Estudio de los procesos de volatilización, transporte y excitación en la determinación espectrográfica de impurezas en bifluoruro amónico

Tesis inédita de la Universidad de Madrid, Facultad de Ciencias, Sección de Químicas , leída el 30 de septiembre de 1974.Universidad de MadridTRUEProQuestpu

Estudio de los procesos de volatilización, transporte y excitación en la determinación espectrográfica de impurezas en bifluoruro amónico

Tesis inédita de la Universidad de Madrid, Facultad de Ciencias, Sección de Químicas , leída el 30 de septiembre de 1974.Universidad de MadridTRUEProQuestpu

Recommender system for sport videos based on user audiovisual consumption

This paper describes a recommender system for sport videos, transmitted over the Internet and/or broadcast, in the context of large-scale events, which has been tested for the Olympic Games. The recommender is based on audiovisual consumption and does not depend on the number of users, running only on the client side. This avoids the concurrence, computation and privacy problems of central server approaches in scenarios with a large number of users, such as the Olympic Games. The system has been designed to take advantage of the information available in the videos, which is used along with the implicit information of the user and the modeling of his/her audiovisual content consumption. The system is thus transparent to the user, who does not need to take any specific action. Another important characteristic is that the system can produce recommendations for both live and recorded events. Testing has showed advantages compared to previous systems, as will be shown in the results

Secure Geographic Routing in Ad Hoc and Wireless Sensor Networks

Security in sensor networks is one of the most relevant research topics in resource constrained wireless devices and networks. Several attacks can be suffered in ad hoc and wireless sensor networks (WSN), which are highly susceptible to attacks, due to the limited resources of the nodes. In this paper, we propose innovative and lightweight localization techniques that allow for intrusion identification and isolation schemes and provide accurate location information. This information is used by our routing protocol which additionally incorporates a distributed trust model to prevent several routing attacks to the network. We finally evaluate our algorithms for accurate localization and for secure routing which have been implemented and tested in real ad hoc and wireless sensor networks

Architectures for Future Media Internet

Among the major reasons for the success of the Internet have been the simple networking architecture and the IP interoperation layer. However, the traffic model has recently changed. More and more applications (e.g. peerto-peer, content delivery networks) target on the content that they deliver rather than on the addresses of the servers who (originally) published/hosted that content. This trend has motivated a number of content-oriented networking studies. In this paper we summarize some the most important approache

The relationship among aggression, hyperactivity prosocial behavior, and social status in minority school -aged children from low -income neighborhoods.

This dissertation investigated the longitudinal relationship among hyperactivity, aggression, prosocial behavior, social rejection, and victimization in a sample of ethnically diverse (35% African-American, 52% Hispanic, 11% Non-Hispanic White) elementary school children residing in low-income neighborhoods in a large midwestern city. The sample was equally distributed between boys and girls. Data was collected for 407 children from grades 1--3, 262 children from grades 4--6, and 82 children from grades 1--3--6. Aggression and hyperactivity generally increased up to 0 grade and decreased by 6th grade. These two behaviors were highly correlated in all grades for both genders (R2 = .80--.93). As a result, a composite measure of both behaviors was compared with the social status variables. The results revealed that aggression/hyperactivity was positively correlated with rejection and victimization in all grades. However, aggression/hyperactivity was negatively associated with popularity in the 3rd grade for boys and 3rd, 4th, and 6th grades for girls. Prosocial behavior seemed to buffer aggressive/hyperactive older boys (4th--6th) from being victimized two years later Aggression/hypcractivity was negatively associated with popularity once prosocial behavior was controlled for in 3rd, 4 th, and 6th grades for boys. Highly aggressive/hyperactive boys who were very prosocial were just as popular as low aggressive boys in the 4th grade and were the most popular boys in the 6 th grade. Prosocial behavior buffered aggressive/hyperactive girls from being unpopular in the 3rd, 4th, and 6 th grades. The relationship between aggression/hyperactivity and social status was also examined over time. Earlier aggression/hyperactivity predicted increased victimization over time for younger boys while earlier victimization predicted decreased aggression/hyperactivity for older girls. Hence, older girls learned to reduce victimization by decreasing their aggression/hyperactivity over tune. The relationship between aggression/hyperactivity and prosociality was also examined over time. Rejection and victimization in 1st grade predicted decreased prosocial behavior in third grade and vice versa. Prosocial behavior predicted decreased rejection two years Law for older boys. Earlier victimization predicted decreased prosocial behavior in younger girls while earlier prosocial behavior predicted decreased victimization in older girls. The context, culture, and peer perceptions of aggressive behavior are discussed.Ph.D.Clinical psychologyEducationEducational psychologyEducational sociologyEthnic studiesPsychologySocial SciencesUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/132697/2/9977272.pd

Determinacion de selenio en minerales y rocas por espectrometria de absorcion atomica

Centro de Informacion y Documentacion Cientifica (CINDOC). C/Joaquin Costa, 22. 28002 Madrid. SPAIN / CINDOC - Centro de Informaciòn y Documentaciòn CientìficaSIGLEESSpai

Determinacion de elementos metalicos en suspension en aire mediante espectrometria de absorcion atomica

Centro de Informacion y Documentacion Cientifica (CINDOC). C/Joaquin Costa, 22. 28002 Madrid. SPAIN / CINDOC - Centro de Informaciòn y Documentaciòn CientìficaSIGLEESSpai