Detailed clay mineralogy of the TriassicJurassic boundary section at Kendlbachgraben (Northern Calcareous Alps, Austria)

The Triassic-Jurassic boundary (TJB) is marked by one of the five largest Phanerozoic mass extinctions. To constrain existing models for TJB events, we obtained a stratigraphically highly resolved dataset from a marine section at Kendlbachgraben, Austria. The topmost Triassic Ko¨ssen Formation contains low to medium-charged smectite and vermiculite as alteration products of mafic-ultramafic minerals. The clay minerals in the boundary mudstone are kaolinite 5 illite + muscovite >> smectite > chlorite. Predominant kaolinite suggests humid climate and abundant terrigenous input. In the lowermost Jurassic, the clay mineral pattern changes to illite + muscovite >> kaolinite >> smectite, which reflects change to less humid and more moderate climate. The topmost Ko¨ssen Formation also contains clay spherules. Their composition, shape and size indicate that they are alteration products of airborne volcanic glass droplets solidified in the air, settled in the sea and altered rapidly with negligible transport in terrestrial or marine environments. Our data are consistent with sudden climatic change at the TJB, as a result of large-scale volcanic activity of the Central Atlantic Magmatic Province which produced distal airfall volcanic ash

Parallel robot controlled by PLC and its digital twin

Modern ways of device development use the concept of a digital twin. A digital twin is an accurate digital copy of something that exists or is planned to be realized in the physical world. The digital twin is not only a virtual model of the physical system, but also a dynamic data and status information carrier obtained through a series of IoT-connected sensors that collect data from the physical world and send it to machines. The digital twin provides an overview of what is happening to the device in real time. This is very important in industry as this information is helpful to reduce maintenance issues and ensure production performance. This work focuses on the design and creation of a cybernetic physical system and its digital twin, based on CAD system modeling in conjunction with simulation and programming tools connected to real and simulated control systems. This process accelerates the development of the application implementation with the possibility to create a PLC control program and tune the system already in the design phase. Thus, the physical realization can be done in parallel with the programming and creation of the HMI interface. Modular programming will further accelerate software development [1]. The created system and its digital twin serve as a unified teaching tool without the need for real devices to be used by many students and users. This approach allows testing of program algorithms without the risk of damaging physical devices and is also suitable for distance learning

Early Tithonian Serpulid-Dominated Cavity-Dwelling Fauna, and the Recruitment Pattern of the Serpulid Larvae.

International audienc

Automatizovaný merací systém a jeho aplikácia v skúšobníctve VN

V tomto článku sú popísané základné vlastnosti sériového prenosu dát a ich využitie v číslicovom meracom systéme a v skúšobníctve

Electric Drive with Linear Permanent Magnet Synchronous Motor Current State of Research

Current state of research in the area of linear synchronous motor control is presented. Two control methods, vector control and forced dynamics control, are described for speed control of the drive. Both methods offer a dynamic speed response profile, which can be selected for given application by the user. In addition to this, the angle between stator current and moving part magnetic flux vectors is maintained mutually perpendicular to maximize force of the machine. To achieve prescribed speed response during forced dynamics control derived control law requires the external force information, which is obtained from observer. The observer outputs are position, speed, acceleration and external force, which can be exploited for both control techniques and also for diagnostic purpose. Simulations and preliminary experimental results confirm the intended performance of the drive

Preliminary experimental results for indirect vectorcontrol of induction motor drives with forced dynamics

The contribution presents an extension of indirect vector control of electric drives employing induction motors to 'Forced Dynamic Control'. This method of control offers an accurate realisation of dynamic response profiles, which can be selected by the user. The developed system can be integrated into a drive with a shaft position encoder or a shaft sensoriess drive, in which only the stator currents are measured. The applied stator voltages are determined by a computed inverter switching algorithm. Simulation results and preliminary experimental results for indirect vector control of an idle running induction motor indicate good agreement with the theoretical predictions