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1Ten cities cross-sectional questionnaire survey of children asthma and other allergies in China显示文摘Asthma,rhinitis and eczema(allergic or non-allergic)have increased throughout the world during the last decades,especially among children.Changes in the indoor environment are suspected to be important causes.China has experienced a dramatic change in indoor environmental exposures during the past two decades.However,such changes and their associations with children’s asthma and other health aspects have not been thoroughly studied.China,Children,Homes,Health(CCHH),Phase I,was a cross-sectional questionnaire survey of 48219 children 1–8 years old in 10 Chinese cities during 2010–2012.The questionnaire includes the International Study of Asthma and Allergies in Childhood(ISAAC)core health questions and additional questions regarding housing,life habits and outdoor environment.In health analyses,children aged 3–6 years old were included.The prevalences of doctor diagnosed asthma varied from 1.7%to 9.8%(mean 6.8%),a large increase from 0.91%in 1999 and 1.50%in2000.The prevalence of wheeze,rhinitis and atopic eczema(last 12 months)varied from 13.9%to 23.7%,24.0%to 50.8%and4.8%to 15.8%,respectively.Taiyuan had the lowest prevalences of all illnesses and Shanghai the highest,except for wheezewhere the highest value was for Urumqi.We found(1)no obvious association between disease prevalences and ambient PM10concentrations and(2)higher prevalences of disease in humid climates with hot summers and cold winters,but with no centrally heated buildings.Associations between the diseases and economic status as indexed by Gross Domestic Product(GDP)requires further study.ZHANG YinPing LI BaiZhan HUANG Chen YANG Xu QIAN Hua DENG QiHong ZHAO ZhuoHui LI AnGui ZHAO JiaNing ZHANG Xin QU Fang HU Yu YANG Qin WANG Juan ZHANG Ming WANG Fang ZHENG XiaoHong LU Chan LIU ZhiJian SUN YueXia MO JinHan ZHAO YiLi LIU Wei WANG TingTing NORBCK Dan BORNEHAG Carl-Gustaf SUNDELL Jan 2013Chinese Science Bulletin2013,58,34:22
2A novel gene delivery system targeting cells expressing VEGF receptors显示文摘Two ligand oligopeptides GV1 and GV2 were designed according to the putative binding region of VEGF to its receptors. GV1, GV2 and endosome releasing oligopeptide HA20 were conjugated with poly-L-lysine or protamine and the resulting conjugates could interact with DNA in a noncovalent bond to form a complex. Using pSV2-β-galactosidase as a reporter gene, it has been demonstrated that exogenous gene was transferred into bovine aortic arch-derived endothelial cells (ABAE) andhuman malignant melanoma cell lines (A375) in vitro. In vivo experiments, exogenous gene was transferred into tumor vascular endothelial cells and tumor cells of subcutaneously transplanted human colon cancer LOVO, human malignant melanoma A375 and human hepatoma graft in nude mice. This system could also target gene to intrahepatically transplanted human hepatoma injected via portal vein in nude mice. These results are correlated with theGene delivery system targeting VEGF receptors relevant receptors (flt-1, flk-1/KDR) expression on the targeted cells and tissues.LI JUN MIN JUN SONG HAN YI HUANG PEI KUN TIAN SHU MIN QU MIN YAO HUI QIU JIANG DA FANG WAN JING CHU LUO CHENG XIAO GU JIAN REN GU( National Labomtory for Oncogenes and Related Genes, Shanghai Cancer Institute, Shanghai 200032,China)(National Laboratory of 1999Cell Research1999,9,1:22
3Expression of insulin-like growth factor Ⅱ and its receptor in liver cells of chronic liver diseases显示文摘ExpressionofinsulinlikegrowthfactorⅡanditsreceptorinlivercelsofchronicliverdiseasesYANGDongHua1,XIUChong1,YANGBo1,GUJianR...YANG Dong Hua 1, XIU Chong 1, YANG Bo 1, GU Jian Ren 2, QIAN Lian Fang 2 and QU Shu Ming 2 1997World Journal of Gastroenterology1997,3,2:21
