WorldWideScience

Sample records for boring

  1. Mind where you bore!

    CERN Multimedia

    Anaïs Schaeffer

    2012-01-01

    With renewable energies on the up and up, geothermal heating is becoming increasingly popular. An ardent supporter of sustainable development, CERN welcomes this trend, even though it has certain risks for the Laboratory.   More and more people in Switzerland and France are switching to geothermal heating, with the result that more and more bore holes are being sunk for geothermal probes. Since, on average, such bore holes go down to depths of 100 m they can have an impact on CERN’s underground facilities, which are also located at approximately that depth. In the Canton of Geneva, all bore holes, whatever their depth, are subject to planning permission. Applications for planning permission are granted – or refused – only after consultation with the Ground survey department (GESDEC). In France, only bore holes below a depth of 100 m require planning permission. In theory, bore holes to lesser depths simply need to be declared to the DREAL (Dire...

  2. Tunnel boring machine applications

    International Nuclear Information System (INIS)

    This paper reports that characterization of Yucca Mountain for a potential repository requires construction of an underground Exploratory Studies Facility (ESF). Mechanical excavating methods have been proposed for construction of the ESF as they offer a number of advantages over drilling and blasting at the Yucca Mountain site, including; less ground disturbance and therefore a potential for less adverse effects on the integrity of the site, creation of a more stable excavation cross section requiring less ground support, and an inherently safer and cleaner working environment. The tunnel boring machine (TBM) provides a proven technology for excavating the welded and unwelded Yucca Mountain tuffs. The access ramps and main underground tunnels form the largest part of the ESF underground construction work, and have been designed for excavation by TBM

  3. Boring and lining horizontal emplacement holes

    International Nuclear Information System (INIS)

    Systems for and techniques for constructing suitable emplacement holes are being considered for an underground nuclear waste repository. This study is an investigation of methods to bore and line horizontal boreholes of varying lengths. The development prototype boring machine already designed has been selected to bore the long holes (350 ft.), while the method selected to bore short holes, 42, 58, and 75 ft. involves two separate systems: one to bore the hole, the other to line the hole. The systems described in this report are not off-the-shelf, but represent a reasonable extension of current technology. 2 refs., 6 figs., 12 tabs

  4. Plasma armatures in large bore launchers

    International Nuclear Information System (INIS)

    Almost all experimental observations of plasma armatures in railguns have been madein bores less than 20 mm in diameter. A serious velocity limiting interaction with the bore walls has been identified. The plasma radiates to the bore walls at power levels of several GW/m2. The bore walls ablate and the ablated material enters the armature resulting in an apparent drag. In this paper, the authors examine the ablation induced drag as bore size is increased. Using a 3-D computational model they determine plasma temperature and pressure distributions. Bore wall ablation and drag are then computed. They find that plasma armature length and resistance increase only slowly with bore size. Radiant power densities do not change significantly and the deleterious affects of ablation induced drag decrease

  5. Large-bore pipe decontamination

    International Nuclear Information System (INIS)

    The decontamination and decommissioning (D and D) of 1200 buildings within the US Department of Energy-Office of Environmental Management (DOE-EM) Complex will require the disposition of miles of pipe. The disposition of large-bore pipe, in particular, presents difficulties in the area of decontamination and characterization. The pipe is potentially contaminated internally as well as externally. This situation requires a system capable of decontaminating and characterizing both the inside and outside of the pipe. Current decontamination and characterization systems are not designed for application to this geometry, making the direct disposal of piping systems necessary in many cases. The pipe often creates voids in the disposal cell, which requires the pipe to be cut in half or filled with a grout material. These methods are labor intensive and costly to perform on large volumes of pipe. Direct disposal does not take advantage of recycling, which could provide monetary dividends. To facilitate the decontamination and characterization of large-bore piping and thereby reduce the volume of piping required for disposal, a detailed analysis will be conducted to document the pipe remediation problem set; determine potential technologies to solve this remediation problem set; design and laboratory test potential decontamination and characterization technologies; fabricate a prototype system; provide a cost-benefit analysis of the proposed system; and transfer the technology to industry. This report summarizes the activities performed during fiscal year 1997 and describes the planned activities for fiscal year 1998. Accomplishments for FY97 include the development of the applicable and relevant and appropriate regulations, the screening of decontamination and characterization technologies, and the selection and initial design of the decontamination system

  6. Large-bore pipe decontamination

    Energy Technology Data Exchange (ETDEWEB)

    Ebadian, M.A.

    1998-01-01

    The decontamination and decommissioning (D and D) of 1200 buildings within the US Department of Energy-Office of Environmental Management (DOE-EM) Complex will require the disposition of miles of pipe. The disposition of large-bore pipe, in particular, presents difficulties in the area of decontamination and characterization. The pipe is potentially contaminated internally as well as externally. This situation requires a system capable of decontaminating and characterizing both the inside and outside of the pipe. Current decontamination and characterization systems are not designed for application to this geometry, making the direct disposal of piping systems necessary in many cases. The pipe often creates voids in the disposal cell, which requires the pipe to be cut in half or filled with a grout material. These methods are labor intensive and costly to perform on large volumes of pipe. Direct disposal does not take advantage of recycling, which could provide monetary dividends. To facilitate the decontamination and characterization of large-bore piping and thereby reduce the volume of piping required for disposal, a detailed analysis will be conducted to document the pipe remediation problem set; determine potential technologies to solve this remediation problem set; design and laboratory test potential decontamination and characterization technologies; fabricate a prototype system; provide a cost-benefit analysis of the proposed system; and transfer the technology to industry. This report summarizes the activities performed during fiscal year 1997 and describes the planned activities for fiscal year 1998. Accomplishments for FY97 include the development of the applicable and relevant and appropriate regulations, the screening of decontamination and characterization technologies, and the selection and initial design of the decontamination system.

  7. Number of Producible and Service Well Bores on Federal Lands

    Data.gov (United States)

    Bureau of Land Management, Department of the Interior — This table contains the total number of producible well bores by state as of the end of each fiscal year. A well bore is considered producible if the well bore is...

  8. TMI-2 core boring machine

    International Nuclear Information System (INIS)

    An important and essential aspect of the TMI-2 defueling effort is to determine what occurred in the core region during the accident. Remote cameras and probes only portray a portion of the overall picture. What lies beneath the rubble bed and solidified sublayer is, as yet, unknown. This paper discusses the TMI-2 Core Boring Machine, which has been developed to drill into the damaged core of the TMI-2 reactor and extract stratified samples of the core. This machine, its unique support structure, positioning and leveling systems, and specially designed drill bits, combine to provide a unique mechanical system. In addition, the machine is controlled by a microprocessor; which actually controls the drilling operation, allowing relatively inexperienced operators to drill the core samples. A data acquisition system is data integral with the controlling system and collects data relative to system conditions and monitored parameters during drilling. Data obtained during the actual drilling operations are collected in a data base which will be used for actual mapping of the core region, identifying materials and stratification levels that are present

  9. Tribocorrosion challenges in tunnel boring machinery (TBM)

    OpenAIRE

    Espallargas Alvarez, Nuria

    2015-01-01

    Tunnel Boring Machines (TBM) are used to bore tunnels, a specific area of interest for TBMs is their cutter heads, which is a massive steel structure with hardened steel disc cutters attached. The disc cutters can encounter all types of geology (i.e. from soft clays, slits, sands etc., to soft rock and extremely hard rock) and environments (i.e. dry, wet, seawater or chemical additives). These geologies and environments cause the disc cutters to be continuously exposed to degra...

  10. Boring of full scale deposition holes using a novel dry blind boring method

    International Nuclear Information System (INIS)

    As a part of the Finnish radioactive waste disposal research three holes (the size of deposition holes) were bored in the research tunnel at Olkiluoto in Finland. A novel full-face boring technique was used based on rotary crushing of rock and removal of crushed rock by vacuum flushing through the drill string an the purpose of the work was to demonstrate the feasibility of the technique. During the boring test procedures were carried out in order to determine the effect of charges in operating parameters on the performance of the boring machine and the quality of the hole. (refs.)

  11. Bore-auger servo-mechanism

    Energy Technology Data Exchange (ETDEWEB)

    Levkovich, P.Ye.; Bolotov, N.L.; Kiselev, Ye.I.; Opal' ko, L.L.; Podubniy, V.I.; Savich, N.S.; Tverezyy, Yu.F.

    1980-06-06

    A bore-auger servo-mechanism is proposed for a drilling machine. This unit consists of a drilling bit, an auger boring section with a screw-type surface, upper and lower cutting disks, mounted onto the supports between the main auger sections, and a linear auger section with lateral ties. In order to simplify construction, the upper cutting disk is equipped with its own auger bits, both below and above the disks, thus facilitating interaction with the screw-type surface of the auger sections.

  12. Superconducting Super Collider Laboratory : tunnel boring

    CERN Multimedia

    SSC Media Production

    1999-01-01

    This film will take you down into the tunnel, show you the technology involved in boring the tunnel, and show what the SSC fmeans to the U.S. in terms of scientific discovery, innovative collaborations with industry and stimulating the job base nation-wide.

  13. Tomographic Measurement Of Laser-Bored Holes

    Science.gov (United States)

    Willenberg, James D.; Roy, Jack; Spiegel, Lyle B.

    1992-01-01

    Nondestructive technique detects internal variations in arrays of small holes. Inspection method checks laser-bored holes for accuracy. Combines computed tomography and digital laminography. Both types of views made at many parallel planes within plate. System prints out tables of measured and standard deviation of diameter at all planes for each hole.

  14. Tension Tests On Bored Piles In Sand

    DEFF Research Database (Denmark)

    Krabbenhøft, Sven; Clausen, Johan; Damkilde, Lars

    2006-01-01

    The lengths of the bored piles varied from 2 m to 6 m and all were of a diameter of 140 mm. The piles were tested to failure in tension and the load-displacement relations were recorded. The investigation has shown pronounced differences between the load bearing capacities obtained by different d...

  15. The possible forms of bore resistance

    Directory of Open Access Journals (Sweden)

    N. Balasubramanian

    1957-04-01

    Full Text Available A method is proposed for calculating the bore resistance of projectile by assuming as given the pressure-space curve. Applying this method to the Le Due and the isothermal systems of internal ballistics, it is shown that these systems imply certain physically in admissible features at the beginning of the motion.

  16. Worcester's Blog – boring election: a myth?

    OpenAIRE

    Worcester, Robert

    2011-01-01

    The blogs are at it today, along with comment in some newspapers and on radio and TV, that – shock horror – only 51 per cent of the electorate say they find the election interesting, according to the findings of YouGov’s poll today. Another 43 per cent said they found it boring.

  17. The morphological diversity of Osedax worm borings (Annelidia: Siboglinidae)

    OpenAIRE

    Higgs, ND; Glover, AG; Dahlgren, TG; Smith, CR; Fujiwara, Y.; Pradillion, F; Johnson, SB; Vrijenhoek, RC; Little, CTS

    2014-01-01

    Marine worms in the genus Osedax, have specialized ‘root’ tissues used to bore into the bones of decomposing vertebrate skeletons and obtain nutrition. We investigated the borings of nine Osedax species, using micro computed tomography to quantitatively describe the morphology of the borings and provide three-dimensional reconstructions of the space occupied by Osedax root tissues inside the bone. Each Osedax species displayed a consistent boring morphology in any given bone, but these differ...

  18. The biomechanics of burrowing and boring.

    Science.gov (United States)

    Dorgan, Kelly M

    2015-01-15

    Burrowers and borers are ecosystem engineers that alter their physical environments through bioturbation, bioirrigation and bioerosion. The mechanisms of moving through solid substrata by burrowing or boring depend on the mechanical properties of the medium and the size and morphology of the organism. For burrowing animals, mud differs mechanically from sand; in mud, sediment grains are suspended in an organic matrix that fails by fracture. Macrofauna extend burrows through this elastic mud by fracture. Sand is granular and non-cohesive, enabling grains to more easily move relative to each other, and macrofaunal burrowers use fluidization or plastic rearrangement of grains. In both sand and mud, peristaltic movements apply normal forces and reduce shear. Excavation and localized grain compaction are mechanisms that plastically deform sediments and are effective in both mud and sand, with bulk excavation being used by larger organisms and localized compaction by smaller organisms. Mechanical boring of hard substrata is an extreme form of excavation in which no compaction of burrow walls occurs and grains are abraded with rigid, hard structures. Chemical boring involves secretion to dissolve or soften generally carbonate substrata. Despite substantial differences in the mechanics of the media, similar burrowing behaviors are effective in mud and sand. PMID:25609781

  19. Integrated test plan for directional boring

    International Nuclear Information System (INIS)

    This integrated test plan describes the field testing of the DITCH WITCH Directional Boring System. DITCH WITCH is a registered trademark of The Charles Machine Works, Inc., Perry, Oklahoma. The test is being conducted as a coordinated effort between Charles Machine Works (CMW), Sandia National Laboratories (SNL), and the Westinghouse Hanford Company (WHC). Funding for the WHC portion of the project is through the Volatile Organic Compound-Arid Integrated Demonstration (VOC-Arid ID). The purpose of the test is to evaluate the performance of the directional boring system for possible future use on environmental restoration projects at Hanford and other Department of Energy (DOE) sites. The test will be conducted near the 200 Areas Fire Station located between the 200 East and 200 West Area of the Hanford Site. The directional boring system will be used to drill and complete (with fiberglass casing) two horizontal boreholes. A third borehole will be drilled to test sampling equipment but will not be completed with casing

  20. Fill tube bore inspection with machine vision

    Energy Technology Data Exchange (ETDEWEB)

    Pechersky, M.J.; Mosley, W.C.; Dickerson, R.K.

    1992-01-01

    A semi-automated technique for bore inspection of small diameter tubes is presented. The inspections are performed to insure that the bore surfaces are free of contaminants or defects. The image collectionscheme uses a borescope which is stepped along the length of the tube. An image is acquired at each step and portions from each image are combined to yield a planar image. Color analysis classifies the oxidation levels in the bore of the fill tubes. The analysis is performed by taking the image's mean values of the red, green, and blue intensities and computing a figure of merit which is then used to estimate the relative amount of oxidation. This estimation scheme was shown to have a high level of correlation with the tube oxidation levels and the quality of the subsequent welds as determined by metallographic evaluation.Surface imperfections are detected by a series of digital filtering steps followed by a statistical analysis of the resulting binary image. The frequency parameter of the Poisson distribution for the total image and image segments are computed. A statistical significance test is performed by comparing the frequency parameter of each segment to the global statistics of the image. Fine longitudinal scratches were detected with this method.

  1. Fill tube bore inspection with machine vision

    Energy Technology Data Exchange (ETDEWEB)

    Pechersky, M.J.; Mosley, W.C.; Dickerson, R.K.

    1992-12-31

    A semi-automated technique for bore inspection of small diameter tubes is presented. The inspections are performed to insure that the bore surfaces are free of contaminants or defects. The image collectionscheme uses a borescope which is stepped along the length of the tube. An image is acquired at each step and portions from each image are combined to yield a planar image. Color analysis classifies the oxidation levels in the bore of the fill tubes. The analysis is performed by taking the image`s mean values of the red, green, and blue intensities and computing a figure of merit which is then used to estimate the relative amount of oxidation. This estimation scheme was shown to have a high level of correlation with the tube oxidation levels and the quality of the subsequent welds as determined by metallographic evaluation.Surface imperfections are detected by a series of digital filtering steps followed by a statistical analysis of the resulting binary image. The frequency parameter of the Poisson distribution for the total image and image segments are computed. A statistical significance test is performed by comparing the frequency parameter of each segment to the global statistics of the image. Fine longitudinal scratches were detected with this method.

  2. Boring of full scale deposition holes using a novel dry blind boring method

    International Nuclear Information System (INIS)

    Three holes the size of deposition holes (depth 7.5 m and diameter 1.5 m) were bored in the Research Tunnel at Olkiluoto, Finland. A novel full-face boring technique was used based on rotary crushing of rock and removal of crushed rock by vacuum flushing through the drill string. The purpose of the work was to demonstrate the feasibility of the technique. During the boring test procedures were carried out in order to determine the effect of changes in operating parameters on the performance of the boring machine and the quality of the hole. The boring method was found to be technically feasible and efficient. Evaluation of the quality of the hole included studies of the geometry of the hole, measurements of the surface roughness using a laser profilometer and study of excavation disturbances in the zone adjacent to the surface of the holes using two novel methods, He-gas diffusion and the 14C-polymethylmethacrylate methods. 43 refs

  3. Large Bore Powder Gun Qualification (U)

    Energy Technology Data Exchange (ETDEWEB)

    Rabern, Donald A. [Los Alamos National Laboratory; Valdiviez, Robert [Los Alamos National Laboratory

    2012-04-02

    A Large Bore Powder Gun (LBPG) is being designed to enable experimentalists to characterize material behavior outside the capabilities of the NNSS JASPER and LANL TA-55 PF-4 guns. The combination of these three guns will create a capability to conduct impact experiments over a wide range of pressures and shock profiles. The Large Bore Powder Gun will be fielded at the Nevada National Security Site (NNSS) U1a Complex. The Complex is nearly 1000 ft below ground with dedicated drifts for testing, instrumentation, and post-shot entombment. To ensure the reliability, safety, and performance of the LBPG, a qualification plan has been established and documented here. Requirements for the LBPG have been established and documented in WE-14-TR-0065 U A, Large Bore Powder Gun Customer Requirements. The document includes the requirements for the physics experiments, the gun and confinement systems, and operations at NNSS. A detailed description of the requirements is established in that document and is referred to and quoted throughout this document. Two Gun and Confinement Systems will be fielded. The Prototype Gun will be used primarily to characterize the gun and confinement performance and be the primary platform for qualification actions. This gun will also be used to investigate and qualify target and diagnostic modifications through the life of the program (U1a.104 Drift). An identical gun, the Physics Gun, will be fielded for confirmatory and Pu experiments (U1a.102D Drift). Both guns will be qualified for operation. The Gun and Confinement System design will be qualified through analysis, inspection, and testing using the Prototype Gun for the majority of process. The Physics Gun will be qualified through inspection and a limited number of qualification tests to ensure performance and behavior equivalent to the Prototype gun. Figure 1.1 shows the partial configuration of U1a and the locations of the Prototype and Physics Gun/Confinement Systems.

  4. Measurement of Antenna Bore-Sight Gain

    Science.gov (United States)

    Fortinberry, Jarrod; Shumpert, Thomas H.

    2016-01-01

    The absolute or free-field gain of a simple antenna can be approximated using standard antenna theory formulae or for a more accurate prediction, numerical methods may be employed to solve for antenna parameters including gain. Both of these methods will result in relatively reasonable estimates but in practice antenna gain is usually verified and documented via measurements and calibration. In this paper, a relatively simple and low-cost, yet effective means of determining the bore-sight free-field gain of a VHF/UHF antenna is proposed by using the Brewster angle relationship.

  5. Bored tunnel storage of nuclear waste

    International Nuclear Information System (INIS)

    Contrary to the current emphasis on deep geologic disposal of high-level nuclear waste, simple bored tunnels offer many advantages. Much lower cost is important in this period of severe budget crisis. Recoverability is feasible from a tunnel in a mountain, but dubious from a flooded mine 3000-ft (914.4-m) deep. It is quite possible that the world will need the breeder energy cycle urgently 200 years from now. In the writer's opinion, it would be a profound mistake for our generation to make so much fertile and fissile uranium fuel unavailable for future generations. Storage conditions in a near-surface repository are much better than in a deep repository, because the temperature can be kept down, pressure will be atmospheric instead of potentially 1200 psi (8.2738 MPa), and flooding will not occur. The ''hydrothermal'' conditions are thus completely avoided. Accordingly, endless studies of hydrogeology, water pathway times, waste-host rock interactions, and the like are unnecessary, and the time for action is much shorter. In addition, spent (partly used) fuel also contains palladium and rhodium in quantities that may be important in the future. ''Spent'' fuel is renamed ''reusable uranium fuel'' (RUF). Use of this simple bored tunnel storage system should be demonstrated as soon as possible to persuade Congress to change direction on nuclear waste disposal away from deep-mined repositories

  6. Investigation of a mesospheric bore event over northern China

    Directory of Open Access Journals (Sweden)

    Q. Li

    2013-03-01

    Full Text Available A mesospheric bore event was observed using an OH all-sky airglow imager (ASAI at Xinglong (40.2° N, 117.4° E, in northern China, on the night of 8–9 January 2011. Simultaneous observations by a Doppler meteor radar, a broadband sodium lidar, and TIMED/SABER OH intensity and temperature measurements are used to investigate the characteristics and environment of the bore propagation and the possible relations with the Na density perturbations. The bore propagated from northeast to southwest and divided the sky into bright and dark halves. The calculations show that the bore has an average phase velocity of 68 m s−1. The crests following the bore have a horizontal wavelength of ~ 22 km. These parameters are consistent with the hydraulic jump theory proposed by Dewan and Picard, as well as the previous bore reports. Simultaneous wind measurements from the Doppler meteor radar at Shisanling (40.3° N, 116.2° E and temperature data from SABER on board the TIMED satellite are used to characterize the propagating environment of the bore. The result shows that a thermal-Doppler duct exists near the OH layer that supports the horizontal propagation of the bore. Simultaneous Na lidar observations at Yanqing (40.4° N, 116.0° E suggest that there is a downward displacement of Na density during the passage of the mesospheric bore event.

  7. Conditions for tidal bore formation in convergent alluvial estuaries

    Science.gov (United States)

    Bonneton, Philippe; Filippini, Andrea Gilberto; Arpaia, Luca; Bonneton, Natalie; Ricchiuto, Mario

    2016-04-01

    Over the last decade there has been an increasing interest in tidal bore dynamics. However most studies have been focused on small-scale bore processes. The present paper describes the first quantitative study, at the estuary scale, of the conditions for tidal bore formation in convergent alluvial estuaries. When freshwater discharge and large-scale spatial variations of the estuary water depth can be neglected, tide propagation in such estuaries is controlled by three main dimensionless parameters: the nonlinearity parameter ε0 , the convergence ratio δ0 and the friction parameter ϕ0. In this paper we explore this dimensionless parameter space, in terms of tidal bore occurrence, from a database of 21 estuaries (8 tidal-bore estuaries and 13 non tidal-bore estuaries). The field data point out that tidal bores occur for convergence ratios close to the critical convergence δc. A new proposed definition of the friction parameter highlights a clear separation on the parameter plane (ϕ0,ε0) between tidal-bore estuaries and non tidal-bore estuaries. More specifically, we have established that tidal bores occur in convergent estuaries when the nonlinearity parameter is greater than a critical value, εc , which is an increasing function of the friction parameter ϕ0. This result has been confirmed by numerical simulations of the two-dimensional Saint Venant equations. The real-estuary observations and the numerical simulations also show that, contrary to what is generally assumed, tide amplification is not a necessary condition for tidal bore formation. The effect of freshwater discharge on tidal bore occurrence has been analyzed from the database acquired during three long-term campaigns carried out on the Gironde/Garonne estuary. We have shown that in the upper estuary the tidal bore intensity is mainly governed by the local dimensionless tide amplitude ε. The bore intensity is an increasing function of ε and this relationship does not depend on freshwater

  8. Key technologies of drilling process with raise boring method

    Directory of Open Access Journals (Sweden)

    Zhiqiang Liu

    2015-08-01

    Full Text Available This study presents the concept of shaft constructed by raise boring in underground mines, and the idea of inverse construction can be extended to other fields of underground engineering. The conventional raise boring methods, such as the wood support method, the hanging cage method, the creeping cage method, and the deep-hole blasting method, are analyzed and compared. In addition, the raise boring machines are classified into different types and the characteristics of each type are described. The components of a raise boring machine including the drill rig, the drill string and the auxiliary system are also presented. Based on the analysis of the raise boring method, the rock mechanics problems during the raise boring process are put forward, including rock fragmentation, removal of cuttings, shaft wall stability, and borehole deviation control. Finally, the development trends of raise boring technology are described as follows: (i improvement of rock-breaking modes to raise drilling efficiency, (ii development of an intelligent control technique, and (iii development of technology and equipment for nonlinear raise boring.

  9. Formulating entompathogens for control of boring beetles in avocado orchards

    Science.gov (United States)

    A foam formulation of Beauveria bassiana was adapted to control boring beetles in avocado orchards. The two geographically independent avocado growing areas in the United States are threatened by emerging diseases vectored by boring beetles. In the California growing region, Fusarium dieback is vect...

  10. Tool support of boring circular grooves in the locking machine device

    OpenAIRE

    Хітров, Ігор Олександрович; Гевко, Ігор Богданович; Кучвара, Іван Миколайович; Фльонц, Ігор Володимирович

    2014-01-01

    Design and method of calculating boring head for boring circular grooves nodes axial locking are present. Technological scheme and cutting conditions of boring heads work in the inner holes of body details, which provides increasing of operational reliability, were proposed

  11. Osedax borings in fossil marine bird bones

    Science.gov (United States)

    Kiel, Steffen; Kahl, Wolf-Achim; Goedert, James L.

    2011-01-01

    The bone-eating marine annelid Osedax consumes mainly whale bones on the deep-sea floor, but recent colonization experiments with cow bones and molecular age estimates suggesting a possible Cretaceous origin of Osedax indicate that this worm might be able grow on a wider range of substrates. The suggested Cretaceous origin was thought to imply that Osedax could colonize marine reptile or fish bones, but there is currently no evidence that Osedax consumes bones other than those of mammals. We provide the first evidence that Osedax was, and most likely still is, able to consume non-mammalian bones, namely bird bones. Borings resembling those produced by living Osedax were found in bones of early Oligocene marine flightless diving birds (family Plotopteridae). The species that produced these boreholes had a branching filiform root that grew to a length of at least 3 mm, and lived in densities of up to 40 individuals per square centimeter. The inclusion of bird bones into the diet of Osedax has interesting implications for the recent suggestion of a Cretaceous origin of this worm because marine birds have existed continuously since the Cretaceous. Bird bones could have enabled this worm to survive times in the Earth's history when large marine vertebrates other than fish were rare, specifically after the disappearance of large marine reptiles at the end-Cretaceous mass extinction event and before the rise of whales in the Eocene.

  12. Investigation on vibrational evaluation criteria for small-bore pipe

    International Nuclear Information System (INIS)

    The well-known organization such as API and SwRI in USA developed criteria for piping vibrational evaluation. These criteria are targeted for main pipes, but not branch pipes with small bore. In this study, applicability of criteria of API and SwRI to branch pipes was investigated. Vibration test using piping system with small bore branch pipe was conducted and amplitudes of vibrational stress and displacement were measured for various exciting force. In comparison of the measurements with the two criteria, though the criteria of API and SwRI were applicable to small bore branch pipe, they made too conservative evaluation. (author)

  13. Tunnel Boring Machine for nuclear waste repository research project

    International Nuclear Information System (INIS)

    A description is presented of a Tunnel Boring Machine and its intended use on a research project underway in Sweden for demonstrating and testing methods for rock investigation at a suitable depth for a deep repository for nuclear waste

  14. The evolution of a breaking mesospheric bore wave packet

    Science.gov (United States)

    Stockwell, R. G.; Taylor, M. J.; Nielsen, K.; Jarvis, M. J.

    2011-10-01

    All-sky CCD observations of mesospheric gravity waves have been made from Halley Station Antarctica (75.5°S, 26.7°W) as part of a collaborative research program between British Antarctic Survey, U.K. and Utah State University, USA. A mesospheric bore event was observed in the nightglow emissions over a period of several hours on the 27th of May, 2001. Two dimensional S-Transform (ST) analysis is applied to the airglow images of this bore event. This local spectral technique allows one to calculate the wave parameters as a function of time and space. It is observed that the horizontal phase speed and wavelength decrease over time as the amplitude attenuates. Simultaneously with this wave event the background wind experiences a large acceleration in the direction of the wave propagation. Mesospheric bore theory calculations are used to estimate the bore duct depth and it is shown that as the wave packet evolves, the bore duct collapses (decreasing in its vertical extent). As the bore duct shrinks, the wave's group velocity decelerates, the amplitude attenuates, and the wave dissipates.

  15. High resolution chemostratigraphy for delineating well-bore pathways in the Eagle Ford Formation; Chemostratigraphy well-bore

    Energy Technology Data Exchange (ETDEWEB)

    Ratcliffe, K.T.; Hildred, G.V.; Schmidt, K.; Wright, A.M.

    2011-07-01

    Shale gas is undoubtedly the game changer and is here to stay. However, despite the flurry of activity in the North American shale resource plays, effectively exploiting the plays remains challenging. One of the key challenges is to accurately and repeatedly place a well-bore in a multi-lateral development programs relative to the 'sweet spor'. High resolution chemo stratigraphy provides one means to meet this well-bore placement challenge. (Author)

  16. Removing well bore liquid blockage by gas injection

    International Nuclear Information System (INIS)

    Gas condensate reservoirs have long presented production problems when the pressure around the well bore drops below the dew point pressure. The formation of the condensate around the well bore can be thought of as an additional 'skin' that causes a reduction in the gas flow rates. Many processes have been used successfully to prevent or reduce the formation of liquids within the entire reservoir, such as pressure maintenance schemes and gas cycling processes. The pressure maintenance scheme is designed to keep the reservoir pressure at or above the dew point pressure while the gas cycling process is intended to reduce the liquid dropout by vaporization.Often times the pressure in the near-well bore region of the reservoir falls below the dew point pressure, while the pressure in the reservoir remains higher than the dew point pressure. As the near-well bore pressure drops below the dew point pressure, retrograde condensation occurs leading to the formation and then the mobilization of the condensate phase towards the producing wells. The liquid phase accumulates in the near Well bore region, forming a ring, which progressively reduces the gas deliverability. This study is designed to provide an insight into the mechanism of gas injection process in reducing gas-well productivity losses due to condensate blocking in the near well bore region. The study also evaluates the effectiveness of lean gas, N2, and CO2 Huff 'n' Puff injection technique in removing the liquid dropout accumulation in and around the well bore. Results of the study show the importance of selecting the optimum injection volume and pressure. (author)

  17. Twin mesospheric bores observed over Brazilian equatorial region

    Science.gov (United States)

    Medeiros, A. F.; Paulino, I.; Taylor, M. J.; Fechine, J.; Takahashi, H.; Buriti, R. A.; Lima, L. M.; Wrasse, C. M.

    2016-01-01

    Two consecutive mesospheric bores were observed simultaneously by two all-sky cameras on 19 December 2006. The observations were carried out in the northeast of Brazil at two different stations: São João do Cariri (36.5° W, 7.4° S) and Monteiro (37.1° W, 7.9° S), which are by about 85 km apart. The mesospheric bores were observed within an interval of ˜ 3 h in the NIR OH and OI557.7 nm airglow emissions. Both bores propagated to the east and showed similar characteristics. However, the first one exhibited a dark leading front with several trailing waves behind and progressed into a brighter airglow region, while the second bore, observed in the OH layer, was comprised of several bright waves propagating into a darker airglow region. This is the first paper to report events like these, called twin mesospheric bores. The background of the atmosphere during the occurrence of these events was studied by considering the temperature profiles from the TIMED/SABER satellite and wind from a meteor radar.

  18. Exploratory boring in Japan. ; Its history and recent topics. Chishitsu chosa boring. ; Sono rekishi to saikin no gijutsu no doko

    Energy Technology Data Exchange (ETDEWEB)

    Koike, Y. (Oyo Corp., Tokyo (Japan)); Hosaka, M.

    1993-09-01

    This paper introduces latest trends in exploratory boring technologies. The freeze sampling method freezes ground beds consisting of sand, gravels, and Shirasu in the locations where they are, and samples good-quality samples without disturbances. The air bubble boring method injects a surfactant into compressed air, and utilizes foamed surfactant as a drilling fluid, the method being capable of sampling good-quality cores even from gravel and soft rock beds. The rotary sounding method estimates ground bed strength from drilling resistance generated at a tip bit during boring. The method provides high correlation of drilling velocity, rotation speed, and thrust with uniaxial compression strength. A spar-buoy boring scaffold has been developed for scaffolding in off-shore boring. This scaffold keeps its upright position by drawing a buoyant body into water to have the buoyancy work as vertically upward tension. The scaffold makes safe works possible even under a condition of water depth greater than 15 m and tidal current of 2 knots or faster. 15 refs., 8 figs.

  19. The evolution of a breaking mesospheric bore wave packet

    OpenAIRE

    Stockwell, R G.; Taylor, M. J.; Nielsen, K.; Jarvis, M J

    2011-01-01

    All-sky CCD observations of mesospheric gravity waves have been made from Halley Station Antarctica (75.5°S, 26.7°W) as part of a collaborative research program between British Antarctic Survey, U.K. and Utah State University, USA. A mesospheric bore event was observed in the nightglow emissions over a period of several hours on the 27th of May, 2001. Two dimensional S-Transform (ST) analysis is applied to the airglow images of this bore event. This local spectral technique allows one to calc...

  20. Boring of full scale deposition holes at the Aespoe Hard Rock Laboratory. Operational experiences including boring performance and a work time analysis

    International Nuclear Information System (INIS)

    Thirteen experimental deposition holes similar to those in the present KBS-3 design have been bored at the Aespoe Hard Rock Laboratory, Oskarshamn, Sweden. The objective with the boring program was to test and demonstrate the current technique for boring of large vertical holes in granitic rock. Conclusions and results from this project is used in the planning process for the deposition holes that will be bored in the real repository for spent nuclear fuel. The boreholes are also important for three major projects. The Prototype Repository, the Canister Retrieval Test and the Demonstration project will all need full-scale deposition holes for their commissioning. The holes are bored in full scale and have a radius of 1.75 m and a depth of 8.5 m. To bore the holes an existing TBM design was modified to produce a novel type Shaft Boring Machine (SBM) suitable for boring 1.75 m diameter holes from a relatively small tunnel. The cutter head was equipped with two types of roller cutters: two row carbide button cutters and disc cutters. Removal of the cuttings was made with a vacuum suction system. The boring was monitored and boring parameters recorded by a computerised system for the evaluation of the boring performance. During boring of four of the holes temperature, stress and strain measurements were performed. Acoustic emission measurements were also performed during boring of these four holes. The results of these activities will not be discussed in this report since they are reported separately. Criteria regarding nominal borehole diameter, deviation of start and end centre point, surface roughness and performance of the machine were set up according to the KBS-3 design and were fulfilled with a fair margin. The average total time for boring one deposition hole during this project was 105 hours

  1. CNLC Provides Well-Bore Technical Services Worldwide

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    @@ BRIEF INTRODUCTION of CNLC China National Logging Corporation (CNLC), a subsidiary of CNPC Services & Engineering Ltd.,which provides well bore technical services at international market solely on behalf of CNPC, is a specialized service company mainly engaged in: 1. Wire-line logging, mud logging, well testing,well completion, perforating and other relevant engineering services.

  2. Use of the interface survey in irregular bore holes

    International Nuclear Information System (INIS)

    Among the most frequently used techniques for surveying water injection wells is the radioactive tracer survey. However, in irregular bore holes, its application becomes limited because a bore hole diameter is required for each flow rate calculation. The actual selection of the bore hole diameters for the flow rate calculations can result in a large uncertainty in the injection profile. The results of the interface survey are independent of the use of a bore hole diameter for the injection profile calculations. Therefore, the interface survey can be used with confidence in irregular boreholes. The interface survey does require a different well completion design from the radioactive tracer survey so that water can be injected down the annulus and tubing simultaneously. By ejecting water soluble radioactive material in the tubing steam, the interface created by the radioactive and non-radioactive waters can be located with a Gamma Ray detector. By changing the rates of annulus and tubing flow, the interface can be moved up hole or down hole

  3. Research on Valve Body Design of Large Bore Sodium Valve

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    Large bore sodium valve is one kind of key equipments of China Demonstration Fast Reactor (CDFR). It is installed in the pipeline before and behind SG units as a locking mechanism. Valve body which is used to bear pressure is the core of sodium valve design.

  4. Ultrasonic inspection methods for small-bore applications

    International Nuclear Information System (INIS)

    The nondestructive inspection of tubing and tube-to-tubesheet weldments in heat exchangers for reactor systems is necessary to ensure the high integrity essential for safe, reliable, continuously operating units. An ultrasonic inspection system has been developed for small-bore applications. The current system can be used to inspect tubing or weldments with bores as small as 10.1 mm (0.4 in.) for transversely or longitudinally oriented discontinuities; however, similar inspections are possible within even smaller bores. Since the probe head is rotated to provide inspection along a helical path, special ultrasonic signal connectors are employed. The miniature probe heads employed are designed for rapid exchange in the mechanical scanner. These probes use commercially available transducers and are capable of performing various ultrasonic inspections with both single and dual examination techniques. The inspection methods and equipment are discussed, along with results of calibration, recording, and correlation studies performed on laboratory-type specimens. Reference notches with depths representing 2 percent of the wall thickness were detected and recorded from the bore of 15.88 mm OD x 2.77 mm wall (0.625 x 0.109 in.) tubing

  5. Slime thickness evaluation of bored piles by electrical resistivity probe

    Science.gov (United States)

    Chun, Ok-Hyun; Yoon, Hyung-Koo; Park, Min-Chul; Lee, Jong-Sub

    2014-09-01

    The bottoms of bored piles are generally stacked with soil particles, both while boreholes are being drilled, and afterward. The stacked soils are called slime, and when loads are applied on the pile, increase the pile settlement. Thus to guarantee the end bearing capacity of bored piles, the slime thickness should be precisely detected. The objective of this study is to suggest a new method for evaluating the slime thickness, using temperature compensated electrical resistivity. Laboratory studies are performed in advance, to estimate and compare the resolution of the electrical resistivity probe (ERP) and time domain reflectometry (TDR). The electrical properties of the ERP and TDR are measured using coaxial type electrodes and parallel type two-wire electrodes, respectively. Penetration tests, conducted in the fully saturated sand-clay mixtures, demonstrate that the ERP produces a better resolution of layer detection than TDR. Thus, field application tests using the ERP with a diameter of 35.7 mm are conducted for the investigation of slime thickness in large diameter bored piles. Field tests show that the slime layers are clearly identified by the ERP: the electrical resistivity dramatically increases at the interface between the slurry and slime layer. The electrical resistivity in the slurry layer inversely correlates with the amount of circulated water. This study suggests that the new electrical resistivity method may be a useful method for the investigation of the slime thickness in bored piles.

  6. Quality Designed Twin Wire Arc Spraying of Aluminum Bores

    Science.gov (United States)

    König, Johannes; Lahres, Michael; Methner, Oliver

    2015-01-01

    After 125 years of development in combustion engines, the attractiveness of these powerplants still gains a great deal of attention. The efficiency of engines has been increased continuously through numerous innovations during the last years. Especially in the field of motor engineering, consequent friction optimization leads to cost-effective fuel consumption advantages and a CO2 reduction. This is the motivation and adjusting lever of NANOSLIDE® from Mercedes-Benz. The twin wire arc-spraying process of the aluminum bore creates a thin, iron-carbon-alloyed coating which is surface-finished through honing. Due to the continuous development in engines, the coating strategies must be adapted in parallel to achieve a quality-conformed coating result. The most important factors to this end are the controlled indemnification of a minimal coating thickness and a homogeneous coating deposition of the complete bore. A specific system enables the measuring and adjusting of the part and the central plunging of the coating torch into the bore to achieve a homogeneous coating thickness. Before and after measurement of the bore diameter enables conclusions about the coating thickness. A software tool specifically developed for coating deposition can transfer this information to a model that predicts the coating deposition as a function of the coating strategy.

  7. Procedure for seismic evaluation and design of small bore piping

    International Nuclear Information System (INIS)

    Simplified methods for the seismic design of small bore piping in nuclear power plants have teen used for many years. Various number of designers have developed unique methods to treat the large number of class 2 and 3 small bore piping systems. This practice has led to a proliferation of methods which are not standardized in the industry. These methods are generally based on enveloping the results of rigorous dynamic or conservative static analysis and result in an excessive number of supports and unrealistically high support loadings. Experience and test data have become available which warranted taking another look at the present methods for analysis of small bore piping. A recently completed Electric Power Research Institute and NCIG (a utility group) activity developed a new procedure for the seismic design and evaluation of small bore piping which provides significant safety and cost benefits. The procedure streamlines the approach to inertial stresses, which is the main feature that achieves the new benefits. Criteria in the procedure for seismic anchor movement and support design are based analysis and focus the designer on credible failure mechanisms. A walkdown of the as-constructed piping system to identify and eliminate undesirable piping features such as adverse spatial interaction is required

  8. Field screening of a fuel farm using hand auger borings

    International Nuclear Information System (INIS)

    Twenty-seven hand auger borings were drilled within and around the northern fuel farm at Naval Air Station Moffett Field, California. The placement and depth of: (1) hand auger borings, (2) deep soil borings and (3) monitoring wells were established to define the horizontal extent of field-detected contamination. Upon delineation of the hydrocarbon plume and the buried channel deposit, two A1 aquifer monitoring wells and three free product wells were installed. Each location was initialized as a sod boring employing continuous core drilling for stratigraphic information. The two monitoring wells were screened within sand units exhibiting substantial levels of contaminants detected using a photoionizer. The three free product wells were installed in keeping within the scope of the work plan which required that a free product well be installed wherever free product was observed on the ground-water in the open borehole. The three locations contained thicknesses from 1 to 3 mm of yellow oily product when measured with a clear acrylic bailer in the open 'hand auger' hole. After installation of the two monitoring wells and the additional installation of observation wells, one aquifer test was conducted to acquire hydrogeologic data for fate and transport modeling and remediation of the area. This paper will discuss a field study that used hand augers as a screening method. This method provided a cost-effective means of delineating the horizontal extent of a shallow hydrocarbon plume, defined the extent of a free product plume, defined aquifer characteristics and aided in the proper selection of well location and screen placement. The paper demonstrates how the field screening method of hand augered borings resulted in optimum monitoring well placement by discussion of groundwater analytical results from the monitoring wells, geologic data and aquifer tests from the selectively placed monitoring wells

  9. Technical Diagnostics of Tank Cannon Smooth Barrel Bore and Ramming Device

    OpenAIRE

    Jiri Balla; Stanislav Prochazka; Robert Jankovych; Stanislav Beer; Zbynek Krist; Michal Kovarik

    2015-01-01

    The technical diagnostics of 125 mm tank cannon 2A46 smooth barrel and ramming devices are discussed respectively. Focuses on barrel diagnostics and suggests new procedures based on reconstructed BG20 Gun Barrel Bore Gauge System, measuring internal diameter of the barrel bore. The new system measures throughout the whole barrel bore the inner diameter not only at the beginning of barrel bore as it was usually measured before. Different nature of barrel wear was revealed between barrels firin...

  10. Study on influence of ground settlement in bored metro tunnel

    Institute of Scientific and Technical Information of China (English)

    FANG Jiang-hua; ZHANG Zhi-hong

    2006-01-01

    At present the bored construction method is one of the main construction methods of metro and tunnel construction in China. The empirical estimated formulas of tunnel ground surface settlement using the bored construction method were obtained,combining the mechanical stimulant calculated result of tunnel model of different embedded depth, different cross section and different construction method and the actual measurement data of Beijing metro construction. According to the regressed analysis of calculated data, the calculated equations of ground surface settlement value and settlement range of tunnel section under the condition of different embedded depth, different cross section and different construction method were gained. Among them there are some empirical formulas can apply to the construction design ofmetro tunnel directly.

  11. Von der Finanzialisierung zurück zum Boring Banking?

    OpenAIRE

    Scherrer, Christoph

    2013-01-01

    Is it possible to return to the seemingly boring, but stable banking of the Glass-Steagall era without the securitization of financial products? This article tries to answer this question by first consulting a number of theoretical approaches to finance: neoclassical economics, modern finance theory, Keynesianism, Marxism with some of its modern variants. They differ not only in terms of its desirability but also of its likelihood of being realized. Second, the articles explores the possibili...

  12. Application of water jet cutting for tunnel boring

    OpenAIRE

    Nygårdsvoll, Erik

    2014-01-01

    Water jet cutting has proven to be an effective technology for machining various materials, and providing a distinctive advantage over other cutting methods. Its application in the engineering industry is evolving and improving annually, and is one of the fastest growing machining processes. This thesis addresses the idea of applying water jet cutting technology as a new method for boring through rock in the construction of infrastructural tunnels. So far water jets have only b...

  13. Bore-hole survey at Camp Century, 1989

    DEFF Research Database (Denmark)

    Dahl-Jensen, Dorthe; Gundestrup, NS.; Hansen, BL.; kelty, J.

    1993-01-01

    A combination of the directional surveys of the Camp Century borehole from 1966, 1967, 1969 and 1989 has revealed a deformation pattern similar to that measured at Dye-3, South Greenland and Byrd Station, Antarctica showing high deformation rate for Wisconsin ice. Compared to the Dye-3 profile, t...... deformation shows the same pattern even in details. The surface velocity obtained by integrating the bore hole deformation is in agreement with that obtained from satellite measurements Udgivelsesdato: jan...

  14. Anisotropie des transitions interbandes dans le nitrure de bore hexagonal

    OpenAIRE

    Mamy, R.; Thomas, J; Jezequel, G.; Lemonnier, J.C.

    1981-01-01

    Les fonctions diélectriques ordinaires et extraordinaires du nitrure de bore hexagonal ont été calculées à partir de mesures multi-angle du pouvoir réflecteur pour une énergie de rayonnement de 5 eV à 30 eV. Les spectres obtenus sont discutés en termes de transitions interbandes.

  15. Interaction between groundwater and TBM (Tunnel Boring Machine) excavated tunnels

    OpenAIRE

    Font Capó, Jordi

    2012-01-01

    A number of problems, e.g. sudden inflows are encountered during tunneling under the piezometric level, especially when the excavation crosses high transmissivity areas. These inflows may drag materials when the tunnel crosses low competent layers, resulting in subsidence, chimney formation and collapses. Moreover, inflows can lead to a decrease in head level because of aquifer drainage. Tunnels can be drilled by a tunnel boring machine (TBM) to minimize inflows and groundwater impacts, restr...

  16. Speed Regulator for Permanent Magnet DC Boring Machine

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    In this paper a variable-speed system for a loaded permanent magnet direct current boring machine (PMDCBM) is described in details. The voltage adjustment of PMDCBM is accomplished by means of solid state switch with a high gain Darlington transistor. The device designed possesses good variable speed characteristic and Iow loss at low speed. The speed can be regulated automatically to hold at an ideal value according to the load.

  17. Downhole temperature tool accurately measures well bore profile

    International Nuclear Information System (INIS)

    This paper reports that an inexpensive temperature tool provides accurate temperatures measurements during drilling operations for better design of cement jobs, workovers, well stimulation, and well bore hydraulics. Valid temperature data during specific wellbore operations can improve initial job design, fluid testing, and slurry placement, ultimately enhancing well bore performance. This improvement applies to cement slurries, breaker activation for slurries, breaker activation for stimulation and profile control, and fluid rheological properties for all downhole operations. The temperature tool has been run standalone mounted inside drill pipe, on slick wire line and braided cable, and as a free-falltool. It has also been run piggyback on both directional surveys (slick line and free-fall) and standard logging runs. This temperature measuring system has been used extensively in field well bores to depths of 20,000 ft. The temperature tool is completely reusable in the field, ever similar to the standard directional survey tools used on may drilling rigs. The system includes a small, rugged, programmable temperature sensor, a standard body housing, various adapters for specific applications, and a personal computer (PC) interface

  18. In-Situ Test and Numerical Analysis of Bore Pressure on Sheet-Pile Groin

    Institute of Scientific and Technical Information of China (English)

    XU Chang-jie; CAI Yuan-qiang; XUAN Wei-li; CHEN Hai-jun; SONG Yang

    2006-01-01

    An in-situ test of bore pressure on a sheet-pile groin is carried out to investigate the characteristics of the bore pressure of tide in the Qian-tang River. The histories of bore pressure and the rule of the distribution of bore pressure on the sheet-pile groin are obtained through the test, which shows that the bore pressure on the sheet-pile groin are varies with time and space. The peak value of bore pressure on sheet-pile groin at different heights occurs almost at the same time. The vertical distribution of bore pressure on the sheet-pile groin is linear above the still water level. The maximum bore pressure on the sheet-pile groin occurs at the still water level. Then a numerical method is also used to further study the characteristics of bore pressure. The standard κ-ε turbulence model and VOF (volume of fluid) method for surface tracking are used to simulate the bore against the sheet-pile groin. The numerical results show flow fields, the position of free surface and time history and spatial distribution of bore pressure on the sheet-pile groin. The numerical and test results show good agreement.

  19. Shaft friction of bored piles in hard clay

    International Nuclear Information System (INIS)

    The precise prediction of maximum load carrying capacity of bored piles is a complex problem because it is a function of a number of factor. These factor include method of boring, method of concreting. quality of concrete, expertise of the construction staff, the ground conditions etc. besides the pile geometry. The performance of pile load test is therefore, of paramount importance to establish the most economical design of piles especially where bored cast-in-situ piles are to be provided to support a structure. This paper describes the experience gained from four pile load test at a site in the North West Frontier Province of Pakistan where a new cement plant is going to be installed. Geotechnical investigations at the side were carried out to a maximum depth of 60 m. The subsoils at the site are predominantly hard clays within the investigated depth with thin layer of gravels boulders below 40 m depth. Perched water was encountered at various horizons. Four piles of diameter varying from 660 mm to 760 mm and length ranging between 20 m and 47.5 m were subjected to axial loads. The load test data were analyzed using various state of the art techniques including intercept of two tangents, point of change of slope 6 mm net settlement (1), 90 percent and 80 percent Hansen (7), limit value Davisson (2), and Chin (3). Based on a comparison of pile capacities from these methods with the theoretical values, recommendations are made on the approach to estimate the pile capacity in hard clays. Using the pile load test result back calculations were also carried out 10 estimate the appropriate values of pile design parameter such as undrained cohesion and adhesion factor. (author)

  20. Grouting guidelines for Hanford Tanks Initiative cone penetrometer borings

    International Nuclear Information System (INIS)

    Grouting of an open cone penetrometer (CP) borehole is done to construct a barrier that prevents the vertical migration of fluids and contaminants between geologic units and aquifers intersected by the boring. Whether to grout, the types of grout, and the method of deployment are functions of the site-specific conditions. This report recommends the strategy that should be followed both before and during HTI [Hanford Tanks Initiative] CP deployment to decide specific borehole grouting needs at Hanford SST farms. Topics discussed in this report that bear on this strategy include: Regulatory guidance, hydrogeologic conditions, operational factors, specific CP grouting deployment recommendations

  1. Development of a seismic self-boring pressuremeter

    OpenAIRE

    Reiffsteck, Philippe; NGUYEN PHAM, Phuong Thao; REVERDY, G

    2008-01-01

    Development of a new self-boring pressuremeter has been the opportunity to insert geophone in the body of the probe. Placed in the shoe and the head of the probe, the geophones allow the determination of compression (P) and shear (S) wave velocities close to the cavity subjected to the expansion. To simplify the data acquisition, all hardware and software components are designed to run with a notebook computer connected to a signal conditioning system. The determination of P-wave and S-wave a...

  2. Estimation of the equilibrium formation temperature in the presence of bore fluid invasion

    DEFF Research Database (Denmark)

    Poulsen, Søren Erbs; Nielsen, S.B.; Balling, N.

    2012-01-01

    . Allowing for bore fluid invasion in addition to a borehole of finite radius and contrasting thermal parameters, increases temperature estimates by 5 per cent (4–7 per cent) on average given that invasion is indicated and that the bore fluid is significantly colder than the formation. Indications of bore......Bottom hole temperatures (BHTs) measured during drilling operations are thermally disturbed by the drilling process. This paper presents a method, CSMI (Cylindrical Source Model with Invasion of bore mud filtrate), for estimating equilibrium formation temperatures with probability distributions...... possibility of invasion (advection) of mud filtrate into the formation. In a synthetic example, it is demonstrated that given bore fluid invasion and a low and high temperature of the bore mud and formation, respectively, the equilibrium formation temperature and the uncertainty hereon is underestimated by...

  3. Dynamics of Magnetic Insulation Violation in Smooth-bore Magnetrons

    Science.gov (United States)

    Agafonov, A. V.; Fedorov, V. M.; Tarakanov, V. P.

    1997-05-01

    The efficiency of large and high-power magnetrons of GW power levels is less than 30% and an inherent pulse-length and repetition rate limitations seems to exist because of use of explosive field emission. Another approach is the development of low voltage high-efficiency magnetrons utilizing a secondary emission magnetron array with high repetition rate. The numerical model of nonstationary nonuniform secondary electron emission from a cathode surface has been developed. The results of the first steps in computer simulations of an electron cloud formation inside a smooth-bore magnetron under the condition of the back-bombardement instability (BBI) are presented. A mechanism of the violation of the magnetic insulation are considered. Calculations have been performed for a coaxial smooth-bore magnetron and for magnetrons with different types of azimuthal inhomogeneities which could help the grow of BBI, and for magnetrons of different aspect ratios. The results of computer simulation are compared with experimental data. The main calculations of the beam dynamics were carried out with PIC-code KARAT.

  4. Gun bore flaw image matching based on improved SIFT descriptor

    Science.gov (United States)

    Zeng, Luan; Xiong, Wei; Zhai, You

    2013-01-01

    In order to increase the operation speed and matching ability of SIFT algorithm, the SIFT descriptor and matching strategy are improved. First, a method of constructing feature descriptor based on sector area is proposed. By computing the gradients histogram of location bins which are parted into 6 sector areas, a descriptor with 48 dimensions is constituted. It can reduce the dimension of feature vector and decrease the complexity of structuring descriptor. Second, it introduce a strategy that partitions the circular region into 6 identical sector areas starting from the dominate orientation. Consequently, the computational complexity is reduced due to cancellation of rotation operation for the area. The experimental results indicate that comparing with the OpenCV SIFT arithmetic, the average matching speed of the new method increase by about 55.86%. The matching veracity can be increased even under some variation of view point, illumination, rotation, scale and out of focus. The new method got satisfied results in gun bore flaw image matching. Keywords: Metrology, Flaw image matching, Gun bore, Feature descriptor

  5. Control paraffin with well bore insulating gelled fluids

    Energy Technology Data Exchange (ETDEWEB)

    Yousif, M.H.; Young, D.B. (IITRI, Houston, TX (United States)); Black, J.W.

    1994-10-01

    A variety of techniques are used to treat paraffin, including scrapping, pigging, heating, insulating and solvent usage. Well bore insulating fluids control paraffin deposition in offshore wells by producing a high cloud point oil from a relatively cold reservoir. Produced hydrocarbons exhibit large pressure and temperature changes from the formation to the surface facilities. This changes their phase behavior and consequently their carrying capacity of the dissolved paraffins. Paraffins can drop out in the producing formation, subsurface pumps, tubing, flowline, separators and storage tanks. Paraffins can be low molecular weight n-alkanes (C20-C40) or high molecular weight iso-alkanes and cyclic alkanes. Heat convection through the annulus is the main mechanism by which produced fluids lose heat to surrounding formations. Consequently, selecting a well bore insulating fluid should not be based entirely on thermal conductivity of the fluid. Although their thermal conductivity is only 2.5% that of water, fluids like mineral oil or diesel could transfer as much heat as water under the same temperature gradient. Testing shows that the viscosity of the annular fluid is the key parameter that needs to be increased to minimize annular convective heat loses.

  6. Study of an Industrial FEM tool for line boring process of cylinder blocks

    OpenAIRE

    TABIBIAN, Shadan; Lorong, Philippe

    2015-01-01

    The aim of this study is to realize a simple simulation tool, in order to predict the form defect of cylinder block bore liners in the moment of rough boring process. In this study a simple static FEM model, based on the cylinder block geometry, is proposed to predict the form defect of the bore liners in the moment of process.The simulation results put forward that the clamping condition plays an import role in the bore distortion. Consequently, optimizing the clamping pressure and its local...

  7. TRANSMISSION BEHAVIOR OF MUD-PRESSURE PULSE ALONG WELL BORE

    Institute of Scientific and Technical Information of China (English)

    LIU Xiu-shan; LI Bo; YUE Yu-quan

    2007-01-01

    In oil and gas industry, mud-pulse telemetry has been widely used to obtain directional data, drilling parameters, formation evaluation data and safety data, etc. Generally, the drilling mud in most current models was considered to be a single-phase fluid through which the mud pulses travel, despite the fact that the drilling mud is composed of two or more phases. In this article, a multiphase flow formula was proposed to calculate the mud-pulse velocity as mud solids and free-gas content change, and a mathematical model was put forward to simulate the dynamic-transmission behavior of the mud-pressure pulse or waves. Compared to conventional methods, the present model provides more accurate mud-pulse attenuation, and the dynamic-transmission behavior of drilling-mud pulses along well bores can also be easily examined. The model is valuable in improving the existing mud-pulse systems and developing new drilling-mud pulse systems.

  8. Ten years of bored tunnels in the Netherlands: Part II: Structural issues

    NARCIS (Netherlands)

    Bakker, K.J.; Bezuijen, A.

    2008-01-01

    In 1997 for the first time construction of bored tunnels in the Netherlands soft soil was undertaken. Before that date essentially only immersed tunnels and cut-and-cover tunnels were constructed in the Netherlands. The first two bored tunnels were Pilot Projects, the 2nd Heinenoord tunnel and the B

  9. Analysis of dynamic properties of boring bars concerning different clamping conditions

    Science.gov (United States)

    Åkesson, Henrik; Smirnova, Tatiana; Håkansson, Lars

    2009-11-01

    Boring bars are frequently used in the manufacturing industry to turn deep cavities in workpieces and are usually associated with vibration problems. This paper focuses on the clamping properties' influence on the dynamic properties of clamped boring bars. A standard clamping housing of the variety commonly used in industry today has been used. Both a standard boring bar and a modified boring bar have been considered. Two methods have been used: Euler-Bernoulli beam modeling and experimental modal analysis. It is demonstrated that the number of clamping screws, the clamping screw diameter sizes, the screw tightening torques, the order the screws are tightened has a significant influence on a clamped boring bars eigenfrequencies and its mode shapes orientation in the cutting speed—cutting depth plane. Also, the damping of the modes is influenced. The results indicate that multi-span Euler-Bernoulli beam models with pinned boundary condition or elastic boundary condition modeling the clamping are preferable as compared to a fixed-free Euler-Bernoulli beam for modeling dynamic properties of a clamped boring bar. It is also demonstrated that a standard clamping housing clamping a boring bar with clamping screws imposes non-linear dynamic boring bar behavior.

  10. Ten Years of bored tunnels in the Netherlands: Part I: Geotechnical issues

    NARCIS (Netherlands)

    Bakker, K.J.; Bezuijen, A.

    2008-01-01

    Ten years have passed since in 1997 for the first time construction of bored tunnels in the Netherlands soft soil was undertaken. Before that date essentially only immersed tunnels and cut-and-cover tunnels were constructed in the Netherlands. The first two bored tunnels were Pilot Projects, the 2nd

  11. Seismic monitoring experiment of raise boring in 2014

    Energy Technology Data Exchange (ETDEWEB)

    Saari, J.; Malm, M. [AaF-Consult Oy, Espoo (Finland)

    2015-01-15

    In Olkiluoto, Posiva Oy has operated a local seismic network since February 2002. The purpose of the microearthquake measurements at Olkiluoto is to improve understanding of the structure, behaviour and long term stability of the bedrock. The studies include both tectonic and excavation-induced microearthquakes. An additional task of monitoring is related to safeguarding of ONKALO. The possibility to excavate an illegal access to ONKALO has been concerned when the safeguards are discussed. Therefore all recorded explosions in the Olkiluoto area and in ONKALO are located. If a concentration of explosions is observed, the origin of that is found out. Also a concept of hidden illegal explosions, detonated at the same time as the real excavation blasts, has been examined. According to the experience gained in Olkiluoto, it can be concluded that, as long the seismic network is in operation and the results are analysed by a skilled person, it is practically impossible to do illegal undetected excavation by blasting within the Olkiluoto seismic network area. In this report a possibility of seismic monitoring of undeclared excavation done by tunnel boring machine (TBM) has been investigated. In the earlier investigations the instruments were at the ground surface and the sensors were triaxial short period (1 Hz) geophones or broadband geophones. The characteristics (frequency content, polarity and amplitude) of the continuous seismic vibration generated by TMB were studied. The onset time of the seismic signal were not distinguished. Altogether 16 new 10 kHz accelerometers were installed in boreholes inside ONKALO March 2012. The sensors comprised a new subnetwork that monitored the raise boring of two shafts done 2014, from the level -455 m to the level -290 m. The aim was to record the seismic signal generated when the drill bit hits the rock at the moment the tunnel boring begins. Altogether 113 seismic signals generated by the drill bit were located during the

  12. Seismic monitoring experiment of raise boring in 2014

    International Nuclear Information System (INIS)

    In Olkiluoto, Posiva Oy has operated a local seismic network since February 2002. The purpose of the microearthquake measurements at Olkiluoto is to improve understanding of the structure, behaviour and long term stability of the bedrock. The studies include both tectonic and excavation-induced microearthquakes. An additional task of monitoring is related to safeguarding of ONKALO. The possibility to excavate an illegal access to ONKALO has been concerned when the safeguards are discussed. Therefore all recorded explosions in the Olkiluoto area and in ONKALO are located. If a concentration of explosions is observed, the origin of that is found out. Also a concept of hidden illegal explosions, detonated at the same time as the real excavation blasts, has been examined. According to the experience gained in Olkiluoto, it can be concluded that, as long the seismic network is in operation and the results are analysed by a skilled person, it is practically impossible to do illegal undetected excavation by blasting within the Olkiluoto seismic network area. In this report a possibility of seismic monitoring of undeclared excavation done by tunnel boring machine (TBM) has been investigated. In the earlier investigations the instruments were at the ground surface and the sensors were triaxial short period (1 Hz) geophones or broadband geophones. The characteristics (frequency content, polarity and amplitude) of the continuous seismic vibration generated by TMB were studied. The onset time of the seismic signal were not distinguished. Altogether 16 new 10 kHz accelerometers were installed in boreholes inside ONKALO March 2012. The sensors comprised a new subnetwork that monitored the raise boring of two shafts done 2014, from the level -455 m to the level -290 m. The aim was to record the seismic signal generated when the drill bit hits the rock at the moment the tunnel boring begins. Altogether 113 seismic signals generated by the drill bit were located during the

  13. Mixing and sediment resuspension associated with internal bores in a shallow bay

    Science.gov (United States)

    Masunaga, Eiji; Homma, Hikaru; Yamazaki, Hidekatsu; Fringer, Oliver B.; Nagai, Takeyoshi; Kitade, Yujiro; Okayasu, Akio

    2015-11-01

    Observations of the run-up of internal bores in a shallow bay were made with a tow-yo instrument and mooring arrays with high spatial and temporal resolution. Shoreward propagating internal bores have been studied with laboratory experiments and numerical models, but few observational studies have shown the detailed structure of the run-up of internal bores induced by internal tides. Our observations showed that internal bores propagate along the slope, accompanied by strong turbulent mixing and strong sediment resuspension in a shallow bay. The isothermal displacement due to the bores reached 20 m vertically in a water depth of 40 m. Turbidity measurements showed suspended particles transported from the sloping bottom and offshore above the thermocline, forming an intermediate nepheloid layer (INL). At the head of the bore (dense water), a vortex accompanied by strong vertical motion induced strong vertical sediment resuspension and a steep isothermal displacement. The rate of turbulent kinetic energy dissipation reached 10-6 W kg-1 at the head of the wave. A nonhydrostatic numerical simulation in a two-dimensional domain reproduced fine features associated with the run-up of an internal bore and the vortex motion at its head.

  14. Analytical and numerical analyses of hydrologic well-bore experiments

    International Nuclear Information System (INIS)

    An analytical approximate method and a finite-difference numerical model (based on the rate at which a borehole fills with water) were developed to estimate permeability of the Magenta Formation in southeastern New Mexico near the proposed Waste Isolation Pilot Project (WIPP) site. The analytical treatment applies to certain simple geometries with idealized boundary conditions (constant properties, ground water compressibility negligible). Permissible geometries include water-collecting cylinders with large needle-like aspect ratios located beneath the water table. The analytical treatment clearly shows the sensitivity of inferences and conclusions to material properties and geometries. Much of the existing well-bore fill-rate data fall within the range of validity of this simplified analysis. Admission of compressibility effects into the generalized Darcy law, and a nondimensionalization of the equations identify the range of experimental conditions and material properties for which the approximations are invalid. In the numerical capability to complement this analytical treatment, numerous restrictions have been removed so that the code can treat complex geometries for a variety of boundary conditions and variable properties. The compressibility term that is excluded in the analytical treatment is maintained in these numerical solutions. The resulting equations are formally parabolicand can be solved by an implicit integrator with guaranteed stability. The two methods, applied to several different experimental situations, agree with each other. 9 figures, 3 tables

  15. Turbulent mixing and wave radiation in non-Boussinesq internal bores

    DEFF Research Database (Denmark)

    Borden, Zac; Koblitz, Tilman; Meiburg, Eckart

    2012-01-01

    -layer hydraulic model will accurately predict a bore's speed of propagation. A two-layer model is required, however, if the densities are more similar. Mass is conserved separately in each layer and momentum is conserved globally, but the model requires for closure an assumption about the loss of energy across a...... bore. In the Boussinesq limit, it is known that there is a decrease of the total energy flux across a bore, but in the expanding layer, turbulent mixing at the interface entrains high speed fluid from the contracting layer, resulting in an increase in the flux of kinetic energy across the expanding...

