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| 1 | 科学传播的一种当代定义显示文摘 科学传播是一个方兴未艾的实践和研究领域.在过去的20多年间,科学传播活动、课程和从业者的数量稳步上升.…… | T.W.伯恩斯 D.J.奥康纳 S.M.斯托克麦耶 李曦 | 2007 | 科普研究2007,2,6: | 32 |
| 2 | Al_(80)Ni_6Y_8Co_4Cu_2 GLASS ALLOYS CONTAINING NANOSCALEPARTICLES BY ISOTHERMAL ANNEALING OR QUENCHING显示文摘Al80Ni6 Y8 Co4 Cu2 amorphous ribbons were isothermally annealed and a mixed structure consisting of α-Al particle with a size of less than 15nm and Al3Ni compound with a size of about 30nm was obtained. The crystallization kinetics of Al80Ni6 Y8 Co4 Cu2 amorphous alloy shows that the precipitation of α-Al particles is the growth process controlled by diffusion of the solute elements rejected from the growing crystals. By quenching at different cooling rates, a mixed structure consisting of nanoscale α-Al particles and the remaining glass matrix or structure consisting of nanoscale particle (Al phase or Al3Ni compound) with a size of about 100nm was formed. The addition of Co elements and Cu elements to Al-Ni-Y alloy systems increases the glass formation ability of the alloy and the thermal stability of the supercooled liquid region against crystallization, which results from significant difference of atomic size, strong bonding nature among constituent elements and the low diffisivity of the solute elements due to the concentration gradient in the growing front of crystals. | Z. Bian, G. He and G.L. Chen (State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China) J. Lu, D.J. Chen, G.C. Tu, G.J. Chen and X.J. Hu (Shougang Metallurgical Research Institute, Beijing | 2000 | Acta Metallurgica Sinica(English Letters)2000,13,5: | 16 |
| 3 | 如何评价矿山废弃物对地下水和地表水的潜在影响显示文摘本文根据内华达州的实践经验,提出了一种新颖的评价方法。这种方法包括两个步骤,即:描述矿山废弃物的特征和评价其潜在影响。在评价过程中,可以使用一种方法或综合使用几种方法。据称,这种方法在各种水文地质条件下都能获得成功。 | D.J.赫佐格 F.M.福斯格伦 卢共平 吴翻 | 1997 | 国外金属矿山1997,22,2: | 14 |
| 4 | 老年人的肺形态:75岁以上与55岁以下者CT表现的对照研究显示文摘目的描述无症状老年人肺的薄层CT特点。方法本研究经伦理委员会批准,病人签署知情同意书。2组成员(〉75岁老年组和〈55岁年轻组)在门诊头部和腹部CT检查者中选取。连续65例无呼吸系统疾病的志愿者(老年组:40例,18例男性,22例女性;年轻组:16例,男性8例,女性8例)被纳入。行俯卧位薄层CT检查,2位观察者独立对CT一些表现的出现与否及范围进行影像评分,其中包括网状改变、磨玻璃密度影及薄壁囊状气腔。两组间进行比较,并对CT所见与年龄和吸烟史之间的关系行Logistic回归分析。 | S.J. Copley A.U. Wells K.E. Hawtin D.J. Gibson J.M. Hodson A.E. Jacques 葛夕洪(译) 祁吉(校) | 2009 | 国际医学放射学杂志2009,32,4: | 8 |
| 5 | 使用高分辨率的地形数据作为地震场地条件替代指标的研究显示文摘近年来,从美国航天飞机雷达地形测绘使命(SRTM)30弧秒(arcsec)的数字高程模型(DEM)中提出一种估计全球地震场地条件或者地下30m的平均剪切波速(VS30)的新方法。在缺少基于地质和岩土的场地条件分布图的地区,使用该方法的前提是通过VS30的测量值和地形坡度的相关性,可以把地形坡度作为一个可靠估计VS30的替代指标。在这里,我们来检验使用高分辨率(3弧秒和9弧秒)的数字高程模型数据是否能够解析出比使用低分辨率航天飞机雷达地形测绘数据更详细的VS30数据。在全球范围内,并不能全部获得比30弧秒更高分辨率的数字高程模型数据。然而,在存在这些数据的许多地区,这些数据被用来解译地形坡度的精尺度变化,并最终解译VS30。我们使用美国地质调查局地球资源观测和科学(EROS)数据中心的国家高程数据集(NED),在美国几个地区研究使用高分辨率的数字高程模型数据来估计VS30,这些地区包括加利福尼亚州的旧金山湾地区、洛杉矶、加利福尼亚州及密苏里州圣路易斯市。我们将这些结果与全球范围内都能获取的台湾台北市使用9弧秒航天飞机雷达地形测绘数据的例子作比较。使用较高分辨率的美国国家高程数据集重新得到更精细尺度的地形坡度变化,这可更好地与地质和地貌特征相关联,特别是在丘陵-盆地之间的过渡带,确保使用30弧秒的航天飞机雷达地形测绘数据是可行的。然而,统计分析表明,与低分辨率地形所得到的VS30测量值相比,测量值很少或者没有得到改善提高。这表明一些地形平滑处理可能会提供更稳定的VS30估计。此外我们发现,在精度高于30弧秒的航天飞机雷达地形测绘数据有遮盖的地区高程变化范围过大,不能解译出可靠的坡度,特别是在较低坡度的沉积盆地。 | T. I. Allen D.J. Wald 陈鲲(译) 刘爱文(校) | 2009 | 世界地震译丛2009,40,6: | 7 |
