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Article ; Online: How to build an optical filter with an atomic vapor cell

Denis Uhland / Helena Dillmann / Yijun Wang / Ilja Gerhardt

New Journal of Physics, Vol 25, Iss 12, p

2023 Volume 125001

Abstract: The nature of atomic vapors, their natural alignment with interatomic transitions, and their ease of use make them highly suited for spectrally narrow-banded optical filters. Atomic filters come in two flavors: a filter based on the absorption of light ... ...

Abstract	The nature of atomic vapors, their natural alignment with interatomic transitions, and their ease of use make them highly suited for spectrally narrow-banded optical filters. Atomic filters come in two flavors: a filter based on the absorption of light by the Doppler broadened atomic vapor, i.e. a notch filter, and a bandpass filter based on the transmission of resonant light caused by the Faraday effect. The notch filter uses the absorption of resonant photons to filter out a small spectral band around the atomic transition. The off-resonant part of the spectrum is fully transmitted. Atomic vapors based on the Faraday effect allow for suppression of the detuned spectral fraction. Transmission of light originates from the magnetically induced rotation of linear polarized light close to an atomic resonance. This filter constellation allows selective acceptance of specific light frequencies. In this manuscript, we discuss these two types of filters and elucidate the specialties of atomic line filters. We also present a practical guide on building such filter setups from scratch and discuss an approach to achieve an almost perfect atomic spectrum backed by theoretical calculations.
Keywords	atomic vapors ; Faraday filters ; spectroscopy ; Science ; Q ; Physics ; QC1-999
Subject code	535
Language	English
Publishing date	2023-01-01T00:00:00Z
Publisher	IOP Publishing
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Quantile estimation of semiparametric model with time-varying coefficients for panel count data.

Yijun Wang / Weiwei Wang

PLoS ONE, Vol 16, Iss 12, p e

2021 Volume 0261224

Abstract: Panel count data frequently occurs in follow-up studies, such as medical research, social sciences, reliability studies, and tumorigenicity experiences. This type data has been extensively studied by various statistical models with time-invariant ... ...

Abstract	Panel count data frequently occurs in follow-up studies, such as medical research, social sciences, reliability studies, and tumorigenicity experiences. This type data has been extensively studied by various statistical models with time-invariant regression coefficients. However, the assumption of invariant coefficients may be violated in some reality, and the temporal covariate effects would be of great interest in research studies. This motivates us to consider a more flexible time-varying coefficient model. For statistical inference of the unknown functions, the quantile regression approach based on the B-spline approximation is developed. Asymptotic results on the convergence of the estimators are provided. Some simulation studies are presented to assess the finite-sample performance of the estimators. Finally, two applications of bladder cancer data and US flight delay data are analyzed by the proposed method.
Keywords	Medicine ; R ; Science ; Q
Subject code	310
Language	English
Publishing date	2021-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: eldBETA

Bingchuan Liu / Yijun Wang / Xiaorong Gao / Xiaogang Chen

Scientific Data, Vol 9, Iss 1, Pp 1-

A Large Eldercare-oriented Benchmark Database of SSVEP-BCI for the Aging Population

2022 Volume 12

Abstract: Measurement(s) Steady-state visual evoked potential (SSVEP) Technology Type(s) Electroencephalography (EEG) Factor Type(s) Elder population Sample Characteristic - Organism Homo sapiens Sample Characteristic - Environment Electromagnetic shielding ... ...

Abstract	Measurement(s) Steady-state visual evoked potential (SSVEP) Technology Type(s) Electroencephalography (EEG) Factor Type(s) Elder population Sample Characteristic - Organism Homo sapiens Sample Characteristic - Environment Electromagnetic shielding room
Keywords	Science ; Q
Language	English
Publishing date	2022-05-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Improving the performance of ghost imaging via measurement-driven framework

Hanqiu Kang / Yijun Wang / Ling Zhang / Duan Huang

Scientific Reports, Vol 11, Iss 1, Pp 1-

2021 Volume 10

Abstract: Abstract High-quality reconstruction under a low sampling rate is very important for ghost imaging. How to obtain perfect imaging results from the low sampling rate has become a research hotspot in ghost imaging. In this paper, inspired by matrix ... ...

