检索结果-南通市图书馆

Journal of integrative Agriculture 2019年第7期18卷 1587-1603页

作者： WAng Shao-xi SHi Feng-yan dong xi.ng-xi.ng li Yu-xi.ng ZHAng zhi-hong li He College of Horticulture Shenyang Agricultural University/Liaoning Key Laboratory of Strawberry Breeding and Cultivation

Auxin signaling plays a significant role in the whole process of plant growth and development from embryogenesis to *** response factors(ARFs) are reported to regulate the expression of auxin response genes by binding to auxin response *** is the most critical transcription factor family which has been released in most species,but few reports in *** this study,the structure characterization of 12 FvARF genes in strawberry,their expression patterns at different development stages,different organizations,and different indole-3-acetic acid(iAA) treatments were *** expression of 12 FvARFs was found in all experiment tissues and showed almost the same trend during fruit *** FvARFs respond to the treatment of *** study provides comprehensive information on ARF family in strawberry,including gene structures,chromosome locations,phylogenetic relationships and expression *** information on FvARF genes paves the way for future research on strawberry ARF genes.

关键词： auxin auxin response factor Fragaria vesca gene structure gene expression

Populations of Bright X-ray Sources in the Starburst galaxies ngC 4038/4039

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and Astrophysics 2007年第3期7卷 389-396页

作者： xi-Wei liu xi.ng-dong li Department of Astronomy Nanjing University Nanjing 210093

Assuming a naive star formation history, we construct synthetic X-ray source populations, using a population synthesis code, for comparison with the observed X-ray luminosity function （XLF） of the interacting galaxies ngC 4038/4039. We have included highand intermediate-mass X-ray binaries, young rotation-powered pulsars and fallback disk-fed black holes in modeling the bright X-ray sources detected. We find that the majority of the X-ray sources are likely to be intermediate-mass X-ray binaries, but for typical binary evolu- tion parameters, the predicted XLF seems to be steeper than observed. We note that the shape of the XLFs depends critically on the existence of XLF break for young populations, and suggest super-Eddington accretion luminosities or the existence of intermediate-mass black holes to account for the high luminosity end and the slope of the XLF in ngC 4038/4039.

关键词： binaries close - galaxies individual (ngC 4038/4039) - stars evolution -X-ray binaries

A picture of pseudogap phase related to charge fluxes

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2020年第1期6卷 791-802页

作者： xi Chen Jiahao dong xin li John A.Paulson School of Engineering and Applied Sciences Harvard University29 Oxford StCambridgeMA 02138USA

Recently,charge density fluctuations or charge fluxes attract strong interests in understanding the unconventional *** this paper,a new emergent configuration in cuprates is identified by density functional theory simulations,called the charge pseudoplane,which exhibits the property of confining the dynamic charge fluxes for higher superconducting transition *** further redefines the fundamental collective excitation in cuprates as pQon with the momentumdependent and ultrafast localization-delocalization *** is shown that both pseudogap and superconducting phases can be born from and intertwined through the charge flux confinement property of the charge pseudoplane *** experimental simulations based on the new picture provide good agreements with previous angle resolved photoemission spectroscopy and scanning tunneling microscopy *** work thus opens a new perspective into the origin of the pseudogap phase and other related phases in cuprates,and further provides a critical descriptor to search and design higher temperature superconductors.

关键词： charge property phase

Viscosity Measurements of Fe-Si-B-Cu-Nb-C Metallic glass Melts by an Oscillating Crucible Method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2003年第3期20卷 395-397页

作者： li Cheng-dong Tian Xue-Lei Chen xi-Chen A.g. ilinsky Key Laboratory of liquid Structure and Heredity of Materials Ministry of Education Shandong University Ji'nan 250061 institute of Metal Physics National Academy of Sciences Ukraine Ukr 36 Vernadsky Blvd. UA-03680 Kiev Ukraine

Dependence of the dynamic viscosity of new type of Fe-based amorphous alloy (Fe68.5Si13.5B9Cu1Nb3C5) melt on temperature is investigated by using a torsional oscillation viscometer. The temperature dependence of the viscosity can be fitted by the Arrhenius relation and Fulcher expression as ln η = 0.082 + 1463.48/T and ln η = 6.75×10-5 + 954.71/(T-608.36), where η is the viscosity in units of cP and T is the temperature in units of K. The results show that the Arrhenius relation is more suitable in high temperature region, while the Fulcher expression is more appropriate in undercooled region. Combining the Differential scanning calorimetry data and free-volume model, the glass forming ability of Fe68.5Si13.5B9Cu1Nb3C5 alloy is discussed.

