维普中文期刊产品整合服务
133篇 您的检索式:作者名="Xiaoping Xia"
    题名 作者 年代 出处 被引量
1What Happened in the Trans-North China Orogen in the Period 2560-1850 Ma?显示文摘Trans 北方中国造山带(TNCO ) 是东方、西方的块沿着混合了形成一个协调 NorthChina 古地台(NCC ) 的一条 Paleoproterozic continent-continentcollisional 带。最近地质,结构,有在东方块的西方的边缘下面的海洋的岩石圈的东方指导俯冲的 geochemical 和 theorogen 沿着东方块的西方的边缘是大陆人边缘或日本类型弧的同位素的数据表演,由旧海洋与西方的块被分开,。在 2550-2520 妈, deepsubduction 引起了媒介降低的外壳的部分融化,生产被侵入进形成 granitoid plutons 在的外壳的上面的层次的丰富的 granitoid 岩浆低 --tomedium 等级花岗石绿岩岩层。在 2530-2520 妈,海洋的岩石圈的俯冲引起了披风楔的部分融化,它在弧在下地壳和普遍 mafic 和次要的 felsic 火山作用在 mafic 岩浆的 plating 下面导致了,形成绿岩集合的部分。普遍 mafic 驾驶到 felsic 火山作用的扩展在造山带导致了发展 ofback 弧或 intra 弧盆。在 2520-2475 妈,俯冲引起了形成大量 tonalitic-trondhjemitic-granodioritic (TTG ) 的下地壳的进一步偏爱的融化岩浆酌。背弧盆的在这时候后面的进一步的扩展,阵发性的 granitoidmagmatism 发生了,导致 2360 妈,的炮兵阵地~ 2 250 妈 2110-21760 妈和~ 2 在造山带的 050 Magranites。当代的火山沉积的岩石在背弧 orintra 弧盆发展了。在 2150-1920 妈,造山带经历了几前紧张的事件,一条海洋的山脉的可能到期的 tosubduction,导致是的 mafic 女同性恋的炮兵阵地随后变形了到角闪岩和媒介 -- 到高压的 mafic granulites。在 1880-1820 妈,在东方、西方的块之间的海洋被俯冲完全消费,并且关门海洋导致了 continent-arc-continent 碰撞,它引起了大规模推进和等斜褶皱并且搬运了一些岩石进更低的外壳的层次或上地幔形成 granulites 或 eclogites 。山峰变态被 exhumation/uplift 跟随,导致在岩石中的不对称褶皱和 symplectic 质地的普遍开发。Guochun ZHAO LIU Shuwen Min SUN LI Sanzhong Simon WILDE Xiaoping XIA Jian ZHANG Yanhong HE 2006Acta Geologica Sinica(English Edition)2006,80,6:16
2U-Pb Zircon Dating of the Granitic Conglomerates of the Hutuo Group:Affinities to the Wutai Granitoids and Significance to the Tectonic Evolution of the Trans-North China Orogen显示文摘与在中间的最好、古典的剖面图 Trans 北方 ChinaOrogen 分割的邻近的 Fuping 和 Hengshan Complexesrepresents 联系的 Wutai 建筑群,通常划分了成东方、西方的块。Unconformably overlying Wutai andFuping 建筑群 Hutuo 组在这个区域被看作最年轻的岩石地层单位并且为解释前寒武纪的历史以及 theTrans 北方中国造山带的全面进化重要。在这个组的沉积岩的起源的知识的缺乏妨碍了 depositional 和构造意义的理解。LA-ICP-MS 被使用为花岗石的卵石获得 U-Pb 锆石年龄, Hutuo 组的最低岩石层位学的岩石,它,与结合了以前的岩石层位学, geochronological,结构、变形的数据,在沉积起源和这个区域的构造进化上提供新限制。Hutuo 的顺序从更低的底砾岩 andvolcaniclastic 岩石(Doucun 亚群) 向上组织范围,通过碎屑沉积物,板岩,白云石和云石(Dongye 亚群) ,到在顶(Guojiazhai 亚群) 的沙岩和集团企业。从在 Doucun 亚群底砾岩保存的花岗石的卵石的锆石给加权的mean~( 207 )在 2517 妈和 2566 妈之间的Pb/~( 206 ) Pb 年龄,它与为迟了的 ArcheanWutai Granitoids 的那些一样,显示卵石从 Wutai 花岗石的侵入( 2566-2515 妈)被导出。基于新数据和以前的研究,与在 Hutuo 组为 volcanics 获得的 2087 ±9 妈的火的锆石结晶化年龄结合了, Hutuo 组在在东方块的西方的边缘下面在西方的块的东方指导俯冲期间在 theWutai 弧后面发展了的subduction相关的制动火箭弧低岬盆环境被扔。这盆经历了长寿沉积并且最后在~ 1 期间关上了导致了北方中国古地台的最后的合并的 850 妈 collisional 事件。Jian ZHANG Guochun ZHAO LI Sanzhong Min SUN LIU Shuwen Xiaoping XIA Yanhong HE 2006Acta Geologica Sinica(English Edition)2006,80,6:15
3Diversity characterization and association analysis of agronomic traits in a Chinese peanut (Arachis hypogaea L.) mini-core collection显示文摘Association mapping is a powerful approach for exploring the molecular basis of phenotypic variations in plants.A peanut(Arachis hypogaea L.)mini-core collection in China comprising 298 accessions was genotyped using 109 simple sequence repeat(SSR)markers,which identified 554 SSR alleles and phenotyped for 15 agronomic traits in three different environments,exhibiting abundant genetic and phenotypic diversity within the panel.A model-based structure analysis assigned all accessions to three groups.Most of the accessions had the relative kinship of less than 0.05,indicating that there were no or weak relationships between accessions of the mini-core collection.For 15 agronomic traits in the peanut panel,generally the Q t K model exhibited the best performance to eliminate the false associated positives compared to the Q model and the general linear model-simple model.In total,89SSR alleles were identified to be associated with 15 agronomic traits of three environments by the Q t K model-based association analysis.Of these,eight alleles were repeatedly detected in two or three environments,and 15 alleles were commonly detected to be associated with multiple agronomic traits.Simple sequence repeat allelic effects confirmed significant differences between different genotypes of these repeatedly detected markers.Our results demonstrate the great potential of integrating the association analysis and marker-assisted breeding by utilizing the peanut mini-core collection.Huifang Jiang Li Huang Xiaoping Ren Yuning Chen Xiaojing Zhou Youlin Xia Jiaquan Huang Yong Lei Liying Yan Liyun Wan Boshou Liao 2014Journal of Integrative Plant Biology2014,56,2:14
