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Sample records for barc

  1. BARC highlights '88

    International Nuclear Information System (INIS)

    Highlights of research and development activities of the Bhabha Atomic Research Centre (BARC), Bombay during 1988 are presented in chapters entitled: Physical Sciences, Chemical Sciences, Materials and Materials Sciences, Radioisotopes, Reactors, Fuel Cycle, Radiological Safety and Protection, Electronics and Instrumentation, Engineering Services, and Life Sciences. Main thrust of the R and D activities of BARC is on nuclear power reactor technology and all stages of nuclear fuel cycle. Some activities are also in the frontier areas such as high temperature superconductivity and inertial confinement fusion. (M.G.B.). figs., tabs., coloured ills

  2. BARC highlights 86

    International Nuclear Information System (INIS)

    The Bhabha Atomic Research Centre (BARC), Bombay, is the premier multidisciplinary research establishment of the Department of Atomic Energy (India). It provides Research and Development (R and D) support to the nuclear programmes of the country. Some of its important R and D activities and achievements during 1986 are described in brief in the chapters entitled: Physical Sciences, Chemical Sciences, Materials and Materials Sciences, Life Sciences, Reactors, Fuel Cycle, and Electronics and Instrumentation. The entire text is illustrated with a number of diagrams and photographs. (M.G.B.)

  3. BARC solution for burn injuries

    CERN Multimedia

    2003-01-01

    The Bhabha Atomic Research Centre (BARC), has developed Hydrogel which is expected to be mass marketed soon in India. Dr Anil Kakodkar, Chairman of Atomic Energy Commission, said the product not only heals the wound, but also eliminates scars (1/2 page).

  4. Criticality calculations on BARC parallel processor- ANUPAM

    International Nuclear Information System (INIS)

    Parallel processing offers an increase in computational speed beyond the technological limitations of single processor systems. BARC has recently developed a parallel processing system (ANUPAM) based Multiple Instruction Multiple Data (MIMD) distributed memory architecture. In the work reported here, the sequential version of Monte Carlo code MONALI is modified to work on the ANUPAM for criticality calculations. The problem of random number generation in a parallel environment is handled using leapfrog technique. The code is modified to use variable number of slave processors. The parallel version of MONALI is used to calculate multiplication factor, fluxes and absorptions in one of the 8x8 fuel assemblies of IAEA BWR benchmark in 69 groups. To compare gain in execution time, the benchmark is also solved on LANDMARK and ND-570 systems (both serial) using the sequential version of the code. Speedup and efficiencies achieved on varying the number of slave processors are encouraging. (author). 5 refs., 1 tab

  5. Neutron beam research at BARC (India) and international collaboration

    Energy Technology Data Exchange (ETDEWEB)

    Ramanadham, M.; Mukhopadhyay, R. [Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai (India)

    2001-03-01

    Neutron beam research started in India more than four decades ago. Presently, the National Facility for Neutron Beam Research, NFNBR is located in Dhruva, a 100 MW research reactor. The entire facility, including the development of neutron detectors, is the result of indigenous efforts of the participating scientists from Bhabha Atomic Research Centre, BARC. NFNBR is accessible to national and international collaborations, and about forty research groups from various institutions have already availed this facility. Active collaboration with ISIS started since 1984, when the day-1 spectrometer, built at BARC, became operational at ISIS. The collaboration continued with the fabrication, at BARC, of parts for OSIRIS spectrometer. Many neutron beam researchers from BARC have carried out collaborative experiments using the neutron sources at USA, France, Germany, Switzerland, and Japan. (author)

  6. Advances in nuclear desalination in BARC

    International Nuclear Information System (INIS)

    As a part of our programme to improve the quality of life of our large population by systematic induction of nuclear energy, BARC has been engaged in R and D activities on desalination since 1970s. The desalination activities were part of a programme of setting up a number of demonstration plants for the energy intensive processes such as desalination of seawater, electrolytic production of hydrogen and electro thermal production of phosphorus. These activities are presently termed by IAEA as 'Non Electrical Application of Nuclear Energy'. Over a period of time, BARC has successfully developed desalination technologies based on multi-stage flash (MSF) evaporation, reverse osmosis (RO) and low temperature evaporation (LTE). In the field of thermal desalination, efforts are directed towards utilizing the low-grade heat and the waste heat as energy input for desalination. In membrane desalination, work is being carried out on newer pre-treatment methods such as use of ultra filtration, energy reduction and higher membrane life. Based on operational experience of MSF and RO plants at Trombay, BARC has undertaken establishment of the Nuclear Desalination Demonstration Project (NDDP), Kalpakkam. NDDP consists of a hybrid MSF-RO desalination plant of 6300 m3/d capacity (4500 m3/d MSF and 1800 m3/d Sea Water Reverse Osmosis (SWRO)) coupled to 2 x 170 MWe Pressurised Heavy Water Reactors (PHWRs) at MAPS, Kalpakkam. The requirements of seawater, steam and electrical power for the desalination plants are met from MAPS I and II which are around 1.5%, 1.0% and 0.5% of available at MAPS. The hybrid plant has provision for redundancy, utilization of streams from one to other and production of two qualities of products for their best utilization. The 1800 m3/d SWRO plant, which is already commissioned in August 2002, is designed to operate at relatively lower pressure (51.5 bar during 1st year and 54 bar during 3rd year) to save energy, employs lesser pre-treatment (because of

  7. Popularization of groundnut varieties through BARC-UASD collaboration

    International Nuclear Information System (INIS)

    To boost the productivity of groundnut, farmers need to have an access to improved seeds of the right variety, at the right time, at the right place, at an affordable price. The awareness and benefits of the improved varieties and quality seeds of groundnut was carried out by carefully planned co-ordinated educational systems such as field trials, demonstrations, field days, training farmers, interface meetings through the well established network of the University and mass media promotional tools. The BARC-UASD collaboration led to the popularization of BARC groundnut varieties like TAG-24, TG-26, TPG-41 and TDG-39 among the farming community of north Karnataka. (author)

  8. Investigation of UFO defect on DUV CAR and BARC process

    Science.gov (United States)

    Yet, Siew Ing; Ko, Bong Sang; Lee, Soo Man; May, Mike

    2004-05-01

    Photo process defect reduction is one of the most important factors to improve the process stability and yield in sub-0.18um DUV process. In this paper, a new approach to minimize the Deep-UV (DUV) Chemically Amplified Resist (CAR) and Bottom Anti-Reflective Coating (BARC) induced defect known as UFO (UnidentiFied Object) defect will be introduced. These defects have mild surface topography difference on BARC; it only exists on the wide exposed area where there is no photoresist pattern. In this test, Nikon KrF Stepper & Scanner and TEL Clean track were used. Investigation was carried out on the defect formulation on both Acetal and ESCAP type of photoresist while elemental analysis was done by Atomic Force Microscope (AFM) & Auger Electron Spectroscopy (AES). Result indicated that both BARC and photoresist induce this UFO defect; total defect quantity is related with Post Exposure Bake (PEB) condition. Based on the elemental analysis and process-split test, we can conclude that this defect is caused by lack of acid amount and low diffusivity which is related to PAG (Photo Acid Generator) and TAG (Thermal Acid Generator) in KrF photoresist and BARC material. By optimizing photoresist bake condition, this UFO defect as well as other related defect such as Satellite defect could be eliminated.

  9. Status report on the folded tandem ion accelerator at BARC

    Indian Academy of Sciences (India)

    P Singh; S K Gupta; M J Kansara; A Agarwal; S Santra; Rajesh Kumar; A Basu; P Sapna; S P Sarode; N B V Subrahmanyam; J P Bhatt; P J Raut; S S Pol; P V Bhagwat; S Kailas; B K Jain

    2002-11-01

    The folded tandem ion accelerator (FOTIA) facility set up at BARC has become operational. At present, it is used for elemental analysis studies using the Rutherford backscattering technique. The beams of 1H, 7Li, 12C, 16O and 19F have been accelerated up to terminal voltages of about 3 MV and are available for experiments. The terminal voltage is stable within ± 2 kV. In this paper, present status of the FOTIA and future plans are discussed.

  10. Bhabha Atomic Research Centre (BARC) annual report 1985-86

    International Nuclear Information System (INIS)

    The research and development (R and D) activities and accomplishments during the financial year 1985-86 of the Bhabha Atomic Research Centre, Bombay are reported. The BARC is a multidisciplinary laboratory engaged in R and D activities in the field of nuclear energy. The main thrust of the R and D activities of the Centre is aimed at: (1) achieving targets of India's nuclear power programme, (2) indigenisation of the various steps in the nuclear fuel cycle, (3) developing and propagating peaceful applications of nuclear science and technology in the country in fields such as agriculture, medicine and industry, (4) providing scientific support to regulatory functions associated with nuclear facilities and radiation protection activities in the country. The salient features of these R and D activities are described in the chapters entitled: (1) physical sciences, (2) chemical sciences, (3) materials and materials sciences, (4) life sciences, (5) radioisotopes, (6) reactors, (7) fuel cycle, (8) health and safety, (9) electronics and instrumentation, and (10) technical services. A list of publications by the staff-members during the report period is given at the end of each chapter. The R and D activities of the outstation units of BARC, namely, Nuclear Research Laboratory at Srinagar, High Altitude Research Laboratory at Gulmarg, Variable Energy Cyclotron Centre at Calcutta and Gauribidanur Seismic Array near Bangalore are also covered in the report. Other activities of the Centre include technology transfer and manpower training which are also described briefly. (M.G.B.)

  11. Control and monitoring of EXAFS beamline of Indus-2 at RRCAT remotely from BARC

    International Nuclear Information System (INIS)

    EXAFS Beam line of Indus-2 is being operated and managed by Spectroscopy Division, BARC. Experimental setup in Indus-2 experimental hall is required to be monitored and operated when beam is available at Indus-2. To facilitate remote monitoring and control of the experimental setup from BARC, necessary networking infrastructure has been commissioned. The setup is based on client-server architecture and is using LabView software as the application development tool. Vacuum is controlled and monitored remotely from BARC and data acquisition done at RRCAT for various parameters is transmitted to the other end. This is a unique application practically deployed on ANUNET. For providing dedicated, secured, reliable, high speed connectivity various options were explored. It was decided to use ANUNET network for this purpose. ANUNET is a DAE wide network connecting various units of DAE either by satellite based links or by leased links. Dedicated leased connectivity has been established between Spectroscopy Division, BARC and EXAFS Beam line, Indus-2. The connectivity does not intermix with the campus LANs of RRCAT and BARC, thus providing physical isolation, but at the same time addresses the user's requirement. IT security guidelines of the two units are also not compromised. (author)

  12. Research on refractory, reactive and rare metals in BARC

    International Nuclear Information System (INIS)

    -metallics for specific applications. The presentation will essentially attempt to give an account of the development of refractory, reactive and rare metals in BARC over the period of nearly fifty years. (author)

  13. Short term course on Particle Accelerator Facilities in BARC: lecture notes

    International Nuclear Information System (INIS)

    This course will focus on the working principles of different types of accelerators and the safety and regulatory aspects of the particle accelerators in BARC. We sincerely hope that the course will benefit all those involved in the design, operation, maintenance as well as regulation of the particle accelerators. The course will bring together all the stakeholders on a common platform to understand and communicate various aspects of particle accelerators. Papers relevant to INIS are indexed separately

  14. Installation and commissioning of Scandiflash-450 flash X-ray generator at BARC, Visakhapatnam

    International Nuclear Information System (INIS)

    Energetics and Electromagnetics Division, BARC, Visakhapatnam has possessed a Flash X-ray radiography (FXR) system, make: Scandiflash, Sweden. This installation and commissioning of the system has been done by ourselves. Few problems have been detected during installation and commissioning. The troubleshooting of the system has been done. Somewhere we needed to replace the original components by indigenously made one. The complete installation and commissioning has been reportedly as far as detailed possible. Presently the system is working with satisfaction. The installed facility is being used as one of the primary means of diagnostics in many of the ongoing experiments. (author)

  15. Evaluation of thermophysical and thermomechanical properties of aluminium matrix dispersion fuels at BARC

    International Nuclear Information System (INIS)

    Al-U alloy and Al-UAIx, Al-U3O8 and Al-U3Si2 composites are being extensively used all over the world as fuel for small, water-cooled, non-power research reactors. As part of 40 kWt KAMINI and 5 MWt and 10 MWt research reactor fuels development programme at Bhabha Atomic Research Centre (BARC), Bombay, out-of-pile properties of these fuels, namely, hot hardness, high temperature microstructure and thermal conductivity were evaluated in the temperature range of 300-900K. (author)

  16. Proceedings of the national symposium on BARC technologies for development of rural India

    International Nuclear Information System (INIS)

    For empowering Indian villages, science and technology (S and T) based eco-friendly work plan have to be evolved. Sustainable techno-economic growth of rural sector in a country of vast size such as India requires technology innovations and their ingenious adaptation. This can be achieved to a great extent by adopting such technologies for varied local conditions so that it can be applied quickly to enhance the quality of life of larger population. Considering the wealth of technology and innovative capability generated in BARC, as an off-shoot of R and D in nuclear energy and its applications in power and non-power areas, Department of Atomic Energy (DAE), India has launched - Societal Initiative for utilization of Non-Power Applications (NPAs) and Spin off technologies (Spin-offs) in the area of water, land, agriculture, food processing and urban-rural waste management. Within this framework of societal initiative, structured programme called 'AKRUTI - KRUTIK - FORCE' has been formulated and is being implemented by BARC for techno-economic growth of the rural sector, as one of the many schemes for large-scale deployment of NPAs and spin-offs. This symposium consisting of invited lectures and poster presentations covered the topics like food and agriculture, health and environment, energy and conservation. Papers relevant to INIS are indexed separately

  17. Variation of outdoor radon levels and gamma radiation with respect to meteorological parameter at BARC, Vizag

    International Nuclear Information System (INIS)

    Hourly outdoor radon concentration along with meteorological parameters were measured at eight locations in and around BARC, Vizag using radon monitoring system (Alpha Guard, Genitron make). The geometric means of outdoor radon levels were found to be in the range of 4-22 Bqm-3. The diurnal variation of outdoor radon concentration observed at each location indicates a possible dependence on the meteorological parameters. A build up of 2-16 fold is observed in early morning hours in outdoor radon concentration. The radon concentration is found to increase with increase in relative humidity. The radon concentration was also found to be inversely related to the atmospheric temperature with minimum radon concentration during afternoon hours, when the temperature was maximum. Similarly maximum radon concentration was observed in the early morning hours, when the temperature was minimum. Gamma radiation levels were also measured at eight locations in and around BARC, Vizag. The arithmetic means of gamma radiation observed in these locations were found to vary from 139-266 nGyh-1. The gamma radiation levels observed these locations were found to be independent of temperature and humidity for the measurement period of this study. (author)

  18. Indigenous development and performance evaluation of BARC aerodynamic size separator (BASS)

    CERN Document Server

    Singh, S; Khan, A; Mayya, Y S; Narayanan, K P; Purwar, R C; Sapra, B K; Sunny, F

    2002-01-01

    Commercially available cascade impactors, commonly used for aerodynamic size separation of aerosol particles, are based on the principle of inertial impaction. As of now, these instruments are imported at a cost of several lakhs of rupees; hence an effort has been made to develop an aerodynamic particle sizer indigenously in BARC. This unit, referred to as BARC Aerodynamic Size Separator (BASS), separates aerosols into seven size classes ranging from 0.53 mu m to 10 mu m and operates at a flow rate of 45 Ipm. Intercomparison studies between the standard Andersen Mark-II (Grasbey Andersen Inc.) impactor and BASS using nebulizer generated aerosols have consistently shown excellent performance by BASS in all respects. In particular, BASS yielded the parameters of polydisperse aerosols quite accurately. Experiments to evaluate the individual stage cut-off diameters show that these are within 8% of their designed value for all stages except the higher two stages which indicate about 30% lower values than the desig...

  19. Fabrication experience of aluminium clad aluminium matrix dispersion fuels at BARC

    International Nuclear Information System (INIS)

    Aluminium clad, aluminium matrix plate type dispersion fuels have been fabricated in BARC in recent years as part of fuel development programme for small non-power research reactors. The present paper describes the flowsheet developed for fabrication of Al-UAlx, Al-U3Si2 and Al-U3O8 fuels at BARC. The Al-20% U alloy fuel for KAMINI neutron radiography reactor was prepared by 'melting and casting' route, followed by picture framing and roll-bonding. For higher 'U' density fuels namely, Al-UAlx, Al-U3O8 and Al-U3Si2 the 'powder metallurgy' route was followed for preparation of fuel meat. The novel features in fabrication route were: addition of Zr for stabilizing UAl3 phase in Al-20% U alloy; x-ray radiography and microdensitometric scanning of radiographs for location of fuel outline inside fuel element and for confirming homogeneous distribution of fissile atoms; immersion ultrasonic testing for confirming good bonding between mating Al surface of the fuel plate. (author)

  20. Proceedings of the national symposium on BARC technologies for development of rural India

    International Nuclear Information System (INIS)

    Empowering villages with Science and Technology (S and T) based on eco-friendly work plan for sustainable Techno-Economic growth of rural sector in a country of vast size, technology innovations and adaptations have to be evolved. This can be achieved to a great measure particularly since such technology will fit with varied local conditions and can be applied quickly to enhance the quality of life of larger population. Considering the wealth of technology and innovative capability generated in BARC, as an off-shoot of R and D in Nuclear Energy and its applications in power and non-power areas, Department of Atomic Energy (DAE) has launched - Societal Initiative for utilization of Non-Power Applications (NPAs) and Spinoff technologies (Spinoffs) in the area of water, land, agriculture, food processing and urban-rural waste management. Within this framework of societal initiative, structured programme called 'AKRUTI - KRUTIK - FORCE' has been formulated and is being implemented by BARC for techno-economic growth of the rural sector, as one of the many schemes for large-scale deployment of NPAs and spinoffs. Bhabha Atomic Research Centre Officer's Association (BARCOA) is making a maiden attempt to hold a symposium where the scientists, technologists, agriculturists and the consumers will come on a common platform to discuss these issues. This symposium is organized to enable to take the fruits of technology to grass-root level to every villager in the remote corner and provide inclusive growth to the rural sector and tap the hidden innovative capability of large rural India. This symposium describes the various technologies developed indigenously by Bhabha Atomic Research Centre for the development of rural India. Papers relevant to INIS are indexed separately

  1. Meteorological analysis of very severe cyclonic storm Hudhud in and around BARC-Visakhapatnam in October 2014

    International Nuclear Information System (INIS)

    Meteorological features of 'Hudhud' for the active period October 11-13, 2014 monitored at BARC, Visakhapatnam site have been analyzed. Response from observatories and behavior of the rare event of a cyclone which crossed through Visakhapatnam is presented and discussed for information and record. This will be a useful input in planning and designing the safety features in the developmental activities proposed at this site. (author)

  2. Comparison of aerosol inhalation lung images using BARC and other nebulizers

    International Nuclear Information System (INIS)

    Various factors determine the site of inhaled aerosol deposition in the lungs. They are the size of aerosol the composition of carrier gas of the aerosol, the airflow rate, physico-chemical properties of the carrier gas or the aerosol, the shape and structure of the airways, and the body position during inhalation. Aerosol inhalation lung images were obtained in the same subjects using 99mTc-human serum albumin aerosol generated by 3 different aerosol generators each producing different-sized aerosol and 2 or 3 days apart from each study. The size of aerosol produced by an ultrasonic nebulizer (Mistogen) was 1.93 Micron in activity median aerodynamic diameter (AMAD) with its geometric standard deviation (σg) of 1.73, that by a jet nebulizer (Ultra Vent) was 1.04 micron in AMAD with its σg of 1.71, and that by our BARC nebulizer, a type of a jet nebulizer, was 0.84 micron in AMAD with its σg of 1.73. In addition Technegas was also applied to selected patients. The latter produced aerosol of less than 0.2 micron in size at the largest and the majority, say, 95% or more of the generated aerosol was less than 0.1 micron in size by electron Microscopy. Each subject inhaled aerosol in resting tidal breathing through a mouth-piece with a one way double J valve with the nose clipped in the sitting position. After inhaling approximately 2-3 mCi (74 to 111 MBq) in the thorax, four view lung images were taken: anterior, posterior, and right and left laterals. 300 K counts per view were collected. They were not only pictured on polaroid films as analogue data but also recorded and stored in a computer as digital data. In case of Technegas breathing it for the RV (residual volume) to the TLC (total lung capacity) level followed by breath-holding for 5 to 10 sec in duration was repeated 2 to 3 times as a breathing maneuver instead of tidal breathing. Otherwise deposition efficiency of Technegas is very little because of the small size of the Technegas. Representative 10 cases

  3. Distributed UHV system for the folded tandem ion accelerator facility at BARC

    International Nuclear Information System (INIS)

    The 6 MV Folded Tandem Ion Accelerator (FOTIA) Facility at the Nuclear Physics Division, BARC is operational and accelerated beams of both light and heavy ions are being used extensively for basic and applied research. An average vacuum of the order of 10-8-10-9 Torr is maintained for maximum beam transmission and minimum beam energy spreads. The FOTIA vacuum system comprises of about 55 meter long, 100 mm diameter beam lines including various diagnostic devices, two accelerating tubes and four narrow vacuum chambers. The cross sections of the vacuum chambers are 14mm x 24mm for 180 deg., 38mm x 60mm and 19 x 44 mm for the and 70 deg. and 90 deg. bending magnets and Switching chambers respectively. All the beam line components are UHV compatible, fabricated from stainless steel 304L grade material fitted with metal gaskets. The total volume ∼5.8 x 105 cm3 and surface area of 4.6 x 104 cm2, interspersed with total 18 pumping stations. The accelerating tubes are subjected to very high voltage gradient, 20.4 kV/cm, which requires a hydrocarbon free and clean vacuum for smooth operation of the accelerator. Vacuum interlocks are provided to various devices for safe operation of the accelerator. Specially designed sputter ion pumps for higher environmental pressure of 8 atmospheres are used to pump the accelerating tubes and the vacuum chamber for the 180 deg. bending magnet. Fast acting valves are provided for isolating main accelerator against accidental air rush from rest of the beam lines. All the vacuum readings are displayed locally and are also available remotely through computer interface to the Control Room. Vacuum system details are described in this paper

  4. Electron beam accelerator at BARC-BRIT complex - electron beam processing of materials and industrial utilization

    International Nuclear Information System (INIS)

    During the last decade, the 2MeV/20kW electron beam (EB) accelerator located at BARC-BRIT complex, Vashi has been successfully utilised for non-thermal applications to develop speciality products useful for the industry. Polymer materials are exposed to high energy electrons to induce crosslinking and degradation reactions in a number of industrial products without the use of external chemicals and additives. Various EB crosslinked products viz. PE O-rings, automotive components, automobile tyres, electrical insulations, etc have been found to be much superior in quality compared to those produced conventionally. A process has been developed to enhance colours in the polished diamonds and gem stones using EB irradiation at the facility which has attracted much attention in the Indian diamond industry as a value-addition process. Recycling of polymer waste processed under EB to produce microfine PTFE powder, to reuse in automobile industry etc. has shown good potential for the industrial use. The process feasibility both in terms of economics and technology have been amply demonstrated on a technological scale by installing special conveyors at our facility for irradiating various industrial products. Around 100 km cable insulations, 1.5 million PE O-rings and more than 40000 carats of polished diamonds have been processed in our facility over a period of time on commercial scale. Encouraged with the results, Indian private entrepreneurs have set up dedicated EB machines in some of the most significant industries producing wire and cables, electrical gadgets based on polymer composites, automobile tyres and diamonds. The products are unique in properties and are in some cases, became import substitutes. The industry is now fully geared up to adapt the technology by realising the advantages viz ease in adaptability, convenient, safe and environmental-friendly nature. Encouraged by the process demonstrations, while five EB accelerators were setup and are in operation

  5. BARC-35: A 35 group cross-section library with P3-anisotropic scattering matrices and resonance self-shielding factors

    International Nuclear Information System (INIS)

    A 35 group cross-section set with P3-anisotropic scattering matrices and resonance self-shielding factors has been generated from the basic ENDF/B-IV cross-section Library for 57 reactor elements. This library, called BARC35, is considered to be well suited for the neutronics and safety analysis of fission, fusion and hybrid systems. (author)

  6. Brachytherapy of intra ocular tumors using ′BARC I-125 Ocu-Prosta seeds′: An Indian experience

    Directory of Open Access Journals (Sweden)

    Vikas Khetan

    2014-01-01

    Full Text Available Aim: To report our experience of brachytherapy using ′BARC I-125 Ocu-Prosta seeds′ for the management of intraocular tumors with regard to tumor control, globe preservation visual outcome, and patient survival at Sankara Nethralaya, Chennai, India between September 2003 and May 2011. Materials and Methods: We reviewed records of 35 eyes of 35 patients who underwent ophthalmic brachytherapy between September 2003 and May 2011. Twenty-one cases had choroidal melanoma, nine had childhood retinoblastoma, two had adult-onset retinoblastoma, and there were one case each of vasoproliferative tumor, retinal angioma, and ciliary body melanoma. Brachytherapy was administered using a 15- or 20-mm gold plaque with or without a notch. Brachytherapy was the primary treatment modality in all tumors other than retinoblastoma, wherein brachytherapy was done post chemoreduction for residual tumor. Results: For choroidal melanomas, the mean radiation dose was 68.69 ± 15.07 (range, 47.72-94.2 Gy. The eye salvage rate was 13/20 (65% and tumor control rate was 16/20 (80% at an average follow-up of 24.43 ± 24.75 (range, 1.5-87.98 months. For retinoblastoma, the mean dose was 45.85 ± 3.90 (range, 39.51-50.92 Gy. The eye salvage rate and tumor control rate was 5/6 (83.3% at an average follow-up of 38.36 ± 31.33 (range, 4.14-97.78 months. All eyes with retinoblastoma needed additional focal therapy for tumor control and eye salvage. Conclusion: The results of this retrospective study confirms that the use of ′BARC I-125 Ocu-Prosta seeds′ in episcleral plaques to treat intraocular tumors offers a viable option for the management of intraocular cancers.

  7. Modified BARC nebulizer system for measuring mucociliary tracheal transport rate in smokers and in patients with chronic obstructive pulmonary disease

    International Nuclear Information System (INIS)

    A simple noninvasive method for in vivo monitoring of mucociliary tracheal transport rate (MTTR) is described. The technique is based on deposition of radioactive aerosols in the large airways of the lung and measuring their rate of movement as they are transported up the trachea. A technique for generating larger human serum albumin (HSA) radioaerosols, by using the BARC dry aerosol delivery system, is described. Qualitative data on bolus motion by cinescintigraphy and quantitative data for calculating the MTTR were obtained from a computer for 12 normal subjects, three asymptomatic smokers, four symptomatic smokers and 12 patients with chronic obstructive pulmonary disease (COPD). The mean MTTR was 4.11 + 0.84 mm/min in normals. Ten of the 12 COPD patients showed either a reduced MTTR or no motion of the boli. The motion as seen in cine mode was linear in all the 12 normals. Although MTTR in the remaining two patients with COPD was normal the bolus exhibited a spiral motion on cinescintigraphy. Asymptomatic smokers showed either reduced MTTR or spiral motion of the bolus, whereas all the symptomatic smokers showed reduced MTTR. It was observed that the movement of the boli in the symptomatic smokers and patients with COPD varied widely, showing, for example, regurgitation, spiral or axial motion, stasis and movement of the bolus from one bronchus to the other. (author). 17 refs, 3 figs, 2 tabs

  8. Development of AUC-based process at BARC for production of free-flowing and sinterable UO2 powder

    International Nuclear Information System (INIS)

    Ammonium uranium carbonate (AUC) process has been developed and industrially used in Germany for preparation of free-flowing and sinterable UO2 powder for fabrication of UO2 fuel pellets for light water reactors (LWR). Efforts are underway at Bhabha Atomic Research Centre (BARC) for developing AUC-based process which would yield free-flowing UO2 powder suitable for direct pelletisation and sintering to very high density (> 96% T.D.) UO2 fuel pellets for pressurised heavy water reactors (PHWRs) in India. The first phase of this work has been completed jointly by Chemical Engineering Division (ChED) and Radiometallurgy Division (RMD) in batches of 1.5 kg. It was possible to fabricate UO2 pellets of density 93-95% T.D. on a reproducible basis. At ChED, process parameters have been optimised for fabrication of AUC with suitable physical properties in batches of 1.5 kg (U), starting with nuclear pure uranyl nitrate solution. At RMD calcination parameters of AUC was optimised in batches of 500 g for obtaining free-flowing UO2 powder, suitable for direct pelletisation and sintering. The pelletisation and sintering have been carried out at Radiometallurgy Division in batches of 1-1.5 kg. The maximum achievable density of UO2 pellets has been in the range of 95.5-96% T.D. (author). 11 refs

  9. Micro-controller based fiber optic data telemetry system for the ion source of low energy accelerator facility at BARC

    International Nuclear Information System (INIS)

    The Low Energy Accelerator Facility (LEAF) is a 50 keV, high intensity, negative ion accelerator facility that has been set up indigenously at Nuclear Physics Division, BARC. This facility is capable of delivering a wide range of negative ion beams of both light and heavy ions across the periodic table using a SNICS II (Source of Negative Ion by Caesium Sputtering) source. A micro-controller based control and monitoring system has been developed exclusively for the ion source parameters of LEAF. The data control and monitoring system mainly targets acquiring the data from the field in the terms of parameters such as voltages and currents. There are processes which need to be monitored continuously in order to keep certain parameters under check. The microcontroller based fiber optic data telemetry system allows us to perform the aforesaid task. The voltages can be controlled and monitored by providing the inputs and receiving the feedback through a user friendly graphic user interface. With this system one can control the status as well as analog value of the high voltage power supplies like extractor, cathode, filament, focus line heater and oven. This system consists of Fiber optic transceiver, which is connected on serial port (RS 232C) of microcontroller as well as RS232 port of PC. The whole control system is reliable even in noisy environments including RF and worse EMI conditions. This compact modular design is implemented using low cost devices and allows easy and fast maintainability. In the paper, the details of the system are presented. (author)

  10. Study on the atmospheric dispersion of pollutant in the presence and absence of a hill for BARC, Trombay site

    International Nuclear Information System (INIS)

    Blocking effects generated by topographical features leads to complex flow patterns that might generate mean concentration distributions significantly different from those that might be expected from the mean flow in the absence of the complex terrain features for atmospheric releases of pollutants. The present paper deals with one such study of the effect of a hill on the atmospheric dispersion of pollutant for BARC, Trombay site. The study of wind flow as well as the atmospheric dispersion of pollutant in the presence of 130 m hill behind PP is found to be important to gauge the radiological consequences on population residing beyond this hill. The results of study of the effect of this hill on the wind flow and the concentration distribution of pollutants on the upwind and downwind side of the hill are presented in the paper. It is seen that the wind flow gets modified leading to deceleration in the upwind side of the hill due to terrain blocking, speed up at the top of the hill and deceleration behind the hill. In the absence of hill, flow remains uniform in the downwind direction. It is also found that in the presence of the hill, the released pollutant disperses more as compared to the absence of the hill. Because of the additional dispersion provided by the hill and also because of the elevated topography, the peak concentration value in the presence of hill is obtained at shorter distance when compared with the other case. The peak ground level concentration value found in the presence of hill is relatively higher; however, for the population residing at farther distances, the additional dilution provided by the hill reduces the ground level concentration. (author)

  11. $h^0(125GeV) \\to c \\bar{c}$ as a test case for quark flavor violation in the MSSM

    CERN Document Server

    Hidaka, K; Eberl, H; Ginina, E; Majerotto, W

    2015-01-01

    We calculate the decay width of $h^0(125GeV) \\to c \\bar{c}$ in the Minimal Supersymmetric Standard Model (MSSM) with non-minimal quark flavor violation (QFV) at full one-loop level. We adopt the $\\overline{\\rm DR}$ renormalization scheme. We study the effects of the mixing of the second and third squark generations (i.e. scharm-stop mixing) on the decay width, respecting the experimental constraints from B-meson data, the Higgs mass measurement and supersymmetric (SUSY) particle searches. We show that the decay width $\\Gamma (h^0 \\to c \\bar{c})$ at the full one-loop level is very sensitive to the SUSY QFV parameters. In a scenario with large scharm-stop mixing, the decay width can differ up to $\\sim \\pm 35\\%$ from its SM prediction. After taking into account the experimental and theoretical uncertainties of the decay width, we conclude that these QFV SUSY effects can be observed at a future $e^+ e^-$ collider such as ILC (International Linear Collider).

  12. BARC progress report - 1996

    International Nuclear Information System (INIS)

    This report summarises the various activities and research and development programmes of the different Divisions of the Bhabha Atomic Research Centre, Mumbai. The list of publications and paper presented at various conferences, symposia, workshops etc and papers published in various journals by the staff members of the different Divisions are also given. (author)

  13. BARC annual report 1987

    International Nuclear Information System (INIS)

    The report summarises the Research and Development (R and D) activities of the Bhabha Atomic Research Centre, Bombay, during 1987. These R and D activities are described in the chapters entitled: Physical Sciences, Chemical S ciences, Materials and Materials Sciences, Radioisotopes, Reactors, Fuel Cycle, Radiological Safety and Protection, Electronics and Instrumentation, Engineering Services, and Life Sciences. Activities in the fields of remote handling and robotics, technology transfer, and auxiliary activities like technical information, human resources and development etc. are dealt in the chapter entitled General. At the end of each chapter, a list of publications by the scientists in the corresp onding subject field is given. Some of the major highlights of the work during 1987 are: (1) DHRUVA reactor became fully operational at its rated capacity making neutrons available for isotope production and studies in neutron scattering and condensed matter, (2) R and D activities were extended to study h igh temperature superconductivity in both fundamental and applied aspects and (3) a laboratory for production of 32P-biomolecules was set up at the Centre for Cellular and Molecular Biology at Hyderabad. (M.G.B.)

  14. BARC highlights 1991

    International Nuclear Information System (INIS)

    Some of the important research and development (R and D) activities carried out at the Centre during the last two or three years are described in brief. The descriptions are arranged under the headings : Physical Sciences, Chemical Sciences, Material and Materials Science, Radioisotopes, Reactors, Fuel Cycle, Radiological Safety and Protection, Electronics and Instrumentation, Engineering Services, and Life Sciences. The text is illustrated with a number of photographs - some of them coloured. (M.G.B.)

  15. BARC progress report - 1998

    International Nuclear Information System (INIS)

    This report is a compilation of the progress in various major activities and Research and Development programmes of the different Divisions of the Bhabha Atomic Research Centre, Mumbai. The list of publications and papers presented at the various conferences, symposia, workshops and papers published in journal by the staff members of the Divisions are also given. (author)

  16. BARC progress report - 1997

    International Nuclear Information System (INIS)

    This report is a compilation of the progress in various major activities and Research and Development programmes of the different Divisions of the Bhabha Atomic Research Centre, Mumbai. The list of publications and papers presented at the various conferences, symposia, workshops and papers published in journal by the staff members of the Divisions are also given. (author)

  17. MIDDLE MIOCENE DEPOSITIONAL MODEL IN THE DRAVA DEPRESSION DESCRIBED BY GEOSTATISTICAL POROSITY AND THICKNESS MAPS (CASE STUDY: STARI GRADAC-BARCS NYUGAT FIELD

    Directory of Open Access Journals (Sweden)

    Tomislav Malvić

    2006-12-01

    Full Text Available Neogene depositional environments in the Drava depression can be classified in two groups. One group is of local alluvial fans, which were active during the period of Middle Miocene (Badenian extension through the entire Pannonian Basin. The second group is represented by continuous Pannonian and Pontian sedimentation starting with lacustrine environment of partly deep water and partly prodelta (turbidity fans and terminating at the delta plain sedimentation. The coarse-grained sediments of alluvial fans have the great hydrocarbon potential, because they often comprise reservoir rocks. Reservoir deposits are mostly overlain (as result of fan migration by pelitic seal deposits and sometimes including organic rich source facies. That Badenian sequences are often characterised by complete petroleum systems, what is confirmed by large number of oil and gas discoveries in such sediments in the Drava and other Croatian depressions. Alluvial environments are characterised by frequent changes of petrophysical properties, due to local character of depositional mechanism and material sources. In the presented paper, Stari Gradac-Barcs Nyugat field is selected as a case study for demonstrating the above mentioned heterogenic features of the Badenian sequences. Structural solutions are compared by maps of parameters related to depositional environment, i.e. porosity and thickness maps. Geostatistics were used for spatial extension of input dataset. The spatial variability of porosity values, i.e. reservoir quality, is interpreted by transition among different sub-environments (facies in the alluvial fan system.

  18. A Seven-Year Major and Trace Element Study of Rain Water in the Barcés River Watershed, A Coruña, NW Spain

    Science.gov (United States)

    Delgado, Jordi; Cereijo-Arango, José Luis; Juncosa-Rivera, Ricardo

    2016-04-01

    Precipitation constitutes an important source of soluble materials to surface waters and, in areas where they are diluted precipitation (either dry or wet) it can be the most relevant solute source. Certain trace elements may have a limited natural availability in soils and rocks although they can be important with respect the operation of different biogeochemical cycles, for the computation of local/regional atmospheric pollutant loads or from the global mass budget. In the present study we report the results obtained in a long-lasting (December 2008-December 2015) monitoring survey of the chemical composition of bulk precipitation as monthly-integrated samples taken at the headwaters of the Barcés river watershed (A Coruña, Spain). This location was selected based on the necessity of quantification of the chemical composition and elemental loads associated with the different water types (stream water, ground water and precipitation) contributing to the flooding of the Meirama lake. Available data includes information on meteorological parameters (air temperature, relative humidity, atmospheric pressure, wind speed and direction, total and PAR radiation and precipitation) as well as a wide bundle of physico-chemical (pH, redox, electrical conductivity, alkalinity, Li, Na, K, Mg, Ca, Sr, Mn, Fe, NH4, Cs, Rb, Ba, Zn, Cu, Sb, Ni, Co, Cr, V, Cd, Ag, Pb, Se, Hg, Ti, Sn, U, Mo, F, Cl, Br, SO4, NO3, NO2, Al, As, PO4, SIO2, B, O2, DIC, DOC) and isotopic (18Ov-smow and 2Hv-smow) constituents. The average pH of local precipitation is 5.6 (n=65) which is consistent with the expected value for natural, unpolluted rain water. Most of the studied elements (eg. Na, Ca, K, Mg, SiO2, etc.) shows significant increases in their concentration in the dry period of the year. That points towards a more significant contribution of dry deposition in these periods compared with the wet ones. The average electrical conductivity is about 67 S/cm while the average chloride

  19. Integrated Water Basin Management Including a Large Pit Lake and a Water Supply Reservoir: The Mero-Barcés Basin

    Science.gov (United States)

    Delgado, Jordi; Juncosa-Rivera, Ricardo; Hernández-Anguiano, Horacio; Muñoz-Ibáñez, Andrea

    2016-04-01

    use of lake water is acceptable from different points of view (water quality, legal constrains, etc.). Our results indicate that the joint use of the lake/reservoir system is feasible. Based on this and other complementary study, the basin water authorities has developed a project by which a 2.1 km uptake tunnel will be excavated in the next years to drain water from the lake towards the Barcés river and complement the water supply necessities of the Abegondo-Cecebre reservoir in case of hydric emergencies.

  20. Search for $H^0 \\rightarrow b \\bar{b}$ or $c \\bar{c}$ in association with a $W$ or $Z$ boson in the forward region of $pp$ collisions

    CERN Document Server

    The LHCb Collaboration

    2016-01-01

    The LHCb dataset consisting of proton--proton collisions recorded at $\\sqrt{s}=8$ $\\mathrm{TeV}$, corresponding to an integrated luminosity of 1.98 $\\pm$ 0.02 $fb^{-1}$, is used to search for a Higgs boson with a mass of 125 $\\mathrm{GeV}$, produced in association with a $W$ or $Z$ boson and decaying to a $b \\bar{b}$ or $c \\bar{c}$ pair. The final state considered is a pair of heavy flavour tagged jets and one or two high $p_T$ leptons (electrons or muons). No excess over the background expectation is found and upper limits on the product of cross section times branching fraction, with two heavy quarks from $H^0$ and one lepton from $W$/$Z$ in the $\\text {LHCb}$ acceptance $2 < \\eta < 5$, are set at $95\\% ~\\text{CL}$: \\begin{align} \\sigma (pp \\rightarrow W/Z + H^0 ) \\times \\mathrm{{\\cal B}}(H^0 \\to b \\bar{b}) < 1.6 ~ \\mathrm{pb}, \\end{align} \\begin{align} \\sigma(pp \\rightarrow W/Z + H^0 ) \\times \\mathrm{{\\cal B}}(H^0 \\to c \\bar{c}) < 9.4 ~ \\mathrm{pb}. \\end{align}

  1. Generation of aerosols: BARC nebulizer and others

    International Nuclear Information System (INIS)

    The concern with atmospheric pollution in recent times has focused attention on aerosols, their distribution pattern after inhalation and the kinetics of their deposition and exclusion from bronchial passages. The technique of radioaerosols for lung imaging is of recent origin. The procedure was proposed as a means of estimating regional ventilation and localizing areas of airway narrowing. The technique is an alternative in the face of non-availability of radioactive gases, especially in developing countries where the cost is the major factor due to economic reasons. Now, it is beyond doubt that radioaerosol lung studies are a potentially valuable tool in the evaluation of respiratory function in health and disease, especially to detect chronic obstructive pulmonary diseases. Also, the administration of a drug by aerosol inhalation provides a convenient method for the treatment of conditions affecting the respiratory system. This write-up will brief us about radioaerosol, its generation and characterisation

  2. Food preservation technologies developed at BARC

    International Nuclear Information System (INIS)

    Food irradiation is important as it is being used to disinfest food grains, pulses, wheat flour, rice, semolina, raisins etc; quarantining and shelf life increasing of fruits like mangoes; microbial decontamination of spices; sprout inhibition of tubers and bulbs; shelf life increasing and pathogen control of meat and fish. Category-IV type irradiators based on gamma rays exposure of food are currently being employed for this purpose. Cobalt-60 isotope is produced in the nuclear reactors. Isotope gives gamma rays as its nucleus is unstable. The gamma rays pass through the food items and inhibit sprouting of tubers and bulbs, kill bacteria, virus and the larvae of insects

  3. Accelerator mass spectrometry programme at BARC-TIFR pelletron accelerator

    International Nuclear Information System (INIS)

    Accelerator based mass spectrometry (ABMs) is an ultra sensitive means of counting individual atoms having sufficiently long half life and available in small amount. The 14 U D Pelletron Accelerator is an ideal machine to carry out ABMs studies with heavy isotopes like 36Cl and 129I. Cosmogenic radio isotope 36Cl is widely being detected using ABMs as it has got applications in ground water research, radioactive waste management, atmospheric 36Cl transport mechanism studies of Arctic Alpine ice core etc. As a part of the ongoing ABMs programme at 14UD Pelletron Accelerator Facility at Mumbai, a segmented gas detector developed for identification of 36Cl was tested for performance. Recently a beam chopper required for this measurement has been developed. Further progress made in this programme is discussed in this paper. (author)

  4. Production and fabrication of thorium fuels at BARC

    International Nuclear Information System (INIS)

    Thorium oxide can be consolidated by conventional powder metallurgy technique of compaction and sintering. Thorium oxide is a difficult material to sinter and even at a sintering temperature of 2000degC, the density achievable is not > 80% T.D. Hence, activated sintering with the use of additives is resorted to for achieving densities > 90% T.D. Sinterability of thoria powders obtained from different compounds such as hydroxide, hydrocarbonate, tannate, oxalate etc. has been thoroughly investigated. The effect of different additives such as CaO, CaF2, MgO, Nb2O5 on the sinterability of thoria has been extensively studied. With the addition of 0.25% Nb2O5, sintering temperature can be brought down to as low as 1150deg-1200degC. High density thoria pellets have been fabricated for use in CIRUS, DHRUVA, FBTR, PHWRs and Experimental Fission/Fusion Hybrid Systems. (author). 6 refs., 8 figs

  5. Development of scintillation and luminescent detectors at BARC

    International Nuclear Information System (INIS)

    Research and development work carried out at the Bhabha Atomic Research Centre, Bombay, in the field of radiation detectors for various applications, particularly in the area of scintillation and luminescent detectors is reviewed. The review is presented in the form of 7 articles. (author). figs

  6. Beam optics of the folded tandem ion accelerator at BARC

    Indian Academy of Sciences (India)

    S Santra; P Singh

    2002-07-01

    The beam optics of the 6 MV folded tandem ion accelerator, that has recently been commissioned at Bhabha Atomic Research Centre, Mumbai, is presented. Typical beam trajectories for proton and 12C beams under different conditions, are shown. The constraints on the design due to the use of the infrastructure of the Van de Graaff accelerator, which existed earlier, are discussed.

  7. Present status of linear induction accelerator development at BARC

    International Nuclear Information System (INIS)

    A Linear Induction Electron Accelerator of rating- 200 keV, 5 kA, 100ns, 10-100 Hz, is in the advanced stage of commissioning at Bhabha Atomic Research Centre. This paper presents a few experimental results while developing the various sub-systems of this accelerator. It comprises of 3-stage induction cavities, solid state modulator based command resonant charging system with high power SCR switching in 10-100 Hz to amorphous core based 2.5 kV/20 kV, 20μs pulse transformer, magnetic switches and DC choke along with 100 A DC reset current systems. (author)

  8. Utilization of the BARC critical facility for ADS related experiments

    Indian Academy of Sciences (India)

    Rajeev Kumar; R Srivenkatesan

    2007-02-01

    The paper discusses the basic design of the critical facility, whose main purpose is the physics validation of AHWR. Apart from moderator level control, the facility will have shutdown systems based on shutoff rods and multiple ranges of neutron detection systems. In addition, it will have a flux mapping system based on 25 fission chambers, distributed in the core. We are planning to use this reactor for experiments with a suitable source to simulate an ADS system. Any desired sub-criticality can be achieved by adjusting the moderator level. Apart from perfecting our experimental techniques, in simple configurations, we intend to study the one-way coupled core in this facility. Preliminary calculations, employing a Monte Carlo code TRIPOLI, are presented.

  9. Current programmes on physical metallurgy and related areas in BARC

    International Nuclear Information System (INIS)

    Current research and development programmes on physical metallurgy and related areas from the following Divisions of Bhabha Atomic Research Centre are included in this report : Atomic Fuels Division, High Pressure Physics Division, Metallurgy Division, Radio Metallurgy Division, Solid State Physics Division. Important publications corresponding to each activity have also been listed. (author)

  10. BARC studies in cold fusion (April-September 1989)

    International Nuclear Information System (INIS)

    The report is a compilation of accounts of investigations of various aspects of cold fusion phenomenon during the period April-September 1989 at the Bhabha Atomic Research Centre, Bombay. The report is divided into three parts, namely, Part A, Part B and Part C. Part A consists of 11 papers covering cold fusion through electrolysis channel, while Part B consists of 4 papers covering cold fusion through the route of deuterium loading in the gas phase. Part C consists 5 papers discussing theoretical aspects of cold fusion phenomenon. Some of the papers in the Part C are published as Journal articles. Results show that: (1) d-d fusion reaction does occur in both electrolytic and deuterium loaded palladium and titanium metal lattices at ambient temperature, (2) neutrons and tritium are produced at the same time, but overall neutron to tritium ratio is very low indicating that tritium is the main end product and cold fusion is 'aneutronic' in nature, (3) neutron emission follows Poisson distribution pattern i.e. neutrons are emitted one at a time, however, 15 to 20 per cent of emitted neutrons are generated in bunches or bursts, (4) cold fusion is essentially a surface phenomenon and (5) for detection of tritium in the products of cold fusion, autoradiography is a reliable technique. (M.G.B.)

  11. Large sample NAA work at BARC: Methodology and applications

    Energy Technology Data Exchange (ETDEWEB)

    Acharya, R., E-mail: racharya@barc.gov.i [Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085 (India); Swain, K.K. [Analytical Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085 (India); Sudarshan, K.; Tripathi, R.; Pujari, P.K. [Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085 (India); Reddy, A.V.R. [Analytical Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085 (India)

    2010-10-11

    Large sample neutron activation analysis (LSNAA) was carried out using thermal column facility of Apsara reactor at Bhabha Atomic Research Centre, Mumbai, India. The k{sub 0}-based internal monostandard NAA (IM-NAA) using in situ detection efficiency was used to analyze large and non-standard geometry samples of clay pottery, uranium ore and stainless steel. Elemental concentration ratios with respect to Na as a monostandard were used in the study of pottery and ore samples. For stainless steel sample of SS 304L, the absolute concentrations were calculated from concentration ratios by mass balance approach since all the major elements (Fe, Cr, Ni and Mn) were amenable to NAA. Applications of LSNAA in the above-mentioned three different areas are described in this paper.

  12. 36Chlorine accelerator mass spectrometry programme at BARC-TIFR pelletron accelerator. RSP-12

    International Nuclear Information System (INIS)

    Accelerator mass spectrometry (AMS) is an ultra sensitive means of counting individual atoms having sufficiently long half life and available in small amount. The 14 UD Pelletron Accelerator is an ideal machine to carry out AMS studies with heavy isotopes like 36Cl and 129I. Cosmogenic radio isotope 36Cl is widely being detected using AMS as it has got applications in ground water research, radioactive waste management, atmospheric 36Cl transport mechanism studies of Arctic Alpine ice core etc. As a part of the ongoing AMS programme at 14UD Pelletron Accelerator Facility, Mumbai, a segmented gas detector developed for identification of 36Cl was tested for performance. Recently a beam chopper required for this measurement has been developed. 36Cl measurements carried out to detect and measure the ratio of 36Cl to 35Cl in an irradiated sample and dated sample are reported in this paper

  13. Accelerator mass spectrometry programme at BARC-TIFR pelletron accelerator. PD-1-2

    International Nuclear Information System (INIS)

    Accelerator mass spectrometry (AMS) is an ultra sensitive means of counting individual atoms having sufficiently long half-life and available in small amount. The 14 UD Pelletron Accelerator is an ideal machine to carry out AMS studies with heavy isotopes like 36Cl and 129I. Cosmogenic radioisotope 36Cl is widely being detected using AMS as it has got applications in ground water research, radioactive waste management, atmospheric 36Cl transport mechanism studies of Arctic Alpine ice core etc . The AMS programme at the 14 UD Mumbai Pelletron Accelerator has taken off with the installation of the state of the art Terminal Potential Stabilizer setup and operation of the accelerator in Generating Volt Meter (GVM) mode. Feasibility studies have been carried out for detection/identification of 14C from a charcoal sample and 3He in natural Helium. As the primary interest of AMS programme at Mumbai Pelletron Accelerator is related to the cosmogenic nuclei, 36Cl and 129I, a segmented gas detector developed for identification of 36Cl was tested for performance. Recently a beam chopper required for this measurement has also been developed

  14. Experimental subcritical facility driven by D-D/D-T neutron generator at BARC, India

    International Nuclear Information System (INIS)

    Highlights: •Experimental subcritical facility BRAHMMA coupled to D-D/D-T neutron generator. •Preliminary results of PNS experiments reported. •Feynman-alpha noise measurements explored with continuous source. -- Abstract: The paper presents design of an experimental subcritical assembly driven by D-D/D-T neutron and preliminary experimental measurements. The system has been developed for investigating the static and dynamic neutronic properties of accelerator driven sub-critical systems. This system is modular in design and it is first in the series of subcritical assemblies being designed. The subcritical core consists of natural uranium fuel with high density polyethylene as moderator and beryllium oxide as reflector. The fuel is embedded in high density polyethylene moderator matrix. Estimated keff of the system is ∼0.89. One of the unique features of subcritical core is the use of Beryllium oxide (BeO) as reflector and HDPE as moderator making the assembly a compact modular system. The subcritical core is coupled to Purnima Neutron Generator which works in D-D and D-T mode with both DC and pulsed operation. It has facility for online source strength monitoring using neutron tagging and programmable source modulation. Preliminary experiments have been carried out for spatial flux measurement and reactivity estimation using pulsed neutron source (PNS) techniques with D-D neutrons. Further experiments are being planned to measure the reactivity and other kinetic parameters using noise methods. This facility would also be used for carrying out studies on effect of source importance and measurement of source multiplication factor ks and external neutron source efficiency φ∗ in great details. Experiments with D-T neutrons are also underway

  15. Role of Bhabha Atomic Research Center (BARC) parallel processing system in structural analysis of nuclear components

    International Nuclear Information System (INIS)

    Computational structural analysis of nuclear reactor components requires high speed computing systems. Parallel processing systems, such as ANUPAM developed at Bhabha Atomic Research Centre, have helped immensely in meeting this requirement. The implementation of structural integrity analysis code on ANUPAM is illustrated here by commissioning two in house codes TABS and FAIR. The parallelization strategies and the efficiency of ANUPAM are highlighted. (author). 6 refs., 3 figs

  16. Development of a terminal voltage stabilization system for the FOTIA at BARC

    Indian Academy of Sciences (India)

    M J Kansara; P Sapna; N B V Subrahmanyam; J P Bhatt; P Singh

    2002-11-01

    A terminal voltage stabilization system for the folded tandem ion accelerator (FOTIA) was developed and is in continuous use. The system achieves good voltage stabilization, eliminates ground loops and noise interference. It incorporates a correcting circuit for compensating the mains frequency variations in the GVM amplifier circuit. The present system has two modes of operation namely GVM control mode and slit control mode. A voltage stability of about ± 2 kV has been achieved. In this paper, some of the salient features of the voltage stabilization system are discussed.

  17. Track etch membranes (TEMs) for separation sciences from BARC-TIFR Pelletron accelerator

    International Nuclear Information System (INIS)

    Track etch membranes (TEMs) program at 14 UD Pelletron accelerator at TIFR, Mumbai, India using 25 micron thick polyethylene terepthalate film is described. Large scale preparation of TEMs by scanning heavy ion beams using a electromagnetic scanner and rolling mechanism using a geared D.C. motor and vacuum rotary feed through are presented. The selection of ions of suitable energy and etching parameters for making various pore sizes were investigated using Rutherford scattered beam from Pelletron accelerator. Pore size and pore density were measured using scanning electron microscope. Scanning width up to 35 cm and irradiation up to 22 m were successfully carried out using this facility. Some applications carried out using these membranes are also mentioned. (author)

  18. Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre (BARC, Mumbai 400085, India

    Directory of Open Access Journals (Sweden)

    Ashok Badigannavar

    2015-08-01

    Full Text Available Phytic acid is the major storage form of phosphorus in cereals. It binds with nutritionally important metals and affects mineral bioavailability. The present study analyzed phytic acid, inorganic phosphorus (IP content, seed weight, and grain yield in 98 sorghum landraces and varieties grown in two environments to evaluate genotypic and environmental effects and to determine trait stability. Genotypic effects and genotype × interaction were significant for phytic acid concentration and yield components. A promising landrace, Malkhed-1, had the lowest phytic acid (0.015 mg g− 1 concentration, with a higher yield (70.02 g plant− 1, than the check variety M-35-1 in both environments. Similarly, among the varieties, Phule Maulee showed the lowest phytic acid (0.07 mg g− 1 and a higher grain yield of 53.15 g plant− 1 in both environments. Phytic acid and IP were negatively correlated (r = − 0.34, whereas grain yield and seed weight were positively correlated (r = 0.20. Cluster analysis based on seed phosphorus traits and yield components identified five and six clusters, respectively. Genotypes containing low phytic acid with high yield identified in this study would be helpful for increasing the bioavailability of mineral nutrients.

  19. Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre (BARC), Mumbai 400085, India

    OpenAIRE

    Ashok Badigannavar; Girish, G; T.R. Ganapathi

    2015-01-01

    Phytic acid is the major storage form of phosphorus in cereals. It binds with nutritionally important metals and affects mineral bioavailability. The present study analyzed phytic acid, inorganic phosphorus (IP) content, seed weight, and grain yield in 98 sorghum landraces and varieties grown in two environments to evaluate genotypic and environmental effects and to determine trait stability. Genotypic effects and genotype × interaction were significant for phytic acid concentration and yield...

  20. Generation of ozone and safety aspects in an accelerator facility of BARC

    International Nuclear Information System (INIS)

    Industrial electron beam accelerators up to 10 MeV are commonly employed for different applications. During normal operation of an accelerator, the principal hazard is the high radiation level produced. Experiments and applications in which the electron beam is used to irradiate materials outside the accelerator vacuum system are associated with problems such as radiation damage and production of considerable quantities of ozone. The possible generation of ozone during the operation of an electron beam accelerator is of special interest due to reactivity, corrosivity and the toxic characteristics of ozone. Industrial hygiene surveys were conducted to estimate the airborne concentration of ozone during operations of the electron beam accelerator (Type: ILU-6; 2 MeV; 20 KW) at varied operating parameters. The ozone concentration in the accelerator room was measured at different powers of the accelerator and the ozone decay pattern was also observed after beam shut down. Ozone in the accelerator room was measured by different methods such as colorimetry using neutral buffered potassium iodide, chemiluminescence method using ethylene and by using electrochemical sensor. An air velocity meter was used to measure the linear air velocity across the exhaust grills and the number of air changes available in the accelerator room was calculated. Necessary control measures were suggested to keep the occupational exposure of the personnel to ozone concentrations well within the Threshold Limit Values. (author)

  1. BARC 2009 Annual Report TO NC-1037: Genetic and functional genomic approaches to improve production and quality of pork

    Science.gov (United States)

    The NC-1037 project addresses “Genetic and functional genomic approaches to improve production and quality of pork.” It has 2 objectives: 1) Further understand the dynamic genetic mechanisms that influence production efficiency and quality of pork; and 2) Discover genetic mechanisms controlling anim...

  2. An information theory application to improve understanding of subsurface flow and transport conditions at the BARC OPE3 site

    Science.gov (United States)

    Improving understanding of subsurface conditions includes comparison and discrimination of concurrent models. Additional observations can be useful for that purpose. The objective of this work was to implement and test a novel method for optimization of selecting locations for additional observation...

  3. Analysis of meteorological parameters and its impact on atmospheric dispersion of 41Ar plume at BARC site

    International Nuclear Information System (INIS)

    A study on atmospheric dispersion of 41Ar plume was carried out considering the influence of meteorological parameters at Bhabha Atomic Research Centre site. A comparative analysis has been presented taking into account of two different observation sessions. During normal operation of research reactors, 41Ar as activation product, is getting released (below authorized discharge limit) at Bhabha Atomic Research Centre site. The external exposure during the passage of the radioactive plume was estimated using measurement of radiation field by installing Gamma-tracers at different locations. To establish a correlation and to assess the plume behavior, meteorological data and dose rate data from Gamma-tracers was collected at the same time interval

  4. PLC-based control system for 10 MeV linear accelerator (LCS) at EBC Kharghar, BARC

    International Nuclear Information System (INIS)

    Currently the 10 MeV Linac is being used for different research and industrial applications. The control system in operation was developed using CAMAC based Data Acquisition System (DAS) and Hard-wired Interlock System. It is proposed to replace the CAMAC system with a state-of-the-art indigenously developed Programmable Logic Controller (PLC) that is verified to the level of a Class IB computer-based system used in nuclear power plants. A PLC node comprises of two VME bus based CPU boards (PowerPC MPC7447, 600MHz) working in redundant mode. The inputs and outputs are common to both CPUs. The I/O boards are hot swappable and intelligent. An intelligent Ethernet board is used for communication with a PC running the SCADA software and industry standard communication protocols drivers. The PLC hardware and software has undergone rigorous verification and validation. A user-friendly 'Application Development Environment' is provided to the process engineer for building the application using pre-defined function blocks. The LCS developed using PLC is to be used for operating the Linac irradiation facility, remotely as well as locally in a fail-safe mode, with sequential start-up and sequential shut-down. Apart from system status monitoring, data archiving, alarm generation and setpoint adjustments, it monitors the important parameters and trips the Gun Modulator High Voltage (GM HV), the Klystron Modulator High Voltage (KM HV) and the Electron Gun Power Supply (EG PS) on fault conditions. (author)

  5. Radiation hazards control activities in BARC and other DAE units in Bombay and Indore: annual report 1994

    International Nuclear Information System (INIS)

    The radiation hazards control activities of units of Radiation Safety Systems Division stationed at different plants and facilities of Bhabha Atomic Research Centre and other units of Department of Atomic Energy in Bombay are briefly summarised. The activities are reported plantwise and include the following: (i) nature of radioactive operations, (ii) radiological status of the plant, (iii) personnel exposure data including collective and average exposures, (iv) effluent discharges, (v) waste disposal data, and (vi) safety related unusual occurrences and special problems, if any. Important operations for which extensive radiation safety surveillance was provided during the year 1994 are included. During the year 4319 persons were provided with radiation safety coverage at 25 different facilities. The collective dose and the average individual dose for the year 1994 are 6.08 man-Sv and 1.41 mSv respectively. Trends in personnel radiation exposure for a longer period i.e. from 1981 onwards are shown graphically. The figure also shows a steady trend in collective as well as average doses. The major contribution to dose comes from the following facilities: Plutonium Plant, Thorium Plant, Cirus, Radiological Laboratories and Dhruva in the decreasing order. (author). refs., tabs., 1 fig

  6. Long-term evaluation of 'BARC 68Ge/68Ga generator' based on the nanoceria-polyacrylonitrile composite sorbent.

    Science.gov (United States)

    Chakravarty, Rubel; Chakraborty, Sudipta; Ram, Ramu; Dash, Ashutosh; Pillai, M R A

    2013-10-01

    This article describes the long-term evaluation of a nanoceria-polyacrylonitrile (CeO2-PAN) composite sorbent-based (68)Ge/(68)Ga generator reported. This generator used the new CeO2-PAN composite sorbent for preparation of the (68)Ge/(68)Ga generator. Since this sorbent has not been previously evaluated, a thorough long-term evaluation of the performance of the generator is necessary to ensure its applicability for clinical practice. The performance of the generator was evaluated in terms of (68)Ga yield, (68)Ge breakthrough, radioactive concentration of the (68)Ga solution, and suitability of the (68)Ga for the preparation of (68)Ga-labeled tracers. The (68)Ge/(68)Ga generator was able to provide a (68)Ga activity with consistent yields (>70%) and having acceptable radionuclidic (<10(-4)% of (68)Ge breakthrough), radiochemical, and chemical purities for an extended period of time. The eluted (68)GaCl3 is useful for the majority of the (68)Ga complexation chemistry. PMID:23745686

  7. Manpower Development to Support Indian Graduate Training School Program of BARC and its Incorporation in University System

    International Nuclear Information System (INIS)

    Conclusions: • Nuclear technology is multidisciplinary, knowledge intensive, and its education and training are constrained by unusual measures demanded by the concerns about radiation and nuclear safety, physical protection of nuclear materials and facilities, and safeguards to prevent diversion of nuclear material. • This requires vast faculty resources as also extraordinary and expensive infrastructure for conducting nuclear education making the task of human resource development in nuclear science and technology a challenging one. • The human resource for the nuclear energy programme in India so far has therefore been developed in-house in the DAE. • However, large requirement of manpower to take forward the growing nuclear energy programme in the country can be met only by extending concurrently the reach of the human resource development activity in nuclear science and technology. • The DAE is therefore supporting the university system in India, and integrating the existing training program with the university system. • It may be emphasized that nuclear education, being a means of preservation and transmission of explicit knowledge, is just one component of nuclear knowledge management (NKM). • The NKM also involves creation of mechanisms to preserve and transmit implicit and tacit knowledge

  8. NLO QCD Corrections for $J/\\psi+ c + \\bar{c}$ Production in Photon-Photon Collision

    CERN Document Server

    Chen, Zi-Qiang; Qiao, Cong-Feng

    2016-01-01

    The $\\gamma+\\gamma\\rightarrow J/\\psi+c+\\bar{c}$ inclusive process is an extremely important subprocess in $J/\\psi$ photoproduction, like at LEP\\uppercase\\expandafter{\\romannumeral2} or various types future electron-positron colliders. In this work we perform the next-to-leading(NLO) QCD corrections to this process in the framework of non-relativistic QCD(NRQCD) factorization formalism, the first NLO calculation for two projectiles to 3-body quarkonium inclusive production process. By setting the center-of-mass energy at LEP\\uppercase\\expandafter{\\romannumeral2}, the $\\sqrt{s}=197$ GeV, we conduct analyses of the $p_t^2$ distribution and total cross section of this process at the NLO accuracy. It turns out that the total cross section is moderately enhanced by the NLO correction with a $K$ factor of about 1.46, and hence the discrepancy between DELPHI data and color-singlet(CS) calculation is reduced while the color-octet(CO) contributions are still inevitable at this order. At the future Circular Electron-Pos...

