From slow to ultra-slow: How does spreading rate affect seafloor roughness and crustal thickness?

Geology ◽  
2011 ◽  
Vol 39 (10) ◽  
pp. 911-914 ◽  
Author(s):  
Daniel Sauter ◽  
Heather Sloan ◽  
Mathilde Cannat ◽  
John Goff ◽  
Philippe Patriat ◽  
...  
Keyword(s):  
Crustal Thickness ◽  
Spreading Rate

Oceanic crustal thickness versus spreading rate

1992 ◽  
Vol 19 (8) ◽  
pp. 753-756 ◽  
Author(s):  
Yongshun John Chen
Keyword(s):  
Crustal Thickness ◽  
Spreading Rate

Electrical imaging of the Mohns Ridge in the Greenland Sea

2020 ◽  
Author(s):  
Ståle Johansen ◽  
Martin Panzner ◽  
Rune Mittet ◽  
Hans Amundsen ◽  
Anna Lim ◽  
...  
Keyword(s):  
Joint Inversion ◽  
Crustal Thickness ◽  
Spreading Rate ◽  
High Porosity ◽  
Mantle Upwelling ◽  
Magnetotelluric Data ◽  
Electrical Imaging ◽  
Plumbing Systems ◽  
Fluid Convection ◽  
Thin Crust

<p>A detailed 120 km deep electromagnetic joint inversion model for the ultra-slow Mohns Ridge was constructed combining controlled source- and magnetotelluric data. About one third of mid-ocean ridges have a spreading rate less than 20 mm/yr<sup>1</sup>, but due to lack of deep imaging, factors controlling melting and mantle upwelling, depth to the lithosphere – asthenosphere boundary (LAB), crustal thickness and hydrothermal venting are not well understood for this class of ridges. Modern electromagnetic data have significantly improved understanding of fast-spreading ridges, but have not been available for the ultra-slow ridges. The new inversion images show mantle upwelling focused along a narrow, oblique and strongly asymmetric zone coinciding with asymmetric surface uplift. Though the upwelling pattern shows several of the characteristics of a dynamic system, instead it likely reflects passive upwelling controlled by slow and asymmetric plate movements.</p><p>Upwelling asthenosphere and melt are enveloped by the 100 Ωm contour denoted the electrical LAB (eLAB). This transition may represent a rheological boundary defined by a minimum melt content. We also find that a model where crustal thickness is directly controlled by the melt-producing rock volumes created by the separating plates can explain the thin crust below the ridge. Fluid convection extends for long lateral distances exploiting high porosity at mid crustal levels. The magnitude and long-lived nature of such plumbing systems could promote venting at ultra-slow ridges. Further, active melt emplacement into ca 3 km thick oceanic crust culminates in an inferred crustal magma chamber draped by fluid convection cells emanating at Loki´s Castle hydrothermal field.</p>

SIFAT FISIK KAYU LAPIS BERBAHAN BAKU KAYU AKASIA (Acacia mangium Willd) DAN KELAMPAYAN (Anthocephalu spp)

2011 ◽  
Vol 3 (2) ◽  
pp. 1 ◽  
Author(s):  
Effendi Arsad
Keyword(s):  
Tensile Strength ◽  
Water Content ◽  
Acacia Mangium ◽  
Spreading Rate ◽  
Wood Material

The utilization of acacia and kelampayan wood as  plywood materials  were done. There are two kinds of treatments with two cores samples.  Wood core with thickness 2 mm and 3 mm with the spreading rate of adhesive  150 gr/m2, 200 gr/m2 and 250 gr/m2.   Resuls showed  that the  water content  of plywood  are 9,01% - 14,29%  for acacia and 9,17% - 10,58%   for kelampayan wood material.  The density of the plywood are 0,62 gr/cm3 – 0,73 gr/cm3  for acacia and 0,44 gr/cm3 – 0,57 gr/cm3.  for kelampayan wood material.  The tensile  strength of plywood are tensile strength of  plywood  are 9,49 kg/cm2 – 14,73 kg/cm2  for acacia and 8,61 kg/cm2 – 12,58 kg/cm2   for kelampayan wood material.Keywords: acacia, kelampayan,  the spreading rate of adhesive,  physics       characteristic,  plywood

Role of Vasavaleha in the management of Covid19

2020 ◽  
Vol 11 (SPL1) ◽  
pp. 259-261
Author(s):  
Aamir Khan ◽  
Rajni K. Gurmule
Keyword(s):  
Immune System ◽  
Human Body ◽  
Respiratory Diseases ◽  
Spreading Rate ◽  
Host Immune System ◽  
Shortness Of Breath ◽  
Antitussive Effect ◽  
Corona Viruses ◽  
Very High

Vasavaleha is one of the best medicine given for respiratory diseases. Corona viruses typically affect the respiratory system, causing symptoms such as coughing, fever and shortness of breath. It also affects host immune system of human body. Spreading rate of this disease is very high. Whole world is seeking for the treatment which can uproots this diseases. There in no vaccine available till date against this pandemic disease. Ayurveda mainly focuses on prevention of diseases alongwith its total cure. Rajyakshma Vyadhi is MadhyamMarga Roga as per Ayurveda. It shows many symptoms such as Kasa, Shwasa etc. By overall view of Covid 19, shows its resemblance with Rajyakshma Vyadhi described in Ayurveda. Vasavaleha is a Kalpa which is described in Rogadhikara of Rajyakshma. It shows Kasahara, Shwashara properties. It consists of Vasa, Pipalli, Madhu and Goghrita. These components shows actions like bronchodilation, antitussive effect and many more other actions. Pipalli shows important Rasayana effect. So in present review, we have tried to focus on role of Vasavaleha in the management of Covid 19. This can be used as preventive as well as adjuvant medication in treating Covid 19. There is need of further clinical research to rule of exact action of Vasavaleha against Covid 19.

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