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Core-rim structure,bi-solubility and a hierarchical phase relationship in hot-pressed ZrB2-SiC-MC ceramics(M=Nb,Hf,Ta,W)

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Journal of Materiomics 2021年第1期7卷 69-79页

作者： dong-Li Hu Hui Gu Ji Zou Qiang Zheng guo-Jun Zhang School of Materials Sciences and Engineering Materials Genome InstituteShanghai UniversityShanghai200444China State Key Laboratory of High Performance Ceramics and Superfine Microstructures Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China School of Metallurgy and Materials University of BirminghamB152TTUK CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing100190China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Research Institute of Function MaterialsDonghua UniversityShanghai201620China

Core-rim structures were identified as a common feature in hot-pressed ZrB2-SiC-MC ceramics(M=Nb,Hf,Ta and W)by a combination of X-ray diffraction,scanning and transmission electron *** analyses associate them with the bi-solubility of M in ZrB2 phase,in which transition of solubility across the core/rim boundary is abrupted,signifying their creation via dissolution-reprecipitation process facilitated by transient *** cores were retained from starting powder after surface melting and the rims were grown from the liquid-phase to incorporate more solutes,leaving the residual liquid to turn into ZrC phase with higher solubility of *** propose g-point scheme in the ZrB2-MB2 diagrams to combine the bi-solubility and the core-rim structures into an intra-phase relationship created by sintering,leading further to a hierarchical phase *** temperature dependence of flexural strength in the ZrB2-SiC-MC ceramics varies with MC additions,which can be respectively strengthened by the strain energy created in the core-rim structures and metal segregation to grain boundaries.

关键词： Ultra-high-temperature ceramics Core-rim structures Bi-solubility Solution-reprecipitation process

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A Wnt10a-Notch signaling axis controls Hertwig’s epithelial root sheath cell behaviors during root furcation patterning

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International Journal of Oral Science 2024年第3期16卷 425-435页

作者： Kai Sun Miao Yu Jiayu Wang Hu Zhao Haochen liu Hailan Feng Yang liu dong Han Department of Prosthodontics Peking University School and Hospital of Stomatology&National Center for Stomatology&National Clinical Research Center for Oral Diseases&National Engineering Research Center of Oral Biomaterials and Digital Medical DevicesBeijingChina Chinese Institute for Brain Research BeijingChina

Human with bi-allelic WNT10A mutations and epithelial Wnt10a knockout mice present enlarged pulp chamber and apical displacement of the root furcation of multi-rooted teeth,known as taurodontism;thus,indicating the critical role of Wnt10a in tooth root ***,the endogenous mechanism by which epithelial Wnt10a regulates Hertwig’s epithelial root sheath(HERS)cellular behaviors and contributes to root furcation patterning remains *** this study,we found that HERS in the presumptive root furcating region failed to elongate at an appropriate horizontal level in K14-Cre;Wnt10a^(fl/fl)mice from post-natal day 0.5(PN0.5)to *** assays and immunofluorescent staining of cyclin D1 revealed significantly decreased proliferation activity of inner enamel epithelial(IEE)cells of HERS in K14-Cre;Wnt10a^(fl/fl)mice at PN2.5 and *** staining of E-Cadherin and acetyl-α-Tubulin demonstrated that the IEE cells of HERS tended to divide perpendicularly to the horizontal plane,which impaired the horizontal extension of HERS in the presumptive root furcating region of K14-Cre;Wnt10a^(fl/fl)***-seq and immunofluorescence showed that the expressions of Jag1 and Notch2 were downregulated in IEE cells of HERS in K14-Cre;Wnt10a^(fl/fl)***,after activation of Notch signaling in K14-Cre;Wnt10a^(fl/fl)molars by Notch2 adenovirus and kidney capsule grafts,the root furcation defect was partially *** together,our study demonstrates that an epithelial Wnt10a-Notch signaling axis is crucial for modulating HERS cell proper proliferation and horizontal-oriented division during tooth root furcation morphogenesis.

