Arc Voltage Characteristics in Ultrahigh-Pressure Nitrogen Including Supercritical Region

<p>Transformation of squalene and its by-products in fingermarks over time under different storage conditions (light, dark and underwater) was examined through ultrahigh-pressure liquid chromatography high resolution accurate mass Orbitrap™ mass spectrometry. Complications of assessing fingermark compositional variation over time using multiple samples with varying initial compositions were elucidated and a more rational approach was successfully demonstrated. Squalene was detected in all fresh natural fingermarks and the amount ranged between 0.20 to 11.32 μg/5 fingertips. A notable difference in the transformation of squalene was observed with different storage conditions, where a dark aquatic environment accelerated degradation of squalene compared to dark but dry conditions. Squalene monohydroperoxide was extremely short-lived in natural deposits while the amount of squalene epoxide was still increasing relative to the initial amount, after ageing under dark and aquatic conditions for up to 7 days. Some oxidation by-products of cholesterol were also tentatively identified, which exhibited a growth over time against their initial concentration under any of the storage condition tested. These by-products, therefore, show potential as biomarkers for targeted visualisation of aged deposits.</p>

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Ultrahigh-Pressure Angioplasty versus the Peripheral Cutting Balloon™ for Treatment of Stenoses in Autogenous Fistulas: Comparison of Immediate Results

The Journal of Vascular Access ◽

10.5301/jva.2010.101 ◽

2010 ◽

Vol 11 (4) ◽

pp. 303-311 ◽

Cited By ~ 12

Author(s):

Sanjoy Kundu ◽

Rick Clemens ◽

Jonathan Aziza ◽

Paul Tam ◽

Gordon Nagai ◽

...

Keyword(s):

Ultrahigh Pressure ◽

Cutting Balloon

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The ultrahigh pressure stability of silver: An experimental and theoretical study

Journal of Applied Physics ◽

10.1063/5.0045374 ◽

2021 ◽

Vol 129 (12) ◽

pp. 125901

Author(s):

E. F. O’Bannon ◽

M. J. Lipp ◽

J. S. Smith ◽

Y. Meng ◽

P. Söderlind ◽

...

Keyword(s):

Theoretical Study ◽

Ultrahigh Pressure ◽

Pressure Stability

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Critical behavior of the 2d scalar theory: resumming the N8LO perturbative mass gap

Journal of High Energy Physics ◽

10.1007/jhep07(2021)163 ◽

2021 ◽

Vol 2021 (7) ◽

Author(s):

Gustavo O. Heymans ◽

Marcus Benghi Pinto

Keyword(s):

Perturbation Theory ◽

Critical Behavior ◽

State Of The Art ◽

Critical Coupling ◽

Scalar Theory ◽

Perturbative Series ◽

Supercritical Region ◽

Mass Gap ◽

Perturbative Result ◽

Symmetric Phase

Abstract We apply the optimized perturbation theory (OPT) to resum the perturbative series describing the mass gap of the bidimensional ϕ4 theory in the ℤ2 symmetric phase. Already at NLO (one loop) the method is capable of generating a quite reasonable non-perturbative result for the critical coupling. At order-g7 we obtain gc = 2.779(25) which compares very well with the state of the art N8LO result, gc = 2.807(34). As a novelty we investigate the supercritical region showing that it contains some useful complimentary information that can be used in extrapolations to arbitrarily high orders.

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Rheological Contrast between Quartz and Coesite Generates Strain Localization in Deeply Subducted Continental Crust

Minerals ◽

10.3390/min11080842 ◽

2021 ◽

Vol 11 (8) ◽

pp. 842

Author(s):

Kouhei Asano ◽

Katsuyoshi Michibayashi ◽

Tomohiro Takebayashi

Keyword(s):

Rheological Behavior ◽

Strain Localization ◽

Shear Zones ◽

Ultrahigh Pressure ◽

Ultramafic Rocks ◽

Crustal Material ◽

Orientation Data ◽

Crystallographic Preferred Orientation ◽

Dabie Shan ◽

Felsic Rocks

Deformation microstructures of peak metamorphic conditions in ultrahigh-pressure (UHP) metamorphic rocks constrain the rheological behavior of deeply subducted crustal material within a subduction channel. However, studies of such rocks are limited by the overprinting effects of retrograde metamorphism during exhumation. Here, we present the deformation microstructures and crystallographic-preferred orientation data of minerals in UHP rocks from the Dabie–Shan to study the rheological behavior of deeply subducted continental material under UHP conditions. The studied samples preserve deformation microstructures that formed under UHP conditions and can be distinguished into two types: high-strain mafic–ultramafic samples (eclogite and garnet-clinopyroxenite) and low-strain felsic samples (jadeite quartzite). This distinction suggests that felsic rocks are less strained than mafic–ultramafic rocks under UHP conditions. We argue that the phase transition from quartz to coesite in the felsic rocks may explain the microstructural differences between the studied mafic–ultramafic and felsic rock samples. The presence of coesite, which has a higher strength than quartz, may result in an increase in the bulk strength of felsic rocks, leading to strain localization in nearby mafic–ultramafic rocks. The formation of shear zones associated with strain localization under HP/UHP conditions can induce the detachment of subducted crustal material from subducting lithosphere, which is a prerequisite for the exhumation of UHP rocks. These findings suggest that coesite has an important influence on the rheological behavior of crustal material that is subducted to coesite-stable depths.

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