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329篇 您的检索式:作者名="D.R."
    题名 作者 年代 出处 被引量
1乳腺肿块的超声弹性成像表现并特别关注乳腺纤维腺瘤的诊断显示文摘本研究的目的是应用超声弹性成像显示乳腺肿块并分析其表现,尤其是乳腺纤维腺瘤。本研究最初包括235例病人共计302个乳腺病变,均经针吸活检取得病理证实。其中270个病变在常规超声检查中呈实质性肿块,作为本研究资料。其中115个(42.6%)组织学证实为纤维腺瘤,155个(57.4%)为非纤维腺瘤。这些肿块又被进一步分为纤维囊性病变、潜在低度恶性病变和恶性病变。纤维腺瘤也根据组织学表现分为3个亚型,以便根据弹性成像评分进行对照分析。E.F.C. Fleury J.F Rinaldi S. Piato J.C.V. Fleury D.R. Junior 范璐(译) 刘筠(校) 2009国际医学放射学杂志2009,32,4:11
2非硫化矿物浮选综述显示文摘非硫化矿浮选实践可形象地描述为科学理论和工艺发展的结合。在过去几十年里 ,尽管开展了大量的基础研究 ,并在许多理论方面取得长足的进展 ,但在某种程度上与硫化矿浮选不同 ,非硫化矿选矿厂实践中开发的工艺常常超前于理论研究。过去已发表了一些突出理论和选矿厂实践方面的优秀评述性文章。本文也对非硫化矿浮选进行综述 ,主要强调了硫化矿和非硫化矿浮选的主要区别 ,评述了非硫化矿浮选的最新进展 。D.R.纳加雷 尚衍波 张覃 李长根 2002国外金属矿选矿2002,39,4:8
3Microstructural evolution of aluminum alloy during friction stir welding under different tool rotation rates and cooling conditions显示文摘The microstructural evolution during friction stir welding(FSW) has long been studied only using one single welding parameter. Conclusions were usually made based on the final microstructure observation and hence were one-sided. In this study, we used the 'take-action' technique to freeze the microstructure of an Al-Mg-Si alloy during FSW, and then systematically investigated the microstructures along the material flow path under different tool rotation rates and cooling conditions. A universal characteristic of the microstructural evolution including four stages was identified, i.e. dynamic recovery(DRV), dislocation multiplication, new grain formation and grain growth. However, the dynamic recrystallization(DRX)mechanisms in FSW depended on the welding condition. For the air cooling condition, the DRX mechanisms were related to continuous DRX associated with subgrain rotation and geometric DRX at high and low rotation rates, respectively. Under the water cooling condition, we found a new DRX mechanism associated with the progressive lattice rotation resulting from the pinning of the second-phase particles.Based on the analyses of the influencing factors of grain refinement, it was clearly demonstrated that the delay of DRV and DRX was the efficient method to refine the grains during FSW. Besides, ultra-high strain rate and a short duration at high temperatures were the key factors to produce an ultrafine-grained material.X.H. Zeng P. Xue L.H. Wu D.R. Ni B.L. Xiao K.S. Wang Z.Y. Ma 2019Journal of Materials Science & Technology2019,35,6:6
4《易经》的符号逻辑显示文摘一、卦书《易经》是中国传统文化公认的宏伟经典著作。其思想比神秘的宗教玄学要早。至今几乎在世界文献中,还没有其他著作能享有这种难以估量的特别声誉。这部著作的独特之处已超出其外部图象的涵义。《易经》的基本轮廓是由64卦组成,六十四卦是用二进制的结构符号,即用断线(阴爻)和连线(阳爻),以六爻为一组的各种排列组合方案构成。64卦的阴阳爻符号都与中国文字(书写符号)有联系,卦爻辞是由短而表面上看来无联系的辞句构成。64卦的原始思想是什么?经文编排原则的根据是什么?这些问题至今仍不清楚。它在中国出现后,对其理论的形成争论了800年,其重要意义在于它决定了整个中国的哲学史(图1)。D.R.斐德烈 赫英臣 1993周易研究1993,,1:4
5Influence of alloying elements and microstructure on aluminium sacrificial anode performance: case of Al–Zn显示文摘D.R. Salinas S.G. García J.B. Bessone 1999Journal of Applied Electrochemistry1999,,9:3
6Global estimates of diabetes prevalence for 2013 and projections for 2035 for the IDF Diabetes Atlas显示文摘L. Guariguata D.R. Whiting I. Hambleton J. Beagley U. Linnenkamp J.E. Shaw 2013Diabetes Research and Clinical Practice2013,,:3
7A clinicopathologic and immunohistochemical study of 35 anaplastic carcinomas of the pancreas with a review of the literature显示文摘Edina Paal Lester D.R. Thompson R.Allen Frommelt Ronald M. Przygodzki Clara S. Heffess 2001Annals of Diagnostic Pathology2001,,3:3
8水电站使鱼群改变游向的音响系统显示文摘为了保护鱼类,研制了各种使鱼群偏离水电站进水口的“行为”装置,包括气泡屏障、人工光屏和水下音响装置。介绍音响装置的原理、设计及试验。试验结果表明,音响装置使通过水轮机的小娃鱼减少73.6%,鲑鱼以外的淡水鱼减少91。5%。水下音响装置提供了一种较为经济的解决方法。D.R.兰伯特 刘忠清 1997水利水电快报1997,18,10:3
