Microstructural Evolution of Epitaxial MgAl2O4 Thin Films Derived From Metal Nitrates and From Metal Alkoxides

1993 ◽  
Vol 317 ◽  
Author(s):  
Man Faing ◽  
Michael J. Cima
Keyword(s):  
Dielectric Material ◽  
Processing Parameters ◽  
Magnesium Aluminate ◽  
Metal Alkoxides ◽  
Average Surface Roughness ◽  
Metal Nitrates ◽  
Nitrate Precursor ◽  
Metalorganic Deposition ◽  
The Relationship ◽  
Lattice Matched

ABSTRACTMagnesium aluminate (MgAl2O4) is a potential dielectric material in Ba2YCu3O7−x (BYC) devices. In the present study, epitaxial MgAl2O4 films were deposited on (100) SrTiO3 single crystal substrates by pyrolysis of chemical precursors. Two precursors were used: one was a mixed nitrate precursor, and the other was MgAl2(OC3H7)8. Crystallization of MgAl2O4 on lattice-Matched substrates is observed at 700°C. The average surface roughness of these MgAl2O4 films is about 6Å. These chemically-derived MgAl2O4 films have demonstrated the potential for planarization by metalorganic deposition. The relationship between the processing parameters and the surface morphology of these MgAl2O4 films will be discussed.

Epitaxial Chemically Derived Lanthanum Aluminate Films for Ba2YCu3O7−x Devices

1993 ◽  
Vol 317 ◽  
Author(s):  
Man Faing ◽  
Michael J. Cima
Keyword(s):  
Substrate Material ◽  
Zero Field ◽  
Ybco Films ◽  
Lanthanum Aluminate ◽  
Transmission Electron ◽  
Nitrate Precursor ◽  
Metalorganic Deposition ◽  
Current Densities ◽  
Higher Temperature ◽  
Lattice Matched

ABSTRACTLanthanum aluminate (LaAlO3) has been used as a substrate material for depositing Ba2YCu3O7−x (YBCO) films. In the present study, chemically derived epitaxial LaAlO3 thin films were used for depositing epitaxial YBCO films. These epitaxial LaAlO3 films were deposited on both (100) SrTiO3 and (100) LaAlO3 single crystal substrates by pyrolysis of a mixed nitrate precursor. Crystallization of LaAlO3 on lattice-Matched substrates occurs at below 650°C, whereas crystallization on non lattice-Matched substrates occurs at much higher temperature. The average surface roughness of these LaAlO3 films can be as low as 7Å. The YBCO films derived from metalorganic deposition of metal trifluoroacetate precursors were deposited on these epitaxial LaAlO3 films on SrTiO3 substrates. The resultant YBCO films have critical current densities of > 2 × 106 A/cm2 at 77K and zero field. Transmission electron microscopy of these films shows that they are highly epitaxial yet have pore of about 15–30 nm in size. Chemically derived LaAlO3 films also were used to planarize stepped substrates.

Adaptation and Personalization of Web-Based Multimedia Content

2006 ◽  
pp. 284-304 ◽  
Author(s):  
Panagiotis Germanakos ◽  
Constantinos Mourlas
Keyword(s):  
Cognitive Processing ◽  
Service Providers ◽  
User Profile ◽  
Processing Parameters ◽  
Multimedia System ◽  
Multimedia Content ◽  
Web Based ◽  
Three Layer Architecture ◽  
The Subject ◽  
The Relationship

A traditional multimedia system presents the same static content and suggests the same next page to all users, even though they might have widely differing knowledge of the subject. Such a system suffers from an inability to be all things to all people, especially when the user population is relatively diverse. The rapid growth of mobile and wireless communication allowed service providers to develop new ways of interactions, enabling users to become accustomed to new means of multimedia-based service consumption in an anytime, anywhere, and anyhow manner. This chapter investigates the new multi-channel constraints and opportunities emerged by these technologies, as well as the new user-demanding requirements that arise. It further examines the relationship between the adaptation and personalization research considerations, and proposes a three-layer architecture for adaptation and personalization of Web-based multimedia content based on the “new” user profile, with visual, emotional, and cognitive processing parameters incorporated.

scholarly journals Alloying and Processing Effects on the Microstructure, Mechanical Properties, and Degradation Behavior of Extruded Magnesium Alloys Containing Calcium, Cerium, or Silver

