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Weatherability and heat resistance enhanced by interaction between AG25 and Mg/AI-LDH

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Rare Metals 2024年第6期43卷 2758-2768页

作者： Pei-Yao Yang Xiang-Cui Liu Yu-Chao Wang Huan-Ran zheng Jin-Xian Wang jia-yi zheng Meng-Jie Liu Dan-Ni Deng Yu Bai ying-Bi Chen Tong Zhang Zhi-Ming Liu Yong-Peng Lei State Key Laboratory of Powder Metallurgy Powder Metallurgy Research InstituteCentral South UniversityChangsha 410083China Research Institute of Chemical Defense Beijing 102205China

Although inorganic pigments in common spectral tuning materials show good weatherability and heat resistance,the limited color choices,weak coloring power,poor dispersibility,and a possibility of toxicity limit their *** the basis of organic pigments which possess a wide range of colors,high coloring power,good transparency,and high safety,herein,the modified pigment and biomimetic coating with improved weatherability,especially ultraviolet(UV)resistance(from 2 to 6 days),was achieved by intercalating acid green 25(AG25)pigment into Mg/Al-layered double hydroxides(Mg/Al-LDH).Furthermore,the heat resistance of AG25 was also significantly ***,the spectral stability of pigments after heat treatment is superior with almost unchanged spectral profile and green reflection *** formation of strong N-H bonds and the S-M(Mg,Al)bonds between Mg/Al-LDH laminates and AG25 molecules contributes to the *** work shows potential for biomimetic leaf materials in respect of reflective spectra stability.

关键词： Layered double hydroxide Biomimetic Acid green 25 Interaction Weatherability Heat resistance

A Quick Calculation Method for Radiation Pattern of Submillimeter Telescope with Deformation and Displacement

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Research in Astronomy and Astrophysics 2024年第3期24卷 249-265页

作者： jia You yi-Wei Yao zheng Wang School of Automation Southeast UniversityNanjing 210096China

Radiation pattern captures the electromagnetic performance of reflector antennas,which is significantly affected by the deformation of the primary reflector due to gravity and the displacement of the secondary *** the design process of large reflector antennas,a substantial amount of time is often dedicated to iteratively adjusting structural parameters and validating electromagnetic *** improve the efficiency of the design process,we first propose an approximate calculation method of optical path difference(OPD)for the deformation of the primary reflector under gravity and the displacement of the secondary *** an OPD fitting function based on the modified Zernike polynomials is proposed to capture the phase difference of radiation over the aperture plane,based on which the radiation pattern will be obtained quickly by the aperture field integration *** experiments demonstrate the effectiveness of the proposed quick calculation method for analyzing the radiation pattern of a 10.4 m submillimeter telescope antenna at its highest operating frequency of 856 *** comparison with the numerical simulation method based on GRASP(which is an antenna electromagnetic analysis tool combining physical optics(PO)and physical theory of diffraction(PTD)),the quick calculation method reduces the time for radiation pattern analysis from more than one hour to less than two ***,the quick calculation method exhibits excellent accuracy for the figure of merit(FOM)of the radiation ***,the proposed quick calculation method can obtain the radiation pattern with high speed and *** to the time-consuming numerical simulation method(PO and PTD),it can be employed for quick analysis of the radiation pattern for the lateral displacement of the secondary reflector and the deformation of the primary reflector under gravity in the design process of a reflector antenna.

