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Sample records for arst anu reinart

  1. Study on bioactive compounds from Streptomyces sp. ANU 6277.

    PubMed

    Narayana, Kolla J P; Prabhakar, Peddikotla; Vijayalakshmi, Muvva; Venkateswarlu, Yenamandra; Krishna, Palakodety S J

    2008-01-01

    An attempt was made to study the bioactive compounds from a terrestrial Streptomyces sp. ANU 6277 isolated from laterite soil. Four active fractions were recovered from the solvent extracts obtained from the culture broth of five day-old strain. Three bioactive compounds were purified and identified as 3-phenylpropionic acid, anthracene-9,10-quinone and 8-hydroxyquinoline. The components of the partially purified fourth active fraction were analyzed by gas chromatography-mass spectrometry and identified as benzyl alcohol, phenylethyl alcohol and 2H-1, 4-benzoxazin-3 (4H)-one. Four active fractions were screened for antimicrobial activity against Gram-positive and Gram-negative bacteria, and fungi including phytopathogenic, toxigenic and dermatophytic genera. Among these metabolites, 8-hydroxyquinoline exhibited strong antibacterial and antifungal activity as compared to 3-phenylpropionic acid and anthracene-9,10-quinone.

  2. An integrated computer control system for the ANU linac

    NASA Astrophysics Data System (ADS)

    Davidson, P. M.; Foote, G. S.

    1996-02-01

    One facet of the installation of the superconducting linac at the ANU is the need for computer control of a variety of systems, such as beam transport, resonator RF, cryogenics and others. To accommodate this, a number of control interfaces (for example, analogue signals and RS232 serial lines) must be employed. Ideally, all of the systems should be able to be controlled from a central location, remote from the actual devices. To this end a system based around VAX computers and VME crates has been designed and is currently being developed and implemented. A VAXstation is used to issue control messages and perform high-level functions, while VME crates containing appropriate modules (primarily DACs, ADCs and digital I/O boards) control the devices. The controllers in the VME crates are AEON rtVAX modules running a real-time operating system. Communication with the VAXstation is via DECnet, on a private ethernet to allow communication rates unaffected by unrelated network activity and potentially increasing the security of the system by providing a possible network isolation point. Also on this ethernet are a number of terminal servers to control RS232 devices. A central database contains all device control and monitoring parameters. The main control process running on the VAXstation is responsible for maintaining the current values of the parameters in the database and for dispatching control messages to the appropriate VME crate or RS232 serial line. Separate graphical interface processes allow the operator to interact with the control process, communicating through shared memory. Many graphics processes can be active simultaneously, displaying either on a single or on multiple terminals. Software running on the rtVAX controllers handles the low-level device-specific control by translating messages from the main control process to VME commands which set hardware outputs on VME modules. Similarly, requests for the value of a parameter result in the rtVAX program

  3. A Personal Memoir of Policy Failure: The Failed Merger of ANU and the Canberra CAE

    ERIC Educational Resources Information Center

    Scott, Roger

    2004-01-01

    The more immediate context of the events the author describes in this article is needed in order to identify the policy framework within which the Australian National University (ANU)-Canberra CAE (CCAE) merger was placed as a component of a wider public policy initiative undertaken by John Dawkins. There were four major components in that wider…

  4. Decay spectroscopy with Solenogam at the ANU Heavy Ion Accelerator Facility

    NASA Astrophysics Data System (ADS)

    Gerathy, M. S. M.; Reed, M. W.; Lane, G. J.; Kibédi, T.; Hota, S. S.; Stuchbery, A. E.

    2016-09-01

    Solenogam is a recoil spectrometer designed and constructed for use at the Australian National University (ANU) Heavy-Ion Accelerator Facility (HIAF). The design enables the study of nuclear excitations populated by the decay of long-lived states such as isomers and radioactive ground states. Solenogam is comprised of high-sensitivity γ-ray and electron detector arrays coupled to a new 8-T solenoid. While the installation of the 8-T solenoid proceeds, off-line measurements have been made to characterise Solenogam's performance. Gamma-electron coincidences in the electron capture decay of 182Re into 182W were used to investigate conversion coeffcients and γ-e- angular correlations. The measured conversion coeffcients show good agreement with theoretical calculations and have been used to extract E0/E2 mixing ratios for a number of J → J transitions. The angular correlations measured by the array are in qualitative agreement with theoretical calculations. However, the magnitudes of the correlations are attenuated by approximately 40% for reasons unknown at present. These results are the first full use of the Solenogam system for γ-e- coincidence measurements and have proven that the system is capable of highly-sensitive internal conversion analysis of complex decays.

  5. Structural analysis of the genes encoding the molybdenum-iron protein of nitrogenase in the Parasponia rhizobium strain ANU289.

    PubMed Central

    Weinman, J J; Fellows, F F; Gresshoff, P M; Shine, J; Scott, K F

    1984-01-01

    The genes encoding the Molybdenum-Iron protein component of nitrogenase (nifD and nifK) have been identified and fully characterised in the Parasponia Rhizobium strain ANU289. The two genes are contiguous and are separated from the gene encoding the Fe-protein component of nitrogenase (nifH) by 21 kb of DNA. We present the entire DNA sequence of the nifD and nifK genes, thus completing the characterisation of the primary structure of the nitrogenase genes in this Rhizobium strain. Comparison of the sequence preceding the transcription initiation point of nifDK with that preceding nifH reveals a consensus promoter sequence 5'-PyTGGCAPyG-4 bp-TTGC(T/A)-10 bp-3'. This consensus promoter is found preceding nif genes in both fast-growing and slow-growing Rhizobium strains and shows a structural similarity to that preceding the coordinately-regulated nif operons in the asymbiotic organism Klebsiella pneumoniae. Images PMID:6095197

  6. Online Bibliographic Retrieval Services in Various Australian Tertiary Institutions: Trends in the Scope and Nature of Online Searching and an Evaluation of Patron Satisfaction. ANU Library Occasional Paper Number 2.

    ERIC Educational Resources Information Center

    Wood, Fiona

    A 1981 investigation by the Australian National University (ANU) library of the scope and nature of online bibliographic retrieval services provided by the 19 Australian university libraries and 5 of the Australian central Institute of Technology libraries, and a further study carried out in 1980-81 to assess the satisfaction of patrons with…

  7. Down-regulation of a chitin synthase a gene by RNA interference enhances pathogenicity of Beauveria bassiana ANU1 against Spodoptera exigua (HÜBNER).

    PubMed

    Lee, Jung-Bok; Kim, Hyun Soo; Park, Youngjin

    2017-02-01

    Chitin synthase (CHS) is an important enzymatic component, which is required for chitin formation in the cuticles and cuticular linings of other tissues in insects. CHSs have been divided into two classes, classes A and B, based on their amino acid sequence similarities and functions. Class A CHS (CHS-A) is specifically expressed in the epidermis and related ectodermal cells such as tracheal cells, while class B CHS (CHS-B) is expressed in gut epithelial cells that produce peritrophic matrices. In this study, we cloned the CHS-A gene from the beet armyworm, Spodoptera exigua (SeCHS-A). The SeCHS-A contains an open reading frame of 4,698 nucleotides, encoding a protein of 1,565 amino acids with a predicted molecular mass of approximately 177.8 kDa. The SeCHS-A mRNA was expressed in all developmental stages and specifically in the epidermis and tracheae tissue by quantitative real-time-PCR analysis. Expression of SeCHS-A gene was suppressed by feeding double-stranded RNA (dsCHS-A, 400 ng/larva) in the third instar larvae of S. exigua. Suppression of the SeCHS-A gene expression significantly increased 35% of mortality on pupation of S. exigua. Also, the third instar larvae fed with dsCHS-A significantly increased susceptibility to entomopathogenic fungi, Beauveria bassiana ANU1 at 3 days after treatment. These results suggest that the SeCHS-A gene plays an important role in development of S. exigua and RNA interference may apply to effective pest control with B. bassiana.

  8. Assessment of altered binding specificity of bacteriophage for ciprofloxacin-induced antibiotic-resistant Salmonella Typhimurium.

    PubMed

    Kim, Jeongjin; Jo, Ara; Ding, Tian; Lee, Hyeon-Yong; Ahn, Juhee

    2016-08-01

    This study describes a new effort toward understanding the interaction mechanisms between antibiotic-resistant Salmonella Typhimurium and phages. The antibiotic susceptibility, β-lactamase activity, bacterial motility, gene expression, and lytic activity were evaluated in ciprofloxacin-induced antibiotic-sensitive Salmonella Typhimurium (ASST(CIP)) and ciprofloxacin-induced antibiotic-resistant S. Typhimurium (ARST(CIP)), which were compared to the wild-type strains (ASST(WT) and ARST(WT)). The MIC values of ampicillin, norfloxacin, chloramphenicol, and tetracycline were significantly increased to > 512, 16, 16, and 256 μg/ml, respectively, in the ARST(CIP). The lowest and highest extracellular lactamase activities were observed in ASST(WT) (6.85 μmol/min/ml) and ARST(CIP) (48.83 μmol/min/ml), respectively. The acrA, lpfE, and hilA genes were significantly upregulated by more than tenfold in both ASST(CIP) and ARST(CIP). The induction of multiple antibiotic resistance resulted from the increased efflux pump activity (AcrAB-TolC). The highest phage adsorption rates were more than 95 % for ASST(WT), ASST(CIP), and ARST(WT), while the lowest adsorption rate was 52 % for ARST(CIP) at 15 min of infection. The least lytic activity of phage was 20 % against the ARST(CIP), followed by ASST(CIP) (30 %). The adsorption rate of phage against ARST(CIP) was 52 % at 15 min of infection, which resulted in the decrease in lytic activity (12 %). Understanding the interaction of phage and bacteria is essential for the practical application of phage to control and detect antibiotic-resistant bacteria. The results provide useful information for understanding the binding specificity of phages for multiple antibiotic-resistant pathogens.

  9. Automatic Radiated Susceptibility Test System for Payload Equipment

    NASA Technical Reports Server (NTRS)

    Ngo, Hoai T.; Sturman, John C.; Sargent, Noel B.

    1995-01-01

    An automatic radiated susceptibility test system (ARSTS) was developed for NASA Lewis Research Center's Electro-magnetic Interference laboratory. According to MSFC-SPEC 521B, any electrical or electronic equipment that will be transported by the spacelab and space shuttle must be tested for susceptibility to electromagnetic interference. This state-of-the-art automatic test system performs necessary calculations; analyzes, processes, and records a great quantity of measured data; and monitors the equipment being tested in real-time and with minimal user intervention. ARSTS reduces costly test time, increases test accuracy, and provides reliable test results.

  10. Australian National University Science Extension Day

    ERIC Educational Resources Information Center

    Fletcher, Sarah

    2016-01-01

    The first Australian National University (ANU) Science Extension Day was held on September 8, 2015. The ANU Science Extension Day is a project that was initiated by Theodore Primary School (ACT) and developed by Theodore Primary, Calwell High School, Science Educators Association of the ACT (SEA*ACT), and the ANU. The project was developed with a…

  11. The ANU WellBeing study: a protocol for a quasi-factorial randomised controlled trial of the effectiveness of an Internet support group and an automated Internet intervention for depression

    PubMed Central

    2010-01-01

    Background Recent projections suggest that by the year 2030 depression will be the primary cause of disease burden among developed countries. Delivery of accessible consumer-focused evidenced-based services may be an important element in reducing this burden. Many consumers report a preference for self-help modes of delivery. The Internet offers a promising modality for delivering such services and there is now evidence that automated professionally developed self-help psychological interventions can be effective. By contrast, despite their popularity, there is little evidence as to the effectiveness of Internet support groups which provide peer-to-peer mutual support. Methods/Design Members of the community with elevated psychological distress were randomised to receive one of the following: (1) Internet Support Group (ISG) intervention, (2) a multi-module automated psychoeducational and skills Internet Training Program (ITP), (3) a combination of the ISG and ITP, or (4) an Internet Attention Control website (IAC) comprising health and wellbeing information and question and answer modules. Each intervention was 12 weeks long. Assessments were conducted at baseline, post-intervention, 6 and 12 months to examine depressive symptoms, social support, self-esteem, quality of life, depression literacy, stigma and help-seeking for depression. Participants were recruited through a screening postal survey sent to 70,000 Australians aged 18 to 65 years randomly selected from four rural and four metropolitan regions in Australia. Discussion To our knowledge this study is the first randomised controlled trial of the effectiveness of a depression ISG. Trial registration Current Controlled Trials ISRCTN65657330. PMID:20211025

  12. Energy Consumption of Battery-Operated Screwdriver at Assembling Fixed Threaded Joints / Akumulatora Skrūvgrieža Elektroenerģijas Patēriņa Aprēķins, Veicot Nekustīga Vītņu Savienojuma Salikšanu Atkarībā No Operatora Reakcijas Laika

    NASA Astrophysics Data System (ADS)

    Grinevich, I.; Mozga, N.; Rudzitis, J.

    2013-10-01

    The electrical energy consumption of battery-operated screwdrivers, which are widely used in many industries, e.g. automotive, heavy, chemical, etc., can be considerably reduced. This would allow increasing the service life of a battery and reducing the time of its charging, thus increasing the productivity and decreasing the prime cost of this battery. It is shown that up to 17.9% of electrical energy could be saved at assembling fixed threaded joints by removing power from the screwdriver immediately after reaching the required tightening torque. Dotajā rakstā uzmanība tiek pievērsta akumulatora skrūvgrieža elektroenerģijas patēriņa samazināšanas iespējām sakarā ar problēmas aktualitāti šīs grupas plaši pielietotajiem instrumentiem. Elektroenerģijas patēriņa samazināšana masveida ražošanā, kur tiek izmantoti akumulatora skrūvgrieži, ļautu paildzināt akumulatora baterijas kalpošanas mūžu un samazināt uzlādēšanas laiku, kas, savukārt, novestu pie ražības palielināšanas un produkcijas pašizmaksas samazināšanas.

  13. Positive everyday experiences interact with social support to predict depression in multiple sclerosis.

    PubMed

    Vargas, Gray A; Arnett, Peter A

    2010-11-01

    Both social support and stress predict depression in multiple sclerosis (MS) patients. Little work has been done on the relationship between positive life experiences and depression in this group. Ninety MS patients completed the Social Support Questionnaire (SSQ), the Hassles and Uplifts Scale (HUS), the Chicago Multiscale Depression Inventory (CMDI), and the Affective Reading Span Task (ARST). The Expanded Disability Status Scale (EDSS) was also used. Separate regression analyses were conducted with the EDSS entered at step 1, ARST memory bias score at step 2, SSQ at step 3, either Hassles or Uplifts at step 4, and the interaction term at step 5 to predict depression. Uplifts interacted significantly with social support to predict depression, but hassles did not. After considering disability level, memory bias, and social support and uplifts main effects, the interaction of uplifts and social support accounted for nearly 5% independent variance in depression (p < .05). These results suggest that the absence of uplifts, combined with low levels of social support, is related to depression in MS patients. More generally, these data indicate that it is important to study the absence of positive experiences along with stress and negative experiences in this population.

  14. Accelerator mass spectrometry at the Australian National University's 14UD accelerator: experience and developments

    NASA Astrophysics Data System (ADS)

    Fifield, L. K.; Ophel, T. R.; Allan, G. L.; Bird, J. R.; Davie, R. F.

    1990-12-01

    Although the major emphasis of the joint ANU/ANSTO accelerator mass spectrometry program has been the measurement of 36Cl samples, both 14C and 10Be capabilities have been implemented recently on the 14UD accelerator. The new developments and operating experience are reviewed.

  15. Classification of PSN J03442399-4440081 as a Type Ib SN with WiFeS

    NASA Astrophysics Data System (ADS)

    Childress, M.; Zhou, G.; Scalzo, R.; Yuan, F.; Schmidt, B.; Tucker, B.

    2014-06-01

    We report spectroscopic classification of PSN J03442399-4440081 with the Wide Field Spectrograph (WiFeS - Dopita et al., 2007, ApSS, 310, 255) on the ANU 2.3m telescope at Siding Spring Observatory, NSW Australia, using the B3000/R3000 gratings (3500-9800 A, 1 A resolution). ...

  16. Classification of PSN J08193798-2234147 as a Type Ib supernova with WiFeS

    NASA Astrophysics Data System (ADS)

    Childress, M.; Scalzo, R.; Yuan, F.; Zhang, B.; Ruiter, A.; Seitenzahl, I.; Schmidt, B.; Tucker, B.

    2014-10-01

    We report spectroscopic classification of PSN J08193798-2234147 with the Wide Field Spectrograph (WiFeS - Dopita et al., 2007, ApSS, 310, 255) on the ANU 2.3m telescope at Siding Spring Observatory, NSW Australia, using the B3000/R3000 gratings (3500-9800 A, 1 A resolution).

  17. Teaching and Learning Spaces; Refurbishment of the W. K. Hancock Science Library at the Australian National University 2011

    ERIC Educational Resources Information Center

    McNamara, Paul

    2012-01-01

    Two floors of the W. K. Hancock Library at the Australian National University (ANU) were refurbished in 2011 as part of a cooperative project between the library and the College of Science. The refurbishment, costing $5 million, was part of a much larger exercise involving the construction of four new science buildings around the Hancock Library.…

  18. Issues in Funding and Supporting Projects To Improve Quality and Encourage Innovation in Teaching in Departments.

    ERIC Educational Resources Information Center

    Pearson, Margot

    This paper discusses recent efforts to use grants to fund projects to improve quality and encourage innovation in teaching in Australian universities, with a particular focus on the experiences of the Australian National University (ANU) at Canberra. Several projects are described, including a program to improve coordination of first-year units; a…

  19. Hall devices improve electric motor efficiency

    NASA Technical Reports Server (NTRS)

    Haeussermann, W.

    1979-01-01

    Efficiency of electric motors and generators is reduced by radial magnetic forces created by symmetric fields within device. Forces are sensed and counteracted by Hall devices on excitation or control windings. Hall generators directly measure and provide compensating control of anu asymmetry, eliminating additional measurements needed for calibration feedback control loop.

  20. Early Formulation of Training Programs for Cost Effectiveness Analysis

    DTIC Science & Technology

    1978-07-01

    not necessary for him to break task information into linguistic components. However, if such a model were to be entirely automated in the future, a...ACADEMIC LIBRARY IUSA wAR COLLEGE ATTN: LItlRARY I UISA eNGINLER StilODL LIBARY ANu LLAR󈧭NG RESOLORCES CENTER I USA A.RMOR SCHOOL (USARMS) ATTIN

  1. An Eight-Alternative Concurrent Schedule: Foraging in a Radial Maze

    DTIC Science & Technology

    1994-05-01

    2-69) ANNME C ft .,aii or ANU sit Z•9.u 14 Best Available Copy JOURNAL OF THE EXPERIMENTAL ANALYSIS OF BEHAVIOR 1994, 61, 331 -t4M NUMBER 3(MAY) AIN...NJ: Earlbaum. Dukich, T. D., & Lee, A. E. (1973). A comparison of measures of responding under fixed-interval schedules. Journal of the Experimental Analysis of Behavior . 20

  2. Ubiquitin ligase MARCH 8 cooperates with CD83 to control surface MHC II expression in thymic epithelium and CD4 T cell selection.

    PubMed

    Liu, Haiyin; Jain, Reema; Guan, Jing; Vuong, Vivian; Ishido, Satoshi; La Gruta, Nicole L; Gray, Daniel H; Villadangos, Jose A; Mintern, Justine D

    2016-08-22

    Major histocompatibility complex class II (MHC II) expression is tightly regulated, being subjected to cell type-specific mechanisms that closely control its levels at the cell surface. Ubiquitination by the E3 ubiquitin ligase MARCH 1 regulates MHC II expression in dendritic cells and B cells. In this study, we demonstrate that the related ligase MARCH 8 is responsible for regulating surface MHC II in thymic epithelial cells (TECs). March8(-/-) mice have elevated MHC II at the surface of cortical TECs and autoimmune regulator (AIRE)(-) medullary TECs (mTECs), but not AIRE(+) mTECs. Despite this, thymic and splenic CD4(+) T cell numbers and repertoires remained unaltered in March8(-/-) mice. Notably, the ubiquitination of MHC II by MARCH 8 is controlled by CD83. Mice expressing a mutated form of CD83 (Cd83(anu/anu) mice) have impaired CD4(+) T cell selection, but deleting March8 in Cd83(anu/anu) mice restored CD4(+) T cell selection to normal levels. Therefore, orchestrated regulation of MHC II surface expression in TECs by MARCH 8 and CD83 plays a major role in CD4(+) T cell selection. Our results also highlight the specialized use of ubiquitinating machinery in distinct antigen-presenting cell types, with important functional consequences and implications for therapeutic manipulation.

  3. Leading Change: Applying Change Management Approaches to Engage Students in Blended Learning

    ERIC Educational Resources Information Center

    Quinn, Diana; Amer, Yousef; Lonie, Anne; Blackmore, Kim; Thompson, Lauren; Pettigrove, Malcolm

    2012-01-01

    The Australian National University (ANU) and the University of South Australia (UniSA) have embarked on Federally-funded project to collaborate in the design, development and delivery of a range of undergraduate and postgraduate courses in engineering. The collaboration investigates new ways to bring together the strengths and discipline expertise…

  4. Ubiquitin ligase MARCH 8 cooperates with CD83 to control surface MHC II expression in thymic epithelium and CD4 T cell selection

    PubMed Central

    Guan, Jing; La Gruta, Nicole L.; Gray, Daniel H.

    2016-01-01

    Major histocompatibility complex class II (MHC II) expression is tightly regulated, being subjected to cell type–specific mechanisms that closely control its levels at the cell surface. Ubiquitination by the E3 ubiquitin ligase MARCH 1 regulates MHC II expression in dendritic cells and B cells. In this study, we demonstrate that the related ligase MARCH 8 is responsible for regulating surface MHC II in thymic epithelial cells (TECs). March8−/− mice have elevated MHC II at the surface of cortical TECs and autoimmune regulator (AIRE)− medullary TECs (mTECs), but not AIRE+ mTECs. Despite this, thymic and splenic CD4+ T cell numbers and repertoires remained unaltered in March8−/− mice. Notably, the ubiquitination of MHC II by MARCH 8 is controlled by CD83. Mice expressing a mutated form of CD83 (Cd83anu/anu mice) have impaired CD4+ T cell selection, but deleting March8 in Cd83anu/anu mice restored CD4+ T cell selection to normal levels. Therefore, orchestrated regulation of MHC II surface expression in TECs by MARCH 8 and CD83 plays a major role in CD4+ T cell selection. Our results also highlight the specialized use of ubiquitinating machinery in distinct antigen-presenting cell types, with important functional consequences and implications for therapeutic manipulation. PMID:27503069

  5. Protection against methoxyacetic-acid-induced spermatocyte apoptosis with calcium channel blockers in cultured rat seminiferous tubules: possible mechanisms.

    PubMed

    Li, L H; Wine, R N; Miller, D S; Reece, J M; Smith, M; Chapin, R E

    1997-05-01

    A calcium-mediated mechanism underlying spermatocyte apoptosis induced by 2-methoxyethanol (2-ME) has been previously proposed. This hypothesis was tested in vitro in the present study using cultured juvenile (25 days old) and adult rat seminiferous tubules (JRST and ARST, respectively) with methoxyacetic acid (MAA, the active metabolite of 2-ME). In JRST, spermatocyte degeneration was morphologically obvious 19 hr after a 5-hr exposure to 5 mM MAA. The lesion was unaffected by the presence or absence of extratubular Ca2+. However, MAA-induced cell death was significantly prevented by cotreatment with the dihydropyridines (DHP) nifedipine (50 microM) and nicardipine (20 microM), as well as verapamil (50 microM) and TMB-8 (50 microM), all of which are able to inhibit calcium movement through plasma membranes. However, neither ryanodine, dantrolene, nor cyclosporin A and ruthenium red, which inhibit Ca2+ mobilization from intracellular stores (endoplasmic reticulum and mitochondria), affected the MAA-induced cell death. Inhibition of calcium mobilization through IP3-sensitive pathways by blocking the product of IP3 with manoalide, neomycin, and U73122 did not block the MAA-induced lesion. The protective effects of 50 microM nifedipine and 50 microM TMB-8 were also observed in ARSTs treated with 10 mM MAA for 5 hr. However, when rat testicular sections were immunohistochemically stained with monoclonal antibodies specific for the alpha 1 (the DHP receptor) or the alpha 2 subunits of DHP-sensitive calcium channels, no positive staining was found. Finally, in an attempt to see whether the intracellular free calcium concentrations ([Ca2+]i) in germ cells were increased after the MAA treatment, intact seminiferous tubules were loaded with indo-1 and were measured using laser-scanning confocal microscopy. No detectable increase in the signal in MA A-sensitive spermatocytes was observed, while a 34-54% increase in the signal could be detected in the same cell types when

  6. Inter-comparison in 10Be analysis starting from pre-purified quartz

    NASA Astrophysics Data System (ADS)

    Schnabel, C.; Reinhardt, L.; Barrows, T. T.; Bishop, P.; Davidson, A.; Fifield, L. K.; Freeman, S.; Kim, J. Y.; Maden, C.; Xu, S.

    2007-06-01

    The results of the first international inter-comparison of 10Be analysis from quartz are presented. This inter-comparison includes the sample preparation starting from pre-purified quartz and AMS measurements at SUERC and ANU. Measured 10Be concentrations agree within their uncertainties for six out of seven samples with 10Be concentrations greater than 1 × 104 at/g quartz. This agreement and also the agreement of 10Be concentrations analysed from two aliquots of the same sample at SUERC indicate that addition of 9Be carrier before (used at ANU) or after quartz dissolution (used at SUERC apart from one aliquot of one sample) should not result in substantially different results.

  7. Two years since SSAMS: Status of 14C AMS at CAIS

    NASA Astrophysics Data System (ADS)

    Ravi Prasad, G. V.; Cherkinsky, Alexander; Culp, Randy A.; Dvoracek, Doug K.

    2015-10-01

    The NEC 250 kV single stage AMS accelerator (SSAMS) was installed two years ago at the Center for Applied Isotope Studies (CAIS), University of Georgia. The accelerator is primarily being used for radiocarbon measurements to test the authenticity of natural and bio-based samples while all other samples such as geological, atmospheric, marine and archaeological. are run on the 500 kV, NEC 1.5SDH-1 model tandem accelerator, which has been operating since 2001. The data obtained over a six months period for OXI, OXII, ANU sucrose and FIRI-D are discussed. The mean value of ANU sucrose observed to be slightly lower than the consensus value. The processed blanks on SSAMS produce lower apparent age compared to the tandem accelerator as expected.

  8. Laboratory Plasma Studies

    DTIC Science & Technology

    1989-05-23

    advantage of the NCAR Autograph plotting package anU the improvements in character manipulation developed by Horace Mitchell of SAIC. Using this combination...standardize output from the various beam simulation models. It was also necessary to reprogram the post-processors themselves to take full advantage of the...years’that take advantage of the substantially higher currents and voltages available for short pulses (typically, -5100 nsec) from high voltage pulseline

  9. Total Quality Management: Implications for Nursing Information Systems

    DTIC Science & Technology

    1992-01-01

    I Spring 1992 I THESIStI FUNNME 14. TILt ANU 5UO,,IL 5 . FUNDING NUMBERS / Total Quality Management: Implications for Nursing Information Systems 6...References ....... .................... ii Total Quality Management 5 Abstract Total quality management (TQM) is a management philosophy gaining...Berwick et al., 1991). Actual definitions of this quality management approach differ along with the numerous "gurus" who have written extensively on

  10. Numerical Treatment of Differential and Integral Equations by the P and H-P Versions of the Finite Element Method

    DTIC Science & Technology

    1992-01-01

    mathematical papers which describe various locking effects and analyze methods (mainly mixed methods ) to overcome it. However, the treatment in these...finite element method in various areas, such as the numerical approximation of three-dimensional PDEs anu integral equations, the investigation of mixed ... methods for these versions and, most importantly, the uniform approximation of parameter-dependent problems by these versions. By the p version, we

  11. A Biomimetic Algorithm for Flight Stabilization in Airborne Vehicles, Based on Dragonfly Ocellar Vision

    DTIC Science & Technology

    2006-07-27

    Australia Email: gert.stange@anu.edu.au A biomimetic algorithm for flight stabilization in airborne vehicles, based on dragonfly ocellar vision...27 JUL 2006 2. REPORT TYPE Final Report (Technical) 3. DATES COVERED 10-06-2005 to 01-03-2006 4. TITLE AND SUBTITLE A Biomimetic Algorithm for...anatomy of the dragonfly occeli, it can be concluded that they are simple lens eyes designed for attitude stabilization. 15. SUBJECT TERMS Biomimetics

  12. Genome Sequence of Bradyrhizobium pachyrhizi Strain PAC48T, a Nitrogen-Fixing Symbiont of Pachyrhizus erosus (L.) Urb.

    PubMed

    Delamuta, Jakeline Renata Marçon; Ribeiro, Renan Augusto; Gomes, Douglas Fabiano; Souza, Renata Carolina; Chueire, Ligia Maria Oliveira; Hungria, Mariangela

    2015-09-17

    Bradyrhizobium pachyrhizi PAC48(T) has been isolated from a jicama nodule in Costa Rica. The draft genome indicates high similarity with that of Bradyrhizobium elkanii. Several coding sequences (CDSs) of the stress response might help in survival in the tropics. PAC48(T) carries nodD1 and nodK, similar to Bradyrhizobium (Parasponia) ANU 289 and a particular nodD2 gene.

  13. Genome Sequence of Bradyrhizobium pachyrhizi Strain PAC48T, a Nitrogen-Fixing Symbiont of Pachyrhizus erosus (L.) Urb.

    PubMed Central

    Delamuta, Jakeline Renata Marçon; Ribeiro, Renan Augusto; Gomes, Douglas Fabiano; Souza, Renata Carolina; Chueire, Ligia Maria Oliveira

    2015-01-01

    Bradyrhizobium pachyrhizi PAC48T has been isolated from a jicama nodule in Costa Rica. The draft genome indicates high similarity with that of Bradyrhizobium elkanii. Several coding sequences (CDSs) of the stress response might help in survival in the tropics. PAC48T carries nodD1 and nodK, similar to Bradyrhizobium (Parasponia) ANU 289 and a particular nodD2 gene. PMID:26383651

  14. Filter Fabrics for Airport Drainage.

    DTIC Science & Technology

    1979-09-01

    Systems for *r- field Pavements," Harry R. Cedergren . d. "Development of Guidelines for the Design of Subsurfac( Drainage Systems for Highway Pavement...Structural 4Sectic s," H. R. Cedergren , J. A. Arman, and K. H. O’Brien. e. Drainage of Highway and Airfield Pavements, Harry R. Cedergren .> Five...by Cedergren (974).5 Additionally, several references were used, particularly those describing experimental anu construction prolects using filter

  15. A Decision-Making Methodology for Long-Range Planning.

    DTIC Science & Technology

    1987-04-01

    become an important part of the management process for Chief Executive Officers and top decision-makers through- out business and government. However...the management process ±or Ciiei axecutive OUticers (CEOs) and too decision-makers througnout ousiness anu qovernment. When decisions are made...analytical techniques and at the same time expert in the subject being studied. plus have the management an,.: leadership skills required to bring a study to

  16. Defense Standardization Program (DSP): Policies and Procedures

    DTIC Science & Technology

    1993-07-01

    insertion of new technology into systems and equipment. i. Sustain anU improve the industrial and technology base. j. Promote competition. k. Improve...allows the Department of Defense to take advan- tage of proven, current technology ; reduces risks associated with development; and supports our...manage" requirements can constrain or reduce technological innova- tions and cost-effective solutions. Standardization documents shall describe what

  17. Design of Training Systems Utility Assessment. The Training Process Flow and System Capabilities/Requirements and Resources Models Operating in the TRAPAC Environment

    DTIC Science & Technology

    1976-05-01

    TRAINING ANALYSIS AND EVALUATION GROUP TAEG REPORT NO. 33. DOTS UTILITY ASSESSMENT: The Training Process Flow anu System...purpose of the United States Government. ALFRED F. SMODE, Ph.D., Director Training Analysis & Evaluation Group TAEG REPORT NO. 33 FOREWORD The... SUMMARY 46 ill TAEG REPORT NO. 33 LIST OF FIGURES FIGURE NO. PAGE 1 DOTS SYSTEM DIAGRAM 2 FIELD TEST SCHEDULE lv TAEG REPORT NO. 33 LIST OF

  18. $200,000 Grants Awarded to CCR Researchers for HIV/AIDS Studies | Poster

    Cancer.gov

    By Nancy Parrish, Staff Writer Earlier this year, the Office of AIDS Research (OAR) awarded two, two-year grants of $200,000 each to Anu Puri, Ph.D., and Robert Blumenthal, Ph.D., both of the Center for Cancer Research (CCR) Nanobiology Program, and to Eric Freed, Ph.D., of the HIV Drug Resistance Program, for their research on potential new treatments for HIV.

  19. Solar Illumination Calculator

    DTIC Science & Technology

    1977-02-01

    I UNITED STATES AIR FORCE ~ I AIR WEATHER SERVICE (MAC) i~Ii’I ’IUSAF ENVIRONMENTAL 7 . TECHNICAL APPLICATIONS CENTER SCOTT AIR FORCE lADE, ILLINOIS... Environmental Technical Arplications~entir- Scott APB, IL 62225 11. CONTROLLING 00FICE NAME ANU ADDRE.SS 12. REPORT CATE USAr Environmental ...sun and T is a time factor express- ing the fractional value of orbital completion. The value of A, called the obli- quity of the ecliptic, can be

  20. Nitrogen fixation ability of exopolysaccharide synthesis mutants of Rhizobium sp. strain NGR234 and Rhizobium trifolii is restored by the addition of homologous exopolysaccharides.

    PubMed Central

    Djordjevic, S P; Chen, H; Batley, M; Redmond, J W; Rolfe, B G

    1987-01-01

    Several transposon Tn5-induced mutants of the broad-host-range Rhizobium sp. strain NGR234 produce little or no detectable acidic exopolysaccharide (EPS) and are unable to induce nitrogen-fixing nodules on Leucaena leucocephala var. Peru or siratro plants. The ability of these Exo- mutants to induce functioning nodules on Leucaena plants was restored by coinoculation with a Sym plasmid-cured (Nod- Exo+) derivative of parent strain NGR234, purified EPS from the parent strain, or the oligosaccharide from the EPS. Coinoculation with EPS or related oligosaccharide also resulted in formation of nitrogen-fixing nodules on siratro plants. In addition, an Exo- mutant (ANU437) of Rhizobium trifolii ANU794 was able to form nitrogen-fixing nodules on white clover in the presence of added EPS or related oligosaccharide from R. trifolii ANU843. These results demonstrate that the absence of Rhizobium EPSs can result in failure of effective symbiosis with both temperate and subtropical legumes. Images PMID:3025187

  1. FOREWORD: 17th National Conference of the Australian Meteorological and Oceanographic Society

    NASA Astrophysics Data System (ADS)

    Burns, Barbara A.; Davis, Clem; Kiss, Andrew E.; Taylor, John R.

