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The software support for simulation of electrical circuits has been developed for more than sixty years. Currently, the standard tools for simulation of analogous circuits are the simulators based on the open source package Simulation Program with Integrated Circuit Emphasis generally known as SPICE (Biolek 2003). There are many different applications that provide graphical interface and extended functionalities on the basis of SPICE or, at least, using SPICE models of electronic devices. The author of this paper performed a simulation of a circuit that acts as an electronic diode in Multisim and provides a comparison of the simulation results with the results obtained from measurements on the real circuit. © ECMS Thorsten Claus, Frank Herrmann, Michael Manitz, Oliver Rose (Editors).

This article presents the possibilities offered by exploiting CHR 6-DM Orientation Sensors in Security Technologies. It also addresses hardware resources suitable for the inertial navigation of RC models used in Security Technologies. The basis of the CHR 6-DM sensor is a gyroscope that is further complemented by an accelerometer and a magnetometer. In order to use orientation sensor security technology, suitable software was developed that can be used for the autonomous implementation of autonomous RC models suitable for use in Security Technology applications. © ECMS Thorsten Claus, Frank Herrmann, Michael Manitz, Oliver Rose (Editors).

The software support for simulation of electrical circuits has been developed for more than sixty years. Currently, the standard tools for simulation of analogous circuits are the simulators based on the open source package Simulation Program with Integrated Circuit Emphasis generally known as SPICE (Biolek 2003). There are many different applications that provide graphical interface and extended functionalities on the basis of SPICE or, at least, using SPICE models of electronic devices. The author of this paper performed a simulation of a circuit that acts as an electronic diode in Multisim and provides a comparison of the simulation results with the results obtained from measurements on the real circuit. © ECMS Thorsten Claus, Frank Herrmann, Michael Manitz, Oliver Rose (Editors).

This article presents the possibilities offered by exploiting CHR 6-DM Orientation Sensors in Security Technologies. It also addresses hardware resources suitable for the inertial navigation of RC models used in Security Technologies. The basis of the CHR 6-DM sensor is a gyroscope that is further complemented by an accelerometer and a magnetometer. In order to use orientation sensor security technology, suitable software was developed that can be used for the autonomous implementation of autonomous RC models suitable for use in Security Technology applications. © ECMS Thorsten Claus, Frank Herrmann, Michael Manitz, Oliver Rose (Editors).

For the purposes of development of a small and autonomously operated airship, a need to create a model of its propelling and motion has arisen. Being described within this paper, the model defines the requirements that are imposed to motors, propellers and the airship's controlling system. The model is based on a typical design of a small airship, that consists of two main propellers, being placed symetrically according to the gondola beneath the airship's bladder, and one tail propeller that is placed transversely at the airship's tail. According to this model, forces needed to move the airship in the desired direction can be estimated as well as the power consumption of the motors and angular velocity of the propellers. Although the dynamic model of the airship would exceed the framework of this paper, it is also described in broad terms and the results of two main simulations are presented hereby. The simulations describe the behavior of the airship in case of forward acceleration and braking as well as in case of yawing with such braking that ensures reaching of the desired yawing angle. © ECMS Valeri M. Mladenov, Petia Georgieva, Grisha Spasov, Galidiya Petrova (Editors).

The paper presents the design and experimental experience with the gas flow measurement instrument for the range of (5-25) ml/hr. The aimed application area is in a biochemical laboratory for the study of reaction kinetic of sediments decomposition in waste water. The time-of-flight type of sensor with one upstream and one downstream temperature sensor has been chosen for the study. We explain the basic operation principles of the tiny flow measurement and the sensor structure. In the numerical model paragraph, we are describing the basic configuration model and the modelling results. As the three-dimensional simulation would be very time consuming process, we have simplified the simulation for only two-dimensional task. The presented diagrams are derived for different gases (air, nitrogen, carbon oxide and chlorine) and sensor tube materials, namely steel, copper, and plexi-glass. We present also the experimental set-up including the design and sensor parameters. The paragraph with experimental results and discussion on them illustrates the good correspondence with expected values. The paper concludes with the employment of designed gas flowmeter in the biochemical laboratory. © ECMS Valeri M. Mladenov, Petia Georgieva, Grisha Spasov, Galidiya Petrova (Editors).

For the purposes of development of a small and autonomously operated airship, a need to create a model of its propelling and motion has arisen. Being described within this paper, the model defines the requirements that are imposed to motors, propellers and the airship's controlling system. The model is based on a typical design of a small airship, that consists of two main propellers, being placed symetrically according to the gondola beneath the airship's bladder, and one tail propeller that is placed transversely at the airship's tail. According to this model, forces needed to move the airship in the desired direction can be estimated as well as the power consumption of the motors and angular velocity of the propellers. Although the dynamic model of the airship would exceed the framework of this paper, it is also described in broad terms and the results of two main simulations are presented hereby. The simulations describe the behavior of the airship in case of forward acceleration and braking as well as in case of yawing with such braking that ensures reaching of the desired yawing angle. © ECMS Valeri M. Mladenov, Petia Georgieva, Grisha Spasov, Galidiya Petrova (Editors).

The paper presents the design and experimental experience with the gas flow measurement instrument for the range of (5-25) ml/hr. The aimed application area is in a biochemical laboratory for the study of reaction kinetic of sediments decomposition in waste water. The time-of-flight type of sensor with one upstream and one downstream temperature sensor has been chosen for the study. We explain the basic operation principles of the tiny flow measurement and the sensor structure. In the numerical model paragraph, we are describing the basic configuration model and the modelling results. As the three-dimensional simulation would be very time consuming process, we have simplified the simulation for only two-dimensional task. The presented diagrams are derived for different gases (air, nitrogen, carbon oxide and chlorine) and sensor tube materials, namely steel, copper, and plexi-glass. We present also the experimental set-up including the design and sensor parameters. The paragraph with experimental results and discussion on them illustrates the good correspondence with expected values. The paper concludes with the employment of designed gas flowmeter in the biochemical laboratory. © ECMS Valeri M. Mladenov, Petia Georgieva, Grisha Spasov, Galidiya Petrova (Editors).