Plasma Parameter Dependence of Critical Particle Size at the Moment of Void Formation in RF Silane Plasmas

2008 ◽  
Author(s):  
C. R. Seon ◽  
K. B. Chai ◽  
W. Choe ◽  
S. Park ◽  
C. W. Chung ◽  
...  
Keyword(s):  
Particle Size ◽  
Plasma Parameter ◽  
Void Formation ◽  
Parameter Dependence ◽  
Critical Particle Size ◽  
The Moment

scholarly journals Influence of Al Particle Size and Firing Profile on Void Formation in Rear Local Contacts of Silicon Solar Cells

2016 ◽  
Vol 6 (1) ◽  
pp. 68-73 ◽  
Author(s):  
Katharina Dressler ◽  
Martina Kratt ◽  
Philipp A. Voss ◽  
Stefanie Ebert ◽  
Axel Herguth ◽  
...  
Keyword(s):  
Particle Size ◽  
Solar Cells ◽  
Void Formation ◽  
Silicon Solar Cells

scholarly journals A Microphysical Bulk Formulation Based on Scaling Normalization of the Particle Size Distribution. Part I: Description

2005 ◽  
Vol 62 (12) ◽  
pp. 4206-4221 ◽  
Author(s):  
Wanda Szyrmer ◽  
Stéphane Laroche ◽  
Isztar Zawadzki
Keyword(s):  
Particle Size ◽  
High Resolution ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Numerical Models ◽  
Radar Data ◽  
Retrieval Algorithm ◽  
Microphysical Processes ◽  
The Moment ◽  
Microphysical Parameterization

Abstract The authors address the problem of optimization of the microphysical information extracted from a simulation system composed of high-resolution numerical models and multiparameter radar data or other available measurements. As a tool in the exploration of this question, a bulk microphysical scheme based on the general approach of scaling normalization of particle size distribution (PSD) is proposed. This approach does not rely on a particular functional form imposed on the PSD and naturally leads to power-law relationships between the PSD moments providing an accurate and compact PSD representation. To take into account the possible evolution of the shape/curvature of the distribution, ignored within standard one- and two-moment microphysical schemes, a new three-moment scheme based on the two-moment scaling normalization is proposed. The methodology of the moment retrieval included in the three-moment scheme can also be useful as a retrieval algorithm combining different remote sensing observations. The developed bulk microphysical scheme presents a unified formulation for microphysical parameterization using one, two, or three independent moments, suitable in the context of data assimilation. The effectiveness of the scheme with different combinations of independent moments is evaluated by comparison with a very high resolution spectral model within a 1D framework on representative microphysical processes: rain sedimentation and evaporation.

Limiting austenite grain size of TiN-containing steel considering the critical particle size

2007 ◽  
Vol 56 (12) ◽  
pp. 1083-1086 ◽  
Author(s):  
Joonoh Moon ◽  
Sanghoon Kim ◽  
Jongbong Lee ◽  
Changhee Lee
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Austenite Grain Size ◽  
Austenite Grain ◽  
Critical Particle Size

scholarly journals Tailoring Adsorption Induced Switchability of a Pillared Layer MOF by Crystal Size Engineering

2020 ◽  
Author(s):  
Leila Abylgazina ◽  
Irena Senkovska ◽  
Sebastian Ehrling ◽  
Volodymyr Bon ◽  
Petko Petkov ◽  
...  
Keyword(s):  
Particle Size ◽  
Low Frequency ◽  
Polar Molecules ◽  
Adsorption Enthalpy ◽  
Factors Affecting ◽  
University Of Technology ◽  
Order Of Magnitude ◽  
Crystal Structural ◽  
Critical Particle Size ◽  
Characteristic Adsorption

The pillared layer framework DUT-8(Zn) (Zn<sub>2</sub>(2,6-ndc)<sub>2</sub>(dabco), 2,6-ndc = 2,6-naphthalenedicarboxylate, dabco = 1,4-diazabicyclo-[2.2.2]-octane, DUT = Dresden University of Technology) is a prototypical switchable MOF, showing characteristic adsorption and desorption induced open phase (<i>op</i>) to closed phase (<i>cp</i>) transformation associated with huge changes in cell volume. We demonstrate switchability strongly depends on a framework-specific critical particle size (d<i><sub>crit</sub></i>). The solvent removal process (pore desolvation stress contracting the framework) significantly controls the <i>cp</i>/<i>op</i> ratio after desolvation and, subsequently, the adsorption induced switchability characteristics of the system. After desolvation, the dense <i>cp</i> phase of DUT-8(Zn) shows no adsorption-induced reopening and therefore is non-porous for N<sub>2</sub> at 77 K and CO<sub>2</sub> at 195 K. However, polar molecules with a higher adsorption enthalpy, such as the polar molecules such as chloromethane at 249 K and dichloromethane (DCM) at 298 K can reopen the macro-sized crystals upon adsorption. For macro-sized particles, the outer surface energy is negligible and only the type of metal (Zn, Co, Ni) controls the DCM-induced gate opening pressure. The framework stiffness increases from Zn to Ni as confirmed by DFT calculations, X-ray crystal structural analyses, and low frequency Raman spectroscopy. The partial disintegration of the Zn based node hinges produces an overall increased stabilization of<i> cp </i>vs. <i>op</i> phase shifts the critical particle size at which switchability starts to become suppressed to even lower values (d<i><sub>crit</sub></i> < 200 nm) as compared to the Ni-based system (<i>d<sub>crit</sub></i> ≈ 500 nm). Hence, the three factors affecting switchability (energetics of the empty host, (<i>E<sub>op</sub>-E<sub>cp</sub></i>) (I), particle size (II), and desolvation stress (III)) appear to be of the same order of magnitude and should be considered collectively, not individually.