    2010-05-01

    The Australian Meteorology and Oceanography Society (AMOS) has held an annual conference each year since 1994. The venue for the 17th conference in this series was the Australian National University (ANU) in Canberra, Australia's capital city. The conference ran over three days from 27 to 29 January 2010. The conference title was Atmospheres, Oceans, Environment and Society with the conference themes: Weather, ocean and climate forecasting Observing and modelling the integrated earth system Climate trends, variability and extremes: past, present and future Climate impacts and adaptation Antarctic weather, ocean and climate systems Ocean systems and dynamics. Local co-hosts for the conference were the Fenner School of Environment and Society (ANU) and the Research School of Earth Sciences (ANU). The conference organising committee was drawn from the members of the Australian Capital Territory centre of AMOS. The conference was very successful, attracting 300 delegates presenting 160 oral and 68 poster presentations over the three days. In a first for an AMOS National Conference, the organisers decided to produce a refereed Conference Proceedings with all presenters being invited to contribute. Each submitted paper was refereed by two anonymous reviewers selected by the conference editorial committee. The refereeing process followed the guidelines for the IOP Conference Series: Earth and Environmental Science. The result is the collection of 39 papers in this conference volume. The range of subjects covered in the papers reflects the diversity of the presentations prompted by the conference themes and the broad range of the research interests of the Australian climate, meteorology and oceanographic community. Within the proceedings the editors have presented the papers alphabetically within the theme area in which they were presented at the conference. The editorial committee wish to thank not only the authors for their contributions to this volume but also the

  2. Mapping quantitative trait loci for nitrogen uptake and utilization efficiency in rice (Oryza sativa L.) at different nitrogen fertilizer levels.

    PubMed

    Dai, G J; Cheng, S H; Hua, Z T; Zhang, M L; Jiang, H B; Feng, Y; Shen, X H; Su, Y A; He, N; Ma, Z B; Ma, X Q; Hou, S G; Wang, Y R

    2015-09-08

    Genetic improvement is the fundamental basis for improving nitrogen-use efficiency. A better understanding of genetic factors controlling nitrogen uptake and utilization is required for crop genetic improvement. In this study, we identified the quantitative trait loci (QTLs) associated with traits of nitrogen uptake and utilization by using the single-sequence repeat marker method and a recombinant inbred line (RIL) population derived from a super hybrid Xieyou9308. All the traits investigated were inherited quantitatively by continuous variation and showed normal distribution in phenotype with transgressive segregation in the RIL population. Most of the traits were significantly correlated with each other except for nitrogen absorption ability (NAA) with nitrogen harvest index (NHI) and NHI with agricultural nitrogen-absorption efficiency (ANAE). At logarithmic odds value of 2.3, total 13 candidate QTLs, including 4 for NAA, 2 for NHI, 2 for physiological nitrogen-use efficiency, 1 for agricultural nitrogen-use efficiency (ANUE), and 4 for ANAE, were detected and mapped on chromosomes 2, 3, 4, 5, 8, 9, 10, and 12. Significant pleiotropic effect or neighboring expression of QTLs was observed among traits. At position 64.8 cM on chromosome 4 near the marker RM5757, there was a QTL cluster of NAA, ANUE, and ANAE, and at chromosome 5 near the marker RM5968, there was a QTL cluster of NAA and ANUE. The QTL clusters might provide partial explanation and genetic mechanism for the observed correlations between nitrogen uptake and utilization efficiency traits and might form a basis for future breeding programs.

  3. Information Management for an Automated Battlefield Command and Control System

    DTIC Science & Technology

    1980-05-01

    rEVtL~ StJPP OFI I USL NScH- UEVEL + SIANUANDILA iP, U.K.* I AFFD)L/FGR (CUlL) I LISA NATICK~ RESLAHCH ANU UtVELUPMLNI COMMAND CHIL~q bFHAV SLIINICES DL...V, FOOL) SVA LAR HIA 0A󈧭)9 F ANi) L (ý. ANI) LS ) MILITAK(Y ASSI PflN INGi PENS TECHNUL I TRAJANA ATTN: SAJS-UH I NAVAL 418 SYSTt~i~ C;UMMANu Alihi

  4. Ballistic Testing of Armor Weldments

    DTIC Science & Technology

    1994-01-21

    Distribution unlimited %1 , A E S K T 5A •+ T K .4/ ¢ C+’ •; T . . .. This TOP describes ballistic tests to evaluate armor weldments for resistance to shock and...C-I 1. SCOPE. This TOP describes ballistic tests to evaluate armor weldments for resistance to shock and penetration...Operations Procedure (TOP) 2-2-711 Ballistic Testing of Armor Weldments WU A268445 6+ AuT I`S’•,+ r:’ 7. PERFORMING ORGANIZATION NAME(S) ANU; ADDRCSSI’t

  5. COMPUTER-Aided-Control Engineering (CACE) PRimitives for Robust and Adaptive control Systems.

    DTIC Science & Technology

    1987-10-12

    factorization approach ! [see, e.g., Desoer et al. (1980), Zames (1981), Vidyasagar (1985), Doyle (1985)], which has xmade it possible to formulate and solve...34A Kalman Filtering Approach to Short- Time Fourier Analysis", ANU Report, Canberra, Australia, Feb. 1984. C.A. Desoer , i{.W. Liu, J. Murray and R...399-412, June 1980. C.A. Desoer and M. Vidyasagar, Feedback Systems: Input-Output Properties, Academic Press, 1975. J.C. Doyle and C.C. Chu (1985

  6. Designing CPV Receivers With Reliability: Early Evaluation of Components

    NASA Astrophysics Data System (ADS)

    Vivar, M.; Everett, V.; Blakers, A.; Walter, D.; Harvey, J.; Van Scheppingen, R.; Surve, S.; Muric-Nesic, J.

    2010-10-01

    The Australian National University (ANU) is developing a new hybrid CPV/Thermal micro-concentrator (MCT) system working at a concentration ratio of 20 to 30X. System design and reliability have been integrated as a concurrent process, enabling early optimisation of the concentrator design. The key feature of this procedure is that a carefully selected set of simple tests can be conducted concurrently with the design of the concentrator module, without introducing time delays on the module design. Test results provide valuable information that significantly informs the design process and helps to avoid future failures.

  7. Seismology at the Australian National University; an interview with Anton L. Hales

    USGS Publications Warehouse

    Spall, H.

    1980-01-01

    Dr. Anton L. Hales is a leading seismologist who has just retired as Director of the Research School of Earth Sciences at the Australian National University (ANU), Canberra. Prior to that, he headed the Geosciences Division at the University of Texas at Dallas, and, before that, he was Director of the Bernard Price Institute of Geophysical Research at the University of the Witwatersrand Johannesburg, South Africa. he is about to step down as President of the International Geodynamics Commission. Dr. Hales' research has involved marine geophysics, the travel times of seismic waves, and the structure of the Earth's crust and upper mantle. 

  8. Primary Adhesively Bonded Structure Technology (PABST). Phase 2. Detail Design

    DTIC Science & Technology

    1977-12-01

    stopper :,. v 7 is bonded under the longeron. The frame tee is cutout at this intersection to allow for the longeron. It is joggled to fit on top of the...frame, and (5) a filler. The fillers occupy the gaps under the tees which allows the tees to be made in straight pieces without joggles to reduce...and are Joggled on top of the teir-stoppers to minimize fatigue problems in the skin. A typical frame tee anu internal longeron intersection is shown

  9. A Stress Factor Method for Perforated Muzzle Brake Design

    DTIC Science & Technology

    1994-02-01

    unlimited documents, destroy when the report is no longer needed. Do not return it to the originator. Sion lowý pile 2A& *Val) 1.tltVifU anu Fom AoWovod...obtained. The finite plot correspond to brake entrance Mach numbers of 1.0 element structural analysis code ABAQUS was used for both and ..5. The higher...confined to the 14,000 second-order tetrahedron elements ( ABAQUS upstream wall. as shown in Figure 3b. The pressure level C3D1O) were used, each

  10. Schemas in Problem Solving: An Integrated Model of Learning, Memory, and Instruction

    DTIC Science & Technology

    1992-01-01

    Tavmizi, R. A., & Sweller, J. (198). Guidance during mathmatical problem solving. Joura of Educaional Psychology, 80 pp. 424-436. 31 Problem-Solving...biases, and their delt values (w, PA , ANu #,n p) The model runs with alternating learning and testing phases. The learning phase runs In blocks of 100...n l romo the Pal stack) Phodu-I’ Rme4 IF fage Pal is 10solfe the pmublem but ProblsaVaue N0 " 47.00 thwn aom an ") Pa Am 47AODM THEN ("a the goal five

  11. VizieR Online Data Catalog: DYNAMO. Hα luminous galaxies sample (Green+, 2014)

    NASA Astrophysics Data System (ADS)

    Green, A. W.; Glazebrook, K.; McGregor, P. J.; Damjanov, I.; Wisnioski, E.; Abraham, R. G.; Colless, M.; Sharp, R. G.; Crain, R. A.; Poole, G. B.; McCarthy, P. J.

    2014-11-01

    We have selected a representative sample of 67 galaxies classified as star forming in the Max-Planck-Institut fur Astrophysik and Johns Hopkins University (MPA-JHU) value-added catalogue (http://www.mpa-garching.mpg.de/SDSS/DR4/) of the Sloan Digital Sky Survey (SDSS, York et al., 2000AJ....120.1579Y). Integral-field spectroscopic data were obtained using two different telescopes; the 3.9m Anglo-Australian Telescope and the ANU 2.3m Telescope, both situated at Siding Spring Observatory, Australia. (4 data files).

  12. PSN J11290437+1714095 is a Type Ia supernova (91T-like) near maximum light

    NASA Astrophysics Data System (ADS)

    Childress, M.; Owen, C.; Scalzo, R.; Yuan, F.; Schmidt, B.; Tucker, B.

    2013-12-01

    We report spectroscopic classification of PSN J11290437+1714095 with the Wide Field Spectrograph (WiFeS - Dopita et al., 2007, ApSS, 310, 255) on the ANU 2.3m telescope at Siding Spring Observatory, NSW Australia, using the B3000/R3000 gratings (3500-9800 A, 1 A resolution). PSN J11290437+1714095 was discovered by TAROT on 2013 Dec 11.09 at mag 15.9 in UGC 6483. A 20 minute spectrum of the SN on 2013 Dec 12.72 shows this to be a Type Ia supernova of the SN 1991T subclass near maximum light.

  13. Classification of PSN J13505285-3017097 as an old Type Ia SN with WiFeS

    NASA Astrophysics Data System (ADS)

    Childress, M.; Scalzo, R.; Tucker, B.; Yuan, F.; Schmidt, B.; Klotz, A.; Conseil, E.

    2013-06-01

    We report spectroscopic classification of PSN J13505285-3017097 with the Wide Field Spectrograph (WiFeS - Dopita et al., 2007, ApSS, 310, 255) on the ANU 2.3m telescope at Siding Spring Observatory, NSW Australia, using the B3000/R3000 gratings (3500-9800 A, 1 A resolution). PSN J13505285-3017097 was discovered by Conseil on 2013 May 02.22 at mag 18.4 on TAROT images, and photometric follow up shows the light curve peaks in brightness at mag 16 on 2013 May 15.

  14. A Breakfast for Bonaparte: U.S. National Security Interests from the Heights of Abraham to the Nuclear Age

    DTIC Science & Technology

    1993-07-01

    States anu its allies without an adequate American nuclear force, with all that entails. And the restless shifts in the balance of power which have...34 which is a good deal more somber and realistic as a definition of the syndrome . In the conduct 22 ON WAR AND PEACE of a nation’s foreign policy, as in...to travel, and to do business. And immigrants poured into the colonies on an astonishing scale as part of the vast and restless migration of peoples

  15. PREFACE 12th International Workshop on Slow Positron Beam Techniques

    NASA Astrophysics Data System (ADS)

    Buckman, Stephen; Sullivan, James; White, Ronald

    2011-01-01

    SLOPOS-12 included: Positron Interactions with Surfaces Positron Beam and Detector Technology Positron Interactions with Atoms and Molecules Positronium Science Defects and Vacancies in Materials Porosity and Open Volume in Materials Antimatter in Biomedical Science Anti-hydrogen Studies Positron Transport Annihilation On a sad note, delegates paid tribute to the contributions of one of our colleagues, Chris Beling, who tragically passed away shortly before the meeting. Chris' contributions to positron science and to the education of young scientists were noted in a number of the invited presentations. It is an honour for our community to begin these proceedings with a short tribute to Chris' life by Professor Paul Coleman. The Workshop could not have occurred without the generous support of our sponsors: The ARC Centre for Antimatter-Matter Studies, The Australian National University, Flinders University, James Cook University, The Institute of Physics (UK) and the Australian Government's Department of Innovation, Industry, Science and Research. It would also not have been possible without the hard work of the Local and International Organising Committees and the friendly and efficient staff at the All Seasons Resort, Magnetic Island. We are most grateful for the on-site assistance of Gillian Drew, the CAMS student and postdoc team, the financial wizardry of Chris Kalos, and the post-Workshop editorial assistance of Julia Wee and Adam Edwards. Finally we would like to thank all of the attendees at SLOPOS12 for their scientific contributions to the Workshop, and for the warm spirit of engagement which characterised the scientific discussions and social occasions. SLOPOS13 will be held in Germany in 2013 and we all look forward to the occasion. Stephen Buckman, James Sullivan and Ronald White(Guest Editors) Local Organising CommitteeInternational Committee Stephen Buckman (Chair, ANU, Canberra)G Amarendra (India) James Sullivan (Secretary, ANU, Canberra)M-F Barthe (France

  16. The Probable Progenitor of PSN J01364816+1545310 in M74

    NASA Astrophysics Data System (ADS)

    Dyk, S. D. Van; Petigura, E. A.; Cenko, S. B.; Zheng, W.; Marcy, G. W.; Howard, A. W.; Foley, R. J.; Tucker, B. E.; Kelly, P. L.; Filippenko, A. V.

    2013-07-01

    Schuyler D. Van Dyk (IPAC/Caltech), Erik A. Petigura (UC Berkeley), S. Bradley Cenko (NASA/GSFC), WeiKang Zheng, Geoffrey W. Marcy (UC Berkeley), Andrew W. Howard (U. Hawaii/IfA), Ryan J. Foley (Harvard/Smithsonian CfA), Brad E. Tucker (ANU/UC Berkeley), Patrick L. Kelly, and Alexei V. Filippenko (UC Berkeley) report the identification of the probable progenitor of PSN J01364816+1545310 in archival Hubble Space Telescope (HST) Advanced Camera for Surveys/Wide Field Channel (WFC) images in bands F435W, F555W, and F814W from 2003 November and 2005 June.

  17. Horizontal Disc Random Array Performance. Hydrophone Arrays of Omnidirectional, Cardioid, and Iso-Opt Hypercardioid Elements Analyzed for Noise Gain and Directional Response in Vertically Directive Noise

    DTIC Science & Technology

    1979-09-10

    1) HORIC’NTAL-,DISCZAND0,M1 ARA AC.-- Final /1 ~3 rpnfl I I\\of 02 ~~fC’’.,c41jiud, anu iso -npt hyper Octsba 078-Spmef J979 card ioid elemeints...8217 16 onniidirectional. f cardioid, or iso -opt hypercardioid c:lenienrts inl verticallx’ directive mind isotropic ambient sea I noise. Assume that the...is30H. NtIIC wavelength splac:iig is reLliircd if’ 11) is 25 Hz,. 3.Co mpared to a single~ directional element ailone,: al array of I16 iso -Opt h\\v

  18. Effect of soiling in CPV systems

    SciTech Connect

    Vivar, M.; Herrero, R.; Anton, I.; Martinez-Moreno, F.; Moreton, R.; Sala, G.

    2010-07-15

    The effect of soiling in flat PV modules has been already studied, causing a reduction of the electrical output of 4% on average. For CPV's, as far as soiling produces light scattering at the optical collector surface, the scattered rays should be definitively lost because they cannot be focused onto the receivers again. While the theoretical study becomes difficult because soiling is variable at different sites, it becomes easier to begin the monitoring of the real field performance of concentrators and then raise the following question: how much does the soiling affect to PV concentrators in comparison with flat panels?' The answers allow to predict the PV concentrator electrical performance and to establish a pattern of cleaning frequency. Some experiments have been conducted at the IES-UPM and CSES-ANU sites, consisting in linear reflective concentration systems, a point focus refractive concentrator and a flat module. All the systems have been measured when soiled and then after cleaning, achieving different increases of I{sub SC}. In general, results show that CPV systems are more sensitive to soiling than flat panels, accumulating losses in I{sub SC} of about 14% on average in three different tests conducted at IES-UPM and CSES-ANU test sites in Madrid (Spain) and Canberra (Australia). Some concentrators can reach losses up to 26% when the system is soiled for 4 months of exposure. (author)

  19. Abundances of uranium, thorium, and potassium for some Australian crystalline rocks

    USGS Publications Warehouse

    Bunker, Carl Maurice; Bush, C.A.; Munroe, Robert J.; Sass, J.H.

    1975-01-01

    This report contains a tabulation of the basic radioelement and radiogenic heat data obtained during an Australian National University (ANU) - United States Geological Survey (USGS) heat-flow project, directed jointly by J. C. Jaeger (ANU) and J. H. Sass (USGS). Most samples were collected during the periods June through September, 1971 and 1972. The measurements were made subsequently by two of us (C. M. Bunker and C. A. Bush) using the gamma-ray spec trometric techniques described by Bunker and Bush (1966, 1967). Interpreting the spectra for quantitative analyses of the radioelements was accomplished with an iterative leastsquares computer program modified from one by Schonfeld (1966). Uranium content determined by gamma-ray spectrometry is based on a measurement of the daughter products of 226Ra. Equilibrium in the uranium-decay series was assumed for these analyses . Throughout the report, when U content is stated, radium-equivalent uranium is implied. The coefficient of variation for the accuracy of the radioelement data, when compared to ana lyses by isotope dilution and flame photometry is about 3 percent for radium-equivalent uranium and thorium and about 1 percent for potassium. These percentages are in addition to minimum standard deviations of about 0.05 ppm for U and Th, and about 0.03 percent for K.

  20. Basic data for some recent Australian heat-flow measurements

    USGS Publications Warehouse

    Munroe, Robert J.; Sass, J.H.; Milburn, G.T.; Jaeger, J.C.; Tammemagi, H.Y.

    1975-01-01

    This report has been compiled to provide background information and detailed temperature and thermal conductivity data for the heat-flow values reported in Sass, Jaeger, and Munroe (in press). The data were collected as part of a joint heat-flow study by the Australian National University (ANU) and the U.S. Geological Survey (USGS) under the direction of J. C. Jaeger (ANU) and J. H. Sass (USGS). The format is similar to that used for basic data from United States heat-flow determinations (Sass and Munroe, 1974). Each section contains a state map showing the geographic distribution of heat-flow data followed by tables which list individual temperatures, thermal conductivities, and radiogenic heat production values. A companion volume (Bunker and others, 1975) gives details of the heat-production measurements together with individual radioelement concentrations. Localities are arranged in alphabetical order within each state. The methods and techniques of measurements have been described by Sass and others (1971a, b). Unusual methods or procedures which differ markedly from these techniques are noted and described in the comments sections of the tables.

  1. Electrodeposition and characterisation of lead tin superconducting films for application in heavy ion booster

    NASA Astrophysics Data System (ADS)

    Lobanov, Nikolai R.

    2015-12-01

    The ANU has developed experimental systems and procedures for lead-tin (PbSn) film deposition and characterisation. The 12 split loop resonators have been electroplated with 96%Pb4%Sn film to the final thickness of 1.5 micron using methanesulfonic acid (MSA) chemistry. As a result, an average acceleration field of 3.6 MV/m off-line at 6 W rf power was achieved at extremely low technological cost. Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Heavy Ion Elastic Detection Analyses (HIERDA), Rutherford Backscattering Spectroscopy (RBS), Secondary Ion Mass Spectroscopy (SIMS) and Electron Backscattering Diffraction (EBSD) revealed correlation between the substrate and film structure, morphology and the rf performance of the cavity. The PbSn plating, exercised on the existing split loop resonators (SLR), has been extended to the two stub quarter wave resonator (QWR) as a straightforward step to quickly explore the superconducting performance of the new geometry. The oxygen free copper (OHFC) substrate for two stub QWR was prepared by reverse pulse electropolishing. The ultimate superconducting properties and long-term stability of the coatings have been assessed by operation of the ANU superconducting linac over the last few years.

  2. Lithosphere thickness and mantle viscosity inverted from GPS-derived deformation rates in Fennoscandia

    NASA Astrophysics Data System (ADS)

    Zhao, S.; Lambeck, K.; Lidberg, M.

    2012-07-01

    Crustal deformation in Fennoscandia is associated with the glacial isostatic adjustment (GIA) process that is caused by ongoing stress release of the mantle after removal of the Late Pleistocene ice sheet by ˜10 cal ka BP. With an earth model of defined structure and rheology and an ice-sheet model of known melting history, the GIA process can be simulated by geophysical models, and the surface deformation rates can be calculated and used to compare with global positioning system (GPS) observations. Therefore, the crustal deformation rates observed by GPS in Fennoscandia provide constraints on the geophysical models. On the basis of two ice sheet models (ANU-ICE and ICE-5G) reconstructed independently by the Australian National University (ANU) and University of Toronto, we use the GPS-derived deformation rates to invert for lithosphere thickness and mantle viscosity in Fennoscandia. The results show that only a three-layer earth model can be resolved from current GPS data, providing robust estimates of effective lithosphere thickness, upper and lower mantle viscosity. The earth models estimated from inversion of GPS data with two different ice sheet models define a narrow range of parameter space: the lithosphere thickness between 93 and 110 km, upper mantle viscosity between 3.4 and 5.0 × 1020 Pa s, and lower mantle viscosity between 7 × 1021 and 13 × 1021 Pa s. The estimates are consistent with those inverted from relative sea-level indicators.

  3. Photocatalitic Properties of Tio2 and ZnO Nanopowders / Tio2 un Zno Nanopulveru Fotokatalitiskās Īpašības

    NASA Astrophysics Data System (ADS)

    Grigorjeva, L.; Rikveilis, J.; Grabis, J.; Jankovica, Dz.; Monty, C.; Millers, D.; Smits, K.

    2013-08-01

    Photocatalytic activity of TiO2 and ZnO nanopowders is studied depending on the morphology, grain sizes and method of synthesizing. Photocatalysis of the prepared powders was evaluated by degradation of the methylene blue aqueous solution. Absorbance spectra (190-100 nm) were measured during exposure of the solution to UV light. The relationships between the photocatalytic activity and the particle size, crystal polymorph phases and grain morphology were analyzed. The photocatalytic activity of prepared TiO2 nanopowders has been found to depend of the anatase-to-rutile phase ratio. Comparison is given for the photocatalytic activity of ZnO nanopowders prepared by sol-gel and solar physical vapour deposition (SPVD) methods Darbā pētīta fotokatalīzes efektivitāte ar dažādām metodēm sintezētiem TiO2 and ZnO nanopulveriem, kuriem ir atšķirīga morfoloģija un grauda izmērs. Foto katalīzes process raksturots ar metilenzilā sagraušanu ūdens šķīdumā, to apstarojot ar UV gaismu. Analizēta fotokatalīzes efektivitātes atkarība no grauda izmēra, nanokristālu graudu morfoloģijas, TiO2 nanopulveru anatasa-rutīla fāžu svara attiecībām. Parādīts, ka fotokatalītiskā efektivitāte ir atšķirīga TiO2 nanopulveriem sintezētiem ar dažādām metodēm: sola-gēla un tvaicēšanu-kondensēšanu saules reaktorā. Salīdzināta fotokatalīzes efektivitāte ZnO un TiO2 nanopulveriem un secināts, ka ZnO nanopulveri ar tetrapodu morfoloģiju ir labs fotokatalizators

  4. Genetic snapshots of the Rhizobium species NGR234 genome

    PubMed Central

    Viprey, Virginie; Rosenthal, André; Broughton, William J; Perret, Xavier

    2000-01-01

    Background: In nitrate-poor soils, many leguminous plants form nitrogen-fixing symbioses with members of the bacterial family Rhizobiaceae. We selected Rhizobium sp. NGR234 for its exceptionally broad host range, which includes more than I 12 genera of legumes. Unlike the genome of Bradyrhizobium japonicum, which is composed of a single 8.7 Mb chromosome, that of NGR234 is partitioned into three replicons: a chromosome of about 3.5 Mb, a megaplasmid of more than 2 Mb (pNGR234b) and pNGR234a, a 536,165 bp plasmid that carries most of the genes required for symbioses with legumes. Symbiotic loci represent only a small portion of all the genes coded by rhizobial genomes, however. To rapidly characterize the two largest replicons of NGR234, the genome of strain ANU265 (a derivative strain cured of pNGR234a) was analyzed by shotgun sequencing. Results: Homology searches of public databases with 2,275 random sequences of strain ANU265 resulted in the identification of 1,130 putative protein-coding sequences, of which 922 (41%) could be classified into functional groups. In contrast to the 18% of insertion-like sequences (ISs) found on the symbiotic plasmid pNGR234a, only 2.2% of the shotgun sequences represent known ISs, suggesting that pNGR234a is enriched in such elements. Hybridization data also indicate that the density of known transposable elements is higher in pNGR234b (the megaplasmid) than on the chromosome. Rhizobium-specific intergenic mosaic elements (RIMEs) were found in 35 shotgun sequences, 6 of which carry RIME2 repeats previously thought to be present only in Rhizobium meliloti. As non-overlapping shotgun sequences together represent approximately 10% of ANU265 genome, the chromosome and megaplasmid may carry a total of over 200 RIMEs. Conclusions: 'Skimming' the genome of Rhizobium sp. NGR234 sheds new light on the fine structure and evolution of its replicons, as well as on the integration of symbiotic functions in the genome of a soil bacterium

  5. GHG emissions inventory for on-road transportation in the town of Sassari (Sardinia, Italy)

    NASA Astrophysics Data System (ADS)

    Sanna, Laura; Ferrara, Roberto; Zara, Pierpaolo; Duce, Pierpaolo

    2016-04-01

    The IPCC Fifth Assessment Report (AR5) accounts an increase of the total annual anthropogenic GHG emissions between 2000 and 2010 that directly came from the transport sector. In 2010, 14% of GHG emissions were released by transport and fossil-fuel-related CO2 emissions reached about 32 GtCO2 per year. The report also considers adaptation and mitigation as complementary strategies for reducing the risks of climate change for sustainable development of urban areas. This paper describes the on-road traffic emission estimated in the framework of a Sardinian regional project [1] for the town of Sassari (Sardinia, Italy), one of the Sardinian areas where the fuel consumption for on-road transportation purposes is higher [2]. The GHG emissions have been accounted (a) by a calculation-based methodology founded on a linear relationship between source activity and emission, and (b) by the COPERT IV methodology through the EMITRA (EMIssions from road TRAnsport) software tool [3]. Inventory data for annual fossil fuel consumption associated with on-road transportation (diesel, gasoline, gas) have been collected through the Dogane service, the ATP and ARST public transport services and vehicle fleet data are available from the Public Vehicle Database (PRA), using 2010 as baseline year. During this period, the estimated CO2 emissions accounts for more than 180,000 tCO2. The calculation of emissions due to on-road transport quantitatively estimates CO2 and other GHG emissions and represents a useful baseline to identify possible adaptation and mitigation strategies to face the climate change risks at municipal level. Acknowledgements This research was funded by the Sardinian Regional Project "Development, functional checking and setup of an integrated system for the quantification of CO2 net exchange and for the evaluation of mitigation strategies at urban and territorial scale", (Legge Regionale 7 agosto 2007, No. 7). References [1] Sanna L., Ferrara R., Zara P. & Duce P. (2014

  6. 14C sample preparation for AMS microdosing studies at Lund University using online combustion and septa-sealed vials

    NASA Astrophysics Data System (ADS)

    Sydoff, Marie; Stenström, Kristina

    2010-04-01

    The Department of Physics at Lund University is participating in a European Union project called EUMAPP (European Union Microdose AMS Partnership Programme), in which sample preparation and accelerator mass spectrometry (AMS) measurements of biological samples from microdosing studies have been made. This paper describes a simplified method of converting biological samples to solid graphite for 14C analysis with AMS. The method is based on online combustion of the samples, and reduction of CO 2 in septa-sealed vials. The septa-sealed vials and disposable materials are used to eliminate sample cross-contamination. Measurements of ANU and Ox I standards show deviations of 2% and 3%, respectively, relative to reference values. This level of accuracy is sufficient for biological samples from microdosing studies. Since the method has very few handling steps from sample to graphite, the risk of failure during the sample preparation process is minimized, making the method easy to use in routine preparation of samples.

  7. CICADA -- Configurable Instrument Control and Data Acquisition

    NASA Astrophysics Data System (ADS)

    Young, Peter J.; Roberts, William H.; Sebo, Kim M.

    CICADA (Young et al. 1997) is a multi-process, distributed application for the control of astronomical data acquisition systems. It comprises elements that control the operation of, and data flow from CCD camera systems; and the operation of telescope instrument control systems. CICADA can be used to dynamically configure support for astronomical instruments that can be made up of multiple cameras and multiple instrument controllers. Each camera is described by a hierarchy of parts that are each individually configured and linked together. Most of CICADA is written in C++ and much of the configurability of CICADA comes from the use of inheritance and polymorphism. An example of a multiple part instrument configuration -- a wide field imager (WFI) -- is described here. WFI, presently under construction, is made up of eight 2k x 4k CCDs with dual SDSU II controllers and will be used at Siding Spring's ANU 40in and AAO 3.9m telescopes.

  8. Problems of contamination in 36Cl studies

    NASA Astrophysics Data System (ADS)

    Bird, J. R.; Shahgholi, N.; Jenkinson, A.; Smith, A.; Fifield, L. K.; Ophel, T.; Allan, G.

    1990-12-01

    The joint ANSTO/ANU 36Cl program has now measured more than 700 samples from many different locations. During the course of this work, a variety of contamination problems have affected a small number of results which have provided valuable information on the effects of ion source cross-talk, sample preparation and storage procedures and sources of high- 36Cl material. A sample of Weeks Island halite is processed along with every batch of field samples and the observed ratio provides a clear distinction between normal batches and those subject to contamination. Over three years, the long-term average ratio of {36Cl}/{Cl} for normal halite samples is (1 ± 1) × 10 -15. The sample handling procedures developed during the course of this work provide a useful guide to the techniques that must be used to achieve the sensitivity limits which are potentially available using AMS.

  9. Imaging photomultiplier array with integrated amplifiers and high-speed USB interfacea)

    NASA Astrophysics Data System (ADS)

    Blacksell, M.; Wach, J.; Anderson, D.; Howard, J.; Collis, S. M.; Blackwell, B. D.; Andruczyk, D.; James, B. W.

    2008-10-01

    Multianode photomultiplier tube (PMT) arrays are finding application as convenient high-speed light sensitive devices for plasma imaging. This paper describes the development of a USB-based "plug-n-play" 16-channel PMT camera with 16bits simultaneous acquisition of 16 signal channels at rates up to 2MS/s per channel. The preamplifiers and digital hardware are packaged in a compact housing which incorporates magnetic shielding, on-board generation of the high-voltage PMT bias, an optical filter mount and slits, and F-mount lens adaptor. Triggering, timing, and acquisition are handled by four field-programmable gate arrays (FPGAs) under instruction from a master FPGA controlled by a computer with a LABVIEW interface. We present technical design details and specifications and illustrate performance with high-speed images obtained on the H-1 heliac at the ANU.

  10. An Investigation of the Sound Generated by an Axisymmetric Jet Interacting with a Diffuser

    DTIC Science & Technology

    1980-09-01

    Manager, Research Division Directorate of Technology Approved for publication: FOR THE COMMANDER MARION L. LASTER Director of Technology Deputy for...105. 120. J:’REt~U EN C Y, HZ ~OU~U PO~ER ZN’ChNSITY bEVEb,OB TOTA5 POdER ,DB C1/30CTAVK ~ANU) e.,n 209. 74.95 7o.u2 75.72 74.27 75.O7 2bO. 75.78...86.52 86.26 104.53 31500. 79.40 87.33 89.52 87.93 85.46 83.91 82.79 101.88 40000. 76.44 84.35 87.03 85.60 83.32 81.93 81.21 99.43 TOTAL POdER , DB

  11. Classification of PSN J20065788-5625312 as a Type Ia SN near max with WiFeS

    NASA Astrophysics Data System (ADS)

    Childress, M.; Scalzo, R.; Yuan, F.; Schmidt, B.; Tucker, B.

    2013-07-01

    We report spectroscopic classification of PSN J20065788-5625312 as a SN Ia near max based on a 40 minute spectrum obtained with the Wide Field Spectrograph (WiFeS - Dopita et al., 2007, ApSS, 310, 255) on the ANU 2.3m telescope at Siding Spring Observatory, NSW Australia, using the B3000/R3000 gratings (3500-9800 A, 1 A resolution). PSN J20065788-5625312 was discovered by Peter Marples and Greg Bock on 2013 July 31.51 at 17.4 mag, and our spectrum with WiFeS on 2013 July 31.64 indicates it is a Type Ia around maximum light.

  12. PSN J02455988-0734270 in NGC 1084 is a young type II-P SN

    NASA Astrophysics Data System (ADS)

    Childress, M.; Scalzo, R.; Yuan, F.; Schmidt, B.

    2012-08-01

    We report the spectroscopic classification of the optical transient PSN J02455988-0734270 in NGC 1084 (disc. 2012-08-11.039 by B. Monard) based on an optical spectrum taken with the Wide Field Spectrograph (WiFeS - Dopita et al., 2007, ApSS, 310, 255) on the ANU 2.3m telescope at Siding Spring Observatory, NSW Australia, using the B3000/R3000 gratings (3600-10000, 1A resolution). The transient spectrum was compared to supernova spectral templates using SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) indicating it to be a supernova of type II-P at a very young age, perhaps only a few days after explosion.

  13. Towards an innovative spectral-splitting hybrid PV-T micro-concentrator

    NASA Astrophysics Data System (ADS)

    Everett, Vernie; Wu, Yiliang; Resch, Alois; Ebert, Matthieu; Vivar, Marta; Thomsen, Elizabeth; Harvey, Judy; Scott, Paul; Greaves, Michael; Tanner, Andrew; Blakers, Andrew

    2012-10-01

    A hybrid concentrator PV-Thermal (CPV-T) system for delivery of electricity and 150°C hot fluid in a structure suitable for roof-top installation on domestic, commercial, and industrial buildings is being developed by ANU in collaboration with the University of New South Wales, CSIRO, and industry partners. A first design based on beam-splitting utilising liquid-absorption filters is being analysed, with a study of the most suitable candidate fluids. An initial selection of four liquids was conducted; with the liquids subjected to accelerated tests to analyse their long-term performance and possible optical and chemical degradation. Some of the fluids showed optical changes after high temperature test and UV exposure, leading to slight yellowing.

  14. Imaging photomultiplier array with integrated amplifiers and high-speed USB interface.

    PubMed

    Blacksell, M; Wach, J; Anderson, D; Howard, J; Collis, S M; Blackwell, B D; Andruczyk, D; James, B W

    2008-10-01

    Multianode photomultiplier tube (PMT) arrays are finding application as convenient high-speed light sensitive devices for plasma imaging. This paper describes the development of a USB-based "plug-n-play" 16-channel PMT camera with 16 bits simultaneous acquisition of 16 signal channels at rates up to 2 MSs per channel. The preamplifiers and digital hardware are packaged in a compact housing which incorporates magnetic shielding, on-board generation of the high-voltage PMT bias, an optical filter mount and slits, and F-mount lens adaptor. Triggering, timing, and acquisition are handled by four field-programmable gate arrays (FPGAs) under instruction from a master FPGA controlled by a computer with a LABVIEW interface. We present technical design details and specifications and illustrate performance with high-speed images obtained on the H-1 heliac at the ANU.

