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A novel reprocessable chloroprene rubber based on dynamic disulfide metathesis

International Journal of Smart and Nano Materials 2024年第1期15卷 42-61页

作者： jianliang jiang Junxue Zhai Yanqing Chen Dongqi Zhao Yakai Feng School of Chemical Engineering and Technology Collaborative Innovation Center of Chemical Science and Chemical Engineering(Tianjin)Tianjin UniversityTianjinChina R&D Department of China(Yangzhou) Material Handling Tech-Engineering LtdYangzhouChina Key Laboratory of Rubber Plastics of Ministry of Education/Shandong Province (QUsT)School of Polymer Science&EngineeringQingdao University of Science&TechnologyQingdaoChina R&D Department of Tianjin Joaboa Technology Co.Ltd TianjinP.R.China Frontiers Science Center for Synthetic Biology Tianjin UniversityTianjinChina Key Laboratory of Systems Bioengineering(Ministry of Education) Tianjin UniversityTianjinChina

For sustainable application of chloroprene rubber(CR),a new technology is developed by the vulcanization of CR using 2,2'-dithiodipyridine(DPD)as a cross-linking agent with the repro-cessing performance owing to disulfde *** DPD was incorporated into CR vulcanization,the Menschutkin reac-tion between allyl chloride group and pyridine group occurred with a maximum exothermic peak at 184°*** number of effective cross-linking bond at o.5 phr DPD vulcanizate was higher than that at high DPD *** vulcanizate showed high tensile strength(11.12 MPa)and elongation at break(1253±120%)owing to the exchangeable disulfide bond in the *** the catalysis of triphenylphosphine,the metathesis of disulfide compound was improved obviously,which endowed CR/DPD vulcanizates with good recyclability *** cross-linkage maintains its stability at low temperature,thus ensuring the mechanical stability of CR/DPD vulcanizate under the ambient *** and reprocessing of CR/DPD vulcanizate can be conducted with common industrial rubber processing *** reprocessable chloroprene rubber could have potential appli-cation in CR industry,also serve to significantly improve envir-onmental sustainability.

关键词： Chloroprene rubber reprocessable Menschutkin reaction disulfide

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船舶应用燃料电池系统的设计与试验

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化工进展 2024年第5期43卷 2554-2567页

作者：张宝王鹏安勇攀吕平蒋建良新源动力股份有限公司辽宁大连116085

受到航海运输领域的新政策和严格的排放法规限制,船舶应用燃料电池受到越来越多的关注与重视,尤其是具有高效率、低噪声、模块化的质子交换膜燃料电池(PEMFC)系统。本文介绍了由新源动力股份有限公司开发的船用PEMFC系统,以隔离防护和... 详细信息

受到航海运输领域的新政策和严格的排放法规限制,船舶应用燃料电池受到越来越多的关注与重视,尤其是具有高效率、低噪声、模块化的质子交换膜燃料电池(PEMFC)系统。本文介绍了由新源动力股份有限公司开发的船用PEMFC系统,以隔离防护和泄露探测为基准要求,该PEMFC系统配置了多个安全参数检测装置,对于BOP部件选型采用了针对性的方案,通过水热管理优化及标定,系统额定效率和峰值效率分别为45%和62%。为了证明PEMFC系统满足功能完善及安全可靠的要求,采用设计试验的方法研究并制定了性能评价试验,分别是可靠性试验、低温启动试验及双机并联试验。试验结果表明:经历了200h动态工况测试后系统在中间功率下性能无变化,在额定功率下电堆性能衰减率为1.2%;基于良好的水热管理及多模式控制手段,实现了吹扫时间和单体电压偏差大幅降低,当环境温度为-30℃时顺利实现低温启动,高于船用规范中的最苛刻要求;在高功率需求及冗余设计目标下,双机并联使得系统总成动力输出更平稳、可靠,而且通过交替启动策略提高了系统耐久性,不同的工作模式为系统维护及故障处理提供了基础条件;PEMFC系统具备搭载实船应用的能力。本文为船用PEMFC系统的设计和开发提供了参考依据。

