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1Evolution of the novel coronavirus from the ongoing Wuhan outbreak and modeling of its spike protein for risk of human transmission显示文摘Dear Editor,The occurrence of concentrated pneumonia cases in Wuhan city,Hubei province of China was first reported on December 30,2019 by the Wuhan Municipal Health Commission(WHO,2020).The pneumonia cases were found to be linked to a large seafood and animal market in Wuhan,and measures for sanitation and disinfection were taken swiftly by the local government agency.The Centers for Disease Control and Prevention(CDC)and Chinese health authorities later determined and announced that a novel coronavirus(CoV),denoted as 2019-nCoV,had caused the pneumonia outbreak in Wuhan city(CDC,2020).Scientists from multiple groups had obtained the virus samples from hospitalized patients(Normile,2020).The isolated viruses were morphologically identical when observed under electron microscopy.Xintian Xu Ping Chen Jingfang Wang Jiannan Feng Hui Zhou Xuan Li Wu Zhong Pei Hao 2020Science China(Life Sciences)2020,63,3:737
2Mobius Isoparametric Hypersurfaces in S^(n+1) with Two Distinct Principal CurvaturesHai Zhong LI Department of Mathematics, Tsinghua University. Beijing 100084. P. R. China Hui Li LIU Department of Mathematics, Northeastern University. Shenyang 110000. P. R. China Chang Ping WANG Key Laboratory of Pure and Applied Mathematics, School of Mathematical Sciences. Peking University, Beijing 100871, P. R. China Guo Song ZHAO Department of Mathematics, Sichuan University, Chengdu 610064. P. R. China 2002Acta Mathematica Sinica,English Series2002,18,3:53
3The Constrained Solutions of Two Matrix EquationsAn Ping LIAO Zhong Zhi BAI Department of Mathematics. Hunan University. Changshu, 410082. P. R. China Department of Mathematics and Information Science, Changsha University, Changsha 410003. P. R. China Academy of Mathematics and System. Sciences. Chinese Academy of Sciences. Beijing 100080. P. R. China State Key Laboratory of Scientific/Engineering Computing. Chinese Academy of Sciences. Institute of Computational Mathematics and Scientific/Engineering Computing. Academy of Mathematics and System Sciences. Chinese Academy of Sciences. P. O. Box 2719. Beijing 100080. P. R. China 2002Acta Mathematica Sinica,English Series2002,18,4:40
4Does Helicobacter pylori infection play a role in iron deficiency anemia? A meta-analysis显示文摘AIM:To perform a meta-analysis of observational studies and randomized controlled trials(RCTs)on the association between Helicobacter pylori(H.pylori)and iron deficiency anemia(IDA).METHODS:A defined search strategy was used to search Medline,Embase,the Cochrane Library,Clinical Trials,Cochrane Central Register of Controlled Trials,Premedline and Healthstar.Odds ratio(OR)was used to evaluate observational epidemiology studies,and weighted mean difference(WMD)was used to demonstrate the difference between control and intervention groups.RESULTS:Fifteen observational studies and 5 RCTs were identified and used for calculation.The pooled OR for observational studies was 2.22(95%CI:1.52-3.24,P<0.0001).The WMD for hemoglobin(HB) was 4.06 g/L(95%CI:-2.57-10.69,P=0.01),and the WMD for serum ferritin(SF)was 9.47μg/L(95%CI:-0.50-19.43,P<0.0001).Results were heterogeneous for all comparisons.CONCLUSION:This meta-analysis on observational studies suggests an association between H.pylori and IDA.In RCTs,eradication of H.pylori can improve HB and SF levels but not significantly.Qu, Xin-Hua Huang, Xiao-Lu Xiong, Ping Zhu, Cui-Ying Huang, You-Liang Lu, Lun-Gen Sun, Xu Rong, Lan Zhong, Liang Sun, Da-Yu Lin, Hai Cai, Ming-Ci Chen, Zhi-Wei Hu, Bing Wu, Lian-Ming Jiang, Yi-Bin Yan, Wei-Li 2010World Journal of Gastroenterology2010,16,7:34
