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A key factor to the spin parameter of uniformly rotating compact stars: crust structure

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Research in Astronomy and Astrophysics 2016年第4期16卷 63-70页

作者： Bin Qi Nai-Bo Zhang Bao-yuan Sun shou-Yu Wang Jian-Hua Gao Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment Institute of Space Sciences Shandong University School of Nuclear Science and Technology Lanzhou University Key Laboratory of Special Function Materials and Structure Design Ministry of Education

We study the dimensionless spin parameter j ≡ cJ/（GM2） of different kinds of uniformly rotating compact stars, including traditional neutron stars, hyperonic neutron stars and hybrid stars, based on relativistic mean field theory and the MIT bag model. It is found that j ~ 0.7, which had been suggested in traditional neutron stars, is sustained for hyperonic neutron stars and hybrid stars with M 〉 0.5 MG. Not the interior but rather the crust structure of the stars is a key factor to determine jmax for three kinds of selected compact stars. Furthermore, a universal formula j = 0.63（f/fK） -- 0.42（f/fK）2 ＋ 0.48（f/fK）z is suggested to determine the spin parameter at any rotational frequency f smaller than the Keplerian frequency fK.

关键词： stars: neutron -- stars: rotation -- spin parameter-- equation of state -- methods: numerical

Grain yield and grain moisture associations with leaf, stem and root characteristics in maize

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Journal of Integrative Agriculture 2022年第7期21卷 1941-1951页

作者： XU Chen-chen ZHANG Ping WANG yuan-yuan LUO Ning TIAN Bei-jing LIU Xi-wei WANG Pu HUANG shou-bing College of Agronomy and Biotechnology China Agricultural UniversityBeijing 100193P.R.China

Improving grain yield(GY)and reducing grain moisture(GM)are urgent demands for directly harvesting kernels with combine harvesters in maize *** and GM are both related to leaf,stem and root characteristics,but the relationships are not fully *** better understand these relationships,we conducted a field trial involving 12 maize hybrids with two sowing dates in 2017 and 10 maize hybrids with one sowing date in *** ranged from 6.5–14.6 t ha^(–1) in early-sown varieties and 9.3–12.7 t ha^(–1) in late-sown varieties in 2017,and 5.9–7.4 t ha^(–1) in 2019,respectively,with corresponding GM variations of 29.8–34.9%,29.4–34.5%and 31.9–37.1%at harvest.A large maximum leaf area contributed to a high yield,a fast leaf senescence rate accelerated grain dehydration in the late growth period,and a compact root structure resulted in both of high-yield and fast-grain dehydration.A strong stem improved lodging resistance but maintained a high GM at harvest,and it is challenging to combine high GY and low GM in *** GY co-existed with low GM in some varieties that should have a rapid grain filling,a relatively long grain-filling duration,and a rapid grain dehydration in the late growth period.A high daily temperature in the late growth period also improved GY and reduced GM by influencing grain filling and dehydration,suggesting that adjusting the sowing date should be an alternative strategy to combine high GY and low GM in kernel harvesting.

关键词： maize grain yield grain moisture stem strength

Magnetic and Transport Properties of Bi_(0.5)Ca_(0.5–x)La_xFe_(0.3)Mn_(0.7)O_3(x=0, 0.05, 0.10, 0.15, 0.20, 0.25) Prepared by Molten Salt Method

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Chemical Research in Chinese Universities 2011年第1期27卷 15-18页

作者： DONG Zhong-ping HU Bin CHEN Yan yuan Hong-ming FENG shou-hua State Key Laboratory of Inorganic Synthesis ＆ Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China

Polycrystallines Bi0.5Ca0.5-xLaxFe0.3Mn0.7O3（x=0, 0,05, 0.10, 0.15, 0.20, 0.25） were prepared by molten salt method and showed perovskite orthorhombic structure with space group Pnma. The magnetic measurements indicate that the compounds exhibit antiferromagnetic behavior in a temperature range of 4-300 K. The measurements of transport properties suggest that the substitution of La for Ca enhanced the conductivity, and a kink appeared on the curve of temperature dependence of resistivity at 275 K, which is related to the spin-reorientation in the samples.

