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等离子体增强型ZnO基纳米线异质结阵列光电探测器

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红外与激光工程 2024年第3期53卷 184-192页

作者：吴茴彭嘉隆江金豹李晗升徐威郭楚才张检发朱志宏国防科技大学前沿交叉学科学院新型纳米光电信息材料与器件湖南省重点实验室湖南长沙410073

低维ZnO基光电探测器具有高响应性和高光子吸收能力。然而,ZnO较窄的吸收范围以及较低的光生载流子寿命限制了低维ZnO材料在光电子学中的潜在应用。该研究展示了一种零维(0D)金属纳米等离子体增强氧化锌纳米线(ZnO)-硒化锌(ZnSe)异质结... 详细信息

低维ZnO基光电探测器具有高响应性和高光子吸收能力。然而,ZnO较窄的吸收范围以及较低的光生载流子寿命限制了低维ZnO材料在光电子学中的潜在应用。该研究展示了一种零维(0D)金属纳米等离子体增强氧化锌纳米线(ZnO)-硒化锌(ZnSe)异质结阵列的新型光电探测器。与基于单纯ZnO纳米线阵列的探测器件比较表明,该探测器具有优异的光电响应性能。在可见光作用下,该器件的响应度和平均上升(下降)时间分别为1.7 mA/W和1.812 ms(1.803 ms),在10 h连续测试中表现出优异的稳定性,为开发高性能光电探测器提供了一种低成本、可规模化的方法,有望在可穿戴设备、光通信系统、环境传感器等多方面得到应用。

关键词：等离子体增强 ZnO纳米线纳米线异质结光电探测器

对采用Modbus通讯协议的压力变送器检定方法的探讨

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工业计量 2024年第2期34卷 11-13页

作者：张蕾薛飞朱志宏江阴市计量测试检定所

依据JJG 882—2019《压力变送器》检定规程，压力变送器的常见输出信号为标准电压或电流信号，也有采用符合通讯协议的数字量作为输出信号的，由于标配的标准器无法读取数字量，导致检定工作无法开展。文章采用VB6.0语言，调用Mscomm控... 详细信息

依据JJG 882—2019《压力变送器》检定规程，压力变送器的常见输出信号为标准电压或电流信号，也有采用符合通讯协议的数字量作为输出信号的，由于标配的标准器无法读取数字量，导致检定工作无法开展。文章采用VB6.0语言，调用Mscomm控件，编制串口通讯软件，读取压力变送器的输出信号，完成检定工作，为此类问题的解决提供了一个思路。

关键词：压力变送器 RS485接口 Modbus_RTU通讯协议 VB6.0语言

Predicting plant traits and functional types response to grazing in an alpine shrub meadow on the Qinghai-Tibet Plateau

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Science China Earth Sciences 2012年第5期55卷 837-851页

作者： zhu zhihong WANG XiaoAn LI YingNian WANG Gang GUO Hua Colleee of Life Sciences Shaanxi Normal UniversityXi'an 710062China Northwest Institute of Plateau Biology Chinese Academy of SciencesXining 810008China College of Life Sciences Lanzhou UniversityLanzhou 710000China

The identification of easily measured plant functional types (PFTs) that consistently predict grazing response would be a major *** responses to grazing of individual traits and PFTs were analyzed along a grazing gradient in an alpine shrub meadow on the Qinghai-Tibet Plateau,*** response types were identified;grazing increaser (GI),grazing decreaser (GD),and neutral (NE) for both traits and *** traits were measured:plant height,economic group,cotyledon type,plant inclination,growth form,life cycle,and vegetative *** first five were significantly affected by *** regressions for grazing response of the seven traits showed that the best single predictors of response were growth form (including the attributes "Scattered","Bunched" or "Closely Bunched"),and plant inclination ("Rosette","Prostrate",or "Erect"),followed by economic group ("Shrub","Grass","Sedge","Legume","Forb",or "Harmful") and plant height ("Tall","Medium",or "Small").Within the four optimal traits,the summed dominance ratio (SDR) of small plants,forbs,rosette and bunched plants,invariably increased,while that of tall plants,shrubs,grasses,and erect plants decreased,when grazing pressure was *** correspondence analysis (CCA) identified eleven explanatory PFTs based on 195 defined PFTs,by combining the different attributes of the four optimal *** explanatory PFTs,the most valuable in predicting the community response to grazing were Tall×Shrub×Erect×Scattered and Small×Forb×Rosette,as these have the closest connections with grazing disturbance and include fewer *** richness,diversity,and community evenness,did not differ among grazing treatments because turnover occurred in component species and their relative abundances along the grazing *** have demonstrated that a minimum set of PFTs resulting from optimal individual traits can provide consistent prediction of community responses to grazing in this *** app

关键词： Alpine shrub meadow grazing response optimal traits plant functional types

Harmonic reducer in-situ fault diagnosis for industrial robots based on deep learning

