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Song ZHANG, Lelun WANG, Anze YI, Honggang GU, Xiuguo CHEN, Hao JIANG, Shiyuan LIU
《机械工程前沿(英文)》 2020年 第15卷 第2期 页码 256-264 doi: 10.1007/s11465-019-0573-7
关键词: ferroelectric liquid crystal polarization rotator (FLCPR) dual liquid crystal Mueller matrix polarizer design and optimization
WANG Shoulian, HE Jie, ZENG Yu, YAN Bin, WANG Yinghan
《化学科学与工程前沿(英文)》 2008年 第2卷 第3期 页码 265-268 doi: 10.1007/s11705-008-0054-8
Room temperature liquid metal: its melting point, dominating mechanism and applications
Junheng FU, Chenglin ZHANG, Tianying LIU, Jing LIU
《能源前沿(英文)》 2020年 第14卷 第1期 页码 81-104 doi: 10.1007/s11708-019-0653-8
关键词: melting point liquid metal crystal thermodynamics molecular dynamics
基于5 μm厚向列相液晶的高效圆极化相控阵系统的设计、校准和实验验证 Article
Xin Yu Wu,Fengshuo Wan,Hongyuan Feng,Shichao Jin,Chong Guo,Yu Wei,Dunge Liu,Yuqian Yang,Longzhu Cai,Zhi Hao Jiang,Wei Hong
《工程(英文)》 2024年 第32卷 第1期 页码 70-82 doi: 10.1016/j.eng.2023.08.013
This paper presents a systematic investigation and demonstration of a K-band circularly polarized liquid-crystal-based phased array (LCPA), including the design, over-the-air (OTA) in-array calibration, and experimental validation. The LCPA contains 16 phase-shifting radiating channels, each consisting of a circularly polarized stacked patch antenna and a liquid-crystal-based phase shifter (LCPS) based on a loaded differential line structure. Thanks to its slow-wave properties, the LCPS exhibits a maximum phase-shifting range of more than 360° with a figure of merit of 78.3°·dB−1 based on a liquid crystal layer with a thickness of only 5 μm. Furthermore, an automatic OTA calibration based on a state ergodic method is proposed, which enables the extraction of the phase–voltage curve of every individual LCPA channel. The proposed LCPA is manufactured and characterized with a total profile of only 1.76 mm, experimentally demonstrating a scanned circularly polarized beam from −40° to +40° with a measured peak gain of 12.5 dBic and a scanning loss of less than 2.5 dB. The bandwidth of the LCPA, which satisfies the requirements of port reflection (|S11|) < −15 dB, an axial ratio (AR) < 3 dB, beam squinting < 3°, and a gain variation < 2.2 dB, spans from 25.5 to 26.0 GHz. The total efficiency is about 34%, which represents a new state of the art. The use of the demonstrated low-profile LCPA to support circularly polarized scanning beams, along with the systematic design and calibration methodology, holds potential promise for a variety of millimeter-wave applications.
关键词: Circularly polarized Liquid crystal Liquid-crystal-based phased array (LCPA) Phase shifter Over-the-air (OTA) calibration
Research progress on ultra-precision machining technologies for soft-brittle crystal materials
Hang GAO,Xu WANG,Dongming GUO,Yuchuan CHEN
《机械工程前沿(英文)》 2017年 第12卷 第1期 页码 77-88 doi: 10.1007/s11465-017-0411-8
Soft-brittle crystal materials are widely used in many fields, especially optics and microelectronics. However, these materials are difficult to machine through traditional machining methods because of their brittle, soft, and anisotropic nature. In this article, the characteristics and machining difficulties of soft-brittle and crystals are presented. Moreover, the latest research progress of novel machining technologies and their applications for soft-brittle crystals are introduced by using some representative materials (e.g., potassium dihydrogen phosphate (KDP), cadmium zinc telluride (CZT)) as examples. This article reviews the research progress of soft-brittle crystals processing.
关键词: brittle soft functional crystal ultra-precision machining
范学良,程晓舫,许军
《中国工程科学》 2004年 第6卷 第6期 页码 57-62
利用光学及辐射度学的基本原理,对成像过程进行理论分析,建立了照明条件下识别视场中高温目标的数学模型,揭示了影响识别效果的各物理因素。通过对这些物理因素进行分析,指出“切割波段”可有效提高信噪比,将高温目标识别出来,并通过液晶光阀予以技术实现。实验结果验证了该方案的可行性及有效性。
Qianqian Guo, Irmgard Kalf, Ulli Englert
《化学科学与工程前沿(英文)》 2018年 第12卷 第3期 页码 433-439 doi: 10.1007/s11705-018-1743-6
Diffusion reaction of the labile building block Mg(acacCN)2 (acacCN= 3-cyanoacetylacetonate) with silver salts leads to a series of solvated Mg/Ag bimetallic coordination polymers with composition [Mg(acacCN)3Ag]·solvent. Despite their common stoichiometry, the topology of these polymers depends on the solvent of crystallization. The two-dimensional coordination compound [Mg(acacCN)3Ag]·4CHCl3 in space group P
关键词: ditopic ligand substituted acetylacetone desolvation diffraction
Shuman Xu, Xiaoxiao Zhang, Dangguo Cheng, Fengqiu Chen, Xiaohong Ren
《化学科学与工程前沿(英文)》 2018年 第12卷 第4期 页码 780-789 doi: 10.1007/s11705-018-1733-8
关键词: hierarchical ZSM-5 crystal size catalytic cracking Thiele modulus effectiveness factor
《化学科学与工程前沿(英文)》 2023年 第17卷 第10期 页码 1503-1515 doi: 10.1007/s11705-022-2294-4
