以南美白对虾为研究对象,对超高压联合真空低温烹饪冻干虾(sous-vide combined with high pressure cooked and freeze-dried shrimp,SPF)与传统热加工技术制备的高温熟制风干虾(boiled and hot air dried shrimp,BH)的品质进行研究。...以南美白对虾为研究对象,对超高压联合真空低温烹饪冻干虾(sous-vide combined with high pressure cooked and freeze-dried shrimp,SPF)与传统热加工技术制备的高温熟制风干虾(boiled and hot air dried shrimp,BH)的品质进行研究。结果表明,与BH相比,SPF的硬度较低,颜色较饱满,感官评分较高,更受消费者喜爱。检测挥发性香味物质发现,SPF中的苯甲醛含量显著高于BH,SPF更具有海鲜风味。在脂肪酸含量上,SPF中多不饱和脂肪酸含量高于BH。同时,通过货架期动力学模型建立得到SPF氧化稳定性较高。因此,超高压联合真空低温烹饪技术制备即食虾可以更好地改善即食虾的品质和风味,实验结果为规模化生产高品质、风味独特且方便食用的即食虾提供了理论基础。展开更多
Phosphate was removed from aqueous environment by corundum-hollow-spheres supported caclined hydrotalcite (cHT) thin films. Mg-Al-CO3 hydrotalcite (HT) thin films were deposited on corundumhollow-sphere substrates by ...Phosphate was removed from aqueous environment by corundum-hollow-spheres supported caclined hydrotalcite (cHT) thin films. Mg-Al-CO3 hydrotalcite (HT) thin films were deposited on corundumhollow-sphere substrates by hydrothermal homogeneous precipitation at 120℃for 30-240 min and cHT thin films were obtained by annealing of the HT thin films at 500℃for 180 min. Their crystal phase, morphology and microstructure were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).The results show that homogeneous, well-crystallized and hierarchical flower-like thin films were deposited firmly on the surface of the corundum. The mechanism of nucleation and growth of the HT thin films was fitted well with the anion coordination polyhedron growth unit model. To determine the absorption of phosphate by this adsorbent, different bed depth (10-30 cm) and flow rate (1.0-3.0 m L/min) were examined by column experiments. The highest removal efficiency of phosphate amounted to 98.5%under optimum condition (pH=7.2). The adsorption capacity increased as the bed depth increased and decreased as the flow rate increased.展开更多
Holographic multiple-input multiple-output(HMIMO)has become an emerging technology for achieving ultra-high frequency spectral efficiency and spatial resolution in future wireless systems.The increasing antenna apertu...Holographic multiple-input multiple-output(HMIMO)has become an emerging technology for achieving ultra-high frequency spectral efficiency and spatial resolution in future wireless systems.The increasing antenna aperture leads to a more significant characterization of the spherical wavefront in near-field communications in HMIMO scenarios.Beam training as a key technique for wireless communication is worth exploring in this near-field scenario.Compared with the widely researched far-field beam training,the increased dimensionality of the search space for near-field beam training poses a challenge to the complexity and accuracy of the proposed algorithm.In this paper,we introduce several typical near-field beam training methods:exhaustive beam training,hierarchical beam training,and multi-beam training that includes equal interval multi-beam training and hash multi-beam training.The performances of these methods are compared through simulation analysis,and their effectiveness is verified on the hardware testbed as well.Additionally,we provide application scenarios,research challenges,and potential future research directions for near-field beam training.展开更多
目的:通过网络药理学和分子对接初步揭示了青黛抗2型糖尿病的作用机制。方法:从中药系统药理学数据库与分析平台(TCMSP)中根据吸收和代谢情况选出青黛的有效成分及成分所对应的靶点,将靶点转换成对应的基因,取青黛和2型糖尿病的交集基因...目的:通过网络药理学和分子对接初步揭示了青黛抗2型糖尿病的作用机制。方法:从中药系统药理学数据库与分析平台(TCMSP)中根据吸收和代谢情况选出青黛的有效成分及成分所对应的靶点,将靶点转换成对应的基因,取青黛和2型糖尿病的交集基因做PPI蛋白互作网络图,通过David数据库进行基因本体(GO)和京都基因与基因组百科全书(KEGG)分析,最后采用分子对接验证。结果:筛选得到青黛的活性成分9个、交集基因204个,通过蛋白互作分析发现“STAT3、JUN、MAPK3”可能有治疗2型糖尿病的作用,KEGG富集发现,且可能通过positive regulation of transcription from RNA polymerase II promotor、response to drug、positive regulation of gene expression等信号通路进行调控。分子对接结果表明青黛中的Bisindigotin、Indican、Isovitexin等活性成分与“STAT3、JUN、MAPK3”有比较强的结合能力。结论:青黛可能是通过Bisindigotin、Indican、Isovitexin等成分调控positive regulation of transcription from RNA polymerase II promotor等相关信号通路上的STAT3、JUN、MAPK3等基因发挥治疗2型糖尿病的作用。展开更多
