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Laser interference fabrication of large-area functional periodic structure surface
Lei WANG, Zi-Han WANG, Yan-Hao YU, Hong-Bo SUN
《机械工程前沿(英文)》 2018年 第13卷 第4期 页码 493-503 doi: 10.1007/s11465-018-0507-9
Functional periodic structures have attracted significant interest due to their natural capabilities in regulating surface energy, surface effective refractive index, and diffraction. Several technologies are used for the fabrication of these functional structures. The laser interference technique in particular has received attention because of its simplicity, low cost, and high-efficiency fabrication of large-area, micro/nanometer-scale, and periodically patterned structures in air conditions. Here, we reviewed the work on laser interference fabrication of large-area functional periodic structures for antireflection, self-cleaning, and superhydrophobicity based on our past and current research. For the common cases, four-beam interference and multi-exposure of two-beam interference were emphasized for their setup, structure diversity, and various applications for antireflection, self-cleaning, and superhydrophobicity. The relations between multi-beam interference and multi-exposure of two-beam interference were compared theoretically and experimentally. Nanostructures as a template for growing nanocrystals were also shown to present future possible applications in surface chemical control. Perspectives on future directions and applications for laser interference were presented.
关键词: laser interference four-beam interference multi-exposure of two-beam interference additive fabrication
Jian LI,Caichao WAN
《农业科学与工程前沿(英文)》 2015年 第2卷 第4期 页码 341-346 doi: 10.15302/J-FASE-2015082
关键词: cellulose aerogels carbon nanotubes electromagnetic interference shielding composites
Xiaoliang MENG, Ledong ZHU, Zhenshan GUO
《结构与土木工程前沿(英文)》 2011年 第5卷 第4期 页码 510-517 doi: 10.1007/s11709-011-0129-3
关键词: separated parallel decks vortex-induced vibration aerodynamic interference aerodynamic mitigation measure semi-closed box deck full-closed box deck
Jin WANG,Feng SHU,Ri-qing CHEN,Yu-di CUI,Yu CHEN,Jun LI
《信息与电子工程前沿(英文)》 2016年 第17卷 第3期 页码 265-280 doi: 10.1631/FITEE.1500134
关键词: Multi-pair two-way relay Adaptive robust beamformer Channel state information (CSI) Maximum signal-to-interference-and-noise ratio (Max-SINR) Maximum signal-to-leakage-and-noise ratio (Max-SLNR)
Proposing two new methods to decrease lateral-torsional buckling in reduced beam section connections
Samira EBRAHIMI; Nasrin BAKHSHAYESH EGHBALI; Mohammad Mehdi AHMADI
《结构与土木工程前沿(英文)》 2022年 第16卷 第12期 页码 1581-1598 doi: 10.1007/s11709-022-0886-1
关键词: RBS RBS-ST RW-RBS lateral-torsional buckling cyclic performance
《机械工程前沿(英文)》 2022年 第17卷 第4期 doi: 10.1007/s11465-022-0703-5
关键词: laser beam welding parameter optimization metamodel multi-objective
Jaroon RUNGAMORNRAT, Chung Nguyen VAN
《结构与土木工程前沿(英文)》 2019年 第13卷 第1期 页码 201-214 doi: 10.1007/s11709-018-0488-0
关键词: multi-field problems defining curve exact geometry general boundary conditions SBFEM
null
《机械工程前沿(英文)》 2014年 第9卷 第2期 页码 191-202 doi: 10.1007/s11465-014-0293-y
In present study, free vibration of cracked beams resting on two-parameter elastic foundation with elastically restrained ends is considered. Euler-Bernoulli beam hypothesis has been applied and translational and rotational elastic springs in each end considered as support. The crack is modeled as a mass-less rotational spring which divides beam into two segments. After governing the equations of motion, the differential transform method (DTM) has been served to determine dimensionless frequencies and normalized mode shapes. DTM is a semi-analytical approach based on Taylor expansion series that converts differential equations to recursive algebraic equations. The DTM results for the natural frequencies in special cases are in very good agreement with results reported by well-known references. Also, the DTM procedure yields rapid convergence beside high accuracy without any frequency missing. Comprehensive studies to analyze the effects of crack location, crack severity, parameters of elastic foundation and boundary conditions on dimensionless frequencies as well as effects of elastic boundary conditions on cracked beams mode shapes are carried out and some problems handled for first time in this paper. Since this paper deals with general problem, the derived formulation has capability for analyzing free vibration of cracked beam with every boundary condition.