关键词： Perovskite Doping Magnetism Spin-reorientation

N-Soliton Solutions for the Four-Potential Isopectral Ablowitz–Ladik Equation

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Chinese Physics Letters 2011年第6期28卷 5-8页

作者： CHEN shou-Ting ZHU Xiao-Ming LI Qi CHEN Deng-yuan Department of Mathematics Shanghai UniversityShanghai 200444 College of Mathematics and Information Science East China Institute of TechnologyJiangxi 310018

The bilinear form of the four-potential isospectral Ablowitz–Ladik(AL)equation is derived by the dependent variable *** N-soliton solutions of the equation are obtained through the Hirota ***,the double Casoratian so... 详细信息

关键词： technique method equation

Investigation of Aegilops umbellulata for stripe rust resistance,heading date,and the contents of iron,zinc,and gluten protein

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Journal of Integrative Agriculture 2023年第4期22卷 1258-1265页

作者： SONG Zhong-ping ZUO yuan-yuan XIANG Qin LI Wen-jia LI Jian LIU Gang DAI shou-fen YAN Ze-hong State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China Chengdu 611130P.R.China Triticeae Research Institute Sichuan Agricultural UniversityChengdu 611130P.R.China

Aegilops umbellulata(UU)is a wheat wild relative that has potential use in the genetic improvement of *** this study,46 *** accessions were investigated for stripe rust resistance,heading date(HD),and the contents of iron(Fe),zinc(Zn),and seed gluten ***-two of the accessions were classified as resistant to stripe rust,while the other four accessions were classified as susceptible to stripe rust in four *** average HD of *** was significantly longer than that of three common wheat cultivars(180.9 d vs.137.0 d),with the exception of PI226500(138.9 d).The *** accessions also showed high variability in Fe(69.74-348.09 mg kg^(-1))and Zn(49.83-101.65 mg kg^(-1))*** accessions(viz.,PI542362,PI542363,and PI554399)showed relatively higher Fe(230.96-348.09 mg kg^(-1))and Zn(92.46-101.65 mg kg^(-1))contents than the *** Fe content of *** was similar to those of *** and *** but higher than those of *** and common *** umbellulata showed a higher Zn content than ***,***,and common wheat,but a lower content than ***,*** had the highest proportion of γ-gliadin among all the species investigated(*** *** species=mean 72.11%vs.49.37%;range:55.33-86.99%vs.29.60-67.91%).These results demonstrated that *** exhibits great diversity in the investigated traits,so it can provide a potential gene pool for the genetic improvement of these traits in wheat.

关键词： Aegilops umbellulata stripe rust resistance heading date Fe and Zn gluten proteins genetic variation

Room Temperature Modulated Structure of Ca and K co-Doped LaMnO_3

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Chemical Research in Chinese Universities 2012年第5期28卷 784-787页

作者： HOU Chang-min HUANG Ke-ke HU Bin yuan Hong-ming FENG shou-hua State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangehun 130012R R.China

A series of perovskite compounds of La1-x-yCaxKyMnO3 was prepared by hydrothermal disproportionation reaction of MnO2. The three oxidation states of manganese（Mn3＋, Mn4＋ and Mn5＋） can stably exist in the compounds. Under room temperature conditions, twice and three times modulated structure produced by the charge ordering can be observed by X-ray diffraction（XRD）, select area electron diffraction（SAED） and high resolution transmission electron microscopy（HR-TEM）. The splits of the diffraction peaks of the single crystals confirmed by synchrotron X-ray diffraction experiment are in accordance with those of the powder sample. The existence of the different oxidation states of Mn3＋, Mn4＋ and Mn5＋ can be considered to be the dominating reason of the complicated room temperature modulated structure.

