Damage to tooth root surfaces may occur during ultrasonic cleaning with both piezoelectric and magnetostrictive ultrasonic scalers. It is unclear which mechanism causes more damage or how their mechanism of action leads to such damage. Our null hypothesis is that tooth-surface defect dimensions, resulting from instrumentation with ultrasonic scalers, are independent of whether the scaler probe ...

The theoretical basis is developed for a technique to fabricate nonaxisymmetric mirrors. Stresses are applied to a mirror blank that would have the effect of elastically deforming a desired surface into a sphere. A sphere is then polished into the blank, and upon release of the applied stress, the spherical surface deforms into the desired one. The method can be applied iteratively, so arbitrar...

Plagioclase feldspar, clinopyroxene, and ilmenite in a polished thin section of a type A crystalline rock were analyzed. The clinopyroxene grains are compositionally variable, and both high Ca and low Ca phases are present. The plagioclase is compositionally homogeneous. The ilmenite is chemically homogeneous except for occasional, small areas of high local chromium concentration. Accessory min...

An analysis of electrical-discharge machined AISI D2 tool steel for high-cycle fatigue is conducted. The damage model was developed to reveal the in£uence of different electrical-discharge machining conditions on the fatigue life. The processed surface layer and the cross-section were examined by scanning electron microscopy (SEM).The experimental results show that the fatigue life of the EDMed...

Abstract. Automatic identification of minerals in images polished section is highly demanded exploratory geology as it can provide a significant reduction time spent the study ores and eliminate factor misdiagnosis minerals. The development algorithms for automatic analysis sections makes possible to create universal tool comparing from different deposits, which also much demand. main contribut...

The study of a well-preserved crucible fragment from the Middle Kingdom Egyptian fortress in Buhen lower Nubia revealed unexpected presence numerous prills very arsenic- and nickel-rich copper alloy what looks like smelting slag. Based on optical scanning electron microscopy polished section, this paper discusses potential metallurgical process that was carried out type crucible. Strongly reduc...

Tomographic reconstruction of a wide range of materials and biological samples can be accomplished via serial-section broad-ion-beam tomography (SSBIB) – alternately ion-polishing away material and imaging the remaining polished surface with optical or scanning electron microscopy (SEM) [1]. Under computer control it is practical to acquire 2-D images of hundreds of sections without user interv...

The McLymont property is located close to the headwaters of McLymont Creek, a tributary of the lskut River; it lies at an elevation of approximately I I70 metres (3800 feet), about 2 kilometres southwest of Newmont Lake (Figure 2-l I-l) The property is currently being explored by Gulf International Minerals Ltd. It contains two styles of mineralization whose relationship to each other is uncert...

2.1 Fiber Endface Conditions Required for PC Connection Figure 1 shows the structure of an 8-fiber MPO connector. To decrease reflection, fiber endfaces in this kind of connector are polished at a gradient of 8° to the fiber cross section. The connector endfaces are held together by the engagement of the guide pins in guide-pin holes. To achieve PC connection in such a connector, it is necessar...

Metal particles in Guarena (H6), Colby (L6) and St. Severin (LL6) were studied by optical microscopy and by electron microprobe analysis. Observations from successive polished sections through the metal particles show that kamacite and taenite grains, which often appear to be isolated particles, are connected directly or by intervening sulfides. Also tetrataenite rims are widest when adjacent t...