Spectroscopy最新文献_第4页

Evaluation of Shifted-Excitation Raman Difference Spectroscopy and Comparison to Ordinary Portable Raman Spectroscopy in Identification of Seized Drugs 位移激发拉曼差分光谱的评价及与普通便携式拉曼光谱鉴别扣押药品的比较

IF 0.5 4区化学

Spectroscopy Pub Date : 2023-08-01 DOI: 10.56530/spectroscopy.xy6377n5

Ling-yu Zhao, Guo-ping Wu, Yuan-zhao Wu

{"title":"Evaluation of Shifted-Excitation Raman Difference Spectroscopy and Comparison to Ordinary Portable Raman Spectroscopy in Identification of Seized Drugs","authors":"Ling-yu Zhao, Guo-ping Wu, Yuan-zhao Wu","doi":"10.56530/spectroscopy.xy6377n5","DOIUrl":"https://doi.org/10.56530/spectroscopy.xy6377n5","url":null,"abstract":"Rapid and accurate identification and detection of illicit drugs are important for combating drug crimes. As a newly developed technology, shifted-excitation Raman difference spectroscopy (SERDS) can greatly reduce the interference caused by fluorescence and improve the potential of Raman for distinguishing drug compounds in seized samples with fluorescent additives. In this work, 43 random seized drugs were scanned and analyzed by both SERDS and ordinary portable Raman spectrometers for the first time. The detected results of two Raman technologies were confirmed with gas chromatographic mass spectrometry test results, and compared in detail in the aspects of detection rate and matching accuracy. SERDS had significant advantages in eliminating fluorescence interference with a very high detection rate of 93.0%, compared with 53.3% obtained by an ordinary Raman spectrometer, although the ordinary Raman spectrometer analyzed the composition of multi-component mixed samples with higher accuracy. To some extent, the two Raman spectrometers realized functional complementarity, and a rational use of the two types of Raman spectrometers may be of benefit in the rapid detection of seized drugs.","PeriodicalId":21957,"journal":{"name":"Spectroscopy","volume":"11 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79664691","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

Flexible Stacked Partial Least Squares for Mid-Infrared Spectroscopy Glucose Detection 柔性叠置偏最小二乘中红外光谱葡萄糖检测

IF 0.5 4区化学

Spectroscopy Pub Date : 2023-08-01 DOI: 10.56530/spectroscopy.ww1181l1

Sicong Zhu, H. Gu, Zhushanying Zhang, J. Sa, Dongyun Zheng, Huimin Cao, Q. Xie

引用次数: 0

The Detection of Biomarkers and Cocaine in Fingernails Using Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy 衰减全反射傅里叶变换红外光谱法检测指甲中的生物标志物和可卡因

IF 0.5 4区化学

Spectroscopy Pub Date : 2023-08-01 DOI: 10.56530/spectroscopy.oe1567k3

Megan Wilson, J. Birkett, Iftikhar Khan, Ismail Abbas, Leung Tang, D. Al-Jumeily, S. Assi

引用次数: 0

Key Points to Remember When Using Internal Standards for Sample Analysis by ICP-OES ICP-OES样品分析使用内部标准时应注意的要点

IF 0.5 4区化学

Spectroscopy Pub Date : 2023-08-01 DOI: 10.56530/spectroscopy.gb4767c3

D. Bradshaw

引用次数: 0

Technological Analysis of Glazed Tiles Unearthed from Bao’ensi in Nanjing 南京宝恩寺釉面砖的工艺分析

IF 0.5 4区化学

Spectroscopy Pub Date : 2023-07-01 DOI: 10.56530/spectroscopy.jc4473j7

D. Zhao, Bo Wu, Bo Li, Baohua Zhou, Jianfeng Cui, Weijuan Zhao, Qinlong Chen

{"title":"Technological Analysis of Glazed Tiles Unearthed from Bao’ensi in Nanjing","authors":"D. Zhao, Bo Wu, Bo Li, Baohua Zhou, Jianfeng Cui, Weijuan Zhao, Qinlong Chen","doi":"10.56530/spectroscopy.jc4473j7","DOIUrl":"https://doi.org/10.56530/spectroscopy.jc4473j7","url":null,"abstract":"To understand the firing technology and the level of production of glazed tiles in the Ming Dynasty, an ultraviolet-visible-near-infrared (UV-vis-NIR) spectrophotometer and an energy-dispersive X-ray fluorescence (XRF) spectrometer were used to systematically analyze the glaze color and chemical composition of glazed tiles unearthed from the southern area of the Bao’ensi site. The results revealed that little difference exists in the main wavelengths of the same glazed tile samples, but that the colored elements of glaze with different colors are different. Iron (Fe) is the main element that affects the color of yellow glaze; copper (Cu) is the main element that affects the color of green glaze; and the main colorants that affect the color of black glaze are Fe, Cu, and manganese (Mn). The yellow and black glaze unearthed from the southern area of the Bao’ensi site were relatively mature in terms of raw material composition and technological formula, whereas the raw material and technological formula of green glaze were not stable enough. To meet temple construction needs, workers were skilled in firing glazed tiles with different glaze color requirements, indicating that the glaze color of the glazed tiles was relatively mature at that time.","PeriodicalId":21957,"journal":{"name":"Spectroscopy","volume":"3 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80957401","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

