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Subaqueous volcanism in the Paleo-Pacific Ocean based on Jurassic basaltic tuff and pillow basalt in the Raohe Complex,NE china

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Science china Earth sciences 2018年第8期61卷 1042-1056页

作者： SUN MingDao xu yigang CHEN HanLin State Key Laboratory of Isotope geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Earth Science College Zhejiang University Hangzhou 310027 China

On-land records of subaqueous explosive volcanic eruptions are rarely *** understand this phenomenon and discuss its global significance,we studied the geochronology and geochemistry of basaltic tuff and pillow basalt in the Raohe Complex,NE *** basaltic tuff consists of well-sorted vitreous,crystal(mostly clinopyroxene),and minor lithic *** is characterized by a high Mg O(15.7–15.9%)content and zero Eu anomalies(Eu/Eu~*=99–102).The tuff erupted at 172±1 Ma based on SHRIMP zircon U-Pb dating,coeval with the previously reported age of the pillow *** pillow basalt has intermediate Mg O content and weakly negative Eu anomalies(Eu/Eu~*=90–99).Based on immobile trace element discrimination,the basaltic tuff and pillow basalt belong to alkali basalt displaying an OIB-type trace element pattern,and consistent Nd isotope signatures ofε_(Nd)(t)=4.4–6.2,indicating an identical mantle *** pillow basalt has coupled Sr-Nd isotopic values,whereas the basaltic tuff has significantly higher initial^(87)Sr/^(86)Sr values that are similar to synchronous *** indicates that the elemental exchange between the mantle-derived material and seawater most likely occurred in a subaqueous explosive volcanic eruption,rather than in an effusive *** calculations suggest that the high efficiency of the Sr-isotope exchange between seawater and the mantle-derived material triggered by a subaqueous explosive volcanic eruption is likely one of the main reasons for the rapid decrease of the global seawater^(87)Sr/^(86)Sr value.

关键词： Raohe Complex Subaqueous volcanism Jurassic Paleo-Pacific Ocean Seawater Sr isotope

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Translational Regulation of Sperm Specific AKAP3 by RNA Binding Proteins and PKA Signaling During Mouse Spermiogenesis

Translational Regulation of Sperm Specific AKAP3 by RNA Bind...

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2012全国发育生物学大会

作者： Kaibiao xu,Lele Yang,Danyun Zhao,Yaoyao Wu,Huayu Qi Key Laboratory of Regenerative Biology,South china institute for Stem Cell Biology and Regenerative Medicine, guangzhou institutes of Biomedicine and Health,chinese academy of sciences,guangzhou,510530

The development of mammalian spermatozoa relies on coordinated regulation of gene expression,protein synthesis and translocation of sperm components into right places at right time during *** mechanisms that regulate spermiogenesis,the last stage of spermatogenesis,are largely ***3 is a sperm-specific protein that binds PKA regulatory subunit and has been suggested to regulate capacitation and motility of mature sperm. Through analyses of akap3 expression,we found that the synthesis of AKAP3 is regulated at post-transcriptional and translational ***3 mRNA is expressed early during spermatogenesis while its protein synthesis occurs at late spermiogenic *** biochemical and cell biological studies demonstrated that AKAP3 and PKA subunits form protein complexes with multiple RNA binding proteins(RBPs),including PABPCl,MIWI and DBHS protein *** PABPC1 and NONO are found to bind mRNAs of sperm-specific genes,including akap3,and are the components of chromatoid body,the RNA processing center in male germ *** addition,PABPC1 and MIWI,two RBPs that have been shown to participate in protein translation during spermatogenesis co-localize with nascent AKAP3 in the cytoplasm of elongating *** biochemical analyses revealed that PKA subunits are associated with polysomal fractions on sucrose gradient and AKAP3 protein synthesis is positively regulated by PKA signaling. Conclusions:Taken together,these results indicate that the stage-specific protein synthesis in developing spermatogenic cells is regulated by RNA binding proteins and PKA signaling,underscoring the molecular mechanisms that regulate protein translation during mouse spermiogenesis.

