles. The radioactive effluents into atmosphere and hydrosphere within a May 2013 for NPP V1, MSVP, and VK 808 BSC, respectively, were: 0.024 MBq (V1), 0.055 MBq (VK MSVP), 0.070 MBq (VK 808 BSC), 0.074 MBq (VK 46A) and 0.011 MBq (VK 46B) of aero-soles into atmosphere; 1.249 MBq (V1 and MSVP) and 6.744 MBq (TSU RAO and NPP A1) of corrosive and fission products, and 5.723 GBq (V1 and MSVP) and 5.744 GBq (TSU RAO and NPP A1) of tritium into the Vah River and 0.000 GBq (V1 and MSVP) and 0.000 MBq (TSU RAO and NPP A1) of corrosive and fission products and 0.000 GBq of tritium (V1) and 0.000 GBq of tritium (TSU RAO and NPP A1) into the Dudvah River). For the period January - May 2013 these radioactive effluents into recipient of Vah River represent for corrosive and fission products 5.653 MBq (0.043% of AL for V1 and MSVP) and 34.953 MBq (0.291% of AL for TSU RAO and MSVP); and for tritium it is 8.397 GBq (0.420% of AL) for V1 and MSVP, and 31.661 GBq (0.317% of AL) for TSU RAO and NPP A1 (into the Vah River) and for corrosive and fission products 0.000 MBq (V1 and MSVP) and 0.000 MBq (TSU RAO and NPP A1) (0.000% of AL) and 0.000 GBq (0.000% of AL) for V1 and MSVP and 0.000 GBq (0.000% of AL) (TSU RAO and NPP A1) of tritium (into the Dudvah River). Chemical effluents are reported, too.

  2. IPG Job Manager v2.0 Design Documentation

    Science.gov (United States)

    Hu, Chaumin

    2003-01-01

    This viewgraph presentation provides a high-level design of the IPG Job Manager, and satisfies its Master Requirement Specification v2.0 Revision 1.0, 01/29/2003. The presentation includes a Software Architecture/Functional Overview with the following: Job Model; Job Manager Client/Server Architecture; Job Manager Client (Job Manager Client Class Diagram and Job Manager Client Activity Diagram); Job Manager Server (Job Manager Client Class Diagram and Job Manager Client Activity Diagram); Development Environment; Project Plan; Requirement Traceability.

  3. Core-logs of the vertical borehole V2

    International Nuclear Information System (INIS)

    In the hydrogeological programme of the Stripa Project, borehole V2 was prolonged to a final depth of 822 m. The previous core from 0-471.4 m was relogged. The drill core was logged with regard to rock characteristics, fracture frequency, dipping and filling. The results are presented as core-logs and fracture diagrams. Borehole V2 shows similar characteristics as found in other drillings in the Stripa Mine. It penetrates Stripa granite to its full depth. recorded fractures shows a clear predominance of medium-steep fractures, while flat-lying fractures are more sparsly occuring, a fact which is even more pronounced below 400 m depth. Due to the vertical direction of the borehole, steeply dipping fractures are underestimated in the core. The mean fracture frequency, related to the total length of the core, is 2.1 fractures/m. Chlorite, calcite and epidote are the dominating coating minerals in the fractures, each making up about 25-30 percent of all coated fractures. (Authors)

  4. Locating PHEV Exchange Stations in V2G

    CERN Document Server

    Pan, Feng; Berscheid, Alan; Izraelevitz, David

    2010-01-01

    Plug-in hybrid electric vehicles (PHEVs) are an environmentally friendly technology that is expected to rapidly penetrate the transportation system. Renewable energy sources such as wind and solar have received considerable attention as clean power options for future generation expansion. However, these sources are intermittent and increase the uncertainty in the ability to generate power. The deployment of PHEVs in a vehicle-to-grid (V2G) system provide a potential mechanism for reducing the variability of renewable energy sources. For example, PHEV supporting infrastructures like battery exchange stations that provide battery service to PHEV customers could be used as storage devices to stabilize the grid when renewable energy production is fluctuating. In this paper, we study how to best site these stations in terms of how they can support both the transportation system and the power grid. To model this problem we develop a two-stage stochastic program to optimally locate the stations prior to the realizat...

  5. ARES v2 - new features and improved performance

    CERN Document Server

    Sousa, S G; Adibekyan, V; Delgado-Mena, E; Israelian, G

    2015-01-01

    Aims: We present a new upgraded version of ARES. The new version includes a series of interesting new features such as automatic radial velocity correction, a fully automatic continuum determination, and an estimation of the errors for the equivalent widths. Methods: The automatic correction of the radial velocity is achieved with a simple cross-correlation function, and the automatic continuum determination, as well as the estimation of the errors, relies on a new approach to evaluating the spectral noise at the continuum level. Results: ARES v2 is totally compatible with its predecessor. We show that the fully automatic continuum determination is consistent with the previous methods applied for this task. It also presents a significant improvement on its performance thanks to the implementation of a parallel computation using the OpenMP library.

  6. Ground State Property of LiV2O4

    Institute of Scientific and Technical Information of China (English)

    XU Ying; ZENG Zhi

    2007-01-01

    @@ The spinel structure LiV2O4 is studied by local density approximation (LDA) as well as including strong correlation correction potential, i.e. the LDA+U scheme, which concerns the strongly correlated interaction. With LDA, the orbitals of V 3d and O 2p are well separated so that it presents purely metallic heavy fermion behaviour.The total energy of ferromagnetic phase is slightly lower than that of paramagnetic phase within the LDA approach. This implies that the ferromagnetic instability as a consequence of spin frustrated magnetism can be observed in experiments. The strong correlation interaction by using LDA+U enhances the exchange splitting.The heavy-fermion feature can be derived from the sharp peak around the Fermi level from the density of states.

  7. Synthesis of CuV2O6 as a cathode material for rechargeable lithium batteries from V2O5 gel

    International Nuclear Information System (INIS)

    CuV2O6 is a very promising cathode material for rechargeable lithium batteries. By a soft chemistry method, CuV2O6 is successfully synthesized from V2O5 hydrogel and Cu2O powder. CuV2O6 with different degrees of crystallinity are obtained by heating CuV2O6 precursor at various temperatures. XRD, TG-DTA, TEM and SEM experiments are conducted to characterize its physical properties, and the electrochemical properties have been investigated by galvanostatic charge-discharge experiments. As a result, CuV2O6 annealed at 550 deg. C has smaller crystal lattice constants and better electrochemical properties compared to the sample synthesized by the conventional solid-state method

  8. Congestion Based Mechanism for Route Discovery in a V2I-V2V System Applying Smart Devices and IoT

    OpenAIRE

    Natalia Parrado; Yezid Donoso

    2015-01-01

    The Internet of Things is a new paradigm in which objects in a specific context can be integrated into traditional communication networks to actively participate in solving a determined problem. The Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) technologies are specific cases of IoT and key enablers for Intelligent Transportation Systems (ITS). V2V and V2I have been widely used to solve different problems associated with transportation in cities, in which the most important is ...

  9. GDF v2.0, an enhanced version of GDF

    Science.gov (United States)

    Tsoulos, Ioannis G.; Gavrilis, Dimitris; Dermatas, Evangelos

    2007-12-01

    An improved version of the function estimation program GDF is presented. The main enhancements of the new version include: multi-output function estimation, capability of defining custom functions in the grammar and selection of the error function. The new version has been evaluated on a series of classification and regression datasets, that are widely used for the evaluation of such methods. It is compared to two known neural networks and outperforms them in 5 (out of 10) datasets. Program summaryTitle of program: GDF v2.0 Catalogue identifier: ADXC_v2_0 Program summary URL:http://cpc.cs.qub.ac.uk/summaries/ADXC_v2_0.html Program obtainable from: CPC Program Library, Queen's University, Belfast, N. Ireland Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html No. of lines in distributed program, including test data, etc.: 98 147 No. of bytes in distributed program, including test data, etc.: 2 040 684 Distribution format: tar.gz Programming language: GNU C++ Computer: The program is designed to be portable in all systems running the GNU C++ compiler Operating system: Linux, Solaris, FreeBSD RAM: 200000 bytes Classification: 4.9 Does the new version supersede the previous version?: Yes Nature of problem: The technique of function estimation tries to discover from a series of input data a functional form that best describes them. This can be performed with the use of parametric models, whose parameters can adapt according to the input data. Solution method: Functional forms are being created by genetic programming which are approximations for the symbolic regression problem. Reasons for new version: The GDF package was extended in order to be more flexible and user customizable than the old package. The user can extend the package by defining his own error functions and he can extend the grammar of the package by adding new functions to the function repertoire. Also, the new version can perform function estimation of multi

  10. SPHY v2.0: Spatial Processes in HYdrology

    Science.gov (United States)

    Terink, W.; Lutz, A. F.; Simons, G. W. H.; Immerzeel, W. W.; Droogers, P.

    2015-07-01

    This paper introduces and presents the Spatial Processes in HYdrology (SPHY) model (v2.0), its development background, its underlying concepts, and some example applications. SPHY has been developed with the explicit aim of simulating terrestrial hydrology on flexible scales, under various physiographical and hydroclimatic conditions, by integrating key components from existing and well-tested models. SPHY is a spatially distributed leaky bucket type of model, and is applied on a cell-by-cell basis. The model is written in the Python programming language using the PCRaster dynamic modeling framework. SPHY (i) integrates most hydrologic processes, (ii) has the flexibility to be applied in a wide range of hydrologic applications, and (iii) on various scales, and (iv) can easily be implemented. The most relevant hydrological processes that are integrated into the SPHY model are rainfall-runoff processes, cryosphere processes, evapotranspiration processes, the dynamic evolution of vegetation cover, lake/reservoir outflow, and the simulation of root-zone moisture contents. Studies in which the SPHY model was successfully applied and tested are described in this paper, including (i) real-time soil moisture predictions to support irrigation management in lowland areas, (ii) climate change impact studies in snow- and glacier-fed river basins, and (iii) operational flow forecasting in mountainous catchments.

  11. LANL*V2.0: global modeling and validation

    Directory of Open Access Journals (Sweden)

    S. Zaharia

    2011-08-01

    Full Text Available We describe in this paper the new version of LANL*, an artificial neural network (ANN for calculating the magnetic drift invariant L*. This quantity is used for modeling radiation belt dynamics and for space weather applications. We have implemented the following enhancements in the new version: (1 we have removed the limitation to geosynchronous orbit and the model can now be used for a much larger region. (2 The new version is based on the improved magnetic field model by Tsyganenko and Sitnov (2005 (TS05 instead of the older model by Tsyganenko et al. (2003. We have validated the model and compared our results to L* calculations with the TS05 model based on ephemerides for CRRES, Polar, GPS, a LANL geosynchronous satellite, and a virtual RBSP type orbit. We find that the neural network performs very well for all these orbits with an error typically ΔL* * V2.0 artificial neural network is orders of magnitudes faster than traditional numerical field line integration techniques with the TS05 model. It has applications to real-time radiation belt forecasting, analysis of data sets involving decades of satellite of observations, and other problems in space weather.

  12. SPHY v2.0: Spatial Processes in HYdrology

    Directory of Open Access Journals (Sweden)

    W. Terink

    2015-02-01

    Full Text Available This paper introduces and presents the Spatial Processes in HYdrology (SPHY model (v2.0, its development background, its underlying concepts, and some typical applications. The SPHY model is developed using the best components of existing and well-tested simulation models, and is developed with the explicit aim to simulate terrestrial hydrology at flexible scales, under various land use and climate conditions. SPHY is a spatially distributed leaky bucket type of model, and is applied on a cell-by-cell basis. The model is written in the Python programming language using the PCRaster dynamic modelling framework. Compared to other hydrological models, that typically focus on the simulation of streamflow only, the SPHY model has several advantages: it (i integrates most relevant hydrological processes, (ii is setup modular, (iii is easy adjustable and applicable, (iii can easily be linked to remote sensing data, and (iv can be applied for operational as well as strategic decision support. The most relevant hydrological processes that are integrated in the SPHY model are rainfall–runoff processes, cryosphere processes, evapotranspiration processes, the simulation of dynamic vegetational cover, lake/reservoir outflow, and the simulation of rootzone moisture contents. Studies in which the SPHY model was successfully applied and tested are described in this paper, and range from (i real-time soil moisture predictions to support irrigation management in lowland areas, to (ii detailed climate change impact studies in snow and glacier-fed river basins, to (iii operational flow forecasting in mountainous catchments.

  13. A review of the Protocol Reporter v.2.0

    International Nuclear Information System (INIS)

    The Agreement between the Republic of Korea (ROK) and the IAEA for the Application of Safeguards in Connection with the Treaty on the Non-Proliferation of Nuclear Weapons (the Safeguards Agreement) entered into force on November 14th, 1975. The Additional Protocol to the Safeguards Agreement (the Additional Protocol) was signed on June 21st, 1999 and entered into force on February 19th, 2004. ROK has been submitting annual updated reports of initial declaration on every May 15th since August 2004. Additional protocol reports have been submitted through Protocol Reporter provided by IAEA. Protocol Reporter is a computer system that facilitates preparation of reports by Member States of Declarations pursuant to Article 2 and 3 of the Protocol Additional to Safeguards Agreements (Additional Protocol). Protocol Reporter version 1.0 was developed by the IAEA in 1999 to help Member States structure electronic data storage and reporting formats in a way which is compatible with the guidelines on the Additional Protocol and its data handling system. However, Protocol Reporter version 1.0 had several limitations in data management and Member states requested upgraded software. In order to meet the demand, IAEA developed and released Protocol Reporter version 2.0 in 2008. Member states, consequently, should declare and submit the additional reports through the new version of the protocol reporter. This paper aimed to provide a brief overview of Protocol Reporter v.2.0 and highlight the improvements over the previous version

  14. 26 CFR 31.3121(v)(2)-2 - Effective dates and transition rules.

    Science.gov (United States)

    2010-04-01

    ... 26 Internal Revenue 15 2010-04-01 2010-04-01 false Effective dates and transition rules. 31.3121(v)(2)-2 Section 31.3121(v)(2)-2 Internal Revenue INTERNAL REVENUE SERVICE, DEPARTMENT OF THE TREASURY... Provisions § 31.3121(v)(2)-2 Effective dates and transition rules. (a) General statutory effective...

  15. Skills enhancement in the nuclear power sector: education upgrading, training, and the Nuclear Power Plant Personnel Training Centre

    International Nuclear Information System (INIS)

    The article gives an overview of how the needs of the Slovak power sector and nuclear industry with respect to personnel skills and training are addressed and satisfied. The needs are driven by the recent significant legislative changes, continuing modernization of the Bohunice V-2 units, preparation of the Bohunice V-1 units for shutdown, and completion of the Mochovce 3 and 4 units, in connection with the licence holder's recruitment and training of qualified and competent staff. The forms, methods and means used within the theoretical and practical training, including the use of a reactor simulator, are highlighted. (author)

  16. Coordination of vanadium in the phases 4PbO . V2O5 and 8PbO . V2O5

    International Nuclear Information System (INIS)

    It is demonstrated, using infrared spectroscopy, that the coordination of vanadium in the two binary phases 4 PbO . V2O5 and 8 PbO . V2O5 is tetrahedral. The spectra in the V-O stretching region closely resembles that of the lead(II) orthovanadate, Pb3(VO4)2. (author)

  17. A feasibility Study: The Succinct Solver v2.0, XSB Prolog v2.6, and Flow-Logic Based Program Analysis for Carmel

    DEFF Research Database (Denmark)

    Pilegaard, Henrik

    2003-01-01

    We perform a direct comparison of the {Succinct Solver v2.0} and {XSB Prolog v2.6} based on experiments with {Control Flow Analyses} of scalable {Discretionary Ambient programs} and {Carmel programs}. To facilitate this comparison we expand ALFP clauses accepted by the Succinct Solver into more...

  18. Deactivation of V2O5-WO3-TiO2 SCR catalyst at a biomass-fired combined heat and power plant

    DEFF Research Database (Denmark)

    Zheng, Yuanjing; Jensen, Anker; Johnsson, Jan Erik

    2005-01-01

    The deactivation of a commercial type V2O5-WO3-TiO2 monolith catalyst under biomass combustion was studied at a full-scale grate-fired power plant burning straw/wood using a slip stream pilot scale reactor. The aerosols in the flue gas consisted of a mixture of potassium chloride and sulphate. Th...... though reactivation is possible, the deactivation rate appears too high for practical use of the SCR process in straw combustion....

  19. THE NANOCOMPOSITE FILM OF POLYMER INTERCALATION IN V2O5 XEROGEL

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    The nanocomposite films were prepared by poly(ethylene oxide), PEO, intercalation in V2O5 xerogel in sol-gel. The synthesis and state of the films are investigated by the XRD, IR, SEM, etc. The results show that V2O5 xerogel is a layered structure which arranges in c-direction. The interlayer distance of V2O5 xerogel increases remarkably when PEO is intercalated in V2O5 xerogel interlayer. PEO has strong interaction with V2O5 host. The surface of the films is homogeneous without holes and cracks.

  20. V2O5/Mesoporous Carbon Composite as a Cathode Material for Lithium-ion Batteries

    International Nuclear Information System (INIS)

    ABSTRACT: V2O5/mesoporous carbon composite has been prepared by an ultrasonically assisted method followed by a sintering process. The as-prepared V2O5/mesoporous carbon material containing 90 wt% V2O5 shows better electrochemical performance, with capacity of 163 mA h g−1 after 100 cycles at the current density of 500 mA g−1, as well as better charge/discharge rate capability for lithium storage than V2O5 nanoparticles. The improved electrochemical performance indicates that the V2O5/mesoporous carbon composite could be used as a promising cathode material for lithium ion batteries

  1. Fission rate distributions on assemblies V-3, V-3B and V-2-R

    International Nuclear Information System (INIS)

    The fission rate distributions were measured on a series of Assemblies FCA V-3, V-3B1, V-3B3, V-3B4, V-3B5 and V-2R. They are the systems for engineering mock-up of Fast Experimental Reactor ''JOYO''. Composition of core material is common for any of Assemblies. However, different material is used with the Assemblies such as natural uranium metal, mixture of uranium oxide and moderators, and stainless steel for their blanket. One-dimensional diffusion calculations by EXPANDA-4 and two-dimensional diffusion calculations by EXTERMINATOR-2 have been performed using JAERI-FAST Version II. The ratio of calculational result to the experimental one (C/E) is very close to the unity in the core region. It is less than 1.0 systematically in the blanket region. This disagreement can be improved by taking the streaming effect of experimental hole, and by appropriate treatment of the empty lattice region outside of the blanket. (author)

  2. DeNOx Study in Diesel Engine Exhaust Using Barrier Discharge Corona Assisted by V2O5/TiO2 Catalyst

    Institute of Scientific and Technical Information of China (English)

    B. S. Rajanikanth; V. Ravi

    2004-01-01

    A plasma-assisted catalytic reactor was used to remove nitrogen oxides (Nox) from diesel engine exhaust operated under different load conditions. Initial studies were focused on plasma reactor (a dielectric barrier discharge reactor) treatment of diesel exhaust at various temperatures. The nitric oxide (NO) removal efficiency was lowered when high temperature exhaust was treated using plasma reactor. Also, NO removal efficiency decreased when 45% load exhaust was treated. Studies were then made with plasma reactor combined with a catalytic reactor consisting of a selective catalytic reduction (SCR) catalyst, V2O5/TiO2. Ammonia was used as a reducing agent for SCR process in a ratio of 1:1 to Nox. The studies were focused on temperatures of the SCR catalytic reactor below 200 ℃. The plasma-assisted catalytic reactor was operated well to remove Nox under no-load and load conditions. For an energy input of 96 J/l, the Nox removal efficiencies obtained under no-load and load conditions were 90% and 72% respectively at an exhaust temperature of 100 ℃.

  3. DeNOx study in diesel engine exhaust using barrier discharge corona assisted by V2O5/TiO2 catalyst

    International Nuclear Information System (INIS)

    A plasma-assisted catalytic reactor was used to remove nitrogen oxides (NOx) from diesel engine exhaust operated under different load conditions. Initial studies were focused on plasma reactor (a dielectric barrier discharge reactor) treatment of diesel exhaust at various temperatures. The nitric oxide (NO) removal efficiency was lowered when high temperature exhaust was treated using plasma reactor. Also, NO removal efficiency decreased when 45% load exhaust was treated. Studies were then made with plasma reactor combined with a catalytic reactor consisting of a selective catalytic reduction (SCR) catalyst, V2O5/TiO2. Ammonia was used as a reducing agent for SCR process in a ratio of 1:1 to NOx. The studies were focused on temperatures of the SCR catalytic reactor below 200 degree C. The plasma-assisted catalytic reactor was operated well to remove NOx under no-load and load conditions. For an energy input of 96 J/1, the NOx removal efficiencies obtained under no-load and load conditions were 90% and 72% respectively at an exhaust temperature of 100 degree C. (authors)

  4. Synthesis and Characterization of Self-Assembled V2O5 Mesostructures Intercalated by Polyaniline

    Institute of Scientific and Technical Information of China (English)

    Li Li; Zifeng Yan

    2005-01-01

    A new nanocomposite of vanadium pentoxide (V2O5) and polyaniline (PANI) were synthesized by in situ oxidative polymerization/intercalation on V2O5 powder at room temperature. The reaction was facile and topotactic, forming polyaniline as the emeraldine salt. It was indicated that V2O5 itself can catalyze the oxidative polymerization of aniline and that layered structure could make aniline intercalate into the V2O5 framework. It makes the in situ polymerization feasible to occur in the layer of V2O5 structure. XRD results showed PANI/V2O5 nanocomposite possessed lamellar mesostructure, which was determined by an X-ray diffraction peak at 6.5° and SEM photograph. And FT-IR spectrum suggested that there was interaction between PANI and V2O5. The hybrid had better thermal stability in N2 and air ambience.

  5. TERS v2.0: An improved version of TERS

    Science.gov (United States)

    Nath, S.

    2009-11-01

    We present a new version of the semimicroscopic Monte Carlo code "TERS". The procedure for calculating multiple small angle Coulomb scattering of the residues in the target has been modified. Target-backing and residue charge-reset foils, which are often used in heavy ion-induced complete fusion reactions, are included in the code. New version program summaryProgram title: TERS v2.0 Catalogue identifier: AEBD_v2_0 Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AEBD_v2_0.html Program obtainable from: CPC Program Library, Queen's University, Belfast, N. Ireland Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html No. of lines in distributed program, including test data, etc.: 7309 No. of bytes in distributed program, including test data, etc.: 1 219 555 Distribution format: tar.gz Programming language: C Computer: The code has been developed and tested on a PC with Intel Pentium IV processor. Operating system: Linux RAM: About 8 Mbytes Classification: 17.7 External routines: pgplot graphics subroutine library [1] should be installed in the system for generating residue trajectory plots. (The library is included in the CPC distribution file.) Catalogue identifier of previous version: AEBD_v1_0 Journal reference of previous version: Comput. Phys. Comm. 179 (2008) 492 Does the new version supersede the previous version?: Yes Nature of problem: Recoil separators are employed to select and identify nuclei of interest, produced in a nuclear reaction, rejecting unreacted beam and other undesired reaction products. It is important to know what fraction of the selected nuclei, leaving the target, reach the detection system. This information is crucial for determining absolute cross section of the studied reaction. Solution method: Interaction of projectiles with target nuclei is treated event by event, semimicro-scopically. Position and angle (with respect to beam direction), energy and charge state of the reaction products are

  6. Improved stability of electrochromic devices using Ti-doped V2O5 film

    International Nuclear Information System (INIS)

    Graphical abstract: Display Omitted - Highlights: • Ti-doped V2O5 films were created by spin coating a solution on glass. • Adding Ti distorted V2O5 layers structure, proving more free space for Li+ movement. • Doped V2O5 demonstrated better stability and higher transmittance than pure V2O5. • Electrochromic device with optimized doped film exhibited excellent cyclic stability. • Electrochromic device with doped film demonstrated a good memory effect. - Abstract: Vanadium pentoxide (V2O5) is a promising material for constructing electrochromic devices, due to its outstanding properties of lithium ion intercalation/deintercalation. However, its poor cyclic stability limits practical applications. We report here that V2O5 films gain significantly improved cyclic stability by doping with titanium (Ti) and perform well in WO3-based electrochromic devices. V2O5 films were fabricated by spin coating with a vanadium triisopropoxy oxide solution followed by heat treatment. X-ray diffraction studies reveal that introducing the Ti element reduces the crystallinity of a V2O5 film and distorts its layer structure. The cyclic stability of the V2O5 films increases as the doped Ti content increases. The electrochromic device assembled with an optimized V2O5 electrode (V:Ti = 2:1) has lasted 200,000 cyclic switching times between the lowest (2%) and highest (62%) transmittance with no significant degradation of performance

  7. Magnetic phase diagrams of the Kagome staircase compounds Co3V2O8 and Ni3V2O8

    International Nuclear Information System (INIS)

    An extensive low temperature magnetization study of high quality single crystals of the Kagome staircase compounds Ni3V2O8 and Co3V2O8 has been performed, and the H-T phase diagrams have been determined from these measurements. The magnetization and susceptibility curves for Co3V2O8 are analysed in terms of their compatibility with the different ferromagnetic and antiferromagnetic structures proposed for this compound. For Ni3V2O8, the phase diagram is extended to magnetic fields higher than previously reported; for a field applied along the a axis, the low temperature incommensurate phase is found to close at around 90 kOe

  8. Structural characterization of the β-Cu2V2O7-α-Zn2V2O7 solid solution

    International Nuclear Information System (INIS)

    (Zn2-xCux)V2O7 solid-solutions were synthesized by heating to 1000 C, cooling to 750 C, and then quenching. Powder-diffraction patterns and the single-crystal structure refinements of (Cu0.56Zn1.44)V2O7, (Cu1.0Zn1.0V2O7, and (Cu1.53Zn0.47)V2)7 show that the solid-solution series between α-Zn2V2O7 and β-Cu2V2O7 is complete and that there is no phase transition. With substitution of Zn by Cu2+, a and b lattice constants increase and decrease, respectively, while c lattice constant and cell volume (V) do not change. This results from elongation of the (MO5) square pyramid (M = Zn, Cu2+) and from rotation of the vanadate tetrahedra. In order to form the elongated square-pyramid that must accompany increasing substitution of Zn by Cu2+, the apical M-O bond length increases and decreases its incident bond valence at M2+. The resulting bond-valence deficit is compensated by shortening of the equatorial M-O bond lengths. The response of the α-Zn2V2O7/β-Cu2V2O7 framework to the strain produced by elongation of the square pyramid involves coupled clockwise and counter clockwise rotations of the (VO4) tetrahedra, accounting for the constant cell volumes and increase and decrease of the a and b lattice constants, respectively. This cooperative response is possible because there are no symmetry restrictions on the rotation of the (VO4) tetrahedra

  9. Congestion based mechanism for route discovery in a V2I-V2V system applying smart devices and IoT.

    Science.gov (United States)

    Parrado, Natalia; Donoso, Yezid

    2015-01-01

    The Internet of Things is a new paradigm in which objects in a specific context can be integrated into traditional communication networks to actively participate in solving a determined problem. The Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) technologies are specific cases of IoT and key enablers for Intelligent Transportation Systems (ITS). V2V and V2I have been widely used to solve different problems associated with transportation in cities, in which the most important is traffic congestion. A high percentage of congestion is usually presented by the inappropriate use of resources in vehicular infrastructure. In addition, the integration of traffic congestion in decision making for vehicular traffic is a challenge due to its high dynamic behavior. In this paper, an optimization model over the load balancing in the congestion percentage of the streets is formulated. Later, we explore a fully congestion-oriented route discovery mechanism and we make a proposal on the communication infrastructure that should support it based on V2I and V2V communication. The mechanism is also compared with a modified Dijkstra's approach that reacts at congestion states. Finally, we compare the results of the efficiency of the vehicle's trip with the efficiency in the use of the capacity of the vehicular network. PMID:25835185

  10. Congestion Based Mechanism for Route Discovery in a V2I-V2V System Applying Smart Devices and IoT

    Directory of Open Access Journals (Sweden)

    Natalia Parrado

    2015-03-01

    Full Text Available The Internet of Things is a new paradigm in which objects in a specific context can be integrated into traditional communication networks to actively participate in solving a determined problem. The Vehicle-to-Vehicle (V2V and Vehicle-to-Infrastructure (V2I technologies are specific cases of IoT and key enablers for Intelligent Transportation Systems (ITS. V2V and V2I have been widely used to solve different problems associated with transportation in cities, in which the most important is traffic congestion. A high percentage of congestion is usually presented by the inappropriate use of resources in vehicular infrastructure. In addition, the integration of traffic congestion in decision making for vehicular traffic is a challenge due to its high dynamic behavior. In this paper, an optimization model over the load balancing in the congestion percentage of the streets is formulated. Later, we explore a fully congestion-oriented route discovery mechanism and we make a proposal on the communication infrastructure that should support it based on V2I and V2V communication. The mechanism is also compared with a modified Dijkstra’s approach that reacts at congestion states. Finally, we compare the results of the efficiency of the vehicle’s trip with the efficiency in the use of the capacity of the vehicular network.

  11. Photochromism in V2O5 thin layers produced according to 'sol-gel' technology

    International Nuclear Information System (INIS)

    For the first time is reported on the photochromic properties of V2O5 amorphous layers produced according to the 'sol-gel' technology. Absorption spectra are presented of the V2O5 amorphous layers before and after their irradiation by some doses of the mercury-discharge lamp radiation. The obtained results permit make to the conclusion on the prospects of V2O5 gels as photochromic materials

  12. Novel insights into the molecular pathogenesis of CYP4V2-associated Bietti's retinal dystrophy

    OpenAIRE

    Astuti, G.D.N; Sun, V.; Bauwens, M; Zobor, D.; Leroy, B.P.; Omar, A.; Jurklies, B; Lopez, I; Ren, H.; Yazar, V.; Hamel, C; Kellner, U.; Wissinger, B.; Kohl, S; Baere, E. de

    2015-01-01

    Bietti's crystalline dystrophy (BCD) is a rare, autosomal recessive retinal degenerative disease associated with mutations in CYP4V2. In this study, we describe the genetic and clinical findings in 19 unrelated BCD patients recruited from five international retinal dystrophy clinics. Patients underwent ophthalmic examinations and were screened for CYP4V2 mutations by Sanger sequencing and quantitative polymerase chain reaction (qPCR) copy number variation screening. Eight CYP4V2 mutations wer...

  13. TYLCV-Is movement in planta does not require V2 protein

    Energy Technology Data Exchange (ETDEWEB)

    Hak, Hagit [Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan (Israel); Department of Biological Chemistry, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem (Israel); Levy, Yael; Chandran, Sam A.; Belausov, Eduard [Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan (Israel); Loyter, Abraham [Department of Biological Chemistry, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem (Israel); Lapidot, Moshe [Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan (Israel); Gafni, Yedidya, E-mail: ygafni@volcani.agri.gov.il [Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan (Israel)

    2015-03-15

    Tomato yellow leaf curl virus (TYLCV), a major tomato pathogen causing extensive crop losses, is a whitefly-transmitted geminivirus. V2 mutants of TYLCV-Is and related viruses tend to induce symptomless infection with attenuated viral DNA levels, while accumulating close to wild-type DNA levels in protoplasts, suggesting V2 as a movement protein. The discovery of plant-silencing mechanisms and viral silencing suppressors, V2 included, led us to reconsider V2's involvement in viral movement. We studied two mutant versions of the virus, one impaired in V2 silencing-suppression activity, and another carrying a non-translatable V2. While both mutant viruses spread in the infected plant to newly emerged leaves at the same rate as the wild-type virus, their DNA-accumulation levels were tenfold lower than in the wild-type virus. Thus, we suggest that the setback in virus proliferation, previously ascribed to a movement impediment, is due to lack of silencing-suppression activity. - Highlights: • TYLCV-Is V2 protein is localized in distinct microbodies throughout the cell cytoplasm, around the nucleus and in association with cytoplasmic strands but is not associated with the plasmodesmata. • Disruption of RNA-silencing suppression activity of TYLCV-Is V2 protein causes low titer of the virus in the infected plants. • The movement of TYLCV-Is in planta does not require a functional V2 protein.

  14. The Representation of Orientation in Macaque V2: Four Stripes Not Three.

    Science.gov (United States)

    Felleman, Daniel J; Lim, Heejin; Xiao, Youping; Wang, Yi; Eriksson, Anastasia; Parajuli, Arun

    2015-09-01

    Area V2 of macaque monkeys is traditionally thought to consist of 3 distinct functional compartments with characteristic cortical connections and functional properties. Orientation selectivity is one property that has frequently been used to distinguish V2 stripes, however, this receptive field property has been found in a high percentage of neurons across V2 compartments. Using quantitative intrinsic cortical imaging, we derived maps of preferred orientation, orientation selectivity, and orientation gradient in thin stripes, thick stripes, and interstripes in area V2. Orientation-selective responses were found in each V2 stripe, but the magnitude and organization of orientation selectivity differed significantly from stripe to stripe. Remarkably, the 2 pale stripes flanking each cytochrome oxidase dense stripe differed significantly in their representation of orientation resulting in their distinction as type-I and type-II interstripes. V2 orientation maps are characterized by clockwise and anticlockwise "orientation pinwheels", but unlike V1, they are not homogeneously distributed across V2. Furthermore, V2 stripes contain large-scale sequences of preferred orientation. These analyses demonstrate that V2 consists of 4 distinct functional compartments; thick stripes and type-II interstripes, which are strongly orientation selective and thin stripes and type-I interstripes, which are significantly less selective for orientation and exhibit larger orientation gradient magnitudes. PMID:24614951

  15. TYLCV-Is movement in planta does not require V2 protein

    International Nuclear Information System (INIS)

    Tomato yellow leaf curl virus (TYLCV), a major tomato pathogen causing extensive crop losses, is a whitefly-transmitted geminivirus. V2 mutants of TYLCV-Is and related viruses tend to induce symptomless infection with attenuated viral DNA levels, while accumulating close to wild-type DNA levels in protoplasts, suggesting V2 as a movement protein. The discovery of plant-silencing mechanisms and viral silencing suppressors, V2 included, led us to reconsider V2's involvement in viral movement. We studied two mutant versions of the virus, one impaired in V2 silencing-suppression activity, and another carrying a non-translatable V2. While both mutant viruses spread in the infected plant to newly emerged leaves at the same rate as the wild-type virus, their DNA-accumulation levels were tenfold lower than in the wild-type virus. Thus, we suggest that the setback in virus proliferation, previously ascribed to a movement impediment, is due to lack of silencing-suppression activity. - Highlights: • TYLCV-Is V2 protein is localized in distinct microbodies throughout the cell cytoplasm, around the nucleus and in association with cytoplasmic strands but is not associated with the plasmodesmata. • Disruption of RNA-silencing suppression activity of TYLCV-Is V2 protein causes low titer of the virus in the infected plants. • The movement of TYLCV-Is in planta does not require a functional V2 protein

  16. N Reactor

    Data.gov (United States)

    Federal Laboratory Consortium — The last of Hanfordqaodmasdkwaspemas7ajkqlsmdqpakldnzsdflss nine plutonium production reactors to be built was the N Reactor.This reactor was called a dual purpose...

  17. Zebrafish CaV2.1 Calcium Channels Are Tailored for Fast Synchronous Neuromuscular Transmission

    Science.gov (United States)

    Naranjo, David; Wen, Hua; Brehm, Paul

    2015-01-01

    The CaV2.2 (N-type) and CaV2.1 (P/Q-type) voltage-dependent calcium channels are prevalent throughout the nervous system where they mediate synaptic transmission, but the basis for the selective presence at individual synapses still remains an open question. The CaV2.1 channels have been proposed to respond more effectively to brief action potentials (APs), an idea supported by computational modeling. However, the side-by-side comparison of CaV2.1 and CaV2.2 kinetics in intact neurons failed to reveal differences. As an alternative means for direct functional comparison we expressed zebrafish CaV2.1 and CaV2.2 α-subunits, along with their accessory subunits, in HEK293 cells. HEK cells lack calcium currents, thereby circumventing the need for pharmacological inhibition of mixed calcium channel isoforms present in neurons. HEK cells also have a simplified morphology compared to neurons, which improves voltage control. Our measurements revealed faster kinetics and shallower voltage-dependence of activation and deactivation for CaV2.1. Additionally, recordings of calcium current in response to a command waveform based on the motorneuron AP show, directly, more effective activation of CaV2.1. Analysis of calcium currents associated with the AP waveform indicate an approximately fourfold greater open probability (PO) for CaV2.1. The efficient activation of CaV2.1 channels during APs may contribute to the highly reliable transmission at zebrafish neuromuscular junctions. PMID:25650925

  18. Zebrafish CaV2.1 calcium channels are tailored for fast synchronous neuromuscular transmission.

    Science.gov (United States)

    Naranjo, David; Wen, Hua; Brehm, Paul

    2015-02-01

    The CaV2.2 (N-type) and CaV2.1 (P/Q-type) voltage-dependent calcium channels are prevalent throughout the nervous system where they mediate synaptic transmission, but the basis for the selective presence at individual synapses still remains an open question. The CaV2.1 channels have been proposed to respond more effectively to brief action potentials (APs), an idea supported by computational modeling. However, the side-by-side comparison of CaV2.1 and CaV2.2 kinetics in intact neurons failed to reveal differences. As an alternative means for direct functional comparison we expressed zebrafish CaV2.1 and CaV2.2 α-subunits, along with their accessory subunits, in HEK293 cells. HEK cells lack calcium currents, thereby circumventing the need for pharmacological inhibition of mixed calcium channel isoforms present in neurons. HEK cells also have a simplified morphology compared to neurons, which improves voltage control. Our measurements revealed faster kinetics and shallower voltage-dependence of activation and deactivation for CaV2.1. Additionally, recordings of calcium current in response to a command waveform based on the motorneuron AP show, directly, more effective activation of CaV2.1. Analysis of calcium currents associated with the AP waveform indicate an approximately fourfold greater open probability (PO) for CaV2.1. The efficient activation of CaV2.1 channels during APs may contribute to the highly reliable transmission at zebrafish neuromuscular junctions. PMID:25650925

  19. Proceedings of international conference on peaceful uses of atomic energy - 2009. V. 2

    International Nuclear Information System (INIS)

    The proceedings contains 330 contributed papers from scientists, technologists and policy makers from India and abroad. These papers are categorized into nine themes: Resources, Reactor Systems, Advance Reactors, Fuel Cycle, Reactor Materials, Fast Reactors and Accelerator Driven Subcritical Systems, Food and Agriculture, Radiotherapy and Medicine, and Nuclear Instrumentation.This volume covers papers on the topics like reactor materials, fast reactor and ADSS (FRA), food and agriculture, radiotherapy and medicine and nuclear instrumentation. Papers relevant to INIS are indexed separately

  20. 反相微乳法制备纳米V2O5%Preparation of V2O5 Nanoparticles by Reverse Microemulsion Method

    Institute of Scientific and Technical Information of China (English)

    唐雪萍; 强敏; 罗卫; 王欣; 王玉珏; 邹瑜

    2012-01-01

    采用十六烷基三甲基溴化铵(CTAB)/正丁醇/正辛烷/水溶液微乳体系成功制备了纳米V2O5.先采用反相微乳法分别制备碱性偏钒酸铵微乳液和稀硫酸单相微乳液,再将两种微乳液混合得到V2O5前驱物,经陈化、洗涤、干燥、焙烧得到纳米V2O5.通过测定电导率分析了微乳体系的稳定性,采用FTIR、XRD、TEM对纳米V2O5的结构、成分、晶形、粒径等进行了表征.结果表明,采用反相微乳法制备的纳米V2O5为球形、分散性较好、颗粒粒径为6~20nm.%V2O5 Nanoparticles was successfully prepared by reverse microemulsion composed of cetyltrime-thylammonium bromide (CTAB)/1-butanol/l-octane/water. Ammonium metavanadate alkaline microemulsion and sulfuric acid configurable single phase microemulsion were prepared through reverse microemulsion method,and then two sets of microemulsion was mixed. After precursors synthesized in a W/O reverse microemulsion were washed,dryed and calcined, the V2O5 nanoparticles were obtained. The stability of microemulsion was investigated by measuring the conductivity,and the structure,composition,crystal form,morphologies and size of the V2O5 nanoparticles were characterized by FTIR,XRD,TEM. V2O5 Nanoparticles with spherical grains, good monodispersity and 6~20 nm of size was obtained by reverse microemulsion method.

  1. Structural and electrochemical properties of V2O5 and AgxV2O5 nanowries prepared by template assisted method

    Science.gov (United States)

    Sahana, M. B.; Sudakar, C.; Naik, R.; Naik, V. M.

    2009-03-01

    Vanadium pentaoxide and silver vanadium oxides are promising cathode materials for lithium ion battery as it allows easy intercalation/deintercalation of Li+ due its open layered structure. During Li+ intercalation energy is stored as chemical potential and during deintercalation the energy is released as electricity. Because of the large surface area nanostructured materials have enhanced energy storage capacity. We have prepared V2O5 and AgxV2O5 (x= 0.1, 0.5) nanowires by template assisted method using radiation track etched hydrophilic PC membrane. The nanowires were grown on ITO coated glass substrates for optical analysis and on stainless steel substrate for XRD, SEM, Raman and electrochemical measurements. The effects of Ag doping on the electrochemical properties of V2O5 nanowires were investigated using a three electrode cell with nanowries as working electrode and Li as counter and reference electrode and lithium perchlorate in propylene carbonate as the electrolyte. The electrochemical characteristics of V2O5 and AgxV2O5 nanowries such as lithium intercalation capacity, cyclic stability and diffusion coefficient will be presented.

  2. Mobility Patterns Informing V2X Research Projects: Eco-Routing and Electrified Roadway Project Examples

    Energy Technology Data Exchange (ETDEWEB)

    Gonder, Jeff; Brooker, Aaron; Burton, Evan; Wang, Lijuan; Wood, Eric

    2016-05-19

    Presentation given at an 'Expert Workshop on V2X Enabled Electric Vehicles' hosted at NREL on behalf of the International Energy Agency (IEA) Hybrid and Electric Vehicle Implementing Agreement for Task 28: Home Grids and V2X Technologies.

  3. Determination of burnup balance for nuclear reactor fuel on the basis of γ-spectrometric determination of fission products

    International Nuclear Information System (INIS)

    Results are given of experimental investigations in one of the versions of the method for determination of the balance of nuclear fuel burnup process by means of the γ-spectrometry of fission products. In the version being considered a balance of the burnup process was determined on the base of 106Ru, 134Cs.Activity was measured by means of a γ-spectrometer with Ge counter. Investigations were done on the natural uranium metal fuel from the heavy-water moderated reactor of the first Czechoslovakian nuclear power plant A1 in Yaslovske Bohunice. Possibility was checked of determination of the fuel burnup depth as well as of the isotope ratio and content of plutonium. Results were compared with the control data which had been obtained on the base of the mass-spectrometry of U, Pu and Nd. The reasors for deviations were estimated in the cases when they were greater tan error in the control data

  4. Genomic organization and sequence analysis of the vomeronasal receptor V2R genes in mouse genome

    Institute of Scientific and Technical Information of China (English)

    YANG Hui; Zhang YaPing

    2007-01-01

    Two multigene superfamilies, named V1R and V2R, encoding seven-transmembrane-domain G-protein coupled receptors (GPCRs) have been identified as pheromone receptors in mammals. Three V2R gene families have been described in mouse and rat. Here we screened the updated mouse genome sequence database and finally retrieved 63 putative functional V2R genes including three newly identified genes which formed a new additional family. We described the genomic organization of these genes and also characterized the conservation of mouse V2R protein sequences. These genomic and sequence information we described are useful as part of the evidence to speculate the functional domain of V2Rs and should give aid to the functionality study in the future.

  5. Beam Tracking in Switched-Beam Antenna System for V2V Communication

    Directory of Open Access Journals (Sweden)

    Settawit Poochaya

    2016-01-01

    Full Text Available This paper presents the proposed switched beam antenna system for V2V communication including optimum antenna half power beamwidth determination in urban road environments. SQP optimization method is selected for the computation of optimum antenna half power beamwidth. In addition, beam tracking algorithm is applied to guarantee the best beam selection with maximum RSSI. The results present the success of the proposed system with the increasing of V2V performance metrics. Also, V2V data dissemination via the proposed system introduces the enhancement of V2V link in terms of RSSI, PER, BER, Tsafe, and Rsafe. The results indicate the improvement of V2V link reliability. Consequently, the road safety is improved.

  6. Transporte de carga em compósitos de polianilina/V2O5 Charge transportation in polyaniline/V2O5 composites

    Directory of Open Access Journals (Sweden)

    Fritz Huguenin

    2004-06-01

    Full Text Available In this work, composites formed from a mixture of V2O5 and polyaniline (PANI were investigated, for applications as cathode materials for secondary lithium batteries. Electrochemical quartz crystal microbalance (EQCM data show that charge compensation in the [PANI]0.3V2O5 nanocomposite is achieved predominantly by Li+ migration. However, the charge compensation in the [PANI]V2O5 microcomposite occurs by Li+ and ClO4- transport. Electrochemical Impedance Spectroscopy (EIS measurements reveal several benefits of nanohybrid formation, including the achievement of shorter ionic diffusion pathways, the higher diffusion rate of the lithium ion and also the higher electronic conductivity, which are responsible for a synergetic effect of the energy storage properties.

