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1343篇 您的检索式:作者名="Dodson"
    题名 作者 年代 出处 被引量
1黄土炭屑分级统计方法及其在火演化研究中的意义显示文摘在综合了炭屑筛选法和炭屑花粉流程分析法的基础上,设计了一套从黄土、古土壤和古文化层中提取不同粒径炭屑的新途径——黄土炭屑分级统计方法,对不同粒级的炭屑进行分析和统计.筛选法提取、统计粒径在125μm 以上的炭屑颗粒,作为地方性火活动的替代指标;而用炭屑花粉流程分析方法获取粒径在125μm 以下的炭屑颗粒,作为区域性火活动的替代指标.黄土炭屑分级统计方法提高了炭屑研究的精度,丰富了黄土火演化研究的内容,是建立黄土高原火演化历史,研究植被演替和生态特征的重要途径,在认识黄土高原气候变化,探讨人类活动及其环境效应等方面具有重要意义.李小强 周新郢 尚雪 John Dodson 2006湖泊科学2006,18,5:57
2甘肃西山坪遗址生物指标记录的中国最早的农业多样化显示文摘通过花粉、农作物种子和植硅石等农业活动生物指标记录研究,结合高精度AMS^14C测年,重建了甘肃西山坪遗址5250-4300calaBP时段的农作物类型和农业栽培特征.5100calaBP以来农业活动增强,5070calaBP出现中国西北最老的稻作农业遗存.4600calaBP左右针叶林突然消失和栗树扩张是先民选择性砍伐针叶树,保留并栽培栗树的结果.西山坪遗址4650-4300calaBP期间种植有粟、黍、水稻、小麦、燕麦、青稞、大豆和荞麦等8种粮食作物,囊括了东、西亚2个农业起源中心的主要作物类型.不仅证实小麦和燕麦早在4650calaBP已传播到中国西北地区,也揭示了中国最早的农业多样化可能出现在新石器时代的甘肃天水地区.李小强 周新郢 周杰 John Dodson 张宏宾 尚雪 2007中国科学(D辑)2007,37,7:41
3新疆新塔拉遗址农业活动特征及其影响的植物指标记录显示文摘本文选择新疆中部新塔拉剖面为研究对象,运用炭化种子和花粉等植物指标,对新塔拉先民农业活动及其环境效应进行了探讨。新塔拉小麦炭化种子直接测年为3682~3921 cal.aB.P.,指示新塔拉地区早在3800cal.aB.P.左右已有小麦农业,与古墓沟小麦遗存相当,早于小河墓地小麦遗存。研究显示新塔拉在3600~3900cal.aB.P.之间农业活动以小麦种植为主,黍作为辅。新疆地区干旱气候条件下,农业活动尤其是灌溉农业可导致土地盐碱化加剧。土地盐碱化可能是新塔拉地区3600cal.aB.P.以后农业活动减弱的主要原因。赵克良 李小强 周新郢 John Dodson 纪明 2012第四纪研究2012,32,2:27
4考古生物指标记录的中国西北地区5000aBP水稻遗存显示文摘西山坪遗址花粉、种子、植硅体等考古生物指标记录和加速器^14C测年,显示甘肃天水5070cal a BP已开始种植水稻并在5070~4300cal a BP时段持续存在,是目前已知中国西北最老、最西北端的稻作遗存.这一发现将史前稻作农业记录向西拓展了至少2个经度,有助于准确判定5000a BP这一重要时点东亚稻作农业的分布区域,探讨新石器时代稻作农业传播的时间、路径和方式。李小强 周新郢 张宏宾 周杰 尚雪 John Dodson 2007科学通报2007,52,6:26
5陇东地区新石器时代的早期农业及环境效应显示文摘通过陇东地区新石器时代2处文化层剖面及5处文化点的花粉、炭屑、种子的综合研究,重建了陇东地区新石器时代农业发展过程及其环境效应.研究显示,陇东地区早期农业经历了由单一黍作农业向黍、粟混作,并结合水稻、大豆等多样化农业发展过程.旱作农作物黍在仰韶文化早,中期占有绝对的优势,而粟在仰韶文化晚期开始明显增加,在齐家文化时期达到最大值.陇东地区仰韶文化晚期大豆开始栽培,稻作农业在陇东地区出现不晚于4800cal a BP,并延续到约4000cal a BP的齐家文化.新石器时代陇东黄土高原塬面以灌丛草原植被为主,沟谷地带存在云杉-铁杉-栎为主的针阔叶混交林,新石器时代农业活动减少自然植被盖度,促使灌丛草原趋向于单一的蒿属草原.农业活动减弱或消退后,以沙棘、蔷薇科、麻黄、豆科、蒿属、藜科为主的灌丛草原植被得以恢复.周新郢 李小强 赵克良 DODSON John 孙楠 杨青 2011科学通报2011,56,4:24
6The earliest archaeobiological evidence of the broad-ening agriculture in China recorded at Xishanping site in Gansu Province显示文摘The crop types and agricultural characteristic are reconstructed using the archaeobiological proxies of pollen, seed and phytolith at Xishanping site in Gansu Province between 5250 and 4300 cal a BP. The agricultural activity strengthened in Xishanping from 5100 cal a BP. It appeared the earliest cultivation of prehistoric rice in the most northwest China at 5070 cal a BP. The sudden disappearance of conifers and expansion of chestnut trees is likely to be the result of selective hewing of conifers and cultivation of chestnuts at about 4600 cal a BP. There existed 8 crop types of foxtail millet, broomcorn millet, rice, wheat, barley, oats, soybean and buckwheat at Xishanping between 4650 and 4300 cal a BP, which cover the main crop types of the two origin centers of East and West Asia. Not only has the wheat and barley been approved to spread to northwestern China, but the earliest complexity agriculture in Neo-lithic China appeared in Tianshui, Gansu Province.J. DODSON 2007Science China Earth Sciences2007,50,11:19