关键词： instrumentation high angular resolution-methods data analysis-methods analytical

A Better Candidate for Dark Matter is Cosmic Plasma

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Research in Astronomy and Astrophysics 2023年第10期23卷 277-280页

作者： yi-jia zheng National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China

In the ΛCDM cosmological model, based on observations of supernovae Ia, the cosmic dark energy density is assumed to be Ω_(Λ)~ 0.70 and the gravitational mass density is assumed to be Ω_(m)~ 0.30. Based on the assumption that the observed cosmic microwave background(CMB) is a thermal relic of the early hot universe, the cosmic plasma density should be small, i.e., Ω_(b)~ 0.05(otherwise the Sunyaev-Zeldovich effect of the cosmic plasma would ruin the observed CMB's perfect blackbody spectrum). To fill the gap between Ω_(m) and Ω_(b), non-baryonic dark matter Ω_(c)~ 0.25 is introduced into the ΛCDM model. If the CMB is the result of a partial thermal equilibrium between cosmic radiation and cosmic plasma, then the observed perfect blackbody spectrum of the CMB can coexist with cosmic plasma. In this case, it is not necessary to introduce non-baryonic cold dark matter into cosmological models. A better candidate for dark matter is the cosmic plasma.

关键词： cosmology:theory (cosmology:)dark matter gravitational lensing:weak X-rays:galaxies:clusters

Effects of two silicone resin coatings on performance of FeSiAl magnetic powder cores

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Journal of Iron and Steel Research(International) 2024年第5期31卷 1279-1288页

作者： jia-qi Liu zheng-qu Zhu Pu Wang yi-fan Li Jing Pang jia-quan Zhang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China Qingdao Yunlu Advanced Materials Technology Co. Ltd.Qingdao266232ShandongChina

Two silicon resins with excellent thermal stability,JH1123 and JH7102,are used as the insulated agents and binders for the gas-atomized FeSiAl powder,and corresponding magnetic powder cores(MPCs)are *** insulation capability and application prospects of the two silicon resins are evaluated by comparing the magnetic properties of the coated powder and *** scanning electron microscopy,energy dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy results show that uniform insulation layers are both formed on the powder ***1123 has stronger binding ability,and the JH1123-coated powder exhibits severe agglomeration,with d50(average particle size)approximately twice that of the JH7102-coated *** as-prepared MPCs exhibit outstanding soft magnetic ***,the permeability of FeSiAl@JH1123 is up to 74.0,which is 35.5%higher than that of FeSiAl@JH7102 because JH1123 can further improve the density of the *** for FeSiAl@JH7102,it has better direct current bias and lower core loss of 716.9 mW cm^(−3) at 20 mT and 1000 kHz due to its lower coercivity and greater anti-magnetic saturation ability.A comprehensive comparison shows that FeSiAl@JH1123 is suitable for medium and high frequency applications,while FeSiAl@JH7102 is more suitable for high frequency *** indicates that the use of JH1123 and JH7102 silicon resins for binding and insulated coating not only simplifies the preparation process of MPCs,but also enables the controlled production of MPCs for different applications.

关键词： FeSiAl Insulated coating Magnetic powder core Permeability Core loss

Li-ion transport in solid-state electrolyte of Li_(1-x)Al_(1-x)Si_(2+x)O_(6):an ab initio study

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Rare Metals 2023年第7期42卷 2261-2271页

作者： Wen-Jun Li Modeste-Venin-Mendieev Nitou jia-yi zheng Zhi-Yuan Zhang Long-Fei Liu Jin-Lan Nie ying-Hua Niu Liang An Wei-Qiang Lv School of Physics University of Electronic Science and Technology of ChinaChengdu611731China Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou313001China Department of Mechanical Engineering the Hong Kong Polytechnic UniversityHong Kong999077China

