Bin Yu
材料科学技术（英文）
Color stability of dental resin modified glass ionomer (RMGI) has been a challenge to dentistry; therefore, systematic changes in 2-hydroxyethyl methacrylate (HEMA) content were performed experimentally to find an idea to enhance the color stability. Changes in color ( ΔEab*) and color coordinates (ΔL*, Δa* and Δb*) of experimental 10-50 wt pct HEMA-added dental glass ionomers (HAGIs) and corresponding RMGIs were determined after 5000 cycles of thermocycling. Color changes of HAGIs were not influenced by the HEMA content while ΔL*, Δa* and Δb values were in°uenced by the HEMA content. Color stability of 30% or 40% HEMA-added HAGIs was not different from those of the commercial RMGIs. Since the in°uence of HEMA itself on the color stability of HAGIs was limited, compositional modi¯cation to increase the color stability of these materials should be developed.
关键词:
Glass ionomer
,
HEMA
,
color coordinate
,
thermocycling
Bin Yu
材料科学技术（英文）
Color stability of dental resin modified glass ionomer (RMGI) has been a challenge to dentistry; therefore, systematic changes in 2-hydroxyethyl methacrylate (HEMA) content were performed experimentally to find an idea to enhance the color stability. Changes in color ( ΔEab*) and color coordinates (ΔL*, Δa* and Δb*) of experimental 10-50 wt pct HEMA-added dental glass ionomers (HAGIs) and corresponding RMGIs were determined after 5000 cycles of thermocycling. Color changes of HAGIs were not influenced by the HEMA content while ΔL*, Δa* and Δb values were in°uenced by the HEMA content. Color stability of 30% or 40% HEMA-added HAGIs was not different from those of the commercial RMGIs. Since the in°uence of HEMA itself on the color stability of HAGIs was limited, compositional modi¯cation to increase the color stability of these materials should be developed.
关键词:
Glass ionomer
,
HEMA
,
color coordinate
,
thermocycling
中国腐蚀与防护学报
N。1Atmospheric Corrosivlty for Steels………………………………………………… .LIANG Caideng HO[I i。-tat（6）Caustic Stress Corrosion Cr。king of Alloy 800 Part 2.The Effect of Thiosul执e……………………………………… KONG De-sheng YANG Wu ZHAO Guo-zheng HUANG De.ltL。ZHANG Yu。。he CHEN She。g-bac（13）SERS slid E16CttOCh6iniC81 Stlldy Of Illhibit1Oli M6ch＆tllsth Of ThlollY68 Oil ITOll ID H....
关键词:
赵洁
,
姚秉华
,
冯逸晨
功能材料
采用共沉淀法制备BiNbO4纳米棒。利用X射线粉末衍射仪（XRD）、透射电镜（TEM）、紫外-可见漫反射光谱（UV-Vis DRS）和热重分析（TG/DTA）对其结构、形貌和性质进行表征,并通过紫外-可见分光光度计分析BiNbO4纳米棒光降解罗丹明B来研究其光催化活性。结果表明以五氧化二铌和五水硝酸铋为原料制备得到正交相结构的BiNbO4纳米棒;BiN-bO4纳米棒具有较高的光催化活性,在紫外光下,pH值=3.05,催化剂用量为2g/L时能够有效地降解罗丹明B,降解率受到光源、催化剂浓度和溶液pH值的影响较大。
关键词:
共沉淀法
,
BiNbO4纳米棒
,
光催化
杨飒
,
郑志硕
量子电子学报
doi:10.3969/j.issn.1007-5461.2015.03.005
针对尺度不变特征变换(Scale-invariant feature transform,SIFT)算法在关键点特征描述向量阶段计算复杂并且维数较高的现象,提出了一种基于压缩感知理论的SIFT算法.通过压缩感知理论的稀疏特征表示方法,对SIFT关键点特征向量进行提取,将高维梯度导数向量降到低维稀疏特征向量,降低了关键点描述向量维度.采用欧式距离作为关键点的相似性度量, Best-Bin-First(BBF)数据结构避免穷举,使数据的运算量大为减少.实验结果表明,新算法对存在仿射变换的医学图像配准性能优于传统SIFT算法,与当前改进型的SIFT算法相比,本文算法的实时性明显增强.
关键词:
图像处理
,
图像配准
,
尺度不变特征变换
,
特征提取
,
稀疏随机投影
李伟国
,
祁超
,
刘立岩
,
赵大庆
应用化学
doi:10.3969/j.issn.1000-0518.2005.11.003
分别研究了二乙三胺五乙酸(DTPA)及2种衍生物二乙三胺五乙酸-双二甲酰胺(DTPA-BDMA)和二乙三胺五乙酸-双(异烟肼)(DTPA-BIN)对乳酸脱氢酶活性及酶促反应动力学的影响.结果表明,它们均可以抑制脱氢酶的活性,其抑制类型为竞争性的抑制作用,抑制常数分别为3.37、7.41、8.52μmol/L.紫外差谱结果表明,DTPA及其衍生物可以和酶分子作用,其羧基部分被包埋到分子内部,在酶分子的结合部位存在芳香族的氨基酸残基.DTPA与脱氢酶作用后使酶分子中的色氨酸荧光强度减弱,对酪氨酸的荧光没有明显影响.
关键词:
二乙三胺五乙酸
,
乳酸脱氢酶
,
酶学动力学
,
紫外差谱
,
荧光光谱
王浩
,
刘国权
,
秦湘阁
金属学报
采用Potts模型Monte Carlo方法对3种现存的三维个体晶粒长大速率拓扑依赖性
方程进行了仿真验证. 结果表明, Rivier速率方程认为晶粒
体积变化率dVf/dt与晶粒面数f成线性关系, 与仿真
结果明显不符, 不适用于描述三维晶粒长大过程的动力
学. 当晶粒面数f≥8时, Yu-Liu速率方程和
MacPherson-Srolovitz速率方程均与仿真结果很好吻合,
表明这两者均可以用来定量描述三维晶粒长大过程的动力学；当
f＜8时, 这两个方程均与仿真结果有显著差异.
关键词:
三维晶粒长大
,
topology-dependent grain growth rate equation