关键词: free vibration cracked beam elastic foundation restrained ends differential transform method
Huilong WANG, Shuqin LIU, Hui WANG, Wenfeng JIANG,
《环境科学与工程前沿(英文)》 2010年 第4卷 第3期 页码 311-320 doi: 10.1007/s11783-010-0237-7
关键词: sol-gel multi-walled carbon nanotubes (MWCNTs)/TiO2 composite photocatalysis azo dye solar irradiation
Elastoplastic frictional contact problem study on interference fits of compressor
ZHANG Hongwu, WU Changhua, LIAO Aihua
《能源前沿(英文)》 2008年 第2卷 第3期 页码 313-319 doi: 10.1007/s11708-008-0026-1
关键词: computation thickness interference-fit interference unspecified
李玲,阮奇
《中国工程科学》 2008年 第10卷 第10期 页码 54-60
建立了带有冷凝水闪蒸的有固相析出的多效两段蒸发系统的常规设计数学模型,模型将系统的相平衡关系用回归式表达,使模型可以用计算机编程求解,避免了手工计算结合查相图的烦琐的计算过程;利用矩阵方程具有结构清晰和高度模块化的特点,将系统的物料衡算和热量衡算方程组写成矩阵方程的形式,只要保留或舍弃矩阵方程中的相关块矩阵,模型就能代表没有冷凝水闪蒸或没有固相析出的多效两段蒸发系统常规设计模型;采用迭代法结合矩阵法来求解模型,算例表明,冷凝水闪蒸对多效两段蒸发系统是有效的节能措施,算法收敛速度快、收敛稳定性好。
关键词: 固相析出 多效两段蒸发数学模型 冷凝水闪蒸
《环境科学与工程前沿(英文)》 2023年 第17卷 第7期 doi: 10.1007/s11783-023-1684-2
● This study explored the long-term association by double robust additive models.
关键词: Air pollution Cerebrovascular disease Incidence Long-term exposure Doubly robust additive model
Construction and identification of lentiviral RNA interference vector of rat leptin receptor gene
Zhengjuan LIU, Jie BIAN, Yuchuan WANG, Yongli ZHAO, Dong YAN, Xiaoxia WANG
《医学前沿(英文)》 2009年 第3卷 第1期 页码 57-60 doi: 10.1007/s11684-009-0003-z
面向5G多波束MIMO系统应用的基于先进LTCC封装的39 GHz双信道收发机芯片组 Aticle
余益明, 陈志林, 赵晨曦, 刘辉华, 吴韵秋, 尹文言, 康凯
《工程(英文)》 2023年 第22卷 第3期 页码 125-140 doi: 10.1016/j.eng.2022.04.023
本文介绍了一种用于5G多输入多输出(MIMO)应用的39 GHz收发机前端芯片组。每个芯片包括两个可变增益变频信道,可以支持两个同时独立的波束。该芯片还集成了一个本地振荡器链和数字模块,用于多芯片的扩展和增益状态控制。为了提高射频性能,针对前端系统中的关键构建模块提出了几种电路级改进技术。此外,还开发了先进的低温共烧陶瓷工艺,用于封装39 GHz双信道收发机芯片组,实现了低封装损耗和两个发射(TX)/接收(RX)信道之间的高隔离。通过进行芯片级和系统封装(SIP)级的测量,展示了收发机芯片组的性能。测量特性表明,TX SIP 提供11 dB 的最大增益和10 dBm饱和输出功率,而RX SIP实现52 dB的最大增益,5.4 dB噪声系数和7.2 dBm输出1 dB压缩点。收发机的单信道通信链路测试显示,对于64 次正交幅度调制(QAM),误差矢量幅度(EVM)为3.72%,频谱效率为3.25 位⋅s−1⋅ Hz−1。对于1 m距离内的256-QAM 调制,EVM为3.76%,频谱效率为3.9 位⋅s−1⋅Hz−1。在该芯片组的基础上,还开发了39 GHz的多波束原型,用于执行5G毫米波应用的MIMO操作。用于单流和双流传输的空中通信链路表明,多波束原型可以覆盖5~150 m的距离,具有相当的吞吐量。
林迪,沙学军,吴宣利,张乃通
