Spectrochimica Acta Part B: Atomic Spectroscopy最新文献

{"title":"Method for elemental analysis of iron meteorite by total-reflection X-ray fluorescence (TXRF) spectrometry: novel application to Sikhote-Alin meteorite","authors":"Artem S. Maltsev ,&nbsp;Alena N. Zhilicheva ,&nbsp;Galina V. Pashkova ,&nbsp;Kseniya A. Konovalova","doi":"10.1016/j.sab.2025.107301","DOIUrl":"10.1016/j.sab.2025.107301","url":null,"abstract":"<div><div>Classification of iron meteorites is based on their structure and elemental composition. The chemical composition classification is based, especially on Ni, Ga, Ge, Co, Au and Ir mass fractions and divides iron meteorites into 13 groups. In this work, the potential of elemental analysis of iron meteorites using the TXRF method is explored. In the absence of certified reference materials for iron meteorites, the Sikhote-Alin meteorite was chosen for methodological research due to its high degree of homogeneity in elemental composition. The TXRF method was developed for the determination of Fe, Ni, Ga, and Ge following 6 M nitric acid decomposition and a standardless quantification approach. Liquid-liquid extraction with MIBK was employed to remove Fe from the matrix, and Co and Cu were also determined. The precision did not exceed 4 % for Fe, Ni, Cu, and Ge, 8 % for Co, and 11 % for Ga. The trueness, based on recovery values, was generally in the range of 90–110 % for all elements. The TXRF method enabled detection at the first microgram per gram (μg/g) levels and was considered satisfactory for most types of iron meteorites.</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"233 ","pages":"Article 107301"},"PeriodicalIF":3.8,"publicationDate":"2025-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144828942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Translation-free LIBS imaging based on a dual-axis laser scanning galvanometer system","authors":"Rui Dong ,&nbsp;Wangquan Ye ,&nbsp;Luyu Yang ,&nbsp;Zhenghao Guo ,&nbsp;Ye Tian ,&nbsp;Yuan Lu ,&nbsp;Ronger Zheng","doi":"10.1016/j.sab.2025.107290","DOIUrl":"10.1016/j.sab.2025.107290","url":null,"abstract":"<div><div>Conventional laser-induced breakdown spectroscopy (LIBS) imaging systems typically rely on motorized translation stages to move samples. However, stage-dependent architectures have limitations in non-destructive, large-area imaging, especially when analyzing immobilized specimens under <em>in situ</em> conditions. In this work, we replaced the traditional sample translation method with a beam deflection approach, utilizing a dual-axis laser scanning galvanometer system to adjust the deflection direction of the light beam. A telecentric F-theta field lens was introduced to correct field curvature and geometric distortions, enabling efficient scanning of stationary samples without mechanical translation. We applied the system to measure a pure copper target and a copper–silver composite target, with a scanning area of 32 mm<span><math><mrow><mspace></mspace><mo>×</mo><mspace></mspace></mrow></math></span>32 mm, to evaluate its imaging performance. The plasma images reveal a noticeable center-symmetric pattern influenced by scanning angles. Moreover, spectral peak intensities at different wavelengths show markedly distinct distributions, demonstrating the wavelength-dependent interaction mechanisms. This phenomenon was explained using interference theory, thereby enabling correction of the spatial distribution of spectral intensity. This methodology provides a practical design framework for stationary-sample scanning systems, demonstrating measurable application potential in <em>in situ</em> analytics.</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"233 ","pages":"Article 107290"},"PeriodicalIF":3.8,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144841325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Discrimination of postal stamps via energy-dispersive inelastic X-ray scattering (EDIXS): Differentiating inks beyond elemental composition","authors":"Héctor Jorge Sánchez ,&nbsp;Juan José Leani","doi":"10.1016/j.sab.2025.107289","DOIUrl":"10.1016/j.sab.2025.107289","url":null,"abstract":"<div><div>Authenticating postal stamps is crucial due to both their potential financial and historical value. This study explores the efficacy of Energy-Dispersive Inelastic X-Ray Scattering (EDIXS) spectroscopy for discriminating among different stamps, due to its ability to discern atomic environments and oxidation states. While conventional X-ray fluorescence (XRF), coupled with Principal Component Analysis (PCA), can differentiate stamps, its information primarily reflects ink plus paper composition, which varies over time and isn't ideal for a proper classification.</div><div>This study analyzes the iron Kα-RIXS peak region in nine Argentine stamps spanning nearly a century. PCA is applied to the EDIXS data, revealing distinct regions in 2D and 3D principal component representations, where each region corresponds to a specific elemental composition and atomic environment of the cancellation mark inks. While some regions overlap, several inks are demonstrably differentiated, highlighting the potential of EDIXS for discriminating inks.