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402篇 您的检索式:作者名="Jennings F"
    题名 作者 年代 出处 被引量
162 kaBP以来湖光岩玛珥湖沉积物有机碳同位素记录及古气候环境意义显示文摘湖光岩玛珥湖HUG B孔岩心记录了62kaBP以来的古气候、古环境变化信息。全岩有机碳同位素组成(δ13CTOC)分析表明,62kaBP以来δ13CTOC值变化比较明显,其变化范围为-28.5‰~-15.5‰。结合孢粉和有机地球化学指标进行综合分析,湖光岩玛珥湖δ13CTOC变化曲线可划分为6个演化阶段:62~58和48~40.5kaBP两个时段的δ13CTOC值偏负,沉积物中有机质主要来源于热带—亚热带地区的陆生C3森林植被,反映了温暖潮湿的气候环境;58~48和40.5~17.2kaBP期间δ13CTOC值明显偏正,沉积物中有机质主要源自C4草本植物,反映了湖光岩地区有效降水量减少、干旱程度增加导致湖光岩玛珥湖湖面下降,大量C4草本植物生长在暴露的湖滨岸;17.2~4kaBP时段内δ13CTOC值尽管存在更加频繁的波动,但总体呈现逐渐偏负的趋势,反映了暖湿和冷干气候多次交替但总体上逐渐变暖、变湿的气候环境;4kaBP以来δ13CTOC值存在逐渐偏正的趋势,虽然不排除人类活动的影响,但很可能反映了干旱程度的再次增加。综合分析表明,有效降水量(降水量-蒸发量)是控制湖光岩玛珥湖地区C3/C4植物相对生物量变化的主导因素。湖光岩玛珥湖有机碳同位素的研究结果支持区域气候环境而不是大气CO2浓度变化是末期冰期以来热带低纬度地区C3/C4植被相对生物量变化的主要原因。刘强 顾兆炎 刘嘉麒 游海涛 吕厚远 储国强 祁向雷 Jorg F W Negendank Jens Mingram Georg Schettler 2005海洋地质与第四纪地质2005,25,2:34
2Vitamin D deficiency in cirrhosis relates to liver dysfunction rather than aetiology显示文摘AIM: To examine the vitamin D status in patients with alcoholic cirrhosis compared to those with primary biliary cirrhosis. METHODS: Our retrospective case series comprised 89 patients with alcoholic cirrhosis and 34 patients with primary biliary cirrhosis who visited our outpatient clinic in 2005 and underwent a serum vitamin D status assessment. RESULTS: Among the patients with alcoholic cirrhosis, 85% had serum vitamin D levels below 50 nmol/L and 55% had levels below 25 nmol/L, as compared to 60% and 16% of the patients with primary biliary cirrhosis, respectively (P < 0.001). In both groups, serum vitamin D levels decreased with increasing liver disease severity, as determined by the Child-Pugh score. CONCLUSION: Vitamin D deficiency in cirrhosis relates to liver dysfunction rather than aetiology, with lower levels of vitamin D in alcoholic cirrhosis than in primary biliary cirrhosis.Mikkel Malham SΦren Peter JΦrgensen Peter Ott JΦrgen Agnholt Hendrik Vilstrup Mette Borre Jens F Dahlerup 2011World Journal of Gastroenterology2011,17,7:15
3Second harmonic generation spectroscopy on hybrid plasmonic/dielectric nanoantennas显示文摘Plasmonic nanoantennas provide unprecedented opportunities to concentrate light fields in subwavelength-sized volumes.By placing a nonlinear dielectric nanoparticle in such a hot spot,one can hope to take advantage of both the field enhancement provided by nanoantennas and the large,nonlinear optical susceptibility of dielectric nanoparticles.To test this concept,we combine gold gap nanoantennas with second-order,nonlinear zinc sulfide nanoparticles,and performsecond harmonic generation(SHG)spectroscopy on the combined hybrid dielectric/plasmonic nanoantennas as well as on the individual constituents.We find that SHG from the bare gold nanoantennas,even though it should be forbidden due tosymmetry reasons,is several orders ofmagnitude larger than that of the bare zinc sulfide nanoparticles.Even stronger second harmonic signals are generated by the hybrid dielectric/plasmonic nanoantennas.Control experiments with nanoantennas containing linear lanthanumfluoride nanoparticles reveal;however,that the increasedSHG efficiency of the hybrid dielectric/plasmonic nanoantennas does not depend on the nonlinear optical susceptibility of the dielectric nanoparticles but is an effect of the modification of the dielectric environment.The combination of a hybrid