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以桉木溶解浆生产过程中的副产物预水解液为原料,采用水热碳化工艺对预水解液进行处理,以制备碳微球。探讨了水热碳化过程中聚(4-苯乙烯磺酸-马来酸共聚物)钠盐(PSSMA)用量对碳微球形貌及得率的影响,并探究了不同结构碳微球的成形机理。结果表明,预水解液是制备碳微球的理想碳源,PSSMA可通过在碳微球表面提供静电斥力以调控碳微球形貌,使碳微球由交联的球簇结构转变为单分散微球结构和微球超结构。随着PSSMA用量增加和碳化时间的延长,碳微球及其超结构的粒径均呈先下降再趋于平缓的趋势;但PSSMA对碳微球得率的影响较小。 相似文献
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采用直流对靶磁控溅射低价态氧化钒(VO2-x)薄膜再附加热氧化处理的方式,进行具有金属-半导体相变特性氧化钒薄膜的制备.采用X射线光电子能谱(XPS)、X射线衍射(XRD)和原子力显微镜(AFM)对薄膜中钒的价态与组分、薄膜结晶结构和表面微观形貌进行分析,利用热敏感系统对薄膜的电阻温度特性进行测量.结果表明:新制备的低价态氧化钒薄膜以V2O3和VO为主,经过300℃低温热氧化处理后,薄膜中出现单斜金红石结构的VO2相,薄膜具有金属-半导体相变特性;薄膜表面颗粒之间存在间隙,利于氧的渗入:在300~320℃进行热处理时,薄膜中的V2O3和VO向单斜结构的VO2转变,VO2含量增加,随着薄膜内VO2含量的增加,薄膜的金属-半导体相变幅度增大,超过2个数量级,相变性能变好,但是此热处理温度区间对已获得的VO2的结构没有影响.同时利用直流对靶磁控溅射方法还可以在低氧化温度下获得具有优异金属-半导体相变特性的氧化钒薄膜,制备工艺与微机械电子系统(MEMS)工艺相兼容. 相似文献
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The single scratching test of polymer polycarbonate (PC) sample surface using an atomic force microscope (AFM) diamond tip for fabricating ripple patterns has been studied with the focus on the evaluation of the effect of the tip scratching angle on the pattern formation. The experimental results indicated that the different oriented ripples can be easily machined by controlling the scratching angles of the AFM. And, the effects of the normal load and the feed on the ripples formation and their periods were also studied. Based on the ripple pattern formation, we firstly proposed a two-step scratching method to fabricate controllable and oriented complex three-dimensional (3D) nanodot arrays. These typical ripple formations can be described via a stick-slip and crack formation process. 相似文献
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Very thin films, less than 100 nm-thick, are used in a variety of applications, including as catalysts and for thin film reactions
to form patterned silicides in electronic devices. Because of their high surface to volume ratio, these very thin films are
subject to cap-illary instability and can agglomerate well below their melting temperatures. In order to develop a general
understanding of agglomeration in very thin films, we have studied initially continuous and patterned films of gold on fused
silica substrates. Two in situ techniques were used to monitor agglomeration: 1) heating and video recording in a transmission
electron microscope, and 2) measurement of the intensity of laser light transmitted through a sample heated in a furnace.
Electron microscopy allowed inves-tigation of the role of the microstructure of the Au film and analysis of light transmis-sion
during heating allowed determination of temperature-dependent and film-thick-ness-dependent agglomeration rates. These results
will be described along with models for the agglomeration process. 相似文献
8.
Jiran Dong Jinsong Zeng Jinpeng Li Pengfei Li Bin Wang Jun Xu Wenhua Gao Kefu Chen 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(40):2301353
2D carbon nanomaterials such as graphene, carbon nanosheets, and their derivatives, representing the emerging class of advanced multifunctional materials, have gained great research interest because of their extensive applications ranging from electrochemistry to catalysis. However, sustainable and scalable synthesis of 2D carbon nanosheets (CNs) with hierarchical architecture and irregular structure via a green and low-cost strategy remains a great challenge. Herein, prehydrolysis liquor (PHL), an industrial byproduct of the pulping industry, is first employed to synthesize CNs via a simple hydrothermal carbonization technique. After mild activation with NH4Cl and FeCl3, the as-prepared activated CNs (A-CN@NFe) display an ultrathin structure (≈3 nm) and a desirable specific surface area (1021 m2 g−1) with hierarchical porous structure, which enables it to be both electroactive materials and structural support materials in nanofibrillated cellulose/A-CN@NFe/polypyrrole (NCP) nanocomposite, and thus endowing nanocomposite with impressive capacitance properties of 2546.3 mF cm−2 at 1 mA cm−2. Furthermore, the resultant all-solid-state symmetric supercapacitor delivers a satisfactory energy storage ability of 90.1 µWh cm−2 at 250.0 µW cm−2. Thus, this work not only opens a new window for sustainable and scalable synthesis of CNs, but also offers a double profits strategy for energy storage and biorefinery industry. 相似文献
9.
Liang Jiran Wu Wenhao Lou Qun Wang Kangqiang Xuan Chang 《Journal of Materials Science: Materials in Electronics》2022,33(19):15473-15482
Journal of Materials Science: Materials in Electronics - The VO2(B)/rGO composite structure was proposed to improve the gas sensitivity response of VO2(B) at room temperature (25 °C)... 相似文献
10.
信息共享和设备之间的可互操作性作为智能变电站的主要特点,可提供丰富的二次设备运行及状态信息,给二次设备的状态监测和状态检修带来了极大的便利。但目前针对二次设备的状态监测的研究如交换机信息建模还存在着不足。在此背景下,首先探讨了智能变电站二次设备状态监测的概念和监测对象,其次分析了信息建模和监测数据分析处理方面的关键技术和方法,并针对交换机和网络拓扑给出了一种建模方案。随后总结了几种利用状态监测数据进行二次设备故障诊断的方法,并分析了各种方法的优点、不足以及适用场合。最后,结合目前国内二次设备状态监测的研究和实际应用现状,展望了未来的研究方向和应用前景。 相似文献