All-solid-state batteries are considered as nextgeneration technology for energy storage due to their high energy density and excellent s ***,only a few solid electrolytes exhibit ionic conductivities comparable to liquid *** low-cost solid electrolytes with high Liion conductivity is in high *** on the ab initio molecular dynamic simulations,the Li^(+)diffusion inβ-LiAISi_(2)O_(6),a type of cost-effective and naturally-available mineral,and its disordered systems Li_(1-x)Al_(1-x)Si_(2+x)O_(6)with-1.0≤x≤0.5 was *** calculations show that the phases of Li_(1-x)Al_(1-x)Si_(2+x)O_(6)with nonzero x all possess much lower diffusion energy barriers than pristine LiAlSi_(2)O_(6).When x is positive,increased concentration of lithium vacancies accelerates the diffusion of *** x is negative,additional Li-ions are inserted into structures and co-migration is stimulated among these *** particular,the maximal ionic conductivity at 300 K(1.92×10^(-6)S·cm^(-1))is obtained in Li_(2)Al_(2)SiO_(6)(x=-1.0),which is five orders of magnitude larger than that of pristineβ-LiAlSi_(2)O_(6).In addition,the diffusion barrier can be further reduced to 0.38 eV by replacing Si with Ge,and the ionic conductivity for Li_(2)Al_(2)GeO_(6)can reach 3.08×10~(-5)S·cm^(-1)at 300 *** work facilitates the understanding of Li+conduction mechanisms in silicatebased electrolytes and the development of cost-effective and high-performance solid-s ate electrolytes.

关键词： Ionic conductivity Diffusion barrier Solid-state electrolyte(SSE) Ab initio molecular dynamics

6DOF pose estimation of a 3D rigid object based on edge-enhanced point pair features

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Computational Visual Media 2024年第1期10卷 61-77页

作者： Chenyi Liu Fei Chen Lu Deng Renjiao yi Lintao zheng Chenyang Zhu jia Wang Kai Xu College of Computing National University of Defense TechnologyChangsha410073China Department of Spine Surgery the Second Xiangya HospitalCentral South UniversityChangsha410011China Clinical Nursing Teaching and Research Section the Second Xiangya HospitalChangsha410011China College of Meteorology and Oceanography National University of Defense TechnologyChangsha410073China Beijing Institute of Tracking and Communication Technology Beijing100094China

The point pair feature(PPF)is widely used for 6D pose *** this paper,we propose an efficient 6D pose estimation method based on the PPF *** introduce a well-targeted down-sampling strategy that focuses on edge areas for efficient feature extraction for complex geometry.A pose hypothesis validation approach is proposed to resolve ambiguity due to symmetry by calculating the edge matching *** perform evaluations on two challenging datasets and one real-world collected dataset,demonstrating the superiority of our method for pose estimation for geometrically complex,occluded,symmetrical *** further validate our method by applying it to simulated punctures.

关键词： point pair feature(PPF) pose estimation object recognition 3D point cloud

Undrained anisotropy and non-coaxial behavior of clayey soil under principal stress rotation

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2014年第4期15卷 241-254页

作者： jian ZHOU jia-jia YAN zheng-yi LIU Xiao-nan GONG Research Center of Coastal and Urban Geotechnical Engineering Zhejiang University Hangzhou 310058 China

研究目的:研究主应力轴旋转条件下粘土的非共轴塑性流动规律和内在机理,并分析土体初始各向异性、中主应力系数、剪应力水平等对非共轴塑性流动特性的影响。创新要点:对主应力轴旋转条件下粘土塑性应变增量方向的规律和内在机理及影响... 详细信息

研究目的:研究主应力轴旋转条件下粘土的非共轴塑性流动规律和内在机理,并分析土体初始各向异性、中主应力系数、剪应力水平等对非共轴塑性流动特性的影响。创新要点:对主应力轴旋转条件下粘土塑性应变增量方向的规律和内在机理及影响因素进行分析,为考虑主应力轴旋转影响的粘土本构模型的建立提供了试验依据。研究方法:通过对比试验,研究原状粘土和重塑粘土的非共轴塑性流动特性,对非共轴塑性流动的规律和内在机理及影响因素进行分析。重要结论:主应力旋转剪切条件下,粘土的塑性主应变增量方向与主应力方向存在显著差异。非共轴特性不完全取决于土体的各向异性特性,受应力路径的影响也较大。

关键词：主应力轴旋转各向异性同轴度不排水行为粘性土主应力方向中间主应力

Icariin accelerates bone regeneration by inducing osteogenesisangiogenesis coupling in rats with type 1 diabetes mellitus