  15. Performance of the High Resolution, Multi-collector Helix MC Plus Noble Gas Mass Spectrometer at the Australian National University

    NASA Astrophysics Data System (ADS)

    Zhang, Xiaodong; Honda, Masahiko; Hamilton, Doug

    2016-12-01

    Performance of the Helix MC Plus noble gas mass spectrometer installed at the Australian National University (ANU) is reported. Results for sensitivity, mass discrimination and their linearity against partial pressure of noble gases, and mass resolution of the mass spectrometer are presented, and the results are compared with those of conventional noble gas mass spectrometers. The application of the five detectors on the Helix MC Plus in measuring various noble gas isotopes in multi-collector modes and the integration of the software drivers of peripheral hardware devices into the controlling program Qtegra of the mass spectrometer are discussed. High mass resolution (>1800) and mass resolving power (>8000) make this mass spectrometer unique in noble gas cosmo-geochemistry. It provides the capability to measure isobaric interference-free noble gas isotopes in multi-collector mode, significantly improves the accuracy to determine isotopic ratios, and greatly increases the efficiency of data acquisition.

  16. Compact stars and accretion disks: Workshop summary

    NASA Astrophysics Data System (ADS)

    Li, J.

    1998-07-01

    A workshop on `Compact Stars and Accretion Disks' was held on 11-12 August 1997 at the Australian National University. The workshop was opened by Professor Jeremy Mould, the Director of Mount Stromlo Observatory. The workshop was organised to coincide with visits to the ANU Astrophysical Theory Centre by Professor Ron Webbink from the University of Illinois, Professor Rainer Wehrse from the University of Heidelberg and Dr Chris Tout from the University of Cambridge. The workshop attracted over 25 participants nationwide. Participants included members of the Special Research Centre for Theoretical Astrophysics, University of Sydney, led by Professor Don Melrose, Professor Dick Manchester from the ATNF, Professor Ravi Sood from ADFA, Dr John Greenhill from the University of Tasmania and Dr Rosemary Mardling from Monash University. Dr Helen Johnston from AAO and Dr Kurt Liffman from AFDL also attended the workshop. The abstracts of twelve of the workshop papers are presented in this summary.

  17. Development and testing of SYNROC for high level radioactive waste fixation

    SciTech Connect

    Reeve, K.D.; Levins, D.M.; Ramm, E.J.; Woolfrey, J.L.; Buykx, W.J.; Ryan, R.K.; Chapman, J.F.

    1981-01-01

    Research and development on the SYNROC concept for high level radioactive waste fixation commenced at the Australian Atomic Energy Commission Research Establishment, Lucas Heights, in March 1979, in collaboration with a complementary program at The Australian National University (ANU). The present paper reports progress in the project's second year and reviews its current status. An inactive 30 kg-scale SYNROC fabrication line incorporating in-can hot pressing as the fabrication step has been built for operation in mid-1981. Atmospheric pressure and hydrothermal leach tests are demonstrating the excellent leach resistance of SYNROC. Accelerated radiation damage tests using fast neutrons are simulating damage in SYNROC for periods of close to 10/sup 6/ years. In supporting research, mineral phase development, impact friability and thermophysical properties of SYNROC are being studied. 21 refs.

  18. Imaging photomultiplier array with integrated amplifiers and high-speed USB interface

    SciTech Connect

    Blacksell, M.; Wach, J.; Anderson, D.; Howard, J.; Collis, S. M.; Blackwell, B. D.; Andruczyk, D.; James, B. W.

    2008-10-15

    Multianode photomultiplier tube (PMT) arrays are finding application as convenient high-speed light sensitive devices for plasma imaging. This paper describes the development of a USB-based 'plug-n-play' 16-channel PMT camera with 16 bits simultaneous acquisition of 16 signal channels at rates up to 2 MS/s per channel. The preamplifiers and digital hardware are packaged in a compact housing which incorporates magnetic shielding, on-board generation of the high-voltage PMT bias, an optical filter mount and slits, and F-mount lens adaptor. Triggering, timing, and acquisition are handled by four field-programmable gate arrays (FPGAs) under instruction from a master FPGA controlled by a computer with a LABVIEW interface. We present technical design details and specifications and illustrate performance with high-speed images obtained on the H-1 heliac at the ANU.

  19. Salvage and Recovery Data Book -- Static Lift Forces.

    DTIC Science & Technology

    1979-06-01

    les eeimts was av i a t i o n gasoline . ‘Fhme e f f e c t i v e h u o v a u m e of a sy s t e m of t h is type is 10 to 20 pounds per cubic foot...a i v , , ’C,’nc r a t i oul mime ch anu ~m ims iii a laboratory status. Hydrog en is time idea l b u o v aulC ,’v u~as hce:u u \\ c it lm:i ~ I...all tIme rea ct ion products go u mi to I hm e pontoon and f u ll t Ime ava i lab le space. In addit ion to Ilk’ n il r ogeu m ami d h ydrogen. I h

  20. Single detector stereo-SCIDAR for Mount Stromlo: data analysis

    NASA Astrophysics Data System (ADS)

    Korkiakoski, Visa; Osborn, James; Grosse, Doris; Thorn, Elliott; Piatrou, Piotr; Bennet, Francis; Rigaut, Francois

    2016-09-01

    Satellite tracking and imaging is conducted by the ANU Research School of Astronomy and Astrophysics (RSAA) and Electro-Optic Systems at Mount Stromlo as part of the Space Environment Management Cooperative Research Centre to support debris tracking. To optimally design adaptive optics systems for those applications, it is important to know the atmospheric profile, i.e. how the turbulence is distributed as a function altitude. We have designed a new stereo-SCIDAR instrument1 to conduct a site characterisation campaign at Mount Stromlo site. This paper summarises our current progress: specifications, design choices and post-processing techniques. In particular, we compare two different post-processing algorithms for stereo-SCIDAR, using simulated data cubes. One of the codes is implemented by the RSAA, the other by the Centre for Advanced Instrumentation, University of Durham. The comparison shows that the current implementations of both codes produce decent results. However, we can see potential for further improvements.

  1. High cone-angle x-ray computed micro-tomography with 186 GigaVoxel datasets

    NASA Astrophysics Data System (ADS)

    Myers, Glenn R.; Latham, Shane J.; Kingston, Andrew M.; Kolomazník, Jan; Krajíček, Václav; Krupka, TomáÅ.¡; Varslot, Trond K.; Sheppard, Adrian P.

    2016-10-01

    X-ray computed micro-tomography systems are able to collect data with sub-micron resolution. This high- resolution imaging has many applications but is particularly important in the study of porous materials, where the sub-micron structure can dictate large-scale physical properties (e.g. carbonates, shales, or human bone). Sample preparation and mounting become diffiult for these materials below 2mm diameter: consequently, a typical ultra-micro-CT reconstruction volume (with sub-micron resolution) will be around 3k x 3k x 10k voxels, with some reconstructions becoming much larger. In this paper, we discuss the hardware (MPI-parallel CPU/GPU) and software (python/C++/CUDA) tools used at the ANU CTlab to reconstruct 186 GigaVoxel datasets.

  2. An ecodesign method for reducing the effects of hazardous substances in the product lifecycle

    NASA Astrophysics Data System (ADS)

    Simanovska, J.; Valters, K.; Bažbauers, G.; Luttropp, C.

    2012-10-01

    ārtējo vidi novēršanu. Tāpēc radīta jauna, daļēji kvantitatīva ekodizaina metode, apvienojot produktu izstrādes prasības ar zinātniskā ķīmiskā riska novērtēšanas principiem, kas piedāvā bīstamo īpašību prioritizēšanu, izmantojot Globāli harmonizētās sistēmas ķīmisko vielu klasifikācijas kodus, kā arī iedarbības un materiālu efektivitātes aspektu prioritizēšanu. Metode tika aprobēta, demonstrējot tās izmantošanu. Metode ļauj produkta izstrādātājam identificēt pārmaiņu nepieciešamību, izstrādāt ekodizaina priekšlikumus, izvērtēt alternatīvas, un palīdz uzlabot saziņu par materiālu īpašībām un ietekmi uz vidi un cilvēka veselību izejvielu un produktu piegādes ķēdē.

  3. It Takes A 'Village of Partnerships' To Raise A 'Big Data Facility' In A 'Big Data World'.

    NASA Astrophysics Data System (ADS)

    Evans, B. J. K.; Wyborn, L. A.

    2015-12-01

    The National Computational Infrastructure (NCI) at the Australian National University (ANU) has collocated a priority set of national and international data assets that span a wide range of domains from climate, oceans, geophysics, environment, astronomy, bioinformatics and the social sciences. The data are located on a 10 PB High Performance Data (HPD) Node that is integrated with a High Performance Computing (HPC) facility to enable a new style of Data-intensive in-situ analysis. Investigators can either log in via direct access to the data collections: access is also provided via modern standards-based web services. The NCI integrated HPD/HPC facility is supported by a 'village' of partnerships. NCI itself operates as a formal partnership between the ANU and three major National Scientific Agencies: CSIRO, the Bureau of Meteorology (BoM) and Geoscience Australia (GA). These same agencies are also the custodians of many of the national data collections hosted at NCI, and in partnership with other collaborating national and overseas organisations have agreed to work together to develop a shared data environment and use standards that enable interoperability between the collections, rather than isolating their collections as separate entities that each agency runs independently. To effectively analyse these complex and large volume data sets, NCI has entered into a series of national and national partnerships with international agencies to provide world-class digital analytical environments that allow computational to be conducted and shared. The ability for government and research to work in partnership at the NCI has been well established over the last decade, mainly with BoM, CSIRO, and GA. New emerging industry linkages are now being encouraged by revised government agendas and these promises to foster a new series of partnerships that will increase uptake of this major government funded infrastructure and promise to foster further collaboration and innovation.

  4. An assessment of the ICE6G_C(VM5a) glacial isostatic adjustment model

    NASA Astrophysics Data System (ADS)

    Purcell, A.; Tregoning, P.; Dehecq, A.

    2016-05-01

    The recent release of the next-generation global ice history model, ICE6G_C(VM5a), is likely to be of interest to a wide range of disciplines including oceanography (sea level studies), space gravity (mass balance studies), glaciology, and, of course, geodynamics (Earth rheology studies). In this paper we make an assessment of some aspects of the ICE6G_C(VM5a) model and show that the published present-day radial uplift rates are too high along the eastern side of the Antarctic Peninsula (by ˜8.6 mm/yr) and beneath the Ross Ice Shelf (by ˜5 mm/yr). Furthermore, the published spherical harmonic coefficients—which are meant to represent the dimensionless present-day changes due to glacial isostatic adjustment (GIA)—contain excessive power for degree ≥90, do not agree with physical expectations and do not represent accurately the ICE6G_C(VM5a) model. We show that the excessive power in the high-degree terms produces erroneous uplift rates when the empirical relationship of Purcell et al. (2011) is applied, but when correct Stokes coefficients are used, the empirical relationship produces excellent agreement with the fully rigorous computation of the radial velocity field, subject to the caveats first noted by Purcell et al. (2011). Using the Australian National University (ANU) groups CALSEA software package, we recompute the present-day GIA signal for the ice thickness history and Earth rheology used by Peltier et al. (2015) and provide dimensionless Stokes coefficients that can be used to correct satellite altimetry observations for GIA over oceans and by the space gravity community to separate GIA and present-day mass balance change signals. We denote the new data sets as ICE6G_ANU.

  5. HATS-3b: An Inflated Hot Jupiter Transiting an F-type Star

    NASA Astrophysics Data System (ADS)

    Bayliss, D.; Zhou, G.; Penev, K.; Bakos, G. Á.; Hartman, J. D.; Jordán, A.; Mancini, L.; Mohler-Fischer, M.; Suc, V.; Rabus, M.; Béky, B.; Csubry, Z.; Buchhave, L.; Henning, T.; Nikolov, N.; Csák, B.; Brahm, R.; Espinoza, N.; Noyes, R. W.; Schmidt, B.; Conroy, P.; Wright, D. J.; Tinney, C. G.; Addison, B. C.; Sackett, P. D.; Sasselov, D. D.; Lázár, J.; Papp, I.; Sári, P.

    2013-11-01

    We report the discovery by the HATSouth survey of HATS-3b, a transiting extrasolar planet orbiting a V = 12.4 F dwarf star. HATS-3b has a period of P = 3.5479 days, mass of Mp = 1.07 M J, and radius of Rp = 1.38 R J. Given the radius of the planet, the brightness of the host star, and the stellar rotational velocity (vsin i = 9.0 km s-1), this system will make an interesting target for future observations to measure the Rossiter-McLaughlin effect and determine its spin-orbit alignment. We detail the low-/medium-resolution reconnaissance spectroscopy that we are now using to deal with large numbers of transiting planet candidates produced by the HATSouth survey. We show that this important step in discovering planets produces log g and T eff parameters at a precision suitable for efficient candidate vetting, as well as efficiently identifying stellar mass eclipsing binaries with radial velocity semi-amplitudes as low as 1 km s-1. The HATSouth network is operated by a collaboration consisting of Princeton University (PU), the Max Planck Institute für Astronomie (MPIA), and the Australian National University (ANU). The station at Las Campanas Observatory (LCO) of the Carnegie Institute is operated by PU in conjunction with collaborators at the Pontificia Universidad Católica de Chile (PUC), the station at the High Energy Spectroscopic Survey (HESS) site is operated in conjunction with MPIA, and the station at Siding Spring Observatory (SSO) is operated jointly with ANU.

  6. HATS-5b: A Transiting Hot Saturn from the HATSouth Survey

    NASA Astrophysics Data System (ADS)

    Zhou, G.; Bayliss, D.; Penev, K.; Bakos, G. Á.; Hartman, J. D.; Jordán, A.; Mancini, L.; Mohler, M.; Csubry, Z.; Ciceri, S.; Brahm, R.; Rabus, M.; Buchhave, L.; Henning, T.; Suc, V.; Espinoza, N.; Béky, B.; Noyes, R. W.; Schmidt, B.; Butler, R. P.; Shectman, S.; Thompson, I.; Crane, J.; Sato, B.; Csák, B.; Lázár, J.; Papp, I.; Sári, P.; Nikolov, N.

    2014-06-01

    We report the discovery of HATS-5b, a transiting hot Saturn orbiting a G-type star, by the HATSouth survey. HATS-5b has a mass of Mp ≈ 0.24 M J, radius of Rp ≈ 0.91 R J, and transits its host star with a period of P ≈ 4.7634 days. The radius of HATS-5b is consistent with both theoretical and empirical models. The host star has a V-band magnitude of 12.6, mass of 0.94 M ⊙, and radius of 0.87 R ⊙. The relatively high scale height of HATS-5b and the bright, photometrically quiet host star make this planet a favorable target for future transmission spectroscopy follow-up observations. We reexamine the correlations in radius, equilibrium temperature, and metallicity of the close-in gas giants and find hot Jupiter-mass planets to exhibit the strongest dependence between radius and equilibrium temperature. We find no significant dependence in radius and metallicity for the close-in gas giant population. The HATSouth network is operated by a collaboration consisting of Princeton University (PU), the Max Planck Institute für Astronomie (MPIA), and the Australian National University (ANU). The station at Las Campanas Observatory (LCO) of the Carnegie Institute is operated by PU in conjunction with collaborators at the Pontificia Universidad Católica de Chile (PUC), the station at the High Energy Spectroscopic Survey (HESS) site is operated in conjunction with MPIA, and the station at Siding Spring Observatory (SSO) is operated jointly with ANU. This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.

  7. HATS-1b: The First Transiting Planet Discovered by the HATSouth Survey

    NASA Astrophysics Data System (ADS)

    Penev, K.; Bakos, G. Á.; Bayliss, D.; Jordán, A.; Mohler, M.; Zhou, G.; Suc, V.; Rabus, M.; Hartman, J. D.; Mancini, L.; Béky, B.; Csubry, Z.; Buchhave, L.; Henning, T.; Nikolov, N.; Csák, B.; Brahm, R.; Espinoza, N.; Conroy, P.; Noyes, R. W.; Sasselov, D. D.; Schmidt, B.; Wright, D. J.; Tinney, C. G.; Addison, B. C.; Lázár, J.; Papp, I.; Sári, P.

    2013-01-01

    We report the discovery of HATS-1b, a transiting extrasolar planet orbiting the moderately bright V = 12.05 G dwarf star GSC 6652-00186, and the first planet discovered by HATSouth, a global network of autonomous wide-field telescopes. HATS-1b has a period of P ≈ 3.4465 days, mass of Mp ≈ 1.86 M J, and radius of Rp ≈ 1.30 R J. The host star has a mass of 0.99 M ⊙ and radius of 1.04 R ⊙. The discovery light curve of HATS-1b has near-continuous coverage over several multi-day timespans, demonstrating the power of using a global network of telescopes to discover transiting planets. The HATSouth network is operated by a collaboration consisting of Princeton University (PU), the Max Planck Institute für Astronomie (MPIA), and the Australian National University (ANU). The station at Las Campanas Observatory (LCO) of the Carnegie Institute, is operated by PU in conjunction with collaborators at the Pontificia Universidad Católica de Chile (PUC), the station at the High Energy Spectroscopic Survey (HESS) site is operated in conjunction with MPIA, and the station at Siding Spring Observatory (SSO) is operated jointly with ANU. Based in part on observations made with the Nordic Optical Telescope, operated on the island of La Palma in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. Based on observations made with the MPG/ESO 2.2 m Telescope at the ESO Observatory in La Silla. FEROS ID programmes: P087.A-9014(A), P088.A-9008(A), P089.A-9008(A), P087.C-0508(A). GROND ID programme: 089.A-9006(A). This paper uses observations obtained with facilities of the Las Cumbres Observatory Global Telescope.

  8. HATS-18b: An Extreme Short-period Massive Transiting Planet Spinning Up Its Star

    NASA Astrophysics Data System (ADS)

    Penev, K.; Hartman, J. D.; Bakos, G. Á.; Ciceri, S.; Brahm, R.; Bayliss, D.; Bento, J.; Jordán, A.; Csubry, Z.; Bhatti, W.; de Val-Borro, M.; Espinoza, N.; Zhou, G.; Mancini, L.; Rabus, M.; Suc, V.; Henning, T.; Schmidt, B.; Noyes, R. W.; Lázár, J.; Papp, I.; Sári, P.

    2016-11-01

    We report the discovery by the HATSouth network of HATS-18b: a 1.980+/- 0.077 {M}{{J}}, {1.337}-0.049+0.102 {R}{{J}} planet in a 0.8378 day orbit, around a solar analog star (mass 1.037+/- 0.047 {M}⊙ and radius {1.020}-0.031+0.057 {R}⊙ ) with V=14.067+/- 0.040 mag. The high planet mass, combined with its short orbital period, implies strong tidal coupling between the planetary orbit and the star. In fact, given its inferred age, HATS-18 shows evidence of significant tidal spin up, which together with WASP-19 (a very similar system) allows us to constrain the tidal quality factor for Sun-like stars to be in the range of 6.5≲ {{log}}10({Q}* /{k}2)≲ 7 even after allowing for extremely pessimistic model uncertainties. In addition, the HATS-18 system is among the best systems (and often the best system) for testing a multitude of star-planet interactions, be they gravitational, magnetic, or radiative, as well as planet formation and migration theories. The HATSouth network is operated by a collaboration consisting of Princeton University (PU), the Max Planck Institute für Astronomie (MPIA), the Australian National University (ANU), and the Pontificia Universidad Católica de Chile (PUC). The station at Las Campanas Observatory (LCO) of the Carnegie Institute is operated by PU in conjunction with PUC, the station at the High Energy Spectroscopic Survey (H.E.S.S.) site is operated in conjunction with MPIA, and the station at Siding Spring Observatory (SSO) is operated jointly with ANU. This paper includes data gathered with the MPG 2.2 m telescope at the ESO Observatory in La Silla. This paper uses observations obtained with facilities of the Las Cumbres Observatory Global Telescope.

  9. The Wide Field Spectrograph (WiFeS)

    NASA Astrophysics Data System (ADS)

    Dopita, Michael; Hart, John; McGregor, Peter; Oates, Patrick; Bloxham, Gabe; Jones, Damien

    2007-08-01

    This paper describes the Wide Field Spectrograph (WiFeS) under construction at the Research School of Astronomy and Astrophysics (RSAA) of the Australian National University (ANU) for the ANU 2.3 m telescope at the Siding Spring Observatory. WiFeS is a powerful integral field, double-beam, concentric, image-slicing spectrograph designed to deliver excellent throughput, wavelength stability, spectrophotometric performance and superb image quality along with wide spectral coverage throughout the 320 950 nm wavelength region. It provides a 25×38 arcsec field with 0.5 arcsec sampling along each of twenty five 38×1 arcsec slitlets. The output format is optimized to match the 4096×4096 pixel CCD detectors in each of two cameras individually optimized for the blue and the red ends of the spectrum, respectively. A process of “interleaved nod-and-shuffle” will be applied to permit quantum noise-limited sky subtraction. Using VPH gratings, spectral resolutions of 3000 and 7000 are provided. The full spectral range is covered in a single exposure at R=3000, and in two exposures in the R=7000 mode. The use of transmissive coated optics, VPH gratings and optimized mirror coatings ensures a throughput (including telescope atmosphere and detector) >30% over a wide spectral range. The concentric image-slicer design ensures an excellent and uniform image quality across the full field. To maximize scientific return, the whole instrument is configured for remote observing, pipeline data reduction, and the accumulation of calibration image libraries.

  10. WiFeS: the wide field spectrograph

    NASA Astrophysics Data System (ADS)

    Dopita, Michael A.; Waldron, Liam E.; McGregor, Peter; Conroy, Peter; Doolan, Matthew C.; Zhelem, Ross; Bloxham, Gabe; Saunders, Will; Jones, Damien; Pfitzner, Lee

    2004-09-01

    WiFeS is a powerful integral field, double-beam, concentric, image-slicing spectrograph designed to deliver excellent thoughput, precision spectrophotometric performance and superb image quality along with wide spectral coverage throughout the 320-1000 nm wavelength region. It is currently under construction at the Research School of Astronomy and Astrophysics of the Australian National University (ANU), and will be mounted on the ANU 2.3m telescope at Siding Spring Observatory. It will provide a 25x31 arc sec field with 0.5 arc sec sampling along each of twenty five 31x1.0 arc sec slitlets. The output format is arranged to match the 4096x4096 pixel CCD detectors in each of two cameras individually optimized for the blue and the red ends of the spectrum, respectively. A process of "interleaved nod-and-shuffle" will be applied to permit quantum noise-limited sky subtraction. Using VPH gratings, spectral resolutions modes of 3000 and 7000 will be provided. The full spectral range is covered in a single exposure in the R=3000 mode, and in two exposures in the R=7000 mode. The use of transmissive coated optics, VPH gratings and optimized mirror coatings ensures a throughput (including telescope and atmosphere) that peaks above 30%. The concentric image-slicer design ensures an excellent and uniform image quality across the full field. To maximize the scientific return, the whole instrument is configured for remote observing, pipeline data reduction, and the accumulation of calibration image libraries.

  11. Development of Solar Powered Feeding Scheme for Wireless Sensor Networks in low Solar Density Conditions / Bezvadu Sensoru Tīklu Elektroapgādes Sistēmas Izstrāde, Kas Izmanto Saules Paneļus Un Darbojas Pazeminātas Saules Radiācijas Apstākļos

    NASA Astrophysics Data System (ADS)

    Kondratjevs, K.; Zabasta, A.; Selmanovs-Pless, V.

    2015-08-01

    In the recent years, there has been significant research focus on the safety and reliability of data harvesting and optimal energy consuming by wireless sensor network nodes. If external electrical power fails, the node needs to be able to send notifications to the utility demanding the use of backup energy strategies. The authors of the research offer an approach that can help to use PV panels as an alternative power source for WSN nodes in particular irradiation conditions. Survey and testing of the main types of PV panels offered on the market in conditions closed to real ones, in which WSN nodes are maintained, have been implemented. Based on the test results, maximum power control module parameters can be calculated in order to achieve the best effectiveness of the power control system for a selected type of PV panel or panel group. The novelty of the research is an approach that includes an original test bed design for PV testing, PV testing method and selection of design and MPP control module parameters, which ensure maximum effectiveness of WSN node power feeding. Pēdējos gados vairāki pētījumi ir veltīti problēmām, kas ir saistītas ar enerģijas patēriņa mazināšanu un efektīvu izmantošanu bezvadu sensoru tīklu mezglos. Kad sensors mezgls ir izsmēlis enerģijas krājumu, tas vairs nefunkcionē un atslēdzas no kopēja tīkla, kas var būtiski ietekmēt visa tīkla veiktspēju. Šī pētījuma mērķis ir izveidot barošanas vadības moduli, lai nodrošinātu stabilu elektroapgādes spriegumu autonomi strādājošiem radio signāla atkārtotājiem, sensoriem vai vārtejām, kas darbojas bezvadu sensoru tīklos. Pētījuma ietvaros izstrādāta metode saules paneļu kvalitatīvai salīdzināšanai starp tehnoloģijām vai savā starpā, izvērtējot to atbilstību mērķa pielietojumam. Izstrādātā metode sniedz iespēju veikt kontrolētus testus pie variējošiem, simulētiem gaismas apstākļiem, ļauj prognozēt enerģijas resursus

  12. HATS-25b through HATS-30b: A Half-dozen New Inflated Transiting Hot Jupiters from the HATSouth Survey

    NASA Astrophysics Data System (ADS)

    Espinoza, N.; Bayliss, D.; Hartman, J. D.; Bakos, G. Á.; Jordán, A.; Zhou, G.; Mancini, L.; Brahm, R.; Ciceri, S.; Bhatti, W.; Csubry, Z.; Rabus, M.; Penev, K.; Bento, J.; de Val-Borro, M.; Henning, T.; Schmidt, B.; Suc, V.; Wright, D. J.; Tinney, C. G.; Tan, T. G.; Noyes, R.

    2016-10-01

    We report six new inflated hot Jupiters (HATS-25b through HATS-30b) discovered using the HATSouth global network of automated telescopes. The planets orbit stars with V magnitudes in the range of ˜12-14 and have masses in the largely populated 0.5{M}J{--}0.7{M}J region of parameter space but span a wide variety of radii, from 1.17{R}J to 1.75{R}J. HATS-25b, HATS-28b, HATS-29b, and HATS-30b are typical inflated hot Jupiters ({R}p=1.17{--}1.26{R}J) orbiting G-type stars in short period (P = 3.2-4.6 days) orbits. However, HATS-26b ({R}p=1.75{R}J, P=3.3024 days) and HATS-27b ({R}p=1.50{R}J, P=4.6370 days) stand out as highly inflated planets orbiting slightly evolved F stars just after and in the turn-off points, respectively, which are among the least dense hot Jupiters, with densities of 0.153 {{g}} {{cm}}-3 and 0.180 {{g}} {{cm}}-3, respectively. All the presented exoplanets but HATS-27b are good targets for future atmospheric characterization studies, while HATS-27b is a prime target for Rossiter—McLaughlin monitoring in order to determine its spin-orbit alignment given the brightness (V = 12.8) and stellar rotational velocity (v\\sin i≈ 9.3 km s-1) of the host star. These discoveries significantly increase the number of inflated hot Jupiters known, contributing to our understanding of the mechanism(s) responsible for hot Jupiter inflation. The HATSouth network is operated by a collaboration consisting of Princeton University (PU), the Max Planck Institute für Astronomie (MPIA), the Australian National University (ANU), and the Pontificia Universidad Católica de Chile (PUC). The station at Las Campanas Observatory (LCO) of the Carnegie Institute is operated by PU in conjunction with PUC, the station at the High Energy Spectroscopic Survey (H.E.S.S.) site is operated in conjunction with MPIA, and the station at Siding Spring Observatory (SSO) is operated jointly with ANU. Based in part on observations made with the MPG 2.2 m Telescope at the ESO Observatory

  13. An assessment of the ICE6G_C (VM5A) glacial isostatic adjustment model

    NASA Astrophysics Data System (ADS)

    Purcell, Anthony; Tregoning, Paul; Dehecq, Amaury

    2016-04-01

    The recent release of the next-generation global ice history model, ICE6G_C(VM5a) [Peltier et al., 2015, Argus et al. 2014] is likely to be of interest to a wide range of disciplines including oceanography (sea level studies), space gravity (mass balance studies), glaciology and, of course, geodynamics (Earth rheology studies). In this presentation I will assess some aspects of the ICE6G_C(VM5a) model and the accompanying published data sets. I will demonstrate that the published present-day radial uplift rates are too high along the eastern side of the Antarctic Peninsula (by ˜8.6 mm/yr) and beneath the Ross Ice Shelf (by ˜5 mm/yr). Further, the published spherical harmonic coefficients - which are meant to represent the dimensionless present-day changes due to glacial isostatic adjustment (GIA) - will be shown to contain excessive power for degree ≥ 90, to be physically implausible and to not represent accurately the ICE6G_C(VM5a) model. The excessive power in the high degree terms produces erroneous uplift rates when the empirical relationship of Purcell et al. [2011] is applied but, when correct Stokes' coefficients are used, the empirical relationship will be shown to produce excellent agreement with the fully rigorous computation of the radial velocity field, subject to the caveats first noted by Purcell et al. [2011]. Finally, a global radial velocity field for the present-day GIA signal, and corresponding Stoke's coefficients will be presented for the ICE6GC ice model history using the VM5a rheology model. These results have been obtained using the ANU group's CALSEA software package and can be used to correct satellite altimetry observations for GIA over oceans and by the space gravity community to separate GIA and present-day mass balance change signals without any of the shortcomings of the previously published data-sets. We denote the new data sets ICE6G_ANU.

  14. HATS-15b and HATS-16b: Two Massive Planets Transiting Old G Dwarf Stars

    NASA Astrophysics Data System (ADS)

    Ciceri, S.; Mancini, L.; Henning, T.; Bakos, G.; Penev, K.; Brahm, R.; Zhou, G.; Hartman, J. D.; Bayliss, D.; Jordán, A.; Csubry, Z.; de Val-Borro, M.; Bhatti, W.; Rabus, M.; Espinoza, N.; Suc, V.; Schmidt, B.; Noyes, R.; Howard, A. W.; Fulton, B. J.; Isaacson, H.; Marcy, G. W.; Butler, R. P.; Arriagada, P.; Crane, J. D.; Shectman, S.; Thompson, I.; Tan, T. G.; Lázár, J.; Papp, I.; Sari, P.

    2016-07-01

    We report the discovery of HATS-15 b and HATS-16 b, two massive transiting extrasolar planets orbiting evolved (∼10 Gyr) main-sequence stars. The planet HATS-15 b, which is hosted by a G9 V star (V=14.8 mag), is a hot Jupiter with mass of 2.17\\quad +/- \\quad 0.15 {M}{{J}} and radius of 1.105\\quad +/- \\quad 0.040 {R}{{J}}, and it completes its orbit in about 1.7 days. HATS-16 b is a very massive hot Jupiter with mass of 3.27\\quad +/- \\quad 0.19 {M}{{J}} and radius of 1.30\\quad +/- \\quad 0.15 {R}{{J}}; it orbits around its G3 V parent star (V=13.8 mag) in ∼2.7 days. HATS-16 is slightly active and shows a periodic photometric modulation, implying a rotational period of 12 days, which is unexpectedly short given its isochronal age. This fast rotation might be the result of the tidal interaction between the star and its planet. The HATSouth network is operated by a collaboration consisting of Princeton University (PU), the Max Planck Institute für Astronomie (MPIA), the Australian National University (ANU), and the Pontificia Universidad Católica de Chile (PUC). The station at Las Campanas Observatory (LCO) of the Carnegie Institute is operated by PU in conjunction with PUC, the station at the High Energy Spectroscopic Survey (H.E.S.S.) site is operated in conjunction with MPIA, and the station at Siding Spring Observatory (SSO) is operated jointly with ANU. Based in part on observations performed at the ESO La Silla Observatory in Chile, with the Coralie and FEROS spectrographs mounted on the Euler-Swiss and MPG 2.2 m telescopes, respectively. This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. Based in part on data collected at Keck Telescope. Observations obtained with facilities of the Las Cumbres Observatory Global Telescope are used in this paper.

  15. HATS-8b: A Low-density Transiting Super-Neptune

    NASA Astrophysics Data System (ADS)

    Bayliss, D.; Hartman, J. D.; Bakos, G. Á.; Penev, K.; Zhou, G.; Brahm, R.; Rabus, M.; Jordán, A.; Mancini, L.; de Val-Borro, M.; Bhatti, W.; Espinoza, N.; Csubry, Z.; Howard, A. W.; Fulton, B. J.; Buchhave, L. A.; Henning, T.; Schmidt, B.; Ciceri, S.; Noyes, R. W.; Isaacson, H.; Marcy, G. W.; Suc, V.; Lázár, J.; Papp, I.; Sári, P.

    2015-08-01

    HATS-8b is a low density transiting super-Neptune discovered as part of the HATSouth project. The planet orbits its solar-like G-dwarf host (V = 14.03+/- 0.10, {T}{eff} = 5679+/- 50 K) with a period of 3.5839 days. HATS-8b is the third lowest-mass transiting exoplanet to be discovered from a wide-field ground-based search, and with a mass of 0.138+/- 0.019 {M}{{J}} it is approximately halfway between the masses of Neptune and Saturn. However, HATS-8b has a radius of {0.873}-0.075+0.123 {R}{{J}}, resulting in a bulk density of just 0.259+/- 0.091 {{g}} {{cm}}-3. The metallicity of the host star is super-solar ([{Fe}/{{H}}] = 0.210+/- 0.080), providing evidence against the idea that low-density exoplanets form from metal-poor environments. The low density and large radius of HATS-8b results in an atmospheric scale height of almost 1000 km, and in addition to this there is an excellent reference star of nearly equal magnitude at just 19″ separation in the sky. These factors make HATS-8b an exciting target for future atmospheric characterization studies, particularly for long-slit transmission spectroscopy. The HATSouth network is operated by a collaboration consisting of Princeton University (PU), the Max Planck Institute für Astronomie (MPIA), the Australian National University (ANU), and the Pontificia Universidad Católica de Chile (PUC). The station at Las Campanas Observatory (LCO) of the Carnegie Institute is operated by PU in conjunction with PUC, the station at the High Energy Spectroscopic Survey site is operated in conjunction with MPIA, and the station at Siding Spring Observatory is operated jointly with ANU. This paper includes data gathered with the 6.5 m Magellan Telescopes located in LCO, Chile. The work is based in part on observations made with the MPG 2.2 m Telescope and the ESO 3.6 m Telescope at the ESO Observatory in La Silla. This paper uses observations obtained using the facilities of the Las Cumbres Observatory Global Telescope.

  16. HATS9-b and HATS10-b: Two Compact Hot Jupiters in Field 7 of the K2 Mission

    NASA Astrophysics Data System (ADS)

    Brahm, R.; Jordán, A.; Hartman, J. D.; Bakos, G. Á.; Bayliss, D.; Penev, K.; Zhou, G.; Ciceri, S.; Rabus, M.; Espinoza, N.; Mancini, L.; de Val-Borro, M.; Bhatti, W.; Sato, B.; Tan, T. G.; Csubry, Z.; Buchhave, L.; Henning, T.; Schmidt, B.; Suc, V.; Noyes, R. W.; Papp, I.; Lázár, J.; Sári, P.

