scholarly journals Contact Formation on Silicon Carbide by Use of Nickel and Tantalum in a Materials Science Point of View

10.5772/14601 ◽  
2011 ◽  
Author(s):  
Yu Cao ◽  
Lars Nyborg
Keyword(s):  
Silicon Carbide ◽  
Materials Science ◽  
Point Of View ◽  
Contact Formation

Theory of quantum chemistry

2021 ◽  
Author(s):  
Viktor Kostyukov
Keyword(s):  
Quantum Chemistry ◽  
Undergraduate Students ◽  
Materials Science ◽  
Relativistic Quantum ◽  
Point Of View ◽  
Educational Institutions ◽  
Federal State ◽  
Chemical Effects ◽  
Resource Intensity ◽  
State Educational

The textbook summarizes the basic theories of quantum chemistry. A comparative analysis of the computational efficiency of computational algorithms implementing these theories from the point of view of the ratio "accuracy — resource intensity" is performed. Considerable attention is paid to the problem of accounting for electronic correlation, as well as relativistic quantum chemical effects. Meets the requirements of the federal state educational standards of higher education of the latest generation. It is intended for undergraduate students of higher educational institutions; it can be used by graduate students studying materials science, structural, organic and physical chemistry, molecular biology and biophysics, biotechnology.

scholarly journals Dynamic Equilibria in Statistical and Nonlinear Physics of Uniform Stress Rotating Space Elevators (USRSE)

2019 ◽  
Vol 11 (6) ◽  
pp. 56
Author(s):  
Leonardo Golubovic ◽  
Steven Knudsen
Keyword(s):  
Carbon Nanotubes ◽  
Materials Science ◽  
Dynamic Equilibrium ◽  
Outer Space ◽  
Point Of View ◽  
Uniform Stress ◽  
The Earth ◽  
Equilibrium Configurations ◽  
Space Elevators ◽  
Dynamic Equilibria

The discovery of ultra-strong materials such as carbon nanotubes and diamond nano-thread structures has recently motivated an enhanced interest for the physics of Space Elevators connecting the Earth with outer space. A new concept has recently emerged in space elevator physics: Rotating Space Elevators (RSE) [Golubović, L. & Knudsen, S. (2009). Classical and statistical mechanics of celestial scale spinning strings: Rotating space elevators. Europhysics Letters 86(3), 34001.]. Objects sliding along rotating RSE string (sliding climbers) do not require internal engines or propulsion to be transported from the Earth's surface into outer space. Here we address the physics of a special RSE family, Uniform Stress Rotating Space Elevators (USRSE), characterized by constant tensile stress along the string. From the point of view of materials science, this condition provides the best control of string’s global integrity. We introduce an advanced analytic approach to obtain the dynamic equilibrium configurations of USRSE strings. We use our results to discuss the applications of USRSE for spacecraft launching.

FORMATION OF SILICON CARBIDE COATINGS BY CHEMICAL VAPOR DEPOSITION (review). Part 1

2021 ◽  
pp. 100-111
Author(s):  
D.V. Sidorov ◽  
◽  
A.A. Schavnev ◽  
A.A. Melentev ◽  
◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Point Of View ◽  
Technological Parameters ◽  
Technical Literature ◽  
Pure Silicon ◽  
Carbide Coatings ◽  
Complex Process

The article provides an overview of the scientific and technical literature in the field of the formation of silicon carbide coatings by chemical vapor deposition (CVD). CVD is a complex process, approaches to which vary depending on the tasks being solved. Depending on the technological parameters, the initial reagents, the substrate for deposition, the type and design of the CVD reactors, it is possible to achieve both the deposition of pure silicon carbide and the co-deposition of silicon and/or carbon. In the first part of the article, attention is paid to the study of CVD from the point of view of the mechanisms of chemical reactions, the design of the deposition apparatus, the substrates for deposition.

Use of Niobium Oxide as a Binder in the Production of Diamond Nanostructured Composites

2012 ◽  
Vol 727-728 ◽  
pp. 924-928
Author(s):  
Ana Lúcia Diegues Skury ◽  
Guerold Sergueevitch Bobrovinitchii ◽  
Marcia G. de Azevedo ◽  
Sérgio Neves Monteiro
Keyword(s):  
Niobium Oxide ◽  
Materials Science ◽  
Ceramic Materials ◽  
Point Of View ◽  
General Notion ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Diamond Crystals ◽  
Diamond Nanopowder ◽  
Graphite Structure