7On a New Genus of Basal Neoceratopsian Dinosaur from the Early Cretaceous of Gansu Province, China显示文摘A new genus and species of basal neoceratopsian dinosaur, Auroraceratops rugosus, is reported based on material from the Early Cretaceous Xinminpu Group in the Gongpoquan Basin of Gansu Province, China. Auroraceratops is represented by a nearly complete skull and low jaws, and different greatly from all other neoceratopsians by its considerable breadth of the nasals, fungiform expansion of the dorsal end of the lacrimal, highly developed rugosity of the jugal, dentary and surangular, and inflated, striated premaxillary teeth. The finding of Auroraceratops adds diversity and helps elucidate the evolution of basal neoceratopsian dinosaurs.YOU Hailu LI Daqing JI Qiang Matthew C. LAMANNA Peter DODSON 2005Acta Geologica Sinica(English Edition)2005,79,5:13
8肝移植后胆道并发症的诊断和处理显示文摘目的 研究肝移植后胆道并发症的诊断和处理及分析相关因素。方法 回顾性研究Pittsburgh移植中心 96例肝移植病人。 结果 94例 (97次移植 )存活 2d以上的病人 ,92例为端端+T管的胆道吻合。随访时间为 5 8个月 (0 3~ 10 2个月 )。分析发现 92例病人中 8例有胆道并发症 (8 5 1% ) :T管拔除时胆漏 2例 ,术后早期胆漏 2例 ,胆漏和狭窄 2例 ,狭窄 2例。 75 %胆道并发症有诱因 ,诱因 :肝动脉狭窄 2例 ,其中 1例合并严重排斥反应 ;肝动脉血栓 3例 ;供 -受体胆管直径不匹配 1例。冷缺血时间无显著性差异。 5例有肝动脉血栓和 (或 )狭窄 >5 0 %行再移植 ,另 3例无肝动脉血栓和 (或 )狭窄 <5 0 %经皮穿刺和内窥镜 +支架或行气囊扩张。所有病人均获得良好疗效。结论 肝移植术后胆道并发症发生率为 8 5 1% (胆 胆端端吻合 +T管 ) ,胆道狭窄晚于胆漏 ,肝动脉栓塞和 (或 )狭窄是最重要的相关因素 ;无肝动脉栓塞和 (或 )狭窄 ,则无需手术治疗 ,若有肝动脉栓塞和(或 )狭窄 >5 0 % 。周光文 蔡伟耀 李宏为 朱岳 Forrest Dodson JohnJ Fung 2002中华肝胆外科杂志2002,8,5:11
9The record of cultivated rice from archaeobiological evidence in northwestern China 5000 years ago显示文摘Pollen, plant seeds and phytoliths from an AMS dated sediment profile at the Xishanping site indicate that the cultivation of rice might start no later than 5070 cal. a BP in the region of Tianshui, Gansu Province. It continued from 5070 to 4300 cal. a BP. This is so far the oldest and the most northwestern record of cultivated rice in Neolithic China, which extends the known region of prehistoric rice cultivation at least 2° longitude to the west. This finding provides important evidence for reconstructing the cultivation region of rice at 5000 a BP (an important time period), and its spreading history in East Asia, during the Neolithic.LI XiaoQiang ZHOU XinYing ZHANG HongBin ZHOU Jie SHANG Xue DODSON John 2007Chinese Science Bulletin2007,52,10:11
10Early agricultural development and environmental effects in the Neolithic Longdong basin(eastern Gansu)显示文摘Neolithic agricultural development and environmental effects in the Longdong area were reconstructed using a synthetic approach,investigating pollen,charcoal,and seed remains for two cultural layer sections and five flotation sites.Results show that Neolithic agriculture in the Longdong area had a simple organization and was dominated by the production of common millet,especially in