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数媒时代大学生红色文化沉浸式教育的检视与策略

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白城师范学院学报 2024年第1期38卷 19-28页

作者：张宝君骆文迪吉林师范大学马克思主义学院吉林四平136000

数媒时代,科学技术的颠覆性发展给大学生红色文化沉浸式教育提供了新的场域和技术支撑。按照“互联网+”思维,推进数字技术与红色文化的优势聚合,已成为红色文化承传的时代之需。受观念、技术和能力制约,大学生红色文化教育,还存在资源... 详细信息

数媒时代,科学技术的颠覆性发展给大学生红色文化沉浸式教育提供了新的场域和技术支撑。按照“互联网+”思维,推进数字技术与红色文化的优势聚合,已成为红色文化承传的时代之需。受观念、技术和能力制约,大学生红色文化教育,还存在资源发掘不够、内容创新滞后、协同供给不精等现实困境。强化技术赋能作用,促进红色文化数字化转型,推动红色文化教育创新发展,需要在强化资源挖掘、优化内容供给、构建传播矩阵等层面统筹谋划。

关键词：大学生红色文化沉浸式教育策略

Design of on-chip 15-18 GHz ultra low noise amplifier

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The Journal of China Universities of Posts and Telecommunications 2014年第4期21卷 15-18,31页

作者： GAO Yuan zhang bao-jun zhang Bo School of Electronic Engineering Xi'an University of Posts and Telecommunications

With rapid development communication system, high signal to noise ratio （SNR） system is required. In high frequency bandwidth, high loss, low Q inductors and high noise figure is a significant challenge with on-chip monolithic microwave integrated circuits （MMICs）. To overcome this problem, high Q, low loss transmission line characteristics was analyzed. Compared with the same inductor value of the lumped component and the transmission line, it has a higher Q value and lower loss performance in high frequency, and a 2-stage common-source low noise amplifier （LNA） was presented, which employs source inductor feedback technology and high Q low loss transmission line matching network technique with over 17.6 dB small signal gain and 1.1 dB noise figure in 15 GHz-18 GHz. The LNA was fabricated by WIN semiconductors company 0.15 μm gallium arsenide （GaAs） P high electron mobility transistor （P-HEMT） process. The total Current is 15 mA, while the DC power consumption is only 45 mW.

关键词： LNA GAAS P-HEMT MMIC K-bAND

Fracture Behavior of Cold Sprayed 304 Stainless Steel Coating During Cold Rolling

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Journal of Iron and Steel Research International 2012年第11期19卷 57-63页

作者： MENG Xian-ming zhang jun-bao HAN Wei ZHAO Jie School of Materials Science and Engineering Dalian University of Technology Dalian 116024 LiaoningChina baosteel Research Institute Baoshan Iron and Steel Co Ltd Shanghai 201900 China

The fracture behavior of cold sprayed 304 stainless steel coating in cold rolling process was studied. The 304 stainless steel coatings were deposited on low carbon steel substrate by cold gas dynamic spray （CGDS） and then cold rolled, respectively. The fracture morphology of the coatings was observed and analyzed, and the crack distri- butions along the longitudinal rolling direction of the coatings were also investigated and discussed. The results showed that the cohesive strength of the cold sprayed 304 stainless steel coating was too low to be cold rolled. Mi crocracks were formed in the as-sprayed coatings and ran perpendicularly to the rolling direction. The spacing dis- tance between these cracks decreased with the increase of the cold rolling reduction. In addition, it was also found that the initial crack generated at the surface of the coating and propagated from the surface to the interface along the weakly bonded particles. A theoretical analysis was developed for the coating fracture. It gave a critical minimum cohesive bonding strength of the coating for non-breaking in cold rolling process. The crack propagation manner of the cold rolled coatings was also discussed.

关键词： fracture cold spraying cold rolling 304 stainless steel coating microstructure

Wind erodibility indices of aeolian sandy soils impacted by different vegetation restoration:a case study from the Shannan valley of the Yarlung Zangbo River

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Journal of Mountain Science 2022年第10期19卷 2830-2845页

作者： zhang bao-jun XIONG Dong-hong LIU Lin TANG Yong-fa Key Laboratory of Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China College of Water Conservancy and Hydropower Engineering Sichuan Agricultural UniversityYa'an 625014China

