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Study on the Constitutive Model of Marble Based on the Conventional Triaxial Compression Test

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上海交通大学学报 2004年第Z2期38卷 8-13页

作者： Tian Sheng-li lu Yun-de Ge Xiu-run School of Civil Engineering and Mechanics Shanghai Jiaotong University Shanghai200240China School of Civil Engineering and Mechanics Shanghai Jiaotong University Shanghai200240China School of Civil Engineering and Mechanics Shanghai Jiaotong University Shanghai200240China Institute of Rock and Soil Mechanics The Chinese Academy of Sciences Wuhan430071 China

The RMB-150B rock mechanics test system was employed to obtain the complete stress-strain test curves under confining pressures of 0-30MPa for marble samples from Ya'an ,Sichuan province. On the basis of former study and the convention triaxial pressure test results ,the complete procedures curves which described the relationships between yielding strength、 peak strength、 residual strength and confining pressure was obtained. Taking the strain softening of rock into account, the bilinear elastic-linear softening-residual perfect plasticity four-linear model was put forward in this paper on the basis of the test results and theory of plasticity. This model was adopted to describe the behaviors of marble in different phases under triaxial compression with the constitutive equation of strain softening phase as focus. The results indicated that the theoretic model fitted in well with the test results.

关键词： theory of plasticity conventional triaxial compression test constitutive model control equation linear softening bilinear elastic

The Progenitors of Type Ia Supernovae with Asymptotic Giant Branch Donors

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Research in Astronomy and Astrophysics 2023年第7期23卷 118-125页

作者： lu-Han li Dong-Dong liu Bo Wang Yunnan Observatories Chinese Academy of SciencesKunming 650216China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of SciencesKunming 650216China International Centre of Supernovae Yunnan Key LaboratoryKunming 650216China University of Chinese Academy of Sciences Beijing 100049China

TypeⅠa supernovae(SNe Ia)are among the most energetic events in the *** are excellent cosmological distance indicators due to the remarkable homogeneity of their light ***,the nature of the progenitors of SNeⅠa is still not well *** the single-degenerate model,a carbon-oxygen white dwarf(CO WD)could grow its mass by accreting material from an asymptotic giant branch(AGB)star,leading to the formation of SNe Ia when the mass of the WD approaches to the Chandrasekhar-mass limit,known as the AGB donor *** this channel,previous studies mainly concentrate on the wind-accretion pathway for the mass-increase of the *** the present work,we employed an integrated mass-transfer prescription for the semidetached WD+AGB systems,and evolved a number of WD+AGB systems for the formation of SNe Ia through the Roche-lobe overflow process or the wind-accretion *** provided the initial and final parameter spaces of WD+AGB systems for producing SNe *** also obtained the density distribution of circumstellar matter at the moment when the WD mass reaches the Chandrasekhar-mass ***,we found that the massive WD+AGB sample AT 2019qyl can be covered by the final parameter space for producing SNe Ia,indicating that AT 2019qyl is a strong progenitor candidate of SNe Ia with AGB donors.

关键词： stars:evolution (stars:)supernovae:general (stars:)binaries(including multiple):close (stars:)white dwarfs

Plight and Path of Rural Collaborative Governance from the Subjective Perspective of Epistemology

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学术界 2018年第6期 234-245页

作者： Shu Yongjiu li lu College of Marxism Sichuan Agricultural University Yaan Sichuan 625014

It has become a trend for rural areas to develop from unified governance to multi-body *** goal of rural governance modernization further aggravates the non-applicability of the current system of"township administration and villager's self-government".And the problems such as the inaccurate positioning among the bodies of rural governance,the mismatching of power and responsibility,and the imperfectness of collaborative governance mechanism are becoming more and more obvious,which seriously restricts the development of rural economy and ***,the root of the rural collaborative governance plight lies in the inadequate understanding on the of governance *** key to get out of the plight is the implementation of rural revitalization strategy,cultivation of new farmers,and collaboration ***,rural governance should not be limited to the administrative village area,but be collectively governed by village,inter-village,urban and rural *** paper reunderstands the rural governance bodies,explores the plight and the root of rural collaborative governance,and puts forward an effective path for rural collaborative governance,all from the subjective perspective of epistemology.