关键词： Wnt10a Notch impaired

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Meson Cloud Effect on △(1232) Resonance Transition Properties with a Relativistic Quark Model Approach

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Communications in Theoretical Physics 2002年第7期38卷 53-58页

作者： dong Yu-Bing FENG Qing-guo Institute of High Energy Physics Academia Sinica P.O. Box 9184-1 Beijing 100039 China Institute of High Energy Physics Academia Sinica P.O. Box 9184-1 Beijing 100039 China

Based on a relativistic quark model approach, the transition properties of the first nucleon resonance △(1232), and the coupling constants gπNN, g△πN are investigated. Tvo different vays to remove the center of mass motion are considered. The results of the relativistic approaches with and without center ofmass correction are compared with those of nonrelativistic constituent quark model. Moreover, pion meson cloud effect on these calculated observables is explicitly addressed. Better results are obtained by taking the pion meson cloud into account.

关键词： relativistic quark model, △(1232), coupling constants, meson cloud, decay width

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Telomere elongation in parthenogenetic stem cells

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Protein & Cell 2014年第1期5卷 8-11页

作者： Yu Yin Na liu Xiaoying Ye Renpeng guo Jie Hao Fang Wang Lin liu State Key Laboratory of Medicinal Chemical Biology Department of Cell Biology and GeneticsCollege of Life SciencesNankai UniversityTianjin 300071China

Dear Editor, Parthenogenetic embryonic stem （pES） cells, generated from oocytes by artificial activation without involvement of fertilization, show differentiation and pluripotency as evi- denced by their capacity to generate germline chimeras and all pES pups by tetraploid embryo complementation, indi- cating the ability of pES cells to form all cell types in the body （Chen et al., 2009; liu et al., 2011）. Indeed, pES cells can repair injured muscle （Koh et al., 2009） and cardiomyocytes with reduced risk of tumorigenesis （liu et al., 2013）,

关键词： Telomere elongation parthenogenetic stem cells artificial activation

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Regulating the inner Helmholtz plane structure at the electrolyte-electrode interface for highly reversible aqueous Zn batteries

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Journal of Energy Chemistry 2024年第8期95卷 57-67,I0002页

作者： Jianghe liu Sanlue Hu Hexin guo guobin Zhang Wen liu Jianwei Zhao Shenhua Song Cuiping Han Baohua Li Shenzhen Key Laboratory on Power Battery Safety and Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055GuangdongChina Shenzhen Key Laboratory of Advanced Materials School of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen 518055GuangdongChina Faculty of Materials Science and Energy Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina Shenzhen HUASUAN Technology Co. Ltd.Shenzhen 518055GuangdongChina

The development of aqueous Zn batteries is limited by parasitic water reactions,corrosion,and dendrite *** address these challenges,an inner Helmholtz plane(IHP)regulation method is proposed by employing low-cost,non-toxic maltitol as the electrolyte *** preferential adsorption behavior of maltitol can expel the water from the inner Helmholtz plane,and thus hinder the immediate contact between Zn metal and H_(2)***,strong interaction between maltitol and H_(2)O molecules can restrain the activity of H_(2)***,the"IHP adsorption effect"along with the low LUMO energy level of maltitol-CF_(3)SO_(3)^(-)can promote the in-situ formation of an organic-inorganic complex solid electrolyte interface(SEI)*** a result,the hydrogen/oxygen evolution side reaction,corrosion,and dendrites issues are effectively suppressed,thereby leading to highly reversible and dendrite-free Zn plating/*** Zn‖I_(2)battery with hybrid electrolytes also demonstrates high electrochemical performance and ultralong cycling stability,showing a capacity retention of 75%over 20000 charge-discharge cycles at a large current density of 5 A g^(-1).In addition,the capacity of the device has almost no obvious decay over20000 cycles even at-30℃.This work offers a successful electrolyte regulation strategy via the IHP adsorption effect to design electrolytes for high-performance rechargeable Zn-ion batteries.