| 6 | ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY STUDY OF CORROSION INHIBITION OF MODIFIED LIGNOSULPHONATE FOR CARBON STEEL显示文摘The corrosion inhibition for carbon steel in circulating cooling water by modified lignosulphonate has been investigated using electrochemical impedance spectroscopy technique. Results show that the inhibition efficiency of modified lignosulphonate GCL2 is a great improvement on that of lignosulphonate. The maximum inhibition efficiency of GCL2 reaches 99.21% at the concentration of 400mg·L-1 at 303K. The corrosion inhibition of GCL2 is attributed to forming adsorption film on the metal surface for the electrochemical impedance spectroscopy in GCL2 solution shows more than one time-constant. Moreover, results also indicate that it is more efficient in stirring solution than in still solution for GCL2 because the constant of adsorption in stirring solution is much larger than that in still solution. The adsorption of inhibitor GCL2 follows Langmuir’s adsorption isotherm. | C.H. Yi X. Q. Qiu D.J. Yang H.M. Lou | 2005 | Acta Metallurgica Sinica(English Letters)2005,18,4: | 6 |
| 7 | Refining constitutive relation by integration of finite element simulations and Gleeble experiments显示文摘Thermo-mechanical coupled finite element calculations were carried out to simulate the Gleeble compression of the samples of a titanium alloy(Ti60), and the results are analyzed and compared with the actual compression tests conducted on a Gleeble 3800 thermo-mechanical simulator. The changes in temperature, stress and strain distribution in the samples and the source of error on the constitutive relations from Gleeble hot compression test were analyzed in detail. Both simulations and experiments showed that the temperature distribution in the specimen is not uniform during hot compression, resulting in significant deformation inhomogeneity and non-ignorable error in the flow stress strain relation,invalidating the uniform strain assumption commonly assumed when extracting the constitutive relation from Gleeble tests. Based on the finite element simulations with iterative corrections, we propose a scheme to refine the constitutive relations from Gleeble tests. | D.J. Yu D.S. Xu H. W ang Z.B. Zhao G.Z. Wei R. Yang | 2019 | Journal of Materials Science & Technology2019,35,6: | 6 |
| 8 | 机油乳剂防治策略对柑橘园害虫天敌群落结构与动态的影响显示文摘不同防治策略对果园害虫天敌群落的影响试验结果表明,与果农常规防治策略(主要使用化学合成农药防治害虫)试区相比,机油乳剂防治策略(主要使用机油乳剂防治害虫)试区柑橘害虫天敌群落丰富度较高,且随该防治策略的继续实施而进一步逐年提高,天敌群落均匀度指数较稳定,而天敌群落多样性指数则无明显变化。 | 张志恒 陈亦根 Rae D.J. | 2003 | 中国生态农业学报2003,11,3: | 6 |
| 9 | RELATIONSHIP BETWEEN INFRARED RADIATION AND CRYSTAL STRUCTURE IN Fe-Mn-Co-Cu-O SPINELS显示文摘Ni3+ 和 Cr3+ 做了 Fe-Mn-Co-Cu-O 尖晶石被稳固的阶段 sinfeting 准备了。在尖晶石晶体的转变离子的原子价状态和分布被热力学的原则和水晶的地理论的考虑推断。那些的微观结构和表演被 X 光检查衍射(XRD ) 学习, Fourier 变换红外线(英尺红外) ,并且 IRE-2 红外线的绚烂的仪器。Ni3+ 和 Cr3+ 占据空缺或在尖晶石结构代替另外的离子并且形成多样的尖晶石结构,它在整个乐队展出 0.93 的红外线的不可分的放射率,并且 0.94 在在 14-25 以内的乐队嗯也。在尖晶石晶体的 Fe2O3 和 MnO2 的内容变化,也许,它不同地导致尖晶石的红外线的 radiativity。 | Y. Zhang D.J. Wen | 2008 | Acta Metallurgica Sinica(English Letters)2008,21,1: | 6 |
| 10 | Accuracy details in realistic CFD modeling of an industrial centrifugal pump in direct and reverse modes显示文摘Numerical computation of the flowfield inside a pump is herein used as a numerical laboratory, subject to the limitations of modeling assumptions and to experimental verification. A numerical computation of the flow inside a real industrial centrifugal pump is performed that includes a very sophisticated geometry. Conversely to other computations, in this test case no simplification of the geometry was