Ramsey pricing of aircraft landing fees: A case study of Iranian airports

2020 ◽  
pp. 100922
Author(s):  
Maryam Saremi ◽  
Firouz Fallahi ◽  
Eric Pels ◽  
Behzad Salmani ◽  
Mohsen Pourebadollahan Covich
Keyword(s):  
Aircraft Landing ◽  
Ramsey Pricing

scholarly journals Effects of Spring and Damper Elements in Aircraft Landing Gear Dynamics

2020 ◽  
Vol 8 (5) ◽  
pp. 4265-4269
Keyword(s):  
Shock Absorber ◽  
Impact Force ◽  
Landing Gear ◽  
Damping Coefficient ◽  
Aircraft Landing ◽  
Aircraft Landing Gear ◽  
Spring Coefficient ◽  
Mass Spring ◽  
The Impact

In this study a typical Aircraft Landing Gear with shock absorber was modeled a Mass-Spring-Damper System. Basic components of the system were explained. The equations of the model was presented. Aircraft Landing Gear was also modeled in Matlab/Simulink for a given set of aircraft parameters. A case study for an Aircraft Landing Gear was solved and results were presented. Results included the variation of spring (k1 and k2 ) and damping coefficient (b) in a given interval to show their effects on the impact force and displacement of landing gear as main outputs to consider. Effect of damping coefficient (b) on impact force was found to be highest (3.76%), spring coefficient (k1 ) effect is moderate (2.29%), and spring coefficient (k2 ) is lower (0.97%), for a change of ±10% of coefficients.

Ramsey Pricing for Cost Recovery Applied to Reservoir Infrastructure in Andalucía (Spain)

2017 ◽  
Vol 03 (04) ◽  
pp. 1650029 ◽  
Author(s):  
Teresa Sanchez-Martinez ◽  
Noelina Rodriguez-Ferrero
Keyword(s):  
Public Administration ◽  
River Basin ◽  
Cost Recovery ◽  
Water Infrastructure ◽  
Ramsey Pricing ◽  
Guadalquivir River

This paper proposes the Ramsey pricing methodology as a useful tool for water managers. As a case study, first we propose an alternative calculation of the annual depreciation charge for the investment in water infrastructure to that currently made by public administration, and then we apply the Ramsey contribution to the calculation of the price or regulatory tariff charged in 2009 by the Guadalquivir River Basin Authority (Andalucía, Spain) for providing water for urban supply and irrigation. According to Ramsey’s formula, its greatest effect is felt by domestic users, whose demand is relatively inelastic, compared to those whose demand is for agricultural purposes.

The Genesis and Internal Dynamics of El Salvador's People's Revolutionary Army, 1970–1976

2014 ◽  
Vol 38 (01) ◽  
pp. 102-129
Author(s):  
ALBERTO MARTÍN ÁLVAREZ ◽  
EUDALD CORTINA ORERO
Keyword(s):  
Latin America ◽  
El Salvador ◽  
Early Years ◽  
Left Wing ◽  
Internal Dynamics ◽  
Internal Coherence ◽  
The 1960S

AbstractUsing interviews with former militants and previously unpublished documents, this article traces the genesis and internal dynamics of the Ejército Revolucionario del Pueblo (People's Revolutionary Army, ERP) in El Salvador during the early years of its existence (1970–6). This period was marked by the inability of the ERP to maintain internal coherence or any consensus on revolutionary strategy, which led to a series of splits and internal fights over control of the organisation. The evidence marshalled in this case study sheds new light on the origins of the armed Salvadorean Left and thus contributes to a wider understanding of the processes of formation and internal dynamics of armed left-wing groups that emerged from the 1960s onwards in Latin America.

Culture and the plasticity of perception

2020 ◽  
Vol 43 ◽  
Author(s):  
Michael Lifshitz ◽  
T. M. Luhrmann
Keyword(s):  
Cultural Context ◽  
Sensory Experience ◽  
Cultural Learning ◽  
The World

Abstract Culture shapes our basic sensory experience of the world. This is particularly striking in the study of religion and psychosis, where we and others have shown that cultural context determines both the structure and content of hallucination-like events. The cultural shaping of hallucinations may provide a rich case-study for linking cultural learning with emerging prediction-based models of perception.

Dual systems for all: Higher-order, role-based relational reasoning as a uniquely derived feature of human cognition

2019 ◽  
Vol 42 ◽  
Author(s):  
Daniel J. Povinelli ◽  
Gabrielle C. Glorioso ◽  
Shannon L. Kuznar ◽  
Mateja Pavlic
Keyword(s):  
Temporal Reasoning ◽  
Higher Order ◽  
Important Case ◽  
Human Cognition ◽  
Relational Reasoning ◽  
Dual Systems ◽  
First Order ◽  
Reasoning System ◽  
Role Based

Abstract Hoerl and McCormack demonstrate that although animals possess a sophisticated temporal updating system, there is no evidence that they also possess a temporal reasoning system. This important case study is directly related to the broader claim that although animals are manifestly capable of first-order (perceptually-based) relational reasoning, they lack the capacity for higher-order, role-based relational reasoning. We argue this distinction applies to all domains of cognition.

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