Theoretical Investigation of Equilibrium Properties of the Yukawa Fluid in a Wide Range of Parameters

2018 ◽  
Vol 127 (6) ◽  
pp. 1153-1164 ◽  
Author(s):  
V. V. Reshetniak ◽  
A. N. Starostin ◽  
A. V. Filippov
Keyword(s):  
Theoretical Investigation ◽  
Wide Range ◽  
Yukawa Fluid

A Theoretical Approach to the Combustion of Fuel-Alcohol Blends

1985 ◽  
Vol 107 (4) ◽  
pp. 902-907 ◽  
Author(s):  
G. Cau ◽  
M. P. Pelagagge
Keyword(s):  
Total Energy ◽  
Theoretical Investigation ◽  
Theoretical Approach ◽  
Total Mass ◽  
Internal Combustion Engines ◽  
Combustion Temperature ◽  
Analytical Procedure ◽  
Combustion Engines ◽  
Constant Mass ◽  
Wide Range

This paper is concerned with the results of a theoretical investigation on combustion of traditional fuel and alcohol blends. An analytical procedure has been developed which examines three different hypotheses for introducing the alcohol: constant mass of primary fuel, constant total energy of fuel, and constant total mass of fuel. The procedure has been applied to combustion at constant volume varying over a wide range of air-fuel ratios, percentage of alcohol, and combustion temperature. The results obtained, of particular interest for reciprocating internal combustion engines, indicate that as far as energy and emissions are concerned, the effects of alcohol on combustion depend strongly on the hypothesis adopted for fueling the alcohol.

scholarly journals An experimental, theoretical and kinetic-modeling study of the gas-phase oxidation of ammonia

2020 ◽  
Vol 5 (4) ◽  
pp. 696-711 ◽  
Author(s):  
Alessandro Stagni ◽  
Carlo Cavallotti ◽  
Suphaporn Arunthanayothin ◽  
Yu Song ◽  
Olivier Herbinet ◽  
...  
Keyword(s):  
Kinetic Model ◽  
Gas Phase ◽  
Theoretical Investigation ◽  
Kinetic Modeling ◽  
Ammonia Gas ◽  
Wide Range ◽  
Phase Oxidation ◽  
Detailed Kinetic Model ◽  
Gas Phase Oxidation ◽  
Modeling Study

A wide-range experimental and theoretical investigation of ammonia gas-phase oxidation is performed, and a predictive, detailed kinetic model is developed.

scholarly journals Transverse Patterns in the Bistable Resonant Tunneling Systems Under Ballistic Lateral Transport

VLSI Design ◽  
1998 ◽  
Vol 8 (1-4) ◽  
pp. 481-487
Author(s):  
V. A. Kochelap ◽  
B. A. Glavin ◽  
V. V. Mitin
Keyword(s):  
Numerical Simulations ◽  
Theoretical Investigation ◽  
Resonant Tunneling ◽  
Tunneling Current ◽  
Small Region ◽  
Variational Procedure ◽  
Lateral Transport ◽  
Double Barrier ◽  
Wide Range ◽  
Bistability Region

We report the theoretical investigation of the phenomenon of the formation of patterns transverse to the tunneling current in resonant tunneling double-barrier heterostructures in the case of wide range of bistable voltages. In contrast to the case of the patterns in the structures with small region of bistability, for pronounced bistability electron lateral transport is strongly nonlocal. We performed numerical simulations of the stationary and mobile patterns using special variational procedure. Our results revealed that though the possible types of patterns remains the same as for the structures with small bistability region, their characteristics are modified considerably.

scholarly journals River Channel Forms in Relation to Bank Steepness: A Theoretical Investigation Using a Variational Analytical Method

Water ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1250
Author(s):  
Jinsheng Fan ◽  
Heqing Huang ◽  
Guoan Yu ◽  
Teng Su
Keyword(s):  
Theoretical Investigation ◽  
Cross Sections ◽  
Empirical Studies ◽  
River Channel ◽  
Hydraulic Geometry ◽  
Bank Angle ◽  
Sediment Size ◽  
Threshold Theory ◽  
Wide Range ◽  
Alluvial Channel

Riverbanks vary considerably in anti-scourability and consequently take various profiles. By using an isosceles trapezoid as the generalized form of river channel cross-sections and then incorporating the effects of bank angle into the variational analytical approach developed by Huang and Nanson (2000), this study presents a detailed theoretical investigation of the self-adjustment of alluvial channel forms. It is demonstrated that when alluvial channel flow achieves stable equilibrium, a significant decrease in riverbank steepness leads to a slight decrease in maximum sediment (bedload) discharge, and yet results in a significant increase in optimal channel width and a considerable decrease in optimal channel depth. The hydraulic geometry relations, theoretically derived for bank steepness to vary across a wide range, show that among the multivariant controls, the roles of bed sediment size, channel roughness, flow discharge and sediment (bedload) discharge are independent of bank steepness. While the effects of bank steepness illustrated in the theoretically derived hydraulic geometry relations are highly consistent with the results of threshold theory and previous empirical studies, limitations on using bank angle to reflect the anti-scourability of natural riverbanks are also highlighted.

