Results for 'Nuclear magnetic resonance'

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  1.  8
    Nuclear Magnetic Resonance Secular Relaxation Measurements as a Method of Extracting Internal Magnetic Field Gradients and Pore Sizes.Andrew Johnson & Hugh Daigle - 2016 - Interpretation: SEG 4 (4):T557-T565.
    Nuclear magnetic resonance has been used as a common and powerful tool for petrophysical investigation of fluid-bearing porous media. A major complication of NMR analysis occurs, however, when diffusion of fluid protons through magnetic field heterogeneities becomes nonnegligible. A quantity called the secular relaxation rate has been defined as the difference in transverse and longitudinal relaxation rates and can be shown to isolate the effects of diffusion as a function of pore system parameters. We have developed (...)
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  2.  5
    Nuclear Magnetic Resonance, Stored Energy, and the Density of Dislocations in Deformed Aluminium.E. A. Faulkner & R. K. Ham - 1962 - Philosophical Magazine 7 (74):279-284.
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  3.  5
    Nuclear Magnetic Resonance in Silver-Cadmium.L. E. Drain - 1959 - Philosophical Magazine 4 (40):484-501.
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  4.  3
    Nuclear Magnetic Resonance in Intermetallic Compounds.G. W. West - 1964 - Philosophical Magazine 9 (102):979-991.
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  5.  3
    Nuclear Magnetic Resonance in Liquid Copper Alloys.R. L. Odle & C. P. Flynn - 1966 - Philosophical Magazine 13 (124):699-715.
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  6. Nuclear Magnetic Resonance Measurements in Vanadium-Gallium Alloys.Hans Lutgemeier - 1968 - In Peter Koestenbaum (ed.), Proceedings. [San Jose? Calif.. pp. 382.
     
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  7. Pulsed Nuclear Magnetic Resonance in Metal Single Crystals.K. TtTsec - 1968 - In Peter Koestenbaum (ed.), Proceedings. [San Jose? Calif.. pp. 462.
     
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  8.  2
    Application of Nuclear Magnetic Resonance Logging in the Low-Resistivity Reservoir — Taking the XP Area as an Example.Zhaoping Li, Chuqiao Gao, Bin Zhao, Yao Guan & Junyi Liu - 2020 - Interpretation 8 (4):T885-T893.
    With the deepening of exploration and development, many low-resistivity reservoirs have been found in the XP area. We have found that the genesis of these low-resistivity reservoirs is that they contain a lot of very fine sand, which leads to the high content of bound water in the reservoirs and reduces resistivity. Compared with normal oil reservoirs, these reservoirs show low resistivity and high natural gamma, which makes it difficult to identify reservoirs qualitatively and calculate parameters quantitatively. Using conventional logging (...)
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  9.  19
    Nuclear Magnetic Resonance Studies on the Structure and Function of Rhodopsin.Steven O. Smith - 1995 - Behavioral and Brain Sciences 18 (3):488-489.
    Magic angle spinning (MAS) NMR methods provide a means of obtaining high resolution structural data on rhodopsin and its photoin termediates. Current work has focused on the structure of the retinal chromophore and its interactions with surrounding protein charges. The recent development of MAS NMR methods for measuring internuclear distances with a resolution of ∼0.2 will complement diffraction methods for addressing key mechanistic questions.
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  10.  5
    Nuclear Magnetic Resonance in Bulk Nickel Samples.Lawrence H. Bennett - 1965 - Philosophical Magazine 12 (115):213-215.
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  11.  8
    A Nuclear Magnetic Resonance Study of the Precipitation Sequence of Metastable Phases in an Al-4 Wt.% Cu Alloy.F. Nakamura, N. Matsumoto, K. Furukawa & J. Takamura - 1977 - Philosophical Magazine 36 (6):1355-1365.
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  12.  28
    Radial-Basis-Function-Based Nuclear Magnetic Resonance Heavy Oil Viscosity Prediction Model for a Kuwait Viscous Oil Field.Khalid Ahmad, Faisal Hassan, Prasanta Kumar Mishra, Waleed Al-Khamees, Wei Shao, Songhua Chen, Magdalena Sandor & Yuesheng Cheng - 2016 - Interpretation: SEG 4 (2):SF81-SF92.
