Scientific Bulletin of the Uzhhorod University. Series «Chemistry»最新文献

{"title":"STUDY OF ELECTRONIC STRUCTURE OF Ag2Se, Sb2Se3, AgSbP2Se6","authors":"V.I. Sabov, A. Pogodin, M. Sabov, I. Barchii, Y. Studenyak, G.Yu. Havryltso, A.A. Stercho","doi":"10.24144/2414-0260.2024.1.5-18","DOIUrl":"https://doi.org/10.24144/2414-0260.2024.1.5-18","url":null,"abstract":"The crystal structure of the AgSbP2Se6 compound was studied by X-ray powder method. Crystal chemical structural calculations using the EXPO–CCP14 software complex showed that the AgSbP2Se6 compound crystallizes in trigonal syngoni, SG R-3, unit cell parameters a = 6.61573 Å, c = 39.86223 Å, V=1510.94 Å3, Z=6.\u0000A crystal-chemical analysis of the structures of complex selenides Ag2Se, Sb2Se3, AgSbP2Se6 was carried out. Ag2Se compound (low-temperature modification) crystallizes in orthorhombic syngonia (P212121). Ag+ cations are bound in a 3-coordinate geometry with three equivalent Se2– atoms. Se2– anions coordinate six Ag+ around themselves. Sb2Se3 crystallizes in orthorhombic syngonia (Pnma) with a weakly expressed layered 2D-structure. Sb3+ cations are in two non-equivalent positions: in the first they form deformed [SbSe6] octahedra, in the second [SbSe5] square pyramids. The crystal structure of the compound AgSbP2Se6 (R-3) is characterized by the formation of layers from the anionic group of atoms [P2Se6]4–. In the space between the anionic groups, cations Ag+, Sb3+, which are in octahedral coordination with Se2–, are placed alternately. Sb3+ cations are located on the same plane as the P–P bond centers of [P2Se6]4– anionic groups, Ag+ cations are slightly displaced relative to this plane.\u0000The study of the optical absorption spectra of AgSbP2Se6 single crystal showed that it is characterized by a direct-band allowed type of conductivity, the band gap is Eg=1.49 eV (Tautz method based on (αhν)2=f(hν) Eg=1.48 eV). Ab initio quantum-chemical calculations of the electronic structure using the Quantum Espresso (QE) software package based on density functional theory (DFT) showed that the complex selenides Ag2Se, Sb2Se3, AgSbP2Se6 are characterized by a direct band type of conductivity, the width of the optical band gap Eg = 0.05 eV (Ag2Se ), Eg = 0.87 eV (Sb2Se3), Eg = 1.42 eV (AgSbP2Se6), Fermi energy EFermi=9.75 eV (Ag2Se), EFermi=6.12 eV (Sb2Se3), EFermi=5.34 eV (AgSbP2Se6). The optical band gap (Eg) of Sb2Se3, AgSbP2Se6 compounds are formed by electron transitions Se 4p → Sb 5p, for the Ag2Se compound Se 4p → Ag 5s.","PeriodicalId":437217,"journal":{"name":"Scientific Bulletin of the Uzhhorod University. Series «Chemistry»","volume":"52 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141654698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PHASE EQUILIBRIA IN THE Ag7PS6 – Ag8SiS6 SYSTEM","authors":"A. Pogodin, M. Filep, Y. Zhukova, T. Malakhovska, I.V. Rosokha, O. Kokhan","doi":"10.24144/2414-0260.2024.1.19-23","DOIUrl":"https://doi.org/10.24144/2414-0260.2024.1.19-23","url":null,"abstract":"Ternary silver (I) chalcogenides with an argyrodite structure are of considerable scientific and practical interest as promising thermoelectric, optical, and superionic materials. The functional parameters of these phases are determined by the motif of the crystal structure: tetrahedral close packing and a large number of voids that can be occupied by mobile cations. The result is a significant electrical conductivity and low phonon thermal conductivity. However, the constant growth of requirements for the parameters of functional materials leads to their continuous improvement by increasing their component composition. The alloys of the Ag7PS6 - Ag8SiS6 system were obtained by melting ternary sulfides in vacuumed quartz ampoules in appropriate stoichiometric ratios. The maximum synthesis temperature was 1015°C. All the obtained polycrystalline alloys of the Ag7PS6 - Ag8SiS6 system were studied by DTA and XRD methods. Based on the results of the study of the alloys of the Ag7PS6 - Ag8SiS6 system, a corresponding phase diagram was built and it was found that the