Results 1 to 10 of about 28,422,071 (389)

Drawing Tower In-Line Fabrication and the Spectrum Analysis of Sampled Fiber Grating [PDF]

Photonic Sensors, 2019
Sampled fiber grating is a special superstructure fiber Bragg grating with a wide range of applications in many fields. In this work, based on drawing tower in-line fabrication system, a new preparation method of the sampled fiber grating is proposed and
Yu Zheng, Wenjing Gao, Haihu Yu, Huiyong Guo, Shan Jiang, Desheng Jiang   +5 more
doaj   +2 more sources

Temporal Flow Characteristics of Three-Dimensional Centrifugal Impeller Suction System at Vacuum Conditions [PDF]

Journal of Applied Fluid Mechanics, 2023
Temporal flow characteristics of a 3D centrifugal impeller suction system were numerically studied in vacuum conditions. The blockage of the high-speed rotating impeller appeared, which greatly dropped the suction of the layer suction device.
Y. Li, B. Zhang, Y. Chen, Z. Wang, H. Yang, Y. Wei   +5 more
doaj   +1 more source

Smoking, distress and COVID-19 in England: Cross-sectional population surveys from 2016 to 2020

Preventive Medicine Reports, 2021
Changes in the prevalence of psychological distress among smokers during the COVID-19 pandemic in England may exacerbate existing health inequalities. This study examined the prevalence of psychological distress among smokers following the onset of the ...
Loren Kock, Jamie Brown, Lion Shahab, Graham Moore, Marie Horton, Leonie Brose   +5 more
doaj   +1 more source

Sound Level Measurement and Spectrum Analysis in Full and Empty Various Social Spaces

Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2021
The noise seen in different areas throughout human history has turned into a frequently complained problem with the increasing industry and technology. Unfortunately, the problem of noise has become a part of social life today.
Serden Başak, Kazım Onur Demirarslan
doaj   +1 more source

500-year growth cycle of stalagmite and its response to regional hydrological changes in Heshang cave, western Hubei

地质科技通报, 2022
Stalagmitesare important high-resolution paleoclimate archives, and possess abundant physical, chemical and microbial paleoclimate proxies. Among of them, the growth rate (GR)of stalagmites quite popular because its easy access and non-destruction ...
Cuizhen Zhang, Zongmin Zhu, Jianyu Ding, Taiheng Shi   +3 more
doaj   +1 more source

Fault Diagnosis Scheme for Open-Circuit Fault in N+2 Converter of Six-Phase SRM Using Midpoint Current Spectrum Analysis

IEEE Access, 2022
In this paper, a six-phase $\text{N}+2$ power converter for switched reluctance motor is studied. An open-circuit fault diagnosis and faulty devices location scheme based on midpoint current spectrum analysis is proposed.
Minjun Guan, Chuang Liu, Peilin Liu, Xiaodong Sun   +3 more
doaj   +1 more source

Does immediate smart feedback on therapy adherence and inhalation technique improve asthma control in children with uncontrolled asthma? A study protocol of the IMAGINE I study

Trials, 2020
Background Many asthmatic children suffer from uncontrolled asthma with frequent exacerbations, despite an optimal treatment plan using inhalation medication.
Esther T. Sportel, Martijn J. Oude Wolcherink, Job van der Palen, Anke Lenferink, Boony J. Thio, Kris L. L. Movig, Marjolein G. J. Brusse-Keizer   +6 more
doaj   +1 more source

Can Pediatricians Assess Exercise-Induced Bronchoconstriction From Post-exercise Videos?

Frontiers in Pediatrics, 2020
Objective: Exercise-induced bronchoconstriction (EIB) is a highly prevalent morbidity of childhood asthma and defined by a transient narrowing of the airways during or after physical exercise.
N. Lammers, M. H. T. van Hoesel, M. G. J. Brusse-Keizer, J. van der Palen, J. van der Palen, R. Spenkelink-Visser, J. M. M. Driessen, J. M. M. Driessen, B. J. Thio   +8 more
doaj   +1 more source

Spectrum Analysis Enabled Periodic Feature Reconstruction Based Automatic Defect Detection System for Electroluminescence Images of Photovoltaic Modules

Micromachines, 2022
Electroluminescence (EL) imaging is a widely adopted method in quality assurance of the photovoltaic (PV) manufacturing industry. With the growing demand for high-quality PV products, automatic inspection methods based on machine vision have become an ...
Jiachuan Yu, Yuan Yang, Hui Zhang, Han Sun, Zhisheng Zhang, Zhijie Xia, Jianxiong Zhu, Min Dai, Haiying Wen   +8 more
doaj   +1 more source

Spectrum Analysis of Contact Network for Public Policy in a Pandemic

IEEE Access, 2022
In a pandemic, in order to slow down the spread of the virus, protect national health, and maintain the normal operation of economic activities, countries around the world will formulate public policies to limit the number of citizens that can gather ...
Qi Xu
doaj   +1 more source