5The Relationship between Glucose Excursion and Cognitive Function in Aged Type 2 Diabetes Patients显示文摘Objective Evidence suggests that type 2 diabetes (T2DM) is associated with an increased risk of dementia and that glucose variability is an independent risk factor for diabetic complications.This study investigated the relationship between glucose excursion and cognitive function in aged T2DM patients.Methods A total of 248 aged T2DM patients wore a continuous glucose monitoring system (CGMS) for 3 days in order to evaluate glucose excursion,including mean amplitude of glycemic excursions (MAGE) and mean of daily difference (MODD).All subjects were evaluated with a number of accepted cognitive function tests,including themini‐mental status examination (MMSE).The relationship between MAGE and MODD and performance on these cognitive tests was assessed.Results The MAGE and MMSE score were negatively correlated,likewise with the correlation between MODD and MMSE.Liner multivariate regression analysis showed that MAGE and MODD were also negatively related to MMSE independent of age,sex,glycemic control,hypertension,smoking,or coronary heart disease history.Conclusion Glucose excursion is related to cognitive function in aged T2DM patients.Elevated glucose excursion decreased the MMSE score,which reflects general cognitive function.Thus,therapy aimed at controlling glucose excursion may be beneficial for maintaining cognitive function in aged T2DM patients.ZHONG Yuan ZHANG Xiao Yan MIAO Ya ZHU Jie Hua YAN Hong WANG Bei Yun JIN Jun HU Ting Jun JIA Wei Ping 2012Biomedical and Environmental Sciences2012,25,1:34
6cMyc-mediated activation of serine biosynthesis pathway is critical for cancer progression under nutrient deprivation conditions显示文摘癌症房间被知道经历新陈代谢的 reprogramming 然而,支撑幸存和快速的增长 oncogenic 损害怎么在各种各样的强调条件下面协调新陈代谢的开关,尚待充分被阐明。这里,我们显示出葡萄糖或夫酸安的那剥夺,为癌症房间的二主要营养来源,被伴随由的戏剧性地激活的丝氨酸生合成小径(SSP ) 提高了 cMyc 表示。我们进一步鉴别那 cMyc 刺激了 SSP 激活由 transcriptionally 多重 SSP 酶的 upregulating 表示。而且,我们证明 cMyc 便于的 SSP 激活导致了提高的谷胱甘肽(GSH ) 生产,房间周期前进和 nucleic 酸合成,它在剥夺营养素的条件下面特别为房间幸存和增长是必要的。我们进一步揭开了那 phosphoserine 磷酸酶( PSPH ), SSP 小径的最后的限制率的酶,在 vitro 并且在 vivo 为 驾驶cMyc 的癌症前进是批评的,并且重要地, PSPH 的异常表示高度在 hepatocellular 与死亡被相关癌( HCC )病人,一般来说建议在这 调整cMyc 的酶,或 SSP 激活之间的一种潜在的原因的关系,并且癌症开发。一起拿,我们的结果表明 cMyc 的那异常表情导致提高的 SSP 激活,新陈代谢的开关的必要部分,在剥夺营养素的条件下面便于癌症前进。Linchong Sun Libing Song Qianfen Wan Gongwei Wu Xinghua Li Yinghui Wang Jin Wang Zhaoji Liu Xiuying Zhong Xiaoping He Shengqi Shen Xin Pan Ailing Li Yulan Wang Ping Gao Huiru Tang Huafeng Zhang 2015Cell Research2015,25,4:33
7Protective effects of polydatin against CCl_4-induced injury to primarily cultured rat hepatocytes显示文摘NTRODUCTIONPolygonumcuspidatumSieb.etZucc.(Polygonaceae)isatraditionalChineseherbaldrug,withbitertasteandcoldnature.Itmainly...HUANG Zhao Sheng, WANG Zong Wei, LIU Ming Ping, ZHONG Shi Qing, LI Qiao Mei and RONG Xiang Lu 1999World Journal of Gastroenterology1999,5,1:24
8The Role of Fibrocyte in the Pathogenesis of Silicosis显示文摘Exposure to free silica induces silicosis and myofibroblasts are regarded as primary effector cells.Fibrocytes can differentiate into myofibroblast.Therefore,the present study was designed to investigate whetherLI Juan YAO Wu HOU Jian Yong ZHANG Lin BAO Lei CHEN Hui Ting WANG Di YUE Zhong Zheng LI Yi Ping ZHANG Miao YU Xing Hao ZHANG Jian Hui QU Ya Qian HAO Chang Fu 2018Biomedical and Environmental Sciences2018,31,4:20
