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柠檬酸钠辅助制备羟基磷灰石/明胶纳米复合材料

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陶瓷学报 2022年第4期43卷 667-673页

作者：李瑀喆武明晨谭军军湖北工业大学材料与化学工程学院湖北武汉430068 湖北工业大学绿色轻工材料湖北省重点实验室湖北武汉430068

采用柠檬酸钠辅助水热法,通过改变柠檬酸钠与钙离子摩尔比(CCR)制备了不同羟基磷灰石(HA)纳米颗粒。同时将所制备HA纳米颗粒通过溶液共混法与明胶复合制备HA/明胶复合材料。相关产物和复合材料通过XRD、Raman光谱、扫描电子显微镜、UV-... 详细信息

采用柠檬酸钠辅助水热法,通过改变柠檬酸钠与钙离子摩尔比(CCR)制备了不同羟基磷灰石(HA)纳米颗粒。同时将所制备HA纳米颗粒通过溶液共混法与明胶复合制备HA/明胶复合材料。相关产物和复合材料通过XRD、Raman光谱、扫描电子显微镜、UV-vis光谱和拉伸实验等进行分析表征。结果表明,CCR从0∶6提升到4∶6,HA颗粒平均长度从100.8 nm降至41.8 nm,平均直径从33.7 nm降至17.3 nm,HA颗粒在水介质中的表面电荷从−3.7 mV降至−33.0 mV。同时,随着CCR从0∶6提升到4∶6,HA/明胶复合材料的断裂伸长率、拉伸强度和杨氏模量从1.56%、45.3 MPa和3.24 GPa变为升至6.00%、77.7 MPa和4.57 GPa,HA/明胶复合材料的透明度从5%提升到55%。以上结果说明,CCR的提高不仅有利于HA颗粒尺寸的减小,而且还有利于HA颗粒在水介质中分散性的提升。颗粒的这些变化可以有效提升复合材料的力学性能。

关键词：羟基磷灰石明胶柠檬酸钠纳米复合材料透明度

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大数据时代假币犯罪治理难点及应对策略

江苏警官学院学报 2023年第6期38卷 89-98页

作者：谢全发吴茗晨江苏警官学院侦查系江苏省南京市公安局六合分局

大数据时代,假币犯罪形势依然严峻,犯罪分子的手段变得更加隐蔽。为了有效地应对这种新型假币犯罪,我们必须寻找新的治理途径。首先,我们需要深入分析假币犯罪的特点和危害,以及公安机关在打击这类犯罪时所遇到的困难。然后,利用大数据... 详细信息

大数据时代,假币犯罪形势依然严峻,犯罪分子的手段变得更加隐蔽。为了有效地应对这种新型假币犯罪,我们必须寻找新的治理途径。首先,我们需要深入分析假币犯罪的特点和危害,以及公安机关在打击这类犯罪时所遇到的困难。然后,利用大数据的应用优势,我们可以采取高端货币防伪技术、构建假币犯罪数据库、开发假币网上检测预警系统、创新反假币宣传教育等多种措施来提高防范和打击假币犯罪的效能。

关键词：大数据时代假币犯罪治理

不同品种抹茶营养物质和抗氧化活性的测定及主成分分析

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食品与发酵工业 2024年第2期50卷 239-246页

作者：邬刚马云龙徐铭辰潍坊工程职业学院基础教学部山东潍坊262500

为研究不同品种抹茶在相关基础理化指标、营养物质和抗氧化活性上的品质差异,以8种不同品种(国内5种,国外3种)抹茶为研究对象,系统地比较不同品种抹茶中水分、水浸出物、粒度(D60)、灰分、可溶性蛋白、可溶性糖、茶氨酸、茶多酚、儿茶... 详细信息

为研究不同品种抹茶在相关基础理化指标、营养物质和抗氧化活性上的品质差异,以8种不同品种(国内5种,国外3种)抹茶为研究对象,系统地比较不同品种抹茶中水分、水浸出物、粒度(D60)、灰分、可溶性蛋白、可溶性糖、茶氨酸、茶多酚、儿茶素类化合物、咖啡碱和体外抗氧化活性的差异,并通过主成分分析建立抹茶品质评价模型。主成分分析结果表明,共提取出2个主成分,累积方差贡献率可达82.5%。所有抹茶的水分、粒度(D60)和灰分均符合GB/T 34778—2017《抹茶》的要求。我国不同品种抹茶的水浸出物、可溶性蛋白、可溶性糖、茶氨酸、茶多酚、表没食子儿茶素没食子酸酯和咖啡碱含量均显著高于国外抹茶样品(P<0.05)。此外,“龙井43”品种抹茶的综合体外抗氧化活性最强,综合品质评分也最高。

