检索结果-南通市图书馆

Pressure induced color change and evolution of metallic behavior in nitrogen-doped lutetium hydride

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2023年第8期66卷 125-130页

作者： Ying-Jie Zhang Xue ming Qing Li Xiyu Zhu Bo Zheng Yuecong Liu Chengping he Huan Yang hai-Hu Wen National Laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

By applying pressures up to 42 GPa on the nitrogen-doped lutetium hydride(LuH2_(±x)N_(y)),we have found a gradual change of color from dark-blue to pink-violet in the pressure region of about 12 to 21 *** temperature dependence of resistivity under pressures up to 50.5 GPa shows progressively optimized metallic behavior with ***,in the pressure region for the color change,a clear decrease of resistivity is observed with the increase of pressure,which is accompanied by a clear increase of the residual resistivity ratio(RRR).Fitting to the low temperature resistivity gives exponents of about 2,suggesting a Fermi-liquid behavior in the low temperature *** general behavior in a wide temperature region suggests that the electron-phonon scattering is still the dominant *** magnetoresistance up to 9 T in the state under a pressure of 50.5 GPa shows an almost negligible effect,which suggests that the electric conduction in the pink-violet state is dominated by a single *** is highly desired to have theoretical efforts in understanding the evolution of color and resistivity in this interesting system.

关键词： nitrogen-doped lutetium hydride room temperature superconductivity high-pressure technique color change

Resistance fluctuations in superconducting K_(x)Fe_(2-y)Se_(2) single crystals studied by low-frequency noise spectroscopy

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第4期30卷 502-507页

作者： hai Zi Yuan Yao ming-Chong he Di Ke Hong-Xing Zhan Yu-Qing Zhao hai-Hu Wen Cong Re Physics Department School of Physics and AstronomyYunnan UniversityKunming 50500China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of ScienceBeijing 100190China Physics Department Nanjing UniversityNanjing 210093China

Low-frequency resistance noise spectroscopy is applied to investigate bulk single crystals of the intercalated ironselenide K_(x)Fe_(2-y)Se_(2) superconductors with different iron vacancy *** on a generalized fluctuation model,the well-observed resistance hump above 100 K is interpreted as an insulator-metal phase transition with a characteristic transition energy of 0.1-0.6 eV,indicating a highly inhomogeneous energy distribution *** the superconducting transition regime,we find that the normalized resistance noise scales with resistance R excellently as S_(R)/R^(2)∝R^(l_(rs)) with the noise exponent lrs≈*** reduced iron vacancy disordering in enhanced superconductivity K_(x)Fe_(2-y)Se_(2) crystals,the level of resistance fluctuations is greatly suppressed,suggesting a geometrical phase transition for conduction channel,which is directly related to the microstructure of the crystals.

关键词： K_(x)Fe_(2-y)Se_(2) phase separation noise and chaos percolation

Proposal of Realization Restricted Quantum Game with Linear Optic Method

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2006年第1期45卷 75-78页

作者： ZHAO hai-Jun PANG Xi-ming Department of Physics Hunan Normal University Changsha 410081 China

We present a quantum game with the restricted strategic space and its realization with linear optical system, which can be played by two players who are separated remotely. This game can also be realized on any other quantum computers. We find that the constraint brings some interesting properties that are useful for making game models.

关键词： quantum game restriction equilibrium linear optic

Source and accumulation process of Jurassic biodegraded oil in the Eastern Junggar Basin,NW China

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2021年第4期18卷 1033-1046页

作者： Mao-Guo Hou ming Zha Xiu-Jian Ding he Yin Bao-Li Bian hai-Lei Liu Zhong-Fa Jiang School of Geosciences China University of PetroleumQingdaoShandong 266580China Research Institute of Exploration and Development Xinjiang Petroleum Administration BureauKaramay 834000China

Biodegradation usually obscures or even radically alters the original characteristics of oil *** mixing of oil from multiple sources makes each source difficult to *** the source of biodegraded oil from multiple sources has always been a hard nut to *** to this challenge,in this study-we carried out a comprehensive investigation of biodegradation impacts,oil-source correlation,and oil charging history to trace the source and reveal the mixing process of biodegraded oil in the Toutunhe Formation(J_(2)t)in the eastern Junggar Basin,NW *** oil of this area was biodegraded to different extent,consequently,many commonly used biomarker parameters(***/Ph,Pr/n C_(17))became less powerful for oil-source *** address this problem,the resistance of many biomarkers to biodegradation was analyzed,and those of high bio resistance were selected to generate a more reliable oil-source *** results revealed that biodegraded oil was a mixture of oil sourced from Lucaogou Formation(P_(2)l)and Xiaoquangou Formation(T_(2-3)xq).Core sample observation,microscopic fluorescent analysis and fluid inclusion analysis were combined to analyze comprehensively oil charging *** analysis of accumulation process exhibited that the existing oil in J_(2)t was a mixture originated from the P_(2)l and T_(2-3)xq source rocks in two separate charging stages when it underwent a complicated process of charging,biodegradation,recharging and mixing.

