scholarly journals Theoretical Model for Negative Differential Conductance in 2D Semiconductor Monolayers

2018 ◽  
Vol 63 (6) ◽  
pp. 527 ◽  
Author(s):  
V. G. Lytovchenko ◽  
A. I. Kurchak ◽  
M. V. Strikha
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Differential Conductance ◽  
Negative Differential Conductance ◽  
Practical Applications ◽  
Gunn Diodes ◽  
Simple Theoretical Model ◽  
New Generation ◽  
First Time ◽  
Ws2 Monolayer

A simple theoretical model of electron heating in a system with two valleys is applied for the first time to describe 2D semiconductor monolayers of the MoS2 and WS2 types. The model is demonstrated to describe sufficiently well the available experimental data on the negative differential conductance effect in a WS2 monolayer. It confirms a possibility to fabricate Gunn diodes of a new generation based on the structures concerned. Such diodes are capable of generating frequencies of an order of 10 GHz and higher, which makes them attractive for many practical applications.

A laboratory simulation of mixing across tidal fronts

1996 ◽  
Vol 309 ◽  
pp. 321-344 ◽  
Author(s):  
P. J. Thomas ◽  
P. F. Linden
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Laboratory Simulation ◽  
Shallow Sea ◽  
Mixing Rate ◽  
Tidal Front ◽  
Laboratory Results ◽  
The Cross ◽  
First Time ◽  
Oceanographic Conditions

A laboratory study which simulates the dynamics of shallow sea fronts and the mixing across a tidal front is described. The experiments show, for the first time, that it is possible to simulate a stationary tidal front with the inclusion of buoyancy effects, Coriolis effects and turbulence in the laboratory. Experimental data obtained for the cross-front mixing rate are presented. The data analysis shows that the mixing rate increases with stratification and decreases with rotation. A theoretical model of the flow which collapses the experimental data is developed which shows that the cross-front mixing is controlled by baroclinic processes. The model enables an extrapolation of the laboratory results to oceanographic conditions. Estimates of the cross-front mixing velocity for oceanographic conditions give values consistent with estimates obtained from North Sea data.

A theoretical model to study melting of metals under pressure

2015 ◽  
Vol 29 (27) ◽  
pp. 1550161 ◽  
Author(s):  
Kuldeep Kholiya ◽  
Jeewan Chandra
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Melting Temperature ◽  
Present Model ◽  
Melting Curve ◽  
Experimental Result ◽  
Thermal Equation ◽  
Simple Theoretical Model ◽  
Pressure Melting ◽  
Good Agreement

On the basis of the thermal equation-of-state a simple theoretical model is developed to study the pressure dependence of melting temperature. The model is then applied to compute the high pressure melting curve of 10 metals (Cu, Mg, Pb, Al, In, Cd, Zn, Au, Ag and Mn). It is found that the melting temperature is not linear with pressure and the slope [Formula: see text] of the melting curve decreases continuously with the increase in pressure. The results obtained with the present model are also compared with the previous theoretical and experimental data. A good agreement between theoretical and experimental result supports the validity of the present model.

Porosity and Effective Thermal Conductivity of Wire Screens

1990 ◽  
Vol 112 (1) ◽  
pp. 5-9 ◽  
Author(s):  
Won Soon Chang
Keyword(s):  
Experimental Data ◽  
Thermal Conductivity ◽  
Theoretical Model ◽  
Effective Thermal Conductivity ◽  
Present Model ◽  
Model Based ◽  
Wire Screen ◽  
Simple Theoretical Model ◽  
Parallel Conduction ◽  
The Wire

A simple theoretical model based on combined series and parallel conduction for the effective thermal conductivity of fluid-saturated screens has been developed. The present model has been compared with the existing correlations and experimental data available in literature, and it has been found that the model is effective in predicting thermal conductivity. The study also demonstrates that it is important to include the actual thickness of the wire screen in order to calculate the porosity accurately.

Notizen: Triplet Quenching by Oxygen in a Rhodamine 6G Laser

1973 ◽  
Vol 28 (5) ◽  
pp. 792-793 ◽  
Author(s):  
F. P. Schäfer ◽  
L. Ringwelski
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Output Power ◽  
Room Temperature ◽  
Rhodamine 6G ◽  
Laser Output Power ◽  
Simple Theoretical Model ◽  
Best Fit ◽  
Triplet Lifetime ◽  
Quenching By Oxygen

Measurements of dye laser output power vs. oxygen content of the dye solution are reported and compared with a simple theoretical model. The triplet lifetime of rhodamine 6G in oxygen-free methanol at room temperature is seen to lie between 1 and 100 μsec, with 2 μsec giving the best fit of the experimental data.

Size and shape dependence of Debye temperature and Raman frequency of nanomaterials

2015 ◽  
Vol 29 (04) ◽  
pp. 1550004
Author(s):  
Raghuvesh Kumar ◽  
Sandhya Bhatt ◽  
Munish Kumar
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Debye Temperature ◽  
Experimental Studies ◽  
Raman Frequency ◽  
Size And Shape ◽  
Shape Dependence ◽  
Simple Theoretical Model ◽  
Good Agreement

A simple theoretical model is developed to study the size and shape dependence of Debye temperature and Raman frequency of nanomaterial. We have studied the effect of size and shape on Debye temperature of nanocrystalline Fe , Co , Al and Ag . The model is extended to study the effect of size and shape on the Raman frequency of nanocrystalline SnO 2, CeO 2 and CdSe . The results obtained are compared with the available experimental data. A good agreement between the theory and experimental data supports the validity of the model developed. We also report the results for nanowire and nanofilm in the absence of experimental data, which may help the researchers engaged in the experimental studies.

