Development and Characterization of Tapered Silicon Etch Process by Topography Modeling for TSV Application

2010 ◽  
Vol 7 (1) ◽  
pp. 58-66
Author(s):  
N. Ranganathan ◽  
A. Malar ◽  
D.Y. Lee ◽  
K. Prasad ◽  
K.L. Pey
Keyword(s):  
Simulation Software ◽  
Process Models ◽  
Process Technology ◽  
Lag Effects ◽  
Aspect Ratios ◽  
Wide Range ◽  
Simulation Results ◽  
Set Up ◽  
High Degree

A dual-etch via tapering technology has been presented which combines Bosch process and isotropic etch process. It has been shown that the dual-etch process technology provides a high degree of process flexibility to the user by independently controlling and optimizing the etch rate and profile tapering process. Based on experimental work, RIE process models have been set up using ELITE simulation software from Silvaco. Detailed DOE has been done to optimize the RIE models so that the experimental and simulation results match over a wide range of via geometries and aspect ratios. The optimized models have been further used to predict the aspect ratio induced RIE lag effects.

scholarly journals From ‘ontological metaphor’ to semiotic make-believe: giving shape and substance to fictive objects of conception with the ‘globe gesture’

Signo ◽  
2016 ◽  
Vol 41 (70) ◽  
pp. 29 ◽  
Author(s):  
Jean-Remi Lapaire
Keyword(s):  
Mental Representations ◽  
Controlled Environment ◽  
Cognitive Artifact ◽  
Emotional Appeal ◽  
Physical Presence ◽  
Sense Of Reality ◽  
Suspension Of Disbelief ◽  
Set Up ◽  
High Degree

Speakers are moving cognizers who engage in bodily acts of conceptualization. The “globe gesture” is among the most spectacular forms of “manual thinking” (Streeck 2009) used in formal talk. A characterization of the kinesic action typical of the “globe gesture” is first provided that shows how “the image of a bounded, supportable object” is created (McNeill 1992) and set up in gesture space. As conceptual objects are created and masses of semantic substance fashioned, visible shape is given to shapeless mental representations. A powerful semiotic trick is performed with a simple cognitive artifact. Interestingly, a willing suspension of disbelief is required of speakers and listeners who must temporarily give up their rational conceptions of visibility, materiality and palpability to watch the symbolic manipulation of invisible objects. The basic expressive properties of the “globe gesture” are next characterized: outlining and isolating objects of conception; neutralizing semantic specification; establishing a joint focus of attention and imagination; shaping, displaying and unifying content; creating a sense of reality and existence through physical presence. Iconic modifications of the standard metaphoric hand configuration, virtuosic elaborations and creative blends are finally examined before reporting the results of an experimental study of the globe gesture’s heuristic properties in a controlled environment. 14 students attending a multimodal “kineflective” seminar used the hand configuration to engage in “choreographic thinking” (Forsythe 2009) and develop a haptic understanding of derivation, nominalization, substantivation, conceptual reification. The globe gesture acted as a facilitator so long as a high degree of generality was maintained but was promptly discarded when words with a strong emotional appeal were introduced (e.g. sadness, madness). Emblems and iconic gestures were spontaneously performed instead.

Design and characterization of a hybrid soft gripper with active palm pose control

2020 ◽  
Vol 39 (14) ◽  
pp. 1668-1685 ◽  
Author(s):  
Vignesh Subramaniam ◽  
Snehal Jain ◽  
Jai Agarwal ◽  
Pablo Valdivia y Alvarado
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Composite Structure ◽  
Element Model ◽  
Open Loop ◽  
Aspect Ratios ◽  
Maximum Payload ◽  
Wide Range ◽  
Pose Control

The design and characterization of a soft gripper with an active palm to control grasp postures is presented herein. The gripper structure is a hybrid of soft and stiff components to facilitate integration with traditional arm manipulators. Three fingers and a palm constitute the gripper, all of which are vacuum actuated. Internal wedges are used to tailor the deformation of a soft outer reinforced skin as vacuum collapses the composite structure. A computational finite-element model is proposed to predict finger kinematics. Thanks to its active palm, the gripper is capable of grasping a wide range of part geometries and compliances while achieving a maximum payload of 30 N. The gripper natural softness enables robust open-loop grasping even when components are not properly aligned. Furthermore, the grasp pose of objects with various aspect ratios and compliances can be robustly maintained during manipulation at linear accelerations of up to 15 m/s2 and angular accelerations of up to 5.23 rad/s2.

