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Journal articles on the topic 'Disk refiner'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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1

Lee, Ji-Young, Chul-Hwan Kim, Sol Kwon, Min-Seok Lee, and Byung-Gul Min. "Representative Effects of Valley Beater and Disk Refiner on Pulp Fibers." Journal of Korea Technical Association of the Pulp and Paper Industry 48, no. 5 (2016): 37. http://dx.doi.org/10.7584/jktappi.2016.10.48.5.37.

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2

Zhu, J. Y., and Gary C. Myers. "Kraft pulp from budworm-infested Jack pine." Holzforschung 60, no. 4 (2006): 383–88. http://dx.doi.org/10.1515/hf.2006.060.

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Abstract This study evaluated the quality of kraft pulp from budworm-infested jack pine. The logs were classified as merchantable live, suspect, or merchantable dead. Raw materials were evaluated through visual inspection, analysis of the chemical composition, SilviScan measurement of the density, and measurement of the tracheid length. Unbleached pulps were then refined using a laboratory disk refiner. The mechanical and optical properties of handsheets made from the refined pulps were evaluated. Although budworm galleries may affect the physical integrity of the wood, they have no effect on

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3

Fukuoka, Shigeru, Tadahiro Sugawara, Osamu Kawase, and Kazuyuki Fujita. "Optimazation of the Double Disk Refiner for Stock Preparation. Reduction of Energy Consumption by Reducing the Number of Refiners." JAPAN TAPPI JOURNAL 52, no. 11 (1998): 1568–74. http://dx.doi.org/10.2524/jtappij.52.1568.

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4

JOHNSON, DONNA, MARK PAPADIS, MICHAEL BILODEAU, BRUCE CROSSLEY, MARC FOULGER, and PIERRE GELINAS. "Effects of cellulosic nanofibrils on papermaking properties of fine papers." TAPPI Journal 15, no. 6 (2016): 395–402. http://dx.doi.org/10.32964/tj15.6.395.

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Cellulosic nanofibrils (CNF) were produced in a disk refiner, to various fines contents. This material was used as an additive to papermaking furnish at laboratory and pilot scales. Handsheets showed improved strength and surface properties with the addition of CNF. Properties also tended to improve with increasing fines content of CNF. Desired strength properties were achieved using CNF at different fines contents by adjusting the loading levels of CNF. On a pilot scale, CNF allowed an increased ash level while maintaining control properties. Strength and surface properties were generally enh

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5

Voigt, Claudia, Beate Fankhänel, Björn Dietrich, et al. "Influence of Ceramic Foam Filters with Al2O3 Nanocoating on the Aluminum Filtration Behavior Tested With and Without Grain Refiner." Metallurgical and Materials Transactions B 51, no. 5 (2020): 2371–80. http://dx.doi.org/10.1007/s11663-020-01900-1.

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Abstract In industrial applications, filter materials are often chosen according to cost as well as their processing and thermomechanical properties, but rarely in terms of their behavior during filtration, which is largely due to there being insufficient information available on the influence of filter materials and surface quality on filtration behavior. In this study, the manufacture of functionalized Al2O3 nanofilters was investigated, along with their filtration performance in short- and long-term filtration trials. In addition, sessile drop tests were performed to measure the contact ang

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6

Wistara, Nyoman J., Wulan Starini, Fauzi Febrianto, and Gustan Pari. "Binderless MDF from Hydroxymethylated Kenaf Pulp." Jurnal Ilmu Kehutanan 12, no. 1 (2018): 3. http://dx.doi.org/10.22146/jik.34031.

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Modified lignin with improved reactivity can be a potential alternative for synthetic phenol formaldehyde resin for the adhesive of wood composite. Direct hydroxymethylation of kenaf in the present experiments was intended to increase lignin reactivity, and therefore was expected to result in satisfying properties of binderless MDF. The stem of kenaf was refined in a disk refiner and the refined fibers were hydroxymethylated in various levels of alkalinity. The concentration of NaOH during hydroxymethylation was of 3%, 6% and 12%. Wet process was applied to produce MDF (30 cm x 30 cm x 1 cm) w

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7

CORREIA, THIAGO R., JESSICA PALOMA A. BARROS, CAIO C. SANTOS, et al. "CHARACTERIZATION OF SPONGE-GOURD RESIDUE PRETREATED BY MECHANICAL DISC REFINING." Cellulose Chemistry and Technology 55, no. 1-2 (2021): 149–57. http://dx.doi.org/10.35812/cellulosechemtechnol.2021.55.16.