  16. EFFECT OF SPUTTERING PARAMETERS ON TANTALUM COATINGS FOR GUN BORE APPLICATIONS

    Science.gov (United States)

    Tantalum offers a number of attractive properties for gun bore coating applications, including a high melting temperature, high ductility, and an environmentally friendly deposition method. However, vapor-deposited tantalum can appear in both the characteristic body-centered-cubi...

  17. The research of the stud bolt bore checking equipment of the nuclear reactor pressure vessel

    International Nuclear Information System (INIS)

    This article introduces a kind of new equipment that can work under the environment of high radiation and can-automaticly check the main stud bolt bore. The technical parameters and key techniques of the checking equipment are presented. (authors)

  18. Simulation of Single Reed Instruments Oscillations Based on Modal Decomposition of Bore and Reed Dynamics

    CERN Document Server

    Silva, Fabrice; Kergomard, Jean; Vergez, Christophe; Deblevid, Aude; Guillemain, Philippe

    2007-01-01

    This paper investigates the sound production in a system made of a bore coupled with a reed valve. Extending previous work (Debut, 2004), the input impedance of the bore is projected on the modes of the air column. The acoustic pressure is therefore calculated as the sum of modal components. The airrrflow blown into the bore is modulated by reed motion, assuming the reed to be a single degree of freedom oscillator. Calculation of self-sustained oscillations controlled by time-varying mouth pressure and player's embouchure parameter is performed using ODE solvers. Results emphasize the par ticipation of the whole set of components in the mode locking process. Another impor tant feature is the mutual innnfluence of reed and bore resonance during growing blowing pressure transients, oscillation threshold being altered by the reed natural frequency and the reed damping. Steady-state oscillations are also investigated and compared with results given by harmonic balance method ...

  19. Application of an extrusion starch-bearing reagent with the boring of salt deposits

    Energy Technology Data Exchange (ETDEWEB)

    Denisova, L.P.; Timoshchuk, Iu.D.

    1981-01-01

    As a result of the extrusion processing of corn matter, an extrusion starch-bearing reagent, which yields itself in quality to modified MK-1 starch, has been created. The advantage of the extrusion starch-bearing reagent is long-time preservation of the properties of the boring solution and the absence of complications in a the shaft of the well, the preservation of the frequency of the processes of the boring solution.

  20. Soil thrust boring plant of static action with ring spacers of horizontal wells

    OpenAIRE

    V.A. Penchuk; V.K. Rudnev; N.V. Saenko; V.N. Suponev; V.I. Oleksyn; S.P. Balesniy; S.M. Vivchar

    2015-01-01

    The combined method of horizontal wells development by a soil thrust boring plant of static action with cutting rings has been proposed. The ratio between the diameters of the cutting ring and horizontal well has been determined. The regression equation was received to determine a minimum depth of a horizontal well laying depending on the diameter of the bore hole and soil porosity. The dependencies for determining emerging forces while developing a horizontal well with a cutting ring and...

  1. Effect of fluid viscosity on wave propagation in a cylindrical bore in micropolar elastic medium

    Indian Academy of Sciences (India)

    Sunita Deswal; Sushil K Tomar; Rajneesh Kumar

    2000-10-01

    Wave propagation in a cylindrical bore filled with viscous liquid and situated in a micropolar elastic medium of infinite extent is studied. Frequency equation for surface wave propagation near the surface of the cylindrical bore is obtained and the effect of viscosity and micropolarity on dispersion curves is observed. The earlier problems of Biot and of Banerji and Sengupta have been reduced as a special case of our problem.

  2. Improvement of machining accuracy in precision micro-boring system by forecasting compensatory control technique

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    Presents the design of a micro-boring servo system. A piezoelectric actuator is employed to compensate the deflection errors of the cutter in the radial direction to reduce the force-induced errors in the workpiece. In order to bore small and deep holes, the boring bar is designed with a new structure consisting of two concentric bars, one being used for error measuring and the other for error compensation. As a result, the size of the micro-boring bar is not af fected even after the piezoelectric actuator and strain gauges have been incorporated. The outer diameter of the boring bar used is 16 mm and the length to diameter ratio is greater than 9. A Forecasting Compensatory Control (FCC) technique is adopted in this system for error prediction and error compensation. The off-line forecasting compensatory control simulation and on-line cutting results have verified that the roundness form errors in the workpiece can be re duced up to 60 percent with the developed micro-boring servo system.

  3. Method Cement Post-grouting to Increase the Load Capacity for Bored Pile

    Directory of Open Access Journals (Sweden)

    Van Loc Nguyen

    2013-05-01

    Full Text Available Drilled shafts foundations are used as an indispensable solution for long span bridges in Vietnam. In order to increase the bearing capacity, aside from the increasing of the pile length and diameter, an interested way now is treatment of pile bases after concrete placement. This study is aimed at investigating the defect at the bottom of the bored pile from the sonic test. The injection of hight pressure of cement grout to the shaft and tip of the defected bored pile was conducted to increase the bearing capacity of pile. The bearing capacity of defected bored pile is calculated by the TCXD-205:1998 an finite element mothod. After post-grouting technique done, the soil investigation tests have been carried out to define the properties of treated soils. The analytic mothod, finite element method an load test also have been applied to determine the bearing capacity of treated bored pile. The results show that the post-grouting to the shaft and tip of pile can increase two times of bearing capacity of defected bored pile and about 20% compared to the normal bored pile.

  4. Improvement of the center boring device for the irradiated fuel pellets

    International Nuclear Information System (INIS)

    The power ramp tests performed at JMTR in Oarai R and D Center are objected to study the safety margin of the high burnup fuels. One of the important parameters measured during this test is the center temperature of the fuel pellet. For this measurement, a thermocouple is installed into the hole bored at the pellet center by the center boring device, which can fix the fuel pellet with the frozen CO2 gas during its boring process. At the Reactor Fuel Examination Facility (RFEF) in Tokai R and D Center, several improvements were applied for the previous boring device to gain its performance and reliability. The major improvements are the change of the drill bit, modification of the boring process and the optimization of the remote operability. The mock-up test will be performed with the irradiated fuel pellet to confirm the benefit of improvement. This study was conducted under a contract with the Nuclear and Industrial Safety Agency (NISA) of the Ministry of Economy, Trade and Industry (METI). (author)

  5. Torsional Guided Wave Inspection for the Small Bore Tubes using Magnetostrictive Transducer

    International Nuclear Information System (INIS)

    A magnetostrictive transducer was applied to investigate the guided wave propagation and the effect of outer supports of a small bore tube. The width of Ni strip for the static magnetic bias was optimized for the small bore tube. Because of the geometrical limitation of Ni strip, a F(1,1) mode vibration was accompanied with the main T(0,1) mode vibration. In the viewpoint of long range attenuation the L(0,1) mode vibration is better than the T(0,1) mode vibration for the case of the small bore tube and unwanted signals from the tube holders or pads were not able to eliminate or suppressed in this experiment. After the review of various wave structures and dispersion characteristics of the tube, the frequency and vibration mode could be optimized to reduce the reflections from those outer support structures.

  6. Soil thrust boring plant of static action with ring spacers of horizontal wells

    Directory of Open Access Journals (Sweden)

    V.A. Penchuk

    2015-03-01

    Full Text Available The combined method of horizontal wells development by a soil thrust boring plant of static action with cutting rings has been proposed. The ratio between the diameters of the cutting ring and horizontal well has been determined. The regression equation was received to determine a minimum depth of a horizontal well laying depending on the diameter of the bore hole and soil porosity. The dependencies for determining emerging forces while developing a horizontal well with a cutting ring and its cleaning with a disk with account of geometric parameters of the working equipment and soil condition have been established. The general view of the soil thrust boring plant and its working equipment for developing horizontal wells has been presented.

  7. Development of a screening procedure for vibrational fatigue in small bore piping

    International Nuclear Information System (INIS)

    Approximately 80% of the documented fatigue failures in nuclear power plants are caused by high cycle vibrational fatigue. These failures typically occur in socket welded pipe fittings in small bore piping (2 in. nominal diameter and smaller). These failures have been unexpected, and have caused costly, unscheduled outages in some cases. In order to reduce the number of vibrational fatigue failures in operating nuclear power plants, a vibrational fatigue screening procedure has been developed under Electric Power Research Institute (EPRI) sponsorship. The purpose of this paper is to describe this procedure, and to discuss topics related to vibrational fatigue failures. These topics include sources of vibration in nuclear power plants, the effect of socket welds on vibrational fatigue failures, vibrational fatigue screening criteria for small bore piping systems, and good design practices for reducing the number of vibrational fatigue failures in small bore piping

  8. Straddle packer system design and operation for vertical characterization of open bore holes

    International Nuclear Information System (INIS)

    Bore holes open to large intervals provide groundwater samples and test results which represent an unknown integration of properties throughout the depth of the hole. The State of Idaho's INEL Oversight Program is utilizing a custom straddle-packer system to develop a vertical characterization of water chemistry and hydrology in selected open bore holes at the Idaho National Engineering Laboratory. This report describes the design and operation for bore hole zone isolation, water sampling, and hydrologic testing. To reduce potential influences on in situ water chemistry, the system utilizes chemically inert components to the extent possible. Straddle packer systems are effective in producing representative water samples from isolated formations. Hydrologic testing is limited by the ability to produce a measurable stress on the aquifer in individual formations, and head measurement sensitivity. 4 figs

  9. Numerical Modeling of Tsunami Bore Attenuation and Extreme Hydrodynamic Impact Forces Using the SPH Method

    Science.gov (United States)

    Piche, Steffanie

    Understanding the impact of coastal forests on the propagation of rapidly advancing onshore tsunami bores is difficult due to complexity of this phenomenon and the large amount of parameters which must be considered. The research presented in the thesis focuses on understanding the protective effect of the coastal forest on the forces generated by the tsunami and its ability to reduce the propagation and velocity of the incoming tsunami bore. Concern for this method of protecting the coast from tsunamis is based on the effectiveness of the forest and its ability to withstand the impact forces caused by both the bore and the debris carried along by it. The devastation caused by the tsunami has been investigated in recent examples such as the 2011 Tohoku Tsunami in Japan and the Indian Ocean Tsunami which occurred in 2004. This research examines the reduction of the spatial extent of the tsunami bore inundation and runup due to the presence of the coastal forest, and attempts to quantify the impact forces induced by the tsunami bores and debris impact on the structures. This research work was performed using a numerical model based on the Smoothed Particle Hydrodynamics (SPH) method which is a single-phase three-dimensional model. The simulations performed in this study were separated into three sections. The first section focused on the reduction of the extent of the tsunami inundation and the magnitude of the bore velocity by the coastal forest. This section included the analysis of the hydrodynamic forces acting on the individual trees. The second section involved the numerical modeling of some of the physical laboratory experiments performed by researchers at the University of Ottawa, in cooperation with colleagues from the Ocean, Coastal and River Engineering Lab at the National Research Council, Ottawa, in an attempt to validate the movement and impact forces of floating driftwood on a column. The final section modeled the movement and impact of floating debris

  10. In-bore setup and software for 3T MRI-guided transperineal prostate biopsy

    Science.gov (United States)

    Tokuda, Junichi; Tuncali, Kemal; Iordachita, Iulian; Song, Sang-Eun; Fedorov, Andriy; Oguro, Sota; Lasso, Andras; Fennessy, Fiona M.; Tempany, Clare M.; Hata, Nobuhiko

    2012-09-01

    MRI-guided prostate biopsy in conventional closed-bore scanners requires transferring the patient outside the bore during needle insertion due to the constrained in-bore space, causing a safety hazard and limiting image feedback. To address this issue, we present our custom-made in-bore setup and software to support MRI-guided transperineal prostate biopsy in a wide-bore 3 T MRI scanner. The setup consists of a specially designed tabletop and a needle-guiding template with a Z-frame that gives a physician access to the perineum of the patient at the imaging position and allows the physician to perform MRI-guided transperineal biopsy without moving the patient out of the scanner. The software and Z-frame allow registration of the template, target planning and biopsy guidance. Initially, we performed phantom experiments to assess the accuracy of template registration and needle placement in a controlled environment. Subsequently, we embarked on our clinical trial (N = 10). The phantom experiments showed that the translational errors of the template registration along the right-left (RP) and anterior-posterior (AP) axes were 1.1 ± 0.8 and 1.4 ± 1.1 mm, respectively, while the rotational errors around the RL, AP and superior-inferior axes were (0.8 ± 1.0)°, (1.7 ± 1.6)° and (0.0 ± 0.0)°, respectively. The 2D root-mean-square (RMS) needle-placement error was 3 mm. The clinical biopsy procedures were safely carried out in all ten clinical cases with a needle-placement error of 5.4 mm (2D RMS). In conclusion, transperineal prostate biopsy in a wide-bore 3T scanner is feasible using our custom-made tabletop setup and software, which supports manual needle placement without moving the patient out of the magnet.

  11. In-bore setup and software for 3T MRI-guided transperineal prostate biopsy

    International Nuclear Information System (INIS)

    MRI-guided prostate biopsy in conventional closed-bore scanners requires transferring the patient outside the bore during needle insertion due to the constrained in-bore space, causing a safety hazard and limiting image feedback. To address this issue, we present our custom-made in-bore setup and software to support MRI-guided transperineal prostate biopsy in a wide-bore 3 T MRI scanner. The setup consists of a specially designed tabletop and a needle-guiding template with a Z-frame that gives a physician access to the perineum of the patient at the imaging position and allows the physician to perform MRI-guided transperineal biopsy without moving the patient out of the scanner. The software and Z-frame allow registration of the template, target planning and biopsy guidance. Initially, we performed phantom experiments to assess the accuracy of template registration and needle placement in a controlled environment. Subsequently, we embarked on our clinical trial (N = 10). The phantom experiments showed that the translational errors of the template registration along the right–left (RP) and anterior–posterior (AP) axes were 1.1 ± 0.8 and 1.4 ± 1.1 mm, respectively, while the rotational errors around the RL, AP and superior–inferior axes were (0.8 ± 1.0)°, (1.7 ± 1.6)° and (0.0 ± 0.0)°, respectively. The 2D root-mean-square (RMS) needle-placement error was 3 mm. The clinical biopsy procedures were safely carried out in all ten clinical cases with a needle-placement error of 5.4 mm (2D RMS). In conclusion, transperineal prostate biopsy in a wide-bore 3T scanner is feasible using our custom-made tabletop setup and software, which supports manual needle placement without moving the patient out of the magnet. (paper)

  12. Tunnel boring an alternative method in construction of spent fuel repositories

    International Nuclear Information System (INIS)

    In projecting of the final disposal of nuclear waste in geological formations a great importance should be paid to the selection of the tunneling method. The environment of the chosen repository area should not be exposed to any but as minor disturbances as possible by the excavation method applied. This study approaches full face tunneling methods as an alternative to conventional drill-and-blast methods in the construction of spent fuel repository tunnels. According to experiences up till now it is obvious, that tunnelboring today is fully capable technically competing with conventional tunneling methods, even in the hardest granitic rocks. The most important advantages, it provides for the construction of repositories, are: The methods does not produce any damage in the surrounding rock. Possibility to use placement techniques, which do not require preparing of additive repository holes for the fuel elements. Saving in the use of expensive filling material. The fact, that tunnel boring in hard rock is an expensive alternative, is still valid. Constuction of straight lined tunnels in unfractured rocks by tunnel boring would cost about 30-40% more than by conventional methods. The lay out arrangement of bored tunnels still have a great influence on tunnel boring machine's economy. Due to this it would be round 40-70% more expensive method in the construction of spent fuel repositories. However intensive development w is being carried out to eliminate these limitations and to make machines more flexible. Future trends in tunnel boring look good at the moment. The number of sold units has been increasing and new applications have widen out during last ten years. Harder and more abrasive rocks can now be bored than ever before and the trend seems to continue. It also looks like the cost difference in the hardest rocks is firmly getting smaller and smaller all the time. (author)

  13. The particle simulation study of mechanism of laser boring in overdense plasma

    International Nuclear Information System (INIS)

    The interaction of ultrahigh intensity laser with overdense plasma is studied using a 2.5D particle simulation code. A channel is formed due to the extremely large ponderomotive force associated with laser pulse. Strong self-generated magnetic fields produced by strong flow of high-energy electrons are observed. Three kinds of spatial profiles of laser intensity are used to investigate the effect of laser spatial profile on boring , and it is found that the boring effect is stronger when the radial gradient of laser intensity is bigger. Odd and even harmonics are found in reflected waves

  14. Method Cement Post-grouting to Increase the Load Capacity for Bored Pile

    OpenAIRE

    Loc Nguyen; Lei Nie; Min Zhang

    2013-01-01

    Drilled shafts foundations are used as an indispensable solution for long span bridges in Vietnam. In order to increase the bearing capacity, aside from the increasing of the pile length and diameter, an interested way now is treatment of pile bases after concrete placement. This study is aimed at investigating the defect at the bottom of the bored pile from the sonic test. The injection of hight pressure of cement grout to the shaft and tip of the defected bored pile was conducted to increas...

  15. Distribution and biomass estimation of shell-boring algae in the intertidal area at Goa India

    Digital Repository Service at National Institute of Oceanography (India)

    Raghukumar, C.; Sharma, S.; Lande, V.

    The distribution and frequency of shell-boring green and blue-green algae in the intertidal at Goa, India were studied. The green alga Gomontia sp. and the blue green algae Hyella caespitosa Bornet et Flahault, H. gigas Lucas et Golubic...

  16. Eddy current effects on a clinical 7T-68 cm bore scanner

    OpenAIRE

    Kickler, Nils; van der Zwaag, Wietske; Mekle, Ralf; Kober, Tobias; Marques, Jose P.; Krueger, Gunnar; Gruetter, Rolf

    2010-01-01

    Eddy currents induced by switching of magnetic field gradients can lead to distortions in short echo-time spectroscopy or diffusion weighted imaging. In small bore magnets, such as human head-only systems, minimization of eddy current effects is more demanding because of the proximity of the gradient coil to conducting structures.

  17. Construction of a cylindrical brine test room using a tunnel boring machine

    International Nuclear Information System (INIS)

    This paper discusses the construction of a horizontal cylindrical brine test room at the Waste Isolation Pilot Plant (WIPP). The room was constructed in the bedded salt formation at a depth of 655 meters with a tunnel boring machine. The machine leasing, technical and operational management, parameters involved, and successful completion of this effort are included. 3 figs

  18. Beam heat load measurements in the cold bore superconductive undulator in ANKA

    CERN Document Server

    Casalbuoni, S; Hagelstein, M; Zimmermann, F; Rossmanith, Robert; Kostka, Barbara; Mashkina, Elena; Steffens, Erhard; Bernhard, Axel; Wollmann, Daniel; Baumbach, Tilo

    2007-01-01

    Measurements of the beam-induced heat load in the ANKA cold-bore superconductive undulator are summarized. The strength of the two dominating effects, resistive wall heating and heating by electron bombardment, depends on the beam parameters and the gap width.

  19. Technical Diagnostics of Tank Cannon Smooth Barrel Bore and Ramming Device

    Directory of Open Access Journals (Sweden)

    Jiri Balla

    2015-09-01

    Full Text Available The technical diagnostics of 125 mm tank cannon 2A46 smooth barrel and ramming devices are discussed respectively. Focuses on barrel diagnostics and suggests new procedures based on reconstructed BG20 Gun Barrel Bore Gauge System, measuring internal diameter of the barrel bore. The new system measures throughout the whole barrel bore the inner diameter not only at the beginning of barrel bore as it was usually measured before. Different nature of barrel wear was revealed between barrels firing sub-calibre and high explosive projectiles. A method for ramming device diagnostics is presented. An accurate method was proposed, determining projectile extraction force from barrel, as one of the main ramming device parameters for weapons that are used in all areas of armed forces. Results are based on experimental methods assessing the extraction forces from barrel after projectile loading. These tests were performed as a series of tests with consequent technical diagnostics according to the new Czech Defence Standards (derived from NATO standards. The results are presented as the new methodologies for diagnostics of 125 mm barrel 2A46 and ramming devices of tank T-72 for use by technical logistic units in the Czech Republic Armed Forces.

  20. Tunnelling in Soft Soil: Tunnel Boring Machine Operation and Soil Response

    NARCIS (Netherlands)

    Festa, D.; Broere, W.; Bosch, J.W.

    2013-01-01

    Constructing tunnels in soft soil with the use of Tunnel Boring Machines may induce settlements including soil movements ahead of the face, soil relaxation into the tail void, possible heave due to grouting, long lasting consolidation processes, and potentially several other mechanisms. A considerab

  1. Wood-Boring Bivalves (Mollusca: Teredinidae, Pholadidae) of Pacific coast of Colombia

    International Nuclear Information System (INIS)

    Twelve species of wood-boring bivalves, ten of the family Teredinidae and two of family Pholadidae were collected in mangroves at 6 locations of the Pacific coast of Colombia. This paper presents a brief description of these species, including size, ecological notes and geographical distribution.

  2. Stakeout electronic total station construction layout boring of the experience and precision

    International Nuclear Information System (INIS)

    Electronic total station can simultaneously measure angle and distance, together with the appropriate calculation methods and operating skills, able to efficiently complete the survey work, this paper based on practical experience, theoretical analysis, based on total station introduced in setting out a few boring in the skills and the measurement of total station in the construction layout for accuracy. (authors)

  3. Discrete-time modeling of woodwind instrument bores using wave variables

    Science.gov (United States)

    van Walstijn, Maarten; Campbell, Murray

    2003-01-01

    A method for simulation of acoustical bores, useful in the context of sound synthesis by physical modeling of woodwind instruments, is presented. As with previously developed methods, such as digital waveguide modeling (DWM) [Smith, Comput. Music J. 16, 74-91 (1992)] and the multi convolution algorithm (MCA) [Martínez et al., J. Acoust. Soc. Am. 84, 1620-1627 (1988)], the approach is based on a one-dimensional model of wave propagation in the bore. Both the DWM method and the MCA explicitly compute the transmission and reflection of wave variables that represent actual traveling pressure waves. The method presented in this report, the wave digital modeling (WDM) method, avoids the typical limitations associated with these methods by using a more general definition of the wave variables. An efficient and spatially modular discrete-time model is constructed from the digital representations of elemental bore units such as cylindrical sections, conical sections, and toneholes. Frequency-dependent phenomena, such as boundary losses, are approximated with digital filters. The stability of a simulation of a complete acoustic bore is investigated empirically. Results of the simulation of a full clarinet show that a very good concordance with classic transmission-line theory is obtained.

  4. Discrete-time modeling of woodwind instrument bores using wave variables.

    Science.gov (United States)

    van Walstijn, Maarten; Campbell, Murray

    2003-01-01

    A method for simulation of acoustical bores, useful in the context of sound synthesis by physical modeling of woodwind instruments, is presented. As with previously developed methods, such as digital waveguide modeling (DWM) [Smith, Comput. Music J. 16, 74-91 (1992)] and the multi convolution algorithm (MCA) [Martinez et al., J. Acoust. Soc. Am. 84, 1620-1627 (1988)], the approach is based on a one-dimensional model of wave propagation in the bore. Both the DWM method and the MCA explicitly compute the transmission and reflection of wave variables that represent actual traveling pressure waves. The method presented in this report, the wave digital modeling (WDM) method, avoids the typical limitations associated with these methods by using a more general definition of the wave variables. An efficient and spatially modular discrete-time model is constructed from the digital representations of elemental bore units such as cylindrical sections, conical sections, and toneholes. Frequency-dependent phenomena, such as boundary losses, are approximated with digital filters. The stability of a simulation of a complete acoustic bore is investigated empirically. Results of the simulation of a full clarinet show that a very good concordance with classic transmission-line theory is obtained. PMID:12558293

  5. Monitoring pilot projects on bored tunnelling: the Second Heinenoord Tunnel and the Botlek Rail Tunnel

    NARCIS (Netherlands)

    Bakker, K.J.; De Boer, F.; Admiraal, J.B.M.; Van Jaarsveld, E.P.

    1999-01-01

    Two pilot projects for bored tunnelling in soft soil have been undertaken in the Netherlands. The monitoring was commissioned under the authority of the Centre for Underground Construction (COB). A description of the research related to the Second Heinenoord Tunnel and the Botlek Rail Tunnel will be

  6. ICHNOTAXONOMY AND ETHOLOGY OF BORINGS IN SHALLOW-MARINE BENTHIC FORAMINIFERS FROM THE MAASTRICHTIAN AND EOCENEOF NORTHWESTERN AND SOUTHWESTERN TURKEY

    Directory of Open Access Journals (Sweden)

    JAN KRESTEN NIELSEN

    2004-07-01

    Full Text Available Larger benthic foraminiferal tests from the Maastrichtian and Eocene of western Turkey contain a large variety of borings. Two ichnospecies are defined. Maeandropolydora osmaneliensis isp. nov. in tests of Orbitoides is distinguished by a tube, winding sinuously in an irregular manner. This boring was formed by a foraging parasite or scavenger, where the tracemaker specifically exploited certain parts of its substrate. Trypanites helicus isp. nov. in tests of Nummulites is characterized by its tube coiled into a spiral. The boring is interpreted as a dwelling trace. As the boring may be considered to have both idiomorphic and stenomorphic features, it represents an ethological and taxonomic dilemma. To avoid inherent subjectivity within taxonomic classifications, we suggest the exclusion of ethological interpretations from diagnoses. The occurrence of borings may affect the preservational potential of the foraminiferal tests, and thus on the outcome of palaeoenvironmental analyses.

  7. Evaluation Of Reservoir Rock And Well Bore Cement Alteration With Supercritical CO2

    International Nuclear Information System (INIS)

    An evaluation of the alteration of reservoir rock and well bore cement at their interface, under supercritical CO2 (SCCO2), was conducted at the laboratory-scale using simulated brine solutions at down-hole conditions. These studies were intended to identify potential leakage pathways for injected CO2 due to degradation of the well bore. Two distinct test series were conducted on core samples of the Mt. Simon sandstone from the Illinois Basin, IL, and the Grand Ronde basalt from the Pasco Basin, WA. LaFarge Class H well bore cement was used for both series. Reservoir rock/cement cores were immersed within a CO2-saturated brine for up to 2000 hours at 35 degrees C and 100 atm CO2. Results suggest that the impact of SCCO2 injection is reservoir-specific, being highly dependent on the reservoir brine and rock type. Brine pH can be significantly altered by CO2 injection, which in turn can dramatically impact the dissolution characteristics of the reservoir rock. Finally, well bore cement alteration was identified, particularly for fresh cast cement allowed to cure at SCCO2 conditions. However, this alteration was generally limited to an outer rind of carbonate and Ca-depleted cement which appeared to protect the majority of the cement core from further attack. These studies indicate that at the cement-rock interface, the annular space may be filled by carbonate which could act as an effective barrier against further CO2 migration along the well bore.

  8. Tests of a prototype large-bore, low-power 2↔4 RF transition unit

    International Nuclear Information System (INIS)

    The Michigan ultra-cold polarized hydrogen jet requires a 2↔4 RF transition unit with a large bore, low power input for cryogenic operation, and a static magnetic field parallel to the atomic beam. The prototype unit has a cylindrical RF cavity with clear bore of 7 cm, loaded with a dielectric ring. Transition efficiency has been measured using a maser run in transient mode, by observing free induction decay. In tests on a room-temperature polarized beam, for static fields of under 100 G, we have measured efficiencies of 95% with less than 100 mW of RF power. This work is supported by a grant from the U.S. Department of Energy

  9. In-Bore MR-Guided Biopsy Systems and Utility of PI-RADS.

    Science.gov (United States)

    Fütterer, Jurgen J; Moche, Michael; Busse, Harald; Yakar, Derya

    2016-06-01

    A diagnostic dilemma exists in cases wherein a patient with clinical suspicion for prostate cancer has a negative transrectal ultrasound-guided biopsy session. Although transrectal ultrasound-guided biopsy is the standard of care, a paradigm shift is being observed. In biopsy-naive patients and patients with at least 1 negative biopsy session, multiparametric magnetic resonance imaging (MRI) is being utilized for tumor detection and subsequent targeting. Several commercial devices are now available for targeted prostate biopsy ranging from transrectal ultrasound-MR fusion biopsy to in bore MR-guided biopsy. In this review, we will give an update on the current status of in-bore MRI-guided biopsy systems and discuss value of prostate imaging-reporting and data system (PIRADS). PMID:27187168

  10. The occurrence of gas in preliminary shaft bores Go 5001 and Go 5002

    International Nuclear Information System (INIS)

    The gases/condensates occuring in the Gorleben salt deposits were formed from organic substances. (Reference oil structure of Werra anhydrite A1, Zechstein chalk (Ca 1) and the main dolomite foetid shale (Ca 2)). During the variegated rise of the salt deposit, according to previous exploration, the condensates reached the orange salt and have been stored there since. They are stored limited to certain localities, if one takes the gas and condensate-free orange salt deposits found in deep bores and the preliminary shaft bore Go 5001 into account. Because of the core formation, the condensate can only be bound in hairline cracks and strata boundaries and not in the crystal grid. (orig./HP)

  11. Non-intrusive measurement of inner bore temperature of small arms using integrated ultrasonic transducers

    Science.gov (United States)

    Lévesque, D.; Pimentel, R.; Lord, M.; Beauchesne, A.; Kruger, S. E.; Stowe, R.; Wong, F.; Monchalin, J.-P.

    2016-02-01

    Management of thermal input to a small arms weapons system is a significant design and operational constraint. A collaborative project was initiated with the objective to measure non-intrusively the inner bore barrel temperature of a small arm during actual firing. The approach uses integrated ultrasonic transducers (IUTs) and the velocity temperature dependence of the longitudinal wave propagating through thickness. IUT is successfully implemented on a small arm at 3 locations and results from several firing tests are presented. The small but systematic increase in ultrasonic time delay of less than 1 ns after each firing shot is reliably measured, in agreement with a simple 1D model of heat conduction, and measured temperature rises are consistent with the thicknesses at the different locations. The evaluation of the peak inner bore temperatures using IUT and their validation using eroding surface thermocouples at the same locations in the barrel are discussed.

  12. Experimental Study on Post Grouting Bearing Capacity of Large Diameter Bored Piles

    Directory of Open Access Journals (Sweden)

    Wang Duanduan

    2015-01-01

    Full Text Available Post grouting can improve the inherent defects such as the formation of the mud cake at pile side and the sediment at pile end in the process of bored pile construction. Thus post grouting has been widely used in Engineering. The purpose of this paper is to research the influences of post grouting to pile bearing capacity more systematically and intuitively. Combined with the static load test of four test piles in Weihe River Bridge test area of new airport highway in Xi’an, the bearing capacity and settlement of routine piles and post grouting piles are comparatively analyzed. The test results show that under the same geological condition, post grouting can improve the properties of pile tip and pile shaft soil of bored piles significantly, enhance the ultimate resistance, improve the ultimate bearing capacity and reduce the pile tip settlement. Then post grouting can aim to optimize pile foundation.

  13. On the derivation of a creep law from isothermal bore hole convergence

    International Nuclear Information System (INIS)

    Some analytical as well as numerical aspects relevant to the creep behaviour of cavity-like structures in salt domes are presented. Two finite element models are presented for the modelling of the bore hole configuration, both dealing with the problem of a correct choice of the amount of salts which must be taken into account. A numerical procedure is suggested to derive a material creep law from measured bore hole convergence. This procedure is applied on convergence measurement in the ASSE mine (Germany) leading to a secondary creep law (depsilon/dt)sup(c)=8.8x10-11sigmasup(5.5) (sigma in MPa, (depsilon/dt)sup(c) in days-1) which describes the transient convergence behaviour correctly. Some questions concerning the uniqueness of the derived creep law are discussed

  14. A pulse forming network design for blocked-bore plasma armature experiments

    Science.gov (United States)

    Carey, William J.; Barrett, B. D.; Nunnally, W. C.; Dillon, W. E.; Eubank, Eric L.

    1993-01-01

    The railgun diagnostic program now in progress requires a ramping current waveform with a continuously positive di/dt until peak current is delivered approximately 1 millisecond after circuit closure. This pulse forming network (PFN) is designed to power blocked-bore plasma armature studies being conducted on a section of the THUNDERBOLT prototype, SUVAC. The PFN design has an operating voltage range from 300 to 1400 volts and is capable of delivering peak currents up to 200 kA.

  15. High performance, 70 kV third-harmonic smooth-bore gyroklystron amplifier

    Energy Technology Data Exchange (ETDEWEB)

    McNally, J.D.; McDermott, D.B.; Wang, Q.S.; Hartemann, F.V.; Luhmann, N.C. Jr. (Univ. of California, Davis, CA (United States). Dept. of Applied Science)

    1994-10-01

    The design of a 95 GHz third-harmonic smooth-bore gyroklystron amplifier utilizing an axis-encircling electron beam is presented. Using a self-consistent simulation code, a parameter search was performed to determine the optimum device characteristics for a gyroklystron operating in the circular TE[sub 31] mode. For a 70 kV, 5 A electron beam with v[sub [perpendicular

  16. We are, of course, bored with course boards: an online alternative to formal course meetings

    OpenAIRE

    Jon Dron; JUdith Masthoff

    2004-01-01

    This paper discusses the implementation of an online course board, an attempt to conduct formal course meetings using simple web-based threaded bulletin board technologies. This technique seeks to address some of the problems of conventional meetings where individuals cam dominate proceedings, most attendees waste much of the time being bored and there is a heavy investment of time and money for little direct benefit. Although it provides solutions to some of the problems of traditional fac...

  17. Studies on the reduction of nitrogen oxides emission in a large-bore diesel engine

    OpenAIRE

    Imperato, Matteo

    2016-01-01

    This experimental research studied different technologies for reducing nitrogen oxides (NOx) in the exhaust gases, running with a large-bore medium-speed diesel research engine. NOx mainly form during combustion in local high temperature zones. This study considered primary methods, avoiding high combustion temperatures. In particular, the Miller cycle, which is a proven concept for NOx reduction, was deeply studied. This technology was applied by closing early the intake valves to create a f...

  18. Speciation analysis by small-bore HPLC coupled to ICP-MS

    OpenAIRE

    Grotti, Marco; Terol Pardo, Amanda; Todolí Torró, José Luis

    2014-01-01

    Although high-performance liquid chromatography with inductively-coupled mass spectrometry (HPLC-ICP-MS) has established itself as the analytical technique of choice for elemental speciation analysis, there are remaining limitations, mainly concerning post-column dispersion effects and degradation of the ICP stability and ionization efficiency due to organic or saline mobile phases. The application of small-bore columns in conjunction with low dead-volume interfaces has proved very useful for...

  19. Boring sponges, an increasing threat for coral reefs affected by bleaching events

    OpenAIRE

    Carballo, José L; Bautista, Eric; Nava, Héctor; Cruz-Barraza, José A; Chávez, Jesus A

    2013-01-01

    Coral bleaching is a stress response of corals induced by a variety of factors, but these events have become more frequent and intense in response to recent climate-change-related temperature anomalies. We tested the hypothesis that coral reefs affected by bleaching events are currently heavily infested by boring sponges, which are playing a significant role in the destruction of their physical structure. Seventeen reefs that cover the entire distributional range of corals along the Mexican P...

  20. Electropolishing the bore of metal capillary tubes: A technique for adjusting the critical flow.

    Science.gov (United States)

    Stoffels, J J; Ells, D R

    1979-12-01

    A technique has been developed for electropolishing the bore of metal capillary tubes. Although developed specifically for stainless-steel tubes, the technique should be directly applicable to other metals. Tubes with inside diameter as small as 0.20 mm and 110 mm long have been successfully electropolished. The electropolishing technique can be used to increase the critical flow of a capillary tube in a controllable way. PMID:18699437

  1. Tunnelling in Soft Soil: Tunnel Boring Machine Operation and Soil Response

    OpenAIRE

    Festa, D.; Broere, W.; Bosch, J.W.

    2013-01-01

    Constructing tunnels in soft soil with the use of Tunnel Boring Machines may induce settlements including soil movements ahead of the face, soil relaxation into the tail void, possible heave due to grouting, long lasting consolidation processes, and potentially several other mechanisms. A considerable amount of the total soil displacements seems correlated with the passage of the TBM-shield. Even so, the TBM-induced soil displacements have so far only been coarsely correlated to the total set...

  2. Fine-bore cannulas for peripheral intravenous nutrition: polyurethane or silicone?

    OpenAIRE

    Plusa, S. M.; Horsman, R.; Kendall-Smith, S.; Webster, N; Primrose, J N

    1998-01-01

    The peripheral intravenous route is being used more frequently for the administration of short- to medium-term parenteral nutritional support. Dedicated fine bore cannulas have significantly reduced the incidence of thrombophlebitis. Currently available cannulas are made of polyurethane or silicone. We present our experience with a 23G silicone cannula and a 22G polyurethane alternative. Fifty-four silicone cannulas were used with a median survival of only 3 days, compared with 7 days for 90 ...

  3. Development of Managing Program for Small Bore Piping Socket Weld on the Secondary System of NPP

    International Nuclear Information System (INIS)

    Kori unit 3 had stopped operation due to leakage at steam generator drain line socket weld on June 6th, 2008. The cause of socket weld damage was known as welding defect and fatigue by vibration under normal operation. With above reason, the government has been required developing management program for small bore piping socket weld. Therefore, we have developed the socket weld management program to secure reliability and soundness of socket welds which are located at all domestic NPPs

  4. Submarine canyons as the preferred habitat for wood-boring species of Xylophaga (Mollusca, Bivalvia)

    Science.gov (United States)

    Romano, C.; Voight, J. R.; Company, J. B.; Plyuscheva, M.; Martin, D.

    2013-11-01

    Submarine canyons are often viewed as natural “debris concentrators” on the seafloor. Organic substrates may be more abundant inside than outside canyon walls. To determine the effects of the presence these substrates in the Blanes submarine canyon (NW Mediterranean) and its adjacent western open slope, we deployed wood to study colonizing organisms. Three replicate pine and oak cubes (i.e. most common trees inland) were moored at 900, 1200, 1500 and 1800 m depth and collected after 3, 9 and 12 months. Wood from inside the canyon was significantly more heavily colonized by the five morphotypes of wood-boring bivalves than was wood on the adjacent open slope. Xylophaga sp. A dominated all wood types and locations, with peak abundance at 900 and 1200 m depth. Its growth rate was highest (0.070 mm d-1) during the first three months and was faster (or it recruits earlier) in pine than in oak. Size distribution showed that several recruitment events may have occurred from summer to winter. Xylophaga sp. B, appeared first after 9 months and clearly preferred pine over oak. As the immersion time was the same, this strongly supported a specific association between recruiters and type of substrate. Three morphotypes, pooled as Xylophaga spp. C, were rare and seemed to colonize preferentially oak inside the canyon and pine in the adjacent open slope. Individuals of Xylophaga were more abundant inside the canyon than in nearby off-canyon locations. Blanes Canyon may serve as a long-term concentrator of land-derived vegetal fragments and as a consequence sustain more animals. Are the species richness and abundance of wood-boring bivalves higher inside the canyon than on the adjacent open slope? Do the composition and density of the wood-boring bivalves change with deployment time and depth, as well as on the type of the sunken wood? What is the growth rate of the dominant wood-boring species?

  5. The evolution of an internal bore at the Malin shelf break

    Directory of Open Access Journals (Sweden)

    J. Small

    Full Text Available Observations of internal waves were made at the Malin shelf edge during SESAME (Shelf Edge Studies Acoustic Measurement Experiment, a part of the NERC LOIS-SES experiment, in August-September 1996. These measurements provide a high resolution dataset demonstrating internal wave generation and propagation. This note presents observations of the evolution of an internal bore. The process is shown clearly in a sequence of thermistor chain tows across the shelf break covering a complete tidal cycle, as the double-sided bore transforms into a group of undulations and eventually into more distinct solitary waveforms. Current structures associated with the bore and waves were also observed by ship-mounted ADCP. Analysis of the waveforms in terms of the linear modes and empirical orthogonal functions (EOFs indicate the dominance of the first mode, which is typical of a shallow water seasonal thermocline environment. Determination of the phase speed of the waves from the consecutive ship surveys enabled the Doppler shift in the towed data to be removed, allowing analysis of the real length scales of the waves. The bore evolution has been modelled using a first order non-linear KdV model for the first mode, initialised with the waveform in the first survey. Comparison of the model and the observations show close agreement in the amplitudes, length scales, phase speeds and separations of the leading internal waves as they evolve. Finally, analysis of the observed internal wave shapes indicates that, within the uncertainties of measurement, the wave-lengths lie between those predicted by first and second order soliton theory.

    Key words. Oceanography: general (continental shelf processes; ocean prediction. Oceanography: physical (internal and inertial waves

  6. Eaten up by boredom: consuming food to escape awareness of the bored self

    OpenAIRE

    Moynihan, Andrew B.; van Tilburg, Wijnand A.P.; Igou, Eric R.; Wisman, Arnaud; Donnelly, Alan E.; Mulcaire, Jessie B.

    2015-01-01

    Research indicates that being bored affectively marks an appraised lack of meaning in the present situation and in life. We propose that state boredom increases eating in an attempt to distract from this experience, especially among people high in objective self-awareness. Three studies were conducted to investigate boredom's effects on eating, both naturally occurring in a diary study and manipulated in two experiments. In Study 1, a week-long diary study showed that state boredom positively...

  7. The Time and Cost Prediction of Tunnel Boring Machine in Tunnelling

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Making use of microsoft visual studio. net platform, the assistant decision-making system of tunnel boring machine in tunnelling has been built to predict the time and cost. Computation methods of the performance parameters have been discussed. New time and cost prediction models have been depicted. The multivariate linear regression has been used to make the parameters more precise, which are the key factor to affect the prediction near to the reality.

  8. Influence of Cylinder Bore Volume on Pressure Pulsations in a Hermetic Reciprocating Compressor

    OpenAIRE

    Novak, Keith Adam

    2014-01-01

    Suction pressure pulsations created when the suction valve opens are caused by unsteady mass flow through the valve exciting acoustic resonances in the suction plenum. These pressure pulsations influence valve dynamics, compressor performance and compressor noise. This paper will show the importance of including the cylinder bore volume in the flow path analysis in order to accurately calculate pressure pulsations. Pressure pulsations will be calculated using Finite Element Method (FEM) calcu...

  9. Deposition of high-level radioactive waste products in bore-holes with buffer substance

    International Nuclear Information System (INIS)

    The present investigation comprised a compilation of available literature data concerning the possible use of clayey masses as buffer substances in bore-holes (in rock) with canisters containing radioactive waste products. The aim was to find a suitable composition of the buffer mass and to recommend a suitable storing technique. The criteria concerning the function of the buffer substance were: Sufficient mechanical supporting power, suitable mechanical properties, prevention of free circulation of ground water, ion-adsorption ability, sufficiently good heat conduction properties. These criteria suggest that a buffer substance containing Na-montmorillonite would be suitable. Literature studies and own experience show that montmorillonite is permanently stable at 100 degrees C temperature and 5 MPa pressure when pH is within the range of 6.5-10 while quartz is stable at pH <9. The authors conclude that the suggested principle of storing the canisters in sealed bore-holes filled with a 10 percent bentonite/90 percent quartz (silt, sand) mass is suitable provided that the tunnel system, from which the holes are bored, is sealed with a dense buffer mass consisting of quartz (silt, sand) and 20-50 percent bentonite powder. (author)

  10. Tri-bore PVDF hollow fibers with a super-hydrophobic coating for membrane distillation

    KAUST Repository

    Lu, Kang-Jia

    2016-04-26

    Membranes with good mechanical strength, high vapor flux and outstanding anti-wetting properties are essential for membrane distillation (MD) applications. In this work, porous polyvinylidene fluoride (PVDF) tri-bore hollow fiber membranes with super-hydrophobicity are developed to achieve these desired properties. The tri-bore hollow fiber offers better mechanical strength than the conventional single-bore fiber. To improve its anti-wetting properties, Teflon® AF 2400 is coated on the membrane surface. The effects of coating on membrane morphology, performance and anti-wetting properties have been thoroughly investigated. With an optimal coating condition (0.025 wt% of Teflon® AF 2400, 30 s), a super-hydrophobic surface with a contact angle of 151o is achieved. The resultant membrane shows an increase of 109% in liquid entry pressure (LEP) with a slight sacrifice of 21% in flux. Long term direct contact MD tests have confirmed that the Teflon® AF 2400 coated membrane has enhanced stability with an average flux of 21 kg m-2 h-1 and rejection of 99.99% at 60 °° C for desalination application.

  11. Modeling of propellant flow and explosively-driven valve for the Large-Bore Powder Gun

    Science.gov (United States)

    Lam, Kin

    2013-06-01

    The Large-Bore Powder Gun, with a 3.5-inch bore, is being developed to provide dynamic experiments on physics samples at the Nevada Test Site with impact velocities exceeding 2 km/s. A confinement system is required to seal the target chamber from the gun system to keep it free of hazardous materials from the impact event. A key component of the confinement system is an explosively driven valve (EDV), which uses a small amount of explosive (PBX 9501) to drive an aluminum piston perpendicular to the barrel axis into a tapered hole. The objective of this study is to evaluate the efficacy of the EDV design via computational simulations using models validated with prototype experiments. We first established the gun performance characteristics using an interior ballistics code. Then an energy source model capable of generating the kinematics (i.e., pressure, velocity and displacement profiles) as predicted by the interior ballistic code is used in the hydrodynamics code CTH to calculate the M14 propellant gas expansion as the projectile travels down the gun barrel with the goal of obtaining the lateral (stagnation) pressure load on the EDV piston as it is inserted into the bore. A model of the EDV operation validated against stand-alone experiments is also developed. The gas flow and EDV models are combined to simulate integrated tests as well as the operating conditions specified for qualification. Results from these simulations and those involving design modifications to improve the confinement will be presented.

  12. Design of a machine to bore and line a long horizontal hole in tuff: Nevada Nuclear Waste Storage Investigations Project

    International Nuclear Information System (INIS)

    This report describes an engineering design for equipment capable of simultaneously drilling and lining deep horizontal bore holes. The ultimate use of the equipment is to bore up to 600 ft long, 3 ft diameter emplacement holes for a nuclear waste repository. The specific system designed is referred to as a Development Prototype Boring Machine (DPBM) which will be used to demonstrate the drilling/lining capability in field development tests. The system utilizes as in-hole electric drive and a vacuum chip removal and handling system. The drilling unit is capable of active directional control and uses laser-type alignment equipment. The system combines the features of a small steerable tunnel boring machine, combined with a horizontally-oriented raise drill, thereby utilizing current technology. All elements of the system are compact and mobile as required for a shaft entry, underground mining environment. 3 refs., 35 figs., 1 tab

  13. Assessment of water quality index of bore well water samples from some selected locations of South Gujarat, India.

    Science.gov (United States)

    Tripathi, S; Patel, H M; Srivastava, P K; Bafna, A M

    2013-10-01

    The present study calculates the water quality index (WQI) of some selected sites from South Gujarat (India) and assesses the impact of industries, agriculture and human activities. Chemical parameters were monitored for the calculation of WQI of some selected bore well samples. The results revealed that the WQI of the some bore well samples exceeded acceptable levels due to the dumping of wastes from municipal, industrial and domestic sources and agricultural runoff as well. Inverse Distance Weighting (IDW) was implemented for interpolation of each water quality parameter (pH, EC, alkalinity, total hardness, chloride, nitrate and sulphate) for the entire sampled area. The bore water is unsuitable for drinking and if the present state of affairs continues for long, it may soon become an ecologically dead bore. PMID:25906591

  14. STABILITY AND VIBRATION OF DRILL STRINGS WITH INTERNAL FLOWS OF LIQUIDS IN THE CHANNELS OF HORIZONTAL BORE-HOLES

    OpenAIRE

    Andrusenko E.N.; Glazunov S.N.

    2015-01-01

    In connection with elaboration of new technologies of hydrocarbons extraction from shales, in the oil and gas industry, the great attention is payed to the problems of drilling inclined and horizontal bore-holes. The peculiarities of these bore-hole drivage consist in essential influence of friction and contact forces on proceeding of drilling processes. In this paper, the problem about bifurcational buckling and small bending vibration of a rotating drill string lying in the channel of a hor...

  15. Small-bore chest tubes seem to perform better than larger tubes in treatment of spontaneous pneumothorax

    DEFF Research Database (Denmark)

    Iepsen, Ulrik Winning; Ringbæk, Thomas

    2013-01-01

    The aim of this study was to compare the efficacy and complications of surgical (large-bore) chest tube drainage with smaller and less invasive chest tubes in the treatment of non-traumatic pneumothorax (PT). ......The aim of this study was to compare the efficacy and complications of surgical (large-bore) chest tube drainage with smaller and less invasive chest tubes in the treatment of non-traumatic pneumothorax (PT). ...

  16. Automatic orbital TIG-welding of small bore austenitic stainless steel tubes for nuclear fuel reprocessing plant

    International Nuclear Information System (INIS)

    Traditionally, manual welding techniques have been employed for shop and site fabrication of small bore austenitic stainless steel tubes in the nuclear fuel reprocessing plant of British Nuclear Fuels Limited (BNFL). This Paper describes an evaluation programme carried out to develop welding procedures for both 18Cr-13Ni-1Nb and 18Cr-10Ni low carbon stainless steel small bore tubing, the type of equipment used, and the modifications required for application to shop and site environments. (author)

  17. Estimation of Tsunami Bore Forces on a Coastal Bridge Using an Extreme Learning Machine

    Directory of Open Access Journals (Sweden)

    Iman Mazinani

    2016-04-01

    Full Text Available This paper proposes a procedure to estimate tsunami wave forces on coastal bridges through a novel method based on Extreme Learning Machine (ELM and laboratory experiments. This research included three water depths, ten wave heights, and four bridge models with a variety of girders providing a total of 120 cases. The research was designed and adapted to estimate tsunami bore forces including horizontal force, vertical uplift and overturning moment on a coastal bridge. The experiments were carried out on 1:40 scaled concrete bridge models in a wave flume with dimensions of 24 m × 1.5 m × 2 m. Two six-axis load cells and four pressure sensors were installed to the base plate to measure forces. In the numerical procedure, estimation and prediction results of the ELM model were compared with Genetic Programming (GP and Artificial Neural Networks (ANNs models. The experimental results showed an improvement in predictive accuracy, and capability of generalization could be achieved by the ELM approach in comparison with GP and ANN. Moreover, results indicated that the ELM models developed could be used with confidence for further work on formulating novel model predictive strategy for tsunami bore forces on a coastal bridge. The experimental results indicated that the new algorithm could produce good generalization performance in most cases and could learn thousands of times faster than conventional popular learning algorithms. Therefore, it can be conclusively obtained that utilization of ELM is certainly developing as an alternative approach to estimate the tsunami bore forces on a coastal bridge.

  18. Bore formation, evolution and disintegration into solitons in shallow inhomogeneous channels

    Directory of Open Access Journals (Sweden)

    J.-G. Caputo

    2003-01-01

    Full Text Available The propagation of nonlinear surface waves in channels of smoothly variable in space cross section is studied theoretically and by means of numerical computations. The mathematical model describing wave evolution is based on the generalized Korteweg-de Vries equation with additional terms due to spatial inhomogeneity and energy dissipation. Specifically we consider channels of variable depth and width. The breaking of Riemann waves and the disintegration of hydraulic jumps into trains of solitons have been examined. The results obtained can be useful in particular for the understanding some peculiarities of bore (mascaret formation, viscous evolution and disintegration into solitons in inhomogeneous channels or rivers.

  19. Measurements of an ion beam diameter extracted into air through a large-bore metal capillary

    Energy Technology Data Exchange (ETDEWEB)

    Hirano, Y.; Umigishi, M. [Graduate School of Humanities and Sciences, Nara Women’s University, Nara 630-8506 (Japan); Ishii, K.; Ogawa, H. [Department of Physics, Nara Women’s University, Nara 630-8506 (Japan)

    2015-07-01

    To extract an ion beam into air, the technique using a single macro-capillary has been paid attention. We have expanded the bore of the metal capillary up to 500 μm∅ inlet diameter to increase the beam intensity and have measured the intensity distributions of the extracted 3 MeV proton beam. Furthermore, we have tilted the capillary angle and measured the intensity distributions of the ion beam. In this article, we will present the experimental results together with the simulation which takes the tilt angles of the capillary into account.

  20. The CERL in-situ probe for boiler ferrule bore mensuration

    International Nuclear Information System (INIS)

    Mensuration of the bores of boiler feed control ferrules in-situ within the AGR boilers can be done using a Central Electricity Research Laboratories-designed probe and ancillary equipment. From these measurements it is possible to determine the loss coefficients of the ferrules with fair accuracy. These loss coefficients may differ from the intended values because of poor quality control during manufacture or because of erosion and oxide deposition in service. This Report describes the construction and operation of the equipment. (author)

  1. Design of HQ -- a High Field Large Bore Nb3Sn Quadrupole Magnet for LARP

    Energy Technology Data Exchange (ETDEWEB)

    Felice, H.; Ambrosio, G.; Anerella, M.; Bossert, R.; Caspi, S.; Cheng, D.; Dietderich, D.; Ferracin, P.; Ghosh, A. K.; Hafalia, R.; Hannaford, C. R.; Kashikhin, V.; Schmalze, J.; Prestemon, S.; Sabbi, G. L.; Wanderer, P.; Zlobin, A. V.

    2008-08-17

    In support of the Large Hadron Collider luminosity upgrade, a large bore (120 mm) Nb{sub 3}Sn quadrupole with 15 T peak coil field is being developed within the framework of the US LHC Accelerator Research Program (LARP). The 2-layer design with a 15 mm wide cable is aimed at pre-stress control, alignment and field quality while exploring the magnet performance limits in terms of gradient, forces and stresses. In addition, HQ will determine the magnetic, mechanical, and thermal margins of Nb{sub 3}Sn technology with respect to the requirements of the luminosity upgrade at the LHC.

  2. Tidal bore and shock wave%涌潮与激波

    Institute of Scientific and Technical Information of China (English)

    林炳尧; 潘存鸿

    2015-01-01

    100 years ago, the mathematical formulations of describingflows in shallow water and air were found to be the same sometimes, and there were quite a few similarities between tidal bore and shock wave. Consequently, research on tidal bore had a great leap forward. Later, differences between the two phenomena were thoroughly analyzed, uplifting the understanding of the tidal bore to a new level. In reviewing the process of tidal bore studies, we come to know that analog can be used as a tool at the initial stage of exploring a newfield or phenomenon; then the study can be pushed forward with the methods used inother disciplines; to a certain extent, comparison should be made timely between the known phenomenon and the new one, focusing on the particularities of the new one. Through seeking common ground and exploring differences, the understanding of a new phenomenon will be more comprehensive and thorough.%100年前,人们发现描述浅水和气体两种流动的方程有相同的形式,涌潮与激波有诸多类似性质,涌潮的研究因此获得很大进步。进一步研究后,逐渐了解两种现象的差别,于是,对两者的认识上升到新的阶段。回顾涌潮研究这段历程,了解到在探索新领域、新现象之初,可以用类比作为工具,借助于其他学科的方法推进对新现象的研究,到一定程度后,应该及时采用与已知现象相比较的方法,着重研究新现象的特殊性。通过“求同探异”,对新现象的认识必将更加全面、深入。

  3. Measurements of an ion beam diameter extracted into air through a large-bore metal capillary

    International Nuclear Information System (INIS)

    To extract an ion beam into air, the technique using a single macro-capillary has been paid attention. We have expanded the bore of the metal capillary up to 500 μm∅ inlet diameter to increase the beam intensity and have measured the intensity distributions of the extracted 3 MeV proton beam. Furthermore, we have tilted the capillary angle and measured the intensity distributions of the ion beam. In this article, we will present the experimental results together with the simulation which takes the tilt angles of the capillary into account

  4. Behavior of a Field-Reversed Configuration Translated into a Large-Bore Confinement Chamber

    Science.gov (United States)

    Sekiguchi, Jun'ichi; Asai, Tomohiko; Takahashi, Tsutomu; Ando, Hirotoshi; Inomoto, Michiaki; Takahashi, Toshiki; Steinhauer, Loren C.

    To demonstrate additional heating and control methods a new field-reversed configuration (FRC) machine called FAT (FRC Amplification via Translation) has begun operations. FAT has a field-reversed theta-pinch (FRTP) plasma source and a large-bore confinement chamber. In the initial experiments on FAT, fast FRC translation and trapping with the translation speeds 70 to 210 km/s has been performed successfully. The typical elongation of the trapped FRC is approximately 3. Disruptive global instability, such as tilt, is not observed.

  5. Wear and corrosion properties of steels used in Tunnel Boring Machines

    OpenAIRE

    Grødal, Christian Kreyberg

    2012-01-01

    In this master thesis experiments were conducted to determine the abrasion-corrosion properties of a steel designed for TBM tunnelling. This was done by three different tests, reciprocal ball-on-plate, rubber wheel and hyperbaric soil abrasion test. The reciprocal tests were done by rubbing steel balls onto rock obtained from a tunnel boring site in the Faroe Islands. The test were performed in dry conditions, in water from the same site as rock and a mixture of the water and a foam designed ...

  6. Performance of 1 m long / 75 mm bore superconducting prototype coils for HERA

    International Nuclear Information System (INIS)

    Two short prototypes of the new HERA superconducting dipole magnets with 75 mm inner bore have been built and tested in a bath cryostat. Both coils have reached the short sample current of the coil after a few training steps. The quench current depends linearly on the temperature between 4.0 and 5.0 K. The field quality of both coils is in general within specifications. There is no current dependence of the higher harmonics except for the well-known hysteresis due to persistent currents. (orig.)

  7. Experimental Study on Post Grouting Bearing Capacity of Large Diameter Bored Piles

    OpenAIRE

    Wang Duanduan; Wang Longfei; Zhang Lipeng

    2015-01-01

    Post grouting can improve the inherent defects such as the formation of the mud cake at pile side and the sediment at pile end in the process of bored pile construction. Thus post grouting has been widely used in Engineering. The purpose of this paper is to research the influences of post grouting to pile bearing capacity more systematically and intuitively. Combined with the static load test of four test piles in Weihe River Bridge test area of new airport highway in Xi’an, the bearing capac...

  8. Analysis of in-situ renewal technology for the backhoe bucket bores

    International Nuclear Information System (INIS)

    The overall aim of this article is to outline the progress of the research on how to develop an economically and scientifically justified backhoe buckets boreholes renewal technology by using mobile on-site technological equipment. Today the new mobile (in-situ) repair technologies are extensively used for the specialized equipment and machinery repairs. This repair technology is deployed directly on the damaged product: repair equipment is installed by using specialized centering devices. The bucket bores central axes are used as a reference base and damaged layer of material is removed mechanically applying turning operation. Subsequently the renewable surface is covered by new material layer by means of regular MIG/MAG welding. The last technological operation is final turning to the nominal diameter. Outlined renewal technology should meet high expectations – this necessitates in-depth and systematic study of pins and bores which are the most repaired objects of shovel bucket excavators. Therefore, research on established accuracy and technical requirements, both for the repaired unit and technological equipment in line with in-situ repair technology specifics, has been done. It was supported by impact analysis of the technological regimes to surface integrity with ambition to provide practical recommendations for the optimal choice of the technological regimes. Key words: in-situ repair technology, surface integrity, technological parameters

  9. Analysis of Nonlinear Discrete Time Active Control System with Boring Chatter

    Directory of Open Access Journals (Sweden)

    Shujing Wu

    2014-03-01

    Full Text Available In this work we study the design and analysis for nonlinear discrete time active control system with boring charter. It is shown that most analysis result for continuous time nonlinear system can be extended to the discrete time case. In previous studies, a method of nonlinear Model Following Control System (MFCS was proposed by Okubo (1985. In this study, the method of nonlinear MFCS will be extended to nonlinear discrete time system with boring charter. Nonlinear systems which are dealt in this study have the property of norm constraints ║ƒ (v (k║&le&alpha+&betaβ║v (k║&gamma, where &alpha&ge0, &beta&ge0, 0&le&gamma&le1. When 0&le&gamma&le1. It is easy to extend the method to discrete time systems. But in the case &gamma = 1 discrete time systems, the proof becomes difficult. In this case, a new criterion is proposed to ensure that internal states are stable. We expect that this method will provide a useful tool in areas related to stability analysis and design for nonlinear discrete time systems as well.

  10. Design of a Large Bore 60-T Pulse Magnet for Sandia National Laboratories

    Energy Technology Data Exchange (ETDEWEB)

    LESCH,B.; LI,L.; PERNAMBUCO-WISE,P.; ROVANG,DEAN C.; SCHNEIDER-MUNTAU,H.J.

    1999-09-23

    The design of a new pulsed magnet system for the generation of intense electron beams is presented. Determined by the required magnetic field profile along the axis, the magnet system consists of two coils (Coil No.1 and No.2) separated by a 32-mm axial gap. Each coil is energized independently. Both coils are internally reinforced with HIM Zylon fiber/epoxy composite. Coil No.1 made with AI-15 Glidcop wire has a bore of 110-mm diameter and is 200-mm long; it is energized by a 1.3-MJ, 13-kV capacitor bank. The magnetic field at the center of this coil is 30 T. Coil No.2 made with CuNb wire has a bore of 45 mm diameter, generates 60 T with a pulse duration of 60 ms, and is powered by a 4.0-MJ, 17.7-kV capacitor bank. We present design criteria, the coupling of the magnets, and the normal and the fault conditions during operation.

  11. Development and testing of an active boring bar for increased chatter immunity

    Energy Technology Data Exchange (ETDEWEB)

    Redmond, J.; Barney, P.

    1997-12-01

    Recent advances in smart materials have renewed interest in the development of improved manufacturing processes featuring sensing, processing, and active control. In particular, vibration suppression in metal cutting has received much attention because of its potential for enhancing part quality while reducing the time and cost of production. Although active tool clamps have been recently demonstrated, they are often accompanied by interfacing issues that limit their applicability to specific machines. Under the auspices of the Laboratory Directed Research and Development program, the project titled {open_quotes}Smart Cutting Tools for Precision Manufacturing{close_quotes} developed an alternative approach to active vibration control in machining. Using the boring process as a vehicle for exploration, a commercially available tool was modified to incorporate PZT stack actuators for active suppression of its bending modes. Since the modified tool requires no specialized mounting hardware, it can be readily mounted on many machines. Cutting tests conducted on a horizontal lathe fitted with a hardened steel workpiece verify that the actively damped boring bar yields significant vibration reduction and improved surface finishes as compared to an unmodified tool.

  12. Detailed design of the large-bore 8 T superconducting magnet for the NAFASSY test facility

    International Nuclear Information System (INIS)

    The ‘NAFASSY’ (NAtional FAcility for Superconducting SYstems) facility is designed to test wound conductor samples under high-field conditions at variable temperatures. Due to its unique features, it is reasonable to assume that in the near future NAFASSY will have a preeminent role at the international level in the qualification of long coiled cables in operative conditions. The magnetic system consists of a large warm bore background solenoid, made up of three series-connected grading sections obtained by winding three different Nb3Sn Cable-in-Conduit Conductors. Thanks to the financial support of the Italian Ministry for University and Research the low-field coil is currently under production. The design has been properly modified to allow the system to operate also as a stand-alone facility, with an inner bore diameter of 1144 mm. This magnet is able to provide about 7 T on its axis and about 8 T close to the insert inner radius, giving the possibility of performing a test relevant for large-sized NbTi or medium-field Nb3Sn conductors. The detailed design of the 8 T magnet, including the electro-magnetic, structural and thermo-hydraulic analysis, is here reported, as well as the production status. (paper)

  13. Ultrabroadband Relay Imaged GRENOUILLE as a Time-Resolved Diagnostic for Relativistic Hole Boring

    Science.gov (United States)

    Wagner, Craig; Bernstein, Aaron; Dyer, Gilliss; Ditmire, Todd

    2015-11-01

    In a highly intense laser-solid interaction, the surface of the resultant plasma is pushed into the interior of the target at a significant fraction of the speed of light as a result of the intense radiation pressure from the focused laser beam. This is known as hole boring. During the hole boring process laser interactions with electrons at the receding target surface generate light at frequency harmonics of the incident laser. The frequency shift of these harmonics is proportional to the velocity of the target surface. In previous experiments at the Texas Petawatt we observed red-shifts in the 351nm harmonic up to 513nm, corresponding to a recession velocity of 0.18c. We designed an ultra-broadband GRENOUILLE to conduct time resolved measurements of spectral shifting of second harmonic light over the duration of the incident laser pulse. This GRENOUILLE is relay imaged from the target plane to prevent spectral splitting, and is an all reflective design to reduce pulse broadening and chromatic aberrations. With an f/3.15 optic focusing into a thick BBO crystal, the system accepts wavelengths from 526nm to 766nm with 4.8nm spectral resolution and 5.6fs temporal resolution. This work was supported by NNSA cooperative agreement DE-NA0002008.