关键词： Inner Helmholtz plane Adsorption effect Dendrite suppression SEI layer Zn||I_(2)battery

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Automatic estimation of traveltime parameters in VTI mediausing similarity-weighted clustering

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Petroleum Science 2020年第2期17卷 363-375页

作者： Shi-You liu Ying-Zhao Zhang Chao Li Wan-Yuan Sun Gang Fang guo-Chang liu Zhanjiang Branch China National Offshore Oil Corporation Ltd.Zhanjiang 524000GuangdongChina State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology Ministry of Land and ResourcesQingdao Institute of Marine GeologyChina Geological SurveyQingdao 266071ShandongChina

Compared with hyperbolic velocity estimation methods,nonhyperbolic methods(such as shifted hyperbola)are better choices for large offsets or vertical transverse isotropy(VTI)*** local seismic event slope contains subsurface information,they can be used to estimate zero-offset two-way traveltime and normal moveout *** traditional velocity estimation methods require a great deal of manual work and are also prone to human *** order to estimate the traveltime parameters for VTI media automatically,in this paper,we propose to use predictive painting and similarity-weighted clustering to obtain traveltime *** predictive painting is used to estimate zero-offset two-way traveltime,and the shifted-hyperbola traveltime equation is used to obtain velocity and anisotropy *** first map local slopes to zero-offset two-way traveltime and moveout-parameters domain and then use similarity-weightedk-means clustering to find the maximum likelihood anisotropy parameters of the main subsurface *** order to demonstrate that,we apply the similarity-weighted clustering method to synthetic and field data examples and the results are of higher accuracy when compared to the ones obtained using multiparameter semblance-based *** estimation error section,it can be seen that the estimation error of multiparameter semblance-based method is about 3-5 times that of the proposed method.

关键词： Nonhyperbolic moveout Predictive painting k-means clustering Seismic velocity analysis Vertical transverse isotropy

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Promotion and Inhibition of Ruminal Epithelium Growth by Butyric Acid and Insulin-Like Growth Factor-1(IGF-1) in Dairy Goats

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Journal of Integrative Agriculture 2014年第9期13卷 2005-2009页

作者： liu Da-cheng ZHOU Xiang-li liu guo-juan GAO Min HU Hong-lian College of Veterinary Medicine Inner Mongolia Agricultural University Key Laboratory of Clinical Diagnosis and Treatment Technology in Animal Disease Ministry of Agriculture Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences

Isolated ruminal epithelia from caudal blind sacs of dairy goats were incubated with butyrate and insulin-like growth factor-1（IGF-1） at different concentrations. Proportions of ruminal epithelium in different phases of the cell division cycle were determined by flow cytometric analysis. The proportion of epithelial cells in S phase and G2-M phase（PS＆G2-M） increased significantly（P〈0.01） whereas the proportion of epithelial cells in G0-G1 phase（PG0-G1） decreased after incubation with IGF-1. PS＆G2-M decreased whereas PG0-G1 increased markedly（P〈0.01） after incubation with sodium butyrate. PS＆G2-M incubated with IGF-1 and butyrate sodium together increased more than that incubated with IGF-1 alone; PG0-G1, however, decreased significantly（P〈0.01）. Our results indicate that IGF-1 enhances whereas sodium butyrate inhibits the proliferation of rumen epithelial cells. Furthermore, butyrate and IGF-1, together, have a synergic effect on the proliferation of rumen epithelium.