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 391 ◽  
Author(s):  
Jan Bohlen ◽  
Sebastian Meyer ◽  
Björn Wiese ◽  
Bérengère J. C. Luthringer-Feyerabend ◽  
Regine Willumeit-Römer ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloys ◽  
Processing Parameters ◽  
Second Phase ◽  
Degradation Behavior ◽  
Microstructure Development ◽  
Corrosion Properties ◽  
Second Phase Particles ◽  
Degradation Rates ◽  
The Relationship

Magnesium alloys attract attention as degradable implant materials due to their adjustable corrosion properties and biocompatibility. In the last few decades, especially wrought magnesium alloys with enhanced mechanical properties have been developed, with the main aim of increasing ductility and formability. Alloying and processing studies allowed demonstrating the relationship between the processing and the microstructure development for many new magnesium alloys. Based on this experience, magnesium alloy compositions need adjustment to elements improving mechanical properties while being suitable for biomaterial applications. In this work, magnesium alloys from two Mg-Zn series with Ce (ZE) or Ca (ZX) as additional elements and a series of alloys with Ag and Ca (QX) as alloying elements are suggested. The microstructure development was studied after the extrusion of round bars with varied processing parameters and was related to the mechanical properties and the degradation behavior of the alloys. Grain refinement and texture weakening mechanisms could be improved based on the alloy composition for enhancing the mechanical properties. Degradation rates largely depended on the nature of second phase particles rather than on the grain size, but remained suitable for biological applications. Furthermore, all alloy compositions exhibited promising cytocompatibility.

A Study on Chip Breakage in Mini-Pore Vibration Drilling for Hard-to-Cut Material of Austenitic Stainless Steel

2010 ◽  
Vol 455 ◽  
pp. 548-552
Author(s):  
J.S. Zhou ◽  
Bang Yan Ye ◽  
Xing Yu Lai
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Cutting Parameters ◽  
Processing Parameters ◽  
Chip Breaking ◽  
Vibration Drilling ◽  
On Chip ◽  
Vibration Parameters ◽  
The Relationship ◽  
Chip Breakage

This research aims to improve the method of Mini-pore Drilling superimposed an axis vibration for hard-to-cut material of Austenitic Stainless Steel 1Cr18Ni9Ti, as well as to make it easier for the chips to be discharged. A mathematical model of vibration drilling is presented, and the relationship between the vibration parameters and cutting parameters to generate little and short broken-chips in vibration drilling is investigated, analyzed and verified by experiments. The results show that when the processing parameters meet the conditions given in this article, stable and reliable chip-breaking can be achieved. The results provide a theoretical guidance to achieve chip-breaking in mini-pore vibration drilling for hard-to-cut material.

scholarly journals Modeling of geometry and insertion force of a new lancet medical needle

2019 ◽  
Vol 103 (1) ◽  
pp. 003685041989107
Author(s):  
Yingchun Qi ◽  
Jingfu Jin ◽  
Tingkun Chen ◽  
Qian Cong
Keyword(s):  
Great Influence ◽  
Large Change ◽  
Processing Parameters ◽  
Needle Insertion ◽  
Grinding Wheel ◽  
Insertion Force ◽  
Factors Affecting ◽  
Organ Tissue ◽  
Needle Insertion Force ◽  
The Relationship

Lancet needle is a typical medical treatment device. Its tip consists of two lancet planes and one bevel plane. When the lancet needle is inserted into soft organ tissue, the insertion force may influence the needle cutting direction and treatment effect and increase the pain. One of the main factors affecting this insertion force is the geometry of the needle tip. Based on the research on the shape and processing method of the conventional lancet needle, a new lancet needle tip geometry was obtained by adjusting the relative position of the grinding wheel to the needle. A mathematical model of this new lancet needle was established. The relationship between processing parameters and needle shape was analyzed, and the needle insertion force was predicted. Compared with the conventional lancet needle, the new lancet needle is sharper, and the insertion force on the cutting edge is smaller. However, this change in the grinding position of the needle lancet plane has a great influence on the shape of needle tip near the intersection of the bevel plane and the lancet plane. Some special second bevel angle and rotated angle will cause a large change in the specific force at the intersection place, which is not conducive to reducing the insertion force.