The moment ratios of particle size distributions in some simple growth models

1980 ◽  
Vol 17 (4) ◽  
pp. 956-967 ◽  
Author(s):  
H. L. MacGillivray
Keyword(s):  
Particle Size ◽  
Size Distribution ◽  
Growth Model ◽  
Hazard Rate ◽  
Growth Models ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Initial Size ◽  
The Moment ◽  
Simple Growth

Important parameters of particle size distributions in dispersed systems in engineering and related fields are ratios of moments and inverse powers of these ratios, known as mean sizes. The variation in these parameters is examined for the simplest growth model in which the size distribution is translated, and the results for this process considered in relation to the problems of models of other growth processes. For initial size distributions with monotone hazard rate, the results are particularly significant, and the properties of the normalised moments of other distributions are also considered.

Scuffing Failure Due to an Abrasive Contaminant and Filter Suitability in High Pressure Injection Fuel System

Tribology ◽  
2005 ◽  
Author(s):  
Badar Rashid ◽  
M. Afzaal Malik ◽  
Shahab Khushnood
Keyword(s):  
Experimental Data ◽  
Particle Size ◽  
High Pressure ◽  
Hydraulic Head ◽  
Flash Temperature ◽  
Pressure Injection ◽  
Head Assembly ◽  
Critical Particle Size ◽  
Scuffing Failure ◽  
High Pressure Injection

The field studies have revealed that there is an unprecedented high failure rate of rotary diesel fuel injection pump (RDFIP). The presence of rigid abrasive contaminant between the plunger and sleeve of hydraulic head assembly of RDFIP causes scuffing failure. The abrasive contaminant is modeled as a spherically shaped rigid particle. The contaminant is envisioned to penetrate into the sleeve while positioning itself in rubbing contact with the plunger. Excessive temperature rise known as flash temperature between the particle-plunger interface is used as an indication of whether scuffing would take place. Flash temperature is determined by incorporating operating speed of pump, particle size, minimum film thickness, fuel properties, thermomechanical and surface properties of plunger and sleeve. Thermomechanical properties are determined through material composition of plunger and sleeve by spectroscopic techniques. Coordinate measuring machine is used to determine the radial clearance between the plunger and sleeve. Three high-pressure injection pumps are taken as case study for obtaining experimental data. This experimental data is used as an input in our theoretical model for the determination of flash temperature duly analyzing partial and diametric penetration of the abrasive contaminant. The model uses flash temperature in conjunction with the material properties to determine the critical particle size that may result in scuffing failure. The exact rating of fuel filter based on the critical particle size of the contaminant producing scuffing failure in the plunger and sleeve of hydraulic head assembly of RDFIP is also determined. The range of critical particle size initiating significant abrasive wear is determined and validated with the experimental results available in literature.

Scuffing Failure Analysis Due to an Abrasive Contaminant in High Pressure Injection Fuel System

2005 ◽  
Author(s):  
Tayyaba Sultana ◽  
Obaid ur Rehman ◽  
Badar Rashid ◽  
M. Afzaal Malik
Keyword(s):  
Particle Size ◽  
High Pressure ◽  
Fuel System ◽  
Flash Temperature ◽  
Pressure Injection ◽  
Filter Size ◽  
Predicted Model ◽  
Critical Particle Size ◽  
Scuffing Failure ◽  
High Pressure Injection

The presence of rigid abrasive contaminant between the plunger and sleeve of high-pressure injection fuel system causes scuffing failure. The abrasive contaminant is modeled as a spherically shaped rigid particle. The contaminant is envisioned to penetrate into the sleeve while positioning itself in rubbing contact with the plunger. Excessive temperature rise known as flash temperature between the particle-plunger interface is used as an indication of whether scuffing would take place. The model uses flash temperature in conjunction with the material properties to determine the critical particle size that may result in scuffing failure. The range of critical particle size initiating significant abrasive wear is determined and validated with the experimental results available in literature. Our predicted model can be used as a guide for selecting an appropriate filter size for high-pressure injection fuel system.

Sign in / Sign up

Export Citation Format

Share Document