    Characterizing heavy oil viscosity by nuclear magnetic resonance relaxation time measurements is much more challenging than characterizing light oil viscosities. Crude oils contain a wide range of hydrocarbons, resulting in broad [Formula: see text] and [Formula: see text] distributions that vary with the oil composition. Most often, a single geometric mean value [Formula: see text] or [Formula: see text] is correlated with the crude oil viscosity, which cannot accurately account for the inherent complexity of the oil constituent (...)
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  13.  2
    Nuclear Magnetic Resonance in Indium Antimonide I. The Effect of Impurities.E. H. Rhoderick - 1958 - Philosophical Magazine 3 (30):545-563.
  14.  10
    Nuclear Magnetic Resonance Reveals ‘Forbidden’ Symmetries in Quasicrystals and Related Metallic Alloys with Giant Unit Cells.P. Jeglič, M. Klanjšek & J. Dolinšek - 2007 - Philosophical Magazine 87 (18-21):2687-2692.
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  15.  3
    Nuclear Magnetic Resonance in Impure Indium Antimonide.M. H. Cohen - 1958 - Philosophical Magazine 3 (30):564-566.
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  16.  12
    Nuclear Magnetic Resonance of Nickel and Titanium in Some Intermetallic Compounds.L. E. Drain & G. W. West - 1965 - Philosophical Magazine 12 (119):1061-1063.
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  17.  10
    New Approaches of 3D Nuclear Magnetic Resonance Inversion for Improving Fluid Typing.Songhua Chen, Wei Shao & Ron Balliet - 2016 - Interpretation: SEG 4 (2):SF67-SF79.
    We have developed two new approaches for improving the efficiency and robostness of 2D and 3D inversion processing and interpretation from nuclear magnetic resonance logging data. The first improved method consists of a dual-step inversion method to obtain [Formula: see text] and [Formula: see text] maps independently, rather than deriving one from the other. The second approach is an inversion-forward modeling-inversion technique for obtaining [Formula: see text] and [Formula: see text] maps using the same acquired data used (...)
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  18.  1
    Nuclear Magnetic Resonance in Liquid Sodium Alloys.S. H. Kellington & J. M. Titman - 1967 - Philosophical Magazine 15 (137):1045-1049.
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  19.  1
    Nuclear Magnetic Resonance and Susceptibility Measurements in Intermetallic Compounds.G. W. West - 1967 - Philosophical Magazine 15 (136):855-866.
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  20.  1
    Nuclear Magnetic Resonance in Β Brass.G. W. West - 1960 - Philosophical Magazine 5 (57):899-907.
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  21.  2
    Nuclear Magnetic Resonance in Lithium and Dilute Lithium-Magnesium Alloys.D. G. Hughes - 1960 - Philosophical Magazine 5 (53):467-471.
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  22.  7
    Paramagnetic Nanoparticles as Nuclear Magnetic Resonance Contrast Agents in Sandstone: Importance of Nanofluid-Rock Interactions.Chunxiao Zhu, Hugh Daigle & Steven L. Bryant - 2016 - Interpretation: SEG 4 (2):SF55-SF65.
    Nuclear magnetic resonance has been applied in well logging to investigate pore size distribution with high resolution and accuracy based on the relaxation time distribution. However, due to the heterogeneity of natural rock, pore surface relaxivity, which links relaxation time and pore size, varies within the pore system. To analyze and alter pore surface relaxivity, we saturated Boise sandstone cores with positively charged zirconia nanoparticle dispersions in which nanoparticles can be adsorbed onto the sandstone pore wall, while (...)
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  23. Models of Scientific Development and the Case of Nuclear Magnetic Resonance.Henk Zandvoort - 1986 - Springer.
    From the nineteen sixties onwards a branch of philosophy of science has come to development, called history-oriented philosophy of science. This development constitutes a reaction on the then prevailing logical empiricist conception of scientific knowledge. The latter was increasingly seen as suffering from insurmountable internal problems, like e. g. the problems with the particular "observational-theoretical distinction" on which it drew. In addition the logical empiricists' general approach was increasingly criticized for two external shortcomings. Firstly, the examples of scientific knowledge that (...)
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  24.  38
    Instrument Makers and Discipline Builders: The Case of Nuclear Magnetic Resonance.Timothy Lenoir & Christophe Lécuyer - 1995 - Perspectives on Science 3 (3):276-345.
    Crucial to the establishment of a scientific discipline is a body of knowledge organized around a set of instruments, interpretive techniques, and regimes of training in their application. In this paper, we trace the involvement of scientists and engineers at Varian Associates in the development of nuclear magnetic resonance spectrometers from the first demonstrations of the NMR phenomenon in 1946 to the definitive takeoff of NMR as a chemical discipline by the mid-1960s. We examine the role of (...)
