Finito o Infinito : una cuestión de gusto

The concept of infinite was always associated to the possible conclusion or creation of the world. The first philosophers knew that the possibility of existence of the infinite quantities cannot be discarded. But their attitude in front of this reality in the real world, the space and time, is very different.La idea de infinito ha estado siempre ligada a los problemas planteados por una posible conclusión del Mundo en el que el hombre habitaba. Los primeros filósofos sabían que no podían pasar por alto la posibilidad de la existencia de las cantidades infinitas. La actitud de estos pensadores respecto a la realidad del infinito en el mundo real, espacio y tiempo, ha sido históricamente muy diversa

Mister Morton, Stop Your Courtin\u27 / music by Frederick V. Bowers; words by Charles Horwitz

Cover: drawing of a woman peering from behind a tree; photo inset of The Nichols Sisters; Publisher: Sol Bloom (Chicago)https://egrove.olemiss.edu/sharris_b/1025/thumbnail.jp

Audits and inspections are never enough: a critique to enhance food safety

Internal and external food safety audits are conducted to assess the safety and quality of food including on-farm production, manufacturing practices, sanitation, and hygiene. Some auditors are direct stakeholders that are employed by food establishments to conduct internal audits, while other auditors may represent the interests of a second party purchaser or a third-party auditing agency. Some buyers conduct their own audits or additional testing, while some buyers trust the results of third-party audits or inspections. Third-party auditors, however, use various food safety audit standards and most do not have a vested interest in the products being sold. Audits are conducted under a proprietary standard, while food safety inspections are generally conducted within a legal framework. There have been many foodborne illness outbreaks linked to food processors that have passed third-party audits and inspections, raising questions about the utility of both. Supporters argue third-party audits are a way to ensure food safety in an era of dwindling economic resources. Critics contend that while external audits and inspections can be a valuable tool to help ensure safe food, such activities represent only a snapshot in time. This paper identifies limitations of food safety inspections and audits and provides recommendations for strengthening the system, based on developing a strong food safety culture, including risk-based verification steps, throughout the food safety system

When Being Soft Makes You Tough: A Collision Resilient Quadcopter Inspired by Arthropod Exoskeletons

Flying robots are usually rather delicate, and require protective enclosures when facing the risk of collision. High complexity and reduced payload are recurrent problems with collision-tolerant flying robots. Inspired by arthropods' exoskeletons, we design a simple, easily manufactured, semi-rigid structure with flexible joints that can withstand high-velocity impacts. With an exoskeleton, the protective shell becomes part of the main robot structure, thereby minimizing its loss in payload capacity. Our design is simple to build and customize using cheap components and consumer-grade 3D printers. Our results show we can build a sub-250g, autonomous quadcopter with visual navigation that can survive multiple collisions at speeds up to 7m/s that is also suitable for automated battery swapping, and with enough computing power to run deep neural network models. This structure makes for an ideal platform for high-risk activities (such as flying in a cluttered environment or reinforcement learning training) without damage to the hardware or the environment

Development of a Web Application for Continuous Analysis of Many Cameras (CAM2)

There are tens of thousands of web cameras located around the world and publicly available on the Internet. The images captured by these cameras contain data relating to our living environment such as traffic patterns, weather and crowd movement. Researchers can capture this data using image analysis techniques on the video and image from these cameras. However, there is a lack of a single, unified repository of all the public cameras on the Internet; this, coupled with the computational demands of image analysis means there is a need for a tool to help researchers perform large-scale image analyis on many cameras. Continuous Analysis of Many Cameras (CAM2) is a framework that enables researchers to execute image analysis programs on many web camera image data on a large scale. Users can choose from a database of more than 70,000 cameras worldwide, and its custom application programming interface (API) enables users to upload their own image analysis programs for the system to execute. This paper will detail the structure and use of the CAM2 system through its website, and discuss updates to the system introduced in the July 2015 Alpha 1.4 release. These changes have improved stability and usability of the system, making CAM2 a more effective tool for researchers

Azar y probabilidad

Tesis Univ. Complutense, 1984.Fac. de FilosofíaTRUEProQuestpu

Azar y probabilidad

Tesis Univ. Complutense, 1984.Fac. de FilosofíaTRUEProQuestpu

Radiation from relativistic jets in turbulent magnetic fields

Using our new 3-D relativistic electromagnetic particle (REMP) code parallelized with MPI, we have investigated long-term particle acceleration associated with an relativistic electron-positron jet propagating in an unmagnetized ambient electron-positron plasma. The simulations have been performed using a much longer simulation system than our previous simulations in order to investigate the full nonlinear stage of the Weibel instability and its particle acceleration mechanism. Cold jet electrons are thermalized and ambient electrons are accelerated in the resulting shocks. The acceleration of ambient electrons leads to a maximum ambient electron density three times larger than the original value. Behind the bow shock in the jet shock strong electromagnetic fields are generated. These fields may lead to the afterglow emission. We have calculated the time evolution of the spectrum from two electrons propagating in a uniform parallel magnetic field to verify the technique.Comment: 3 pages, 2 figures, submitted for the Proceedings of The Sixth Huntsville Gamma-Ray Burst Symposium 2008, Huntsville, AL, October 20-23, 200