scholarly journals Neutron Diffraction Determination of Mean-square Atomic Displacements in InAs and GaSb

1981 ◽  
Vol 34 (6) ◽  
pp. 689 ◽  
Author(s):  
JE Tibballs ◽  
SM Feteris ◽  
Z Barnea
Keyword(s):  
Bragg Reflection ◽  
Perturbation Approach ◽  
Mean Square ◽  
Thermal Diffuse Scattering ◽  
Atomic Displacements ◽  
Diffraction Determination ◽  
Potential Perturbation ◽  
The Mean ◽  
The One ◽  
Integrated Intensities

Integrated intensities for Bragg reflection of neutrons from single crystals of the III-V compounds InAs and GaSb have been measured at room temperature. The data were collected at two wavelengths, 0'947 and 1�241 A, in order' to establish the adequacy of a correction for moderate to severe anisotropic extinction. Data were also obtained for InAs at four temperatures from 408 to 933 K. Corrections for thermal diffuse scattering were applied. The results were analysed in the one-particle potential perturbation approximation with terms to fourth order in the atomic displacements u == (ut, U2, U3)' At 296 K, the mean-square components <u;) determined were: In, 0'0116(2) A2; As, 0'0102(1) A2; and Ga, 0,0120(3) A2; Sb, 0,0107(3) A2. The third-order coefficients for InAs are comparable with those for Si and Ge, while those for GaSb are comparable with those for zinc cha1cogenides. Below 400 K, the mean-square displacements in InAs decrease faster than predicted by the present perturbation approach.

Dynamic and Static Displacements of Atoms in B2-Phase of TiNi Alloy

2008 ◽  
Vol 59 ◽  
pp. 108-112
Author(s):  
Vyacheslav M. Gundyrev ◽  
Vitaly I. Zel'dovich
Keyword(s):  
Single Crystal ◽  
Crystal Lattice ◽  
Titanium Nickelide ◽  
Tini Alloy ◽  
Mean Square ◽  
Atomic Displacements ◽  
Structure Factors ◽  
The Mean ◽  
B2 Phase ◽  
Integrated Intensities

We measured integrated intensities of 26 reflections of the B2-phase of titanium nickelide single crystal and determined structure factors for these reflections. Based on the structure factors, mean squares of displacements of Ni and Ti atoms with respect to the crystal-lattice sites have been determined. After that we determined the mean squares of atomic displacements <u2>Ni and <u2>Ti in temperature range of existence of the B2-pase, at temperatures Т1=328 K and T2=376 K. We separated the mean squares of atomic displacements <u2>Ni and <u2>Ti into static and dynamic ones. The mean squares of dynamic displacements of Ni and Ti atoms are identical, but the mean square of static displacements is greater by a factor of 4.7 for Ni atoms than for Ti atoms. The Debye temperature calculated from the mean squares of displacements of Ni atoms is 360 K; that calculated for Ti atoms in a similar way is 390 K. The large value of complete atomic displacements in TiNi is due to static rather than dynamic displacements of atoms, mainly due to static displacements of nickel atoms.

scholarly journals Bicluster CC Algoritm Analysis to Identify Patterns of Food Insecurity in Indonesia

2020 ◽  
Vol 17 (2) ◽  
pp. 325-338
Author(s):  
Raditya Novidianto ◽  
Rini Irfani
Keyword(s):  
Food Insecurity ◽  
Agricultural Sector ◽  
Parameter Tuning ◽  
Mean Square ◽  
Calorie Consumption ◽  
Food And Agriculture ◽  
Food And Agriculture Organization ◽  
The Mean ◽  
Best Parameter ◽  
The One

Indonesia is known as an agricultural country. This means that most of the population work in the agricultural sector related to food. However, food insecurity still occurs in Indonesia. With the COVID-19 pandemic, the Food and Agriculture Organization (FAO) stated that there was a threat of food scarcity which had an impact on food insecurity conditions. This would undermine the second goal of the SDGs, which is to end hunger and create sustainable agriculture. The purpose of this study was to determine the spatial pattern of food insecurity in each province in Indonesia using the bicluster method. The data used are data from Susenas and Sakernas by BPS in 2019. Several studies show that the bicluster method with the CC algorithm shows that each province group has a different characteristic pattern. In the bicluster approach, the researcher runs parameter tuning to select the best parameter based on the Mean Square Residual in Volume (MSR / V). The CC algorithm tries to get a bicluster with a low MSR value, therefore the best parameter is the one that produces the smallest MSR / V value, in this study the smallest MSR / V is 0,01737 with δ = 0,01. The application of the CC biclustering algorithm to the food insecurity structure in Indonesia results in 5 bicluster. Bicluster 1 consists of 15 provinces with 8 variables, Bicluster 2 consists of 10 provinces with 5 variables, Bicluster 3 consists of 3 provinces with 7 variables, Bicluster 4 consists of 4 provinces with 4 variables and Bicluster 5 consists of 2 provinces with 5 variables. Biculster 4 represents a cluster of food insecurity areas with the characteristics of the bicluster P0, P1, P2 and calorie consumption of less than 1400 KKAL.