Analysis on the Contact Interaction between Thresher and Corn Ears Based on the DEM

2012 ◽  
Vol 246-247 ◽  
pp. 71-77
Author(s):  
Ya Jun Yu ◽  
Ji Yang Yu ◽  
Qing Long Li ◽  
Jian Qun Yu ◽  
Hong Fu
Keyword(s):  
Contact Interaction ◽  
Simulation Software ◽  
Contact Forces ◽  
Actual Situation ◽  
Mechanical Parts ◽  
Complex Process ◽  
Novel Method ◽  
Simulation Results ◽  
Set Up ◽  
Corn Kernels

The corn threshing process is a complex process of contact interaction between thresher mechanical parts and corn ears. The paper analyzed this process with the discrete element method (DEM). A method was set up to calculate the contact forces between thresher mechanical parts (boundary) and corn ears. The conditions for corn kernels threshing were established as well. On this basis, we developed the corn threshing simulation software, and simulated the corn threshing process using the software. The simulation results are close to the actual situation, and the results verify the feasibility and effectiveness of the new method. Thus we have laid the foundation for using the DEM to analyze the corn threshing process and putting forward a novel method for the optimal design of the corn thresher.

Paper 9: A Rotating Cylinder Viscometer for Measurement at Elevated Temperature and Pressure

1965 ◽  
Vol 180 (10) ◽  
pp. 153-162
Author(s):  
J. Wonham
Keyword(s):  
High Pressures ◽  
Rotating Cylinder ◽  
Wide Range ◽  
New Instrument ◽  
Temperature And Pressure ◽  
Major Alteration ◽  
Set Up ◽  
The Many ◽  
High Degree ◽  
Cylinder Viscometer

This paper records some of the recent experimental methods used to determine the viscosity of water. In drawing attention to the many techniques used (most relying upon calibration of the instrument by a fluid of known viscosity), the conclusion may be drawn that an absolute instrument is required which will produce results over a wide range of temperature and pressure. It has long been known that the rotating cylinder viscometer is capable of a high degree of accuracy, but technical considerations have, in the past, restrained most workers from pursuing this method at high pressures. Progress in the development of the rotating cylinder instrument for these conditions is described and specific problems encountered with this method are discussed. This work is a continuation of the design studies of Kjelland-Fosterud (1)† and Whitelaw (2) who both gave considerable thought to the problems associated with this type of instrument. The first instrument to be tested by the author was based on Whitelaw's design but it was found that certain aspects of this instrument required major alteration. A new instrument was set up and has been found suitable for accurate viscosity determination.

scholarly journals Capacity building for hydrological change – using a blended learning approach

2015 ◽  
Vol 366 ◽  
pp. 100-106
Author(s):  
H. Nacken
Keyword(s):  
Blended Learning ◽  
Capacity Building ◽  
Mena Region ◽  
Country Ownership ◽  
High Dependency ◽  
Hydrological Extremes ◽  
Wide Range ◽  
Set Up ◽  
Water Scarce ◽  
High Degree

Abstract. Extreme hydrological events have always been a challenge to societies. There is growing evidence that hydrological extremes have already become more severe in some regions. The Middle East and North Africa (MENA) region is characterized as one of the world’s most water-scarce and driest regions, with a high dependency on climate-sensitive agriculture. There is an urgent need for capacity building programmes that prepare water professionals and communities to deal with the expected hydrological changes and extremes. The most successful capacity building programmes are the country driven ones which involve a wide range of national stakeholders, have a high degree of in-country ownership and have an applicability character. The method of choice to set up such capacity building programmes will be through blended learning.

