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On Weakly s-Semipermutable Subgroups of Finite Groups

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Algebra Colloquium 2014年第4期21卷 541-550页

作者： na tang Xianhua Li School of Mathematics Science Soochow University Suzhou Jiangsu 215006 China

We prove that a finite group G is p-supersolvable or p-nilpotent if some sub- groups of G are weakly s-semipermutable in G. Several earlier results are generalized.

关键词： weakly s-semipermutable subgroup p-nilpotent group p-supersolvable group

Numerical simulation and experimental study on dissolving characteristics of layered salt rocks

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Chinese Journal of Chemical Engineering 2019年第5期27卷 1030-1036页

作者： Qiqi Wanyan Yiming Xiao na tang China University of Petroleum-Beijing Beijing J02249China College of Chemical Engineering and Material Science Tianjin University of Science and TechnologyTianjin 300457China Tianjin Key Laboratory of Marine Resources and Chemistry Tianjin 300457China

Underground salt cavern reservoirs are ideal spaces for energy storage. China is rich in salt rock resources with layered lacustrine sedimentary structures. However, the dissolution mechanism of layered salt rocks remains poorly understood, resulting in significant differences between the actual measurements and the designed indices for the layered salt rock water-soluble cavity-making cycle and the cavity shape. In this work, the dissolution rates of 600 groups of layered salt rocks in China under different conditions were determined ***, the established artificial neural network prediction model was used to assess the effects of the contents of naCl, na2 SO4, and CaSO4 in the salt rocks, concentrations, dissolution angles, and flow rates on their dissolution rates by performing ANOVA and F-test. The results provide a theoretical basis for evaluating the dissolution rate of layered salt rocks under different conditions and for the numerical simulation of the layered salt rock water-soluble cavity-making process.

关键词： Salt cavern reservoirs Layered salt rock Dissolution rate ANOVA

Dynamical fluctuations in fragmentation reactions in a Boltzmann-Langevin approach

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Communications in Theoretical Physics 2022年第11期74卷 140-150页

作者： Bing Li na tang Feng-Shou Zhang Key Laboratory of Beam Technology of the Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Institute of Radiation Technology Beijing Academy of Science and TechnologyBeijing 100875China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of LanzhouLanzhou 730000China

Based on the isospin-dependent Boltzmann-Langevin model,the dynamical fluctuations in the fragmentation reaction of^(112)Sn+^(112)Sn are *** quadrupole moment and octupole moment with zero magnetic quantum number have large fluctuations in the early time of the *** dynamical fluctuations in momentum space show a strong dependence on the incident *** effects of using different fluctuations on the fragment cross sections are also studied in the fragmentation *** results by using Q_(20)+Q_(30)fluctuation have a better agreement with the experimental *** using Q_(20)+Q_(30)fluctuation produce more proton-rich and neutron-rich nuclei than those using Q_(20)fluctuation ***,the difference between the production cross sections of fragments calculated by using Q_(20)and Q_(20)+Q_(30)fluctuations is larger in the vicinity of the *** results present that the dynamical fluctuations may affect the whole dynamical process of fragmentation reactions including the production of fragments,due to the nonlinear nature of the Boltzmann-Langevin equation.

关键词： fragmentation reactions the isospin-dependent Boltzmann-Langevin model dynamical fluctuations

Isospin effects of projectile fragmentation in a Boltzmann-Langevin approach

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Chinese Physics C 2021年第8期45卷 90-98页

作者： BingLi na tang Feng-ShouZhang The Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Beijing Radiation Center Beijing 100875China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of LanzhouLanzhou 730000China

The isospin effects of projectile fragmentation at intermediate energies are investigated using an isospin-dependent Boltzmann-Langevin *** collisions of mass-symmetric reactions including 58Fe,58Ni+58Fe,and Ni at intermediate energies,in the 30 to 100 MeV/A range,are studied for different symmetry *** ratios of the isotopic,isobaric,and isotonic pairs of fragments from the intermediate-mass region using three symmetry energies are extracted as functions of the N/Z ratio of the composite systems in the entrance channel and the incident *** is found that the yield ratios are sensitive to symmetry energies,especially for neutron-rich systems,and the calculations using soft symmetry energy are closer to the experimental *** isospin effect is stronger for the soft symmetry energy,owing to the competition of the repulsive Coulomb force and the symmetry energy attractive force on the *** the first time,the splits are presented,revealing a transition from the isospin equilibrium at lower energies to translucency at intermediate *** results show a degree of transparency in that intermediate mass fragments undergo a transition from dependence on the composite systems in the entrance channel to reliance on the projectile and target nuclei.

