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运用多维视角融合视觉转换器的食品气调枕形包装漏气检测

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农业工程学报 2024年第3期40卷 313-320页

作者：郭向东刘天真李聪聪滕桂法河北农业大学机电工程学院保定071001 河北农业大学信息科学与技术学院保定071001 河北省农业大数据重点实验室保定071001 河北省数字农业产业技术研究院石家庄056400

食品气调枕形包装被广泛用于农产品的贮藏、运输和消费全流程,尽管工厂广泛使用的现代包装机械和人工检验手段减小了漏气风险,但是封口缺陷、贮藏和运输中的挤压、人工检验时的人为差错等造成漏气甚至瘪袋的情况时有发生,变质的袋内食... 详细信息

食品气调枕形包装被广泛用于农产品的贮藏、运输和消费全流程,尽管工厂广泛使用的现代包装机械和人工检验手段减小了漏气风险,但是封口缺陷、贮藏和运输中的挤压、人工检验时的人为差错等造成漏气甚至瘪袋的情况时有发生,变质的袋内食品既影响了消费者身体健康又导致厂商声誉受损。该文针对食品气调枕形包装的漏气检测问题,提出了一种基于多维视角融合的Vision Transformer漏气检测方法(multi-dimentional fusion vision transformer,MdF-ViT)。通过包装袋的主视角、侧视角和俯视角的融合,提取3个视角包装袋轮廓特征,综合判断包装袋形变量,完成对枕形包装的漏气检测。对样本A、样本B、样本C的测试结果表明,该种模型准确率均达到97.5%,F1值分别达到97.6%、97.6%和97.4%。该研究提出的模型可以有效应用于工厂生产并节约成本。

关键词：食品气调包装枕形包装袋检测 Vision Transformer

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基于改进YOLO v4的自然场景下冬枣果实分类识别

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江苏农业科学 2024年第1期52卷 163-172页

作者：刘天真苑迎春滕桂法孟惜河北农业大学信息科学与技术学院河北保定071001 保定学院信息工程学院河北保定071000 河北省农业大数据重点实验室河北保定071001 石家庄学院未来信息技术学院河北石家庄050035

为实现冬枣园机械化自动化采摘以及冬枣树精准化管理,针对自然场景下冬枣果实的快速、准确分类识别问题,提出一种基于YOLO v4模型改进的冬枣果实分类识别模型CC-YOLO v4。利用改进的CSP跨阶段部分连接结构和多尺度特征融合的CBAM卷积注... 详细信息

为实现冬枣园机械化自动化采摘以及冬枣树精准化管理,针对自然场景下冬枣果实的快速、准确分类识别问题,提出一种基于YOLO v4模型改进的冬枣果实分类识别模型CC-YOLO v4。利用改进的CSP跨阶段部分连接结构和多尺度特征融合的CBAM卷积注意力模块,减小网络规模的同时增强特征提取能力,改善果实分类识别的误检和遮挡目标的漏检情况;采用Softmax交叉熵损失函数代替Sigmoid二元交叉熵损失函数作为分类损失函数,引入EIoU损失函数代替CIoU损失函数作为边界框回归损失,进一步改善果实分类识别的误检并提升预测框精度。试验结果表明,CC-YOLO v4模型对3类冬枣果实的查准率P均值为81.86%,平均检测精度均值mAP为82.46%,IoU均值为81.35%,模型参数量和大小分别为26.9 M和108 MB,检测速度可达28.8 F/s。与其他模型相比,本模型具有更好的分类识别能力、识别速度和较小的模型复杂度。在不同果实数量情况下进一步试验,本研究方法具有良好的精度和鲁棒性,对解决自然场景下冬枣果实的精准分类识别问题具有重要参考价值。

关键词：冬枣果实识别 YOLO v4 损失函数自然场景

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A Shape-Memory Deployable Subsystem with a Large Folding Ratio in China’s Tianwen-1 Mars Exploration Mission

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Engineering 2023年第9期28卷 49-57页

作者： Chengjun Zeng Liwu liu Yang Du Miao Yu Xiaozhou Xin tianzhen liu Peilei Xu Yu Yan Dou Zhang Wenxu Dai Xin Lan Fenghua Zhang Linlin Wang Xue Wan Wenfeng Bian Yanju liu Jinsong Leng Department of Astronautical Science and Mechanics Harbin Institute of TechnologyHarbin 150001China Shanghai Institute of Satellite Engineering Shanghai 201109China Center for Composite Materials and Structures Harbin Institute of TechnologyHarbin 150080China Department of Civil Engineering Harbin Institute of TechnologyWeihai 264209China

