2. Articole

Permanent URI for this collectionhttps://msuir.usm.md/handle/123456789/47

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Author: search.filters.author.Chirița, ArcadiiHas files: Yes

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    Method and setup to increase power density threshold for image distinguishing by CCD camera [Articol]
    (2020) Chirița, Arcadii
    Image recording of photosensitive objects, such as biological objects, whose biological and chemical activity can change as a function of light level, can be obtained at power densities from the object less than the minimal power density that can be registered by digital camera used. The rasterized images, at power densities from the object practically nine times less than the power density threshold for the digital camera used, were recorded and distinguished.
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    Reflectance spectra of plant leaves obtained by remote sensing [Articol]
    (2020) Chirița, Arcadii
    The paper presents the results of studies on the detection of plants infected by parasites, from a remote distance, basing on the spectral reflectance. The possibility to detect infection by parasites of nut leaves (small areas 1-2 mm) from remote distance was shown.
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    Luminescence of β-Ga2O3 Nanoforms Obtained by Oxidation of GaSe Doped with Eu [Articol]
    (Springer, Cham, 2020) Sprincean, Veaceslav; Untila, D.; Chirița, Arcadii; Evtodiev, I.; Caraman, I.
    The GaSe single crystals were doped with Eu in the process of their synthesis and growth. The oxide of β-Ga2O3 doped with Eu in the form of massive nanowires was obtained by thermal treatment (TT) in the atmosphere of GaSe single crystals doped with 1.0 and 3.0 at.% of Eu. The crystalline structure, surface morphology and photoluminescence spectra of GaSe:Eu and β-Ga2O3:Eu single crystals were studied. The Photoluminescence (FL) spectrum of GaSe doped with 1.0 at.% of Eu at room temperature is formed as a result of transitions of 5D0 →7F1 to Eu3+ ion and as a result of radiation annihilation of n = 1 excitons in GaSe. The FL spectra of Ga2O3:Eu was interpreted on the basis of the energy level diagram of electrons in Eu3+ ion.
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    Semiconductori calcogenici sticloși pe bază de As-Se-S dopați cu staniu pentru înregistrarea informației optice [Articol]
    (CEP USM, 2020) Prilepov, Vladimir; Nasedchina, Nadejda; Spoială, Dorin; Matei, Leonid; Chirița, Arcadii
    Au fost cercetate proprietăţile optice şi fotoelectrice ale straturilor subţiri pe bază de semiconductori calcogenici sticloşidin sistemul arsen -seleniu-sulf dopate cu staniu.
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    Determinarea stadiului de vegetație, a calității și tipului solului prin măsurări ale spectrelor optice [Articol]
    (CEP USM, 2020) Spincean, Veaceslav; Caraman, Mihail; Chirița, Arcadii; Paladi, Florentin
    Sunt cercetate spectrele de reflexie difuză și de fotoluminescență pentru probe de sol și de frunze colectate la diferite stadii de dezvoltare. Stadiul de vegetație a frunzelor și tipul lor poate fi determinat atât după marginea benzii de reflexie difuză în intervalul 460÷520 nm, cât și după valoarea numerică a coeficientului de reflexie difuză în regiunea pantei dependenței Rd(λ).Este determinat intervalul spectral în care se poate stabili calitatea și tipul solului după mărimea coeficientului de reflexie difuză.
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    Technology of vanadium and its oxides based nanocomposite structures [Articol]
    (INOE Publishing House, 2014) Prilepov, V.; Gasin, Petru; Chirița, Arcadii; Midoni, V.; Spoiala, Dorin; Ketrush, Petru
    The peculiarities of vanadium and its oxides based nanocomposite structures fabrication are brought in this paper. The selected fabrication technological conditions allow creating a V2O5 based dielectric matrix in which conducting clusters are uniformly distributed. Some optical and electrical properties of such structures are presented. It was shown that the obtained layers possess high charge sensitivity.
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    Red blood cells interaction with vanadium and its oxides based nanocomposite structures [Articol]
    (INOE Publishing House, 2014) Prilepov, V.; Gasin, P.; Prilepov, I.; Midoni, V.; Chirița, Arcadii; Spoiala, Dorin; Ketrush, P.
    The results of the investigation of vanadium and its oxides based nanocomposite structures interaction with the water are brought in this paper. It was established, that at the non-contact interaction of the nanocomposite structures with the water, its activation occurs, which is revealed in a change in the sign of the redox potential of the water from the initial positive to the negative one. Besides, the activation effect is interconnected, i.e. the activation both of the water as well as of nanocomposite structures occurs. The observed effect is explained in the frame of the resonance interaction of the oscillating dipoles theory (the conductive clusters uniformly distributed in V2O5 dielectric matrix with the water molecule dipoles. On the basis of the experimental results, one can affirm that the vanadium and its oxides based nanocomposite structures are a biologic activators and can be used in a modern biomedicine