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The present works describes the effect produced by mechanical disc refining in the pretreatment of lignocellulose agro-industrial waste, using scraps of sponge gourd. Two batches of sponge gourd scraps were refined in a laboratory disc refiner, at a consistence of 2.9 wt% (fiber/water) and residence time of 2 and 4 min. The two batches were then coded as MRS and HRS, respectively. MRS and HRS samples, as well as non-refined sponge gourd (NRS), were characterized in terms of morphological aspects, structural characteristics and thermal behavior. The analysis of SEM micrographs revealed that int

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8

Whalley, R., and D. Mitchell. "Disc refiner analysis." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 211, no. 3 (1997): 157–69. http://dx.doi.org/10.1243/0954408971529647.

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A general non-linear model of a disc refiner for the preparation of the raw material used in paper and board manufacture, from processed mechanical and chemical pulp, is derived. Thereafter, a linear description is constructed for analysis and process design purposes. The time domain responses of the models are presented for purposes of comparison and simulation is employed to confirm the predicted condition of torsional resonance. The effect of this excitation on the reciprocal shredding and shearing action of the machine is commented upon.

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9

Dudorov, A. E., and R. E. Pudritz. "An MHD Model of Be Stars with Disks." International Astronomical Union Colloquium 175 (2000): 611–16. http://dx.doi.org/10.1017/s0252921100056633.

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AbstractAn investigation of the formation and evolution of Be stars show that these stars could have dipolar fossil magnetic fields. This magnetic field should constrain the circumstellar magnetic disk and influence its dynamical features. For studying these effects we refine the alphamodel of accretion disks of Shakura and Sunyaev by incorporating into this model the evolution of large-scale magnetic fields. In the frame of our model we can investigate the rotational history of the star with the disk and the ionization and thermal properties of disks. We show in particular that in the magneto

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10

Maraj, E. N., and Shakil Shaiq. "Rotational impact on nanoscale particles Fe2O4, NiZnFe2O4, MnZnFe2O4 suspended in C2H6O2 confined between two stretchable disks: a computational study." Canadian Journal of Physics 98, no. 3 (2020): 312–25. http://dx.doi.org/10.1139/cjp-2019-0208.

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This communication addresses the fluid and heat transfer flanked by two stretchable rotating disks influenced by the induced magnetic field. The fluid flows due to the rotation of the stretchable disks enclosing a nanofluid having nanoparticles of three distinct ferrite compounds. The mathematical formulation of the problem is performed in a cylindrical coordinate system. Similarity analysis is applied for the sake of simplification. The velocity, pressure, induced magnetic field, and temperature distributions accompanied by surface drag force and heat flux are computed numerically by employin

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11

Mayama, Satoshi, Motohide Tamura, Tomoyuki Hanawa, et al. "Direct Imaging of Bridged Twin Protoplanetary Disks in a Young Multiple Star." Proceedings of the International Astronomical Union 7, S282 (2011): 425–28. http://dx.doi.org/10.1017/s1743921311027979.

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AbstractProtoplanetary disks are ubiquitously observed around young solar-mass stars and are considered to be not only natural by-products of stellar evolution but also precursors of planet formation. If a forming star has close companions, the protoplanetary disk may be seriously influenced. It is important to consider this effect because most stars form as multiples. Thus, studies of protoplanetary disks in multiple systems are essential to describe the general processes of star and planet formation.We present the direct image of an interacting binary protoplanetary system. We obtained an in

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12

Sofyarto, Bakti, Athanasius Priharyoto Bayuseno, and Sri Nugroho. "IDENTIFIKASI MATERIAL DAN KERUSAKAN DISC REFINER AIRAGHI DI PT. PURA NUSA PERSADA UNIT PAPER MILL 8 KUDUS." ROTASI 15, no. 3 (2013): 8. http://dx.doi.org/10.14710/rotasi.15.3.8-13.