关键词：农村合作认识论路径现代化适用性不完全身体

Monolayer MoS_(2) epitaxy

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Nano Research 2021年第6期14卷 1598-1608页

作者： Zheng Wei Qinqin Wang lu li Rong Yang Guangyu Zhang Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing100190China Songshan Lake Materials Laboratory Dongguan523808China

As an emerging two-dimensional(2D)semiconductor material,monolayer MoS2 has recently attracted considerable *** promising applications of this material have been proposed for electronics,optoelectronics,sensing,catalysis,energy storage,and so *** realize these practical applications,high-quality and large-area MoS2 with controllable properties is *** the many different synthesis techniques,epitaxy provides a promising route for producing MoS2 ***,we review the epitaxial growth of monolayer MoS2 on various substrates,with a particular focus on large-scale films with large domain sizes and high domain ***,we offer perspectives and challenges for future research and applications of this technology.

关键词： monolayer MoS_(2) epitaxy domain size domain alignment heterostructures

Emerging prospects of protein/peptide-based nanoassemblies for drug delivery and vaccine development

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Nano Research 2022年第8期15卷 7267-7285页

作者： Taiyu liu lu li Cheng Cheng Bingfang He Tianyue Jiang School of Pharmaceutical Sciences Nanjing Tech UniversityNanjing 211816China

Proteins have been widely used in the biomedical field because of their well-defined architecture,accurate molecular weight,excellent biocompatibility and biodegradability,and *** by the wisdom of nature,increasing proteins/peptides that possess self-assembling capabilities have been explored and designed to generate nanoassemblies with unique structure and function,including spatially organized conformation,passive and active targeting,stimuli-responsiveness,and high *** characteristics make protein/peptide-based nanoassembly an ideal platform for drug delivery and vaccine *** this review,we focus on recent advances in subsistent protein/peptide-based nanoassemblies,including protein nanocages,virus-like particles,self-assemblable natural proteins,and self-assemblable artificial *** origin and characteristics of various protein/peptide-based assemblies and their applications in drug delivery and vaccine development are *** the end,the prospects and challenges are discussed for the further development of protein/peptide-based nanoassemblies.

关键词： drug delivery vaccine protein/peptide self-assembly targeting controlled release

Theoretical Exploration about the Detonation Performance and Thermal Stability of the Nitro-substituted Derivatives of Guanine

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Chinese Journal of Structural Chemistry 2021年第4期40卷 409-414,405页

作者： li Bu-Tong li lu-lin PENG Ju School of Chemistry and Materials Science Guizhou Education UniversityGuiyang 550018China

The nitro-substituted derivatives of guanine are designed and calculated to explore novel high energy density *** explore the thermal stability of title molecules,the heat of formation(HOF),bond dissociation energy(BDE),and bond order of the trigger bond are *** predict the possibility used as high energy density compounds,the detonation pressure(P),detonation velocity(D),explosive heat(Q),and crystal density(ρ)are calculated by using the classical Kamlet-Jacobs(K-J)*** on our calculations,E(D=8.93 km/s,P=37.21 GPa)is confirmed as the potential high energy density compound.