dielectric/plasmonic nanoantenna,which is only resonant for the incoming pump light field,with a second nanoantenna,which is resonant for the generated second harmonic light,allows for a further increase in the efficiency of SHG.As the second nanoantenna mediates the coupling of the second harmonic light to the far field,this double-resonant approach also provides us with control over the polarization of the generated light.Heiko Linnenbank Yevgen Grynko Jens Förstner Stefan Linden 2016Light(Science & Applications)2016,5,1:7
4当前围手术期处理模式:北欧五国结直肠外科医生调查显示文摘Kristoffer Lassen Pascal Hannemann Olle Ljungqvist Ken Fearon Cornelis H C Dejong Maarten F von Meyenfeldt Jonatan Hausel Jonas Nygren Jens Andersen Arthur Revhaug 王东 2005英国医学杂志中文版2005,8,6:3
5Development and test of small-scale batch fired Straw boilers in Denmark显示文摘Erik F K Jens K K 2004Biomass and Bioenergy2004,26,:1
6Developing multiAgent systems: the gaia methodology显示文摘F Zambonelli N Jennings M Wooldridge 2003ACM Transactions on Software Engineering and Methodology2003,12,3:1
7Physical properties of R-PET/ CD-PET poly blended hollow filaments their kinetics of alkaline hydrolysis显示文摘Hsiao K J Jen Z F Yang J C 2002J Polym Res2002,9,12:1
8Polymeric materials andtheir orientation techniques for second-order nonlinear optics显示文摘 Lee K S Jen AKY 2003ADV POLYM SCI2003,161,:1
9A simple fast hybrid pattern-matching algorithm 显示文摘FRANEK F JENNINGS C G SMYTH P W F 2007Journal of Discrete Algorithms2007,4,5:1
10Urinary enzyme measurements as early indicators of renal insult in type 2 diabetes显示文摘Kalansooriya A Jennings P Haddad F 0,,04:1
11Insights between environmentalscanning activities and Porter's generic strategies: an empirical analysis 显示文摘JENNINGS D F LUMPKIN J R Journal of M anagement0,18,4:1
12Physics and kinetics of alkaline hydrolysis of cationic dyeable poly ( ethylene terephthalate ) (CDPET) and polyethylene glycol (PEG)-modified CDPET polymers: Effects of dimethyl 5-sulfoisophthalate sodium salt / PEG content and the number average molecular weight of the PEG显示文摘Hsiao K J Jen Z F Tang J W 2005J Appl Polym Sci2005,98,2:1
13The ante- cedents and consequences of firm-level entrepreneurship: the state of the field 显示文摘ZAHRA S A JENNINGS D F KURATKO D F 1999Entrepreneurship Theory and Practice1999,,24:1
14The antecedents and consequences of firm-level entrepreneurship:the state of the field显示文摘ZAHRA S A JENNINGS DANIEL F KURATKO DONALD F 1999Entrepreneurship theory and practice1999,1999,:1
15Aurantiamine, a diketopiperazine from two varieties of Penicilium aurantiogriseum 显示文摘Thomas O L Jens C F Soren R J 1992Phytochemistry1992,31,5:1
16Hydroxyl radical in living systems and its separation methods 显示文摘CHENG Fu-chou JEN J F TSAI T H 2002Journal of Chromatography B2002,781,1:1
17Antibacterial activity of marine-derived fungi显示文摘Carsten C Oscar C Jens C F 1999Mycopathologia1999,143,:1
18A field study of green roof hydrologic and water quality performance 显示文摘Hathway A M Hunt W F Jennings G D 2008Transaction of the ASABE2008,51,1:1
19Intracranial germcelltumors:natural history and pathgenesis显示文摘Jennings MT Gelman R Hochbeg F 1985J Neurosurg1985,63,:1
20A Simple Fast Hybrid Pattern-matching Algorithm显示文摘Franek F Jennings C G Smyth P W F 2007Journal of Discrete Algorithms2007,4,5:1
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