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Science China(Technological Sciences) 2022年第9期65卷 2116-2126页

作者： ZHOU Xing ZHOU HuiCheng HE YiMing HUANG ShiFeng zhu zhihong CHEN JiHong School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Foshan Institute of Intelligent Equipment Technology Foshan 528234China

The harmonic reducer is an essential kinetic transmission component in the industrial *** is easy to be fatigued and resulted in physical malfunction after a long period of ***,an accurate in-situ fault diagnosis for the harmonic reducers in an industrial robot is especially *** paper proposes a fault diagnosis method based on deep learning for the harmonic reducer of industrial robots via consecutive time-domain vibration *** the sampling signals from industrial robots are long,narrow,and channel-independent,this method combined a 1-dimensional convolutional neural network with matrix kernels(1-D MCNN)adaptive *** adjusting the size of the convolution kernels,it can concentrate on the contextual feature extraction of consecutive time-domain data while retaining the ability to process the multi-channel fusion *** proposed method is examined on a physical industrial robot platform,which has achieved a prediction accuracy of99%.Its performance is appeared to be superior in comparison to the traditional 2-dimensional CNN,deep sparse automatic encoding network(DSAE),multilayer perceptual network(MLP),and support vector machine(SVM).

关键词： harmonic reducer industrial robots fault diagnosis convolutional neural network(CNN)

MnBr_(2)catalyzed regiospecific oxidative Mizoroki-Heck type reaction

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Chinese Chemical Letters 2022年第5期33卷 2391-2396页

作者： Xiang Chen zhihong zhu Shanshan Liu Yi-Hung Chen Xiao Shen Institute for Advanced Studies Engineering Research Center of Organosilicon Compounds&MaterialsMinistry of EducationWuhan UniversityWuhan 430072China

Herein, we report an unprecedented regiospecific oxidative Mizoroki-Heck type reaction for the synthesis of α-difluoromethyl homoallylic alcohols. The reaction shows broad substrate scopes and high functional group tolerance. Late-stage functionalization of complex biologically active molecules demonstrates the synthetic potential of this transformation. Mechanistic study supports the involvement of MnBr_(2) catalyzed radical 1,2-silyl transfer.

关键词： Fluoroalkylation Mizoroki-Heck Mn catalysis Radical 1,2-silyl transfer Homoallylic alcohols

Solar radiation effects on leaf nitrogen and phosphorus stoichiometry of Chinese fir across subtropical China

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Forest Ecosystems 2021年第4期8卷 831-840页

作者： Ran Tong Yini Cao zhihong zhu Chenyang Lou Benzhi Zhou Tonggui Wu Qianjiangyuan Forest Ecosystem Research Station Research Institute of Subtropical ForestryChinese Academy of ForestryHangzhou 311400China East China Coastal Forest Ecosystem Long-term Research Station Research Institute of Subtropical ForestryChinese Academy of ForestryHangzhou 311400China Guangdong Provincial Key Laboratory of Water Quality 313 Improvement and Ecological Restoration for Watersheds Institute of Environmental and Ecological EngineeringGuangdong 314 University of TechnologyGuangzhou 510006China Zhejiang A&F University Hangzhou 311300China

Background:Solar radiation(SR)plays critical roles in plant physiological processes and ecosystems ***,the exploration of SR influences on the biogeochemical cycles of forest ecosystems is still in a slow progress,and has important implications for the understanding of plant adaption strategy under future environmental ***,this research was aimed to explore the influences of SR on plant nutrient characteristics,and provided theoretical basis for introducing SR into the establishment of biochemical models of forest ecosystems in the future ***:We measured leaf nitrogen(N)and phosphorus(P)stoichiometry in 19 Chinese fir plantations across subtropical China by a field *** direct and indirect effects of SR,including global radiation(Global R),direct radiation(Direct R)and diffuse radiation(Diffuse R)on the leaf N and P stoichiometry were ***:The linear regression analysis showed that leaf N concentration had no association with SR,while leaf P concentration and N:P ratio were negatively and positively related to SR,*** least squares path model(PLS-PM)demonstrated that SR(*** R and Diffuse R),as a latent variable,exhibited direct correlations with leaf N and P stoichiometry as well as the indirect correlation mediated by soil P *** direct associations(path coefficient=−0.518)were markedly greater than indirect associations(path coefficient=−0.087).The covariance-based structural equation modeling(CB-SEM)indicated that SR had direct effects on leaf P concentration(path coefficient=−0.481),and weak effects on leaf N *** high SR level elevated two temperature indexes(mean annual temperature,MAT;≥10°C annual accumulated temperature,≥10℃ AAT)and one hydrological index(mean annual evapotranspiration,MAE),but lowered the soil P ***,MAE and soil P content could affect the leaf P concentration,which cause the indirect effect of SR on leaf P concentration(pa