    2015-07-01

    We report the discovery of two transiting extrasolar planets by the HATSouth survey. HATS-9b orbits an old (10.8 ± 1.5 Gyr) V = 13.3 G dwarf star with a period P≈ 1.9153 days. The host star has a mass of 1.03 {M}⊙ , radius of 1.503 {R}⊙ , and effective temperature 5366 ± 70 K. The planetary companion has a mass of 0.837 {M}{{J}} and radius of 1.065 {R}{{J}}, yielding a mean density of 0.85 {{g}} {{cm}}-3. HATS-10b orbits a V = 13.1 G dwarf star with a period P≈ 3.3128 days. The host star has a mass of 1.1 {M}⊙ , radius of 1.11 {R}⊙ , and effective temperature 5880 ± 120 K. The planetary companion has a mass of 0.53 {M}{{J}} and radius of 0.97 {R}{{J}}, yielding a mean density of 0.7 {{g}} {{cm}}-3. Both planets are compact in comparison with planets receiving similar irradiation from their host stars and lie in the nominal coordinates of Field 7 of K2, but only HATS-9b falls on working silicon. Future characterization of HATS-9b with the exquisite photometric precision of the Kepler telescope may provide measurements of its reflected light signature. The HATSouth network is operated by a collaboration consisting of Princeton University (PU), the Max Planck Institute for Astronomy (MPIA), the Australian National University (ANU), and the Pontificia Universidad Católica de Chile (PUC). The station at Las Campanas Observatory (LCO) of the Carnegie Institute is operated by PU in conjunction with PUC, the station at the High Energy Spectroscopic Survey (H.E.S.S.) site is operated in conjunction with MPIA, and the station at Siding Spring Observatory (SSO) is operated jointly with ANU. Based in part on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan. Based in part on observations made with the MPG 2.2 m Telescope at the ESO Observatory in La Silla. This paper uses observations obtained with facilities of the Las Cumbres Observatory Global Telescope. Based on observations obtained with the Apache

  17. HATS-13b and HATS-14b: two transiting hot Jupiters from the HATSouth survey

    NASA Astrophysics Data System (ADS)

    Mancini, L.; Hartman, J. D.; Penev, K.; Bakos, G. Á.; Brahm, R.; Ciceri, S.; Henning, Th.; Csubry, Z.; Bayliss, D.; Zhou, G.; Rabus, M.; de Val-Borro, M.; Espinoza, N.; Jordán, A.; Suc, V.; Bhatti, W.; Schmidt, B.; Sato, B.; Tan, T. G.; Wright, D. J.; Tinney, C. G.; Addison, B. C.; Noyes, R. W.; Lázár, J.; Papp, I.; Sári, P.

    2015-08-01

    We report the discovery of HATS-13b and HATS-14b, which are two hot-Jupiter transiting planets discovered by the HATSouth survey. The host stars are quite similar to each other (HATS-13: V = 13.9 mag, M⋆ = 0.96 M⊙, R⋆ = 0.89 R⊙, Teff ≈ 5500 K, [Fe/H] = 0.05; HATS-14: V = 13.8 mag, M⋆ = 0.97 M⊙, R⋆ = 0.93 R⊙, Teff ≈ 5350 K, [Fe/H] = 0.33) and both the planets orbit around them with a period of ~3 days and a separation of ~0.04 au. However, even though they are irradiated in a similar way, the physical characteristics of the two planets are very different. HATS-13b, with a mass of Mp = 0.543 ± 0.072 MJ and a radius of Rp = 1.212 ± 0.035 RJ, appears as an inflated planet, while HATS-14b, having a mass of Mp = 1.071 ± 0.070 MJ and a radius of Rp = 1.039 ± 0.032 RJ, is only slightly larger in radius than Jupiter. The HATSouth network is operated by a collaboration consisting of Princeton University (PU), the Max Planck Institute für Astronomie (MPIA), the Australian National University (ANU), and the Pontificia Universidad Católica de Chile (PUC). The station at Las Campanas Observatory (LCO) of the Carnegie Institute is operated by PU in conjunction with PUC, the station at the High Energy Spectroscopic Survey (HESS) site is operated in conjunction with MPIA, and the station at Siding Spring Observatory (SSO) is operated jointly with ANU. Based in part on observations made with (i) the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan; (ii) the MPG 2.2 m and the (iii) Euler 1.2 m Telescopes at the ESO Observatory in La Silla; (iv) the CTIO 0.9 m Telescope at the Observatory of Cerro Tololo.Appendix A is available in electronic form at http://www.aanda.orgFull Table A.1 and RV Tables are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/580/A63

  18. HATS-4b: A Dense Hot Jupiter Transiting a Super Metal-rich G star

    NASA Astrophysics Data System (ADS)

    Jordán, Andrés; Brahm, Rafael; Bakos, G. Á.; Bayliss, D.; Penev, K.; Hartman, J. D.; Zhou, G.; Mancini, L.; Mohler-Fischer, M.; Ciceri, S.; Sato, B.; Csubry, Z.; Rabus, M.; Suc, V.; Espinoza, N.; Bhatti, W.; de Val-Borro, M.; Buchhave, L.; Csák, B.; Henning, T.; Schmidt, B.; Tan, T. G.; Noyes, R. W.; Béky, B.; Butler, R. P.; Shectman, S.; Crane, J.; Thompson, I.; Williams, A.; Martin, R.; Contreras, C.; Lázár, J.; Papp, I.; Sári, P.

    2014-08-01

    We report the discovery by the HATSouth survey of HATS-4b, an extrasolar planet transiting a V = 13.46 mag G star. HATS-4b has a period of P ≈ 2.5167 days, mass of Mp ≈ 1.32 M Jup, radius of Rp ≈ 1.02 R Jup, and density of ρ p = 1.55 ± 0.16 g cm-3 ≈1.24 ρJup. The host star has a mass of 1.00 M ⊙, a radius of 0.92 R ⊙, and a very high metallicity [Fe/H]=0.43 ± 0.08. HATS-4b is among the densest known planets with masses between 1 and 2 M J and is thus likely to have a significant content of heavy elements of the order of 75 M ⊕. In this paper we present the data reduction, radial velocity measurements, and stellar classification techniques adopted by the HATSouth survey for the CORALIE spectrograph. We also detail a technique for simultaneously estimating vsin i and macroturbulence using high resolution spectra. The HATSouth network is operated by a collaboration consisting of Princeton University (PU), the Max Planck Institut für Astronomie (MPIA), and the Australian National University (ANU). The station at Las Campanas Observatory (LCO) of the Carnegie Institution is operated by PU in conjunction with collaborators at the Pontificia Universidad Católica de Chile, the station at the High Energy Spectroscopic Survey site is operated in conjunction with MPIA, and the station at Siding Spring Observatory (SSO) is operated jointly with ANU. This paper includes data gathered with the 6.5 m Magellan Telescopes located at LCO, Chile. Based in part on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan, and on observations made with the MPG/ESO 2.2 m Telescope at the ESO Observatory in La Silla. This paper uses observations obtained with facilities of the Las Cumbres Observatory Global Telescope.

  19. HATS-17b: A Transiting Compact Warm Jupiter in a 16.3 Day Circular Orbit

    NASA Astrophysics Data System (ADS)

    Brahm, R.; Jordán, A.; Bakos, G. Á.; Penev, K.; Espinoza, N.; Rabus, M.; Hartman, J. D.; Bayliss, D.; Ciceri, S.; Zhou, G.; Mancini, L.; Tan, T. G.; de Val-Borro, M.; Bhatti, W.; Csubry, Z.; Bento, J.; Henning, T.; Schmidt, B.; Rojas, F.; Suc, V.; Lázár, J.; Papp, I.; Sári, P.

    2016-04-01

    We report the discovery of HATS-17b, the first transiting warm Jupiter of the HATSouth network. HATS-17b transits its bright (V = 12.4) G-type ({M}\\star = 1.131+/- 0.030 {M}⊙ , {R}\\star = {1.091}-0.046+0.070 {R}⊙ ) metal-rich ([Fe/H] = +0.3 dex) host star in a circular orbit with a period of P = 16.2546 days. HATS-17b has a very compact radius of 0.777+/- 0.056 {R}{{J}} given its Jupiter-like mass of 1.338+/- 0.065 {M}{{J}}. Up to 50% of the mass of HATS-17b may be composed of heavy elements in order to explain its high density with current models of planetary structure. HATS-17b is the longest period transiting planet discovered to date by a ground-based photometric survey, and is one of the brightest transiting warm Jupiter systems known. The brightness of HATS-17 will allow detailed follow-up observations to characterize the orbital geometry of the system and the atmosphere of the planet. The HATSouth network is operated by a collaboration consisting of Princeton University (PU), the Max Planck Institute für Astronomie (MPIA), the Australian National University (ANU), and the Pontificia Universidad Católica de Chile (PUC). The station at Las Campanas Observatory (LCO) of the Carnegie Institute is operated by PU in conjunction with PUC, the station at the High Energy Spectroscopic Survey (H.E.S.S.) site is operated in conjunction with MPIA, and the station at Siding Spring Observatory (SSO) is operated jointly with ANU. This paper includes data gathered with the MPG 2.2 m telescope at the ESO Observatory in La Silla and with the 3.9 m AAT in Siding Spring Observatory. This paper uses observations obtained with facilities of the Las Cumbres Observatory Global Telescope. Based on observations taken with the HARPS spectrograph (ESO 3.6 m telescope at La Silla) under programme 097.C-0571.

  20. Agronomic nitrogen-use efficiency of rice can be increased by driving OsNRT2.1 expression with the OsNAR2.1 promoter.

    PubMed

    Chen, Jingguang; Zhang, Yong; Tan, Yawen; Zhang, Min; Zhu, Longlong; Xu, Guohua; Fan, Xiaorong

    2016-08-01

    The importance of the nitrate (NO3-) transporter for yield and nitrogen-use efficiency (NUE) in rice was previously demonstrated using map-based cloning. In this study, we enhanced the expression of the OsNRT2.1 gene, which encodes a high-affinity NO3- transporter, using a ubiquitin (Ubi) promoter and the NO3--inducible promoter of the OsNAR2.1 gene to drive OsNRT2.1 expression in transgenic rice plants. Transgenic lines expressing pUbi:OsNRT2.1 or pOsNAR2.1:OsNRT2.1 constructs exhibited the increased total biomass including yields of approximately 21% and 38% compared with wild-type (WT) plants. The agricultural NUE (ANUE) of the pUbi:OsNRT2.1 lines decreased to 83% of that of the WT plants, while the ANUE of the pOsNAR2.1:OsNRT2.1 lines increased to 128% of that of the WT plants. The dry matter transfer into grain decreased by 68% in the pUbi:OsNRT2.1 lines and increased by 46% in the pOsNAR2.1:OsNRT2.1 lines relative to the WT. The expression of OsNRT2.1 in shoot and grain showed that Ubi enhanced OsNRT2.1 expression by 7.5-fold averagely and OsNAR2.1 promoters increased by about 80% higher than the WT. Interestingly, we found that the OsNAR2.1 was expressed higher in all the organs of pUbi:OsNRT2.1 lines; however, for pOsNAR2.1:OsNRT2.1 lines, OsNAR2.1 expression was only increased in root, leaf sheaths and internodes. We show that increased expression of OsNRT2.1, especially driven by OsNAR2.1 promoter, can improve the yield and NUE in rice.

  1. Collaboratively Architecting a Scalable and Adaptable Petascale Infrastructure to Support Transdisciplinary Scientific Research for the Australian Earth and Environmental Sciences

    NASA Astrophysics Data System (ADS)

    Wyborn, L. A.; Evans, B. J. K.; Pugh, T.; Lescinsky, D. T.; Foster, C.; Uhlherr, A.

    2014-12-01

    The National Computational Infrastructure (NCI) at the Australian National University (ANU) is a partnership between CSIRO, ANU, Bureau of Meteorology (BoM) and Geoscience Australia. Recent investments in a 1.2 PFlop Supercomputer (Raijin), ~ 20 PB data storage using Lustre filesystems and a 3000 core high performance cloud have created a hybrid platform for higher performance computing and data-intensive science to enable large scale earth and climate systems modelling and analysis. There are > 3000 users actively logging in and > 600 projects on the NCI system. Efficiently scaling and adapting data and software systems to petascale infrastructures requires the collaborative development of an architecture that is designed, programmed and operated to enable users to interactively invoke different forms of in-situ computation over complex and large scale data collections. NCI makes available major and long tail data collections from both the government and research sectors based on six themes: 1) weather, climate and earth system science model simulations, 2) marine and earth observations, 3) geosciences, 4) terrestrial ecosystems, 5) water and hydrology and 6) astronomy, bio and social. Collectively they span the lithosphere, crust, biosphere, hydrosphere, troposphere, and stratosphere. Collections are the operational form for data management and access. Similar data types from individual custodians are managed cohesively. Use of international standards for discovery and interoperability allow complex interactions within and between the collections. This design facilitates a transdisciplinary approach to research and enables a shift from small scale, 'stove-piped' science efforts to large scale, collaborative systems science. This new and complex infrastructure requires a move to shared, globally trusted software frameworks that can be maintained and updated. Workflow engines become essential and need to integrate provenance, versioning, traceability, repeatability

  2. Inverting Glacial Isostatic Adjustment signal using Bayesian framework and two linearly relaxing rheologies

    NASA Astrophysics Data System (ADS)

    Caron, L.; Métivier, L.; Greff-Lefftz, M.; Fleitout, L.; Rouby, H.

    2017-02-01

    Glacial Isostatic Adjustment (GIA) models commonly assume a mantle with a viscoelastic Maxwell rheology and a fixed ice history model. Here, we use a Bayesian Monte Carlo approach with a Markov Chain formalism to invert the global GIA signal simultaneously for the mechanical properties of the mantle and the volumes of the ice sheets, using as starting ice models two previously published ice histories. Two stress relaxing rheologies are considered: Burgers and Maxwell linear viscoelasticities. A total of 5720 global paleo sea levels records are used, covering the last 35kyr. Our goal is not only to seek the model best fitting this data set, but also to determine and display the range of possible solutions with their respective probability of explaining the data. In all cases our a posteriori probability maps exhibit the classic character of solutions for GIA-determined mantle viscosity with two distinct peaks. What is new in our treatment is the presence of the bi-viscous Burgers rheology and the fact that we invert rheology jointly with ice history, in combination with the greatly expanded paleo sea level records. The solutions tend to be characterized by an upper mantle viscosity of around 5 × 1020Pa.s with one preferred lower mantle viscosities at 3 × 1021Pa.s and the other more than 2 × 1022Pa.s, a rather classical pairing. Best-fitting models depend upon the starting ice history and the stress relaxing law. A first peak (P1) has the highest probability only in the case with a Maxwell rheology and ice history based on ICE-5G, while the second peak (P2) is favoured for ANU-based ice history or Burgers stress relaxation. The latter solution also may satisfy lower mantle viscosity inferences from long-term geodynamics and gravity gradient anomalies over Laurentia. P2 is also consistent with large Laurentian and Fennoscandian ice-sheet volumes at the Last Glacial Maximum (LGM) and smaller LGM Antarctic ice volume than in either ICE-5G or ANU. Exploration of a bi

  3. HATS-11b AND HATS-12b: Two Transiting Hot Jupiters Orbiting Subsolar Metallicity Stars Selected for the K2 Campaign 7

    NASA Astrophysics Data System (ADS)

    Rabus, M.; Jordán, A.; Hartman, J. D.; Bakos, G. Á.; Espinoza, N.; Brahm, R.; Penev, K.; Ciceri, S.; Zhou, G.; Bayliss, D.; Mancini, L.; Bhatti, W.; de Val-Borro, M.; Csbury, Z.; Sato, B.; Tan, T.-G.; Henning, T.; Schmidt, B.; Bento, J.; Suc, V.; Noyes, R.; Lázár, J.; Papp, I.; Sári, P.

    2016-10-01

    We report the discovery of two transiting extrasolar planets from the HATSouth survey. HATS-11, a V = 14.1 G0-star shows a periodic 12.9 mmag dip in its light curve every 3.6192 days and a radial velocity variation consistent with a Keplerian orbit. HATS-11 has a mass of 1.000+/- 0.060 {M}⊙ , a radius of 1.444+/- 0.057 {R}⊙ and an effective temperature of 6060+/- 150 K, while its companion is a 0.85+/- 0.12 {M}{{J}}, 1.510+/- 0.078 {R}{{J}} planet in a circular orbit. HATS-12 shows a periodic 5.1 mmag flux decrease every 3.1428 days and Keplerian RV variations around a V = 12.8 F-star. HATS-12 has a mass of 1.489+/- 0.071 {M}⊙ , a radius of 2.21+/- 0.21 {R}⊙ , and an effective temperature of 6408+/- 75 K. For HATS-12b, our measurements indicate that this is a 2.38+/- 0.11 {M}{{J}}, 1.35+/- 0.17 {R}{{J}} planet in a circular orbit. Both host stars show subsolar metallicities of -0.390+/- 0.060 dex and -0.100+/- 0.040 dex, respectively, and are (slightly) evolved stars. In fact, HATS-11 is among the most metal-poor and, HATS-12, with a {log}{g}\\star of 3.923+/- 0.065, is among the most evolved stars hosting a hot-Jupiter planet. Importantly, HATS-11 and HATS-12 have been observed in long cadence by Kepler as part of K2 campaign 7 (EPIC216414930 and EPIC218131080 respectively). The HATSouth network is operated by a collaboration consisting of Princeton University (PU), the Max Planck Institute für Astronomie (MPIA), the Australian National University (ANU), and the Pontificia Universidad Católica de Chile (PUC). The station at Las Campanas Observatory (LCO) of the Carnegie Institute is operated by PU in conjunction with PUC, the station at the High Energy Spectroscopic Survey (H.E.S.S.) site is operated in conjunction with MPIA, and the station at Siding Spring Observatory (SSO) is operated jointly with ANU. Based in part on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan. Based in part on

  4. HATS-31b through HATS-35b: Five Transiting Hot Jupiters Discovered By the HATSouth Survey

    NASA Astrophysics Data System (ADS)

    de Val-Borro, M.; Bakos, G. Á.; Brahm, R.; Hartman, J. D.; Espinoza, N.; Penev, K.; Ciceri, S.; Jordán, A.; Bhatti, W.; Csubry, Z.; Bayliss, D.; Bento, J.; Zhou, G.; Rabus, M.; Mancini, L.; Henning, T.; Schmidt, B.; Tan, T. G.; Tinney, C. G.; Wright, D. J.; Kedziora-Chudczer, L.; Bailey, J.; Suc, V.; Durkan, S.; Lázár, J.; Papp, I.; Sári, P.

    2016-12-01

    We report the discovery of five new transiting hot-Jupiter planets discovered by the HATSouth survey, HATS-31b through HATS-35b. These planets orbit moderately bright stars with V magnitudes within the range of 11.9-14.4 mag while the planets span a range of masses of 0.88-1.22 {M}{{J}} and have somewhat inflated radii between 1.23 and 1.64 {R}{{J}}. These planets can be classified as typical hot Jupiters, with HATS-31b and HATS-35b being moderately inflated gas giant planets with radii of 1.64+/- 0.22 {R}{{J}} and {1.464}-0.044+0.069 {R}{{J}}, respectively, that can be used to constrain inflation mechanisms. All five systems present a higher Bayesian evidence for a fixed-circular-orbit model than for an eccentric orbit. The orbital periods range from 1.8209993+/- 0.0000016 day for HATS-35b) to 3.377960+/- 0.000012 day for HATS-31b. Additionally, HATS-35b orbits a relatively young F star with an age of 2.13+/- 0.51 Gyr. We discuss the analysis to derive the properties of these systems and compare them in the context of the sample of well-characterized transiting hot Jupiters known to date. The HATSouth network is operated by a collaboration consisting of Princeton University (PU), the Max Planck Institute für Astronomie (MPIA), the Australian National University (ANU), and the Pontificia Universidad Católica de Chile (PUC). The station at Las Campanas Observatory (LCO) of the Carnegie Institute is operated by PU in conjunction with PUC, the station at the High Energy Spectroscopic Survey (H.E.S.S.) site is operated in conjunction with MPIA, and the station at Siding Spring Observatory (SSO) is operated jointly with ANU. Based in part on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan. Based in part on observations made with the MPG 2.2 m and Euler1.2 m Telescopes at the ESO Observatory in La Silla. This paper uses observations obtained with facilities of the Las Cumbres Observatory Global Telescope.

  5. IC 630: Piercing the Veil of the Nuclear Gas

    NASA Astrophysics Data System (ADS)

    Durré, Mark; Mould, Jeremy; Schartmann, Marc; Ashraf Uddin, Syed; Cotter, Garrett

    2017-04-01

    IC 630 is a nearby early-type galaxy with a mass of 6× {10}10 M ⊙ with an intense burst of recent (6 Myr) star formation (SF). It shows strong nebular emission lines, with radio and X-ray emission, which classifies it as an active galactic nucleus (AGN). With VLT-SINFONI and Gemini North-NIFS adaptive optics observations (plus supplementary ANU 2.3 m WiFeS optical IFU observations), the excitation diagnostics of the nebular emission species show no sign of standard AGN engine excitation; the stellar velocity dispersion also indicates that a supermassive black hole (if one is present) is small ({M}\\bullet =2.25× {10}5 {M}ȯ ). The luminosity at all wavelengths is consistent with SF at a rate of about 1–2 M ⊙ yr‑1. We measure gas outflows driven by SF at a rate of 0.18 M ⊙ yr‑1 in a face-on truncated cone geometry. We also observe a nuclear cluster or disk and other clusters. Photoionization from young, hot stars is the main excitation mechanism for [Fe ii] and hydrogen, whereas shocks are responsible for the H2 excitation. Our observations are broadly comparable with simulations where a Toomre-unstable, self-gravitating gas disk triggers a burst of SF, peaking after about 30 Myr and possibly cycling with a period of about 200 Myr.

  6. Biological activity of phenylpropionic acid isolated from a terrestrial Streptomycetes.

    PubMed

    Narayana, Kolla J P; Prabhakar, Peddikotla; Vijayalakshmi, Muvva; Venkateswarlu, Yenamandra; Krishna, Palakodety S J

    2007-01-01

    The strain ANU 6277 was isolated from laterite soil and identified as Streptomyces sp. closely related to Streptomyces albidoflavus cluster by 16S rRNA analysis. The cultural, morphological and physiological characters of the strain were recorded. The strain exhibited resistance to chloramphenicol, penicillin and streptomycin. It had the ability to produce enzymes such as amylase and chitinase. A bioactive compound was isolated from the strain at stationary phase of culture and identified as 3-phenylpropionic acid (3-PPA) by FT-IR, EI-MS, 1H NMR and 13C NMR spectral studies. It exhibited antimicrobial activity against different bacteria like Bacillus cereus, B. subtilis, Escherichia coli, Klebsiella pneumoniae, Proteus vulgaris, Pseudomonas aeruginosa, P. flourescens, Staphylococcus aureus and some fungi including Aspergillus flavus, A. niger, Candida albicans, Fusarium oxysporum, F. udum and Penicillium citrinum. The antifungal activity of 3-PPA of the strain was evaluated in in vivo and in vitro conditions against Fusarium udum causing wilt disease in pigeon pea. The compound 3-PPA is an effective antifungal agent when compared to tricyclozole (fungicide) to control wilt caused by F. udum, but it exhibited less antifungal activity than carbendazim.

  7. Department of Defense (DoD) Acronym List II,

    DTIC Science & Technology

    1986-11-01

    0 Ln () ’I ’T ~-4 tD 4- 1 ot ’D - Ln. I. nu 14 "Q NQ-.- I -4 1 1 1 - r-C’ 1 C >Lfl) I sr- O-ANU I -I ~ a~4 r- I ;r Lf 00 4 o03-a’> N -zl C N O’ -4...OflI’ " %o , ,--4 w tD I’ k.0 w w > ,o I O 4 m w- fm 41 w m ww Z Z m w r w w w w w - 4 N 4,J 4J 4J 4J’ 4 Z .Z 4J Z N -- -- - 1 ------- a) 4J 0 En...a ) *.-i4 )~ - r4 E 4 .Q U) -r4 Q4 10-) -4 c~J W Q H u ) - U) (Cs 4 U) 4.) U) w a G; (U) tD -4- U 1) r 4 r >1 e 0 02)UU -4 C: W. -WU 4 -W44J-4 r4(1 a

  8. Time Reversed Electromagnetics as a Novel Method for Wireless Power Transfer

    NASA Astrophysics Data System (ADS)

    Challa, Anu; Anlage, Steven M.; Tesla Team

    Taking advantage of ray-chaotic enclosures, time reversal has been shown to securely transmit information via short-wavelength waves between two points, yielding noise at all other sites. In this presentation, we propose a method to adapt the signal-focusing technique to electromagnetic signals in order to transmit energy to portable devices. Relying only on the time-reversal invariance properties of waves, the technique is unencumbered by the inversely-proportional-to-distance path loss or precise orientation requirements of its predecessors, making it attractive for power transfer applications. We inject a short microwave pulse into a complex, wave-chaotic chamber and collect the resulting long time-domain signal at a designated transceiver. The signal is then time reversed and emitted from the collection site, collapsing as a time-reversed replica of the initial pulse at the injection site. When amplified, this reconstruction is robust, as measured through metrics of peak-to-peak voltage and energy transfer ratio. We experimentally demonstrate that time reversed collapse can be made on a moving target, and propose a way to selectively target devices through nonlinear time-reversal. University of Maryland Gemstone Team TESLA: Frank Cangialosi, Anu Challa, Tim Furman, Tyler Grover, Patrick Healey, Ben Philip, Brett Potter, Scott Roman, Andrew Simon, Liangcheng Tao, Alex Tabatabai.

  9. Nucleogenic 36Cl, 236U and 239Pu in uranium ores

    NASA Astrophysics Data System (ADS)

    Wilcken, K. M.; Fifield, L. K.; Barrows, T. T.; Tims, S. G.; Gladkis, L. G.

    2008-08-01

    The nucleogenic isotopes 36Cl, 236U and 239Pu are produced naturally in subsurface environments via neutron capture of thermal and epithermal neutrons. Concentrations are, however, very low and accelerator mass spectrometry (AMS) is required for quantitative measurements. A particular challenge is presented by the measurement of 236U/ 238U ratios down to the level of 10 -13 that is expected from rocks with low uranium concentration. Here, we present the AMS methodology that has been developed at the ANU for measuring 236U/ 238U ratios at this level. The more established methodologies for 36Cl and 239Pu measurements are also summarised. These capabilities are then used to characterize the 36Cl, 236U and 239Pu concentrations in a range of uranium ores. A simple model of the neutron production and capture processes in subsurface environments has been developed and is presented. It is shown that nucleogenic 36Cl, 236U and 239Pu can be used to determine both thermal and epithermal neutron fluxes in subsurface environments. Potential applications include uranium exploration and monitoring of the environmental impact of uranium mining.

  10. Characterization and symbiotic importance of acidic extracellular polysaccharides of Rhizobium sp. strain GRH2 isolated from acacia nodules.

    PubMed Central

    Lopez-Lara, I M; Orgambide, G; Dazzo, F B; Olivares, J; Toro, N

    1993-01-01

    Rhizobium sp. wild-type strain GRH2 was originally isolated from root nodules of the leguminous tree Acacia cyanophylla and has a broad host range which includes herbaceous legumes, e.g., Trifolium spp. We examined the extracellular exopolysaccharides (EPSs) produced by strain GRH2 and found three independent glycosidic structures: a high-molecular-weight acidic heteropolysaccharide which is very similar to the acidic EPS produced by Rhizobium leguminosarum biovar trifolii ANU843, a low-molecular-weight native heterooligosaccharide resembling a dimer of the repeat unit of the high-molecular-weight EPS, and low-molecular-weight neutral beta (1,2)-glucans. A Tn5 insertion mutant derivative of GRH2 (exo-57) that fails to form acidic heteropolysaccharides was obtained. This Exo- mutant formed nitrogen-fixing nodules on Acacia plants but infected a smaller proportion of cells in the central zone of the nodules than did wild-type GRH2. In addition, the exo-57 mutant failed to nodulate several herbaceous legume hosts that are nodulated by wild-type strain GRH2. Images PMID:8491702

  11. SkyMapper Early Data Release

    NASA Astrophysics Data System (ADS)

    Wolf, Christian; Onken, Christopher; Schmidt, Brian; Bessell, Michael; Da Costa, Gary; Luvaul, Lance; Mackey, Dougal; Murphy, Simon; White, Marc; SkyMapper Team

    2016-05-01

    The SkyMapper Early Data Release (EDR) is the initial data release from the SkyMapper Southern Survey, which aims to create a deep, multi-epoch, multi-band photometric data set for the entire southern sky. EDR covers approximately 6700 sq. deg. (one-third) of the southern sky as obtained by the Short Survey component of the project. All included fields have at least two visits in good conditions in all six SkyMapper filters (uvgriz). Object catalogues are complete to magnitude 17-18, depending on filter. IVOA-complaint table access protocol (TAP), cone search and simple image access protocol (SIAP) services are available from the SkyMapper website (http://skymapper.anu.edu.au/), as well as through tools such as TOPCAT. Data are restricted to Australian astronomers and their collaborators for twelve months from the release date. Further details on the reduction of SkyMapper data, along with data quality improvements, will be released in late 2016 as part of SkyMapper Data Release 1 (DR1).

  12. Quantum Cause of Gravity Waves and Dark Matter

    NASA Astrophysics Data System (ADS)

    Goradia, Shantilal; Goradia Team

    2016-09-01

    Per Einstein's theory mass tells space how to curve and space tells mass how to move. How do they tell''? The question boils down to information created by quantum particles blinking ON and OFF analogous to `Ying and Yang' or some more complex ways that may include dark matter. If not, what creates curvature of space-time? Consciousness, dark matter, quantum physics, uncertainty principle, constants of nature like strong coupling, fine structure constant, cosmological constant introduced by Einstein, information, gravitation etc. are fundamentally consequences of that ONE TOE. Vedic philosophers, who impressed Schrodinger so much, called it ATMA split in the categories of AnuAtma (particle soul), JivAtma (life soul) and ParamAtma (Omnipresent soul) which we relate to quantum physics, biology and cosmology. There is no separate TOE for any one thing. The long range relativistic propagations of the strong and weak couplings of the microscopic black holes in are just gravity waves. What else could they be?

  13. HAT-South: A Global Network of Southern Hemisphere Automated Telescopes to Detect Transiting Exoplanets

    NASA Astrophysics Data System (ADS)

    Bakos, G.; Afonso, C.; Henning, T.; Jordán, A.; Holman, M.; Noyes, R. W.; Sackett, P. D.; Sasselov, D.; Kovács, Gábor; Csubry, Z.; Pál, A.

    2009-02-01

    HAT-South is a network of six identical, fully automated wide field telescopes, to be located at three sites (Chile: Las Campanas, Australia: Siding Springs, and Namibia: HESS site) in the Southern hemisphere. The primary purpose of the network is to detect and characterize a large number of extra-solar planets transiting nearby bright stars, and to explore their diversity. Operation of HAT-South is a collaboration among the Harvard-Smithsonian Center for Astrophysics (CfA), Max Planck Institute for Astronomy (MPIA) and the Australian National University (ANU). The network is expected to be ready for initial science operations in 2009. The three sites will permit near round-the-clock monitoring of selected fields, and the continuous data-stream will greatly enhance recovery of transits. HAT-South will be sensitive to planetary transits down to R≈14 across a 128 square-degrees combined field of view, thereby targeting a large number of dwarfs with feasible confirmation-mode follow-up. We anticipate a yearly detection rate of approximately 25 planets transiting bright stars.

  14. Performance Comparison of SDN Solutions for Switching Dedicated Long-Haul Connections

    SciTech Connect

    Rao, Nageswara S

    2016-01-01

    We consider scenarios with two sites connected over a dedicated, long-haul connection that must quickly fail-over in response to degradations in host-to-host application performance. We present two methods for path fail-over using OpenFlowenabled switches: (a) a light-weight method that utilizes host scripts to monitor the application performance and dpctl API for switching, and (b) a generic method that uses two OpenDaylight (ODL) controllers and REST interfaces. The restoration dynamics of the application contain significant statistical variations due to the controllers, north interfaces and switches; in addition, the variety of vendor implementations further complicates the choice between different solutions. We present the impulse-response method to estimate the regressions of performance parameters, which enables a rigorous and objective comparison of different solutions. We describe testing results of the two methods, using TCP throughput and connection rtt as main parameters, over a testbed consisting of HP and Cisco switches connected over longhaul connections emulated in hardware by ANUE devices. The combination of analytical and experimental results demonstrates that dpctl method responds seconds faster than ODL method on average, while both methods restore TCP throughput.

  15. VizieR Online Data Catalog: New Miras in Galactic Bulge (Hummerich+ 2012)

    NASA Astrophysics Data System (ADS)

    Hummerich, S.; Bernhard, K.

    2013-01-01

    500 previously unrecorded Mira variables were found during an inspection of R-band lightcurves from the MACHO Galactic Bulge fields (http://macho.anu.edu.au/). This research continues the search for new Miras in the MACHO database (Bernhard, 2011PZP....11...12B). The MACHO 1.3m telescope is situated at Mount Stromlo in Australia and uses B and R filters in combination with eight 2048*2048 CCD cameras. Calculation of MACHO R magnitudes was done from the given instrumental R magnitudes using the formula given in Alcock et al. (1999PASP..111.1539A). Astrometric positions and near-infrared color indices were derived from the 2MASS catalog (Skrutskie et al. 2006, VII/233). Only objects with an amplitude >2mag (Rc) were taken into consideration. In addition, all lightcurves have been inspected visually; objects with significant changes in amplitude, mean magnitude and / or period suggesting semi-regularity have been rejected. Each object was checked against the Strasbourg CDS Vizier service and the International Variable Star Index (VSX) for pre-existence as a Mira-type star in variability catalogues. Summary data for all new Mira variables are listed in Table 1. (:) denotes uncertain value. Lightcurves, folded lightcurves and further details are available via AAVSO-VSX (http://www.aavso.org/vsx/). (1 data file).

  16. Subtle Interactions and Electron Transfer between U(III) , Np(III) , or Pu(III) and Uranyl Mediated by the Oxo Group.

    PubMed

    Arnold, Polly L; Dutkiewicz, Michał S; Zegke, Markus; Walter, Olaf; Apostolidis, Christos; Hollis, Emmalina; Pécharman, Anne-Fréderique; Magnani, Nicola; Griveau, Jean-Christophe; Colineau, Eric; Caciuffo, Roberto; Zhang, Xiaobin; Schreckenbach, Georg; Love, Jason B

    2016-10-04

    A dramatic difference in the ability of the reducing An(III) center in AnCp3 (An=U, Np, Pu; Cp=C5 H5 ) to oxo-bind and reduce the uranyl(VI) dication in the complex [(UO2 )(THF)(H2 L)] (L="Pacman" Schiff-base polypyrrolic macrocycle), is found and explained. These are the first selective functionalizations of the uranyl oxo by another actinide cation. At-first contradictory electronic structural data are explained by combining theory and experiment. Complete one-electron transfer from Cp3 U forms the U(IV) -uranyl(V) compound that behaves as a U(V) -localized single molecule magnet below 4 K. The extent of reduction by the Cp3 Np group upon oxo-coordination is much less, with a Np(III) -uranyl(VI) dative bond assigned. Solution NMR and NIR spectroscopy suggest Np(IV) U(V) but single-crystal X-ray diffraction and SQUID magnetometry suggest a Np(III) -U(VI) assignment. DFT-calculated Hirshfeld charge and spin density analyses suggest half an electron has transferred, and these explain the strongly shifted NMR spectra by spin density contributions at the hydrogen nuclei. The Pu(III) -U(VI) interaction is too weak to be observed in THF solvent, in agreement with calculated predictions.

