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建立大鼠代谢综合征模型及其胎盘和成年个体中糖脂代谢性别差异研究

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生殖医学杂志 2024年第6期33卷 763-774页

作者：姚灿灿刁天吕志远徐祥波陈西华贺斌国家卫生健康委科学技术研究所国家卫生健康委员会生殖健康工程技术研究中心北京100081 北京协和医学院研究生院北京100730 北京大学前沿交叉学科研究院北京100871

目的构建代谢综合征实验动物模型并探究糖脂代谢异常在胎盘和成年个体的雌雄差异。方法采用高热量饮食+5%果糖饮水诱导大鼠妊娠期代谢综合征(GMS)模型。雌性大鼠GMS模型及妊娠:16只雌性Wistar大鼠随机分为对照组(正常饮食饮水+妊娠;NC组... 详细信息

目的构建代谢综合征实验动物模型并探究糖脂代谢异常在胎盘和成年个体的雌雄差异。方法采用高热量饮食+5%果糖饮水诱导大鼠妊娠期代谢综合征(GMS)模型。雌性大鼠GMS模型及妊娠:16只雌性Wistar大鼠随机分为对照组(正常饮食饮水+妊娠;NC组,n=8)和GMS模型组(高热量饮食+5%果糖饮水+妊娠;HDF5组,n=8)。雄性及雌性大鼠代谢综合征(MS)模型:雌、雄性大鼠各14只分别随机分为2组,即雌性大鼠MS组(F-HDF5组,n=7)、雄性大鼠MS组(M-HDF5组,n=7),雌、雄性大鼠对照组(F-NC组,n=7;M-NC组,n=7)。分别在适应1周后的基线时(W0)到饮食/饮水干预第5周(W5)内每周监测记录各组大鼠的体重、收缩压(SBP)和舒张压(DBP),于W0和W5检测其空腹血糖(FBG)值并进行口服葡萄糖糖耐量试验(OGTT),并采集空腹血清检测甘油三酯(TGs)和总胆固醇(T-CHO)浓度。在W5时收集各组大鼠的空腹血清和肝脏组织,于妊娠第20.5天(GD20.5)收集胎鼠及胎盘组织,检测胎盘组织TGs和T-CHO浓度、脂蛋白脂肪酶(LPL)活性和游离脂肪酸(FFA)含量以及胎盘组织HE和油红O染色。结果(1)在经饮食/饮水干预5周后,相较于NC组,HDF5组的体重(P0.05),而其余各项与MS相关的指标在F-HDF5组和M-HDF5组均显著升高(P<0.05),F-HDF5组以血糖升高更为显著(P<0.05),而M-HDF5组以血脂升高更为显著(P<0.001);两组大鼠肝脏重量和FFA含量升高均以雄性表现更为显著(P<0.05),LPL的酶活性在F-HDF5组肝脏中显著降低(P<0.05)而在M-HDF5组中显著升高(P<0.05)。结论高热量饮食和5%果糖饮水可以在5周内诱导雌雄大鼠出现MS表型,糖脂代谢紊乱表现在胎盘和成年个体均具有与性别相关联的差异,也存在器官特异性。

关键词：妊娠期代谢综合征糖脂代谢异常性别差异建模方法

Gluing Affine Vortices

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Acta Mathematica Sinica,English Series 2024年第1期40卷 250-312页

作者： Guang bo xu Department of Mathematics Rutgers UniversityHill Center-Busch Campus 110 Frelinghuysen RoadPiscatawayNJ 08854-8019USA

We provide an analytical construction of the gluing map for stable affine vortices over the upper half plane with the Lagrangian boundary *** result is a necessary ingredient in studies of the relation between gauged ... 详细信息

关键词： Affine vortices gauged linear sigma model adiabatic limit symplectic reduction

自噬相关基因在小鼠月经样模型子宫内膜崩解过程中的动态表达

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生殖医学杂志 2024年第4期33卷 487-493页

作者：吴江旭阿艳妮龙泽怡张昕王思雨陈西华王树芳徐祥波北京协和医学院研究生院北京100730 国家卫生健康委科学技术研究所北京100081 青岛市妇女儿童医院妇科青岛266000 新乡医学院新乡453003