  7. Monitoring of primary circuit and reactor of NPP A-1

    International Nuclear Information System (INIS)

    Nuclear Power Plant A-1 in Jaslovske Bohunice was commissioned in 1972. Heavy water moderated, carbon dioxide cooled channel type reactor was shut down after two accidents in 1977. During more serious second accident, the reduced coolant flow caused local overheating of the fuel and consequent damage/melting of the fuel channel. Both accidents had led to the damage of several fuel assemblies with extensive local damage of fuel claddings. As a consequence, the main cooling circuit was significantly contaminated by fission products and long-life alpha nuclides. The detailed monitoring of dose rates, smearable contamination and sampling of contamination was performed. Extended monitoring in reacto vessel, primary circuit pipes, turbo-compressors, steam generators, main valves, gas tanks and also heavy water system with collectors, coolers, distilling and purification station, pumps and valves was done. Appropriate devices and procedures for the monitoring and examination of the installations were prepared and applied. Obtained results will serve for the future planning of the decontamination and decommissioning works. The 3-D model of the reactor that had been developed as part of this Project proved invaluable for orientation, visualisation, planning and analysis of results. Dose rates were measured in the technological channels from the reactor hall floor to the bottom of the hot gas chamber in decrements of 1 m and 0.5 m. The highest absolute values of dose rates were found in channels located in the middle of the reactor (up to 1900 mGy/h in the active zone region). It is estimated that the total contaminated area of primary circuit equipment (pipework, steam generators and turbo-compressors) is some 48 000 m2. It follows that the total gamma contamination is of the order of 1014 to 1015 Bq and total alpha contamination 1011 to 1013 Bq. The total amount of deposits in the gas circuit is about 14.3 tons. (authors)

  8. A review of the growth of V2O5 films from 1885 to 2010

    International Nuclear Information System (INIS)

    This year is the 125th anniversary of the first synthesis of V2O5 gels. The fascinating properties and wide application range of V2O5 thin films have attracted significant attention over the past decades. Its wide optical band gap, layered structure, good chemical and thermal stability and excellent thermoelectric and electrochromic properties have made V2O5 a promising material for industrial applications such as gas sensors, electrochromic devices, optical switching devices, and reversible cathode materials for Li batteries. Gels were the first form in which V2O5 was synthesized at the end of the 19th century. Interest started to grow in the 1980s due to the discovery of their semiconducting properties and their use in antistatic coatings in the photographic industry. The rapid development of the sol-gel process brought new interest in V2O5 gels. Following a short discussion of vanadium oxides and V2O5, I summarize all thin film preparation techniques known up to now and use reported optical band gaps to characterize different growth methods. An estimation of the Bohr radius for V2O5 is also presented. This article provides an up-to-date review of more than a century (1885-2010) of research on the growth of vanadium oxide thin films. Nonetheless, due to the huge number of publications in the field, only those are selected and described which, according to the author, contribute the most to the field's further development.

  9. Tyrosine-sulfated V2 peptides inhibit HIV-1 infection via coreceptor mimicry.

    Science.gov (United States)

    Cimbro, Raffaello; Peterson, Francis C; Liu, Qingbo; Guzzo, Christina; Zhang, Peng; Miao, Huiyi; Van Ryk, Donald; Ambroggio, Xavier; Hurt, Darrell E; De Gioia, Luca; Volkman, Brian F; Dolan, Michael A; Lusso, Paolo

    2016-08-01

    Tyrosine sulfation is a post-translational modification that facilitates protein-protein interaction. Two sulfated tyrosines (Tys173 and Tys177) were recently identified within the second variable (V2) loop of the major HIV-1 envelope glycoprotein, gp120, and shown to contribute to stabilizing the intramolecular interaction between V2 and the third variable (V3) loop. Here, we report that tyrosine-sulfated peptides derived from V2 act as structural and functional mimics of the CCR5 N-terminus and potently block HIV-1 infection. Nuclear magnetic and surface plasmon resonance analyses indicate that a tyrosine-sulfated V2 peptide (pV2α-Tys) adopts a CCR5-like helical conformation and directly interacts with gp120 in a CD4-dependent fashion, competing with a CCR5 N-terminal peptide. Sulfated V2 mimics, but not their non-sulfated counterparts, inhibit HIV-1 entry and fusion by preventing coreceptor utilization, with the highly conserved C-terminal sulfotyrosine, Tys177, playing a dominant role. Unlike CCR5 N-terminal peptides, V2 mimics inhibit a broad range of HIV-1 strains irrespective of their coreceptor tropism, highlighting the overall structural conservation of the coreceptor-binding site in gp120. These results document the use of receptor mimicry by a retrovirus to occlude a key neutralization target site and provide leads for the design of therapeutic strategies against HIV-1. PMID:27389109

  10. Application of heat storage in increasing operating flexibility of newly built WWER type reactor power plants in the CSSR for peak electric power generation and for offsetting plant capacity decrease due to heat supply

    International Nuclear Information System (INIS)

    In order to increase the production of electric energy during power peaks a method is suggested for heat storage. At the Dukovany nuclear power plant this is the heat storage in hot feed water based on heating a greater amount of turbine condensate. At the Jaslovske Bohunice nuclear power plant V-2 the possibility is being studied of securing heat offtake from the condensing turbines, this both for power and heating purposes. At the Mochovce nuclear power plant V-4 they are concerned with a combined generation of power and heat from the heating process water of turbines with modified design. The operation is described of the heat offtake from the heating process water at the Temelin nuclear power plant V-5. (M.D.)

  11. Electrochromic Properties of Sol-gel Deposited V2O5 and TiO2-V2O5 Binary Thin Films

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Transparent mixed phase (1 - x)V2O5-xTiO2 (x=0,0.1,0.2,0.3,0.4) thin films were prepared on indium tin oxide (ITO) coated glass via sol-gel process. The films were characterized by cyclic voltammetry, optical spectroscopy, scanning electron microscopy, IR and X-ray diffractometer.Electrochemical lithium insertion/extraction showed that the porous structure of sol-gel (1 -x)V2.O5-xTiO2 thin films exhibited good recharge ability of Li+/e- insertion/extraction process.For a 220 nm thick (1 - x)V2O5-xTiO2 film with 90% V2O5, the capacity of charge exchange reached 9 mC/cm2. In both Li+ intercalated and free states, the films were highly transparent to visible light. Such films have potential applications in counter electrodes for electrochromic smart windows and other electrochemical devices.

  12. On-board electric vehicle battery charger with enhanced V2H operation mode

    OpenAIRE

    Monteiro, Vítor Duarte Fernandes; Exposto, Bruno Fernandes; Pinto, J. G.; Almeida, Raul Fernando Silva; João C. Ferreira; Meléndez, Andrés A. Nogueiras; João L Afonso

    2014-01-01

    This paper proposes an on-board Electric Vehicle (EV) battery charger with enhanced Vehicle-to-Home (V2H) operation mode. For such purpose was adapted an on-board bidirectional battery charger prototype to allow the Grid-to-Vehicle (G2V), Vehicle-to-Grid (V2G) and V2H operation modes. Along the paper are presented the hardware topology and the control algorithms of this battery charger. The idea underlying to this paper is the operation of the on-board bidirectional ba...

  13. Color-Space-Based Visual-MIMO for V2X Communication

    OpenAIRE

    Jai-Eun Kim; Ji-Won Kim; Youngil Park; Ki-Doo Kim

    2016-01-01

    In this paper, we analyze the applicability of color-space-based, color-independent visual-MIMO for V2X. We aim to achieve a visual-MIMO scheme that can maintain the original color and brightness while performing seamless communication. We consider two scenarios of GCM based visual-MIMO for V2X. One is a multipath transmission using visual-MIMO networking and the other is multi-node V2X communication. In the scenario of multipath transmission, we analyze the channel capacity numerically and w...

  14. Preparation of V2 O5/V/V2O5 trilayer thin film and its photoelectric performance%V2O5/V/V2O5复合膜的制备及其光电性能研究

    Institute of Scientific and Technical Information of China (English)

    颜毓雷; 李合琴; 乔恺; 张学科; 周矗; 陶磊

    2014-01-01

    V2 O5/V/V2 O5 trilayer thin film with different deposition time of V layer was prepared on glass substrates by DC magnetron sputtering at room temperature . T hen all of the as-deposited V2 O5/V/V2 O5 trilayer thin film were annealed at 450 ℃ for 60 min under air atmosphere .The photo-electric performance of the V2 O5/V/V2 O5 trilayer thin film was studied by four-point probe measure-ment .The structure of the V2 O5/V/V2 O5 three-layer thin film was analyzed by X-ray diffraction (XRD) .The results show that the annealed V2 O5/V/V2 O5 trilayer thin film with 25 min of V layer deposition possesses a square resistance of 38 .5 kΩ ,a temperature coefficient of resistance (TCR) of-0 .021 8 K -1 and an infrared absorption of above 0 .6 at the band between 700 nm and 1 400 nm ,so it is suitable for the application of uncooled micro-bolometer .%文章采用直流磁控溅射法在玻璃衬底上制备了V2 O5/V/V2 O5复合膜,通过改变中间层钒的溅射时间,制备了3组薄膜。所有薄膜均在450℃空气气氛中退火60 min。用四探针测试仪测试了薄膜的电学性能,用X射线衍射仪对薄膜的结构组分进行分析。实验结果表明,当V层溅射时间为25 min时,经450℃退火后的薄膜方块电阻为38.5 kΩ,电阻温度系数为-0.0218 K -1,在700~1400 nm波段红外吸光度均在0.6以上,符合非致冷微测辐射热计的应用要求。

  15. Reactor Physics

    International Nuclear Information System (INIS)

    The Reactor Physics and MYRRHA Department of SCK-CEN offers expertise in various areas of reactor physics, in particular in neutronics calculations, reactor dosimetry, reactor operation, reactor safety and control and non-destructive analysis of reactor fuel. This expertise is applied in the Department's own research projects in the VENUS critical facility, in the BR1 reactor and in the MYRRHA project (this project aims at designing a prototype Accelerator Driven System). Available expertise is also used in programmes external to the Department such as the reactor pressure steel vessel programme, the BR2 reactor dosimetry, and the preparation and interpretation of irradiation experiments by means of neutron and gamma calculations. The activities of the Fuzzy Logic and Intelligent Technologies in Nuclear Science programme cover several domains outside the department. Progress and achievements in these topical areas in 2000 are summarised

  16. Reactor Physics

    International Nuclear Information System (INIS)

    SCK-CEN's Reactor Physics and MYRRHA Department offers expertise in various areas of reactor physics, in particular in neutron and gamma calculations, reactor dosimetry, reactor operation and control, reactor code benchmarking and reactor safety calculations. This expertise is applied in the Department's own research projects in the VENUS critical facility, in the BR1 reactor and in the MYRRHA project (this project aims at designing a prototype Accelerator Driven System). Available expertise is also used in programmes external to the Department such as the reactor pressure steel vessel programme, the BR2 materials testing reactor dosimetry, and the preparation and interpretation of irradiation experiments by means of neutron and gamma calculations. The activities of the Fuzzy Logic and Intelligent Technologies in Nuclear Science programme cover several domains outside the department. Progress and achievements in these topical areas in 2001 are summarised

  17. Reactor Physics

    Energy Technology Data Exchange (ETDEWEB)

    Ait Abderrahim, A

    2001-04-01

    The Reactor Physics and MYRRHA Department of SCK-CEN offers expertise in various areas of reactor physics, in particular in neutronics calculations, reactor dosimetry, reactor operation, reactor safety and control and non-destructive analysis of reactor fuel. This expertise is applied in the Department's own research projects in the VENUS critical facility, in the BR1 reactor and in the MYRRHA project (this project aims at designing a prototype Accelerator Driven System). Available expertise is also used in programmes external to the Department such as the reactor pressure steel vessel programme, the BR2 reactor dosimetry, and the preparation and interpretation of irradiation experiments by means of neutron and gamma calculations. The activities of the Fuzzy Logic and Intelligent Technologies in Nuclear Science programme cover several domains outside the department. Progress and achievements in these topical areas in 2000 are summarised.

  18. Experience from operation of WWER-440 model 213 nuclear power plants. Reference plant: Bohunice V2 (Slovakia). Report of the IAEA technical co-operation project RER/9/004 on evaluation of safety aspects of WWER-440 model 213 nuclear power plants

    International Nuclear Information System (INIS)

    This TECDOC provides a comprehensive review of the operational experience with WWER-440/213 plants. It is hoped that it will be useful to anyone working in the field of WWER safety, and in particular to experts planning, executing or reviewing studies related to the subject. Refs, figs and tabs

  19. Strength analyses of the bubbler condenser structure of WWER-440 model 213 nuclear power plants. Reference plant: Bohunice V2 (Slovakia). Report of the IAEA Technical Co-operation Project RER/9/004 on evaluation of safety aspects of WWER-440 model 213 nuclear power plants

    International Nuclear Information System (INIS)

    This publication addresses the topic of mechanical strength of the bubbler condenser applied in the WWER-440 model 213 plants and is intended to assist WWER-440/213 operators in the re-assessment of the bubbler condenser performance. It is hoped that it will also be useful to anyone working in the field of WWER safety, and in particular to experts planning, executing or reviewing studies related to the subject. Refs, figs and tabs

  20. Experimental design verification of WWER-440 model 213 nuclear power plants. Reference plant: Bohunice V2 (Slovakia). Report of the IAEA technical co-operation project RER/9/004 on evaluation of safety aspects of WWER-440 model 213 nuclear power plants

    International Nuclear Information System (INIS)

    This publication addresses the experimental research supporting the design of WWER-440 model 213 plants. it is hoped that the material presented will be useful for experts working in the field of WWER safety, and in particular to those planning, executing or reviewing studies related to the subject. Refs, figs and tabs

  1. Monitoring of I-131 after Fukushima nuclear power plant disaster and a correction of contribution of I-131 in the discharges of Slovenske elektrarne, Bohunice nuclear power plant

    International Nuclear Information System (INIS)

    After the earthquake and subsequent tsunami in March 2011 Fukushima nuclear power reactors in Japan were damaged. As a result of damage of reactors escaped into air iodine radioactive isotopes which were dispersed by air masses over Europe and Slovakia. Isotope I-131 was identified in samples of the atmosphere and the abstraction of Radiation Control SE EBO. The air from the atmosphere contaminated with isotopes of iodine from the Fukushima ventilation systems that do not contain iodine filters, sucked into the interior of the controlled area, then released in organised way and then measured in the ventilation chimneys of EBO NPP. The measured values thus entered a balance of radioactive discharges. Drain of I-131 from SE EBO was in that period plus a contribution coming from Fukushima NPP and measured activity I-131 had to be corrected.

  2. Reactor operation

    CERN Document Server

    Shaw, J

    2013-01-01

    Reactor Operation covers the theoretical aspects and design information of nuclear reactors. This book is composed of nine chapters that also consider their control, calibration, and experimentation.The opening chapters present the general problems of reactor operation and the principles of reactor control and operation. The succeeding chapters deal with the instrumentation, start-up, pre-commissioning, and physical experiments of nuclear reactors. The remaining chapters are devoted to the control rod calibrations and temperature coefficient measurements in the reactor. These chapters also exp

  3. Reactor safeguards

    CERN Document Server

    Russell, Charles R

    2013-01-01

    Reactor Safeguards provides information for all who are interested in the subject of reactor safeguards. Much of the material is descriptive although some sections are written for the engineer or physicist directly concerned with hazards analysis or site selection problems. The book opens with an introductory chapter on radiation hazards, the construction of nuclear reactors, safety issues, and the operation of nuclear reactors. This is followed by separate chapters that discuss radioactive materials, reactor kinetics, control and safety systems, containment, safety features for water reactor

  4. Variable Vector Countermeasure Suit (V2Suit) for Space Habitation and Exploration Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The “Variable Vector Countermeasure Suit (V2Suit) for Space Habitation and Exploration” is a visionary system concept that will revolutionize space...

  5. Structure of V2AlC studied by theory and experiment

    International Nuclear Information System (INIS)

    We have studied V2AlC (space group P63/mmc, prototype Cr2AlC) by ab initio calculations. The density of states (DOS) of V2AlC for antiferromagnetic, ferromagnetic, and paramagnetic configurations have been discussed. According to the analysis of DOS and cohesive energy, no significant stability differences between spin-polarized and non-spin-polarized configurations were found. Based on the partial DOS analysis, V2AlC can be classified as a strongly coupled nanolaminate according to our previous work [Z. Sun, D. Music, R. Ahuja, S. Li, and J. M. Schneider, Phys. Rev. B 70, 092102 (2004)]. Furthermore, this phase has been synthesized in the form of thin films by magnetron sputtering. The equilibrium volume, determined by x-ray diffraction, is in good agreement with the theoretical data, implying that ab initio calculations provide an accurate description of V2AlC

  6. Nonsewered population in the United States Pacific Northwest for 2002 summarized for NHDPlus v2 catchments

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This spatial data set was created by the U.S. Geological Survey (USGS) to represent the population within each incremental watershed delineated in the NHDPlus v2...

  7. Synthesis and Structure of Polypyrrole Derivatives/V2O5 Nanocomposites

    Institute of Scientific and Technical Information of China (English)

    Shi Chuang; Zhu Quan-yao; Shu Hong; Jiang Zhong-xing

    2004-01-01

    Poly(N,N,N-trimethyl-(2-pyrrol-1-yl)ethyl ammonium iodide)/V2O5(PTPAI/V2O5) nanocomposites were synthesized by sol-gel method. This method involved formation of vanadium pentoxide xerogel in the presence of polypyrrole derivatives solution. X-ray diffraction(XRD) indicated that the polypyrrole derivative particles encapsulated in the fibrous V2O5 network and the layered distance significantly increased from 1.077 39 to 1.354 56 nm. The interaction between polypyrrole and V2O5 in the 'nanocomposites' was characterized by IR spectroscopy. The Scanning Electron Microscope(SEM) micrographs reveal the structural contrasts between the hybrid materials and the pristine vanadium oxide xerogel.

  8. V2O5 thin film deposition for application in organic solar cells

    Science.gov (United States)

    Arbab, Elhadi A. A.; Mola, Genene Tessema

    2016-04-01

    Vanadium pentoxide V2O5 films were fabricated by way of electrochemical deposition technique for application as hole transport buffer layer in organic solar cell. A thin and uniform V2O5 films were successfully deposited on indium tin oxide-coated glass substrate. The characterization of surface morphology and optical properties of the deposition suggest that the films are suitable for photovoltaic application. Organic solar cell fabricated using V2O5 as hole transport buffer layer showed better devices performance and environmental stability than those devices fabricated with PEDOT:PSS. In an ambient device preparation condition, the power conversion efficiency increases by nearly 80 % compared with PEDOT:PSS-based devices. The devices lifetime using V2O5 buffer layer has improved by a factor of 10 over those devices with PEDOT:PSS.

  9. Variable Vector Countermeasure Suit (V2Suit) for Space Habitation and Exploration Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The Variable Vector Countermeasure Suit (V2Suit) is a specialized spacesuit designed to keep astronauts healthy during long-duration space exploration missions and...

  10. Fleet operator risks for using fleets for V2G regulation

    International Nuclear Information System (INIS)

    Future fleets of vehicles may include electric vehicles (EVs) or hybrid electric vehicles (HEVs) because of potential fuel savings. Recent demonstration of diesel parallel hybrids in a delivery fleet led to fuel economy improvements, and hybrid bus demonstrations exhibited twice the fuel economy of the conventional bus. Fleet ownership may include management of a fleet of vehicles as small as 10 units and as large as hundreds or thousands. In addition to fuel savings, the newer extended range electric vehicles (EREVs) and pure EVs permit vehicle to grid (V2G) opportunities. These V2G opportunities may present additional revenue for fleets by providing ancillary services to local grid independent system operators (ISOs), provided that the burden of driving and V2G services do not accelerate the degradation of the battery systems in these vehicles. The subject of this study is to determine the financial risks associated with accelerated battery degradation in a V2G-enabled EREV fleet expected to perform ancillary service duty while charging in addition to the normal loads of drive cycle duty. We determine that battery cycle life during V2G duty is a critical parameter, which can determine whether or not the business model is viable. - Highlights: ► V2G regulation cycle life of EREV batteries must be >50,000 cycles to be profitable. ► Present knowledge and test data about the impact of V2G cycles on battery life are limited. ► Replacement of batteries and energy throughput are major factors in the cost–benefit analysis. ► V2G fleet is not viable with present data but can be viable with some technical advancement.

  11. Vehicle-to-anything application (v2anything app) for electric vehicles

    OpenAIRE

    João C. Ferreira; Monteiro, Vítor Duarte Fernandes; Afonso, João L.

    2014-01-01

    This paper presents a mobile information system denominated as Vehicle-to-Anything Application (V2Anything App), and explains its conceptual aspects. This application is aimed at giving relevant information to Full Electric Vehicle (FEV) drivers, by supporting the integration of several sources of data in a mobile application, thus contributing to the deployment of the electric mobility process. The V2Anything App provides recommendations to the drivers about the FEV range autonomy, location ...

  12. Quasiparticle evolution and pseudogap formation in V2O3: An infrared spectroscopy study

    OpenAIRE

    Baldassarre, L.; Perucchi, A.; Nicoletti, D.; Toschi, A.; Sangiovanni, G.; Held, K.; M. Capone; Ortolani, M.; Malavasi, L.; Marsi, M.; Metcalf, P.; Postorino, P.; Lupi, S.

    2007-01-01

    The infrared conductivity of V2O3 is measured in the whole phase diagram. Quasiparticles appear above the Neel temperature TN and eventually disappear further enhancing the temperature, leading to a pseudogap in the optical spectrum above 425 K. Our calculations demonstrate that this loss of coherence can be explained only if the temperature dependence of lattice parameters is considered. V2O3 is therefore effectively driven from the metallic to the insulating side of the Mott transition as t...

  13. The Variable Vector Countermeasure Suit (V2Suit) for space habitation and exploration

    OpenAIRE

    Duda, Kevin R.; Vasquez, Rebecca A.; Middleton, Akil J.; Hansberry, Mitchell L.; Newman, Dava J.; Jacobs, Shane E.; West, John J.

    2015-01-01

    The “Variable Vector Countermeasure Suit (V2Suit) for Space Habitation and Exploration” is a novel system concept that provides a platform for integrating sensors and actuators with daily astronaut intravehicular activities to improve health and performance, while reducing the mass and volume of the physiologic adaptation countermeasure systems, as well as the required exercise time during long-duration space exploration missions. The V2Suit system leverages wearable kinematic monitoring tech...

  14. The Variable Vector Countermeasure Suit (V2Suit) for Space Habitation and Exploration

    OpenAIRE

    Duda, Kevin R.; Newman, Dava J.; Jacobs, Shane E.

    2015-01-01

    The “Variable Vector Countermeasure Suit (V2Suit) for Space Habitation and Exploration” is a novel system concept that provides a platform for integrating sensors and actuators with daily astronaut intravehicular activities to improve health and performance, while reducing the mass and volume of the physiologic adaptation countermeasure systems, as well as the required exercise time during long-duration space exploration missions. The V2Suit system leverages wearable kinematic monitoring tec...

  15. Encouraging vehicle-to-grid (V2G) participation through premium tariff rates

    Science.gov (United States)

    Richardson, David B.

    2013-12-01

    The provision of vehicle-to-grid (V2G) services to an electric grid by electric vehicles (EVs) can potentially reduce the cost of vehicle ownership through revenue generation. Recent studies indicate that yearly vehicle profit from V2G may not be sufficient to induce widespread participation. This paper investigates the feasibility of a premium tariff rate for V2G power, similar to current feed-in-tariff (FIT) programs for renewable energy. Using Ontario, Canada as a case study, an hourly time-series model for a fleet of commuter EVs is created. Tariff rates for V2G peak power are calculated based on the same return on investment as the current FIT for renewable energy in Ontario. The tariff rates are competitive with the renewable energy tariffs, especially when EVs are allowed to provide ancillary services to the grid in addition to peak power. Despite the guaranteed rate of return, yearly vehicle profit is low. Two variations are considered to increase vehicle profit, thereby enhancing the attractiveness of V2G. A higher return on investment is favored over direct benefits offered to EV owners. A higher return on investment may be justifiable based on the higher level of risk inherent in V2G when compared to renewable energy.

  16. Doping of Co into V2O5 nanoparticles enhances photodegradation of methylene blue

    International Nuclear Information System (INIS)

    Highlights: • Co-doped V2O5 nanoparticles are synthesized by thermal decomposition method. • The nanoparticles are used as photocatalyst for the first time. • Doped samples exhibited enhanced photodegradation property. • Observed enhanced activity is due to Co and plausible mechanism has been proposed. - Abstract: V2O5 nanoparticles doped with different amounts of (x = 2%, 5% and 10%) Co was successfully synthesized by thermal decomposition method with the purpose of enhancing their photodegradation performance under visible light irradiation. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), Raman, UV–Vis, photoluminescence (PL) spectroscopy, field emission scanning electron microscopy (FE-SEM) and high resolution transmission electron microscopy (HR-TEM). The photodegradation property of the prepared pure V2O5 and Co-V2O5 nanoparticles were investigated by using aqueous solution of methylene blue (MB) under visible light irradiation. The obtained results clearly indicated that the amount of Co has significant effect on the photodegradation of MB. Particularly, 10%Co-V2O5 nanoparticles exhibits enhanced photodegradation property than the pure, 2% and 5%Co-doped samples. A plausible mechanism was put forth for such significant improvements in photodegradation performance of Co-V2O5

  17. Research Reactors

    Energy Technology Data Exchange (ETDEWEB)

    Martens, Frederick H. [Argonne National Laboratory; Jacobson, Norman H.

    1968-09-01

    This booklet discusses research reactors - reactors designed to provide a source of neutrons and/or gamma radiation for research, or to aid in the investigation of the effects of radiation on any type of material.

  18. Measurement and evaluation with control computer of reactor core temperature field

    International Nuclear Information System (INIS)

    A modular system is suggested of monitoring the temperature field of the WWER reactor core. Standard measurements were completed with specified measurements and evaluation of coolant heating, with tests of functionality of measuring chains for coolant temperature at the fuel assembly outlet, changes in the offset of the thermocouple cold ends and with the evaluation of thermal and hydraulic characteristics of the core and of the primary circuit. Experience is presented with the application of this system based on the hardware and software of the RPP-16S control and computer system of the first and second units of the Bohunice V-1 nuclear power plant. Described are the structure of computer subsystems, the design of algorithms for data acquisition, testing of the credibility of temperatures measured with thermocouples, the processing of measured values and the algorithm for reactor heating computations. The system has been proven, and specified measurements made it possible to maintain a more stable and more accurate thermal output of the reactor. (M.D.)

  19. Research reactors

    International Nuclear Information System (INIS)

    This article proposes an overview of research reactors, i.e. nuclear reactors of less than 100 MW. Generally, these reactors are used as neutron generators for basic research in matter sciences and for technological research as a support to power reactors. The author proposes an overview of the general design of research reactors in terms of core size, of number of fissions, of neutron flow, of neutron space distribution. He outlines that this design is a compromise between a compact enough core, a sufficient experiment volume, and high enough power densities without affecting neutron performance or its experimental use. The author evokes the safety framework (same regulations as for power reactors, more constraining measures after Fukushima, international bodies). He presents the main characteristics and operation of the two families which represent almost all research reactors; firstly, heavy water reactors (photos, drawings and figures illustrate different examples); and secondly light water moderated and cooled reactors with a distinction between open core pool reactors like Melusine and Triton, pool reactors with containment, experimental fast breeder reactors (Rapsodie, the Russian BOR 60, the Chinese CEFR). The author describes the main uses of research reactors: basic research, applied and technological research, safety tests, production of radio-isotopes for medicine and industry, analysis of elements present under the form of traces at very low concentrations, non destructive testing, doping of silicon mono-crystalline ingots. The author then discusses the relationship between research reactors and non proliferation, and finally evokes perspectives (decrease of the number of research reactors in the world, the Jules Horowitz project)

  20. Reactor physics and reactor computations

    International Nuclear Information System (INIS)

    Mathematical methods and computer calculations for nuclear and thermonuclear reactor kinetics, reactor physics, neutron transport theory, core lattice parameters, waste treatment by transmutation, breeding, nuclear and thermonuclear fuels are the main interests of the conference

  1. Pyridine-H5PMo10V2O40 hybrid catalysts for liquid-phase hydroxylation of benzene to phenol with molecular oxygen

    Institute of Scientific and Technical Information of China (English)

    GE HanQing; LENG Yan; ZHANG FuMin; PIAO JiaRui; ZHOU ChangJiang; WANG Jun

    2009-01-01

    Pyridine(Py)-modified Keggin-type vanadium-substituted heteropoly acids (PynPMo10V2O40,n=1 to 5) were prepared by a precipitation method as organic/inorganic hybrid catalysts for direct hydroxylation of benzene to phenol in a pressured batch reactor and their structures were detected by FT-IR.Among various catalysts,Py3PMo10V2O40 exhibits the highest catalytic activity (yield of phenol,11.5%),without observing the formation of catechol,hydroquinone and benzoquinone in the reaction with 80 vol% aqueous acetic acid,molecular oxygen and ascorbic acid used as the solvent,oxidant and reducing reagent,respectively.Influences of reaction temperature,reaction time,oxygen pressure,amount of ascorbic acid and catalyst on yield of phenol were investigated to obtain the optimal reaction conditions for phenol formation.Pyridine can greatly promote the catalytic activity of the Py-free catalyst (H5PMo10V2O40),mostly because the organic π electrons in the hybrid catalyst may extend their conjugation to the inorganic framework of heteropoly acid and dramatically modify the redox properties,at the same time,pyridine adsorbed on heteropoly acids can promote the effect of "pseudo-liquid phase",thus accounting for the enhancement of phenol yield.

  2. Research reactors

    International Nuclear Information System (INIS)

    There are currently 284 research reactors in operation, and 12 under construction around the world. Of the operating reactors, nearly two-thirds are used exclusively for research, and the rest for a variety of purposes, including training, testing, and critical assembly. For more than 50 years, research reactor programs have contributed greatly to the scientific and educational communities. Today, six of the world's research reactors are being shut down, three of which are in the USA. With government budget constraints and the growing proliferation concerns surrounding the use of highly enriched uranium in some of these reactors, the future of nuclear research could be impacted

  3. Reactor container

    International Nuclear Information System (INIS)

    Object: To provide a jet and missile protective wall of a configuration being inflated toward the center of a reactor container on the inside of a body of the reactor container disposed within a biological shield wall to thereby increase safety of the reactor container. Structure: A jet and missile protective wall comprised of curved surfaces internally formed with a plurality of arch inflations filled with concrete between inner and outer iron plates and shape steel beam is provided between a reactor container surrounded by a biological shield wall and a thermal shield wall surrounding the reactor pressure vessel, and an adiabatic heat insulating material is filled in space therebetween. (Yoshino, Y.)

  4. Sintering of Ti-10V-2Fe-3Al and mechanical properties

    International Nuclear Information System (INIS)

    Highlights: → Densification is only the first step for the sintering of Ti-10V-2Fe-3Al. → Master alloy selection or design of sintering pathway is the real challenge. → The use of 10V-2Fe-3Al master alloy is preferred to the use of 85V-15Al. → Sintering of Ti-10V-2Fe-3Al is mainly controlled by the self-diffusion of Ti. - Abstract: A comprehensive study has been made of the sintering and microstructural evolution of Ti-10V-2Fe-3Al compacted from titanium and master alloy powder blends. The densification of Ti-10V-2Fe-3Al at ≤1300 deg. C occurs by solid-state sintering with apparent activation energy of 163 ± 13 kJ/mol, which falls into the reported activation energy range for the self-diffusion of titanium. The sintered density depends primarily on the titanium powder size while the sintered microstructure and mechanical properties depend mainly on the master alloy type or diffusion of vanadium. The real challenge for the fabrication of Ti-10V-2Fe-3Al by sintering is not densification, which is trivial with relatively fine titanium powder. Rather, it is the realisation of a desired microstructure through master alloy selection or design of the sintering pathway, which determines the distribution of the principal alloying element V, a slow diffuser in β-Ti. This distinguishes it from the sintering of lean alloys, where the focus has predominantly been on densification. The use of 10V-2Fe-3Al master alloy produced more uniform microstructures and therefore much better ductility than the use of 85V-15Al at similar densities.

  5. Calculational experimental examination and ensuring of equipment and pipelines seismic resistance at starting and operating water-cooled and moderated reactor WWER-type NPPs. Final report

    International Nuclear Information System (INIS)

    The results of testing of equipment at Bohunice NPP and pipeline systems at Unit 3 of Kozloduy NPP (WWER-440 type reactors) are presented in this Final Report. These results side by side with experimental values of natural frequencies and decrements also include experimental data about vibration modes of tested equipment and pipelines. For the first time the results of new calculational-experimental examination of equipment seismic resistance at Unit 2 of Armenian NPP are presented. At Kozloduy NPP direction's request the planed additional tests of some selected items were put off on 1997. Instead of postponed tests we carried out detailed analysis of our past inspections of numerous equipment seismic resistance at the Unit 5 of Kozloduy NPP. Experimental data with results of additional analysis are presented

  6. Statistical analysis of the vibration loading of the reactor internals and fuel assemblies of reactor units type WWER-440 from deferent projects

    International Nuclear Information System (INIS)

    In this paper the following items have been presented: 1) Vibration noise instrument channels; 2) Vibration loading characteristics of control assemblies, internals and design peculiarities of internals of WWER-440 deferent projects; 3) Coolant flow rate through the reactor, reactor core, fuel assemblies and control assemblies for different projects WWER-440 and 4) Noise measurements of coolant speed per channel. The change of auto power spectrum density of absolute displacement detector signal for the last 12 years of SUS monitoring of the Kola NPP unit 2; the coherence functions groups between two SPND of the same level for the Kola NPP unit 1; the measured coolant flow rate at Paks NPP and the auto power spectrum density group of SPND signals from 11 neutron measuring channels of the Kola NPP unit 1 are given. The main factors of vibration loading of internals and fuel assemblies for Kola NPP units 1-4, Bohunice NPP units 1 and 2 and Novovoronezh NPP units 3 and 4 are also discussed

  7. A Hierarchical Statistical Model of Natural Images Explains Tuning Properties in V2.

    Science.gov (United States)

    Hosoya, Haruo; Hyvärinen, Aapo

    2015-07-22

    Previous theoretical and experimental studies have demonstrated tight relationships between natural image statistics and neural representations in V1. In particular, receptive field properties similar to simple and complex cells have been shown to be inferable from sparse coding of natural images. However, whether such a relationship exists in higher areas has not been clarified. To address this question for V2, we trained a sparse coding model that took as input the output of a fixed V1-like model, which was in its turn fed a large variety of natural image patches as input. After the training, the model exhibited response properties that were qualitatively and quantitatively compatible with three major neurophysiological results on macaque V2, as follows: (1) homogeneous and heterogeneous integration of local orientations (Anzai et al., 2007); (2) a wide range of angle selectivities with biased sensitivities to one component orientation (Ito and Komatsu, 2004); and (3) exclusive length and width suppression (Schmid et al., 2014). The reproducibility was stable across variations in several model parameters. Further, a formal classification of the internal representations of the model units offered detailed interpretations of the experimental data, emphasizing that a novel type of model cell that could detect a combination of local orientations converging toward a single spatial point (potentially related to corner-like features) played an important role in reproducing tuning properties compatible with V2. These results are consistent with the idea that V2 uses a sparse code of natural images. Significance statement: Sparse coding theory has successfully explained a number of receptive field properties in V1; but how about in V2? This question has recently become important since a variety of properties distinct from V1 have been discovered in V2, and thus a more integrative understanding is called for. Our study shows that a hierarchical sparse coding model of

  8. Overview of the independent ASTEC V2.0 validation by SARNET partners

    Energy Technology Data Exchange (ETDEWEB)

    Chatelard, Patrick, E-mail: patrick.chatelard@irsn.fr [Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES/SAG, Cadarache, Saint-Paul-lez-Durance 13115 (France); Arndt, Siegfried [GRS, Berlin (Germany); Atanasova, Boryana [INRNE, Sofia (Bulgaria); Bandini, Giacomino [ENEA, Bologne (Italy); Bleyer, Alexandre [Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES/SAG, Cadarache, Saint-Paul-lez-Durance 13115 (France); Brähler, Thimo [RUB, Bochum (Germany); Buck, Michael [IKE, Stuttgart (Germany); Kljenak, Ivo [JSI, Ljubljana (Slovenia); Kujal, Bohumir [UJV, Rez (Czech Republic)

    2014-06-01

    Significant efforts are put into the assessment of the severe accident integral code ASTEC, jointly developed since several years by IRSN and GRS, either through comparison with results of the most important international experiments or through benchmarks with other severe accident simulation codes on plant applications. These efforts are done in first priority by the code developers’ organisations, IRSN and GRS, and also by numerous partners, in particular in the frame of the SARNET European network. The first version of the new series ASTEC V2 had been released in July 2009 to SARNET partners. Two subsequent V2.0 code revisions, including several modelling improvements, have been then released to the same partners, respectively in 2010 and 2011. This paper summarises first the approach of ASTEC validation vs. experiments, along with a description of the validation matrix, and presents then a few examples of applications of the ASTEC V2.0-rev1 version carried out in 2011 by the SARNET users. These calculation examples are selected in a way to cover diverse aspects of severe accident phenomenology, i.e. to cover both in-vessel and ex-vessel processes, in order to provide a good picture of the current ASTEC V2 capabilities. Finally, the main lessons drawn from this joint validation task are summarised, along with an evaluation of the current physical modelling relevance and thus an identification of the ASTEC V2.0 validity domain.

  9. Ionic liquid intercalated V2O5 nanorods: synthesis and characterization

    Indian Academy of Sciences (India)

    K Manjunath; V D’Souza; J Dupont; T Ramakrishnappa; G Nagaraju

    2015-09-01

    In this work, ionic liquid (IL) intercalated V2O5 (IL-V2O5) nanorods have been synthesized through the IL-assisted hydrothermal method using imidazolium-based functionalized IL at 130°C for 3 days. The structure and morphology of the obtained product was characterized using various techniques. X-ray diffraction pattern reveals the intercalation of IL at 2 = 7° in orthorhombic V2O5. The Fourier transform infrared spectrum shows a band at 1044 cm–1, which could be assigned to stretching vibration of terminal vanadyl (V=O), sensitive to cation intercalation between vanadium oxide layers. UV–vis absorption spectrum of IL-V2O5 nanorods and calcined V2O5 nanoparticles show a maximum absorbance at 402 and 420 nm, respectively. The morphology of the product was investigated by scanning electron microscopy and transition electron microscopy (TEM). TEM analysis reveals the nanorods with thickness of 30–50 nm.

  10. Fabrication of V2O5 with various morphologies for high-performance electrochemical capacitor

    Science.gov (United States)

    Zhang, Yifu; Zheng, Jiqi; Zhao, Yunfeng; Hu, Tao; Gao, Zhanming; Meng, Changgong

    2016-07-01

    Three types of V2O5 structures including nanobelts, nanoparticles and microspheres were synthesized by a simple hydrothermal route and combination of calcination. The morphology of the sample depends on the quantity of oxalic acid used in the experiments. V2O5 nanobelts, nanoparticles and microspheres were respectively obtained when 0.63, 1.89 and 3.78 g of oxalic acid were used. The composition, morphology and structure of the samples were characterized by XRD, IR, SEM and TEM, respectively. The electrochemical properties of V2O5 nanobelts, nanoparticles and microspheres as electrodes in a supercapacitor device were measured using cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD). The electrochemical results indicate that V2O5 microspheres lead to a significant improvement of storage capacity and they show the largest specific capacitance of 308 F g-1 when used as supercapacitor electrode in 1 mol L-1 LiNO3 electrolyte. It turns out that V2O5 microsphere is an ideal material compared with other morphologies for supercapacitor electrode in the present work.

  11. Highly Flexible Self-Assembled V2O5 Cathodes Enabled by Conducting Diblock Copolymers

    Science.gov (United States)

    An, Hyosung; Mike, Jared; Smith, Kendall A.; Swank, Lisa; Lin, Yen-Hao; L. Pesek, Stacy; Verduzco, Rafael; Lutkenhaus, Jodie L.

    2015-09-01

    Mechanically robust battery electrodes are desired for applications in wearable devices, flexible displays, and structural energy and power. In this regard, the challenge is to balance mechanical and electrochemical properties in materials that are inherently brittle. Here, we demonstrate a unique water-based self-assembly approach that incorporates a diblock copolymer bearing electron- and ion-conducting blocks, poly(3-hexylthiophene)-block-poly(ethyleneoxide) (P3HT-b-PEO), with V2O5 to form a flexible, tough, carbon-free hybrid battery cathode. V2O5 is a promising lithium intercalation material, but it remains limited by its poor conductivity and mechanical properties. Our approach leads to a unique electrode structure consisting of interlocking V2O5 layers glued together with micellar aggregates of P3HT-b-PEO, which results in robust mechanical properties, far exceeding the those obtained from conventional fluoropolymer binders. Only 5 wt % polymer is required to triple the flexibility of V2O5, and electrodes comprised of 10 wt % polymer have unusually high toughness (293 kJ/m3) and specific energy (530 Wh/kg), both higher than reduced graphene oxide paper electrodes. Furthermore, addition of P3HT-b-PEO enhances lithium-ion diffusion, eliminates cracking during cycling, and boosts cyclability relative to V2O5 alone. These results highlight the importance of tradeoffs between mechanical and electrochemical performance, where polymer content can be used to tune both aspects.

  12. V_2O_5复合薄膜材料的制备

    Institute of Scientific and Technical Information of China (English)

    王爱荣; 吴广明; 杨辉宇; 张明霞; 周斌; 牛锡贤; 汪国庆; 沈军

    2008-01-01

    本文采用了单壁碳纳米管(SWCNTs)与V2O5气凝胶进行复合。首先采用混酸处理的方法对SWCNTs进行预处理,然后与V2O5溶胶进行复合。V2O5复合气凝胶薄膜材料的制备过程,主要是以V2O5粉末、苯甲醇(BA)、异丙醇(IP)和SWCNTs为原料,采用溶胶-凝胶法、提拉法镀膜和溶剂替换的方法来制备。利用紫外-可见-近红外分光光度计、傅里叶红外光谱仪、原子力显微镜、透射和扫描电子显微镜等表征手段,研究了SWCNTs复合V2O5气凝胶薄膜材料的结构和热处理对薄膜性能的影响。

  13. Concurrent validity of the Microsoft Kinect for Windows v2 for measuring spatiotemporal gait parameters.

    Science.gov (United States)

    Dolatabadi, Elham; Taati, Babak; Mihailidis, Alex

    2016-09-01

    This paper presents a study to evaluate the concurrent validity of the Microsoft Kinect for Windows v2 for measuring the spatiotemporal parameters of gait. Twenty healthy adults performed several sequences of walks across a GAITRite mat under three different conditions: usual pace, fast pace, and dual task. Each walking sequence was simultaneously captured with two Kinect for Windows v2 and the GAITRite system. An automated algorithm was employed to extract various spatiotemporal features including stance time, step length, step time and gait velocity from the recorded Kinect v2 sequences. Accuracy in terms of reliability, concurrent validity and limits of agreement was examined for each gait feature under different walking conditions. The 95% Bland-Altman limits of agreement were narrow enough for the Kinect v2 to be a valid tool for measuring all reported spatiotemporal parameters of gait in all three conditions. An excellent intraclass correlation coefficient (ICC2, 1) ranging from 0.9 to 0.98 was observed for all gait measures across different walking conditions. The inter trial reliability of all gait parameters were shown to be strong for all walking types (ICC3, 1 > 0.73). The results of this study suggest that the Kinect for Windows v2 has the capacity to measure selected spatiotemporal gait parameters for healthy adults. PMID:27387901

  14. Chx10 Consolidates V2a Interneuron Identity through Two Distinct Gene Repression Modes.

    Science.gov (United States)

    Clovis, Yoanne M; Seo, So Yeon; Kwon, Ji-Sun; Rhee, Jennifer C; Yeo, Sujeong; Lee, Jae W; Lee, Seunghee; Lee, Soo-Kyung

    2016-08-01

    During development, two cell types born from closely related progenitor pools often express identical transcriptional regulators despite their completely distinct characteristics. This phenomenon implies the need for a mechanism that operates to segregate the identities of the two cell types throughout differentiation after initial fate commitment. To understand this mechanism, we investigated the fate specification of spinal V2a interneurons, which share important developmental genes with motor neurons (MNs). We demonstrate that the paired homeodomain factor Chx10 functions as a critical determinant for V2a fate and is required to consolidate V2a identity in postmitotic neurons. Chx10 actively promotes V2a fate, downstream of the LIM-homeodomain factor Lhx3, while concomitantly suppressing the MN developmental program by preventing the MN-specific transcription complex from binding and activating MN genes. This dual activity enables Chx10 to effectively separate the V2a and MN pathways. Our study uncovers a widely applicable gene regulatory principle for segregating related cell fates. PMID:27477290

  15. Synthesis and Biological Evaluation of Substituted Desloratadines as Potent Arginine Vasopressin V2 Receptor Antagonists

    Directory of Open Access Journals (Sweden)

    Shuai Mu

    2014-02-01

    Full Text Available Twenty-one non-peptide substituted desloratadine class compounds were synthesized as novel arginine vasopressin receptor antagonists from desloratadine via successive acylation, reduction and acylation reactions. Their structures were characterized by 1H-NMR and HRMS, their biological activity was evaluated by in vitro and in vivo studies. The in vitro binding assay and cAMP accumulation assay indicated that these compounds are potent selective V2 receptor antagonists. Among them compounds 1n, 1t and 1v exhibited both high affinity and promising selectivity for V2 receptors. The in vivo diuretic assay demonstrated that 1t presented remarkable diuretic activity. In conclusion, 1t is a potent novel AVP V2 receptor antagonist candidate.