  17. Hidden Variables and Placebo Effects

    NASA Astrophysics Data System (ADS)

    Goradia, Shantilal

    2006-03-01

    God's response to prayers and placebo leads to a question. How does He respond deterministically? He may be controlling at least one of the two variables of the uncertainty principle by extending His invisible soul to each body particle locally. Amazingly, many Vedic verses support this answer. One describes the size of the soul as arithmetically matching the size of the nucleons as if a particle is a soul. One gives a name meaning particle soul (anu-atma), consistent with particle's indeterministic behavior like that of (soulful) bird’s flying in any directions irrespective of the direction of throw. One describes souls as eternal consistent with the conservation of baryon number. One links the souls to the omnipresent (param- atma) like Einstein Rosen bridges link particles to normal spacetime. One claims eternal coexistence of matter and soul as is inflationary universe in physics/0210040 V2. The implicit scientific consistency of such verses makes the relationship of particle source of consciousness to the omnipresent Supreme analogous to the relationship of quantum source of gravitons in my gr-qc/0507130 to normal spacetime This frees us from the postulation of quantum wormholes and quantum foam. Dr. Hooft's view in ``Does God play dice,'' Physicsword, Dec 2005 seems consistent with my progressive conference presentations in Russia, Europe, India, and USA (Hindu University) in 2004/05. I see implications for nanoscience.

  18. Looking into the heart of a beast: The black hole binary LS 5039

    NASA Astrophysics Data System (ADS)

    Szalai, Tamas; Kiss, Laszlo L.; Sarty, Gordon E.

    2010-03-01

    LS 5039 is a relatively close microquasar consisting of a late O-type star and a compact object (very possibly a black hole) on a highly eccentric orbit with a period of 3.9 days. The high X-ray, gamma-ray and radio luminosity indicate light-matter interaction, which arise from the stellar wind of the primary star accreting toward the black hole. Former examinations suggest that LS 5039 could be a prototype of wind-fed high mass X-ray binaries (WXBs) with diskless main sequence O primaries. Now there is a great chance to better understand the configuration and the physical processes in the exotic system. In July 2009 LS 5039 was followed by the Canadian MOST space telescope to get ultraprecise photometric data in a month-long semi-continuous time series. Parallel to this, we have taken simultaneous high-resolution optical spectra using the 2.3m ANU telescope of the Siding Spring Observatory, supplemented with further data obtained in early August 2009 with the same instrument. Here we present the first results from the new echelle spectra, which represent the best optical spectroscopy ever obtained for this intriguing system. We determined fundamental orbital and physical parameters of LS 5039 and examined the configuration and the circumstellar environment of the system via radial velocity measurements and detailed line-profile analysis of H-Balmer, He I and He II lines.

  19. The early archaean crustal history of West Greenland as recorded by detrital zircons

    NASA Technical Reports Server (NTRS)

    Kinny, P. D.; Compston, W.; Mcgregor, V. R.

    1988-01-01

    The isotope systematics of some of the oldest samples on Earth from both Greenland and Australia was discussed. The antiquity was confirmed of the 4.1 to 4.2 Ga zircons from Western Australia; the model Lu-Hf age of these zircons, as measured with the ANU ion probe is 4.14 + or - 0.24 Ga, although the oldest preserved rock units there are anorthosites with a Lu-Hf model age of about 3.73 Ga. U-Pb ion probe ages of detrital zircons ranging between 2.87 and 3.89 Ga from an Akilia association quartzite was reported, whose age of deposition is probably around 3.8 Ga. It was argued that the younger age in this range are discordant because of late Pb-loss, probably associated with a high grade metamorphic event at about 3.6 Ga. It was also argued that the earliest crust in West Greenland and elsewhere is about 3.9 Ga, but in some places, such as Western Australia, crustal evolution took place much earlier, perhaps starting as far back as 4.3 Ga. This would account for the presence in that terrane of abundant K rich granitoid, the paucity of tonalitic and trondhjemitic materials, and the existence of Eu anomalies in early Archean sediments.

  20. PROBING THE PHYSICS OF NARROW LINE REGIONS IN ACTIVE GALAXIES. II. THE SIDING SPRING SOUTHERN SEYFERT SPECTROSCOPIC SNAPSHOT SURVEY (S7)

    SciTech Connect

    Dopita, Michael A.; Davies, Rebecca; Kewley, Lisa; Hampton, Elise; Sutherland, Ralph; Shastri, Prajval; Kharb, Preeti; Jose, Jessy; Bhatt, Harish; Ramya, S.; Scharwächter, Julia; Jin, Chichuan; Banfield, Julie; Zaw, Ingyin; Juneau, Stéphanie; Srivastava, Shweta

    2015-03-15

    Here we describe the Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7) and present results on 64 galaxies drawn from the first data release. The S7 uses the Wide Field Spectrograph mounted on the ANU 2.3 m telescope located at the Siding Spring Observatory to deliver an integral field of 38 × 25 arcsec at a spectral resolution of R = 7000 in the red (530–710 nm), and R = 3000 in the blue (340–560 nm). From these data cubes we have extracted the narrow-line region spectra from a 4 arcsec aperture centered on the nucleus. We also determine the Hβ and [O iii] λ5007 fluxes in the narrow lines, the nuclear reddening, the reddening-corrected relative intensities of the observed emission lines, and the Hβ and [O iii] λ5007 luminosities determined from spectra for which the stellar continuum has been removed. We present a set of images of the galaxies in [O iii] λ5007, [N ii] λ6584, and Hα, which serve to delineate the spatial extent of the extended narrow-line region and also to reveal the structure and morphology of the surrounding H ii regions. Finally, we provide a preliminary discussion of those Seyfert 1 and Seyfert 2 galaxies that display coronal emission lines in order to explore the origin of these lines.

  1. A numerical experiment on the equilibrium and stability of a rotating galactic bar

    NASA Technical Reports Server (NTRS)

    Miller, R. H.; Vandervoort, P. O.; Welty, D. E.; Smith, B. F.

    1982-01-01

    A self-consistent, three-dimensional numerical experiment is performed on an N-body system whose initial state is a realization of a certain theoretical model of a rotating triaxial galaxy. The model is a stellar-dynamical counterpart of a uniformly rotating polytrope of index equal to 0.5. The aim of the experiment is to study the equilibrium of the system and, in particular, to test its stability. The experimental system behaves in the mean like a realization of the theoretical model for at least seven crossing times. The principal departure of the system from equilibrium is an oscillation which is identified as a radial pulsation. There is no indication in its behavior that the system is unstable with respect to anu mode with an e-folding time shorter than or of the order of two crossing times. Certain changes that occur in the state of the system are interpreted, with the aid of the theoretical model, as secular changes which result from a slight failure of our numerical methods to conserve the mass, energy, and angular momentum of the system; these effects are small enough that they do not vitiate the experiment on a dynamical time scale.

  2. Operation of the “Small” BioAMS Spectrometers at CAMS: Past and Future Prospects

    PubMed Central

    Ognibene, T.J.; Haack, K.W.; Bench, G.; Brown, T.A.; Turteltaub, K.W.

    2015-01-01

    A summary of results from the solid samples run on our compact 1 MV AMS system over its 13.5 years of operation is presented. On average 7065 samples per year were measured with that average dropping to 3278 samples per year following the deployment of our liquid sample capability. Although the dynamic range of our spectrometer is 4.5 orders in magnitude, most of the measured graphitic samples had 14C/C concentrations between 0.1 and 1 modern. The measurements of our ANU sucrose standard followed a Gaussian distribution with an average of 1.5082 ± 0.0134 modern. The LLNL biomedical AMS program supported many different types of experiments, however, the large majority of samples measured were derived from animal model systems. We have transitioned all of our biomedical AMS measurements to the recently installed 250 kV SSAMS instrument with good agreement compared in measured 14C/C isotopic ratios between sample splits. Finally, we present results from replacement of argon stripping gas with helium in the SSAMS with a 22% improvement in ion transmission through the accelerator and high-energy analyzing magnet. PMID:26456990

  3. VINYLIDENE!

    NASA Astrophysics Data System (ADS)

    Gibson, Stephen; Laws, Benjamin; Suits, Arthur; Fernando, Ravin; Field, Robert W.

    2015-06-01

    In 1989 the Lineberger group observed S0 vinylidene in the negative ion photoelectron spectrum. Excess widths were interpreted by some as indicating a sub-picosecond lifetime for vinylidene. 1998 Coulomb explosion experiments showed that vinylidene character survives for at least 3.5 μs. Chirped Pulse mm-Wave spectra showed that 193 nm photolysis of Vinyl Cyanide produces many vibrational levels of HCN and HNC but no trace of vinylidene or local-bender excited acetylene. David Perry's and Michel Herman's effective Hamiltonian model for local-bender acetylene showed that IVR is complete at J approximately 100. Observation of long-lived vinylidene requires formation at low-J. Photodetachment of an electron from the Vinylidene negative ion deposits negligible angular momentum in the C2H2 moiety. The high-resolution negative-ion Photoelectron Velocity Map Imaging spectrometer at ANU reveals vinylidene with strongly vibration-dependent β asymmetry parameters. Infrared Multi-Photon Dissociation of Vinyl Chloride in the Wayne State Velocity Map Imaging spectrometer reveals rotationally and vibrationally cold HCl, presumably the 3-center photofragmentation co-product of rotationally cold vinylidene. The mechanism of vinylidene-acetylene isomerization is emerging...

  4. Uranium comparison by means of AMS and ICP-MS and Pu and 137Cs results around an Italian Nuclear Power Plant

    NASA Astrophysics Data System (ADS)

    De Cesare, M.; Tims, S. G.; Fifield, L. K.

    2015-04-01

    Italy built and commissioned 4 nuclear power plants between 1958-1978, which delivered a total of 1500 MW. All four were closed down after the Chernobyl accident following a referendum in 1987. One of the plants was Garigliano, commissioned in 1959. This plant used a 160 MW BWR1 (SEU of 2.3 %) and was operational from 1964 to 1979, when it was switched off for maintenance. It was definitively stopped in 1982, and is presently being decommissioned. We report here details on the chemistry procedure and on the measurements for soil samples, collected up to 4.5 km from the Nuclear Plant. A comparison between uranium (238U) concentration as determined by means of AMS (Accelerator Mass Spectrometry) and by ICP-MS (Inductively Coupled Plasma-Mass Spectrometry) techniques respectively at the ANU (Australian National University) and at the Ecowise company in Canberra, Australia, is reported, as well as 236U and 239;240Pu concentration results detected by AMS. 236U/238U and 240Pu/239Pu isotopic ratios by means of AMS are also provided. A contamination from Chernobyl is visible in the 137Cs/239+240Pu activity ratio measurements.

  5. Statistical Short-Range Guidance for Peak Wind Speed Forecasts on Kennedy Space Center/Cape Canaveral Air Force Station: Phase I Results

    NASA Technical Reports Server (NTRS)

    Lambert, Winifred C.; Merceret, Francis J. (Technical Monitor)

    2002-01-01

    This report describes the results of the ANU's (Applied Meteorology Unit) Short-Range Statistical Forecasting task for peak winds. The peak wind speeds are an important forecast element for the Space Shuttle and Expendable Launch Vehicle programs. The Keith Weather Squadron and the Spaceflight Meteorology Group indicate that peak winds are challenging to forecast. The Applied Meteorology Unit was tasked to develop tools that aid in short-range forecasts of peak winds at tower sites of operational interest. A 7 year record of wind tower data was used in the analysis. Hourly and directional climatologies by tower and month were developed to determine the seasonal behavior of the average and peak winds. In all climatologies, the average and peak wind speeds were highly variable in time. This indicated that the development of a peak wind forecasting tool would be difficult. Probability density functions (PDF) of peak wind speed were calculated to determine the distribution of peak speed with average speed. These provide forecasters with a means of determining the probability of meeting or exceeding a certain peak wind given an observed or forecast average speed. The climatologies and PDFs provide tools with which to make peak wind forecasts that are critical to safe operations.

  6. Rhizobium cellulase CelC2 is essential for primary symbiotic infection of legume host roots

    PubMed Central

    Robledo, M.; Jiménez-Zurdo, J. I.; Velázquez, E.; Trujillo, M. E.; Zurdo-Piñeiro, J. L.; Ramírez-Bahena, M. H.; Ramos, B.; Díaz-Mínguez, J. M.; Dazzo, F.; Martínez-Molina, E.; Mateos, P. F.

    2008-01-01

    The rhizobia–legume, root-nodule symbiosis provides the most efficient source of biologically fixed ammonia fertilizer for agricultural crops. Its development involves pathways of specificity, infectivity, and effectivity resulting from expressed traits of the bacterium and host plant. A key event of the infection process required for development of this root-nodule symbiosis is a highly localized, complete erosion of the plant cell wall through which the bacterial symbiont penetrates to establish a nitrogen-fixing, intracellular endosymbiotic state within the host. This process of wall degradation must be delicately balanced to avoid lysis and destruction of the host cell. Here, we describe the purification, biochemical characterization, molecular genetic analysis, biological activity, and symbiotic function of a cell-bound bacterial cellulase (CelC2) enzyme from Rhizobium leguminosarum bv. trifolii, the clover-nodulating endosymbiont. The purified enzyme can erode the noncrystalline tip of the white clover host root hair wall, making a localized hole of sufficient size to allow wild-type microsymbiont penetration. This CelC2 enzyme is not active on root hairs of the nonhost legume alfalfa. Microscopy analysis of the symbiotic phenotypes of the ANU843 wild type and CelC2 knockout mutant derivative revealed that this enzyme fulfils an essential role in the primary infection process required for development of the canonical nitrogen-fixing R. leguminosarum bv. trifolii-white clover symbiosis. PMID:18458328

  7. Multinational seismic investigation focuses on Rabaul volcano

    NASA Astrophysics Data System (ADS)

    Gudmundsson, O.; Johnson, R. W.; Finlayson, D. M.; Nishimura, Y.; Shimamura, H.; Terashima, A.; Itikarai, I.; Thurber, C.

    An improved disaster-reduction strategy for civil authorities and communities on the Gazelle Peninsula in Papua New Guinea is anticipated as a result of a multinational seismic investigation now under way there. Data collection has been completed but interpretation is at a preliminary stage. Volcanic eruptions in 1994 devastated the town of Rabaul and other communities on the peninsula.The investigation, known as the Rabaul Earthquake Location and Caldera Structure (RELACS) program, is building a seismic tomography image of the Rabaul volcano that will improve the precision with which volcano-related earthquakes can be located in real time. This will enable the Rabaul Volcanological Observatory (RVO) to interpret seismicity patterns in detail and provide better advice to civil authorities. Among other things, the scientific analytical capacity of RVO will be upgraded by improving knowledge about the subsurface structure of the caldera. Conducting the work are scientists from the Australian Geological Survey Organisation (AGSO), the Australian National University (ANU), the University of Hokkaido in Japan, and the University of Wisconsin (UW) in the United States.

  8. Contributions from radiation damping and surface scattering to the linewidth of the longitudinal plasmon band of gold nanorods: a single particle study.

    PubMed

    Novo, Carolina; Gomez, Daniel; Perez-Juste, Jorge; Zhang, Zhenyuan; Petrova, Hristina; Reismann, Maximilian; Mulvaney, Paul; Hartland, Gregory V

    2006-08-14

    The scattering spectra of single gold nanorods with aspect ratios between 2 and 4 have been examined by dark field microscopy. The results show that the longitudinal plasmon resonance (electron oscillation along the long axis of the rod) broadens as the width of the rods decreases from 14 to 8 nm. This is attributed to electron surface scattering. Analysis of the data using gamma = gamma(bulk) + Anu(F)/L(eff), where L(eff) is the effective path length of the electrons and nu(F) is the Fermi velocity, allows us to determine a value for the surface scattering parameter of A = 0.3. Larger rods with widths of 19 and 30 nm were also examined. These samples also show spectral broadening, which is attributed to radiation damping. The relative strengths of the surface scattering and radiation damping effects are in excellent agreement with recent work on spherical gold nanoparticles by Sönnichsen et al., Phys. Rev. Lett., 2002, 88, 077402; and by Berciaud et al., Nano Lett., 2005, 5, 515.

  9. Preparation of a multi-isotope plutonium AMS standard and preliminary results of a first inter-lab comparison

    NASA Astrophysics Data System (ADS)

    Dittmann, B.-A.; Dunai, T. J.; Dewald, A.; Heinze, S.; Feuerstein, C.; Strub, E.; Fifield, L. K.; Froehlich, M. B.; Tims, S. G.; Wallner, A.; Christl, M.

    2015-10-01

    The motivation of this work is to establish a new multi-isotope plutonium standard for isotopic ratio measurements with accelerator mass spectrometry (AMS), since stocks of existing solutions are declining. To this end, certified reference materials (CRMs) of each of the individual isotopes 239Pu, 240Pu, 242Pu and 244Pu were obtained from JRC IRMM (Joint Research Center Institute for Reference Materials and Measurements). These certified reference materials (IRMM-081a, IRMM-083, IRMM-043 and IRMM-042a) were diluted with nitric acid and mixed to obtain a stock standard solution with an isotopic ratio of approximately 1.0:1.0:1.0:0.1 (239Pu:240Pu:242Pu:244Pu). From this stock solution, samples were prepared for measurement of the plutonium isotopic composition by AMS. These samples have been measured in a round-robin exercise between the AMS facilities at CologneAMS, at the ANU Canberra and ETH Zurich to verify the isotopic ratio and to demonstrate the reproducibility of the measurements. The results show good agreement both between the different AMS measurements and with the gravimetrically determined nominal ratios.

  10. Recent COMPASS results on the gluon polarization

    SciTech Connect

    Quintans, Catarina

    2009-03-23

    The spin structure of the nucleon is studied in the COMPASS experiment at CERN/SPS, from the collisions of 160 GeV polarized muon beam with a {sup 6}LiD target. The data collected from 2002 to 2006 provide an accurate measurement of longitudinal double spin cross-section asymmetries. The latest results on the gluon polarization, accessed from two independent analyses of photon-gluon fusion selected events, are presented. The study of the open-charm production allows to extract the gluon polarization (in LO QCD) from the measurement of the asymmetry, the value obtained being {delta}g/g -0.49{+-}0.27(stat){+-}0.11(syst), at an average x{sub g} 0.11{sub -0.05}{sup +0.11} and a scale <{mu}{sup 2}> = 13(GeV/c){sup 2}. An alternative and independent way to study the gluon polarization, by studying the high transverse momentum hadron pairs produced, leads to a value {delta}g/g 0.08{+-}0.10(stat){+-}0.05(syst), at x{sub g}{sup a{nu}} 0.082{sub -0.027}{sup +0.041} and <{mu}{sup 2}> = 3(GeV/c){sup 2}.

  11. Imaging architecture of the Jakarta Basin, Indonesia with transdimensional inversion of seismic noise

    NASA Astrophysics Data System (ADS)

    Saygin, E.; Cummins, P. R.; Cipta, A.; Hawkins, R.; Pandhu, R.; Murjaya, J.; Masturyono, Irsyam, M.; Widiyantoro, S.; Kennett, B. L. N.

    2016-02-01

    In order to characterize the subsurface structure of the Jakarta Basin, Indonesia, a dense portable seismic broad-band network was operated by The Australian National University (ANU) and the Indonesian Agency for Meteorology, Climatology and Geophysics (BMKG) between October 2013 and February 2014. Overall 96 locations were sampled through successive deployments of 52 seismic broad-band sensors at different parts of the city. Oceanic and anthropogenic noises were recorded as well as regional and teleseismic earthquakes. We apply regularized deconvolution to the recorded ambient noise of the vertical components of available station pairs, and over 3000 Green's functions were retrieved in total. Waveforms from interstation deconvolutions show clear arrivals of Rayleigh fundamental and higher order modes. The traveltimes that were extracted from group velocity filtering of fundamental mode Rayleigh wave arrivals, are used in a 2-stage Transdimensional Bayesian method to map shear wave structure of subsurface. The images of S wave speed show very low velocities and a thick basin covering most of the city with depths up to 1.5 km. These low seismic velocities and the thick basin beneath the city potentially cause seismic amplification during a subduction megathrust or other large earthquake close to the city of Jakarta.

  12. Astronomy Thesaurus and IAU WG Libraries

    NASA Astrophysics Data System (ADS)

    Biemesderfer, C.

    2012-08-01

    There has been interest lately in updated thesaurus data for astronomy. Both AIP and IOP independently initiated efforts to revise their comprehensive physics thesauri, and ADS and the IVOA have been working on similar projects. The impetus for all of this is semantic enrichment of the existing corpuses that these organizations hold. Earlier in 2012, AIP and IOP decided to combine forces on a physics thesaurus, and they engaged Access Innovations, a company with expertise in thesaurus constr uction, to help them. The team at ADS expressed interest in the project, and both publishers ag reed that they would release the astrophysics portion of the new combined thesaurus to the astronomical community. We are in the process of assigning its ownership to the AAS, although the thesaurus will be stewarded by staff affiliated with the CfA library, and the development will continue to be done under ADS guidance. All these combined efforts are being referred to as the Unified Astronomy Thesaurus (UAT). Previously, the IAU endorsed a thesaurus that was assembled in the early 1990s by Robyn and Robert Shobbrook at ANU. It was released in print, and was subsequently turned into a website. See the subsequent article for details about the UAT.

  13. A guide to population-related home pages on the World Wide Web.

    PubMed

    Malsawma, Z

    1996-10-01

    The number of home pages on the World Wide Web is increasing, and the information they contain is constantly being updated. The Australian National University's Demography and Population Studies World-Wide Web Virtual Library (http://coombs.anu.edu.au/ResFacilities DemographyPage.html) has links to 155 pertinent sites. Some of the outstanding home pages containing population information pertaining to the US or generated by US agencies include that of 1) the US Census Bureau, 2) the US state census data centers, 3) the National Center for Health Statistics, 4) the National Institute on Aging, 5) American Demographics, Inc., 6) the UN Population Information Network, 7) the Demographic and Health Surveys, 8) the Population Reference Bureau, 9) the Population Index, 10) the US Census Bureau's International Programs Center, and 11) POPLINE. International development information can be found by visiting the web sites of 1) the International Institute for Sustainable Development, 2) USAID, 3) the UN Development Programme, and 4) the World Bank. Population Associations which have web sites include 1) the Population Association of America, 2) the Association of Population Libraries and Information Centers-International, and 3) the Association of Population Centers. Collections of population web sites can be found at Internet Resources for Demographers and Population and Reproductive Health. Finally, a directory of population organizations is also available.

  14. Prehistory of Zodiac Dating: Three Strata of Upper Paleolithic Constellations

    NASA Astrophysics Data System (ADS)

    Gurshtein, Alex A.

    A pattern of archaic proto-constellations is extracted from Aratus' "The Phaenomena" didactic poem list according to a size criterion elaborated earlier, and their symbolism is analyzed. As a result of this approach three celestial symbolical strata are discovered to be probably a reflection of the symbols for the Lower, the Middle and the Upper Worlds; the Under-World creatures have a water character, the Middle World ones are mostly anthropomorphic and flying beings are for the Upper World. The strata excerpted from Aratus' sky seems to be in agreement with the well-known Babylonian division into three god pathways for Ea (Enki), Anu and Enlil. There is a possibility of dating the pattern discovered because of precession's strong influence as far back as 16 thousand years, the result being supported by the comparison of different star group mean sizes. The archaic constellation pattern under consideration is a reasonable background of symbolical meanings for the first Zodiacal generation quartet (7.5 thousand years old) examined by the author previously. The enormous size of the Argo constellation (Ship of Argo and his Argonauts) as well as the large sizes of other southern constellations are explained as due to the existence of an accumulation zone near the South celestial pole. Some extra correlations between the reconstruction proposed and cultural data available are discussed. The paper is the second part of the investigation "On the Origin of the Zodiacal constellations" published in Vistas in Astronomy, vol.36, pp.171-190, 1993.

  15. Probing the Physics of Narrow Line Regions in Active Galaxies. II. The Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7)

    NASA Astrophysics Data System (ADS)

    Dopita, Michael A.; Shastri, Prajval; Davies, Rebecca; Kewley, Lisa; Hampton, Elise; Scharwächter, Julia; Sutherland, Ralph; Kharb, Preeti; Jose, Jessy; Bhatt, Harish; Ramya, S.; Jin, Chichuan; Banfield, Julie; Zaw, Ingyin; Juneau, Stéphanie; James, Bethan; Srivastava, Shweta

    2015-03-01

    Here we describe the Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7) and present results on 64 galaxies drawn from the first data release. The S7 uses the Wide Field Spectrograph mounted on the ANU 2.3 m telescope located at the Siding Spring Observatory to deliver an integral field of 38 × 25 arcsec at a spectral resolution of R = 7000 in the red (530-710 nm), and R = 3000 in the blue (340-560 nm). From these data cubes we have extracted the narrow-line region spectra from a 4 arcsec aperture centered on the nucleus. We also determine the Hβ and [O iii] λ5007 fluxes in the narrow lines, the nuclear reddening, the reddening-corrected relative intensities of the observed emission lines, and the Hβ and [O iii] λ5007 luminosities determined from spectra for which the stellar continuum has been removed. We present a set of images of the galaxies in [O iii] λ5007, [N ii] λ6584, and Hα, which serve to delineate the spatial extent of the extended narrow-line region and also to reveal the structure and morphology of the surrounding H ii regions. Finally, we provide a preliminary discussion of those Seyfert 1 and Seyfert 2 galaxies that display coronal emission lines in order to explore the origin of these lines.

  16. Building Nationally-Focussed, Globally Federated, High Performance Earth Science Platforms to Solve Next Generation Social and Economic Issues.

    NASA Astrophysics Data System (ADS)

    Wyborn, Lesley; Evans, Ben; Foster, Clinton; Pugh, Timothy; Uhlherr, Alfred

    2015-04-01

    properly constructed, these infrastructures can also service very small-scale research projects. The National Computational Infrastructure (NCI) at the Australian National University (ANU) has built such an HP infrastructure as part of the Australian Government's National Collaborative Research Infrastructure Strategy. NCI operates as a formal partnership between the ANU and the three major Australian National Government Scientific Agencies: the Commonwealth Scientific and Industrial Research Organisation (CSIRO), the Bureau of Meteorology and Geoscience Australia. The government partners agreed to explore the new opportunities offered within the partnership with NCI, rather than each running their own separate agenda independently. The data from these national agencies, as well as from collaborating overseas organisations (e.g., NASA, NOAA, USGS, CMIP, etc.) are either replicated to, or produced at, NCI. By co-locating and harmonising these vast data collections within the integrated HP computing environments at NCI, new opportunities have arisen for Data-intensive Interdisciplinary Science at scales and resolutions not hitherto possible. The new NCI infrastructure has also enabled the blending of research by the university sector with the more operational business of government science agencies, with the fundamental shift being that researchers from both sectors work and collaborate within a federated data and computational environment that contains both national and international data collections.

  17. Infrastructure of Baltic Region Transmission System: Analysis of Technical and Economic Factors of its Development

    NASA Astrophysics Data System (ADS)

    Obushevs, A.; Oleinikova, I.; Mutule, A.

    2014-08-01

    The operational conditions of new networks dictate new requirements for the transmission planning, which would include the electricity market figures and a sizable involvement of renewable generation. This paper focuses on the transmission expansion planning techniques based on the calculations of optimal power flows and on the concept of development planning and sustainability. A description is given for the mathematical model of calculations and analysis of transmission system. The results have shown that the Baltic transmission system infrastructure can successfully be analyzed based on the proposed methodology and developed mathematical model Baltijas valstu (Latvijas, Lietuvas un Igaunijas) energosistēmas ir cieši saistītas vēsturiski, un to darbība nav iespējama bez savstarpējas sadarbības attīstības un darba režīmu jautājumos. Ekonomisko attiecību īstenošanu enerģētikas sektorā paātrināja elektroenerģijas tirgus attīstība. Baltijas valstu enerģētikas politika ir integrēta ES enerģētikas stratēģijas sastāvdaļa, nosakot trīs galvenos mērķus: enerģētikas nozares konkurētspēja, ilgtspējīga attīstība un drošība. Visas trīs Baltijas energosistēmas veica lielu darba apjomu iekārtu modernizācijā un standartu saskaņošanā, kuras ir saskaņā ar Eiropas Savienības prasībām, kā arī par tirgus attiecību un tehnoloģiju standartu ieviešanu, lai nodrošinātu energoapgādes drošību un elektroenerģijas pieejamību patērētājiem Tomēr, ņemot vērā strauji mainīgos ārējos apstākļus, it īpaši ģeopolitiskos faktorus, Baltijas valstu enerģētikas politika būtu jāizskata ar mērķi novērtēt, kā šie faktori ietekmē energosistēmas ilgtspējīgu attīstību kopumā. No iepriekš minētā izriet, ka nepieciešama jauna nacionāla enerģētikas stratēģija, kura stiprinātu efektīvu ekonomisko un sociālo pamatu ilgtspējīgu attīstību Baltijas valstu nacionālā ekonomikā. Šī darba m

  18. HATS-7b: A Hot Super Neptune Transiting a Quiet K Dwarf Star

    NASA Astrophysics Data System (ADS)

    Bakos, G. Á.; Penev, K.; Bayliss, D.; Hartman, J. D.; Zhou, G.; Brahm, R.; Mancini, L.; de Val-Borro, M.; Bhatti, W.; Jordán, A.; Rabus, M.; Espinoza, N.; Csubry, Z.; Howard, A. W.; Fulton, B. J.; Buchhave, L. A.; Ciceri, S.; Henning, T.; Schmidt, B.; Isaacson, H.; Noyes, R. W.; Marcy, G. W.; Suc, V.; Howe, A. R.; Burrows, A. S.; Lázár, J.; Papp, I.; Sári, P.

    2015-11-01

    We report the discovery by the HATSouth network of HATS-7b, a transiting Super-Neptune with a mass of 0.120 ± 0.012 {M}{{J}}, a radius of {0.563}-0.034+0.046 {R}{{J}}, and an orbital period of 3.1853 days. The host star is a moderately bright (V=13.340\\+/- 0.010 mag, {K}S=10.976\\+/- 0.026 mag) K dwarf star with a mass of 0.849 ± 0.027 {M}⊙ , a radius of {0.815}-0.035+0.049 {R}⊙ , and a metallicity of [{Fe}/{{H}}] =+0.250\\+/- 0.080. The star is photometrically quiet to within the precision of the HATSouth measurements, has low RV jitter, and shows no evidence for chromospheric activity in its spectrum. HATS-7b is the second smallest radius planet discovered by a wide-field ground-based transit survey, and one of only a handful of Neptune-size planets with mass and radius determined to 10% precision. Theoretical modeling of HATS-7b yields a hydrogen-helium fraction of 18 ± 4% (rock-iron core and H2-He envelope), or 9 ± 4% (ice core and H2-He envelope), i.e., it has a composition broadly similar to that of Uranus and Neptune, and very different from that of Saturn, which has 75% of its mass in H2-He. Based on a sample of transiting exoplanets with accurately (<20%) determined parameters, we establish approximate power-law relations for the envelopes of the mass-density distribution of exoplanets. HATS-7b, which, together with the recently discovered HATS-8b, is one of the first two transiting super-Neptunes discovered in the Southern sky, is a prime target for additional follow-up observations with Southern hemisphere facilities to characterize the atmospheres of Super-Neptunes (which we define as objects with mass greater than that of Neptune, and smaller than halfway between that of Neptune and Saturn, i.e., 0.054 {M}{{J}}\\lt {M}{{p}}\\lt 0.18 {M}{{J}}). The HATSouth network is operated by a collaboration consisting of Princeton University (PU), the Max Planck Institute für Astronomie (MPIA), the Australian National University (ANU), and the Pontificia

  19. Solid-state actinide acid phosphites from phosphorous acid melts

    SciTech Connect

    Oh, George N.; Burns, Peter C.

    2014-07-01

    The reaction of UO{sub 3} and H{sub 3}PO{sub 3} at 100 °C and subsequent reaction with dimethylformamide (DMF) produces crystals of the compound (NH{sub 2}(CH{sub 3}){sub 2})[UO{sub 2}(HPO{sub 2}OH)(HPO{sub 3})]. This compound crystallizes in space group P2{sub 1}/n and consists of layers of uranyl pentagonal bipyramids that share equatorial vertices with phosphite units, separated by dimethylammonium. In contrast, the reaction of phosphorous acid and actinide oxides at 210 °C produces a viscous syrup. Subsequent dilution in solvents and use of standard solution-state methods results in the crystallization of two polymorphs of the actinide acid phosphites An(HPO{sub 2}OH){sub 4} (An=U, Th) and of the mixed acid phosphite–phosphite U(HPO{sub 3})(HPO{sub 2}OH){sub 2}(H{sub 2}O)·2(H{sub 2}O). α- and β-An(HPO{sub 2}OH){sub 4} crystallize in space groups C2/c and P2{sub 1}/n, respectively, and comprise a three-dimensional network of An{sup 4+} cations in square antiprismatic coordination corner-sharing with protonated phosphite units, whereas U(HPO{sub 3})(HPO{sub 2}OH){sub 2}(H{sub 2}O){sub 2}·(H{sub 2}O) crystallizes in a layered structure in space group Pbca that is composed of An{sup 4+} cations in square antiprismatic coordination corner-sharing with protonated phosphites and water ligands. We discuss our findings in using solid inorganic reagents to produce a solution-workable precursor from which solid-state compounds can be crystallized. - Graphical abstract: Reaction of UO{sub 3} and H{sub 3}PO{sub 3} at 100 °C and subsequent reaction with DMF produces crystals of (NH{sub 2}(CH{sub 3}){sub 2})[UO{sub 2}(HPO{sub 2}OH)(HPO{sub 3})] with a layered structure. Reaction of phosphorous acid and actinide oxides at 210 °C produces a viscous syrup and further solution-state reactions result in the crystallization of the actinide acid phosphites An(HPO{sub 2}OH){sub 4} (An=U, Th), with a three-dimensional network structure, and the mixed acid phosphite

  20. HATS-6b: A Warm Saturn Transiting an Early M Dwarf Star, and a Set of Empirical Relations for Characterizing K and M Dwarf Planet Hosts

    NASA Astrophysics Data System (ADS)

    Hartman, J. D.; Bayliss, D.; Brahm, R.; Bakos, G. Á.; Mancini, L.; Jordán, A.; Penev, K.; Rabus, M.; Zhou, G.; Butler, R. P.; Espinoza, N.; de Val-Borro, M.; Bhatti, W.; Csubry, Z.; Ciceri, S.; Henning, T.; Schmidt, B.; Arriagada, P.; Shectman, S.; Crane, J.; Thompson, I.; Suc, V.; Csák, B.; Tan, T. G.; Noyes, R. W.; Lázár, J.; Papp, I.; Sári, P.

    2015-05-01

    We report the discovery by the HATSouth survey of HATS-6b, an extrasolar planet transiting a V = 15.2 mag, i = 13.7 mag M1V star with a mass of 0.57 {{M}⊙ } and a radius of 0.57 {{R}⊙ }. HATS-6b has a period of P = 3.3253 d, mass of {{M}p} = 0.32 {{M}J}, radius of {{R}p} = 1.00 {{R}J}, and zero-albedo equilibrium temperature of {{T}eq} = 712.8 ± 5.1 K. HATS-6 is one of the lowest mass stars known to host a close-in gas giant planet, and its transits are among the deepest of any known transiting planet system. We discuss the follow-up opportunities afforded by this system, noting that despite the faintness of the host star, it is expected to have the highest K-band S/N transmission spectrum among known gas giant planets with {{T}eq}\\lt 750 K. In order to characterize the star we present a new set of empirical relations between the density, radius, mass, bolometric magnitude, and V-, J-, H- and K-band bolometric corrections for main sequence stars with M\\lt 0.80 {{M}⊙ }, or spectral types later than K5. These relations are calibrated using eclipsing binary components as well as members of resolved binary systems. We account for intrinsic scatter in the relations in a self-consistent manner. We show that from the transit-based stellar density alone it is possible to measure the mass and radius of a ˜0.6 {{M}⊙ } star to ˜7 and ˜2% precision, respectively. Incorporating additional information, such as the V-K color, or an absolute magnitude, allows the precision to be improved by up to a factor of two. The HATSouth network is operated by a collaboration consisting of Princeton University (PU), the Max Planck Institute für Astronomie (MPIA), the Australian National University (ANU), and the Pontificia Universidad Católica de Chile (PUC). The station at Las Campanas Observatory (LCO) of the Carnegie Institute is operated by PU in conjunction with PUC, the station at the High Energy Spectroscopic Survey (H.E.S.S.) site is operated in conjunction with MPIA

  1. HATSouth: A Global Network of Fully Automated Identical Wide-Field Telescopes

    NASA Astrophysics Data System (ADS)

    Bakos, G. Á.; Csubry, Z.; Penev, K.; Bayliss, D.; Jordán, A.; Afonso, C.; Hartman, J. D.; Henning, T.; Kovács, G.; Noyes, R. W.; Béky, B.; Suc, V.; Csák, B.; Rabus, M.; Lázár, J.; Papp, I.; Sári, P.; Conroy, P.; Zhou, G.; Sackett, P. D.; Schmidt, B.; Mancini, L.; Sasselov, D. D.; Ueltzhoeffer, K.