关键词： symmetry energy projectile fragmentation isospin-dependent Boltzmann-Langevin model isospin effect

Production of p-rich nuclei with Z = 20-25 based on radioactive ion beams

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Nuclear Science and Techniques 2022年第5期33卷 30-38页

作者： Bing Li na tang Yu-Hai Zhang Feng-Shou Zhang Key Laboratory of Beam Technology of the Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Institute of Radiation Technology Beijing Academy of Science and TechnologyBeijing 100875China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of LanzhouLanzhou 730000China

Within the framework of isospin-dependent Boltzmann-Langevin model,the production cross sections of proton-rich nuclei with Z=20-25 are *** to the reaction results for different isospin of projectiles^(48)Ni,^(49)Ni,and^(50)Ni,proton-rich fragments tend to be more easily produced in reactions with the protonrich projectile^(48)*** production cross sections of the unknown nuclei in the vicinity of the projectile are sensitive to incident *** is observed that incident energy of 345 MeV/u is appropriate for producing proton-rich nuclei with Z=*** projectile fragmentation reactions based on the radioactive ion beam of48Ni at 345MeV/u,several unknown proton-rich nuclei near the proton drip line are generated in the *** these new nuclei are near-projectile elements near Z=*** production cross sections of the new nuclei^(34)Ca,37,38Sc,^(38)Ti,^(40,41,42)V,^(40,41)Cr,and^(42,43,44,45)Mn are in the range of ***,projectile fragmentation of radioactive ion beams of Ni is a potential method for generating new proton-rich nuclei with Z=20-25.

关键词： Production cross sections Radioactive ion beams Isospin-dependent Boltzmann-Langevin model

Refill Friction Stir Spot Welding of Similar and Dissimilar Alloys:A Review

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Acta Metallurgica Sinica(English Letters) 2020年第1期33卷 30-42页

作者： Xiao-Song Feng Song-Bin Li Li-na tang Hui-Min Wang Shanghai Aerospace Equipments Manufacturer Co. LtdShanghai 200245China national Center for Materials Service Safety University of Science and TechnologyBeijingBeijing 100083China

Refi ll friction stir spot welding,also known as friction spot welding(FSpW),is a solid-state welding process suitable for spot joining of lightweight *** the eff orts of improving joint quality for similar and dissimilar materials,for example,aluminum and magnesium,this joining technology is well *** joining mechanism and process characteristics of FSpW have been widely ***,the application of FSpW in industry has not been entirely *** this review article,the research of similar and dissimilar material joints,such as,Al/Cu,Al/Ti,Al/Mg and Al/Steel,is *** microstructural features and mechanical properties of the joints,welding tool and the application development are discussed in detail.

关键词： Refill friction stir spot welding Dissimilar joints Microstructure Mechanical properties Welding parameters

The Effects of Dwarfing Genes (Rht-B1b, Rht-D1b, and Rht8) with Different Sensitivity to GA_3 on the Coleoptile Length and Plant Height of Wheat

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Agricultural Sciences in China 2009年第9期8卷 1028-1038页

作者： tang na JIANG Ying HE Bei-ru HU Yin-gang College of Agronomy Northwest A＆F University Yangling 712100 P.R. China Yangling Branch of China national Wheat Improvement Centre Yangling 712100 P.R.China Shaanxi Key Laboratory of Molecular Biology for Agriculture Yangling 712100 P.R. China

Understanding the effects of wheat dwarfing genes on the coleoptile length and plant height is crucial for the proper utilization of dwarfing genes in the improvement of wheat yield. Molecular marker analysis combined with pedigree information were used to classify wheat cultivars widely planted in major wheat growing regions in China into different categories based on the dwarfing genes they carried. The effects of the dwarfing genes with different sensitivity to gibberellins （GA3） on the coleoptile length and plant height were analyzed. Screening of 129 cultivars by molecular marker analysis revealed that 58 genotypes of wheat contained the dwarfing gene Rht-B1b, 24 genotypes of wheat contained Rht-D1b gene and 73 genotypes of wheat possessed Rht8 gene. In addition, among these 129 cultivars, 35 genotypes of wheat cultivars contained both Rht-B1b and Rht8 genes and 16 genotypes of wheat cultivars contained both Rht-D1b and Rht8 genes. Wheat cultivars with the dwarfing genes Rht-B1b or Rht-D1b were insensitive to GA3, while the cultivars with the dwarfing gene Rht8 were sensitive to GA3. Most of the wheat genotypes containing combination of Rht8 gene with either Rht-B1b or Rht-D1b gene were insensitive to GA3. The plant height was reduced by 24.6, 30.4, 28.2, and 32.2%, respectively, for the wheat cultivars containing Rht-B1b, Rht-D1b, Rht-B1b ＋ Rht8, and Rht-D1b ＋ Rht8 genes. The plant height was reduced by 14.3% for the wheat cultivar containing GA3-sensitive gene Rht8. The coleoptile length was shortened by 25.4, 31.3, 28.4 and 31.3%, respectively, in the wheat cultivars containing Rht-B1b, Rht-D1b, Rht-B1b ＋Rht8 and Rht-D1b ＋ Rht8 genes, while the coleoptile length was shortened only by 6.2% for the wheat cultivar containing Rht8 gene. We conclude that GA3-insensitive dwarfing genes （Rht-B1b and Rht-D1b） are not suitable for the wheat improvement in dryland because these two genes have effect on reducing both plant height and coleoptile length. In contrast, GA3

