In this paper, we propose a new fabrication method of high concentration carbon nanotube (CNT) composite phenolic resin bond for grinding tools and investigate the molding conditions by solvent casting method. CNT/diamond with 12.5 vol% Ni-coated diamond grains 20 CNTs were prepared The novolac Hexamethylenetetramine as hardener was used in study. Partial curing occurs range 40°C–90°C harden completely at 180°C. proposed involves two steps: desolvation hot press molding. Methanol or butanol...

<div class="section abstract"><div class="htmlview paragraph">Improvement and evolution of all aircraft technologies the commercialization new are essential to carbon-net-zero goal air mobility. Passenger required provide ultimate in comfort, economy, safety, gas turbine engines will not disappear, while promoting conversion SAF hydrogen fuels. The More Electric Engine (or MEE) concept, which has been proposed since late 2000s, is one alternative. This paper focuses on...

We developed a safe technique without using toxic gas source to deposit tungsten oxide on localized specific area an atmospheric pressure microplasma jet. In this technique, consumable wire, inserted into quartz nozzle for generation, was etched with O 2 /Ar microplasma, and the resultant deposited substrate placed downstream. The process mechanism determined by detailed observation of consumed wire surface after processing, optical emission spectroscopy. This is expected be utilized...

Real-time coefficient of friction (COF) analysis was used to determine the extent normal and shear forces during chemical mechanical planarization (CMP) identify lubrication mechanism process. Experiments were done on a scaled polisher using IC-1000 pads with various surface textures, Fujimi's PL-4217 fumed silica slurry over wide range applied pressures relative pad-wafer velocities. Stribeck curves showed that pad texture dictated overall system. Average COF results yielded valuable...

A new line equalizer system for time compression burstmode digital suhscriber loop transmission that can equalize a with multiple bridged taps (BT's) is developed. Using the developed equalizer, up to 5 km (0.4 mmφ) length and four BT connections be equalized at data rate of 80 kbits/s in each direction. The composed variable gain <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">\surd{f}</tex> step equilizer, decision feedback automatic newly...

The effect of carbon nanotube (CNT) size on the wear properties Cu-based CNT composite electrode in electrical discharge machining (EDM) was studied. electrodes were fabricated by electroplating using a copper sulfate plating bath containing three kinds CNTs. EDM performed stainless steel to evaluate electrodes. Single pulse craters generated surface. ratios decreased 50-72% relation those electrolytic Cu resistance dependent size. It increased as length and thickness CNTs increased....

This study investigates the development of an ultrasonic vibration-assisted magnetic compound fluid (MCF) polishing technology for final polishing. The fabrication experimental apparatus entails unit, and investigation its performance in surface is described. In addition, MCF under different applied methods vibration studied. results indicate that applying to workpiece improves roughness material removal rate when vibrations are changed. across range conditions employed this study, precision...

Abstract We propose a piezoelectric transformer comprising two identical bolt-clamped Langevin-type transducers (BLTs) and stepped horn for its applications to high-power electronics. The can realize specified step-up voltage transformation ratio determined by the cross-sectional area of horn, both ends which are connected BLTs, at driving frequency in vicinity mechanical resonance frequency. In experiments, we obtained results predicted finite-element analysis. deviations measured...

A second generation LSI codec has been implemented. In this chip, switched-capacitor filters, a charge redistribution encoder and decoder, voltage references, signaling logic circuit, all necessary functions for voice-PCM conversion are integrated. The authors describe the summarizes its characteristics.

The wear properties of the Cu-based electrodes in micro-electrical discharge machining (EDM) were improved by codepositing CNTs into Cu matrix.Cu-based CNT fabricated electroplating using a copper sulfate plating bath containing CNTs.The surface roughness, and dispersion matrix applying ultrasonic vibration to during plating.The mass fraction increased with concentration above 1.0 g/L mean rate composite was approximately 50 % that normal electrode.The size craters, which formed each...

Previous researches have confirmed that MCF (magnetic compound fluid) slurry shows outstanding performance in the nanoprecision polishing of flat surfaces and V-grooves. However, no investigations been conducted on aspheric using slurry. In this work, a novel method employing doughnut-shaped tool 6-DOF manipulator has proposed for surface polishing. The time consumption forming stable its final appearance are investigated. Flat aluminum alloy workpieces can be considered as kind elements...

The authors describe the design concept and experimental results for a CMOS switched-capacitor variable-line equalizer to be used in time-compression multiplexed (TCM) digital subscriber loop transmission systems. transfer function is optimized time domain relax filter complexity half that required by application of classical communication techniques. In order equalize wide-bandwidth high-speed data, 50 MHz operational amplifier proposed. uses folded cascade buffer structure achieve good...