  14. Asymmetric gradient coil design for use in a short, open bore magnetic resonance imaging scanner

    Science.gov (United States)

    Wang, Yaohui; Liu, Feng; Li, Yu; Tang, Fangfang; Crozier, Stuart

    2016-08-01

    A conventional cylindrical whole-body MRI scanner has a long bore that may cause claustrophobia for some patients in addition to being inconvenient for healthcare workers accessing the patient. A short-bore scanner usually offers a small sized imaging area, which is impractical for imaging some body parts, such as the torso. This work proposes a novel asymmetric gradient coil design that offers a full-sized imaging area close to one end of the coil. In the new design, the primary and shielding coils are connected at one end whilst separated at the other, allowing the installation of the cooling system and shim trays. The proposed coils have a larger wire gap, higher efficiency, lower inductance, less resistance and a higher figure of merit than the non-connected coils. This half-connected coil structure not only improves the coils' electromagnetic performance, but also slightly attenuates acoustic radiation at most frequencies when compared to a non-connected gradient coil. It is also quieter in some frequency bands than a conventional symmetric gradient coil.

  15. D Modelling of Tunnel Excavation Using Pressurized Tunnel Boring Machine in Overconsolidated Soils

    Science.gov (United States)

    Demagh, Rafik; Emeriault, Fabrice

    2013-06-01

    The construction of shallow tunnels in urban areas requires a prior assessment of their effects on the existing structures. In the case of shield tunnel boring machines (TBM), the various construction stages carried out constitute a highly three-dimensional problem of soil/structure interaction and are not easy to represent in a complete numerical simulation. Consequently, the tunnelling- induced soil movements are quite difficult to evaluate. A 3D simulation procedure, using a finite differences code, namely FLAC3D, taking into account, in an explicit manner, the main sources of movements in the soil mass is proposed in this paper. It is illustrated by the particular case of Toulouse Subway Line B for which experimental data are available and where the soil is saturated and highly overconsolidated. A comparison made between the numerical simulation results and the insitu measurements shows that the 3D procedure of simulation proposed is relevant, in particular regarding the adopted representation of the different operations performed by the tunnel boring machine (excavation, confining pressure, shield advancement, installation of the tunnel lining, grouting of the annular void, etc). Furthermore, a parametric study enabled a better understanding of the singular behaviour origin observed on the ground surface and within the solid soil mass, till now not mentioned in the literature.

  16. Evaluation and improvement of economic efficiency in the sphere of bore-hole drilling methods

    Directory of Open Access Journals (Sweden)

    Kozlova Natalia V.

    2016-01-01

    Full Text Available One of the important requirements for the methods and technologies, especially in the extractive industry, is cost-effective use of resources. The amount of exploration and industrial bore-hole drilling for various purposes is increasing in today’s world. Since drilling is the main type of exploration, it is necessary to improve the technology and to reduce costs. The article discusses an alternative to the existing method of bore-hole drilling developed in Tomsk Polytechnic University on the basis of the discovery made by scientists of the University. Electric pulse drilling technology is an innovation with the estimated base of evidence. The technique consists of rock breaking without drilling in it. This technology is fundamentally different from the existing ones; therefore, its application requires modification and updating of all operation systems. High barriers to entry and introduction to the industry are specific to electric pulse drilling. The authors concluded that the technology of electric pulse drilling provides an alternative of production methods and tools, which allows finding the best option to reduce costs and thereby to increase resource efficiency of production or project.

  17. Measurement of in-bore side loads and comparison to first maximum yaw

    Institute of Scientific and Technical Information of China (English)

    Donald E. CARLUCCI; Ryan DECKER; Julio VEGA; Douglas RAY

    2016-01-01

    In-bore yaw of a projectile in a gun tube has been shown to result in range loss if the yaw is significant. An attempt was made to determine if relationships between in-bore yaw and projectile First Maximum Yaw (FMY) were observable. Experiments were conducted in which pressure transducers were mounted near the muzzle of a 155 mm cannon in three sets of four. Each set formed a cruciform pattern to obtain a differential pressure across the projectile. These data were then integrated to form a picture of what the overall pressure distribution was along the side of the projectile. The pressure distribution was used to determine a magnitude and direction of the overturning moment acting on the projectile. This moment and its resulting angular acceleration were then compared to the actual first maximum yaw observed in the test. The degree of correlation was examined using various statistical techniques. Overall uncertainty in the projectile dynamics was between 20%and 40%of the mean values of FMY.

  18. Measurement of in-bore side loads and comparison to first maximum yaw

    Directory of Open Access Journals (Sweden)

    Donald E. Carlucci

    2016-04-01

    Full Text Available In-bore yaw of a projectile in a gun tube has been shown to result in range loss if the yaw is significant. An attempt was made to determine if relationships between in-bore yaw and projectile First Maximum Yaw (FMY were observable. Experiments were conducted in which pressure transducers were mounted near the muzzle of a 155 mm cannon in three sets of four. Each set formed a cruciform pattern to obtain a differential pressure across the projectile. These data were then integrated to form a picture of what the overall pressure distribution was along the side of the projectile. The pressure distribution was used to determine a magnitude and direction of the overturning moment acting on the projectile. This moment and its resulting angular acceleration were then compared to the actual first maximum yaw observed in the test. The degree of correlation was examined using various statistical techniques. Overall uncertainty in the projectile dynamics was between 20% and 40% of the mean values of FMY.

  19. Design of a Large-Bore 60-T Pulse Magnet for Sandia National Laboratories

    International Nuclear Information System (INIS)

    The design of a new pulsed magnet system for the generation of intense electron beams is presented. Determined by the required magnetic field profile along the axis, the magnet system consists of two coils (Coil No.1 and No.2) separated by a 32-mm axial gap. Each coil is energized independently. Both coils are internally reinforced with HIM Zylon fiber/epoxy composite. Coil No.1 made with AI-15 Glidcop wire has a bore of 110-mm diameter and is 200-mm long; it is energized by a 1.3-MJ, 13-kV capacitor bank. The magnetic field at the center of this coil is 30 T. Coil No.2 made with CuNb wire has a bore of 45 mm diameter, generates 60 T with a pulse duration of 60 ms, and is powered by a 4.0-MJ, 17.7-kV capacitor bank. We present design criteria, the coupling of the magnets, and the normal and the fault conditions during operation

  20. STABILITY AND VIBRATION OF DRILL STRINGS WITH INTERNAL FLOWS OF LIQUIDS IN THE CHANNELS OF HORIZONTAL BORE-HOLES

    Directory of Open Access Journals (Sweden)

    Andrusenko E.N.

    2015-12-01

    Full Text Available In connection with elaboration of new technologies of hydrocarbons extraction from shales, in the oil and gas industry, the great attention is payed to the problems of drilling inclined and horizontal bore-holes. The peculiarities of these bore-hole drivage consist in essential influence of friction and contact forces on proceeding of drilling processes. In this paper, the problem about bifurcational buckling and small bending vibration of a rotating drill string lying in the channel of a horizontal bore-hole is stated. With allowance made for friction forces and additional constraint reactions, differential equations are deduced, their eigen-value solutions describing stability and vibration of the drill string of finite and infinite lengths are received.

  1. A two-compartment phantom for VOI profile measurements in small-bore 31P MR spectroscopy

    DEFF Research Database (Denmark)

    Vikhoff, Babro; Stubgaard, Max; Stensgaard, Anders;

    1998-01-01

    A two-compartment gel phantom for VOI profile measurements in volume-selective 31P spectroscopy in small-bore units is presented. The phantom is cylindrical with two compartments divided by a very thin (30 microm) polyethene film. This thin film permits measurements with a minimum of susceptibility...... influences from the partition wall. The phantom was used for evaluation of the volume selection method ISIS (image-selected in vivo spectroscopy). The position of the phantom was fixed in the magnet during the measurements, while the volume of interest (VOI) was moved stepwise over the border. The signal...... from the two compartments was measured for each position and the data were evaluated following differentiation. We have found this phantom suitable for VOI profile measurements of ISIS in small-bore systems. The phantom forms a useful complement to recommended phantoms for small bore-spectroscopy...

  2. A two-compartment phantom for VOI profile measurements in small-bore 31P MR spectroscopy

    International Nuclear Information System (INIS)

    A two-compartment gel phantom for VOI profile measurements in volume-selective 31P spectroscopy in small-bore units is presented. The phantom is cylindrical with two compartments divided by a very thin (30 μm) polyethene film. This thin film permits measurements with a minimum of susceptibility influences from the partition wall. The phantom was used for evaluation of the volume selection method ISIS (image-selected in vivo spectroscopy). The position of the phantom was fixed in the magnet during the measurements, while the volume of interest (VOI) was moved stepwise over the border. The signal from the two compartments was measured for each position and the data were evaluated following differentiation. We have found this phantom suitable for VOI profile measurements of ISIS in small-bore systems. The phantom forms a useful complement to recommended phantoms for small bore-spectroscopy. (author)

  3. Dynamic nuclear polarization for magnetic resonance imaging. An in-bore approach

    Energy Technology Data Exchange (ETDEWEB)

    Krummenacker, Jan G.

    2012-07-01

    In this thesis, the development of an in-bore liquid state DNP polarizer for MRI applications operating in flow through mode at a magnetic field strength of 1.5 T was described. After an introductory chapter 1 and a chapter 2 on the theoretical background, chapter 3 dealt chiefly with the challenge of performing liquid state DNP at a high magnetic field of 9.2 T. The feasibility of performing liquid state DNP at this field was demonstrated for various solvents, as well as for metabolites in solution. Chapter 4 then moved to the aim of this work, the application of liquid state DNP for MRI experiments. It introduced the rationale of our approach, the hardware that was developed and demonstrated its performance in a clinical MRI tomograph.

  4. Ecology of the Wood-boring Bivalve Martesia striata (Pholadidae) in Indian Waters

    Science.gov (United States)

    Yennawar, P. L.; Thakur, N. L.; Anil, A. C.; Venkat, K.; Wagh, A. B.

    1999-08-01

    Martesia striata (Linnaeus) is one of the dominant wood-boring organisms found in Indian waters. Incidence of this organism in the Zuari estuary (Goa) was evaluated by exposing wooden panels (Mangifera indica) to the marine environment between January 1996 and January 1997. Effects of salinity variation on embryonic and larval development were evaluated (salinity 0, 10, 20, 30, 35, 40 and 50, temperature 25 °C) and maximum metamorphic success was observed at 30 salinity. Results of the rearing experiments, destruction pattern of wood in the environment and reproductive biology indicate that although recruitment is halted during the monsoon, adults survive and become reproductively mature in the following post-monsoon, leading to increased recruitment during pre-monsoon months.

  5. Modeling of propellant flow and explosively-driven valve for the Large-Bore Powder Gun

    Science.gov (United States)

    Lam, Kin

    2014-05-01

    The Large-Bore Powder Gun is being developed to provide impact experiments on physics samples at the Nevada Test Site. A confinement system is required to seal the target chamber from the gun system to keep it free of hazardous materials from the impact event. A key component of the confinement system is an explosively driven valve (EDV), which uses a small amount of explosive to drive an aluminum piston perpendicular to the barrel axis into a tapered hole. The objective of this study is to evaluate designs of the confinement system via computational simulations using models validated with prototype experiments. A novel approach is adopted for this work, in which an energy source developed based on interior ballistic calculations was implemented in a hydrocode, which in turn was used to model the propellant flow, EDV operation, and their interactions. This paper describes the models and some simulation results leading to a proposed confinement system design.

  6. Measurements of laser-hole boring into overdense plasmas using x-ray laser refractometry (invited)

    Energy Technology Data Exchange (ETDEWEB)

    Kodama, R.; Takahashi, K.; Tanaka, K.A.; Kato, Y. [Institute of Laser Engineering (ILE), Osaka University, Suita, Osaka 565 (Japan); Murai, K. [DMP, ONRI, Ikeda, Osaka 563 (Japan); Weber, F.; Barbee, T.W.; DaSilva, L.B. [Lawrence Livermore National Laboratory, University of California, Livermore, California 94550 (United States)

    1999-01-01

    We developed a 19.6 nm laser x-ray laser grid-image refractometer (XRL-GIR) to diagnose laser-hole boring into overdense plasmas. The XRL-GIR was optimized to measure two-dimensional electron density perturbation on a scale of a few tens of {mu}m in underdense plasmas. Electron density profiles of laser-produced plasmas were obtained for 10{sup 20}{endash}10{sup 22}thinspcm{sup {minus}3} with the XRL-GIR and for 10{sup 19}{endash}10{sup 20}thinspcm{sup {minus}3} from an ultraviolet interferometer, the profiles of which were compared with those from hydrodynamic simulation. By using this XRL-GIR, we directly observed laser channeling into overdense plasmas accompanied by a bow shock wave showing a Mach cone ascribed to supersonic propagation of the channel front. {copyright} {ital 1999 American Institute of Physics.}

  7. Dynamic nuclear polarization for magnetic resonance imaging. An in-bore approach

    International Nuclear Information System (INIS)

    In this thesis, the development of an in-bore liquid state DNP polarizer for MRI applications operating in flow through mode at a magnetic field strength of 1.5 T was described. After an introductory chapter 1 and a chapter 2 on the theoretical background, chapter 3 dealt chiefly with the challenge of performing liquid state DNP at a high magnetic field of 9.2 T. The feasibility of performing liquid state DNP at this field was demonstrated for various solvents, as well as for metabolites in solution. Chapter 4 then moved to the aim of this work, the application of liquid state DNP for MRI experiments. It introduced the rationale of our approach, the hardware that was developed and demonstrated its performance in a clinical MRI tomograph.

  8. Optical probing of shocks driven into overdense plasmas by laser hole-boring

    CERN Document Server

    Dover, N P; Babzien, M; Bell, A R; Dangor, A E; Horbury, T; Ispiriyan, M; Polyanskiy, M N; Schreiber, J; Schwartz, S; Shkolnikov, P; Yakimenko, V; Pogorelsky, I; Najmudin, Z

    2012-01-01

    Observations of the interaction of an intense {\\lambda}0 \\approx 10 {\\mu}m laser pulse with near-critical overdense plasmas (ne = 1.8 - 3 nc) are presented. For the first time, transverse optical probing is used to show a recession of the front surface caused by radiation pressure driven hole-boring by the laser pulse with an initial velocity > 10^6 ms-1, and the resulting collisionless shocks. The collisionless shock propagates through the plasma, dissipates into an ion-acoustic solitary wave, and eventually becomes collisional as it slows further. These conclusions are supported by PIC simulations which show that the initial evolution is dominated by collisionless mechanisms.

  9. Design And Construction Of A 15 T, 120 MM Bore IR Quadrupole Magnet For LARP

    International Nuclear Information System (INIS)

    Pushing accelerator magnets beyond 10 T holds a promise of future upgrades to machines like the Large Hadron Collider (LHC) at CERN. Nb3Sn conductor is at the present time the only practical superconductor capable of generating fields beyond 10 T. In support of the LHC Phase-II upgrade, the US LHC Accelerator Research Program (LARP) is developing a large bore (120 mm) IR quadrupole (HQ) capable of reaching 15 T at its conductor peak field and a peak gradient of 219 T/m at 1.9 K. While exploring the magnet performance limits in terms of gradient, forces and stresses the 1 m long two-layer coil will demonstrate additional features such as alignment and accelerator field quality. In this paper we summarize the design and report on the magnet construction progress.

  10. Modeling of propellant flow and explosively-driven valve for the Large-Bore Powder Gun

    International Nuclear Information System (INIS)

    The Large-Bore Powder Gun is being developed to provide impact experiments on physics samples at the Nevada Test Site. A confinement system is required to seal the target chamber from the gun system to keep it free of hazardous materials from the impact event. A key component of the confinement system is an explosively driven valve (EDV), which uses a small amount of explosive to drive an aluminum piston perpendicular to the barrel axis into a tapered hole. The objective of this study is to evaluate designs of the confinement system via computational simulations using models validated with prototype experiments. A novel approach is adopted for this work, in which an energy source developed based on interior ballistic calculations was implemented in a hydrocode, which in turn was used to model the propellant flow, EDV operation, and their interactions. This paper describes the models and some simulation results leading to a proposed confinement system design.

  11. Efficacy and safety in performing of large bore percutaneous nephrostomy under ultrasound guidance

    International Nuclear Information System (INIS)

    The aim of the study was to compare the success rate, complications and the outcomes from large-bore percutaneous nephrostomy under ultrasound guidance performed to 178 cases with another 54 when nephrostomy under x-ray control was performed. We have performed 178 large-bore percutaneous nephrostomy under ultrasound guidance and another 54 percutaneous nephrostomy under x-ray guidance to patients diagnosed with obstructive uropathy resulting from benign or malignant supravesical obstruction. We have performed successful nephrostomy in 93,8% of the cases under ultrasound guidance and 100% successful nephrostomy in the cases under x-ray control. In 2,8% of patients under ultrasound guidance the nephrostomy was performed using 4 additional punctures of the pyelocaliceal system and artificially caused hydronephrosis via infiltration of normal saline; and in the remaining 1,7% it was successful at the second attempt after 24 hours. It was not necessary to perform open surgery nephrostomy in any of the cases. The performance of percutaneous nephrostomy under ultrasound guidance has a success rate similar to the one done under x-ray guidance and with commensurable frequency and severity of complications, however without the patient and the operator being exposed to x-ray radiation. In general, the percutaneous nephrostomy under ultrasound guidance is performed without difficulties in the cases of third or fourth degree hydronephrosis. The lateral decubital patient position, the appropriate place for the puncture, the usage of Color Doppler imaging when the puncture is performed and the continuos ultrasound guidance during dilatation and placement of the nephrostomy tube should ensure the successful performance of the procedure in the case of first or second degree hydronephrosis. When hydronephrosis is absent, the nephrostomy should be performed under x-ray guidance. In emergency cases the application of ultrasound guidance allows the nephrostomy to be performed along the

  12. CFD Modelling of Bore Erosion in Two-Stage Light Gas Guns

    Science.gov (United States)

    Bogdanoff, D. W.

    1998-01-01

    A well-validated quasi-one-dimensional computational fluid dynamics (CFD) code for the analysis of the internal ballistics of two-stage light gas guns is modified to explicitly calculate the ablation of steel from the gun bore and the incorporation of the ablated wall material into the hydrogen working cas. The modified code is used to model 45 shots made with the NASA Ames 0.5 inch light gas gun over an extremely wide variety of gun operating conditions. Good agreement is found between the experimental and theoretical piston velocities (maximum errors of +/-2% to +/-6%) and maximum powder pressures (maximum errors of +/-10% with good igniters). Overall, the agreement between the experimental and numerically calculated gun erosion values (within a factor of 2) was judged to be reasonably good, considering the complexity of the processes modelled. Experimental muzzle velocities agree very well (maximum errors of 0.5-0.7 km/sec) with theoretical muzzle velocities calculated with loading of the hydrogen gas with the ablated barrel wall material. Comparison of results for pump tube volumes of 100%, 60% and 40% of an initial benchmark value show that, at the higher muzzle velocities, operation at 40% pump tube volume produces much lower hydrogen loading and gun erosion and substantially lower maximum pressures in the gun. Large muzzle velocity gains (2.4-5.4 km/sec) are predicted upon driving the gun harder (that is, upon using, higher powder loads and/or lower hydrogen fill pressures) when hydrogen loading is neglected; much smaller muzzle velocity gains (1.1-2.2 km/sec) are predicted when hydrogen loading is taken into account. These smaller predicted velocity gains agree well with those achieved in practice. CFD snapshots of the hydrogen mass fraction, density and pressure of the in-bore medium are presented for a very erosive shot.

  13. Automotive engine cylinder block cylinder bore biaxial fine boring process%汽车发动机汽缸体缸孔双轴精镗加工工艺

    Institute of Scientific and Technical Information of China (English)

    肖铁忠; 罗静; 龚文均; 詹捷; 赵勇

    2013-01-01

    Aiming to an automobile engine cylinder block cylinder bore processing equipment and process requirements , this project compared the development of the cylinder hole boring machining center and special machine in home and abroad, and it analyzed the pros and cons of the two cylinder processing production line which is used the most widely. It chose the "hybrid flexible automatic production line" that companies and machine manufacturers consider priorly, designed a special boring machine of cylinder hole machining, special fixtures and process. Through the trial of the machine and cylinder bore machining experiment, the result of the test shows that the precisions of the cylinder bore reached the design index. Eventually, this project was put into operation in an enterprise.%针对某汽车发动机缸体缸孔加工设备与工艺要求,对国内外缸孔镗削加工中心与专用机床发展情况进行了对比,分析了应用最广泛的两种缸体加工生产线的优劣,选择了汽车企业与机床厂商均优先考虑的“混合型柔性自动线”,设计了缸孔加工专用镗床、专用夹具及工艺.通过机床的试制与缸孔加工实验,测得缸孔各项精度均达到了设计指标,最终在某企业得以投产.

  14. ENVIRONMENTAL ASSESSMENT OF NOX CONTROL ON A SPARK-IGNITED LARGE BORE RECIPROCATING INTERNAL COMBUSTION ENGINE. VOLUME 2. DATA SUPPLEMENT

    Science.gov (United States)

    Volume II of the report is a compendium of detailed emission and test data from field tests of a large-bore, spark-ignited reciprocating engine and laboratory analyses of collected samples. The engine was tested in two operating modes: a baseline (normal) operation, and with incr...

  15. ENVIRONMENTAL ASSESSMENT OF NOX CONTROL ON A COMPRESSION IGNITION LARGE BORE RECIPROCATING INTERNAL COMBUSTION ENGINE. VOLUME 1. TECHNICAL RESULTS

    Science.gov (United States)

    Volume I of the report gives emission results from field tests of the exhaust gas from a large-bore, compression-ignition reciprocating engine burning diesel fuel. An objective of the tests was to evaluate the operating efficiency of the engine with combustion modification NOx co...

  16. Internal bore seasonality and tidal pumping of subthermocline waters at the head of the Monterey submarine canyon

    Science.gov (United States)

    Walter, Ryan K.; Phelan, P. Joe

    2016-03-01

    This study utilizes more than a year of observations made in shallow waters (~30 m) at the head of the Monterey Submarine Canyon to assess variability in the physical environment and internal bore field. The interaction of the internal tide with the canyon rim results in a semidiurnal tidal period pumping of cold-water masses (subthermocline waters) onto the adjacent shelf (i.e., internal bores). These internal bores are shown to be significantly coherent with the local sea surface height with minimal spatial variability when comparing two sites near the canyon head region. During the summer months, and periods of strong regional wind-driven upwelling and shoaling of the offshore thermocline, the canyon rim sites display elevated semidiurnal temperature variance. This semidiurnal variability reaches its annual minimum during the winter months when the regional upwelling favorable winds subside and the offshore thermocline deepens. Additionally, the observed internal bores show a distinct asymmetry between the leading (gradual cooling with velocities directed onto the shelf) and trailing edges (sharp warming with velocities directed into the canyon). It appears that the semidiurnal internal tide at the canyon head is a first-order control on the delivery of subthermocline waters to the nearshore coastal environment at this location.

  17. Three-dimensional rail-current distribution near the armature of simple, square-bore, two-rail railguns

    Energy Technology Data Exchange (ETDEWEB)

    Beno, J.H. (US Army (US))

    1991-01-01

    In this paper vector potential is solved as a three dimensional, boundary value problem for a conductor geometry consisting of square-bore railgun rails and a stationary armature. Conductors are infinitely conducting and perfect contact is assumed between rails and the armature. From the vector potential solution, surface current distribution is inferred.

  18. Genome Sequence of Fusarium Isolate MYA-4552 from the Midgut of Anoplophora glabripennis, an Invasive, Wood-Boring Beetle

    Science.gov (United States)

    Scully, Erin D.; Geib, Scott M.; Hoover, Kelli; Carlson, John E.

    2016-01-01

    The Fusarium solani species complex (FSSC) is a clade of environmentally ubiquitous fungi that includes plant, animal, and insect associates. Here, we report the draft genome sequence of the undescribed species FSSC 6 (isolate MYA-4552), housed in the gut of the wood-boring cerambycid beetle Anoplophora glabripennis. PMID:27445364

  19. Bivalve wood borings of the ichnogenus Teredolites Leymerie from the Bohemian Cretaceous Basin (Upper Cretaceous, Czech Republic)

    Czech Academy of Sciences Publication Activity Database

    Kříž, J.; Mikuláš, Radek

    2006-01-01

    Roč. 13, č. 3 (2006), s. 159-174. ISSN 1042-0940 Institutional research plan: CEZ:AV0Z30130516 Keywords : Borings * Mollusca * sedimentary environment Subject RIV: EG - Zoology http://rzblx1.uni-regensburg.de/ezeit/detail.phtml?bibid=CASCR&colors=7&lang=en&jour_id=41560

  20. Cause Analysis for the Wall Thinning and Leakage of a Small Bore Piping Downstream of an Orifice

    Energy Technology Data Exchange (ETDEWEB)

    Hwang, Kyeong Mo [KEPCO E and C, Yongin (Korea, Republic of)

    2013-05-15

    A number of components installed in the secondary system of nuclear power plants are exposed to aging mechanisms such as FAC (Flow-Accelerated Corrosion), Cavitation, Flashing, and LDIE (Liquid Droplet Impingement Erosion). Those aging mechanisms can lead to thinning of the components. In April 2013, one (1) inch small bore piping branched from the main steam line experienced leakage resulting from wall thinning in a 1,000 MWe Korean PWR nuclear power plant. During the normal operation, extracted steam from the main steam line goes to condenser through the small bore piping. The leak occurred in the downstream of an orifice. A control valve with vertical flow path was placed on in front of the orifice. This paper deals with UT (Ultrasonic Test) thickness data, SEM images, and numerical simulation results in order to analyze the extent of damage and the cause of leakage in the small bore piping. As a result, it is concluded that the main cause of the small bore pipe wall thinning is liquid droplet impingement erosion. Moreover, it is observed that the leak occurred at the reattachment point of the vortex flow in the downstream side of the orifice.

  1. ENVIRONMENTAL ASSESSMENT OF NOX CONTROL ON A COMPRESSION IGNITION LARGE BORE RECIPROCATING INTERNAL COMBUSTION ENGINE. VOLUME 2. DATA SUPPLEMENT

    Science.gov (United States)

    Volume II of the report is a compendium of detailed emission and test data from field tests of a large-bore, compression-ignition reciprocating engine burning diesel fuel. The engine was tested during two operating modes: at baseline (normal operation), and with fuel injection re...

  2. Welding device for tubular piece fixed into a bore of a plate such as a steam generator tube plate

    International Nuclear Information System (INIS)

    The device for welding a tube to the inside of a bore in a steam generator tube plate has a movable assembly connecting a welding head to a fixing arrangement fitted into an adjacent tube. The connecting arrangement allows relative displacement between the two connected elements of translation in a sideway direction and of rotation about two perpendicular axes

  3. Technology Based on Wall-Thinning Prediction and Numerical Analysis Techniques for Wall-Thinning Analysis of Small-Bore Carbon Steel Piping

    International Nuclear Information System (INIS)

    In approximately fifty utilities, including KHNP (Korea Hydro and Nuclear Power), CHECWORKS is used as a tool for predicting and managing the wall thinning of carbon steel piping; this wall thinning is caused by flow-accelerated corrosion (FAC). It is known that CHECWORKS is only applicable to predict the wall thinning of piping with large bores. When dealing with small-bore steel piping, FAC engineers measure the thickness of the susceptible area that is selected on the basis of the experience and judgment of the engineer. This paper proposes the application of CHECWORKS for the management of wall thinning of small-bore piping. Four small-bore pipelines of a domestic nuclear power plant were analyzed from the viewpoints of FAC and fluid dynamics by using CHECWORKS and FLUENT code. Depending on the engineer's skill, CHECWORKS can also be used for the management of wall thinning of small-bore piping

  4. Genesis of the central zone of the Nolans Bore rare earth element deposit, Northern Territory, Australia

    Science.gov (United States)

    Schoneveld, Louise; Spandler, Carl; Hussey, Kelvin

    2015-08-01

    The Nolans Bore rare earth element (REE) deposit consists of a network of fluorapatite-bearing veins and breccias hosted within Proterozoic granulites of the Reynolds Range, Central Australia. Mineralisation is divided into three zones (north, central, and south-east), with the north and south-east zones consisting of massive REE-bearing fluorapatite veins, with minor brecciation and carbonate infill. The central zone is distinctively different in mineralogy and structure; it features extensive brecciation, a high allanite content, and a large, epidote-rich enveloping alteration zone. The central zone is a reworking of the original solid apatite veins that formed during the Chewings Orogeny at ca. 1525 Ma. These original apatite veins are thought to derive from phosphate-rich magmatic-hydrothermal fluid exsolved from as-yet unrecognised alkaline magmatic bodies at depth. We define four ore breccia types (BX1-4) in the central zone on the basis of detailed petrological and geochemical analysis of drillcore and thin sections. BX1 ore comprises fluorapatite with minor crackle brecciation with carbonate infill and resembles ore of the north and south-east zones. Breccia types BX2, BX3, and BX4 represent progressive stages of ore brecciation and development of calc-silicate mineral (amphibole, epidote, allanite, calcite) infill. Comparison of bulk ore sample geochemistry between breccia types indicates that REEs were not mobilised more than a few centimetres during hydrothermal alteration and brecciation. Instead, most of the REEs were partitioned from the original REE fluorapatite into newly formed allanite, REE-poor fluorapatite and minor REE carbonate in the breccias. Negative europium (Eu) anomalies in the breccia minerals are accounted for by a large positive Eu anomaly in epidote from the alteration zones surrounding the ore breccias. This observation provides a direct link between ore recrystallisation and brecciation, and the formation of the alteration halo in

  5. Implementation of virtual simulation with a wide-bore multislice helcalct scanner

    International Nuclear Information System (INIS)

    Full text: Multislice large-bore CT scanners specifically designed for radiotherapy have very recently become available. The issues relating to these type of scanners in radiotherapy and the implementation of virtual simulation are therefore of much current interest. A GE LightSpeed RT 4-slice helical CT scanner with a 80 cm bore size was installed in the radiation oncology department of the Newcastle Mater Hospital. This replaced our only simulator, a conventional unit. Specific issues relating to the imaging performance, and virtual simulation process with the large-bore multislice scanner were studied to ensure an accurate radiotherapy process. The detector array fully samples a 50 cm diameter scan circle. The reconstructed diameter can be increased to 65 cm with partial sampling of the extra volume. The GE Advantage Sim (ASim) virtual simulation software was commissioned, with transfer of CT images and DICOM RT plans to the Pinnacle radiotherapy planning system (RTPS) for dose calculation. Some specific issues investigated were: 1) The image quality performance for image reconstruction with the 65 cm area compared to 50 cm was measured with a line-pair phantom. 2) The accuracy of CT numbers with lateral position was assessed with a commercial electron density phantom. 3) Couch lateral movement and sag during acquisition were measured with the couch weighted with 86 kg. 4) The accuracy of the transfer of plans from ASim to Pinnacle was verified with known plan geometries. Image resolution throughout the entire CT image was found to be significantly lower when scan reconstruction was performed with 65 cm scan circle compared to 50 cm. The 0.3, 0.38 and 0.5 1p/mm bars were clearly distinguishable with the 50 cm reconstruction compared to only the 0.3 1p/mm bars in the 65 cm reconstruction. 2) CT numbers varied significantly outside the 50 cm reconstructed area. 3) Couch lateral movement during scanning was within 1 mm. Couch sag was 4 mm at the imaging plane

  6. Characterization of Single-Cylinder Small-Bore 4-Stroke CIDI Engine Combustion

    Energy Technology Data Exchange (ETDEWEB)

    Henein, N A

    2005-11-30

    Direct injection diesel engines power most of the heavy-duty vehicles. Due to their superior fuel economy, high power density and low carbon dioxide emissions, turbocharged, small bore, high speed, direct injection diesel engines are being considered to power light duty vehicles. Such vehicles have to meet stringent emission standards. However, it is difficult to meet these standards by modifying the in-cylinder thermodynamic and combustion processes to reduce engine-out emissions. After-treatment devices will be needed to achieve even lower emission targets required in the production engines to account for the anticipated deterioration after long periods of operation in the field. To reduce the size, mass and cost of the after-treatment devices, there is a need to reduce engine-out emissions and optimize both the engine and the aftertreatment devices as one integrated system. For example, the trade-off between engine-out NOx and PM, suggests that one of these species can be minimized in the engine, with a penalty in the other, which can be addressed efficiently in the after-treatment devices. Controlling engine-out emissions can be achieved by optimizing many engine design and operating parameters. The design parameters include, but are not limited to, the type of injection system: (CRS) Common Rail System, (HEUI ) Hydraulically Actuated and Electronically controlled Unit Injector, or (EUI) Electronic Unit Injector; engine compression ratio, combustion chamber design (bowl design), reentrance geometry, squish area and intake and exhaust ports design. With four-valve engines, the swirl ratio depends on the design of both the tangential and helical ports and their relative locations. For any specific engine design, the operating variables need also to be optimized. These include injection pressure, injection rate, injection duration and timing (pilot, main, and post injection), EGR ratio, and swirl ratio. The goal of the program is to gain a better understanding of

  7. Structure and mineralization of the Richton Dome Caprock Boring MRIG-9

    International Nuclear Information System (INIS)

    Observations of the texture, fracture fabric, and vein mineralization in the caprock core from Boring MRIG-9 were used to provide data on the origin, deformation, and alteration of the caprock at Richton Salt Dome. The anhydrite portion of the caprock was formed by accumulation of anhydrite residuum from the salt stock. Lithification appears to have occurred through pressure solution, with the compression being applied by the rising salt stock. The origin of the limestone caprock is not yet understood. The fracturing at MRIG-9 is interpreted to have been caused by the upward arching movement of the underlying salt stock. Water entered the fractures, causing anhydrite to alter to gypsum along the fracture walls. The transformation to gypsum involved a volume increase, which in turn induced additional fracturing and allowed further penetration of water into the anhydrite. Three hydrochemical events are observed in the anhydrite rock. In order of occurrence, they are (1) formation of gypsum veins, (2) slight dissolution of gypsum and precipitation of small quantities of calcite and sulfur, and (3) dissolution of both gypsum and calcite from a small fraction of the veins. The effects of all three events are limited to the fractures that are interpreted to have formed in late Oligocene

  8. A methodology for laser diagnostics in large-bore marine two-stroke diesel engines

    International Nuclear Information System (INIS)

    Large two-stroke diesel engines for marine propulsion offer several challenges to successful implementation of the laser diagnostic techniques applied extensively in smaller automotive engines. For this purpose a fully operational large-bore engine has been modified to allow flexible optical access, through 24 optical ports with clear diameters of 40 mm. By mounting the entire optical set-up directly to the engine, effects of the vigorous vibrations and thermal drifts on alignment can be minimized. Wide-angle observation and illumination, as well as relatively large aperture detection, is made possible through mounting of optical modules and relays inside optical ports. This allows positioning of the last optical element within 10 mm from the cylinder wall. Finally, the implementation on a multi-cylinder engine allows for flexible and independent operation of the optically accessible cylinder for testing purposes. The performance of the integrated optical engine and imaging system developed is demonstrated through laser Mie scattering imaging of fuel jet structures, from which information on liquid penetration and spray angles can be deduced. Double pulse laser-sheet imaging of native in-cylinder structures is also demonstrated, for the purpose of velocimetry. (paper)

  9. Small-bore pipe supports systematically load-rated by computer

    International Nuclear Information System (INIS)

    Small-bore pipe supports are used extensively in nuclear- and fossil-power plants. Standard designs have been systematically load-rated to qualify all structural components of the support for applied load, including the effects of support weight, friction, and local stress. The standards cover variations in member length, anchor bolt location, and attachment position within a prescribed zone on the baseplate. These standard small-borepipe supports were designed with the aid of a computer program specifically developed for this application. The program performs a stress analysis of each support using a unit load vector revolved in one-degree increments. To cover all possible attachment locations, the loading zone is defined by an arc with a 5-inch radius centered about the end of the support. Because the attachment follows the unit load as it moves from location to location, the attachment weight may be located anywhere within the prescribed zone. Since the unit load is revolved accompanied by a force of 0.3 lb applied normal to the unit load, the rated load includes the effect of friction. Each standard prequalified support is rated based on design criteria governing baseplates, welds, tube local stress, tube buckling, and support stiffness and frequency

  10. Progress in the development of an 88-mm bore 10 T $Nb_{3}$Sn dipole magnet

    CERN Document Server

    den Ouden, A; Kirby, G A; Taylor, T; Siegel, N; ten Kate, H H J

    2001-01-01

    A 10 T, 2-layer cos( theta )-dipole model magnet with an 88 mm clear bore utilizing an advanced powder-in-tube Nb/sub 3/Sn conductor is being developed for the LHC. A dedicated conductor development program has resulted in a well performing Rutherford cable containing strands that uniquely exhibit both an overall current density of 600 A/mm/sup 2/ @ 11 T and filaments with a diameter of 20 mu m. The resistance between crossing strands amounts to 30-70 mu Omega by insertion of a stainless steel core. After being exposed to a transverse pressure of 200 MPa identical cables show negligible permanent degradation of the critical current. The mechanical support structure is further optimized in order to reduce the peak stress in the mid-plane to below 130 MPa at full excitation and to control the pre-stress build-up during system assembly. Prior to the manufacturing of the final coils a dummy 2-layer pole is wound, heat- treated at 675 degrees C and vacuum resin impregnated. This paper presents the current status o...

  11. Automation of eddy current system for in-service inspection of turbine and generator bores

    International Nuclear Information System (INIS)

    The most commonly applied inspection method for ferromagnetic turbine and generator rotor bores is the magnetic particle test technique. This method is subjective, depends on the test operator's skill and diligence in identifying test indications, and suffers from poor repeatability, especially for small indications. Automation would improve repeatability. However, magnetic particle tests are not easily automated, because the data are in the form of sketches, photographs, and written and oral descriptions of the indications. Eddy current inspection has obvious potential to replace magnetic particle methods in this application. Eddy current tests can be readily automated, as the data are in the form of voltages that can be recorded, digitized, and manipulated by a computer. The current project continues the investigation of the correlation between eddy current and magnetic particle inspection. Two systems have been combined to acquire eddy current data automatically. This combination of systems consists of the Nortec-25L Eddyscope (to provide the analog eddy current signals) and the General Electric DATAQ (TM) System (to perform the automatic data acquisition). The automation of the system is discussed

  12. A Superconducting Magnet with Center Field of 10 T and φ100 mm Warm Bore

    Institute of Scientific and Technical Information of China (English)

    王秋良; 严陆光; 赵宝志; 宋守森

    2006-01-01

    A conduction-cooled superconducting magnet with central field of 10T and warm bore of 100 mm was designed based on a Nb3Sn and two NbTi superconducting coils. At the first stage, the NbTi coils have been fabricated and tested. A two-stage 4 K Gifford-McMahon (GM) cryocooler with the second-stage power in 1W, 4.2K is used to cool the magnet from room temperature to 4 K. The superconducting magnet with the same power supply has the operating current of 116A. The magnet can be rotated with a support frame to be operated with either horizontal or vertical position. A pair of Bi-2223 high temperature superconducting current leads was employed to reduce heat leakage into 4.2K level. The NbTi coils reachto the operating current of 120A without training effect to be observed during charging of the magnet during 40 minutes charging time and generate the center field of 6.5T. The training effect in the NbTi magnet directly cool-down by cryocooler and inter-winding support structure in magnet can be remarkably improved. The superconducting magnet has been stably operated for more than 275 hours with 6.5T. In this paper, the detailed design, fabrication, stress analysis and quench protection characteristics are presented.

  13. Initial studies of Bremsstrahlung energy deposition in small-bore superconducting undulator structures in linac environments

    Energy Technology Data Exchange (ETDEWEB)

    Cremer, T.; Tatchyn, R. [Stanford Univ., CA (United States)

    1995-12-31

    One of the more promising technologies for developing minimal-length insertion devices for linac-driven, single-pass Free Electron Lasers (FELs) operating in the x-ray range is based on the use of superconducting (SC) materials. In recent FEL simulations, for example, a bifilar helical SC device with a 2 cm period and 1.8 T field was found to require a 30 m saturation length for operation at 1.5{Angstrom} on a 15 GeV linac, more than 40% shorter than an alternative hybrid/permanent magnet (hybrid/PM) undulator. AT the same time, however, SC technology is known to present characteristic difficulties for insertion device design, both in engineering detail and in operation. Perhaps the most critical problem, as observed, e.g., by Madey and co-workers in their initial FEL experiments, was the frequent quenching induced by scattered electrons upstream of their (bifilar) device. Postulating that this quenching was precipitated by directly-scattered or bremsstrahlung-induced particle energy deposited into the SC material or into material contiguous with it, the importance of numerical and experimental characterizations of this phenomenon for linac-based, user-facility SC undulator design becomes evident. In this paper we discuss selected prior experimental results and report on initial EGS4 code studies of scattered and bremsstrahlung induced particle energy deposition into SC structures with geometries comparable to a small-bore bifilar helical undulator.

  14. Regressive approach for predicting bearing capacity of bored piles from cone penetration test data

    Directory of Open Access Journals (Sweden)

    Iyad S. Alkroosh

    2015-10-01

    Full Text Available In this study, the least square support vector machine (LSSVM algorithm was applied to predicting the bearing capacity of bored piles embedded in sand and mixed soils. Pile geometry and cone penetration test (CPT results were used as input variables for prediction of pile bearing capacity. The data used were collected from the existing literature and consisted of 50 case records. The application of LSSVM was carried out by dividing the data into three sets: a training set for learning the problem and obtaining a relationship between input variables and pile bearing capacity, and testing and validation sets for evaluation of the predictive and generalization ability of the obtained relationship. The predictions of pile bearing capacity by LSSVM were evaluated by comparing with experimental data and with those by traditional CPT-based methods and the gene expression programming (GEP model. It was found that the LSSVM performs well with coefficient of determination, mean, and standard deviation equivalent to 0.99, 1.03, and 0.08, respectively, for the testing set, and 1, 1.04, and 0.11, respectively, for the validation set. The low values of the calculated mean squared error and mean absolute error indicated that the LSSVM was accurate in predicting the pile bearing capacity. The results of comparison also showed that the proposed algorithm predicted the pile bearing capacity more accurately than the traditional methods including the GEP model.

  15. YUCCA MOUNTAIN SITE CHARACTERIZATIONS PROJECT TUNNEL BORING MACHINE (TBM) SYSTEM SAFETY ANALYSIS

    International Nuclear Information System (INIS)

    The purpose of this analysis is to systematically identify and evaluate hazards related to the tunnel boring machine (TBM) used in the Exploratory Studies Facility (ESF) at the Yucca Mountain Site Characterization Project. This process is an integral part of the systems engineering process; whereby safety is considered during planning, design, testing, and construction. Since the TBM is an ''as built'' system, the MandO is conducting the System Safety Analysis during the construction or assembly phase of the TBM. A largely qualitative approach was used since a radiological System Safety Analysis is not required. The risk assessment in this analysis characterizes the accident scenarios associated with the TBM in terms of relative risk and includes recommendations for mitigating all identified risks. The priority for recommending and implementing mitigation control features is: (1) Incorporate measures to reduce risks and hazards into the system/subsystem/component design, (2) add safety features and capabilities to existing designs, and (3) develop procedures and conduct training to increase worker awareness of potential hazards, on methods to reduce exposure to hazards, and on the actions required to avoid accidents or correct hazardous conditions. The scope of this analysis is limited to the TBM during normal operations, excluding hazards occurring during assembly and test of the TBM or maintenance of the TBM equipment

  16. ZEDEX - A study of damage and disturbance from tunnel excavation by blasting and tunnel boring

    International Nuclear Information System (INIS)

    The objectives of the ZEDEX project were to understand the mechanical behaviour of the excavation disturbed zone (EDZ) with respect to its origin, character, magnitude of property change, extent and its dependence on excavation method. Excavation with normal smooth blasting, blasting with low shock explosives and tunnel boring were studied. The drifts are located at Aespoe at a depth of 420 m, the profiles are circular and 5 m in diameter. The results have shown that there is a damaged zone, close to the drift wall dominated by changes in rock properties which are irreversible, and that there is a disturbed zone beyond the damaged zone that is dominated by changes in stress state and mainly reversible. There is no distinct boundary between the two zones. The results from ZEDEX indicate that the role of the EDZ as a preferential pathway to radionuclide transport is limited to the damaged zone. The extent of the damaged zone can be limited through application of appropriate excavation methods. By limiting the extent of the damaged zone it should also be feasible to block pathways in the damaged zone by plugs placed at strategic locations

  17. High natural radioactivity of bored wells as a radiation hygienic problem in Finland

    International Nuclear Information System (INIS)

    The high levels of natural radioactivity of ground water in some regions of Finland were detected some years ago. From the point of view of radiation exposure, the bored wells of private homes play a major role. Levels up to 1,2 μCi/l 222Rn and 256 pCi/l 226Ra have been found. The highest radiological risk is the radon liberated to air in connection of cooking, washing of dishes and clothes, bathing etc. In the measurements performed until now, the highest daily average concentration in air, to which the housewife was exposed, was 112 pCi/l, the highest concentration found in normal living conditions being 595 pCi/l (bathroom during washing of clothes). Measurements of radon levels in homes with high concentration of radon in water are going on with a view to determine the ratio of average radon concentrations in room air and household water. Chromosome analyses are performed in some cases when high cumulative radon exposure is suspected. Results gathered until the time of the final writing of the paper will be given. Risk estimates and need for remedial action are disc

  18. Conductor development for a wide bore 10 T $Nb_{3}Sn$ model dipole magnet

    CERN Document Server

    den Ouden, A; ten Kate, H H J; Kirby, G A; Taylor, T M; Siegel, N

    2000-01-01

    An 87.8 mm bore single aperture 10 T Nb/sub 3/Sn model dipole magnet is under development as a next step in the realization of high-field Nb/sub 3/Sn dipole magnets. The magnet is a 2 layer cos( theta )- dipole model as an alternative for the proposed NbTi D1 beam separator magnets for the LHC. After completion of the general magnetic and mechanical design, all attention is focused on the manufacturing and cabling of a novel powder-in-tube Nb/sub 3/Sn conductor. This Nb/sub 3/Sn conductor is characterized by a high non- Cu J/sub c/ of 2680 A/mm/sup 2/ at 10 T with an effective filament size of about 20 mu m. Cabling should result in a Rutherford type of cable exhibiting a moderate J/sub c/ degradation due to the cabling process itself, a low transverse stress sensitivity and a controllable minimum value of R/sub c/. The conductor development program is presented and the results are evaluated. Progress on the actual realization of the coils is briefly described. (9 refs).

  19. Eaten up by boredom: consuming food to escape awareness of the bored self.

    Science.gov (United States)

    Moynihan, Andrew B; van Tilburg, Wijnand A P; Igou, Eric R; Wisman, Arnaud; Donnelly, Alan E; Mulcaire, Jessie B

    2015-01-01

    Research indicates that being bored affectively marks an appraised lack of meaning in the present situation and in life. We propose that state boredom increases eating in an attempt to distract from this experience, especially among people high in objective self-awareness. Three studies were conducted to investigate boredom's effects on eating, both naturally occurring in a diary study and manipulated in two experiments. In Study 1, a week-long diary study showed that state boredom positively predicted calorie, fat, carbohydrate, and protein consumption. In Study 2, a high (vs. low) boredom task increased the desire to snack as opposed to eating something healthy, especially amongst those participants high in objective self-awareness. In addition, Study 3 demonstrated that among people high in objective self-awareness, high (vs. low) boredom increased the consumption of less healthy foods and the consumption of more exciting, healthy foods. However, this did not extend to unexciting, healthy food. Collectively, these novel findings signify the role of boredom in predicting maladaptive and adaptive eating behaviors as a function of the need to distant from the experience of boredom. Further, our results suggest that more exciting, healthy food serves as alternative to maladaptive consumption following boredom. PMID:25883579

  20. From air to rubber: New techniques for measuring and replicating mouthpieces, bocals, and bores

    Science.gov (United States)

    Fuks, Leonardo

    2002-11-01

    The history of musical instruments comprises a long genealogy of models and prototypes that results from a combination of copying existing specimens with the change in constructive parameters, and the addition of new devices. In making wind instruments, several techniques have been traditionally employed for extracting the external and internal dimensions of toneholes, air columns, bells, and mouthpieces. In the twentieth century, methods such as pulse reflectometry, x-ray, magnetic resonance, and ultrasound imaging have been made available for bore measurement. Advantages and drawbacks of the existing methods are discussed and a new method is presented that makes use of the injection and coating of silicon rubber, for accurate molding of the instrument. This technique is harmless to all traditional materials, being indicated also for measurements of historical instruments. The paper presents dimensional data obtained from clarinet and saxophone mouthpieces. A set of replicas of top quality clarinet and saxophone mouthpieces, trombone bocals, and flute headjoints is shown, with comparative acoustical and performance analyses. The application of such techniques for historical and modern instrument analysis, restoration, and manufacturing is proposed.

  1. Arrival of the Robbins machine in LSS1 after completing the boring of the SPS tunnel.

    CERN Multimedia

    1974-01-01

    A few months after the signature of the agreement giving the go-ahead for the expansion of CERN into French territory (see Bulletin no.24/2004), work began on the Super Proton Synchrotron (SPS). Two years later, on 31 July 1974, the Robbins tunnel-boring machine excavating the SPS tunnel returned to its starting point (see photograph). It had excavated a tunnel with a circumference of 7 kilometres, at an average depth of 40 metres below the surface. The tunnel straddled the Franco-Swiss border, making the SPS the first cross-border accelerator. More than a thousand magnets were needed to equip the ring. The civil engineering and installation work was completed in record time after only four years. The SPS was equipped with a control system which was ahead of its time, consisting of 24 small control computers distributed in the tunnel and the control room and communicating by means of a high-rate data transmission system. The main control room housed only four consoles as opposed to the banks of electronic eq...

  2. Triple-bore hollow fiber membrane contactor for liquid desiccant based air dehumidification

    KAUST Repository

    Bettahalli, N.M. Srivatsa

    2016-04-26

    Dehumidification is responsible for a large part of the energy consumption in cooling systems in high humidity environments worldwide. Improving efficiency is therefore essential. Liquid desiccants offer a promising solution for dehumidification, as desired levels of humidity removal could be easily regulated. The use of membrane contactors in combination with liquid desiccant is attractive for dehumidification because they prevent direct contact between the humid air and the desiccant, removing both the potential for desiccant carryover to the air and the potential for contamination of the liquid desiccant by dust and other airborne materials, as well as minimizing corrosion. However, the expected additional mass transport barrier of the membrane surface can lower the expected desiccation rate per unit of desiccant surface area. In this context, hollow fiber membranes present an attractive option for membrane liquid desiccant contactors because of their high surface area per unit volume. We demonstrate in this work the performance of polyvinylidene fluoride (PVDF) based triple-bore hollow fiber membranes as liquid desiccant contactors, which are permeable to water vapor but impermeable to liquid water, for dehumidification of hot and humid air.

  3. Introducing passive acoustic filter in acoustic based condition monitoring: Motor bike piston-bore fault identification

    Science.gov (United States)

    Jena, D. P.; Panigrahi, S. N.

    2016-03-01

    Requirement of designing a sophisticated digital band-pass filter in acoustic based condition monitoring has been eliminated by introducing a passive acoustic filter in the present work. So far, no one has attempted to explore the possibility of implementing passive acoustic filters in acoustic based condition monitoring as a pre-conditioner. In order to enhance the acoustic based condition monitoring, a passive acoustic band-pass filter has been designed and deployed. Towards achieving an efficient band-pass acoustic filter, a generalized design methodology has been proposed to design and optimize the desired acoustic filter using multiple filter components in series. An appropriate objective function has been identified for genetic algorithm (GA) based optimization technique with multiple design constraints. In addition, the sturdiness of the proposed method has been demonstrated in designing a band-pass filter by using an n-branch Quincke tube, a high pass filter and multiple Helmholtz resonators. The performance of the designed acoustic band-pass filter has been shown by investigating the piston-bore defect of a motor-bike using engine noise signature. On the introducing a passive acoustic filter in acoustic based condition monitoring reveals the enhancement in machine learning based fault identification practice significantly. This is also a first attempt of its own kind.

  4. Design of MEBT short Q-magnets with large bores using MAFIA for the JHP proton linac

    Energy Technology Data Exchange (ETDEWEB)

    Yoshino, Kazuo; Kato, Takao; Ueno, Akira; Yamazaki, Yoshishige [National Lab. for High Energy Physics, Tsukuba, Ibaraki (Japan)

    1994-12-31

    A radio-frequency quadrupole (RFQ) linac and a drift-tube linac (DTL) are under development for the 1-GeV high-intensity proton linac of the JHP. The design of quadrupole magnets to be used in the medium-energy beam transport line (MEBT) from RFQ to DTL is described in this paper. Since the quadrupole magnets are short, being comparable to (1.4 to 2 times as long as) the bore diameter, the leakage flux along the beam axis is quite significant. Therefore, the multipole components of magnetic fields arising from the leakage flux should be minimized by choosing the pole-piece shape on the basis of the three-dimensional analysis. The integral of the field gradient along the beam axis could be flattened within 1x10{sup -3} from the beam center to the bore radius. (author).

  5. Design and experimental results of the Nb3Sn double insert for an 18 tesla, 100 mm free bore solenoid

    International Nuclear Information System (INIS)

    A high field, large free bore (more than 100 mm at 4.2 K) solenoid for the LASA Lab of INFN-Milan is almost completed. The Nb3Sn insert, constituted by two coils independently supplied, is designed to provide a central field in excess of 18 tesla when immersed in the background field of 8 tesla when immersed in the background field of 8 tesla generated by a NbTi solenoid of 550 mm room temperature bore (this last solenoid already being in operation). The construction technique--W and R followed by vacuum impregnation--is described and the results of tests and measurements carried out on models wound with the real conductor (a NbSn/Cu Rutherford flat cable) are reported

  6. Ion beams extraction and measurements of plasma parameters on a multi-frequencies microwaves large bore ECRIS with permanent magnets

    International Nuclear Information System (INIS)

    We have developed an all-permanent magnet large bore electron cyclotron resonance ion source (ECRIS) for broad ion beam processing. The cylindrically comb-shaped magnetic field configuration is adopted for efficient plasma production and good magnetic confinement. To compensate for disadvantages of fixed magnetic configuration, a traveling wave tube amplifier (TWTA) is used. In the comb-shaped ECRIS, it is difficult to achieve controlling ion beam profiles in the whole inside the chamber by using even single frequency-controllable TWTA (11-13GHz), because of large bore size with all-magnets. We have tried controlling profiles of plasma parameters and then those of extracted ion beams by launching two largely different frequencies simultaneously, i.e., multi-frequencies microwaves. Here we report ion beam profiles and corresponding plasma parameters under various experimental conditions, dependence of ion beams against extraction voltages, and influence of different electrode positions on the electron density profile.

  7. Residual stress measurement of large-bore stainless steel pipe with butt-welded joint by inherent strain method

    International Nuclear Information System (INIS)

    This study describes residual stress distribution of large-bore and heavy-walled stainless steel pipe with butt-welded joint as measured by inherent strain method with distribution function in which the inherent strain distribution is represented as function. The deviation of the most probable residual stress value obtained by the method was enough small to indicate accurate measurement. The detail feature and 3D-distribution of the residual stress generated within the heavy-walled pipe with welded joint were discussed on two variously-sized pipe joints. It was found that the residual stress distribution had more complicated shape as the bore and thickness of the pipe was larger. (author)

  8. Design of an RF Antenna for a Large-Bore, High Power, Steady State Plasma Processing Chamber for Material Separation

    International Nuclear Information System (INIS)

    The purpose of this Cooperative Research and Development Agreement (CRADA) between UT-Battelle, LLC, (Contractor), and Archimedes Technology Group, (Participant) is to evaluate the design of an RF antenna for a large-bore, high power, steady state plasma processing chamber for material separation. Criteria for optimization will be to maximize the power deposition in the plasma while operating at acceptable voltages and currents in the antenna structure. The project objectives are to evaluate the design of an RF antenna for a large-bore, high power, steady state plasma processing chamber for material separation. Criteria for optimization will be to maximize the power deposition in the plasma while operating at acceptable voltages and currents in the antenna structure

  9. Selected Abiotic and Biotic Environmental Stress Factors Affecting Two Economically Important Sugarcane Stalk Boring Pests in the United States

    OpenAIRE

    Showler, Allan T.

    2016-01-01

    Sugarcane, Saccharum spp., in the United States is attacked by a number of different arthropod pests. The most serious among those pests are two stalk boring moths in the Family Crambidae: the sugarcane borer, Diatraea saccharalis (F.), and the Mexican rice borer, Eoreuma loftini (Dyar). The two species are affected by abiotic and biotic environmental stress factors. Water deficit and excessive soil nitrogen alter physical and physiochemical aspects of the sugarcane plant that make the crop i...

  10. Respiratory-Gated MRgHIFU in Upper Abdomen Using an MR-Compatible In-Bore Digital Camera

    OpenAIRE

    Vincent Auboiroux; Lorena Petrusca; Magalie Viallon; Arnaud Muller; Sylvain Terraz; Romain Breguet; Xavier Montet; Becker, Christoph D; Rares Salomir

    2014-01-01

    Objective. To demonstrate the technical feasibility and the potential interest of using a digital optical camera inside the MR magnet bore for monitoring the breathing cycle and subsequently gating the PRFS MR thermometry, MR-ARFI measurement, and MRgHIFU sonication in the upper abdomen. Materials and Methods. A digital camera was reengineered to remove its magnetic parts and was further equipped with a 7 m long USB cable. The system was electromagnetically shielded and operated inside the bo...

  11. Analysis of stresses at the bore of a drilled ball operating in a high-speed bearing. [with stiffening web

    Science.gov (United States)

    Coe, H. H.; Lynch, J. E.

    1973-01-01

    Three-dimensional stress distributions were calculated for both a regular drilled ball with a stiffening web. The balls were 20.6 mm (0.8125 in.) in diameter and had a 12.6 mm (0.496 in.) diameter concentric hole. The stiffening web was 1.5 mm (0.06 in.) thick. The calculations showed that a large reversing tangential stress at the hole bore was reduced by one-half by the addition of the web.

  12. Acceptance test procedure for the ultra high pressure bore head for use in the self-installing liquid observation well

    International Nuclear Information System (INIS)

    In order to monitor waste stored in single-shell tanks, liquid observation wells (LOWs) are installed to permit periodic insertion of instrumentation probes to evaluate the waste cross sections. An ultra high pressure water bore head, developed for installing instrument trees, was adapted for use with the LOWs. The modification facilitates the removal of the high pressure water feed system after installation. This document describes a series of tests that ensures that the design meets all the functional requirements

  13. North American Lauraceae: terpenoid emissions, relative attraction and boring preferences of redbay ambrosia beetle, Xyleborus glabratus (coleoptera: curculionidae: scolytinae.

    Directory of Open Access Journals (Sweden)

    Paul E Kendra

    Full Text Available The invasive redbay ambrosia beetle, Xyleborus glabratus, is the primary vector of Raffaelea lauricola, a symbiotic fungus and the etiologic agent of laurel wilt. This lethal disease has caused severe mortality of redbay (Persea borbonia and swampbay (P. palustris trees in the southeastern USA, threatens avocado (P. americana production in Florida, and has potential to impact additional New World species. To date, all North American hosts of X. glabratus and suscepts of laurel wilt are members of the family Lauraceae. This comparative study combined field tests and laboratory bioassays to evaluate attraction and boring preferences of female X. glabratus using freshly-cut bolts from nine species of Lauraceae: avocado (one cultivar of each botanical race, redbay, swampbay, silkbay (Persea humilis, California bay laurel (Umbellularia californica, sassafras (Sassafras albidum, northern spicebush (Lindera benzoin, camphor tree (Cinnamomum camphora, and lancewood (Nectandra coriacea. In addition, volatile collections and gas chromatography-mass spectroscopy (GC-MS were conducted to quantify terpenoid emissions from test bolts, and electroantennography (EAG was performed to measure olfactory responses of X. glabratus to terpenoids identified by GC-MS. Significant differences were observed among treatments in both field and laboratory tests. Silkbay and camphor tree attracted the highest numbers of the beetle in the field, and lancewood and spicebush the lowest, whereas boring activity was greatest on silkbay, bay laurel, swampbay, and redbay, and lowest on lancewood, spicebush, and camphor tree. The Guatemalan cultivar of avocado was more attractive than those of the other races, but boring response among the three was equivalent. The results suggest that camphor tree may contain a chemical deterrent to boring, and that different cues are associated with host location and host acceptance. Emissions of α-cubebene, α-copaene, α-humulene, and

  14. North American Lauraceae: terpenoid emissions, relative attraction and boring preferences of redbay ambrosia beetle, Xyleborus glabratus (coleoptera: curculionidae: scolytinae).

    Science.gov (United States)

    Kendra, Paul E; Montgomery, Wayne S; Niogret, Jerome; Pruett, Grechen E; Mayfield, Albert E; MacKenzie, Martin; Deyrup, Mark A; Bauchan, Gary R; Ploetz, Randy C; Epsky, Nancy D

    2014-01-01

    The invasive redbay ambrosia beetle, Xyleborus glabratus, is the primary vector of Raffaelea lauricola, a symbiotic fungus and the etiologic agent of laurel wilt. This lethal disease has caused severe mortality of redbay (Persea borbonia) and swampbay (P. palustris) trees in the southeastern USA, threatens avocado (P. americana) production in Florida, and has potential to impact additional New World species. To date, all North American hosts of X. glabratus and suscepts of laurel wilt are members of the family Lauraceae. This comparative study combined field tests and laboratory bioassays to evaluate attraction and boring preferences of female X. glabratus using freshly-cut bolts from nine species of Lauraceae: avocado (one cultivar of each botanical race), redbay, swampbay, silkbay (Persea humilis), California bay laurel (Umbellularia californica), sassafras (Sassafras albidum), northern spicebush (Lindera benzoin), camphor tree (Cinnamomum camphora), and lancewood (Nectandra coriacea). In addition, volatile collections and gas chromatography-mass spectroscopy (GC-MS) were conducted to quantify terpenoid emissions from test bolts, and electroantennography (EAG) was performed to measure olfactory responses of X. glabratus to terpenoids identified by GC-MS. Significant differences were observed among treatments in both field and laboratory tests. Silkbay and camphor tree attracted the highest numbers of the beetle in the field, and lancewood and spicebush the lowest, whereas boring activity was greatest on silkbay, bay laurel, swampbay, and redbay, and lowest on lancewood, spicebush, and camphor tree. The Guatemalan cultivar of avocado was more attractive than those of the other races, but boring response among the three was equivalent. The results suggest that camphor tree may contain a chemical deterrent to boring, and that different cues are associated with host location and host acceptance. Emissions of α-cubebene, α-copaene, α-humulene, and calamenene were

  15. Respiratory-Gated MRgHIFU in Upper Abdomen Using an MR-Compatible In-Bore Digital Camera

    Directory of Open Access Journals (Sweden)

    Vincent Auboiroux

    2014-01-01

    Full Text Available Objective. To demonstrate the technical feasibility and the potential interest of using a digital optical camera inside the MR magnet bore for monitoring the breathing cycle and subsequently gating the PRFS MR thermometry, MR-ARFI measurement, and MRgHIFU sonication in the upper abdomen. Materials and Methods. A digital camera was reengineered to remove its magnetic parts and was further equipped with a 7 m long USB cable. The system was electromagnetically shielded and operated inside the bore of a closed 3T clinical scanner. Suitable triggers were generated based on real-time motion analysis of the images produced by the camera (resolution 640×480 pixels, 30 fps. Respiratory-gated MR-ARFI prepared MRgHIFU ablation was performed in the kidney and liver of two sheep in vivo, under general anaesthesia and ventilator-driven forced breathing. Results. The optical device demonstrated very good MR compatibility. The current setup permitted the acquisition of motion artefact-free and high resolution MR 2D ARFI and multiplanar interleaved PRFS thermometry (average SNR 30 in liver and 56 in kidney. Microscopic histology indicated precise focal lesions with sharply delineated margins following the respiratory-gated HIFU sonications. Conclusion. The proof-of-concept for respiratory motion management in MRgHIFU using an in-bore digital camera has been validated in vivo.

