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用番木瓜根外植体培养体细胞胚和再生植株

世界热带农业信息 1989年第2期 36-38页

作者： m.h.chen 唐小浪

研究了两个番木瓜栽培品种的茎尖、茎叶、子叶和根外植体的再生潜力。结果表明茎尖和茎最易形成愈伤组织,而叶、子叶和根则较难。愈伤组织的诱导能力因品种而异。从3个月的根培养物中获得了体细胞胚。诱发体细胞胚的最适培养基为含有1/... 详细信息

研究了两个番木瓜栽培品种的茎尖、茎叶、子叶和根外植体的再生潜力。结果表明茎尖和茎最易形成愈伤组织,而叶、子叶和根则较难。愈伤组织的诱导能力因品种而异。从3个月的根培养物中获得了体细胞胚。诱发体细胞胚的最适培养基为含有1/2mS无机盐,160毫克/升硫酸腺嘌呤,1.0毫克/升萘乙酸,0.5毫克/升激动素和1.0毫克/升赤霉酸。用这种培养基培养的愈伤组织,两年以后仍保持很高的再生潜力。在温室条件下,已培育出由体细胞胚分化而成的植株。

关键词：愈伤组织体细胞胚外植体番木瓜琼脂培养基再生植株赤霉酸激动素栽培品种根培养物

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A Geographical Note On The Lower Tatungho Region, Tsinghai

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地理学报 1948年第Z1期 64-64页

作者： m.h.chen Geological Survey of China

This paper is a preliminary note on the general geographical fbatures of the lower Tatungho region, Tsinghai province, so far known as a less explored area. In the vicinity of the monyuan city, the river forms a broad... 详细信息

关键词： Tsinghai In A Geographical Note On The Lower Tatungho Region

外侧枕叶灰质容积减少与帕金森病病人的身体虚弱和认知障碍有关

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国际医学放射学杂志 2019年第4期 499-499页

作者：任彦 Y.S.chen h.L.chen C.h.Lu m.h.chen K.h.Chou N.W.Tsai Department of Diagnostic Radiology Kaohsiung Chang Gung Memorial Hospital Chang Gung University College of Medicine

摘要研究帕金森病(PD)病人身体虚弱和认知下降相关的脑结构变化。方法收集61例PD病人和59例年龄和性别匹配的健康对照者。对每位入组参与者的虚弱程度均按Fried

关键词：帕金森病神经心理学测试

Efficient photocatalytic reduction of CO2 to formate by a molecular noble metal-free system

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Science China Chemistry 2025年第1期68卷 152-156页

作者： Lihua Zhang Lingjing chen huatian Shi Yue Wei Gui chen Tai-Chu Lau School of Environment and Civil Engineering Research Center for Eco-environmental Engineering Dongguan University of Technology Department of Chemistry and Institute of molecular Functional materials City University of Hong Kong

Reducing CO2to carbon-neutral solar fuels can not only alleviate the energy demand but also mitigate the greenhouse *** present,developing an efficient non-noble metal photo/electrocatalytic system for converting CO2to a specific product beyond CO is still a big ***,we report a new cobalt complex bearing 2,2′-bi-1,10-phenanthroline ligand that can photocatalytically reduce CO2to formate （hCOO-）.Turnover number （TON） for hCOO-up to 677 with 99%selectivity can be achieved using organic dyes purpurin as photosensitizer and 1,3-dimethyl-2-phenyl-2,3-dihydro-1h-benzo[d]imidazole （BIh） as sacrificial reductant in a CO2-saturated NmP/TEA （v/v,3:1） solution under visible light *** potential electrolysis at-1.41 V （***/Ag Cl） in the presence of 12 m m Et3NhBF4also produced hCOO-with Faradaic efficiency of 39%.Spectroscopic and electrochemical studies suggest that a[CoI-h]species is the key intermediate for CO2reduction.

关键词： photocatalysis noble metal-free CO2 reduction formate cobalt hydride

Preparation of Low Ratio magnesium Ccement by Acid Leaching Treatment of Boron mud

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Journal of Wuhan University of Technology(materials Science) 2025年第1期40卷 120-129页

作者： YANG mei ZhANG mingzhe chen hao School of materials Science and Engineering Shenyang Jianzhu UniversityShenyang 110168China School of Physical Science and Technology Shenyang Normal UniversityShenyang 110168China