Ag7PS6 - Ag8SiS6 system is quasi-binary. It was found that high-temperature modifications of Ag7PS6 and Ag8SiS6 compounds crystallizing in the face-centered cubic SG F-43m form a continuous series of solid solutions. At a lower temperature, the region of the solid solutions region narrows. The areas of two-phase equilibrium between the high and low temperature modifications are realized separately and independently for each of the initial components. At the annealing temperature, the region of boundary solid solutions based on HT-Ag7PS6 does not exceed 25 mol%, and HT-Ag8SiS6 45 mol%.","PeriodicalId":437217,"journal":{"name":"Scientific Bulletin of the Uzhhorod University. Series «Chemistry»","volume":"1 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141652296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TEMPERAMENTAL BEHAVIOUR OF THE OPTICAL ABSORPTION EDGE Of Ag8GeS6 SINGLE CRYSTAL","authors":"T. Malakhovska, A. Pogodin, M. Filep, M. Pop, I. Shender, M.A. Zapototskyi, O. Kokhan","doi":"10.24144/2414-0260.2024.1.28-33","DOIUrl":"https://doi.org/10.24144/2414-0260.2024.1.28-33","url":null,"abstract":"The optical transmission spectra of single-crystal ternary sulfide Ag8GeS6 were measured in the temperature range 77-300 K on pre-prepared samples (plane-parallel with a polished surface to optical quality). The spectral dependences of lnα at all studied temperatures have an exponential shape near the absorption edge, which indicates that they obey the Urbach's rule. By extrapolating the spectral dependences of lnα, the presence of one point of convergence was established and its coordinates were determined: a0 = 5.25 × 107 cm-1 and E0 = 1.88 eV. The presence of a single point of convergence indicates the absence of phase transitions in the studied temperature range. The steepness parameter σ of the optical absorption edge in the studied temperature range was determined from the exponential sections of the spectral dependences of lnα. As a result, the effect of temperature on the electron-phonon interaction (EPI) is analyzed. The determined values of the optical pseudo-gap of the single crystal of ternary sulfide Ag8GeS6 Eg* = 1.466 eV and the Urbach energy EU = 21.90 meV suggest that the single crystal sample of silver thiogermanate Ag8GeS6 can be used as a promising material for collecting sunlight.","PeriodicalId":437217,"journal":{"name":"Scientific Bulletin of the Uzhhorod University. Series «Chemistry»","volume":"41 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141654064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A SIMPLIFIED SCHEME FOR DEVELOPING THE TOLERANCE FACTORS FOR SOME CRYSTAL STRUCTURES","authors":"V. Sidey","doi":"10.24144/2414-0260.2024.1.24-27","DOIUrl":"https://doi.org/10.24144/2414-0260.2024.1.24-27","url":null,"abstract":"The tolerance factor, developed and proposed by Goldschmidt to estimate the stability limits of the cubic perovskite ABX3 structural type for a given chemical composition, has been widely used in solid state chemistry and physics as well as in the related fields of science. Based on the idealized cubic perovskite structure and the ionic radii of the constituents r(A), r(B), and r(X), Goldschmidt derived the formula for the tolerance factor as the ratio between the sums of the ionic radii of cations and anions, {[r(A) + r(X)] / (√2 × [r(B) + r(X)])}, which is equal to 1 in the ideal perovskite structures. From the obtained value of the tolerance factor, it is possible to make reliable predictions about the possibility of the existence of a cubic perovskite phase of a given chemical composition.\u0000The convenience of using the Goldschmidt tolerance factor in the studies of perovskite structures prompted some researchers to begin searching for similar indicators for representatives of other scientifically and technologically important structural families. However, despite the mathematical correctness of the final formulas of the alternative tolerance factors, the derivation of these formulas in a number of works seems to be unnecessarily complicated.