关键词：船用燃料电池设计质子交换膜燃料电池系统水热管理优化可靠性

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光斑形状对BBO晶体四倍频效率的影响

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光学技术 2024年第3期50卷 305-308页

作者：孟诗涵臧天元蒋剑良张恒利北京理工大学光电学院固体激光实验室北京100081

BBO晶体是一种被广泛应用于激光倍频、混频、光参量振荡等光学领域的非线性频率变换晶体。但是由于该晶体在四倍频过程中具有较大的走离角,会使产生的倍频光与基频光逐渐分开,降低了四倍频转换效率。文章模拟了在532~266nm倍频过程中,... 详细信息

BBO晶体是一种被广泛应用于激光倍频、混频、光参量振荡等光学领域的非线性频率变换晶体。但是由于该晶体在四倍频过程中具有较大的走离角,会使产生的倍频光与基频光逐渐分开,降低了四倍频转换效率。文章模拟了在532~266nm倍频过程中,入射光斑形状为圆形和矩形时对BBO晶体四倍频效率的影响。计算结果表明,采用矩形光斑入射到BBO晶体表面可以延长有效倍频孔径长度,减小走离效应对倍频光的影响,明显提升四倍频效率。

关键词：矩形光斑走离效应紫外激光非线性光学四倍频

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Reflectometric and interferometric fiber optic sensor's principles and applications

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Frontiers of Optoelectronics 2019年第2期12卷 215-226页

作者： Muhammad Noaman ZAHID jianliang jiang Saad RIZVI School of Optics and Photonics Beijing Institute of TechnologyBeijing 100081China

Fiber optic sensors have been widely used and studied in recent times. This paper presents operating principles and applications of fiber optic sensors namely reflectometric and interferometric fiber optic sensors. Majority of optical fiber sensors fall under these two broad categories. Both interferometric and reflectometric fiber optic sensors are becoming popular for their ease of use, flexibility, long distance sensing, and potentially noise free detection. Also, these sensors can easily be used in various applications such as structural health monitoring, perimeter intrusion detection, temperature monitoring, and other numerous applications. This paper broadly classifies fiber optic sensors into two subtypes. The paper further highlights different sensors based on their sensing resolution, range, spatial advantages, and applications.

关键词： fiber optic reflectometric interferometric optical fiber sensors sensor applications

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A Comparison on the Localization Performance of Static and Dynamic Binaural Ambisonics Reproduction with Different Order

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Sound & Vibration 2019年第1期53卷 25-36页

作者： jianliang jiang Bosun Xie Haiming Mai Acoustic Lab School of Physics and OptoeletronicsSouth China University of TechnologyGuangzhou510641China State Key Laboratory of Subtropical Building Science South China University of TechnologyGuangzhou510641China

Ambisonics is a series of spatial sound reproduction system based on spatial harmonics decomposition and each order approximation of sound *** signals are originally intended for loudspeakers *** using head-related transfer functions(HRTFs)filters,binaural Ambisonics converts the Ambisonics signals for static or dynamic headphone *** present work,the performances of static and dynamic binaural Ambisonics reproduction are evaluated and *** mean binaural pressure errors across target source directions are first *** a virtual source localization experiment is conducted,and the localization performances are evaluated by analyzing the percentages of front-back and up-down confusion,the mean angle error and discreteness in the localization *** results indicate that binaural Ambsonics reproduction with insufficiently high order(for example,5-10 order)is unable to recreate correct high-frequency magnitude spectra in binaural pressures,resulting in degradation in localization for static *** dynamic localization cue is included,dynamic binaural Ambisoncis reproduction yields obviously better localization performance than static reproduction with the same *** a 3-order dynamic binaural Ambisoncis reproduction exhibits appropriate localizations performance.

关键词： Binaural Ambisonics localization dynamic spatial sound loudspeakers

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Influence of the Number of Loudspeakers on the Timbre in Horizontal and Mixed-Order Ambisoncis Reproduction

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Sound & Vibration 2019年第3期53卷 97-109页

作者： Haiming Mai Bosun Xie jianliang jiang Dan Rao Yang Liu Acoustic Laboratory School of Physics and OptoeletronicsSouth China University of TechnologyGuangzhouChina State Key Laboratory of Subtropical Building Science South China University of TechnologyGuangzhouChina