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Refining adalah proses penggilingan bubur serat lanjut untuk menghasilkan bubur serat yang lebih halus. Setelah itu bubur serat tersebut diolah kembali dengan cara dipotong dan digiling dengan menggunakan 2 buah pisau pemotong yang berbentuk bilah plat (disc plate atau disc refiner). Masalah yang dihadapi pada proses refining adalah kegagalan pada pisau disc refiner akibat proses abrasif dan keausan. Tujuan penelitian ini adalah melakukan identifikasi material disc refiner yang digunakan, studi metallografi terhadap material disc refiner yang digunakan, menentukan dan mencari penyebab terjadin

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13

Dullerud, R., T. Amundsen, J. G. Johansen, and B. Magnæs. "Lumbar Percutaneous Automated Nucleotomy." Acta Radiologica 34, no. 6 (1993): 536–42. http://dx.doi.org/10.1177/028418519303400602.

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The purpose of this study was to evaluate 2 years' experience with percutaneous automated nucleotomy. Adult patients with small to medium sized disk hernias corresponding to clinical symptoms, and without evidence of free fragments or stenosis were treated on an outpatient basis. All patients had sciatica and conservative treatment had failed for at least 3 months. Using the Nucleotome R system, access to the disk was achieved in all but 6 of 172 disks in 152 patients. Degenerative disk disease or pain was the reason for technical failures. Four other procedures were discontinued because of pa

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14

Anderssou, Stefan, Christer Sandberg, and Per Engstrand. "MECHANICAL PULPING.Effect of long fibre concentration on low consistency refining of mechanical pulp." Nordic Pulp & Paper Research Journal 27, no. 4 (2012): 702–6. http://dx.doi.org/10.3183/npprj-2012-27-04-p702-706.

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Abstract The aim of this study was to investigate the influence of lang fibre concentration on Ioadability and pulp properties during LC refming of mechanical pulp. Lang fibre concentration was adjusted to three different Ievels by screen fractionation of the pulp. The three pulps were refined in a single disc pilot scale LC refiner at simi1ar process conditions. Increased lang fibre concentration suppmied a larger refiner gap and resulted in less fibre . cutting at a given specific energy consumption. The higher lang fibre concentration probably contributed to a stronger fibre network that ma

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15

Vikharev, S. "Longitudial fluctuations of rotors of disk knife refiners." IOP Conference Series: Materials Science and Engineering 734 (January 29, 2020): 012044. http://dx.doi.org/10.1088/1757-899x/734/1/012044.

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16

Kerekes, Richard J. "Characterization of pulp refiners by a C-factor." Nordic Pulp & Paper Research Journal 5, no. 1 (1990): 3–8. http://dx.doi.org/10.3183/npprj-1990-05-01-p003-008.

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17

Petit dit de la Roche, D. J. M., N. Oberg, M. E. van den Ancker, et al. "New mid-infrared imaging constraints on companions and protoplanetary disks around six young stars." Astronomy & Astrophysics 648 (April 2021): A92. http://dx.doi.org/10.1051/0004-6361/202039261.

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Context. Mid-infrared (mid-IR) imaging traces the sub-micron and micron-sized dust grains in protoplanetary disks and it offers constraints on the geometrical properties of the disks and potential companions, particularly if those companions have circumplanetary disks. Aims. We use the VISIR instrument and its upgrade NEAR on the VLT to take new mid-IR images of five (pre-)transition disks and one circumstellar disk with proposed planets and obtain the deepest resolved mid-IR observations to date in order to put new constraints on the sizes of the emitting regions of the disks and the presence

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18

Kondora, Grzegorz, and Dariusz Asendrych. "Flow modelling in a low consistency disc refiner." Nordic Pulp & Paper Research Journal 28, no. 1 (2013): 119–30. http://dx.doi.org/10.3183/npprj-2013-28-01-p119-130.

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19

V., Volsky,. "The results of research to clarify the process of cutting soil spherical disk working body." Mehanization and electrification of agricultural, no. 9(108) (2019): 30–36. http://dx.doi.org/10.37204/0131-2189-2019-9-3.

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Purpose. Clarify the size and direction of cutting the soil, taking into account the influence of the coordinates of the instantaneous center of the disk on the rotation of its diameter at the time of its location in a vertical position. Methods. Using the provisions of physics, theoretical mechanics and resistance of materials. Results. The influence of the coordinates of the location of the instantaneous center of the disk on the angle of cutting of the soil by the points of the blade of the disk and the vectors of their trajectory in the soil medium is established, which makes it possible t

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20

Watson, W. D., B. K. Wallin, and H. W. Wyld. "Maser Radiation from a Turbulent Keplerian Disk: NGC 4258." International Astronomical Union Colloquium 164 (1998): 225–26. http://dx.doi.org/10.1017/s0252921100045310.