  16. Development of the phased array ultrasonic testing technique for nuclear power plant's small bore piping socket weld

    International Nuclear Information System (INIS)

    Failure of small bore piping welds is a recurring problem at nuclear power plants. And the socket weld cracking in small bore piping has caused unplanned plant shutdowns for repair and high economic impact on the plants. Consequently, early crack detection, including the detection of manufacturing defects, is of the utmost importance. Until now, the surface inspection methods has been applied according to ASME Section XI requirements. But the ultrasonic inspection as a volumetric method is also applying to enforce the inspection requirement. However, the conventional manual ultrasonic inspection techniques are used to detect service induced fatigue cracks. And there was uncertainty on manual ultrasonic inspection because of limited access to the welds and difficulties with contact between the ultrasonic probe and the OD(outer diameter) surface of small bore piping. In this study, phased array ultrasonic inspection technique is applied to increase inspection speed and reliability. To achieve this object, the 3.5 MHz phased array ultrasonic transducer are designed and fabricated. The manually encoded scanner was also developed to enhance contact conditions and maintain constant signal quality. Additionally inspection system is configured and inspection procedure is developed.

  17. Deformation Compensation of Ram Components of Super-heavy-duty CNC Floor Type Boring and Milling Machine

    Institute of Scientific and Technical Information of China (English)

    WU Fenghe; QIAO Lijun; XU Yaoling

    2012-01-01

    Ram is a very important component of super-heavy-duty computer numerical control (CNC) floor type boring-milling machine,and deformation of ram is a significant source causing errors in machining process.To compensate the deformation error of super-heavy-duty CNC floor type boring-milling machine,based on force analysis theory,the law and compensation measures of deformation of ram are researched.Based on the principle of torque (force) balance of the ram components,the formulas of compensation forces and compensation torques are derived,the relations between compensation forces (compensation torques)and the stroke distance of the ram are given.According to theoretical analysis results and the structural characteristics of super-heavy-duty CNC floor type boring and milling machine of TK6932,rods compensation,hydrostatic pressure compensation and wire rope compensation measures are taken to compensate the deformation error of ram.The experiments and computer simulation results show that the straightness of the ram at its overhanging end meets the national machinery industry standards.

  18. Characterization of the excavation disturbance caused by boring of the experimental full scale deposition holes in the research tunnel at Olkiluoto

    International Nuclear Information System (INIS)

    Three holes, the size of deposition holes, were bored in the research tunnel in Olkiluoto (in Finland) using a novel full-face boring technique. During the boring test procedures were carried out in order to determine the effect of changes in operating parameters on the performance of the boring machine and the quality of the hole. Evaluation of the quality of the hole included studies of the geometry of the holes, measurements of surface roughness using a laser profilometer, rock mechanical determinations and study of excavation disturbances in the zone adjacent to the surface of the holes using two novel methods, the He-gas method and the 14C-polymethylmethacrylate (14C-PMMA) method

  19. Molecular phylogeny and shell microstructure of Fungiacava eilatensis Goreau et al. 1968, boring into mushroom corals (Scleractinia: Fungiidae), in relation to other mussels (Bivalvia: Mytilidae)

    NARCIS (Netherlands)

    Owada, M.; Hoeksema, B.W.

    2011-01-01

    Research on the evolution of the symbiosis between the boring mussel Fungiacava eilatensis (Bivalvia: Mytilidae) and its mushroom coral hosts (Scleractinia: Fungiidae), which requires phylogenetic reconstructions of both the Mytilidae and the Fungiidae, contributes to the understanding of the comple

  20. Commissioning and quality control of a dedicated wide bore 3T MRI simulator for radiotherapy planning

    Directory of Open Access Journals (Sweden)

    Aitang Xing

    2016-06-01

    Full Text Available Purpose: The purpose of this paper is to describe a practical approach to commissioning and quality assurance (QA of a dedicated wide-bore 3 Tesla (3T magnetic resonance imaging (MRI scanner for radiotherapy planning.Methods: A comprehensive commissioning protocol focusing on radiotherapy (RT specific requirements was developed and performed. RT specific tests included: uniformity characteristics of radio-frequency (RF coil, couch top attenuation, geometric distortion, laser and couch movement and an end-to-end radiotherapy treatment planning test. General tests for overall system performance and safety measurements were also performed.Results: The use of pre-scan based intensity correction increased the uniformity from 61.7% to 97% (body flexible coil, from 50% to 90% (large flexible coil and from 51% to 98% (small flexible coil. RT flat top couch decreased signal-to-noise ratio (SNR by an average of 42%. The mean and maximum geometric distortion was found to be 1.25 mm and 4.08 mm for three dimensional (3D corrected image acquisition, 2.07 mm and 7.88 mm for two dimensional (2D corrected image acquisition over 500 mm × 375 mm × 252 mm field of view (FOV. The accuracy of the laser and couch movement was less than ±1 mm. The standard deviation of registration parameters for the end-to-end test was less than 0.41 mm. An on-going QA program was developed to monitor the system’s performance.Conclusion: A number of RT specific tests have been described for commissioning and subsequent performance monitoring of a dedicated MRI simulator (MRI-Sim. These tests have been important in establishing and maintaining its operation for RT planning.

  1. Closed-bore XMR (CBXMR) systems for aortic valve replacement: X-ray tube imaging performance

    Energy Technology Data Exchange (ETDEWEB)

    Bracken, John A.; Komljenovic, Philip; Lillaney, Prasheel V.; Fahrig, Rebecca; Rowlands, J. A. [Department of Medical Biophysics and Sunnybrook Health Sciences Center, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5 (Canada); Department of Radiology, Stanford University, Stanford, California 94305 (United States); Department of Medical Biophysics and Sunnybrook Health Sciences Center, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5 (Canada)

    2009-04-15

    A hybrid closed-bore x-ray/MRI system (CBXMR) is proposed to improve the safety and efficacy of percutaneous aortic valve replacement procedures. In this system, an x-ray C-arm will be positioned about 1 m from the entrance of a 1.5 T MRI scanner. The CBXMR system will harness the complementary strengths of both modalities to guide and deploy a bioprosthetic valve into the aortic annulus of the heart without coronary artery obstruction. A major challenge in constructing this system is ensuring proper operation of a rotating-anode x-ray tube in the MRI magnetic fringe field environment. The electron beam in the x-ray tube responsible for producing x rays can be deflected by the fringe field. However, the clinical impact of electron beam deflection in a magnetic field has not yet been studied. Here, the authors investigated changes in focal spot resolving power, field of view shift, and field of view truncation in x-ray images as a result of electron beam deflection. The authors found that in the fringe field acting on the x-ray tube at the clinical location for the x-ray C-arm (4 mT), focal spot size increased by only 2%, so the fringe field did not limit the resolving power of the x-ray system. The magnetic field also caused the field of view to shift by 3 mm. This shift must be corrected to avoid unnecessary primary radiation exposure to the patient and the staff in the cardiac catheterization laboratory. The fringe field was too weak to cause field of view truncation.

  2. Closed-bore XMR (CBXMR) systems for aortic valve replacement: x-ray tube imaging performance.

    Science.gov (United States)

    Bracken, John A; Komljenovic, Philip; Lillaney, Prasheel V; Fahrig, Rebecca; Rowlands, J A

    2009-04-01

    A hybrid closed-bore x-ray/MRI system (CBXMR) is proposed to improve the safety and efficacy of percutaneous aortic valve replacement procedures. In this system, an x-ray C-arm will be positioned about 1 m from the entrance of a 1.5 T MRI scanner. The CBXMR system will harness the complementary strengths of both modalities to guide and deploy a bioprosthetic valve into the aortic annulus of the heart without coronary artery obstruction. A major challenge in constructing this system is ensuring proper operation of a rotating-anode x-ray tube in the MRI magnetic fringe field environment. The electron beam in the x-ray tube responsible for producing x rays can be deflected by the fringe field. However, the clinical impact of electron beam deflection in a magnetic field has not yet been studied. Here, the authors investigated changes in focal spot resolving power, field of view shift, and field of view truncation in x-ray images as a result of electron beam deflection. The authors found that in the fringe field acting on the x-ray tube at the clinical location for the x-ray C-arm (4 mT), focal spot size increased by only 2%, so the fringe field did not limit the resolving power of the x-ray system. The magnetic field also caused the field of view to shift by 3 mm. This shift must be corrected to avoid unnecessary primary radiation exposure to the patient and the staff in the cardiac catheterization laboratory. The fringe field was too weak to cause field of view truncation. PMID:19472613

  3. Wear Analysis of Disc Cutters of Full Face Rock Tunnel Boring Machine

    Institute of Scientific and Technical Information of China (English)

    ZHANG Zhaohuang; MENG Liang; SUN Fei

    2014-01-01

    Wear is a major factor of disc cutters’ failure. No current theory offers a standard for the prediction of disc cutter wear yet. In the field the wear prediction method commonly used is based on the excavation length of tunnel boring machine(TBM) to predict the disc cutter wear and its wear law, considering the location number of each disc cutter on the cutterhead(radius for installation); in theory, there is a prediction method of using arc wear coefficient. However, the preceding two methods have their own errors, with their accuracy being 40% or so and largely relying on the technicians’ experience. Therefore, radial wear coefficient, axial wear coefficient and trajectory wear coefficient are defined on the basis of the operating characteristics of TBM. With reference to the installation and characteristics of disc cutters, those coefficients are modified according to penetration, which gives rise to the presentation of comprehensive axial wear coefficient, comprehensive radial wear coefficient and comprehensive trajectory wear coefficient. Calculation and determination of wear coefficients are made with consideration of data from a segment of TBM project(excavation length 173 m). The resulting wear coefficient values, after modification, are adopted to predict the disc cutter wear in the follow-up segment of the TBM project(excavation length of 5621 m). The prediction results show that the disc cutter wear predicted with comprehensive radial wear coefficient and comprehensive trajectory wear coefficient are not only accurate(accuracy 16.12%) but also highly congruous, whereas there is a larger deviation in the prediction with comprehensive axial wear coefficient(accuracy 41%, which is in agreement with the prediction of disc cutters’ life in the field). This paper puts forth a new method concerning prediction of life span and wear of TBM disc cutters as well as timing for replacing disc cutters.

  4. Horizontal stresses from well-bore breakouts and lithologies associated with their formation, Oklahoma and Texas Panhandle

    Science.gov (United States)

    Dart, Richard L.

    1989-01-01

    Orientations of crustal stresses are inferred from stress-induced well-bore breakouts in three areas in the south-central United States: the eastern part of the Anadarko basin in central Oklahoma, the Marietta basin in south-central Oklahoma, and the Bravo dome area of the central Texas Panhandle. Inferred directions of maximum horizontal principal stress (SHmax) are ENE for the eastern Anadarko basin, and NE for the Marietta basin and the Bravo dome area. For the Bravo dome area, the magnitudes of the three principal stresses (S1, S2, S3) are known from existing hydraulic-fracturing (hydrofrac) measurements, and a normal-faulting stress regime (SV > SHmax > SHmin) is implied. For the eastern Anadarko basin and the Marietta basin, the magnitudes of the principal stresses are not known. Because Quaternary left-lateral oblique slip on the Meers fault in south-central Oklahoma suggests strike-slip (SHmax > Sv > SHmin) and reverse faulting (SHmax > SHmin > SV), the study region is inferred to be a possible transition zone between areas of extensional and compressional stresses. Breakout data from the eastern Anadarko basin yield a single consistent SHmax orientation. Data from the Marietta basin and the Bravo dome area have bimodal-orthogonal distributions consisting of breakouts and orthogonal sets of well-bore enlargement orientations. Orthogonal trends in the data are probably related to drilling-induced hydraulic fracturing of the well bore, or to preexisting natural fractures or joint sets intersecting the well bore. On the dipmeter log, breakouts and fracture enlargements have elliptical cross sections of similar size and shape. Orthogonally oriented well-bore enlargements are differentiated by comparing their long-axis orientations with directions of known or inferred horizontal stress. Dispersion, or data scatter, among enlargement orientations (bimodal data sets) increases the standard deviations for many well data sets from the Marietta basin and the Bravo

  5. Interpretation of Geological Correlation Borings 1, 2, 3 in the A/M Area of the Savannah River Site, South Carolina

    Energy Technology Data Exchange (ETDEWEB)

    Wyatt, D.E. [Westinghouse Savannah River Company, AIKEN, SC (United States); Cumbest, R.J.; Aadland, R.K.; Syms, F.H.; Stephenson, D.E.; Sherrill, J.C.

    1997-06-01

    The Geophysical Correlation Boring (GCB) Program was organized to provide a comprehensive correlation capability between geological core and advanced borehole geophysical data, surface high resolution reflection seismic information and, when available, borehole geochemical and cone penetrometer data. This report provides results and initial geological interpretations of borings one, two, and three (GCB-1, GCB-2, GCB-3) located within the Upper Three Runs Watershed (A/M Area) of the Savannah River Site.

  6. Interpretation of Geological Correlation Borings 1, 2, 3 in the A/M Area of the Savannah River Site, South Carolina

    International Nuclear Information System (INIS)

    The Geophysical Correlation Boring (GCB) Program was organized to provide a comprehensive correlation capability between geological core and advanced borehole geophysical data, surface high resolution reflection seismic information and, when available, borehole geochemical and cone penetrometer data. This report provides results and initial geological interpretations of borings one, two, and three (GCB-1, GCB-2, GCB-3) located within the Upper Three Runs Watershed (A/M Area) of the Savannah River Site

  7. The use of a Tunnel Boring Machine (TBM) as a seismic source

    Science.gov (United States)

    Kreutzer, Ingrid; Chwatal, Werner; Radinger, Alexander; Brückl, Ewald

    2014-05-01

    The Tunnel Seismic While Drilling (TSWD) method uses the Tunnel Boring Machine (TBM) as the seismic source. The method has been developed to predict the geological situation from reflections ahead of the tunnel face without disturbing the tunneling. The vibrations of the TBM are continuously monitored near the drilling head (pilot signal) as well as the direct and reflected seismic wave field at borehole geophones (geophone signal) situated in the tunnel wall behind the TBM. During the processing these signals are correlated and result in excellent seismic traces comparable to conventional seismic methods. The interpretation of the reflections leads to a nearly daily prognosis about 100 m ahead of the TBM. This system was successfully implemented at three different construction sites in Austria and is currently operating at one further. The cutters on front of the TBM head are pressed against the tunnel face and split the rock during rotating which is called the chipping process. This cutting process generates seismic waves radiated into the rock mass and results also in vibrations of the TBM itself. On the one hand it is important to know the source mechanism of the TBM and the radiation pattern of the seismic waves in all directions. Until now this is not well understood. To investigate this 3C-geophones were installed at the surface above the tunnel axis at different construction sites. The obtained seismograms show the forward and backward radiated seismic wave field of the TBM, for the present without consideration of the influence of the free surface. We compare this data with modelled seismograms in which we use different possible source mechanism, like single force or force due to tensile cracks. First results are shown in the scope of this work. On the other hand it is essential to know how good the recorded pilot signal represents the entire chipping process. Due to technically reasons the pilot signal has been registered so far on the non-rotating part

  8. Electro-Pulse-Boring (EPB):Novel Super-Deep Drilling Technology for Low Cost Electricity

    Institute of Scientific and Technical Information of China (English)

    Hans O.Schiegg; Arild Rdland; Guizhi Zhu; David A Yuen

    2015-01-01

    The inexhaustible heat deposit in great depths (5–10 km) is a scientific fact. Such deposit occurs around the globe. Thereby, everybody is enabled to generate autonomously clean and renew-able energy, ample electricity and heat. The economical exploration and exploitation of this super-deep geothermal heat deposit requires a novel drilling technique, because the currently only deep drilling method (Rotary) is limited to about 5 km, due to the rising costs, depending exponentially on depth. Electro-pulse-boring (EPB) is a valuable option to Rotary drilling. EPB, originally investigated in Russia, is ready to be developed for industrialization. The feasibility of EPB is proven by many boreholes drilled up to 200 m in granite (crystalline). Estimates show outstanding low costs for drilling by EPB: 100€/m for a borehole with a large diameter (Ø) such as 20"(50 cm), independent on depth and applicable likewise for sediments and crystalline rocks, such as granite. The current rate of pene-tration (ROP) of 3 m per hour is planned to be augmented up to 35 m per hour, and again, irrespec-tive whether in sedimentary or crystalline formations. Consequently, a 10 km deep borehole with Ø 50 cm will ultimately be drilled within 12 days. EPB will create new markets, such as: (i) EPB shallow drilling for geotechnics, energy piles, measures in order to mitigate natural hazards, etc., (ii) EPB deep drilling (3–5 km) for hydro-geothermics, exploration campaigns etc. and (iii) EPB super-deep drilling (5–10 km) for petro-geothermics, enabling the economic generation of electricity. The autonomous and unlimited supply with cost efficient electricity, besides ample heat, ensures reliably clean and renew-able energy, thus, high supply security. Such development will provide a substantial relief to cope with the global challenge to limit the climate change below 2 ºC. The diminution of fossil fuels, due to the energy transition in order to mitigate the climate change, implies

  9. Anatomical study on Myoforceps aristatus, an invasive boring bivalve in S.E. Brazilian coast (Mytilidae

    Directory of Open Access Journals (Sweden)

    Luiz Ricardo L. Simone

    2006-01-01

    Full Text Available The bivalve Myoforceps aristatus (Dillwyn, 1817, also known as Lithophaga aristata, have been recently collected in the coasts of Rio de Janeiro and São Paulo, Brazil; a species that bores shells of other mollusks. This occurrence has been interpreted as an invasion of this species, originally from the Caribbean. The distinguishing character of the species is the posterior extensions of the shell crossing with each other. Because specimens with this character have also been collected in the Pacific Ocean, they all have been considered a single species. However, it is possible that more than one species may be involved in such worldwide distribution. With the objective of providing full information based on Atlantic specimens, a complete anatomical description is provided, which can be used in comparative studies with specimens from other oceans. Additional distinctive features of M. aristatus are the complexity of the incurrent siphon, the kidney opening widely into the supra-branchial chamber (instead of via a nephropore, and the multi-lobed auricle.O bivalve Myoforceps aristatus (Dillwyn, 1817, também conhecido como Lithophaga aristata, tem sido recentemente coletado nas costas do Rio de Janeiro e São Paulo, Brasil; uma espécie que perfura conchas de outros moluscos. Esta ocorrência está sendo interpretada como uma invasão de uma espécie originada do Caribe. O caráter distintivo da espécie é a região posterior da concha, com extensões que se cruzam. Como espécimes com esta característica também têm sido coletados no oceano Pacífico, eles tem sido considerados como pertencentes à mesma espécie. Entretanto, é possível que mais de uma espécie possam estar envolvidas nesta suposta distribuição mundial. Com o objetivo de fornecer informação completa baseada em material do Atlântico, uma descrição anatômica completa é dada, a qual pode ser usada em estudos comparativos com espécimes de outros oceanos. As caracter

  10. Caldecott 4th bore tunnel project: influence of ground water flows and inflows triggered by tectonic fault zones?

    Science.gov (United States)

    Neuhuber, G.; G. Neuhuber1, W. Klary1, A. Nitschke1, B. Thapa2, Chris Risden3, T. Crampton4, D. Zerga5

    2011-12-01

    The 4th Bore is a highway tunnel on California State Route 24 currently under construction. The 4th Bore is undertaken by the California State Department of Transportation (CALTRANS) and the Contra Costa County Transportation Commission (CCTC) to alleviate traffic congestion on SR24 connecting the cities of Oakland and Orinda in the San Francisco East Bay Area. The cost for the 4th Bore is estimated at $ 390.8 Mill. The 3,249 ft long 4th Bore tunnel will have excavated dimensions of approximately 40 ft height and 49 ft width. A total of 7 cross passages will run between the 3rd and the new 4th bore. Geology and Hydrogeology: The project is located in the Oakland Berkeley Hills of the SF Bay Area. The Caldecott Tunnels lie within the easterly assemblage of the Hayward fault zone province which consists of a sequence of sedimentary and volcanic rocks that accumulated in the interval between about 16 and 8.4 Ma (Miocene). The basal rocks of these Tertiary deposits consist of deep marine basin sediments of the Monterey Group. These rocks are overlain uncomfortably by an interbedded sequence of terrestrial sediments (Orinda Formation) and volcanic rocks (Moraga Formation). The Tertiary rocks have been folded into large amplitude, NW trending folds that are cut by N trending strike and slip faults. The SF Bay Region, which is crossed by 4 major faults (San Gregorio, San Andreas, Hayward, and Calaveras), is considered one of the more seismically active regions of the world. The active Hayward fault lies 0.9mi to the west of the Caldecott Tunnels and is the closest major fault to the project area. The tunnel is at the moment under top heading construction: West Portal (360ft) and East Portal (1,968.5ft). While major faults typically influence groundwater flow, characterization of such influences is extremely difficult because of the heterogeneity of the hydraulic systems and the different lithological parameters and influences. Four major inactive fault zones striking

  11. Design, Fabrication and Initial Testing of a Large Bore Single Aperture 1 m Long Superconducting Dipole Made with Phenolic Inserts

    CERN Document Server

    Boschmann, H; Kirby, G A; Lucas, J; Ostojic, R; Russenschuck, Stephan; Siemko, A; Vanenkov, I; Weterings, W

    1997-01-01

    In the framework of the LHC magnet development programme, a large bore single aperture 1-meter long superconducting dipole has been built in collaboration with HOLEC. The magnet features a single layer coil wound using the LHC main dipole outer layer cable, phenolic inserts, and a keyed two part structural iron yoke. This paper presents the magnetic and mechanical design and optimisation of the magnet. We describe the coil winding and curing, and present the construction and assembly procedures. Finally we report on the mechanical behaviour during assembly and cooling, and present the magnet training behaviour.

  12. Simultaneous effect of organic modifier and physicochemical parameters of barbiturates on their retention on a narrow-bore PGC column.

    Science.gov (United States)

    Forgács, Esther; Cserháti, Tibor; Miksik, Ivan; Echardt, Adam; Deyl, Zdenek

    2004-02-01

    The retention time of 22 barbituric acid derivatives was measured on a narrow-bore porous graphitized carbon (PGC) column using water-dioxane mixtures as mobile phases. The capacity factor (k), theoretical plate number (N), and asymmetry factor (AF) were calculated for each solute in each mobile phase. The relationships between chromatographic characteristics and physicochemical parameters of solutes were elucidated by stepwise regression analysis (SRA). SRA indicated that the binding of barbiturates to the PGC surface is of mixed character electrostatic and apolar interactive forces are equally involved. Sterical correspondence between the surface of the stationary phase and the solutes also exert a significant influence on the retention behavior. PMID:14698263

  13. TEST RESULTS OF 60-cm BORE Nb3Sn TEST MODULE COIL (TMC-I) IN THE CLUSTER TEST FACILITY

    OpenAIRE

    Ando, T; Shimamoto, S.; T. Hiyama; Tsuji, H; Takahashi, Y.; Nishi, M; Tada, E.; Yoshida, K; Okuno, K.; Koizurmi, K.; Kato, T.; Nakajima, H; Takahashi, O; Oshikiri, M.; Yasukochi, K.

    1984-01-01

    An extended test of a 60-cm-bore Nb3Sn coil (TMC-I), constructed as a development of superconducting toroidal coil in tokamak machine, has been carried out in the cluster test facility. A 192-cm-length (one turn) normal zone, nucleated by a heat-input in the innermost turn, is recovered to superconducting state at 6 kA and 10 T. For the manual dump with a decay time constant of 6.6 sec (B = 1.0 T/sec), no damage is found on the TMC-I. In addition, a out-of-plane force mode operation, using on...

  14. Electron contamination modeling and reduction in a 1 T open bore inline MRI-linac system

    Energy Technology Data Exchange (ETDEWEB)

    Oborn, B. M. [Illawarra Cancer Care Centre (ICCC), Wollongong, NSW 2500, Australia and Centre for Medical Radiation Physics (CMRP), University of Wollongong, Wollongong, NSW 2500 (Australia); Kolling, S. [Sydney Medical School, University of Sydney, NSW 2006 (Australia); Metcalfe, P. E. [Centre for Medical Radiation Physics (CMRP), University of Wollongong, Wollongong, NSW 2500, Australia and Ingham Institute for Applied Medical Research, Liverpool, NSW 2170 (Australia); Crozier, S. [School of Information Technology and Electric Engineering, University of Queensland, QLD 4072 (Australia); Litzenberg, D. W. [Department of Radiation Oncology, University of Michigan Hospital and Health Systems, Ann Arbor, Michigan 48109 (United States); Keall, P. J. [Sydney Medical School, University of Sydney, NSW 2006, Australia and Ingham Institute for Applied Medical Research, Liverpool, NSW 2170 (Australia)

    2014-05-15

    Purpose: A potential side effect of inline MRI-linac systems is electron contamination focusing causing a high skin dose. In this work, the authors reexamine this prediction for an open bore 1 T MRI system being constructed for the Australian MRI-Linac Program. The efficiency of an electron contamination deflector (ECD) in purging electron contamination from the linac head is modeled, as well as the impact of a helium gas region between the deflector and phantom surface for lowering the amount of air-generated contamination. Methods: Magnetic modeling of the 1 T MRI was used to generate 3D magnetic field maps both with and without the presence of an ECD located immediately below the MLC’s. Forty-seven different ECD designs were modeled and for each the magnetic field map was imported into Geant4 Monte Carlo simulations including the linac head, ECD, and a 30 × 30 × 30 cm{sup 3} water phantom located at isocenter. For the first generation system, the x-ray source to isocenter distance (SID) will be 160 cm, resulting in an 81.2 cm long air gap from the base of the ECD to the phantom surface. The first 71.2 cm was modeled as air or helium gas, with the latter encased between two windows of 50 μm thick high density polyethlyene. 2D skin doses (at 70 μm depth) were calculated across the phantom surface at 1 × 1 mm{sup 2} resolution for 6 MV beams of field size of 5 × 5, 10 × 10, and 20 × 20 cm{sup 2}. Results: The skin dose was predicted to be of similar magnitude as the generic systems modeled in previous work, 230% to 1400% ofD {sub max} for 5 × 5 to 20 × 20 cm{sup 2}, respectively. Inclusion of the ECD introduced a nonuniformity to the MRI imaging field that ranged from ∼20 to ∼140 ppm while the net force acting on the ECD ranged from ∼151 N to ∼1773 N. Various ECD designs were 100% efficient at purging the electron contamination into the ECD magnet banks; however, a small percentage were scattered back into the beam and continued to the phantom

  15. Tunnel Boring Machine Cutter Maintenance for Constructing Underground Cable Lines from Nuclear Power Plants

    International Nuclear Information System (INIS)

    The tunnel boring machine (TBM) can construct an underground tunnel efficiently and without construction noise vibration related problems. Many civil projects, such as NPP construction, set importance on the economics of construction. Thus, advance rate, which is the speed at which the TBM is able to progress along its intended route, is one of the key factors affecting construction period and construction expenses. As the saying goes, time is money. Right Double Quotation Mark In addition, it is important to manage construction permits and civil complaints, even when construction expenses and construction periods are excluded. So, accurate prediction for advance rate is important when designing tunnel project. Several designers and project owners have tried to improve construction efficiency and tunneling advance rate.. There have been several studies on managing the rate of wear, designing an optimum tunnel face, and finding the optimum cutter spacing. Cutter replacements due to cutter wear and tear are very important because the wear and tear of cutters attached to the cutter head profoundly affect the advance rate. To manage cutter wear and tear is to control parameters related to cutter shape and cutter wear rate. There have been studies on the relationship between rock properties or TBM characteristics, and cutter wear or replacement. However, many of these studies relied on computer simulations or other small scale experiments. Therefore, this paper attempts to present a correlation between cutter replacement or cutter wear, against various parameters using practical data such as rock quality and TBM shield specifications, from an actual construction site. This study was conducted to suggest directions in the improvement of TBM cutters by analyzing relationships between rock conditions and cutter maintenance as well as TBM advance rates. Actual field data was collected and compared to actual design values in evaluating the effectiveness of traditional

  16. Tunnel Boring Machine Cutter Maintenance for Constructing Underground Cable Lines from Nuclear Power Plants

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Jae Wang; Yee, Eric [KEPCO International Nuclear Graduate School, Ulsan (Korea, Republic of)

    2014-10-15

    The tunnel boring machine (TBM) can construct an underground tunnel efficiently and without construction noise vibration related problems. Many civil projects, such as NPP construction, set importance on the economics of construction. Thus, advance rate, which is the speed at which the TBM is able to progress along its intended route, is one of the key factors affecting construction period and construction expenses. As the saying goes, time is money. Right Double Quotation Mark In addition, it is important to manage construction permits and civil complaints, even when construction expenses and construction periods are excluded. So, accurate prediction for advance rate is important when designing tunnel project. Several designers and project owners have tried to improve construction efficiency and tunneling advance rate.. There have been several studies on managing the rate of wear, designing an optimum tunnel face, and finding the optimum cutter spacing. Cutter replacements due to cutter wear and tear are very important because the wear and tear of cutters attached to the cutter head profoundly affect the advance rate. To manage cutter wear and tear is to control parameters related to cutter shape and cutter wear rate. There have been studies on the relationship between rock properties or TBM characteristics, and cutter wear or replacement. However, many of these studies relied on computer simulations or other small scale experiments. Therefore, this paper attempts to present a correlation between cutter replacement or cutter wear, against various parameters using practical data such as rock quality and TBM shield specifications, from an actual construction site. This study was conducted to suggest directions in the improvement of TBM cutters by analyzing relationships between rock conditions and cutter maintenance as well as TBM advance rates. Actual field data was collected and compared to actual design values in evaluating the effectiveness of traditional

  17. Analysis of hydrological trend for radioactivity content in bore-hole water samples using wavelet based denoising

    International Nuclear Information System (INIS)

    A wavelet transform based denoising methodology has been applied to detect the presence of any discernable trend in 137Cs and 90Sr activity levels in bore-hole water samples collected four times a year over a period of eight years, from 2002 to 2009, in the vicinity of typical nuclear facilities inside the restricted access zones. The conventional non-parametric methods viz., Mann–Kendall and Spearman rho, along with linear regression when applied for detecting the linear trend in the time series data do not yield results conclusive for trend detection with a confidence of 95% for most of the samples. The stationary wavelet based hard thresholding data pruning method with Haar as the analyzing wavelet was applied to remove the noise present in the same data. Results indicate that confidence interval of the established trend has significantly improved after pre-processing to more than 98% compared to the conventional non-parametric methods when applied to direct measurements. -- Highlights: ► Environmental trend analysis with wavelet pre-processing was carried out. ► Removal of local fluctuations to obtain the trend in a time series with various mother wavelets. ► Theoretical validation of the methodology with model outputs. ► Efficient detection of trend for 137Cs, 90Sr in bore-hole water samples improves the associated confidence interval to more than 98%. ► Wavelet based pre-processing reduces the indecisive nature of the detected trend

  18. MR-guided liver biopsy within a short, wide-bore 1.5 Tesla MR system

    International Nuclear Information System (INIS)

    The purpose of this study was to evaluate the diagnostic efficacy of magnetic resonance (MR)-guided biopsy of focal liver lesions within a short, wide-bore 1.5-T MR system and to determine the duration and accuracy of needle placement using MR fluoroscopy guidance in 25 patients. Accuracy of needle placement was evaluated in two orthogonal planes, and the out-of-plane angle of needle deflection was measured. Needle positioning was characterised subjectively as centred, peripheral, or exterior relative to the lesion. Exterior positioning was corrected by a step-by-step procedure. Surgical resection (n = 6), previous histologies (n = 8), or clinical/radiological follow-up (n = 11) served as the 'gold standard'. The guidance needle could be placed successfully using MR fluoroscopy in 20 of 25 patients (80%). Needle placement was rated as 'centred' in 11 and as 'peripheral' in nine patients. Median needle deflection was 2.6 degrees, with a median deviation of 3.4 mm. In five patients, the direct approach failed or was rated as 'exterior'; therefore, repositioning after needle stabilisation with a stainless-steel stylet was necessary. The diagnostic yield of all biopsies was: sensitivity 95.5%, specificity 100.0% and accuracy 96.0%. In conclusion, MR-guided biopsies in a short, wide-bore MR system yielded highly reliable biopsy results, and in most cases the direct approach with MR fluoroscopy guidance proved to be fast and accurate. (orig.)

  19. New Rock Abrasivity Test Method for Tool Life Assessments on Hard Rock Tunnel Boring: The Rolling Indentation Abrasion Test (RIAT)

    Science.gov (United States)

    Macias, F. J.; Dahl, F.; Bruland, A.

    2016-05-01

    The tunnel boring machine (TBM) method has become widely used and is currently an important presence within the tunnelling industry. Large investments and high geological risk are involved using TBMs, and disc cutter consumption has a great influence on performance and cost, especially in hard rock conditions. Furthermore, reliable cutter life assessments facilitate the control of risk as well as avoiding delays and budget overruns. Since abrasive wear is the most common process affecting cutter consumption, good laboratory tests for rock abrasivity assessments are needed. A new abrasivity test method by rolling disc named Rolling Indentation Abrasion Test (RIAT) has been developed. The goal of the new test design and procedure is to reproduce wear behaviour on hard rock tunnel boring in a more realistic way than the traditionally used methods. Wear by rolling contact on intact rock samples is introduced and several rock types, covering a wide rock abrasiveness range, have been tested by RIAT. The RIAT procedure indicates a great ability of the testing method to assess abrasive wear on rolling discs. In addition and to evaluate the newly developed RIAT test method, a comprehensive laboratory testing programme including the most commonly used abrasivity test methods and the mineral composition were carried out. Relationships between the achieved results from conventional testing and RIAT results have been analysed.

  20. Application of High-Pressure Cold Spray for an Internal Bore Repair of a Navy Valve Actuator

    Science.gov (United States)

    Widener, C. A.; Carter, M. J.; Ozdemir, O. C.; Hrabe, R. H.; Hoiland, B.; Stamey, T. E.; Champagne, V. K.; Eden, T. J.

    2016-01-01

    Cold spray is a reduced temperature, supersonic thermal spray process that is increasingly being used to perform repairs on high-value components. In this case, a valve actuator internal bore sealing surface was repaired on an aluminum 6061 hydraulic valve body using high-pressure cold spray. Corrosion damage to non-critical surfaces was also repaired, allowing the part to be returned to service. A high-pressure cold spray system was used to deposit gas-atomized 6061 aluminum powder using helium. The internal bore surfaces were approximately 100 mm in diameter with a depth of nearly 200 mm, and were sprayed using a 45° nozzle 65 mm in length. Modeling predictions validated the approach, and were used to identify a favorable nozzle geometry and process window combination. The minimum required adhesion strength on critical surfaces was 69 MPa. The average adhesion strength was 71.4 MPa, with glue failures on ASTM C633 bond test specimens. The actuator subsequently passed all bench top service related testing, was qualified as an approved repair, and is now in service. This was a first of its kind repair for cold spray, and demonstrates that it is a viable repair technology and is ready for broader implementation.

  1. Seismically induced soft-sediment deformation structures revealed by X-ray computed tomography of boring cores

    Science.gov (United States)

    Nakashima, Yoshito; Komatsubara, Junko

    2016-06-01

    X-ray computed tomography (CT) allows us to visualize three-dimensional structures hidden in boring cores nondestructively. We applied medical X-ray CT to cores containing seismically induced soft-sediment deformation structures (SSDSs) obtained from the Kanto region of Japan, where the 2011 off the Pacific coast of Tohoku Earthquake occurred. The CT images obtained clearly revealed various types of the seismically induced SSDSs embedded in the cores: a propagating sand dyke bent complexly by the preexisting geological structure, deformed laminations of fluidized sandy layers, and two types of downward mass movement (ductile downward folding and brittle normal faulting) as compensation for upward sand transport through sand dykes. Two advanced image analysis techniques were applied to the sand dyke CT images for the first time. The GrowCut algorithm, a specific digital image segmentation technique that uses cellular automata, was used successfully to extract the three-dimensional complex sand dyke structures embedded in the sandy sediments, which would have been difficult to achieve using a conventional image processing technique. Local autocorrelation image analysis was performed to detect the flow pattern aligned along the sand dykes objectively. The results demonstrate that X-ray CT coupled with advanced digital image analysis techniques is a promising approach to studying the seismically induced SSDSs in boring cores.

  2. Test with different stress measurement methods in two orthogonal bore holes in Aespoe HRL

    International Nuclear Information System (INIS)

    have been drawn, based on the stress measurements and deeper investigations: The following stress state is obtained at the target volume at about -455 m. The minimum horizontal stress is between 10 and 13 MPa, which is lower than the theoretical vertical stress. The maximum horizontal stress is 24 ±5 MPa, most likely within the upper range. The vertical stress is between 15 and 20 MPa, most probably is this value only local due to the presence of a nearby fracture. The local disturbance of the stress field in the rock mass, due to discontinuities has been demonstrated. This also indicates one of the problems with stress measurements in boreholes. In the area with significant anisotropic stress conditions all the tested methods were able to determine the orientation of the principal major horizontal stress within ± 10 deg. The microscopy investigations confirm two sets of microcracks in the overcored core. One set was parallel and near the bore hole bottom and one set was perpendicular to the bottom and located a bit away from the hole bottom. The results from the overcoring may be influenced by microcracks, causing additional non-elastic strains. Only the results from the DDGS seem to have been influenced, indicating that the hollow cylinder of a 3D stress cell may be less sensitive for stress induced sample disturbance than core samples from the 2D Door stopper cell. The determination of Young's modulus in a medium grained crystalline rock with heterogeneity may not be trivial using core samples. The results from the determination influence the calculated stresses. Hydraulic fracturing most likely measures the most correct value of the minimum horizontal stress, provided that the induced fracture is aligned with the borehole. If the rock behaves reasonable elastic the overcoring methods provide stress magnitudes with an uncertainty of 15-20%. It seems likely that the overcoring methods may overestimate the stress magnitudes at large depth, due to the influence of

  3. Deep bore well water level fluctuations in the Koyna region, India: the presence of a low order dynamical system in a seismically active environment

    Directory of Open Access Journals (Sweden)

    D. V. Ramana

    2009-05-01

    Full Text Available Water level fluctuations in deep bore wells in the vicinity of seismically active Koyna region in western India provides an opportunity to understand the causative mechanism underlying reservoir-triggered earthquakes. As the crustal porous rocks behave nonlinearly, their characteristics can be obtained by analysing water level fluctuations, which reflect an integrated response of the medium. A Fractal dimension is one such measure of nonlinear characteristics of porous rock as observed in water level data from the Koyna region. It is inferred in our study that a low nonlinear dynamical system with three variables can predict the water level fluctuations in bore wells.

  4. The Nolans Bore rare-earth element-phosphorus-uranium mineral system: geology, origin and post-depositional modifications

    Science.gov (United States)

    Huston, David L.; Maas, Roland; Cross, Andrew; Hussey, Kelvin J.; Mernagh, Terrence P.; Fraser, Geoff; Champion, David C.

    2016-08-01

    Nolans Bore is a rare-earth element (REE)-U-P fluorapatite vein deposit hosted mostly by the ~1805 Ma Boothby Orthogneiss in the Aileron Province, Northern Territory, Australia. The fluorapatite veins are complex, with two stages: (1) massive to granular fluorapatite with inclusions of REE silicates, phosphates and (fluoro)carbonates, and (2) calcite-allanite with accessory REE-bearing phosphate and (fluoro)carbonate minerals that vein and brecciate the earlier stage. The veins are locally accompanied by narrow skarn-like (garnet-diopside-amphibole) wall rock alteration zones. SHRIMP Th-Pb analyses of allanite yielded an age of 1525 ± 18 Ma, interpreted as the minimum age of mineralisation. The maximum age is provided by a ~1550 Ma SHRIMP U-Pb age for a pegmatite that predates the fluorapatite veins. Other isotopic systems yielded ages from ~1443 to ~345 Ma, implying significant post-depositional isotopic disturbance. Calculation of initial ɛNd and 87Sr/86Sr at 1525 Ma and stable isotope data are consistent with an enriched mantle or lower crust source, although post-depositional disturbance is likely. Processes leading to formation of Nolans Bore began with north-dipping subduction along the south margin of the Aileron Province at 1820-1750 Ma, producing a metasomatised, volatile-rich, lithospheric mantle wedge. About 200 million years later, near the end of the Chewings Orogeny, this reservoir and/or the lower crust sourced alkaline low-degree partial melts which passed into the mid- and upper-crust. Fluids derived from these melts, which may have included phosphatic melts, eventually deposited the Nolans Bore fluorapatite veins due to fluid-rock interaction, cooling, depressurisation and/or fluid mixing. Owing to its size and high concentration of Th (2500 ppm), in situ radiogenic heating caused significant recrystallisation and isotopic resetting. The system finally cooled below 300 °C at ~370 Ma, possibly in response to unroofing during the Alice Springs

  5. The Nolans Bore rare-earth element-phosphorus-uranium mineral system: geology, origin and post-depositional modifications

    Science.gov (United States)

    Huston, David L.; Maas, Roland; Cross, Andrew; Hussey, Kelvin J.; Mernagh, Terrence P.; Fraser, Geoff; Champion, David C.

    2016-01-01

    Nolans Bore is a rare-earth element (REE)-U-P fluorapatite vein deposit hosted mostly by the ~1805 Ma Boothby Orthogneiss in the Aileron Province, Northern Territory, Australia. The fluorapatite veins are complex, with two stages: (1) massive to granular fluorapatite with inclusions of REE silicates, phosphates and (fluoro)carbonates, and (2) calcite-allanite with accessory REE-bearing phosphate and (fluoro)carbonate minerals that vein and brecciate the earlier stage. The veins are locally accompanied by narrow skarn-like (garnet-diopside-amphibole) wall rock alteration zones. SHRIMP Th-Pb analyses of allanite yielded an age of 1525 ± 18 Ma, interpreted as the minimum age of mineralisation. The maximum age is provided by a ~1550 Ma SHRIMP U-Pb age for a pegmatite that predates the fluorapatite veins. Other isotopic systems yielded ages from ~1443 to ~345 Ma, implying significant post-depositional isotopic disturbance. Calculation of initial ɛNd and 87Sr/86Sr at 1525 Ma and stable isotope data are consistent with an enriched mantle or lower crust source, although post-depositional disturbance is likely. Processes leading to formation of Nolans Bore began with north-dipping subduction along the south margin of the Aileron Province at 1820-1750 Ma, producing a metasomatised, volatile-rich, lithospheric mantle wedge. About 200 million years later, near the end of the Chewings Orogeny, this reservoir and/or the lower crust sourced alkaline low-degree partial melts which passed into the mid- and upper-crust. Fluids derived from these melts, which may have included phosphatic melts, eventually deposited the Nolans Bore fluorapatite veins due to fluid-rock interaction, cooling, depressurisation and/or fluid mixing. Owing to its size and high concentration of Th (2500 ppm), in situ radiogenic heating caused significant recrystallisation and isotopic resetting. The system finally cooled below 300 °C at ~370 Ma, possibly in response to unroofing during the Alice Springs

  6. Test results of HD2, a high field Nb$_{3}$Sn dipole with a 36 mm bore

    CERN Document Server

    Ferracin, P

    2009-01-01

    The Superconducting Magnet Program at Lawrence Berkeley National Laboratory (LBNL) has developed the 1 m long Nb3Sn dipole magnet HD2. With tilted (flared) ends to avoid obstructing a 36 mm clear bore, HD2 represents a step towards the use of block-type coils in high-field accelerator magnets. The coil design has been optimized to minimize geometric harmonics and reduce the conductor peak field in the end region, resulting in an expected short sample dipole field of 15 T. The support structure is composed by an external aluminum shell pretensioned with pressurized bladders and interference keys, and by two stainless steel end plates compressing the coil ends through four aluminum axial rods. We report on magnet design, assembly, and test results, including training performance, quench locations, and strain gauge measurements

  7. Refined stratigraphy and facies of the Lower and Middle Bunter sandstone formation in the Remlingen 5 bore hole

    International Nuclear Information System (INIS)

    The Remlingen 5 well was carried down from September 1983 to May 1984 in order to obtain better data on underground rock formation at this site which is at the southern border of the Asse salt anticline, with the coordinates R=44 08 717, H=57 77 743. The bore hole cut across strata of the Lower and Middle Bunter at a depth of 1676.5 m and 2071.5 m. This experiment at Remlingen 5 is the only site in North Germany where the Bunter sandstone was completely cored, and where numerous geophysical measurements could be made. With the available cores and logs, the Lower and Middle Bunter's fine stratigraphy was established and the depositional environments of the different strata were defined. (orig./HP)

  8. Spectrum Gamma Ray bore hole logging while tripping with the sea floor drill rig MARUM-MeBo

    Science.gov (United States)

    Freudenthal, Tim; Steinke, Stephan; Mohtadi, Mahyar; Hebbeln, Dierk; Wefer, Gerold

    2013-04-01

    The robotic Sea Floor Drill Rig MARUM-MeBo developed at the MARUM Center for Marine Environmental Sciences at the University of Bremen was used to retrieve long sediment cores at two sites in the northern South China Sea. Both sites are located in about 1000 m water depth in southeasterly and southwesterly direction of the Pearl River mouth, respectively. South East Asian Monsoon variability controls terrigenous material transport by rivers into the South China Sea. The Pearl River is one of the largest rivers of the region that discharges into the northern South China Sea. The terrigenous fraction of marine sediments of the northern South China Sea therefore provides an excellent archive for reconstructing past variability of the South East Asian Monsoon system. In analogy to the drilling strategy within the Integrated Ocean Drilling Program IODP multiple holes were drilled in order to generate continuous spliced records at both sites. Overall the MARUM-MeBo drilled 374 m during 5 deployments with a maximum drilling depth of 80.85 m and an average core recovery of 94 %. Here we present first results of bore hole logging conducted during 4 of the 5 deployments with a spectrum gamma ray (SGR) probe adapted for the use with MARUM-MeBo. This probe is an autonomous slim hole probe that is used in the logging while tripping mode. This method is especially favorable for remote controlled drilling and logging operation. The probe is equipped with its own energy source and data storage. The probe is lowered into the drill string after the target wire-line coring depth is reached and after the last inner core barrel has been retrieved. When the probe has landed on the shoulder ring at the bottom of the hole, the drill string is pulled out and disassembled. The probe, while being raised with the drill string, continuously measures the geophysical properties of the in situ sediments and rocks. Since the bore hole is stabilized during the tripping process by the drill string

  9. Assembly And Test Of A 120 MM Bore 15 T Nb3Sn Quadrupole For The LHC Upgrade

    International Nuclear Information System (INIS)

    In support of the Large Hadron Collider (LHC) luminosity upgrade, the US LHC Accelerator Research Program (LARP) has been developing a 1-meter long, 120 mm bore Nb3Sn IR quadrupole magnet (HQ). With a design short sample gradient of 219 T/m at 1.9 K and a peak field approaching 15 T, one of the main challenges of this magnet is to provide appropriate mechanical support to the coils. Compared to the previous LARP Technology Quadrupole and Long Quadrupole magnets, the purpose of HQ is also to demonstrate accelerator quality features such as alignment and cooling. So far, 8 HQ coils have been fabricated and 4 of them have been assembled and tested in HQ01a. This paper presents the mechanical assembly and test results of HQ01a.

  10. A method of radon monitoring in bore well waters for earthquake prediction : a case study at Pyntheromukrah, Shillong. India

    International Nuclear Information System (INIS)

    The variations of radon concentration in well waters have been used as a precursor of an oncoming earthquake. A closed circuit technique of radon measurement is used to monitor radon in water from a bore well at Pyntheromukrah, Shillong. The variation of 35 to 210 alpha counts per 50 seconds of the radon concentration in the water has been correlated to the local earthquake monitored by the Indian meteorological Department at Upper Shillong and to the meteorological variations which might have affected it. Though no major event has taken place during the period of two years of observation, a fair degree of correlation is observed with earthquakes of medium magnitude taking place even at large distances. The importance of this paper is restricted to a large extent on the development of the technology of radon monitoring for earthquake prediction. 7 refs., 4 figures, 1 table. (author)

  11. 40Ar/39Ar geochronology, paleomagnetism, and evolution of the Boring volcanic field, Oregon and Washington, USA

    Science.gov (United States)

    Fleck, Robert J.; Hagstrum, Jonathan T.; Calvert, Andrew T.; Evarts, Russell C.; Conrey, Richard M.

    2014-01-01

    The 40Ar/39Ar investigations of a large suite of fine-grained basaltic rocks of the Boring volcanic field (BVF), Oregon and Washington (USA), yielded two primary results. (1) Using age control from paleomagnetic polarity, stratigraphy, and available plateau ages, 40Ar/39Ar recoil model ages are defined that provide reliable age results in the absence of an age plateau, even in cases of significant Ar redistribution. (2) Grouping of eruptive ages either by period of activity or by composition defines a broadly northward progression of BVF volcanism during latest Pliocene and Pleistocene time that reflects rates consistent with regional plate movements. Based on the frequency distribution of measured ages, periods of greatest volcanic activity within the BVF occurred 2.7–2.2 Ma, 1.7–0.5 Ma, and 350–50 ka. Grouped by eruptive episode, geographic distributions of samples define a series of northeast-southwest–trending strips whose centers migrate from south-southeast to north-northwest at an average rate of 9.3 ± 1.6 mm/yr. Volcanic activity in the western part of the BVF migrated more rapidly than that to the east, causing trends of eruptive episodes to progress in an irregular, clockwise sense. The K2O and CaO values of dated samples exhibit well-defined temporal trends, decreasing and increasing, respectively, with age of eruption. Divided into two groups by K2O, the centers of these two distributions define a northward migration rate similar to that determined from eruptive age groups. This age and compositional migration rate of Boring volcanism is similar to the clockwise rotation rate of the Oregon Coast Range with respect to North America, and might reflect localized extension on the trailing edge of that rotating crustal block.

  12. Development of a fuseless small-bore railgun for injection of high-speed hydrogen pellets into magnetically confined plasmas

    Energy Technology Data Exchange (ETDEWEB)

    Kim, K.; Zhang, J.; King, T.L.; Manns, W.C.; Haywood, R.G. (Fusion Technology and Charged Particle Research Lab., Urbana, IL (United States))

    1993-01-01

    The most effective known way of refueling a tokamak fusion reactor is to inject high-speed pellets composed of fusion fuel (i.e., isotopes of hydrogen) at a controlled rate and velocity. To effect such a fueling scheme, in particular for contemporary and future large tokamaks, pellet speeds as high as 10 km/s and injection rates as high a 10 Hz may very well be required. Also, to prevent the onset of plasma instabilities pellet sizes need to be maintained below 3 to 4 mm in diameter. These requirements, plus the fact that the yield strength of frozen hydrogen is extremely low ([approximately]2 atmospheres) make the task of developing in ideal pellet injection scheme a challenge. In an attempt to meet this challenge, a fuseless small-bore railgun has been under development at the University of Illinois during the past several years. Some of the unique features of this railgun system are: (1) it is a two-stage accelerator with the first stage consisting of a combination of a hydrogen pellet generator and a gas gun, and the second stage a railgun, (2) it is a fuseless railgun in that the plasma armature is formed by electrically breaking down the propellant gas immediately behind the pellet, (3) it is a smallbore railgun with the bore size in the range of a few millimeters in diameter. This report presents a brief review of some of the existing hydrogen pellet acceleration techniques, an overview of the University of Illinois railgun program, the results to date, and the future plan.

  13. Development of small-bore, high-current-density railgun as testbed for study of plasma-materials interaction. Progress report for October 16, 2000 - May 13, 2003

    International Nuclear Information System (INIS)

    The present document is a final technical report summarizing the progress made during 10/16/2000 - 05/13/2003 toward the development of a small-bore railgun with transaugmentation as a testbed for investigating plasma-materials interaction

  14. Wide-bore 1.5 Tesla MR imagers for guidance and monitoring of radiofrequency ablation of renal cell carcinoma: initial experience on feasibility

    International Nuclear Information System (INIS)

    This study was conducted to test and demonstrate the feasibility of magnetic resonance (MR)-guided radiofrequency (RF) ablation of renal cell carcinoma (RCC) using a 1.5 T whole-body scanner equipped with a wide-bore superconductive magnet. Two patients with contrast-enhancing renal masses were treated with multipolar RF ablation (Celon ProSurge). Applicator navigation and near real-time ablation monitoring were performed in a wide-bore 1.5 T scanner using adapted fluoroscopic and diagnostic sequences. In addition to T2-weighted imaging for ablation monitoring, perfusion-weighted images acquired with an arterial spin-labeling technique (FAIR-TrueFISP) were applied. Results were compared to a previous study on 12 patients performed at 0.2 T. Navigation and monitoring of RF ablation using the wide-bore system operating at 1.5 T were clearly improved compared to former experiences on a 0.2 T MR unit. Fluoroscopic and diagnostic images for MR guidance could be acquired with distinctly higher image quality and shorter acquisition time resulting in higher accuracy of applicator placement and shorter treatment time. Spin-labeling perfusion imaging exhibited good image quality, potentially providing additional clinically important information. MR-guided RF ablation of RCC can safely be performed in a 1.5 T wide-bore scanner offering higher image quality, shorter acquisition time, and new monitoring modalities not feasible at 0.2 T. (orig.)

  15. Characterization of the excavation disturbance caused by boring of the experimental full scale deposition holes in the Research Tunnel of Olkiluoto

    International Nuclear Information System (INIS)

    Three holes, the size of deposition holes, were bored in the Research Tunnel using a novel full-face boring technique. During the boring test, procedures were carried out in order to determine the effect of changes in operating parameters on the performance of the boring machine and the quality of the hole. Evaluation of the quality of the hole included studies of the geometry of the holes, measurements of surface roughness using a laser profilometer, rock mechanical determinations and study of excavation disturbances in the zone adjacent to the surface of the holes using two novel methods, the He-gas method and the 14C-polymethylmethacrylate (14C-PMMA) method. It was found that there is a distinct disturbed zone adjacent to the surface of the full scale deposition holes which can be divided into three different zones. The zones are as follows: a crushed zone penetrating to a depth of about 3 mm from the surface, a fractured zone extending to a depth of 6 - 10 mm from the crushed zone and a micro fractured zone extending to a depth of 15 - 31 mm from the fractured zone. The porosity of the rock in the disturbed zone measured using the 14C-PMMA method was clearly greater than the porosity of undisturbed rock to a depth of about 11 mm. The values of permeability and effective diffusion coefficient in the disturbed zone measured in a direction perpendicular to the disturbed surface were found to be approximately one order of magnitude larger than those of undisturbed rock. The degree of disturbance was found to be greater where higher levels of thrust had been employed during the boring process. The results obtained also suggest that the disturbance caused by using 4- and 5-row cutters in the cutter head is more pronounced than the disturbance caused when using 5- and 6-row cutters

  16. 差动斜楔精密微调镗刀排的研究%The researches in differential wedge micro-adjustable boring tool row

    Institute of Scientific and Technical Information of China (English)

    胡运林

    2012-01-01

    采用差动螺距作为微调机构,成功地解决了镗刀直径的精确调节问题.采用差动螺距可以获得比一般螺距更高的微调精度.装置中采用斜楔机构主要实现换向,使差动螺杆的空间布置可以平行于镗杆轴线而不垂直于镗杆轴线,使整个装置安全性高、结构紧凑.装置中设置有两个刀杆安装位置,可以实现高效的镗刀排加工方式.刀杆接口采用莫氏锥实现联接,使刀具安装的通用性较大,可以安装镗刀、钻头、铣刀等多种刀具.%Using differential pitch as the fine-tuning component,it successfully solved the problem about which the precise adjusting boring tool diameter. The use of differential pitch can get a higher fine-tuning accuracy than the general. The devices use primarily wedge institutions to change direction, it makes the differential screw' s spatial arrangement been parallel to the axis of the boring bar and not arranged perpendicular to the axis of the boring bar, so that the whole device is safe and compact. The device has two arbor installation position.it can successfully efficiently complete processing by the method using the boring tool row. Arbor interface using morse taper to achieve connection, it makes the tool' s install had the high versatility, so you can install the boring tools, drills, milling cutters and other tools.

  17. An assessment of image distortion and CT number accuracy within a wide-bore CT extended field of view.

    Science.gov (United States)

    Beeksma, B; Truant, D; Holloway, L; Arumugam, S

    2015-06-01

    Although wide bore computed tomography (CT) scanners provide increased space for patients, the scan field of view (sFOV) remains considerably smaller than the bore size. Consequently, patient anatomy which spans beyond the sFOV is truncated and the information is lost. As a solution, some manufacturers provide the capacity to reconstruct CT images from a partial dataset at an extended field of view (eFOV). To assess spatial distortion within this eFOV three phantoms were considered a 30 × 30 × 20 cm(3) slab of solid water, the Gammex electron density CT phantom and a female anthropomorphic phantom. For each phantom, scans were taken centrally within the sFOV as a reference image and with the phantom edge extended at 1 cm intervals from 0 to 5 cm beyond the sFOV into the eFOV. To assess CT number accuracy various tissue equivalent materials were scanned in the eFOV and resulting CT numbers were compared to inserts scanned within the sFOV. For all phantom geometries, objects within the eFOV were geometrically overestimated with elongation of phantom shapes into the eFOV. The percentage increase in size ranged from 0.22 to 15.94 % over all phantoms considered. The difference between eFOV and sFOV CT numbers was dependent upon insert density. The eFOV underestimated CT numbers in the range of -127 to -230 HU for soft tissue densities and -278 to -640 for bone densities. This trend reversed for low tissue densities with the CT numbers in the eFOV being overestimated by 100-130 HU for lung equivalent inserts. Initial correlation between eFOV and sFOV CT numbers was seen and a correction function was successfully applied to better estimate the CT number representative of that seen within the sFOV. PMID:26048719

  18. Development of Neural Network Model for Predicting Peak Ground Acceleration Based on Microtremor Measurement and Soil Boring Test Data

    Directory of Open Access Journals (Sweden)

    T. Kerh

    2012-01-01

    Full Text Available It may not be possible to collect adequate records of strong ground motions in a short period of time; hence microtremor survey is frequently conducted to reveal the stratum structure and earthquake characteristics at a specified construction site. This paper is therefore aimed at developing a neural network model, based on available microtremor measurement and on-site soil boring test data, for predicting peak ground acceleration at a site, in a science park of Taiwan. The four key parameters used as inputs for the model are soil values of the standard penetration test, the medium grain size, the safety factor against liquefaction, and the distance between soil depth and measuring station. The results show that a neural network model with four neurons in the hidden layer can achieve better performance than other models presently available. Also, a weight-based neural network model is developed to provide reliable prediction of peak ground acceleration at an unmeasured site based on data at three nearby measuring stations. The method employed in this paper provides a new way to treat this type of seismic-related problem, and it may be applicable to other areas of interest around the world.

  19. A Microperfusion and In-Bore Oxygenator System Designed for Magnetic Resonance Microscopy Studies on Living Tissue Explants

    Science.gov (United States)

    Flint, Jeremy J.; Menon, Kannan; Hansen, Brian; Forder, John; Blackband, Stephen J.

    2015-12-01

    Spectrometers now offer the field strengths necessary to visualize mammalian cells but were not designed to accommodate imaging of live tissues. As such, spectrometers pose significant challenges—the most evident of which are spatial limitations—to conducting experiments in living tissue. This limitation becomes problematic upon trying to employ commercial perfusion equipment which is bulky and—being designed almost exclusively for light microscopy or electrophysiology studies—seldom includes MR-compatibility as a design criterion. To overcome problems exclusive to ultra-high magnetic field environments with limited spatial access, we have designed microperfusion and in-bore oxygenation systems capable of interfacing with Bruker’s series of micro surface-coils. These devices are designed for supporting cellular resolution imaging in MR studies of excised, living tissue. The combined system allows for precise control of both dissolved gas and pH levels in the perfusate thus demonstrating applicability for a wide range of tissue types. Its compactness, linear architecture, and MR-compatible material content are key design features intended to provide a versatile hardware interface compatible with any NMR spectrometer. Such attributes will ensure the microperfusion rig’s continued utility as it may be used with a multitude of contemporary NMR systems in addition to those which are currently in development.

  20. Ultra-wide bore 900 MHz high-resolution NMR at the National High Magnetic Field Laboratory

    Science.gov (United States)

    Fu, R.; Brey, W. W.; Shetty, K.; Gor'kov, P.; Saha, S.; Long, J. R.; Grant, S. C.; Chekmenev, E. Y.; Hu, J.; Gan, Z.; Sharma, M.; Zhang, F.; Logan, T. M.; Brüschweller, R.; Edison, A.; Blue, A.; Dixon, I. R.; Markiewicz, W. D.; Cross, T. A.

    2005-11-01

    Access to an ultra-wide bore (105 mm) 21.1 T magnet makes possible numerous advances in NMR spectroscopy and MR imaging, as well as novel applications. This magnet was developed, designed, manufactured and tested at the National High Magnetic Field Laboratory and on July 21, 2004 it was energized to 21.1 T. Commercial and unique homebuilt probes, along with a standard commercial NMR console have been installed and tested with many science applications to develop this spectrometer as a user facility. Solution NMR of membrane proteins with enhanced resolution, new pulse sequences for solid state NMR taking advantage of narrowed proton linewidths, and enhanced spatial resolution and contrast leading to improved animal imaging have been documented. In addition, it is demonstrated that spectroscopy of single site 17O labeled macromolecules in a hydrated lipid bilayer environment can be recorded in a remarkably short period of time. 17O spectra of aligned samples show the potential for using this data for orientational restraints and for characterizing unique details of cation binding properties to ion channels. The success of this NHMFL magnet illustrates the potential for using a similar magnet design as an outsert for high temperature superconducting insert coils to achieve an NMR magnet with a field >25 T.

  1. Analysis of Eddy Current Capabilities for the Detection of Outer Diameter Stress Corrosion Cracking in Small Bore Metallic Structures

    Science.gov (United States)

    Wincheski, Buzz; Williams, Phillip; Simpson, John

    2007-01-01

    The use of eddy current techniques for the detection of outer diameter damage in tubing and many complex aerospace structures often requires the use of an inner diameter probe due to a lack of access to the outside of the part. In small bore structures the probe size and orientation are constrained by the inner diameter of the part, complicating the optimization of the inspection technique. Detection of flaws through a significant remaining wall thickness becomes limited not only by the standard depth of penetration, but also geometrical aspects of the probe. Recently, an orthogonal eddy current probe was developed for detection of such flaws in Space Shuttle Primary Reaction Control System (PRCS) Thrusters. In this case, the detection of deeply buried stress corrosion cracking by an inner diameter eddy current probe was sought. Probe optimization was performed based upon the limiting spatial dimensions, flaw orientation, and required detection sensitivity. Analysis of the probe/flaw interaction was performed through the use of finite and boundary element modeling techniques. Experimental data for the flaw detection capabilities, including a probability of detection study, will be presented along with the simulation data. The results of this work have led to the successful deployment of an inspection system for the detection of stress corrosion cracking in Space Shuttle Primary Reaction Control System (PRCS) Thrusters.

  2. Selected Abiotic and Biotic Environmental Stress Factors Affecting Two Economically Important Sugarcane Stalk Boring Pests in the United States

    Directory of Open Access Journals (Sweden)

    Allan T. Showler

    2016-02-01

    Full Text Available Sugarcane, Saccharum spp., in the United States is attacked by a number of different arthropod pests. The most serious among those pests are two stalk boring moths in the Family Crambidae: the sugarcane borer, Diatraea saccharalis (F., and the Mexican rice borer, Eoreuma loftini (Dyar. The two species are affected by abiotic and biotic environmental stress factors. Water deficit and excessive soil nitrogen alter physical and physiochemical aspects of the sugarcane plant that make the crop increasingly vulnerable to E. loftini. Weed growth can be competitive with sugarcane but it also supports enhanced abundances and diversity of natural enemies that can suppress infestations of D. saccharalis. In an instance where the stalk borer is considered a stress factor, proximity of vulnerable crops to sugarcane can influence levels of E. loftini infestation of sugarcane. The adverse effects of each stress factor, in terms of stalk borer attack, can be reduced by adopting appropriate cultural practices, such as adequate irrigation, judicious use of nitrogen fertilizer, using noncompetitive weed growth, and not planting vulnerable crops near sugarcane fields. Understanding the relationships between stress factors and crop pests can provide valuable insights for plant breeders and tools for incorporation into integrated pest management strategies.

  3. Performance characteristics of tunnel boring machine in basalt and pyroclastic rocks of Deccan traps-A case study

    Institute of Scientific and Technical Information of China (English)

    Prasnna Jain; A.K. Naithani; T.N. Singh

    2014-01-01

    A 12.24 km long tunnel between Maroshi and Ruparel College is being excavated by tunnel boring machine (TBM) to improve the water supply system of Greater Mumbai, India. In this paper, attempt has been made to establish the relationship between various litho-units of Deccan traps, stability of tunnel and TBM performances during the construction of 5.83 km long tunnel between Maroshi and Vakola. The Maroshi-Vakola tunnel passes under the Mumbai Airport and crosses both runways with an overburden cover of around 70 m. The tunneling work was carried out without disturbance to the ground. The rock types encountered during excavation are fine compacted basalt, porphyritic basalt, amygdaloidal basalt, pyroclastic rocks with layers of red boles and intertrappean beds consisting of various types of shales. Relations between rock mass properties, physico-mechanical properties, TBM specifications and the cor-responding TBM performance were established. A number of support systems installed in the tunnel during excavation were also discussed. The aim of this paper is to establish, with appropriate accuracy, the nature of subsurface rock mass condition and to study how it will react to or behave during under-ground excavation by TBM. The experiences gained from this project will increase the ability to cope with unexpected ground conditions during tunneling using TBM.