The effects of liquid-solid ratio and reaction time on the leaching rate of magnesium at room temperature were investigated,as well as the effects of the molar ratio of mgO/mgCl_(2),the amount of water added,and the amount of acid-impregnated slag dosed on the compressive strength and water resistance of *** results showed that the magnesium element in the boron mud could be maximally leached under the conditions of 1:1 concentration of hydrochloric acid at room temperature,liquid-solid ratio of 2.5 mL·g^(-1),and reaction time of 5 h,and the main products were amorphous SiO_(2) as well as a small amount of magnesium olivine which had not been completely *** LR-mOC prepared using the acid-soaked mixture could reach a softening coefficient of 0.85 for 28 d of water immersion when the molar ratio of mgO/mgCl_(2) was 2.2,the amount of water added was 0 g,and the acid-soaked slag dosing was 40 wt%,which also led to an appreciable late-strength,with an increase of 19.4%in compressive strength at 28 d compared to that at 7 *** previous studies,LR-mOC prepared in this way has a final strength phase that is not the more easily hydrolysed 3-phase but the lath-like *** this phenomenon,we analyzed the mechanism and found that,during the acid leaching process,a part of amorphous SiO_(2) dissolved in the acid leaching solution formed a silica sol,in which mg^(2+)played a bridging role to make the silica sol more *** the addition and hydrolysis of mgO,the silica sol gel coagulation slows down,providing a capping layer to inhibit the hydrolysis of the 5-phase crystals and providing some strength after *** amorphous SiO_(2) in the other part of the acid-impregnated slag generated m-S-h gel with mg^(2+)and Oh-,which synergised with the dense structure composed of interlocking crystals to improve the water resistance of LR-mOC.

关键词： boron mud magnesium chloride-oxygen cement acid immersion water resistance silica sol

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hourglass-GCN for 3D human Pose Estimation Using Skeleton Structure and View Correlation

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Computers, materials & Continua 2025年第1期82卷 173-191页

作者： Ange chen chengdong Wu Chuanjiang Leng Faculty of Robot Science and Engineering Northeastern UniversityShenyang110169China

Previous multi-view 3D human pose estimation methods neither correlate different human joints in each view nor model learnable correlations between the same joints in different views explicitly,meaning that skeleton structure information is not utilized and multi-view pose information is not completely ***,existing graph convolutional operations do not consider the specificity of different joints and different views of pose information when processing skeleton graphs,making the correlation weights between nodes in the graph and their neighborhood nodes *** Graph Convolutional Networks(GCNs)cannot extract global and deeplevel skeleton structure information and view correlations *** solve these problems,pre-estimated multiview 2D poses are designed as a multi-view skeleton graph to fuse skeleton priors and view correlations explicitly to process occlusion problem,with the skeleton-edge and symmetry-edge representing the structure correlations between adjacent joints in each viewof skeleton graph and the view-edge representing the view correlations between the same joints in different *** make graph convolution operation mine elaborate and sufficient skeleton structure information and view correlations,different correlation weights are assigned to different categories of neighborhood nodes and further assigned to each node in the *** on the graph convolution operation proposed above,a Residual Graph Convolution(RGC)module is designed as the basic module to be combined with the simplified hourglass architecture to construct the hourglass-GCN as our 3D pose estimation ***-GCNwith a symmetrical and concise architecture processes three scales ofmulti-viewskeleton graphs to extract local-to-global scale and shallow-to-deep level skeleton features *** results on common large 3D pose dataset human3.6m and mPI-INF-3DhP show that hourglass-GCN outperforms some excellent methods in 3D pose estimati

关键词： 3D human pose estimation multi-view skeleton graph elaborate graph convolution operation hourglass-GCN

multifunctional Nacre‑Like Nanocomposite Papers for Electromagnetic Interference Shielding via heterocyclic Aramid/mXene Template‑Assisted In‑Situ Polypyrrole Assembly

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Nano-micro Letters 2025年第3期17卷 37-54页

作者： Jinhua Xiong Xu Zhao Zonglin Liu he chen Qian Yan huanxin Lian Yunxiang chen Qingyu Peng Xiaodong he National Key Laboratory of Science and Technology On Advanced Composites in Special Environments Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080People’s Republic of China

