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| 1 | Efficient generation of hepatocyte-like cells from human induced pluripotent stem cells显示文摘人的导致的 pluripotent 茎(iPS ) 房间类似于胚胎的茎(ES ) 房间,和罐头强烈地增殖并且区分进许多房间类型。然而,人的 iPS 房间的肝的区别还没被报导了。在这份报告,人的 iPS 房间被导致由一个逐步的协议区分进肝的房间。肝房间标记的表达式和人的 iPS 的肝相关的函数导出房间的房间被监视并且与区分的人的 ES 房间和主要人的 hepatocytes 的相比。在白天 7 点的约 60% 区分的人的 iPS 房间表示了肝的标记 alpha fetoprotein 和白长袍的。在白天 21 点的区分的房间包括白朊 Asecretion,肝糖合成,脲生产和可诱导的细胞色素 P450 活动展出了肝房间功能。肝的标记的表示和 iPS 的肝相关的功能导出房间的肝的房间比得上人的 ES 导出房间的肝的房间的。这些结果证明人的 iPS 房间,类似于人的 ES 房间,能高效地被导致区分房间进象 hepatocyte 一样。 | Zhihua Song Jun Cai Yanxia Liu Dongxin Zhao Jun Yong Shuguang Duo Xijun Song Yushan Guo Yang Zhao Han Qin Xiaolei Yin Chen Wu Jie Che Shichun Lu Mingxiao Ding Hongkui Deng | 2009 | Cell Research2009，19，11： | 63 |
| 2 | Metformin inhibits pancreatic cancer metastasis caused by SMAD4 deficiency and consequent HNF4G upregulation显示文摘Pancreatic ductal adenocarcinoma(PDAC)has poor prognosis due to limited therapeutic options.This study examines the roles of genome-wide association study identified PDAC-associated genes as therapeutic targets.We have identified HNF4G gene whose silencing most effectively repressed PDAC cell invasiveness.HNF4G overexpression is induced by the deficiency of transcriptional factor and tumor suppressor SMAD4.Increased HNF4G are correlated with SMAD4 deficiency in PDAC tumor samples and associated with metastasis and poor survival time in xenograft animal model and in patients with PDAC(log-rank P=0.036;HR=1.60,95%CI=1.03–2.47).We have found that Metformin suppresses HNF4G activity via AMPK-mediated phosphorylation-coupled ubiquitination degradation and inhibits in vitro invasion and in vivo metastasis of PDAC cells with SMAD4 deficiency.Furthermore,Metformin treatment significantly improve clinical outcomes and survival in patients with SMAD4-deficient PDAC(log-rank P=0.022;HR=0.31,95%CI=0.14–0.68)but not in patients with SMAD4-normal PDAC.Pathway analysis shows that HNF4G may act in PDAC through the cell-cell junction pathway.These results indicate that SMAD4 deficiency-induced overexpression of HNF4G plays a critical oncogenic role in PDAC progression and metastasis but may form a druggable target for Metformin treatment. | Chengcheng Wang Taiping Zhang Quan Liao Menghua Dai Junchao Guo Xinyu Yang Wen Tan Dongxin Lin Chen Wu Yupei Zhao | 2021 | Protein & Cell2021，12，2： | 5 |
| 3 | Evolution of permafrost in Northeast Chinasince the Late Pleistocene显示文摘In Northeast China, permafrost advanced and retreated several times under the influences of fluctuating paleo-climates and paleo-environments since the Late Pleistocene. During the last 60 years, many new data were obtained and studies were conducted on the evolution of permafrost in Northeast China, but so far no systematic summary and review have been made. Based on sedimentary sequences, remains of past permafrost, paleo-flora and-fauna records, and dating data, permafrost evolution since the Late Pleistocene has been analyzed and reconstructed in this paper. Paleo-temperatures reconstructed from the remains of past permafrost and those from paleo-flora and-fauna are compared, and thus the southern limit of permafrost(SLP) in each climate period is inferred by the relationship of the permafrost distribution and the mean annual air/ground temperatures(MAAT/MAGT). Thus, the evolutionary history of permafrost is here divided into five stages:(1) the Late Pleistocene(Last Glaciation, or LG)(65 to 10–8.5 ka), the Last Glaciation Maximum(LGM, 21–13 ka) in particular, the coldest period in the latest history with a cooling of about 6~10 ?C, characterized by extensive occurrences of glaciation, flourishing Mammathas-Coelodonta Faunal Complex(MCFC), widespread aeolian deposits, and significant sea level