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海南黄牛肉质特性研究

畜牧与兽医 2024年第2期56卷 22-25页

作者：汪刘浩燕雪豪吴科榜那威海南大学热带农林学院海南海口570228

为研究海南黄牛的肉质特性,共采集10头海南黄牛的12~13肋骨间背最长肌,测定其剪切力、滴水损失率、解冻失水率、pH值、水分含量、灰分含量、粗蛋白含量、粗脂肪含量、氨基酸含量和脂肪酸含量。结果显示:海南黄牛肌肉剪切力为(41.54±15.... 详细信息

为研究海南黄牛的肉质特性,共采集10头海南黄牛的12~13肋骨间背最长肌,测定其剪切力、滴水损失率、解冻失水率、pH值、水分含量、灰分含量、粗蛋白含量、粗脂肪含量、氨基酸含量和脂肪酸含量。结果显示:海南黄牛肌肉剪切力为(41.54±15.82)N,解冻失水率为(2.82±0.10)%,滴水损失率为(2.29±0.48)%,pH45 min值和pH24 h值分别为6.86±0.33和6.27±0.38;海南黄牛肌肉水分含量为(73.92±1.33)%,灰分含量为(1.12±0.08)%,粗蛋白含量为(23.66±1.16)%,粗脂肪含量仅为(1.12±0.20)%。海南黄牛肌肉中共检测到16种氨基酸,每100 g母牛肉含必需氨基酸(9.84±0.32)g,每100 g公牛肉含必需氨基酸(9.38±0.21)g,非必需氨基酸中谷氨酸含量最高。海南黄牛肌肉中共测得15种脂肪酸,月桂酸仅在公牛上测得,棕榈酸、硬脂酸和油酸是主要脂肪酸组成,其中油酸占比最高,母牛肉中油酸含量约为34.03%,公牛约为27.46%。海南黄牛肉鲜嫩且富含蛋白质,氨基酸与脂肪酸组成丰富,具有较强的系水能力,营养价值较高。

关键词：海南黄牛肉质特性营养成分氨基酸脂肪酸

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硼酸酯基自修复聚氨酯木材涂料制备与性能

林业工程学报 2024年第3期9卷 54-60页

作者：许睿王鼎窦柳皓崔举庆何磊冯富奇刘方方南京林业大学材料科学与工程学院南京210037

涂层在长期使用过程中容易受到损伤而产生微小裂纹,暴露在空气、水分和盐分等介质中会加速微裂纹的扩散,使得涂料的防护性能和美观性能显著下降,而具备自修复能力的涂层能够延长涂层的使用寿命。首先以二乙醇胺(DEA)和四羟甲基苯硼酸(HP... 详细信息

涂层在长期使用过程中容易受到损伤而产生微小裂纹,暴露在空气、水分和盐分等介质中会加速微裂纹的扩散,使得涂料的防护性能和美观性能显著下降,而具备自修复能力的涂层能够延长涂层的使用寿命。首先以二乙醇胺(DEA)和四羟甲基苯硼酸(HPBA)为原料制备一端氨基一端羟基的含氮硼内配位的硼酸酯键化合物(NCBC),并将NCBC与二苯基甲烷二异氰酸酯(MDI)反应制备了两端羟基封端的含硼酸酯键化合物(MN);然后以聚四氢呋喃(PTMEG-1000)和MDI为原料,MN为扩链剂制备了自修复聚氨酯(PU)及其涂料。元素分析、核磁共振氢谱和傅里叶变换红外光谱分析证明成功制备了NCBC和MN化合物,NCBC具有较好的耐水性能。试验结果表明:聚氨酯引入MN(n(MDI)∶n(NCBC)=1∶2.0)扩链剂,自修复PU的拉伸强度为6.06 MPa,修复后拉伸强度为5.47 MPa,自修复效率为90.2%。木材表面聚氨酯漆膜的铅笔硬度高达3H,附着力为0级,耐冲击性大于50 cm,柔韧性为2 mm,表面划痕在60℃条件下修复12 h后完全愈合,表明自修复聚氨酯漆膜具备良好的自愈合性能。

关键词：自修复聚氨酯涂料硼酸酯键力学性能

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一种稀土铕配合物的合成及其发光性能研究

云南化工 2024年第2期51卷 55-57页

作者：陈柳豪丁正松刘丰祎云南师范大学化学化工学院云南昆明650500

以2,6-吡啶二羧酸(2,6-H 2pdc)、β-苯乙胺(PEA)和稀土离子Eu(Ⅲ)为原料,采用溶剂挥发法在室温下制备了一种新型的Eu(2,6-Hpdc)_(3)(H_(2)O)_(2)(PEA)_(2)晶体。采用单晶X射线衍射、XRD、TGA、荧光光谱等方法对所制备的配合物进行了表... 详细信息