  16. Structure of recombinant Ves v 2 at 2.0 Angstrom resolution

    DEFF Research Database (Denmark)

    Skov, Lars K; Seppälä, Ulla; Coen, Jeremy J F;

    2006-01-01

    Wasp venom from Vespula vulgaris contains three major allergens: Ves v 1, Ves v 2 and Ves v 5. Here, the cloning, expression, biochemical characterization and crystal structure determination of the hyaluronidase Ves v 2 from family 56 of the glycoside hydrolases are reported. The allergen was...... of recombinant Ves v 2 was determined at 2.0 A resolution and reveals a central (beta/alpha)(7) core that is further stabilized by two disulfide bonds (Cys19-Cys308 and Cys185-Cys197). Based on sequence alignments and structural comparison with the honeybee allergen Api m 2, it is proposed that a...... conserved cavity near the active site is involved in binding of the substrate. Surface epitopes and putative glycosylation sites have been compared with those of two other major group 2 allergens from Apis mellifera (honeybee) and Dolichovespula maculata (white-faced hornet). The analysis suggests that the...

  17. Mechanism of oxygen ion transfer in oxide melts based on V2O5

    Science.gov (United States)

    Klimashin, A. A.; Belousov, V. V.

    2016-01-01

    A model of oxygen ion transport in molten V2O5 is proposed. Within the framework of this model, the values of the parabolic rate constant of the catastrophic oxidation of copper in contact with V2O5 and oxygen flux through an ion transport membrane with liquid-channel grain-boundary structure on the basis of V2O5 are calculated as k'' = 2.4 × 10-5 kg2/(m4 s) and J = 2.7 × 10-4 mol/(m2 s) at 700°C. These values are in agreement with the experimental data in order of magnitude, indicating the agreement between theory and experiment.

  18. 51V-NMR study of the Kagome staircase compound Co3V2O8

    International Nuclear Information System (INIS)

    Kagome staircase compound Co3V2O8 (S = 3/2) has a structure very similar to multiferroic compound Ni3V2Og (S = 1), but their magnetic phase diagrams differ noticeably. We present the results of the first NMR study in Co3V2O8 single crystal. From 51V-NMR spectra, the components of electric field gradient (EFG) tensor and of magnetic shifts tensor, Ki, are obtained. The temperature dependences of NMR shifts 51Ki for each main crystal axis direction are well described by a spin contributions in the paramagnetic phase. In ferromagnetic phase the zero field 51V-NMR spectrum is observed in the temperature range of 1.5-6.3 K.

  19. About a new metastable compound: Zn4V2O9

    International Nuclear Information System (INIS)

    For the first time Zn4V2O9 was prepared and investigated by single crystal X-ray methods. The metastable compound exists between a CO2-Laser generated flux and the solid ZnO/V2O5 material. The quenched light brown crystals show a monoclinic symmetry (space group C22-P21, a=10.488(5), b=8.198(6), c=9.682(5) A; β=118.66(4)0; Z=4). Zn4V2O9 has a characteristic Zn/O-framework with incorporated V5+ in tetrahedral coordination. The relationship to Zn4Ta2O9 and the calculation of the madelung part of lattice energy (MAPLE) in respect to the metastable character are discussed. (Author)

  20. Dependence of V2 illusory contour response on V1 cell properties and topographic organization.

    Science.gov (United States)

    Cohen, Amelia; Buia, Calin; Tiesinga, Paul

    2014-06-01

    An illusory contour is an image that is perceived as a contour in the absence of typical contour characteristics, such as a change in luminance or chromaticity across the stimulus. In cats and primates, cells that respond to illusory contours are sparse in cortical area V1, but are found in greater numbers in cortical area V2. We propose a model capable of illusory contour detection that is based on a realistic topographic organization of V1 cells, which reproduces the responses of individual cell types measured experimentally. The model allows us to explain several experimentally observed properties of V2 cells including variability in orientation tuning and inducer spacing preference. As a practical application, the model can be used to estimate the relationship between the severity of a cortical injury in the primary visual cortex and the deterioration of V2 cell responses to real and illusory contours. PMID:24801874

  1. Measurement-based Evaluation of the Impact of Large Vehicle Shadowing on V2X Communications

    DEFF Research Database (Denmark)

    Rodriguez, Ignacio; Portela Lopes de Almeida, Erika; Lauridsen, Mads;

    2016-01-01

    -based evaluation of large vehicle shadowing at 5.8 GHz in V2X scenarios. The receiver antenna height is fixed to average vehicular height (1.5 m), while the transmitter antennas are located at different heights (1.5, 5, and 7 m) in order to investigate both V2V and V2I scenarios. A truck was used to obstruct the...... depend on the transmitter antenna height, reaching maximum values of 21-23 dB. The statistical analysis also shows that the differences in shadow level due to the non-symmetries of the obstacle truck are in the order of approximately 2 dB. A simple 3D ray-tracing simulation is validated against the...

  2. Correlating Lithium Hydroxyl Accumulation with Capacity Retention in V2O5 Aerogel Cathodes.

    Science.gov (United States)

    Wangoh, Linda W; Huang, Yiqing; Jezorek, Ryan L; Kehoe, Aoife B; Watson, Graeme W; Omenya, Fredrick; Quackenbush, Nicholas F; Chernova, Natasha A; Whittingham, M Stanley; Piper, Louis F J

    2016-05-11

    V2O5 aerogels are capable of reversibly intercalating more than 5 Li(+)/V2O5 but suffer from lifetime issues due to their poor capacity retention upon cycling. We employed a range of material characterization and electrochemical techniques along with atomic pair distribution function, X-ray photoelectron spectroscopy, and density functional theory to determine the origin of the capacity fading in V2O5 aerogel cathodes. In addition to the expected vanadium redox due to intercalation, we observed LiOH species that formed upon discharge and were only partially removed after charging, resulting in an accumulation of electrochemically inactive LiOH over each cycle. Our results indicate that the tightly bound water that is necessary for maintaining the aerogel structure is also inherently responsible for the capacity fade. PMID:27104947

  3. Vasopressin receptors V1a and V2 are not osmosensors.

    Science.gov (United States)

    Lykke, Kasper; Assentoft, Mette; Fenton, Robert A; Rosenkilde, Mette M; MacAulay, Nanna

    2015-08-01

    Herein, we investigated whether G protein-coupled signaling via the vasopressin receptors of the V1a and V2 subtypes (V1aR and V2R) could be obtained as a direct response to hyperosmolar challenges and/or whether hyperosmolar challenges could augment classical vasopressin-dependent V1aR signaling. The V1aR-dependent response was monitored indirectly via its effects on aquaporin 4 (AQP4) when heterologously expressed in Xenopus oocytes and V1aR and V2R function was directly monitored following heterologous expression in COS-7 cells. A tendency toward an osmotically induced, V1aR-mediated reduction in AQP4-dependent water permeability was observed, although osmotic challenges failed to mimic vasopressin-dependent V1aR-mediated internalization of AQP4. Direct monitoring of inositol phosphate (IP) production of V1aR-expressing COS-7 cells demonstrated an efficient vasopressin-dependent response that was, however, independent of hyperosmotic challenges. Similarly, the cAMP production by the V2R was unaffected by hyperosmotic challenges although, in contrast to the V1aR, the V2R displayed an ability to support alternative signaling (IP production) at higher concentration of vasopressin. V1aR and V2R respond directly to vasopressin exposure, but they do not have an ability to act as osmo- or volume sensors when exposed to an osmotic gradient in the absence or presence of vasopressin. PMID:26311834

  4. Implementation of control rod movement and boron injection options by using control variables in RELAP5/PARCS v2.7 coupled code

    International Nuclear Information System (INIS)

    To efficiently characterize realistic transients, as the Reactivity Insertion Accidents (RIA), using coupled neutronic-thermal-hydraulic 3D best estimate system codes, like RELAP5/PARCS v2.7 coupled code, it is necessary to introduce some improvements in simulations by adding the capability of control rod movement and boron injection by means of RELAP5 control variables, with the aim of being able to analyze dynamically asymmetric transient accidents in a nuclear power reactor, like RIA, reproducing all control systems present in commercial reactors. In actual neutron kinetics codes, control rods banks do not have the possibility of dynamic movement during the simulation of a transient; besides it is necessary to send the boron concentration from the thermal-hydraulic code to the neutronic code to account for changes in cross-sections due to boron dilution. For instance, control rod movements are pre-programmed with simple instructions introduced before the beginning of the calculation. Hence, control rod positions are not related to the core characteristics and the control systems at any time of the simulation. This work presents the changes introduced in RELAP5/PARCS v2.7 codes to achieve that control rods and the boron injection become more dynamic and realistic components in such kind of simulators. With these modifications, control rods can be moved automatically, activated by the RELAP code control system, and also they can depend on signals related to the reactor activity, like pressure, fuel temperature or moderator temperature, etc., improving the realism of the calculation and widening the simulation possibilities. RELAP5 calculates the boron concentration in each node of the channels representing the reactor core, sending this information to the PARCS neutronic code. The environment of work chosen have been the graphical environment of programming Compaq Visual Fortran 6.6A (CVF 6.6A). The fundamental reasons have been, on the one hand the facility of

  5. Influence of the vacuum interface on the charge distribution in V 2 O 3 thin films

    KAUST Repository

    Schwingenschlögl, Udo

    2009-09-22

    The electronic structure of V2O3 thin films is studied by means of the augmented spherical wave method as based on density functional theory and the local density approximation. We establish that the effects of charge redistribution, induced by the vacuum interface, in such films are restricted to a very narrow surface layer of ≈15 Å thickness. As a consequence, charge redistribution can be ruled out as a source of the extraordinary thickness dependence of the metal–insulator transition observed in V2O3 thin films of ~100–1000 Å thickness.

  6. Influence of the vacuum interface on the charge distribution in V2O3 thin films

    Science.gov (United States)

    Schwingenschlögl, U.; Frésard, R.; Eyert, V.

    2009-09-01

    The electronic structure of V2O3 thin films is studied by means of the augmented spherical wave method as based on density functional theory and the local density approximation. We establish that the effects of charge redistribution, induced by the vacuum interface, in such films are restricted to a very narrow surface layer of ≈15 Å thickness. As a consequence, charge redistribution can be ruled out as a source of the extraordinary thickness dependence of the metal-insulator transition observed in V2O3 thin films of ~100-1000 Å thickness.

  7. Subsolidus Phase Relations in the ZnO-BaO-V2O5 System

    Institute of Scientific and Technical Information of China (English)

    ZHENG Meng; LV Pei-Wen; CHEN Da-Gui; YAN Feng-Bo; HUANG Feng

    2013-01-01

    The subsolidus phase relations of the ZnO-BaO-V2O5 ternary systems were investigated by means of X-ray diffraction analysis.There are three ternary compounds,nine binary compounds and sixteen 3-phase regions found in this system.The crystal structure of the ternary compound Ba2ZnV2O8 was refined by Rietveld profile fitting method and the powder diffraction pattern is given.A new ternary compound Ba3.4Zn0.8V4O14.2 has been found by the powder diffraction pattern.

  8. Magnetic phase diagram of the kagome staircase Co3V2O8

    International Nuclear Information System (INIS)

    Magnetization and specific heat measurements have been performed for the S=3/2 antiferromagnet on a kagome staircase, Co3V2O8 single crystal as a function of temperature and magnetic field . Using these data the phase diagram was established on the H-T plane and compared with that determined for Ni3V2O8. The both phase diagrams are described by a model of competing first and second neighbor interactions and uniaxial anisotropy with the easy-axis magnetization along the a-axis

  9. Structural, Optical and Electrochromic Properties of Sol–Gel V2O5Thin Films

    OpenAIRE

    E. L. Ameziane; Bennouna, A.; R. Jourdani; A. Outzourhit; Benmouss, M.

    2003-01-01

    Vanadium pentoxide thin films are prepared by the sol–gel route by dissolving V2O5 powder (99.5% purity) in H2O2 solution. The solution is spin-coated on glass substrates for optical (UV–VIS–NIR) and XRD analysis, and on ITOcoated glass substrates for electrochromic measurements. The samples are then annealed at 150°C for 1 hour. The resulting films have a yellow-orange color, typical of polycrystalline V2O5. XRD measurements have shown that after annealing in air at 400°C the structure of th...

  10. MoV2O8 nanostructures: controlled synthesis and lithium storage mechanism

    Science.gov (United States)

    Yin, Zhigang; Xiao, Ying; Wang, Xia; Wang, Wei; Zhao, Di; Cao, Minhua

    2015-12-01

    A facile two-step strategy involving a solvothermal method and a subsequent calcining treatment was successfully developed for the preparation of MoV2O8 nanorods in the absence of any surfactants. Acetic acid was chosen as the solvent to provide an acidic environment. The as-synthesized MoV2O8 nanorods were evaluated as an anode material in lithium ion batteries, which showed excellent lithium storage performance in terms of its specific capacity, rate performance, and cycling stability. It could deliver a specific capacity of over 1325 mA h g-1 after 50 cycles at 0.2 A g-1, which is much higher than that of bulk MoV2O8 (617 mA h g-1). When the cell was cycled at a current density as high as 10.0 A g-1, it still maintained a high specific capacity of around 570 mA h g-1. The phase transformation, intercalation-deintercalation and partial redox processes are responsible for the lithium storage mechanism of MoV2O8 based on ex situ X-ray diffraction, X-ray photo electron spectroscopy and transmission electron microscopy studies, highlighting a new lithium storage mechanism for ternary metal oxides.A facile two-step strategy involving a solvothermal method and a subsequent calcining treatment was successfully developed for the preparation of MoV2O8 nanorods in the absence of any surfactants. Acetic acid was chosen as the solvent to provide an acidic environment. The as-synthesized MoV2O8 nanorods were evaluated as an anode material in lithium ion batteries, which showed excellent lithium storage performance in terms of its specific capacity, rate performance, and cycling stability. It could deliver a specific capacity of over 1325 mA h g-1 after 50 cycles at 0.2 A g-1, which is much higher than that of bulk MoV2O8 (617 mA h g-1). When the cell was cycled at a current density as high as 10.0 A g-1, it still maintained a high specific capacity of around 570 mA h g-1. The phase transformation, intercalation-deintercalation and partial redox processes are responsible for

  11. Li2O(Na2O)-CoO-V2O5 systems

    International Nuclear Information System (INIS)

    Equilibrium phase composition of the systems: Li2O-CoO-V2O5 and Na2O-CoO-V2O5 at subsolidus temperatures has been studied. Formation of solid solution Li1-xCox/2VO3 (0≤ x ≤ 0.20) and binary orthovanadate LiCoVO4 in lithium-containing system is shown. No ternary compounds have been revealed in sodium-containing system. The relevant diagrams of phase ratios are plotted and their triangulation is performed. 18 refs

  12. The K2O-CaO-V2O5 system

    International Nuclear Information System (INIS)

    The phase composition of the K2O-CaO-V2O5 system in the subsolidus region is investigated. The proper phase equilibrium diagram is plotted. The formation in the system of two new compounds-binary pyrovanadate K2CaV v2O7 and binary orthovanadate K4Ca(VO4)2 has been found. The temperatures of peritectic melting of the salts are 680 and 1250 deg c, respectively. Some physico-chemical characteristics of binary potassium- and calcium vanadates are determined

  13. Pressure and doping driven metal-to-insulator transition in V2O3

    International Nuclear Information System (INIS)

    In the V2O3 system chemical doping and application of pressure are usually assumed to have equivalent effects for the physics of the Mott Hubbard metal-to-insulator transition (MIT). Recent experimental evidence, however, shows that application of pressure on the Cr-doped V2O3 cannot repristinate the situation of the undoped compound. In order to understand the underlying physical mechanisms in the differently driven MITs we investigate optical and X-ray absorption spectra by means of the local density approximation and its merger with dynamical mean field theory (LDA+DMFT) as well as full multiplet cluster calculations.

  14. Safety improvement of nuclear power plants with WWER-440 reactors type V-230

    International Nuclear Information System (INIS)

    Safety analysis was performed for the V-230 type WWER-440 un of the V-1 nuclear power plant at Jaslovske Bohunice in Czechoslovakia. As compared with the improved V-213 type, differences occur mainly in the automated control systems of technological processes and in the main circulation pumps. The Soviet 1986 recommendations for increasing the V-1 nuclear power plant safety are given. It is concluded that all aspects have to be taken into consideration when making decisions with respect t the reconstruction of the V-1 units. For instance, owing to the low investment costs the price of 1 MWh power generated at this plant is 100 CSC lower than at the V-2 nuclear power plant; and this favorable relation would be disturbed by in-depth reconstruction. Hence, the decisions to be made must take into account the plant operation economy, the technical state of the pressure devices as well as the out-of-dateness of the safety conception, which, however, may seem different today and in 5 to 10 years when the reconstruction will be accomplished. (Z.M.). 4 tabs., 1 ref

  15. Reactor building

    International Nuclear Information System (INIS)

    The whole reactor building is accommodated in a shaft and is sealed level with the earth's surface by a building ceiling, which provides protection against penetration due to external effects. The building ceiling is supported on walls of the reactor building, which line the shaft and transfer the vertical components of forces to the foundations. The thickness of the walls is designed to withstand horizontal pressure waves in the floor. The building ceiling has an opening above the reactor, which must be closed by cover plates. Operating equipment for the reactor can be situated above the building ceiling. (orig./HP)

  16. Heterogeneous reactors

    International Nuclear Information System (INIS)

    The microscopic study of a cell is meant for the determination of the infinite multiplication factor of the cell, which is given by the four factor formula: K(infinite) = n(epsilon)pf. The analysis of an homogeneous reactor is similar to that of an heterogeneous reactor, but each factor of the four factor formula can not be calculated by the formulas developed in the case of an homogeneous reactor. A great number of methods was developed for the calculation of heterogeneous reactors and some of them are discussed. (Author)

  17. Strong orbital fluctuations in multipolar ordered states of PrV2Al20

    Science.gov (United States)

    Matsumoto, Yosuke; Tsujimoto, Masaki; Tomita, Takahiro; Sakai, Akito; Nakatsuji, Satoru

    2016-02-01

    PrT2Al20 (T=Ti, V) are ideal systems to study the quadrupole Kondo effect and quantum criticality arising from orbital degrees of freedom. The both systems have the nonmagnetic cubic Γ3 crystal electric field ground doublet with the well separated excited state. In particular, PrV2Al20 exhibits anomalous metallic behavior above and below the multipolar ordering temperatures, reflecting the even stronger hybridization between f and conduction electrons possibly due to a proximity to an orbital quantum critical point. Here we report the anomalous metallic behaviors found in a pure single crystal of PrV2Al20. Our detailed analyses revealed that the resistivity indicates power law temperature dependence proportional to T3. Furthermore, we pointed out that the 4f electron contribution to the specific heat also exhibits power law behavior proportional to T4. Both observations are in a sharp contrast to the gapped behavior found in PrTi2Al20 and indicate the strong c-f hybridization and strong orbital fluctuations in PrV2Al20. In addition, the 4f electron contribution to the entropy in PrV2Al20 reaches only 50% of R ln 2 at an orbital ordering at T=0.75 K, suggesting another 50% of R ln 2 expected for Γ3 doublet is already released at higher temperature possibly due to quadrupole Kondo effect.

  18. Price-based Energy Control for V2G Networks in the Industrial Smart Grid

    Directory of Open Access Journals (Sweden)

    Rong Yu

    2015-08-01

    Full Text Available The energy crisis and global warming call for a new industrial revolution in production and distribution of renewable energy. Distributed power generation will be well developed in the new smart electricity distribution grid, in which robust power distribution will be the key technology. In this paper, we present a new vehicle-to-grid (V2G network for energy transfer, in which distributed renewable energy helps the power grid balance demand and supply. Plug-in hybrid electric vehicles (PHEVs will act as transporters of electricity for distributed renewable energy dispatching. We formulate and analyze the V2G network within the theoretical framework of complex network. We also employ the generalized synchronization method to study the dynamic behavior of V2G networks. Furthermore, we develop a new price-based energy control method to stimulate the PHEV's behavior of charging and discharging. Simulation results indicate that the V2G network can achieve synchronization and each region is able to balance energy supply and demand through price-based control.

  19. V2O5-Poly aniline Nano composite as Catalyst in Ozonization of Oleic Acid

    International Nuclear Information System (INIS)

    In this work, the synthesis of Azelaic acid (AA) from oleic acid cleavage is studied. The reaction is done by using V2O5- Poly aniline (pani) nano composite as catalyst in solvent free medium. Preparation of V2O5- pani nano composite as a catalyst is done via micelle solution by using cationic surfactant, cethyl trimethyl ammonium bromide (CTAB). Various loading percentages of V2O5 in Pani are considered and their differences in activity and selectivity are also evaluated. According to GC analysis, results showed that nano composite as catalyst is two times more selective to azelaic acid compare to bulk and nano V2O5. This nano composite has significant selectivity to azelaic acid rather than pelargonic acid , the by-product of oleic acid ozonolysis. For characterization TEM, FESEM, BET, XPS, TGA, XRD analysis are done .It is found that both yield and selectivity are increased when surface area, defects and specific active sites of catalyst are increased. (author)

  20. Correlation between the high temperature anomalies in V2O3 and the lattice parameters

    International Nuclear Information System (INIS)

    A single phase corundum type structure was observed in V2O3 from 165 to 1100 K. An anomalous behaviour of the lattice parameters of the rhombohedral unit cell was found in the high temperature region where V2O3 undergoes a broad electrical transition. The unit cell edge asub(R) contracts above 165 K, reaching a minimum at 533 K, after which there is a sharp increase. Above 595 K asub(R) expands continuously and then almost linearly above 775 K. The temperature dependence of the rhombohedral angle shows two distinct regions, and the volume expansion follows the variation of angle: the change of the rate of expansion coincides with the minimum of asub(R). The contraction of asub(R) corresponds to a reduction in certain second-neighbor V-V distances. The results show that a gradual transition is taking place in V2O3 from an α type structure to a β type characteristic of the Cr-doped V2O3 compounds. In addition, the sharp dip of the asub(R) curve occurs at nearly the same temperature as the peak previously observed in small angle scattering of neutrons. It is presumed that the two effects are related, and that the critical-like behaviour of asub(R) is due to some dynamic magnetoelastic effect involving second neighbor V-V interactions. (author)

  1. HSP v2: Haptic Signal Processing with Extensions for Physical Modeling

    DEFF Research Database (Denmark)

    Overholt, Daniel; Kontogeorgakopoulos, Alexandros; Berdahl, Edgar

    2010-01-01

    The Haptic Signal Processing (HSP) platform aims to enable musicians to easily design and perform with digital haptic musical instruments [1]. In this paper, we present some new objects introduced in version v2 for modeling of musical dynamical systems such as resonators and vibrating strings...

  2. Hydrogen photochromism in V2O5 layers prepared by the sol–gel technology

    International Nuclear Information System (INIS)

    Graphical abstract: - Highlights: • We prepared the V2O5 gel layer by the sol–gel technology to investigate the photochromism. • The comprehensive characterization of the gels was carried out with the help of different technique. • The photochromic sensitivity of the layers was enhanced with thickness. • The position of the arising absorption band in the spectral range was dependant on the concentration of inserted hydrogen atoms. - Abstract: Here we report on hydrogen photochromism in V2O5 highly disordered layers, i.e., photochromism that occurs due to hydrogen atoms; the hydrogen being detached under the action of light from organic molecules adsorbed on the oxide surface, whereas the V2O5 layers have been prepared by the sol–gel technology. The comprehensive characterization of the layers has been carried out, as well as the investigation of the parameters influencing their photochromic sensitivity. The high photochromic sensitivity of the V2O5 layers is provided by the surface Grotthuss diffusion of the injected protons

  3. 76 FR 2800 - Amendment of VOR Federal Airways V-2 and V-21; Hawaii

    Science.gov (United States)

    2011-01-18

    ... and Procedures (44 FR 11034; February 26, 1979); and (3) does not warrant preparation of a regulatory..., 40113, 40120; E.O. 10854, 24 FR 9565, 3 CFR, 1959-1963 Comp., p. 389. Sec. 71.1 0 2. The incorporation... TRANSPORTATION Federal Aviation Administration 14 CFR Part 71 Amendment of VOR Federal Airways V-2 and...

  4. Disorder effects in the S=1 antiferromagnetic spin ladder CaV2O4

    Science.gov (United States)

    Guitarra, S. R.; Caneiro, A.; Niebieskikwiat, D.

    2015-10-01

    We study the physical properties of the antiferromagnetic spin ladder CaV2O4 (CVO) and the Y-doped related compound Ca0.9Y0.1V2O4. In the latter, X-ray diffraction demonstrates the segregation of a small amount of a vanadium-perovskite impurity phase, leading to the formation of V vacancies within the main CVO-type structure. The 1D character of this calcium-vanadite enhances the influence of the vacancies on the electric and magnetic properties of Ca0.9Y0.1V2O4. Electrical transport is characterized by a variable-range hopping mechanism determined by the charging energy of nm-sized segments of V chains delimited by V vacancies, i.e. a Coulomb gap is formed at the Fermi level. These vacancies also locally affect the magnetic correlations, breaking the long-range AFM order observed in CaV2O4 and producing exchange bias when the Y-doped sample is cooled with an applied magnetic field.

  5. Automated Transportation Management System (ATMS) V2.0 logistics module PBI acceptance criteria

    International Nuclear Information System (INIS)

    This document defines the acceptance criteria for the Automated Transportation Management System V2.0 Logistics Module Performance Based Incentive (PBI). This acceptance criteria will be the primary basis for the generation of acceptance test procedures. The purpose of this document is to define the minimum criteria that must be fulfilled to guarantee acceptance of the Logistics Module

  6. MR_CHIROD v.2: magnetic resonance compatible smart hand rehabilitation device for brain imaging.

    Science.gov (United States)

    Khanicheh, Azadeh; Mintzopoulos, Dionyssios; Weinberg, Brian; Tzika, A Aria; Mavroidis, Constantinos

    2008-02-01

    This paper presents the design, fabrication, and testing of a novel, one degree-of-freedom, magnetic resonance compatible smart hand interfaced rehabilitation device (MR_CHIROD v.2), which may be used in brain magnetic resonance (MR) imaging during handgrip rehabilitation. A key feature of the device is the use of electrorheological fluids (ERFs) to achieve computer controlled, variable, and tunable resistive force generation. The device consists of three major subsystems: 1) an ERF based resistive element, 2) handles, and c) two sensors, one optical encoder and one force sensor, to measure the patient induced motion and force. MR_CHIROD v.2 is designed to resist up to 50% of the maximum level of gripping force of a human hand and be controlled in real time. Our results demonstrate that the MR environment does not interfere with the performance of the MR_CHIROD v.2, and, reciprocally, its use does not cause fMR image artifacts. The results are encouraging in jointly using MR_CHIROD v.2 and brain MR imaging to study motor performance and assess rehabilitation after neurological injuries such as stroke. PMID:18303810

  7. Impacts of Surface Energy on Lithium Ion Intercalation Properties of V2O5.

    Science.gov (United States)

    Ma, Wenda; Zhang, Changkun; Liu, Chaofeng; Nan, Xihui; Fu, Haoyu; Cao, Guozhong

    2016-08-01

    Oxygen vacancies have demonstrated to be one of the most effective ways to alter electrochemical performance of electrodes for lithium ion batteries, though there is little information how oxygen vacancies affect the electrochemical properties. Vanadium pentoxide (V2O5) cathode has been investigated to explore the relationship among oxygen vacancies, surface energy, and electrochemical properties. The hydrogen-treated V2O5 (H-V2O5) sample synthesized via thermal treatment under H2 atmosphere possesses a high surface energy (63 mJ m(-2)) as compared to that of pristine V2O5 (40 mJ m(-2)) and delivers a high reversible capacity of 273.4 mAh g(-1) at a current density of 50 mA g(-1), retaining 189.0 mAh g(-1) when the current density increases to 2 A g(-1). It also displays a capacity retention of 92% after 100 cycles at 150 mA g(-1). The presence of surface oxygen vacancies increases surface energy and possibly serves as a nucleation center to facilitate phase transition during lithium ion intercalation and deintercalation processes. PMID:27400230

  8. National High School Center Early Warning System Tool v2.0: Technical Manual

    Science.gov (United States)

    National High School Center, 2011

    2011-01-01

    The Early Warning System (EWS) Tool v2.0 is a Microsoft Excel-based tool developed by the National High School Center at the American Institutes for Research in collaboration with Matrix Knowledge Group. The tool enables schools, districts, and states to identify students who may be at risk of dropping out of high school and to monitor these…

  9. Two-dimensional V2O5 sheet network as electrode for lithium-ion batteries.

    Science.gov (United States)

    Xu, Yun; Dunwell, Marco; Fei, Ling; Fu, Engang; Lin, Qianglu; Patterson, Brian; Yuan, Bin; Deng, Shuguang; Andersen, Paul; Luo, Hongmei; Zou, Guifu

    2014-11-26

    Two-dimensional V2O5 and manganese-doped V2O5 sheet network were synthesized by a one-step polymer-assisted chemical solution method and characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, thermal-gravimetric analysis, and galvanostatic discharge-charge analysis. The V2O5 particles were covered with thin carbon layers, which remained after decomposition of the polymer, forming a network-like sheet structure. This V2O5 network exhibits a high capacity of about 300 and 600 mA·h/g at a current density of 100 mA/g when it was used as a cathode and anode, respectively. After doping with 5% molar ratio of manganese, the capacity of the cathode increases from 99 to 165 mA·h/g at a current density of 1 A/g (∼3 C). This unique network structure provides an interconnected transportation pathway for lithium ions. Improvement of electrochemical performance after doping manganese could be attributed to the enhancement of electronic conductivity. PMID:25369296

  10. Color-Space-Based Visual-MIMO for V2X Communication †

    Science.gov (United States)

    Kim, Jai-Eun; Kim, Ji-Won; Park, Youngil; Kim, Ki-Doo

    2016-01-01

    In this paper, we analyze the applicability of color-space-based, color-independent visual-MIMO for V2X. We aim to achieve a visual-MIMO scheme that can maintain the original color and brightness while performing seamless communication. We consider two scenarios of GCM based visual-MIMO for V2X. One is a multipath transmission using visual-MIMO networking and the other is multi-node V2X communication. In the scenario of multipath transmission, we analyze the channel capacity numerically and we illustrate the significance of networking information such as distance, reference color (symbol), and multiplexing-diversity mode transitions. In addition, in the V2X scenario of multiple access, we may achieve the simultaneous multiple access communication without node interferences by dividing the communication area using image processing. Finally, through numerical simulation, we show the superior SER performance of the visual-MIMO scheme compared with LED-PD communication and show the numerical result of the GCM based visual-MIMO channel capacity versus distance. PMID:27120603

  11. Dielectric anomaly in NaV2O5 : evidence for charge ordering

    NARCIS (Netherlands)

    Smirnov, A.I.; Popova, M.N.; Sushkov, A.B.; Golubchik, S.A.; Khomskii, D.I.; Mostovoy, M.V.; Vasil'ev, A.N.; Isobe, M.; Ueda, Y.

    2000-01-01

    We found a high-frequency dielectric and magnetic anomaly in NaV2O5 at the phase transition into the spin-gap state. The dielectric constant anomaly is of the antiferroelectric type, which is in agreement with the models assuming the zigzag charge ordering in the ab-plane.

  12. Robust Supersolidity in the V1- V2 Extended Bose-Hubbard Model

    Science.gov (United States)

    Greene, Nicole; Pixley, Jedediah

    2016-05-01

    Motivated by ultra-cold atomic gases with long-range interactions in an optical lattice we study the effects of the next-nearest neighbor interaction on the extended Bose-Hubbard model on a square lattice. Using the variational Gutzwiller approach with a four-site unit cell we determine the ground state phase diagrams as a function of the model parameters. We focus on the interplay of each interaction between the nearest neighbor (V1) , the next-nearest neighbor (V2) , and the onsite repulsion (U). We find various super-solid phases that can be described by one of the ordering wave-vectors (π, 0), (0, π) , and (π, π) . In the limits V1, V2 U we find phases reminiscent of the limit V2 = 0 but with a richer super solid structure. For V1 V2 we find a qualitatively new super solid phase that is quite stable and occupies a large region of the phase diagram. For sufficiently strong interactions we find various Mott and charge density wave (CDW) insulating phases that can be understood in the classical limit (i.e. no inter-site tunneling). We characterize the nature of each quantum phase transition between Mott/CDW to super-solid to superfluid at the mean field level.

  13. Plasma reactor

    OpenAIRE

    Molina Mansilla, Ricardo; Erra Serrabasa, Pilar; Bertrán Serra, Enric

    2008-01-01

    [EN] A plasma reactor that can operate in a wide pressure range, from vacuum and low pressures to atmospheric pressure and higher pressures. The plasma reactor is also able to regulate other important settings and can be used for processing a wide range of different samples, such as relatively large samples or samples with rough surfaces.

  14. Reactor physics

    International Nuclear Information System (INIS)

    Progress in research on reactor physics in 1997 at the Belgian Nuclear Research Centre SCK/CEN is described. Activities in the following four domains are discussed: core physics, ex-core neutron transport, experiments in Materials Testing Reactors, international benchmarks

  15. The influence of normal stress anisotropy in predicting scalar dispersion with the v2-f model

    International Nuclear Information System (INIS)

    Highlights: → Capturing flow anisotropy key to predicting scalar dispersion from localized sources. → Boussinesq approximation and a scalar turbulent diffusivity limit dispersion prediction potential. → Anisotropy information from the v2-f model incorporated with algebraic scalar flux models. → Predictions of three-component turbulent scalar flux comparable to second moment closure approach. - Abstract: A numerical study of scalar dispersion is presented to investigate the effectiveness of pairing the v2-f turbulence model with algebraic models for the scalar flux. This approach is contrasted with utilizing a full Second Moment Closure (SMC) as the flow field input to the scalar model. Predictions of scalar transport in a turbulent channel and over a wavy wall are compared to available DNS databases. The latter case includes a scalar release from a point source and therefore detailed comparisons of the three-component turbulent scalar flux are reported. It is found that the transported variable v2, representing the near wall turbulent velocity fluctuation scale, can be used to increase the level of normal stress anisotropy provided to algebraic scalar models and thereby improve mean scalar prediction over that of the Standard Gradient Diffusion Hypothesis (SGDH). Improvement is most significant in the near wall region. Three specifications of the normal stresses, derived from v2, are considered to provide the link from the v2-f model to the algebraic flux models used to close the scalar transport equation. Barycentric maps are used to examine the state of turbulence anisotropy in each case. As the anisotropy in the normal stress specification becomes more accurate, improvements are realized in the prediction of the spanwise flux as well as the mean concentration.

  16. PISCES-v2: an ocean biogeochemical model for carbon and ecosystem studies

    Directory of Open Access Journals (Sweden)

    O. Aumont

    2015-08-01

    of marine ecosystems (phytoplankton, microzooplankton and mesozooplankton and the biogeochemical cycles of carbon and of the main nutrients (P, N, Fe, and Si. The model is intended to be used for both regional and global configurations at high or low spatial resolutions as well as for short-term (seasonal, interannual and long-term (climate change, paleoceanography analyses. There are 24 prognostic variables (tracers including two phytoplankton compartments (diatoms and nanophytoplankton, two zooplankton size classes (microzooplankton and mesozooplankton and a description of the carbonate chemistry. Formulations in PISCES-v2 are based on a mixed Monod–quota formalism. On the one hand, stoichiometry of C / N / P is fixed and growth rate of phytoplankton is limited by the external availability in N, P and Si. On the other hand, the iron and silicon quotas are variable and the growth rate of phytoplankton is limited by the internal availability in Fe. Various parameterizations can be activated in PISCES-v2, setting, for instance, the complexity of iron chemistry or the description of particulate organic materials. So far, PISCES-v2 has been coupled to the Nucleus for European Modelling of the Ocean (NEMO and Regional Ocean Modeling System (ROMS systems. A full description of PISCES-v2 and of its optional functionalities is provided here. The results of a quasi-steady-state simulation are presented and evaluated against diverse observational and satellite-derived data. Finally, some of the new functionalities of PISCES-v2 are tested in a series of sensitivity experiments.

  17. Structure and transport properties of the electronically correlated thiospinel CuV2S4

    International Nuclear Information System (INIS)

    This work deals with the single crystal growth and the characterization of crystallographic, magnetic and mainly electronic transport properties of the metallic thiospinel CuV2S4, which is isostructural and isoelectronic to the heavy fermion system LiV2O4. Former reports of an enhanced Sommerfeld-coefficient of the specific heat indicated that electronic correlations are present in CuV2S4 as well. Additionally CuV2S4 shows a phase transition at 90 K, which has been associated with the formation of a charge density wave (CDW), whose propagation vector changes its length at two additional phase transitions close to 75 K and 55 K. The formation of a CDW is a typical low dimensional order phenomenon and very unusual for a three dimensional system with a cubic crystal symmetry in the high temperature phase. An additional motivation for the efforts to grow single crystals of this compound was a sample dependency which seemed to correlate with the type of transport agent (iodine or chlorine) used in the chemical transport reaction as the preferred preparation procedure for the single crystal growth. Due to the direct comparison of single crystals grown by both types of transport agents it could be shown that a very low concentration of chlorine is the origin for the almost complete suppression of the phase transitions in the corresponding type of single crystals. The strong sensitivity of the CDW-formation to disorder is also reflected by the huge increase of the residual resistivity ratio of more than one order of magnitude which could only be achieved by annealing procedures in the case of single crystals grown with iodine as transport agent. The high quality of the samples allowed for the first time to detect all three phase transition signatures in resistivity measurements. Their almost identical temperature dependence as a function of external hydrostatic pressure emphasizes their common physical origin. The coefficient of the T2 behavior of the electrical

  18. Nanostructure, thermoelectric properties, and transport theory of V2VI3 and V2VI3/IV-VI based superlattices and nanomaterials

    International Nuclear Information System (INIS)

    The scope of this work is to review the thermoelectric properties, the microstructures, and their correlation with theoretical calculations and predictions for recent chalcogenide based materials. The main focus is put on thin multilayered Bi2Te3, Sb2Te3 films, and bulk V2VI3/IV-VI mixed systems. For all films a systematic characterization of the thermoelectric properties as well as the micro- and nanostructure was performed. The degree of crystallinity of the multilayered films varied from epitaxial systems to polycrystalline films. Other multilayered thin films revealed promising thermoelectric properties. (SnSe)1.2TiSe2 thin films with rotational disorder yielded the highest Seebeck coefficient published to date for analogous materials. For bulk V2VI3/IV-VI mixed systems insides are given into a complete ''material to module'' process resulting in a high performance thermoelectric generator using (1-x)(GeTe) x(Bi2Se0.2Te2.8) (x = 0.038). Cyclic heating of this system with x = 0.063 resulted in a drastic change of the micro- and nanostructure observed by ex situ and in situ X-ray diffraction (XRD) and transmission electron microscopy (TEM). Consequently a degradation of ZT at 450 C from ∝2.0 to ∝1.0 was observed, while samples with x = 0.038 showed a stable ZT of 1.5. (copyright 2016 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  19. Compact Reactor

    International Nuclear Information System (INIS)

    Weyl's Gauge Principle of 1929 has been used to establish Weyl's Quantum Principle (WQP) that requires that the Weyl scale factor should be unity. It has been shown that the WQP requires the following: quantum mechanics must be used to determine system states; the electrostatic potential must be non-singular and quantified; interactions between particles with different electric charges (i.e. electron and proton) do not obey Newton's Third Law at sub-nuclear separations, and nuclear particles may be much different than expected using the standard model. The above WQP requirements lead to a potential fusion reactor wherein deuterium nuclei are preferentially fused into helium nuclei. Because the deuterium nuclei are preferentially fused into helium nuclei at temperatures and energies lower than specified by the standard model there is no harmful radiation as a byproduct of this fusion process. Therefore, a reactor using this reaction does not need any shielding to contain such radiation. The energy released from each reaction and the absence of shielding makes the deuterium-plus-deuterium-to-helium (DDH) reactor very compact when compared to other reactors, both fission and fusion types. Moreover, the potential energy output per reactor weight and the absence of harmful radiation makes the DDH reactor an ideal candidate for space power. The logic is summarized by which the WQP requires the above conditions that make the prediction of DDH possible. The details of the DDH reaction will be presented along with the specifics of why the DDH reactor may be made to cause two deuterium nuclei to preferentially fuse to a helium nucleus. The presentation will also indicate the calculations needed to predict the reactor temperature as a function of fuel loading, reactor size, and desired output and will include the progress achieved to date

  20. Crystal structure investigation of the barium vanadyl-vanadate: Ba2(VO)V2O8

    International Nuclear Information System (INIS)

    Single crystals of Ba2(VO)V2O8 have been prepared by solid state reactions of Ba2V2O7, V2O3 and V2O5 in sealed silica tubes. This compound crystallizes with monoclinic symmetry, space group C22-P21, a 8.1174(9), b = 5.9699(9), c = 9.2903(9) A, β = 113.94(1) , Z = 2. V5+ shows tetrahedral coordination. V4+ inside 1∞[V(3)O4] chains is characterized by a square pyramidal coordination with a short apical V-O distance of 1.6 A typically for vanadyl groups. Ba2(VO)V2O8 represents a new structure type and is not isotypic to Sr2(VO)V2O8. (orig.)

  1. Growth and characterization of V2O5 nanorods deposited by spray pyrolysis at low temperatures

    Science.gov (United States)

    Abd-Alghafour, N. M.; Ahmed, Naser M.; Hassan, Zai.; Mohammad, Sabah M.; Bououdina, M.

    2016-07-01

    Vanadium pentoxide (V2O5) nanorods were deposited by spray pyrolysis on preheated glass substrates at low temperatures. The influence of substrate temperature on the crystallization of V2O5 has been investigated. X-ray diffraction analysis (XRD) revealed that the films deposited at Tsub = 300°C were orthorhombic structures with preferential along (001) direction. Formation of nanorods from substrate surface which led to the formation of films with small-sized and rod-shaped nanostructure is observed by field scanning electron microscopy. Optical transmittance in the visible range increases to reach a maximum value of about 80% for a substrate temperature of 350°C. PL spectra reveal one main broad peak centered around 540 nm with high intensity.

  2. Elliptic Anisotropy $v_2$ May Be Dominated by Particle Escape instead of Hydrodynamic Flow

    CERN Document Server

    Lin, Zi-Wei; Edmonds, Terrence; Liu, Feng; Molnar, Denes; Wang, Fuqiang

    2015-01-01

    It is commonly believed that azimuthal anisotropies in relativistic heavy ion collisions are generated by hydrodynamic evolution of the strongly interacting quark-gluon plasma. Here we use transport models to study how azimuthal anisotropies depend on the number of collisions that each parton suffers. We find that the majority of $v_2$ comes from the anisotropic escape of partons, not from the parton collective flow, for semi-central Au+Au collisions at 200A GeV. As expected, the fraction of $v_2$ from the anisotropic particle escape is even higher for smaller systems such as d+Au. Our transport model results also confirm that azimuthal anisotropies would be dominated by hydrodynamic flow at unrealistically-high parton cross sections. Our finding thus naturally explains the similarity of azimuthal anisotropies in small and large systems; however, it presents a challenge to the paradigm of anisotropic flow.

  3. Large diamagnetic susceptibility from petit Fermi surfaces in LaV2Al20

    International Nuclear Information System (INIS)

    The large diamagnetic susceptibility of LaV2Al20 is studied by magnetization and de Haas–van Alphen (dHvA) oscillation measurements on single crystals as well as by Ti-for-V substitution (hole doping) experiments. Its origin is ascribed to a tiny holelike Fermi surface (FS) with a low Fermi temperature of 140 K and a small dHvA frequency of 19 T. The FS has a characteristic anisotropy that is approximated by six spheroidal hole pockets elongated along the cubic <001> directions with a minimum effective mass of 0.067 times the free electron mass. This characteristic FS can generate an unusually large Landau–Peierls diamagnetic susceptibility as observed experimentally in LaV2Al20. (author)

  4. The Mont Blanc mystery solved? A $m^2=-0.28 keV^2$ neutrino

    CERN Document Server

    Ehrlich, Robert

    2016-01-01

    Evidence is presented in support of a hypothesis made in 2013 predicting the existence of a tachyonic neutrino mass eigenstate doublet having $m^2\\approx -0.2 keV^2$ with $\\Delta m^2=1 eV^2.$ The evidence is based primarily on the puzzling LSD (Mont Blanc) neutrino burst observed on February 23, 1987, which the hypothesis thoroughly explains, with additional support from the Kamiokande-II events recorded on the same day. The probability of the null hypothesis, i.e., that background fluctuations can explain the noted features of the two data sets is estimated to be $4.2\\sigma$ (Mont Blanc), and $3.7\\sigma$ (K-II). Such a controversial hypothesis as a tachyonic neutrino requires absolutely definitive proof, and there may exist a test based on observing the neutrino spectrum from diffuse supernovae that could supply it.