关键词： Biodegraded oil Mixed oil Oil-source correlation Oil accumulation process Junggar Basin

An investigation into the deformation, movement and coalescence characteristics of water-in-oil droplets in an AC electric field

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2013年第4期10卷 548-561页

作者： he Li-min Yang Dong-hai Gong Rong-na Ye Tuan-jie Lü Yu-ling Luo Xiao-ming College of Pipeline and Civil Engineering China University of Petroleum Beijing Petrochemical Engineering Co. Ltd. Petro China Oil & Gas Pipeline Control Center

Drop-drop coalescence is important in electric dehydrators used for oil-water separation in the oil *** deformation degree,angle between the electric field and the center line of two drops,effects of intensities and frequencies of the electric field have been studied by analyzing droplet ***,seldom have people investigated the movement and the relative velocity in the process of dropdrop *** this paper forces acting on a single droplet and horizontal water droplets in an AC electric field were analyzed,and experiments were carried out to investigate the deformation,movement and coalescence characteristics of droplets with white oil and *** a micro high-speed camera system and image processing technology,the droplet images were collected and *** results indicate that the deformation is mainly affected by the electric field intensity,frequency,droplet diameter and the oil *** field strength and large diameter facilitate deformation of drops in the electric *** effect of frequency and oil viscosity is not *** frequency and higher oil viscosity will lead to smaller oscillation *** effect of electric field intensity and droplet diameter on oscillation amplitude is not *** the center-to-center distance between droplets is large,the forces acting on droplets in the horizontal direction are mainly dipole-dipole attraction and drag *** is also the film-thinning force when droplets get *** forces are simplified and *** on force analysis and Newton＇s second law,the relative movement is analyzed in different parts,and the relationship of center-to-center distance and time is in accordance with an explinear function at different *** to experimental data,the movement of 145 μm double droplets before coalescence can be fitted well with an explinear function at two *** addition,the whole movement process is investigated and can be estimated with

关键词： Deformation coalescence velocity AC electric field

Clonal Plasticity in Response to Reciprocal Patchiness of Light and Nutrients in the Stoloniferous herb Glechoma Iongituba L.

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2006年第4期48卷 400-408页

作者： Yu Chu Fei-hai Yu ming Dong Laboratory of Quantitative Vegetation Ecology Institute of Botany the Chinese Academy of Sciences Beijing 100093 China

Interconnected ramets of clonal plants can functionally specialize in the uptake of resources from aboveground and/or underground sources. Ramet pairs of the clonal stoloniferous herb Glechoma Iongltuba L. were grown In spatially heterogeneous environments with complementary availability of light and nutrients. Plasticity with respect to root-shoot ratio, fitness-related traits （biomass, number of ramets and dry weight per ramet）, morphological traits （lamina area, root length） were experimentally examined. The aim was to understand the adaptation of G. Iongltuba to an environment with reciprocal patchiness of light and soil nutrients by plasticity In Its root-shoot ratio and clonal morphology. The results showed that the performance of ramets growing In patches with high light Intensity and low soil nutrients into the adjacent opposite patches was Increased in terms of fitness-related traits. However, the performance of those from patches with low light Intensity and high soil nutrients into the adjacent opposite patches was not changed. The root-shoot ratio and clonal morphology were plastic. Morphological traits such as lamina area and root length were altered In a way that enhanced the capture of light resources and soil nutrients. Apparent reciprocal resource transport between the ramets In an environment of reciprocal patchiness of resources can enhance the growth of ramets with complementary resource deficiencies.

关键词： clonal plant clonal plasticity complementary patchiness functional specialization light soil nutrients.