Robust, ultra-flexible, and multifunctional mXene-basedelectromagnetic interference (EmI) shielding nanocomposite filmsexhibit enormous potential for applications in artificial intelligence,wireless telecommunication, and portable/wearable electronic *** this work, a nacre-inspired multifunctional heterocyclic aramid(hA)/mXene@polypyrrole (PPy) (hmP) nanocomposite paper withlarge-scale, high strength, super toughness, and excellent tolerance tocomplex conditions is fabricated through the strategy of hA/mXenehydrogel template-assisted in-situ assembly of PPy. Benefiting from the"brick-and-mortar" layered structure and the strong hydrogen-bondinginteractions among mXene, hA, and PPy, the paper exhibits remarkable mechanical performances, including high tensile strength (309.7 mPa),outstanding toughness (57.6 mJ m−3), exceptional foldability, and structural stability against ultrasonication. By using the template effect ofhA/mXene to guide the assembly of conductive polymers, the synthesized paper obtains excellent electronic conductivity. more importantly,the highly continuous conductive path enables the nanocomposite paper to achieve a splendid EmI shielding effectiveness (EmI SE) of 54.1 dBat an ultra-thin thickness (25.4 μm) and a high specific EmI SE of 17,204.7 dB cm2g−1. In addition, the papers also have excellent applicationsin electromagnetic protection, electro-/photothermal de-icing, thermal therapy, and fire safety. These findings broaden the ideas for developinghigh-performance and multifunctional mXene-based films with enormous application potential in EmI shielding and thermal management.

关键词： mXene Remarkable mechanical properties heterocyclic aramid Electromagnetic interference shielding Polypyrrole multifunctionality

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Engineering atomic Rb-N configurations to tune radical pathways for highly selective photocatalytic h2O2 synthesis coupled with biomass valorization

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Journal of Energy Chemistry 2025年第1期100卷 215-225页

作者： Jiaye Li Shuang Pan Yihuang chen Qiong Liu College of Chemistry and materials Engineering Wenzhou University Guangdong Provincial Key Laboratory of Chemical measurement and Emergency Test Technology (China) Institute of Analysis Guangdong Academy of Sciences (China National Analytical CenterGuangzhou)

Photocatalytic oxygen reduction for hydrogen peroxide （h2O2） synthesis presents a green and costeffective production ***,achieving highly selective h2O2synthesis remains challenging,necessitating precise control over free radical reaction pathways and minimizing undesirable oxidative ***,we report for the visible light-driven simultaneous co-photocatalytic reduction of O2to h2O2and oxidation of biomass using the atomic rubidium-nitride modified carbon nitride（CNRb）.The optimized CNRb catalyst demonstrates a record photoreduction rate of 8.01 mm h-1for h2O2generation and photooxidation rate of 3.75 mm h-1for furfuryl alcohol to furoic acid,achieving a remarkable solar-to-chemical conversion （SCC） efficiency of up to 2.27%.Experimental characterizations and DFT calculation disclosed that the introducing atomic Rb–N configurations allows for the high-selective generation of superoxide radicals while suppressing hydroxyl free radical *** is because the Rb–N serves as the new alternative site to perceive a stronger connection position for O2adsorption and reinforce the capability to extract protons,thereby triggering a high selective redox product *** study holds great potential in precisely regulating reactive radical processes at the atomic level,thereby paving the way for efficient synthesis of h2O2coupled with biomass valorization.

关键词： Free radical reactions

Si-C Foam Porous-medium Combustion Power-Generation System for Low-Calorific-Value Biomass Syngas

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Journal of Thermal Science 2025年第1期34卷 206-222页

作者： YANG Jianwen chen Wei CAO Bingwei LIU Xinhui LI hang College of mechanical and Aerospace Engineering Jilin University School of mechanical and Vehicle Engineering Changchun University

Syngas produced from the gasification of organic feedstocks from biomass is one of the clean and sustainable sources of *** advantages of simple access and renewability of biomass energy can meet the energy needs of temporary power *** study presents a biomass power-generation system for vehicular *** biomass and a free-piston Stirling engine generator（FPSEG） as the primary material and prime mover,respectively,biomass energy is converted into electricity by combusting the syngas to heat the *** and key parameter design for biomass gasification and thermoelectric conversion systems within a power generation system were performed.A porous medium area was constructed using Si-C foam ceramics to obtain an energy-conversion experimental *** effects of bed height,porosity,porous-region diameter,and air-intake conditions on the power-generation performance were investigated,and optimisations were performed for the thermoelectric conversion *** rate of increase during FPSEG power generation first increased and then decreased with increasing bed height,peaking at a bed height of 40 *** increasing porous-region diameter accelerated FPSEG power generation,whereas porosity changes in the porous media did not significantly affect the rate of change during FPSEG power *** increasing air intake,the rate of increase during power generation first increased and then *** maximum change rate and the highest thermoelectric conversion efficiency of the power-generation system occurred at 9.5 m3/h and 6.5 m3/h（～45.1%）air intakes,*** the thermal inertia and combustion structure of the thermoelectric conversion system significantly increased the power-generation rate of the system,with 1.8 W/s being observed at a 9.7 m3/h air intake.

关键词： biomass combined heat and power (ChP) gasification porous media combustion power generation