Abstract	Abstract High-quality reconstruction under a low sampling rate is very important for ghost imaging. How to obtain perfect imaging results from the low sampling rate has become a research hotspot in ghost imaging. In this paper, inspired by matrix optimization in compressed sensing, an optimization scheme of speckle patterns via measurement-driven framework is introduced to improve the reconstruction quality of ghost imaging. According to this framework, the sampling matrix and sparse basis are optimized alternately using the sparse coefficient matrix obtained from the low-dimension pseudo-measurement process and the corresponding solution is obtained analytically, respectively. The optimized sampling matrix is then dealt with non-negative constraint and binary quantization. Compared to the developed optimization schemes of speckle patterns, simulation results show that the proposed scheme can achieve better reconstruction quality with the low sampling rate in terms of peak signal-to-noise ratio (PSNR) and mean structural similarity index (MSSIM). In particular, the lowest sampling rate we use to achieve a good performance is about 6.5%. At this sampling rate, the MSSIM and PSNR of the proposed scheme can reach 0.787 and 17.078 dB, respectively.
Keywords	Medicine ; R ; Science ; Q
Subject code	518
Language	English
Publishing date	2021-03-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: A Facile Method to Fabricate Al 2 O 3 -SiO 2 Aerogels with Low Shrinkage up to 1200 °C

Yulin Tian / Xiaodong Wang / Yu Wu / Xiaoxue Zhang / Chun Li / Yijun Wang / Jun Shen

Molecules, Vol 28, Iss 2743, p

2023 Volume 2743

Abstract: Monolithic Al 2 O 3 -SiO 2 composite aerogels were synthesized by using inexpensive aluminum chloride hexahydrate (AlCl 3 ·6H 2 O) and tetraethyl orthosilicate (TEOS). By adjusting the molar ratio of Al and Si, the best ratio of high-temperature ... ...

Abstract	Monolithic Al 2 O 3 -SiO 2 composite aerogels were synthesized by using inexpensive aluminum chloride hexahydrate (AlCl 3 ·6H 2 O) and tetraethyl orthosilicate (TEOS). By adjusting the molar ratio of Al and Si, the best ratio of high-temperature resistance was found. The resultant aerogels (Al:Si = 9:1) exhibit high thermal performance, which can be identified by the low linear shrinkage of 5% and high specific surface area (SSA) of 283 m 2 /g at 1200 °C. Alumina in these aerogels mainly exists in the boehmite phase and gradually transforms into the θ-Al 2 O 3 phase in the process of heating to 1200 °C. No α-Al 2 O 3 is detected in the heating process. These Al 2 O 3 -SiO 2 composite aerogels are derived from a simple, low-priced and safe method. With their high thermal performance, these aerogels will have a wide application in high-temperature field.
Keywords	Al 2 O 3 -SiO 2 composite aerogels ; high-temperature performance ; high specific surface area ; Organic chemistry ; QD241-441
Language	English
Publishing date	2023-03-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Hepatitis B immunization status and risk factors of people aged 1 to 69 in Huangpu District, Shanghai, China

Yijun Wang / Min Shu / Jun Chen / Fujie Shen / Hong Ren / Yongfu Yu

Frontiers in Public Health, Vol

2023 Volume 11

Abstract: BackgroundChina has long been with high Hepatitis B Virus(HBV) prevalence in the world. The HBV prevalence of people aged 1–59 decreased to less than 8% in 2006, and by 2020, HBsAg positive rate of children aged <5 decreased to less than <1% which was ... ...

