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Designing multi-shelled metal oxides:towards high energy-density lithium-ion batteries

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Science China Materials 2016年第7期59卷 521-522页

作者： heng-guo Wang Xin-bo Zhang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of Sciences School of Materials Science and Engineering Changchun University of Science and Technology

Lithium ion batteries（LIBs）,which dominate today’s portable electronic market,have been actively investigated as energy sources for hybrid and electric vehicles[1].However,their energy density has still fallen short of the increasing and demanding ***,the most of cathode materials can only reversibly accept one electron and deliver capacities lower than 200mA h *** obtain high-energy LIBs,the cathode mate-

关键词： cathode portable lithium deliver today dominate accept fallen demanding

Chiral Extrapolation of Lattice Data of Λ_b→Λ_c Form Factors

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Communications in Theoretical Physics 2019年第2期71卷 175-191页

作者： Rui-Cheng Li Xin-heng guo College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875China

An extrapolation to the physical limit for the lattice data of Λ_b →Λ_c form factors computed in the nonphysical region is made in this work through a class of fitting functions proposed by us with nonlinear dependence on m2/π derived in the chiral perturbative theory(ChPT) and the heavy quark effective theory(HQET) framework. Then the results are applied to calculate the differential and integrated Λ_b →Λ_c semileptonic decay rates. Meanwhile, a comparison between our results and those obtained through the extrapolation functions with naive linear dependenceon m2/π is *** is shown that the difference between the extrapolated central values of these two cases is about 5%.The total uncertainties(depending on the momentum transfer q^2) in the linear case are about 5% ～10%(caused by the uncertainties of lattice data) and those in the nonlinear case are about 10% ～ 20%(caused by the uncertainties of both lattice data and input parameters in Ch PT and HQET). More accurate lattice data and parameters in ChPT and HQET are needed to reduce the uncertainties of the extrapolated results.

关键词： heavy baryon form factors lattice QCD chiral perturbative theory heavy quark effective theory

Strain rate response of a Zr-based composite fabricated by Bridgman solidification

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International Journal of Minerals,Metallurgy and Materials 2010年第2期17卷 214-219页

作者： Jun-wei Qiao Yong Zhang Ji-heng Li guo-liang Chen State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

Zr58.5Ti14.3Nb5.2Cu6.1Ni4.9Be11.0 bulk metallic glass matrix composites,containingβ-Zr dendrites,were fabricated by Bridgman solidification at the withdrawal velocity of 1.0 mm/s through a temperature gradient of～45 K/*** to the increasing compressive strain rates,the monotonic increasing and decreasing were obtained for the maximum strength and the fracture strain,*** results show that high strain rate may induce the insufficient time for the interaction between shear bands and the crystalline phase,and early fracture occurs as a *** fractographs are consistent with the mechanical properties,and the failure mode of the present Zr-based composites is in agreement with the frame of the ellipse criterion.

关键词： bulk metallic glass composites Bridgman solidification mechanical properties

Portable multi-amplified temperature sensing for tumor exosomes based on MnO_(2)/IR780 nanozyme with high photothermal effect and oxidase-like activity

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Chinese Chemical Letters 2023年第3期34卷 226-230页

作者： Limin Yang heng guo Ting Hou Bin An Feng Li College of Chemistry and Pharmaceutical Sciences Qingdao Agricultural UniversityQingdao 266109China

Efficient determination of tumor exosomes using portable devices is crucial for the establishment of facile and convenient early cancer diagnostic methods. However, it is still challenging to effectively amplify the detection signal to achieve tumor exosomes detection with high sensitivity by portable devices. To address this issue, we developed a portable multi-amplified temperature sensing strategy for highly sensitive detecting tumor exosomes based on multifunctional manganese dioxide/IR780 nanosheets(MnO_(2)/IR780 NSs) nanozyme with high oxidase-like activity and enhanced photothermal ***, MnO_(2)/IR780 NSs were synthesized via a facile one-step method with mild experimental conditions, which not only exhibited a stronger photothermal effect than that of MnO_(2) but also showed excellent oxidase-like activity that can catalyze the oxidation of 3',3',5',5'-tetramethylbenzidine(TMB) to generate TMB oxide(oxTMB) with a robust photothermal property, thus conjoining with MnO_(2)/IR780 NSs to further enhance the temperature signal. The present assay enables highly sensitive determination of tumor exosomes with the detection limit down to 5.1×10~3 particles/mL, which was comparable or superior to those of the most previously reported sensors. Furthermore, detection of tumor exosomes spiked in biological samples was successfully realized. More importantly, our method showed the recommendable portability, robust applicability, and easy manipulation. By taking advantages of these features,this high-performance photothermal sensor offered a promising alternative means for nondestructive early cancer diagnosis and treatment efficacy evaluation.

关键词： Synergistic signal amplification MnO_(2)/IR780 nanozyme Tumor exosomes Photothermal effect Oxidase-like activity

Nanoscale multi-beam lithography of photonic crystals with ultrafast laser

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Light(Science & Applications) 2023年第8期12卷 1604-1615页

作者： Jiaqun Li Jianfeng Yan Lan Jiang Jiachen Yu heng guo Liangti Qu State Key Laboratory of Tribology in Advanced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China Department of Chemistry Tsinghua UniversityBeijing 100084China

Photonic crystals are utilized in many noteworthy applications like optical communications,light flow control,and quantum *** crystal with nanoscale structure is important for the manipulation of light propagation in visible and near-infrared ***,we propose a novel multi beam lithography method to fabricate photonic crystal with nanoscale structure without *** multi-beam ultrafast laser processing and etching,parallel channels with subwavelength gap are obtained in yttrium aluminum garnet *** optical simulation based on Debye diffraction,we experimentally show the gap width of parallel channels can be controlled at nanoscale by changing phase *** the superimposed phase hologram designing,functional structures of complicated channel arrays distribution can be created in *** gratings of different periods are fabricated,which can diffract incident light in particular *** approach can efficiently manufacture nanostructures with controllable gap,and offer an alternative to the fabrication of complex photonic crystal for integrated photonics applications.