    2013-02-01

    transiting planets from HATSouth. We highlight the advantages of networked operations, namely, a threefold increase in the expected number of detected planets, as compared to all telescopes operating from the same site. The HATSouth hardware was acquired by NSF MRI NSF/AST-0723074 and is owned by Princeton University. The HATSouth network is operated by a collaboration consisting of Princeton University (PU), the Max Planck Institute for Astronomy (MPIA), and the Australian National University (ANU). The station at Las Campanas Observatory (LCO), of the Carnegie Institution for Science, is operated by PU in conjunction with collaborators at the Pontificia Universidad Católica de Chile (PUC); the station at the High Energy Spectroscopic Survey (HESS) site is operated in conjunction with MPIA; and the station at Siding Springs Observatory (SSO) is operated jointly with ANU.

  2. Operative and technological management of super-large united power grids: lessons of major world's blackouts

    NASA Astrophysics Data System (ADS)

    Brinkis, K.; Kreslins, V.; Mutule, A.

    2014-02-01

    Power system (PS) blackouts still persist worldwide, evidencing that the existing protective structures need to be improved. The discussed requirements and criteria to be met for joint synchronous operation of large and super-large united PSs should be based on close co-ordination of operative and technological management of all PSs involved in order to ensure secure and stable electricity supply and minimise or avoid the threat of a total PS blackout. The authors analyse the July 2012 India blackout - the largest power outage in history, which affected over 620 million people, i.e. half of India's population and spread across its 22 states. The analysis is of a general character, being applicable also to similar blackouts that have occurred in Europe and worldwide since 2003. The authors summarise and develop the main principles and methods of operative and technological management aimed at preventing total blackouts in large and super-large PSs. Neskatoties uz sasniegumiem elektroenerģētikas jomā un energosistēmu nepārtrauktu modernizāciju, pasaulē regulāri notiek sabrukumu avārijas. Rakstā apskatīti lielu un superlielu energosistēmu apvienību savstarpējas sinhronas darbības nodrošinājuma prasības un kritēriji, kas pamatojas uz operatīvās un tehnoloģiskās vadības ciešu koordināciju starp energosistēmām. Savstarpējas sinhronas darbības nodrošinājuma prasībām un kritērijiem ir izšķiroša nozīme, lai panāktu elektroapgādes drošumu un stabilitāti katrā energosistēmā, kas darbojas apvienotas energosistēmas sastāvā. Šo prasību un kritēriju ievērošana sekmē totālo avāriju izcelšanās iespēju samazināšanu un to novēršanu. Indijas 2012.gada totālo avāriju un citu analogo avāriju Eiropā un Amerikā analīze un izvērtējums laika posmā no 2003.gada, deva iespēju apkopot un izstrādāt lielu un superlielu energosistēmu operatīvās un tehnoloģiskās vadības principus un metodoloģiju, lai novērstu vai

  3. Viscosity structure of Earth's mantle inferred from rotational variations due to GIA process and recent melting events

    NASA Astrophysics Data System (ADS)

    Nakada, Masao; Okuno, Jun'ichi; Lambeck, Kurt; Purcell, Anthony

    2015-08-01

    We examine the geodetically derived rotational variations for the rate of change of degree-two harmonics of Earth's geopotential, skew5dot J_2, and true polar wander, combining a recent melting model of glaciers and the Greenland and Antarctic ice sheets taken from the IPCC 2013 Report (AR5) with two representative GIA ice models describing the last deglaciation, ICE5G and the ANU model developed at the Australian National University. Geodetically derived observations of skew4dot J_2 are characterized by temporal changes of -(3.7 ± 0.1) × 10-11 yr-1 for the period 1976-1990 and -(0.3 ± 0.1) × 10-11 yr-1 after ˜2000. The AR5 results make it possible to evaluate the recent melting of the major ice sheets and glaciers for three periods, 1900-1990, 1991-2001 and after 2002. The observed skew4dot J_2 and the component of skew4dot J_2 due to recent melting for different periods indicate a long-term change in skew4dot J_2-attributed to the Earth's response to the last glacial cycle-of -(6.0-6.5) × 10-11 yr-1, significantly different from the values adopted to infer the viscosity structure of the mantle in most previous studies. This is a main conclusion of this study. We next compare this estimate with the values of skew4dot J_2 predicted by GIA ice models to infer the viscosity structure of the mantle, and consequently obtain two permissible solutions for the lower mantle viscosity (ηlm), ˜1022 and (5-10) × 1022 Pa s, for both adopted ice models. These two solutions are largely insensitive to the lithospheric thickness and upper mantle viscosity as indicated by previous studies and relatively insensitive to the viscosity structure of the D″ layer. The ESL contributions from the Antarctic ice sheet since the last glacial maximum (LGM) for ICE5G and ANU are about 20 and 30 m, respectively, but glaciological reconstructions of the Antarctic LGM ice sheet have suggested that its ESL contribution may have been less than ˜10 m. The GIA-induced skew4dot J_2 for GIA

  4. Effect of Microwave Pre-Processing of Pelletized Biomass on its Gasification and Combustion / Mikroviļnu Priekšapstrādes Ietekme Uz Granulētas Biomasas Gazifikācijas Un Degšanas Procesiem

    NASA Astrophysics Data System (ADS)

    Barmina, I.; Līckrastiņa, A.; Valdmanis, J.; Valdmanis, R.; Zaķe, M.; Arshanitsa, A.; Telysheva, G.; Solodovnik, V.

    2013-08-01

    tījumu rezultātā konstatēts, ka mikroviļņu priekšapstrāde nodrošina intensīvāku biomasas gazifikāciju, ātrāku gaistošo savienojumu veidošanos, uzliesmošanu un pilnīgāku sadedzināšanu ar sekojošu saražotās īpatnējā siltuma enerģijas pieaugumu

  5. Building the Petascale National Environmental Research Interoperability Data Platform (NERDIP): Minimizing the 'Trough of Disillusionment' and Accelerating Pathways to the 'Plateau of Productivity'

    NASA Astrophysics Data System (ADS)

    Wyborn, L. A.; Evans, B. J. K.

    2015-12-01

    The National Computational Infrastructure (NCI) at the Australian National University (ANU) has evolved to become Australia's peak computing centre for national computational and Data-intensive Earth system science. More recently NCI collocated 10 Petabytes of 34 major national and international environmental, climate, earth system, geophysics and astronomy data collections to create the National Environmental Research Interoperability Data Platform (NERDIP). Spatial scales of the collections range from global to local ultra-high resolution, whilst sizes range from 3PB down to a few GB. The data is highly connected to both NCI HPC and cloud resources via low latency internal networks with massive bandwidth. Now that the collections are collocated on a single data platform, the 'Hype' and expectations around potential use cases for the NERDIP are high. Not unexpected issues are emerging such as access, licensing issues, ownership, and incompatible data standards. Many communities are standardised within their domain, but achieving true interdisciplinary science will require all communities to move towards open interoperable data formats such as NetCDF4/HDF5. This transition will impact on software using proprietary or non-open standards. But before we reach the 'Plateau of Productivity', there needs to be greater 'Enlightenment' of users to encourage them to realise that this unprecedented Earth system science platform provides a rich mine of opportunities for discovery and innovation for a diverse range of both domain-specific and interdisciplinary investigations including climate and weather research, impact analysis, environment, remote sensing and geophysics and develop new and innovative interdisciplinary use cases that will guide those architecting the system and help minimise the amplitude of the 'Trough of Disillusionment' and ensure greater productivity and uptake of the collections that make NERDIP unique in the next generation of Data-intensive Science.

  6. Isolation, characterization and biological evaluation of bioactive metabolites from Nocardia levis MK-VL_113.

    PubMed

    Kavitha, Alapati; Prabhakar, Peddikotla; Narasimhulu, Manchala; Vijayalakshmi, Muvva; Venkateswarlu, Yenamandra; Rao, Karanam Venkateswara; Raju, Venkata Balaraju Subba

    2010-03-31

    An Actinomycete isolate found to be prominent in the laterite soils of Acharya Nagarjuna University (ANU) Campus, Guntur was identified as Nocardia levis MK-VL_113 by 16S rRNA analysis. Cultural, morphological and physiological characteristics of the strain were recorded. Screening of secondary metabolites obtained from 4-day old culture broth of the strain led to the isolation of two fractions active against a wide variety of Gram-positive, Gram-negative bacteria and fungi. The structure of the first active fraction was elucidated using FT-IR, EI-MS, (1)H NMR and (13)C NMR spectra and identified as 1-phenylbut-3-ene-2-ol which is first time reported as a natural product. The compound exhibited good antimicrobial potential against the opportunistic and pathogenic bacteria and fungi. The antifungal activity of the strain and its metabolite were further confirmed with in vitro and in vivo studies. Evidence for the antagonism of the strain against Fusarium oxysporum, causing wilt disease in sorghum was demonstrated by the formation of inhibition zone in in vitro plate assay and reduction in the incidence of wilt of sorghum plants by using a green house trial. Analysis of the rhizosphere soil extracts by high performance liquid chromatography also demonstrated the production of the compound by the strain under in vivo conditions. As compared to the commercial fungicide mancozeb, the bioactive compound, 1-phenylbut-3-ene-2-ol was highly effective in controlling wilt of sorghum. Besides, the partially purified second fraction (PPF) subjected to gas chromatography-mass spectrometry revealed the presence of phenylethyl alcohol, dibutyl phthalate and 1,2-benzenedicarboxylic acid, 3-nitro.

  7. Single detector stereo-SCIDAR for Mount Stromlo

    NASA Astrophysics Data System (ADS)

    Grosse, Doris; Bennet, Francis; Korkiakoski, Visa; Rigaut, Francois; Thorn, Elliott

    2016-07-01

    Satellite tracking and imaging is conducted by the ANU Research School of Astronomy and Astrophysics and Electro-Optic Systems (EOS) at Mount Stromlo Observatory, Canberra, Australia, as part of the Space Environment Management Cooperative Research Centre (SERC) to support the development in space situational awareness. Atmospheric turbulence leads to distortions in the measured data. Adaptive optics (AO) systems counteract those distortions and improve the resolution of the tracking and imaging systems. To assist in the design of the AO systems, we need to gather information on the atmosphere at Mount Stromlo: r0, τ 0, and the turbulence Cn2 profile. With the SCIntillation Detection And Ranging (SCIDAR) Technique the scintillation of two stars is measured and their autocorrelation function is computed, providing a measurement of the turbulence profile. This technique usually uses one detector recording the two images of the stars simultaneously. However, the images overlap leading to an underestimation of the Cn2 values. The introduction of stereo-SCIDAR1 over- comes this issue by separating the two stars and imaging them on two separate image sensors. To reduce costs, we introduce a new stereo-SCIDAR system separating the beams from the two stars, but using only one single detector. This has been shown for a Low Layer SCIDAR (LOLAS) system with wide double stars (200 arcsec). We investigate this technique by detecting the scintillation patterns of double stars with separation from 10 to 25 arcsec, allowing some flexibility in the altitude span and resolution, while retaining a simple optical setup. We selected a low noise sCMOS camera as the imager. We show the current design of this system and investigate its feasibility for further development.

  8. Problems for the WELS classification of planetary nebula central stars: self-consistent nebular modelling of four candidates

    NASA Astrophysics Data System (ADS)

    Basurah, Hassan M.; Ali, Alaa; Dopita, Michael A.; Alsulami, R.; Amer, Morsi A.; Alruhaili, A.

    2016-05-01

    We present integral field unit (IFU) spectroscopy and self-consistent photoionization modelling for a sample of four southern Galactic planetary nebulae (PNe) with supposed weak emission-line central stars. The Wide Field Spectrograph on the ANU 2.3 m telescope has been used to provide IFU spectroscopy for NGC 3211, NGC 5979, My 60, and M 4-2 covering the spectral range of 3400-7000 Å. All objects are high-excitation non-Type I PNe, with strong He II emission, strong [Ne V] emission, and weak low-excitation lines. They all appear to be predominantly optically thin nebulae excited by central stars with Teff > 105 K. Three PNe of the sample have central stars which have been previously classified as weak emission-line stars (WELS), and the fourth also shows the characteristic recombination lines of a WELS. However, the spatially resolved spectroscopy shows that rather than arising in the central star, the C IV and N III recombination line emission is distributed in the nebula, and in some cases concentrated in discrete nebular knots. This may suggest that the WELS classification is spurious, and that, rather, these lines arise from (possibly chemically enriched) pockets of nebular gas. Indeed, from careful background subtraction we were able to identify three of the sample as being hydrogen rich O(H)-Type. We have constructed fully self-consistent photoionization models for each object. This allows us to independently determine the chemical abundances in the nebulae, to provide new model-dependent distance estimates, and to place the central stars on the Hertzsprung-Russell diagram. All four PNe have similar initial mass (1.5 < M/M⊙ < 2.0) and are at a similar evolutionary stage.

  9. Development of Technologies for Natural Gas and Biogas Utilization in Transport / Apskats Par Transporta SEKTORĀ IZMANTOJAMĀM DABASGĀZES un BIOGĀZES TEHNOLOĢIJĀM

    NASA Astrophysics Data System (ADS)

    Gelfgat, Y.; Smigins, R.

    2013-12-01

    Popularity of methane-containing gaseous fuels has slowly been growing since their appearance, especially in the last decades. Occasional non-availability of liquid fossil fuels, the necessity to reduce the transportation costs and to improve the air quality are the basic factors which stimulated development of gas utilization technologies - from accumulation, compression and deflation of gas to its usage in internal combustion engines. Since then different solutions have been offered, and the authors are reviewing them - from the first use of natural gas to nowadays. Metāna saturošo gāzu popularitāte kopš to atklāšanas ir pakāpeniski augusi, jo īpaši pēdējās desmitgadēs. Šķidro fosilo degvielu ierobežotā pieejamība dažādos laika periodos, transporta izdevumu izmaksu samazināšana, nepieciešamība uzlabot gaisa kvalitāti - tie ir pamatfaktori, kas sekmējuši gāzes izmantošanas tehnoloģiju attīstību, sākot no gāzes uzkrāšanas, kompresijas un izplūdes sistēmām, un beidzot ar to izmantošanu iekšdedzes motoru darbināšanai. Šajā laikā ir parādījušies dažādi šo tehnoloģiju risinājumi, un dotais raksts sniedz pārskatu par tiem, sākot no pirmās dabasgāzes izmantošanas līdz pat mūsdienām.

  10. The role of IUCN protected area categories in the conservation of geoheritage

    NASA Astrophysics Data System (ADS)

    Woo, Kyung Sik; Gordon, John E.; Crofts, Roger; Diaz-Martinez, Enrique; McKeever, Patrick J.; Hill, Wesley

    2015-04-01

    Geoheritage comprises those elements of the Earth's geodiversity that are considered to have significant scientific, educational, cultural/aesthetic, ecological or ecosystem service value. IUCN Resolutions 4.040 (2008) and 5.048 (2012) both clearly recognise that geodiversity is part of nature and geoheritage is part of natural heritage. Formal recognition of the geodiversity component of protected areas was made in 2008 in the revised IUCN Guidelines for Applying Protected Area Management Categories (Dudley, 2008). All 6 of the IUCN Protected Area Management Categories (strict nature reserve/wilderness area, national park, national monument or feature, habitat/species management area, protected landscape/seascape, and protected area with sustainable use of natural resources) are applicable to the protection of geoheritage and provide opportunities to integrate conservation of geosites and the wider landscape values of geodiversity much more closely in protected area networks (Crofts & Gordon, 2015). Although geoparks are not a protected area category as such, and may only include some parts of protected areas as geosites, the UNESCO-supported Global Geoparks Network also provides an international framework to conserve and enhance geoheritage, as does the UNESCO World Heritage List. The Geoheritage Specialist Group of the IUCN World Commission on Protected Areas provides specialist advice and guidance on all aspects of geodiversity and geoheritage in relation to the establishment and management of protected areas, the integration of geodiversity into IUCN's programmes, and the promotion of better understanding of the links between geodiversity and biodiversity. http://www.iucn.org/about/work/programmes/gpap_home/gpap_biodiversity/gpap_wcpabiodiv/gpap_geoheritage/). Crofts, R., Gordon, J. E. (2015) Geoconservation in protected areas. In: G.L. Worboys, M. Lockwood, A. Kothari, S. Feary, I. Pulsford (eds), Protected Area Governance and Management. ANU Press, Canberra

  11. Isotopic zonations in silicic magma chambers: conventional and ion-microprobe data from the late-Oligocene Questa caldera, northern New Mexico

    SciTech Connect

    Johnson, C.M.

    1985-01-01

    The >400km3 peralkaline high-SiO/sub 2/ rhyolite ash-flow tuff erupted form the Questa caldera is strongly zoned in trace elements and in initial 87Sr/86Sr, from 0.7082 at the top to 0.7123 at the base. This is accompanied by increasing abundance of zircons with inherited cores, as identified using the ANU SHRIMP ion-microprobe. Cores that are concordant at 1700, 100 and 1430 Ma occur within late-Oligocene zircons in the ash-flow tuff. Such inherited cores is best explained by a greater degree of assimilation of Precambrian roof rocks toward the top of the magma chamber prior to eruption. In contrast, element of Nd and delta 180 values are constant at -6 and +7, respectively. Mass-balance calculations using observed compositions of the Precambrian wall-rocks and the low Sr peralkaline magmas indicate that the amount of assimilation required is less than 15 percent. Peralkaline and metaluminous intrusions cogenetic with the ash flow tuff also have relatively constant element of Nd and delta 180 values of -6 and +7, but have initial 87Sr/86Sr between from 0.7077 to 0.7050. None of the intrusive bodies contain inherited zircons, in contrast with many other Tertiary granitic rocks in the western US. Comparison of isotopic zonations in magmas that are largely liquid with those in their solidified equivalents is important for distinguishing assimilation vs source effects, since the assimilation potential of volatile-rich, crystal-poor magmas is much different from that of the crystal-rich magmas that become plutons.

  12. The proteome of seed development in the model legume Lotus japonicus.

    PubMed

    Dam, Svend; Laursen, Brian S; Ornfelt, Jane H; Jochimsen, Bjarne; Staerfeldt, Hans Henrik; Friis, Carsten; Nielsen, Kasper; Goffard, Nicolas; Besenbacher, Søren; Krusell, Lene; Sato, Shusei; Tabata, Satoshi; Thøgersen, Ida B; Enghild, Jan J; Stougaard, Jens

    2009-03-01

    We have characterized the development of seeds in the model legume Lotus japonicus. Like soybean (Glycine max) and pea (Pisum sativum), Lotus develops straight seed pods and each pod contains approximately 20 seeds that reach maturity within 40 days. Histological sections show the characteristic three developmental phases of legume seeds and the presence of embryo, endosperm, and seed coat in desiccated seeds. Furthermore, protein, oil, starch, phytic acid, and ash contents were determined, and this indicates that the composition of mature Lotus seed is more similar to soybean than to pea. In a first attempt to determine the seed proteome, both a two-dimensional polyacrylamide gel electrophoresis approach and a gel-based liquid chromatography-mass spectrometry approach were used. Globulins were analyzed by two-dimensional polyacrylamide gel electrophoresis, and five legumins, LLP1 to LLP5, and two convicilins, LCP1 and LCP2, were identified by matrix-assisted laser desorption ionization quadrupole/time-of-flight mass spectrometry. For two distinct developmental phases, seed filling and desiccation, a gel-based liquid chromatography-mass spectrometry approach was used, and 665 and 181 unique proteins corresponding to gene accession numbers were identified for the two phases, respectively. All of the proteome data, including the experimental data and mass spectrometry spectra peaks, were collected in a database that is available to the scientific community via a Web interface (http://www.cbs.dtu.dk/cgi-bin/lotus/db.cgi). This database establishes the basis for relating physiology, biochemistry, and regulation of seed development in Lotus. Together with a new Web interface (http://bioinfoserver.rsbs.anu.edu.au/utils/PathExpress4legumes/) collecting all protein identifications for Lotus, Medicago, and soybean seed proteomes, this database is a valuable resource for comparative seed proteomics and pathway analysis within and beyond the legume family.

  13. Potential Field Modeling at Global to Prospect Scales - Adding Value to the Geological, Seismic, Gravity, Magnetic and Rock Property Datasets of Australia

    NASA Astrophysics Data System (ADS)

    Lane, R. J. L.

    2015-12-01

    At Geoscience Australia, we are upgrading our gravity and magnetic modeling tools to provide new insights into the composition, properties, and structure of the subsurface. The scale of the investigations varies from the size of tectonic plates to the size of a mineral prospect. To accurately model potential field data at all of these scales, we require modeling software that can operate in both spherical and Cartesian coordinate frameworks. The models are in the form of a mesh, with spherical prismatic (tesseroid) elements for spherical coordinate models of large volumes, and rectangular prisms for smaller volumes evaluated in a Cartesian coordinate framework. The software can compute the forward response of supplied rock property models and can perform inversions using constraints that vary from weak generic smoothness through to very specific reference models compiled from various types of "hard facts" (i.e., surface mapping, drilling information, crustal seismic interpretations). To operate efficiently, the software is being specifically developed to make use of the resources of the National Computational Infrastructure (NCI) at the Australian National University (ANU). The development of these tools is been carried out in collaboration with researchers from the Colorado School of Mines (CSM) and the China University of Geosciences (CUG) and is at the stage of advanced testing. The creation of individual 3D geological models will provide immediate insights. Users will also be able to combine models, either by stitching them together or by nesting smaller and more detailed models within a larger model. Comparison of the potential field response of a composite model with the observed fields will give users a sense of how comprehensively these models account for the observations. Users will also be able to model the residual fields (i.e., the observed minus calculated response) to discover features that are not represented in the input composite model.

  14. NolL of Rhizobium sp. Strain NGR234 Is Required for O-Acetyltransferase Activity

    PubMed Central

    Berck, S.; Perret, X.; Quesada-Vincens, D.; Promé, J.-C.; Broughton, W. J.; Jabbouri, S.

    1999-01-01

    Following (iso)flavonoid induction, nodulation genes of the symbiotic nitrogen-fixing bacterium Rhizobium sp. strain NGR234 elaborate a large family of lipooligosaccharidic Nod factors (NodNGR factors). When secreted into the rhizosphere of compatible legumes, these signal molecules initiate root hair deformation and nodule development. The nonreducing glucosamine residue of NodNGR factors are N acylated, N methylated, and mono- or biscarbamoylated, while position C-6 of the reducing extremity is fucosylated. This fucose residue is normally 2-O methylated and either sulfated or acetylated. Here we present an analysis of all acetylated NodNGR factors, which clearly shows that the acetate group may occupy position C-3 or C-4 of the fucose moiety. Disruption of the flavonoid-inducible nolL gene, which is preceded by a nod box, results in the synthesis of NodNGR factors that lack the 3-O- or 4-O-acetate groups. Interestingly, the nodulation capacity of the mutant NGRΩnolL is not impaired, whereas introduction of the nod box::nolL construct into the related strain Rhizobium fredii USDA257 extends the host range of this bacterium to Calopogonium caeruleum, Leucaena leucocephala, and Lotus halophilus. Nod factors produced by a USDA257(pnolL) transconjugant were also acetylated. The nod box::nolL construct was also introduced into ANU265 (NGR234 cured of its symbiotic plasmid), along with extra copies of the nodD1 gene. When permeabilized, these cells possessed acetyltransferase activity, although crude extracts did not. PMID:9922261

  15. A modern analogue for tectonic, eustatic, and climatic processes in cratonic basins: Gulf of Carpentaria, northern Australia

    USGS Publications Warehouse

    Edgar, N. Terence; Cecil, C. Blaine; Mattick, R.E.; de Deckker, Patrick; Djajadihardja, Yusuf S.

    2003-01-01

    The Gulf of Carpentaria is a tropical, silled epicontinental sea and may be a modern analogue for ancient cratonic basins. For the purpose of this study, the Gulf of Carpentaria is compared to Pennsylvanian cratonic basins of the United States. During the Pennsylvanian, the North American continent moved from the Southern Hemisphere, through the Equator, into the Northern Hemisphere. Today, the Gulf of Carpentaria–New Guinea region is a few degrees south of the Equator and is moving towards it. During the Pennsylvanian, the world was subjected to major glaciations and associated sea-level changes. The island of New Guinea and the Gulf of Carpentaria have undergone similar processes during the Quaternary. A reconnaissance seismic survey of the gulf conducted by the USGS and the Australian National University (ANU), combined with oil-exploration well data, provided the first step in a systematic evaluation of a modern tropical epicontinental system. During the Cenozoic, the region was dominated by terrestrial sedimentation in a temperate climate. At the same time, carbonates were being deposited on the northern shelf edge of the Australian Plate. During the Miocene, carbonate deposition expanded southward into the gulf region. Then in the Late Miocene, carbonate sedimentation was replaced by terrigenous clastics derived from the developing Central Range of the island of New Guinea, which developed a wetter climate while moving northwards into the tropics. At least 14 basin-wide transgressive–regressive cycles are identified by channels that were eroded under subaerial conditions since about the Miocene. Comparison of the modern Gulf of Carpentaria sequences with those of the Pennsylvanian reveals many similarities.

  16. THE Interoperability Challenge for the Geosciences: Stepping up from Interoperability between Disciplinary Siloes to Creating Transdisciplinary Data Platforms.

    NASA Astrophysics Data System (ADS)

    Wyborn, L. A.; Evans, B. J. K.; Trenham, C.; Druken, K. A.; Wang, J.

    2015-12-01

    The National Computational Infrastructure (NCI) at the Australian National University (ANU) has collocated over 10 PB of national and international data assets within a HPC facility to create the National Environmental Research Data Interoperability Platform (NERDIP). The data span a wide range of fields from the earth systems and environment (climate, coasts, oceans, and geophysics) through to astronomy, bioinformatics, and the social sciences. These diverse data collections are collocated on a major data storage node that is linked to a Petascale HPC and Cloud facility. Users can search across all of the collections and either log in and access the data directly, or they can access the data via standards-based web services. These collocated petascale data collections are theoretically a massive resource for interdisciplinary science at scales and resolutions never hitherto possible. But once collocated, multiple barriers became apparent that make cross-domain data integration very difficult and often so time consuming, that either less ambitious research goals are attempted or the project is abandoned. Incompatible content is only one half of the problem: other showstoppers are differing access models, licences and issues of ownership of derived products. Brokers can enable interdisciplinary research but in reality are we just delaying the inevitable? A call to action is required adopt a transdiciplinary approach at the conception of development of new multi-disciplinary systems whereby those across all the scientific domains, the humanities, social sciences and beyond work together to create a unity of informatics plaforms that interoperate horizontally across the multiple discipline boundaries, and also operate vertically to enable a diversity of people to access data from high end researchers, to undergraduate, school students and the general public. Once we master such a transdisciplinary approach to our vast global information assets, we will then achieve

  17. Physical and Technical Energy Problems: Testing of the Prototype for State Estimation of Large-Scale Power Systems / Lielo Energosistēmu Stāvokļa Novērtēšanas Prototipa Testēšana

    NASA Astrophysics Data System (ADS)

    Kochukov, O.; Briņķis, K.; Mutule, A.

    2013-08-01

    The paper describes the algorithm for distributed state estimation (SE) and is focused on its testing and validation. For this purpose, different events in the modeled power system of the 330-750 kV electrical ring Latvia - Lithuania - Belarus - Smolensk - Moscow - St. Petersburg - Estonia - Latvia were considered. The methods for testing the Inter-TSO SE prototype and dynamic network monitoring & modeling are based on comparison of the available SCADA data about real events with those of SE calculation. In total, four operational states were studied, including initial, accident and two post-accident operational states Rakstā tiek aprakstīti, testēti un novērtēti izkliedēta stāvokļa novērtēšanas algoritmi. Testēšanas nolūkos tika izmantoti dažādi 330-750 kV elektriskā loka Latvija - Lietuva - Baltkrievija - Smoļenska - Maskava - Pēterburga - Igaunija - Latvija modelēti scenāriji. Prototipa testēšanas metodoloģija balstīta uz pieejamo SCADA datu salīdzināšanu ar stāvokļa novērtēšanas prototipa aprēķina rezultātiem. Kopumā apskatīti sākotnējais, avārijas un divi pēcavārijas režīmi

  18. Basin and Crustal Structure of Jakarta and Bandung, Indonesia from Two Seismic Campaigns

    NASA Astrophysics Data System (ADS)

    Saygin, E.; Cummins, P. R.; Cipta, A.; Irsam, M.; Masturyono, M.; Murjaya, J.; Nugraha, A. D.; Pandhu, R.; Widiyantoro, S.; Zulhan, Z.

    2014-12-01

    Between October 2013 and February 2014, a dense portable seismic broadband network was operated by The Australian National University (ANU) and Indonesian Agency for Meteorology, Climatology and Geophysics (BMKG) in Jakarta, Indonesia. Jakarta is located in Java Island, Indonesia, with a population over 10 million. Overall 96 points were sampled through the successive deployments of 52 seismic broadband sensors at different parts of the city. After recording continuous seismic data for 5 months, the network was shifted to Bandung, another city to the south-east of Jakarta on March 2014. Bandung is situated on a old lake deposit surrounded by volcanic provinces. The configuration of the seismic network at Bandung encompasses the whole city as well as an active volcano-Tangkuban Perahu and Lembang Fault both located just outside of the city.In both of the experiments, oceanic and anthropogenic noise were recorded as well as local and regional earthquakes. We apply regularized deconvolution to the recorded data of the vertical components of available station pairs, and over 4000 Green's functions were retrieved in total. Waveforms from stacked interstation deconvolutions show clear arrivals of Rayleigh and body waves. The traveltimes that were extracted from the group velocity filtering of Rayleigh wave arrivals, are used in a Transdimensional Bayesian seismic tomography method to map the velocity perturbations across cities. The constructed images at Jakarta mark the very low group velocities of Rayleigh waves, as low as 150 m/s at 1 Hz showing influence of a very low velocity basin. Low seismic velocity regions imaged through seismic noise tomography beneath both cities potentially posses a large risk of causing seismic amplification during a large earthquake close to the cities.

  19. The Earth System Grid Federation (ESGF) Project

    NASA Astrophysics Data System (ADS)

    Carenton-Madiec, Nicolas; Denvil, Sébastien; Greenslade, Mark

    2015-04-01

    The Earth System Grid Federation (ESGF) Peer-to-Peer (P2P) enterprise system is a collaboration that develops, deploys and maintains software infrastructure for the management, dissemination, and analysis of model output and observational data. ESGF's primary goal is to facilitate advancements in Earth System Science. It is an interagency and international effort led by the US Department of Energy (DOE), and co-funded by National Aeronautics and Space Administration (NASA), National Oceanic and Atmospheric Administration (NOAA), National Science Foundation (NSF), Infrastructure for the European Network of Earth System Modelling (IS-ENES) and international laboratories such as the Max Planck Institute for Meteorology (MPI-M) german Climate Computing Centre (DKRZ), the Australian National University (ANU) National Computational Infrastructure (NCI), Institut Pierre-Simon Laplace (IPSL), and the British Atmospheric Data Center (BADC). Its main mission is to support current CMIP5 activities and prepare for future assesments. The ESGF architecture is based on a system of autonomous and distributed nodes, which interoperate through common acceptance of federation protocols and trust agreements. Data is stored at multiple nodes around the world, and served through local data and metadata services. Nodes exchange information about their data holdings and services, trust each other for registering users and establishing access control decisions. The net result is that a user can use a web browser, connect to any node, and seamlessly find and access data throughout the federation. This type of collaborative working organization and distributed architecture context en-lighted the need of integration and testing processes definition to ensure the quality of software releases and interoperability. This presentation will introduce the ESGF project and demonstrate the range of tools and processes that have been set up to support release management activities.

  20. The HIX Galaxy Survey: The Most HI Rich Galaxies In The Southern Hemisphere

    NASA Astrophysics Data System (ADS)

    Lutz, Katharina

    2016-10-01

    When comparing the gas content of galaxies with their current star formation rate, it has been found that the gas consumption time scale is much smaller than the age of galaxies. In addition, the metallicity within galaxies is much smaller than expected from closed box modelling of galaxies. These discrepancies suggest that galaxies must replenish their gas reservoirs by accretion of metal-poor gas from the intergalactic medium.In order to investigate this process of gas accretion in more detail we target local galaxies that host an atomic hydrogen (HI) disc at least 2.5 times more massive than expected from their optical properties using scaling relations. For this sample of galaxies, we have been collecting a multiwavelength data set consisting of deep ATCA HI interferometry, ANU SSO 2.3m WiFeS optical integral field spectroscopy and publicly available photometry from GALEX (ultraviolet), WISE and 2MASS (both infrared).We find that these galaxies are normal star-forming spiral galaxies. However, their specific angular momentum is higher than in control galaxies, which allows these galaxies to support a massive HI disc.With the help of the HI interferometry and the optical IFU spectra, we are searching for signs of recent gas accretion. These signs may include among other things non-circular motion of HI, warped or lopsided HI discs, both of which can be identified through tilted-ring modelling of the HI disc or inhomogeneities in the IFU-based metallicity maps.In my talk I will first compare the HI rich galaxies to the control sample and the general galaxy population. I will then move on to the most HI massive galaxy in our sample and discuss its HI kinematics and its gas-phase oxygen abundance distribution in more detail. To conclude I will give an outlook on the more detailed HI kinematics of the remaining HI rich sample.

  1. A large-format imager for the SkyMapper Survey Telescope

    NASA Astrophysics Data System (ADS)

    Granlund, A.; Conroy, P. G.; Keller, S. C.; Oates, A. P.; Schmidt, B.; Waterson, M. F.; Kowald, E.; Dawson, M. I.

    2006-06-01

    The Research School of Astronomy and Astrophysics (RSAA) of the Australian National University (ANU) at Mt Stromlo Observatory is developing a wide-field Cassegrain Imager for the new 1.3m SkyMapper Survey Telescope under construction for Siding Spring Observatory, NSW, Australia. The Imager features a fast-readout, low-noise 268 Million pixel CCD mosaic that provides a 5.7 square degree field of view. Given the close relative sizes of the telescope and Imager, the work is proceeding in close collaboration with the telescope's manufacturer, Electro Optics Systems Pty Ltd (Canberra, Australia). The design of the SkyMapper Imager focal plane is based on E2V (Chelmsford, UK) deep depletion CCDs. These devices have 2048 x 4096 15 micron pixels, and provide a 91% filling factor in our mosaic configuration of 4 x 8 chips. In addition, the devices have excellent quantum efficiency from 300nm-950nm, near perfect cosmetics, and low-read noise, making them well suited to the all-sky ultraviolet through near-IR Southern Sky Survey to be conducted by the telescope. The array will be controlled using modified versions of the new IOTA controllers being developed for Pan-STARRS by Onaka and Tonry et al. These controllers provide a cost effective, low-volume, high speed solution for our detector read-out requirements. The system will have an integrated 6-filter exchanger, and Shack-Hartmann optics, and will be cooled by closed-cycle helium coolers. This paper will present the specifications, and opto-mechanical and detector control design of the SkyMapper Imager, including the test results of the detector characterisation and manufacturing progress.

