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Grain & Oil Science and Technology 2024年第1期7卷 42-49页

作者： Feng Wang Yun Cui dongjie liu Charles Brennan Soottawat Benjakul Weiwei Cheng Gengsheng Xiao Lukai Ma Key Laboratory of Green Processing and Intelligent Manufacturing of Lingnan Specialty Food of Ministry and Rural Affairs College of Light Industry and FoodZhongkai University of Agriculture and EngineeringGuangzhou 510225China School of Science Royal Melbourne Institute of Technology UniversityMelbourneAustralia International Center of Excellence in Seafood Science and Innovation Faculty of Agro-IndustryPrince of Songkla UniversitySongkhla 90110Thailand College of Food Science and Technology Zhejiang University of TechnologyHangzhou 310014China

An isotope dilution ultra-performance liquid chromatography-triple quadrupole mass spectrometry method was developed to simultaneously detect two typical kinds ofα,β-unsaturated aldehydes,namely 4-hydroxy-2-hexenal(4-HHE)and 4-hydroxy-2-nonenal(4-HNE),in *** proposed method exhibited a linear range of 10-1000 ng/mL with a limit of detection of 0.1-2.0 ng/g and a limit of quantification of 0.3-5.0 ng/*** recovery rates of these typical toxic aldehydes(i.e.,4-HHE,4-HNE)and their d3-labeled analogues were 91.54%-105.12%with a low matrix ***,this proposed method was successfully applied to a real frying system and a simulated digestion system,wherein the contents of 4-HHE and 4-HNE were determined for ***,the obtained results provide strong support for further research into the production of 4-HHE and 4-HNE resulting from foods during oil digestion and frying.

关键词： UHPLC-QqQ-MS/MS 4-Hydroxy-2-hexenal 4-Hydroxy-2-nonenal Frying Simulated digestion

Boosting photocatalytic water vapor splitting by the integration of porous g-C_(3)N_(4)and carbonized melamine foam

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Science China Materials 2024年第9期67卷 2957-2964页

作者： Shujian Wang dongjie liu Chunyang Zhang Jie Huang Shidong Zhao Kejian Lu Biao Wang Hao Peng Yitao Si Maochang liu International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an710049China School of Chemistry and Chemical Engineering Southeast UniversityNanjing211189China Suzhou Academy of Xi’an Jiaotong University Suzhou215123China Gree Altairnano New Energy Inc. Zhuhai519040China

We report a photothermally-induced liquid-solid/gas-solid-decoupling photocatalytic water-splitting system,where a carbonized melamine foam(CMF)and a porous g-C_(3)N_(4)(PCN)serve as the photothermal substrate and model photocatalyst,***,liquid water is transformed into the gaseous phase over the CMF due to the photothermal effect,and the generated vapor can be split into hydrogen by PCN via the *** unique biphasic photocatalytic system exhibits a high hydrogen production rate of 368.1µmol h^(-1),which is 2.4 and 25.6 times larger than those of the traditional triphasic PCN system(151.7µmol h^(-1))and g-C_(3)N_(4)(CN)system(14.4µmol h^(-1)),*** improved photocatalytic performance is mainly attributed to the optimized energy and mass transfer at the gas-liquid-solid reaction interface,where gas products are rapidly desorbed in the photocatalytic *** work provides a novel strategy to enhance the photocatalytic performance from the perspectives of energy and mass flow.

关键词： photocatalytic photothermal mass transfer g-C_(3)N_(4) gas-solid

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钢脚裂纹原因分析

金属热处理 2024年第6期49卷 305-307页

作者：毕廉刘冬杰薛峰鞍钢集团北京研究院有限公司北京102209

通过金相显微镜、布氏硬度计和电感耦合等离子体发射光谱仪对钢脚裂纹进行分析。结果表明,钢脚非金属夹杂物较少,显微组织为调质态索氏体,与热处理工艺相符,化学成分满足GB/T 3077—2015要求。断口形貌呈细瓷状,未见疲劳开裂特点。整个... 详细信息

通过金相显微镜、布氏硬度计和电感耦合等离子体发射光谱仪对钢脚裂纹进行分析。结果表明,钢脚非金属夹杂物较少,显微组织为调质态索氏体,与热处理工艺相符,化学成分满足GB/T 3077—2015要求。断口形貌呈细瓷状,未见疲劳开裂特点。整个裂纹两侧均未见脱碳、氧化、折叠形貌,为典型淬火裂纹形貌。开裂原因为大小工件同炉处理,造成小工件冷速过快,应力过大,进而形成开裂。

关键词：钢脚淬火裂纹原因分析

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城市快速路交织区交通震荡演化特性分析

复杂系统与复杂性科学 2024年第2期21卷 154-160页

作者：胡嫣然邴其春张伟健沈富鑫高鹏刘东杰青岛理工大学机械与汽车工程学院山东青岛266520 青岛市交通运输公共服务中心山东青岛266100

为更精确地提取震荡数据,深入探究交通震荡演化特性,首先,通过采用单指数衰减函数拟合震荡车辆的速度标准差分析震荡的增长特性。其次,利用短时傅里叶变换提取频率强度的变化追踪震荡头车和减速阶段的加减速变化点,从而探究震荡的传播... 详细信息

