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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. 相似文献
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MAHMUT?BUCURGATEmail author SELAHATTIN?OZDEMIR TEZER?FIRAT 《Bulletin of Materials Science》2016,39(6):1521-1529
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. 相似文献
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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。 相似文献
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MUHAMMET RFAN AKSU MAHMUT ÜNSAL MÜKERREM KAYA MUHLS MACIT 《Journal of Muscle Foods》2004,15(3):173-182
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 (C18:2 ) and linolenic (C18:3 ) 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 (C18:1 ), palmitic (C16 and stearic (C18 ) acids. 相似文献
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MAHMUT PARLAR 《International journal of systems science》2013,44(9):1373-1380
In this paper, a production control model proposed by Holt, Modigliani, Muth and Simon and a marketing model suggested by Nerlove and Arrow, are combined to produce an optimal control problem with two state variables, two control variables and inequality constraints on these variables. The optimal production rate and advertising expenditures over time are determined using the maximum principle. Due to the complex nature of the necessary conditions, the numerical technique known as the initial-value shooting method, is used to generate optimal trajectories. A numerical example is presented to illustrate the solution. 相似文献