</div><div>The limitations of the current findings, due to overlapping regions, can be solved with further investigations including increased measurements per point and direct comparisons among stamps. Overall, this study underscores the power of EDIXS in characterizing and distinguishing inks beyond elemental composition, offering a promising potential tool for stamp authentication and combating forgery in philately.</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"233 ","pages":"Article 107289"},"PeriodicalIF":3.8,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144828943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Baseline correction for solution cathode glow discharge (SCGD) atomic emission spectroscopy (AES) using an iterative shift difference algorithm based on fitting-accuracy","authors":"Peichao Zheng ,&nbsp;Junhao Xiang ,&nbsp;Jinmei Wang ,&nbsp;Biao Li ,&nbsp;Guanghui Chen ,&nbsp;Xuanyu Luo ,&nbsp;Biyong Zhang ,&nbsp;Tao Hu","doi":"10.1016/j.sab.2025.107291","DOIUrl":"10.1016/j.sab.2025.107291","url":null,"abstract":"<div><div>Solution cathode glow discharge atomic emission spectroscopy (SCGD-AES) is an excellent analytical technique for detecting trace metal elements, yet its quantitative analysis accuracy is severely affected by spectral interference and continuum background. Here, an algorithm based on iterative shift difference was proposed for simultaneous correction of these interference effects and continuum background. The method applies a wavelength shift to the spectrum, subtracts the shifted spectrum from the original unshifted one to minimize background fluctuations, and subsequently restores the spectral profile using a deconvolution. Additionally, iterative shift step optimization based on calibration curve fitting-accuracy is introduced to accommodate spectral differences across elements. This method was applied for SCGD-AES analyses of Zn, Fe, Mg, Cu and Ca with continuum backgrounds and spectral interference in aqueous solution samples. Experimental results demonstrate that the ISDF algorithm eliminates the need for repeated blank background measurements. It achieves a fitting accuracy (R²) for calibration curves exceeding 0.995 for Zn, Fe, Mg, Cu and Ca and reduces measurement errors to approximately 5 %. These metrics surpass those of matrix-matched calibration, moving-average corner-cutting (MA-CC), and achieves equivalent effect to the subtraction of adjacent spectral background (adjacent-background). The results demonstrated that the developed algorithm contributed to accuracy improvement for SCGD-AES quantitative analyses with the presence of spectral interference.</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"233 ","pages":"Article 107291"},"PeriodicalIF":3.8,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144828941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Up-conversion of 780 nm or 795 nm laser radiation to 420 nm in rubidium atomic vapor","authors":"Armen Sargsyan,&nbsp;Anahit Gogyan,&nbsp;David Sarkisyan","doi":"10.1016/j.sab.2025.107282","DOIUrl":"10.1016/j.sab.2025.107282","url":null,"abstract":"<div><div>We demonstrate efficient laser-induced fluorescence (LIF) at 420 nm — corresponding to the Rb <span><math><mrow><mn>6</mn><msub><mrow><mi>P</mi></mrow><mrow><mn>3</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>→</mo><mn>5</mn><msub><mrow><mi>S</mi></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow></math></span> transition — induced by 780 nm or 795 nm laser radiation, which is nearly resonant via a two-photon excitation pathway involving the <span><math><mrow><mn>5</mn><msub><mrow><mi>S</mi></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>→</mo><mn>5</mn><msub><mrow><mi>D</mi></mrow><mrow><mn>3</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow></math></span> transition. We use a 1-cm-long T-shaped all-sapphire cells containing Rb vapor and different pressures of Ne buffer gas. The dependence of 420 nm LIF intensity on temperature, buffer gas pressure, and excitation wavelength is analyzed. The optimal conditions for achieving bright blue-violet emission are established. Practical applications of this up-conversion process are discussed. The results demonstrate the potential for using Rb vapor cells as compact and efficient optical up-conversion filters, converting near-infrared laser radiation into visible blue emission.</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"233 ","pages":"Article 107282"},"PeriodicalIF":3.8,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144722235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Femtosecond Laser-Induced Ablation – Quadrupole Mass Spectrometry (fs-LIA-QMS) experiment for the detection of trapped hydrogen isotopes and helium in nuclear fusion relevant materials","authors":"Steffen Mittelmann,&nbsp;Matej Mayer,&nbsp;Udo von Toussaint,&nbsp;Benedikt Buchner,&nbsp;Andreas Theodorou,&nbsp;Thomas Dürbeck,&nbsp;Wolfgang Jacob,&nbsp;Thomas Schwarz-Selinger","doi":"10.1016/j.sab.2025.107283","DOIUrl":"10.1016/j.sab.2025.107283","url":null,"abstract":"<div><div>We present a novel instrumentation using ultrashort pulsed laser induced ablation in combination with a Quadrupole Mass Spectrometer (QMS) for the detection of gaseous species retained in tungsten (W) and other metallic substrates. In particular, the potential of this technique for the investigation of hydrogen isotopes retention in plasma-facing components of fusion devices is demonstrated. Our fs-LIA-QMS experiment is capable of detecting deuterium (D) and helium (He) in W samples with high sensitivity down to <span><math><mrow><mn>0</mn><mo>.