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        <title>Scientific Bulletin of Valahia University - Materials and Mechanics Feed</title>
        <link>https://sciendo.com/journal/BSMM</link>
        <description>Sciendo RSS Feed for Scientific Bulletin of Valahia University - Materials and Mechanics</description>
        <lastBuildDate>Sun, 10 May 2026 13:18:13 GMT</lastBuildDate>
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            <title>Scientific Bulletin of Valahia University - Materials and Mechanics Feed</title>
            <url>https://sciendo-parsed.s3.eu-central-1.amazonaws.com/647111102b88470fbea14b45/cover-image.jpg</url>
            <link>https://sciendo.com/journal/BSMM</link>
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        <copyright>All rights reserved 2026, Valahia University of Targoviste</copyright>
        <item>
            <title><![CDATA[A Study on Stability of Magnetite Nanoparticles Suspension in Water by Zeta Potential Measurements]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0014</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0014</guid>
            <pubDate>Sat, 06 Dec 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

The paper presents an experimental research on the stability of an aqueous suspension containing 35% magnetite nanoparticles (MNPs) using the zeta potential measurement method. The main objective of this study is to determine the variation of zeta potential as function of the suspension’s alkalinity. By charging the surfaces of magnetite nanoparticles with negative hydroxyl groups, they produce electrostatic repulsion between magnetite nanoparticles and prevent short- and medium-term magnetic agglomeration and sedimentation. Alkalinising together with ultrasonication treatment are effective methods for stabilising magnetite nanoparticles suspensions used as ferrofluids.
]]></description>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[Epoxy-Organic Composites: A Review on Sustainable Reinforcements, Processing, Properties, and Applications]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0015</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0015</guid>
            <pubDate>Sat, 06 Dec 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

This article offers a thorough review of recent scientific research on the synthesis, characterization, and performance of epoxy-based composite materials reinforced with organic components. It critically evaluates progress made in the past decade in development of composites that incorporate natural fibers, agricultural byproducts, biodegradable polymers, and other bio-derived fillers. By analyzing the existing literature, the review discusses various processing techniques, structural features, and the mechanical, thermal, and chemical properties of these composites. It highlights how organic reinforcements affect the performance of epoxy matrices. The primary objective is to provide an updated overview of current knowledge in epoxy-organic composites, highlighting emerging trends, key challenges, and opportunities for sustainable innovation. The article also compares findings from multiple studies to clarify the relationships between reinforcement types, interfacial interactions, and composite behavior. Furthermore, it underscores the potential of bio-based and hybrid epoxy composites as eco-friendly alternatives to traditional synthetic materials, supporting the global shift toward circular and low-carbon material engineering.
]]></description>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[Experimental Evaluation of the Instability Threshold of Vertical Cylindrical Vessels]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0019</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0019</guid>
            <pubDate>Sat, 06 Dec 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

The present paper presents an experimental analysis of the structural behavior of vertical cylindrical vessels subjected to increasing axial loads, with the aim of determining the critical instability threshold. The study focuses on identifying the conditions under which buckling or loss of stability phenomena occur, considering the influence of geometric parameters, material and support conditions. The experiments were performed on certain prototypes, using high-precision measuring equipment to monitor deformations and stress distribution. The obtained results were compared with theoretical predictions and numerical models, highlighting the differences between the idealized and real behavior. The conclusions of the study contribute to improving the design criteria for vertical cylindrical structures and provide recommendations for preventing instability in industrial applications
]]></description>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[Comparative Study of Stresses Due to Forced Mounting of a Shaft Located on Four Bearings for Three Cases: Coaxial Bearings, Rigid Non-Coaxial Bearings and Elastic Non-Coaxial Bearings]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0017</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0017</guid>
            <pubDate>Sat, 06 Dec 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

