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The Effect of Boreal Summer Intraseasonal Oscillation on Mixed Layer and Upper Ocean Temperature over the South China Sea

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Journal of Ocean University of China 2023年第2期22卷 285-296页

作者： jia wentao SUN Jilin ZHANG Weimin WANG Huizan College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China

Intraseasonal oscillation of the mixed layer and upper ocean temperature has been found to occur over the South China Sea(SCS)in the summer monsoon season based on the multiple reanalysis and observational data in this study.The method of composite analysis and an upper ocean temperature equation assisted the analysis of physical mechanisms.The results show that the mixed layer depth(MLD)in the SCS has a significant oscillation with a 30-60 d period over the SCS region,which is closely related to boreal summer intraseasonal oscillation(BSISO)activities.The MLD can increase(decrease)during the positive(negative)phase of the BSISO and usually lags behind by approximately one-eighth of the lifecycle(5 days)of the BSISO-related convection.The BSISO may cause periodic anomalies at the air-sea boundary,such as wind stress and heat flux,so it can play a dominant role in modulating the variation in MLD.There also are significant intraseasonal seawater temperature anomalies in both the surface and subsurface layers of the SCS.In addition,during the initial phase of the BSISO,the temperature anomaly signals of the thermocline are obviously opposite to the sea surface temperature(SST),especially in the southern SCS.According to the results from the analysis of the temperature equation,the vertical entrainment term caused by BSISO-related wind stress is stronger than the thermal forcing during the initial stage of convection,and it is more significant in the southern SCS.

关键词： boreal summer intraseasonal oscillation South China Sea mixed layer depth upper ocean temperature

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钛酸钡/炭黑/PDMS三元压电复合薄膜及其在振动能量采集器上的应用研究

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传感技术学报 2024年第5期37卷 789-796页

作者：罗翠线贾文涛侯娇红张卫山西财经大学信息学院山西太原030006

制备了性能优越的三元无铅钛酸钡/炭黑/PDMS(BaTiO_(3)/C/PDMS)压电复合薄膜。周期振动击打下BaTiO_(3)/C/PDMS压电复合薄膜输出电压为7.43 V,比BaTiO_(3)/PDMS压电复合薄膜的输出电压增加了143%。当导电材料C的质量分数为3.2 wt%时,BaT... 详细信息

制备了性能优越的三元无铅钛酸钡/炭黑/PDMS(BaTiO_(3)/C/PDMS)压电复合薄膜。周期振动击打下BaTiO_(3)/C/PDMS压电复合薄膜输出电压为7.43 V,比BaTiO_(3)/PDMS压电复合薄膜的输出电压增加了143%。当导电材料C的质量分数为3.2 wt%时,BaTiO_(3)/C/PDMS复合薄膜可获得最大输出电压,且压电性能和铁电性能最优。复合薄膜产生的电能可储存至超级电容器,用于驱动对应的商用发光二极管。将BaTiO_(3)/PDMS和BaTiO_(3)/C/PDMS基复合压电材料分别应用于非对称振动能量采集器,实验结果表明系统的-3 dB带宽由未填充C时的8.7 Hz增加到填充C后的9.3 Hz。

关键词：压电传感器件钛酸钡/炭黑/PDMS 复合薄膜能量采集器

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极地高密度烧结雪层无侧限压缩离散元分析

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极地研究 2024年第2期36卷 240-253页

作者：李涛霍海峰胡彪贾汶韬陈庆炜中国民航大学交通科学与工程学院天津300300 交通部机场工程安全与长期性能科研基地天津300300

从新雪变成老雪的过程叫作“烧结”,对雪层进行人工压实和烧结是建设极地机场跑道的主要方法,雪层烧结使雪颗粒间胶结尺寸增加,雪层强度增强。为探究人工压实烧结雪层在无侧限压缩荷载下的胶结接触破坏规律和承力机理,本研究采用三维离... 详细信息

