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Showing 141 - 160 results of 431 for search 'spectral composition method', query time: 0.11s Refine Results
  1. 141

    Variability of the component composition of the essential oil of <i>Artemisia salsoloides</i> Willd. from natural populations of the flora of Dagestan by F. A. Vagabova, A. M. Aliev, G. K. Radzhabov, M. M. Mallaliev

    Published 2024-04-01
    “…Aerial parts of A. salsoloides were collected during the flowering phase in four Dagestan natural populations to obtain essential oil using the Clevenger method. To determine the component composition of the samples obtained of essential oils of A. salsoloides, chromatography‐mass spectrometric analysis was used. …”
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  2. 142

    Macro- and Microelement Composition, Antioxidant Activity, and Biological Effect of Cold-Pressed Edible Oils from Commercial and Amateur Companies by Jolanta Marciniuk, Beata Sadowska, Marzena Więckowska-Szakiel, Mateusz Borkowski, Jacek Zebrowski, Bronisław K. Głód, Kacper Marciniuk, Paweł Marciniuk

    Published 2025-03-01
    “…The content of macro- and micronutrients was assessed using ICP-OES, the level of fatty acid unsaturation was examined using Fourier transform infrared spectroscopy (FTIR), and total antioxidant potential (TAP) was assessed using the DPPH method. The antimicrobial activity of the selected oils against Gram-positive and Gram-negative bacteria, as well as fungi, representing both pathogens and human microbiota, was tested using the broth microdilution method. …”
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  3. 143
  4. 144

    The Application of Near-Infrared Spectroscopy Combined with Chemometrics in the Determination of the Nutrient Composition in Chinese <i>Cyperus esculentus</i> L. by Xiaobo Jiao, Dongliang Guo, Xinjun Zhang, Yunpeng Su, Rong Ma, Lewen Chen, Kun Tian, Jingyu Su, Tangnuer Sahati, Xiahenazi Aierkenjiang, Jingjing Xia, Liqiong Xie

    Published 2025-01-01
    “…The nutritional content of tiger nut (<i>Cyperus esculentus</i> L.) is abundant, rich in oil, protein, and starch. Conventional methods for assessing the nutrient composition of tiger nuts (TNs) are time-consuming and labor-intensive. …”
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  5. 145

    Advances in machine learning for the detection and characterization of microplastics in the environment by M. Maksuda Khanam, M. Khabir Uddin, Julhash U. Kazi

    Published 2025-05-01
    “…Extending these capabilities further, hyperspectral imaging combines spatial and spectral data to generate comprehensive chemical maps, enabling the simultaneous assessment of polymer composition and distribution. …”
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    Article
  6. 146

    Comprehensive Quantitative Analysis of Coal-Based Liquids by Mask R-CNN-Assisted Two-Dimensional Gas Chromatography by Huan-Huan Fan, Xiang-Ling Wang, Jie Feng, Wen-Ying Li

    Published 2025-01-01
    “…Therefore, the development of a method for accurately and rapidly analyzing chromatograms is crucial for understanding the chemical compositions and structures of coal-based liquids, such as direct coal liquefaction (DCL) oils and coal tar. …”
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  7. 147

    A low complexity dynamic subarray combination method for MIMO transmitter by Cui WANG, Peng PAN, Shuai ZHANG, Junrong YAN

    Published 2020-08-01
    “…For the mmWave MIMO system using a partially-connected structure,in order to improve the spectral efficiency,the antenna composition of each subarray will be dynamically adjusted according to the channel conditions.However,the optimal grouping of antennas requires exhaustive searching for all possible antenna combinations according to certain criteri,which leads to unacceptable complexity.In response to the problem,a low-complexity sub-array dynamic allocation method was proposed.The core was to introduce certain rules when grouping array elements,thereby significantly reducing the number of combinations and reducing the search range.Specifically,two low-complexity antenna combination algorithms were proposed.Firstly,considering the strong correlation between mmWave antennas,multiple adjacent antennas were virtualized as an array element,thereby reducing the search space.Secondly,by dividing all antennas into upper and lower half areas,the antenna combination based on partition was realized,and the search space was also reduced.Simulation results show that the proposed method can achieve a good trade-off between performance and complexity.…”
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  8. 148
  9. 149

    Preparation and properties of phosphor coating based on nanostructured yttrium-aluminum garnet and low-melting glass by O. V. Uretskaya, N. E. Drobyshevskaya, E. N. Poddenezhny, A. I. Kravchenko, T. N. Savkova

    Published 2015-06-01
    “…The modes of synthesis, structural and spectral-luminescent characteristics of the nanostructured powders are optimized leading to garnet of chemical composition Y3-хCeхAl5O12 (х = 0.02–0.06) with the particles size of 40–60 nm, spherical form, a specific surface of 50 m2/g. …”
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  10. 150