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  25.  7
    Protein Structure Determination by Nuclear Magnetic Resonance.Robert M. Cooke & Iain D. Campbell - 1988 - Bioessays 8 (2‐3):52-56.
  26.  1
    Strain-Broadening of Nuclear Magnetic Resonance Lines in Copper.E. A. Faulkner - 1960 - Philosophical Magazine 5 (56):843-851.
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  27.  14
    Inversion of the Permeability of a Tight Gas Reservoir with the Combination of a Deep Boltzmann Kernel Extreme Learning Machine and Nuclear Magnetic Resonance Logging Transverse Relaxation Time Spectrum Data.Linqi Zhu, Chong Zhang, Yang Wei, Xueqing Zhou, Yuyang Huang & Chaomo Zhang - 2017 - Interpretation: SEG 5 (3):T341-T350.
    In view of the low accuracy of the existing nuclear magnetic-resonance logging permeability model in tight sandstone reservoirs, we derive a relationship between the NMR [Formula: see text] spectrum and permeability based on the transverse relaxation theory of NMR and the Kozeny-Carman equation. We determined the reasons for the low accuracy of the model through the theoretical analysis. We have developed the deep Boltzmann kernel extreme learning machine to improve the deep-learning algorithm and to predict the reservoir (...)
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  28.  3
    Predicting Oil Saturation of Shale-Oil Reservoirs Using Nuclear Magnetic Resonance Logs.Lichun Kuang, Zhenlin Wang, Cheng Feng, Peiqiang Zhao, Rui Mao & Jing Yu - 2020 - Interpretation 8 (3):SL35-SL43.
    Oil saturation is an important parameter in shale-oil reservoir evaluation. However, due to complex wettability and pore construction, we find that conventional resistivity and nuclear magnetic resonance methods do not perform well in calculating oil saturation in shale-oil reservoirs. Hence, we have developed a practical NMR-based method to calculate the oil saturation of the Lucaogou shale-oil Formation, Permian, in Jimusar Sag, Junggar Basin, China. First, we analyze the relationships among the wettability, oil saturation, and [Formula: see text] (...)
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  29. The Mobility of Continental Shale Oil by Gas Flooding and Influencing Factors Based on Displacement-Nuclear Magnetic Resonance Instruments.Qiuli Huo, Li Fu, Min Wang, Ming Li, Jinxu Zhang & Huaseng Zeng - 2022 - Interpretation 10 (3):SD61-SD74.
    The efficient development of shale oil is a challenging problem for researchers. Conventional experiments for characterizing fluid distribution encounter a bottleneck because of the special composition, complex pore structure, and unclear fluid occurrence in shale oil reservoirs. Targeting continental shale in eastern China, we used high-temperature and high-pressure displacement instruments combined with nuclear magnetic resonance instruments for the first time to evaluate the shale oil mobility under different gases flooding for simulating “huff-n-puff” in the field. Results found (...)
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  30.  16
    A New Use of the Kronig-Kramers Relations in Nuclear Magnetic Resonance.H. C. Bolton, G. J. Troup & G. V. H. Wilson - 1964 - Philosophical Magazine 9 (100):591-605.
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  31.  3
    A Fast Inversion Method of 2D Nuclear Magnetic Resonance Based on the Novel Hybrid Algorithm.Hai-Tao Li & Shao-Gui Deng - 2020 - Interpretation 8 (4):T823-T833.
    To make up for the limitations and improve the accuracy of 1D nuclear-magnetic-resonance logging in the evaluation of formation fluid properties, 2D NMR logging has become the focus of research. Increasing the sequence and inversion parameters of the 2D NMR can effectively improve the antinoise properties and resolution of the inversion, but at the same time, the reduced inversion speed and increased memory occupied will put forward higher requirements on the computer configuration and add to the cost (...)
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  32. Models of Scientific Development and the Case of Nuclear Magnetic Resonance.Henk Zandvoort - 1989 - Studia Logica 48 (3):395-396.
     
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  33.  2
    A Fast Inversion Method of the Two-Dimensional Nuclear Magnetic Resonance Based on the Novel Hybrid Algorithm.Hai-Tao Li & Shao-Gui Deng - forthcoming - Interpretation:1-62.
