Search results for "205"
showing 10 items of 516 documents
The Chinese Postman Problem with Load-Dependent Costs
2018
[EN] We introduce an interesting variant of the well-known Chinese postman problem (CPP). While in the CPP the cost of traversing an edge is a constant (equal to its length), in the variant we present here the cost of traversing an edge depends on its length and on the weight of the vehicle at the moment it is traversed. This problem is inspired by the perspective of minimizing pollution in transportation, since the amount of pollution emitted by a vehicle not only depends on the travel distance but also on its load, among other factors. We define the problem, study its computational complexity, provide two mathematical programming formulations, and propose two metaheuristics for its soluti…
Multivariate modeling and analysis of regional ocean freight rates
2018
Abstract In this paper, we propose a new multivariate model for the dynamics of regional ocean freight rates. We show that a cointegrated system of regional spot freight rates can be decomposed into a common non-stationary market factor and stationary regional deviations. The resulting integrated CAR process is new to the literature. By interpreting the common market factor as the global arithmetic average of the regional rates, both the market factor and the regional deviations are observable which simplifies the calibration of the model. Moreover, forward contracts on the market factor can be traded in the Forward Freight Agreement (FFA) market. We calibrate the model to historical spot r…
Orientation-invariance of individual differences in three face processing tasks
2019
Numerous studies have reported impairments in perception and recognition, and, particularly, in part-integration of faces following picture-plane inversion. Whether these findings support the notion that inversion changes face processing qualitatively remains a topic of debate. To examine whether associations and dissociations of the human face processing ability depend on stimulus orientation, we measured face recognition with the Cambridge Face Memory Test (CFMT), along with experimental tests of face perception and selective attention to faces and non-face objects in a sample of 314 participants. Results showed strong inversion effects for all face-related tasks, and modest ones for non-…
Information nutritionnelle, choix et caractéristiques des consommateurs
2012
Consumers’ food decisions are based on the information they receive and on their own individual characteristics. This paper is based on an experiment using experimental economics and sensory evaluation to measure individual characteristics of participants and to analyze the impact of nutritional information relative to orange juice. The aim is to explore the potential link between specific characteristics (risk aversion, time preference) and the reactions of consumers to nutritional information. The results show that participants react significantly to this information supplied, positively for the pure orange juice and a negatively for orange nectars. In addition, “risk averse” individuals …
The many faces of human sociality: uncovering the distribution and stability of social preferences
2018
There is vast heterogeneity in the human willingness to weigh others' interests in decision making. This heterogeneity concerns the motivational intricacies as well as the strength of other-regarding behaviors, and raises the question how one can parsimoniously model and characterize heterogeneity across several dimensions of social preferences while still being able to predict behavior over time and across situations. We tackle this task with an experiment and a structural model of preferences that allows us to simultaneously estimate outcome-based and reciprocity-based social preferences. We find that non-selfish preferences are the rule rather than the exception. Neither at the level of …
El Espectro de Rayos X
2017
Este vídeo tiene como objetivo el estudio del espectro de rayos X, es decir, el análisis de la intensidad de rayos X, producidos mediante el frenado de electrones por un material, para cada longitud de onda. Se comienza con el desarrollo histórico que condujo al descubrimiento de los rayos X y al conocimiento de su naturaleza electromagnética.A continuación se explica detalladamente el montaje experimental que permite la medida del espectro de rayos X y se analizan los procesos físicos que dan lugar al mismo.Se finaliza comentando algunas aplicaciones actuales de los rayos X. Producció: Servei de Formació Permanent i Innovació Educativa (http://www.uv.es/sfpie)
Photoelectric Effect (Video) Project: Quantum Physics Virtual Laboratory
2020
Author: González Marhuenda, Pedro; Date: 2020 Abstract: This video is about the photoelectric effect, that is, the emission of electrons by a metal when it is lighted up. For this emission to occur the frequency of the light has to reach or exceed a characteristic threshold frequency for each metal. The effect is first visualized with a home-built electroscope, which allows us to observe the discharge of a zinc plate when lighted up with an ultraviolet lamp. Then, a more elaborate experimental setup allows for a more detailed analysis of the dependence of the electron emission on the intensity and frequency of the incident light.Production: Servei de Formació Permanent i Innovació Educativa…
Efecto Fotoeléctrico
2015
Este vídeo tiene como objetivo el análisis del efecto fotoeléctrico, es decir de la emisión de electrones por un metal cuando sobre él incide luz (radiación electromagnética) de frecuencia superior a la denominada frecuencia umbral de ese metal. El efecto se presenta primero mediante un electroscopio casero, que permite observar la descarga de una placa de zinc, previamente cargada, con una lámpara de luz ultravioleta. Después, mediante un montaje experimental más elaborado, se analiza la corriente fotoeléctrica y se estudia su dependencia con la intensidad y la frecuencia de la luz incidente. Realizado para el Proyecto de Innovación Educativa «Laboratori Virtual de Física Quàntica». Produc…
Las grietas de la imagen. Una mirada a la trastienda de los primeros documentales etnográfico sobre el pueblo ainu (1897-1936)
2014
This work is a historical study of the representation of the Ainu people through ethnographic documentaries made in Japan before the Pacific War. The corpus has been divided into three sections: first, the Ainu in the first Lumière actualités filmed in Japan. Second, in the actualités of Pathé productions and the reference to the lost documentary of Torii Ryozo. Third,in the travelogues, made in Japan by Frederick Starr and Benjamin Brodsky in the 1910s. \ud When comparing the film analysis to the social reality of the Ainu, in section four, it becomes clear how documentaries tried to project a deceiving ethnicity belonging to a time prior to the moment they were filmed. Thus, filmmakers ai…
The Fight for the Self-Representation. Ainu Imaginary, Ethnicity and Assimilation
2017
Film representation of the Ainu people is as long as cinema but it has not remained stable over time. From the origins of cinema, Ainu people were an object of interest for Japanese and foreign explorers who portrayed them as an “other” savage and isolated from the modern world. The notion of “otherness” was slightly modified during wartime, as the Ainu were represented as other Japanese subjects within the “imperial family” and at the end of the fifties, during which entertainment cinema presented the Ainu according to the western Hollywood code on the one hand; and Mikio Naruse proposed a new portrayal Ainu focusing on the Ainu as a long discriminated social collective rather than as an e…