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Journal of Applied Spectroscopy最新文献

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Synthesis and Luminescence Properties of Na2Al2B2O7:M (M = Dy3+ and Sm3+) Na2Al2B2O7:M (M = Dy3+ 和 Sm3+) 的合成与发光特性
IF 0.8 4区 化学
Journal of Applied Spectroscopy Pub Date : 2024-11-20 DOI: 10.1007/s10812-024-01826-5
İlhan Pekgözlü
{"title":"Synthesis and Luminescence Properties of Na2Al2B2O7:M (M = Dy3+ and Sm3+)","authors":"İlhan Pekgözlü","doi":"10.1007/s10812-024-01826-5","DOIUrl":"10.1007/s10812-024-01826-5","url":null,"abstract":"<p>Dy<sup>3+</sup>- and Sm<sup>3+</sup>-doped Na<sub>2</sub>Al<sub>2</sub>B<sub>2</sub>O<sub>7</sub> phosphors were synthesized at 850°C for 6 h in air. The phase analyses of all prepared borates were carried out using powder X-ray diffraction (XRD). A spectrofluorometer was used to examine the photoluminescence (PL) characteristics of the prepared phosphors at room temperature. When excited at 350 nm, Na<sub>2</sub>Al<sub>2</sub>B<sub>2</sub>O<sub>7</sub>:Dy<sup>3+</sup> radiates at 481–491, 575–583, and 673 nm. After being excited at 402 nm, Na<sub>2</sub>Al<sub>2</sub>B<sub>2</sub>O<sub>7</sub>:Sm<sup>3+</sup> radiates at 561, 603, 650, and 709 nm. As a result of this study, two new optical materials that emit light in the visible region were prepared.</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"91 5","pages":"1105 - 1109"},"PeriodicalIF":0.8,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Rapid Detection of Imidacloprid in Apple Juice by Ultraviolet Spectroscopy Coupled with Support Vector Regression and Variable Selection Methods 利用紫外光谱与支持向量回归和变量选择方法快速检测苹果汁中的吡虫啉
IF 0.8 4区 化学
Journal of Applied Spectroscopy Pub Date : 2024-11-20 DOI: 10.1007/s10812-024-01829-2
Delong Meng, Lin Li, Zhenlu Liu, Ciyong Gu, Weichun Zhang, Zhimin Zhao
{"title":"Rapid Detection of Imidacloprid in Apple Juice by Ultraviolet Spectroscopy Coupled with Support Vector Regression and Variable Selection Methods","authors":"Delong Meng,&nbsp;Lin Li,&nbsp;Zhenlu Liu,&nbsp;Ciyong Gu,&nbsp;Weichun Zhang,&nbsp;Zhimin Zhao","doi":"10.1007/s10812-024-01829-2","DOIUrl":"10.1007/s10812-024-01829-2","url":null,"abstract":"<p>The widespread use of pesticides poses many potential risks to food safety and human health. Thus, rapid and accurate detection methods for pesticide residues need to be established. In this study, ultraviolet (UV) spectroscopy coupled with support vector regression and variable selection methods was used to quantitatively detect the content of imidacloprid in apple juice. First, the UV spectra of diff erent imidacloprid concentrations in apple juice were collected, and the acquired spectra were preprocessed by Savitzky–Golay smoothing. Then, the feature variables were selected by the variable iterative space shrinkage approach (VISSA), iteratively retains informative variables (IRIV), and random frog (RF) algorithms. Finally, particle swarm optimization support vector regression (PSOSVR) prediction models based on the feature variables and the full-spectrum variables were established to detect imidacloprid in apple juice. The results showed that the VISSA–PSO-SVR model had the optimal predictive performance, the determination coefficient of the prediction set (R<sub>p</sub><sup>2</sup>) was 0.99933, and the root mean square error of the prediction set (RMSEP) was 0.0894 mg/L. The results from this study indicated that the combination of UV spectroscopy and the VISSA–PSO-SVR model could be used for the quantitative detection of imidacloprid in apple juice.</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"91 5","pages":"1126 - 1132"},"PeriodicalIF":0.8,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Photophysical Features of Protolytic Equilibria of Fluorescein Bifluorophores 荧光素双荧光团原生溶解平衡的光物理特征
IF 0.8 4区 化学
Journal of Applied Spectroscopy Pub Date : 2024-11-19 DOI: 10.1007/s10812-024-01820-x
F. Fan, V. A. Povedailo, I. L. Lysenko, O. L. Sharko, I. O. Mazunin, S. A. Tikhomirov, V. V. Shmanai
