LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 55

Search options

  1. Article: Solar wind stream interaction regions throughout the heliosphere.

    Richardson, Ian G

    Living reviews in solar physics

    2018  Volume 15, Issue 1, Page(s) 1

    Abstract: This paper focuses on the interactions between the fast solar wind from coronal holes and the intervening slower solar wind, leading to the creation of stream interaction regions that corotate with the Sun and may persist for many solar rotations. Stream ...

    Abstract This paper focuses on the interactions between the fast solar wind from coronal holes and the intervening slower solar wind, leading to the creation of stream interaction regions that corotate with the Sun and may persist for many solar rotations. Stream interaction regions have been observed near 1 AU, in the inner heliosphere (at
    Language English
    Publishing date 2018-01-26
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2163184-0
    ISSN 1614-4961
    ISSN 1614-4961
    DOI 10.1007/s41116-017-0011-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  2. Article: Microstructure Study of Pulsed Laser Beam Welded Oxide Dispersion-Strengthened (ODS) Eurofer Steel.

    Fu, Jia / Richardson, Ian / Hermans, Marcel

    Micromachines

    2021  Volume 12, Issue 6

    Abstract: Oxide dispersion-strengthened (ODS) Eurofer steel was laser welded using a short pulse duration and a designed pattern to minimise local heat accumulation. With a laser power of 2500 W and a duration of more than 3 ms, a full penetration can be obtained ... ...

    Abstract Oxide dispersion-strengthened (ODS) Eurofer steel was laser welded using a short pulse duration and a designed pattern to minimise local heat accumulation. With a laser power of 2500 W and a duration of more than 3 ms, a full penetration can be obtained in a 1 mm thick plate. Material loss was observed in the fusion zone due to metal vaporisation, which can be fully compensated by the use of filler material. The solidified fusion zone consists of an elongated dual phase microstructure with a bimodal grain size distribution. Nano-oxide particles were found to be dispersed in the steel. Electron backscattered diffraction (EBSD) analysis shows that the microstructure of the heat-treated joint is recovered with substantially unaltered grain size and lower misorientations in different regions. The experimental results indicate that joints with fine grains and dispersed nano-oxide particles can be achieved via pulsed laser beam welding using filler material and post heat treatment.
    Language English
    Publishing date 2021-05-28
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2620864-7
    ISSN 2072-666X
    ISSN 2072-666X
    DOI 10.3390/mi12060629
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  3. Article ; Online: Model structures for C-(A)-S-H(I).

    Richardson, Ian G

    Acta crystallographica Section B, Structural science, crystal engineering and materials

    2014  Volume 70, Issue Pt 6, Page(s) 903–923

    Abstract: C-(A)-S-H(I) is a calcium silicate hydrate that is studied extensively as a model for the main binding phase in concrete. It is a structurally imperfect form of 14 Å tobermorite that has variable composition and length of (alumino)silicate anions. New ... ...

    Abstract C-(A)-S-H(I) is a calcium silicate hydrate that is studied extensively as a model for the main binding phase in concrete. It is a structurally imperfect form of 14 Å tobermorite that has variable composition and length of (alumino)silicate anions. New structural-chemical formulae are presented for single- and double-chain tobermorite-based phases and equations are provided that can be used to calculate a number of useful quantities from (29)Si NMR data. It is shown that there are no interlayer calcium ions when the silicate chains are of infinite length and that one is added for each tetrahedral `bridging' site that is vacant. Preparations that have Ca/Si greater than about 1.4 include an intermixed Ca-rich phase. It is not possible to generate a structural model for a dimer that is crystal-chemically consistent with known calcium silicate hydrates if the starting structure is an orthotobermorite, i.e. of the type that has been used in all previous studies. Crystal-chemically plausible models are developed that are based instead on clinotobermorite. A number of models that represent different mean chain lengths are developed using crystal-chemical and geometrical reasoning. The models account for experimental observations, including variations in Ca/Si, H2O/Si, (alumino)silicate anion structure and layer spacing.
    Language English
    Publishing date 2014-12
    Publishing country England
    Document type Journal Article
    ZDB-ID 2020841-8
    ISSN 2052-5206 ; 1600-5740 ; 2052-5192 ; 0108-7681
    ISSN (online) 2052-5206 ; 1600-5740
    ISSN 2052-5192 ; 0108-7681
    DOI 10.1107/S2052520614021982
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  4. Article ; Online: Zn- and Co-based layered double hydroxides: prediction of the a parameter from the fraction of trivalent cations and vice versa.

    Richardson, Ian G

    Acta crystallographica Section B, Structural science, crystal engineering and materials

    2013  Volume 69, Issue Pt 4, Page(s) 414–417

    Abstract: A recently proposed method to calculate the a parameter of the unit cell of layered double hydroxides from the fraction of trivalent cations is extended to Zn- and Co-based phases. It is shown to be useful as a sanity test for extant and future structure ...

