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Momentum Space Quantum Monte Carlo on Twisted Bilayer Graphene

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Chinese Physics Letters 2021年第7期38卷 130-135页

作者： Xu Zhang Gaopei pan Yi Zhang Jian Kang Zi Yang Meng Department of Physics and HKU-UCAS Joint Institute of Theoretical and Computational Physics The University of Hong KongPokfulam RoadHong Kong SARChina Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Kavli Institute for Theoretical Sciences University of Chinese Academy of SciencesBeijing 100190China School of Physical Science and Technology and Institute for Advanced Study Soochow UniversitySuzhou 215006China

We report an implementation of the momentum space quantum Monte Carlo(QMC)method on the interaction model for the twisted bilayer graphene(TBG).The long-range Coulomb repulsion is treated exactly with the flat bands,spin and valley degrees of freedom of electrons taking into *** prove the absence of the minus sign problem for QMC simulation when either the two valleys or the two spin degrees of freedom are *** taking the realistic parameters of the twist angle and interlayer tunnelings into the simulation,we benchmark the QMC data with the exact band gap obtained at the chiral limit,to reveal the insulating ground states at the charge neutrality point(CNP).Then,with the exact Green's functions from QMC,we perform stochastic analytic continuation to obtain the first set of single-particle spectral function for the TBG model at *** momentum space QMC scheme therefore offers the controlled computation pathway for systematic investigation of the electronic states in realistic TBG model at various electron fillings.

关键词： momentum exact twisted

Ultrasound-triggered release of sinoporphyrin sodium from liposome-microbubble complexes and its enhanced sonodynamic toxicity in breast cancer

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Nano Research 2018年第2期11卷 1038-1056页

作者： Yixiang Li Huanxiao An Xiaobing Wang pan Wang Fei Qu Yan Jiao Kun Zhang Quanhong Liu Ministry of Education Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry National Engineering Laboratory for Resource Developing of Endangered Chinese Crude Drugs in Northwest of China College of Life Sciences Shaanxi Normal University Xi’an China

Applying ultrasound （US） to drug delivery and disease therapy is important work. Sonodynamic therapy （SDT）-a comprehensive therapy using US and a sonosensitizer-exhibits antineoplasfic activity in many tumors. In this stud）5 we investigated the feasibility of using a new sonosensitizer （sinoporphyrin sodium, DVDMS） loaded into liposome-microbubble complexes （DLMBs） as a possible candidate to enhance SDT against breast cancer. DLMBs were synthesized via the biofin-avidin linkage and confirmed to have good US response. US-induced cavitation played a key role to trigger a boosted payload release from DLMBs and improve the cellular uptake and intratumoral diffusion of DVDMS to realize better SDT effect. The combination of DLMBs and US treatment resulted in significant changes to cell morpholog34 mitochondria damage, and cell apoptosis in vitro. In vivo, the combined treatment markedly inhibited tumor growth, which appeared to result from increased apoptosis and reduced proliferation activity. The significant increase in the antitumor effect of DLMBs plus US suggests their potential use as a new approach to promote the killing activity of SDT against breast cancer.

关键词： ultrasound microbubble sinoporphyrin sodium sonodynamic therapy

A DESCRIPTION METHOD FOR ARBITRARILY SHAPED AND SIZED GRANULES IN 2D IMAGE

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Journal of Electronics(China) 2009年第3期26卷 423-427页

作者： Chen Ken Zhao pan Zhao Xuemei College of Information Science and Engineering Ningbo University Ningbo 315211 China

An alternative method is proposed in this letter for describing the arbitrary shape and size for granules in 2D *** image binarization, the edge points on contour are detected, by which the centroid of the shape in question is sought using the moment *** Principal Component Analysis(PCA), the major and minor diameters are *** on the signature curve-fitting, the first-order derivative is taken so as to seek all the characteristic *** connecting the vertices found, the simplified polygon is formed and utilized for shape and size descriptive *** developed algorithm is run on two given real particle images, and the execution results indicate that the computed parameters can technically well describe the shape and size for the original particles, being able to provide a ready-to-use database for machine vision system to perform related data processing tasks.

关键词： Particle shape and size Granule image Shape descriptor Principal Component Analysis(PCA) Machine vision

Minimal axiom group of similarity-based rough set model

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Frontiers of Electrical and Electronic Engineering in China 2006年第3期1卷 255-258页

作者： DAI Jian-hua pan Yun-he Institute of Artificial Intelligence Zhejiang UniversityHangzhou 310027China

Rough set axiomatization is one aspect of rough set study to characterize rough set theory using dependable and minimal axiom ***,rough set theory can be studied by logic and axiom system *** classical rough set theory is based on equivalence relation,but the rough set theory based on similarity relation has wide ap-plications in the real *** characterize similarity-based rough set theory,an axiom group named S,consisting of 3 axioms,is *** reliability of the axiom group,which shows that characterizing of rough set theory based on similarity relation is rational,is ***,the minimization of the axiom group,which requests that each axiom is an equation and independent,is *** axiom group is helpful to research rough set theory by logic and axiom system methods.

