Experimental Research Exploring the Efficacy of Using Spectral Analysis for Dating Persian Ceramics,with a Blue Glaze or Presenting Blue Motifs

This paper presents experimental research on the contribution made by spectral analysis to the identification and dating of Persian ceramics with a blue glaze or blue motifs. Since we know that the characteristic blue colour of these ceramics can vary according to their composition and traditions of manufacture that are specific to the different centuries in which they were created, it would be interesting to determine whether a non-destructive and non-invasive method of analysis would be possible to date the ceramic without altering the object itself. To do this, 72 ceramics from the Royal Ontario Museum of Toronto, as well as 2 other dishes (a Qajar dish from the nineteenth century and a dish from the twentieth century) were photographed and readings of the blue colour present on the objects were processed using the ImageJ software. Colour values obtained were then plotted on a graph and sorted by century for analysis. This study shows that it is possible to date Persian ceramics using a photograph, a spectrometer, and calibrating software, to establish the century in which a Persian ceramic with blue glaze or blue motif was made.     

数控玻璃加工机床横梁有限元分析及优化设计

横梁是数控玻璃加工机床关键零部件,利用ANSYS软件对其进行静、动态特性分析以及谐响应分析,获得了横梁极端工况的变形情况以及前六阶固有频率和振型,确认第2阶固有频率易引起横梁共振。以提高二阶固有频率为优化设计目标,横梁结构尺寸为优化变量,运用Isight软件及灵敏度分析方法对其进行优化。结果表明:优化后横梁质量减少了12.88kg,静变形量减少29.22kg,二阶固有频率增大13.34Hz。     

SrRuO_3是否为自旋玻璃(英文)

测量了烧结SrRuO3 的零场冷却 (ZFC)和加场冷却 (FC)的直流磁化强度和交流磁化率 .交流磁化率 -温度曲线的峰随外加直流偏场的增加向低温方向移动 .继续增加直流偏场 ,一个峰分裂成两个峰 ,其中低温下的一个峰继续向低温方向移动 ,另一个高温处的峰却向高温方向移动 .在不同频率下测量零偏场下的交流磁化率 .随频率的增加 ,峰值减小 ;但峰的位置并没有像以前报道的那样向高温方向移动 .可见 ,烧结SrRuO3 并没有显示自旋玻璃行为 .     

聚甘氨酸修饰电极方波伏安法测定人体尿酸

利用方波伏安法研究了尿酸在聚甘氨酸修饰玻碳电极上的电化学氧化行为.结果表明:在0.01 mol/L磷酸盐缓冲液(pH=7)中,尿酸在+0.31 mv左右产生一个氧化峰,峰电流与尿酸在1.0×10-6—1.0×10-5mol/L浓度范围呈较好的线性关系,相关系数为0.9945.该方法可用于直接测定人体尿酸,回收率为95.5%-104.1%,相对标准偏差为1.4%.     

Polycrystalline ZnSxSe1-x thin films deposited on ITO glass by MBE

MBE growth of ZnSxSe1-x thin films on ITO coated glass substrates were carried out using ZnS and Se sources with the substrate temperature ranging from 270℃ to 330℃. The XRD θ/2θ spectra resulted from these films indicated that the as-grown polycrystalline ZnSxSe1-x thin films had a preferred orientation along the (111) planes. The evaluated crystal sizes as deduced from the FWHM of the XRD layer peaks showed strong growth temperature dependence, with the optimized temperature being about 290℃. Both AFM and TEM measurements of these thin films also indicated a similar growth temperature dependence. High quality ZnSxSe1-x thin film grown at the optimized temperature had the smoothest surface with lowest RMS value of 1.2 nm and TEM cross-sectional micrograph showing a well defined columnar structure.     