4Chemical characterization of size-resolved aerosols in four seasons and hazy days in the megacity Beijing of China显示文摘Size-resolved aerosol samples were collected by MOUDI in four seasons in 2007 in Beijing. The PM10 and PM1.8mass concentrations were 166.0 ± 120.5 and 91.6 ± 69.7 μg/m^3, respectively,throughout the measurement, with seasonal variation: nearly two times higher in autumn than in summer and spring. Serious fine particle pollution occurred in winter with the PM1.8/PM10 ratio of 0.63, which was higher than other seasons. The size distribution of PM showed obvious seasonal and diurnal variation, with a smaller fine mode peak in spring and in the daytime. OM(organic matter = 1.6 × OC(organic carbon)) and SIA(secondary inorganic aerosol) were major components of fine particles, while OM, SIA and Ca_2+were major components in coarse particles. Moreover, secondary components, mainly SOA(secondary organic aerosol) and SIA,accounted for 46%–96% of each size bin in fine particles, which meant that secondary pollution existed all year. Sulfates and nitrates, primarily in the form of(NH_4)_2SO_4, NH_4NO_3, Ca SO_4, Na_2SO_4 and K_2SO_4, calculated by the model ISORROPIA II, were major components of the solid phase in fine particles. The PM concentration and size distribution were similar in the four seasons on non-haze days, while large differences occurred on haze days, which indicated seasonal variation of PM concentration and size distribution were dominated by haze days. The SIA concentrations and fractions of nearly all size bins were higher on haze days than on non-haze days, which was attributed to heterogeneous aqueous reactions on haze days in the four seasons.Kang Sun Xingang Liu Jianwei Gu Yunpeng Li Yu Qu Junling An Jingli Wang Yuanhang Zhang Min Hu Fang Zhang 2015Journal of Environmental Sciences2015,27,6:19
5Wire electrochemical machining with axial electrolyte flushing for titanium alloy显示文摘Titanium and its alloys have found very wide application in aerospace due to their excellent characteristics although their processing is still a challenge. Electrochemical machining is an important issue in the fabrication of titanium and titanium alloys. Wire electrochemical machining (WECM) is mainly used for workpiece cutting under the condition of different thickness plates. It has a great advantage over wire electro-discharge machining, which is the absence of heat-affected zone around the cutting area. Moreover, the wire electrode in WECM could be used repetitively because it is not worn out. Thus, much attention has been paid to WECM. The effective way of removing electrolysis products is of importance to WECM. In this paper, the axial electrolyte flushing is presented to WECM for removing electrolysis products and renewing electrolyte. The Taguchi experiment is conducted to optimize the machining parameters, such as wire feedrate, machining voltage, electrolyte concentration, etc. Experimental results show that WECM with axial electrolyte flushing is a promising issue in the fabrication of titanium alloy (TC1). The feasibility of multi-wire electrochemical machining is also demonstrated to improve the machining productivity of WECM.Qu Ningsong Fang Xiaolong Li Wei Zeng Yongbin Zhu Di 2013Chinese Journal of Aeronautics2013,26,1:19
6Compound heterozygous mutation in two unrelated cases of Chinese spinal muscular atrophy patients显示文摘背景婴儿的近似针的肌肉发达的萎缩(SMA ) 是普通正染色体的后退的神经与肌的混乱。从幸存马达神经原基因 1 的同型结合的删除( SMN1 )的 SMA 结果的近似90-95%盒子和5%盒子被复合异质接合的变化(另外的等位基因上的一等位基因和一个微妙的变化上的 SMN1 删除)引起在这研究的 .Methods ,二个无关的病人临床上根据近似 SMA 的标准被诊断。基因诊断被执行检测 exon 的同型结合的删除由 PCR 限制碎片长度多型性(RFLP ) 和定序的 genomic 的 7 SMN1。复合结扎依赖者探查扩大(MLPA ) 分析被执行在病人测量 SMN1, SMN2 和 neuronal apoptosis 禁止者蛋白质(NAIP ) 的拷贝数字。SMN1allele 特定的 PCR (AS-PCR ) 和 SMN1 克隆的进一步的定序也被执行分析 SMN1 基因的点变化。另外,这二个家庭的家谱分析被执行识别用定序的 PCR-RFLP 和 genomic 的不一致的结果显示出的 mutation.Results 的传播 7 SMN1 和异质接合的删除分别地在 SMN1 基因与一个可疑变化伴随了的 exon 的同型结合的删除。这二个盒子的 MLPA 分析展出了一 SMN1 拷贝删除。一相同 c.863GT (p。Arg288Met ) 变化被定序 SMN1 克隆在二种情况中发现,它证实两个盒子是 SMA 复合异质接合体。形成混合 SMN (SMN2 17/SMN1 E8 ) 的显示出的部分变换由定序的克隆识别了的一个盒子和带 3 SMN2 的另一个盒子从 SMN1 暗示了完全的变换到 SMN2.Conclusion p。Arg288Met 是更多一个引起疾病的变化可以比有这个变化的一个多型性变化,和孩子有更严重的显型。QU Yu-jin SONG Fang YANG Yan-ling JIN Yu-wei BAI Jin-li 2011Chinese Medical Journal2011,,3:15