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AbstractCalculations are summarized for the spectral and spatial distribution of maser radiation that emerges from a turbulent Keplerian disk when viewed nearly edge-on. A close comparison is made with the refined observational data about the masing accretion disk around the presumed massive black hole at the nucleus of the galaxy NGC 4258.

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21

O’Brien, K., and D. Harris. "Head/Disk Interface Contact Detection Using a Refined Acoustic Emission Technique." Journal of Tribology 118, no. 3 (1996): 539–42. http://dx.doi.org/10.1115/1.2831571.

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A refined technique using Acoustic Emission has been developed for use in head/disk interface contact detection. These refinements are focused on the design parameters of the Acoustic Emission electronics, amplification and filter settings, which permit accurate and repeatable contact detection measurements. A technique for determining the slider body natural frequencies is described in order that the proper filter design parameters can be determined. Experiments confirm the existence of these frequencies for a Al2O3TiC 50 percent slider are in excess of 600 KHz.

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22

Zaika, G. A., A. S. Kosmodamianskii, and V. I. Storozhev. "Refined analysis of the harmonic vibrations of disk-shaped orthotropic plates." Journal of Soviet Mathematics 56, no. 6 (1991): 2796–99. http://dx.doi.org/10.1007/bf01097457.

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23

Liu, Huan, Jixian Dong, Xiya Guo, et al. "No-Load Power of Disc Refiner in Low Consistency Refining." Journal of Korea Technical Association of the Pulp and Paper Industry 52, no. 2 (2020): 87–96. http://dx.doi.org/10.7584/jktappi.2020.04.52.2.87.

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24

Kobayashi, Seikichi. "New Conical-Disc Refiner. The key machine for Mechanical Pulping." JAPAN TAPPI JOURNAL 46, no. 2 (1992): 287–99. http://dx.doi.org/10.2524/jtappij.46.287.

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25

Alahautala, Taito, Erkki Lassila, Rolf Hernberg, Esko Härkönen, and Petteri Vuorio. "Optical measurement of pulp quantity in a rotating disc refiner." Measurement Science and Technology 15, no. 11 (2004): 2256–62. http://dx.doi.org/10.1088/0957-0233/15/11/011.

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26

Karande, V. S., A. K. Bharimalla, G. B. Hadge, S. T. Mhaske, and N. Vigneshwaran. "Nanofibrillation of cotton fibers by disc refiner and its characterization." Fibers and Polymers 12, no. 3 (2011): 399–404. http://dx.doi.org/10.1007/s12221-011-0399-3.

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27

SANDBERG, CHRISTER, JAN-ERIK BERG, and PER ENGSTRAND. "Low consistency refining of mechanical pulp — system design." July 2017 16, no. 7 (2017): 419–29. http://dx.doi.org/10.32964/tj16.7.419.

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Many mechanical pulping mills use low consistency (LC) refining for energy efficient fiber development. In this study, energy efficiency and pulp quality were evaluated for six processes, of which four included LC refining. We studied two different types of chip refiners – single disc (SD) and double disc (DD) – with LC refining in the main and reject lines. All process combinations have been used in the Holmen Paper Braviken mill, Sweden, to make thermomechanical pulp for printing papers. LC refining was more energy efficient than high consistency (HC) refining at certain tensile index increa

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28

Halpern, Jules P., and Kaiyou Chen. "New Evidence for Accretion Disks in AGNs." Symposium - International Astronomical Union 134 (1989): 245–50. http://dx.doi.org/10.1017/s007418090014094x.

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We have refined our calculation of the line profile of a relativistic, Keplerian disk by incorporating a variety of emissivity laws, as well as broadening due to turbulence or electron scattering. The significant improvement in the fit to the double-peaked Ha line profile of the elliptical radio galaxy Arp 102B provides the most convincing direct evidence for an accretion disk in any AGN. Arp 102B appears to be a low-luminosity analog of 3C 390.3, and several lines of evidence point to the existence of small, hot ion tori illuminating an outer thin disk in both of these galaxies. The rarity of

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29

Vititnev, Aleksandr Yur'yevich, Yuriy Davydovich Alashkevich, Natal'ya Geral'dovna Chistova, Roman Aleksandrovich Marchenko, and Venera Nurullovna Matygullina. "RESEARCH OF PHYSICAL AND MECHANICAL PROPERTIES OF WOOD-FIBER MATERIALS." chemistry of plant raw material, no. 4 (December 21, 2020): 451–57. http://dx.doi.org/10.14258/jcprm.2020048150.