9The cloning of 3'-truncated preS/S gene from HBV genomic DNA and its expression in transgenic mice显示文摘INTRODUCTIONHepatitis B virus (HBV) is regarded as one of themain etiologic factors involved in the developmentof human hepatocellular carcinoma (HCC).The open reading frame (orf)of X gene of HBVencoded a transactivating factor is the evidence thatstrongly supported the notion that the X gene ofHBV DNA integrated in HCC genomic DNA couldcontribute to the carcinogenesis of liver cells byactivation of some related cellular genesYi Ping Hu~1 Yu Cheng Yao~1 Jian Xiu Li~1 Xin Min Wang~1 Hong Li~2 Zhong Hua Wang~1 Zhang Heng Lei~3 1 Department of Cell Biology,Second Military Medical University,Shanghai 200433,China 2 Department of Biology,Department of Basic Medicine,West-China University of Medical Sciences,Chengdu 610041,China 3 Department of Biology,North Sichuan Medical College,Nanchong 637007,China 2000World Journal of Gastroenterology2000,6,5:18
10Gene therapy for human colorectal carcinoma using human CEA promoter controlled bacterial ADP-ribosylating toxin genes:PEA and DTA gene transfer显示文摘INTRODUCTIONAmajorrequirementforinvivogenetherapyforcanceristotargetthetherapeuticgeneexpresiontomalignanttissuesbyselectingp...CAO Guang Wen 1, QI Zhong Tian 1, PAN Xin 1, ZHANG Xiao Qin 1, MIAO Xiao Hui 1, FENG Yan 1, LU Xin Hua 1, Shigeki Kuriyama 2 and DU Ping 1 1998World Journal of Gastroenterology1998,4,5:18
11Regulation of OsSPX1 and OsSPX3 on Expression of OsSPX Domain Genes and Pi-starvation Signaling in Rice显示文摘The rice(Oryza sativa L.) genome contains at least six genes exclusively with an SPX(SYG1/PHO81/XPR1) domain at the N-terminal,designated as OsSPX1-6.Here we report the diverse expression patterns of the OsSPX genes in different tissues and their responses to Pi-starvation.Among them,five genes,OsSPX1,2,3,5 and 6 are responsive to Pi-starvation in shoots and/or in roots.The subcellular localization analysis indicates that OsSPX1 and OsSPX2 is exclusively located in nucleus,OsSPX3 in the cytoplasm,and OsSPX4 is a membrane localization protein.OsSPX1 regulates OsSPX2,3 and 5 at the transcription level and is positively involved in the responses of the genes to Pi-starvation.Overexpression of OsSPX3 downregulates OsSPX5 in shoots under Pi-sufficiency.OsSPX3 negatively regulates the PSI(Pi-starvation induced) gene,OsIPS1 and is involved in the responses of miR399 and OsPHO2 to Pi-starvation.Our results suggest that OsSPX1 may be a regulator involved in the transcriptions of OsSPX2,3 and 5.OsSPX3 plays a role in OsIPS1/miR399 mediated long distance regulation on OsPHO2.Our results also indicate that OsSPX3 is involved in plant tolerance to Pi-starvation stress.Zhiye Wang Han Hu Hongjie Huang Ke Duan Zhong changWu Ping Wu 2009Journal of Integrative Plant Biology2009,51,7:18
12Effectiveness of Different Waist Circumference Cut-off Values in Predicting Metabolic Syndrome Prevalence and Risk Factors in Adults in China显示文摘Objective To study the effectiveness of waist circumference cut-off values in predicting the prevalence of metabolic syndrome(MetS) and risk factors in adults in China. Methods A cross-sectional survey was condcuted in 14 provinces(autonomous region, municipality) in China. A total of 47 325 adults aged ≥20 years were selected by multistage stratified sampling, and questionnaire survey and physical and clinical