光波导二氧化氮气敏传感元件的研究

本文用离子交换法制备K+交换玻璃光波导元件,并在其表面固定纳米级敏感层酞菁铜(CuPc)薄膜,利用光波导气体检测系统对NO2气体进行测试.结果表明,该传感元件常温下对NO2等气体有快速、可逆的响应,并具有重现性好,灵敏度高等特点.     

新疆入境旅游客源市场分析及开发策略

本文分析了新疆入境旅游客源市场的时间结构和区域结构(分析了独联体客源市场与游客地理集中指数的关系)及游客平均停留天数和消费结构,揭示了新疆入境旅游客源市场的现状,并提出了开拓新疆国际旅游客源市场的对策和措施。     

榅桲果实中生物碱粗提物的抑菌作用研究

经过定性实验确定榅桲中含生物碱,用分光光度法测定榅桲果实总生物碱含量为1.2%。又对榅桲果实生物碱粗提物对几种常见菌株进行体外抑菌实验。结果表明,榅桲果实生物碱粗提物对大肠杆菌、金黄色葡萄球菌、枯草芽孢杆菌有一定的抑制作用,但对黑曲霉、根霉、青霉和酵母菌的抑制效果不太明显。     

Photocurrent analysis of AgIn<Subscript>5</Subscript>S<Subscript>8</Subscript> crystal

The photocurrent (PC) spectrum of AgIn₅S₈ crystal consists of a single peak, which provides to determine the bandgap energy by applying the Moss rule. The temperature dependence of the bandgap energy was also calculated. The PC dramatically increased by pre-illumination with light having wavelength corresponding to the bandgap of AgIn₅S₈. The temperature-dependent PC of the sample was measured at different temperatures from 80 to 300 K and the PC spectrum consisted a single broad peak. Thermal quenching of the PC was observed to start at ～105 K and the PC completely quenched at ～180 K. The quenching mechanism was discussed in terms of the two-centre model. The height of the PC peak rised linearly with applied voltage up to 5.0 V under constant intensity of light. Similarly, the dark current–voltage characteristics consisted of a single region dominating an ohmic behaviour, and no space charge limited region was apparent at various temperatures up to 20 V.     

天山花楸果实多糖的提取工艺优化

为确定以花楸果实多糖的提取工艺,先用分光光度法测定超声提取的天山花楸不同部位多糖的含量,再设计正交试验筛选超声提取天山花楸果实多糖的最佳工艺条件。结果表明:天山花楸各部位中果实含糖量最高,为4.63%。最佳工艺条件为以95%乙醇溶液醇沉、料液比1:45(g/mL)、超声时间45min、超声功率240W,天山花楸果实中多糖含量可达到5.92%。其中,料液比是影响天山花楸多糖得率的显著性因素。     

EFFECT OF VITAMIN E SUPPLEMENTATION ON INTRA- AND INTERMUSCULAR FATTY ACID COMPOSITION OF AWASSI LAMBS

This research was carried out to determine the effects of vitamin E supplementation on inter- and intramuscular fatty acid composition in meat of Awassi lambs. Lambs were divided into two groups, control (CG) and experimental (VG), at the beginning of the fattening period. The CG and VG lambs were fed the same concentrate and hay. The VG also received a supplement of 45 mg vitamin E (DL-α tocopheryl acetate) per lamb per day for the 75-day fattening period prior to slaughter. After slaughtering, carcasses were stored at 4 0.5C for 24 h. Then , M. longissimus dorsi (LD) muscles were excised from carcasses, and the intra- and intermuscular fats from LD muscles were used as study material. Results showed that vitamin E supplementation had no significant effect on fatty acid composition in intra- and intermuscular fats (P < 0.05). Fatty acid content in intramuscular fats were different than those in intermuscular fats (P < 0.01) except for lauric (C₁₂), linoleic (C_18:2) and linolenic (C_18:3) acids (P < 0.05). Total saturated fatty acids in the intramuscular fats were lower than in intramuscular fats (P < 0.01). In addition, the majority of fatty acids, both intramuscular and intermuscular, in Awassi lambs were oleic (C_18:1), palmitic (C₁₆ and stearic (C₁₈) acids.     

新疆入境旅游客源市场分析及开发策略

本文分析了新疆入境旅游客源市场的时间结构和区域结构(分析了独联体客源市场与游客地理集中指数的关系)及游客平均停留天数和消费结构,揭示了新疆入境旅游客源市场的现状,并提出了开拓新疆国际旅游客源市场的对策和措施.