{"title":"Photophysical Features of Protolytic Equilibria of Fluorescein Bifluorophores","authors":"F. Fan,&nbsp;V. A. Povedailo,&nbsp;I. L. Lysenko,&nbsp;O. L. Sharko,&nbsp;I. O. Mazunin,&nbsp;S. A. Tikhomirov,&nbsp;V. V. Shmanai","doi":"10.1007/s10812-024-01820-x","DOIUrl":"10.1007/s10812-024-01820-x","url":null,"abstract":"<p>The effects of pH and the solution composition on the photophysical properties of two carboxyfluorescein bifluorophores were studied along with a comparison of the fluorescence effect of these bifluorophores with that of monomer carboxyfluoresceins (5-FAM and 6-FAM) in conjugates with protein molecules. Both the bifluorophores were found to fluoresce well in an alkaline medium but the fluorescence intensity decreased at pH 6–7 and almost disappeared in acidic media. The fluorescence of meta-(6-FAM)<sub>2</sub> is very sensitive to the solution composition, while the fluorescence of meta-(5-FAM)<sub>2</sub> is more stable and depends only slightly on the solution properties. Upon formation of a conjugate of the bifluorophore with a protein, the fluorescence yield of the bifluorophore decreases to a greater extent in comparison with the FAM monomers but the total fluorescence yield is not less than the intensities of the two carboxyfluorescein monomer–protein conjugates due to the high extinction coefficient of the bifluorophore (~140,000 M<sup>–1</sup>·cm<sup>–1</sup>).</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"91 5","pages":"1055 - 1064"},"PeriodicalIF":0.8,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electrically Controlled Liquid Crystal Twist-Planar Fresnel Lens 电控液晶扭转平面菲涅尔透镜
IF 0.8 4区 化学
Journal of Applied Spectroscopy Pub Date : 2024-11-19 DOI: 10.1007/s10812-024-01822-9
E. A. Mel’nikova, E. P. Panteleeva, D. V. Gorbach, A. L. Tolstik, I. I. Rushnova, O. S. Kabanova
{"title":"Electrically Controlled Liquid Crystal Twist-Planar Fresnel Lens","authors":"E. A. Mel’nikova,&nbsp;E. P. Panteleeva,&nbsp;D. V. Gorbach,&nbsp;A. L. Tolstik,&nbsp;I. I. Rushnova,&nbsp;O. S. Kabanova","doi":"10.1007/s10812-024-01822-9","DOIUrl":"10.1007/s10812-024-01822-9","url":null,"abstract":"<p>Based on the method of photo-orientation of the azo-dye AtA-2, an electrically controlled Fresnel lens has been developed which is a microstructured liquid crystal element made up of alternating rings with twist- and planar orientations of the liquid crystal director. It is shown that the use of a control voltage makes it possible to control the efficiency of the focusing of laser radiation, as well as to turn off the lens. An optimum control voltage (~3 V) is determined at which a maximum focal efficiency and satisfactory quality of image construction over a wide spectral range from 530 nm to 1.1 μm are attained.</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"91 5","pages":"1072 - 1077"},"PeriodicalIF":0.8,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
UV-Vis Spectrophotometric Method Development and Validation of Mirabegron Via Green Approach 通过绿色方法开发和验证米拉贝琼的紫外可见分光光度法
IF 0.8 4区 化学
Journal of Applied Spectroscopy Pub Date : 2024-11-19 DOI: 10.1007/s10812-024-01827-4
Chirag H. Dhamal, Kanji D. Kachhot, Foram H. Vaghela, Hitendra S. Joshi
{"title":"UV-Vis Spectrophotometric Method Development and Validation of Mirabegron Via Green Approach","authors":"Chirag H. Dhamal,&nbsp;Kanji D. Kachhot,&nbsp;Foram H. Vaghela,&nbsp;Hitendra S. Joshi","doi":"10.1007/s10812-024-01827-4","DOIUrl":"10.1007/s10812-024-01827-4","url":null,"abstract":"<p>An innovative, meticulously crafted, targeted, expeditious, precise, and cost-effective methodology was pioneered utilizing UV-Vis spectrophotometry for the quantitative determination of Mirabegron in both its pristine state and pharmaceutical tablet formulation. Following thorough deliberation on factors such as solubility, stability, toxicity, and carcinogenicity, petroleum ether emerged as the solvent of choice, aligning with the principles of environmentally conscious methodology. The absorption maxima were unequivocally detected at a wavelength of 250 nm, making petroleum ether the solvent of choice. The method adheres faithfully to Beer's law within a concentration range spanning from 0.004 to 0.016 mg/mL, boasting a remarkable correlation coefficient of 0.9945. LOD and LOQ were meticulously computed from the dataset, yielding values of 0.0001663 and 0.0005039, respectively. The relative standard deviation, meticulously derived from the dataset, stands at less than 2%. Moreover, in the rigorous accuracy assessment, Mirabegron's recovery percentage fell impressively within the narrow band of 98.62 to 101.46%. During both the intraday and interday precision evaluations, the %Assay remained consistently within the stringent range of 99.63 to 101.12%, affirming the method's precision. Furthermore, adherence to the rigorous guidelines outlined in ICH Q2 (R1) was ensured throughout the comprehensive validation process, consolidating the method's credibility and suitability for analytical applications.