examination were conducted among them. MetS was defined according to the International Diabetes Federation(IDF) criteria and modified IDF criteria.Results The age-standardized prevalence of MetS was 24.2%(22.1% in men and 25.8% in women) and 19.5%(22.1% in men and 18.0% in women) according to the IDF criteria and modified IDF criteria respectively. The age-standardized prevalence of pre-MetS was 8.1%(8.6% in men and 7.8% in women) according to the modified IDF criteria. The prevalence of MetS was higher in urban residents than rural residents and in northern China residents than in southern China residents. The prevalence of central obesity was about 30% in both men and women according to the ethnicity-specific cut-off values of waist circumference for central obesity(90 cm for men and 85 cm for women). Multivariate regression analysis revealed no significant difference in risk factors between the two MetS definitions. Conclusion Using both the modified IDF criteria and ethnicity-specific cut-off values of waist circumference can provide more useful information about the prevalence of MetS in China.ZHOU Hai Cheng LAI Ya Xin SHAN Zhong Yan JIA Wei Ping YANG Wen Ying LU Ju Ming WENG Jian Ping JI Li Nong LIU Jie TIAN Hao Ming JI Qiu He ZHU Da Long CHEN Li GUO Xiao Hui ZHAO Zhi Gang Li Qiang ZHOU Zhi Guang GE Jia Pu SHAN Guang Liang 2014Biomedical and Environmental Sciences2014,27,5:17
13A drug-eluting Balloon for the trEatment of coronarY bifurcatiON lesions in the side branch:a prospective multicenter ranDomized (BEYOND)clinical trial in China显示文摘Background:Treatment of coronary bifurcation lesions remains challenging;a simple strategy has been preferred as of late,but the disadvantage is ostium stenosis or even occlusion of the side branch(SB).Only a few single-center studies investigating the combination of a drug-eluting stent in the main branch followed by a drug-eluting balloon in the SB have been reported.This prospective,multicenter,randomized study aimed to investigate the safety and efficacy of a paclitaxel-eluting balloon(PEB)compared with regular balloon angioplasty(BA)in the treatment of non-left main coronary artery bifurcation lesions.Methods:Between December 2014 and November 2015,a total of 222 consecutive patients with bifurcation lesions were enrolled in this study at ten Chinese centers.Patients were randomly allocated at a 1:1 ratio to a PEB group(n=113)and a BA group(n=109).The primary efficacy endpoint was angiographic target lesion stenosis at 9 months.Secondary efficacy and safety endpoints included target lesion revascularization,target vessel revascularization,target lesion failure,major adverse cardiac and cerebral events(MACCEs),all-cause death,cardiac death,non-fatal myocardial infarction,and thrombosis in target lesions.The main analyses performed in this clinical trial included case shedding analysis,base-value equilibrium analysis,effectiveness analysis,and safety analysis.SAS version 9.4 was used for the statistical analyses.Results:At the 9-month angiographic follow-up,the difference in the primary efficacy endpoint of target lesion stenosis between the PEB(28.7%±18.7%)and BA groups(40.0%±19.0%)was-11.3%(95%confidence interval:-16.3%to-6.3%,Psuperiority<0.0001)in the intention-to-treat analysis,and similar results were recorded in the per-protocol analysis,demonstrating the superiority of PEB to BA.Late lumen loss was significantly lower in the PEB group than in the BA group(-0.06±0.32 vs.0.18±0.34 mm,P<0.0001).For intention-to-treat,there