    To make up for the limitations and improve the accuracy of 1D nuclear magnetic resonance logging in the evaluation of formation fluid properties, 2D NMR logging has become the focus of research. Increasing the sequence and inversion parameters of the 2D NMR can effectively improve the antinoise properties and resolution of the inversion, but at the same time, the reduced inversion speed and increased memory occupied will put forward higher requirements on the computer configuration and add to (...)
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  34.  1
    Petrophysical Properties Difference of Organic-Rich and Organic-Poor Shale Reservoir Using Low-Field Nuclear Magnetic Resonance Experiment in the Sangzhi Block, South China.Gang Zhao, Wenlong Ding, Yaxiong Sun, Siyu Shi, Baocheng Jiao, Li Tian, Peng Chen, Zhan Zhao & Ning Sun - 2020 - Interpretation 8 (4):T895-T905.
    The petrophysical properties of rocks have an important influence on shale quality. To characterize the difference of petrophysical properties between organic-rich and organic-poor shale reservoirs, we used the low-field nuclear magnetic resonance technique and field emission scanning electron microscopy analysis after argon-ion polishing or natural section to measure porosity and permeability from six core samples from well SY6 in the Sangzhi block, Northwest Hunan province. Some information about pore types, pore structure, residual porosity, movable porosity, and permeability (...)
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  35.  2
    Textural and Pore Size Analysis of Carbonates From Integrated Core and Nuclear Magnetic Resonance Logging: An Arbuckle Study.John Doveton & Lynn Watney - 2015 - Interpretation: SEG 3 (1):SA77-SA89.
    The T2 relaxation times recorded by nuclear magnetic resonance logging are measures of the ratio of the internal surface area to volume of the formation pore system. Although standard porosity logs are restricted to estimating the volume, the NMR log partitions the pore space as a spectrum of pore sizes. These logs have great potential to elucidate carbonate sequences, which can have single, double, or triple porosity systems and whose pores have a wide variety of sizes and (...)
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  36.  8
    A New Use of the Kronig-Kramers Relations in Nuclear Magnetic Resonance. II.G. J. Troup & J. Walter - 1965 - Philosophical Magazine 11 (113):1059-1066.
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  37.  13
    Models of Scientific Development and the Case of Nuclear Magnetic Resonance. Henk Zandvoort.John S. Rigden - 1988 - Isis 79 (3):473-474.
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  38.  12
    Henk Zandvoort. Models of Scientific Development and the Case of Nuclear Magnetic Resonance. Dordrecht: D. Reidel, 1986. Pp. Xiii + 305. ISBN 90-277-2351-6. £49.50, Dfl. 115.00. [REVIEW]Andy Pickering - 1987 - British Journal for the History of Science 20 (4):481-482.
  39.  14
    Sample Document – Inversion of the Permeability of a Tight Gas Reservoir with the Combination of a Deep Boltzmann Kernel Extreme Learning Machine and Nuclear Magnetic Resonance Logging Transverse Relaxation Time Spectrum Data.Linqi Zhu, Chong Zhang, Yang Wei, Xueqing Zhou, Yuyang Huang & Chaomo Zhang - forthcoming - Interpretation: SEG:1-43.
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  40.  19
    Determination of the Predominant Type of Stacking Fault in Cobalt by Nuclear Magnetic Resonance and Electron Microscopy.L. E. Toth, T. R. Cass, S. F. Ravitz & J. Washburn - 1964 - Philosophical Magazine 9 (100):607-616.
  41.  27
    Molecular Beam Measurements of Nuclear Moments Before Magnetic Resonance. Part I: I. I. Rabi and Deflecting Magnets to 1938. [REVIEW]Paul Forman - 1998 - Annals of Science 55 (2):111-160.
    Investigation of the origin and function of three magnets from I. I. Rabi's laboratory at Columbia University leads to a closer inquiry into the early history of molecular beam evaluations of the angular momenta and magnetic moments of atomic nuclei than has been undertaken heretofore. The resulting insights into the background and the course of Rabi's research programme would probably not have occurred without the orientation enforced by these artifacts.
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  42. Quantum Read-Out and Fast Initialization of Nuclear Spin Qubits with Electric Currents.Noah Stemeroff - 2011 - Physical Review Letters 19 (107).
    Nuclear spin qubits have the longest coherence times in the solid state, but their quantum readout and initialization is a great challenge. We present a theory for the interaction of an electric current with the nuclear spins of donor impurities in semiconductors. The theory yields a sensitivity criterion for quantum detection of nuclear spin states using electrically detected magnetic resonance, as well as an all-electrical method for fast nuclear spin qubit initialization.
