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Nano Research 2018年第4期11卷 2149-2158页

作者： jiahao yu Gongzhen Cheng Wei Luo College of Chemistry andMolecularSciences Wuhan University Wuhan 430072 China Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University Tianjin 300071 China

The development of efficient and stable non-noble metal-based electrocatalysts for the oxygen evolution reaction （OER） is one of the essential challenges for the upcoming hydrogen economy. Herein, three-dimensional （3D） mesoporous nickel iron selenide with rose-like microsphere architecture was directly grown on Ni foam via a successive two-step hydrotherrnal method. The unique 3D mesoporous rose-like morphology leads to a higher number of active sites as well as fast mass and electron transport through the entire electrode, and facilitates the release of 02 bubbles formed during the OER catalysis. As a result, the synthesized Ni0.76Fe0.24Se exhibits superior OER performances, with an ultralow overpotential of 197 mV needed to produce a current density of 10 ***-2 in 1 M KOH, outperforming all transition metal selenide OER catalysts reported to date.

关键词： transition metal selenide oxygen evolution reaction NiFeSe three-dimensional (3D) rose-like microspheres

Optical properties and applications of two-dimensional CdSe nanoplatelets

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InfoMat 2020年第5期2卷 905-927页

作者： jiahao yu Rui Chen Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhenGuangdongChina Harbin Institute of Technology HarbinChina

Compared with zero-dimensional quantum dots and one-dimensional nanorods,two-dimensional nanoplatelets exhibit many unique optical *** to strong quantum confinement in only one direction and the large lateral size,the CdSe nanoplatelets show large exciton binding energy,giant oscillator strength,narrow emission,large absorption cross-section,and large optical *** this review,the development of synthesis technology of nanoplatelets is first briefly ***,the optical properties of CdSe nanoplatelets and their heterostructures are reviewed,including absorption and photoluminescence,carrier dynamics,optical gain,and nonlinear *** optical properties are affected by size,material and *** last,the main applications of CdSe nanoplatelets in recent years are introduced,including light-emitting diodes,lasers,light harvesting,photocatalysis,and sensing.

关键词： CdSe nanoplatelets optical property semiconductor nanocrystal two-dimensional material

An improved bidirectional generative adversarial network model for multivariate estimation of correlated and imbalanced tunnel construction parameters

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第7期15卷 1797-1809页

作者： Yao Xiao Jia yu Guoxin Xu Dawei Tong jiahao yu Tuocheng Zeng State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin300072China Hanjiang to Weihe River Valley Water Diversion Project Construction Co. Ltd.Xi’an710024China

Estimation of construction parameters is crucial for optimizing tunnel construction *** to the influence of routine activities and occasional risk events,these parameters are usually correlated and *** solve this issue,an improved bidirectional generative adversarial network(BiGAN)model with a joint discriminator structure and zero-centered gradient penalty(0-GP)is *** this model,in order to improve the capability of original BiGAN in learning imbalanced parameters,the joint discriminator separately discriminates the routine activities and risk event durations to balance their influence ***,the self-attention mechanism is embedded so that the discriminator can pay more attention to the imbalanced ***,the 0-GP is adapted for the loss of the discrimi-nator to improve its convergence and stability.A case study of a tunnel in China shows that the improved BiGAN can obtain parameter estimates consistent with the classical Gauss mixture model,without the need of tedious and complex correlation *** proposed joint discriminator can increase the ability of BiGAN in estimating imbalanced construction parameters,and the 0-GP can ensure the stability and convergence of the model.

关键词： Multivariate parameters estimation Correlated and imbalanced parameters Bidirectional generative adversarial network(BiGAN) Joint discriminator Zero-centered gradient penalty(0-GP)

High-sensitivity intelligent packaging films harnessing rose anthocyanins and hydrophilic silica aerogel for visual food freshness monitoring

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Food Quality and Safety 2024年第1期8卷 179-189页

作者： Wenjun Wu Luman Zheng jiahao yu Liming Liu Gulden Goksen Ping Shao Department of Food Science and Technology Zhejiang University of TechnologyZhejiangHangzhouChina Department of Food Technology Vocational School of Technical Sciences at Mersin Tarsus Organized Industrial ZoneTarsus UniversityMersinTurkey Eco-Industrial Innovation Institute ZJUT Zhejiang University of TechnologyZhejiangQuzhouChina

The enhancement of the sensitivity for anthocyanin-based indicator films in food freshness monitoring in real time is important for *** this study,hydrophilic silica aerogel(SiO2 NA)was incorporated into corn starch(CS)/chitosan(CH)/rose anthocyanins(RACNs)-encapsulated potato amylopectin nanoparticles(APNPs)composite film to increase the sensitivity for shrimp freshness *** microstructure of films revealed that the gas absorption capacity was improved by amorphous SiO2 NA via hydrogen *** pore size(1.74–5.60 times),pore volume(3.92–5.60 times),and specific surface area(2.21–2.34 times)of films increased with the addition of SiO2 *** sensing of NH3 and pH and the reversibility of films were also ***,the pH-responsive films containing SiO2 NA changed visibly in color from purple–red to orange–gray and finally to gray,enabling effective monitoring of shrimp freshness during storage at 4°***,anthocyanin-based indicator films with improved sensitivity by adding SiO2 NA were successfully designed for monitoring shrimp freshness.

