Mass production of AlN substrates by high speed homoepitaxial growth

2021 ◽  
Author(s):  
Yoshinao Kumagai ◽  
Nao Takekawa ◽  
Ken Goto ◽  
Toru Nagashima ◽  
Reo Yamamoto ◽  
...  
Keyword(s):  
Mass Production ◽  
High Speed ◽  
Homoepitaxial Growth

High-Speed Wired Drill Pipe and its Corresponding Manufacture & Test Technology Research

2021 ◽  
Author(s):  
Haochen Han ◽  
Yong Zhang ◽  
Jia Chen ◽  
Qi Sun ◽  
Zhimeng Fang ◽  
...  
Keyword(s):  
Mass Production ◽  
Manufacturing Process ◽  
High Speed ◽  
Transmission Rate ◽  
Drill Pipe ◽  
Pass Rate ◽  
Series System ◽  
Validation Test ◽  
Test Technology ◽  
Drill Pipes

Abstract High-speed wired drill pipe and its corresponding communication technology not only can achieve high-speed transmission rate and high-capacity, but also can realize real-time monitoring and dual-way communication in whole section, which can prevent downhole problems effectively. As a series system, the homogeneity and robustness of these wired drill pipes are crucial. This paper focuses on how to overcome the difficulty in manufacturing process of information drill pipe and complete the validation test. In order to guarantee the quality of information drill pipe and satisfy the technological requirements of mass production, we optimize the manufacturing process and put forward reasonable test techniques. The optimizations of manufacturing process include the analysis on constant tension of pressure pipe, quantitative cutting pipe and perforation in pipe nozzle. The testing techniques includes magnetic coupling coil impedance test, high pressure test, communication performance test of both single pipe and series system. The test result can be judged and evaluated by the attenuation value of the signal attenuation test and the signal reflection waveform as well as sealing reliability. With the help of the optimization of the manufacturing process and the application of new tooling, the quality and robustness of information drill pipe is improved obviously. Pass rate in primary assembly is increased from 70% to 92%. After the second assembly, pass rate can be increased to 99.5%. Besides, the work efficiency is greatly improved and the process requirements of mass production are satisfied. The validation test can screen out the drill pipe with poor quality and performance effectively thus to improve the reliability of the whole system. By means of the improvement of manufacturing and the validation test, the comprehensive pass rate of information drill pipes is increased from 84% to 95%. During three field tests in Jilin and Daqing Oilfield, the information drill pipes functioned well and accomplished all the test tasks successfully. High-speed wired drill pipe can improve the downhole data transmission on a large margin. The theorical transmission rate can be up to 100 kbps, 10,000 times as much as the traditional mud impulse telemetry. The manufacturing optimization and test technology can guarantee the performance and realize downhole data highway.

A Low Power - High Speed CNTFETs Based Full Adder Cell With Overflow Detection

2019 ◽  
Vol 11 (1) ◽  
pp. 80-87 ◽  
Author(s):  
Jitendra Kumar Saini ◽  
Avireni Srinivasulu ◽  
Renu Kumawat
Keyword(s):  
Mass Production ◽  
High Speed ◽  
Field Effect Transistor ◽  
Full Adder ◽  
Enabling Technology ◽  
Look Ahead ◽  
Ripple Carry Adder ◽  
Effect Transistor ◽  
Cad Tool ◽  
Power Delay Product

The transformation from the development of enabling technology to mass production of consumer-centric semiconductor products has empowered the designers to consider characteristics like robustness, compactness, efficiency, and scalability of the product as implicit pre-cursors. The Carbon Nanotube Field Effect Transistor (CNFET) is the present day technology. In this manuscript, we have used CNFET as the enabling technology to design a 1-bit Full Adder (1b-FA16) with overflow detection. The proposed 1b-FA16 is designed using 16 transistors. Finally, the proposed 1b-FA16 is further used to design a Ripple Carry Adder (RCA), Carry Look Ahead Adder (CLA) circuit and RCA with overflow bit detection. Methods and Results: The proposed 1b-FA16 circuit was designed with CNFET technology simulated at 32 nm with a voltage supply of +0.9 V using the Cadence Virtuoso CAD tool. The model used is Stanford PTM. Comparison of the existing full adder designs with the proposed 1b-FA16 design was done to validate the improvements in terms of power, delay and Power Delay Product (PDP). Table 2, shows the results of comparison for the proposed 1b-FA16 with the existing full adder designs implemented using CNFET for parameters like power, delay and power delay product. Conclusion: It can be concluded that the proposed 1b-FA16 yielded better results as compared to the existing full adder designs implemented using CNFET. The improvement in power, delay and power delay product was approximately 11%, 9% and 24% respectively. Hence, the proposed circuit implemented using CNFET gives a substantial rate of improvements over the existing circuits.