were no significant differences between PEB and BA in the 9-month percentages of MACCEs(0.9%vs.3.7%,P=0.16)or non-fatal myocardial infarctions(0 vs.0.9%,P=0.49).There were no clinical events of target lesion revascularization,target vessel revascularization,target lesion failure,all-cause death,cardiac death or target lesion thrombosis in either group.Conclusions:In de novo non-left main coronary artery bifurcations treated with provisional T stenting,SB dilation with the PEB group demonstrated better angiographic results than treatment with regular BA at the 9-month follow-up in terms of reduced target lesion stenosis.Trial registration:ClinicalTrials.gov,NCT02325817;http://gffzzd3f38a9638994581spovw56qbnofx6pvw.ffgz.tsg.suse.edu.cn.Quan-Min Jing Xin Zhao Ya-Ling Han Ling-Ling Gao Yang Zheng Zhan-Quan Li Ping Yang Hong-Liang Cong Chuan-Yu Gao Tie-Min Jiang Hui Li Jun-Xia Li Dong-Mei Wang Geng Wang Zhan-Chun Cong Zhong Zhang 2020Chinese Medical Journal2020,,8:17
14Asymptomatic patients of chronic obstructive pulmonary disease in China显示文摘背景长期的妨碍的肺的疾病(COPD ) 让可变自然历史和并非所有个人跟随一样的功课。这研究试图在 China.Methods 从基于人口的调查识别无征状的 COPD 病人的流行和特征多级式的簇采样策略从七不同省 / 城市在一张人口被使用。所有居民(超过 40 岁) 与一张标准化问询表被会见, spirometry.Post-bronchodilator 在 1 秒(FEV1 ) 强迫了吐气的体积 /forced 不到 70% 的重要能力(FVC ) 被定义为 COPD 的诊断标准。屏蔽的所有 COPD 病人根据长期的呼吸症状的存在或缺席被划分成征兆的组和无征状的组。Socio 人口统计,个人和暴露变量被收集,在从 25 627 采样与 COPD 被诊断的 1668 个病人之中的 analyzed.Results 使遭到,(35.3%) 589 是无征状的。年龄,性别,身体团索引(BMI ) ,农村、城市的分布,吸烟习惯和教育层次在二个组是类似的。64.7% 无征状的病人的一个总数没有 comorbidities。心血管的疾病和肺癌症比无征状的 group.Asymptomatic COPD 组多半是更少在厨房,呼吸疾病的家庭历史和周期性的童年咳嗽里与差的通风介绍的在征兆的 COPD 病人之中是更普通的。无征状的 COPD 病人有的显著地更高的 FEV1 (73.1% 对 61.0%) , FVC (91.9% 对 82.0%) ,和 FEV1/FVC (62.9%vs.58.7%) 的更高的比率(所有 P < 0.001 ) 比征兆的组。更无征状的病人是 underdiagnosed (91.9%vs.54.3% , P < 0.001 ) 比征兆的 patients.Conclusions,这大基于人口的调查在中国证实了无征状的 COPD 病人的高流行。屏蔽测试的呼吸量测定法的更多的使用可能对 COPD 的早察觉重要。LU Ming YAO Wan-zhen ZHONG Nan-shan ZHOU Yu-min WANG Chen CHEN Ping KANG Jian HUANG Shao-guang CHEN Bao-yuan WANG Chang-zheng NI Dian-tao WANG Xiao-ping WANG Da-li LIU Sheng-ming Lv Jia-chun SHEN Ning DING Yan-ling RAN Pi-xin 2010Chinese Medical Journal2010,,12:17
15Prevalence, awareness, treatment, and control of hypertension in the non-dialysis chronic kidney disease patients显示文摘ZHENG Ying CAI Guang-yan CHEN Xiang-mei FU Ping CHEN Jiang-hua DING Xiao-qiang YU Xue-qing LIN Hong-li LIU Jian XIE Ru-juan WANG Li-ning NI Zhao-hui LIU Fu-you YIN Ai-ping XING Chang-ying WANG Li SHI Wei LIU Jian-she HE Ya-ni DING Guo-hua LI Wen-ge WU Guang-li MIAO Li-ning CHEN Nan SU Zhen MEI Chang-lin ZHAO Jiu-yang GU Yong BAI Yun-kai LUO Hui-min LIN Shan CHEN Meng-hua GONG Li YANG Yi-bin YANG Xiao-ping LI Ying WAN Jian-xin WANG Nian-song LI Hai-ying XI Chun-sheng HAO Li XU Yan FANG Jing-ai LIU Bi-cheng LI Rong-shan WANG Rong ZHANG Jing-hong WANG Jian-qin LOU Tan-qi SHAO Feng-min MEI Feng LIU Zhi-hong YUAN Wei-jie SUN Shi-ren ZHANG Ling ZHOU Chun-hua CHEN Qin-kai JIA Shun-lian GONG Zhi-feng GUAN Guang-ju XIA Tian ZHONG Liang-bao 2013Chinese Medical Journal2013,,12:16
