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Real-time detection of gaseous isotopic water molecules via photoinduced associative ionization mass spectrometry: Direct identification realized by distinctive mass spectrum patterns.
Talanta
December 2024
China Nuclear Power Engineering Co., Ltd., Beijing, 100840, PR China.
The real-time detection of gaseous HO and its typical isotopic molecules, e.g., HO, DO, HDO, and HTO, is highly desirable in many fundamental scientific studies and practical monitoring, such as mechanistic studies of HO-involved chemical reactions and radiation risk warning of abnormal HTO emissions.
View Article and Find Full Text PDFClinical confocal laser endomicroscopy for imaging of autofluorescence signals of human brain tumors and non-tumor brain.
J Cancer Res Clin Oncol
December 2024
Department of Neurosurgery, Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany.
Purpose: Analysis of autofluorescence holds promise for brain tumor delineation and diagnosis. Therefore, we investigated the potential of a commercial confocal laser scanning endomicroscopy (CLE) system for clinical imaging of brain tumors.
Methods: A clinical CLE system with fiber probe and 488 nm laser excitation was used to acquire images of tissue autofluorescence.
[Tracing the Surface Water Pollution in a Chemical Park Based on the Fusion of Spectral and Chromatographic Characteristic Data].
Huan Jing Ke Xue
January 2025
Zhejiang Provincial Key Laboratory of Water Science and Technology, Department of Environment in Yangtze Delta Region Institute of Tsinghua University of Zhejiang, Jiaxing 314006, China.
Identification of the pollution source of surface water in a chemical park was difficult because many industrial enterprises with complex wastewater components and similar characteristics are located there. Therefore, a national-level chemical park in Jiaxing City was studied, and wastewater samples from ten batches of seven key enterprises in the park were collected and analyzed using 3D excitation emission matrix spectrometry （EEMS） and gas chromatography-mass spectrometry （GC-MS）. Parallel factor analysis was used to extract common components of EEMS spectra from different batches of drainage in the same enterprise to construct an EEMS characteristic data matrix.
View Article and Find Full Text PDFDevelopment of New Methods of Studying Catalyst and Materials Surfaces with Ambient Pressure Photoelectron Spectroscopy.
Acc Chem Res
December 2024
Department of Chemical and Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States.
ConspectusThe surface of a catalyst is crucial for understanding the mechanisms of catalytic reactions at the molecular level and developing new catalysts with higher activity, selectivity, and durability. Ambient pressure X-ray photoelectron spectroscopy (AP-XPS) is a technique studying the surface of a sample in the gas phase, mainly identifying chemical identity, analyzing oxidation state, and measuring surface composition.In the last decade, numerous photoelectron spectroscopic methods for fundamental studies of key topics in catalysis using AP-XPS have been developed.
View Article and Find Full Text PDFAuto-tuning of filtered proportional-integral-derivative controller for industrial processes under routine operating conditions.
ISA Trans
December 2024
Department of Automation, Xiamen University, Xiamen City 361000, China. Electronic address:
In general, auto-tuning implementation of PID controllers relies on dual controllers, exciting/identification experiments or some prior knowledge on the process and hence the considerable cost on auto-tuning implementation occurs. To deal with such a problem, a new auto-tuning scheme of the FPID controller is developed for minimum variance tasks under routine operating conditions in which the closed-loop system is running without any external excitation other than natural disturbances. This paper reveals that the stochastic disturbance model can be uniquely determined from the first several terms of the impulse response coefficients of the closed-loop system when the precondition on the time delay and the order of the disturbance model is satisfied.
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