  9. Information systems in the field of nuclear science and technology, with special reference to Library and Information Services of BARC and its role in the development of atomic energy for peaceful purposes in India

    International Nuclear Information System (INIS)

    Information systems in the field of nuclear science and technology are described. A detailed description is given of the various services and activities of : (1) the Centre for Documentation (CID) of the EURATOM and (2) The Technical Information Program of the USERDA. The objectives and operation of the International Nuclear Information Systems (INIS) established by the IAEA are discussed. The information needs in the field of nuclear science and technology in India are met by the Library and Information Services (L and IS) of the Bhabha Atomic Research Centre, Bombay. Its various library facilities, documentation and information services are described in detail. It also acts as the INIS inputting centre for Indian nuclear literature. (M.G.B.)

  10. A study on effect of point-of-use filters on defect reduction for advanced 193nm processes

    Science.gov (United States)

    Vitorino, Nelson; Wolfer, Elizabeth; Cao, Yi; Lee, DongKwan; Wu, Aiwen

    2009-03-01

    Bottom Anti-Reflective Coatings (BARCs) have been widely used in the lithography process for decades. BARCs play important roles in controlling reflections and therefore improving swing ratios, CD variations, reflective notching, and standing waves. The implementation of BARC processes in 193nm dry and immersion lithography has been accompanied by defect reduction challenges on fine patterns. Point-of-Use filters are well known among the most critical components on a track tool ensuring low wafer defects by providing particle-free coatings on wafers. The filters must have very good particle retention to remove defect-causing particulate and gels while not altering the delicate chemical formulation of photochemical materials. This paper describes a comparative study of the efficiency and performance of various Point-of-Use filters in reducing defects observed in BARC materials. Multiple filter types with a variety of pore sizes, membrane materials, and filter designs were installed on an Entegris Intelligent(R) Mini dispense pump which is integrated in the coating module of a clean track. An AZ(R) 193nm organic BARC material was spin-coated on wafers through various filter media. Lithographic performance of filtered BARCs was examined and wafer defect analysis was performed. By this study, the effect of filter properties on BARC process related defects can be learned and optimum filter media and design can be selected for BARC material to yield the lowest defects on a coated wafer.

  11. Measurement of direct CP violation in b → sc$\\bar{c}$ and b → d$\\barc{c}$ quark transitions using B+ → J/psiK+ and B+→ J/Ψπ+ decays

    Energy Technology Data Exchange (ETDEWEB)

    Holubyev, Kostyantyn [Lancaster Univ. (United Kingdom)

    2008-11-01

    This thesis describes the measurement of the direct CP violation in the b → sc$\\bar{c}$ transition using the decay B+ → J/ΨK+, and in the b → dc$\\bar{c}$ transition using the decay B+ → J/Ψπ+. The decays of B+ mesons are reconstructed in approximately 2.8 fb-1 of data recorded by D0 detector in 2002-2007 during Run II of Fermilab Tevatron collider. Using the unbinned likelihood fit, a signal of 40,222 {+-} 242 of B+ → J/ΨK+ and 1,578 ± 119 of B+ → J/Ψπ+ events is obtained. The corresponding direct CP violation asymmetries are measured to be ACP(B+ → J/Ψ(1S)K+) = +0.0077 ± 0.0061(stat.) ± 0.0027(syst.), and ACP(B+ → J/Ψ(1S)π+) = - 0.089 ± 0.081(stat.) ± 0.028(syst.). The result on ACP (B+ → J/Ψ(1S)K+) is consistent with the 2007 world average and is the most precise measurement of this asymmetry, with uncertainty approaching the level of the Standard Model prediction. The result on ACP (B+ → J/Ψ(1S)π+) constitutes the first measurement of this asymmetry at the hadron collider, with uncertainty at the level of the 2007 world average. The measurement presented in this thesis has become possible due to the sophisticated online and offline tracking/vertexing implemented at D0, and the regular reversal of the polarities of the D0 detector magnets.

  12. Impact of quark flavor violation on the decay $h^0(125GeV) \\to c\\bar{c}$ in the MSSM

    CERN Document Server

    Hidaka, K; Eberl, H; Ginina, E; Majerotto, W

    2015-01-01

    We compute the decay width of $h^0 \\to c \\bar{c}$ in the MSSM with quark flavor violation (QFV) at full one-loop level in the $\\overline{\\rm DR}$ renormalization scheme. We study the effects of $\\tilde{c}-\\tilde{t}$ mixing, taking into account the constraints on QFV from the B meson data. We find that the full one-loop corrected decay width $\\Gamma(h^0 \\to c \\bar{c})$ is very sensitive to the MSSM QFV parameters. In a scenario with large $\\tilde{c}_{L,R}-\\tilde{t}_{L,R}$ mixing, $\\Gamma (h^0 \\to c \\bar{c})$ can differ up to $\\sim \\pm 35\\%$ from its SM value. After estimating the uncertainties of the width, we conclude that an observation of these QFV SUSY effects is possible at a future $e^+ e^-$ collider such as ILC.

  13. AMS using 14UD Pelletron at TIFR, Mumbai: present status and future prospects

    International Nuclear Information System (INIS)

    The AMS (Accelerator Mass Spectrometry) is a versatile tool employed in multidisciplinary programmes. The AMS programme at the BARC-TIFR 14UD Pelletron accelerator has been initiated with major emphasis on the determination of 36Cl concentration in environment in general and water samples in particular. Preliminary measurements related to detection of 129I have been carried out in recent past. The system used for AMS measurement is based on a 14 MV Tandem Accelerator. In this paper, the status and future prospects of AMS programme at BARC-TIFR Pelletron Accelerator Facility are presented

  14. Intrinsic charm content of the nucleon and charmness-nucleon sigma term

    CERN Document Server

    Duan, Shaorong; Saghai, B

    2016-01-01

    In the extended chiral constituent quark model, the intrinsic $c \\bar{c}$ content of the nucleon is investigated. The probabilities of the quark-antiquark components in the nucleon wave functions are calculated by taking the nucleon to be admixtures of three- and five-quark components, with the relevant transitions handled {\\it via} the $^{3}$P$_{0}$ mechanism. Predictions for the probability of the $c \\bar{c}$ in the nucleon wave function and the charmness-nucleon sigma term are presented. Our numerical results turn out to be consistent with the predictions from various other approaches reported in the literature.

  15. Successful test flight of an airship

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    @@ Researchers with the Balloon Aircraft Research Center (BARC) of the Academy of Opto-electronics, CAS, succeeded in their first test flight of an aeroboat with a flight altitude up to 1,000 meters and an effective payload of 20 kilograms in Shandong on 25 December, 2007.

  16. Heavy quark symmetry and weak decays of the $b$-baryons in pentaquarks with a $c\\bar{c}$ component

    CERN Document Server

    Ali, Ahmed; Aslam, M Jamil; Rehman, Abdur

    2016-01-01

    The discovery of the baryonic states $P_c^+(4380)$ and $P_c^+(4450)$ by the LHCb collaboration has evoked a lot of theoretical interest. These states have the minimal quark content $c \\bar{c} u u d$. Interpreted as hidden charm diquark-diquark-antiquark baryons, the assigned spin and angular momentum quantum numbers are $P_c^+(4380)= \\{\\bar{c} [cu]_{s=1} [ud]_{s=1}; L_{\\mathcal{P}}=0, J^{\\rm P}=\\frac{3}{2}^- \\}$ and $P_c^+(4450)= \\{\\bar{c} [cu]_{s=1} [ud]_{s=0}; L_{\\mathcal{P}}=1, J^{\\rm P}=\\frac{5}{2}^+ \\}$, where $s=0,1$ are the spins of the diquarks and $L_{\\mathcal{P}}=0,1$ are the orbital angular momentum quantum numbers of the pentaquarks. We point out that heavy quark symmetry allows only the higher mass pentaquark state $P_c^+(4450)$ having $[ud]_{s=0}$ to be produced in $\\Lambda_b^0$ decays, whereas the lower mass state $P_c^+(4380)$ having $[ud]_{s=1}$ is disfavored. Pentaquark spectrum is rich enough to accommodate a $J^P=\\frac{3}{2}^-$ state, which has the correct light diquark spin $\\{\\bar{c} [cu...

  17. CHARM PHYSICS PERFORMANCE STUDIES FOR PANDA

    NARCIS (Netherlands)

    Biegun, Aleksandra

    2011-01-01

    The study of the charmonium ((c) over barc) system is a powerful tool to understand the strong interaction. In (p) over barp annihilations studied with PANDA, the mass and width of the charmonium state, such as h(c), will be measured with an excellent accuracy, determined by the very precise knowled

  18. 7 CFR 502.9 - Soliciting, vending, debt collection, and distribution of handbills.

    Science.gov (United States)

    2010-01-01

    ... display or distribution of commercial advertising, or the collecting of private debts, in or on BARC... 7 Agriculture 6 2010-01-01 2010-01-01 false Soliciting, vending, debt collection, and distribution... PROPERTY, BELTSVILLE, MARYLAND § 502.9 Soliciting, vending, debt collection, and distribution of...

  19. Testing low cost anaerobic digestion (AD) systems

    Science.gov (United States)

    To evaluate the potential for low technology and low cost digesters for small dairies, BARC and researchers from the University of Maryland installed six modified Taiwanese-model field-scale (FS) digesters near the original dairy manure digester. The FS units receive the same post-separated liquid ...

  20. 7 CFR 502.4 - Conformity with signs and emergency directions.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 6 2010-01-01 2010-01-01 false Conformity with signs and emergency directions. 502.4 Section 502.4 Agriculture Regulations of the Department of Agriculture (Continued) AGRICULTURAL RESEARCH..., MARYLAND § 502.4 Conformity with signs and emergency directions. Persons in and on property of BARC...

  1. Radiation dosage

    International Nuclear Information System (INIS)

    Radiation dosage at Bikini Atoll is the result of current soil contamination, a relic of the nuclear weapons testing program of some 30 years ago. The principal contaminants today and some of their physical properties are listed: cesium-137, strontium-90, plutonium -239, 240 and americium-241. Cobalt-60 contributes less than 1 to the dose and is not considered significant. A resident of the atoll would accumulate radiation dose (rem) in two ways -- by exposure to radiation emanating from the ground and vegetation, and by exposure to radiation released in the spontaneous decay of radionuclides that have entered his body during the ingestion of locally grown foods. The latter process would account for some 90% of the dose; cesium-137 would be responsible for 0 90% of it. Since BARC's method of estimating dosage differs in some respects from that employed by the Lawrence Livermore National Laboratory (LLNL), (Ref.1, LLNL 1982) we are presenting our method in detail. The differences have two sources. First, the numbers used by BARC for the daily ingestion of radionuclides via the diet are higher than LLNL's. Second, BARC's calculation of dose from radionuclide intake utilizes the ICRP system. The net result is that BARC doses are consistently higher than LLNL doses, and in this respect are more conservative

  2. Tradeoff between bleeding and stent thrombosis in different dual antiplatelet therapy regimes

    DEFF Research Database (Denmark)

    Jeger, Raban V; Pfisterer, Matthias E; Sørensen, Rikke;

    2014-01-01

    BACKGROUND: The tradeoff between stent thrombosis (ST) and major bleeding (MB) of 12- versus 6-month dual antiplatelet therapy (DAPT) after coronary stent implantation has not been clearly defined. METHODS: Definite/probable ST and MB (TIMI major and Bleeding Academic Research Consortium (BARC) ≥ 3...

  3. Online Decision Support System (IRODOS) - an emergency preparedness tool for handling offsite nuclear emergency

    International Nuclear Information System (INIS)

    A real time online decision support system as a nuclear emergency response system for handling offsite nuclear emergency at the Nuclear Power Plants (NPPs) has been developed by Health, Safety and Environment Group, Bhabha Atomic Research Centre (BARC), Department of Atomic Energy (DAE) under the frame work of 'Indian Real time Online Decision Support System 'IRODOS'. (author)

  4. Advances in ultrafiltration membrane technology for water purification and effluent treatment

    International Nuclear Information System (INIS)

    This paper aims at presenting the advances made in ultrafiltration (UF) membrane separation technology with an emphasis on the potential areas of its applications and some of R and D works carried out in this direction in our laboratory in BARC. (author)

  5. Simulation results of liquid and plastic scintillator detectors for reactor antineutrino detection - A comparison

    International Nuclear Information System (INIS)

    A simulation study of two kinds of scintillation detectors has been done using GEANT4. We compare plastic scintillator and liquid scintillator based designs for detecting electron antineutrinos emitted from the core of reactors. The motivation for this study is to set up an experiment at the research reactor facility at BARC for very short baseline neutrino oscillation study and remote reactor monitoring

  6. Effector-Triggered Immunity Determines Host Genotype-Specific Incompatibility in Legume-Rhizobium Symbiosis.

    Science.gov (United States)

    Yasuda, Michiko; Miwa, Hiroki; Masuda, Sachiko; Takebayashi, Yumiko; Sakakibara, Hitoshi; Okazaki, Shin

    2016-08-01

    Symbiosis between legumes and rhizobia leads to the formation of N2-fixing root nodules. In soybean, several host genes, referred to as Rj genes, control nodulation. Soybean cultivars carrying the Rj4 gene restrict nodulation by specific rhizobia such as Bradyrhizobium elkanii We previously reported that the restriction of nodulation was caused by B. elkanii possessing a functional type III secretion system (T3SS), which is known for its delivery of virulence factors by pathogenic bacteria. In the present study, we investigated the molecular basis for the T3SS-dependent nodulation restriction in Rj4 soybean. Inoculation tests revealed that soybean cultivar BARC-2 (Rj4/Rj4) restricted nodulation by B. elkanii USDA61, whereas its nearly isogenic line BARC-3 (rj4/rj4) formed nitrogen-fixing nodules with the same strain. Root-hair curling and infection threads were not observed in the roots of BARC-2 inoculated with USDA61, indicating that Rj4 blocked B. elkanii infection in the early stages. Accumulation of H2O2 and salicylic acid (SA) was observed in the roots of BARC-2 inoculated with USDA61. Transcriptome analyses revealed that inoculation of USDA61, but not its T3SS mutant in BARC-2, induced defense-related genes, including those coding for hypersensitive-induced responsive protein, which act in effector-triggered immunity (ETI) in Arabidopsis. These findings suggest that B. elkanii T3SS triggers the SA-mediated ETI-type response in Rj4 soybean, which consequently blocks symbiotic interactions. This study revealed a common molecular mechanism underlying both plant-pathogen and plant-symbiont interactions, and suggests that establishment of a root nodule symbiosis requires the evasion or suppression of plant immune responses triggered by rhizobial effectors. PMID:27373538

  7. Report on R and D activities of Health Physics Division 1984 - 1985

    International Nuclear Information System (INIS)

    A summary of the research and development programmes undertaken in Health Physics Division during the period 1984-1985 is contained in the report. The details of the various investigations are given in references listed under each abstract, most of which are published in the form of papers in symposia and journals or as BARC reports. Some of the investigations have been carried out in collaboration with other Divisions of BARC and outside organisations. A list of these leading to M.Sc./Ph.D Degrees submitted by members of the Division is given at the end. The Division has also a number of research contracts with IAEA. A summary of work carried out under these projects is included in a separate section. (author)

  8. A deficit scaling algorithm for the minimum flow problem

    Indian Academy of Sciences (India)

    Laura Ciupală

    2006-06-01

    In this paper, we develop a new preflow algorithm for the minimum flow problem, called deficit scaling algorithm. This is a special implementation of the generic preflow algorithm for the minimum flow problem developed by Ciurea and Ciupală earlier. The bottleneck operation in the generic preflow algorithm is the number of noncancelling pulls. Using the scaling technique (i.e. selecting the active nodes with sufficiently large deficits), we reduce the number of noncancelling pulls to $O(n^2 \\log \\bar{c})$ and obtain an $O(nm+n^2 \\log \\bar{c})$ algorithm.

  9. Technology transfer from nuclear research

    International Nuclear Information System (INIS)

    A number of processes, components and instruments developed at the Bhabha Atomic Research Centre, (BARC), Bombay, find application in industry and are available for transfer to private or public sector undertakings for commercial exploitation. The Technology Transfer Group (TTG) constituted in January 1980 identifies such processes and prototypes which can be made available for transfer. This catalogue contains brief descriptions of such technologies and they are arranged under three groups, namely, Group A containing descriptions of technologies already transferred, Group B containing descriptions of technologies ready for transfer and Group C containing descriptions of technology transfer proposals being processed. The position in the above-mentioned groups is as on 1 March 1989. The BARC has also set up a Technology Corner where laboratory models and prototypes of instruments, equipment and components are displayed. These are described in the second part of the catalogue. (M.G.B.)

  10. Prototype development of filter monitor for 131I processing plant

    International Nuclear Information System (INIS)

    Iodine-131 (131I) is used extensively in nuclear medicine because of its short half-life and useful beta emission. Isotope Production and Applications Division (IP and AD) of BARC produces 131I in its processing plant. The charcoal filters that are capable of extracting high levels of radioactive iodine and particulates in the suction flow are installed in the plant. The radioactive iodine is fully removed and deposited onto activated charcoal impregnated with potassium iodide. These charcoal filters get saturated over a period of use and need to be replaced with fresh ones. A 5-channel Filter monitor for online measurement of radiation level of trapped 131I on the charcoal filter is being developed by IP and AD, BARC. The unavailability of this type of instrument motivated to undertake this development. Current paper deals with a prototype filter monitor developed with single detector. Some results prove the functionality of the system. (author)

  11. Research and development activities of the Seismology Section for the period January 1982-December 1983

    International Nuclear Information System (INIS)

    The research and development activities of the Seismology Section of the Bhabha Atomic Research Centre (BARC) at Bombay are reported for the period January 1982-December 1983 in the form of summaries. The Section's activities are mainly directed towards detection of underground nuclear explosions. During the report period 64 signals out of about 12000 seismograms which were examined were identified as the signals due to underground nuclear explosions. The instrumentation work for Kolar rockburst research was almost completed under the collaboration programme of BARC with Bharat Gold Mines Ltd. Analytical methods have been developed for interpreting the frequency-magnitude relation of earthquake. These methods will be useful in the seismic estimation of risk in case only restricted data involving events of low magnitude are available. A list of publications of the staff-members of the Section during the report period is given. (M.G.B.)

  12. Progress report [of] Technical Physics and Prototype Engineering Division, April 1982 - March 1984

    International Nuclear Information System (INIS)

    The work done by the Technical Physics and Prototype Engineering Division of the Bhabha Atomic Research Centre (BARC) at Bombay during the period from April 1982 to March 1984 is described in the form of summaries. The main thrust of the work of the Division is towards designing, developing, fabricating and if needed, producing on a large scale various instruments, equipment and components required for the programmes of the BARC and the Department of Atomic Energy. The summaries describing the work are grouped under the headings:(1) vacuum, (2) surface analysis, (3) mass spectrometry, (4) electronics, (5) cryogenics, (6) crystals and detectors, (7) glass technology and devices, and (8) optoelectronics. A list of publications of the staff-members of the Division during the report period is given. (M.G.B.)

  13. Parametric thermal analysis of 75 MHz heavy ion RFQ

    International Nuclear Information System (INIS)

    An ECR based Heavy Ion Accelerator comprising of a superconducting Electron Cyclotron Resonance (ECR) Ion Source, normal conducting RFQ (Radio Frequency Quadrupole) and superconducting Niobium resonators is being developed at BARC under XII plan. A state-of-the-art 18 GHz superconducting ECR ion source (PK-ISIS) jointly configured with Pantechnik, France is operational at Van-de-Graaff, BARC. The electromagnetic design of the improved version of 75 MHz heavy ion RFQ has been reported earlier. The previous thermal study of 51 cm RFQ model showed large temperature variation axially along the vane tip. A new coolant flow scheme has been worked out to optimize the axial temperature gradient. In this paper the thermal analysis including parametric study of coolant flow rates and inlet temperature variation will be presented. (author)

  14. Progress report of Technical Physics Division: April 1980 - March 1982

    International Nuclear Information System (INIS)

    Activities, with an individual summary of each, of the Technical Physics Division (TPD) of the Bhabha Atomic Research Centre (BARC), Bombay are reported for the period April 1980 - March 1982. The major thrust of the TPD's work has been in: (i) design and fabrication of instruments, devices and equipment and (ii) development of techniques in the frontline research and technology areas like vacuum science, surface analysis, cryogenics and crystal growing. The Division also provided custombuilt electronics equipment, vacuum systems and glass components and devices to the various Divisions of BARC and other units of the DAE. Training and manpower development activities and technology transfer activities are also reported. Lists of seminars, colloquia, publications during the period of the report are given. (M.G.B.)

  15. Design and development of an integrated Environmental Radiation Monitor - Automatic Weather Station (ERM-AWS)

    International Nuclear Information System (INIS)

    Online monitoring of atmospheric gamma radiation and meteorological parameters is an important and useful input for handling any radiation emergency. Radiological Safety Systems Division, Bhabha Atomic Research Centre has been developing wide variety of radiation detectors, with continuous improvements based on the advancement in technology and user's requirements. BARC and ISRO (Indian Space Research Organization) under a collaborative program designed and integrated Environmental Radiation Monitor (ERM, developed under IERMON program by BARC) with Automatic Weather Station (AWS, developed by ISRO), as a single stand-alone ERM-AWS system. The system operates with solar powered battery backup and the data transmission is via satellite. ERM-AWS units have been produced and installed at few DAE and non-DAE facilities. A dedicated stand-alone satellite Earth Station has also been established at CTCRS, Anushaktinagar, Mumbai, to receive the data transmitted from ERM-AWS system. (author)

  16. An indigenous system for in-service inspection of coolant channels of 235 MWe PHWRs

    International Nuclear Information System (INIS)

    In-service inspection of coolant channels of nuclear power plants is essential to provide information on ageing effects. A channel inspection system (BARCIS- BARC Channel Inspection System) for in-service inspection of coolant channels of 235 MWe PHWRs has been recently developed at BARC. The need for such a system was being felt for quite sometime. The system is designed with the aim to minimise radiation exposure to inspection personnel and to perform the inspection so as to minimise reactor downtime. Sixteen coolant channels of RAPS-2 and fourteen coolant channels of MAPS-2 have been inspected using BARCIS MARK-1 system. Details of the system developed and the results of inspection are presented. (author). 3 refs., 3 tabs., 5 figs

  17. Development of neutron detectors and neutron radiography at Bhabha Atomic Research Centre

    Indian Academy of Sciences (India)

    A M Shaikh

    2008-10-01

    Design and development of neutron detectors and R&D work in neutron radiography (NR) for non-destructive evaluation are important parts of the neutron beam and allied research programme of Solid State Physics Division (SSPD) of Bhabha Atomic Research Centre (BARC). The detectors fabricated in the division not only meet the in-house requirement of neutron spectrometers but also the need of other divisions in BARC, Department of Atomic Energy units and some universities and research institutes in India and abroad for a variety of applications. The NR facility set up by SSPD at Apsara reactor has been used for a variety of applications in nuclear, aerospace, defense and metallurgical industries. The work done in the development of neutron detectors and neutron radiography is reported in this article.

  18. Operating experience of upgraded radio frequency source at 76 MHz coupled to heavy ion RFQ

    International Nuclear Information System (INIS)

    A heavy ion radio frequency quadrupole (RFQ) accelerator has been developed at BARC (BARC). A RF source which was designed and developed at 76 MHz earlier, has been upgraded and coupled to heavy ion RFQ successfully. The DC bias supplies of this source have been replaced with new supplies having high efficiency and well filteration against RF interference (RFI). The driver of main power amplifier has been replaced with indigenously designed and developed unit. The earlier introduced microcontroller based interlock experienced RF noise issues. So, this circuit has been modified with the new circuit. With these modifications, the performance of the RF source was improved. Additionally, a separate low power RF source of around 100+ Watt was designed, developed and integrated with RFQ for its RF conditioning. This paper describes the details of up gradation of technologies implemented and coupling experience of this RF source with heavy ion RFQ. (author)

  19. Water Chemistry Section: progress report (1981-82)

    International Nuclear Information System (INIS)

    The activities of the Water Chemistry Section of the Bhabha Atomic Research Centre (BARC), Bombay, during the years 1981 and 1982 are reported in the form of individual summaries. The research activities of the Section cover the following areas: (1) chemistry and thermodynamics of nuclear materials, (2) crystal structure of organo-metallic complexes using X-ray diffraction, (3) thermophysical and phase transition studies, (4) solid state chemistry and thermochemical studies, (5) water and steam chemistry of heavy water plants and phwr type reactors, and (6) uranium isotope exchange studies. A survey is also given of: (i) the Section's participation in advisory and consultancy services in nuclear and thermal power stations, (ii) training activities, and (iii) assistance in chemical analysis by various techniques to other units of BARC and outside agencies. A list of publications and lectures by the staff during the report period is included. (M.G.B.)

  20. Silicon detector technology development in India for the participation in international experiments

    Indian Academy of Sciences (India)

    Anita Topkar; S Praveenkumar; Bharti Aggarwal; S K Kataria; M D Ghodgaonkar

    2007-12-01

    A specific research and development program has been carried out by BARC in India to develop the technology for large area silicon strip detectors for application in nuclear and high energy physics experiments. These strip detectors will be used as pre-shower detector in the CMS experiment at LHC, CERN for 0/ rejection. The fabrication technology to produce silicon strip detectors with very good uniformity over a large area of ∼ 40 cm2, low leakage currents of the order of 10 nA/cm2 per strip and high breakdown voltage of >500 V has been developed by BARC. The production of detectors is already under way to deliver 1000 detector modules for the CMS and 90% production is completed. In this paper, research and development work carried out to develop the detector fabrication technology is briefly described. The performance of the silicon strip detectors produced in India is presented. The present status of the detector technology is discussed.

  1. A low noise hybrid preamplifier for nuclear spectroscopy applications

    International Nuclear Information System (INIS)

    Full text: A low noise hybrid preamplifier has been designed and developed successfully in collaboration with BEL, Bangalore. These hybrids are commercially available from BEL, Bangalore with part name as 'BMC 1521'. The hybrids provide flexibility of selecting input JFET, feedback resistor and feedback capacitor, thus making it useful for a wide range of applications in nuclear instrumentation. BMC 1521 based preamplifier has been evaluated using Silicon PIN diode detectors developed by BARC- BEL collaboration and an energy resolution of 2.75 KeV for 60 Ke V gamma rays has been obtained. It is also being used with proportional counter based nuclear spectroscopy applications in BARC. The present paper reports development of the low noise hybrid preamplifier and demonstrates its excellent performance with Si PIN diode detectors

  2. Bhabha Atomic Research Centre : annual report 1990

    International Nuclear Information System (INIS)

    Research and development (R and D) activities of the Bhabha Atomic Research Centre (BARC) carried out during 1990 are reported. The main thrust of the R and D activities of BARC is on : (1)providing support to the nuclear power programme, (2)designing, building and utilising research reactors, (3)working in related frontline technologies, and also (4)basic research in frontier areas of science. These activities are described in brief under the chapters entitled : (1)Physical Sciences (2)Chemical Sciences (3)Materials and Material Science (4)Radioisotopes (5)Reactions (6)Fuel Cycle (7)Radiological Safety and Protection (8)Electronics and Instrumentation (9)Engineering Services (10)Life Sciences and (11)General. At the end of each chapter a list of papers and reports published in the subject field indicated by the title of the chapter is given. (N.B.). figs., tabs

  3. Lipids differentially degraded during tissue freezing and thawing

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    @@ Plants cope with freezing and thawing by altering the lipid composition of their cell membranes. Such cellular responses go through three phases Successful test flight of an airship Researchers with the Balloon Aircraft Research Center (BARC) of the Academy of Opto-electronics, CAS, succeeded in their first test flight of an aeroboat with a flight altitude up to 1,000 meters and an effective payload of 20 kilograms in Shandong on 25 December, 2007.

  4. Synthesis and luminescence properties of Tb$^{3+}-doped LiMgPO$_4$ phosphor

    Indian Academy of Sciences (India)

    C B PALAN; N S BAJAJ; A SONI; S K OMANWAR

    2016-09-01

    Polycrystalline sample LiMg$_{(1.x)}$PO$_4$:$x$Tb$^{3+}$ ($x = 0.001, 0.002, 0.005, 0.01, 0.02$) phosphor was synthesized via modified solid state method (MSSM). The prepared sample was characterized through XRD pattern (X-ray diffraction) and SEM (scanning electron microscope). Additionally, photoluminescence (PL), optically stimulated luminescence (OSL), thermoluminescence (TL) and other dosimetric properties including dose linearity, reusability and fading were studied. In OSL mode, sensitivity of prepared phosphor was found to be 2.7 times that of LiMgPO$_4$:Tb$^{3+}, B (BARC) phosphor and 4.3 times that of $\\alpha$-Al$_2$O$_3$:C (BARC) phosphor. The TL glow consists of overlapping peaks in temperature range of 50-400$^{\\circ}$C and first peak (P$_1$) was observed at 150$^{\\circ}$C, second peak (P$_2$) at 238$^{\\circ}$C, third peak (P$_3$) at 291$^{\\circ}$C and fourth peak (P$_4$) at 356$^{\\circ}$C. The TL sensitivity of second peak (P$_2$) of LiMgPO$_4$:Tb$^{3+}$ phosphor was compared with $\\alpha$-Al$_2$O$_3$:C (BARC) phosphor and found to be 100 times that of the $\\alpha$-Al$_2$O$_3$:C (BARC) phosphor. The minimum detectable dose (MDD) was found to be 5.6 $\\mu$Gy. Moreover, photoionization cross-sections, linearity, reusability, fading and kinetic parameters were calculated. Also, photoluminescence spectra of LiMgPO$_4$:Tb$^{3+}$ shows characteristic green.yellow emission exciting at 224nm UV source.

  5. Indian Experience In Commissioning, Operation and Safety of Wet Type Spent Fuel Storage Facilities

    International Nuclear Information System (INIS)

    The Indian Nuclear Power Programme is heavily based on PHWR. The spent fuels generated in Indian PHWRs are stored in water pools At Reactor and Fuel storage Facilities for interim periods before reprocessing. The technology of design, construction, commissioning and operation of these fuel storage facilities has been mastered by BARC. Some of the innovative features and operating experience of these facilities are described in this paper. (author)

  6. Physics study of D-D/D-T neutron driven experimental subcritical assembly

    International Nuclear Information System (INIS)

    An experimental program to design and study external source driven subcritical assembly has been initiated at BARC. This program is aimed at understanding neutronic characteristics of accelerator driven system at low power level. In this series, a zero-power, sub-critical assembly driven by a D-D/D-T neutron generator has been developed. This system is modular in design and it is first in the series of subcritical assemblies being designed

  7. Research and development activities of High Pressure Physics Division (October 1993 - March 1996)

    International Nuclear Information System (INIS)

    The research and development activities of the High Pressure Physics Division during the period October 1993-March 1996 are reported in the form of collection of papers presented in journals, conference proceedings and abstracts in conferences and Bhabha Atomic Research Centre (BARC) technical reports. The report is organised in two sections: (A) High Pressure Physics Division, and (B) Seismology Section. A list of staff members is enclosed at the end

  8. Scientometric dimensions of technical reports from Bhabha Atomic Research Centre

    OpenAIRE

    Swarna, T.; Kalyane, V. L.; Vijai Kumar, *

    2002-01-01

    Technical report is one of the media to record the scientific information generated by scientists and engineers, Bhabha Atomic Research Centre (BARC) published 554 technical reports during 1990-99 under the categories: External (373) and Internal (181), Engineering and technology generated 207 technical reports followed by chemistry, materials and earth sciences (129), while their interdisciplinary interactions resulted in 31 technical reports, Life and environmental sciences produced 42 tech...

  9. Scientometric Dimensions of Innovation Communication Productivity of the Chemistry Division at Bhabha Atomic Research Centre

    OpenAIRE

    Kademani, B. S.; Surwase, Ganesh; Anil Sagar, *; Lalit Mohan; Gaderao, C. R.; Anil Kumar; Kalyane, V. L.; Prakasan, E.R.; Vijai Kumar, *

    2005-01-01

    Scientrometric analysis of 1733 papers published by the teams comprising total of 926 participating scientists at Chemistry Division of Bhabha Atomic Research Centre (BARC) during 1970-1999 in the domains: Radiation & Photochemistry and Chemical Dynamics (649), Solid State Studies (558), Inorganic, Structural and Materials Chemistry (460) and Theoretical Chemistry (66) were analysed for yearwise productivity, authorship pattern and collaboration. The highest number of publicationsin a year we...

  10. Transient behaviour and coupling aspects of a hybrid MSF-RO nuclear desalination plant

    International Nuclear Information System (INIS)

    BARC is setting up a 6300 M3/day (1.4 MGD) hybrid MSF-RO nuclear desalination plant for sea water desalination at Madras Atomic Power Station (MAPS) coupled to a 170 MWe Pressurised Heavy Water Reactor (PHWR). The transient behaviour and coupling aspects of this dual purpose plant has been discussed. A hybrid desalination plant appears to offer high availability factor. (author)

  11. Effect of altrenogest and Lutalyse on parturition control, plasma progesterone, unconjugated estrogen and 13,14-dihydro-15-keto-prostaglandin F2 alpha in sows.

    Science.gov (United States)

    Guthrie, H D; Meckley, P E; Young, E P; Hartsock, T G

    1987-07-01

    To investigate control of parturition time, 154 sows farrowing 220 litters at three locations were treated with altrenogest and Lutalyse (PG). The four treatment groups were: 1) no treatment (control group); 2) an im injection of 15 mg of PG at 1000 on d 111, 112 or 113 of gestation (d 0 = first day of estrus and gestation); 3) altrenogest (20 mg X sow-1 X d-1) fed twice daily for 4 d starting on d 109, 110 or 111; and 4) altrenogest and an injection of PG at 1000 on the day after the last feeding of altrenogest. Control sows at the University of Delaware (UD), University of Maryland (UM) and USDA, Beltsville Agricultural Research Center (BARC) had mean gestation lengths of 113.5, 114.2 and 115.7 d and live pigs/litter were 10.5, 11.0 and 7.4, respectively. Altrenogest started by d 110 prevented unscheduled early farrowing and increased (P less than .01) gestation length by 1.7 and 1.1 d, respectively, at UD and UM, but had not effect at BARC. The time from PG to parturition was 24.3, 22.6 and 34.4 h, respectively, at UD, UM and BARC. More sows at UD and UM farrowed between 0700 and 1700 on the expected day of parturition after injection of PG (59.3%) than with no PG (20.7%; P less than .05). The high incidence of small litters (less than six pigs) from sows inseminated with frozen semen at BARC resulted in negative correlations of live pigs/litter with gestation length (r = -.533, P = .0001) and with time from PG injection to birth of first pig (r = -.425, P = .017); these correlations were not significant at UD and UM where only natural service was used.(ABSTRACT TRUNCATED AT 250 WORDS)

  12. Development of Electron Guns for Linacs and DC Accelerator

    International Nuclear Information System (INIS)

    Electrons guns for RF linacs and DC Accelerators are designed and developed at Electron Beam Centre (EBC)/APPD/BARC. Planar geometry grid and Pierce geometry grid configuration diode and triode guns with LaB6 cathode are developed. The cathode assembly consists of cups and heat shields made out of Tantalum and Rhenium sheets. The cathode assembly and the electron guns are tested on a test bench for beam characterization. The paper presents the development of the electron guns.

  13. Application of Handheld Tele-ECG for Health Care Delivery in Rural India

    OpenAIRE

    Meenu Singh; Amit Agarwal; Vineet Sinha; Rohit Manoj Kumar; Nishant Jaiswal; Ishita Jindal; Pankaj Pant; Munish Kumar

    2014-01-01

    Telemonitoring is a medical practice that involves remotely monitoring patients who are not at the same location as the health care provider. The purpose of our study was to use handheld tele-electrocardiogram (ECG) developed by Bhabha Atomic Research Center (BARC) to identify heart conditions in the rural underserved population where the doctor-patient ratio is low and access to health care is difficult. The objective of our study was clinical validation of handheld tele-ECG as a screening t...

  14. Food irradiation process control and acceptance. Regional UNDP project for Asia and the Pacific, mission undertaken in India. Food irradiation pilot scale studies and market testing RPFI-Phase 3

    International Nuclear Information System (INIS)

    A brief three-day visit to the Bhabha Atomic Research Center, Bombay, was made en-route to Thailand in mid-May. In addition to visits with professional staff of various BARC units plus the Isomed gamma radiation processing plant, a meeting was held with, and a seminar provided to representatives of interested private sector firms at State Trading Corporation Headquarters, and a videotape interview on food irradiation was made for inclusion in an educational videotape on the subject. (author)

  15. Feasibility of Natore Rubber Dam on Mahanonda River in Bangladesh and its Performance on Irrigation

    OpenAIRE

    Md. Sazadul Hasan; Md. Imran Kabir

    2016-01-01

    Low rainfall in winter causes a great problem on irrigation. Bangladesh Agricultural Research Council (BARC) started research on this problem from 1974. In 1994-95, Rubber Dam projects have been taken by BIC (Beijing IWHR Corporation) in Bangladesh as it is very convenience and effective in both irrigation and cultivation of crops in winter. After installing, it is very important and challenging task to study the suitability and effect of Rubber Dam on agriculture. In this research work, t...

  16. Report on R and D activities of Health Physics Division: 1988-1989

    International Nuclear Information System (INIS)

    The report summarises the different aspects of R and D programmes carried out in the Health Physics Division, BARC during 1988 and 1989. The results of various types of investigations on radiation physics, radiation dosimetry, instrumentation and techniques, environmental studies, micrometeorology etc. are presented in the form of abstracts. References to the detailed studies covered in the abstracts are also given in the appropriate sections. (author)

  17. Policies and public opinion towards immigrants: the Spanish case

    OpenAIRE

    Zapata, Ricard

    2009-01-01

    Abstract By tackling negative opinions towards immigration we can create a basis to orientate policies that seek to reduce them. My purpose is to highlight that the analysis of immigration in Spain exemplifies a clear link between policies and public opinion. It is this link that is at the basis of what I will call the ambivalence of Spanish public opinion, when border and integration issues are compared. (Zapata, Ricard) Universitat Pompeu Fabra - Barc...

  18. Routine clinical utility of aerosol lung scan (ALS) in patients being evaluated for pulmonary embolism (PE)

    International Nuclear Information System (INIS)

    99mTc-DTPA/MDA aerosol lung scan (ALS) (using BARC apparatus), 99mTc-MAA lung perfusion scan and chest radiography are routinely performed during the same visit in patients referred with the clinical suspicion of pulmonary embolism (PE). It is concluded that ALS is an excellent for diagnostic interpretation of PE as compared with chest radiography in significant number of patients

  19. BARCO公司在京设立产品展示室

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    @@ 日前,世界著名的投影机、显示器生产厂家BARC0公司与北京意韵电子公司合作设立了BARCO家庭影院展示中心,以典型的家庭环境为蓝本,集中展示了BARCO的Cine系列CRT投影机.

  20. High peak power Nd:glass lasers for fusion research

    International Nuclear Information System (INIS)

    This paper briefly reviews the basics of fusion and some of the major problems associated with building a 4 arms 1 kJ, 1 ns Nd:glass laser chain currently under development at the Bhabha Atomic Research Centre(BARC), Bombay. With this laser, it is proposed to study the various laser plasma interaction processes and to obtain compression of glass micro balloon targets filled with DT gas. (author). 15 refs., 8 figs., 3 tabs

  1. Development of NTD Ge Sensors for Superconducting Bolometer

    Science.gov (United States)

    Garai, A.; Mathimalar, S.; Singh, V.; Dokania, N.; Nanal, V.; Pillay, R. G.; Ramakrishnan, S.; Shrivastava, A.; Jagadeesan, K. C.; Thakare, S. V.

    2016-08-01

    Neutron transmutation-doped (NTD) Ge sensors have been prepared by irradiating device-grade Ge with thermal neutrons at Dhruva reactor, BARC, Mumbai. These sensors are intended to be used for the study of neutrinoless double beta decay in ^{124}Sn with a superconducting Tin bolometer. Resistance measurements are performed on NTD Ge sensors in the temperature range 100-350 mK. The observed temperature dependence is found to be consistent with the variable-range hopping mechanism.

  2. Beryllium facilities in India

    International Nuclear Information System (INIS)

    Due to its unique combination of physical, mechanical, thermal and nuclear properties, beryllium is indispensable for many applications in the fields of nuclear and space sciences. Beryllia and copper beryllium alloys have also found extensive applications in the electrical and electronic industries. Beryllium facilities at Bhabha Atomic Research Centre (BARC) have been set up to meet indigenous requirements for these materials. Besides developing beryllium technology, the project team has also designed and developed a number of special purpose equipment. (Author)

  3. Environmental gamma radiation levels around various DAE research centres

    International Nuclear Information System (INIS)

    This paper presents the gamma radiation levels of four research centres viz. Bhabha Atomic Research Centre (BARC), Trombay; Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam; Variable Energy Cyclotron Centre (VECC), Kolkata; Raja Ramanna Centre for Advanced Technology (RRCAT), Indore; and an industry Board of Radiation and Isotope Technology (BRIT), Vashi. BARC is India's premier nuclear research facility and is a multi-disciplinary research centre with extensive infrastructure for advanced research and development (R and D). IGCAR, Kalpakkam is engaged in scientific research and advanced engineering programme towards the development of Fast Breeder Reactor technology. VECC Kolkata is dedicated to carry out frontier R and D in the fields of Accelerator Science and Technology, Nuclear Science (Theoretical and Experimental), and Material Science etc. RRCAT, Indore has rapidly grown into a premier institute for R and D in lasers, accelerators and their applications. BRIT, Vashi unit is involved in production, development, and supply of radioisotope based products and provision of isotope applications, radiation processing, radio analytical services etc. With an objective to keep a watch on the prevailing environmental background gamma radiation level around all the DAE installations, routine monitoring programme are being carried out using the Thermo Luminescent Dosimeters (TLDs). TLDs provide the simple, inexpensive and precise measurement of small, integrated, external gamma radiation dose rate. The general practice of this programme is to observe the outdoor gamma radiation levels. This paper summarizes the methodology and gamma radiation levels of four research centres viz. BARC, IGCAR, VECC, RRCAT and an industry BRIT, Vashi

  4. Permeation of gases through electron-beam-irradiated polymer films

    International Nuclear Information System (INIS)

    The permeation of CO2, CH4, O2, N2, SF6, and He was measured at 35deg C in electron-beam-irradiated polymer films such as 1,2-polybutadiene (PB), polycarbonate (PC), polydimethylsiloxane (PDMS), poly(ethylene terephthalate) (PET), poly(4-methylpentene-1) (PMP), and polypropylene (PP). The permeability coefficients of the gases in PB decreased and those in PP increased with increasing irradiation dose, while those of PC, PDMS, PET, and PMP were virtually unaffected by irradiation. These results were attributed to the radiation effects of crosslinking in PB and degradation in PP. PC, PDM, PET, and PMP were insensitive to radiation, which accounts for the little change in permeation behavior. The decreases in permeability coefficients of the gases in irradiated PB films were attributed to changes in diffusivity, while solubility was not greatly affected. The dependence of permeability coefficients on crosslinking density of the irradiated PB films was also discussed. Decreases in permeability and diffusion coefficients were interpreted as due to decrease of free-volume content by crosslinking. The diffusion coefficient showed an approximately exponential relationship to the reciprocal of the average molecular weight between crosslinks (M-barc) over a range of M-barc between 200 and 20000. This suggests that the free-volume of the crosslinked polymer may be proportional to M-barc. (author)

  5. Status of $\\psi$ (3686), $\\psi$ (4040), $\\psi$ (4160), Y (4260), $\\psi $ (4415) and X (4630) charmonia like states

    CERN Document Server

    Shah, Manan; Parmar, Arpit; Vinodkumar, P C

    2013-01-01

    We examine the status of charmonia like states by looking into the behaviour of the energy level differences and regularity in the behaviour of the leptonic decay widths of the excited charmonia states. The spectroscopic states are studied using a phenomenological Martin-like confinement potential and their radial wave functions are employed to compute the di-leptonic decay widths. Their deviations from the expected behaviour provide a clue to consider them as admixtures of the nearby S and D states. The present analysis strongly favour \\$$\\backslash$psi \\$ (3686) as admixture of $c \\bar{c}$ (2S) and $c \\bar{c}$g (4.1 GeV) hybrid, \\$$\\backslash$psi \\$ (4040) and \\$$\\backslash$psi \\$ (4160) as admixture states of charmonia (3S, 3D) states with mixing angle \\$$\\backslash$theta \\$ = 11$^\\circ$ and 45$^\\circ$ respectively. We identify Y (4260) as a pure $c \\bar{c}$ (4S) state whose leptonic decay is predicted as 0.65 keV. While X(4630) is closer to the $c \\bar{c}$ (6S) state. The status of \\$$\\backslash$psi \\$ (4...

  6. Photoproduction of hidden-charm states in $\\gamma p \\to \\bar{D}^{*0} \\Lambda^+_c$ reaction near threshold

    CERN Document Server

    Huang, Yin; He, Jun; Chen, Xurong; Zhang, Hong-Fei

    2016-01-01

    We report on a theoretical study of the hidden charm $N^*_{c \\bar{c}}$ states in the $\\gamma p \\to \\bar{D}^{*0} \\Lambda^+_c$ reaction near threshold within an effective Lagrangian approach. In addition to the contributions from the $s$-channel nucleon pole, the $t$-channel $D^0$ exchange, the $u$-channel $\\Lambda^+_c$ exchange and the contact term, we study the contributions from the $N^*_{c \\bar{c}}$ states with spin-parity $J^P = 1/2^-$ and $3/2^-$. The total and differential cross sections of the $\\gamma p \\to \\bar{D}^{*0} \\Lambda^+_c$ reaction are predicted. It is found that the contributions of these $N^*_{c \\bar{c}}$ states give clear peak structures in the total cross sections. Thus, this reaction is another new platform to study the hidden-charm states. It is expected that our model calculation may be tested by the future experiments.

  7. Advancements in organic antireflective coatings for dual-damascene processes

    Science.gov (United States)

    Deshpande, Shreeram V.; Shao, Xie; Lamb, James E., III; Brakensiek, Nickolas L.; Johnson, Joe; Wu, Xiaoming; Xu, Gu; Simmons, William J.

    2000-06-01

    Dual Damascene (DD) process has been implemented in manufacturing semiconductor devices with smaller feature sizes (EQ 0.20 micrometer), due to increased use of copper as a metal of choice for interconnects. Copper is preferred over aluminum due to its lower resistance which helps to minimize the effects of interconnect delays. Via first DD process is the most commonly used process for manufacturing semiconductor devices since it requires less number of processing steps and also it can make use of a via fill material to minimize the resist thickness variations in the trench patterning photolithography step. Absence of via fill material results in non-uniform fill of vias (in isolated and dense via regions) thus leading to non-uniform focus and dose for exposure of the resist in the deep vias. This results in poor resolution and poor critical dimension (CD) control in the trench-patterning step. When a via fill organic material such as a bottom anti- reflective coating (BARC) is used, then the resist thickness variations are minimized thus enhancing the resolution and CD control in trench patterning. Via fill organic BARC materials can also act as etch blocks at the base of the via to protect the substrate from over etch. In this paper we review the important role of via fill organic BARCs in improving the efficiency of via first DD process now being implemented in semiconductor manufacturing.

  8. Bhabha Atomic Research Centre annual report : 1989

    International Nuclear Information System (INIS)

    The main thrust of the various research and development (R and D) activities of the Bhabha Atomic Research Centre (BARC), Bombay, is towards the implementation of India's nuclear power programme. To that end, its R and D activities cover the entire nuclear fuel cycle, reactor technology; applications of radioisotopes and radiations in agriculture, medicine and industries; and radiation protection in nuclear installations. The report presents in summarised form the R and D activities carried out during 1989 in the chapters entitled: Physical Sciences, Chemical Sciences, Materials and Materials Sciences, Radioisotopes, Reactors, Fuel Cycle, Radiological Safety and Protection, Electronics and Instrumentation, Engineering Services, Life Sciences and General. At the end of each chapter, a list of publications by the staff scientists in the corresponding subject field is given. The list includes published journal articles and technical reports, and papers presented at conferences, symposia etc. The report also covers the R and D activities of the outstation units of BARC, namely, Nuclear Research Laboratory, Srinagar; High Altitude Research Laboratory, Gulmarg; and Variable Energy Cyclotron Centre, Calcutta. BARC is also engaged in basic an applied research in frontier areas of science such as plasma and fusion physics, accelerators and lasers, high temperature superconductivity, condensed matter physics, high pressure physics, high resolution spectroscopy, chemical reaction dynamics and laser induced chemistry, electronics and robotics: radiation biology, and genetic engineering. Report is illustrated with a number of figures, graphs, and coloured pictures. (M.G.B.) figs., refs

  9. Progress report: 1996 Radiation Safety Systems Division

    International Nuclear Information System (INIS)

    The activities of Radiation Safety Systems Division include (i) development of specialised monitoring systems and radiation safety information network, (ii) radiation hazards control at the nuclear fuel cycle facilities, the radioisotope programmes at Bhabha Atomic Research Centre (BARC) and for the accelerators programme at BARC and Centre for Advanced Technology (CAT), Indore. The systems on which development and upgradation work was carried out during the year included aerial gamma spectrometer, automated environment monitor using railway network, radioisotope package monitor and air monitors for tritium and alpha active aerosols. Other R and D efforts at the division included assessment of risk for radiation exposures and evaluation of ICRP 60 recommendations in the Indian context, shielding evaluation and dosimetry for the new upcoming accelerator facilities and solid state nuclear track detector techniques for neutron measurements. The expertise of the divisional members was provided for 36 safety committees of BARC and Atomic Energy Regulatory Board (AERB). Twenty three publications were brought out during the year 1996. (author)

  10. Enhanced power generation in concentrated photovoltaics using broadband antireflective coverglasses with moth eye structures.

    Science.gov (United States)

    Song, Young Min; Jeong, Yonkil; Yeo, Chan Il; Lee, Yong Tak

    2012-11-01

    We present the effect of broadband antireflective coverglasses (BARCs) with moth eye structures on the power generation capability of a sub-receiver module for concentrated photovoltaics. The period and height of the moth eye structures were designed by a rigorous coupled-wave analysis method in order to cover the full solar spectral ranges without transmission band shrinkage. The BARCs with moth eye structures were prepared by the dry etching of silver (Ag) nanomasks, and the fabricated moth eye structures on coverglass showed strongly enhanced transmittance compared to the bare glass with a flat surface, at wavelengths of 300 - 1800 nm. The BARCs were mounted on InGaP/GaAs/Ge triple-junction solar cells and the power conversion efficiency of this sub-receiver module reached 42.16% for 196 suns, which is a 7.41% boosted value compared to that of a module with bare coverglass, without any detrimental changes of the open circuit voltages (V(oc)) and fill factor (FF). PMID:23326839

  11. Bhabha Atomic Research Centre: annual report 1986-87

    International Nuclear Information System (INIS)

    The Research and Development (R and D) work and achievements of the Bhabha Atomic Research Centre, Bombay, during the financial year 1986-1987 are reported. The R and D activities of BARC cover the entire nuclear fuel cycle, production and use of radioisotopes, radiation protection and also basic research in several disciplines. The report is presented in the chapters entitled: Physical Sciences, Chemical Sciences, Materials and Materials Science, Life Sciences, Radioisotopes, Reactors, Fuel Cycle, Health and Safety, Electronics and Instrumentation, Engineering and General Services. At the end of each chapter are listed the journal articles published, the paper presented at conferences, symposia etc. and technical reports issued by the scientists of BARC in the subject field indicated by the title of the chapter. The R and D work of the outstation units of BARC, namely, Nuclear Research Laboratory at Srinagar, High Altitute Research Laboratory at Gulmarg, Variable Energy Cyclotron Centre at Calcutta and Gauribidanur Seismic Array near Bangalore are also described in the report. The report concludes with a brief account of: (1) transfer of technologies developed at the Centre, (2) activities related to human resource development for nuclear programmes of the country, and (3) progress of design and construction work of Centre for Advanced Technology at Indore. (M.G.B.)

  12. Inelastic J/psi electroproduction in e-p collisions

    CERN Document Server

    Balbi, P

    2002-01-01

    Following HERA experiments our interest is focused, in the present paper, on charmonium production in lepton-proton collisions. Inelastic J/\\psi electroproduction is quite difficult to be measured due to the low rates of events; almost all experimental studies are indeed performed in photoproduction regime. J/\\psi resonance is considered as the product of the hadronization of a c \\bar{c} pair generated via boson-gluon fusion. The leading order contribution to the differential cross section, with respect to virtual photon-proton center of mass energy W and transferred four-momentum squared Q^2, is written as the sum of two terms related to a colour singlet and a colour octet c \\bar{c} pair production respectively. This expression contains two-gluons contributions and depends on three parameters; two of them are related to the hadronization fractions in charmonium states for the c \\bar{c} pair (colour singlet and colour octet), while the third parameter takes into accout possible ``hot-spot'' effects. The value...

  13. X-ray imaging for non-destructive testing of internal disorders in fruits

    International Nuclear Information System (INIS)

    A physiological disorder known as spongy tissue involving damage of the mesocarp (flesh) affects 20 to 30 percent of mango fruits, particularly Alphonso, the leading commercial variety of India. Large sized fruits and those more advanced in maturity or harvested when ripe show increased incidence of spongy tissue. The mango processing industry is also facing quality control problems and economic loss as weevil-infested fruits can contaminate the processed pulp as well as the processing machinery with insect, fecal and feed remnants. Studies undertaken in the Food Technology Division, Bhabha Atomic Research Centre (BARC), Mumbai with assistance from Radiation Standards Section, Radiological Unit, BARC Hospital and ECIL, Hyderabad, have shown that both spongy tissue affected and seed weevil infested mango fruits can be detected by x-ray transmittance. The resulting image can be used to detect affected fruits. An automated system for detecting and rejecting mangoes with spongy tissue or seed weevil infestation is under development in collaboration with the Electronic Systems Division, BARC. (author)

  14. Indian experience in neutron beam utilization: Inhouse and collaborative programs

    International Nuclear Information System (INIS)

    Neutron beam research, initiated in India during the late fifties, has evolved into the present National Facility for Neutron Beam Research (NFNBR), operated at Bhabha Atomic Research Centre (BARC), Mumbai, by scientists of Solid State Physics Division (SSPD). Dhruva, a 100 MW, natural uranium fuelled, heavy water moderated, and heavy water cooled research reactor, is the main source of neutrons, with a flux of about 1.8x1014 neutrons/cm2/s, for NFNBR. A four-circle single-crystal diffractometer, two powder diffractometers, a high-Q diffractometer, a polarization analysis spectrometer, a triple-axis spectrometer, a filter detector spectrometer, and a quasi-elastic scattering spectrometer are located inside Dhruva reactor hall, while two small-angle neutron scattering instruments are operational in the adjacent Guide-Tube Laboratory (GTL). A polarized neutron reflectometer has recently become operational, and a spin-echo spectrometer is under installation. Two neutron guide tubes, G1 and G2 (length: 21m and 35m, radius of curvature: 1916m and 3452m, characteristic wavelength: 3.0A and 2.2A respectively) transport neutron beams to GTL from the reactor hall. Average flux at the breaks, provided on the guides to accommodate various instruments, is about 107 neutrons/cm2/s. A neutron interferometer, originally installed at CIRUS reactor, is being upgraded, and plans to build a prompt gamma-ray neutron activation analysis facility, in collaboration with Radio Chemistry Division (RCD), are currently underway. Apsara reactor houses the neutron radiography and detector development facilities. Neutron detectors are developed and fabricated by NFNBR, for both in-house use, and supply to other users in the country. Linear position-sensitive detectors, using helium-3, have been developed and extensively used at BARC during the past decade. A two dimensional position-sensitive detector has also been fabricated and tested recently. All the neutron instruments, guide tubes

  15. Medical physics aspects of ophthalmic brachytherapy

    International Nuclear Information System (INIS)

    Intraocular melanoma is the most common primary malignancy of the eye. Radiation therapy using ophthalmic plaque has proved successful in the management of various ocular lesions. Although a few centres were using 90Sr/90Y plaques for shallow turtlours some years ago, eye plaque therapy was not a common practice in India. A revived interest in the use of eye plaque therapy and very high cost of imported sources has led to the development and production of 125I seed sources by the Radiopharmaceuticals Division, BARC. This report presents a brief description on the clinical, dosimetry and radiation safety aspects of 90Sr/90Y and 106Ru/106Rh beta ray and 125I gamma ray eye plaque applicators. This report has been divided in five Sections. Section I presents general introduction of ophthalmic brachytherapy including the structure of a human eye, types of ophthalmic plaques and characteristics of radioisotopes commonly used in such applications. A brief review of sources, applicators and dosimetry of 90Sr/90Y and 106Ru/106Rh beta and 125I gamma ophthalmic plaques are given in Section II and Section III, respectively. Section IV contains the single seed dosimetry data of BARC OcuProsta 125I seed as well as dosimetry data of typical eye plaques loaded with BARC OcuProsta 125I seed. Quality assurance and radiation safety aspects of these eye applicators are described in Section V. A proforma of the application required to be filled in by the user institution for obtaining regulatory consent to start eye plaque therapy has also been appended to this report. (author)

  16. Split-Hopkinson Pressure Bar: an experimental technique for high strain rate tests

    International Nuclear Information System (INIS)

    Mechanical properties of materials are, in general, strain rate dependent, i.e. they respond differently at quasi-static and higher strain rate condition. The Split-Hopkinson Pressure Bar (SHPB), also referred to as Kolsky bar is a commonly used setup for high strain rate testing. SHPB is suitable for high strain rate test in strain rate range of 102 to 104 s-1. These high strain rate data are required for safety and structural integrity assessment of structures subjected to dynamic loading. As high strain rate data are not easily available in open literature need was felt for setting up such high strain rate testing machine. SHPB at BARC was designed and set-up inhouse jointly by Refuelling Technology Division and Mechanical Metallurgy Division, at Hall no. 3, BARC. A number of conceptual designs for SHPB were thought of and the optimized design was worked out. The challenges of precision tolerance, straightness in bars and design and proper functioning of pneumatic gun were met. This setup has been used extensively to study the high strain rate material behavior. This report introduces the SHPB in general and the setup at BARC in particular. The history of development of SHPB, the basic formulations of one dimensional wave propagation, the relations between the wave velocity, particle velocity and elastic strain in a one dimensional bar, and the equations used to obtain the final stress vs. strain curves are described. The calibration of the present setup, the pre-test calculations and the posttest analysis of data are described. Finally some of the experimental results on different materials such as Cu, SS305, SA516 and Zr, at room temperature and elevated temperatures are presented. (author)

  17. Bhabha Atomic Research Centre: annual report 1988

    International Nuclear Information System (INIS)

    The research and development (R and D) work carried out in the Bhabha Atomic Research Centre (BARC), Bombay during 1988 is summarised and presented in the sections entitled Physical Sciences, Chemical Sciences, Materials and Materials Science, Radioisotopes, Reactors, Fuel cycle, Radiological Safety and Protection, Electronics and Instrumentation, Engineering Services, Life Sciences and General. At the end of each section a list of publications is also given. The R and D work of the outstation units of BARC, namely, Nuclear Research Laboratory, Srinagar; High Altitute Research Laboratory, Gulmarg and Variable Energy Cyclotron Centre, Calcutta are also described in this report. Some of the highlights of the work during the year are: (1) Medium Energy Heavy Ion Accelerator (MEHIA) facility set up jointly by BARC and the Tata Institute of Fundamental Research (TIFR) at TIFR premises became fully operational in September 1988. A number of new compositions of high temperature supconducting materials were synthesized. The highest transition temperature achieved was 125 K. Research work to improve the quality of sintered uranium oxide pellets achieved the purpose. Nuclear fuels were fabricated by using sol-gel process. R and D work for 235 MWe and 500 MWe PHWR type reactors is continuing. Conceptual design of the fuel handling system for the prototype fast breeder reactor was finalised. 233U+Al alloy fuel for Kamini reactor was fabricated. Progress has been made in industrial applications of enzymes. Various applications of radioisotopes are being continued. Certain technologies and processes developed in the Centre were transferred to commercial agencies for large scale exploitation. (M.G.B.)