4U-Pb Age and Hf Isotope Study of Detrital Zircons from the Wanzi Supracrustals:Constraints on the Tectonic Setting and Evolution of the Fuping Complex,Trans-North China Orogen显示文摘在 Trans 北方中国造山带的中间的片断定位了, FupingComplex 在理解北方 ChinaCraton (NCC ) 的进化历史被看作一个批评区域。建筑群由各种各样的高级、多样地使变形的岩石组成,包括灰色的片麻岩,基本 granulite,角闪岩,有细密纹理的片麻岩和大理石,变形了到上面的角闪岩或 granulite 外形。它能被划分成四个岩石单位:Fuping TTG 片麻岩, Longquanguan augen, Wanzi 在上 crustals,和 Nanying 花岗石的片麻岩。从 FupingComplex 的 Wanzi 在上 crustals 的大约 200 由岩屑形成的锆石的 U-Pb 年龄和 Hfisotope 作文被分析了。边界给的变形锆石上的数据 1.82-1.84 Ga 变老,相应于 NCC 的最后的合并事件为在~ 2 .10 和~ 2 .51 Ga 的火的锆石核心产量二年龄人口的数据,与在第 2.5a 2.9 Ga 之间散布的一些继承年龄。这些结果建议 Wanzi 在上 crustals 从 Fuping TTGgneisses (~ 2 .5 Ga ) 和 Nanying 花岗石的片麻岩(2.0-2.1 Ga ) 被导出并且在 2.10 and1.84 Ga 之间扔了。有~ 2 .51 Ga 年龄的所有锆石有起始的ε _(Hf ) 从 +1.4 珍视到 +10.9 的 positive,建议在通过从披风的少年材料的增加的~ 2 .5 Ga 的一个重要外壳的生长事件。为由岩屑形成的锆石的 Hf 同位素数据进一步暗示 2.8 Ga 岩石是在下地壳的重要部件,它与从为东方块的 Nd 同位素数据的一个建议一致。 2.10 Ga 人口的锆石有起始的ε_( Hf ) -4.9 to+6.1 的价值,作为在 2.1 Ga.These 结果与次要的少年材料贡献外壳的再融化混合解释了为西方的块从那是不同的,支持 Fuping 建筑群是在在东方块的西方的边缘的构造活跃环境的 emplaced 。Xiaoping XIA Min SUN Guochun ZHAO WU Fuyuan XU Ping Jian ZHANG Yanhong HE ZHANG Jiheng 2006Acta Geologica Sinica(English Edition)2006,80,6:12
5Relationship between nutrients and plankton biomass in the turbidity maximum zone of the Pearl River Estuary显示文摘Nutrients,dissolved and particulate organic carbon and plankton(bacterio-,phyto-and zoo-)were compared in the turbidity maximum zone(TMZ) and adjacent areas(non-TMZ) in the Pearl River estuary.Our results showed that high levels of suspended substances had marked effect on dynamics of nutrients and plankton in the TMZ.Based on the cluster analysis of total suspended solids(TSS) concentrations,all stations were divided into two groups,TMZ with average TSS of 171 mg/L and non-TMZ of 45 mg/L.Suspended substances adsorbed PO^(3-)_4 and dissolved organic carbon,resulting in higher particulate phosphorus and organic carbon(POC)and lower PO^(3-)_4 and DOC in the TMZ,compared to the non-TMZ.However,suspended substances had limited effect on nitrogenous nutrients.Phytoplankton growth was light-limited due to high concentrations of suspended substances in the TMZ and a peak of phytoplankton abundance appeared in the non-TMZ.In contrast,the highest bacterial abundance occurred in the TMZ,which was likely partly responsible for low DOC levels.Two peaks of zooplankton abundance observed in the TMZ and non-TMZ in the Pearl River estuary were primarily supported by bacteria and phytoplankton,respectively.Our finding implied that high levels of suspended solids in the TMZ affect the trophic balance.Zhen Shi Jie Xu Xiaoping Huang Xia Zhang Zhijian Jiang Feng Ye Ximei Liang 2017Journal of Environmental Sciences2017,29,7:12
6Clinical and genetic findings in a Chinese family with VDR-associated hereditary vitamin D-resistant rickets显示文摘Hereditary vitamin D-resistant rickets(HVDRR) is a rare autosomal recessive disorder characterized by severe rickets,hypocalcemia,hypophosphatemia,secondary hyperparathyroidism,and elevated alkaline phosphatase.This disorder is caused by homogeneous or heterogeneous mutations affecting the function of the vitamin D receptor(VDR),which lead to complete or partial target organ resistance to the action of 1,25-dihydroxy vitamin D.A non-consanguineous family of Chinese Han origin with one affected individual demonstrating HVDRR was recruited,with the proband evaluated clinically,biochemically and radiographically.To identify the presence of mutations in the VDR gene,all the exons and exon–intron junctions of the VDR gene from all family members were amplified using PCR and sequenced.The proband showed rickets,progressive alopecia,hypocalcemia,hypophosphatemia,secondary hyperparathyroidism,and elevated alkaline phosphatase.She also suffered from epilepsy,which is rarely seen in patients with HVDRR.Direct