7Chemical and optical properties of aerosols and their interrelationship in winter in the megacity Shanghai of China显示文摘A field campaign on air quality was carried out in Shanghai in winter of 2012. The concentrations of NO, NO2, NOx, SO2, CO, and PM2.5increased during haze formation. The average masses of SO42-, NO3-and NH4+were 10.3, 11.7 and 6.7 μg/m3 during the haze episodes, which exceeded the average(9.2, 7.9, and 3.4 μg/m3) of these components in the non-haze days. The mean values for the aerosol scattering coefficient(b sp), aerosol absorption coefficient(b ap) and single scattering albedo(SSA) were 288.7, 27.7 and0.91 Mm-1, respectively. A bi-peak distribution was observed for the mass concentrations of CO, NO, NO2, and NOx. More sulfate was produced during daytime than that in the evening due to photochemical reactions. The mass concentration of NH4+achieved a small peak at noontime. NO3-showed lower concentrations in the afternoon and higher concentrations in the early morning. There were obvious bi-peak diurnal patterns for b sp and b ap as well as SSA. b sp and b ap showed a positive correlation with PM2.5mass concentration.(NH4)2SO4, NH4NO3, organic mass, elemental carbon and coarse mass accounted for 21.7%, 19.3%, 31.0%, 9.3% and 12.3% of the total extinction coefficient during non-haze days, and 25.6%, 24.3%, 30.1%, 8.1% and 8.2% during hazy days. Organic matter was the largest contributor to light extinction. The contribution proportions of ammonium sulfate and ammonium nitrate to light extinction were significantly higher during the hazy time than during the non-haze days.Tingting Han Liping Qiao Min Zhou Yu Qu Jianfei Du Xingang Liu Shengrong Lou Changhong Chen Hongli Wang Fang Zhang Qing Yu Qiong Wu 2015Journal of Environmental Sciences2015,27,1:14
8Control of Leaf Senescence by an MeOH- Jasmonates Cascade that Is Epigenetically Regulated by OsSRT1 in Rice显示文摘ChuanYing Fang Hua Zhang Jian Wan YangYang Wu Kang Li Cheng Jin Wei Chen ShouChuang Wang WenSheng Wang HaiWei Zhang Pan Zhang Fei Zhang LiangHuan Qu Xianqing Liu Dao-Xiu Zhou Jie Luo 2016Molecular Plant2016,9,10:14
9Multiple hypointense vessels on susceptibility-weighted imaging predict early neurological deterioration in acute ischaemic stroke patients with severe intracranial large artery stenosis or occlusion receiving intravenous thrombolysis显示文摘background and purpose Early neurological deterioration(END)is a common feature in patients with acute ischaemic stroke(AIS)receiving thrombolysis.This study aimed to investigate whether the presence of multiple hypointense vessels(MHVs)on susceptibility-weighted imaging(SWI)could predict END in patients with the anterior circulation AIS treated with recombinant tissue plasminogen activator(r-tPA).Methods This was a retrospective study focusing on AIS patients suffering from symptomatic stenosis or occlusion of the middle cerebral artery or internal carotid artery with r-tPA treatment.We collected clinical variables and initial haematological and neuroimaging findings.MHVs were measured on SWI performed after intravenous thrombosis and were defined as the presence of a greater number of veins or veins of a larger diameter with greater signal loss on SWI than those of the contralesional haemisphere.The degree of hyperintensity of MHVs was classified into four grades:none,subtle,moderate and extensive.END was defined as an increase in the National Institutes of Health Stroke Scale score by 2 points during the first 48 hours after