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Method of composing two-dimensional scanned spectra observed by the New Vacuum Solar Telescope

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Research in Astronomy and Astrophysics 2018年第4期18卷 59-68页

作者： yun-Fang Cai Zhi Xu yu-chao chen Jun Xu Zheng-Gang Li yu Fu Kai-Fan Ji yunnan Observatories Chinese Academy of Sciences Kunming 650011 China University of Chinese Academy of Sciences Beijing 100049 China

In this paper we illustrate the technique used by the New Vacuum Solar Telescope（NVST）to increase the spatial resolution of two-dimensional（2D）solar spectroscopy observations involving two dimensions of space and one of *** an image stabilizer at the NVST,large scale wobble motion is present during the spatial scanning,whose instantaneous amplitude can reach 1.3′′due to the Earth’s atmosphere and the precision of the telescope guiding system,and seriously decreases the spatial resolution of 2D spatial maps composed with scanned *** make the following effort to resolve this problem：the imaging system（e.g.,the Ti O-band）is used to record and detect the displacement vectors of solar image motion during the raster scan,in both the slit and scanning *** spectral data（e.g.,the Hαline）which are originally obtained in time sequence are corrected and re-arranged in space according to those displacement *** scans are carried out in several active regions with different seeing conditions（two rasters are illustrated in this paper）.Given a certain spatial sampling and temporal resolution,the spatial resolution of the composed 2D map could be close to that of the slit-jaw *** resulting quality after correction is quantitatively evaluated with two methods.A physical quantity,such as the line-of-sight velocities in multiple layers of the solar atmosphere,is also inferred from the re-arranged spectrum,demonstrating the advantage of this technique.

关键词： instrumentation spectrographs — Sun sunspots — techniques imaging spectroscopy — techniques image processing

A direct coupling analysis method and its application to the Scientific Research and Demonstration Platform

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Journal of Hydrodynamics 2021年第1期33卷 13-23页

作者： Jun Ding You-sheng Wu Xin-yun Ni Qi-bin Wang yu-chao chen Yong-lin Ye Xin-yu Zhang yu-xiang Ma Wei-nan Yang China Ship Scientific Research Center Wuxi 214082China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China

Design of a very large floating structure(VLFS)deployed near islands and reefs,different from those in the open sea,inevitably faces new technical challenges including numerical analysis *** this paper,a direct coupling analysis method(DCAM)has been established based on the Boussinesq equations and the three-dimensional hydroelasisity theory with Rankine source method to analyze the responses of a VLFS in shallow sea with complicated geographical *** tests have been carried out to validate the *** further verify the numerical methods and investigate the performance of such a VLFS,a“Scientific Research and Demonstration Platform(SRDP)”was built and deployed in 2019 at the site about 1000 m off an island with water depth around 40m in South China *** is a simplified small model of a two-module semi-submersible-type *** numerical simulation of its responses on severe waves with focus on motions and connector forces is conduct by DCAM,and compared with the on-site *** agreement has been *** approves the DCAM as a feasible tool for design and safety assessment of a VLFS deployed near islands and reefs.

关键词： Very large floating structure(VLFS) hydroelastic analysis near island direct coupling analysis method model test on-site measurement verification

Risk of critical limb ischemia in long-term uterine cancer survivors:A population-based study

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World Journal of Clinical Cases 2022年第36期10卷 13293-13303页

作者： Min-Chi chen Jung-Jung Chang Miao-Fen chen Ting-Yao Wang Cih-En Huang Kuan-Der Lee chao-yu chen Department of Public Health Chang Gung UniversityTaoyuan 333Taiwan Department of Obstetrics and Gynecology Chang Gung Memorial HospitalChiayi 612Taiwan Division of Cardiovascular Disease Department of Internal MedicineChang Gung Memorial HospitalChiayi 612Taiwan Department of Radiation Oncology Change Gung Memorial HospitalLinkouTaoyuan 333Taiwan Division of Hematology and Oncology Department of Internal MedicineChang Gung Memorial HospitalChiayi 612Taiwan Graduate Institute of Clinical Medical Sciences College of MedicineChang Gung UniversityTaoyuan 333Taiwan Department of Medicine Taipei Medical University HospitalTaipei 100Taiwan Department of Medical Research Taichung Veterans General HospitalTaichung 407Taiwan Department of Post-Baccalaureate Medicine College of MedicineNational Chung Hsing UniversityTaichung 402Taiwan Department of Early Childhood Care and Education Shu-Zen Junior College of Medicine and ManagementKaohsiung 821Taiwan

