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628 results on '"Kang, Zhe"'

153. Advanced progress on χ(3) nonlinearity in chip-scale photonic platforms

Author

Kang, Zhe, Mei, Chao, Zhang, Luqi, Zhang, Zhichao, Evans, Julian, Cheng, Yunjun, Zhu, Kun, Zhang, Xianting, Huang, Dongmei, Li, Yuhua, He, Jijun, Wu, Qiang, Yan, Binbin, Wang, Kuiru, Zhou, Xian, Long, Keping, Li, Feng, Li, Qian, Wang, Shaokang, Yuan, Jinhui, Wai, Ping-Kong Alexander, and He, Sailing

Subjects
F300, H600
Abstract

χ(3) nonlinearity enables ultrafast femtosecond scale light-to-light coupling and manipulation of intensity, phase, and frequency. χ(3) nonlinear functionality in micro-and nano-scale photonic waveguides can potentially replace bulky fiber platforms for many applications. In this Review, we summarize and comment on the progress on χ(3) nonlinearity in chip-scale photonic platforms, including several focused hot topics such as broadband and coherent sources in the new bands, nonlinear pulse shaping, and all-optical signal processing. An outlook of challenges and prospects on this hot research field is given at the end.

Published
2021

154. Tunable Mid-Infrared Dispersive Wave Generation of High-Efficiency and Broadband in a Suspended Thin-Film Lithium-Niobate-on-Insulator Waveguide

Author

Jia, Jing, Kang, Zhe, He, Sailing, Jia, Jing, Kang, Zhe, and He, Sailing

Abstract

A suspended thin-film lithium-niobate-on-insulator nano-waveguide (NanoLN) is designed, and tunable mid-infrared dispersivewave generation of high-efficiency and broadband is numerically studied on this designed platform. By hollowing out the silicon dioxide substrate between the NanoLN core and silicon wafer, the loss issue induced by mode leaking at mid-infrared region is eliminated. The second zero-dispersion wavelength of the suspended NanoLN is tailored to locate around 2 mu m wavelength, so that mode-locked fiber laser pump sources in this waveband can be conveniently leveraged to generate dispersive wave beyond 3 mu mwavelength. We show that dispersive wave at 3.16 mu m with high conversion efficiency up to 36.26% and bandwidth (at 10 dB level) of similar to 471 nm can be achieved at the pump pulse energy of 0.23 nJ. The central wavelength of the dispersive wave can be flexibly tuned up to 5 mu m with a maximum 10 dB bandwidth of similar to 2 mu m by lithographic control of the waveguide geometry, which is naturally at the expense of degraded conversion efficiency. Our results show the suspended NanoLN can provide a versatile chip-scale platform for cost-effective mid-infrared targetable, broadband, and coherent sources generation. Using fiber laser pump sources gives the advantages of compactness, free-maintenance, and long-term stability, which suit field applications., QC 20210401

Published
2021
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164. Experimental Research of Diffusion Combustion and Emissions Characteristics Under Oxy-Fuel Combustion Mode

Author

Zhijun Wu, Jun Deng, Liguang Li, Zongjie Hu, and Kang Zhe

Subjects
Materials science, 020209 energy, Mechanical Engineering, Nuclear engineering, Diffusion flame, Mode (statistics), Energy Engineering and Power Technology, Aerospace Engineering, chemistry.chemical_element, 02 engineering and technology, Combustion, Oxygen, Experimental research, Oxy-fuel, 020303 mechanical engineering & transports, Fuel Technology, 0203 mechanical engineering, Nuclear Energy and Engineering, chemistry, 0202 electrical engineering, electronic engineering, information engineering
Abstract