  5. Fuel Economy Improvement Potential of a Heavy Duty Truck using V2x Communication

    Energy Technology Data Exchange (ETDEWEB)

    LaClair, Tim J [ORNL; Verma, Rajeev [Eaton Corporation; Norris, Sarah [Eaton Corporation; Cochran, Robert [Eaton Corporation

    2014-01-01

    In this paper, we introduce an intelligent driver assistance system to reduce fuel consumption in heavy duty vehicles irrespective of the driving style of the driver. We specifically study the potential of V2I and V2V communications to reduce fuel consumption in heavy duty trucks. Most ITS communications today are oriented towards vehicle safety, with communications strategies and hardware that tend to focus on low latency. This has resulted in technologies emerging with a relatively limited range for the communications. For fuel economy, it is expected that most benefits will be derived with greater communications distances, at the scale of many hundred meters or several kilometers, due to the large inertia of heavy duty vehicles. It may therefore be necessary to employ different communications strategies for ITS applications aimed at fuel economy and other environmental benefits than what is used for safety applications in order to achieve the greatest benefits.

  6. Observation of a new incommensurate phase in the spinel MnV2 O4

    Science.gov (United States)

    de La Pena Munoz, Gilberto; Lee, Sangjun; Gleason, Samuel; Byrum, Taylor; Fang, Xinyue; Weng, Shih-Chang; Abbamonte, Peter

    Using x-ray scattering, we studied the temperature dependence of a large volume of reciprocal space in a MnV2O4 spinel crystal. In addition to the known cubic to tetragonal phase transition at around 56 K, we observed previously unreported incommensurate modulation peaks at delta q = 0.33 0.33 -0.16. We measured the temperature dependence of these modulations and, while they exhibit a shift or splitting in momentum space analogous to that of the structural phase transition, they do so at higher temperature than the Bragg reflections (100K). Our results suggest that MnV2O4 has an additional phase transition that may a precursor for the V t2g orbital ordering, which is closely related to the cubic to tetragonal transition. This work was supported by the DOE Grant No. DE-FG02-06ER46285.

  7. Magnetic and dielectric properties of Mn2V2O7

    Science.gov (United States)

    Sannigrahi, J.; Giri, S.; Majumdar, S.

    2016-02-01

    The magnetic and dielectric properties of the manganese di-vanadate compound Mn2V2O7 are reported. The sample shows martensitic type structural transition close to room temperature which is evident both in the magnetic and dielectric data. Mn2V2O7 shows signature of antiferromagnetic type ordering around 17 K with concomitant anomaly in the dielectric properties at the same point, although no spontaneous electric polarization was found below 17 K. This clearly signifies a magnetic order driven electric anomaly and possibly it is antiferroelectric type with no net polarization. The dielectric relaxation behaviours show marked difference across the structural transition close to room temperature. Interestingly, the sample shows reversible switching behaviour across the structural transition close to 300 K between high and low dielectric states which can have important practical applications.

  8. Design Approach for Vehicle To Vehicle (V2V Dissemination of Messages in Vehicular Adhoc Network

    Directory of Open Access Journals (Sweden)

    Amita Meshram

    2014-07-01

    Full Text Available Designing a protocol structure which contains the control system, VANET device and the type of communication message structures which will implement the message packets for v2v or v2I infrastructure . The different message packets contain the information required to transfer from one node to another in vehicular network for communication. Design various algorithm required for Control, Alert and Infotainment messages. Time stamping lowering data rate efficient packet delivery and proper communication of required messages. Implementation of proposed algorithms and comparison of them with existing algorithms and study of different factors affecting the working of theses algorithms. Analysis of proposed design approach and improvements in results if required. Keywords -

  9. Prediction of meteor shower of comet 161P/2004 V2

    Science.gov (United States)

    Tomko, D.; Neslušan, L.

    2014-07-01

    We deal with theoretical meteoroid stream of Halley-type comet 161P/2004 V2. For two perihelion passages in the far past, we model the stream and follow its dynamical evolution until the present. We predict the characteristics of potential meteor showers according to the dynamical properties of artificial particles currently approaching the orbit of the Earth. Our dynamical study reveals that the comet 161P/2004 V2 could have an associated Earth-observable meteor shower, although no significant number of artificial particles are identified with real, photographic, video, or radar meteors. However, the mean radiant of the shower is predicted on the southern sky (its declination is about -23 grad) where a relatively low number of real meteors has been detected and, therefore, recorded in the databases used. The shower of 161P has a compact radiant area and a relatively large geocentric velocity of ~ 53 km/s.

  10. A microscopic view on the Mott transition in chromium-doped V(2)O(3).

    Science.gov (United States)

    Lupi, S; Baldassarre, L; Mansart, B; Perucchi, A; Barinov, A; Dudin, P; Papalazarou, E; Rodolakis, F; Rueff, J-P; Itié, J-P; Ravy, S; Nicoletti, D; Postorino, P; Hansmann, P; Parragh, N; Toschi, A; Saha-Dasgupta, T; Andersen, O K; Sangiovanni, G; Held, K; Marsi, M

    2010-01-01

    V(2)O(3) is the prototype system for the Mott transition, one of the most fundamental phenomena of electronic correlation. Temperature, doping or pressure induce a metal-to-insulator transition (MIT) between a paramagnetic metal (PM) and a paramagnetic insulator. This or related MITs have a high technological potential, among others, for intelligent windows and field effect transistors. However the spatial scale on which such transitions develop is not known in spite of their importance for research and applications. Here we unveil for the first time the MIT in Cr-doped V(2)O(3) with submicron lateral resolution: with decreasing temperature, microscopic domains become metallic and coexist with an insulating background. This explains why the associated PM phase is actually a poor metal. The phase separation can be associated with a thermodynamic instability near the transition. This instability is reduced by pressure, that promotes a genuine Mott transition to an eventually homogeneous metallic state. PMID:21045823

  11. Electrochromic performance of sol-gel deposited V2O5:Ta films

    International Nuclear Information System (INIS)

    Vanadium and tantalum-doped vanadium pentoxide, V2O5 and V2O5:Ta thin films (2.5 and 5 mol% of Ta) were prepared using sol-gel dip coating technique. The coating solutions were prepared by reacting vanadium (V) oxytripropoxide and tantalum ethoxide (V) as precursors using anhydrous isopropyl alcohol as solvent. The films were deposited on a transparent glass substrate with ITO conducting film by dip coating technique, with a withdrawal of 20 cm/min from the vanadium-tantalum solution and thermally treated at 300 deg. C for 1 h. The resulting films were characterized by cyclic voltammetry, optical spectroscopy and by X-ray diffraction analysis (XRD). The morphology of the films were studied by atomic force microscopy (AFM). The feasibility for use of these electrodes as ion storage for electrochromic devices was investigated

  12. FIRST EXPERIENCES WITH KINECT V2 SENSOR FOR CLOSE RANGE 3D MODELLING

    Directory of Open Access Journals (Sweden)

    E. Lachat

    2015-02-01

    Full Text Available RGB-D cameras, also known as range imaging cameras, are a recent generation of sensors. As they are suitable for measuring distances to objects at high frame rate, such sensors are increasingly used for 3D acquisitions, and more generally for applications in robotics or computer vision. This kind of sensors became popular especially since the Kinect v1 (Microsoft arrived on the market in November 2010. In July 2014, Windows has released a new sensor, the Kinect for Windows v2 sensor, based on another technology as its first device. However, due to its initial development for video games, the quality assessment of this new device for 3D modelling represents a major investigation axis. In this paper first experiences with Kinect v2 sensor are related, and the ability of close range 3D modelling is investigated. For this purpose, error sources on output data as well as a calibration approach are presented.

  13. On the phase composition of BaO-V2O5 system

    International Nuclear Information System (INIS)

    Ba3V4O13(1) and new vanadate Ba4V2O9(2) are synthesized from BaO and Ba3V2O8 at 700 deg C during 80 hs. Compound 1 is crystallized in monoclinic syngony, elementary cell parameters are as follows: a=15.073±0.015, b=8.94±0.009, c=10.16±0.01 A; β=103.495±0.014 deg. Vanadate 2 is crystallized in tetragonal syngony with the following cell parameters: a=18.75±0.01; c=18.09±0.01 A. At 800-1000 deg C vanadate 2 reacts with the air carbon dioxide with formation of carbonate and orthovanadate. IR spectra and roentgenographic properties of the prepared compounds are studied

  14. CGC/saturation approach for high energy soft interactions: v2 in proton-proton collisions

    Science.gov (United States)

    Gotsman, E.; Levin, E.; Maor, U.; Tapia, S.

    2016-04-01

    In this paper we continue our program to construct a model for high energy soft interactions, based on the CGC/saturation approach. We demonstrate that in our model, which describes diffractive physics as well as multiparticle production at high energy, the density variation mechanism leads to the value of v2 , which is about 60%-70% of the measured v2 . Bearing in mind that in the CGC/saturation approach there are two other mechanisms present, Bose enhancement in the wave function and local anisotropy, we believe that the azimuthal long range rapidity correlations in proton-proton collisions stem from the CGC/saturation physics, and not from quark-gluon plasma production.

  15. Photoconductivity in nanostructured sulfur-doped V2O5 thin films

    Science.gov (United States)

    Mousavi, M.; Yazdi, Sh. Tabatabai

    2016-03-01

    In this paper, S-doped vanadium oxide thin films with doping levels up to 40 at.% are prepared via spray pyrolysis method on glass substrates, and the effect of S-doping on the structural and photoconductivity related properties of β-V2O5 thin films is studied. The results show that most of the films have been grown in the tetragonal β-V2O5 phase structure with the preferred orientation along [200]. With increasing the doping level, the samples tend to be amorphous. The structure of the samples reveals to be nanobelt-shaped whose width decreases from nearly 100 nm to 40 nm with S concentration. The photoconductivity measurements show that by increasing the S-doping level, the photosensitivity increases, which is due to the prolonged electron’s lifetime as a result of enhanced defect states acting as trap levels.

  16. Fabrication and Li+-intercalation properties of V2O5-TiO2 composite nanorod arrays

    International Nuclear Information System (INIS)

    A capillary-enforced template-based method has been applied to fabricate V2O5-TiO2 composite nanorod arrays via filling mixture of VOSO4 and TiOSO4 solutions into the pores of polycarbonate membrane. For comparison purposes, pure V2O5 nanorod arrays were prepared through the similar template-based method with V2O5 sol and the sol was synthesized through the V2O5-H2O2 route. The nanorods covered completely a large area and projected from the surface of ITO substrate. The addition of TiO2 to V2O5 has demonstrated to greatly affect the Li+ intercalation capacity of V2O5. For example, V2O5-TiO2 nanorod array with molar ratio V/Ti=75/25 delivered 1.5 times discharge capacity of V2O5 nanorods at a current density of 92 mA/g. Such improvement in the intercalation properties was ascribed to the change of crystallinity and possible modification in lattice structure and interaction forces between adjacent layers in V2O5. (orig.)

  17. Rattling-enhanced superconductivity in M V2A l20(M =Sc ,Lu ,Y ) intermetallic cage compounds

    Science.gov (United States)

    Winiarski, M. J.; Wiendlocha, B.; Sternik, M.; Wiśniewski, P.; O'Brien, J. R.; Kaczorowski, D.; Klimczuk, T.

    2016-04-01

    Polycrystalline samples of four intermetallic compounds: M V2A l20 (M =Sc , Y, La, and Lu) were synthesized using an arc-melting technique. The crystal structures were analyzed by means of powder x-ray diffraction and Rietveld analysis, and the physical properties were studied by means of heat capacity, electrical resistivity, and magnetic susceptibility measurements down to 0.4 K. For Sc V2A l20 , Lu V2A l20 , and Y V2A l20 , superconductivity was observed with critical temperatures Tc=1.00 , 0.57, and 0.60 K, respectively. Superconductivity for the Lu compound is reported. Theoretical calculations of the electronic and phonon structures were conducted in order to analyze the superconductivity and dynamics in Sc V2A l20 , Y V2A l20 , and Lu V2A l20 and to explain the lack of a superconducting transition in La V2A l20 down to 0.4 K. The results of the experimental and theoretical studies show that all the compounds are weakly coupled type-II BCS superconductors, and reveal the importance of the M -atom anharmonic "rattling" modes for the superconductivity in these materials, which seem to enhance Tc, especially for Sc V2A l20 .

  18. Structures of HIV-1-Env V1V2 with broadly neutralizing antibodies reveal commonalities that enable vaccine design

    OpenAIRE

    Gorman, Jason; Soto, Cinque; Yang, Max M.; Davenport, Thaddeus M.; Guttman, Miklos; Robert T Bailer; Chambers, Michael; Chuang, Gwo-Yu; DeKosky, Brandon J.; Doria-Rose, Nicole A.; Druz, Aliaksandr; Ernandes, Michael J.; Georgiev, Ivelin S.; Jarosinski, Marissa C.; Joyce, M. Gordon

    2015-01-01

    Broadly neutralizing antibodies (bNAbs) against HIV-1-Env V1V2 arise in multiple donors. However, atomic-level interactions had only been determined with antibodies from a single donor, making commonalities in recognition uncertain. Here we report the co-crystal structure of V1V2 with antibody CH03 from a second donor and model Env interactions of antibody CAP256-VRC26 from a third. These V1V2-directed bNAbs utilized strand-strand interactions between a protruding antibody loop and a V1V2 str...

  19. G2V and V2G operation 20 kW battery charger

    OpenAIRE

    Escoda, Jordi; Fontanilles, Joan; Biel Solé, Domingo; Repecho del Corral, Víctor; Cardoner Parpal, Rafel; Griñó Cubero, Robert

    2013-01-01

    This paper presents a bidirectional on-board battery charger for Electric Vehicles designed to perform both Grid to Vehicle (G2V) and Vehicle to Grid (V2G) operation. The charger can also operate with single or three-phase power grid connection, regulates the battery charging current and presents input unity power factor. A high frequency three-phase transformer has been included in the charger, this providing galvanic isolation.

  20. Economic Feasibility of V2G Frequency Regulation in Consideration of Battery Wear

    OpenAIRE

    Sekyung Han; Soohee Han

    2013-01-01

    An economic feasibility study of vehicle-to-grid (V2G) frequency regulation is performed in consideration of battery wear. Usually, a transaction for frequency regulation is made in terms of power capacity while the battery-wear proceeds in proportion to the absolute amount of energy transferred. In order to relate the two quantities, we first estimate the amount of transferred energy in terms of contracted power capacity, and hence regulation income, by analyzing actual regulation signals an...

  1. Lattice parameter anomalies in V2O3 at high temperature

    International Nuclear Information System (INIS)

    The rhombohedral lattice parameters of pure V2O3 show anomalous behaviour in the high temperature region. The change in the rate of expansion of the rhombohedral angle αsub(R) occurs at 533 K where the lattice constant asub(R) reaches a minimum. The sharp dip at 533 K in the asub(R) curve can be correlated with the peak observed in recent small angle scattering of neutrons and might be due to some dynamic magnetoelastic effect. (author)

  2. The first disease connection for Ca(v)2.2 channels

    Czech Academy of Sciences Publication Activity Database

    Weiss, Norbert

    2015-01-01

    Roč. 34, č. 3 (2015), s. 217-219. ISSN 0231-5882 R&D Projects: GA ČR GA15-13556S; GA MŠk 7AMB15FR015 Institutional support: RVO:61388963 Keywords : calcium channel * Ca(v)2.2 channel * channelopathies * myoclonus-dystonia syndrome Subject RIV: CE - Biochemistry Impact factor: 1.173, year: 2014

  3. Thaksinomics: A New Asian Paradigm; Strategic Insights: v.2, issue 12 (December 2003)

    OpenAIRE

    Looney, Robert

    2003-01-01

    This article appeared in Strategic Insights (December 2003), v.2 no.12 Prior to the Asian Economic Crisis sparked by the collapse of the Thai baht in 1997, Southeast Asia looked like a sure bet for a long period of high sustained economic growth. As a region, Southeast Asia's economies are the most open to international trade. While such openness spurred their growth for several decades, in the post 1997 period it has left them increasingly vulnerable to adverse economic and political sh...

  4. Record low temperature Mo doped V2O5 thermochromic thin films for optoelectronic applications

    OpenAIRE

    M. Nazemiyan; Y. S. Jalili

    2013-01-01

    Thermochromic properties of polycrystalline molybdenum doped vanadium pentoxide thin films grown by the spray pyrolysis technique were investigated. Tetragonal thin film structures of this system are grown. The transmittance spectral analysis with temperature indicates a record semiconductor-metal transition temperature of < 50oC. This critical temperature is approximately 1/3 to 1/6 of magnitude expected for V2O5 thin films. The resistance of the thermochromic thin film also underwent a tran...

  5. Rescue of vasopressin V2 receptor mutants by chemical chaperones: specificity and mechanism.

    OpenAIRE

    Robben, J.H.; Sze, M.; Knoers, N.V.A.M.; Deen, P. M. T.

    2006-01-01

    Because missense mutations in genetic diseases of membrane proteins often result in endoplasmic reticulum (ER) retention of functional proteins, drug-induced rescue of their cell surface expression and understanding the underlying mechanism are of clinical value. To study this, we tested chemical chaperones and sarco(endo)plasmic reticulum Ca2+ ATPase pump inhibitors on Madin-Darby canine kidney cells expressing nine ER-retained vasopressin type-2 receptor (V2R) mutants involved in nephrogeni...

  6. Investigation on V2O5 recovery from spent vanadium catalysts

    International Nuclear Information System (INIS)

    Possibilities of utilization of the spent vanadium catalysts, and especially of recovery of its most expensive component - V2O5, have been investigated. Two methods have been tested; one consisting in sintering the catalyst with appropriate fluxes with subsequent leaching the sinter with water to liberate the vanadium compounds and alternatively a method in which the vanadium compounds were leached from the catalyst with a sodium hydroxide solution with and without the addition of an oxidizing agent. (author). 5 refs, 2 tabs

  7. Surface reactivity of V2O5(001): Effects of vacancies, protonation, hydroxylation, and chlorination

    Science.gov (United States)

    Negreira, Ana Suarez; Aboud, Shela; Wilcox, Jennifer

    2011-01-01

    Using density-functional theory we analyze the thermodynamic stability of partially reduced, protonated, hydroxylated, and chlorinated V2O5(001) surfaces under flue gas conditions. These surfaces are characterized geometrically through surface relaxation calculations and electronically through charge distribution and density-of-states analysis to understand the change in surface reactivity under different pressure and temperature conditions, with a primary focus on coal-fired flue gas conditions. The stoichiometric surface is found to be the most favorable termination under flue gas conditions, but at low oxygen partial pressures (i.e., ultra-high-vacuum conditions) and elevated temperatures, the partially reduced V2O5(001) surfaces with one or two vanadyl oxygen vacancies are found to be stable. A surface semiconductor-to-metal transformation takes place with the addition of oxygen vacancies indicated by a decrease in the band gap. The protonation of the V2O5(001) surface only takes place at low oxygen partial pressures where the main source or sink of hydrogen atoms comes from H2. The study of the thermodynamic stability of protonated surfaces and surfaces with dissociated water with both H- and OH- groups indicated that these surfaces are not stable under flue gas conditions. Chlorinated surfaces were not stable under the flue gas and the coverage conditions tested. Larger HCl concentrations or smaller coverages may lead to stable chlorinated structures; however, the small coverages required to accurately represent the chlorine flue gas concentrations would require much larger unit-cell sizes that would be too computationally expensive. From this work it is evident that the stoichiometric surface of V2O5 is the most stable under flue gas conditions, and likely reactivity corresponding to NOx reduction, surface chlorination, and mercury oxidation stems from support effects on the vanadia catalyst, which influences the vanadium oxidation state and subsequent

  8. A Microscopic View on the Mott transition in Chromium-doped V2O3

    OpenAIRE

    Lupi, S.; Baldassarre, L.; Mansart, B.; Perucchi, A.; Barinov, A.; Dudin, P.; Papalazarou, E.; Rodolakis, F.; Rueff, J. -P.; Itié, J.-P.; Ravy, S.; Nicoletti, D.; Postorino, P.; Hansmann, P.; Parragh, N.

    2010-01-01

    V2O3 is the prototype system for the Mott transition, one of the most fundamental phenomena of electronic correlation. Temperature, doping or pressure induce a metal to insulator transition (MIT) between a paramagnetic metal (PM) and a paramagnetic insulator (PI). This or related MITs have a high technological potential, among others for intelligent windows and field effect transistors. However the spatial scale on which such transitions develop is not known in spite of their importance for r...

  9. CREST v2.1 Refined by a Distributed Linear Reservoir Routing Scheme

    Science.gov (United States)

    Shen, X.; Hong, Y.; Zhang, K.; Hao, Z.; Wang, D.

    2014-12-01

    Hydrologic modeling is important in water resources management, and flooding disaster warning and management. Routing scheme is among the most important components of a hydrologic model. In this study, we replace the lumped LRR (linear reservoir routing) scheme used in previous versions of the distributed hydrological model, CREST (coupled routing and excess storage) by a newly proposed distributed LRR method, which is theoretically more suitable for distributed hydrological models. Consequently, we have effectively solved the problems of: 1) low values of channel flow in daily simulation, 2) discontinuous flow value along the river network during flood events and 3) irrational model parameters. The CREST model equipped with both the routing schemes have been tested in the Gan River basin. The distributed LRR scheme has been confirmed to outperform the lumped counterpart by two comparisons, hydrograph validation and visual speculation of the continuity of stream flow along the river: 1) The CREST v2.1 (version 2.1) with the implementation of the distributed LRR achieved excellent result of [NSCE(Nash coefficient), CC (correlation coefficient), bias] =[0.897, 0.947 -1.57%] while the original CREST v2.0 produced only negative NSCE, close to zero CC and large bias. 2) CREST v2.1 produced more naturally smooth river flow pattern along the river network while v2.0 simulated bumping and discontinuous discharge along the mainstream. Moreover, we further observe that by using the distributed LRR method, 1) all model parameters fell within their reasonable region after an automatic optimization; 2) CREST forced by satellite-based precipitation and PET products produces a reasonably well result, i.e., (NSCE, CC, bias) = (0.756, 0.871, -0.669%) in the case study, although there is still room to improve regarding their low spatial resolution and underestimation of the heavy rainfall events in the satellite products.

  10. Birth and death of quasiparticles in the Mott-Hubbard prototype V2O3

    International Nuclear Information System (INIS)

    The infrared conductivity of V2O3 is measured in the whole phase diagram to study the behavior of quasiparticles which appear above the Neel temperature TN, and eventually disappear further enhancing the temperature. We present theoretical calculations demonstrating that this loss of coherence in the vicinity of the Mott transition is enhanced by small changes of the lattice parameters. This leads to a downturn in the optical conductivity at small frequencies, as our experimental data show above 450 K

  11. NEUTRONIC REACTOR

    Science.gov (United States)

    Anderson, H.L.

    1960-09-20

    A nuclear reactor is described comprising fissionable material dispersed in graphite blocks, helium filling the voids of the blocks and the spaces therebetween, and means other than the helium in thermal conductive contact with the graphite for removing heat.

  12. NUCLEAR REACTOR

    Science.gov (United States)

    Miller, H.I.; Smith, R.C.

    1958-01-21

    This patent relates to nuclear reactors of the type which use a liquid fuel, such as a solution of uranyl sulfate in ordinary water which acts as the moderator. The reactor is comprised of a spherical vessel having a diameter of about 12 inches substantially surrounded by a reflector of beryllium oxide. Conventionnl control rods and safety rods are operated in slots in the reflector outside the vessel to control the operation of the reactor. An additional means for increasing the safety factor of the reactor by raising the ratio of delayed neutrons to prompt neutrons, is provided and consists of a soluble sulfate salt of beryllium dissolved in the liquid fuel in the proper proportion to obtain the result desired.

  13. Nuclear reactors

    International Nuclear Information System (INIS)

    This draft chart contains graphical symbols from which the type of (nuclear) reactor can be seen. They will serve as illustrations for graphical sketches. Important features of the individual reactor types are marked out graphically. The user can combine these symbols to characterize a specific reactor type. The basic graphical symbol is a square with a point in the centre. Functional groups can be depicted for closer specification. If two functional groups are not clearly separated, this is symbolized by a dotted line or a channel. Supply and discharge lines for coolant, moderator and fuel are specified in accordance with DIN 2481 and can be further specified by additional symbols if necessary. The examples in the paper show several different reactor types. (orig./AK)

  14. Upgrade of main separation planes (HDR) of steam generator primary and secondary headers and side manholes

    International Nuclear Information System (INIS)

    Repairs performed during the Bohunice V-1 reactor and Bohunice V-2 reactor operation are briefly described. Grooves were repaired in all headers in turn. Crack indications were found in the border area between the austenitic weld deposit and the basic material, and the sealing surfaces of primary header covers were repaired by local grinding-out and welding. Special devices and technologies were developed for this purpose. An upgrade of the main separation planes was elaborated in order to replace nickel seals with graphite-based seals. The upgrade technology has already been applied to 2 pieces of primary header covers, the other upgrade technologies will be applied starting from 1999. (M.D.)

  15. Multifunctional reactors

    OpenAIRE

    Westerterp, K.R.

    1992-01-01

    Multifunctional reactors are single pieces of equipment in which, besides the reaction, other functions are carried out simultaneously. The other functions can be a heat, mass or momentum transfer operation and even another reaction. Multifunctional reactors are not new, but they have received much emphasis in research in the last decade. A survey is given of modern developments and the first successful applications on a large scale. It is explained why their application in many instances is ...

  16. NUCLEAR REACTOR

    Science.gov (United States)

    Anderson, C.R.

    1962-07-24

    A fluidized bed nuclear reactor and a method of operating such a reactor are described. In the design means are provided for flowing a liquid moderator upwardly through the center of a bed of pellets of a nentron-fissionable material at such a rate as to obtain particulate fluidization while constraining the lower pontion of the bed into a conical shape. A smooth circulation of particles rising in the center and falling at the outside of the bed is thereby established. (AEC)

  17. Nuclear reactor

    International Nuclear Information System (INIS)

    In order to reduce neutron embrittlement of the pressue vessel of an LWR, blanked off elements are fitted at the edge of the reactor core, with the same dimensions as the fuel elements. They are parallel to each other, and to the edge of the reactor taking the place of fuel rods, and are plates of neutron-absorbing material (stainless steel, boron steel, borated Al). (HP)

  18. Breeder reactors

    International Nuclear Information System (INIS)

    The reasons for the development of fast reactors are briefly reviewed (a propitious neutron balance oriented towards a maximum uranium burnup) and its special requirements (cooling, fissile material density and reprocessing) discussed. The three stages in the French program of fast reactor development are outlined with Rapsodie at Cadarache, Phenix at Marcoule, and Super Phenix at Creys-Malville. The more specific features of the program of research and development are emphasized: kinetics and the core, the fuel and the components

  19. Is alpha-V2O5 a cathode material for Mg insertion batteries?

    Science.gov (United States)

    Sa, Niya; Wang, Hao; Proffit, Danielle L.; Lipson, Albert L.; Key, Baris; Liu, Miao; Feng, Zhenxing; Fister, Timothy T.; Ren, Yang; Sun, Cheng-Jun; Vaughey, John T.; Fenter, Paul A.; Persson, Kristin A.; Burrell, Anthony K.

    2016-08-01

    When designing a high energy density battery, one of the critical features is a high voltage, high capacity cathode material. In the development of Mg batteries, oxide cathodes that can reversibly intercalate Mg, while at the same time being compatible with an electrolyte that can deposit Mg reversibly are rare. Herein, we report the compatibility of Mg anodes with α-V2O5 by employing magnesium bis(trifluoromethane sulfonyl)imide in diglyme electrolytes at very low water levels. Electrolytes that contain a high water level do not reversibly deposit Mg, but interestingly these electrolytes appear to enable much higher capacities for an α-V2O5 cathode. Solid state NMR indicates that the major source of the higher capacity in high water content electrolytes originates from reversible proton insertion. In contrast, we found that lowering the water level of the magnesium bis(trifluoromethane sulfonyl)imide in diglyme electrolyte is critical to achieve reversible Mg deposition and direct evidence for reversible Mg intercalation is shown. Findings we report here elucidate the role of proton intercalation in water-containing electrolytes and clarify numerous conflicting reports of Mg insertion into α-V2O5.

  20. Robust Supersolidity in the V1- V2 Extended Bose-Hubbard Model

    Science.gov (United States)

    Greene, Nicole; Pixley, Jedediah

    2016-05-01

    Motivated by ultra-cold atomic gases with long-range interactions in an optical lattice we study the effects of the next-nearest neighbor interaction on the extended Bose-Hubbard model on a square lattice. Using the variational Gutzwiller approach with a four-site unit cell we determine the ground state phase diagrams as a function of the model parameters. We focus on the interplay of each interaction between the nearest neighbor (V1) , the next-nearest neighbor (V2) , and the onsite repulsion (U). We find various super-solid phases that can be described by one of the ordering wave-vectors (π, 0), (0, π) , and (π, π) . In the limits V1, V2 U we find phases reminiscent of the limit V2 = 0 but with a richer super solid structure. For V1 qualitatively new super solid phase that is quite stable and occupies a large region of the phase diagram. For sufficiently strong interactions we find various Mott and charge density wave (CDW) insulating phases that can be understood in the classical limit (i.e. no inter-site tunneling). We characterize the nature of each quantum phase transition between Mott/CDW to super-solid to superfluid at the mean field level.

  1. Toward a solution to the RAA and v2 puzzle for heavy quarks

    Directory of Open Access Journals (Sweden)

    Santosh K. Das

    2015-07-01

    Full Text Available The heavy quarks constitute a unique probe of the quark–gluon plasma properties. A puzzling relation between the nuclear modification factor RAA(pT and the elliptic flow v2(pT has been observed both at RHIC and LHC energies. Predicting correctly both observables has been a challenge to all existing models, especially for D mesons. We discuss how the temperature dependence of the heavy quark drag coefficient is responsible for a large part of such a puzzle. In particular, we have considered four different models to evaluate the temperature dependence of drag and diffusion coefficients propagating through a quark gluon plasma (QGP. All the four different models are set to reproduce the same RAA(pT observed in experiments at RHIC and LHC energy. We point out that for the same RAA(pT one can generate 2–3 times more v2 depending on the temperature dependence of the heavy quark drag coefficient. A non-decreasing drag coefficient as T→Tc is a major ingredient for a simultaneous description of RAA(pT and v2(pT.

  2. Synthesis, structural and electrochemical properties of electron beam evaporated V2O5 thin films

    International Nuclear Information System (INIS)

    Vanadium pentoxide is one of the most promising cathode materials because it offers high energy density, low cost, low toxicity over the other cathode materials. Its layered and open structure makes this material in thin film form well suited for electro-chemical insertion reactions with the Li ions. In the present investigation, V2O5 thin films have been prepared by electron beam evaporation technique on gold coated silicon substrates maintained at a substrate temperature of 250°C in an oxygen partial pressure of 2 × 10−4 mbar. The XRD patterns exhibited three predominant diffraction peaks corresponding to (200) (001) and (400) planes of orthorhombic phase of V2O5 with Pmnm space group. The electrochemical characteristics of V2O5 thin films with thickness of 600 nm were examined in non-aqueous region. The film exhibited step wise discharge with two plateaus. The as-deposited film delivered a discharge capacity of 70 μAh/(cm2-μm) at a current density of 30 μA/cm2. Annealing of these films at 450°C exhibited a better discharge capacity of 90 μAh/(cm2-μm).

  3. Synthesis, structural and electrochemical properties of electron beam evaporated V2O5 thin films

    Science.gov (United States)

    Hussain, O. M.; Rosaiah, P.

    2012-06-01

    Vanadium pentoxide is one of the most promising cathode materials because it offers high energy density, low cost, low toxicity over the other cathode materials. Its layered and open structure makes this material in thin film form well suited for electro-chemical insertion reactions with the Li ions. In the present investigation, V2O5 thin films have been prepared by electron beam evaporation technique on gold coated silicon substrates maintained at a substrate temperature of 250°C in an oxygen partial pressure of 2 × 10-4 mbar. The XRD patterns exhibited three predominant diffraction peaks corresponding to (200) (001) and (400) planes of orthorhombic phase of V2O5 with Pmnm space group. The electrochemical characteristics of V2O5 thin films with thickness of 600 nm were examined in non-aqueous region. The film exhibited step wise discharge with two plateaus. The as-deposited film delivered a discharge capacity of 70 μAh/(cm2-μm) at a current density of 30 μA/cm2. Annealing of these films at 450°C exhibited a better discharge capacity of 90 μAh/(cm2-μm).

  4. Impression of plasma voltage on growth of α-V2O5 nanostructured thin films

    International Nuclear Information System (INIS)

    In this communication, we synthesized vanadium pentoxide (α-V2O5) nanostructured thin films (NSTs) accompanied with nanoflakes/ nanoplates on the Ni-coated glass substrates employing plasma assisted sublimation process (PASP) as a function of plasma voltage (Vp). The effect of plasma voltage on structural, morphological, compositional, and vibrational properties have been studied systematically. The structural analysis divulged that all films deposited at different Vp have pure orthorhombic phase, no impurity phase is detected under resolution limit of XRD and XPS. The morphological studies of samples is carried out by SEM, revealed that features as well as alignment of V2O5 NSTs is greatly monitored by Vp and the film possessing the best features is obtained at 2500volt. In addition, XPS results reveal that V5+ oxidation state is the most prominent state in sample V2, which represents better stoichiometric nature of film. The vibrational study of all samples is performed by FTIR and strongly support the XRD observations. All the results are in consonance with each other

  5. Compositional, microstructural, and vibrational characteristics of synthesized V2O5 microspheres with nanorod formation

    Science.gov (United States)

    Dhayal Raj, A.; Suresh Kumar, P.; Yang, Q.; Mangalaraj, D.; Ponpandian, N.; Albert Irudayaraj, A.

    2013-07-01

    Microspheres composed of vanadium pentoxide nanorods have been successfully synthesized using a single step solvothermal method. Field emission scanning electron microscope (FE-SEM) and transmission electron microscope (TEM) analysis were used to characterize the morphology of the nanorod-like structures. The results show that the microspheres have an average diameter of 3.5 μm and that the diameter of the nanorods, of which these microspheres consist, ranges from 150 to 200 nm. Chemical and phase composition of the microspheres was analyzed using X-ray Photoemission Spectroscopy (XPS), X-ray diffraction (XRD), and Selective Area Electron Diffraction (SAED). XRD patterns show that the nanorods are composed of V2O5 phase. The SAED patterns confirm the polycrystalline nature of V2O5 phase in the samples. The XPS spectra indicate that the surface of the microsphere samples consist predominantly of vanadium in its V5+ oxidation state. Vibrational analysis was done using Raman spectroscopy and Fourier transform Infrared spectroscopy and the results further confirm the formation of V2O5 phase.

  6. Impression of plasma voltage on growth of α-V2O5 nanostructured thin films

    Science.gov (United States)

    Sharma, Rabindar Kumar; Kumar, Prabhat; Reddy, G. B.

    2015-06-01

    In this communication, we synthesized vanadium pentoxide (α-V2O5) nanostructured thin films (NSTs) accompanied with nanoflakes/ nanoplates on the Ni-coated glass substrates employing plasma assisted sublimation process (PASP) as a function of plasma voltage (Vp). The effect of plasma voltage on structural, morphological, compositional, and vibrational properties have been studied systematically. The structural analysis divulged that all films deposited at different Vp have pure orthorhombic phase, no impurity phase is detected under resolution limit of XRD and XPS. The morphological studies of samples is carried out by SEM, revealed that features as well as alignment of V2O5 NSTs is greatly monitored by Vp and the film possessing the best features is obtained at 2500volt. In addition, XPS results reveal that V5+ oxidation state is the most prominent state in sample V2, which represents better stoichiometric nature of film. The vibrational study of all samples is performed by FTIR and strongly support the XRD observations. All the results are in consonance with each other.

  7. Kinect v2 and RGB Stereo Cameras Integration for Depth Map Enhancement

    Science.gov (United States)

    Ravanelli, R.; Nascetti, A.; Crespi, M.

    2016-06-01

    Today range cameras are widespread low-cost sensors based on two different principles of operation: we can distinguish between Structured Light (SL) range cameras (Kinect v1, Structure Sensor, ...) and Time Of Flight (ToF) range cameras (Kinect v2, ...). Both the types are easy to use 3D scanners, able to reconstruct dense point clouds at high frame rate. However the depth maps obtained are often noisy and not enough accurate, therefore it is generally essential to improve their quality. Standard RGB cameras can be a valuable solution to solve such issue. The aim of this paper is therefore to evaluate the integration feasibility of these two different 3D modelling techniques, characterized by complementary features and based on standard low-cost sensors. For this purpose, a 3D model of a DUPLOTM bricks construction was reconstructed both with the Kinect v2 range camera and by processing one stereo pair acquired with a Canon Eos 1200D DSLR camera. The scale of the photgrammetric model was retrieved from the coordinates measured by Kinect v2. The preliminary results are encouraging and show that the foreseen integration could lead to an higher metric accuracy and a major level of completeness with respect to that obtained by using only separated techniques.

  8. Electric-field-induced semiconductor-semiconductor transition in V2O5

    Science.gov (United States)

    Fisher, B.; Genossar, J.; Patlagan, L.; Chashka, K. B.; Reisner, G. M.

    2015-08-01

    We report on DC I- V characteristics of two crystalline V2O5 fibers measured at room temperature over a range of currents of more than four orders of magnitude. At low currents, the resistances of the samples decrease exponentially with voltage, a behavior that can be attributed to field-enhanced tunneling. At higher currents, self-heating induces hysteretic nonlinear conductivity and small jumps toward lower resistances. In the highest range of currents, the I- V characteristics exhibit dramatic switching toward a new state with much lower resistance and memory. At first, switching could be repeated several times by cycling the sample between lower and higher currents. Eventually, a final state stabilized with smooth nonlinear I- V characteristics. The temperature dependence of the resistance of both the initial and final states is activated with similar activation energies; the voltage dependence of the resistance at low currents is also similar except for the large ratio of the pre-exponents. The final state of the samples was identified by the X-ray diffraction pattern of one of them, as the stable α-V2O5 phase. An interpretation of these results based on switching between metastable and stable phases of V2O5 is proposed.

  9. Spatial structure of neuronal receptive field in awake monkey secondary visual cortex (V2).

    Science.gov (United States)

    Liu, Lu; She, Liang; Chen, Ming; Liu, Tianyi; Lu, Haidong D; Dan, Yang; Poo, Mu-ming

    2016-02-16

    Visual processing depends critically on the receptive field (RF) properties of visual neurons. However, comprehensive characterization of RFs beyond the primary visual cortex (V1) remains a challenge. Here we report fine RF structures in secondary visual cortex (V2) of awake macaque monkeys, identified through a projection pursuit regression analysis of neuronal responses to natural images. We found that V2 RFs could be broadly classified as V1-like (typical Gabor-shaped subunits), ultralong (subunits with high aspect ratios), or complex-shaped (subunits with multiple oriented components). Furthermore, single-unit recordings from functional domains identified by intrinsic optical imaging showed that neurons with ultralong RFs were primarily localized within pale stripes, whereas neurons with complex-shaped RFs were more concentrated in thin stripes. Thus, by combining single-unit recording with optical imaging and a computational approach, we identified RF subunits underlying spatial feature selectivity of V2 neurons and demonstrated the functional organization of these RF properties. PMID:26839410

  10. Neutronic design of small reactors

    International Nuclear Information System (INIS)

    Small reactors design is one of the main activities of AREVA TA. At the time, AREVA TA main projects are oriented towards research reactors and reactors for military naval propulsion. Due to differences in the physics and performances to meet, each kind of small reactor leads to specific modelling needs. Many computing tools have been developed in order to successfully carry out these projects. These schemes are mainly based on the use of TRIPOLI, MCNP, APOLLO2 and CRONOS2 codes. In that framework, a multi-purpose pre/post processing tool named CHARM is being developed by AREVA NP in partnership with AREVA TA in order to integrate small reactors specification. CHARM is used to elaborate APOLLO2 input data while various dedicated tools are used to automatically generate TRIPOLI and MNCP input data. These 3D numerical models need a very accurate spatial description to perform specific calculations. As an example, for the JHR design, after calculating 3D burn up by APOLLO2/MOC models, the data is fed back into a TRIPOLI model used for safety analyses. This paper presents our methodology for the small core design and 3 examples: 1) The calculation scheme for the JHR (Jules Horowitz Reactor) neutronic studies. These design studies are a recent illustration of combined use of both deterministic and probabilistic codes, 2) The use of CHARM, with the modelling of a JHR core. The purpose of CHARM- V2, based on Open Cascade Technology, is to provide a pre/post processing tool for APOLLO2/MOC, TRIPOLI4 and MCNP solvers, 3) The depletion Monte Carlo calculation of a MTR core. (author)

  11. Butanol Dehydration over V2O5-TiO2/MCM-41 Catalysts Prepared via Liquid Phase Atomic Layer Deposition

    Directory of Open Access Journals (Sweden)

    Jong-Ki Jeon

    2013-04-01

    Full Text Available MCM-41 was used as a support and, by using atomic layer deposition (ALD in the liquid phase, a catalyst was prepared by consecutively loading titanium oxide and vanadium oxide to the support. This research analyzes the effect of the loading amount of vanadium oxide on the acidic characteristics and catalytic performance in the dehydration of butanol. The physical and chemical characteristics of the TiO2-V2O5/MCM-41 catalysts were analyzed using XRF, BET, NH3-TPD, XRD, Py-IR, and XPS. The dehydration reaction of butanol was performed in a fixed bed reactor. For the samples with vanadium oxide loaded to TiO2/MCM-41 sample using the liquid phase ALD method, it was possible to increase the loading amount until the amount of vanadium oxide reached 12.1 wt %. It was confirmed that the structural properties of the mesoporous silica were retained well after titanium oxide and vanadium loading. The NH3-TPD and Py-IR results indicated that weak acid sites were produced over the TiO2/MCM-41 samples, which is attributed to the generation of Lewis acid sites. The highest activity of the V2O5(12.1-TiO2/MCM-41 catalyst in 2-butanol dehydration is ascribed to it having the highest number of Lewis acid sites, as well as the highest vanadium dispersion.

  12. 空心聚吡咯/V2O5复合材料的制备及其电化学性能%Preparation and electrochemical performance of hollow-spherical polypyrrole/V2O5 composite

    Institute of Scientific and Technical Information of China (English)

    王远洪; 刘恒; 朱丁; 郭再萍; 刘华坤; 窦诗学

    2011-01-01

    为改善晶态V2O5 (c-V2O5)正极材料实际容量较低、循环性能较差等问题,制备了空心球聚吡咯/V205复合材料.利用导电吡咯单体(Py)在中空型V2O5层间发生原位氧化聚合反应制备聚吡咯(PPy)/中空型V2O5复合材料( HS-PPy/V2O5).采用X射线衍射仪(XRD)、扫描电镜(SEM)、透射电镜(TEM)对样品进行表征,采用恒流充放电测试和电化学阻抗(EIS)测试样品的电化学性能.结果表明,Py单体己插入中空型V2O5层间,与纯中空型V2O5相比,制备的HS-PPY/V2O5复合材料比容量虽然有所减小,但是循环稳定性有较大的提高.

  13. LiV2O4: A heavy fermion transition metal oxide

    International Nuclear Information System (INIS)

    The format of this dissertation is as follows. In the remainder of Chapter 1, brief introductions and reviews are given to the topics of frustration, heavy fermions and spinels including the precedent work of LiV2O4. In Chapter 2, as a general overview of this work the important publication in Physical Review Letters by the author of this dissertation and collaborators regarding the discovery of the heavy fermion behavior in LiV2O4 is introduced [removed for separate processing]. The preparation methods employed by the author for nine LiV2O4 and two Li1+xTi2-xO4 (x = 0 and 1/3) polycrystalline samples are introduced in Chapter 3. The subsequent structural characterization of the LiV2O4 and Li1+xTi2-xO4 samples was done by the author using thermogravimetric analysis (TGA), x-ray diffraction measurements and their structural refinements by the Rietveld analysis. The results of the characterization are detailed in Chapter 3. In Chapter 4 magnetization measurements carried out by the author are detailed. In Chapter 5, after briefly discussing the resistivity measurement results including the single-crystal work by Rogers et al., for the purpose of clear characterization of LiV2O4 it is of great importance to introduce in the following chapters the experiments and subsequent data analyses done by his collaborators. Heat capacity measurements (Chapter 6) were carried out and analyzed by Dr. C.A. Swenson, and modeled theoretically by Dr. D.C. Johnston. In Chapter 7 a thermal expansion study using neutron diffraction by Dr. O. Chmaissem et al. and capacitance dilatometry measurements by Dr. C.A. Swenson are introduced. The data analyses for the thermal expansion study were mainly done by Dr. O. Chmaissem (for neutron diffraction) and Dr. C.A. Swendon (for dilatometry), with assistances by Dr. J.D. Jorgensen, Dr. D.C. Johnston, and S. Kondo the author of this dissertation. Chapter 8 describes nuclear magnetic resonance (NMR) measurements and analyses by Dr. A.V. Mahajan, R

  14. Proceedings of the International conference on energy alternatives/risk education V. 2

    International Nuclear Information System (INIS)

    This Proceedings volume on Energy and Risk within the context of the International Conference on Energy Alternatives/Risk Education contains papers on Nuclear Energy, on Background Radiation and on Risks of Energy Alternatives. 15 papers concerning safety of nuclear reactors, case stories of reactor and radiation accidents, monitoring low-level indoor radiation, educational tods, comparison of energy system risks, and catalyzed fusion were indexed and abstracted separately for the INIS database. (R.P.)