  18. Puzzles of J/{Psi} production off nuclei

    Energy Technology Data Exchange (ETDEWEB)

    Kopeliovich, B.Z., E-mail: boris.kopeliovich@mpi-hd.mpg.d [Departamento de Fisica, Universidad Tecnica Federico Santa Maria, and Instituto de Estudios Avanzados en Ciencias e Ingenieria, and Centro Cientifico-Tecnologico de Valparaiso, Casilla 110-V, Valparaiso (Chile)

    2011-03-15

    Nuclear effects for J/{Psi} production in pA collisions are controlled by the coherence and color transparency effects. Color transparency onsets when the time of formation of the charmonium wave function becomes longer than the inter-nucleon spacing. In this energy regime the effective break-up cross section for a c-barc dipole depends on energy and nuclear path length, and agrees well with data from fixed target experiments, both in magnitude and energy dependence. At higher energies of RHIC and LHC coherence in c-barc pair production leads to charm quark shadowing which is a complement to the high twist break up cross section. These two effects explain well with no adjusted parameters the magnitude and rapidity dependence of nuclear suppression of J/{Psi} observed at RHIC in dAu collisions, while the contribution of leading twist gluon shadowing is found to be vanishingly small. A novel mechanism of double color filtering for c-barc dipoles makes nuclei significantly more transparent in AA compared to pA collisions. This is one of the mechanisms which make impossible a model independent 'data driven' extrapolation from pA to AA. This effect also explains the enhancement of nuclear suppression observed at forward rapidities in AA collisions at RHIC, what hardly can be related to the produced dense medium. J/{Psi} is found to be a clean and sensitive tool measuring the transport coefficient characterizing the dense matter created in AA collisions. RHIC data for p{sub T} dependence of J/{Psi} production in nuclear collisions are well explained with the low value of the transport coefficient q-hat{sub 0}<0.5 GeV{sup 2}/fm.

  19. Mutation breeding in oilseeds and grain legumes in India: Accomplishments and socio-economic impact

    International Nuclear Information System (INIS)

    In India, oilseed and grain legume crops are important food components as they are major contributors for dietary oils and proteins. In order to generate genetic variability in these crops, mutation research using X-rays, gamma rays, fast and thermal neutrons is extensively carried out in several national institutes, state agricultural universities including Bhabha Atomic Research Centre (BARC), Mumbai since half a century. Besides cytogenetic studies, the era of direct mutants as crop varieties began in groundnut, mustard, pigeonpea and mungbean. Induction of modified traits and their incorporation in an ideal genotype was achieved by judicious use of induced mutation and hybridization techniques. So far about 100 mutant varieties in oilseeds and legumes have been released in India. Of these, BARC has developed 33 varieties by incorporating desirable traits like large seed, semi dwarf habit, high harvest index, better partitioning, fresh seed dormancy, yellow seed colour, drought tolerance, powdery mildew resistance, yellow mosaic virus resistance, bacterial pustule resistance. Many of the breeding programmes in national/state systems have been utilizing BARC varieties as parental materials/donors and developed several improved varieties. Several of these varieties have high patronage from the farming community and extensively grown in the country. Groundnut varieties have made considerable impact by giving record yields across the country. Further, mungbean varieties were also surging ahead by virtue of their resistance to yellow mosaic virus, Rhizoctonia root-rot and powdery mildew diseases with suitability to rice fallow situations. Blackgram variety TAU-1 has occupied maximum blackgram area in Maharashtra state. These crop varieties also facilitated farmers to develop newer cropping systems. Mutant varieties like Aruna of castor, Pusa 408 (Ajay), Pusa-413 (Atul), Pusa-417 (Girnar) of chickpea, Co-4, Maru Moth-1 of mothbean are among the important varieties of

  20. Radiological safety experience in nuclear fuel cycle operations at Bhabha Atomic Research Center, Trombay, Mumbai, India

    International Nuclear Information System (INIS)

    Activities at Bhabha Atomic Research Centre (BARC), Mumbai, cover nuclear fuel cycle operations based on natural uranium as the fuel. The facilities include: plant for purification and production of nuclear grade uranium metal, fuel fabrication, research reactor operation, fuel reprocessing and radioactive waste management in each stage. Comprehensive radiation protection programmes for assessment and monitoring of radiological impact of these operations, both in occupational and public environment, have been operating in BARC since beginning. These programmes, based on the 1990 ICRP Recommendations as prescribed by national regulatory body, the Atomic Energy Regulatory Board (AERB), are being successfully implemented by the Health, Safety and Environment Group, BARC. Radiation Hazards Control Units attached to the nuclear fuel cycle facilities provide radiation safety surveillance to the various operations. The radiation monitoring programme consists of measurement and control of external exposures by thermoluminescent dosimeters (TLDs), hand-held and installed instruments, and internal exposures by bioassay and direct whole body counting using shadow shield counter for beta gamma emitters and phoswich detector based system for plutonium. In addition, an environmental monitoring programme is in place to assess public exposures resulting from the operation of these facilities. The programme involves analysis of various matrices in the environment such as bay water, salt, fish, sediment and computation of resulting public exposures. Based on the operating experience in these plants, improved educating and training programmes for plant operators, have been designed. This, together with the application of new technologies have brought down individual as well as average doses of occupational workers. The environmental releases remain a small fraction of the authorised limits. The operating health physics experience in some of these facilities is discussed in this paper

  1. Design and development of an ultrasonic pulser-receiver unit for non-destructive testing of materials

    International Nuclear Information System (INIS)

    The pulser/receiver constitutes the most vital part of an ultrasonic flaw detector or an ultrasonic imaging system used for inspection of materials. The ultrasonic properties of the material and resolution requirements govern the choice of the frequency of ultrasound that can be optimally used. The pulser/receiver in turn decides the efficiency of excitation of the transducer and the overall signal to noise ratio of the system for best sensitivity and resolution. A variety of pulsers are used in the ultrasonic instruments employed for materials inspection. This report describes a square wave type of an ultrasonic pulser-receiver unit developed at Ultrasonic Instrumentation Section, Electronics Division, BARC. It has been primarily designed for excitation of the transducer that is used with a multi-channel ultrasonic imaging system ULTIMA 100M targeted for inspection of SS403 billets, which are in turn used as the base material for fabrication of end fittings for coolant channels of pressurized heavy water nuclear reactors (PHWRs). The design of the pulser is based upon very fast MOSFETs, configured as electronic switches. The pulser is operated with a linear bipolar H.V. supply (+/- 500V max.). The receiver provides a 60 dB gain with a -3 dB BW of 40 MHz. This pulser/receiver unit has been successfully interfaced with a 4 channel ULTIMA 100 M4 multichannel ultrasonic C-scan imaging system, also designed and developed by the authors at Ultrasonic Instrumentation Section (Electronics Division, BARC) and supplied to Centre for Design and Manufacturer - CDM, BARC. This system is being regularly used in C-scan imaging mode for volumetric inspection of SS403 billets for end fittings of 500 MWe PHWRs. (author)

  2. Experimental and theoretical studies in Molten Salt Natural Circulation Loop (MSNCL)

    International Nuclear Information System (INIS)

    High Temperature Reactors (HTR) and solar thermal power plants use molten salt as a coolant, as it has low melting point and high boiling point, enabling us to operate the system at low pressure. Molten fluoride salt and molten nitrate salt are proposed as a candidate coolant for High Temperature Reactors (HTR) and solar power plant respectively. BARC is developing a 600 MWth pebble bed high temperature reactor, cooled by natural circulation of fluoride salt and capable of supplying process heat at 1000°C to facilitate hydrogen production by splitting water. Beside this, BARC is also developing a 2MWe solar power tower system using molten nitrate salt. With these requirements, a Molten Salt Natural Circulation Loop (MSNCL) has been designed, fabricated, installed and commissioned in Hall-7, BARC for thermal hydraulic, instrumentation development and material compatibility related studies. Steady state natural circulation experiments with molten nitrate salt (mixture of NaNO3 and KNO3 in 60:40 ratio) have been carried out in the loop at different power level. Various transients viz. startup of natural circulation, step power change, loss of heat sink and heater trip has also been studied in the loop. A well known steady state correlation given by Vijayan et. al. has been compared with experimental data. In-house developed code LeBENC has also been validated against all steady state and transient experimental results. The detailed description of MSNCL, steady state and transient experimental results and validation of in-house developed code LeBENC have been described in this report. (author)

  3. Dicty_cDB: Contig-U02610-1 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available 52 0.028 1 ( BH126744 ) BARC-Satt578 Size-selected soybean genomic Glycin... 52 0.028 1 ( FI249972 ) CccaBb012-L20JR CccABb Cajanus... cajan genomic clon... 52 0.028 1 ( FI238074 ) CccaBb015-C24JR CccABb Cajanus...z... 50 0.11 1 ( FI262698 ) CccaBb041-L13JR CccABb Cajanus cajan genomic clon... 50 0.11 1 ( CT419388 ) Sus

  4. Report on R and D activities of Health Physics Division 1994-1995

    International Nuclear Information System (INIS)

    This report is a compilation of the activities and also of the results of various R and D programmes of the Health Physics Division of Bhabha Atomic Research Centre (BARC) during the period 1994-1995. The topics covered are: environmental studies, radiation dosimetry- internal and external, operational health physics and nuclear safety, instruments and techniques, radiation physics, mathematical modelling and software development, micrometeorology and industrial hygiene. The matter is presented in the form of abstracts with the publication details. Also included are extracts from IAEA research agreements and the summary of theses submitted by the staff members of the Division during the above period

  5. Inclusive Charm Production in Two-Photon Collisions at LEP

    CERN Document Server

    Acciarri, M; Adriani, O; Aguilar-Benítez, M; Alcaraz, J; Alemanni, G; Allaby, James V; Aloisio, A; Alviggi, M G; Ambrosi, G; Anderhub, H; Andreev, V P; Angelescu, T; Anselmo, F; Arefev, A; Azemoon, T; Aziz, T; Bagnaia, P; Baksay, L; Balandras, A; Ball, R C; Banerjee, S; Banerjee, Sw; Banicz, K; Barczyk, A; Barillère, R; Barone, L; Bartalini, P; Basile, M; Battiston, R; Bay, A; Becattini, F; Becker, U; Behner, F; Berdugo, J; Berges, P; Bertucci, B; Betev, B L; Bhattacharya, S; Biasini, M; Biland, A; Blaising, J J; Blyth, S C; Bobbink, Gerjan J; Böck, R K; Böhm, A; Boldizsar, L; Borgia, B; Bourilkov, D; Bourquin, Maurice; Braccini, S; Branson, J G; Brigljevic, V; Brochu, F; Buffini, A; Buijs, A; Burger, J D; Burger, W J; Busenitz, J K; Button, A M; Cai, X D; Campanelli, M; Capell, M; Cara Romeo, G; Carlino, G; Cartacci, A M; Casaus, J; Castellini, G; Cavallari, F; Cavallo, N; Cecchi, C; Cerrada-Canales, M; Cesaroni, F; Chamizo-Llatas, M; Chang, Y H; Chaturvedi, U K; Chemarin, M; Chen, A; Chen, G; Chen, G M; Chen, H F; Chen, H S; Chéreau, X J; Chiefari, G; Cifarelli, Luisa; Cindolo, F; Civinini, C; Clare, I; Clare, R; Coignet, G; Colijn, A P; Colino, N; Costantini, S; Cotorobai, F; de la Cruz, B; Csilling, Akos; Dai, T S; van Dalen, J A; D'Alessandro, R; De Asmundis, R; Déglon, P L; Degré, A; Deiters, K; Della Volpe, D; Denes, P; De Notaristefani, F; De Salvo, A; Diemoz, M; Van Dierendonck, D N; Di Lodovico, F; Dionisi, C; Dittmar, Michael; Dominguez, A; Doria, A; Dova, M T; Duchesneau, D; Dufournaud, D; Duinker, P; Durán, I; El-Mamouni, H; Engler, A; Eppling, F J; Erné, F C; Extermann, Pierre; Fabre, M; Faccini, R; Falagán, M A; Falciano, S; Favara, A; Fay, J; Fedin, O; Felcini, Marta; Ferguson, T; Ferroni, F; Fesefeldt, H S; Fiandrini, E; Field, J H; Filthaut, Frank; Fisher, P H; Fisk, I; Forconi, G; Fredj, L; Freudenreich, Klaus; Furetta, C; Galaktionov, Yu; Ganguli, S N; García-Abia, P; Gataullin, M; Gau, S S; Gentile, S; Gheordanescu, N; Giagu, S; Goldfarb, S; Gong, Z F; Grünewald, M W; van Gulik, R; Gupta, V K; Gurtu, A; Gutay, L J; Haas, D; Hartmann, B; Hasan, A; Hatzifotiadou, D; Hebbeker, T; Hervé, A; Hidas, P; Hirschfelder, J; Hofer, H; Holzner, G; Hoorani, H; Hou, S R; Iashvili, I; Jin, B N; Jones, L W; de Jong, P; Josa-Mutuberria, I; Khan, R A; Kamrad, D; Kapustinsky, J S; Kaur, M; Kienzle-Focacci, M N; Kim, D; Kim, D H; Kim, J K; Kim, S C; Kinnison, W W; Kirkby, Jasper; Kiss, D; Kittel, E W; Klimentov, A; König, A C; Kopp, A; Korolko, I; Koutsenko, V F; Krämer, R W; Krenz, W; Kunin, A; Lacentre, P E; Ladrón de Guevara, P; Laktineh, I; Landi, G; Lapoint, C; Lassila-Perini, K M; Laurikainen, P; Lavorato, A; Lebeau, M; Lebedev, A; Lebrun, P; Lecomte, P; Lecoq, P; Le Coultre, P; Lee, H J; Le Goff, J M; Leiste, R; Leonardi, E; Levchenko, P M; Li Chuan; Lin, C H; Lin, W T; Linde, Frank L; Lista, L; Liu, Z A; Lohmann, W; Longo, E; Lü, Y S; Lübelsmeyer, K; Luci, C; Luckey, D; Luminari, L; Lustermann, W; Ma Wen Gan; Maity, M; Majumder, G; Malgeri, L; Malinin, A; Maña, C; Mangeol, D J J; Marchesini, P A; Marian, G; Martin, J P; Marzano, F; Massaro, G G G; Mazumdar, K; McNeil, R R; Mele, S; Merola, L; Meschini, M; Metzger, W J; Von der Mey, M; Migani, D; Mihul, A; Milcent, H; Mirabelli, G; Mnich, J; Molnár, P; Monteleoni, B; Moulik, T; Muanza, G S; Muheim, F; Muijs, A J M; Nahn, S; Napolitano, M; Nessi-Tedaldi, F; Newman, H; Niessen, T; Nippe, A; Nisati, A; Nowak, H; Oh, Yu D; Organtini, G; Ostonen, R; Palomares, C; Pandoulas, D; Paoletti, S; Paolucci, P; Park, H K; Park, I H; Pascale, G; Passaleva, G; Patricelli, S; Paul, T; Pauluzzi, M; Paus, C; Pauss, Felicitas; Peach, D; Pedace, M; Pei, Y J; Pensotti, S; Perret-Gallix, D; Petersen, B; Petrak, S; Piccolo, D; Pieri, M; Piroué, P A; Pistolesi, E; Plyaskin, V; Pohl, M; Pozhidaev, V; Postema, H; Pothier, J; Produit, N; Prokofev, D; Prokofiev, D O; Quartieri, J; Rahal-Callot, G; Raja, N; Rancoita, P G; Raven, G; Razis, P A; Ren, D; Rescigno, M; Reucroft, S; Van Rhee, T; Riemann, S; Riles, K; Robohm, A; Rodin, J; Roe, B P; Romero, L; Rosier-Lees, S; Roth, S; Rubio, Juan Antonio; Ruschmeier, D; Rykaczewski, H; Sakar, S; Salicio, J; Sánchez, E; Sanders, M P; Sarakinos, M E; Schäfer, C; Shchegelskii, V; Schmidt-Kärst, S; Schmitz, D; Scholz, N; Schopper, Herwig Franz; Schotanus, D J; Schwenke, J; Schwering, G; Sciacca, C; Sciarrino, D; Servoli, L; Shevchenko, S; Shivarov, N; Shoutko, V; Shukla, J; Shumilov, E; Shvorob, A V; Siedenburg, T; Son, D; Smith, B; Spillantini, P; Steuer, M; Stickland, D P; Stone, A; Stone, H; Stoyanov, B; Strässner, A; Sudhakar, K; Sultanov, G G; Sun, L Z; Suter, H; Swain, J D; Szillási, Z; Tang, X W; Tauscher, Ludwig; Taylor, L; Timmermans, C; Ting, Samuel C C; Ting, S M; Tonwar, S C; Tóth, J; Tully, C; Tung, K L; Uchida, Y; Ulbricht, J; Valente, E

    2000-01-01

    The cross section of charm production in $\\mathrm{\\gamma \\gamma}$ collisions $\\mathrm{\\sigma (e^+e^- \\rightarrow e^+e^-c\\bar{c} X)}$ is measured at LEP with the L3 detector at centre of mass energies from 91 GeV to 183 GeV. Charmed hadrons are identified by electrons and muons from semi-leptonic decays. The direct process $\\mathrm{\\gamma \\gamma \\rightarrow c \\bar{c}}$ is found to be insufficient to describe the data. The measured cross section values and event distributions require contributions from resolved processes, which are sensitive to the gluon density in the photon.

  6. Facilities Enhancement for IPY at Barrow

    Science.gov (United States)

    Sheehan, G.; Brown, J.; Coakley, B.; Zak, B.

    2007-12-01

    In connection with the International Polar Year, research facilities at Barrow have been markedly enhanced. On June 1st, Sen. Ted Stevens cut the ribbon at the Grand Opening of the Barrow Arctic Research Center (BARC). The BARC currently covers 18,000 sq. ft, with future phases anticipated, including 8 research labs, a necropsy lab for animal studies, freezers for biological samples, a state-of-the-art-data system, a planned Internet II connection, meeting spaces, and offices. There is a platform on the roof of the facility for instrumentation, and a communications tower to provide WIFI connections to remote instrumentation located on the adjacent Barrow Environmental Observatory (BEO). The BEO, which consists of 11 square miles of tundra and coastline set aside for environmental and ecological research, has also seen recent enhancements. A power line and a hard- surfaced trail now provide easy access to the interior of the BEO. Users of the BEO (and others) also have access to many different data sets continuously collected at the NOAA Global Monitoring Division Barrow Station and the DOE ARM (Atmospheric Radiation Measurement) Climate Research Facility (see http://www.esrl.noaa.gov/gmd/obop/brw.html and http://www.arm.gov/sites/nsa.stm respectively) also adjacent to the BEO. The National Weather Service Barrow Station also provides data of interest. Researchers submitting proposals to the National Science Foundation can include a request for the use of BARC and BEO facilities in their proposals. ARM facilities, recently augmented, can also be made available, but through arrangements made directly with ARM (BDZak@sandia.gov; 505-845-8631 or MDIvey@sandia.gov; 505-284-9092). BARC, BEO and ARM facilities are available to other agency and international users as well. For more information, see http://www.arcticscience.org, or contact Glenn Sheehan (907-852-4881, basc@arcticscience.org). The BEO consists of land owned by Ukpeagvik Inupiat Corporation, which is owned by

  7. Laser study into and explanation of the direct-indirect target concept

    Directory of Open Access Journals (Sweden)

    Borisenko N.G.

    2013-11-01

    Full Text Available The idea of direct-indirect target is experimentally tested with planar targets from LPI made of low-density metal foam (nanosnow or of nanoparticles (30% in plastic aerogels. The laser experiments in BARC have shown that compared to plain targets the foams of/with nanoparticles demonstrate: 1 better x-ray emissivity ; 2 smoother energy distribution over the target surface; 3 material flow from low-density wall being slower and more uniform; 4 active transverse energy transport over the target plane. These properties could be useful for hohlraums and direct-indirect concept.

  8. A report on the inter comparison of isotopic analyses by mass spectrometry for the laser enrichment of carbon-13

    International Nuclear Information System (INIS)

    A method has been standardized for the mass spectral analysis of (13C/12C) ratio in the isotopically enriched C2F4 photoproduct obtained by the CO2 laser photolysis of natural CF2HCI sample. For improving the quality of the spectra as well as enchancing the detection level of the product at very low concentrations, a pre-concentration technique has been developed by gas chromatography. Inter comparison of the results for analyses carried out with two different mass spectrometers, viz., a commercial instrument available at the Land PT Division and an indigenously built one by MS and ES, BARC showed a very good agreement. (author)

  9. Statistics of dose received by occupational personnel from neutron sources - 10 year study

    International Nuclear Information System (INIS)

    Personnel Monitoring Section, BARC conducts countrywide fast neutron personnel monitoring using CR-39 solid state nuclear track detector. About 1350 personnel working in a wide range of situations are being monitored presently for fast neutrons. Nearly 50% of the personnel monitored are working with isotopic neutron sources e.g. 241Am-Be (up to 740 GBq source strength) in industry and the remaining are connected with nuclear fuel cycle. This paper describes our experience with this personnel neutron monitor and presents the analysis of the neutron equivalent doses received by personnel working in industry during last 10 years and its contribution as compared to total equivalent dose. (author)

  10. Development of beam diagnostic devices for characterizing electron guns

    International Nuclear Information System (INIS)

    The electron guns for the DC accelerators and RF Linacs are designed and developed at EBC/APPD/BARC, Kharghar. These electron guns need to be characterized for its design and performance. Two test benches were developed for characterizing the electron guns. Various beam diagnostic devices for measuring beam currents and beam sizes were developed. Conical faraday cup, segmented faraday cup, slit scanning bellows movement arrangement, multi-plate beam size measurement setup, multi- wire beam size measurement setup, Aluminum foil puncture assembly etc. were developed and used. The paper presents the in-house development of various beam diagnostics for characterizing electron guns and their use. (author)

  11. Planificació estratègica de la vessant de Barcelona del Parc de Collserola: conversió de la carretera de les aigües en un eix cívic

    OpenAIRE

    Maristany Ventura, Montserrat

    2004-01-01

    El Parc de Collserola amb una superfície de més 8.000 Ha, està situat en el centre de l'àrea metropolitana de Barcelona, entre el riu Llobregat i el Besòs. Aquesta singularitat geogràfica fa que sigui un espai natural summament fràgil a les pertorbacions antròpiques. Durant els darrers anys diversos projectes desenvolupats al vessant barceloní de la Serra de Collserola han anat conformant noves realitats. Davant de la pressió antròpica a la que es troba sotmesa la vessant barce...

  12. Corrigendum to small power and heat generation systems on the basis of propulsion and innovative reactor technologies (IAEA-TECDOC-1172)

    International Nuclear Information System (INIS)

    Full text: - Footnote 1 on page 4 should read: ''1The results of the feasibility studies were presented by BARC at the meeting, but no paper was provided for publication in these proceedings.'' - On page 5, footnote 2 should be added to the following paragraph: ''CEA and TECHNICATOM (France) have about 200 reactor-years of experience from propulsion and small experimental reactors. Special design features for a future small reactor are formulated as follows2:'' (''2 At the meeting, these features were presented by CEA, Cadarache, but no paper was provided for publication in these proceedings.'')

  13. Preparation and deployment of indigenous 125I-seeds for the treatment of prostate cancer. Dawn of prostate brachytherapy in India

    International Nuclear Information System (INIS)

    'Permanent seed implantation' using 125I- seeds has emerged as an effective treatment modality for management of prostate cancer. An indigenous technology for the production of 125I brachytherapy sources ('BARC 125I Ocu-Prosta seed') has been developed. In this current work, we describe an overview of our experience on large scale production of 125I brachytherapy sources, their quality assessment, in vivo bio-evaluation and initial experience on their journey from bench to bed-side for the treatment of prostate cancer. (author)

  14. Physics and technology of tunable pulsed single longitudinal mode dye laser

    Indian Academy of Sciences (India)

    G Sridhar; V S Rawat; Nitin Kawade; Sunita Singh; L M Gantayet

    2010-11-01

    Design and technology demonstration of compact, narrow bandwidth, high repetition rate, tunable SLM dye lasers in two different configurations, namely Littrow and grazing incidence grating (GIG), were carried out in our lab at BARC, India. The single longitudinal mode (SLM) dye laser generates single-mode laser beams of ∼ 400 MHz (GIG configuration) and ∼ 600 MHz (Littrow configuration) bandwidth. Detailed performance studies of the Littrow and GIG dye laser resonators showed that GIG dye laser results in narrower linewidth and broad mode hop free wavelength scanning over 70 GHz. In this paper we present experimental studies carried out on the high repetition rate SLM dye laser system.

  15. A new technique for making large area beta reference sources required for calibration of surface contamination monitors

    International Nuclear Information System (INIS)

    A new technique has been developed for making large area reference beta sources required for the calibration of beta contamination monitors. Two 13 x 33 cm2 of 90Sr/90Y sources of surface activity 4-5 Bq/cm2 were prepared for testing of a typical large area contamination monitor developed by RSSD, BARC. Two 10 x 15 cm2 of 90Sr/90Y sources were also prepared as per ISO 8769. Surface non-uniformity of these sources was measured with the help of a specially designed jig. The non-uniformity in these sources was measured to be 15%. (author)

  16. Two-dimensional airflow modeling underpredicts the wind velocity over dunes

    OpenAIRE

    Britt Michelsen; Severin Strobl; Parteli, Eric J. R.; Thorsten Pöschel

    2015-01-01

    We investigate the average turbulent wind field over a barchan dune by means of Computational Fluid Dynamics. We find that the fractional speed-up ratio of the wind velocity over the three-dimensional barchan shape differs from the one obtained from two-dimensional calculations of the airflow over the longitudinal cut along the dune’s symmetry axis — that is, over the equivalent transverse dune of same size. This finding suggests that the modeling of the airflow over the central slice of barc...

  17. Advanced eddy current technique for measurement of annular gap between pressure tube and calandria tube in Indian Pressurized Heavy Water Reactors (PHWRs)

    International Nuclear Information System (INIS)

    In Indian Pressurised Heavy Water Reactors (PHWRs), the PT (pressure tube) is designed to be nominally concentric with the encircling CT (calandria tube). Due to various factors PT becomes eccentric with respect to CT over the life of reactor. If this becomes excessive, hot PT will come in contact with cold CT. Such a cold spot could act as potential location for initiating blister formation and premature failure of PT. Hence it is important to periodically measure annular gap between PT and CT. An advanced eddy current technique has been successfully developed and incorporated in BARCIS (BARC Channel Inspection System) for measurement of PT-CT gap. (author). 4 refs., 3 figs

  18. Measurement of the D_(sJ)(2317) and D_(sJ)(2460) Properties in e^+ e^- --> c c-bar Production

    CERN Document Server

    Aubert, B; Abrams, G S; Adye, T; Ahmed, S; Alam, M S; Albert, J; Aleksan, Roy; Allison, J; Allmendinger, T; Altenburg, D; Andreotti, M; Angelini, C; Anulli, F; Aston, D; Azzolini, V; Baak, M; Back, J J; Bailey, S; Baldini-Ferroli, R; Band, H R; Banerjee, Sw; Barate, R; Bard, D J; Barlow, N R; Barlow, R J; Barrett, M; Bartoldus, R; Batignani, G; Bauer, J M; Beck, T W; Behera, P K; Bellini, F; Benayoun, M; Berger, N; Bernard, D; Berryhill, J W; Best, D; Bettarini, S; Bettoni, D; Bevan, A J; Bhimji, W; Bianchi, F; Biasini, M; Blanc, F; Blaylock, G; Blinov, A E; Blinov, V E; Bloom, P; Bóna, M; Bondioli, M; Bonneaud, G R; Borgland, A W; Bosisio, L; Boutigny, D; Bowerman, D A; Boyarski, A M; Boyd, J T; Bozzi, C; Brandenburg, G; Brandt, T; Brau, J E; Breon, A B; Briand, H; Brochard, F; Brose, J; Brown, C L; Brown, C M; Brown, D; Brown, D N; Bruinsma, M; Brunet, S; Bucci, F; Buchanan, C; Buchmüller, O L; Bugg, W; Bulten, H; Burchat, Patricia R; Button-Shafer, J; Buzzo, A; Côté, D; Cahn, R N; Calabrese, R; Calcaterra, A; Calderini, G; Campagnari, C; Capra, R; Carpinelli, M; Cartaro, C; Cavallo, N; Cavoto, G; Chaisanguanthum, K S; Chao, M; Charles, E; Charles, M J; Chauveau, J; Chavez, C A; Chen, A; Chen, E; Chen, J C; Chen, S; Cheng, B; Cheng, C H; Chevalier, N; Christ, S; Cibinetto, G; Clark, P J; Claus, R; Cochran, J; Colecchia, F; Coleman, J P; Contri, R; Convery, M R; Cormack, C M; Cossutti, F; Cottingham, W N; Couderc, F; Covarelli, R; Cowan, G; Cowan, R; Crawley, H B; Cremaldi, L M; Cristinziani, M; Crosetti, G; Çuhadar-Dönszelmann, T; Dahmes, B; Dallapiccola, C; Danielson, N; Dasu, S; Datta, M; Dauncey, P D; David, P; Davier, M; Davis, C L; Day, C T; De Groot, N; De Nardo, Gallieno; Del Buono, L; Della Ricca, G; Di Lodovico, F; Dickopp, M; Dittongo, S; Dong, D; Dorfan, J; Dorigo, A; Druzhinin, V P; Dubitzky, R S; Dubois-Felsmann, G P; Dujmic, D; Dunwoodie, W M; Dvoretskii, A; Eckmann, R; Edwards, A J; Egede, U; Eichenbaum, A M; Eigen, G; Eisner, A M; Elmer, P; Elsen, E E; Emery, S; Ernst, J A; Eschenburg, V; Eschrich, I; Fabozzi, F; Faccini, R; Fan, S; Farbin, A; Feltresi, E; Ferrarotto, F; Ferroni, F; Field, R C; Finocchiaro, G; Flack, R L; Flächer, H U; Flood, K T; Ford, K E; Ford, W T; Forster, I J; Forti, F; Fortin, D; Foulkes, S D; Franek, B J; Frey, R; Fritsch, M; Fry, J R; Gabathuler, Erwin; Gaidot, A; Gaillard, J M; Gaillard, J R; Galeazzi, F; Gallo, F; Gamba, D; Gamet, R; Gan, K K; Ganzhur, S F; Gary, J W; Gaspero, M; Gatto, C; Geddes, N I; Gill, M S; Giorgi, M A; Giraud, P F; Giroux, X; Gladney, L; Glanzman, T; Godang, R; Goetzen, K; Golubev, V B; Gopal, G P; Gowdy, S J; Graham, M; Grancagnolo, S; Green, M G; Greene, M G; Grenier, G J; Grenier, P; Gritsan, A V; Grosdidier, G; Groysman, Y; Guo, Q H; Hadavand, H K; Hadig, T; Haire, M; Halyo, V; Hamel de Monchenault, G; Hamon, O; Harrison, P F; Harrison, T J; Hart, A J; Hart, P A; Hartfiel, B L; Harton, J L; Hast, C; Hauke, A; Hawkes, C M; Hearty, C; Held, T; Hertzbach, S S; Heusch, C A; Hicheur, A; Hill, E J; Hitlin, D G; Höcker, A; Hodgkinson, M C; Hollar, J J; Honscheid, K; Hrynóva, T; Hufnagel, D; Hulsbergen, W D; Hutchcroft, D E; Igonkina, O; Innes, W R; Ivanchenko, V N; Izen, J M; Jackson, P D; Jackson, P S; Jacobsen, R G; Jawahery, A; Jayatilleke, S M; Jessop, C P; John, M J J; Johnson, J R; Judd, D; Kadel, R W; Kadyk, J; Kagan, H; Karyotakis, Yu; Kass, R; Kelly, M P; Kelsey, M H; Kerth, L T; Khan, A; Kim, H; Kim, P; Kirkby, D; Kitayama, I; Knecht, N S; Koch, H; Kocian, M L; Kofler, R; Kolomensky, Yu G; Koptchev, V B; Kovalskyi, D; Kowalewski, R V; Kozanecki, Witold; Kravchenko, E A; Krishnamurthy, M; Kroeger, R; Kroseberg, J; Kukartsev, G; Kutter, P E; Kyberd, P; Lacker, H M; Lae, C K; Lafferty, G D; Lamsa, J; Lanceri, L; Lange, D J; Langenegger, U; Lankford, A J; Laplace, S; Latham, T E; Lau, Y P; Lavin, D; Lazzaro, A; Le Diberder, F R; Lees, J P; Legendre, M; Leith, D W G S; Lepeltier, V; Leruste, P; Lewandowski, B; Li Gioi, L; Li, H; Libby, J; Lillard, V; Lista, L; Liu, R; LoSecco, J M; Lo Vetere, M; Lockman, W S; Lombardo, V; London, G W; Long, O; Lou, X C; Lu, A; Lü, C; Luitz, S; Luppi, E; Lusiani, A; Lüth, V; Lutz, A M; Lynch, G; Lynch, H L; Lyon, A J; MacFarlane, D B; Macri, M; Malcles, J; Mallik, U; Mancinelli, G; Mandelkern, M A; Manfredi, P F; Mangeol, D J J; Marchiori, G; Margoni, M; Marsiske, H; Martínez-Vidal, F; Mattison, T S; Mayer, B; Mazur, M A; Mazzoni, M A; McKenna, J A; McMahon, T R; Meadows, B T; Messner, R; Meyer, T I; Meyer, W T; Miftakov, V; Mihályi, A; Mir, L M; Mohanty, G B; Mohapatra, A K; Mommsen, R K; Monge, M R; Monorchio, D; Moore, T B; Morandin, M; Morgan, S E; Morganti, M; Morganti, S; Morii, M; Morton, G W; Muheim, F; Müller, D R; Müller-Pfefferkorn, R; Narsky, I; Nash, J A; Nauenberg, U; Neal, H; Negrini, M; Neri, N; Nesom, G; Nicholson, H; Nikolich, M B; Nogowski, R; O'Grady, C P; Ocariz, J; Oddone, P J; Ofte, I; Olaiya, E O; Olivas, A; Olsen, J; Onuchin, A P; Orimoto, T J; Otto, S; Ozcan, V E; Paar, H P; Paick, K; Palano, A; Palombo, F; Pan, Y; Panetta, J; Panvini, R S; Paoloni, E; Paolucci, P; Parry, R J; Passaggio, S; Patel, P M; Patrignani, C; Patteri, P; Payne, D J; Pelizaeus, M; Perazzo, A; Perl, M; Peruzzi, I M; Petersen, B A; Petersen, T C; Petrak, S; Petzold, A; Piatenko, T; Piccolo, D; Piccolo, M; Piemontese, L; Pierini, M; Pioppi, M; Piredda, G; Pivk, M; Plaszczynski, S; Playfer, S; Pompili, A; Poropat, P; Porter, F C; Posocco, M; Potter, C T; Prell, S; Prepost, R; Pripstein, M; Pulliam, T; Purohit, M V; Qi, N D; Rahatlou, S; Rahimi, A M; Rama, M; Rankin, P; Ratcliff, B N; Raven, G; Re, V; Reidy, J; Ricciardi, S; Richman, J D; Ritchie, J L; Rizzo, G; Roat, C; Roberts, D A; Robertson, S H; Robutti, E; Roe, N A; Röthel, W; Ronan, Michael T; Roney, J M; Rong, G; Roodman, A; Roos, L; Rosenberg, E I; Rotondo, M; Rubin, A E; Ryd, A; Saeed, M A; Safai-Tehrani, F; Saleem, M; Salnikov, A A; Salvatore, F; Samuel, A; Sanders, D A; Sandrelli, F; Santroni, A; Saremi, S; Sarti, A; Satpathy, A; Schalk, T; Schindler, R H; Schott, G; Schrenk, S; Schubert, J; Schubert, Klaus R; Schumm, B A; Schune, M H; Schwiening, J; Schwierz, R; Schwitters, R F; Sciacca, C; Sciolla, G; Seiden, A; Sekula, S J; Serednyakov, S I; Sharma, V; Shelkov, V G; Shen, B C; Simani, M C; Simi, G; Simonetto, F; Sinev, N B; Skovpen, Yu I; Sloane, R J; Smith, A J S; Smith, J G; Snoek, H L; Snyder, A; Sobie, R J; Soffer, A; Soha, A; Sokoloff, M D; Solodov, E P; Spaan, B; Spanier, S M; Spradlin, P; Stängle, H; Steinke, M; Stelzer, J; Stoker, D P; Stroili, R; Strom, D; Stugu, B; Su, D; Sullivan, M K; Summers, D J; Sundermann, J E; T'Jampens, S; Tan, P; Tantot, L; Taras, P; Taylor, F; Taylor, G P; Telnov, A V; Teodorescu, L; Ter-Antonian, R; Therin, G; Thiebaux, C; Thiessen, D; Tiozzo, G; Tisserand, V; Toki, W H; Torrence, E; Tosi, S; Touramanis, C; Treadwell, E; Vasileiadis, G; Vasseur, G; Vavra, J; Verderi, M; Verkerke, W; Vitale, L; Voci, C; Voena, C; Vuagnin, G; Wagner, G; Wagner, S R; Wagoner, D E; Waldi, R; Walsh, J; Wang, K; Wang, P; Wappler, F R; Watson, A T; Weaver, M; Weidemann, A W; Weinstein, A J R; Wenzel, W A; Wilden, L; Williams, D C; Williams, J C; Willocq, S; Wilson, F F; Wilson, J R; Wilson, M G; Wilson, R J; Winter, M A; Wisniewski, W J; Wittgen, M; Won, E; Wong, Q K; Wormser, G; Wright, D H; Wright, D M; Wu, J; Wu, S L; Xie, Y; Yamamoto, R K; Yang, S; Yarritu, A K; Ye, S; Yéche, C; Yi, J; Young, C C; Yu, Z; Yumiceva, F X; Yushkov, A N; Zallo, A; Zeng, Q; Zghiche, A; Zhang, J; Zhang, L; Zhao, H W; Zhu, Y S; Zito, M; De Sangro, R; Del Re, D; La Vaissière, C de

    2004-01-01

    The properties of the $\\DsTT$ and $\\DsFE$ mesons are studied using 125 ${\\rm fb}^{-1}$ of $e^+e^- \\to c \\bar{c}$ data collected by the BaBar experiment. Preliminary mass estimates of $[2318.9\\pm 0.3 ({\\rm stat.}) \\pm 0.9 ({\\rm syst.})]$ \\mevcc and $[2459.4 \\pm 0.3 ({\\rm stat.}) \\pm 1.0 ({\\rm syst.})]$ \\mevcc are obtained. Searches are performed for the decay to the $D_s^+$ meson along with one or more $\\piz$, $\\pi^+$, or $\\gamma$ particles. A search is also performed for neutral and doubly-charged partners.

  19. Selected bibliography on heavy water, tritiated water and hydrogen isotopes (1981-1992)

    International Nuclear Information System (INIS)

    A selected bibliography on heavy water, tritiated water and hydrogen isotopes is presented. This bibliography covers the period 1981-1992 and is in continuation to Division's earlier report BARC-1192 (1983). The sources of information for this compilation are Chemical Abstracts, INIS Atom Index and also some scattered search through journals and reports available in our library. No claim is made towards exhaustiveness of this bibliography even though sincere attempts have been made for a wide coverage. The bibliography is arranged under the headings: (1) production, purification, recovery, reprocessing and storage, (2) isotope exchange, 3) isotope analysis, (4) properties and (5) miscellaneous. Total number of references in the bibliography are 1762. (author)

  20. The national project on nuclear desalination in India

    International Nuclear Information System (INIS)

    BARC (Bhabha Atomic Research Centre) has successfully developed both thermal and membrane desalination technologies for seawater and brackish water desalination. 425 m3/d Multi-Stage-Flash (MSF) desalination plant producing good quality water from seawater suitable for drinking and industrial water requirements operated. Knowhow developed for Low Temperature Vacuum Evaporation (LTVE) desalination plants utilizing waste heat. Reverse Osmosis (RO) technology developed at the centre has been successfully demonstrated. The experience obtained from the above plants has been utilized for designing a large scale hybrid desalination plant based on MSF and RO for augmenting the drinking water supply in water scarcity coastal areas

  1. Selected bibliography on heavy water, tritiated water and hydrogen isotopes (1981-1992)

    Science.gov (United States)

    Gopalakrishnan, V. T.; Sutawane, U. B.; Rathi, B. N.

    A selected bibliography on heavy water, tritiated water and hydrogen isotopes is presented. This bibliography covers the period 1981-1992 and is in continuation to Division's earlier report BARC-1192 (1983). The sources of information for this compilation are Chemical Abstracts, INIS Atom Index and also some scattered search through journals and reports available in our library. No claim is made towards exhaustiveness of this bibliography even though sincere attempts have been made for a wide coverage. The bibliography is arranged under the headings: (1) production, purification, recovery, reprocessing and storage; (2) isotope exchange; (3) isotope analysis; (4) properties; and (5) miscellaneous. Total number of references in the bibliography are 1762.

  2. Studies on the separation of 99Mo from U-Al alloy target and recovery of 235U using TBP

    International Nuclear Information System (INIS)

    Indian nuclear medicine community needs continuous and reliable supply of fission 99Mo to promote the beneficial use of 99mTc in the country. To make it available indigenously irradiation of low enriched uranium target is being looked into. Various steps involved in the production are target fabrication, irradiation, dissolution, recovery of 99Mo and its purification, fabrication of generator and management of waste. To understand the separation chemistry of Mo from such source preliminary experiments was carried out. A natural uranium-aluminum alloy fuel target fabricated at NFG, BARC was dissolved and analyzed. The alloy was found to contain ∼ 25% uranium as expected

  3. Design studies of a high-current radiofrequency quadrupole for accelerator-driven systems programme

    Indian Academy of Sciences (India)

    S V L S Rao; P Singh

    2010-02-01

    A 3 MeV, 30 mA radiofrequency quadrupole (RFQ) accelerator has been designed for the low-energy high-intensity proton accelerator (LEHIPA) project at BARC, India. The beam and cavity dynamics studies were performed using the computer codes LIDOS, TOUTATIS, SUPERFISH and CST microwave studio. We have followed the conventional design technique with slight modifications and compared that with the equipartitioned (EP) type of design. The sensitivity of the RFQ to the variation of input beam Twiss–Courant parameters and emittance has also been studied. In this article we discuss both design strategies and the details of the 3D cavity simulation studies.

  4. BARCODE DEKODET : En diskursanalyse av byutviklingsdebatten om utbyggingsprosjektet Barcode i Bjørvika

    OpenAIRE

    2009-01-01

    Denne oppgaven handler om "byutviklingsdebatten om Barcode". Utbyggingsprosjektet Barcode ble kåret til vinner av en arkitektkonkurranse for fire tomter i Bjørvika våren 2003. Disse tomtene ligger like sør for sporområdet på Oslo Sentralstasjon. Da utbyggerne for tomtene, Oslo S Utvikling, kom med et nytt reguleringsforslag for området der byggehøydene økes i tråd med Barcode-prinsippet, kom det inn usedvanlig mange kritiske reaksjoner til PBE. Dette var kimen til byutviklingsdebatten om Barc...

  5. Estimation of thermal neutron flux from natZr activity

    International Nuclear Information System (INIS)

    Neutron transmutation doped (NTD) Ge thermistors are developed as low temperature thermometry (in mK range) in the cryogenic Tin bolometer, the India-based TIN detector (TIN.TIN). For this purpose, semiconductor grade Ge wafers are irradiated with thermal neutron at Dhruva reactor, BARC and dopant concentration critically depends on thermal neutron fluence. In order to obtain an independent estimate of the thermal neutron flux, natZr is used in one of the irradiations. The irradiated natZr samples have been studied in the Tifr Low background Experimental Setup (TiLES). The thermal neutron flux is estimated from the activity of 95Zr

  6. Testing Color Evaporation in Photon-Photon Production of $J/\\Psi$ at CERN LEP II

    CERN Document Server

    Éboli, Oscar J P; Mizukoshi, J K

    2003-01-01

    The DELPHI Collaboration has recently reported the measurement of J/Psi production in photon-photon collisions at LEP II. These newly available data provide an additional proof of the importance of colored c bar{c} pairs for the production of charmonium because these data can only be explained by considering resolved photon processes. We show here that the inclusion of color octet contributions to the J/Psi production in the framework of the color evaporation model is able to reproduce this data. In particular, the transverse-momentum distribution of the J/Psi mesons is well described by this model.

  7. Ús del mètode puzzle de treball cooperatiu a l'assignatura d'Etnologia per a la identificació racial

    OpenAIRE

    Izquierdo i Tugas, M. Dolors Departament de Ciència Animal i dels Aliments

    2015-01-01

    Les jornades d’innovació docent a la Facultat de Veterinària tenen per objectiu l'intercanvi d'experiències docents entre el professorat de la Facultat com a punt de partida per reflexionar sobre l’estat actual de la docència i estimular la inclusió de noves activitats d'innovació als estudis de grau. Aquestes jornades estan organitzades pel Grup d'Innovació Docent de la Facultat de Veterinària amb el suport de la Unitat de Formació i Innovació Docent (OQD) de la Universitat Autònoma de Barce...

  8. Planning and commissioning of a multipurpose election beam accelerator

    International Nuclear Information System (INIS)

    Full text: Electron beam (EB) irradiation is extensively used in a number of industries such as wire and cable, polyethylene foam, curing and converting, automobile tyre, sterilization, flue gas treatment etc. The efforts to introduce this sophisticated technology in the country gathered momentum with the commissioning of the ILU- 6 EB accelerator in BARC during 1980. The need for indigenisation of the EB accelerator components, particularly insulation formulations has been recognised and the issue was given due consideration by the Indian cable industry in the light of specifications laid by Indian Railways for the EB irradiation cross-linked wires and cables. Nicco Corporation Ltd. has developed the necessary insulation formulations for EB cross-linking of wires and also for heat shrinking accessories in collaboration with BARC, and IIT, Kharagpur with assistance from BRNS. The Company also ventured to establish an in-house EB accelerator at its premises. This paper highlights the various aspects of planning and commissioning of this collaborative effort

  9. Mercury's gravity, tides, and spin from MESSENGER radio science data

    CERN Document Server

    Verma, Ashok Kumar

    2016-01-01

    We analyze radio tracking data obtained during 1311 orbits of the MESSENGER spacecraft in the period March 2011 to April 2014. A least-squares minimization of the residuals between observed and computed values of two-way range and Doppler allows us to solve for a model describing Mercury's gravity, tidal response, and spin state. We use a spherical harmonic representation of the gravity field to degree and order 40 and report error bars corresponding to 10 times the formal uncertainties of the fit. Our estimate of the product of Mercury's mass and the gravitational constant, $GM = (22031.87404 \\pm 9 \\times 10^{-4})$ km$^{3}$s$^{-2}$, is in excellent agreement with published results. Our solution for the geophysically important second-degree coefficients ($\\bar{C}_{2,0} = -2.25100 \\times 10^{-5} \\pm 1.3 \\times 10^{-9}$, $\\bar{C}_{2,2} = 1.24973 \\times 10^{-5} \\pm 1.2 \\times 10^{-9}$) confirms previous estimates to better than 0.4\\% and, therefore, inferences about Mercury's moment of inertia and interior struc...

  10. Minimizing wafer defectivity during high-temperature baking of organic films in 193nm lithography

    Science.gov (United States)

    Randall, Mai; Longstaff, Christopher; Ueda, Kenichi; Nicholson, Jim; Winter, Thomas

    2006-03-01

    Demands for continued defect reduction in 300mm IC manufacturing is driving process engineers to examine all aspects of the apply process for improvement. Process engineers, and their respective tool sets, are required to process films at temperatures above the boiling point of the casting solvents. This can potentially lead to the sublimation of the film chemical components. The current methods used to minimize wafer defectivity due to bake residues include frequent cleaning of bake plate modules and surrounding equipment, process optimization, and hardware improvements until more robust chemistries are available. IBM has evaluated the Tokyo Electron CLEAN TRACK TM ACT TM 12 high exhaust high temperature hotplate (HHP) lid to minimize wafer level contamination due to the outgasing of a bottom anti-reflective coating (BARC) films during the high temperature bake process. Goal was to minimize airborne contamination (particles in free space), reduce hotplate contamination build up, and ultimately reduce defects on the wafer. This evaluation was performed on a 193nm BARC material. Evaluation data included visual hardware inspections, airborne particle counting, relative thickness build up measurements on hotplate lids, wafer level defect measurements, and electrical open fail rate. Film coat thickness mean and uniformity were also checked to compare the high exhaust HHP with the standard HHP lid. Chemical analysis of the HHP module residue was performed to identify the source material. The work will quantify potential cost savings achieved by reducing added wafer defects during processing and extending PM frequency for equipment cleaning.

  11. Improving material-specific dispense processes for low-defect coatings

    Science.gov (United States)

    Brakensiek, Nick; Braggin, Jennifer; Berron, John; Ramirez, Raul; Anderson, Karl; Smith, Brian

    2011-04-01

    The drive to smaller, less expensive, and faster devices requires radical changes in material development. The increased material requirements drive complex processes that in turn drive equipment requirements. For the photolithography area this demand for improved materials is seen in growing requests for device level-specific tuning of organic bottom antireflective coatings (BARCs) or photoresists for certain imaging requirements, such as numerical aperture, immersion conditions, and optical parameters. To test and utilize the myriad of BARC materials, there is a need to install them on a coater-track quickly and efficiently. Installation typically requires a new filter installation, dispense line cleaning, and usually a minimum of 8-10 L of material to clear out bubbles and other nuisance defects before coating test wafers. As the number of materials increases, the ability to quickly prime a new filter becomes increasingly important. In this study, the Entegris IntelliGen® Mini dispense system was utilized to test various pump priming processes to ultimately minimize the volume purged to reach a defect baseline. In addition, the impacts of the filter media and filter retention on priming efficiency were studied. Results show that priming processes that were not matched to the filter in use could actually cause the defects to increase during the process, thus requiring additional purging to reach baseline, and thereby negating any time or volume savings. Properly programmed priming recipes reduced the purging time and the purging volume by 50-70%.

  12. Investigation of zirconium phosphate Zr3(PO4)4 during heating

    International Nuclear Information System (INIS)

    Zirconium phosphate Zr3(PO4)4 has been synthesized by the sol-gel technique and investigated using X-ray powder diffraction, IR spectroscopy, and differential scanning calorimetry. It has been established that the symmetry of the unit cell, R3-barc, which is characteristic of the NaZr2(PO4)3 (NZP) family, is lowered to P3-barc. The behavior of the zirconium phosphate during heating has been examined using high-temperature X-ray diffraction at temperatures ranging from 25 to 575 deg. C. It has been revealed that the structure of the zirconium phosphate is hardly subjected to expansion due to heating in the temperature ranges 25-125 deg. C (αa -6 K-1, αc -6 K-1, Δα -6 K-1) and 325-575oC (αa = -1.4 x 10-6 K-1, αc -6 K-1, Δα -6 K-1). In the temperature range 125-325oC, the synthesized compound undergoes a second-order phase transition (upon heating), which is accompanied by the contraction of the structure along all crystallographic directions. Upon cooling in the range from 75 to 25 deg. C, the phase transition is accompanied by the expansion of the structure.

  13. Design and development of R.F. LINAC accelerator components

    International Nuclear Information System (INIS)

    Full text: Radio frequency linear accelerator, a high power electron LINAC technology, is being developed at BARC. These accelerators are considered to be the most compact and effective for a given power capacity. Important application areas of this LINAC include medical sterilization, food preservation, pollution control, semiconductor industries, radiation therapy and material science. Center for Design and Manufacture (CDM), BARC has been entrusted with the design, development and manufacturing of various mechanical components of the accelerator. Most critical and precision components out of them are Diagnostic chamber, Faraday cup, Drift tube and R.F. cavities. This paper deals with the design aspects in respect of Ultra high vacuum compatibility and the mechanism of operation. Also this paper discusses the state-of-art technology for machining of intricate contour using specially designed poly crystalline diamond tool and the inspection methodology developed to minimize the measurement errors on the machined contour. Silver brazing technique employed to join the LINAC cavities is also described in detail

  14. Contamination control and revegetation (Field trials)

    International Nuclear Information System (INIS)

    The LLNL/DOE field program at Bikini Atoll began in 1977. The first few years were devoted to developing an adequate data base from which to do an updated dose assessment of Bikini and Eneu Islands. The results indicated that 137Cs was the most significant radionuclide, actually accounting for more than 90% of the total estimated wholebody and bone marrow dose, and that the terrestrial food chain (especially coconut) was the most significant potential exposure pathway. Strontium-90 accounts for only about 507% of the total bone marrow dose and the transuranics, 239+240 Pu and 241Am, less than 1%. Thus, if the intake of 137Cs can be reduced to 10% or less of its current concentration in food crops the radiological dose for Bikini Island would be within federal guidelines. However, samples of vegetation and soil will be analyzed for Sr and the transuranics to ensure an adequate data for evaluation of these radionuclide. In 1980, prior to the formation of the BARC, the goals of our Marshall Island program were extended to include an initial evaluation of methods to reduce the uptake of 137Cs by food crops and/or reduce the 137Cs soil inventory. We expanded one of our experiments and added two more when the BARC was formed and additional funding became available for evaluating the rehabilitation of Bikini Atoll

  15. Study of supercritical carbon dioxide natural circulation by the use of CFD codes

    International Nuclear Information System (INIS)

    In this paper, experiments on natural circulation of CO2, previously performed at the Bhabha Atomic Research Centre (BARC), are addressed by the use of the FLUENT and the STAR-CCM+ CFD codes. The experiments were carried out in an experimental facility installed at the Reactor Engineering Division of BARC in Mumbai, consisting in a uniform diameter (13.88 mm ID & 21.34 mm OD) rectangular loop (SCNCL) with different orientations of heater and cooler, which can operate with either supercritical water and supercritical carbon dioxide. The tests with carbon dioxide were performed at different power levels, at the supercritical pressures of 8.6 and 9.1 MPa. The steady-state characteristics of the loop were obtained for the horizontal heater and the horizontal cooler configuration (HHHC) and for the horizontal heater and vertical cooler one (HHVC). Unstable behaviour was observed only for the HHHC configuration. The FLUENT and the STAR-CCM+ codes were adopted for reproducing the observed behaviour of the experimental loop in the HHHC configuration. Steady-state as well as transient analyses were performed to be compared with the observed behaviour of the loop. (author)

  16. A primary standard for the measurement of alpha and beta particle surface emission rate from large area reference sources.

    Science.gov (United States)

    Ravindra, Anuradha; Kulkarni, D B; Joseph, Leena; Kulkarni, M S; Babu, D A R

    2016-01-01

    A large area windowless gas flow multi wire proportional counting system for the calibration of large area reference sources has been developed as a primary standard at Bhabha Atomic Research Centre (BARC). The counting system consists of a multi wire proportional counter (MWPC), vacuum system, gas flow system and pulse processing units. The MWPC detector assembly consists of a vacuum tight aluminum enclosure, multi wire grid and sliding source tray. Various detector characteristics like operating characteristics curve, Fe-55 spectrum for beta discriminator threshold setting and dead time of the measurement system were studied and determined in order to achieve an optimized detection capability. The surface emission rates of different source strengths were measured and their relative combined standard uncertainties were determined. Large Area Sources Comparison Exercise (LASCE) was organized by International Committee on Radionuclide Metrology (ICRM) working group and coordinated by National Institute for Ionising Radiation Metrology (ENEA), Italy, to demonstrate equivalence of surface emission rate measurements at the international platform. BARC participated in the programme and the results of LASCE are also discussed in this paper. PMID:26457924

  17. ASSEMBLY and CHARACTERIZATION OF RESISTIVE PLATE CHAMBERS IN INDIA FOR THE CMS DETECTOR

    CERN Document Server

    Kumar, Ramandeep

    2015-01-01

    The Compact Muon Solenoid (CMS) experiment is a general purpose detector being operated at Large Hadron Collider (LHC) facility at CERN. The RE4 upgrade project was envisaged to improve the Level-1 trigger efficiency in the forward region, when LHC would run at its full designed energy and luminosity after the first Long Shutdown (LS-1, 2013-2014). About 200 RPCs were built for the upgrade at three assembly sites in India, CERN and Ghent. India contributed to 50, RE4/2 RPCs along with 200 Cu-cooling units for the entire upgrade for which the assembly and characterization of RPCs was carried out jointly by Nuclear Physics Division-BARC and Panjab University-Chandigarh. The gas-gaps after their arrival from KODEL, South Korea, underwent mechanical tests for leak and popped spacers, followed by electrical tests for long term monitoring of leakage currents. After the assembly, each RPC was evaluated for its efficiency, cluster size, noise and strip profiles. The Cu-cooling units build at BARC were also tested acc...

  18. Quark-flavour violating Higgs decays to charm and bottom pairs in the MSSM

    CERN Document Server

    Ginina, E; Bartl, A; Hidaka, K; Majerotto, W

    2016-01-01

    We calculate the decay width of $h^0 \\to b \\bar{b}$ in the Minimal Supersymmetric Standard Model (MSSM) with quark-flavour violation (QFV) at full one-loop level. The effect of $\\tilde{c}-\\tilde{t}$ mixing and $\\tilde{s}-\\tilde{b}$ mixing is studied taking into account the constraints from the B-meson data. We discuss and compare in detail the decays $h^0 \\to c \\bar{c}$ and $h^0 \\to b \\bar{b}$ within the framework of the perturbative mass insertion technique using the Flavour Expansion Theorem. The deviation of both decay widths from the Standard Model results can be quite large. While in $h^0 \\to c \\bar{c}$ it is almost entirely due to the flavour violating part of the MSSM, in $h^0 \\to b \\bar{b}$ it is mainly due to the flavour conserving part. Nevertheless, $\\Gamma(h^0 \\to b \\bar{b})$ can fluctuate up to $\\sim 7\\%$ due to QFV chargino exchange with large $\\tilde{c}-\\tilde{t}$ mixing. due to QFV chargino exchange with large $\\tilde{c}-\\tilde{t}$ mixing.

  19. Study of supercritical carbon dioxide natural circulation by the use of CFD codes

    Energy Technology Data Exchange (ETDEWEB)

    Molfese, E.; Ambrosini, W.; Forgione, N., E-mail: w.ambrosini@ing.unipi.it, E-mail: n.forgione@ing.unipi.it [Univ. of Pisa, Dipartimento di Ingegneria Meccanica Nucleare e della Produzione (Italy); Vijayan, P.K.; Sharma, M., E-mail: vijayanp@barc.gov.in, E-mail: manishs@barc.gov.in [Bhabha Atomic Research Centre, Reactor Engineering Div., Mumbai (India)

    2011-07-01

    In this paper, experiments on natural circulation of CO{sub 2}, previously performed at the Bhabha Atomic Research Centre (BARC), are addressed by the use of the FLUENT and the STAR-CCM+ CFD codes. The experiments were carried out in an experimental facility installed at the Reactor Engineering Division of BARC in Mumbai, consisting in a uniform diameter (13.88 mm ID & 21.34 mm OD) rectangular loop (SCNCL) with different orientations of heater and cooler, which can operate with either supercritical water and supercritical carbon dioxide. The tests with carbon dioxide were performed at different power levels, at the supercritical pressures of 8.6 and 9.1 MPa. The steady-state characteristics of the loop were obtained for the horizontal heater and the horizontal cooler configuration (HHHC) and for the horizontal heater and vertical cooler one (HHVC). Unstable behaviour was observed only for the HHHC configuration. The FLUENT and the STAR-CCM+ codes were adopted for reproducing the observed behaviour of the experimental loop in the HHHC configuration. Steady-state as well as transient analyses were performed to be compared with the observed behaviour of the loop. (author)

  20. Design and development of cryo-module test system for 1.3 GHz LCLS-II cryomodule

    International Nuclear Information System (INIS)

    Cryomodule Test System (CMTS) is a major cryogenic system designed and developed at Centre for Design and Manufacture (CDM), BARC under Indian Institutions and Fermi Lab Collaboration (IIFC). It is necessary test bed to measure the performance of superconducting RF cavities in Cryomodule. CMTS is required to test 1.3 GHz LCLS-II Cryomodule for Stanford Linear Accelerator Centre (SLAC), USA. Feed Cap and End Cap sub systems of Cryomodule Test System (CMTS) is designed and developed at CDM, BARC. Feed cap and End cap are 2K liquid helium distribution system for LCLS-II RF Cavity Bath and insulated by intermediate radiation shields maintained at 5K and 40K and Multilayer Insulation. The whole distribution system is enclosed in horizontal vacuum shells of approximately 1100 mm in diameter and 3000 mm in total length. This development was very challenging as many design considerations and decisions for 2K cryogenic requirements have been made and implemented. Also intricate mounting of ceramic sensors both internally and externally (surface mounted) for very low temperature measurements, low temperature epoxy bonding and multi-layer insulation wrapping were successfully completed. (author)

  1. My Research Visiting Card in Hamiltonian Graph Theory

    CERN Document Server

    Nikoghosyan, Zh G

    2012-01-01

    We present eighteen exact analogs of six well-known fundamental Theorems (due to Dirac, Nash-Williams and Jung) in hamiltonian graph theory providing alternative compositions of graph invariants. In Theorems 1-3 we give three lower bounds for the length of a longest cycle $C$ of a graph $G$ in terms of minimum degree $\\delta$, connectivity $\\kappa$ and parameters $\\bar{p}$, $\\bar{c}$ - the lengths of a longest path and longest cycle in $G\\backslash C$, respectively. These bounds have no analogs in the area involving $\\bar{p}$ and $\\bar{c}$ as parameters. In Theorems 11 and 12 we give two Dirac-type results for generalized cycles including a number of fundamental results (concerning Hamilton and dominating cycles) as special cases. Connectivity invariant $\\kappa$ appears as a parameter in some fundamental results and in some their exact analogs (Theorems 3-10) in the following chronological order: 1972 (Chv\\'{a}tal and Erd\\"{o}s), 1981a (Nikoghosyan), 1981b (Nikoghosyan), 1985a (Nikoghosyan), 1985b (Nikoghosya...

  2. 2D numerical simulation of passive autocatalytic recombiner for hydrogen mitigation

    Science.gov (United States)

    Gera, B.; Sharma, P. K.; Singh, R. K.

    2012-04-01

    Resolving hydrogen related safety issues, pertaining to nuclear reactor safety has been an important area of research world over for the past decade. The studies on hydrogen transport behavior and development of hydrogen mitigation systems are still being pursued actively in various research labs, including Bhabha Atomic Research Centre (BARC), in India. The passive autocatalytic recombiner (PAR) is one of such hydrogen mitigating device consisting of catalyst surfaces arranged in an open-ended enclosure. In the plate type recombiner design sheets made of stainless steel and coated with platinum catalyst material are arranged in parallel inside a flow channel. The catalyst elements are exposed to a constant flow of a mixture of air, hydrogen and steam, a catalytic reaction occurs spontaneously at the catalyst surfaces and the heat of reaction produces natural convection flow through the enclosure. Numerical simulation and experiments are required for an in-depth knowledge of such plate type PAR. Specific finite volume based in-house 2D computational fluid dynamics (CFD) code has been developed to model and analyse the working of these recombiners and has been used to simulate one literature quoted experiment. The validation results were in good agreement against literature quoted German REKO experiments. Parametric study has been performed for particular recombiner geometry for various inlet conditions. Salient features of the simplified CFD model developed at BARC and results of the present model calculations are presented in this paper.