Internal combustion Rankine cycle (ICRC) concept implements oxy-fuel combustion, direct water injection (DWI), and waster heat recovery (WHR) into traditional Otto or diesel cycle to realize high thermal efficiency and low emission powertrain. In order to support ICRC realization, this paper is dedicated to investigate the feasibility of implementing oxy-fuel combustion into diffusion combustion which provides fundamental information for future compression ignition (CI)-ICRC engine. The prototype oxy-fuel diffusion combustion engine test bench is established based on a retrofitted diesel engine, and the O2/CO2 mixture intake system, high-pressure common rail fuel injection system, and high-performance electronic controller are designed and installed within engine test bench to investigate the combustion and emission characteristics under different intake oxygen fractions (OF), fuel injection durations, and fuel injection timing. The optimum intake OF and fuel injection strategies are acquired within the selected experimental conditions, a 41.1% brake thermal efficiency (BTE), and 1.2% coefficient of variation (CoV) is achieved utilizing 55% intake OF, 0.7 ms fuel injection duration and 352 °CA (after exchange top dead center (TDC)) fuel injection timing. The oxy-fuel diffusion combustion proved to be a feasible solution for simultaneously reduction in NOX and particulate emissions, and NOX emissions lower than 90 × 10−6 with particulate matters (PM) around 0.1 filter smoke number (FSN) is observed during engine bench testing. The result of this study provides fundamental information for future CI-ICRC prototype engine establishment and optimization, which also could be utilized as reference guidance for potential industrialization of internal combustion engine (ICE) with oxy-fuel combustion mode.

Published
2020
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171. ADVANCED PROGRESS ON Χ(3) NONLINEARITY IN CHIP-SCALE PHOTONIC PLATFORMS (INVITED REVIEW)

Author

Kang, Zhe, primary, Mei, Chao, additional, Zhang, Luqi, additional, Zhang, Zhichao, additional, Evans, Julian, additional, Cheng, Yunjun, additional, Zhu, Kun, additional, Zhang, Xianting, additional, Huang, Dongmei, additional, Li, Yuhua, additional, He, Jijun, additional, Wu, Qiang, additional, Yan, Binbin, additional, Wang, Kuiru, additional, Zhou, Xian, additional, Long, Keping, additional, Li, Feng, additional, Li, Qian, additional, Wang, Shaokang, additional, Yuan, Jinhui, additional, Wai, Ping-Kong Alexander, additional, and He, Sailing, additional

Published
2021
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172. 空间目标多种光谱观测方法的应用研究

Author

Deng Shiyu, 邓诗宇, primary, Liu Chengzhi, 刘承志, additional, Tan Yong, 谭勇, additional, Liu Delong, 刘德龙, additional, Jiang Chunxu, 姜春旭, additional, Kang Zhe, 康喆, additional, Li Zhenwei, 李振伟, additional, Fun Cunbo, 范存波, additional, Zhu Chengwei, 朱成伟, additional, Zhang Nan, 张楠, additional, Chen Long, 陈龙, additional, Niu Bingli, 牛炳力, additional, and Lü Zhong, 吕众, additional

Published
2021
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179. Correction: Chen et al. A New Triangulation Algorithm for Positioning Space Debris. Remote Sens. 2021, 13 , 4878.

Author

Chen, Long, Liu, Chengzhi, Li, Zhenwei, and Kang, Zhe

Subjects
SPACE debris, ALGORITHMS, TRIANGULATION
Abstract

In order to obtain the expressions of RMS position error, we have to derive the expressions of HT RM ht and HT RN ht . Similarly, HT d B ht , HT d B ht are the LOS vector errors in the topocentric coordinate systems. The actual position of space debris is denoted by T. HT d A ht and HT d A ht are the LOS vector errors in the topocentric coordinate systems. [Extracted from the article]

Published
2023
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182. Multi-responsive fluorescent sensor based on Cu(II) coordination polymer for selective detection of acetylacetone and Cr(VI) ions

Author

Shao-Dan Wang, Yan-Ning Wang, Guo-Dong Zou, and Kang-Zhe Cao

Subjects
Denticity, Aqueous solution, 010405 organic chemistry, Coordination polymer, Acetylacetone, Metal ions in aqueous solution, 010402 general chemistry, 01 natural sciences, Fluorescence, Tricarboxylate, 0104 chemical sciences, Inorganic Chemistry, chemistry.chemical_compound, chemistry, Polymer chemistry, Materials Chemistry, Molecule, Physical and Theoretical Chemistry
Abstract

