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Triple points and phase transitions of D-dimensional dyonic Ad S black holes with quasitopological electromagnetism in Einstein–Gauss–Bonnet gravity

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Chinese Physics B 2024年第6期33卷 272-287页

作者：牟平辉蒋青权何柯腱李国平 School of Physics and Astronomy China West Normal UniversityNanchong 637000China College of Physics Chongqing UniversityChongqing 401331China

By considering the negative cosmological constant Λ as a thermodynamic pressure, we study the thermodynamics and phase transitions of the D-dimensional dyonic Ad S black holes(BHs) with quasitopological electromagnetism in Einstein–Gauss–Bonnet(EGB) gravity. The results indicate that the small/large BH phase transition that is similar to the van der Waals(vdW) liquid/gas phase transition always exists for any spacetime dimensions. Interestingly, we then find that this BH system exhibits a more complex phase structure in 6-dimensional case that is missed in other ***, it shows for D = 6 that we observed the small/intermediate/large BH phase transitions in a specific parameter region with the triple point naturally appeared. Moreover, when the magnetic charge turned off, we still observed the small/intermediate/large BH phase transitions and triple point only in 6-dimensional spacetime, which is consistent with the previous results. However, for the dyonic Ad S BHs with quasitopological electromagnetism in Einstein–Born–Infeld(EBI) gravity, the novel phase structure composed of two separate coexistence curves observed by Li et al. [Phys. Rev. D105 104048(2022)] disappeared in EGB gravity. This implies that this novel phase structure is closely related to gravity theories, and seems to have nothing to do with the effect of quasitopological electromagnetism. In addition, it is also true that the critical exponents calculated near the critical points possess identical values as mean field theory. Finally, we conclude that these findings shall provide some deep insights into the intriguing thermodynamic properties of the dyonic Ad S BHs with quasitopological electromagnetism in EGB gravity.

关键词： AdS black hole phase transition triple point

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TiS2-based saturable absorber for ultrafast fiber lasers

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Photonics Research 2018年第10期6卷 I0046-I0050页

作者： x. ZHU S. CHEN M. ZHANG L. CHEN q. Wu J. ZHAO q．jiang Z．ZHENG H．ZHANG School of Electronic and Information Engineering Beihang University Beijing 100191 China Department of Optoelectronics Engineering Shenzhen University Shenzhen 518060 China College of Health Science and Environmental Engineering Shenzhen Technology University Shenzhen 518118 China College of Materials Science and Engineering Shenzhen University Shenzhen 518060 China

We fabricate titanium disulfide(TiS2) using a liquid exfoliation method and subsequently a TiS2-based device by optically depositing the TiS2 material onto the microfiber. This device exhibits a strong nonlinear saturable absorption property with an optical modulation depth of 8.3% at 1560 nm. With the implementation of this all-fiber TiS2-based saturable absorber, we demonstrate that both mode-locking and q-switching operation can be obtained in a turn-key all-fiber erbium-doped laser cavity. Our findings constitute the first example, to the best of our knowledge, of a TiS2-based saturable absorber for ultrashort pulse generation and highlight the great potential of such devices in two-dimensional nanomaterials-related photonics.

关键词：液体剥离方法激光器通讯技术发展现状

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Corrosion protection of NiNb metallic glass coatings for 316SS by magnetron sputtering

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Journal of Materials Science & Technology 2021年第20期79卷 88-98页

作者： L.jiang Z.q.Chen H.B.Lu H.B.Ke Y.Yuan Y.M.Dong x.K.Meng School of Chemistry and Life Sciences Suzhou University of Science and TechnologySuzhou 215009China Institute of Materials Engineering National Laboratory of Solid State MicrostructuresCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210009China Songshan Lake Materials Laboratory Dongguan 523808China Institute of Physics Chinese Academy of SciencesBeijing 100190China Institute of Materials Engineering Nanjing UniversityNantong 226019China College of Chemistry and Chemical Engineering Nantong UniversityNantong 226019China

