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290篇 您的检索式:作者名="M.R"
    题名 作者 年代 出处 被引量
1Comprehensive study on the results of tension leg platform responses in random sea显示文摘Compliant offshore structures are used for oil exploitation in deep water. Tension leg platform (TLP) is a suitable type for very deep water. The nonlinear dynamic response of TLP under random sea wave load is necessary for determining the maximum deformations and stresses. Accurate and reliable responses are needed for optimum design and control of the structure. In this paper nonlinear dynamic analysis of TLP is carried out in both time and frequency domains. The time history of random wave is generated based on Pierson-Moskowitz spectrum and acts on the structure in arbitrary direction. The hydrodynamic forces are calculated using the modified Morison equation according to Airy’s linear wave theory. The power spectral densities (PSDs) of displacements, velocities and accelerations are calculated from nonlinear responses. The focus of the paper is on the comprehen-sive interpretation of the responses of the structure related to wave excitation and structural characteristics. As an example a case study is investigated and numerical results are discussed.TABESHPOUR M.R GOLAFSHANI A.A. SEIF M.S 2006Journal of Zhejiang University-Science A(Applied Physics & Engineering)2006,7,8:15
2超甜玉米单倍体悬浮细胞系的建立及其生长特性显示文摘从超甜玉米的花药培养物中,筛选出28个具有高度胚胎发生能力的类型Ⅱ愈伤组织系,这种愈伤组织质地松散,易于分散,可以长期进行继代培养。将3个月龄的类Ⅱ愈伤组织接种在液体培养基中进行振荡培养,建立起分散程度很好的8个悬浮细胞系。实验结果说明,培养基中加入酪蛋白水解物(CH)和2-(N-吗啉代)乙基磺酸(MES)对悬浮细胞的生长是有利的。培养基的 pH 迅速下降吋,细胞的增殖十分缓慢,当培养基的 pH 值开始升高时,细胞的增殖也显著加快。利用滋养培养法,可以使悬浮细胞的愈伤组织形成率大大提高(比对照高11.8—19.7倍),并在低密度下达到较高的(41.3%)植板率。染色体计数表明,继代培养6个月之后,88.0%的悬浮细胞和95.2%的再生植株的染色体数保持着2n=x=10的单倍性水平。孙敬三 路铁刚 M.Rndahl 1989Acta Botanica Sinica1989,31,10:13
3莜麦花药培养和单倍性悬浮细胞培养物的建立显示文摘对花粉处于单核中期的莜麦(Avena nuda)花药进行了离体培养,发现外源激素对莜麦花粉愈伤组织的形成不但没有促进作用,反而有明显的抑制作用。在不含任何激素只含1%活性碳的 MS 培养基上得到了最高的花粉愈伤组织诱导率(14.7%)。但愈伤组织的分化率极低,在126块愈伤组织中只有4块具分化苗的能力,其中3块分化出绿色植株,1块分化出白色植株。对分别来自3块愈伤组织的3株绿苗进行了根尖染色体检查,结果显示,3棵绿色植株中2株为单倍体(2n=3x=21),1株为二倍体(2n=6x=42)。将花粉愈伤组织置于液体培养基中进行悬浮培养,得到了分散好,生长快的悬浮细胞培养物。悬浮细胞经1年左右的继代培养仍基本保持着单倍体特性。孙敬三 路铁刚 M.R Sndahl 1991Acta Botanica Sinica1991,33,6:9
4Malunion in displaced intracapsular fracture of femoral neck: A rare case显示文摘Nikhil Verma M.R Singh Rehan UI Haq Aditya N. Aggarwal Anuj Jain 2015Chinese Journal of Traumatology2015,18,5:2
5香港的酸雨和地表水酸度显示文摘通过对香港新界小流域水文过程中pH值的监测,结果表明,在研究的5年期间,降雨pH值的中位数年变化为4.5~4.7,而溪流的pH值接近中性,其中位数年变化为6.6~6.8.研究表明。管东生 Peart M.R 2001中国环境科学2001,21,4:2
6Miniplate removal in trauma and orthognathic surgery—a retrospective study显示文摘M.R Mosbah D Oloyede D.A Koppel K.F Moos D Stenhouse 2003International Journal of Oral & Maxillofacial Surgery2003,,2:2
7Heat stress in lactating dairy cows: a review显示文摘C.T Kadzere M.R Murphy N Silanikove E Maltz 2002Livestock Production Science2002,,1:2
8Influence of deformation conditions and texture on the high temperature flow stress of magnesium AZ31显示文摘M.R Barnett 2001Journal of Light Metals2001,,3:2
9Use of wild trout for PBDE assessment in freshwater environments: Review and summary of critical factors显示文摘Certain wild animals represent sentinels to address issues related to environmental pollution,since they can provide integrative data on both pollutant exposure and biological effects.Despite their technological benefits,PBDEs are considered a threat to environmental health due to their persistence,toxicity,and capacity to be accumulated.These pollutants have been found geographically widespread in fish,particularly in