  2. Biorefinery Technologies for Biomass Conversion Into Chemicals and Fuels Towards Zero Emissions (Review) / Nulles Emisiju Princips Biomasas Konversijas Tehnoloģijās Aizstājot Fosilos Resursus (Pārskata Raksts)

    NASA Astrophysics Data System (ADS)

    Gravitis, J.; Abolins, J.

    2013-10-01

    Exhausting of world resources, increasing pollution, and climate change are compelling the shift of the world economy from continuous growth to a kind of economy based on integration of technologies into zero emissions production systems. Transition from non-renewable fossil resources to renewable resources provided by solar radiation and the current processes in biosphere is seen in the bio-refinery approach - replacing crude oil refineries by biomass refineries. Biotechnology and nano-technologies are getting accepted as important players along with conventional biomass refinery technologies. Systems design is a significant element in the integration of bio-refinery technologies in clusters. A number of case-studies, steam explosion auto-hydrolysis (SEA) in particular, are reviewed to demonstrate conversion of biomass into value-added chemicals and fuels. Analysis of energy flows is made as part of modelling the SEA processes, the eMergy (energy memory) approach and sustainability indices being applied to assess environmental impacts. Resursu izsīkums, vides piesārņojums un globāla mēroga klimatiskās izmaiņas ir civilizācijas izdzīvošanai būtiski faktori, kas virza pasaules ekonomikas pārmaiņas, atsakoties no nepārtrauktas izaugsmes idejas par labu tādai ekonomikai, kas balstās uz atjaunojošamies resursiem un dažādu tehnoloģiju integrācijemisiju principam atbilstošās ražošanas sistēmās. Saules radiācijas ierosinātajos planētas biosfērā notiekošajos procesos radīto organisko vielu pārstrādes kompleksi, kas operē ievērojot sabalansētu nulles emisiju principu, tiek uzlūkoti kā tās ekonomiskās (ražošanas) struktūras, kurām jānodrošina pāreja uz atjaunojošos resursu izmantošanu, aizstājot esošās fosilo resursu (naftas, ogļu) pārstrādes rūpnīcas. Līdzās jau apgūtajām biomasas rafinēšanas tehnoloģijām svarīga un pieaugoša loma ekonomiskās sistēmas resursu bāzes nomaiņā ir bio- un nanotehnolo

  3. Wear Calculation for Sliding Friction Pairs

    NASA Astrophysics Data System (ADS)

    Springis, G.; Rudzitis, J.; Avisane, A.; Leitans, A.

    2014-04-01

    One of the principal objectives of modern production process is the improvement of quality level; this means also guaranteeing the required service life of different products and increase in their wear resistance. To perform this task, prediction of service life of fitted components is of crucial value, since with the development of production technologies and measuring devices it is possible to determine with ever increasing precision the data to be used also in analytical calculations. Having studied the prediction theories of wear process that have been developed in the course of time and can be classified into definite groups one can state that each of them has shortcomings that might strongly impair the results thus making unnecessary theoretical calculations. The proposed model for wear calculation is based on the application of theories from several branches of science to the description of 3D surface micro-topography, assessing the material's physical and mechanical characteristics, substantiating the regularities in creation of the material particles separated during the wear process and taking into consideration definite service conditions of fittings. ums Mūsdienu ražošanas procesa viens no pamatmērķiem ir produkcijas kvalitātes līmeņa paaugstināšana, tas nozīmē arī dažādu izstrādājumu nepieciešamā kalpošanas laika nodrošināšanu un nodilumizturības palielināšanu. Svarīga loma šī uzdevuma sasniegšanā ir salāgojamo detaļu kalpošanas laika prognozēšanai, kas ir ļoti aktuāls jautājums, jo attīstoties dažādām ražošanas, kā arī mēriekārtu tehnoloģijām, kļūst iespējams arvien precīzāk noteikt nepieciešamos datus, kuri vēlāk tiek izmantoti arī analītiskajos aprēķinos. Apskatot laika gaitā izstrādātās dilšanas procesa prognozēšanas teorijas, kuras var klasificēt, apkopojot tās noteiktās grupās, ņemot par pamatu līdzīgas teorētiskās pieejas, jāsaka, ka katrai no tām piemīt da

  4. Inverting Glacial Isostatic Adjustment with Paleo Sea Level Records using Bayesian Framework and Burgers Rheology

    NASA Astrophysics Data System (ADS)

    Caron, L.; Metivier, L.; Greff-Lefftz, M.; Fleitout, L.; Rouby, H.

    2015-12-01

    Glacial Isostatic Adjustment models most often assume a mantle with a viscoelastic Maxwell rheology and a given ice history model. Here we use a Bayesian Monte Carlo with Markov Chains formalism to invert the global GIA signal simultaneously for the mechanical properties of the mantle and for the volume of the various ice-sheets using as starting ice models two distinct previously published ice histories. Burgers as well as Maxwell rheologies are considered.The fitted data consist of 5720 paleo sea level records from the last 35kyrs, with a world-wide distribution. Our ambition is to present not only the best fitting model, but also the range of possible solutions (within the explored space of parameters) with their respective probability of explaining the data, and thus reveal the trade-off effects and range of uncertainty affecting the parameters. Our a posteriori probality maps exhibit in all cases two distinct peaks: both are characterized by an upper mantle viscosity around 5.1020Pa.s but one of the peaks features a lower mantle viscosity around 3.1021Pa.s while the other indicates lower mantle viscosity of more than 1.1022Pa.s. The global maximum depends upon the starting ice history and the chosen rheology: the first peak (P1) has the highest probability only in the case with a Maxwell rheology and ice history based on ICE-5G, while the second peak (P2) is favored when using ANU-based ice history or Burgers rheology, and is our preferred solution as it is also consistent with long-term geodynamics and gravity gradients anomalies over Laurentide. P2 is associated with larger volumes for the Laurentian and Fennoscandian ice-sheets and as a consequence of total ice volume balance, smaller volumes for the Antactic ice-sheet. This last point interfers with the estimate of present-day ice-melting in Antarctica from GRACE data. Finally, we find that P2 with Burgers rheology favors the existence of a tectosphere, i.e. a viscous sublithospheric layer.

  5. A preliminary report on noble gas isotope analyses using the Helix-MC multi-collector mass spectrometer

    NASA Astrophysics Data System (ADS)

    Honda, M.; Zhang, X.; Phillips, D.; Szczepanski, S.; Deerberg, M.; Hamilton, D.; Krummen, M.; Schwieters, J.

    2013-12-01

    Analyses of noble gas isotopes by multi-collector mass spectrometry substantially improve measurement precision and accuracy, with the potential to revolutionise applications to cosmo-geo-sciences. The Helix-MC noble gas mass spectrometer manufactured by Thermo-Fisher is a 350mm, 120 degree extended geometry, high resolution, multi-collector mass spectrometer for the simultaneous analysis of noble gas isotopes. The detector array includes a fixed axial (Ax) detector, 2 adjustable high mass (H1 and H2) detectors and 2 adjustable low mass (L1 and L2) detectors. Each detector is equipped with a Faraday/ion counting multiplier CFM (Combined Faraday and CDD Multiplier) detector. Mass resolution and mass resolving power on the H2, Ax and L2 detectors of the Helix-MC installed at the Australian National University (ANU) are approximately 1,800 and 8,000, respectively. The noble gas handling system on-line to the Helix-MC consists of: (1) a resistively-heated, double-vacuum, tantalum furnace system, (2) air actuated vacuum crusher, (3) Photon-Machines diode laser heating system, (4) Janis He cryogenic trap assembly, (5) gas purification system and (6) standard gas pipette tanks, which are totally automated and controlled by the Qtegra software platform developed by Thermo-Fisher. Eleven repeat measurements of atmospheric Ar using the H2 Faraday (1E11 ohm resistor) and L2 CDD collectors on the Helix-MC, yield a mean 40Ar/36Ar ratio of 322.09 +- 0.28 (0.089%) with a 4,700 fA 40Ar beam current. This result compares favourably with the precision achieved by the Argus VI at the University of Melbourne (318.12 +- 0.17; 0.052%; n = 10) with a similar beam size of 4,200 fA. The high mass resolution of the L2 collector permits complete separation of the 36Ar and interfering 3 x 12C (required mass resolution (MR) of 1,100) and partial separation of H35Cl (MR = 3,900). This capability enables evaluation of the significance of Ar isotopic interferences related to the correction of

  6. The Fractionation of Sulfur Isotopes during Arc Initiation - Preliminary Data

    NASA Astrophysics Data System (ADS)

    Brandl, P. A.; Ireland, T. R.; O'Neill, H. S.

    2014-12-01

    The "Stable Isotope Sensitive High-Resolution Ion Microprobe" (SHRIMP-SI) at the ANU in Canberra provides a powerful tool for in-situ analyses of light isotopes. Recently, we developed a technique to analyze the sulfur isotope composition (δ34S) of volcanic glasses. Since no interlaboratory reference material is available for this purpose, we carried out piston cylinder experiments to create artificial glasses of known sulfur isotope composition. We used natural sulfides mixed with CaO-Al2O3-SiO2 (with PtO2 in 5 mm Pt capsule) and high-Ti Mare basalt powder (graphite capsule inside the Pt capsule). Experimental conditions were set to 1400°C, 5 kbar and 4 hours. We used these artificial glasses to survey sulfur isotope fractionation during our experimental runs and for use as standard material with calibrated δ34S. Additionally, natural standards Juan de Fuca basalt (VG-2), Makaopuhi basalt (VG-A99; Hawai'i), SEIR MORB (NMNH 113716), and one rhyolite (VG-568) were analyzed repeatedly to provide sulfur isotope data of commonly used natural glass standards. IODP expedition 351 to the Amami-Sankaku Basin adjacent to the Kyushu-Palau Ridge in June-July 2014 recovered a variety of rocks related to the history of the Izu-Bonin Mariana (IBM) Arc. Basalts of the oceanic igneous crust underlying the IBM arc give us information of the basement prior to arc initiation and volcaniclastic rocks eroded from active volcanoes of the IBM arc record its evolution from inception in the Eocene through Oligocene and Miocene. Ash layers intercalated in hemipelagic sediments record the evolution of the IBM and Ryukyu arcs during the Neogene. The aim of this study is to track changes in the oxidation state of island arc magmas and the mantle wedge during the time of arc initiation. Experimental results as well as preliminary data from IODP Exp. 351 will be presented by the time of the conference.

  7. Exploiting Data Intensive Applications on High Performance Computers to Unlock Australia's Landsat Archive

    NASA Astrophysics Data System (ADS)

    Purss, Matthew; Lewis, Adam; Edberg, Roger; Ip, Alex; Sixsmith, Joshua; Frankish, Glenn; Chan, Tai; Evans, Ben; Hurst, Lachlan

    2013-04-01

    Australia's Earth Observation Program has downlinked and archived satellite data acquired under the NASA Landsat mission for the Australian Government since the establishment of the Australian Landsat Station in 1979. Geoscience Australia maintains this archive and produces image products to aid the delivery of government policy objectives. Due to the labor intensive nature of processing of this data there have been few national-scale datasets created to date. To compile any Earth Observation product the historical approach has been to select the required subset of data and process "scene by scene" on an as-needed basis. As data volumes have increased over time, and the demand for the processed data has also grown, it has become increasingly difficult to rapidly produce these products and achieve satisfactory policy outcomes using these historic processing methods. The result is that we have been "drowning in a sea of uncalibrated data" and scientists, policy makers and the public have not been able to realize the full potential of the Australian Landsat Archive and its value is therefore significantly diminished. To overcome this critical issue, the Australian Space Research Program has funded the "Unlocking the Landsat Archive" (ULA) Project from April 2011 to June 2013 to improve the access and utilization of Australia's archive of Landsat data. The ULA Project is a public-private consortium led by Lockheed Martin Australia (LMA) and involving Geoscience Australia (GA), the Victorian Partnership for Advanced Computing (VPAC), the National Computational Infrastructure (NCI) at the Australian National University (ANU) and the Cooperative Research Centre for Spatial Information (CRC-SI). The outputs from the ULA project will become a fundamental component of Australia's eResearch infrastructure, with the Australian Landsat Archive hosted on the NCI and made openly available under a creative commons license. NCI provides access to researchers through significant HPC

  8. Uncertainty of GIA models across the Greenland

    NASA Astrophysics Data System (ADS)

    Ruggieri, Gabriella

    2013-04-01

    In the last years various remote sensing techniques have been employed to estimate the current mass balance of the Greenland ice sheet (GIS). In this regards GRACE, laser and radar altimetry observations, employed to constrain the mass balance, consider the glacial isostatic adjustment (GIA) a source of noise. Several GIA models have been elaborated for the Greenland but they differ from each other for mantle viscosity profile and for time history of ice melting. In this work we use the well know ICE-5G (VM2) ice model by Peltier (2004) and two others alternative scenarios of ice melting, ANU05 by Lambeck et al. (1998) and the new regional ice model HUY2 by Simpson et al. (2009) in order to asses the amplitude of the uncertainty related to the GIA predictions. In particular we focus on rates of vertical displacement field, sea surface variations and sea-level change at regional scale. The GIA predictions are estimated using an improved version of SELEN code that solve the sea-level equation for a spherical self-gravitating, incompressible and viscoelastic Earth structure. GIA uncertainty shows a highly variable geographic distribution across the Greenland. Considering the spatial pattern of the GIA predictions related to the three ice models, the western sector of the Greenland Ice Sheets (GrIS) between Thule and Upernavik and around the area of Paamiut, show good agreement while the northeast portion of the Greenland is characterized by a large discrepancy of the GIA predictions inferred by the ice models tested in this work. These differences are ultimately the consequence of the different sets of global relative sea level data and modern geodetic observations used by the authors to constrain the model parameters. Finally GPS Network project (GNET), recently installed around the periphery of the GrIS, are used as a tool to discuss the discrepancies among the GIA models. Comparing the geodetic analysis recently available, appears that among the GPS sites the

  9. Radiation Halos, a Rare Microstructure in Diamonds From the Central African Republic

    NASA Astrophysics Data System (ADS)

    Vicenzi, E. P.; Heaney, P. J.; Snyder, K.; Armstrong, L.

    2002-05-01

    . Preliminary data are consistent with a single pulse of uranium deposition in CAR carbonado. [1] Ozima et al. 1991, Nature 351 : 472. [2] Mendelssohn et al. 1979, Diamond Research:35. [3] Milledge et al. 1998, 7th Intl. Kimberlite Conf: 589. [4] Magee 2001, Ph.D. ANU 247p.

  10. A Search for Rings, Moons, or Debris in the Pluto System during the 2006 July 12 Occultation

    NASA Astrophysics Data System (ADS)

    Pasachoff, Jay M.; Babcock, B. A.; Souza, S. P.; Gangestad, J. W.; Jaskot, A. E.; Elliot, J. L.; Gulbis, A. A.; Person, M. J.; Kramer, E. A.; Adams, E. R.; Zuluaga, C. A.; Pike, R. E.; Francis, P. J.; Lucas, R.; Bosh, A. S.; Ramm, D. J.; Greenhill, J. G.; Giles, A. B.; Dieters, S. W.

    2006-09-01

    We examined our data runs from four sites for the 2006 July 12 occultation of the star P384.2 (McDonald & Elliot, AJ 120, 1599, 2000; UCAC2 26039859), to search for moons, rings, or other debris in the Pluto system. Our data runs extended 80 minutes, or 115,200 km. Motivated by the discovery of P1 (Hydra) and P2 (Nix), each approximately 50 km in diameter and thought to result from the same collision that formed Charon, S. A. Stern et al. (Nature 439, 946-948, 2006) suggested that such matter might be detectable. Though their first estimate was unobservably low at 5×10-6, it could change by a factor of 10,000 or more in either direction (Stern, private communication). Our cloudless data sets, in declining order of S/N, used our Portable Occultation, Eclipse, and Transit Systems (POETS; Souza et al., in preparation) and include those from the 2.3-m ANU telescope at Siding Spring, Australia; 0.8-m Black Springs telescope near Adelaide, and the 1.8-m EOS telescope at Mt. Stromlo; though the atmospheric observation time at the 1-m Mt. Canopus Telescope at Hobart could be recovered from the comparison stars, cloudy intervals prevent full recovery during the ring/debris possible interval. Our observing with the 1-m Mt. John University Observatory in New Zealand was rendered impossible by the lack of electricity resulting from a major snowstorm. For the ring/debris search, we also evaluated data from past Pluto (Pasachoff et al., AJ 129, 1718-1723, 2005) and Charon (Gulbis et al., Nature 439, 48-51, 2006) occultations. See also Elliot et al. and Gulbis et al. (this meeting). We thank Ian Ritchie of Electro Optic Systems (Mt. Stromlo Observatory), Ian Bedford, Lyndon Hemer, and Fraser Farrell (Black Springs Observatory), and Blair Lade (Stockport Observatory). This work was partially supported by NASA Planetary Astronomy Grants NNH04ZSS001N, NNG04GE48G, and NNG04GF25G.

  11. Atmospheric 21Ne abundance determined by the Helix-MC Plus mass spectrometer

    NASA Astrophysics Data System (ADS)

    Honda, M.; Zhang, X.; Phillips, D.; Hamilton, D.; Deerberg, M.; Schwieters, J. B.

    2014-12-01

    Analyses of noble gas isotopes by multi-collector, high resolution mass spectrometry have the potential to revolutionise applications in the cosmo-geo-sciences. The Helix-MC Plus noble gas mass spectrometer installed at the Australian National University (ANU) is equipped with unique high mass resolution collectors [mass resolution (MR): ~1,800 and mass resolving power (MRP): ~8,000], including fixed axial (Ax), adjustable high mass (H2) and adjustable low mass (L2) detectors. The high mass resolution of the L2, Ax and H2 collectors permits complete separation of 20Ne (measured on L2 detector) from doubly charged interfering 40Ar (required MR of 1,777), 1H19F (MR = 1450), 1H218O (MR = 894) and partial separation of the 21Ne peak (on Ax detector) from interfering 20Ne1H (MR = 3,271), and 22Ne (on H2 detector) from interfering doubly charged CO2 (MR = 6,231). Because of the high MRP of ~8,000, 21Ne can be measured, essentially without interference from 20Ne1H, by setting the magnet position on a 20Ne1H interference-free position. This capability provides an important opportunity to re-evaluate the 21Ne abundance in the atmosphere. Our analyses demonstrate that 20Ne1H contributes ~4% to atmospheric 21Ne measurements, with the corresponding production ratio of 20Ne1H to 20Ne being ~1E-4. We calculate a new atmospheric 21Ne/20Ne ratio of 0.00287 relative to an atmospheric 22Ne/20Ne ratio of 0.102; this new value is distinctly lower than the current IUPAC recommended 21Ne/20Ne value of 0.00298. There are several significant implications ensuing from the newly determined atmospheric 21Ne abundance. For example, in the area of Earth sciences the most critical issue relates to cosmogenic 21Ne surface exposure ages, which involve the calculation of 21Ne concentrations from excess 21Ne, relative to the atmospheric 21Ne/20Ne ratio. For young samples, where cosmogenic 21Ne contents are small and the 21Ne/20Ne ratio is close to the atmospheric value, the revised value could

  12. pOsNAR2.1:OsNAR2.1 expression enhances nitrogen uptake efficiency and grain yield in transgenic rice plants.

    PubMed

    Chen, Jingguang; Fan, Xiaoru; Qian, Kaiyun; Zhang, Yong; Song, Miaoquan; Liu, Yu; Xu, Guohua; Fan, Xiaorong

    2017-02-22

    The nitrate (NO3-) transporter has been selected as an important gene maker in the process of environmental adoption in rice cultivars. In this work, we transferred another native OsNAR2.1 promoter with driving OsNAR2.1 gene into rice plants. The transgenic lines with exogenous pOsNAR2.1:OsNAR2.1 constructs showed enhanced OsNAR2.1 expression level, compared with wild type (WT), and (15) N influx in roots increased 21%-32% in response to 0.2 mm and 2.5 mm 15NO3- and 1.25 mm (15) NH4(15) NO3 . Under these three N conditions, the biomass of the pOsNAR2.1:OsNAR2.1 transgenic lines increased 143%, 129% and 51%, and total N content increased 161%, 242% and 69%, respectively, compared to WT. Furthermore in field experiments we found the grain yield, agricultural nitrogen use efficiency (ANUE), and dry matter transfer of pOsNAR2.1:OsNAR2.1 plants increased by about 21%, 22% and 21%, compared to WT. We also compared the phenotypes of pOsNAR2.1:OsNAR2.1 and pOsNAR2.1:OsNRT2.1 transgenic lines in the field, found that postanthesis N uptake differed significantly between them, and in comparison with the WT. Postanthesis N uptake (PANU) increased approximately 39% and 85%, in the pOsNAR2.1:OsNAR2.1 and pOsNAR2.1:OsNRT2.1 transgenic lines, respectively, possibly because OsNRT2.1 expression was less in the pOsNAR2.1:OsNAR2.1 lines than in the pOsNAR2.1:OsNRT2.1 lines during the late growth stage. These results show that rice NO3(-) uptake, yield and NUE were improved by increased OsNAR2.1 expression via its native promoter.

  13. The physics and kinematics of the evolved, interacting planetary nebula PN G342.0-01.7

    NASA Astrophysics Data System (ADS)

    Ali, A.; Amer, M. A.; Dopita, M. A.; Vogt, F. P. A.; Basurah, H. M.

    2015-11-01

    Integral field spectroscopy has been obtained for very few evolved planetary nebulae (PNe). Here we aim to study the physical and kinematical characteristics of the unstudied old planetary nebula PN G342.0-01.7, which shows evidence of interaction with its surrounding interstellar medium. We used integral field spectra from the Wide Field Spectrograph on the ANU 2.3 m telescope to provide spectroscopy across the whole object covering the spectral range 3400-7000 Å. We formed narrow-band images to investigate the excitation structure. The spectral analysis shows that the object is a distant Peimbert Type I planetary nebula (PN) of low excitation, formally of excitation class of 0.5. The low electron density, high dynamical age, and low surface brightness of the object confirm that it is observed fairly late in its evolution. It shows clear evidence for dredge-up of CN-processed material characteristic of its class. In addition, the low peculiar velocity of 7 km s-1 shows it to be a member of the young disk component of our Galaxy. We further determined an average expansion velocity of Vexp = 20.2 ± 1.3 km s-1, a local standard of rest radial velocity RVLSR = -27.7 ± 1.7 km s-1, and a distance of 2.06 ± 0.6 kpc for the object. We built a self-consistent photoionisation model for the PN matching the observed spectrum, the Hβ luminosity, and the diameter. On the basis of this we derive an effective temperature log Teff ~ 5.05 and luminosity 1.85 < log L< 2.25. The temperature is much higher than might have been expected using the excitation class, proving that this can be misleading in classifying evolved PNe. PN G342.0-01.7 is in interaction with its surrounding interstellar medium through which the object is moving in the south-west direction. This interaction drives a slow shock into the outer PN ejecta. A shock model suggests that it only accounts for about 10% of the total luminosity, but has an important effect on the global spectrum of the PN.

  14. Extreme weather impacts on European networks of transport

    NASA Astrophysics Data System (ADS)

    Leviakangas, P.

    2012-04-01

    : Pekka Leviäkangas, Anu Tuominen, Riitta Molarius, Heta Kojo, Jari Schabel, Sirra Toivonen, Jaana Keränen, Johanna Ludvigsen, Andrea Vajda, Heikki Tuomenvirta, Ilkka Juga, Pertti Nurmi, Jenni Rauhala, Frank Rehm, Thomas Gerz, Thorsten Muehlhausen, Juha Schweighofer, Silas Michaelides, Matheos Papadakis, Nikolai Dotzek (†), Pieter Groenemeijer.

  15. The IRHUM database - bioavailable strontium isotope ratios of France for geochemical fingerprinting

    NASA Astrophysics Data System (ADS)

    Willmes, Malte; Moffat, Ian; Grün, Rainer; Armstrong, Richard; Kinsley, Les; McMorrow, Linda

    2013-04-01

    Strontium isotope ratios (87Sr/86Sr) are used as a geochemical tracer in a wide range of fields including archaeology, ecology, soil, food and forensic sciences. These applications are based on the principle that strontium isotopic ratios of materials reflect the geological sources of the strontium, which were available during its formation. Geologic regions with distinct strontium isotope ranges, which depend on their age and composition, can be differentiated. A major constraint for current studies is the lack of robust reference maps to evaluate the strontium isotope ratios measured in the samples. The aim of the IRHUM (isotopic reconstruction of human migration) database is to provide a reference map of bioavailable strontium isotope ratios for continental France. The current dataset contains 400 sample locations covering the major geologic units of the Paris and Aquitaine Basin, the Massif Central, and the Pyrenees. At each site soil and plant samples have been collected to cover the whole range of strontium ratios at a specific location. The database is available online at www.rses.anu.edu.au/research-areas/archaeogeochemistry and contains the bioavailable strontium isotope data as well as major and trace element concentrations for soil and plant samples. Strontium isotopes were analysed using a Neptune multi-collector inductively-coupled plasma mass spectrometer (MC-ICP-MS) and elemental concentrations with a Varian Vista Pro Axial ICP-AES (inductively-coupled plasma atomic emission spectrometer). In addition, IRHUM provides spatial context for each sample, including background geology, field observations and soil descriptions. This metadata allows users to evaluate the suitability of a specific data point for their study. The IRHUM database fills an important gap between high resolution studies from specific sites (e.g. archaeological sites), to the very broad geochemical mapping of Europe. Thus it provides an excellent tool to evaluate the regional context

  16. VizieR Online Data Catalog: Sloan i follow-up light curves of HATS-18 (Penev+, 2016)

    NASA Astrophysics Data System (ADS)

    Penev, K.; Hartman, J. D.; Bakos, G. A.; Ciceri, S.; Brahm, R.; Bayliss, D.; Bento, J.; Jordan, A.; Csubry, Z.; Bhatti, W.; de Val-Borro, M.; Espinoza, N.; Zhou, G.; Mancini, L.; Rabus, M.; Suc, V.; Henning, T.; Schmidt, B.; Noyes, R. W.; Lazar, J.; Papp, I.; Sari, P.

    2017-02-01

    The star HATS-18 was observed by HATSouth instruments between UT 2011 April 18 and UT 2013 July 21 using the HS-2, HS-4, and HS-6 units at the Las Campanas Observatory in Chile, the High Energy Spectroscopic Survey (H.E.S.S.) site in Namibia, and Siding Spring Observatory (SSO) in Australia, respectively. A total of 5372, 3758, and 4008 images of HATS-18 were obtained with HS-2, HS-4, and HS-6, respectively. The observations were obtained through a Sloan r filter with an exposure time of 240s. We obtained follow-up light curves of HATS-18 using the Las Cumbres Observatory Global Telescope (LCOGT) 1m telescope network. An ingress was observed on UT 2015 July 18 with the SBIG camera and a Sloan i filter on the 1m at the South African Astronomical Observatory (SAAO). A total of 33 images were collected at a median cadence of 201s. A full transit was observed on UT 2016 January 22 with the sinistro camera and a Sloan i filter on the 1m at Cerro Tololo Inter-American Observatory. A total of 61 images were collected at a median cadence of 219s. For the record, we also note that a full transit was observed on UT 2016 January 3 with the SBIG camera on the 1m at SAAO; however, due to tracking and weather problems, we were unable to extract high-precision photometry from these images, and therefore do not include these data in our analysis. The data are available in Table1. Spectroscopic follow-up observations of HATS-18 were carried out with WiFeS on the Australian National University (ANU) 2.3m telescope and with the Fiber-fed Extended Range Optical Spectrograph (FEROS) on the MPG 2.2m. A total of three spectra were obtained with WiFeS between UT 2015 February 28 and UT 2015 March 2, two at a resolution of R=Δλ/λ=7000, and one at R=3000. We obtained six R=48000 spectra with FEROS between UT 2015 June 12 and UT 2015 June 20. The data are provided in Table2. (2 data files).

  17. Bioinspired Engineering of Exploration Systems (BEES) - its Impact on Future Missions

    NASA Technical Reports Server (NTRS)

    Thakoor, Sarita; Hine, Butler; Zornetzer, Steve

    2004-01-01

    This paper describes an overview of our "Bioinspired Engineering of Exploration Systems for Mars" ( "BEES for Mars") project. The BEES approach distills selected biologically inspired strategies utilizing motion cues/optic flow, bioinspired pattern recognition, biological visual and neural control systems, bioinspired sensing and communication techniques, and birds of prey inspired search and track algorithmic systems. Unique capabilities so enabled, provide potential solutions to future autonomous robotic space and planetary mission applications. With the first series of tests performed in September 2003, August 2004 and September 2004, we have demonstrated the BEES technologies at the El Mirage Dry Lakebed site in the Mojave Desert using Delta Wing experimental prototypes. We call these test flyers the "BEES flyer", since we are developing them as dedicated test platform for the newly developed bioinspired sensors, processors and algorithmic strategies. The Delta Wing offers a robust airframe that can sustain high G launches and offers ease of compact stowability and packaging along with scaling to small size and low ReynOld's number performance for a potential Mars deployment. Our approach to developing light weight, low power autonomous flight systems using concepts distilled from biology promises to enable new applications, of dual use to NASA and DoD needs. Small in size (0.5 -5 Kg) BEES Flyers are demonstrating capabilities for autonomous flight and sensor operability in Mars analog conditions. The BEES project team spans JPL, NASA Ames, Australian National University (ANU), Brigham Young University(BYU), DC Berkeiey, Analogic Computers Inc. and other institutions. The highlights from our recent flight demonstrations exhibiting new Mission enabling capabilities are described. Further, this paper describes two classes of potential new missions for Mars exploration: (1) the long range exploration missions, and (2) observation missions, for real time imaging of

  18. Glacial isostatic adjustment using GNSS permanent stations and GIA modelling tools

    NASA Astrophysics Data System (ADS)

    Kollo, Karin; Spada, Giorgio; Vermeer, Martin

    2013-04-01

    Glacial Isostatic Adjustment (GIA) affects the Earth's mantle in areas which were once ice covered and the process is still ongoing. In this contribution we focus on GIA processes in Fennoscandian and North American uplift regions. In this contribution we use horizontal and vertical uplift rates from Global Navigation Satellite System (GNSS) permanent stations. For Fennoscandia the BIFROST dataset (Lidberg, 2010) and North America the dataset from Sella, 2007 were used respectively. We perform GIA modelling with the SELEN program (Spada and Stocchi, 2007) and we vary ice model parameters in space in order to find ice model which suits best with uplift values obtained from GNSS time series analysis. In the GIA modelling, the ice models ICE-5G (Peltier, 2004) and the ice model denoted as ANU05 ((Fleming and Lambeck, 2004) and references therein) were used. As reference, the velocity field from GNSS permanent station time series was used for both target areas. Firstly the sensitivity to the harmonic degree was tested in order to reduce the computation time. In the test, nominal viscosity values and pre-defined lithosphere thicknesses models were used, varying maximum harmonic degree values. Main criteria for choosing the suitable harmonic degree was chi-square fit - if the error measure does not differ more than 10%, then one might use as well lower harmonic degree value. From this test, maximum harmonic degree of 72 was chosen to perform calculations, as the larger value did not significantly modify the results obtained, as well the computational time for observations was kept reasonable. Secondly the GIA computations were performed to find the model, which could fit with highest probability to the GNSS-based velocity field in the target areas. In order to find best fitting Earth viscosity parameters, different viscosity profiles for the Earth models were tested and their impact on horizontal and vertical velocity rates from GIA modelling was studied. For every

  19. Long-Term Performance of Pb Isotopic Analysis by TIMS with 202Pb-205Pb Double Spike

    NASA Astrophysics Data System (ADS)

    Amelin, Y.; Connelly, J. N.

    2008-05-01

    The 202Pb-205Pb-233U-235U spike (Pb DS), prepared at the Geological Survey of Canada in 2005 [1], and the 202Pb-205Pb-235U spike, prepared at the Department of Geosciences, University of Oslo [2], have been used for more than two years. Both spikes are routinely used for TIMS analysis of Pb with internal fractionation correction for U-Pb dating of various rocks and minerals, including dating perovskite [2] and meteorites and their components [1, 4-7]. A few hundred standard and sample Pb DS analyses were acquired with these two spikes using Triton TI mass spectrometers at the Geological Survey of Canada, US Geological Survey and the Australian National University, a Finnigan-MAT 261 mass spectrometer at The University of Texas at Austin and a Finnigan-MAT 262 mass spectrometer at the University of Oslo. All analyses were performed using high efficiency silicic acid emitter [8] and a static multicollector mode if the samples were sufficiently large to produce an ion beam greater than ca. 2-5×10-14 A on 206Pb and 207Pb. These data allow us to evaluate long - term performance of the Pb DS procedure for sub-nanogram samples of Pb. The performance of this procedure is evaluated on the basis of the long-term reproducibility of analyses of isotopic standards, and from improving quality of linear fits in Pb-Pb isochron diagrams (and, hence, improved precision of ages) compared to the same data reduced using external normalization. The data for 0.3 ng loads of SRM-981, analyzed with the batches of samples in 2006 and 2007 at the GSC, yield the mean 204Pb/206Pb of 0.05904±0.00013 (0.226% 2σ), #207Pb/206Pb of 0.91483±0.00018 (0.020% 2σ)), and 208Pb/206Pb of 2.16771±0.00054 (0.025% 2σ)). These values and errors are similar to those reported in [1] for the loads of the same size, and to the values obtained for similar loads at the USGS and at ANU over shorter periods of time. The precision and reproducibility of sample analysis and standard analyses is similar, and

  20. Greater carbon stocks and faster turnover rates with increasing agricultural productivity

    NASA Astrophysics Data System (ADS)

    Sanderman, J.; Fallon, S.; Baisden, T. W.

    2013-12-01

    H.H. Janzen (2006) eloquently argued that from an agricultural perspective there is a tradeoff between storing carbon as soil organic matter (SOM) and the soil nutrient and energy benefit provided during SOM mineralization. Here we report on results from the Permanent Rotation Trial at the Waite Agricultural Institute, South Australia, indicating that shifting to an agricultural management strategy which returns more carbon to the soil, not only leads to greater carbon stocks but also increases the rate of carbon cycling through the soil. The Permanent Rotation Trial was established on a red Chromosol in 1925 with upgrades made to several treatments in 1948. Decadal soil samples were collected starting in 1963 at two depths, 0-10 and 10-22.5 cm, by compositing 20 soil cores taken along the length of each plot. We have chosen to analyze five trials representing a gradient in productivity: permanent pasture (Pa), wheat-pasture rotation (2W4Pa), continuous wheat (WW), wheat-oats-fallow rotation (WOF) and wheat-fallow (WF). For each of the soil samples (40 in total), the radiocarbon activity in the bulk soil as well as size-fractionated samples was measured by accelerator mass spectrometry at ANU's Radiocarbon Dating Laboratory (Fallon et al. 2010). After nearly 70 years under each rotation, SOC stocks increased linearly with productivity data across the trials from 24 to 58 tC ha-1. Importantly, these differences were due to greater losses over time in the low productivity trials rather than gains in SOC in any of the trials. Uptake of the bomb-spike in atmospheric 14C into the soil was greatest in the trials with the greatest productivity. The coarse size fraction always had greater Δ14C values than the bulk soil samples. Several different multi-pool steady state and non-steady state models were used to interpret the Δ14C data in terms of SOC turnover rates. Regardless of model choice, either the decay rates of all pools needed to increase or the allocation of C to

  1. Obtaining a Well-Aligned ZnO Nanotube Array Using the Hydrothermal Growth Method / Labi Sakārtotu Zno Nanocauruļu Kopu Iegūšana, Izmantojot Hidrotermālo Metodi

    NASA Astrophysics Data System (ADS)

    Krasovska, M.; Gerbreders, V.; Paskevics, V.; Ogurcovs, A.; Mihailova, I.