The paper presents a comparative study of the stresses that occur for three cases of shaft mounting in a speed reducer: the maximum stresses in a continuous beam located on four coaxial rigid supports, the maximum stresses in the same beam located on four coaxial rigid supports and the maximum stresses in the same beam on four non-coaxial rigid and elastic supports. In the first case of shaft mounting, it is mounted on four bearings with non-coaxial and rigid support, in the second case, the shaft is mounted on the four coaxial and rigid bearings, and in the third case the shaft is mounted on four bearings with non-coaxial rigid and elastic end bearings, the intermediate bearings being mounted in the support by means of elastic elements. The statically indeterminate problem is solved in this paper using the load function method ψ from Strength of Materials and the numerical calculation is done for a particular numerical case, using the step function Φ(x-a) from the professional program MATHCAD. The solution method allows the numerical calculation of reactions, the drawing of internal stress diagrams and the calculation of maximum stresses in the dangerous section.
]]></description>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[Evaluation of Silver-Modified ZnAl-Layered Double Hydroxide Coatings for Photocatalytic Self-Cleaning of Mortar Substrates]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0012</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0012</guid>
            <pubDate>Sat, 06 Dec 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

The preservation of stone and mortar elements in cultural heritage structures is increasingly challenged by environmental degradation, pollution, and biological fouling. Photocatalytic coatings represent a promising approach for developing self-cleaning and pollutant-degrading surfaces. In this study, a silver-modified ZnAl-layered double hydroxide (Ag@ZnAl-LDH) was synthesized via coprecipitation and applied as a coating on mortar substrates. The structural and compositional characteristics of the prepared materials were investigated using X-ray diffraction (XRD) and wavelength-dispersive X-ray fluorescence (WDXRF). The XRD pattern confirmed the formation of a ZnAl-LDH phase (JCPDS 48-1022) with carbonate as the main interlayer anion, along with additional reflections attributed to ZnO (JCPDS 99-0111) and silver-containing species. The photocatalytic activity was evaluated through the degradation of methylene blue under natural illumination (700 W/m²), monitored via CIELAB colorimetric parameters. The results demonstrated that Ag@ZnAl-LDH coatings promote the photodegradation of organic dyes, indicating potential for developing functional, self-cleaning coatings for the protection of heritage materials.
]]></description>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[Study of Solicitation States at Circular and Isotropic Plates]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0020</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0020</guid>
            <pubDate>Sat, 06 Dec 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

In this paper we make a comparison between displacements and stresses of a circular and isotropic plate, which is solicitated at a pressure, using the analytical method and the same parameters obtained with finite element method. In this last case, the plate belong to the respectively recipient. From the two methods, we can conclusion that the results obtained both analytical and Cosmos Finite Element Method are appropriated.
]]></description>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[Editorial]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0011</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0011</guid>
            <pubDate>Sat, 06 Dec 2025 00:00:00 GMT</pubDate>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[Irrigation System for Agricultural Land. A Short Review]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0013</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0013</guid>
            <pubDate>Sat, 06 Dec 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

The study is the subject of doctoral research, the purpose of which is to design and implement a sprinkler irrigation system, a system with a dual function, that of irrigating urban and rural areas, soils, agricultural lands and, respectively, that of extinguishing in the event of a vegetation fire, using innovative nanotechnological procedures and advanced nanomaterials.
The main objective of the research is that both the partial results and the final result of the research are free of toxicity for humans, animals and the environment, considering the purpose of its use. In this regard, the experimental research will be carried out in accordance with the OECD guidelines on testing and with other internationally recognized and validated testing methods in the field of nanotechnology.
The work has the following objectives, in perspective:
- design and development of a “Kit - prototype treatment of sprinkler and the equipment of the watering system with a dual function, for irrigation and/or intervention in emergency situations”, with generalized implementation in the Romanian Plain and with experimental application in Talpa Commune, Teleorman County;
- making, development of a nanomaterial (polymer film of the type gel, paint, varnish etc.), through innovative nanotechnology, with the capacity, ability to cover different types of surfaces (metallic or non-metallic – e.g. plastic, glass, ceramics, etc.), for the anti-corrosive, flame retardant (fireproof) and intumescent treatment of the watering system, in order to protect against oxidative factors of the environment and passive fire protection;
- use of components and a finished product that are non-toxic to humans and nature;
- the use of common components, easy to obtain, procure, purchase and with a low cost;
- miscibility of components;
- easy application by brushing or spraying;
- making the sprinkler and the watering system equipment from components with metallic and/or non-metallic surfaces treated anti-corrosively, fireproof and intumescently with innovative nanomaterials.
This documentary represents the first stage of scientific research, namely the study of specialized literature in the fields of: environment - climate and desertification, nanotechnology - nanostructured materials, agronomy and agriculture - irrigation.
]]></description>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[Wear Management of Abrasive Wheels in CNC Grinding. Comparative Analysis of the Performance of Sharpened Abrasive Wheels]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0018</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0018</guid>
            <pubDate>Sat, 06 Dec 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

