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4. Study on the Possibilities of Developing Cementitious or Geopolymer Composite Materials with Specific Performances by Exploiting the Photocatalytic Properties of TiO2 Nanoparticles

Author

Hegyi, Andreea, primary, Lăzărescu, Adrian-Victor, additional, Ciobanu, Adrian Alexandru, additional, Ionescu, Brăduţ Alexandru, additional, Grebenişan, Elvira, additional, Chira, Mihail, additional, Florean, Carmen, additional, Vermeşan, Horaţiu, additional, and Stoian, Vlad, additional

Published
2023
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11. Study on the Possibilities of Developing Cementitious or Geopolymer Composite Materials with Specific Performances by Exploiting the Photocatalytic Properties of TiO 2 Nanoparticles.

Author

Hegyi, Andreea, Lăzărescu, Adrian-Victor, Ciobanu, Adrian Alexandru, Ionescu, Brăduţ Alexandru, Grebenişan, Elvira, Chira, Mihail, Florean, Carmen, Vermeşan, Horaţiu, and Stoian, Vlad

Subjects
CEMENT composites, COMPOSITE materials, SELF-healing materials, TITANIUM dioxide, CIRCULAR economy, CONSTRUCTION materials
Abstract

Starting from the context of the principles of Sustainable Development and Circular Economy concepts, the paper presents a synthesis of research in the field of the development of materials of interest, such as cementitious composites or alkali-activated geopolymers. Based on the reviewed literature, the influence of compositional or technological factors on the physical-mechanical performance, self-healing capacity and biocidal capacity obtained was analyzed. The inclusion of TiO2 nanoparticles in the matrix increase the performances of cementitious composites, producing a self-cleaning capacity and an anti-microbial biocidal mechanism. As an alternative, the self-cleaning capacity can be achieved through geopolymerization, which provides a similar biocidal mechanism. The results of the research carried out indicate the real and growing interest for the development of these materials but also the existence of some elements still controversial or insufficiently analyzed, therefore concluding the need for further research in these areas. The scientific contribution of this study consists of bringing together two apparently distinct research directions in order to identify convergent points, to create a favorable framework for the development of an area of research little addressed so far, namely, the development of innovative building materials by combining improved performance with the possibility of reducing environmental impact, awareness and implementation of the concept of a Circular Economy. [ABSTRACT FROM AUTHOR]

Published
2023
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25. Agrometeorological Requirements of Maize Crop Phenology for Sustainable Cropping—A Historical Review for Romania

Author

Vâtcă, Sorin Daniel, primary, Stoian, Valentina Ancuța, additional, Man, Titus Cristian, additional, Horvath, Csaba, additional, Vidican, Roxana, additional, Gâdea, Ștefania, additional, Vâtcă, Anamaria, additional, Rotaru, Ancuța, additional, Vârban, Rodica, additional, Cristina, Moldovan, additional, and Stoian, Vlad, additional

Published
2021
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27. Optimization of Hermetia illucens (L.) egg laying under different nutrition and light conditions

Author

Macavei, Laura I., Benassi, Giacomo, Stoian, Vlad, and Maistrello, Lara

Subjects
Life Cycles, Light, Physiology, Science, Oviposition, Longevity, Breeding, Larvae, Reproductive Physiology, Pregnancy, Medicine and Health Sciences, Animals, Black soldier fly, oviposition, nutrition, diet, larvae, artificial light, sunlight, light, light emitting diodes, Simuliidae, Nutrition, Physics, Electromagnetic Radiation, Light Emitting Diodes, fungi, Parturition, Biology and Life Sciences, Diodes, Diet, Artificial Light, Larva, Physical Sciences, Sunlight, Medicine, Engineering and Technology, Solar Radiation, Female, Electronics, Research Article, Developmental Biology
Abstract

The black soldier fly Hermetia illucens is gaining growing interest as a tool for the valorisation of bio-waste in a circular economy perspective. Although a wide variety of studies are available for larvae rearing, the indoor breeding of adults still presents a great challenge for industrial purposes. This study was designed to assess the simultaneous influence of 3 different light sources (the Mix of LED UV:blue:green 1:1:3, White LED, Neon light) and 3 types of nutrition (sugar and water, only water, no sugar no water) on adult performances, obtaining different egg production parameters that included the number and weight of the egg masses and single eggs laid by the females, the duration of pre-oviposition and oviposition period, the adult life span, the hatchability of the eggs. Our results showed that production parameters are influenced mainly by nutrition rather than light factor, although light plays an important secondary role. Moreover, the presence of sugar positively affects the egg production (12,93-27,10 mg eggs/female) and increases oviposition period (18,2-31,8 days) and adult lifespan (20,79-27,11 days). Light sources also affect egg production parameters, with the exposure to the Mix of LEDs resulting in the best performance of flies. Results obtained from this study are very useful for the design and management of an efficient industrial black soldier fly mass rearing process.

Published
2020

31. Mycorrhizal Role in Phosphorus Metabolism.

Author

POP MOLDOVAN, Victoria, VIDICAN, Roxana, CORCOZ, Larisa, and STOIAN, Vlad

Subjects
PHOSPHORUS metabolism, HOST plants, PLANT competition, PLANT roots, SOIL fungi, DROUGHT tolerance, VESICULAR-arbuscular mycorrhizas, MYCORRHIZAL fungi
Abstract

The roots of the plants are in contact with a substrate, and biotic and abiotic factors influence their functioning and development. The most known microorganisms associated with plant roots are soil fungi, which are adapted to the soil's living environment, called mycorrhizae. Arbuscular mycorrhizae are the most common of these associations. In agricultural ecosystems, the constant use of technologies has resulted in a progressive reduction of mycorrhizal diversity. Due to this phenomenon, soil presents a lower potential for the development of multilevel hyphal networks which implies reduced connections between all individuals of a single species. Mycorrhizas offer benefits for the host plant, including mineral nutrition, increased drought tolerance, and protection against pathogens. They play a significant role in acquiring the necessary nutrients (especially phosphorus and nitrogen) from soil to their host plants, as these nutrients may have low mobility in most soils. Plants take up phosphorus from soil indirectly through the hyphal network that can reach outside from the root depletion area. Mycorrhizal association increases the accumulation of nitrogen in the plant as a result of the competition of hyphae for the organic mineralized form of this element. [ABSTRACT FROM AUTHOR]

Published
2022
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44. Arbuscular Mycorrhizae Morphotype-Based Identification Using Optical Microscopy.

Author

CRIŞAN, Ioana, VIDICAN, Roxana, and STOIAN, Vlad

Subjects
VESICULAR-arbuscular mycorrhizas, MICROSCOPY, SCARS, SPORES, IDENTIFICATION
Abstract

Structures of different AM taxa found in symbiosis with plants can stain from intense to weak after roots preparation for microscopy. Although arbuscules are distinctive features of AM, their overall shape can vary in association with two proliferation types: Arum and Paris. Auxiliary cells and vesicles are not omnipresent. Intraradical hyphae can present divergent types: straight/coiled, with "Y"/"H" connections. According to spore formation, there are five main AM morphotypes. Spore-based species identification takes into account: color, shape, size of spores and sporocarps as well as structures associated with them (cicatrix, pedicel, peridium, sporiferous saccule, sporogenous cell, subtending hypha). Description of subcellular structures of spores targets phenotypic and biochemical properties of layers using Melzer's reagent and morphology of pre-germination structures when present. [ABSTRACT FROM AUTHOR]

Published
2019
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