Arhivă — Seria B

1

NOVEL LC–MS/MS-BASED METHOD FOR THE QUANTIFICATION OF ORGANIC UV FILTERS FROM SUNSCREEN FORMULATIONS IN FISH ORGANS AND TISSUES

Valentina-Andreea PETRE, Camelia UNGUREANU, Stefania GHEORGHE, Florentina-Laura CHIRIAC

Benzophenones are widely used as organic UV filters in sunscreens and cosmetic products. Their increasing occurrence in aquatic environments has raised concerns due to their potential endocrine-disrupting effects. Consequently, sensitive and reliable analytical methods are required for their determination at trace leve…

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2

INFLUENCE OF PRECURSOR CHEMISTRY ON PHASE FORMATION AND MORPHOLOGY OF SOL-GEL DERIVED BAGHDADITE

Ștefania CARAMARIN, Gabriela-Florentina IONIȚĂ, Miruna-Adriana IOȚA, Dumitru-Valentin DRĂGUȚ, Elena BACALUM, Laura-Mădălina CURSARU, Georgeta VOICU, Ștefania-Paula STOLERIU

Ca3ZrSi2O9, commonly known as baghdadite, is a bioactive ceramic material with great potential in bone tissue engineering applications. In this study, baghdadite powders were synthesized using a sol-gel method with different combinations of calcium (nitrate, chloride) and zirconium (nitrate, chloride) precursors, follo…

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3

ELECTROANALYSIS OF VITAMIN B6

Ergün-Yukmel RAŞIT, Raluca-Ioana STEFAN-VAN STADEN, Damaris-Cristina GHEORGHE, Ruxandra-Maria ILIE-MIHAI

Vitamin B6 is a significant member of the B-vitamin complex. It has an important role especially in brain development and in the nervous system’s health. A sensor based on graphite nanopowder and chitosan was developed, characterized, and validated for the quantification of vitamin B6 in pharmaceutical products and ora…

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4

DYNAMICS OF METHANE CONTENT IN BIOGAS DURING ANAEROBIC DIGESTION FOLLOWING A GLYCEROL PULSE ADDITION

Andra-Maria LĂCUREANU, Diana Mariana COCÂRȚĂ, Florin NENCIU

This research study investigated the feasibility of adding 1% (v/v) glycerol from the biodiesel industry to a substrate mixture of sewage sludge, manure, and paper waste that was used in the anaerobic digestion process. The highest methane (CH₄) percentage (31.6%) was identified on the second day after the introduction…

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5

CHEMICAL CHARACTERIZATION AND SOURCE LEVEL REDUCTION OF ODOR ACTIVE COMPOUNDS (NH₃ AND H₂S) IN A NON-HAZARDOUS WASTE DRYING FACILITY

Cristian CONSTANTIN, Cristina MODROGAN, Annette Madelene DĂNCILĂ, Gabriela Geanina VASILE, Maria Lavinia MOISE, Valeriu DANCIULESCU

This study evaluates odor, ammonia (NH₃), and hydrogen sulfide (H₂S) emissions from a mechanical treatment and drying installation for non-hazardous waste, in relation to the implementation of a deodorization system. Measurements and AERMOD dispersion modeling were used to assess both source-level emissions and ground-…

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6

DEVELOPMENT OF WATER-SOLUBLE FOOD PACKAGING FROM PVA AND MUNG BEAN HULL AGROWASTE

Andra-Gabriela ZORCĂ, Alessia-Ioana ENESCU, Ion Sorin JINGA, Cristina BUSUIOC, Iuliana Mihaela DELEANU

Poly(vinyl alcohol) (PVA)-based films containing mung bean paste, potassium sorbate, and ultrasound-treated mung bean paste were developed and characterized. Increasing PVA content increased water solubility (average dissolution time of 49 min) and swelling degree (50–240%). Water vapor permeability ranged from 0.2039 …

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7

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF B4C-GNP COMPOSITES PREPARED BY SPARK PLASMA SINTERING

Gultekin GOLLER, Yigit Orkun AYDOGAN, Iulian ANTONIAC, Goknur KARADENIZ, Omer BEDIRHAN, Irem CETINKAYA

This study investigates the effect of graphene nanoplatelet (GNP) reinforcement on the densification, microstructure, and mechanical properties of boron carbide (B 4C) ceramics. B4C–xGNP (x = 0.5, 1, 2, and 3 vol.%) composites were fabricated by spark plasma sintering (SPS) at 1600 °C under 40 MPa for 5 min. The highes…

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8

MOLECULAR MODELING AND COMPUTATIONAL SCREENING OF URIDINE DERIVATIVES FOR ANTIVIRAL POTENTIAL AGAINST CHIKUNGUNYA VIRUS

Toahira EAKIN, Sarkar M. A. KAWSAR

Uridine and its derivatives are significant macromolecules with substantial therapeutic potential due to their various biological actions, such as their antiviral, antibacterial, and anticancer qualities. This study used computational techniques to examine recently synthesized uridine derivatives. DFT was used to optim…