Numerical Investigation of the Pressure Drop Through Micro-Pillar Arrays for a Wide Range of Aspect Ratios

2013 ◽  
Author(s):  
Ahmed M. Taher ◽  
Benjamin Jones ◽  
Ihab G. Adam ◽  
Liesbet Lagae
Keyword(s):  
Pressure Drop ◽  
Numerical Investigation ◽  
Absolute Error ◽  
Maximum Absolute Error ◽  
Total Analysis System ◽  
Aspect Ratios ◽  
Pillar Diameter ◽  
Wide Range ◽  
Simulation Results ◽  
Micropillar Arrays

Accurate prediction of the pressure drop through micropillar arrays is essential for many micro total analysis system (μTAS) applications (e.g., liquid chromatography and filtration). Minimizing the pressure drop for such applications is often vital for performing their primary functions efficiently. In this paper, numerical investigation of pressure drop through square micropillar arrays with different pillar diameter and pitch was conducted. Finite volume discretization method was employed for the numerical simulations using commercial code. Simulation results were validated against experimental data from the literature. A parametric study of geometric variables (pillar diameter, pitch, and height) was performed. Models available from the literature for predicting the permeability of a 2D micropillar array were accessed by comparison to the numerical results. Both dimensional analysis and simulation results were used to develop a new model for square arrangements of micropillar arrays which shows good agreement with numerical simulation results for both 2D and 3D cases. The maximum absolute error between the 3D simulation results and predicted value of the pressure drop has been decreased from 67.3% using a model from the literature to only 1.9% using the proposed model.

APPLICATION OF COMPUTER SIMULATION IN IMPROVING THE PROCESS OF SCREWS PRODUCTION

2017 ◽  
Vol 66 (0) ◽  
pp. 89-96
Author(s):  
Julia Siderska ◽  
Katarzyna Perkowska
Keyword(s):  
Computer Simulation ◽  
Spatial Arrangement ◽  
Simulation Software ◽  
Production Flow ◽  
Processing Times ◽  
Machine Simulation ◽  
Process Line ◽  
Set Up ◽  
Plant Simulation

The aim of this work is to present and discuss the possibility of using computer simulation to improve the production flow of sheet metal screws in the carpentry plant. The paper includes descriptive and schematic characterization of the present production system of the plant in one of the Polish companies. Using the Tecnomatix Plant Simulation software, a digital model of the process line was drawn up, mirroring the spatial arrangement of workstations in the production hall and their operators, as well as actual processing times and set-up times of each machine. Simulation was performed to identify bottlenecks in the entire production process, and several modifications were proposed on that basis so as to optimize the workloads of the workstations and increase production.

scholarly journals On the use of COMSOL Multiphysics for seawater intrusion in fractured coastal aquifers

2018 ◽  
Vol 54 ◽  
pp. 00020 ◽  
Author(s):  
B. Mozafari ◽  
M. Fahs ◽  
B. Ataie-Ashtiani ◽  
C. T. Simmons ◽  
Rafic Younes
Keyword(s):  
Seawater Intrusion ◽  
Coastal Aquifers ◽  
Element Model ◽  
Simulation Software ◽  
Comsol Multiphysics ◽  
Software Environment ◽  
Discrete Fracture Model ◽  
Henry Problem ◽  
Wide Range ◽  
Set Up

