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Nuclear current and antimagnetic rotation in ^(105)Cd

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Science China(Physics,Mechanics & Astronomy) 2012年第12期55卷 2420-2424页

作者： liu lang ZHAO PengWei State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China

The effects of the nuclear current in the antimagnetic rotation band of 105Cd have been investigated in a fully self-consistent and microscopic way by using the tilted axis cranking relativistic mean-field *** was found that the inclusion of nuclear current leads to a higher angular momentum and thus a larger kinetic moment of inertia at a given rotational *** a consequence,the B(E2) values with current are always smaller than those without current.

关键词： covariant density functional theory tilted axis cranking model nuclear current antimagnetic rotation

Crucial role of charge transporting layers on ion migration in perovskite solar cells

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Journal of Energy Chemistry 2020年第8期29卷 132-137,I0005页

作者： Abasi Abudulimu lang liu Guilin liu Nijiati Aimaiti Bohuslav Rezek Qi Chen Faculty of Electrical Engineering Czech Technical UniversityPragueCzechia School of Materials and Engineering Beijing Institute of TechnologyBeijing 102488China School of Science Jiangnan UniversityWuxi 214122JiangsuChina IMDEA Nanociencia Madrid 28049Spain

The device preconditioning dependent hysteresis and the consequential performance degradation hinder the actual performance and stability of the perovskite solar cells. Ion migration and charge trapping in the perovskite with large contribution from grain boundaries are the most common interpretations for the hysteresis. Yet, the high performing devices often include intermediate hole and electron transporting layers, which can further complicate the dynamical process in the device. Here, by using Kelvin Probe Force Microscopy and Confocal Photoluminescence Microscopy, we elucidate the impact of chargetransporting layers and excess MAI on the spatial and temporal variations of the photovoltage on the MAPbI3-based solar cells. By studying the devices layer by layer, we found that the light-induced ion migration occurs predominantly in the presence of an imbalanced charge extraction in the solar cells, and the charge transporting layers play crucial role in suppressing it. Careful selection and processing of the electron and hole-transporting materials are thus essential for making perovskite solar cells free from the ion migration effect.

关键词： Perovskite solar cells Ion migration KPFM Charge transporting material

喷雾与真空冷冻干燥方法对肉苁蓉红枣复合固体饮料品质的影响

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食品与发酵工业 2025年第1期51卷 259-265页

作者：刘朗张珍李蔚杜建明史建莉陈宜轩金丽娜甘肃农业大学食品科学与工程学院甘肃兰州730070

该研究以甘肃特色资源荒漠肉苁蓉和红枣为原料,分别采用喷雾干燥(spray drying,SD)、真空冷冻干燥(vacuum freeze drying,VFD)制备固体饮料,探究不同干燥方法对固体饮料的微观结构、感官状态、物理性质、吸湿性、溶解能力及抗氧化能力... 详细信息

该研究以甘肃特色资源荒漠肉苁蓉和红枣为原料,分别采用喷雾干燥(spray drying,SD)、真空冷冻干燥(vacuum freeze drying,VFD)制备固体饮料,探究不同干燥方法对固体饮料的微观结构、感官状态、物理性质、吸湿性、溶解能力及抗氧化能力的影响。结果表明,VFD较SD样品孔状结构小而多;SD样品ΔE为35.37,VFD样品ΔE为46.25,色差明显;感官发现饮料品质存在差异;物理指纹图谱分析得到SD较VFD样品具有良好的可压性、均一性,SD和VFD样品相似度为9.68%;SD样品吸湿率为19.64%,VFD样品吸湿率为18.99%,SD样品吸湿加速度小,为-0.0026 g/h^(2);SD样品溶解能力较VFD好,溶解性为96.58%,溶解时间为52.38 s,湿润下沉时间为89.85 s;模拟体外消化发现,SD较VFD样品DPPH自由基清除率好,消化结束后SD与VFD样品DPPH自由基清除率分别下降了50.64%、53.03%。分析得到干燥方法影响了固体饮料的微观结构,最终使不同干燥方法所得固体饮料的感官、物理性质与抗氧化能力等品质呈现出差异。该研究为荒漠肉苁蓉与红枣的开发提供了支撑和参考。

关键词：喷雾干燥真空冷冻干燥固体饮料物理指纹图谱抗氧化活性

Gravitational and electromagnetic radiation from binary black holes with electric and magnetic charges:hyperbolic orbits on a cone

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Communications in Theoretical Physics 2023年第6期75卷 103-111页