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9

EFFECT OF TiO2 PRECURSOR ON PHASE COMPOSITION AND PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE

Ana-Maria FULGHECI, Roxana-Doina TRUSCA, Ludmila MOTELICA, Cristina CHIRCOV, Denisa FICAI, Ovidiu-Cristian OPREA, Mihai NITA-LAZAR, Anton FICAI

In this study, we synthesized two TiO2 powders starting from two different titania precursors - titanium isopropoxide (TiO2 IP) and titanium (triethanolaminato) isopropoxide (TiO2 NH2), using the sol-gel method. The photocatalysts were structurally characterized using various techniques - Fourier-transform infrared spe…

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10

STRENGTH AND WATER-UPTAKE-RELATED MASS-GAIN RESPONSE OF CEMENT MORTAR MODIFIED WITH 700 °C CORN STRAW ASH AND NaOH-PRETREATED CORN STALK FIBER

Bo PENG, Hongyan LIN, Kai LI, Meiyu ZHENG

This study investigated cement mortar modified with 700 °C corn straw ash (CSA) and NaOH-pretreated corn stalk fiber (CSF), using natural river sand. CSA contents and CSF volume fractions of 0.5–2.0 vol.% were evaluated through strength tests, water-uptake-related mass gain, replicate statistics, and ANOVA. The highest…

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11

SYNTHESIS OF FREESTANDING POROUS ALUMINA AND METALLIC NANOWIRES BY ELECTROCHEMICAL METHODS

Stefania C. IONESCU, Cristina C. GHEORGHIU, Leonard FLOAREA, Daniel POPA, Victor LECA

Using electrochemical methods, porous alumina templates with thicknesses of tens of micrometers were synthesized from aluminum plates, on which copper nanowires were deposited, either on an aluminum substrate or on a thin gold film, to be used as targets for high-power laser experiments. Before the anodization process,…

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12

PREPARATION AND HIGH-TEMPERATURE HYDROGEN BARRIER PERFORMANCE OF Al₂O₃/ZrO₂ COMPOSITE COATINGS ON ZIRCONIUM HYDRIDE SURFACE

Zhiyuan WAN, Liwei CHEN, Jiayue SUN, Yanhua GENG

This study employed zirconium oxychloride and aluminum isopropoxide as precursors to prepare Zr-Al composite oxide hydrogen-resistant coatings on zirconium hydride surfaces using sol-gel technology. The effects of the Al2O3/ZrO2 molar ratio (1:1-1:5) on coating properties were investigated. The actual composition of th…

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13

PRELIMINARY SCREENING AND CHARACTERIZATION OF FOOD WASTE-DERIVED MATERIALS AS POTENTIAL ADSORBENTS AND BIOCHAR PRECURSORS

Daniela ION, Florentina Laura CHIRIAC, Ana-Maria LUNTRARU, Mihai STEFANESCU, Mihai NIȚĂ-LAZĂR

Water pollution caused by pharmaceutical residues is a growing issue. Conventional treatment processes do not remove all of these contaminants. Because of this, low-cost solution materials are being explored. Agri-food waste may be one option. In this study, walnut, avocado, potato, onion, and eggshells were investigat…

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14

INFLUENCE OF RECYCLED CONCRETE AGGREGATE TREATMENTS ON PORTLAND CEMENT CONCRETE PROPERTIES

Cosmin Ion ANECHITEI, Constantin Dorinel VOINITCHI, Alina Ioana BADANOIU, Roxana TRUSCA

This paper investigates the influence of four different treatment methods applied to recycled concrete aggregates (RCA), each aimed at reducing open porosity and improving their physical properties. In the first two treatments, RCA were immersed for 28 days in waste concrete slurry (a byproduct generated in concrete ba…

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15

OPTIMIZATION AND CHARACTERIZATION OF PLASMA-ACTIVATED WATER FOR BIOMEDICAL DECONTAMINATION APPLICATIONS

Eliza-Maria BALUS, Ioana TOFAN, Daniela IONIȚĂ, Nicolae GRIGORE, Camelia UNGUREANU

Plasma Activated Water (PAW) is increasingly investigated as an environmentally friendly alternative to conventional chemical disinfectants for biomedical applications. In the present study, a laboratory-scale atmospheric-pressure corona discharge reactor was optimized in order to improve plasma-liquid interaction and …

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16

POLYSULFONE-SWCNT COMPOSITE MEMBRANES FOR IRON REMOVAL FROM WATER

Eduard-Ionut PISCANU, Celina-Maria DAMIAN, Andreea Madalina PANDELE, Ruxandra Mihaela OPREA, Madalina OPREA, Stefan Ioan VOICU

The present study focuses on the evaluation of the ability to retain iron ions from aqueous solution of composite membranes based on polysulfone (PSf) and single-walled carbon nanotube (SWCNT). Different concentrations were employed, and their influence on the structural, thermal, morphological, and filtration features…

