检索结果-南通市图书馆

维普期刊数据库博看期刊

A deep Koopman operator-based modelling approach for long-term prediction of dynamics with pixel-level measurements

在线全文

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2024年第1期9卷 178-196页

作者： Yongqian Xiao zixin Tang Xin Xu Xinglong zhang Yifei Shi College of Intelligence Science and Technology National University of Defense TechnologyChangshaChina

Although previous studies have made some clear leap in learning latent dynamics from high-dimensional representations,the performances in terms of accuracy and inference time of long-term model prediction still need to be *** this study,a deep convolutional network based on the Koopman operator(CKNet)is proposed to model non-linear systems with pixel-level measurements for long-term *** adopts an autoencoder network architecture,consisting of an encoder to generate latent states and a linear dynamical model(i.e.,the Koopman operator)which evolves in the latent state space spanned by the *** decoder is used to recover images from latent *** to a multi-step ahead prediction loss function,the system matrices for approximating the Koopman operator are trained synchronously with the autoencoder in a mini-batch *** this manner,gradients can be synchronously transmitted to both the system matrices and the autoencoder to help the encoder self-adaptively tune the latent state space in the training process,and the resulting model is time-invariant in the latent ***,the proposed CKNet has the advantages of less inference time and high accuracy for long-term *** are per-formed on OpenAI Gym and Mujoco environments,including two and four non-linear forced dynamical systems with continuous action *** experimental results show that CKNet has strong long-term prediction capabilities with sufficient precision.

关键词： deep neural networks image motion analysis image sequences sequential estimation

可食性膜复合天然保鲜剂在肉品保鲜中应用的研究进展

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国食品添加剂 2024年第8期35卷 223-229页

作者：张紫欣王瑶赵雅宁王琳琳姜宝杰河北农业大学理工系黄骅061100 南昌大学食品学院南昌330000 河北省人畜共患病原微生物分析与防控重点实验室保定071001

可食性膜主要通过阻止水分、气体和溶质的迁移等提高食品的新鲜度和机械性能,大量应用在果蔬、肉制品、水产品及其他食品中,具有天然性、安全性和生物可降解性等特点。天然保鲜剂来源广,种类多,抑菌机理各不相同,是食品中常用的添加剂,... 详细信息

可食性膜主要通过阻止水分、气体和溶质的迁移等提高食品的新鲜度和机械性能,大量应用在果蔬、肉制品、水产品及其他食品中,具有天然性、安全性和生物可降解性等特点。天然保鲜剂来源广,种类多,抑菌机理各不相同,是食品中常用的添加剂,可防止食品在加工、运输、销售的过程中发生腐败变质,具有适用范围广、安全性高、保鲜效果好等优点。可食性膜复合天然保鲜剂技术已经成为肉制品保鲜方法中的研究热点。本文简要介绍了可食性膜的制备和分类、常用的天然保鲜剂种类以及可食性膜复合天然保鲜剂在食品保鲜中的应用。同时分析了其在肉制品保鲜应用中存在的问题,可为肉制品保鲜的研究提供技术借鉴。

关键词：可食性膜天然保鲜剂复合肉品保鲜

Stress arch bunch and its formation mechanism in blocky stratified rock masses

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2012年第1期4卷 19-27页

作者： Xin Huang zixin zhang State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou221008China Department of Geotechnical Engineering School of Civil EngineeringTong~i UniversityShanghai200092China

Stress arch is a common phenomenon occurring in continuous materials and has also l：een proved to have great influences on the self-stabilization of soils or rock masses after excavation. In this paper, based on UDEC simulation, stress redistribution after excavation is investigated for a kind of special discontinuous material, i.e. blocky stratified rock mass. A layered stress arch system is observed with each stress arch lying over another. This special phenomenon is defined herein as ＂stress arch bunch＂. Effects of dip angle of bedding plane, lateral pressure and joint offset on this stress arch bunch are studied. Its formation mechanism is also discussed based on voussoir beam theory.

关键词： blocky stratified rock mass UDEC stress arch bunch voussoir beam

Composition optimization and performance prediction for ultra-stable water-based aerosol based on thermodynamic entropy theory

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第3期33卷 437-446页

作者： Tingting Kang Canjun Yan Xinying Zhao Jingru Zhao zixin Liu Chenggong Ju Xinyue zhang Yun zhang Yan Wu College of Chemical Engineering and Materials Science Tianjin University of Science and TechnologyNo.29 13th AvenueEconomic and Technologic Development ZoneTianjin 300457China Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization Tianjin University of Science and TechnologyTianjin 300457China College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China

