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铈铽激活硼酸镁的光致发光

中国稀土学报 1987年第2期 15-20页

作者：郭凤瑜林海北京大学化学系北京大学化学系

研究了组成、温度对铈铽激活硼酸镁的发光亮度、发射光谱和激发光谱的影响。结果表明,在254nm紫外光激发下,铈对铽的发射起良好的敏化作用,能量传递的机理为共振传递。在20～200℃范围内,铈和铽的发射强度随温度的上升而下降。

关键词：光致发光能量传递硼酸镁激发光谱相对亮度紫外光激发敏化作用激发带发射强度离子发光

不同比重布比卡因腰硬联合麻醉在老年下肢骨科手术中麻醉效果对比分析

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上海医药 2016年第23期37卷 45-47,51页

作者：周力克林逢雨萍乡湘雅萍矿合作医院麻醉科萍乡337003 南昌大学医学院南昌330038

目的 :对比分析不同比重布比卡因腰硬联合麻醉应用于老年下肢骨科手术的麻醉效果。方法 :选取我院行下肢骨科手术的老年患者96例,随机分为A、B、C 3组各32例。A、B和C组分别行重、等和轻比重布比卡因麻醉,比较3组患者的麻醉效果。结果 :... 详细信息

目的 :对比分析不同比重布比卡因腰硬联合麻醉应用于老年下肢骨科手术的麻醉效果。方法 :选取我院行下肢骨科手术的老年患者96例,随机分为A、B、C 3组各32例。A、B和C组分别行重、等和轻比重布比卡因麻醉,比较3组患者的麻醉效果。结果 :3组患者达最高阻滞平面时间比较差异无统计学意义(P>0.05);患者感觉阻滞起效时间依次为A组

关键词：骨科手术布比卡因腰硬联合麻醉下肢

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《秘传内府经验女科》学术特点钩玄

四川中医 2021年第5期39卷 15-17页

作者：林枫毓庄锦源徐小雯易玮广州中医药大学针灸康复临床医学院广东广州510006

《秘传内府经验女科》是清代吴悔庵篡辑的一部女科专著,分五卷对妇人经、带、胎、产的生理病理进行了比较详细的阐述。其学源经典,博采众长;辨证论证,脉证互参;调和阴阳,重视心脾;善用四物,崇尚生化;注重内服,兼用外治等学术特点对后学... 详细信息

《秘传内府经验女科》是清代吴悔庵篡辑的一部女科专著,分五卷对妇人经、带、胎、产的生理病理进行了比较详细的阐述。其学源经典,博采众长;辨证论证,脉证互参;调和阴阳,重视心脾;善用四物,崇尚生化;注重内服,兼用外治等学术特点对后学有所启迪,值得进一步探讨和研究。

关键词：秘传内府经验女科学术特点吴悔庵

Sulfur-encapsulated in heteroatom-doped hierarchical porous carbon derived from goat hair for high performance lithium–sulfur batteries

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Journal of Energy Chemistry 2019年第3期28卷 121-131页

作者： Juan Ren Yibei Zhou Huali Wu fengyu Xie Chenggang Xu Dunmin lin College of Chemistry and Materials Science Sichuan Normal University

Biomass-derived carbon materials have aroused widespread concern as host material of sulfur to enhance electrochemical performances for lithium–sulfur batteries. Herein, goat hair, as a low-cost and eco-friendly precursor, is employed to fabricate cauliflower-like in-situ nitrogen, oxygen and phosphorus tri-doped porous biomass carbon(NOPC) by a facile activation with H_3PO_4 and carbonization *** morphology and microstructure of NOPC can be readily tuned by altering pyrolysis temperature. The as-prepared NOPC matrix material carbonized at 600 °C possesses 3D hierarchical porous structure, high specific surface area(535.352 m^2 g^(-1)), and appropriate pore size and pore size distribution. Encapsulating sulfur into the NOPC depends on a stem-melting technology as cathode materials of Li–S batteries. Due to the synergistic effect of special physical structure and inherent tri-doping of N, O and P, electrons and ions transfer and utilization of active sulfur in the materials are improved, and the shuttle behaviors of soluble lithium polysulfides are also mitigated. Consequently, the S/NOPC-600 composite exhibits excellent electrochemical performance, giving a high initial discharge capacity of 1185 mA h g^(-1) at 0.05 C and maintaining a relatively considerable capacity of 489 m A h g^(-1) at 0.2 C after 300 cycles. Our work shows that a promising candidate for cathode material of Li–S batteries can be synthesized using low-cost and renewable biomass materials by a facile process.