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This paper presents the results of experimental studies of the physical and mechanical properties of wood-fiber boards of the wet production method when regulating the design and technological parameters of the grinding process. This allowed us to determine the influence of the working clearance between the grinding discs and the concentration of fibre mass with the subject to of quality change wood fiber after defibrator using the developed construction of the disc fibrillation action on the physico-mechanical properties of boards. As a result of the experiment, regression models were obtaine

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30

Hall, Eric T., Elizabeth Hoesing, Endre Sinkovics, and Esther M. Verheyen. "Actomyosin contractility modulates Wnt signaling through adherens junction stability." Molecular Biology of the Cell 30, no. 3 (2019): 411–26. http://dx.doi.org/10.1091/mbc.e18-06-0345.

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Actomyosin contractility can influence the canonical Wnt signaling pathway in processes like mesoderm differentiation and tissue stiffness during tumorigenesis. We identified that increased nonmuscle myosin II activation and cellular contraction inhibited Wnt target gene transcription in developing Drosophila imaginal disks. Genetic interactions studies were used to show that this effect was due to myosin-induced accumulation of cortical F-actin resulting in clustering and accumulation of E-cadherin to the adherens junctions. This results in E-cadherin titrating any available β-catenin, the Wn

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31

Mulcahy, D. D., A. Horneffer, R. Beck, et al. "Investigation of the cosmic ray population and magnetic field strength in the halo of NGC 891." Astronomy & Astrophysics 615 (July 2018): A98. http://dx.doi.org/10.1051/0004-6361/201832837.

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Context. Cosmic rays and magnetic fields play an important role for the formation and dynamics of gaseous halos of galaxies. Aims. Low-frequency radio continuum observations of edge-on galaxies are ideal to study cosmic-ray electrons (CREs) in halos via radio synchrotron emission and to measure magnetic field strengths. Spectral information can be used to test models of CRE propagation. Free–free absorption by ionized gas at low frequencies allows us to investigate the properties of the warm ionized medium in the disk. Methods. We obtained new observations of the edge-on spiral galaxy NGC 891

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32

A.Zargar, Bashir, and Ahmad W.Manzoor. "Inequalities Concerning the Growth of Polynomials." Sultan Qaboos University Journal for Science [SQUJS] 23, no. 1 (2018): 68. http://dx.doi.org/10.24200/squjs.vol23iss1pp68-72.

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In this paper we consider a polynomial having no zeros in the disk . We investigate the dependence of on and obtain a refinement of a famous result due to Rivilin ([5], [7]). Our results not only generalize some polynomial inequalities but also refine a result by Aziz [1].

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33

Radnell, David, Eric Schippers, and Wolfgang Staubach. "A Hilbert manifold structure on the Weil–Petersson class Teichmüller space of bordered Riemann surfaces." Communications in Contemporary Mathematics 17, no. 04 (2015): 1550016. http://dx.doi.org/10.1142/s0219199715500169.

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We consider bordered Riemann surfaces which are biholomorphic to compact Riemann surfaces of genus g with n regions biholomorphic to the disk removed. We define a refined Teichmüller space of such Riemann surfaces (which we refer to as the WP-class Teichmüller space) and demonstrate that in the case that 2g + 2 - n > 0, this refined Teichmüller space is a Hilbert manifold. The inclusion map from the refined Teichmüller space into the usual Teichmüller space (which is a Banach manifold) is holomorphic. We also show that the rigged moduli space of Riemann surfaces with non-overlapping holomor

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34

Xu, Yu Fu, Wen Dong Li, Xian Guo Hu, and Qiong Jie Wang. "On the Corrosion Behavior of Refined Bio-Oil during Rubbing Process." Applied Mechanics and Materials 130-134 (October 2011): 1310–13. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.1310.

