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Design and in-situ construct BiOI/Bi/TiO_(2)photocatalysts with metal-mediated heterostructures employing oxygen vacancies in TiO_(2)nanosheets

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Green Energy & Environment 2022年第4期7卷 680-690页

作者： Chenchen Zhang Wenbin Chen Dairong Hu Hanjie Xie Yibing Song Binbin Luo Yiwen Fang wenhua gao Ziyi Zhong Department of Chemistry Shantou UniversityGuangdong515063China Department of Chemical Engineering Guangdong Technion-Israel Institute of Technology(GTIIT)Guangdong515063China Technion-Israel Institute of Technology(IIT) Haifa32000Israel

The conventional p-n heterojunction photocatalysts suffer from the incompatibility between the interfacial charge transfer efficiency and the redox ability of charge carriers.To optimize the interfacial charge transfer of the conventional BiOI/TiO_(2) p-n photocatalyst,we synthesized the BiOI/Bi/TiO_(2) ternary photocatalyst with sandwiched metallic bismuth(Bi~0)by the oxygen-vacancy assisted method.The DFT calculation and structural characterizations confirmed the reaction of the electron-rich oxygen vacancies in the 2D-TiO_(2) nanosheets(TiO_(2)-NS)with the adsorbed BiO~+species.This reaction broke the Bi-O bonds to form Bi^(0) nanoparticles in-situ at the interface but still maintained the p-n heterojunction well.The NO-TPD and XRD analyses for samples correlated the Bi~0 formation with the oxygen vacancy concentrations well.The sandwiched Bi~0 functioned as an electronic transfer mediator like that in the Z-scheme heterostructure.Comparing with 0.20 BiOI/TiO_(2)-NP(NP,Nanoparticles),0.20 BiOI/Bi/TiO_(2)-NS-a(NS,Nanosheet)showed a much improved catalytic performance,i.e.,duplicated apparent quantum yield(AQY)and triplicated reaction rate constant(k).Also,the formation mechanism and the reaction mechanism were investigated in detail.This work provides a new strategy for the improving of the conventional p-n photocatalysts and new insights into the nature of the photocatalysis.

关键词： TiO_(2)nanosheets Oxygen vacancy Metallic bismuth Sandwiched heterostructure Photocatalysis

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Exponential stability of stochastic Markovian jump systems with time-varying and distributed delays

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Science China(Information Sciences) 2021年第10期64卷 251-253页

作者： Xueyan ZHAO Feiqi DENG wenhua gao School of Automation Science and Engineering South China University of Technology School of Mathematics South China University of Technology

Dear editor,In the field of applied mathematics and control theory,the research on stochastic Markovian jump systems has attracted increasing attention in recent years. A few studies have been conducted on stochastic Markovian jump systems [1–6]. Most previously conducted studies on stochastic Markovian jump systems investigate the discrete timevarying delay [4–6], whereas the distributed delay has not been given much attention owing to the difficulties involved in applying mathematical analysis.

关键词： stochastic Markovian jump systems Exponential stability distributed delays time-varying delays Lyapunov function

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Relationships between Cloud Droplet Spectral Relative Dispersion and Entrainment Rate and Their Impacting Factors

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Advances in Atmospheric Sciences 2022年第12期39卷 2087-2106,I0016-I0019页

作者： Shi LUO Chunsong LU Yangang LIU Yaohui LI wenhua gao Yujun QIU Xiaoqi XU Junjun LI Lei ZHU Yuan WANG Junjie WU Xinlin YANG College of Aviation Meteorology Civil Aviation Flight University of ChinaGuanghan 618307China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration Nanjing University of Information Science&TechnologyNanjing 210044China Environmental and Climate Sciences Department Brookhaven National LaboratoryUptonNew York 11973US State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China Nanjing Joint Institute for Atmospheric Sciences Nanjing 210019China Collaborative Innovation Center for Western Ecological Safety Lanzhou UniversityLanzhou 730000China

