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Gain-enhanced reconfigurable radiation array with mechanically driven system and directive elements
《机械工程前沿(英文)》 2022年 第17卷 第4期 doi: 10.1007/s11465-022-0716-0
关键词: mechanism reconfigurable radiation array (RRA) compact state deployed state enhanced gain
基于信息超表面设计理念的一种平面4比特可重构天线阵列 Article
汪正兴, 杨汉卿, 邵睿文, 武军伟, 刘国标, 翟峰, 程强, 崔铁军
《工程(英文)》 2022年 第17卷 第10期 页码 64-74 doi: 10.1016/j.eng.2022.03.019
受信息超表面设计理念即数字编码概念的启发,一种具有0.15λ0(λ0为波长)低剖面的平面4比特可重构天线阵列被提出。这个阵列是基于由1比特磁电偶极子和小型化反射式移相器组成的数字编码辐射单元组成。通过对两个对称馈电端口单独馈电,所提出的1比特磁电偶极子能够在宽带范围内提供“0”和“1”两种数字状态。所涉及的反射式移相器可以提供173°的相对相移。通过在157.5°的相位范围内进行数字量化,可以进一步得到相移间隔22.5°的8种数字状态。为了实现低副瓣水平,一个基于泰勒线源方法的1:16功分器被用来给阵列馈电。我们加工并测试了所提出的4比特天线阵列样机,实验结果与仿真结果吻合很好。阵列能够实现±45°的扫角,12 GHz的最大增益为13.4 dBi,副瓣和交叉极化水平分别低于–14.3 dB和–23 dB。另外,波束指向误差在0.8°,法向波束的3–dB增益带宽为25%。由于阵列卓越的性能,它在雷达和通信系统中将有重要的应用前景。
关键词: 4比特可重构天线阵列 信息超表面 数字编码方法 低副瓣 低剖面
使用猫群算法优化线性天线阵列的最佳阵因子辐射方向图:电磁仿真验证 Article
Gopi RAM, Durbadal MANDAL, Sakti Prasad GHOSHAL, Rajib KAR
《信息与电子工程前沿(英文)》 2017年 第18卷 第4期 页码 570-577 doi: 10.1631/FITEE.1500371
杨凌升,王斌,李雅洁
《信息与电子工程前沿(英文)》 2023年 第24卷 第9期 页码 1357-1365 doi: 10.1631/FITEE.2200542
《机械工程前沿(英文)》 2022年 第17卷 第2期 doi: 10.1007/s11465-022-0675-5
关键词: ceramic parts trimming computer-aided laser manufacturing 3D vision reconfigurable laser processing system
Recent development on innovation design of reconfigurable mechanisms in China
Wuxiang ZHANG, Shengnan LU, Xilun DING
《机械工程前沿(英文)》 2019年 第14卷 第1期 页码 15-20 doi: 10.1007/s11465-018-0517-7
关键词: innovation design reconfigurable mechanisms metamorphic mechanisms origami-derived mechanisms development trends
Distributed flexible reconfigurable condition monitoring and diagnosis technology
HU You-min, YANG Shu-zi, DU Run-sheng
《机械工程前沿(英文)》 2006年 第1卷 第3期 页码 276-281 doi: 10.1007/s11465-006-0025-z
关键词: chemical diagnosis system configuration monitoring equipment
Modular structure of a self-reconfigurable robot
FEI Yanqiong, DONG Qinglei, ZHAO Xifang
《机械工程前沿(英文)》 2007年 第2卷 第1期 页码 116-119 doi: 10.1007/s11465-007-0020-z
关键词: compact self-reconfigurable modular hermaphroditic cone-shaped clutch
Module-based method for design and analysis of reconfigurable parallel robots
Fengfeng XI, Yuwen LI, Hongbo WANG
《机械工程前沿(英文)》 2011年 第6卷 第2期 页码 151-159 doi: 10.1007/s11465-011-0121-6
This paper presents a method for the design and analysis of reconfigurable parallel robots. The inherent modularity in a parallel robot lends itself as a natural candidate for reconfiguration. By taking the branches as building blocks, many modular parallel robots can be constructed, from which a reconfigurable parallel robot can be realized. Among three types of reconfigurations, namely, geometry morphing, topology morphing, and group morphing, the method presented here is for the last two reconfigurations, thereby advancing the current research that is mainly limited to geometry morphing. It is shown that the module-based method not only provides a systematic way of designing a reconfigurable parallel robot, but also offers a unified modeling for robot analysis. Two examples are provided, one showing the topology morphing and the other showing the group morphing.
关键词: reconfigurable parallel robot topology morphing group morphing
Generation of closed-form inverse kinematics for reconfigurable robots
ZHAO Jie, WANG Weizhong, GAO Yongsheng, CAI Hegao
《机械工程前沿(英文)》 2008年 第3卷 第1期 页码 91-96 doi: 10.1007/s11465-008-0013-6
关键词: different effectiveness generation reconfigurable algebraic
Particle therapy for cancers: a new weapon in radiation therapy
null
《医学前沿(英文)》 2012年 第6卷 第2期 页码 165-172 doi: 10.1007/s11684-012-0196-4
Particle irradiation started to draw attention in the past decade and has now become a hotspot in the radiation oncology community. This article reviews the most advanced developments in particle irradiation, focusing on the characteristics of proton and carbon ions in radiation physics and radiobiology. The Bragg peak of physical dose distribution causes proton and carbon beams to optimally meet the requirement for cancer irradiation because the Bragg peak permits the accurate concentration of the dose on the tumor, thus sparing the adjacent normal tissues. Moreover, carbon ion has more radiobiological benefits than photon and proton beams. These benefits include stronger sterilization effects on intrinsic radio-resistant tumors and more effective killing of hypoxic, G0, and S phase cells. Compared with the most advanced radiation techniques using photon, such as three-dimensional conformal radiation therapy and intensity-modulated radiation therapy, proton therapy has yielded more promising outcomes in local control and survival for head and neck cancers, prostate carcinoma, and pediatric cancers. Carbon therapy in Japan showed even more promising results than proton therapy. The local controls and overall survivals were as good as that treated by surgery in early stages of non-small cell lung cancer, hepatocellular carcinoma, prostate carcinoma, and head and neck cancers, especially for such highly resistant tumors as melanoma. The non-invasive nature of particle therapy affords more patients with chances to receive and benefit from treatment. Particle therapy is gradually getting attention from the oncology community. However, the cost of particle therapy facilities has limited the worldwide use of this technology.
