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A significantly enhanced magnetic moment due to an electric dipole moment

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Communications in Theoretical Physics 2023年第12期75卷 174-177页

作者： Zhening fang jian-Hua jiang Haiping fang Center for Transformative Science ShanghaiTech UniversityShanghai201210China School of Physical Science and Technology and Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow University1 Shizi StreetSuzhou 215006China School of Physics East China University of Science and TechnologyShanghai200237China Wenzhou Institute University of Chinese Academy of SciencesWenzhouZhejiang 325000China

We demonstrate via first-principle calculations based on the density functional theory that the magnetic moment of a helium atom under a given magnetic field has a positive correlation with the electric dipole moment when an external electric field is applied to the *** calculation shows that the enhancement of the magnetic moment is significant due to the reduction of the triplet-singlet *** argue that this finding can be generalized to organic molecules,especially to macromolecules where the structure induced an electric dipole moment which may give rise to significantly enhanced responses to the external magnetic *** results suggest that considerable magnetic responses prevail,particularly in bio-molecules without an inversion center.

关键词： magnetic moment helium atom electric dipole moment

Strength and ductility synergy of Nb-alloyed Ni_(0.6)CoFe_(1.4) alloys

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International Journal of Minerals,Metallurgy and Materials 2023年第4期30卷 707-714页

作者： jian Wu Heguo zhu Zonghan Xie College of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China School of Mechanical Engineering University of AdelaideSA 5005Australia

Designing strong, yet ductile, and body-centered cubic(BCC) medium-entropy alloys(MEAs) remains to be a challenge *** this study, the strength–ductility trade-off of Ni_(0.6)CoFe_(1.4)MEAs was tackled via introducing a BCC + face-centered cubic(FCC) dual-phase microstructure. Ni_(0.6)CoFe_(1.4)Nbx(x = 0, 0.05, 0.08, 0.10, and 0.15, in molar ratio) MEAs were prepared using vacuum induction melting. Results show that the new alloy is composed of BCC plus FCC dual phases featuring a network-like structure, and the BCC phase is the main phase in this alloy system. Moreover, the Nb0.10 MEA shows high strength and respectable tensile ductility, representing the best combination of the strength and fracture elongation among the alloys studied here. The remarkable strength of the Nb0.10 MEA is attributed to the combined effect of the solid solution strengthening, the precipitation hardening effect and the interface strengthening effect.

关键词： medium-entropy alloys alloying microstructure mechanical properties strengthening

Shear behaviours of cohesionless mixed soils using the DEM:The influence of coarse particle shape

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Particuology 2021年第2期19卷 151-165页

作者： Yangui zhu jian Gong Zhihong Nie School of Civil Engineering Central South UniversityChangsha 410075China

The coarse particles in mixed soils can be cobbles or gravels,with the main difference being their roundness(an indicator describing particle shape characteristics at an intermediate scale).The influence of coarse particle shape(i.e.,roundness)on the macroscopic and microscopic shear behaviours of cohesionless mixed soils with various fines contents(FCs)was investigated via the discrete element method in this *** shapes of coarse particles were formed using the rotation-invariant spherical harmonic method proposed by previous *** equation was proposed to predict the initial void ratios of samples in this study.A decrease in the roundness of coarse particles can increase the peak friction angle(FC≤40%)and critical friction angle(FC≤30%).As the roundness of coarse particles decreases,the peak dilatancy angle initially increases and then decreases(FC≤20%).Furthermore,it was found that the roundness of coarse particles hardly affects the classification of cohesionless mixed soils,as determined by probing the percentage contributions of coarse-coarse,coarse-fine,and fine-fine *** cohesionless mixed soils change from an underfilled structure to an interactive-underfilled structure at the critical state,the main forms of coarse-coarse contacts were ***,the force-fabric anisotropy mechanisms of the influences of the roundness and rolling resistance coefficient of coarse particles on the shear strengths of cohesionless mixed soils were found to be different.

