Highly porous YSZ ceramic foams using hollow spheres with holes in their shell for high-performance thermal insulation

Yttria-stabilized zirconia (YSZ) porous ceramic foams were fabricated using YSZ microspheres with holes on the surface to determine their properties as insulation materials. Highly porous YSZ ceramics with bimodal pore structures, such as internal pores in single hollow spheres and external pores between the spheres, were successfully prepared using YSZ spheres as raw materials. Additionally, holes were added to the shells to reduce continuous thermal pathways and significantly enhance the insulation properties. Furthermore, by adding holes on the surface of the sphere, the porous foams using a hollow sphere exhibit a maximized porosity of 80.69%, remarkably enhanced their insulation properties with low thermal conductivity (0.10 W/m-K), and have sufficient compressive strength to protect the green body (5.7 MPa). The mechanical strength of the YSZ porous foam was maintained owing to the uniform arrangement of the supports.     

基于代谢组学研究不同花色种类云南白茶的化学成分差异

以云白毫、白牡丹（包括月光白一级和月光白二级）、云寿为云南白茶的代表性样品,采用基于超高效液相色谱-四极杆轨道阱质谱的代谢组学方法对不同花色种类云南白茶的化学成分差异进行研究。共鉴定出120 个化合物,包括儿茶素类、二聚儿茶素类、氨基酸类、生物碱类、酚酸类、有机酸类、香气糖苷类、N-乙基-2-吡咯烷酮取代的儿茶素类、黄酮糖苷类、脂质类等。偏最小二乘法判别分析和热图分析分别表明不同花色种类云南白茶的化学成分存在较大差异,共得到76 个化合物具有组间显著性差异（P＜0.05）,其中儿茶素类、二聚儿茶素类、生物碱类、酚酸类、茶氨酸等化合物随云南白茶原料嫩度的降低,含量下降;部分氨基酸和杨梅素苷在白牡丹中含量相对较高;芹菜素苷、山柰酚苷、槲皮素苷、脂质类化合物在云寿中含量相对较高。本研究可为云南白茶感官品质和营养价值的研究以及等级判别提供理论依据。     

安塞低渗油田水平多分支井钻井技术

针对安塞油田低渗透油藏地质特征,结合分支井开发方式的适应性及其技术特点,通过对分支井井身结构优化、钻头选型、轨迹控制、分支井眼侧钻、地质导向、摩阻扭矩分析等技术的研究和应用,成功完成了安塞油田第1口水平多分支井-杏平1井。该井完钻井深5068 m,水平位移1574.22 m,主水平段长1203 m,水垂深比1.16。在只能使用常规钻井设备及导向工具等难题下,成功采用低边侧钻技术在主水平段内侧钻了7个分支井眼,分支井眼总长2300m,累计打开目的储层3503 m,并实现了多次重入钻井,初步形成了适合安塞油田地质特点的分支井钻井技术。     

EDTA在化学镀铜中的应用

以EDTA为配体,CuSO4·5H2O为主盐,次磷酸钠为还原剂,对铸铁基体表面化学快速镀铜进行了研究,确定的镀液的组成为:7.5g/L CuSO4.5H2O,20 g/L EDTA,38 g/L次磷酸钠,37 g/L四硼酸钠,15g/L柠檬酸三钠,0.5g/L硫酸镍,0.2mg/L硫脲,0.05g/L脂肪醇聚氧乙烯醚(O-20)。最佳工艺条件θ为65℃,pH=8.3,t为40min。结果表明,在上述条件下铸铁基体表面形成的铜镀层光亮度良好,镀层均一,纯度高,显著提高了镀层质量。     

机电产品3D零件库开发模式及关键技术研究

现有3D零件库系统在实际应用中存在查询检索缓慢、调用繁琐、更新升级不便等问题.以机电产品中广泛应用的具有标准化、通用化特征的零件为对象,以其数据依功能的一致性归类关联记录存储为前提,探讨了以Pro/E系统为平台,综合运用三维CAD技术、XML技术和关系数据库技术,开发建立内容可动态扩充、定制的机电产品三维零件库的实现技术及所需解决的关键问题.该方法可以为不同领域产品3D零件库的开发提供一种通用的思路.     

输油泵振动原因分析与处理措施研究

输油泵是油田输油生产的关键设备之一,提高输油泵的运行效率具有极大的经济效益。而输油泵产生振动会给生产带来影响且有安全隐患,分析了输油泵产生振动的原因,并介绍了防止和消除振动的措施,为实际生产提供了指导。     

Bamboo-shaped SiC nanowire-toughened SiC coating for oxidation protection of C/C composites

An oxidation protective bamboo-shaped SiC nanowire-toughened SiC coating was prepared on the carbon/carbon composites by chemical vapor deposition and pack cementation. It is found that incorporating bamboo-shaped SiC nanowires makes the coating hardness and elastic modulus increase by 20.07% and 40.42% and microcrack density decrease by 84.04% due to their unusual toughening mechanism resulting from the nanoscale mechanical interlocking between the nodes and the surrounding matrix, resulting in a good oxidation inhibition for the coated samples. The result showed that the weight loss of the coated samples was only 0.5% after isothermal oxidation at 1500 °C for 72 h.     

地沟油脱色方法研究进展

介绍了地沟油的概念及危害,对活性炭、活性白土等吸附脱色方法及氧化脱色方法进行了综述,总结了这些方法的优缺点。     

CEMP勘探在鄂尔多斯西缘前陆盆地的应用效果

鄂尔多斯盆地西缘前陆盆地属典型的黄土塬地貌,地表黄土切割剧烈,地下地质构造复杂,地震勘探难度较大。利用电磁阵列剖面(CEMP)法,通过多项反演,认识该区的断裂特征、基底特征、盖层特征。结合其他物探资料,对该区的有利目标区作出预测。特别是对鄂尔多斯西缘前陆盆地逆冲断裂带结构的分析和推测,弥补了地震资料较差区和空白区在该区域认识上的不足。实践证明,利用CEMP法在黄土塬、复杂山区进行勘探,可以获得丰富可信的地质成果,为查明盆山接触关系、目的层构造形态及预测油气有利区提供重要的依据。     

5.1% Apparent quantum efficiency for stable hydrogen generation over eosin-sensitized CuO/TiO2 photocatalyst under visible light irradiation

A dye-sensitized CuO incorporated TiO₂ catalyst was found to be an active photocatalyst for the photocatalytic hydrogen production from water under visible light (> 420 nm) irradiation in the presence of electron donors such as triethanolamine, acetonitrile and triethylamine. The stronger adsorption of eosin Y on the CuO incorporated TiO₂ catalyst by multidentate complexation than on pure TiO₂ was proved by the method of spectrophotometry, namely, the addition of CuO strongly improved the adsorption capability of TiO₂ toward eosin dye and this effect led to a high quantum efficiency of eosin-sensitized CuO/TiO₂ for photocatalytic water splitting. The electrons excited from the sensitizer molecules which were strongly adsorbed both on TiO₂ and CuO by the visible light injected into the conduction band (CB) of both TiO₂ and CuO, the electrons in CB of TiO₂ subsequently transferred to CB of CuO, which resulted in a build-up of excess electrons in the conduction band of CuO. Consequently, the accumulation of excess electrons in CuO causes a negative shift in the Fermi level of CuO. As a result of that, the significant enhancement of apparent quantum yield (∼5.1%) and a good stability was obtained over the dye-sensitized 1.0 wt% CuO/TiO₂ photocatalyst.