Ambisonics is a series of flexible spatial sound reproduction systems based on spatial harmonics decomposition of sound *** horizontal and spatial Ambisonics reconstruct horizontal and spatial sound field with certain order of spatial harmonics,*** the Shannon-Nyquist spatial sampling frequency limit for accurately reconstructing sound field and the complexity of system increase with the increasing order of *** on the fact that the horizontal localization resolution of human hearing is higher than vertical resolution,mixed-order Ambisonics(MOA)reconstructs horizontal sound field with higher order spatial harmonics,while reconstructs vertical sound field with lower order spatial harmonics,and thereby reaches a compromise between the perceptual performance and the complexity of *** a given order horizontal Ambisoncis or MOA reproduction,the number of horizontal loudspeakers is flexible,providing that it exceeds some low *** using Moore’s revised loudness model,the present work analyzes the influence of the number of horizontal loudspeakers on timbre both in horizontal Ambisonics and MOA *** binaural loudness level spectra(BLLS)of Ambisoncis reproduction are calculated and then compared with those of target sound *** results indicate that below the Shannon-Nyquist limit of spatial sampling,increasing the number of horizontal loudspeakers influence little on BLLS then *** the limit,however,the BLLS for Ambisoncis reproduction deviate from those of target sound *** extent of deviation depends on both the direction of target sound field and the number of *** the number of horizontal loudspeakers may increase the change of BLLS then timbre in some cases,but reduce the change in some other *** MOA,the influence of the number of horizontal loudspeakers on BLLS and timbre reduces when virtual source departs from horizontal plane to the high or low *** sub

关键词： Ambisonics loudspeaker timbre loudness

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Recycling of waste aluminum scraps to fabricate sulfidated zero-valent iron-aluminum particles for enhanced chromate removal

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Journal of Environmental Sciences 2024年第4期138卷 650-659页

作者： Yahui Zhang Liguo Zhang Jiajia Zeng Shuqun Xu Jianyu Pan Wenzhuo Huang jianliang Sun Feng jiang Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety&MOE Key Laboratory of Theoretical Chemistry of Environment School of EnvironmentSouth China Normal UniversityGuangzhou 510006China Guangdong Provincial Key Lab of Environmental Pollution Control and Remediation Technology School of Environmental Science&EngineeringSun Yat-Sen UniversityGuangzhou 510275China

Massive waste aluminum scraps produced from the spent aluminum products have high electron capacity and can be recycled as an attractive alternative to materials based on zerovalent iron(Fe^(0))for the removal of oxidative contaminants from *** study thus proposed an approach to fabricate micron-sized sulfidated zero-valent iron-aluminum particles(S-Al^(0)@Fe^(0))with high reactivity,electron selectivity and capacity using recycled waste aluminum scraps.S-Al^(0)@Fe^(0)with a three-layer structure contained zero-valent aluminum(Al^(0))core,Fe^(0) middle layer and iron sulfide(FeS)*** rates of chromate(Cr(Ⅵ))removal by S-Al^(0)@Fe^(0)at pH 5.0-9.0 were 1.6-5.9 times greater than that by sulfidated zero-valent iron(S-Fe^(0)).The Cr(Ⅵ)removal capacity of S-Al^(0)@Fe^(0)was 8.2-,11.3-and 46.9-fold greater than those of S-Fe0,zero-valent iron-aluminum(Al^(0)-Fe^(0))and Fe^(0),*** chemical cost of S-Al^(0)@Fe^(0) for the equivalent Cr(Ⅵ)removal was 78.5%lower than that of S-Fe^(0).Negligible release of soluble aluminum during the Cr(Ⅵ)removal was *** significant enhancement in the reactivity and capacity of S-Al^(0)@Fe^(0)was partially ascribed to the higher reactivity and electron density of the Al0core than Fe^(0).More importantly,S-Al^(0)@Fe^(0) served as an electric cell to harness the persistent and selective electron transfer from the Al^(0)-Fe^(0) core to Cr(Ⅵ)at the surface via coupling Fe^(0)-Fe^(2+)-Fe^(3+)redox cycles,resulting in a higher electron utilization ***,S-Al^(0)@Fe^(0) fabricated using recycled waste aluminum scraps can be a cost-effective and environmentally-friendly alternative to S-Fe^(0) for the enhanced removal of oxidative contaminants in industrial wastewater.