关键词： Cohesionless mixed soils Particle shape Roundness Shear behaviours Discrete element method

Mean estimation over numeric data with personalized local differential privacy

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Frontiers of Computer Science 2022年第3期16卷 183-192页

作者： Qiao XUE Youwen zhu jian WANG College of Computer Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106China Guangxi Key Laboratory of Trusted Software Guilin University of Electronic TechnologyGuilin 541004China School of Cyber Security Gansu University of Political Science and LawLanzhou 730070China

The fast development of the Internet and mobile devices results in a crowdsensing business model,where individuals(users)are willing to contribute their data to help the institution(data collector)analyze and release useful ***,the reveal of personal data will bring huge privacy threats to users,which will impede the wide application of the crowdsensing *** settle the problem,the definition of local differential privacy(LDP)is ***,to respond to the varied privacy preference of users,resear-chers propose a new model,i.e.,personalized local differential privacy(PLDP),which allow users to specify their own privacy *** this paper,we focus on a basic task of calculating the mean value over a single numeric attribute with *** on the previous schemes for mean estimation under LDP,we employ PLDP model to design novel schemes(LAP,DCP,PWP)to provide personalized privacy for each *** then theoretically analysis the worst-case variance of three proposed schemes and conduct experiments on synthetic and real datasets to evaluate the performance of three *** theoretical and experimental results show the optimality of PWP in the low privacy regime and a slight advantage of DCP in the high privacy regime.

关键词： personalized local differential privacy mean estimation crowdsensing model

A review on lithium-sulfur batteries:Challenge,development,and perspective

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Nano Research 2023年第6期16卷 8097-8138页

作者： Qinjun Shao Shengdong zhu jian Chen Advanced rechargeable battery Laboratory Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China

Lithium-sulfur(Li-S)battery is recognized as one of the promising candidates to break through the specific energy limitations of commercial lithium-ion batteries given the high theoretical specific energy,environmental friendliness,and low *** the past decade,tremendous progress have been achieved in improving the electrochemical performance especially the lifespan by various strategies mainly concentrated on the sulfur *** this review,the fundamental electrochemistry of sulfur cathode and lithium anode is revealed to understand the current *** the advances achieved through diverse strategies are comprehensively summarized,which involves lithium polysulfides(LiPSs)limitation,sulfur redox reaction regulation and electrocatalysis in sulfur cathode and artificial solid electrolyte interface(SEI),electrolyte design,and structured anode in lithium ***,the differences between laboratory level coin cells and actual pouch cells need to be addressed that only few reports on practical Li-S pouch cell are available due to the unexpected problems on both sulfur cathode and lithium anode which are masked at lithium and electrolyte ***,the challenges and perspective toward the practical Li-S batteries are also offered.

关键词： lithium-sulfur batteries shuttle effect lithium dendrite solid electrolyte interface Coulombic efficiency

Influence of the rolling-resistance-based shape of coarse particles on the shear responses of granular mixtures

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Particuology 2020年第5期18卷 67-82页

作者： Yangui zhu Zhihong Nie jian Gong School of Civil Engineering Central South UniversityChangsha 410075China School of Hydraulic Engineering Changsha University of Science and TechnologyChangsha 410114China

Shear responses of dense granular mixtures of spherical coarse particles with the rolling resistance and spherical fine particles are studied via triaxial compression tests using the discrete element *** macroscale responses(shear strength and dilatancy)are *** the results with those in the literature indicates that granular mixtures with a rolling resistance coefficient of 0.5 have similar macroscale responses to those of gravel-shaped coarse particle *** quantify the microscale responses including the percentage contributions of contact types,partial coordination number,average particle rotation,average degree of interlocking,and local structural properties,A detailed analysis of the force-fabric anisotropy reveals the mechanisms of the variations in the shear strength with the rolling resistance coefficient and the fines *** mechanism of the variation in the shear strength with the fines content for granular mixtures with a rolling resistance coefficient of 0.5 is different from that for gravel-shaped coarse particle ***,we find that a rolling resistance linear model weakens the linear relationship between the stress ratio and the fabric anisotropy of strong and non-sliding contacts when the fines content is 30% and 40%.

关键词： Granular mixture Rolling resistance Particle shape Fines content Macroscale and microscale responses Anisotropy

Role of permafrost in resilience of social-ecological system and its spatio-temporal dynamics in the source regions of Yangtze and Yellow Rivers

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Journal of Mountain Science 2019年第1期16卷 179-194页

作者： fang Yi-ping zhu Fu-biao YI Shu-hua QIU Xiao-ping DING Yong-jian Institute of Mountain Hazards and Environment Chinese Academy of Sciences College of Resource and Environment University of Chinese Academy of Sciences School of Economics Hefei University of Technology School of Geographic Sciences Nantong University College of Geography and Resources Science Sichuan Normal University State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences

Permafrost is one of the key components of terrestrial ecosystem in cold regions. In the context of climate change, few studies have investigated resilience of social ecological system(SER) from the perspective of permafrost that restricts the hydrothermal condition of alpine grassland ecosystem. In this paper, based on the structural dynamics, we developed the numerical model for the SER in the permafrost regions of the source of Yangtze and Yellow Rivers, analyzed the spatial-temporal characteristics and sensitivity of the SER, and estimated the effect of permafrost change on the SER. The results indicate that: 1) the SER has an increasing trend, especially after 1997, which is the joint effect of precipitation, temperature, NPP and ecological conservation projects; 2) the SER shows the spatial feature of high in southeast and low in northwest,which is consistent with the variation trends of high southeast and low northwest for the precipitation, temperature and NPP, and low southeast and high northwest for the altitude; 3) the high sensitive regions of SER to the permafrost change have gradually transited from the island distribution to zonal and planar distribution since 1980, moreover, the sensitive degree has gradually reduced; relatively, the sensitivity has high value in the north and south, and low value in the south and east; 4) the thickness of permafrost active layer shows a highly negative correlation with the SER. The contribution rate of permafrost change to the SER is-4.3%, that is, once the thickness of permafrost active layer increases 1 unit, the SER would decrease 0.04 units.

关键词： Resilience of social ecological system Permafrost Permafrost active layer thickness Structural dynamic equation Source regions of Yangtze and Yellow rivers

Discovery and synthesis of N^2,N^4-substitued-cycloalkyl[d]pyrimidine-2,4-diamine analogs: The first examples of small-molecular FGFR-1 activator

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Chinese Chemical Letters 2014年第7期25卷 989-994页

作者： Bao-Li Li fang Xiao Wen-Chao Lu Yu-Yun Sun Jin zhu jian Li Shanghai Key Laboratory of New Drug Design School of Pharmacy East China University of Science and Technology Department of Pharmacy The Second Hospital of Jilin University China Resources Double-Crane Pharmaceutical Co. Ltd.

A series of novel, cycloalkyl-modified pazopanib analogs 2 and 3 were designed and synthesized. Their kinase modulatory effects on FGFR-1, VEGFR-2, PDGFR-β and c-KIT were evaluated by the caliper mobility shift assay. Introduction of cycloalkyl into the pyrimidine linker of pazopanib almost abolished the four kinases inhibitory potency of compounds 2 and 3, but surprisingly, resulted in good activation effects on FGFR-1. Compounds 3d and 3g showed double-digit, nanomolar, selective activation effects on FGFR-1, and could be classified as first-generation small molecular activators of FGFR-1 kinase.

关键词： Cycloalkyl[d]pyrimidine derivatives FGFR-1 Activator Chemical probe

Drug-induced erythroderma in patients with acquired immunodeficiency syndrome

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World Journal of Emergency Medicine 2021年第4期12卷 299-302页

作者： Wei-fang zhu De-ren fang Hong fang Department of Dermatology the First Affi liated Hospital of Zhejiang University School of MedicineHangzhou 310003China

BACKGROUND: To explore the clinical manifestations, diagnosis, and treatment of patients with acquired immunodeficiency syndrome(AIDS) complicated with drug-induced ***: The clinical data of 12 AIDS patients with drug-induced erythroderma in our hospital were retrospectively analyzed. The general information, offending medications, complications, modified severity-of-illness score for toxic epidermal necrolysis(SCORTEN) scores, and disease outcome spectrums were ***: Drug-induced erythroderma was mostly caused by antiviral drugs, antituberculosis drugs, antibiotics, traditional Chinese medicine, and immune checkpoint inhibitors. The spectrum of sensitizing drugs was broad, the clinical situation was complex, and infections were common. The affected areas were greater than 40% body surface area in all patients. The modified SCOTERN score averaged 3.01±0.99. All patients were treated with glucocorticoids, and nine patients were treated with intravenous immunoglobulin(IVIG) pulse therapy at the same time. The average time to effectiveness was 7.08±2.23 days, and the average hospital stay was 17.92±8.46 days. Eleven patients were cured, and one patient died of secondary multiple infections, who had a modified SCORTEN score of 5 points. The mortality rate in this study was 8.3%.CONCLUSIONS: The clinical situation of AIDS patients with drug-induced erythroderma in hospitalized patients is complex and the co-infection rate is high. The use of modified SCORTEN score may objectively and accurately assess the conditions, and the use of glucocorticoid combined with IVIG therapy may improve the prognosis.

关键词： Acquired immunodeficiency syndrome Drug eruption Erythroderma Modified severity-of-illness score for toxic epidermal necrolysis