检索结果-南通市图书馆

Probing Nuclear Symmetry energy with Giant Dipole Resonances in Finite Nuclei

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

原子核物理评论 2009年第S1期26卷 181-184页

作者： CAO Li-gang1,3.MA Zhong-yu2.3 (1 {2. of Modern physics,{3. academy of Sciences,Lanzhou 73.000,China 2.China {2. of Atomic energy,beijing 102.13.China 3.Center of Theoretical Nuclear physics,National Laboratory of Heavy Ion Research Facility in Lanzhou,Lanzhou 73.000,China) institute of Modern physics Chinese Academy of SciencesLanzhou 730000China Center of Theoretical Nuclear physics National Laboratory of Heavy Ion Research Facility in LanzhouLanzhou 730000China China institute of Atomic energy Beijing 102413China Center of Theoretical Nuclear physics National Laboratory of Heavy Ion Research Facility in LanzhouLanzhou 730000China

The relationship between the centroid energies of the isovector giant dipole resonance of finite nuclei and the symmetry energy has been studied. It is found the excitation energies of the dipole resonance in finite nuclei are correlated linearly with the symmetry energy at and below the saturation density. This linear correlation leads to the symmetry energy at the saturation density at the interval 3..0 MeV ≤ S(ρ0) ≤ 3..0 MeV,and the symmetry energy at ρ = 0.1 fm-3.at the interval 2..2.2..5 MeV. It is proposed that a precise measurement of the dipole mode in nuclei could set up an important constraint on the equation of state for nuclear matter.

关键词： symmetry energy dipole resonance Pygmy resonance

Breeding maize of ideal plant architecture for high-density planting tolerance through modulating shade avoidance response and beyond

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2024年第5期66卷 849-864页

作者： Fereshteh Jafari Baobao Wang Haiyang Wang Junjie zou Biotechnology Research institute Chinese Academy of Agricultural SciencesBeijing 100081China Graduate School of chinese academy of Agricultural Sciences Beijing 100081China National Nanfan Research institute CAASSanya 572025China State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources College of Life SciencesSouth China AgriculturalUniversityGuangzhou 510642China

Maize is a major staple crop widely used as food,animal feed,and raw materials in industrial ***-density planting is a major factor contributing to the continuous increase of maize ***,high planting density usually triggers a shade avoidance response and causes increased plant height and ear height,resulting in lodging and yield *** plant height and ear height,more erect leaf angle,reduced tassel branch number,earlier flowering,and strong root system architecture are five key morphological traits required for maize adaption to high-density *** this review,we summarize recent advances in deciphering the genetic and molecular mechanisms of maize involved in response to high-density *** also discuss some strategies for breeding advanced maize cultivars with superior performance under high-density planting conditions.

关键词： flowering time high-density planting leaf angle maize plant architecture plant height/ear height root architecture tasselbranch

Validity of the Bouchet's complementary relationship at 102.observatories across China

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2009年第5期52卷 708-713页

作者： YU JingJie1,2.ZHANG YongQiang3.LIU ChangMing1,2.1 institute of Geographic Sciences and Natural Resources Research,{2. {2. of Sciences,{3. 100101,China 2.Key Laboratory of Water Cycle and Related Land Surface Processes,{2. {2. of Sciences,{3. 100101,China 3.CSIRO Land and Water,PO Box 1666,Canberra ACT 2.01,Australia institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China Key Laboratory of Water Cycle and Related Land Surface Processes Chinese Academy of Sciences Beijing China CSIRO Land and Water Canberra Australia

Bouchet in 1963.hypothesized that for large homogeneous land surface with minimum advection of heat and moisture,there exists a 1:1 complementary relationship of potential and actual evaporation coupled through land-atmosphere *** complementary relationship has been widely used to estimate regional actual evaporation and explain the pan evaporation *** examine the standardized potential evaporation(potential evaporation divided by wet environment evaporation) at 102.observatories at different elevations across ***,the relationship is appropriate at the low elevations(energy budget because of lower vapor pressure deficit and stronger global solar *** a result,at the {2. elevations(over 1000 m),the excess energy resulted by limited moisture availability is not enough to be converted into drying power of the *** result suggests that the complementary relationship is asymmetric at the {2. elevations.