关键词： Solar radiation Leaf Soil Nitrogen and phosphorus Stoichiometry Chinese fir

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考虑空箱调运的班轮运输枢纽港选址问题

工业工程与管理 2024年第1期29卷 22-31页

作者：王乾郑建风张佳艺郭力铭朱志红杜浩铭大连海事大学交通运输工程学院辽宁大连116026 青岛科技大学数理学院山东青岛266061

空箱调运成本已成为班轮运输公司经营成本的重要组成部分。考虑到规模经济和船舶运力对空箱调运的影响,可折叠集装箱的使用是班轮运输公司降低运营成本的一种有效途径。结合可折叠集装箱的特点,本文研究了一类考虑空箱调运的班轮枢纽选... 详细信息

空箱调运成本已成为班轮运输公司经营成本的重要组成部分。考虑到规模经济和船舶运力对空箱调运的影响,可折叠集装箱的使用是班轮运输公司降低运营成本的一种有效途径。结合可折叠集装箱的特点,本文研究了一类考虑空箱调运的班轮枢纽选址问题。在传统枢纽港选址模型的基础上,提出了几种综合考虑重箱和空箱的混合整数线性规划模型,探讨了空箱调运和可折叠集装箱的使用对枢纽港选址的影响。数值实验证明了所提模型的有效性。结果表明:可折叠集装箱的使用对枢纽港选址和喂给港分配产生了较大影响;在北欧,泽布吕赫会顶替安特卫普成为枢纽港,承担北欧大部分港口的空箱中转服务;在亚洲,中国香港由于较高的折叠展开作业成本,成为枢纽港的概率会略微下降。

关键词：枢纽港选址混合整数线性规划空箱调运可折叠集装箱

High performance electro-optic modulator based on thin-film lithium niobate

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Optoelectronics Letters 2022年第10期18卷 583-587页

作者： LIU Leshu LIU Ning ZHANG Jianfa zhu zhihong LIU Ken College of Advanced Interdisciplinary Studies&Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices National University of Defense TechnologyChangsha410073China

Electro-optic(EO) modulator plays a very critical role in the optical communication systems. Here, we report a stimulated thin-film lithium niobate(LN) modulator with a half-wave voltage-length product of 1.8 V·cm, which can successfully achieve modulation and demodulation of a 1 GHz sinusoidal signal with an amplitude of 5 V in experiment. The optical loss caused by metal electrodes is reduced by optimizing the waveguide structure and depositing silica onto the waveguide, and group-velocity matching and characteristic impedance matching are achieved by optimizing the buffer silica layer and the electrode structure for larger bandwidth, which simultaneously improves the modulation efficiency and bandwidth performance. Our work demonstrated here paves a foundation for integrated photonics.

关键词： modulator waveguide lithium

A robust bifunctional catalyst for rechargeable Zn-air batteries:Ultrathin NiFe-LDH nanowalls vertically anchored on soybeanderived Fe-N-C matrix

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Nano Research 2021年第4期14卷 1175-1186页

作者： Meng Zhang Jiting Zhang Siyi Ran Lingxi Qiu Wei Sun Ying Yu Jisheng Chen zhihong zhu Institute of Nano-science and Nano-technology College of Physical Science and TechnologyCentral China Normal UniversityWuhan 430079China Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province College of Chemistry and Chemical EngineeringHainan Normal UniversityHaikou 571158China

ABSTRACT NiFe layered double hydroxide(NiFe-LDH)nanosheets and metal-nitrogen-carbon materials(M-N-C,M=Ni,Fe,Co,etc.)are supreme catalysts in the oxygen evolution reaction(OER)and oxygen reduction reaction(ORR)process,***,the monotonic performance and insufficient stability severely hamper their practical application in rechargeable ***,we simultaneously combine ultrathin NiFe-LDH nanowalls with renewable soybean-derived Fe-N-C matrix to obtain a hybrid materials(NiFe-LDH/FeSoy-CNSs-A),which exhibits robust catalytic activities for OER(E_(j=10)=1.53 V ***)and ORR(E_(1/2)=0.91 V ***),with a top-notch battery parameters and stability in assembled rechargeable Zn-air *** investigations indicate that the vertically dispersed NiFe-LDH nanosheets,Fe-N-C matrix derived from soybean and the strong synergy between them are responsible for the unprecedented OER and ORR *** key role of intrinsic N defects involved in the hybrid materials is firstly specified by ultrasoundassisted extraction of soy protein from *** exquisite design can facilitate the utilization of sustainable biomass-derived catalysts,and the mechanism investigations of N defects and oxygenic groups on the structure-activity relationship can stimulate the progress of other functional hybrid electrocatalysts.

关键词： biomass Fe-N-C NiFe-LDH oxygen reduction reaction oxygen evolution reaction rechargeable Zn-air batteries