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676篇 您的检索式:作者名="HEIMANN"
    题名 作者 年代 出处 被引量
1京郊典型集约化“农田-畜牧”生产系统氮素流动特征显示文摘城郊畜牧业的集约化发展在满足人们日益增长的肉蛋奶等动物性产品需求的同时,也带来了巨大的环境压力。本文利用养分流动和模型分析的方法,分析北京市郊区某村三种不同类型'农田-畜牧'生产系统(大型集约化种猪场、种养结合小规模生态养殖园和集约化单一种植区)的氮素流动特征。结果表明:饲料是集约化种猪场和生态养殖园氮素输入的主要来源,饲料投入氮量分别为12469.0和9268.5 kg.hm-.2a-1);集约化种猪场农牧体系间生产脱节,致使农田氮素输入主要依赖于化肥投入,化肥氮输入量(435.0 kg.hm-.2a-1)占农田氮素输入量的82.7%。相反,生态养殖园农牧体系结合紧密,猪粪尿氮还田比例达28.6%,这使得园区化肥氮输入量仅为135.0 kg.hm-.2a-1,因此畜禽粪尿的合理循环利用可作为减少化肥投入的有效途径;集约化种猪场、生态养殖园和单一种植区农牧生产系统氮素利用效率分别为18.8%、20.6%和17.3%,均处于较低水平;集约化种猪场猪粪尿在猪舍和储藏处理过程的氮素损失率为15.8%和25.4%,分别低于小规模生态养殖园相应损失率约8.7和4.8个百分点;生态养殖园粪肥氮还田量高,导致农田氮素盈余量高达1962.8 kg.hm-.2a-1,未能实现生态型养殖的理想效果,优化氮素管理、确定合理的消纳畜禽粪尿的农田面积和调整畜禽养殖密度是解决该问题的关键。侯勇 高志岭 马文奇 Lisa Heimann Marco Roelcke Rolf Nieder 2012生态学报2012,32,4:28
2当代全球碳循环和100年前Arrhenius与Hgbom的预见的回顾显示文摘全球碳循环研究计划强调两个基本问题。第一个是关于碳系统对人为扰动的直接响应,即化石燃烧和土地利用变化排放出的过多的CO_2如何分布在大气、陆地和海洋中,以及这种分布如何随时间而变化?第二个问题是反馈问题,即气候变化如何反过来影响自然界碳循环并导致大气CO_2浓度的变化?本文评述解决这些问题的观测约束条件:①记录最近100年来CO_2浓度增加的大气直接观测和冰芯测量;②用观察氧和碳同位素的新方法和模型模拟都得到当前大气CO_2的收支估值,在此估值中海洋的作用如何?③通过CO_2全球监测网揭示的空间分布信息。100年前Arrhenius与他的同事(地质学家Hogbom)都注意到了控制大气中CO_2浓度的主要过程,然而他们的兴趣在于长期特征而没有察觉工业排放对全球气候的直接威胁。今天,我们能够定量确定和模拟人为扰动的直接影响,尽管大量不确定因素依然存在,特别是在地球生物圈过程方面。然而,我们对许多碳循环气候反馈的理解还是很有限的,这个问题在未来几十年里将始终是一个具有挑战性的课题。Martin Heimann 孙达 陈洪滨 1997人类环境杂志1997,26,1:8
3不锈钢在烟气脱硫装置中长时间使用经验显示文摘Bernd Beckers 孙长庆 Winfried Heimann Malin Snis 2004化工设备与防腐蚀2004,7,3:5
4Spreading depression and focal venous cerebral ischemia enhance cortical neurogenesis显示文摘Endogenous neurogenesis can arise from a variety of physiological stimuli including exercise, learning, or 'enriched environment' as well as pathological conditions such as ischemia, epilepsy or cortical spreading depression. Whether all these conditions use a common trigger to set off endogenous neurogenesis is yet unclear. We hypothesized that cortical spreading depression(CSD) induces neurogenesis in the cerebral cortex and dentate gyrus after cerebral venous ischemia. Forty-two Wistar rats alternatively underwent sham operation(Sham), induction of ten CSDs or venous ischemia provoked via occlusion of two adjacent superficial cortical vein followed by ten induced CSDs(CSD + 2-VO). As an additional control, 15 na?ve rats received no intervention except 5-bromo-2′-deoxyuridine(Brd U) treatment for 7 days. Sagittal brain slices(40 μm thick) were co-stained for Brd U and doublecortin(DCX; new immature neuronal cells) on day 9 or Neu N(new mature neuronal cells) on day 28. On day 9 after sham operation, cell proliferation and neurogenesis occurred in the cortex in rats. The sole induction of CSD had no effect. But on days 9 and 28, more proliferating cells and newly formed neurons in the ipsilateral cortex were observed in rats subjected to CSD + 2VO than in rats subjected to sham operation. On days 9 and 28, cell proliferation and neurogenesis in the ipsilateral dentate gyrus was increased in sham-operated rats than in na?ve rats. Our data supports the hypothesis that induced cortical neurogenesis after CSD + 2-VO is a direct effect of ischemia, rather than of CSD alone.Ryo Tamaki Samuel Ige Orie Beat Alessandri Oliver Kempski Axel Heimann 2017Neural Regeneration Research2017,12,8:3