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The corrosion behavior during friction of refined bio-oil by distillation process was evaluated by high frequency reciprocating test rig. Both scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) were used to investigate the morphology and active elements contents on the rubbed surface on steel disk. The chemical structures of the oils and the topography and surface roughness of the wear scar were also studied by FTIR and surface roughness tester as well, respectively. The experimental results showed that corrosion behavior of bio-oil was improved after refining since th

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35

Ekbåge, Daniel, Lars Nilsson, and Helena Håkansson. "Time series analysis of refining conditions and estimated pulp properties in a chemi-thermomechanical pulp process." BioResources 14, no. 3 (2019): 5451–66. http://dx.doi.org/10.15376/biores.14.3.5451-5466.

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Frequently sampled process data from a conical disc refiner and infrequently sampled pulp data from a full scale chemi-thermomechanical pulp (CTMP) mill were evaluated to study autocovariance with aspects of potential dynamic modelling applicability. Two trial measurements with an online pulp analyzer at decreased sampling intervals were performed. For variability analysis, time-series containing up to one day of operational data were used. At the chip refiner, the clearest significant autocovariance was identified for the specific electricity consumption, based on the longer sequences. Most o

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36

Worpel, H., A. D. Schwope, I. Traulsen, K. Mukai, and S. Ok. "V902 Monocerotis: A likely disc-accreting intermediate polar." Astronomy & Astrophysics 617 (September 2018): A52. http://dx.doi.org/10.1051/0004-6361/201833472.

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Aims. We aim to confirm whether the eclipsing cataclysmic variable (CV) V902 Mon is an intermediate polar (IP), to characterise its X-ray spectrum and flux, and to refine its orbital ephemeris and spin period. Methods. We performed spectrographic observations of V902 Mon in 2016 with the 2.2 m Calar Alto telescope, and X-ray photometry and spectroscopy with XMM-Newton in October 2017. This data was supplemented by several years of AAVSO visual photometry. Results. We confirmed V902 Mon as an IP based on detecting the spin period, which has a value of 2208 s, at multiple epochs. Spectroscopy of

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37

Moran, James M., Elizabeth Humphreys, Lincoln Greenhill, Mark Reid, and Alice Argon. "The structure of the accretion disk in NGC 4258." Proceedings of the International Astronomical Union 3, S242 (2007): 391–98. http://dx.doi.org/10.1017/s1743921307013440.

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AbstractA wealth of new information about the structure of the maser disk in NGC 4258 has been obtained from a series of 18 VLBA observations spanning three years, as well as from 32 additional epochs of spectral monitoring data from 1994 to the present, acquired with the VLA, Effelsberg, and GBT. The warp of the disk has been defined precisely. The thickness of the maser disk has been measured to be 12 micro-arcseconds (FWHM), which is slightly smaller than previously quoted upper limits. Under the assumption that the masers trace the true vertical distribution of material in the disk, from t

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38

Quiroga-Nuñez, L. H., H. J. van Langevelde, Y. M. Pihlström, L. O. Sjouwerman, and A. G. A. Brown. "Finding evolved stars in the inner Galactic disk withGaia." Proceedings of the International Astronomical Union 12, S330 (2017): 245–48. http://dx.doi.org/10.1017/s1743921317005890.

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AbstractThe Bulge Asymmetries and Dynamical Evolution (BAaDE) survey will provide positions and line-of-sight velocities of ~20, 000 evolved, maser bearing stars in the Galactic plane. Although this Galactic region is affected by optical extinction, BAaDE targets may haveGaiacross-matches, eventually providing additional stellar information. In an initial attempt to cross-match BAaDE targets withGaia, we have found more than 5,000 candidates. Of these, we may expect half to show SiO emission, which will allow us to obtain velocity information. The cross-match is being refined to avoid false po

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39

El-Tahawy, Moustafa, Jenő Gubicza, Yi Huang, et al. "Evolution of Microstructure, Phase Composition and Hardness in 316L Stainless Steel Processed by High-Pressure Torsion." Materials Science Forum 879 (November 2016): 502–7. http://dx.doi.org/10.4028/www.scientific.net/msf.879.502.