目的探究小鼠子宫内膜崩解过程中自噬相关基因表达的动态变化。方法建立小鼠月经样模型,孕酮撤退后0 h、8 h、16 h和24 h分别处死小鼠取其双侧子宫组织,通过苏木素伊红(HE)染色观察小鼠子宫组织的形态特征变化,采用蛋白质印迹(WB)检测... 详细信息

目的探究小鼠子宫内膜崩解过程中自噬相关基因表达的动态变化。方法建立小鼠月经样模型,孕酮撤退后0 h、8 h、16 h和24 h分别处死小鼠取其双侧子宫组织,通过苏木素伊红(HE)染色观察小鼠子宫组织的形态特征变化,采用蛋白质印迹(WB)检测小鼠子宫内膜崩解过程中LC3B和p62蛋白的表达动态变化,实时定量PCR(RT-qPCR)检测小鼠子宫内膜崩解过程中Lc3b、p62、Beclin1、Atg3、Atg5和Atg7的mRNA水平变化。结果孕酮撤退后0 h、8 h、16 h和24 h子宫大体颜色逐渐由浅粉色变为深红色,子宫内膜崩解坏死区域逐渐扩大,24 h时蜕膜化的子宫内膜完全崩解坏死。WB结果显示:孕酮撤退后16 h时,p62的蛋白表达水平较0 h和8 h时显著升高(P0.05),8 h到24 h其表达量显著降低(P0.05)。RT-qPCR结果显示:p62 mRNA水平在孕酮撤退后0 h到16 h无显著变化(P>0.05),而24 h时p62 mRNA水平较8 h和16 h显著降低(P0.05),而24 h时的mRNA水平显著低于其他时间点(P<0.05)。结论孕酮撤退后,子宫内膜崩解过程中自噬水平下降,提示自噬参与负调控子宫内膜崩解过程。

关键词：月经样模型子宫内膜崩解自噬 LC3B p62

Achieving Ultra-Broad Microwave Absorption Bandwidth Around Millimeter-Wave Atmospheric Window Through an Intentional Manipulation on Multi-Magnetic Resonance Behavior

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Nano-Micro Letters 2024年第9期16卷 291-307页

作者： Chuyang Liu Lu xu xueyu xiang Yujing Zhang Li Zhou bo Ouyang Fan Wu Dong‑Hyun Kim Guangbin Ji School of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016JiangsuPeople’s Republic of China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094JiangsuPeople’s Republic of China School of Physics Nanjing University of Science and TechnologyNanjing 210094JiangsuPeople’s Republic of China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094JiangsuPeople’s Republic of China School of Physics Chungbuk National UniversityCheongju 28644South Korea Department of Chemistry School of ScienceTianjin UniversityTianjin 300072People’s Republic of China

The utilization of electromagnetic waves is rapidly advancing into the millimeter-wave frequency range,posing increasingly severe challenges in terms of electromagnetic pollution prevention and radar ***,existing millimeter-wave absorbers are still inadequate in addressing these issues due to their monotonous magnetic resonance *** this work,rare-earth La^(3+)and non-magnetic Zr^(4+)ions are simultaneously incorporated into M-type barium ferrite(BaM)to intentionally manipulate the multi-magnetic resonance *** leveraging the contrary impact of La^(3+)and Zr^(4+)ions on magnetocrystalline anisotropy field,the restrictive relationship between intensity and frequency of the multi-magnetic resonance is successfully *** magnetic resonance peak-differentiating and imitating results confirm that significant multi-magnetic resonance phenomenon emerges around 35 GHz due to the reinforced exchange coupling effect between Fe^(3+)and Fe^(2+)***,Mosbauer spectra analysis,first-principle calculations,and least square fitting collectively identify that additional La^(3+)doping leads to a profound rearrangement of Zr^(4+)occupation and thus makes the portion of polarization/conduction loss increase *** a consequence,the La^(3+)-Zr^(4+)co-doped BaM achieves an ultra-broad bandwidth of 12.5+GHz covering from 27.5 to 40+GHz,which holds remarkable potential for millimeter-wave absorbers around the atmospheric window of 35 GHz.