作者： Zu-Cheng Chen Sang Pyo Kim lang liu Department of Astronomy Beijing Normal UniversityBeijing 100875China Advanced Institute of Natural Sciences Beijing Normal UniversityZhuhai 519087China Department of Physics and Synergistic Innovation Center for Quantum Effects and Applications Hunan Normal UniversityChangshaHunan 410081China Department of Physics Kunsan National UniversityKunsan 54150Korea

We derive the hyperbolic orbit of binary black holes with electric and magnetic *** the low-velocity and weak-field regime,by using the Newtonian method,we calculate the total emission rate of energy due to gravitational and electromagnetic radiation from binary black holes with electric and magnetic charges in hyperbolic ***,we develop a formalism to derive the merger rate of binary black holes with electric and magnetic charges from the twobody dynamical *** apply the formalism to investigate the effects of the charges on the merger rate for the near-extremal case and find that the effects cannot be ignored.

关键词： gravitational waves magnetic charges black holes

Three novel photoisomeric compounds of the 4-acyl pyrazolone derivants: Crystal structures and substituent effects on photo-isomerism in solid state

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Science China Chemistry 2008年第7期51卷 661-668页

作者： WANG JunHua liu lang liu GuangFei GUO JiXi JIA DianZeng Institute of Applied Chemistry Xinjiang UniversityUrumqi 830046China

Three new photoisomeric compounds: 1,3-diphenyl-4-benzal-5-pyrazolone 4-methylthiosemicarbazone (DPBP-MTSC), 1,3-diphenyl-4-(4′-methylbenzal)-5-pyrazolone 4-methylthiosemicarbazone (DP4MBP- MTSC), and 1,3-diphenyl-4-(4′-bromobenzal)-5-pyrazolone 4-methylthiosemicarbazone (DP4BrBP-MTSC) were synthesized by direct condensation of pyrazolones and 4-methylthiosemicarbazone. Their struc- tures were confirmed using 1H NMR, IR, elemental analyses, and X-ray crystallographic analyses. The photoisomeric properties in the solid state were studied under UV light irradiation and the photo- isomerization phenomena were interpreted by the double proton-transfer mechanism. Moreover, the effects of different substituent groups at the 4-position of the benzal in the three compounds on the photoisomeric properties were discussed.

关键词： photoisomerization pyrazolone proton-transfer substitute effects

3D printing of high-performance micro-supercapacitors with patterned exfoliated graphene/carbon nanotube/silver nanowire electrodes

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Science China(Technological Sciences) 2021年第5期64卷 1065-1073页

作者： liu lang LU JunYong LONG XinLin ZHOU Ren liu YingQuan WU YiTing YAN KangWei National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan 430033China

Micro-supercapacitors(MSCs)show great potential as on-chip energy storage devices for portable *** major flaw of thin-film MSCs is their low energy *** improve the energy density,thicker electrodes are ***,the fabrication of MSCs with thick electrodes remains a *** this work,a novel 3D printing method is employed to fabricate high-performance MSCs with interdigitated exfoliated graphene(EG)/carbon nanotube(CNT)/silver nanowire(Ag NW)*** nanowelding of Ag NW junction plays a critical role in the realization of 3D *** enhance the electrochemical performances of EG,phosphorus atoms are incorporated into the carbon framework with 1.7 at%.The areal capacitance of the 3D printed MSC is 21.6 mF cm^(-2)at a scan rate of 0.01 V s^(-1).The areal energy density of the MSC ranges from 0.5 to 2μWh cm^(-2)with a maximum power density of 2.5 mW cm^(-2).

关键词： micro-supercapacitor 3D printing silver nanowire exfoliated graphene micro-plasma-jet

Heat Storage/Heat Release of Phase-Change Filling Body with Casing Heat Exchanger for Extracting Geothermal Energy

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Journal of Thermal Science 2023年第3期32卷 1171-1189页

作者： ZHANG Xiaoyan XU Muyan liu lang YANG Qixing KI-IL Song Energy School Xi'an University of Science and TechnologyXi'an 710054China Key Laboratory of Western Mines and Hazards Prevention Ministry of Education of ChinaXi'an 710054China Department of Civil Engineering Inha UniversityIncheon 402-751South Korea

Arranging heat exchanger in filling body to extract geothermal energy is an effective way to alleviate the problems of high ground pressure and high ground temperature in deep resource *** body with casing heat exchanger was acted as research object,encapsulating phase change materials(PCMs)in annular *** heat storage and heat release process,the effects of different PCMs on temperature distribution,phase-change process and heat transfer performance were *** result indicates:During heat storage process,the temperature increases rapidly and the melting process is accelerated for the position closer surrounding ***_(2)·6H_(2)O/EG can make filling body complete heat storage process in the shortest time because of its good thermal *** heat storage capacity of PCMs backfill is significantly higher than that of ordinary backfill;it increases by 36.6%-67.3%at heat storage of 10 *** heat release process,the closer to the heat exchange tube,the greater the temperature drop in filling *** maximum value of heat release rate and heat release capacity is in CaCl_(2)·6H_(2)O/EG backfill,it can release 116.4%more heat than RT35backfill after heat release of 12 h,the maximum value of effectiveness and its heat transfer rate also is in CaCl_(2)·6H_(2)O/EG *** paper provides the basic data for the selection of PCMs in phase-change thermal storage filling body.