BACKGROUND The risk of critical limb ischemia(CLI)which causes ischemic pain or ischemic loss in the arteries of the lower extremities in long-term uterine cancer(UC)survivors remains unclear,especially in Asian patients,who are younger at the diagnosis of UC than their Western *** To conduct a nationwide population-based study to assess the risk of CLI in UC long-term *** UC survivors,defined as those who survived for longer than 5 years after the diagnosis,were identified and matched at a 1:4 ratio with normal *** Cox models were used to assess the risk of *** From 2000 to 2005,1889 UC survivors who received surgery alone or surgery combined with radiotherapy(RT)were classified into younger(onset age65 years,aHR=2.48,P=0.011),had hypertension(aHR=2.18,P=0.008)or received HRT(aHR=3.52,P=0.020)were at a higher risk of *** In this nationwide study,we found that the risk factors associated with CLI were similar in both cohorts except for adjuvant RT that was negligible in the younger group,but positive in the older *** the survivors,hypertension,advanced age,and HRT were more hazardous than *** prevention should include CLI as a late complication in UC survivorship programs.

关键词： Uterine cancer Critical limb ischemia Radiotherapy Survivorship

A De novo Mutation in Dystrophin Causing Muscular Dystrophy in a Female Patient

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Chinese Medical Journal 2017年第19期130卷 2273-2278页

作者： Hao yu yu-chao chen Gong-Lu Liu Zhi-Ying Wu Department of Neurology and Research Center of Neurology Second Affiliated Hospital Zhejiang University School of Medicine Hangzhou Zhejiang 310009 China Department of Neurology and Institute of Neurology First Affiliated Hospital Fuiian Medical University Fuzhou Fujian 350004 China

Background： Duchenne muscular dystrophy （DMD） and Becker muscular dystrophy （BMD） are X-linked recessive neuromuscular diseases resulting from dystrophin （DMD） gene mutations. It has been known that the carrier of DMD mutations may also have symptoms of the disease. While de novo mutation is quite common in BMD/DMD patients, it is rarely reported in the female carriers. Methods： Two sporadic Chinese patients with progressive muscular dystrophy and their familial members were recruited. The targeted next-generation sequencing （NGS） and the multiplex ligation-dependent probe analysis （MLPA） were performed in the proband. Blood tests, electrocardiography, echocardiography, and electromyography were also evaluated. Results： Two novel mutations of DMD gene were identified, c.7318C〉T（p.Q2440＊） in the male proband and c.4983dupA（p.A1662Sfs＊24） in the female carrier. The MLPA analysis did not detect any large rearrangements. The haplotype analysis indicated that the two mutations were derived from de novo mutagenesis. Conclusions： We identified two novel de novo mutations of DMD gene in two Chinese pedigrees, one of which caused a female patient with muscular dystrophy. The mutational analysis is important for DMD patients and carriers in the absence of a family history. The NGS can help detect the mutations in MLPA-negative patients.

关键词： Carrier De novo Duchenne Muscular Dystrophy Dystrophin

Spectro-polarimetric observations at the NVST:*** polarization calibration and primary measurements

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Research in Astronomy and Astrophysics 2020年第4期20卷 7-18页

作者： Jun-Feng Hou Zhi Xu Shu yuan yu-chao chen Jian-Guo Peng Dong-Guang Wang Jun Xu yuan-Yong Deng Zhen-yu Jin Kai-Fan Ji Zhong Liu National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China yunnan Observatories Chinese Academy of SciencesKunming 650216China