  3. 2D numerical simulation of passive autocatalytic recombiner for hydrogen mitigation

    Energy Technology Data Exchange (ETDEWEB)

    Gera, B.; Sharma, P.K.; Singh, R.K. [Bhabha Atomic Research Centre, Reactor Safety Division, Trombay, Mumbai (India)

    2012-04-15

    Resolving hydrogen related safety issues, pertaining to nuclear reactor safety has been an important area of research world over for the past decade. The studies on hydrogen transport behavior and development of hydrogen mitigation systems are still being pursued actively in various research labs, including Bhabha Atomic Research Centre (BARC), in India. The passive autocatalytic recombiner (PAR) is one of such hydrogen mitigating device consisting of catalyst surfaces arranged in an open-ended enclosure. In the plate type recombiner design sheets made of stainless steel and coated with platinum catalyst material are arranged in parallel inside a flow channel. The catalyst elements are exposed to a constant flow of a mixture of air, hydrogen and steam, a catalytic reaction occurs spontaneously at the catalyst surfaces and the heat of reaction produces natural convection flow through the enclosure. Numerical simulation and experiments are required for an in-depth knowledge of such plate type PAR. Specific finite volume based in-house 2D computational fluid dynamics (CFD) code has been developed to model and analyse the working of these recombiners and has been used to simulate one literature quoted experiment. The validation results were in good agreement against literature quoted German REKO experiments. Parametric study has been performed for particular recombiner geometry for various inlet conditions. Salient features of the simplified CFD model developed at BARC and results of the present model calculations are presented in this paper. (orig.)

  4. Full-chip correction of implant layer accounting for underlying topography

    Science.gov (United States)

    Oh, Minchul; Youn, Hyungjoo; Chung, Noyoung; Maeng, Jaeyeol; Lee, Sukjoo; Ku, Jahum; Dave, Aasutosh; Sturtevant, John L.; Hollerbach, Uwe; Do, Thuy; Granik, Yuri; Adam, Kostas; Kim, Juhwan; Zhu, Cynthia; Jung, S. W.

    2012-03-01

    Photolithography for the formerly "non-critical" implant blocking layers is becoming more challenging as edge placement control budgets for junction definition shrink with each node. In addition to the traditional proximity effects associated with the implant layer mask, the underlying active and gate layers can interact through a variety of mechanisms to influence the edge placement of the developed implant layer. These mechanisms include bulk reflectivity differences, resist thickness thin film interference effects, reflective notching from pattern sidewalls, reflections from curved surfaces, focus differences, and more. While the use of organic developable bottom antireflection coating (dBARC) can be effective in minimizing these influences, it does represent an added complexity and cost, and processes are still relatively immature. Without such a dBARC, the CD variation due to underlying layers can easily exceed 50 nm, or more than 25% of the target dimension. We propose here a framework for modeling and correcting for these underlayer effects. The approach is based upon calibration of an optical model representing only implant mask proximity effects and two additional optical models which represent the effects of the underlayer topography. Such an approach can be effective in delivering much improved CD control for complex layouts, and represents only a small impact to full-chip correction runtime.

  5. Annual report 1989

    International Nuclear Information System (INIS)

    The main thrust of various research and development activities of the Bhabha Atomic Research Centre (BARC) is directed towards: (1) supporting nuclear power programme in all its aspects which include design of nuclear reactors, development of nuclear fuel and materials, and management of nuclear waste, (ii) producing radioisotopes and promoting their applications in agriculture, medicine and industries, and (iii) providing research and development and service backup to ensure health and radiation protection in nuclear facilities. BARC also carries out R and D work in frontier areas of science like plasma and fusion physics, accelerators and lasers, high temperature superconductivity, condensed mater physics, high pressure physics, high resolution spectroscopy, chemical reaction dynamics, laser induced chemistry, electronics, robotics, radiation biology, and genetic engineering. These R and D activities during 1989 are described in brief in the chapters entitled: Physical Sciences, Chemical Sciences, Materials and Materials Sciences, Radioisotopes, Reactors, Fuel Cycle, Radiological Safety and Protection, Electronics and Instrumentation, Engineering Services, and Life Sciences. The last chapter entitled General describes the supporting activities like technical information services, industrial safety etc. At the end of each chapter, a list of publications during the year by scientists of the Centre in the corresponding field is given. (M.G.B.)

  6. Embedded CAMAC controller: hardware/software co-optimization for high throughput

    International Nuclear Information System (INIS)

    Advances in technology have resulted in availability of low-power, low form-factor embedded PC based modules. The Embedded CAMAC Controller (ECCS) is designed with ETX (Embedded Technology eXtended) standard Single Board Computer (SBC) having PC architecture with Ethernet connectivity. The paper highlights the software and hardware design optimizations to meet high throughput requirements of multi-parameter experiments and scan mode accelerator control applications. The QNX based software is designed for high throughput by adopting design strategies like multi-threaded architecture, interrupt-driven data transfer, buffer pool for burst data, zero memory copy, lockless primitives and batched event data transfer to host. The data buffer and all control logic for CAMAC cycle sequencing for LIST mode is implemented entirely in hardware in Field Programmable Gate Array (FPGA). Through this design, sustained throughput of 1.5 MBps has been achieved. Also, the host connectivity through Ethernet link enables support for multi-crate configuration, thus providing scalability. The ECC has been installed for accelerator control at FOTIA BARC, Pelletron and LINAC-Pelletron, TIFR and for multiparameter experiments at NPD, BARC. (author)

  7. Draft report on the national seminar in nuclear medicine

    International Nuclear Information System (INIS)

    The proceedings of the seminar on nuclear medicine have been conducted in four main sessions. In the first session a review of the current status of clinical nuclear medicine in India is reviewed. The use of radioisotopes in thyroid function studies, central nervous systems, liver disorders, lung and bone imaging, renal function studies, dynamic function studies, gastroenterology haematology etc. are described. The existing facilities and the future needs for radioimmunoassay and radiotherapy are discussed. In Session 2, the existing facilities in nuclear medicine in different states in India are reviewed. In Session 3, the available resources in nuclear medicine are reviewed. Radiation protection procedures are outlined. Various nuclear instruments developed at the Bhabha Atomic Research Centre, (BARC), Bombay, for use in nuclear medicine are briefly described. A list of radiopharmaceuticals developed by BARC and in current use, is given. The roles of the physicist, pharmacist and the nuclear medicine technologist in the hospitals having nuclear medicine units, are stressed. The importance of training and education for personnel in nuclear medicine and medical physics is pointed out. (A.K.)

  8. Spectroscopy Division : Progress report for Oct 1979 - Dec 1980

    International Nuclear Information System (INIS)

    An account of the activities, with an individual summary of each, of the Spectroscopy Division of the Bhabha Atomic Research Centre (BARC), Bombay, for the period from October 1979 to December 1980 is given. The activities of the Division are mainly concerned with: (1) spectrochemical analysis of nuclear fuels, reactor materials, mineral samples, environmental samples, biological samples, and other samples by methods of optical emission spectroscopy, electron spectroscopy, and X-ray fluorescence spectroscopy, (2) research and development primarily in the field of high resolution atomic and molecular spectroscopy, and (3) design and fabrication of high precision optical instruments and electronic components for other Divisions of BARC and other constituent units of the Department of Atomic Energy. During the report period, the following were fabricated: a monochromator using a concave holographic grating, a holographic grating spectrograph, a core viewing system for the Fast Breeder Test Reactor now under construction at Kalpakkam, a critical angle refractometer for heavy water analysis in the Rajasthan Atomic Power Station, electronic equipment like frequency divider amplifier, lock-in-voltmeter, analog ratio meter etc. required for laser spectroscopy. Lists of the staff members, their publications during the report period, educational and training activities of the Division are also given. Two feature articles, one dealing with beam foil spectroscopy and the other with monochromatization of synchrotron radiation, are also included. (M.G.B.)

  9. Post-fire Gully Rejuvenation - Evidence of Process Thresholds Controlled by Vegetation Disturbance

    Science.gov (United States)

    Hyde, K.; Woods, S.

    2011-12-01

    High intensity rainfall may trigger gully rejuvenation on hillslopes recently disturbed by wildfire, leading to debris-laden flows which generally contribute the majority of sediment transported in post-fire erosion events. We investigated the extent to which the occurrence of gully rejuvenation can be predicted based upon burn severity, rainfall data and basin morphometric variables. Field surveys were conducted at six Northern Rockies sites to identify occurrence of gully rejuvenation in first order catchments and to map and characterize the location of gully heads. NEXRAD and rain gage data analysis coupled with field observations characterized rainfall intensity and extent. Building on previous work we quantified burn severity using the Vegetation Disturbance Index (VDI), a continuous metric based upon Burned Area Reflectance Classification (BARC) maps derived from satellite imagery using the dNBR algorithm. GIS analysis combined the VDI with morphometric factors expected to influence hillslope stability. Gully heads marked abrupt transition in channel form. Above gully heads, channels were shallow and U-shaped with gentle transition to the hillslope and fine root hairs intact. Angular edges marked deep gully head incisions which down-cut channel floors from 0.2-0.3 to 1.0 meter or more. Any remaining roots were coarse and the hillslope transition was sharp. Gully heads were located at variable distances below the master rill head of the catchment hollow. Distances were obviously greater where live canopy remained upslope. Gully head morphology strongly suggests flow force transition and exceedance of an erosion process threshold. The variable distance of the gully head below the hollow suggest upslope controls influencing initiation point, possibly degree and spatial pattern of burn severity. Binary logistic regression revealed stronger correlation between gully rejuvenation and VDI than morphometric variables. The statistical strength using the continuous

  10. Accelerator development in India for ADS programme

    Indian Academy of Sciences (India)

    P Singh; S V L S Rao; Rajni Pande; T Basak; Shwetha Roy; M Aslam; P Jain; S C L Srivastava; Rajesh Kumar; P K Nema; S Kailas; V C Sahni

    2007-02-01

    At BARC, development of a Low Energy High Intensity Proton Accelerator (LEHIPA), as front-end injector of the 1 GeV accelerator for the ADS programme, has been initiated. The major components of LEHIPA (20 MeV, 30 mA) are a 50 keV ECR ion source, a 3 MeV Radio Frequency Quadrupole (RFQ) and a 20 MeV drift tube linac (DTL). The Low Energy Beam Transport (LEBT) and Medium Energy Beam Transport (MEBT) lines match the beam from the ion source to RFQ and from RFQ to DTL respectively. Design of these systems has been completed and fabrication of their prototypes has started. Physics studies of the 20{1000 MeV part of the Linac are also in progress. In this paper, the present status of this project is presented.

  11. Single vial kit formulation for preparation of PET radiopharmaceutical: 68Ga-DOTATOC

    International Nuclear Information System (INIS)

    The aim of the study was to establish a cost effective and facile method for preparation of clinical grade 68Ga-DOTATOC for PET imaging of neuroendocrine tumors. Kit for peptide conjugate, DOTATOC was formulated under sterile conditions. Radiolabeling with 68Ga eluted from novel 68Ge/68Ga BARC generator was optimized and complex was characterized by PC and HPLC. Consistency in 68Ga labeling using kit vials was achieved when tested up to three months. Pharmacokinetics of 68Ga-DOTATOC was studied in small animals. Fast clearance of activity via renal route as reported for 68Ga-DOTATOC peptide was observed. Clinical application of 68Ga-DOTATOC was also demonstrated. (author)

  12. Overview of plant dosimetry in agricultural commodities

    International Nuclear Information System (INIS)

    Extensive research carried out for more than three decades at Bhabha Atomic Research Centre, Bombay and other laboratories in India had conclusively established application of radiation processing of food for catering to the domestic and export market. A major milestone of food irradiation was reached in the country when Board of Radiation and Isotope Technology, a constituent unit of Department of Atomic Energy had set up 'SPICE PLANT' at Vashi, Navi Mumbai in the year 2000. It was first demonstration plant for radiation processing of spices for hygienisation purpose. For expanding scope of applications in agricultural sector, the next step in this direction was taken by BARC for setting up 'KRUSHAK' plant at Lasalgaon, Nashik. This was the first plant for low dose application of gamma radiation in agricultural commodities i.e. for sprout inhibition in onion and potatoes

  13. Report on R and D activities of Health Physics Division 1990-1993

    International Nuclear Information System (INIS)

    This report is a compilation of various R and D programmes undertaken, continued and/or completed by Health Physics Division of Bhabha Atomic Research Centre (BARC) during the period 1990-1993. The findings and results of several types of investigations on topics ranging from environmental studies, radiation dosimetry - internal and external, operational health physics, site evaluation studies, micrometeorology, instrumentation and techniques and industrial hygiene and safety are presented in the form of abstracts. The abstracts have been arranged subject wise. References to the scientific papers and technical reports published or presented have been included. Also included are extracts from IAEA Research Agreements and theses submitted for the award of M.Sc./Ph.D. degrees by research by the staff members of the Division. (author). appendix

  14. Ratchetting failure of the piping components subjected to seismic loading- experimental and numerical studies

    International Nuclear Information System (INIS)

    Strain accumulation induced by cyclic loading, i.e., ratchetting is important in designing structural components. It can reduce the fatigue life or can cause failure of piping components or systems subjected to seismic or other cyclic loads. The 1995 ASME B and PV code, Section III; has been modified to incorporate reverse dynamic loading and ratchetting. In the present investigation ANSYS software package, which incorporates Chaboche kinematic hardening model, was used to study the ratchetting. The basic features of Chaboche model and the determination of the parameters for the model have been discussed in this paper. Two sets of experimental data namely viz. (a) three point and four point bending test on straight pipe (b) shake table test on pipe elbow system, performed by BARC were used for validating ANSYS results. ANSYS over predicts ratchetting compared to the experimental values. (author)

  15. Design and development of a 6 MW peak, 24 kW average power S-band klystron

    International Nuclear Information System (INIS)

    A 6 MW peak, 24 kW average power S-band Klystron is under development at CEERI, Pilani under an MoU between BARC and CEERI. The design of the klystron has been completed. The electron gun has been designed using TRAK and MAGIC codes. RF cavities have been designed using HFSS and CST Microwave Studio while the complete beam wave interaction simulation has been done using MAGIC code. The thermal design of collector and RF window has been done using ANSYS code. A Gun Collector Test Module (GCTM) was developed before making actual klystron to validate gun perveance and thermal design of collector. A high voltage solid state pulsed modulator has been installed for performance valuation of the tube. The paper will cover the design aspects of the tube and experimental test results of GCTM and klystron. (author)

  16. Sustained performance of 8 MeV Microtron

    International Nuclear Information System (INIS)

    Energetic electrons and intense bremsstrahlung radiation from 8 MeV Microtron are being utilized in variety of collaborative research programs in radiation physics and allied sciences involving premier institutions of the country and sister universities of the region. The first of its kind electron accelerator in the country, set up at Mangalore University in collaboration with RRCAT Indore and BARC Mumbai, has been facilitating researchers since its inception with its inherent simplicity, ease of construction, low cost and excellent beam quality. A bird's eye view on the reliable aspects of the machine, efforts behind the continuous operation of the accelerator and important applications of the accelerator in physical and biological sciences are presented in this paper.

  17. 小滨麦易位系山农6343抗白粉病基因的分子标记定位%Powdery Mildew Res istant Locus in Tritileymus Translocation Line Shannong6343 Mapped by Molecular Markers

    Institute of Scientific and Technical Information of China (English)

    徐金秋; 何方; 崔法; 亓晓蕾; 余利; 赵春华; 王洪刚

    2012-01-01

    本研究通过抗性接种鉴定对从普通小麦品种烟农15与八倍体小滨麦杂交后代中选育的抗白粉病小滨麦易位系山农6343的白粉病抗性遗传特点进行了分析,结果表明,山农6343的白粉病抗性由显性单基因控制,暂将其命名为PmSn6343(t);利用辉县红与山农6343杂交构建了包含302个家系的F2分离群体,对其进行白粉病抗性基因分子标记的连锁分析和染色体定位.在分析的1 980对SSR、EST-SSR和STS引物中,有403对基因组SSR引物可在亲本间揭示多态性差异,其中Wmc658和Barc 122两个引物在优选小群体中可以扩增出多态性谱带;采用F2群体对两个标记进行连锁分析证明Wmc658和Barc 122与山农6343抗白粉病基因PmSn6343(t)的连锁距离分别为3.4 cM和5.4 cM,并将抗白粉病基因定位在染色体2AL上.利用F2∶3家系对两个标记进行验证,结果表明,两个标记是与白粉病抗性基因PmSn6343(t)连锁的可靠分子标记.%In present studies, we analyzed the genetic characteristics of powdery mildew resistant locus in Tritileymus Translocation line Shannong6343 that was derived from the offspring of a cross between the common wheat cultivar Yannong15 and octoploid Tritileymus, the results demonstrated that the powdery mildew resistant locus in Shannong6343 was a single dominant locus based on the phenotypic data from artificial inoculation, tentative named the locus as PmSn6343(t). In order to figure out the linkage relationship and chromosome location of powdery mildew resistant locus in Shannong6343, an F2 segregating population with 302 individuals derived from the cross between Huixianhong and Shannong6343 was employed to be genotyped by the molecular markers of SSR, EST-SSR and STS. 403 pairs of SSR markers from the tested 1 980 markers of SSR, EST-SSR and EST were identified to be polymorphisms between the two parents, of which two SSR markers, Wmc658 and Barc 122, can generate polymorphisms in the

  18. Synthesis and structure of new framework phosphates Li1/4M7/4(PO4)3(M = Nb, Ta)

    International Nuclear Information System (INIS)

    New lithium-niobium and lithium-tantalum phosphates Li1/4M7/4(PO4)3(M = Nb, Ta) are synthesized by the solid-phase method. The compounds prepared are characterized using electron microprobe analysis, X-ray powder diffraction, and IR spectroscopy. The crystal structure of the Li1/4Ta7/4(PO4)3 phosphate is determined from the X-ray powder diffraction data (the Rietveld method) and belongs to the framework type. The framework of the structure consists of TaO6 and LiO6 vertex-shared octahedra and PO4 tetrahedra. The isostructural phosphates Li1/4M7/4(PO4)3 crystallize in the trigonal crystal system (space group R3-barc, Z = 6) and belong to the NaZr2(PO4)3 structure type.

  19. Combustion synthesis and preliminary luminescence studies of LiBaPO4 : Tb3+ phosphor

    Indian Academy of Sciences (India)

    C B Palan; N S Bajaj; A Soni; M S Kulkarni; S K Omanwar

    2015-10-01

    The polycrystalline sample of LiBaPO4 : Tb3+ (LBPT) was successfully synthesized by solution combustion synthesis and studied for its luminescence characteristics. The thermoluminescence (TL) glow curve of LBPT material consists of two peaks at 204.54 and 251.21°C. The optimum concentration was 0.005 mol to obtain the higher TL intensity compared to commercial TLD-100 phosphor. The peak shape method was used to calculate kinetic parameter (activation energy and frequency factor). In CW-OSL mode its sensitivity for beta exposure was found to be 50% compared to commercially available -Al2O3 : C and 40% than LMP (BARC), and photoluminescence spectrum of LBPT shows green emission when excited with 225 nm UV source.

  20. APMP comparison for the calibration of ambient dose equivalent meters in ISO neutron reference fields - APMRRI(III)-S1

    International Nuclear Information System (INIS)

    The comparison for the calibration of ambient dose equivalent meter was organized by TCRI of APMP. Seven laboratories (ARPANSA, BARC, INER, KRISS, NIM, NMIJ, and VNIIM) were participated in the comparison exercise. Two moderator-type neutron ambient dose equivalent meters (one is cylindrical and the other is spherical) were circulated and calibrated in ISO standard neutron fields of 252Cf, 241Am-Be, and D2O moderated 252Cf sources. The stability of the transfer instruments was checked by the pilot lab (KRISS) between the measurements of two successive participants. Some outliers exist in each measurement set and the weighted means of ail measurement results are not adequate as a reference value because of the large chi-square values. The median was used to calculate the reference value. (authors)

  1. Networked National Occupational Dose Registry System (NODRS)

    International Nuclear Information System (INIS)

    Recording of occupational doses received by radiation workers during their working life is a mandatory aspect of radiation protection. Maintaining of life-time dose data of these radiation workers is also necessary for (i) ensuring and reviewing radiation safety of workers, (ii) certification and other legal purposes, and (iii) for statistical analysis and epidemiological studies. Centralized dose records are being maintained by BARC since the inception of Directorate of Radiation Protection in late sixties. The dose records were computerized since 1975 and the systems were upgraded from time to time. The requirement of personnel data information was made a pre-requisite for allotment of personnel number to new persons for TLD Badge services since 1992

  2. Out-of-pile thermophysical properties of metallic fuel for fast reactors in India

    International Nuclear Information System (INIS)

    Metallic fuel with designs based on a) sodium bonded ternary and b) mechanical bonded binary fuel are being considered for future fast reactors in India. Work has been initiated encompassing various aspects e.g. fabrication of the sodium/ mechanical bonded fuel pin, studies on out-of-pile thermo-physical and thermodynamics properties of fuel alloys, fuel-clad chemical compatibility etc. Laboratory scale fabrication of U-15Pu and U-15Pu- 6Zr has been carried out and test irradiation is planned. This presentation shared the experience on the evaluation of thermophysical properties and fuel-clad chemical compatibility studies for U-6Zr and U-15Pu, at BARC, India

  3. Use of radiation in grain legume improvement at Bhabha Atomic Research Centre

    International Nuclear Information System (INIS)

    Pulses are the cheapest source of protein for the predominantly vegetarian population of India. However per capita availability of pulses is reduced due to high growth of population and only marginal increase in pulses production. Development of varieties resistant to biotic and abiotic stresses will help to increase and stabilize pulse production in the country. Research work for the improvement of the three important pulse crops namely pigeon pea, mungbean and black gram was initiated using induced mutation approaches in early 70' and recently for cowpea and soybean at the Nuclear Agriculture and Biotechnology Division of the Bhabha Atomic Research Centre, Mumbai. The programme for developing disease resistant high yielding varieties is being pursued at NABTD, BARC using induced mutations and conventional breeding approaches

  4. Performance evaluation of a thermosyphon heat transport device using CFD

    International Nuclear Information System (INIS)

    Study of the heat transfer characteristics of a Thermosyphon heat transport device, which can be employed for passive heat transfer, is taken up in the present paper. In the present work, a thermosyphon heat transport device designed at BARC is being considered for its performance evaluation. A CFD model was prepared and parametric studies have been conducted to determine the heat transport capacity of the device. Different parameters considered for parametric studies are hot fluid temperature, heated length and sleeve length. The frictional pressure drop inside the device is calculated empirically also and validated against the CFD results. The paper presents the results of the studies carried out with Lead-Bismuth eutectic as the working fluid. (author)

  5. Laser pulse heating of nuclear fuels for simulation of reactor power transients

    Indian Academy of Sciences (India)

    C S Viswanadham; K C Sahoo; T R G Kutty; K B Khan; V P Jathar; S Anantharaman; Arun Kumar; G K Dey

    2010-12-01

    It is important to study the behaviour of nuclear fuels under transient heating conditions from the point of view of nuclear safety. To simulate the transient heating conditions occurring in the known reactor accidents like loss of coolant accident (LOCA) and reactivity initiated accident (RIA), a laser pulse heating system is under development at BARC, Mumbai. As a prelude to work on irradiated nuclear fuel specimens, pilot studies on unirradiated UO2 fuel specimens were carried out. A laser pulse was used to heat specimens of UO2 held inside a chamber with an optically transparent glass window. Later, these specimens were analysed by metallography and X-ray diffraction. This paper describes the results of these studies.

  6. Enhancement of genetic diversity in soybean (Glycine max (L.) Merril) through mutation techniques

    International Nuclear Information System (INIS)

    Soybean (Glycine max (L.) Merril) is one of the important oilseed crops of India. It shares nearly 37 percent of the total oil seeds produced in India and is cultivated over an estimated area of 8.87 million hectares with a production of around 9.46 million tonnes. A vast amount of genetic variability, of both quantitative and qualitative traits, has been generated through experimental mutagenesis. Two soybean varieties TAMS-38 and TAMS 98-21 have been developed and released for commercial cultivation by Bhabha Atomic Research Centre (BARC). Both the varieties are becoming popular among the farmers in Vidarbha region of Maharashtra and were cultivated in more than 1 lakh hectares during the year 2006-2007. In this paper the role of mutation breeding in soybean improvement has been discussed. (author)

  7. Production of gaseous radiotracers for industrial applications.

    Science.gov (United States)

    Sharma, V K; Pant, H J; Goswami, Sunil; Jagadeesan, K C; Anand, S; Chitra, S; Rana, Y S; Sharma, Archana; Singh, Tej; Gujar, H G; Dash, Ashutosh

    2016-10-01

    This paper describes prerequisite tests, analysis and the procedure for irradiation of gaseous targets and production of gaseous radioisotopes i.e. argon-41 ((41)Ar) and krypton-79 ((79)Kr) in a 100MWTh DHRUVA reactor located at Bhabha Atomic Research Center (BARC), Trombay, Mumbai, India. The produced radioisotopes will be used as radiotracers for tracing gas phase in industrial process systems. Various details and prequalification tests required for irradiation of gaseous targets are discussed. The procedure for regular production of (41)Ar and (79)Kr, and assay of their activity were standardized. Theoretically estimated and experimentally produced amounts of activities of the two radioisotopes, irradiated at identical conditions, were compared and found to be in good agreement. Based on the various tests, radiological safety analysis and standardization of the irradiation procedure, necessary approval was obtained from the competent reactor operating and safety authorities for regular production of gaseous radiotracers in DHRUVA reactor. PMID:27518216

  8. 1D Josephson quantum interference grids: diffraction patterns and dynamics

    Science.gov (United States)

    Lucci, M.; Badoni, D.; Corato, V.; Merlo, V.; Ottaviani, I.; Salina, G.; Cirillo, M.; Ustinov, A. V.; Winkler, D.

    2016-02-01

    We investigate the magnetic response of transmission lines with embedded Josephson junctions and thus generating a 1D underdamped array. The measured multi-junction interference patterns are compared with the theoretical predictions for Josephson supercurrent modulations when an external magnetic field couples both to the inter-junction loops and to the junctions themselves. The results provide a striking example of the analogy between Josephson phase modulation and 1D optical diffraction grid. The Fiske resonances in the current-voltage characteristics with voltage spacing {Φ0}≤ft(\\frac{{\\bar{c}}}{2L}\\right) , where L is the total physical length of the array, {Φ0} the magnetic flux quantum and \\bar{c} the speed of light in the transmission line, demonstrate that the discrete line supports stable dynamic patterns generated by the ac Josephson effect interacting with the cavity modes of the line.

  9. Annual report of the Department of Atomic Energy, 1976-77

    International Nuclear Information System (INIS)

    Research and development work in various research units, and activities and achievements of various public undertakings of the Department of Atomic Energy, India, during 1976-77 are reported. Construction of the 100 MW-thermal research reactor at Trombay and the Fast Breeder Test Reactor at Kalpakkam is in progress. Work on desalination, MHD and in seismology in continued. Report on performance of the Tarapur and Rajasthan Atomic Power Stations and progress of construction of the nuclear power stations at Kalpakkam and Narora is given. Fuelling machine carriage and shielding and plug assemblies for the second unit of the Rajasthan Atomic Power Station have been indigenously fabricated. A novel technique for prospecting nuclear minerals, termed as BARC-TEFUREX has been evolved and is being used successfully. The country-wide radiological protection programme covers 42,000 radiation workers in 2,280 institutions. (M.G.B.)

  10. Development of vitrification technology in India for immobilization of high-level radioactive liquid waste

    International Nuclear Information System (INIS)

    The work on development of vitreous matrices started in early sixties in the country after proper understanding of demands on product and process. The development studies in collaboration with Central Glass and Ceramic Research Institute (CGCRI), Kolkata were initiated in 1965 and continued till 1975. Leaching of developed glass system in distilled water was studied along with the influence of heat treatment on chemical durability of waste products. The results obtained during this historical work were very useful in selection of a glass composition as per the need of melting temperature and % waste incorporation. Work in BARC laboratories at Trombay and Tarapur were continued for characterization of VWP samples after leaching, heat treatment, sputtering and as such specimen using SEM, XRD etc.

  11. Development of indigenous industrial electron accelerators as sources for advanced material processing

    International Nuclear Information System (INIS)

    Over the last few decades, the electron beams have brought in a revolutionary change in the area of advanced material processing. Beams varying from a few hundred keV to a ten of MeV and powers from a few hundred watts to a few hundred kW, have been employed for this purpose. Right from curing of coatings and adhesives to the cross linking of cables, sterilization of medical products and treatment of sewage, all are being addressed through the electron beams. Realising the enormous potential of these beams, BARC has initiated an indigenous programme in this direction. Two DC accelerators having ratings as 0.5 MeV/10kW, 3 MeV/30 kW and an RF linac of 10 MeV/10 kW, are being developed indigenously for this purpose. This article gives a brief account of this programme. (author)

  12. 异型吧凳

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    有没有一张轻巧的酒吧凳让人感觉一点也不歪斜呢?该款“Hod”就是这样的产品。它是由Azuamoline为MobLes 114 BarceLona设计的酒吧凳.座位前倾能使用户处于交流的最佳姿态.且整体的脚凳能使用户保持适当的身体轴线。它采用旋转模塑的聚乙烯塑料制成.既适用于室内也适合室外.高度为87.63厘米(34.5英寸)。凳子提供红色、白色、青绿、

  13. 2$\\pi$ proportional counting chamber for large-area-coated $\\beta$ sources

    Indian Academy of Sciences (India)

    DESAI SHRADDHA S

    2016-06-01

    Detection system for measuring absolute emission rate from large-area-coated $\\beta$ sources has been indigenously developed. The system consists of a multiwire-based proportional counter with gas flow and a source mounted within the sensitive volume of the detector. Design of the counter enables efficient counting of emissions in $2\\pi$ solid angle.A provision is made for change ofthe source and immediate measurement of source activity. These sources are used to calibrate the efficiency of contamination monitors at radiological facilities. Sensitive area of the detector covers 165◦ solid angle nearing $2\\pi$ of emission from the source of size $100 \\times 150$ mm. Performance of the chamber is tested using collimated $^{55}$Fe X-ray source and $^{90}$Sr / $^{90}$Y coated $\\beta$ sources of various activities. The activity measurement system is established as a national primary standard for calibration of coated $\\beta$ sources at Radiological Laboratory at BARC. Design and performanceof the chamber are presented.

  14. Instrumentation for PSD-based neutron diffractometers at Dhruva reactor

    Indian Academy of Sciences (India)

    S S Pande; S P Borkar; S Prafulla; V D Srivastava; A Behare; P K Mukhopadhyay; M D Ghodgaonkar; S K Kataria

    2004-08-01

    Linear position sensitive detectors (PSDs) are widely used to configure neutron diffractometers and other instruments. Necessary front-end electronics and a data acquisition system [1] is developed to cater to such instruments built around the Dhruva research reactor in BARC. These include three diffractometers with multiple PSDs and four with single PSD. The front-end electronics consists of high voltage units, preamplifiers [2], shaping amplifiers, ratio ADCs (RDC) [3]. The data acquisition system consists of an interface card and software. Commercially available hardware like temperature controller or stepper motor controller connected over GPIB or RS232 are also integrated in the data acquisition system. The data acquisition is automated so that it can continue unattended for control parameter like temperature, thus enabling optimum utilization of available beam time. The instrumentation is scalable and can be easily configured for various instrumental requirements. The front-end electronics and the data acquisition system are described here.

  15. Annual report 2005-2006

    International Nuclear Information System (INIS)

    Research and development and other activities of the various constituent units of Department of Atomic Energy (DAE) and also of the institution aided by DAE for the year 2005-2006 are reported. The various constituents units of DAE consist of nuclear research centres, nuclear power stations, fuel reprocessing and heavy water plants, nuclear fuel fabrication facilities, electronic and instrumentation production organisations, atomic mineral processing units and other nuclear installations. The activities of DAE cover the whole gamut of nuclear fuel cycle, research and development in nuclear science and reactor technology, applications of radiation and radioisotopes, radiation protection, research and development in front line areas such as robotics, lasers, mathematics and computational sciences. International research collaborations like CERN-DAE collaboration were completed by BARC. These activities are described broadly under: executive summary, nuclear power programme, radiation technologies and applications, basic research, research education linkage, technology transfer, and collaborative programmes, infrastructure, public sector undertakings and other activities

  16. Annual report 2004-2005

    International Nuclear Information System (INIS)

    Research and development and other activities of the various constituent units of Department of Atomic Energy (DAE) and also of the institution aided by DAE for the year 2004-2005 are reported. The various constituents units of DAE consist of nuclear research centres, nuclear power stations, fuel reprocessing and heavy water plants, nuclear fuel fabrication facilities, electronic and instrumentation production organisations, atomic mineral processing units and other nuclear installations. The activities of DAE cover the whole gamut of nuclear fuel cycle, research and development in nuclear science and reactor technology, applications of radiation and radioisotopes, radiation protection, research and development in front line areas such as robotics, lasers, mathematics and computational sciences. International research collaborations like CERN-DAE collaboration were completed by BARC. These activities are described broadly under: executive summary, nuclear power programme, radiation technologies and applications, basic research, research education linkage, technology transfer, and collaborative programmes, infrastructure, public sector undertakings and other activities

  17. ENSTAR detector for -mesic studies

    Indian Academy of Sciences (India)

    A Chatterjee; B J Roy; V Jha; P Shukla; H Machnder; GEM Collaboration

    2006-05-01

    We have initiated a search for a new type of nuclear matter, the -mesic nucleus, using beams from the multi-GeV hadron facility, COSY at Juelich, Germany. A large acceptance scintillator detector, ENSTAR has been designed and built at BARC, Mumbai and fully assembled and tested at COSY. A test run for calibration and evaluation has been completed. In this contribution we present the design and technical details of the ENSTAR detector and how it will be used to detect protons and pions (the decay products of -mesic bound state). The detector is made of plastic scintillators arranged in three concentric cylindrical layers. The readout of the detectors is by means of optical fibres. The layers are used to generate - spectra for particle identification and total energy information of stopped particles. The granularity of the detector allows for position ( and ) determination making the event reconstruction kinematically complete.

  18. Role of near threshold resonances in intermediate energy nuclear physics

    Indian Academy of Sciences (India)

    B K Jain; N J Upadhyay

    2014-11-01

    The presence of a resonance close to the threshold strongly effects the dynamics of the interacting particles at low energies. Production of 12C, the element for life, in 4He burning in Sun is a classic example of such a situation. In intermediate energy nuclear physics, this situation arises in the interactions of an -meson with a nucleon and that of a −-meson with a proton at low energies, where both these systems have a resonance or a bound state near their thresholds, resulting in a strong attractive interaction. If putting these mesons in nuclear environment produces a strong attraction, it is possible that, in nature there may exist - and −-nuclear bound states. Such a tantalizing possibility has led to experimental and theoretical programmes to search for them. These efforts have produced positive results. This paper gives a brief critical overview of these studies, emphasizing especially the efforts led by Bhabha Atomic Research Centre (BARC).

  19. Programmable logic controller (PLC) for safety systems of nuclear plants

    International Nuclear Information System (INIS)

    Full text: A programmable logic controller (PLC) has been developed by RCnD, BARC for use in the safety critical systems in nuclear power plants. This PLC uses qualified hardware developed in RCnD for use in NPP. The programming software conforms to IEC-61131 part 3. The application programming is done on function block diagram (FBD) editor and the FBD is automatically converted into code in high level language (C / C++). This feature makes the application easily decipherable and therefore easily subjected to reviews and other validation techniques. The key to make quality software for use in nuclear systems is to enforce various standards in the design and development of the software, something, which is not possible to do with a commercially available PLC. This PLC with its software completely transparent lends itself to rigorous verification and validation easily

  20. Application of vacuum technology during nuclear fuel fabrication, inspection and characterization

    International Nuclear Information System (INIS)

    Full text: Vacuum technology plays very important role during various stages of fabrication, inspection and characterization of U, Pu based nuclear fuels. Controlled vacuum is needed for melting and casting of U, Pu based alloys, picture framing of the fuel meat for plate type fuel fabrication, carbothermic reduction for synthesis of (U-Pu) mixed carbide powder, dewaxing of green ceramic fuel pellets, degassing of sintered pellets and encapsulation of fuel pellets inside clad tube. Application of vacuum technology is also important during inspection and characterization of fuel materials and fuel pins by way of XRF and XRD analysis, Mass spectrometer Helium leak detection etc. A novel method of low temperature sintering of UO2 developed at BARC using controlled vacuum as sintering atmosphere has undergone successful irradiation testing in Cirus. The paper will describe various fuel fabrication flow sheets highlighting the stages where vacuum applications are needed

  1. Recent neutron scattering research and development in India

    Indian Academy of Sciences (India)

    S L Chaplot

    2006-07-01

    A national facility for neutron beam research is operated at the research reactor Dhruva at Trombay in India. The research activities involve various nanoscale structural, dynamical and magnetic investigations on materials of scientific interest and technological importance. Thermal neutron has certain special properties that enable, e.g., selective viewing of parts of an organic molecule, hydrogen or water in materials, investigations on minerals and ceramics, and microscopic and mesoscopic characterization of bulk samples. The national facility comprises of eight neutron-scattering spectrometers in the reactor hall, and another four spectrometers in the neutron-guide laboratory. In addition, a neutron radiography facility and a detector development laboratory are located at APSARA reactor. All the instruments including the detectors and electronics have been developed within BARC. A new powder diffractometer (PD-3) is being developed by UGC-DAE-CSR. The national facility is utilized in collaboration with various universities and other institutions.

  2. Folded tandem ion accelerator facility at Trombay

    Indian Academy of Sciences (India)

    P Singh

    2001-08-01

    The folded tandem ion accelerator (FOTIA) project at BARC has been commissioned. The analysed carbon beams of 40 nA(3+) and 25 nA(4+), at terminal voltage of 2.5 MV with N2 + CO2 as insulating gas, were obtained. The beams were characterized by performing the Rutherford back scattering (RBS) on gold, tin and iron targets. The beam energy of 12.5 MeV for 12C4+ was consistent with the terminal voltage of 2.5 MV. The N2 + CO2 mixture is being replaced by SF6 gas in order to achieve 6 MV on the terminal. In this paper, some of the salient features of the FOTIA and its present status are discussed.

  3. Accelerator development in India for ADS programme

    Science.gov (United States)

    Singh, P.; Rao, S. V. L. S.; Pande, Rajni; Basak, T.; Roy, Shweta; Aslam, M.; Jain, P.; Srivastava, S. C. L.; Kumar, Rajesh; Nema, P. K.; Kailas, S.; Sahni, V. C.

    2007-02-01

    At BARC, development of a Low Energy High Intensity Proton Accelerator (LEHIPA), as front-end injector of the 1 GeV accelerator for the ADS programme, has been initiated. The major components of LEHIPA (20 MeV, 30 mA) are a 50 keV ECR ion source, a 3 MeV Radio Frequency Quadrupole (RFQ) and a 20 MeV drift tube linac (DTL). The Low Energy Beam Transport (LEBT) and Medium Energy Beam Transport (MEBT) lines match the beam from the ion source to RFQ and from RFQ to DTL respectively. Design of these systems has been completed and fabrication of their prototypes has started. Physics studies of the 20-1000 MeV part of the Linac are also in progress. In this paper, the present status of this project is presented.

  4. Operating experience of interlock and protection system for 1 MW klystron

    International Nuclear Information System (INIS)

    A Low Energy High Intensity Proton Accelerator is being developed by the B.A.R.C., Mumbai. This project requires a three high power 1 MW, 352.21 MHz klystron systems to feed the power to accelerator cavities. NI based real time (RT) controller based control and interlock system has been developed to control various power supplies and to monitor the status of crucial parameters of the subsystem of klystron. This paper discusses details of an 'Operating experience of Interlock and Protection System for 1 MW klystron Radio Frequency (RF) System of LEHIPA' which includes integration and control of high power DC supplies and other auxiliary systems of Klystron RF System

  5. Comparative study of laminar and turbulent flow model with different operating parameters for radio frequency-inductively coupled plasma torch working at 3  MHz frequency at atmospheric pressure

    International Nuclear Information System (INIS)

    This paper provides 2D comparative study of results obtained using laminar and turbulent flow model for RF (radio frequency) Inductively Coupled Plasma (ICP) torch. The study was done for the RF-ICP torch operating at 50 kW DC power and 3 MHz frequency located at BARC. The numerical modeling for this RF-ICP torch is done using ANSYS software with the developed User Defined Function. A comparative study is done between laminar and turbulent flow model to investigate how temperature and flow fields change when using different operating conditions such as (a) swirl and no swirl velocity for sheath gas flow rate, (b) variation in sheath gas flow rate, and (c) variation in plasma gas flow rate. These studies will be useful for different material processing applications

  6. Performance evaluation of 352.21 MHz, 1 MW klystrons and circulators at high power pulsed test stand at RRCAT

    International Nuclear Information System (INIS)

    A 1 MW pulsed test stand operating at 352.21 MHz was set up at RRCAT for tests and qualification of components and devices for the pulsed proton linac program. The test facility comprises of an indigenously built 100kV solid state bouncer modulator, WR 2300 waveguide system, high power circulator and high power RF load. The test facility has stand alone control system for taking the measurement data. We have used the test stand to qualify the 1 MW CW klystrons and circulators obtained from CERN under DAE CERN Collaboration for use in LEHIPA project of BARC and H- pulsed proton Linac at RRCAT. The present paper describes the test results of the qualifications done on the 1MW klystron and 1MW three port circulators for the LEHIPA project as well as for pulsed proton linac at RRCAT. (author)

  7. Development of thyroid monitoring system for the measurement of 125I

    International Nuclear Information System (INIS)

    Iodine-125 has gained wide acceptance in medical science for diagnosis and therapeutic applications. A considerable number of radiation workers of BARC and BRIT are involved in the production of 125I and preparation of radio immunoassay (RIA) kits to meet medical requirement of the country. A state of the art Thyroid Monitoring System incorporated with 51 mm diameter x 3 mm thick NaI(Tl) detector is developed for in-vivo monitoring of 125I in radiation workers handling this radioisotope. The developed system also has provision to accommodate variable body sizes (child to adult). This paper presents the different aspects of the system and its calibration using IAEA neck phantom for estimation of thyroidal content of 125I. (author)

  8. Honolulu Rail Transit: International Lessons in Linking Form, Design, and Transportation

    CERN Document Server

    Boeing, Geoff

    2016-01-01

    The city of Honolulu, Hawaii is currently planning and developing a new rail transit system. While Honolulu has supportive density and topography for rail transit, questions remain about its ability to effectively integrate urban design and accessibility across the system. Every transit trip begins and ends with a walking trip from origins and to destinations: transportation planning must account for pedestrian safety, comfort, and access. Ildefons Cerda's 19th century utopian plan for Barcelona's Eixample district produced a renowned, livable urban form. The Eixample, with its well-integrated rail transit, serves as a model of urban design, land use, transportation planning, and pedestrian-scaled streets working in synergy to produce accessibility. This study discusses the urban form of Honolulu and the history and planning of its new rail transit system. Then it reviews the history of Cerda's plan for the Eixample and discusses its urban form and performance today. Finally it draws several lessons from Barc...

  9. Modification and alignment of beam line of 10 MeV RF electron beam accelerator

    Energy Technology Data Exchange (ETDEWEB)

    Barnwal, R; Ghodke, S R; Bhattacharjee, D; Kumar, M; Jayaprakash, D; Chindarkar, A R; Mishra, R L; Kumar, M; P, Dixit K; S, Acharya; Barje, S R; Lawangare, N K; C, Saroj P; Nimje, V T; Chandan, S; Tillu, A R; V, Sharma; Chavan, R B [Accelerator and Pulse Power Division, BARC, Mumbai, India-400085 (India); Dolas, S [Centre for Design and Manufacturing, BARC, Mumbai, India-400085 (India); Kulkarni, S Y [SAMEER, IIT Powai campus, Mumbai, India-400076 (India)], E-mail: rajesh_barc47@indiatimes.com (and others)

    2008-05-01

    A 10 MeV, 10 kW RF industrial Electron linac designed and developed at BARC is installed at the Electron Beam Center Kharghar, Navi Mumbai. The entire RF accelerator assembly consists of Electron gun, RF source, RF linac structure, Beam diagnostic chamber, Drift tube, Scanning magnet, Beam sensing aperture, Scan horn, and is spread over two floors at EBC. The paper discusses in detail about the alignment procedure adopted for the equipments of 10 MeV RF beamline. The complete electron beamline will be maintained under ultra high vacuum of the order of 10-7 torr. The paper discusses about the present problem of alignment, measurement technique of alignment, reason for misalignment, possible ways to solve the problem, equipment used for alignment, supports and arrestors, verification of alignment under vacuum.

  10. Modification & alignment of beam line of 10 MeV RF electron beam accelerator

    Science.gov (United States)

    Barnwal, R.; Ghodke, S. R.; Bhattacharjee, D.; Kumar, M.; Jayaprakash, D.; Chindarkar, A. R.; Mishra, R. L.; Dolas, S.; Kulkarni, S. Y.; Kumar, M.; P, Dixit K.; S, Acharya; Barje, S. R.; Lawangare, N. K.; C, Saroj P.; Nimje, V. T.; Chandan, S.; Tillu, A. R.; V, Sharma; Chavan, R. B.; V, Yadav; P, Roychowdhury; Mittal, K. C.; Chakravarthy, D. P.; Ray, A. K.

    2008-05-01

    A 10 MeV, 10 kW RF industrial Electron linac designed and developed at BARC is installed at the Electron Beam Center Kharghar, Navi Mumbai. The entire RF accelerator assembly consists of Electron gun, RF source, RF linac structure, Beam diagnostic chamber, Drift tube, Scanning magnet, Beam sensing aperture, Scan horn, and is spread over two floors at EBC. The paper discusses in detail about the alignment procedure adopted for the equipments of 10 MeV RF beamline. The complete electron beamline will be maintained under ultra high vacuum of the order of 10-7 torr. The paper discusses about the present problem of alignment, measurement technique of alignment, reason for misalignment, possible ways to solve the problem, equipment used for alignment, supports & arrestors, verification of alignment under vacuum

  11. Solid phase separation and ICP-OES/ICP-MS determination of rare earth impurities in nuclear grade uranium oxide

    International Nuclear Information System (INIS)

    A simple, effective and low cost solid phase extraction procedure was standardized for the trace and ultra-trace level determination of rare earth impurities, such as, Ce, Dy, Sm, Gd, Eu, Er etc. which act as neutron poisons, in nuclear grade uranium oxide (U3O8 > 99.9% by weight). The method involves selective separation of these elements as their fluorides with the help of activated charcoal from major uranium matrix followed by determination by ICP-MS and high resolution ICP-OES. The residual uranium content of the solution was <10 μg/mL. The recovery of REEs ranges from 85 to 105%. The method was validated with nuclear grade uranium oxide standards CRM-I to CRM-V (BARC, Mumbai, India) in addition to some synthetic standards. The RSD of the method was ±12% (n = 3). (author)

  12. Radioaerosol imaging of the lung. An IAEA [CRP] group study

    International Nuclear Information System (INIS)

    Nuclear scans, radiography and computed tomography (CT) of the lung make up three pantheonic pillars of the modem imaging diagnosis of pulmonary disorders and the contribution of these modalities to the progress of pulmonology has been immense. However the experiences accumulated during the past decades indicate that, with well-known advantages and drawbacks, not one of these imaging modalities can be perfect by itself alone, and it has become obvious that the individual tests are as much complementary to one another as unique. As a matter of fact, the nuclear lung imagings, that include inhalation scan, perfusion scan, ventilation scan and the most recently developed mucociliary transport and alveolar permeability tests, are very sensitive and efficient in respectively providing graphic information about airway patency and alveolar penetration, vascular patency and distribution pattern, alveolar gas exchange and bronchial epithelial integrity in both normal and pathological conditions. But these tests lack fine morphological information. In contrast, radiography with its extremely high level of resolution that is in the order of 30-100 line pairs/mm compared to 3-5 line/cm of nuclear scan resolution power, suffers from the lack of information about the alveolar gas exchange, pulmonary perfusion and respiratory function. Although incomparable to radiography, the resolution power of CT scan is also much greater than that of nuclear scan, but again this test cannot provide the information regarding function and physiology. The aerosol scan findings in each of these diseases are assessed in the i ht of and validated against chest radiography, conventional X-ray tomography and high resolution CT scan. The chapters in this monograph describe a history of radioaerosol lung imaging, radiopharmaceuticals, generation of aerosols by the BARC and other nebulizers, and pertinent lung physiology and the way how aerosol deposits in lung. The technical and constructional aspects

  13. Quantification of chlorine in zirconium oxide and biological samples by instrumental NAA utilizing PCF of Dhruva reactor

    International Nuclear Information System (INIS)

    Recently studies on chlorine contents in various samples are being pursued due to its corrosive nature. Chlorine present at trace level in various finished products as well as powder is used as a raw material for production of different types of zircaloys used as structural materials in nuclear technology. As a part of quality assurance program, it is necessary to quantify chlorine accurately with suitable and simple technique. In the present work we have applied instrumental neutron activation analysis (INAA) utilizing its short-lived activation product (38Cl, 37 min, 1642 and 2168 keV) for its estimation. Pneumatic Carrier Facility (PCF) of Dhruva reactor, BARC was used sample irradiation of zirconium oxide dry powder, synthetic wax and IAEA RMs 1515 (Apple leaves) and Lichen 336. (author)

  14. Synthesis and luminescence properties of KSrPO4:Eu2+ phosphor for radiation dosimetry

    Science.gov (United States)

    Palan, C. B.; Bajaj, N. S.; Omanwar, S. K.

    2016-05-01

    The KSrPO4:Eu phosphor was synthesized via solid state method. The structural and morphological characterizations were done through XRD (X-ray diffraction) and SEM (Scanning Electronic Microscope). Additionally, the photoluminescence (PL), thermoluminescence (TL) and optically Stimulated luminescence (OSL) properties of powder KSrPO4:Eu were studied. The PL spectra show blue emission under near UV excitation. It was advocated that KSrPO4:Eu phosphor not only show OSL sensitivity (0.47 times) but also gives faster decay in OSL signals than that of Al2O3:C (BARC) phosphor. The TL glow curve consist of two shoulder peaks and the kinetics parameters such as activation energy and frequency factors were determined by using peak shape method and also photoionization cross-sections of prepared phosphor was calculated. The radiation dosimetry properties such as minimum detectable dose (MDD), dose response and reusability were reported.

  15. Behaviour of Structural Materials: India

    International Nuclear Information System (INIS)

    Two buoyancy driven LBE loops have been set up in BARC to study corrosion effects of LBE on candidate structural materials for spallation target module; like SS-316 L, 316 LN, SS-304 L, 9Cr-1Mo etc. The larger loops getting ready would be ~ 7 metre high and its riser and downcomer legs would operate at 5500°C and 4500°C respectively. The buoyancy head is estimated to provide a LBE mass flow rate of 1.7kg/s. The flow velocity around the sample is ~0.6 m/s. Material samples exposed in an already operational smaller corrosion loop were being evaluated by Charpy and Tensile tests after exposing the samples for 2000 hours in the flow with oxygen control. Provision is also being made in this loop to enhance the LBE flow by gas injection

  16. PREFACE: 5th DAE-BRNS Workshop on Hadron Physics (Hadron 2011)

    Science.gov (United States)

    Jyoti Roy, Bidyut; Chatterjee, A.; Kailas, S.

    2012-07-01

    The 5th DAE-BRNS Workshop on Hadron Physics was held at the Bhabha Atomic Research Centre (BARC), Mumbai from 31 October to 4 November 2011. This workshop series, supported by the Board of Research in Nuclear Sciences, Department of Atomic Energy (BRNS, DAE), Govt. of India, began ten years ago with the first one being held at BARC, Mumbai in October 2002. The second one was held at Puri in 2005, organized jointly by Institute of Physics, Bhubneswar and Saha Institute of Nuclear Physics, Kolkata. The 3rd and 4th ones took place, respectively, at Shantineketan in 2006, organized by Visva Bharati University, and at Aligarh in 2008, organized by Aligarh Muslim University, Aligarh. The aim of the present workshop was to bring together the experts and young researchers in the field of hadron physics (both experiment and theory) and to have in-depth discussions on the current research activities in this field. The format of the workshop was: a series of review lectures by various experts from India and abroad, the presentation of advanced research results by researchers in the field, and a review of major experimental programs being planned and pursued in major laboratories in the field of hadron physics, with the aim of providing a platform for the young participants for interaction with their peers. The upcoming international FAIR facility at GSI is a unique future facility for studies of hadron physics in the charm sector and hyper nuclear physics. The Indian hadron physics community is involved in this mega science project and is working with the PANDA collaboration on the development of detectors, simulation and software tools for the hadron physics programme with antiprotons at FAIR. A one-day discussion session was held at this workshop to discuss India-PANDA activities, the current collaboration status and the work plan. This volume presents the workshop proceedings consisting of lectures and seminars which were delivered during the workshop. We are thankful to

  17. DbarD and DD pair production at the LHCb in the parton Reggeization approach

    CERN Document Server

    Karpishkov, A V; Saleev, V A; Shipilova, A V

    2016-01-01

    We study the inclusive DbarD and DD pair production in proton-proton collisions at the LHC at lead- ing order of the parton Reggeization approach endowed with universal scale-depended fragmen- tation functions for c-quark to D-meson and for gluon to D-meson transitions. We have described DbarD and DD distributions in azimuthal angle, as well as transverse momentum, rapidity distance, and invariant mass measured in the region of large rapidity 2 < y < 4 by the LHCb Collabora- tion at the LHC without free parameters. We have used Reggeized amplitudes for the processes RR - gg and RR - c barc which are obtained accordingly to Feynman rules of the L.N. Lipatov effective theory of Reggeized partons, and Kimber-Martin-Ryskin model for unintegrated gluon distribution function in a proton with Martin-Stirling-Thorne-Watt collinear parton distributions as inputs.

  18. Technology for production of shelf stable fruit cubes

    International Nuclear Information System (INIS)

    A technology has been developed for the production of intermediate moisture fruit cubes using a combination of osmotic dehydration and infrared drying. Fruits like pineapple, papaya, mango, banana and apple can be successfully converted into intermediate moisture products in the form of fruit cubes using this technology. The fruit cubes can blend very well as natural nutritious supplements with breakfast cereals and in certain food preparations like ice creams, milk shakes, jellies and custards. The product is microbiologically safe for consumption and can be stored at ambient storage condition for more than six months. This technology is an effective alternative for post harvest processing and preservation of ripened fruits. Fruit jam is an additional by-product generated by the process. This technology has been transferred to TT and CD, BARC

  19. Radiochemistry in India. A saga of five decades

    Energy Technology Data Exchange (ETDEWEB)

    Manchanda, V.K. [BARC, Mumbai (India). Radiochemistry Div.; Sungkyunkwan Univ., Suwon (Korea, Republic of). Dept. of Energy Sciences

    2012-07-01

    Radiochemistry in India essentially blossomed under the auspices of the Department of Atomic Energy (DAE) for the last 55 years or so. Major activities in this area are centred at Bhabha Atomic Research Centre, Mumbai (BARC) and Indira Gandhi Centre for Atomic Research, Kalpakkam (IGCAR). Though there were several centers of excellence which were established by renowned radiochemists during the 1960s at the academic institutions in different parts of the country and nurtured by their close associates during the eighties and nineties, their glamour did not last long and only very few have sustained the challenges presented by social and technological upheaval of last five decades. Board of Research in Nuclear Sciences (BRNS), an organ of DAE has been in the forefront for promotion of education and research in nuclear sciences at academic institutions. It sponsors symposia in Nuclear and Radiochemistry (NUCAR), Nuclear Analytical Chemistry (NAC) and Applications of Radioisotopes in Chemistry, Environment and Biology (ARCEB) which are organized periodically to provide a platform for interaction of the radiochemists within and outside DAE. A professional body, viz. Indian Association of Nuclear Chemists and Allied Scientists (IANCAS), formed in early eighties at BARC, Mumbai has been spearheading the campaign to popularize the subject of radiochemistry in schools and colleges through workshops and publishing monographs and thematic bulletins regularly in the area of interest to the radiochemists. During the last five decades, radiochemistry programme at BARC has centered around attaining excellence in basic research utilizing radiations and radioisotopes to unravel various nuclear and chemical phenomena, related to actinides and fission products. This programme encompassed a number of research and development areas such as nuclear fission, nuclear reactions, nuclear probes for materials study, nuclear and chemical properties of actinides, actinide spectroscopy

  20. Performance evaluation of indigenous thermal ionization mass spectrometer for determination of 235U/238U atom ratios

    International Nuclear Information System (INIS)

    A magnetic sector based Thermal Ionization Mass Spectrometer (TIMS) designed and developed at Technical Physics Division, B.A.R.C., was evaluated for its performance for the determination of 235U/238U atom ratios in uranium samples. This consisted of evaluating the precision and accuracy on the 235U/238U atom ratios in various isotopic reference materials as well as indigenously generated uranium samples. The results obtained by the indigenous TIMS were also compared with those obtained using a commercially available TIMS system. The internal and external precision were found to be around 0.1% for determining 235U/238U atom ratios close to those of natural uranium ( i.e. 0.00730). (author)

  1. Department of Atomic Energy, annual report, 1980-81

    International Nuclear Information System (INIS)

    The annual report of the Department of Atomic Energy (DAE) of the Government of India for the period of the fiscal year 1980-81 surveys the work of DAE, its various constituent units and aided institutions. The main thrust of the DAE's programme in the country is directed towards peaceful uses of atomic energy - primarily for generation of electric power and also for application of radioisotopes and radiation in medicine, agriculture, and industry. The research and development (R and D) activities of the Bhabha Atomic Research Centre (BARC) at Bombay, the major R and D establishment of DAE, in the fields of nuclear physics, solid state physics, chemistry and materials science, isotope and radiation applications, reactor technology and radioactive waste management are described in detail. The R and D activities of the Reactor Research Centre at Kalpakkam and the aided institutions such as the Tata Institute of Fundamental Research and the Tata Memorial Centre, both at Bombay, and the Saha Institute of Nuclear Physics at Calcutta are reviewed in brief. Progress of the MHD project, the heavy water plant projects, the thermal research reactor R-5 project at BARC and nuclear power plant projects at Narora and Kalpakkam is surveyed. Performance of industrial production units such as nuclear power stations at Tarapur and Kota, the Nuclear Fuel Complex at Hyderabad, Atomic Minerals Division, ISOMED - the radiation sterilisation plant for medical products, the Indian Rare Earths Ltd., the Electronics Corporation of India Ltd., and the Uranium Corporation of India Ltd., is reported. India's participation in the activities of the International Atomic Energy Agency and collaboration with other countries are also mentioned. (M.G.B.)

  2. Comparative study of i-line and DUV lithography for 0.35 um and beyond

    Science.gov (United States)

    Samarakone, Nandasiri; Chang, Wayne H.; Tandberg, Erik; Elliot, Christina; Wang, Timothy Y.

    1995-05-01

    New I-line resists are claimed to be usable at 0.35 micrometers design rules. We have examined the suitability of several such materials (JSR IX750, Sumitomo PFi-38a, OCG RX64I) for this purpose and compared them with our production 0.5 micrometers resist, JSR IX700. A variety of criteria have been used, including the measured focus exposure windows at e-min and e-max, DOF vs. CD for grouped and isolated lines as well as contacts, linearity, and proximity response as a function of pitch. A limited study has been done on the impact of embedded phase shift reticles on printing small geometry contacts. We report upon the process improvements observed with two different reticle transmissions, their impact on isofocal bias, as well as the issue of sidelobe formation. Proponents of DUV claim that modern DUV materials exhibit significant advantages in terms of process window and more over are applicable to smaller geometries without the need for supplementary techniques such as phase shifting or modified illumination. In this study, we have examined the performance of a number of DUV materials (BASF ST3.5, OCG ARCH, JSR KRFL2 and an as yet experimental JSR resists) on ASM-L and Nikon excimer laser steppers. Limited results were also obtained using Shipley 2408 and dyed XP-9444 (0.8) on the SVG Micrascan II. Our studies conclude with a comparison of the CD swing observed over a variety of chemically mechanically planarized steps. This has been done for selected I-line and DUV resists with the aid of a TAR or BARC or as in the case of the broad band SVG system either a BARC or a dyed resist.