    Abstract A recently proposed method to calculate the a parameter of the unit cell of layered double hydroxides from the fraction of trivalent cations is extended to Zn- and Co-based phases. It is shown to be useful as a sanity test for extant and future structure determinations and computer-simulation studies.
    MeSH term(s) Cations/chemistry ; Cobalt/chemistry ; Hydroxides/chemistry ; Molecular Dynamics Simulation ; Zinc/chemistry
    Chemical Substances Cations ; Hydroxides ; Cobalt (3G0H8C9362) ; Zinc (J41CSQ7QDS)
    Language English
    Publishing date 2013-07-18
    Publishing country England
    Document type Journal Article
    ZDB-ID 2020841-8
    ISSN 2052-5206 ; 1600-5740 ; 1600-8650 ; 2052-5192
    ISSN (online) 2052-5206 ; 1600-5740 ; 1600-8650
    ISSN 2052-5192
    DOI 10.1107/S2052519213017545
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  5. Article ; Online: The importance of proper crystal-chemical and geometrical reasoning demonstrated using layered single and double hydroxides.

    Richardson, Ian G

    Acta crystallographica Section B, Structural science, crystal engineering and materials

    2013  Volume 69, Issue Pt 2, Page(s) 150–162

    Abstract: Atomistic modelling techniques and Rietveld refinement of X-ray powder diffraction data are widely used but often result in crystal structures that are not realistic, presumably because the authors neglect to check the crystal-chemical plausibility of ... ...

    Abstract Atomistic modelling techniques and Rietveld refinement of X-ray powder diffraction data are widely used but often result in crystal structures that are not realistic, presumably because the authors neglect to check the crystal-chemical plausibility of their structure. The purpose of this paper is to reinforce the importance and utility of proper crystal-chemical and geometrical reasoning in structural studies. It is achieved by using such reasoning to generate new yet fundamental information about layered double hydroxides (LDH), a large, much-studied family of compounds. LDH phases are derived from layered single hydroxides by the substitution of a fraction (x) of the divalent cations by trivalent. Equations are derived that enable calculation of x from the a parameter of the unit cell and vice versa, which can be expected to be of widespread utility as a sanity test for extant and future structure determinations and computer simulation studies. The phase at x = 0 is shown to be an α form of divalent metal hydroxide rather than the β polymorph. Crystal-chemically sensible model structures are provided for β-Zn(OH)2 and Ni- and Mg-based carbonate LDH phases that have any trivalent cation and any value of x, including x = 0 [i.e. for α-M(OH)2·mH2O phases].
    Language English
    Publishing date 2013-02-26
    Publishing country England
    Document type Journal Article
    ZDB-ID 2020841-8
    ISSN 2052-5206 ; 1600-5740 ; 1600-8650 ; 2052-5192
    ISSN (online) 2052-5206 ; 1600-5740 ; 1600-8650
    ISSN 2052-5192
    DOI 10.1107/S205251921300376X
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  6. Article ; Online: Clarification of possible ordered distributions of trivalent cations in layered double hydroxides and an explanation for the observed variation in the lower solid-solution limit.

    Richardson, Ian G

    Acta crystallographica Section B, Structural science, crystal engineering and materials

    2013  Volume 69, Issue Pt 6, Page(s) 629–633

    Abstract: The sequence of hexagonal ordered distributions of trivalent cations that are possible in the octahedral layer of layered double hydroxides is clarified, including the link between the composition and the supercell a parameter. A plausible explanation is ...

    Abstract The sequence of hexagonal ordered distributions of trivalent cations that are possible in the octahedral layer of layered double hydroxides is clarified, including the link between the composition and the supercell a parameter. A plausible explanation is provided for the observed variation in the lower solid-solution limit.
    Language English
    Publishing date 2013-11-18
    Publishing country England
    Document type Journal Article
    ZDB-ID 2020841-8
    ISSN 2052-5206 ; 1600-5740 ; 1600-8650 ; 2052-5192
    ISSN (online) 2052-5206 ; 1600-5740 ; 1600-8650
    ISSN 2052-5192
    DOI 10.1107/S2052519213027905
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  7. Article ; Online: Geomagnetic activity during the rising phase of solar cycle 24

    Richardson Ian G.

    Journal of Space Weather and Space Climate , Vol 3, p A

    2013  Volume 08

    Abstract: As previous studies have shown, geomagnetic activity during the solar minimum following solar cycle 23 was at low levels unprecedented during the space era, and even since the beginning of the Kp index in 1932. Here, we summarize the characteristics of ... ...