Controlling aeolian desertification is a key ecological target on the Tibetan Plateau,especially within the widespread river *** recovery can change the near-soil surface characteristics,which thus may influence wind erodibility of ***,these potential effects are not sufficiently evaluated for aeolian sandy *** study selected the Shannan valley of the Yarlung Zangbo River on the southern Tibetan Plateau as a case to investigate the variations in wind erodibility of aeolian sandy soils impacted by different vegetation restoration,since many ecological measures have been implemented in recent decades in the river *** vegetated sandy lands with different restoration types and ages and two bare sandy lands(as controls)were chosen as test *** vegetated sandy lands were covered by Artemisia wellbyi,Hedysarum scoparium,Sophora moorcroftiana,and Populus *** the similar restoration age of 10 *** Sophora moorcroftiana and Populus ***,two restoration ages of 6 and over 30 years were also selected *** erodibility was reflected by wind erodible fraction(EF),mean weight diameter of dry aggregates(MWD),capillary water capacity(CWC),soil cohesion(CS),and soil penetration resistance(PR)from different aspects.A comprehensive wind erodibility index(CWEI)was further produced by a weighted summation method to combine those five indices together and comprehensively quantify the effects of vegetation restoration on wind erodibility of aeolian sandy *** results showed that revegetation was efficient to reduce wind erodibility of aeolian sandy *** generally decreased,while MWD,CWC,CS,and PR increased after vegetation restoration on the aeolian sandy *** CWEI of vegetated sandy lands varied greatly from 0.850 to 0 under different restoration types and ages and decreased by 14.4%to 100%compared to the *** the four different restoration types,Populus *** the relatively minimum CWEI,fol

关键词： Wind erosion Soil erodibility Erodible fraction Vegetation type Ecological restoration Yarlung Zangbo River valley

Effect of Barrier Materials on Discharge Properties in Air at Low Pressure

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高电压技术 2007年第12期33卷 80-84页

作者： LIMing LI Cheng-rong ZHAN Hua-mao XU Jin-bao zhang Xian-jun Beijing Key Laboratory of High Voltage ~ EMC School of Electric and Electronic Engineering North China Electric Power University Beijing 102206 China

Dielectric barrier discharge(DBD) is widely investigated in order to obtain uniform low-temperature *** studies have proved that some barrier materials,especially electrets,can improve the uniformity of *** is regarded as an available way to get atmospheric pressure glow discharge(APGD).In this paper,discharge forms with 4 different barrier materials(alumina,quartz,PTFE and PET) are investigated,and the transition of discharge form depending on the air pressure are recorded to estimate the influence of barrier materials on *** using electrets as barrier materials,homogeneous discharges can be obtained in a more wide pressure *** the same experimental conditions,discharges with electrets are more uniform or have larger uniform areas due to the storage and desorption of charges on the surface of *** electrons deposited in the surface layer can be released on next half cycle when the polarity of the applied voltage changes,and provide a number of seed electrons,which makes the discharge more *** capacitance and the permittivity of barrier materials have no effect on the discharge form directly.

关键词：放电特性低气压电子跃迁电介体表面电荷栅栏

Feedback of Efficient Shock Acceleration on Magnetic-field Structure Inside Young Type Ia Supernova Remnants

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Research in Astronomy and Astrophysics 2024年第6期24卷 234-244页

作者： jun-Yu Shen Bi-Wen bao Li zhang Department of Astronomy Key Laboratory of Astroparticle Physics of Yunnan ProvinceYunnan UniversityKunming 650091China Key Laboratory of Statistical Modeling and Data Analysis of Yunnan Province Yunnan UniversityKunming 650091China

Using an effective adiabatic index γ_(eff) to mimic the feedback of efficient shock acceleration,we simulate the temporal evolution of a young type Ia supernova remnant (SNR) with two different background magnetic field(BMF) topologies:a uniform and a turbulent *** density distribution and magnetic-field characteristics of our benchmark SNR are studied with two-dimensional cylindrical magnetohydrodynamic *** γ_(eff)is considered,we find that:(1) the two-shock structure shrinks and the downstream magnetic-field orientation is dominated by the Rayleigh–Taylor instability structures;(2) there exists more quasi-radial magnetic fields inside the shocked region;and (3) inside the intershock region,both the quasi-radial magnetic energy density and the total magnetic energy density are enhanced:in the radial direction,with γ_(eff)=1.1,they are amplified about 10–26 times more than those with γ_(eff)=5/*** in the angular direction,the total magnetic energy densities could be amplified about 350 times more than those with γ_(eff)=5/3,and there are more grid cells within the intershock region where the magnetic energy density is amplified by a factor greater than 100.

