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Simion Breaz,Andrada Cimpean 대한수학회 2018 대한수학회보 Vol.55 No.4
We study the class of rings $R$ with the property that for $x\in R$ at least one of the elements $x$ and $1+x$ are tripotent. We prove that a commutative ring has this property if and only if it is a subring of a direct product $R_0\times R_1\times R_2$ such that $R_0/J(R_0)\cong \Z_2$, for every $x\in J(R_0)$ we have $x^2=2x$, $R_1$ is a Boolean ring, and $R_3$ is a subring of a direct product of copies of $\Z_3$.
Breaz, Simion,Cimpean, Andrada Korean Mathematical Society 2018 대한수학회보 Vol.55 No.4
We study the class of rings R with the property that for $x{\in}R$ at least one of the elements x and 1 + x are tripotent. We prove that a commutative ring has this property if and only if it is a subring of a direct product $R_0{\times}R_1{\times}R_2$ such that $R_0/J(R_0){\cong}{\mathbb{z}}_2$, for every $x{\in}J(R_0)$ we have $x^2=2x$, $R_1$ is a Boolean ring, and $R_3$ is a subring of a direct product of copies of ${\mathbb{z}}_3$.
Mallampati, Srinivasa Reddy,Mitoma, Yoshiharu,Okuda, Tetsuji,Simion, Cristian,Lee, Byeong Kyu Elsevier 2015 JOURNAL OF ENVIRONMENTAL RADIOACTIVITY Vol.139 No.-
<P><B>Abstract</B></P> <P>Although direct radiation induced health impacts were considered benign, soil contamination with <SUP>137</SUP>Cs, due to its long-term radiological impact (30 years half-life) and its high biological availability is of a major concern in Japan in the aftermath of the Fukushima nuclear power plant disaster. Therefore <SUP>137</SUP>Cs reduction and immobilization in contaminated soil are recognized as important problems to be solved using suitable and effective technologies. One such thermal treatment/vitrification with nanometallic Ca/CaO amendments is a promising treatment for the ultimate immobilization of simulated radionuclide <SUP>133</SUP>Cs in soil, showing low leachability and zero evaporation. Immobilization efficiencies were 88%, 95% and 96% when the <SUP>133</SUP>Cs soil was treated at 1200 °C with activated carbon, fly ash and nanometallic Ca/CaO additives. In addition, the combination of nanometallic Ca/CaO and fly ash (1:1) enhanced the immobilization efficiency to 99%, while no evaporation of <SUP>133</SUP>Cs was observed. At lower temperatures (800 °C) the leachable fraction of Cs was only 6% (94% immobilization). Through the SEM–EDS analysis, decrease in the amount of Cs mass percent detectable on soil particle surface was observed after soil vitrified with <I>n</I>Ca/CaO + FA. The <SUP>133</SUP>Cs soil was subjected to vitrified with <I>n</I>Ca/CaO + FA peaks related to Ca, crystalline phases (CaCO<SUB>3</SUB>/Ca(OH)<SUB>2</SUB>), wollastonite, pollucite and hematite appeared in addition to quartz, kaolinite and bentonite, which probably indicates that the main fraction of enclosed/bound materials includes Ca-associated complexes. Thus, the thermal treatment with the addition of nanometallic Ca/CaO and fly ash may be considered potentially applicable for the remediation of radioactive Cs contaminated soil at zero evaporation, relatively at low temperature.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Vitrification with nanometallic Ca/CaO is a promising treatment for Cs in soil. </LI> <LI> Dynamic Cs immobilization and zero evaporation were done by nanometallic Ca/CaO. </LI> <LI> By SEM analysis the amount of cesium detectable on soil particle surface decreases. </LI> <LI> Leachable cesium concentrations reduced, lower than the standard regulatory limit. </LI> <LI> Nanometallic Ca/CaO is unique amendment for the remediation of Cs in soil. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>SEM–EDS element maps of <SUP>133</SUP>Cs contaminated soil before and after thermal treatment at 1200 °C with different addictives. Color intensity for Cs is from 0 to 100 (low to high).</P> <P>[DISPLAY OMISSION]</P>
Removal of Astrazone Blue from aqueous solutions onto brown peat. Equilibrium and kinetics studies
Lacramioara Rusu,Maria Harja,Andrei Ionu Simion,Daniela Suteu,Gabriela Ciobanu,Lidia Favier 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.6
The aim of this study is to characterize and assess the sorption potential of brown peat, in relation to coloredpollutants from the textile industry wastewater. The objectives of this paper were: the physicochemical, morphological,and mineralogical characterization of brown peat, testing the adsorption capacity of natural and chemically treatedpeat samples for Astrazone Blue, evaluation of adsorption process from equilibrium isotherm and kinetic point of view. The characteristics of the peat samples were investigated using elemental analysis, scanning electron microscopy andX-ray diffractometry. Experimental data indicated that the brown peat tested confirm a high level of adsorption (removalefficiency >93.00%, adsorption capacity reaching up to 24.27 mg/g) of Astrazone Blue from aqueous solution. TheLangmuir and Freundlich adsorption isotherm models were used to find the best equation able to describe the adsorptionprocess. Experimental adsorption data were successfully described by the Langmuir equilibrium isotherm model. This fact is supported by the agreement between the q values obtained using the Langmuir equation (26.32 mg/g), andthe ones obtained experimentally (24.27 mg/g). The kinetic studies showed that the pseudo-second-order model describedAstrazone Blue sorption kinetics, as confirmed by the high values of R2, which are over 0.99 for the wholeinvestigated concentration range (200 to 800 mg/L). The use of brown peat adsorbent is more advantageous comparedwith other materials since it does not require a preliminary treatment, is low-cost and is an eco-friendly adsorbent. Hence,this peat appears to be a viable material for the decontamination of effluents containing dyes.
