维普中文期刊产品整合服务
445篇 您的检索式:作者名="Pang Lin"
    题名 作者 年代 出处 被引量
12018 Chinese Pediatric Cardiology Society(CPCS) guideline for diagnosis and treatment of syncope in children and adolescents显示文摘Syncope belongs to the transient loss of consciousness(TLOC), characterized by a rapid onset, short duration, and spontaneous complete recovery. It is common in children and adolescents, accounting for 1% to 2% of emergency department visits.Recurrent syncope can seriously affect children's physical and mental health, learning ability and quality of life and sometimes cardiac syncope even poses a risk of sudden death. The present guideline for the diagnosis and treatment of syncope in children and adolescents was developed for guiding a better clinical management of pediatric syncope. Based on the globally recent development and the evidence-based data in China, 2018 Chinese Pediatric Cardiology Society(CPCS) guideline for diagnosis and treatment of syncope in children and adolescents was jointly prepared by the Pediatric Cardiology Society, Chinese Pediatric Society, Chinese Medical Association(CMA)/Committee on Pediatric Syncope, Pediatricians Branch, Chinese Medical Doctor Association(CMDA)/Committee on Pediatric Cardiology, Chinese College of Cardiovascular Physicians, Chinese Medical Doctor Association(CMDA)/Pediatric Cardiology Society, Beijing Pediatric Society, Beijing Medical Association(BMA). The present guideline includes the underlying diseases of syncope in children and adolescents, the diagnostic procedures, methodology and clinical significance of standing test and headup tilt test, the clinical diagnosis vasovagal syncope, postural orthostatic tachycardia syndrome, orthostatic hypotension and orthostatic hypertension, and the treatment of syncope as well as follow-up.Cheng Wang Yaqi Li Ying Liao Hong Tian Min Huang Xiangyu Dong Lin Shi Jinghui Sun Hongfang Jin Junbao Du Jindou An Jie Chen Mingwu Chen Qi Chen Sun Chen Yonghong Chen Zhi Chen Adolphus Kai-tung Chau Junbao Du Zhongdong Du Junkai Duan Hongyu Duan Xiangyu Dong Lin Feng Lijun Fu Fangqi Gong Yonghao Gui Ling Han Zhenhui Han Bing He Zhixu He Xiufen Hu Yimin Hua Guoying Huang Min Huang Ping Huang Yujuan Huang Hongfang Jin Mei Jin Bo Li Fen Li Tao Li Xiaohui Li Xiaoyan Liu Yan Li Haitao Lv Tiewei Lv Zipu Li Luyi Ma Silin Pan Yusheng Pang Hua Peng Yuming Qin Jie Shen Lin Shi Kun Sun Jinghui Sun Hong Tian Jie Tian Cheng Wang Hong Wang Lei Wang Jinju Wang Wendi Wang Yuli Wang Rongzhou Wu Tianhe Xia Yanyan Xiao Chunhong Xie Yanlin Xing Zhenyu Xiong Baoyuan Xu Yi Xu Hui Yan Shiwei Yang Qijian Yi Xia Yu Xianyi Yu Yue Yuan Hongyan Zhang Huili Zhang Li Zhang Qingyou Zhang Xi Zhang Yanmin Zhang Zhiwei Zhang Cuifen Zhao Bin Zhou Hua Zhu 2018Science Bulletin2018,63,23:54
2Cold-chain food contamination as the possible origin of COVID-19 resurgence in Beijing显示文摘COVID-19,caused by SARS-CoV-2[1,2],has been contained in China through stringent non-pharmaceutical interventions.Border control and quarantine have effectively prevented the virus from being spread by infected travellers,but the risk of resurgence caused by other routes of introduction and transmission remains unclear,and current strategies to prevent resurgence could be flawed.Since July,SARS-CoV-2 RNA contaminations in frozen