</mo><mn>005</mn><mspace></mspace><mi>at.%</mi></mrow></math></span>, depth resolution in the order of <span><math><mrow><mn>15</mn><mspace></mspace><mi>nm/pulse</mi></mrow></math></span>, and high lateral resolution better than <span><math><mrow><mn>30</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span>. The study highlights the importance of using sub-picosecond laser pulses for an accurate depth-resolved detection of gaseous species trapped in metallic substrates. The use of ultra-short, near UV laser pulses (<span><math><mrow><mn>400</mn><mspace></mspace><mi>fs</mi><mo>,</mo><mn>343</mn><mspace></mspace><mi>nm</mi></mrow></math></span>) reduces heat affection compared with nanosecond and picosecond ablation processes. Our results are in good agreement with other diagnostics applied in this context, such as 3-He Nuclear Reaction Analysis (NRA) for the D depth profiling, and numerical simulations of the He distribution with SDTrimSP. We also discuss the limitations of the technique, including the influence of heat diffusion initiated by the fs-laser and the characterization of loss-channels in the system that determine the limit of detection.</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"233 ","pages":"Article 107283"},"PeriodicalIF":3.8,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144770895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Measurement of uranium samples for nuclear forensics by laser ablation multi-collector inductively coupled plasma mass spectrometry using a pre-cell mass filter for collision/reaction cell (MC-ICP-MS/MS)","authors":"Zsolt Varga,&nbsp;Maria Wallenius","doi":"10.1016/j.sab.2025.107287","DOIUrl":"10.1016/j.sab.2025.107287","url":null,"abstract":"<div><div>In this paper we present the performance of the newly developed Neoma™ multi-collector inductively coupled plasma mass spectrometry equipped with a pre-cell mass filter for collision/reaction cell (MC-ICP-MS/MS) coupled to laser ablation for nuclear forensics for the first time. The characteristics of the recently introduced MC-ICP-MS/MS instrument are assessed by measuring the U isotopic composition and U isotope ratio spatial distribution. We found that the achieved uranium isotope ratios agree well with the certified values. Furthermore, precisions using the current instrument have considerably improved due to the use of merely Faraday detectors for the analysis, their extended range (up to 100 V) and shorter dwell times (i.e. more data points) besides the multiple collection property of the MC-ICP-MS. The achieved ²³⁵U/²³⁸U relative combined uncertainty of 0.053 % for low-enriched uranium material using laser ablation is more than one order of magnitude better than using a single collector ICP-MS and approximately 5 times better than the previously reported MC-ICP-MS values. This ²³⁵U/²³⁸U amount ratio uncertainty is also much better than the recommended International Target Values for low-enriched uranium, which is generally used in nuclear safeguards. The use of higher mass resolution (<em>R</em> = ∼7100) compared to the standard measurement at <em>R</em> = ∼2100 does not worsen significantly the achieved isotope ratio uncertainty. This feature is particularly important for laser ablation studies of confiscated scrap samples or impure nuclear materials in nuclear forensics, where the matrix constituents can highly affect the obtained results. By the coupling the instrument to laser ablation, the overall analysis can be performed in a quasi-non-destructive way in a very short time (within a few hours) and producing practically no radioactive waste in addition. The developed method was applied for two types of tangible illicit nuclear materials (2 highly enriched U metal samples with ∼90 % ²³⁵U abundance and 3 low-enriched UO₂ samples) for characterization. Due to the improved precision an observable inhomogeneity at micron level was found in UO₂ materials, which can further refine the origin assessment. However, this finding has to be taken into account during the reporting of the U isotope abundances. In conclusion, besides its potential in other scientific disciplines, where high precision isotope analysis is required, the established technique using the novel MC-ICP-MS/MS instrument is essential in the security toolkit in nuclear forensic response without considerable alteration of the legal evidence.