the onset of symptoms.Multivariate logistic regressions were conducted to investigate the predictors of END.results The study included 61 patients(51 males and 10 females)with a mean age of 62.4±12.6 years.Thirty-five(57.4%)patients presented with MHVs:8(13.1%)were graded as subtle MHVs,while 23(37.7%)and 4(6.6%)were graded as moderate or extensive MHVs,respectively.Twenty patients(32.8%)presented with END.Logistic regression analysis showed that compared with patients without MHVs,moderate MHVs(adjusted OR 5.446,95%CI 1.360 to 21.800;p=0.017)and extensive MHVs(adjusted OR 15.240,95%CI 1.200 to 193.544;p=0.036)were significantly associated with END.Conclusions MHVs might be a useful predictor of END in AIS patients with symptomatic large artery stenosis or occlusion after r-tPA treatment.Yong-Lin Liu Han-Peng Yin Dong-Hai Qiu Jian-Feng Qu Huo-Hua Zhong Zhi-Hao Lu Fang Wang Man-Qiu Liang Yang-Kun Chen 2020Stroke & Vascular Neurology2020,5,4:14
10Segmentation of Hematoxylin-Eosin stained breast cancer histopathological images based on pixel-wise SVM classifier显示文摘Hematoxylin-Eosin(HE) staining is the routine diagnostic method for breast cancer(BC), and large amounts of HE stained histopathological images are available for analysis. It is emergent to develop computational methods to efficiently and objectively analyze these images, with the aim of providing potentially better diagnostic and prognostic information for BC. This work focuses on analyzing our in-house HE stained histopathological images of breast cancer tissues. Since tumor nests(TNs) and stroma morphological characteristics can reflect the biological behaviors of breast invasive ductal carcinoma(IDC), accurate segmentation of TNs and the stroma is the first step towards the subsequent quantitative analysis. We first propose a method based on the pixel-wise support vector machine(SVM) classifier for segmenting TNs and the stroma, then extract four morphological characters related to the TNs from the images and investigate their relationships with the patients' 8-year disease free survival(8-DFS). The evaluation result shows that the classification based segmentation method is able to distinguish between TNs and stroma with 87.1% accuracy and 80.2% precision,suggesting that the proposed method is promising in segmenting HE stained IDC histopathological images. The Kaplan-Meier survival curves show that three morphological characters(number of TNs, total perimeter, and average area of TNs) in the images have statistical correlations with 8-DFS of the patients, illustrating that the segmented images can help to identify new morphological factors in IDC TNs for the prediction of BC prognosis.QU AiPing CHEN JiaMei WANG LinWei YUAN JingPing YANG Fang XIANG QingMing MASKEY Ninu YANG GuiFang LIU Juan LI Yan 2015Science China(Information Sciences)2015,58,9:12
11Generation of a Hutchinson-Gilford progeria syndrome monkey model by base editing显示文摘Many human genetic diseases,including Hutchinson-Gilford progeria syndrome(HGPS),are caused by single point mutations.HGPS is a rare disorder that causes premature aging and is usually caused by a de novo point mutation in the LMNA gene.Base editors(BEs)composed of a cytidine deaminase fused to CRISPR/Cas9 nickase are highly efficient at inducing C to T base conversions in a programmable manner and can be used to generate animal disease models with single amino-acid substitutions.Here,we generated the first HGPS monkey model by delivering a BE mRNA and guide RNA(gRNA)targeting the LMNA gene via microinjection into monkey zygotes.Five out of six newborn monkeys carried the mutation specifically at the target site.HGPS monkeys expressed the toxic form of lamin A,progerin,and recapitulated the typical HGPS phenotypes including growth retardation,bone alterations,and vascular abnormalities.Thus,this monkey model genetically and clinically mimics HGPS in humans,demonstrating that the BE system can efficiently and accurately generate patient-specific disease models in non-human primates.Fang Wang Weiqi Zhang Qiaoyan Yang Yu Kang Yanling Fan Jingkuan Wei Zunpeng Liu Shaoxing Dai Hao Li Zifan Li Lizhu Xu Chu Chu Jing Qu Chenyang Si Weizhi Ji Guang-Hui Liu Chengzu Long Yuyu Niu 2020Protein & Cell2020,11,11:11