food imported from countries with ongoing epidemics have been reported in nine provinces in China[3,4].However,there is no robust evidence of COVID-19 outbreaks initiated by environmentto-human transmission.Here we add to evidence of such transmission by investigating the recent COVID-19 resurgence in Beijing.Xinghuo Pang Lili Ren Shuangsheng Wu Wentai Ma Jian Yang Lin Di Jie Li Yan Xiao Lu Kang Shichang Du Jing Du Jing Wang Gang Li Shuguang Zhai Lijuan Chen Wenxiong Zhou Shengjie Lai Lei Gao Yang Pan Quanyi Wang Mingkun Li Jianbin Wang Yanyi Huang Jianwei Wang COVID-19 Field Response Group COVID-19 Laboratory Testing Group 2020National Science Review2020,7,12:51
3The role of magmatism in the thinning and breakup of the South China Sea continental margin显示文摘INTRODUCTION Magmatism plays a key role in the process of continental margin breakup and ocean formation.Even in the extremely magma-poor Iberia and Newfoundland margin,studies of field outcrops have shown that syn-rift magmatism had participated in rifting from a very early stage and contributed directly to the rifting process.The final transition from exhumed continental mantle to the ocean formation is also triggered by the accumulation and eruption of magma[1].Zhen Sun Jian Lin Ning Qiu Zhimin Jian PinXian Wang Xiong Pang Jinyun Zheng Benduo Zhu 2019National Science Review2019,6,5:34
4Mapping the vegetation distribution of the permafrost zone on the Qinghai-Tibet Plateau显示文摘In this paper,an updated vegetation map of the permafrost zone in the Qinghai-Tibet Plateau(QTP) was delineated.The vegetation map model was extracted from vegetation sampling with remote sensing(RS) datasets by decision tree method.The spatial resolution of the map is 1 km×1 km,and in it the alpine swamp meadow is firstly distinguished in the high-altitude areas.The results showed that the total vegetated area in the permafrost zone of the QTP is 1,201,751 km^2.In the vegetated region,50,260 km^2 is the areas of alpine swamp meadow,583,909 km^2 for alpine meadow,332,754 km^2 for alpine steppe,and 234,828 km^2 for alpine desert.This updated vegetation map in permafrost zone of QTP could provide more details about the distribution of alpine vegetation types for studying the vegetation mechanisms in the land surface processes of highaltitude areas.WANG Zhi-wei WANG Qian ZHAO Lin WU Xiao-dong YUE Guang-yang ZOU De-fu NAN Zhuo-tong LIU Guang-yue PANG Qiang-qiang FANG Hong-bing WU Tong-hua SHI Jian-zong JIAO Ke-qin ZHAO Yong-hua ZHANG Le-le 2016Journal of Mountain Science2016,13,6:26
5A broadband achromatic metalens array for integral imaging in the visible显示文摘Integral imaging is a promising three-dimensional(3D)imaging technique that captures and reconstructs light field information.Microlens arrays are usually used for the reconstruction process to display 3D scenes to the viewer.However,the inherent chromatic aberration of the microlens array reduces the viewing quality,and thus,broadband achromatic imaging remains a challenge for integral imaging.Here,we realize a silicon nitride metalens array in the visible region that can be used to reconstruct 3D optical scenes in the achromatic integral imaging for white light.The metalens array contains 60×60 polarization-insensitive metalenses with nearly diffraction-limited