the early and middle Yangshao age.After the late Yangshao age,Neolithic agriculture developed into a more complex structure,dominated by both common and foxtail millet and the cultivation of rice and soybeans.The production of foxtail millet gradually increased through the Neolithic period,reaching its highest point during the Qijia culture.Soybeans were first cultivated during the late Yangshao culture,approximately 5000 cal a BP.Rice production began no later than 4800 cal a BP,and continued to exist in the Qijia culture,approximately 4000 cal a BP.Agricultural production in Neolithic Longdong,specifically in the 'Yuan' area of the loess plateau,developed as a shrub and grass dominated landscape.Vegetation in the river valleys was partly covered with Picea,Tusga,and Quercus coniferous and broadleaf mixed forests.Agricultural activity during the Neolithic period caused an increase in farmland on the loess tableland and a decrease in the abundance of shrub and grassland in the Longdong area.When farmlands were abandoned,vegetation recovered with Hippophae-,Rosaceae-,Ephedra-,and Leguminosae-dominated shrublands and Artemisia-dominated grasslands.ZHOU XinYing LI XiaoQiang ZHAO KeLiang DODSON John SUN Nan YANG Qing 2011Chinese Science Bulletin2011,56,8:10
11黄土高原南部下河遗址全新世中期的植被与气候:基于木炭化石记录显示文摘基于黄土高原南部白水县西固乡下河西村下河遗址木炭化石记录的系统分析并结合高精度AMS^(14)C测年,重建了研究区5050~4870cal.aB.P.时段植被特征和古气候要素值。研究结果显示全新世中期沟谷地带发育以栎、青冈为主的阔叶林地,其中包括柿树、枣树等经济型林木。通过所鉴定的10个乔木植物种属的共存因子法分析,获得白水下河地区(35.14°N,109.69°E)5050~4870cal.aB.P.时段的气候要素值。年均温(MAT)为12.9℃,比现在高约1.5℃;年均降水量(MAP)为758.4mm,比现在高约180mm;与现今秦岭南麓东部的陕西镇安地区(33.45°N,109.16°E)的气候环境相当,可能指示了气候带向北纬推移了约1.7°。孙楠 李小强 尚雪 周新郢 Dodson John 2014第四纪研究2014,34,1:10
12Vegetation and Environment History for the Past 14 000 yr BP from Dingnan, Jiangxi Province, South China显示文摘迟了的 Pleistocene-Holocene 花粉,磷,和炭记录在南部的中国在南部的江西省从 peatland 被重建。今天的区域与米饭稻,蔬菜,和水果统治的村庄,小镇,和农业有一处多山、滚动的风景第二等的森林和松重新植林的花园,以及区域。记录在 14 300 年 BP 前开,与统治沼泽地区域的 Alnus 树林并且与包围斜坡上的开的 Quercus 树林。森林区域从约 12 800 年 BP 变得更复杂并且从 9 000 年 BP 进一步。在约 6 000 年 BP,有变清的证据,由 45004000 年 BP,在沼泽地 Alnus 和陆上的森林的完全的倒塌作为低区域被变换成米饭生产。为许多记录,在这个地点附近的火的出现是低的,尽管有地区性的火的证据。火在变清被用作一个工具然后在残株在米饭收获以后烧的年度周期使用了。营养素铺平,在沉积由全部的磷思考了似乎是仔细,与在表面的森林变化和高价值有关,层可能源于与农业联系的陆地管理技术。因此,人的影响极大地改变了森林盖子,火频率,和滋养的动力学;这为约 6 000 年 BP 是明显的然后加强向现代。John Richard Dodson Shirene Hickson Rachel Khoo Xiao-Qiang Li Jemina Toia Wei-Jian Zhou 2006Journal of Integrative Plant Biology2006,48,9:7
13经颈静脉肝内门体分流术(TIPSS)与肝移植显示文摘目的 经颈静脉肝内门体分流术 (TIPSS)正逐渐成为控制食管曲张静脉破裂出血和肝移植之间的桥梁。目前国内没有有关TIPSS对原位肝移植手术影响的报道。方法 回顾性研究接受术前TIPSS治疗的肝移植病人 ,即评价TIPSS作为肝移植桥梁的有效性和是否影响移植手术。结果 匹兹堡移植中心 5例术前接受TIPSS的肝移植病人。行TIPSS与肝移植间隔时间为 9 6 (0 2~2 4 7)个月 ,3例病人在肝移植前能有效地控制出血。 4例病人的支架位于肝实质内 ,并不影响手术 ;1例部分突出于肝外门静脉 ,术中需要移去支架。术后随访时间平均 4 2 (2~ 7)个月 ,无门静脉血栓形成。手术时间和术中输血量无显著性差异。结论 TIPSS是一种有效的桥梁 ,并没有增加移植术后并发症发生率和死亡率 ;鉴于有潜在的手术风险 ,支架最好放置在肝实质内 ,但肝外支架并不构成移植手术的反指征。周光文 蔡伟耀 李宏为 朱岳 Forrest Dodson John J Fung 2002中华肝胆外科杂志2002,8,11:3