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The evolution of phase composition, microstructure and hardness in 316L austenitic stainless steel processed by high-pressure torsion (HPT) was studied up to 20 turns. It was revealed that simultaneous grain refinement and phase transformation occur during HPT-processing. The γ-austenite in the initial material transformed gradually to ɛ-and α’-martensites due to deformation. After 20 turns of HPT the main phase was α’-martensite. The initial grain size of ~42 μm was refined to ~48 nm while the dislocation density increased to ~143 × 1014 m-2 in the α’-martensite phase at the disk periphery pr

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40

Cheng, Huaqing, B. F. Liu, Jieying Liu, Zhu Liu, Erlin Qiao, and Weimin Yuan. "Magnetic-reconnection-heated corona in active galactic nuclei: refined disc–corona model and application to broad-band radiation." Monthly Notices of the Royal Astronomical Society 495, no. 1 (2020): 1158–71. http://dx.doi.org/10.1093/mnras/staa1250.

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ABSTRACT A long-standing question in active galactic nucleus (AGN) research is how the corona is heated up to produce X-ray radiation much stronger than that arising from the viscous heating within the corona. In this paper, we carry out detailed investigations of magnetic-reconnection heating to the corona, specifically, studying how the disc and corona are self-consistently coupled with the magnetic field, and how the emergent spectra depend on the fundamental parameters of AGN. It is shown that diverse spectral shapes and luminosities over a broad bandpass from optical to X-ray can be produ

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Ferritsius, Rita, Olof Ferritsius, Jan Hill, Anders Karlström, and Karin Eriksson. "TMP properties and refining conditions in a CD82 chip refiner. Part I: Step changes of process variables, description of the tests." Nordic Pulp & Paper Research Journal 33, no. 1 (2018): 69–81. http://dx.doi.org/10.1515/npprj-2018-3002.

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Abstract The study explores how changes in process variables, residence time and pulp consistency in refining influence the pulp properties. The equipment utilized in this study was a conical disc chip refiner (RGP82CD) producing thermomechanical pulp (TMP). The focus was on the ratio between tensile index and specific energy consumption. Pulp properties were measured for composite pulp samples taken from the refiner blow line. Residence times and pulp consistencies were estimated by use of the extended entropy model. This showed that the CD-refiner, with the flat and conical refining zone, ha

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Wittberg, Lisa Prahl, Magnus Björkman, Gohar Khokhar, Ulla-Britt Mohlin, and Anders Dahlkild. "Flow conditions in the grooves of a Low-Consistency refiner." Nordic Pulp & Paper Research Journal 27, no. 2 (2012): 173–83. http://dx.doi.org/10.3183/npprj-2012-27-02-p173-183.

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Abstract The flow pattern in the grooves plays a major role for the homogeneity of refining as well as for the transfer and loading of fiber flocs in refining position on the bar edges. However, it is an area where very little information is available. In the present study, flow conditions in the grooves in a Low-Consistency (LC) - disc refiner were studied both experimentally and numerically. The experimental study involved high-speed imaging through a 3 cm peephole into a commercial refiner. The Computational Fluid Dynamics (CFD) simulation focused on the flow condition in a radial groove, c

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Grey, I. E., N. V. Y. Scarlett, and H. E. A. Brand. "Crystal chemistry and formation mechanism of non-stoichiometric monoclinic K-jarosites." Mineralogical Magazine 77, no. 3 (2013): 249–68. http://dx.doi.org/10.1180/minmag.2013.077.3.03.

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AbstractSyntheses in acidified hydrothermal (HT) solutions (1 N H2SO4 or stronger) produce monoclinic non-stoichiometric K-jarosites which contain Fe-site vacancies with long-range order. Syntheses in non-acidified HT solutions produce rhombohedral K-jarosites which contain relatively large numbers of Fe-site vacancies with no long-range order. Increasing the [Fe]/[K] ratio, reaction temperature and reaction time in non-acidified solutions promotes the formation of monoclinic jarosites which contain Fe-site vacancies with short-range order. A structural model including details of the ordering

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Widmark, A., C. Laporte, and P. F. de Salas. "Weighing the Galactic disk using phase-space spirals." Astronomy & Astrophysics 650 (June 2021): A124. http://dx.doi.org/10.1051/0004-6361/202140650.

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We present a new method for inferring the gravitational potential of the Galactic disk, using the time-varying structure of a phase-space spiral in the (z, w)-plane (where z and w represent vertical position and vertical velocity). Our method of inference extracts information from the shape of the spiral and disregards the bulk density distribution that is usually used to perform dynamical mass measurements. In this manner, it is complementary to traditional methods that are based on the assumption of a steady state. Our method consists of fitting an analytical model for the phase-space spiral

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Sandberg, Christer, Erik Nelsson, Birgitta A. Engberg, Jan-Erik Berg, and Per Engstrand. "Effects of chip pretreatment and feeding segments on specific energy and pulp quality in TMP production." Nordic Pulp & Paper Research Journal 33, no. 3 (2018): 448–59. http://dx.doi.org/10.1515/npprj-2018-3052.