从新雪变成老雪的过程叫作“烧结”,对雪层进行人工压实和烧结是建设极地机场跑道的主要方法,雪层烧结使雪颗粒间胶结尺寸增加,雪层强度增强。为探究人工压实烧结雪层在无侧限压缩荷载下的胶结接触破坏规律和承力机理,本研究采用三维离散元方法模拟了密实烧结雪层无侧限压缩试验,在室内试验结果基础上构建雪的胶结接触模型并标定接触参数,通过建立压实烧结雪离散元模型,进行了无侧限压缩加载模拟。模拟的结果验证了离散元模拟的有效性并表明:(1)在无侧限压缩下,密实烧结雪试样在剪切带区域发生集中胶结破坏,胶结断裂主要归因于接触在受拉状态下受剪;(2)冰雪颗粒的破碎会影响冰雪道面的抗剪强度,因此需要慎重考虑高应力对内摩擦角的影响。本研究将为极地地区通过压实烧结雪层简单现场试验预测其复杂应力路径下的力学特征提供科学支持。

关键词：极地压实雪雪烧结离散元无侧限压缩试验

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MODELS: a six-step framework for developing an infectious disease model

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贫困所致传染病(英文) 2024年第2期13卷 1-11页

作者： Rui jia Li Kangguo Wei Hongjie Guo Xiaohao Zhao Zeyu Wang Yao Song wentao Abudunaibi Buasiyamu Chen Tianmu State Key Laboratory of Vaccines for Infectious Diseases Xiang An Biomedicine Laboratory School of Public Health Xiamen University Xiamen city China State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics National Innovation Platform for Industry-Education Integration in Vaccine Research Xiamen University Xiamen City China

Since the COVID-19 pandemic began, a plethora of modeling studies relatedto COVID-19 have been released. While some models stand out due to their innovative approaches, others are flawed in their methodology. To assist novices, frontline healthcare workers, and public health policymakers in navigating the complex landscape of these models, we introduced a structured framework named MODELS. This framework is designed to detail the essential steps and considerations for creating a dependable epidemic model, offering direction to researchers engaged in epidemic modeling endeavors.

关键词： Epidemic models Model construction MODELS framework

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Role of primary Zr-rich particles on microstructure and magnetic properties of 2:17-type Sm-Co-Fe-Cu-Zr permanent magnets

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Journal of Materials Science & Technology 2020年第18期52卷 73-81页

作者： Tao Yuan Xin Song Xianglong Zhou wentao jia Munzali Musa Jingdong Wang Tianyu Ma Frontier Institute of Science and Technology State Key Laboratory for Mechanical Behavior of Materialsand MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterXi'an Jiaotong UniversityXi'an710049China The Southwest Applied Magnetism Research Institute Mianyang621000China

Trace Zr addition is essential for achieving desired cellular nanostructure and large coercivity in the pinning-controlled 2:17-type Sm-Co-Fe-Cu-Zr magnets that have served as the strongest high temperature permanent magnets for over 40 years.However,accompanying this is the formation of Zr-rich particles that may deteriorate the hard magnetic properties.Besides the formerly-reported 1:3R Zr-rich platelets,in this work,1–2μm sized Zr6(Co,Fe)23(6:23)particles(Fm 3 m)and 100–200 nm sized 1:3R Zr-rich particles were also found based on combined structural identifications and element mapping analysis.Around such particles,the desired 1:5H cell wall precipitates that provide the strongest pinning force of magnetic domain wall motions are rare,forming the precipitate-free-zones(PFZs).The 1:5H-PFZs and the soft magnetism of both 6:23 and 1:3R Zr-rich particles act as local weak pinning points,which are unfavorable to retain the large magnetization in strong opposite fields and lead to poor squareness.As observed in a Sm25Co45.9Fe19.5Cu5.6Zr4.0(wt.%)magnet,the co-existence of such Zr-rich particles and the associated 1:5H-PFZs leads to a pretty low squareness factor of only 52.89%given the large coercivity of 29.04 kOe.Our findings suggest that careful controlling the Zr content and avoiding its aggregation to form harmful 6:23 and 1:3R Zr-rich particles are essential for achieving high squareness as well as large energy product in the Sm-Co-Fe-Cu-Zr permanent magnets.