A novel Cu(II) coordination polymer [Cu(HL)(4,4′-bpy)]n (4,4′-bpy = 4,4′-bipyridine) 1 based on a semi-rigid tricarboxylate, 5-(3,4-dicarboxylphenoxy) nicotinic acid (H3L) has been hydrothermally synthesized. Single-crystal X-ray diffraction analysis indicates that, in compound 1, H3L ligands first extend the metal ions into a 2-D layer. Then the 4,4′-bpy molecules functioned as bidentate bridge, strutting the 2-D layers into a 3-D open network with a (63) (69·8) topology. Notably, 1-D channels of ca. 6.5 × 10.5 A2 are observed in 1, but due to 2-fold interpenetration phenomenon, these channels become small or disappear. Fluorescent spectra indicate 1 can act as a muti-chemosensor for detection of acetylacetone (Hacac), Cr2O72− and CrO42− in aqueous solution with high selectivity and sensitivity. The mechanism of luminescent sensing Hacac and Cr(VI) were also investigated in detail.

Published
2021
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183. Crystal Growth and Optimization of Cs 2 LiLaBr 6 Scintillator via the Cs 2 LaBr 5 -LiBr Phase Diagram Construction.

Author

Zhang, Xianggang, Cai, Zhuochen, Kang, Zhe, Zhai, Huiwen, Yin, Ziang, Jie, Wanqi, and Wang, Tao

Subjects
CRYSTAL growth, SCINTILLATORS, NEUTRON counters, X-ray powder diffraction, DIFFERENTIAL scanning calorimetry, NUCLEAR energy, PHASE diagrams
Abstract

Gamma/neutron dual detection has occupied significant territory in the field of homeland security and nuclear energy development. Cs2LiLaBr6 (CLLB) has shown both neutron/gamma dual-mode detection capability and excellent scintillation properties. Herein, we explored the Cs2LaBr5-LiBr phase diagram through powder X-ray diffraction (XRD) and differential scanning calorimetry (DSC) tests of synthesized polycrystalline materials. The Cs2LaBr5-rich side of the phase diagram is similar to a binary peritectic phase diagram, where the peritectic line (447 °C) extends to a LiBr content of 61%. The LiBr-rich side of the phase diagram resembles a binary eutectic phase diagram, where the eutectic point (395 °C) is located at 80% LiBr concentration. Guided by the phase diagram, CLLB ingots were designed to grow from the LiBr-rich side with different concentrations of LiBr. The scintillator properties of CLLB crystals were found to be deteriorated by the increasing defects with elevated LiBr contents. A concentration of LiBr around 55% was a preference for the growth of high-quality CLLB. A better understanding of the Cs2LaBr5-LiBr phase diagram benefits the growth of CLLB crystals and provides considerations for other halide double perovskites. [ABSTRACT FROM AUTHOR]

Published
2022
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185. A dual-functional fluorescent Co(II) coordination polymer sensor for the selective sensing of ascorbic acid and acetylacetone

Author

Guo-Dong Zou, Yan-Ning Wang, Kang-Zhe Cao, and Shao-Dan Wang

Subjects
Aqueous solution, Coordination polymer, General Chemical Engineering, Acetylacetone, Supramolecular chemistry, General Physics and Astronomy, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Ascorbic acid, 01 natural sciences, Fluorescence, 0104 chemical sciences, Ion, chemistry.chemical_compound, chemistry, Propane, Polymer chemistry, 0210 nano-technology
Abstract

A new coordination polymer (CP), [Co(μ3-HL)(μ-bpp)(H2O)]n 1 (H3L = 5-(3,4-dicarboxylphenoxy) nicotinic acid, bpp = 1,2-bis (4-pyridyl) propane)) has been successfully prepared under solvothermal conditions. Single-crystal X-ray diffraction analysis demonstrates that compound 1 possesses a 2-D layer structure with (3-c)(4-c) 2-nodal (42ˑ63ˑ8) (42ˑ6) topology, which then self-assembles into a final 3-D supramolecular network via the interlayer π⋯π interactions. Magnetic studies indicate that there exist weak-anti-ferromagnetic exchange interactions between CoII ions. More importantly, compound 1 represents a rare example of a fluorescent CP sensor which can dually probe ascorbic acid (AA) and acetylacetone (acac) in aqueous solution. The probable sensing mechanism of both analytes has also been discussed in this paper.

Published
2021
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