关键词: insoluble drugs polymer inhibition crystallization crystal growth kinetics DFT calculations
Xin Wang, Wei Cui, Bin Li, Xiaojie Zhang, Yongxin Zhang, Yaodong Huang
《化学科学与工程前沿(英文)》 2020年 第14卷 第6期 页码 1112-1121 doi: 10.1007/s11705-019-1865-5
关键词: supramolecular self-assembly organogel liquid crystal tartaric acid hydrogen bond
Novel casting processes for single-crystal turbine blades of superalloys
Dexin MA
《机械工程前沿(英文)》 2018年 第13卷 第1期 页码 3-16 doi: 10.1007/s11465-018-0475-0
This paper presents a brief review of the current casting techniques for single-crystal (SC) blades, as well as an analysis of the solidification process in complex turbine blades. A series of novel casting methods based on the Bridgman process were presented to illustrate the development in the production of SC blades from superalloys. The grain continuator and the heat conductor techniques were developed to remove geometry-related grain defects. In these techniques, the heat barrier that hinders lateral SC growth from the blade airfoil into the extremities of the platform is minimized. The parallel heating and cooling system was developed to achieve symmetric thermal conditions for SC solidification in blade clusters, thus considerably decreasing the negative shadow effect and its related defects in the current Bridgman process. The dipping and heaving technique, in which thin-shell molds are utilized, was developed to enable the establishment of a high temperature gradient for SC growth and the freckle-free solidification of superalloy castings. Moreover, by applying the targeted cooling and heating technique, a novel concept for the three-dimensional and precise control of SC growth, a proper thermal arrangement may be dynamically established for the microscopic control of SC growth in the critical areas of large industrial gas turbine blades.
关键词: superalloy investment casting Bridgman process directional solidification single crystal turbine blade
Polymorphism and crystal transformation of penicillin sulfoxide
Dingding JING, Yongli WANG, Zhijian CHEN, Lina ZHOU, Jingkang WANG
《化学科学与工程前沿(英文)》 2011年 第5卷 第4期 页码 442-447 doi: 10.1007/s11705-011-1140-x
关键词: penicillin sulfoxide crystallization polymorphism crystal transformation Raman spectroscopy
Biosorption and biotransformation of crystal violet by
Tao PAN, Suizhou REN, Jun GUO, Meiying XU, Guoping SUN
《环境科学与工程前沿(英文)》 2013年 第7卷 第2期 页码 185-190 doi: 10.1007/s11783-012-0435-6
关键词:
crystal violet
decolorization
biosorption
biotransformation
Computer modeling of crystal growth of silicon for solar cells
Lijun LIU, Xin LIU, Zaoyang LI, Koichi KAKIMOTO
《能源前沿(英文)》 2011年 第5卷 第3期 页码 305-312 doi: 10.1007/s11708-011-0155-9
Evaluation method of multiaxial low cycle fatigue life for cubic single crystal material
CHEN Jiping, DING Zhiping
《机械工程前沿(英文)》 2007年 第2卷 第3期 页码 278-282 doi: 10.1007/s11465-007-0048-0
关键词: orthotropic regression analysis crystal material multiaxial prediction
标题 作者 时间 类型 操作
Dynamic modulation performance of ferroelectric liquid crystal polarization rotators and Mueller matrix
Song ZHANG, Lelun WANG, Anze YI, Honggang GU, Xiuguo CHEN, Hao JIANG, Shiyuan LIU
期刊论文
Effect of polymer structures on electro-optical properties of polymer stabilized liquid crystal films
WANG Shoulian, HE Jie, ZENG Yu, YAN Bin, WANG Yinghan
期刊论文
Room temperature liquid metal: its melting point, dominating mechanism and applications
Junheng FU, Chenglin ZHANG, Tianying LIU, Jing LIU
期刊论文
基于5 μm厚向列相液晶的高效圆极化相控阵系统的设计、校准和实验验证
Xin Yu Wu,Fengshuo Wan,Hongyuan Feng,Shichao Jin,Chong Guo,Yu Wei,Dunge Liu,Yuqian Yang,Longzhu Cai,Zhi Hao Jiang,Wei Hong
期刊论文
Research progress on ultra-precision machining technologies for soft-brittle crystal materials
Hang GAO,Xu WANG,Dongming GUO,Yuchuan CHEN
期刊论文
Crystal-to-crystal transformation from the triclinic to the cubic crystal system by partial desolvation
Qianqian Guo, Irmgard Kalf, Ulli Englert
期刊论文
Effect of hierarchical ZSM-5 zeolite crystal size on diffusion and catalytic performance of n-heptane
Shuman Xu, Xiaoxiao Zhang, Dangguo Cheng, Fengqiu Chen, Xiaohong Ren
期刊论文
Theoretical insights into influence of additives on sulfamethoxazole crystal growth kinetics and mechanisms
期刊论文
Supramolecular self-assembly of two-component systems comprising aromatic amides/Schiff base and tartaric acid
Xin Wang, Wei Cui, Bin Li, Xiaojie Zhang, Yongxin Zhang, Yaodong Huang
期刊论文
Polymorphism and crystal transformation of penicillin sulfoxide
Dingding JING, Yongli WANG, Zhijian CHEN, Lina ZHOU, Jingkang WANG
期刊论文
Biosorption and biotransformation of crystal violet by
Tao PAN, Suizhou REN, Jun GUO, Meiying XU, Guoping SUN
期刊论文
Computer modeling of crystal growth of silicon for solar cells
Lijun LIU, Xin LIU, Zaoyang LI, Koichi KAKIMOTO
期刊论文