关键词： evaporation complementary relationship elevation China

Surface effects of monolayer-protected gold nanoparticles on the redox reactions between ferricyanide and thiosulfate

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2005年第5期48卷 424-430页

作者： LI Di1, SUN Chunyan1, HUANG Yunjie1, LI Jinghong1,2.& CHEN Shaowei3.1. State Key Laboratory of Electroanalytical Chemistry, Changchun institute of Applied Chemistry, {2. {2. of Sciences, Changchun 13.02., China 2. Department of Chemistry, Tsinghua University, {3. 100084, China 3. Department of Chemistry, University of California, Santa Cruz, Santa Cruz, CA 95064, USA State Key Laboratory of Electroanalytical Chemistry Changchun institute of Applied Chemistry Chinese Academy of Sciences Changchun China Department of Chemistry Tsinghua University Beijing China Department of Chemistry University of California Santa Cruz Santa Cruz USA

Electron transfer through the self-assembled monolayers (SAMs) on gold nanopar-ticles is investigated by using the monolayer protected gold nanoclusters (MPCs) as elec-tron-transfer mediators. 3.Mercaptopropionic acid (MPA) and 11-meraptoundecanoic acid (MUA) MPCs were employed to catalyze the redox reaction between potassium ferricyanide and sodium thiosulfate. The catalytic mechanism was proposed that the MPCs act as diffusing elec-tron-mediators and electron transfers to and from the MPCs surface. Therefore the electron transfer rate through the capping layers would be proportional to the MPCs catalyzed reaction rate, which was monitored by the UV absorbance of ferricyanide. The calculated apparent rate constant was orders of magnitude smaller than that of the maximum of tunneling current, which was attributed to the splited energy level of the nanoscale particles.

关键词： electron transfer, three-dimensional self-assembled monolayers, redox reaction, electron transfer mediator, surface effect.

Study Pure Annihilation Decays Bs0（Bs0）→D~土π~干 in PQCD Approach

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical physics 2005年第10期44卷 659-664页

作者： LI Ying LU Cai--Dian institute of high {2. {3., the chinese academy of Sciences, beijing 100049, China institute of high {2. {3. the Chinese Academy of Sciences Beijing 100049 China

The rare decays Bs0→Dπ and Bs0→Dπ can occur only via annihilation-type diagrams in thestandard model. In this paper, we calculate branching ratios of these decays in perturbative QCD approach ignoringsoft final state interaction. From our calculation, we find that their branching ratios are at(10-6) with large CPasymmetry which may be measured in LHC-b experiment in the future.

关键词： PQCD annihilation decay B meson CP violation

Single crystal β-Ga_2._3. Cr grown by floating zone technique and its optical properties

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2007年第1期50卷 51-56页

作者： ZHANG JunGang1, 2. LI Bin3. XIA ChangTai1, XU Jun1, DENG Qun4, XU XiaoDong1, WU Feng1, XU WuSheng4, SHI HongSheng4, PEI GuangQing1, 2.& WU YongQing1,2.1 Shanghai institute of Optics and Fine Mechanics, {2. {2. of Sciences, Shanghai 2.1800, China 2.Graduate School of the {2. {2. of Sciences, beijing 10003., China 3.Shanghai institute of Applied physics, {2. {2. of Sciences, Shanghai 2.1800, China 4 GE (China) Research and Development Center Co. Ltd., Shanghai 2.12.3, China Shanghai institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai China Graduate School of the chinese academy of Sciences Beijing China Shanghai institute of Applied physics Chinese Academy of Sciences Shanghai China GE (China) Research and Development Center Co. Ltd. Shanghai China

β-Ga2.3: Cr single crystals were grown by floating zone technique. Absorption spectra and fluorescence spectra were measured at room temperature. The values of field splitting parameter Dq and Racah parameter B were obtained by the peak values of absorption spectra. The value 10Dq/B=2.1}14 manifests that in β-Ga2.3 crystals Cr3. ions are influenced by low energy crystal field. After {3. temperature annealing in air, the Cr3. intrinsic emission was enhanced and the green lumines-cence disappeared. The strong and broad 691 nm emission was obtained at 42. nm excitation due to the electron transition occurred from 4T2.to 4A2. The studies manifest that the β-Ga2.3 crystals have the potential application for tunable laser.

关键词： β-Ga2.3: Cr single crystals floating zone technique tunable laser spectrum.

Phase relationship of complex multi-component system in chromate cleaner production

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2007年第7期17卷 845-850页

作者： Ge Xinlei~1 Wang Xidong~(1,3.*) Zheng Shili~2.Zhang Mei~1 Zhang Yi~2.(1.Department of Physical Chemistry,University of Science and Technology beijing,beijing 100083.China 2.{2. of Process Engineering,{3. academy of Sciences,beijing 100080,China 3.College of Engineering,Peking University,beijing 100871,China) Department of Physical Chemistry University of Science and Technology Beijing Beijing 100083 China College of Engineering Peking University Beijing 100871 China institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China