focusing.The nanoposts in each high-efficiency(measured as 47%on average)metalens are delicately designed with zero effective material dispersion and an effective achromatic refractive index distribution from 430 to 780 nm.In addition,such an achromatic metalens array is composed of only a single silicon nitride layer with an ultrathin thickness of 400 nm,making the array suitable for on-chip hybrid-CMOS integration and the parallel manipulation of optoelectronic information.We expect these findings to provide possibilities for full-color and aberration-free integral imaging,and we envision that the proposed approach may be potentially applicable in the fields of high-power microlithography,high-precision wavefront sensors,virtual/augmented reality and 3D imaging.Zhi-Bin Fan Hao-Yang Qiu Han-Le Zhang Xiao-Ning Pang Li-Dan Zhou Lin Liu Hui Ren Qiong-Hua Wang Jian-Wen Dong 2019Light(Science & Applications)2019,8,1:21
6Special Section:SARS-CoV-2 Preliminary evidence from a multicenter prospective observational study of the safety and efficacy of chloroquine for the treatment of COVID-19显示文摘Effective therapies are urgently needed for the SARS-CoV-2 pandemic.Chloroquine has been proved to have antiviral effect against coronavirus in vitro.In this study,we aimed to assess the efficacy and safety of chloroquine with different doses in COVID-19.In this multicenter prospective observational study,we enrolled patients older than 18 years old with confirmed SARS-CoV-2 infection excluding critical cases from 12 hospitals in Guangdong and Hubei Provinces.Eligible patients received chloroquinephosphate s00 mg,orally,once(half dose)or twice(full dose)daily.Patients treated with non-chloroquine therapy were included as historical controls.The primary endpoint is the time to undetectable viral RNA.Secondary outcomes include the proportion of patients with undetectable viral RNA by day 10 and 14,hospitalization time,duration of fever,and adverse events.A total of 197 patients completed chloroquine treatment,and 176patients were included as historical controls.The median time to achieve an undetectable viral RNA was shorter in chloroquine than in non-chloroquine(absolute difference in medians-6.0 days;95%CI-6.0 to—4.0).The duration of fever is shorter in chloroquine(geometric mean ratio 0.6;95%CIO.5 to 0.8).No serious adverse events were observed in the chloroquine group.Patients treated with half dose experienced lower rate of adverse events than with full dose.Although randomized trials are needed for further evaluation,this study provides evidence for safety and efficacy of chloroquine in COVID-19 and suggests that chloroquine can be a cost-effective therapy for combating the COVID-19 pandemic.Mingxing Huang Man Li Fei Xiao Pengfei Pang Jiabi Liang Tiantian Tang Shaoxuan Liu Binghui Chen Jingxian Shu Yingying You Yang Li Meiwen Tang Jianhui Zhou Guanmin Jiang Jingfen Xiang Wenxin Hong Songmei He Zhaoqin Wang Jianhua Feng Changqing Lin Yinong Ye Zhilong Wu Yaocai Li Bei Zhong Ruilin Sun Zhongsi Hong Jing Liu Huili Chen Xiaohua Wang Zhonghe Li Duanqing Pei Lin Tian Jinyu Xia Shanping Jiang Nanshan Zhong Hong Shan 2020National Science Review2020,7,9:20
