Recently, glasses containing rare earth ions have evoked interest due to their potential applications in solid-state laser, display devices, sensors, reflecting windows, waveguides, 3D data storage devices etc. In particular the Sm3+ ions in host glass material exhibit broad emission bands due to 4G5/2 →5HJ (J = 5/2, 7/2, 9/2, 11/2) transitions in any host matrix. In order to obtain optimum emission characteristics for device applications, the characteristic features of host as well as concentration dependent studies of Sm3+ are essential. In this regard, a new series of Samarium doped Zinc Lithium Borate glass were synthesized and their optical properties were investigated.
As it was pointed out at the Davos Forum, in the era of talentism, the company's prosperity will depend on human capital. However, human resources management is associated with the need to counter threats to the entire product lifecycle caused by the human factor. Managing labor risks is associated with the need for an individual assessment of the human resource, which is a very laborious task, requiring digitalization of this projects area. The article presents the developed concept of an assessment system and architecture of the labor risks module for project tasks. A mathematical model for calculating labor risks has been formulated, taking into account many factors of the Project Server corporate environment, external sources of corporate data, such as the electronic passes system and MS Outlook e-mail. Algorithms of the program module's operation to calculate resource and design indicators have been developed, and the general architecture of the system has been built. Logical and physical data models are designed, all information system's objects for calculating resource and design indicators are identified. The software implementation methods, the software platform and the environment for implementing the assigned tasks are described in the paper. The software interface of the VSTO add-in was developed, its functional purpose and software forms to operate and analyze the calculated data on resources and project tasks are described.
Students are taught in undergraduate lectures about dynamic systems, control theory and computer programming. However, in the engineering practice a more diverse skillset is required. In addition to the topics covered in lectures, Model Driven Engineering (MDE) should be introduced to the curriculum. With the help of MDE students can learn to develop controls for dynamic systems, furthermore they learn about signal processing and communication systems, using an efficient and effective method. As a case study, the controlled object that is used in this educational project is an Electronic Throttle Valve (ETV). The ETV is used as a laboratory project, because it can be controlled by a diverse range of controller designs, from simple to complex. During the design phase of a new controller, its functionality and reliability should be tested in all development phases. An appropriate process for testing and applying MIL, SIL, PIL and HIL simulation is the V-cycle. This paper describes the related education methods at Deggendorf Institute of Technology (DIT). As an introduction a short description of related educational activities at DIT in current study plans will be given. Thereafter, the modelling method applied to the ETV will be presented together with the control design by Input-Output-linearization. Comparison of the MIL, SIL, PIL and HIL simulation techniques for identifying potential errors are performed for each test-case. The test result of the hardware implementation on an FPGA board will be discussed in the last section.
Extending the lifetime of the wireless sensor node is a critical issue facing the developing of the wireless sensor networks. One of the solutions is employing the energy harvesting technologies to collect renewable energy from the ambient environment. For indoor Wireless Sensor Network (WSN) applications, the chosen of the energy harvester is based on the requirements of the application and the environment. Our application will be used in offices and hospitals so using a noiseless technology is required. So, the photovoltaic energy is the best solution which matches the requirements. In this paper, we will present the design of the photovoltaic energy harvesting system with mathematical modeling and the results of the real experiments.
The paper is focused on the tram input LC traction filter stabilization by the super capacitor energy storage system. The input LC filter is almost undamped resonant circuit connected on the both sides to the sources of disturbances. On the input side, LC filter is connected by the tram pantograph to the dc-trolley overhead lines. The main disturbances are caused by the dc-trolley voltage drops, other vehicles, pantographs head arcs, etc. On the output side, the LC filter is connected to the traction drive. With the constant torque command, the tram during the voltage drops increase the current flow from the LC filter to hold constant torque and thereby further decrease the LC filter voltage, and vice versa. This could lead to unstable traction drive behavior. The super capacitor storage system, which is commonly used to accumulate energy during tram breaking, can be furthermore used to stabilize LC filter voltage. The paper describes the algorithm of the LC filter stabilization by the super capacitor storage system control.