关键词： Hydrophilic silica aerogel anthocyanins sensitivity pH-responsive shrimp freshness intelligent packaging

A button switch inspired duplex hydrogel sensor based on both triboelectric and piezoresistive effects for detecting dynamic and static pressure

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Nanotechnology and Precision Engineering 2022年第2期5卷 12-20页

作者： Zhensheng Chen jiahao yu Xiaoxi Zhang Haozhe Zeng yunjia Li Jin Wu Kai Tao Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace Northwestern Polytechnical UniversityXi’an 710072China AVIC Xi’an Aircraft Industry Group Company Ltd. Xi’an 710089China School of Electrical Engineering Xi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of Optoelectronic Materials and Technologies and the Guangdong Province Key Laboratory of Display Material and Technology School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China

The capability to sense complex pressure variations comprehensively is vital for wearable electronics and flexible human–machine *** this paper,inspired by button switches,a duplex tactile sensor based on the combination of triboelectric and piezoresistive effects is designed and *** of its excellent mechanical strength and electrical stability,a double-networked ionic hydrogel is used as both the conductive electrode and elastic current *** addition,micro-pyramidal patterned polydimethylsiloxane(PDMS)acts as both the friction layer and the encapsulation elastomer,thereby boosting the triboelectric output performance *** duplex hydrogel sensor demonstrates comprehensive sensing ability in detecting the whole stimulation process including the dynamic and static *** dynamic stress intensity(10–300 Pa),the action time,and the static variations(increase and decrease)of the pressure can be identified precisely from the dual-channel *** with a signal processing module,an intelligent visible door lamp is achieved for monitoring the entire“contact–hold–release–separation”state of the external stimulation,which shows great application potential for future smart robot e-skin and flexible electronics.

关键词： Duplex hydrogel sensor Triboelectric nanogenerator Piezoresistive sensor Dynamic and static sensing

High-Performance Blue Quasi-2D Perovskite Light-Emitting Diodes via Balanced Carrier Confinement and Transfer

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Nano-Micro Letters 2022年第4期14卷 207-221页

作者： Zhenwei Ren Jiayun Sun jiahao yu Xiangtian Xiao Zhaojin Wang Ruijia Zhang Kai Wang Rui Chen yu Chen Wallace C.H.Choy Department of Electrical and Electronic Engineering The University of Hong KongPokfulam RoadHong KongPeople’s Republic of China Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China School of Optoelectronic Science and Engineering Soochow UniversitySuzhou 215006People’s Republic of China Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices Shenzhen 518055People’s Republic of China

Extensive investigation of the passivating agents has been performed to suppress the perovskite ***,very few attentions have been paid to rationally design the passivating agents for the balance of the carrier confinement and transfer in quasi-2D perovskites,which is essential to achieve high-performance perovskite LEDs(PeLEDs).In this work,tributylphosphine oxide(TBPO)with moderate carbon chain length is demonstrated as a decent passivator for the quasi-2D perovskites by strengthening the carrier confinement for massive radiative recombination within the perovskites,and more importantly providing efficient carrier transfer in the quasi-2D *** from these interesting optoelectronic properties of TBPO-incorporated perovskites,we achieve high-efficient blue PeLEDs with an external quantum efficiency up to 11.5%and operational stability as long as 41.1 min without any shift of the electroluminescence ***,this work contributes an effective approach to promote the carrier confinement and transfer for high-performance and stable blue PeLEDs.

关键词： Blue perovskite LEDs Carrier confinement and transfer Defect passivation 2-Dimentional

Study on Optimization of Passenger Flow at a Metro Station Based on AnyLogic-Case Study of Youfangqiao Station of Nanjing Metro Line 2

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Complex System Modeling and Simulation 2021年第3期1卷 242-252页

作者： Weihong Ni jiahao yu Hong Cai Meimei Bai Bin Wu the School of Economics and Management Nanjing Tech UniversityNanjing 211800China the Nanjing Metro Operation Co. Ltd.Nanjing 210000China

In this study,simulation software AnyLogic was used to establish a station simulation model for a metro ***,a basic model of the environment of the metro station was drawn,and accordingly,reasonable assumptions and simplifications were ***,a diagram of the passenger walking path was created and the simulation variables and functions for passenger flow management were *** Youfangqiao Station of Nanjing Metro Line 2 in China as an example,the real passenger flow data of this station were statistically *** simulate the station passenger flow management,input parameters such as the passenger space diameter,passenger flow generation rate,delay rate of automatic fare collection equipment and security check machine,and the number of gates were *** flow management was optimized for the morning and evening peak periods,and reasonable suggestions were proposed based on the optimization results,providing a theoretical basis for the construction planning and pre-evaluation of station operation capacities of urban rail transit systems.