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World Journal of Diabetes 2024年第4期15卷 769-782页

作者： Sheng zheng Guan-Yu Hu Jun-Hua Li jia zheng yi-Kai Li Department of Traditional Chinese Orthopedics and Traumatology Center for Orthopedic SurgeryThe Third Affiliated Hospital of Southern Medical UniversityGuangzhou 510630Guangdong ProvinceChina School of Traditional Chinese Medicine Southern Medical UniversityGuangzhou 510515Guangdong ProvinceChina Department of Endocrinology Peking University First HospitalBeijing 100034China

BACKGROUND Icariin(ICA),a natural flavonoid compound monomer,has multiple pharmacological ***,its effect on bone defect in the context of type 1 diabetes mellitus(T1DM)has not yet been *** To explore the role and potential mechanism of ICA on bone defect in the context of *** The effects of ICA on osteogenesis and angiogenesis were evaluated by alkaline phosphatase staining,alizarin red S staining,quantitative real-time polymerase chain reaction,Western blot,and ***-related assays were conducted to investigate the relationship between osteogenesis and angiogenesis.A bone defect model was established in T1DM *** model rats were then treated with ICA or placebo and micron-scale computed tomography,histomorphometry,histology,and sequential fluorescent labeling were used to evaluate the effect of ICA on bone formation in the defect *** ICA promoted bone marrow mesenchymal stem cell(BMSC)proliferation and osteogenic *** ICA treated-BMSCs showed higher expression levels of osteogenesis-related markers(alkaline phosphatase and osteocalcin)and angiogenesis-related markers(vascular endothelial growth factor A and platelet endothelial cell adhesion molecule 1)compared to the untreated *** was also found to induce osteogenesis-angiogenesis coupling of *** the bone defect model T1DM rats,ICA facilitated bone formation and CD31hiEMCNhi type H-positive capillary ***,ICA effectively accelerated the rate of bone formation in the defect *** ICA was able to accelerate bone regeneration in a T1DM rat model by inducing osteogenesis-angiogenesis coupling of BMSCs.

关键词： Icariin Osteogenesis-angiogenesis coupling Type 1 diabetes mellitus Bone defect Bone regeneration

Fermi level tuning in Sn_(1-x)Pb_(x)Te/Pb heterostructure via changing interface roughness

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Science China(Physics,Mechanics & Astronomy) 2024年第8期67卷 118-125页

作者： Tengteng Liu Zhaoxia yi Bangjin Xie Weiyan zheng Dandan Guan Shiyong Wang Hao zheng Canhua Liu Hao Yang Yaoyi Li Jinfeng jia Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education) Tsung-Dao Lee InstituteSchool of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Shanghai 201315China Hefei National Laboratory Hefei 230088China

Superconducting SnTe-type topological crystalline insulators(TCIs)are predicted to host multiple Majorana zero modes(MZMs)which can coexist in a single *** level(FL)close to the Dirac points of topological surface states is helpful for detecting ***,the TCI SnTe is a heavily p-type semiconductor which is very difficult to modify to n-type via doping or *** this work,we fabricate the atomically flat Sn_(1-x)Pb_(x)Te/Pb heterostructure by molecular beam epitaxy,and make the p-type Sn_(1-x)Pb_(x)Te become n-type through changing the interface *** scanning tunnelling microscope,we find the Dirac points of Sn_(1-x)Pb_(x)Te/Pb heterostructure are always above the FL due to the Fermi level pinning(FLP)induced by topological surface states at atomically flat *** increasing the interface roughness,the FLP effect is suppressed and then the Dirac points of p-type Sn_(1-x)Pb_(x)Te can be tuned very close to or even below the *** work provides a new method for tuning the FL of SnTe-type TCI which has potential application in novel topological superconductor device.

关键词： topological crystalline insulator superconductor heterostructure Fermi level pinning interface roughness