РАЗРАБОТКА SPICE-МОДЕЛИ МДП-ВАРАКТОРА

2020 ◽  
Vol 96 (3s) ◽  
pp. 308-313
Author(s):  
Д.С. Шипицин ◽  
А.Г. Потупчак ◽  
А.В. Шемякин
Keyword(s):  
Equivalent Circuit ◽  
Process Parameters ◽  
Fabrication Process ◽  
Mos Varactor

Разработана эквивалентная схема, методика экстракции SPICE-параметров МДП-варактора на основе результатов проведенных измерений специальных тестовых структур в составе пластин, модель верифицирована, сформирован модуль, учитывающий статистический разброс значений параметров процесса технологического производства. An appropriate equivalent circuit of MOS-varactor has been developed, as well as a technique for extracting its SPICE-parameters, based on the results of test structures measurements. The model has been verified, a statistical module has been created that takes into account the fabrication process parameters variation.

Jewelry Fabrication via Selective Laser Melting of Glass

2014 ◽  
Author(s):  
Miranda Fateri ◽  
Andreas Gebhardt
Keyword(s):  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
Process Parameters ◽  
Glass Powder ◽  
Fabrication Process ◽  
Complex Geometries ◽  
Laser Melting ◽  
Conventional Methods

Selective Laser Melting (SLM) is one of the Additive Manufacturing (AM) technologies applicable for producing complex geometries which are typically expensive or difficult to fabricate using conventional methods. This process has been extensively investigated experimentally for various metals and the fabrication process parameters have been established for different applications; however, fabricating 3D glass objects using SLM technology has remained a challenge so far although it could have many applications. This paper presents a summery on various experimental evaluations of a material database incorporating the build parameters of glass powder using the SLM process for jewelry applications.

Fabrication Process for a High Strength 9Cr-2W Steel Sheet

2010 ◽  
Vol 638-642 ◽  
pp. 2263-2267
Author(s):  
Tae Kyu Kim ◽  
Chang Hee Han ◽  
Sung Ho Kim ◽  
Chan Bock Lee
Keyword(s):  
Heat Treatment ◽  
Cold Rolling ◽  
Process Parameters ◽  
Carbon Concentration ◽  
Room Temperature ◽  
Steel Sheet ◽  
High Strength ◽  
Tensile Tests ◽  
Fabrication Process ◽  
Martensitic Steels

This study deals with the fabrication of high strength ferritic/martensitic steels by a control of both the carbon concentration and the fabrication process parameters. The 9Cr-2W steels containing a carbon concentration of 0.05, 0.07 and 0.11 wt% were normalized at 1050oC for 1 h, followed by a tempering at 550 and 750oC for 2 h, respectively. The results of the tensile tests at room temperature indicated that the tensile strengths were increased with an increase of the carbon concentration from 0.05 wt% to 0.07 wt%, but no more increase was observed when the carbon concentration was increased further up to 0.11%. After a cold rolling from a 4 mm to a 1 mm thickness without/with an intermediate heat treatment and a final heat treatment, the results of the tensile tests exhibited that superior tensile properties were obtained when the fabrication processes were composed of a tempering at 550oC, and a cold rolling with several intermediate heat treatments. These results could be attributed to the finely distributed precipitates in the partially recrystallized matrix. The optimized carbon concentration and the controlled fabrication process parameters are thus suggested to fabricate a high strength 9Cr-2W steel sheet.

scholarly journals Raster analysis of Fused Filament Fabrication process

2021 ◽  
Author(s):  
Roberto Spina ◽  
Bruno Cavalcante
Keyword(s):  
Rheological Properties ◽  
Analytical Model ◽  
Process Parameters ◽  
Fabrication Process ◽  
Fused Filament Fabrication ◽  
Experimental Procedure ◽  
Simple Geometry ◽  
Raster Analysis ◽  
Build Time

The objective of the present work is to study the raster generation to realize Fused Filament Fabrication parts. The research in this paper focused on the evaluation of the deposition of a simple geometry with a FFF machine, supported by an analytical model to compute the build time, also evaluating the geometrical variations caused by changes in process parameters. The main parameters were the print temperature and speed as a function of the thermal and rheological properties of the PLA filament. The study identified essential correlations between process parameters, raster dimensions, and filament properties. An experimental procedure, supported by an analytical model, was implemented for computing raster time and material dimensions.