  15. SpaceCube v2.0 Space Flight Hybrid Reconfigurable Data Processing System

    Science.gov (United States)

    Petrick, Dave

    2014-01-01

    This paper details the design architecture, design methodology, and the advantages of the SpaceCube v2.0 high performance data processing system for space applications. The purpose in building the SpaceCube v2.0 system is to create a superior high performance, reconfigurable, hybrid data processing system that can be used in a multitude of applications including those that require a radiation hardened and reliable solution. The SpaceCube v2.0 system leverages seven years of board design, avionics systems design, and space flight application experiences. This paper shows how SpaceCube v2.0 solves the increasing computing demands of space data processing applications that cannot be attained with a standalone processor approach.The main objective during the design stage is to find a good system balance between power, size, reliability, cost, and data processing capability. These design variables directly impact each other, and it is important to understand how to achieve a suitable balance. This paper will detail how these critical design factors were managed including the construction of an Engineering Model for an experiment on the International Space Station to test out design concepts. We will describe the designs for the processor card, power card, backplane, and a mission unique interface card. The mechanical design for the box will also be detailed since it is critical in meeting the stringent thermal and structural requirements imposed by the processing system. In addition, the mechanical design uses advanced thermal conduction techniques to solve the internal thermal challenges.The SpaceCube v2.0 processing system is based on an extended version of the 3U cPCI standard form factor where each card is 190mm x 100mm in size The typical power draw of the processor card is 8 to 10W and scales with application complexity. The SpaceCube v2.0 data processing card features two Xilinx Virtex-5 QV Field Programmable Gate Arrays (FPGA), eight memory modules, a monitor

  16. Research reactors - an overview

    Energy Technology Data Exchange (ETDEWEB)

    West, C.D.

    1997-03-01

    A broad overview of different types of research and type reactors is provided in this paper. Reactor designs and operating conditions are briefly described for four reactors. The reactor types described include swimming pool reactors, the High Flux Isotope Reactor, the Mark I TRIGA reactor, and the Advanced Neutron Source reactor. Emphasis in the descriptions is placed on safety-related features of the reactors. 7 refs., 7 figs., 2 tabs.

  17. Application of V2O5 thin films deposited by laser ablation in micron batteries of solid state

    International Nuclear Information System (INIS)

    The obtained results from synthesizing V2O5 thin films by laser ablation are presented. Depending on the deposit conditions V2O5 thin films have been grown as amorphous as a crystalline ones with preferential orientation. The results of the electrochemical characterization of one of the synthesized layers are presented when being manufactured joint with it a micron battery. (Author)

  18. The Structural Evolution of V2O5 Nanocystals during Electrochemical Cycling Studied Using In operando Synchrotron Techniques

    International Nuclear Information System (INIS)

    The structural evolution of vanadium oxide (V2O5) nanocrystals was studied during Li+ ion intercalation and deintercalation (i.e. electrochemical discharge/charge) processes using in operando high-energy x-ray diffraction (HEXRD) and in operando x-ray adsorption near edge spectroscopy (XANES). The HEXRD results clearly show that V2O5 undergoes phase transformations during the first Li+ ion intercalation (i.e. discharge) process. The analysis of the XANES data suggests that the average oxidation state of vanadium in fully charged V2O5 nanocrystals decreases to less than +5 after the first four cycles. The combined results of the unchanged crystal structure (HEXRD) and the decreased oxidation state (XANES) lead to the conclusion that some of the Li+ ions are trapped within the V2O5 framework and the V2O5 exists as Li0.18V2O5 instead of pure V2O5 after the first four cycles, while the trapped Li+ ion may increase the stability of V2O5 framework

  19. Rare Earth Free Zn3V2O8 Phosphor with Controlled Microstructure and Its Photocatalytic Activity

    Directory of Open Access Journals (Sweden)

    Hom Nath Luitel

    2013-01-01

    Full Text Available Microsphere of rare earth free phosphor, Zn3V2O8, with broadband yellowish white emission was synthesized by combustion route and compared with the hydrothermal, sol-gel, and solid state reaction methods. The phosphor samples were characterized by X-ray diffraction and scanning electron microscopy. UV-visible absorption and photoluminescence (PL emission and excitation spectra were investigated for these phosphors. Zn3V2O8 phosphor containing 10 mol% of H3BO3 flux exhibited enhanced PL emission showing broadband from 450 nm to 750 nm. Effect of stoichiometry of Zn and V on the host lattice and its effect on the PL emission spectra were studied. Series of Mg3V2O8, Ca3V2O8, and Sr3V2O8 phosphors were also synthesized and compared to the Zn3V2O8 phosphor in terms of PL emission and internal quantum yield, and it was found that Zn3V2O8 is the most efficient phosphor among the other phosphors studied with quantum yield of 60%. The visible light irradiated photocatalytic activity of these phosphors was investigated and it was found that the hydrothermal Zn3V2O8 exhibited enhanced activity.

  20. V2G Market Price Strategy Based on Reverse Supply%基于逆向供应的V2G市场电价策略研究

    Institute of Scientific and Technical Information of China (English)

    史乐峰; 任玉珑; 俞集辉; 申威

    2012-01-01

    There is a growing interest in studying electric vehicles (EV) because it has the potential of coping with the rising gas price and environmental pollution caused by automobile emissions. The academic is particularly interested in studying the relationships among EV, V2C technology, and grid. The current literature on V2C technology is limited to research areas in the system optimization, affluence of technology, or economic and environment influence of V2C technology.The V2C technology is based on the situation that most electric vehicles remain connected with power grid and provide voluntarilyauxiliary services, such as peak load regulation and frequency regulation. Most of current research makes the assumption that an operator is in charge of coordination of electric vehicles. This paper attempts to discuss an incentive power price strategy which can connect EV owners with the EV and power grid following the requirement of grid operation by taking the reverse power supply of electric vehicles to power grid through V2C technology as the research object. The strategy can also set a V2G market to Bchieve the incentive compatibility between electric vehicle owners and power companies by influencing the electric vehicle owners with V2G price0In the first part, the V2G market model of auxiliary service transaction between EV owners and power companies is structured. Power companies possesses a market initiative in V2G market and exerts an influence on charge-discharge behavior of EV owners through V2G price0 In addition, the power demand model of EV owner is established based on V2G market in the condition that power companies sets different strategies about charging price during peak hours. The Utter two parts of this paper calculate the respective benefits of EV owners and power companies in the V2C market when different price strategies are used by power companies. The comparison shows that higher market response can be obtained with lower V2G price resulted from

  1. Grid Interconnection and Performance Testing Procedures for Vehicle-To-Grid (V2G) Power Electronics: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Kramer, W.; Chakraborty, S.; Kroposki, B.; Hoke, A.; Martin, G.; Markel, T.

    2012-03-01

    Bidirectional power electronics can add vehicle-to-grid (V2G) capability in a plug-in vehicle, which then allows the vehicle to operate as a distributed resource (DR). The uniqueness of the battery-based V2G power electronics requires a test procedure that will not only maintain IEEE interconnection standards, but can also evaluate the electrical performance of the vehicle working as a DR. The objective of this paper is to discuss a recently published NREL technical report that provides interim test procedures for V2G vehicles for their integration into the electrical distribution systems and for their performance in terms of continuous output power, efficiency, and losses. Additionally, some other test procedures are discussed that are applicable to a V2G vehicle that desires to provide power reserve functions. A few sample test results are provided based on testing of prototype V2G vehicles at NREL.

  2. Growth of α-V2O5 nanostructured thin films as a function of deposition process

    Science.gov (United States)

    Singh, Megha; Sharma, Rabindar K.; Reddy, G. B.

    2016-05-01

    In this communication, we synthesizedvanadium pentoxide (α-V2O5) nanostructured thin films (NSTs) using four different methods for obtaining vanadate species namely thermal evaporation (source of vanadate species are V2O5 powder and vanadium metal foil) and plasma assisted sublimation process (source of vanadate species are V2O5 powder and vanadium metal foil). The effect of plasmaon morphological and structural propertieshave been systematicallystudied. XRD revealed thermal evaporation process yielded amorphous films whereassublimation process yielded highly crystalline α-V2O5 films. HRTEM of nanobelts show, the growth is preferred in (001) crystallographic direction with interplanar distance of 0.43 nm. XPS revealed O/V ratio of ~2.4, which nearly agrees with standard V2O5 stoichiometry. SEM revealed deposition process affect morphology of films; thermal evaporation results in smoother film while plasma assisted sublimation process reveals nanoflakes and nanobelts (NBs). All the results are inconcordance with each other.

  3. Synthesis of nanosized V2O5 coated SiO2 catalyst by the gel combustion method

    International Nuclear Information System (INIS)

    Catalysts nanosized V2O5/SiO2 powder has been synthesised at 550oC by the combustion of gel prepared from polyvinyl alcohol (PVA) and vanadium nitrates. V2O5/SiO2, characterization is examined by X-ray diffraction (XRD), scanning electron microscopy (SEM) and BET (Brunaure-Emmet-Teller) measurements. Purther thermal treatment at 550oC for 1.5 hrs yields the single phase of V2O5. Average particle size of V2O5 is 80 nm and specific surface area of V2O5/SiO2 is 13.50 m2/g. (author)

  4. Reactor utilization

    International Nuclear Information System (INIS)

    In 1962, the RA reactor was operated almost three times more than in 1961, producing total of 25 555 MWh. Diagram containing comparative data about reactor operation for 1960, 1961, and 1962, percent of fuel used and U-235 burnup shows increase in reactor operation. Number of samples irradiated was 659, number of experiments done was 16. mean powered level was 5.93 MW. Fuel was added into the core twice during the reporting year. In fact the core was increased from 56 to 68 fuel channels and later to 84 fuel channels. Fuel was added to the core when the reactivity worth decreased to the minimum operation level due to burnup. In addition to this 5 central fuel channels were exchanged with fresh fuel in february for the purpose of irradiation in the VISA-2 channel

  5. Reactor Neutrinos

    CERN Document Server

    Lasserre, T; Lasserre, Thierry; Sobel, Henry W.

    2005-01-01

    We review the status and the results of reactor neutrino experiments, that toe the cutting edge of neutrino research. Short baseline experiments have provided the measurement of the reactor neutrino spectrum, and are still searching for important phenomena such as the neutrino magnetic moment. They could open the door to the measurement of coherent neutrino scattering in a near future. Middle and long baseline oscillation experiments at Chooz and KamLAND have played a relevant role in neutrino oscillation physics in the last years. It is now widely accepted that a new middle baseline disappearance reactor neutrino experiment with multiple detectors could provide a clean measurement of the last undetermined neutrino mixing angle theta13. We conclude by opening on possible use of neutrinos for Society: NonProliferation of Nuclear materials and Geophysics.

  6. GeoSciML v2: an interchange and mark-up language for geologic information

    Science.gov (United States)

    Laxton, J.

    2009-04-01

    GeoSciML was released in 2006 as a data transfer standard for geoscience. The scope of GeoSciML is the information generally shown on geological maps along with some observations, in particular those made using boreholes. Following further testing and use-case analysis GeoSciML v2 has recently been released incorporating enhanced representation of geologic units, earth materials, structures and associated vocabularies. The model utilizes the XML-based Open Geospatial Consortium (OGC) Geography Markup Language (GML) for spatial information, and Observations and Measurements markup schema (O&M) for field and lab observations, including boreholes. In the GeoSciML conceptual model, 'mapped features,' which represent occurrences such as a polygon or curve on a geologic map, are specified by a 'geologic feature,' which is a typed description of an entity analogous to a 'legend item' on a map. The two main types of geologic feature modelled are geologic units and geologic structures. GeoSciML also includes a structure for controlled concepts that may be defined in terms of normative geologic features, GeoSciML earth material descriptions, or an entity from some other schema. Controlled concepts can be built into geologic vocabularies, such as stratigraphic lexicons, and are used as the basis for classification. GeoSciMLv2 has been proven in an OGC web services compliant testbed comprising services from 10 geological surveys worldwide. Testbed services and products include Web Mapping Services (WMS) and Web Feature Services (WFS) serving data in GeoSciML v2 form; catalog and vocabulary services, and metadata for such services; registers of vocabularies; and clients capable of using, querying and rendering such services. The paper will describe the GeoSciML v2 resources available and how to obtain them. These include the schema representation in UML and W3C XSD, documentation describing the schema and how to use it, and example data files.

  7. The Variable Vector Countermeasure Suit (V2Suit for Space Habitation and Exploration

    Directory of Open Access Journals (Sweden)

    Kevin R Duda

    2015-04-01

    Full Text Available The Variable Vector Countermeasure Suit (V2Suit for Space Habitation and Exploration is a novel system concept that provides a platform for integrating sensors and actuators with daily astronaut intravehicular activities to improve health and performance, while reducing the mass and volume of the physiologic adaptation countermeasure systems, as well as the required exercise time during long-duration space exploration missions. The V2Suit system leverages wearable kinematic monitoring technology and uses inertial measurement units (IMUs and control moment gyroscopes (CMGs within miniaturized modules placed on body segments to provide a viscous resistance during movements against a specified direction of down – initially as a countermeasure to the sensorimotor adaptation performance decrements that manifest themselves while living and working in microgravity and during gravitational transitions during long-duration spaceflight, including post-flight recovery and rehabilitation. Several aspects of the V2Suit system concept were explored and simulated prior to developing a brassboard prototype for technology demonstration. This included a system architecture for identifying the key components and their interconnects, initial identification of key human-system integration challenges, development of a simulation architecture for CMG selection and parameter sizing, and the detailed mechanical design and fabrication of a module. The brassboard prototype demonstrates closed-loop control from down initialization through CMG actuation, and provides a research platform for human performance evaluations to mitigate sensorimotor adaptation, as well as a tool for determining the performance requirements when used as a musculoskeletal deconditioning countermeasure. This type of countermeasure system also has Earth benefits, particularly in gait or movement stabilization and rehabilitation.

  8. The Variable Vector Countermeasure Suit (V2Suit) for space habitation and exploration.

    Science.gov (United States)

    Duda, Kevin R; Vasquez, Rebecca A; Middleton, Akil J; Hansberry, Mitchell L; Newman, Dava J; Jacobs, Shane E; West, John J

    2015-01-01

    The "Variable Vector Countermeasure Suit (V2Suit) for Space Habitation and Exploration" is a novel system concept that provides a platform for integrating sensors and actuators with daily astronaut intravehicular activities to improve health and performance, while reducing the mass and volume of the physiologic adaptation countermeasure systems, as well as the required exercise time during long-duration space exploration missions. The V2Suit system leverages wearable kinematic monitoring technology and uses inertial measurement units (IMUs) and control moment gyroscopes (CMGs) within miniaturized modules placed on body segments to provide a "viscous resistance" during movements against a specified direction of "down"-initially as a countermeasure to the sensorimotor adaptation performance decrements that manifest themselves while living and working in microgravity and during gravitational transitions during long-duration spaceflight, including post-flight recovery and rehabilitation. Several aspects of the V2Suit system concept were explored and simulated prior to developing a brassboard prototype for technology demonstration. This included a system architecture for identifying the key components and their interconnects, initial identification of key human-system integration challenges, development of a simulation architecture for CMG selection and parameter sizing, and the detailed mechanical design and fabrication of a module. The brassboard prototype demonstrates closed-loop control from "down" initialization through CMG actuation, and provides a research platform for human performance evaluations to mitigate sensorimotor adaptation, as well as a tool for determining the performance requirements when used as a musculoskeletal deconditioning countermeasure. This type of countermeasure system also has Earth benefits, particularly in gait or movement stabilization and rehabilitation. PMID:25914631

  9. In mice lacking V2a interneurons, gait depends on speed of locomotion

    OpenAIRE

    Crone, Steven A.; Zhong, Guisheng; Harris-Warrick, Ronald; Sharma, Kamal

    2009-01-01

    Many animals are capable of changing gait with speed of locomotion. The neural basis of gait control and its dependence on speed are not fully understood. Mice normally use a single “trotting” gait while running at all speeds, either over ground or on a treadmill. Transgenic mouse mutants in which the trotting is replaced by hopping also lack a speed-dependent change in gait. Here we describe a transgenic mouse model in which the V2a interneurons have been ablated by targeted expression of di...

  10. Searching the protein structure database for ligand-binding site similarities using CPASS v.2

    Directory of Open Access Journals (Sweden)

    Caprez Adam

    2011-01-01

    Full Text Available Abstract Background A recent analysis of protein sequences deposited in the NCBI RefSeq database indicates that ~8.5 million protein sequences are encoded in prokaryotic and eukaryotic genomes, where ~30% are explicitly annotated as "hypothetical" or "uncharacterized" protein. Our Comparison of Protein Active-Site Structures (CPASS v.2 database and software compares the sequence and structural characteristics of experimentally determined ligand binding sites to infer a functional relationship in the absence of global sequence or structure similarity. CPASS is an important component of our Functional Annotation Screening Technology by NMR (FAST-NMR protocol and has been successfully applied to aid the annotation of a number of proteins of unknown function. Findings We report a major upgrade to our CPASS software and database that significantly improves its broad utility. CPASS v.2 is designed with a layered architecture to increase flexibility and portability that also enables job distribution over the Open Science Grid (OSG to increase speed. Similarly, the CPASS interface was enhanced to provide more user flexibility in submitting a CPASS query. CPASS v.2 now allows for both automatic and manual definition of ligand-binding sites and permits pair-wise, one versus all, one versus list, or list versus list comparisons. Solvent accessible surface area, ligand root-mean square difference, and Cβ distances have been incorporated into the CPASS similarity function to improve the quality of the results. The CPASS database has also been updated. Conclusions CPASS v.2 is more than an order of magnitude faster than the original implementation, and allows for multiple simultaneous job submissions. Similarly, the CPASS database of ligand-defined binding sites has increased in size by ~ 38%, dramatically increasing the likelihood of a positive search result. The modification to the CPASS similarity function is effective in reducing CPASS similarity scores

  11. Complex Impedance Spectroscopic Properties of Ba3V2O8 Ceramics

    OpenAIRE

    Praveen Khatri; Banarji Behera; Srinivas, V.; R. N. P. Choudhary

    2008-01-01

    The polycrystalline sample of B a 3 V 2 O 8 was prepared by a high-temperature solid-state reaction technique. The effect of temperature on impedance parameters was studied using an impedance analyzer in a wide frequency range ( 1 0 2 - 1 0 6  Hz). The real and imaginary parts of complex impedance trace semicircles in the complex plane. The temperature-dependent plots reveal the presence of both bulk and grain boundary effects above 1 2 5 ∘ C. The bulk resistance of the material decreases wit...

  12. Diseño de un sistema de comunicaciones V2R

    OpenAIRE

    Casabo Gomi, Arnau

    2010-01-01

    Este Trabajo de Final de Carrera (TFC) tiene como objetivo el diseño y la realización de un sistema de comunicaciones V2R (Vehicle to Roadside), mediante tecnología Bluetooth que permita la comunicación entre vehículos e infraestructura viaria. Dicho sistema estará alimentado eléctricamente a través de placas solares que le darán autonomía y reducirán el impacto medioambiental. Estas comunicaciones inalámbricas forman parte de las denominadas redes cooperativas VANET (Vehicular Ad-Hoc Network...

  13. Phase relations in BaO-La2O3-V2O5 system

    International Nuclear Information System (INIS)

    The method of singular triangulation was applied to plot a diagram of phase ratios in the subsolidus range of the BaO-La2O3-V2O5 system. New ternary compounds of Ba2LaV3O11 and Ba3La40V12O93 compositions are found. X-ray diffraction characteristic and IR transmission spectra of these compounds are presented. Ba2LaV3O11 compound is melted at 1478±10 K

  14. Percolation superconductivity in the GaSb-V2Ga5 eutectic

    International Nuclear Information System (INIS)

    Temperature dependences of specific resistivity are investigated for an eutectic composition of GaSb + V2Ga5. It is revealed that at parallel directions of electric current and filamentary crystal growth the specimens regardless of their shape and size possess metallic conductivity and at T 4.1 K transform into a superconductivity state. Once current and crystal growth directions are perpendicular, specific resistivity of specimens is dependent on a relationship among the dimensions and within an interval of 4.1-300 K is of a semiconducting nature, and at 4.1 K decreases sharply. In some specimens the transition into a superconducting state is detected

  15. 'Devil's Staircase'-Type Phase Transition in NaV2O5 under High Pressure

    International Nuclear Information System (INIS)

    The 'devil's staircase'-type phase transition in the quarter-filled spin-ladder compound NaV2O 5 has been discovered at low temperature and high pressure by synchrotron radiation x-ray diffraction. A large number of transitions are found to successively take place among higher-order commensurate phases with 2a x 2b x zc type superstructures. The observed temperature and pressure dependence of modulation wave number qc, defined by 1/z, is well reproduced by the axial next nearest neighbor Ising model. The qc is suggested to reflect atomic displacements presumably coupled with charge ordering in this system

  16. Direct Detection of Dark Matter with MadDM v.2.0

    OpenAIRE

    Backovic, Mihailo; Kong, Kyoungchul; Martini, Antony(Centre for Cosmology, Particle Physics and Phenomenology (CP3), Université catholique de Louvain, Chemin du Cyclotron 2, B-1348, Louvain-la-Neuve, Belgium); Mattelaer, Olivier; Mohlabeng, Gopolang

    2015-01-01

    We present MadDM v.2.0, a numerical tool for dark matter physics in a generic model. This version is the next step towards the development of a fully automated framework for dark matter searches at the interface of collider physics, astro-physics and cosmology. It extends the capabilities of v.1.0 to perform calculations relevant to the direct detection of dark matter. These include calculations of spin-independent/spin-dependent nucleon scattering cross sections and nuclear recoil rates (as ...

  17. Record low temperature Mo doped V2O5 thermochromic thin films for optoelectronic applications

    Directory of Open Access Journals (Sweden)

    M. Nazemiyan

    2013-11-01

    Full Text Available Thermochromic properties of polycrystalline molybdenum doped vanadium pentoxide thin films grown by the spray pyrolysis technique were investigated. Tetragonal thin film structures of this system are grown. The transmittance spectral analysis with temperature indicates a record semiconductor-metal transition temperature of < 50oC. This critical temperature is approximately 1/3 to 1/6 of magnitude expected for V2O5 thin films. The resistance of the thermochromic thin film also underwent a transition or phase change as expected, a reduction from more than few mega ohms to less than kilo ohm regime indicating potential applications in optoelectronics.

  18. Solid rocket booster thrust vector control V-2 off-nominal testing

    Science.gov (United States)

    Pagan, B.

    1981-01-01

    The results of the V-2 off nominal test sequence performed on the space shuttle solid rocket booster thrust vector control (SRB TVC) system are reported. The TVC subsystem was subjected to 19 off nominal test conditions. The test sequence consisted of: 8 burp starts, 30 hot firings, 14 GN2 spin tests, and 3 servicing passive system tests. It is concluded that the TVC subsystem operated nominally in response to the given commands and test conditions. Test objectives, detail results, and data are included.

  19. Electron spin resonance study of Na_{1-x}Li_xV_2O_5

    OpenAIRE

    Lohmann, M.; von Nidda, H. -A. Krug; Loidl, A.; Morre, E.; Dischner, M.; Geibel, C

    1999-01-01

    We measured X-band electron-spin resonance of single crystalline sodium vanadate doped with lithium, Na_{1-x}Li_xV_2O_5 for 0 < x < 1.3% . The phase transition into a dimerized phase that is observed at 34 K in the undoped compound, was found to be strongly suppressed upon doping with lithium. The spin susceptibility was analyzed to determine the transition temperature and the energy gap with respect to the lithium content. The transition temperature Tsp is suppressed following a square depen...

  20. Optical properties of V2O3 in its whole phase diagram

    OpenAIRE

    Vecchio, I. Lo; Baldassarre, L.; D'apuzzo, F.; Limaj, O.; Nicoletti, D.; Perucchi, A.; Fan, L.; Metcalf, P.; Marsi, M.; Lupi, S.

    2015-01-01

    Vanadium sesquioxide V2O3 is considered a textbook example of Mott-Hubbard physics. In this paper we present an extended optical study of its whole temperature/doping phase diagram as obtained by doping the pure material with M=Cr or Ti atoms (V1-xMx)2O3. We reveal that its thermodynamically stable metallic and insulating phases, although macroscopically equivalent, show very different low-energy electrodynamics. The Cr and Ti doping drastically change both the antiferromagnetic gap and the p...

  1. Phase composition of the CaO-MgO-V2O5 system

    International Nuclear Information System (INIS)

    Phase composition and regions of phase equilibrium of phase diagram of CaO-MgO-V2O5 system in subsolidus region. The system phase diagram is characterized by 14 quasi-binary cross sections, 12 regions of three phase and 4 regions of two phase equilibrium Casub(1-x) Mgsub(x) (VO3)2 solid solution formation is shown where 0=0.50, of double calcium and manganese orthovanadate Casub(2.5+x) Mgsub(2-x)(VOsub(4))sub(3), where 0=0.25

  2. System Na3VO4-Na4V2O7-Na2WO4

    International Nuclear Information System (INIS)

    State diagrams of sodium-orthovanadate-sodium tungstate, sodium pyrovanadatesodium tungstate systems and crystallization surface of sodiumorthovanadate-sodium pyrovanadate-sodium tungstate system were studied. Na5VWO8 compound forms in sodium orthovanadate-sodium tungstate system in solid state. Congruently melting Na6V2WO11 compound forms in sodium pyrovanadate-sodium tungstate system. Liquidus diagram of sodium orthovanadate-sodium pyrovanadate-sodium tungstate system was constructed. Compositions and melting points of ternary eutectic points were determined. 4 refs.; 3 figs.; 3 tabs

  3. Vasopressin receptors V1a and V2 are not osmosensors

    DEFF Research Database (Denmark)

    Lykke, Kasper; Assentoft, Mette; Fenton, Robert A;

    2015-01-01

    in AQP4-dependent water permeability was observed, although osmotic challenges failed to mimic vasopressin-dependent V1aR-mediated internalization of AQP4. Direct monitoring of inositol phosphate (IP) production of V1aR-expressing COS-7 cells demonstrated an efficient vasopressin-dependent response....... The V1aR-dependent response was monitored indirectly via its effects on aquaporin 4 (AQP4) when heterologously expressed in Xenopus oocytes and V1aR and V2R function was directly monitored following heterologous expression in COS-7 cells. A tendency toward an osmotically induced, V1aR-mediated reduction...

  4. GSEVM v.2: MCMC software to analyse genetically structured environmental variance models

    DEFF Research Database (Denmark)

    Ibáñez-Escriche, N; Garcia, M; Sorensen, D

    2010-01-01

    This note provides a description of software that allows to fit Bayesian genetically structured variance models using Markov chain Monte Carlo (MCMC). The gsevm v.2 program was written in Fortran 90. The DOS and Unix executable programs, the user's guide, and some example files are freely available...... for research purposes at http://www.bdporc.irta.es/estudis.jsp. The main feature of the program is to compute Monte Carlo estimates of marginal posterior distributions of parameters of interest. The program is quite flexible, allowing the user to fit a variety of linear models at the level of the mean...

  5. Electrochemical and spectroscopic investigations of the K2SO4-V2O5 molten electrolyte

    DEFF Research Database (Denmark)

    Schmidt, Douglas S.; Winnick, Jack; Boghosian, Soghomon;

    1999-01-01

    A 60 mol % K(2)SO(4)J/40 mol % V2O5 molten salt mixture was tested for electrochemical activity to determine its propensity for sulfate transport. Results of cyclic voltammetry showed a high electrochemical activity due likely to the reduction and oxidation of bulk, as opposed to minor, species....... Most reductions and oxidations did not conform to diffusion-limited theory, and indicated the presence of shipping reactions. By Raman spectroscopy V(V) polymers were identified in the melt consisting predominantly of VO2(SO4)(3)(2-) and VO3- units, while VO2SO4- units were also detected. By reduction...

  6. t-channel factorization description of γγ->V1V2

    International Nuclear Information System (INIS)

    A t-channel factorization model is used to estimate cross sections for the processes γγ->V1V2. Whenever V=rho, the width of the rho has been included in the calculations. The channels γγ->rho0rho0, rho0phi, phiphi, ωω, rho0ω and rho+rho- are calculated for two quasi-real photons. Predictions are also given for the process γsup(*)γ->rho0rho0 for virtual photon mass squared Q22. Our results are consistent with all available experimental data. (orig.)

  7. Nuclear reactors

    International Nuclear Information System (INIS)

    A nuclear reactor has a large prompt negative temperature coefficient of reactivity. A reactor core assembly of a plurality of fluid-tight fuel elements is located within a water-filled tank. Each fuel element contains a solid homogeneous mixture of 50-79 w/o zirconium hydride, 20-50 w/o uranium and 0.5-1.5 W erbium. The uranium is not more than 20 percent enriched, and the ratio of hydrogen atoms to zirconium atoms is between 1.5:1 and 7:1. The core has a long lifetime, E.G., at least about 1200 days

  8. Nuclear reactors

    International Nuclear Information System (INIS)

    In a liquid cooled nuclear reactor, the combination is described for a single-walled vessel containing liquid coolant in which the reactor core is submerged, and a containment structure, primarily of material for shielding against radioactivity, surrounding at least the liquid-containing part of the vessel with clearance therebetween and having that surface thereof which faces the vessel make compatible with the liquid, thereby providing a leak jacket for the vessel. The structure is preferably a metal-lined concrete vault, and cooling means are provided for protecting the concrete against reaching a temperature at which damage would occur. (U.S.)

  9. Analysis of V2 antibody responses induced in vaccinees in the ALVAC/AIDSVAX HIV-1 vaccine efficacy trial.

    Science.gov (United States)

    Zolla-Pazner, Susan; deCamp, Allan C; Cardozo, Timothy; Karasavvas, Nicos; Gottardo, Raphael; Williams, Constance; Morris, Daryl E; Tomaras, Georgia; Rao, Mangala; Billings, Erik; Berman, Phillip; Shen, Xiaoying; Andrews, Charla; O'Connell, Robert J; Ngauy, Viseth; Nitayaphan, Sorachai; de Souza, Mark; Korber, Bette; Koup, Richard; Bailer, Robert T; Mascola, John R; Pinter, Abraham; Montefiori, David; Haynes, Barton F; Robb, Merlin L; Rerks-Ngarm, Supachai; Michael, Nelson L; Gilbert, Peter B; Kim, Jerome H

    2013-01-01

    The RV144 clinical trial of a prime/boost immunizing regimen using recombinant canary pox (ALVAC-HIV) and two gp120 proteins (AIDSVAX B and E) was previously shown to have a 31.2% efficacy rate. Plasma specimens from vaccine and placebo recipients were used in an extensive set of assays to identify correlates of HIV-1 infection risk. Of six primary variables that were studied, only one displayed a significant inverse correlation with risk of infection: the antibody (Ab) response to a fusion protein containing the V1 and V2 regions of gp120 (gp70-V1V2). This finding prompted a thorough examination of the results generated with the complete panel of 13 assays measuring various V2 Abs in the stored plasma used in the initial pilot studies and those used in the subsequent case-control study. The studies revealed that the ALVAC-HIV/AIDSVAX vaccine induced V2-specific Abs that cross-react with multiple HIV-1 subgroups and recognize both conformational and linear epitopes. The conformational epitope was present on gp70-V1V2, while the predominant linear V2 epitope mapped to residues 165-178, immediately N-terminal to the putative α4β7 binding motif in the mid-loop region of V2. Odds ratios (ORs) were calculated to compare the risk of infection with data from 12 V2 assays, and in 11 of these, the ORs were ≤1, reaching statistical significance for two of the variables: Ab responses to gp70-V1V2 and to overlapping V2 linear peptides. It remains to be determined whether anti-V2 Ab responses were directly responsible for the reduced infection rate in RV144 and whether anti-V2 Abs will prove to be important with other candidate HIV vaccines that show efficacy, however, the results support continued dissection of Ab responses to the V2 region which may illuminate mechanisms of protection from HIV-1 infection and may facilitate the development of an effective HIV-1 vaccine. PMID:23349725

  10. Analysis of V2 antibody responses induced in vaccinees in the ALVAC/AIDSVAX HIV-1 vaccine efficacy trial.

    Directory of Open Access Journals (Sweden)

    Susan Zolla-Pazner

    Full Text Available The RV144 clinical trial of a prime/boost immunizing regimen using recombinant canary pox (ALVAC-HIV and two gp120 proteins (AIDSVAX B and E was previously shown to have a 31.2% efficacy rate. Plasma specimens from vaccine and placebo recipients were used in an extensive set of assays to identify correlates of HIV-1 infection risk. Of six primary variables that were studied, only one displayed a significant inverse correlation with risk of infection: the antibody (Ab response to a fusion protein containing the V1 and V2 regions of gp120 (gp70-V1V2. This finding prompted a thorough examination of the results generated with the complete panel of 13 assays measuring various V2 Abs in the stored plasma used in the initial pilot studies and those used in the subsequent case-control study. The studies revealed that the ALVAC-HIV/AIDSVAX vaccine induced V2-specific Abs that cross-react with multiple HIV-1 subgroups and recognize both conformational and linear epitopes. The conformational epitope was present on gp70-V1V2, while the predominant linear V2 epitope mapped to residues 165-178, immediately N-terminal to the putative α4β7 binding motif in the mid-loop region of V2. Odds ratios (ORs were calculated to compare the risk of infection with data from 12 V2 assays, and in 11 of these, the ORs were ≤1, reaching statistical significance for two of the variables: Ab responses to gp70-V1V2 and to overlapping V2 linear peptides. It remains to be determined whether anti-V2 Ab responses were directly responsible for the reduced infection rate in RV144 and whether anti-V2 Abs will prove to be important with other candidate HIV vaccines that show efficacy, however, the results support continued dissection of Ab responses to the V2 region which may illuminate mechanisms of protection from HIV-1 infection and may facilitate the development of an effective HIV-1 vaccine.

  11. Nuclear reactor

    International Nuclear Information System (INIS)

    In an improved reactor core for a high conversion BWR reactor, Pu-breeding type BWR type reactor, Pu-breeding type BWR type rector, FEBR type reactor, etc., two types of fuel assemblies are loaded such that fuel assemblies using a channel box of a smaller irradiation deformation ratio are loaded in a high conversion region, while other fuel assemblies are loaded in a burner region. This enables to suppress the irradiation deformation within an allowable limit in the high conversion region where the fast neutron flux is high and the load weight from the inside of the channel box due to the pressure loss is large. At the same time, the irradiation deformation can be restricted within an allowable limit without deteriorating the neutron economy in the burner region in which fast neutron flux is low and the load weight from the inside of the channel box is small since a channel box with smaller neutron absorption cross section or reduced wall thickness is charged. As a result, it is possible to prevent structural deformations such as swelling of the channel box, bending of the entire assemblies, bending of fuel rods, etc. (K.M.)

  12. Effect of V2O5 on the dc conductivity of sodium bismuth borate glasses

    International Nuclear Information System (INIS)

    Transition metal doped quaternary glass system with composition 20Na2O-30Bi2O3-(50- x)B2O3-xV2O5 (where x = 0, 0.2, 0.3, 0.5, 2.0 mol%) has been prepared by normal melt-quench technique using analytical grade Na2CO3, Bi2O3, H3BO3, V2O5 chemicals. The main objective of present study is to investigate the effect of transition metal oxide on the conductivity mechanism of ternary alkali bismuth borate glasses. Density (D) and molar volume (VM) of each glass sample was calculated using Archimedes method. Differential scanning calorimetry (DSC) measurements were carried out at a heating rate of 10K/min for the determination of glass transition temperature Tg using Q10 DSC (TA Instruments). The values of dc conductivity and activation energy for conductivity and relaxation time have been calculated for all samples using sample dimensions. (author)

  13. Magnetic and Thermal Properties of TmV2Al20 Single Crystals

    Science.gov (United States)

    Lei, Qiankun; Namiki, Takahiro; Isikawa, Yosikazu; Nishimura, Katsuhiko; Hutchison, Wayne D.

    2016-03-01

    The magnetization and specific heat of TmV2Al20 single crystals were measured in the temperature range from 0.5 to 300 K in external magnetic fields up to 7 T. TmV2Al20 was found to be paramagnetic above 0.5 K. Clear magnetic anisotropy was observed along the three principal crystallographic axes in the field above 1 T at 0.5 K. The magnetically easy axis is along the [100] direction, and the hard axis is along the [111] direction. On cooling below 2 K in zero external field, the magnetic part of specific heat divided by temperature, Cmag/T, increases up to 6 J/mol K2 near 0.6 K. The magnetic entropy in zero field reaches R ln 5 near 10 K, suggesting that the ground state of Tm3+ ions is a nonmagnetic doublet state with the first excited state of a magnetic triplet state nearby (a pseudo-fivefold degenerate state). The experimental results were reproduced by the crystalline electric field calculations, and an energy level scheme was proposed. The enhanced value of Cmag/T in the lowest temperature region in zero field was explained by assuming an energy splitting of the doublet ground state.

  14. Heavy Fermion Superconductivity in Non-magnetic Cage Compound PrV2Al20

    Science.gov (United States)

    Matsumoto, Yosuke; Tsujimoto, Masaki; Tomita, Takahiro; Sakai, Akito; Nakatsuji, Satoru

    2016-02-01

    PrT2Al20 (T = Ti, V) are ideal systems to study the quadrupole Kondo effect and quantum criticality arising from orbital degrees of freedom. Both systems have the nonmagnetic cubic Γ3 crystal electric field ground doublet with the well separated excited state. In particular, PrV2Al20 exhibits anomalous metallic behavior above and below the multipolar ordering temperatures, reflecting the even stronger hybridization between f and conduction electrons possibly due to a proximity to a orbital quantum critical point. Here, we discuss the heavy fermion superconductivity (SC) of PrV2Al20 in detail. The SC appears at Tc = 0.05 K with the highly enhanced effective mass (m* /m0 ∼ 140) estimated using the temperature dependence of the upper critical field. In addition, large electronic specific heat coefficient of γ ∼ 0.9 J/mol K2 above Tc and the large specific heat jump at Tc of ΔC/Tc ∼ 0.3 J/mol K2 provide direct evidences of the heavy fermion SC. This observation indicates the first realization of the novel SC arising from the orbital fluctuation of the f electrons at ambient pressure.

  15. Channel modelling and performance analysis of V2I communication systems in blind bend scattering environments

    KAUST Repository

    Chelli, Ali

    2014-01-01

    In this paper, we derive a new geometrical blind bend scattering model for vehicle-to- infrastructure (V2I) communications. The proposed model takes into account single-bounce and double- bounce scattering stemming from fixed scatterers located on both sides of a curved street. Starting from the geometrical blind bend model, the exact expression of the angle of departure (AOD) is derived. Based on this expression, the probability density function (PDF) of the AOD and the Doppler power spectrum are determined. Analytical expressions for the channel gain and the temporal autocorrelation function (ACF) are provided under non-line-of-sight (NLOS) conditions. Additionally, we investigate the impact of the position of transmitting vehicle relatively to the receiving road-side unit on the channel statistics. Moreover, we study the performance of different digital modulations over a sum of singly and doubly scattered (SSDS) channel. Note that the proposed V2I channel model falls under the umbrella of SSDS channels since the transmitted signal undergoes a combination of single-bounce and double-bounce scattering. We study some characteristic quantities of SSDS channels and derive expressions for the average symbol error probability of several modulation schemes over SSDS channels with and without diversity combining. The validity of these analytical expressions is confirmed by computer-based simulations.

  16. Preliminary Geological Map of the Fortuna Tessera (V-2) Quadrangle, Venus

    Science.gov (United States)

    Ivanov, M. A.; Head, J. W.

    2009-01-01

    The Fortuna Tessera quadrangle (50-75 N, 0-60 E) is a large region of tessera [1] that includes the major portion of Fortuna and Laima Tesserae [2]. Near the western edge of the map area, Fortuna Tessera is in contact with the highest moun-tain belt on Venus, Maxwell Montes. Deformational belts of Sigrun-Manto Fossae (extensional structures) and Au ra Dorsa (contractional structures) separate the tessera regions. Highly deformed terrains correspond to elevated regions and mildly deformed units are with low-lying areas. The sets of features within the V-2 quadrangle permit us to address the following important questions: (1) the timing and processes of crustal thickening/thinning, (2) the nature and origin of tesserae and deformation belts and their relation to crustal thickening processes, (3) the existence or absence of major evolutionary trends of volcanism and tectonics. The key feature in all of these problems is the regional sequence of events. Here we present description of units that occur in the V-2 quadrangle, their regional correlation chart (Fig. 1), and preliminary geological map of the region (Fig. 2).

  17. Epigenetic modification of vomeronasal (V2r) precursor neurons by histone deacetylation.

    Science.gov (United States)

    Xia, J; Broad, K D; Emson, P C; Keverne, E B

    2010-09-01

    Vomeronasal neurons undergo continuous neurogenesis throughout development and adult life. These neurons originate as stem cells in the apical zone of the lumen of the vomeronasal organ (VNO) and are described as nestin-expressing glia-like progenitor cells (Murdoch and Roskams, 2008). They then migrate horizontally along the basal zone where they differentiate into functional VNO neurons (Kaba et al., 1988). We harvested progenitor cells from the adult VNO and, after 3-6 months of invitro culture, these VNO neurons remained in a stable undifferentiated state expressing nestin, beta-tubulin III and vomeronasal type 2 (V2r), but not vomeronasal type 1 (V1r) receptors. Application of histone-deacetylase inhibitors induced development of a neural phenotype that expressed V2r receptors, a down-regulation of nestin expression and no change in any specific genetic markers associated with glial cells. Treatment with valproic acid induced extensive changes in gene expression in the axon guidance pathway. The adult VNO is known to functionally adapt throughout life as a consequence of changes in both a mouse's physiological status and its social environment. These pluripotent cultured neurons may provide valuable insights into how changes in both physiology and environment, exert epigenetic effects on vomeronasal neurons as they undergo continuous neurogenesis and development throughout the life of a mouse. PMID:20594945

  18. Mapping polaronic states and lithiation gradients in individual V2O5 nanowires.

    Science.gov (United States)

    De Jesus, Luis R; Horrocks, Gregory A; Liang, Yufeng; Parija, Abhishek; Jaye, Cherno; Wangoh, Linda; Wang, Jian; Fischer, Daniel A; Piper, Louis F J; Prendergast, David; Banerjee, Sarbajit

    2016-01-01

    The rapid insertion and extraction of Li ions from a cathode material is imperative for the functioning of a Li-ion battery. In many cathode materials such as LiCoO2, lithiation proceeds through solid-solution formation, whereas in other materials such as LiFePO4 lithiation/delithiation is accompanied by a phase transition between Li-rich and Li-poor phases. We demonstrate using scanning transmission X-ray microscopy (STXM) that in individual nanowires of layered V2O5, lithiation gradients observed on Li-ion intercalation arise from electron localization and local structural polarization. Electrons localized on the V2O5 framework couple to local structural distortions, giving rise to small polarons that serves as a bottleneck for further Li-ion insertion. The stabilization of this polaron impedes equilibration of charge density across the nanowire and gives rise to distinctive domains. The enhancement in charge/discharge rates for this material on nanostructuring can be attributed to circumventing challenges with charge transport from polaron formation. PMID:27349567

  19. Optical constants and electrochromic properties of sol-gel V{2}O{5} thin films

    Science.gov (United States)

    Benmoussa, M.; Outzourhit, A.; Bennouna, A.; Ameziane, E. L.

    2005-03-01

    Vanadium pentoxide thin films are prepared by the sol-gel route by dissolving V{2}O{5} powder (99.5% purity) in H{2}O{2} solution. The solution is spin - coated on glass substrates for optical (UV-VIS-NIR) analysis, and on ITO-coated glass substrates for electrochromic measurements. The samples are then annealed at 150 ° C for 1 hour. The resulting films have a yellow-orange color, typical of polycrystalline V{2}O{5}. The optical and physical constants (n, α , Eg, the thickness d and the mean thickness inhomogeneity σ ) of the films are calculated using a simple and accurate method based on the transmission spectrum alone. Electrochromism of the films is studied using cyclic voltammetry (CV) in propylene carbonate solution containing 1 mol/1LiClO{4}. The films show reversible multichromism (yellow-green-blue) upon Li+ ion insertion/extraction. The absorbance of films colored at three different potentials is measured in the UV-VIS wavelength range, and this study shows that the changes in the optical absorption are consistent with the film color changes. Finally, the optical and electrochromic properties of the films prepared by this method are compared with those of the sputtered films already studied in our previous works.

  20. Monte Carlo and experimental dosimetric study of the mHDR-v2 brachytherapy source

    Directory of Open Access Journals (Sweden)

    Chandola Rakesh

    2010-01-01

    Full Text Available The conventional treatment planning system (TPS gives analytical calculations with ± 15 to 20% dose, which may lead to over exposure of critical organs or under dose of target. It is to obtain dose distribution parameters of nucletron high dose rate (HDR microselectron v2 (mHDR-v2 192 Ir brachytherapy source by experiment and by calculated study using Monte Carlo (MC EGSnrc code, and to find the similarity between them, and with any past study. To validate data, another MC GEANT4 study done in this work on the same source is also presented. Different software of the computer e.g. paint, excel, etc are employed for preparation of figures and graphs. The measured study of the source was done using an in-air ionization chamber, water phantom, and measurement set-up, while the calculated study was done by modeling the set up of the measured study by using the MC EGSnrc and GEANT4. Mean and probability are used in calculation of average values, and calculation of the uncertainties in result and discussion. The measured and calculated values of dose rate constant, radial dose function, and 2D anisotropy function were found to be in agreement with each other as well as with published data. The results of this study can be used as input to TPS.