以2,6-吡啶二羧酸(2,6-H 2pdc)、β-苯乙胺(PEA)和稀土离子Eu(Ⅲ)为原料,采用溶剂挥发法在室温下制备了一种新型的Eu(2,6-Hpdc)_(3)(H_(2)O)_(2)(PEA)_(2)晶体。采用单晶X射线衍射、XRD、TGA、荧光光谱等方法对所制备的配合物进行了表征和分析。结果表明晶体数据的模拟衍射图与实验测得的粉末X射线高度吻合,证实合成的样品具有很好的相纯度。热重分析结果表明该配合物具有良好的热稳定性。Eu 3+配合物的荧光光谱表明,配合物具有稳定而强的发光特性。利用该配合物在酸碱蒸汽中的荧光开/关特性,制备了一种具有防伪效果的墨水,表明该类配合物在防伪领域具有潜在的应用前景。

关键词： 2,6-吡啶二羧酸稀土铕配合物防伪晶体

NET IMPACT OF PHYSICAL INTERACTION MECHANISMS IN A COUPLED WAVE-TIDE-SURGE MODEL

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Journal of Hydrodynamics 2004年第5期16卷 615-620页

作者： YINBao-shu liuhao LINXiang HOUYi-jun CHENGMing-hua YANGDe-zhou WILLPetrie InstituteofOceanology ChineseAcademyofSciencesQingdao266071China InstituteofOceanology ChineseAcademyofSciencesQingdao266071China／／GraduateSchooloftheChineseAcademyofSciencesBeijing10039China TrafficandOceanEngineeringcollege HoHaiUniversityNanjing210098China InstituteofOceanology ChineseAcademyofSciencesQingdao266071China InstituteofOceanology ChineseAcademyofSciencesQingdao266071China／／GraduateSchooloftheChineseAcademyofSciencesBeijing100039China FisheriesandOceansCanada BedfordInstituteofOceanographyDartmouthNovaScotiaCanada

The focus of this study is a coastal high-resolution (2′ X 2′ ) two-waycoupled wave-tide-surge interaction model, including three main physical mechanisms. Comparisons andanalysis of simulated and measured wave heights and sea level considered two moderate storm casesfor the Huang-he Delta coastal area. The effects of different physical mechanisms on wave heightsare mainly influenced by wave-current interaction, including radiation stress. Wave-age dependentsurface wind stress and radiation stress mechanisms in the coupling wave-tide-surge interactionmodel show positive impact on sea level, and the wave-current interaction bottom stress mechanismshows negative impact on seal level. The comprehensive effects of the three main physical mechanismsshow positive net impact on seal level and increase sea level by around 20cm for the stormsconsidered. Overall, the results we show that the wave heights and sea levels simulated by thecoupled wave-tide-surge model agree better with the measured values than uncoupled model results,particularly for peak storm conditions.

关键词： coupled model physical mechanisms net impact coastal area

Base-or acid-assisted polystyrene plastic degradation in supercritical CO_(2)

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Waste Disposal and Sustainable Energy 2023年第2期5卷 165-175页

作者： Yanbing Liu Jinwen Shi liuhao Mao Bingru Lu Xing Kang Hui Jin International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong University28 West Xianning RoadXi’an710049ShaanxiChina

Plastic has caused serious"white pollution"to the environment,and the highly inert characteristics of plastic bring a major challenge for *** fluids have unique physical properties and have been widely used in various *** this work,supercritical CO_(2)(Sc-CO_(2))with mild conditions was selected and assisted by NaOH/HCl solution to degrade polystyrene(PS)plastic,and the reaction model was designed using response surface methodology(RSM).It was found that,regardless of the types of assistance solutions,the factors affecting PS degradation efficiencies were reaction temperature,reaction time,and NaOH/HCl *** the temperature of 400℃,time of 120 min,and base/acid concentration of 5%(in weight),0.15 g PS produced 126.88/116.99±5 mL of gases with 74.18/62.78±5 mL of H2,and consumed 81.2/71.5±5 mL of CO_(2).Sc-CO_(2)created a homogeneous environment,which made PS highly dispersed and uniformly heated,thus promoting the degradation of ***,Sc-CO_(2)also reacted with the degradation products to produce new CO and more CH_(4)and C_(2)H_(x)(x=4,6).Adding NaOH/HCl solution not only improved the solubility of PS in Sc-CO_(2),but also provided a base/acid environment that reduced the activation energy of the reaction,and effectively improved the degradation efficiencies of *** short,degrading PS in Sc-CO_(2)is feasible,and better results are obtained with the assistance of base/acid solution,which can provide a reference for the disposal of waste plastics in the future.