Effects of the fabrication process parameters on the precipitates and mechanical properties of a 9Cr–2W–V–Nb steel

2009 ◽  
Vol 389 (3) ◽  
pp. 359-364 ◽  
Author(s):  
Tae Kyu Kim ◽  
Jong Hyuk Baek ◽  
Chang Hee Han ◽  
Sung Ho Kim ◽  
Chan Bock Lee
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Fabrication Process

Equivalent circuit model of reliable RF-MEMS switches for component synthesis, fabrication process characterization and failure analysis

2013 ◽  
Vol 6 (1) ◽  
pp. 73-81
Author(s):  
Núria Torres Matabosch ◽  
Fabio Coccetti ◽  
Mehmet Kaynak ◽  
Beatrice Espana ◽  
Bernd Tillack ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Rf Mems ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Fabrication Process ◽  
Mems Switches ◽  
Process Characterization ◽  
Rf Mems Switches ◽  
Bicmos Technology ◽  
Process Dispersion

An accurate and very large band (30–110 GHZ) lumped element equivalent circuit model of capacitive RF-MEMS components based on a standard 250 nm BiCMOS technology is presented. This model is able to predict the effect of the fabrication process dispersion, synthesize new components and monitor the failure mechanisms. Moreover, a reliability study is performed in order to define a screening criterion (VPOUT > 36 V and |VPIN − VPOUT| ≤ 1) based on which a selection of the devices with optimal performance in terms of RF and lifetime performance can be made. Finally, a very quick effective technique (non-intrusive) is proposed to carry out this operation.

scholarly journals Effect of fabrication process parameters on the apex-radius of STM tungsten nanotip

Scanning ◽  
2009 ◽  
Vol 31 (2) ◽  
pp. 65-74 ◽  
Author(s):  
Gh. Tahmasebipour ◽  
Y. Hojjat ◽  
V. Ahmadi ◽  
A. Abdullah
Keyword(s):  
Process Parameters ◽  
Fabrication Process

scholarly journals Optimization of fused filament fabrication process parameters under uncertainty to maximize part geometry accuracy

2020 ◽  
Vol 35 ◽  
pp. 101331
Author(s):  
Paromita Nath ◽  
Joseph D. Olson ◽  
Sankaran Mahadevan ◽  
Yung-Tsun Tina Lee
Keyword(s):  
Process Parameters ◽  
Fabrication Process ◽  
Fused Filament Fabrication ◽  
Part Geometry

Process Parameters Optimization in Multilayer Laser Solid Freeform Fabrication Process Using a 3D Transient Numerical Model

2007 ◽  
Author(s):  
Masoud Alimardani ◽  
Ehsan Toyserkani ◽  
Christ P. Paul
Keyword(s):  
Process Parameters ◽  
Solid Freeform Fabrication ◽  
Parameters Optimization ◽  
Fabrication Process ◽  
Main Process ◽  
Thin Wall ◽  
Aisi 304L ◽  
Freeform Fabrication ◽  
Modeling Approach ◽  
Laser Solid Freeform Fabrication

This paper presents a 3D transient numerical approach for thermal and strain/stress modeling of the multilayer laser solid freeform fabrication process, by which correlations between the main process parameters and their effects on the final build-up properties can be studied. This model can be used to optimize the process parameters to increase the controllability of the geometrical and metallurgical variations resulted from the thermal and stress fields. Using this modeling approach, the geometry of the material deposited as well as temperature and thermal stress distributions across the process domain can be predicted based on the process parameters such as powder feed rate, process speed and laser power, assuming the interaction between the laser beam and powder stream is decoupled. The main process parameters affected by a multilayer deposition due to the formation of non-planar surfaces such as powder catchment are also incorporated into the modeling approach. To verify the proposed method, fabrication of a four-layer thin wall of stainless steel AISI 304L on a low carbon steel substrate is modeled with the same process parameters throughout the build-up process. The results show that the temperature and stress slightly increase at the end-points of layers 2, 3, and 4 which cause over deposited materials and micro-crack formations at these regions. The results are then used to discuss optimum process parameters which can be used to have a buildup with better geometrical and physical qualities. The reliability and accuracy of the model are experimentally verified.

Effects of Fabrication Process Parameters on the Properties of Cyclic Olefin Copolymer Microfluidic Devices

2006 ◽  
Vol 15 (5) ◽  
pp. 1060-1068 ◽  
Author(s):  
C.K. Fredrickson ◽  
Z. Xia ◽  
C. Das ◽  
R. Ferguson ◽  
F.T. Tavares ◽  
...  
Keyword(s):  
Process Parameters ◽  
Microfluidic Devices ◽  
Fabrication Process ◽  
Cyclic Olefin Copolymer ◽  
Cyclic Olefin
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