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A new miniaturized engine based on thermomagnetic effect of magnetic fluids

Lujun ZHOU, Yimin XUAN, Qiang LI, Wenlei LIAN

Frontiers in Energy 2009, Volume 3, Issue 2, Pages 160-166 doi: 10.1007/s11708-009-0018-9

Abstract: A new engine system, essentially consisting of a permanent NdFeB magnet, a kerosene-based magnetic fluid and a rotor, is proposed based on the thermomagnetic effect of a temperature-sensitive magnetic fluid. The rotor was driven by the thermal convection of the magnetic fluid in the presence of a homogeneous external magnetic field. A digital camera was used to record the rotation speed of the rotor to investigate the performance of the engine system under varying conditions such as heat load, heat sink temperature, and magnetic field distribution. The peak angle velocity obtained for the rotor was about 2.1 rad/min. The results illustrate that the rotation speed of the rotor increases as the input heat load increases, or as the heat sink temperature decreases. The performance of the motor is considerably influenced by the magnetic field imposed. Therefore, the performance of such an engine can be controlled conveniently by changing the external magnetic field and/or the temperature distribution in the fluid.

Keywords： magnetic fluid thermomagnetic effect engine

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An AuNPs/Mesoporous NiO/Nickel Foam Nanocomposite as a Miniaturized Electrode for Heavy Metal Detection Article

Boyuan Xue, Qian Yang, Kaidong Xia, Zhihong Li, George Y. Chen, Dayi Zhang, Xiaohong Zhou

Engineering 2023, Volume 27, Issue 8, Pages 199-208 doi: 10.1016/j.eng.2022.06.005

Abstract: We present a nanocomposite-based miniaturized electrode for the concurrent measurement of Pb^{2+

Keywords：

AuNPs


Mesoporous NiO


Miniaturized electrode


Heavy metal ions


Groundwater


Square wave voltammetry


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Human power-based energy harvesting strategies for mobile electronic devices

Dewei JIA, Jing LIU

Frontiers in Energy 2009, Volume 3, Issue 1, Pages 27-46 doi: 10.1007/s11708-009-0002-4

Abstract: Energy problems arise with the proliferation of mobile electronic devices, which range from entertainment tools to life saving medical instruments. The large amount of energy consumption and increasing mobility of electronic devices make it urgent that new power sources should be developed. It has been gradually recognized that the human body is highly flexible in generating applicable power from sources of heat dissipation, joint rotation, enforcement of body weight, vertical displacement of mass centers, and even elastic deformation of tissues and other attachments. These basic combinations of daily activities or metabolic phenomena open up possibilities for harvesting energy which is strong enough to power mobile or even implantable medical devices which could be used for a long time or be recharged permanently. A comprehensive review is presented in this paper on the latest developed or incubating electricity generation methods based on human power which would serve as promising candidates for future mobile power. Thermal and mechanical energy, investigated more thoroughly so far, will particularly be emphasized. Thermal energy relies on body heat and employs the property of thermoelectric materials, while mechanical energy is generally extracted in the form of enforcement or displacement excitation. For illustration purposes, the piezoelectric effect, dielectric elastomer and the electromagnetic induction couple, which can convert force directly into electricity, were also evaluated. Meanwhile, examples are given to explain how to adopt inertia generators for converting displacement energy via piezoelectric, electrostatic, electromagnetic or magnetostrictive vibrators. Finally, future prospects in harvesting energy from human power are made in conclusion.

Keywords： mobile electronic device human power energy harvesting micro/miniaturized generator battery green energy

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Miniaturized five fundamental issues about visual knowledge Perspectives

Yun-he Pan,panyh@zju.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 5, Pages 615-766 doi: 10.1631/FITEE.2040000

Abstract: 认知心理学早已指出，人类知识记忆中的重要部分是视觉知识，被用来进行形象思维。因此，基于视觉的人工智能（AI）是AI绕不开的课题，且具有重要意义。本文继《论视觉知识》一文，讨论与之相关的5个基本问题：（1）视觉知识表达；（2）视觉识别；（3）视觉形象思维模拟；（4）视觉知识的学习；（5）多重知识表达。视觉知识的独特优点是具有形象的综合生成能力，时空演化能力和形象显示能力。这些正是字符知识和深度神经网络所缺乏的。AI与计算机辅助设计/图形学/视觉的技术联合将在创造、预测和人机融合等方面对AI新发展提供重要的基础动力。视觉知识和多重知识表达的研究是发展新的视觉智能的关键，也是促进AI 2.0取得重要突破的关键理论与技术。这是一块荒芜、寒湿而肥沃的“北大荒”，也是一块充满希望值得多学科合作勇探的“无人区”。

Keywords：视觉知识表达；视觉识别；视觉形象思维模拟；视觉知识学习；多重知识表达

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Integrated 60-GHz miniaturized wideband metasurface antenna in a GIPD process Research Articles

Hai-yang XIA, Jin-can HU, Tao ZHANG, Lian-ming LI, Fu-chun ZHENG

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 1, Pages 174-181 doi: 10.1631/FITEE.1900453

Abstract: We propose a miniaturized wideband metasurface antenna for 60-GHz antenna-in-package applications.

Keywords： Coplanar-waveguide-fed (CPW-fed) ring resonators Glass integrated passive device (GIPD) Metasurface antenna Miniaturized

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Development of meso-scale milling machine tool and its performance analysis

LI Hongtao, LAI Xinmin, LI Chengfeng, LIN Zhongqin, MIAO Jiancheng, NI Jun

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 1, Pages 59-65 doi: 10.1007/s11465-008-0005-6

Abstract: ultra precision machining, this paper focuses on the investigations on the meso milling process with a miniaturizedThrough test analysis, the meso milling process with a miniaturized machine tool is proved to be feasible

Keywords： applicable machining mechanical overview positioning subsystem miniaturized

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Miniaturized Rotman lens with applications to wireless communication Research Articles

Bao-hua SUN, Qiu-yan LIANG, Gao-nan ZHOU

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 1, Pages 144-158 doi: 10.1631/FITEE.1900501

Abstract: Moreover, two possible applications of the proposed miniaturized Rotman lens to wireless communication

Keywords： Rotman lens Miniaturization Multibeam Beamformer Wireless communication

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The Twenty Third International Conference on Miniaturized Systems for Chemistry and Life Sciences (μTAS

Conference Date: 27 Oct 2019

Conference Place: 瑞士/巴塞尔城市

Administered by: Institute of Electrical and Electronics Engineers

Miniaturized UWB multi-resonance patch antenna loaded with novel modified H-shape SRR metamaterial for Article

Parul DAWAR, N. S. RAGHAVA, Asok DE

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 11, Pages 1883-1891 doi: 10.1631/FITEE.1601193

Abstract: We present the design and analysis of a novel modified H-shaped split ring resonator (SRR) metamaterial. It has negative permeability and permittivity characteristics with multi-band resonance for the X, Ku, and Ka frequency bands. Different configurations of the patch antenna have been analyzed with different orientations and positions of the metamaterial. Optimized performance was achieved with the new shape of the metamaterial antenna with an appreciable 9 dB gain, 77 GHz bandwidth, 100% radiation efficiency, and 65% reduction in active area. The second-order fractal metamaterial antenna achieves high min-iaturization on the order of 1/21. This is truly a boon in the communications world, as a sharp beam with smaller physical di-mensions is urgently required.

Keywords： Ultra-wideband (UWB) Antenna Metamaterial