This paper is devoted to the primary spectro-polarimetric observation performed at the New Vacuum Solar Telescope(NVST)of China since 2017,and our aim is to precisely evaluate the real polarimetric accuracy and sensitivity of this polarimetry by using full Stokes spectro-polarimetric observations of the photospheric line Fe I 532.4 *** the work,we briefly describe the salient characteristic of the NVST as a polarimeter in terms of technology and then characterize its instrumental polarization based on the operation in 2017 and *** is verified that the calibration method utilizing the instrumental polarization calibration unit(ICU)is stable and *** calibration accuracy can reach up to 3×10^-*** on the scientific observation of NOAA Active Region 12645 on 2017 April 5,we estimate that the residual cross-talk from Stokes I to Stokes Q,U and V,after the instrumental polarization calibration,is about 4×10^-3 on average,which is consistent with the calibration accuracy and close to the photon *** polarimetric sensitivity(i.e.,the detection limit)for polarized light is of the order of 10-3 with an integration time over 20 *** modulation rate is indeed an issue for the present *** present NVST polarimeter is expected to be integrated with a high-order adaptive optics system and a field scanner to realize 2 D vector magnetic field measurements in the following instrumentation update.

关键词： techniques:polarimetric techniques:spectroscopic Sun:magnetic fields

Effect of particle shape on packing fraction and velocity profiles at outlet of a silo

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Chinese Physics B 2023年第6期32卷 368-377页

作者：高庆庆陈玉超胡林 College of Physics Guizhou UniversityGuiyang 550025China Department of Civil Engineering Nanyang Normal UniversityNanyang 473061China

Many studies on how the particle shape affects the discharge flow mainly focus on discharge rates and avalanche statistics. In this study, the effect of the particle shape on the packing fraction and velocities of particles in the silo discharge flow are investigated by using the discrete element method. The time-averaged packing fraction and velocity profiles through the aperture are systematically measured for superelliptical particles with different blockinesses. Increasing the particle blockiness is found to increase resistance to flow and reduce the flow rate. At an identical outlet size, larger particle blockiness leads to lower velocity and packing fraction at the outlet. The packing fraction profiles display evidently the self-similar feature that can be appropriately adjusted by fractional power law. The velocity profiles for particles with different shapes obey a uniform self-similar law that is in accord with previous experimental results, which is compatible with the hypothesis of free fall arch. To further investigate the origin of flow behaviors, the packing fraction and velocity field in the region above the orifice are computed. Based on these observations, the flow rate of superelliptical particles is calculated and in agreement with the simulated data.

关键词： superelliptical particles flow rate packing fraction and velocity profiles discrete element method

Advance in reversible Zn anodes promoted by 2D materials

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Rare Metals 2024年第4期43卷 1350-1369页

作者： Shu-yuan Lei Jin-Xiu Feng yu-chao chen Dong Zheng Wen-Xian Liu Wen-Hui Shi Fang-Fang Wu Xie-Hong Cao School of Materials Science and Engineering Zhejiang University of TechnologyHangzhou310014China Center for Membrane Separation and Water Science and Technology College of Chemical EngineeringZhejiang University of TechnologyHangzhou310014China

With the growing energy demand associated with high safety and low-cost requirement,aqueous zinc-ion batteries(AZIBs)have been considered as one of the most promising next-generation ***,some key issues,such as uncontrollable dendrites growth,severe corrosion,hydrogen evolution and side reactions of Zn anodes during charge/discharge process,have hindered its pragmatic ***-dimensional(2D)materials hold advantages of unique physical and chemical properties,large surface areas and abundant active sites,which have been successfully used to overcome the above shortcomings of Zn anodes in recent *** this review,the issues and challenges of Zn anodes are ***,the state-of-the-art progress on Zn anodes modification based on 2D materials such as graphene,2D metal carbides and nitrides(MXenes),2D metal-organic frameworks(MOFs),2D covalent organic frameworks(COFs),2D transition metal compounds and other 2D materials is discussed in ***,the perspectives of employing 2D materials in highly reversible Zn anodes are summarized and discussed.

