关于晶体中螺位错的弱束衍衬像

采用运动学衍衬理论,对晶体中螺位错引起的弱束衍衬像强度峰高度、位置随晶体试样厚度t,偏离参数S,位错线所在试样内部深度y的变化关系进行了计算。考虑到弱束时S比较大及S与位错柏氏矢量b之间的夹角,计算时对经典的运动学理论做了修正。     

Mechanochemical Synthesis of Visible-light Induced Photocatalyst with Nitrogen and Carbon Doping

Nitrogen and/or carbon doped titania photocatalysts were prepared by a novel mechanochemical method. The prepared powders possessed two absorption edges around 400 and 540 nm wavelengths and showed excellent photocatalytic ability for nitrogen monoxide oxidation under visible light irradiation. Under the irradiation of visible light of wavelength >510 nm, 37% of nitrogen monoxide could be continuously removed by the carbon and nitrogen co-doped titania prepared by planetary ball milling of P-25 titania-10% hexamethylenetetramine mixture followed by calcination in air at 400?C.     

Application of the Solvothermal Process in the Synthesis of High-performance Ag/g-Al2O3 Catalysts

Ag/g-Al2O3 is a kind of promising catalyst with the relatively lower cost compared with those using noble metals, good resistance against catalytic poisoning and excellent behaviour for NOx removal. In the present study, Ag/g-Al2O3 catalysts were synthesized by the solvothermal process and characterized by XRD, TG-DTA, TEM, UV-Vis and FT-IR. It was found that high-performance Ag/g-Al2O3 catalysts could be synthesized by properly selecting starting materials, controlling the composition of solvent and other reaction conditions. The microstructure evolution of the catalysts was also discussed.     

那一抹太平“蓝”

<正>一个人,一群老弱妇孺,一项起初并不被看好的工艺复兴计划—他们的作品何以在一场当代的展览上大放异彩?叶晋玉可能最懂得其中奥妙。2017年3月,作为亚洲最有影响的新加坡国际家具展(IFFS)开幕。在众多风格各异的前卫设计当中,"太平蓝"带来的丝巾、挂帘、淑女帽、桐花水纹包……这一件件由农村妇     

采用工程量清单招标应注意的几个问题

简要介绍《建设工程工程量清单计价规范》的实施概况,着重论述工程量清单计价与传统定额计价的区别及工程量清单招标的优点,指出工程量清单在编制招标文件中的优势和运用中应注意的问题。     

原子吸收法测定马齿苋中八种矿物元素

研究了硝酸、高氯酸混合酸湿法消解马齿苋样品，用空气-乙炔火焰原子吸收光谱法测定马齿苋中K，Ca，Mg，Fe，Zn，Cu，Mn，Pb八种元素的含量，对样品前处理方法，酸度，共存元素干扰，元素线性范围进行了实验。该方法的相对标准偏差为0.34％～3.78％（n=5），加标回收率为95．5％～101．9％，符合分析测试要求，采用FAAS法与ICP-AES法比较测定．其结果基本吻合，验证了方法准确可靠。为测定马齿苋中矿物元素含量提供了一种可行方法，为研究马齿苋的营养价值和药用价值提供了科学依据。     

Al-TiO2-C体系热力学分析及Al2O3-TiC复相陶瓷的燃烧合成

对Al-TiO2-C燃烧合成体系进行了热力学计算,并利用Al-O-N、Ti-O-N、C-O-N三个体系的叠加优势区相图分析了该燃烧合成体系的平衡产物相.结果表明,Al-TiO2-C燃烧合成体系的绝热燃烧温度为2398 K,燃烧合成平衡相为Al2O3和TiC.XRD检测结果与热力学分析结果相吻合,说明该燃烧合成反应进行得较为彻底,证实热力学分析结果可信.原位生成的Al2O3和TiC两相分布较均匀,燃烧合成产物疏松多孔,易于通过球磨方式达到破碎、磨细的目的.     

优势区相图在A l-T i O2-C-ZrO2燃烧合成体系热力学分析中的应用

以TiO2, Al, C和ZrO2为原料, 燃烧合成制备Al2O3-TiC-ZrO2纳米复相陶瓷是一种方法简单、节时省能的新工艺. 对Al-TiO2-C-ZrO2体系进行了热力学分析,计算出该体系的绝热燃烧温度, 并利用Al-O-N,Ti-O-N,Zr-O-N,C-O-N四个体系的叠加优势区相图, 分析了各相间反应进行的趋势和最终稳定存在的平衡相. 热力学分析表明:绝热燃烧温度为2327 K, 燃烧合成产物包括Al2O3,TiC,ZrO2三相. XRD检测未发现其它杂相, 证实热力学分析结果可信.