  3. Preliminary socioeconomic and community planning studies

    International Nuclear Information System (INIS)

    The timing of resettlement on Bikini Atoll and the nature of a master plan to guide construction of a new community depend on four critical determinants which are not yet definitively known. The Bikini Atoll Rehabilitation Committee (BARC) and its consultants have been addressing three of these: a. How long it will take to restore Bikini Island, which will be the main settlement area, to a habitable state. The methods under investigation by BARC for decontaminating the island might be considered as alternatives or, possibly in combination. They vary considerably, not only with respect to cost, but also with respect to important factors such as: - how long it will take to decontaminate the island (i.e. to reduce radiation to levels acceptable within Federal standards), - the necessity of removing existing vegetation and the time and effort needed to restore environment and vegetation to a state sufficient to support a new community at a reasonable standard of amenity, - requirements for repeated or continual application of decontamination procedures (and associated risks), and - implications for potential constraints on the lifestyle of the people who resettle on Bikini Island. b. Adequacy of water resources (groundwater and rainwater catchment potential) on Bikini and Eneu Islands to support both revegetation as necessary, and a new community. c. The likely state of the Bikini people (size of the population, location(s), living conditions, financial commitments, etc.) at the time their atoll is ready for resettlement. d. The judgment and wishes of the Bikini people regarding a community plan in light of all the foregoing factors, once they become known

  4. Bikini Atoll Rehabilitation Committee Report no. 5 Status March 31, 1987. Submitted to the U.S. Congress, House and Senate Committees on Interior Appropriations, pursuant to House Report 99-1002 and Public Law 99-500. Department of Interior Account no. 14X0414/TT-1580X08, Washington, DC

    International Nuclear Information System (INIS)

    The principal findings of Report No. 5, Bikini Atoll Rehabilitation Committee, March 31, 1987, are as follows: (1) Three principal methods for contamination control are under study at Bikini Atoll: removal of top soil, treatment of soil with potassium salt, and treatment by irrigation with sea water. The latter two should be cheaper and ecologically superior to excavation. All three methods have reduced the uptake of cesium-137 by coconuts and vegetables. (2) It is encouraging to report that in one sea water trial the beneficial effect has lasted for at least 1.6 years after treatment. Third-year results from the experiment should become available this year. (3) Various trials are under way to determine optimum treatment schedules (amount of agent per treatment, frequency of treatments) and the duration of the effects thereby engendered. Some schedules include more than one type of treatment. Initial results from these trials are becoming available during the present year. Until such detailed information is available and securely established, specific recommendations for a rehabilitation program should not be made. (4) It is now thought that the active agent in sea water is the sodium ion. Cation equivalency tests which take into account potassium, sodium and magnesium are under way. (5) As reported previously, Eneu may be settled now. BARC recommends that after Governmental review and possible modification, the conceptual designs now available be developed for engineering purposes to permit rehabilitation logistics and construction to get under way. (6) On the basis of the findings thus far, and making 'reasonable' assumptions about the construction costs of community facilities, BARC estimates that the total rehabilitation costs will lie in the range of $55 to $90 million. Most of the range is due to uncertainty regarding the decontamination program. (author)

  5. Experience in the application of the IAEA QA code and guides to the manufacture of nuclear reactor components

    International Nuclear Information System (INIS)

    India has made considerable progress in the indigenous manufacture of 'Quality' nuclear reactor components. All activities associated with the development of atomic energy from mining of strategic minerals to the design, construction, and operation of nuclear power plants including supporting research and development efforts are mainly carried out by the Department of Atomic Energy (DAE). Through the sustained efforts of DAE, the major industries, both in public and private sectors supplying nuclear components have now adopted the practice of systematic quality assurance (QA). The stringent QA steps are mandatory for achieving the desired quality in the manufactured nuclear components. Control blades for BWRs are now indigenously manufactured by the Atomic Fuels Division (AFD) of Bhabha Atomic Research Centre (BARC), a constituent unit of DAE. For the Project Dhruva, a 100 MW(th) nuclear reactor, constructed at BARC, Trombay, Bombay, an independent cell was formed to carry out quality audit on the manufactured components. The components were designed, fabricated, inspected and tested to the desired quality level. The QA activities were enforced from the procurement of raw materials to the audit of the completed component for monitoring the manufacturer's continued compliance with the design. The major components of Dhruva, viz. calandria, end-shield, coolant channels, heat exchangers, etc., were covered under these quality audit activities. The paper highlights the QA programme implemented in the manufacture of control blades for BWRs, illustrated with a typical example, the end-shield for Dhruva. The authors consider that the recommendations and guidelines provided in the documents 50-SG-QA3, 50-SG-QA8, 50-SG-QA10, etc., were useful in providing a formal and systematic framework, under which various quality assurance functions have been carried out

  6. Low level estimation of 1,4-dioxane in ambient air

    International Nuclear Information System (INIS)

    The chemical, 1,4-dioxane does have much relevance with respect to Indian Nuclear Power Programme for counting of Tritium, which is mainly generated during the operation of nuclear research reactors and power reactors which use heavy water. Tritium analysis is routinely carried out at BARC. The scintillation solutions which are used for tritium counting, consist of mainly 1,4 dioxane and naphthalene along with minor concentration of PPO/POPOP. Each sample analysis generates about 10 ml of tritium contaminated spent scintillation liquid waste. Total generation rate of the waste in a typical PHWR reactor is about 2-3 m3 /year. Controlled incineration of scintillation liquids has been opted at BARC for the treatment of radioactive organic waste. Now that 1,4-dioxane has shown threat to human health and environment, it is important and necessary to know its levels (concentrations) in different environmental compartments to evaluate the risks associated with it. Standard methods are available for the measurement of 1,4-dioxane in air. Higher concentration can be estimated by direct analysis but estimation at lower levels (parts per billion-ppb) requires pre concentration prior to its analysis. Here an improved method that offers increased sensitivity has been used for determining lower levels of 1,4-dioxane. This report presents (1) the development of the methodology for the estimation of 1,4-dioxane at ppb levels using cryogenic pre-concentration and subsequent analysis by Gas Chromatograph with Electron Capture detector (GC-ECD) (2) techniques to check the incineration efficiency and release of 1,4-dioxane to the environment. The data generated by this study could be further used in the evaluation of risk. (author)

  7. Definition of Soybean Genomic Regions That Control Seed Phytoestrogen Amounts

    Directory of Open Access Journals (Sweden)

    Kassem My A.

    2004-01-01

    Full Text Available Soybean seeds contain large amounts of isoflavones or phytoestrogens such as genistein, daidzein, and glycitein that display biological effects when ingested by humans and animals. In seeds, the total amount, and amount of each type, of isoflavone varies by 5 fold between cultivars and locations. Isoflavone content and quality are one key to the biological effects of soy foods, dietary supplements, and nutraceuticals. Previously we had identified 6 loci (QTL controlling isoflavone content using 150 DNA markers. This study aimed to identify and delimit loci underlying heritable variation in isoflavone content with additional DNA markers. We used a recombinant inbred line (RIL population ( n=100 derived from the cross of “Essex” by “Forrest,” two cultivars that contrast for isoflavone content. Seed isoflavone content of each RIL was determined by HPLC and compared against 240 polymorphic microsatellite markers by one-way analysis of variance. Two QTL that underlie seed isoflavone content were newly discovered. The additional markers confirmed and refined the positions of the six QTL already reported. The first new region anchored by the marker BARC-Satt063 was significantly associated with genistein ( P=0.009 , R 2 =29.5% and daidzein ( P=0.007 , R 2 =17.0% . The region is located on linkage group B2 and derived the beneficial allele from Essex. The second new region defined by the marker BARC-Satt129 was significantly associated with total glycitein ( P=0.0005 , R 2 =32.0% . The region is located on linkage group D1a+Q and also derived the beneficial allele from Essex. Jointly the eight loci can explain the heritable variation in isoflavone content. The loci may be used to stabilize seed isoflavone content by selection and to isolate the underlying genes.

  8. Measurement of internal diameter of pressure tubes in pressurized heavy water reactors using ultrasonics

    International Nuclear Information System (INIS)

    The Pressure Tube in Pressurized Heavy Water Reactors (PHWRs) undergoes dimensional changes due to the effects of creep and growth as it is subjected to high pressure and temperature, which causes Pressure Tubes to permanently increase in length and diameter and to sag because of weight of fuel and coolant (heavy water) contained in it. These dimensional changes are due to prolonged stresses under high temperature and radiation. Pressure Tube stresses are evaluated for both beginning and end of life for accounting the Pressure Tube dimensional changes that occur during its design life. At the beginning of life, the initial wall thickness and un-irradiated material properties are applied. At the end of life, Pressure Tube diameter and length increases, while wall thickness decreases. Material strength also increases during that period. The increase in Pressure Tube diameter results in squeezing of garter spring spacer between the pressure and calandria Tubes. It also causes unacceptable heat removal from the fuel due to an increased amount of primary coolant that bypasses the fuel bundles. This reduces the critical channel power at constant flow. Hence the periodic monitoring of pressure Tube diameter is important for these reasons. This is also required as per the applicable codes and standards for In-Service Inspection of PHWRs. Mechanical measurement from ID of the Tube during periodic monitoring is not practically feasible due to high radiation and inaccessibility. This necessitates the development of NDT technique using Ultrasonics for periodic in-situ measurement of ID of pressure Tubes with a BARC made remotely operated drive system called BARCIS (BARC Channel Inspection system). The development of Ultrasonic based ID measurement techniques and their actual applications in PHWRs Pressure tubes are being discussed in this paper. (author)

  9. Association mapping of soybean seed germination under salt stress.

    Science.gov (United States)

    Kan, Guizhen; Zhang, Wei; Yang, Wenming; Ma, Deyuan; Zhang, Dan; Hao, Derong; Hu, Zhenbin; Yu, Deyue

    2015-12-01

    Soil salinity is a serious threat to agriculture sustainability worldwide. Seed germination is a critical phase that ensures the successful establishment and productivity of soybeans in saline soils. However, little information is available regarding soybean salt tolerance at the germination stage. The objective of this study was to identify the genetic mechanisms of soybean seed germination under salt stress. One natural population consisting of 191 soybean landraces was used in this study. Soybean seeds produced in four environments were used to evaluate the salt tolerance at their germination stage. Using 1142 single-nucleotide polymorphisms (SNPs), the molecular markers associated with salt tolerance were detected by genome-wide association analysis. Eight SNP-trait associations and 13 suggestive SNP-trait associations were identified using a mixed linear model and the TASSEL 4.0 software. Eight SNPs or suggestive SNPs were co-associated with two salt tolerance indices, namely (1) the ratio of the germination index under salt conditions to the germination index under no-salt conditions (ST-GI) and (2) the ratio of the germination rate under salt conditions to the germination rate under no-salt conditions (ST-GR). One SNP (BARC-021347-04042) was significantly associated with these two traits (ST-GI and ST-GR). In addition, nine possible candidate genes were located in or near the genetic region where the above markers were mapped. Of these, five genes, Glyma08g12400.1, Glyma08g09730.1, Glyma18g47140.1, Glyma09g00460.1, and Glyma09g00490.3, were verified in response to salt stress at the germination stage. The SNPs detected could facilitate a better understanding of the genetic basis of soybean salt tolerance at the germination stage, and the marker BARC-021347-04042 could contribute to future breeding for soybean salt tolerance by marker-assisted selection.

  10. PREFACE: International Symposium on Vacuum Science & Technology and its Application for Accelerators (IVS 2012)

    Science.gov (United States)

    Pandit, V. S.; Pal, Gautam

    2012-11-01

    clearly indicates that industry has advanced quite significantly. During the symposium, the Indian Vacuum Society honoured two distinguished personalities for their remarkable and significant contributions to the field of vacuum science and development of technology in the country. Awards were presented for both oral and poster papers during the symposium. A committee evaluated the scientific content and clarity of presentation of contributed papers. We believe that deliberations and discussions at the symposium will help gain a better understanding of the complicated and involved technology of vacuum science and be of benefit to scientists and technologists. Subimal Saha Convener Gautam Pal Co-Convener V S Pandit Secretary Surajit Pal Treasurer Conference photograph International Advisory Committee National Advisory Committee S BanerjeeDAE/IndiaR K Bhandari (Chairman)VECC Rockett AngusAVS/USAD L BandyopadhyayIVS A V Dadve CdrPfeiffer Vac /IndiaS B BhattIPR M Barma TIFR/IndiaK G BhushanBARC R K BhandariVECC/IndiaAlok ChakrabartiVECC R C BudhaniNPL, IndiaD P ChakravartyBARC Shekhar ChanderCEERI/IndiaTushar DesaiMumbai Univ S C ChetalIGCAR/IndiaR DeyVECC K L ChopraIIT Delhi/IndiaS C GadkariBARC Christian DayKIT/GermanyS K GuptaIUVSTA/India Kraemer DieterFAIR/GermanyShrikrishna GuptaBARC L M GantayatBARC/IndiaRajendra JatharAgilent Technologies R B GroverDAE, BARC/IndiaS N JoshiCEERI P D Gupta RRCAT/IndiaD KanjilalIUAC Szajman JakubVSA/AustraliaC MallikVECC R N JayarajNFC/IndiaS G MarkandeyaBRNS S KailasBARC/IndiaK C MittalBARC P K KawIPR/IndiaS NagarjunHHV Bangalore Lalit KumarMTRDC/IndiaK G M NairIGCAR Jean Larour Ecole/FranceGautam Pal (Co-convener)VECC Marminga LiaTRIUMF/CanadaSurajit Pal (Treasurer)VECC Shekhar MishraFermilab/USA V S Pandit (Secretary)VECC Ganapatirao MyneniJlab/USaR G PillayTIFR S V NarasaiahHHV/IndiaMohan PradeepNPL K RadhakrishnanISRO/IndiaY Ranga RaoVac Techniques A S Raja RaoIVS/IndiaR RanganathanSINP T RamasamiDST/IndiaSubimal Saha (Convener

  11. Identification of Leaf Rust Resistance Gene in Wheat Line LB0288%中国小麦LB0288中抗叶锈病基因的鉴定

    Institute of Scientific and Technical Information of China (English)

    齐爱勇; 李星; 赵振杰

    2011-01-01

    明确中国小麦LB0288中所含的抗叶锈病基因,找到与其紧密连锁的DNA分子标记.将小麦LB0288和感病小麦品种Thatcher杂交,获得F1、F2代群体,用叶锈菌小FHTT分别对双亲及其杂交后代进行叶锈鉴定并进行标记分析.抗性鉴定结果表明F2代群体时呈现一对显性基因的抗感分离比例,经过亲本和抗感池间标记筛选以及F2代群体的标记检测,位于5DL的SSR标记barc144与抗病基因连锁,遗传距离为5.3 cM,同时Lr1的STS标记与之共分离,根据该基因的抗性特点和染色体位置推断为Lrl.此实验通过抗性鉴定、遗传分析和分子标记等手段确定LB0288中含有小麦抗叶锈病基因Lr1.%The objective of this study was to identify leaf rust resistance gene and its closely linked molecular markers in LB0288. In order to make use of the leaf rust resistance gene in LB0288 effectively, F1 and F2 populations from the cross LB0288/Thatcher were tested with pathotype FHTT for following marker analysis.The results indicated that LB0288 carried a single dominant resistance gene Lr1, closely linked to the STS markers of Lr1 and SSR marker barc144, with genetic distances of 0 cM and 5.3 cM, respectively. Based on the chromosomal location and seedling reactions, it could be concluded that LB0288 carried resistance gene Lr1.

  12. Radiation safety and accident experience at gamma irradiation plants

    International Nuclear Information System (INIS)

    Gamma irradiation plants for the sterilization of medical products, preservation of food grains and for various other applications employ multikilocurie 60Co sealed sources inside shielded irradiation cells. A number of interlocks are provided between the cell entry door and the source raise mechanisms, in order to prevent the entry of any person to the cell when the source is in the exposed condition. The present paper gives the general safety features and the interlocks employed in these plants along with the safety features of irradiation plants at BARC, namely 106 Ci Isomed plant for the sterilization of medical products, 105 Ci FIPLY plant for research in food preservation and 105 Ci PANBIT plant for industrial research. Over the last two decades five cases of accidental exposure have been reported in literature in which the operator gained entry to the irradiation cell when the source was in the exposed condition. Two of these cases resulted in fatalities while the remaining three cases resulted in hospitalization of the exposed individuals for six to seven weeks. A brief outline of these accidental exposure cases and the causes of the accidents are discussed in this paper. (author). 19 refs

  13. Indias Capabilities in Food Irradiation

    International Nuclear Information System (INIS)

    Full-text: India recently celebrated 50 years of nuclear application and criticality. Radiation processing Technology has been investigated and demonstrated for nearly four decades by food scientists and technologists at Bhabha Atomic Research Center, (BARC), India. It is quite essential to clarify unambiguously that under no circumstances can radiation processing using cobalt-60 radiation induce any radioactivity and naturally, leave residual radioactivity in the material being processed. To this extent, the word IRRADIATION has been replaced by the word Radiation Processing. The Indian Navy had recently approved the use of radiation processing for preserving high value food products and to optimize the procurement cost and maximize the product availability. The Board of Radiation and Isotope Technology (BRIT), India has achieved significant milestones in encouraging private entrepreneurs to set up Radiation Processing plants for food preservation and safety as well as for non-food products and medical equipment sterilization. Today there are about 25 private radiation processing plants getting ready to meet the demand and many more are following the trend. With the growing demand for Cobalt-60 source, India has exported the technology and the source to many neighboring countries and is prepared to meet the demand and support the requirements of the Cobalt-60 source in Thailand. Innovative Food Technologies Co. Ltd provide consultancy and turnkey projects to set up Radiation processing Plants, Supply of Cobalt-60 source, Refurbishing Cobalt-60 source, provide comprehensive training in Plant safety, maintenance and security in Thailand and ASEAN

  14. Avenues for research and technology development for industrial applications using electron beam facilities and their exploitation through BRNS schemes

    International Nuclear Information System (INIS)

    BARC has been responsible to establish indigenously designed state-of-the-art electron accelerator facilities at its Electron Beam Centre at Kharghar, Navi Mumbai. The centre offers two versatile machines namely, (i) 3 MeV, 30 kW Parallel Coupled Self Capacitance type Multiplier (Dynamitron) DC accelerator and (ii) 10 MeV, 10 kW RF Electron Linac. While these machines are being used by scientists and engineers from within DAE, there is tremendous scope for exploiting their use by researchers in the country for basic research as well as by technologists and entrepreneurs for exploiting its potential for industrial applications. However, due to lack of adequate information about the facilities and due to paucity of research funds for the academia in the country, there is always a gap which researchers seldom look forward to be filled up appropriately. The present talk will give a glimpse of some opportunities to exploit the facilities at EBC, Kharghar for variety of applications followed by a brief presentation on provisions under BRNS to carry out sponsored research activities for basic research as well as for technology development for the industrial applications. (author)

  15. Simulations of SiPM based scintillation detector for PANDA

    International Nuclear Information System (INIS)

    The Facility for Antiproton and Ion Research (FAIR) is a future project at GSI which will extend hadron physics studies up to the charm meson region using antiproton beams together with a state-of-the-art PANDA (acronym for antiProton ANnihilation at DArmstadt) detector. The physics aim, in a broader sense, is to address the fundamental problems of hadron physics and aspects of Quantum Chromo Dynamics (QCD) at low energies. The proposed work in India will consist of several parts: (i) development of a SiPM based scintillation tile hodoscope for TOF information, (ii) development of a luminosity detector (silicon strip detector), and (iii) simulation studies of these detectors design as well as physics case studies. The present paper reports the initial simulation studies that have been started at Nuclear Physics Division (NPD), BARC, on the silicon photomultiplier(SiPM) based fast scintillation detector (SciTil). The hardware development activities on this SciTil detector, that are also going on in parallel at NPD, has been reported in an another contribution to this proceedings

  16. Blind prediction exercise on modeling of PHWR fuel at extended burnup

    International Nuclear Information System (INIS)

    A blind prediction exercise was organised on Indian Pressurised Heavy Water Reactor (PHWR) fuel to investigate the predictive capability of existing codes for their application at extended burnup and to identify areas of improvement. The blind problem for this exercise was based on a PHWR fuel bundle irradiated in Kakrapar Atomic Power Station-I (KAPS-I) up to about 15 000 MWd/tU and subjected to detailed post-irradiation examination (PIE) in the hot cells facility at BARC. Eleven computer codes from seven countries participated in this exercise. The participants provided blind predictions of fuel temperature, fission gas release, internal gas pressure and other performance parameters for the fuel pins. The predictions were compared with the experimental PIE data which included fuel temperature derived from fuel restructuring, fission gas release measured by fuel pin puncturing, internal gas pressure in pin, cladding oxidation and fuel microstructural data. The details of the blind problem and an analysis of the results of blind predictions by the codes vis-a-vis measured data are provided in this paper

  17. Proceedings of the DAE-BRNS theme meeting on chemistry in atomic energy programme

    International Nuclear Information System (INIS)

    The pivotal role played by chemistry in all the stages of atomic energy programme, right from mineral exploration, materials processing, fuel fabrication, coolant, control and structural materials, reactor chemistry, fuel recycling and actinide partitioning to radioactive waste management, has been explicitly demonstrated in the last few decades. The discoveries and developments in chemical sciences that have contributed to the formulation and successful implementation of our nuclear programme are enormous. It is to the credit of all our colleagues of Department of Atomic Energy to reckon the chronology of mile stones in our programme and how they place our nation on the global map of nuclear energy. The theme meeting on Chemistry in Atomic Energy Programme is an outcome of the thinking of some of our colleagues in BARC to take stock of the accomplishments made hitherto and to prepare a roadmap to meet the challenges of future advanced reactor regimes, while safeguarding the strategic interests of mankind. It is not out-of-context to record here that India, with its rich experience, is poised to play a major role in the global nuclear power programme, through bilateral international collaborations as well as on the platform of IAEA. Papers relevant to INIS are indexed separately

  18. Hyperbilirubinemia in normal healthy donors

    Directory of Open Access Journals (Sweden)

    Arora Veena

    2009-01-01

    Full Text Available The present study was carried out in B.A.R.C. Hospital Blood Bank over a span of five years, and includes 2734 donors. All the bags were screened for HIV, HBsAg, HCV and VDRL and the plasma in the pilot tubes of the blood bags was observed to detect any abnormality in color. In 27 cases plasma was found to be icteric and liver function tests were carried out on these samples. Two donors showed higher SGPT level, and were excluded. No significant increases in liver enzymes were recorded in the others. Causes of icteric plasma in these apparently healthy donors are discussed. Differential diagnosis includes Gilbert′s disease, hemolytic anemia, drug-induced anemia and other hepatic causes of hyperbilirubinemia, of which Gilbert′s disease is most probable cause with a prevalence of 0.91% in our population. As there are no studies to document the safety of the recipients receiving such abnormal colored plasma as well as to document the hazards in its transfusion, the question arises whether to transfuse such units or not. This study highlights this dilemma. A reassessment of existing policies and regulations is merited.

  19. DC Electron Accelerators - a perspective on 3 MeV DC accelerator at EBC

    International Nuclear Information System (INIS)

    Electron beam accelerators are finding wide ranging applications like surface curing of coatings, cross-linking polymeric materials, sterilization of medical products, coloration of diamonds, disinfection and preservation of food products, purification of industrial and biological waste etc. Electron beam energy and dose rate for different application differs widely depending upon the type of product and the desired modification. The beam energy and dose rate requirement for these types of applications ranges between 0.15 MeV to 10 MeV and few kilowatt to hundreds of kilowatts. Electrostatic accelerators (direct current type) are suitable option for large throughput, high electrical efficiency for the above applications. In view of the growing needs we have taken up indigenous development of industrial accelerators at APPD, BARC. A machine rated for 3 MeV, 30 kW beam power is in the trial operations at Electron Beam Centre, Kharghar, Navi Mumbai. The 3 MV DC supply for this based on a parallel fed voltage multiplier scheme considering power efficiency, energy stability and reliability. The accelerator is designed to operate with beam energies from 1 MeV to 3 MeV with beam current of 0-10 mA

  20. Fabrication of MOX fuel - our experience

    International Nuclear Information System (INIS)

    Advance Fuel Fabrication Facility is a facility of BARC at Tarapur for fabrication of Plutonium based Mixed Oxide fuel. Consideration of glove box design, process equipment design and automation system for Plutonium based fuel fabrication line starts at the stage of planning of the flow sheet and layout. The process flow sheet and layout of the fabrication line is frozen for a continuous process in series in such a way that flow of material remains unidirectional and as much as possible in a straight line at a fixed comfortable operational elevation. Since the layout for the fuel fabrication line is decided for a continuous process in series, glove boxes are installed as a train and are intercommoned to each other by tunnel and adopter panels. The process equipments of fuel fabrication line require material feeding and transfer of intermediate product to next equipment for processing till the final product, fuel pin, get fabricated. So for continuous processing of the material a combination of automation system as well as custom designed and design modified equipment to suit to glove box adaptation is required. This paper describes the present scenario and scope for improvement in MOX fuel fabrication line and highlights the advantages

  1. Angular analyses of exclusive $\\Bbar\\to X \\ell_1 \\ell_2$ with complex helicity amplitudes

    CERN Document Server

    Dey, Biplab

    2015-01-01

    We present the differential rates for exclusive $\\Bbar\\to X \\ell_1 \\ell_2$, where $\\ell_1$ is a charged massless lepton and $\\ell_2$ is a charged or neutral massless lepton, and $X$ is a mesonic system up to spin 2. The cases of interest are semileptonic (SL) $\\Bbar\\to \\xcu\\ellm \\barnuell$ decays, and $\\Bbar \\to X_s \\ellm \\ellp$ where the the di-lepton can be $c \\bar{c}$ resonances or non-resonant electroweak penguins (EWP). We consider helicity amplitudes having non-zero relative phases that can be potential new sources for CP-violation. Our motivations for these additional phases include a complex right-handed admixture in the hadronic weak charged current for the SL decays and complex Wilson coefficients in the effective Hamiltonians for the EWP decays. We demonstrate the efficacy of a novel technique of projecting out the individual angular moments in the full rate expression in a model-independent fashion. Our work is geared towards ongoing data analyses at $\\babar$ and LHCb.

  2. Biennial report of Radiochemistry Division 1997-1998

    International Nuclear Information System (INIS)

    This report describes the work carried by Radiochemistry Division of BARC during the period 1997 and 1998. The work is divided in three main branches (1) Nuclear Chemistry (2) Actinides Chemistry (3) Actinide Spectroscopy. During this period research in nuclear chemistry was focussed on nuclear fission, nuclear reactions, neutron activation analysis, use of nuclear techniques for understanding of physico-chemical phenomena and developmental activities in non-destructive assay techniques. The research work on chemistry of actinides was directed on basic as well as applied studies related to complexation and extraction behaviour of actinides and lanthanides with a variety of novel ligands. The choice of complexing ligands was made with a view to examining the suitability in reprocessing streams, treatment of high level active waste and recovery of valuables. The third part spectroscopy of actinides describes the basic studies solid state spectroscopy of actinides and analytical spectroscopy for trace metallic assay. The solid state spectroscopy investigations were carried out using EPR, ENDOR, fluorescence, thermally stimulated luminescence and photo acoustic for spectroscopy techniques. In the analytical spectroscopy work a lot of stress was given on finding suitable chemical separation procedures for pre concentration of trace metals and a determination by ICP-AES/ETA-AAS techniques. (author)

  3. VBMC: a formal verification tool for VHDL program

    International Nuclear Information System (INIS)

    The design of Control and Instrumentation (C and I) systems used in safety critical applications such as nuclear power plants involves partitioning of the overall system functionality into sub-parts and implementing each sub-part in hardware and/or software as appropriate. With increasing use of programmable devices like FPGA, the hardware subsystems are often implemented in Hardware Description Languages (HDL) like VHDL. Since the functional bugs in such hardware subsystems used in safety critical C and I systems have serious consequences, it is important to use rigorous reasoning to verify the functionalities of the HDL models. This report describes the design of a software tool named VBMC (VHDL Bounded Model Checker). The capability of this tool is in proving/refuting functional properties of hardware designs described in VHDL. VBMC accepts design as a VHDL program file, functional property in PSL, and verification bound (number of cycles of operation) as inputs. It either reports that the design satisfies the functional property for the given verification bound or generates a counterexample providing the reason of violation. In case of satisfaction, the proof holds good for the verification bound. VBMC has been used for the functional verification of FPGA based intelligent I/O boards developed at Reactor Control Division, BARC. (author)

  4. Progress in the improvement of Indian mustard (Brassica juncea (Linn.) Czern and Coss.) with yellow seed coat colour

    International Nuclear Information System (INIS)

    The main objectives in the mustard breeding programme at BARC are to evolve high yielding strains with yellow seed coat colour. Two of the Trombay mustard (TM) selections, TM-2 and TM-4 have been released for commercial cultivation in Assam State. In 1991-92 crop season, these two cultures were also evaluated in 60 and 200 minikit trials respectively at the farmers fields in Rajasthan State. The mean yield of TM-2 and TM-4 was however lower than the improved cultivar grown as the check. In the trials conducted at 3-4 locations by the Punjabrao Agricultural University for the past four years, TM-9 gave the highest mean yield of 840 kg/ha. TM-9 and TM-21 were the top yielders in the non-traditional mustard growing areas in Maharashtra State. TM-18 is presently the earliest maturing mustard available in the country. Such early cultures have the potential to replace toria (Brassica campestris var. toria) in the multiple cropping system. Simple and reliable methods for screening mustard germplasm for aphid tolerance at three different stages of plant growth have been developed. Using these methodologies, selections showing tolerance against crucifer aphid (Lipaphis erysimi Kalt.) have been identified. Powdery mildew (Erysiphe cruciferarum Opiz ex Junell) resistant selection have been isolated from a cross between TM-18 and Brassica carinata. (author). 12 refs, 1 fig., 10 tabs

  5. Measurement of High-$Q^{2}$ Charged-Current $e^{+}p$ Deep Inelastic Scattering Cross Sections at HERA

    CERN Document Server

    Breitweg, J

    2000-01-01

    The e^+p charged-current deep inelastic scattering cross sections, $d\\sigma/dQ^2$ for Q^2 between 200 and 60000 GeV^2, and $d\\sigma/dx$ and $d\\sigma/dy$ for Q^2 > 200 GeV^2, have been measured with the ZEUS detector at HERA. A data sample of 47.7 pb^-1, collected at a center-of-mass energy of 300 GeV, has been used. The cross section $d\\sigma/dQ^2$ falls by a factor of about 50000 as Q^2 increases from 280 to 30000 GeV^2. The double differential cross section $d^2\\sigma/dxdQ^2$ has also been measured. A comparison between the data and Standard Model (SM) predictions shows that contributions from antiquarks ($\\bar{u}$ and $\\bar{c}$) and quarks (d and s) are both required by the data. The predictions of the SM give a good description of the full body of the data presented here. A comparison of the charged-current cross section $d\\sigma/dQ^2$ with the recent ZEUS results for neutral-current scattering shows that the weak and electromagnetic forces have similar strengths for Q^2 above $M^2_W, M^2_Z$. A fit to the...

  6. Effect of high current electron beam in a 30 MeV radio frequency linac for neutron-time-of-flight applications

    Energy Technology Data Exchange (ETDEWEB)

    Nayak, B., E-mail: biswaranjan.nayak1@gmail.com; Acharya, S.; Rajawat, R. K. [Accelerator and Pulsed Power Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India); DasGupta, K. [Accelerator and Pulsed Power Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India); Beam Technology Development Group, BARC, Mumbai 400085 (India)

    2016-01-15

    A high power pulsed radio frequency electron linac is designed by BARC, India to accelerate 30 MeV, 10 A, 10 ns beam for neutron-time-of-flight applications. It will be used as a neutron generator and will produce ∼10{sup 12}–10{sup 13} n/s. It is essential to reduce the beam instability caused by space charge effect and the beam cavity interaction. In this paper, the wakefield losses in the accelerating section due to bunch of RMS (Root mean square) length 2 mm (at the gun exit) is analysed. Loss and kick factors are numerically calculated using CST wakefield solver. Both the longitudinal and transverse wake potentials are incorporated in beam dynamics code ELEGANT to find the transverse emittance growth of the beam propagating through the linac. Beam loading effect is examined by means of numerical computation carried out in ASTRA code. Beam break up start current has been estimated at the end of the linac which arises due to deflecting modes excited by the high current beam. At the end, transverse beam dynamics of such high current beam has been analysed.

  7. Role of guard rings in improving the performance of silicon detectors

    Indian Academy of Sciences (India)

    Vijay Mishra; V D Srivastava; S K Kataria

    2005-08-01

    BARC has developed large-area silicon detectors in collaboration with BEL to be used in the pre-shower detector of the CMS experiment at CERN. The use of floating guard rings (FGR) in improving breakdown voltage and reducing leakage current of silicon detectors is well-known. In the present work, it has been demonstrated that FGRs can also be used to improve the spectroscopic response of silicon detectors. The results have been confirmed by carrying out -particle ≈ 5 MeV) and -ray (60 keV) spectroscopies with the FGR floating or biased and the underlying physics aspect behind the change in spectra is explained. Although reduction in leakage current after biasing one of the guard rings has been reported earlier, the role of a guard ring in improving the spectroscopic response is reported for the first time. Results of TCAD simulations for silicon detectors with the guard ring under different biasing conditions have been presented. Low yield in producing large-area silicon detectors makes them very costly. However, with one of the FGRs biased even a detector having large surface leakage current can be used to give the same response as a very good detector. This makes the use of large-area silicon detectors very economical as the yield would be very high (> 90%).

  8. A novel europium (III) nitridoborate Eu3[B3N6]: Synthesis, crystal structure, magnetic properties, and Raman spectra

    Science.gov (United States)

    Aydemir, Umut; Kokal, Ilkin; Prots, Yurii; Förster, Tobias; Sichelschmidt, Jörg; Schappacher, Falko M.; Pöttgen, Rainer; Ormeci, Alim; Somer, Mehmet

    2016-07-01

    A novel europium (III) nitridoborate, Eu3[B3N6], was successfully synthesized by oxidation of Eu3II[BN2]2 with Br2 at 1073 K. The compound crystallizes in the trigonal space group R 3 barc (No:167) with a=11.9370(4) Å, c=6.8073(4) Å, and Z=6. The crystal structure of Eu3[B3N6] consists of isolated, planar cyclic [B3N6]9- units which are charge-balanced by Eu3+ cations. The oxidation state of Eu was investigated by Mössbauer spectroscopy, electron spin resonance (ESR) spectroscopy, and quantum chemical calculations. The 151Eu Mössbauer spectroscopic measurement at 77 K reveals that the main signal at δ=0.93(7) mm/s is originating from trivalent Europium. Eu3[B3N6] showed no ESR signal in accordance with a non-magnetic (J=0) 7F0 ground state of the 4f6 configuration. Quantum chemical calculations find six electrons in the 4f subshell (4f6) of Eu indicating an oxidation state of +3. We present for the first time the vibrational spectra of a compound with cyclic trimer [B3N6]9- moieties. The Raman spectrum of Eu3[B3N6] is in good agreement with the predicted number of modes for the spectroscopically relevant cyclic [B3N6]9- group with D3h symmetry.

  9. Improving material-specific dispense processes for low-defect coatings

    Science.gov (United States)

    Smith, Brian; Ramirez, Raul; Braggin, Jennifer; Wu, Aiwen; Anderson, Karl; Berron, John; Brakensiek, Nick; Washburn, Carlton

    2010-04-01

    Minimizing defects in spin-on lithography coatings requires a careful understanding of the interactions between the spin-on coating material and the filtration and dispense system used on the coating track. A wet-developable bottom anti-reflective coating (BARC) was examined for its interaction with polyamide and UPE media when utilizing the Entegris IntelliGen Mini dispense system. In addition, a new method of priming the filter and pump is described which improves the wetting of the filter media, preventing bubbles and other defect-generating air pockets within the system. The goal is to establish plumb-on procedures that are material and hardware specific to avoid any defect problems in the coating process, as well as to gain a better understanding of the chemical and physical interactions that lead to coating defects. Liquid particle counts from a laboratory-based filtration stand are compared with on-wafer defects from a commercial coating track to establish a correlation and allow better prediction of product performance. This comparison in turn will provide valuable insight to the engineering process of product filtration and bottling at the source.

  10. Response of neutron dosimeters to pulsed neutron fields in high energy electron accelerators at Indus Complex, RRCAT

    International Nuclear Information System (INIS)

    Indus Accelerator Complex (IAC) comprises of two high energy electron accelerators namely Indus-1 SRS (450 MeV) and Indus-2 SRS (2.5 GeV). The radiation environment present is mainly due to Bremsstrahlung Photons and Photo- neutrons produced due to interaction of high-energy electrons with the structural material of accelerators. Since electron beam is pulsed in nature, the radiations produced are also pulsed. The response of commonly used Rem meters is not proper in severely pulsed neutron fields at high dose rates. They tend to underestimate the actual dose. Due to this uncertainty, an attempt was made to study the response of passive integrating type detectors in the pulsed neutron fields found in high energy electron accelerators to get an idea about the ambient neutron field in IAC. The detectors used were CR-39 foils (provided by PMS, RPAD and RSSD, BARC), Bubble Detectors (provided by Defence Laboratory, Jodhpur) and Rem Meter. Neutron dose assessment in both, accessible and inaccessible areas of IAC was carried out using these detectors and the present paper gives the results of preliminary experiments performed. (author)

  11. Characterisation of different single and multilayer films using phase modulated spectroscopic ellipsometry

    International Nuclear Information System (INIS)

    Different single layers and multilayer coatings deposited by e-beam evaporation and r.f. sputtering techniques have been characterised by the Phase Modulated Spectroscopic Ellipsometer, installed recently in the Spectroscopy Division, B.A.R.C. The Phase Modulated technique provides a faster and more accurate data acquisition process than the conventional ellipsometry. Measurements have been done on single layers of Cu, Si and ZrO2 films and on multilayer thin films devices e.g., high reflectivity mirror, beam combiner, beam splitter, narrow band filter etc. consisting of several bilayers of TiO2/SiO2. The measured Ellipsometry spectra is then fitted with a theoretical spectra generated assuming an appropriate model regarding the sample. The layer thickness and composition have been used as fitting parameters. The optical constants of the substrates have been supplied and a trial dispersion relation have been used for the layers. In case of inhomogeneous layers, trial compositions have been given for the individual components for each layer. The roughness of the layers has been taken into account by assuming the film to be an inhomogeneous mixture of material and voids. The fittings have been done objectively by minimising the squared difference (χ2) between the measured and calculated values of the ellipsometric parameters and thus accurate information have been derived regarding the thickness and optical constants (viz, the refractive index and extinction coefficient) of the different layers, the surface roughness and the inhomogeneities present in the layers. (author)

  12. Occupational exposures in industrial application of radiation during 1999-2008

    International Nuclear Information System (INIS)

    Radiation sources are used in various industrial applications like industrial radiograph, industrial irradiation, industrial fluoroscopy, nucleonic gauges, well logging etc., Gamma, beta X-ray as well as neutron sources are used for various applications. Number of radiation workers in this field has increased over the years. Due to operating conditions prevailing during the exposure as well as the strength of the sources used in some of the applications, radiation protection plays an important role in this field. Analysis of doses received by radiation workers in industry provides information on trends of doses as well as adequateness of radiation protection practices followed in this sector. In India, National Occupational Dose Registry System (NODRS) of Radiological Physics and Advisory Division (RPAD), Bhabha Atomic Research Centre (BARC) maintains personnel dose information of monitored radiation workers in the country. Analysis of occupational dose data of industrial radiation workers for last 10 years, i.e., 1999-2008 has been presented in this paper. It is observed that even though there is an increase in monitored radiation workers, percentage of persons receiving radiation exposure has come down during this period. There is also a decrease in the average annual dose as well as the collective dose. Further analysis of sub-categories shows that industrial radiography operations are the main contributor for collective dose (about 77%) followed by well logging and industrial X-ray operations (about 8% each). Thus, in addition to industrial radiography attention is also to be given to operations in these areas. (author)

  13. Development of quick scan whole body monitor for in-vivo monitoring of radiation workers and general public

    International Nuclear Information System (INIS)

    Whole body monitoring of radiation workers at nuclear facilities is a regulatory requirement and is recommended for assessment of internal contamination due to gamma emitting radio nuclides. Additionally, nuclear accidents like Chernobyl, Fukushima and radiological accidents like Goiania have clearly highlighted the need for in-vivo monitoring of the members of the public during and/or after such accidents. To cater to these requirements, a high throughput, fast screening, standing linear geometry Quick Scan Whole Body Monitor (QS-WBM) is designed, fabricated and commissioned to measure internal contamination due to gamma emitting radio nuclides (Eγ >200keV) incorporated in the human body. The system is designed to achieve sensitivity comparable with conventional WBM for 1 - 2 minutes counting time and to accommodate different body sizes of Indian occupational workers. It is calibrated using BARC reference Bottle Mannequin Absorption (BOMAB) type phantom and also using a family of BOMAB type phantoms representative of different age groups namely 1-, 5-, 10-, 15- and 20- years. The developed system will also be highly useful during emergency situations when large numbers of persons are to be monitored in short interval of time. (author)

  14. The safety and the security of radioactive sources

    International Nuclear Information System (INIS)

    A Task Group was appointed by Chairman, AERB to review the current practice and recommend procedures for ensuring the Safety and the Security of Radioactive Sources in India. The Task Group identified the issues involved and concluded that the current regulatory procedure relating to licensing was adequate in view of the stress placed on pre-licensing requirements and the undertakings obtained from the licensee and ensuring that appropriate radiation monitors and trained personnel are available at the licensee's institution. Each licensee is required to submit periodic reports confiriming the safety and the security of the sources in the possession of the institution. It is important to conduct regulatory inspection of the institutions frequently. In order to optimise the regulatory effort involved, the report recommends frequencies of inspections commensurate with the potential hazard associated with the source. For this purpose the sources are brought under three categories which are largely based on the categorization recommended by the International Atomic Energy Agency (IAEA), Vienna with deviations introduced on the basis of rationalized hazard potential associated with the sources. The importance of technical coordination between AERB and BARC is emphasised. (author)

  15. Cold Plasma: simple tool for convenient utilitarian chemistry in homogeneous and heterogeneous environments

    International Nuclear Information System (INIS)

    Cold Plasma based experimental facilities have been commissioned (XI-XII Plan periods) in Radiation and Photochemistry Division, BARC to carry out free radical and excited state-induced chemistry in single- and mixed-phase milieu. In any reaction medium, Dielectric Barrier assisted Electric Discharge generates in situ non-equilibrium plasma constituting of electrons and photons (< 10 eV each) and chemically reactive ions, excited species and free radical transients near room temperature and pressure. Choice of reactants and nature of other added ingredient(s), type of interacting surface(s) and the dielectric characteristics, the rate and amount of electric energy dissipated within etc. control various reactions’ propensities and the natures of final products, following either routine or novel, atypical chemistry. A selection of results obtained from our laboratory highlight the development and the potential use of this technology. Constant improvements in Cold Plasma reactor types, and design, fabrication and assembly of a real-time measurement system, aiming to probe mechanistic chemistry, are also underway. (author)

  16. Selected bibliography on deuterium isotope effects and heavy water

    International Nuclear Information System (INIS)

    In recent years, there has been a great deal of interest in using deuterium and heavy water not only in nuclear industry but also in various fields of basic as well as applied research in physics, chemistry and biology. As a result, the literature is being enriched with a large number of research papers and technical reports published each year. Thus, to enable the scientists to have an easy reference to these works, an endeavour has been made in this selected bibliography, to enlist the publications related to these fields. Since the interest is concerned mainly with heavy water production processes, deuterium isotope effects etc., several aspects (e.g. nuclear) of deuterium have not been covered here. The material in this bibliography which cites 2388 references has been classified under six broad headings, viz. (1) Production of heavy water, (2) Study of deuterium isotope effects, (3) Analysis and Properties of heavy water, (4) Laser Separation of deuterium, (5) Isotopic exchange reactions, and (6) Miscellaneous. The sources of information used for this compilation are chemical abstracts, nuclear science abstracts, INIS Atomindex and also some scattered search through journals and reports available in the B.A.R.C. library. However, in spite of sincere attempts for a wide coverage, no claim is being made towards the exhaustiveness of this bibliography. (author)

  17. Report of the Solid State Physics Division (July 1, 1990 to December 31, 1991)

    International Nuclear Information System (INIS)

    This is the first report summarizing the activities carried out by scientists in the recently constituted Solid State Physics Division at Bhabha Atomic Research Centre (BARC) covering the period from July 1990 to December 1991. The activities are reported in the form of individual summaries arranged under headings : Research Activities, Instrumentation, Papers published, Papers presented, Lectures, Physics colloquia, Theses and other activities. The main thrust of the research activities of the Division relates to experimental investigations of a variety of materials using microscopic scattering techniques like neutron scattering, light scattering, x-ray diffraction and related other techniques like Moessbauer Spectroscopy, calorimetry, nuclear magnetic resonance etc. During the period under review, a large number of high Tc superconductors, proteins and enzyme derivatives, micellar systems, model membranes and other complex systems have been investigated to understand their basic structural and dynamical aspects. As a result, the structure-property correlations are better appreciated, whether they relate to drug-membrane interactions or biological functions of enzymes or nature of superconductivity etc. (author). figs

  18. Thermal hydraulic studies of spallation target for one-way coupled Indian accelerator driven systems with low energy proton beam

    Indian Academy of Sciences (India)

    V Mantha; A K Mohanty; P Satyamurthy

    2007-02-01

    BARC has recently proposed a one-way coupled ADS reactor. This reactor requires typically ∼ 1 GeV proton beam with 2 mA of current. Approximately 8 kW of heat is deposited in the window of the target. Circulating liquid metal target (lead/lead-bismuth-eutectic) has to extract this heat and this is a critical R&D problem to be solved. At present there are very few accelerators, which can give few mA and high-energy proton beam. However, accelerators with low energy and hundreds of micro-ampere current are commercially available. In view of this, it is proposed in this paper to simulate beam window heating of ∼ 8 kW in the target with low-energy proton beam. Detailed thermal analysis in the spallation and window region has been carried out to study the capability of heat extraction by circulating LBE for a typical target loop with a proton beam of 30 MeV energy and current of 0.267 mA. The heat deposition study is carried out using FLUKA code and flow analysis by CFD code. The detailed analysis of this work is presented in this paper.

  19. The physics of accelerator driven sub-critical reactors

    Indian Academy of Sciences (India)

    S B Degweker; Biplab Ghosh; Anil Bajpal; S D Pranjape

    2007-02-01

    In recent years, there has been an increasing worldwide interest in accelerator driven systems (ADS) due to their perceived superior safety characteristics and their potential for burning actinides and long-lived fission products. Indian interest in ADS has an additional dimension, which is related to our planned large-scale thorium utilization for future nuclear energy generation. The physics of ADS is quite different from that of critical reactors. As such, physics studies on ADS reactors are necessary for gaining an understanding of these systems. Development of theoretical tools and experimental facilities for studying the physics of ADS reactors constitute important aspect of the ADS development program at BARC. This includes computer codes for burnup studies based on transport theory and Monte Carlo methods, codes for studying the kinetics of ADS and sub-critical facilities driven by 14 MeV neutron generators for ADS experiments and development of sub-criticality measurement methods. The paper discusses the physics issues specific to ADS reactors and presents the status of the reactor physics program and some of the ADS concepts under study.

  20. Trace metallic impurity analysis of Pu bearing nuclear fuels by AES and associated instrumental set up

    International Nuclear Information System (INIS)

    Radiochemistry Division, BARC, has been carrying out trace metal assay of Pu bearing nuclear fuels and associated materials such as UO2, PuO2, (U,Pu)O2, (U,Pu)C etc. based on Atomic Emission Spectrometry (AES) for more than four decades. AES is used with two different excitation sources, i.e. Direct Current Arc (D.C.Arc) and Inductively Coupled Plasma (ICP). In the first case, group of metallics viz. Al, B, Be, Ca, Cd, Co, Cr, Cu, Fe, Li, Mg, Mn, Na, Ni, Pb, Si, Sn, Ta,V, W and Zn are normally determined by carrier distillation technique, wherein during excitation of the sample in D.C.Arc, the analytes get selectively volatilised leaving behind the matrix in the electrode crater. Thus the sample prior to arcing has to be only directly mixed with the carrier, therefore, resulting in minimum handling of sample, which results in least chance of contamination and greater speed of analysis

  1. Spectroscopy Division: progress report for 1990

    International Nuclear Information System (INIS)

    This report summarises the work done by members of the Spectroscopy Division both within BARC as well as in scientific institutions elsewhere during the calendar year 1990. Main areas of research activity include atomic spectroscopy for hyperfine structure and isotope shift determination, theoretical and experimental studies of diatomic molecules, infrared and Raman spectroscopy of polyatomic molecules, design and fabrication of beam line optics for INDUS-I synchrotron radiation source, beam foil spectroscopy and laser spectroscopy of various atomic and molecular systems. Major experimental facilities that have been utilised include a fourier transform spectrometer, an excimer laser pumped dye-laser and a continous wave argon-ion laser. The report also includes the spectroscopic analytical service rendered for various DAE units and describes briefly some new analytical facilities like laser enhanced ionization in flames and resonance ionization mass spectroscopy using pulsed lasers which are being set up. The above activites were reported by members of the Spectroscopy Division via invited lectures, papers presented in various national and international conferences and publication in scientific journals. Details of these are given at the end of the report. (author). figs., tabs

  2. Quantum remnants of absorptive bistability in the attojoule regime

    CERN Document Server

    Kerckhoff, Joseph; Mabuchi, Hideo

    2010-01-01

    Current approaches to high spatial-density, ultra-low power photonic switching utilize optical resonators with small mode-volume and high quality-factor to enhance the effective nonlinearity of bulk materials such as Si \\cite{Yang07} or InGaAsP \\cite{Noza10,Kuma10}. Such resonators likewise play a crucial role in cavity QED research with single emitters such as quantum dots \\cite{Srin07,Fara08} or diamond nv-centers \\cite{Barc09,Engl10}. Whereas atomic and solid-state cavity QED experiments are routinely analyzed using quantum models, research aimed towards switching applications typically employs classical electromagnetic methods to model nanophotonic versions of the bistability and hysteresis phenomena that have dominated optical computer engineering since the 1970s \\cite{Smit86}. Classical optical models are ultimately incompatible with the technological goal of low switching energy, however, as the characteristic scale of one attojoule corresponds to $\\lesssim 10$ photons at near-infrared wavelengths. Her...

  3. Report of the Solid State Physics Division (1991-1992)

    International Nuclear Information System (INIS)

    This report summarizes the activities carried out in the Solid State Physics Division at Bhabha Atomic Research Centre (BARC) covering the period from 1991-1992. The activities are reported in the form of individual summaries arranged under headings: Research Activities, Instrumentation and Software Development. The main research activity of the Division is centered around the utilisation of the neutron beams at the Dhruva and Cirus reactors. A number of research proposals from the universities, funded by the Inter University Consortium come under the category of powder diffraction studies. Another area of research where there is a good demand from universities is in the field of small angle neutron scattering. In addition to the neutron beam research, a number of other investigations pertaining to Raman scattering, liquid crystals, model membranes, magnetism, protein crystallography etc. have contributed significantly to the research programme. The fully indigenous guide laboratory is expected to become operational soon. A list of published papers, internal reports and submitted theses is given at the end. (author). refs., figs., tabs

  4. Quench analysis of 4-Tesla superconducting solenoid magnet using numerical methods

    International Nuclear Information System (INIS)

    Superconducting (SC) magnets are used in accelerators, high energy physics, material science studies, modalities such as MRI etc. 4 Tesla warm bore superconducting magnet is being constructed at BARC in . The superconducting magnet will be used for corrosion and Magneto hydro dynamic studies related to the development of Lead Lithium cooled ceramic breeder (LLCB) test blanket module. The complete magnet will be immersed in a liquid Helium bath at 4.2 K. The transition of SC magnet's operating point from superconducting state to normal conducting state is known as quench. During normal operation, the magnet will be storing 2.6 MJ of energy which needs to be dissipated rapidly in the form of heat energy at the time of quench. Uncontrolled quench is catastrophic in nature which may even lead to melt down of windings, punching holes through insulation etc. The possible reasons for quench are lack of stability (design mistakes), transients, conductor movement, resin cracking etc. A quench protection program is written in COMSOL Multiphysics along with nonlinear resistivity module implemented in PYTHON which attempts to estimate the quench parameters tor 4-Tesla SC Magnet. This paper discusses the intrinsic quench behavior along with quench parameters (thermal stability limit of SC magnet in terms of MQE, quench propagation velocity, inter layer voltages) of the SC magnet. (author)

  5. Photoproduction of $J/\\psi$ in association with a $c\\bar{c}$ pair

    CERN Document Server

    Li, Rong

    2009-01-01

    Based on the color-singlet model, we investigate the photoproduction of $J/\\psi$ associated with a $c \\bar{c}$ pair with all subprocesses including the direct, single-resolved, and double-resolved channels. The amplitude squared of these subprocesses are obtained analytically. By choosing corresponding parameters, we give theoretical predictions for the $J/\\psi$ transverse momentum distributions both at the LEPII and at the future photon colliders for these subprocesses. The numerical results show that at the LEPII these processes can not give enough contributions to account for the experimental data, and it indicates that the color-octet mechanism may still be needed. At the photon collider with the laser back scattering photons, the resolved photon channe will dominate over the direct one in small and moderate $p_t$ regions with large $\\sqrt{s}$. By measuring the $J/\\psi$ production associated with a $c\\bar{c}$ pair, this process can be separated from the inclusive $J/\\psi$ production and may provide a new ...

  6. Positive Parity $D_s$ Mesons

    Energy Technology Data Exchange (ETDEWEB)

    Leskovec, Luka [Stefan Inst., Ljubljana; Lang, C. B. [Graz U.; Mohler, Daniel [Fermilab; Prelovsek, Sasa [Stefan Inst., Ljubljana; Woloshyn, R. M. [TRIUMF

    2015-11-12

    We study the positive parity charmed strange mesons using lattice QCD, the only reliable ab initio method to study QCD at low energies. Especially the experimentally observed $D_{s0}^*(2317)$ and $D_{s1}(2460)$ have challenged theory for quite some time. The dynamical lattice QCD simulations are performed at two distinct pion masses, $m_{\\pi}$ = 266 MeV and 156 MeV, using both $\\bar{c}s$ as well as $DK$ and $D^*K$ scattering operators in the construction of the correlation matrix in order to take into the account threshold effects. While the $J^P = 0^+$ channel benefited most from the inclusion of scattering operators, it was also crucial for the case of the $D_{s1}(2460)$. Using the L\\"uscher method, which relates the finite volume spectrum to the infinite volume scattering matrix, we were able to determine the near threshold behavior of the scattering amplitude. From it we extracted the binding momenta and the masses of the below-threshold bound states $D_{s0}^*(2317)$ and $D_{s1}(2460)$ by determining the pole positions of the scattering amplitudes. Our results compare well with experiment, resolving a long standing discrepancy between theory and experiment.

  7. Temperature effects on the structure of liquid D-methanol through neutron diffraction

    Indian Academy of Sciences (India)

    A Sahoo; S Sarkar; P S R Krishna; R N Joarder

    2004-08-01

    The study of changes in the structure (H-bonded) of liquid alcohols at elevated temperatures is rare probably due to low flash points of these liquids. An indigenously devised special quartz cell is now used to carry out the structural studies of these liquids at elevated temperatures through neutron diffraction. Here, the liquid consists of deuterated methanol and neutron data was collected on the high- diffractometer at Dhruva, BARC. The corrected data at elevated temperatures (BP (boiling point) and double the BP) show that there is a large change in the H-bonded structure of this liquid. The pre-peak or hump, known to be signature of H-bonded clusters appears to be present at all the three temperatures studied. In the low- (scattering vector) data Ornstein-Zernike (OZ) behaviour is also observed. It is, however, seen that the intramolecular structure does not change very much at higher temperatures. A detailed model analysis is in progress and would be reported later.

  8. Environmental radiological aspects of mining and processing of beach sand minerals: regulatory perspective

    International Nuclear Information System (INIS)

    The coastal sands of India have large reserves of valuable minerals namely titanium bearing minerals (ilmenite, rutile, leucoxene), zircon, garnet, sillimanite and monazite (which is a source of thorium and uranium). In 1998, a Policy on Exploitation of Beach Sand Minerals (BSM) was notified by the Government of India in 1998 which encouraged the participation of companies outside Department of Atomic Energy in the field of beach sand mining and mineral separation. Since the beach sand minerals remain invariably associated with the radioactive mineral monazite, preferential separation of other heavy minerals results in enhancement of the monazite content in the left over sands generally referred to as tailings. Atomic Energy Regulatory Board took an independent assessment of all these facilities and a special Committee was constituted in 2004 with experts from AERB and BARC to evaluate the radiological safety aspects in these facilities. AERB evaluates the design of engineered trenches for storage of radioactive solid wastes, treatment methodology of gaseous and liquid wastes and prescribes limits on the activity content and quantity of gaseous, liquid and solid wastes such that there is no adverse impact on the environment. Independent Environmental Survey Laboratories of Bhabha Atomic Research Centre are stationed at these sites to carry out periodic surveillance of the surrounding environment, which includes bore well monitoring, environmental radiation monitoring, air, water, soil, and vegetation sample analysis. AERB reviews the periodic reports of ESL to assess the radiological impact from these facilities

  9. Radiochemistry Division: annual progress report for 1980

    International Nuclear Information System (INIS)

    The research and development (R and D) activities of the Radiochemistry Division of the Bhabha Atomic Research Centre (BARC), Bombay, during 1980 are reported in the form of individual summaries under the headings: reactor chemistry, heavy element chemistry, process chemistry (of actinides), nuclear chemistry and instrumentation. Some of the highlights of the R and D activities are: (1) setting up of the facilities for the prepa.ration of (U,Pu)O2 microspheres by sot-gel process on laboratory scale, (2) studies on synergistic extraction of Am, Cm, Bk, Cf, Th(IV), Np(IV) and Pu(IV) with mixtures of TTA and oxodonor6s like TBP, (3) kinetics of radiation induced oxidation of Pu(IV) and that of reduction of Pu(VII), (4) determination of fission yields of 138Xe, 139Cs, 252Cf and 229Th, (5) measuring of gamma ray abundance of 229Th and isotopic ratios in thorium and plutonium and (6) design and fabrication of an osmistor for the determination of the molecular weight of actinide complexes. A list of papers published in journals and papers presented at conference/symposia during the year is also given. (M.G.B.)

  10. Study on meteorological parameters during pre-monsoon period at Trombay for environmental impact predictions

    International Nuclear Information System (INIS)

    Bhabha Atomic Research Centre, Trombay site is characterized by complex topography with approximately 330 meter hill at one side and the Arabian Sea at the other which at the eastern coast of Mumbai. A research reactor (DHRUVA) is located in the almost central part of the BARC site. During the operation of research reactor, it gives rise to the formation of fission product noble gases (FPNGs) and other radionuclides but are retained in the fuel matrix itself. Any minor defects in the fuel matrix may lead to the release of the activity to the environment after the filtration through the bank of the High Efficiency Particulate Activity (HEPA) filters. The various reactor components like shut off rods, pneumatic carrier facilities etc. are cooled by processed air that leads to the formation of activation products like 41Ar, which is discharged through the elevated stack. In case of release of gaseous radioactive effluents to the environment though much below permissible limits, exposure to the public may occur by various pathways. External exposure occurs during the passage of the radioactive plume. The doses at different locations due to dispersion of the released gaseous effluent activity can vary depending on the meteorological conditions and effect of topography. In order to estimate the public exposures due to the plume dispersion, the meteorological parameters like wind speed, wind direction and stability category are essential. The paper presents the conclusions from meteorological data for two consecutive years (2012-2013) for Trombay, Mumbai

  11. Multifunctional hardmask neutral layer for directed self-assembly (DSA) patterning

    Science.gov (United States)

    Guerrero, Douglas J.; Hockey, Mary Ann; Wang, Yubao; Calderas, Eric

    2013-03-01

    Micro-phase separation for directed self-assembly (DSA) can be executed successfully only when the substrate surface on which the block co-polymer (BCP) is coated has properties that are ideal for attraction to each polymer type. The neutral underlayer (NUL) is an essential and critical component in DSA feasibility. Properties conducive for BCP patterning are primarily dependent on "brush" or "crosslinked" random co-polymer underlayers. Most DSA flows also require a lithography step (reflection control) and pattern transfer schemes at the end of the patterning process. A novel multifunctional hardmask neutral layer (HM NL) was developed to provide reflection control, surface energy matching, and pattern transfer capabilities in a grapho-epitaxy DSA process flow. It was found that the ideal surface energy for the HM NL is in the range of 38-45 dyn/cm. The robustness of the HM NL against exposure to process solvents and developers was identified. Process characteristics of the BCP (thickness, bake time and temperature) on the HM NL were defined. Using the HM NL instead of three distinct layers - bottom anti-reflective coating (BARC) and neutral and hardmask layers - in DSA line-space pitch tripling and contact hole shrinking processes was demonstrated. Finally, the capability of the HM NL to transfer a pattern into a 100-nm spin-on carbon (SOC) layer was shown.

  12. Assessment of radiation shield integrity of DD/DT fusion neutron generator facilities by Monte Carlo and experimental methods

    International Nuclear Information System (INIS)

    DD/DT fusion neutron generators are used as sources of 2.5 MeV/14.1 MeV neutrons in experimental laboratories for various applications. Detailed knowledge of the radiation dose rates around the neutron generators are essential for ensuring radiological protection of the personnel involved with the operation. This work describes the experimental and Monte Carlo studies carried out in the Purnima Neutron Generator facility of the Bhabha Atomic Research Center (BARC), Mumbai. Verification and validation of the shielding adequacy was carried out by measuring the neutron and gamma dose-rates at various locations inside and outside the neutron generator hall during different operational conditions both for 2.5-MeV and 14.1-MeV neutrons and comparing with theoretical simulations. The calculated and experimental dose rates were found to agree with a maximum deviation of 20% at certain locations. This study has served in benchmarking the Monte Carlo simulation methods adopted for shield design of such facilities. This has also helped in augmenting the existing shield thickness to reduce the neutron and associated gamma dose rates for radiological protection of personnel during operation of the generators at higher source neutron yields up to 1 × 1010 n/s

  13. Experimental studies on in-bundle ECCS injection for Advanced Heavy Water Reactor

    International Nuclear Information System (INIS)

    The Advanced Heavy Water Reactor (AHWR) being designed at BARC is an innovative reactor with Thorium utilization as its major objective. It has many advanced passive safety features. One such feature is passive injection of emergency coolant after postulated Loss of Coolant Accident (LOCA). A novel feature of this injection scheme is that the injection does not take place in the header/plenum as in other reactors, but directly in to the bundle. For this purpose, the fuel cluster incorporates a central water rod which communicates with the ECCS header. The water rod extends along full length of the fuel cluster. In event of LOCA in the Main Heat Transport (MHT) system, ECC water flows from the accumulator to the water rod through ECCS header. The water flows into the bundle through holes in the water rod. The AHWR fuel cluster has fuel pins arranged in three concentric rings (of 12, 18 and 24 pins) around the central rod. While it is ensured that water does reach the fuel cluster, whether it reaches the outer ring of pins is needs investigation as the pins are closely spaced (1-3 mm gap between adjacent rods). The objective of the present experiments is to determine under what conditions (ECC flow and decay heat), the ECC water is able to rewet and cool all the fuel pins. The experiments have been done in a short, instrumented fuel bundle simulating the geometry of the AHWR fuel cluster

  14. RF properties of 700 MHz, = 0.42 elliptical cavity for high current proton acceleration

    Indian Academy of Sciences (India)

    Amitava Roy; J Mondal; K C Mittal

    2008-12-01

    BARC is developing a technology for the accelerator-driven subcritical system (ADSS) that will be mainly utilized for the transmutation of nuclear waste and enrichment of U233. Design and development of superconducting medium velocity cavity has been taken up as a part of the accelerator-driven subcritical system project. We have studied RF properties of 700 MHz, = 0.42 single cell elliptical cavity for possible use in high current proton acceleration. The cavity shape optimization studies have been done using SUPERFISH code. A calculation has been done to find out the velocity range over which this cavity can accelerate protons efficiently and to select the number of cells/cavity. The cavity's peak electric and magnetic fields, power dissipation c, quality factor and effective shunt impedance 2 were calculated for various cavity dimensions using these codes. Based on these analyses a list of design parameters for the inner cell of the cavity has been suggested for possible use in high current proton accelerator.