lowering, and permafrost greatly expanded southwards almost to the coastal plains(37?N–41?N);(2) the Holocene Megathermal Period(HMP, 8.5–7.0 to 4.0–3.0 ka), 3~5 ?C warmer than today, permafrost retreated to about 52°N;(3) the Late Holocene Cold Period(Neoglaciation)(4.0–3.0 to 1.0–0.5 ka), a cooling of 1~3 ?C, some earlier thawed permafrost was refrozen or attached, and the SLP invaded southwards to 46?N;(4) the Little Ice Age(LIA, 500 to 100–150 a), the latest cold period with significant permafrost expansion; and(5) climate warming since the last century, during which Northeast China has undergone extensive permafrost degradation. The frequent and substantial expansions and retreats of permafrost have greatly impacted cold-region environments in Northeast China. North of the SLP during the HMP, or in the present continuous permafrost zone, the existing permafrost was largely formed during the LG and was later overlapped by the permafrost formed in the Neoglaciation. To the south, it was formed in the Neoglaciation. However, many aspects of permafrost evolution still await further investigations, such as data integration, numerical reconstruction, and merging of Chinese permafrost history with those of bordering regions as well as collaboration with related disciplines. Of these, studieson the evolution and degradation of permafrost during the past 150 years and its hydrological, ecological, and environmental impacts should be prioritized. | HuiJun Jin XiaoLi Chang DongLiang Luo RuiXia He LanZhi Lu SiZhong Yang DongXin Guo XueMei Chen Stuart A.Harris | 2016 | Research in Cold and Arid Regions2016，8，4： | 3 |
| 4 | A comparative analysis of dielectric properties of oil-paper insulation and polymer materials before and after thermal aging显示文摘The shortcomings of oil-immersed transformer solid insulation like low high-temperature resistance of the insulation paper and the uneven distribution of electric field caused by the large difference of dielectric constants between insulation paper and transformer oil,restricted the development of transformer with smaller size and larger capacity.In view of this situation and the transformer’s demand for the dielectric physicochemical and mechanical property of insulation material,polycarbonate,polyester film and polyphenylene sulfide with high high-temperature resistance were chosen for the comparison analysis in this paper We did the 300-day thermal aging experiment on four samples in transformer oil under different aging temperatures of90°C,110°C and 130°C,then analyzed the changes of their dielectric properties.The experiment results are as follows;the permittivity and dielectric dissipation factor of the three polymer materials are apparently smaller than those of the paper both before and after 300-day aging;the volume resistivity and partial discharge inception voltage of the three materials are higher than those of the paper both before and after aging;and the breakdown field strength of polycarbonate is higher than that of the paper both before and after aging,while that of polyester film and polyphenylene sulfide are slightly lower than that of the paper. | WANG Wei YUE CaiPeng HE DongXin YANG Kai CHEN ShengKe | 2014 | Science China(Technological Sciences)2014，57，4： | 2 |
