ChemInform Abstract: PROPANE PYROLYSIS DURING INITIAL STAGE. PART I. EXPERIMENTAL STUDY AND MECHANISM

1983 ◽  
Vol 14 (44) ◽  
Author(s):  
J. Y. JEZEQUEL ◽  
F. BARONNET ◽  
M. NICLAUSE
Keyword(s):  
Experimental Study ◽  
Initial Stage

scholarly journals Experimental study of the initial stage of oil spread on calm water.

1980 ◽  
Vol 13 (5) ◽  
pp. 417-419 ◽  
Author(s):  
TETSUO AKIYAMA ◽  
TAKAHIRO NISHIOKA ◽  
HIROMI BABA ◽  
SATORU MITSUMORI ◽  
Kozo KOIDE
Keyword(s):  
Experimental Study ◽  
Initial Stage ◽  
Calm Water

Evolution of Surface Morphology During Cu(TMVS)(hfac) Sourced Copper CVD

2000 ◽  
Vol 612 ◽  
Author(s):  
Daewon Yang ◽  
Jongwon Hong ◽  
Timothy S. Cale
Keyword(s):  
Experimental Study ◽  
Water Vapor ◽  
Surface Morphology ◽  
Short Range ◽  
Nucleation And Growth ◽  
Growth Stages ◽  
Grain Sizes ◽  
Initial Stage ◽  
Afm Analysis ◽  
Evolving Surface

AbstractIn this paper, we describe an experimental study of the nucleation and growth stages during Cu(TMVS)(hfac) sourced Cu CVD on TaN substrates. In particular, we have investigated the effects of water vapor as a co-reactant on evolving surface morphology. The results of short (less than 10 s) depositions without/with water vapor indicate that water vapor helps to reduce the incubation time and to enhance the nuclei formation, uniformity, and adhesion (based on AFM analysis). Introducing water vapor during only the initial stage of deposition results in lower roughnesses, larger grain sizes, and lower short-range roughnesses as compared to the films deposited without water vapor. From this study, we conclude that water vapor enhances Cu nucleation and that a relatively small amount of water vapor before or during the initial stage of deposition improves surface morphology in terms of roughness and grain size.

The Experimental Study on Consolidation of RTV for Wet-Area Earthen Ruins in Southwest China

2013 ◽  
Vol 457-458 ◽  
pp. 32-35
Author(s):  
Yi Wu
Keyword(s):  
Physical Chemistry ◽  
Experimental Study ◽  
Compressive Strength ◽  
Southwest China ◽  
Sichuan Province ◽  
Soil Samples ◽  
East China ◽  
The Earth ◽  
Initial Stage ◽  
Experimental Researches

It is a worldwide difficulty to preserve earth monument in wet area. To solve this problem, Physical Chemistry Institute of Zhejiang University in China developed a consolidation agent named RTV (organopolysiloxanes+tetraethylorthosilicate). But the study on this consolidation agent is still in its initial stage at present for most of its experimental researches are limited to east china and no research reports aimed at wet area in southwest China were found so far. To check out the efficiency of this consolidation agent for earth in wet area, southwest China, a consolidating experiment was conducted by applying this consolidation agent to soil samples from kiln Qionglai earthen monuments located in outskirt of Chengdu city, the capital of Sichuan province. In this experiment, the changes of weight, permeating speed and depth and compressive strength of specimens after consolidating were investigated and compared with those for northwest area. The study shows that RTV consolidation agent developed by Physical Chemistry Institute of Zhejiang University is also effective to a certain degree for the earth monument in wet area, southwest China.

The Experimental Study on Consolidation of Acrylic Non-Aqueous Dispersion for Kiln Qionglai Monuments in Chengdu, China

2013 ◽  
Vol 689 ◽  
pp. 368-371
Author(s):  
Wu Yi ◽  
Bing Jiang ◽  
Bin Jia
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Southwest China ◽  
Aqueous Dispersion ◽  
Northwest China ◽  
Soil Samples ◽  
The Earth ◽  
Initial Stage ◽  
Hydrolysis Resistance ◽  
Experimental Researches

It is difficult to preserve earth monument in wet area. To solve this problem, a Chinese scholar, professor Zhou Shuanglin, developed a consolidation agent named acrylic non-aqueous dispersion. But the study on this consolidation agent is still in its initial stage, most of its experimental researches are limited to northwest china and no research reports aimed at southwest China wet area were found so far. To check out the efficiency of this consolidation agent in wet area, southwest China, a consolidating experiment was conducted by applying this consolidation agent to soil samples from kiln Qionglai earthen monuments located in outskirt of Chengdu city, the capital of Sichuan province. In this experiment, the changes of color, compressive strength and hydrolysis resistance of specimens after consolidating were investigated and compared with those for northwest area. The study shows that acrylic non-aqueous dispersion consolidation agent developed by professor Zhou Shuanglin is also effective to a certain degree for the earth monument in wet area, southwest China.