Cloud microphysical properties are significantly affected by entrainment and mixing processes.However,it is unclear how the entrainment rate affects the relative dispersion of cloud droplet size distribution.Previously,the relationship between relative dispersion and entrainment rate was found to be positive or negative.To reconcile the contrasting relationships,the Explicit Mixing Parcel Model is used to determine the underlying mechanisms.When evaporation is dominated by small droplets,and the entrained environmental air is further saturated during mixing,the relationship is negative.However,when the evaporation of big droplets is dominant,the relationship is positive.Whether or not the cloud condensation nuclei are considered in the entrained environmental air is a key factor as condensation on the entrained condensation nuclei is the main source of small droplets.However,if cloud condensation nuclei are not entrained,the relationship is positive.If cloud condensation nuclei are entrained,the relationship is dependent on many other factors.High values of vertical velocity,relative humidity of environmental air,and liquid water content,and low values of droplet number concentration,are more likely to cause the negative relationship since new saturation is easier to achieve by evaporation of small droplets.Further,the signs of the relationship are not strongly affected by the turbulence dissipation rate,but the higher dissipation rate causes the positive relationship to be more significant for a larger entrainment rate.A conceptual model is proposed to reconcile the contrasting relationships.This work enhances the understanding of relative dispersion and lays a foundation for the quantification of entrainment-mixing mechanisms.

关键词： clouds entrainment rate relative dispersion of cloud droplet size distribution mixing and evaporation

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Research on cigarette during smoking based on reverse engineering and numerical simulation

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Chinese Journal of Chemical Engineering 2019年第10期27卷 2359-2375页

作者： Darong Tang JunzhangWu Jinsong Zeng wenhua gao Liang Du State Key Laboratory of Pulp and Paper Engineering Plant Micro/Nano Fiber Research CenterSouth China University of TechnologyGuangzhou 510640China China Tobacco Guangdong Industrial Co.Ltd. Guangzhou 510385China

The three-dimensional(3 D)model of cigarette was accurately constructed through reverse engineering as the research object of numerical simulation.The combustion process of cigarette was studied with computational fluid dynamics(CFD).Standard Laminar models with species transport approach were applied,and numerical simulation of the cigarette was analyzed with semi-implicit method for pressure–velocity coupling.The results showed that the model could predict velocity of cigarette smoke,the distributions of temperature and pressure at different times.In order to verify the correctness of model,it was found that the relationship between the velocity of smoke and pressure according to Darcy’s law on z position(x=4 mm,y=0,0 mm≤z≤50.61 mm).

关键词： Cigarette Reverse engineering Computational fluid dynamics

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Microphysical Properties of Rainwater in Typhoon Usagi(2013):A Numerical Modeling Study

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Advances in Atmospheric Sciences 2019年第5期36卷 510-526页

作者： Lin DENG wenhua gao Yihong DUAN Yuqing WANG Nanjing University of Information Science and Technology State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences International Pacific Research Center and Department of Atmospheric Sciences School of Ocean and Earth Science and Technology University of Hawai'i at Mānoa

A 2-km resolution simulation using the Weather Research and Forecasting model with Morrison microphysics was employed to investigate the rainwater microphysical properties during different stages of Typhoon Usagi(2013) in the inner-core and outer region. The model reproduced the track, intensity, and overall structure of Usagi(2013) reasonably. The simulated raindrop size distribution showed a rapid increase in small-size raindrop concentration but an oscillated decrease in large-size ones in the inner-core region, corresponding well with the upward motion. It was found that there existed two levels(1.25 and 5.25 km) of maximum number concentration of raindrops. The ice-related microphysics at high levels was stronger than the warm-rain processes at low levels. The larger raindrops formed by self-collection in the inner-core suffered from significant breakup, but the raindrops outside the eyewall did not experience evident breakup. Model results indicated that the dominant terms in the water vapor budget were the horizontal moisture flux convergence(HFC) and local condensation and deposition. The evaporation from the ocean surface(PBL) was ~10% of the HFC in the inner core, but up to 40% in the outer region as the air therein was far from saturation. Furthermore, water vapor in the outer region was obtained equally through evaporation from the cloud and inward transportation from the environment. An earlier start of cloud microphysical processes in the inner-core region was evident during the intensification stage, and the continuous decreasing of condensation in both the inner-core and outer regions might imply the beginning of the storm weakening.

