Valley mixing in GaAs/AlAs multilayer structures in the effective-mass method

1993 ◽  
Vol 47 (20) ◽  
pp. 13498-13507 ◽  
Author(s):  
Y. Fu ◽  
M. Willander ◽  
E. L. Ivchenko ◽  
A. A. Kiselev
Keyword(s):  
Effective Mass ◽  
Multilayer Structures ◽  
Effective Mass Method

The effective mass method for surface states

1983 ◽  
Vol 16 (5) ◽  
pp. 985-997 ◽  
Author(s):  
A Fasolino ◽  
G Santoro ◽  
E Tosatti
Keyword(s):  
Effective Mass ◽  
Surface States ◽  
Effective Mass Method

scholarly journals Sloughing in potatoes induced by tuber density and affected by variety

2008 ◽  
Vol 26 (No. 1) ◽  
pp. 48-57 ◽  
Author(s):  
A. Hejlová ◽  
J. Blahovec
Keyword(s):  
Effective Mass ◽  
Linear Models ◽  
Close Association ◽  
Cooking Time ◽  
Time Sensitivity ◽  
Starting Point ◽  
Effective Mass Method

Two cultivars (Nicola and Saturna) largely distinguishing from each other in cooking behaviour and one cultivar (Agria) grown in six different cultivation regimes were tested by the CPEM (cooked potato effective mass) method for the potato sloughing assessment. The sloughing process is characterised by two cooking and disintegration stages, from which two basic CPEM parameters are derived: cooking time as the starting point of disintegration and the rate of the disintegration. Both parameters are analysed as functions of the tuber density in linear models of both stages. Significant differences in CPEM parameters and in the linear models were observed between different varieties. The data from two-year measurements were in basic agreement with our previous concept of the limited contribution of starch in the first cooking stage and of its more important role in the second disintegration stage of sloughing. The results indicated a close association between the mechanisms controlling sloughing and the tuber density in the cultivars Agria and Saturna. A different cooking behaviour was observed in the case of the typical salad cultivar Nicola with a considerably lower cooking time sensitivity to the tuber density.

scholarly journals The modified CPEM (cooked potato effective mass) method: an instrumental assessment of potato sloughing

2010 ◽  
Vol 28 (No. 5) ◽  
pp. 407-411
Author(s):  
A. Hejlová ◽  
J. Blahovec
Keyword(s):  
Effective Mass ◽  
Disintegration Rate ◽  
Instrumental Assessment ◽  
Cooking Properties ◽  
Potato Flakes ◽  
The Individual ◽  
Time Required ◽  
Two Parameters ◽  
Further Development ◽  
Effective Mass Method

The cooked potato effective mass (CPEM) method for potato sloughing assessment involves cooking the potato flakes on the sieve in a stirred water bath and periodically determining their effective mass during cooking. The final cooking curve divided into the cooking and breaking parts provides two parameters: the cooking time (CT) is the time required for starting disintegration, while the slope of the breaking part (SBP) describes the disintegration rate. The method enables a detailed analysis of the cooking properties in relation to the tuber density. The modified analysis of the cooking curve is based on polynomial approximation of the breaking part. It provides the time of cooking (CT<sub>max</sub>) required to reach the maximal disintegration rate (MDR). These new parameters represent an alternative to the existing ones, their values are easier to obtain from the individual cooking curves, and therefore they can serve as a base for further development of the CPEM tests. &nbsp;

Mass and stiffness identification of particle beam system based on a dynamic effective mass method

2020 ◽  
pp. 107754632095059
Author(s):  
Guangyang Hong ◽  
Jian Li ◽  
Jingwu Pan ◽  
Jianhong Fang ◽  
Hongying Li
Keyword(s):  
Solid State ◽  
Effective Mass ◽  
Excitation Frequency ◽  
Particle Beam ◽  
Burial Depth ◽  
Flow State ◽  
Beam System ◽  
Stiffness And Damping ◽  
Effective Mass Method ◽  
Variation Tendency

We perform an investigation on identification of the complicated particle beam system, focusing on the occurrence and the mechanism of the resonant peaks. The concept concerning dynamic effective mass of the particle beam system is put forward, which realizes the decoupling of mass, stiffness, and damping. Excitation strategies, such as constant amplitude variable frequency sweep, are used during the testing process. The relationships between the dynamic effective mass of the particle beam system and the excitation frequency are recorded to study the mass and stiffness effects of the system. The results show that the variation of system stiffness and the negative mass are the main reasons for occurrence of resonant peaks. On the basis of the variation tendency of stiffness, we infer that the particle flow state transits from solid state to liquid state and thus, the whole frequency band is divided into three regions with an increase in excitation frequency. Within the region of solid state, resonant frequencies can be estimated roughly, which also proves reliability of the inference. The influence of burial depth and force amplitude on stiffness and mass of the system is investigated to reveal the tendency of all peaks and explain the jump phenomenon roughly.

Investigation of ultra-thin films of YBa2Cu3O7−δ grown on MgO

1990 ◽  
Vol 48 (4) ◽  
pp. 6-7
Author(s):  
S.K. Streiffer ◽  
C.B. Eom ◽  
J.C. Bravman ◽  
T.H. Geballet
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Deposition Process ◽  
Nucleation And Growth ◽  
Multilayer Structures ◽  
Rf Power ◽  
Oxygen Loss ◽  
Transmission Electron ◽  
Single Target ◽  
Mtorr Argon

The study of very thin (<15 nm) YBa2Cu3O7−δ (YBCO) films is necessary both for investigating the nucleation and growth of films of this material and for achieving a better understanding of multilayer structures incorporating such thin YBCO regions. We have used transmission electron microscopy to examine ultra-thin films grown on MgO substrates by single-target, off-axis magnetron sputtering; details of the deposition process have been reported elsewhere. Briefly, polished MgO substrates were attached to a block placed at 90° to the sputtering target and heated to 650 °C. The sputtering was performed in 10 mtorr oxygen and 40 mtorr argon with an rf power of 125 watts. After deposition, the chamber was vented to 500 torr oxygen and allowed to cool to room temperature. Because of YBCO’s susceptibility to environmental degradation and oxygen loss, the technique of Xi, et al. was followed and a protective overlayer of amorphous YBCO was deposited on the just-grown films.

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