Once China’s Tianwen-1 Mars probe arrived in a Mars orbit after a seven-month flight in the deep cold space environment,it would be urgently necessary to monitor its state and the surrounding *** address this issue,we developed a flexible deployable subsystem based on shape memory polymer composites(SMPC-FDS)with a large folding ratio,which incorporates a camera and two temperature telemetry points for monitoring the local state of the Mars orbiter and the deep space ***,we report on the development,testing,and successful application of the *** reaching its Mars remote-sensing orbit,the SMPC-FDS is designed to be in a folded state with high stiffness;after reaching orbit,it is in a deployed state with a large *** transition from the folded state to the deployed state is achieved by electrically heating the shape memory polymer composites(SMPCs);during this process,the camera on the SMPC-FDS can capture the local state of the orbiter from multiple ***,temperature telemetry points on the SMPC-FDS provide feedback on the environment temperature and the temperature change of the SMPCs during the energization *** simulating a Mars on-orbit space environment,the engineering reliability of the SMPC-FDS was comprehensively verified in terms of the material properties,structural dynamic performance,and thermal vacuum deployment *** the launch of Tianwen-1 on 23 July 2020,scientific data on the temperature environment around Tianwen-1 has been successfully acquired from the telemetry points on the SMPCFDS,and the local state of the orbiter has been photographed in orbit,showing the national flag of China fixed on the orbiter.

关键词： Flexible deployable structure Shape memory polymer composite Mars exploration Temperature telemetry On-orbit deployment

Free-Standing Multiscale Porous High Entropy NiFeCoZn Alloy as the Highly Active Bifunctional Electrocatalyst for Alkaline Water Splitting

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Chinese Journal of Chemistry 2024年第13期42卷 1465-1473页

作者： Qiuping Zhang Xu Wang tianzhen Jian Wenqing Ma Caixia Xu Qiuxia Zhou Hong liu Institute for Advanced Interdisciplinary Research(iAIR) Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of ShandongSchool of Chemistry and Chemical EngineeringUniversity of JinanJinanShandong 250022China School of Medical Information and Engineering Southwest Medical UniversityLuzhouSichuan 646000China State Key Laboratory of Crystal Materials Shandong UniversityJinanShandong 250100China

In the endeavor of searching for highly active and stable electrocatalysts toward overall water splitting,high-entropy-alloys have been the intense subjects owing to their advanced physicochemical *** non-noble metal free-standing multiscale porous NiFeCoZn high-entropy-alloy is in situ constructed on the surface layer of NiZn intermetallic and Ni heterojunction over nickel foam(NiFeCoZn/NiZn-Ni/NF)by one scalable dealloying protocal to fulfill the outstanding bifunctional electrocatalytic performances toward overall water *** of the high-entropy effects and specific hierarchical porous architecture,the as-made NiFeCoZn/NiZn-Ni/NF displays high intrinsic catalytic activities and durability toward both hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)in alkaline *** particular,the in-situ construction of bimodal porous NiFeCoZn high-entropy-alloy results in the small overpotentials(η1000=254/409 mV for HER and OER),low Tafel slopes,and exceptional long-term catalytic durability for 400 ***,the electrolyzer constructed with NiFeCoZn/NiZn-Ni/NF as both cathode and anode exhibits a low cell voltage of 1.72 V to deliver the current density of 500 mA·cm^(–2) for overall water *** work not only provides a facile and scalable protocol for the preparation of self-supporting high-entropy-alloy nanocatalysts but also enlightens the engineering of high performance bifunctional electrocatalysts toward water splitting.

关键词： High-entropy-alloys Bifunctional electrocatalyst Dealloying/Electrocatalysis Oxygen evolution reaction Hydrogen evolution reaction

Alloy/layer double hydroxide interphasic synergy via nano-heterointerfacing for highly reversible CO_(2)redox reaction in Li-CO_(2)batteries

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Nano Research 2024年第6期17卷 5206-5215页

作者： tianzhen Jian Wenqing Ma Jiagang Hou Jianping Ma Xianhong Li Haiyang Gao Caixia Xu Hong liu Institute for Advanced Interdisciplinary Research(iAIR) Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of ShandongSchool of Chemistry and Chemical EngineeringUniversity of JinanJinan 250022China Kyiv College at Qilu University of Technology Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China Shandong Sacred Sun Power Sources Co. Ltd.Qufu 273100China