\u0000In the present work, a simplified approach has been proposed for developing the alternative tolerance factors from the geometric characteristics of regular coordination polyhedra – namely, from the relationships between the edges and the circumscribed sphere radii of such polyhedra. The proposed approach can be used to derive the tolerance factors formulas for any crystal structures containing regular or nearly regular coordination polyhedra of different types with the same edge lengths.","PeriodicalId":437217,"journal":{"name":"Scientific Bulletin of the Uzhhorod University. Series «Chemistry»","volume":"62 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141654682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EFFICIENCY OF EDUCATIONAL TECHNOLOGIES FOR TEACHING CHEMISTRY IN THE MODERN UKRAINIAN SCHOOL","authors":"M.V. Slyvka, T.V. Labatii, V.O. Bestritska, N. Korol, M.Yu. Tsan'ko, I. Stercho, S.S. Miliovych, A.O. Kryvov'jaz, M. Onysko","doi":"10.24144/2414-0260.2024.1.64-69","DOIUrl":"https://doi.org/10.24144/2414-0260.2024.1.64-69","url":null,"abstract":"The development and quality of education in the country is an effective indicator of the state of its social development. Secondary education plays a key role in the training of highly qualified professional personnel, therefore, monitoring the effectiveness of teaching natural sciences, in particular chemistry, is extremely relevant and allows for a critical analysis of the quality of secondary school reform, which has been actively implemented in Ukraine in recent years. The work investigated and analyzed the effectiveness of teaching chemistry according to the traditional program of the standard level and according to the alternative scientific and educational program \"Intellect of Ukraine\", which widely implements innovative learning technologies in combination with elements of STEM education. The object of the study was selected 7-9 classes of secondary schools of the Transcarpathian region, which work exclusively according to the traditional program of teaching chemistry, exclusively according to the program of the scientific and educational project \"Intellect of Ukraine\" and secondary schools, which work according to a combined scheme (available classes, which study according to different programs ). Experimental data indicate that according to indicators such as the coefficient of the quality of knowledge and the degree of education of students, the classes that study according to the program of the scientific and educational project \"Intellect of Ukraine\" are 10-15% higher, which indicates a higher efficiency of learning chemistry by students 7- 9 classes.","PeriodicalId":437217,"journal":{"name":"Scientific Bulletin of the Uzhhorod University. Series «Chemistry»","volume":"24 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141653903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ELLIPSOMETRIC STUDIES OF Ag7+x(P1-xGex)S6 SINGLE CRYSTALLINE SOLID SOLUTIONS","authors":"T. Malakhovska, A. Pogodin, M. Filep, M. Pop, I. Shender, H.Yu Havryltso, O. Kokhan, R. Mariychuk","doi":"10.24144/2414-0260.2024.1.54-58","DOIUrl":"https://doi.org/10.24144/2414-0260.2024.1.54-58","url":null,"abstract":"The present work is aimed to the study of the physical characteristics of single crystal samples of Ag7+x(P1-xGex)S6 solid solutions (x = 0, 0.1, 0.25, 0.33, 0.5, 0.75, 1). Single crystals of Ag7+x(P1-xGex)S6 solid solutions were grown by the method of directional crystallization from the melt. Specially prepared samples of the grown single crystals of Ag7+x(P1-xGex)S6 solid solutions were studied by spectral ellipsometry method. The spectral dependences of the refractive index are characterized by nonlinearity with a maximum in the spectral range ~645-820 nm. It has been found that cationic substitution in P5+→Ge4+ solid solutions lead to a monotonic nonlinear increase in the refractive index n from 2.58 (x = 0) to 2.75 (x = 1). The obtained values of the refractive index were used to describe the optical parameters using the Wemple-DiDomenico equation. It was found