关键词： Modulated structure Mixed valence state Room temperature

Comparison of two thioxopeptide bond photoswitches in insect kinin

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Chinese Chemical Letters 2010年第4期21卷 476-479页

作者： Cong, Zhi yuan Yang, Long Fei Jiang, Ling Ye, Dan Dong, shou Liang Lanzhou Univ Inst Biochem & Mol Biol Sch Life Sci Lanzhou 730000 Peoples R China

The photoisomerization abilities of secondary thioxopeptide bond(CS-NH) and thioxo prolyl bond(CS-N) incorporated into the C-terminal pentapeptide of insect kinin were compared.H-Phe-Phe-Ψ[CS-NH]-D-Ala-Trp-Gly-NH_2 and H-Phe-Tyr-Ψ[CS-N]- Pro-Trp-Gly-NH_2 were studied by UV-vis *** isomerization energy barriers of the two segments,Ac-Phe-Ψ[CS-NH]- D-Ala-NH_2 and Ac-Tyr-Ψ[CS-N]-Pro-NH_2 picked from the two peptides,were calculated using ab initio *** cis isomer of CS-N is more stable than th...

关键词： Photoswitch Thioxopeptide bond Energy barrier

CRYSTALLINE MORPHOLOGY IN A SERIES OF CH_(3)-SUBSTITUTED THERMOTROPIC AROMATIC POLYESTERS WITH EVEN AND ODD FLEXIBLE SPACERS

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Chinese Journal of Polymer Science 2001年第1期19卷 71-78页

作者： shou-xi Chen Zhong-ming Hu Wen-hui Song Yong-ze Jin Ren-yuan Qian State Key Laboratory of Polymer Physics and Chemistry Center for Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing 100080China

Crystalline morphology in a series of CH_(3)-substituted main chain thermotropic aromatic polyesters with even and odd numbered methylene spacers has been studied by polarizing optical microscopy(POM),scanning electron microscopy(SEM)and transmission electron microscopy(TEM).On crystallization from solution evaporation spherulites of radial structure were observed in the polymers with even numbered spacers,but spherulites with concentric rings form in the polymer with odd numbered *** spherulites have a lamellar structure,which is about 10 nm in *** crystallization from nematic glassy state spherulites can not be grown;lamellar structure was only observed around disclinations in a specimen during *** the case of crystallization from nematic melt two types of spherulites can be observed far the sample with even numbered *** the sample with add numbered spacers spherulites can not be formed,but only irregular crystallites.

关键词： crystalline morphology spherulite even-odd flexible spacers CH_(3)-substituted thermotropic aromatic polyester

Influence of pump noise on the health of fish in a large pumping station

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Journal of Hydrodynamics 2022年第3期34卷 522-531页

作者： Fan Zhang Lu-feng Zhu Xiao-tao Shi Ke Chen Desmond Appiah shou-qi yuan Jin-feng Zhang National Research Center of Pumps Jiangsu UniversityZhenjiang212013China Hubei International Science and Technology Cooperation Base of Fish Passage China Three Gorges UniversityYichang443002China

The axial flow pump,characteristic of a large flow,is widely used in pumping stations of hydraulic ***,the internal noise of the axial-flow pump of a high sound pressure level is notable,with a great influence on the fishing *** present,the studies of the impact of the noise on fish are mainly focused on the explosion,the offshore wind power plant,the ship and other fields,with little attention on the noise generated by the pumping *** paper applies the combination of the computational fluid dynamics and the Actran to study the sound pressure level distribution in the high-noise area inside the axial-flow pump and the noise distribution in the downstream areas of the pumping *** comparisons are made of the hearing threshold and the hearing damage threshold of fish,and it is revealed that the noise inside the axial-flow pump exceeds the hearing damage threshold of fish,which could lead to the hearing damage of over-pumped ***,the noises emitted from the pumping station to the downstream are beyond the fish hearing threshold and will also have a significant impact on the fish around the pumping *** study can provide a reference for studying the impact of the noise generated by various large-scale water transfer projects on fish.

关键词： Fish numerical analysis axial flow pump ACTRAN hearing impairment