Abstract	BackgroundChina has long been with high Hepatitis B Virus(HBV) prevalence in the world. The HBV prevalence of people aged 1–59 decreased to less than 8% in 2006, and by 2020, HBsAg positive rate of children aged <5 decreased to less than <1% which was due to the free three-dose hepatitis B(HepB) immunization for newborns nationwide since 2002. Huangpu district was selected as one of the pilot areas for free Hep B vaccination in newborns since 1986, which formed an early protection in the population from mother-to-child transmission. However, the existed HBV infected people were still needed to be discovered, evaluated whether to receive antiviral therapies and intervened with health education in order to reduce the incidence of viral hepatitis related hepatocellular carcinoma (HCC) and also reach the goal to eliminate public health hazards of viral hepatitis by 2030.ObjectiveTo know HepB immunization status among people aged 1 to 69 in Huangpu district of Shanghai, and find out risk factors changes of HBV infection.MethodsCross-sectional study was applied to analyze the HepB immunization status and related risk factors by carrying out survey among 706 participants aged 1 to 69 years old. Blood samples were collected for detection of serological HBV markers including hepatitis B surface antigen(HBsAg), hepatitis B surface antibody(HBsAb) and hepatitis B core antibody(HBcAb). Participants with HBsAg positive were required to complete additional examinations such as alanine aminotransferase(ALT), aspartate aminotransferase(AST), total bilirubin, albumin, globulin, liver fibroscan and liver ultrasound.ResultsFor participants aged 1 to 14, the positive rate of HBsAg, HBsAb and HBcAb was 0.00, 50.00 and 30.46%, respectively. The HBsAb positive rate reached a peak of 90.91% at 2 years old, and then showed a significant downward trend (χ2 = 55.612, p < 0.001). All the participants have completed three-dose Hep B vaccination, however for the second dose, those who vaccinated 30 days later than the appointed ...
Keywords	hepatitis B ; immunization ; HBsAb ; HBcAb ; HBsAg ; multivariate analysis ; Public aspects of medicine ; RA1-1270
Subject code	630
Language	English
Publishing date	2023-12-01T00:00:00Z
Publisher	Frontiers Media S.A.
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Neural Network-Based Prediction for Secret Key Rate of Underwater Continuous-Variable Quantum Key Distribution through a Seawater Channel

Yun Mao / Yiwu Zhu / Hui Hu / Gaofeng Luo / Jinguang Wang / Yijun Wang / Ying Guo

Entropy, Vol 25, Iss 937, p

2023 Volume 937

Abstract: Continuous-variable quantum key distribution (CVQKD) plays an important role in quantum communications, because of its compatible setup for optical implementation with low cost. For this paper, we considered a neural network approach to predicting the ... ...

Abstract	Continuous-variable quantum key distribution (CVQKD) plays an important role in quantum communications, because of its compatible setup for optical implementation with low cost. For this paper, we considered a neural network approach to predicting the secret key rate of CVQKD with discrete modulation (DM) through an underwater channel. A long-short-term-memory-(LSTM)-based neural network (NN) model was employed, in order to demonstrate performance improvement when taking into account the secret key rate. The numerical simulations showed that the lower bound of the secret key rate could be achieved for a finite-size analysis, where the LSTM-based neural network (NN) was much better than that of the backward-propagation-(BP)-based neural network (NN). This approach helped to realize the fast derivation of the secret key rate of CVQKD through an underwater channel, indicating that it can be used for improving performance in practical quantum communications.
Keywords	continuous-variable ; quantum key distribution ; neural network ; underwater channel ; Science ; Q ; Astrophysics ; QB460-466 ; Physics ; QC1-999
Subject code	003
Language	English
Publishing date	2023-06-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Tocilizumab

Danfei Liu / Tongyue Zhang / Yijun Wang / Limin Xia

Frontiers in Medicine, Vol

The Key to Stop Coronavirus Disease 2019 (COVID-19)-Induced Cytokine Release Syndrome (CRS)?

2020 Volume 7

Abstract: The COVID-19 disease is an unprecedented international public health emergency and considerably impacts the global economy and health service system. While awaiting the development of an effective vaccine, searching for the therapy for severe or critical ...