that parameters of Wemple-DiDomenico model – the energy of a single oscillator, the dispersion energy are characterized by a tendency to monotonous decrease in the process of heterovalent cationic P5+→Ge4+ substitution. The established values of the optical band gap Eg suggest that single crystal samples of Ag7+x(P1-xGex)S6 solid solutions can be used as promising materials for solar energy.","PeriodicalId":437217,"journal":{"name":"Scientific Bulletin of the Uzhhorod University. Series «Chemistry»","volume":"10 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141652595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"OPTICAL PROPERTIES of the TlSbP2Se6 SINGLE CRYSTALL","authors":"V.I. Sabov, I. Barchii, M. Piasecki, M. Filep, A. Pogodin, Y. Studenyak, M. Sabov","doi":"10.24144/2414-0260.2024.1.34-38","DOIUrl":"https://doi.org/10.24144/2414-0260.2024.1.34-38","url":null,"abstract":"The scientific interest in TlSbP2Se6 compound is due to a number of factors. Firstly, this compound is characterized by congruent melting behavior, which allows obtaining high-quality bulk single crystals by the method of directional crystallization using the Bridgman technique. Secondly, it is characterized by an acentric 2 D layered structure. Previous studies of TlSbP2Se6 single crystals were limited to optimizing the conditions for growing single crystals, refinig its crystal structure, determining its qualitative and quantitative composition, determining the optical transparency region, and evaluating its physical characteristics using quantum chemical calculations. The purpose of this study was to compare the calculated values of the band gap of TlSbP2Se6 with those experimentally determined by the results of the optical absorption edge study. We prepared plane-parallel samples of single-crystal TlSbP2Se6 along the cleavage plane. The width of the band gap was determined from the transmission spectra using the Tauc method. It was established that the compound TlSbP2Se6 belongs to direct-band semiconductors with a band gap of 1.81 eV. The values calculated by the Becke-Johnson method using the modified functional with the Hubbard parameter and spin-orbit interaction (TB-mBJ+U+SO) and without (mBJ) were the closest to the experimental band gap.","PeriodicalId":437217,"journal":{"name":"Scientific Bulletin of the Uzhhorod University. Series «Chemistry»","volume":"11 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141654303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CRYSTAL GROWTH OF Ag8SiS6","authors":"A. Pogodin, M. Filep, Y. Zhukova, T. Malakhovska, O. Kokhan","doi":"10.24144/2414-0260.2024.1.39-43","DOIUrl":"https://doi.org/10.24144/2414-0260.2024.1.39-43","url":null,"abstract":"Compounds with high ionic conductivity in the solid state, the so-called superionics, are of considerable interest. This scientific interest is driven by the ever-increasing demand for electrochemical energy storage. Promising superionic compounds include argyrodites, complex chalcogenides formed on the basis of two types of cations. This paper presents the results of studies on the growth of Ag8SiS6 single crystal. The growth of Ag8SiS6 single crystals was carried out in two stages. The first stage involved the synthesis of a polycrystalline Ag8SiS6 alloy by fusing high-purity elemental components in vacuum (0.13 Pa) quartz ampoules. The single-phase nature of the synthesized alloy was confirmed by XRD. The results of thermal analysis confirmed the congruent nature of the melting of Ag8SiS6 (Tmelt = 965°C) and the presence of polymorphism (Tpolim = 240°C). The single crystal of Ag8SiS6 was obtained by directed crystallization from the melt. The growth regime of Ag8SiS6 was developed taking into account the results of thermal analysis. The grown single crystal of Ag8SiS6 is ~30 mm long and 12 mm in diameter. The single crystallinity of the grown sample was determined by XRD. According to the XRD results, it was found that the grown Ag8SiS6 single crystal crystallizes in the low-temperature modification of SPG Pna21 with lattice parameters: a = 