| 5 | Comparison of dimension reduction-based logistic regression models for case-control genome-wide association study:principal components analysis vs.partial least squares显示文摘With recent advances in biotechnology, genome-wide association study(GWAS) has been widely used to identify genetic variants that underlie human complex diseases and traits. In case-control GWAS, typical statistical strategy is traditional logistical regression(LR) based on single-locus analysis. However, such a single-locus analysis leads to the well-known multiplicity problem, with a risk of inflating type I error and reducing power. Dimension reduction-based techniques, such as principal component-based logistic regression(PC-LR), partial least squares-based logistic regression(PLS-LR), have recently gained much attention in the analysis of high dimensional genomic data. However, the perfor?mance of these methods is still not clear, especially in GWAS. We conducted simulations and real data application to compare the type I error and power of PC-LR, PLS-LR and LR applicable to GWAS within a defined single nucleotide polymorphism(SNP) set region. We found that PC-LR and PLS can reasonably control type I error under null hypothesis.On contrast, LR, which is corrected by Bonferroni method, was more conserved in all simulation settings. In particular, we found that PC-LR and PLS-LR had comparable power and they both outperformed LR, especially when the causal SNP was in high linkage disequilibrium with genotyped ones and with a small effective size in simulation. Based on SNP set analysis, we applied all three methods to analyze non-small cell lung cancer GWAS data. | Honggang Yi Hongmei Wo Yang Zhao Ruyang Zhang Junchen Dai Guangfu Jin Hongxia Ma Tangchun Wu Zhibin Hu Dongxin Lin Hongbing Shen Feng Chen | 2015 | The Journal of Biomedical Research2015，29，4： | 2 |
| 6 | Multi-variable Dependent Forecast Algorithm for Predicting Secondary Arc显示文摘Hybrid reactive power compensation(HRPC)combines step-controlled shunt reactors and series compensation,and will be employed in ultra-high-voltage(UHV)power systems.The single-phase auto-reclosure characteristics of secondary arcs in systems with HRPC require further investigation.In this paper,both the arc-recalling voltage and subsidiary variations in arc current are investigated with and without HRPC.The frequency components of the secondary arc current and variations in arcing time are analyzed for various influential factors,such as the neutral reactor,arc resistance,fault location,degrees of compensation of HRPC,and the length of the transmission line.The non-dominated sorting genetic algorithm II(NSGA-II)and support vector machine regression are combined to create a multi-variable dependent forecasting algorithm to predict the characteristics of the secondary arc in UHV systems with HRPC.This paper provides a theoretical reference for optimizing the parameters of HRPC,and for developing adaptive auto-reclosure schemes and protection equipment. | Hongshun Liu Jian Guo Dongxin He Mingming Han Ying Sun Jingjing Yang Qingquan Li | 2020 | CSEE Journal of Power and Energy Systems2020，6，2： | 1 |
| 7 | Risk prediction of esophageal squamous-cell carcinoma with common genetic variants and lifestyle factors in Chinese population显示文摘 | Jiang Chang Ying Huang Lixuan Wei Baoshan Ma Xiaoping Miao Yun Li Zhibin Hu Dianke Yu Weihua Jia Yu Liu Wen Tan Zhonghu He Yang Ke Tangchun Wu Hongbing Shen Yixin Zeng Chen Wu Dongxin Lin | 2013 | Carcinogenesis2013，，8： | 1 |
| 8 | VAV2 is required for DNA repair and implicated in cancer radiotherapy resistance显示文摘Radiotherapy remains the mainstay for treatment of various types of human cancer;however,the clinical efficacy is often limited by radioresistance,in which the underlying mechanism is largely unknown.Here,using esophageal squamous cell carcinoma(ESCC)as a model,we demonstrate that guanine nucleotide exchange factor 2(VAV2),which is overexpressed in most human cancers,plays an important role in primary and secondary radioresistance.We have discovered for the first time that VAV2 is required for the Ku70/Ku80 complex formation and participates in non-homologous end joining repair of DNA damages caused by ionizing radiation. | Weiling Liu Chuanwang Miao Shaosen Zhang Yachen Liu Xiangjie Niu Yiyi Xi Wenjia Guo Jiahui Chu Ai Lin Hongjin Liu Xinyu Yang Xinjie Chen Ce Zhong Yuling Ma Yuqian Wang Shihao Zhu Shuning Liu Wen Tan Dongxin Lin Chen Wu | 2021 | Signal Transduction and Targeted Therapy2021，6，9： | 1 |