Differentiating Glycans by Surface-Enhanced Raman Spectroscopy 用表面增强拉曼光谱鉴别聚糖

IF 0.5 4区化学

Spectroscopy Pub Date : 2023-07-01 DOI: 10.56530/spectroscopy.mt7469p9

J. Chasse

引用次数: 0

Preparation and Spectral Properties of MgAl2O4: Tb3+ Phosphor MgAl2O4: Tb3+荧光粉的制备及其光谱性质

IF 0.5 4区化学

Spectroscopy Pub Date : 2023-07-01 DOI: 10.56530/spectroscopy.xr3287v2

Shi Zhongxiang, Shi Jun, Wang Jing, Lu Yang, Liu Yongfu

{"title":"Preparation and Spectral Properties of MgAl2O4: Tb3+ Phosphor","authors":"Shi Zhongxiang, Shi Jun, Wang Jing, Lu Yang, Liu Yongfu","doi":"10.56530/spectroscopy.xr3287v2","DOIUrl":"https://doi.org/10.56530/spectroscopy.xr3287v2","url":null,"abstract":"A series of Tb3+ doped cubic MgAl2O4 green phosphors were synthesized via hydrothermal method followed by a post-annealing process. The variation regularity of phase structure, morphology, particle size and concentration quenching mechanism were investigated. The results showed that the crystal structure of matrix materials was not affected when Tb3+ ions were introduced. In addition, the micrometer-sized rods and excellent dispersion of the particles were obtained by adding urea. Under excitation at 377 nm, the phosphors exhibited the characteristic of Tb3+ emissions with the peaks located at 488 nm (5D4 → 7F6), 544 nm (5D4 → 7F5) and 588 nm (5D4 → 7F4), respectively. Moreover, based on optical analysis, it can be inferred that electric dipole-dipole (d-d) interaction plays an important role in concentration quenching process of Tb3+ ions. The green light emitting phosphor MgAl2O4: Tb3+ can be realized by adjusting the concentrations of Tb3+, and the optimum concentration of Tb3+ ions in MgAl2O4 was found to be 0.02. Finally, the average fluorescence decay lifetime and the CIE chromaticity coordinates of Mg0.98Al2O4: 0.02Tb3+ phosphor were calculated to be 1.2005 ms and (0.3197 0.4109), respectively. The above results suggest that the developed phosphor could have potential to be used as a single-phase green emission phosphor for near-ultraviolet light-emitting diode (NUV-LED) applications.","PeriodicalId":21957,"journal":{"name":"Spectroscopy","volume":"57 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76077209","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: 1

Infrared Spectroscopy of Polymers XIII: Polyurethanes 聚合物的红外光谱学十三:聚氨酯

IF 0.5 4区化学

Spectroscopy Pub Date : 2023-07-01 DOI: 10.56530/spectroscopy.fn3378a3

B. Smith

引用次数: 1

Contamination Control During Sample Preparation for Trace Element Analysis of Electronic Cigarette Aerosol with Inductively Coupled Plasma-Mass Spectrometry, Part 2 电感耦合等离子体质谱法分析电子烟气溶胶微量元素样品制备过程中的污染控制，第2部分

4区化学

Spectroscopy Pub Date : 2023-07-01 DOI: 10.56530/spectroscopy.kh5380l2

R. Steven Pappas, Naudia Gray

引用次数: 0

Identifying Freshness of Shrimp Following Refrigeration Using Near-Infrared Hyperspectral Imaging 利用近红外高光谱成像技术鉴定冷藏后虾的新鲜度

IF 0.5 4区化学

Spectroscopy Pub Date : 2023-06-01 DOI: 10.56530/spectroscopy.kz7587y6

Ron Ye, Chunhong Liu, Daoliang Li, Yingyi Chen, Yuchen Guo, Qingling Duan

{"title":"Identifying Freshness of Shrimp Following Refrigeration Using Near-Infrared Hyperspectral Imaging","authors":"Ron Ye, Chunhong Liu, Daoliang Li, Yingyi Chen, Yuchen Guo, Qingling Duan","doi":"10.56530/spectroscopy.kz7587y6","DOIUrl":"https://doi.org/10.56530/spectroscopy.kz7587y6","url":null,"abstract":"Shrimp tends to deteriorate during the refrigeration process. To monitor the freshness of shrimp during refrigeration, near-infrared (NIR) hyperspectral imaging was utilized to non-destructively identify the freshness of shrimp. In the process, three preprocessing methods (multivariate scatter correction [MSC], standard normal variate [SNV], and direct orthogonal signal correction [DOSC]) were employed to preprocess the full-wavelength spectral data, and three characteristic wavelength extraction algorithms (competitive adaptive reweighted sampling [CARS], and random forest [RF] simulated annealing [SA]) were used to extract the best-pre-processed data. Because extreme learning machine (ELM) and kernel extreme learning machine (KELM) are easily affected by parameters, ELM (based on teaching-learning-based optimization [TLBO]) and KELM (based on teaching-learning-based optimization [TLBO]) were proposed. In this study, four discriminant models (ELM, TLBO– ELM, KELM, and TLBO–KELM) were used for the full wavelength modeling analysis and the characteristic wavelength modeling analysis. In this work, the results of the final selected models are presented.","PeriodicalId":21957,"journal":{"name":"Spectroscopy","volume":"60 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84655303","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