材料期刊网

中孔TUD负载的氧化铬掺杂氧化钛光催化降解苯酚

Yee Khai Ooi , Leny Yuliati , Siew Ling Lee

催化学报 doi:10.1016/S1872-2067(16)62492-0

中孔的TUD-1负载的氧化铬掺杂TiO2(Cr-TiO2)有望用于紫外光照射下光催化降解苯酚的催化剂.低角X射线衍射和红外结果证实该样品中TUD-1存在无定形和中孔硅酸盐框架. TUD-1的中孔结构进一步得到N2吸附-脱附的证实：为IV型等温线，并具有窄的孔径分布(3.9 nm)和高的比表面积(>490 m2/g).透射电镜结果表明，所制样品保持了纳米颗粒和多孔孔道结构. TUD-1中负载Cr-TiO2后使得带隙能量增加.与未负载的Cr-TiO2相比，所有TUD-1负载的Cr-TiO2光催化剂表现出更高的紫外光下降解苯酚的活性.其中Si/Ti摩尔比为30的Cr-TiO2/TUD-1样品的光催化活性最高(82%).苯酚的光催化降解遵循一级Langmuir吸附等温线.

关键词: 苯酚 , TUD-1 , 二氧化钛 , 光催化剂 , 中孔

混合制冷剂相互作用系数的研究-Lee-Kesler-Pl(o)cker通用状态方程

吴献忠 , 李美玲

工程热物理学报

混合制冷剂的相互作用系数是制冷空调应用中建模和计算制冷剂热力性质所需的一个重要参数,本文利用大量的汽液相平衡实验数据结合LKP方程进行了热力学关联,提出了适合于计算HFCs混合制冷剂的相互作用系数的一种算法,求取的相互作用系数用于汽液相平衡和循环分析计算具有较高精度,与实验数据或其他热力模型计算结果吻合情况良好.

关键词: 混合制冷剂 , 相互作用系数 , LKP方程

TRACKING OBSERVATION ON SUBSURFACE CRACK IN BEARING STEEL GCr15 UNDER ROLLING CONTACT

CHEN Longqing Zhengzhou Institute of Technology , Zhengzhou , China CHEN Qing Luoyang Institute of Technology , Luoyang , China

金属学报(英文版)

Based on the sequent tracking observation on spalling of steel GCr15 under rolling contact fa- tigue,an expression for estimating the propagation of subsurface cracks was derived.The rol- ling contact fatigue life was found to be markedly related to the subsurface crack propagation angle.A new explanation of reason why the rolling contact fatigue life can be prolonged by residual compressive stress and retained austenite was advanced.

关键词: contact fatigue , null , null , null , null

Influence of Rolling Reductions on Recrystallization Texture in Commercially Pure Al

MAO Weimin University of Science and Technology , Beijing , 100083 , China.

材料科学技术（英文）

The recrystallization texture in commercially pure Al is investigated after the samples are rolled differently and annealed.The samples with low rol- ling reductions could be generally recovered or recrystallized in situ and characterized by the re- tained G{110}<001>component.This recovery process decreases during annealing with the increase of reduction.The appearance of the B/R{359}. <132>and R{123}<634>components de- pending on the rolling reduction is investigated and the less developed Cube{100}<001>component in commercially pure ahninium is also discussed.

关键词: recrystallization , null , null , null

锥形量热仪法研究抑烟填料对膨胀型防火涂料烟毒性能的影响

关迎东 , 李少香

涂料工业 doi:10.3969/j.issn.0253-4312.2010.12.001

利用锥形量热仪(CONE)实验获得的生烟速率(SPR)、生烟总量(TSP)以及CO生成速率(Pco)等参数,对抑烟填料硼酸锌(ZB)、阻燃抑烟剂(LEE)以及可膨胀石墨(EG)复配防火涂料的烟毒释放进行了对比研究.结果表明:抑烟填料硼酸锌(ZB)、阻燃抑烟剂(LEE)的加入明显降低了材料燃烧时的烟毒释放;物理膨胀填料EG与ZB、LEE体系复配能达到更好的阻燃抑烟协效作用,使烟毒参数进一步降低.

