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

Walnut (Juglans regia L.) is the most widespread walnut in the world. All parts of the plant are important: bark, leaves, dried and green peel of the fruit, septum, core. The benefits of walnuts are due to the presence of phytochemicals such as flavonoids, carotenoids, alkaloids, polyphenols, etc. In addition to the many benefits that walnut has on our health (antibacterial, antioxidant), it also has important phytosanitary and insecticidal properties. Walnuts can be used because of their plant-friendly properties in the form of biopesticides that are safe and can be a viable, inexpensive and cleaner alternative to synthetic products that can be harmful to the environment. This review paper seeks to bring to the fore the available literature on Juglans regia directed on the properties, antifungals and insecticides with action on plants and antibacterials with action on the human body, as well as mathematical models regarding the multiplication of microorganisms.
</abstract>

Walnut (Juglans Regia): A Review of Phytosanitary Properties and Theirs Mathematical Modeling

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

The recent use of digital Distributed Ledger Technology (DLT) in the healthcare domain can surpass the existing limitations in the centralized IT systems, such as the lack of security, access control or immutability of the electronic health information. If we discuss about clinical information, this innovative informatics advance gives back the control to the data owner. In decentralized environments, smart contracts allow trustable agreements grounded by irreversible transactions, which permit transparency and traceability. Moreover, smart contracts are the living heart of the decentralized applications that run on DTL. In this work, our attention is focused on medical equipments that helps health staff to diagnose and treat patients keeping much of their clinical data taken in dynamics. Hence, we propose a smart contract-based decentralized application framework for the management of devices, targeting also medical services, meant to facilitate the interaction of the involved entities. Our testing environment is the Ethereum platform, extensively used recently in the healthcare domain, being itself a smart operating system that allows decentralized applications to run on it.
</abstract>

“Ştefan cel Mare” University of Suceava

“Grigore T. Popa” University of Medicine and Pharmacy

Medical Devices Management System Based on Blockchain Technology

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

The present manuscript presents a theoretical study for the corrosion process. Corrosion processes are primed and stimulated in 60% of cases by chemical and biological elements. One of the most used biological elements are: bacteria, actinomycetes, microscopic fungi, algae. Corrosion of a solid body results from the transformation of structural bonds in that body. Less than certain influences (water, oxygen, light, etc.) the atom - which is practically neutral - can lose or gain electrons and it is ionized.
Brake pads are affected of corrosion process. The conceptions and mathematical symbols serve as the models building blocks. Authors like, Boz M, and other authors demonstrate in their researches that starting with the concept of number, where every mathematical object is a mathematical model.
In practice it is not possible to reproduce some experimental, theoretical conditions related to corrosion processes. These processes are therefore, to some extent, different in terms of the applicability of theoretical laws. From a thermodynamic point of view, metals are not stable and due to corrosion, metals tend to return to the stable form of oxides with the help of oxygen and moisture in the air. For this each metal requires certain ionization energy.
When establishing the mathematical model, those characteristics of the modeling object are highlighted, which, on the one hand, are informative, and on the other hand, they admit the mathematical form review.
</abstract>

“Vasile Alecsandri” University of Bacău

Faculty of Engineering, Department of Engineering and Management, Mechatronics

Faculty of Engineering, Department of Chemical and Food Engineering

A Review of Metallic Materials Corrosion

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

The aim of this paper is to investigate the coupled oscillations of multiple bubbles within a cluster. The interaction between a bubble and the other bubbles in a cluster produces an additional mass. For a fixed number of bubbles and uniformly distributed (<italic>N</italic> ---gt------gt--- 1), in case of a certain value of the bubbles number density, we deduce the relations analogous to the Eddington relation (between the cluster radius and the bubble radius) and the Sciama relation (between the cluster radius and the gravitoacoustic radius) according to Mach’s Principle.
</abstract>

Retired lecturer, Petroleum-Gas University of Ploieşti

Mach’s Principle in the Acoustic World

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

The problem of clogging membrane pores has become an area of interest for the vast majority of researchers in the field, because according to the literature, membrane materials are very sensitive when it comes to clogging and blocking pores.
Therefore, this paper briefly describes the problems that occur during the process of obstruction the pores of the membrane. Models and characteristics of pore blocking mechanisms have also been developed.
It is essential to mention that the principal purpose of the paper, which which consisted to review the simulations and classical models that were optimized, used in the analysis processes of clogging of membrane materials, was successfully fulfilled.
According to those mentioned, the combined mathematical models of pore blocking (methods combined with three blocking mechanisms using Hagen-Poiseuille’s law or standard 0-order blocking) have proven to be very effective in describing membrane clogging problems.
</abstract>

General Considerations Related to the Membrane Material Locking Models ‒ A Short Rewiew

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The paper demonstrates that a liquid becomes inhomogeneous in interaction with an oscillating bubbles cluster. Because the refractive index of the liquid around the cluster has a radial variation, a spherical acoustic lens is generated. Under certain restrictive conditions, the acoustic lens behaves like an acoustic black hole.
</abstract>

Acoustic Black Hole Generated by a Cluster of Oscillating Bubbles

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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 2 (June 2022)

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

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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/ 