High-Pressure Elastic Constant of Some Materials of Earth’s Mantle

2016 ◽  
Vol 71 (5) ◽  
pp. 433-437
Author(s):  
Quan Liu
Keyword(s):  
Experimental Data ◽  
High Pressure ◽  
Theoretical Model ◽  
Elastic Behaviour ◽  
Exponential Relationship ◽  
Earth’S Mantle ◽  
Simple Theoretical Model ◽  
Volume Dependence ◽  
Theoretical Investigations ◽  
Good Agreement

AbstractIn the present work, an exponential relationship for the volume dependence of the Anderson–Grüneisen parameter along isotherm and the formulation derived from Tallon’s model have been used to develop a simple theoretical model for the elastic constants as a function of pressure. Applying it to some materials of earth’s mantle at different pressure ranges, the calculated results are in good agreement with the earlier theoretical investigations and available experimental data and thus show that our theory can be applied for predicting the elastic behaviour of earth materials at high pressure.

scholarly journals Progressive Matrix Cracking in Composite Laminates Loaded in Tension

1992 ◽  
Vol 1 (1) ◽  
pp. 096369359200100 ◽  
Author(s):  
J Zhang ◽  
J Fan ◽  
C Soutis
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Crack Initiation ◽  
Composite Laminates ◽  
Matrix Cracking ◽  
Shear Lag ◽  
Simple Theoretical Model ◽  
Stiffness Properties ◽  
Progressive Matrix ◽  
Good Agreement

The reduction of stiffness properties due to transverse ply cracking in [μθ m/90 n] s laminates loaded in quasi-tension is examined theoretically. Predictions of a simple theoretical model based on a modified 2-D shear-lag analysis, are in good agreement with experimental data. The energy released as a result of matrix cracking is also calculated and used to predict crack initiation and multiplication.

scholarly journals Analysis of Equation of States for the Suitability at High Pressure: MgO as an Example

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Kuldeep Kholiya ◽  
Jeewan Chandra ◽  
Swati Verma
Keyword(s):  
Experimental Data ◽  
High Pressure ◽  
Theoretical Model ◽  
Present Model ◽  
Ultrahigh Pressure ◽  
Compression Behavior ◽  
Pressure Behavior ◽  
Equation Of States ◽  
Simple Theoretical Model ◽  
Murnaghan Equation

A simple theoretical model is developed to study the high pressure behavior of solids and is applied to evaluate the pressure for MgO in case of large compression along with Shanker, Tait, Vinet, and Birch-Murnaghan equation of states (EOSs). These EOSs are also tested for the basic requirements revealed from the fundamental thermodynamics for solids in the limit of extreme compressions, as given by Stacey. It is found that for the high pressure compression behavior of MgO the present model, Tait, Vinet, and Birch-Murnaghan EOSs give the results compatible with the experimental data. It has also been found that in the regime of ultrahigh pressure the present model and Birch-Murnaghan EOS satisfy the Stacey criterion.

The Immunoglobulin M Molecule: Isomeric Forms of the Monomer Subunit

1975 ◽  
Vol 53 (8) ◽  
pp. 923-929 ◽  
Author(s):  
M. E. Percy ◽  
J. R. Percy
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Heavy Chain ◽  
Immunoglobulin M ◽  
The Other ◽  
Heavy Chains ◽  
Novel Technique ◽  
Simple Theoretical Model ◽  
Covalently Bonded ◽  
Conventional Structure

We have devised a novel technique which uses a simple theoretical model to simulate the reduction of immunoglobulin M (IgM) molecules. By fitting the results of the simulated depolymerization to experimental data, we have obtained statistical evidence which suggests that two major isomeric forms of covalently-bonded IgM monomer are liberated when human 19S IgM is reduced with dithiothreitol. The two heavy chains of isomer 1 are linked by two dilsulfide bridges, one in the segment designated the "hinge" region (position 337), the other penultimate to the COOH terminus of the chains (position 575). The half-cystines at position 414, which are free in isomer 1, form an inter-heavy chain bridge in isomer 2. Theoretically, the relative proportions of the two forms of monomer liberated in the reduction depend upon the dithiothreitol concentration, with isomer 2 predominating at higher dithiothreitol concentrations. Although in this paper we have assumed the conventional structure of the IgM molecule, the liberation of isomers depends only upon a symmetrical arrangement of the three types of inter-heavy chain bonds in the cyclic 19S pentamer.

Viscous Flow-Induced Bending of Microcantilever Sensors

2006 ◽  
Author(s):  
Anirban Jana ◽  
Steve Tripp ◽  
Arvind Raman ◽  
Ronald Reifenberger
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
High Resolution ◽  
Viscous Flow ◽  
Biological Species ◽  
Sensor Technology ◽  
Microcantilever Sensors ◽  
Simple Theoretical Model ◽  
Aqueous Environments ◽  
High Bandwidth

Micro-cantilevers have recently evolved into a key sensor technology. Many of these sensors are deployed in fluid streams, for example, in rapid sensing of trace quantities of chemical or biological species in gaseous or aqueous environments[1,2], or in high resolution, high bandwidth anemometry [3]. Their design needs to consider microcantilever bending caused by the flow. This work presents detailed experimental data on the flowinduced bending of micro-cantilevers, and a simple theoretical model for quantitatively predicting such behavior.

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