Li-CO_(2)batteries are among the most intriguing techniques for balancing the carbon cycle,but are challenged by the annoyed thermodynamic barrier of the Li_(2)CO_(3)decomposition ***,we demonstrate the electrocatalytic performances of two-dimensional(2D)CoAl-layer double hydroxide(LDH)nanosheets can be significantly improved by trans-dimensional crosslinking with three-dimensional(3D)multilevel nanoporous(MP)-RuCoAl alloy(MP-RuCoAl alloy⊥CoAl-LDH).The MP-RuCoAl alloy⊥CoAl-LDH with multiscale pore channels and abundant nano-heterointerface is directly prepared by controllable etching Al from a Ru-Co-Al master alloy along with simultaneous partial oxidization of Al and Co *** MP-RuCoAl is composed of various intermetallic compounds and Ru with abundant grain boundaries,and forms numerous heterointerface with 2D CoAl-LDH *** multiscale porous metallic network benefits mass and electron transportation as well as discharge product storage and enables a rich multiphase reaction *** situ differential electrochemical mass spectrometry shows that the mass-to-charge ratio in the charging process is~0.733 which is consistent with the theoretical value of 3/4,stating that the reversible co-decomposition of Li_(2)CO_(3)and C can be achieved with the MP-RuCoAl alloy⊥*** Ketjen black(KB)/MP-RuCoAl⊥CoAl-LDH battery demonstrates a high cyclability for over 2270 h(227 cycles)with a lower voltage gap stabilized at~1.3 V at 200 mA·g^(−1).Our findings here provide useful guidelines for developing high efficiency transition metal based electrocatalysts by coupling with conductive porous substrate for impelling the development of practical Li-CO_(2)battery systems.

关键词： heterojunction interface nanoporous Li-CO_(2)battery dealloying

Catalytic asymmetric(3+3)cycloaddition between different 2-indolylmethanols

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Science China Chemistry 2024年第8期67卷 2629-2636页

作者： tianzhen Li Sijia liu Shufang Wu Qi Cheng Qun Chen Yinchun Jiao Yuchen Zhang Feng Shi School of Petrochemical Engineering School of Materials ScienceEngineeringChangzhou UniversityChangzhou 213164China Research Center of Chiral Functional Heterocycles School of Chemistry and Materials ScienceJiangsu Normal UniversityXuzhou 221116China School of Chemistry and Chemical Engineering Hunan University of Science and TechnologyXiangtan 411201China School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007China

The catalytic asymmetric(3+3)cycloaddition between different 2-indolylmethanols has been established,in which a series of chiral indole-fused six-membered heterocycles were constructed in high yields with excellent *** work not only has established the first catalytic asymmetric cycloaddition between different 2-indolylmethanols but also provided a powerful strategy for constructing enantioenriched indole-fused six-membered ***,biological evaluation discovered some products with promising antitumor ***,theoretical calculations performed on the reaction pathway and activation mode provide an in-depth understanding of this catalytic asymmetric(3+3)cycloaddition among different 2-indolylmethanols,which will advance the understanding of the chemistry of indolylmethanols.

关键词： asymmetric organocatalysis chiral phosphoric acid cycloaddition enantioselectivity 2-indolylmethanol

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Assessment of wheat chlorophyll content by the multiple linear regression of leaf image features

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Information Processing in Agriculture 2021年第2期8卷 232-243页

作者： Yufei Song Guifa Teng Yingchun Yuan tianzhen liu Zhimei Sun College of Information Science and Technology Hebei Agricultural UniversityBaoding 071001China College of Resources and Environment Science Hebei Agricultural UniversityBaoding 071001China College of Information Engineering Baoding UniversityBaoding 071000China

The measurement of crop nutrition is considerably significant in agricultural practices,especially in the application of mechanized variable rate *** extraction and model building are two important links in crop nutrition measurement by digital *** this paper,a feature set of fusion multi-colour space in field prototype is extracted and an evaluation approach using stepwise-based ridge regression(SBRR)that uses correlation-based evaluation method is *** the image features of three known colour spaces are extracted,meanwhile a new colour space named rgb is constructed according to the characteristics that RGB colour space easily affected by *** the SBRR with nested cross validation is used to find the best evaluation *** performance evaluation,the optimal SBRR model is obtained(R^(2)=0.718 RMSE=5.111).Additionally,compared with two other nutritional evaluation approach named backpropagation artificial neural network(BP-ANN)and k-nearest neighbors(KNN),SBRR achieves better performance in both R^(2) and *** the proposed model’s reliability is verified using the image dataset taken from the same wheat field in the next *** R^(2) and RMSE values are 0.794 and 4.304,*** comparisons and verification show that our proposed SBRR approach can achieve better experimental results and can be considered a reliable and low-cost alternative for estimating the chlorophyll content of wheat leaves in field.