  4. Improvement of microwave feeding on a large bore ECRIS with permanent magnets by using coaxial semi-dipole antenna

    International Nuclear Information System (INIS)

    We are constructing a tandem type electron cyclotron resonance (ECR) ion source (ECRIS). The first stage of this ECRIS has a large-bore with cylindrically comb-shaped permanent magnets. 2.45GHz and 11-13GHz microwaves can be supplied individually and simultaneously to the plasma chamber. For 2.45GHz, a coaxial semi-dipole antenna is used to feed the microwaves. In previous experiments, there were two problems encountered when running the 2.45GHz microwaves. High incident power was necessary to keep ECR discharge at low operating pressure because of high reflected microwave power. The surface of a support insulator between the inner and the outer electrodes of coaxial semi-dipole antenna was easily metalized by sputtering of the metal wall inside the chamber. The purpose of this study was to solve these problems. Performing several simulation experiments supports the hypothesis that the position of the support insulator is significant for microwave power efficiency. The end result was the ability to sustain ECR discharges at extremely low incident microwave power, several tens of watts, by optimized matching of the position and shape of the insulator.

  5. Performance characteristics of tunnel boring machine in basalt and pyroclastic rocks of Deccan traps – A case study

    Directory of Open Access Journals (Sweden)

    Prasnna Jain

    2014-02-01

    Full Text Available A 12.24 km long tunnel between Maroshi and Ruparel College is being excavated by tunnel boring machine (TBM to improve the water supply system of Greater Mumbai, India. In this paper, attempt has been made to establish the relationship between various litho-units of Deccan traps, stability of tunnel and TBM performances during the construction of 5.83 km long tunnel between Maroshi and Vakola. The Maroshi–Vakola tunnel passes under the Mumbai Airport and crosses both runways with an overburden cover of around 70 m. The tunneling work was carried out without disturbance to the ground. The rock types encountered during excavation are fine compacted basalt, porphyritic basalt, amygdaloidal basalt, pyroclastic rocks with layers of red boles and intertrappean beds consisting of various types of shales. Relations between rock mass properties, physico-mechanical properties, TBM specifications and the corresponding TBM performance were established. A number of support systems installed in the tunnel during excavation were also discussed. The aim of this paper is to establish, with appropriate accuracy, the nature of subsurface rock mass condition and to study how it will react to or behave during underground excavation by TBM. The experiences gained from this project will increase the ability to cope with unexpected ground conditions during tunneling using TBM.

  6. Measurement-based model of a wide-bore CT scanner for Monte Carlo dosimetric calculations with GMCTdospp software.

    Science.gov (United States)

    Skrzyński, Witold

    2014-11-01

    The aim of this work was to create a model of a wide-bore Siemens Somatom Sensation Open CT scanner for use with GMCTdospp, which is an EGSnrc-based software tool dedicated for Monte Carlo calculations of dose in CT examinations. The method was based on matching spectrum and filtration to half value layer and dose profile, and thus was similar to the method of Turner et al. (Med. Phys. 36, pp. 2154-2164). Input data on unfiltered beam spectra were taken from two sources: the TASMIP model and IPEM Report 78. Two sources of HVL data were also used, namely measurements and documentation. Dose profile along the fan-beam was measured with Gafchromic RTQA-1010 (QA+) film. Two-component model of filtration was assumed: bow-tie filter made of aluminum with 0.5 mm thickness on central axis, and flat filter made of one of four materials: aluminum, graphite, lead, or titanium. Good agreement between calculations and measurements was obtained for models based on the measured values of HVL. Doses calculated with GMCTdospp differed from the doses measured with pencil ion chamber placed in PMMA phantom by less than 5%, and root mean square difference for four tube potentials and three positions in the phantom did not exceed 2.5%. The differences for models based on HVL values from documentation exceeded 10%. Models based on TASMIP spectra and IPEM78 spectra performed equally well. PMID:25028213

  7. Effect of bore fluid composition on microstructure and performance of a microporous hollow fibre membrane as a cation-exchange substrate.

    Science.gov (United States)

    Lazar, R A; Mandal, I; Slater, N K H

    2015-05-15

    Micro-capillary film (MCF) membranes are effective platforms for bioseparations and viable alternatives to established packed bed and membrane substrates at the analytical and preparative chromatography scales. Single hollow fibre (HF) MCF membranes with varied microstructures were produced in order to evaluate the effect of the bore fluid composition used during hollow fibre extrusion on their structure and performance as cation-exchange adsorbers. Hollow fibres were fabricated from ethylene-vinyl alcohol (EVOH) copolymer through solution extrusion followed by nonsolvent induced phase separation (NIPS) using bore fluids of differing composition (100wt.% N-methyl-2-pyrrolidone (NMP), 100wt.% glycerol, 100wt.% water). All HFs displayed highly microporous and mesoporous microstructures, with distinct regions of pore size membrane performance as a result of inner surface porosity was established with a view to applying this parameter for the optimisation of multi-capillary MCF performance in future studies. PMID:25840664

  8. Numerical simulation of bearing capacity of the bored pile in soft rock%软岩钻孔灌注桩承载力的数值模拟

    Institute of Scientific and Technical Information of China (English)

    高长岭; 李荣峰; 柴建峰

    2012-01-01

    如何确定软岩地区钻孔灌注桩的承载力是一个复杂而又亟待解决的问题.本文以南京长江三桥软岩钻孔灌注桩为例,利用数值模拟法(FLAC3D模拟分析),模拟南京长江三桥软岩钻孔灌注桩逐级加载后的受力性状,根据得到的桩周土岩的应力场、位移场及破坏区的分布和扩展,确定软岩钻孔灌注桩的极限承载力.将数值模拟结果和自平衡测试结果进行比较,笔者发现两者吻合较好.%A method for determining the bearing capacity of bored piles in soft rock areas has been a complex problem that should be solved urgently. Taking the bored piles in soft rock of the third bridge over the Yangtze River in Nanjing as an example and using the numerical simulation method (FLAC3D simulation analysis), this paper simulated the force behavior of the bored piles in soft rock of the third bridge over the Yangtze River in Nanjing in the case of step stress test. Based on stress field, displacement field and the distribution and expansion of the failure zone obtained in the soil and rock around the pile, the authors determined the ultimate bearing capacity of the bored pile in soft rock. A comparison with the numerical simulation results and the self-balanced load test results shows that the numerical simulation result agrees well with the self-balanced load test result.

  9. SU-E-I-20: Comprehensive Quality Assurance Test of Second Generation Toshiba Aquilion Large Bore CT Simulator Based On AAPM TG-66 Recommendations

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, D [Toshiba America Medical Systems, Tustin, CA (United States)

    2015-06-15

    Purpose: AAPM radiation therapy committee task group No. 66 (TG-66) published a report which described a general approach to CT simulator QA. The report outlines the testing procedures and specifications for the evaluation of patient dose, radiation safety, electromechanical components, and image quality for a CT simulator. The purpose of this study is to thoroughly evaluate the performance of a second generation Toshiba Aquilion Large Bore CT simulator with 90 cm bore size (Toshiba, Nasu, JP) based on the TG-66 criteria. The testing procedures and results from this study provide baselines for a routine QA program. Methods: Different measurements and analysis were performed including CTDIvol measurements, alignment and orientation of gantry lasers, orientation of the tabletop with respect to the imaging plane, table movement and indexing accuracy, Scanogram location accuracy, high contrast spatial resolution, low contrast resolution, field uniformity, CT number accuracy, mA linearity and mA reproducibility using a number of different phantoms and measuring devices, such as CTDI phantom, ACR image quality phantom, TG-66 laser QA phantom, pencil ion chamber (Fluke Victoreen) and electrometer (RTI Solidose 400). Results: The CTDI measurements were within 20% of the console displayed values. The alignment and orientation for both gantry laser and tabletop, as well as the table movement and indexing and scanogram location accuracy were within 2mm as specified in TG66. The spatial resolution, low contrast resolution, field uniformity and CT number accuracy were all within ACR’s recommended limits. The mA linearity and reproducibility were both well below the TG66 threshold. Conclusion: The 90 cm bore size second generation Toshiba Aquilion Large Bore CT simulator that comes with 70 cm true FOV can consistently meet various clinical needs. The results demonstrated that this simulator complies with the TG-66 protocol in all aspects including electromechanical component

  10. Simultaneous Effect of Organic Modifier and Physicochemical Parameters of Barbiturates on their Retention on a Narrow-Bore PGC Column. Part 2

    OpenAIRE

    Cserháti, Tibor; Szőgyi, Maria

    2011-01-01

    The retention time of 23 barbituric acid derivatives was determined on an narrow-bore porous graphitized carbon (PGC) column employing water-dioxane mixtures as mobile phases. The retention fac-tor (k), theoretical plate number (N), and asymmetry factor (AF) were computed for each analyte in each mobile phase. Quantitative structure-retention relationship (QSRR) calculations using stepwise regression analysis (SRA) demonstrated the binding of analytes to the surface of PGC stationary phase is...

  11. SU-E-I-20: Comprehensive Quality Assurance Test of Second Generation Toshiba Aquilion Large Bore CT Simulator Based On AAPM TG-66 Recommendations

    International Nuclear Information System (INIS)

    Purpose: AAPM radiation therapy committee task group No. 66 (TG-66) published a report which described a general approach to CT simulator QA. The report outlines the testing procedures and specifications for the evaluation of patient dose, radiation safety, electromechanical components, and image quality for a CT simulator. The purpose of this study is to thoroughly evaluate the performance of a second generation Toshiba Aquilion Large Bore CT simulator with 90 cm bore size (Toshiba, Nasu, JP) based on the TG-66 criteria. The testing procedures and results from this study provide baselines for a routine QA program. Methods: Different measurements and analysis were performed including CTDIvol measurements, alignment and orientation of gantry lasers, orientation of the tabletop with respect to the imaging plane, table movement and indexing accuracy, Scanogram location accuracy, high contrast spatial resolution, low contrast resolution, field uniformity, CT number accuracy, mA linearity and mA reproducibility using a number of different phantoms and measuring devices, such as CTDI phantom, ACR image quality phantom, TG-66 laser QA phantom, pencil ion chamber (Fluke Victoreen) and electrometer (RTI Solidose 400). Results: The CTDI measurements were within 20% of the console displayed values. The alignment and orientation for both gantry laser and tabletop, as well as the table movement and indexing and scanogram location accuracy were within 2mm as specified in TG66. The spatial resolution, low contrast resolution, field uniformity and CT number accuracy were all within ACR’s recommended limits. The mA linearity and reproducibility were both well below the TG66 threshold. Conclusion: The 90 cm bore size second generation Toshiba Aquilion Large Bore CT simulator that comes with 70 cm true FOV can consistently meet various clinical needs. The results demonstrated that this simulator complies with the TG-66 protocol in all aspects including electromechanical component

  12. A new species and new records of parasitic wasps (Hymenoptera: Pteromalidae of wood boring beetles from southern Western Ghats, Kerala, India

    Directory of Open Access Journals (Sweden)

    P.M. Sureshan

    2013-07-01

    Full Text Available A new species of Pteromalidae (Hymenoptera: Chalcidoidea parasitising wood boring beetles, Cleonymus kamijoi, and two species of Pteromalidae, Trigonoderus pulcher Walker and male of Heydenia tuberculata Sureshan are reported for the first time from the southern Western Ghats, Kerala. The genus Trigonoderus Westwood is reported for the first time from India and the male of Heydenia tuberculata Sureshan is reported and described for the first time.

  13. Novel insights into the tribology of hypereutectic AlSi cylinder bore surfaces; Neue Erkenntnisse zur Tribologie von uebereutektischen AlSi-Zylinderlaufflaechen

    Energy Technology Data Exchange (ETDEWEB)

    Dienwiebel, M.; Scherge, M. [IAVF Antriebstechnik AG, Karlsruhe (Germany)

    2007-03-15

    Aluminium alloys remain highly attractive for weight reduction measures. Yet the fundamental mechanisms on the nanometre scale which dominate friction and wear are still largely unexplored. Using state-of-the-art surface analytical tools scientists at IAVF Antriebstechnik AG have studied the cylinder bore surface of a hypereutectic AlSi crankcase. These investigations led to a new model that is able to explain a number of wear phenomena of AlSi materials. (orig.)

  14. A study on optimal scan conditions of big bore multi-slice computed tomography based on radiation dose and image noise

    International Nuclear Information System (INIS)

    The newly introduced Big Bore computed tomography (CT) has a possibility to increase the tube current product scan time (mA s) for compensation of image degradation due to larger gentry opening without sound guideline. The objective of this paper is to derive optimal scan conditions for Big Bore CT scanner, mainly relating to the dose of diagnostic CT. The weighted CT dose index (CTDIw) was estimated at five typical protocols, such as head and neck, brain, paediatric, chest and abdomen. Noises were analysed in a circle of 1 or 2 cm of diameter in CT image slice. The results showed that measured CTDIw values generally follow the theoretical rule at all scanning conditions of every protocol. Although image noises decrease with increment of mA s, analysed image noises do follow the theoretical rule, but only in specific protocols. This phenomenon is presumed to result from the photon energy spectra arriving at the detection system of the Big Bore scanner. (authors)

  15. Fast Determination of Toxic Arsenic Species in Food Samples Using Narrow-bore High-Performance Liquid-Chromatography Inductively Coupled Plasma Mass Spectrometry.

    Science.gov (United States)

    Terol, Amanda; Marcinkowska, Monika; Ardini, Francisco; Grotti, Marco

    2016-01-01

    A new method for the speciation analysis of arsenic in food using narrow-bore high-performance liquid-chromatography inductively coupled plasma mass spectrometry (HPLC-ICP-MS) has been developed. Fast separation of arsenite, arsenate, monomethylarsonic acid and dimethylarsinic acid was carried out in 7 min using an anion-exchange narrow-bore Nucleosil 100 SB column and 12 mM ammonium dihydrogen phosphate of pH 5.2 as the mobile phase, at a flow rate of 0.3 mL min(-1). A PFA-ST micronebulizer jointed to a cyclonic spray chamber was used for HPLC-ICP-MS coupling. Compared with standard-bore HPLC-ICP-MS, the new method has provided higher sensitivity, reduced mobile-phase consumption, a lower matrix plasma load and a shorter analysis time. The achieved instrumental limits of detection were in the 0.3 - 0.4 ng As mL(-1) range, and the precision was better than 3%. The arsenic compounds were efficiently (>80%) extracted from various food samples using a 1:5 methanol/water solution, with additional ultrasonic treatment for rice products. The applicability of this method was demonstrated by the analysis of several samples, such as seafood (fish, mussels, shrimps, edible algae) and rice-based products (Jasmine and Arborio rice, spaghetti, flour, crackers), including three certified reference materials. PMID:27506720

  16. CT-guided large-bore cutting biopsy of diffuse interstitial or alveolar lung disease. Perkutane CT-kontrollierte Schneidbiopsie diffuser interstitieller und alveolaerer Lungenerkrankungen - Technik und Ergebnisse

    Energy Technology Data Exchange (ETDEWEB)

    Klose, K.C. (RWTH Aachen, Klinik fuer Radiologische Diagnostik (Germany)); Biesterfeld, S.; Boecking, A. (RWTH Aachen, Inst. fuer Pathologie (Germany))

    1992-07-01

    Twenty-three patients underwent CT-guided large-bore biopsy of diffuse lung disease of clinically and radiologically indeterminate etiology. The procedure was preceded by negative transbronchial biopsy in 20 cases. CT-guided biopsies were performed with a 14-gauge Trucut-needle. Obtaining at least 3 specimens of different parts of the diseased area, a correct histologic diagnosis was achieved in all cases. The size of the histologic specimens (mean: 5-6 mm) exceeded that of the specimens obtained by transbronchial biopsy as reported in the literature. Two major complications occurred and included a rapidly developing tension pneumothorax treated by a small-bore catheter and one self-limited hemoptysis. Major advantages of percutaneous CT-guided biopsy are the nonsuperimposed and very sensitive imaging of lung alterations in diffuse lung diseases that allows evidence of adjacent less and more involved areas accessible by one biopsy approach. CT-guided large-bore biopsy with a cutting needle seems to be a very promising, accurate method in the pathmorphologic work-up of diffuse lung diseases rendering open biopsy unnecessary in many cases. (orig.).

  17. Chemical and isotopic analysis of boron in uranium by mass spectrometry; Analyse chimique et isotopique du bore dans l'uranium par spectrometrie de masse

    Energy Technology Data Exchange (ETDEWEB)

    Chenouard, J.; Nief, G. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1967-07-01

    A method is described for the determination by mass spectrometry of the concentration and the isotopic composition of small quantities of boron in uranium. The concentration range is between 10 and 100 ppm. The boron is extracted by distillation of methyl borate. The concentration is attained by isotopic dilution. Many precautions have to be taken to limit and correct contaminations. This method of analysis is applicable for at least 0.2 {mu}g of boron; the relative accuracy is about 2 per cent. (authors) [French] On decrit une methode de determination par spectrometrie de masse de la concentration et de la composition isotopique de faibles quantites de bore dans l'uranium. Le domaine de concentration est compris entre 10 et 100 ppm. L'extraction du bore s'effectue par distillation du borate de methyle. La concentration est atteinte par dilution isotopique. De nombreuses precautions doivent etre prises pour limiter et corriger les contaminations. L'analyse est possible a partir de 0,2 {mu}g de bore avec une precision relative de l'ordre de 2 pour cent. (auteurs)

  18. MR-guided radiofrequency ablation using a wide-bore 1.5-T MR system: clinical results of 213 treated liver lesions

    International Nuclear Information System (INIS)

    To evaluate the technical effectiveness, technical success and patient safety of MR-guided radiofrequency (RF) ablation of liver malignancies using a wide-bore 1.5-T MR system. In 110 patients, 56 primary liver lesions and 157 liver metastases were treated in 157 sessions using percutaneous RF ablation. Mean lesion diameter was 20 mm (range 4-54 mm). All planning, procedural and post-interventional control MR investigations were carried out using a wide-bore 1.5-T MR system. Technical success was assessed by a contrast-enhanced MR liver examination immediately after the intervention. Technique effectiveness was assessed by dynamic hepatic MR study 1 month post ablation; mean follow-up period was 24.2 months (range 5-44). Technical success and technique effectiveness were achieved in 210/213 lesions (98.6 %). In 18/210 lesions (8.6 %), local tumour progression occurred 4-28 months after therapy. Seven of these 18 lesions were treated in a second session achieving complete ablation, 6 other lesions were referred to surgery. Overall RF effectiveness rate was 199/213 (93.4 %); overall therapy success (including surgery) was 205/213 (96.2 %). Two major complications (1.3 %) (bleeding and infected biloma) and 14 (8.9 %) minor complications occurred subsequent to 157 interventions. Wide-bore MR-guided RF ablation is a safe and effective treatment option for liver lesions. (orig.)

  19. Production of the heat exchanger tubes, which will cool down the LHC magnets, and of the cold bore tubes, in which the proton beams will circulate, is due to be completed around the end of 2004. These essential components of the LHC magnets are receiving their finishing touches at CERN : cold bore tubes

    CERN Multimedia

    Maximilien Brice

    2003-01-01

    Insulation of the cold bore tubes in which the LHC beams will circulate takes place in Building 927. In the background, Bruno Meunier checks the wrapping machine while, in the foreground, Olivier Vasseur removes the polyester wrapping that covers the tube's insulating layers.

  20. Model 96 of the Aespoe site. Results of prediction and outcome based on surface and underground bore hole investigations

    International Nuclear Information System (INIS)

    The site characterisation work of the bedrock around Aespoe has been carried out as an interdisciplinary work in the fields of geology, hydrogeology and hydrochemistry. It has been carried out in different steps focusing on different scales simultaneously. The descriptions have been focused on regional, site and block scales representing areas/volumes of 10x20 km, 500x500x500 m and 50x50x50 m respectively during the pre-construction phase. During the tunnel construction phase the models have been focusing scales of 0-10, 10-100 and 100-1000 metres. The models after the pre-investigation stage were the base for predictions of geological, rock mechanical, hydrogeological and hydrochemical conditions along the planned tunnel for the Aespoe HRL. During construction of the tunnel geological and hydrogeological mapping were made and comprehensive investigation were performed to get geological, rock mechanical, hydrogeological and hydrochemical conditions which could be compared to the predicted. One objective was to test the ability to obtain a thorough understanding of the rock conditions based on investigations of the surface and investigations in and between bore holes from the surface. By 'understanding' we here mean to obtain sufficient knowledge to show how things are, but also to show how things cannot be. An important part of the comparison of the predictions with the outcome was to evaluate the usefulness and feasibility of pre-investigation methods. (Discussed in an other contribution to this conference). Another purpose was to evaluate the models made. This is discussed in the present contribution

  1. 3D printed titanium micro-bore columns containing polymer monoliths for reversed-phase liquid chromatography.

    Science.gov (United States)

    Gupta, Vipul; Talebi, Mohammad; Deverell, Jeremy; Sandron, Sara; Nesterenko, Pavel N; Heery, Brendan; Thompson, Fletcher; Beirne, Stephen; Wallace, Gordon G; Paull, Brett

    2016-03-01

    The potential of 3D selective laser melting (SLM) technology to produce compact, temperature and pressure stable titanium alloy chromatographic columns is explored. A micro bore channel (0.9 mm I.D. × 600 mm long) was produced within a 5 × 30 × 30 mm titanium alloy (Ti-6Al-4V) cuboid, in form of a double handed spiral. A poly(butyl methacrylate-co-ethyleneglycoldimethacrylate) (BuMA-co-EDMA) monolithic stationary phase was thermally polymerised within the channel for application in reversed-phase high-performance liquid chromatography. The prepared monolithic column was applied to the liquid chromatographic separation of intact proteins and peptides. Peak capacities of 69-76 (for 6-8 proteins respectively) were observed during isothermal separation of proteins at 44 °C which were further increased to 73-77 using a thermal step gradient with programmed temperature from 60 °C to 35 °C using an in-house built direct-contact heater/cooler platform based upon matching sized Peltier thermoelectric modules. Rapid temperature gradients were possible due to direct-contact between the planar metal column and the Peltier module, and the high thermal conductivity of the titanium column as compared to a similar stainless steel printed column. The separation of peptides released from a digestion of E.coli was also achieved in less than 35 min with ca. 40 distinguishable peaks at 210 nm. PMID:26873472

  2. Closed bore XMR (CBXMR) systems for aortic valve replacement: Active magnetic shielding of x-ray tubes

    Energy Technology Data Exchange (ETDEWEB)

    Bracken, John A.; DeCrescenzo, Giovanni; Komljenovic, Philip; Lillaney, Prasheel V.; Fahrig, Rebecca; Rowlands, J. A. [Department of Medical Biophysics and Sunnybrook Health Sciences Center, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5 (Canada); Department of Radiology, Stanford University, Stanford, California 94305 (United States); Department of Medical Biophysics and Sunnybrook Health Sciences Center, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5 (Canada)

    2009-05-15

    Hybrid closed bore x-ray/MRI systems are being developed to improve the safety and efficacy of percutaneous aortic valve replacement procedures by harnessing the complementary strengths of the x-ray and MRI modalities in a single interventional suite without requiring patient transfer between two rooms. These systems are composed of an x-ray C-arm in close proximity ({approx_equal}1 m) to an MRI scanner. The MRI magnetic fringe field can cause the electron beam in the x-ray tube to deflect. The deflection causes the x-ray field of view to shift position on the detector receptacle. This could result in unnecessary radiation exposure to the patient and the staff in the cardiac catheterization laboratory. Therefore, the electron beam deflection must be corrected. The authors developed an active magnetic shielding system that can correct for electron beam deflection to within an accuracy of 5% without truncating the field of view or increasing exposure to the patient. This system was able to automatically adjust to different field strengths as the external magnetic field acting on the x-ray tube was changed. Although a small torque was observed on the shielding coils of the active shielding system when they were placed in a magnetic field, this torque will not impact their performance if they are securely mounted on the x-ray tube and the C-arm. The heating of the coils of the shielding system for use in the clinic caused by electric current was found to be slow enough not to require a dedicated cooling system for one percutaneous aortic valve replacement procedure. However, a cooling system will be required if multiple procedures are performed in one session.

  3. Closed bore XMR (CBXMR) systems for aortic valve replacement: active magnetic shielding of x-ray tubes.

    Science.gov (United States)

    Bracken, John A; DeCrescenzo, Giovanni; Komljenovic, Philip; Lillaney, Prasheel V; Fahrig, Rebecca; Rowlands, J A

    2009-05-01

    Hybrid closed bore x-ray/MRI systems are being developed to improve the safety and efficacy of percutaneous aortic valve replacement procedures by harnessing the complementary strengths of the x-ray and MRI modalities in a single interventional suite without requiring patient transfer between two rooms. These systems are composed of an x-ray C-arm in close proximity (approximately 1 m) to an MRI scanner. The MRI magnetic fringe field can cause the electron beam in the x-ray tube to deflect. The deflection causes the x-ray field of view to shift position on the detector receptacle. This could result in unnecessary radiation exposure to the patient and the staff in the cardiac catheterization laboratory. Therefore, the electron beam deflection must be corrected. The authors developed an active magnetic shielding system that can correct for electron beam deflection to within an accuracy of 5% without truncating the field of view or increasing exposure to the patient. This system was able to automatically adjust to different field strengths as the external magnetic field acting on the x-ray tube was changed. Although a small torque was observed on the shielding coils of the active shielding system when they were placed in a magnetic field, this torque will not impact their performance if they are securely mounted on the x-ray tube and the C-arm. The heating of the coils of the shielding system for use in the clinic caused by electric current was found to be slow enough not to require a dedicated cooling system for one percutaneous aortic valve replacement procedure. However, a cooling system will be required if multiple procedures are performed in one session. PMID:19544789

  4. Use of a Tantalum Liner to Reduce Bore Erosion and Increase Muzzle Velocity in Two-Stage Light Gas Guns

    Science.gov (United States)

    Bogdanoff, David W.

    2015-01-01

    velocity and reduce bore erosion.

  5. MRI-Guided Intervention for Breast Lesions Using the Freehand Technique in a 3.0-T Closed-Bore MRI Scanner: Feasibility and Initial Results

    Energy Technology Data Exchange (ETDEWEB)

    Choi, Hye Young [Department of Radiology, Gyeongsang National University Hospital, Jinju 660-702 (Korea, Republic of); Kim, Sun Mi; Jang, Mijung; Yun, Bo La [Department of Radiology, Seoul National University Bundang Hospital, Seongnam 463-707 (Korea, Republic of); Kim, Sung-Won; Kang, Eunyoung [Department of Surgery, Seoul National University Bundang Hospital, Seongnam 463-707 (Korea, Republic of); Park, So Yeon [Department of Pathology, Seoul National University Bundang Hospital, Seongnam 463-707 (Korea, Republic of); Moon, Woo Kyung [Department of Radiology, Seoul National University College of Medicine, Seoul National University Hospital, Seoul 110-744 (Korea, Republic of); Ko, Eun Sook [Department of Radiology, Samsung Medical Center, Seoul 135-710 (Korea, Republic of)

    2013-07-01

    To report the feasibility of magnetic resonance imaging (MRI)-guided intervention for diagnosing suspicious breast lesions detectable by MRI only, using the freehand technique with a 3.0-T closed-bore MRI scanner. Five women with 5 consecutive MRI-only breast lesions underwent MRI-guided intervention: 3 underwent MRI-guided needle localization and 2, MRI-guided vacuum-assisted biopsy. The interventions were performed in a 3.0-T closed-bore MRI system using a dedicated phased-array breast coil with the patients in the prone position; the freehand technique was used. Technical success and histopathologic outcome were analyzed. MRI showed that four lesions were masses (mean size, 11.5 mm; range, 7-18 mm); and 1, a nonmass-like enhancement (maximum diameter, 21 mm). The locations of the lesions with respect to the breast with index cancer were as follows: different quadrant, same breast - 3 cases; same quadrant, same breast - 1 case; and contralateral breast - 1 case. Histopathologic evaluation of the lesions treated with needle localization disclosed perilobular hemangioma, fibrocystic change, and fibroadenomatous change. The lesions treated with vacuum-assisted biopsy demonstrated a radial scar and atypical apocrine hyperplasia. Follow-up MRI after 2-7 months (mean, 4.6 months) confirmed complete lesion removal in all cases. MRI-guided intervention for breast lesions using the freehand technique with a 3.0-T closed-bore MRI scanner is feasible and accurate for diagnosing MRI-only lesions.

  6. MRI-Guided Intervention for Breast Lesions Using the Freehand Technique in a 3.0-T Closed-Bore MRI Scanner: Feasibility and Initial Results

    International Nuclear Information System (INIS)

    To report the feasibility of magnetic resonance imaging (MRI)-guided intervention for diagnosing suspicious breast lesions detectable by MRI only, using the freehand technique with a 3.0-T closed-bore MRI scanner. Five women with 5 consecutive MRI-only breast lesions underwent MRI-guided intervention: 3 underwent MRI-guided needle localization and 2, MRI-guided vacuum-assisted biopsy. The interventions were performed in a 3.0-T closed-bore MRI system using a dedicated phased-array breast coil with the patients in the prone position; the freehand technique was used. Technical success and histopathologic outcome were analyzed. MRI showed that four lesions were masses (mean size, 11.5 mm; range, 7-18 mm); and 1, a nonmass-like enhancement (maximum diameter, 21 mm). The locations of the lesions with respect to the breast with index cancer were as follows: different quadrant, same breast - 3 cases; same quadrant, same breast - 1 case; and contralateral breast - 1 case. Histopathologic evaluation of the lesions treated with needle localization disclosed perilobular hemangioma, fibrocystic change, and fibroadenomatous change. The lesions treated with vacuum-assisted biopsy demonstrated a radial scar and atypical apocrine hyperplasia. Follow-up MRI after 2-7 months (mean, 4.6 months) confirmed complete lesion removal in all cases. MRI-guided intervention for breast lesions using the freehand technique with a 3.0-T closed-bore MRI scanner is feasible and accurate for diagnosing MRI-only lesions

  7. Hvilken betydning har organisasjonskultur for måten integrerte operasjoner håndteres i Statoil? : en casestudie av enheten Boring og Brønn

    OpenAIRE

    Olden, Silje

    2012-01-01

    Denne masterutredningen tar for seg organisasjonskulturen innenfor enheten Boring og Brønn (D&W) og i hvilken betydning den har for måten Integrerte Operasjoner (heretter IO) håndteres i Statoil. I forskning som omhandler integrasjon blir dette definert som atskilte og uavhengige deler i én organisasjon som sammen utgjør en helhet (Barki & Pinsonneault, 2005). Tidligere studier av Statoil har funnet at hensyn til kultur er viktig når to ulike parter som Statoil og Hydro skal integreres til et...

  8. Piston pin noise. Quantification and assessment of the influence of pin and pin bore geometry; Kolbenbolzengeraeusch. Verfahren zur Quantifizierung und Einfluss der Nabengeometrie

    Energy Technology Data Exchange (ETDEWEB)

    Werkmann, M.; Tunsch, M.; Kuenzel, R. [Mahle International GmbH, Stuttgart (Germany)

    2005-07-01

    The irregular appearance of noise which is caused by the interaction of piston pin and piston pin boss is subjectively perceived as strongly annoying. For a gasoline engine with floating pin desing the effect of shock excitation related to pin and pin boss on airborne and structure-borne noise will be shown in dependency on water temperature and engine speed. The measurement procedure for detecting piston pin noise as well as the evaluation method for quantification in the time range will be described. Using examples the influence of different parameters on piston pin noise like pin fitting clearance and various pin bore geometries will be presented.

  9. Ecological studies of wood-boring bivalves in the vicinity of the Oyster Creek Nuclear Generating Station. Quarterly progress report 1 Dec 80-28 Feb 81

    Energy Technology Data Exchange (ETDEWEB)

    Hoagland, K.E.; Crocket, L.

    1981-08-01

    The species composition, distribution, and population dynamics of wood-boring bivalves are being studied in the vicinity of the Oyster Creek Nuclear Generating Station, Barnegat Bay, New Jersey. Untreated wood test panels are used to collect organisms at 12 stations. Physiological tolerances of 3 species are also under investigation in the laboratory. Relative destructiveness and competition among the species are being analyzed. The native species Teredo navalis and Bankia gouldi coexist with the introduced T. bartschi in Oyster Creek and at the mouth of Forked River. An increase in mortality occurred in January. By February, Teredo bartschi was found only at Bayside.

  10. Ecological studies of wood-boring bivalves in the vicinity of the Oyster Creek Nuclear Generating Station. Quarterly report, 1 September-30 November 1980

    Energy Technology Data Exchange (ETDEWEB)

    Hoagland, K.E.; Crocket, L.

    1981-04-01

    The species composition, distribution, and population dynamics of wood-boring bivalves are being studied in the vicinity of the Oyster Creek Nuclear Generating Station, Barnegat Bay, New Jersey. Untreated wood test panels are used to collect organisms at 12 stations. Physiological tolerances of 3 species are also under investigation in the laboratory. Relative destructiveness and competition among the species are being analyzed. The native species Teredo navalis and Bankia gouldi coexist with the introduced T. bartschi in Oyster Creek and at the mouth of Forked River.

  11. Ecological studies of wood-boring bivalves in the vicinity of the Oyster Creek Nuclear Generating Station. Progress report 1 Jun-31 Aug 80

    International Nuclear Information System (INIS)

    The species composition, distribution, and population dynamics of wood-boring bivalves are being studied in the vicinity of the Oyster Creek Nuclear Generating Station, Barnegat Bay, New Jersey. Untreated wood test panels are used to collect organisms at 12 stations. Physiological tolerances of 3 species are also under investigation in the laboratory. Relative destructiveness and competition among the species are being analyzed. The native species Teredo navalis and Bankia gouldi coexist with the introduced T. bartschi in Oyster Creek. Teredo bartschi can withstand higher temperatures than the native species, but all species suffer osmotic stress at 6 parts per thousand by weight

  12. Ecological studies of wood-boring bivalves in the vicinity of the Oyster Creek Nuclear Generating Station. Progress report 1 Jun-31 Aug 80

    Energy Technology Data Exchange (ETDEWEB)

    Hoagland, K.E.; Crocket, L.

    1981-02-01

    The species composition, distribution, and population dynamics of wood-boring bivalves are being studied in the vicinity of the Oyster Creek Nuclear Generating Station, Barnegat Bay, New Jersey. Untreated wood test panels are used to collect organisms at 12 stations. Physiological tolerances of 3 species are also under investigation in the laboratory. Relative destructiveness and competition among the species are being analyzed. The native species Teredo navalis and Bankia gouldi coexist with the introduced T. bartschi in Oyster Creek. Teredo bartschi can withstand higher temperatures than the native species, but all species suffer osmotic stress at 6 parts per thousand by weight.

  13. Determination of the availability of appropriate aged flight rocket motors. [captive tests to determine case bond separation and grain bore cracking

    Science.gov (United States)

    Martin, P. J.

    1974-01-01

    A program to identify surplus solid rocket propellant engines which would be available for a program of functional integrity testing was conducted. The engines are classified as: (1) upper stage and apogee engines, (2) sounding rocket and launch vehicle engines, and (3) jato, sled, and tactical engines. Nearly all the engines were available because their age exceeds the warranted shelf life. The preference for testing included tests at nominal flight conditions, at design limits, and to establish margin limits. The principal failure modes of interest were case bond separation and grain bore cracking. Data concerning the identification and characteristics of each engine are tabulated. Methods for conducting the tests are described.

  14. Determination of Organic Acids in Apple and Cider by Liquid Chromatography with ordinary and narrow-bore columns. A Comparative Study

    OpenAIRE

    Blanco-Gomis, Domingo; Morán, M.J. (María); Gutiérrez, M.D. (María); Mangas, J.J. (Juan)

    2013-01-01

    Two narrow-bore columns packed with octadecylsilane of various particle sizes were used to compare their efficiency for the separation of organic acids in apple and cider with that of ordinary columns. The best simultaneous resolution of quinic, malic, shikimic, lactic, acetic, citric and succinic acid was accomplished by using a 100 × 2.1 mm ID, 3-μm Spherisorb ODS-2 column and a phosphate buffer as the mobile phase. This chromatographic system provided a separation efficiency comparable to ...

  15. Suppression of transverse ablative Rayleigh-Taylor-like instability in the hole-boring radiation pressure acceleration by using elliptically polarized laser pulses

    CERN Document Server

    Wu, Dong; Qiao, B; Zhou, C T; Yan, X Q; Yu, M Y; He, X T

    2014-01-01

    It is shown that the transverse Rayleigh-Taylor-like (RT) instability in the hole boring radiation pressure acceleration can be suppressed by using elliptically polarized (EP) laser. A moderate ${J}\\times{B}$ heating of the EP laser will thermalize the local electrons, which leads to the transverse diffusion of ions, suppressing the short wavelength perturbations of RT instability. A proper condition of polarization ratio is obtained analytically for the given laser intensity and plasma density. The idea is confirmed by two dimensional Particle-in-Cell simulations, showing that the ion beam driven by the EP laser is more concentrated and intense compared with that of the circularly polarized laser.

  16. A study on the hydrodynamic characteristics of the Qiantang tidal bore based on field data%基于实测资料的钱塘江涌潮水动力学特性研究

    Institute of Scientific and Technical Information of China (English)

    谢东风; 潘存鸿; 陆波; 叶小凡

    2012-01-01

    Based on the several field measurements of tidal bore on the Qiantang Estuary in recent years, the hydrodynamic characteristics of the tidal bore have been researched. The distributions of tidal levels, flood and ebb durations and current velocities along the river were influenced distinctly by the large sandbar of the estuary. During spring tide the vertical profiles of current velocities were parabolic at the bore arrival and this lasted for one hour, and then the vertical profiles turned to be logarithmic. During neap and middle tides, velocity vertical profiles were logarithmic at both flood and ebb tides. The vertical velocities were smaller by one order of magnitude than those of horizontal velocities, when the bore arrived, the vertical velocity increased obviously. The heights of the bore fronts have positive relationship with local tidal ranges. The Froude numbers at the bore arrival were calculated and the results showed that the Froude number could be used to justify the forms of the tidal bore. Furthermore, an analytic formula was built to analyze the gradient of the water surface of the bore front, by which the water surface changes during the tidal bore passing by were reproduced.%基于近年来钱塘江河口三次涌潮观测资料,系统分析了钱塘江涌潮的水动力学特性,计算了涌潮到达时刻的Froude数,结果显示可用Froude数判别涌潮形态,并建立了计算涌潮潮头陡度的解析公式,复演了涌潮到达时潮头陡度急剧增加的过程.研究表明:涌潮的沿程潮位、涨落潮历时和流速等特性受河口沙坎地形影响明显;流速的垂线分布大潮期间在潮到后一小时内以抛物线分布为主,其余时间以对数分布为主,而在中小潮时涨、落潮阶段均以对数分布为主;垂向流速比纵向流速小一个量级,当涌潮到达时刻急剧增大;潮头高度与当地潮差存在良好的正相关关系.

  17. Development and demonstration of prototype transportation equipment for emplacing HL vitrified waste canisters into small diameter bored horizontal disposal cells

    International Nuclear Information System (INIS)

    Docking Table, the Disposal Cell Mouth equipment and a full scale (100 m long) test bench, in addition to the Dummy Canister and a second generation Pushing Robot. The successful completion of the test campaign associated with the first prototype P1 confirmed the feasibility of emplacing 2 tonne/0.6 m diameter waste packages (canisters) containing long lived HLW in 40 m long horizontal bore holes (disposal cells) with only minimal annular clearance between the canister and the disposal cell liner. Preliminary testing of the second prototype P2 indicates that proper docking onto the cell mouth, followed by emplacement in 80 to 100 m long disposal cells, is possible. The developed technology is considered to be mature enough for a potential industrial application. The 2 prototypes (the 2nd and 3rd phases of the work) were executed within the framework of the ESDRED Project (Engineering Studies and Demonstration of Repository Designs) which is co-funded by the European Commission as part of the sixth EURATOM Research and Training Framework Programme (FP6) on nuclear energy (2002 - 2006). (author)

  18. Proposal for the award of a contract for the supply of seamless austenitic stainless steel tubes for the cold bores of the LHC main magnets

    CERN Document Server

    2000-01-01

    This document concerns the award of a contract for the supply of 3 542 seamless austenitic stainless steel tubes of different types for the cold bores of the LHC main magnets. A call for tenders (IT-2525/LHC/LHC) was sent on 8 August 2000 to 24 firms in ten Member States. By the closing date, CERN had received two tenders from two firms in two Member States. The Finance Committee is invited to agree to the negotiation of a contract with the firm DMV (IT), the only bidder complying with the specification, for the supply of 3 542 seamless stainless steel tubes for the cold bores of the LHC main magnets for a total amount of 6 959 813 Swiss francs, subject to revision for contractual deliveries after 31 December 2002, with an option for the supply of up to 15% additional seamless stainless steel tubes for an amount of 1 043 972 Swiss francs, subject to revision for contractual deliveries after 31 December 2002, bringing the total amount to a maximum of 8 003 785 Swiss francs, subject to revision for contractual ...

  19. Formation of undular bores and solitary waves in the Strait of Malacca caused by the 26 December 2004 Indian Ocean tsunami

    Science.gov (United States)

    Grue, J.; Pelinovsky, E. N.; Fructus, D.; Talipova, T.; Kharif, C.

    2008-05-01

    Deformation of the Indian Ocean tsunami moving into the shallow Strait of Malacca and formation of undular bores and solitary waves in the strait are simulated in a model study using the fully nonlinear dispersive method (FNDM) and the Korteweg-deVries (KdV) equation. Two different versions of the incoming wave are studied where the waveshape is the same but the amplitude is varied: full amplitude and half amplitude. While moving across three shallow bottom ridges, the back face of the leading depression wave steepens until the wave slope reaches a level of 0.0036-0.0038, when short waves form, resembling an undular bore for both full and half amplitude. The group of short waves has very small amplitude in the beginning, behaving like a linear dispersive wave train, the front moving with the shallow water speed and the tail moving with the linear group velocity. Energy transfer from long to short modes is similar for the two input waves, indicating the fundamental role of the bottom topography to the formation of short waves. The dominant period becomes about 20 s in both cases. The train of short waves, emerging earlier for the larger input wave than for the smaller one, eventually develops into a sequence of rank-ordered solitary waves moving faster than the leading depression wave and resembles a fission of the mother wave. The KdV equation has limited capacity in resolving dispersion compared to FNDM.

  20. Narrow-bore HPLC-ICP-MS for speciation of copper in mutant mouse neonates bearing a defect in Cu metabolism

    Energy Technology Data Exchange (ETDEWEB)

    Miyayama, Takamitsu; Ogra, Yasumitsu; Osima, Yousuke; Suzuki, Kazuo T. [Chiba University, Graduate School of Pharmaceutical Sciences, Chiba (Japan)

    2008-04-15

    Minute amounts of tissue supernatants from mouse neonates bearing a mutation in the copper (Cu)-transporter gene, Atp7a, were injected into narrow-bore HPLC coupled with an inductively coupled plasma-mass spectrometer (ICP-MS) to examine Cu metabolism. In the 14-day-old mutant neonates, Cu accumulated in the intestine in the metallothionein (MT)-bound form, and mRNA expression of the two MT isoforms was increased. Meanwhile, Cu in the MT-bound form (Cu-MT) was depleted in the liver and mRNA expression decreased in comparison with wild-type mice. These results suggest that Cu is not secreted by intestinal microvillus cells into bloodstream due to the defect of Atp7a, and systemic depletion of Cu occurred. On the other hand, in the kidneys of mutant mice, Cu accumulated in the MT-bound form despite the fact that mRNA expression of the two MT isoforms was low. Part of Cu-MT in microvillus cells may be released into bloodstream at turnover and be preferably taken up by the kidneys. Consequently, the mRNA expression of MT isoforms was not always coincident with the amounts of MT proteins binding Cu, and narrow bore HPLC-ICP-MS used for MT protein determination is a complementary technique to real-time RT-PCR used for MT mRNA determination in Cu speciation. (orig.)

  1. Distribution of radioactive nuclides of boring core samples extracted from concrete structures of reactor buildings in the Fukushima Daiichi Nuclear Power Plant

    International Nuclear Information System (INIS)

    Since the start of the severe accidents at the Fukushima Daiichi Nuclear Power Plant in March 2011, concrete surfaces within the reactor buildings (RBs) have been exposed to radioactive contaminants. Released radionuclides still remain too high to permit entry into some areas of the RBs to allow the damage to be assessed and to allow carrying out the restoration of lost safety functions, decommissioning activities, etc. In order to clarify the situation of this contamination in the RBs of Units 1, 2 and 3, samples of contaminants were collected and subjected to analyses to determine the surface radionuclide concentrations and to characterize the radionuclide distributions in the samples. Especially, decontamination tests on the boring core sample of Unit 2 were conducted to quantitatively determine the effectiveness of several basic decontamination techniques. As a result of the tests, the level of radioactivity of this sample was reduced with the removal of ∼97% of the contamination present near the sample surface, and it was confirmed for the boring core sample that the contamination mainly had the characteristics of fixed contamination of the surface. (author)

  2. Some problems on the research and development of the application of methane draining boring technology to prevent hazards in underground coal mines in Vietnam

    Institute of Scientific and Technical Information of China (English)

    NGUYEN Xuan-Thao; NGUYEN Tran-Tuan; TRAN Dinh-Kien

    2009-01-01

    Underground coal mining activities in the Quangninh coal basin (in the North of Vietnam) have been carried out at a depth of-130 m to -150 m, and in the near future this mining depth will become -300 m and -500 m. Together with the increasing coal output, the quantity of methane and other mine gases emitted from coal beds during mining activi-ties will grow bigger and bigger. According to the forecast of the coal mining industry, if mines go deeper downward, all underground coal mines in the Quangninh basin will be classified into the mine group with the dangerous level of methane bearings. Mine gas control and management operations with conventional ventilation are less effective and entail high expenses. One of the main solutions is to carry out short, medium and long boreholes for controlling and recovering methane and other mine gases from coal beds before mining activities. Efficiency of drilling activities for methane gas recovery from coal seams with horizontal bore holes at underground coal mines depends on many factors in-cluding the mine gas draining borehole layout at the roadways, gas content in the coal beds, technologies for mine gas draining boring activities, and so on. Methane gas exists in the coal beds under the adhesive state with stable physical and chemical bonds. In or-der to recover these gases, it is necessary to carry out boreholes and create artificial joints (collecting pits) in coal beds with the impulse method (hydraulic separation method).

  3. Model of a 80 K liner vacuum system for the 4.2 K cold bore of the SSCL 20 TeV proton collider

    International Nuclear Information System (INIS)

    In this paper we discuss a model for an 80 K liner system for the beam tube vacuum of the Superconducting Super Collider (SSC). The liner is a coaxial perforated tube fitting inside the ∼4.2 K bore tube of the SSC magnet cryostats. A liner of this type is useful for pumping the gas desorbed by synchrotron radiation out of the view of the radiation and for decoupling the beam current from the 4.2 K refrigeration plant capacity. Addition of cryosorber on the bore tube (e.g., charcoal) greatly increases the H2 sorption capacity compared to the bare metal surface, thus lengthening the time between beam tube warmups. The model equations are useful for estimating the performance of the beam tube vacuum and for defining the experimental information necessary to make a prediction. Some analysis is also presented for 4.2 K and 20 K liners and a simple 4.2 K beam tube without a liner

  4. Assessment of U(nat) and 226Ra level in bore well water adjoining the newly constructed uranium mill tailings pond at Turamdih

    International Nuclear Information System (INIS)

    Processing of uranium ore leaves behind large quantity of low specific activity waste called tailings. In the absence of appropriate control measures such waste disposal may lead to contamination of adjoining ground water sources. Ten bore wells have been constructed across the earthen bund of the tailings pond to evaluate the migration characteristics of radionuclides and chemical toxicants. Present study is based on the monitoring results of significant radionuclides U(nat) and 226Ra of these bore well water during the last two years. The highest concentration of U(nat) and 226Ra was found 2.4 mg m-3 and 22.1 Bq m-3 respectively. These levels are comparable with the ground water sources situated in the vicinity of the tailings pond and adjacent areas within the same geological formation. The levels reflect the natural distribution of U(nat) and 226Ra in ground water sources of this region and impact of discharges at tailings pond has not been observed so far. The study reveal that the design features of tailings pond is able to restrict these radionuclides within the tailings pile. Moreover, the levels are well below the recommended standards of U(nat) and 226Ra for drinking water i.e. 60 mg m-3 and 300 Bq m-3. (author)

  5. In situ stress determination by the overcoring of large surface strain gauge rosettes on the walls of a raise-bored shaft at the Underground Research Laboratory

    International Nuclear Information System (INIS)

    AECL Research is conducting a series of experiments to examine the influence of scale on measured in situ stresses in granite rock. The ventilation raise rosette overcoring experiment is one such test. This experiment, modelled on a previous test conducted in Australia, consisted of overcoring four 120-mm strain gauge rosettes glued to the surface of a 1.8-m-diameter bored raise. The in situ stresses were calculated from the measured strains using the equations for stresses around a cylindrical excavation in an elastic material. The possibility of excavation disturbance around the ventilation raise was investigated using overcore stress measurements, elastic modulus tests on retrieved core, and visual inspection of thin sections obtained from removed core. The effect of a stress-dependent elastic modulus (referred to as non-linear elastic behaviour) is also addressed. Results from the ventilation raise rosette overcoring experiment suggest that rosette overcoring in a bored raise is an acceptable stress-measurement method. The effects of scale and excavation damage on the stress measurements were not considered to be significant; however, if the elastic modulus of the rock is strongly stress-dependent, non-linear elastic behaviour may have a small effect on the measured stresses

  6. 桥梁钻孔灌注桩施工技术和质量控制%Bridge Bored Pile Construction Technology and Quality Control

    Institute of Scientific and Technical Information of China (English)

    孙海朝

    2012-01-01

    公路桥梁领域广泛地应用钻孔灌注桩基础,因为此种基础具有成本低、适应性强、施工简便等优点.因为桥梁钻孔灌注桩的施工大部分是在水下进行的,所以灌注桩属于隐蔽工程,成形后不能进行开挖验收,施工过程中也无法观察.整个工程的质量和进度都会因为在施工中某个环节出现问题时而受到直接影响,严重的会造成不良的社会影响,给投资者带来巨大的经济损失.因此,要求基础施工队伍加强施工质量管理,落实施工技术措施,施工过程中每一个环节的质量要注意抓好,并且针对灌注桩的质量通病进行分析后,为便于有效地控制桩基施工质量,提前制订出施工质量标准、验收实施方案和每根桩的施工记录.%As bored pile foundation have the advantages such as low cost, strong adaptability, and easy construction etc., it is widely used in highway and bridge field. Because most of its construction is underwater, the construction of bored pile is concealed work, it can not be excavated and checked after forming, and it can not be inspected in construction. If the problem appeared in any of links, the quality and schedule of the whole project would be effected, even causes bad social influence, which brings large economic lost to investor. So we require worker to strengthen construction quality management, implement the construction technique measures, and control construction quality at each link. After analyzing the common failings of bored piles, the construction quality standards, acceptance implementation plan and construction record of every root pile should be pre-decided for easy to effectively control the quality of pile foundation construction.

  7. Enhanced production of electron cyclotron resonance plasma by exciting selective microwave mode on a large-bore electron cyclotron resonance ion source with permanent magnet

    International Nuclear Information System (INIS)

    We are constructing a tandem type ECRIS. The first stage is large-bore with cylindrically comb-shaped magnet. We optimize the ion beam current and ion saturation current by a mobile plate tuner. They change by the position of the plate tuner for 2.45 GHz, 11–13 GHz, and multi-frequencies. The peak positions of them are close to the position where the microwave mode forms standing wave between the plate tuner and the extractor. The absorbed powers are estimated for each mode. We show a new guiding principle, which the number of efficient microwave mode should be selected to fit to that of multipole of the comb-shaped magnets. We obtained the excitation of the selective modes using new mobile plate tuner to enhance ECR efficiency

  8. Ecological studies of wood-boring bivalves in the vicinity of the Oyster Creek Nuclear Generating Station. Interim report 1 Sep 79-28 Feb 80

    Energy Technology Data Exchange (ETDEWEB)

    Hoagland, K.E.; Crocket, L.; Turner, R.D.

    1980-11-01

    The species composition, distribution, and population dynamics of wood-boring bivalves are being studied in the vicinity of the Oyster Creek Nuclear Generating Station, Barnegat Bay, New Jersey. Untreated wood test panels are used to collect organisms at 12 stations. Physiological tolerances of 3 species are also under investigation in the laboratory. Relative destructiveness and competition among the species are being analyzed. Teredo bartschi caused almost complete destruction of panels in Oyster Creek during the summer of 1979. Reproduction and settlement of this species continued into October. The native species Teredo navalis and Bankia gouldi coexist with T. bartschi in Oyster Creek. The greatest shipworm damage is in Oyster Creek. Heavy mortality occurs in all species during winter, especially in winters such as 1979-80 when the generating station is not operating. Adults of all three species can survive for at least 30 days at salinities from 5 to 45 parts per thousand by weight. They can withstand abrupt salinity changes.

  9. Ecological studies of wood-boring bivalves in the vicinity of the Oyster Creek Nuclear Generating Station. Progress report, December 1981-February 1982

    International Nuclear Information System (INIS)

    The species composition, distribution, and population dynamics of wood-boring bivalves are being studied in the vicinity of the Oyster Creek Nuclear Generating Station, Barnegat Bay, New Jersey. Untreated wood test panels are used to collect organisms at 12 stations. Physiological tolerances of 3 species are also under investigation in the laboratory. Competition among the species is being analyzed. In the winter of 1981, the generating station experienced a prolonged outage. The reproductive cycle of the shipworms was not extended. Teredo bartschi was very abundant at one station in Oyster Creek and moderately abundant at a second, but did not exist elsewhere in Barnegat Bay. Some specimens of Teredo bartschi contained larvae in the gills in February. According to laboratory experiments, Teredo navalis is able to remain active at temperatures as low as 40C, whereas T. bartschi ceases activity (withdraws its siphons) at about 130C. 12 tables

  10. Ecological studies of wood-boring bivalves in the vicinity of the Oyster Creek Nuclear Generating Station. Progress report, March-May 1982

    Energy Technology Data Exchange (ETDEWEB)

    Hoagland, K.E.

    1982-11-01

    The species composition, distribution, and population dynamics of wood-boring bivalves are being studied in the vicinity of the Oyster Creek Nuclear Generating Station, Barnegat Bay, New Jersey. Untreated wood test panels are used to collect organisms at 12 stations. Physiological tolerances of 3 species are also under investigation in the laboratory. Competition among the species is being analyzed. The adult population of Teredo bartschi survived the winter and spring of 1981-1982 better than it did previous cold periods without a thermal effluent. Lack of an effluent was due to a prolonged outage of the generating station. There was no spring outbreak of shipworms. The introduced species appears established at one station near but outside of Oyster Creek. Three teredinid species coexist in Oyster Creek. Larvae of T. bartschi and T. navalis have similar responses to reduced salinity. Bankia gouldi is the fastest-growing of the teredinids found in New Jersey, and as the lowest annual mortality.

  11. Ecological studies of wood-boring bivalves in the vicinity of the Oyster Creek Nuclear Generating Station. Progress report, 1 March-31 May 1980

    Energy Technology Data Exchange (ETDEWEB)

    Hoagland, K.E.; Crocket, L.

    1980-12-01

    The species composition, distribution, and population dynamics of wood-boring bivalves are being studied in the vicinity of the Oyster Creek Nuclear Generating Station, Barnegat Bay, New Jersey. Untreated wood test panels are used to collect organisms at 12 stations. Physiological tolerances of 3 species are also under investigation in the laboratory. The native species Teredo navalis and Bankia gouldi coexist with the introduced T. bartschi in Oyster Creek, at the mouth of Forked River and on the coast of the bay between the two creeks. Heavy mortality occurred in all species during winter and spring when the generating station was not operating. Temperature and salinity tolerance tests begun during April and May, 1980, were not completed by the end of May because the adult shipworms proved to be very resistant to drastic changes in these physical parameters.

  12. Ecological studies of wood-boring bivalves in the vicinity of the Oyster Creek Nuclear Generating Station. Progress report, December 1981-February 1982

    Energy Technology Data Exchange (ETDEWEB)

    Hoagland, K.E.; Crocket, L.

    1982-08-01

    The species composition, distribution, and population dynamics of wood-boring bivalves are being studied in the vicinity of the Oyster Creek Nuclear Generating Station, Barnegat Bay, New Jersey. Untreated wood test panels are used to collect organisms at 12 stations. Physiological tolerances of 3 species are also under investigation in the laboratory. Competition among the species is being analyzed. In the winter of 1981, the generating station experienced a prolonged outage. The reproductive cycle of the shipworms was not extended. Teredo bartschi was very abundant at one station in Oyster Creek and moderately abundant at a second, but did not exist elsewhere in Barnegat Bay. Some specimens of Teredo bartschi contained larvae in the gills in February. According to laboratory experiments, Teredo navalis is able to remain active at temperatures as low as 4/sup 0/C, whereas T. bartschi ceases activity (withdraws its siphons) at about 13/sup 0/C. 12 tables.

  13. Production of electron cyclotron resonance plasma by using multifrequencies microwaves and active beam profile control on a large bore electron cyclotron resonance ion source with permanent magnets

    International Nuclear Information System (INIS)

    A new concept on magnetic field with all magnets on plasma production and confinement has been proposed to enhance efficiency of an electron cyclotron resonance (ECR) plasma for broad and dense ion beam source under the low pressure. The magnetic field configuration is constructed by a pair of magnets assembly, i.e., comb-shaped magnet which cylindrically surrounds the plasma chamber. The resonance zones corresponding to the fundamental ECR for 2.45 GHz and 11-13 GHz frequencies are constructed at different positions. The profiles of the plasma parameters in the ECR ion source are different from each frequency of microwave. Large bore extractor is set at the opposite side against the microwave feeds. It is found that differences of their profiles also appear at those of ion beam profiles. We conducted to launch simultaneously multiplex frequencies microwaves controlled individually, and tried to control the profiles of the plasma parameters and then those of extracted ion beam.

  14. Stabilizing transverse ablative Rayleigh Taylor like instability by using elliptically polarized laser pulses in the hole-boring radiation pressure acceleration regime

    CERN Document Server

    Wu, Dong; Zhou, C T; Yan, X Q; Yu, M Y; He, X T

    2012-01-01

    It is shown that the transverse Rayleigh Taylor like instability can be well stabilized by using elliptically polarized laser in the hole boring radiation pressure acceleration regime. The $\\bm{J}\\times\\bm{B}$ effect of the laser will thermalize the local electrons and support a transverse diffusion mechanism of the ions, resulting in the stabilization of the short wavelength perturbations, which is quite similar to the ablative Rayleigh Taylor instability in the initial confinement fusion research. The proper range of polarization ratio is obtained from a theoretical model for the given laser intensity and plasma density. The stabilization mechanism is well confirmed by two dimensional Particle-in-Cell simulations, and the ion beam driven by the elliptically polarized laser is more concentrated and intense compared with that of the circularly polarized laser.

  15. 漕河渡槽钻孔灌注桩施工及处理措施%Construction and Treatment Measures of Bored Pile in Caohe River Aqueduct

    Institute of Scientific and Technical Information of China (English)

    2013-01-01

    There are 608 bored concrete piles (1.5 meter in the diameter) in Caohe aqueduct, the problems are inevitable in the construction, such as hole wall collapse, pipe blockage and steel reinforcement cage floating,etc. The article collects the problems often encountered in the construction of the pile foundation, and puts forward the preventive measures.%  中漕河渡槽共计采用608根直径1.5m混凝土灌注桩,施工过程中曾发生孔壁坍塌、导管堵塞、钢筋笼上浮等问题,本文对发生的问题和处理方法进行了汇总,提出了预防措施。

  16. Quality assessment in in vivo NMR spectroscopy: V. Multicentre evaluation of prototype test objects and protocols for performance assessment in small bore MRS equipment

    DEFF Research Database (Denmark)

    Howe, F.A.; Canese, R; Podo, F;

    1995-01-01

    using ISIS as volume localization sequence in 31P MRS. The results suggested the interest of adopting some of these prototypes for improving the comparison of spectroscopy data obtained from different sites, for providing useful means of quality assurance in experimental MRS, and facilitating the......This paper reports the results of multicentre studies aimed at designing, constructing, and evaluating prototype test objects for performance assessment in small-bore MRS systems, by utilizing the test protocols already proposed by the EEC COMAC-BME Concerted Action for clinical MRS equipment....... Three classes of test objects were considered: (1) a multicompartment test object for 31P MRS measurements performed with slice-selective sequences; (2) a two-compartment test object for volume-selection 1H MRS; and (3) two-compartment test objects for assessing the performance of experimental systems...

  17. Study of a transaugmented two-stage small circular-bore railgun for injection of hypervelocity hydrogen pellets as a fusion reactor refueling mechanism

    Energy Technology Data Exchange (ETDEWEB)

    Tompkins, M.W.; Anderson, M.A.; Feng, Q.; Zhang, J.; Kim, K. [Univ. of Illinois, Urbana, IL (United States)

    1997-01-01

    Injection of hypervelocity hydrogen pellets has become widely accepted as the most effective means of refueling magnetically confined fusion reactors. Pellet velocities on the order of 10 km/s are desired and hydrogen pellet erosion during acceleration must be minimized. It is important to maintain uniform bore surfaces during repetitive shots, implying that, if a railgun is to be used to accelerate the pellets, damage to the sidewalls and rails of the railgun due to local heating must be limited. In order to reduce the amount of power dissipated within the bore and increase the propulsive force generated by the plasma-arc armature while minimizing losses due to pellet, rail, and sidewall ablation, the authors have employed a magnetic field transaugmentation mechanism consisting of a two-turn pulsed electromagnet. The two-stage gun consists of a light-gas gun which accelerates a 4- to 5-mg pellet to a speed around 1.2 km/s and injects it into the plasma-arc armature railgun. Currently, they have achieved a final output velocity for a hydrogen pellet of 2.11 km/s with a time-averaged acceleration of 4,850 km/s{sup 2} using a 58-cm railgun pulsed with a peak rail current of 9.2 kA and 28.0 kA of transaugmentation current. This paper will present a description of the hydrogen-pellet-injector railgun system, a discussion of the data on hydrogen pellet acceleration, and projections for future systems.

  18. Test-retest reliability of automated whole body and compartmental muscle volume measurements on a wide bore 3T MR system

    International Nuclear Information System (INIS)

    To measure the test-retest reproducibility of an automated system for quantifying whole body and compartmental muscle volumes using wide bore 3 T MRI. Thirty volunteers stratified by body mass index underwent whole body 3 T MRI, two-point Dixon sequences, on two separate occasions. Water-fat separation was performed, with automated segmentation of whole body, torso, upper and lower leg volumes, and manually segmented lower leg muscle volumes. Mean automated total body muscle volume was 19.32 L (SD9.1) and 19.28 L (SD9.12) for first and second acquisitions (Intraclass correlation coefficient (ICC) = 1.0, 95 % level of agreement -0.32-0.2 L). ICC for all automated test-retest muscle volumes were almost perfect (0.99-1.0) with 95 % levels of agreement 1.8-6.6 % of mean volume. Automated muscle volume measurements correlate closely with manual quantification (right lower leg: manual 1.68 L (2SD0.6) compared to automated 1.64 L (2SD 0.6), left lower leg: manual 1.69 L (2SD 0.64) compared to automated 1.63 L (SD0.61), correlation coefficients for automated and manual segmentation were 0.94-0.96). Fully automated whole body and compartmental muscle volume quantification can be achieved rapidly on a 3 T wide bore system with very low margins of error, excellent test-retest reliability and excellent correlation to manual segmentation in the lower leg. (orig.)

  19. Kinematic change of the meniscus and the tibiofemoral joint space in asymptomatic volunteers using a wide bore 3T closed MRI system

    International Nuclear Information System (INIS)

    To evaluate kinematic changes in menisci and tibiofemoral joint spaces in extension and flexion using asymptomatic volunteers using a wide-bore 3-T closed MRI system. Twenty-two knees from asymptomatic volunteers were examined in knee extension and flexion using a 3-T MRI (sagittal 2D FSE T2-weighted sequence and sagittal 3D isotropic FSE proton density-weighted cube sequence). The meniscal positions, meniscal floating and flounce were evaluated. The widths of the medial and lateral tibiofemoral joint spaces and coronal tibiofemoral angles were measured. In the anteroposterior direction, meniscal extrusion was most frequently seen in the anterior horn of the medial menisci (100 %) in extensions (maximum 6.04 mm). Most of the menisci moved significantly to the posterior side from extension to flexion. The anteroposterior meniscal movement was the greatest for the anterior horn of the medial meniscus and least for the posterior horn of the medial meniscus. In the mediolateral direction, meniscal extrusion was seen in 52 % of the medial menisci in extensions (maximum 1.91 mm) and 29 % of lateral menisci in flexions (maximum 2.36 mm). From the extension to flexion, all medial and lateral menisci moved significantly to the lateral side. Meniscal floating was frequently observed in the posterior horn of medial menisci in extension. Meniscal flounce was frequently seen in lateral menisci in flexion with a widened lateral tibiofemoral joint space gap. The coronal tibiofemoral angle showed medial wedging in flexion, but not in extension. Wide-bore 3-T closed MRI revealed significant kinematic changes in the menisci and tibiofemoral joint spaces in asymptomatic volunteers. (orig.)