关键词： flling body heat exchanger phase change material heat storage/heat release

Synthesis and Crystal Structural Characterization of a Thiosemicarbazone Derived from 4-Acylpyrazolone

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Chinese Journal of Structural Chemistry 2006年第10期25卷 1233-1237页

作者： liu Guang-Fei liu lang HU Xin JIA Dian-Zeng YU Kai-Bei Institute of Applied Chemistry Xinjiang University Urumqi 830046 China Chengdu Institute of Organic Chemistry The Chinese Academy of Sciences Chengdu Sichuan 610041 China

The reaction of 4-（p-fluobenzoyl）-2,5-dihydro-3-methyl-1-phenyl pyrazol-5-one with thiosemicarbazide in MeOH followed by recrystallization in EtOH gave rise to yellowish lamellar crystals of 4（p-fluo-a-aminothiocarbonyl hydrazonobenzal）-2,5-dihydro-3-methyl- 1-phenyl pyrazol-5-one 1. It crystallizes in orthorhombic, space group Pbca with a = 18.445（4）, b = 11.987（2）, c = 19.249（4） °A,, V= 4256.1（18）°A^3, Z = 8, Mr = 415.49, Dc= 1.297 g/cm^3, T = 296（2） K, F（000） = 1744,μ（MoKα） = 0.186 cm^-1, R = 0.0521 and wR = 0.1211 for 1661 observed reflections with I 〉 2σ（I）. The compound was structurally characterized by elemental analyses, IR and ^1H NMR. The intermolecular hydrogen bonds are present and a two-dimensional framework is formed by two intermolecular hydrogen bonds in the （001） plane.

关键词： pyrazol-5-one thiosemicarhazide crystal structure synthesis

Experimental study on thermal and mechanical properties of tailings-based cemented paste backfill with CaCl_(2)·6H_(2)O/expanded vermiculite shape stabilized phase change materials

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International Journal of Minerals,Metallurgy and Materials 2023年第2期30卷 250-259页

作者： Xiaoyan Zhang Tianrun Cao lang liu Baoyun Bu Yaping Ke Qiangqiang Du Energy School Xi’an University of Science and TechnologyXi’an 710054China Key Laboratory of Western Mines and Hazards Prevention Ministry of Education of ChinaXi’an 710054China School of Architecture and Civil Engineering Xi’an University of Science and TechnologyXi’an 710054China

CaCl_(2)·6H_(2)O/expanded vermiculite shape stabilized phase change materials(CEV)was prepared by atmospheric impregnation *** gold mine tailings as aggregate of cemented paste backfill(CPB)material,the CPB with CEV added was prepared,and the specific heat capacity,thermal conductivity,and uniaxial compressive strength(UCS)of CPB with different cement-tailing ratios and CEV addition ratios were tested,the influence of the above variables on the thermal and mechanical properties of CPB was *** results show that the maximum encapsulation capacity of expanded vermiculite for CaCl_(2)·6H_(2)O is about 60%,and the melting and solidification enthalpies of CEV can reach 98.87 J/g and 97.56 J/g,*** the CPB without CEV,the specific heat capacity,thermal conductivity,and UCS decrease with the decrease of cement-tailing *** the CPB with CEV added,with the increase of CEV addition ratio,the specific heat capacity increases significantly,and the sensible heat storage capacity and latent heat storage capacity can be increased by at least 10.74%and 218.97%respectively after adding 12%***,the addition of CEV leads to the increase of pores,and the thermal conductivity and UCS both decrease with the increase of CEV *** cement-tailing ratio is 1:8 and 6%,9%,and 12%of CEV are added,the 28-days UCS of CPB is less than 1 *** the heat storage capacity and cost price of backfill,the recommended proportion scheme of CPB material presents cement-tailing ratio of 1:6 and 12%CEV,and the most recommended heat storage/release temperature cycle range of CPB with added CEV is from 20 to 40℃.This work can provide theoretical basis for the utilization of heat storage backfill in green mines.

关键词： CaCl_(2)·6H_(2)O/expanded vermiculite shape stabilized phase change materials cemented paste backfill thermal property mechanical property