7GENERALIZED NEKRASOV MATRICES AND APPLICATIONS显示文摘In this paper,the concpet of generalized Nekrasov matrices in introduced,some prop-erties of these matrices are discussed,obtained equivalent representation of generalized diagonally dominant matrices.Mingxian Pang Zhuxiang Li (Dept. of Math, of Normal college, Beihua University, Ji Lin 132013, China) 2003Journal of Computational Mathematics2003,21,2:19
8Is frailty associated with short-term outcomes for elderly patients with acute coronary syndrome?显示文摘BackgroundFrailty 由于老化并且逐渐地是在心血管的药的一个新预示的因素老病人的复杂自然。有希望地分析在哪个脆弱与 .MethodsPatients 变老的急性冠的症候群(交流) 为老病人预言短期的结果的方式有用、有意义 ≥65 年,与从心病学的交流的诊断,部门和医学部门被包括从单个中心。包括医学症候群的临床的数据用全面医学评价被收集。脆弱根据临床的脆弱规模被定义,风险上的合作病态的影响被冠的动脉疾病(CAD ) 确定 —特定的索引。病人们被跟随在上面由临床的访问或电话,咨询和中部的后续时间是 120 天。后面起来项目包括了所有原因死亡, unscheduled 回来访问,在里面医院和周期性的主要不利心血管的事件。Multivariable 回归幸存分析用考克斯 regression.ResultsOf 被执行 352 个病人,(43.18%) 152 根据学习仪器被认为脆弱(5 − 7 在规模上) ,并且(26.42%) 93 中等或严重地被考虑脆弱(6 − 7 在规模上) 。包括不能自制,秋天历史,视觉缺陷,听觉缺陷,便秘,长期的疼痛,睡觉混乱,牙齿的问题,焦虑或消沉的医学症候群,和谵妄比在非脆弱的病人更经常在脆弱的病人( P = 0.000 , 0.031 , 0.009 , 0.014 , 0.000 , 0.003 , 0.022 , 0.000 , 0.074 ,和 0.432 ,分别地)。为性别调整了,年龄,冠的动脉疾病的严厉(离开了主要冠的动脉损害) 并且由考克斯幸存分析的合作病态(CAD 特定的索引) ,脆弱被发现到强烈并且独立地为主要合成结果与风险被联系:所有原因死亡[危险比率(HR )= 5.393;95% CI:1.477 − 19.692, P = 0.011 ] 并且 unscheduled 回来访问(HR = 2.832;95% CI:1.140 − 7.037, P = 0.025 ).ConclusionsComprehensive 医学评价和临床的脆弱的规模在有交流的老病人的评估是有用的。脆弱强烈并且独立地与交流为老病人与短期的结果被联系。Lin KANG Shu-Yang ZHANG Wen-Ling ZHU Hai-Yu PANG Li ZHANG Ming-Lei ZHU Xiao-Hong LIU Yong-Tai LIU 2015Journal of Geriatric Cardiology2015,12,6:16
9Grape Seed Proanthocyanidin Extract Alleviates Arsenic-induced Oxidative Reproductive Toxicity in Male Mice显示文摘Objective To determine the ability of grape seed proanthocyanidin extract(GSPE) in alleviating arsenic-induced reproductive toxicity. Methods Sixty male Kunming mice received the following treatments by gavage: normal saline solution(control); arsenic trioxide(ATO; 4 mg/kg); GSPE(400 mg/kg); ATO+GSPE(100 mg/kg); ATO+GSPE(200 mg/kg) and ATO+GSPE(400 mg/kg). Thereafter, the mice were sacrificed and weighed, and the testis was examined for pathological changes. Nuclear factor(erythroid-derived 2)-like 2(Nrf2), heme oxygenase 1(HO1), glutathione S-transferase(GST), NAD(P)H dehydrogenase, and quinone 1(NQO1) expression in the testis was detected by real-time PCR. Superoxide dismutase(SOD), glutathione(GSH), total antioxidative capability(T-AOC), malondialdehyde(MDA), 8-hydroxydeoxyguanosine(8-OHd G), and reproductive indexes were analyzed. Results ATO-treated mice showed a significantly decreased sperm count and testis somatic index and activity levels of SOD, GSH, and T-AOC than control group. Compared to the ATO-treated group, ATO +GSPE group showed recovery of the measured parameters. Mice treated with ATO+high-dose GSPE showed the highest level of m RNA expression of Nrf2, HO, NQO1, and GST. Conclusion GSPE alleviates oxidative stress damage in mouse testis by activating Nrf2 signaling, thus counteracting arsenic-induced reproductive toxicity.LI Shu Gang DING Yu Song NIU Qiang XU Shang Zhi PANG Li Juan MA Ru Lin JING Ming Xia FENG Gang Ling LIU Jia Ming GUO Shu Xia 2015Biomedical and Environmental Sciences2015,28,4:14
10Genipin inhibits endothelial exocytosis via nitric oxide in cultured human umbilical vein endothelial cells显示文摘Guang-fa WANG Shao-yu WU Jin-jun RAO Lin LV Wei XU Jian-xin PANG Zhong-qiu LIU Shu-guang WU Jia-jie ZHANG 2009Acta Pharmacologica Sinica2009,30,5:13