sequencing analysis revealed a homozygous missense mutation c.122G4A(p.C41Y) in the VDR gene of the proband,which is located in the first zinc finger of the DNA-binding domain.Both parents had a normal phenotype and were found to be heterozygous for this mutation.We report a Chinese Han family with one individual affected with HVDRR.A homozygous missense mutation c.122G4A(p.C41Y) in the VDR gene was found to be responsible for the patient's syndrome.In contrast to the results of treatment of HVDRR in other patients,our patient responded well to a supplement of oral calcium and a low dose of calcitriol.Qianqian Pang Xuan Qi Yan Jiang Ou Wang Mei Li Xiaoping Xing Jin Dong Weibo Xia 2016Bone Research2016,4,1:9
7Genetic algorithms for determining the parameters of cellular automata in urban simulation显示文摘This paper demonstrates that cellular automata(CA) can be a useful tool for analyzing the process of many geographical phenomena.There are many studies on using CA to simulate the evolution of cites.Urban dynamics is determined by many spatial variables.The contribution of each spatial variable to the simulation is quantified by its parameter or weight.Calibration procedures are usually required for obtaining a suitable set of parameters so that the realistic urban forms can be simulated.Each pa-rameter has a unique role in controlling urban morphology in the simulation.In this paper,these pa-rameters for urban simulation are determined by using empirical data.Genetic algorithms are used to search for the optimal combination of these parameters.There are spatial variations for urban dynam-ics in a large region.Distinct sets of parameters can be used to represent the unique features of urban dynamics for various subregions.A further experiment is to evaluate each set of parameters based on the theories of compact cities.It is considered that the better set of parameters can be identified ac-cording to the utility function in terms of compact development.This set of parameters can be cloned to other regions to improve overall urban morphology.The original parameters can be also modified to produce more compact urban forms for planning purposes.This approach can provide a useful ex-ploratory tool for testing various planning scenarios for urban development.LI Xia YANG QingSheng LIU XiaoPing 2007Science China Earth Sciences2007,50,12:8
8Geochronological and geochemical constraints on the Cuonadong leucogranite, eastern Himalaya显示文摘First comprehensive investigations of the Cuonadong leucogranite exposed in North Himalayan gneiss dome of southern Tibet are presented in this study.The SIMS U–Pb ages of oscillatory zircon rims scatter in a wide range from 34.1 to 16.0 Ma, and the Cuonadong leucogranite probably emplaced at 16.0 Ma. High-precision ^(40)Ar/^(39)Ar dating on a muscovite sample yields an essentially flat age spectrum with consistent plateau and isochron ages, indicating that the Cuonadong leucogranite cooled below 450 °C at 14 Ma. Based on the youngest zircon U–Pb age and muscovite^(40)Ar/^(39)Ar age, the Cuonadong leucogranite experienced rapid cooling with a rate of 119 °C/Myr from 16 to 14 Ma. The geochronological data of this undeformed leucogranite also suggest that the ductile extension of the South Tibetan Detachment System in the eastern Himalaya ceased by ca. 14 Ma. Furthermore,the initial Sr–Nd isotopic compositions and Nd model ages demonstrate that the leucogranite was derived from metapelitic source within the Greater Himalayan Crystalline Complex. The distinct Ba depletion with high Rb/Sr ratios and negative Eu anomalies make it clear that the leucogranite melts were generated by breakdown of muscovite under fluid-absent conditions.Jiajia Xie Huaning Qiu Xiujuan Bai Wanfeng Zhang Qiang Wang Xiaoping Xia 2018Acta Geochimica2018,37,3:7