16Moutan Cortex and Paeoniae Radix Rubra reverse high-fat-diet-induced metabolic disorder and restore gut microbiota homeostasis显示文摘The present study was designed to investigate the therapeutic effcts of Moutan Cortex(CM,root bark of Paeonia suffruticosa Andr) and Paeoniae Radix Rubra(PR,root of Paeonia veitchii Lynch) on metabolic disorders,focusing on the infuence of CM and PR on the obesity-related gut microbiota homeostasis.The diet-induced obese(DIO) mouse model was used to test the therapeutic effects of CM and PR.The mice were orally administered with CM and PR for 6 weeks,and oral glucose tolerance test(OGTT) and insulin tolerance test(ITT) were performed to evaluate the insulin sensitivity of the mice.Sterol-regulatory element binding proteins(SREBPs) and their target genes were measured by quantitative RT-PCR.High-throughput 16 S ribosomal RNA(16S rR NA) gene sequencing technology was used to determine the composition of gut microbiota,and the metabolites in serum were analyzed by GC-MS.Our results indicated that CM and PR combination alleviated obese and insulin resistance in the DIO mice,leading to increased glucose uptake and gene expression in muscle and liver,and down-regulated SREBPs and their target genes in liver.Interesting,neither the CM-PR extracts,nor the major components of CM and PR did not affect SREBPs activity in cultured cells.Meanwhile,CM and PR significantly modulated the gut microbiota of the high-fat diet(HFD) treated mice,similar to metformin,and CM-PR reversed the overall microbiota composition similar to the normal chow diet(NCD) treated mice.In conclusion,our results provide novel mechanisms of action for the effects of CM and PR in treating DIO-induced dysregulation of sugar and lipid metabolism.ZHONG Ling-Jun XIE Zhi-Sheng YANG Hua LI Ping XU Xiao-Jun 2017Chinese Journal of Natural Medicines2017,15,3:15
17Synthesis of new tetrazene(N-N=N-N)-linked bi(1,2,4-triazole)显示文摘The reaction of 4-amino-1,2,4-triazole with sodium dichloroisocyanurate (SDCI) afforded new tetrazene(N-N=N-N)-linked bi(1.2,4-triazole) 2a in excellent yield.Increasing the molar ratio of SDCI to 4-amino-1,2,4-triazole,the chlorinated product 1,5,5′- trichloro-4,4′-azo-1,2,4-triazole (2b) was formed.These new compounds have been characterized by MS,~1H NMR,^(13)C NMR,and elemental analysis.Sheng Hua Li Si Ping Pang Xiao Tong Li Yong Zhong Yu Xin Qi Zhao 2007Chinese Chemical Letters2007,18,10:14
18Effect of high glucose levels on the calcification of vascular smooth muscle cells by inducing osteoblastic differentiation and intracellular calcium deposition via BMP-2/Cbfα-1 pathway显示文摘In this paper,we investigate the effect and the possible mechanism of high glucose levels on the calcification of human aortic smooth muscle cells (HASMCs).HASMCs were divided into four groups: normal glucose group (NG),osmolality control group (OC),high glucose group (HG,HASMCs culture medium containing 30 mmol/L glucose),and high glucose plus recombinant human Noggin protein (bone morphogenetic protein-2 (BMP-2) antagonist) group (HN).The mRNA levels and the protein expressions of BMP-2 and core binding factor alpha-1 (Cbfα-1) were measured by real-time quantitative polymerase chain reaction (PCR) and Western blot.After induced by 10 mmol/L β-glycerol phosphoric acid,cells were harvested for assessments of alkaline phosphatase (ALP) activities at Days 1,2,and 3,and intracellular calcium contents at Days 7 and 14,respectively.High glucose levels increased the mRNA levels and the protein expressions of BMP-2 and Cbfα-1 (P<0.05).The expression of Cbfα-1 was partially blocked by Noggin protein (P<0.05),while BMP-2 was not (P>0.05).After being induced by β-glycerol phosphoric acid,high glucose levels increased the ALP activity [(48.63±1.03) vs.(41.42±2.28) U/mg protein,Day 3;P<0.05] and the intracellular calcium content [(2.76±0.09) vs.(1.75±0.07) μmol/mg protein,Day 14;P<0.05] in a time-dependent manner when compared with the NG group,while the ALP activity could not be blocked by Noggin protein [(48.63±1.03) vs.(47.37±0.97) U/mg protein,Day 3;P>0.05].These results show that high glucose levels can evoke the calcification of HASMCs by inducing osteoblastic trans-differentiation and intracellular calcium deposition via the BMP-2/Cbfα-1 pathway,which can be partially blocked by Noggin protein.Fang LIU Hui ZHONG Jing-yuan LIANG Ping FU Zhi-juan LUO Li ZHOU Rong GOU Jun HUANG 2010Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)2010,11,12:12