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Domains and enrichment mechanism of the lithospheric mantle in western Yunnan: A comparative study on two types of Cenozoic ultrapotassic rocks

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Science china Earth sciences 2005年第3期48卷 326-337页

作者： XIA Ping xu yigang guangzhou institute of geochemistry Chinese Academy of Sciences Guangzhou 510640 China Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China

Geochemical comparison of two suites of Cenozoic potassic volcanic rocks in western Yunnan reveals the existence of two mantle domains beneath this region, which corre- spond to their respective tectonic affinity. The Erhai ultrapotassic rocks (42—24Ma) in western Yangtze Craton are characterized by LILE enrichment, HFSE depletion, low TiO2 content ( china Block show an OIB-type trace elemental signature, high TiO2 content (>2%), low initial 87 Sr/86Sr (0.7041—0.7060) and positive εNd (5.46—7.03). These features resemble the typical intraplate potassic rocks around the world. These rocks are thus interpreted as melting products of a fertile garnet lherzolitic source which has been infiltrated by small-volume, asthenosphere-derived silicate melts. The temporal and spatial distribution of these two types of K-rich rocks cannot be explained by any unified tectonic model. It is proposed that the Oligocene magmatism in the Erhai area may have resulted from convective thinning of the thickened lithosphere, whereas the post-Miocene volcanism in the Maguan area was related to the opening of South china Sea.

关键词： ultrapotassic magma, geochemistry, magmatic evolution, lithospheric mantle, western Yunnan.

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A Quarterly High RFM Mining Algorithm for Big Data Management

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Computers, Materials & Continua 2024年第9期80卷 4341-4360页

作者： Cuiwei Peng Jiahui Chen Shicheng Wan Guotao xu School of International Education Guangdong University of TechnologyGuangzhou510006China School of Computer Science and Technology Guangdong University of TechnologyGuangzhou510006China Business Administration South China University of TechnologyGuangzhou510641China guangzhou institute of Technology Xidian UniversityGuangzhou710071China

In today’s highly competitive retail industry,offline stores face increasing pressure on *** hope to improve their ability in shelf management with the help of big data *** this,on-shelf availability is an essential indicator of shelf data management and closely relates to customer purchase ***(recency,frequency,andmonetary)patternmining is a powerful tool to evaluate the value of customer ***,the existing RFM patternmining algorithms do not consider the quarterly nature of goods,resulting in unreasonable shelf availability and difficulty in *** solve this problem,we propose a quarterly RFM mining algorithmfor On-shelf products named *** algorithmmines the high recency,high frequency,and high monetary patterns and considers the period of the on-shelf goods in quarterly *** conducted experiments using two real datasets for numerical and graphical analysis to prove the algorithm’s *** with the state-of-the-art RFM mining algorithm,our algorithm can identify more patterns and performs well in terms of precision,recall,and F1-score,with the recall rate nearing 100%.Also,the novel algorithm operates with significantly shorter running times and more stable memory usage than existing mining ***,we analyze the sales trends of products in different quarters and seasonal *** analysis assists businesses in maintaining reasonable on-shelf availability and achieving greater profitability.

关键词： Data mining recency pattern high-utility itemset RFM pattern mining on-shelf management

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A Framework Based on the DAO and NFT in Blockchain for Electronic Document Sharing

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Computer Modeling in Engineering & sciences 2024年第9期140卷 2373-2395页

作者： Lin Chen Jiaming Zhu Yuting xu Huanqin Zheng Shen Su Cyberspace institute of Advanced Technology Guangzhou UniversityGuangzhou510006China Engineering Research Center of lntegration and Application of Digital Learning Technology Ministry of EducationBeijing100816China