12Environmental characteristics of sandstorm of Minqin Oasis in China for recent 50 years显示文摘The purpose of this present study is to investigate the frequency and variation of sandstorm in Minqin Oasis. Using daily observational data of sandstorm and other meteorologic data from 1954 to 2000, we have illuminated the relationship between sandstorm, meteorological parameters and human activities. The results of the analysis show that the highest frequency of sandstorms occurrence and their duration mainly focus on March, April and May, especially in April. Most of sandstorms occur from midday to nightfall, but relative few appear from midnight to forenoon, which apparently correlates to the daily variations of atmospheric thermal stability within atmospheric boundary layer. Monthly mean and annual mean duration of sandstorms coincide well with the frequencies of sandstorm occurrence.ZHANG Ke-cun QU Jian-jun ZU Rui-ping FANG Hai-yan 2005Journal of Environmental Sciences2005,17,5:9
13Cerebral mechanism of puncturing at He-Mu point combination for functional dyspepsia: study protocol for a randomized controlled parallel trial显示文摘Acupuncture is widely used to treat functional dyspepsia with satisfactory outcomes. Combination of the He and Mu acupoints is commonly used and has a synergistic effect on functional dyspepsia; however, its underlying mechanisms remain unclear. Therefore, a randomized controlled parallel clinical trial is currently underway at Chengdu University of Traditional Chinese Medicine, China. This trial is designed to explore the efficacy of and central responses to the He-Mu point combination in patients with functional dyspepsia using functional magnetic resonance imaging. A total of 105 patients with functional dyspepsia will be allocated into 3 groups: the low-He point group(puncturing at Zusanli(ST36)), Mu point group(puncturing at Zhongwan(CV12)), and He-Mu point combination group(puncturing at ST36 and CV12). Every participant will receive 20 sessions of manual acupuncture for 4 weeks. The needles will be inserted perpendicularly to a depth of 1 to 2 cun. The angle of rotation and twisting will range from 90 to 180 degrees, while lifting and thrusting will range from 0.3 to 0.5 cm. The various manipulations will be performed 60 to 90 times per minute. The needles will remain in place for 30 minutes, during which manipulation will be applied every 10 minutes. Magnetic resonance imaging will be performed before and after 20 sessions of acupuncture. The primary outcome is symptom improvement according to the Chinese version of the Nepean Dyspepsia Index. Secondary outcomes include the Leeds dyspepsia questionnaire, Self-Rating Anxiety Scale, Self-Rating Depression Scale, Beck Anxiety Inventory, Beck Depression Inventory, and visual analogue scale scores before and after 10 and 20 sessions of acupuncture. Needle sensation and adverse events will be used to assess the therapeutic effects. This study will promote more widespread awareness of the benefits of acupoint combination in the clinical setting and provide a further explanation of the neuromechanism by which acupuncture at the He-Mu point combination for functional dyspepsia. Registration: Chinese Clinical Trial Registry, Chi CTR-IOR-15006402.Shuai Yin Yuan Chen Du Lei Rui-rui Sun Ting-ting Ma Pei-min Feng Zhao-xuan He Xue-ling Suo Pei-hong Ma Yu-zhu Qu Ke Qiu Miao-miao Jing Qi-yong Gong Fan-rong Liang Jiao Chen Fang Zeng 2017Neural Regeneration Research2017,12,5:9