9Picoplankton and virioplankton abundance and community structure in Pearl River Estuary and Daya Bay, South China显示文摘By using flow cytometry techniques, we investigated the abundance and composition of the heterotrophic prokaryotes, virioplankton and picophytoplankton community in the Pearl River Estuary and Daya Bay in the summer of 2012. We identified two subgroups of prokaryotes, high nucleic acid(HNA) and low nucleic acid(LNA), characterized by different nucleic acid contents. HNA abundance was significantly correlated with larger phytoplankton and Synechococcus(Syn) abundance, which suggested the important role of organic substrates released from primary producers on bacterial growth. Although LNA did not show any association with environmental variables, it was a vital component of the microbial community. In contrast to previous studies, the total virioplankton concentration had a poor relationship with nutrient availability. The positive relationship between large-sized phytoplankton abundance and the V–I population confirmed that V–I was a phytoplankton-infecting viral subgroup. Although the V–II group(bacteriophages)was dominant in the virioplankton community, it was not related with prokaryotic abundance, which indicated factors other than hosts controlling V–II abundance or the uncertainty of virus-host coupling. With respect to the picophytoplankton community,our results implied that river input exerted a strong limitation to Syn distribution in the estuary, while picoeukaryotes(Euk) were numerically less abundant and showed a quite different distribution pattern from that of Syn, and hence presented ecological properties distinct from Syn in our two studied areas.Zhixin Ni Xiaoping Huang Xia Zhang 2015Journal of Environmental Sciences2015,27,6:7
10Superelastic wire-shaped supercapacitor sustaining 850% tensile strain based on carbon nanotube@graphene fiber显示文摘Huimin Wang Chunya Wang Muqiang Jian Qi Wang Kailun Xia Zhe Yin Mingchao Zhang Xiaoping Liang Yingying Zhang 2018Nano Research2018,11,5:6
11Physical sensors for skin-inspired electronics显示文摘Skin,the largest organ in the human body,is sensitive to external stimuli.In recent years,an increasing number of skin-inspired electronics,including wearable electronics,implantable electronics,and electronic skin,have been developed because of their broad applications in healthcare and robotics.Physical sensors are one of the key building blocks of skin-inspired electronics.Typical physical sensors include mechanical sensors,temperature sensors,humidity sensors,electrophysiological sensors,and so on.In this review,we systematically review the latest advances of skin-inspired mechanical sensors,temperature sensors,and humidity sensors.The working mechanisms,key materials,device structures,and performance of various physical sensors are summarized and discussed in detail.Their applications in health monitoring,human disease diagnosis and treatment,and intelligent robots are reviewed.In addition,several novel properties of skin-inspired physical sensors such as versatility,self-healability,and implantability are introduced.Finally,the existing challenges and future perspectives of physical sensors for practical applications are discussed and proposed.Shuo Li Yong Zhang Yiliang Wang Kailun Xia Zhe Yin Huimin Wang Mingchao Zhang Xiaoping Liang Haojie Lu Mengjia Zhu Haomin Wang Xinyi Shen Yingying Zhang 2020InfoMat2020,2,1:5
12The efficacy and safety of nimodipine in acute ischemic stroke patients with mild cognitive impairment: a double-blind, randomized,placebo-controlled trial显示文摘Nimodipine might be effective in subcortical vascular dementia(VaD). Its benefit in preventing further cognitive decline in patients with acute ischemic stroke(AIS) and vascular mild cognitive impairment(VaMCI) remains to be established. In this multicenter, double-blind trial, we randomly assigned 654 eligible patients to nimodipine 30 mg three times a day or placebo. The primary outcome was any cognitive decline defined by the changes on the Mini-Mental State Examination(DMMSE à3) or vascular AD assessment scale cognitive subscale(DADAS-cog ! 4) at 6 months. Secondary outcomes included any distribution shift of DADAS-cog, DMMSE or cognitive improvement defined by DADAS-cog à2, or DMMSE ! 