摘要：In this study,a trifunctional strategy was developed to prepare a confined Ni-based catalyst(Ni-CeO_(2)@SiO_(2))for dry reforming of methane(DRM)of two main greenhouse gases-CO_(2)and CH_(4).The Ni-CeO_(2)@SiO_(2)catalyst was fabricated by utilizing the confinement effect of the SiO_(2)shell and the synergistic interaction between Ni-Ce and the decoking effect of CeO_(2).The catalysts were systematically characterized via X-ray diffraction,N_(2 )adsorption/desorption,transmission electron microscopy,energy dispersive X-ray spectroscopy,hydrogen temperature reduction and desorption set by program,oxygen temperature program desorption,Raman spectroscopy,thermogravimetric analysis,and in situ diffuse reflectance infrared Fourier transform spectroscopy measurements to reveal their physicochemical properties and reaction *** Ni-CeO_(2)@SiO_(2)catalyst exhibited higher activity and stability than the catalyst synthesized via the traditional impregnation *** addition,no carbon deposition was detected over Ni-CeO_(2)@SiO_(2)after a 100 h durability test at 800℃,and the average particle size of Ni nanoparticles(NPs)in the catalyst increased from 5.01 to 5.77 ***,Ni-CeO_(2)@SiO_(2)also exhibited superior low-temperature stability;no coke deposition was observed when the catalyst was reacted at 600℃ for 20 *** high coking and sintering resistance of this confined Ni-based DRM catalyst can be attributed to its trifunctional *** trifunctional strategy developed in this study could be used as a guideline to design other high-performance catalysts for CO_(2)and CH4 dry forming and accelerate their industrialization.

摘要：树型仲裁器是异步电路中常用的电路,它的性能和鲁棒性对整个系统有很大的影响。针对以往树型仲裁器在设计和应用方面存在的问题,设计并实现了一种新型异步树型仲裁器,提高了异步树型仲裁器的鲁棒性。该仲裁器采用了插入差分电路和隔断两级逻辑电路的方法,避免了毛刺的出现。通过重新设计C单元,避免了现有树型仲裁器的死锁问题。在CSMC 0.5μmCMOS工艺下,该仲裁器的最短数据传输时间为4.37 ns,电路平均功耗为50.815 nW。

摘要：为了提升毛巾织造效率,提高后续折叠和包装环节的自动化水平,介绍自动上料毛巾折叠机的原理及控制方程,并对其负压吸盘的结构参数及其吸附特性进行仿真试验;通过改变负压吸盘结构参数,分析进气孔数n、进气孔直径D和吸盘高度h对负压吸盘吸附性能的影响。结果表明:进气孔数n为8、进气孔直径D为6mm、吸盘高度h为25mm和孔形为正方形时,满足吸附力要求,负压吸盘吸附能力较好;出气孔负压值P_1一定时,合理的结构参数有利于提高进气孔负压值P_2,提高吸附力;出气孔负压值P_1由-20kPa降低为-10kPa可使能耗降低50%,且能保证上层毛巾吸附稳定和下层毛巾平整。

摘要：通过对当前物联网的安全威胁进行深入分析,发现SIM卡安全方案在实际使用过程中存在的一些问题。鉴于此,结合安全元件(SE)的SPI接口优点,设计了SPI接口应用在SIM卡上的全新方案,详述了该方案的软硬件架构,最后阐述了该方案在实际应用中所具有的优势。

摘要：国内大多数油田生产用热量很大,其中,位于寒地的大庆油田2022年生产用能总量3.78×10^(6) tec。“双碳”背景下,多数油田开始采用太阳能有序替代燃气加热炉实现部分热利用系统升级换代。然而,太阳能能量密度跨昼夜和季节差异大的特点,造成其应用场景中系统涉及的集热、储热和用热等关键环节设计更为复杂,导致油田应用的投资明显高于传统民用场景,影响其在油田大规模、快速应用推广。通过分析油田现有太阳能热利用系统现状,指出了系统应用过程中存在的问题,针对这些问题和油田用热需求场景,研究了油田太阳能热利用系统集热和储热现有技术及其应用前景,为今后油田大规模开展太阳能热利用技术推广提供参考。

摘要：绝热材料是保证蒸汽管线保温效益的关键,而绝热材料老化则会造成保温性能衰减影响其保温效益。为提高保温性能,建立了蒸汽管线保温效益理论分析模型,研究了三种绝热材料老化引起保温性能衰减对蒸汽管线保温效益的影响,并分析了绝热材料服役年限的影响。研究结果表明:服役时间为20 a时,硅酸盐毡绝热材料老化对其保温性能影响结果最大,与未考虑老化时相比,其经济厚度、热量损失以及年平均总费用增幅分别为15.15%、36.14%、33.83%;服役时间较短时建议选用硅酸盐瓦绝热材料,当服役时间较长时选用气凝胶绝热材料。