关键词： metro passenger flow management pedestrian AnyLogic

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振动俘能技术在可穿戴领域的应用

机械工程学报 2022年第20期58卷 46-71页

作者：于家豪陶凯西北工业大学机电学院西安710072

能源问题日渐严峻,发展环保、便捷、可持续的能源技术是当务之急。相较于太阳能、热梯度、射频等环境能量,振动能量在人体运动及周围环境中具有广泛存在性,振动俘能技术也因此越来越受到人们的广泛关注。当前,可穿戴设备的发展受续航能... 详细信息

能源问题日渐严峻,发展环保、便捷、可持续的能源技术是当务之急。相较于太阳能、热梯度、射频等环境能量,振动能量在人体运动及周围环境中具有广泛存在性,振动俘能技术也因此越来越受到人们的广泛关注。当前,可穿戴设备的发展受续航能力限制,而传统电池存在着较多弊端与风险,收集人体运动的能量来为可穿戴电子设备供电也成为当前研究的热点。简要介绍电磁、静电、压电、摩擦电振动能量收集器的基本工作原理,并详细综述它们在可穿戴/可植入领域的研究进展,以及在人体各部位振动俘能的应用案例,对比阐述不同俘能机理的特点,最后对四种振动能量收集器在可穿戴领域所面临的输出性能、长期稳定性、穿戴舒适性等挑战进行总结并由此展望了其未来的发展趋势。

关键词：振动俘能可穿戴设备电磁静电压电摩擦电

Optical characteristics of self-trapped excitons in 2D (iso-BA)_(2)PbI_(4) perovskite crystals

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Photonics Research 2022年第2期10卷 594-600页

作者： Haolin Li Xuanyu Zhang Haizhen Wang jiahao yu Kexue Li Zhipeng Wei Dehui Li Rui Chen State Key Laboratory of High Power Semiconductor Laser School of ScienceChangchun University of Science and TechnologyChangchun 130022China Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

Organic–inorganic halide metal perovskites are an exciting class of two-dimensional(2D) materials that have sparked renewed interest for next-generation optoelectronics. In particular, the self-trapped excitons(STEs)in 2D perovskite with excellent optical properties suggest great potential in display and narrowband detection.A prerequisite of understanding STEs’ properties is correct identification of the underlying interaction that leads to STEs. Here, the optical properties of STEs in(iso-BA)_(2)PbI_(4) are characterized through laser spectroscopy at various temperatures and excitation intensities. It is found that STEs are related to the octahedral distortion caused by strong electron–phonon interaction. Trapping and detrapping between STEs and free excitons(FEs) are clearly observed. With the increase in temperature, STEs and FEs will gain enough energy and migrate to each other. Moreover, by characterizing the thickness-dependent and two-photon excitation emission, it is confirmed that STEs exist inside the material because of their weak absorption. Our findings are of great significance for not only the fundamental understanding of STEs, but also the design and optimization of 2D-perovskite-based electronic and optoelectronic devices.

关键词： interaction perovskite excitation

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非对称制动压力对汽车低频制动尖叫的影响

振动与冲击 2022年第2期41卷 297-304页

作者：吴奕东陈晶艳余家皓广州汽车集团股份有限公司汽车工程研究院广州511434

针对汽车制动尖叫问题,建立汽车制动器有限元模型并基于能量馈入法开展其非对称性和对称性制动压力下的复模态数值仿真。结果表明,耦合子系统的相对馈入能量能直接反映出各子部件的振型情况,当整体系统相对馈入能量的值接近0时,对应频... 详细信息

针对汽车制动尖叫问题,建立汽车制动器有限元模型并基于能量馈入法开展其非对称性和对称性制动压力下的复模态数值仿真。结果表明,耦合子系统的相对馈入能量能直接反映出各子部件的振型情况,当整体系统相对馈入能量的值接近0时,对应频率的复模态就无法被激发。对称性压力能够有效地降低活塞-卡钳的相对馈入能量,使制动器的复模态振型以制动盘更高阶的面外振动为主,系统的复特征频率从3000 Hz提高到5300 Hz。

关键词：制动器制动尖叫制动压力复模态相对馈入能量