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智能媒体技术在融媒体时代新闻创作中的应用

电视技术 2024年第1期48卷 74-76页

作者：于超乳山市融媒体中心山东威海264500

科学技术不断创新的背景下,智能媒体技术应运而生,并在传媒领域实现了广泛应用。新闻创作是新闻媒体的一项重要工作。融媒体时代,传统新闻创作理念和技术逐渐无法满足现实需求。将智能媒体技术应用于新闻媒体新闻创作中,创新新闻创作理... 详细信息

科学技术不断创新的背景下,智能媒体技术应运而生,并在传媒领域实现了广泛应用。新闻创作是新闻媒体的一项重要工作。融媒体时代,传统新闻创作理念和技术逐渐无法满足现实需求。将智能媒体技术应用于新闻媒体新闻创作中,创新新闻创作理念和技术,发挥智能媒体技术优势,提高新闻创作效率和质量,有助于更好地满足融媒体时代受众对新闻信息的多元化、个性化需求。基于此,概述智能媒体技术的概念、特点及关键技术,分析智能媒体技术要点,探讨智能媒体技术在融媒体时代新闻创作中的应用路径。

关键词：融媒体时代智能媒体技术新闻创作

Cost-efficient Thermal Management for a 48V Li-ion Battery in a Mild Hybrid Electric Vehicle

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Automotive Innovation 2018年第4期1卷 320-330页

作者： chao yu Guangji Ji chao Zhang John Abbott Mingshen Xu Pieter Ramaekers Jianxiang Lu Pan Asia Technical Automotive Center Co.Ltd Jufeng Road No.2199ShanghaiChina Ricardo UK Ltd Shoreham-by-SeaUK

The 48V mild hybrid system is a cost-efficient solution for original equipment manufacturers to meet increasingly stringent fuel consumption requirements.However,hybrid functions such as auto-stop/start and brake regeneration are unavailablewhen a 48V battery is at very low temperature because of its limited charge and discharge capability.Therefore,it is important to develop cost-efficient thermal management to warm-up the battery of a 48V mild hybrid electric vehicle(HEV)to recover hybrid functions quickly in cold climate.Following the model-based“V”process,we first define the requirements and then design different mechanisms to heat a 48V battery.Afterward,we build a 48V battery model in LMS AMESim and conduct co-simulation with simplified battery management system and hybrid control unit algorithms in MATLAB Simulink for analysis.Finally,we carry out a series of vehicle experiments at low temperature and observe the effect of heating to validate the design.Both simulation results and experimental data show that a cold 48V battery placed in a cabin with hot air can be heated effectively in the developed“Enhanced Generator Mode with 48V Battery”mode.The entire design is in a newly developed software that cyclically charges and discharges a 48V battery for quick warm-up in cold temperature without needing any additional hardware such as a heater,making it a cost-efficient solution for HEVs.

关键词： 48V Li-ion battery Thermal management Mild hybrid electric vehicle Battery modeling

Photon subtraction-based continuous-variable measurement-device-independent quantum key distribution with discrete modulation over a fiber-to-water channel

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Communications in Theoretical Physics 2022年第3期74卷 36-43页

作者： chao yu Yin Li Jianzhi Ding yun Mao Ying Guo School of Computer Science and Engineering Central South UniversityChangsha 410083China School of Automation Central South UniversityChangsha 410075China School of Computer Science Beijing University of Posts and TelecommunicationsBeijing 100876China

We propose a discrete-modulated continuous-variable measurement-device-independent quantum key distribution protocol over a fiber-to-water channel.Different from optical fibers,the underwater channel has more severe optical attenuation because of optical absorption and scattering,which reduces the maximum communication distance.To enhance the performance of the protocol,the photon subtraction operation is implemented at the modulator side.We carry out a performance simulation in two different kinds of seawater channel,and the result shows that the scheme with photon subtraction has a longer secure communication distance under certain conditions.

关键词： measurement-device-independent discrete modulation fiber-to-water channel continuous variable quantum key distribution

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静音水下航行器的水动力特性数值研究

北京大学学报（自然科学版） 2024年第2期60卷 203-209页

作者：戴袁鋆任世成张纪华余超北京大学工学院力学与工程科学系北京100871 北京机电工程研究所北京100074

为了克服传统螺旋桨推进航行器推进效率低、灵活性差和噪声大的缺点,针对一种仿生柔性体推进的水下航行器的水动力特性进行数值研究,分析柔性体波动的振幅和波数对水动力特性的影响、仿生表面对水动力性能的影响以及整体设计对水动力特... 详细信息