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Abstract Increased wood softening and refining intensity have earlier been utilized to improve refining efficiency in mechanical pulping. We have evaluated a combination of increased softening by low dose sulphite chip pretreatment and increased intensity by feeding segment design in a TMP line for production of high quality printing papers. Norway spruce wood chips were preheated, compressed in an Impressafiner and impregnated with water or sodium sulphite solutions (Na2SO3 charges 3.6 and 7.2 kg/t). Chips were refined in two parallel 68” double disc refiners using two different refining cond

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Karlström, Anders, and Jan Hill. "Control strategies for refiners Part II: Consistency control in twin-disc refining zones using temperature profile information." Nordic Pulp & Paper Research Journal 33, no. 1 (2018): 44–57. http://dx.doi.org/10.1515/npprj-2018-3008.

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Abstract Consistency profiles in the refining zones of twin-disc refiners have always been cumbersome to estimate with good accuracy. To overcome such challenges, this paper shows that it is vital to measure temperature profiles between the refining discs to estimate uneven chip/pulp feed distribution. It is also shown that the plate clearance, measured by plate gap measurement devices, is changed dramatically when changing the amount of dilution water to the refining zones asymmetrically. At the same time, the inlet temperature will change as well while the maximum temperature is rather stabl

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Gerhard, Ortwin. "The barred inner Milky Way: dynamical models from surveys." Proceedings of the International Astronomical Union 13, S334 (2017): 73–81. http://dx.doi.org/10.1017/s1743921317007384.

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AbstractThe Milky Way is a barred galaxy whose central bulge has a box/peanut shape and consists of multiple stellar populations with different orbit distributions. This review describes dynamical and chemo-dynamical equilibrium models for the Bulge, Bar, and inner Disk based on recent survey data. Some of the highlighted results include (i) stellar mass determinations for the different Galactic components, (ii) the need for a core in the dark matter distribution, (iii) a revised pattern speed putting corotation at ~6 kpc, (iv) the strongly barred distribution of the metal-rich stars, and (v)

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Kavallaris, Nikos I., and Philippe Souplet. "Grow-Up Rate and Refined Asymptotics for a Two-Dimensional Patlak–Keller–Segel Model in a Disk." SIAM Journal on Mathematical Analysis 40, no. 5 (2009): 1852–81. http://dx.doi.org/10.1137/080722229.

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Ashida, Maki, Takashi Hamachiyo, Kazuhiro Hasezaki, Hirotaka Matsunoshita, Masaaki Kai, and Z. Horita. "Control of Crystallographic Orientation and Grain Refinement in Bi₂Te₃-Based Thermoelectric Semiconductors by Applying High Pressure Torsion." Materials Science Forum 584-586 (June 2008): 1006–11. http://dx.doi.org/10.4028/www.scientific.net/msf.584-586.1006.

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Prepared were p-type Bi2Te3-based thermoelectric semiconductors, having a grain-refined microstructure and a preferred orientation of anisotropic crystallographic structure. Disks with a nominal composition Bi0.5Sb1.5Te3.0 were cut from an ingot grown by the vertical Bridgman method (VBM) and deformed at 473 K under a pressure of 6.0 GPa by high pressure torsion (HPT). The crystal orientation was characterized with X-ray diffraction. The microstructures were characterized by using optical microscopy and scanning electron microscopy. It was found that the HPT disks had a fine and preferentially

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Tomashevskiy, S. B. "Simulation of vehicle tires based on the finite element method." Izvestia MGTU MAMI 1, no. 3 (2020): 65–74. http://dx.doi.org/10.31992/2074-0530-2020-45-3-65-74.

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Modeling of wheeled vehicles is one of the main directions of development and practical appli-cation of software systems based on modeling the dynamics of body systems. In this paper, a tech-nique for analyzing a vehicle tire by the finite element method under various types of loading is considered in order to identify the parameters of its simplified dynamic models. Based on the finite element method, a refined tire model is created. It takes into account the complex geometric shape of various tire parts, their material properties, as well as the contact interaction of the tire with the suppo

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