关键词： Permanent magnets Sm-Co alloys Microstructure Precipitates

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Revisiting the pinning sites in 2:17-type Sm-Co-Fe-Cu-Zr permanent magnets

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Journal of Rare Earths 2021年第12期39卷 1560-1566,I0004页

作者： Xianglong Zhou Yao Liu wentao jia Xin Song Andong Xiao Tao Yuan Fang Wang Jiuping Fan Tianyu Ma State Key Laboratory for Mechanical Behavior of Materials and MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterFrontier Institute of Science and TechnologyXi'an Jiaotong University The Southwest Applied Magnetism Research Institute Key Laboratory of Magnetic Molecules and Magnetic Information Materials of the Ministry of Education

It is still an open debate whether the 1:5 H cell boundaries(CBs)or the intersections of 1:3 R platelets and1:5 H CBs are the strong pining sites for the cellular nanostructured 2:17-type Sm-Co-Fe-Cu-Zr high temperature permanent magnets despite that they have been widely applied in advanced industries since 1970 s.Herein,through tuning the volume fraction of Zr-enriched 1:3 R platelets by varying the second-step aging time,the pinning behavior in a model magnet Sm_(2.5)Co_(44.9)Fe_(21.5)Cu_(5.6)Zr_(3.0)(wt%)was investigated.The results show that the volume fraction of 1:3 R platelets can be effectively enlarged without changing the cell size(i.***.the volume fraction of CBs)by extending the aging time at 400℃.Micro scopic TEM characterizations co mbined with macro scopic magnetic measurements reveals that the locally thickened 1:3 R platelets after long-term second-step aging reduce the effective pinning area by interrupting the magnetic domain walls at CBs,weakening the average pinning strength and the coercivity of the magnet.Consequently,our work supports that the 1:5 H CBs act as the dominating pinning sites instead of the intersections of 1:3 R platelets and 1:5 H CBs,which may provide an important insight towards understanding the hard magnetism of pinning-controlled permanent magnets.

关键词： Rare earths Sm-Co magnet Magnetic properties Magnetic domain wall

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Two-dimensional ballistic transistors for advanced-node integrated circuits

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National Science Review 2024年第3期11卷 9-10页

作者： jia Li Xidong Duan Hunan Provincial Key Laboratory of Two-Dimensional Materials State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University

As the feature size of metal-oxide-semiconductor-field-effect-transistors(MOSFETs) in integrated circuits(ICs)is reduced to sub-10-nm, the traditional channel materials are plagued by enhanced scattering and short-cha... 详细信息

关键词： CONTACT

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Facile synthesis of transition metal complexes with five coplanar metal-carbon σ-bonds

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National Science Review 2024年第4期11卷 11-12页

作者： Guocheng jia Department of Chemistry Hong Kong University of Science and Technology

Carbon is one of the most important elements in chemistry, forming a vast number of organic compounds. It can also form a variety of organometallic compounds with a metal–carbon bond. Metal alkyl, carbene and carbyne complexes are classical examples of organometallic compounds. A particularly interesting class of organometallic compounds are all-carbon metallacycles formed by combination of a metal and a hydrocarbon chain serving as a chelating agent with only carbon atoms as the donor atoms. Many interesting monocyclic metallacycles made of a chelating bidentate hydrocarbon chain are known, for example, metallacyclobutadienes, metallacyclopentadienes and metallabenzenes[1].