The objective of the work is to conduct experimental research to correctly manage the phenomenon of abrasive stone wear in the grinding process of bearings on CNC machines, through their correct and efficient sharpening. To this end, the quality of the ground surfaces with different sharpening regimes is evaluated to identify those optimal working conditions.
]]></description>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[Hard Chromium Plating: Technological Challenges, Engineering Approaches, Automation and Innovative Solutions for Optimized Industrial Processes]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0016</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0016</guid>
            <pubDate>Sat, 06 Dec 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

This paper analyzes the evolution of chromium plating installations, from empirical and traditional methods to modern continuous systems, emphasizing the technological, economic, and ecological differences. Hard chromium plating, an essential electrochemical process for enhancing wear and corrosion resistance, has faced major limitations in its conventional form: high energy consumption, non-uniform deposits, and significant risks to the environment and workers’ health. Modernization through the implementation of continuous plating systems, based on horizontal bar movement and strict control of electrochemical parameters, has brought substantial advantages: reduced electrolyte volumes, improved deposit quality, optimized energy consumption, and minimized environmental impact. Romania, as a European leader in chromed bar production, directly benefits from these advancements, consolidating its industrial competitiveness and strategic position on the international market.
]]></description>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[Thermoanalytical Analysis of Sacidava Ceramics]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0003</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0003</guid>
            <pubDate>Wed, 30 Apr 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

The present paper is a brief review of the techniques based on thermal analysis applied in the context of the characterization of art and archaeological objects, exemplified by various case studies. Thermal analysis methods as TGA correlated with scanning electron microscopy and energy dispersive X-ray microanalysis (SEM-EDS) and porosity measurements were used to investigate the thermal behavior and surface morphology of some ceramic pieces taken from the archaeological site of Sacidava. Upon progressive heating in a static air atmosphere and in the temperature range 20-800 °C, all investigated materials present three main successive processes, associated with dehydration and thermo-oxidative degradations. Clay minerals, as the main material for the production of ceramics and pottery, exhibit some characteristic reactions (dihydroxylation, decomposition, transformation) during firing (heating effects) and several thermoanalytical criteria can be used to reconstruct the previous production conditions.
]]></description>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[Phase Detector for Laser Phase Perturbation Demodulation]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0005</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0005</guid>
            <pubDate>Wed, 30 Apr 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

Laser interferometry is a powerful tool for vibration measurement. It makes it especially suited for measurement of small vibrations which would otherwise be interfered with by contact-based methods.This paper is devoted to the design and implementation of a phase detector for LASER phase perturbation demodulation. Based on self-mixing interferometry, the detector achieves vibrations measurements using the fringe counting method. The paper covers design of a LASER driver, a transimpedance amplifier and an output filter. With a bandwidth of over 200 kHz, the detector is designed to measure vibrations larger than half a wavelength of the lasing frequency. This translates to small vibrations as small as a few micrometers for a red LASER diode for example. In the later part of the report, the detector sub circuits are tested and analysed. The complete detector is however not tested for vibration measurements having failed to acquire the appropriate LASER diode in time. Nevertheless, the vibration testing procedure is presented and ways on automating and improving the sensitivity of the detector discussed.
]]></description>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[Study of the Dependence Between the Belts Width and the Loading Method of Granular Materials in the Case of Conveyors Belt]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0009</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0009</guid>
            <pubDate>Wed, 30 Apr 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