JEAN-NICOLAS-LOUIS DURAND: MACHINE OF ARCHITECTURE

2018 ◽  
Vol 8 (2) ◽  
pp. 82-88
Author(s):  
Elina V. DANILOVA
Keyword(s):  
Mass Production ◽  
High Speed ◽  
Design Methodology ◽  
Urban Expansion ◽  
Simple Design ◽  
Public Buildings ◽  
Project Approach ◽  
Modern City ◽  
The Project Approach

The article deals with the design methodology invented by the French architect Jean-Nicolas-Louis Durand as a machine of mass production of architecture. The author describes the historical and temporal background which determined the requirements for the design and construction of a large number of public buildings. The historical parallel between diff erent epochs when urban expansion became the reason for the invention of methods of high-speed and simple design of various objects is studied. Duran’s methodology is described based on the analysis of two theoretical works. The positive and negative aspects of the project approach based on such methodology are investigated. The role of Duran’s work in the process of creating architecture for the modern city is established.

Roller Chain as a Transfer Drive for the Automobile

1981 ◽  
Vol 103 (1) ◽  
pp. 19-28 ◽  
Author(s):  
D. N. C. Davies ◽  
K. G. Gustafsson ◽  
K. E. Nordkvist ◽  
P. J. Owen
Keyword(s):  
Quality Control ◽  
Mass Production ◽  
High Speed ◽  
Development Program ◽  
Front Wheel ◽  
Joint Effort ◽  
Chain System ◽  
Wheel Drive ◽  
Noise Evaluation ◽  
Road Testing

The paper is the result of a joint effort by Renold Ltd. and Saab Scania dealing with the development of a transfer drive system for a production Saab front wheel drive automobile. The drive consists of three simple roller chains staggered third of a tooth combined with automatic chain tensioning and adjustment. The design of the transfer drive is described - comparisons with gears - bearing arrangements - resulting economies etc. Development of the chain system is described together with details of automatic tensioning and load measurement. The Saab development program is dealt with including high-speed rig and road testing plus noise evaluation and assessment. The mass production aspect, quality control, and experience in service is also covered.

scholarly journals MANUFACTURING AND QUALITY ASSURANCE OF LIGHTWEIGHT PARTS IN MASS PRODUCTION

2018 ◽  
Vol 18 (3) ◽  
pp. 42-56
Author(s):  
Lothar KROLL ◽  
Adam CZECH ◽  
Rainer WALLASCH
Keyword(s):  
Mass Production ◽  
Composite Structures ◽  
High Speed ◽  
Large Scale ◽  
Fiber Composite ◽  
Thermoplastic Composites ◽  
Materials Testing ◽  
Scale Production ◽  
Damage Development ◽  
And Function

Production-related preliminary damage and residual stresses have significant effects on the functions and the damage development in fiber composite components. For this reason, it is important, especially for the safety-relevant components, to check each item. This task becomes a challenge in the context of serial production, with its growing importance in the field of lightweight components. The demand for continuous-reinforced thermoplastic composites increases in various industrial areas. According to this, an innovative Continuous Orbital Winding (COW) process was carried out within the framework of the Federal Cluster of Excellence EXC 1075 “MERGE Technologies for Multifunctional Lightweight Structures”. COW is aiming for mass-production-suited processing of special semi-finished fiber reinforced thermoplastic materials. This resource-efficient and function-integrated manufacturing process contains a combination of thermoplastic tape-winding with automated thermoplastic tape-laying technology. The process has a modular concept, which allows implementing other special applications and technologies, e.g. integration of different sensor types and high-speed automated quality inspection. The results show how to control quality and improve the stability of the COW process for large-scale production. This was realized by developing concepts of a fully integrated quality-testing unit for automatic damage assessment of composite structures. For this purpose, the components produced in the COW method have been examined for imperfections. This was performed based on obtained results of non-destructive or destructive materials testing.