The phase relationships of the complex multi-component systems in the liquid-phase oxidization and separation process related with the chromate cleaner production are investigated theoretically and *** phase diagram of main system Fe- Cr2.4-KOH-O2.f oxidization process and the relationship of its standard Gibbs free energy change with temperature are calculated.A se- ries of phase diagrams of the separation process at different temperatures,such as K（Na）OH-K（Na）2.rO4-H2.,KOH-KAlO2.H2., K（Na）OH-K（Na）2.O3.H2.,K（Na）OH-K（Na）HCO3.H2. and K（Na）HCO3.K（Na）2.rO4-H2. have also been *** ex- periments are carried out to verify the calculated *** results showed that the sub-molten salt media are suitable for the oxidization and separation processes;FeCr2.4can be oxidized across a wide range of temperature;K（Na）2.rO4can be separated from K（Na）AlO2.ystem at appropriate temperature and proper concentration;the crystallization of carbonate is easier than that of K（Na）2.rO4.

关键词： chromite chromate system thermodynamics calculation phase diagram

Propagation of interplanetary shock excited ultra low frequency (ULF) waves in magnetosphere-ionosphere-atmosphere——Multi-spacecraft “Cluster” and ground-based magnetometer observations

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2010年第9期53卷 2528-2534页

作者： WANG ChengRui1,2.ZONG QiuGang1,3.& WANG YongFu1 1 institute of Space {2. and Applied Technology,Peking University,{2. 100871,China 2.Sate Key Laboratory of Space Weather,{3. academy of Sciences,{2. 100190,China 3.Center for Atmospheric Research,600 Suffolk Street,University of Massachusetts Lowell,MA 01854,USA institute of Space physics and Applied Technology Peking University Beijing China Sate Key Laboratory of Space Weather Chinese Academy of Sciences Beijing China Center for Atmospheric Research University of Massachusetts Lowell USA

The ultra low frequency (ULF) wave in magnetosphere can act as an important means for solar wind energy inward *** paper quantitatively analyzes the propagation process of the ULF wave triggered by the interplanetary shock propagating from inner magnetosphere equatorial plane along magnetic field lines to the top of the ionosphere and below ionosphere propagating process and establishes a relatively complete magnetosphere-ionosphere-atmosphere propagation model which can be used to study the relationship between the amplitude of the ULF waves triggered by the interplanetary shock wave in magnetospheric space and the magnetic effect caused by the ULF *** a comparison with recent observations,we found that: in the event during November 7,2.04 that an interplanetary shock wave interacted with the magnetosphere,Cluster satellites observed that electric field fluctuations and the band-pass filtered result of ground stations meridional component had similar *** with the geomagnetic measurement near the footprints,we found that the electric field disturbance in the magnetosphere spread along the ground magnetic field lines in the form of the ULF waves and changed into geomagnetic *** result reveals that the ULF wave is in contact with the ground geomagnetic *** ULF waves couple with ionized components in ionosphere and spread to the ground in the form of electromagnetic *** this research,we believe that the magnetosphere,ionosphere and ground magnetic effects caused by interplanetary shock wave are the same physical phenomena responding in different *** on the overall consideration of entire electromagnetic response to the interplanetary shock wave,we found that the correlation between CLUSTER multi-satellite observation and geomagnetic station observation is due to the ULF wave propagated in magnetosphere-ionosphere-atmosphere system,and we quantitatively interpreted this response process

关键词： ultra low frequency (ULF) wave magnetic storm ionosphere IRI model interplanetary shock

SiO/CNTs:A new anode composition for lithium-ion battery

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2009年第12期52卷 2047-2050页

作者： REN YuRong1,2.3?,QU MeiZhen1 & YU ZuoLong1 1 Chengdu institute of Organic Chemistry,{2. {3. of Sciences,Chengdu 610041,China 2.College of Chemistry,Jilin Normal University,Siping 13.000,China 3.Graduate University of {2. {3. of Sciences,beijing 10003.,China Chengdu institute of Organic Chemistry Chinese Academy of Sciences Chengdu China College of Chemistry Jilin Normal University Siping China Graduate University of chinese academy of Sciences Beijing China

A new anode composition SiO/CNTs (carbon nanotubes) has been prepared by chemical vapor deposition (CVD) method. The results of scanning electron microscopy (SEM) confirm that CNTs deposit on small SiO particles,form a cage,and enwrap SiO particles tightly. SiO/CNTs anode composition exhibits an initial discharge and charge capacity of 1171 and 789 mAh/g,and maintains a reversible capacity of 500 mAh/g after 80 cycles. The improvement of the cyclic performance for SiO/CNTs composition is related to the maintaining of the electric network during cycling,which benefits from a tight contact between CNTs and SiO particles.

关键词： SiO/CNTs CVD composition anode Li-ion battery