    The application of near‐infrared spectroscopy to predict composition, gross energy yield, and methane production of natural forages on the Qinghai–Tibet Plateau by Runze Wang, Huakun Zhou, Yayu Huang, Allan Degen, Xueyan Du, Muhammad Irfan Malik, Rongzhen Zhong, Binqiang Bai, Lizhuang Hao

    Published 2025-03-01
    “…A total of 301 natural forage samples were collected, and their spectral data were acquired using NIRS. Conventional methods were used to measure the forage composition, and predictive models were developed based on the spectral data. …”
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  11. 151

    Application of NMR Method to Assess the Efficiency of Enhanced Oil Recovery Measures by N. K. Dvoyashkin, D. L. Melnikova, D. S. Ivanov, A. S. Aleksandrov, V. D. Skirda, K. D. Shumatbayev, A. D. Kurbanov

    Published 2024-12-01
    “…The paper presents the results of nuclear magnetic resonance (NMR) study of oil samples taken from production wells from the fields of the Republic of Tatarstan before and after the application of one of the enhanced oil recovery (EOR) methods, namely, flow rejection technology based on injection of microgel compositions into injection wells. …”
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  12. 152
  13. 153

    The component composition of the total flavonoid fractions from some <i>Ericaceae</i> family and their effect on the NO-stimulating activity of peritoneal macrophages by Ya. E. Reshetov, A. A. Ligacheva, E. S. Trofimova, N. S. Selivanova, S. V. Krivoshchekov, E. V. Basova, E. Yu. Sherstoboev, E. Yu. Avdeeva, I. P. Kaminsky, M. G. Danilets, M. V. Belousov

    Published 2024-09-01
    “…Comparative study of the composition of total flavonoid fractions from A. polifolia, C. calyculata, L. palustre, E. nigrum and study of their effect on the NO-stimulating activity of peritoneal macrophagesMaterials and methods. …”
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  14. 154

    Numerical modeling of complex radiative heat transfer by N. I. Moskalenko, L. V. Rodionov, M. S. Khamidullina, I. A. Afanasyev

    Published 2017-12-01
    “…Compared with the use of approximate methods of calculation functions of the spectral transmittance numerical simulation reveals the effects of enlightenment environment or enhancing its absorption as a function of the temperature field. …”
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  15. 155

    Balancing signature variance between local and global minima/maxima: Restricted maximum likelihood (REML) classification and the search for plagioclimax by N. Manspeizer, A. Karnieli

    Published 2025-12-01
    “…Due to long-term anthropogenic disturbance, plagioclimax results in vegetation compositions that cannot develop to a climax state. The overarching goal of the study was to develop a method to identify plagioclimax sub-regionally in the eastern Mediterranean (Israel) through signature extension. …”
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  16. 156
  17. 157

    Non-Destructive Evaluation of Cement Mortar Quality with Hyperspectral Remote Sensing Methods by I. Ahmed, U. K. Sharma, P. K. Garg, A. K. Thakur, Pritipadmaja

    Published 2025-07-01
    “…Overall, this research introduces spectral analysis as a non-destructive method for evaluating mortar quality. …”
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  18. 158

    A potential thermophotovoltaic emitter Er(Ta1−xNbx)O4 (0 ≤ x ≤ 0.2) with excellent selective emission performance by Mengtong Ma, Minzhong Huang, Liyan Xue, Kaixian Wang, Ting Zhou, Huimin Xiang, Canglong Wang, Fan Yang, Yiqun Deng, Heng Chen

    Published 2025-05-01
    “…To adjust the selective emissivity and spectral efficiency, a series of rare earth tantalate selective emitters (Er(Ta1−xNbx)O4 (0 ≤ x ≤ 0.2)) matching GaSb batteries were prepared by high-temperature solid-state reaction and pressureless sintering method. …”
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  19. 159

    Direct Spectrophotometric Method for Determination of Cadmium (II) Ions Using Bis-Thiosemicarbazone by Sulafa Nassar, Gharam I. Mohammed, Thoraya A. Farghaly

    Published 2025-01-01
    “…The solid complex, L-Cd, was determined using analytical methods including elemental analysis, UV-Vis spectra, spectral mass, and thermal analysis.…”
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  20. 160

    A Next-generation Exoplanet Atmospheric Retrieval Framework for Transmission Spectroscopy (NEXOTRANS): Comparative Characterization for WASP-39 b Using JWST NIRISS, NIRSpec PRISM,... by Tonmoy Deka, Tasneem Basra Khan, Swastik Dewan, Priyankush Ghosh, Debayan Das, Liton Majumdar

    Published 2025-01-01
    “…The advent of JWST has marked a new era in exoplanetary atmospheric studies, offering higher-resolution data and greater precision across a broader spectral range than previous space-based telescopes. …”
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    Article