In the information age,electronic documents(e-documents)have become a popular alternative to paper documents due to their lower costs,higher dissemination rates,and ease of knowledge ***,digital copyright infringements occur frequently due to the ease of copying,which not only infringes on the rights of creators but also weakens their creative ***,it is crucial to establish an e-document sharing system that enforces copyright ***,the existing centralized system has outstanding vulnerabilities,and the plagiarism detection algorithm used cannot fully detect the context,semantics,style,and other factors of the *** watermark technology is only used as a means of infringement *** paper proposes a decentralized framework for e-document sharing based on decentralized autonomous organization(DAO)and non-fungible token(NFT)in *** use of blockchain as a distributed credit base resolves the vulnerabilities inherent in traditional centralized *** e-document evaluation and plagiarism detection mechanisms based on the DAO model effectively address challenges in comprehensive text information checks,thereby promoting the enhancement of e-document *** mechanism for protecting and circulating e-document copyrights using NFT technology ensures effective safeguarding of users’e-document copyrights and facilitates e-document ***,recognizing the security issues within the DAO governance mechanism,we introduce an innovative optimization *** experimentation,we validate the enhanced security of the optimized governance mechanism,reducing manipulation risks by up to 51%.Additionally,by utilizing evolutionary game analysis to deduce the equilibrium strategies of the framework,we discovered that adjusting the reward and penalty parameters of the incentive mechanism motivates creators to generate superior quality and unique e-documents,while evaluators are more likely to engage in

关键词： Electronic document sharing blockchain DAO NFT evolutionary game

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Towards growth of pure AB-stacked bilayer graphene single crystals

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Nano Research 2024年第5期17卷 4616-4621页

作者： Xiaowen Zhang Tao Zhou Yunlong Ren Zuo Feng Ruixi Qiao Qinghe Wang Bin Wang Jinxia Bai Muhong Wu Zhilie Tang xu Zhou Kaihui Liu Xiaozhi xu Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum MaterialsSchool of PhysicsSouth China Normal UniversityGuangzhou 510006China Guangdong-Hong Kong Joint Laboratory of Quantum Matter School of PhysicsSouth China Normal UniversityGuangzhou 510006China Physical Science and Engineering Division King Abdullah University of Science and TechnologyThuwal 23955–6900Saudi Arabia State Key Laboratory for Mesoscopic Physics Frontiers Science Center for Nano-optoelectronicsSchool of PhysicsPeking UniversityBeijing 100871China institute for Frontier Science Nanjing University of Aeronautics and AstronauticsNanjing 210094China International Centre for Quantum Materials Collaborative Innovation Centre of Quantum MatterPeking UniversityBeijing 100871China Songshan Lake Materials Laboratory Institute of PhysicsChinese Academy of SciencesDongguan 523808China

Given its intriguing band structure and unique tunable bandgap,AB-stacked bilayer graphene has great potentials in the applications of high-end electronics,optoelectronics and *** epitaxial growth of AB-stacked single-crystal bilayer graphene films requires a strict AB-stacked lattice,identical orientations and seamless stitching of bilayer graphene ***,the particles inevitably present on the metal surface that produced during high temperature growth would induce random orientations,twisted stacking islands,and uncontrollable multilayers,which is a great challenge to ***,we propose a heat-resisting-box assisted strategy to produce nearly pure AB-stacked bilayer graphene single-crystal films on Cu/Ni(111)*** our technique,the particles on the Cu/Ni(111)surface are effectively eliminated,which greatly minimizes the occurrence of randomly twisted islands and uncontrollable *** as-grown AB-stacked bilayer graphene films show>99%alignment and>99%AB stacking *** work provides a promising method towards the growth of pure AB-stacked bilayer graphene single crystals and would accelerate its device applications.

关键词： bilayer graphene AB stacking uniform growth heat-resisting box

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OSCILLATING CRITERIA FOR CERTAIN EVEN ORDER NEUTRAL DIFFERENTIAL EQUATIONS WITH DEVIATING ARGUMENTS

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Annals of Differential Equations 2007年第1期23卷 26-34页

作者： Huang Xianyong xu Zhiting Dept. of Math. Guangdong Institute of Education Guangzhou 510303 School of Mathematical sciences South China Normal University Guangzhou 510631

By using the integral averaging technique, oscillating criteria for certain even order neutral differential equation with deviating arguments are established. These results extend some known oscillation criteria due t... 详细信息

关键词： oscillatory even order neutral differential equation integral averaging technique

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生物质气化重整合成二甲醚

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燃料化学学报 2004年第3期32卷 297-300页

作者：王铁军常杰祝京旭付严中国科学技术大学安徽合肥230026 中国科学院广州能源研究所广东广州510070 加拿大西安大略大学

以松木粉为原料,采用空气水蒸气气化制备了富氢气化气,通过添加甲烷重整富氢气化气,调整了合成气化学当量比,在260℃、4MPa、12000h-1条件下,对生物质合成气一步法合成二甲醚进行了实验研究。结果表明:引入甲烷重整,活化了富氢气化气... 详细信息

