Pico satélite educativo CanSat desarrollado en las plataformas ARM-CortexM4 y FPGA

This paper presents the design and implementation of a CanSat pico-satellite developed on the ARM-CortexM4 and FPGA Spartan6 platforms. The CanSat structure consists of four modules distributed in four levels of construction. The first level is the sensor module, consisting of: the IC BME280 (barometer, humidity and temperature), the L70 GPS system and an inertial sensors system MPU6050 and AK8975. The second level is the mission control module and incorporates an ARM-STM32F407 microcontroller integrated with the OS-Micropython that allows programming in Python language. This module has the capacity of data storage using an EEPROM-M24C32 memory and a micro-SD. The third level is the LoRa technology wireless communications module with a 10Km range. The fourth level is the vision module, consisting of an OV7670 camera interconnected with the FPGA XC6SLX16, which functions as a photo and video capture system. The design of the modules was made with SMD technology in PCB of up to four layers. The design of the CanSat protective case in PLA material, manufactured by 3D printing of FDM technology, is presented. Finally, the results of preliminary performance tests are presented.

Utilizing Optical Character Recognition and Boarder Detection Algorithms to Identify Trading Cards

Magic: The Gathering is a popular physical trading card game played by millions of people around the world. To keep track of their cards, players typically store them in some sort of physical protective case, which can become cumbersome to sort through as the number of cards can reach up to the thousands. By utilizing and improving optical character recognition software, the TCG Digitizer allows users to efficiently store their entire inventory of Magic: The Gathering trading cards in a digital database. With an emphasis on quick and accurate scanning, the final product provides an intuitive digital solution for storing Magic: The Gathering cards for both collectors and card owners who want to easily store their collection of cards on a computer.

Development of Testing Platform for Building Shading Device

In this paper a shading coefficient test platform using artificial light sources was developed to measure the shading coefficient of some typical shading products for building. The platform consists of three testing cases and a protective case. The results show that the detection period using this method was approximately 5-6 hours, and stability of repeating test was good. The experiment results of between-glass venetian blinds are compared with the simulation results to verify the scientific feasibility of the test method.

Comparison of the Delay in Processing Time and Protective Plastic Cases in Two Phosphor Plate Systems

Objective. The purpose of this study was to analyze two phosphor plate systems (PSPs) (Dürr Dental, Digora Optime) according to their scanning delay and protective plastic case performances.Methods. Two PSPs using an aluminum step wedge were exposed. These plates were placed in three different protective plastic cases (manufacturers' original cases, black case, and white case) before obtaining the radiographs and were then processed immediately and 1, 5, 10, 30, 60, 120, 240, and 480 min after exposure. Mean gray values (MGVs) of the 3rd, 5th, 7th, and 9th steps of the wedges were compared using ANOVA.Results. Statistically significant differences were found between the two PSPs (). ANOVA revealed that the MGVs of four steps of the wedges were significantly different from each other for all scan delays (). MGVs increased with increasing scanning delay, except the group with Dürr plates in their original cases. Reduction in image quality began 5 min after exposure in the other Dürr plate groups.Conclusions. Within the limitations of the current study, it can be concluded that scanning delay causes a reduction in image quality, and using the manufacturer's original protective case will result in better performance of PSPs.

Contrasting behavioural responses of grazing mayflies and detritivorous caddisflies to predatory fish

Invertebrates living in streams where predatory fish are present are often able to detect them through water-borne chemical cues and respond with behavioural changes that lower predation risk. We hypothesised that behavioural responses to a predatory fish (brown trout, Salmo trutta) would be stronger in grazing mayflies (Baetis sp. and Epeorus sp.) than in detritivorous caddisflies (Potamophylax latipennis and Chaetopteryx sp.) in a montane stream in central Spain, because of differences in their foraging ecology and the presence of a protective case in the latter. Grazing mayflies reduced their rates of movement and entrance into the drift when trout were present, but this response disappeared shortly after trout removal by electrofishing. Mayflies also showed marked drift diel periodicity when trout were present. In contrast, detritivorous caddisflies responded to the potential predation threat by withdrawing into their case. However, their response was the same regardless of the presence of trout, which also had no influence on their movement patterns or drift activity. Our results suggest that effects of predatory fish on stream invertebrates vary with invertebrate traits such as foraging ecology and predator-avoidance strategies.