0. The primary outcome in the nimodipine group and placebo group were similar for DMMSE à3(4.18% and 7.22%, respectively, P = 0.15) and DADAS-cog ! 4(8.36% and 8.93% respectively,P = 0.88). The distribution shift of DADAS-cog and DMMSE differed significantly between the two groups(P = 0.03 and P = 0.05 respectively). Cognitive improvement occurred in 55.4% in the nimodipine group and 43.6% in the placebo group measured by DADAS-cog à2(Odds Ratio, 1.54; 95% confidence interval[CI] 1.10–2.14, P < 0.01) or 84.0% and 74.6% respectively by DMMSE ! 0(Odds Ratio, 1.79; 95% CI 1.18–2.70, P < 0.01). Nimodipine was associated with better cognitive function in the memory domain. The adverse events rate was similar in two groups. This study is registered with ClinicalTrials.gov,NCT01220622. Nimodipine did not show benefit to prevent cognitive decline in AIS patients with VaMCI, but improved cognition moderately, especially measured in the memory domain.Huaguang Zheng Yilong Wang Anxin Wang Hao Li David Wang Xingquan Zhao Penglian Wang Haipeng Shen Lijun Zuo Yuesong Pan Zixiao Li Xia Meng Xianwei Wang Weixiong Shi Yi Ju Liping Liu Kehui Dong Chunxue Wang Rubo Sui Rong Xue Xiaoping Pan Xiaoyua Niu Benyan Luo Yi Sui Huali Wang Tao Feng Yongjun Wang 2019Science Bulletin2019,64,2:5
13Integration of small world networks with multi-agent systems for simulating epidemic spatiotemporal transmission显示文摘This study proposes an integrated model based on small world network (SWN) and multi-agent system (MAS) for simulating epidemic spatiotemporal transmission. In this model, MAS represents the process of spatiotemporal interactions among individuals, and SWN describes the social relation network among agents. The model is composed of agent attribute definitions, agent movement rules, neighborhoods, construction of social relation network among agents and state transition rules. The construction of social relation network and agent state transition rules is essential for implementing the proposed model. The decay effects of infection 'memory', distance and social relation between agents are introduced into the model, which are unavailable in traditional models. The proposed model is used to simulate the transmission process of flu in Guangzhou City based on the swarm software platform. The integration model has better performance than the traditional SEIR model and the pure MAS based epidemic model. This model has been applied to the simulation of the transmission of epidemics in real geographical environment. The simulation can provide useful information for the understanding, prediction and control of the transmission of epidemics.LIU Tao LI Xia LIU XiaoPing 2010Chinese Science Bulletin2010,55,13:5
14Phytoplankton Assemblage Structure Shaped by Key Environmental Variables in the Pearl River Estuary, South China显示文摘Spatial distribution and temporal dynamics of phytoplankton community and their relationships with environmental factors were studied in the Pearl River Estuary(PRE), South China, in three seasons. Salinity was considered as the key environmental variable controlling horizontal distributions of phytoplankton community composition. A transition from dominance of freshwater diatoms(Aulacoseira granulata and A. granulata v. angustissima) to estuarine species(Skeletonema costatum and Pseudonitzschia delicatissima) was observed in the high flow season(summer) along the estuary gradient; in the low flow season(spring), the inner estuary was relatively homogeneous and some typical estuarine species could be found near the river mouth. In the normal flow season(autumn), a potentially toxic bluegreen species, Microcystis spp. was predominant in the middle reaches of the estuary, which should be seeded from upstream and transported downstream by river discharges. Phytoplankton abundance was negatively correlated with suspended solid content and nutrient concentration in the PRE, suggesting that turbidity and nutrient availability were the crucial factors regulating the algal biomass. Phytoplankton abundance in the outer estuary was enhanced by increasing irradiance and continued to be enhanced until phosphorus-limitation.ZHANG Xia ZHANG Jingping HUANG Xiaoping HUANG Liangmin 2014Journal of Ocean University of China2014,13,1:5