Interaction of Hf Precursor with H2O-terminated Si(001): First Principles Study

2009 ◽  
Vol 1155 ◽  
Author(s):  
Dae-Hyun Kim ◽  
Dae-Hee Kim ◽  
Hwa-Il Seo ◽  
Yeong-Cheol Kim
Keyword(s):  
Experimental Study ◽  
First Principles ◽  
Density Functional ◽  
Room Temperature ◽  
Atomic Layer ◽  
Functional Theory ◽  
The Third ◽  
Layer Deposition ◽  
Initial Stage ◽  
Dissociation Temperature

AbstractWe investigated the reaction of HfCl4 molecules with a H2O terminated Si (001)-2×1 surface using density functional theory to understand the initial stage of atomic layer deposition (ALD) of HfO2. Half monolayer of H2O molecules were adsorbed on the buckled-down Si atoms of the Si dimers of the Si (001)-2×1 surface below the dissociation temperature of H2O and were dissociated into H and OH at room temperature. This process could make uniform and well-aligned −H and −OH’s on the Si (001) substrate. The reaction of a HfCl4 molecule was more favorable with -OH than -H. The reaction of the HfCl4 molecule with the -OH generated a HCl molecule, and the remaining HfCl3 was attached to the O atom. The first reaction of the HfCl4 molecule with −OH produced 0.21 eV energy benefit. The reaction of the second HfCl4 molecule with the most adjacent −OH of the first one produced 0.28 eV energy benefit. The third and fourth molecules showed same tendency with the first and second ones. The energy differences of the fifth and sixth HfCl4 reactions were -0.01 eV, 0.06 eV, respectively. Therefore, we found that the saturation Hf coverage was approximately 5/8 of the available −OH's, which was 2.08 × 1014 Hf/cm2. The result was well-matched with the experimental study of other group.

scholarly journals DEVELOPMENT OF DIALOGUE COMPETENCE IN CHILDREN WITH GENERAL SPEECH DISORDER

2020 ◽  
Vol 17 ◽  
Author(s):  
Diyana Georgieva ◽  
Gencho Valchev
Keyword(s):  
Social Support ◽  
Experimental Study ◽  
Preschool Children ◽  
Empirical Research ◽  
Preschool Education ◽  
Speech Development ◽  
Speech Disorder ◽  
Low Level ◽  
Initial Stage ◽  
Educational Structures

The main core of activity in organized preschool education is the formation of dialogic competence, due to the key position it occupies in the initial stage of speech development in children. The article is devoted to an experimental study aimed at establishing the level of dialogic competence development in preschool children with general speech underdevelopment. Participants in the experiment were 16 children (9 girls and 7 boys) aged 4 to 7 years, trained in educational structures for social support. The obtained results showed that the low level of dialogic competence is the main dominant in the current empirical research.

scholarly journals The volume of changes in the nature of evocative reactions under the influence of music

1912 ◽  
Vol XIX (4) ◽  
pp. 685-734
Author(s):  
I. N. Spirtov
Keyword(s):  
Experimental Study ◽  
Broad Sense ◽  
Experimental Development ◽  
Initial Stage ◽  
Experimental Works ◽  
The Subject ◽  
Theoretical Side

The literature on music, which develops its theoretical and aesthetic side, is known to be very extensive, while, of course, the question of its influence on the psyche is also interpreted, but from a predominantly theoretical side; the experimental study of this influence, even understanding the word experimental in a broad sense, is still in the initial stage and the author in the literature available to him, among the small number of experimental works related to this, did not find a single one that would be devoted to the experimental development of the issue that constitutes the subject of this study.

Experimental study of the initial stage of Li2SO4·H2O single crystal dehydration in vacuum

1989 ◽  
Vol 39 (2) ◽  
pp. 345-350 ◽  
Author(s):  
V. B. Okhotnikov ◽  
N. A. Simakova ◽  
B. I. Kidyarov
Keyword(s):  
Experimental Study ◽  
Single Crystal ◽  
Initial Stage

Experimental Study of the Mechanical Behavior of Materials under Transient Regimes of Superplastic Deforming

2012 ◽  
Vol 735 ◽  
pp. 232-239 ◽  
Author(s):  
Olga I. Bylya ◽  
Rudolf Vasin ◽  
Peter Chistyakov ◽  
Anatoly Muravlev
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Experimental Analysis ◽  
Constitutive Equations ◽  
Superplastic Deformation ◽  
Coarse Grained ◽  
Stress Strain ◽  
Transient Regimes ◽  
Initial Stage ◽  
Microstructure Of The Material

Transient regimes of deforming are always present in any technological process and can be taken into account and used more widely if properly studied. The behavior of the materials under such regimes is becoming even more interesting if initial microstructure is coarse grained and undergoes transformation in the process of deforming. One of the transient processes which happen in any Superplastic deformation is the initial stage of loading, before steady superplastic flow starts. Initial parts of stress-strain curves during superplastic deformation are not frequently studied experimentally but provide very important information about mechanical properties of material. They are also necessary for development and verification of the constitutive equations. The results of experimental analysis of the behaviour of titanium alloys under superplastic conditions at the initial stages of loading and also under unloading are presented here. Another type of transient regimes of deforming is represented by the strain rate jumps. In such kind of experiments if the amplitudes of the jumps are big enough, the shifts of the corresponding parts of the stress-strain curves about the basic ones (hardening or softening) can be observed depending on the amplitude of the jump and microstructure of the material. Some experimental results related to this effect are discussed in this paper. The applicability of some constitutive equations for description of the observed results is discussed. The necessity of involving visco-elastic properties of material for proper description of its behavior in some regimes of deforming is also mentioned.

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