关键词： butyrate IGF-1 rumen epithelium

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Influence of Isotope Substitution Helium Atom on Partial Cross Sections in He-HF Collisions

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Communications in Theoretical Physics 2009年第11期52卷 924-928页

作者： YU Chun-Ri ZHANG Jie CHEN Li JIANG Gui-Sheng HUANG guo-dong School of Physics ＆ Electric Engineering Anqing Teachers College Anqing 246133 China

Close-coupling equation and anisotropic potential developed in our previous research are applied to HE-SHe （4He, 6He, 8He,10He） collision system, and partial cross sections （PCSs） at the incident energy of 40 me V are calculated. By analyzing the differences of these PCSs, change rules of PCSs with the increase of partial wave number, and with the change of the mass of isotope substitution helium atom are obtained. The results show that excitation PCSs converge faster than elastic PCSs for collision energy and each of systems considered here. Also excitation PCSs converge more rapidly for high-excited states. Tail effect is present only in elastic scattering and low-excited states but not in high- excited states. With the increase of the mass of isotope substitution helium atom, converging speed of elastic, total inelastic, and state-to-state excitation PCS slows down, and the maxima of these PCSs undergoes a regular change.

关键词： isotope substitution partial cross section close-coupling equation He-HF collision

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Conserved Spatiotemporal Dynamics with Millisecond Precision During Reverberatory Activity in a Self-organized Neuronal

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Neuroscience Bulletin 2023年第5期39卷 808-812页

作者： dong-Qing Shi Fang Xu guo-Qiang Bi Pak-Ming Lau Division of Life Sciences and Medicine University of Science and Technology of ChinaHefei 230026China Interdisciplinary Center for Brain Information The BrainCognition and Brain Disease InstituteShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China

Dear Editor,The timing of spiking activity across neurons is believed to play an important role in information coding in brain circuits1[1].At the cellular level,neurons can fire spikes with millisecond precision and the relative timing of pre-and postsynaptic spikes can determine the direction and extent of synaptic modification[2].When such spike-timing-dependent plasticity(STDP)and other physiological and anatomical properties are implemented in theoretical models,the simulated networks of interconnected spiking neurons exhibit neuronal groups with stereotypical time-locked spatiotemporal firing patterns with millisecond temporal precision[3].

关键词： second organized timing

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Effects of interface adhesive and resin cohesive strength on tensile strength of resin sand based on numerical analysis

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China Foundry 2019年第6期16卷 406-413页

作者： Yun-dong Ji Zi-han liu Kai-dong Zheng Jia-bo Li Hai-xiao Hu dong-feng Cao School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Zhangwu Country Lian Xin Foundry Silica Sand Co. Ltd.Fuxin 123200China

A plane-strain unit-cell finite element model was proposed to study the effects of resin/sand interface adhesive and resin cohesive strength on the overall tensile strength of resin sand,as well as the fracture *** main micro-scale characteristics of the numerical model were extracted from the micrograph of resin sand specimens by three-dimensional X-ray microscopy(3 D-XRM).The extended finite element method(XFEM)and cohesive behavior method were employed to explicitly describe the resin fracture and sand/resin interface debonding,*** corresponding experimental observation of micro-scale failure behavior based on the scanning electron microscopy(SEM)was presented for a *** numerical results show that the initial failure of the model occurs at the sand/resin interface,followed by consequent resin *** on the resin cohesive strength,the location of resin failure varies from the central zones to resin neck arc zones.A typical mixed mode fracture is observed,which is consistent with the corresponding micro-scale experimental *** the resin cohesive strength ranges between 8 and 12 MPa,the resin cracks occur at the central zone of resin bridges and propagate perpendicularly to the tensile direction until through cracks *** a higher range(between 12 and 16 MPa),interface cracks cross with resin cracks,bonding bridges of resin sand are *** interface adhesive strength has a more significant effect on the overall tensile strength of resin sand than the resin cohesive *** overall tensile strength of resin sand increases first then keeps stable with the increase of the resin cohesive *** work attempts to establish a numerical model which accurately describes the complicated mixed mode fracture of resin sand,which is beneficial to understand deeply the fracture mechanism of resin sand.

关键词： resin sand microstructure interface debonding resin crack fracture mode

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