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Perenniality:From model plants to applications in agriculture

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Molecular Plant 2024年第1期17卷 141-157页

作者： Bo Zhao jia-Wei Wang National Key Laboratory of Plant Molecular Genetics CAS Center for Excellence in Molecular Plant Sciences(CEMPS)Institute of Plant Physiology and Ecology(SIPPE)Chinese Academy of Sciences(CAS)Shanghai 200032China School of Life Science and Technology ShanghaiTech UniversityShanghai 201210China Key Laboratory of Plant Carbon Capture CASShanghai 200032China New Cornerstone Science Laboratory Shanghai 200032China

To compensate for their sessile nature,plants have evolved sophisticated mechanisms enabling them to adapt to ever-changing environments.One such prominent feature is the evolution of diverse life history strategies,particularly such that annuals reproduce once followed by seasonal death,while perennials live longer by cycling growth seasonally.This intrinsic phenology is primarily genetic and can be altered by environmental factors.Although evolutionary transitions between annual and perennial life history strategies are common,perennials account for most species in nature because they survive well under year-round stresses.This proportion,however,is reversed in agriculture.Hence,perennial crops promise to likewise protect and enhance the resilience of agricultural ecosystems in response to climate change.Despite significant endeavors that have been made to generate perennial crops,progress is slow because of barriers in studying perennials,and many developed species await further improvement.Recent findings in model species have illustrated that simply rewiring existing genetic networks can lead to lifestyle variation.This implies that engineering plant life history strategy can be achieved by manipulating only a few key genes.In this review,we summarize our current understanding of genetic basis of perenniality and discuss major questions and challenges that remain to be addressed.

关键词： perenniality developmental plasticity flowering time poplar Arabis alpina perennial crops life history strategy

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A prognostic four-gene signature and a therapeutic strategy for hepatocellular carcinoma:Construction and analysis of a circRNA-mediated competing endogenous RNA network

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Hepatobiliary & Pancreatic Diseases International 2024年第3期23卷 272-287页

作者： Hai-Yan Zhang jia-Jie Zhu Zong-Ming Liu Yu-Xuan Zhang jia-jia Chen Ke-Da Chen Zhejiang Chinese Medical University Hangzhou 310053China Shulan International Medical College Zhejiang Shuren UniversityHangzhou 310015China State Key Laboratory for Diagnosis and Treatment of Infectious Diseases National Clinical Research Center for Infectious DiseasesNational Medical Center for Infectious DiseasesCollaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesThe First Affiliated HospitalZhejiang University School of MedicineHangzhou 310009China

Background:Hepatocellular carcinoma(HCC)has a poor long-term prognosis.The competition of circular RNAs(circRNAs)with endogenous RNA is a novel tool for predicting HCC prognosis.Based on the alterations of circRNA regulatory networks,the analysis of gene modules related to HCC is feasible.Methods:Multiple expression datasets and RNA element targeting prediction tools were used to construct a circRNA-microRNA-mRNA network in HCC.Gene function,pathway,and protein interaction analyses were performed for the differentially expressed genes(DEGs)in this regulatory network.In the proteinprotein interaction network,hub genes were identified and subjected to regression analysis,producing an optimized four-gene signature for prognostic risk stratification in HCC patients.Anti-HCC drugs were excavated by assessing the DEGs between the low-and high-risk groups.A circRNA-microRNA-hub gene subnetwork was constructed,in which three hallmark genes,KIF4A,CCNA2,and PBK,were subjected to functional enrichment analysis.Results:A four-gene signature(KIF4A,CCNA2,PBK,and ZWINT)that effectively estimated the overall survival and aided in prognostic risk assessment in the The Cancer Genome Atlas(TCGA)cohort and International Cancer Genome Consortium(ICGC)cohort was developed.CDK inhibitors,PI3K inhibitors,HDAC inhibitors,and EGFR inhibitors were predicted as four potential mechanisms of drug action(MOA)in high-risk HCC patients.Subsequent analysis has revealed that PBK,CCNA2,and KIF4A play a crucial role in regulating the tumor microenvironment by promoting immune cell invasion,regulating microsatellite instability(MSI),and exerting an impact on HCC progression.Conclusions:The present study highlights the role of the circRNA-related regulatory network,identifies a four-gene prognostic signature and biomarkers,and further identifies novel therapy for HCC.

关键词： Hepatocellular carcinoma circRNA-related ceRNA network Biomarker Least absolute shrinkage and selection operator Bioinformatics

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