The sintering of nanodiamond powders is of interest for both applied engineering of tool materials and fundamental materials science of nanodisperse covalent-type ceramic materials. It is a accept as a general notion that the driving force for sintering of monophase particles is determined by the level of the surface energy. In the case of diamond nanopowder, this level must be significantly higher which makes sintering a difficult process. This difficulty of sintering is connected with the low diffusive mobility of carbon causing the formation of a graphite structure onto surface of the diamond crystals. From this point of view the use of niobium oxide as a binder could be a solution. In an attempt to inhibit the diamonds graphitization process, Nb2O5 and small amounts of amorphous carbon were introduced in the reaction zone. Sintering process was conducted at 6.0 GPa of pressure and 1100-1400oC for a processing time of 30 seconds. At the end of the process, the samples were cleaned, and prepared to be characterized by X-ray diffraction, scanning electron microscopy, density and porosity. From these results it was proposed a densification mechanism based on the consolidation of the particle by diffusion and coalescence of clusters.

Research on Recycled Materials in Public Art

2013 ◽  
Vol 329 ◽  
pp. 71-74 ◽  
Author(s):  
Mei Lin Huo
Keyword(s):  
Public Art ◽  
Materials Science ◽  
Point Of View ◽  
Renewable Materials ◽  
Recycled Materials ◽  
The Public ◽  
The Arts ◽  
Ecological Concepts ◽  
The Status ◽  
Art Research

Public art" of the recycled material in the context of globalization is formed under modern ecological concepts, environmental movement, and artistic experiments together. It will change the status quo of the lack of dialogue between materials science with art, recycled materials from the point of view of public art, research and development, and applications make proactive in environmental design. In this study, "renewable materials" mainly focused on the public art materials field, its scope and methods of public art. Recycled materials include not only well-known natural renewable materials, but also include man-made biodegradable materials and life industrial recycled materials, which greatly enriched the scope of public art materials, and reflect the public geographical characteristics and diversity of the arts.

scholarly journals Astromimetics

2018 ◽  
Vol 5 ◽  
pp. 184954351879434 ◽  
Author(s):  
Vuk Uskoković ◽  
Victoria M Wu
Keyword(s):  
Materials Science ◽  
Fine Particles ◽  
Great Majority ◽  
Point Of View ◽  
Iron Core ◽  
Colloidal Form ◽  
The Earth ◽  
Celestial Bodies ◽  
Intended Use

Composite, multifunctional fine particles are likely to be at the frontier of materials science in the foreseeable future. Here we present a submicron composite particle that mimics the stratified structure of the Earth by having a zero-valent iron core, a silicate/silicide mantle, and a thin carbonaceous crust resembling the biosphere and its biotic deposits. Particles were formulated in a stable colloidal form and made to interact with various types of healthy and cancer cells in vitro. A selective anticancer activity was observed, promising from the point of view of the intended use of the particles for tumor targeting across the blood–brain barrier. As an extension of the idea underlying the fabrication of a particle mimicking the planet Earth, we propose a new field of mimetics within materials science: astromimetics. The astromimetic approach in the context of materials science consists of the design of particles after the structure of celestial bodies. With Earth being the most chemically diverse and fertile out of all the astral bodies known, it is anticipated that the great majority of astromimetic material models will fall in the domain of geo-inspired ones.

PREPARATION AND MORPHOLOGY OF POROUS NANOCALCIUM PHOSPHATE/POLY(L-LACTIC ACID) COMPOSITES

2005 ◽  
Vol 04 (04) ◽  
pp. 517-523
Author(s):  
WENJIAN WENG ◽  
YANBO GAO ◽  
LILI PAN ◽  
YANBAO LI ◽  
PIYI DU ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Lactic Acid ◽  
Calcium Phosphate ◽  
Tricalcium Phosphate ◽  
Materials Science ◽  
Calcium Phosphates ◽  
Point Of View ◽  
Thermally Induced Phase Separation ◽  
Thermally Induced ◽  
Highly Porous

Biodegradable porous materials can serve as a scaffold in tissue engineering. In this work, highly porous nano-calcium phosphate (NCP)/poly(L-lactic acid)(PLLA) composites were prepared by a thermally induced phase separation technique. Five calcium phosphates with different biodegradation rate were selected, i.e. amorphous calcium phosphate, α-tricalcium phosphate, β-tricalcium phosphate and biphasic α/β-tricalcium phosphate. The results showed that the NCP particles could be homogenously incorporated into pore walls; the composites had a porosity of ~90%, and a pore size of ~200 μm. From the point of view of materials science, the obtained porous NCP/PLLA composites demonstrate to have a capability of applying in bone tissue engineering.

Sign in / Sign up

Export Citation Format

Share Document