14Surges of hospital-based rhinovirus infection during the 2020 coronavirus disease-19(COVID-19)pandemic in Beijing,China显示文摘Background A series of public health preventive measures has been widely implemented in Beijing to control the corona-virus disease-19(COVID-19)pandemic since January 2020.An evaluation of the effects of these preventive measures on the spread of other respiratory viruses is necessary.Methods Respiratory specimens collected from children with acute respiratory infections were tested by NxTAGTN,respiratory pathogen panel assays during January 2017 and December 2020.Specimens characterized as rhinoviruses(RVs)were sequenced to identify the RV species and types.Then,the epidemiology results of respiratory pathogens in 2020 were compared with those from 2017 to 2019 using SPSS statistics 22.0.Results The positive rates of adenovirus(ADV),influenza virus(flu),RVs,and respiratory syncytial virus(RSV)dropped abruptly by 86.31%,94.679c,94.59%,and 92.17%,respectively,from February to May 2020,compared with the average level in the same period during 2017-2019.Positive rates of RVs then steeply increased from June 2020(13.77%),to an apex(37.25%)in August 2020,significantly higher than the average rates(22.51%)in August 2017-2019(7^=0.005).The increase,especially in group>3 years,was accompanied by the reopening of schools and kindergartens after the 23rd and 24th week of 2020 in Beijing.Conclusions Whereas the abrupt drop in viral pathogen positive rates from February to May 2020 revealed the remarkable effects of the COVID-19 preventive measures,the sharp increase in positive rates of RVs from the 23rd week of 2020 might be explained by the reopening of schools and kindergartens in Beijing.Ruo-Xi Zhang Dong-Mei Chen Yuan Qian Yu Sun Ru-Nan Zhu Fang Wang Ya-Xin Ding Qi Guo Yu-Tong Zhou Dong Qu Ling Cao Chun-Mei Zhu Lin-Qing Zhao 2021World Journal of Pediatrics2021,17,6:9
15In situ detection of tumor infiltrating lymphocytes expressing perforin and fas-ligand genes in human HCC显示文摘NTRODUCTIONCytotoxicTlymphocytes(CTLs)playamajorroleinkilingtumorcels.Twopathwayshavebeendescribedbywhichacytotoxiccelmayind...QIAN Qi Jun, XUE Hui Bin, QU Zeng Qiang, FANG Shi Gang, CAO Hui Fang and WU Meng Chao 1999World Journal of Gastroenterology1999,5,1:7
16A Brief Review on the Human Encyclopedia of DNA Elements (ENCODE) Project显示文摘The ENCyclopedia Of DNA Elements (ENCODE) project is an international research consortium that aims to identify all functional elements in the human genome sequence. The second phase of the project comprised 1640 datasets from 147 different cell types, yielding a set of 30 publications across several journals. These data revealed that 80.4% of the human genome displays some functionality in at least one cell type. Many of these regulatory elements are physically associated with one another and further form a network or three-dimensional conformation to affect gene expression. These elements are also related to sequence variants associated with diseases or traits. All these findings provide us new insights into the organization and regulation of genes and genome, and serve as an expansive resource for understanding human health and disease.Hongzhu Qu Xiangdong Fang 2013Genomics, Proteomics & Bioinformatics2013,11,3:7