  20. MR-sequences for prostate cancer diagnostics: validation based on the PI-RADS scoring system and targeted MR-guided in-bore biopsy

    International Nuclear Information System (INIS)

    This study evaluated the accuracy of MR sequences [T2-, diffusion-weighted, and dynamic contrast-enhanced (T2WI, DWI, and DCE) imaging] at 3T, based on the European Society of Urogenital Radiology (ESUR) scoring system [Prostate Imaging Reporting and Data System (PI-RADS)] using MR-guided in-bore prostate biopsies as reference standard. In 235 consecutive patients [aged 65.7 ± 7.9 years; median prostate-specific antigen (PSA) 8 ng/ml] with multiparametric prostate MRI (mp-MRI), 566 lesions were scored according to PI-RADS. Histology of all lesions was obtained by targeted MR-guided in-bore biopsy. In 200 lesions, biopsy revealed prostate cancer (PCa). The area under the curve (AUC) for cancer detection was 0.70 (T2WI), 0.80 (DWI), and 0.74 (DCE). A combination of T2WI + DWI, T2WI + DCE, and DWI + DCE achieved an AUC of 0.81, 0.78, and 0.79. A summed PI-RADS score of T2WI + DWI + DCE achieved an AUC of 0.81. For higher grade PCa (primary Gleason pattern ≥ 4), the AUC was 0.85 for T2WI + DWI, 0.84 for T2WI + DCE, 0.86 for DWI + DCE, and 0.87 for T2WI + DWI + DCE. The AUC for T2WI + DWI + DCE for transitional-zone PCa was 0.73, and for the peripheral zone 0.88. Regarding higher-grade PCa, AUC for transitional-zone PCa was 0.88, and for peripheral zone 0.96. The combination of T2WI + DWI + DCE achieved the highest test accuracy, especially in patients with higher-grade PCa. The use of ≤2 MR sequences led to lower AUC in higher-grade and peripheral-zone cancers. (orig.)

  1. Exergy analysis of a two-stage ground source heat pump with a vertical bore for residential space conditioning under simulated occupancy

    International Nuclear Information System (INIS)

    Highlights: • Exergy and energy analysis of a vertical-bore ground source heat pump over a 12-month period is presented. • The ground provided more than 75% of the heating energy. • Performance metrics are presented. • Sources of systemic inefficiency are identified and prioritized using Exergy analysis. • Understanding performance metrics is vital for judicial use of renewable energy. - Abstract: This twelve-month field study analyzes the performance of a 7.56 W (2.16-ton) water-to-air-ground source heat pump (WA-GSHP) to satisfy domestic space conditioning loads in a 253 m2 house in a mixed-humid climate in the United States. The practical feasibility of using the ground as a source of renewable energy is clearly demonstrated. Better than 75% of the energy needed for space heating was extracted from the ground. The average monthly electricity consumption for space conditioning was only 40 kW h at summer and winter thermostat set points of 24.4 °C and 21.7 °C, respectively. The WA-GSHP shared the same 94.5 m vertical bore ground loop with a separate water-to-water ground-source heat pump (WW-GSHP) for meeting domestic hot water needs in the same house. Sources of systemic irreversibility, the main cause of lost work, are identified using Exergy and energy analysis. Quantifying the sources of Exergy and energy losses is essential for further systemic improvements. The research findings suggest that the WA-GSHPs are a practical and viable technology to reduce primary energy consumption and greenhouse gas emissions under the IECC 2012 Standard, as well as the European Union (EU) 2020 targets of using renewable energy resources

  2. Kinematic change of the meniscus and the tibiofemoral joint space in asymptomatic volunteers using a wide bore 3T closed MRI system

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Eugene; Kim, Yeo Ju; Kim, Mi Young; Cho, Soon Gu [Inha University Hospital, Department of Radiology, Choong-gu, Incheon (Korea, Republic of); Cha, Jang Gyu [Soonchunhyang University Hospital, Department of Radiology, Bucheon (Korea, Republic of); Lee, Dae Hyung [Inha University Hospital, Clinical Trail Center, Incheon (Korea, Republic of); Kim, Ryuh Sup [Inha University Hospital, Department of Orthopedic Surgery, Incheon (Korea, Republic of)

    2015-10-15

    To evaluate kinematic changes in menisci and tibiofemoral joint spaces in extension and flexion using asymptomatic volunteers using a wide-bore 3-T closed MRI system. Twenty-two knees from asymptomatic volunteers were examined in knee extension and flexion using a 3-T MRI (sagittal 2D FSE T2-weighted sequence and sagittal 3D isotropic FSE proton density-weighted cube sequence). The meniscal positions, meniscal floating and flounce were evaluated. The widths of the medial and lateral tibiofemoral joint spaces and coronal tibiofemoral angles were measured. In the anteroposterior direction, meniscal extrusion was most frequently seen in the anterior horn of the medial menisci (100 %) in extensions (maximum 6.04 mm). Most of the menisci moved significantly to the posterior side from extension to flexion. The anteroposterior meniscal movement was the greatest for the anterior horn of the medial meniscus and least for the posterior horn of the medial meniscus. In the mediolateral direction, meniscal extrusion was seen in 52 % of the medial menisci in extensions (maximum 1.91 mm) and 29 % of lateral menisci in flexions (maximum 2.36 mm). From the extension to flexion, all medial and lateral menisci moved significantly to the lateral side. Meniscal floating was frequently observed in the posterior horn of medial menisci in extension. Meniscal flounce was frequently seen in lateral menisci in flexion with a widened lateral tibiofemoral joint space gap. The coronal tibiofemoral angle showed medial wedging in flexion, but not in extension. Wide-bore 3-T closed MRI revealed significant kinematic changes in the menisci and tibiofemoral joint spaces in asymptomatic volunteers. (orig.)

  3. Feasibility of diffusion-weighted magnetic resonance imaging in patients with juvenile idiopathic arthritis on 1.0-T open-bore MRI

    Energy Technology Data Exchange (ETDEWEB)

    Barendregt, Anouk M.; Nusman, Charlotte M. [University of Amsterdam, Department of Radiology, Academic Medical Center, Amsterdam (Netherlands); University of Amsterdam, Department of Pediatric Hematology, Immunology, Rheumatology and Infectious Disease, Emma Children' s Hospital AMC, Amsterdam (Netherlands); Hemke, Robert; Lavini, Cristina; Maas, Mario [University of Amsterdam, Department of Radiology, Academic Medical Center, Amsterdam (Netherlands); Amiras, Dimitri [Imperial College Healthcare NHS Trust, Radiology Department, St. Mary' s Hospital, Paddington, London (United Kingdom); Kuijpers, Taco W. [University of Amsterdam, Department of Pediatric Hematology, Immunology, Rheumatology and Infectious Disease, Emma Children' s Hospital AMC, Amsterdam (Netherlands)

    2015-12-15

    To evaluate the feasibility of non-invasive diffusion-weighted imaging (DWI) of the knee of children with juvenile idiopathic arthritis (JIA) and, further, to analyze the apparent diffusion coefficient (ADC) levels to distinguish synovium from effusion. Standard magnetic resonance imaging of the knee including post-contrast imaging was obtained in eight patients (mean age, 12 years 8 months, five females) using an open-bore magnetic resonance imaging system (1.0 T). In addition, axially acquired echo-planar DWI datasets (b-values 0, 50, and 600) were prospectively obtained and the diffusion images were post-processed into ADC{sub 50-600} maps. Two independent observers selected a region of interest (ROI) for both synovium and effusion using aligned post-contrast images as landmarks. Mann-Whitney U test was performed to compare ADC synovium and ADC effusion. DWI was successfully obtained in all patients. When data of both observers was combined, ADC synovium was lower than ADC effusion in the ROI in seven out of eight patients (median, 1.92 x 10{sup -3} mm{sup 2}/s vs. 2.40 x 10{sup -3} mm{sup 2}/s, p = 0.006, respectively). Similar results were obtained when the two observers were analyzed separately (observer 1: p = 0.006, observer 2: p = 0.04). In this pilot study, on a patient-friendly 1.0-T open-bore MRI, we demonstrated that DWI may potentially be a feasible non-invasive imaging technique in children with JIA. We could differentiate synovium from effusion in seven out of eight patients based on the ADC of synovium and effusion. However, to select synovium and effusion on DWI, post-contrast images were still a necessity. (orig.)

  4. MR-sequences for prostate cancer diagnostics: validation based on the PI-RADS scoring system and targeted MR-guided in-bore biopsy

    Energy Technology Data Exchange (ETDEWEB)

    Schimmoeller, Lars; Quentin, Michael; Buchbender, Christian; Antoch, Gerald; Blondin, Dirk [University Dusseldorf, Medical Faculty, Department of Diagnostic and Interventional Radiology, Dusseldorf (Germany); Arsov, Christian; Hiester, Andreas; Rabenalt, Robert; Albers, Peter [University Dusseldorf, Medical Faculty, Department of Urology, Dusseldorf (Germany)

    2014-10-15

    This study evaluated the accuracy of MR sequences [T2-, diffusion-weighted, and dynamic contrast-enhanced (T2WI, DWI, and DCE) imaging] at 3T, based on the European Society of Urogenital Radiology (ESUR) scoring system [Prostate Imaging Reporting and Data System (PI-RADS)] using MR-guided in-bore prostate biopsies as reference standard. In 235 consecutive patients [aged 65.7 ± 7.9 years; median prostate-specific antigen (PSA) 8 ng/ml] with multiparametric prostate MRI (mp-MRI), 566 lesions were scored according to PI-RADS. Histology of all lesions was obtained by targeted MR-guided in-bore biopsy. In 200 lesions, biopsy revealed prostate cancer (PCa). The area under the curve (AUC) for cancer detection was 0.70 (T2WI), 0.80 (DWI), and 0.74 (DCE). A combination of T2WI + DWI, T2WI + DCE, and DWI + DCE achieved an AUC of 0.81, 0.78, and 0.79. A summed PI-RADS score of T2WI + DWI + DCE achieved an AUC of 0.81. For higher grade PCa (primary Gleason pattern ≥ 4), the AUC was 0.85 for T2WI + DWI, 0.84 for T2WI + DCE, 0.86 for DWI + DCE, and 0.87 for T2WI + DWI + DCE. The AUC for T2WI + DWI + DCE for transitional-zone PCa was 0.73, and for the peripheral zone 0.88. Regarding higher-grade PCa, AUC for transitional-zone PCa was 0.88, and for peripheral zone 0.96. The combination of T2WI + DWI + DCE achieved the highest test accuracy, especially in patients with higher-grade PCa. The use of ≤2 MR sequences led to lower AUC in higher-grade and peripheral-zone cancers. (orig.)

  5. Feasibility of diffusion-weighted magnetic resonance imaging in patients with juvenile idiopathic arthritis on 1.0-T open-bore MRI

    International Nuclear Information System (INIS)

    To evaluate the feasibility of non-invasive diffusion-weighted imaging (DWI) of the knee of children with juvenile idiopathic arthritis (JIA) and, further, to analyze the apparent diffusion coefficient (ADC) levels to distinguish synovium from effusion. Standard magnetic resonance imaging of the knee including post-contrast imaging was obtained in eight patients (mean age, 12 years 8 months, five females) using an open-bore magnetic resonance imaging system (1.0 T). In addition, axially acquired echo-planar DWI datasets (b-values 0, 50, and 600) were prospectively obtained and the diffusion images were post-processed into ADC50-600 maps. Two independent observers selected a region of interest (ROI) for both synovium and effusion using aligned post-contrast images as landmarks. Mann-Whitney U test was performed to compare ADC synovium and ADC effusion. DWI was successfully obtained in all patients. When data of both observers was combined, ADC synovium was lower than ADC effusion in the ROI in seven out of eight patients (median, 1.92 x 10-3 mm2/s vs. 2.40 x 10-3 mm2/s, p = 0.006, respectively). Similar results were obtained when the two observers were analyzed separately (observer 1: p = 0.006, observer 2: p = 0.04). In this pilot study, on a patient-friendly 1.0-T open-bore MRI, we demonstrated that DWI may potentially be a feasible non-invasive imaging technique in children with JIA. We could differentiate synovium from effusion in seven out of eight patients based on the ADC of synovium and effusion. However, to select synovium and effusion on DWI, post-contrast images were still a necessity. (orig.)

  6. A design for high precision boring auxiliary device with multi-station synchronous processing function%一种实现多工位同步加工的高精度镗孔辅助装置的研制

    Institute of Scientific and Technical Information of China (English)

    吴世雄

    2013-01-01

    Designs a boring auxiliary device specifically for floor-type boring machine in mechanical processing industry ,and de-scribes its working principle .In order to improve the machining accuracy of traditional floor-type boring machine and make it pro-duce better products,the high precision boring auxiliary device with multi-station simultaneous processing function referred has the features of high positioning accuracy ,the amount of feed readable ,simple operation & adjustment ,and etc.In addition,the device can be transformed according to the specific situation of machine tool to meet the special requirements of different equipments .%为提高传统型落地镗机床的加工精度,介绍一种针对落地镗床设计的镗孔辅助装置,并对其工作原理进行阐述。所设计的多工位同步加工的高精度镗孔辅助装置具有定位精度高、进刀量可读、操作及调整简单等特性。此外,该镗孔辅助装置可根据机床的具体情况进行相关改造,满足不同设备的特殊要求。

  7. Development of small-bore, high-current-density railgun as testbed for study of plasma-materials interaction. Progress report for October 16,2000 - May 13, 2003

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Kyekyoon [Kevin

    2003-05-14

    The present document is a final technical report summarizing the progress made during 10/16/2000 - 05/13/2003 toward the development of a small-bore railgun with transaugmentation as a testbed for investigating plasma-materials interaction.

  8. Dosage of boron traces in graphite, uranium and beryllium oxide; Dosage de traces de bore dans le graphite, l'uranium et l'oxyde de beryllium

    Energy Technology Data Exchange (ETDEWEB)

    Coursier, J. [Ecole Nationale Superieure de Physique et Chimie Industrielles, 75 - Paris (France); Hure, J.; Platzer, R. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1955-07-01

    The problem of the dosage of the boron in the materials serving to the construction of nuclear reactors arises of the following way: to determine to about 0,1 ppm close to the quantities of boron of the order of tenth ppm. We have chosen the colorimetric analysis with curcumin as method of dosage. To reach the indicated contents, it is necessary to do a previous separation of the boron and the materials of basis, either by extraction of tetraphenylarsonium fluoborate in the case of the boron dosage in uranium and the beryllium oxide, either by the use of a cations exchanger resin of in the case of graphite. (M.B.) [French] Le probleme du dosage du bore dans les materiaux servant a la construction de reacteurs nucleaires se pose de la facon suivante: determiner a environ 0,1 ppm pres des quantites de bore de l'ordre de quelques dixiemes de ppm. Nous avons choisit la colorimetrie a la curcumine comme methode de dosage. Pour atteindre les teneurs indiquees, il est necessaire d'effectuer une separation prealable du bore et des materiaux de base, soit par extraction du fluoborate de tetraphenylarsonium dans le cas du dosage de bore dans l'uranium et l'oxyde de beryllium, soit par l'utilisation d'une resine echangeuse de cations dans le cas du graphite. (M.B.)

  9. The Design of a Fining Boring Machine for Three Kinds of Holes on the WD12 Cylinder%WD12气缸体三轴孔精镗机床的设计

    Institute of Scientific and Technical Information of China (English)

    韩海群; 李春燕

    2011-01-01

    为保证缸体曲轴孔、凸轮轴孔和惰轮孔的加工精度,设计了WD12气缸体三轴孔精镗机床,确定了单面卧式总体方案、加工示意图和电气动作循环表.曲轴孔和凸轮轴孔均是多档间断的长孔,其精度要求高.为提高镗杆的刚度,除尽量加粗镗杆、设置中间支承外,选择德国玛帕生产的直线镗杆和浮动接头及美国GATCO生产的滚动导向套保证精度.采用"一面两销"的定位方案和液压夹紧机构.并对镗模安装提出了具体的要求.设备经十个月的研制,得到用户的认可.%To ensure the accuracy of three kinds of holes of crankshaft, camshaft and idlers, a triaxial fine boring machine for the WD12 cylinder is designed. The singleside horizontal boring is determined which include the overall program machining sketch chart and electrical action cycle table The holes of crankshaft and camshaft are long with intermittent gap and high precision To improve the rigidity of boring bars,some methods are applied. They include making the boring bar thicker, adding the intermediate support,choosing the line boring bars and floating holders of Mapa, and selecting the precision rotary bushings of GATCO. Put to use the fixing scheme of "one plane and two pins" and hydraulic clamping facility and make a specific request of installation requirements of the boring mold in the machine. After ten months of research, the boring machine get user's acceptance

  10. Experiment of 10-T, 60-cm-bore Nb3Sn test module coil (TMC-1) for the cluster test program

    International Nuclear Information System (INIS)

    A 60-cm-bore coil wound with a reacted multifilamentary Nb3Sn conductor, named as TMC-1, was constructed. A magnetic field of 10.2 T was successfully generated at a current of 6,056 A with a back-up field of 3.3 T from the cluster test coil. The total stored energy was 39 MJ. The strain of the Nb3Sn conductor was 0.67 % including a bending strain of 0.54 % during winding. Moreover, a 30-cm-length normal zone, nucleated by heater-input technique in the innermost turn, was recovered to superconducting state at 10 T. This means that a heat flux of conductor cooling surface is more than 1.08 W/cm2. For the manual dump with a decay time of 14 second(B=0.48 T/sec.), the TMC-1 was stable without any damage. The TMC-1, which is pool-cooled at 4.2 K, is constructed as a step of the development of high field toroidal coil in a tokamak fusion machine. From thease results, it is demonstrated that multifilamentary Nb3Sn conductor is applicable to large-current and large-size coil

  11. Construction and test results of a compact 0.8 meter warm bore 1.5 Tesla high homogeneity superconducting magnet for MR spectroscopy

    International Nuclear Information System (INIS)

    a superconducting magnet aimed at whole body MRI and spectroscopic studies was designed, constructed and tested. Magnet was wound with a 2 mm diameter NbTi/Cu multifilamentary composite conductor. The design field was B0 = 1.5 T, the design value for field homogeneity ΔB/B0 - 0.1 ppm over a 20 cm diameter spherical volume, and the design value for the field stability dB0/dt/B0 ≤ 0.1 ppm/h. During construction of the magnet, special emphasis was put into evaluating the winding accuracy which is attainable in practice. Dimensional measurements on the coil were compared with subsequent field measurements. The magnet was designed to be fully self-protective in the event of a quench. The quench calculations were verified by test quench measurements. The magnet was cooled by immersion in a 300 liter LHe-bath of an annular helium cryostat having an 0.8 m diameter GRP room temperature bore tube, with a 7 l/d LHE boil-off. In this paper constructional and design aspects are discussed and test results are given

  12. Development of a 40 mm bore magnet cross section with high field uniformity for the 6.6T SSC dipole

    International Nuclear Information System (INIS)

    The SSC requires a very uniform dipole field. A 40 mm bore diameter winding cross section has been developed which has computed multipole coefficients less than 1 x 10-6 of the dipole field at 10 mm radius for an operating field of 6.6T at 4.35 K. This cross section has 4 conductor blocks (3 wedges, 16 turns) per quadrant in the inner layer, and two blocks (1 wedge, 20 turns) in the outer layer. ''Partially keystoned'' cable is used; the inner cable has 23 strands of .0318 inch diameter wire; the outer cable has 30 strands of .0255 inch diameter wire. Model magnets have been constructed and the fields measured at room temperature and at liquid helium temperature up to fields exceeding 6.6T. Measured fields are compared to the predicted field. In addition, the as-built conductor positions in several magnets have been determined after cutting up the magnets. The predictions based on as-built configurations are computed and compared to measurements

  13. Fast determination of arsenosugars in algal extracts by narrow bore high-performance liquid chromatography-inductively coupled plasma mass spectrometry.

    Science.gov (United States)

    Todolí, José Luis; Grotti, Marco

    2010-11-19

    The potential of narrow bore high-performance liquid chromatography (HPLC) with detection by inductively coupled plasma mass spectrometry (ICP-MS) for fast determination of arsenosugars in algal extracts was explored. The retention behavior of four naturally occurring dimethylarsinoylribosides on an anion-exchange microbore column was investigated, with the mobile phase flow rate ranging from 60 to 200μLmin(-1). A low sample consumption system consisting of a micronebulizer and a low inner volume cyclonic spray chamber was used as the interface between the micro-column and the ICP mass spectrometer. Both the high efficiency nebulizer, HEN, and the PFA micronebulizer were tested, with the former providing 20-50% greater sensitivity than PFA (depending on the liquid flow rate), but comparable limits of detection and slightly lower chromatographic resolution. With the setup employed and under the optimal conditions, a satisfactory separation of the arsenosugars was achieved in less than 5min. The instrumental limit of detection was 0.20μgAsL(-1) and the precision was better than 3% (RSD%, n=5). The accuracy of the determination was verified by the analysis of a reference algal extract, obtaining values in good agreement with the reference ones. PMID:20965508

  14. Scale-up protein separation on stainless steel wide bore toroidal columns in the type-J counter-current chromatography.

    Science.gov (United States)

    Guan, Yue Hugh; Hewitson, Peter; van den Heuvel, Remco N A M; Zhao, Yan; Siebers, Rick P G; Zhuang, Ying-Ping; Sutherland, Ian

    2015-12-11

    Manufacturing high-value added biotech biopharmaceutical products (e.g. therapeutic proteins) requires quick-to-develop, GMP-compliant, easy-to-scale and cost effective preparatory chromatography technologies. In this work, we describe the construction and testing of a set of 5-mm inner diameter stainless steel toroidal columns for use on commercially available preparatory scale synchronous J-type counter-current chromatography (CCC) machinery. We used a 20.2m long column with an aqueous two-phase system containing 14% (w/w) PEG1000 and 14% (w/w) potassium phosphate at pH 7, and tested a sample loading of 5% column volume and a mobile phase flow rate of 20ml/min. We then satisfactorily demonstrated the potential for a weekly protein separation and preparation throughput of ca. 11g based on a normal weekly routine for separating a pair of model proteins by making five stacked injections on a single portion of stationary phase with no stripping. Compared to our previous 1.6mm bore PTFE toroidal column, the present columns enlarged the nominal column processing throughput by nearly 10. For an ideal model protein injection modality, we observed a scaling up factor of at least 21. The 2 scales of protein separation and purification steps were realized on the same commercial CCC device. PMID:25818556

  15. Ecological studies of wood-boring bivalves in the vicinity of the Oyster Creek Nuclear Generating Station. Progress report, September-November 1981

    Energy Technology Data Exchange (ETDEWEB)

    Hoagland, K.E.; Crocket, L.

    1982-06-01

    The species composition, distribution, and population dynamics of wood-boring bivalves are being studied in the vicinity of the Oyster Creek Nuclear Generating Station, Barnegat Bay, New Jersey. Untreated wood test panels are used to collect organisms at 12 stations. Physiological tolerances of 3 species are also under investigation in the laboratory. Competition among the species is being analyzed. In the fall of 1981, Teredo bartschi remained in Oyster Creek despite continuous prolonged outages of the Oyster Creek Nuclear Generating Station. It did not spread to Forked River or Waretown as it had done in other years when the effluent was present. The peak in larval production and settlement of T. bartschi occurred between September and October. Settlement of shipworms occurred on no monthly panels except those in Oyster Creek during the period of this report. Laboratory experiments revealed that T. bartschi becomes inactive at 5/sup 0/C (24/sup 0///sub 00/) and T. navalis shows signs of osmotic stress below 10/sup 0///sub 00/ at 18/sup 0/C. The shipworms in Barnegat Bay do not show a preference for settling at the mudline when the substrate is not limited.

  16. Ecological studies of wood-boring bivalves in the vicinity of the Oyster Creek Nuclear Generating Station. Progress report, June-August 1982

    Energy Technology Data Exchange (ETDEWEB)

    Hoagland, K.E.

    1982-12-01

    The species composition, distribution, and population dynamics of wood-boring bivalves are being studied in the vicinity of the Oyster Creek Nuclear Generating Station, Barnegat Bay, New Jersey. Untreated wood test panels are used to collect organisms at 12 stations. Physiological tolerances of 3 species are also under investigation in the laboratory. Competition among the species is being analyzed. Adult populations of Teredo bartschi existed in both Oyster Creek and Forked River in the summer of 1982, but the species was rare. There was no large settlement of this or any other teredinid species in Barnegat Bay. Teredo navalis was the most common species in the monthly panels. The fouling community reached its maximum yearly diversity in June-July. There was a thermal effluent causing a ..delta..T of 3 to 4/sup 0/C during most of the summer, and salinity in Oyster Creek and Forked River was similar to that of Barnegat Bay. The lack of a shipworm outbreak in 1982 may be related to the low ..delta..T in summer, plus the lack of a thermal effluent in the preceding winter-spring period.

  17. Development of Virtual Reality System of Shield Machine and Boring%盾构及掘进流程虚拟现实系统开发

    Institute of Scientific and Technical Information of China (English)

    韩伟锋; 李凤远; 陈启伟

    2012-01-01

    为进行盾构施工研究和降低盾构掘进现场培训给盾构施工相关人员带来的风险,采用数字样机结合虚拟现实技术以拓展传统的虚拟样机的概念,功能上具备虚拟装配、运动仿真、工作过程及各种标矢量场可视化的仿真能力,实现了盾构设备及施工场景的虚拟样机实例研究和实验室盾构操作、维护等培训。%The concept of the traditional virtual prototype of shield machine is enlarged by connecting the digital proto type with the virtual reality, so as to develop the virtual reality system of shield machine and boring. The virtual reality system developed has such functions as virtual assembly, movement simulation and visualized simulation of working pro cedure and scalars and vectors. The virtual reality system developed is helpful to the study and training in the shield tun neling technology.

  18. Effect of Chipping and Solarization on Emergence and Boring Activity of a Recently Introduced Ambrosia Beetle (Euwallacea sp., Coleoptera: Curculionidae: Scolytinae) in Southern California.

    Science.gov (United States)

    Eatough Jones, Michele; Paine, Timothy D

    2015-08-01

    Polyphagous shot hole borer (Euwallacea sp., Coleoptera: Curculionidae: Scolytinae) has recently invaded southern California. The beetle, along with its associated fungi, Fusarium euwallaceae, Graphium sp., and Acremonium sp., causes branch dieback and tree mortality in a large variety of tree species including avocado (Persea americana Mill.) and box elder (Acer negundo L.). With the spread of the beetle through Los Angeles, Orange, and San Diego Counties in California, there is increasing concern that felled trees and pruned branches infested with polyphagous shot hole borer should receive sanitation treatment to reduce the potential spread of the beetle from the movement of untreated wood. We tested two sanitation methods to reduce beetle populations, chipping with a commercial chipper and solarization by covering logs with clear or black plastic in full sun. Both chipping and solarization decreased beetle emergence and boring activity compared to untreated control logs. Chipping was most effective for chip sizes <5 cm. Solarization was most effective using clear polyethylene sheeting during hot summer months, particularly August, when daily maximum temperatures were ≥35°C. Beetles persisted for 2 mo or more when solarization was applied during the spring or fall. PMID:26470327

  19. A device for taking samples of scale from bore pipes used for collecting groundwater; Dispositivo para la toma de muestras de incrustaciones en tuberias de sondeos en la captacion de aguas subterraneas

    Energy Technology Data Exchange (ETDEWEB)

    Martinez Rubio, J.; Ruano Magan, P. [Tecnologias y Servicios Agrarios, S. A. (Spain); Gonzalez Yelamos, J. [Universidad Autonoma de Madrid (Spain); Rebollo Ferreiro, L. F. [Universidad de Alcala (Spain)

    2000-07-01

    A study was made of the problem of corrosion/scale in water collection bore pipes, beginning with a review of the existing literature. This led to the conclusion that thorough knowledge of such phenomena requires taking samples from the walls of the pipes and filters to determine the physiocochemical and biological details. A new instrument, based on a previous appliance, has been developed for this purpose. It has a pair of arms and is capable of going down inside the well or bore hole, generally with a video camera attached. It has a cup on the end of each arm that can scrape the wall, catch the sample and protect it with a lid. A prototype has proved to be efficient at obtaining representative samples that can be analysed to determine the corrosion/scale processes. (Author) 9 refs.

  20. Bedrock topography of western Cape Cod, Massachusetts, based on bedrock altitudes from geologic borings and analysis of ambient seismic noise by the horizontal-to-vertical spectral-ratio method

    Science.gov (United States)

    Fairchild, Gillian M.; Lane, Jr., John W.; Voytek, Emily B.; LeBlanc, Denis R.

    2013-01-01

    This report presents a topographic map of the bedrock surface beneath western Cape Cod, Massachusetts, that was prepared for use in groundwater-flow models of the Sagamore lens of the Cape Cod aquifer. The bedrock surface of western Cape Cod had been characterized previously through seismic refraction surveys and borings drilled to bedrock. The borings were mostly on and near the Massachusetts Military Reservation (MMR). The bedrock surface was first mapped by Oldale (1969), and mapping was updated in 2006 by the Air Force Center for Environmental Excellence (AFCEE, 2006). This report updates the bedrock-surface map with new data points collected by using a passive seismic technique based on the horizontal-to-vertical spectral ratio (HVSR) of ambient seismic noise (Lane and others, 2008) and from borings drilled to bedrock since the 2006 map was prepared. The HVSR method is based on a relationship between the resonance frequency of ambient seismic noise as measured at land surface and the thickness of the unconsolidated sediments that overlie consolidated bedrock. The HVSR method was shown by Lane and others (2008) to be an effective method for determining sediment thickness on Cape Cod owing to the distinct difference in the acoustic impedance between the sediments and the underlying bedrock. The HVSR data for 164 sites were combined with data from 559 borings to bedrock in the study area to create a spatially distributed dataset that was manually contoured to prepare a topographic map of the bedrock surface. The interpreted bedrock surface generally slopes downward to the southeast as was shown on the earlier maps by Oldale (1969) and AFCEE (2006). The surface also has complex small-scale topography characteristic of a glacially eroded surface. More information about the methods used to prepare the map is given in the pamphlet that accompanies this plate.

  1. Theoretical exploration and experimental investigation of abrasive flow machining of connecting rod large end bore%连杆大头孔磨料流加工的理论探讨及实验研究

    Institute of Scientific and Technical Information of China (English)

    邵立新; 赵培峰; 董志国; 张裕生; 轧刚

    2012-01-01

    针对H12V190Z柴油机连杆大头孔表面的磨料流加工方法进行了研究,利用CFD软件对其加工流场进行了模拟仿真,得到了流体磨料在流场中的压力和速度分布.结合工艺实验验证了经磨料流加工后连杆大头孔加工表面的粗糙度值有明显的减小,提高了连杆表面的质量,大大缩短了加工时间,提高了加工效率.%Abrasive flow machining method of connecting rod large end bore surface of H12V190Z diesel engine was studied by machining flow field simulation based on CFD software. The distributions of pressure and velocity in abrasive media flow field were obtained. Abrasive flow machining experiment results proved that, the surface roughness value of connecting rod large end bore was evidently reduced, the surface quality of connecting rod large end bore surface was improved, the machining time was shortened and efficiency was increased.

  2. Feasibility study of simultaneous physical examination and dynamic MR imaging of medial collateral ligament knee injuries in a 1.5-T large-bore magnet

    International Nuclear Information System (INIS)

    To determine the feasibility of evaluating medial knee joint laxity with dynamic magnetic resonance (MR) imaging and simultaneous physical joint examination in a large-bore 1.5-T system. The study included 10 patients (5 women, 5 men; mean age 35 years) with clinically diagnosed and categorized acute injuries of the medial collateral ligament (MCL). Intermittent valgus stress was applied separately to both the affected and the contralateral knee joint during dynamic MR imaging with a two-dimensional fast low-angle shot sequence. The width of the medial joint space and the opening angle between the femoral condyles and the tibial plateau were measured. Results obtained from dynamic MR imaging of the affected knee were compared with morphological MCL changes on static MRI, to kinematics of the contralateral side and to the clinical grading of MCL injuries. On clinical examination, all patients had grade 2 MCL injuries except one, who had a grade 1 lesion. Using morphological MRI criteria, 9 grade II and 1 grade III injuries were seen. Mean medial joint space width and opening angles of all affected knees were 2.8 mm and 2.7 respectively, compared with 1.7 mm and 2.1 on the contralateral side. The Wilcoxon signed rank test indicated that the differences in width (P = 0.005) and opening angle (P = 0.037) between the affected and contralateral knees were significant. Dynamic MR imaging and simultaneous physical joint examination is feasible. Our results suggest that this technique might enable the imaging documentation of medial ligamentous knee instability. (orig.)

  3. Feasibility study of simultaneous physical examination and dynamic MR imaging of medial collateral ligament knee injuries in a 1.5-T large-bore magnet

    Energy Technology Data Exchange (ETDEWEB)

    Studler, Ueli [Mount Sinai Hospital and University Health Network, University of Toronto, Department of Medical Imaging, Toronto, ON (Canada); University Hospital Basel, Department of Radiology, Basel (Switzerland); White, Lawrence M.; Deslandes, Melanie; Sussman, Marshall S. [Mount Sinai Hospital and University Health Network, University of Toronto, Department of Medical Imaging, Toronto, ON (Canada); Geddes, Christopher; Theodoropoulos, John [Mount Sinai Hospital and University Health Network, University of Toronto, Division of Orthopedic Surgery, Toronto, ON (Canada)

    2011-03-15

    To determine the feasibility of evaluating medial knee joint laxity with dynamic magnetic resonance (MR) imaging and simultaneous physical joint examination in a large-bore 1.5-T system. The study included 10 patients (5 women, 5 men; mean age 35 years) with clinically diagnosed and categorized acute injuries of the medial collateral ligament (MCL). Intermittent valgus stress was applied separately to both the affected and the contralateral knee joint during dynamic MR imaging with a two-dimensional fast low-angle shot sequence. The width of the medial joint space and the opening angle between the femoral condyles and the tibial plateau were measured. Results obtained from dynamic MR imaging of the affected knee were compared with morphological MCL changes on static MRI, to kinematics of the contralateral side and to the clinical grading of MCL injuries. On clinical examination, all patients had grade 2 MCL injuries except one, who had a grade 1 lesion. Using morphological MRI criteria, 9 grade II and 1 grade III injuries were seen. Mean medial joint space width and opening angles of all affected knees were 2.8 mm and 2.7 respectively, compared with 1.7 mm and 2.1 on the contralateral side. The Wilcoxon signed rank test indicated that the differences in width (P = 0.005) and opening angle (P = 0.037) between the affected and contralateral knees were significant. Dynamic MR imaging and simultaneous physical joint examination is feasible. Our results suggest that this technique might enable the imaging documentation of medial ligamentous knee instability. (orig.)

  4. 地下水位变化对盾构隧道的影响研究%Study on Influence of Water Level Fluctuation on Shield-bored Tunnel

    Institute of Scientific and Technical Information of China (English)

    李春良; 王勇; 张巍

    2012-01-01

    A finite element model of shield-bored tunnel structure is established, so as to study the influence of water level fluctuation on shield-bored tunnel. The deformation of the tunnel and the ground under different water levels can be predicted and the displacement rules of the shield-bored tunnel under different water levels can be revealed by means of the model. The study results show that : 1 ) Rebound deformation will occur to the shallow soil layers at the ground sur- face when the water level rises. The rebound value of ground under which shield-bored tunnel exists is smaller than that of ground under which no shield-bored tunnel exists. 2) Vertical displacement of the tunnel structure and lateral dis- placement of the sidewall will happen when the ground water level rises from the invert to the crown. The higher the ground water level, the bigger the displacement value.%为研究地下水位变化对盾构隧道结构的影响,利用有限元理论,建立了地下水位变化时盾构隧道结构的有限元模型,该模型可预测出不同地下水位时盾构隧道及地面变形情况,揭示出不同水位时的盾构隧道在土中的位移变化规律。结果表明:地下水位发生变化会对盾构隧道产生一定的影响。地下水位上升会导致地表浅层土体发生回弹变形,并且下方有盾构隧道的地表的回弹值要比下方没有盾构隧道的地表的回弹值小;当地下水位从盾构隧道拱底处逐渐升高到中心处和拱顶处时,盾构隧道结构会出现竖向位移和边壁的侧向位移,并且水位越高,隧道的竖向位移和边壁的侧向位移越大。

  5. Manufacturing of high precision bores

    OpenAIRE

    Bana, I.V.

    2006-01-01

    Traditional finishing, like grinding, particularly in the machining of hardened parts, requires the consumption of a significant amount of coolant. This is harmful for the environment. Besides this, more initiatives were taken in process planning to improve the process economy and flexibility. Reduction of machining cost and time is one of the most important factors in development of new technologies. In the 70s, preliminary research studies were done to develop hard turning process as new te...

  6. Predictive power of the ESUR scoring system for prostate cancer diagnosis verified with targeted MR-guided in-bore biopsy

    International Nuclear Information System (INIS)

    Highlights: • The PI-RADS summed score (PSsum) demonstrated very good diagnostic values, especially for higher grade PCa. • Lesions with PSsum ≥13 represented prostate cancer in 88% and higher grade prostate cancer in 42%. • Sensitivity and NPV was nearly 100% for higher grade PCa detection using a cut-off limit of PSsum 10. • Peripheral zone lesions demonstrated better diagnostic value with the PSsum compared to transitional zone lesions. • Further improvement of the PI-RADS score is required to prevent unnecessary overdiagnosis. - Abstract: Purpose: This study evaluates the diagnostic value of the ESUR scoring system (PI-RADS) regarding prostate cancer detection using MR-guided in-bore biopsies (IB-GB) as the reference standard. Methods: 566 lesions in 235 consecutive patients (65.7 ± 7.9 years, PSA 9.9 ± 8.5 ng/ml) with a multiparametric (mp)-MRI (T2WI, DWI, DCE) of the prostate at 3 T were scored using the PI-RADS scoring system. PI-RADS single (PSsingle), summed (PSsum), and overall (PSoverall) scores were determined. All lesions were histologically verified by IB-GB. Results: Lesions with a PSsum below 9 contained no prostate cancer (PCa) with Gleason score (GS) ≥ 4 + 3 = 7. A PSsum of 13–15 (PSoverall V) resulted in 87.8% (n = 108) in PCa and in 42.3% (n = 52) in GS ≥ 4 + 3 = 7. Transition zone (TZ) lesions with a PSsum of 13–15 (PSoverall V) resulted in 76.3% (n = 36) in PCa and in 26.3% (n = 10) in GS ≥ 4 + 3 = 7, whereas for peripheral zone (PZ) lesions cancer detection rate at this score was 92.9% (n = 79) and 49.4% (n = 42) for GS ≥ 4 + 3 = 7. Using a threshold of PSsum ≥ 10, sensitivity was 86.0%, and negative predictive value (NPV) was 86.2%. For higher grade PCa sensitivity was 98.6%, and NPV was 99.5%. Conclusion: A PSsum below 9 excluded a higher grade PCa, whereas lesions with a PSsum ≥ 13 (PSoverall V) represented in 88% PCa, and in 42% higher grade PCa. The PSsum or PSoverall demonstrated a better diagnostic value

  7. Mécanisme de l'usure par polissage des cylindres de moteurs diesel Bore Polishing Wear Mechanism in Diesel Engine Cylinders

    Directory of Open Access Journals (Sweden)

    Fayard J. C.

    2006-11-01

    particulier, l'usure des segments ainsi que les débits de gaz de soufflage, sont plus faibles qu'avec une chemise normale. Enfin, le mécanisme de l'usure par polissage par abrasion douce à deux et à trois corps est parfaitement confirmé par une exploration micrographique et une microanalyse des surfaces polies. A fast and economical method for evaluating lubricants and fuels in relation to the bore polishing wear of super charged diesel-engine cylinders has been developed using a single-cylinder laboratory engine within the framework of an Société Nationale Elf Aquitaine - Institut Français du Pétrole (SNEA-lFP research agreement. This method bears the reference IFP-UP-4/80.It also serves to evaluate the deposit-forming and sticking tendency, ring wear and the oil-consumption tendency of lubricants. It is in good correlation with the CEC-Ford Tornado test and makes an excellent discrimination between the Coordinating European Council (CEC reference cils RL 47 and RL 48. The method is used for investigating the bore polishingwear mechanism by searching for the influence exerted by the principal parameters: (a Composition of the lubricant: the phenomenon is influenced by the base oil and its viscosity, by the amount of polymers improving the viscosity index and especially by the choice of detergent additives. As a first approximation and for homogeneous oil familles, polishing wear increases when the thermal stability of the oil decreases. (b Engine running: polishing increases very fart with the engine load after a certain threshold, and its evolution in time as observed by endoscopic rating shows a characteristic S shape as polishing begins on the thrust side and at the top of the cylinder. (c Composition of the fuel: the increase in the sulfur content of diesel fuel considerably decreases polishing wear caused by an oil reputed to be poorfrom this standpoint but has no effect on a goodoil. (d Surface finish of the cylinder: prepolishing the liner by extremely fine

  8. Tunnel boring machine collision with an ancient boulder beach during the excavation of the Barcelona city subway L10 line: a case of adverse geology and resulting engineering solutions

    OpenAIRE

    Filbà, Marta; Salvany Duran, Josep Maria; Jubany, Jordi; Carrasco, Laura

    2016-01-01

    The existence of a layer of hard boulders up to 1 m in size within the soft sediments of the Holocene Llobregat delta in the SW of Barcelona city caused the damage and stoppage of the EPB-type tunnel boring machine that excavated the subway L10 line. This layer constitutes a detrital deposit of exceptionally large grain size developed in the base of the delta. It originated as an alluvial fan in the northern margin of the delta during the last fall of the Mediterranean Sea level, at the end o...

  9. Bored pile in deep water of Xiluodu Jinshajiang Bridge and the cap construction%溪洛渡金沙江大桥深水钻孔桩及承台施工

    Institute of Scientific and Technical Information of China (English)

    和小军

    2012-01-01

    通过对溪洛渡金沙江大桥的深水钻孔桩及承台施工,对工程的施工组织及施工工艺进行了总结和研究,达到了很好的施工效果,也便于施工类似工程时予以借鉴。%The paper summarizes and studies the engineering construction organization and construction technology by bored pile in deep water and cap construction of Xiluodu Jinshajiang Bridge, and achieves good construction effect, which will be some guidance for similar engineering construction.

  10. Predictive power of the ESUR scoring system for prostate cancer diagnosis verified with targeted MR-guided in-bore biopsy

    Energy Technology Data Exchange (ETDEWEB)

    Schimmöller, L., E-mail: Lars.Schimmoeller@med.uni-duesseldorf.de [Univ Dusseldorf, Medical Faculty, Department of Diagnostic and Interventional Radiology, Moorenstr. 5, D-40225 Dusseldorf (Germany); Quentin, M., E-mail: Michael.Quentin@med.uni-duesseldorf.de [Univ Dusseldorf, Medical Faculty, Department of Diagnostic and Interventional Radiology, Moorenstr. 5, D-40225 Dusseldorf (Germany); Arsov, C., E-mail: Cristian.Arsov@med.uni-duesseldorf.de [Univ Dusseldorf, Medical Faculty, Department of Urology, Moorenstr. 5, D-40225 Dusseldorf (Germany); Hiester, A., E-mail: Andreas.Hiester@med.uni-duesseldorf.de [Univ Dusseldorf, Medical Faculty, Department of Urology, Moorenstr. 5, D-40225 Dusseldorf (Germany); Kröpil, P., E-mail: Patric.Kroepil@med.uni-duesseldorf.de [Univ Dusseldorf, Medical Faculty, Department of Diagnostic and Interventional Radiology, Moorenstr. 5, D-40225 Dusseldorf (Germany); Rabenalt, R., E-mail: Robert.Rabenalt@med.uni-duesseldorf.de [Univ Dusseldorf, Medical Faculty, Department of Urology, Moorenstr. 5, D-40225 Dusseldorf (Germany); Albers, P., E-mail: urologie@uni-duesseldorf.de [Univ Dusseldorf, Medical Faculty, Department of Urology, Moorenstr. 5, D-40225 Dusseldorf (Germany); Antoch, G., E-mail: Antoch@med.uni-duesseldorf.de [Univ Dusseldorf, Medical Faculty, Department of Diagnostic and Interventional Radiology, Moorenstr. 5, D-40225 Dusseldorf (Germany); Blondin, D., E-mail: Dirk.Blondin@sk-mg.de [Univ Dusseldorf, Medical Faculty, Department of Diagnostic and Interventional Radiology, Moorenstr. 5, D-40225 Dusseldorf (Germany)

    2014-12-15

    Highlights: • The PI-RADS summed score (PS{sub sum}) demonstrated very good diagnostic values, especially for higher grade PCa. • Lesions with PS{sub sum} ≥13 represented prostate cancer in 88% and higher grade prostate cancer in 42%. • Sensitivity and NPV was nearly 100% for higher grade PCa detection using a cut-off limit of PS{sub sum} 10. • Peripheral zone lesions demonstrated better diagnostic value with the PS{sub sum} compared to transitional zone lesions. • Further improvement of the PI-RADS score is required to prevent unnecessary overdiagnosis. - Abstract: Purpose: This study evaluates the diagnostic value of the ESUR scoring system (PI-RADS) regarding prostate cancer detection using MR-guided in-bore biopsies (IB-GB) as the reference standard. Methods: 566 lesions in 235 consecutive patients (65.7 ± 7.9 years, PSA 9.9 ± 8.5 ng/ml) with a multiparametric (mp)-MRI (T2WI, DWI, DCE) of the prostate at 3 T were scored using the PI-RADS scoring system. PI-RADS single (PS{sub single}), summed (PS{sub sum}), and overall (PS{sub overall}) scores were determined. All lesions were histologically verified by IB-GB. Results: Lesions with a PS{sub sum} below 9 contained no prostate cancer (PCa) with Gleason score (GS) ≥ 4 + 3 = 7. A PS{sub sum} of 13–15 (PS{sub overall} V) resulted in 87.8% (n = 108) in PCa and in 42.3% (n = 52) in GS ≥ 4 + 3 = 7. Transition zone (TZ) lesions with a PS{sub sum} of 13–15 (PS{sub overall} V) resulted in 76.3% (n = 36) in PCa and in 26.3% (n = 10) in GS ≥ 4 + 3 = 7, whereas for peripheral zone (PZ) lesions cancer detection rate at this score was 92.9% (n = 79) and 49.4% (n = 42) for GS ≥ 4 + 3 = 7. Using a threshold of PS{sub sum} ≥ 10, sensitivity was 86.0%, and negative predictive value (NPV) was 86.2%. For higher grade PCa sensitivity was 98.6%, and NPV was 99.5%. Conclusion: A PS{sub sum} below 9 excluded a higher grade PCa, whereas lesions with a PS{sub sum} ≥ 13 (PS{sub overall} V) represented in 88

  11. Analysis on Engineering Accident Related to Rotary Bored Cast-in-situ Piles Built in Soft Soil Area%软土地区旋挖成孔灌注桩工程事故分析

    Institute of Scientific and Technical Information of China (English)

    谢雄亮

    2014-01-01

    本文针对软土地区某超高层建筑物旋挖成孔灌注桩的工程事故,采用钻芯法、声波透射法和单桩竖向抗压试验进行了详细的检测,分析了工程事故发生的原因,给出了相应的预防措施及对策,对软土地区旋挖成孔灌注桩的应用提供了有益的结果。%Aimed at the engineering accidents related to the rotary bored cast -in-situ pile and occurred in a certain super high -rise building in the soft soil area , this article carried out the detailed detection by using the core drilling method , acoustic transmission method and single pile vertical compression test , analyzed the causes of the engineering accident happened , and provided the corresponding pre-ventive methods and countermeasures and the useful results for the rotary bored cast -in-situ pile applications in the soft soil area .

  12. Total-body contrast-enhanced MRA on a short, wide-bore 1.5-T system: intra-individual comparison of Gd-BOPTA and Gd-DOTA

    International Nuclear Information System (INIS)

    Total-body contrast-enhanced MRA (CE-MRA) provides information of the entire vascular system according to a one-stop-shop approach. Short, wide-bore scanners have not yet been used for total-body CE-MRA, probably due to their restricted field of view in the z-direction. The purpose of this feasibility study is to introduce an image protocol for total-body MRA on a short, wide-bore system. The protocol includes five to six table-moving steps and two injection runs. Two pharmacologically different contrast materials (CM) were applied in ten healthy volunteers in view of possible CM-dependent influences on the protocol outcome (Gd-Bopta, Gd-Dota). Differences consisted of significantly higher CNR with Gd-Bopta with a mean of 73.8±38.7 versus 69.1±34.3 (p=0.008), significantly better arterial visualization values with Gd-Dota with a mean of 1.26±0.44 versus 1.53 ±0.73 (p=0.003) and a tendency to less venous overlay with Gd-Dota, mean 1.19 ± 0.44 and 1.34 ± 0.72, respectively (p=0.065) (two-tailed Wilcoxon matched-pairs test). Overall 94% of the steps were valued as qualitatively excellent or good. The good results with both CM suggest a transfer to further patient evaluation. (orig.)

  13. STATISTICS AND ANALYSIS ON BORE-HOLES OF LARGE-SCALED SOIL AND ROCK BLASTING PROJECT%大型土石方爆破工程的钻孔统计分析

    Institute of Scientific and Technical Information of China (English)

    刘翼; 卢磊; 董金成

    2011-01-01

    In order to find the deviation of unit explosion consumption and blasting stone quantity of pre-meter between actual value and estimated value. Bore-holes statistics of a large-scaled cubic meter of earth and stone project in north china were carried out according to construction progress. The relation of hole-depth and blasting stone quantity of pre-meter was analyzed. It was found that high proportion of bore-holes less than 5m deep was main factor that induced comprehensive blasting stone quantity of pre-meter. So it can draw a conclusion that comprehensive blasting stone quantity of pre-meter can be increased effectively through optimization and combination and decreasing quantity of shallow bore-holes in the condition of given hole grid parameter and bench height to flat gradient bench blasting project. The conclusion points out direction for reducing cost of flat gradient bench blasting project.%为了找出炸药单耗和延米爆破方量的实际值与预算值之间的差别原因,对我国北方一大型土石方爆破工程的钻孔按施工进度进行了统计.并对孔深与延米爆破方量的关系进行了分析.研究发现小于5m深的炮孔数量的比例较大,是降低综合延米爆破方量的一大主要因素.因此得出,缓斜坡的台阶爆破工程中,在孔网参数和台阶高度一定的条件下,通过优化组合,减少浅孔的数量,可以有效地提高项目综合延米爆破方量,从而为缓斜坡台阶爆破降低项目成本指明了方向.

  14. Nouvelles générations de structures en diamant dopé au bore par technique de delta-dopage pour l'électronique de puissance : croissance par CVD et caractérisation

    OpenAIRE

    Fiori, Alexandre

    2012-01-01

    Dans ce projet de thèse, qui s'appuie sur l'optimisation d'un réacteur de croissance du diamant et la construction d'un prototype, nous avons démontré l'épitaxie par étapes de couches de diamant, orientées (100), lourdement dopées au bore sur des couches de dopage plus faible dans le même processus, sans arrêter le plasma. Plus original, nous avons démontré la situation inverse. Nous présentons aussi des croissances assez lentes pour l'épitaxie de films d'épaisseur nanométriques avec de grand...

  15. Research on boring-milling machining center NC system based on PMAC%基于PMAC的镗铣加工中心数控系统的研究

    Institute of Scientific and Technical Information of China (English)

    孙建业; 李强

    2013-01-01

    This paper briefly introduces the application of PMAC in horizontal boring-milling machining center, and builds an open numerical control system, including how to realize motor's synchronous control and the switching function of biaxial group. Under the environment of VC + + 6. 0 to establish the man-machine interface, and achieves its control and communication function.%简要介绍了PMAC在卧式镗铣加工中心上的应用,建立开放式的数控系统,包括实现电动机的同步控制,双轴组的切换功能.在VC++6.0环境下建立人机交互界面,并实现其控制与通信功能.

  16. 后注浆灌注桩在某工程中的应用及经济分析%Application and Economic Analysis of Post-grouting Bored Concrete Pile in a Project

    Institute of Scientific and Technical Information of China (English)

    刘军; 洪峰

    2011-01-01

    Combined with the actual construction the principle and application of post-pressure grouting technology in pile tip and pile lateral of reinforced concrete bored cast-in pilate piles are introduced.There are many factors affecting pile foundation selection for construction works.Through the cost analysis and evaluation on the pile foundation of the construction works, some economic indicators for the selection of pile foundation under the present productive force and price level are gained.Which will be beneficial to improve the cost effectiveness and rationality of selection of it.The base-grouting treatment technique of bored concrete pile can improve the bearing capacity, so the application of this kind of pile become broad useage day by day.%结合工程实例,介绍了钢筋混凝土钻孔灌注桩桩端桩侧后压浆技术的原理及应用。影响建筑工程桩基选型的因素很多,通过典型工程桩基的造价分析与评价,得出当前生产力和物价水平条件下桩基选型的若干经济指标.有助于提高建筑工程桩基选型的经济性及合理性水平。由于灌注桩后注浆处理技术可使承载力显著提高.因而这种桩基日益得到广泛应用。

  17. Numerical analysis of tension-free bored pile of wind turbine%风力发电机无张力灌注桩基础数值分析

    Institute of Scientific and Technical Information of China (English)

    何杰; 潘霄; 陶铁铃

    2015-01-01

    The tension-free bored pile is a new type of wind turbine foundation, which is suitable for collapsible loess. The structural form of the foundation is optimized and the cost is saved compared with the conventional foundation. By combination of the design of wind turbine in Hongsibao wind farm, a FEM analysis model of the tension-free bored pile of wind turbine is estab-lished. The stress, displacement, stress and settlement of foundation are calculated under extreme condition, which provides ref-erence for the perfection of the structural design of wind turbine foundation.%无张力灌注桩基础是一种新型的风机基础型式,特别适用于湿陷性黄土的地质条件,相对于传统基础,优化了结构型式、降低了造价。结合红寺堡风电场风机基础设计,通过有限元分析的方法,建立无张力灌注桩风机基础的有限元分析模型,对极端工况下基础的应力、位移、地基应力与沉降等进行了计算分析,为完善风机基础结构设计提供了依据,可供同类地质条件下风机基础结构的优化设计参考借鉴。

  18. 基于模糊PID方法的盾构掘进姿态控制研究%Research on Shield Boring Attitude Control Based on Fuzzy PID Algorithm

    Institute of Scientific and Technical Information of China (English)

    龚国芳; 洪开荣; 周天宇; 侯典清; 王林涛

    2014-01-01

    针对盾构掘进过程中姿态主要依赖操作人员施工经验手工调整、掘进轨迹精度主要依赖人员熟练性的情况,提出基于双闭环反馈自动控制盾构掘进轨迹的方法,通过主反馈实现掘进斜度的实时更新,局部反馈实现液压缸的速度控制。分析表明,局部反馈精度决定了预调偏差大小,在掘进轨迹控制中至为关键,因此以球铰支撑推进系统为例分析单环掘进前后液压缸的几何关系,推导左右推进液压缸速度关于掘进斜度、掘进速度的数学解析式,采用AMESim和MATLAB联合仿真工具搭建了推进速度控制的模糊PID模型,仿真分析非均载荷下推进液压缸的速度控制,并以盾构模拟推进试验台为例进行推进速度控制试验。结果表明:基于模糊PID控制策略的推进液压缸速度控制可实现较准确的盾构掘进轨迹,为盾构失准问题的进一步解决提供了理论基础和现实依据。%Considering the fact that the attitude of shield during the boring process is mainly controlled by manual adjustment according to personal experience and that the precision of shield boring trajectory mainly depends on personal proficiency,the authors propose the automatic shield attitude control method based on dual closed-loop feedback.The automatic shield attitude control method proposed contains a main-loop feedback that updates the tunneling trajectory and a local feedback that controls the velocity of the thrust cylinders.Succedent analysis shows that the local-feedback control is crucial.Therefore,the authors analyze the geometric relation of hydraulic cylinders before and after one-ring boring based on a spherical-hinge support thrust system,and deduce the mathematical expression of shield attitude and velocity of thrust cylinders on the left and right sides.The authors achieve the simulation of the velocity control system based on fuzzy PID by using AMEsim and MATLAB software

  19. Abnormal Phenomenon Analysis of Fins’Work in Bore for the Guided Proj ectile by Gun%制导炮弹尾翼膛内工作异常现象分析

    Institute of Scientific and Technical Information of China (English)

    蔡灿伟; 张玉荣; 陶辰立; 周杰; 孙也尊

    2014-01-01

    To study mechanism of abnormal opening of the guided proj ectile ’s fins,the performance process of fins in bore was analyzed with the phenomenon that the guided proj ectile's fins were attrited and the air holes were ablated during many experiments.The ablation model of cylinder air hole was estab-lished in the effect of the high temperature and high pressure gunpowder gas and the law of diameter of air hole and pressure within the piston cylinder were obtained combining the ablation model with the one-di-mensional two-phase flow model.The calculation results show that the diameter of air hole is expanded continually in the ablative effect of gunpowder gas and the pressure of the piston cylinder is enlarged obvi-ously.The fins are opened during the gun bore in the cylinder piston role and collided with artillery rifling violently so that the fins can not work properly out of the muzzle.The results provide an important refer-ence value for designing and improving the cylinder-open fin of the guided proj ectile.%在某型制导炮弹试验过程中发生了多次尾翼片磨损、气缸气孔烧蚀现象,为分析尾翼张开异常的原因,研究了气缸张开式尾翼膛内工作过程,建立了高温高压火药气体作用下的气孔烧蚀模型,并与内弹道一维两相流模型进行了联立求解,得到了气孔直径、活塞气缸内压力的变化规律。仿真计算结果表明,受火药气体烧蚀作用的影响,气孔直径不断扩大,气缸压力明显增大,尾翼受到气缸内活塞的推动在炮膛内部张开,从而使尾翼片与膛线剧烈碰撞而使尾翼损坏,出炮口后尾翼无法正常工作。研究结果对该型制导弹药气缸张开式尾翼的设计和改进有重要参考价值。

  20. Analysis and design for structural stress of T320 floor boring apron%T320落地镗溜板箱结构应力分析与设计

    Institute of Scientific and Technical Information of China (English)

    杨顺田; 杨天雄; 彭美武

    2012-01-01

    In order to solve rough machining problem of the above 300 tons large and super large components of mill,large,ultra-heavy boring and milling machine is required in urgentTherefore,T320 digital display type boring machine was developed in this contextThrough studying the machine column, the thermal equilibrium system as well as the inertia parameters matching and the spindle apron structure, the machine column was designed particularly into a closed cross-section of welded structures with the shock filler being injected into,which may change the traditional casting structural design;Then through cloud analysis on the contact state of the apron with columns and track,the structure was optimized;Temperature compensation system was adopted to ensure the heat balance of bearing system,and meet the extra requirements for rough machining large pieces ,which main design highlights the characteristics of large, heavy machine design.%为了解决300t以上特大型焊接件、特大型轧机的粗加工难题,急需大型、超重型落地铣镗床.T320数显落地镗就是在这种背景下研制的.通过对机床立柱、热平衡系统、惯量参数匹配与主轴溜板箱结构等内容的研究,特别是将机床立柱设计成封闭式截面的焊接结构,并在其结构内注入防震填料,改变了传统的铸件结构设计;再通过对溜板箱与立柱和轨道的接触状态云分析,对其结构进行优化;采用温度补偿系统保证轴承热系统平衡,满足了特大型件的粗加工要求,其主要设计思想彰显出大型、超重型机床设计的特色.

  1. Borehole geophysics for delineating the geological structure in the Sakonishi prospect, the Hida area, Japan; Hida chiiki Sako nishi chiku ni okeru boring ko riyo butsuri tansa ni yoru chishitsu kozo kaiseki

    Energy Technology Data Exchange (ETDEWEB)

    Katayama, H.; Hishida, H.; Yoshioka, K. [Metal Mining Agency of Japan, Tokyo (Japan)

    1997-05-27

    In order to discuss effectiveness of physical exploration in the Sakonishi prospect in the Hida area, physical exploration was carried out by utilizing bored wells. This area contains the Kamioka mine, one of the major base metal mines in Japan, where electrical exploration has been attempted several times in the past. No effective results have been obtained, however, because specific resistance contrast between mine beds and base rocks is too small, and the topography is too steep making site workability inferior. As part of the investigations on geological structures over wide areas, electrical logging (specific resistance and natural potential) was performed in fiscal 1995 and 1996 by utilizing the boreholes. Induced polarization logging was also conducted on the same boreholes. A traverse line on the ground with a length of 600 m and boreholes were used to execute specific resistance tomography. Clear extraction was possible on a fault structure which is thought related with limestone distribution and mine bed creation. However, it was not possible to identify upward continuity of zinc ores expected in the exploration. Because of not large a specific resistance contrast between zinc ores and base rocks, it is difficult to find mine bed locations only from the information on the specific resistance. 5 refs., 5 figs., 1 tab.

  2. Research of Factors Affecting Stabili ation of Hole Wall of Bored Pile%钻孔灌注桩孔壁稳定性的影响因素研究

    Institute of Scientific and Technical Information of China (English)

    王中文

    2011-01-01

    以某大型桥梁近接工程为背景,采用专业岩土工程有限元软件Plaxis,对钻孔灌注桩孔壁稳定性的影响因素进行了数值分析研究.研究结果表明:若无邻近老桩基影响,孔径、孔深、泥浆相对密度、护筒深度及成孔时间是钻孔灌注桩孔壁稳定的主要影响因素;在邻近老桩基的影响下,护筒保护和护筒穿越土层的合理深度是可以将两邻近桩基相互影响降到最低的保证.以上研究结果的应用可提高钻孔效率,并可有效控制超近距离建(构)筑物桩基施工的破坏性影响,保证施工安全.%Based on a large bridge approaching construction, the numerical analysis of influencing factors of stabilization of hole wall was performed by using the geotechnical engineering finite element analytical software Plaxis. The research result indicates that (1) without considering the influence of adjacent old pile foundation, aperture, hole depth, specific gravity of slurry, protective barrel depth and hole forming time are key influencing factors which affect the stabilization of hole wall of bored pile; (2) considering the influence of adjacent old pile foundation, protective barrel and the proper depth of protective barrel are assurances which may reduce the interrelationship of new pile foundation and adjacent old pile foundation. The application of this research result can increase efficiency of drilling, effectively control the impact of two extremely close adjacent pile foundations, ensure construction safety.

  3. Rapid Construction Technology for a Shallow-buried Bored Tunnel in Sandy Pebble Stratum%砂卵石地层浅埋暗挖法快速施工技术

    Institute of Scientific and Technical Information of China (English)

    刘魁刚; 王文正; 裴书锋

    2011-01-01

    The running tunnel of phase three of the Beijing Subway Line 4 passes through a sandy pebble stratum, which creates construction risks of surrounding rock collapse, tunnel bottom swell, sand outflow and soil settlement above the roof. It also affects the road and bridge safety and results in difficult drilling and grouting. This paper addresses the optimization of the design and grouting parameters of small conduits and discusses the construction principles of "early covering, fine short tube, less disturbance, quick setting, abutment reinforcing and middle slotting" regarding the bored tunnel with a shallow overburden at the sandy pebble stratum. The construction technology of the bench method is introduced, which includes the key points of counter core soil excavation, small conduit grouting and locking anchor pipe, with a monthly advance rate of 60~70 m.%北京地铁四号线三期区间隧道穿越砂卵石地层,存在围岩易塌落、隧道底部起鼓和涌砂、顶板上方土体沉降,影响道路和桥梁安全等施工风险,并且不易钻孔注浆,工效较低.针对以上问题,改进了小导管设计参数和注浆参数,提出了砂卵石地层浅埋暗挖法“早封面、管细短、少扰动、快凝固、固拱脚、中拉槽”施工原则,施工效果较好,月进度达60~70 m.文章介绍了砂卵石地层台阶法施工工艺,提出了下台阶反核心土开挖,以及小导管注浆和锁脚锚管施工要点.

