PROGRAMMED MICRO- AND NANOSCAL MODULES

  • TITLE: PROGRAMMED MICRO- AND NANOSCAL MODULES
  • AUTHOR(S): O. Melnyk, V. Kozarevych
  • ABSTRACT: The article is devoted to the analysis of topical antagonistic issues regarding the implementation of new computer programming methods that can be used to reproduce heterogeneous binary functions of several arguments based on micro- and nanoelectronic multiplexer modules. The growth of specialization of modern large integrated circuits comes into conflict with their universality, which increases the cost of design work and reduces the production volumes of typonominal devices. The trade-off between specialization and versatility should be minimized by computer-aided design of micro- and nano-sized modules with programmable logic. Programming is not performed to create algorithms for processing discrete information, as implemented by a microprocessor, but by logical settings of multiplexer micro- and nanodevices. The results of the combined simulations obtained in the work confirm the equivalence of their functioning, as well as the advantages of cell-based Coulomb nanomultiplexers in reliability, technological scalability, energy efficiency, speed, and disadvantages in exclusively cryogenic ultra-low temperature applications. Obviously, the evolution of microelectronics will continue only in the context of the widespread introduction of nanoscale modules with new functional principles of operation.
  • DOI: http://doi.org/10.62853/GALJ9367
  • PAGES: 53-58
  • DOWNLOAD: Vol72-2026.pdf
  • HOW TO CITE THIS ARTICLE: O. Melnyk, V. Kozarevych, PROGRAMMED MICRO- AND NANOSCAL MODULES. Journal of the Technical University of Gabrovo. 72 (2026) 53-58. http://doi.org/10.62853/GALJ9367.

CONSTRUCTING A ROBOT BASE FRAME CAPABLE OF BALANCING ITS CENTER OF GRAVITY

  • TITLE: CONSTRUCTING A ROBOT BASE FRAME CAPABLE OF BALANCING ITS CENTER OF GRAVITY
  • AUTHOR(S): D. A. Viet
  • ABSTRACT: This study presents the design and experimental validation of a compact robot base frame capable of actively balancing its center of gravity through linear mass redistribution. The system employs a lead-screw-driven sliding counterweight actuated by a NEMA 17 stepper motor and regulated by a real-time proportional controller with hysteresis-based state logic. An analytical moment-balance model establishes the relationship between counterweight mass and maximum compensable load, demonstrating that the balancing capacity is approximately 69% of the counterweight mass under the given geometric constraints. Controller tuning shows that a pure proportional gain Kp=40 achieves a settling time of approximately 16 s with zero overshoot. Experimental multi-load disturbance tests confirm stable bidirectional compensation, accurate load detection within 100 ms, and effective suppression of hunting behavior through a ±100 g deadzone and a 20 g hysteresis band. The results demonstrate that a mechanically simple, single-degree-of-freedom translational mechanism can provide reliable and repeatable mass-based stabilization for compact robotic platforms.
  • DOI: http://doi.org/10.62853/PCNE4711
  • PAGES: 48-52
  • DOWNLOAD: Vol72-2026.pdf
  • HOW TO CITE THIS ARTICLE: D. A. Viet, CONSTRUCTING A ROBOT BASE FRAME CAPABLE OF BALANCING ITS CENTER OF GRAVITY. Journal of the Technical University of Gabrovo. 72 (2026) 48-52. http://doi.org/10.62853/PCNE4711.

USE OF IMAGE ANALYSIS IN THICKNESS PREDICTION OF THERMOFORMED PACKAGING

  • TITLE: USE OF IMAGE ANALYSIS IN THICKNESS PREDICTION OF THERMOFORMED PACKAGING
  • AUTHOR(S): O. Eksi, K. Feratoglu, S. Karabeyoglu
  • ABSTRACT: In this study, Image Analysis was used as a verification tool in thickness prediction of thermoformed packages. First, the thickness distribution of thermoformed packages in three different colours was obtained experimentally. Then, thickness variation was estimated using the light transmittance of thermoformed packages. Particularly, the light-transmitting side walls of the packaging were taken into consideration, and the thickness of the side walls was predicted. ImageJ, a Java-based, open-source Image Processing software, was used to generate thickness predictions. Predicted and obtained thickness values were compared to each other. Thickness values predicted by ImageJ, showed good agreement with the experimental results.
  • DOI: http://doi.org/10.62853/GRWE4549