17Os isotope dating and growth hiatuses of Co-rich crust from central Pacific显示文摘Up to now, accurate determination of the growth age and hiatuses of the Co-rich crust is still a difficult work, which constrains the researches on the genesis, growth process, controlling factors, regional tectonics, paleo-oceanographic background, etc. of the Co-rich crust. This paper describes our work in determining the initial growth age of the Co-rich crust to be of the late Cretaceous Campanian Stage (about 75-80 Ma), by selecting the Co-rich crust with clear multi-layer structures in a central Pacific seamount for layer-by-layer sample analysis and using a number of chronological methods, such as Co flux dating, dating by correlation with 187Os/188Os evolution curves of seawater, and stratigraphic divi- sion by calcareous nannofossils. We have also discovered growth hiatuses with different time intervals in the early Paleocene, middle Eocene, late Eocene and early-middle Miocene, respectively. These re- sults have provided an important age background for further researches on the Co-rich crust growth process and the paleo-oceanographic environment evolution thereby revealed in the said region.LI JiangShan FANG NianQiao QU WenJun DING Xuan GAO LianFeng WU ChangHang ZHANG ZhenGuo 2008Science China Earth Sciences2008,51,10:6
18Reflux symptom questionnaire in the diagnosis of reflux oesophagitis显示文摘Reflux symptom questionnaire(RSQ)is a useful toolin epidemiological study of gastroesophageal refluxdisease(GERD),but the correlation between RSQ andthe reflux oesophagitis(RE)is still unclear.Weinvestigated the gastroesophageal reflux symptoms andendoscopic findings in farmers in Yantai area ofShandong Province,China,and evaluated RSQ in thediagnosis of RE.CLINICAL DATASubjectsDuring May 2006,556 adults in rural area of Yantai,Shandong Province were enrolled in this investigation;ZHANG Li ZHOU Li-ya LIN San-ren DING Shi-gang HUANG Yong-hui GU Fang LI Yuan ZHANG Jing YAN Xiu-e MENG Ling-mei ZHANG Dong-hong HUANG Shu-mei QU Xue-fu 2007Chinese Medical Journal2007,,23:6
19Development and prospect of direct‐current circuit breaker in China显示文摘The direct‐current circuit breaker(DCCB)is the most ideal choice for DC fault isolation in DC grids.Despite a late start,China's research and development on the DCCB have made outstanding achievements.This article provides a brief glance of current China's DCCB development status.It begins by sorting out the technical route according to the topology of DCCB.Then it systematically summarises both mechanical and hybrid DCCBs with focussing on the aspects of topology structure and principle,key technology and characteristics,prototype development and application.It is apparent that Chinese scientists and engineers confronted the worldwide problem of large capacity DC breaking,and put forward a comprehensive solution which consists of an innovative topology structure based on coupled negative voltage circuit,breaking throughs on the key technologies such as highly controllable and reliable fault current commutation,millisecond‐level ultra‐fast and efficient electromagnetic repulsion mechanism,high tolerance and high stability power electronic switch,low residual voltage and fast response energy consumption device,etc.The article states that the world's first set of hybrid high‐voltage(HV)DCCB,and the first set of mechanical HV DCCB have been developed.These DCCBs will soon be deployed to the DC grids which have the highest voltage levels therefore require the strongest breaking capacity.These achievements are leading the world in the development and application of DCCB.The article also discusses the overall development trends of DCCB in the areas of new topologies,key techno-logical breakthroughs and application scenarios,etc.These discussions serve as references for DCCB's future technological advancement and its ever‐expanding applications.Weijiang Chen Rong Zeng Junjia He Yi Wu Xiaoguang Wei Taixun Fang Zhanqing Yu Zhao Yuan Yifei Wu Wandi Zhou Bing Yang Lu Qu 2021High Voltage2021,6,1:6
20Plasma ghrelin levels are closely associated with severity and morphology of angiographically-detected coronary atherosclerosis in Chinese patients with diabetes mellitus显示文摘Min ZHANG Wei-yi FANG Fang YUAN Xin-kai QU Hua LIU Ying-jia XU Hui CHEN Yong-fu YU Yan SHEN Zhi-chun ZHENG 2012Acta Pharmacologica Sinica2012,33,4:6
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