为合理评价多孔沥青混合料内部细观结构与其性能的关系,应用有限元软件ABAQUS和蒙特卡洛法(Monte Carlo method),把多孔沥青混合料看作空隙和非空隙组成的二相体,考虑各相组分,建立了单轴压缩试验模拟所需的2D空隙模型,分析多孔沥青混...为合理评价多孔沥青混合料内部细观结构与其性能的关系,应用有限元软件ABAQUS和蒙特卡洛法(Monte Carlo method),把多孔沥青混合料看作空隙和非空隙组成的二相体,考虑各相组分,建立了单轴压缩试验模拟所需的2D空隙模型,分析多孔沥青混合料的力学性能与其空隙的分布形态的关系,通过比较不同空隙形状的模型,观察其应力应变特性,得到多孔沥青混合料细观结构内部的损伤规律及其受力特点,即随着空隙边数或棱数的减少,变形增大;比较不同空隙直径范围的模型,观察其应力应变特性,得到多孔沥青混合料细观结构内部的损伤规律及其受力特点,即随着空隙直径范围的增大,多孔沥青混合料的变形增大;对比空隙形状、尺寸、空隙率不同的多孔沥青混合料细观模型变形及力学性能,从中得到力学性能较好的空隙模型,即空隙形状为二十边形,空隙直径范围为3~4 mm,空隙率为18%的多孔沥青混合料细观模型。展开更多
文摘以南美白对虾为研究对象,对超高压联合真空低温烹饪冻干虾(sous-vide combined with high pressure cooked and freeze-dried shrimp,SPF)与传统热加工技术制备的高温熟制风干虾(boiled and hot air dried shrimp,BH)的品质进行研究。结果表明,与BH相比,SPF的硬度较低,颜色较饱满,感官评分较高,更受消费者喜爱。检测挥发性香味物质发现,SPF中的苯甲醛含量显著高于BH,SPF更具有海鲜风味。在脂肪酸含量上,SPF中多不饱和脂肪酸含量高于BH。同时,通过货架期动力学模型建立得到SPF氧化稳定性较高。因此,超高压联合真空低温烹饪技术制备即食虾可以更好地改善即食虾的品质和风味,实验结果为规模化生产高品质、风味独特且方便食用的即食虾提供了理论基础。
基金Supported by the Major Program of the Ministry of Education of the People’s Republic of China。
文摘Phosphate was removed from aqueous environment by corundum-hollow-spheres supported caclined hydrotalcite (cHT) thin films. Mg-Al-CO3 hydrotalcite (HT) thin films were deposited on corundumhollow-sphere substrates by hydrothermal homogeneous precipitation at 120℃for 30-240 min and cHT thin films were obtained by annealing of the HT thin films at 500℃for 180 min. Their crystal phase, morphology and microstructure were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).The results show that homogeneous, well-crystallized and hierarchical flower-like thin films were deposited firmly on the surface of the corundum. The mechanism of nucleation and growth of the HT thin films was fitted well with the anion coordination polyhedron growth unit model. To determine the absorption of phosphate by this adsorbent, different bed depth (10-30 cm) and flow rate (1.0-3.0 m L/min) were examined by column experiments. The highest removal efficiency of phosphate amounted to 98.5%under optimum condition (pH=7.2). The adsorption capacity increased as the bed depth increased and decreased as the flow rate increased.
文摘Holographic multiple-input multiple-output(HMIMO)has become an emerging technology for achieving ultra-high frequency spectral efficiency and spatial resolution in future wireless systems.The increasing antenna aperture leads to a more significant characterization of the spherical wavefront in near-field communications in HMIMO scenarios.Beam training as a key technique for wireless communication is worth exploring in this near-field scenario.Compared with the widely researched far-field beam training,the increased dimensionality of the search space for near-field beam training poses a challenge to the complexity and accuracy of the proposed algorithm.In this paper,we introduce several typical near-field beam training methods:exhaustive beam training,hierarchical beam training,and multi-beam training that includes equal interval multi-beam training and hash multi-beam training.The performances of these methods are compared through simulation analysis,and their effectiveness is verified on the hardware testbed as well.Additionally,we provide application scenarios,research challenges,and potential future research directions for near-field beam training.
文摘目的:通过网络药理学和分子对接初步揭示了青黛抗2型糖尿病的作用机制。方法:从中药系统药理学数据库与分析平台(TCMSP)中根据吸收和代谢情况选出青黛的有效成分及成分所对应的靶点,将靶点转换成对应的基因,取青黛和2型糖尿病的交集基因做PPI蛋白互作网络图,通过David数据库进行基因本体(GO)和京都基因与基因组百科全书(KEGG)分析,最后采用分子对接验证。结果:筛选得到青黛的活性成分9个、交集基因204个,通过蛋白互作分析发现“STAT3、JUN、MAPK3”可能有治疗2型糖尿病的作用,KEGG富集发现,且可能通过positive regulation of transcription from RNA polymerase II promotor、response to drug、positive regulation of gene expression等信号通路进行调控。分子对接结果表明青黛中的Bisindigotin、Indican、Isovitexin等活性成分与“STAT3、JUN、MAPK3”有比较强的结合能力。结论:青黛可能是通过Bisindigotin、Indican、Isovitexin等成分调控positive regulation of transcription from RNA polymerase II promotor等相关信号通路上的STAT3、JUN、MAPK3等基因发挥治疗2型糖尿病的作用。
文摘为合理评价多孔沥青混合料内部细观结构与其性能的关系,应用有限元软件ABAQUS和蒙特卡洛法(Monte Carlo method),把多孔沥青混合料看作空隙和非空隙组成的二相体,考虑各相组分,建立了单轴压缩试验模拟所需的2D空隙模型,分析多孔沥青混合料的力学性能与其空隙的分布形态的关系,通过比较不同空隙形状的模型,观察其应力应变特性,得到多孔沥青混合料细观结构内部的损伤规律及其受力特点,即随着空隙边数或棱数的减少,变形增大;比较不同空隙直径范围的模型,观察其应力应变特性,得到多孔沥青混合料细观结构内部的损伤规律及其受力特点,即随着空隙直径范围的增大,多孔沥青混合料的变形增大;对比空隙形状、尺寸、空隙率不同的多孔沥青混合料细观模型变形及力学性能,从中得到力学性能较好的空隙模型,即空隙形状为二十边形,空隙直径范围为3~4 mm,空隙率为18%的多孔沥青混合料细观模型。