| 9 | Genetic Variants in Cyclooxygenase-2 : Expression and Risk of Gastric Cancer and Its Precursors in a Chinese Population显示文摘 | Fen Liu Kaifeng Pan Xuemei Zhang Yang Zhang Lian Zhang Junling Ma Caixuan Dong Lin Shen Jiyou Li Dajun Deng Dongxin Lin Weicheng You | 2006 | Gastroenterology2006，，7： | 1 |
| 10 | Effect and safety of Kanglaite injection combined with chemotherapy in the treatment of advanced colorectal cancer:a systematic review and meta-analysis显示文摘Objective:To evaluate the clinical efficacy and safety of Kanglaite injection combined with chemotherapy and chemotherapy alone in the treatment of advanced colorectal cancer.Methods:PubMed,Cochrane library,CNKI,VIP,Wanfang database were systematically searched by inputting keywords to explore the efficacy of Kanglaite injection combined with chemotherapy in the treatment of advanced colorectal cancer.A random-effects model was selected to evaluate the treatment outcomes.The screening of literature,the extraction of data and the assessment of methodology were independently undertaken by two reviewers.Meta analysis was performed using Revman5.3 software and stata15.0 software.Results:A total of 12 RCTs were included,with 792 cases.Compared with chemotherapy alone,Metaanalysis suggested that Kanglaite injection combined with chemotherapy can improve clinical efficiency(RR=1.45,95%CI:1.21-1.74,P<0.0001)and improve patients'quality of life(RR=1.55,95%CI:1.32-1.82,P<0.00001),improve the patient's immune function(CD3+cells:SWD=1.42,95%CI:1.11-1.73;CD4+/CD8+cell ratio:SWD=0.95,95%CI:0.66-1.25;NK cell activity:SWD=3.24,95%CI:2.81-3.66,P<0.00001);Leukopenia rate(RR=0.63,95%CI:0.54-0.74,P<0.0001),incidence of gastrointestinal adverse reactions(RR=0.56,95%CI:0.48-0.66,P<0.00001),incidence of peripheral neurotoxicity(RR=0.79,95%CI:0.65-0.96,P=0.02)were lower than the chemotherapy alone group,the difference was statistically significant.In improving the hand-foot syndrome and oral mucositis after chemotherapy,there was some difference between the Kanglaite injection combined with chemotherapy group and the chemotherapy alone group,but the difference was not significant.Puber bias detection and sensitivity analysis were performed with clinically effective relative risk(RR)as indicators.The results suggested that the publication bias was not obvious.The results of this study are stable.Conclusion:Compared with chemotherapy alone group in the treatment of advanced colorectal cancer,Kanglaite injection combined with chemotherapy can improve the effective rate,quality of life,immune function of patients and reduce the incidence of leukopenia after chemotherapy,gastrointestinal adverse reactions and peripheral neurotoxicity. | Jinlin Wu Zhu Yang Fengxi Long Bing Yang Xun Liu Xianman Wei Dongxin Tang | 2019 | Asian Toxicology Tesearch2019，1，1： | 1 |
| 11 | A functional BRCA1 coding sequence genetic variant contributes to risk of esophageal squamous cell carcinoma显示文摘 | Xiaojiao Zhang Jinyu Wei Liqing Zhou Changchun Zhou Juan Shi Qipeng Yuan Ming Yang Dongxin Lin | 2013 | Carcinogenesis2013，，10： | 1 |