关键词： methods:numerical ISM:magnetic fields ISM:supernova remnants magnetohydrodynamics(MHD)

Effects of vegetation coverage and seasonal change on soil microbial biomass and community structure in the dry-hot valley region

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Journal of Mountain Science 2018年第7期15卷 1546-1558页

作者： WU Han XIONG Dong-hong XIAO Liang zhang Su YUAN Yong SU Zheng-an zhang bao-jun YANG Dan Key Laboratory of Mountain Hazards and Earth Surface Processes Institute of Mountain Hazards and Environment Chinese Academy of Science Chengdu 610041 China University of Chinese Academy of Sciences Beijing 100049 China

Soil microorganisms are sensitive indicator of soil health and quality. Understanding the effects of vegetation biomass and seasonal change on soil microorganisms is vital to evaluate the soil quality and implement vegetation restoration. This study analyzed the soil phospholipid fatty acids(PLFAs) in fresh and withered Kudzu(Pueraria montana var. lobata) vegetation conditions in different seasons. The results showed that vegetation biomass and seasonal change significantly affected microbial biomass and its community structure. Both fresh and withered Kudzu cover significantly increased soil microbial biomass, and the growth effect of microbes in the soil with fresh Kudzu cover was more obvious than that with withered Kudzu cover. Compared with the dry season, the rainy season significantly increased the microbial biomass and the B/F(the ratio of bacterial to fungal PLFAs) ratio but dramatically reduced the G+/G-(the ratio of gram-positive to gram-negative bacteria PLFAs). Kudzu cover and seasonal change had a significant effect on microbial structure in soil covered by higher vegetation biomass. Furthermore, soil temperature and moisture had different correlations with specific microbial biomass in the two seasons. Our findings highlight the effect of Kudzu vine cover on the soil microenvironment and soil microhabitat, enhancing the soil quality in the Dry-hot Valley of Jinsha River, Southwest China.

关键词： Phospholipid fatty acid Vegetation Soil microbes Soil temperature Soil moisture Dry-hot valley

Research progress of slippage characteristic and gas film stability enhancement methods on biomimetic hydrophobic surfaces

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Journal of Hydrodynamics 2024年第1期36卷 87-101页

作者： Meng-zhuo zhang Hai-bao Hu Liu-zhen Ren Lu-yao bao jun Wen Luo Xie School of Marine Science and Technology Northwestern Polytechnical UniversityXi’an710072China Research and Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen518063China

The biomimetic hydrophobic surface is a potentially efficient underwater drag reduction method and the drag reduction mechanism of this kind of surface comes from the interfacial *** now,it is a hotspot to grasp the slippage characteristic and explore slippage enhancement *** paper not only summarizes our numerical simulation and experimental results of slippage characteristic at the solid-liquid interface(SLI)of hydrophobic surfaces(HS)and the gas-liquid interface(GLI)of superhydrophobic surfaces(SHS)in recent years,but also introduces some innovative methods that can effectively improve the gas film stability and drag reduction effect of ***,we used the molecular dynamics(MD)simulation method to figure out the effect of the solid-liquid interaction strength,the system temperature and the shear rate on the slippage of SLI,and expound their action mechanism from molecular ***,by MD and multibody dissipative particle dynamics(MDPD)method,the slippage behavior at the GLI was studied under the influence of the microstructure size and the flow driving *** proposed a new kind of hybrid slip boundary condition model to describe the slippage characteristic on *** addition,we found through experiment that a three-dimensional backflow will appear on the GLI under the interfacial adsorption of surfactants,and the backflow direction will reverse with the change of GLI ***,we put forward the wettability step structure and gas injection method to enhance the stability and drag reduction effect of the gas film on SHS.

关键词： Hydrophobic surface superhydrophobic surface interfacial slip underwater drag reduction

A novel weld-pool-length monitoring method based on pixel analysis in plasma arc additive manufacturing

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Advances in Manufacturing 2024年第2期12卷 335-348页

作者： bao-Ri zhang Yong-Hua Shi Bionic Robot Research Department Ji Hua LaboratoryFoshan528200GuangdongPeople’s Republic of China Guangdong Provincial Engineering Research Center for Special Welding Technology and Equipment School of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhou510640People’s Republic of China

The real-time monitoring of the weld pool during deposition is important for automatic control in plasma arc additive *** obtain a high deposition accuracy,it is essential to maintain a stable weld pool *** this study,a novel passive visual method is proposed to measure the weld pool *** the proposed method,the image quality was improved by designing a special visual system that employed an endoscope and a *** also includes pixel brightness-based and gradient-based algorithms that can adaptively detect feature points at the boundary when the weld pool geometry *** algorithm can also be applied to materials with different solidification *** was performed to measure the real weld pool length in world coordinates,and outlier rejection was performed to increase the accuracy of the ***,tests were carried out on the intersection component,and the results showed that the proposed method performed well in tracking the changing weld pool length and was applicable to the real-time monitoring of different types of materials.

关键词： Plasma arc additive manufacturing(PAAM) Weld pool geometry Gradient analysis Real-time detection