关键词: radiation therapy particle therapy proton carbon cancer
Reconfigurable manufacturing systems: Principles, design, and future trends
Yoram KOREN, Xi GU, Weihong GUO
《机械工程前沿(英文)》 2018年 第13卷 第2期 页码 121-136 doi: 10.1007/s11465-018-0483-0
Reconfigurable manufacturing systems (RMSs), which possess the advantages of both dedicated serial lines and flexible manufacturing systems, were introduced in the mid-1990s to address the challenges initiated by globalization. The principal goal of an RMS is to enhance the responsiveness of manufacturing systems to unforeseen changes in product demand. RMSs are cost-effective because they boost productivity, and increase the lifetime of the manufacturing system. Because of the many streams in which a product may be produced on an RMS, maintaining product precision in an RMS is a challenge. But the experience with RMS in the last 20 years indicates that product quality can be definitely maintained by inserting in-line inspection stations. In this paper, we formulate the design and operational principles for RMSs, and provide a state-of-the-art review of the design and operations methodologies of RMSs according to these principles. Finally, we propose future research directions, and deliberate on how recent intelligent manufacturing technologies may advance the design and operations of RMSs.
关键词: reconfigurable manufacturing systems responsiveness intelligent manufacturing
Hui YANG, Hairong FANG, Yuefa FANG, Xiangyun LI
《机械工程前沿(英文)》 2021年 第16卷 第1期 页码 46-60 doi: 10.1007/s11465-020-0606-2
关键词: 5-DOF hybrid manipulator reconfigurable base large workspace dimensional synthesis optimal design
Bachirou GUENE LOUGOU, Yong SHUAI, Xiang CHEN, Yuan YUAN, Heping TAN, Huang XING
《能源前沿(英文)》 2017年 第11卷 第4期 页码 480-492 doi: 10.1007/s11708-017-0506-2
关键词: solar thermochemical reactor incident radiation flux temperature distribution radiation absorptivity radiation emissivity thermal performance analysis
Security of solar radiation management geoengineering
Andrew LOCKLEY
《工程管理前沿(英文)》 2019年 第6卷 第1期 页码 102-116 doi: 10.1007/s42524-019-0008-5
Solar Radiation Management (SRM) geoengineering is a proposed response to anthropogenic global warming (AGW) (National Academy of Sciences, 2015). There may be profound – even violent – disagreement on preferred temperature. SRM disruption risks dangerous temperature rise (termination shock). Concentrating on aircraft-delivered Stratospheric Aerosol Injection (SAI), we appraise threats to SRM and defense methodologies. Civil protest and minor cyberattacks are almost inevitable but are manageable (unless state-sponsored). Overt military attacks are more disruptive, but unlikely – although superpowers’ symbolic overt attacks may deter SRM. Unattributable attacks are likely, and mandate use of widely-available weapons. Risks from unsophisticated weapons are therefore higher. An extended supply chain is more vulnerable than a secure airbase – necessitating supply-chain hardening. Recommendations to improve SRM resilience include heterogeneous operations from diverse, secure, well-stocked bases (possibly ocean islands or aircraft carriers); and avoidance of single-point-of-failure risks (e.g. balloons). A distributed, civilian-operated system offers an alternative strategy. A multilateral, consensual SRM approach reduces likely attack triggers.
关键词: security geoengineering solar radiation ma-nagement SRM
标题 作者 时间 类型 操作
Gain-enhanced reconfigurable radiation array with mechanically driven system and directive elements
期刊论文
A zone-layered trimming method for ceramic core of aero-engine blade based on an advanced reconfigurable
期刊论文
Recent development on innovation design of reconfigurable mechanisms in China
Wuxiang ZHANG, Shengnan LU, Xilun DING
期刊论文
Distributed flexible reconfigurable condition monitoring and diagnosis technology
HU You-min, YANG Shu-zi, DU Run-sheng
期刊论文
Module-based method for design and analysis of reconfigurable parallel robots
Fengfeng XI, Yuwen LI, Hongbo WANG
期刊论文
Generation of closed-form inverse kinematics for reconfigurable robots
ZHAO Jie, WANG Weizhong, GAO Yongsheng, CAI Hegao
期刊论文
Reconfigurable manufacturing systems: Principles, design, and future trends
Yoram KOREN, Xi GU, Weihong GUO
期刊论文
Dimensional synthesis of a novel 5-DOF reconfigurable hybrid perfusion manipulator for large-scale spherical
Hui YANG, Hairong FANG, Yuefa FANG, Xiangyun LI
期刊论文
Analysis of radiation heat transfer and temperature distributions of solar thermochemical reactor for
Bachirou GUENE LOUGOU, Yong SHUAI, Xiang CHEN, Yuan YUAN, Heping TAN, Huang XING
期刊论文