11Changes in aortic endothelium ultrastructure in male rats following castration, replacement with testosterone and administration of 50α-reductase inhibitor显示文摘瞄准:调查在低雄激素水平和脉管的内皮细胞层的超微结构之间的关系。方法:48 只男 Sprague-Dawley 老鼠随机被划分成四个组:组 A,有假冒的阉割的正常老鼠;组 B,阉割的老鼠;组 C,给睾丸激素(T) undecanoate 的阉割的老鼠;并且组织 D,与 5 α - reductase 禁止者对待的未经触动的老鼠。在 10 星期处理或阉割以后,在不同的组的老鼠被打死,浆液 T,免费 T (英尺) 和 dihydrotestosterone (DHT ) 被测量。大动脉的 endothelia 在电子缩微本下面被扫描,脉管的内皮细胞层结构分数(VESS ) 被计算。结果:在组 B 的老鼠的浆液 T 和英尺集中是比另外的三个组的那些显著地低的(P < 0.01 ) ;组 D 老鼠的 DHT 集中显著地被减少(P < 0.01 ) 什么时候与那些相比组 A 和 C。在组 B 和 D 老鼠的老鼠(与低雄激素层次) 他们的 endothelial 表面的有的明显的损坏,它出现了成波形,不平,粘合剂并且破裂,并且有 VESS 的高破坏。结论:这些结果建议 T 和 DHT 的低集中在雄的老鼠与大动脉的 endothelia 的极端结构的损坏被联系。Ying-Li Lu Lin Kuang Hui Zhu Hui Wu Xue-Fang Wang Yu-Ping Pang Ning-Jian Wang Dan-Lu Yu 2007Asian Journal of Andrology2007,9,6:13
12Multicenter Evaluation of the Molecular Line Probe Assay for Multidrug Resistant Mycobacterium Tuberculosis Detection in China显示文摘In order to evaluate the performance of a molecular Hain line probe assay(Hain LPA)for rapid detection of rifampicin and isoniazid resistance of Mycobacterium tuberculosis in China。LI Qiang DONG Hai Yan PANG Yu XIA Hui OU Xi Chao ZHANG Zhi Ying LI Jun Chen ZHANG Jian Kang HUAN Shi Tong CHIN Daniel P KAM Kai Man ZHAO Yan Lin 2015Biomedical and Environmental Sciences2015,28,6:13
13Classification of Complex Reservoirs in Superimposed Basins of Western China显示文摘许多通过重叠在西方的中国的沉积的盆被形成并且混合至少二以前开发了沉积的盆,一般来说,他们能作为复杂的附加的盆被称为。这些盆和单型盆之间的不同差别是他们在地质的历史上的不连续的 stratigraphic 沉积, stratigraphic 结构和 stratigraphic 压力紧张行动。在结构的节上基于按年代先后的年龄的关联,附加的盆能在这研究被划分成五种类型:(1 ) 连续沉积类型附加了盆,(2 ) 中间、迟了的 stratigraphic 附加了盆,(3 ) 早、迟了的 stratigraphic 附加了盆,(4 ) 早、中间的 stratigraphic 附加了盆,并且(5 ) 长期的暴露的附加的盆。多重 source-reservoir-caprock 集合在如此的盆发展了。另外,多级式的烃产生和逐出,多重来源,多不的烃累积和多重类型的烃水库调整,改革和破坏发生在这些盆。在附加的盆广泛地被发现了到日期的复杂水库从这的原因正在合拢的主要水库,和根有显著地不同的地质的特征,剥光和破裂效果象联系渗出物一样在附加的盆由多相的构造事件引起了,散开,掉下,氧化,降级并且裂开。基于他们的开始特征,复杂水库被划分成五个范畴:(1 ) 主要水库,(2 ) 套住调整类型水库,(3 ) 部件变体水库,(4 ) 分阶段执行变换类型水库并且(5 ) 改革规模的水库。PANG Xiongqi ZHOU Xinyuan LIN Changsong HUO Zhipeng LUO Xiaorong PANG Hong 2010Acta Geologica Sinica(English Edition)2010,84,5:11
14Necking of Q&P Steel during Uniaxial Tensile Test with the Aid of DIC Technique显示文摘A lot of research has been focused on the necking process during the plastic deformation of sheet metals, but the localized necking is rarely distinguished form diffused necking by experiments, due to the limit of measurement equipment and method. Quenching and Partitioning (Q&P) steel is a 3rd generation advanced high strength steel (AHSS). Its good combination of high strength and ductility ensures potential application in automobile industry. Uniaxial tensile tests of QP980 steel sheet at five strain rates are performed to investigate the necking process and the effect of strain rate on necking behavior of Q&P steel. Digital image correlation (DIC) method is applied during tensile tests, and evolutions of major strain, minor strain and normal strain distributions along gauge section of the tensile specimens are obtained. The diffused and localized necking strains are determined according to SWIFT necking theory and HILL necking theory respectively. The test