关键词： raindrops microphysical properties typhoon simulation

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交通荷载下煤矸石路基填料累积变形PSO-BP神经网络预测模型

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水利水电科技进展 2024年第2期44卷 87-91页

作者：张宗堂肖天祥高文华杨洋衣利伟湖南科技大学岩土工程稳定控制与健康监测湖南省重点实验室湖南湘潭411201 湖南建工集团有限公司湖南长沙410004 湖南软件职业技术大学湖南湘潭411201 甘肃省靖远煤业工程勘察设计有限公司甘肃白银730913 中国建筑第五工程局有限公司湖南长沙410004

基于煤矸石路基填料大型动三轴试验结果,采用灰色关联分析法分析累积变形影响因子,确定了围压、压实度、级配参数、循环荷载振动次数4个特征参数。引入PSO算法对BP神经网络的权重、阈值进行全局寻优并赋值,提出了一种煤矸石路基填料累... 详细信息

基于煤矸石路基填料大型动三轴试验结果,采用灰色关联分析法分析累积变形影响因子,确定了围压、压实度、级配参数、循环荷载振动次数4个特征参数。引入PSO算法对BP神经网络的权重、阈值进行全局寻优并赋值,提出了一种煤矸石路基填料累积变形PSO-BP神经网络预测模型。与传统BP神经网络模型对比结果验证了该预测模型的可行性和优越性,并通过不同学习程度下模型的预测效果分析了模型的泛化能力,证明了模型的预测潜力。

关键词：煤矸石路基累积变形预测灰色关联分析粒子群算法 BP神经网络

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CT血管成像联合彩色多普勒超声设计游离股骨内侧髁骨瓣治疗难治性手舟骨骨折不愈合

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中华整形外科杂志 2024年第2期40卷 187-194页

作者：高文华赵书明张路李栋樊安未王祝民华北医疗健康集团邢台总医院骨三科邢台054000 山东省文登整骨医院骨、手显微外科(一) 文登264400

目的:探讨术前CT血管成像(CTA)联合彩色多普勒超声(CDU)血管定位技术辅助下游离带血管蒂的股骨内侧髁骨瓣的手术方法治疗难治性手舟骨骨折不愈合的临床效果。方法:回顾性分析2018年1月至2022年6月华北医疗健康集团邢台总医院骨三科应用... 详细信息

目的:探讨术前CT血管成像(CTA)联合彩色多普勒超声(CDU)血管定位技术辅助下游离带血管蒂的股骨内侧髁骨瓣的手术方法治疗难治性手舟骨骨折不愈合的临床效果。方法:回顾性分析2018年1月至2022年6月华北医疗健康集团邢台总医院骨三科应用以膝降动脉为血供的游离股骨内侧髁骨瓣转移修复手舟骨陈旧性骨折合并骨坏死患者病例资料。术前采用CTA联合CDU技术定位膝降动脉,依照定位结果及骨质缺损情况设计股骨内侧髁骨瓣并修复手舟骨陈旧性骨折。采用门诊和电话方式进行随访,依照视觉模拟评分(VAS)评价腕关节疼痛程度,依照改良Mayo评分法评价腕关节功能,手舟骨弓背畸形程度根据舟骨角评价,腕骨间稳定程度根据舟月角评价。正态分布计量资料以x±s表示,采用配对样本t检验比较术前CDU测定及术中实际测定的膝降动脉起始处血管管径、起始处至股骨内侧髁下缘距离,并比较手术前后疼痛VAS评分、腕功能Mayo评分、握力、腕关节活动度、舟月角、舟骨角。结果:共纳入12例患者,其中男9例,女3例;年龄23~56岁,平均36岁;右侧骨折7例,左侧5例;手舟骨腰部骨折8例,近极骨折4例。比较术前CDU测定和术中实际测量的膝降动脉起始处血管管径[(1.7±0.5)mm vs.(1.8±0.7)mm]、起始处至股骨内侧髁下缘距离[(11.9±2.1)cm vs.(12.1±1.9)cm],差异均无统计学意义(P>0.05)。术后所有患者均获得6个月~2年随访,平均13个月。全部患者经X线片检查显示手舟骨骨性愈合,平均愈合时间为15周。术后6个月随访时,比较手术前后疼痛VAS评分[(3.7±0.9)分vs.(0.5±0.1)分]、腕功能Mayo评分[(46.1±3.8)分vs.(86.2±6.1)分]、舟月角[(65.3±4.1)°vs.(47.9±3.5)°]、舟骨角[(37.1±3.9)°vs.(22.8±2.3)°]、腕关节屈伸活动度[(79.0±11.7)°vs.(118.5±15.8)°]、握力[(6.7±4.6)kg vs.(26.1±5.3)kg],差异均有统计学意义(P<0.05)。结论:游离带血管蒂的股骨内侧髁骨瓣为修复手舟骨陈旧性骨折伴有骨坏死的理想方法之一,术前血管定位技术有效指导了骨瓣设计、切取,保证术中操作快速、准确。