| 12 | Numerical modeling of the critical pipeline inclination for the elimination of the water accumulation on the pipe floor in oil-water fluid flow显示文摘In this work,numerical models were developed to investigate the critical inclination of a pipeline to eliminate the water accumulation at the floor of the pipe carrying oil-water fluid.Computational fluid dynamics software was used to establish a geometric model of the pipe with various inclination angles,and a grid-independent verification was conducted to determine a reasonable meshing method.Quantitative relationships were determined between the pipe inclination angle and the affecting factors including the flow velocity,viscosity and the pipe diameter,where the water accumulation would not be able to occur.Generally,the critical inclination angle increases with the fluid flow velocity.The refluxing of water is the key mechanism causing the water accumulation at the bottom of the pipe.In addition to the fluid flow velocity,an increase in fluid viscosity and a decrease in the pipe diameter cause an increase of the critical inclination angle that the water phase can be carried away by oil.The model can be used to determine the critical inclination of pipelines carrying oil-water fluid to cause the water accumulation and the operating conditions that can eliminate the accumulation of water phase at the pipe floor. | Xiaoqin Song Dongxin Li Xiao Sun Xingjie Mou Y.Frank Cheng Yuexin Yang | 2021 | Petroleum2021，7，2： | 1 |
| 13 | Literature on the law of Miao medicine in treating liver cancer显示文摘目的:通过苗族医学治疗肝癌药物文献整理分析,探讨苗族医学治疗肝癌的用药规律。方法:以《中华本草·苗药卷》为文献来源,拟定检索词对CNKI数据库、万方数据库建库至2018年5月苗族医药治疗肝癌的相关文献进行检索,符合条件的药物对其科属、药性、药味、归经及功效进行统计分析。结果:共纳入苗族医学治疗肝癌药物132味,高频科属为菊科、百合科、蔷薇科,共占22.8%;药性以冷药为主,占75.8%;药味以苦、辣、甜为主,共占75.5%;归经以热经、冷经为主,共占90.5%;功效以治毒药、补体药、通气散血药为主,共占80.4%。结论:苗族医学治疗肝癌谨守两纲理论之冷热辨证,在治毒的基础上合理运用补体药、通气散血药等标本兼顾。 | Huili Shui Zhu Yang Fengxi Long Wenqi Huang Bing Yang Zhen Zhang Dongxin Tang | 2018 | TMR Clinical Research2018，1，1： | 0 |
| 14 | Probability Density Function of the Euclidean Distance Between Node Pairs in Rectangular Random Graphs and Its Applications in MANETs显示文摘 | GAO Zhenguo WEN Dongxin ZUO Decheng LIU Hongwei YANG Xiaozong | 2006 | Chinese Journal of Electronics2006，15，3： | 0 |
| 15 | A method for detecting two-dimensional plane stress distribution in basin-type insulator based on critically refracted longitudinal wave显示文摘Basin-type insulator often has small cracks due to stress concentration.The current method cannot accurately reflect the stress condition of the insulator to find the stress concentration areas.To solve these problems,a method for detecting two-dimensional plane stress(δ_(1) andδ_(2))within different depth ranges in a basin-type insulator is proposed based on critically refracted longitudinal(LCR)wave.First,the acoustoelastic equation characterising the relationship between the variation of LCR wave propagation time and the plane stress was derived.Next,the propagation characteristics of LCR wave in epoxy resin samples were investigated.Then,the stress distribution within different depth ranges of the insulator subjected to hydraulic load was measured using the proposed method,including direction(θ),δ_(1) andδ_(2).The results show that the magnitude of the stress alone cannot accurately characterise the stress state.Points with equal distances to the centre have similar stress magnitudes,but their directions are not the same.With increasing depth,θremains essentially unchanged at the same location,whileδ1 andδ2 decrease,and the rate of decrease varies at different locations.Comparing the measured and simulated data,the results showed that they were in good agreement,and the maximum errors of stress value andθwere 0.69 MPa and 2.97°,respectively,which confirmed the feasibility and accuracy of the stress detection in the proposed method. | Zhaoyang Kang Fuqiang Ren Hongru Zhang Jingjing Yang Kaining Hou Qingquan Li Dongxin He Hongshun Liu Yongzhi Zhao Huaxin Wen | 2024 | High Voltage2024，9，1： | 0 |