Metallic glasses(MGs)appear as promising anti-corrosion coating materials due to their microstructural and physicochemical ***,we proposed magnetron sputtered NiNb thin film MG coatings(MGCs)with different structures and compositions for corrosion protection of 316 stainless steel in an aggressive saline *** properties of monolayered Ni_(50)Nb_(50) and Ni_(60)Nb_(40),as well as the multilayered Ni_(50)Nb_(50)/Ni_(60)Nb_(40)(at.%)MGCs,were characterized in terms of morphology and microstructural properties,as well as the anticorrosion *** the NiNb MGCs presented compact structure and the monolayered coatings exhibited preferable adhesion properties in comparison with the multilayered *** electrochemical tests and xPS results imply that the monolayered Ni_(50)Nb_(50) MGC with high Nb content resisted corrosion mainly due to the formation of stable passive film that contained abundant Nb_(2)O_(5) species,whereas the Ni_(60)Nb_(40) MGC with high Ni content showed week corrosion protection performance during long-term service due to the dissolution of Ni cations and the devastation of the coating *** with bit worse adhesion and more vulnerable Ni_(60)Nb_(40) layers,the multilayered Ni_(50)Nb_(50)/Ni_(60)Nb_(40) MGC possessed comparable corrosion resistance with the monolayered Ni_(50)Nb_(50) MG coating,which remained stable even after 32 days of *** performance should be ascribed to the combined eff;ect of the repassivation property for the sub-layers,the hindrance of propagation paths of micro-defects,and the obstruction of corrosive species by interfaces in the multilayered coating.

关键词： Magnetron sputtering NiNb Metallic glasses Multilayer Corrosion protection

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Synthesis of New Squarains Used as Organic Electroluminescent Materials

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Chinese Chemical Letters 1997年第5期8卷 403-406页

作者： Liu, N Lu, ZY xie, MG jiang, q SICHUAN UNIV DEPT CHEMCHENGDU 610064PEOPLES R CHINA

Two types of eight kinds of new squarains were designed and synthesized. Their structures were elucidated by IR,NMR,MS and elementary analysis. Their luminescent properties were determined,which indicated that they ca... 详细信息

关键词： OC Cl

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Flow variation and circulation process of saline springs in the Nangqen Basin， Tibetan Plateau

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Journal of Earth Science 2024年

作者： Jibin Han Jianping Wang Hongkui Ma Yongshou Li Zhao An Yong xiao Wenhua Han Huaide Cheng Haizhou Ma Hongchen jiang Key Laboratory of Green and High-end Utilization of Salt Lake Resources， qinghai Institute of Salt Lakes， Chinese Academy of Sciences qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes， qinghai Institute of Salt Lakes， Chinese Academy of Sciences qinghai Geological Survey Faculty of Geosciences and Engineering， Southwest Jiaotong University State Key Laboratory of Biogeology and Environmental Geology， China University of Geosciences

There was limited knowledge about the flow fluctuations and cycling processes of saline springs in the Nangqen Basin in the Sanjiang tectonic zone. In this work， the flow variation of the saline springs during the wet and dry seasons were monitored using volumetric and cross-sectional methods， and the cycling process of the saline springs was quantitatively identified using the integrated hydrochemical and isotopic methods. The results show that most saline springs in the Nangqen Basin had significantly different flow rates， ion concentrations， and TDS concentrations. The ions mainly come from carbonate and sulfate minerals. There is no internal hydraulic connection between these saline springs， and the impact of seasonal changes on the flow is relatively small， indicating that the saline springs originate mainly from deep circulation. The recharge elevation of the saline springs ranges 3661–4990 m， with an average of 4100 m. The circulation depth of the saline springs ranges 240–570 m， with an average of 431 m. The recycle time ranges 1.15–30.86 years， with an average of 15.66 years. These results could provide a scientific basis for the development and utilization of saline spring resources in the Nangqen Basin.