DELAYED FLOWERING, an Arabidopsis Gene That Acts in the Autonomous Flowering Promotion Pathway and Is Required for Normal Development

维普期刊数据库评论

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 Integrative Plant Biology 2006年第1期48卷 27-34页

作者： ming-Jie Chen Zheng Yuan hai Huang Key Laboratory of Molecular Genetics Shanghai Institute of Plant Physiology and Ecology Graduate School of the Chinese Academy of Sciences Shanghai 200032 China

The control of flowering time in higher plants is one of the most important physiological processes and is critical for their reproductive success. To investigate the mechanisms controlling flowering time, we screened for Arabidopsis mutants with late-flowering phenotypes. One mutant, designated delayed flowering （dfr） in the Landsberg erecta （Ler） ecotype, was identified with delayed flowering time. Genetic analysis revealed that dfr is a single gene recessive nuclear mutant and the mutation was mapped to a locus tightly linked to UFO on chromosome 1. To our knowledge, no gene regulating flowering time has been reported yet in this region. The dfrmutant plant showed a delayed flowering time under the different growth conditions examined, including long- and short-day photoperiods and gibberellic acid GA3 treatments, suggesting that DFR is a gene involved in the autonomous flowering promotion pathway. The Arabidopsis gene FLOWERING LOCUS C （FLC） plays a central role in repressing flowering and its transcripts are undetectable in wild-type Ler. However, FLCexpression was upregulated in the dfrmutant, suggesting that DFR is a negative regulator of FLC. In addition, the dfr mutant plant displayed altered valve shapes of the silique and the number of trichomes and branches of each trichome were both reduced, indicating that the DRFgene is also required for normal plant development. Moreover, dfr leafy-5 （Ify-5） double mutant plants showed a much later flowering time than either dfr or Ify-5 single mutants, indicating that DFR and LFY act synergistically to promote flowering in Arabidopsis.

关键词： Arabidopsis autonomous pathway dfr, flowering time trichome.

Magnetic field changes associated with three successive M-class solar flares on 2002 July 26

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2011年第6期11卷 692-700页

作者： Pu Wang ming-De Ding hai-Sheng Ji hai-Min Wang epartment of Astronomy Nanjing UniversityNanjing 210093China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210008China Space Weather Research Lab Center for Solar Terrestrial ResearchNew Jersey Institute of TechnologyNewarkNJ 07102US

With an extensive analysis,we study the temporal evolution of magnetic flux during three successive M-class flares in two adjacent active regions：NOAA 10039 and *** primary data are full disk longitudinal magnetograms observed by SOHO/*** three flares are observed to be accompanied by magnetic flux *** changes occurred immediately or within 1 ～ 10 minutes after the starting time of the flares,indicating that the changes are obvious consequences of the solar *** changes in many points are intrinsic in magnetic flux,for some sites,it is caused by a rapid expansion motion of magnetic *** the second flare,the associated change is more gradual compared with the ＇step-function＇ reported in ***,we use the data observed by the Imaging Vector Magnetograph（IVM） at Mees Solar Observatory to check possible line profile changes during the *** results from the IVM data confirm the flux changes obtained from the MDI data.A series of line profiles were obtained from the IVM＇s observations and analyzed for flux change *** find that the fluctuations in the width,depth and central wavelength of the lines are less than 5.0 even at the flare＇s *** line profile change is observed during or after the *** conclude that the magnetic field changes associated with the three solar flares are not caused by flare emission.

关键词： Sun:activity-Sun:magnetic field-Sun:flares

Dual-wavelength dual-indicator catalytic kinetic spectrophotometry for determination of trace Ru(Ⅲ)

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2013年第6期32卷 605-608页

作者： hai-Yan Chen Yu-Jing Chen ming Zhang School of Chemistry and Chemical Engineering Yangzhou University Department of Chemical Engineering Yangzhou Polytechnic InstituteYangzhou 225127 China School of Chemistry and Materials Science Ludong University

A new dual-wavelength dual-indicator catalytic kinetic spectrophotometric method for the determination of trace Ru(III)was *** method was based on Ru(III)-catalyzing oxidation of Arsenazo I and indigo carmine by potassium bromate in sulfuric *** absorbances of the catalytic and noncatalytic systems were measured at 510 and610 nm,*** the optimum conditions,the linear range of determination is 0–0.12 lgáml-1and the detection limit is 1.21 9 10-4lgá*** method was applied for the determination of trace Ru(III)in ore samples with satisfactory results.

关键词： Dual-wavelength Catalytic spectrophotometry Ru(III) Arsenazo I Indigo carmine