关键词： Recycled waste aluminum scraps Oxidative contaminants Cr(Ⅵ)reduction Sulfidated Al^(0)@Fe^(0)particle Electron transfer

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混合阶Ambisonics重放的分析与实验验证

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华南理工大学学报（自然科学版） 2018年第3期46卷 108-118页

作者：麦海明谢菠荪江建亮华南理工大学物理与光电学院∥声学研究所广东广州510640 华南理工大学亚热带建筑科学重点实验室广东广州510640

Ambisonics是一系列基于声场的空间谐波分解和各阶近似的空间声系统,其重放声场方向信息的精确度与系统的复杂程度均随阶数的增加而增加.由于听觉系统对水平面空间信息的分辨率较垂直方向高,混合阶Ambisonics采用较高阶的空间谐波重构... 详细信息

Ambisonics是一系列基于声场的空间谐波分解和各阶近似的空间声系统,其重放声场方向信息的精确度与系统的复杂程度均随阶数的增加而增加.由于听觉系统对水平面空间信息的分辨率较垂直方向高,混合阶Ambisonics采用较高阶的空间谐波重构水平面方向声场,而用较低阶的空间谐波重构垂直方向声场,以实现感知性能与系统复杂性的折中.文中以28+1分层式扬声器布置为例,对混合阶Ambisonics重放的双耳重构声压进行分析,并和传统的高阶Ambisonics重放及目标声源的情况进行比较,同时进行了虚拟源定位实验验证.分析和实验结果表明,对实际中可实现的扬声器数目与布置,与传统的高阶Ambisonics相比,合理设计的混合阶Ambisonics在保持非水平方向目标声源重放性能的同时,可改善水平面目标声源的重放性能.

关键词： Ambisonics 混合阶定位扬声器重放

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LD End-Pumped Nd:YAG InnoSlab Laser at 1319 nm

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Optics and Photonics Journal 2023年第5期13卷 79-85页

作者： Tianyuan Zang Shihan Meng Lei Liu Wentao Wang jianliang jiang Hengli Zhang School of Optoelectronics Beijing Institute of Technology Beijing China Science and Technology on Solid-State Laser Laboratory North China Research Institute of Electro-Optics Beijing China

The 1319 nm lasers have important research value and application prospects in optical communications, biomedicine and nonlinear frequency conversion. Currently, there are few reports of high power 1319 nm continuous lasers with high beam quality. We have demonstrated a high output power, high beam quality 1319 nm continuous-wave laser by laser diode end-pumped Nd:YAG slab with a stable-unstable hybrid resonator. With a pumping power of 477 W, an output of 96.8 W was obtained with a slope efficiency of 26.5% and stability of 0.27%. A single wavelength laser operation at 1318.7 nm was demonstrated. At an output of 91.1 W, the beam quality factors M2 in stable and unstable directions were 2.95 and 1.88, respectively.

关键词： InnoSlab 1319 nm Nd:YAG Hybrid Resonator

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重放自由场虚拟源距离信息的动态双耳Ambisonics方法

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声学学报 2021年第6期46卷 1223-1233页

作者：谢菠荪刘路路江建亮华南理工大学物理与光电学院声学研究所广州510641 华南理工大学亚热带建筑科学国家重点实验室广州510641

双耳重放的目标之一是在耳机重放中产生不同方向和距离的虚拟源感知。本文研究了动态双耳Ambisonics重放自由场虚拟源方向和距离信息的简化信号处理方法。该信号处理方法包括两步:第1步是基于目标声场的球谐函数分解,合成采用扬声器的近... 详细信息

双耳重放的目标之一是在耳机重放中产生不同方向和距离的虚拟源感知。本文研究了动态双耳Ambisonics重放自由场虚拟源方向和距离信息的简化信号处理方法。该信号处理方法包括两步:第1步是基于目标声场的球谐函数分解,合成采用扬声器的近场Ambisonics重放中逐级重构目标声场的信号;第2步是采用虚拟扬声器重放的方法,用动态头相关函数滤波处理将Ambisonics的扬声器重放信号转换为双耳重放信号并用耳机重放。进一步研究了动态双耳Ambisonics的阶数对定位效果的影响,为简化信号处理提供依据。对重放产生的双耳声压分析表明,5阶动态双耳Ambisonics重放足以提供听觉方向定位和距离感知的重要信息。同时心理声学的实验结果表明,结合声源距离相关的响度因素,5阶动态双耳Ambisonics重放可产生不同方向和1.0 m以下不同近场距离的自由场虚拟源的听觉感知。本文的方法仅需要固定距离的48个均匀空间方向的远场非个性化HRTF处理,实现了信号处理的简化。

关键词：听觉感知心理声学相关函数自由场距离信息方向定位响度球谐函数

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