检索结果-南通市图书馆

Morphological and physiological differences in heteromorphic leaves of male and female Populus euphratica Oliv.

在线全文

学校读者我要写书评

暂无评论

Journal of Arid Land 2022年第12期14卷 1456-1469页

作者： li xiu ZHAI Juntuan li Zhijun College of life Sciences and Technology Tarim UniversityAlar 843300China Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin of Xinjiang Production&Construction Corps Alar 843300China

Leaf traits can directly reflect the adaptation strategies of plants to the ***,there is limited knowledge on the adaptation strategies of heteromorphic leaves of male and female Populus euphratica *** response to individual developmental stages(i.e.,diameter class)and canopy height *** this study,morphological and physiological properties of heteromorphic leaves of male and female *** were *** showed that both male and female *** exhibited increased leaf area(LA),leaf dry weight(LDW),leaf thickness(LT),net photosynthetic rate(P_(n)),transpiration rate(T_(r)),stomatal conductance(g_(s)),proline(Pro),and malondialdehyde(MDA)concentration,decreased leaf shape index(li)and specific leaf area(SLA)with increasing diameter and canopy *** water potential(LWP)increased with increasing diameter,LWP decreased significantly with increasing canopy height in both sexes,and carbon isotope fraction(δ^(13)C)increased significantly with canopy height in both sexes,all of which showed obvious resistance ***,males showed greater LA,LT,P_(n),T_(r),and Pro than females at the same canopy height,and males showed significantly higher LA,SLA,LT,P_(n),T_(r),g_(s),and MDA,but lower LWP and δ_(1)3C than females at the same canopy height,suggesting that male *** have stronger photosynthetic and osmoregulatory abilities,and are sensitive to water ***,difference between male and female *** is closely related to the increase in individual diameter class and canopy *** summary,male plants showed higher stress tolerance than female plants,and differences in P_(n),g_(s),T_(r),Pro,MDA,δ_(13)C,and LWP between females and males were related to changes in leaf morphology,diameter class,and canopy *** results of this study provide a theory for the differences in growth adaptation strategies during individual development of ***.

关键词： arid area canopy height dioecious plants morphology physiological characteristics

Equilibrium Strategies in an Unobservable On-off Fluid Queue

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2022年第2期38卷 324-336页

作者： xiu-li XU Shuo WANG School of Science Yanshan UniversityQinhuangdao 060004China

This paper considers an on-off fluid queue *** on and off states of the system appear alternately,and the sojourn times at these two different states are independent,and each one follows an exponential *** fluid flows into the system buffer with some strategies to wait for the system service under the first-come first-served *** the system can process the fluid in the buffer only when the system is on *** given utility functions such as an expected average social profit,and an individual expected profit,the equilibrium strategies are characterized under both the fully unobservable case and the partially observable case.

关键词： fluid model on-off equilibrium strategies optimal benefit

Non-existence of Multi-peak Solutions to the Schrödinger-Newton System with L2-constraint

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2023年第4期39卷 868-877页

作者： Qing GUO li-xiu DUAN College of Science Minzu University of ChinaBeijing 100081China

In this paper, we are concerned with the the Schrödinger-Newton system with L^(2)-constraint. Precisely, we prove that there cannot exist multi-peak normalized solutions concentrating at k different critical points of V(x) under certain assumptions on asymptotic behavior of V(x) and its first derivatives near these points. Especially, the critical points of V(x) in this paper must be *** main tools are a local Pohozaev type of identity and the blow-up analysis. Our results also show that the asymptotic behavior of concentrated points to Schrödinger-Newton problem is quite different from the classical Schrödinger equations, which is mainly caused by the nonlocal term.

关键词： Schrödinger-Newton equation Non-existence Multi-peak solutions Normalized solutions Pohozaev identity

Low Dimensional Chaos from the Group Sunspot Numbers

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 435-440页

作者： Qi-xiu li Ke-Jun li National Astronomical Observatories / Yunnan Observatory Chinese Academy of Sciences Kunming 650011 Graduate School of Chinese Academy of Sciences Beijing 100049

We examine the nonlinear dynamical properties of the monthly smoothed group sunspot number Rg and find that the solar activity underlying the time series of Rg is globally governed by a low-dimensional chaotic attractor. This finding is consistent with the nonlinear study results of the monthly Wolf sunspot numbers. We estimate the maximal Lyaponuv exponent （MLE） for the Rg series to be positive and to equal approximately 0.0187 ± 0.0023 （month^- 1）. Thus, the Lyaponuv time or predictability time of the chaotic motion is obtained to be about 4.46 ± 0.5 years, which is slightly different with the predictability time obtained from Rz. However, they both indicate that solar activity forecast should be done only for a short to medium term due to the intrinsic complexity of the time behavior concerned.

关键词： Sun activity - Sun sunspot - chaos - Sun Wolf sunspot numbers

Diffusion Bonding of Al6061 and Cu by Hot Isostatic Pressing

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2020年第1期35卷 183-191页

作者：滕庆 li xiu WEI Qingsong State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074China

Diffusion bonding between Al and Cu was successfully performed by hot isostatic pressing(HIP). To improve the strength of diffusion bonding joint, pure nickel foils with different thickness were used as intermediate layer. Microstructure of the interface between Al and Cu was investigated by X-ray diffraction(XRD) technique, secondary electron microscopy(SEM), and nano-indentation tests. When the temperature was 500 ℃ and held for 3 h with a processing pressure of 50 MPa, Al and Cu could be bonded with its interface formed by several diffusion layers. With the addition of Ni interlayer, the diffusion of aluminum atoms was effectively hindered, and the interface became smoother. The tensile strength of bonded joints increases with increasing the thickness of Ni interlayer, which contributes to a reduction in the thickness of intermetallic compounds(IMCs) and well bonding quality of Al-Cu joints.