results indicate that with the increasing of strain rate in the investigated range, the diffused necking strain decreases from 0.152 to 0.120 and localized necking strain decreases from 0.245 to 0.137. Meanwhile, the difference of the two strains decreases form 0.096 to 0.017. Thus it can be concluded that strain rate has an influence on both necking strains during the deformation of QP980 steel sheet. Diffused and localized necking strains are determined by uniaxial tensile tests with the aid of DIC technique and the effect of strain rate on necking strains is evaluated.DING Lei LIN Jianping MIN Junying PANG Zheng YE You 2013Chinese Journal of Mechanical Engineering2013,26,3:11
15Epidemiological Analysis on Reported Hepatitis C Cases in China from 2012 to 2016显示文摘Viralhepatitisisanimportantchallengeto publichealthworldwide.AshepatitisBiswell controlledduetovaccination,thediseaseburden causedbythespreadofhepatitisChasbecome increasinglyprominent.HepatitisCisaninfectious diseasethatismainlyblood-borne.Therateof chronicity ranges from 55%to 85%after people are infected with the hepatitis C virus (HCV)[1-2]. Twenty yearsafterinfectioninthegeneralpopulation,the incidence of cirrhosis ranges from 5%to 15%[3].HEI Fa Xin YE Shao Dong DING Guo Wei PANG Lin WANG Xiao Chun LIU Zhong Fu 2018Biomedical and Environmental Sciences2018,31,10:10
16First proof-of-principle experiment with the post-accelerated isotope separator on-line beam at BRIF:measurement of the angular distribution of ^(23)Na+^(40)Ca elastic scattering显示文摘The reaction dynamics of exotic nuclei near the drip line is one of the main research topics of current interest.Elastic scattering is a useful probe for investigating the size and surface diffuseness of exotic nuclei.The development of rare isotope accelerators offers opportunities for such studies.To date,many relevant measurements have been performed at accelerators using the projectile fragmentation technique,while the measurements at accelerators using isotope separator on-line(ISOL)systems are still quite scarce.In this work,we present the first proof-of-principle experiment with a post-accelerated ISOL beam at the Beijing Radioactive Ion Beam Facility(BRIF)by measuring the angular distribution of elastic scattering for the stable nucleus^(23)Na from the doubly magic nucleus^(40)Ca at energies above the Coulomb barrier.The angular distribution measured by a silicon strip detector array in a scattering chamber using the ISOL beam at BRIF is in good agreement with that measured by the high-precision Q3 D magnetic spectrograph using the nonISOL beam at nearly the same energy.This work provides useful background for making BRIF a powerful tool for the investigation of the reaction dynamics of exotic nuclei.Wei Nan Bing Guo Cheng-Jian Lin Lei Yang Dong-Xi Wang Yang-Ping Shen Bing Tang Bao-Qun Cui Tao Ge Yin-Long Lyu Hui-Ming Jia Yun-Ju Li Chen Chen Li-Hua Chen Qi-Wen Fan Xin-Yue Li Gang Lian Jian-Cheng Liu Tian-Peng Luo Nan-Ru Ma Rui-Gang Ma Xie Ma Ying-Jun Ma Wei-Ke Nan Dan-Yang Pang You-Bao Wang Pei-Wei Wen Feng Yang Yong-Jin Yao Sheng Zeng Hao Zhang Fu-Peng Zhong Shan-Hao Zhong Zhi-Hong Li Tian-Jue Zhang Wei-Ping Liu BRIF Collaboration 2021Nuclear Science and Techniques2021,32,5:9