5A unified structural approach to linear carbon polytypes显示文摘Heimann R B Kleiman J Salansky N M 1984Nature1984,306,:2
6GM-CSF-mobilized peripheral blood CD34+ cells differ from steady-state bone marrow CD34+cells in adhesion molecule expression 显示文摘Watanbe T Dave B Heimann DG 1997Bone MarrowTansplant1997,19,:2
7Bronsted acidification observed during hydrothermal treatment of a calcium montmorillonite 显示文摘Heimann 1993Clays and Clay minerals1993,41,:2
8Pars plana vitrectomy and silicone oil injection proliferative diabetic retinopathy显示文摘 Dahl B Dimopoulos S 1989Graefe Arch Clin Exp Ophthalmol1989,227,2:1
9A new model of skull base reconstruction following expanded endonasal or transoral approaches--long-term results in primates 显示文摘Charalampaki P Heimann A Kockro RA 2008Eur Surg Res2008,41,2:1
10Antiproliferative Wirkung von genistein auf kuhivierte retinale Pigmentepithelzellen vom Schwein显示文摘Krott R Lebek J Grisanti S Esser P Heimann K 2000Olgatlmlmologica2000,214,4:1
11Vitrectomy for macular detachment associated with optic nerve pits显示文摘Bartz-Schmidt KU Heimann K Esser P 1995Int Ophthalmol1995,19,6:1
12Retinal detachment after phacoemulsification in high myopia: analysis of 2356 cases 显示文摘Neuhann IM Neuhann TF Heimann H 2008J Cataract Refract Surg2008,34,10:1
13Aging,progression,and phenotype in breast cancer显示文摘Heimann R Hellman S 1998J Clin Oncol1998,16,8:1
14Substratum adhesion and gliding in a diatom are mediated by extracellular proteoglycans显示文摘Lind J L Heimann K Miller E A 0,,02:1
15Global and hemispheric CO sinks deduced from changes in atmospheric O2 concentration显示文摘 Piper S C Heimann M 1996Nature1996,381,:1
16Cell adhesion molecule expression on CD34 + cells in grafts and time to myeloid and platelet recovery after autologous stem cell transplantation显示文摘WATANABE T DAVE B HEIMANN D G 1998Exp Hematol1998,26,1:1
17Growth and optical activity of Strontium tantalum gallium silicon oxide (Sr3TaGa3Si2O14, STGS) 显示文摘HEIMANN R B HENGST M ROSSBERG M 2003Phys Stat Sol(a)2003,198,2:1
18Relaxin reduces fibrosis in models of progressive and established hepatic fibrosis显示文摘Bennett RG Heimann DG Tuma DJ 2009Ann N Y Acad Sci2009,1160,:1
19Ca2+ channels in retinal pigment epithelial cells regulate vascular endothelial growth factor secretion rates in health and diaease显示文摘Rosenthal R Heimann H Agostini H 2007Mol Vis2007,13,:1
20Graphite sheet coating for improved thermal oxidative stability of carbon fiber reinforced/PMR-15 composites显示文摘Miller S Papadopoulos D Heimann P 2007Composites Science and Technology2007,67,10:1
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