Demands are increasing for micro axis-symmetric aspherical lenses to be installed in various optical devices. The micro glass lenses are generally molded by glass press process with micro aspheric ceramic molding dies or molds made of tungsten carbide or silicon carbide. These dies and molds are mostly ground with micro diamond wheels, but require additional finishing process as the size of the...

Background and Aim: This study aimed to assess the effect of finishing and polishing time, technique and surface coating on microleakage of encapsulated restorative resin modified glass ionomer (RMGI). Materials and Methods: In this in vitro study, 40 freshly extracted human premolars were selected. Two standard class V cavities were prepared on the buccal and lingual surfaces of each tooth. T...

This paper reports a new method for making multi-layer substrates (h4LS) for high aspect ratio single crystalline movable microstructures using a group of technologies, such as direct wafer bonding (DWJ3) , chemical mechanical polishing (CMP) , and reactive ion etching (RIE) . As a first example, Si-SiO,-polySi-SiO,-Si sandwich wafers were fabricated using CMP and DWB. Subsequently, free-standi...

We present a novel simulation technique that offers efficient mass fabrication strategies for 2m class hexagonal mirror segments of extremely large telescopes. As the first of two studies in series, we establish the theoretical basis of the tool influence function (TIF) for precessing tool polishing simulation for non-rotating workpieces. These theoretical TIFs were then used to confirm the rep...

2 Silicon carbide (SiC) single crystals, along with sapphire and silicon, are one of most important substrates for high-brightness LED fabrications. Owing to extremely high hardness (Mohs’ scale of 9.5) and chemical inertness, the polishing rate of SiC with conventional chemical mechanical polishing (CMP) methods is not high, and surface scratches are also inevitable because of using slurry con...

The purpose of this study was to investigate the influence of the surface roughness of denture base resin and metal on wettability with water and saliva. Solid specimens were produced using heat-curing denture base resin and Co-Cr alloy. After polymerizing or casting these materials, specimens with four different types of surface roughness were produced by a progressive polishing process using ...

This paper reports a new method for making high aspect ratio Single Crystalline Silicon (SCS) microstructures om multi layer substrates using Chemical Mechanical Polishing (CMP), Silicon Fusion Bonding (SFB) and Reactive Ion Etching (NE) techniques. First Si-Si02-PolySi-Si02-Si sandwich wafers were fabricated using CMP and SFB. Then microstructures were fabricated on these sandwich wafers using...

Chemical vapour deposition (CVD) grown boron-doped nanocrystalline diamond (B-NCD) is an attractive material for the fabrication of high frequency superconducting nanoelectromechanical systems (NEMS) due to its high Young's modulus. The as-grown films have a surface roughness that increases with film thickness due to the columnar growth mechanism. To reduce intrinsic losses in B-NCD NEMS it is ...

Present work aims at multi-mechanical surface treatment of Ti-6Al-4V based-miniplate implant manufactured by electrical discharge machining (EDM) for biomedical use. Mechanical surface treatment consists of consequent use of ultrasonic cleaning, rotary tumbler polishing, and brushing. Surface layers are analyzed employing scanning electron microscopy and energy dispersive X-ray spectroscopy. Al...

Every single false positive that an automated design flaw detection tool presents to a developer places a cognitive burden on him and should thus be avoided. A preliminary yet already quite comprehensive catalog of false positives was recently presented in [1]. We elaborated in [5, 4] that developers accept design flaws in the context of specific design ideas, e.g. feature envy in the context o...