    Abstract As previous studies have shown, geomagnetic activity during the solar minimum following solar cycle 23 was at low levels unprecedented during the space era, and even since the beginning of the Kp index in 1932. Here, we summarize the characteristics of geomagnetic activity during the first 4 years of cycle 24 following smoothed sunspot minimum in December, 2008, and compare these with those of similar periods during earlier cycles going back to the start of Kp (cycles 17–23). The most outstanding feature is the continuing low levels of geomagnetic activity that are well below those observed during the rising phases of the other cycles studied. Even 4 years into cycle 24, geomagnetic storm rates are still only comparable to or below the rates observed during activity minima in previous cycles. We note that the storm rate during the rising phases of cycles 17–23 was correlated with the peak sunspot number (SSN) in the cycle. Extrapolating these results to the low storm rates in cycle 24 suggests values of the peak SSN in cycle 24 that are consistent with the NOAA Space Weather Prediction Center prediction of 90 ± 10, indicating that cycle 24 is likely to be the weakest cycle since at least 1932. No severe (Dst < −200 nT) storms have been observed during the first 4 years of cycle 24 compared with 4 in the comparable interval of cycle 23, and only 10 intense (Dst < −100 nT) storms, compared with 21 in cycle 23. These storms were all associated with the passage of Interplanetary Coronal Mass Ejections (ICMEs) and/or their associated sheaths. The lack of strong southward magnetic fields in ICMEs and their sheaths, their lower speeds close to the average solar wind speed, a ~20% reduction in the number of ICMEs passing the Earth, and weaker than normal fields in corotating high-speed streams, contribute to the low levels of geomagnetic storm activity in the rise phase of cycle 24. However, the observation of an ICME with strong southward fields at the STEREO A spacecraft on July 24, 2012, which would have been highly geoeffective had it encountered the Earth, demonstrates that strong geomagnetic storms may still occur during weak solar cycles.
    Keywords interplanetary coronal mass ejection (CME) ; Solar cycle ; stream ; Solar activity ; interplanetary medium ; Geophysics. Cosmic physics ; QC801-809 ; Physics ; QC1-999 ; Science ; Q ; DOAJ:Geophysics and Geomagnetism ; DOAJ:Earth and Environmental Sciences
    Subject code 550
    Language English
    Publishing date 2013-03-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  8. Article ; Online: Football in the community.

    Plant, Nigel / Richardson, Ian / Pringle, Alan

    Perspectives in public health

    2019  Volume 139, Issue 3, Page(s) 121–122

    MeSH term(s) Community-Institutional Relations ; Mental Health ; Soccer ; United Kingdom
    Language English
    Publishing date 2019-05-10
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2478358-4
    ISSN 1757-9147 ; 1757-9139
    ISSN (online) 1757-9147
    ISSN 1757-9139
    DOI 10.1177/1757913919838766
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    In stock of ZB MED Cologne/Königswinter

    Zs.B 423: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
    ab Jg. 2022: Lesesaal (EG)

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  9. Book ; Conference proceedings: Poultry meat science

    Richardson, R. I.

    [25th Poultry Science Symposium held at the University of Bristol, 17 - 19 September, 1997]

    (Poultry science symposium series ; 25)

    1999  

    Event/congress Poultry Science Symposium (25, 1997, Bristol)
    Author's details ed. by R. I. Richardson
    Series title Poultry science symposium series ; 25
    Collection
    Keywords Geflügelfleisch
    Language English
    Size XI, 444 S. : Ill., graph. Darst.
    Publisher CABI Publ
    Publishing place Wallingford u.a.
    Publishing country Great Britain
    Document type Book ; Conference proceedings
    HBZ-ID HT010736228
    ISBN 0-85199-237-4 ; 978-0-85199-237-2
    Database Catalogue ZB MED Nutrition, Environment, Agriculture

    More links

    Kategorien

    In stock of ZB MED Bonn / Germany

    Shelf markLoan statusLocation
    998/1669 available for loan (reading room) Freihandmagazin (U1)

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  10. Article: The Effect of Groove Shape on Molten Metal Flow Behaviour in Gas Metal Arc Welding.

    Ebrahimi, Amin / Babu, Aravind / Kleijn, Chris R / Hermans, Marcel J M / Richardson, Ian M

    Materials (Basel, Switzerland)

    2021  Volume 14, Issue 23

    Abstract: One of the challenges for development, qualification and optimisation of arc welding processes lies in characterising the complex melt-pool behaviour which exhibits highly non-linear responses to variations of process parameters. The present work ... ...

    Abstract One of the challenges for development, qualification and optimisation of arc welding processes lies in characterising the complex melt-pool behaviour which exhibits highly non-linear responses to variations of process parameters. The present work presents a computational model to describe the melt-pool behaviour in root-pass gas metal arc welding (GMAW). Three-dimensional numerical simulations have been performed using an enhanced physics-based computational model to unravel the effect of groove shape on complex unsteady heat and fluid flow in GMAW. The influence of surface deformations on the magnitude and distribution of the heat input and the forces applied to the molten material were taken into account. Utilising this model, the complex thermal and fluid flow fields in melt pools were visualised and described for different groove shapes. Additionally, experiments were performed to validate the numerical predictions and the robustness of the present computational model is demonstrated. The model can be used to explore the physical effects of governing fluid flow and melt-pool stability during gas metal arc root welding.
    Language English
    Publishing date 2021-12-04
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma14237444
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

To top