《中国工程科学》 2009年 第11卷 第2期 页码 75-81
为分析多径环境下脉冲超宽带跳时多址系统的传输性能,通过研究IEEE802.4.53a工作组给出的多 径信道参考模型,提出了一个同时存在符号间干扰、符号内多径干扰和多用户干扰的跳时超宽带系统相干解 调的性能分析模型,分别得到了符号内多径干扰、符号间干扰和多用户干扰的方差,且推导得到了系统的误 比特率计算公式,并用计算机仿真验证了公式的有效性。通过计算相邻多径的平均间隔,论证了符号内脉冲 自身多径的干扰是不可忽略的。在不同的信道环境下,以一定误码率要求作为衡量标准,比较了单用户系统 中仅考虑符号间干扰和同时考虑符号内多径干扰及符号间干扰的用户最高传输速率,并分析了多用户系统 中接入不同用户数时对应的平均传输速率的上限。
标题 作者 时间 类型 操作
Laser interference fabrication of large-area functional periodic structure surface
Lei WANG, Zi-Han WANG, Yan-Hao YU, Hong-Bo SUN
期刊论文
Cellulose aerogels decorated with multi-walled carbon nanotubes: preparation, characterization, and applicationfor electromagnetic interference shielding
Jian LI,Caichao WAN
期刊论文
Aerodynamic interference effects and mitigation measures on vortex-induced vibrations of two adjacent
Xiaoliang MENG, Ledong ZHU, Zhenshan GUO
期刊论文
Adaptive robust beamformer formulti-pair two-way relay networks with imperfect channel state information
Jin WANG,Feng SHU,Ri-qing CHEN,Yu-di CUI,Yu CHEN,Jun LI
期刊论文
Proposing two new methods to decrease lateral-torsional buckling in reduced beam section connections
Samira EBRAHIMI; Nasrin BAKHSHAYESH EGHBALI; Mohammad Mehdi AHMADI
期刊论文
Processing parameter optimization of fiber laser beam welding using an ensemble of metamodels and MOABC
期刊论文
Scaled boundary finite element method with exact defining curves for two-dimensional linear multi-field
Jaroon RUNGAMORNRAT, Chung Nguyen VAN
期刊论文
Semi-analytical approach for free vibration analysis of cracked beams resting on two-parameter elastic
null
期刊论文
Solar photocatalytic decomposition of two azo dyes on multi-walled carbon nanotubes (MWCNTs)/TiO 2 composites
Huilong WANG, Shuqin LIU, Hui WANG, Wenfeng JIANG,
期刊论文
Elastoplastic frictional contact problem study on interference fits of compressor
ZHANG Hongwu, WU Changhua, LIAO Aihua
期刊论文
Long-term exposure to air pollution and cerebrovascular disease: findings from Beijing Health Management
期刊论文
Construction and identification of lentiviral RNA interference vector of rat leptin receptor gene
Zhengjuan LIU, Jie BIAN, Yuchuan WANG, Yongli ZHAO, Dong YAN, Xiaoxia WANG
期刊论文