关键词： rough set theory axioms minimization

Strawberry vein banding virus P6 protein intracellular transport and an important domain identification

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Journal of Integrative Agriculture 2018年第9期17卷 2031-2041页

作者： pan Yuan ZHOU Xiu-hong LI Shuai FENG Ming-feng SHI Man-ling ZUO Deng-pan JIANG Xi-zi CHEN Jing HU Ya-hui ZHANG Xiang-xiang JIANG Tong School of Plant Protection Anhui Agricultural University Biotechnology Center Anhui Agricultural University College of Life and Environmental Sciences Hangzhou Normal University

Strawberry vein banding virus （SVBV）-infected strawberry cells contain cytoplasmic inclusions with isometric particles. To identify the components of the inclusions, green fluorescent protein （GFP） was fused to the carboxy-terminus （C-terminus） of SVBV open reading frames, these constructs were separately transformed into Agrobacterium tumefaciens and infiltrated into Nicotiana benthamiana leaves. Results showed that the SVBV P6 protein assembled into prominent and amorphous inclusion bodies （IBs）. To investigate P6 subcellular localization, P6-GFP was ectopically expressed in N. benthamiana leaves by agroinfiltration and then stained with 4＂,6-diamidino-2-phenylindole （DAPI）. We found the P6 protein accumulated in the nuclei and also formed cytoplasmic IBs with different sizes. To further determine the location of P6 IBs in the cytoplasm, and explore whether the P6 IBs move freely or depend on cytoskeleton and endoplasmic reticulum （ER）, the microfilament marker protein （GFP-ABD2-GFP）, microtubules marker protein （mCherry-MAP65-1） and ER marker protein （mCherry-HDEL） were separately coexpressed with P6-GFP and into N. benthamiana leaves by agroinfiltration, exhibiting that P6 IBs aligned with cytoskeleton and endoplasmic reticulum. Meanwhile, coinfiltration of P1 and P6 indicated the P6 colocalized with the P1 protein at periphery of cells. The P6 protein contains one C-terminal nuclear localization signal （NLS） region, a P6 protein mutant with a deleted NLS did not localize in the nucleus, did not form IBs, and was unable to facilitate exogenous GFP expression. These results demonstrate that the deleted NLS region is an important P6 domain required for biological functions. In summary, the mobile P6 IBs are associated with ER, microfilaments and microtubules and move along microfilaments to the SVBV P1 protein in the PD.

关键词： SVBV IBs intracellular transport cytoskeleton ER P6 mutant

Removal of formaldehyde over Mn_xCe_(1- x)O_2 catalysts: Thermal catalytic oxidation versus ozone catalytic oxidation

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Journal of Environmental Sciences 2014年第12期26卷 2546-2553页

作者： Jia Wei Li Kuan Lun pan Sheng Jen Yu Shaw Yi Yan Moo Been Chang Graduate Institute of Environmental Engineering National Central University Industrial Technology Research Institute

MnxCe1- xO2（x： 0.3–0.9） prepared by Pechini method was used as a catalyst for the thermal catalytic oxidation of formaldehyde（HCHO）. At x = 0.3 and 0.5, most of the manganese was incorporated in the fluorite structure of Ce O2 to form a solid solution. The catalytic activity was best at x = 0.5, at which the temperature of 100% removal rate is the lowest（270°C）. The temperature for 100% removal of HCHO oxidation is reduced by approximately 40°C by loading 5 wt.% Cu Oxinto Mn0.5Ce0.5O2. With ozone catalytic oxidation, HCHO（61 ppm） in gas stream was completely oxidized by adding 506 ppm O3 over Mn0.5Ce0.5O2 catalyst with a GHSV（gas hourly space velocity） of 10,000 hr-1at 25°C. The effect of the molar ratio of O3 to HCHO was also investigated. As O3/HCHO ratio was increased from 3 to 8, the removal efficiency of HCHO was increased from 83.3% to 100%. With O3/HCHO ratio of 8, the mineralization efficiency of HCHO to CO2 was 86.1%. At 25°C, the p-type oxide semiconductor（Mn0.5Ce0.5O2） exhibited an excellent ozone decomposition efficiency of 99.2%,which significantly exceeded that of n-type oxide semiconductors such as Ti O2, which had a low ozone decomposition efficiency（9.81%）. At a GHSV of 10,000 hr-1, [O3]/[HCHO] = 3 and temperature of 25°C, a high HCHO removal efficiency（≥ 81.2%） was maintained throughout the durability test of 80 hr, indicating the long-term stability of the catalyst for HCHO removal.