17The cross-sectional and longitudinal association of the BODE index with quality of life in patients with chronic obstructive pulmonary disease显示文摘背景身体团索引,气流阻塞,呼吸困难,和锻练能力(预示)索引在与 COPD 在病人之中预言死亡,恶化和疾病严厉的风险被显示出,但是很少研究验证了在之间的关系在中国 COPD 病人之中预示索引和生活( HRQoL )优秀的联系的健康。这研究的目的是评估在之间的关系在代表性、纵的协会 analyses.Methods 预示索引和 HRQoL 一个多中心未来的队学习开始在北京在 491 个稳定的 COPD 病人被进行, China.Health 地位(HRQoL ) 被圣乔治的呼吸问询表(SGRQ ) 估计;BODE 索引为每个病人被计算;呼吸困难用 5 等级被估计医药研究委员会呼吸困难规模。包括的另外的大小 socio 人口统计,身体团索引(BMI ) ,肺函数测试和 6-minute-walk 测试(6MWT ) 。病人们然后每月被跟随 12 个月。结果仅仅 450 个病人完成了 1 年列在后面在上面并且在我们的现在的分析被注册。吝啬的年龄是(65.2 慦桳潩吗?LIN Ying-xiang XU Wan-ning LIANG Li-rong PANG Bao-sen NIE Xiu-hong ZHANG Jie WANG Hong LIU Yu-xiang WANG Dan-qi XU Zhen-yang WANG Hong-wu ZHANG Hu-sheng HE Zheng-yi YANG Ting WANG Chen 2009Chinese Medical Journal2009,,24:9
18Preliminary analysis of spatiotemporal pattern of global land surface water显示文摘Land surface water(LSW) is one of the most important resources for human survival and development, and it is also a main component of global water recycling. A full understanding of the spatial distribution of land surface water and a continuous measuring of its dynamics can support to diagnose the global ecosystem and environment. Based on the Global Land 30-water 2000 and Global Land 30-water 2010 products, this research analyzed the spatial distribution pattern and temporal fluctuation of land surface water under scale-levels of global, latitude and longitude, continents, and climate zones. The Global Land 30-water products were corrected the temporal inconsistency of original remotely sensed data using MODIS time-series data, and then calculated the indices such as water area, water ration and coefficient of spatial variation for further analysis. Results show that total water area of land surface is about 3.68 million km2(2010), and occupies 2.73% of land area. The spatial distribution of land surface water is extremely uneven and is gathered mainly in mid- to high-latitude area of the Northern Hemisphere and tropic area. The comparison of water ratio between 2000 and 2010 indicates the overall fluctuation is small but spatially differentiated. The Global Land 30-water products and the statistics provided the fundamental information for analyzing the spatial distribution pattern and temporal fluctuation of land surface water and diagnosing the global ecosystem and environment.CAO Xin CHEN Jun CHEN LiJun LIAO AnPing SUN FangDi LI Yang LI Lei LIN ZhongHui PANG ZhiGuo CHEN Jin HE ChaoYing PENG Shu 2014Science China Earth Sciences2014,57,10:8
19Prognostic significance of preoperative platelet count in patients with gallbladder cancer显示文摘AIM:To investigate the prognostic value of preoperative platelet count(PLT) in patients with primary gallbladder cancer(GBC).METHODS:The clinical data of 223 GBC patients after surgery was retrospectively reviewed.A receiver operating characteristic(ROC) curve was plotted to verify the optimum cutoff point for PLT.Univariate and multivariate survival analyses were performed to identify the factors associated with the prognosis.RESULTS:The ROC curve showed that the optimum cutoff point for PLT was 178 × 109/L,and the entire cohort was stratified into group A with PLT > 178 × 109/L and group B with PLT ≤ 178 × 109/L.Group A had a better survival than group B(P < 0.001).There