We consider classical and quantum dynamics of a tachyonic system described by a DBI type Lagrangian and inverse cosh potential. This investigation is partially motivated by the string theory and D-brane dynamics, but mostly by their application in cosmological inflation. A formalism for describing dynamics of spatially homogenous tachyon scalar field with this kind of potentials is developed. Classical actions and corresponding quantum propagators in the Feynman path integral approach, both on real and nonarchimedean spaces, are calculated. Possibilities for a quantum adelic generalization of these models are noticed. Cosmological applications are pointed out and discussed.

We consider dynamics of a free relativists particle at very short distances treating space-time as Archimedean as well as no Archimedean one. Usual action for the relativistic particle is nonlinear. Meanwhile, in the real case, that system may be treated like a system with quadratic (Hamiltonian) constraint. We perform similar procedure in p-adic case, as the simplest example of a no Archimedean space. The existence of the simplest vacuum state is considered and corresponding Green function is calculated. Similarities and differences between obtained results on both spaces are examined and possible physical implications are discussed.

The paper discusses a mobile robot localization. Due to cost and simplicity of signal processing, the ultrasonic sensors are very suitable for this application. However, their nonlinear characteristics requires thorough calibrating procedure in order to achieve reliable readings from the obstacles around the robot. Here we describe SMR400 ultrasonic sensor and its calibration procedure. The suggested calibration procedure was tested through a number of experiments, and the results are presented in this paper.

A growing research in biomimetic legged robot design challenges today's theory path planning and motion control. For many reasons a biomimetic robot requires a heading sensor onboard for better path following and steering. We propose a use of a digital compass as low-cost sensor. However, cheap versions of that sensor are extremely sensitive to inclination that occurs due to locomotion, resulting in incorrect measurements. This paper presents a modeling procedure of a digital compass performance with respect to altered roll and pitch angles. With information from an additional accelerometer as tilt sensor that reads roll and pitch angles of the robot the model improves the compass readings making it insensitive to altered tilt. The fusion of the modeling and a compass-accelerometer setup is experimentally verified

Electrical energy generation in solar modules is mainly limited by the increase in their temperature, and a heat removal process plays an important role. The main goal of the experiment was to keep the temperature of the cooled module below 47 °C through a series of the five short cooling and heating cycles and to determine the changes in the solar module output power during the cooling process with 96% ethyl alcohol. The optimal duration of the cooling cycles was determined to be between 3–6 min and for the heating process, it was 4–5 min. During the heating and cooling cycles the temperature of the cooled module did not exceed 42.1 °C. At the end of five active cooling cycles the temperature difference of 22.6 °C was achieved. The biggest difference in power between the cooled and uncooled module was 4.9%. The solar module efficiency was increased by 3.2%. It was concluded that alcohol, due to its evaporative losses, is not a viable cooling agent for solar modules. Nevertheless, it can serve as a potent additive in both active and passive cooling systems to augment the output power of solar modules.