关键词： Plastic degradation Polystyrene Supercritical CO_(2) NaOH HCl

Regulation on polymerization degree and surface feature in graphitic carbon nitride towards efficient photocatalytic H2 evolution under visible-light irradiation

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Journal of Materials Science & Technology 2022年第3期98卷 160-168页

作者： Cheng Cheng Chung-Li Dong Jinwen Shi liuhao Mao Yu-Cheng Huang Xing Kang Shichao Zong Shaohua Shen International Research Center for Renewable Energy(IRCRE) State Key Laboratory of Multiphase Flow in Power Engineering(MFPE)Xi'an Jiaotong University(XJTU)28 West Xianning RoadXi’an 710049China Department of Physics Tamkang University151 Yingzhuan RoadTamsui 25137TaiwanChina

A kind of graphitic carbon nitride(TSC-550) with high polymerization degree and improved surface property was prepared by a new precursor of thiosemicarbazide. The sulfur motif and high nitrogen content in thiosemicarbazide promoted the polymerization of thiosemicarbazide to form graphitic carbon nitride framework with high degree of polymerization, which significantly influenced the electronic structure and surface chemical properties. TSC-550 possessed a narrow bandgap of 2.19 eV that facilitated the utilization of visible light, and possessed a less positive charge, acidic surface that resulted in enhanced hydrogen adsorption ability in water solution, which promoted the H;evolution kinetics. In addition, the extended π-conjugated electronic system promoted the separation and migration of photogenerated charge carries in plane of TSC-550 framework, as well as the increasing interlayer C–N interactions in TSC-550 created conductive paths across the layers to tunnel interlayers for rapid electron transportation. As a result, TSC-550 nanosheets showed excellent photocatalytic H;production activity,the AQY achieved 36.4% at 425 nm.

关键词： Degree of polymerization Graphitic carbon nitride Photocatalysis Solar energy Hydrogen

Analysis and Implementation of Traffic Buffering in EOS Chip Design

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Semiconductor Photonics and Technology 2005年第1期11卷 12-15页

作者： FENGBo liuhao YINYan-fen WuhanResearchInstituteofPostsandTelecommunications Wuhan430074CHN

The traffic buffering problems in the ethernet over synchronous digital hierarchy(EOS) are introduced and analyzed. Different solutions are also presented in detail. Synchronous DRAM(SDRAM) is used as off-chip buffer to store-and-retransmission ethernet frames. A new and easy control design is introduced here. The buffer area size on chip is greatly reduced and the power dissipation is lowed at the same time.

关键词： Buffering Bank Ethernet SDRAM SDH EOS Timing

大学生结构设计竞赛中空间杆系结构力学特性分析

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山西建筑 2024年第14期50卷 60-64,106页

作者：朱刘豪桂泽宇宋秋杰程娴张广春陈震柴燕江汉大学数字建造与爆破工程学院湖北武汉430056

针对历年大学生结构设计竞赛中空间杆系结构的赛题,以复压竹皮和竹杆为原材料设计空间杆系结构并进行其结构形式分析。利用有限元软件MIDAS Gen建模和计算,对系列空间杆系结构在多种荷载工况下的应力和位移进行数值模拟仿真,分析其承载... 详细信息

针对历年大学生结构设计竞赛中空间杆系结构的赛题,以复压竹皮和竹杆为原材料设计空间杆系结构并进行其结构形式分析。利用有限元软件MIDAS Gen建模和计算,对系列空间杆系结构在多种荷载工况下的应力和位移进行数值模拟仿真,分析其承载能力和变形特征,总结出空间杆系结构在荷载组合工况下的强度、变形等力学特性以及结构优化的有效措施。

关键词：结构设计竞赛空间杆系结构力学特性有限元分析 MIDAS Gen

Multidimensional optical tweezers synthetized by rigid-body emulated structured light

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Photonics Research 2023年第9期11卷 1524-1534页

作者： liuhao ZHU YUPING TAI HEHE LI HUAJIE HU XINZHONG LI YANGJIAN CAI YIJIE SHEN School of Physics and Engineering Henan University of Science and TechnologyLuoyang 471023China State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China Shandong Provincial Engineering and Technical Center of Light Manipulations and Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250014China Joint Research Center of Light Manipulation Science and Photonic Integrated Chip of East China Normal University and Shandong Normal University East China Normal UniversityShanghai 200241China Optoelectronics Research Centre University of SouthamptonSouthampton SO171BJUK Centre for Disruptive Photonic Technologies School of Physical and Mathematical Sciences and The Photonics InstituteNanyang Technological UniversitySingapore 637378Singapore

Structured light with more extended degrees of freedom(DoFs)and in higher dimensions is increasingly gaining traction and leading to breakthroughs such as super-resolution imaging,larger-capacity communication,and ultraprecise optical trapping or *** DoFs for manipulating an object can access more maneuvers and radically increase maneuvering precision,which is of significance in biology and related microscopic ***,manipulating particles beyond three-dimensional(3D)spatial manipulation by using current all-optical tweezers technology remains *** overcome this limitation,we theoretically and experimentally present six-dimensional(6D)structured optical tweezers based on tailoring structured light emulating rigid-body *** method facilitates the evaluation of the methodology of rigid-body mechanics to synthesize six independent DoFs in a structured optical trapping system,akin to six-axis rigid-body manipulation,including surge,sway,heave,roll,pitch,and *** contrast to previous 3D optical tweezers,our 6D structured optical tweezers significantly improved the flexibility of the path design of complex trajectories,thereby laying the foundation for next-generation functional optical manipulation,assembly,and micromechanics.

关键词： rigid trapping breakthrough