  1. Cyclic softening of the Ti-10V-2Fe-3Al titanium alloy

    Energy Technology Data Exchange (ETDEWEB)

    Luquiau, D. [Univ. de Technologie de Compiegne (France). Dept. de Genie Mecanique; Feaugas, X. [Univ. de Technologie de Compiegne (France). Dept. de Genie Mecanique; Clavel, M. [Univ. de Technologie de Compiegne (France). Dept. de Genie Mecanique

    1997-03-31

    The {beta}-metastable Ti-10V-2Fe-3Al alloy is studied in low cycle fatigue (LCF) at room temperature. An acicular and two equiaxed {alpha}{sub p} structures aged at different temperatures were produced and specimens were tested under plastic strain control. The experimental results show that the Ti-10V-2Fe-3Al alloy softens cyclically. The amplitude of the softening is not affected by the microstructure and it decreases as the applied plastic strain increases. The investigations show that this phenomenon proceeds from a decrease in both the isotropic and the kinematic components of the stress. The deformation modes have been analyzed by transmission electron microscopy (TEM) after the cyclic softening stage. Homogeneous prismatic slip is mainly observed in the {alpha}-phase. Furthermore, abundant cross-slip of left angle a right angle dislocations and left angle c+a right angle slip are also observed. The kinematic decrease is associated with a process of grain-to-grain homogenization of yielding through the microstructure, and the isotropic softening with dislocations annihilation enhanced by cross-slip in the {alpha}-phase. Quantitative TEM analysis with regard to the crystallographic orientation of {alpha}{sub p} particles indicates that the decrease in the softening amplitude at high levels of the applied plastic strain must be related to the occurrence of left angle c+a right angle slip. (orig.)

  2. Study of hyperfine interactions in V2O3 by angular correlation

    International Nuclear Information System (INIS)

    The hyperfine interaction in v2O3 in function of temperature by measurements of time differential perturbed angular correlation is studied. The samples presented quadrupole interaction in the probe center, Cd111 immediatelly after sintering, when reduced in H2 flux at 8000C. A pure electric quadrupole interaction at the metallic phase and a combined interaction of magnetic dipole and electric quadrupole at the insulating antiferromagnetic phase, were observed. The electric field gradient undergoes abrupt variation at the metal-insulating transition at T=1600K from 8.2x1017v/cm2 at the insulating phase to 6.3x1017v/cm2 in the metallic phase, however varies smoothly with the temperature at T=4500K when variations in resistivity also occur. At metallic phase the electric field increases with the temperature enhacement. The hyperfine magnetic field of Cd111 at antiferromagnetic phase of V2O3 has a saturation value of 15(1) KOe and performes an angle of β=68(2)0 with the main component direction of electric field gradient. (M.C.K.)

  3. miTALOS v2: Analyzing Tissue Specific microRNA Function.

    Science.gov (United States)

    Preusse, Martin; Theis, Fabian J; Mueller, Nikola S

    2016-01-01

    MicroRNAs are involved in almost all biological processes and have emerged as regulators of signaling pathways. We show that miRNA target genes and pathway genes are not uniformly expressed across human tissues. To capture tissue specific effects, we developed a novel methodology for tissue specific pathway analysis of miRNAs. We incorporated the most recent and highest quality miRNA targeting data (TargetScan and StarBase), RNA-seq based gene expression data (EBI Expression Atlas) and multiple new pathway data sources to increase the biological relevance of the predicted miRNA-pathway associations. We identified new potential roles of miR-199a-3p, miR-199b-3p and the miR-200 family in hepatocellular carcinoma, involving the regulation of metastasis through MAPK and Wnt signaling. Also, an association of miR-571 and Notch signaling in liver fibrosis was proposed. To facilitate data update and future extensions of our tool, we developed a flexible database backend using the graph database neo4j. The new backend as well as the novel methodology were included in the updated miTALOS v2, a tool that provides insights into tissue specific miRNA regulation of biological pathways. miTALOS v2 is available at http://mips.helmholtz-muenchen.de/mitalos. PMID:26998997

  4. V2O5 xerogel-poly(ethylene oxide) hybrid material: Synthesis, characterization, and electrochemical properties

    International Nuclear Information System (INIS)

    In this work, we report the synthesis, characterization, and electrochemical properties of vanadium pentoxide xerogel-poly(ethylene oxide) (PEO) hybrid materials obtained by varying the average molecular weight of the organic component as well as the components' ratios. The materials were characterized by X-ray diffraction, ultraviolet/visible and infrared spectroscopies, thermogravimetric analysis, scanning electron microscopy, electron paramagnetic resonance, and cyclic voltammetry. Despite the presence of broad and low intensity peaks, the X-ray diffractograms indicate that the lamellar structure of the vanadium pentoxide xerogel is preserved, with increase in the interplanar spacing, giving evidence of a low-crystalline structure. We found that the electrochemical behaviour of the hybrid materials is quite similar to that found for the V2O5 xerogel alone, and we verified that PEO leads to stabilization and reproducibility of the Li+ electrochemical insertion/de-insertion into the V2O5 xerogel structure, which makes these materials potential components of lithium ion batteries. - Graphical abstract: The synthesis, structural and electrochemical properties of vanadium pentoxide xerogel-poly(ethylene oxide) hybrid materials have been described. Despite the presence of broad and low intensity peaks, the X-ray diffractograms indicate that the lamellar structure of the vanadium pentoxide xerogel is preserved. The cyclic voltammetry technique demonstrated that PEO intercalation provides an improvement in the electrochemical properties, mainly with respect to the lithium electroinsertion process into the oxide matrix

  5. Multithreaded transactions in scientific computing. The Growth06_v2 program

    Science.gov (United States)

    Daniluk, Andrzej

    2009-07-01

    Writing a concurrent program can be more difficult than writing a sequential program. Programmer needs to think about synchronization, race conditions and shared variables. Transactions help reduce the inconvenience of using threads. A transaction is an abstraction, which allows programmers to group a sequence of actions on the program into a logical, higher-level computation unit. This paper presents a new version of the GROWTHGr and GROWTH06 programs. New version program summaryProgram title: GROWTH06_v2 Catalogue identifier: ADVL_v2_1 Program summary URL:http://cpc.cs.qub.ac.uk/summaries/ADVL_v2_1.html Program obtainable from: CPC Program Library, Queen's University, Belfast, N. Ireland Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html No. of lines in distributed program, including test data, etc.: 65 255 No. of bytes in distributed program, including test data, etc.: 865 985 Distribution format: tar.gz Programming language: Object Pascal Computer: Pentium-based PC Operating system: Windows 9x, XP, NT, Vista RAM: more than 1 MB Classification: 4.3, 7.2, 6.2, 8, 14 Catalogue identifier of previous version: ADVL_v2_0 Journal reference of previous version: Comput. Phys. Comm. 175 (2006) 678 Does the new version supersede the previous version?: Yes Nature of problem: The programs compute the RHEED intensities during the growth of thin epitaxial structures prepared using the molecular beam epitaxy (MBE). The computations are based on the use of kinematical diffraction theory. Solution method: Epitaxial growth of thin films is modelled by a set of non-linear differential equations [1]. The Runge-Kutta method with adaptive stepsize control was used for solving initial value problem for non-linear differential equations [2]. Reasons for new version: According to the users' suggestions functionality of the program has been improved. Moreover, new use cases have been added which make the handling of the program easier and more

  6. Report of the ASSET (Assessment of Safety Significant Events Team) follow-up mission to the Bohunice (units 1-2) nuclear power plant in Slovakia 5-9 July 1993. Root cause analysis of operational events with a view to enhancing the prevention of accidents

    International Nuclear Information System (INIS)

    This Report of the IAEA Assessment of Safety Significant Events Team (ASSET) presents the results of the team's review of the status of implementation of the recommendations made by the 1988 ASSET mission to Bohunice nuclear power plant in Slovakia, and of progress made by plant management in prevention of incidents. The findings, conclusions and suggestions presented herein reflect the views of the ASSET experts. They are provided for consideration by the responsible Slovakian authorities. The ASSET team's views presented in this report are based on review of the documentation made available and on the discussions with plant staff. The report includes the official response of the operating and regulatory organizations of Slovakia to the ASSET findings and conclusions. Figs, tabs

  7. ESR Characterization and Activity of V2O5/γ-Al2O3 Catalysts for Dehydrogenation of Isobutane

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    The ESR spectra of catalyst V2O5/γ-Al2O3 and its activity for the dehydrogenation of isobutane were investigated. On the basis of the results of the ESR spectroscopy associated with the TPR results, it is suggested that there is a strong interaction between V2O5 and γ-Al2O3 and the V4+ species on the surface is the active center of catalyst V2O5/γ-Al2O3 for this reaction.

  8. One-step hydrothermal synthesis of graphene decorated V2O5 nanobelts for enhanced electrochemical energy storage

    OpenAIRE

    Minoh Lee; Suresh Kannan Balasingam; Hu Young Jeong; Hong, Won G.; Han-Bo-Ram Lee; Byung Hoon Kim; Yongseok Jun

    2015-01-01

    Graphene-decorated V2O5 nanobelts (GVNBs) were synthesized via a low-temperature hydrothermal method in a single step. V2O5 nanobelts (VNBs) were formed in the presence of graphene oxide, a mild oxidant, which also enhanced the conductivity of GVNBs. From the electron energy loss spectroscopy analysis, the reduced graphene oxide (rGO) are inserted into the layered crystal structure of V2O5 nanobelts, which further confirmed the enhanced conductivity of the nanobelts. The electrochemical energ...

  9. Angular Dependent Soft X-ray Absorption Spectroscopy of V2O5 and V6O13

    OpenAIRE

    Goering, E.; Müller, O.; Klemm, M.; Urbach, J. P.; Petersen, H; Jung, C; denBoer, M. L.; Horn, S.

    1994-01-01

    We have measured the V 2p3/2 and O 1s x-ray absorption spectra of single crystal V2O5 and V6O13 and compared to linear combinations of atomic orbitals (LCAO) density of states (DOS) calculations. The spectra change dramatically with incident angle. The use of polarized light and a single crystal limits the number of transitions possible, revealing spectral features that cannot be resolved on polycrystals (angle-integrated). The measured O 1s and V 2p3/2 spectra agree with the projected unoccu...

  10. Reset-sensing quasi-V2 single-inductor multiple-output buck converter with reduced cross-regulation

    OpenAIRE

    Lee, ATL; Tan, SC; Hui, SYR; Chan, PCH; Sin, JKO

    2015-01-01

    This paper proposes a reset-sensing quasi-V2 single-inductor multiple-output (SIMO) converter with minimal cross-regulation. The conventional quasi-V2 sensing scheme in SIMO converters suffers from serious cross-regulation which is primarily induced by the load differentiation with unbalanced loads. It is shown that the proposed reset-sensing quasi-V2 control scheme can significantly reduce cross-regulation by completely discharging the feed-forward sensing node to zero volts during the idle ...

  11. A Querying Method over RDF-ized Health Level Seven v2.5 Messages Using Life Science Knowledge Resources

    OpenAIRE

    KAWAZOE, YOSHIMASA; Imai,Takeshi; Ohe, Kazuhiko

    2016-01-01

    Background Health level seven version 2.5 (HL7 v2.5) is a widespread messaging standard for information exchange between clinical information systems. By applying Semantic Web technologies for handling HL7 v2.5 messages, it is possible to integrate large-scale clinical data with life science knowledge resources. Objective Showing feasibility of a querying method over large-scale resource description framework (RDF)-ized HL7 v2.5 messages using publicly available drug databases. Methods We dev...

  12. Proceedings of the third international conference on containment design and operation. v.2

    International Nuclear Information System (INIS)

    The third international conference on containment design and operation includes in volume 2 of the publication sessions on the following topics: structural analysis and response tests; passive safety systems; aerosol behaviour; containment reliability, integrity, and risk assessment; hydrogen deflagration and detonation. Due prominence was given to CANDU and other PHWR reactors. The individual papers have been abstracted separately

  13. Proceedings of the 1. General Congress of Nuclear Energy. v. 2

    International Nuclear Information System (INIS)

    The proceedings of I General Congress of Nuclear Energy are presented. All fields related to nuclear energy are enclosed. In the second part the following fields are shown: reactor instrumentation and control, nuclear medicine, radioisotopes uses, fuel cycle and radiation protection. (M.C.K.)

  14. Synaptic Vesicle Tethering and the CaV2.2 Distal C-terminal

    Directory of Open Access Journals (Sweden)

    Fiona K Wong

    2014-03-01

    Full Text Available . Evidence that synaptic vesicles (SVs can be gated by a single voltage sensitive calcium channel (CaV2.2 predict a molecular linking mechanism or ‘tether’[Stanley 1993]. Recent studies have proposed that the SV binds to the distal C-terminal on the CaV2.2 calcium channel [Kaeser et al. 2011;Wong, Li, and Stanley 2013] while genetic analysis proposed a double tether mechanism via RIM: directly to the C terminus PDZ ligand domain or indirectly via a more proximal proline rich site [Kaeser et al. 2011]. Using a novel in vitro SV-PD binding assay, we reported that SVs bind to a fusion protein comprising the C-terminal distal third (C3, aa 2137-2357 [Wong, Li, and Stanley 2013]. Here we limit the binding site further to the last 58 aa, beyond the proline rich site, by the absence of SV capture by a truncated C3 fusion protein (aa 2137-2299. To test PDZ-dependent binding we generated two C terminus-mutant C3 fusion proteins and a mimetic blocking peptide (H-WC, aa 2349-2357 and validated these by elimination of MINT-1 or RIM binding. Persistence of SV capture with all three fusion proteins or with the full length C3 protein but in the presence of the blocking peptide, demonstrated that SVs can bind to the distal C-terminal via a PDZ-independent mechanism. These results were supported in situ by normal SV turnover in H-WC-loaded synaptosomes, as assayed by a novel peptide cryoloading method. Thus, SVs tether to the CaV2.2 C-terminal within a 49 aa region immediately prior to the terminus PDZ ligand domain. Long tethers that could reflect extended C termini were imaged by electron microscopy of synaptosome ghosts. To fully account for SV tethering we propose a model where SVs are initially captured, or ‘grabbed’, from the cytoplasm by a binding site on the distal region of the channel C-terminal and are then retracted to be ‘locked’ close to the channel by a second attachment mechanism in preparation for single channel domain gating.

  15. Potential range land for grazing cattle in the United States Pacific Northwest summarized for NHDPlus v2 catchments

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This spatial data set was created by the U.S. Geological Survey (USGS) to represent the area of land within each incremental watershed delineated in the NHDPlus v2...

  16. Reactor container

    International Nuclear Information System (INIS)

    A reactor container has a suppression chamber partitioned by concrete side walls, a reactor pedestal and a diaphragm floor. A plurality of partitioning walls are disposed in circumferential direction each at an interval inside the suppression chamber, so that independent chambers in a state being divided into plurality are formed inside the suppression chamber. The partition walls are formed from the bottom portion of the suppression chamber up to the diaphragm floor to isolate pool water in a divided state. Operation platforms are formed above the suppression chamber and connected to an access port. Upon conducting maintenance, inspection or repairing, a pump is disposed in the independent chamber to transfer pool water therein to one or a plurality of other independent chambers to make it vacant. (I.N.)

  17. Reactor building

    International Nuclear Information System (INIS)

    The present invention concerns a structure of ABWR-type reactor buildings, which can increase the capacity of a spent fuel storage area at a low cost and improved earthquake proofness. In the reactor building, the floor of a spent fuel pool is made flat, and a depth of the pool water satisfying requirement for shielding is ensured. In addition, a depth of pool water is also maintained for a equipment provisionally storing pool for storing spent fuels, and a capacity for a spent fuel storage area is increased by utilizing surplus space of the equipment provisionally storing pool. Since the flattened floor of the spent fuel pool is flushed with the floor of the equipment provisionally storing pool, transfer of horizontal loads applied to the building upon occurrence of earthquakes is made smooth, to improve earthquake proofness of the building. (T.M.)

  18. Nuclear reactors

    International Nuclear Information System (INIS)

    Disclosed is a nuclear reactor cooled by a freezable liquid has a vessel for containing said liquid and comprising a structure shaped as a container, and cooling means in the region of the surface of said structure for effecting freezing of said liquid coolant at and for a finite distance from said surface for providing a layer of frozen coolant on and supported by said surface for containing said liquid coolant. In a specific example, where the reactor is sodium-cooled, the said structure is a metal-lined concrete vault, cooling is effected by closed cooling loops containing NaK, the loops extending over the lined surface of the concrete vault with outward and reverse pipe runs of each loop separated by thermal insulation, and air is flowed through cooling pipes embedded in the concrete behind the metal lining. 7 claims, 3 figures

  19. A Hybrid Flight Control for a Simulated Raptor-30 V2 Helicopter

    Directory of Open Access Journals (Sweden)

    Arbab Nighat Khizer

    2015-04-01

    Full Text Available This paper presents a hybrid flight control system for a single rotor simulated Raptor-30 V2 helicopter. Hybrid intelligent control system, combination of the conventional and intelligent control methodologies, is applied to small model helicopter. The proposed hybrid control used PID as a traditional control and fuzzy as an intelligent control so as to take the maximum advantage of advanced control theory. The helicopter?s model used; comes from X-Plane flight simulator and their hybrid flight control system was simulated using MATLAB/SIMULINK in a simulation platform. X-Plane is also used to visualize the performance of this proposed autopilot design. Through a series of numerous experiments, the operation of hybrid control system was investigated. Results verified that the proposed hybrid control has an excellent performance at hovering flight mode.

  20. A hybrid flight control for a simulated raptor-30 v2 helicopter

    International Nuclear Information System (INIS)

    This paper presents a hybrid flight control system for a single rotor simulated Raptor-30 V2 helicopter. Hybrid intelligent control system, combination of the conventional and intelligent control methodologies, is applied to small model helicopter. The proposed hybrid control used PID as a traditional control and fuzzy as an intelligent control so as to take the maximum advantage of advanced control theory. The helicopter model used; comes from X-Plane flight simulator and their hybrid flight control system was simulated using MATLAB/SIMULINK in a simulation platform. X-Plane is also used to visualize the performance of this proposed autopilot design. Through a series of numerous experiments, the operation of hybrid control system was investigated. Results verified that the proposed hybrid control has an excellent performance at hovering flight mode. (author)

  1. V2S: Voice to Sign Language Translation System for Malaysian Deaf People

    Science.gov (United States)

    Mean Foong, Oi; Low, Tang Jung; La, Wai Wan

    The process of learning and understand the sign language may be cumbersome to some, and therefore, this paper proposes a solution to this problem by providing a voice (English Language) to sign language translation system using Speech and Image processing technique. Speech processing which includes Speech Recognition is the study of recognizing the words being spoken, regardless of whom the speaker is. This project uses template-based recognition as the main approach in which the V2S system first needs to be trained with speech pattern based on some generic spectral parameter set. These spectral parameter set will then be stored as template in a database. The system will perform the recognition process through matching the parameter set of the input speech with the stored templates to finally display the sign language in video format. Empirical results show that the system has 80.3% recognition rate.

  2. Multi-Kinect v2 Camera Based Monitoring System for Radiotherapy Patient Safety.

    Science.gov (United States)

    Santhanam, Anand P; Min, Yugang; Kupelian, Patrick; Low, Daniel

    2016-01-01

    3D kinect camera systems are essential for real-time imaging of 3D treatment space that consists of both the patient anatomy as well as the treatment equipment setup. In this paper, we present the technical details of a 3D treatment room monitoring system that employs a scalable number of calibrated and coregistered Kinect v2 cameras. The monitoring system tracks radiation gantry and treatment couch positions, and tracks the patient and immobilization accessories. The number and positions of the cameras were selected to avoid line-of-sight issues and to adequately cover the treatment setup. The cameras were calibrated with a calibration error of 0.1 mm. Our tracking system evaluation show that both gantry and patient motion could be acquired at a rate of 30 frames per second. The transformations between the cameras yielded a 3D treatment space accuracy of < 2 mm error in a radiotherapy setup within 500mm around the isocenter. PMID:27046604

  3. Phase Structural Characteristics of ZrV2 Thin Film Prepared by Magnetron Sputtering

    Institute of Scientific and Technical Information of China (English)

    XU Shi-Lin; SHI Li-Qun

    2005-01-01

    @@ The thin film metal hydride has become an emerging field of research in metal hydride batteries for its good mechanical and hydrogenation properties. ZrV2 thin films have been prepared using a dc magnetron sputtering method, and the phase structure is investigated. Only amorphous or crystalline Zr and V mixture phases are achieved when substrates are heated during either to 400℃ or to 550 ℃. The annealing causes segregation of Zr and V in the film induced by strain-driven diffusion and interdiffusion between substrate Mo and film elements at high temperature, which results in the formation of mixture phases of C14, C15, Zr and V, but the content of C15 phase is not higher compared with that in the bulk material.

  4. Competition between the inter- and intra-sublattice interactions in Yb2V2O7

    Science.gov (United States)

    Dun, Zhiling; Ma, Jie; Cao, Huibo; Hong, Tao; Matsuda, Masaaki; Qiu, Yiming; Copley, John; Cheng, Jinguang; Lee, Minseong; Choi, Eunsang; Johnston, Steve; Zhou, Haidong

    2015-03-01

    We studied single crystals of Yb2V2O7 using dc and ac susceptibility measurements, elastic and inelastic neutron scattering measurements, and linear spin wave theory. The experimental data shows a ferromagnetic ordering of V4+ ions at 70 K, a short-range ordering of Yb3+ ions below 40 K, and finally a long-range non-collinear ordering of Yb3+ ions below 15 K. With external magnetic field oriented along the [111] axis, the Yb-sublattice experiences a spin flop transition related to the ``three-in one-out'' spin structure. By modeling the spin wave excitations, we extract the Hamiltonian parameters. Our results confirm that although the extra inter-sublattice Yb-V interactions dramatically increases the Yb ordering temperature to 15 K, the intra-sublattice Yb-Yb interactions, based on the pyrochlore lattice, still stabilize the Yb ions' non-collinear spin structure and spin flop transition.

  5. Thickness Measurement of V2O5 Nanometric Thin Films Using a Portable XRF

    Directory of Open Access Journals (Sweden)

    Fabio Lopes

    2016-01-01

    Full Text Available Nanometric thin films have always been chiefly used for decoration; however they are now being widely used as the basis of high technology. Among the various physical qualities that characterize them, the thickness strongly influences their properties. Thus, a new procedure is hereby proposed and developed for determining the thickness of V2O5 nanometric thin films deposited on the glass surface using Portable X-Ray Fluorescence (PXRF equipment and the attenuation of the radiation intensity Kα of calcium present in the glass. It is shown through the present paper that the radiation intensity of calcium Kα rays is proportional to film thickness in nanometric films of vanadium deposited on the glass surface.

  6. Ion beam sputter deposition of V 2O 5 thin films

    Science.gov (United States)

    Gallasch, T.; Stockhoff, T.; Baither, D.; Schmitz, G.

    V 2O 5 thin films were deposited by means of dc-ion beam sputtering. To determine the influence of various deposition parameters, samples were characterized by X-ray diffractometry and transmission electron microscopy. Using electron energy loss spectroscopy, the oxidation state of vanadium was quantified based on the chemical shift of absorption edges. Measurement of in-plane direct current showed that the electronic conductivity varies over several orders of magnitude depending on the preparation conditions. The desired structure suitable for battery applications is achieved by sputtering under partial pressure of oxygen and suitable post-annealing under ambient atmosphere. Reversible intercalation of Li into the produced thin films was demonstrated.

  7. The QCD heavy-quark potential to order $v^{2} one loop matching conditions

    CERN Document Server

    Manohar, A V; Manohar, Aneesh V.; Stewart, Iain W.

    2000-01-01

    The one-loop QCD heavy quark potential is computed to order v^2 in the colorsinglet and octet channels. Several errors in the previous literature arecorrected. To be consistent with the velocity power counting, the fulldependence on |p' + p|/|p' - p| is kept. The matching conditions for the NRQCDone-loop potential are computed by comparing the QCD calculation with that inthe effective theory. The graphs in the effective theory are also compared toterms from the hard, soft, potential, and ultrasoft regimes in the thresholdexpansion. The issue of off-shell versus on-shell matching and gauge dependenceis discussed in detail for the 1/(m k) term in the potential. Matching on-shellgives a 1/(m k) potential that is gauge independent and does not vanish forQED.

  8. Environmental cracking of the alpha-beta titanium alloy, Ti-6Al-6V-2Sn

    International Nuclear Information System (INIS)

    The combined effects of environment, yield strength and stress state on the cracking susceptibility of beta-extruded Ti-6Al-6V-2Sn have been examined. At a constant yield strength and under plane strain conditions, the stress intensity required for slow crack propagation decreased as the severity of the environment increased, i.e., from laboratory air to 3.5% NaCl. Furthermore, the crack propagation rates were a function of both stress intensity, and environmental severity. Although the fracture toughness and threshold stress intensities for slow crack growth generally decreased with increasing yield strength, aging, which resulted in the precipitation of ordered Ti3Al particles in the primary alpha phase, tended to accentuate the susceptibility of this alloy to sustained load/stress corrosion cracking. Finally, at constant yield strength, the sustained load cracking threshold stress intensity was a function of stress state

  9. PERFORMANCE COMPARISON OF POSITION-BASED ROUTING PROTOCOLS IN VEHICLE-TOVEHICLE (V2V COMMUNICATION

    Directory of Open Access Journals (Sweden)

    SANJOY DAS

    2011-01-01

    Full Text Available Vehicular Ad hoc Networks (VANETs is the new wireless networking concept of the wireless ad hoc networks in the research community. Vehicle-to-Vehicle (V2V communication plays a significant role in providing a high level of safety and convenience to drivers and passengers. Routing in VANET is a major challenge and research area. Position based routing protocol has been identified to be suitable for VANETs because of frequently changed network topology and highly dynamic nature of vehicular nodes. Many position based routing protocols have been developed for routing messages in greedy orwarding way in VANETs. However, few of them are efficient when the network is highly dynamic. In this paper, we present an overview andqualitative comparison of existing position based routing protocols that are based on the position prediction of neighboring and destination nodes. We evaluate the performance metrics such as end-to-end delay and packet delivery ratio using NS-2 simulator.

  10. NEUTRONIC REACTORS

    Science.gov (United States)

    Anderson, J.B.

    1960-01-01

    A reactor is described which comprises a tank, a plurality of coaxial steel sleeves in the tank, a mass of water in the tank, and wire grids in abutting relationship within a plurality of elongated parallel channels within the steel sleeves, the wire being provided with a plurality of bends in the same plane forming adjacent parallel sections between bends, and the sections of adjacent grids being normally disposed relative to each other.

  11. Nuclear reactor

    International Nuclear Information System (INIS)

    The liquid metal (sodium) cooled fast breeder reactor has got fuel subassemblies which are bundled and enclosed by a common can. In order to reduce bending of the sides of the can because of the load caused by the coolant pressure the can has got a dodecagon-shaped crosssection. The surfaces of the can may be of equal width. One out of two surfaces may also be convex towards the center. (RW)

  12. Phase stability and defect structure of the C15 Laves phase Nb(Cr,V)2

    International Nuclear Information System (INIS)

    Vanadium alloyed C15 Laves phase based on NbCr2 and phase equilibria in the Nb-Cr-V system have been studied, focusing on the physical metallurgy and defect structures of the C15 phase.Based on the Nb-Cr-V phase diagram established in this work, the defect structure/mechanism in the ternary C15 Laves phase is investigated using a combination of metallography, SEM/EDS, TEM/ALCHEMI, and X-ray powder diffraction. It is found that the C15 phase field of NbCr2 is extended by V alloying up to more than 3 at.% V and V substitutes exclusively on the Cr site instead of the Nb site, although the atomic sizes of the constituent elements indicate rCr V Nb. The lattice constants of the ternary C15 phase Nb(Cr,V)2 increase linearly with increasing V content. The electronic structure and total energy of the C15 intermetallic phase NbCr2 have been calculated using the linear muffin tin orbital (LMTO) method with the atomic sphere approximation (ASA). The electronic band structure and density of electronic states were obtained. The formation and stability of the ternary C15 Laves phase Nb(Cr,V)2, the defect structure/mechanism, and the compositional dependence of the lattice constants are elucidated using a combination of geometric and electronic considerations. These results indicate that the electronic factor may also play an important role, in addition to the atomic size rule, in determining the alloying behavior and the defect structure/mechanism of C15 Laves phases based on NbCr2

  13. New Methods for Modeling and Monitoring Wildfires Using Multiple Data Sources: Smartfire v2

    Science.gov (United States)

    Raffuse, S. M.; Larkin, N. K.; Pryden, D. A.; Dedecko, T. M.

    2011-12-01

    While forest and other wildland fires may be naturally beneficial to the ecosystem, they can be catastrophic from the human perspective. To detect, monitor, and map wildland fires, satellite observations have been used for many years, and multiple satellite-derived products with various attributes (hot spot detection vs. burn scar, polar orbiting vs. geostationary, etc.) have been developed. Each product provides something useful that might not be available from the others. In some jurisdictions, land management agencies also provide useful fire information from ground reports and aircraft surveillance. The Smartfire system was originally developed in 2007 to combine fire activity data from satellite observations and ground reports into a single reconciled data set of best available fire activity in near real-time. Smartfire v1 combines satellite observations from the National Oceanic and Atmospheric Administration's Hazard Mapping System and ground reports from the National Interagency Fire Center. Smartfire v1 has been used for real-time fire and smoke modeling and for developing the wildland fire emissions inventory for the U.S. Environmental Protection Agency. Smartfire has also proven beneficial during emergencies when rapid response is needed, such as large wildfires with impacts on residential areas. The Smartfire system has been comprehensively redesigned to be more flexible, expandable, and accurate. Smartfire v2 provides a framework that intelligently combines an indefinite number of fire information data sources into custom-reconciled data streams for modeling, monitoring, emergency response, retrospective analysis, and emissions inventory development. We will present an overview of Smartfire v2 and assess how well it performs using only data sets available in near-real time.

  14. Nuclear reactor

    International Nuclear Information System (INIS)

    A detector having high sensitivity to fast neutrons and having low sensitivity to thermal neutrons is disposed for reducing influences of neutron detector signals on detection values of neutron fluxes when the upper end of control rod pass in the vicinity of the neutron flux detector. Namely, the change of the neutron fluxes is greater in the thermal neutron energy region while it is smaller in the fast neutron energy region. This is because the neutron absorbing cross section of B-10 used as neutron absorbers of control rods is greater in the thermal neutron region and it is smaller in the fast neutron region. As a result, increase of the neutron detection signals along with the local neutron flux change can be reduced, and detection signals corresponding to the reactor power can be obtained. Even when gang withdrawal of operating a plurality of control rods at the same time is performed, the reactor operation cycle can be measured accurately, thereby enabling to shorten the reactor startup time. (N.H.)

  15. Comparative study of the thermal and redox behaviour of alkali-promoted V2O5 catalysts

    International Nuclear Information System (INIS)

    Alkali-promoted V2O5 catalysts M-V2O5 (M=Li, Na, K, Rb and Cs) synthesised by impregnation of V2O5 with alkali sulfate solution have been investigated under inert and reducing atmosphere using thermoanalytical methods (TG/DTA, differential scanning calorimetry (DSC) and temperature-programmed reduction (TPR)). Pure V2O5 was used for comparison. Whereas in Li- and Na-promoted catalysts only V2O5 as crystalline phase could be detected by X-ray diffraction (XRD), the K-, Rb-, and Cs-promoted catalysts additionally contain the vanadate phase MV3O8. The surface acidity (Broensted- and Lewis-sites) as well as the starting temperature of the hydrogen consumption decrease with increasing size of the alkali cation. The reduction of the K-, Rb-, and Cs-promoted catalysts leads to the formation of bronze-like phases besides V2O5 at relative low temperatures. The bronze phases stabilise the V4+ oxidation state and improve the redox properties. A characteristic splitting and shifting of the ν(V=O) mode in the FTIR spectrum indicates the formation of V4+ in the different bronze phases. The favoured formation of bronze-like phases especially under reducing conditions enhances the release of SO2 at lower temperatures, the formation of H2S can be neglected

  16. Effects of process parameters on the optical constants of highly textured V2O5 thin films

    Science.gov (United States)

    Atuchin, V. V.; Kochubey, V. A.; Pokrovsky, L. D.; Kruchinin, V. N.; Ramana, C. V.

    2014-09-01

    The optical properties of the highly-textured V2O5 thin-films grown on Si(100) by sputter-deposition at various oxygen reactive-pressures were investigated in detail. The profiles of the optical constants, namely the refractive index and extinction coefficient, of V2O5 films were evaluated in the photon-energy range of 1-5 eV. At photon-energy above 2.5 eV, the dispersion behavior in optical constants is explained based on Lorentz-Drude model. The refractive index dispersion fits to a Cauchy's relation at photon-energy below 2.5 eV, where the V2O5-film is mostly transparent. The optical transitions across the bandgap occur at energy ˜2.5-3.2 eV depending on the V2O5 growth conditions and film-microstructure. The highly-textured and c-axis oriented V2O5-films, fabricated under optimum conditions of temperature and oxygen partial pressure, exhibit excellent optical characteristics similar to V2O5 single crystals.

  17. Hydrothermal Synthesis of Silver Vanadium Oxide (Ag0.35V2O5) Nanobelts for Sensing Amines

    Science.gov (United States)

    Fu, Haitao; Xie, Hui; Yang, Xiaohong; An, Xizhong; Jiang, Xuchuan; Yu, Aibing

    2015-10-01

    A simple hydrothermal method for the synthesis of Ag0.35V2O5 nanobelts with the assistance of sodium dodecyl sulfate (SDS) is reported in this study. The experimental variables that may affect the nanoparticle structures were investigated. And several advanced techniques, such as TEM, HRTEM, X-ray diffraction (XRD), were used to characterize the morphology and composition of the as-prepared nanobelts. The mechanism of the formation and growth of Ag0.35V2O5 nanobelts was also investigated and discussed. The results show that SDS, as a weak reducing agent, plays a crucial role in the formation of Ag0.35V2O5. According to N2 sorption isothermals, the as-prepared Ag0.35V2O5 nanobelts are found to exhibit relative high surface area. The gas sensing performance of the Ag0.35V2O5 nanobelts towards organic amine was tested. It is found that the nanobelts show superior sensitivity of amine(s) to V2O5 particles, lower detection limit (5 ppm), and higher selectivity of amine versus ammonia at an optimized working temperature of ~260 °C. Moreover, the density functional theory (DFT) simulation was conducted to better understand the sensing mechanism. These findings may be useful in designing promising materials to detect amine gases for medical or food industrial applications.

  18. Synthesis and Electrochemical Performance of the Na3V2(PO4)3 Cathode for Sodium-Ion Batteries

    Science.gov (United States)

    Van Nghia, Nguyen; Jafian, Samuel; Hung, I.-Ming

    2016-05-01

    Rhombohedral Na3V2(PO4)3 with a Na+ superionic conductor structure was synthesized using a solid-state reaction method. Citric acid was used as a carbon resource for carbon-thermal reduction reaction to reduce the oxidation state of vanadium. The shape of Na3V2(PO4)3 particles is irregular and its average diameter is in the range 30-50 nm. The Na3V2(PO4)3 exhibits a superior cycling ability and rate capability. The discharge capacity retains 74.3% of the discharge capacity of its first cycle with coulombic efficiency of 99.3% after 100 cycles. The discharge capacity of Na3V2(PO4)3 at 10 C is 48.87 mAh g-1, which is 58.4% of the cell cycled at 0.1 C. Furthermore, the structure of Na3V2(PO4)3 is stable for a considerable amount of Na+ ions (2 mol of Na+ ions) insertion and extraction with only 0.42% difference of unit-cell volume between fully charged and discharged states. Na3V2(PO4)3 is a potential cathode material for sodium-ion battery applications.

  19. Structure of HIV-1 gp120 V1/V2 domain with broadly neutralizing antibody PG9

    Energy Technology Data Exchange (ETDEWEB)

    McLellan, Jason S.; Pancera, Marie; Carrico, Chris; Gorman, Jason; Julien, Jean-Philippe; Khayat, Reza; Louder, Robert; Pejchal, Robert; Sastry, Mallika; Dai, Kaifan; O’Dell, Sijy; Patel, Nikita; Shahzad-ul-Hussan, Syed; Yang, Yongping; Zhang, Baoshan; Zhou, Tongqing; Zhu, Jiang; Boyington, Jeffrey C.; Chuang, Gwo-Yu; Diwanji, Devan; Georgiev, Ivelin; Kwon, Young Do; Lee, Doyung; Louder, Mark K.; Moquin, Stephanie; Schmidt, Stephen D.; Yang, Zhi-Yong; Bonsignori, Mattia; Crump, John A.; Kapiga, Saidi H.; Sam, Noel E.; Haynes, Barton F.; Burton, Dennis R.; Koff, Wayne C.; Walker, Laura M.; Phogat, Sanjay; Wyatt, Richard; Orwenyo, Jared; Wang, Lai-Xi; Arthos, James; Bewley, Carole A.; Mascola, John R.; Nabel, Gary J.; Schief, William R.; Ward, Andrew B.; Wilson, Ian A.; Kwong, Peter D. (UWASH); (NIH); (Scripps); (Duke); (IAVI); (Maryland-MED)

    2012-12-13

    Variable regions 1 and 2 (V1/V2) of human immunodeficiency virus-1 (HIV-1) gp120 envelope glycoprotein are critical for viral evasion of antibody neutralization, and are themselves protected by extraordinary sequence diversity and N-linked glycosylation. Human antibodies such as PG9 nonetheless engage V1/V2 and neutralize 80% of HIV-1 isolates. Here we report the structure of V1/V2 in complex with PG9. V1/V2 forms a four-stranded {beta}-sheet domain, in which sequence diversity and glycosylation are largely segregated to strand-connecting loops. PG9 recognition involves electrostatic, sequence-independent and glycan interactions: the latter account for over half the interactive surface but are of sufficiently weak affinity to avoid autoreactivity. The structures of V1/V2-directed antibodies CH04 and PGT145 indicate that they share a common mode of glycan penetration by extended anionic loops. In addition to structurally defining V1/V2, the results thus identify a paradigm of antibody recognition for highly glycosylated antigens, which - with PG9 - involves a site of vulnerability comprising just two glycans and a strand.

  20. Preparation and characterization of the TiO2-V2O5 photocatalyst with visible-light activity

    Institute of Scientific and Technical Information of China (English)

    LIU Jianhua; YANG Rong; LI Songmei

    2006-01-01

    Visible-light responsive TiO2-V2O5 catalyst was prepared using a binary sol-gel and in-situ intercalation method.The TiO2 sol and V2O5 sol were mixed to disperse the V2O5 species in the TiO2 phase at molecular level. The binary sol was then intercalated into interspaces of polyaniline (PANI) by means of in-situ polymerization of aniline. Conglomeration of the TiO2-V2O5 clusters during the calcination process was avoided because of the wrap of polyaniline. The surface morphology, the crystal phases, the stmcture, and the absorption spectra of (PANI)n/TiO2-V2O5 and the composite catalyst were studied using SEM, XRD, FI-IR, and UV-Vis. The photoactivity of the prepared catalyst under UV and visible light irradiation were evaluated by decolorization of methylene blue (MB) solution. The results showed that the composite catalyst displayed a homogeneous anatase phase, and the vanadium pentoxide species was highly dispersed in the TiO2 phase. The composite catalyst responded to visible light because of the narrowed band gap. In this study, the catalyst with the sol volume ratio of TiO2: V2O5 = 10:1 presented the best photocatalytic activity.

  1. Structures of HIV-1-Env V1V2 with broadly neutralizing antibodies reveal commonalities that enable vaccine design

    Science.gov (United States)

    Gorman, Jason; Soto, Cinque; Yang, Max M.; Davenport, Thaddeus M.; Guttman, Miklos; Bailer, Robert T.; Chambers, Michael; Chuang, Gwo-Yu; DeKosky, Brandon J.; Doria-Rose, Nicole A.; Druz, Aliaksandr; Ernandes, Michael J.; Georgiev, Ivelin S.; Jarosinski, Marissa C.; Joyce, M. Gordon; Lemmin, Thomas M.; Leung, Sherman; Louder, Mark K.; McDaniel, Jonathan R.; Narpala, Sandeep; Pancera, Marie; Stuckey, Jonathan; Wu, Xueling; Yang, Yongping; Zhang, Baoshan; Zhou, Tongqing; Mullikin, James C.; Baxa, Ulrich; Georgiou, George; McDermott, Adrian B.; Bonsignori, Mattia; Haynes, Barton F.; Moore, Penny L.; Morris, Lynn; Lee, Kelly K.; Shapiro, Lawrence; Mascola, John R.; Kwong, Peter D.

    2016-01-01

    Broadly neutralizing antibodies (bNAbs) against HIV-1-Env V1V2 arise in multiple donors. However, atomic-level interactions had only been determined with antibodies from a single donor, making commonalities in recognition uncertain. Here we report the co-crystal structure of V1V2 with antibody CH03 from a second donor and model Env interactions of antibody CAP256-VRC26 from a third. These V1V2-directed bNAbs utilized strand-strand interactions between a protruding antibody loop and a V1V2 strand, but differed in their N-glycan recognition. Ontogeny analysis indicated protruding loops to develop early, with glycan interactions maturing over time. Altogether, the multidonor information suggested V1V2-directed bNAbs to form an ‘extended class’, for which we engineered ontogeny-specific antigens: Env trimers with chimeric V1V2s that interacted with inferred ancestor and intermediate antibodies. The ontogeny-based design of vaccine antigens described here may provide a general means for eliciting antibodies of a desired class. PMID:26689967

  2. Reactor core of nuclear reactor

    International Nuclear Information System (INIS)

    In a BWR type nuclear reactor, the number of first fuel assemblies (uranium) loaded in a reactor core is smaller than that of second fuel assemblies (mixed oxide), the average burnup degree upon take-out of the first fuel assemblies is reduced to less than that of the second fuel assemblies, and the number of the kinds of the fuel rods constituting the first fuel assemblies is made smaller than that of the fuel rods constituting the second fuel assemblies. As a result, the variety of the plutonium enrichment degree is reduced to make the distribution of the axial enrichment degree uniform, thereby enabling to simplify the distribution of the enrichment degree. Then the number of molding fabrication steps for MOX fuel assemblies can be reduced, thereby enabling to reduce the cost for molding and fabrication. (N.H.)

  3. [Study on performance of Ni3 V2O8 catalyst and analysis of X-ray photoelectron spectroscopy].

    Science.gov (United States)

    Xu, Ai-ju; Zhaorigetu, Bao; Jia, Mei-lin; Lin, Qin

    2007-10-01

    Ni3V2O8 catalyst was prepared by oxalate co-precipitation method with microwave heating in this paper. In order to study the relationship between the catalytic performance and the surface species, the catalyst was characterized by XRD, BET, H2-TPR, XPS, TEM and conductivity measurement. The surface property of Ni3V2O8 was studied by XPS and the catalytic performance of the oxidative dehydrogenation of propane to propylene was also investigated. The results of XRD showedthat pure Ni3V2O8 with nice structure was obtained. TEM experiments results demonstrated that the prepared Ni3V2O8 catalyst at 700 degrees C calcination showed uniform particle with the mean particle size of 30 nm. The surface area of the catalyst was 8.623 m2 x g(-1). The diagram of the relationship between electrical conductivity and oxygen partial pressure of Ni3V2O8 showed dsigma/dPO2, >0, implying that Ni3V2O8 catalyst was a p-type semiconductor. H2-TPR results showed that only one unsymmetrical reduction peak appeared at 663.5 degreesC within 300-900 degrees C region over Ni3V2O8 catalyst and no obvious shoulder peak was observed. It could also be found that the ratio of non complete reduction oxygen species was about 33.59% (O(-) 27.55%, O2(2-) 6.04%) from the O(1s) XPS result and more V4+ species existed on the Ni3V2O8 catalyst surface. The TPR and XPS results illustrated that the transformation of the lattice oxygen to non-complete reduction oxygen in NiV2O8 catalyst might promote the oxidation-reduction reaction between different valence vanadium and promoted the oxygen vacancy formation. This then led to abundant non-complete reduction oxygen O(-) and V4+ species formation on the surface of Ni3V2O8 catalyst. The active result of oxidative dehydrogenation of propane to propylene showed that the 60.02% propylene selectivity could be reached at 18.60% propane conversion. Compared with the reported results over the coexistent NiO and Ni3V2O8 system from the literature, pure Ni3V2O8 catalyst

  4. Structural phase transitions in HfV2Hsub(x) and Zrsub(0.99)Hf0.01V2Hsub(x) observed in time differential perturbed angular correlation studies

    International Nuclear Information System (INIS)

    The temperature dependence of electric field gradients was measured in the intermetallic compounds HfV2 and Zrsub(0.99)Hfsub(0.01)V2, their hydrides HfV2Hsub(x) (x=0.4, 1., 4.) and Zrsub(0.99)Hfsub(0.01)V2Hsub(x) (x=0.4, 1.3), and the deuterides HfV2Dsub(0.4) and Zrsub(0.99)Hfsub(0.01)V2Dsub(0.4). The measurement is based on the hyperfine interaction at the probe nucleus 181Ta. These parameters allowed to follow the configurational changes with respect to the hafnium sites in a sensitive and quantitative manner. In Zrsub(0.99)Hfsub(0.01)V2 the distortion of the cubic Laves phase was observed for the temperature range below 110(3) K. This finding is in accordance with neutron diffraction data. Furthermore a strong deviation from axial symmetry was measured. Thus a reduction of symmetry is indicated which exceeds the purely rhomboedric distortion so far resolved. For HfV2 it is also inferred that symmetry is reduced to be not higher than orthorhombic. At room temperature the same perturbation of cubic symmetry was induced locally by neutron irradiation and demonstrated to be of high thermal stability. These results support the idea that the phase transition is due to a band Jahn-Teller effect. The values of the electric field gradients vary with a temperature dependence characteristic for order parameters. The related critical exponent classes the phase transition akin to 3-dimensional Ising models. In Zrsub(0.99)Hfsub(0.01)V2Hsub(0.4)/Dsub(0.4) hydrogen free domains were observed at low temperatures. Such fractions were not resolved for the other hydrides. The latter exhibit a transition from a low symmetric to a cubic structure at distinctly higher temperatures (above ca. 230 K). (orig./GSCH)

  5. Types of Nuclear Reactors

    International Nuclear Information System (INIS)

    The presentation is based on the following areas: Types of Nuclear Reactors, coolant, moderator, neutron spectrum, fuel type, pressurized water reactor (PWR), boiling water reactor (BWR) reactor pressurized heavy water (PHWR), gas-cooled reactor, RBMK , Nuclear Electricity Generation,Challenges in Nuclear Technology Deployment,EPR, APR1400, A P 1000, A PWR, ATMEA 1, VVER-1000, A PWR, VVER 1200, Boiling Water Reactor, A BWR, A BWR -II, ESBUR, Ke ren, AREVA, Heavy Water Reactor, Candu 6, Acr-1000, HWR, Bw, Iris, CAREM NuCcale, Smart, KLT-HOS, Westinghouse small modular Reactor, Gas Cooled Reactors, PBMR.