In this study we will focus on the problems that arise due to the high travel speeds that the piston of a hydraulic motor develops during operation. These speeds lead to an increase in the value of the kinetic friction coefficient.
The study of the dependence of belt width on the loading method of the material on the belt of equipment for transporting granular materials is essential for optimizing the efficiency and safety of belt conveyors. Here are some important aspects:
1. Belt width: This influences the transport capacity and the stability of the material on the belt. A wider belt can transport a larger amount of material but also requires a more robust support system.
2. Loading method: The way in which the material is loaded on the belt affects the weight distribution and the stability of the transport. Uniform loading prevents the accumulation of material and reduces the risk of skidding or blocking.
3. Type of material: The properties of the transported material, such as density and friction angle, influence the choice of belt width and loading method. Granular materials with high friction angles require belts with special surfaces to prevent them from slipping.
4. Belt configuration: Belts can be flat or trough-shaped, depending on the conveying needs. Trough-shaped belts are more effective for conveying granular materials because they offer greater stability.
These aspects are essential for the efficient design and operation of belt conveyors in various industries.
]]></description>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[Mathematical Method to Unfold an Oblique Pyramid]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0010</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0010</guid>
            <pubDate>Wed, 30 Apr 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

In this paper a mathematical method for calculating the unfolding of an oblique pyramid is shown. The real dimensions of the edges and the angles between the edges of the pyramid, too, are found out with this method. For this, we use the program AutoCAD 2002 and for mathematical calculations we use the program Mathematica 5.0.
]]></description>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[The Influence of the Rigidity of Flexible Wires on the Proper Pulsations of an Elastic System with One Degree of Freedom Formed from Homogeneous Wheels and Bars, Springs and Inextensible and Extensible Wires]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0008</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0008</guid>
            <pubDate>Wed, 30 Apr 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

The paper aims to study the influence of the stiffness of flexible connecting wires on the free natural pulsations of an elastic system with one degree of freedom formed by wheels and homogeneous bars, springs and flexible wires for two cases:
a) when they are considered inextensible and 
b) when they are considered extensible, their flexibility being proportional to their length. With the help of the professional program MATHCAD, the influence of the relative stiffness of elastic wires subjected to traction, on the natural pulsations, for several variants of flexible and extensible wires, was simulated, using the parametric calculation of the natural pulsations.
]]></description>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[Dyes for Dye-Sensitized Solar Cells (DSSCs): A Review]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0001</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0001</guid>
            <pubDate>Wed, 30 Apr 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

Dye-Sensitized Solar Cells (DSSCs), also known as Grätzel cells, represent a promising technology in the field of solar energy. These cells convert solar energy directly into electrical energy in an efficient and environmentally friendly manner. A crucial component of these cells is the dye. The dye, essentially, acts as a molecular antenna, absorbing sunlight and thus initiating the energy conversion process. The absorption of a photon by the dye molecule elevates an electron to a higher energy level.This excited electron is then injected into a semiconductor, typically titanium dioxide (TiO₂), which acts as an electrode. The circuit is completed as an electron from the electrolyte replenishes the electron deficiency in the dye.
]]></description>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[The Influence of Thermal Treatments on the Mechanical Properties of Aluminum Bronzes]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0004</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0004</guid>
            <pubDate>Wed, 30 Apr 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