关键词： high energy density compounds Kamlet-Jacobs equation density function theory guanine derivatives

Protein adsorption on the poly(L-lactic acid) surface modified by chitosan and its derivatives

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Chinese Science Bulletin 2009年第18期54卷 3167-3173页

作者： JIAO YanPeng ZHOU ChangRen li liHua DING Shan lu lu luO BingHong li Hong Department of Materials Science and Engineering Jinan University Guangzhou China 510632

Surface modification of biomaterials has been adopted over the years to improve their biocompatibility. In this study, aiming to promote hydrophilicity and to introduce natural recognition sites onto poly(L-lactic acid) (PLLA) films, chitosan and its derivatives, carboxymethyl chitosan(CMC) and N-methylene phosphonic chitosan (NPC), were used to modify the surface of PLLA films by an entrapment method. Radiolabeled (125I) proteins were used to measure the amount of protein adsorbed to PLLA surfaces. Fibronectin (Fn) was used to study the protein adsorption on the modified PLLA surfaces, including isotherm adsorption and adsorption kinetics of single protein, competitive adsorption of binary proteins system and serum multi-proteins and the desorption behavior in serum solution. The results showed that in the isotherm adsorption, Fn had a larger adsorption capacity on the CS-modified surface at lower concentrations, but had a high adsorption capacity at CMC-modified surface at higher concentrations. In the study of absorption kinetics, Fn had a fastest adsorption equilibrium and a highest equilibrium adsorption capacity at the CS-modified surface, while it was opposite at the PCS-modified surface. When BSA and serum were added, it had the greatest effect on the adsorption of Fn on the PCS-modified surface. After 6 hours soaking in the desorption study, Fn had reached desorption equilibrium on all the modified surfaces, which had different effects on the desorption rate and the remaining percentage of Fn.

关键词：材料表面改性蛋白质吸附改性壳聚糖聚乳酸衍生物羧甲基壳聚糖 125I标记纤维连接蛋白

Meeting report:The second Tianjin Forum on tumor microenvironment,Tianjin,China,June 22-24,2012

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Protein & Cell 2012年第8期3卷 561-563页

作者： Qiangzhe Zhang lu-Yuan li College of Pharmacy Nankai UniversityTianjin 300071China State Key Laboratory of Medicinal Chemical Biology Tianjin 300071China

The second Tianjin Forum on tumor microenvironment was held at Nankai University,Tianjin,China,from June 22 to June 24,*** 300 scientists and students attended the forum,which included 28 presentations by researchers from Asia,America,and Europe on a wide variety of multid-isciplinary issues regarding microenvironment impact on metastasis,tumor vasculature,inflammation and carcino-genesis,bone microenvironment,and cell-cell signaling.

关键词： microenvironment inflammation metastasis

Bead-like cobalt-nitrogen co-doped carbon nanocage/carbon nanofiber composite:A high-performance oxygen reduction electrocatalyst for zinc-air batteries

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Nano Research 2023年第1期16卷 545-554页

作者： Bo Zhang Yige Zhao lu li Yukun li Jin Zhang Guosheng Shao Peng Zhang State Center for International Cooperation on Designer Low-carbon and Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical TechnologyBeijing 100029China

Proper regulation of metal-nitrogen carbon(M-N-C)materials derived from zeolitic imidazolate frameworks(ZIFs)is essential to enhance the oxygen reduction reaction(ORR)***,most of the reports focus on the component regulation,and the structure regulation of ZIFs-derived M-N-C materials by a simple preparation method has been barely ***,using a one-step electrospinning method with subsequent pyrolysis,we have prepared a bead-like cobalt-nitrogen co-doped carbon nanocage/carbon nanofiber(Co-N-C/CNF)composite electrocatalyst with the porous carbon nanocages arranged one by one in the highly conductive carbon *** from the fully exposed active sites and improved conductivity,the Co-NC/CNF catalyst exhibits an excellent ORR performance even surpassing the commercial Pt/C *** functional theory(DFT)results demonstrate that the CoNP-N1-C2 active sites on Co-N-C/CNF make the core contribution to the improvement of ORR ***,the zinc-air battery(ZAB)based on the Co-N-C/CNF catalyst also shows outstanding discharge *** study provides a new strategy for the preparation and structural design for ZIFs-derived M-N-C materials as efficient ORR catalysts.

关键词： bead-like structure carbon nanocages electrospinning technology oxygen reduction reaction zinc−air battery