关键词： Viscosity

The Differentiated Effect of Administrative Policy in China’s Housing Market——Based on the Heterogeneous Households Multi-Agent Model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2020年第1期33卷 167-195页

作者： liU Jiajia DAi Wei li xiuting dong zhi dong Jichang School of Economics and Management Beijing University of Chemical TechnologyBeijing 100029China School of Economics and Management University of Chinese Academy of SciencesBeijing 100190China

Since 2010,Chinese government has introduced a series of administrative policies to limit speculation in the housing market to stabilize price fluctuations and keep the housing market in a healthy state of *** order to investigate whether administrative policy can play its due role,this paper constructs a comprehensive bottom-up housing market heterogeneous households multiagent model(HHMAM)to undertake research on the differentiated effect of administrative policy in different *** empirical studies find that:1)Administrative policy that increases interest rates will cause housing prices to continue to decline in the long term,but they will resume a rising trend after reaching the lowest point;2)if the government cancels a property-purchasing limitation,housing prices will continue to rise;and 3)investors tend to invest in 1st-tier cities due to the high demand and greater likelihood of appreciation in these cities.

关键词： Administrative policy consumer behavior heterogeneous households multi-agent model housing prices regional differentiation

Ti_(3)C_(2)MXene:recent progress in its fundamentals,synthesis,and applications

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第10期41卷 3268-3300页

作者： Wei-xin Huang zhi-Peng li dong-dong li zhi-Hui Hu Chao Wu Kang-Le Lv Qin li South-Central Minzu University Wuhan430074China Wuhan Research institute of Materials Protection Wuhan430000China

in this rapidly developing society,it is always crucial to exploit new materials with suitable properties to meet specific application ***-dimensional(2 D)transition metal carbon/nitrides(MXenes)are a novel graphene-like material with exciting research potential in recent *** them,Ti_(3)C_(2)debuts in a central position due to its relatively longer research history,mature synthetic process,and incredibly rich store of merits,such as good flexibility,large specific surface area,abundant termination groups,excellent electrical conductivity,and light-to-heat conversion *** this review,recent research progress on Ti_(3)C_(2)MXene and its composites was updated mainly from three aspects,including their fundamentals,synthesis,and *** has been found that diverse applications of Ti3 C2-based composites are inseparable and correlated with each other,which were linked by their unique physicochemical *** the end,a summary and a perspective on future opportunities and challenges of Ti_(3)C_(2)were given to offer theoretical and technical guidelines for further investigation on MXene family.

关键词： Ti_(3)C_(2)MXene Delamination Biomedicine Battery and supercapacitor Sensor Photocatalyst

Cloning of 3H11 mAb variable region gene and expression of 3H11 human-mouse chimeric light chain

在线全文

学校读者我要写书评

暂无评论

World Journal of gastroenterology 1998年第1期4卷 46-49页

作者： li Jing WAng Yan li Quan-xi WAng Ya-Ming XU Jian-Jun dong zhi-Wei 不详

iM To clone mouse antihuman gastric cancer mAb(3H11) variable genes and to construct 3H11 humanmouse chimeric antibody.METHODS The entire VH and VL genes of antigastric cancer mAb 3H11 were cloned by RTPCR method from 3H11 hybridoma cells, using 5′ primers for leader sequences. The 3H11 VL gene was then inserted into humanmouse chimeric light chain expression vector and transfected into murine Sp2/0 myeloma cells.RESULTS DNA sequence analysis indicated that the cloned genes included the whole leader sequences and the mature ig variable region encoding sequences. After gene transfection, transient expression of chimeric light chain protein was detected.CONCLUSiON DNA sequences and transient expression indicated that the cloned gene was functional. This work laid basis for constructing 3H11 humanmouse chimeric antibody in the future..

关键词： gene,expression stomach neoplasms antibodies,monoclonal chimeric antibody

Effects of holding time and Zener-Hollomon parameters on deformation behavior of cast Mg-8gd-3Y alloy during double-pass hot compression

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2018年第11期34卷 2035-2041页

作者： xi Nie Shuai dong Fenghua Wang li Jin Jie dong National Engineering Research Center of light Alloy Net Forming School of Material Sciences and EngineeringShanghai Jiao Tong University