Mallampati, S. R.,Lee, B. H.,Mitoma, Y.,Simion, C. Springer Science + Business Media 2016 Environmental Science and Pollution Research Vol.23 No.22
<P>Simultaneous immobilization of heavy metals and decomposition of halogenated organic compounds in different fractions of automobile shredder residue (ASR) were achieved with a nano-sized metallic calcium through a 60-min ball milling treatment. Heavy metal (HM) immobilization and chlorinated/brominated compound (CBC) decomposition efficiencies both reached 90-100 %, after ball milling with nanometallic calcium/calcium oxide (Ca/CaO) dispersion, regardless of ASR particle size (1.0, 0.45-1.0, and 0.250 mm). Concentrations of leachable HMs substantially decreased to a level lower than the regulatory standard limits (Co and Cd 0.3 mg L-1; Cr 1.5 mg L-1; Fe, Pb, and Zn 3.0 mg L-1; Mn and Ni 1 mg L-1) proposed by the Korean hazardous waste elution standard regulatory threshold. Scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS) element maps/spectra showed that while the amounts of HMs and CBCs detectable in ASR significantly decreased, the calcium mass percentage increased. X-ray powder diffraction (XRD) patterns indicate that the main fraction of enclosed/bound materials on ASR includes Ca-associated crystalline complexes that remarkably inhibit HM desorption and simultaneously transform dangerous CBCs into harmless compounds. The use of a nanometallic Ca/CaO mixture in a mechanochemical process to treat hazardous ASR (dry conditions) is an innovative approach to remediate cross-contaminated residues with heavy metals and halogenated compounds.</P>
Mallampati, S. R.,Lee, B. H.,Mitoma, Y.,Simion, C. Springer 2017 Environmental Science and Pollution Research Vol. No.
<P>One method of weakening the inherently hydrophobic surface of plastics relevant to flotation separation is heterogeneous nano-Fe/Ca/CaO catalytic ozonation. NanoFe/Ca/CaO-catalyzed ozonation for 15 min efficiently decreases the surface hydrophobicity of brominated and chlorinated flame retardant (B/CFR)-containing plastics (such as acrylonitrile-butadienestyrene (ABS), high-impact polystyrene (HIPS), and polyvinyl chloride (PVC)) in automobile shredder residue (ASR) to such an extent that their flotation ability is entirely depressed. Such a hydrophilization treatment also stimulates the ABS, HIPS, and PVC surface roughness, wetting of the surface, and the thermodynamic equilibrium conditions at the surface and ultimately changes surface polarity. SEM-EDS, AFM, and XPS analyses of the PVC and ABS surfaces demonstrated a marked decrease in [Cl/Br] and a significant increase in the number of hydrophilic groups, such as C-O, C=O, and (C= O)-O. Under froth flotation conditions at 50 rpm, about 99.5% of ABS and 99.5% of HIPS in ASR samples settled out, resulting in a purity of 98 and 98.5 % for ABS and HIPS in ASR samples, respectively. Furthermore, at 150 rpm, we also obtained 100 % PVC separation in the settled fraction, with 98 % purity in ASR. Total recovery of non-B/CFR-containing plastics reached nearly 100 % in the floating fraction. The amount of nano-Fe/Ca/ CaO reagent employed during ozonation is very small, and additional removal of surface contaminants from the recycled ASR plastic surfaces by ozonation makes the developed process simpler, greener, and more effective.</P>
Takanen, Silvia,Bangrazi, Caterina,Graziano, Vanessa,Parisi, Alessandro,Resuli, Blerina,Simione, Luca,Caiazzo, Rossella,Raffetto, Nicola,Tombolini, Vincenzo Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.18
Currently the most important prognostic factor in lung cancer is the stage. In the current lung TNM classification system, N category is defined exclusively by anatomic nodal location though, in other type of tumours, number of lymph nodes is confirmed to be a fundamental prognostic factor. Therefore we evaluated the number of mediastinal lymph nodes as a prognostic factor in locally advanced NSCLC after multimodality treatment, observing a significant effect of the number of lymph nodes in terms of OS (p<0.01) and DFS (p<0.001): patients with a low number of positive mediastinal nodes have a better prognosis.
Yan Bao,Lu Gao,Caiping Feng,Jianzhong Ma,Wenbo Zhang,Chao Liu,Demetra Simion 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
In this study,flower-like ZnO assembled by hollow cones (F-ZnO-HCs) were synthesized viasonochemical route and the related morphology and structure of product were characterized. Then,F-ZnO-HCs nanostructures were employed to polyacrylate and the effect of F-ZnO-HCs on the propertiesof waterbornefilms was investigated. Meanwhile, the morphological evolution of F-ZnO-HCs wasproposed and the superiority of F-ZnO-HCs on synchronously improving the water resistance and watervapor permeability of polyacrylatefilm was discussed. The results showed that F-ZnO-HCs possessed anaverage diameter of800 nm and a large specific surface area of 16.01 m2 g 1. Adjusting the watercontent and citric acid dosage, the morphology of ZnO transformed from F-ZnO-HCs to ZnOnanoparticles, F-ZnO-NSs, F-ZnO-SCs and F-ZnO-NRs. F-ZnO-HCs nanostructures asfillers not onlysignificantly enhance the stability of polyacrylate latex but also simultaneously improve the water vaporpermeability and water resistance of polyacrylatefilm. Moreover, compared with other morphologicalZnO, F-ZnO-HCs was the best for simultaneously improving the water resistance and water vaporpermeability of polyacrylatefilm. F-ZnO-HCs is an ideal candidate for resolving the contradiction of thewater resistance and water vapor permeability of waterbornefilms.