Results
repositories = "HAL - Hyper Article on Line"
> : "Void"
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BUBBLE SHAPE AND TRANSPORT DURING LCM PROCESSES: EXPERIMENTAL MODELING IN A T-JUNCTION TUBE
Description :
Long fiber composite materials can be elaborated by Liquid Composite Molding (LCM), a family of processes where fibrous preforms are injected by a low viscosity resin. During this process, we have to pay particular attention to the void formation inside the preform because it could modify the materi...
Repository :
HAL - Hyper Article on Line
Language(s) :
English
Low frequency instabilities during dust particle growth in a radio-frequency plasma
Description :
In this paper, instabilities appearing in a dusty plasma are experimentally investigated. These low frequency self-excited instabilities appear during dust particle growth and are characterized by a frequency spectrum evolving during this process. The onset, the time evolution and the main character...
Repository :
HAL - Hyper Article on Line
Language(s) :
English
Successive Generations of Dust in Complex Plasmas: A Cyclic Phenomenon in the Void Region
Description :
Dust formation and growth in plasmas are in most cases continuous cyclic phenomena. We show that the growth of new dust generations takes place in a dust-free region, usually called a void, in the dust cloud. The three-step process of new dust generation is detailed thanks to the correlation between...
Repository :
HAL - Hyper Article on Line
Language(s) :
English
Plasma Emission Modifications and Instabilities Induced by the Presence of Growing Dust Particles
Author(s) :
Mikikian, Maxime
,
Couëdel, Lénaïc
,
Cavarroc, Marjorie
,
Tessier, Yves
,
Boufendi, Laifa
Description :
Formation of dust particles in a plasma can strongly change its properties due to electron attachment on dust surface. An easy way to detect dust formation is to analyze modifications of the plasma emission. In this paper, changes in the plasma emission are related to the growth of dust particles. W...
Repository :
HAL - Hyper Article on Line
Language(s) :
English
Porous materials with two populations of voids under internal pressure: II. Growth and coalescence of voids
Description :
This study is devoted to the mechanical behavior of polycrystalline materials with two populations of voids, small spherical voids located inside the grains and larger spheroidal voids located at the grain boundaries. In part I of the work, instantaneous effective stress-strain relations were derive...
Repository :
HAL - Hyper Article on Line
Language(s) :
English
EXPERIMENTAL ANALYSIS TO IDENTIFY THE DEFORMATION MECHANISMS DURING SINTERING OF COLD COMPACTED POLYTETRAFLUOROETHYLENE (PTFE) POWDERS
Description :
Thermal dilatometry analyses were performed on specimens made of pure or filled PTFE powders. The specimens were obtained by isostatic pressing or by uniaxial compaction up to different values of the residual void ratio. The large deformations that were recorded during different heating-cooling trea...
Repository :
HAL - Hyper Article on Line
Language(s) :
English
Experimental investigations of void dynamics in a dusty discharge
Description :
The first electrical and spectroscopic characterizations of an instability, usually called the ‘‘heartbeat'' instability, occurring in a laboratory dusty plasma are reported. The heartbeat instability consists of successive contractions and expansions of the central dust free region observed in a de...
Repository :
HAL - Hyper Article on Line
Language(s) :
English
Dusty plasmas: synthesis, structure and dynamics of a dust cloud in a plasma
Author(s) :
Mikikian, Maxime
,
Couëdel, Lénaïc
,
Cavarroc, Marjorie
,
Tessier, Yves
,
Boufendi, Laifa
Description :
Plasmas are energetic media that can give birth to dust particles due to the presence of reactive gases or plasma-surface interactions. Industrial plasmas are often concerned by these dust particles that can be either unwanted or useful for the process. For fusion plasmas, production of dust particl...
Repository :
HAL - Hyper Article on Line
Language(s) :
English
Dust growth instabilities in silane-based plasmas
Description :
In this paper we report on two instabilities observed in dusty plasmas, at different stages of dust particle formation. Experiments are performed in a low-pressure Ar/SiH4 radiofrequency plasma. The first instability, occuring at the transition between nanocrystal accumulation and coalescence phases...
Repository :
HAL - Hyper Article on Line
Language(s) :
English
Formation, growth and behavior of dust particles in a sputtering discharge
Author(s) :
Couëdel, Lénaïc
,
Cavarroc, Marjorie
,
Tessier, Yves
,
Mikikian, Maxime
,
Boufendi, Laifa
,
A. Samarian, Alexander
Description :
Dust particle growth instability and residual dust charges in a rf discharge have been studied. Dust particles were grown by sputtering of a polymer material previously deposited on the electrodes. We show that two regimes of the dust particle growth instability exist and are characterized by their ...
Repository :
HAL - Hyper Article on Line
Language(s) :
English