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Xu, Hongtao,Wu, Changjin,Xiahou, Zhao,Jung, Ranju,Li, Ying,Liu, Chunli Springer US 2017 Nanoscale research letters Vol.12 No.1
<P>Five percent of Fe-doped ZnO (ZnO:Fe) thin films were deposited on Pt/TiO<SUB>2</SUB>/SiO<SUB>2</SUB>/Si substrates by a spin-coating method. The films were annealed without (ZnO:Fe-0T) and with a pulsed magnetic field of 4 T (ZnO:Fe-4TP) to investigate the magnetic annealing effect on the resistance switching (RS) behavior of the Pt/ZnO:Fe/Pt structures. Compared with the ZnO:Fe-0T film, the ZnO:Fe-4TP film showed improved RS performance regarding the stability of the set voltage and the resistance of the high resistance state. Transmission electron microscopy and X-ray photoelectron spectroscopy analyses revealed that the ZnO:Fe-4TP film contains more uniform grains and a higher density of oxygen vacancies, which promote the easier formation of conducting filaments along similar paths and the stability of switching parameters. These results suggest that external magnetic fields can be used to prepare magnetic oxide thin films with improved resistance switching performance for memory device applications.</P>
An Investigation on Selection Mechanisms for Mobile Camera-based Cursor Manipulation
Liang Chen,Dongyi Chen,Shiji Xiahou,Jie Li 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.3
To avoid the occlusion problem and the fat finger problem while manipulating mobile touch devices, researchers in HCI community have explored the area of mobile camera-based interaction which utilizes camera input instead of touch input. For mobile camera-based cursor manipulation, selection mechanisms may have an effect on users' pointing performance, and therefore worthy of study. In this research, we conducted a user study to explore how selection mechanisms influenced users' performance in mobile camera-based cursor manipulation and users' preferences. The quantitative results indicate that the users' performances of using two selection mechanisms (the button-based selection and tapping-based selection) are similar to each other from a statistical point of view. However, subjective feedback from the participants shows that the tapping-based selection is believed to be more comfortable and easy to use.
Effect of Co doping on unipolar resistance switching in Pt/Co:ZnO/Pt structures
Xu, H.,Kim, D.H.,Xiahou, Z.,Li, Y.,Zhu, M.,Lee, B.,Liu, C. Elsevier Sequoia 2016 JOURNAL OF ALLOYS AND COMPOUNDS Vol.658 No.-
Co-doped ZnO thin films were deposited on Pt/TiO<SUB>2</SUB>/SiO<SUB>2</SUB>/Si substrates by a spin-coating method. Co concentrations of 0, 1%, 3%, and 5% were used to investigate the effects of doping on the resistance switching (RS) behavior of these Pt/Co-doped ZnO/Pt structures. When compared with the other samples, the 1% Co-doped ZnO showed improved RS performance with regard to both the forming process and the stability of the set voltage. X-ray photoelectron spectroscopy analysis indicated that there were more oxygen vacancies in the 1% Co-doped ZnO, which promoted a lower forming voltage and the possibility of forming-free switching, and led to quite a narrow set voltage distribution. These results indicate that appropriate Co doping can be applied to improve the RS characteristics of ZnO thin films to provide stable, low-power-consumption memory devices.
The detection efficiency study of NaI(Tl) scintillation detector with the different numbers of SiPMs
Wang Bao,Zhang Xiongjie,Wang Qingshan,Wang Dongyang,Li Dong,Xiahou Mingdong,Zhou Pengfei,Ye Hao,Hu Bin,Zhang Lijiao 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.7
SiPMs are generally coupled into whole columns in gamma energy spectrum measurement, but the relationship between the distribution of whole SiPM columns and the energy resolution of the measured energy spectra is rarely reported. In this work, ∅ 3 3 inch NaI scintillator is placed on an 8 8 SiPM array, and the energy resolution of the 137Cs peak at 662 keV corresponding to the g-ray is selected as a reference. Each SiPM is switched to explore the influence of the number of SiPM arrays, distribution position, and reflective layer on the energy resolution of SiPMs. Results show that without coupling, the energy resolution is greatly improved when the number of SiPMs ranges from 4 to 32. However, after 32 slices (the area covered by SiPMs relative to the scintillator reaches 25.9%), the improvement in energy resolution and total pulse count is not obvious. In addition, the position of SiPMs relative to the scintillator does not exert much impact on the energy resolution. Results also indicate that by adding a reflective film (ESR), the energy resolution of the tested group increases by 10.38% on average. This work can provide a reference for the design and application of miniaturized SiPM gamma spectrometers
Huang Guangwei,Bao Hailong,Zhan Peng,Lu Xiyang,Duan Zonggang,Xiong Xinlin,Lin Muzhi,Wang Bing,An Hongxin,Xiahou Luanda,Zhou Haiyan,Luo Zhenhua,Li Wei 대한독성 유전단백체 학회 2024 Molecular & cellular toxicology Vol.20 No.2
Objectives This study aimed at investigating the role of the proprotein convertase subtilisin/Kexin type 9 (PCSK9)-mediated autophagy on myocardial ischemia/reperfusion injury (MIRI). To determine the relationship between autophagy, apoptosis, fibrosis, and inflammation in the myocardium, to provide experience in preventing and treating the myocardial ischemia/reperfusion (I/R) injury. Methods An AC16 hypoxia-reoxygenation model and a rat myocardial ischemia–reperfusion model were established. The concentrations of cardiac troponin T (cTnT) and creatine kinase-MB (CKMB) in plasma were measured by ELISA. To determine the size of the myocardial infarction, TTC/EB staining was performed. In addition to identifying pathological changes in myocardial tissue, Masson’s trichrome stains and H&E stains were used to identify pathological changes. Echocardiography was employed to detect cardiac function. Western blot analysis was then performed to detect the protein expression of Parkin, Pink1, and markers associated with autophagy (Beclin-1, p62, LC3). Results A significant increase in PCSK9 was observed in the myocardium during H/R. In the cardiac-specific PCSK9 knockdown model, cardiac autophagy was significantly inhibited, whereas cardiac-specific PCSK9 overexpression promoted cardiac autophagy. In vivo studies have demonstrated a significant decrease in cardiac autophagy when the PCSK9 inhibitor was administered. Apoptosis induced by I/R was greatly decreased, and myocardial infarction size and function were both improved by PCSK9 inhibitors. Mechanistically, the PCSK9 inhibitor improved the degree of myocardial fibrosis and inhibited the development of inflammation. Conclusions Our results demonstrated that increased PCSK9 via the parkin/pink1 signaling pathway contributes to I/R and H/R by exaggerating excessive autophagy during reperfusion/reoxygenation. In addition, the PCSK9 inhibitor blocked the development of inflammation and improved Infarct size, myocardial function, and myocardial fibrosis.