     
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  43. Hidden Space Energy. The Heterodyne Resonance Mechanism. Theory and Experiments.Stoyan Sargoytchev - 2020
    According to the BSM Supergravitation Unified Theory, the physical vacuum contains energy that is not of electromagnetic origin. The Heterodyne Resonance Mechanism (HRM) predicted by the theory permits access to this hidden energy by a process involving the anomalous magnetic moment and the quantum mechanical spin flipping of the electron. Plasma experiments and analysis of lightning observations indicate that the HRM effect could be involved in the natural lightning phenomena. Although the energy density of this hidden source is (...)
     
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  44.  2
    Functional Magnetic Resonance Imaging and Functional Near-Infrared Spectroscopy: Insights From Combined Recording Studies.Vanessa Scarapicchia, Cassandra Brown, Chantel Mayo & Jodie R. Gawryluk - 2017 - Frontiers in Human Neuroscience 11.
  45.  14
    Functional Magnetic Resonance Imaging, Covert Awareness, and Brain Iniury.Adrian M. Owen - 2011 - In Judy Illes & Barbara J. Sahakian (eds.), Oxford Handbook of Neuroethics. Oxford University Press. pp. 135.
    Rapid technological advances have produced a variety of novel techniques that allow a comprehensive assessment of brain function to be combined with detailed information about brain structure and connectivity. Any assessment that is based on exhibited behavior after brain injury will be prone to error for a number of reasons. These questions are explored in the context of recent studies in both healthy populations and brain injured patients that have sought to investigate covert awareness through the use of functional neuroimaging. (...)
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  46. Pediatric Magnetic Resonance Research and the Minimal-Risk Standard.Matthias Schmidt, Jennifer Marshall, Jocelyn Downie & Michael Hadskis - 2011 - IRB: Ethics & Human Research 33 (5):1-6.
    While an accurate assessment of risk is always important, it is especially so in pediatric research. Recognizing the pivotal nature of the minimal-risk standard, we set out to determine under what circumstances pediatric magnetic resonance imaging research does or does not meet this standard. We found that while the physical and psychological risks that attend the MRI procedure do not exceed minimal risk, the sedation and contrast enhancement that are sometimes associated with MRI research do, as both exceed (...)
     
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  47. Quantum Information: An Overview.Gregg Jaeger - 2007 - New York, NY, USA: Springer.
    This book gives an overview for practitioners and students of quantum physics and information science. It provides ready access to essential information on quantum information processing and communication, such as definitions, protocols and algorithms. Quantum information science is rarely found in clear and concise form. This book brings together this information from its various sources. It allows researchers and students in a range of areas including physics, photonics, solid-state electronics, nuclear magnetic resonance and information technology, in their (...)
     
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  48.  33
    Unstable Particles, Gauge Invariance and the Δ++ Resonance Parameters.Gabriel López Castro & Alejandro Mariano - 2003 - Foundations of Physics 33 (5):719-734.
    The elastic and radiative π + p scattering are studied in the framework of an effective Lagrangian model for the Δ ++ resonance and its interactions. The finite width effects of this spin-3/2 resonance are introduced in the scattering amplitudes through a complex mass scheme to respect electromagnetic gauge invariance. The resonant pole (Δ ++) and background contributions (ρ 0, σ, Δ, and neutron states) are separated according to the principles of the analytic S-matrix theory. The mass and (...)
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  49. Ethical Considerations in Functional Magnetic Resonance Imaging Research in Acutely Comatose Patients.Charles Weijer, Tommaso Bruni, Teneille Gofton, G. Bryan Young, Loretta Norton, Andrew Peterson & Adrian M. Owen - 2015 - Brain:0-0.
    After severe brain injury, one of the key challenges for medical doctors is to determine the patient’s prognosis. Who will do well? Who will not do well? Physicians need to know this, and families need to do this too, to address choices regarding the continuation of life supporting therapies. However, current prognostication methods are insufficient to provide a reliable prognosis. -/- Functional Magnetic Resonance Imaging (MRI) holds considerable promise for improving the accuracy of prognosis in acute brain injury (...)
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  50.  9
    Functional Magnetic Resonance Imaging (Fmri) in the Classroom.Allyson C. Rosen - 2009 - American Journal of Bioethics 9 (1):30 – 31.
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