  15. Environmental monitoring around nuclear power plant sites

    International Nuclear Information System (INIS)

    The environmental monitoring around nuclear power plant sites is presented. The basic policy that no part of the ecosystem should be subjected to excessive (above natural) radiation exposure is realized by predictive methodology of environmental and dosimetric models. The validation of these models is achieved through environmental monitoring around nuclear power plant sites right from the pre-operational period through operational phase. The 'potential contaminated media' are monitored in pre-operational phase. The measurements carried out in the environmental matrices for assessment of the impact on the population demonstrate that the objectives of the Department of Atomic Energy are fully realized. These activities are carried out at each nuclear power plant site by establishing an Environmental Survey Laboratory, which operates under the administrative and technical control of the Health Physics Division of BARC. This arrangement ensures independence from the operating organisation and better public acceptance of data generated. The results of environmental monitoring indicate that the radiation dose received by members of the public is well below the regulatory limits. (author)

  16. Temporal distribution of tritium in the atmospheric environment of Mumbai

    International Nuclear Information System (INIS)

    Atmospheric Tritium level in the air moisture around Mumbai was estimated at several locations covering a radial distance of 20 km from the discharge point of CIRUS at BARC. Samples were collected by cold finger method from selected locations at 1 meter above ground level from 1.6 km to 20 km radial distance over a period of 3 years 2007-2009; during pre-monsoon, monsoon and post-monsoon seasons. Tritium was estimated in the air moisture by Ultra Low level Liquid Scintillation Spectrometer. The minimum detectable limit for the air moisture samples was 0.02 Eq/m3. Air tritium level was found to be maximum at the nearby locations during monsoon. However, during post-monsoon season the levels were higher at distances >3 km. In general, tritium level in the atmospheric air was in the range of 0.02-2.29 Bq/m3. The dose due to inhalation was observed to be in the range of 8.66E-8 to 9.9E-6 Sv/y which is very much lower than the prescribed limit. (author)

  17. Positive parity $D_s$ mesons

    CERN Document Server

    Leskovec, Luka; Mohler, Daniel; Prelovsek, Sasa; Woloshyn, R M

    2015-01-01

    We study the positive parity charmed strange mesons using lattice QCD, the only reliable ab initio method to study QCD at low energies. Especially the experimentally observed $D_{s0}^*(2317)$ and $D_{s1}(2460)$ have challenged theory for quite some time. The dynamical lattice QCD simulations are performed at two distinct pion masses, $m_{\\pi}$ = 266 MeV and 156 MeV, using both $\\bar{c}s$ as well as $DK$ and $D^*K$ scattering operators in the construction of the correlation matrix in order to take into the account threshold effects. While the $J^P = 0^+$ channel benefited most from the inclusion of scattering operators, it was also crucial for the case of the $D_{s1}(2460)$. Using the L\\"uscher method, which relates the finite volume spectrum to the infinite volume scattering matrix, we were able to determine the near threshold behavior of the scattering amplitude. From it we extracted the binding momenta and the masses of the below-threshold bound states $D_{s0}^*(2317)$ and $D_{s1}(2460)$ by determining the ...

  18. Calibration coefficient of reference brachytherapy ionization chamber using analytical and Monte Carlo methods.

    Science.gov (United States)

    Kumar, Sudhir; Srinivasan, P; Sharma, S D

    2010-06-01

    A cylindrical graphite ionization chamber of sensitive volume 1002.4 cm(3) was designed and fabricated at Bhabha Atomic Research Centre (BARC) for use as a reference dosimeter to measure the strength of high dose rate (HDR) (192)Ir brachytherapy sources. The air kerma calibration coefficient (N(K)) of this ionization chamber was estimated analytically using Burlin general cavity theory and by the Monte Carlo method. In the analytical method, calibration coefficients were calculated for each spectral line of an HDR (192)Ir source and the weighted mean was taken as N(K). In the Monte Carlo method, the geometry of the measurement setup and physics related input data of the HDR (192)Ir source and the surrounding material were simulated using the Monte Carlo N-particle code. The total photon energy fluence was used to arrive at the reference air kerma rate (RAKR) using mass energy absorption coefficients. The energy deposition rates were used to simulate the value of charge rate in the ionization chamber and N(K) was determined. The Monte Carlo calculated N(K) agreed within 1.77 % of that obtained using the analytical method. The experimentally determined RAKR of HDR (192)Ir sources, using this reference ionization chamber by applying the analytically estimated N(K), was found to be in agreement with the vendor quoted RAKR within 1.43%.

  19. Genetic analysis of fertility restoring genes for AL-type male sterility in wheat

    Institute of Scientific and Technical Information of China (English)

    Liu Xiaofang; Tian Xiaoming; Nie Yingbin; Mu Peiyuan; Han Xinnian; Sang Wei; Cui Fengjuan; Xu Hongjun; Xiang Jishan

    2013-01-01

    In order to screen molecular markers linked to fertility restoring genes and further improve the breeding efficiency of restorer lines,in this study,wheat varieties 18A,18B and 99AR144-1 were used as experimental materials to establish F2 fertility-segregating population. Plant quantitative trait“major gene+polygene mixed mo-del”separation analysis method and simple sequence repeat (SSR) molecular markers were adopted for genetic analysis of four generations,including the parents (P1 and P2),and hybrid (Fl and F2) populations. The results show that AL-type fertility restoring gene is controlled by two pairs of additive-dominant-epistatic genes and addi-tive-dominant polygene;two primers linked to fertility restoring genes were selected by SSR molecular markers, including Xgwm95 on chromosome 2A and Barc61 on chromosome 1B,with the linkage distance of 15.0 cM and 18.0 cM,respectively. Based on verification,these two markers are reliable for distinguishing AL-type wheat ste-rile lines and restorer lines.

  20. Safety and regulatory aspects of radiation processing facilities in India

    International Nuclear Information System (INIS)

    The number of gamma and electron radiation processing facilities (RPFs) is increasing all over the world. This is mainly due to their multifarious applications in the field of medicine, industry, agriculture and research. The most wide spread use of these facilities are for sterilisation of medical and pharmaceutical products, preservation of food stuffs, polymer synthesis and modifications, eradication of insect infestation and in the management of public health and environment. In India, at present, a total of nineteen gamma radiation-processing facilities (GRAPFs) are under operation for various purposes, four are under construction and several facilities have obtained site clearance for installation of GRAPF. There are five radiation processing accelerator (RPA) facilities operating in the country for other than food irradiation purposes. The ISOMED, the first commercial gamma radiation processing plant for sterilisation of medical products was commissioned at the Bhabha Atomic Research Centre (BARC), Mumbai in 1974 by the Department of Atomic Energy (DAE), Government of India. The regulatory controls have been briefly outlined in this article

  1. Deformation Behaviour of Coarse Grain Alumina under Shock Loading

    Science.gov (United States)

    Gupta, Satish

    2013-06-01

    To develop better understanding of the shock wave induced deformation behavior of coarse grain alumina ceramics, and for measurement of its Hugoniot Elastic Limit (HEL), in-situ and recovery gas gun experiments have been carried out on coarse grain alumina (grain size ~ 10 μm), prepared in the form of discs (>99.9% TMD) by pressure-less sintering of alpha alumina powder at 1583 K. The HEL value of 1.9 GPa has been determined from the kink in the pressure history recorded using piezoresistance gauge and also from the free surface velocity history of the sample shocked to 9 GPa. The nano-indentation measurements on the alumina samples shocked to 6.5 GPa showed hardness value 15% lower than 21.3 GPa for unshocked alumina, and strong Indentation Size Effect (ISE); the hardness value was still lower and the ISE was stronger for the sample shocked to 12 GPa. The XRD measurements showed reduced particle size and increased microstrains in the shocked alumina fragments. SEM, FESEM and TEM measurements on shock treated samples showed presence of grain localized micro- and nano-scale deformations, micro-cleavages, grain-boundary microcracks, extensive shear induced deformations, and localized micro-fractures, etc. These observations led to the development of a qualitative model for the damage initiation and its subsequent growth mechanisms in shocked alumina. The work performed in collaboration with K.D. Joshi of BARC and A.K. Mukhopadhyay of CGCRI.

  2. Conceptual design of a pool type molten salt breeder reactor

    International Nuclear Information System (INIS)

    The renewed interest in molten salt coolant technology is backed by the 50 years history of molten salt nuclear technology development, mainly in Oak Ridge National Laboratory (ORNL). In Indian context MSBR is found to be one of the options for sustainable nuclear energy generation, especially in the third stage of the nuclear programme. The system can be operated at high temperature which makes high efficiency power conversion and efficient hydrogen generation through thermo-chemical reactions possible. At present development is in progress in BARC on two molten salt reactor concepts, one is pool type and the other is loop type. Here the design of pool type concept with 850MWe power is described. The core is designed to operate in the fast spectrum region so the conversion of 233U breeding is possible from thorium. Preliminary thermal hydraulic analysis is carried out with LiF-ThF4-UF4 as the primary fuel and coolant. The blanket material is also a molten salt, LiF-ThF4. Reactor physics calculations are also carried out for the feasibility studies of the core design of the reactor. FLiNaK is used as the secondary coolant for the calculations. Both forced circulation and natural circulation options are evaluated. (author)

  3. Nuclear Medicine Therapy : Current Status and Future Prospects

    Directory of Open Access Journals (Sweden)

    S.M. Sharma

    1990-10-01

    Full Text Available Radioisotope therapy began in 1942 with the use of /sup 131/I for Graves disease and /sup 32/P for polycythemia vera. Local therapy with radioisotopes includes radiocolloids for malignant pleural and peritoneal effusions, intra-articular radiocolloids for chronic synovitis, intra-arterial radioactive microsphere for liver metastases, and intralymphatic administration for malignancies of the lymphatic system. The most widely practised use of radioisotopes for therapy is for the management of hyperthyroidism by /sup 131/I. Each school has developed its own treatment schedule for controlling the disease without producing too unacceptable an incidence of late hypothyroidism. /sup 131/I is also being used effectively for thyroid cancer, particularly at the Radiation Medicine Centre, BARC. There is hope that a new generation of radiolabelled compounds is round the corner for therapy. As in the case of radiopharmaceuticals for diagnosis, the shift has been from simple inorganic compounds to tailored organic ones. Radiolabelled monoclonal antibodies aimed against specific tumour antigens have already shown great promise. Another area of interest is the use of minute lipid spheroids (vesicles enclosing the radioactive drug which can be targeted to the tumour.

  4. Management of radioactive waste from reprocessing plants

    International Nuclear Information System (INIS)

    Reprocessing and recycling of both fissile and fertile components back into appropriate reactor systems is an integral part of three stage nuclear energy programme of India. Different steps involved in processing of spent nuclear fuel (SNF) are decladding, dissolution and recovery of fissile and fertile materials. Reprocessing of SNF is a complex process involving handling of large quantity of radioactive materials and processing chemicals. There are three reprocessing plants in operation in the country at Trombay, Tarapur and Kalpakkam. Out of these plants, Trombay reprocessing plant is engaged in reprocessing of SNF from research reactors and other two plants are processing of SNF from PHWRs. A facility is being built for reprocessing of thorium based spent fuel at BARC, Trombay based on the experience of pilot plant scale. Like other industrial activities of nuclear fuel cycle, fuel reprocessing facilities too generate various types of radioactive waste streams. These are generated in all the three physical forms namely solid, liquid and gas. These waste streams are primarily categorized on the basis of concentration of radionuclides, their half lives and toxicity. Management of these wastes aims at (a) recovery and recycle of useful materials, (b) concentration and confinement of radioactivity in inert and stable matrices, (c) minimization of final waste volume for disposal, (d) decontamination of effluents following ALARA principle and (e) minimization of radioactive discharge to the environment. The present paper outlines the salient features of management of different types of radioactive waste generated in reprocessing plants handling SNF from research reactors and PHWR

  5. (Coordinated research of chemotherapeutic agents and radiopharmaceuticals)

    Energy Technology Data Exchange (ETDEWEB)

    Srivastava, P.C.

    1991-01-14

    The traveler received a United Nations Development Program (UNDP) Award for Distinguished Scientists to visit Indian Research Institutions including Central Drug Research Institute (CDRI), Lucknow, the host institution, in cooperation with the Council of Scientific and Industrial Research (CSIR) of India. At CDRI, the traveler had meetings to discuss progress and future directions of on-going collaborative research work on nucleosides and had the opportunity to initiate new projects with the divisions of pharmacology, biopolymers, and membrane biology. As a part of this program, the traveler also visited Sanjay Gandhi Post Graduate Institute (SGPI) of Medical Sciences, Lucknow; Board of Radiation and Isotope Technology (BRIT) and Bhabha Atomic Research Center (BARC), Bombay; Variable Energy Cyclotron Center (VECC) and Indian Institute of Chemical Biology, Calcutta. He also attended the Indo-American Society of Nuclear Medicine Meeting held in Calcutta. The traveler delivered five seminars describing various aspects of radiopharmaceutical development at the Oak Ridge National Laboratory (ORNL) and discussed the opportunities for exchange visits to ORNL by Indian scientists.

  6. Fabrication of reactor control and shut off assemblies

    International Nuclear Information System (INIS)

    Atomic Fuels Division (AFD), BARC has been engaged nearly for the last two decades in the development and fabrication of power reactor shut off and control assemblies such as control blades for TAPS, shut off Elements for Dhruva, primary and secondary shut off systems for 220 MWe PHWRs, development of shut off elements for 500 MWe reactors etc. Each control/shut off assembly consists of several sub assemblies. Hardware used is mainly in form of seamless or seam welded tubes in zircaloy-2 or SS 304L. Almost all assemblies are long in length ranging from 4 mtr to 6 mtr, wall thickness varying from less than 1 mm to 1.5 mm and dia from 5 mm to 90 mm. Electron beam welding and TIG welding processes are extensively used in the fabrication. Development work was carried out at AFD on standardizing fabrication routes, design and fabrication of welding fixtures, optimisation of welding parameters, weld qualification procedures etc. Welds were made to meet ASME codes and specified design drawing specifications. Fabrication of assemblies was carried out with constant co-ordination between the designers and user (NPC), material suppliers (NFC) and fabricators (AFD). Several changes made by designer had to be incorporated in subsequent fabrication. Some of the specifications had to be reviewed and revised taking into account the functional requirements and fabrication limitations. In this paper work related to fabrication of these special assemblies with emphasis on welding is presented. (author)

  7. A laser beam welding facility for sealing of miniature radiation sources

    International Nuclear Information System (INIS)

    Full text: A Nd : YAG laser welding facility was installed in a radioactive laboratory of the Radiopharmaceuticals Division, BARC to obtain high quality welds of the titanium encased radiation sources. Radiation sources based on 125I for the treatment of ocular tumors were developed and titanium capsules as specified by IS0 standards were fabricated. The inner core of the tiny sources were prepared and were sealed in titanium capsules of dimensions O.8mm (φ) x 4.5mm (1) by laser welding. The laser beam parameters such as energy, frequency, pulse duration and welding speed were optimized to obtain leak proof welds. Laser welds were also characterized by optical and scanning electron microscopy for assessing its quality. The welded sources showed a total release 125I, which is well below the permissible levels. In this paper we describe the laser welding set up and results of initial development work. We also share our experience to obtain radioactive leak proof laser welding of the 125I sources in titanium capsules

  8. Development of liquid scintillation based 4πβ(LS)-γ coincidence counting system and demonstration of its performance by standardization of ⁶⁰Co.

    Science.gov (United States)

    Kulkarni, D B; Anuradha, R; Joseph, Leena; Tomar, B S

    2013-02-01

    A single-vial, single-PMT 4πβ(LS)-γ coincidence counting system has been developed at the Radiation Safety Systems Division, BARC. It has advantages of simple sample preparation, higher counting efficiency and the absence of self absorption over the conventional proportional counter based 4πβ(PC)-γ coincidence counting system. The performance of the system is demonstrated by standardizing a (60)Co solution using the 4πβ(LS)-γ coincidence counting system, 4πβ(PC)-γ coincidence counting system and CIEMAT/NIST method and comparing the results obtained by each method. The detection efficiency of liquid scintillation counter of the 4πβ(LS)-γ coincidence counting system was varied by color quenching, by chemical quenching and by varying the bias voltage applied to the LSC PMT. For the proportional counter based 4πβ(PC)-γ coincidence counting system the detection efficiency was varied by source self absorption. The activity concentrations obtained using the 4πβ(LS)-γ coincidence counting system, the 4πβ(PC)-γ coincidence counting system and the CIEMAT/NIST method are comparable within the uncertainty limits.

  9. Limulus test for pyrogens and radiometric sterility tests on radiopharmaceuticals. Part of a coordinated programme

    International Nuclear Information System (INIS)

    Sterility testing of radiopharmaceuticals prepared at BARC were carried out using the radiometric technique (Radiometric detection of the metabolic product 14Co2). Batches of different radiopharmaceuticals were tested for pyrogen using the limulus lysate method and the results were compared with the rabbit method. The results of sterility test on 202 batches of 19 different radiopharmaceuticals show that the radiometric method can be used for sterility testing of radiopharmaceuticals labelled with 35S, 51Cr, 57Co, 59Fe, 82Br, 86Rb, sup(99m)Tc, sup(113m)In, 125I and 169Yb. The radiometric test proves to be more rapid than the conventional one for the sterility testing of such radiopharmaceuticals. Detection time is between 6-21 hours. In the case of 131I-labelled radiopharmaceuticals and in the case of chlormerodrin-Hg-203, it was found an interference due to volatile species (sup(131m)Xe in the case of 131I and some volatile mercury form in the case of chlormerodrin). In these cases it would be possible to carry out the radiometric sterility test after separation of the microorganisms from the radioactive material (by filtration). The limulus lysate method can be employed for control of various pyrogen-prone raw materials and radiopharmaceuticals. Such method is the only method at present available for detecting the low level pyrogen contamination in intrathecal injections. The limulus test is more rapid than the rabbit test

  10. X-ray emission from highly stripped 32S ions channeled along axis in Si

    International Nuclear Information System (INIS)

    We have started the investigations of projectile X-ray yields for fully stripped 32S ions incident along the direction in a thin (0.2μm) Si single crystal. Different charge states of 32S ions like 13+, 14+, 15+, 16+ were obtained by passing 32S8+-10+ beam, from the TIFR-BARC 14UD pelletron accelerator, through a 8-10μg/cm2 carbon foil post-stripper. The charge state of the emerging ions was selected with the help of a 30deg beam switching magnet. A thin gold foil was placed downstream and the elastically scattered 32S ions from this gold foil were detected and used for the normalization. Both the target and projectile X-ray were detected by a Si(Li) detector kept at 20deg to the beam direction. It is observed K X-ray emission shows weaker channeling. This indicates that the impact parameters involved in the process is large (by a factor of ≅ √2) as compared to that in the target K X-ray emission. (author). 2 figs

  11. Experiences of conventional pretreatment system in SWRO plant at Kalpakkam

    International Nuclear Information System (INIS)

    Seawater reverse osmosis plant (SWRO) at Kalpakkam, Tamilnadu was commissioned in October 2002. It is a part of Nuclear Desalination Demonstration Project (NDDP) undertaken by the BARC, Department of Atomic Energy. The capacity of the plant is 1800 m3/d. The preteatment of this membrane desalination is conventional one, consists of lamella clarifier, pressurized sand filter, activated carbon filter and cartridge filter. The dosing of pretreatment chemicals like ferrous sulphate, polyelectrolyte is to be optimum to keep the SDI value around 3-4, which will extend the membrane life. A series of experimental trials were conducted about the dosing of chemicals and it was found that at particular minimum turbidity levels, no dosing of chemicals are required. Similarly the dosing of proprietary antiscalant chemicals instead of sodium hexa-meta phosphate to control the sulphate scaling did not affect the process performance. Rather it helped the operation as the anti-scalant is in liquid form and the addition of hydrochloric acid (which is otherwise required to prevent carbonate scaling is avoided). The harmful acid handling is eliminated and the overall cost per unit water production has come down. (author)

  12. Nuclear energy for seawater desalination - options in future

    International Nuclear Information System (INIS)

    Full text: With ever increasing water scarcity, many alternatives are being tried to supplement the existing water resources. There are regions where water is scarce and population is growing and is at the mercy of inadequate supplies. Seawater constitutes a practically unlimited source of saline water. When desalted, it can augment the existing potable water resources for the people in nearby area and also meet the increasing demand. BARC has been engaged in the field of desalination and developed expertise in both thermal and membrane technologies. It has setup 6300 M3/D Nuclear Desalination Demonstration Project (NDDP) at Kalpakkam, where both membrane and thermal technologies have been used for sea water desalination. Desalination process needs energy and nuclear energy is strong option in view of limited fossil fuels and environmental concerns. Multi Stage Flash (MSF) plant based on thermal technology has been coupled to MAPS Reactors and Sea Water Reverse Osmosis (SWRO) plant is based on membrane technology. This paper discusses various aspects of coupling of desalination plant with nuclear reactors and also discusses salient features of hybridization of thermal and membrane technologies

  13. Assessment of radiation shield integrity of DD/DT fusion neutron generator facilities by Monte Carlo and experimental methods

    Science.gov (United States)

    Srinivasan, P.; Priya, S.; Patel, Tarun; Gopalakrishnan, R. K.; Sharma, D. N.

    2015-01-01

    DD/DT fusion neutron generators are used as sources of 2.5 MeV/14.1 MeV neutrons in experimental laboratories for various applications. Detailed knowledge of the radiation dose rates around the neutron generators are essential for ensuring radiological protection of the personnel involved with the operation. This work describes the experimental and Monte Carlo studies carried out in the Purnima Neutron Generator facility of the Bhabha Atomic Research Center (BARC), Mumbai. Verification and validation of the shielding adequacy was carried out by measuring the neutron and gamma dose-rates at various locations inside and outside the neutron generator hall during different operational conditions both for 2.5-MeV and 14.1-MeV neutrons and comparing with theoretical simulations. The calculated and experimental dose rates were found to agree with a maximum deviation of 20% at certain locations. This study has served in benchmarking the Monte Carlo simulation methods adopted for shield design of such facilities. This has also helped in augmenting the existing shield thickness to reduce the neutron and associated gamma dose rates for radiological protection of personnel during operation of the generators at higher source neutron yields up to 1 × 1010 n/s.

  14. Filament power supply for 1 MW, 352.21 MHz klystron

    International Nuclear Information System (INIS)

    The low energy high intensity proton accelerator LEHIPA (20 MeV, 30 mA) is under development in BARC. Three 1 MW, 352.21 MHz RF power sources, based on klystron TH2089F will be developed to power the accelerating cavities of the LEHIPA. The klystron TH2089F operates at filament voltage 18 Volt, 22 A (AC) with filament floating at cathode voltage of -100 kV DC with respect to ground. Hence, a suitable filament supply is developed having voltage regulation of ±1% and slow start voltage ramp up in 15 minutes. This power supply uses SCRs based phase control circuits and closed loop voltage feedback circuits. The input ac phase is initially blocked by two SCRs (connected back to back) which are turned on gradually (in 15 minutes) to limit the surge current of the filament during start up. A 150 kV isolation transformer is used to facilitate floating of filament voltage over -100 kV DC cathode voltage. A simplified firing circuit and use of small number of components have improved the reliability and the performance of the power supply. Voltage regulation of the power supply achieved is ±0.8 % and insulation testing of isolation transformer is performed up to 120 kV DC. (author)

  15. MUON DETECTORS: RPC

    CERN Multimedia

    P. Paolucci

    2013-01-01

    During LS1, the Resistive Plate Chamber (RPC) collaboration is focusing its efforts on installation and commissioning of the fourth endcap station (RE4) and on the reparation and maintenance of the present system (1100 detectors). The 600 bakelite gaps, needed to build 200 double-gap RE4 chambers are being produced in Korea. Chamber construction and testing sites are located at CERN, in Ghent University, and at BARC (India). At present, 42 chambers have been assembled, 32 chambers have been successfully tested with cosmic rays runs and 7 Super Modules, made by two chambers, have been built at CERN by a Bulgarian/Georgian/Italian team and are now ready to be installed in the positive endcap. The 36 Super Modules needed to complete the positive endcap will be ready in September and installation is scheduled for October 2013. The Link-Board system for RE4 is under construction in Naples. Half of the system has been delivered at CERN in June. Six crates (Link-Board Boxes) and 75 boards, needed to instrument t...

  16. Radiotracer applications in environmental contamination studies necessitated by industrialisation

    International Nuclear Information System (INIS)

    Radioisotopes and labelled compounds because of their case of detection at minute amounts have found wide applications in environmental pollution studies. The radioactivation analysis, a powerful nuclear technique has been employed to determine the elemental concentration of various elements which enter the food chain by industrial pollution, such as mercury in fish, bromine in soil after fumigation with methyl bromide, Se etc. Isotopically labelled compounds particularly drugs, pesticides, insecticides, fungicides, weedicides and fertilizers have been applied to study their action and metabolism and to follow their metabolites' entry into food chain. Countless novel applications of carbon-14 labelled polychlorinated biphenyls, DDT analogues, dieldrin, aldrin, endrin etc. are worth mentioning in this context. The present review, after surveying these applications, brings out the importance of making available labelled compounds needed by R and D workers in India and stresses the exploitation of the know-how available in BARC to achieve the same so that the environmental quality of atmosphere can be studied thoroughly and preventive measures taken to control pollution of natural resources. (auth.)

  17. Pest Control Section Biochemical Group, Progress Report 1982-86

    International Nuclear Information System (INIS)

    Reserch efforts in the Pest Control Section, BARC, a continuator of insect sterilization and pest control section of the erstwhile Biology and Agriculture Division, were continued to develop integrated management practices for the control of important insect pests of agricultural and medical importance. Insect pests chosen are, ubiquitous potato tuberworm, a serious pest of potatoes, cotton bollworms with particular reference to spotted bollworms and a mosquito (Culex fatigans), a vector of filariasis. Keeping these insects as targets, research activities have been concentrated in the fields of biological control with parasities, pathogens and sterile insects, sex pheromones and insect plant interaction with a view to integrate pest management programme. Besides, the research activity also encompasses investigations of basic nature in the fields of insect sex pheromones, insect pathology and insect plant interaction. Studies on insect pheromones relate to the modifying influence of abiotic and biotic factors of the environment on pheromone production and perception and the possibility of insect developing resistance to pheromones. Studies in the field of insect plant interaction are directed towards identifying weak links in the insect plant relationship with a view to exploit them for developing control. Basic studies in the field of insect pathology relate to isolation and identification of entomopathogens, source of their pathogenecity, improvement in their virulence and formulation of cheaper and potent microbial insecticides. This report pertains to the period 1982-86. (Orig.). 11 tables, 5 figures

  18. Beam halo studies in LEHIPA DTL

    International Nuclear Information System (INIS)

    The Low Energy High Intensity Proton Accelerator (LEHIPA) project at Bhabha Atomic Research Centre (BARC) consists of a 20 MeV, 30 mA proton linac. The accelerator comprises of a 3 MeV Radio Frequency Quadrupole (RFQ) and a 20 MeV Drift Tube Linac (DTL). In such high intensity accelerators, beam halos are of concern as they not only cause an increase in emittance, but also lead to beam loss and radio activation. We have studied the effect of beam mismatch at the DTL input on halo formation and propagation. The particle core model is used to excite the three envelope eigen modes; the quadrupole mode, the fast mode and the slow mode by giving input beam mismatch. These modes get damped as the beam progresses through the DTL. The damping mechanism is clearly Landau damping and leads to increase in rms emittance of the beam. The evolution of these modes and the corresponding increase in beam emittance and maximum beam extent, as the beam propagates through the DTL, has been studied for different space charge tunes. The halo parameter based on the definition of Allen and Wangler has been calculated. It is seen that beam halos are very important for LEHIPA DTL, even at 20 MeV and leads to emittance and beam size increase and also to beam loss in some cases. The longitudinal halo is present even without mismatch and transverse halos arise in the presence of beam mismatch

  19. Ageing management of instrumentation and control systems for 100 years life of AHWR

    International Nuclear Information System (INIS)

    Currently Nuclear Power Plants are being designed for a life of about 40 years. However, Advanced Heavy Water Reactor (AHWR), being designed by BARC, is intended to have a life of 100 years. Instrumentation and Control (I and C) plays a crucial role in the safe operation of any nuclear reactor. Design of I and C especially for a life of 100 years offers a great deal of challenges. Experience has shown that ageing and obsolescence have the potential to cause the maintainability and operability of I and C systems in Nuclear Power Plants to deteriorate well before the end of plant life. Hence, all ageing effects are to be detected in time and eliminated by repair, upgrading and replacement measures. However since no I and C system can survive such a long life of 100 years, special attention is to be paid in the design to effect easy replacement. Every aspect of design of hardware and software should deal with obsolescence. Design strategies like minimising the amount of cabling by resorting to networked data communication will go a long way in achieving the desired life extension. Hence it is essential that an effective Ageing Management Programme to be established at the very initial stages of design, planning and engineering of I and C systems for AHWR. This will ensure reliable continued operation of I and C systems for 100 years of life. (author)

  20. 1 MeV, 10 kW DC electron accelerator for industrial applications

    Science.gov (United States)

    Nayak, B.; Acharya, S.; Bhattacharjee, D.; Bakhtsingh, R. I.; Rajan, R.; Sharma, D. K.; Dewangan, S.; Sharma, V.; Patel, R.; Tiwari, R.; Benarjee, S.; Srivastava, S. K.

    2016-03-01

    Several modern applications of radiation processing like medical sterilization, rubber vulcanization, polymerization, cross-linking and pollution control from thermal power stations etc. require D.C. electron accelerators of energy ranging from a few hundred keVs to few MeVs and power from a few kilowatts to hundreds of kilowatts. To match these requirements, a 3 MeV, 30 kW DC electron linac has been developed at BARC, Mumbai and current operational experience of 1 MeV, 10 kW beam power will be described in this paper. The LINAC composed mainly of Electron Gun, Accelerating Tubes, Magnets, High Voltage source and provides 10 kW beam power at the Ti beam window stably after the scanning section. The control of the LINAC is fully automated. Here Beam Optics study is carried out to reach the preferential parameters of Accelerating as well as optical elements. Beam trials have been conducted to find out the suitable operation parameters of the system.

  1. Optimization of solenoid based low energy beam transport line for high current H+ beams

    Science.gov (United States)

    Pande, R.; Singh, P.; Rao, S. V. L. S.; Roy, S.; Krishnagopal, S.

    2015-02-01

    A 20 MeV, 30 mA CW proton linac is being developed at BARC, Mumbai. This linac will consist of an ECR ion source followed by a Radio Frequency Quadrupole (RFQ) and Drift tube Linac (DTL). The low energy beam transport (LEBT) line is used to match the beam from the ion source to the RFQ with minimum beam loss and increase in emittance. The LEBT is also used to eliminate the unwanted ions like H2+ and H3+ from entering the RFQ. In addition, space charge compensation is required for transportation of such high beam currents. All this requires careful design and optimization. Detailed beam dynamics simulations have been done to optimize the design of the LEBT using the Particle-in-cell code TRACEWIN. We find that with careful optimization it is possible to transport a 30 mA CW proton beam through the LEBT with 100% transmission and minimal emittance blow up, while at the same time suppressing unwanted species H2+ and H3+ to less than 3.3% of the total beam current.

  2. Beam halo studies in LEHIPA DTL

    Science.gov (United States)

    Roy, S.; Pande, R.; Rao, S. V. L. S.; Krishnagopal, S.; Singh, P.

    2015-11-01

    The Low Energy High Intensity Proton Accelerator (LEHIPA) project at Bhabha Atomic Research Centre (BARC) consists of a 20 MeV, 30 mA proton linac. The accelerator comprises of a 3 MeV Radio Frequency Quadrupole (RFQ) and a 20 MeV Drift Tube Linac (DTL). In such high intensity accelerators, beam halos are of concern as they not only cause an increase in emittance, but also lead to beam loss and radio activation. We have studied the effect of beam mismatch at the DTL input on halo formation and propagation. The particle core model is used to excite the three envelope eigen modes; the quadrupole mode, the fast mode and the slow mode by giving input beam mismatch. These modes get damped as the beam progresses through the DTL. The damping mechanism is clearly Landau damping and leads to increase in rms emittance of the beam. The evolution of these modes and the corresponding increase in beam emittance and maximum beam extent, as the beam propagates through the DTL, has been studied for different space charge tunes. The halo parameter based on the definition of Allen and Wangler has been calculated. It is seen that beam halos are very important for LEHIPA DTL, even at 20 MeV and leads to emittance and beam size increase and also to beam loss in some cases. The longitudinal halo is present even without mismatch and transverse halos arise in the presence of beam mismatch.

  3. Development of UO2/PuO2 dispersed in uranium matrix CERMET fuel system for fast reactors

    International Nuclear Information System (INIS)

    CERMET fuel with either PuO2 or enriched UO2 dispersed in uranium metal matrix has a strong potential of becoming a fuel for the liquid metal cooled fast breeder reactors (LMR’s). In fact it may act as a bridge between the advantages and disadvantages associated with the two extremes of fuel systems (i.e. ceramic fuel and metallic fuel) for fast reactors. At Bhabha Atomic Research Centre (BARC), R and D efforts are on to develop this CERMET fuel by powder metallurgy route. This paper describes the development of flow sheet for preparation of UO2 dispersed in uranium metal matrix pellets for three different compositions i.e. U–20 wt%UO2, U–25 wt%UO2 and U–30 wt%UO2. It was found that the sintered pellets were having excellent integrity and their linear mass was higher than that of carbide fuel pellets used in Fast Breeder Test Reactor programme (FBTR) in India. The pellets were characterized by X-ray diffraction (XRD) technique for phase analysis and lattice parameter determination. The optical microstructures were developed and reported for all the three different U–UO2 compositions.

  4. Seismic re-evaluation of piping systems of heavy water plant, Kota

    CERN Document Server

    Mishra, R; Soni, R S; Venkat-Raj, V

    2002-01-01

    Heavy Water Plant, Kota is the first indigenous heavy water plant built in India. The plant started operation in the year 1985 and it is approaching the completion of its originally stipulated design life. In view of the excellent record of plant operation for the past so many years, it has been planned to carry out various exercises for the life extension of the plant. In the first stage, evaluation of operation stresses was carried out for the process critical piping layouts and equipment, which are connected with 25 process critical nozzle locations, identified based on past history of the plant performance. Fatigue life evaluation has been carried out to fmd out the Cumulative Usage Factor, which helps in arriving at a decision regarding the life extension of the plant. The results of these exercises have been already reported separately vide BARC/200I /E/O04. In the second stage, seismic reevaluation of the plant has been carried out to assess its ability to maintain its integ:rity in case of a seismic e...

  5. Radiation imaging for basic and applied research

    International Nuclear Information System (INIS)

    To peer into the interiors of a microscopic and macroscopic objects has been the dream of scientist and engineers for centuries. New frontiers in research and development in many branches of science and engineering such as biology, chemistry, engineering, geology, medical or physics have evolved around visual representation of the measurable property of an object, or phenomenon. Visualization using optical radiations provide limited information and often to look into the interiors of microscopic and macroscopic objects, probing with radiations such as x-ray or neutron is required. Such radiations are not directly visible and in order to unravel the data and images unfolded by such radiations, use of luminescent materials which convert these radiations into visible spectrum is required. Radiation imaging techniques have evolved in last few years and with this, new applications in the field of basic and applied sciences have developed. This has put greater demand on the development of new phosphors and scintillators suited for specific applications. This paper reviews new developments in radiation imaging techniques and applications and highlight the use of various phosphors and scintillators for such applications. As the subject is vast, only a few selected topics will be discussed on which work is being carried out at BARC. (author)

  6. Application of Handheld Tele-ECG for Health Care Delivery in Rural India

    Directory of Open Access Journals (Sweden)

    Meenu Singh

    2014-01-01

    Full Text Available Telemonitoring is a medical practice that involves remotely monitoring patients who are not at the same location as the health care provider. The purpose of our study was to use handheld tele-electrocardiogram (ECG developed by Bhabha Atomic Research Center (BARC to identify heart conditions in the rural underserved population where the doctor-patient ratio is low and access to health care is difficult. The objective of our study was clinical validation of handheld tele-ECG as a screening tool for evaluation of cardiac diseases in the rural population. ECG was obtained in 450 individuals (mean age 31.49 ± 20.058 residing in the periphery of Chandigarh, India, from April 2011 to March 2013, using the handheld tele-ECG machine. The data were then transmitted to physicians in Postgraduate Institute of Medical Education and Research (PGIMER, Chandigarh, for their expert opinion. ECG was interpreted as normal in 70% individuals. Left ventricular hypertrophy (9.3% was the commonest abnormality followed closely by old myocardial infarction (5.3%. Patient satisfaction was reported to be ~95%. Thus, it can be safely concluded that tele-ECG is a portable, cost-effective, and convenient tool for diagnosis and monitoring of heart diseases and thus improves quality and accessibility, especially in rural areas.

  7. Application of radiation and radioisotopes for the management of insect pests of economic importance

    International Nuclear Information System (INIS)

    This article gives brief account of radiation and radioisotope applications in the field of insect pest management. Radiation has a direct application in controlling insect pests, through sterile insect techniques (SIT) and radiation disinfestations of food grains, whereas radioisotopes can be used in basic as well as applied studies in the field of insect physiology, ecology and metabolism. The successful implementation of SIT against New world screwworm fly and different fruit fly species has clearly demonstrated the usefulness of radiation in agriculture. Over the past 35 years, the joint FAO/IAEA committee has played a critical role in supporting member states in the development and application of SIT for the management of various economically important insect pests. BARC has developed SIT for the management of red palm weevil, Rhynchophorus ferrugineus Oliv, the most serious pest of coconut in India and date palms in Arabian countries. Now, through thematic BRNS project this technique is being evaluated under field conditions in collaboration with three Indian agricultural universities. Present status and future prospects of sterile insect technique for the area wide control of different insect species will be discussed in detail. (author)

  8. Diffusion coefficient of the decay products of krypton and xenon

    International Nuclear Information System (INIS)

    Measurement of diffusion coefficient of the decay products of krypton and xenon e.g. sup(88,89)Rb and 138Cs is useful for evaluating the inhalation dose and also for the measurement of the concentration of noble gases by double filter method. A diffusion sampler developed by Kotrappa et al., based on Mercer's theory of diffusional deposition between the concentric circular plates was used. The deposition of decay products of krypton and xenon on the circular plates was measured using a multichannel analyser available in this division of BARC (HPGe 4K MCA). Experiments were conducted at 15 and 140 air changes per hour and at different humidities (50-100%). The diffusion coefficient for 88Rb, 89Rb, 138Cs were found to be 0.050±0.008, 0.047±0.008 and 0.047±0.006 respectively at 15 air changes per hour. The diffusion coefficients for these radionuclides were observed to be 0.061±0.005, 0.059±0.006 and 0.058±0.005 at high ventilation rate (140 air changes per hour). This study demonstrates that the diffusion coefficients increase with increasing ventilation rates. The effect of relative humidity on diffusion coefficient is less pronounced at high ventilation rate. (author). 8 refs., 1 fig., 2 tabs

  9. Nuclear Physics Division Biennial Report 1995-1996

    International Nuclear Information System (INIS)

    The report gives an overview of the scientific and technical activities of the Nuclear Physics Division (NPD) during the last two years. The physics report includes detailed experimental explorations carried out using heavy ion beams at the BARC-TIFR Pelletron facility located at Tata Institute of Fundamental Research (TIFR) and operated by NPD staff. The report also includes the experimental collaborations carried out at advanced accelerator facilities, like RHIC, COSY, etc., abroad for the quark gluon plasma studies and the η meson production in the intermediate energy nuclear reactions. The theoretical research reported includes that relevant to various experimental programs mentioned above and in general, the nuclear physics in non- and sub-nucleonic domains. In the field of accelerator development the division has the ongoing projects of the design, development, fabrication and installation of the 7 MV Folded Tandem Ion Accelerator (FOTIA) and Superconducting Linac Booster for the Pelletron Accelerator. The first stage of the linac project has been completed. It has successfully demonstrated the functioning of the indigenously developed resonator modules. On FOTIA project the installation has begun. The injector part for putting the beam in the vertical column is working. The Pelletron Accelerator, the main work horse for experimentalists, provided an excellent service to the users. A report on its running and maintenance is included. (author)

  10. Nuclear Desalination Demonstration Project (NDDP) in India

    International Nuclear Information System (INIS)

    In order to gainfully employ the years of experience and expertise in various aspects of desalination activity, BARC (India) has undertaken installation of a hybrid nuclear desalination plant coupled to 170 MW(e) PHWR station at Kalpakkam, Chennai in the Southeast coast of India. The integrated system, called the Nuclear Desalination Demonstration Project (NDDP), will thus meet the dual needs of process water for nuclear power plant and drinking water for the neighbouring people. NDDP aims for demonstrating the safe and economic production of good quality water by nuclear desalination of seawater. It comprises a 4500 m3 /d Multistage Flash (MSF) and a 1800 m3/d Reverse Osmosis (RO) plant. MSF section uses low pressure steam from Madras Atomic Power Station (MAPS), Kalpakkam. The objectives of the NDDP (Kalpakkam) are as follows: to establish the indigenous capability for the design, manufacture, installation and operation of nuclear desalination plants; to generate necessary design inputs and optimum process parameters for large scale nuclear desalination plant; to serve as a demonstration project to IAEA welcoming participation from interested member states. The hybrid plant is envisaged to have a number of advantages: a part of high purity desalted water produced from MSF plant will be used for the makeup demineralised water requirement (after necessary polishing) for the power station; blending of the product water from RO and MSF plants would provide requisite quality drinking water; the RO plant will continue to be operated to provide the water for drinking purposes during the shutdown of the power station

  11. Identification of Conserved Regulatory Elements in Mammalian Promoter Regions: A Case Study Using the PCK1 Promoter

    Institute of Scientific and Technical Information of China (English)

    George E. Liu; Matthew T. Weirauch; Curtis P. Van Tassell; Robert W. Li; Tad S. Sonstegard; Lakshmi K. Matukumalli; Erin E. Connor; Richard W. Hanson; Jianqi Yang

    2008-01-01

    A systematic phylogenetic footprinting approach was performed to identify conserved transcription factor binding sites (TFBSs) in mammalian promoter regions using human, mouse and rat sequence alignments. We found that the score distributions of most binding site models did not follow the Gaussian distribution required by many statistical methods. Therefore, we performed an empirical test to establish the optimal threshold for each model. We gauged our computational predictions by comparing with previously known TFBSs in the PCK1 gene promoter of the cytosolic isoform of phosphoenolpyruvate carboxykinase, and achieved a sensitivity of 75% and a specificity of approximately 32%. Almost all known sites overlapped with predicted sites, and several new putative TFBSs were also identified. We validated a predicted SP1 binding site in the control of PCK1 transcription using gel shift and reporter assays. Finally, we applied our computational approach to the prediction of putative TFBSs within the promoter regions of all available RefSeq genes. Our full set of TFBS predictions is freely available at http://bfgl.anri.barc.usda.gov/tfbsConsSites.

  12. The pneumatic carrier facility in Dhruva reactor: commissioning, characterization and utilization

    International Nuclear Information System (INIS)

    The 100 MWt power Dhruva research reactor, BARC is provided with pneumatic carrier facility (PCF) to carry out R and D work using short-lived (seconds to minutes) radioisotopes in the fields like neutron activation analysis (NAA) and nuclear fission. The samples are kept inside a high density polypropylene capsule (rabbit), which is pneumatically sent to the irradiation position in the core and retrieved after a preset time of irradiation. After the irradiation, radioactivity assay is carried out using high resolution gamma ray spectrometry with HPGe detector coupled to PC based MCA. The availability of high neutron flux (∼ 5 x 10 13 cm-2s-1 at 50 MWt power) and shorter retrieval time (∼5 seconds) make it possible to measure short-lived isotopes with enhanced sensitivity. This report describes the salient features of this facility, characterization of the neutron spectrum at this irradiation position and its utilization. The PCF is being extensively utilized for analytical applications using NAA as well as nuclear fission studies. A brief description of analysis of some samples of geological, environmental and biological origin, nuclear materials as well as reference materials is included in this report. Protocol and check list for carrying out PCF irradiations and gamma spectrometric assay are also given at the end of the report. (author)

  13. Challenges in development of matrices for vitrification of old legacy waste and high-level radioactive waste generated from reprocessing of AHWR and FBR spent fuel

    International Nuclear Information System (INIS)

    Majority of radioactivity in entire nuclear fuel cycle is concentrated in HLW. A three step strategy for management of HLW has been adopted in India. This involves immobilization of waste oxides in stable and inert solid matrices, interim retrievable storage of the conditioned waste product under continuous cooling and disposal in deep geological formations. Glass has been accepted as most suitable matrix world-wide for immobilization of HLW, because of its attractive features like ability to accommodate wide range of waste constituents, modest processing temperatures, adequate chemical, thermal and radiation stability. Borosilicate glass matrix developed by BARC in collaboration with CGCRI has been adopted in India for immobilization of HLW. In view of compositional variation of HLW from site to site, tailor make changes in the glass formulations are often necessary to incorporate all the waste constituents and having the product of desirable characteristics. The vitrified waste products made with different glass formulations and simulated waste need to be characterized for chemical durability, thermal stability, homogeneity etc. before finalizing a suitable glass formulation. The present extended abstract summarises the studies carried out for development of glass formulations for vitrification of legacy waste and futuristic waste likely to be generated from AHWR and FBR having wide variations in their compositions. The presently stored HLW at Trombay is characterized by significant concentrations of uranium, sodium and sulphate in addition to fission products, corrosion products and small amount of other actinides

  14. Study of Radioactive Impurities in Neutron Transmutation Doped Germanium

    CERN Document Server

    Mathimalar, S; Singh, V; Nanal, V; Pillay, R G; Shrivastava, A; Jagadeesan, K C; Thakare, S V

    2014-01-01

    A program to develop low temperature (mK) sensors with neutron transmutation doped Ge for rare event studies with a cryogenic bolometer has been initiated. For this purpose, semiconductor grade Ge wafers are irradiated with thermal neutron flux from Dhruva reactor at BARC, Mumbai. Spectroscopic studies of irradiated samples have revealed that the environment of the capsule used for irradiating the sample leads to significant levels of $^{65}$Zn, $^{110}$Ag and $^{182}$Ta impurities, which can be reduced by chemical etching of approximately $\\sim50 \\mu$m thick surface layer. From measurements of the etched samples in the low background counting setup, activity due to trace impurities of $^{123}$Sb in bulk Ge is estimated to be $\\sim$ 1 Bq/gm after irradiation. These estimates indicate that in order to use the NTD Ge sensors for rare event studies, a cool down period of $\\sim$ 2 years would be necessary to reduce the radioactive background to $\\le$ 1 mBq/gm.

  15. Study of radioactive impurities in neutron transmutation doped germanium

    Energy Technology Data Exchange (ETDEWEB)

    Mathimalar, S.; Dokania, N.; Singh, V. [India-based Neutrino Observatory, Tata Institute of Fundamental Research, Mumbai 400 005 (India); Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094 (India); Nanal, V., E-mail: nanal@tifr.res.in [Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai 400 005 (India); Pillay, R.G. [Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai 400 005 (India); Shrivastava, A. [Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085 (India); Jagadeesan, K.C.; Thakare, S.V. [Isotope Production and Applications Division, Bhabha Atomic Research Centre, Mumbai 400 085 (India)

    2015-02-21

    A program to develop low temperature (mK) sensors with neutron transmutation doped Ge for rare event studies with a cryogenic bolometer has been initiated. For this purpose, semiconductor grade Ge wafers are irradiated with thermal neutron flux from Dhruva reactor at Bhabha Atomic Research Centre (BARC), Mumbai. Spectroscopic studies of irradiated samples have revealed that the environment of the capsule used for irradiating the sample leads to significant levels of {sup 65}Zn, {sup 110m}Ag and {sup 182}Ta impurities, which can be reduced by chemical etching of approximately ∼50μm thick surface layer. From measurements of the etched samples in the low background counting setup, activity due to trace impurities of {sup 123}Sb in bulk Ge is estimated to be ∼1Bq/g after irradiation. These estimates indicate that in order to use the NTD Ge sensors for rare event studies, a cooldown period of ∼2 years would be necessary to reduce the radioactive background to ≤1mBq/g.

  16. Role of nonlinear dynamics and chaos in applied sciences

    International Nuclear Information System (INIS)

    Nonlinear dynamics manifests itself in a number of phenomena in both laboratory and day to day dealings. However, little attention was being paid to this dynamically rich field. With the advent of high speed computers with visual graphics, the field has proliferated over past few years. One of the most rewarding realization from nonlinear dynamics is the universally acclaimed field of chaos. Chaos has brought in order and has broken the disciplinary boundaries that existed until recently. With its universal phenomena, almost all disciplines following an evolutionary character can be treated on same footing. Chaotic dynamics has its grounding in the multidisciplinary field of synergetics founded by Professor Hermann Haken. In this report, we address some of the basics related to the field of chaos. We have discussed simple mechanisms for generating chaotic trajectories, ways and means of characterizing such systems and the manifestation of their signatures in the evolutions. We have mentioned the links of this field with other existing theories. We have outlined the topics on bifurcation and stability of dynamical systems. Information theoretic aspects and notions on fractal geometry are reviewed in the light of dynamical characterization of chaotic systems. Application oriented views of this novel dynamical phenomena are discussed through examples on simple nonlinear electronic circuits and a BWR reactor. Some ideas relating to control and synchronization in chaotic systems also addressed. In conclusion, we have explored the possibilities of exploiting nonlinear dynamics and chaos in the context of multidisciplinary character of BARC. (author)

  17. Variable energy microtron at Mangalore University

    International Nuclear Information System (INIS)

    Among the electron accelerators, microtron is a simple, less cost accelerator with an excellent beam quality, small energy spread of electron beam, low emittance, relatively less power loss associated with the microtrons and easy maintenance machine. A 4-12 MeV variable energy microtron designed and fabricated at Centre for Advanced Technology (CAT), Indore has recently been installed and commissioned at Mangalore University in collaboration with CAT, Indore and Bhabha Atomic Research Centre (BARC), Mumbai. The important features of the microtron such as beam energy, pulse current, number of orbits, beam size, pulse duration, average beam power and dose rate are presented in this paper. Machine details like electromagnet weight, magnetic field strength, magnetron power, operation frequency and voltage of rf cavity are also presented. It is proposed to undertake R and D programmes on radiation dosimetry, Bremsstrahlung and other basic interaction processes, radiation damage, radiation processing, irradiation effect on polymers, industrial radiation processing and geochemical analyses of mineral and other samples. (author). 2 figs

  18. Evaluation and Numerical Simulation of Tsunami for Coastal Nuclear Power Plants of India

    International Nuclear Information System (INIS)

    Recent tsunami generated on December 26, 2004 due to Sumatra earthquake of magnitude 9.3 resulted in inundation at the various coastal sites of India. The site selection and design of Indian nuclear power plants demand the evaluation of run up and the structural barriers for the coastal plants: Besides it is also desirable to evaluate the early warning system for tsunami-genic earthquakes. The tsunamis originate from submarine faults, underwater volcanic activities, sub-aerial landslides impinging on the sea and submarine landslides. In case of a submarine earthquake-induced tsunami the wave is generated in the fluid domain due to displacement of the seabed. There are three phases of tsunami: generation, propagation, and run-up. Reactor Safety Division (RSD) of Bhabha Atomic Research Centre (BARC), Trombay has initiated computational simulation for all the three phases of tsunami source generation, its propagation and finally run up evaluation for the protection of public life, property and various industrial infrastructures located on the coastal regions of India. These studies could be effectively utilized for design and implementation of early warning system for coastal region of the country apart from catering to the needs of Indian nuclear installations. This paper presents some results of tsunami waves based on different analytical/numerical approaches with shallow water wave theory. (authors)

  19. Numerical Study of Passive Catalytic Recombiner for Hydrogen Mitigation

    Directory of Open Access Journals (Sweden)

    Pavan K Sharma

    2010-10-01

    Full Text Available A significant amount of hydrogen is expected to be released within the containment of a water cooled power reactor after a severe accident. To reduce the risk of deflagration/detonation various means for hydrogen control have been adopted all over the world. Passive catalytic recombiner with vertical flat catalytic plate is one of such hydrogen mitigating device. Passive catalytic recombiners are designed for the removal of hydrogen generated in order to limit the impact of possible hydrogen combustion. Inside a passive catalytic recombiner, numerous thin steel sheets coated with catalyst material are vertically arranged at the bottom opening of a sheet metal housing forming parallel flow channels for the surrounding gas atmosphere. Already below conventional flammability limits, hydrogen and oxygen react exothermally on the catalytic surfaces forming harmless steam. Detailed numerical simulations and experiments are required for an in-depth knowledge of such plate type catalytic recombiners. Specific finite volume based in-house CFD code has been developed to model and analyse the working of these recombiner. The code has been used to simulate the recombiner device used in the Gx-test series of Battelle-Model Containment (B-MC experiments. The present paper briefly describes the working principle of such passive catalytic recombiner and salient feature of the CFD model developed at Bhabha Atomic Research Centre (BARC. Finally results of the calculations and comparison with existing data are discussed.

  20. Studies on mutagenic effectiveness and efficiency of gamma rays and its effect on quantitative traits in finger millet (Eleusine coracana L. Gaertn

    Directory of Open Access Journals (Sweden)

    A.R. Ambavane

    2015-01-01

    Full Text Available Dry seeds (12% moisture of two finger millet cultivar viz., Dapoli-1 and Dapoli Safed were irradiated with four doses of gamma-rays viz., 400 Gy, 500 Gy, 600 Gy and 700 Gy at BARC, Mumbai. In laboratory test, root and shoot lengths of seedlings were decreased with increase in dose of gamma rays. Similarly, germination percentage and survival rate of seedlings were decreased with increase in dose of gamma irradiation during field study. In M1 generation, three types of chlorophyll mutations viz., albino, xantha and viridis were observed. Albino and xantha were observed in all treatments, whereas, viridis observed only in lower doses viz., 400 Gy and 500 Gy. Based on the chlorophyll mutation frequency on M1 plants, mutagenic effectiveness and efficiency were computed. In Dapoli-1 variety, two early maturing mutants and three high yielding mutants were isolated from 500 Gy dose and 600 Gy dose, respectively. In M2 generation, the mutagenic treatments were effective in inducing various types of chlorophyll and morphological macro mutants, few of those show significant change in flowering, maturity and plant height character and few of them have good breeding value.

  1. CFD analysis of molten fluoride salt natural circulation in a rectangular loop

    International Nuclear Information System (INIS)

    Indian Molten Salt Breeder Reactor (IMSBR) is being designed and developed in BARC with main objective of utilizing thorium abundance in India. In order to design the reactor, it is necessary to study the thermal hydraulic behavior of various molten salts. Moreover, considering the importance of natural circulation in high temperature systems, experimental studies on natural circulation of molten salts are required. This paper deals with the fabrication of loop with molten salt, LiF+ThF4 (22.5-77.5 wt%), which is proposed as blanket salt for Indian MSBR program. Loop is fabricated with 15NB Sch 40 pipe made of Hastelloy-N material having height of 400 mm and width of 300 mm. CFD analysis for natural circulation of the same loop is also carried out. CFD simulation is performed for steady state and transient cases at different heater powers. Various transients such as: step power change, heater trip and start-up of natural circulation etc. are also carried out. Comparison of CFD results with standard correlation for steady state flow has been done. (author)

  2. Intense giga watt pulsed electron accelerators for HPM and FXR generation

    International Nuclear Information System (INIS)

    New development in the field of high power pulsed accelerator is the KALI-30GW system capable of delivering 1 MV, 30 kA, 80 ns electron beam pulses. This system has all indigenous components including energy storage capacitors and transformer oil as the dielectric and insulating medium. The energy balance in each stage of sub-system has been maintained to have better efficiency of energy transfer and improving the life of associated insulators. It has been used for high power microwaves generation using reflex triode and relativistic magnetron successfully. A suitable flash-X-rays gun is also designed and developed for this system. The results of these experiments will be presented in this paper. In order to make pulsed electron accelerators compact and repetitive, two more systems are developed in Accelerator and Pulse Power Division, BTDG, BARC which are Linear Induction Accelerator (LIA-400) tested up to 400 kV, 4 kA,100 ns,1-300 Hz and repetitive Marx generator rated for 300 kV, 12 kA, 300 ns, 10 Hz are also developed which are being used for Intentional ElectroMagnetic Interference (IEMI) studies of various electronics circuitry/devices. A few experimental investigations are also done using these systems to understand the effect of cathode material, relativistic electron beam and flash-X-rays emission. Latest results are being illustrated. (author)

  3. 小麦河农6251苗期抗叶锈病基因的鉴定%Identification of Wheat Leaf Rust Resistance Gene in Henong 6251 at Seedling Stage

    Institute of Scientific and Technical Information of China (English)

    任晓娣; 杜冬冬; 张河山; 姚宏鹏; 赵赛; 杨文香; 刘大群

    2015-01-01

    Preliminary research showed that they all contributed higher disease resistance level to Puccinia triti-cina.Detecting and mapping wheat leaf rust resistance gene were significance for application of the resistance in the wheat production .Resistant parents Henong 6251 ,susceptible parent Thatcher and their F 2 ,F3 populations were em-ployed to map the wheat leaf rust resistance genes in Henong 6251 based on SSR technique .Molecular marker-assis-ted identification results showed that Henong 6251 contained wheat leaf rust resistance genes Lr26 and LrZH84,and probably contained Lr2c and Lr17a.Henong 6251,Thatcher,and their Fl,F2 populations and F3 families were tested for detecting the wheat leaf rust resistance with single strain of Chinese P.triticina pathotype PBGP in greenhouse . The results showed that the wheat leaf rust resistance in Henong 6251 to PBGP was controlled by one dominant re-sistance gene,temporarily designated as LrH6.SSR molecular markers and BSA were used to test Henong 6251 and their resistant and susceptible bulks of F 2 and F3 populations for mapping the leaf rust resistance gene .Results indi-cated that Henong 6251 carried a single dominant resistance gene LrH6 to PBGP,and was preliminary located on chromosome 1B.The resistance gene LrH6 was linked to the three known SSR loci (wmc419,wms582 and barc120) on the 1 BL with genetic distance ranging 21 .6 ,25 .8 ,27 .9 cM respectively .Henong 6251 contained more than one leaf rust resistance genes including Lr26 and LrZH84 and the wheat leaf rust resistance to PBGP was controlled by one dominant and new resistance gene .%为明确河农6251含有的抗叶锈基因并对其进行分子定位,以抗病品种河农6251与感病品种Thatcher的杂种F1、F2、F3群体为材料,对河农6251的苗期抗叶锈基因进行定位。分子标记辅助鉴定结果表明,河农6251中含有抗叶锈基因Lr26和LrZH84,可能含有Lr2c和Lr17a;遗传分析表明,河农6251

  4. A Big Data Driven Adaptive Routing Service Customization Scheme%大数据驱动的自适应路由服务定制机制

    Institute of Scientific and Technical Information of China (English)

    卜超; 王兴伟; 李福亮; 黄敏

    2016-01-01

    service Customization scheme (BARC)is proposed.Driven by the big data about the status of in-network flows,a user requirement attribute model is created,the dependencies between user experience and routing requirements are exploited,and then the candidate routing function set is obtained.Considering the benefit-based relationships between users and Internet Service Providers (ISPs)under the commercialized network operation,the win-win gaming strategies are proposed to obtain the routing service customization schemes with mutual interests optimized.Simulation results and performance evaluation show that the proposed BARC is feasible and effective.

  5. PREFACE: 23rd National Symposium on Plasma Science & Technology (PLASMA-2008)

    Science.gov (United States)

    Mago, V. K.; Ananthapadmanabhan, P. V.; Patil, D. S.; Das, A. K.

    2010-01-01

    plasma technology to a large number of industrial sectors. The number of users of plasma machines is steadily increasing in the country. In recent years, the use of plasma has become common practice to develop novel materials, to increase specific yields and to improve the all-round product quality. The main emphasis of this symposium has been to focus on issues related to new directions in Basic Plasmas as well as Plasma Technology. The response to this symposium has been overwhelming. The present volume is a compilation of the papers from plenary lectures, invited talks and contributory papers presented by the participants. The invited presentations and contributed papers cover a wide spectrum of issues including novel plasma based devices and their applications. The industry response to this symposium has also been highly encouraging. It is heartening to note the enthusiastic response from the student community. We are thankful to the leading national and international experts who readily agreed to participate in the symposium and provided the abstracts of their talks well in advance. Our sincere thanks are due to all invited and plenary speakers. The editors and editorial working group express their heartfelt thanks to Dr Anil Kakodkar, Chairman, Atomic Energy Commission and Secretary, Government of India, for his constant encouragement. Our grateful thanks are due to Dr S Banerjee, Director, BARC, for his keen interest, encouraging message and support for the symposium. Thanks are also due to Board of Research in Nuclear Sciences (BRNS), Department of Science and Technology, Board of Research in Fusion Science and Technology and other agencies for sponsoring this symposium. The editors are extremely grateful to the National Advisory Committee and its Chairman, Professor P K Kaw, Dr L M Gantayet, Director, BTDG, BARC, and Chairman, Scientific Advisory Committee, Dr A K Das, Chairman, Symposium Organizing Committee and the Plasma Science Society along with all the

  6. A new PC based semi-automatic TLD badge reader system for personnel monitoring

    Energy Technology Data Exchange (ETDEWEB)

    Kulkarni, M.S.; Pradeep, Ratna; Kannan, S. [Radiation Protection and Instrumentation Section, Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai (India)

    2000-05-01

    A semi-automatic TDL (thermo-luminescence dosimeter) badge reader system has been developed for large-scale personnel monitoring of the radiation workers. The BARC (Bhabha Atomic Research Centre) TLD badge consists of three dosimeters of CaSO{sub 4}: Dy embedded in Teflon, each of 0.8mm/0.4mm thickness and 13mm diameter. 50 such TLD badges loaded in a magazine are automatically processed one by one using a motor driven mechanical assembly. Except for the entry of identification numbers in the same sequence in which the badges are loaded in the magazine, the entire process is automatic. All the front-end functions in the reader assembly are controlled by an Atmel 89C51 microcontroller on command from a Personal Computer through an RS-232 serial interface. A hot gas (N{sub 2}) heating system with electronic temperature control is used for rapid and uniform heating of the dosimeters. The glow curve and temperature profile of TL dosimeter is displayed on-line on a PC monitor and stored in the memory along with the badge data at the end of each reading cycle. The other features of the reader system are reproducible time temperature profile of hot gas, software based dark current sampling and subtraction, auto ranging, built-in safeguards in both hardware and software against mechanical and electronic failures, etc. To enable a wide range of measurement with high sensitivity to lower levels of TL, the EHT is automatically switched to a lower value when high TL output is encountered. The software is developed in to two parts. The first one consists of a ROM based assembly language software for the 89C51 microcontroller, which monitors various, circuits in the reader assembly and controls the motorized movements. The second part is a password protected user friendly, menu driven software package written in 'C' language for the reader control, on-line glow curve display and storage, dose data management record keeping and printout of dose reports, etc. Elaborate

  7. Indian Vacuum Society: The Indian Vacuum Society

    Science.gov (United States)

    Saha, T. K.