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EFFECTS OF TREATMENT TEMPERATURE ON THE MICROSTRUCTURE AND MAGNETIC PROPERTIES OF Fe-N THIN FILMS

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Acta Metallurgica Sinica(English Letters) 2007年第4期20卷 293-300页

作者： B.L. Li H.M. Du x.F. Wang E.Y. jiang Z.q.Li P. Wu Department of Applied Physics Institute of Advanced Materials Physics School of Science Tianjin University Tianjin 300072 China Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology Tianjin University Tianjin 300072 China

Fe-N thin films were fabricated on both 100Si and NaCl substrates by RF magnetron sputtering under low nitrogen partial pressure. The microstructure and magnetic properties of Fe-N thin films were investigated with the increase of the substrate temperature （Ts） and the annealing temperature （Ta）. It is more difficult for nitrogen atoms to enter the Fe lattice under higher Ts above 150℃. The phase evolution is visible at higher Ta above 200℃. The phase transformation of α＇＇-Fe16N2 occurred at 400℃. The change of crystal size with Ta was clearly visible from bright and dark field images. The clear high-resolution electron microscope （HREM） images of 110α, 111γ＇, 112α＇＇, and 200α＇＇ phases were observed. The interplanar distances from TEM （transmission electron microscope） and HREM match the calculated values very well. From the results of the vibrating sample magnetometer （VSM）, the good magnetic properties of Fe-N films were obtained at 150℃ of Ts and 200℃ of Ta, respectively.

关键词： Fe-N thin film magnetic property HREM α''-Fe16N2

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Association between MTHFR c.677C>T variant and erectile dysfunction among males attending fertility clinic

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Asian Journal of Andrology 2024年第1期26卷 41-45页

作者： Shun Bai Ming-Zhen Li Yang-Yang Wan xue-Chun Hu Yi-xun Liu xian-Hong Tong Tong-Hang Guo Lu Zong Ran Liu Yuan-qi Zhao Ping xiang Bo xu xiao-Hua jiang Department of Gynecology and Obstetrics Reproductive and Genetic HospitalThe First Affiliated Hospital of University of Science and Technology of ChinaDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei 230001China NHC Key Laboratory of Male Reproduction and Genetics Guangdong Provincial Reproductive Science Institute(Guangdong Provincial Fertility Hospital)Guangzhou 510600China Department of Urology The First Affiliated Hospital of University of Science and Technology of ChinaDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei 230001China Wannan Medical College Wuhu 241002China

Genetic risk factors have been shown to contribute to the development of sexual ***,the role of methylenetetrahydrofolate reductase(MTHFR)gene variants in the risk of erectile dysfunction(ED)remains *** this study,we recruited 1254 participants who underwent ED assessed by the International Index of Erectile *** MTHFR c.677C>T variant was also measured by fluorescence polymerase chain reaction(PCR).No significant difference in the genotypic frequency of the MTHFR C677T polymorphism(CC,CT,and TT)was observed between men from the ED and non-ED *** addition,on binary logistic regression analysis,both crude and adjusted models showed that the risk of ED was not significantly associated with the C677T ***,a significantly higher frequency of the 677TT polymorphism was found in severe and moderate ED(P=O.02).The positive correlation between the MTHFR 677TT polymorphism and severe ED was confirmed by logistic regression analysis,even after adjusting for potential confounders(odds ratio[OR]=2.46,95%confidence interval[CI]:1.15-5.50,P=0.02).These findings suggest a positive correlation between the MTHFR 677TT polymorphism and the risk of severe *** of MTHFR gene polymorphisms may provide complementary information for ED patients during routineclinicaldiagnosis.

关键词： erectile dysfunction gene variant genetic risk factors methylenetetrahydrofolate reductase sexual function

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非饱和土地基中双层波阻板屏障对S波的隔离效应研究

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地震工程学报 2024年第5期46卷 1126-1141页

作者：江烨马强青海大学土木工程学院青海西宁810016 青海省建筑节能材料与工程安全重点实验室青海西宁810016

在传统波阻板的基础上,将屏障隔振改进为相同厚度的双层波阻板。基于非饱和多孔介质和弹性介质中的波动理论,研究非饱和土地基中双层波阻板对S波的隔离效应。根据Helmholtz原理,获得S波入射下非饱和土地基中设置双层波阻板后地表竖向位... 详细信息

