TiO2纳米线的制备与退火处理

文章利用水热法成功制备二氧化钛纳米线,对制作样品进行不同温度的退火处理,利用X射线衍射仪（XRD）分析表征二氧化钛纳米线的成份与晶型,采用扫描电子显微镜（SEM）对TiO2纳米线的形貌进行了分析表征。     

单模微波水热控制合成纳米硫化铜

以硝酸铜,生物小分子L-半胱氨酸为原料,在室温下生成前驱体,然后采用单模微波水热法在150℃下反应1h,制备出纳米硫化铜,考察了硝酸铜与L-半胱氨酸的物质的量比对产物形貌的影响。采用XRD和TEM对产物的结构和形貌进行了表征。结果表明,当二者物质的量的比为1：1时反应得到的纳米晶硫化铜为球形,其粒径均匀。     

铜纳米线结构与能量分布随温度变化特征的计算机模拟

采用分子动力学方法对不同体系的铜纳米线在不同温度下的结构与能量分布特征进行了计算机模拟。得到铜纳米线随温度变化时在不同方向的结构变化和能量分布图,并对其进行了分析和讨论.     

Quality of effluents from Hattar Industrial Estate

Of 6634 registered industries in Pakistan, 1228 are considered to be highly polluting. The major industries include textile, pharmaceutical, chemicals （organic and inorganic）, food industries, ceramics, steel, oil mills and leather tanning which spread all over four provinces, with the larger number located in Sindh and Punjab, with smaller number in North Western Frontier Province （NWFP） and Baluchistan. Hattar Industrial Estate extending over 700 acres located in Haripur district of NWFP is a new industrial estate, which has been developed with proper planning for management of industrial effluents. The major industries located in Hattar are ghee industry, chemical （sulfuric acid, synthetic fiber） industry, textile industry and pharmaceuticals industry. These industries, although developed with proper planning are discharging their effluents in the nearby natural drains and ulti- mately collected in a big drain near Wah. The farmers in the vicinity are using these effluents for growing vegetables and cereal crops due to shortage of water. In view of this discussion, there is a dire need to determine if these effluents are hazardous for soil and plant growth. So, effluents from different industries, sewage and normal tap water samples were collected and analysed for pH electrical conductivity （EC）, total soluble salts （TSS）, biological oxygen demand （BOD）, chemical oxygen demand （COD）, total nitrogen, cations and anions and heavy metals. The effluents ofghee and textile industries are highly alkaline. EC and TSS loads of ghee and textile industries are also above the National Environmental Quality Standards （NEQS）, Pakistan. All the effluents had residual sodium carbonates （RSCs）, carbonates and bicarbonates in amounts that cannot be used for irrigation. Total toxic metals load in all the effluents is also above the limit i.e. 2,0 mg/L. Copper in effluents of textile and sewage, manganese in ghee industry effluents and iron contents in all the effluents were higher than NEQS. BOD and COD values of all the industries are also above the NEQS. On the whole, these effluents cannot be used for irrigation without proper treatment otherwise that may cause toxicity to soil, plants and animals as well add to the problems of salinity and sododicity. Similarly, these effluents cannot be used for fish farming.     

基于SPR的铜纳米线/金属膜复合结构的研究

分别采用LPR-SC-MS/TE法制备一种亚波长结构金属薄膜:铜纳米线/金属膜复合结构。在这种复合结构中,铜纳米线平行镶嵌于金属膜中。利用光学显微镜和紫外分光光度计分别对复合结构膜的形貌及光学吸收特性进行研究发现:采用LPR-SC-MS/TE法制备的铜纳米线/金属复合结构膜中仅同质的铜纳米线/铜膜复合结构在656 nm波长处出现一个明显的SPR共振吸收峰,而异质的复合结构在可见光范围内未出现SPR共振吸收峰。     

稳态法测量热导率实验分析

应用稳态法分别测量热的不良导体（橡胶）和热的良导体（铜棒）的热导率,发现用稳态法测量热导率,在稳定传热条件下,增大被测量材料两端温差到20℃左右,热的良导体和热的不良导体材料的热导率的测量精度都会提高;在同样的实验环境中,稳态法测定热的不良导体的热导率比其测定热的良导体热导率实验精度高。     

关于CuS在浓盐酸中溶解性的分析与讨论

以硫化钠为原料制备硫化铜,试验其在不同浓盐酸中的溶解性,并对实验现象和所得结论做出合理的解释。     

Copper vanadate minerals found in mediaeval mural paintings

Abstract

A yellowish copper vanadate mineral has been found in Swedish mural paintings from the fifteenth century. Small patches occur in malachite-green paint. Thirteen samples from five churches have been analyzed by optical and scanning electron microscopy with energy–dispersive X-ray spectrometry, transmission electron microscopy, X-ray powder diffraction, and polarized light microscopy. The substance is evidently the rather uncommon mineral volborthite, with the chemical formula Cu₃V₂O₇(OH)₂.2H₂O. Very small quantities have also been noted for another mineral, presumably calcio-volborthite, CaCu(VO₄)(OH), also named tangeite. The results show that the conservator should always be observant for pigments not earlier noticed or reported. There are some old mines in Central Europe, e.g. in Germany, which contain malachite as well as copper vanadate minerals, and this is probably the origin of the yellow patches in the paintings.     

青海省干热各沟地区铜金多金属矿找矿地质条件及成矿远景

本文研究区大地构造位置位于东昆仑南缝合带北侧,布喀达坂峰-阿尼玛卿山华力西期铜、钴、金(锑)、煤、蛇纹岩Ⅲ级成矿带上,属秦祁昆地层区的东昆仑南坡分区。研究区出露的地层总体北部广布第四系,南西部分布古近系古新统—始新统沱沱河组地层,中西部以二叠系上统布青山群马尔争组为主;受昆南深大断裂的影响,区域内褶皱构造和断裂构造发育,构造以北西西向断裂为主;岩浆岩主要为华力西期晚期基性-超基性、中酸性侵入岩多分布于研究区中东部,多呈岩株、岩基、岩脉状产出。研究区内圈定MCu1—MCu6六条铜矿化带,MAu1、MAu2两条金矿化带,其中MCu2、MCu3铜矿化带和MAu1、MAu2金矿化带规模及品位较好。通过对已有地质信息与典型矿床对比分析成矿条件,确定找矿类型、找矿方向和找矿远景。     

基于STM32的手写绘图板的设计与实现

本文提出了由微控制器STM32为主控制核心,利用普通的PCB覆铜板设计和制作低功耗手写绘图输入设备,通过表笔与覆铜板接触进行电压信号采集,然后将采集到的信号经高精度仪表放大器AD620放大调理后再通过24位高精度AD转换器ADS1256转换为单片机能够处理的数字信号,最后在LCD屏上显示对应接触点的坐标位置。