Simulation of the Onset of Gas Entrainment From a CANDU Reactor Channel Under LOCA Conditions: II

2005 ◽  
Author(s):  
T. Ahmad ◽  
I. Hassan
Keyword(s):  
Experimental Data ◽  
Experimental Investigation ◽  
Theoretical Investigation ◽  
Numerical Models ◽  
Reactor Channel ◽  
Gas Entrainment ◽  
Single Discharge ◽  
Wide Range

An experimental investigation has been carried out to simulate the onset of gas entrainment phenomenon from a stratified region through branches located on a semi-circular wall configuration, in close dimensional resemblance with a CANDU header-feeder system. New experimental data for the onset of gas entrainment was developed during single and multiple discharge from an air/water stratified region over a wide range of Froude numbers (0 to 100), in order to thoroughly understand the onset of gas entrainment phenomenon. The present data is necessary in validating the analytical and numerical models of the onset of gas entrainment, particularly at low Froude numbers. Part I of this paper, Andaleeb et al. (2005), provides the theoretical investigation of the single discharge case.

scholarly journals Solid-State Reactions for the Storage of Thermal Energy

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 226 ◽  
Author(s):  
Stefania Doppiu ◽  
Jean-Luc Dauvergne ◽  
Elena Palomo del Barrio
Keyword(s):  
Energy Storage ◽  
Solid State ◽  
Theoretical Investigation ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Synthesis Method ◽  
Solid State Reactions ◽  
Total Oxidation ◽  
Wide Range ◽  
Selection Of

In this paper, the use of solid-state reactions for the storing of thermal energy at high temperature is proposed. The candidate reactions are eutectoid- and peritectoid-type transitions where all the components (reactants and reaction products) are in the solid state. To the best of our knowledge, these classes of reactions have not been considered so far for application in thermal energy storage. This study includes the theoretical investigation, based on the Calphad method, of binary metals and salts systems that allowed to determine the thermodynamic properties of interest such as the enthalpy, the free energy, the temperature of transition, the volume expansion and the heat capacity, giving guidelines for the selection of the most promising materials in view of their use for thermal energy storage applications. The theoretical investigation carried out allowed the selection of several promising candidates, in a wide range of temperatures (300–800 °C). Moreover, the preliminary experimental study and results of the binary Mn-Ni metallic system are reported. This system showed a complex reacting behavior with several discrepancies between the theoretical phase diagram and the experimental results regarding the type of reaction, the transition temperatures and enthalpies and the final products. The discrepancies observed could be due both to the synthesis method applied and to the high sensitivity of the material leading to partial or total oxidation upon heating even if in presence of small amount of oxygen (at the ppm level).

Recent Applications of High Resolution Electron Microscopy to Crystalline Arrays of Virus Particles

1978 ◽  
Vol 36 (3) ◽  
pp. 470-482 ◽  
Author(s):  
R.W. Horne
Keyword(s):  
Electron Microscopy ◽  
Image Processing ◽  
Analytical Techniques ◽  
Staining Technique ◽  
High Resolution Electron Microscopy ◽  
Optical Diffraction ◽  
Full Potential ◽  
Virus Particles ◽  
Resolution Electron ◽  
Wide Range

The technique of surrounding virus particles with a neutralised electron dense stain was described at the Fourth International Congress on Electron Microscopy, Berlin 1958 (see Home & Brenner, 1960, p. 625). For many years the negative staining technique in one form or another, has been applied to a wide range of biological materials. However, the full potential of the method has only recently been explored following the development and applications of optical diffraction and computer image analytical techniques to electron micrographs (cf. De Hosier & Klug, 1968; Markham 1968; Crowther et al., 1970; Home & Markham, 1973; Klug & Berger, 1974; Crowther & Klug, 1975). These image processing procedures have allowed a more precise and quantitative approach to be made concerning the interpretation, measurement and reconstruction of repeating features in certain biological systems.

Microfabrication research at the National Submicron Facility

1983 ◽  
Vol 41 ◽  
pp. 86-89
Author(s):  
E.D. Wolf
Keyword(s):  
Integrated Circuits ◽  
Particle Physics ◽  
High Speed ◽  
New Technology ◽  
High Energy ◽  
High Energy Particle ◽  
New Science ◽  
Wide Range ◽  
Intermediate Domain ◽  
Circuit Function

Most microelectronics devices and circuits operate faster, consume less power, execute more functions and cost less per circuit function when the feature-sizes internal to the devices and circuits are made smaller. This is part of the stimulus for the Very High-Speed Integrated Circuits (VHSIC) program. There is also a need for smaller, more sensitive sensors in a wide range of disciplines that includes electrochemistry, neurophysiology and ultra-high pressure solid state research. There is often fundamental new science (and sometimes new technology) to be revealed (and used) when a basic parameter such as size is extended to new dimensions, as is evident at the two extremes of smallness and largeness, high energy particle physics and cosmology, respectively. However, there is also a very important intermediate domain of size that spans from the diameter of a small cluster of atoms up to near one micrometer which may also have just as profound effects on society as “big” physics.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

Observation of Atom Rows in Thorium Pyromellitate Using a Field Emission STEM

1977 ◽  
Vol 35 ◽  
pp. 80-81
Author(s):  
H. Todokoro ◽  
S. Nomura ◽  
T. Komoda
Keyword(s):  
Field Emission ◽  
Amorphous Carbon ◽  
Carbon Film ◽  
Dark Field Image ◽  
Dark Field ◽  
Amorphous Carbon Film ◽  
Atomic Size ◽  
Wide Range ◽  
A Chain

It is interesting to observe polymers at atomic size resolution. Some works have been reported for thorium pyromellitate by using a STEM (1), or a CTEM (2,3). The results showed that this polymer forms a chain in which thorium atoms are arranged. However, the distance between adjacent thorium atoms varies over a wide range (0.4-1.3nm) according to the different authors.The present authors have also observed thorium pyromellitate specimens by means of a field emission STEM, described in reference 4. The specimen was prepared by placing a drop of thorium pyromellitate in 10-3 CH3OH solution onto an amorphous carbon film about 2nm thick. The dark field image is shown in Fig. 1A. Thorium atoms are clearly observed as regular atom rows having a spacing of 0.85nm. This lattice gradually deteriorated by successive observations. The image changed to granular structures, as shown in Fig. 1B, which was taken after four scanning frames.

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