High-Order Distributed Consensus with One-Bit Adaptive Quantization

2012 ◽  
Vol 591-593 ◽  
pp. 1299-1302
Author(s):  
Wen Kai Wang ◽  
Huan Xin Peng
Keyword(s):  
Convergence Rate ◽  
High Order ◽  
Consensus Algorithm ◽  
Quantization Scheme ◽  
Mean Square ◽  
Distributed Consensus ◽  
Adaptive Quantization ◽  
Convergence Performance ◽  
The Mean ◽  
The One

The convergence performance of distributed consensus algorithm with adaptive quantization communication depends on the convergence rate of the distributed consensus algorithm. In order to improve the convergence performance of distributed consensus under adaptive quantization communication, based on the one-bit adaptive quantization scheme, we propose the high-order distributed consensus to update the state of every node. We analyze the convergence performance and calculate the mean square error of the high-order distributed consensus algorithm with one-bit adaptive quantization. The high-order distributed consensus with one-bit adaptive quantization achieves a consensus in a mean square sense. Simultaneously, Simulations are done about the high-order distributed consensus based on one-bit adaptive quantization. Results show that the high-order distributed consensus algorithm based on one-bit adaptive quantization can reach an average consensus, and its convergence rate is higher than those of the first-order adaptive quantized distributed consensus algorithm and second-order adaptive quantized distributed consensus algorithm.

Geometrical analysis of self-compensating suspension systems for railcar engineering

2002 ◽  
Vol 216 (3) ◽  
pp. 185-196 ◽  
Author(s):  
F Sorge
Keyword(s):  
The Other ◽  
Mean Square ◽  
Geometrical Analysis ◽  
Suspension Systems ◽  
Longitudinal Plane ◽  
Articulated Systems ◽  
Gradient Type ◽  
The Mean ◽  
The One ◽  
Acceleration Component

The present analysis addresses several passive tilt systems for railroad cars aiming to compensate for the cart deficiency on curved tracks. To this end, the virtual centre of suspension must be located as close as possible to the longitudinal plane of symmetry of the coach, above the mass centre level for stability reasons. On the one hand, pantograph or Peaucellier's mechanisms may achieve the correct self-compensation. On the other hand, simpler articulated systems yield the desired goal with an excellent approximation. For example, selective algorithms can be applied for designing eight-link mechanisms, to be optimized thereafter by some method of the gradient type, minimizing the mean square value of the transverse acceleration component.

An energy-dispersive X-ray diffraction study of mean-square atom displacements in highly oriented pyrolytic graphite

1986 ◽  
Vol 19 (3) ◽  
pp. 200-201 ◽  
Author(s):  
T. H. Metzger
Keyword(s):  
Pyrolytic Graphite ◽  
Energy Dispersive ◽  
Mean Square ◽  
Highly Oriented Pyrolytic Graphite ◽  
X Ray Diffraction ◽  
Thermal Diffuse Scattering ◽  
X Ray ◽  
Integrated Intensity ◽  
The Mean ◽  
Thermal Diffuse

The measurement of the mean-square thermal displacement 〈u 2〉 of carbon atoms in highly oriented pyrolytic graphite (HOPG) in the hexagonal c direction is reported. Energy-dispersive X-ray diffraction (EDXD) has been used to study the integrated intensity of all Bragg reflections 004 through 0′0′14 as a function of temperature. It is demonstrated that the correction of the Bragg intensities due to thermal diffuse scattering contributions is very important for HOPG, when EDXD is used. The Debye temperature ΘD = 554 (30) K is obtained.

scholarly journals Mean Square Vibration Amplitudes in Zinc

1977 ◽  
Vol 30 (1) ◽  
pp. 105 ◽  
Author(s):  
DW Field
Keyword(s):  
Single Crystal ◽  
Debye Temperature ◽  
Mean Square ◽  
X Ray Diffraction ◽  
Zinc Single Crystal ◽  
X Ray ◽  
Structure Factors ◽  
Principal Directions ◽  
The Mean ◽  
Integrated Intensities

The structure factors of 98 independent reflections have been determined by measurement of the integrated intensities for X-ray diffraction from a zinc single crystal at 295 K. The mean square vibration amplitudes found for the two principal directions are' compared with 'other recent measurements. The X-ray Debye temperature determined from the data' is 207 � 3 K at 295 K.

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