关键词：抹茶营养物质抗氧化活性体能恢复理化特征主成分分析

Ballistic performances of the hourglass lattice sandwich structures under high-velocity fragments

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Defence Technology（防务技术） 2024年第1期31卷 312-325页

作者： He-xiang wu Jia Qu Lin-zhi wu Key Laboratory of Advanced Ship Materials and Mechanics College of Aerospace and Civil EngineeringHarbin Engineering UniversityHarbin150001China School of Civil Engineering Northeast Forestry UniversityHarbin150040China

In this paper,the numerical simulation method is used to study the ballistic performances of hourglass lattice sandwich structures with the same mass under the vertical incidence of *** is paid to elucidating the influences of rod cross-section dimensions,structure height,structure layer,and rod inclination angle on the deformation mode,ballistic performances,and ability to change the ballistic direction of *** results show that the ballistic performances of hourglass lattice sandwich structures are mainly affected by their structural *** this respect,structural parameters optimization of the hourglass lattice sandwich structures enable one to effectively improve their ballistic limit velocity and,consequently,ballistic performances.

关键词： Hourglass lattice sandwich structures Ballistic performances high-velocity Finite element analysis

Resilience-incorporated seismic risk assessment of precast concrete frames with“dry”connections

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Earthquake Engineering and Engineering Vibration 2024年第2期23卷 403-425页

作者： wu Chenhao Tang Yuchuan Cao Xuyang wu Gang Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education Nanjing 211102China Department of Civil and Environmental Engineering University of CaliforniaLos AngelesCA 90095USA School of Civil Engineering Southeast UniversityNanjing 211102China College of Civil and Transportation Engineering Hohai UniversityNanjing 210024China

A resilience-incorporated risk assessment framework is proposed and demonstrated in this study to manifest the advantageous seismic resilience of precast concrete frame(PCF)structures with“dry”connections in terms of their low damage and rapid *** framework integrates various uncertainties in the seismic hazard,fragility,capacity,demand,loss functions,and post-earthquake *** this study,the PCF structures are distinguished from ordinary reinforced concrete frame(RCF)structures by characterizing multiple limit states for the PCF based on its unique damage ***,probabilistic story-wise pushover analyses are performed to yield story-wise capacities for the predefined limit *** the seismic resilience analysis,a step-wise recovery model is proposed to idealize the functionality recovery process,with separate considerations of the repair and non-repair *** recovery model leverages the economic loss and downtime to delineate the stochastic post-earthquake recovery curves for the resilience loss *** such,contingencies in the probabilistic post-earthquake repairs are incorporated and the empirical judgments on the recovery parameters are largely *** proposed framework is demonstrated through a comparative study between two“dry”connected PCFs and one RCF designed as alternative structural systems for a prototype *** results from the risk quantification indicate that the PCFs show reduced loss hazards and lower expected losses relative to the ***,the PCF equipped with energy dissipation devices at the“dry”connections largely reduces the expected economic loss,downtime,and resilience loss by 29%,56%,and 60%,respectively,compared to the RCF.

关键词： precast concrete frame non-emulative precast system seismic resilience seismic risk functional recovery

New findings on the influence of El Nino events on tropical cyclone formation

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Science China Earth Sciences 2024年第3期67卷 892-893页

作者： Liguang wu Department of Atmospheric and Oceanic Sciences Institute of Atmospheric SciencesFudan UniversityShanghai 200438China

Tropical cyclones typically form over warm tropical and subtropical ocean surfaces, as their formation and intensification rely primarily on the energy provided by the ocean. Pioneering research by Gray (1968) revealed that the formation of tropical cyclones requires the sea surface temperature (SST) to be no less than 26.5℃. Consequently, SST is commonly recognized as a crucial parameter among the environmental factors influencing tropical cyclone formation(Gray, 1979;Emanuel and Nolan, 2004).

