scholarly journals Mathematical Modelling of Output Responses and Performance Variations of an Education System due to Changes in Input Parameters

2021 ◽  
Vol 6 (1) ◽  
pp. 327-335
Author(s):  
Najat Messaoudi ◽  
Jaafar Khalid Naciri ◽  
Bahloul Bensassi
Keyword(s):  
Mathematical Modelling ◽  
Education System ◽  
Input Parameters ◽  
And Performance ◽  
Performance Variations

scholarly journals Electrophysiological and performance variations following driving events involving an increase in mental workload

2019 ◽  
Vol 11 (1) ◽  
Author(s):  
Hugo Loeches De La Fuente ◽  
Catherine Berthelon ◽  
Alexandra Fort ◽  
Virginie Etienne ◽  
Marleen De Weser ◽  
...  
Keyword(s):  
Mental Workload ◽  
And Performance ◽  
Performance Variations

Performance Variations Among Strategic Group Members: An Examination of Individual Firm Capability

1989 ◽  
Vol 15 (4) ◽  
pp. 649-661 ◽  
Author(s):  
Michael W. Lawless ◽  
Donald D. Bergh ◽  
William D. Wilsted
Keyword(s):  
Explanatory Power ◽  
Group Analysis ◽  
Performance Model ◽  
Strategic Groups ◽  
Strategic Group ◽  
Common Strategy ◽  
Firm Capability ◽  
Group Members ◽  
And Performance ◽  
Performance Variations

Because of inconsistent empirical evidence, the membership-performance model pervasive in strategic group analysis is re-examined. We propose that individualfirm capabilities, which reflect capacity to implement or change strategy, moderate the effect of members' shared strategy characteristics on performance. Controlling for market structure, we defined two strategic groups based on common strategy characteristics among 55 manufacturing firms. We found significant differences in performance and capabilities within each group. There was also evidence of a significant correlation between capabilities and performance within each group. We conclude that effects offirms' capabilities should be accountedfor to increase the explanatory power of strategic groups in competitive performance.

Optimisation Techniques Applied to the Design of Gas Turbine Blades Cooling Systems

2006 ◽  
Author(s):  
Gianlorenzo Bucchieri ◽  
Massimo Galbiati ◽  
Daniele Coutandin ◽  
Stefano Zecchi
Keyword(s):  
Best Practice ◽  
Optimization Algorithms ◽  
Turbine Blades ◽  
Geometrical Parameters ◽  
Cfd Model ◽  
Cfd Validation ◽  
Mean Values ◽  
Input Parameters ◽  
And Performance ◽  
Practice Methods

This paper addresses the methodology used to design the layout of the tip cooling nozzles of a high pressure rotor blade turbine. The methodology used is through a complete CAE approach, by means of a parametric CFD model which is run several times for the exploration of several designs by an optimizer. Hence the design is carried out automatically by parallel computations, with the optimization algorithms taking the decisions rather than the design engineer. The engineer instead takes decision regarding the physical settings of the CFD model to employ, the number and the extension of the geometrical parameters of the blade tip holes and the optimization algorithms to be employed. From CFD validation the final design of the tip cooling geometry found by the optimizer has proved to be better than the base design, which used mean values of all input parameters, and than the design proposed by an experienced heat transfer AVIO engineer, who used standard best practice methods. Furthermore the large number of experiences gained by the simulations run by the optimizer allowed the designer to find laws, functions and correlation between input parameters and performance output, with a further and deeper insight on this specific design problem.

Spain and the Lost Legal Generation: Spain's Dysfunctional University System is Also to Blame

2014 ◽  
Vol 15 (6) ◽  
pp. 1209-1221 ◽  
Author(s):  
Katia Fach Gómez
Keyword(s):  
Higher Education ◽  
Education System ◽  
A Priori ◽  
Law Students ◽  
State University ◽  
University System ◽  
Higher Education System ◽  
And Performance ◽  
Spanish Higher Education ◽  
Academic Year

For the last fifteen years I have taught final year law students at a Spanish state university on a regular basis. While it is extremely difficult to generalize about matters such as the following, I believe that the typical profile of the different groups of students I have taught over the years has been relatively homogenous in terms of quality and performance. Along with a minority of highly motivated and able students, at the beginning of every academic year the classes are mostly made up of silent students who area priorireluctant to accept individual responsibilities in the learning process. Having presented this seemingly harsh appraisal with no preamble, one of the aims of this essay is to set out a series of arguments that enable us to go beyond the glib self-righteousness of blaming the students for all their woes. In my opinion, it is the Spanish higher education system that is the mainly to blame for many of the factors currently holding law students back. The following factors contribute to this outcome.

scholarly journals Modelling and Analysis of Surface Evolution on Turning of Hard-to-Cut CLARM 30NiCrMoV14 Steel Alloy

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1751
Author(s):  
Syed Muhammad Raza ◽  
Aqib Mashood Khan ◽  
Muhammad Umar Farooq ◽  
Asif Iqbal ◽  
Danil Yurievich Pimenov ◽  
...  
Keyword(s):  
Mathematical Modelling ◽  
Surface Finish ◽  
Feed Rate ◽  
Rotational Speed ◽  
Prediction Models ◽  
Pressure Vessels ◽  
Depth Of Cut ◽  
Central Component ◽  
Steel Alloy ◽  
Input Parameters

Industrial practitioners are working on predictive solutions for the precise evaluation of input parameters and processed surfaces of engineering materials. To aid the aeronautical industry, this study is an effort to develop the mathematical modelling for comprehensive surface analysis of input parameters and surface finish after dry machining of CLARM HBR, a steel alloy with attractive mechanical properties and wide applications in large caliber gun barrels and high-pressure vessels. Feed rate, rotational speed, and depth of cut were taken as quantitative parameters, whereas machining time was considered as a categorical factor with a classification of three levels. Response surface methodology (RSM) with a central component design has been used for the constitution of the experimental design, mathematical modelling, and analysis of developed models. Eighteen samples were prepared to perform the experimentation for the development of prediction models. The adequacy of the developed models was verified using analysis of variance (ANOVA), and the models were validated using confirmatory trial experiments, which revealed the experimental results agreeing with predictions. The feed rate was the most significant parameter in achieving the desired surface finish. An increase in rotational speed at a low feed rate resulted in very fine surface texture, as though it deteriorated the surface finish at higher feed rates. The superior surface quality obtained was 0.137 μm at parametric settings of 0.19 mm/rev feed, 90 rpm speed, 3 mm depth of cut, and 4 min time. Overall, higher values of surface roughness were frecorded in the third level of process variable time. The developed empirical models are expected to aid manufacturers and machining practitioners in the prediction of the desired surface finish concerning different parameters before the experimentations.

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