15Coupled trace element and SIMS sulfur isotope geochemistry of sedimentary pyrite:Implications on pyrite growth of Caixiashan Pb-Zn deposit显示文摘Colloform pyrite with core-rim texture is commonly deposited in carbonate platforms associated with the sulfide ores such as the Caixiashan Pb-Zn deposit.However,the genesis of colloform pyrite in Pb-Zn deposits,its growth controls and their geological implication are insufficiently understood.Integration of in-situ trace element and SIMS sulfur isotopes has revealed geochemical variations among these pyrite layers.These colloform pyrite occur as residual phases of core-rim aggregates,the cores are made up of very fine-grained anhedral pyrite particles,with some rims being made up of fine-grained and poorlycrystallized pyrite,while the other rims were featured with euhedral cubic pyrite.which are cemented by fine-grained calcite and/or dolomite with minor quartz.Sulfur isotope analysis shows that some wellpreserved rims have negative δ^34 S values(-28.12‰to-0.49‰),whereas most of the cores and rims have positive δ^34 S values(>0 to+44.28‰;peak at+14.91‰).Integrating with the methane and sulfate were observed in previous fluid inclusion study,we suggest that the 34 S depleted rims were initially formed by bacteria sulfate reduction(BSR),whereas the positive δ^34 S values were resulted from the sulfate reduction driven by anaerobic methane oxidation(AOM).The well-developed authigenic pyrite and calcite may also support the reaction of AOM.Combined with petrographic observations,trace element composition of the colloform pyrite reveals the incorporation and precipitation behavior of those high abundance elements in the pyrite:Pb and Zn were present as mineral inclusion and likely precipitated before Fe,as supported by the time-resolved Pb-Zn signal spikes in most of the analyzed pyrite grains.Other metals,such as Hg,Co and Ni,may have migrated as chloride complexes and entered the pyrite lattice.Arsenic and Sb,generally influenced by complex-forming reactions rather than substitution ones,could also enter the pyrite lattice,or slightly predate the precipitation of colloform pyrite as mineral inclusions,which are controlled by their hydrolysis constant in the ore fluids.The colloform pyrite may have grown inward from the rims.The successive BSR reaction process would enrich H^32/2S in the overlying water column but reduce the metal content,the nucleation of these pyrite rims was featured by strongly negative sulfur isotopes.The following AOM process should be activated by deformation like the turbidity sediment of the mudstone as the sulfide deposition are associated with fault activities that caused the emission of methane migration upward and simultaneously replenishing the metal in the column.The higher AOM reaction rate and the higher metal supply(not only Fe.but with minor other metals such as Pb and Zn) caused by sediment movement enhanced the metal concentration within the pyrite lattice.Dengfeng Li Huayong Chen Xiaoming Sun Yu Fu Qiaofen Liu Xiaoping Xia Qing Yang 2019Geoscience Frontiers2019,10,6:4
16Post-fledging dispersal and habitat use of a reintroduced population of the Crested Ibis (Nipponia nippon)显示文摘Background: Knowledge of dispersal movement of birds and their habitat preference during the post-fledging period is fundamental to the understanding of their ecological and evolutionary processes. The Crested Ibis is now being reintroduced to protected sites within its historical range, with the goal of establishing a self-sustaining population that may eventually qualify the species for delisting.Methods: We carried out an ecological study of post-fledging dispersal and habitat use of a reintroduced population of the Crested Ibis(Nipponia nippon) from 2008 to 2012 in Ningshan County, China, by using banding and radio-telemetry methods.Results: In about two weeks(an average of 14.3 days) after fledging, the