9浮选硫化矿物和非硫化矿物的新型聚合物抑制剂显示文摘为了简单或复杂成分的硫化矿和非硫化矿的有效分离 ,浮选作业广泛使用了各种抑制剂。这些抑制剂可简单地分为 3类 :无机抑制剂、低分子有机抑制剂和高分子有机抑制剂。高分子抑制剂的应用仅局限于很小的范围 :如几种聚糖 (古尔胶、淀粉和羧甲基纤维素等 )、几种其它聚合物和有机副产品。近几年来 ,Cytec工业公司研制了几种合成聚合物抑制剂 ,以克服传统抑制剂的许多缺点。这些合成抑制剂具有以下很多优点 :用量性能比高 ,处理成本低 ,易于控制 ,毒性小 ,运输和储存危险性小 ,结构易于调整 ,以适应不同用途和矿石类型的变化 ,药剂质量稳定。本文根据实验室和工业数据 ,对合成聚合物抑制剂的化学性质。D.R.纳加雷 谭程鹏 陆建平 2001国外金属矿选矿2001,38,9:3
10Aroma volatile biosynthesis in apples affected by 1-MCP and methyl jasmonate显示文摘S. Kondo S. Setha D.R. Rudell D.A. Buchanan J.P. Mattheis 2004Postharvest Biology and Technology2004,,1:3
11Genetic variability and divergence studies in pod and seed traits of Pongamia pinnata(L.) Pierre., accessions in Bay Islands显示文摘In this study, we assessed the variability in pod, seed traits and oil content of 24 accessions of Pongamia pinnata collected from different parts of the Andaman and Nicobar Islands, India. The experiment was conducted at the Central Agricultural Research Institute, Port Blair during 2010 to 2011. The variability studies for pod and seed traits revealed that, the accession CPT-6 collected from New Wandoor in South Andaman recorded the maximum values for eight traits viz. pod length(75.51 mm), pod width(34.62 mm), pod thickness(17.55 mm), 100 pod weight(770.33 g), seed width(21.23 mm), 100 seed weight(377.00 g), oil percentage(43.92%) and germination percentage(94.7%). However, the maximum seed length(26.46 mm) was recorded from CPT 2 and the maximum pod-seed ratio was obtained from CPT 13 and CPT 4(2.50 and 2.44 respectively). The phenotypic and genotypic coefficients of variations were also close to each other for all traits, but the 100 pod and seed weight exhibited higher phenotypic and genotypic coefficient of variation than the other traits. Estimates of broad sense heritability ranged from 0.30(for seed length) to 0.95(pod length) and genetic advance as percent of the mean ranged between 11.66% and 57.40% with seed length giving the lowest value and 100 pod weight giving the highest value. Both the phenotypic and genotypic correlation between pod length, pod width, pod thickness, 100 pod weight, seed width and 100 seed weight and between pod thickness, 100 pod weight, seed width, 100 seed weight and germination percentage were found to be strong. On the basis of non hierarchical Euclidian cluster analysis, 24 accessions were grouped into six clusters. The maximum numbers of seven accessions were included in cluster VI. The maximum intra cluster distance(10.238)shown by cluster VI and the maximum inter cluster distance(17.021) between V and III followed by III and II(15.942). Among the six clusters formed the cluster III recorded maximum oil percentage, 100 pod weight, 100 seed weight, pod length, pod thickness, pod width, seed width and germination percentage, while cluster V recorded maximum pod seed ratio and germination percentage. The present findings suggest that the crossing between accessions of cluster V and cluster III will result in a wide spectrum of variability in subsequent generations.I. Jaisankar M. Sankaran D.R. Singh V. Damodaran 2014Journal of Forestry Research2014,25,2:3
12全球帝国主义与重构的后现代主义显示文摘现代文化和政治已经导致了全球帝国主义,即一种通过一个国家来创建一个无所不包的帝国的尝试。为了战胜这种全球帝国主义,需要从现代世界秩序转向一种后现代世界秩序,其中,以主权为基础的民族国家的无政府秩序将被全球民主所取代。怀特海式的重构的后现代主义为后现代政治的双重任务(抵抗全球帝国主义和建立全球民主)提供了各种文化资源。D.R.格里芬 李艳红(译) 曲跃厚(校) 2006世界哲学2006,,4:2