predator species such as trout.The aim of this work is to critically review the applicability and usefulness of wild trout for assessing PBDEs in freshwater environments.Reviewed reports include data from highly industrialized areas as well as areas from remote regions with relatively low human activity,including European and North American great lakes and freshwater environments in Europe,Greenland,subarctic areas and Patagonia,respectively.A summary of relevant factors were grouped into organism-specific factors(food habits,age,size,lipid content,sex and reproduction,tissue type,mechanism of contaminant uptake and metabolism),and PBDE levels in the surrounding environment(sediment).Five wild trout species[rainbow trout(Oncorhynchus mykiss),brown trout(Salmo trutta),lake trout(Salvelinus namaycush),arctic char(Salvelinus alpinus),and brook trout(Salvelinus fontinalis)],collected worldwide within the 1994 to present time frame,were considered.Multivariate techniques(principal component analysis-PCA)and mapping approach,showed clear differences in geographic distribution patterns of PBDE levels in trout depending on the region studied:wild trout from European and North American great lakes have the highest PBDE loads.This pattern could be due to high industrial activity at these locations.A correlational approach used to explore intraspecific relationships between PBDE levels and morphometry,showed positive relationships only for brown trout.Further,brown trout showed the highest trout-to-sediment ratios,which is suggestive of a relatively greater capacity of this species to accumulate PBDEs in relation to sediment levels.Overall,results suggest that adult wild trout could be useful as a PBDE bioindicator.Juan M.Ríos Nerina B.Lana Paula Berton Néstor F.Ciocco Jorgelina C.Altamirano 2015Emerging Contaminants2015,1,1:2
10Gene-specific timing and epigenetic memory in oocyte imprinting显示文摘Lucifero D Mann M.R Bartolomei M.S Trasler J.M 0,,:1
11Communication within sport teams:Jungian preferences and group dynamics显示文摘Beauchamp M.R Maclachlan A Lothian A.M 0,,19:1
12DNA methylation is a primary mechanism for silencing postmigratory primordial germ cell genes in both germ cell and somatic cell lineages显示文摘Maatouk D.M Kellam L.D Mann M.R W Lei H Li E Bartolomei M.S Rcsnick J.L 0,,17:1
13In planta functions of the Arabidopsis cytokinin receplor family显示文摘Higuchi M Pischke M.S M(a) h(o)nen A.P Miyawaki K Hashimoto Y Seki M Kobayashi M Shinozaki K Kato T Tabata S Helarintta Y Sussman M.R Kalimoto T 0,,:1
14The need to belong:Desire for interpersonal attachments as a fundamental human motivation显示文摘Baumeister R.F Leary M.R 0,,:1
15Characterization of cyclodextrin glycosyltransferase immobilized on silica microspheres via aminopropyltrimethoxysilane as a 'spacer arm'显示文摘Matte C.R Nunes M.R Benvenutti E.V 0,,:1
16Rethinking the value of choice:A cultural perspective on intrinsic motivation显示文摘Iyengar S.S Lepper M.R 0,,:1
17Neural circuitry underlying the regulation of conditioned fear and its relation to extinction显示文摘Delgado M.R Nearing K.I LeDoux J.E Phelps E.A 0,,5:1
18Phosphorus dynamics in the rhizosphere of perennial ryegrass ( Lolium perenne L.) and radiata pine ( Pinus radiata D. Don.)显示文摘C.R Chen L.M Condron M.R Davis R.R Sherlock 2002Soil Biology and Biochemistry2002,,4:1
19查看详情显示文摘Kessler M.R 0,,:1
20Biased assimilation and attitudepolarization:The effects ofprior theories on subsequently considered evidence显示文摘LORD C.G ROSS L LEPPER M.R 0,,:1
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