在传统波阻板的基础上,将屏障隔振改进为相同厚度的双层波阻板。基于非饱和多孔介质和弹性介质中的波动理论,研究非饱和土地基中双层波阻板对S波的隔离效应。根据Helmholtz原理,获得S波入射下非饱和土地基中设置双层波阻板后地表竖向位移解答。首先研究双层波阻板的材料参数对其隔振性能的影响规律,研究发现通过调控双层波阻板的密度和剪切模量能够使双层波阻板隔振屏障获得最优隔振效果;然后对比双层波阻板与相同材质的单层均质波阻板的隔振效果,并分析入射角、频率、饱和度、波阻板的厚度和埋深等物理力学参数对其隔振性能的影响规律。研究结果表明:同一厚度的波阻板隔振体系中,双层波阻板的隔振效率比同等材质的单层波阻板分别提高了49.18%和42.59%;双层波阻板对低频、中频和高频的环境振动均有较好的隔振效果。

关键词：双层波阻板环境振动隔振效果非饱和土振幅衰减系数

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INFLUENCE OF TEMPERATURE AND PRESSURE ON THE KINETICS OF Mg-6mol%LaNi PREPARED BY HYDRIDING COMBUSTION SYNTHESIS

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Acta Metallurgica Sinica(English Letters) 2006年第2期19卷 124-132页

作者： q. Li K.C. Chou K.D. xu L.J. jiang J.Y. Zhang x.G. Lu School of Materials Science and Engineering Shanghai University Shanghai 200072 China Department of Physical Chemistry University of Science and Technology Beijing Beijing 100083 China General Research Institute for Nonferrous Metals Beijing 100088 China

A new model to study the hydriding/dehydriding （H/D） kinetic mechanism has been applied in the two-phase （α-β） region of the Mg-6mol%LaNi composite at temperature and pressure ranging from 523 to 623K and 0.256 to 0.992MPa H2. respectively. The coincidence of the theoretical calculation with the experimental data indicates that the rate-limiting step is hydrogen diffusion in the β phase for hydriding process and the diffusion of hydrogen in the α solid solution for hydrogen desorption with activation energies 89500 and 87900J/mol H2 for HID processes, respectively, which were much smaller than those of MgH2 and can be attributed to the La and Ni additions.

关键词： powder metallurgy hydrogen storage materials kinetics

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Accelerated protons with energies up to 70 MeV based on the optimized SG-Ⅱ Peta-watt laser facility

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High Power Laser Science and Engineering 2023年第5期11卷 127-136页

作者： H.H.An W.Wang J.xiong C.Wang x.Pan x.P.Ouyang S.jiang Z.Y.xie P.P.Wang Y.L.Yao N.Hua Y.Wang Z.C.jiang q.xiao F.C.Ding Y.T.Wan x.Liu R.R.Wang Z.H.Fang P.q.Yang Y.E.jiang P.Z.Zhang B.q.Zhu J.R.Sun B.qiao A.L.Lei J.q.Zhu Shanghai Institute of Laser Plasma China Academy of Engineering PhysicsShanghaiChina Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghaiChina Center for Applied Physics and Technology Peking UniversityBeijingChina National Laboratory on High Power Laser and Physics ShanghaiChina

The target backsheath field acceleration mechanism is one of the main mechanisms of laser-driven proton acceleration(LDPA)and strongly depends on the comprehensive performance of the ultrashort ultra-intense lasers used as the driving *** successful use of the SG-II Peta-watt(SG-II PW)laser facility for LDPA and its applications in radiographic diagnoses have been manifested by the good performance of the SG-II PW ***,the SG-II PW laser facility has undergone extensive maintenance and a comprehensive technical upgrade in terms of the seed source,laser contrast and terminal *** experiments were performed using the maintained SG-II PW laser beam,and the highest cutoff energy of the proton beam was obviously ***,a double-film target structure was used,and the maximum cutoff energy of the proton beam was up to 70 *** results demonstrate that the comprehensive performance of the SG-II PW laser facility was improved significantly.

关键词： laser-driven proton acceleration SG-II Peta-watt laser target normal sheath acceleration

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