Article
Chemistry, Analytical
Yuzo Nishizaki, David C. Lankin, Shao-Nong Chen, Guido F. Pauli
Summary: This study utilized the principle of reciprocity and certified reference materials to achieve accuracy and precision in external calibration qHNMR. By optimizing nutation experiments and carefully timing the tuning and matching process, the achieved accuracy of around 1.0% demonstrates the feasibility of EC-qHNMR as a highly practical research tool.
ANALYTICAL CHEMISTRY
(2021)
Article
Automation & Control Systems
Richard J. C. Brown, Ki-Hyun Kim
Summary: The study presents a simple standard addition calibration procedure for quantification of unknown components in environmental samples and measurement of sample volume. This method is most suitable for environmental samples requiring a digestion or extraction step before analysis.
CHEMOMETRICS AND INTELLIGENT LABORATORY SYSTEMS
(2021)
Article
Food Science & Technology
Shijie Tian, Wei Liu, Huirong Xu
Summary: Soluble solids content (SSC) is crucial for kiwifruit as it determines its flavor and maturity assessment. Although Vis/NIR spectroscopy is widely used to evaluate SSC, local calibration models may not be effective for new batches of samples with biological variability, limiting its commercial application. Therefore, a calibration model was developed using one batch and tested with a different batch to improve prediction performance.
FOOD RESEARCH INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
R. Alex Mayo, Erin R. Johnson
Summary: This study introduces a new method to improve crystal structure comparison by utilizing calculated PXRD, with an anisotropic volume correction technique to distinguish matching structures from other candidates. This method outperforms currently available PXRD comparison methods in separating similar structures and has demonstrated its effectiveness in distinguishing polytypes and identifying uncredited matching structures.
Article
Chemistry, Multidisciplinary
Carolin Rieg, Daniel Dittmann, Zheng Li, Robert Lawitzki, Katrin Gugeler, Sarah Maier, Guido Schmitz, Johannes Kaestner, Deven P. Estes, Michael Dyballa
Summary: This study compared three methods for quantitatively distinguishing the location of noble metal particles in mesopores from those on the external support surface, and evaluated the effectiveness of using phosphine/NM ratios and pore filling techniques to determine the distribution of NMs. The results showed that the method of filling pores with TEOS proved promising for accurately locating NMs on the external surface, providing insights for future research on the characterization and quantification of NM distribution in mesoporous materials.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Geosciences, Multidisciplinary
Shih-Wei Fang, Myriam Khodri, Claudia Timmreck, Davide Zanchettin, Johann Jungclaus
Summary: This study decomposes the Atlantic multidecadal variability into internal and external components using a multi-model ensemble, finding that the internal component is closely related to the Atlantic meridional overturning circulation and dominates the fluctuations of AMV; while the external signal has limited impacts on AMOC.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Tristan Maschmeyer, Breanna Conklin, Thomas C. Malig, David J. Russell, Kenji L. Kurita, Jason E. Hein, Jose G. Napolitano
Summary: Nuclear magnetic resonance (NMR) spectroscopy is a powerful analytical technique that provides quantitative and structural information about multiple components in a sample. This study describes a simple and robust method to determine concentration conversion factors using linear regression models in NMR systems, and applies this method to monitor a pharmaceutically relevant amide coupling reaction.
MAGNETIC RESONANCE IN CHEMISTRY
(2023)
Article
Mechanics
Kamlesh Kumar, Deepu Prabhakaran
Summary: This study investigates the non-linear dynamics of an extremely thin-walled collapsible tube with internal flow subjected to a time-varying external pressure. The system exhibits fixed-point, period-1, and quasiperiodic attractors under constant chamber pressure, with increasing asymmetry as the Reynolds number increases. With varying chamber pressure, the system's response can be period-n, quasiperiodic, or chaotic, depending on the Reynolds number, driving amplitude, and frequency. The experiments show that the external forcing dominates the oscillations at low Reynolds numbers, while the self-excited oscillations dominate at higher Reynolds numbers. Aperiodic oscillations are observed beyond the Hopf bifurcation point of the unforced system. The forced system exhibits signs of quasiperiodic route to chaos at lower driving amplitude and period-doubling route to chaos at higher driving amplitude. Aperiodic response is suppressed when the system is forced near its natural frequency.