关键词：手舟骨骨折不愈合超声检查多普勒彩色 CT血管成像股骨内侧髁骨瓣

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废弃口罩加筋的煤矸石路基粗粒土填料动力特性试验研究

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防灾减灾工程学报 2024年第2期44卷 426-433页

作者：肖天祥高文华张宗堂沈子钰何钰周泽林湖南科技大学岩土工程稳定控制与健康监测湖南省重点实验室湖南湘潭411201

为实现废弃口罩资源化再利用,将其运用于煤矸石路基的加筋中,通过开展循环荷载作用下不同加筋方式、不同口罩含量的煤矸石路基填料大型动力三轴试验,探讨了口罩加筋煤矸石路基的可行性和影响因素,研究了口罩对煤矸石路基的加筋效果。研... 详细信息

为实现废弃口罩资源化再利用,将其运用于煤矸石路基的加筋中,通过开展循环荷载作用下不同加筋方式、不同口罩含量的煤矸石路基填料大型动力三轴试验,探讨了口罩加筋煤矸石路基的可行性和影响因素,研究了口罩对煤矸石路基的加筋效果。研究结果表明:(1)口罩加筋煤矸石路基粗粒土填料能取得良好的加筋效果;(2)不同加筋方式、纤维尺寸、口罩裁剪方向、路基中的口罩含量均会对口罩加筋煤矸石路基粗粒土填料的加筋效果产生影响;(3)在已尝试的试验方案中,土样每20 cm铺设一层口罩织物的加筋效果系数为1.663,加筋效果最为出色。在不同口罩含量对比试验中,土样中口罩含量为30个时,加筋效果系数为2.3,取得了最好的加筋效果,但从现有数据规律中可推论仍有提升空间。研究成果可为煤矸石路基填料改良提供参考。

关键词：路基加筋废弃口罩处理大型三轴试验累积变形

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木醋液中苯酚等酚类物质的应用分析

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广东化工 2024年第3期51卷 64-66页

作者：高文华刘志明王海英东北林业大学林学院黑龙江哈尔滨150040 东北林业大学材料科学与工程学院黑龙江哈尔滨150040

通过乙酸乙酯萃取-旋转薄膜蒸发-丙酮萃取-旋转薄膜蒸发精制松木屑木醋液并进行气相色谱-质谱(GC-MS)分析,结果表明相对含量最高的化合物是苯酚(18.92%)。木醋液的稀释液种子萌发实验结果表明,稀释倍数为2000倍时,萝卜和菠菜的发芽率与... 详细信息

通过乙酸乙酯萃取-旋转薄膜蒸发-丙酮萃取-旋转薄膜蒸发精制松木屑木醋液并进行气相色谱-质谱(GC-MS)分析,结果表明相对含量最高的化合物是苯酚(18.92%)。木醋液的稀释液种子萌发实验结果表明,稀释倍数为2000倍时,萝卜和菠菜的发芽率与对照组差异极显著,分别为96%和97%,而对照组的发芽率分别为82%和83%,处理组的发芽率均比对照组高;稀释倍数为100倍时,萝卜和菠菜的发芽率与对照组差异极显著,均只有3%,均比对照组低。

关键词：松木屑木醋液 GC-MS分析苯酚种子萌发化感效应敏感指数

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依托超星平台实现“电子技术实验”考核

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电气电子教学学报 2024年第2期46卷 184-186页

作者：闫晓梅高文华曹俊琴王志社太原科技大学电子信息工程学院太原030024

分析目前“电子技术实验”课程考核中存在的问题,以“模拟电子技术实验”为例,依托超星平台,建立了多维度的过程性考核体系。利用超星平台的统计和评价功能,将学生的成绩分为线上和线下两部分,线上成绩包括预习和测验。线下成绩包括实... 详细信息

分析目前“电子技术实验”课程考核中存在的问题,以“模拟电子技术实验”为例,依托超星平台,建立了多维度的过程性考核体系。利用超星平台的统计和评价功能,将学生的成绩分为线上和线下两部分,线上成绩包括预习和测验。线下成绩包括实验操作,实验报告和素养成绩。实践证明,多维度的过程性考核体系能大大提高学生的学习兴趣,提升学生的综合能力和创新能力,能全面客观地评价学生的学习效果和极大地提升实验教学质量。

关键词：电子技术实验超星平台考核评价体系

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