    2008-03-01

    The Indian Vacuum Society (IVS) was established in 1970. It has over 800 members including many from Industry and R & D Institutions spread throughout India. The society has an active chapter at Kolkata. The society was formed with the main aim to promote, encourage and develop the growth of Vacuum Science, Techniques and Applications in India. In order to achieve this aim it has conducted a number of short term courses at graduate and technician levels on vacuum science and technology on topics ranging from low vacuum to ultrahigh vacuum So far it has conducted 39 such courses at different parts of the country and imparted training to more than 1200 persons in the field. Some of these courses were in-plant training courses conducted on the premises of the establishment and designed to take care of the special needs of the establishment. IVS also regularly conducts national and international seminars and symposia on vacuum science and technology with special emphasis on some theme related to applications of vacuum. A large number of delegates from all over India take part in the deliberations of such seminars and symposia and present their work. IVS also arranges technical visits to different industries and research institutes. The society also helped in the UNESCO sponsored post-graduate level courses in vacuum science, technology and applications conducted by Mumbai University. The society has also designed a certificate and diploma course for graduate level students studying vacuum science and technology and has submitted a syllabus to the academic council of the University of Mumbai for their approval, we hope that some colleges affiliated to the university will start this course from the coming academic year. IVS extended its support in standardizing many of the vacuum instruments and played a vital role in helping to set up a Regional Testing Centre along with BARC. As part of the development of vacuum education, the society arranges the participation of

  8. Healing wounds - radiation processing technology for hydrogel dressing

    International Nuclear Information System (INIS)

    Uses of hydrogels are known and have several applications in medical field. Drug delivery devices, contact lenses, wound dressing, artificial cartilage's or membranes, vascular prosthesis, gel coated catheters etc., are some of the examples. Due to direct relevance to human health, scientists have been continuously exploring these systems. Generally, hydro (water) gels contain 30-90% of water entrapped in a three dimensional network structure of a hydrophilic polymer. The large water content makes them highly bio-compatible and therefore preferred for use as biomaterials. Some of the hydrophilic polymers used in these applications include poly (vinyl pyrrolidone), poly (ethylene oxide), poly (vinyl alcohol) and poly (acrylic acid ). Depending upon the nature of application, the size of these hydrogel can vary from nanometers (nanogels, injectable hydrogels) to centimeters to meters (wound dressing, fire blankets, drug delivery devices and implants). BARC hydrogel dressings have been so far used for treating burns, leprosy ulcers, animal bites, diabetic foot ulcers, herpes, fresh scars, bullet injuries, boils, pimples, sun burns, abrasion, surgical wounds of breast cancer, as bolus for radiation therapy in cancer etc. The use of gels have shown excellent result in diabetic ulcers which definitely provides an alternate to expensive biotech products and relief to expanding population of diabetics in India. Its application and some of the examples are shown in the paper. Other hydrogel based products which are under development in the authors laboratory are radiation processed silver nano-particle hydrogels to treat infected wounds and fire blankets for whole body coverage for protection from fire for defense personnel and fire service people

  9. Analyses of archaeological pottery samples using X-ray fluorescence technique for provenance study

    International Nuclear Information System (INIS)

    Archaeological artifacts reveal information on past human activities, artifact preparation technology, art and possible trade. Ceramics are the most stable and abundant material in archaeological context. Pottery is the most abundant tracers in all archaeological excavations. Compared to major elements, elements present at trace concentrations levels are source specific and they maintain same concentration levels in source clay as well as finished products e.g., fired clay potteries. As it is difficult to find out exact source or origin, provenance study is carried out first to establish whether objects under study are from the same or different sources/origin. Various analytical techniques like instrumental neutron activation analysis (INAA), Ion beam analysis (IBA) and X-ray fluorescence (XRF) have been used for obtaining elemental concentrations in archaeological potteries. Portable X-ray fluorescence (pXRF) spectrometry provides a non-destructive means for elemental characterization of a wide range of archaeological materials. Ten archaeological pottery samples were collected from Kottapuram, Kerala under the supervision of archaeological survey of India. Portable X-ray fluorescence (pXRF) spectrometry using a handheld Olympus Innov-X Delta XRF device, ACD BARC, has been used for chemical characterization of the pottery samples. The instrument is equipped with the Delta Rhodium (Rh) anode X-Ray tube and uses a Silicon Drift Detector (resolution <200 eV at 5.95 keV Mn Kα X-ray). NIST 2781 SRM was analyzed for quality control purpose. Ten elements namely Fe, Ti, Mn, Co, Cu, Zn, Pb, Zr, Mo and Se were chosen for cluster analysis and their concentration values were utilized for multivariate statistical analysis using WinSTAT 9.0

  10. A model for analyzing CANDU-6 SDS No.2 poison injection system

    International Nuclear Information System (INIS)

    In CANDU reactor one of the two reactor shutdown systems is the liquid poison injection system which injects the highly pressurized liquid neutron poison into the moderator tank via small holes on the nozzle pipes. To ensure the safe shutdown of a reactor it is necessary for the poison curtains generated by jets provide quick, and enough negative reactivity to the reactor during the early stage of the accident. In order to produce the neutron cross section necessary to perform this work, the poison concentration distribution during the transient is necessary. In this study, a set of models for analyzing the transient poison concentration induced by this high pressure poison injection jet activated upon the reactor trip in a CANDU-6 reactor moderator tank has been developed and used to generate the poison concentration distribution of the poison curtains induced by the high pressure jets injected into the vacant region between the pressure tube banks. The poison injection rate through the jet holes drilled on the nozzle pipes is obtained by a 1-D transient hydrodynamic code called. ALITRIG, and this injection rate is used to provide the inlet boundary condition to a 3-D CFD model of the moderator tank based on CFX4.3, a CFD code, to simulate the formation of the poison jet curtain inside the moderator tank. For the validation, an attempt was made to validate this model against a poison injection experiment performed at Bhabha Atomic Research Center (BARC) of India. The interim progress will be presented and the validation analysis result is discussed

  11. Engineered safety in development of liquid poison injection system (shut down system-2) for 500 MWe PHWR

    International Nuclear Information System (INIS)

    Full text: The provision of shut down systems (SDS) is a mandatory requirement for safety of any nuclear reactor. The SDS shall be capable of making and holding the core adequately subcritical in the event of any anticipated operational occurrence and postulated accident conditions. The shut down function will perform as intended when its design and components are thoroughly evaluated for their reliability and effectiveness. A full scale mock up for one injection unit was designed and developed at Hall No.7, BARC. Experimental studies were carried out to qualify the design and evolve process parameters such as gas tank pressure, poison discharge rate and poison injection time. In liquid poison injection system i.e. shutdown system -2, there is no physical barrier, between the two liquids i.e. the poison and the moderator. A liquid in liquid interface, called poison moderator interface (PMI) separates these fluids. Extensive lab scale studies have been carried out on PMI movement study i.e. the interface movement due to molecular diffusion and due to process disturbances under simulated reactor condition. On the basis of lab scale results, a full-scale PMI setup has been designed and developed to generate plant data. From reactor safety consideration, the floating ball in poison tank is designed in such a way that it prevents the over pressurisation of calandria. For this purpose a non-intrusive ultrasonic ball detection system (U-BDS) has been developed. This paper covers the PMI system for 500 MWe PHWR with relevant safety aspects and describes in detail, the experimental results of PMI study. The engineered safety in design, methodology and qualification of U-BDS and its role intended in performance of SDS-2 have been also discussed in the paper

  12. 小滨麦易位系山农0096抗条锈基因的微卫星标记和染色体定位%Microsatellite Marker and Chromosomal Location of the Yellow Rust Resistance Gene in Tritileymus Translocation Line Shannong0096

    Institute of Scientific and Technical Information of China (English)

    王金平; 王洪刚; 赵瑾; 刘海燕; 西廷业; 高居荣

    2008-01-01

    从普通小麦品种烟农15与八倍体小滨麦杂交后代中选育的小滨麦种质系山农0096,综合性状优良,高抗条锈病,经鉴定为导入了滨麦草染色体的小片段易位系.通过抗性接种鉴定和遗传分析,推测山农0096的条锈病抗性由显性单基因控制,抗条锈病基因来源于滨麦草,暂将其表示为YrSn0096.利用F2分离群体分组法(BSA)对山农0096中的抗条锈病基因进行了微卫星标记分析,从1 261对SSR引物中筛选出引物BARC236-4A能在滨麦草、八倍体小滨麦和山农0096中扩增出特异性DNA片段Xbarc236-4A255bp;利用该标记检测山农0096x辉县红F2群体的单株DNA,根据扩增带型,利用软件MAPMAKER3.0确定标记Xbarc236-4A与滨麦草抗条锈基因的遗传距离为5.0 cM,并将该抗条锈病基因定位在4A染色体上.

  13. Structural integrity aspects of reactor safety

    Indian Academy of Sciences (India)

    K K Vaze

    2013-10-01

    The overall goal of nuclear power plant safety is to protect individuals, society and the environment from undue radiological hazard so that nuclear power production does not significantly add to the health risks to which individuals and society are already exposed. This paper addresses the safety principles followed during the design phase of life cycle of a nuclear power plant. The principles followed such as safety classification, design rules based on failure modes, detailed stress analysis, stress categorization, consideration of design basis events, failure probability, flaw tolerance, leak-before-break are described. Engineering structures always contain flaws, albeit of very small size. Fatigue and fracture are the two important failure modes affected by flaws. Thus flaw tolerance becomes very important. This is assessed by applying fracture mechanics principles. The R6 procedure, which is used for evaluation of structures containing flaws, has been incorporated in the software BARC-R6. Improvements by way of shell-nozzle junction pull-out, adoption of hot wire GTAW with narrow gap technique have been brought out. Post Fukushima incidence, resistance to seismic loading and containment design have assumed great importance. The paper describes these aspects in detail. Regulatory aspects of seismic design regarding siting, Seismic margin assessment, base isolation, retrofitting are the aspects covered under seismic design. Under the action of seismic loading, the piping in a nuclear power plant piping is vulnerable to a phenomenon called ratcheting. The process of seismic margin assessment and consideration of ratchetting has been backed up by a large experimental data. The experiments carried out on structures and piping components form a part of the paper.

  14. Design of a molten heavy-metal coolant and target for fast-thermal accelerator driven sub-critical system (ADS)

    International Nuclear Information System (INIS)

    Reactor physics design of a 750 MWth one way coupled fast-thermal ADS was evolved in BARC earlier. This indicated that a fairly large thermal power output was possible with a proton beam of 1 GeV and current 2-3 mA. We also carried out preliminary studies on the molten Pb/Pb-Bi coolant and spallation-target system in the fast zone of this ADS. The thermal power in this zone was estimated to be about 109 MW. In these studies, analyses related to thermal hydraulics have been carried out for a buoyancy driven system to determine the coolant parameters for both lead as well as lead-bismuth eutectic. This design is similar to the passive lead coolant system design of CERN-EA. Appropriate equations for buoyancy pressure head, pressure drop in the reactor core; coolant velocity, heat transport etc. have been solved for different coolant inlet and outlet temperatures, fuel-pin pitch distances, fuel-power densities etc. The analyses show that coolant height required for generating buoyancy pressure head is a very strong function of power density of the fuel-pin and ΔT (difference between outlet and inlet temperature) of the coolant. Main advantage of lead-bismuth eutectic comes from the inlet temperature that can be significantly lower than that of lead; thus larger ΔT can be obtained which in turn will reduce required coolant height. This will result in saving of coolant inventory and cost. In this paper, preliminary engineering design of coolant and target for the 109 MW fast reactor zone is presented. In addition, the proposed Indian programmes to study thermal-hydraulics and materials for the technology development are discussed. (author)

  15. A remote controlled system for centralized online monitoring of radon in uranium mine and operating mine ventilation system on demand basis

    International Nuclear Information System (INIS)

    Radon and its decay products contribute a major fraction (∼50%) of the effective radiation dose to workers in uranium mines, the remaining part being mainly due to external gamma ray exposure. However, the dose due to radon and its decay products can be controlled by providing proper ventilation in workplaces. Hence, regular monitoring and control of radon form an essential component of the radiation protection programme in uranium mining and milling facilities. The current technique used for radon measurement in uranium mines is based on manual sampling using scintillation cells followed by alpha counting in the laboratory. In some cases, time integrated measurements using SSNTD based cup dosimeter system are also carried out. These practices have been serving the purpose of radiation dosimetry in uranium mines. However, there have been recent developments in radon monitoring instrumentation by RP and AD, BARC which can make important value addition to radiation dosimetry in these facilities. The present paper describes the development of a system for real time monitoring and control of radon and noxious gases in workplaces of uranium mining and milling facilities. Presently, this system has been installed at underground uranium mine, Turamdih, Jharkhand to study its performance for continuous operation in the mine environment. The system not only monitors and controls all the gaseous products within their permissible levels but also effectively utilizes the manpower in regulating their work location based on online data available at central console. Besides this, the system minimizes the routine practice such as sample collection, counting and data recording as a part of radiation monitoring protocol. Once the real time data is linked to the control system, it automates the switching of ventilation fan in the mine as per demand. This process not only helps cutting down the unnecessary wastage of electrical energy but also maintains a healthy working environment

  16. Validation of lattice code 'EXCEL' with TIC experiments on uniform and regularly perturbed lattices

    International Nuclear Information System (INIS)

    Temporary International Collective (TIC) was established in 1972 by an agreement among seven countries, namely, Bulgaria, Czechoslovakia, Germany, Hungary, Poland, Romania and Union of Soviet Socialist Republics. The main objective of TIC was to provide the experimental data for the reactor physics analysis of water cooled and water moderated power reactors (WWER). Extensive experimental work for different core configurations was carried out by TIC countries to investigate the physics behaviour of WWER lattices and the results were published in TIC volumes. Two VVER-1000 MWe reactors are currently in an advanced stage of construction and due for commissioning in Kudankulam, Tamil Nadu, India. Indigenous development of in-core fuel management computer codes for the analysis of hexagonal lattice cores is also in an advanced stage to address various design, operation and safety issues of VVER type cores. The validation of the above TIC lattice experiments will help in the identification of deficiencies in reactor physics design computational codes and the associated nuclear data libraries. In this paper, TIC experiments on uniform and regularly perturbed lattices have been analyzed as part of the validation of indigenous computer codes, EXCEL, TRIHEX-FA and HEXPIN developed at Light Water Reactors Physics Section, B.A.R.C. Neutron-nuclear multi-group cross-section libraries in WIMS/D format in 69/172 energy groups have been released by IAEA at the conclusion of WIMS library update project (WLUP). In the present study we have used libraries based on ENDF/B-6, ENDF/B-7, JEFF3.1 and JENDL3.2 evaluated nuclear datasets. The results of the theoretical analyses bring out the performance of the code system and various cross-section libraries.

  17. Life extension activities and modernization strategies for instrumentation ampersand control systems of research and power reactors in India

    International Nuclear Information System (INIS)

    Based on three and half decades of experience gained in the operation and maintenance of Instrumentation and Control Systems of nuclear reactors in India, specific investigations were made to understand various aspects of aging. The analysis of the failure rates of various instruments, plant outage figures and obsolescence of components have necessitated the replacement of instrumentation to improve the reliability and performance. The aging models available were used to determine the extent of performance degradation and to formulate maintenance strategies. The nuclear instrumentation of the aging research reactors at Bhabha Atomic Research Centre (BARC) has been replaced with high reliability equipment using modern integrated circuits. This has resulted in an improvement in the mean time between failure (MTBF) by a factor of five. The neutronic instrumentation of Fast Breeder Test Reactor (FBTR) at Madras is currently being upgraded with the introduction of microprocessor based safety units for reactivity computation and online testing of safety logic with Fine Impulse Technique. The operating experience has also indicated the necessity of developing online surveillance methods and status monitoring of various systems to detect aging. Online cable insulation measurement technique and noise analysis methods for vibration monitoring have been developed. Campbell method of signal processing has been successfully used in extending the useful life of Local Power Range monitors in the Boiling Water Reactor at Tarapur. In order to improve reliability, accuracy and provide efficient man machine interface, microprocessor based systems with online testing features have been installed in power reactors. These include the high performance reactor regulating system and centralised radiation monitoring systems commissioned at Kakrapara power station. The paper describes the above systems and the modernization strategies for nuclear instrumentation and control

  18. Early Years of Neutron Scattering and Its Manpower Development in Indonesia

    Science.gov (United States)

    Marsongkohadi

    2008-03-01

    In this paper I shall give a short history of the development of neutron scattering at the Research Centre for Nuclear Techniques (PPTN), in Bandung, and the early development of a more advanced facilities at the Neutron Scattering Laboratory (NSL BATAN), Centre of Technology for Nuclear Industrial Materials, in Serpong. The first research reactor in Indonesia was the TRIGA MARK II in Bandung, which became operational in 1965, with a power of 250 KW, upgraded to 1 MW in 1971, and to 2 MW in 2000. The neutron scattering activities was started in 1967, with the design and construction of the first powder diffractometer, and put in operation in 1970. It was followed by the second instrument, the filter detector spectrometer built in 1975 in collaboration with the Bhabha Atomic Research Centre (BARC), India. A powder diffractometer for magnetic studies was built in 1980, and finally, a modification of the filter detector spectrometer to measure textures was made in 1986. A brief description of the design and construction of the instruments, and a highlight of some research topics will be presented. Early developments of neutron scattering activities at the 30 MW, RSG-GAS reactor in Serpong in choosing suitable research program, which will be mainly centred around materials testing/characterization, and materials/condensed matter researches has been agreed. Instrument planning and layout which were appropriate to carry out the program had been decided. Manpower development for the neutron scattering laboratory is a severe problem. The efforts to overcome this problem has been solved. International Cooperation through workshops and on the job trainings also support the supply of qualified manpower.

  19. High purity materials as targets for radioisotope production: Needs and challenges

    Indian Academy of Sciences (India)

    V Shivarudrappa; K V Vimalnath

    2005-07-01

    Radionuclides have become powerful and indispensable tools in many endeavours of human activities, most importantly in medicine, industry, biology and agriculture, apart from R&D activities. Ready availability of radionuclides in suitable radiochemical form, its facile detection and elegant tracer concepts are responsible for their unprecedented use. Application of radioisotopes in medicine has given birth to a new branch, viz. nuclear medicine, wherein radioisotopes are used extensively in the diagnosis and treatment of variety of diseases including cancer. Artificial transmutation of an element employing thermal neutrons in a reactor or high energy particle accelerators (cyclotrons) are the routes of radioisotope production world over. Availability of high purity target materials, natural or enriched, are crucial for any successful radioisotope programme. Selection of stable nuclides in suitable chemical form as targets with desired isotopic and chemical purity are among the important considerations in radioisotope production. Mostly the oxide, carbonate or the metal itself are the preferred target forms for neutron activation in a research reactor. Chemical impurities, particularly from the elements of the same group, put a limitation on the purity of the final radioisotope product. Whereas the isotopic impurities result in the production of undesirable radionuclidic impurities, which affect their effective utilization. Isotope Group, BARC, is in the forefront of radioisotope production and supply in the country, meeting demands for gamut of radioisotope applications indigenously for over four decades now. Radioisotopes such as 131I, 99Mo, 32P, 51Cr, 153Sm, 82Br, 203Hg, 198Au etc are produced in TBq quantities every month and supplied to several users and to Board of Radiation and Isotope Technology (BRIT). Such a large production programme puts a huge demand on the reliable sources of availability of high purity target materials which are at present mostly met

  20. Application of k0-based internal monostandard NAA for large sample analysis of clay pottery. As a part of inter comparison exercise

    International Nuclear Information System (INIS)

    As a part of inter comparison exercise of an IAEA Coordinated Research Project on large sample neutron activation analysis, a large size and non standard geometry size pottery replica (obtained from Peru) was analyzed by k0-based internal monostandard neutron activation analysis (IM-NAA). Two large size sub samples (0.40 and 0.25 kg) were irradiated at graphite reflector position of AHWR Critical Facility in BARC, Trombay, Mumbai, India. Small samples (100-200 mg) were also analyzed by IM-NAA for comparison purpose. Radioactive assay was carried out using a 40 % relative efficiency HPGe detector. To examine homogeneity of the sample, counting was also carried out using X-Z rotary scanning unit. In situ relative detection efficiency was evaluated using gamma rays of the activation products in the irradiated sample in the energy range of 122-2,754 keV. Elemental concentration ratios with respect to Na of small size (100 mg mass) as well as large size (15 and 400 g) samples were used to check the homogeneity of the samples. Concentration ratios of 18 elements such as K, Sc, Cr, Mn, Fe, Co, Zn, As, Rb, Cs, La, Ce, Sm, Eu, Yb, Lu, Hf and Th with respect to Na (internal mono standard) were calculated using IM-NAA. Absolute concentrations were arrived at for both large and small samples using Na concentration, obtained from relative method of NAA. The percentage combined uncertainties at ±1 s confidence limit on the determined values were in the range of 3-9 %. Two IAEA reference materials SL-1 and SL-3 were analyzed by IM-NAA to evaluate accuracy of the method. (author)

  1. Inverse problems using ANN in long range atmospheric dispersion with signature analysis picked scattered numerical sensors from CFD

    International Nuclear Information System (INIS)

    Scalar dispersion in the atmosphere is an important area wherein different approaches are followed in development of good analytical model. The analyses based on Computational Fluid Dynamics (CFD) codes offer an opportunity of model development based on first principles of physics and hence such models have an edge over the existing models. Both forward and backward calculation methods are being developed for atmospheric dispersion around NPPs at BARC Forward modeling methods, which describe the atmospheric transport from sources to receptors, use forward-running transport and dispersion models or computational fluid dynamics models which are run many times, and the resulting dispersion field is compared to observations from multiple sensors. Backward or inverse modeling methods use only one model run in the reverse direction from the receptors to estimate the upwind sources. Inverse modeling methods include adjoint and tangent linear models, Kalman filters, and variational data assimilation, and neural network. The present paper is aimed at developing a new approach where the identified specific signatures at receptor points form the basis for source estimation or inversions. This approach is expected to reduce the large transient data sets to reduced and meaningful data sets. In fact this reduces the inherently transient data set into a time independent mean data set. Forward computation were carried out with CFD code for various case to generate a large set of data to train the ANN. Specific signature analysis was carried out to find the parameters of interest for ANN training like peak concentration, time to reach peak concentration and time to fall, the ANN was trained with data and source strength and location were predicted from ANN. Inverse problem was performed using ANN approach in long range atmospheric dispersion. An illustration of application of CFD code for atmospheric dispersion studies for a hypothetical case is also included in the paper. (author)

  2. Thorium based fuel for AHWR

    International Nuclear Information System (INIS)

    Advanced Heavy Water Reactor (AHWR) is a 300 MWe, thoria fuel based, vertical pressure tube type reactor designed at BARC. It is heavy water moderated and boiling light water cooled reactor that has been designed for hundred years of plant life. The reactor design has evolved from the presently operating PHWRs and BWRs in India. AHWR has extensive deployment of passive safety features for its operation and accident mitigation at par with the present international standards and provides a robust design against external as well as internal threats. The physics design ensures inherent safety characteristics of the reactor. Heat removal from the core under both normal full power operating condition as well as shutdown condition is by natural circulation of water coolant. The physical characteristics of Thoria based fuel offer potential for high performance in reactor and slower fuel deterioration. With inherent feature of fuel cycle flexibility, a variety of fuel-types could be used in AHWR for generating power efficiently. AHWR-Pu version makes use of (Th-Pu) MOX and (Th-233U) MOX fuel in the closed fuel cycle mode. The adoption of the closed thorium fuel cycle on an industrial scale is for the first time and is important in view of very little global experience. The experience generated on the various fuel cycle activities will be useful in utilisation of the large thoria reserves as envisaged in India's three-stage nuclear power programme. This paper provides an overview of the various design aspects of the thorium based fuel for AHWR and its associated developmental activities. (author)

  3. Balneotherapy in the Boghiş Resort

    Directory of Open Access Journals (Sweden)

    Gáspár Boróka

    2015-12-01

    Full Text Available The Băile Boghiş resort in Sălaj county is situated in the Barcău depression, at 15 km distance from Şimleu Silvaniei, in a sedative-indifferent climate of hills, at an altitude of 300 m, without excessive temperatures, with a mean annual rainfall of 650 mm. The first evidence of the climate and thermal mineral waters of the resort dates back to the 18th century. The Nuşfalău-Boghiş thermal mineral water reservoir is confined to deep permeable aquiferous layers that correspond to the altered zone of crystalline basement and sedimentary formations of Miocene and Pliocene age. It is an all-season spa and climatic resort; the bicarbonate, sodium, sulfur, iodine hypotonic hyperthermal mineral springs (with a total mineralization of 1016.2-1432.8 mg/l come from hydrogeological wells, producing over 1900 m3/day waters with a temperature of 40-42˚C. The spa has 2 outdoor pools (in summer time, bathtubs (in the process of being rehabilitated and an indoor pool. The peat mud from Stoboru (Cuzăplac commune is another therapeutic factor used in the resort. Therapeutic indications are related to the following disorders: osteoarticular system diseases, abarticular and degenerative rheumatic diseases, posttraumatic, peripheral neurological, gynecological, endocrine, nutrition and metabolic disorders, treated by external use (pool or bathtubs, while cooled water is used for crenotherapy. A specific feature is that thermal water, which has a temperature of 40-42˚C, can be used without being successively cooled or heated in pools or bathtubs, which allows to maintain its initial qualities. This paper includes early and recent data on a resort that is progressing from a local level to the national circuit, having an important extension potential.

  4. Electron beam processing of materials-R and D and industrial utilization

    International Nuclear Information System (INIS)

    The early sixties witnessed the beginning of Electron Beam (EB) processing of materials using high-energy electrons and has emerged as a well established technology, presently being adapted by the industry. The process and the processed materials showed definite and distinct advantages/characteristics over the available conventional methods. Even though the commercial exploitation started initially in polymer modifications for better (and suitable) performance through polymerization, cross-linking, degradation and grafting, the processing fields are now diverged to sterilization of health care, food irradiation, controlled defects in semiconductor devices and semi and/or precious stones, waste water/flue gas treatment etc. The availability of electron accelerators that operate as per the requirement of the industrial needs, easy maintenance, expertise availability etc brought the EB processing industry into a multi dollar business world wide. In USA and Japan there are more than 1200 accelerators currently operative in automobile tire, wire and cable and heat shrinkable industry. Output beam powers exceeding 400 kW with electron energy ranging from few hundred keV up to 10 MeV are made available to the industry. In BARC EB processing started with the 2MeV/20 kW electron accelerator and suitable processing techniques have been developed for applications like polymer cross linking (heat resistant LDPE O-rings, wire and cable insulation), color enhancement in precious stones (diamonds) on industrial scale and polymer curing, grafting, degradation on R and D/pilot scale. The commercial success of the process enabled the private cable industry to set up accelerators at their factories. On research and development front, the accelerator is being utilized to develop new polymer blends for high temperature applications, for solid and liquid waste treatment, polypropylene grafting experiments for uranium extraction from sea water, surface curing etc. This paper gives

  5. TPLC-32 based alarm annunciation system for Dhruva

    International Nuclear Information System (INIS)

    The Control and Instrumentation (C and I) Systems of Dhruva Research Reactor have been designed in late seventies and are facing not only obsolescence but have limited diagnostic features. Since the expected life of C and I systems is typically twenty years, it was considered appropriate to upgrade some of the major systems including Alarm Annunciation System (AAS). The AAS of Dhruva is a Safety Class IB system that is used for processing alarm inputs and alerting the Main Control Room operator by driving LED based windows and audio annunciation in the Main Control Room. The AAS is also used for sequencing and logging of alarms on Operator Console. AAS is designed using qualified configurable platform Trombay Programmable Logic Controller-32 (TPLC-32) indigenously developed in BARC. The platform based design provides complete configurability, such that it can be used to build different systems for diverse applications. The AAS for Dhruva is first TPLC-32 based system to be deployed in any Indian Nuclear Reactor. The entire cycle involved conceptualization of system, making system requirement specifications, detailing the concept, design, fabrication, creation of test facilities, testing, validation of system performance, preparation of various documents for the regulatory safety clearances, installation and commissioning of the systems. This upgrade of AAS has helped enhancing safety, mitigates obsolescence and provided improved O and M features. Executing this upgrade in operating reactor posed additional constraints such as high level of safety, limited down time etc and this could be addressed through long term planning and implementation strategies based on innovative ideas and previous experience in installation and commissioning. Being an in-house product, long-term support for maintenance mitigating the obsolescence and technology up gradation is ensured. This paper provides technical information on AAS system design, its important features, the testing

  6. Structural and large magnetocaloric properties of La0.67-xYxBa0.23Ca0.1MnO3 perovskites (0≤x≤0.15)

    Science.gov (United States)

    Abassi, Mounira; Dhahri, N.; Dhahri, J.; HLIL, E. K.

    2014-09-01

    La0.67Ba0.23Ca0.1MnO3 doped with different amounts of yttrium (Y) result in the series La0.67-xYxBa0.23Ca0.1MnO3 (LYBCMO) (x=0.00, 0.05, 0.10 and 0.15) which was synthesized by conventional solid state ceramics route. All samples show a rhombohedral structure (space group R3 barc) at room temperature. A transition from a paramagnetic to a ferromagnetic phase is observed at Curie temperature, TC. It has been found that the substitution of Y on the La site causes a reduction in TC. Analyses of crystallographic data suggested a strong correlation between structural properties and magnetism. As an example, a relationship between the distortion of MnO6 octahedron and the reduction in Curie temperature. The magnetic entropy change (-ΔS)m was estimated from isothermal magnetization curves. It decreases from 4.91 J/kg K at 350 k (x=0.00) to 4.14 J/kg K at 289 K (x=0.15) with the increase of Y content under μ0H=5 T. The relative cooling power (RCP) is found to be 365 J/kg for La0.67Ba0.23Ca0.1MnO3 and 288 J/kg for La0.52Y0.15Ba0.23Ca0.1MnO3 in the magnetic field change of 5 T. From these results, La0.67-xYxBa0.23Ca0.1MnO3 materials are strongly suggested for use as active refrigerants in magnetic refrigeration technology at near room temperature.

  7. Studies on pretreatment of sea water using multichannel ceramic elements

    International Nuclear Information System (INIS)

    Full text: Sea water reverse osmosis (SWRO) has been accepted as a promising technology for future solution of water needs on global scale. RO feed water requires a SDI of 2 using a single element modules consisting of single channel (39% porosity) and two types of 19-channel (23.5% and 30% porosity) ceramic elements. Three different types of feed viz. DI water (0.3 NTU), saline (25,900 TDS) and turbid river water (94.8 NTU) and iron contaminated ground water (115 NTU) were used to study the permeability in cross flow microfiltration mode. Bench scale experiments using single element modules showed that a turbidity removal of 68 to 99.9% can be achieved using feed of turbidity 95- 115 NTU with a flux of 300 to 625 LMH. A permeate turbidity of around 1 NTU can be obtained using two types of ceramic elements, The cake resistance was calculated for different types of ceramic elements and the effect of porosity as well as feed water turbidity was studied. Experiments were also carried out at RO pilot plant of Desalination Div., BARC using a pilot module (1.7 m2 area) containing 7 nos. 19-channel ceramic tubes of 1 metre length with two types of feed water viz. service water (7.5 NTU) and partially treated sea water (27 NTU). A short run of the pilot module showed of around 325 LPH at 1.25 kg/cm2TMp with a higher permeate turbidity (around 5 NTU) using pretreated sea water

  8. Structural integrity aspects of reactor safety

    International Nuclear Information System (INIS)

    The overall goal of nuclear power plant safety is to protect individuals, society and the environment from undue radiological hazard so that nuclear power production does not significantly add to the health risks to which individuals and society are already exposed. This paper addresses the safety principles followed during the design phase of life cycle of a nuclear power plant. The principles followed such as safety classification, design rules based on failure modes, detailed stress analysis, stress categorization, consideration of design basis events, failure probability, flaw tolerance, leak-before-break are described. Engineering structures always contain flaws, albeit of very small size. Fatigue and fracture are the two important failure modes affected by flaws. Thus flaw tolerance becomes very important. This is assessed by applying fracture mechanics principles. The R6 procedure, which is used for evaluation of structures containing flaws, has been incorporated in the software BARC-R6. Improvements by way of shell-nozzle junction pull-out, adoption of hot wire GTAW with narrow gap technique have been brought out. Post Fukushima incidence, resistance to seismic loading and containment design have assumed great importance. The paper describes these aspects in detail. Regulatory aspects of seismic design regarding siting, Seismic margin assessment, base isolation, retrofitting are the aspects covered under seismic design. Under the action of seismic loading, the piping in a nuclear power plant piping is vulnerable to a phenomenon called ratcheting. The process of seismic margin assessment and consideration of ratchetting has been backed up by a large experimental data. The experiments carried out on structures and piping components form a part of the paper. (author)

  9. Feasibility of Natore Rubber Dam on Mahanonda River in Bangladesh and its Performance on Irrigation

    Directory of Open Access Journals (Sweden)

    Md. Sazadul Hasan

    2016-07-01

    Full Text Available Low rainfall in winter causes a great problem on irrigation. Bangladesh Agricultural Research Council (BARC started research on this problem from 1974. In 1994-95, Rubber Dam projects have been taken by BIC (Beijing IWHR Corporation in Bangladesh as it is very convenience and effective in both irrigation and cultivation of crops in winter. After installing, it is very important and challenging task to study the suitability and effect of Rubber Dam on agriculture. In this research work, the analysis of Rubber Dam in Natore, Bangladesh and its suitability on Mahanonda River has been analyzed and also studied its performance on irrigation. Also Bakkhali and Idgaon Rubber Dam were analyzed for the performance evaluation of Rubber Dam projects in Bangladesh for irrigation development. Then, feasibility of Natore Rubber Dam was studied and briefly discussed about its probable effect and benefit on agriculture. Reservoir capacity was also determined on the basis of a theoretical concept known as flow mass curve. Results of performance evaluation in irrigation were expressed in three groups: hydraulic, agricultural and socio-economic. Results of the analyses of hydraulic indicators showed that water supply is available. Agricultural performance, evaluated in terms of irrigated area was satisfactory. Analyses of socio-economic indicators showed that the Rubber Dam projects were financially viable in terms of profitability of farmers. Finally results were found that, it has a great probable effect on national economic and thus an alteration method of irrigation instead of uses of ground water. Thus, a comparative capital and operation and management cost analyses of different irrigation technologies has been carried out to ascertain the viability of Rubber Dam technology in irrigation development.

  10. Post irradiation examination of thermal reactor fuels

    Science.gov (United States)

    Sah, D. N.; Viswanathan, U. K.; Ramadasan, E.; Unnikrishnan, K.; Anantharaman, S.

    2008-12-01

    The post irradiation examination (PIE) facility at the Bhabha Atomic Research Centre (BARC) has been in operation for more than three decades. Over these years this facility has been utilized for examination of experimental fuel pins and fuels from commercial power reactors operating in India. In a program to assess the performance of (U,Pu)O 2 MOX fuel prior to its introduction in commercial reactors, three experimental MOX fuel clusters irradiated in the pressurized water loop (PWL) of CIRUS up to burnup of 16 000 MWd/tU were examined. Fission gas release from these pins was measured by puncture test. Some of these fuel pins in the cluster contained controlled porosity pellets, low temperature sintered (LTS) pellets, large grain size pellets and annular pellets. PIE has also been carried out on natural UO 2 fuel bundles from Indian PHWRs, which included two high burnup (˜15 000 MWd/tU) bundles. Salient investigations carried out consisted of visual examination, leak testing, axial gamma scanning, fission gas analysis, microstructural examination of fuel and cladding, β, γ autoradiography of the fuel cross-section and fuel central temperature estimation from restructuring. A ThO 2 fuel bundle irradiated in Kakrapar Atomic Power Station (KAPS) up to a nominal fuel burnup of ˜11 000 MWd/tTh was also examined to evaluate its in-pile performance. The performance of the BWR fuel pins of Tarapur Atomic Power Stations (TAPS) was earlier assessed by carrying out PIE on 18 fuel elements selected from eight fuel assemblies irradiated in the two reactors. The burnup of these fuel elements varied from 5000 to 29 000 MWd/tU. This paper provides a brief review of some of the fuels examined and the results obtained on the performance of natural UO 2, enriched UO 2, MOX, and ThO 2 fuels.

  11. Chemistry in the front end and back end of thorium fuel cycle

    International Nuclear Information System (INIS)

    Microsphere impregnation technique has been developed for fabrication of Thoria based fuels in Fuel Chemistry Division. The process optimization was carried out to get homogeneous distribution of uranium in thoria. A simple and fast method for the dissolution of sintered ThO2 and (UxTh1-x)O2 (sintered at 1600-1700°C and with approx. 94% of the theoretical density) and separation of thorium and uranium from the solution was developed by reacting the oxides with ammonium nitrate at 360°C. Analytical method was developed for determination of relative amounts of U and Th in MOX by using TXRF method. Extensive studies on phase diagram and thermophysical properties of thoria based fuels were carried out in a wide composition and temperature range. For reprocessing studies, a large number of amides (12 nos.) was evaluated for their extraction behavior with respect to U/Th separation and it was concluded that branched alkyl chain amide, di-2-ethylhexyl isobutyramide (D2EHIBA), is a promising candidate for the selective separation of 233U from irradiated Th. Thermal and thermodynamic stability of Phosphate based inert matrix was also studied for its application for waste immobilization of thoria based fuels. With respect to molten salt reactor system, thermal behavior, thermodynamic properties and phase diagrams of Th-F, U-F, Th-U-F, Th-O-F systems were investigated. A high temperature and hydroflourination facility has been set up for preparation and purification of thorium based fluoride salts. This lecture will address some of the developments in the above field of research carried out in Radiochemistry and Isotope Group of BARC

  12. Radioaerosol lung scanning in chronic obstructive pulmonary disease (COPD) and related disorders

    International Nuclear Information System (INIS)

    As a coordinated research project of the International Atomic Energy Agency (IAEA), a multicentre joint study on radioaerosol lung scan using the BARC nebulizer has prospectively been carried out during 1988-1992 with the participation of 10 member countries in Asia [Bangladesh, China, India, Indonesia, Japan, Korea, Pakistan, Philippines, Singapore and Thailand]. The study was designed so that it would primarily cover chronic obstructive pulmonary disease (COPD) and the other related and common pulmonary diseases. The study also included normal controls and asymptomatic smokers. The purposes of this presentation are three fold: firstly, to document the usefulness of the nebulizer and the validity of user's protocol in imaging COPD and other lung diseases; secondly, to discuss scan features of the individual COPD and other disorders studied and thirdly, to correlate scan alterations with radiographic findings. Before proceeding with a systematic analysis of aerosol scan patterns in the disease groups, we documented normal pattern. The next step was the assessment of scan features in those who had been smoking for more than several years but had no symptoms or signs referable to airways. The lung diseases we analyzed included COPD [emphysema, chronic bronchitis, asthma and bronchiectasis], bronchial obstruction, compensatory overinflation and other common lung diseases such as lobar pneumonia, tuberculosis, interstitial fibrosis, diffuse panbronchiolitis, lung edema and primary and metastatic lung cancers. Lung embolism, inhalation bums and glue-sniffer's lung are separately discussed by Dr. Sundram of Singapore elsewhere in this book. The larger portion of this chapter is allocated to the discussion of COPD with a special effort made in sorting out differential scan features. Diagnostic criteria in individual COPD were defined for each category of disease and basic clinical symptoms and signs and pertinent laboratory data as well as radiographic manifestations are

  13. Plasma coating used to evaluate resistance against flow accelerated corrosion on carbon steel feeder pipe material for pressurized heavy water reactor

    International Nuclear Information System (INIS)

    A collaborative study on plasma nitriding was initiated by Water and Steam Chemistry Division, BARC Facilities, Kalpakkam, with FCIPT, a division of Institute of Plasma Research. In order to control the influence of Flow Accelerated Corrosion (FAC) on feeder pipe of PHWR reactor, coating by plasma nitriding process was carried out inside the pipe as a remedy.This is one of the methods to control the wall thickness reduction of carbon steel feeder pipe and the influence of FAC in PHWR (Pressurized heavy water reactor). Specimen of 15 mm NB Sch 80 straight pipe length of 100 mm pipe module section of low carbon steel ASTM 106 Gr. B were plasma nitrided at FCIPT, IPR for optimization of the process parameters. The wall thickness of the sample was measured axially and circumferentially by Ultrasonic thickness gauge with specific marking with templates before carrying out plasma nitriding process. During plasma nitriding the temperature was maintained at 520 °C for 24 hours. The samples after coating were checked for thickness variation by Raman spectroscopy as well as microscopy, and it was found that the coating was uniform and coating consisted of iron nitrides only. For functional test, to check the corrosion resistance, a specimen holder was designed and fabricated for the treated specimen such that it can withstand a velocity of 7 m/s. The holder was mounted in SIM loop outlet of heater. The SIM loop was maintained at 120 °C and 7 m/s for about 30 days with less than 20 ppb dissolved oxygen condition. Preliminary experiments on plasma nitriding have been carried out and checked in SIM loop in order to check the resistance to FAC under neutral pH condition. (author)

  14. An improved permanent magnet quadrupole design with larger good field region for high intensity proton linacs

    Science.gov (United States)

    Mathew, Jose V.; Rao, S. V. L. S.; Krishnagopal, S.; Singh, P.

    2013-11-01

    The Low Energy High Intensity Proton Accelerator (LEHIPA), being developed at the Bhabha Atomic Research Centre (BARC) will produce a 20 MeV, 30 mA, continuous wave (CW) proton beam. At these low velocities, space-charge forces dominate, and could lead to larger beam sizes and beam halos. Hence in the design of the focusing lattice of the LEHIPA drift tube linac (DTL) using permanent magnet quadrupoles (PMQs), a larger good field region is preferred. Here we study, using the two dimensional (2D) and three dimensional (3D) simulation codes PANDIRA and RADIA, four different types of cylindrical PMQ designs: 16-segment trapezoidal Halbach configuration, bullet-nosed geometry and 8- and 16-segment rectangular geometries. The trapezoidal Halbach geometry is used in a variety of accelerators since it provides very high field gradients in small bores, while the bullet-nosed geometry, which is a combination of the trapezoidal and rectangular designs, is used in some DTLs. This study shows that a larger good field region is possible in the 16-segment rectangular design as compared to the Halbach and bullet-nosed designs, making it more attractive for high-intensity proton linacs. An improvement in good-field region by ˜16% over the Halbach design is obtained in the optimized 16-segment rectangular design, although the field gradient is lower by ˜20%. Tolerance studies show that the rectangular segment PMQ design is substantially less sensitive to the easy axis orientation errors and hence will be a better choice for DTLs.

  15. Cold-fusion as safe and hazardless energy-source of the 21st century

    International Nuclear Information System (INIS)

    Out of the two processes for nuclear-energy; nuclear-fission is plagued with problem of nuclear-radiation hazard, whereas though nuclear-fusion is safe but almost impossible to be done on earth specially at room- temperature. In 1989, two scientists Fleischmann and Pons in USA proposed a table-top, room temperature electrolysis-experiment of heavy-water with palladium-electrode; this is commonly called cold-fusion wherein nuclear-fusion is said to be taking place. This created a big storm and controversy in the scientific community. Initially the cold-fusion was heavily criticized and several objections (such as: non-reproducibility, non-observation of telltale signature of nuclear-reaction) were raised. The research-work of McKubre and others have clarified the objections and have established that for cold-fusion to take place certain threshold conditions (such as purity of electrode, current-density, deuterium to palladium loading ratio) needs to be satisfied. In due course of time, the Truth prevailed and the cold-fusion got more and more support by many scientists in several countries including India (BARC historic role has been appreciated worldwide). Biggest objection, however, was lack of a proper theory for how Coulomb-repulsion is overcome in cold-fusion. A possible explanation for how the Coulomb-repulsion is overcome, is given in this paper; which is based on a new-found Gupta-Dinu effect, which is a natural outcome of special-relativity via modification in Lorentz force formula. The recent nuclear-accidents have raised international-opinion against nuclear-fission, whereas sin-like hot-fusion on earth is not possible. Now it seems that ultimately it is the cold-fusion which will provide hazardless neat and cheap energy for the 21st century and India could play a leading role in this direction. (author)

  16. Design, fabrication, erection, commissioning and operation of pulsed perforated plate solvent extraction columns for commercial scale reprocessing application. Contributed Paper IT-14

    International Nuclear Information System (INIS)

    The nuclear energy program of India is based on the closed fuel cycle and the reprocessing of spent nuclear fuel plays a vital role in closing the fuel cycle and thus realization of our energy targets. In a reprocessing plant, the spent fuel is processed to recover and purify the valuable nuclear materials U and Pu to the acceptable level of quality for reuse in reactors. Reprocessing is viewed as a versatile technology encompassing almost all 'Unit Operations' and 'Processes' of chemical engineering. The PUREX process is primarily based on multicomponent solvent extraction using tri-Butyl Phosphate (TBP) diluted with n-dodecane as solvent. The objective of reprocessing could only be realized by the proper selection and sizing/design of mass transfer devices. Pulsed perforated plate extraction columns are used for mass transfer operations for reprocessing of spent nuclear fuel from thermal reactors due to the advantage of maintenance free remote operation, precise control of operating parameters and ease of cleaning and decontamination, which are the requirements of reprocessing plants. In addition, enhanced mass transfer performance is achieved in pulsed column with recovery of Pu and U higher than 99.9%, meeting the international standard. Pulsed columns have been in use for more than 40 decades and are operator friendly. A decision was taken in 1958 to reprocess the spent fuel and the first reprocessing plant was commissioned at BARC, Trombay in 1964. Subsequently, plants of higher capacity were designed, constructed and are in operation in Trombay, Kalpakkam and Tarapur. A new reprocessing plant is in advance stage of construction at Kalpakkam and another Integrated Nuclear Recycle Plant using the state of the art technology is in design stage at Tarapur. This indicates the rapid expansion of reprocessing program and the Indian policy is to reprocess all spent fuel discharged from reactors

  17. Experimental studies on heat transfer and pressure drop in pebble bed test facility

    International Nuclear Information System (INIS)

    Indian program for development of high temperature reactor and its utilization to supply process heat aimed to develop alternate fuel carrier to substitute petroleum based transport fuel, which has very small reserves in India and results in large import bills. Hydrogen is an attractive energy carrier for transport applications. It can be produced by splitting water which requires either electricity or process heat at high temperatures or both depending upon the process selected. BARC is carrying out design of a 600 MWth reactor capable of supplying process heat at around 1000 °C as required for hydrogen production. For this reactor various design options with respect to fuel configurations, such as prismatic bed and pebble bed were considered for thermal hydraulics analysis. Coolant options such as molten lead and molten salt were analyzed. Studies carried out indicate selection of pebble bed reactor core with molten salt as coolant. Thermal-hydraulic studies are required for pebble bed reactor. With this in view, a pebble bed test facility has been setup to study the heat transfer and pressure drop in pebble bed. Water is used as a working medium for the facility. The paper deals with the description of the pebble bed test facility and the experimental results of heat transfer and pressure drop. It also deals with the assessment of correlations for heat transfer and pressure drop in pebble bed geometry. Pressure drop experiments in the pebble bed test facility have been performed for Raynolds number ranges from 3000-12000. Various pressure drop correlations have been compared with the experimental data. It has been found that that the correlation given by Leva et. al. matches well with the experimental data. Various heat transfer correlations have also been compared. Heat transfer experiments are nearing completion

  18. 住院患者医院感染临床及病原学结果调查分析%Clinical and etiologic survey on nosocomial infections of inpatients

    Institute of Scientific and Technical Information of China (English)

    邓先芳

    2007-01-01

    目的 探讨综合性医院住院患者医院感染的临床特点,以采取相关的有效防治措施.方法 采用前瞻性和回顾性结合的调查方法,对我院93680例住院患者的临床资料进行分析,细菌鉴定采用荷兰Organon Teknika公司生产的BarcT/Aiert 240系统检测仪及其配套的成人需氧瓶、小儿需氧瓶;法国生物梅里埃公司生产的api staph和ATB STAPH5试剂条,API 20C AUX酵母菌鉴定系统及ATB-Fungus药敏试验盒.结果 医院总例次感染率为3.22%,其中以呼吸道最高,其次为泌尿、皮肤软组织;临床分离的致病菌为革兰氏阴性菌为主,占51.16%;真菌占35.65%;革兰氏阳性菌占13.19%.比较本院2000~2005年医院感染,条件致病菌构成比呈上升趋势.结论 医院感染中条件致病菌有增高趋势,加强医院感染管理,积极治疗原发病,减少侵袭性操作,及时病原菌监测,合理使用抗菌药物是降低医院感染的有效措施.

  19. Web based remote instrumentation and control

    International Nuclear Information System (INIS)

    The Web-based technology provides a very powerful communication medium for transmitting effectively multimedia information containing data generated from various sources, which may be in the form of audio, video, text, still or moving images etc. Large number of sophisticated web based software tools are available that can be used to monitor and control distributed electronic instrumentation projects. For example data can be collected online from various smart sensors/instruments such as images from CCD camera, pressure/ humidity sensor, light intensity transducer, smoke detectors etc and uploaded in real time to a central web server. This information can be processed further, to take control action in real time from any remote client, of course with due security care. The web-based technology offers greater flexibility, higher functionality, and high degree of integration providing standardization. Further easy to use standard browser based interface at the client end to monitor, view and control the desired process parameters allow you to cut down the development time and cost to a great extent. A system based on a web client-server approach has been designed and developed at Computer division, BARC and is operational since last year to monitor and control remotely various environmental parameters of distributed computer centers. In this paper we shall discuss details of this system, its current status and additional features which are currently under development. This type of system is typically very useful for Meteorology, Environmental monitoring of Nuclear stations, Radio active labs, Nuclear waste immobilization plants, Medical and Biological research labs., Security surveillance and in many such distributed situations. A brief description of various tools used for this project such as Java, CGI, Java Script, HTML, VBScript, M-JPEG, TCP/IP, UDP, RTP etc. along with their merits/demerits have also been included

  20. Evaluation of SCAA mask technology as a pathway to the 65-nm node

    Science.gov (United States)

    Beach, James V.; Petersen, John S.; Maslow, Mark J.; Gerold, David J.; McCafferty, Diane C.

    2003-06-01

    This study takes an integrated approach utilizing a combination of high NA 193 nm lithography, a sidewall chrome alternating aperture (SCAA) phase shift mask, optical proximity correction (OPC) and customized illumination in an attempt to demonstrate the feasibility of using 193 nm lithography to support the 65 nm node. A SCAA mask was designed and built with line/space patterns ranging in pitch from 300 nm down to 140 nm. A range of mask biases were applied to the zero and pi spaces in order to examine to response of the lithography to a combination of the SCAA approach and asymmetric biasing. In combination to the asymmetric biasing, overlay bracketing was applied in order to measure the chrome overlay tolerances of the mask. Simulations suggested that an unconventionally small sigma of 0.15 would be the optimum coherence for a high 193 nm optical system. A custom 0.15 sigma partial coherence illuminator was, therefore, built and installed in the experimental ASML Micrascan V 0.75 NA 193 nm scanner. Wafers were exposed using 190 nm of 193 nm resist and an organic BARC. The 70 nm 1:1 line/space patterns resolved with a depth of focus of about 0.2 μm. The 75 nm 1:1 line/space patterns showed a 0.3-0.4 μm depth of focus. Both of these process windows were limited by pattern collapse. Addressing the pattern collapse may improve the depth of focus. Comparing mask measurements to wafer measurements show that little or no asymmetric biasing in necessary to balance the pitch. Moreover, the measured pitch was stable over a focus range of at least 0.4 microns demonstrating that any phase imbalance present was not significantly affecting the observed lithography.

  1. Radiochemistry Division : annual progress report for 1978

    International Nuclear Information System (INIS)

    The research and development (R and D) activities of the Radiochemistry Division of the Bhabha Atomic Research Centre (BARC), Bombay, during 1978 are reported in the form of individual summaries under the headings: reactor chemistry, heavy element chemistry, process chemistry, radioanalytical chemistry and services, nuclear chemistry, and instrumentation. Some of the highlights of the R and D activities are: (1) preparation of microspheres of uranium oxide and uranium-thorium oxides by sol-gel process, (2) study of vaporization thermodynamics of Th and U by transpiration and boiling techniques, (3) preparation and characterisation of uranium(III) sulphates and double sulphates by X-ray, thermal and infra-red analysis, (4) extraction of trivalent actinides and lanthanides by long chain amines from chloride solutions, (5) study of radiation chemical behaviour of U(VI) in hydrochloric acid and sulphuric acid media, (6) purification and concentration of neptunium by the primary and secondary amines, (7) development of gamma spectroscopic method for determination of isotopic composition of plutonium using low energy gamma rays of plutonium isotopes, (8) standardisation of method of determination of isotopic abundances of uranium at nanogram level by thermal ionisation mass spectroscopy, (9) extraction photometric determination of Pu(IV) and Np(IV) present in mixtures, (10) study of various aspects of nuclear fission such as charge distribution, mass distribution and fragment angular momentum in low energy fission of actinides, and (11) fabrication of: (a) spark counting unit for counting fission tracks in their plastic films, (b) autoranging alpha monitor to be used with fractionating column, (c) remote pipetter for use in hot cells and (d) a thermoluminescence unit for glovebox operation. (M.G.B.)

  2. Neutron-diffraction study of structural transition and magnetic order in orthorhombic and rhombohedral La{sub 7/8}Sr{sub 1/8}Mn{sub 1-{gamma}}O{sub 3+{delta}}

    Energy Technology Data Exchange (ETDEWEB)

    Li, H F [Institut fuer Festkoerperforschung, Forschungszentrum Juelich GmbH, D-52425 Juelich (Germany); Su, Y [Institut fuer Festkoerperforschung, Forschungszentrum Juelich GmbH, D-52425 Juelich (Germany); Persson, J [Institut fuer Festkoerperforschung, Forschungszentrum Juelich GmbH, D-52425 Juelich (Germany); Meuffels, P [Institut fuer Festkoerperforschung, Forschungszentrum Juelich GmbH, D-52425 Juelich (Germany); Walter, J M [Neutron Diffraction Group of the Mineralogic-Petrological Institute of Bonn University, Research Center Juelich GmbH, MIN/ZFR, D-52425 Juelich (Germany); Skowronek, R [Neutron Diffraction Group of the Mineralogic-Petrological Institute of Bonn University, Research Center Juelich GmbH, MIN/ZFR, D-52425 Juelich (Germany); Brueckel, Th [Institut fuer Festkoerperforschung, Forschungszentrum Juelich GmbH, D-52425 Juelich (Germany)

    2007-04-30

    We report on a systematic neutron powder diffraction (NPD) study of polycrystalline La{sub 7/8}Sr{sub 1/8}Mn{sub 1-{gamma}}O{sub 3+{delta}} compounds. We investigated the structural and magnetic phases and transitions in the temperature range between 10 and 900 K for two different samples: an Ar-annealed sample with an orthorhombic Pbnm (Z = 4; O) structure at room temperature and an air-sintered sample with a rhombohedral R3-barc (Z = 2;R) structure at room temperature. At higher temperatures, above 400 K, both samples exhibit a rhombohedral structure. For the Ar-annealed sample, a Jahn-Teller (JT) transition occurs in the orthorhombic phase at about 298 K with very large variations in the Mn-O2' and Mn-O2 bond lengths and Mn-O1-Mn bond angle on cooling from 298 to 180 K. For this sample the ferromagnetic moment at 10 K in the magnetic space group Pb'n'm amounts to 3.22(5) {mu}{sub B}/Mn. In contrast, the air-sintered sample undergoes on cooling a structural transition from rhombohedral (R) to orthorhombic (O) with a mixed phase of nearly equal R and O repartition at 120 K. Ferromagnetic order develops in this sample at about 240 K with a low-temperature moment of 3.35(4) {mu}{sub B}/Mn at 10 K. The coherent JT distortion in its orthorhombic phase occurs below some 170 K. In addition, we have determined the coherent JT distortion parameter {delta}, the tolerance factor t and the one-electron bandwidth W of the e{sub g}-band.

  3. Phytoremediation of 137Cs from low level nuclear waste using Catharanthus roseus

    International Nuclear Information System (INIS)

    Remediation of radionuclides has been carried out using the phytoremediation technology. The green plants have been screened for the uptake potential of radionuclide and found that Catharanthus roseus has the high potential for radionuclides in particular 137Cs. Low level nuclear waste (LLNW) collected from effluent treatment plant, BARC has been characterized for physico-chemical and the presence of traces of radionuclides. LLNW was spiked with 3.7 x 104 kBqL-1 activity level of 137Cs. The plants of C. roseus were grown in (i) LLNW, (ii) 137Cs spiked LLNW and (iii) with the control. The radio activities were measured in the solution at the intervals of 0, 1, 2, 3, 6, 8 and 15 days in triplicate set of the experiment. The plants were harvested after the growth. The depletion of 137Cs in LLNW was found to be 19, 21, 24, 38, 60 and 76% at intervals of 1, 2, 3, 6, 8 and 15 days, respectively. The bio-accumulation of 137Cs has been measured in the roots and shoots of the harvested plants. The activity of 137Cs was found higher in shoots (998 kBq g-1 dw) as compared to the roots (735 kBq g-1 dw). The uptake of radionuclide-137Cs, bio-accumulation in the shoot via the active transport from the root, shows the high efficiency and potentiality of C. roseus for the remediation of radionuclide. The bio-accumulation of 137Cs in the shoot will remediate the radionuclide contamination from LLNW. C. roseus can also be made applicable for effective remediation of radionuclides present in the LLNW. (author)

  4. An improved permanent magnet quadrupole design with larger good field region for high intensity proton linacs

    International Nuclear Information System (INIS)

    The Low Energy High Intensity Proton Accelerator (LEHIPA), being developed at the Bhabha Atomic Research Centre (BARC) will produce a 20 MeV, 30 mA, continuous wave (CW) proton beam. At these low velocities, space-charge forces dominate, and could lead to larger beam sizes and beam halos. Hence in the design of the focusing lattice of the LEHIPA drift tube linac (DTL) using permanent magnet quadrupoles (PMQs), a larger good field region is preferred. Here we study, using the two dimensional (2D) and three dimensional (3D) simulation codes PANDIRA and RADIA, four different types of cylindrical PMQ designs: 16-segment trapezoidal Halbach configuration, bullet-nosed geometry and 8- and 16-segment rectangular geometries. The trapezoidal Halbach geometry is used in a variety of accelerators since it provides very high field gradients in small bores, while the bullet-nosed geometry, which is a combination of the trapezoidal and rectangular designs, is used in some DTLs. This study shows that a larger good field region is possible in the 16-segment rectangular design as compared to the Halbach and bullet-nosed designs, making it more attractive for high-intensity proton linacs. An improvement in good-field region by ∼16% over the Halbach design is obtained in the optimized 16-segment rectangular design, although the field gradient is lower by ∼20%. Tolerance studies show that the rectangular segment PMQ design is substantially less sensitive to the easy axis orientation errors and hence will be a better choice for DTLs. -- Highlights: • An improved permanent magnet quadrupole (PMQ) design with larger good field region is proposed. • We investigate four PMQ designs, including the widely used Halbach and bullet nosed designs. • Analytical calculations are backed by 2D as well as 3D numerical solvers, PANDIRA and RADIA. • The optimized 16 segment rectangular PMQ design is identified to exhibit the largest good field region. • The effect of easy axis orientation

  5. Dosimetric characteristics of a PIN diode for radiotherapy application.

    Science.gov (United States)

    Kumar, R; Sharma, S D; Philomina, A; Topkar, A

    2014-08-01

    The PIN diode developed by Bhabha Atomic Research Centre (BARC) was modified for its use as a dosimeter in radiation therapy. For this purpose the diode was mounted on a printed circuit board (PCB) and provided with necessary connections so that its response against irradiation can be recorded by a standard radiotherapy electrometer. The dosimetric characteristics of the diode were studied in Co-60 gamma rays as well as high energy X-rays. The measured sensitivity of this PIN diode is 4 nC/cGy which is about ten times higher than some commercial diode dosimeters. The leakage current from the diode is 0.04 nA. The response of the PIN diode is linear in the range of 20-1000 cGy which covers the full range of radiation dose encountered in radiotherapy treatments. The non-linearity of the diode response is 3.5% at 20 cGy and it is less than 1.5% at higher dose values. Its repeatability is within 0.5%. The angular response variation is about 5.6% within 6608 with respect to normal beam incidence. The response of the PIN diode at 6 and 18 MV X-rays varies within 2% with respect to its response at Co-60 gamma rays. The source to surface distance (SSD) dependence of the PIN diode was studied for Co-60 beam. It was found that the response of the diode decreases almost linearly relative to given dose for beams with constant collimator setting but increasing SSD (decreasing dose-rate). Within this study the diode response varied by about 2.5% between the maximum and minimum SSD. The dose-rate dependence of the PIN diode for 6 and 15 MV-rays was studied. The variation in response of diode for both energies in the studied dose range is less than 1%. The field size dependence of the PIN diode response is within 1% with respect to the response of ionisation chamber. These studies indicate that the characteristics of the PIN diode are suitable for use in radiotherapy dosimetry. PMID:24325130

  6. Design of multileaf collimator (MLC) for a telecobalt machine-Monte Carlo simulation

    International Nuclear Information System (INIS)

    Telecobalt units are widely used in developing countries for cancer treatment and are preferred over medical linear accelerators because of: i) low cost, ii) low maintenance cost, iii) lower power requirements, and iv) less down time. In India majority of teletherapy machines are telecobalt. Therefore considering larger requirements of the telecobalt machines in cancer care, Bhabha Atomic Research Centre (BARC), Mumbai has developed a telecobalt machine model Bhabhatron-II. Bhabhatron-II telecobalt machine uses block type collimators which can define either square or rectangular radiation fields. Since tumours are of irregular shapes and sizes, therefore irradiation of healthy tissues surrounding the tumour in the field defined by the block type of adjustable collimators are inevitable. In order to decrease the normal tissue complication and enhance the tumour control probability, conformity of the tumour volume becomes essential which can be obtained if Bhabhatron-II telecobalt machine could be augmented with multileaf collimator (MLC). Replacement of block type collimators by MLC in a telecobalt machine will also eliminate the necessity of fabricating individualized shielding blocks required for defining irregular fields. Considering this advantage of MLC, an attempt was made to explore the possibility of designing a secondary MLC for upgrading the indigenously developed Bhabhatron-II telecobalt machine for effective patient dose delivery. The results of this study indicate that (i) Radiation field sizes are achievable up to 35x35 cm2 with accuracy well within the prescribed tolerance limits (1 mm for Field size 10x10 cm2 and 2 mm for field size > 10x10 cm2); (ii) Flatness values were found in the range of 1.8 to 3.0% and symmetry were found in the range of 0.02 to 0.34% which are well within acceptable tolerance limits of ±3%; (iii) Penumbra varies from 9 mm (smaller field size) to 15.16 mm (large field) which are acceptable for telecobalt beam; (iv) the

  7. Intercomparison of techniques for inspection and diagnostics of heavy water reactor pressure tubes: Flaw detection and characterization [Phase 1

    International Nuclear Information System (INIS)

    Nuclear power plants with heavy water reactors (HWRs) comprise nine percent of today's operating nuclear units, and more are under construction. Efficient and accurate inspection and diagnostic techniques for various reactor components and systems are an important factor in assuring reliable and safe plant operation. To foster international collaboration in the efficient and safe use of nuclear power, the IAEA conducted a Coordinated Research Programme (CRP) on Inter-comparison of Techniques for HWR Pressure Tube Inspection and Diagnostics. This CRP was carried out within the frame of the IAEA Department of Nuclear Energy's Technical Working Group on Advanced Technologies for HWRs (the TWG-HWR). The TWG-HWR is a group of experts nominated by their governments and designated by the IAEA to provide advice and to support implementation of the IAEA's project on advanced technologies for HWRs. The objective of the CRP was to inter-compare non-destructive inspection and diagnostic techniques, in use and being developed, for structural integrity assessment of HWR pressure tubes. During the first phase of this CRP, participants have investigated the capability of different techniques to detect and characterize flaws. During the second phase of this CRP, participants collaborated to detect and characterize hydride blisters and to determine the hydrogen concentration in Zirconium alloys. The intent was to identify the most effective pressure tube inspection and diagnostic methods, and to identify further development needs. The organizations that have participated in this CRP are: - The Comision Nacional de Energia Atomica (CNEA), Argentina; - Atomic Energy of Canada Ltd. (AECL); Chalk River Laboratories (CRL), Canada; - The Research Institute of Nuclear Power Operations (RINPO), China National Nuclear Corporation (CNNC), China; - Bhabha Atomic Research Centre (BARC), India; - The Korea Electric Power Research Institute (KEPRI), Republic of Korea; - The Korea Atomic Energy

  8. Cell Killing Mechanisms and Impact on Gene Expression by Gemcitabine and 212Pb-Trastuzumab Treatment in a Disseminated i.p. Tumor Model.

