<abstract>
<title style='display:none'>Abstract</title>
The paper presents an overview of (i) the different polluting materials, classified according to their (bio)degradability, (ii) the sources of pollution (iii) the general effects of pollution on natural resources and on the economy and people’s health. The paper also summarizes directions/solutions to eliminate these effects, including “eco” technologies, and their effectiveness on environmental conservation and regional and global ecosystem protection, in the context of a clean and sustainable environment, in accordance with the 2030 Agenda for Sustainable Development.
</abstract>

Polluting Materials, the Effects of Industrial Pollution and Directions/Solutions to Eliminate these Effects

<abstract>
<title style='display:none'>Abstract</title>
The method of transporting cement with the help of an air jet through pipes is very practical and reliable. However, improper dimensioning of the constructive and functional parameters can lead to improper functioning, to cement agglomerations in certain areas of the route configuration. In order to be able to know the problem areas and geometries, in this paper a comparative, analytical and virtual study of cement transport through a pipeline route, known as geometry and dimensions, was made. Analytical calculation showed that a floating speed of cement particles of 23.45 m/s, with an air flow rate of 0.155 m3/s, is needed to be able to transport a quantity of 40 t/h (11.11 kg/s) of cement. The virtual study done in Flow Simulation showed the behavior of cement particles during transport. The virtual behavior is similar to the real one, with cement particles tending to settle in bends and on long stretches of horizontal pipes. The behavior of the air-cement mixture in the separation cyclone is well exemplified by the virtual simulation. The separation of those two components is well represented and conforms to the real phenomenon.
</abstract>

Comparative, Analytical and Virtual Study of the Flow Parameters of the Bearing Cement-Air Mixture, in a Pipeline Route

<abstract>
<title style='display:none'>Abstract</title>
The present work aims to study the adsorption processes and the photochemical depollution of the waters contaminated with Direct Orange textile dyes - 26 released into the water. Also, the paper shows the polysulfone (PSf) membranes, used for adsorption processes of the textile dyes azo - direct-orange-26, presenting the kinetics and experimental adsorption conditions for such processes. Advanced oxidation processes (AOP) processes used in photochemical depollution technologies are studied for water contaminated with Direct Orange 26 textile dye, after a preliminary adsorption process, with ZnFe2O4 ferrite photocatalysts.
</abstract>

Adsorption Processes Coupled with Photochemical Depolution of Waters Contaminated with Direct Orange-26 Azo Dye

<abstract>
<title style='display:none'>Abstract</title>
For human survival, the agri-food sector is fundamental, starting from the cultivation of the land to the production of food that ends up on our tables. Unfortunately, over time, this sector has faced numerous challenges, such as the appearance of pests, environmental pollution, short shelf life and, last but not least, inadequate packaging materials. All these challenges have led researchers from all over the world to find new alternatives to guarantee food safety. The application of nanomaterials, i.e. nanoparticles, could be the solution sought by all scientists. In recent years, nanotechnology has made remarkable progress, especially regarding the application of metallic nanoparticles and their synthesis methods. In particular, silver nanoparticles have attracted attention, due to their special antimicrobial, electrical and optical properties, but also to the fact that they can be combined with nondegradable, biodegradable and edible polymers. However, there are many concerns regarding the toxicity of these nanoparticles. This article aims to present some recent findings regarding the application of silver nanoparticles in food bio packaging.
</abstract>

Silver Nanoparticles in Food Bio Packaging. A Short Review

Editorial: (Nano)Science and (Nano)Materials in Materials Engineering and Mechanics

<abstract>
<title style='display:none'>Abstract</title>
The paper presents a structural analysis of two pottery fragments belonging to the Hamangia phase III Ceamurlia culture, discovered in a settlement with several living levels on the northern shore of Lake Techirghiol, at the Minerva – Paloda Hill. From two ceramic fragments, fired in a reducing atmosphere, samples were taken to perform X-ray diffraction (XRD) and wavelength‐dispersive X-ray fluorescence spectra (WDXRF) analyzes to determine the crystalline structure and composition of the ceramic materials. Digital optical microscopy was used to observe the details of the fracture surfaces of these ceramic fragments. This work contributes to the knowledge of the techniques and materials used by the Hamangia civilization in the manufacture of ceramic vessels.
</abstract>

Structural Analysis of Some Pottery Fragments Belonging to Hamangia (Phase III) Culture

<abstract>
<title style='display:none'>Abstract</title>
Lignocellulose material is the main natural resource for the pulp and paper industry, and for its application the material should have a degree of whiteness as high as possible. For this reason, different bleaching treatments were applied during time. In this paper, the photobleaching induced by solar light of a lignocellulosic biomass using NaClO was studied. The colorimetric measurements, UV spectra absorption, and FTIR spectra changes are evaluated and discussed in this paper. The changes of L*a*b parameters can be considered a proof of the reactions generated by hypochlorite radicals during solar light exposure, leading to a biomass whitening.
</abstract>

Solar-Driven Photobleaching of Lignocellulosic Biomass

<abstract>
<title style='display:none'>Abstract</title>
This paper establishes the neutral surface position of a circular plane plate with radial nervures, considering anisotropic structures theory. The nervures have a constant thickness and linear variable high along the length. At the same time this paper presents the cylindrical flexural rigidity of a such structure. The obtained theoretical data represent a development of a plate study with constant thickness and height nervures, assembled on a single face. The effect of welding on global rigidity of the plate is neglected. A numerical example of such a plate is made.
</abstract>

Neutral Surface Position of a Circular Plane Plate with Radial Ribs

<abstract>
<title style='display:none'>Abstract</title>
The paper aims to conduct a novel investigation of ceramic samples from the Trophaeum Traiani Monument in Romania using various nuclear analytical techniques such as WDXRF, XRD, neutron diffraction, and neutron tomography, which will be complemented by FTIR and Raman spectroscopy data. The experimental data gathered revealed the mineral and chemical composition of the object’s surface, identifying quartz, hematite, calcite, and graphite. The employment of non-destructive techniques with high penetration capabilities is adequate in examining the spatial distribution and phase composition of the samples, providing valuable insights into their composition and structure without altering their integrity.
</abstract>

3D Reconstruction and Nuclear Analytical Investigations of Tropaeum Traiani Monument, Adamclisi

<abstract>
<title style='display:none'>Abstract</title>
In this paper, a technology for obtaining powdery materials with special characteristics, in the metallurgical field, is presented. The compositions of these powders are from the calcium oxide - alumina - silica system, by adding CaF2, Na2O and C. The choice of oxide compositions will be made according to a series of parameters: the composition of the cast steel, the casting speed, the viscosity or the surface tension of molten steel.
</abstract>

The Role of Powder Used in the Continuous Molding of Alloys

Editorial

<abstract>
<title style='display:none'>Abstract</title>
Measuring and characterizing surface properties represents one of the most important aspects in manufacturing processes. In this paper, it has been shown that the factorial design of experiments combined with regression techniques can be applied to evaluate the roughness of machined surfaces with different cutting parameters.
</abstract>

Surface Roughness Prediction Techniques in Turning Processes

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Scientific Bulletin of Valahia University - Materials and Mechanics

The Scientific Bulletin of Valahia University - Materials and Mechanics (SBMM) is is a bi-annual multi-disciplinary journal that publishes cutting-edge research across the entire...

The Scientific Bulletin of Valahia University - Materials and Mechanics (SBMM) is is a bi-annual multi-disciplinary journal that publishes...