14Integer ambiguity resolution in precise point positioning: method comparison显示文摘Jianghui Geng Xiaolin Meng Alan H. Dodson Felix N. Teferle 2010Journal of Geodesy2010,,9:2
15Helium isotopes in lithospheric mantle:Evidence from Tertiary basalts of the western USA显示文摘Dodson A Depaolo D 1998Geochim Cosmochim Acta1998,62,:2
16Vegetation and Climate Variations at Taibai, Qinling Mountains in Central China for the Last 3 500 cal BP显示文摘Pollen records of two swamp sections, located at Taibai Mountain, the highest peak in the Qinling Mountains of central China, show variations of vegetation and climate for the last 3 500 cal BP. The pollen assemblage at the Foyechi and Sanqingchi sections and the surface soil pollen allowed us to reconstruct a high-altitude vegetation history at Taibai Mountain for the first time. The data indicated that there was a cold-dry climate interval between 3 500 and 3 080 cal BP and a relatively warm and wet period compared with the present from 3 080 to 1 860 cal BP. The warmest period in the late Holocene on Taibai Mountain was from 1 430 to 730 cal BP, with an approximate 2℃ increase in mean annual temperature compared with today.There was a relatively cool-dry climate interval from 730 to 310 cal BP. After 310 cal BP, a mountain tundra vegetation developed again and the position of the modern tree line was established.Xiao-Qiang LI John DODSON Jie ZHOU Su-Min WANG Qian-Li SUN 2005Journal of Integrative Plant Biology2005,47,8:2
17A Risk Model to Predict 90-Day Mortality among Patients Undergoing Hepatic Resection显示文摘Omar Hyder Carlo Pulitano Amin Firoozmand Rebecca Dodson Christopher L. Wolfgang Michael A. Choti Luca Aldrighetti Timothy M. Pawlik 2013Journal of the American College of Surgeons2013,,6:2
18河西走廊4200年以来青铜冶炼的元素地球化学记录显示文摘金属的使用与冶炼是人类社会发展过程中一项革命性事件。河西走廊地区全新世条湖湖相沉积元素地球化学记录显示,10500-9500cal aBP和8000-7200cal aBP时段Cu、Pb、Zn、Ni元素含量高值区,分别对应了早全新世增温期冰川融水量增加和全新世适宜期季风降水的增强。Cu、As、Pb、Zn、Ni含量在4200-3700cal aBP时段出现最高峰值,另外Cu、Pb、Zn、Ni4种元素在3000-2700和2100-1900cal aBP时段出现较高峰值。4200-3700cal aBP时段元素异常记录了我国西北地区最早的青铜冶炼,As元素是这一时期青铜合金的主要成份。另外,西周时期(3000-2700cal aBP)和汉代(2100-1900cal aBP)Cu、Pb、Zn、Ni元素峰值,可能是先民青铜冶炼的结果。元素地球化学记录不仅可以判定早期青铜冶炼的起迄时间,也提供了甄别不同时代青铜合金元素组成变化的信息。李小强 纪明 Dodson J. 周新郢 赵克良 孙楠 杨青 2010湖泊科学2010,22,1:2
19Analysis of factors associated with durable remission of diabetes after Roux-en- Y gastric bypass显示文摘Silas M. Chikunguwo Luke G. Wolfe Patricia Dodson Jill G. Meador Nancy Baugh John N. Clore John M. Kellum James W. Maher 2010Surgery for Obesity and Related Diseases2010,,3:2
20中国黄土高原北部地区新石器-青铜时代农业结构演变及其对区域生态环境的适应显示文摘本文分析并测定了从15个位于黄土高原北部的遗址中浮选的炭化植物遗存的年代及数量,讨论了该地区新石器-青铜时代农业结构的变化、发展及自适应。研究表明,该地区粟的占比随着遗址年代的推移呈现出上升趋势,证明了先民的农业技术随时间变化而发展;受季风降水特征影响,东南部灌丛草原区粟的占比随时间变化上升趋势明显,西北部干草原区则变化较弱,证明环境的差异也造成了农业模式的不同;在干旱气候条件限制下,自中全新世以来黄土高原北部地区的主要作物始终为粟和黍,粟作农业奠定了黄土高原乃至中国北方的文明基础。包易格 李小强 刘汉斌 赵克良 John Dodson 沈慧 张贵林 王建 周新郢 2020人类学学报2020,39,3:2
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