Single crystalline diamond grains covered by nested carbon nanotubes (CNTs) were constructed using self-assembly techniques. The acid-treated CNTs (MWCNTs-COOH) are first adsorbed onto amine-terminated grains, which chemically functionalized silane coupling treatments, in N, N-dimethylformamide solution. Then, the drying and readsorption cycle deposited CNT coatings on due to CNT-CNT interactions caused van der Waals forces. When bonded steel substrates electroplating nickel sulfamate...

New coating methods were proposed to improve the adherence strength between diamond grains and electrolytic nickel bonds on electroplating tools. Diamond covered by nested carbon nanotubes (CNTs) constructed using self-assembly techniques. The first amino-functionalized silane coupling or photochemical UV treatment. Acid-treated CNTs adsorbed automatically onto amino-terminated in N,N-dimethylformamide (DMF) solution amino-CNT interactions. Subsequent drying readsorption deposited CNT...

The objective of this study is to achieve a high-precision and high-efficiency machining process for industrial components the polyether ether ketone (PEEK) resin, such as inspection socket connector or semiconductor packages. However, drilling holes in PEEK resin challenging. Because thermoplastic it can soften melt owing heat generated during processing, which causes burrs degrades accuracy machined hole, thereby resulting quality deterioration hindering post-processing. Since thermal...

The Vickers hardness of Ni-based coatings was improved by codepositing carbon nanotubes (CNTs) as reinforcements in the nickel matrix and over 500 HV at room temperature. purpose this study to reveal high temperature range. normal CNT composite were formed ultrasonic assisted electroplating using a horn sonicator. Nickel sulfamate plating bath adding 1.6 g/L CNTs which 9.5nm diameter 1.5 μm average length used for depositing coating. At temperature, about three times that coatings. However,...

The atmospheric microplasma metal organic chemical vapor deposition (AP-MOCVD) using titanium (IV) tetraisopropoxide (TTIP) as a alkoxide source was investigated for depositing TiC and TiN hard coatings on stainless steel rods improving the tool life of electroplated diamond tools. components morphology coating deposited by AP-MOCVD with several gas sources different processes observed analyzed. titanium-based composed TiC, TiN, TiO2 successfully obtained TTIP mixed gases (CH 4 , N 2 H Ar)....

The development of nickel mold materials that softened at high temperatures was investigated, and their use in the fabrication replica molds by thermal nanoimprinting demonstrated. Ni-based carbon nanotube (CNT) composite coatings were formed ultrasonic assisted electroplating using a horn sonicator. 1.6 g/L CNTs, which 9.5 nm diameter 1.5 μm average length, added to sulfamate plating bath. Vickers hardness CNT over 500 HV room temperature under 50 range 400 600 °C. After heat treatment °C,...

An adaptive line equalizer for a 200-kb/s digital subscriber loop is developed in the form of monolithic LSI and implemented using 2.5-/spl mu/m CMOS technology. Most analog portions consist switched-capacitor circuits successfully designed to minimize power consumption, amount hardware, off-chip components. The main features are an /spl radic/f step equalizer, five-tap decision-feedback Delta/M D/A conversion, newly wave difference method (WDM), tankless timing extraction PLL, driver....

Describes novel schemes developed to meet the demand for a reusable embedded SRAM core application variety of SOC designs. PAS optimizes sense-amplifier activation timing by using combination program and automatic control. MRAD minimizes timing-overhead reducing fluctuation path-to-path delay. These experimentally demonstrated wide-operation range 0.5 1.4 V an access time 600 ps.

Ni-based carbon nanotube (CNT) composite coatings have low friction and wear resistance properties improved by codepositing CNTs in the matrix. However, there are some large nodules on surface of Ni-CNT because CNT aggregates Ni The purpose this study was to improve roughness coatings. For purpose, two kinds ultrasonic assisted electroplating using bath sonication method or horn were proposed. As a result, could effectively decrease nodule coating roughness. 0.1 μm Ra obtained. Carbon...

A DVD video recorder is proposed that frees viewers from restrictions on when a program can be viewed by allowing to played while the continues record other programs. This also makes recording, viewing, searching and managing programs much easier than with conventional VCR. The consists of two MPEG1+ encoders, one MPEG2 decoder, drive disk changer, hard-disk-drive.

The effects of carbon nanotube (CNT) composites on the elastic modulus nickel-based CNT composite coating were investigated using indentation method. moduli at concentrations 0-40 vol.% evaluated by experimentation and numerical calculations. was changed addition CNTs because changes in nickel crystal. structure matrix from columnar crystal to random due CNTs. coatings with low concentration can be calculated rule mixtures percentage each orientation value orientation, almost same as...