为了克服传统螺旋桨推进航行器推进效率低、灵活性差和噪声大的缺点,针对一种仿生柔性体推进的水下航行器的水动力特性进行数值研究,分析柔性体波动的振幅和波数对水动力特性的影响、仿生表面对水动力性能的影响以及整体设计对水动力特性的影响。数值结果表明,增大振幅将显著地增大静水推力,同时增加推进阻力;增加波数则显著地增加推进阻力,并减小静水推力。此外,使用仿生表面和现有的前尖端设计,可以减小推进阻力。研究结果有利于进一步优化航行器,提高航行器推进效率。

关键词：水下航行器仿生推进柔性体水动力特性

Assessment of Left Atrial Function by Full Volume Real-time Three-dimensional Echocardiography and Left Atrial Tracking in Essential Hypertension Patients with Different Patterns of Left Ventricular Geometric Models

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Chinese Medical Sciences Journal 2013年第3期28卷 152-158页

作者： Yang Wang Lin Gao Jian-bai Li chao yu Department of Ultrasound Second Affiliated Hospital of Dalian Medical University Department of Ultrasound Panjin Municipal Central Hospital Department of Ultrasound Dongguan Municipal People's Hospital

Objective To evaluate left atrial function in essential hypertension patients with different patterns of left ventricular geometric models by real-time three-dimensional echocardiography(RT-3DE)and left atrial tracking(LAT).Methods One hundred and thirty-three patients with essential hypertension were divided into four groups according to criteria proposed by Ganau et al:36 patients in normal pattern group(I),34 patients in concentric remodelling pattern group(II),33 patients in concentric hypertrophy pattern group(III),and 30patients in eccentric hypertrophy pattern group(IV).Thirty-two healthy volunteers were enrolled in this study.RT-3DE and LAT were used to obtain the volume-time and emptying fraction curves,and then the maximal volume,minimal volume,stroke volume,presystolic volume,ejection fraction,systolic filling rate,early diastolic emptying rate and late diastolic emptying rate of the left atrium were measured.Conduit volume and passive emptying volume of the left atrium were calculated.Results Left atrial indexes,conduit volume,passive emptying volume,and early diastolic emptying rate decreased,while the other indices increased in the group I compared with the control group(all P0.05).There was a positive correlation between RT-3DE and LAT in evaluating left atrial function.Conclusions Left atrial booster pump function decreases in the eccentric hypertrophy pattern.Left atrial conduit function is unchanged in the normal pattern and the concentric remodelling pattern groups.RT-3DE and LAT technology can be used for quantitative evaluation of le

关键词：高血压患者超声心动图几何模型原发性心房跟踪三维实时

An esterase-responsive ibuprofen nano-micelle pre-modified embryo derived nucleus pulposus progenitor cells promote the regeneration of intervertebral disc degeneration

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Bioactive Materials 2023年第3期21卷 69-85页

作者： Kai-shun Xia Dong-dong Li Cheng-gui Wang Li-wei Ying Jing-kai Wang Biao Yang Jia-wei Shu Xian-peng Huang yu-ang Zhang chao yu Xiao-peng Zhou Fang-cai Li Nigel K.H.Slater Jian-bin Tang Qi-xin Chen Cheng-zhen Liang Department of Orthopedics 2nd Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhou310009ZhejiangPR China Orthopedics Research Institute of Zhejiang University Zhejiang UniversityHangzhou310009ZhejiangPR China Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province Hangzhou310009Zhejiang ProvincePR China Clinical Research Center of Motor System Disease of Zhejiang Province Hangzhou310009Zhejiang ProvincePR China Key Laboratory of Biomass Chemical Engineering of Ministry of Education Center for Bionanoengineering Collage of Chemical and Biological EngineeringZhejiang UniversityHangzhou310027ZhejiangPR China The Second Affiliated Hospital and yuying Children's Hospital of Wenzhou Medical University Wenzhou325000ZhejiangPR China Orthopedic Department Taizhou Hospital Affiliated to Wenzhou Medical UniversityLinhai317099ZhejiangPR China Department of Chemical Engineering and Biotechnology University of CambridgeCambridgeUnited Kingdom

Stem cell-based transplantation is a promising therapeutic approach for intervertebral disc degeneration(IDD).Current limitations of stem cells include with their insufficient cell source,poor proliferation capacity,low nucleus pulposus(NP)-specific differentiation potential,and inability to avoid pyroptosis caused by the acidic IDD microenvironment after transplantation.To address these challenges,embryo-derived long-term expandable nucleus pulposus progenitor cells(NPPCs)and esterase-responsive ibuprofen nano-micelles(PEG-PIB)were prepared for synergistic transplantation.In this study,we propose a biomaterial pre-modification cell strategy;the PEG-PIB were endocytosed to pre-modify the NPPCs with adaptability in harsh IDD microenvironment through inhibiting pyroptosis.The results indicated that the PEG-PIB pre-modified NPPCs exhibited inhibition of pyroptosis in vitro;their further synergistic transplantation yielded effective functional recovery,histological regeneration,and inhibition of pyroptosis during IDD regeneration.Herein,we offer a novel biomaterial pre-modification cell strategy for synergistic transplantation with promising therapeutic effects in IDD regeneration.