为更精确地提取震荡数据,深入探究交通震荡演化特性,首先,通过采用单指数衰减函数拟合震荡车辆的速度标准差分析震荡的增长特性。其次,利用短时傅里叶变换提取频率强度的变化追踪震荡头车和减速阶段的加减速变化点,从而探究震荡的传播机理。研究结果表明:震荡过程中车辆的速度标准差沿车队呈凹形增加;震荡初期表现出前驱阶段,这一阶段车速变化缓慢,随着速度波动增大,震荡增长为向上游传播;减速阶段震荡的持续时间、振幅呈递增趋势,强度保持稳定;受交织区车辆随机性和不稳定性影响,主线不同车道发生的震荡因车辆行为不同在减速阶段的持续时间、振幅和强度大小存在差异。

关键词：交通工程交通震荡短时傅里叶变换增长特性传播机理

Corrosion behavior of a Mg-Zn-Ca-La alloy in 3.5 wt%NaCl solution

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Journal of Magnesium and Alloys 2022年第2期10卷 567-580页

作者： Yuzhou Du Xin Wang dongjie liu Wanting Sun Bailing Jiang School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China Shaanxi Province Engineering Research Center for Magnesium Alloys Xi’an University of TechnologyXi’an 710048China School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808China

The present study investigates the corrosion behavior of a Mg–Zn–Ca–La *** indicate that the corrosion resistance is enhanced by rolling deformation and subsequent annealing treatment *** microstructure,distribution of second phase and grain orientation are the main factors affecting corrosion *** second phase with semi-continuous network in the as-cast alloy gives rise to the penetration of corrosion into the ***,the dispersed second phase after deformation results in uniform *** formation of dense corrosion layer at the initial stage of corrosion is favorable for the improvement of corrosion *** sample withplane oriented towards surface exhibits good corrosion resistance,which is ascribed to the homogeneous microstructure and strong basal texture.

关键词： Mg–Zn–Ca–La Rolling Second phase Texture Corrosion properties

Data Augmentation Technology Driven By Image Style Transfer in Self-Driving Car Based on End-to-End Learning

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Computer Modeling in Engineering & Sciences 2020年第2期122卷 593-617页

作者： dongjie liu Jin Zhao Axin Xi Chao Wang Xinnian Huang Kuncheng Lai Chang liu School of Mechanical Engineering Guizhou UniversityGuiyang550025China. Faculty of electronic and information engineering Xi’an Jiaotong UniversityXi’an710049China.

With the advent of deep learning,self-driving schemes based on deep learning are becoming more and more *** perception-action models should learn from data with different scenarios and real behaviors,while current end-to-end model learning is generally limited to training of massive data,innovation of deep network architecture,and learning in-situ model in a simulation ***,we introduce a new image style transfer method into data augmentation,and improve the diversity of limited data by changing the texture,contrast ratio and color of the image,and then it is extended to the scenarios that the model has been unobserved *** by rapid style transfer and artistic style neural algorithms,we propose an arbitrary style generation network architecture,including style transfer network,style learning network,style loss network and multivariate Gaussian distribution *** style embedding vector is randomly sampled from the multivariate Gaussian distribution and linearly interpolated with the embedded vector predicted by the input image on the style learning network,which provides a set of normalization constants for the style transfer network,and finally realizes the diversity of the image *** order to verify the effectiveness of the method,image classification and simulation experiments were performed ***,we built a small-sized smart car experiment platform,and apply the data augmentation technology based on image style transfer drive to the experiment of automatic driving for the first *** experimental results show that:(1)The proposed scheme can improve the prediction accuracy of the end-to-end model and reduce the model’s error accumulation;(2)the method based on image style transfer provides a new scheme for data augmentation technology,and also provides a solution for the high cost that many deep models rely heavily on a large number of label data.

关键词： Deep learning self-driving end-to-end learning style transfer data augmentation.

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超声微波协同提升贡柑片热风干燥效率的研究

轻工学报 2024年第4期39卷 1-8页

作者：肖更生沈乔眉林可为王锋刘东杰马路凯仲恺农业工程学院轻工食品学院/农业农村部岭南特色食品绿色加工与智能制造重点实验室/广东省岭南特色食品科学与技术重点实验室广东广州510225

借助动力学、热力学等方法,研究不同热风干燥温度下贡柑片在干燥过程中的干燥规律、动力学模型、水分迁移、热力学参数等,解析超声微波协同预处理对热风干燥贡柑片干燥效率的影响。结果表明:贡柑片的干燥过程遵循Two term exponential模... 详细信息