关键词： bread wheat dwarfing genes Rht-B1b Rht-D1b Rht8 coleoptile length plant height

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旱碱胁迫对小麦产量和籽粒品质的影响

核农学报 2025年第2期39卷 351-359页

作者：李梦成李明郭波莉赵海燕唐娜许锐王伟伟青岛农业大学食品科学与工程学院山东青岛266109 中国农业科学院农产品加工与营养健康研究院(沧州) 河北沧州061001 中国农业科学院农产品加工研究所/农业农村部农产品加工重点实验室北京100193 沧州市农林科学院河北沧州061001

为研究旱碱胁迫对小麦产量和品质的影响,本研究对比了种植于旱碱地及非旱碱地7个小麦品种的产量、千粒重、容重、出粉率、蛋白质含量、湿面筋含量、粉质参数等指标。结果表明,受旱碱的影响,品种平均产量、千粒重、容重和弱化度分别下降... 详细信息

为研究旱碱胁迫对小麦产量和品质的影响,本研究对比了种植于旱碱地及非旱碱地7个小麦品种的产量、千粒重、容重、出粉率、蛋白质含量、湿面筋含量、粉质参数等指标。结果表明,受旱碱的影响,品种平均产量、千粒重、容重和弱化度分别下降了27.32%、9.21%、2.82%和38.27%,平均干面筋含量,面团的形成时间、稳定时间和粉质质量分别提高了9.21%、48.39%、479.31%和68.00%;平均出粉率和吸水率分别下降了4.89、2.02个百分点,平均蛋白质和湿面筋含量分别提高了2.30、2.64个百分点。上述结果表明,旱碱胁迫会降低小麦产量及面粉吸水率,但同时会提高小麦的蛋白质、面筋含量及面团形成时间、稳定时间和粉质质量。本研究可为旱碱地小麦品种的应用和品种改良提供一定的依据。

关键词：旱碱胁迫小麦产量籽粒品质

Effects of coagulation-bath conditions on polyphenylsulfone ultrafiltration membranes

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Chinese Journal of Chemical Engineering 2021年第6期34卷 332-340页

作者： Zhenghui Liu Jun Xiang Xiaoli Hu Penggao Cheng Lei Zhang Wei Du Songbo Wang na tang Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization College of Chemical Engineering and Materials ScienceTianjin University of Science and TechnologyTianjin 300457China

Polyphenylsulfone(PPSU)ultrafiltration membrane with different structures was prepared by nonsolvent-induced phase *** effects of coagulation bath conditions(concentration and temperature)on membrane morphology,pure water flux,pore size,porosity,and contact angle were studied and discussed based on ternary-phase *** indicated that water had stronger coagulant power than ethanol,and that the morphology of the membrane prepared from the polyphenylsulfone/1-methyl-2-pyrrolidinone/H_(2)O(PPSU/NMP/H_(2)O)system had finger-like ***,sponge-like structures were observed for the PPSU/NMP/(NMP-H_(2)O)and PPSU/NMP/(70 NMP-EtOH-H_(2)O)*** also greatly influenced on membrane *** to the Scanning electronic microscopy(SEM)image,the composition(mass fraction)of casting solution is 16%PPSU-84%NMP and the coagulation bath consisting of 70%NMP-26%H_(2)O-4%C_(2)H_(5)***,the PPSU ultrafiltration membrane with spong-like was prepared under 8℃coagulation *** formation of sponge-like structure reduces the pure water flux of ppsu membrane from 488.39 L·m^(-2)·h^(-1)to 36.04 L·m^(-2)·h^(-1).It also reduces the gas permeability,porosity,and pore size of the *** addition of ethanol and NMP into the coagulation bath increases the roughness of the PPSU ultrafiltration membrane and reduces the hydrophilicity of the membrane.

关键词： PPSU ultrafiltration membrane Ternary-phase diagram Coagulation bath conditions Sponge-like structures