关键词： Biomass-derived carbon materials Goat hair Nitrogen Oxygen and phosphorus tri-doping Lithium sulfur batteries

Deep Learning-Assisted Visualized Fluorometric Sensor Array for Biogenic Amines Detection

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Chinese Journal of Chemistry 2022年第5期40卷 609-616页

作者： Xiaoqing Tan Yingying Ye Hong Liu Jianxin Meng lin-lin Yang fengyu Li College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and ApplicationsJinan UniversityGuangzhouGuangdong510632 China Department of Pediatrics Guangdong Women and Children HospitalGuangzhouGuangdong510000 China

Biogenic amines(BAs)are important biomarkers for monitoring food quality and assisting in the diagnosis of ***,portable,accurate and high-throughput BAs detection is still challenging by the specific sensor compounds development or the complicated instrument *** learning(DL)algorithms are blooming for their superiority on the nonlinear and multidimensional data analysis,which endow the great advantage for the artificial intelligence assisted large sample analysis of the environmental or daily health *** this work,we developed a deep learning-assisted visualized fluorometric array-based sensing *** commercial fluorescent dyes were selected and combined into sensor *** in the alkalinity of BAs causes significant and distinct fluorescence changes of the *** conjunction with pattern recognition by the pretrained CNN models,the sensor array clearly differentiates seven BAs with 99.29%prediction accuracy and allows rapid single and multi-component quantification with a volume fraction range from 200 cm^(3)/m^(3)to 2500 cm^(3)/m^(3).This method also provides a new way for meat freshness *** envision that this novel analytical method for BAs can be used as an alternative and promising tool for the detection of a wider variety of analytes.

关键词： Deeplearning Convolutional neural network Sensors Fluorescencel Amines

Fast Computation of Sparse Data Cubes with Constraints

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Wuhan University Journal of Natural Sciences 2004年第2期9卷 167-172页

作者： fengyu-cai ChenChang-qing FengJian-lin XiangLong-gang SchoolofComputerScienceandTechnology HuazhongUniversityofScienceandTechnologyWuhan430074HubeiChina

For a data cube there are always constraints between dimensions or among attributes in a dimension, such as functional dependencies. We introduce the problem that when there are functional dependencies, how to use them to speed up the computation of sparse data cubes. A new algorithm CFD (Computation by Functional Dependencies) is presented to satisfy this demand. CFD determines the order of dimensions by considering cardinalities of dimensions and functional dependencies between dimensions together, thus reduce the number of partitions for such dimensions. CFD also combines partitioning from bottom to up and aggregate computation from top to bottom to speed up the computation further. CFD can efficiently compute a data cube with hierarchies in a dimension from the smallest granularity to the coarsest one. Key words sparse data cube - functional dependency - dimension - partition - CFD CLC number TP 311 Foundation item: Supported by the E-Government Project of the Ministry of Science and Technology of China (2001BA110B01)Biography: Feng Yu-cai (1945-), male, Professor, research direction: database system.