关键词： 2D materials Aqueous zinc-ion battery Zn anodes Dendrites growth

Identifying survival protective factors for chronic dialysis patients with surgically confirmed acute mesenteric ischemia

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World Journal of Gastrointestinal Surgery 2022年第8期14卷 809-820页

作者： Shuh-Kuan Liau George Kuo chao-yu chen yueh-An Lu yu-Jr Lin cheng-Chia Lee cheng-Chieh Hung Ya-Chung Tian Hsiang-Hao Hsu Department of Nephrology Kidney Research CenterChang Gung Memorial HospitalLinkou BranchCollege of MedicineChang Gung UniversityTaoyuan 333Taiwan Research Services Center for Health Information Chang Gung UniversityTaoyuan 333Taiwan

BACKGROUND Mesenteric ischemia is significantly more common in end-stage kidney disease patients undergoing chronic dialysis than in the general population and is associated with high morbidity and mortality. However, reports on prognostic factors in this population are *** To elucidate the in-hospital outcomes of acute mesenteric ischemia in chronic dialysis patients and to analyze protective factors for *** The case data of 426 chronic dialysis patients who were hospitalized in a tertiary medical center for acute mesenteric ischemia over a 14-year period were retrospectively reviewed. Of these cases, 103 were surgically confirmed, and the patients were enrolled in this study. A Cox regression analysis was used to evaluate the protective factors for *** The in-hospital mortality rate among the 103 enrolled patients was 46.6%.Univariate analysis was performed to compare factors in survivors and nonsurvivors, with better in-hospital outcomes associated with a surgery delay(defined as the time from onset of signs and symptoms to operation) < 4.5 d, no shock, a higher potassium level on day 1 of hospitalization, no resection of the colon, and a total bowel resection length < 110 cm. After 1 wk of hospitalization, patients with lower white blood cell count and neutrophil counts, higher lymphocyte counts, and lower C-reactive protein levels had better in-hospital outcomes. Following multivariate adjustment, a higher potassium level on day 1 of hospitalization(HR 1.71, 95%CI 1.19 to 2.46;P = 0.004), a lower neutrophil count(HR 0.91, 95%CI 0.84 to 0.99;P = 0.037) at 1 wk after admission, resection not involving the colon(HR 2.70, 95%CI 1.05 to 7.14;P = 0.039), and a total bowel resection length < 110 cm(HR 4.55,95%CI 1.43 to 14.29;P = 0.010) were significantly associated with *** A surgery delay < 4.5 d, no shock, no resection of the colon, and a total bowel resection length <110 cm predicted better outcomes in chronic dial

关键词： Mesenteric ischemia Chronic dialysis End-stage kidney disease Surgery Protective factors Survival

Mechanistic insight into the synergy between nickel single atoms and nanoparticles on N-doped carbon for electroreduction of CO2

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Journal of Energy Chemistry 2025年第1期100卷 327-336页

作者： Mingdong Sun Wenwen Guan Cailing chen chao Wu Xiaoling Liu Biao Meng Tao chen yu Han Jun Wang Shibo Xi yu Zhou State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Advanced Membranes and Porous Materials Center Physical Sciences and Engineering Division King Abdullah University of Science and Technology Institute of Sustainability for Chemicals Energy and Environment A*STAR (Agency for Science Technology and Research) College of Materials Science and Engineering Sichuan University

The synergy of single atoms （SAs） and nanoparticles （NPs） has demonstrated great potential in promoting the electrocatalytic carbon dioxide reduction reaction （CO2RR）;however,the rationalization of the SAs/NPs proportion remains one challenge for the catalyst ***,a Ni2+-loaded porous poly（ionic liquids）(PIL) precursor synthesized through the free radical self-polymerization of the ionic liquid monomer,1-allyl-3-vinylimidazolium chloride,was pyrolyzed to prepare the Ni,N co-doped carbon materials,in which the proportion of Ni SAs and NPs could be facilely modulated by controlling the annealing *** catalyst Ni-NC-1000 with a moderate proportion of Ni SAs and NPs exhibited high efficiency in the electrocatalytic conversion of CO2into *** Ni K-edge X-ray absorption near-edge structure （XANES） spectra and theoretical calculations were conducted to gain insight into the synergy of Ni SAs and *** charge transfer from Ni NPs to the surrounding carbon layer and then to the Ni SAs resulted in the electron-enriched Ni SAs active *** the electroreduction of CO2,the coexistence of Ni SAs and NPs strengthened the CO2activation and the affinity towards the key intermediate of*COOH,lowering the free energy for the potential-determining*CO2→*COOH step,and therefore promoted the catalysis efficiency.

关键词： Single atom catalyst Synergy effect Carbon catalyst Electrocatalysis