关键词： hot isostatic pressing diffusion bonding aluminum copper IMCs hardness

Synthesis and Anti-inflammatory Action of (η-C_5H_5)_2Ti(Sal)_2 and (η-C_5H_5)_2Ti(Clo)_2

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2006年第1期22卷 6-10页

作者： li xiu-juan ZENG Zheng-zhi College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 P. R. China

Two new complexes （Cp）2Ti （Sal）2 and（Cp）2Ti（Clo）2 （Cp=Cyclopentadienyl η^5-C5H5 ）, have been synthesized in anhydrous THF by the reaction of HSal（o-hydroxybenzoic acid, salicylate acid） or HClo[N-（ m-chloro-phenyl） anthranili acid, acidum clofenamicum] with （Cp）2TiCl2 and characterized by means of elemental analyses, IR, H NMR, ^13C NMR, UV and molar conductivity. In complex （Cp）2Ti（Sal）2 or（Cp）2Ti（Clo）2, the oxygen atom of the carboxyl group coordinates to Ti（Ⅳ） in a monodentate manner. The inhibitory action of the complexes on mouse ear tumefaction caused by croton oil and rat foot granulation growth caused by cotton balls is higher than that of the corresponding ligands HSal, HClo and [ （Cp）2TiCl2 ], whereas their toxicity is lower than those of the free ligands.

关键词： Salicylate acid N-(m-Chlorophenyl) anthranilic acid Cyclopentadienyltitanium complexes Anti-in-flammatory

New methods of controlled-source electromagnetic detection in China

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2020年第9期63卷 1268-1277页

作者： Qingyun DI Guoqiang XUE Changchun YIN xiu li Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Frontier Technology and Equipment Development Center for Deep Resources Exploration Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Geo-exploration Science and Technology Jilin UniversityChangchun 130026China School of Geology Engineering and Geomatics Chang’an UniversityXi’an 710054China

As an important branch of geophysical exploration method,the electromagnetic method with artificial source has advanced rapidly in the past *** methods are classified as airborne electromagnetic method,ground-air electromagnetic method,ground electromagnetic method,and marine electromagnetic *** the years,researchers in China have made significant improvement to the fundamental theory,forward modeling and inverse for series of electromagnetic detection ***,significant progress was made in the development of corresponding *** researched techniques and their developed equipment have been successfully utilized to detect underground targets as deep as 10 ***,there is increasing need for deep resources exploration,urban subsurface study,and prediction,monitoring and detection of geological *** meet the increasing need and catch up with the advanced international level of exploration technologies and developed equipment,there is urgent necessity and requirement to continue developing geophysical methods and the corresponding equipment.

关键词： Controlled-source Electromagnetic method Multiscale Deep earth detection

Probabilistic Teleportation of a Three-Particle GHZ State via Two Three-Particle Entangled W States

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2006年第6期45卷 1018-1022页

作者： liN xiu li Hong-Cai School of Physics and Optoelectronics Technology Fujian Normal University Fuzhou 350007 China

A scheme for teleporting an unknown three-particle GHZ state from a sender to either one of two receivers is proposed. In this scheme, the quantum channel is composed of two non-maximally three-particle entangled W states. An unknown three-particle GHZ state can be perfectly teleported probabilistically if the sender performs two generalized Bell-state measurements and the Hadamard operation while either one of two receivers introduces an ancillary particle which is one of the final three particle constituting the teleported state, then performs the controlled-not operation with the ancillary particle as the target bit and introduces an appropriate unitary transformation with the help of the other receiver＇s simple measurements. All kinds of unitary transformations are given in detail. The present scheme may be directly generalized to teleport an unknown multiparticle GHZ state via two three-particle entangled W states used as the quantum channel.

关键词： probabilistic teleportation three-particle entangled state partially three-particle entangled W state unitary transformation

The role of galectin-4 in physiology and diseases

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2016年第5期7卷 314-324页

作者： Zhan-Qi Cao xiu-li Guo Department of Pharmacology School of Pharmaceutical Sciences Shandong University Jinan 50012 China

Galectin-4, a tandem repeat member of the β-galactoside-binding proteins, possesses two carbohydraterecognition domains （CRD） in a single peptide chain. This lectin is mostly expressed in epithelial cells of the intestinal tract and secreted to the extracellular. The two domains have 40% similarity in amino acid sequence, but distinctly binding to various ligands. Just because the two domains bind to different ligands simultaneously, galectin-4 can be a crosslinker and crucial regulator in a large number of biological processes. Recent evidence shows that galectin-4 plays an important role in lipid raft stabilization, protein apical trafficking, cell adhesion, wound healing, intestinal inflammation, tumor progression, etc. This article reviews the physiological and pathological features of galectin-4 and its important role in such processes.

关键词： galectin-4 lipid raft crosslinker intestinalinflammation tumor progression