Abstract	The COVID-19 disease is an unprecedented international public health emergency and considerably impacts the global economy and health service system. While awaiting the development of an effective vaccine, searching for the therapy for severe or critical COVID-19 patients is essential for reducing the mortality and alleviating the tension of the health service system. Cytokine release syndrome (CRS) induced by elevated interleukin-6 was recognized to underscore the pathology of severe COVID-19 patients. Inhibiting CRS by agents suppressing IL-6 may relieve symptoms, shorten the hospital stay and reduce the need for oxygen therapy. Although evidence from randomized, double-blinded clinical trials is still lacking, the IL-6R inhibitor tocilizumab (TCZ) has shown some clinical benefits in the treatment of severe COVID-19 patients and have been included in clinical guidelines. In this review, we focused on the possible mechanisms of TCZ in the treatment of CRS and highlighted some significant considerations in the use of TCZ to treat COVID-19 patients.
Keywords	COVID-19 ; cytokine release syndrome ; interleukin-6 ; tocilizumab ; SARS-CoV-2 ; Medicine (General) ; R5-920
Subject code	610
Language	English
Publishing date	2020-10-01T00:00:00Z
Publisher	Frontiers Media S.A.
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: RETRACTED

Li Zhang / Miao Hu / Yuan Chen / Yijun Wang

Journal of International Medical Research, Vol

Effects of atorvastatin and ticagrelor combination therapy on renal function and the levels of suppression of tumorigenicity 2 and interleukin-33 in patients with ST-segment elevation myocardial infarction

2020 Volume 48

Keywords	Medicine (General) ; R5-920
Language	English
Publishing date	2020-12-01T00:00:00Z
Publisher	SAGE Publishing
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Analysis of occupational identity among family doctor teams and its influencing factors in Chengdu

Jinhua CHEN / Mingfeng ZHANG / Yijun WANG / Wen DU / Zhu XIAO / Yuelei WU / Shuyi LIU

环境与职业医学, Vol 39, Iss 12, Pp 1373-

2022 Volume 1378

Abstract: BackgroundThe contracted family doctor services are the embodiment of the implementation of the new medical reform policy, and the transformation of the grass-roots health service mode. Studies have proved that the occupational stress in medical staff ... ...

Abstract	BackgroundThe contracted family doctor services are the embodiment of the implementation of the new medical reform policy, and the transformation of the grass-roots health service mode. Studies have proved that the occupational stress in medical staff was at a high level. The enhancement of professional identity will contribute to strengthen team building，alleviate job burnout, and reduce turnover intention of family doctors. ObjectiveTo investigate the current situation of occupational identity among family doctor teams in Chengdu, to examine potential influencing factors of occupational identity, and to provide a reference for promoting career development and team building of family doctor teams. MethodsMulti-stage random cluster sampling was adopted to enroll study participants form 46 primary healthcare centers where family doctor contract services were implemented among 23 districts and counties in Chengdu between March 4 and 26, 2021. A total of 2 681 family doctors participated in this survey. A self-reported survey was conducted to collect participants' demographic and occupational data. The Effort-Reward Imbalance (ERI）questionnaire was implemented to assess occupational stress. The Professional Identity Scale was used to appraise occupational identity. ResultsA total of 2 327 valid questionnaires were collected, with a valid recovery rate of 86.80%, involving 1 715 females (73.7%) and 612 males (26.3%), with dominant age groups of 26−35 years (43.3%) and 36−45 years (30.4%), a high proportion of being married (82.8%), having college (36.0%) and undergraduate (47.3%) education, a high proportion of primary titles (66.0%) and informal work contract (66.1%). About 88.7% of family doctor team workers reported occupational stress. The average score of occupational identity was (3.68±0.62) points. There were significant differences in occupational identity scores among different professional title, work contract, working years in medical institutions, income, and effort/reward ratio (EER) groups (P < ...
Keywords	family doctor ; medical staff ; effort-reward imbalance ; occupational stress ; occupational identity ; Medicine (General) ; R5-920 ; Toxicology. Poisons ; RA1190-1270
Subject code	796
Language	English
Publishing date	2022-12-01T00:00:00Z
Publisher	Editorial Committee of Journal of Environmental and Occupational Medicine
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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