  • PAGES: 43-47

  • DOWNLOAD: Vol72-2026.pdf
  • HOW TO CITE THIS ARTICLE: O. Eksi, K. Feratoglu, S. Karabeyoglu, USE OF IMAGE ANALYSIS IN THICKNESS PREDICTION OF THERMOFORMED PACKAGING. Journal of the Technical University of Gabrovo. 72 (2026) 43-47. http://doi.org/10.62853/GRWE4549

ANALYSIS OF THE EXPERIENCE FOR CLIMATE MODERNIZATION OF ENGINEERING SYSTEMS IN BUILDINGS

  • TITLE: ANALYSIS OF THE EXPERIENCE FOR CLIMATE MODERNIZATION OF ENGINEERING SYSTEMS IN BUILDINGS
  • AUTHOR(S): V. Aftaniuk, D. Sengl, E. Parada
  • ABSTRACT: In this paper, an analysis of solutions for adapting existing buildings to changing operating conditions, climate and technological requirements is fulfilled. Dynamic modernization allows the sustainable operation of buildings, taking into account modern standards for engineering systems. The projects under consideration use flexible engineering solutions that allow according to response changes in load, and prospects for ensuring the stability of automation while taking into account user comfort. The main objective in the considered examples of building modernization is to study the experience of work on the modernization of engineering systems of buildings, on the basis of which approximate economic and environmental assessments were obtained that correspond to similar projects.
  • DOI:  http://doi.org/10.62853/DGRC9495
  • PAGES: 39-42
  • DOWNLOAD: Vol72-2026.pdf
  • HOW TO CITE THIS ARTICLE: V. Aftaniuk, D. Sengl, E. Parada, ANALYSIS OF THE EXPERIENCE FOR CLIMATE MODERNIZATION OF ENGINEERING SYSTEMS IN BUILDINGS. Journal of the Technical University of Gabrovo. 72 (2026) 39-42. http://doi.org/10.62853/DGRC9495

HEAT TRANSFER ANALYSIS OF FULLY DEVELOPED TURBULENT NON-NEWTONIAN NANO AND HYBRID NANOFLUID FLOW IN A HORIZONTAL PIPE UNDER CONSTANT HEAT FLUX

  • TITLE: HEAT TRANSFER ANALYSIS OF FULLY DEVELOPED TURBULENT NON-NEWTONIAN NANO AND HYBRID NANOFLUID FLOW IN A HORIZONTAL PIPE UNDER CONSTANT HEAT FLUX
  • AUTHOR(S): D. Ozgur
  • ABSTRACT: This study investigates the thermal and flow characteristics of fully developed turbulent non-Newtonian (power-law type) nano and hybrid nanofluids flowing through a horizontal pipe under constant heat flux. Carboxymethylcellulose (CMC) solution is used as the base fluid, while Al₂O₃, CuO and hybrid (Al₂O₃+CuO) nanoparticles are employed as additives. The governing equations are non-dimensionalized and solved under steady-state and axisymmetric assumptions. Nusselt number, friction factor, and thermal performance ratio (TPR) are analyzed. Results show that hybrid nanofluids provide approximately %15–20 higher heat transfer enhancement compared to mono nanofluids, while the increase in friction factor remains moderate. The optimum particle volume fraction is found to be around φ≈%2.5. This study demonstrates that hybrid nanofluids in non-Newtonian matrices are efficient alternatives for improving convective heat transfer in turbulent flow systems.
  • DOI: http://doi.org/10.62853/MUBG8779
  • PAGES: 34-38
  • DOWNLOAD: Vol72-2026.pdf
  • HOW TO CITE THIS ARTICLE: D. Ozgur, HEAT TRANSFER ANALYSIS OF FULLY DEVELOPED TURBULENT NON-NEWTONIAN NANO AND HYBRID NANOFLUID FLOW IN A HORIZONTAL PIPE UNDER CONSTANT HEAT FLUX. Journal of the Technical University of Gabrovo. 72 (2026) 34-38. http://doi.org/10.62853/MUBG8779
  1. OPTIMIZATION OF SURFACE ROUGHNESS IN MILLING ALUMINUM 7075-T6 USING THE TAGUCHI METHOD
  2. VIBRATION-BASED TOOL CONDITION MONITORING AND AUTOMATIC FEED RATE CONTROL IN CNC MILLING MACHINES
  3. A COMPREHENSIVE OVERVIEW OF THE MECHANICS AND APPLICATIONS OF DOUBLE-BEAM SYSTEMS
  4. THE DESIGN AND THERMAL ANALYSIS OF A HIGH-SPEED TRAIN BRAKE DISC

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