</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"91 5","pages":"1110 - 1117"},"PeriodicalIF":0.8,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Regularization of Parallel Factor Analysis (PARAFAC): A New Approach to Determining Groups of Fluorophores in Fluorescence Spectra of Natural Waters 并行因子分析正则化（PARAFAC）：确定天然水荧光光谱中荧光团的新方法
IF 0.8 4区 化学
Journal of Applied Spectroscopy Pub Date : 2024-11-19 DOI: 10.1007/s10812-024-01821-w
I. N. Krylov, O. N. Erina, A. N. Drozdova, I. V. Seliverstova, T. A. Labutin
{"title":"Regularization of Parallel Factor Analysis (PARAFAC): A New Approach to Determining Groups of Fluorophores in Fluorescence Spectra of Natural Waters","authors":"I. N. Krylov,&nbsp;O. N. Erina,&nbsp;A. N. Drozdova,&nbsp;I. V. Seliverstova,&nbsp;T. A. Labutin","doi":"10.1007/s10812-024-01821-w","DOIUrl":"10.1007/s10812-024-01821-w","url":null,"abstract":"<p>Parallel factor analysis (PARAFAC) is widely used in relation to fluorescence excitation/emission spectra to track the movement of water masses and to study seasonal changes in the composition and content of dissolved organic matter. The stage of selecting the number of components is one of the most difficult when using factor analysis. The widely used method of analyzing loads when splitting the original set into halves in many cases does not allow a determination of the best model because of the closeness of their statistical estimates. Because the use of regularization with a penalty for the sum of parameter modules tends to lead to sparse solutions in which some of the coefficients are equal to zero, the use of this approach allows one to select those variables that carry useful information. A procedure is proposed for selecting the number of components when performing parallel factor analysis of fluorescence spectra using a penalty for the 1- and 2-norms of the solution.</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"91 5","pages":"1065 - 1071"},"PeriodicalIF":0.8,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Luminescence of Sr3Y(BO3)3 Activated with Tb3+ and Gd3+ 用 Tb3+ 和 Gd3+ 活化的 Sr3Y(BO3)3 的发光特性
IF 0.8 4区 化学
Journal of Applied Spectroscopy Pub Date : 2024-11-19 DOI: 10.1007/s10812-024-01825-6
Khushbu Sharma, Renuka Nafdey, S. V. Moharil
{"title":"Luminescence of Sr3Y(BO3)3 Activated with Tb3+ and Gd3+","authors":"Khushbu Sharma,&nbsp;Renuka Nafdey,&nbsp;S. V. Moharil","doi":"10.1007/s10812-024-01825-6","DOIUrl":"10.1007/s10812-024-01825-6","url":null,"abstract":"<p>STACK family borates are promising compounds for optical applications. Synthesis and luminescence of Sr<sub>3</sub>Y(BO<sub>3</sub>)<sub>3</sub> borate belonging to the STACK family is described. Trivalent activators Tb<sup>3+</sup> and Gd<sup>3+</sup> occupy yttrium sites. Owing to fixed, well-separated positions (Y–Y distance 7.396 Å), a large concentration of Gd<sup>3+</sup>, as much as 50% relative to Y, could be accommodated without causing concentration quenching. In the case of Gd<sup>3+</sup>, both excitation and emission lines arise in f–f transitions. Photoluminescence emission is obtained in UV regions. In the case of Tb<sup>3+</sup>, concentration quenching was observed above 2%. Prominent excitation of Tb<sup>3+</sup> is in the form of a band arising in the f–d-type transition, while emission comes from f–f transitions. Emission lifetimes are of the order of milliseconds, typically forbidden f–f transitions.</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"91 5","pages":"1097 - 1104"},"PeriodicalIF":0.8,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Solvatochromism, Hydrogen Bonding Induced Charge Transfer, and Influence of pH on Electronic Absorption Spectra of Murexide 溶解变色、氢键诱导电荷转移以及 pH 值对氧化亚甲基脲电子吸收光谱的影响
IF 0.8 4区 化学
Journal of Applied Spectroscopy Pub Date : 2024-11-19 DOI: 10.1007/s10812-024-01824-7