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17

ASSESSMENT OF PM10 AND PM2.5 AIR POLLUTION IN TÂRGOVIȘTE MUNICIPALITY, ROMANIA

Florina-Roxana DUMITRU, Lucica BARBEȘ, Alina BĂRBULESCU

Urban air quality is influenced by multiple emission sources and local meteorological conditions, and characterizing the spatial and temporal variations of suspended particles is important for assessing the urban environment in Romania. This study investigates the distribution of PM10 and PM2.5 concentrations in a medi…

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18

ISOCYANATE-FUNCTIONALIZED CHITOSAN AS A BIO-BASED REINFORCEMENT FOR POLYUREA COMPOSITES

Kadir DUMAN, Madalina Ioana NECOLAU, Celina Maria DAMIAN, Anamaria ZAHARIA, Horia IOVU

In this paper, modified polyurea was obtained and characterized. Only the prepolymer part of polyurea was modified using chitosan as a bio-derived reinforcing agent. The amine part remained unchanged. The prepolymer part was modified through direct physical blending and chemical grafting of chitosan to isocyanate. The …

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19

TESTING AND CHARACTERIZATION OF ANTIMICROBIAL COPPER COATINGS DEPOSITED ON STEEL SUBSTRATES

Iulian SPÂNU, Iulian ANTONIAC, Tudor Viorel TIGANESCU, Robert CIOCOIU, Daniela Alina NECȘULESCU, Sorin CIUCA, Ruxandra Elena DUMITRESCU, Ioana Dana CARSTOC

The high incidence of nosocomial infections in medical units requires the adoption of advanced measures to control and limit their spread. In this context, the study and optimization of intrinsically bactericidal coatings, such as copper, is a highly topical research direction. In this work, copper deposits on three di…

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20

OPTIMAL GEOMETRIC PARAMETERS AND ENHANCED CUTTING PERFORMANCE OF TI(C,N)-BASED CERMET TOOLS

Guangchen XU, Wenwu ZHANG

Ti(C,N)-based cermet tools offer high hardness and wear resistance, yet the role of tool geometry is underexplored. Using Deform-3D simulation and response surface methodology, quadratic models for cutting force (F) and tool-tip temperature (T) were established (R²>0.98, p<0.0001). Edge radius dominates F (52.1%) and T…

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21

OCCURRENCE AND COMPOSITION OF POLYMERIC MATERIALS IN BEACH MACROLITTER ALONG THE ROMANIAN BLACK SEA COAST

Andreea-Mădălina CIUCĂ, Elena STOICA, Ileana-Cristina COVALIU-MIERLĂ, Lucica BARBEȘ

The rapid growth of plastic manufacturing and consumption poses a significant threat to the marine environment, negatively affecting biodiversity, ecosystem functions, and human health through litter accumulation. This study presents an innovative approach for the region by comparing classical visual assessments of mar…

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22

FAILURE ANALYSIS AND CORROSION MECHANISM INVESTIGATION OF HEAT EXCHANGER PLATES FROM AN OIL REFINERY

Andrei GRECU, Claudia Ionela TARCEA, George COMAN, Andrei BERBECARU, Mirela SOHACIU, Ecaterina MATEI, Andra PREDESCU, Mihaela Rodica DOBRE, Karina STANICESCU SOLOMON, Sorin CIUCA, Cristian PREDESCU

This paper presents research conducted on four plates from a heat exchanger located in an oil refinery, aiming to identify the causes leading to their severe corrosion. The chemical composition, macro- and microstructural analysis, and hardness characteristics of the material were analyzed. Results obtained were compar…

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23

CORROSION-INDUCED DEGRADATION OF BURIED FOUNDATIONS IN ROMANIAN 400 kV GUYED TOWERS

Ciprian PREDA, Mihai MOCANU

Buried foundations have a critical role in maintaining the structural integrity of high-voltage overhead transmission lines. In the case of 400 kV guyed towers operating in Romania, long-term exposure to aggressive soil environments could lead to progressive degradation mechanisms that are often difficult to detect dur…

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24

PECULIARITIES OF THE TITANIUM AND NICKEL ALUMINIDES AUTO-SYNTHESIS

Mihai Ovidiu COJOCARU, Mihai BRÂNZEI, Adrian BIBIȘ, Sorin CIUCĂ, Cristian BORZ, Ruxandra Elena DUMITRESCU

Due to their unique intrinsic properties, intermetallic compounds such as titanium and nickel aluminides are of particular interest for high-end sectors, most notably the aerospace industry, which serves as the primary consumer of these materials. This paper presents a thermodynamic analysis of the main reactions invol…

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25

PROCESS-MICROSTRUCTURE-PROPERTY RELATIONSHIPS IN SELECTIVE LASER MELTING FABRICATED Ti-6Al-4V DENTAL IMPLANTS

Zhiyuan WAN, Liwei CHEN

In this study, Ti-6Al-4V titanium alloys for dental implants were prepared by selective laser melting (SLM) technology, and the influence of key parameters such as laser power, scanning speed, and powder thickness on the molding quality was investigated. The performance of the specimens was comprehensively evaluated th…

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