  4. Osedax borings in fossil marine bird bones

    OpenAIRE

    Kiel, Steffen; Kahl, Wolf-Achim; Goedert, James

    2010-01-01

    The bone-eating marine annelid Osedax consumes mainly whale bones on the deep-sea floor, but recent colonization experiments with cow bones and molecular age estimates suggesting a possible Cretaceous origin of Osedax indicate that this worm might be able grow on a wider range of substrates. The suggested Cretaceous origin was thought to imply that Osedax could colonize marine reptile or fish bones, but there is currently no evidence that Osedax consumes bones other than those of mammals. We ...

  5. Does Being Bored Make Us More Creative?

    Science.gov (United States)

    Mann, Sandi; Cadman, Rebekah

    2014-01-01

    Boredom has traditionally been associated with a range of negative outcomes, both within the workplace and outside it. More recently, however, it has been suggested that boredom can have positive outcomes, one of which might be increased creativity. This study addressed this proposition by examining the relationship between boredom and creative…

  6. Why is archaeometry so boring for archaeologists

    International Nuclear Information System (INIS)

    This is a tentative for shaking the intellectual confort of physicists, chemists and mathematicians working for archaeology. It is a well-known fact that the meetings for archaeometry attract more and more scientists, but archaeologists, in principle directly interested in the methods, the objects and the results of the work are not present in a significant amount in those meetings. The aim of this paper is a brief analysis of this phenomenon and of various solutions attempted. It would be simplistic attributing only to archaeologists the responsability of this situation. In fact some archaeometrists are happy with it. Also, the archaeological impact of a few communications in the Archaeometry Symposia is low, either from the hit pursued or because the results are irrelevant for misuse of methods, or inconsistent sampling. Technical details interesting only a small circle are sometimes explained in large sessions. They are not only problems of organization common to any large congress but could be a sign of a scientific community loosing sometimes a clear consciousness of its own object. The organization of the interdisciplinary permanent team in Orsay-Saclay is presented as a search for keeping a good link between laboratory and field work. The choosen example, the study of the Gallo-Roman production and trade of amphorae, is studied in a methodological point of view showing the interest of permanent exchange and control of the historical validity of the results without neglecting the technical needs for building up relevant data

  7. The Bored Self in Knowledge Work

    DEFF Research Database (Denmark)

    Costas, Jana; Kärreman, Dan

    2016-01-01

    This article draws attention to reported experiences of boredom in knowledge work. Drawing on extensive qualitative data gathered at two management consultancy firms, we analyze these experiences as a particular interaction with identity regulation and work experiences. We conceptualize the reports...

  8. Lapping and Polishing an Elliptical Bore

    Science.gov (United States)

    Loggan, John J., Jr.; Meyer, Scott D.

    1987-01-01

    Numerically controlled milling machine modified to make head reciprocate. Modification accomplished by removal of original milling head from machine and by mounting vertical slide in its place. Vertical slide driven up and down by connecting rod bolted off-center to drive pulley. Pulley driven by belt from variable-speed electric motor. Milling-machine head then attached to vertical slide. Mechanism allowed independent control of reciprocating surface speed through variation of speed of electric motor.

  9. What Makes Jobs Monotonous and Boring?

    Science.gov (United States)

    Quinn, Robert P.

    Direct observations of the jobs of 370 workers were used to explain perceptions of monotony and feelings of boredom associated with work. Of the several observational measures of task characteristics that were constructed, the most efficient predictor of monotony and boredom was the number of times during a fixed period that the most…

  10. Research on the accuracy reliability of super-heavy computerized numerical control (CNC) boring-mill machine tools%超重型数控镗铣床精度可靠性研究

    Institute of Scientific and Technical Information of China (English)

    胡占齐; 解亚飞; 刘金超

    2011-01-01

    In order to solve the key technical problem in maintenance of heavy CNC machine tools, the concept of precision reliability and its forecasting module were proposed. The method is used especially to research the reliability of heavy machine tools for which samples are not adequate to carry out statistical methods of research. The spatial error module was established first for a type of super-heavy mill and boring machine tool based on multi-body kinematics. The effect of the wearing of the kinematic pair of machine tools on machining precision was then researched, and forecasting modules for the maintenance period and premature wearing of heavy CNC machine tools were developed. The method proposed can be used in calculating the maintenance period of heavy machine tools, analyzing the source of machining errors, and producing an optimal design of the total life of CNC machine tools. It can also be used for research of the reliability of similar products in a single piece or small batch.%针对重型数控机床可靠性研究中批量小、难以形成足够的统计样本数的特点,提出了精度可靠性的概念及其预测模型,旨在解决重型数控机床维护和维修的关键技术问题.应用多体运动学方法建立了某型号超重型落地铣镗床的空间误差模型,研究了机床运动副磨损量对加工精度的影响,进而得出了重型数控机床维护周期和初期磨损的预测模型.提出的方法可以用于重型数控机床维护周期的计算、机床加工过程中误差源的分析和基于全寿命周期的数控机床优化设计.该方法也可用于其他单件小批量产品的可靠性研究.

  11. 采用小直径TBM进行长大隧道导洞施工的讨论%Discussion on Construction of Pilots of Long and Large Cross-section Tunnels Bored by Small-diameter TBMs

    Institute of Scientific and Technical Information of China (English)

    刘春

    2011-01-01

    介绍采用小直径开敞式TBM进行超前平导施工的意义、目的和国外采用小直径TBM进行超前导洞施工的实例;分析国内采用小直径开敞式TBM进行超前导洞施工的可行性;总结进行超前导涧施上时选择开敞式TBM的考虑因素.得出以下结论:利用小直径开敞式TBM进行长大隧道超前导涮施工,符合国家对基本建设的环保和安全的要求;当前的综合国力和施工技术水平也具备了相应的条件;选择小直径TBM时应考虑其特点,并满足"快速掘进、探明地质、支持正洞"的要求.%The significance and targets of pilot tunnels constructed by small-diameter open TBMs are presented, cases of pilot tunnels constructed by small-diameter open TBMs abroad are listed, the feasibility to build pilot tunnels by smalldiameter open TBMs is analyzed and factors to be considered in the selection of small-diameter open TBMs in the construction of pilot tunnels are summarized. Conclusions drawn are as follows: 1 ) The concept to build pilot tunnels by small-diameter open TBMs meets the requirements of the state for the infrastructure construction in terms of environment protection and safety; 2) The comprehensive national capability and the construction technologies have reached the relevant requirements; 3 ) The features of small-diameter open TBMs should be taken into full consideration and the requirements of rapid boring, geology probing and assistance to the main tunnel construction should be satisfied.

  12. Numerical Study on Waterproof Failure Mechanism of Elastic Sealing Gasket of Underwater Shield-bored Tunnel%水下盾构隧道弹性密封垫防水失效数值模拟研究

    Institute of Scientific and Technical Information of China (English)

    王湛

    2015-01-01

    In the paper,numerical simulation study is made on the waterproof failure mechanism of elastic sealing gaskets by means of ABAQUS program,with the design of the waterproof system of an underwater shield-bored tunnel as example.The finite element model used in the paper is compared with the previous simplified model,and the waterproof failure mechanism of elastic sealing gaskets in the case of joint opening and that in the case of joint staggering are analyzed respectively.Conclusions drawn are as follows:1 )In the case of joint opening,the water leakage mainly occurs at the contact surface between the sealing gaskets;2)In the case of joint staggering,the water leakage at the contact surface between the sealing gaskets turns into water leakage at the contact surface between the sealing gasket and the concrete segment as the staggering displacement grows.%结合某水下盾构隧道工程的防水设计,采用大型有限元软件 ABAQUS 对弹性密封垫的防水失效机理进行数值模拟研究。将本文有限元模型与前人简化模型进行了对比分析,并对接缝张开及接缝错开情况下的密封垫防水失效机理进行了分析。研究表明,在接缝张开的情况下,渗漏主要发生在密封垫间的接触面上;接缝错开的情况下,随错缝位移的增大,渗漏将由发生在密封垫接触面上而转变为发生在密封垫与混凝土间的接触面上。

  13. SU-E-J-03: Characterization of the Precision and Accuracy of a New, Preclinical, MRI-Guided Focused Ultrasound System for Image-Guided Interventions in Small-Bore, High-Field Magnets

    Energy Technology Data Exchange (ETDEWEB)

    Ellens, N [Johns Hopkins University, Baltimore, Maryland (United States); Farahani, K [National Cancer Institute, Bethesda, MD (United States)

    2015-06-15

    Purpose: MRI-guided focused ultrasound (MRgFUS) has many potential and realized applications including controlled heating and localized drug delivery. The development of many of these applications requires extensive preclinical work, much of it in small animal models. The goal of this study is to characterize the spatial targeting accuracy and reproducibility of a preclinical high field MRgFUS system for thermal ablation and drug delivery applications. Methods: The RK300 (FUS Instruments, Toronto, Canada) is a motorized, 2-axis FUS positioning system suitable for small bore (72 mm), high-field MRI systems. The accuracy of the system was assessed in three ways. First, the precision of the system was assessed by sonicating regular grids of 5 mm squares on polystyrene plates and comparing the resulting focal dimples to the intended pattern, thereby assessing the reproducibility and precision of the motion control alone. Second, the targeting accuracy was assessed by imaging a polystyrene plate with randomly drilled holes and replicating the hole pattern by sonicating the observed hole locations on intact polystyrene plates and comparing the results. Third, the practicallyrealizable accuracy and precision were assessed by comparing the locations of transcranial, FUS-induced blood-brain-barrier disruption (BBBD) (observed through Gadolinium enhancement) to the intended targets in a retrospective analysis of animals sonicated for other experiments. Results: The evenly-spaced grids indicated that the precision was 0.11 +/− 0.05 mm. When image-guidance was included by targeting random locations, the accuracy was 0.5 +/− 0.2 mm. The effective accuracy in the four rodent brains assessed was 0.8 +/− 0.6 mm. In all cases, the error appeared normally distributed (p<0.05) in both orthogonal axes, though the left/right error was systematically greater than the superior/inferior error. Conclusions: The targeting accuracy of this device is sub-millimeter, suitable for many

  14. 基于互联网的隧道掘进机故障筛选及预警系统开发%The Development of Tunnel Boring Machine Malfunction Screening and Early Warning System Based on Internet

    Institute of Scientific and Technical Information of China (English)

    张迅博

    2015-01-01

    国内盾构机在施工时,在盾构机掘进过程中时常会遇到各种突发情况,然而报警信息无法及时传递到技术专家手中,这为盾构施工埋下了安全隐患。为解决这一困难,文章设计了一套基于互联网的隧道掘进机故障筛选及预警系统,能实现实时搜集多台盾构机施工中的报警信息,通过因特网汇集到远端服务器,利用故障筛选及预警系统,实时向技术专家,业主,监理发出预警短信。系统保障了施工人员及机械的安全,提高了管理效率节约了项目成本。%Domestic Shield in the construction,in the course of the shield tunneling machine often encounter a variety of emergency situations,but the alarms information can not be delivered in time to the hands of technical experts,which buried a security risk for the shield construction.To address this problem,design a tunnel boring machine malfunction screening and early warning system based on the Internet,can achieve real-time collection of multiple shield machine construction alarm information collection to the remote server through the Internet, the use of screening and early warning failure system, real-time early warning messages to technical experts,owners, supervision.The system protects the safety of construction workers and machinery,and the same time the system improves the management efifciency savings in project costs.

  15. 数控落地铣镗床滑枕变形有限元分析及补偿∗%FEM Analysis and Compensation of the Ram Deformation of CNC Floor Type Boring Milling Machine Tool

    Institute of Scientific and Technical Information of China (English)

    余剑武; 桂林; 李民选; 罗嗣春; 张汉卫

    2015-01-01

    TK6920B型大型数控落地镗铣床由于滑枕自质量和主轴箱的重心偏移而导致滑枕变形,从而影响机床的加工精度。针对这一问题,提出使用挠曲线预应力加工法和液压拉杆法对滑枕变形进行补偿,为了减少实验次数和降低成本,本文使用Ansys WB有限元软件对滑枕变形分析和变形补偿效果进行预测。对滑枕变形量的仿真分析结果和实验测量结果进行了对比分析,结果表明,滑枕变形量的误差在5μm 以下,有限元分析结果是可靠的;补偿后的滑枕最大变形量为20μm左右,说明了补偿方法的补偿效果可以满足实际生产中加工精度的要求。%TK6920B CNC floor type boring and milling machine is a type of heavy duty machine tool, and it is easy to generate flexural deformation during the extension of its ram due to its weight and the gravitational off-center of the ram and the headstock,which affects the machining accuracy during process-ing.In order to solve this problem,the prestress flexural deflection machining method and hydraulic rod compensation method were proposed.Ansys WB software was applied to analyze and predict the ram flex-ural deformation and compensation effect so that it can cut down experiment cost.By comparing the meas-ured flexural deformation of the ram with the finite element method (FEM)simulation results,it shows that deformation error is controlled within 5μm,the FEM simulation results are reliable and the total ram deformation is about 20μm.It is proved that proposed compensation methods are also effective and can meet the requirements of machining.

  16. SU-E-J-03: Characterization of the Precision and Accuracy of a New, Preclinical, MRI-Guided Focused Ultrasound System for Image-Guided Interventions in Small-Bore, High-Field Magnets

    International Nuclear Information System (INIS)

    Purpose: MRI-guided focused ultrasound (MRgFUS) has many potential and realized applications including controlled heating and localized drug delivery. The development of many of these applications requires extensive preclinical work, much of it in small animal models. The goal of this study is to characterize the spatial targeting accuracy and reproducibility of a preclinical high field MRgFUS system for thermal ablation and drug delivery applications. Methods: The RK300 (FUS Instruments, Toronto, Canada) is a motorized, 2-axis FUS positioning system suitable for small bore (72 mm), high-field MRI systems. The accuracy of the system was assessed in three ways. First, the precision of the system was assessed by sonicating regular grids of 5 mm squares on polystyrene plates and comparing the resulting focal dimples to the intended pattern, thereby assessing the reproducibility and precision of the motion control alone. Second, the targeting accuracy was assessed by imaging a polystyrene plate with randomly drilled holes and replicating the hole pattern by sonicating the observed hole locations on intact polystyrene plates and comparing the results. Third, the practicallyrealizable accuracy and precision were assessed by comparing the locations of transcranial, FUS-induced blood-brain-barrier disruption (BBBD) (observed through Gadolinium enhancement) to the intended targets in a retrospective analysis of animals sonicated for other experiments. Results: The evenly-spaced grids indicated that the precision was 0.11 +/− 0.05 mm. When image-guidance was included by targeting random locations, the accuracy was 0.5 +/− 0.2 mm. The effective accuracy in the four rodent brains assessed was 0.8 +/− 0.6 mm. In all cases, the error appeared normally distributed (p<0.05) in both orthogonal axes, though the left/right error was systematically greater than the superior/inferior error. Conclusions: The targeting accuracy of this device is sub-millimeter, suitable for many

  17. Evaluation of Vibration and Vibration Fatigue Life for Small Bore Pipe in Nuclear Power Plants%反应堆GGR系统辅助管系稳态振动评估与振动疲劳寿命分析

    Institute of Scientific and Technical Information of China (English)

    王兆希; 薛飞; 龚明祥; 遆文新; 林磊; 刘鹏

    2011-01-01

    根据美国机械工程师标准(ASME-OM-S/G2000)规范及法国电力公司(EDF)标准振动评估方法,提出一套用于核电站小支管振动评估及振动疲劳寿命分析的方法,应用该方法对国内某核电站汽轮机润滑顶轴盘车(GGR)系统的辅助小支管振动问题进行评估研究,并计算了小支管系统的允许有效速度.根据振动速度的测量和计算结果进行敏感性评估;采用响应谱计算方法对管座处的应力水平进行计算,并与允许振动交变应力进行比较;采用瞬态动力学方法对管座处的应力时程响应进行计算,根据Miners线性损伤累积模型对管座的振动疲劳寿命进行评估.结果表明谱响应计算得到的振动交变应力幅值高于评估准则的振动交变应力允许值,该管线属于振动敏感管线;而通过瞬态振动寿命计算得到稳态振动疲劳寿命远远高于设计寿命,有较大的安全裕量.%The assessment method of the steady state vibration and vibration fatigue life of the small bore pipe in the supporting system of the nuclear power plants is proposed according to the ASME-OM3 and EDF evaluation methods. The GGR supporting pipe system vibration is evaluated with this method. The evaluation process includes the filtration of inborn sensitivity, visual inspection, vibration tests, allowable vibration effective velocity calculation and vibration stress calculation. With the allowable vibration effective velocity calculated and the vibration velocity calculated according to the acceleration data tested, the filtrations are performed. The vibration stress at the welding coat is calculated with the spectrum method and compared with the allowable value. The response of the stress is calculated with the transient dynamic method, with which the fatigue life is evaluated with the Miners linear accumulation model. The vibration stress calculated with the spectrum method exceeds the allowable value, while the fatigue life

  18. Analytic Study on the Damages of Wood-boring Isopod, Sphaeroma,to China Mangroves%中国红树林蛀木团水虱危害分析研究

    Institute of Scientific and Technical Information of China (English)

    范航清; 刘文爱; 钟才荣; 倪翔

    2014-01-01

    [Objective]Damages to mangroves due to the presence of wood-boring isopod of Sphaeroma are newly found in China.Aiming to control the isopod disaster,this paper evalu-ates the status of isopod damages to China mangroves,analyzes the possible causes and puts forward some management tactics,and some scientific issues about massive occurrence of Sphaeroma in China are discussed.[Methods]Analyses were made on the information from field surveys conducted at three damaged mangrove sites in Hainan and Guangxi province,and the tests of isopod controls by calcium oxide killing and fish feeding.[Results]Field surveys re-vealed that areas of destructive mangroves in Dongzhaigang,Hainan increased at a mean contin-uous rate of 66.4% annually mangroves from 2010 to 2013.The major mangrove wood-boring isopods in China are Sphaeroma terebrans and Sphaeroma retrolaeve ,of which the former is the key species found in Dongzhaigang.All of the mangroves damaged by borers distribute in the sea regions suffering serious anthropogenic disturbance and contamination.The attack of borers focuses on the forests growing across the creeks delivering pollutants and at the habitats depositing pollutants.Mature mangrove forests, being high relatively and in late successional stage of zonality,are vulnerable to the damage. Mangrove species preferred by the borers can be ranked in an order: Bruguiera sexangula , Bruguiera gymnorrhiza > B.s.var .rhynchopetala ,Ceriops tagal > Avicennia marina , Kandelia obovata > Aegiceras corniculatum .Attributing to different tide amplitude,the height of above ground part of mangroves which the borers are able to attack is more than two times along China mainland coast than in Hainan Island.Laboratory test showed that 50% iso-pod individuals can be killed by calcium oxide at the weight concentration of 1 ∶ 1 to water through 90 minutes treatment.The feeding rate of fish,Bostrichthys sinensi ,on isopod is rela-tively stable at unit time,and 42 isopod individuals

  19. The Tensile Capacity Of Bored Piles In Frictional Soils

    DEFF Research Database (Denmark)

    Krabbenhøft, Sven; Andersen, Allan; Damkilde, Lars

    2008-01-01

    Three series of 10 piles each were installed in two different locations. The length of the piles varied from 2 to 6 m and the diameters were 14 and 25 cm. The piles were constructed above the groundwater table using continuous flight augers and the concrete was placed by gravity free fall. The pi...... piles were tested to failure in axial uplift and the load-displacement relations were recorded....

  20. A METHOD OF PROVIDING BURR-FREE BORES

    DEFF Research Database (Denmark)

    2004-01-01

    By thermal-based removal of material, for instance by way of laser drilling or laser ablation, the material is removed from the article (2) in form of steam or drops. The material is removed by being subjected to a short-term intense laser pulse (4) causing a generation of considerable pressure...... additional local steam/plasma pressure causing the ejected material to change direction in such a manner that the surface of the material is not damaged or a stricking burr is not formed. The local steam/plasma pressure can, for instance, be provided by an intense secondary laser beam being emitted downwards...

  1. Circular tests for HSM machine tools: Bore machining application

    OpenAIRE

    Tapie, Laurent; Mawussi, Kwamiwi; Anselmetti, Bernard

    2007-01-01

    Today's High-Speed Machining (HSM) machine tool combines productivity and part quality. The difficulty inherent in HSM operations lies in understanding the impact of machine tool behaviour on machining time and part quality. Analysis of some of the relevant ISO standards (230-1998, 10791-1998) and a complementary protocol for better understanding HSM technology are presented in the first part of this paper. These ISO standards are devoted to the procedures implemented in order to study the be...

  2. A large bore quadrupole magnet for calibration of rotating coils

    International Nuclear Information System (INIS)

    A large aperture quadrupole magnet (aperture diameter 310 mm) is designed, developed and magnetically tested for the use of calibrating the rotating coils of harmonic bench model 692, supplied by M/s Denfysik A/S, Denmark. The cross-section of the quadrupole magnet was determined by computing the gradient distribution with the two-dimensional magneto static program POISSON. The pole profile is a hyperbolic curve with a tangent to produce 3.2 T/m quadrupole field gradient with the higher order multipole field errors in the range of 5E-04. The poles were tapered and return back leg were optimized to get field values below 1.7 T, in order to reduce the hysteresis effect. Two different excitation coils having different conductor sizes are designed to utilize the available space in the magnet geometry for obtaining maximum field gradient. The magnet design produces a field gradient of 3.2 Tim in the magnet aperture diameter of 0.31 m. The magnet yoke is fabricated using thick pre machined low carbon steel plates and the excitation coils are from water cooled hollow copper conductors. The steel length, width and height of the magnet are 310 mm, 1630 mm and 1630 mm respectively. The geometrical accuracy in the magnet pole aperture is maintained to 310 ± 0.08 mm. The total weight of the magnet is about 4800 Kg. The systematic higher order multipoles which are obtained using 3D calculations are in concurrent with the measured data using harmonic bench. Two tangential coils having major coil radius 138 mm were calibrated using this magnet. The details of magnetic design, magnet development, calibration of rotating coils and the magnetic measurements will be discussed in this paper. (author)

  3. Ectomycorrhizal inoculation of willows on cut-over bored peatland

    Energy Technology Data Exchange (ETDEWEB)

    Loree, M.; Lumme, I.; Niemi, M.; Toermaelae, T.

    1988-05-01

    Ectomycorrhizal fungal inoculation was explored as a means to improve productivity of experimental short-rotation plantations of the willows Salix viminalis L. and Salix dasyclados Wimm. for biomass production on surface-mined peatlands in northern Finland. Both willow species formed ectomycorrhizas with Amanita spp., Cortinarius purpurascens, Entoloma nidorosum and other Entoloma spp., Hebeloma crustuliniforme, H. pusillum, Laccaria bicolor, and Paxillus involutus in greenhouse experiments. Field trials on a mined peatland site revealed (after one growing season) statistically significant growth stimultion due to inoculation, but these results were sometimes attributable to non-symbiotic effects of inoculation. Inoculation with some Entoloma isolates resulted in additional field growth stimulation due to symbiotic effects both willow species: plants inoculated with Entoloma were sometimes twice as large as control plants. however, such effects were observed only in plots receiving normal phosphate fertilization 40-80 kg as opposed to low 10-40 kg application and were not consistent from season to season.

  4. Average is Boring: How Similarity Kills a Meme's Success

    Science.gov (United States)

    Coscia, Michele

    2014-09-01

    Every day we are exposed to different ideas, or memes, competing with each other for our attention. Previous research explained popularity and persistence heterogeneity of memes by assuming them in competition for limited attention resources, distributed in a heterogeneous social network. Little has been said about what characteristics make a specific meme more likely to be successful. We propose a similarity-based explanation: memes with higher similarity to other memes have a significant disadvantage in their potential popularity. We employ a meme similarity measure based on semantic text analysis and computer vision to prove that a meme is more likely to be successful and to thrive if its characteristics make it unique. Our results show that indeed successful memes are located in the periphery of the meme similarity space and that our similarity measure is a promising predictor of a meme success.

  5. Repetitive, small-bore two-stage light gas gun

    International Nuclear Information System (INIS)

    A repetitive two-stage light gas gun for high-speed pellet injection has been developed at Oak Ridge National Laboratory. In general, applications of the two-stage light gas gun have been limited to only single shots, with a finite time (at least minutes) needed for recovery and preparation for the next shot. The new device overcomes problems associated with repetitive operation, including rapidly evacuating the propellant gases, reloading the gun breech with a new projectile, returning the piston to its initial position, and refilling the first- and second-stage gas volumes to the appropriate pressure levels. In addition, some components are subjected to and must survive severe operating conditions, which include rapid cycling to high pressures and temperatures (up to thousands of bars and thousands of kelvins) and significant mechanical shocks. Small plastic projectiles (4-mm nominal size) and helium gas have been used in the prototype device, which was equipped with a 1-m-long pump tube and a 1-m-long gun barrel, to demonstrate repetitive operation (up to 1 Hz) at relatively high pellet velocities (up to 3000 m/s). The equipment is described, and experimental results are presented. 124 refs., 6 figs., 5 tabs

  6. Lonely or Bored: Children's Lived Experiences Reveal the Difference

    Science.gov (United States)

    Kirova, Anna

    2004-01-01

    In spite of the growing body of research on loneliness, the relationship between the phenomena of loneliness and boredom has not been sufficiently addressed, especially in respect to children. The question, "How does the child's experience of boredom stand phenomenologically in relation to the experience of loneliness?" is explored from a…

  7. Bewitched, Bothered, and Bored: Harry Potter, The Movie.

    Science.gov (United States)

    Nel, Philip

    2002-01-01

    Explores the Harry Potter phenomenon with college students in a university course. Compares the first book with the first movie. Presents an in-depth discussion of the movie and how it relates to the book. (SG)

  8. Lymská borelióza u psa

    OpenAIRE

    Horáčková, Pavlína

    2014-01-01

    Lyme borreliosis (Lyme disease) is a tick-borne disease caused by spirochetes of the genus Borrelia. It affects canines, humans and other warm-blooded animals. It manifests itself mainly by physical disabilities and that of nervous system, skin and heart. Its occurence in the Czech Republic is relatively frequent as well as the incidence of the main carriers of ticks (Ixodes Ricinus). Among the major reservoirs of the disease agent are rodents, deer, pets. The greatest risk of infection oc...

  9. Green girls and bored boys? Adolescents' environmental consumer learning

    DEFF Research Database (Denmark)

    Grønhøj, Alice

    2006-01-01

    An untraditional method of data construction - written essays - was used to study consumer socialisation processes related to 'green' consumerism. The study primarily aimed at exploring how adolescents perceive of environmental issues and learn about these issues in a family context. Results show...

  10. 1000m depth boring at Inagawa, Hyogo prefecture. 1. Overviews; Hyogoken Inagawamachi ni okeru 1000m boring chosa. 1. Gaiyo

    Energy Technology Data Exchange (ETDEWEB)

    Sato, T.; Kusunose, K.; Cho, A.; Tosha, T. [Geological Survey of Japan, Tsukuba (Japan); Kiyama, T.; Yamada, F. [Mitsui Construction Co. Ltd., Tokyo (Japan); Aizawa, T. [Sancoh Consultants Co. Ltd., Tokyo (Japan)

    1996-05-01

    Various field experiments were carried out using a 1000m deep borehole at Inagawa town, about 10km north of the focus of the Hanshin-Awaji Great Earthquake and directly above the area where shallow earthquake activities have intermittently occurred. These experiments included stress measurement by hydraulic fracturing, hydrophone-aided VSP, permeability tests and observation of various types of logging. The laboratory experiments were also carried out, including measurement of various properties and stresses of the core samples. The stress-depth relationship, determined by the hydraulic fracturing method, shows that the stress gradient well coincides with the Western Japan standard at a depth up to 700m, whereas it is approximately twice as high as the standard at a depth of 946m, at which core disking and borehole break-out are clearly observed, and hence stresses conceivably concentrate locally. Orientation of the maximum horizontal compressive stress is E-W at a depth of around 600m, but greatly changes to NNW-SSE at a deeper position. 4 refs., 5 figs.

  11. Lattice dynamics of {alpha} boron and of boron carbide; Proprietes vibrationnelles du bore {alpha} et du carbure de bore

    Energy Technology Data Exchange (ETDEWEB)

    Vast, N

    1999-07-01

    The atomic structure and the lattice dynamics of {alpha} boron and of B{sub 4}C boron carbide have been studied by Density Functional Theory (D.F.T.) and Density Functional Perturbation Theory (D.F.P.T.). The bulk moduli of the unit-cell and of the icosahedron have been investigated, and the equation of state at zero temperature has been determined. In {alpha} boron, Raman diffusion and infrared absorption have been studied under pressure, and the theoretical and experimental Grueneisen coefficients have been compared. In boron carbide, inspection of the theoretical and experimental vibrational spectra has led to the determination of the atomic structure of B{sub 4}C. Finally, the effects of isotopic disorder have been modeled by an exact method beyond the mean-field approximation, and the effects onto the Raman lines has been investigated. The method has been applied to isotopic alloys of diamond and germanium. (author)

  12. 基于有限元的超重型数控落地铣镗床静力学特性分析%Static behaviors analysis of super-heavy-duty CNC floor boring-milling machine based on finite element method

    Institute of Scientific and Technical Information of China (English)

    吴凤和; 高东东; 王振宇

    2012-01-01

    以TK6932超重型数控落地铣镗床为研究对象,针对其可能存在局部强度和刚度不足的问题,利用有限元方法进行计算验证.首先,根据机床结构特点建立了机床整机的有限元模型,基于该模型对机床整机进行静力分析,计算了机床在20种工作位置时自重作用下的应力和变形,进一步对滑枕静刚度进行了计算,分析了滑枕变形与工作位置间的关系.有限元分析结果表明,机床各部分应力水平较低,最大应力20 MPa左右,满足强度要求,而滑枕行程在1000 ~2000 mm范围时其挠曲变形量超过了国家机械行业标准,必须进行变形补偿.%Take the TK6932 super-heavy-duty CNC floor boring-milling machine as research object, the possible intensity and rigidity insufficient of the local structure are analyzed by the finite element method in the paper. Firstly, the finite element model of the whole machine is established according to the structural characteristics of the machine tool. Then the static analysis of the machine is given based on the model. The stress and deformation of the machine tool under the self-weight in 20 specific positions are calculated at the same time. Furthermore, the static stiffness of the ram is calculated and the relationship between deformation and work position of the ram is analyzed. The results of the finite element analysis show that the stress level of the machine is low in every part of the model, and the maximum stress is a-bout 20 MPa, which meet the requirements of strength. However, with the stroke of the ram in the range of 1 000 mm to 2 000 mm, the deflections exceed the national standard of mechanical industry. In this case, the deformation of ram must be compensated.

  13. 高硅铝合金无缸套发动机缸体缸孔珩磨加工数控机床关键技术研究%Research on Key Technologies of High-silicon Aluminum Alloy No-cylinder-liner Engine Block Cylinder Bore Honing CNC Machine Tool

    Institute of Scientific and Technical Information of China (English)

    余阿东; 王平俊; 李翔龙

    2016-01-01

    Based on high⁃silicon aluminum alloy no⁃cylinder⁃liner engine block bore materials grinding characteristics, a dual⁃spindle CNC honing machine tool was developed. In the machine tool, two⁃position two⁃spindle honing layout was used, it consisted of the following modules:spindle box, column, column glide, workpiece clamping table and so on. Spindle honing dual feed mechanism and honing oilstone double feed body were adopted. A closed loop control system based on motion control card was used. The system hardware platform was IPC and general industrial motion control card, based on the pneumatic differential pressure measuring honing online system, processing volume closed⁃loop control was achieved. The software platform was Windows system, VC++ development tool was used to program specialized processing procedures for the honing process.%基于高硅铝合金无缸套发动机缸体缸孔材料的磨削特点,开发了一种数控双主轴珩磨机床。该机床采用二工位双主轴的珩磨加工布局,由以下模块组成:主轴箱、立柱、立柱下滑台、工件装夹工作台等;采用主轴珩磨双进给机构及珩磨头油石双涨机构;采用基于运动控制卡的全闭环控制系统,系统硬件平台采用工控机和通用工业运动控制卡,运用基于差压式珩磨在线气动测量系统,实现加工量的闭环控制;软件平台采用Windows系统,采用VC++开发工具编制珩磨工艺加工程序。

  14. Comparing T1-weighted and T2-weighted three-point Dixon technique with conventional T1-weighted fat-saturation and short-tau inversion recovery (STIR) techniques for the study of the lumbar spine in a short-bore MRI machine

    International Nuclear Information System (INIS)

    Aim: To compare T1-weighted (W) fat–water separation (Dixon's technique) with T1W fat-saturation (FS) and T2W Dixon with short-tau inversion recovery (STIR) images for fat suppression in a short-bore MRI machine. Materials and methods: Thirteen patients with lumbar disease were studied on using 1.5 T MRI machine. The protocol included T1 FS (with contrast medium administration) and/or STIR and T1W and/or T2W Dixon, for comparison. Three neuroradiologists scored the images from the two-pairs of techniques for fat suppression uniformity and lesion conspicuity. Clinical usefulness of fat-only images was also evaluated. Results: Regarding uniformity of fat suppression, mean scores were 2.28 (±0.49), 3.06 (±0.49), 2.39 (±0.49), and 3.15 (±0.35) for T1W FS, T1W Dixon, STIR, and T2W Dixon sequences, respectively. For the same pulse sequences, lesion conspicuity scores were 2.78 (±0.50), 2.78 (±0.27), 2.76 (±0.47), and 2.91 (±0.4), respectively. Both T1W and T2W Dixon sequences showed more homogeneous fat-suppression when compared to T1W FS (p = 0.026) and STIR (p = 0.008) techniques, but no significant difference was found for lesion conspicuity. Mean scores for the diagnostic utility of fat-only maps were, respectively, 1.72 (±0.39) and 2.48 (±0.50) for T1W and T2W Dixon. Conclusion: Fat suppression quality was superior with Dixon when compared to the conventional sequences, but not lesion conspicuity, suggesting that both techniques are reliable for diagnosis. Dixon may be advantageous in cases where inhomogeneity artefacts are an issue. Water-only maps appear to be useful in the clinical setting

  15. Well-bore effects in the analysis of two-phase geothermal well tests

    Energy Technology Data Exchange (ETDEWEB)

    Miller, C.W.; Benson, S.; O' Sullivan, M.J.; Pruess, K.

    1981-01-01

    A method of designing and analyzing pressure transient well tests of two-phase (steam-water) reservoirs is given. Wellbore storage is taken into account and the duration of it is estimated. It is shown that the wellbore flow can completely dominate the downhole pressure signal such that large changes in the downhole pressure that might be expected because of changes in kinematic mobility are not seen. Changes in the flowing enthalpy from the reservoir can interact with the wellbore flow so that a temporary plateau in the downhole transient curve is measured. Application of graphical and non-graphical methods to determine reservoir parameters from drawdown tests is demonstrated.

  16. Boring and excavation technologies for Opalinus clay in the rock laboratories at Mont Terri

    International Nuclear Information System (INIS)

    This comprehensive article discusses the work done since 1996 at the rock laboratories at Mont Terri in the Swiss Jura Mountains. The work being done by fifteen international partners on the characterisation of the Opalinus clay with regard to its geological, hydro-geological, geochemical and geotechnical characteristics is reported on. Various methods of drilling are described that are able to preserve any tectonic crevices in the rock. Drilling under special conditions, including the use of nitrogen and argon atmospheres to prevent bacterial contamination, is looked at, as are the methods used in tunnelling without having to use water

  17. "One a Bird Bore Off": Anglo-Saxon and the elegiac in The Cantos'

    OpenAIRE

    Jones, Chris

    2001-01-01

    This article provides an explanation and context for Pound's quotation from the Old English poem 'The Wanderer' at the start of 'Canto 27' and discusses the previously unacknowledged stylistic and rhythmical debts to Old English in 'Canto 28'. The article argues that Pound sees this 'saxonist' style specifically as elegiac and deploys it accordingly.

  18. Analysis of the Tunnel Boring Machine Advancement on the Bologna-Florence Railway Link

    Directory of Open Access Journals (Sweden)

    M. Cardu

    2009-01-01

    Full Text Available Problem statement: The high-velocity railway link between Bologna and Firenze (Italy is today under construction and several tunnels have to be excavated for this purpose, some of these using TBMs. A small diameter tunnel, named Cunicolo ginori, was realized by TBM parallel to a large railway tunnel (Vaglia, at the distance of only 35 m. Approach: The Vaglia tunnel had been excavated by conventional methods and provided, thanks to a detailed survey and a systematic geotechnical monitoring (rock quality evaluation and convergence measurements the characterization data of the crossed rock mass; moreover the TBM performance data in Cunicolo ginori were continuously monitored. A tunnel stretch, 587 m long, was recorded and the analysis of the data from both surveys allowed to correlate the geomechanical parameters of the rock-mass to the TBM performances (net advancement rate, thrust, specific energy. Results: Based on this large amount of data a new system to predict the net TBM advancement rate for a tunnel in rock masses of known geological and geomechanical characteristics was then developed. Also the Utilization Coefficient (CU can be correlated to the rock quality Indices: The net advance rate and the utilization coefficient provide a mean to foresee the gross advancement rate and to evaluate the suitability of a machine for the excavation of a tunnel. Conclusion: In this study, an analysis had been carried out on about 587 m of a service tunnel, excavated by a TBM in a flysch formation.

  19. The Tunnel Boring Machine Advancements in Horizontal and Up-Hill Tunnels

    Directory of Open Access Journals (Sweden)

    Stefano Fuoco

    2009-01-01

    Full Text Available Problem statement: Nowadays high levels of experience have been acquired in the excavation of horizontal tunnels using TBM, especially as far as tunnels with small diameters (about 4 m wide are concerned. Less experience has been acquired in the excavation of tunnels under difficult alignment conditions, as in the case of steeply inclined excavations (up-hill tunnels. Approach: This study presented the results of studies which compare the production data collected for tunnels excavated with TBM in "normal" conditions (horizontal tunnel, with those derived from steeply inclined excavations (up-hill tunnels. Results: From an examination of the results obtained in the studied cases a net difference appears evident in terms of productivity between horizontal and up-hill excavations. Conclusion: Such net difference between horizontal and up-hill excavation productions can be attributed to the greater burdens of times necessary for the supply of materials and personnel, the regripping operations with fall preventer systems and, in general, the greater difficulties of carrying out ordinary and extraordinary maintenance of the machines in particularly difficult altrimetric conditions.

  20. Microwave emission from pulsed, relativistic e-beam diodes. I. The smooth-bore magnetron

    International Nuclear Information System (INIS)

    Measurements of intense magnetron oscillations in pulsed, field-emission diodes (approx.350 kV, 30 nsec) subjected to crossed externally applied fields (< or approx. =16 kG) are reported. The oscillations set in as soon as the magnetic field exceeds the critical field necessary for cutting off the diode current. The oscilations are diagnosed by the microwave emission which is studied in the range from 7 to 40 GHz. The radiation is emitted in broad frequency bands, it is strongly polarized, and can be tuned by the magnetic field; the power levels are typically 1 to 5 kW. The observations are consistent with the onset of the slipping stream instability in the Brillouin space charge flow of the electron cloud

  1. Investigations on the geothermal state of the ICDP COSC-1 well bore

    Science.gov (United States)

    Löwe, Richard; Pascal, Christophe; Renner, Jörg

    2016-04-01

    In 2014 the first well of the Collisional Orogeny in the Scandinavian Caledonides (COSC) ICDP project was drilled near Åre in west central Sweden. The well penetrates the Seve Nappe complex, a result of subduction/exhumation processes during the collision of Baltica and Laurentia ~ 400 Myrs ago (Gee et al. 2010). To gain a more detailed understanding of the geothermal state of fossil mountain belts and cratonic areas, it is necessary to study present-day heat transfer in the earth's crust in appropriate deep boreholes. Constraining the heat transfer requires temperature measurements in boreholes and determination of thermal properties of the rocks present. The specific object of our study is to derive a local thermal model providing the pristine thermal state and quantifying transient effects, i.e. paleoclimatic and convective effects, on the local geotherm. The outstanding core recovery (~ 100%) of the 2495.8 m (MD) deep well in combination with extensive wireline logging campaigns provide an exceptional basis for a broad range of core measurements and well log correlations. A total of 105 core samples, representing all major lithologies, were carefully selected for laboratory investigations, such as determining heat capacity, thermal conductivity, and thermal diffusivity. Density and thermal conductivity were determined for each of the 105 core samples under ambient pressure and unsaturated conditions. The thermal conductivity was measured using the optical scanning method (Popov et al. 1985) providing a first-order estimate of thermal properties along the cores' surfaces. Based on these preliminary measurements, a thermal conductivity profile was constructed, showing a steep increase towards the lower section of the well. For the first ~ 2000 m the average thermal conductivity amounts to 2.5±0.6 W/(m.K) and increases to 4.1±1 W/(m.K) in the lower section of the well. In addition, spectral gamma ray logs were used to determine the amount of radiogenic heat production (Rybach, 1988). The integrated heat production within the well is merely low and amounts to ~3.3 mW/m². Three temperature logs were measured about one week, one month, and one year after drilling. The observed gradual slowdown in temperature recovery suggests that the latest log was probably measured very close to thermal equilibrium. Furthermore, the latest temperature log appears to show a typical curvature reflecting sudden global warming at the Pleistocene-Holocene transition. Based on the latest temperature log an uncorrected average thermal gradient of ~21 °C/km is tentatively proposed. References: Gee, D. G.; Juhlin, C.; Pascal, C.; Robinson, P. (2010): Collisional Orogeny in the Scandinavian Caledonides (COSC). In GFF 132 (1), pp. 29-44. Rybach, L. (1988): Determination of Heat Production Rate. In R. Haenel, L. Rybach, L. Stegena (Eds.): Handbook of terrestrial heat-flow density determination. Guidelines and recommendations of the International Heat Flow Commission, pp. 125-142. Popov, Y. A.; Berezin, V. V.; Semenov, V. G.; Korostelev V. M. (1985): Complex Detailed Investigations on the Thermal Properties of Rocks on the Basis of a Moving Point Source. In Izvestiya, Earth Physics 21 (1), pp. 64-70.

  2. Development of remote bore tools for pipe welding/cutting by YAG laser

    International Nuclear Information System (INIS)

    In D-T burning reactors such as International Thermonuclear Experimental Reactor (ITER), an internal access welding/cutting of blanket cooling pipe with bend sections is inevitably required because of spatial constraint due to nuclear shield and available port opening space. For this purpose, an internal access pipe welding/cutting using YAG laser beam is being developed according to the agreement of the ITER R and D task (T44). A design concept of welding/cutting processing head with a flexible optical fiber has been developed and the basic feasibility studies on welding, cutting and rewelding are performed using stainless steel plate (SS316L). In this report, the details of a welding/cutting head with a flexible optical fiber for YAG laser are described, together with the basic experiment results relating to the welding/cutting and rewelding. (author)

  3. Two-dimensional particle simulation of boring effect in overdense plasmas

    International Nuclear Information System (INIS)

    As an intense, nonuniform ultrashort laser pulse strikes the overdense plasma, the electron mass increases and the electron plasma frequency decreases due to relativistic effect. Laser wave can penetrate the plasma more deeply. When laser beam is nonuniform, a channel forms as a result of strong ponderomotive force which is clearly shown by two-dimensional particle simulation

  4. The impact of heavy-weight drill pipe on the spectrum of longitudinal oscillations boring tool

    OpenAIRE

    Левчук, Катерина Григорівна

    2015-01-01

    When drilling holes in the operation breed destructive tool and drill string are destroyed as a result of elastic vibrations and static and external loads. Therefore, the actual problem is the study of the spectrum of natural vibrations of the drill string, depending on its layout (number of sections), the total length of the sections, the cross-section of drill pipe. The development of methods for determining the frequency range for each configuration of the drill string will predict the eme...

  5. Simulation of Drill String Vibration inside Well Bore due to Riser’s Oscillation

    OpenAIRE

    N. Al-Batati; F.M. Hashim; K.S. Pao

    2014-01-01

    This study attempts to explain the motion behavior of the marine riser coupled to drill string when the vortex induced vibration is involved. Vibrations have been reported to have a major effect on drilling performance, affecting the Rate of Penetration (ROP), causing severe damage to drilling tools and also reduces the efficiency of the drilling process. There are two major components of drilling tools that are subjected to vibration, namely the marine riser and the drilling string. Analysis...

  6. Simulation of Drill String Vibration inside Well Bore due to Riser’s Oscillation

    Directory of Open Access Journals (Sweden)

    N. Al-Batati

    2014-01-01

    Full Text Available This study attempts to explain the motion behavior of the marine riser coupled to drill string when the vortex induced vibration is involved. Vibrations have been reported to have a major effect on drilling performance, affecting the Rate of Penetration (ROP, causing severe damage to drilling tools and also reduces the efficiency of the drilling process. There are two major components of drilling tools that are subjected to vibration, namely the marine riser and the drilling string. Analysis of vibration in the marine riser and drill string are two topical areas that have individually received considerable attention by researchers in the past. While these two subjects are interrelated, borne by the fact that the marine riser encapsulates and protects the drill pipe, they have been little attempt to investigate them together as an assembly. Due to the complexities of the models, simplifying assumptions were made in order to undertake the investigation. Using staggered approach, the results were compared with experimental and simulation data from the open literature. It was found that the maximum displacement with negative damping occurs at low frequency and rotation speed. The addition of vortex shedding forces caused the drill string to deform from its vertical axis and thus increased the risk of failure of drill string and riser.

  7. 46 CFR 148.04-13 - Ferrous metal borings, shavings, turnings, or cuttings (excluding stainless steel).

    Science.gov (United States)

    2010-10-01

    ... (excluding stainless steel). 148.04-13 Section 148.04-13 Shipping COAST GUARD, DEPARTMENT OF HOMELAND... stainless steel). (a) This section applies to the stowage and transportation in bulk of hazardous materials... steel). However, unmanned barges on which the article is stowed for or transported on a voyage...

  8. [Suicidal gunshot to the nape from a small-bore rifle].

    Science.gov (United States)

    Lüderwald, Sybille; Mützel, Elisabeth; Graw, Matthias; Eisenmenger, Wolfgang; Peschel, Oliver

    2008-01-01

    A 55-year-old man was found dead on the bed lying on his side in a pool of blood with a bullet entrance hole in the nape. Behind his body, a semi-automatic rifle Remington Nylon, cal. .22 LR, was detected. As the gunshot entrance site was rather unusual for suicide, a forensic autopsy was performed, which showed a contact shot to the nape with the bullet path running upward to the left frontal area. The man had been treated with citalopram for delusional depression, so that a suicidal act seemed plausible, and the autopsy and criminalistic findings were also compatible with this assumption. A remarkable fact of the present case is that a long firearm had been used. Reports on suicidal shots to the nape are comparatively rare in the medicolegal literature and usually refer to pistols or revolvers. PMID:18389862

  9. Testing of the large bore single aperture 1-meter superconducting dipoles made with phenolic inserts

    CERN Document Server

    Boschmann, H; Dubbeldam, R L; Kirby, G A; Lucas, J; Ostojic, R; Russenschuck, Stephan; Siemko, A; Taylor, T M; Vanenkov, I; Weterings, W

    1998-01-01

    Two identical single aperture 1-metre superconducting dipoles have been built in collaboration with HMA Power Systems and tested at CERN. The 87.8 mm aperture magnets feature a single layer coil wound using LHC main dipole outer layer cable, phenolic spacer type collars, and a keyed two part structural iron yoke. The magnets are designed as models of the D1 separation dipole in the LHC experimental insertions, whose nominal field is 4.5 T at 4.5 K. In this report we present the test results of the two magnets at 4.3 K and 1.9 K.

  10. Very deep borehole. Deutag's opinion on boring, canister emplacement and retrievability

    Energy Technology Data Exchange (ETDEWEB)

    Harrison, Tim [Well Engineering Partners BV, The Hague (Netherlands)

    2000-05-01

    An engineering feasibility study has been carried out to determine whether or not it is possible to drill the proposed Very Deep Borehole concept wells required by SKB for nuclear waste disposal. A conceptual well design has been proposed. All aspects of well design have been considered, including drilling tools, rig design, drilling fluids, casing design and annulus isolation. The proposed well design is for 1168.4 mm hole to be drilled to 500 m. A 1066.8 mm outer diameter (OD) casing will be run and cemented. A 1016 mm hole will be drilled to approximately 2000 m, where 914.4 mm OD casing will be run. This annulus will be sealed with bentonite slurry apart from the bottom 100 m which will be cemented. 838.2 mm hole will be drilled to a final depth of 4000 m, where 762 mm OD slotted casing will be run. All the hole sections will be drilled using a downhole hammer with foam as the drilling fluid medium. Prior to running each casing string, the hole will be displaced to mud to assist with casing running and cementing. The waste canisters will be run on a simple J-slot tool, with integral backup system in case the J-slot fails. The canisters will all be centralised. Canisters can be retrieved using the same tool as used to run them. Procedures are given for both running and retrieving. Logging and testing is recommended only in the exploratory wells, in a maximum hole size of 311.1 mm. This will require the drilling of pilot holes to enable logging and testing to take place. It is estimated that each well will take approximately 137 days to drill and case, at an estimated cost of 4.65 Meuro per well. This time and cost estimate does not include any logging, testing, pilot hole drilling or time taken to run the canisters. New technology developments to enhance the drilling process are required in recyclable foam systems, in hammer bit technology, and in the development of robust under-reamers. It is the authors conclusion that it is possible to drill the well with currently existing technology, although it represents one of the biggest challenges to be presented to the drilling industry.

  11. Improved design of hydroelectric projects : hydraulic roughness of TBM-bored tunnels. An experimental study.

    OpenAIRE

    Katarzyna Filipek; Anna Kasprzyk

    2011-01-01

    The purpose of this thesis is to link head loss coefficients in rough pipes to the physical roughness of the surface through measurements of head loss in fully turbulent flow. It is generally regarded that hydraulic roughness is some function of the height, spacing, density and nature of the physical roughness under consideration. Attempts have been made to link hydraulic roughness to physical roughness of an irregular surface. Those have, however, been incomplete and conducted at flow states...

  12. A 50 mm bore, 13 tesla superconducting magnet employing a prereacted multifilamentary Nb3Sn conductor

    International Nuclear Information System (INIS)

    Following the construction of two hybrid magnets, we intend to build up a third hybrid magnet which will produce about 30 T. A prereacted multifilamentary Nb3Sn conductor will be employed for the 12 T superconducting part of the hybrid. As a first step for the project, we have designed, constructed and tested a magnet which consists of 14 double-pancakes made of a prereacted multifilamentary Nb3Sn conductor and a back up coil made of a Nb-Ti conductor. The satisfactory results of the test on the magnet, in which we succeeded to produce 13.4 T, have given us very bright prospects for the 30 T hybrid magnet project

  13. A 50 mm BORE, 13 TESLA SUPERCONDUCTING MAGNET EMPLOYING A PREREACTED MULTIFILAMENTARY Nb3Sn CONDUCTOR

    OpenAIRE

    Noto, K.; Watanabe, K; Muto, Y; M. Ikeda; Tanaka, Y.; Inoue, I; Ban, M

    1984-01-01

    Following the construction of two hybrid magnets, we intend to build up a third hybrid magnet which will produce about 30 T. A prereacted multifilamentary Nb3Sn conductor will be employed for the 12 T superconducting part of the hybrid. As a first step for the project, we have designed, constructed and tested a magnet which consists of 14 double-pancakes made of a prereacted multifilamentary Nb3Sn conductor and a back up coil made of a Nb-Ti conductor. The satisfactory results of the test on ...

  14. Inspection of rotor bores, retaining rings and turbine discs utilizing UDRPS

    International Nuclear Information System (INIS)

    New construction in the U.S. utility industry is at a very low level. The average age of plants in increasing almost linearly with time, many units will pass nominal end of life in the next decade. Planned new construction now takes ten years to effect at a minimum. The need for more reliable inspection of high stress utility components is and will continue to be a subject of increased emphasis. Dynacon Systems Inc. has recently introduced into commercial service, a fully automated ultrasonic inspection instrumentation package designed to significantly increase the reliability of turbine/generator rotor shaft, LP disc and generator retaining ring inspections. The package is designed to automate to a very high degree, the entire analysis process, thus eliminating operator error sources. The automated process begins at the ultrasonic pulse generator and ends with the input to fracture mechanics analysis

  15. Horizontal directional pre-bored cone penetration test (HD-PB-CPT)

    International Nuclear Information System (INIS)

    The emergence of horizontal directional drilling (HDD) as a new technology for soil remediation was discussed. One advantage of the technology, among others, is that with HDD technology it is possible to install a single horizontal well that is in direct contact with a comparatively large contaminated area, hence horizontal well systems can be more cost effective over the life of a remediation project due to potentially lower pumping and treatment costs. The technology can also be valuable in tunneling design. In drilling a horizontal well, continuous characterization of the borehole can be a valuable aid in improving the remediation design. HDD provides the potential for developing a cone penetration test (CPT) in which the probe can be pulled rather than pushed, thus eliminating the buckling problem of the push rods. It is also possible to install environmental sensors on the CPT for screening for non-aqueous phase liquid pools in the wellbore in a simpler and more cost effective way. The risk of spreading the contamination is also reduced. 12 refs., 3 figs

  16. Florida’s primary results: a boring story with a sad ending for Senator Marco Rubio

    OpenAIRE

    Darlington, Rolda L.

    2016-01-01

    With 99 delegates, Florida is one of the most important states in this stage of the presidential primary season. Tuesday’s Republican primary saw Donald Trump win all but one of the Sunshine State’s 67 counties, and all of its delegates. Rolda L. Darlington writes that while the results were not surprising, they were devastating for the state’s US Senator Marco Rubio, who had been banking on a win there to stay in the presidential nomination race.

  17. What to do when feeling bored? : Students' strategies for coping with boredom

    OpenAIRE

    Nett, Ulrike; Götz, Thomas; Daniels, Lia Marie

    2010-01-01

    The goal of this study was to explore different strategies for coping with boredom. A questionnaire was developed targeting two dimensions of coping, namely approach versus avoidance oriented coping and cognitive versus behavioral oriented coping. First, based on the responses of 976 students (51% female) from grades 5 to 10, the structure of the coping with boredom scales was verified by confirmatory factor analysis. In a second step, 3 different boredom-coping groups were identified by late...

  18. The Affects of Not Reading: Hating Characters, Being Bored, Feeling Stupid

    Science.gov (United States)

    Poletti, Anna; Seaboyer, Judith; Kennedy, Rosanne; Barnett, Tully; Douglas, Kate

    2016-01-01

    This article brings recent debates in literary studies regarding the practice of close reading into conversation with Derek Attridge's idea of "readerly hospitality" (2004) to diagnose the problem of students in undergraduate literary studies programme not completing set reading. We argue that the method of close reading depends on…

  19. [Technique and results of modified percutaneous bore wire osteosynthesis of the distal radius].

    Science.gov (United States)

    Habernek, H; Schmid, L

    1992-07-01

    A modified technique for percutaneous K-wire pinning of distal radius fractures is presented. With this method, three to four K-wires are introduced from the radial styloid process towards and through the dorsal, volar and ulnar proximal cortical wall, respectively. After the fracture fragments have been demonstrated to be stable, the wires are cut, bent over and fixed. Then a dorsal plaster splint is applied, which should be worn for 4-6 weeks, depending on whether or not there is a dorsal comminution zone. Fifty-five patients have been operated on by this method. At follow-up 6 months after the operation, no secondary dislocation, wire migration, infection, Sudeck syndrome or functional disturbance was seen. The advantage of this method is emphasized as compared with the usual, previously published method. PMID:1502573

  20. INFLUENCE OF WINE ACID ON RHEOLOGICAL PROPERTIES OF WELL BORE CEMENT SLURRIES AND HARDENED CEMENT PROPERTIES

    Directory of Open Access Journals (Sweden)

    Nediljka Gaurina-Međimurec

    1989-12-01

    Full Text Available Adaptation of commercial types of domestic cements for use in cementing the deep wells is a process by which Yugoslav oil industry tends to solve problems of completion of those wells independently. In order to design a domestic, cheep and effective retarder, tests of applicability of wine acid on cement slurries have been carried out. Besides examining the necessary wine acid content to achieve desirable Theological properties, the influence of this additive on properties of hardened cement samples has been tested too (the paper is published in Croatian.

  1. Prediction of response and damaged length of a subsea pipeline after a full bore rupture

    OpenAIRE

    Mashayekh, Kourosh

    2012-01-01

    The combination of oil and gas reservoirs in sea areas with high shipping traffic brings some challenges for engineers. One of these challenges is related to subsea pipeline systems specially where water depth is classified as shallow or intermediate. Due to large number of vessels passing the area with shallow water depth, interaction between anchors of these vessels and the offshore pipeline can occur. If a dragging anchor hits and subsequently hooks the pipeline, the pipeline could be rupt...

  2. Overview of Bore Tools Systems for divertor remote maintenance of ITER

    International Nuclear Information System (INIS)

    Because of the radiation levels preventing direct, hands-on access to the machine components, maintenance work on ITER will eventually require the use of Remote Handling techniques. In particular, the replacement of components such as divertor and blanket modules will require the use of remote cutting, welding and Non Destructive Testing of water cooling pipes

  3. Laser-Hole Boring into Overdense Plasmas Measured with Soft X-Ray Laser Probing

    Energy Technology Data Exchange (ETDEWEB)

    Takahashi, K. [Institute of Laser Engineering, Osaka University, Yamada Oka 2-6, Suita, Osaka 565-0871, (Japan); Kodama, R. [Institute of Laser Engineering, Osaka University, Yamada Oka 2-6, Suita, Osaka 565-0871, (Japan); Tanaka, K. A. [Institute of Laser Engineering, Osaka University, Yamada Oka 2-6, Suita, Osaka 565-0871, (Japan); Hashimoto, H. [Institute of Laser Engineering, Osaka University, Yamada Oka 2-6, Suita, Osaka 565-0871, (Japan); Kato, Y. [Institute of Laser Engineering, Osaka University, Yamada Oka 2-6, Suita, Osaka 565-0871, (Japan); Mima, K. [Institute of Laser Engineering, Osaka University, Yamada Oka 2-6, Suita, Osaka 565-0871, (Japan); Weber, F. A. [University of California, Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550 (United States); Barbee, T. W. Jr. [University of California, Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550 (United States); Da Silva, L. B. [University of California, Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550 (United States)

    2000-03-13

    A laser self-focused channel formation into overdense plasmas was observed using a soft x-ray laser probe system with a grid image refractometry (GIR) technique. 1.053 {mu}m laser light with a 100 ps pulse duration was focused onto a preformed plasma at an intensity of 2x10{sup 17} W /cm{sup 2} . Cross sections of the channel were obtained which show a 30 {mu}m diameter in overdense plasmas. The channel width in the overdense region was kept narrow as a result of self-focusing. Conically diverging density ridges were also observed along the channel, indicating a Mach cone created by a shock wave due to the supersonic propagation of the channel front. (c) 2000 The American Physical Society.

  4. Aims and results of the bore-hole development project of the Mecsek Coal Mines (Hungary)

    International Nuclear Information System (INIS)

    A project for the joint development of methodology and instrumentation was launched by the Mecsek Coal Mines in order to increase the efficiency of geophysical prospecting. Actual field examples are presented showing the detection of tectonic disturbances by radioactive logging methods from exploratory holes. Results of comparative measurements by means of scintillation and GM-tube detectors using various radiation sources (60Co, 241Am, 90Sr and 137Cs) are given in detail. (Sz.J.)

  5. Using a Bore Sight Camera as an AR&D Sensor Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Orion requires a rendezvous and docking sensor to provide relative navigation information during proximity operations and docking. In order to dock, the sensor must...

  6. Electrophoretic Separation of Biomolecules within Narrow-Bore Capillaries with nanoESI-MS Detection

    Czech Academy of Sciences Publication Activity Database

    Týčová, Anna; Kovaříková, P.; Foret, František

    2015. s. 110-110. ISBN N. [HPLC 2015. International Symposium on High Performance Liquid Phase Separations and Related Techniques /43./. 21.09.2015-25.09.2015, Beijing] Institutional support: RVO:68081715 Keywords : interface * CE-MS * dexrazoxane Subject RIV: CB - Analytical Chemistry, Separation http://www.hplc2015-beijing.org/upload/absrarctbook.pdf

  7. Utilization of deep shaft for bore-hole disposal of radioactive waste from nuclear applications

    International Nuclear Information System (INIS)

    The Novi Han Repository is the only existing repository in Bulgaria for the disposal of radioactive waste from nuclear applications in industry, medicine and research. The disposal vault for spent sealed sources is not designed for disposal of powerful 137Cs and 60Co sources. Long-lived waste from nuclear applications is also not allowed for disposal at the Novi Han Repository. As an operator of the Novi Han Repository, the Institute for Nuclear Research and Nuclear Energy (INRNE) initiated a programme for assessment of the possible utilization of deep shaft Gabra for disposal of such waste. Results of the preliminary study are discussed. (author)

  8. Report of boring made in the South of Cerro Largo district (Cerro Largo) 1977-1978

    International Nuclear Information System (INIS)

    The present work are within the framework and compiles the data obtained by means of the study of the perforations executed in the District Cerro Largo Sur of the detailed prospection of uranium minerals. This study was carried out by technicians of Geologic ex--Institute of Uruguay (IGU) - at the moment National Direction of Mining and Geology. (DINAMIGE). The works began at the beginning of 1977 and continued until 1978 July; The headquarters of the program of prospection of uranium was carried out by Ing. Hector Goso. In this report the conclusions drawn at the time of the detection of the works in the District already published, as well as the litologicos cuts of all the executed perforations are included

  9. "School Is So Boring": High-Stakes Testing and Boredom at an Urban Middle School

    Science.gov (United States)

    Mora, Richard

    2011-01-01

    Existing evidence suggests that high stakes exams result in little increased learning among students. Yet, given the federal mandates for greater accountability, such as No Child Left Behind (NCLB) legislation and Race to the Top policies, and the "pervasive testing culture," the use of high-stakes tests is presently an accepted practice. The…

  10. What to Do when Feeling Bored?: Students' Strategies for Coping with Boredom

    Science.gov (United States)

    Nett, Ulrike E.; Goetz, Thomas; Daniels, Lia M.

    2010-01-01

    The goal of this study was to explore different strategies for coping with boredom. A questionnaire was developed targeting two dimensions of coping, namely approach versus avoidance oriented coping and cognitive versus behavioral oriented coping. First, based on the responses of 976 students (51% female) from grades 5 to 10, the structure of the…

  11. 'I was bored so...':motivational accounts of participation in an online emo group

    OpenAIRE

    Chernoff, Nathalie; Widdicombe, Sue

    2015-01-01

    We examine members' spontaneous accounts for joining and participating in an online emo forum. The Internet and social networking sites are central features of contemporary youth cultures; the analysis of interaction on emo forums can thus provide a way of appreciating emo as a 'Community in Practice'. We analyse popular discussion threads collected from a key emo website, using membership categorisation and conversation analysis. In these threads, members introduce themselves and account for...

  12. Study on seismic safety of the small bore piping and support system

    International Nuclear Information System (INIS)

    Since seismic safety is one of the major key issues of nuclear power plant safety, it has been demonstrated that nuclear piping system possesses large safety margins by various durability test reports for piping in ultimate conditions. Though the knowledge of safety margin has been accumulated from these reports, there still remain some technical uncertainties about the phenomenon when both piping and support structures show inelastic behavior in extremely high seismic excitation level. In order to obtain the influences of inelastic behavior of the support structures to the whole piping system response when both piping and support structures show inelastic behavior, we examined seismic proving tests and we conducted simulation analyses for the piping system which focused on the inelastic behavior of the support to the whole piping system response. This paper introduces major results of the seismic shaking tests of the piping and support system and the simulation analyses of these tests. (author)

  13. Ecology of the wood-boring bivalve Martesia striata (Pholadidae) in Indian waters

    Digital Repository Service at National Institute of Oceanography (India)

    Yennawar, P.L.; Thakur, N.L.; Anil, A.C.; Venkat, K.; Wagh, A.B.

    and January 1997. Effects of salinity variation on embryonic and larval development were evaluated (salinity 0, 10, 20, 30, 35, 40 and 50, temperature 25 degrees C) and maximum metamorphic success was observed at 30 salinity. Results of the rearing experiments...

