Structural and mechanical evolution of Tridacna gigas during permineralization

We present an experimental study combining particle tracking, active microrheology, and differential dynamic microscopy (DDM) to investigate the dynamics and rheology of an oil-water interface during biofilm formation by the...

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Microstructure and mechanical evolution of Ti-based bulk metallic glass induced by deformation and isothermal annealing in supercooled liquid region

Materials Letters ◽

10.1016/j.matlet.2021.131038 ◽

2021 ◽

pp. 131038

Author(s):

J.W. Lv ◽

C. Wei ◽

S. Zhang ◽

Z.L. Shi ◽

H.R. Zhang ◽

...

Keyword(s):

Metallic Glass ◽

Bulk Metallic Glass ◽

Isothermal Annealing ◽

Supercooled Liquid ◽

Supercooled Liquid Region ◽

Liquid Region ◽

Mechanical Evolution

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Electromagnetic Gauge Choice for Scattering of Schrödinger Particle

Annales Henri Poincaré ◽

10.1007/s00023-019-00850-y ◽

2019 ◽

Vol 20 (11) ◽

pp. 3633-3650

Author(s):

Andrzej Herdegen

Keyword(s):

Asymptotic Behavior ◽

External Electromagnetic Field ◽

Asymptotic Completeness ◽

Free Evolution ◽

Wave Operators ◽

Radiation Fields ◽

Mechanical Evolution ◽

Scattering Wave ◽

Free Fields

Abstract We consider a Schrödinger particle placed in an external electromagnetic field of the form typical for scattering settings in the field theory: $$F=F^\mathrm {ret}+F^\mathrm {in}=F^\mathrm {adv}+F^\mathrm {out}$$ F = F ret + F in = F adv + F out , where the current producing $$F^{\mathrm {ret}/\mathrm {adv}}$$ F ret / adv has the past and future asymptotes homogeneous of degree $$-3$$ - 3 , and the free fields $$F^{\mathrm {in}/\mathrm {out}}$$ F in / out are radiation fields produced by currents with similar asymptotic behavior. We show that with appropriate choice of electromagnetic gauge the particle has ‘in’ and ‘out’ states reached with no further modification of the asymptotic dynamics. We use a special quantum mechanical evolution ‘picture’ in which the free evolution operator has well-defined limits for $$t\rightarrow \pm \infty $$ t → ± ∞ , and thus the scattering wave operators do not need the free evolution counteraction. The existence of wave operators in this setting is established, but the proof of asymptotic completeness is not complete: more precise characterization of the asymptotic behavior of the particle for $$|\mathbf {x}|=|t|$$ | x | = | t | would be needed.

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A model for Archean tectonism. Part 2. Numerical models of vertical tectonism in greenstone belts

Canadian Journal of Earth Sciences ◽

10.1139/e80-006 ◽

1980 ◽

Vol 17 (1) ◽

pp. 60-71 ◽

Cited By ~ 62

Author(s):

Jean-Claude Mareschal ◽

Gordon F. West

Keyword(s):

Numerical Models ◽

Volcanic Eruptions ◽

Crustal Rocks ◽

Tectonic Model ◽

Mechanical Evolution ◽

Accumulated Strain ◽

Lava Sequence ◽

Order Of Magnitude ◽

Greenstone Belts ◽

Horizontal Temperature Gradients

A tectonic model that attempts to explain common features of Archean geology is investigated. The model supposes the accumulation, by volcanic eruptions, of a thick basaltic pile on a granitoid crust. The thermal blanketing effect of this lava raises the temperature of the granitic crust and eventually softens it enough that gravitational slumping and downfolding of the lava follows.Numerical models of the thermal and mechanical evolution of a granitoid crust covered with a thick lava sequence indicate that such an evolution is possible when reasonable assumptions are made about the temperature dependence of the viscosity in crustal rocks. These models show the lava sinking in relatively narrow regions while wider granite diapirs appear in between. The convection produces strong horizontal temperature gradients that may cause lateral changes in metamoprhic facies. A one order of magnitude drop in accumulated strain occurs between the granite–basalt interface and the center of the granite diaper at a depth of 10–15 km.

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KEPADATAN MEGABENTOS PADA EKOSISTEM TERUMBU KARANG DI PERAIRAN DESA PERLANG BANGKA TENGAH, BANGKA BELITUNG

Akuatik Jurnal Sumberdaya Perairan ◽

10.33019/akuatik.v13i2.1621 ◽

2019 ◽

Vol 13 (2) ◽

pp. 173-177

Author(s):

Arham Hafidh Akbar ◽

Sudirman Adibrata ◽

Wahyu Adi

Keyword(s):

Coral Reef ◽

Data Collection ◽

Coral Cover ◽

Live Coral ◽

Coral Reef Ecosystems ◽

Tridacna Maxima ◽

Belt Transect ◽

Tridacna Gigas ◽

Drupella Cornus ◽

Diadema Setosum

This study aims to analyze the density of megabenthos in coral reef ecosystems in the waters of Perlang Village. This research was conducted in November 2019 in the waters of Perlang Village with the megabentos data collection method using the Bentos Belt Transect (BBT) method based on COREMAP CTI LIPI (2017) with 5 data collection stations. The results found 603 individuals consisting of 9 species from 4 megabenthos families in coral reef ecosystems. Species found at the study site are Diadema setosum, Diadema antillarium (Familli Deadematidae), Drupella cornus, Drupella rugosa (Family Murcidae), Trochus sp, Trochus conus, Tectus pyramis (Family Trochidae), Tridacna gigas, and Tridacna maxima (Family Tridacnidae) . The highest attendance percentage of all stations was obtained by Diadema setosum of 47.93% (289 people). Percentage of live coral cover from 5 observation stations ranged from 57.44% - 91.78%. Observation pensions that received the highest percentage of cover values were at pension 2 with 91.78% in the very good category.

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