http://hdl.handle.net/20.500.14044/35010 Sun, 26 Jul 2026 00:42:28 GMT 2026-07-26T00:42:28Z http://hdl.handle.net/20.500.14044/35210 The Use of Composite Materials in the Production of Tower Cranes Tulekov, Auyezkhan; Togizbayeva, Baglan; Kenesbek, Inkara; Kenesbek, Anuar; Zabiyeva, Aliya This scientific article examines the use of innovative materials, such as composite materials, on lifting vehicles, in particular on a high-rise tower crane. Facilitation of structural components is a new field of research developed specifically for the production of special vehicles. The research work will begin primarily with identifying the dimensions of a tower crane using the example of the Chinese model QTZ 80A, which is used at many construction areas, then conducting the experimental part using software and the finite element method (FEM). The parameters of the research will be as follows: maximum deformation, maximum stress and bending of the boom of the tower crane. The materials that will be used in the research are as follows: classical steel and the following composite materials: carbon fiber and fiberglass. For the expediency of the research, the characteristics of composite materials in stress should be similar to classical materials. The experimental part of the research consists of comparing the parameters of the tower crane specified above, using different materials. The results of this study showed that a crane made of innovative composite materials and especially carbon fiber, has the lowest weight, i.e. about 20% of the weight of a classic steel crane, but has the same load capacity characteristics. The reliability of tower crane components made of composite materials is similar to the reliability of components made of steel. Sun, 01 Jan 2023 00:00:00 GMT http://hdl.handle.net/20.500.14044/35210 2023-01-01T00:00:00Z http://hdl.handle.net/20.500.14044/35209 Extending the Input and Transformation Space of Different TP Models: An LMI-based Feasibility Analysis Wéber, Andrea; Kuczmann, Miklós; Baranyi, Péter This paper discusses that the selection and modification of the input and the transformation space, of the Tensor Product (TP) model representation, of a given quasi– Linear Parameter Varying (qLPV) state‐space model, has an influence on the feasibility regions of the Linear Matrix Inequality (LMI) based control design techniques. Moreover, three factors affect the feasibility regions of the LMI-based control design: The manipulation of the position of vertices The number of the inputs of the TS fuzzy model representation Modifying the transformation space The proof is based on a complex control design example, where the impact of the above factors can be clearly demonstrated. Furthermore, the paper presents that the maximal and minimal parameter space of the controller depends on factors (i) and (ii). The aim of the feasibility test is to show that there exists a solution for LMIs or not, considering these factors. The example is based on the academic Translational Oscillator with Rotational Actuator (TORA) system. Then, the TP model transformation-based framework is used to vary the input space of the TP model representation. In addition, the paper gives a very decisive conclusion that the design technique may be sensitive for the input space of the TS fuzzy model, hence it is necessary to consider the number of inputs, the transformation space and the gains defined on the inputs when a TP model is generated to achieve the best solution to the control purposes. All in all, this paper investigates the effect of input space modification of the TP model representation of a given qLPV state-space model on the feasibility regions of LMI-based controller design methods Sun, 01 Jan 2023 00:00:00 GMT http://hdl.handle.net/20.500.14044/35209 2023-01-01T00:00:00Z http://hdl.handle.net/20.500.14044/35208 Thermal Property Investigation of a Simplified, Dye-Sensitized Solar Cell: Analyzing the Heat Transfer in Solids and Fluids, with a Turbulent Flow, for Open-Circuit Voltage Calculations Rácz, Ervin Utilizing renewable energy sources is a long-term mitigation solution. Electricity generation by photovoltaic (PV) is growing rapidly and PV is at the forefront of the renewable energy revolution. Dye-Sensitized Solar Cell (DSSC) is one of the more popular transparent solar cells used for architectures. Additionally, DSSC is a cost-effective solar cell and simple to manufacture because of the inexpensive materials, which are used in the fabrication processes. This article explores a method to optimize the thermal properties of the DSSC. For the simulation COMSOL Multiphysics software usage has been used and 3- dimensional scheme via numerically solved coupled models – such as heat transfer in solids and fluids, and turbulent flow – in stationary mode have been applied. Boundary conditions have been added and described in great details. For the optimization process, the glass substrate has been modified. The temperature distribution in the volume and in the surface; pressure distribution in the volume; and velocity distribution in the volume have been presented. On the other hand, the temperature distribution, along a line, is extracted from the 3-dimensional geometry, to analyze the thermal behavior and use for further investigation, the electrical behavior of the Dye-Sensitized Solar Cell. The results show that the higher temperature, which is located at the top part of the geometry, is 318 K. The calculated open-circuit voltage of the cell is between 448 mV and 452 mV and the gradient is −2 𝑚𝑚𝑚𝑚/°𝐶𝐶 Sun, 01 Jan 2023 00:00:00 GMT http://hdl.handle.net/20.500.14044/35208 2023-01-01T00:00:00Z http://hdl.handle.net/20.500.14044/35207 The Implications of Electric Scooters as a New Technology Artifact in Urban Transportation Szemere, Dorottya; Nemeslaki, András E-scooters are becoming an increasingly important component of urban transportation networks, providing a sustainable alternative for first and last-mile travel. However, if they are not managed and regulated carefully, they can become a risk to users and cities in general. In this paper, we studied the emergence of this innovative, platform- based, and shareable e-scooter, as a possible ‘greener’ transport alternative, from a sustainability and environmental awareness perspective. The most critical question is legislation. Urban planners need to implement laws limiting maximum speeds, requiring the use of e-scooter infrastructure, and providing dedicated parking, as well as limiting the number of licensed operators. In our exploratory research, we conducted three focus group discussions to explore the views of non-users and then built the nomological network from the key phenomenons they identified. The participants are confused about micro-mobility solutions, according to the findings, due to a lack of clarity on regulatory problems and poor infrastructure. As a result, we propose that policies should be co-developed in cooperation with various stakeholders to enable antagonistic conversation about alternative policy actions by evaluating their effectiveness in terms of behavioral change as well as their implementability. Sun, 01 Jan 2023 00:00:00 GMT http://hdl.handle.net/20.500.14044/35207 2023-01-01T00:00:00Z