关键词： Microwave absorption Ultra-broad bandwidth M-type barium ferrite Magnetocrystalline anisotropy field Multimagnetic resonance

Mean field game of optimal relative investment with jump risk

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Science China Mathematics 2024年第5期67卷 1159-1188页

作者： Lijun bo Shihua Wang xiang Yu School of Mathematics and Statistics Xidian UniversityXi'an 710126China School of Mathematical Sciences University of Science and Technology of ChinaHefei 230026China Department of Applied Mathematics The Hong Kong Polytechnic UniversityHong KongChina

In this paper,we study the n-player game and the mean field game under the constant relative risk aversion relative performance on terminal wealth,in which the interaction occurs by peer *** the model with n agents,the price dynamics of underlying risky assets depend on a common noise and contagious jump risk modeled by a multi-dimensional nonlinear Hawkes *** a continuum of agents,we formulate the mean field game problem and characterize a deterministic mean field equilibrium in an analytical form under some conditions,allowing us to investigate some impacts of model parameters in the limiting model and discuss some financial ***,based on the mean field equilibrium,we construct an approximate Nash equilibrium for the n-player game when n is sufficiently *** explicit order of the approximation error is also derived.

关键词： relative performance contagious jump risk mean field game with jumps mean field equilibrium approximate Nash equilibrium

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Mechanical Behavior and Failure Mechanism of an As-Extruded Mg-11wt%Y Alloy at Elevated Temperature

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Acta Metallurgica Sinica(English Letters) 2024年第6期37卷 969-981页

作者： Lan Zhang Dao-Kui xu Bao-Jie Wang Cui-Lan Lu Shuo Wang xiang-bo xu Dong-Liang Wang Xin Lv En-Hou Han School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang110159China Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819China Institute of Corrosion Science and Technology Guangdong510070China

Through carrying out the high-temperature tensile experiments on an as-extruded Mg-11wt%Y alloy at 350℃,400℃,450℃,500℃and 550℃,the mechanical behavior and fracture mechanisms at elevated temperatures are investigated and *** results show that with the increase of temperature,the yield strength and ultimate tensile strength of the alloy increase at first and then decrease,while that the elongation ratio decreases firstly and then *** the sample being tested at 350℃,the values of yield strength,ultimate tensile strength and the elongation ratio are 188 MPa,266 MPa and 11%,*** 400℃,the yield strength and ultimate tensile strength reach the maximum values of,respectively,198 MPa and 277 MPa,but the elongation ratio is the lowest and its value is only 8%.When the applied temperature is increased to 550℃,the values of yield strength and ultimate tensile strength,respectively,decrease to 140 MPa and 192 MPa and the elongation ratio increases to 38%.Failure analysis demonstrates that the fracture surfaces of different samples are mainly composed of plastic dimples and exhibit the typical characteristic of ductile *** observation to the fracture side surfaces indicates that at the temperatures of 350℃and 400℃,microcracks mainly initiate in the interior of Mg_(24)Y_(5)*** the temperatures are 450℃,500℃and 550℃,the cracks preferentially initiate at the Mg_(24)Y_(5)/α-Mg interfaces.

关键词： Mg-Y alloy High-temperature tensile properties Fracture mechanism Failure analysis

Toward tunable shape memory effect of NiTi alloy by grain size engineering:A phase field study

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Journal of Materials Science & Technology 2024年第1期168卷 276-289页

作者： bo xu Chong Wang Qingyuan Wang Failure Mechanics and Engineering Disaster Prevention Key Laboratory of Sichuan ProvinceSichuan UniversityChengdu 610065China Department of Mechanical Science and Engineering College of Architecture and EnvironmentSichuan UniversityChengdu 610065China Key Laboratory of Deep Underground Science and Engineering (Sichuan University)Ministry of EducationChengdu 610065China