COMSOL Multiphysics is a comprehensive simulation software environment for a wide range of applications. COMSOL has an interactive interface that facilitates the modeling procedure and allows an easy coupling of different physical processes. The Subsurface Flow module extends the COMSOL modeling environment to applications related to fluid flow in saturated and variably saturated porous media. COMSOL is increasingly used in the investigation of geophysical, hydrogeological and environmental phenomena. The main goal of this work is to explore the ability of COMSOL for simulating seawater intrusion (SWI) in fractured coastal aquifers. Numerical modeling of such a problem is of high interest as fractured/karstic coastal aquifers are widespread and processes of SWI in the presence of fractures remains poorly understood. We set up a COSMOL model for the popular Henry problem. The accuracy of COMSOL is highlighted by comparison against the semianalytical solutions for simple homogeneous aquifers. For fractured aquifers, the performance of COSMOL is evaluated by comparison against an in-house finite element model based on the discrete fracture model and against the results of existing works. Given its versatility and flexibility, COMSOL shows promise as a tool for SWI in coastal aquifers.

scholarly journals Study of online measurements techniques of metallic phase spatial distribution into a corium pool

2020 ◽  
Vol 225 ◽  
pp. 08003
Author(s):  
D. Tisseur ◽  
M. Cavaro ◽  
F. Rey ◽  
K. Paumel ◽  
N. Chikhi ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Melting Furnace ◽  
Oxide Phase ◽  
Immiscible Liquid ◽  
Simulation Software ◽  
Induction Melting ◽  
X Rays ◽  
On Line ◽  
Set Up

In the context of in-vessel retention (IVR) strategy in order to better assess the risk of reactor vessel failure, the knowledge related to the kinetics of immiscible liquid phases stratification phenomenon needs to be further improved. So far, only one medium-scale experiment (MASCA-RCW, in the frame of the OECD MASCA program) gives direct information regarding the transient relocation of metal below the oxide phase through post-mortem measurements. No experimental characterization of the stratification inversion kinetics when heavy metal becomes lighter and relocates at the top exists. Further investigation of these hydrodynamic and thermochemical processes could be made possible thanks to on line instrumentation enabling to follow displacement of oxidic and metallic phases into the corium pool. At CEA Cadarache, studies are under progress to set up innovative technologies for corium stratification monitoring which would be integrated to a cold crucible induction melting furnace. Based on space and time resolution specifications, three on-line measurements techniques were selected and studied. The first one is an ultrasonic technique using a refractory material waveguide and based on a time-of-flight measurement. We present the feasibility approach with the preliminary results obtained during experiments at high temperature on VITI facility. The second method consists in electromagnetic characterization of the corium pool thanks to an excitation by a magnetic field induced by surroundings coils and measurement of magnetic response by sensors placed around the crucible. A modelling study has enabled to define an appropriate experimental configuration. An experimental set up has also been tested to verify the calculation results. The third technique is 2D X-rays imaging. A feasibility study for a real-time X-ray imagingwith a framerate of 1 image/s has been performed using home-made simulation software MODHERATO, accounting forscattering, based on corium behavior previsions. Results on thedetection of interfaces between different type of corium phases(oxide, light metal, heavy metal) are shown.

Dynamics Simulation Analysis of Flexible Multibody of Parallel Robot

2007 ◽  
Vol 10-12 ◽  
pp. 647-651 ◽  
Author(s):  
C.X. Zhu ◽  
Yong Xian Liu ◽  
Guang Qi Cai ◽  
L.D. Zhu
Keyword(s):  
Simulation Analysis ◽  
Parallel Robot ◽  
Rigid Bodies ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Element Analysis ◽  
Flexible Multibody ◽  
Simulation Results ◽  
Set Up ◽  
Parallel Machine Tool

Take a kind of 3-TPT parallel robot as an example, the model of flexible multibody of parallel machine tool is built by using multibody dynamics simulation software ADAMS and finite element analysis software ANSYS. And dynamics equation of flexible body in spatial is also set up, after that the dynamics simulation is carried out. Then the simulation results of rigid bodies are compared with flexible ones, and the results show that the forces applied on flexible bodies appear high nonlinear, so the simulation results of flexible multibody system are more authentic, nicety and can reflect actual dynamics characteristic of parallel robot.

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