</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"233 ","pages":"Article 107287"},"PeriodicalIF":3.8,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144781519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laser-induced breakdown spectroscopy assisted by acoustic levitation (LIBS-AL) for the calibration-free quantification of elements of interest in liquids – Case study of mineral waters","authors":"Jairo C. Peralta ,&nbsp;Sanath Shetty ,&nbsp;Ivan A. Urbina ,&nbsp;Matej Veis ,&nbsp;Victor Contreras ,&nbsp;Pavel Veis","doi":"10.1016/j.sab.2025.107286","DOIUrl":"10.1016/j.sab.2025.107286","url":null,"abstract":"<div><div>Bottled water is an essential commodity in modern life, and monitoring its composition is a critical necessity for public health; a task usually time-consuming with the current analytical techniques, when multi-elemental analysis is required. In this study, Laser-Induced Breakdown Spectroscopy assisted by acoustic levitation (LIBS-AL) was employed for the first time to quantify the elemental composition of complex liquid samples. This technique enables the analysis of liquid samples without interference or contamination from containers or substrates, allowing elemental quantification without any conventional pretreatment. This study was conducted using three bottled mineral water samples manufactured in Slovakia and the Czech Republic. Important minerals such as alkali (Na, K, Li) and alkali earth metals (Ca, Mg) were identified in the LIBS spectra and quantified by using calibration-free (CF-LIBS) approach for the first time in levitated liquid samples. The results demonstrated a good agreement with the reported values, with relative error in the concentrations between 3 and 27 % for the major elements (Na, Ca, Mg), while higher relative errors were noted for trace elements (Li, K). These findings validate the reliability of this methodology for monitoring liquid composition in a fast and environmentally friendly way, avoiding sample preparation steps with additional reagents or chemical waste during spectroscopic analysis.</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"232 ","pages":"Article 107286"},"PeriodicalIF":3.8,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144723576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of portable X-ray fluorescence spectroscopy and thickness monitor to characterize iron and zinc rust layer for on-site analysis","authors":"Housei Akazawa,&nbsp;Takashi Sakamoto","doi":"10.1016/j.sab.2025.107285","DOIUrl":"10.1016/j.sab.2025.107285","url":null,"abstract":"<div><div>We propose a new method for on-site analysis of steel rust and Zn rust by exploiting X-ray fluorescence (XRF) spectroscopy. This method consists of a thin-film mode analysis in which Cl⁻ ions incorporated in rust are used as a marker unaffected by the iron and oxygen content. By simultaneously monitoring the thickness of the rust layer with a portable analyzer at multiple points, a diagram of rust thickness (<em>t</em>) versus Cl content (<em>f</em>_Cl) is obtained to characterize the properties of the rust. The feasibility is demonstrated for severely corroded steel and galvanized steel samples after partial derusting by laser irradiation. The slope of the <em>t- f</em>_Cl plot represents Cl removal efficiency. For very thin residual rust, the relation between Cl content and surface Cl density derived by a resistivity measurement through solving chlorides in pure water indicated that an apparent Cl content of 0.4 % measured by XRF corresponds to a salt density of 50 mg/m².</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"232 ","pages":"Article 107285"},"PeriodicalIF":3.8,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Use of a 10 eV monochromatized krypton lamp for ultraviolet photoelectron spectrometry","authors":"Petr Tsygankov ,&nbsp;Eduardo Orozco ,&nbsp;Carlos Páez-González ,&nbsp;Alejandro David Martínez ,&nbsp;Fredy Parada-Becerra","doi":"10.1016/j.sab.2025.107284","DOIUrl":"10.1016/j.sab.2025.107284","url":null,"abstract":"<div><div>A method for the monochromation of an ultraviolet lamp for photoelectron spectrometry using a temperature-controlled magnesium fluoride filter is presented. Typically, open optical path helium discharge lamps are used as the light source for this technique, requiring complex differential pumping systems. A simple alternative solution using a sealed krypton resonance lamp with an independently heated magnesium fluoride glass filter is described. By heating the this output filter to 170–180 °C, its short wavelength transmittance limit is shifted, selectively blocking the 116.5 nm low intensity resonance line while maintaining transparency to the main line of 123.6 nm (10.03 eV). Validation of the method through work function measurements on polycrystalline copper samples yielded values of 4.6 ± 0.1 eV, consistent with data reported in the literature. This technique offers a more accessible and less complex solution for spectrometry laboratories without compromising measurement accuracy.</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"232 ","pages":"Article 107284"},"PeriodicalIF":3.2,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144713878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}