activities of the fledglings were concentrated in a range of about 100 m around their natal sites, such as the oak-pine forest patches at the edge of open habitats.During this period, fledglings were still partially dependent upon parental care and fed typically on a daily basis.Siblings increasingly became independent by mid-August and then gradually moved away from their natal sites to post-fledging dispersal locations. During the period of the post-fledging dispersal process, most juveniles moving southwest were concentrated at the mean direction(μ = 254.6°, ? = 70.5°) with a mean dispersal distance of 5.1 km.It took an average of 56.4 days to disperse from the natal territory to the first wintering area. Also, forging habitats for juvenile ibis varied with time and local conditions. For example, paddy fields were used most frequently among all habitat types, while shallow rivers just from August to October. Masson pine(Pinus massoniana) was often regarded as the roosting tree species preferred by the Crested Ibis, with the highest utilization rate among all the roosting habitat types. The juveniles of the wild population dispersed four times as far as that of the reintroduced population, but the overall pattern of post-fledging dispersal is similar for the reintroduced and wild populations.Conclusions: Our results are very useful for us to predict the distance and direction of dispersal under various landscape conditions in other released sites. The project is a good example for reintroducing endangered species to their former ranges, and will be valuable for the protection of reintroduced populations of this critically and other endangered species.Zhiping Huo Junfeng Guo Xia Li Xiaoping Yu 2014Chinese Birds2014,,1:4
17Quality Control and Evaluation of the Observed Daily Data in the North American Soil Moisture Database显示文摘The North American Soil Moisture Database (NASMD) was initiated in 2011 to assemble and homogenize in situ soil moisture measurements from 32 observational networks in the United States and Canada encompassing more than 1800 stations. Although statistical quality control (QC) procedures have been applied in the NASMD, the soil moisture content tends to be systematically underestimated by in situ sensors in frozen soils, and using a single maximum threshold (i.e., 0.6 m3 m-3) may not be sufficient for robust QC because of the diverse soil textures in North America. In this study, based on the in situ soil porosity and North American Land Data Assimilation System phase 2 (NLDAS-2) Noah soil temperature, the simple automated QC method is revised to supplement the existing QC approach. This revised QC method is first validated based on the assessment at 78 of the Soil Climate Analysis Network (SCAN) stations where the manually checked data are available, and is then applied to all stations in the NASMD to produce a more strict quality-controlled dataset. The results show that the revised automated QC procedure can flag the spurious and erroneous soil moisture measurements for the SCAN stations, especially for those located in high altitudes and latitudes. Relative to station measurements in the original NASMD, the quality-controlled data show a slightly better agreement with the manually checked soil moisture content. It should be noted that this quality-controlled dataset may be over-flagged for some valid soil moisture measurements due to potential errors of the soil temperature and soil porosity data, and validation in this study is limited by the availability of benchmark soil moisture data. The updated QC and additional validation will be desirable to boost confidence in the product when high-quality data become available in the future.Weilin LIAO Dagang WANG Guiling WANG Youlong XIA Xiaoping LIU 2019Journal of Meteorological Research2019,33,3:4