关键词： Formaldehyde Volatile organic compounds Indoor air pollutant Thermal catalytic oxidation Ozone catalytic oxidation

Facile and Large-scale Fabrication of Self-crimping Elastic Fibers for Large Strain Sensors

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Chinese Journal of Polymer Science 2021年第7期39卷 914-924页

作者： Jin-Chao Yu Kang Chen Hong Ji Yang Zhang Yu-Mei Zhang Zhi-Juan pan College of Textile and Clothing Engineering Soochow UniversitySuzhou 215123China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Stretchable conductive fibers offer unparalleled advantages in the development of wearable strain sensors for smart textiles due to their excellent flexibility and ***,the practical applications of these fibers in wearable devices are hindered by either contradictory properties of conductive fibers(high stretchability versus high sensing stability),or lack of manufacturing ***,we present a facile approach for highly stretchable self-crimping fiber strain sensors based on a polyether-ester(TPEE)elastomer matrix using a side-by-side bicomponent melt-spinning process involving two parallel but attached components with different shrinkage *** TPEE component serves as a highly elastic mechanical support layer within the bicomponent fibers,while the conductive component(E-TPEE)of carbon black(CB),multiwalled carbon nanotubes(MWCNTs)and TPEE works as a strain-sensitive *** addition to the intrinsic elasticity of the matrix,theTPEE/E-TPEE bicomponent fibers present an excellent form of elasticity due to *** self-crimping elongation of the fibers can provide a large deformation,and after the crimp disappears,the intrinsic elastic deformation is responsible for monitoring the strain *** reliable strain sensing range of theTPEE/E-TPEE composite fibers was 160%-270%and could be regulated by adjusting the crimp *** importantly,the TPEE/E-TPEE fibers had a diameter of 30-40 pm and tenacity of 40-50 MPa,showing the necessary *** work introduces new possibilities for fiber strain sensors produced in standard industrial spinning machines.

关键词： Conductive polyether-ester elastic fiber Side-by-side bicomponent fiber Self-crimping Strain sensing

Parameters determination and bolting control of gateway floor

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Journal of Coal Science & Engineering(China) 2011年第4期17卷 388-392页

作者： GOU pan-feng XIN Ya-jun School of Energy Science and Engineering Henan Polytechnic University Jiaozuo 454000 China

Gateway floor heave control is the key to guarantee mine safe and efficient production. Through analysis of floor instability characteristics and bolting control, gateway floor strata show second level stress under abutment pressure, which causes plastic flow failure in floor strata; gateway floor instability shows mainly shear-break slippage of ＂triangle sliding body＂. Mechanics of floor bolting is mainly a function of connection and combination. Main area of bolting control lies in two gateway floor angles. The paper analyzes mechanics principle of gateway floor instability, constructs stability mechanics model of gateway floor bolting, obtains gateway floor stability criterion of different bolting angles and optimum formula of bolting parameters, carries out the engineering example, and guides better field application. It provides theoretical base for bolting gateway floor instability control.

关键词： parameter determination bolting gateway floor heave mechanical model judge criterion

Hot roll bonding between commercially pure titanium and high-strength low-alloy steel using Fe interlayer

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Journal of Iron and Steel Research International 2019年第10期26卷 1126-1136页

作者： Xi-yang Chai Gang Chen Feng Chai Tao pan Zhi-gang Yang Cai-fu Yang Department of Structural Steel Central Iron and Steel Research InstituteBeijing 100081China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

Hot roll bonding was carried out between commercially pure titanium TA2 and high-strength low-alloy steel Q390 using no interlayer and Fe interlayer at temperatures of 850,900,950 and 1000℃with a total reduction ratio of 86.7%.Interfacial microstructure and bonding property of clad plates were investigated by electron microscopy and shear *** results showed that with the increase in heating temperature,the shear strength of titanium clad steel plates decreases *** with that of titanium clad steel plates with no interlayer,inserting Fe interlayer between titanium and steel can improve the shear strength at 850 and 900℃but deteriorate the shear strength at 950 and 1000℃.The reason for this consequence was that Fe interlayer prevented the reaction diffusion of C in titanium to form a thinner TiC layer at 850 and 900℃,while Fe interlayer promoted the reaction diffusion of Fe in titanium to generate thicker Fe2Ti and FeTi intermetallic compound layers at 950 and 1000℃.

关键词： Titanium clad steel plate Fe interlayer TiC Intermetallic compound Hot roll bonding