  14. Zachsia zenkewitschi (Teredinidae), a Rare and Unusual Seagrass Boring Bivalve Revisited and Redescribed.

    Science.gov (United States)

    Shipway, J R; O'Connor, R; Stein, D; Cragg, S M; Korshunova, T; Martynov, A; Haga, T; Distel, D L

    2016-01-01

    The sea-grass borer Zachsia zenkewitschi belongs to a group of economically and ecologically important bivalves, commonly referred to as shipworms. The sole recognized representative of the genus Zachsia, this species displays an unusual life history and reproductive strategy that is now understood to include: environmental sex determination of free swimming larvae, extreme sexual and size dimorphism between males and females, internal fertilization, maintenance of often large harems of male dwarfs within a specialized cavity of the female mantle, and complex maternal care of larvae in specialized brood pouches within the gill. It is also the only shipworm species known to burrow in sea grass rhizomes rather than terrestrial wood. Although Z. zenkewitschi is rare and little studied, understanding of its biology and anatomy has evolved substantially, rendering some aspects of its original description inaccurate. Moreover, no existing type specimens are known for this species. In light of these facts, we designate a neotype from among specimens recently collected at the type location, and undertake a re-description of this species, accounting for recent reinterpretation of its life history and functional anatomy. PMID:27171209

  15. Fast image reconstruction experiments using small-bore MRI for animals

    International Nuclear Information System (INIS)

    Fast image reconstruction experiments were done using a high-speed image processor utilizing a digital signal processor chip (TMS320C30, Texas Instruments Inc) and a 4.7 T MR imager for animals (Biospec 47/40, Bruker Medizintechnik Gmbh). An image refresh time of 3.2s for a 128 x 128 matrix image was achieved using a fast gradient-echo sequence with a TR/TE/flip-angle of 20ms/6ms/30deg. MR images of a phantom and a rat were obtained repetitively and recorded on videotape over a long period. This system shows great promise for interventional MRI and also for the study of non-phasic motion such as movements of the gastrointestinal tract. (author)

  16. Study for effectiveness of rock mechanical model estimated from pilot boring survey

    International Nuclear Information System (INIS)

    In the Mizunami URL of Japan Atomic Energy Agency (JAEA), the study on engineering technology are ongoing. In this study, we tried to estimate the static elastic modulus from Rock Mass Rating (RMR) based on the results of laboratory test, core observation of the pilot borehole and geological survey on the shaft wall of main shaft in the URL. The static elastic modulus based on PS logging in a borehole as well. Then, the three dimensional numerical analysis using of the parameters carried out for the validity of the examination. The results show that the RMR may be applicable to estimate the mechanical parameters of strongly weathered rock mass which is widely distributed in JAPAN. (author)

  17. Method for constructing a lined underground cavity by underreaming, grouting, and boring through the grouting

    Science.gov (United States)

    Johnson, W.H.

    1971-02-02

    A method is described for constructing a lined underground cavity. The process includes the steps of securing a casing in a borehole by grouting, underreaming the casing, filling the underreamed region with additional grouting, and then drilling through and underreaming the added grouting, thereby forming a room having a lining formed of the grouting. By using a structurally strong grouting that is impervious to water, the resulting room is waterproof and is suitable for on-site storage of an atomic device and its associated equipment prior to an underground atomic event. Such cavities also have other uses; for example, the cavities may be made very deep and used for storage of various fluids such as natural gas storage. (5 claims)

  18. Why Kids Need to Be Bored: A Case Study of Self-Reflection and Academic Performance

    Science.gov (United States)

    Williams, James D.

    2006-01-01

    This case study involved 3 middle school students in an assessment of the influence of self-reflection on general academic performance. It was hypothesized that increased self-reflection would have a positive influence on academic performance as measured by grades on tests, writing assignments, and homework. The participants were ages 13.4, 13.5,…

  19. Ballet Doesn't Have to Be Boring: Engaging Students in the Creative Process

    Science.gov (United States)

    Scheff, Helene

    2005-01-01

    For many years, the author has incorporated creative process into the way she teaches ballet class. The author shares the philosophical, practical, and artistic reasons for the creative process in ballet classes. She also shares the rationale and how this practice developed over time.

  20. Adhesive properties of a symbolic bacterium from a wood-boreing marine shipworm

    International Nuclear Information System (INIS)

    Adhesive properties of cellulolytic, nitrogen-fixing bacterium isolated from a marine shipworm are described. 35S-labeled cells of the shipworm bacterium bound preferentially Whatman no.1 cellulose filter paper, compared with its binding to other cellulose substrata or substrata lacking cellulose. The ability of the bacteria to bind to Whatman no. 1 filter paper was significantly reduced by glutaraldehyde or heat treatment of cells. Pretreatment of cells with azide, valinomycin, gramicidin-D, bis-hexafluoroacetylacetone (1799), or carbonyl cyanide-p-trifluoromethoxyphenylhydrazone inhibited adhesion activity. Cells pretreated with pronase or trypsin also exhibited reduced binding activity, but chymotrypsin and peptidase had no effect on adhesion activity. Cellodextrins and methyl cellulose 15 inhibited the adhesion of the shipworm bacteria to filter paper, whereas glucose, cellobiose, and soluble carboxymethyl cellulose had no significant effect. The divalent cation chelators EDTA and EGTA [ethylene hlycol-bis(β-aminoethyl ether)-N,N,N'N'-tetraacetic acid] had little or no effect on adhesive properties of shipworm bacteria. Also, preabsorbing the substratum with extracellular endoglucanase isolated from the ship worm bacterium or 1% bovine serum albumin had no apparent effect on bacterial binding. Low concentration (0.01%) of sodium dodecyl sulfate solubilized a fraction from whole cells, which appeared to be involved in cellular binding activity. After removal of sodium dodecyl, sulfate, several proteins in this fraction associated with intact cells. These cells exhibited up to 50% enhanced binding to filter paper in comparison to cells which had not been exposed to the sodium dodecyl sulfate-solubilized fraction

  1. Very deep borehole. Deutag's opinion on boring, canister emplacement and retrievability

    International Nuclear Information System (INIS)

    An engineering feasibility study has been carried out to determine whether or not it is possible to drill the proposed Very Deep Borehole concept wells required by SKB for nuclear waste disposal. A conceptual well design has been proposed. All aspects of well design have been considered, including drilling tools, rig design, drilling fluids, casing design and annulus isolation. The proposed well design is for 1168.4 mm hole to be drilled to 500 m. A 1066.8 mm outer diameter (OD) casing will be run and cemented. A 1016 mm hole will be drilled to approximately 2000 m, where 914.4 mm OD casing will be run. This annulus will be sealed with bentonite slurry apart from the bottom 100 m which will be cemented. 838.2 mm hole will be drilled to a final depth of 4000 m, where 762 mm OD slotted casing will be run. All the hole sections will be drilled using a downhole hammer with foam as the drilling fluid medium. Prior to running each casing string, the hole will be displaced to mud to assist with casing running and cementing. The waste canisters will be run on a simple J-slot tool, with integral backup system in case the J-slot fails. The canisters will all be centralised. Canisters can be retrieved using the same tool as used to run them. Procedures are given for both running and retrieving. Logging and testing is recommended only in the exploratory wells, in a maximum hole size of 311.1 mm. This will require the drilling of pilot holes to enable logging and testing to take place. It is estimated that each well will take approximately 137 days to drill and case, at an estimated cost of 4.65 Meuro per well. This time and cost estimate does not include any logging, testing, pilot hole drilling or time taken to run the canisters. New technology developments to enhance the drilling process are required in recyclable foam systems, in hammer bit technology, and in the development of robust under-reamers. It is the authors conclusion that it is possible to drill the well with currently existing technology, although it represents one of the biggest challenges to be presented to the drilling industry

  2. Using a Bore Sight Camera as an AR&D Sensor Project

    Data.gov (United States)

    National Aeronautics and Space Administration — This Phase II SBIR project will provide real time, relative six Degree of Freedom (6DoF) information to the crew of the ORION for docking. Our technical innovation...

  3. Bridged polysilsesquioxane-based wide bore monolithic capillary columns for hydrophilic interaction chromatography

    Czech Academy of Sciences Publication Activity Database

    Moravcová, Dana; Šesták, Jozef; Křenková, Jana; Planeta, Josef; Kahle, Vladislav; Roth, Michal; Foret, František

    Veszprém : Hungarian Society for Separation Sciences, 2015. s. 75-75. ISBN 978-615-5270-18-5. [Balaton Symposium on High-Performance Separation Methods /10./. 02.09.2015-04.09.2015, Siófok] R&D Projects: GA MV VG20112015021; GA ČR(CZ) GA14-06319S; GA ČR(CZ) GBP206/12/G014 Institutional support: RVO:68081715 Keywords : hybrid organic -silica monolithic columns * hydrophilic interaction chromatography * separation of glycans Subject RIV: CB - Analytical Chemistry , Separation

  4. Stduy on the machining precision of the boring spindle bracket for CNC floor-type milling-boring machine%数控落地铣镗床镗轴托架加工精度研究

    Institute of Scientific and Technical Information of China (English)

    崔凤有; 陈雪芳; 孔凡武; 李德刚

    2014-01-01

    数控落地铣镗床镗轴精度是影响机床精度的关键因素,而镗轴托架是影响镗轴轴向窜动精度的关键件.镗轴托架加工精度要求十分严格,两端轴承孔同轴度要求在0.01 mm以内,轴承孔内端面跳动要求在0.005 nun以内.从设计原理和加工工艺方面分析以确定加工方案,满足精度要求.

  5. Le diamant dopé au bore pour la bioélectronique: Biocompatibilité et Fonctionnalisation

    OpenAIRE

    Agnes, Charles

    2009-01-01

    In order to produce electrodes for bioelectronic applications, polycrystalline and homoepitaxial (100) and (111) boron doped diamond films were synthesized. Those films were grown by plasma enhanced CVD and characterized by cathodoluminescence, Raman, and SEM. First, diamond biocompatibility was studied according to different parameters (doping, roughness and crystalline orientation), through the culture of two different cell lines: fibroblasts and pre-osteoblasts. Biotin was locally grafted ...

  6. Report on round robin activities on the calculation of crack opening behaviour and leak rates for small bore piping components

    International Nuclear Information System (INIS)

    Results of a bench mark test on crack opening and leak rate calculation are presented. The bench mark test is based on two experiments performed in phase III of the german HDR-Safety-Program which was sponsored by the German Federal Minister of Research and Technology (BMFT). The pipes considered in these experiments were a straight pipe with 80 mm diameter and a circumferential through wall crack as well as a pipe branch with a crack in the weldment between nozzle and main pipe. Both test pieces were made of austenitic steel and loaded by internal pressure and varying bending moment. The round robin was initiated by Principal Working Group No.3 (PWG-3) of the committee on the Safety of Nuclear Installations (CSNI), witch is part of OECD (Organization for Economic Cooperation and Development)'s Nuclear Energy Agency (NEA). Scientists of five institutions in four countries (Canada, USA, Czech Republic and Germany) participated in the bench mark test. For the evolution of the crack opening either analytical methods, estimation schemes or the finite element method were used, while leak rates were calculated by means of two-phase flow models. The compilation of the results shows very large scatter bands in general, with deviations equally large between the calculations of the different participants and the calculation and the measurements. To identify reasons for this scatter - probably originating from differences between the methods used and from uncertainties in the experiment - in detail, further evaluations were made meanwhile. These are described in chapter 9, witch is added to the draft report of June 1993 of the first phase. (authors). 17 refs., 51 figs., 14 tabs

  7. Acceptance test report for the ultra high pressure bore head for use in the self-installing liquid observation well

    International Nuclear Information System (INIS)

    In order to monitor and characterize waste stored in single-shell tanks, liquid observation wells (LOWs) have been installed to permit periodic insertion of instrumentation probes to evaluate the waste's cross-sections characteristics

  8. Hydrogeology of the Hawaii Scientific Drilling Project borehole KP-1 1. Hydraulic conditions adjacent to the well bore

    Science.gov (United States)

    Paillet, Frederick L.; Thomas, D.M.

    1996-01-01

    Temperature and formation resistivity logs obtained in borehole KP-1 of the Hawaii Scientific Drilling Project indicate that the adjacent formation is characterized by several zones of distinctly different average temperature and water salinity. A series of hydraulic analyses and water sampling programs were conducted to rule out the possibility of local hydraulic effects associated with the presence of the borehole in the generation of these apparent groundwater zones. Hydraulic tests and sampling with the borehole cased to a depth of 710 m and open below that depth indicate that the deep aquifer contains seawater at a temperature nearly identical to that of the open ocean at the same depth. Various analyses give estimates of aquifer transmissivity of about 10-3 m2/s in the vicinity of the borehole. Isolation of this deeper aquifer from the overlying groundwater zones was investigated by perforating the casing at six locations and then measuring the changes in water level in the borehole, in the salinity of the fluid column, in the temperature profile of the fluid column, and in the rate of flow in the fluid column induced by the perforations. These results positively confirm that the zones of distinctly different formation properties indicated on the temperature and resistivity logs are not caused by flow in or around casing. Flow and fluid column salinity induced by the perforations also confirm significant differences between the hydraulic heads and geochemistry of the different groundwater zones inferred from the well logs.

  9. Quantitative discrimination between oil and water in drilled bore cores via fast-neutron resonance transmission radiography

    OpenAIRE

    Vartsky, D.; Goldberg, M B; Dangendorf, V.; Israelashvili, I.; Mor, I.; Bar, D.; Tittelmeier, K.; Weierganz, M.; Breskin, A.

    2016-01-01

    A novel method based on Fast Neutron Resonance Transmission Radiography is proposed for non-destructive, quantitative determination of the weight percentages of oil and water in cores taken from subterranean or underwater geological formations. The ability of the method to distinguish water from oil stems from the unambiguously-specific energy dependence of the neutron cross-sections for the principal elemental constituents. Monte-Carlo simulations and initial results of experimental investig...

  10. Analysis of populations of boring and fouling organisms in the vicinity of the Oyster Creek nuclear generating station

    Energy Technology Data Exchange (ETDEWEB)

    Hoagland, K.E.; Crocket, L.

    1979-06-01

    The growth, distribution, and species composition of marine borers (primarily shipworms) and fouling organisms are being studied in the vicinity of the Oyster Creek Nuclear Generating Station, Barnegat Bay, New Jersey. Untreated wood test panels are used to collect organisms at 18 localities. Our most recent findings covering September--November, 1978, are that at least one subtropical species of the borer family Teredinidae continues to live in Oyster Creek; it now breeds at the mouth of Forked River. The subtropical Teredo bartschi living in Oyster Creek retained well-developed larvae in the gills through November, while the native species B. gouldi spawned out. The gonads of B. gouldi were vanishingly small in November. Larvae of T. bartschi settled in Oyster Creek and larvae of the native T. navalis settled on Long Beach Island in September, but no later. The last B. gouldi of the season settled in August. The greatest wood damage occurred at station 12 in Oyster Creek. Increased siltation on rocks in Oyster Creek decreased both the abundance and the diversity of fouling organisms. The introduced polychaete Mercierella enigmatica has been found in Oyster Creek as well as stations to the north.

  11. The perfect boring situation-Addressing the experience of monotony during crewed deep space missions through habitability design

    Science.gov (United States)

    Peldszus, Regina; Dalke, Hilary; Pretlove, Stephen; Welch, Chris

    2014-01-01

    In contemporary orbital missions, workloads are so high and varied that crew may rarely experience stretches of monotony. However, in historical long duration missions, occurrences of monotony were, indeed, reported anecdotally by crew. Of the effective countermeasures that appear to be at hand, many rely on visual or logistical proximity to the Earth, and are not feasible in the remote context of an extended deep space mission scenario. There, particularly in- and outbound cruising stages would be characterised by longer, comparably uneventful periods of low workload, coupled with confinement and unchanging vehicle surroundings. While the challenge of monotony has been pointed out as an exploration-related research area, it has received less explicit attention from a habitation design perspective than other human behaviour and performance issues. The paper addresses this gap through a literature review of the theory and application of design-based mitigation strategies. It outlines models of emergence of monotony, situates the phenomenon in a remote mission context as a problem of sensory, social and spatio-temporal isolation, and discusses proposed countermeasures related to habitability. The scope of the literature is extended to primary sources in the form of a qualitative review of six onboard diaries from orbital and simulator missions, highlighting a range of habitat-related design themes. These are translated into the autonomous deep space setting with the overall rationale of integrating affordances into onboard habitation systems and placing emphasis on reinforcing positive situational characteristics.

  12. Využitie sociálnych sietí pri nábore zamestnancov

    OpenAIRE

    Ondejková, Ľubomíra

    2015-01-01

    This bachelor thesis deals with social networks and their use in recruitment process. The aim is to assess whether social networks can become the main method for recruitment, to find out recruiters' opinion on the use of social networks and to compare these findings with the period of three years ago. Finally, also to characterize the selected social networks and to compare their applicability. The theoretical part is devoted to the introduction of human resource management and recruitment. I...

  13. MODELING AND ANALYSIS OF DYNAMICS IN BEARING SYSTEM OF DRILLING, MILLING AND BORING MACHINE WITH MONO-COLUMN

    Directory of Open Access Journals (Sweden)

    Yu. V. Vasilevich

    2015-05-01

    Full Text Available  FEM-analysis of dynamics in the bearing system of a heavy-duty machine tool has been carried out in the paper. This is a prospective variant for a large-size multi-purpose machine tool with a horizontal sliding ram. A saddle and a ram are moving vertically along a subtle mono-column. A rigid double-column is used in the existing analog machine tool. A static, modal and harmonic analysis of the bearing system with the mono-column has been made in the paper. It has been done with the help of FEM-simulation prior to fabrication of a prototype sample. Previously conducted calculations for the analog machine tool have shown good compatibility of FEM-calculation with experiments.Six common machine tool resonances have been revealed for the bearing system. Their oscillating cutting forces are actively exciting three-four resonance modes. Ranges of a flexure-torsion resonance (20–40 Hz and nose-diving resonances (70–90 Hz have been determined in the paper. The paper shows that the range of multi-wave resonances starts significantly higher from 140 Hz. These resonances are interconnected with bending oscillations of the ram and bucklings of the column walls which are matched with the oscillations. The paper demonstrates stability in resonance pattern. The torsional resonance of the column on the frequency of nearly 40 Hz is considered as the more dangerous one. Spindle rigidity goes down up to 3.8 Н/μm. It is possible to observe self-stabilization of the torsional resonance. Frequency of the torsional oscillations is practically unchangeable when there is a lifting or lowering down of the saddle and the ram. It is related to the migration of dynamical axis of torsion.Frequency-response characteristics of the bearing system have been constructed for various saddle positions on the column. Three frequency intervals that make it possible to carry out machining operation have been determined in the paper. The first interval is a static one. The machine tool with a mono-column comes short of the analog machine tool in this interval. The main reason of it is low static rigidity of the subtle column. The second interval is narrow and it is located between flexure-torsion and nose-diving resonances. The third interval is considered as the most efficient one. The interval contains a section of inter-range pause between general machine tool and multi-wave resonances. In this case it is possible to observe a significant increase of the dynamic rigidity on the spindle that compensates the column subtility. High potential of the dynamic rigidity has been revealed in the direction of the ram axis (>2000 Н/μm. The paper shows liability of the machine tool to displacement crossings during oscillations. Peculiar features of this effect have been discussed in the paper. The diagram with a mono-column is recommended for practical application. The main condition is a transition to high-speed drive within the framework of concept on high-speed machining. It is necessary to ensure rigidity of the axial feed drive system.

  14. Thermal-Induced Errors Prediction and Compensation for a Coordinate Boring Machine Based on Time Series Analysis

    Directory of Open Access Journals (Sweden)

    Jun Yang

    2014-01-01

    Full Text Available To improve the CNC machine tools precision, a thermal error modeling for the motorized spindle was proposed based on time series analysis, considering the length of cutting tools and thermal declined angles, and the real-time error compensation was implemented. A five-point method was applied to measure radial thermal declinations and axial expansion of the spindle with eddy current sensors, solving the problem that the three-point measurement cannot obtain the radial thermal angle errors. Then the stationarity of the thermal error sequences was determined by the Augmented Dickey-Fuller Test Algorithm, and the autocorrelation/partial autocorrelation function was applied to identify the model pattern. By combining both Yule-Walker equations and information criteria, the order and parameters of the models were solved effectively, which improved the prediction accuracy and generalization ability. The results indicated that the prediction accuracy of the time series model could reach up to 90%. In addition, the axial maximum error decreased from 39.6 μm to 7 μm after error compensation, and the machining accuracy was improved by 89.7%. Moreover, the X/Y-direction accuracy can reach up to 77.4% and 86%, respectively, which demonstrated that the proposed methods of measurement, modeling, and compensation were effective.

  15. Pulsed Ion Sheath Dynamics in a Cylindrical Bore for Inner Surface Grid-Enhanced Plasma Source Ion Implantation

    Institute of Scientific and Technical Information of China (English)

    王久丽; 张谷令; 范松华; 杨武保; 杨思泽

    2002-01-01

    Based on our recently proposed grid-enhanced plasma source ion implantation (GEPSII) technique for innersurface modification of materials with cylindrical geometry, we present the corresponding theoretical studiesof the temporal evolution of the plasma ion sheath between the grid electrode and the target in a cylindricalbore. Typical results such as the ion sheath evolution, time-dependent ion density and time-integrated ion energydistribution at the target are calculated by solving Poisson's equation coupled with fluid equations for collisionlessions and Boltzmann assumption for electrons using finite difference methods. The calculated results can furtherverify the feasibility and superiority of this new technique.

  16. Simultaneous effect of organic modifier and physicochemical parameters of barbiturates on their retention on a narrow-bore PGC column

    Czech Academy of Sciences Publication Activity Database

    Forgács, E.; Cserháti, T.; Mikšík, Ivan; Eckhardt, Adam; Deyl, Zdeněk

    2004-01-01

    Roč. 800, č. 1-2 (2004), s. 259-262. ISSN 1570-0232 Grant ostatní: CZ - HU(CZ) Cooperation programme Institutional research plan: CEZ:AV0Z5011922 Keywords : barbiturates * porous graphitized carbon Subject RIV: CB - Analytical Chemistry, Separation Impact factor: 2.176, year: 2004

  17. Bored boys, graffiti, and YouTube - tracing recent groundwater level changes in a Saudi Arabian cave

    Science.gov (United States)

    Michelsen, Nils; Dirks, Heiko; Schulz, Stephan; Kempe, Stephan; Schüth, Christoph

    2015-04-01

    The Dahl Hith cave is located approximately 30 km southeast of Riyadh, the capital of Saudi Arabia. In the past decades, the groundwater table exposed inside the cave became subject to appreciable changes. After a decline due to agricultural water abstraction for irrigation purposes, the water table exhibited a rapid rise in the last few years. Considering that most of the aquifers of the country show a depletion of the largely fossil groundwater, the mentioned rise is quite unusual. The area does not host an observation well, i.e., reliable data on the piezometric changes is hitherto not available. Hence, two uncommon data sources were used to reconstruct the water level changes: (1) YouTube videos and (2) graffiti inscriptions. (1) The cave is frequently visited by locals and expats from Riyadh and many visitors are willing to share their cave adventures on YouTube. Identifying certain reference points in the uploaded videos (e.g. specific boulders, cave graffiti) and estimating their position relative to the water table allows for an approximate reconstruction of the recent groundwater rise. Information on the observation time is derived from the uploading date. Occasionally, also the exact date of the visit is provided as part of the footage description. (2) Some people documented their visit by graffiti inscriptions. These do not only serve as a marker in the videos, but also contain genuine data on historic water levels: if written on parts of the cave wall, which are only accessible from the water, they indicate the water level at the time of their creation. Fortunately, some graffiti also feature the date of the visit. In order to improve the reliability of the water level estimations, measurements conducted in the course of own site visits in the past few years were considered for the evaluation. Also photographs taken during these surveys helped to improve the quality of the water level reconstruction. The described "Youtube Approach" could be interpreted as a citizen science project with citizens being unaware of their participation. It illustrates the occasional need for creative solutions in data-scarce settings.

  18. HILIC separation of AETMA-labeled glycans on a wide bore silica-based monolithic capillary column

    Czech Academy of Sciences Publication Activity Database

    Šesták, Jozef; Křenková, Jana; Moravcová, Dana; Planeta, Josef; Kahle, Vladislav

    Brno : Ústav analytické chemie AV ČR, v. v. i, 2015 - (Foret, F.; Křenková, J.; Drobníková, I.; Klepárník, K.), s. 195-198 ISBN 978-80-904959-3-7. [CECE 2015. International Interdisciplinary Meeting on Bioanalysis /12./. Brno (CZ), 21.09.2015-23.09.2015] R&D Projects: GA MV VG20112015021; GA ČR(CZ) GA14-06319S Institutional support: RVO:68081715 Keywords : monolithic capillary column Subject RIV: CB - Analytical Chemistry, Separation http://www.ce-ce.org/CECE2015/CECE%202015%20proceedings_full.pdf

  19. Computation of In-bore Velocity-time and Travel-time profiles from Breech Pressure Measurements

    Directory of Open Access Journals (Sweden)

    D. K. Kankane

    2003-10-01

    Full Text Available The paper describes breech pressure measurement and also discusses the computation of velocity-time and travel-time profiles in the barrel from the instantaneous breech pressure values. The computed value of velocity at the shot out instant is obtained as the muzzle velocity. A close correlation is observed between the muzzle velocities measured by a radar and those computed from pressure-time data by this method.

  20. DRILL WEAR DURING THE BORING OF PARTICLE BOARD: A MULTI-FACTOR ANALYSIS INCLUDING EFFECTS OF MINERAL CONTAMINANTS

    Directory of Open Access Journals (Sweden)

    Boleslaw Porankiewicz

    2008-05-01

    Full Text Available This paper evaluates and discusses multifactor non-linear, statistical dependencies of drill side-edges recession VBK and drill diameter recession DW on the cutting path length LC, the content of hard mineral contaminants CMC, the size of contaminant particles SMC, and the Mohs hardness MH. Significant influence of the cutting path LC, the content CMC of hard mineral contaminants (HMC, and the size of contaminant particles SMC was found, whereas the Mohs hardness MH of the contamination particles was less important.

  1. ENVIRONMENTAL ASSESSMENT OF NOX CONTROL ON A SPARK-IGNITED LARGE BORE RECIPROCATING INTERNAL COMBUSTION ENGINE. VOLUME 1. TECHNICAL RESULTS

    Science.gov (United States)

    Volume I of the report gives emission results for a spark-ignited, largebore, reciprocating, internal-combustion engine operating both under baseline (normal) conditions, and with combustion modification controls to reduce NOx emissions to levels below the proposed new source per...

  2. Traveling Wave MRI at 21.1 T: Propagation below Cut-off for Ultrahigh Field Vertical Bore System

    CERN Document Server

    Tonyushkin, Alexey A; Grant, Samuel C; Kiruluta, Andrew JM

    2014-01-01

    At high magnetic field strengths (> 4 T), the propagation wave vector of the excitation field B1 can no longer be ignored as the wavelength becomes commensurate or smaller than the imaging field of view (FOV), particularly for high dielectric media. The emergence of this propagation wave vector renders the excitation field variant in both time and space. In this paper, the propagation of RF excitation waves in a high field vertical NMR system is demonstrated for the first time with an appropriate screened dielectric waveguide excited by a simple loop coil to enable below cutoff propagation for imaging in the far field. Uniquely, aqueous samples provide the high permittivity required to modify the cut-off requirements of this transmission system. Theory and simulations corroborate the observed propagating modes field patterns. The ease of construction and implementation of this setup permits use in a variety of high field systems. At a minimum, this design provides a larger FOV that is limited primarily by the...

  3. Lymeská borelióza - projev a výskyt u psů

    OpenAIRE

    Leová, Simona

    2013-01-01

    Lyme borreliosis affects all warm-blooded vertebrates, including humans. Its incidence is increasing not only in the Czech Republic but also in other countries, except Antarctica and South America. The greatest risk of infection are sites with high and dense vegetation, as well as broadleaved or mixed forests. Agent of of this disease is a bacteria of the genus Borrelia. The main reservoirs of this disease are rodents, deer, pets and tick, which is also the carrier. Some sources claim tick as...

  4. Internal bore welding of 2/one quarter/Cr-1 Mo steel tube-to-tubesheet joints

    International Nuclear Information System (INIS)

    The most critical weldments in the steam supply system for a liquid metal fast breeder reactor are those that join the steam generator tubes to the tube-sheets. A modified internal welding tip with a Ta 10% W collet as well as a fused quartz gas cup was used. The pressure differential between the inside and outside of tubular welds (determined with a water manometer) is critical in controlling weld bead geometry. 8 refs

  5. Quantitative discrimination between oil and water in drilled bore cores via fast-neutron resonance transmission radiography

    CERN Document Server

    Vartsky, D; Dangendorf, V; Israelashvili, I; Mor, I; Bar, D; Tittelmeier, K; Weierganz, M; Breskin, A

    2016-01-01

    A novel method based on Fast Neutron Resonance Transmission Radiography is proposed for non-destructive, quantitative determination of the weight percentages of oil and water in cores taken from subterranean or underwater geological formations. The ability of the method to distinguish water from oil stems from the unambiguously-specific energy dependence of the neutron cross-sections for the principal elemental constituents. Monte-Carlo simulations and initial results of experimental investigations indicate that the technique may provide a rapid, accurate and non-destructive method for quantitative evaluation of core fluids in thick intact cores, including those of tight shales for which the use of conventional core analytical approaches appears to be questionable.

  6. Not so flat and boring after all: how the Kansas Senate race became 2014’s most improbable tossup

    OpenAIRE

    Miller, Patrick

    2014-01-01

    Before this summer, few commentators would have thought that the state of Kansas would move from a safe Republican seat to a tossup race that may have implications for the control of the Senate. Patrick Miller looks at the state of the race between the three term time incumbent Pat Roberts and his Independent challenger, Greg Orman. He writes that a combination of poor campaigning, residency questions, and the withdrawal of the Democratic candidate from the ballot have come together to provid...

  7. Pornographie ist langweilig! Die „Lustmaschinen“ der Philosophie Pornography is Boring! Philosophical “Machines of Desire”

    Directory of Open Access Journals (Sweden)

    Pascal Eitler

    2007-11-01

    Full Text Available Die vorliegende Studie bietet eine überaus ambitionierte philosophische Erörterung der Problematik des modernen Subjekts und seiner Beziehung zur Pornographie. Svenja Flaßpöhler widmet sich in diesem Zusammenhang insbesondere dem Werk des Marquis de Sade und setzt dieses in Beziehung zur aufgeklärten Selbstreflexion einerseits und zum Pornofilm der Gegenwart anderseits.The study at hand is a very ambitious philosophical exposition on the modern subject in relation to pornography. It approaches specifically the work of the Marquis de Sade and places it in relation to enlightened reflections on the self and to contemporary porno films.

  8. Pornographie ist langweilig! Die „Lustmaschinen“ der Philosophie Pornography is Boring! Philosophical “Machines of Desire”

    OpenAIRE

    Pascal Eitler

    2007-01-01

    Die vorliegende Studie bietet eine überaus ambitionierte philosophische Erörterung der Problematik des modernen Subjekts und seiner Beziehung zur Pornographie. Svenja Flaßpöhler widmet sich in diesem Zusammenhang insbesondere dem Werk des Marquis de Sade und setzt dieses in Beziehung zur aufgeklärten Selbstreflexion einerseits und zum Pornofilm der Gegenwart anderseits.The study at hand is a very ambitious philosophical exposition on the modern subject in relation to pornography. It approache...

  9. Temporal and spectral features of sounds of wood-boring beetle larvae: identifiable patterns of activity enable improved discrimination from background noise

    Science.gov (United States)

    Rhynchophorus weevil larvae produce economically important damage to ornamental and date palm crops that could be mitigated significantly by early detection and treatment. Acoustic technology has potential to enable early detection, but often it is difficult to distinguish insect sounds from backgr...

  10. Site study plan for Exploratory shaft facilities design foundation boreholes (shaft surface facility foundation borings), Deaf Smith County Site, Texas: Surface-based geotechnical field program: Preliminary draft

    Energy Technology Data Exchange (ETDEWEB)

    1987-12-01

    This site study plan describes the Exploratory Shaft Facilities (ESF) Design Foundation Boreholes field activities to be conducted during early stages of Site Characterization at the Deaf Smith County, Texas, site. The field program has been designed to provide data useful in addressing information/data needs resulting from federal/state/local regulations, and repository program requirements. Approximately 50 foundation boreholes will be drilled within the ESP location to provide data necessary for design of the ESF and to satisfy applicable shaft permitting requirements. Soils and subsurface rock will be sampled as the foundation boreholes are advanced. Soil samples or rock core will be taken through the Blackwater Draw and Ogallala Formations and the Dockum Group. Hydrologic testing will be performed in boreholes that penetrates the water table. In-situ elastic properties will be determined from both the soil strata and rock units along the length of the boreholes. Field methods/tests are chosen that provide the best or only means of obtaining the required data. The Salt Repository Project (SRP) Networks specify the schedule under which the program will operate. Drilling will not begin until after site ground water baseline conditions have been established. The Technical Field Services Contractor is responsible for conducting the field program of drilling and testing. Samples and data will be handled and reported in accordance with established SRP procedures. A quality assurance program will be utilized to assure that activities affecting quality are performed correctly and that the appropriate documentation is maintained. 25 refs., 10 figs., 6 tabs.

  11. Comparison of stress state around the Atera fault, central Japan, estimated using boring core samples and by improved hydraulic fracture tests

    Science.gov (United States)

    Yabe, Yasuo; Yamamoto, Kiyohiko; Sato, Namiko; Omura, Kentaro

    2010-03-01

    An often disputed subject is whether the stress memory of rocks can be reproduced by deformation rate analysis (DRA). Doubt has also been expressed on whether a rock can memorize its stress history. We compared the stress state around the Atera fault system, central Japan, using the hydraulic fracture test (HFT) and DRA at the same boreholes. The quality of the HFT results at these holes, especially that of the magnitude of maximum horizontal compression ( S H max), was recently improved by considering the tensile strength of the borehole wall. The S Hmax azimuth determined by the DRA was about N-S. Although this is inconsistent with the geological presumption, it agrees well with the S Hmax azimuth estimated by the HFT and the drilling-induced tensile fracture (DITF). The magnitudes of horizontal principal stresses obtained by DRA were generally consistent with the improved HFT results, and the consistency between stress states estimated by the DRA and the HFT indicates the existence of stress memory. Based on our results, we conclude that the DRA can be one option for measuring the stress state of the earth's crust.

  12. Boring of hot spring. Kussaku koji deno mondaiten/ryuiten; Onsen boringu ni tsuite. Problems and consideration in well drilling work

    Energy Technology Data Exchange (ETDEWEB)

    Higuchi, K. [The Society of Engineers for Mineral Springs, Tokyo (Japan)

    1997-03-31

    Problems and consideration in well drilling from the application to the completion of the well are discussed from the viewpoint of hot spring drilling industry. In the case of developing a hot spring, it is required to make an application for drilling and get permission based on the hot spring law. Inquiries must be made for `other laws` to obtain necessary permission and a written consent. Subjects which should be considered regarding the core, drilling depth, and diameter of the well are introduced. The drilling depths from 1,000m to 1,500m become common recently, and wells with more than 2,000m depths are drilled sometimes. The technology for hot spring drilling is also an important factor. Documents desirable to be attached to the contract for preventing future troubles beforehand are indicated. Among the important works during the work period, confirmation whether the work has been carried on in accordance with the documents for design and plan is necessary. Problems and consideration during finishing and hot spring water pumping tests are discussed. 5 figs., 6 tabs.

  13. Dynamic Contrast-Enhanced MRI Parameters as Biomarkers in Assessing Head and Neck Lesions After Chemoradiotherapy Using a Wide-Bore 3 Tesla Scanner.

    Science.gov (United States)

    Lerant, Gergely; Sarkozy, Peter; Takacsi-Nagy, Zoltan; Polony, Gabor; Tamas, Laszlo; Toth, Erika; Boer, Andras; Javor, Laszlo; Godeny, Maria

    2015-09-01

    Pilot studies have shown promising results in characterizing head and neck tumors (HNT) using dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI), differentiating between malignant and benign lesions and evaluating changes in response to chemoradiotherapy (CRT). Our aim was to find DCE-MRI parameters, biomarkers in evaluating the post-CRT status. Two hundred and five patients with head and neck lesions were examined with DCE-MRI sequences. The time intensity curves (TIC) were extracted and processed to acquire time-to-peak (TTP), relative maximum enhancement (RME), relative wash-out (RWO), and two new parameters attack and decay. These parameters were analyzed using univariate tests in SPSS (Statistical Package for the Social Sciences, version 17, SPSS Inc. Chicago, USA) to identify parameters that could be used to infer tumor malignancy and post-CRT changes. Multiple parameters of curve characteristics were significantly different between malignant tumors after CRT (MACRT) and changes caused by CRT. The best-performing biomarkers were the attack and the decay. We also found multiple significant (p < 0.05) parameters for both the benign and malignant status as well as pre- and post-CRT status. Our large cohort of data supports the increasing role of DCE-MRI in HNT differentiation, particularly for the assessment of post-CRT status along with accurate morphological imaging. PMID:25920367

  14. Is IPE just 'boring',1 or committed to problematic meta-theoretic|al assumptions? A critical engagement with the politics of method

    Directory of Open Access Journals (Sweden)

    Heloise Weber

    2015-12-01

    Full Text Available Abstract In my contribution to this forum on IPE, my aim is to add further to the critical interventions in the debate ignited by Benjamin Cohen. The call to discuss the state of IPE has been timely, though not only because (some IPE journals have indeed become uninteresting; much more is at stake. Intellectual debate in the field has now not only narrowed, but has also shifted away from engaging the underlying premises of (global development, inequalities, and relations of domination. As such, the mainstream framing of IPE is arguably also implicated in a project of 'gate-keeping'. This is not to say that the intellectual richness and creativity that Cohen has called for in the study of IPE does not exist; such work is pursued by scholars of IR, more broadly conceived, and not just by those in other disciplines. Such richer scholarship has for instance, been advanced by historical sociologists, postcolonial theorists, and critical scholars of global development/global political economy including many working from feminist political-economic perspectives. The absence of an engagement with such perspectives in the mainstream of IPE can perhaps be explained to some extent by reference to ideological dispositions and attempts to maintain a hold on the disciplinary core along epistemological and methodological premises committed to ostensibly power-free and value-free analysis. The consequences are felt, as Cohen notes, also in the context of training and preparing future generations of IPE scholars, where current practices tend to reproduce students unable to 'ask and respond to the big questions', and who have instead come to be satisfied with applying 'accepted' methods. Critical scholars, on the other hand, have continuously pushed beyond the analytical and theoretical boundaries, engaging for example, with questions of power, domination and resistance, and more often than not such analyses are grounded in empirical research. In this contribution, I aim to demonstrate, through a critical reconstructive sketch, how mainstream IPE falls short, and what the value is of alternative, relationally conceived, analytical approaches.

  15. Proof-of-feasibility of using well bore deformation as a diagnostic tool to improve CO2 sequestration

    Energy Technology Data Exchange (ETDEWEB)

    Murdoch, Larry [Clemson Univ., SC (United States); Moysey, Stephen [Clemson Univ., SC (United States); Germanovich, Leonid [Georgia Inst. of Technology, Atlanta, GA (United States); Hughes, Baker [Clemson Univ., SC (United States)

    2016-01-13

    Injecting CO2 raises pore pressure and this causes subsurface formations to deform. The pattern and amount of deformation will reflect the distribution of pressure and formation properties in the subsurface, two quantities of interest during CO2 storage. The hypothesis underlying this research is that the small deformation accompanying CO2 storage can be measured and interpreted to improve the storage process.

  16. Automated analyser for monitoring the contents of hydrocarbons in gas emitted from exploratory bore-holes in the gas and oil industry

    OpenAIRE

    Jacek Namieśnik; Wojciech Chrzanowski; Paweł Żwan; Wacław Janicki

    2003-01-01

    An automated analyser for total hydrocarbon contents and hydrocarbon composition (from methane to pentanes) was constructed and tested in both laboratory and field exploitation. It used two-channel analysis: continuous measurements of total hydrocarbon contents and periodic (90 or 150 s) composition analysis after separation of hydrocarbons on a gas chromatographic column. Flame ionization detectors were used in both channels. A simple 16-bit analogue-to-digital converter was used (4.8, pract...

  17. Well bore Flow Treatment Used to Predict Radioactive Brine Releases to the Surface from Future Drilling Penetrations into the Waste Isolation Pilot Plant (WIPP), New Mexico, USA

    International Nuclear Information System (INIS)

    The Waste Isolation Pilot Plant (WIPP) is the U.S. Department of Energy's (DOE) mined geologic repository in southeastern New Mexico, USA.This site is designed for the permanent burial of transuranic radioactive waste generated by defense related activities.The waste produces gases when exposed to brine. This gas generation may result in increased pressures over time. Therefore, a future driller that unknowingly penetrates through the site may experience a blowout. This paper describes the methodology used to predict the resultant volumes of contaminated brine released

  18. Analysis of populations of boring and fouling organisms in the vicinity of Oyster Creek Nuclear Generating Station. Annual progress report, September 1, 1977--August 31, 1978

    International Nuclear Information System (INIS)

    The growth, distribution, and species composition of marine borers (primarily shipworms) and fouling organisms were studied in the vicinity of the Oyster Creek Nuclear Generating Station. This report presents data on the relationship between the Generating Station and sedentary marine organisms, especially shipworms. A review and interpretation of the data for the period May 27, 1977--August 31, 1978, in the context of results since 1971 are given. A shipworm outbreak has again occurred in Oyster Creek. The overwhelmingly dominant species is Teredo bartschi, but a few T. navalis, B. gouldi, and T. furcifera were also found. The first sign of an outbreak of T. bartschi came in early spring, 1978, but by August, panels in Oyster Creek were riddled. The 1978 outbreak differs from the one that occurred soon after the Generating Station began operation, in that the earlier outbreak consisted of the endemic species Bankia gouldi and Teredo navalis. Dominant species of fouling organisms change on a monthly basis, but repeat on a seasonal basis. Some fouling organisms such as Limnoria may interfere with shipworm settlement

  19. Analysis of populations of boring and fouling organisms in the vicinity of Oyster Creek Nuclear Generating Station. Annual progress report, September 1, 1977--August 31, 1978

    Energy Technology Data Exchange (ETDEWEB)

    Hoagland, K.E.; Crocket, L.

    1978-12-01

    The growth, distribution, and species composition of marine borers (primarily shipworms) and fouling organisms were studied in the vicinity of the Oyster Creek Nuclear Generating Station. This report presents data on the relationship between the Generating Station and sedentary marine organisms, especially shipworms. A review and interpretation of the data for the period May 27, 1977--August 31, 1978, in the context of results since 1971 are given. A shipworm outbreak has again occurred in Oyster Creek. The overwhelmingly dominant species is Teredo bartschi, but a few T. navalis, B. gouldi, and T. furcifera were also found. The first sign of an outbreak of T. bartschi came in early spring, 1978, but by August, panels in Oyster Creek were riddled. The 1978 outbreak differs from the one that occurred soon after the Generating Station began operation, in that the earlier outbreak consisted of the endemic species Bankia gouldi and Teredo navalis. Dominant species of fouling organisms change on a monthly basis, but repeat on a seasonal basis. Some fouling organisms such as Limnoria may interfere with shipworm settlement.

  20. Review of SKB's ZEDEX Report - A study of the zone of excavation disturbance for blasted and bored tunnels - SKB ICR 96-03, Vol. 1-3

    International Nuclear Information System (INIS)

    We have reviewed and evaluated the contents of the ZEDEX report. The review has been focussed on investigation methods, results and interpretations. The conclusions of the review are that the ZEDEX was successful in some aspects. However, the study has not met with the objective of understanding the excavation disturbed zone (EDZ). A lot of questions remain to be answered as regards the origin, character and extent of the EDZ. Investigation of the hydraulic properties of the EDZ was not included as a major aim in the ZEDEX study and only some supporting studies were conducted. We find it regrettable that priority was not given to these aspects, since improved knowledge in this field is considered important with respect to the performance and safety of the repository. The review has identified a number of shortages in the expected outcome and objectives set up for the ZEDEX experiment that more or less have influenced the results of the study. Several problems of interpretation were introduced directly as a result of the unsatisfactory performance of the drill and blast drift. It would have been valuable if cautious blasting had been applied. A number of recommendations for future studies are made

  1. Progress and gaps in understanding mechanisms of ash tree resistance to emerald ash borer, a model for wood-boring insects that kill angiosperms.

    Science.gov (United States)

    Villari, Caterina; Herms, Daniel A; Whitehill, Justin G A; Cipollini, Don; Bonello, Pierluigi

    2016-01-01

    We review the literature on host resistance of ash to emerald ash borer (EAB, Agrilus planipennis), an invasive species that causes widespread mortality of ash. Manchurian ash (Fraxinus mandshurica), which coevolved with EAB, is more resistant than evolutionarily naïve North American and European congeners. Manchurian ash was less preferred for adult feeding and oviposition than susceptible hosts, more resistant to larval feeding, had higher constitutive concentrations of bark lignans, coumarins, proline, tyramine and defensive proteins, and was characterized by faster oxidation of phenolics. Consistent with EAB being a secondary colonizer of coevolved hosts, drought stress decreased the resistance of Manchurian ash, but had no effect on constitutive bark phenolics, suggesting that they do not contribute to increased susceptibility in response to drought stress. The induced resistance of North American species to EAB in response to the exogenous application of methyl jasmonate was associated with increased bark concentrations of verbascoside, lignin and/or trypsin inhibitors, which decreased larval survival and/or growth in bioassays. This finding suggests that these inherently susceptible species possess latent defenses that are not induced naturally by larval colonization, perhaps because they fail to recognize larval cues or respond quickly enough. Finally, we propose future research directions that would address some critical knowledge gaps. PMID:26268949

  2. Study of boron carbide evolution under neutron irradiation; Contribution a l'etude de l'evolution du carbure de bore sous irradiation neutronique

    Energy Technology Data Exchange (ETDEWEB)

    Simeone, D. [CEA/Saclay, Dept. de Mecanique et de Technologie (DMT), 91 - Gif-sur-Yvette (France)]|[Universite Blaise Pascal, Clermont-Ferrand II, (CNRS), 63 - Aubiere (France)

    1999-07-01

    Owing to its high neutron efficiency, boron carbide (B{sub 4}C) is used as a neutron absorber in control rods of nuclear plants. Its behaviour under irradiation has been extensively studied for many years. It now seems clear that brittleness of the material induced by the {sup 10}B(n,{alpha}){sup 7}Li capture reaction is due to penny shaped helium bubbles associated to a high strain field around them. However, no model explains the behaviour of the material under neutron irradiation. In order to build such a model, this work uses different techniques: nuclear microprobe X-ray diffraction profile analysis and Raman and Nuclear Magnetic Resonance Spectroscopy to present an evolution model of B{sub 4}C under neutron irradiation. The use of nuclear reactions produced by a nuclear microprobe such as the {sup 7}Li(p,p'{gamma}){sup 7}Li reaction, allows to measure lithium profile in B{sub 4}C pellets irradiated either in Pressurised Water Reactors or in Fast Breeder Reactors. Examining such profiles enables us to describe the migration of lithium atoms out of B{sub 4}C materials under neutron irradiation. The analysis of X-ray diffraction profiles of irradiated B{sub 4}C samples allows us to quantify the concentrations of helium bubbles as well as the strain fields around such bubbles.Furthermore Raman spectroscopy studies of different B{sub 4}C samples lead us to propose that under neutron irradiation. the CBC linear chain disappears. Such a vanishing of this CBC chain. validated by NMR analysis, may explain the penny shaped of helium bubbles inside irradiated B{sub 4}C. (author)

  3. Site study plan for Exploratory shaft facilities design foundation boreholes (shaft surface facility foundation borings), Deaf Smith County Site, Texas: Surface-based geotechnical field program: Preliminary draft

    International Nuclear Information System (INIS)

    This site study plan describes the Exploratory Shaft Facilities (ESF) Design Foundation Boreholes field activities to be conducted during early stages of Site Characterization at the Deaf Smith County, Texas, site. The field program has been designed to provide data useful in addressing information/data needs resulting from federal/state/local regulations, and repository program requirements. Approximately 50 foundation boreholes will be drilled within the ESP location to provide data necessary for design of the ESF and to satisfy applicable shaft permitting requirements. Soils and subsurface rock will be sampled as the foundation boreholes are advanced. Soil samples or rock core will be taken through the Blackwater Draw and Ogallala Formations and the Dockum Group. Hydrologic testing will be performed in boreholes that penetrates the water table. In-situ elastic properties will be determined from both the soil strata and rock units along the length of the boreholes. Field methods/tests are chosen that provide the best or only means of obtaining the required data. The Salt Repository Project (SRP) Networks specify the schedule under which the program will operate. Drilling will not begin until after site ground water baseline conditions have been established. The Technical Field Services Contractor is responsible for conducting the field program of drilling and testing. Samples and data will be handled and reported in accordance with established SRP procedures. A quality assurance program will be utilized to assure that activities affecting quality are performed correctly and that the appropriate documentation is maintained. 25 refs., 10 figs., 6 tabs

  4. Elaboration and characterisation of SiAlON-boron nitride refractory ceramic composites; Elaboration et caracterisation de composites ceramiques refractaires SiALON-Nitrure de bore

    Energy Technology Data Exchange (ETDEWEB)

    Doche, C.

    1996-05-07

    SiAlON-BN are materials able to replace carbon refractories used in steel-making shop, especially for low carbon steels elaboration. Two family of composites are studied: Si{sub 3}N{sub 4}-BN obtained by hot compression, and SiAlON-BN by natural sintering. In the first case, an organic precursor of BN which seems to activate the sintering process was also used. For all these materials, we studied elaboration processes, microstructures, mechanical properties, and thermal shocks, oxidation and corrosion resistances by liquid iron. BN presence lowers mechanical properties, but increases thermal shock and oxidation resistance at high temperature. From all the sintering add-on, Y{sub 2}O{sub 3}, Nd{sub 2}O{sub 3}, La{sub 2}O{sub 3}, CeO{sub 2}, neodymium and lanthanum oxides seems to give a light improvement of high temperature resistance. (A.B.)

  5. Over-all Drying-rate Equations on the Drying of Potato by the Microwave Energy and of Bored One by Heated Flowing Air

    OpenAIRE

    Kubota, Kiyoshi; Araki, Hideki; Nagai, Mitsuo; Kintou, Hiroaki; Suzuki, Kanichi; Esaka, Muneharu

    1983-01-01

    各種食品の各種乾燥装置を設計するためには、各種乾燥における乾燥速度式を設定しておくことが必要となる。前報1~3)において、熱風乾燥における食品の総括乾燥速度式の設定に関する研究を根菜類食品を例として行なってきた。食品乾燥工程における熱効率向上を進めることを目的として、試料の前処理方法とか加熱方法とかを検討していくことは、熱エネルギー資源を有効利用し、食糧資源を保存利用していくのに役立つ研究と考えられる。本報では、ジャガイモを例とし、マイクロ波利用と試料に穴あけする方法で乾燥速度を増大させる試みをする実験を行ない、それぞれに対し総括乾燥速度式の設定を行なった。マイクロ波利用の乾燥は、試料の褐変化などのために低乾燥域の実験しか行なうことができなかった。また、熱風乾燥において、試料に穴あけする方法による熱効率向上の試みに対しては、本実験条件下では期待した結果が得られないことがわかった。本研究成果を参考とし、マイクロ波利用における均一化加熱の検討を進めるなどし、マイクロ波加熱による組織破壊の前処理試料を作製し、それを熱風乾燥していく研究を進めていくことによって、熱効率向上ができる結果が得...

  6. A conduction-cooled, 680-mm-long warm bore, 3-T Nb3Sn solenoid for a Cerenkov free electron laser

    OpenAIRE

    Wessel, W.A.J.; Ouden, den, W.; Krooshoop, H.J.G.; Kate, ten, Herman H.J.; Wieland, J; Slot, van der, J.

    1999-01-01

    A compact, cryocooler cooled Nb3Sn superconducting magnet system for a Cerenkov free electron laser has been designed, fabricated and tested. The magnet is positioned directly behind the electron gun of the laser system. The solenoidal field compresses and guides a tube-shaped 100 A, 500 kV electron beam. A two-stage GM cryocooler, equipped with a first generation ErNi5 regenerator, cools the epoxy impregnated solenoid down to the operating temperature of about 7.5 K. This leaves a conservati...

  7. Ultrasonic Detection on Welded Joint of Small-bore Thin Wall Tube%薄壁小径管焊接接头超声波探伤

    Institute of Scientific and Technical Information of China (English)

    涂葵

    2013-01-01

    为进一步提高薄壁小口径管焊缝的超声波检验准确度,以《管道焊接接头超声波检验技术规程》(DL/T820-2002)标准为检验依据,介绍了薄壁小径管焊缝超声波探伤的常规方法,重点探讨了常规探伤方法在实际探伤中缺陷定位方面遇到的一些问题,提出了解决问题的方案.

  8. Mechanical and thermal analyses of transfer casks and bore hole lock for final storage of spent fuel rod in BSK-3; Mechanische und thermische Analysen von Transferbehaelter und Bohrlochschleuse zur Endlagerung abgebrannter Brennstaebe in BSK 3

    Energy Technology Data Exchange (ETDEWEB)

    Fopp, S.; Graf, R. [GNS Gesellschaft fuer Nuklear-Service mbH, Essen (Germany); Filbert, W. [DBE Technology GmbH, Peine (Germany)

    2008-07-01

    In the frame of ESDRED (engineering studies and demonstration of repository designs) DBE Technology and GNS enhance the concept of final storage of spent fuel rods in un-shielded canisters (BSK 3) in boreholes of salt formations. The transfer container (TSB) is envisaged as radiological shielding for the transport of BSK 3 within the facility. The authors describe the construction of TFB including the lock at the top and bottom ends of the container and the lock on top of the borehole. The mechanical design of the TFB is performed using the FEM program ANSYS, the compliance with allowed stress limits is demonstrated. The temperature field in the TFB is calculated using ANSYS, the maximum temperatures are 74-76 C at the TFB wall and the lock, respectively.

  9. 某超高射速舰炮弹药筒膛内横断问题技术分析%Technical Analysis of Cartridge Breaking in Bore for Super-high Firing Rate Naval Gun

    Institute of Scientific and Technical Information of China (English)

    马献怀

    2015-01-01

    针对某超高射速舰炮及其弹道炮试验过程中出现的药筒膛内横断问题,通过现场勘测、理论分析和故障还原试验,确定了故障原因。根据故障机理,经技术攻关,提出了解决措施,经过后续多次射击试验验证,故障再未复现,证明了解决措施的可行有效。分析结果对解决速射火炮类似故障有重要的参考价值。%Aimed at the cartridge breaking problem occurred during the test of super-high firing rate naval gun and ballistic gun,the failure causes were determined by site investigation,theo-retical analysis and failure reproduction test.The solution was proposed based on the failure mechanism and technology research.The same failure hasn't occurred again during many firing test.The results show the solution is reasonable and feasible,which provides an important ref-erence value for solving similar failure of rapid-fire gun.

  10. 由炮膛磨损规律确定火炮初速减退量的方法%A Method for Determining the Decrement of Muzzle Velocity of Gun Base on the Law of Bore Wearing

    Institute of Scientific and Technical Information of China (English)

    闵建平; 谭俊杰; 王桂玉

    2002-01-01

    根据炮膛磨损规律讨论了确定火炮初速减退量的方法,建立了火炮初速减退量与炮膛磨损规律关系的数学模型,利用该模型求出火炮的不同磨损曲线及每一条曲线所对应的初速减退量、曲线上各段的权重系数,用检测仪测出炮膛的磨损曲线后,即确定出火炮的初速减退量.

  11. 适用于浅海小口径复合软管的接头形式研究%Research for End Fitting of Small-bore Composite Flexible Pipes in Shallow Water

    Institute of Scientific and Technical Information of China (English)

    唐建华; 王琳; 曲杰

    2012-01-01

    Design a type of the flexible pipe end fitting, which can have enough strength and leak tightness under certain pressure and can release the accumulated gas in the armor layers, and this type of end fitting have successfully achieved the connection and protection request of the flexible pipes. A major advantage of using the flexible pipes is their ability to work under extreme dynamic conditions and their relatively seabed adaptability and chemical compatibility properties and installation convenience compared with rigid carbon steel pipes.%设计了一种适用于软管结构的接头形式,在一定压力作用下保证软管的强度和密封性,同时能够释放金属铠装层中累积的渗透气体,成功实现复合软管的连接和保护.因其在动力特性、地形适应性、抗腐蚀性、安装等多方面的优势,越来越多的油田开发考虑采用软管采代替钢管,具有很大的发展前景.

  12. Boring and excavation technologies for Opalinus clay in the rock laboratories at Mont Terri; Techniques de forages et d'excavations dans les argiles à Opalinus, laboratoire souterrain du Mont Terri

    Energy Technology Data Exchange (ETDEWEB)

    Bossart, P.; Nussbaum, Ch. [Swiss Federal Office of Topography swisstopo, Wabern (Switzerland); Burrus, F. [Groupe Grands Travaux GGT, Porrentruy (Switzerland)

    2012-07-01

    This comprehensive article discusses the work done since 1996 at the rock laboratories at Mont Terri in the Swiss Jura Mountains. The work being done by fifteen international partners on the characterisation of the Opalinus clay with regard to its geological, hydro-geological, geochemical and geotechnical characteristics is reported on. Various methods of drilling are described that are able to preserve any tectonic crevices in the rock. Drilling under special conditions, including the use of nitrogen and argon atmospheres to prevent bacterial contamination, is looked at, as are the methods used in tunnelling without having to use water.

  13. Technical Analysis of Cartridge Breaking in Bore for Super-high Firing Rate Naval Gun%某超高射速舰炮弹药筒膛内横断问题技术分析

    Institute of Scientific and Technical Information of China (English)

    马献怀

    2015-01-01

    针对某超高射速舰炮及其弹道炮试验过程中出现的药筒膛内横断问题,通过现场勘测、理论分析和故障还原试验,确定了故障原因。根据故障机理,经技术攻关,提出了解决措施,经过后续多次射击试验验证,故障再未复现,证明了解决措施的可行有效。分析结果对解决速射火炮类似故障有重要的参考价值。%Aimed at the cartridge breaking problem occurred during the test of super-high firing rate naval gun and ballistic gun,the failure causes were determined by site investigation,theo-retical analysis and failure reproduction test.The solution was proposed based on the failure mechanism and technology research.The same failure hasn't occurred again during many firing test.The results show the solution is reasonable and feasible,which provides an important ref-erence value for solving similar failure of rapid-fire gun.

  14. 钻孔桩与D型钢便梁在营业线施工中的应用%Bored Piles D Steel Beam in the Construction Business Line

    Institute of Scientific and Technical Information of China (English)

    李正宇

    2012-01-01

    太原铁路枢纽新建西南环线工程的北格站旅客地道下穿既有太中银铁路,在不能中断太中银铁路行车的情况下,提出了将钻孔桩与D型钢便梁进行有效结合的方法,顺利完成了营业线路下方的旅客地道施工.解决了施工中如何最大限度地减小对太中银铁路行车干扰的问题,达到了降低施工风险和难度,确保行车和施工安全的效果.

  15. Logging as a means of characterising the water in rock formations in groundwater collection borings; Utilizacion de diagrafias para la caracterizacion del agua de la formaciones en sondeos de captacion de aguas subterranea

    Energy Technology Data Exchange (ETDEWEB)

    Diaz Curiel, J.M.; Miguel, M.J.; Dominguez, S.; Caparrini, N

    1998-12-01

    We present an improvement of the S.P. application to obtain water conductivity and total of dissolved solids in the permeable layers passed through open hole, supposing said levels completely water saturated (under phreatic level). The optimization consists of a methodology for the treatment and interpretation of S.P. logs as well as the development of computer codes to execute the following processes. Laboratory measurements to acquire a set of key values in the interpretation processes (R{sub w}e/R{sub w} and TDS/R{sub w}). Conversion of the obtained data and selected charts, with continuous application range, to analytical curves for their automatic procedure. Algorithms development in order to carry out the automatic determination of base line and the elimination of its displacements. This system have been applied over a set of 27 logs performed by the author in the south area of the Duero basin (Spain) as an example of multi-layered detrital. We show the conductivity and TDS results in comparison with the water analysis obtained through pumping. (Author) 30 refs.

  16. Study of boron effect on FeAl alloys with an ordered B2 structure; Etude de l'effet du bore sur les alliages FeAl ordonnes de structure B2

    Energy Technology Data Exchange (ETDEWEB)

    Gay-Brun, A.S

    1998-06-01

    FeAl alloys with an ordered B2 structure have good corrosion resistance and mechanical properties at high temperature. Nevertheless, their use is limited by the intergranular embrittlement at ambient temperature. It has already been shown that a doping by low amounts of boron can solve the problem of intergranular embrittlement. The aim of this work is to better understand the boron effect on the FeAl alloys. It has been confirmed that the boron doping change the mode of rupture of the FeAl alloys with a B2 structure; their strain on breaking point is increased. The limit of solubility of boron in Fe-40Al has been estimated between 400 and 800 ppm at 500 degrees Celsius. Above this limit, Fe{sub 2}B precipitates. The intergranular segregation of boron has been observed by Auger electron spectroscopy for all the FeAl alloys. The intergranular amount of boron is low (below 12%). In the range of boron solubility, the intergranular concentration of boron increases with its voluminal amount. From this result, boron segregation has been described by different models of equilibrium segregation; thus has been shown that it exists a strong repulsion energy between the segregated boron atoms. On the other hand, no equilibrium segregation model can describe the independence to temperature of the boron segregation and its very fast kinetics: these two characteristics have certainly to be explained by a segregation mechanism under equilibrium. The existence of a segregation mechanism under equilibrium has been confirmed by the observation of the acceleration of the vacancies elimination kinetics by boron. The interaction between the boron atoms and the thermal vacancies which migrates to grain boundaries lead to the formation of complexes. The importance of the boron effect is not limited to its role to grain boundaries. Indeed, has been observed a strong decrease of the long order distance in the alloys doped with boron. The structure of the dislocations created by the vacancies elimination shows too that boron induces a modification of the mechanism of vacancies elimination. (O.M.)

  17. Improvement of 1P65F Petrol Engine Cylinder Block Boring and Rolling Process%1P65F汽油机缸体孔镗缸滚压工艺改进

    Institute of Scientific and Technical Information of China (English)

    蔡浚琴

    2014-01-01

    The machining process of 1P65F petrol engine cylinder holes of four-stroke vertical axes for lawn machines is studies,with the result after machining analyzed,summarized and with the based machining scheme proposed based on the actual production situation.%研究草坪机用四冲程垂直轴1P65F汽油机缸体孔的加工过程,对加工后的结果进行分析、总结,并结合生产实际制订出最佳加工方案。

  18. 车、镗类刀具主副偏角的选择技巧%Selecting Method of Main and Auxiliary Deflected Angles of Turning and Boring Cutter

    Institute of Scientific and Technical Information of China (English)

    王永

    2007-01-01

    选择刀片时,刀片的前角、后角首先要与工件材料及刀具材料相匹配,如果机床配备的是小功率主轴电机或者被加工件是刚性不足件,例如车削6D≤L≤12D的细长杆,刀片除了要采用正确的前、后角之外,我们还要关注刀片的主、副偏角选用是否合理。主偏角过大会降低刀具的耐用度,过小会使工件变形并产生振动,甚至刀具会“挤”在工件上致使工件无法旋转产生“闷刀现象”。

  19. 大直径深层钻孔灌注桩拔除工艺研究%Research on Pulling-out Technology for Long Bored Pile with Large Diameter

    Institute of Scientific and Technical Information of China (English)

    裴迅; 芮大虎; 吴庆红; 葛执礼

    2015-01-01

    According to the characteristics of long and large diameter pile to be pulled out in the open-excavated tunnel ( pile-puling interval) in Zhengzhou, the force on pile body and the pile-pulling technology are studied.Through the analy-sis and calculation on failure mode of soil around the pile and tensile strength of the pile body in pulling-out process, the ef-fective method of resistance reduction is selected to be applied in the engineering practice, and good results are achieved. The solutions of pile body partial enlarged, too large pile lateral friction and pile broken in pile pulling-out operation are summed up, which can serve as reference for the same projects.%结合郑州南站连接线明挖隧道(拔桩区间)拟拔桩基直径大、桩长的特点,对桩体受力特征和拔桩工艺进行了研究。通过拔桩过程中桩周土破坏模式和桩体自身的抗拉强度分析计算,选取有效的减阻方法并应用于工程实践,取得良好效果。最后总结出大直径深层钻孔灌注桩拔除工程中桩身局部扩大、桩侧摩阻力过大和断桩等问题及相应的解决方法,供今后类似工程借鉴。

  20. Application of rotary drilling rig bored pile technology in LongQing expressway%旋挖钻机成孔灌注桩技术在龙青高速公路中的应用

    Institute of Scientific and Technical Information of China (English)

    吴昊

    2014-01-01

    旋挖钻成孔核心技术为通过旋挖钻底部带有活门的桶式钻头,利用钻杆的扭矩力将钻头压入土体回转破碎岩土,并将其装入钻头内,提出孔外卸土,往复循环达到成孔目的。%The core technology of rotary drilling is using drill pipe rotary torque force to press the barrel drill which is located on the bottom of the rotary drilling and with a valve into the rock and soil , and then rotate the drilling to break the rock and soil , make the barrel full with fragments ,then pull the drill out to pour them out , repeat several times until the hole forming .