关键词: 抑烟填料 , 防火涂料 , 锥形量热仪 , 烟毒性

Intergrain interaction, coercivity and Henkel plot for NdFeB magnets

Ruwei GAO , Wei CHEN , Jiancheng ZHANG , Weicun FONG , Wei LI , Xiumei LI

材料科学技术（英文）

For both sintered and nanocomposite NdFeB magnets, deltaM(H) of the Henkel plot increases from zero, and reaches a peak, then decreases and changes to the negative values with increasing applied field. This shows that the intergrain interaction changes from the exchange-coup ling type into the magnetostatic interaction type. The magnetic field corresponding to the peak of deltaM(H) is slightly smaller than the coercivity of magnet. The peak of deltaM(H) for aligned sintered magnet is greater than that for misaligned magnet. deltaM(H) peak of the nanocomposite NdFeB magnets increases with decreasing grain sizes. It indicates that the effect of alignment field on the properties of magnet is similar to that of exchange-coupling interaction.

关键词:

INFLUENCE OF SURFACE HARDENING ON CONTACT FATIGUE LIFE OF NODULAR CAST IRON

TAO Zengyi LUO Jiaming Huazhong University of Science and Technology , Wuhan , China TAO Zengyi , Faculty of Metallic Materials , Dept.of Mechanical Engineering No.2 , Huazhong University of Science and Technology , Wuhan 430074 , China

金属学报(英文版)

The influence of laser surface melting and induction hardening on the surface structure,con- tact fatigue life and failure behaviour of the nodular cast iron has been investigated.The con- tact fatigue life can be improved by both laser treatment and induction hardening,but the fail- ure process and type are different from each other.The former is due to lumpy and deep spal- ling caused by crack propagation between the quenching zone and the substrate,and the latter is due to nubby and surface flaking caused by the oil wedged action into surface cracks.

关键词: surface hardening , null , null , null

EFFECTS OF THE PARABOLIC POTENTIAL AND CONFINED PHONONS ON THE POLARON IN A QUANTUM WIRE

Physical Review B

By using the Lee, Low, and Pines variational method, we have studied the electron-confined phonon, interaction within a rectangular quantum wire under an additional parabolic potential. Formulas for the polaron self-energy, the electron effective mass along the wire, and the ground-state energy are derived. Numerical calculations are performed for a typical GaAs quantum wire within the mesoscopic size using the idea of Fourier decomposition of the wave function. In comparison with previous calculations, our results show that the effect of phonon confinement always reduces the magnitude of the electron-phonon interaction and the associated physical quantities, whereas the additional parabolic potential tends to enhance not only this interaction but also the ground-state energy.

关键词: electron-gas;well;localization

基于边缘保持的SAR图像滤波算法研究

高珊 , 马艳会

液晶与显示 doi:10.3788/YJYXS20132802.0290

为了有效去除SAR图像中的相干斑噪声,同时很好地保留图像中的边缘细节,将双边滤波算法应用到SAR图像滤波,并使用ENL和EPI对其参数进行估计；经过参数估计的双边滤波算法作用于SAR图像后,很好地去除了斑点噪声且保留了边缘信息；实验结果表明,该算法的主观和客观数据都优于经典Lee滤波算法.

关键词: 相干斑去噪 , 双边滤波 , 边缘保持 , ENL , EPI

多轴疲劳破坏准则现状及评估

王英玉 , 姚卫星

材料工程 doi:10.3969/j.issn.1001-4381.2003.z1.009

简要回顾了材料多轴疲劳破坏准则,引用了5种材料在单轴、比例、纯扭和90°非比例加载情况的疲劳试验结果,对基于应力、应变和能量的有关多轴疲劳破坏准则进行了分析评估.分析结果表明:应力准则中Lee准则在各种材料、各种载荷情况下均可得到误差在5%以内的较好的预测结果,但是,Lee准则中含有物理意义不明确的材料常数,需要一定量的试验数据来拟合,从而限制了该准则的应用,比例加载下,Gough准则计算简单并可适用于大部分材料;应变准则中Kandil,Brown和Miller准则和Borodii和Strizhalo准则在各种材料及各种载荷情况下都能较好的预测疲劳寿命,但Borodii和Strizhalo准则需要大量的试验数据支持,从而限制了它的应用.

关键词: 多轴疲劳破坏准则 , 比例加载 , 非比例加载 , 评估