Water-based aerosol is widely used as an effective strategy in electro-optical countermeasure on the battlefield used to the preponderance of high efficiency,low cost and ***,the stability of the water-based aerosol is always unsatisfactory due to the rapid evaporation and sedimentation of the aerosol *** efforts have been devoted to improve the stability of water-based aerosol by using additives with different composition and ***,the lack of the criterion and principle for screening the effective additives results in excessive experimental time consumption and *** the stabilization time of the aerosol is still only 30 min,which could not meet the requirements of the perdurable ***,to improve the stability of water-based aerosol and optimize the complex formulation efficiently,a theoretical calculation method based on thermodynamic entropy theory is *** the factors that influence the shielding effect,including polyol,stabilizer,propellant,water and cosolvent,are considered within *** ultra-stable water-based aerosol with long duration over 120 min is obtained with the optimal fogging agent composition,providing enough time for fighting the electro-optic *** design guideline for choosing the additives with high phase transition temperature and low phase transition enthalpy is also proposed,which greatly improves the total entropy change and reduce the absolute entropy change of the aerosol cooling process,and gives rise to an enhanced stability of the water-based *** theoretical calculation methodology contributes to an abstemious time and space for sieving the water-based aerosol with desirable performance and stability,and provides the powerful guarantee to the homeland security.

关键词： Ultra-stable Water-based aerosol Thermodynamic entropy Composition optimization Performance prediction

Overexpression of CmSOS1 confers waterlogging tolerance in Chrysanthemum

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2020年第8期62卷 1059-1064页

作者： Lijun Wang Jiaojiao Gao zixin zhang Weimiao Liu Peilei Cheng Wenting Mu Tong Su Sumei Chen Fadi Chen Jiafu Jiang State Key Laboratory of Crop Genetics and Germplasm Enhancement Key Laboratory of LandscapingMinistry of AgricultureCollege of HorticultureNanjing Agricultural UniversityNanjing 210095China

Plants experiencing hypoxia(a shortage of oxygen)are unable to maintain aerobic respiration,which leads to an energy and carbohydrate *** pervasive and rapid accumulation of ethylene is an early and reliable response to hypoxic stress(Sasidharan and Voesenek 2015),producing an uptick in the accumulation of reactive oxygen species(ROS).This in turn triggers apoptosis in root cortex cells,eventually leading to the formation of lysigenous aerenchyma,a tissue from which ethylene is readily lost(Loreti et al.2016).In plants exposed to prolonged waterlogging,group VII ethylene response factors operate to activate the suite of genes required to establish anaerobic metabolism(Gibbs et al.2011);some of these genes are also modulated by ROS(Narsai et al.2011;Sasidharan and Voesenek 2015).The transcriptional activation of genes encoding group VII ethylene response factors is regulated by the hypoxia response attenuator 1(HRA1)protein(Pucciariello and Perata 2017).A link between the oxygen sensing and ROS signaling has been established involving the hypoxia‐responsive universal stress protein 1(HRU1),which interacts with the respiratory burst oxidase homolog D(RBOHD)(Gonzali et al.2015).Salinity also tends to induce ROS production(You and Chan 2015).

关键词： metabolism eventually maintain

Tracing monoclinic distortion in NCM532 cathode materials by in situ high-energy synchrotron X-ray diffraction

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2024年第2期34卷 274-279页

作者： Min Dong Qingya Sun Zhihua Wang zixin Rui Zhe zhang He Zhu Si Lan Herbert Gleiter Institute of Nanoscience School of Materials Science and Engineering Nanjing University of Science and Technology School of Mechanical Engineering Nanjing University of Science and Technology School of Materials Science and Engineering Henan University of Technology Center for Neutron Scattering City University of Hong Kong Shenzhen Research Institute

Layered LiNixCoyMnzO2（NCM） cathode materials have emerged as the best choice for high-energy-density lithium-ion batteries for powering electric *** significant research efforts,the understanding of complex structural dynamics during lithium（de-） intercalation still remains a subject of debate,especially in scenarios where morphology and composition *** this study,we carried out in situ high-energy synchrotron X-ray diffraction experiments on commercial NCM523cathode materials in both single crystal and polycrystalline forms to probe the structural changes during charging and discharging in *** findings reveal that both single crystal and polycrystalline materials exhibit typical H1-H2-H3 phase ***,in polycrystalline NCM532,a monoclinic intermediate phase emerges between the H1 and H2 *** this process,symmetry reduces from R-3m to C2/m,which is attributed to a shear distortion along the ab *** contrast,for single crystal materials,the H1 phase directly transforms into the H2 phase without the monoclinic *** observed monoclinic distortion significantly impacts structural stability and material cycling *** study provides new insight into the structural dynamics in NCM532 cathode materials,particularly concerning morphology-dependent behaviors,which could deepen our understanding of the relationship between NCM material structures and their performance.