以松木粉为原料,采用空气水蒸气气化制备了富氢气化气,通过添加甲烷重整富氢气化气,调整了合成气化学当量比,在260℃、4MPa、12000h-1条件下,对生物质合成气一步法合成二甲醚进行了实验研究。结果表明:引入甲烷重整,活化了富氢气化气中过量的CO2,甲烷的最佳加入量为CH4 CO2=1,生物质碳转化率达到70%以上,尾气中二甲醚选择性达到69.6%。

关键词：生物质合成二甲醚

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Machine learning-based performance predictions for steels considering manufacturing process parameters:a review

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Journal of Iron and Steel Research International 2024年第7期31卷 1555-1581页

作者： Wei Fang Jia-xin Huang Tie-xu Peng Yang Long Fu-xing Yin Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science and EngineeringHebei University of TechnologyTianjin 300132China institute of New Materials Guangdong Academy of ScienceGuangzhou 510651GuangdongChina

Steels are widely used as structural materials,making them essential for supporting our lives and ***,further improving the comprehensive properties of steel through traditional trial-and-error methods becomes challenging due to the continuous development and numerous processing parameters involved in steel *** address this challenge,the application of machine learning methods becomes crucial in establishing complex relationships between manufacturing processes and steel *** review begins with a general overview of machine learning methods and subsequently introduces various performance predictions in steel *** classification of performance pre-diction was used to assess the current application of machine learning model-assisted *** important issues,such as data source and characteristics,intermediate features,algorithm optimization,key feature analysis,and the role of environmental factors,were summarized and *** insights will be beneficial and enlightening to future research endeavors in this field.

关键词： Steel Manufacturing process Machine learning Performance prediction Algorithm

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Saikosaponin D improves nonalcoholic fatty liver disease via gut microbiota-bile acid metabolism pathway

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Food Science and Human Wellness 2024年第5期13卷 2703-2717页

作者： Lan Li Shengye Yang Xinyu Liang Yameng Liu Hualing xu Xiaozhen Guo Cen Xie Xiaojun xu State Key Laboratory of Natural Medicines China Pharmaceutical UniversityNanjing 210029China Guangdong Provincial People's Hospital Guangdong Academy of Medical SciencesGuangzhou 510080China School of chinese Materia Medica Nanjing University of Chinese MedicineNanjing 210029China State Key Laboratory of Drug Research Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China

Non-alcoholic fatty liver disease(NAFLD)is the main cause of chronic liver disease *** is widely used in the treatment of non-alcoholic fatty liver,and saikosaponin D(SSD)is one of the main active components of *** purpose of this study was to investigate the efficacy of SSD in the treatment of NAFLD and to explore the mechanism of SSD in the improvement of NAFLD based on“gut-liver axis”.Our results showed that SSD dose-dependently alleviated high fat diet-induced weight gain in mice,improved insulin sensitivity,and also reduced liver lipid accumulation and injury-related biomarkers aspartate aminotransferase(AST)and alanine aminotransferase(ALT).Further exploration found that SSD inhibited the mRNA expression levels of farnesoid X receptor(Fxr),small heterodimer partner(Shp),recombinant fibroblast growth factor 15(Fgf15)and apical sodium dependent bile acid transporter(Asbt)in the intestine,suggesting that SSD improved liver lipid metabolism by inhibiting intestinal FXR *** can significantly reduce the gut microbiota associated with bile salt hydrolase(BSH)expression,such as *** BSH expression reduced the ratio of unconjugated to conjugated bile acids,thereby inhibiting the intestinal *** data demonstrated that SSD ameliorated NAFLD potentially through the gut microbiota-bile acidintestinal FXR pathway and suggested that SSD is a promising therapeutic agent for the treatment of NAFLD.

关键词： Saikosaponin D(SSD) Non-alcoholic fatty liver disease Bile acids Gut microbiota Farnesoid X receptor

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