The inelastic deformations of shape memory alloys(SMAs)always show poor controllability due to the avalanche-like martensite transformation,and the effective control for the deformation of precision de-vices has been not yet *** this work,the phase field method was used to investigate the shape memory effects(SMEs)of NiTi SMAs undergoing grain size(GS)engineering,to obtain tunable one-way and stress-assisted two-way SMEs(OWSME and SATWSME).The OWSME and SATWSME of the systems with various gradient-nanograin structures and bimodal grain structure,as well as that with geometric gradients were *** simulated results indicate that due to the GS dependences of martensite transformation and reorientation,the occurrence and expansion of martensite reorientation,martensite transformation and its reverse can be efficaciously controlled via the GS *** combining the GS engineering and geometric gradient design,since the effects of GS and stress gradient can be su-perimposed or competing,and the responses of martensite reorientation,martensite transformation and its reverse to this are different,the OWSME and SATWSME of the geometrically graded systems with various nanograin structures can exhibit different improvements in *** short,the reorienta-tion hardening modulus during OWSME is increased and the transformation temperature window during SATWSME is widened by GS engineering,indicating the improved controllability of *** optimal GS engineering schemes revealed in this work provide the basic reference and guidance for designing tun-able SMEs and producing NiTi-based driving devices catering to desired functional performance in various engineering fields.

关键词： Phase field NiTi Shape memory effect Grain size engineering Geometric gradient

Decomposition mechanisms of nuclear-grade cationic exchange resin by advanced oxidation processes:Statistical molecular fragmentation model and DFT calculations

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Journal of Environmental Sciences 2024年第1期135卷 433-448页

作者： xiang Meng Pierre Désesquelles Lejin xu Department of Nuclear Engineering and Technology School of Energy and Power EngineeringHuazhong University of Science&TechnologyWuhan 430074China CNRS Laboratoire de Physique des Gaz et des PlasmasUniversitéParis-SaclayOrsay 91405France State Key Laboratory of Coal Combustion School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The treatment and disposal of radioactive waste are presently facing great *** ion exchange resins have become a focus of attention due to their high production and serious environmental *** this paper,a simplified model of cationic exchange resin is proposed,and the degradation processes of cationic resin monomer initiated by hydroxyl radicals(·OH)are clarified by combining statistical molecular fragmentation(SMF)model and density functional theory(DFT)*** prediction of active sites indicates that the S-O bonds and the C-S bond of the sulfonic group are more likely to react during the *** meta-position of the sulfonic group on the benzene ring is the most active site,and the benzene ring without the sulfonic group has a certain *** C11-C14 and C17-C20 bonds,on the carbon skeleton,are the most easily *** is also found that dihydroxy addition and elimination reactions play a major role in the process of desulfonation,carbon skeleton cleavage and benzene ring *** decomposition mechanisms found through the combination of physical models and chemical calculations,provide theoretical guidance for the treatment of complex polycyclic aromatic hydrocarbons.

关键词： Cationic exchange resin Statistical molecular fragmentation model Density functional theory Hydroxyl radical Decomposition mechanism

Adversarial data splitting for domain generalization

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Science China(Information Sciences) 2024年第5期67卷 28-42页

作者： xiang GU Jian SUN Zongben xu School of Mathematics and Statistics Xi'an Jiaotong University

Domain generalization aims to learn a model that is generalizable to an unseen target domain,which is a fundamental and challenging task in machine learning for out-of-distribution generalization. This paper proposes a novel domain generalization approach that enforces the learned model to be able to generalize well over the train/val subset splitting of the training dataset. This idea is modeled herein as an adversarial data splitting framework, formulated as a min-max optimization problem inspired by the metalearning approach. The min-max optimization problem is solved by iteratively splitting the training dataset into the training and val subsets to maximize the domain shift measured by the objective function and updating the model parameters to enable the model to generalize well from the training subset to the val subset by minimizing the objective function. This adversarial training approach does not assume the known domain labels of the training data; instead, it automatically investigates the “hard” splitting of the train/val subsets to learn the generalizable model. Extensive experimental results using three benchmark datasets demonstrate the superiority of this approach. In addition, we derive a generalization error bound for the theoretical understanding of our proposed approach.

关键词： domain generalization adversarial learning data splitting meta-learning out of distribution

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