  6. Simulation of rod ejection accident in a WWER-1000 Nuclear Reactor by using PARCS code

    International Nuclear Information System (INIS)

    Highlights: • REA in WWER-1000 Nuclear Reactor was simulated. • PARCS v2.7 and WIMSD-5B codes were used. • PARCS was validated for steady-state and transient processes. • Temperature reactivity coefficient was calculated. • TH block of PARCS v2.7 code was used. - Abstract: The rod ejection accident is defined as the postulated rupture of a control rod drive mechanism housing that results in the complete ejection of a rod cluster control assembly from the reactor core. The consequences of the mechanical failure are a rapid positive reactivity insertion and an increase in the local power peaking with high local energy deposition in the fuel assembly, accompanied by an initial pressure increase in the reactor cooling system. In this study, the REA has been simulated in a WWER-1000 reactor by using WIMSD-5B and PARCS v2.7 codes. First, macroscopic cross-sections have been calculated for various types of fuel assemblies using WIMSD-5B. Results have been fed as input to PARCS v2.7 code. Steady-state, transient and specially thermal–hydraulic feedback blocks of PARCS code have been handled in this simulation. Finally, results have been compared with Final Safety Analysis Report of WWER-1000 reactor. The results show a great similarity and confirm the ability of PARCS code in simulation of transient accidents

  7. Nuclear reactor

    International Nuclear Information System (INIS)

    A nuclear reactor is described in which the core components, including fuel-rod assemblies, control-rod assemblies, fertile rod-assemblies, and removable shielding assemblies, are supported by a plurality of separate inlet modular units. These units are referred to as inlet module units to distinguish them from the modules of the upper internals of the reactor. The modular units are supported, each removable independently of the others, in liners in the supporting structure for the lower internals of the reactor. The core assemblies are removably supported in integral receptacles or sockets of the modular units. The liners, units, sockets and assemblies have inlet openings for entry of the fluid. The modular units are each removably mounted in the liners with fluid seals interposed between the opening in the liner and inlet module into which the fluid enters in the upper and lower portion of the liner. Each assembly is similarly mounted in a corresponding receptacle with fluid seals interposed between the openings where the fluid enters in the lower portion of the receptacle or fitting closely in these regions. As fluid flows along each core assembly a pressure drop is produced along the fluid so that the fluid which emerges from each core assembly is at a lower pressure than the fluid which enters the core assembly. However because of the seals interposed in the mountings of the units and assemblies the pressures above and below the units and assemblies are balanced and the units are held in the liners and the assemblies are held in the receptacles by their weights as they have a higher specific gravity than the fluid. The low-pressure spaces between each module and its liner and between each core assembly and its module is vented to the low-pressure regions of the vessel to assure that fluid which leaks through the seals does not accumulate and destroy the hydraulic balance

  8. MinFinder v2.0: An improved version of MinFinder

    Science.gov (United States)

    Tsoulos, Ioannis G.; Lagaris, Isaac E.

    2008-10-01

    A new version of the "MinFinder" program is presented that offers an augmented linking procedure for Fortran-77 subprograms, two additional stopping rules and a new start-point rejection mechanism that saves a significant portion of gradient and function evaluations. The method is applied on a set of standard test functions and the results are reported. New version program summaryProgram title: MinFinder v2.0 Catalogue identifier: ADWU_v2_0 Program summary URL:http://cpc.cs.qub.ac.uk/summaries/ADWU_v2_0.html Program obtainable from: CPC Program Library, Queen's University, Belfast, N. Ireland Licensing provisions: Standard CPC Licence, http://cpc.cs.qub.ac.uk/licence/licence.html No. of lines in distributed program, including test data, etc.: 14 150 No. of bytes in distributed program, including test data, etc.: 218 144 Distribution format: tar.gz Programming language used: GNU C++, GNU FORTRAN, GNU C Computer: The program is designed to be portable in all systems running the GNU C++ compiler Operating system: Linux, Solaris, FreeBSD RAM: 200 000 bytes Classification: 4.9 Catalogue identifier of previous version: ADWU_v1_0 Journal reference of previous version: Computer Physics Communications 174 (2006) 166-179 Does the new version supersede the previous version?: Yes Nature of problem: A multitude of problems in science and engineering are often reduced to minimizing a function of many variables. There are instances that a local optimum does not correspond to the desired physical solution and hence the search for a better solution is required. Local optimization techniques can be trapped in any local minimum. Global optimization is then the appropriate tool. For example, solving a non-linear system of equations via optimization, one may encounter many local minima that do not correspond to solutions, i.e. they are far from zero. Solution method: Using a uniform pdf, points are sampled from a rectangular domain. A clustering technique, based on a typical distance

  9. Nuclear research reactors

    International Nuclear Information System (INIS)

    It's presented data about nuclear research reactors in the world, retrieved from the Sien (Nuclear and Energetic Information System) data bank. The information are organized in table forms as follows: research reactors by countries; research reactors by type; research reactors by fuel and research reactors by purpose. (E.G.)

  10. Nuclear reactor physics course for reactor operators

    International Nuclear Information System (INIS)

    The education and training of nuclear reactor operators is important to guarantee the safe operation of present and future nuclear reactors. Therefore, a course on basic 'Nuclear reactor physics' in the initial and continuous training of reactor operators has proven to be indispensable. In most countries, such training also results from the direct request from the safety authorities to assure the high level of competence of the staff in nuclear reactors. The aim of the basic course on 'Nuclear Reactor Physics for reactor operators' is to provide the reactor operators with a basic understanding of the main concepts relevant to nuclear reactors. Seen the education level of the participants, mathematical derivations are simplified and reduced to a minimum, but not completely eliminated

  11. Competition between plant functional types in the Canadian Terrestrial Ecosystem Model (CTEM v. 2.0

    Directory of Open Access Journals (Sweden)

    J. R. Melton

    2015-06-01

    Full Text Available The Canadian Terrestrial Ecosystem Model (CTEM is the interactive vegetation component in the Earth system model of the Canadian Centre for Climate Modelling and Analysis. CTEM models land–atmosphere exchange of CO2 through the response of carbon in living vegetation, and dead litter and soil pools, to changes in weather and climate at timescales of days to centuries. Version 1.0 of CTEM uses prescribed fractional coverage of plant functional types (PFTs although, in reality, vegetation cover continually adapts to changes in climate, atmospheric composition, and anthropogenic forcing. Changes in the spatial distribution of vegetation occur on timescales of years to centuries as vegetation distributions inherently have inertia. Here, we present version 2.0 of CTEM which includes a representation of competition between PFTs based on a modified version of the Lotka–Volterra (L–V predator–prey equations. Our approach is used to dynamically simulate the fractional coverage of CTEM's seven natural, non-crop PFTs which are then compared with available observation-based estimates. Results from CTEM v. 2.0 show the model is able to represent the broad spatial distributions of its seven PFTs at the global scale. However, differences remain between modelled and observation-based fractional coverages of PFTs since representing the multitude of plant species globally, with just seven non-crop PFTs, only captures the large scale climatic controls on PFT distributions. As expected, PFTs that exist in climate niches are difficult to represent either due to the coarse spatial resolution of the model, and the corresponding driving climate, or the limited number of PFTs used. We also simulate the fractional coverages of PFTs using unmodified L–V equations to illustrate its limitations. The geographic and zonal distributions of primary terrestrial carbon pools and fluxes from the versions of CTEM that use prescribed and dynamically simulated fractional

  12. Rain Impact Model V2.0 for Sea Surface Salinity: A Flag for Salinity Stratification

    Science.gov (United States)

    Santos-Garcia, A.

    2015-12-01

    The Central Florida Remote Sensing Laboratory has analyzed Aquarius (AQ) sea surface salinity (SSS) and ESA's Soil Moisture Ocean Salinity (SMOS) retrievals in the presence of rain and has developed a Rain Impact Model (RIM V2.0) that predicts transient near-surface salinity stratification based upon the corresponding rain accumulation over the previous 24 hours and the effect of the wind speed. For both of the satellite SSS measurements, a common reference for comparison is the Hybrid Coordinate Ocean Model (HYCOM) for ocean salinity, but there is a significant mismatch between the remote sensing sampling depth of approximately 0.01 m and the typical range of 5 m to 10 m of in situ instruments. Under normal ocean conditions the upper layer of the ocean is well mixed and there is an approximately uniform salinity for the first 10 m depth; therefore satellite measurements are good estimates of the bulk salinity. Conversely, under rainy conditions, there is a dilution of the near-surface salinity that mixed downward by diffusion and mechanical mixing of gravity waves, where the wind speed information play a significant role in the model. This transient phenomena, known as salinity stratification, significantly modifies the salinity gradient in the upper 1 m of the ocean; and therefore invalidates the usual assumption of well-mixed salinity. Generally, these salinity stratifications dissipate in less than a couple of hours and the upper layer becomes well mixed at a slightly fresher salinity. The Rain Impact Model V2.0 is based on the RIM V1.0, previously published, which includes the rain accumulation effect but ignores the variations on wind speed using a constant vertical diffusivity value. This research addresses the effects of rainfall on the AQ and SMOS SSS retrieval using a macro-scale Rain Impact Model (RIM) in regions of high convective rain. This model, based on the superposition of a one-dimension eddy diffusion (turbulent diffusion) model, relates sea

  13. Competition between plant functional types in the Canadian Terrestrial Ecosystem Model (CTEM) v. 2.0

    Science.gov (United States)

    Melton, J. R.; Arora, V. K.

    2016-01-01

    The Canadian Terrestrial Ecosystem Model (CTEM) is the interactive vegetation component in the Earth system model of the Canadian Centre for Climate Modelling and Analysis. CTEM models land-atmosphere exchange of CO2 through the response of carbon in living vegetation, and dead litter and soil pools, to changes in weather and climate at timescales of days to centuries. Version 1.0 of CTEM uses prescribed fractional coverage of plant functional types (PFTs) although, in reality, vegetation cover continually adapts to changes in climate, atmospheric composition and anthropogenic forcing. Changes in the spatial distribution of vegetation occur on timescales of years to centuries as vegetation distributions inherently have inertia. Here, we present version 2.0 of CTEM, which includes a representation of competition between PFTs based on a modified version of the Lotka-Volterra (L-V) predator-prey equations. Our approach is used to dynamically simulate the fractional coverage of CTEM's seven natural, non-crop PFTs, which are then compared with available observation-based estimates. Results from CTEM v. 2.0 show the model is able to represent the broad spatial distributions of its seven PFTs at the global scale. However, differences remain between modelled and observation-based fractional coverage of PFTs since representing the multitude of plant species globally, with just seven non-crop PFTs, only captures the large-scale climatic controls on PFT distributions. As expected, PFTs that exist in climate niches are difficult to represent either due to the coarse spatial resolution of the model, and the corresponding driving climate, or the limited number of PFTs used. We also simulate the fractional coverage of PFTs using unmodified L-V equations to illustrate its limitations. The geographic and zonal distributions of primary terrestrial carbon pools and fluxes from the versions of CTEM that use prescribed and dynamically simulated fractional coverage of PFTs compare

  14. V2 to Bomarc: Reading Gravity’s Rainbow in Context

    Directory of Open Access Journals (Sweden)

    Joshua Comyn

    2014-07-01

    Full Text Available In this article I argue that while Thomas Pynchon’s 1973 novel, Gravity’s Rainbow, is set primarily between 1944-1946 in Europe, it also simultaneously addresses itself to its own authorial context—that of the “Long Sixties” in America. In particular I consider details of Pynchon’s employment at the Bomarc Service News in the years 1960-1962—the Bomarc being a surface-to-air interceptor missile manufactured by the Boeing Aircraft Company for the United States Air Force. Given that the V-2 rocket is the preeminent symbol of control in Gravity’s Rainbow, I argue that we ought to consider Gravity’s Rainbow in relation to the Bomarc, a technological descendent of the V-2, and a key defensive weapon in the Air Force’s Semi-Automatic Ground Environment (SAGE, a centralised system for continental air defence, and the preeminent computerised command and control system of its time. The Bomarc was for these reasons a crucial component of a technical system of control that provided the primary material support for what Paul Edwards has described as the “closed-world discourse” of Cold War America. In light of this history I proceed to read the novel in terms of the operative presence of this discourse in the American public domain—in articles, newsreels and other media—demonstrating the manner in which the ‘Rocket-State’ of Gravity’s Rainbow reconstitutes the human subject as a cyborg, thereby problematising the liberal humanist conception of the subject as discrete, autonomous and autopoetic. I supplement this contextual reading of the novel with formalist considerations for the manner in which the reader of the novel is implicated in Gravity’s Rainbow’s own operations of closure and control, and argue that the reader of the novel is also, regardless of context, subjected to and by the act of reading the novel considered in cybernetic terms. I conclude the essay by reading the novel’s closing moments against the

  15. Nuclear reactor

    International Nuclear Information System (INIS)

    Cover gas spaces for primary coolant vessel, such as a reactor container, a pump vessel and an intermediate heat exchanger vessel are in communication with each other by an inverted U-shaped pressure conduit. A transmitter and a receiver are disposed to the pressure conduit at appropriate positions. If vibration frequencies (pressure vibration) from low frequency to high frequency are generated continuously from the transmitter to the inside of the communication pipe, a resonance phenomenon (air-column resonance oscillation) is caused by the inherent frequency or the like of the communication pipe. The frequency of the air-column resonance oscillation is changed by the inner diameter and the clogged state of the pipelines. Accordingly, by detecting the change of the air-column oscillation characteristics by the receiver, the clogged state of the flow channels in the pipelines can be detected even during the reactor operation. With such procedures, steams of coolants flowing entrained by the cover gases can be prevented from condensation and coagulation at a low temperature portion of the pipelines, otherwise it would lead clogging in the pipelines. (I.N.)

  16. Study on aluminothermic reduction of V2O5: effect of slag chemistry

    International Nuclear Information System (INIS)

    Vanadium alloys are promising candidate materials for structural components of fusion reactors because of their superior high temperature thermal and physical properties, low cross section to neutrons, low activation properties and good resistance against neutron irradiation. Increased level of interstitial impurities like O and N in vanadium is known to have several detrimental effects on the workability and weldability of alloys. Activation consideration also place limitation on N content. In the present study, systematic work is done with the use of modern analytical techniques to better understand the science of the thermit process of vanadium so that it can be applied efficiently at bigger scale. In literature, generally CaO is used as a fluxing agent, to minimize excess heat and also for good slag metal separation in aluminothermy. Normally heat sinks are added in order to control the heat of reaction. This study shows that apart from the quantity, it is the nature of heat sink/flux, which plays an important role in controlling the heat of reaction, which subsequently result in better yield and quality of the product. Effect of various parameters like amount of heat sink/flux, nature of heat sink, excess aluminum and particle size of Al has been studied. Heat sink materials/ fluxes were added to control the vigorous nature of the reaction and a corresponding increase in slag volume (resulting in thicker slag layer) was also intended. Increased slag volume was expected to decrease the interaction of air with the molten metal thereby resulting in minimization of nitrogen in the final metal. This aspect is examined in detail in the present work. It will help in better understanding of the process as far as the contribution of nitrogen in thermit from air and starting material. In general, during the aluminothermic reduction, MgO walled reactors is used, but in this study it is shown that substantial amount of MgO also participate in the aluminothermy. The role

  17. Influences of Bi2O3/V2O5 Additives on the Microstructure and Magnetic Properties of Lithium Ferrite

    Institute of Scientific and Technical Information of China (English)

    SU Hua; ZHANG Huai-Wu; TANG Xiao-Li; JING Yu-Lan; ZHONG Zhi-Yong

    2009-01-01

    Lithium ferrite materials with different concentrations of Bi2O3 and V2O5 additives are prepared by the conventionai ceramic technique. The x-ray diffraction analysis proves that the additives do not affect the final crystal phase of the lithium ferrite in our testing range. Both Bi203 and V2O5 additives could promote densification and lower sintering temperature of the lithium ferrite. The average grain size first increases, and then graduaily decreases with the Bi2O3 content. The maximal grain size appears with 0.25 wt% Bi2O3. The average grain size first increases, and then is kept almost unchanged with the V2O5 content. The maximal average grain size of the samples with V2O5 additive is much smailer than that of the samples with Bi2O3 additive, Furthermore,the V2O5 additive more easily enters the crystal lattice of the lithium ferrite than the Bi2O3 additive. These characteristics evidently affect the magnetic properties, such as saturation flux density, ratio of remanence Br to saturation flux density Bs, and coercive force of the lithium ferrite. The mechanisms involved are discussed.

  18. Promotional effects of carbon nanotubes on V2O5/TiO2 for NOX removal

    International Nuclear Information System (INIS)

    Highlights: → A series of V2O5/TiO2-CNT catalysts were synthesized by sol-gel. → A catalytic promotion was observed by adding CNTs to V2O5/TiO2. → The acidity and oxidation of NO to NO2 increased with CNTs. - Abstract: A series of V2O5/TiO2-carbon nanotube (CNT) catalysts were synthesized by sol-gel method, and their activities for NOX removal were compared. A catalytic promotional effect was observed by adding CNTs to V2O5/TiO2. The catalyst V2O5/TiO2-CNTs (10 wt.%) showed an NOX removal efficiency of 89% at 300 oC under a GHSV of 22,500 h-1. Based on X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, NH3-temperature-programmed desorption, temperature-programmed reduction, Brunauer-Emmett-Teller surface area measurements, differential scanning calorimetry, and thermogravimetric analysis, the increased acidity and reducibility, which could promote NH3 adsorption and oxidation of NO to NO2, respectively, contributed to this promotion.

  19. Stability Criteria of Fullerene-like Nanoparticles: Comparing V2O5 to Layered Metal Dichalcogenides and Dihalides

    Directory of Open Access Journals (Sweden)

    Yehiam Prior

    2010-08-01

    Full Text Available Numerous examples of closed-cage nanostructures, such as nested fullerene-like nanoparticles and nanotubes, formed by the folding of materials with layered structure are known. These compounds include WS2, NiCl2, CdCl2, Cs2O, and recently V2O5. Layered materials, whose chemical bonds are highly ionic in character, possess relatively stiff layers, which cannot be evenly folded. Thus, stress-relief generally results in faceted nanostructures seamed by edge-defects. V2O5, is a metal oxide compound with a layered structure. The study of the seams in nearly perfect inorganic "fullerene-like" hollow V2O5 nanoparticles (NIF-V2O5 synthesized by pulsed laser ablation (PLA, is discussed in the present work. The relation between the formation mechanism and the seams between facets is examined. The formation mechanism of the NIF-V2O5 is discussed in comparison to fullerene-like structures of other layered materials, like IF structures of MoS2, CdCl2, and Cs2O. The criteria for the perfect seaming of such hollow closed structures are highlighted.

  20. Structural, compositional and magnetic characterization of bulk V2O5 doped ZnO system

    International Nuclear Information System (INIS)

    This paper investigates the structural, compositional and magnetic properties of vanadium doped ZnO bulk samples prepared by solid state reaction technique. The Rietveld refinement analysis for XRD results of samples showed small change in lattice parameters for 3 and 5% vanadium doped ZnO samples indicating the substitution of Zn2+ ions by vanadium ions in ZnO lattice. Raman spectroscopy reveals the change in ZnO modes positions due to vanadium doping. The appearance of E1 and E2 modes showed that the wurtzite structure of ZnO is still maintained after doping of vanadium oxide. XPS analysis confirms the presence of the different elements and oxidation states of vanadium ions. M-H curves obtained from VSM showed weak ferromagnetism in the samples. The observation of ferromagnetic behavior indicates the formation of ZnVO phase with V2+ ion substitution in the ZnO lattice. XPS scans of the etched bulk samples confirmed the 2+ oxidation state of vanadium ions in our samples explaining the origin of ferromagnetism.

  1. Repurposing the Microsoft Kinect for Windows v2 for external head motion tracking for brain PET

    International Nuclear Information System (INIS)

    Medical imaging systems such as those used in positron emission tomography (PET) are capable of spatial resolutions that enable the imaging of small, functionally important brain structures. However, the quality of data from PET brain studies is often limited by subject motion during acquisition. This is particularly challenging for patients with neurological disorders or with dynamic research studies that can last 90 min or more. Restraining head movement during the scan does not eliminate motion entirely and can be unpleasant for the subject. Head motion can be detected and measured using a variety of techniques that either use the PET data itself or an external tracking system. Advances in computer vision arising from the video gaming industry could offer significant benefits when re-purposed for medical applications. A method for measuring rigid body type head motion using the Microsoft Kinect v2 is described with results presenting  ⩽0.5 mm spatial accuracy. Motion data is measured in real-time at 30 Hz using the KinectFusion algorithm. Non-rigid motion is detected using the residual alignment energy data of the KinectFusion algorithm allowing for unreliable motion to be discarded. Motion data is aligned to PET listmode data using injected pulse sequences into the PET/CT gantry allowing for correction of rigid body motion. Pilot data from a clinical dynamic PET/CT examination is shown. (paper)

  2. Experimental intra-arterial administration of SR-2508 in the rabbit V2 carcinoma model

    International Nuclear Information System (INIS)

    The use of the nitroimidazole radiation sensitizers, misonidazole and SR-2508, has been limited by a variety of side-effects, principally peripheral neuropathies. To increase the effectiveness of radiosensitization and reduce the administered dose of the sensitizers, intra-arterial delivery of SR-2508 was performed and followed with 10Gy of 4 MeV photon beam radiotherapy in the rabbit V2 carcinoma tumour model. Comparison was made with rabbits treated with an identical dose of SR-2508 given intravenously prior to photon beam radiotherapy. Control animals were treated with radiation therapy only, intra-arterial SR-2508 only, or had no treatment. Neither radiation therapy alone nor SR-2508 alone had any effect on tumour growth. In the intra-arterial group, tumour growth was slower and size was significantly smaller than all other groups. Results suggest that the intra-arterial infusion of radiation sensitizer produces greater tumour response than intravenous infusion when each is combined with radiation therapy. (author)

  3. Experimental intra-arterial administration of SR-2508 in the rabbit V2 carcinoma model

    Energy Technology Data Exchange (ETDEWEB)

    Coldwell, D.M.; Huff, J.; Marcellus, H.; Coldwell, S.G.

    1989-03-01

    The use of the nitroimidazole radiation sensitizers, misonidazole and SR-2508, has been limited by a variety of side-effects, principally peripheral neuropathies. To increase the effectiveness of radiosensitization and reduce the administered dose of the sensitizers, intra-arterial delivery of SR-2508 was performed and followed with 10Gy of 4 MeV photon beam radiotherapy in the rabbit V2 carcinoma tumour model. Comparison was made with rabbits treated with an identical dose of SR-2508 given intravenously prior to photon beam radiotherapy. Control animals were treated with radiation therapy only, intra-arterial SR-2508 only, or had no treatment. Neither radiation therapy alone nor SR-2508 alone had any effect on tumour growth. In the intra-arterial group, tumour growth was slower and size was significantly smaller than all other groups. Results suggest that the intra-arterial infusion of radiation sensitizer produces greater tumour response than intravenous infusion when each is combined with radiation therapy.

  4. Properties of VO2 Films Sputter-Deposited from V2O5 Target

    Science.gov (United States)

    Tsai, Kuang-Yue; Chin, Tsung-Shune; Shieh, Han-Ping D.

    2003-07-01

    Rutile VO2 is a thermochromic material that exhibits a reversible metal-insulator phase transition upon thermal cycling. A new deposition process of rutile VO2 from a V2O5 target was developed using reactive oxygen instead of hydrogen. Adjusting the substrate temperature and the oxygen flow ratio changes the compositions and phases of the as-deposited films into rutile VO2 under optimum deposition conditions on the Si and thick glass substrates. Crystalline phases analyzed by X-ray diffraction shows the relationship among V4O9, V6O13, and VO2 films prepared under different deposition conditions. Analysis by AFM shows that VO2 films grown at higher substrate temperatures have larger grain size. The optical switching property of VO2 was measured at a wavelength of 1.5 μm and transition temperature around 45°C was also measured. Inhomogeneity and the strained structure of the film are suggested to be the reasons of transition temperature lower than typical reported value because the impurity in the target is too low to be detected quantatively by ICP.

  5. Repurposing the Microsoft Kinect for Windows v2 for external head motion tracking for brain PET

    Science.gov (United States)

    Noonan, P. J.; Howard, J.; Hallett, W. A.; Gunn, R. N.

    2015-11-01

    Medical imaging systems such as those used in positron emission tomography (PET) are capable of spatial resolutions that enable the imaging of small, functionally important brain structures. However, the quality of data from PET brain studies is often limited by subject motion during acquisition. This is particularly challenging for patients with neurological disorders or with dynamic research studies that can last 90 min or more. Restraining head movement during the scan does not eliminate motion entirely and can be unpleasant for the subject. Head motion can be detected and measured using a variety of techniques that either use the PET data itself or an external tracking system. Advances in computer vision arising from the video gaming industry could offer significant benefits when re-purposed for medical applications. A method for measuring rigid body type head motion using the Microsoft Kinect v2 is described with results presenting  ⩽0.5 mm spatial accuracy. Motion data is measured in real-time at 30 Hz using the KinectFusion algorithm. Non-rigid motion is detected using the residual alignment energy data of the KinectFusion algorithm allowing for unreliable motion to be discarded. Motion data is aligned to PET listmode data using injected pulse sequences into the PET/CT gantry allowing for correction of rigid body motion. Pilot data from a clinical dynamic PET/CT examination is shown.

  6. Electroweak ZZjj production in the Standard Model and beyond in the POWHEG-BOX V2

    International Nuclear Information System (INIS)

    We present an implementation of electroweak ZZjj production in the POWHEG BOX V2 framework, an upgrade of the POWHEG BOX program which includes a number of new features that are particularly helpful for high-multiplicity processes. We consider leptonic and semi-leptonic decay modes of the Z bosons, and take non-resonant contributions and spin correlations of the final-state particles into account. In the case of decays to leptons, we also include interactions beyond the Standard Model that arise from an effective Lagrangian which includes CP conserving and violating operators up to dimension six. We find that while leptonic distributions are very sensitive to anomalous couplings, because of the small cross-section involved, these analyses are feasible only after a high-luminosity upgrade of the LHC. We consider the cases of a 14 TeV, 33 TeV and 100 TeV machine and discuss the limits that can be placed on those couplings for different luminosities

  7. Heat switch effect in an antiferromagnetic insulator Co3V2O8

    Science.gov (United States)

    Zhao, X.; Wu, J. C.; Zhao, Z. Y.; He, Z. Z.; Song, J. D.; Zhao, J. Y.; Liu, X. G.; Sun, X. F.; Li, X. G.

    2016-06-01

    We report a heat switch effect in single crystals of an antiferromagnet Co3V2O8, that is, the thermal conductivity (κ) can be changed with magnetic field in an extremely large scale. Due to successive magnetic phase transitions at 12-6 K, the zero-field κ(T ) displays a deep minimum at 6.7 K and rather small magnitude at low temperatures. Both the temperature and field dependencies of κ demonstrate that the phonons are strongly scattered at the regime of magnetic phase transitions. Magnetic field can suppress magnetic scattering effect and significantly recover the phonon thermal conductivity. In particular, a 14 T field along the a axis increases the κ at 7.5 K up to 100 times. For H ∥c , the magnitude of κ can be suppressed down to ˜8% at some field-induced transition and can be enhanced up to 20 times at 14 T. The present results demonstrate that it is possible to design a kind of heat switch in the family of magnetic materials.

  8. World Digital Magnetic Anomaly Map version 2 (WDMAM v.2) - released for research and education

    Science.gov (United States)

    CHOI-Dyment, Y.; Lesur, V.; Dyment, J.; Hamoudi, M.; Thebault, E.; Catalan, M.

    2015-12-01

    The World Digital Magnetic Anomaly Map is an international initiative carried out under the auspices of the International Association of Geomagnetism and Aeronomy (IAGA) and the Commission for the Geological Map of the World (CGMW). A first version of the map has been published and distributed eight years ago (WDMAM v1; Korhonen et al., 2007). We have produced a candidate which has been accepted as the second version of this map (WDMAM v2) at the International Union of Geophysics and Geodesy in Prag, in June 2015. On land, we adopted an alternative approach avoiding any unnecessary processing on existing aeromagnetic compilations. When available, we used the original aeromagnetic data. As a result the final compilation remains an acceptable representation of the national and international data grids. Over oceanic areas the marine data have been extended. In areas of insufficient data coverage, a model has been computed based on a modified digital grid of the oceanic lithosphere age, considering plate motions in the determination of magnetization vector directions. This model has been further adjusted to the available data, resulting in a better representation of the anomalies. The final grid will be periodically upgraded. Version 2.0 has been released and is available at wdmam.org to support both research and education projects. Colleagues willing to contribute data for future releases (and become a co-author of the map) should contact any of the authors or Jerome Dyment (chair of the WDMAM Task Force) at jdy@ipgp.fr .

  9. Oxygen Incorporation and Release in Metastable Bixbyite V2O3 Nanocrystals.

    Science.gov (United States)

    Bergerud, Amy; Selbach, Sverre M; Milliron, Delia J

    2016-06-28

    A new, metastable polymorph of V2O3 with a bixbyite structure was recently stabilized in colloidal nanocrystal form. Here, we report the reversible incorporation of oxygen in this material, which can be controlled by varying temperature and oxygen partial pressure. Based on X-ray diffraction (XRD) and thermogravimetric analysis, we find that oxygen occupies interstitial sites in the bixbyite lattice. Two oxygen atoms per unit cell can be incorporated rapidly and with minimal changes to the structure while the addition of three or more oxygen atoms destabilizes the structure, resulting in a phase change that can be reversed upon oxygen removal. Density functional theory (DFT) supports the reversible occupation of interstitial sites in bixbyite by oxygen, and the 1.1 eV barrier to oxygen diffusion predicted by DFT matches the activation energy of the oxidation process derived from observations by in situ XRD. The observed rapid oxidation kinetics are thus facilitated by short diffusion paths through the bixbyite nanocrystals. Due to the exceptionally low temperatures of oxidation and reduction, this earth-abundant material is proposed for use in oxygen storage applications. PMID:27228389

  10. Electrochemical impedance spectra of V2O5 xerogel films with intercalation of lithium ion

    Institute of Scientific and Technical Information of China (English)

    ZHANG Yong; LIU Yu-wen; CHENG Yu-shan; HU Xin-guo

    2005-01-01

    Vanadium pentoxide xerogel films used for lithium rechargeable batteries were prepared from crystalline c-V2 O5 by melt quenching method,then the electrochemical process of lithium intercalation into vanadium pentoxide xerogel films was simulated with an equivalent circuit model, which was derived from the mechanism of electrode reactions. Measured electrochemical impedance spectra at various electrode potentials were analyzed by using the complex non-linear least-squares fitting method. The results show that impedance spectra consist of 2 high-to-medium frequency depressed arcs and a low frequency straight line. The high frequency arc is attributed to the absorption reaction of lithium ions into the oxide film, the medium frequency arc is attributed to the charge transfer reaction at the vanadium oxide/electrolyte interface and the low frequency is characterized by a straight line with a phase angle of 45° corresponding to the diffusion of lithium ion through vanadium oxide phase. The experimental and calculated results are compared and discussed focusing on the electrochemical performance and the state of charge of the electrode. Moreover, the high consistence of the fitted values of the model to the experimental data indicates that this mathematical model does give a satisfying description of the intercalation process of vanadium pentoxide xerogel films.

  11. Assessment of the accuracy of 3D models obtained with DSLR camera and Kinect v2

    Science.gov (United States)

    Lachat, E.; Macher, H.; Landes, T.; Grussenmeyer, P.

    2015-05-01

    3D modeling of objects such as statues, moldings or ornaments, answers to a need of documentation and analysis in the field of cultural heritage. Several sensors based on different technologies are used to obtain information on the geometry of an object in form of point clouds: laser scanners, digital cameras or more recently RGB-D cameras. Among them, the recent Kinect v2 sensor looks promising and therefore its use has been studied in this paper. The aim of this paper is to compare two methodologies for 3D models acquisition: photogrammetry-based models and models obtained using a RGB-D camera. Since the quality of the meshed models is obviously correlated to the quality of the point cloud, the result will be more or less faithful to reality. To quantify this reliability, several comparisons to a reference model have been carried out. Regarding the results of the comparisons, we will be able to conclude about the strengths and weaknesses of photogrammetry and RGB-D cameras for 3D modeling of complex objects.

  12. The optical and electrochemical properties of electrochromic films: WO3+xV2O5

    Science.gov (United States)

    Li, Zhuying; Liu, Hui; Liu, Ye; Yang, Shaohong; Liu, Yan; Wang, Chong

    2010-05-01

    Since Deb's experiment in 1973 on the electrochromic effect, transmissive electrochromic films exhibit outstanding potential as energy efficient window controls which allow dynamic control of the solar energy transmission. These films with non-volatile memory, once in the coloured state, remain in the same state even after removal of the field. The optical and electrochemical properties of electrochromic films using magnetron sputter deposition tungsten oxide thin films and vanadium oxide doped tungsten-vanadium oxide thin films on ITO coated glass were investigated. From the UV region of the transmittance spectra, the optical band gap energy from the fundamental absorption edge can be determined. And the Cyclic voltammograms of these thin films in 1 mol LiClO4 propylene carbonate electrolyte (LIPC) were measured and analysed. The anode electrochromic V2O5 doped cathode electrochromic WO3 could make films colour changing while the transmittance of films keeped invariance. These performance characteristics make tungstenvanadium oxide colour changeably thin films are suitable for electrochromic windows applications.

  13. The gene for Nijmegen breakage syndrome (V2) is not located on chromosome 11

    Energy Technology Data Exchange (ETDEWEB)

    Kenshi Komatsu; Shinya Matsuura; Hiroshi Tauchi; Satoru Endo [Hiroshima Univ. (Japan)] [and others

    1996-04-01

    Ataxia telanglectasia (AT) is an autosomal recessive disorder characterized by oculocutaneous telangiectasia and cerebellar ataxia. Individuals with this disorder display immunological impairments, hypersensitivity to ionizing radiation, and a predisposition to cancer. There has been reported genetic heterogeneity in AT, which appeared to include four genetic complementation groups in classical AT - i.e., A, B/C, D, E - and two variants, so-called Nijmegen breakage syndrome (NBS), V1 and V2. Among the four groups of classical AT, no significant differences in clinical appearance have been seen. Familial linkage analyses have produced evidence that genes for all four complementation groups in classical AT reside in a narrow region on chromosome 11q22-23. On the other hand, NBS patients have neither cerebellar ataxia nor telanglectasia but do display microcephaly and a developmental delay. However, patients share features with AT, such as high radiosensitivity, radioresistant DNA synthesis (RDS), and chromosome instability, suggesting that the same pathway (or part thereof) is impaired in both syndromes. The underlying gene for NBS has not yet been identified, and its location in the human genome is still unknown. 15 refs., 3 figs.

  14. WATERLOPP V2/64: A highly parallel machine for numerical computation

    Science.gov (United States)

    Ostlund, Neil S.

    1985-07-01

    Current technological trends suggest that the high performance scientific machines of the future are very likely to consist of a large number (greater than 1024) of processors connected and communicating with each other in some as yet undetermined manner. Such an assembly of processors should behave as a single machine in obtaining numerical solutions to scientific problems. However, the appropriate way of organizing both the hardware and software of such an assembly of processors is an unsolved and active area of research. It is particularly important to minimize the organizational overhead of interprocessor comunication, global synchronization, and contention for shared resources if the performance of a large number ( n) of processors is to be anything like the desirable n times the performance of a single processor. In many situations, adding a processor actually decreases the performance of the overall system since the extra organizational overhead is larger than the extra processing power added. The systolic loop architecture is a new multiple processor architecture which attemps at a solution to the problem of how to organize a large number of asynchronous processors into an effective computational system while minimizing the organizational overhead. This paper gives a brief overview of the basic systolic loop architecture, systolic loop algorithms for numerical computation, and a 64-processor implementation of the architecture, WATERLOOP V2/64, that is being used as a testbed for exploring the hardware, software, and algorithmic aspects of the architecture.

  15. Hybrid adsorptive membrane reactor

    Science.gov (United States)

    Tsotsis, Theodore T. (Inventor); Sahimi, Muhammad (Inventor); Fayyaz-Najafi, Babak (Inventor); Harale, Aadesh (Inventor); Park, Byoung-Gi (Inventor); Liu, Paul K. T. (Inventor)

    2011-01-01

    A hybrid adsorbent-membrane reactor in which the chemical reaction, membrane separation, and product adsorption are coupled. Also disclosed are a dual-reactor apparatus and a process using the reactor or the apparatus.

  16. Hybrid adsorptive membrane reactor

    Science.gov (United States)

    Tsotsis, Theodore T.; Sahimi, Muhammad; Fayyaz-Najafi, Babak; Harale, Aadesh; Park, Byoung-Gi; Liu, Paul K. T.

    2011-03-01

    A hybrid adsorbent-membrane reactor in which the chemical reaction, membrane separation, and product adsorption are coupled. Also disclosed are a dual-reactor apparatus and a process using the reactor or the apparatus.

  17. V2O3电铝热法冶炼FeV50的工艺探讨%TECHNOLOGY OF THERMITE METHOD SMELTING FeV50 WITH V2O3

    Institute of Scientific and Technical Information of China (English)

    李瑰生; 杜勇

    2005-01-01

    介绍了以V2O3为原料采用电铝热法冶炼FeV50的生产技术及工艺条件,并就如何提高FeV50产品质量和钒回收率进行了较深入的探讨,对V2O3电铝热法冶炼FeV50生产具有一定的指导意义.

  18. Thermal-deformation effect of welding on A 1 reactor pressure vessel weld joints properties and state of stress

    International Nuclear Information System (INIS)

    The methods are compared of electroslag welding and of arc welding with a view to their possible application in welding the Bohunice A-1 reactor pressure vessel. Considered are the thermal deformation effects of welding on the physical properties and the stress present in welded joints. For testing, plates were used having the dimensions of 1100x2300x200 mm and rings with 4820 mm outer diameter, 1800 mm height and 170 mm thickness made of steel CSN 413O30 modified with Ni, Al+Ti. The deformation effect of welding on the residual surface and triaxial stress, the specific stored energy, the initiation temperature of brittle crack and the critical size of the initiation defect corresponding to the thermal deformation effect of welding were determined. It was found that for electroslag welding, there is a low probability of crack formation in the joints, a low level of residual stress and a low level of specific stored energy in a relatively wide joint zone. For arc welding there is a considerable probability of defect formation in the vicinity of the sharp boundary of the joint, a high level of the triaxial state of stress in the tensile region, and a high level of specific stored energy concentrated in the narrow zone of weld joints. The recommended thermal process is given for welding pressure vessels made of the CSN 413030 steel modified with Ni, Al+Ti, and 150 to 200 mm in thickness. (J.P.)

  19. Studies on Nitrogen Oxides Removal Using Plasma Assisted Catalytic Reactor

    Institute of Scientific and Technical Information of China (English)

    V. Ravi; Young Sun Mok; B. S. Rajanikanth; Ho-Chul Kang

    2003-01-01

    An electric discharge plasma reactor combined with a catalytic reactor was studied for removing nitrogen oxides. To understand the combined process thoroughly, discharge plasma and catalytic process were separately studied first, and then the two processes were combined for the study. The plasma reactor was able to oxidize NO to NO2 well although the oxidation rate decreased with temperature. The plasma reactor alone did not reduce the NOx (NO+NO2)level effectively, but the increase in the ratio of NO2 to NO as a result of plasma discharge led to the enhancement of NOx removal efficiency even at lower temperatures over the catalyst surface (V2O5-WOa/TiO2). At a gas temperature of 100℃, the NOx removal efficiency obtained using the combined plasma catalytic process was 88% for an energy input of 36 eV/molecule or 30 J/1.

  20. Experience with fire protection during construction, start-up and operation of V-2 nuclear power plant

    International Nuclear Information System (INIS)

    The project of fire protection at the V-2 nuclear powre plant proceeded from the initial project for the V-1 nuclear power plant and proved inadequate. The problems are discussed which arose in this respect during the construction and start-up of the power plant. The problems were solved by the investor. The suppliers failed to fulfil their tasks in this respect. During the operation of the V-2 plant there has so far not been a fire requiring the shut-down of the plant. Recommendations are presented for increasing fire protection at the V-2 and for project designers and investors of newly built nuclear plants in the CSSR. (B.S.)

  1. Structural and electrochemical properties of single crystalline MoV 2O8 nanowires for energy storage devices

    KAUST Repository

    Shahid, Muhammad

    2013-05-01

    We report the synthesis of MoV2O8 nanowires of high quality using spin coating followed by the thermal annealing process. Transmission electron microscopy (TEM) reveals the average diameter of synthesized nanowire about 100 nm, and average length ranges from 1 to 5 μm. The TEM analysis further confirms the <001> growth direction of MoV 2O8 nanowires. The electrochemical properties of synthesized nanowires using cyclic voltammetry show the specific capacitance 56 Fg-1 at the scan rate of 5 mV s-1 that remains 24 Fg -1 at 100 mV s-1. The electrochemical measurements suggest that the MoV2O8 nanowires can be used as a material for the future electrochemical capacitors (energy storage devices). © 2012 Published by Elsevier Inc. All rights reserved.

  2. Reactor container

    International Nuclear Information System (INIS)

    Purpose: To prevent shocks exerted on a vent head due to pool-swell caused within a pressure suppression chamber (disposed in a torus configuration around the dry well) upon loss of coolant accident in BWR type reactors. Constitution: The following relationship is established between the volume V (m3) of a dry well and the ruptured opening area A (m2) at the boundary expected upon loss of coolant accident: V >= 30340 (m) x A Then, the volume of the dry well is made larger than the ruptured open area, that is, the steam flow rate of leaking coolants upon loss of coolant accident to decrease the pressure rise in the dry well at the initial state where loss of coolant accident is resulted. Accordingly, the pressure of non-compressive gases jetted out from the lower end of the downcomer to the pool water is decreased to suppress the pool-swell. (Ikeda, J.)

  3. An automated electrophysiological assay for differentiating Ca(v)2.2 inhibitors based on state dependence and kinetics.