19Excitation and Detection of Shear Horizontal Waves with Electromagnetic Acoustic Transducers for Nondestructive Testing of Plates显示文摘The fundamental shear horizontal(SH0) wave has several unique features that are attractive for long-range nondestructive testing(NDT). By a careful design of the geometric configuration, electromagnetic acoustic transducers(EMATs) have the capability to generate a wide range of guided wave modes, such as Lamb waves and shear-horizontal(SH) waves in plates. However, the performance of EMATs is influenced by their parameters. To evaluate the performance of periodic permanent magnet(PPM) EMATs, a distributed-line-source model is developed to calculate the angular acoustic field cross-section in the far-field. Numerical analysis is conducted to investigate the performance of such EMATs with different geometric parameters, such as period and number of magnet arrays, and inner and outer coil widths. Such parameters have a great influence on the directivity of the generated SH0 waves that arises mainly in the amplitude and width of both main and side lobes. According to the numerical analysis, these parameters are optimized to obtain better directivity. Optimized PPM EMATs are designed and used for NDT of strip plates. Experimental results show that the lateral boundary of the strip plate has no perceivable influence on SH0-wave propagation, thus validating their used in NDT. The proposed model predicts the radiation pattern of PPM EMATs, and can be used for their parameter optimization.MA Qingzeng JIAO Jingpin HU Ping ZHONG Xi WU Bin HE Cunfu 2014Chinese Journal of Mechanical Engineering2014,27,2:12
20Highly efficient and stable white LEDs based on pure red narrow bandwidth emission triangular carbon quantum dots for wide-color gamut backlight displays显示文摘High-performance white light-emitting diodes (WLEDs) hold great potential for the next-generation backlight display applications.However,achieving highly efficient and stable WLEDs with wide-color-gamut has remained a formidable goal.Reported here is the first example of pure red narrow bandwidth emission triangular CQDs (PR-NBE-T-CQDs) with photoluminescence peaking at 610 nm.The PR-NBE-T-CQDs synthesized from resorcinol show high quantum yield (QY) of 72% with small full width at half maximum of 33 nm.By simply controlling the reaction time,pure green (PG-) NBE-T-CQDs with high QY of 75% were also obtained.Highly efficient and stable WLEDs with wide-color-gamut based on PR- and PG-NBE-T-CQDs was achieved.This WLED showed a remarkable wide-color gamut of 110% NTSC and high power efficiency of 86.5 lumens per Watt.Furthermore,such WLEDs demonstrate outstanding stability.This work will set the stage for developing highly efficient,low cost and environment-friendly WLEDs based on CQDs for the next-generation wide-color gamut backlight displays.Fanglong Yuan Ping He Zifan Xi Xiaohong Li Yunchao Li Haizheng Zhong Louzhen Fan Shihe Yang 2019Nano Research2019,12,7:12
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