提高轿车风挡玻璃丝网印刷网版制作质量的方法

分析影响轿车风挡玻璃丝网印刷网版制作质量的因素，结合生产实际，采用带有顸应力的丝网印刷专用铝合金网框、优质聚酯丝网、先进的绷网方法、湿．湿感光胶涂布法、显影冲洗法、网版修整加固法，可以来制作高质量的印刷轿车风挡玻璃用丝印网版．     

Zr52.5Al10Ni10Cu15Be12.5 大块金属玻璃的高温宏观硬度

The hot hardness behavior of Zr52.5Al10Ni10Cu15Be12.5 bulk metallic glass is studied from ambient temperature to the temperature over Tx （the onset crystallization temperature） using a hot macro-hardness tester and scanning electron microscopy （SEM）. The results show that the hot hardness behavior of Zr52.5Al10Ni10Cu15Be12.5 bulk metallic glass can be classified into 4 zones： the glassy zone in which the hardness almost linearly decreases with the increase of temperature, the viscoelastic zone in which the hardness is nearly unchanged, the viscous flow zone in which the hardness quickly tends towards near zero with temperature, and the crystallization zone in which the hardness sharply increases. The high temperature deformation behavior and the easy processable deformation region for bulk metallic glasses are also discussed on the basis of the hot marco-hardness.     

专用玻璃量器测量不确定度的评估

文章对专用玻璃量器测量的不确定度进行评估,分析了测量过程中存在的不确定度来源,并建立了测量模型,量化不确定度分量,求出合成不确定度和扩展不确定度。     

Relationship of glass forming ability and local structural properties of liquid Cu-Zr alloys

Molecular dynamics (MD) simulations were performed to investigate the glass forming ability (GFA) and microscopic structural properties of liquid Cu-Zr alloys. Based on the analysis of composition dependences of the reduced glass transition temperatures and the excess volume, we found that the Cu-Zr glasses have the largest GFA at Cu65Zr35 composition. To get more detailed information of local structure, we calculated the pair correlation functions, partial pair correlation functions, the excess entropy, chemical order parameter, coordination number, and Voronoi index of Cu-Zr liquids. We found that there exists an obvious and close relationship among the GFA, the excess entropy calculated using the total pair correlation functions, chemical order parameters, and some Cu centered cluster with Voronoi index <0,2,8,1> and Zr centered cluster with Voronoi index <0,3,6,4>, which all have nonlinear dependences on Cu/Zr concentration and have extreme values at liquid Cu65Zr35 composition.     

Sensitized Up—Conversion Luminescence of Ho^3＋ in Nd^3＋—Yb^3＋—Ho^3＋ Co—doped ZrF4—Based Glass

Up-conversion processes for the blue, green and red emissions were found two-photon phenomenon, known as the cooperative phenomenon. This phenomenon was assisted by Nd³⁺ → Yb³⁺ → Ho³⁺ energy transfer. The strong green emission due to the Ho³⁺ : (⁵F₄, ⁵S₂)→ ⁵I₈ transitions was observed in Nd³⁺-Ho³⁺ co-doped ZrF₄-based fluoride glasses under 800 nm excitation. As an attempt to enhance Ho³⁺ up-conversion luminescences in the Nd³⁺ – Ho³⁺ co-doped ZrF₄-based glasses, Yb³⁺ ions were added to the glasses. As a result it was found that, in 800 nm excitation of 60 ZrF₄. 30BaF2. (8-x)LaF₃. lNdF₃. xYbF₃. 1HoF₃ glasses (x=0 to 7), sensitized up-conversion luminescences are observed at around 490 nm (blue), 545 nm (green), and 650 nm (red), which correspond to the Ho³⁺ : ⁵F₃ → ⁵I₈, ( ⁵F₄, ⁵S₂)→⁵I₈ and ⁵F₅→ ⁵I₈ transitions respectively. The intensities of the green and red emissions in a 3 mol % YbF₃-containing glass were about 50 times stronger than those glasses without YbF₃. This is based on sensitization due to Yb³⁺ ions. In particular, the green emission was extremely strong and the Nd³⁺-Yb³⁺-Ho³⁺ co-doped ZrF₄-based glasses have a high possibility of realizing a green up-conversion laser glass. In this paper the up-conversion mechanism in the glasses is discussed in detail.