The purpose of the work is to present the influence of hardening and tempering heat treatments on the mechanical properties of aluminum bronzes.
After processing, the material was cast into metal shells in the form of bars with dimensions ø 40×300 [mm] and later these were subjected to thermal treatments of tempering (850-9000C) and holding for 120 minutes, and tempering (350-5500C) with holding time between 60-240 minutes. Subsequently, the mechanical properties, such as hardness and tensile strength, of aluminum bronzes were determined depending on the heat treatment parameters.
It is found that during the tempering treatment the values of the mechanical characteristics change significantly in relation to the tempering temperature and the holding time at this temperature, the holding time at the tempering temperature influencing the mechanical properties of the alloy. The analysis of the mechanical properties, hardness and breaking strength of the tempered samples, shows that for the range of tempering temperatures 700-8500C, these properties increase with temperature.
The experimental results indicated that the best operating characteristics for the analyzed alloy were obtained at a tempering temperature of 8750C and a holding time at the tempering temperature of 1 hour, with a tempering at a temperature of 4000C, with a holding time of 90 minutes. Quenching and tempering heat treatment is a fundamental engineering process for improving the mechanical properties of metals, ensuring performance and reliability in various industrial and technological applications.
]]></description>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[Study of Shrinkage of Thermoplastics in Injection Molding]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0002</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0002</guid>
            <pubDate>Wed, 30 Apr 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

The article is devoted to problem of plastic materials deformation in process of production by injection molding. The stages of plastic processing are considered, including heating, melting, mold filling and subsequent solidification. The main types of shrinkage and key ways of measuring it are described. A series of experiments using polypropylene, high-density polyethylene and two modifications of polyvinyl chloride are carried out. The influence of processing temperature regimes and rheological characteristics of materials on final dimensional parameters of products has been investigated. Correlation dependences between coefficient of thermal expansion, range of working temperatures of mold and yield index for each type of polymer have been established. The optimum technological modes providing minimum geometrical deviations of finished parts have been revealed. The results of study can be used to improve technological processes and increase accuracy of manufacturing polymer products of complex configuration.
]]></description>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[Studies on the Mechanical Stress Behavior of Polytetrafluoroethylene (PTFE) Used in the Construction of Mechanical Ring Elements]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0006</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0006</guid>
            <pubDate>Wed, 30 Apr 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

This paper presents the study of the mechanical behavior of polytetrafluoroethylene (PTFE) during tensile tests performed at different strain rates, using standard samples. Test pieces are measured using a non-contact video extensometer. This procedure is particularly precise, as large deformities are involved. The results are compared with a mathematical model to predict the mechanical behavior observed in the experiments. The main objective is to predict the stress-strain curve at different strain rates (6.0 × 10−4, 7.7 × 10−2, 9.2 × 10−2 and 1.3 × 10−1 s−1) using model equations that combine enough mathematical simplicity to allow their use in engineering problems with the ability to describe complex nonlinear mechanical behavior.
The material constants (PTFE) that appear in the model equations can be easily identified from tests performed at constant and different strain rates. The virtual studies were carried out using the FEM program under the Solidworks software (Simulation) in which a virtual material was created with the mechanical properties of the analyzed material. The studies contain simulations of tensile, bending and impact tests according to standardized standards.
]]></description>
            <category>ARTICLE</category>
        </item>
        <item>
            <title><![CDATA[Structural and Chemical Investigations On SiO2-Cao-P2O5 Bioactive Glass Composition]]></title>
            <link>https://sciendo.com/article/10.2478/bsmm-2025-0007</link>
            <guid>https://sciendo.com/article/10.2478/bsmm-2025-0007</guid>
            <pubDate>Wed, 30 Apr 2025 00:00:00 GMT</pubDate>
            <description><![CDATA[

The glass obtained by the sol-gel method was immersed in a simulated body fluid solution, in order to observe the structural and morphological changes on its surface. Infrared spectroscopy - FTIR and electron microscopy SEM analyses showed the formation of apatite on the surface of the synthesized glass.
]]></description>
            <category>ARTICLE</category>
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