关键词： lithography beam optics

Cross and joint ordinal partition transition networks for multivariate time series analysis

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Frontiers of physics 2018年第5期13卷 203-212页

作者： heng guo Jia-Yang Zhang Yong Zou Shu-Guang Guan Department of Physics East China Normal University Shanghai 200062 China

We propose the construction of cross and joint ordinal pattern transition networks from multivariate time series for two coupled systems, where synchronizations are often present. In particular, we focus on phase synchronization, which is a prototypical scenario in dynamical systems. We systematically show that cross and joint ordinal pattern transition networks are sensitive to phase synchronization. Furthermore, we find that some particular missing ordinal patterns play crucial roles in forming the detailed structures in the parameter space, whereas the calculations of permutation entropy measures often do not. We conclude that cross and joint ordinal partition transition network approaches provide complementary insights into the traditional symbolic analysis of synchronization transitions.

关键词： nonlinear time series analysis complex networks ordinal pattern partition transitionnetwork phase synchronization

Co-registered photoacoustic and ultrasound imaging for tongue cancer detection

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Journal of Innovative Optical Health Sciences 2018年第3期11卷 20-27页

作者： heng guo Weizhi Qi Ming He Jian Rong Lei Xi School of Physical Electronics University of Electronic Science and Technology of China ChengduSichuanP.R.China Center for Information in Biomedicine University of Electronic Science and Technology of China SichuanP.R.China

Tongue cancer is an increasingly common disease with high morbidity,Besides clinical obser-vation,biomedical imaging techniques have been investigated for early detection of *** this paper,we proposed a co-registered dual-modality photoacoustic(PA)and *** imaging technique to simultaneously map the functional and structural information ofhuman tongue,which has the potential to detect and diagnose tongue cancer in early stage,Theimaging probe comprises a 20-MHz side-view focused transducer for ultrasound imaging and PAdetection,a light path constructed by a multimode optical fiber,and a prism for PA *** experiments were conducted to evaluate the performance of the system includingpenetration depth,spatial resolution and signal-to-noise *** vivo imaging of animaltumor and human tongue was carried out to show the feasibility of the proposed technique todetect tumor lesions in human *** results of phantom and in vivo experiments suggestthat the proposed technique has the potential to detect the early-stage cancer lesions in humantongue.

关键词： Tongue cancer photoacoustic imaging multimodal imaging.

Knotted Solitons in an Interacting Mixture of a Charged and a Neutral Superfluid for Neutron Stars

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Communications in Theoretical Physics 2009年第9期52卷 555-560页

作者： REN Ji-Rong guo heng ZHANG Xin-Hui LI Ran Institute of Theoretical Physics Lanzhou University Lanzhou 730000 China

By making use of the decomposition of U（1） gauge potential theory and the C-mapping method we discuss a mixture of interacting neutral and charged Bose condensates, which is supposed being realized in the interior of neutron stars in the form of a coexistent neutron superfluid and protonic superconductor. We propose that this system possesses vortex lines and two classes of knotted solitons. The topological charge of the vortex lines are characterized by the Hopf indices and the Brower degrees of φ-mapping, and the knotted solitons are described by nontrivial Hopf invariant and the BF action respectively.

关键词： neutron stars topological excitations spontaneous breaking of gauge symmetries

Mechanism and threshold fluence of nanosecond pulsed laser paint removal

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Rare Metals 2022年第3期41卷 1022-1031页

作者： Qi Sun Jian-Zhong Zhou Xian-Kai Meng Jia-Nian Yang Zhao-heng guo Ming Zhu Shun guo School of Mechanical Engineering Jiangsu UniversityZhenjiang 212013China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China

In this paper, the nanosecond pulse laser surface treatment of the waterborne anti-rust paint on HT250 gray cast iron was carried out. The area and depth of the per-pulse laser ablation paint layer were measured. The threshold of laser energy density was determined through the relations with ablation area and depth. The paint removal mechanism was discussed by analyzing the ablation features of the paint layer on laser cleaning. The features of the paint removal under various laser energy densities were characterized, and the process parameters in the experiments were *** results showed that there were four thresholds and three kinds of mechanisms in the paint removal process with nanosecond pulsed laser. The ablation threshold of substrate was deepened on the laser parameters. The ablation processes were included thermal ablation, thermal vibration and paint ionization concurrently, respectively. The surface cracks and paint debris were observed at the edge of the cleaning path, which were ascribed to the vibration effect by laser. In addition, the vibration effect could significantly increase the width of paint removal. Paint ionization has also a significant influence on the substrate morphology. Paint ionization would have an obvious impact on the formation of the substrate morphology. It is desirable to fabricate approach to remove the paint layer without damaging the substrate under optimized laser parameters by nanosecond pulse laser.

关键词： Laser paint removal Threshold of energy density Paint removal mechanism Surface morphology