关键词： tropical cyclone ocean

The Functional Redundancy of Neddylation E2s and E3s in Modulating the Fitness of Regulatory T Cells

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Research 2024年第2期2023卷 373-387页

作者： Di wu Yi Sun Cancer Institute(Key Laboratory of Cancer Prevention and Intervention China National Ministry of Education)of the Second Affiliated Hospital and Institute of Translational MedicineZhejiang University School of MedicineHangzhou 310029China Cancer Center of Zhejiang University Hangzhou 310029China Zhejang Provincial Clinical Research Center for Cancer Zhejang ProvinceChina Key Laboratory of Molecular Biology in Medical Sciences Zhejang ProvinceChina Research Center for Life Science and Human Health Binjiang Institute of Zhejiang UniversityHangzhou 310053China

Neddylation is necessary for activation of Cullin-RING ligases(CRLs),which degrade various immune regulatory *** recent study showed that while depletion of neddylation E2-E3 pair Ube2f-Sag in regulatory T(T_(reg))cells had no obvious phenotype,the same depletion of either Ube2m or Rbx1 caused inflammation disorders with different *** these E2s or E3s compensate each other in functional regulations of T_(reg)cells is,however,previously *** this report,we generated Foxp3^(Cre);Ube2m^(fl/fl);Ube2f^(fl/fl)or Foxp3^(Cre);Rbx1^(fl/fl);Sag^(fl/fl)double-null mice by simultaneous deletion of both neddylation E2s or E3s in T_(reg)cells,***,Ube2m&Ube2f double-null mice developed much severe autoimmune phenotypes than did Ube2m-null mice,indicating that Ube2m markedly compensates Ube2f in T_(reg)*** minor worsened autoimmune phenotypes seen at the very early stage in Rbx1&Sag double-null than Rbx1-null mice is likely due to already severe phenotypes of the later,indicating a minor compensation of Rbx1 for *** RNA profiling-based analyses revealed that up-and down-regulations of few signaling pathways in T_(reg)cells are associated with the severity of autoimmune ***,severer inflammation phenotypes seen in mice with double E3-null than with double E2-null T_(reg)cells indicate a neddylation-independent mechanism of 2 E3s,also known to serve as the RING component of CRLs in regulation of T_(reg)cell fitness.

关键词： Foxp3 inflammation markedly

Rational surface charge engineering of haloalkane dehalogenase for boosting the enzymatic performance in organic solvent solutions

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Chinese Journal of Chemical Engineering 2024年第1期65卷 276-285页

作者： Yin wu Yan Sun Department of Biochemical Engineering School of Chemical Engineering and Technology and Key Laboratory of Systems Bioengineering and Frontiers Science Center for Synthetic Biology(Ministry of Education)Tianjin UniversityTianjin 300350China

Biocatalysis in organic solvents(OSs)has numerous important applications,but native enzymes in OSs often exhibit limited catalytic ***,we proposed a computation-aided surface charge engineering strategy to improve the catalytic performance of haloalkane dehalogenase DhaA in OSs based on the energetic analysis of substrate binding to the DhaA *** variants with enhanced OS resistance were obtained by replacing negative charged residues on the surface with positive charged residue(Arg).Particularly,a four-substitution variant E16R/E93R/E121R/E257R exhibited the best catalytic performance(five-fold improvement in OS resistance and seven-fold half-life increase in 40%(vol)dimethylsulfoxide).As a result,the overall catalytic performance of the variant could be at least 26 times higher than the wild-type *** spectroscopy and molecular dynamics simulation studies revealed that the residue substitution mainly enhanced OS resistance from four aspects:(a)improved the overall structural stability,(b)increased the hydrophobicity of the local microenvironment around the catalytic triad,(c)enriched the hydrophobic substrate around the enzyme molecule,and(d)lowered the contact frequency between OS molecules and the catalytic *** findings validate that computationaided surface charge engineering is an effective and ingenious rational strategy for tailoring enzyme performance in OSs.

关键词： Surface charge engineering Organic solvent resistance Molecular dynamics simulation Haloalkane dehalogenase

Dual-ion carrier storage through Mg^(2+) addition for high-energy and long-life zinc-ion hybrid capacitor

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 179-185页

作者： Junjie Zhang Xiang wu School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

Cation additives can efficiently enhance the total electrochemical capabilities of zinc-ion hybrid capacitors (ZHCs).However their energy storage mechanisms in zinc-based systems are still under ***,we modulate the electrolyte and achieve dual-ion storage by adding magnesium *** we assemble several Zn//activated carbon devices with different electrolyte concentrations and investigate their electrochemical reaction dynamic *** zinc-ion capacitor with Mg^(2+)mixed solution delivers 82 mAh·g^(-1)capacity at 1 A·g^(-1) and maintains 91%of the original capacitance after 10000 *** is superior to the other assembled zinc-ion devices in single-component *** finding demonstrates that the double-ion storage mechanism enables the superior rate performance and long cycle lifetime of ZHCs.

关键词： zinc-ion hybrid capacitor MgSO_(4) electrolyte rate performance storage mechanism