13MODELS OF ASYNCHRONOUS MRALLEL NONLINEAR MULTISPLITTING RELAXED ITERATIONS显示文摘In the sense of the nonlinear multisplitting and based on the principle of suffi-ciently using the delayed information, we propose models of asynchronous parallelaccelerated overrelaxation iteration methods for solving large scale system of non-linear equations. Under proper conditions, we set up the local convergence theoriesof these new method models.Z.Z. Bai(Institute of Computational Mathematics and Scientific/Engineering Computing,Chinese Academy of Sciences, Beijing, China)D.R. Wang(Depariment of Mathematics, Shanghai University of Science and Technology,Shanghai, China)D.J. Evans(Parallel Algorit 1995Journal of Computational Mathematics1995,13,4:2
14Effect of melt processing conditions on the extent of exfoliation in organoclay-based nanocomposites显示文摘H.R. Dennis D.L. Hunter D. Chang S. Kim J.L. White J.W. Cho D.R. Paul 2001Polymer2001,,23:2
15对个人行为经济理论的一种修正显示文摘加尔布雷斯的主要贡献,在于他对20世纪美国工业社会的经济结构和权力聚散的分析。在分析的过程中,他不时地在有关个人行为的问题上离经叛道:受生产影响的消费(依存效应),个人对私人产品而非公共产品的偏好,金融市场的暴众心理。这些思想间接地表明了这样一种立场,即经济行为与传统智慧的简单性最大化假定相去甚远。行为比起刺激-反应式的最大化要复杂得多:经济代理人之间的活动是相互影响的而不是独立的;市场需求受到供给方面的影响;长期来看,市场调整并不反映消费者的愿望。D.R.法斯费尔德 张宇燕 1991国外社会科学1991,,9:2
16矿业中的计算机模拟:国际动态分析显示文摘计算机模拟是世界上采矿与矿物处理工业中最成功的计算机应用技术之一。将总结可以在微机或者其它类型计算机上使用的几类模拟软件系统,也将讨论曲线拟合、统计分析和模拟模型优化的支持软件,还将探讨综合应用软件系统进行模拟的方法。在讨论商品化通用模拟软件和专用模拟软件应用性能的同时,还将分析模拟的优缺点,从中将得出矿业中模拟的几种未来可能性,给出发展趋势的预测。李仲学 李显靖 D.R.卡拉斯基 J.M.穆特曼斯基 1998国外金属矿山1998,23,2:2
17Improving the hard magnetic properties by intragrain pinning for Ta doped nanocrystalline Ce-Fe-B alloys显示文摘To develop Ce based permanent magnets with high performance/cost ratio, Ta doping is was employed to enhance the magnetic performance of Ce-Fe-B alloys. For melt spun Cei7Fe78-xTaxB6 (x = 0-1) alloys, the coercivity Hc increases from 439 to 553 kA/m with increasing x value from 0 to 0.75. Microstructure characterizations indicate that Ta doping is helpful for grain refinement. A second phase of TaB2 is observed in Ce17Fe77.25Tao.75B6 alloy, which acts as the pinning center of the magnetic domains, resulting in the change of coercivity mechanism from nucleation type to nucleation +pinning type. The micromagnetic simulation confirms that non-magnetic particles within hard magnetic phase can increase the demagnetization field around them and it is crucial for preventing the further magnetization reverse by pinning effect. Take the advantage of Ta doping for enhancing the coercivity, Ce content of Ce-Fe-B alloy can be further cut down to increase the remanence Jr due to the reduced volume fraction of CeFe2 phase and increased Fe/Ce ratio. As a result, a good combination of magnetic properties with Hc = 514 kA/m, Jr = 0.49 T, and the maximum energy product (BH)max = 36 kJ/m^3 have been obtained in Ce15Fe79.25Tao.75B6 alloy. It is expected that the present work can serve as a useful reference for designing new permanent magnetic materials with low-cost.J.S.Zhang W. Li X.F. Liao H.Y. Yu L.Z. Zhao H.X. Zeng D.R. Peng Z.W. Liu 2019Journal of Materials Science & Technology2019,35,9:2
18Mechanisms controlling the durability of thermal barrier coatings显示文摘A.G. Evans D.R. Mumm J.W. Hutchinson G.H. Meier F.S. Pettit 2001Progress in Materials Science2001,,5:2
19易爆岩层中的平巷支护显示文摘在加拿大萨德伯里的劳伦琴大学地质力学研究中心已承担了适用于控制岩爆破坏的支护设计的5年研究计划。对加拿大硬岩矿山中的岩爆破坏机理进行了评述,并提出了支护设计方法。在支护系统的每一构件都实现补强、支撑和维护的功能。阐述了抗爆支护系统中构件的预期的载荷一位移特性.而且提出了适用于从轻微到严重的一系列岩爆条件的推荐的支护系统。支护系统可以设计为:(a)防止触发岩层崩落或岩爆;(b)变形以使容纳岩爆引起的大的强制变形;(c)吸收包含在射出的岩块中的动能。P.K.凯瑟 D.D.坦南特 D.R.麦克里思 卢世宗 1996国外金属矿山1996,21,12:2
20Emerging invasive liver abscess caused by K1 serotype Klebsiella pneumoniae in Korea显示文摘D.R. Chung S.S. Lee H.R. Lee H.B. Kim H.J. Choi J.S. Eom J.S. Kim Y.H. Choi J.S. Lee M.H. Chung Y.S. Kim H. Lee M.S. Lee C.K. Park 2006Journal of Infection2006,,6:2
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