关键词： sparse data cube functional dependency dimension partition CFD

Experimental Investigation on Macro Spray Characteristics of Octanol-Biodiesel-Diesel Ternary Fuel Blend

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China Petroleum Processing & Petrochemical Technology 2023年第4期25卷 1-15页

作者： Tian Junjian Qiu Zhicong Zhao Lifei Li fengyu Hu Peng lin Qizhao Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Compressor Technology Hefei General Machinery Research Institute Co.Ltd.Hefei 230031China

This study investigates the spray characteristics of ternary blends composed of octanol, biodiesel, and diesel *** are conducted using six materials to examine the variation in spray characteristic and to verify and compare a previously established spray tip penetration model with a modified model. The results show that the addition of OB100(30%of octanol, 70% of biodiesel) improves the spray characteristics of the fuel. Specifically, the addition of 10% or 20% of OB100 leads to a slight increase in the spray tip penetration, average spray cone angle, maximum spray width, and the spray area of the fuel blend;however, further addition of OB100 causes a corresponding decrease in these parameters. Based on previous research, this study uses kinematic viscosity instead of dynamic viscosity and density to modify the prediction model of spray tip penetration. The modified model exhibits a better fit quality and agreement with the experimental data,making it more suitable for predicting the spray tip penetration of fuel blends compared to the Hiroyasu-Arai model.

关键词： octanol biodiesel ternary fuel blend maximum spray width modified model

Effects of Blending Long-Chain Alcohols with Jet Fuel on the Macroscopic Spray Characteristics

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China Petroleum Processing & Petrochemical Technology 2019年第4期21卷 49-57页

作者： Li fengyu Liu Yanju Huang Qifu Fu Wei Shi Weidong lin Qizhao Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefei 230026 Beijing Mechanical Equipment Institute Beijing100854

Long-chain alcohols were considered to be promising alternative fuels and fuel additives. This study was aimed at figuring out the influences of blending long-chain alcohols with jet fuel on the macroscopic spray characteristic. n-Butanol and n-pentanol were chosen as tested alternative fuels. A common-rail injection system was used to create high-pressure injection conditions. The Schlieren imaging system was used to capture spray processes. Results showed that with the addition of long-chain alcohols, the spray tip penetration and the peak spray tip velocity increased, whereas the spray cone angle and the spray area decreased. Comparisons between those macroscopic spray characteristics of AKB blends and AKP blends were also conducted. Compared to AKB blends, AKP blends showed similar spray tip penetration, larger peak tip velocity, smaller spray cone angle, and smaller spray area.

关键词： macroscopic spray characteristics jet fuel n-butanol n-pentanol common-rail system

Reductive amination of 1,6-hexanediol with Ru/Al2O3 catalyst in supercritical ammonia

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Science China Chemistry 2017年第7期60卷 920-926页

作者： Yan Li Haiyang Cheng Chao Zhang Bin Zhang Tong Liu Qifan Wu Xinluona Su Weiwei lin fengyu Zhao State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Laboratory of Green Chemistry and Process Changchun Institute of Applied ChemistryChinese Academy of Sciences Changchun 130022China Department of Environmental Science and Engineering Heilongfiang UniversityHarbin 150080China

Hexamethylenediamine(HMDA) is an important reagent for the synthesis of Nylon-6,6, and it is usually produced by the hydrogenation of adiponitrile using a toxic reagent of hydrocyanic acid. Herein, we developed an environmental friendly route to produce HMDA via catalytic reductive amination of 1,6-hexanediol(HDO) in the presence of hydrogen. The activities of several heterogeneous metal catalysts such as supported Ni, Co, Ru, Pt, Pd catalysts were screened for the present reaction in supercritical ammonia without any additives. Among the catalysts examined, Ru/Al_2O_3 presented a high catalytic activity and highest selectivity for the desired product of HMDA. The high performance of Ru/Al_2O_3 was discussed based on the Ru dispersion and the surface properties like the acid-basicity. In addition, the reaction parameters such as reaction temperature,time, H_2 and NH_3 pressure were examined, and the reaction processes were discussed in detail.

关键词： 1 6-hexanediol hexamethylenediamine supercritical ammonia reductive amination Ru/Al2O3