排序方式: 共有17条查询结果,搜索用时 15 毫秒
1.
Lu Yuchan He Qiao Peng Qiao Chen Wenhai Cheng Qunpeng Song Guangsen Fan Guozhi 《Cellulose (London, England)》2021,28(13):8343-8354
Cellulose - The coproduction of 5-hydroxymethylfurfural (5-HMF) and furfural (FUR) via the direct hydrolysis of holocellulose analogue composed of cellulose and hemicellulose was investigated. The... 相似文献
2.
本文介绍了通过测量束流在输运管壁上形成的感应电流,来确定直线感应加速器束流大小、位置的一种方法。实验证明,这种测量方法不会影响电子束在管道中的传输,且测量精度高,装置简单,并可装在真空系统的外面,便于维修。 相似文献
3.
磁脉冲压缩器用脉冲变压器的设计 总被引:4,自引:3,他引:1
本文简要说明了磁脉冲压缩器的工作原理。着重介绍了其输入、输出脉冲变压器的等效回路设计法。并将该方法用于实例进行验证。结果说明,这种设计方法是非常成功的,而且可以推广到一般情况下的脉冲变压器的设计。 相似文献
4.
5.
Preparation and characterization of palladium immobilized on silica‐coated Fe3O4 and its catalytic performance for Suzuki reaction under microwave irradiation 下载免费PDF全文
Ming Luo Chaoneng Dai Qingyue Han Guozhi Fan Guangsen Song 《Surface and interface analysis : SIA》2016,48(10):1066-1071
Supported palladium catalyst (Pd/Fe3O4@SiO2) was easily prepared by supporting PdCl2 on silica‐coated magnetic nanoparticles Fe3O4 in ethylene glycol. The as‐prepared sample was characterized by infrared spectroscopy (IR), X‐ray diffraction (XRD) and X‐ray photoelectron spectrometer (XPS). The formation of active specie Pd(0) was confirmed by XRD and XPS, and the Pd loading for the fresh and recovered catalyst was determined by atomic absorption spectroscopy (AAS). Pd/Fe3O4@SiO2 was employed for the synthesis of biphenyl derivatives via Suzuki reaction. In terms of the yield of biphenyl, the supported catalyst displayed nearly equal catalytic performance to that of homologous PdCl2 under microwave irradiation for 30 min but higher than that obtained by traditional heating method for 12 h. The catalytic performance of Pd/Fe3O4@SiO2 for Suzuki reactions involving various aryl halides and arylboronic acids were also examined. Impressive yield of biphenyl at 68.2% was obtained even in the presence of unreactive aryl chlorides. Pd/Fe3O4@SiO2 was recovered by a permanent magnet and directly reused in the next run, and no obvious deactivation was observed for up to 6 times. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
6.
Shanwu Ke Li Jiang Yifan Zhao Yongyue Xiao Bei Jiang Gong Cheng Facai Wu Guangsen Cao Zehui Peng Min Zhu Cong Ye 《Frontiers of Physics》2022,17(5):53508
Artificial synapse is one of the potential electronics for constructing neural network hardware. In this work, Pt/LiSiOx/TiN analog artificial synapse memristor is designed and investigated. With the increase of compliance current (C. C.) under 0.6 mA, 1 mA, and 3 mA, the current in the high resistance state (HRS) presents an increasing variation, which indicates lithium ions participates in the operation process for Pt/LiSiOx/TiN memristor. Moreover, depending on the movement of lithium ions in the functional layer, the memristor illustrates excellent conduction modulation property, so the long-term potentiation (LTP) or depression (LTD) and paired-pulse facilitation (PPF) synaptic functions are successfully achieved. The neural network simulation for pattern recognition is proposed with the recognition accuracy of 91.4%. These findings suggest the potential application of the LiSiOx memristor in the neuromorphic computing. 相似文献
7.
本文介绍一台小型磁脉冲调制器的实验。实验已得到30kV以上,上升时间15ns,半高宽50ns的较好输出波形。该系统以猝发脉冲方式工作。脉冲串重复率为1Hz,脉冲重复率大于1kHz,串内脉冲数为10。实验的初步成功标志着建造高功率磁脉冲调制器完全可能。 相似文献
8.
介绍在52ns高功率脉冲作用下,带绕金属玻璃环的脉冲特性,并详细地分析金属玻璃环有无层间绝缘对其磁性能的影响情况。金属玻璃环与铁氧体环的脉冲特性结果的对比表明,有层间绝缘的金属玻璃环磁特性明显优于铁氧体环的磁特性。 相似文献
9.
50ns脉冲下的铁氧体大环试验 总被引:1,自引:0,他引:1
本文叙述了50ns脉冲下的铁争体大环试验,环外直径50cm、内直径2—25cm、厚2.5cm。给出了铁氧体环的电压和劢磁电流及复位电流波形,以及典型的脉冲⊿B~⊿H曲线。当脉冲复位场峰值为2—4Oe时,得到通量振幅⊿B>0.7T,增量导磁率μ_△>400。 相似文献
10.
固相复合抗体放射免疫分析法测定人体SOD的含量 总被引:3,自引:0,他引:3
本文描述了固相复合抗体放射免疫分析法测定人血清和红血球中超氧化物歧化酶的含量,该法灵敏度为0.5ng,非特异为2.0±0.6%,批内误差在3.4%~4.2%(n=9)之间,批间误差在7.0%~7.5%(n=6)之间,经测定,人血清正常值为291±79(x±s)ng/mL,红血球正常值为861±95(x±s)×10^-6Hb。该法灵敏度高、特异性好,简便,快速,适于分析大量样品。 相似文献