introduced. Numerical computations are obtained using Spalart-Allmaras turbulence model. A detailed analysis of the turbulent flowstructure is performed for the design point and two off design conditions. Additional computations were performed in order to compare the numerical and experimental pump characteristics; these were obtained under normalized testing conditions. Further computations are presented for the pump working in reverse turbine mode (PAT). Detailed analyses of the flow allow a comparison of the internal flow losses when the pump is operating in direct and reverse mode. This is also useful to help in the selection of an adequate pump geometry that can work in both modes with best efficiency. | J.C. Páscoa F. J. Silva J.S. Pinheiro D.J. Martins | 2010 | Journal of Thermal Science2010,19,6: | 5 |
| 11 | 浮选柱应用领域不断扩大显示文摘浮选柱一直是新建选矿厂所选择的设备,而发展趋势是向直径更大、应用领域更宽的方向发展。 | D.J.默多克 杜岩 | 1993 | 国外金属矿山1993,,10: | 5 |
| 12 | Pretreatment methods to improve sludge anaerobic degradability: A review显示文摘 | H. Carrère C. Dumas A. Battimelli D.J. Batstone J.P. Delgenès J.P. Steyer I. Ferrer | 2010 | Journal of Hazardous Materials2010,,1: | 5 |
| 13 | MANUFACTURING OF ALUMINUM/FLY ASH COMPOSITE WITH LIQUID REACTIVE SINTERING TECHNOLOGY显示文摘The Al/fly ash composites are fabricated by liquid reactive sintering P/M process withfly ash particles as intensifying phases. The reactivity and newly formed phases dur-ing liquid sintering process have been analyzed by combing Thermochemical data basecalculation and XRD characterization. The results show that some of constituents infly ash have reacted with liquid aluminum so that the elemental Si, Fe, Ti as well assome amount of intermetallic compounds occur. The properties of aluminum/fly ashcomposites have been improved. With the fraction of fly ash increase, the compositedensity decreases; the hardness and the modulus of the composite increases, and thecomposite wear resistance are significantly increased. The fly ash reinforced compos-ires represent a sort of low cost product with possible widespread applications in theautomotive, small engine, and electromechanical machinery sectors. | X.F. Zhang, D.J. Wang and G. XieThe Faculty of Material and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, China | 2002 | Acta Metallurgica Sinica(English Letters)2002,15,5: | 5 |
| 14 | 半自磨设计趋势、经济分析、磨机规格和驱动装置显示文摘本文评述了目前应用的各种半自磨机结构设计和驱动装置选择的趋势。评估了这些选择对基本投资和操作成本的影响 ,介绍了关键的技术要点。本文的讨论以北美常用的“扁平式” | D.J.巴拉特 吴建明 李长根 | 2000 | 国外金属矿选矿2000,37,10: | 5 |
| 15 | MRI定量肝灌注指数图:一种可能对抗肿瘤血管生成复合物BIBF1120(一种有效三联血管激酶抑制剂)治疗肿瘤效果可重复评估的方法显示文摘肝转移灶由肝动脉供血,造成肝灌注指数(HPI)增高。本研究的目的是用动态增强MRI定量分析肝转移灶在接受一种抗血管生成新药治疗前后的灌注指数。10例已知肝转移瘤的病人接受了动态增强MR成像检查。转移灶及全肝的HPI均由感兴趣区(ROI)获取,并以像素对像素的方式定量计算钆喷酸葡胺(Gd—DTPA)的浓度改变。治疗前HPI测量误差用Bland—Ahman法分析,在应用抗血管生成药物BIBF1120治疗前后中位HPI的比较应用Wilcoxon秩和检验。治疗前, | K. Miyazaki D.J. Collins S. Walker-Samuel J.N. Taylor A.R. Padhani M.O. Leach 赵艳萍(译) 刘文亚(校) 唐光健(校) | 2008 | 国际医学放射学杂志2008,31,5: | 4 |
| 16 | 马克思与恩格斯对科学史和技术史的贡献显示文摘 马克思对怎样认识自然科学的主要贡献在于他强调自然科学的社会特征.马克思借鉴了黑格尔把事实看成发展过程中的因素,进而把历史事实理解为历史过程中的因素,并认为科学只有放在历史发展过程中考察才能正确理解.同样,技术也应以历史的观点来考察,但它的基本社会效能却显而易见.①…… | D.J.斯特洛伊克 徐义保 | 2006 | 科学文化评论2006,3,6: | 4 |