    Science.gov (United States)

    Swensen, Andrew M; Niforatos, Wende; Vortherms, Timothy A; Perner, Richard J; Li, Tao; Schrimpf, Michael R; Scott, Victoria E; Lee, Lance; Jarvis, Michael F; McGaraughty, Steve

    2012-12-01

    Ca(V)2.2 (N-type) calcium channels are key regulators of neurotransmission. Evidence from knockout animals and localization studies suggest that Ca(V)2.2 channels play a critical role in nociceptive transmission. Additionally, ziconotide, a selective peptide inhibitor of Ca(V)2.2 channels, is clinically used to treat refractory pain. However, the use of ziconotide is limited by its low therapeutic index, which is believed, at least in part, to be a consequence of ziconotide inhibiting Ca(V)2.2 channels regardless of the channel state. Subsequent efforts have focused on the discovery of state-dependent inhibitors that preferentially bind to the inactivated state of Ca(V)2.2 channels in order to achieve an improved safety profile relative to ziconotide. Much less attention has been paid to understanding the binding kinetics of these state-dependent inhibitors. Here, we describe a novel electrophysiology-based assay on an automated patch platform designed to differentiate Ca(V)2.2 inhibitors based on their combined state dependence and kinetics. More specifically, this assay assesses inactivated state block, closed state block, and monitors the kinetics of recovery from block when channels move between states. Additionally, a use-dependent assay is described that uses a train of depolarizing pulses to drive channels to a similar level of inactivation for comparison. This use-dependent protocol also provides information on the kinetics of block development. Data are provided to show how these assays can be utilized to screen for kinetic diversity within and across chemical classes. PMID:22428804

  4. Identifying Bottom Contribution in Non-photonic Electron Spectra and v2 from Au+Au Collisions at RHIC

    International Nuclear Information System (INIS)

    We present a study on the spectra and elliptic flow v2 of electrons from heavy flavor (charm and bottom) decays with the relative contributions of charm and bottom hadrons given by the PYTHIA Monte Carlos simulations. We made a simultaneous fit to both measured non-photonic electron spectra and v2 distributions. The results suggest that the bottom contribution is not dominant for electron pT<5 GeV/c in the 200 GeV Au+Au collisions

  5. Enhancement in electrical conductivity of Li2O : B2O3 : V2O5 glasses

    Indian Academy of Sciences (India)

    R S Gedam; V K Deshpande

    2009-02-01

    The study of electrical conductivity of 30Li2O : (70 – ) B2O3 : V2O5 glass samples has been carried out. The results have been explained by dividing the temperature range into two regions. In region I, conductivity shows Arrhenius behaviour for all the samples. The conductivity increases with addition of V2O5. The results have been explained in the light of Anderson and Stuart Model. In region II, an anomalous enhancement in the conductivity is observed for all the samples up to certain temperature beyond which the conductivity decreases. The enhancement in the conductivity in the annealed glass sample has been attributed to nanocrystallization.

  6. Investigation of the Structural Variation after the Intercalation of Cetylpyridinium Chloride into V2O5 Xerogel

    Directory of Open Access Journals (Sweden)

    Elidia Maria Guerra

    2014-08-01

    Full Text Available A new hybrid material using vanadium pentoxide xerogel in different concentration of the cationic surfactant cetylpyridinium chloride (V2O5CPC is investigated. The insertion was accompanied by XRD, FTIR and SEM characterization. These studies revealed the presence of a lamellar structure for the V2O5CPC hybrid material in all concentrations of cetylpyridinium chloride. The intercalation reaction was evidenced on basis of the increase in the d-spacing as well as the displacement of the infrared bands toward lower energy levels. The CPC intercalation occurred by reorganize intermittently forming two domains within the matrix.

  7. Comparison of Structural and Electrochemical Properties of V2O5 Thin Films Prepared by Organic/Inorganic Precursors

    International Nuclear Information System (INIS)

    Vanadium pentoxide thin films were produced from organic and inorganic precursors by sol gel dip-coating method. Fourier transform infrared spectroscopy and UV Vis spectroscopy were made to figure out structural properties of the films. Electrochemical properties were investigated by cyclic voltammetry. The shape of the curves was in agreement with a typical diffusion controlled cyclic voltammograms of amorphous V2O5 films for a reversible lithium ion intercalation/deintercalation process showing yellow–green–blue multi-electrochromism. V2O5 films, synthesized from organic precursor, indicated lower band gap energy, higher charge capacity as well as homogeneous and low granule size compared to inorganic route

  8. Effect of the selective vasopressin V2 receptor antagonists in hepatic cirrhosis patients with ascites: a meta-analysis

    Directory of Open Access Journals (Sweden)

    Shao-hui TANG

    2013-07-01

    Full Text Available Objective To evaluate the efficacy and safety of selective vasopressin V2 receptor antagonists in the treatment of hepatic cirrhosis patients with ascites. Methods PubMed, EMBASE, Web of Science, The Cochrane Central Register of Controlled Trials, Database for Chinese Technical Periodical (VIP, Chinese Journal Full-Text Database (CNKI, and Wan Fang Digital Journal Full-text Database were retrieved to collect clinical randomized controlled trials of hepatic cirrhosis with ascites treated by selective vasopressin V2 receptor antagonists. Meta analysis was performed by using Review Manager 5.0. Results Nine randomized controlled trials including 1884 patients met the inclusion criteria. Meta-analysis showed that: 1 The selective vasopressin V2 receptor antagonists were associated with a significant reduction in body weight compared with placebo (WMD=–1.98kg, 95%CI:–3.24-–0.72kg, P=0.002. Treatment with selective vasopressin V2 receptor antagonists was associated with an improvement of low serum sodium concentration compared to placebo (WMD=3.74mmol/L, 95%CI: 0.91-6.58mmol/L, P=0.01. The percentage of patients with worsening ascites was higher in the group of patients treated with placebo (RR=0.51, 95%CI: 0.34-0.77, P=0.001. 2 The amplitude of increased urine volume was obviously higher in selective vasopressin V2 receptor antagonists group than in placebo group (WMD=1437.65ml, 95%CI: 649.01-2226.30ml, P=0.0004. The difference of serum creatinine in the selective vasopressin V2 receptor antagonists group was not statistically significant compared with the control group (WMD=–3.49μmol/L, 95%CI: –12.54¬5.56μmol/L, P=0.45. 3 There was no statistical significance between the two groups in the heart rate, systolic pressure, diastolic pressure and mortality (P>0.05. The rate of other adverse reactions was higher in the selective vasopressin V2 receptor antagonists group compared with that of placebo group (P=0.003. Conclusion

  9. Leptonic widths of heavy quarkonia: QCD/NRQCD matching for the electromagnetic current at O(\\alpha_s v^2)

    OpenAIRE

    Hart, A; von Hippel, G. M.; Horgan, R.R.

    2006-01-01

    We construct the S-wave part of the electromagnetic vector annihilation current to $O(\\alpha_s v^2)$, where $v$ is the non-relativistic quark velocity, for heavy quarks whose dynamics are described by the NRQCD action on the lattice. The NRQCD vector current for $Q\\bar{Q}$ annihilation is expressed as a linear combination of lattice operators with quantum numbers L=0, $J^P=1^-$, and the coefficients are determined by matching to the corresponding continuum current in QCD to$O(v^2)$ at one-loo...

  10. PRACTISE – Photo Rectification And ClassificaTIon SoftwarE (V.2.0

    Directory of Open Access Journals (Sweden)

    S. Härer

    2015-10-01

    Full Text Available Terrestrial photography combined with the recently presented Photo Rectification And ClassificaTIon SoftwarE (PRACTISE V.1.0 has proven to be a valuable source to derive snow cover maps in a high temporal and spatial resolution. The areal coverage of the used digital photographs is however strongly limited. Satellite images on the other hand can cover larger areas but do show uncertainties with respect to the accurate detection of the snow covered area. This is especially the fact if user defined thresholds are needed e.g. in case of the frequently used Normalised-Difference Snow Index (NDSI. The definition of this value is often not adequately defined by either a general value from literature or over the impression of the user but not by reproducible independent information. PRACTISE V.2.0 addresses this important aspect and does show additional improvements. The Matlab based software is now able to automatically process and detect snow cover in satellite images. A simultaneously captured camera-derived snow cover map is in this case utilised as in-situ information for calibrating the NDSI threshold value. Moreover, an additional automatic snow cover classification, specifically developed to classify shadow-affected photographs was included. The improved software was tested for photographs and Landsat 7 Enhanced Thematic Mapper (ETM+ as well as Landsat 8 Operational Land Imager (OLI scenes in the Zugspitze massif (Germany. The results have shown that using terrestrial photography in combination with satellite imagery can lead to an objective, reproducible and user-independent derivation of the NDSI threshold and the resulting snow cover map. The presented method is not limited to the sensor system or the threshold used in here but offers manifold application options for other scientific branches.

  11. PRACTISE - Photo Rectification And ClassificaTIon SoftwarE (V.2.1)

    Science.gov (United States)

    Härer, S.; Bernhardt, M.; Schulz, K.

    2016-01-01

    Terrestrial photography combined with the recently presented Photo Rectification And ClassificaTIon SoftwarE (PRACTISE V.1.0) has proven to be a valuable source to derive snow cover maps in a high temporal and spatial resolution. The areal coverage of the used digital photographs is however strongly limited. Satellite images on the other hand can cover larger areas but do show uncertainties with respect to the accurate detection of the snow covered area. This is especially the fact if user defined thresholds are needed, e.g. in case of the frequently used normalized-difference snow index (NDSI). The definition of this value is often not adequately defined by either a general value from literature or over the impression of the user, but not by reproducible independent information. PRACTISE V.2.1 addresses this important aspect and shows additional improvements. The Matlab-based software is now able to automatically process and detect snow cover in satellite images. A simultaneously captured camera-derived snow cover map is in this case utilized as in situ information for calibrating the NDSI threshold value. Moreover, an additional automatic snow cover classification, specifically developed to classify shadow-affected photographs, was included. The improved software was tested for photographs and Landsat 7 Enhanced Thematic Mapper (ETM+) as well as Landsat 8 Operational Land Imager (OLI) scenes in the Zugspitze massif (Germany). The results show that using terrestrial photography in combination with satellite imagery can lead to an objective, reproducible, and user-independent derivation of the NDSI threshold and the resulting snow cover map. The presented method is not limited to the sensor system or the threshold used in here but offers manifold application options for other scientific branches.

  12. Validation of ASTEC v2.0 corium jet fragmentation model using FARO experiments

    Energy Technology Data Exchange (ETDEWEB)

    Hermsmeyer, S., E-mail: stephan.hermsmeyer@ec.europa.eu; Pla, P.; Sangiorgi, M.

    2015-05-15

    Highlights: • Model validation base extended to six FARO experiments. • Focus on the calculation of the fragmented particle diameter. • Capability and limits of the ASTEC fragmentation model. • Sensitivity analysis of model outputs. - Abstract: ASTEC is an integral code for the prediction of Severe Accidents in Nuclear Power Plants. As such, it needs to cover all physical processes that could occur during accident progression, yet keeping its models simple enough for the ensemble to stay manageable and produce results within an acceptable time. The present paper is concerned with the validation of the Corium jet fragmentation model of ASTEC v2.0 rev3 by means of a selection of six experiments carried out within the FARO facility. The different conditions applied within these six experiments help to analyse the model behaviour in different situations and to expose model limits. In addition to comparing model outputs with experimental measurements, sensitivity analyses are applied to investigate the model. Results of the paper are (i) validation runs, accompanied by an identification of situations where the implemented fragmentation model does not match the experiments well, and discussion of results; (ii) its special attention to the models calculating the diameter of fragmented particles, the identification of a fault in one model implemented, and the discussion of simplification and ad hoc modification to improve the model fit; and, (iii) an investigation of the sensitivity of predictions towards inputs and parameters. In this way, the paper offers a thorough investigation of the merit and limitation of the fragmentation model used in ASTEC.

  13. Vectorization and improvement of nuclear codes (MEUDAS4, FORCE, STREAM V2.6, HEATING7-VP, SCDAP/RELAP5/MOD2.5, NBI3DGFN)

    International Nuclear Information System (INIS)

    Eight nuclear codes have been vectorized and modified to improve their performance. These codes are magnetic fluid equilibrium code MEUDAS4 (CR and FFT versions), the magnetic field analysis code FORCE, the three-dimensional heat fluid analysis code STREAM V2.6, the three-dimensional heat analysis code HEATING 7-VP, the severe accident transient analysis code SCDAP/RELAP 5/MOD 2.5 for light water reactors, the ion beam orbital analysis code NBI3DGFN, and a free electron laser analysis code. The speedup ratios of the vectorized versions to the original ones in scalar mode are 2.3-4.9, 1.9-5.4, 2.6-6.2, and 1.9 for the MEUDAS4, STREAM, FORCE, and free electron laser analysis code, respectively. The definition method of the computational regions in the HEATING7-VP is improved. The SCDAP/RELAP5/MOD2.5 is modified to use extended memory regions of the computer. In this report, outlines of the codes, techniques used in the vectorization and reorganization of the codes, verification of computed results, and improvement on the performance are presented. (author)

  14. Rod ejection accident 3D-dynamic analysis in Almaraz NPP with RELAP5/PARCS V2.7 coupled codes

    International Nuclear Information System (INIS)

    The Rod Ejection Accident (REA) belongs to the Reactivity Initiated Accidents (RIA) category of accidents, and it is part of the licensing basis accident analyses required for pressurized water reactors (PWR). The REA consist of a rod ejection due to the failure of its driving mechanism. The evolution is driven by a continuous reactivity insertion. In previous works, we have analyzed this transient in Almaraz NPP at different power levels at the beginning of cycle (BOC) and at the end of cycle (EOC) using the coupled code RELAP5-MOD3.3/PARCS v2.7. In this work, we present the results of the REA analysis at hot zero power at BOC with all control rods inserted. In the thermal-hydraulic model used, each fuel assemblies has been modelled as an independent channel, for that, the RELAP5 source code has been modified and recompiled to accept this large number of channels. The neutronic nodal discretization consists of 157 x 24 active nodes, considering 13 different fuel elements with 291 neutronic compositions. The cross-sections sets are obtained from CASMO4-SIMULATE3 using the SIMTAB methodology developed in UPV. The transient departs from an initially critical core, being the withdrawal speed of the control rod a typical bounding value. These analyses will allow knowing more accurately the PWR real plant phenomenology in the RIA most limiting conditions, in this way the conclusions will be realistic. The aim is to improve the understanding of these accidents using advanced methods. (authors)

  15. Management of nuclear knowledge on an international scale using a small university research reactor

    International Nuclear Information System (INIS)

    Full text: The Atominstitut Vienna operates a 250 kW TRIGA Mark-II reactor since March 1962 used for nuclear education and training in the fields of neutron- and solid state physics, nuclear technology, reactor safety, radiochemistry, radiation protection, dosimetry, low temperature physics and fusion research. During the past 20 years about 640 students graduated with a diploma - or PhD degree from the Atominstitut attached to the University of Technology Vienna. To perform nuclear relevant academic studies the Atominstitut offers about 100 highly specialised theoretical lectures and about 10 practical courses where students have to perform experiments in small groups of four on subjects mentioned above. Although the TRIGA reactor is a rather low power research reactor it is very easy and cheap to operate and an excellent tool to transfer knowledge and experience to the younger generation. This reactor is therefore not only used by other European universities such as University of Manchester or Bratislava Technical University but also by nuclear institutions such as the GRS/Germany, NPP Bohunice and NPP Mochovce for nuclear training. On an international scale the Atominstitut co-operates closely with the nearby located IAEA in international research projects, coordinated research programs (CRP) and supplying expert services. Regular training courses are carried out for the IAEA for Safeguard Trainees, fellowship places are offered for scientists from developing countries and staff members carry out expert missions to research centres in Africa, Asia and South America. In the past 20 years more than 120 IAEA fellows from all over the world have been trained at the Atominstitut. The fellows spend between one to twelve month at the Atominstitut and are integrated in the respective work program. Experience showed that out of this fellowship a long-term relation between the institutes continues. The paper focuses especially on the transfer of knowledge between

  16. NO-NH3-O2 reaction catalyzed by V2O5/AC at low temperatures——Effects of SO2, V2O5 loading and reaction temperature

    Institute of Scientific and Technical Information of China (English)

    朱珍平; 刘振宇; 牛宏贤; 刘守军

    2000-01-01

    The effects of SO2, V2O5 loading and reaction temperature on the activity of activated carbon supported vanadium oxide catalyst have been studied for the reduction of NO with NH3 at low temperatures (150-250℃). It is found that SO2 significantly promotes the catalyst activity. Both V2O5 loading and reaction temperature are vital to the promoting effect of SO2. The catalysts with V2O5 loadings of 1 -5 weight percent have a positive effect on the promotion of SO2, while the catalysts with V2O5 loadings of above 7 weight percent have not such an effect or show a negative effect. At lower temperatures (<180℃) SO2 poisons the catalyst but at higher temperatures promotes it. The reason of the SO2 promotion was also discussed; it may results from the formation of SO42- on the catalyst surface, which increases the surface acidity and hence the catalytic activity.

  17. Selective catalytic reduction of NO with NH3 over V2O5 supported on TiO2 and Al2O3: A comparative study

    Science.gov (United States)

    Huang, Xianming; Zhang, Shule; Chen, Huinan; Zhong, Qin

    2015-10-01

    This study aimed at investigating the interaction of V2O5 species with TiO2 and Al2O3 supports to understand the effect of supports on SCR reaction. Analysis by XRD, BET, UV-vis, and DFT theoretical calculations, XPS, EPR and in situ DRIFT showed that the two kinds of supports could interact with V2O5. The interaction of electron excitation and charge transfer of supports to V2O5 species was important to the formation of the reduced V2O5. These aspects increased the formation of superoxide ions that could improve the NO oxidation over V2O5/TiO2. It was responsible for the higher SCR catalytic activity of V2O5/TiO2 than V2O5/Al2O3.

  18. The interface transport of V 2O 5 and WO 3 into CaMo(W)O 4 stimulated by an electric field

    Science.gov (United States)

    Guseva, A.; Neiman, A.; Konisheva, E.; Trifonova, M.; Gorbunova, E.

    2002-06-01

    An electric field applied to the CaWO 4/V 2O 5, CaMoO 4/V 2O 5 and CaMoO 4/WO 3 systems causes grain boundary and surface transports of oxides having a low surface energy (V 2O 5 and WO 3) and their segregation on the grain surface. It was found that V 2O 5 penetrates to the inner surface of CaWO 4 much more intensively when the V 2O 5 briquette bears a negative potential: (-)V 2O 5|CaWO 4(+). The penetration of V 2O 5 and WO 3 to the inner surface of the CaMoO 4 ceramic is accompanied by a chemical interaction.

  19. KALIMER-600-clad Core Fuel Assembly Calculation using MATRA-LMR (V2.0) Code

    International Nuclear Information System (INIS)

    Since the sodium boiling point is very high, maximum cladding and pin temperatures are used for design limit condition in sodium cooled liquid metal reactor. It is necessary to predict accurately the temperature distribution in the core and in the subassemblies to increase the sodium coolant efficiency. Based on the MATRA code, which is developed for PWR analysis, MATRA-LMR has been developed for SFR. The major modifications are: the sodium properties table is implemented as subprogram in the code, Heat transfer coefficients are changed for SFR, te pressure drop correlations are changed for more accurate calculations, which are Novendstern, Chiu-Rohsenow-Todreas, and Cheng-Todreas correlations. This This report describes briefly code structure and equations of MATRA-LMR (Version 2.0), explains input data preparation and shows some calculation results for the KALIMER-600-clad core fuel assembly for which has been performed the conceptual design of the core in the year 2006

  20. DSNP models used in the pebble-bed HTGR dynamic simulation. V.2

    International Nuclear Information System (INIS)

    A detailed description is given of the components that were used in the DSNP simulation of the PNP-500 high temperature gas-cooled pebble-bed reactor. Each component presented in this report describes in detail the mathematical model that was used, and the assumptions that were made in developing the model. Most of the models were developed using basic physical principles with the simplication that could be justified on the basis of the requested accuracy. Most of the models were developed as either one dimensional or lumped parameter models. The heat transfer and flow correlations, which are mostly based on semiempirical correlations were either provided by KFA or were adapted from the available literature. A short description of DSNP is also given, with a comprehensive list of all the statements available in Rev. 4.1 of DSNP. (H.K.)

  1. Plasma physics and controlled nuclear fusion research 1994. V.2. Proceedings of the fifteenth international conference

    International Nuclear Information System (INIS)

    This is the second volume of the proceedings of the 15th International Atomic Energy Agency Conference on Plasma Physics and Controlled Nuclear Fusion Research held in Seville, Spain, from 26 September - 1 October 1994. Contained it volume 2 are the combined poster sessions on core plasma physics and divertor and edge physics (20 papers), the combined poster session on plasma heating and current drive and concept optimization (17 papers), the combined poster session on helical system physics, pinches and open systems (10 papers), as well as the oral papers on pinches and open systems (6 papers); the ITER project (19 papers); and on new devices, reactors and technology (24 papers). Refs, figs, tabs

  2. Metabolism of myristicin by Depressaria pastinacella CYP6AB3v2 and inhibition by its metabolite.

    Science.gov (United States)

    Mao, Wenfu; Zangerl, Arthur R; Berenbaum, May R; Schuler, Mary A

    2008-06-01

    Although methylenedioxyphenyl (MDP) compounds, such as myristicin, are useful in the management of insecticide-resistant insects, the molecular mechanisms for their action in mammals and insects have not been elucidated. In this study, GC-MS analyses of methanol extracts of foliage of wild parsnip (Pastinaca sativa) have identified myristicin as a substrate for CYP6AB3v2, an imperatorin-metabolizing cytochrome P450 monooxygenase from Depressaria pastinacella (parsnip webworm). In contrast with its strong inhibitory effects on many mammalian P450s, myristicin is effectively metabolized by CYP6AB3v2 (V(max) and K(m) of 97.9 pmol/min/pmol P450 and 17.9 microM, respectively) at a rate exceeding that recorded previously for imperatorin, the only other known substrate for this highly specialized enzyme. The myristicin metabolite of CYP6AB3v2 is 1-(3',4'-methylenedioxy-5'-methoxyphenyl)-2,3-epoxypropane. Molecular dockings have indicated that, unlike other epoxide metabolites of furanocoumarins, this epoxide metabolite is likely to remain in the CYP6AB3v2 catalytic site due to its low binding energy (-31.0 kcal/mol). Inhibition assays indicate that myristicin acts as a mixed inhibitor of this insect P450 and suggest that the epoxide metabolite may be an intermediate involved in the formation of P450-methylenedioxyphenyl complexes. PMID:18510976

  3. Adsorption of ethanol on V2O5 (010) surface for gas-sensing applications: Ab initio investigation

    Science.gov (United States)

    Qin, Yuxiang; Cui, Mengyang; Ye, Zhenhua

    2016-08-01

    The adsorption of ethanol on V2O5 (010) surface was investigated by means of density functional theory (DFT) with a combined generalized gradient approximation (GGA) plus Hubbard U approach to exploit the potential sensing applications. The adsorption configurations were first constructed by considering different orientations of ethanol molecule to V and O sites on the "Hill"- and "Valley"-like regions of corrugated (010) surface. It is found that ethanol molecule can adsorb on whole surface in multiple stable configurations. Nevertheless the molecular adsorption on the "Hill"-like surface is calculated to occur preferentially, and the single coordinated oxygen on "Hill"-like surface (O1(H)) acting as the most energetically favorable adsorption site shows the strongest adsorption ability to ethanol molecule. Surface adsorption of ethanol tunes the electronic structure of V2O5 and cause an n-doping effect. As a consequence, the Fermi levels shift toward the conductive bond increasing the charge carrier concentration of electrons in adsorbed V2O5. The sensitive electronic structure and the multiple stable configurations to ethanol adsorption highlight the high adsorption activity and then the potential of V2O5 (010) surface applied to high sensitive sensor for ethanol vapor detection. Further Mulliken population and Natural bond orbital (NBO) calculations quantify the electron transfer from the adsorbed ethanol to the surface, and correlates the adsorption ability of surface sites with the charge donation and dispersion.

  4. Optical spectroscopic study of the interplay of spin and charge in $alpha NaV_{2}O_{5}$

    NARCIS (Netherlands)

    Damascelli, A; Presura, C.; Marel, D. van der; Jegoudez, J.; Revcolevschi, A.

    2000-01-01

    Published in: Phys. Rev. B 61 (2000) 2535 Citing articles (CrossRef) citations recorded in [Science Citation Index] Abstract: We investigate the temperature dependent optical properties of NaV2O5, in the energy range 4meV-4eV. The symmetry of the system is discussed on the basis of infrared phonon s

  5. Psychometric Properties of the Brazilian 12-Item Short-Form Health Survey Version 2 (SF-12v2

    Directory of Open Access Journals (Sweden)

    Bruno Figueiredo Damásio

    2015-04-01

    Full Text Available The 12-Item Short-Form Health Survey, in its initial (SF-12 and revised form (SF-12v2 is a widely used measure to evaluate health-related quality of life (HRQoL. The present study evaluates the factor structure and reliability of the Brazilian version of the SF-12v2. Participants were 627 subjects (74.1% women, aged from 18 to 88 years (M = 38.6; SD = 13.16, from 17 Brazilian states. Confirmatory factor analyses suggested two pairs of error terms to be highly correlated (3a-3b; and 4a-4b. A qualitative inspection showed an overlap of content among these items. The respecified model presented adequate fit indices. Convergent validity was also tested with measures of health-related self-care, subjective happiness, life satisfaction, depression and self-efficacy. Expected correlations were found between the SF-12v2 and these measures. Results showed initial evidence in favor of using the SF-12v2 as a measure of physical and mental health in the Brazilian context.

  6. Uniform Nickel Vanadate (Ni3V2O8) Nanowire Arrays Organized by Ultrathin Nanosheets with Enhanced Lithium Storage Properties

    Science.gov (United States)

    Wang, Chang; Fang, Dong; Wang, Hong'En; Cao, Yunhe; Xu, Weilin; Liu, Xiaoqing; Luo, Zhiping; Li, Guangzhong; Jiang, Ming; Xiong, Chuanxi

    2016-02-01

    Development of three-dimensional nano-architectures on current collectors has emerged as an effective strategy for enhancing rate capability and cycling stability of the electrodes. Herein, a novel type of Ni3V2O8 nanowires, organized by ultrathin hierarchical nanosheets (less than 5 nm) on Ti foil, has been obtained by a two-step hydrothermal synthesis method. Studies on structural and thermal properties of the as-prepared Ni3V2O8 nanowire arrays are carried out and their morphology has changed obviously in the following heat treatment at 300 and 500 °C. As an electrode material for lithium ion batteries, the unique configuration of Ni3V2O8 nanowires presents enhanced capacitance, satisfying rate capability and good cycling stability. The reversible capacity of the as-prepared Ni3V2O8 nanowire arrays reaches 969.72 mAh·g-1 with a coulombic efficiency over 99% at 500 mA·g-1 after 500 cycles.

  7. Measurement of direct photon v_2 in sqrt(s_NN)=200 GeV Au+Au collisions

    CERN Document Server

    Adare, A; Aidala, C; Ajitanand, N N; Akiba, Y; Al-Bataineh, H; Alexander, J; Aoki, K; Aramaki, Y; Atomssa, E T; Averbeck, R; Awes, T C; Azmoun, B; Babintsev, V; Bai, M; Baksay, G; Baksay, L; Barish, K N; Bassalleck, B; Basye, A T; Bathe, S; Baublis, V; Baumann, C; Bazilevsky, A; Belikov, S; Belmont, R; Bennett, R; Berdnikov, A; Berdnikov, Y; Bickley, A A; Bok, J S; Boyle, K; Brooks, M L; Buesching, H; Bumazhnov, V; Bunce, G; Butsyk, S; Camacho, C M; Campbell, S; Chen, C -H; Chi, C Y; Chiu, M; Choi, I J; Choudhury, R K; Christiansen, P; Chujo, T; Chung, P; Chvala, O; Cianciolo, V; Citron, Z; Cole, B A; Connors, M; Constantin, P; Csanád, M; Csörgő, T; Dahms, T; Dairaku, S; Danchev, I; Das, K; Datta, A; David, G; Denisov, A; Deshpande, A; Desmond, E J; Dietzsch, O; Dion, A; Donadelli, M; Drapier, O; Drees, A; Drees, K A; Durham, J M; Durum, A; Dutta, D; Edwards, S; Efremenko, Y V; Ellinghaus, F; Engelmore, T; Enokizono, A; En'yo, H; Esumi, S; Fadem, B; Fields, D E; Finger, M; Finger, M; Jr.,; Fleuret, F; Fokin, S L; Fraenkel, Z; Frantz, J E; Franz, A; Frawley, A D; Fujiwara, K; Fukao, Y; Fusayasu, T; Garishvili, I; Glenn, A; Gong, H; Gonin, M; Goto, Y; de Cassagnac, R Granier; Grau, N; Greene, S V; Perdekamp, M Grosse; Gunji, T; Gustafsson, H -Å; Haggerty, J S; Hahn, K I; Hamagaki, H; Hamblen, J; Han, R; Hanks, J; Hartouni, E P; Haslum, E; Hayano, R; He, X; Heffner, M; Hemmick, T K; Hester, T; Hill, J C; Hohlmann, M; Holzmann, W; Homma, K; Hong, B; Horaguchi, T; Hornback, D; Huang, S; Ichihara, T; Ichimiya, R; Ide, J; Ikeda, Y; Imai, K; Inaba, M; Isenhower, D; Ishihara, M; Isobe, T; Issah, M; Isupov, A; Ivanischev, D; Jacak, B V; Jia, J; Jin, J; Johnson, B M; Joo, K S; Jouan, D; Jumper, D S; Kajihara, F; Kametani, S; Kamihara, N; Kamin, J; Kang, J H; Kapustinsky, J; Karatsu, K; Kawall, D; Kawashima, M; Kazantsev, A V; Kempel, T; Khanzadeev, A; Kijima, K M; Kim, B I; Kim, D H; Kim, D J; Kim, E; Kim, E J; Kim, S H; Kim, Y J; Kinney, E; Kiriluk, K; Kiss, Á; Kistenev, E; Kochenda, L; Komkov, B; Konno, M; Koster, J; Kotchetkov, D; Kozlov, A; Král, A; Kravitz, A; Kunde, G J; Kurita, K; Kurosawa, M; Kwon, Y; Kyle, G S; Lacey, R; Lai, Y S; Lajoie, J G; Lebedev, A; Lee, D M; Lee, J; Lee, K; Lee, K B; Lee, K S; Leitch, M J; Leite, M A L; Leitner, E; Lenzi, B; Li, X; Liebing, P; Levy, L A Linden; Liška, T; Litvinenko, A; Liu, H; Liu, M X; Love, B; Luechtenborg, R; Lynch, D; Maguire, C F; Makdisi, Y I; Malakhov, A; Malik, M D; Manko, V I; Mannel, E; Mao, Y; Masui, H; Matathias, F; McCumber, M; McGaughey, P L; Means, N; Meredith, B; Miake, Y; Mignerey, A C; Mikeš, P; Miki, K; Milov, A; Mishra, M; Mitchell, J T; Mohanty, A K; Morino, Y; Morreale, A; Morrison, D P; Moukhanova, T V; Murata, J; Nagamiya, S; Nagle, J L; Naglis, M; Nagy, M I; Nakagawa, I; Nakamiya, Y; Nakamura, T; Nakano, K; Newby, J; Nguyen, M; Nouicer, R; Nyanin, A S; O'Brien, E; Oda, S X; Ogilvie, C A; Oka, M; Okada, K; Onuki, Y; Oskarsson, A; Ouchida, M; Ozawa, K; Pak, R; Pantuev, V; Papavassiliou, V; Park, I H; Park, J; Park, S K; Park, W J; Pate, S F; Pei, H; Peng, J -C; Pereira, H; Peresedov, V; Peressounko, D Yu; Pinkenburg, C; Pisani, R P; Proissl, M; Purschke, M L; Purwar, A K; Qu, H; Rak, J; Rakotozafindrabe, A; Ravinovich, I; Read, K F; Reygers, K; Riabov, V; Riabov, Y; Richardson, E; Roach, D; Roche, G; Rolnick, S D; Rosati, M; Rosen, C A; Rosendahl, S S E; Rosnet, P; Rukoyatkin, P; Ružička, P; Sahlmueller, B; Saito, N; Sakaguchi, T; Sakashita, K; Samsonov, V; Sano, S; Sato, T; Sawada, S; Sedgwick, K; Seele, J; Seidl, R; Semenov, A Yu; Seto, R; Sharma, D; Shein, I; Shibata, T -A; Shigaki, K; Shimomura, M; Shoji, K; Shukla, P; Sickles, A; Silva, C L; Silvermyr, D; Silvestre, C; Sim, K S; Singh, B K; Singh, C P; Singh, V; Slunečka, M; Soltz, R A; Sondheim, W E; Sorensen, S P; Sourikova, I V; Sparks, N A; Stankus, P W; Stenlund, E; Stoll, S P; Sugitate, T; Sukhanov, A; Sziklai, J; Takagui, E M; Taketani, A; Tanabe, R; Tanaka, Y; Tanida, K; Tannenbaum, M J; Tarafdar, S; Taranenko, A; Tarján, P; Themann, H; Thomas, T L; Togawa, M; Toia, A; Tomášek, L; Torii, H; Towell, R S; Tserruya, I; Tsuchimoto, Y; Vale, C; Valle, H; van Hecke, H W; Vazquez-Zambrano, E; Veicht, A; Velkovska, J; Vértesi, R; Vinogradov, A A; Virius, M; Vrba, V; Vznuzdaev, E; Wang, X R; Watanabe, D; Watanabe, K; Watanabe, Y; Wei, F; Wei, R; Wessels, J; White, S N; Winter, D; Wood, J P; Woody, C L; Wright, R M; Wysocki, M; Xie, W; Yamaguchi, Y L; Yamaura, K; Yang, R; Yanovich, A; Ying, J; Yokkaichi, S; You, Z; Young, G R; Younus, I; Yushmanov, I E; Zajc, W A; Zhang, C; Zhou, S; Zolin, L

    2011-01-01

    The second Fourier component v_2 of the azimuthal anisotropy with respect to the reaction plane has been measured for direct photons at midrapidity and transverse momentum (p_T) of 1.15 GeV/c in Au+Au collisions at sqr(s_NN)=200 GeV. Previous measurements of this quantity for hadrons with p_T 6 GeV/c a reduced anisotropy is interpreted in terms of a path-length dependence for parton energy loss. In this measurement we find that for p_T > 4 GeV/c, the anisotropy for direct photons is consistent with zero and current uncertainties prevent a conclusive test of predicted small v_2 values from jet conversion and fragmentation photons. However, in the p_T < 4 GeV/c region, dominated by thermal photons, we find a substantial direct photon v_2 comparable to that of hadrons, whereas model calculations for thermal photons in this kinematic region significantly underpredict the observed v_2.

  8. Corrosion performance of heat resistant alloys in Na2SO4-V2O5 molten salts

    International Nuclear Information System (INIS)

    The corrosion resistant of three heat resistant alloys in molten vanadium pentoxide (V2O5), sodium sulfate (Na2SO4) and 80(mol%) V2O5-20Na2SO4 has been evaluated using the weight loss technique. Materials included Fe-25Cr-35Ni-0.45C, Fe-35Cr-45Ni with 0.12 and 0.45C alloys. Temperatures included 600, 700 and 800 deg. C for V2O5 and the 80V2O5-20Na2SO4 mixture, and 800, 900 and 1000 deg. C for Na2SO4. The tests were supplemented by detailed electronic microscopy and microanalysis studies. In all cases, the least resistant alloy was the Fe-25Cr-35Ni-0.45C one whereas the most resistant was the Fe-35Cr-45Ni-0.12C one. The results are discussed in terms of the acidic dissolution of the external protective Cr2O3, Al2O3 and SiO2 layers, by the salts and internal sulfidation

  9. MetalDetector v2.0: predicting the geometry of metal binding sites from protein sequence

    OpenAIRE

    Passerini, A.; Lippi, M.; P. Frasconi

    2011-01-01

    MetalDetector identifies CYS and HIS involved in transition metal protein binding sites, starting from sequence alone. A major new feature of release 2.0 is the ability to predict which residues are jointly involved in the coordination of the same metal ion. The server is available at http://metaldetector.dsi.unifi.it/v2.0/.

  10. High-frequency dielectric and magnetic anomaly at the phase transition in NaV2O5

    NARCIS (Netherlands)

    Smirnov, A.I.; Popova, M.N.; Sushkov, A.B.; Golubchik, S.A.; Khomskii, D.I.; Mostovoy, M.V.; Vasil’ev, A.N.; Isobe, M.; Ueda, Y.

    1999-01-01

    We found anomalies in the temperature dependence of the dielectric and magnetic susceptibility of NaV2O5 in the microwave and far-infrared frequency ranges. The anomalies occur at the phase transition temperature Tc, at which the spin gap opens. The real parts of the dielectric constants εa and εc d

  11. Survey of research reactors

    International Nuclear Information System (INIS)

    A survey of reasearch reactors based on the IAEA Nuclear Research Reactor Data Base (RRDB) was done. This database includes information on 273 operating research reactors ranging in power from zero to several hundred MW. From these 273 operating research reactors 205 reactors have a power level below 5 MW, the remaining 68 reactors range from 5 MW up to several 100 MW thermal power. The major reactor types with common design are: Siemens Unterrichtsreaktors, 1.2 Argonaut reactors, Slowpoke reactors, the miniature neutron source reactors, TRIGA reactors, material testing reactors and high flux reactors. Technical data such as: power, fuel material, fuel type, enrichment, maximum neutron flux density and experimental facilities for each reactor type as well as a description of their utilization in physics and chemistry, medicine and biology, academic research and teaching, training purposes (students and physicists, operating personnel), industrial application (neutron radiography, silicon neutron transmutation doping facilities) are provided. The geographically distribution of these reactors is also shown. As conclusions the author discussed the advantages (low capital cost, low operating cost, low burn up, simple to operate, safe, less restrictive containment and sitting requirements, versatility) and disadvantages (lower sensitivity for NAA, limited radioisotope production, limited use of neutron beams, limited access to the core, licensing) of low power research reactors. 24 figs., refs. 15, Tab. 1 (nevyjel)

  12. Department of reactor technology

    International Nuclear Information System (INIS)

    The activities of the Department of Reactor Technology at Risoe during 1979 are described. The work is presented in five chapters: Reactor Engineering, Reactor Physics and Dynamics, Heat Transfer and Hydraulics, The DR 1 Reactor, and Non-Nuclear Activities. A list of the staff and of publications is included. (author)

  13. RB reactor noise analysis

    International Nuclear Information System (INIS)

    Statistical fluctuations of reactivity represent reactor noise. Analysis of reactor noise enables determining a series of reactor kinetic parameters. Fluctuations of power was measured by ionization chamber placed next to the tank of the RB reactor. The signal was digitized by an analog-digital converter. After calculation of the mean power, 3000 data obtained by sampling were analysed

  14. Power grid operation risk management: V2G deployment for sustainable development

    Science.gov (United States)

    Haddadian, Ghazale J.

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

  15. Performance Test Results of the NASA-457M v2 Hall Thruster

    Science.gov (United States)

    Soulas, George C.; Haag, Thomas W.; Herman, Daniel A.; Huang, Wensheng; Kamhawi, Hani; Shastry, Rohit

    2012-01-01

    Performance testing of a second generation, 50 kW-class Hall thruster labeled NASA-457M v2 was conducted at the NASA Glenn Research Center. This NASA-designed thruster is an excellent candidate for a solar electric propulsion system that supports human exploration missions. Thruster discharge power was varied from 5 to 50 kW over discharge voltage and current ranges of 200 to 500 V and 15 to 100 A, respectively. Anode efficiencies varied from 0.56 to 0.71. The peak efficiency was similar to that of other state-of-the-art high power Hall thrusters, but outperformed these thrusters at lower discharge voltages. The 0.05 to 0.18 higher anode efficiencies of this thruster compared to its predecessor were primarily due to which of two stable discharge modes the thruster was operated. One stable mode was at low magnetic field strengths, which produced high anode efficiencies, and the other at high magnetic fields where its predecessor was operated. Cathode keeper voltages were always within 2.1 to 6.2 V and cathode voltages were within 13 V of tank ground during high anode efficiency operation. However, during operation at high magnetic fields, cathode-to-ground voltage magnitudes increased dramatically, exceeding 30 V, due to the high axial magnetic field strengths in the immediate vicinity of the centrally-mounted cathode. The peak thrust was 2.3 N and this occurred at a total thruster input power of 50.0 kW at a 500 V discharge voltage. The thruster demonstrated a thrust-to-power range of 76.4 mN/kW at low power to 46.1 mN/kW at full power, and a specific impulse range of 1420 to 2740 s. For a discharge voltage of 300 V, where specific impulses would be about 2000 s, thrust efficiencies varied from 0.57 to 0.63.

  16. Thermally Controlled V2O5 Nanoparticles as Cathode Materials for Lithium-Ion Batteries with Enhanced Rate Capability

    International Nuclear Information System (INIS)

    Graphical abstract: Display Omitted - Abstract: Vanadium pentoxide (V2O5) is an attractive cathode material for lithium-ion batteries (LIBs) because of its low cost, high abundance, and relatively high theoretical capacity (294 mA h g−1 with two lithium insertions/extractions per unit formula at 2.0–4.0 V). However, practical applications of V2O5 are hampered by its poor structural stability, low electrical conductivity, and slow ion diffusion kinetics, resulting in poor long-term cycling stability and rate performance. In this study, V2O5 nanoparticles are synthesized by a fast sol-gel method with citric acid (C6H8O7) at 400, 500, 600, and 700 °C. The thickness of the amorphous layers on the surface of the V2O5 nanoparticles is controlled from approximately 4–5 to 1–2 nm by adjusting the calcination temperature. The V2O5 nanoparticles synthesized at 600 °C show better electrochemical performances than the other samples. They exhibit a high initial discharge capacity of 276 mA h g−1 between 2.1 and 4.0 V at a rate of 1 C, and good capacity retention of 83% after 50 cycles. Even at 10 C rate, a discharge capacity of about 168 mA h g−1 is obtained after 100 cycles. The excellent rate capability and cycling stability are also achieved at current densities of 0.5–20 C

  17. Synthesis of γ-LiV2O5/VO2 mixture by thermal lithiation of vanadium (+4, +5) oxides

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    γ-LiV2O5/VO2 composites were synthesized through thermal lithiation reaction of mixed valence (+4, +5) vanadium oxides by lithium bromide. The phase evolution, morphology and discharge behavior at 500 ℃ were investigated by thermal gravimeter/differential thermal analysis (TG/DTA), X-ray diffraction(XRD), scanning electron microscopy(SEM) and specific surface analysis(BET). The mixed vanadium oxides are obtained from the pyrolytic decomposition of ammonium metavanadate, with V6O13 as main phase. Results show that the lithiation reaction begins at about 258 ℃, with γ-LiV2O5 and VO2(B) as the product.VO2(B) can transit to VO2(R) in the range of 400-500 ℃, following by grain growth and crystalline development with the increase of temperature and roasting time. The ratio of γ-LiV2O5 to VO2 can be modified by the additive content of lithium bromide. A lattice shearing model about the nucleation and growth of LixV2O5 and VO2(B) inside mixed valence (+4, +5) vanadium oxides (e.g. V6O13,V3O7) is speculated, which is relative to oxygen-/vacancy-diffusion and structural evolution inspired by lithium-insertion. The open-circuit voltage of 2.6 V is observed in the single cell of Li-B/LiCl-KCl/(γ-LiV2O5/VO2) at 500 ℃, and the specific capacities of

  18. Effect of additive V2O5 on sintering mechanism and properties of inert anodes of NiFe2O4 spinel

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    In order to improve the properties of inert anode of NiFe2O4 spinel, some additive V2O5 was added to raw materials-powders of NiO and Fe2O3. The powders of NiO, Fe2O3 were mixed with slight amount of V2O5, then they are moulded and sintered at 1200℃ for 6h. The sintering mechanism of powders of NiO and Fe2O3 with some additive V2 O5 was researched. The effect of V2O5 on density, electrical conductivity and corrosion resistance of inert anode of NiFe2O4 spinel was studied at the same time. The results show that the sintering mechanism for powders of NiO and Fe2O3 with some additive V2O5 is liquid-phase sintering. Additive V2O5 can increase the density of the samples, especially it improves the corrosion resistance of the samples remarkably. When the amount of V2 O5 is 1.5 %, the sample's corrosion rate is 1/80 of that of sample without V2 O5. But the electrical conductivity of the samples with V2O5 is lower than that of the sample without V2O5.

  19. Research Nuclear Reactors

    International Nuclear Information System (INIS)

    Published in English and in French, this large report first proposes an overview of the use and history of research nuclear reactors. It discusses their definition, and presents the various types of research reactors which can be either related to nuclear power (critical mock-ups, material test reactors, safety test reactors, training reactors, prototypes), or to research (basic research, industry, health), or to specific particle physics phenomena (neutron diffraction, isotope production, neutron activation, neutron radiography, semiconductor doping). It reports the history of the French research reactors by distinguishing the first atomic pile (ZOE), and the activities and achievements during the fifties, the sixties and the seventies. It also addresses the development of instrumentation for research reactors (neutron, thermal, mechanical and fission gas release measurements). The other parts of the report concern the validation of neutronics calculations for different reactors (the EOLE water critical mock-up, the MASURCA air critical mock-up dedicated to fast neutron reactor study, the MINERVE water critical mock-up, the CALIBAN pulsed research reactor), the testing of materials under irradiation (OSIRIS reactor, laboratories associated with research reactors, the Jules Horowitz reactor and its experimental programs and related devices, irradiation of materials with ion beams), the investigation of accident situations (on the CABRI, Phebus, Silene and Jules Horowitz reactors). The last part proposes a worldwide overview of research reactors

  20. Comparison of different variants of ATWS type accident calculations by means of the ATHLET and RELAP codes

    International Nuclear Information System (INIS)

    The results of thermal hydraulic analyses of anticipated transients without scram (ATWS) served as the basis for the new Emergency Operating Procedures for WWER-440/V-213 reactors. Because of the differences in the behavior of parameters in the calculations by the ATHLET code (for the Dukovany NPP) and by the RELAP code (for the Bohunice V2 plant), the major parameters in selected calculations were compared and the differences were explained on graphs. The starting calculations, in which no operator intervention was taken into account, were used for the comparison. (P.A.)