Sokaina Saad Hemdan, Mamdouh S. Masoud, Rehab M. I. Elsamra
{"title":"Solvatochromism, Hydrogen Bonding Induced Charge Transfer, and Influence of pH on Electronic Absorption Spectra of Murexide","authors":"Sokaina Saad Hemdan,&nbsp;Mamdouh S. Masoud,&nbsp;Rehab M. I. Elsamra","doi":"10.1007/s10812-024-01824-7","DOIUrl":"10.1007/s10812-024-01824-7","url":null,"abstract":"<p>A study of the solvent effect was used to describe the pronounced change in position of the UV-Visible absorption band associated with changing the polarity of the medium. Murexide compound which has different position of UV-Visible absorption band in the protic and nonprotic solvents. Various solvent parameters, such as dielectric constant, refractive index, Kamlet–Taft and Catalán parameters were used for the evaluation of the solute–solvent interactions and the solvatochromic shifts of the UV-Vis absorption maximum of the investigated indicator. The phenomenon of tautomerism is explained. The Kamlet–Taft solvent scale was found to be the most appropriate to describe the solvatochromic behavior of the Murexide. The dissociation constant pK<sub>a</sub> and the isosbestic point of the investigated compound showed the presence of the individual predominate ionic species in different pH ranges.</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"91 5","pages":"1086 - 1096"},"PeriodicalIF":0.8,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hybrid Structures Based on Silver Nanoparticles and Polyelectrolytes for Sensitive Fluorescent Solid-Phase Immunoassay 基于银纳米粒子和聚电解质的杂化结构用于灵敏的荧光固相免疫测定
IF 0.8 4区 化学
Journal of Applied Spectroscopy Pub Date : 2024-11-15 DOI: 10.1007/s10812-024-01816-7
O. S. Kulakovich, A. A. Ramanenka, I. V. Koktysh, Ya. I. Melnikova, V. I. Stsiapura, S. V. Gaponenko, S. A. Maskevich
{"title":"Hybrid Structures Based on Silver Nanoparticles and Polyelectrolytes for Sensitive Fluorescent Solid-Phase Immunoassay","authors":"O. S. Kulakovich,&nbsp;A. A. Ramanenka,&nbsp;I. V. Koktysh,&nbsp;Ya. I. Melnikova,&nbsp;V. I. Stsiapura,&nbsp;S. V. Gaponenko,&nbsp;S. A. Maskevich","doi":"10.1007/s10812-024-01816-7","DOIUrl":"10.1007/s10812-024-01816-7","url":null,"abstract":"<p>The effect of surface modification of polystyrene plates for immunoassay with silver nanoparticles and polyelectrolytes on the fluorescent signal of adsorbed antibodies with fluorescent labels IgG-FITC, IgG-AF488 and IgG-AF647 was studied. The resulting solid phase was characterized by a sorption capacity increased by 30–50% as compared to high-binding polystyrene (Greiner, Austria) and the ability to enhance the fluorescent signals of the labels due to a plasmonic effect, which together increased the fluorescence intensity by 3–15 times, depending on the type of plate surface, the nature of the polyelectrolyte, and the optical and physicochemical properties of the labeled antibodies.</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"91 5","pages":"1025 - 1031"},"PeriodicalIF":0.8,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enhancement of Photochromism in Poly(Vinyl Alcohol)–Phosphotungstic Acid Nanocomposites Using a Low-Molecular-Weight Alcohol Additive 使用低分子量酒精添加剂增强聚乙烯醇-磷钨酸纳米复合材料的光致变色性
IF 0.8 4区 化学
Journal of Applied Spectroscopy Pub Date : 2024-11-15 DOI: 10.1007/s10812-024-01818-5
A. A. Gorbachev, O. N. Tretinnikov
{"title":"Enhancement of Photochromism in Poly(Vinyl Alcohol)–Phosphotungstic Acid Nanocomposites Using a Low-Molecular-Weight Alcohol Additive","authors":"A. A. Gorbachev,&nbsp;O. N. Tretinnikov","doi":"10.1007/s10812-024-01818-5","DOIUrl":"10.1007/s10812-024-01818-5","url":null,"abstract":"<p>Poly(vinyl alcohol) (PVA)–phosphotungstic acid (PTA) nanocomposite films were prepared from aqueous solutions with added ethylene glycol (EG), which is a plasticizer for PVA and contains OH groups, capable of being electron donors in the photoreduction of PTA. Spectroscopic studies have shown that the addition of EG significantly enhances the photochromic properties of the resultant nanocomposites due to photoinduced electron transfer from the organic matrix of the nanocomposite to PTA molecules.</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"91 5","pages":"1042 - 1046"},"PeriodicalIF":0.8,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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