| 17 | INVESTIGATION OF SURFACE MORPHOLOGY, STRUCTURE AND ELECTROCATALYTIC PROPERTIES FOR O_2 EVOLUTION OF TITANIUM BASED IrO_2+Ta_2O_5 COATINGS显示文摘Titanium based IrO2 +Ta2O5 oxide anodes with different compositions and pyrolysis temperatures were prepared by termodecompoisition method. By using X-ray diffraction (XRD), the structure and texture coefficient of the coatings, TC(hkl), of IrO2 rutile crystal have been tested. It showed that, the crystallization processes of IrO2 and Ta2O5 in xIrO2 +(100-x) Ta2 O5 (x is in mol%) films affected and confined each other.In the mixed system, IrO2 rutile phase existed as a solid solution with Ta, and attained the maximum solubility when x=70mol%, i.e. for the coating of 70% IrO2 +Ta2O5.For the coatings of low iridium content or at low preparing tem pemture, (110) and (101) pwtered orientations were dominant. However, preferred growth of IrO2 weakened with increasing either iridium content or temperature. Three typical surface morphologies were observed by using scanning electron tnicroscopy(SEM). The crystallite size of the mixed oxide coatings were finest for the the film of 70%IrO2 +30%Ta2O5,and decreased with the pyrolysis tempemture. As the results of the finest crystallite segregating on sudece and the maxitnum solid solubility of Ir and Ta component in deposits, the coatings with the composition of 70%IrO2 +Ta2O5 prepared at 450℃ presented the mdrimutn electrocatalgtic activitg for O2 evolution in 0. 5M H2SO4 solution.UP to 550℃, Ti base suffered to oxidation resulting in decreasing anode conductivity,therefore, coatings performed a low activity. | J.M Hu J.X. Wu H.M Meng YR. Zhu D.B. Sun and D.J. Yang(Beijing Corrosion and Protection Center, Open Laboratory of Corrosion, Erosion and Surface Technology,University of Science and Technology Beijing, Beijing 100083, China) | 2000 | Acta Metallurgica Sinica(English Letters)2000,13,3: | 3 |
| 18 | Renormalization group analysis of the small-world network model显示文摘 | M.E.J. Newman D.J. Watts | 1999 | Physics Letters A1999,,4: | 3 |
| 19 | Search for the dark photon in π 0 decays显示文摘 | J.R. Batley G. Kalmus C. Lazzeroni D.J. Munday M.W. Slater S.A. Wotton | 2015 | Physics Letters B2015,,: | 3 |
| 20 | 中国某些铁陨石的化学分类显示文摘Based on structural observations and the concentrations of Cr, Co, Ni, Cu, Ga, Ge,As, Sb, Re, Ir and Au by neutron-activation analysis we have classified 14 Chinese iron meteorites. Thirteen are members of the large groups IAB, IIICD, IIICD,IIIAB and IVA.Leshan is an ungrouped iron meteorite that falls within the IIE field on some elementNi diagrams, but is distinctly outside this .fiel on plots of Cu, W, and Ir vs. Ni; it is very similar in Composition to Techado,another ungrouped iron. The high Cu content of Leshan is consistent with other evidence indicating that Cu is a valuable parameter for classifying, iron meteorites. IIICD Dongling appears not to be a new meteorite, but to be paired with Nantan; Dongling was recovered about 50 km from the location of the Nantan shower. Yungning is highly oxidized; we assign it to group LAB but cannot rule out IIICD. IVA-An Longchang has many characteristics of IVA irons, but has been remelted, prebably in a terrestrial setting, Five irons belong to group IVA, a remarkably large number. Three are identical in Composition, and we suspect that the two from Hubei, Guanghua and Huangling, are paired. Thus this set of 14 irons ineludes 12 independent fall. | 王道德 D.J.麦尔文 J.T.沃森 | 1983 | 地球化学1983,12,2: | 3 |