Influences of Processing Parameters on Hole Shape Accuracy in Drilling Carbon Fiber Reinforced Composite

2011 ◽  
Vol 325 ◽  
pp. 375-380 ◽  
Author(s):  
Gui Yu Li ◽  
Jian Feng Li ◽  
Jie Sun
Keyword(s):  
Production Efficiency ◽  
Processing Parameters ◽  
Frequency Domain Analysis ◽  
Defect Production ◽  
Shape Deviation ◽  
Shape Accuracy ◽  
Hole Shape ◽  
Reinforced Composite ◽  
Drilling Parameters ◽  
The Relationship

Drilling parameters have great influences on hole accuracy and defect production. In this study, single factor test is applied to obtain the relationship between the torque deviation and the spindle speed n at different feeds per revolution fr. White Light Interferometer (WLI) is applied to measure the hole shape. Based on the frequency domain analysis of torque deviation, the cause of hole shape deviation is investigated. Relationship between the hole shape accuracy and drilling parameters is established, which can be used to predict the hole shape by analyzing the torque deviation. Moreover, the reasonable processing parameters can be selected to obtain drilling hole with ideal shape and satisfying production efficiency.

Neural Model of the Producing Process for Predicting Filtration Properties of Melt Blowing Nonwovens

2012 ◽  
Vol 577 ◽  
pp. 47-50
Author(s):  
Bo Zhao
Keyword(s):  
Pore Structure ◽  
Neural Model ◽  
Processing Parameters ◽  
Physical Models ◽  
Modeling Technique ◽  
Ann Model ◽  
Melt Blowing ◽  
Filtration Properties ◽  
The Relationship

The filtration properties of melt blowing nonwovens are affected by the pore structure of nonwovens which is strongly related to the processing parameters. However, it is difficult to establish physical models on the relationship between the processing parameters and filtration properties. In this work, the ANN model is established for predicting the filtration properties of melt blowing nonwovens from the processing parameters. The results reveal that the ANN method is really an effective and viable modeling technique. This method can exactly predict the filtration properties because the results are good enough

scholarly journals Trajectory Prediction of Three Dimensional Forming Tube Based On Kalman Filter

2021 ◽  
Author(s):  
Jianjun Wu ◽  
Liang Bo ◽  
Junzhou Yang
Keyword(s):  
Kalman Filter ◽  
Spline Interpolation ◽  
Three Dimensional ◽  
Processing Parameters ◽  
Trajectory Prediction ◽  
Forming Process ◽  
Variable Curvature ◽  
Relevant Calculation ◽  
The Relationship ◽  
Initial Process

Abstract This article focuses on the prediction of forming trajectory and process optimization during the forming process for the variable curvature tubes. Firstly, through cubic B-spline interpolation, the geometric characteristics of the axis of the target tube are obtained. An overall tube is "separated and then integrated", and the relationship between geometric parameters and processing parameters is established to obtain the initial process parameters. Based on the Extended Kalman Filter (EKF) algorithm, the motion model and observation model of tube forming using simulation are presented section by section, and the relevant calculation and analysis are carried out. The forming trajectory has been predicted and the processing parameters are optimized during the processing process, in which the effectiveness of the processing optimum scheme is illustrated.

Parameter optimization of aluminum alloy thin structures obtained by Selective Laser Melting

MRS Advances ◽  
2019 ◽  
Vol 4 (55-56) ◽  
pp. 2997-3005
Author(s):  
Malena Ley Bun Leal ◽  
Barbara Bermudez-Reyes ◽  
Patricia del Carmen Zambrano Robledo ◽  
Omar Lopez-Botello
Keyword(s):  
Selective Laser Melting ◽  
Process Parameters ◽  
Orthogonal Design ◽  
Processing Parameters ◽  
Future Research ◽  
Laser Melting ◽  
Complex Process ◽  
The Relationship ◽  
Fabrication Parameters

ABSTRACTSelective Laser Melting (SLM) involves numerous fabrication parameters, the interaction between those parameters determine the final characteristics of the resulting part and because of the latter, it is considered a complex process. Low-density components is one of the main issues of the SLM process, due to the incorrect selection of process parameters. These defects are undesired in high specialized applications (i.e. aerospace, aeronautic and medical industries). Therefore, the characterization of the defects (pores) found in aluminum parts manufacture by SLM and the relationship with fabrication parameters was performed. A robust orthogonal design of experiments was implemented to determine process parameters, and then parts were manufactured in SLM. Relative density of the samples was then characterized using the Archimedes principle and microscopy; the data was then statistically analyzed in order to determine the optimal process parameters. The main purpose of the present research was to establish the best processing parameters of an in-house SLM system, as well as to characterize the pore geometry in order to fully eliminate pores in a future research.

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