| 16 | A SCHEDULING SCHEME WITH DYNAMIC FREQUENCY CLOCKING AND MULTIPLE VOLTAGES FOR LOW POWER DESIGNS显示文摘In this letter, a scheduling scheme based on Dynamic Frequency Clocking (DFC) and multiple voltages is proposed for low power designs under the timing and the resource constraints. Unlike the conventional methods at high level synthesis where only voltages of nodes were considered, the scheme based on a gain function considers both voltage and frequency simultaneously to reduce energy consumption. Experiments with a number of DSP benchmarks show that the proposed scheme achieves an effective energy reduction. | Wen Dongxin Wang Ling Yang Xiaozong | 2007 | Journal of Electronics(China)2007，24，4： | 0 |
| 17 | Genetic polymorphisms in genes regulating cell death and prognosis of patients with rectal cancer receiving postoperative chemoradiotherapy显示文摘Objective:The identification of biomarkers for predicting chemoradiotherapy efficacy is essential to optimize personalized treatment.This study determined the effects of genetic variations in genes involved in apoptosis,pyroptosis,and ferroptosis on the prognosis of patients with locally advanced rectal cancer receiving postoperative chemoradiotherapy(CRT).Methods:The Sequenom MassARRAY was used to detect 217 genetic variations in 40 genes from 300 patients with rectal cancer who received postoperative CRT.The associations between genetic variations and overall survival(OS)were evaluated using hazard ratios(HRs)and 95%confidence intervals(CIs)computed using a Cox proportional regression model.Functional experiments were performed to determine the functions of the arachidonate 5-lipoxygenase(ALOX5)gene and the ALOX5 rs702365 variant.Results:We detected 16 genetic polymorphisms in CASP3,CASP7,TRAILR2,GSDME,CASP4,HO-1,ALOX5,GPX4,and NRF2 that were significantly associated with OS in the additive model(P<0.05).There was a substantial cumulative effect of three genetic polymorphisms(CASP4 rs571407,ALOX5 rs2242332,and HO-1 rs17883419)on OS.Genetic variations in the CASP4 and ALOX5 gene haplotypes were associated with a higher OS.We demonstrated,for the first time,that rs702365[G]>[C]represses ALOX5 transcription and corollary experiments suggested that ALOX5 may promote colon cancer cell growth by mediating an inflammatory response.Conclusions:Polymorphisms in genes regulating cell death may play essential roles in the prognosis of patients with rectal cancer who are treated with postoperative CRT and may serve as potential genetic biomarkers for individualized treatment. | Hongxia Chen Luxi Yin Jie Yang Ningxin Ren Jinna Chen Qixuan Lu Ying Huang Yanru Feng Weihu Wang Shulian Wang Yueping Liu Yongwen Song Yexiong Li Jing Jin Wen Tan Dongxin Lin | 2023 | Cancer Biology & Medicine2023，20，4： | 0 |
| 18 | Astragalus injection as an adjuvant treatment for colorectal cancer:a meta-analysis显示文摘Background:The combination of Chinese patent medicine Astragalus injection and Western medicine has achieved a certain clinical effect in colorectal cancer patients.However,due to the uneven basic conditions and research indicators of these clinical trials,it is difficult to comprehensively evaluate the effect of Astragalus injection in the adjuvant treatment of colorectal cancer.This study aimed to systematically evaluate the efficacy and safety of Astragalus injection as an adjuvant treatment for colorectal cancer.Methods:The Cochrane Library,VIP database,Wanfang database,and Chinese Academic Journal Full Text database were searched for potentially eligible articles from inception to December 15,2018.Randomized controlled trials in which patients were diagnosed with colorectal cancer were included.Patients in the control group received chemotherapy alone or combined with other drugs,or chemotherapy combined with radiotherapy.Patients in the experimental group were treated with Astragalus injection combined with interventions in the control group.Results:A total of 8 articles were included.Compared with Western medicine alone,the Astragalus injection