High-speed Homoepitaxial Growth of 4H-SiC

2012 ◽  
Vol 27 (8) ◽  
pp. 785-789
Author(s):  
Ming-Xing ZHU ◽  
Biao SHI ◽  
Yi CHEN ◽  
Xue-Chao LIU ◽  
Er-Wei SHI
Keyword(s):  
High Speed ◽  
Homoepitaxial Growth

Optimum Velocity Control of Die Casting Plunger Accounting for Air Entrapment and Shutting

2008 ◽  
Vol 2 (4) ◽  
pp. 259-265 ◽  
Author(s):  
Ken'ichi Yano ◽  
◽  
Kotaro Hiramitsu ◽  
Yoshifumi Kuriyama ◽  
Seishi Nishido ◽  
...  
Keyword(s):  
Mass Production ◽  
High Speed ◽  
Die Casting ◽  
Control Input ◽  
Velocity Control ◽  
Air Entrapment ◽  
Fluid Behavior ◽  
Complex Shapes ◽  
Computational Fluid Dynamics Cfd ◽  
Optimum Velocity

Die casting in mass production has the advantage of producing complex shapes precisely, but the disadvantage of air entrapment in high-speed injection molding. Plunger velocity control very effectively avoids air entrapment. Using computational fluid dynamics (CFD), we analyzed fluid behavior, the amount of air trapped, and air shutting caused by die casting plunger movement. We calculated optimum die casting plunger velocity control input to reduce or prevent air entrapment and air shutting in die casting products. We also conducted optimization using a genetic algorithm incorporating a CFD simulator.

Molecular beam homoepitaxial growth of MgO(001)

1994 ◽  
Vol 9 (11) ◽  
pp. 2944-2952 ◽  
Author(s):  
S.A. Chambers ◽  
T.T. Tran ◽  
T.A. Hileman
Keyword(s):  
Electron Spectroscopy ◽  
High Speed ◽  
Molecular Beam ◽  
Step Flow ◽  
Homoepitaxial Growth ◽  
Crystallographic Order ◽  
Step Flow Growth ◽  
First Time

We describe homoepitaxial growth and detailed in situ characterization of MgO(001). We have used, for the first time, high-speed Auger electron spectroscopy as a real-time probe of film composition during growth. Excellent short-range and long-range crystallographic order are achieved in films grown to a thickness of several hundred angstroms in the substrate temperature range of 450 °C to 750 °C. Moreover, the films become more laminar as the growth temperature increases, suggesting that MgO grows homoepitaxially by the step-flow growth mechanism at elevated temperature. The surfaces of films grown at 650°and 750 °C are smoother than those obtained by cleaving MgO(001).

scholarly journals Design and Fabrication of Friction Stir Welding Machine

2018 ◽  
Vol 207 ◽  
pp. 03022
Author(s):  
Jithin Ambarayil Joy ◽  
Muhammad Sajjad ◽  
Dong-Won Jung
Keyword(s):  
Friction Stir Welding ◽  
Mass Production ◽  
High Speed ◽  
Work Piece ◽  
Production Time ◽  
Time Production ◽  
Friction Stir ◽  
Welding Machine ◽  
High Speed Drilling ◽  
Working Principle

The aim of the project is to manufacture a welding machine which simplifies the work and improve the accuracy. The working principle of this machine is different other that of other welding machine. The aluminum work piece is held in the vice. The two pieces of aluminum work piece is welded with the help high speed drilling head with friction tool. The working principle is very easy and at the same time production time is very much reduced. This machine is best suitable for mass production

Developing Technologies of SiC Gas Source Growth Method

2016 ◽  
Vol 858 ◽  
pp. 23-28 ◽  
Author(s):  
Jun Kojima ◽  
Yuichiro Tokuda ◽  
Emi Makino ◽  
Naohiro Sugiyama ◽  
Norihiro Hoshino ◽  
...  
Keyword(s):  
Growth Rate ◽  
Mass Production ◽  
High Speed ◽  
High Growth ◽  
Maximum Growth ◽  
High Growth Rate ◽  
Average Growth ◽  
Gas Source ◽  
Growth Method ◽  
Production Technologies

In order to diffuse the use of SiC, mass-production technologies of SiC wafers are needed. It is easy to be understood that high-speed and long-sized growth technologies are connected directly with mass-production technologies. The gas source growth method such as HT-CVD has the possibilities and the potential of the high-speed and long-sized growth. In this article, it was clarified that the high growth rate were achieved by the control of the source gas partial pressures and by the gas boundary layers. The average growth rate was 1mm/h on the f4 inch-diameter crystal, and the maximum growth rate reached 3.6 mm/h on the 12.5x25 mm tetragon by the above gas control. The crystal qualities of the gas source methods were also evaluated the equivalent level in comparison with the sublimation method. Concerning the 1mm/h-growth f3 inch crystal, the densities of TSDs were kept in the 102 cm-2 levels from the seed to the upper-side of the ingot. Moreover, the ingot size increased year by year and a f4 inch x 43 mm sized ingot has been developed.

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