关键词： Wheat chlorophyll estimation Image processing Colour feature extraction SPAD Ridge regression

Enhanced Beta2-band Oscillations Denote Auditory Hallucination in Schizophrenia Patients and a Monkey Model of Psychosis

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Neuroscience Bulletin 2024年第3期40卷 325-338页

作者： Shuo Ma tianzhen Chen Wenjun Jia Jie liu Shihan Ding Puzhe Li Hong Gan Dapeng Zhang Shuxin Shao Mu-Ming Poo Min Zhao Bomin Sun Jian Jiang Department of Neurosurgery Ruijin HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai200020China Shanghai Mental Health Center Shanghai Jiao Tong University School of MedicineShanghai200030China Shanghai Center for Brain Science and Brain-inspired Technology Lingang LaboratoryShanghai201602China University of California at Berkeley BerkeleyCA94720USA School of Life Science and Technology ShanghaiTech UniversityShanghai201210China Institute of Neuroscience CAS Center for Excellence in Brain Science and Intelligence TechnologyCAS Key Laboratory of Primate NeurobiologyState Key Laboratory of NeuroscienceChinese Academy of SciencesShanghai200031China Shanghai Center for Brain Science and Brain-Inspired Intelligence Technology Lingang LaboratoryShanghai201210China Fuyang Third People’s Hospital Fuyang Mental Health CenterFuyang236052China Shanghai Key Laboratory of Psychotic Disorders Shanghai200030China Institute of Psychological and Behavioral Science Shanghai Jiao Tong UniversityShanghai200030China Shanghai Quanlan Technology Co. LtdShanghai201602China

An electroencephalographic(EEG)signature of auditory hallucinations(AHs)is important for facilitating the diagnosis and treatment of AHs in *** recorded EEG from 25 schizophrenia patients with recurrent *** the period of AHs,EEG recordings exhibited significantly elevated beta2-band power in the temporal region,as compared to those recorded in the absence of AHs or during stimulation with verbal *** further generated methamphetamine-treated rhesus monkeys exhibiting psychosis-like behaviors,including repetitive sudden searching actions in the absence of external intrusion,suggesting the occurrence of *** EEG beta2-band power in the temporal region of these monkeys was enhanced immediately after methamphetamine treatment and positively correlated with the frequency of sudden searching ***,the enhancement of temporal beta2-band oscillations represents a signature for AHs in both patients and a monkey model of psychosis,and this monkey model can be used for developing closed-loop neuromodulation approaches for the treatment of refractory AHs in schizophrenia.

关键词： Schizophrenia Auditory hallucinations Non-human primate Methamphetamine Electroencephalography

ESCRT-Ⅲ component OsSNF7.2 modulates leaf rolling by trafficking and endosomal degradation of auxin biosynthetic enzyme OsYUC8 in rice

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Journal of Integrative Plant Biology 2023年第6期65卷 1408-1422页

作者： Liang Zhou Saihua Chen Maohong Cai Song Cui Yulong Ren Xinyue Zhang tianzhen liu Chunlei Zhou Xin Jin Limin Zhang Minxi Wu Shuyi Zhang Zhijun Cheng Xin Zhang Cailin Lei Qibing Lin Xiuping Guo Jie Wang Zhichao Zhao Ling Jiang Shanshan Zhu Jianmin Wan State Key Laboratory for Crop Genetics and Germplasm Enhancement Jiangsu Plant Gene Engineering Research CenterNanjing Agricultural UniversityNanjing 210095China National Key Facility for Crop Gene Resources and Genetic Improvement Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding/Key Laboratory of Plant Functional Genomics of the Ministry of Education/Jiangsu Key Laboratory of Crop Genetics and Physiology Agricultural College of Yangzhou UniversityYangzhou 225009China

The endosomal sorting complex required for transport(ESCRT)is highly conserved in eukaryotic cells and plays an essential role in the biogenesis of multivesicular bodies and cargo degradation to the plant vacuole or *** ESCRT components affect a variety of plant growth and development processes,their impact on leaf development is rarely ***,we found that OsSNF7.2,an ESCRT-Ⅲ component,controls leaf rolling in rice(Oryza sativa).The Ossnf7.2 mutant rolled leaf 17(rl17)has adaxially rolled leaves due to the decreased number and size of the bulliform ***7.2is expressed ubiquitously in all tissues,and its protein is localized in the endosomal ***7.2 homologs,including OsSNF7,OsSNF7.3,and OsSNF7.4,can physically interact with OsSNF7.2,but their single mutation did not result in leaf *** ESCRT complex subunits,namely OsVPS20,OsVPS24,and OsBRO1,also interact with *** assays revealed that OsSNF7.2 interacts with OsYUC8 and aids its vacuolar *** Osyuc8and rl17 Osyuc8 showed rolled leaves,indicating that OsYUC8 and OsSNF7.2 function in the same pathway,conferring leaf *** study reveals a new biological function for the ESCRT-Ⅲcomponents,and provides new insights into the molecular mechanisms underlying leaf rolling.

关键词： bulliform cell leaf rolling OsSNF7.2 OsYUC8 rice(Oryza sativa) vacuolar degradation