关键词： Single crystals

体外冲击波疗法联合干扰电治疗膝骨关节炎的临床研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

上海医药 2024年第12期45卷 26-29,50页

作者：张紫馨俞文骏杨强玲蒋晓黎吕奇玮杨祺沈洁上海市徐汇区田林街道社区卫生服务中心康复科上海200233 上海市徐汇区天平街道社区卫生服务中心全科上海200031 上海市第八人民医院康复医学科上海200235

目的:观察体外冲击波疗法联合干扰电治疗膝骨关节炎(knee osteoarthritis,KOA)的临床疗效。方法:选取2021年1月—2023年1月在上海市徐汇区田林街道社区卫生服务中心康复科就诊的KOA患者140例,随机分成两组,每组70例。对照组采用干扰电治... 详细信息

目的:观察体外冲击波疗法联合干扰电治疗膝骨关节炎(knee osteoarthritis,KOA)的临床疗效。方法:选取2021年1月—2023年1月在上海市徐汇区田林街道社区卫生服务中心康复科就诊的KOA患者140例,随机分成两组,每组70例。对照组采用干扰电治疗,30 min/次,1次/d,5次/周,治疗4周;治疗组在对照组基础上联合体外冲击波治疗,1次/周,共治疗4周。分别采用视觉模拟量表(visual analogue scale,VAS)、西安大略和麦克马斯特大学骨关节炎指数(Western Ontario and McMaster University osteoarthritis index,WOMAC)和膝关节功能评分量表(knee joint function scale,Lysholm)评价两组患者治疗前后膝关节疼痛程度及功能。结果:治疗4周后,两组的VAS评分、WOMAC评分和Lysholm评分均较治疗前显著改善(P<0.01);两组治疗前后VAS差值、WOMAC差值和Lysholm差值间的差异均具有统计学意义(P<0.01)。结论:相比于干扰电单一治疗,体外冲击波联合干扰电治疗能更好地缓解KOA患者膝关节疼痛、肿胀与活动受限症状,明显改善患者膝关节功能。

关键词：膝骨关节炎体外冲击波干扰电疼痛功能障碍

CmBES1 is a regulator of boundary formation in chrysanthemum ray florets

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Horticulture Research 2020年第1期7卷 1097-1108页

作者： Peilei Cheng Yanan Liu Yiman Yang Hong Chen Hua Cheng Qian Hu zixin zhang Jiaojiao Gao Jiaxin zhang Lian Ding Weimin Fang Sumei Chen Fadi Chen Jiafu Jiang State Key Laboratory of Crop Genetics and Germplasm Enhancement Key Laboratory of LandscapingMinistry of Agriculture and Rural AffairsCollege of HorticultureNanjing Agricultural University210095 NanjingChina

Chrysanthemum(Chrysanthemum morifolium)is an ideal model species for studying petal morphogenesis because of the diversity in the flower form across varieties;however,the molecular mechanisms underlying petal development are poorly ***,we show that the brassinosteroid transcription factor BRI1-EMS-SUPPRESSOR 1(CmBES1)in chrysanthemum(*** ***)is important for organ boundary formation because it represses organ boundary identity *** plants overexpressing CmBES1 displayed increased fusion of the outermost ray florets due to the loss of differentiation of the two dorsal petals,which developed simultaneously with the ventral ***-seq analysis of the overexpression lines revealed potential genes and pathways involved in petal development,such as CUP-SHAPED COTYLEDON(CUC2),CYCLOIDEA 4(CYC4),genes encoding MADS-box transcription factors and homeodomain-leucine zippers(HD-Zips)and auxin pathway-related *** study characterizes the role of CmBES1 in ray floret development by its modulation of flower development and boundary identity genes in chrysanthemum.

关键词： genes boundary expressing

Coke behavior with H_(2)O in a hydrogen-enriched blast furnace:A review

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 959-976页

作者： Feng Zhou Daosheng Peng Kejiang Li Alberto N.Conejo Haotian Liao zixin Xiong Dongtao Li Jianliang zhang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Chemical Engineering The University of QueenslandSt LuciaQLD 4072Australia Baosteel Central Research Institute(R&D Center of Wuhan Iron&Steel Co. Ltd.)Wuhan 430080China Shougang Research Institute of Technology Shougang Group Corporation Ltd.Beijing 100043China Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology Beijing 100043China

Hydrogen-enriched blast furnace ironmaking has become an essential route to reduce CO_(2)emissions in the ironmaking ***,hydrogen-enriched reduction produces large amounts of H_(2)O,which places new demands on coke quality in a blast *** a hydrogen-rich blast furnace,the presence of H_(2)O promotes the solution loss *** result improves the reactivity of coke,which is 20%-30%higher in a pure H_(2)O atmosphere than in a pure CO_(2)*** activation energy range is 110-300 kJ/mol between coke and CO_(2)and 80-170 kJ/mol between coke and H_(2)***_(2)and H_(2)O are shown to have different effects on coke degradation *** review provides a comprehensive overview of the effect of H_(2)O on the structure and properties of *** exploring the interactions between H_(2)O and coke,several unresolved issues in the field requiring further research were *** review aims to provide valuable insights into coke behavior in hydrogen-rich environments and promote the further development of hydrogen-rich blast furnace ironmaking processes.

关键词： hydrogen ironmaking coke behavior blast furnace gasification microstructure kinetics