Article
Optics
Chenhui Hu, Lei Chen, Donghui Zheng, Yuntao Wang, Zhiyao Ma, Zhe Zhang
Summary: In this study, an iterative retrace error correction method in interferometry was proposed. A black-box model was established based on the relationship between the retrace error and the tilt of the testing surface. Error correction phase was obtained using the least-squares method, and global tilt was determined to iteratively correct the retrace error. The results demonstrate the effective correction of the retrace error.
Review
Computer Science, Information Systems
Zhien Liu, Zhenwei Chen, Xiaoxu Wei, Wan Chen, Yongsheng Wang
Summary: With the rapid development of autonomous driving, robotics, and intelligent transportation, multi-sensor-based environment sensing technology for intelligent vehicles has become a popular research direction. This paper introduces offline and online calibration technologies, and the online calibration technology based on deep learning has shown higher accuracy compared to traditional methods. Learning the relative relationships between sensors through neural networks is the most effective method, and the process is relatively free of human intervention.
Article
Chemistry, Analytical
Zewei Cui, Man He, Beibei Chen, Bin Hu
Summary: This study proposed a method based on laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) to quantitatively analyze multiple elements in plants by using a mixture of gelatin (GA) and hydroxypropyl methyl cellulose (HPMC) to simulate the plant matrix. The composition of the GA & HPMC substrate was optimized and demonstrated good elemental homogeneity. The method was further applied to analyze certified reference materials (CRMs) of different plants and perform elemental imaging in Trigonotis peduncularis leaves.
ANALYTICA CHIMICA ACTA
(2023)
Article
Physics, Applied
A. J. Healey, L. T. Hall, G. A. L. White, T. Teraji, M. -A. Sani, F. Separovic, J. -P. Tetienne, L. C. L. Hollenberg
Summary: This study presents evidence of polarizing interaction between shallow N-V ensemble and external nuclear targets over a micrometer scale, and discusses the challenges in achieving useful polarization enhancement. The results suggest the feasibility of implementing this technique for NMR sensitivity enhancement following realistic diamond material improvements.
PHYSICAL REVIEW APPLIED
(2021)
Article
Geosciences, Multidisciplinary
Y. Lin, Q. Yang, Q. Shi, Y. Nakayama, D. Chen
Summary: Accurate estimation of sea-ice production is crucial for understanding Antarctic Bottom Water formation. Existing methods have unrealistic assumptions and cannot consider sea-ice melting. We propose a new volume-conservation based method that captures synoptic SIP variations, including small-scale melting and freezing patterns. Using this method, we estimated the sea-ice melting rate induced by warm water in the Maud Rise Polynya to be 0.15 and 1.44 cm d(-1) for 2016 and 2017.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Optics
K. A. I. G. E. LIu, H. E. N. G. K. A. N. G. Zhang, Z. E. Q. I. LIu, B. I. N. Zhang, X. I. N. G. Fu, Q. I. A. N. G. Liu
Summary: This Letter proposes a transmission matrix-based phase correction method for achieving precise phase modulation. By measuring the transmission matrix, the phase modulation for ideal focusing can be obtained, and the spatial distribution of phase distortion can be extracted from the conjugate of the phase modulation. Experimental results demonstrate the feasibility of this method for phase distortion correction.
Article
Mathematics, Applied
A. Bensoussan, A. Brouste, F. B. Cartiaux, C. Mathey, L. Mertz
Summary: This paper investigates the response of a one-dimensional system with friction and demonstrates the elegant approach provided by variational inequalities theory to establish the existence and uniqueness of the solution. By applying the theory to a real structure with real data, the model's qualitative agreement with actual data is shown.
PHYSICA D-NONLINEAR PHENOMENA
(2021)