    Science.gov (United States)

    Yong, Kwon Joong; Milenic, Diane E; Baidoo, Kwamena E; Brechbiel, Martin W

    2016-01-01

    In pre-clinical studies, combination therapy with gemcitabine and targeted radioimmunotherapy (RIT) using 212Pb-trastuzumab showed tremendous therapeutic potential in the LS-174T tumor xenograft model of disseminated intraperitoneal disease. To better understand the underlying molecular basis for the observed cell killing efficacy, gene expression profiling was performed after a 24 h exposure to 212Pb-trastuzumab upon gemcitabine (Gem) pre-treatment in this model. DNA damage response genes in tumors were quantified using a real time quantitative PCR array (qRT-PCR array) covering 84 genes. The combination of Gem with α-radiation resulted in the differential expression of apoptotic genes (BRCA1, CIDEA, GADD45α, GADD45γ, IP6K3, PCBP4, RAD21, and p73), cell cycle regulatory genes (BRCA1, CHK1, CHK2, FANCG, GADD45α, GTSE1, PCBP4, MAP2K6, NBN, PCBP4, and SESN1), and damaged DNA binding and repair genes (BRCA1, BTG2, DMC1, ERCC1, EXO1, FANCG, FEN1, MSH2, MSH3, NBN, NTHL1, OGG1, PRKDC, RAD18, RAD21, RAD51B, SEMA4G, p73, UNG, XPC, and XRCC2). Of these genes, the expression of CHK1, GTSE1, EXO1, FANCG, RAD18, UNG and XRCC2 were specific to Gem/212Pb-trastuzumab administration. In addition, the present study demonstrates that increased stressful growth arrest conditions induced by Gem/212Pb-trastuzumab could suppress cell proliferation possibly by up-regulating genes involved in apoptosis such as p73, by down-regulating genes involved in cell cycle check point such as CHK1, and in damaged DNA repair such as RAD51 paralogs. These events may be mediated by genes such as BRCA1/MSH2, a member of BARC (BRCA-associated genome surveillance complex). The data suggest that up-regulation of genes involved in apoptosis, perturbation of checkpoint genes, and a failure to correctly perform HR-mediated DSB repair and mismatch-mediated SSB repair may correlate with the previously observed inability to maintain the G2/M arrest, leading to cell death. PMID:27467592

  9. Double-exposure strategy using OPC and simulation and the performance on wafer with sub-0.10-μm design rule in ArF lithography

    Science.gov (United States)

    Oh, Se-Young; Kim, Wan-Ho; Yune, Hyoung-Soon; Kim, Hee-Bom; Kim, Seo-Min; Ahn, Chang-Nam; Shin, Ki-Soo

    2002-07-01

    As the pattern size becomes smaller, double or multi exposure is required unless the epochal solutions for overcoming the limits of present lithography system do appear or are discovered. ArF DET (double exposure technology) strategy based on manual OPC with in-house simulation tool, HOST (Hynix OPC simulation tool), is suggested as a possible exposure method to extend the limitation of current lithography. HOST requires no additional procedures and separate layout optimizations of each region in terms of OPC are enough. Furthermore, it is possible to change illumination condition of each region and the overlap between two regions with ease. The results from the simulation are pattern size and profile of each condition according to the defous and misregistration. 0.63 NA ArF Scanner and Clariant resist is used for wafer process. The resist was coated on Clariant organic BARC using 0.24 um thickness. Dipole illumination for cell region and annular illumination for peripheral region are used. Cell region contains 0.20 um pitch duty pattern and peripheral region 0.24 um pitch duty pattern. The boundary of two regions is investigated in view of validity of stitching itself. The layout of reticles used as the cell and peripheral region are optimized by OPC, respectively and then, additional OPC was treated to the boundary, i.e., stitching area to compensate the cross term of the boundary caused by separate and independent optimization with OPC in the cell and the peripheral regime. The final patterns were acquired by defining the cell at first and the peripheral region secondly with different defocus and registration in respect to the cell. The actual data on wafer are presented according to defocus and one region's overlay offset relatively to the other region. And the outstanding matching between simulation results and in-line data are shown. Lithography process window for stable patterning is thoroughly investigated in view of depth of focus, energy latitude

  10. Polimerni aditivi za poboljšanje tecivosti nafte i plinskog kondenzata

    Directory of Open Access Journals (Sweden)

    Jelić-Balta, J.

    2007-10-01

    structure and molecular weight of the flow improver additives for crude oils and gas condensates prepared by the authors of this review article. The additives are based on methacrylic long chain alkyl ester homopolymers or copolymers with vinyl carboxylic acids or vinyl aromatic monomers. The quality of the prepared additives as pour point depressants and rheology improvers was proved by applying them to crude oil from INA fields Števkovica, Obod and Deletovci as well as gas condensate fields Molve, Kalinovac, Stari Gradac, Gola, and Hungarian gas condensate field Barcs. The best results were obtained with the copolymers of methacrylic long-chain alkyl esters with functional monomers.

  11. Evaluation of advanced hot conditioning process for PHWRS

    International Nuclear Information System (INIS)

    Hot-conditioning/hot functional test process is carried out to the PHT system of reactor before reactor going to critical/operational. The process is aimed in checking the component functionalities at high temperature and high pressure conditions, the process also checks/removes the suspended corrosion products in heat transport circuit. This process leads to formation of a passive or corrosion oxide film on the heat transport circuit surfaces which protects/mitigates the corrosion of the system circuits during the operation of plant. Major concerned alloy in the Primary Heat Transport (PHT) system of Indian PHWRs during the hot conditioning process and also during operation is the carbon steel due to its high corrosion. Hot-conditioning process mitigates the corrosion of carbon steel by the formation of iron oxide (Fe3O4) as major oxide phase layer on the carbon steel surface with a typical thickness of 1.0 μm with particle size of 1μm after 336 h of process at 250 °C. But this passive oxide film thickness increase with time of operation of system with c.a. 10μm for 2.2 EFYP. The protectiveness of passive layer can be further enhanced by reducing the particle sizes in the passive film to nano meter range. The process can impact on the compactness of passive oxide layer with reduced pores in the oxide layer and properties of the nano nature oxide (transport properties) impacting the corrosion mitigation. The corrosion mitigation reduce the source term in the activated corrosion product generation. To achieve this a new process 'Advanced hot conditioning' was developed in water steam chemistry division, BARC for getting a passive oxide film with a lowered particle size in the passive film. The AHC process with 1g/L of PEG-8000 at 250 °C for 336 h showed a particle size <100 nm. The process was tested under the normal operating conditions as function of the time, the corrosion parameter like oxide film thickness, corrosion rate and metal ion release to

  12. Study of neodymium oxide inclusion on the structure of a borate glass

    International Nuclear Information System (INIS)

    The structure of borate glass has been well studied by many different authors using a variety of techniques. When other compounds are added to the glass which accommodates them, the structural environment of the inclusions will depend on the type of included elements. Given the large number of applications of borate glasses, a study of the factors that determine the surrounding structure of an included ion in a glass is thus of much relevance. As a first step in such studies, a single ion-type viz. neodymium oxide ( Nd2O3 ) was incorporated in a borate host glass at varying mole percentages of the dopant from 10% to 25%. These glasses were melt-quenched in air from 1450 oC. Transparent bubble-free purple glass beads were obtained and subsequently crushed into fine powders for the X-ray and neutron diffraction measurements. The glass transition temperature was approximately 750 oC. An incident wavelength of 1.54 Å ( CuKα ) was used in the X-ray diffraction studies. Neutron diffraction measurements were made on the High Q diffractometer at Dhruva Reactor, B.A.R.C., Mumbai in the Q range of 0.3 to 15 Å-1 . The diffraction patterns from both techniques showed some trends with concentration in the higher Q regions of S(Q). The real space correlation functions viz. T(r) and number density function N(r) gave clear indications of changes of nearestneighbour coordination number of O around B (at 1.366 Å) as a function of Nd2O3 molar concentration in the glass. Thus in the first peak, the fraction due to tetrahedral BO4 units increases from 28% to 41% with dopant level at the expense of BO3 triangles. From an analysis of the second peak in T(r), super-structural units such as diborate and di-pentaborate units surround the Nd ion at lower dopant levels while the coordination is octahedral at higher levels of dopant. These findings are in keeping with a model that the overall structure of the host glass is affected by the concentration of the dopant ion.

  13. Statistical reviewers improve reporting in biomedical articles: a randomized trial.

    Directory of Open Access Journals (Sweden)

    Erik Cobo

    Full Text Available BACKGROUND: Although peer review is widely considered to be the most credible way of selecting manuscripts and improving the quality of accepted papers in scientific journals, there is little evidence to support its use. Our aim was to estimate the effects on manuscript quality of either adding a statistical peer reviewer or suggesting the use of checklists such as CONSORT or STARD to clinical reviewers or both. METHODOLOGY AND PRINCIPAL FINDINGS: Interventions were defined as 1 the addition of a statistical reviewer to the clinical peer review process, and 2 suggesting reporting guidelines to reviewers; with "no statistical expert" and "no checklist" as controls. The two interventions were crossed in a 2x2 balanced factorial design including original research articles consecutively selected, between May 2004 and March 2005, by the Medicina Clinica (Barc editorial committee. We randomized manuscripts to minimize differences in terms of baseline quality and type of study (intervention, longitudinal, cross-sectional, others. Sample-size calculations indicated that 100 papers provide an 80% power to test a 55% standardized difference. We specified the main outcome as the increment in quality of papers as measured on the Goodman Scale. Two blinded evaluators rated the quality of manuscripts at initial submission and final post peer review version. Of the 327 manuscripts submitted to the journal, 131 were accepted for further review, and 129 were randomized. Of those, 14 that were lost to follow-up showed no differences in initial quality to the followed-up papers. Hence, 115 were included in the main analysis, with 16 rejected for publication after peer review. 21 (18.3% of the 115 included papers were interventions, 46 (40.0% were longitudinal designs, 28 (24.3% cross-sectional and 20 (17.4% others. The 16 (13.9% rejected papers had a significantly lower initial score on the overall Goodman scale than accepted papers (difference 15.0, 95% CI: 4

  14. Technological challenges in extractive metallurgy and refining of niobium, tantalum and preparation of their alloys

    International Nuclear Information System (INIS)

    Nb master alloy, Zr2.5%Nb, Nb47%Ti, C-103, Nb1%Zr0.1%C, Nb5%Mo1%Zr0.1%C Nb10%W, Nb10%W2.5% Zr, Ta10%W etc. These alloys are produced by electron beam melting. Towards enhancement of melting capacity of the refractory and reactive metals and alloys, a collaborative programme has been taken up with BARC for indigenization of electron beam melting furnace of capacity 300 kW. The paper gives developments, details of parameters standardized and adopted at SMP/NFC along with the experience in production of refractory metals and their alloys. (author)

  15. The 2000/60/EC Water Framework Directive and the Flooding of the Brown Coal Meirama Open Pit (NW Spain)

    Science.gov (United States)

    Delgado, J.; Juncosa, R.

    2009-04-01

    Coal mining in Galicia (NW Spain) has been an important activity which came to an end in December, 2007. Hence, for different reasons, the two large brown coal mines in Galicia (the As Pontes mine, run by ENDESA GENERACIÓN, and the Meirama mine, owned by Lignitos de Meirama, S.A., LIMEISA), have started closure procedures, both of which are considering the flooding of the mine pits to create two large lakes (~8 km2 in As Pontes and ~2 km2 in Meirama). They will be unique in Galicia, a nearly lake-free territory. An important point to consider as regards the flooding of the lignite mine pits in Galicia is how the process of the creation of a body of artificial water will adapt to the strict legal demands put forth in the Water Framework Directive. This problem has been carefully examined by different authors in other countries and it raises the question of the need to adapt sampling surveys to monitor a number of key parameters -priority substances, physical and chemical parameters, biological indicators, etc.- that cannot be overlooked. Flooding, in both cases consider the preferential entrance into the mine holes of river-diverted surface waters, in detriment of ground waters in order to minimize acidic inputs. Although both mines are located in the same hydraulic demarcation (i.e. administrative units that, in Spain, are in charge of the public administration and the enforcement of natural water-related laws) the problems facing the corresponding mine managers are different. In the case of Meirama, the mine hole covers the upper third part of the Barcés river catchment, which is a major source of water for the Cecebre reservoir. That reservoir constitutes the only supply of drinking water for the city of A Coruña (~250.000 inhabitants) and its surrounding towns. In this contribution we will discuss how mine managers and the administration have addressed the uncertainties derived from the implementation of the Water Framework Directive in the particular case of

  16. Cell Killing Mechanisms and Impact on Gene Expression by Gemcitabine and 212Pb-Trastuzumab Treatment in a Disseminated i.p. Tumor Model

    Science.gov (United States)

    Yong, Kwon Joong; Milenic, Diane E.; Baidoo, Kwamena E.; Brechbiel, Martin W.

    2016-01-01

    In pre-clinical studies, combination therapy with gemcitabine and targeted radioimmunotherapy (RIT) using 212Pb-trastuzumab showed tremendous therapeutic potential in the LS-174T tumor xenograft model of disseminated intraperitoneal disease. To better understand the underlying molecular basis for the observed cell killing efficacy, gene expression profiling was performed after a 24 h exposure to 212Pb-trastuzumab upon gemcitabine (Gem) pre-treatment in this model. DNA damage response genes in tumors were quantified using a real time quantitative PCR array (qRT-PCR array) covering 84 genes. The combination of Gem with α-radiation resulted in the differential expression of apoptotic genes (BRCA1, CIDEA, GADD45α, GADD45γ, IP6K3, PCBP4, RAD21, and p73), cell cycle regulatory genes (BRCA1, CHK1, CHK2, FANCG, GADD45α, GTSE1, PCBP4, MAP2K6, NBN, PCBP4, and SESN1), and damaged DNA binding and repair genes (BRCA1, BTG2, DMC1, ERCC1, EXO1, FANCG, FEN1, MSH2, MSH3, NBN, NTHL1, OGG1, PRKDC, RAD18, RAD21, RAD51B, SEMA4G, p73, UNG, XPC, and XRCC2). Of these genes, the expression of CHK1, GTSE1, EXO1, FANCG, RAD18, UNG and XRCC2 were specific to Gem/212Pb-trastuzumab administration. In addition, the present study demonstrates that increased stressful growth arrest conditions induced by Gem/212Pb-trastuzumab could suppress cell proliferation possibly by up-regulating genes involved in apoptosis such as p73, by down-regulating genes involved in cell cycle check point such as CHK1, and in damaged DNA repair such as RAD51 paralogs. These events may be mediated by genes such as BRCA1/MSH2, a member of BARC (BRCA-associated genome surveillance complex). The data suggest that up-regulation of genes involved in apoptosis, perturbation of checkpoint genes, and a failure to correctly perform HR-mediated DSB repair and mismatch-mediated SSB repair may correlate with the previously observed inability to maintain the G2/M arrest, leading to cell death. PMID:27467592

  17. Leak testing of cryogenic components — problems and solutions

    Science.gov (United States)

    Srivastava, S. P.; Pandarkar, S. P.; Unni, T. G.; Sinha, A. K.; Mahajan, K.; Suthar, R. L.

    2008-05-01

    A prototype of Cold Neutron Source (CNS) for Dhruva Reactor is being manufactured at Centre for Design and Manufacture (CDM), BARC, Mumbai for validating the mechanical and thermal engineering design aspects, besides checking the integrity of all joints and components at low temperature, 77K. Task of a Cold Neutron Source is to generate cold neutrons by cooling down the thermal neutrons, which are originally produced in a nuclear research reactor. The complete Cold Neutron Source system comprises a complex arrangement of moderator pot, transfer line (piping), pumps, refrigerators, storage tanks, a heat exchanger and associated controls and instrumentation. The heart of the system is moderator pot in which water (moderator) is cooled down by Liquid Nitrogen (LN2) being circulated through an annular cavity machined on the walls of the pot. Transfer lines for LN2 basically consist of two concentric Stainless Steel flexible pipes, which are joined to the inlet and outlet Aluminium tubes of the moderator pot through transition joints. Leak in any component may result in loss of liquid Nitrogen, degradation of vacuum, which in turn may affect the heat removal efficiency of the source. Hence, leak testing was considered a very important quality control tool and all joints and components were subjected to helium leak test using mass spectrometer leak detector (MSLD) at cryogenic temperature. During one of the earlier experiments, flow of LN2 through inner flexible pipe of the transfer line resulted in rise of pressure in the vacuum annulus and sweating on the outer flexible pipe. After investigations it was found that large thermal stress compounded with mechanical stress resulted in cracks in the inner pipe. Accordingly design was modified to get leak proof transfer line assembly. Further, during leak testing of thin wall moderator pot, gross leak was observed on the outer jacket welded joint. Leak was so large that even a small amount of Helium gas in the vicinity of the

  18. Evolution of nuclear spectroscopy at Saha Institute of Nuclear Physics

    Indian Academy of Sciences (India)

    P Mukherjee

    2001-07-01

    Experimental studies of nuclear excitations have been an important subject from the earliest days when the institute was established. The construction of 4 MeV proton cyclotron was mainly aimed to achieve this goal. Early experiments in nuclear spectroscopy were done with radioactive nuclei with the help of beta and gamma ray spectrometers. Small NaI(Tl) detectors were used for gamma–gamma coincidence, angular correlation and life time measurements. The excited states nuclear magnetic moments were measured in perturbed gamma–gamma angular correlation experiments. A high transmission magnetic beta ray spectrometer was used to measure internal conversion coefficients and beta–gamma coincidence studies. A large number of significant contributions were made during 1950–59 using these facilities. Proton beam in the cyclotron was made available in the late 1950’s and together with 14 MeV neutrons obtained from a C-W generator a large number of short-lived nuclei were investigated during 1960’s and 1970’s. The introduction of high resolution Ge gamma detectors and the improved electronics helped to extend the spectroscopic work which include on-line (,') and (,) reaction studies. Nuclear spectroscopic studies entered a new phase in the 1980’s with the availability of 40–80 MeV alpha beam from the variable energy cyclotron at VECC, Calcutta. A number of experimental groups were formed in the institute to study nuclear level schemes with (,) reactions. Initially only two unsuppressed Ge detectors were used for coincidence studies. Later in 1989 five Ge detectors with a large six segmented NaI(Tl) multiplicitysum detector system were successfully used to select various channels in (,) reactions. From 1990 to date a variety of medium energy heavy ions were made available from the BARC-TIFR Pelletron and the Nuclear Science Centre Pelletron. The state of the art gamma detector arrays in these centres enabled the Saha Institute groups to undertake more

  19. Radioaerosol Inhalation Lung Scan in Pulmonary Emphysema

    International Nuclear Information System (INIS)

    Perfusion and ventilation imagings of the lung are well established procedure for diagnosing pulmonary embolism, differentiation it from chronic obstructive lung disease, and making an early detection of chronic obstructive lung disease. To evaluate the usefulness of radioaerosol inhalation imaging (RII) in chronic obstructive lung disease, especially pulmonary emphysema, we analyzed RIIs of five normal adult non-smokers, five asymptomatic smokers (age 25-42 years with the mean 36), and 21 patients with pulmonary emphysema (age 59-78 years with the mean 67). Scintigrams were obtained with radioaerosol produced by a BARC nebuliser with 15 mCi of 99mTc-phytate. Scanning was performed in the anterior, posterior, and lateral projections after five to 10-minute inhalation of the radioaerosol on sitting position. The scans were analyzed and correlated with the results of pulmonary function studies and chest radiographs. Also lung perfusion scan with 99mTc-MAA was performed in 12 patients. In five patients, we performed follow-up scans for the evaluation of the effects of a bronchodilator. Based on the X-ray findings and clinical symptoms, pulmonary emphysema was classified into four types: centrilobular (3 patients), panlobular (4 patients), intermediate (10 patients), and combined (4 patients). RII findings were patternized according to the type, extent, and intensity of the aerosol deposition in the central bronchial and bronchopulmonary system and lung parenchyma. 10 controls, normal five non-smokers and three asymptomatic smokers revealed homogeneous parenchymal deposition in the entire lung fields without central bronchial deposition. The remaining two of asymptomatic smokers revealed mild central airway deposition. The great majority of the patients showed either central (9/21) or combined type (10/21) of bronchopulmonary deposition and the remaining two patients peripheral bronchopulmonary deposition. Parenchymal aerosol deposition in pulmonary emphysema was

  20. An improved permanent magnet quadrupole design with larger good field region for high intensity proton linacs

    Energy Technology Data Exchange (ETDEWEB)

    Mathew, Jose V., E-mail: josev.mathew@gmail.com; Rao, S.V.L.S.; Krishnagopal, S.; Singh, P.

    2013-11-01

    The Low Energy High Intensity Proton Accelerator (LEHIPA), being developed at the Bhabha Atomic Research Centre (BARC) will produce a 20 MeV, 30 mA, continuous wave (CW) proton beam. At these low velocities, space-charge forces dominate, and could lead to larger beam sizes and beam halos. Hence in the design of the focusing lattice of the LEHIPA drift tube linac (DTL) using permanent magnet quadrupoles (PMQs), a larger good field region is preferred. Here we study, using the two dimensional (2D) and three dimensional (3D) simulation codes PANDIRA and RADIA, four different types of cylindrical PMQ designs: 16-segment trapezoidal Halbach configuration, bullet-nosed geometry and 8- and 16-segment rectangular geometries. The trapezoidal Halbach geometry is used in a variety of accelerators since it provides very high field gradients in small bores, while the bullet-nosed geometry, which is a combination of the trapezoidal and rectangular designs, is used in some DTLs. This study shows that a larger good field region is possible in the 16-segment rectangular design as compared to the Halbach and bullet-nosed designs, making it more attractive for high-intensity proton linacs. An improvement in good-field region by ∼16% over the Halbach design is obtained in the optimized 16-segment rectangular design, although the field gradient is lower by ∼20%. Tolerance studies show that the rectangular segment PMQ design is substantially less sensitive to the easy axis orientation errors and hence will be a better choice for DTLs. -- Highlights: • An improved permanent magnet quadrupole (PMQ) design with larger good field region is proposed. • We investigate four PMQ designs, including the widely used Halbach and bullet nosed designs. • Analytical calculations are backed by 2D as well as 3D numerical solvers, PANDIRA and RADIA. • The optimized 16 segment rectangular PMQ design is identified to exhibit the largest good field region. • The effect of easy axis orientation

  1. Characterisation of flash X-ray source generated by Kali-1000 pulse power system

    International Nuclear Information System (INIS)

    The electron beam-driven Rod Pinch Diode (RPD) is presently fielded on KALI-1000 Pulse Power System at BARC, Visakhapatnam and is a leading candidate for future flash X-ray radiographic sources. The diode is capable of producing less than 2-mm radiation spot sizes and greater than 350 milli rads of dose measured at 1 m from the x-ray source. KALI-1000 Pulse Power Source is capable of delivering up to 600 kV using a Tesla Transformer with Demineralized Insulated Transmission Line (DITL), the diode typically operates between 250 -330 kV Since the radiation dose has a power-law dependence on diode voltage, this limits the dose production on KALI-1000 system. Radiation dose with angular variation is measured using thermoluminescent detectors (TLD's) and the X-ray spot size is measured using rolled edge and pin hole arrangement with image plate (IP) to obtain the time-integrated source profile as well as a time-resolved spot diagnostic. An X-ray pinhole camera was used to pick out where the energetic e-beam connects to the anode. Ideally the diode should function such that the radiation is emitted from the tip. The camera was mounted perpendicular to the machine's axis to view the radiation from the tip. An improved radiographic image was obtained using tungsten rolled edge and subsequent image analysis. The top portion of the IP is exposed directly to x rays and the bottom portion is effectively blocked by the rolled edge. Between these regions is the penumbral shadow region and a line-out taken across this region produces an edge spread function (ESF) profile which is used to characterize the x-ray source distribution. Interpretation of rolled edge linages from the dose produced in the interface was carried. The edge parallel to the anode rod detected a non-uniform profile. Comparison of the spot sizes of the X-ray sources obtained by the pin hole and rolled edge arrangements was carried and results obtained by both the techniques are with in 10% of the

  2. Indian advanced heavy water reactor for thorium utilisation and nuclear data requirements and status

    International Nuclear Information System (INIS)

    BARC is embarking on thorium utilisation program in a concerted and consistent manner to achieve all round capabilities in the entire Thorium cycle under the Advanced Heavy Water Reactor (AHWR) development program. Upgrading our nuclear data capability for thorium cycle is one of the main tasks of this program. This paper gives a brief overview of the physics design features of the AHWR. The basic starting point of the analysis has been the lattice simulation of the fuel cluster employing the WIMS-D4 code package with 1986 version of 69 group library. For the analysis of thorium cycle, the present multi group version contains the three major isotopes viz., 232Th, 233U and 233Pa. To correctly evaluate the fuel cycle we require many more isotopes of the Th burnup chain. With the help of NDS, IAEA, many other isotopes of interest in AHWR, actinides in the thorium burnup chain, burnable absorbers, etc., were generated. Some of them were added to the WIMS-D4 library and the results are discussed. The WIMS-D4 library is also being updated as part of the IAEA coordinated research project on Final Stage of WLUP with international cooperation. India is also taking part in CRP. The evaluation of AHWR lattice with this new library is presented. Some comments regarding the fission product data being used in WIMS libraries are given, which are tuned to U-Pu cycles. The measurements for 233U are rather old. Measurements in high energies are also very sparse. More attention by nuclear data community is required in this regard as well. India has also begun a modest program to assess the ADS concepts, with the aim of employing thermal reactor systems, such as AHWR. A one way coupled booster reactor concept is being analysed with available code systems and nuclear data. A brief summary of this concept is also being discussed in this paper. A general survey on the quality of the evaluated nuclear data of the major and minor isotopes of thorium cycle is also given. A major

  3. Evaluation of N,N-dialkylamides as promising process extractants

    International Nuclear Information System (INIS)

    Studies carried out at BARC, India on the development of new extractants for reprocessing of spent fuel suggested that while straight chain N,N-dihexyloctanamide (DHOA) is promising alternative to TBP for the reprocessing of irradiated uranium based fuels, branched chain N,N-di(2-ethylhexyl)isobutyramide (D2EHIBA) is suitable for the selective recovery of 233U from irradiated Th. In advanced fuel cycle scenarios, the coprocessing of U/Pu stream appears attractive particularly with respect to development of proliferation resistant technologies. DHOA extracted Pu(IV) more efficiently than TBP, both at trace-level concentration as well as under uranium/plutonium loading conditions. Uranium extraction behavior of DHOA was however, similar to that of TBP during the extraction cycle. Stripping behavior of U and Pu (without any reductant) was better for DHOA than that of TBP. It was observed during batch studies that whereas 99% Pu is stripped in four stages in case of DHOA, only 89% Pu is stripped in case of TBP under identical experimental conditions. DHOA offered better fission product decontamination than that of TBP. GANEX (Group ActiNide EXtraction) and ARTIST (Amide-based Radio-resources Treatment with Interim Storage of Transuranics) processes proposed for actinide partitioning use branched chain amides for the selective extraction of uranium from spent fuel feed solutions. The branched-alkyl monoamide (BAMA) proposed to be used in ARTIST process is N,N-di-(2-ethylhexyl)butyramide (D2EHBA). In this context, the extraction behavior of U(VI) and Pu(IV) were compared using D2EHIBA, TBP, and D2EHBA under similar concentration of nitric acid (0.5 - 6M) and of uranium (0-50g/L). These studies suggested that D2EHIBA is a promising extractant for selective extraction of uranium over plutonium in process streams. Similarly, D2EHIBA offered distinctly better decontamination of 233U over Th and fission products under THOREX feed conditions. The possibility of simultaneous

  4. PREFACE: 11th International Workshop on Positron and Positronium Chemistry (PPC-11)

    Science.gov (United States)

    Pujari, P. K.; Sudarshan, K.; Dutta, D.

    2015-06-01

    The International Workshop on Positron and Positronium Chemistry (PPC) is a prestigious triennial conference series with a rich history. The 11th meeting in the series (PPC-11) was held at Cidade de Goa, Goa, India during 9-14, November, 2014. It was organized by Bhabha Atomic Research Centre (BARC), Mumbai. The co-organizers were Saha Institute of Nuclear Physics (SINP), Kolkata, Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam and Indian Association of Nuclear Chemists and Allied Scientists (IANCAS), Mumbai. PPC-11 attracted participants both from academic institutions and industries. About 120 participants from 20 countries representing all continents participated in the conference. The conference continued the tradition of excellence in terms of quality of presentations and discussions. There were 33 plenary and invited talks, 39 oral presentations and 40 posters. The conference stood true to its multidisciplinary tag with papers presented in the fields of fundamentals of positron and positronium chemistry, applications in polymers, porous materials, metals/alloys, studies in liquids, biological applications as well as developments in theory and experimental techniques. The enthusiastic participation of senior researchers and young students made the scientific program a grand success. In order to encourage the student participants (twenty) and promote excellence, a committee of senior members evaluated their presentations and the top three contributions were awarded. The positron and positronium community paid homage to the memory of late Profs. J. Kristiak and A.T. Stewart. A brief sketch of their life and work was presented by Profs. Jan Kuriplach and Toshio Hyodo, respectively. All the papers published in these proceedings have been peer reviewed by the participants of PPC-11. Editors thank all the reviewers for sparing their valuable time and helping us in bringing out the proceedings with 43 contributed articles in the scheduled time. We are

  5. SNP discovery in common bean by restriction-associated DNA (RAD) sequencing for genetic diversity and population structure analysis.

    Science.gov (United States)

    Valdisser, Paula Arielle M R; Pappas, Georgios J; de Menezes, Ivandilson P P; Müller, Bárbara S F; Pereira, Wendell J; Narciso, Marcelo G; Brondani, Claudio; Souza, Thiago L P O; Borba, Tereza C O; Vianello, Rosana P

    2016-06-01

    Researchers have made great advances into the development and application of genomic approaches for common beans, creating opportunities to driving more real and applicable strategies for sustainable management of the genetic resource towards plant breeding. This work provides useful polymorphic single-nucleotide polymorphisms (SNPs) for high-throughput common bean genotyping developed by RAD (restriction site-associated DNA) sequencing. The RAD tags were generated from DNA pooled from 12 common bean genotypes, including breeding lines of different gene pools and market classes. The aligned sequences identified 23,748 putative RAD-SNPs, of which 3357 were adequate for genotyping; 1032 RAD-SNPs with the highest ADT (assay design tool) score are presented in this article. The RAD-SNPs were structurally annotated in different coding (47.00 %) and non-coding (53.00 %) sequence components of genes. A subset of 384 RAD-SNPs with broad genome distribution was used to genotype a diverse panel of 95 common bean germplasms and revealed a successful amplification rate of 96.6 %, showing 73 % of polymorphic SNPs within the Andean group and 83 % in the Mesoamerican group. A slightly increased He (0.161, n = 21) value was estimated for the Andean gene pool, compared to the Mesoamerican group (0.156, n = 74). For the linkage disequilibrium (LD) analysis, from a group of 580 SNPs (289 RAD-SNPs and 291 BARC-SNPs) genotyped for the same set of genotypes, 70.2 % were in LD, decreasing to 0.10 %in the Andean group and 0.77 % in the Mesoamerican group. Haplotype patterns spanning 310 Mb of the genome (60 %) were characterized in samples from different origins. However, the haplotype frameworks were under-represented for the Andean (7.85 %) and Mesoamerican (5.55 %) gene pools separately. In conclusion, RAD sequencing allowed the discovery of hundreds of useful SNPs for broad genetic analysis of common bean germplasm. From now, this approach provides an excellent panel

  6. Comparative studies of the global ecological state variation of the aquatic environment in the Crişuri Hydrographic Space between 2007 and 2009

    Directory of Open Access Journals (Sweden)

    Corina Sion

    2011-04-01

    noticed, although some monitoring points registered an improvement of the global ecological state, whereas others, a degradation. The improvement (eg. prelevation sections Râbiţa on Crişul Alb, Pădurea Neagră on Barcău or upstream Huedin on Crişul Repede is mainly due to the lower quantity of mis-/untreated residual water upstream the monitoring sections. The modernization of waste-water purifying stations as well the connection of the urban areas to these stations finally contributed to the improvement of the water quality upstream these polluting sources.

  7. Networking of institutions in India to promote research and education in nuclear science and engineering

    International Nuclear Information System (INIS)

    Full text: The Programme of Nuclear Energy and its Applications (NEA) is knowledge intensive requiring engineers and scientists having special education and training for its implementation. The paucity of manpower in managing this programme is partly due to limitations of the university system in catering to the needs of the nuclear industry. Those limitations arise due to several reasons, like, regulatory requirements which make it difficult to set up nuclear facilities in university environment, capital intensive nature of nuclear set-ups, paucity of teaching staff having hands-on experience and limited employment opportunities making nuclear option unattractive for talented youngsters. The Department of Atomic Energy of India (DAE) established in 1954 for shaping and managing the Indian NEA programme realized those limitations and opted for an in-house education and training programme leading to assured employment for young Engineering Graduates and Science Post Graduates. Called the Bhabha Atomic Research Centre (BARC) Training School Programme, it is in place since 1957. The Indian NEA programme is thus fortunate to be supported by a visionary human resource development (HRD) programme in nuclear science and technology practically right since its inception. The success of HRD programme of DAE lies in its broader outlook based on the premise that technology development and basic research go hand-in-hand. This outlook is reflected also in the way DAE has been managing the implementation of its programme in that on one hand it has set up centres for technological Research and Development and, on the other, it is providing Grant-in-Aid to several Institutes for carrying basic research. Moreover, DAE has not lost sight of the fact that success of its initiatives lies as much in the vibrant university system as in its own training and educational efforts. It has, therefore, created avenues for extra-mural funding for supporting research activities in universities in

  8. Safety management and effective utilization of Indian research reactors APSARA, CIRUS and DHRUVA

    International Nuclear Information System (INIS)

    to the nuclear power plants also. rack record of safety of research reactors in India has been excellent. Root cause analysis of every incident is carried out and appropriate corrective measures are implemented. Detailed surveillance and In Service Inspection programmes have been evolved based on specific reactor design and operating experience and are adhered to. Ageing of old reactors has been managed by systematic assessments and refurbishing actions. The refurbishing outage has been also utilized for making several safety upgrades to meet present day requirements, as in the case of refurbishment of the Cirus reactor. Safety improvements have been made on a continuing basis based on operating experience and new knowledge. At times, these improvements have gone beyond the requirements of design and safety analysis giving credence to the slogan AHARA 'Safety - As High As Reasonably Achievable'. or ensuring continued safety during the operating life of the research reactors a well planned safety management system is in place. There exists a well defined hierarchical structure and line of communication among operating organization, regulatory agency, health and safety organization, maintenance and services organization and various safety committees / groups, quality groups, and experimenters, to facilitate smooth functioning of the operational activities of the research reactors at BARC. The paper would outline the safety management system practiced in these research reactors. All the three research reactors have been well utilised for basic and applied research, neutron radiography, nuclear detectors testing, radioisotope production, material testing and human resource training and development. The National Facility for Neutron Beam Research (NFNBR) has been created at BARC during early nineties to cater to the needs of the Indian scientific community. Scientists from, universities and national laboratories also use these facilities in research reactors through

  9. FOREWORD: 23rd National Symposium on Plasma Science & Technology (PLASMA-2008)

    Science.gov (United States)

    Das, A. K.

    2010-01-01

    Science and Technology, for delivering the key note address to set the tenor of the symposium. I would also like to thank the Plasma Science Society of India (PSSI) for agreeing to hold this important event at BARC. Thanks are due to Dr L M Gantayet, Director, BTDG, BARC and chairman, Scientific Program Committee and all my colleagues in the Symposium Organizing Committee who have made this symposium possible. Finally, our thanks to all the Funding agencies, Board of Research in Nuclear Science, Department of Science and Technology, The Board of Fusion Research, and all industrial exhibitor and sponsors for their unstinted support and encouragement. Dr A K Das Chairman, Organizing Committee Bhabha Atomic Research Center, Mumbai

  10. Technology and knowledge management in and by the Department of Atomic Energy, India

    International Nuclear Information System (INIS)

    Full text: Indian Department of Atomic Energy (DAE) has been working right from its inception for harnessing nuclear science and technology for the development of the nation based on a well-planned strategy involving simultaneous pursuit of basic research and technology development with equal rigour. Over the years, a robust institutional framework for exploiting nuclear science and technology has been put in place. Now, in its golden jubilee year, the DAE runs major research centers, academic institutions and industrial units. Basic strategy for the development of nuclear energy programme in India was formulated at a time when India hardly possessed any infrastructure to nurture any hi-tech activity. Keeping this in view, a large R and D establishment was progressively set up. This establishment, known as Bhabha Atomic Research Centre (BARC), consists of research reactors and other facilities for research and technology development. While setting up various other institutions, the Department has ensured that an organic linkage between all the institutions is maintained, and research and development lead to deployment of technologies. To achieve this objective, the DAE, besides setting up research centres, has also set up closely linked industrial units. The resulting synergy between research, technology development and industrial application has benefited all the agencies involved. As a result of all these efforts, several radiation and isotope technologies have been developed and deployed and India is self-reliant in all aspects of nuclear fuel cycle, starting with prospecting and mining of uranium and ending with the back-end of the fuel cycle, which involves reprocessing of the spent fuel and nuclear waste management. All possible mechanisms for technology management have been adopted by the DAE to harness nuclear science and engineering. Technologies developed by R and D centers have been deployed in house. Technologies have also been transferred to industrial

  11. Physical and Chemical Limnology of the Abegondo-Cecebre reservoir, A Coruña, NW Spain

    Science.gov (United States)

    Delgado, Jordi; Cereijo-Arango, José Luis; García-Morrondo, David; Cillero-Castro, Carmen; Muñoz-Ibáñez, Andrea; Juncosa-Rivera, Ricardo

    2016-04-01

    The Abegondo-Cecebre reservoir was commissioned in 1976. It has a nominal capacity of ~23 hm3 and an actual regulation capacity of 20.6 hm3 (12.9 hm3 in rainy periods, when flood control is necessary). This reservoir constitutes the only source of drinking water for the city of A Coruña and its metropolitan area (~400.000 inhabitants). The reservoir, which is two-tailed, is located downstream the Barcés and Mero rivers (~250 km2) and belongs to the so-called Galician-Coast River Basin district (16,372 km2). The increasing water demand for human consumption and industrial purposes challenges the supply capacity of the system and this is especially acute when, in hydric-stress situations, the availability of water becomes reduced and the water quality is adversely affected by a number of hypolimnetic processes (anoxia, increased metal concentration, etc.) or by episodic algal blooms. Between May 2010 and May 2012, within the context of the LIFE07 ENV/E/000826 Aqua Plann Project, an in-depth study was commissioned by the local water supply managers (EMALCSA). The study encompassed a bathymetry and colmatation characterization as well as a systematic physico-chemical survey via monthly sampling and measurement in selected stations a series of relevant limnological parameters. Surface and bottom reservoir water was sampled in seven representative locations of the system while three of them were used for depth profiling. In addition, five stations were considered for collecting the top layer of the sediments of the reservoir (~20 cm) in two surveys developed in the spring and summer of 2012. The parameters determined, complemented with meteorological information and discharge flows, included temperature, Secchi's depth transparency, PAR radiation, pH, electrical conductivity, redox, dissolved oxygen, turbidity, alkalinity, chlorophyll, phycocyanin, Na, K, Ca, Mg, F, Cl, SO4, NH4, NO3, NO2, PO4, DIC, DOC, particulated organic carbon, Fe, Mn, Al, As, Ba, Be, B, Cd, Co

  12. Aniversario XXX de la creación del Centro Provincial de Información de Las Tunas

    Directory of Open Access Journals (Sweden)

    Edenny Reina Castillo Montes de Oca

    2014-08-01

    Científicas y otros; han permitido avanzar sustancialmente en las esferas de la alfabetización informacional y edición de artículos científicos, por mencionar algunas; y ha repercutido en el desarrollo de las actividades fundamentales del Centro Provincial de Información de Ciencias Médicas de Las Tunas. Valiosos trabajadores que antecedieron a este proceso, contribuyeron con entusiasmo a que el sueño de INFOMED se cumpliera en el territorio tunero, entre ellos, los que se desempeñaron como directores del centro, que fueron: Dr. Idalberto Borges Cárdenas, Lic. Estela Pérez Castillo, Dr. José Manuel Martínez Camejo, Lic. Ernesto José Barcáz Hechavarría, Lic. Lidia Olano Verdecia, Lic. Yoel Romero González, Dr. Orlando Serrano Barreda y Lic. José Suárez Lezcano. ¡FELICIDADES COLEGAS!

  13. Fbtr fuel fabrication. The radiological safety aspects

    International Nuclear Information System (INIS)

    Mixed uranium plutonium carbide (MC) was used as a driver fuel for the first time in the world in Fast Breeder Test Reactor (Fbtr) at Kalpakkam, India which attained criticality in Oct-1985, Even though mixed carbide fuel has several advantages like high thermal conductivity and high fissile atom density etc., its fabrication is difficult due to its susceptibility to oxidation and hydrolysis and more number of process steps involved in the fuel fabrication flowsheet compare to Mixed Oxide fuel fabrication. The mixed (U, Pu)C in powder form is highly pyrophoric in nature, thereby needing a high purity inert cover gas (Argon or Nitrogen) with less than 25 ppm of O2 and H2O. It is necessary to monitor the glove box atmosphere continuously for oxygen and moisture content. Stringent control is also necessary for oxygen and nitrogen content in the fuel from performance point of view. The carbide fuel is fabricated with the carbon to metal (C/M) ratio greater than one (5-20% M2C3 content) to avoid metallic phase formation during irradiation. The Fast Breeder Test Reactor (Fbtr) fuel fabrication facility at BARC has two wings, the pellet production and process control wing. The pellet production wing consists of a train of interconnected glove boxes. The process control wing consists of necessary instruments installed inside glove boxes, for rapid physical and chemical analysis of the feed materials, process intermediates and the final product with respect to oxygen, nitrogen, carbon and uranium to plutonium ratio. During various operations, radiological safety of the working personnel is of prime importance. The radiological safety (internal and external radiation hazards) is taken care by design safety as well as continuous radiological safety surveillance. In order to control the external dose from plutonium and its associated isotopes, various operation related dose distribution are analyzed and necessary steps are taken to reduce external exposure. Dose impacts

  14. Griscelli Syndrome: A Case Report

    Directory of Open Access Journals (Sweden)

    Seyed Ebrahim MANSOURI NEJAD

    2014-12-01

    Full Text Available How to Cite This Article: Mansouri Nejad SE, Yazdan panah MJ, Tayyebi Meibodi N, Ashrafzadeh F, Akhondian J, BeiraghiToosi M, Eslamieh H. Griscelli Syndrome: A Case Report. Iran J Child Neurol. 2014 Autumn;8(4: 72-75.ObjectiveGriscelli syndrome (GS is a rare autosomal recessive immune deficiency disorder that presents with pigmentary dilution of the skin and hair, recurrent skin and pulmonary infections, neurologic problems, hypogammaglobulinemia, and variable cellular immunodeficiency. Three mutations have been described in different phenotypes of the disease. In most of cases, GS leads to death in the first decade of life. In this article, we report a one-year-old child with type 2 GS who suffers from pigmentation disorder and hypogammaglobulinemia.ReferencesKharkar V, Pande S, Mahajan S, Dwiwedi R, Khopkar U. Griscelli syndrome: a new phenotype with circumscribed pigment loss? Dermatol Online J 2007 1;13(2:17.Sheela SR, Latha M, Susy JI. Griscelli syndrome: Rab 27a mutation. Indian Pediatrics 2004; 41:944-947.González Carretero P, Noguera Julian A, Ricart Campos S, Fortuny Guasch C, Martorell Sampol L. Griscelli-Prunieras syndrome: report of two cases. An Pediatr (Barc 2009 ; 70(2:164-7.Szczawinska-Poplonyk A, Kycler Z, Breborowicz A, Klaudel-Dreszler M, Pac M, Zegadlo-Mylik M, et al. Pulmonary lymphomatoid granulomatosis in Griscelli syndrome type 2. Viral Immunol 2011 Dec;24(6:471-3.Durmaz A, Ozkinay F, Onay H, Tombuloglu M, Atay A, Gursel O, et al. Molecular analysis and clinical findings of Griscelli syndrome patients. J Pediatr Hematol Oncol 2012 Oct;34(7:541-4.Reddy RR, Babu BM, Venkateshwaramma B, Hymavathi Ch. Silvery hair syndrome in two cousins: Chediak-Higashi syndrome vs Griscelli syndrome, with rare associations. Int J Trichology 2011; 3(2:107-11.Sahana M, Sacchidanand S, Hiremagalore R, Asha G. Silvery grey hair: clue to diagnose immunodeficiency. Int J Trichology 2012;4(2:83-5.Mahalingashetti PB, Krishnappa MH, Kalyan PS

  15. 临近深基坑的高边坡稳定性动态监测及险情分析%Analysis of slip-risk and dynamic monitoring of a high building slope fringed a deep-founding pit

    Institute of Scientific and Technical Information of China (English)

    王启云; 谷淡平; 张家生; 熊智彪

    2011-01-01

    The paper intends to report our analysis of slip-risk and dynamic monitoring of a high building slop fringed a deep-founding pit. In our paper, we trial-used the combination of a single row of artificially-dug-up piles and pre-stressed anchor rope as the barcing system for the foundation pit in the complicated surroundings, with soil nail wall put on partial side. A slope was supposed to be built near the southern side of the pit supported with an anchor-plate retaining structure. In the process of excavation, monitoring was to be done to see if any horizontal displacement, deformation of deep soil took place with the axial load of anchor rope getting loose or any technical data and code dispatched from the demand. The pit-monitoring results we have found indicate that the pile-anchor system helps to control the deformation effectively, whereas the axial load of anchor rope was discovered fluctuating to increase or decrease in the process of excavation with the average change being about 11%. The slope monitoring results show that the axial load of the rope has somewhat enhanced due to the rainfall. In addition, the pre-stressed loss after being locked was found to exceed 10% because of intensive stretching of the adjoining ropes, the rotative boring of the anchor rope against the stabilization and deformation-increase of the unstable slope. In the process of excavation, the deformation in some parts was found too big and resulted in a dangerous state. While keeping tracing the dangerous state of the side of the foundation pit, we have depicting the deformation and the unstable part of the anchoring device with its axial loading in a close way. As a result of comprehensive analysis, design, construction and monitoring, we have concluded that dangerous situation took place for the reason that the overbreak, explosive excavation, rainfall and so on are all the factors contribute to the hazardous state. Seeing there exist all these problems, we have proposed

  16. Interim Report on Metallic Component Margins Under High Seismic Loads. Survey of Existing Practices and Status of Benchmark Work

    International Nuclear Information System (INIS)

    seismically designed components to be able to withstand beyond design basis earthquake. If the specific requirements for beyond design basis earthquake exists then design robustness of DBE components are not required. The second phase of MECOS work included a selection process for the experiments to use for the benchmarking calculations of the three candidate tests and test facilities. These three tests are described briefly in this report. The detailed documentation and recent vintage of the experimental programme by Indian BARC Institute was selected from amongst these three candidates as the benchmark for the MECOS calculations. The following preliminary conclusions can be made based on the work to date: a) All the experiments carried out around the world conclude unanimously that there are large margins in the design of piping systems. However, b) The failure mode addressed by the design criteria (plastic instability) is not the one observed in the experimental campaigns (fatigue-ratcheting). Preliminary conclusion of MECOS is that the Fukushima accident has not raised any new issues in seismic regulations and in design of components and structures. (authors)

  17. Passive Safety Systems in Advanced Water Cooled Reactors (AWCRS). Case Studies. A Report of the International Project on Innovative Nuclear Reactors and Fuel Cycles (INPRO)

    International Nuclear Information System (INIS)

    system, an integral test loop (ITL) was set up at Bhabha Atomic Research Centre (BARC) and the stability state of the ITL was investigated and experiments were conducted in ITL simulating the startup procedure for different powers and pressures. Major findings and conclusions of the AWCR case studies are the following: - All mechanical devices considered are able to suppress the instability in the loop and especially the spool piece with helical coil and bellow. It can be concluded that the helical coil is an effective tool to suppress instability in single-phase natural circulation systems. - The instabilities get suppressed in both single-phase and two-phase natural circulation systems in the presence of nanoparticles in the water. The increase in the loop flow rate in the presence of nanoparticles was found to be proportional to the concentration of nanoparticles. - A wide area in the stability map has been detected at condensation power values close to 0.75 MW in which the stability margins are considerably incremented. This region offers excellent conditions to guarantee the reactor stability for a wide range of operation conditions. - The use of fewer shrouds gives a higher flow rate and improved inventory utilization but multidimensional effects are not accounted for in RELAP5 code simulation. Therefore, further studies on the shroud effect based on integral simulation with isolation condenser system (ICS) and CFD simulation are required. - As per simple analyses using CFX code and the separate effect tests, a horizontal heat exchanger shows better performance regarding thermal stratification in large pools. The reason is that the horizontal heat exchanger provides a greater driving force for natural convection and hence higher circulation rates than a vertical heat exchanger

  18. A Study on Causes and Types of Abnormal Increase in Infants’ Head Circumference in Kashan/Iran

    Directory of Open Access Journals (Sweden)

    Ahmad TALEBIAN

    2013-08-01

    use of population-based parentoffspring data. American J Epidemiol 2007;165(7:734-41.2. Sankaran S, Das A, Bauer CR, Bada HS, Lester B, Wright LL, et al. Association between patterns of maternal substance use and infant birth weight, length and head circumference.Pediatrics 2004;114(2:e226-34.3. Demestre Guasch X, Raspall Torrent F, Vila Ceren C, Sala Castellvi P, Elizari Saco MJ, Martinez-Nadal S, et al. Influence of socioeconomic factors on weight, length and head circumference measurements in newborns from 35 to 42 weeks gestational. An Pediatr (Barc 2009;70(3:241-52.4. Fenichel, GM. Disorders of cranial volume and shape. In: Clinical Pediatric Neurology: A Signs and Symptoms Approach, 6th ed. Philadelphia: Elsevier Saunders; 2009.p. 368.5. Kinsman SL, , Johnston MV. Hydrocephalus. In: Kliegman RM, Stanton BF, St Geme JW, Schor NF, Behrman RE, editors. Nelson textbook of pediatrics. 19th ed. Philadelphia, PA: Elsevier/Saunders, Philadelphia; 2011. p. 2008-11.6. Nard, JA. Abnormal head size and shape. In: Gartner JC,Zitelli BJ, editors. Common and Chronic Symptoms in Pediatrics. St. Louis: Mosby; 1997.7. Menkes JH, Sarnat HB, Flores-Sarnat L. Malformations of the central nervous system. In: Menkes JH, Sarnat HB, Maria BL, editors. Child Neurology. 7th ed. Philadelphia:  Lippincott Williams & Wilkins; 2006. p. 284.8. Williams CA, Dagli A, Battaglia A. Genetic disorders associated with macrocephaly. Am J Med Genet A 2008;146A(15:2023-37.9. Varma R, Williams SD, Wessel HB. Neurology. In: Zitelli BJ, Davis HW, edtors. Atlas of Pediatric Physical Diagnosis. 5th ed. Philadelphia: Mosby Elsevier; 2007. p. 563.10. Rekate HL. Hydrocephalus in children. In: Winn HR, Youmans JR, editors. Youmans Neurological Surgery. 5th ed. St Louis: Saunders. 2003. 3387-404.11. Gupta SN, Belay B. Intracranial incidental findings on brain MR images in a pediatric neurology practice: a retrospective study. J Neurol Sci 2008;264(1-2:34-7.12. Alper G, Ekinci G, Yilmaz Y, Arikan C, Telyar G

  19. Clinic Characteristics of Varicella Zoster Myocarditis

    Institute of Scientific and Technical Information of China (English)

    FANG; Wu-wang

    2001-01-01

    [1]Kokstein Z, Balatka J, Horacek J. ECG changes in children with acute myocarditis[J]. Sb Ved Pr Lek Fak Karlovy Univerzity Hradci Kralove Suppl, 1990, 33(4): 373-379.[2]Rich R, McErlean M. Complete heart block in a child with varicella[J]. Am J Emerg M, 1993, 11(6): 602-605.[3]Sobrino MJM, Lopez PF, Cisneros JM, et al. Thoracic pain as early clinical manifestation of myocarditis caused by varicella [J]. Med Clin Barc,1992, 99(6): 236-237.[4]Teravanichpong S, Chuangsuwanich T. Fatal varicella in a healthy girl[J]. J Med Assoc Thai, 1990, 73(11): 648-651.[5]Amral FT, Bestetti RB, Araujo RC, et al. Transient atroventricular conduction disordor: a potential cause of sudden death in myocarditis due to varicella[J]. Arq Bras Cardiol, 1989, 53(2): 129-131.[6]Lorber A, Zonis Z, Maisuls E, et al. The scale of myocardial involvement in varicella myocarditis[J]. Int J Cardiol,1988, 20(2): 257-262.[7]Ettedgui JA, Ladusans E, Bamford M. Complete heart block as a complication of varicella[J]. Int J Cardiol, 1987, 14(3): 362-365.[8]Waagner DC, Murphy TV. Varicella myocarditis[J]. Pediatr Infect Dis J, 1990, 9(5): 360-363.[9]Rivera CF, Omar M, Aliaga ML, et al. Varicella complicated by pericarditis and pneumonia [J]. An Med Interna, 1996, 13(3): 130-132.[10]Civico RF, Omar M, Martinez LA, et al. Varicella complicated by pericarditis and pneumonia [J]. An Med Interna, 1996, 13(3): 130-132.[11]Bachli E, Kagi MK, Krause M. Visceral and neurological complications in varicella infections of adults [J]. Schweiz Med Wochenschr, 1996, 126(11): 440-446.[12]Senellart F, Bozio A, Sassolas F, et al. Varicella myocarditis and junctional ectopic tachycardia [J]. Pediatrie Bucur, 1991, 46(3): 267-270.[13]Straus S, Ostrove J, Inchauspe G, et al. Varicella- zoster virus infections[J]. Ann Intern Med,1988, 108: 221-237.[14]Tsintsof A, Delprado WJ, Keogh AM. Varicella zoster myocarditis progressing to cardiomyopathy and cardiac

  20. Indigenous surgical gamma probe: Performance evaluation in the detection of sentinel node in breast cancer: A preliminary report

    International Nuclear Information System (INIS)

    Full text: Knowledge about the physical characteristics of the surgical gamma probe is essential for probe selection. In fact the relevant physical parameters should be deduced from the practical clinical requirements. The requirements are that all radioactive nodes should be detected and separated with reasonable precision especially those with low tracer uptake and those, which are deep-seated close to the injection site in the peritumoral area. This can be determined by the combination of angular resolution, collimation and shielding of the probe. The probe should be easily manoeuvrable in the small operative field and preferably have an audio signal. There have been quite a few reports in literature assessing the performance of the commercially available systems and it has been unanimously reported that various commercial gamma probe systems have strikingly different performance. These probes are also expensive to procure. Keeping these is mind and discussing our clinical requirements with the scientists of Isotope application division, Isotope group of Bhabha Atomic Research Centre (BARC) Mumbai, India, a basic surgical gamma probe was designed indigenously. This system is a microcomputer based gamma counting system that displays the number of pulse detected by the probe in counts per second and has an audible signal in direct correlation with the count density. The detector probe has an integral assembly of NaI (Tl) 10 mm x 20 mm. It has a size of 19 mm x 180 mm and weighs 0.23 kgs equipped with parallel hole lead collimator and has to be manually adjusted for 99mTc. The physical parameters are a high sensitivity of 5000 cps/MBq at probe tip with a good spatial resolution and FWHM <20mm measured at 1 cm distance. It is claimed that two sources separated by distance of 25mm can be easily distinguished The performance of this probe was evaluated to detect sentinel node in early breast cancer. 7 patients of early breast cancer (T1-2 N0M0) underwent

  1. Plant Breeding and Genetics Newsletter, No. 25, July 2010

    International Nuclear Information System (INIS)

    Training Course on Mutation Induction and Breeding for Cereal - Wheat and Barley - Rust Resistance and Climate Hardening/Harsh Environment Adaptation Parts I and II see 'Forthcoming Events' in this issue). Regular yearly meetings are essential for harmonizing cooperation between participating Member States, the IAEA, FAO and its partners, CYMMYT (Kenya), ARS, BGRI, CAAS, BARC, ICARDA, DAFWA and the Secretariat of International Treaty on Plant Genetic Resources for Food and Agriculture (FAO, Italy), (iii) multilocation trials of mutant germplasm in endemic hot spots/screen houses. These phases are not necessarily consecutive, but overlapping. If you navigate to our Homepage (http://wwwnaweb. iaea.org/nafa/pbg/index.html) you will find under 'Information Sources' our upgraded and updated Mutant Varieties and Genetic Stock Webpage (http://mvgs.iaea.org/). Have a look at the new features and do not forget to submit any new mutant variety (registration may be on-line). One of the new features, although still under construction, may be useful to you: our in-house protocols, Protocols and Guidelines Webpage (http://mvgs.iaea.org/LaboratoryProtocals.aspx). Here you will find detailed protocols developed/adapted and tested at the IAEA's Laboratories. You will also find information, forms and protocols for genotyping and mutagenesis services and positive control kits for mutation discovery

  2. CSWS Versus SIADH as the Probable Causes of Hyponatremia in Children With Acute CNS Disorders

    Directory of Open Access Journals (Sweden)

    Hadi SORKHI

    2013-08-01

    : syndrome of inappropriate antidiuretic hormone secretion versus cerebral salt wasting. Nephrol Dial Transplant 2000;15(2:262-8.14. Rivkees SA. Differentiation appropriate antiduretic hormone secretion, inappropriate antiduretic secretion and cerebral salt wasting: the common, uncommon, and misnamed. Curr Opin Pediatr 2008;20(4:448-52.15. Sterns RH, Silver SM. Cerebral salt wasting versus SIADH:What difference? J Am Soc Nephrol 2008;19(2:194-6.16. Jiménez R, Casado-Flores J, Nieto M, García-Teresa MA. Cerebral salt wasting syndrome in children with acute central nervous system injury. Pediatr Neurol 2006;35(4:261-3.17. Bartter FC, Schwartz WB. Syndrome of inappropriate secretion of antidiuretic hormone. Am J Med 1967;42:790- 806.18. Verbalis JG. Pathogenesis of hyponatremia in an experimental model of the syndrome of inappropriate antidiuresis. Am J Physiol 1994;267(6 Pt 2:R1617-25.19. Harrigan MR. Cerebral salt wasting syndrome: a review.Neurosurgery 1996;38(1:152-60.20. Inatomi J, Yokoyama Y, Sekine T, Igarashi T. A case of cerebral salt-wasting syndrome associated with aseptic meningitis in an 8-year-old boy. Pediatr Nephrol 2008;23(4:659-62.21. Brookes MJ, Gould TH. Cerebral salt wasting syndrome in meningoencephalitis: a case report. J Neurol Neurosurg Psychiatry 2003;74(2:277.22. Cuardrado-Godia E, Cerda M, Rodriguez-Campello A, Puig de Dou J. Sindrome pierde sal cerebral en las infeccioned del sistema nervioso central. Med Clin (Barc 2007;24:128(7;229-9.23. Roca-Ribas F, Ninno JE, Gasperin A, Lucas M, Liubia C. Cerebral salt wasting syndrome as a postoperative complication after surgical resection of acoustic neuroma. Otol Neurotol 2002;23:992-5.24. Bussmann C, Bast T, Rating D. Hyponatraemia in childrenwith acute CNS disease: SIADH or cerebral salt wasting? Childs Nerv Syst 2001;17(1-2:58-62.25. Hardesty DA, Kilbaugh TJ, Storm PB. Cerebral Salt Wasting Syndrome in Post-Operative Pediatric Brain Tumor Patients. Neurocrit Care 2012;17(3:382-7.26. Agha A, Thornton E