GROWTH OF GIANT MICELLAR AGGREGATES: QUANTITATIVE THEORY VS EXPERIMENTS

  • TITLE: GROWTH OF GIANT MICELLAR AGGREGATES: QUANTITATIVE THEORY VS EXPERIMENTS
  • AUTHOR(S): K. Danov*, G. Radulova, M. Georgiev, P. Kralchevsky
  • ABSTRACT: The concentrated surfactant solutions have a wide application in industry, oil recovery, drug delivery, turbulent drag reduction, etc. The competition between the companies-producers has led to use of new kind of formulations to improve: washing action; skin and eye irritation; stability and durability; biodegradability; tolerance to hard water. Here, we present a review on the state of the art and our contributions to the molecular thermodynamic theory and experiment on the growth of giant micellar aggregates. Despite the considerable advances in theory and computer simulations, agreement with experimental data has been achieved only in isolated cases. Our predictive molecular thermodynamic approach accounts for the different contributions to the micellar scission energy in the case of nonionic, zwitterionic and ionic surfactant solutions and their mixtures. Excellent agreement was achieved between the theoretical model and experimental data for wormlike surfactant micelles at various concentrations of salt and temperatures. At high salt concentrations, the model also predicts loss of chemical equilibrium, which implies a transition to self-assemblies of other morphology or the onset of crystallization and phase separation. The results have applications for the design of new products and nanostructured materials.
  • DOI: https://doi.org/10.62853/SVFR4197
  • PAGES: 24-28
  • DOWNLOAD: GROWTH OF GIANT MICELLAR AGGREGATES: QUANTITATIVE THEORY VS EXPERIMENTS
  • HOW TO CITE THIS ARTICLE: Danov K., Radulova G., Georgiev M., Kralchevsky P. Growth of giant micellar aggregates: quantitative theory vs experiments. Journal of the Technical University of Gabrovo 66 (2023) 24-28

INDUSTRIAL ASSEMBLY LINE OPERATION

  • TITLE: INDUSTRIAL ASSEMBLY LINE OPERATION
  • AUTHOR(S): A. Taneva, D. Atanasova, K. Kutrynski, M. Petrov
  • ABSTRACT: The idea of this paper is to present basic components of a flexible assembly system (FAS), discuss it characteristics, classify the systems and describe an application. This equipment offers professional training according to the industrial reality, simulating a real assembly process and including different technologies from Industry 4.0. The FAS consists of an automated flexible assembly cell with five different stages: assembly, handling, quality inspection, transfer and warehouse. It is the ideal answer to research and training in industrial automation. The main advantage is that it has fully modularity in keeping with industrial reality. The technologies included in its different assembly modules, as well as the assembly process with several variants, allow the user to develop the professional skills required by advanced automation. In this work the conventional control approach is presented with programmable logic controllers (PLC) and SCADA level.
  • DOI: https://doi.org/10.62853/OZBT7176
  • PAGES: 16-23
  • DOWNLOAD: INDUSTRIAL ASSEMBLY LINE OPERATION
  • HOW TO CITE THIS ARTICLE: Taneva A., Atanasova D., Kutrynski K., Petrov M. Industrial assembly line operation. Journal of the Technical University of Gabrovo 66 (2023) 16-23

IMPLEMENTATION OF ROBOTIC AND ASSISTIVE TECHNOLOGIES IN THE PATIENT-CENTERED PHYSICAL REHABILITATION

  • TITLE: IMPLEMENTATION OF ROBOTIC AND ASSISTIVE TECHNOLOGIES IN THE PATIENT-CENTERED PHYSICAL REHABILITATION
  • AUTHOR(S): T. Tanev, P. Dachkinov, T. Valayil, M. Dimitrova, S. Kostova, A. Lekova
  • ABSTRACT: There is a necessity for a consistent framework for the integration of the robotic and assistive technologies for the purposes of the rehabilitation which covers the entire spectrum (preventative, restorative, supportive, palliative rehabilitation) and explores all aspects of the of the recovery process � physical, emotional, and mental while allowing for real-time adjustments and flexibility based on the individual patients� needs. In this paper we propose a set of tools for a rehabilitation solution that provides personalized care for the patients from the diagnose to the process of active recovery while measuring and evaluating the individual�s condition after surgery, injury or a trauma to restore and maximize the previous function. The main objective for implementing the assistive technologies into the physical therapy is to personalize the process of recovery based on the specific requirements of the patients. To achieve this, physical, emotional, and virtual devices are utilized mitigate and improve the physical and emotional challenges for the patients. In parallel with the implementation of the robotic technologies, custom-made 3D printed devices are also introduced and explored. To evaluate the effectiveness of the program, a 3-step methodology is applied � 1) diagnose of the patient, 2) implementation of the assistive technologies, 3) tracking the progress and making the necessary adjustments to the process and/or the devices.
  • DOI: https://doi.org/10.62853/GJMV4858
  • PAGES: 11-15
  • DOWNLOAD: IMPLEMENTATION OF ROBOTIC AND ASSISTIVE TECHNOLOGIES IN THE PATIENT-CENTERED PHYSICAL REHABILITATION
  • HOW TO CITE THIS ARTICLE: Tanev T., Dachkinov P., Valayil T., Dimitrova M., Kostova S., Lekova A. Implementation of robotic and assistive technologies in the patient-centered physical rehabilitation. Journal of the Technical University of Gabrovo 66 (2023) 11-15

THE CONCEPT OF THE STEP-BY-STUDY EVOLUTION OF SPINDLE MOTORS USING VENN-EULER DIAGRAMS

  • TITLE: THE CONCEPT OF THE STEP-BY-STUDY EVOLUTION OF SPINDLE MOTORS USING VENN-EULER DIAGRAMS
  • AUTHOR(S): Y. Kuznietsov
  • ABSTRACT: The evolution of creation and improvement of rotary drives of the main movement with their translational movement, beginning with aggregate machines and finishing with modern intelligent motor spindles for CNC machines is traced. Symbols for the circuit image of motor spindles are offered. Graphical representations of motor-spindle hybrids of different level of crossing using Venn-Euler diagrams are presented.
  • DOI: https://doi.org/10.62853/YPCO7318
  • PAGES: 07-10
  • DOWNLOAD: THE CONCEPT OF THE STEP-BY-STUDY EVOLUTION OF SPINDLE MOTORS USING VENN-EULER DIAGRAMS
  • HOW TO CITE THIS ARTICLE: Kuznietsov Y. The concept of the step-by-study evolution of spindle motors using Venn-Euler diagrams. Journal of the Technical University of Gabrovo 66 (2023) 7-10

MORPHOLOGICAL SYNTHESIS OF THE UNIVERSAL ROTARY WELDING DEVICE

  • TITLE: MORPHOLOGICAL SYNTHESIS OF THE UNIVERSAL ROTARY WELDING DEVICE
  • AUTHOR(S): Y. Kuznietsov
  • ABSTRACT: The analysis of known and proposed approach to the search for new universal rotary devices that can be used in subtractive and additive technologies is performed. It is emphasized that the use of the modular principle allows to significantly reduce the time and costs of creating universal rotating devices as part of a multifunctional smart mini-factory.
  • DOI: https://doi.org/10.62853/YELM2690
  • PAGES: 03-06
  • DOWNLOAD: MORPHOLOGICAL SYNTHESIS OF THE UNIVERSAL ROTARY WELDING DEVICE
  • HOW TO CITE THIS ARTICLE: Kuznietsov Y. Morphological synthesis of the universal rotary welding device. Journal of the Technical University of Gabrovo 66 (2023) 03-06