    2015-10-01

    Optimal growing parameters have been found using the hydrothermal method to obtain well-aligned vertical ZnO nanorod and nanotube arrays. The influence of different growing factors (such as temperature, growing solution concentration, method of obtaining seed layer and condition) on nanotube morphology and size is described in the paper. Well-structured ZnO nanotubes have been obtained by using a selfselective etching method with lowering temperatures of growth during the hydrothermal process. It is shown that the optical properties of the nanostructure arrays obtained are sensitive to the medium in which they are placed, which is why they can be used as sensors for pure substance detection and in different solutions for impurity determination. Dotajā darbā tika noteikti optimāli parametri labi sakārtotu ZnO nanocaurulīšu kopu iegūšanai, izmantojot hidrotermālo metodi ar temperatūras pazemināšanu, jeb t.s. selektīvu pa\\vskodināšanas metodi (self-selective etching), ir uzsvērtas šās metodes priekšrocības salīdzinājumā ar ķīmiskās kodināšanas metodi, kā arī tika aprakstīta dažādu augšanas faktora (tādu, ka darba šķīduma koncentrācija, augšanas temperatūra un laiks, iedīgļu slāņa iegūšanas veids un iegūšanas parametri) ietekme uz iegūtu nanostraktūra morfoloģiju. Tika konstatēts, ka noteicošu lomu ZnO nanocaurulīšu audzēšanas procesā spēlē iedīgļu slāņa graudu izmēri, kas savā staipā nosaka augošu nanostieņu izmērus un to tendenci pie pa\\vskodināšanas. Rentgenogrannnas parāda, ka iegūtām pie noteiktiem parametriem ZnO nanostruktūrām piemīt augsta kristāliskuma pakāpe un sakārtotība vertikālā virzienā. Optiskie mērījumi parāda, ka ZnO nanocauralītes ir jutīgas gan pret tīrām vielām (ūdens, spirts), gan pret dažādiem šķīdumiem, kas ļauj izmantot tos kā pie­jaukumu sensora. Salīdzinājumā ar ZnO nanostieņiem caurulīšu jūtība pieaug, jo pieaug nanostrakt

  2. The GEOSCOPE Program: state of the art in 2007

    NASA Astrophysics Data System (ADS)

    Roult, G.; Stutzmann, E.; Maggi, A.

    2007-05-01

    The GEOSCOPE program was launched in 1982 by the National Institute of Sciences of Universe (INSU), a department of the French National Center of Scientific Research (CNRS), following the initiative of the Institute of Physics of the Earth of Paris (IPGP). The purpose was the installation of about 25 stations well distributed worldwide (in particular in the southern hemisphere), in the standard configuration defined by the FDSN (very broad-band 24 bit, continuous recording at 20sps). At present, the GEOSCOPE program is operating 28 digital 3-component very- broadband stations. In terms of site locations, the aim of the GEOSCOPE program is almost fulfilled. Our purpose is to maintain the stations at original sites (Indian Ocean, Africa) and to fill some geographical gaps at high latitudes in the southern and northern hemisphere. In particular, at high latitudes in Russia, we plan to install a new station VOR (Vorkuta) and to move the station SEY (Seimchan) to a new location in northern Kamchatka. We are also working on improving data quality and transmission. Historically, GEOSCOPE did not operate real- time data. Continuous data from most of stations arrive with significant delays and records from large events are teletransmitted from some stations (by phone RTC line or through internet) and are made available within one day. To improve this situation, we are replacing the old Streckeisen digitizers with new Quanterra data loggers, essentially Q330-HR ones. Presently data from 13 stations are made available at the IPGP Geoscope Data Center in near real-time, with a delay depending on the station: 1- ATD (Arta, Djibouti), a joint CTBTO/CERD/G station 2- CAN (Canberra, Australia), a joint ANU/G station 3- DZM (Dzumac, New Caledonia, a joint DASE/CTBTO/G station 4- ECH (Echery, France) 5- FDF (Fort de France, French West Indies) 6- KIP (Kipapa, Hawai), a joint IRIS/USGS/G station 7- PAF (Port aux Français, Kerguelen Island) 8- RER (Riviere de l'Est , La Reunion) 9

  3. Global review of open access risk assessment software packages valid for global or continental scale analysis

    NASA Astrophysics Data System (ADS)

    Daniell, James; Simpson, Alanna; Gunasekara, Rashmin; Baca, Abigail; Schaefer, Andreas; Ishizawa, Oscar; Murnane, Rick; Tijssen, Annegien; Deparday, Vivien; Forni, Marc; Himmelfarb, Anne; Leder, Jan

    2015-04-01

    Over the past few decades, a plethora of open access software packages for the calculation of earthquake, volcanic, tsunami, storm surge, wind and flood have been produced globally. As part of the World Bank GFDRR Review released at the Understanding Risk 2014 Conference, over 80 such open access risk assessment software packages were examined. Commercial software was not considered in the evaluation. A preliminary analysis was used to determine whether the 80 models were currently supported and if they were open access. This process was used to select a subset of 31 models that include 8 earthquake models, 4 cyclone models, 11 flood models, and 8 storm surge/tsunami models for more detailed analysis. By using multi-criteria analysis (MCDA) and simple descriptions of the software uses, the review allows users to select a few relevant software packages for their own testing and development. The detailed analysis evaluated the models on the basis of over 100 criteria and provides a synopsis of available open access natural hazard risk modelling tools. In addition, volcano software packages have since been added making the compendium of risk software tools in excess of 100. There has been a huge increase in the quality and availability of open access/source software over the past few years. For example, private entities such as Deltares now have an open source policy regarding some flood models (NGHS). In addition, leaders in developing risk models in the public sector, such as Geoscience Australia (EQRM, TCRM, TsuDAT, AnuGA) or CAPRA (ERN-Flood, Hurricane, CRISIS2007 etc.), are launching and/or helping many other initiatives. As we achieve greater interoperability between modelling tools, we will also achieve a future wherein different open source and open access modelling tools will be increasingly connected and adapted towards unified multi-risk model platforms and highly customised solutions. It was seen that many software tools could be improved by enabling user

  4. IPHAS and the symbiotic stars . II. New discoveries and a sample of the most common mimics

    NASA Astrophysics Data System (ADS)

    Corradi, R. L. M.; Valentini, M.; Munari, U.; Drew, J. E.; Rodríguez-Flores, E. R.; Viironen, K.; Greimel, R.; Santander-García, M.; Sabin, L.; Mampaso, A.; Parker, Q.; DePew, K.; Sale, S. E.; Unruh, Y. C.; Vink, J. S.; Rodríguez-Gil, P.; Barlow, M. J.; Lennon, D. J.; Groot, P. J.; Giammanco, C.; Zijlstra, A. A.; Walton, N. A.

    2010-01-01

    WHT telescopes of the Isaac Newton Group of Telescopes in the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofísica de Canarias; the 2.3 m ANU telescope at Siding Spring Observatory, Australia; the Asiago 1.82 m telescope of the INAF Astronomical Observatory of Padova, Italy; and the 2.1 m telescope at San Pedro Martir, Mexico. Some of the INT spectra incorporated into this paper were obtained as part of a CCI International Time Programme awarded to the IPHAS collaboration. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This research has also made use of the SIMBAD database, operated at CDS, Strasbourg, France.

  5. Identity of Innovative Multifunctional Material Manufacturing Business in Latvia / Inovatīvu Daudzfunkcionālo Materiālu Ražotāju Identitāte Latvijā

    NASA Astrophysics Data System (ADS)

    Geipele, I.; Staube, T.; Ciemleja, G.; Zeltins, N.; Ekmanis, Yu.

    2015-08-01

    The publication comprises the results from the practical scientific investigation to define the profile and distinctions of the Latvian innovative multifunctional material manufacturing industry. The research is carried out by a holistic approach, including expert interviews, qualitative analysis of the official register data, practical survey, and financial data analysis. The paper seeks to give the detailed data on a technological profile of the mentioned representative companies, if there is a synergy or tough competition in the Latvian market. The current research is topical, because it is unique and does not have analogues in Latvia, and the research is timely due to correspondence with recently stated Research and Innovation Strategies for Smart Specialisation in Latvia. The main findings are associated with recognition of the factors that make impact on commercialisation of the finished goods, obtained financial results and planned directions of development of the respondent companies. Publikācija sniedz veiktā zinātniski praktiskā pētījuma rezultātus, kura ietvaros tika noteikts Latvijas inovatīvu daudzfunkcionālo materiālu ražotāju darbības profils un identitāte. Pētījumā tika izmantota kompleksās analīzes metode, kas ietvēra ekspertu intervijas, uzņēmumu oficiāli reģistrēto datu kvalitatīvo analīzi, zinātniski praktisko aptauju, kā arī pētāmo uzņēmumu finanšu darbības rezultātu analīzi. Zinātniskais darbs sniedz izsmeļošu informāciju par mērķa uzņēmumu tehnoloģisko profilu un pēta, vai Latvijas mērķa ražošanas nozarē ir sinerģijas vai sīvās konkurences pazīmes. Šim zinātniskajam pētījumam ir noteikta aktualitāte saskaņā ar tā unikalitāti Latvijas valsts mērogā un atbilstība Viedās specializācijas stratēģijai. Pētījuma galvenie secinājumi ir saistīti ar uzņēmumu produkcijas komercializācijas ietekmējošo faktoru apzināšanu, sasniegtajiem finansiālajiem rezultātiem un pl

  6. Projects of High-Temperature Nuclear Reactors

    NASA Astrophysics Data System (ADS)

    Ekmanis, J.; Tomsons, E.; Zeltiņš, N.

    2013-04-01

    Part 2 of the overview gives emphasis to the projects of high-temperature NRs, whose development is an area of active engagement for the specialists from the USA, France, Japan, Russia, China, the Netherlands, and Germany. Projects of several powerful NRs of the HTGR type for commercial use had been worked out in the USA and Germany already by 1970 but not yet implemented. Augstas temperatūras ar gāzes dzesēšanu HTGR (High Temperature Gas cooled Reactor) tipa kodolreaktoru (KR) izstrādes koncepcija bija piedāvāta 1956. gadā Lielbritānijā. Apmēram tanī pašā laikā minētā tipa KR izstrādi uzsāka Vācijā un ASV. HTGR tipa KR kodoldegviela un kodoldegvielas atražošanas materiāla sīkās daļiņas ar diametru apmēram 0.5 mm pārklātas ar vairākām aizsargkārtām un atrodas grafīta neitronu palēninātājā, kas aizsargā daļiņas no neitronu palēninātāja un dzesētāja iedarbes. Augstas temperatūras KR bez hēlija gāzes siltumnesēja var izmantot šķidrus metālus (nātriju, svinu vai svina-bismuta sakausējumu) un izkausētu sāli. Pašlaik darbojās divi augstas temperatūras ar hēlija gāzi dzesēti eksperimentālie HTGR tipa KR. Viens Japānā "HTTR" no 1998. gada oktobra (sākts būvēt 1991. gada 15. martā) ar 30 MWth siltuma jaudu. Otrs Ķīnā "HTR-10" no 2000.gada decembra (sākts būvēt 1995. gada14. jūnijā) ar 10 MWth siltuma jaudu. Ķīnā Shandong provincē 2011.gada aprīlī uzsāka augstas temperatūras "HTR-PM" (High Temperature Gas-cooled Reactor - Pebble bed Module) tipa kodolreaktora celtniecību ar 250 MWth siltuma jaudu. Augstas temperatūras kodolreaktoru izstrādē pašlaik aktīvi iesaistīti ASV, Francijas, Japānas, Krievijas, Ķīnas, Nīderlandes un Vācijas speciālisti.

  7. Latvian Waste Management Modelling in View of Environmental Impact Reduction / Latvijas Atkritumu SAIMNIECĪBAS ATTĪSTĪBA un TĀS RADĪTĀS Ietekmes UZ Vidi SAMAZINĀŠANAS MODELĒŠANA

    NASA Astrophysics Data System (ADS)

    Teibe, I.; Bendere, R.; Arina, D.

    2013-12-01

    In the work, the life-cycle assessment approach is applied to the planning of waste management development in a seaside region (Piejūra) using the Waste Management Planning System (WAMPS) program. In Latvia, the measures to be taken for the climate change mitigation are of utmost importance - especially as related to the WM performance, since a disposal of biodegradable waste presents the primary source of GHG emissions. To reduce the amount of such waste is therefore one of the most significant goals in the State WM plan for 2013-2020, whose adoption is the greatest challenge for municipalities. The authors analyse seven models which involve widely employed biomass processing methods, are based on experimental data and intended for minimising the direct disposal of organic mass at the solid waste landfills. The numerical results obtained evidence that the thermal or biotechnological treatment of organic waste substantially reduces the negative environmental impact of WM practices - by up to 6% as compared with the currently existing. Klimata pārmaiņu samazināšanas pasākumi Latvijā atkritumu saimniecības sektorā ir īpaši svarīgi. jo bioloģiski sadalāmo atkritumu apglabāšana ir viens no būtiskākajiem SEG emisiju avotiem valstī. Pētījumā modelēti virkne sadzīves atkritumu apsaimniekošanas modeļi. kas ietver plašāk izmantotās biomasas pārstrādes metodes un samazina tiešu organiskās masas apglabāšanu cieto sadzīves atkritumu poligonos. Atkritumu apsaimniekošanas modeļu radītās vides ietekmes novērtēšanai izmantota WAMPS (Waste Management Planning System) programma, kas balstīta uz atkritumu apsaimniekošanas procesu dzīves cikla novērtējumu vienā no desmit Latvijas atkritumu apsaimniekošanas reģioniem - Piejūra. Iegūtie kvantitatīvie rezultāti norāda. ka organiskās atkritumu masas pārstrāde un stabilizēšana, izmantojot biotehnoloģijas vai termisko pārstrādi, būtiski samazina atkritumu apsaimniekošanas rad

  8. SciDAC's Earth System Grid Center for Enabling Technologies Semiannual Progress Report October 1, 2010 through March 31, 2011

    SciTech Connect

    Williams, Dean N.

    2011-04-02

    Laboratory (ORNL), Pacific Marine Environmental Laboratory (PMEL)/NOAA, Rensselaer Polytechnic Institute (RPI), and University of Southern California, Information Sciences Institute (USC/ISI). All ESG-CET work is accomplished under DOE open-source guidelines and in close collaboration with the project's stakeholders, domain researchers, and scientists. Through the ESG project, the ESG-CET team has developed and delivered a production environment for climate data from multiple climate model sources (e.g., CMIP (IPCC), CESM, ocean model data (e.g., Parallel Ocean Program), observation data (e.g., Atmospheric Infrared Sounder, Microwave Limb Sounder), and analysis and visualization tools) that serves a worldwide climate research community. Data holdings are distributed across multiple sites including LANL, LBNL, LLNL, NCAR, and ORNL as well as unfunded partners sites such as the Australian National University (ANU) National Computational Infrastructure (NCI), the British Atmospheric Data Center (BADC), the Geophysical Fluid Dynamics Laboratory/NOAA, the Max Planck Institute for Meteorology (MPI-M), the German Climate Computing Centre (DKRZ), and NASA/JPL. As we transition from development activities to production and operations, the ESG-CET team is tasked with making data available to all users who want to understand it, process it, extract value from it, visualize it, and/or communicate it to others. This ongoing effort is extremely large and complex, but it will be incredibly valuable for building 'science gateways' to critical climate resources (such as CESM, CMIP5, ARM, NARCCAP, Atmospheric Infrared Sounder (AIRS), etc.) for processing the next IPCC assessment report. Continued ESG progress will result in a production-scale system that will empower scientists to attempt new and exciting data exchanges, which could ultimately lead to breakthrough climate science discoveries.

  9. Isotopic reconstruction of ancient human migrations: A comprehensive Sr isotope reference database for France and the first case study at Tumulus de Sables, south-western France

    NASA Astrophysics Data System (ADS)

    Willmes, M.; Boel, C.; Grün, R.; Armstrong, R.; Chancerel, A.; Maureille, B.; Courtaud, P.

    2012-04-01

    Strontium isotope ratios (87Sr/86Sr) can be used for the reconstruction of human and animal migrations across geologically different terrains. Sr isotope ratios in rocks are a product of age and composition and thus vary between geologic units. From the eroding environment Sr is transported into the soils, plants and rivers of a region. Humans and animals incorporate Sr from their diet into their bones and teeth, where it substitutes for calcium. Tooth enamel contains Sr isotope signatures acquired during childhood and is most resistant to weathering and overprinting, while the dentine is often diagenetically altered towards the local Sr signature. For the reconstruction of human and animal migrations the tooth enamel 87Sr/86Sr ratio is compared to the Sr isotope signature in the vicinity of the burial site and the surrounding area. This study focuses on the establishment of a comprehensive reference map of bioavailable 87Sr/86Sr ratios for France. In a next step we will compare human and animal teeth from key archaeological sites to this reference map to investigate mobility. So far, we have analysed plant and soil samples from ~200 locations across France including the Aquitaine basin, the western and northern parts of the Paris basin, as well as three transects through the Pyrenees Mountains. The isotope data, geologic background information (BRGM 1:1M), field images, and detailed method descriptions are available through our online database iRhum (http://rses.anu.edu.au/research/ee). This database can also be used in forensic studies and food sciences. As an archaeological case study teeth from 16 adult and 8 juvenile individuals were investigated from an early Bell Beaker (2500-2000 BC) site at Le Tumulus des Sables, south-west France (Gironde). The teeth were analysed for Sr isotope ratios using laser ablation ICP-MS. Four teeth were also analysed using solution ICP-MS, which showed a significant offset to the laser ablation results. This requires further

  10. Development and Experimental Study of Phantoms for Mapping Skin Chromophores

    NASA Astrophysics Data System (ADS)

    Silapetere, A.; Spigulis, J.; Saknite, I.

    2014-06-01

    Skin chromophore phantoms are widely used for better understanding of the light interaction with tissue and for calibration of skin diagnostic imaging techniques. In this work, different phantoms were examined and compared in order to find biologically equivalent substances that are the most promising for this purpose. For mimicking the skin medium and layered structure, a fibrin matrix with epidermal and dermal cell inclusion was used. Synthesized bilirubin, red blood cells and nigrosin were taken as absorbers. For spectral analysis of the developed phantoms a computer-aided multispectral imaging system Nuance 2.4 (Cambridge Research & Instrumentation, Inc., USA) was used. In this study, skin phantoms were created using such substances as bilirubin, melanin, haemoglobin and nigrosin Mūsdienās multispektrālās attēlošanas iekārtas izmanto ādas parametru un fizioloģisko procesu aprakstīšanai gan pētniecības, gan diagnostikas nolūkiem. Iekārtu darbības uzlabošanai ir nepieciešams labāk saprast gaismas mijiedarbību ar audiem, kā arī veikt šo iekārtu kalibrēšanu ar ādas maketu. Redzamā un tuvā infrasarkanā optiskā diapazona spektroskopijā ir svarīgi ādas maketi, kas simulē audu slāņaino struktūru un ķīmiskās īpašības, kā arī maketi, kas ir bioloģiski līdzvērtīgi. Šajā pētījumā tika izveidots ādas makets no bioloģiskām un ķīmiski sintezētām struktūrām. Ādas maketa izveidei tika izmantota fibrīna matrica ar dermālo un epidermālo šūnu piejaukumu, lai imitētu ādas slāņaino struktūru. Fibrīna matrica tiek veidota no 0,47 ml asins plazmas, 0,4 ml fizioloģiskā šķīduma, 0,8 μl treneksāmskābes un 89,4 μl kalcija glukanāta. Izveidoto matricu ievieto šūnu inkubatorā, lai tā polimerizētos. Nākošais slānis tiek veidots ar dermālo šūnu piejaukumu (180-270 šūnas), un pēdējais fibrīna matriksa slānis tiek veidots ar epidermālo šūnu piejaukumu (270 šūnas) un šūnu augšanu

  11. Receiving And Data Acquisition Systems Of Rt-32 For Vlbi Observations / Rt-32 Uztveršanas Un Datu Reģistrācijas Sistēmas Vlbi Novērojumiem

    NASA Astrophysics Data System (ADS)

    Bezrukovs, Vl.; Shmeld, I.; Nechaeva, M.; Trokss, J.; Bezrukovs, D.; Klapers, M.; Berzins, A.; Lesins, A.; Dugin, N.

    2012-12-01

    Radiotelescope RT-32 is a fully steerable 32-m parabolic antenna located at Irbene and belonging to Ventspils International Radio Astronomy Centre (VIRAC). Currently, the work on upgrading and repair of its receiving hardware and data acquisition systems is of high priority for the VIRAC. One of the main scientific objectives for the VIRAC Radioastronomical observatory is VLBI (very long baseline interferometry) observations in centimetre wavelengths in collaboration with world VLBI networks, such as European VLBI network (EVN), Low Frequency VLBI network (LFVN), and others. During the last years the room in the secondary focus of telescope was reconstructed, and several new receivers were installed. Currently, RT-32 observations are carried out in four different bands: 92 cm, 18 cm, 6 cm, and 2.5 cm. First three of them are already successfully employed in diversified VLBI experiments. The receiver on 2.5 cm band has only one linear polarized chain and is used mainly for the methanol maser single dish observations. The apparatus system of RT-32 is equipped with two independent VLBI data acquisition systems: TN-16, and DBBC in combination with MK5b. Both systems are employed in interferometric observations depending on the purpose of experiment and the enabled radiotelescopes. The current status of RT-32, the availability of its receiving and data acquisition units for VLBI observations and the previous VLBI sessions are discussed. Radioteleskops RT-32 ir Ventspils Starptautiskajam Radioastronomijas Centram (VSRC) piederoša pilnas piedziņas 32 m diametra paraboliskā antena. Pašreiz visaktuālākie VSRC veicamie darbi ir saistīti ar RT-32 uztverošās aparatūras un datu reģistrēšanas sistēmas labošanu un modernizāciju. Viens no radioastronomiskās observatorijas galvenajiem zinātniskajiem uzdevumiem ir sevišķi lielas bāzes interferometriskie (VLBI) novērojumi centimetru viļņu garumu diapazonā sadarbībā ar pasaules VLBI tīkla partneriem, t

  12. Chromophore Poling in Thin Films of Organic Glasses. 3. Setup for Corona Triode Discharge / Hromoforu Polarizēšana Plānās Organisko Stiklu Kārtiņās 3. Koronas Izlādes Triodes Ierīce

    NASA Astrophysics Data System (ADS)

    Vilitis, O.; Titavs, E.; Nitiss, E.; Rutkis, M.

    2013-02-01

    The corona discharge is described focusing on the advantages of corona triode techniques for the direct current (DC) positive poling of optical polymers. The proposed experimental setup allows the corona poling of nonlinear optical (NLO) polymers in the modes of DC constant current (the lowest 1nA) and of the fixed corona-grid voltage, making it possible to carry out the corona-onset poling at elevated temperature (COPET) up to 200 oC. The setup also provides a wide range of the corona discharge voltage (3 kV - 15 kV), variable reciprocal distance of electrodes as well as the possibility to choose from different types of the corona electrode (needle, multi-needle, wire, etc.). By keeping the corona-to-grid voltage constant, a stable corona discharge at electrode is attained. The grid voltage can be varied in the range from 0 to 3kV. The corona poling area on the sample surface is pre-defined by placing ring spacers above it. The setup is completely computerized, allowing both control and monitoring of the corona discharge, which promotes research into the process of charging NLO polymer samples and selection of the optimal poling mode. Using the voltage-current characteristics and the second-harmonic measurements of a poled polymer we also demonstrate the influence of the setup parameters on the efficiency of poling the thin film NLO polymers. Darba ievadā īsumā aprakstīta koronas izlāde, izceļot koronas triodes theniskās metodes lietošanas priekšrocības optisko polimeru polarizēšanā ar pozitīvās koronas līdzstrāvu. Rakstā apskatīta eksperimentāla koronas polēšanas ierīce, kas sniedz iespēju polarizēt nelineāros optiskos (NLO) polimērus pie konstantas strāvas (līdz pat 1 nA) un fiksēta koronas elektroda-tīkliņa sprieguma, ļaujot veikt polēšanu paaugstinātās temperatūrās līdz 200 oC. Ierīcē paredzētas plašas koronas izlādes sprieguma izvēles robežas (3-15 kV), iespējas mainīt elektrodu savstarpējo izvietojumu un izv

  13. Water Vapour Abundance and Distribution in the Lower Venusian Atmosphere

    NASA Astrophysics Data System (ADS)

    Chamberlain, S.; Bailey, J.

    2012-04-01

    We present ground-based observations and modelling studies of water vapour abundance and distribution in the Venusian lower atmosphere through analysis of absorption band depths within the 1.18 μm window. The lower atmosphere of Venus is difficult to study by both in situ and remote instruments. This is due to the planet wide cloud cover that obscures visual wavelengths and surface pressures approaching 100 times that of the Earth. In 1984 ground based observations resulted in the discovery of atmospheric windows on the Venusian nightside (Allen and Crawford, 1984). Here, near infrared radiation originating at the surface and lower atmosphere, pass relatively unimpeded through the Venus clouds. This discovery enabled remote studies of the Venusian subcloud region. Determining the abundance and distribution of water vapour is key to understanding the development, maintenance and links between major radiative and dynamical features of the Venus atmosphere. Water vapour in the lower atmosphere plays an important role in heat transfer and is pertinent to the runaway greenhouse effect and dynamical superrotation observed on Venus. Detailed studies of water vapour abundance and distribution throughout the lower atmosphere of Venus are therefore needed in order to develop accurate chemical, radiative and dynamical models. Ground-based spatially resolved near infrared spectroscopic observations of the Venusian nightside have been obtained from Siding Spring Observatory at each inferior conjunction since 2002. Observations have been made using the IRIS2 instrument on the Anglo-Australian Telescope and CASPIR on the 2.3m ANU telescope. The model VSTAR (Bailey and Kedziora-Chudczer 2012) is used to simulate the observed Venus spectra as seen through the Earth's atmosphere and best fit water vapour abundances are found for approximately 300 locations across the Venus nightside disk. Recent improvements in ground-based near-infrared instruments allow a substantial improvement

  14. Experimental and Numerical Study of Swirling Flows and Flame Dynamics

    NASA Astrophysics Data System (ADS)

    Abricka, M.; Barmina, I.; Valdmanis, R.; Zake, M.

    2014-08-01

    veidojas pie kanāla sienām, ierosina no granulu slāņa atstarotās augšupvērstas aksiālās plūsmas veidošanos, palielinot plūsmas aksiālo ātrumu, savukārt augšupvērstā tangenciālā plūsma veido pretēji vērstu aksiālo plūsmu, veidojot recirkulācijas zonu ar izteiktu aksiālās plūsmas stagnāciju tās centrālajā daļā. Pie vienādiem primārā un sekundārā gaisa padeves nosacījumiem atšķirīga plūsmas dinamikas veidošanās ir konstatēta liesmas virpuļplūsmai, kuras veidošanos būtiski ietekmē granulētas biomasas gazifikācija ar sekojošu gaistošo savienojumu uzliesmošanu un degšanas procesa veidošanos liesmas centrālajā daļā. Reversās virpuļplūsmas veidošanās intensificē gaistošo savienojumu sajaukšanos ar gaisa virpuļplūsmu, un stabila degšanas procesa veidošanos plūsmas centrālajā daļā ar korelējošu aksiālā plūsmas ātruma palielināšanos salīdzinot ar nereaģējošo aukstā gaisa plūsmu, pie vienādiem šo plūsmu veidošanās sākuma nosacījumiem samazinot liesmas virpuļskaitli un ierobežojot recirkulācijas zonas veidošanos degšanas zonas pamatnē.

  15. Oak Ridge 25URC Tandem Accelerator 2008 SNEAP Lab Report

    SciTech Connect

    Meigs, Martha J; Juras, Raymond C

    2011-01-01

    radiological survey found no contamination outside the shielded vaults. No decontamination was required. No individual received any detectable radiological dose as a result of this event. The 25URC tandem accelerator was given permission to resume operation with stable beams in early September, but radioactive ion production is still not allowed. Subsequent analysis indicated a release that consisted entirely of noble gasses (Xe and Kr isotopes). We believe we have identified two unrelated failures, one associated with the HVAC system and the other with the roughing system exhaust which accounts for both the escape of noble gasses into the IRIS1 vault and their migration outside the vault. An investigation team report is expected by October 24. At that time, corrective actions will be determined and the path to future radioactive ion beam production will be known. The break from operations allowed a few upgrades to be implemented. The most notable was the installation and commissioning of a SNICS ion source purchased from National Electrostatics Corporation (NEC). The SNICS replaced the old Alton/Aarhus source that we have used for many years. An ANU style gas cathode holder was purchased also but has not yet been implemented. The first beams have been produced by the source and the biggest problem encountered was reducing the beam for very low current experiments. A new power supply for the injection magnet was installed during this period also. Radioactive ion beam (RIB) development at the High Power Target Laboratory (HPTL) has been delayed this year while installing the platforms, conduits and equipment for the second Injector for Radioactive Ion Species (IRIS2) which is co-located with the HPTL facility. Therefore, the majority of development activities have been performed at the two off-line ion source test facilities (ISTF1 and ISTF2) and the On-Line Test Facility (OLTF). Both test facilities have been developing systems which will eventually be used with IRIS2. Two new

  16. Oak Ridge 25URC Tandem Accelerator 2007 SNEAP Lab Report

    SciTech Connect

    Meigs, Martha J; Juras, Raymond C

    2008-01-01

    contamination outside the shielded vaults. No decontamination was required. No individual received any detectable radiological dose as a result of this event. The 25URC tandem accelerator was given permission to resume operation with stable beams in early September, but radioactive ion production is still not allowed. Subsequent analysis indicated a release that consisted entirely of noble gasses (Xe and Kr isotopes). We believe we have identified two unrelated failures, one associated with the HVAC system and the other with the roughing system exhaust which accounts for both the escape of noble gasses into the IRIS1 vault and their migration outside the vault. An investigation team report is expected by October 24. At that time, corrective actions will be determined and the path to future radioactive ion beam production will be known. The break from operations allowed a few upgrades to be implemented. The most notable was the installation and commissioning of a SNICS ion source purchased from National Electrostatics Corporation (NEC). The SNICS replaced the old Alton/Aarhus source that we have used for many years. An ANU style gas cathode holder was purchased also but has not yet been implemented. The first beams have been produced by the source and the biggest problem encountered was reducing the beam for very low current experiments. A new power supply for the injection magnet was installed during this period also. Radioactive ion beam (RIB) development at the High Power Target Laboratory (HPTL) has been delayed this year while installing the platforms, conduits and equipment for the second Injector for Radioactive Ion Species (IRIS2) which is co-located with the HPTL facility. The majority of development activities have been performed at the two off-line ion source test facilities (ISTF1 and ISTF2) and the On-Line Test Facility (OLTF). Both test facilities have been developing systems which will eventually be used with IRIS2. Two new tunable Ti:Sapphire lasers have been

  17. Digital Base Band Converter As Radar Vlbi Backend / Dbbc Kā Ciparošanas Sistēma Radara Vlbi Novērojumiem

    NASA Astrophysics Data System (ADS)

    Tuccari, G.; Bezrukovs, Vl.; Nechaeva, M.

    2012-12-01

    izmēru objektus. Debess apgabalaapstarošanai tiek izmantots jaudīgs raidītājs, un tiek analizēts atbalss signāls, kasatstarojas no zināmiem vai nezināmiem objektiem un tiek uztverts ar vienu vaivairākiem teleskopiem uz Zemes, tādējādi realizējot vienas antenas vai interferometrisku signāla detektēšanu. DBBC sistēma ar radara VLBI programmatūruspēj realizēt augstas izšķirtspējas spektra analīzi, saglabājot atbalss signālu arsagaidāmo frekvenci centrālajā zonā un ieskaitot nepieciešamās Doplera frekvencesnobīdes korekcijas. Tālāk, izmantojot dažādus ievadparametrus, iespējamspielietot ļoti ilgu integrācijas laiku ārkārtīgi vāju signālu detektēšanai. Izmantojotreālā laika informāciju, turpmāk ir iespējams viegli analizēt nepieciešamo apgabaluun detektēt nezināmus objektus vai objektus ar neprecīzi zināmiem orbītu parametriem.Rakstā izklāstītas paredzamās minētās programmatūras funkcijas un tāsizmantošanas plāni pirmajos novērojumos.

  18. New Galactic Planetary Nebulae and the role of Central Star Binarity

    NASA Astrophysics Data System (ADS)

    Miszalski, B.

    2009-09-01

    : (i) The kinematics of the bulge, and (ii) The role of binary central stars of PNe. Radial velocities of hundreds of PNe towards the bulge were measured from ANU 2.3-m longslit spectroscopy and from deep spectroscopy conducted with the AAT 2dF AAOmega and VLT FLAMES multi-object spectroscopy facilities. Multiple measurements were recorded for many PNe resulting in a more accurate catalogue of "1200 PNe within the |l| <= 30 degree region reaching a very high completeness of 95%. The kinematic study enabled a slope of 104 km/s/kpc to be measured for the rotation curve of the bulge that is in excellent agreement with 100 km/s/kpc determined from M-giants. General kinematic profiles were calculated and compared well with other tracer populations to bring new constraints on an existing dynamical model of the bulge. A completely new and powerful approach is conceived to discover large numbers of binary CSPN. The concept was employed to analyse the time-series photometry of nearly 300 Galactic bulge PNe from the OGLE-III microlensing survey. A total of 21 periodic binary CSPN candidates were found after careful elimination of 27 PN mimics identified using deep spectroscopy. The orbital period distribution is dominated by periods less than one day which indicates these binaries must have been produced via the commonenvelope (CE) phase of binary stellar evolution. These discoveries have effectively doubled the population of close binary CSPN whose potential in advancing our knowledge of CE evolution has yet to be realised. Gemini GMOS spectroscopy of 14 members of the OGLE sample produces 10 bona fide binary CSPN, 2 likely binary CSPN and 2 unlikely associations. There remains three candidates in the centre of small nebulae which leave little doubt of their bona fide status pending future spectroscopy, while four other candidates lie in larger nebulae awaiting confirmation. Cool giant companions are revealed in at least two binary CSPN and in one instance UV photometry proves

  19. PREFACE: Rutherford Centennial Conference on Nuclear Physics

    NASA Astrophysics Data System (ADS)

    Freeman, Sean

    2012-09-01

    Dobacewski (Warsaw, Poland) G Dracoulis (ANU, Australia) S J Freedman (LBL, USA) M Hass (Weizmann Institute, Israel) M Huyse (Leuven, Belgium) P Jones (Birmingham, UK) D Khao (Hanoi, Vietnam) R Krücken (Munich, Germany) K Langanke (Darmstadt, Germany) C Lister (Argonne, USA) G A Miller (University of Washington, USA) D Morrissey (MSU, USA) T Motobayashi (RIKEN, Japan) S Nagamiya (J-PARC, Japan) W Nazarewicz (ORNL, USA) S Mullins (iThemba, South Africa) T Nakamura (Tokyo, Japan) P Roussel Chomaz (GANIL, France) R Ribas (Sao Paolo, Brazil) M Vanderhaeghen (Mainz, Germany) U Wiedner (Uppsala, Sweden) F Xu (Peking University, China) Q Zhao (IHEP, Bejing) W Zajc (Columbia, USA)