18GPU-CA model for large-scale land-use change simulation显示文摘Land-use change simulation for large-scale regions(i.e.provincial regions or countries) is very useful for many global studies.Such simulation,however,is affected by computational capability of general computers.This paper proposes a method to implement cellular automata(CA) for land use change simulation based on graphics processing units(GPUs).This method can be applied to large-scale land-use change simulations by combining the latest GPU high-performance computing technology and CA.We carried out the experiments by simulating land-use change processes at a provincial scale.This involves a lot of sophisticated techniques,such as model mapping,and computational procedure of GPU-CA model.This proposed model has been validated by land-use change simulation in Guangdong Province,China.The comparison indicates that the GPU-CA model is faster than traditional CA by 30 times.Such improvement is crucial for land-use change simulations in provincial regions and countries.The outputs of the simulation can be further used to provide information to other global change models.LI Dan LI Xia LIU XiaoPing CHEN YiMin LI ShaoYing LIU Kai QIAO JiGang ZHENG YiZhong ZHANG YiHan LAO ChunHua 2012Chinese Science Bulletin2012,57,19:4
19Upconversion nanoparticles@AgBiS_(2) core-shell nanoparticles with cancer-cell-specific cytotoxicity for combined photothermal and photodynamic therapy of cancers显示文摘UCNPs@AgBiS_(2) core-shell nanoparticles that AgBiS_(2) coated on the surface of upconversion nanoparticles (UCNPs) was successfully prepared through an ion exchange reaction. The photothermal conversion efficiency of AgBiS_(2) can be improved from 14.7% to 45% due to the cross relaxation between Nd ions and AgBiS_(2). The doping concentration of Nd ions played a critical role in the production of reactive oxygen species (ROS) and enhanced the photothermal conversion efficiency. The NaYF4:Yb/Er/Nd@NaYF4:Nd nanoparticles endows strong upcon-version emissions when the doped concentration of Nd ions is 1% in the inner core, which excites the AgBiS_(2) shell to produce ROS for photodynamic therapy (PDT) of cancer cells. As a result, the as-prepared NaYF4:Yb/Er/ Nd@NaYF4:Nd@AgBiS_(2) core-shell nanoparticles showed combined photothermal/photodynamic therapy (PTT/ PDT) against malignant tumors. This work provides an alternative near-infrared light-active multimodal nano-structures for applications such as fighting against cancers.Zhaoyou Chu Tian Tian Zhenchao Tao Juan Yang Benjin Chen Hao Chen Wanni Wang Peiqun Yin Xiaoping Xia Hua Wang Haisheng Qian 2022Bioactive Materials2022,7,11:3
20Effect of puerarin on myocardial perfusion and ventricular wall motion in patients with acute coronary syndrome显示文摘Objective To investigate the effects of puerarin (Pur) on myocardial perfusion and ventricular wall motion in patients with acute coronary syndrome (ACS).Methods Thirty-seven patients with ACS were randomly divided into two groups:conventional treatment group (n= 17,11 males,range of age:32-80 years,average age:60.9±4.9 years) and Pur treatment group (n=20,12 males,range of age:40-76 years,average age:62.7±3.5 years).Patients in the conventional treatment group received standard treatment according to the current guidelines,while patients in the Pur treatment group received intravenous administration of Pur (500 mg/day) for 10 days plus conventional treatment.Real-time myocardial contrast echocardiography (RT-MCE) was performed to evaluate the change in myocardial perfusion index (MPI) and ventricular wall motion index (VWMI) at admission and 10 days after treatment.Results At 10 days after treatment,MPI was significantly higher (P<0.01) and VWMI significantly lower (P<0.01) in the Pur group comparing with those in the conventional group.Conclusions Puerarin might improve myocardial microcirculation perfusion and ventricular wall motion in patients with ACS.Ling Niu Dongye Li Yong Xia Defeng Pan Xiaoping Wang Yan Yan Li Liang Tongda Xu Cardiovascular Institute of Xuzhou Medical College, Department of Cardiology, Affiliated Hospital, Xuzhou Medical College, Xuzhou, Jiangsu 221002, China 2008Journal of Geriatric Cardiology2008,5,3:3
返回顶部 每页显示:
共7页 首页 上一页 第1页 下一页 末页 /7 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