关键词： Intervertebral disc degeneration Nucleus pulposus progenitor cells Esterase-responsive nano micell Biomaterial pre-modification Synergistic transplantation therapy

Experimental investigation of the cyclic degradation of the one-way shape memory effect of NiTi alloys

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International Journal of Minerals,Metallurgy and Materials 2019年第12期26卷 1539-1550页

作者： Tian-xing Zhao Guo-zheng Kang chao yu Qian-hua Kan Institute of Applied Mechanics State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu 610031China Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengdu 610031China

Based on stress-and strain-controlled cyclic tension-unloading-heat-cooling tests,cyclic degradation of the one-way shape memory effect(OWSME)of NiTi shape memory alloys(SMAs)was investigated.It was seen,in thermo-mechanical coupled cyclic tests,that residual strain after each cycle accumulated,but the martensite reorientation stress and dissipation energy-per-cycle decreased as the number of cycles increased.Meanwhile,the cyclic degradation of OWSME was aggravated by increasing the stress/strain amplitude.In addition,the stress-strain response of NiTi SMAs was further investigated by performing simultaneous thermo-mechanical coupled cyclic tests with various phase-angle differences between the mechanical and thermal cyclic loadings.It can be concluded that such cyclic response depends significantly on prescribed phase-angle differences.Obtained experimental results are helpful for both the development of constitutive models and engineering applications of NiTi SMAs.

关键词： NiTi shape memory alloys one-way shape memory effect cyclic degradation thermo-mechanical coupling martensite orientation

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基于多尺度空洞卷积结构的路面裂缝分割方法

公路交通科技 2024年第1期41卷 1-9,17页

作者：何宇超段中兴高静西安建筑科技大学信息与控制工程学院陕西西安710055

为了实现道路裂缝的自动化检测,改善现有裂缝分割模型存在分割不连续与嘈杂背景误分割等问题,提出了一种基于多尺度空洞卷积结构的裂缝分割模型MAC-UNet。以UNet作为基础网络,首先提出了多尺度空洞卷积结构,替换编码器与解码器中的双卷... 详细信息

为了实现道路裂缝的自动化检测,改善现有裂缝分割模型存在分割不连续与嘈杂背景误分割等问题,提出了一种基于多尺度空洞卷积结构的裂缝分割模型MAC-UNet。以UNet作为基础网络,首先提出了多尺度空洞卷积结构,替换编码器与解码器中的双卷积结构,提升了网络对复杂拓扑结构的分割性能。然后,构建了交叉注意力机制,使用金字塔注意力模块代替编、解码器之间的跳跃连接,保留因池化丢失的空间特征。增加通道注意力引导多尺度信息,有效地融合到解码器特征中,使得恢复裂缝时,细节更加丰富,定位更准确。最后,在道路裂缝数据集CFD和GAPS384上与FCN、PSPNet等5种方法进行试验对比,相较于UNet,在CFD数据集上,MIOU和Kappa系数分别提升了8.4%和8.52%。在GAPS384数据集上,分别提升了6.84%和8.23%,对于道路裂缝的分割更加清晰与完整。结果表明:与主流的分割算法相比,所提出算法的识别精度方面具有较明显的优势,在光照不均匀、各种噪音干扰、背景灰度水平不同的情况下,所提模型仍然能够获取稳定的检测结果,能够应对复杂裂缝分割问题,并且可视化裂缝检测误差较小,符合实际工程需求,且模型体积较小,具有一定的工程应用价值。

关键词：道路工程裂缝识别深度学习道路裂缝空洞卷积多尺度特征

对2023年6月浙江省高考选考物理第19题中疑难问题的深入研究

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物理教学 2024年第2期46卷 57-61页

作者：俞超黄晶施叶军杭州第二中学钱江学校浙江311200 浙江省杭州学军中学浙江310012 杭州市萧山区教育发展研究中心浙江311202

2023年6月浙江省高考选考物理第19题电磁感应问题,在磁场分布、感应电动势以及能量转换等多个问题上,存在普遍性的理解上的困难,通过细致分析,深入探讨并合理地解释了这些疑难问题。

关键词：电磁感应磁场分布感应电动势能量转换磁场能