15.06 Å, b = 7.44 Å, c = 10.54 Å.","PeriodicalId":437217,"journal":{"name":"Scientific Bulletin of the Uzhhorod University. Series «Chemistry»","volume":"94 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141652956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DETERMINATION OF THE ANTAGONISTIC ACTIVITY OF FLUORINE-CONTAINING 1,2,4-TRIAZOLES","authors":"N. Korol, S. Burmei, O. Holovko-Kamoshenkova, M. Slivka","doi":"10.24144/2414-0260.2024.1.59-63","DOIUrl":"https://doi.org/10.24144/2414-0260.2024.1.59-63","url":null,"abstract":"The article describes the study of the antagonistic activity of new fluorine-containing 1,2,4-triazole-3-thiones on various strains of opportunistic pathogens, including Klebsiella pneumoniae, Serratia ficaria, Pseudomonas aeruginosa, Staphylococcus aureus, and microscopic fungi Candida albicans. The method of co-cultivation with clinical isolates of the mentioned microorganisms was used, and the purity of the cultures was quantitatively analyzed and evaluated using bacterioscopy and microscopy.\u0000The results showed that 4-phenyl-5-trifluoroethyl-1,2,4-triazole-3-thione and 4-phenyl-5-pentafluoroethyl-1,2,4-triazole-3-thione exhibited the highest efficiency in inhibiting the growth of Staphylococcus aureus and Serratia ficaria, respectively. These compounds turned out to be promising antimicrobial agents, indicating their potential application in various scenarios of treatment and prevention of infections. The obtained results provide a basis for further research aimed at improving these compounds, their functionalization, finding optimal structures, demonstrating high antimicrobial and fungicidal activity, as well as their eventual introduction into clinical practice to combat various pathogenic microorganisms and support public health.","PeriodicalId":437217,"journal":{"name":"Scientific Bulletin of the Uzhhorod University. Series «Chemistry»","volume":"42 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141655001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SYNTHESIS OF QUATERNIZED THIAZOLOQUINAZOLINIUM TRIIODIDE AND ITS APPLICATION AS AN ACTIVE SUBSTANCE FOR POTENTIOMETRIC SENSOR","authors":"D. Kut, Ye Mahada, M. Fershal, M. Kut","doi":"10.24144/2414-0260.2024.1.82-95","DOIUrl":"https://doi.org/10.24144/2414-0260.2024.1.82-95","url":null,"abstract":"For the first time, the synthesis, isolation, and identification of angular triiodide, 1,2,4,5-tetrahydro-4-ethyl-1-(iodomethyl)-1-methyl-5-oxothiazolo[3,2-a]quinazolin-10-ium, have been achieved. The formation of the triiodide was confirmed by elemental analysis, and its structure was approved by NMR spectra containing signals from the fused thiazolonine ring. The cyclization process was confirmed by the change in signal multiplicity from singlets (thioether) to doublets (thiazole) and a shift to a weaker field in the spectrum of the methyl group from 1.83 ppm to 2.15 ppm. Optimal reaction conditions for the synthesis of thiazolochinazolinium triiodide were found using a double excess of iodine in chloroform at room temperature for 24 hours, yielding 84%.\u0000The obtained thiazolochinazolinium triiodide product was utilized as an active substance for a PVC plasticized triiodide selective potentiometric sensor. The sensor exhibited a super-Nernstian response of 75 mV/pC with a detection limit of 5 10-6 mol/L I3- and a lifetime exceeding 4 months. The pH working range of the sensor was found to be within pH 2-10, with a response time of 15-30 s. The sensor is selective to anions and exhibits some sensitivity to molecular iodine and iodide. The sensor was used as an indicator electrode for the direct potentiometric titration of ascorbic acid using a solution of KI3 in intensely colored fruit juices and vitamin preparations. The accuracy was confirmed by the added-found  method and HPLC analysis.","PeriodicalId":437217,"journal":{"name":"Scientific Bulletin of the Uzhhorod University. Series «Chemistry»","volume":"17 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141652146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}