could improve the therapeutic effect(RR=1.18,95%CI(1.01,1.38),P=0.03),improved the quality of life of colorectal cancer patients(SMD=1.18,95%CI(0.86,1.50),P<0.001),inhibited leukopenia(RR=0.55,95%CI(0.42,0.71),P<0.001),reduced neurotoxicity(RR=0.43,95%CI(0.34,0.56),P<0.001),and reduced the incidence of nausea and vomiting(RR=0.67,95%CI(0.55,0.80),P<0.001).Conclusion:Astragalus injection can reduce the toxicity and improve the efficiency of the conventional Western medicine in the treatment of colorectal cancer. | Jia Wang Zhu Yang Fengxi Long Li Luo Jinlin Wu Ting Yu Dongxin Tang | 2020 | Traditional Medicine Research2020，5，1： | 0 |
| 19 | Simulation of Ultrasonic Propagation in Transformers within Thermal Fields and Intelligent Methodology for Hot-spot Temperature Recognition显示文摘Hot-spot temperature of transformer windings is a crucial indicator of internal defects.However,current methods for measuring the hot-spot temperature of transformers do not apply to those already in operation and suffer from data lag.This study introduces a novel inversion method that combines ultrasonic sensing technology,multiphysics simulation,and the K-nearest neighbors algorithm.Leveraging the penetrative ability and temperature sensitivity of ultrasonic sensing,a detailed physical field simulation model was established.This study extensively investigates the characteristics of ultrasonic wave signals inside transformers.The investigation includes different temperature fields,ranging from 40℃ to 110℃ at 10℃ intervals,and various ultrasonic wave emitter conditions.By extracting the key features of the acoustic signals,such as the peak time,propagation time,and peak amplitude,an accurate inversion of the winding hot-spot temperature is successfully achieved.The results demonstrate that this method achieves a high accuracy rate(98.57%)in inverting the internal winding hot-spot temperatures of transformers,offering an efficient and reliable new approach for measuring winding hot-spot temperatures. | Dongxin He Dechao Yang Xinhua Guo Jiefeng Liu Haoxin Guo Qingquan Li Gilbert Teyssedre | 2024 | Chinese Journal of Electrical Engineering2024，10，1： | 0 |
| 20 | Discrimination of background events in the PolarLight X-ray polarimeter显示文摘PolarLight is a space-borne X-ray polarimeter that measures the X-ray polarization via electron tracking in an ionization chamber.It is a collimated instrument and thus suffers from the background on the whole detector plane.The majority of background events are induced by high energy charged particles and show ionization morphologies distinct from those produced by X-rays of interest.Comparing on-source and off-source observations,we find that the two datasets display different distributions on image properties.The boundaries between the source and background distributions are obtained and can be used for background discrimination.Such a means can remove over 70%of the background events measured with PolarLight.This approaches the theoretical upper limit of the background fraction that is removable and justifies its effectiveness.For observations with the Crab nebula,the background contamination decreases from 25%to 8%after discrimination,indicative of a polarimetric sensitivity of around 0.2 Crab for PolarLight.This work also provides insights into future X-ray polarimetric telescopes. | Jiahuan Zhu Hong Li Hua Feng Jiahui Huang Xiangyun Long Qiong Wu Weichun Jiang Massimo Minuti Saverio Citraro Hikmat Nasimi Dongxin Yang Jiandong Yu Ge Jin Ming Zeng Peng An Luca Baldini Ronaldo Bellazzini Alessandro Brez Luca Latronico Carmelo Sgrò Gloria Spandre Michele Pinchera Fabio Muleri Paolo Soffitta Enrico Costa | 2021 | Research in Astronomy and Astrophysics2021，21，9： | 0 |
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