借助动力学、热力学等方法,研究不同热风干燥温度下贡柑片在干燥过程中的干燥规律、动力学模型、水分迁移、热力学参数等,解析超声微波协同预处理对热风干燥贡柑片干燥效率的影响。结果表明:贡柑片的干燥过程遵循Two term exponential模型,干燥速率与干燥温度有关,且当干燥温度为80℃时,干燥速率最快;超声微波协同预处理可有效缩短贡柑片的干燥时间(缩短了0.5~1.5 h),并显著降低其水分扩散的活化能(降低了1.620 kJ/mol);同一热风干燥温度下,超声微波协同预处理组的ΔH^(≠)、ΔS^(≠)和ΔG^(≠)均低于对照组;超声微波协同预处理可提高贡柑片的水分扩散有效系数(4.333×10^(-7)~8.967×10^(-7)),使其表面形成更多孔道。因此,超声微波协同预处理可有效提高贡柑片的热风干燥效率。

关键词：贡柑片超声微波协同预处理热风干燥热质传递效率水分迁移

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常见加工型荔枝的品质分析及干燥规律研究

农产品加工 2024年第9期 1-8页

作者：张桐马路凯刘东杰王锋柳建良农业农村部岭南特色食品绿色加工与智能制造重点实验室仲恺农业工程学院轻工食品学院广东广州510225

以3种大宗荔枝品种为研究对象,通过对妃子笑、黑叶和怀枝3种品种荔枝的果实品质指标和干燥规律及其果皮、果肉的营养指标进行差异分析。结果表明,妃子笑和怀枝荔枝果肉营养较为丰富,各自优势成分有所差异,而黑叶荔枝果肉的灰分较高;荔... 详细信息

以3种大宗荔枝品种为研究对象,通过对妃子笑、黑叶和怀枝3种品种荔枝的果实品质指标和干燥规律及其果皮、果肉的营养指标进行差异分析。结果表明,妃子笑和怀枝荔枝果肉营养较为丰富,各自优势成分有所差异,而黑叶荔枝果肉的灰分较高;荔枝果皮比荔枝果肉拥有更丰富的活性物质,拥有较高的开发价值;3个荔枝品种果肉干燥规律从结果看无明显差异。试验为评价荔枝品质的差异,并为荔枝果皮在深加工方向提供理论依据。

关键词：荔枝品质分析干燥规律

A FEM-BEM FORMULATION FOR AN EXTERIOR QUASILINEAR ELLIPTIC PROBLEM IN THE PLANE

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Journal of Computational Mathematics 2008年第3期26卷 378-389页

作者： dongjie liu Dehao Yu LSEC ICMSEC Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100080 China

In this paper, the finite element method and the boundary element method are combined to solve numerically an exterior quasilinear elliptic problem. Based on an appropriate transformation and the Fourier series expansion, the exact quasilinear artificial boundary conditions and a series of the corresponding approximations for the given problem are presented. Then the original problem is reduced into an equivalent problem defined in a bounded computational domain. We provide error estimate for the Galerkin method. Numerical results are presented to illustrate the theoretical results.

关键词： Boundary element Coupling Finite element Quasilinear problems

Thermally stable and highly efficient red-emitting Eu^(3+)-doped Cs3GdGe309 phosphors for WLEDs:non-concentration quenching and negative thermal expansion

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Light(Science & Applications) 2021年第2期10卷 243-255页

作者： Peipei Dang Guogang Li Xiaohan Yun Qianqian Zhang dongjie liu Hongzhou Lian Mengmeng Shang Jun Lin State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of Sciences130022 ChangchunChina University of Science and Technology of China 230026 HefeiChina Engineering Research Center of Nano-Geomaterials of Ministry of Education Faculty of Materials Science and ChemistryChina University of Geosciences430074 WuhanChina School of Material Science and Engineering Shandong University266071 JinanChina School of Applied Physics and Materials Wuyi University529020 GuangdongChina

Red phosphor materials play a key role in improving the lighting and backlit display quality of phosphor-converted white light-emitting diodes(pc-WLEDs).However,the development of a red phosphor with simultaneous high efficiency,excellent thermal stability and high colour purity is still a *** this work,unique non-concentration quenching in solid-solution Cs_(3)Gd_(1-x)Ge_(3)O_(9):xEu^(3+)(CGGO:xEu^(3+))(x=0.1-1.0)phosphors is successfully developed to achieve a highly efficient red-emitting Cs_(3)EuGe_(3)0_(9)(CEGO)*** the optimal 464 nm blue light excitation,CEGO shows a strong red emission at 611 nm with a high colour purity of 95.07%and a high internal quantum efficiency of 94%.Impressively,this red-emitting CEGO phosphor exhibits a better thermal stability at higher temperatures(175-250℃,>90%)than typical red K2SiF6:Mn^(4+)and Y203:Eu^(3+)phosphors,and has a remarkable volumetric negative thermal expansion(coefficient of thermal expansion,a=—5.06×10^(-5)/℃,25-250℃).By employing this red CEGO phosphor,a fabricated pc-WLED emits warm white light with colour coordinates(0.364,0.383),a high colour rendering index(CRI=89.7),and a low colour coordinate temperature(CCT=4508 K).These results indicate that this highly efficient red-emitting phosphor has great potential as a red component for pc-WLEDs,opening a new perspective for developing new phosphor materials.

关键词： expansion thermal purity