Double-pass hot compression tests were carried out over a wide range of holding time（0–180 s） and Zener-Hollomon parameter（1.6 E15–1.3 E20） to study the deformation behavior of cast Mg-8 gd-3 Y *** flow curves show obvious work hardening and strain softening stages, leading to the peak stress of double-pass hot compression. Holding time and Zener-Hollomon parameter can significantly affect the second pass peak stress. it is found that increasing the holding time can cause a higher peak stress in the second pass deformation. The second pass stress reaches the peak stress of 71 MPa at ZenerHollomom parameter of 1.6 E15. When the parameter rises to 1.3 E20, the second pass peak goes up to237 MPa. in addition, the second pass peak stress is significantly higher than the unloading stress, which is opposite to the flow behavior of aluminum alloys. Residual stored deformation energy caused by the first pass deformation could be consumed by metadynamic recrystallization. Therefore, more strain energy is required for subsequent dynamic recrystallization, resulting in hardening behavior. A hardening fraction is defined to describe the deformation behavior quantitatively, which shows a positive correlation with the metadynamic recrystallization fraction. The metadynamic recrystallization leads to grain growth at the inter pass holding stage, diminishing dynamic recrystallization nucleation positions in the second pass deformation.

关键词： Mg-8gd-3Y magnesium alloy Double pass hot compression Deformation behavior Metadynamic recrystallization

Damage of multi-layer spaced metallic target plates impacted by radial layered PELE

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2020年第1期16卷 201-207页

作者： Chun Cheng Zhong-hua Du xi Chen li-zhi Xu Cheng-xin Du Ji-long Han xiao-dong Wang School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China

Three different kinds of PELE(the penetrator with lateral efficiency) were launched by ballistic artillery to impact the multi-layer spaced metal target *** lmpact velocities of the projectiles were measured by the velocity measuring *** damage degree and process of each laye r of target plate impacted by the three kinds of projectiles were *** experimental results show that all the three kinds of projectiles have the effect of expanding holes on the multi-layer spaced metal target *** the normal structure PELE(without layered) with tungsten alloy jacket and the radial layered PELE with tungsten alloy jacket,the diameters of holes on the seco nd layer of plates are 3.36 times and 3.76 times of the diameter of the projectile,re *** radial layered PELE with W/Zr-based amorphous composite jacket,due to the large number of tungsten wires dispersed after the impact,the diameter of the holes on the four-layer spaced plates can reach 2.4 times,3.04 times,5.36 times and 2.68 times of the diameter of the ***,the normal structure PELE with tungsten alloy jacket and the radial layered PELE whit tungsten alloy jacket formed a large number of fragments impact marks on the third target *** the number of fragments penetrating the third target plate is not as large as that of the normal structure PELE,the area of dispersion of fragments impact craters on the third target plate is larger by the radial layered *** radial layered PELE with W/Zr-based amorphous composite jacket released a lot of heat energy due to the impact of the matrix material,and formed a large area of ablation marks on the last three target plates.

关键词： PELE(the penetrator with lateral efficiency) Multi-layer spaced metal target plates impact Damage

Anefficient parallel and distributed solution to nonconvex penalized linear SVMs

在线全文

学校读者我要写书评

暂无评论

Frontiers of information Technology & Electronic Engineering 2020年第4期21卷 587-603页

作者： Lei gUAN Tao SUN lin-bo QiAO zhi-hui YAng dong-sheng li Ke-shi gE xi-cheng LU College of Computer National University of Defense TechnologyChangsha 410073China School of Computer Science Fudan UniversityShanghai 201203China Shanghai Key Laboratory of Data Science Shanghai 201203China

Support vector machines(SVMs)have been recognized as a powerful tool to perform linear *** combined with the sparsity-inducing nonconvex penalty,SVMs can perform classification and variable selection ***,the nonconvex penalized SVMs in general cannot be solved globally and efficiently due to their nondifferentiability,nonconvexity,and *** solutions to the nonconvex penalized SVMs typically solve this problem in a serial fashion,which are unable to fully use the parallel computing power of modern multi-core *** the other hand,the fact that many real-world data are stored in a distributed manner urgently calls for a parallel and distributed solution to the nonconvex penalized *** circumvent this challenge,we propose an efficient alternating direction method of multipliers(ADMM)based algorithm that solves the nonconvex penalized SVMs in a parallel and distributed *** design many useful techniques to decrease the computation and synchronization cost of the proposed parallel *** time complexity analysis demonstrates the low time complexity of the proposed parallel ***,the convergence of the parallel algorithm is *** evaluations on four liBSVM benchmark datasets demonstrate the efficiency of the proposed parallel algorithm.

关键词： linear classification Support vector machine(SVM) Nonconvex penalty Alternating direction method of multipliers(ADMM) Parallel algorithm