was an obvious difference between the two groups in terms of the differentiation degree,advanced tumor stage,lymph node metastasis(P < 0.001) and pathological type(P < 0.05).The univariate analysis demonstrated that tumor location,differentiation degree,TNM stage,Nevin stage,lymph node metastasis and PLT were associated with overall survival(P < 0.001).In the multivariate analysis,PLT(P = 0.032),lymph node metastasis(P = 0.007),tumor location(P < 0.001) and TNM stage(P = 0.005) were independent prognostic factors.CONCLUSION:PLT is closely correlated with GBC prognosis and could be used to identify the population with a poorer prognosis after surgery.Rui-Tao Wang Ling-Qiang Zhang Yi-Ping Mu Jian-Bo Li Xin-Sen Xu Qing Pang Lian-Kang Sun Xing Zhang Shun-Bin Dong Lin Wang Chang Liu 2015World Journal of Gastroenterology2015,21,17:8
20Regional eco-efficiency evaluation and spatial pattern analysis of the Yangtze River Economic Zone显示文摘The environmental ecology of the Yangtze River Economic Zone(YREZ)faces ecological function decline,deterioration and degradation under intense human activities,long-term development and utilization and its economy has developed rapidly over recent decades.Eco-efficiency is considered as a measure of coordinated development of economy,resources,environment and ecology,and is currently considered a very important issue.In this paper,based on the slack-based measure and data envelope analysis model,we take 129 prefecture-level cities of the YREZ as the study unit and measure the eco-efficiency of the YREZ in 2000,2005,2010 and 2015,which considers undesired output.The evaluation of the status quo of the regional eco-efficiency development was carried out at provincial,prefectural and city scales.The spatial autocorrelation test model and standard deviation ellipse were used to analyze the spatially distributed characteristics and the evolutionary regularity of eco-efficiency.Our study suggested that the eco-efficiency value varied significantly at different spatiotemporal scales and the overall distribution presented an'N-shaped'pattern,the value is the largest downstream and the smallest upstream.Regional eco-efficiency presented certain volatility in growth and a clear spatial positive agglomeration trend from 2000 to 2015.The spatial distribution of each agglomeration area was also significantly different,forming some high-high agglomeration areas at the center of the shaft with Shanghai and surrounding cities,and some low-low agglomeration areas at the center with middle reaches and upstream cities.The low-high over-aggregation and high-low polarization clusters were fewer.At the same time,with the change of the research period,the degree of positive agglomeration became increasingly pronounced and the eco-efficiency gap of the neighborhoodunit reduced.The regional eco-efficiency value of the YREZ presented a spatial distribution pattern in the northeast-southwest axis and the evolutionary pattern of the regional eco-efficiency similarly showed a northeast-southwest orientation.HA Lin TU Jianjun YANG Jianping XU Chunhai PANG Jiaxing LU Debin YAO Zuolin ZHAO Wenyu 2020Journal of Geographical Sciences2020,30,7:8
返回顶部 每页显示:
共23页 首页 上一页 第1页 下一页 末页 /23 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费