Compressional wave velocities (Vp) in quartz aggregate were measured to quantify the effect of pore fluid (H2O) on Vp at high pressure-temperature (P-T). Ultrasonic measurements were conducted on dry and wet quartz aggregate from room temperature to 500°C at 0.5 GPa using a piston cylinder apparatus. The experiment showed a 4% decrease in measured Vp in quartz aggregate with increasing H2O cont...

The morphology of copper films grown on quartz, mica, and Ti/quartz has been investigated by means of scanning tunneling microscopy (STM). Films grown on quartz, both bare and pre-plated with titanium, are characterized by self-affine fractal scaling behavior over the length scale of 10 ̈500 nm, while films grown on mica are not. Annealing of the films to 340 -C reduces the root-mean-square (RMS...

It is meaningful to study the surface morphology of monocrystalline material, but there are few studies on the surface roughness of quartz. So, surface roughness of Z-cut quartz etched by pure ammonium bifluoride and ammonium bifluoride mixed with isopropyl alcohol (IPA) solution was investigated for the first time in this paper. Firstly, when etching in pure ammonium bifluoride solutions, the ...

Note: This document specifies the updated final version of the Quartz signature scheme, slightly modified as allowed in the second stage of Nessie evaluation process, in order to improve the speed and the security. In some papers that refer to the old version, it is sometimes called Quartz, and Quartz is the new version. This is therefore the only official version of Quartz. We note that the ke...

Petrography and physicomechanical properties of alkali granites, alkali quartz syenite, and nepheline syenite from Ambela, NW Pakistan, have been investigated. Whereas the alkali quartz syenite and most of the alkali granites are megaporphyritic, the nepheline syenite and some of the alkali granites are microporphyritic. Their phenocryst shape and size and abundance of groundmass are also diffe...

The influence of quartz plate roughening on the dynamic parameters of quartz resonators has been studied. For this aim AT-cut quartz plates with a diameter of 8 mm, after a standard technological cleaning, are subjected to treatment with abrasive of varying grain sizes: 3, 7, 14 and 20 μm. Piezoquartz resonators are fabricated on these plates with 4 mm Au electrodes. The alterations of resonato...

the present study investigates the crystal preferred orientation (cpo) of quartz crystals in psammitic rocks to ascertain the deformationmechanism using electron backscatter diffraction (ebsd) on quartz crystals from north of the renvyle-bofin slide (rbs) nearletterfrack in western ireland. complete crystallographic orientations were determined for several thousand individual quartz crystalsin ...

The novel application of a piezoelectric quartz resonator for the detection trapped ions has developed in observation quartz-ions interaction under non-equilibrium conditions, opening new perspectives high-sensitive motional frequency measurements radioactive particles. Energized crystals have (long) constant-decay times order milliseconds, permitting coherent charged particles within short tim...

Shallow water sedimentary units are generally considered scarce in Archean greenstone belts. We describe an unusual quartz arenite-subaerial andesite association within the Archean Hisovaara greenstone belt, a fragment of the Parandovo-Tikshozero belt within the Karelian craton of the Baltic Shield. The Hisovaara greenstone belt consists of several lithotectonic assemblages: (1) a komatiite-tho...