<abstract xmlns="http://www.w3.org/1999/xhtml">

Airborne viruses, bacteria, or toxins are dangerous because of the nature of the human transmission pathway through breathing. However, every airborne component must conform to the laws of physics governing atmospheric propagation. Given the fact that most atmospheric flows, at both ground level and throughout the atmosphere, are highly turbulent, the mechanisms of turbulence can be employed to understand the propagation of such components. In this paper, the problem of harmful airborne pathogen transmission is considered in the context of atmospheric turbulence and wall-bounded flow theory. Two approaches are considered: one of them relies on singular measurements of building boundary distances and morphology, and the other relies on constant temperature measurement. The theoretical and practical potential of these approaches is then discussed and explained in a larger urban context.
</abstract>

“Ion Ionescu de la Brad” University of Agricultural Sciences and Veterinary Medicine

Department of Exact Sciences, Faculty of Horticulture

“Alexandru Ioan Cuza” University of Iaşi

“Gheorghe Asachi” Technical University of Iaşi

Employing Atmospheric Sensors and Turbulent Energy Cascade Theory to Quantify Hazardous Airborne Transmissibility

<abstract xmlns="http://www.w3.org/1999/xhtml">

The nature of chaos is elusive and disputed, however it can be connected to sensitivity to initial conditions caused by nonlinearity of the equations describing chaotic phenomena. A nowhere-near comprehensive list of such equations can still be shown: the Boltzmann equation, Ginzburg-Landau equation, Ishimori equation, Korteweg-de Vries equation, Landau-Lifshitz-Gilbert equation, Navier-Stokes equation, and many more. This disproportionality between input and output creates an analytically-difficult situation, one that is complicated both algebraically and numerically – however, the study of equations that are both simple and chaotic may yield useful connections between algebraic complexity and chaos. Such connections can be used to determine the simplest possible chaotic function, which can be used as a “chaotic operator” for various non-chaotic or chaotic functions, thus reducing the problem of chaos to one based strictly on algebra.
</abstract>

On the Study and Possible Applications of Minimally Complex Chaos

<abstract xmlns="http://www.w3.org/1999/xhtml">

In this paper we propose a new tumor growth model, based on the original model developed by Anderson-Chaplain to which we attached Ivancevic’s “butterfly” time attractor. The chaotic behavior provides a more realistic perspective on tumor growth, with uncertainties and uncontrollable long term stochastic effects.
</abstract>

“Grigore T. Popa” University of Medicine and Pharmacy

Faculty of Medicine, Biophysics and Medical Physics Department

A Tumor Growth Model with a „Butterfly” – Type Chaotic Time Attractor. Cancer Evolution Through a Traveling Waves-Type Mechanism

<abstract xmlns="http://www.w3.org/1999/xhtml">

In the framework of the Scale Relativity Theory, a fractal Korteweg-de Vries-type equation for describing dispersive behaviours of any complex structure is obtained. In the one-dimensional case, the general solution of this equation show that the dispersive behaviours of any complex structure are given by means of cnoidal oscillation modes. Through these modes degeneration, dispersive behaviours of soliton, soliton-package, harmonic etc. result.
</abstract>

Dispersive Behaviours in Complex Structures

<abstract xmlns="http://www.w3.org/1999/xhtml">

In Physics, hidden symmetries can either be employed to describe special systems and configurations, or even be used as a basic block of a theory itself. In this paper, a special hidden symmetry of a physical field propagation phenomenon, having strong implications in the interactions theories (a classical Fresnel-type image of light propagation) is analyzed.
</abstract>

Faculty of Medicine, Biophysics and Medical Physics Department, Iaşi

A “Hidden” Symmetry and Some of Its Implications

AHEAD OF PRINT

Volume 70 (2024): Issue 1 (January 2024)

Volume 69 (2023): Issue 1-4 (December 2023)

Volume 68 (2022): Issue 4 (December 2022)

BULETINUL INSTITUTULUI POLITEHNIC DIN IAȘI. Secția Matematica. Mecanică Teoretică. Fizică

Volume 68 (2022): Issue 1 (March 2022)

Volume 67 (2021): Issue 4 (December 2021)

Volume 67 (2021): Issue 3 (September 2021)

Volume 67 (2021): Issue 2 (June 2021)

Volume 67 (2021): Issue 1 (March 2021)

BULLETIN OF THE POLYTECHNIC INSTITUTE FROM IAȘI, Section Mathematics, Theoretical Mechanics, Physics – BIPMF (ISSN-L 1224-7863) is an international journal, with quarterly appearance, for the free publication of research results in theoretical and mathematical physics, mechanics, technical and applied physics, material sciences.  The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes physics, mechanics and mathematics, and given their importance in material sciences, interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, surfaces/interfaces are welcomed if they demonstrate insight into physics, seeking to understand mathematical basis of physical phenomena, and solve problems in physics via mathematical approaches. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.  BIMMF aims to enhance the interdisciplinary research by connecting the fundamental sciences as physics and mathematics with applicative research concerning the relationships between structure, processing, properties, and performance of materials. It also promotes international exchange of scientific activities.  The journal publishes original research, focused review articles that examine the state of the art, book reviews, technical notes, case studies, and preliminary communications, with no restriction on the length of the papers.  Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. sistemantiplagiat.ro/ 