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Decoherence of a Double Quantum Dot Charge Qubit Approached with Redfield Equation

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Communications in Theoretical Physics 2009年第2期51卷 345-348页

作者： li Zeng-zhao li Zhi-Qiang Department of Physics and Institute of Modern Physics Ningbo University Ningbo 315211 China

In this paper, we investigate the decoherence time of a double quantum dot （DQD） charge qubit in three kinds of baths through solving dynamics of the qubit. The dynamics of the qubit is investigated with Redfield master equation. It is shown that the decoherence time of the qubit in Ohmic bath has the same order of magnitude as the experiments reported. When the environment is modeled with the supra-Ohmic bath the decoherence time of the qubit is shorter than the experimental result. And when modeled with the sub-Ohmic bath the decoherence time of the qubit is longer than the experimental result.

关键词： quantum dot decoherence redfield equation

Sphericities of non-spherical objects

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Particuology 2012年第1期10卷 97-104页

作者： Teng li Shuixiang li Jian zhao Peng Lu lingyi Meng Department of Mechanics ＆Aerospace Engineering College of Engineering Peking University Beijing 100871 China

Sphericity, as one of the most important shape parameter for non-spherical objects, is extensively applied in evaluating the porosity or packing density of particles. In this paper, the sphericities of common non- spherical objects are deduced and investigated. Maximum sphericities and optimum shapes of these objects are presented as well. A decreasing order of sphericity from sphere （1.0） to regular tetrahedron （0.671） for objects with constant sphericity is given. Similar trends are found in most sphericity-aspect ratio relationships, which exhibit single Peak and the sphericity increases with the growth of aspect ratio before the peak point and decreases afterward. The peak loci of aspect ratio are all around 1.0 which makes the shape approaching to a sphere. The information in the paper could be useful as literature for general application.

关键词： SphericityAspect ratioNon-spherical particleOptimum shape

MG63 Osteoblast-like Cells Growth Behaviour on Carbon/Carbon Composites with Different Carbon Matrixes

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Chinese Journal of Mechanical Engineering 2011年第2期24卷 303-308页

作者： ZHANG Leilei li Hejun li Kezhi zhao Xueni WU Heng CAO Sheng State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi ＇an 710072 China

During the process that implant materials are used for bone replacement,the cell responses to implant materials determine the long-term stability of bone *** microstructure of implant materials is considered as a critical factor that influences the cell ***/Carbon composites（C/C composites） are novel implant materials,but there are few reports on the effect of their microstructure,especially the carbon matrixes and holes,on cell *** this paper,C/C composites with different carbon matrixes are prepared by chemical vapor infiltration and pressure impregnation carbonization technique,*** structure of holes is *** cell responses to C/C composites with different carbon matrixes are evaluated with MG63 osteoblast-like *** morphologies of MG63 osteoblast-like cells on the surface of C/C composites,especially in the holes are assessed by scanning electron microscope,and cell proliferation behavior is evaluated by 3-[4,5-dimethylthiozol-2-yl]-2,5-diphenyltetrazolium bromide（MTT） assay. The results show that MG63 osteoblast-like cells have a lamellar morphology with similar sizes and spreading areas as well as the same proliferation behaviors for C/C composites with different carbon *** matrix shows unapparent influence on the cell growth ***,MG63 osteoblast-like cells have various interactions with the holes of C/C *** cells stride over the holes with 6～8μm in size,and connect with each other or grow along the curvature wall of the holes with a size of 30-40μm;the cells present three-dimensional morphologies inside the holes and display circular shapes along the ridge of the *** cell-material interactions are found according to the size and position of the holes,which provides theoretical foundation for the microstructure design of clinical C/C composites.

关键词： Carbon/Carbon composite matrix osteoblast growth behavior microstructure

Orientation controlled photogenerated carriers on selfsupporting CdS/Ni_(3)S_(2) paper toward photocatalytic hydrogen evolution and biomass upgrading

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Rare Metals 2024年第5期43卷 2015-2025页

作者： Xiao-Yan liu Qing Cao Gui-Xiang li Hui liu li-li Zeng li-li zhao Bin Chang Xi-Wen Wang Hong liu Wei-Jia Zhou Institute for Advanced Interdisciplinary Research School of Chemistry and Chemical EngineeringUniversity of JinanJinan 250022China Institute of Chemical Sciences and Engineering Ecole Polytechnique Federale de Lausanne1015LausanneSwitzerland KAUST Catalysis Center King Abdullah University of Science and TechnologyThuwal 23955-6900Kingdom of Saudi Arabia School of Environment and Energy South China University of TechnologyGuangzhou Higher Education Mega CenterGuangzhou 510006China State Key Laboratory of Crystal Materials Shandong UniversityJinan250100China School of Mechanical Engineering Xi'an Jiaotong UniversityXi'an 710054China

The appropriate regulation of band structure is an effective strategy in constructing efficient photocatalytic *** photocatalytic system mainly employs powder photocatalysts,which makes their recovery reliant on expensive separation processes and severely limits their industrial ***,we constructed a novel CdS/Ni_(3)S_(2)heterostructure using free-standing and flexible nickel fiber paper as the *** regulated energy band structure achieves effective electron–hole *** as-synthesized flexible photocatalyst exhibits considerable photocatalytic activity toward the H_(2)evolution reaction under visible-light irradiation,with an H_(2)production rate of5.63μmol·cm^(-2)·h^(-1)(14.1 mmol·g^(-1)cat·h^(-1)according to the catalyst loading content).Additionally,the otherwisewasted excited holes simultaneously drive organic transformations to yield value-added organic products,thus markedly improving the photocatalytic H_(2)evolution *** a photocatalytic system is scaled up further,where a self-supported 20 cm×25 cm sample achieves a champion H_(2)production rate of 60-80μmol·h^(-1)under practical sun *** newly developed self-supported photocatalyst produces opportunities for practical solar H2production with biomass upgrading.

关键词： Self-supporting photocatalyst CdS/Ni_(3)S_(2) heterojunction Hydrogen evolution Biomass upgrading Large-scaleapplication

Silencing the enhancer of zeste homologue 2,Ezh2,represses axon regeneration of dorsal root ganglion neurons

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Neural Regeneration Research 2022年第7期17卷 1518-1525页

作者： Ting-Ting Guo Ying zhao Wei-Xiao Huang Tao Zhang li-li zhao Xiao-Song Gu Song-lin Zhou Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology ProductsJiangsu Clinical Medicine Center of Tissue Engineering and Nerve Injury RepairCo-Innovation Center of NeuroregenerationNantong UniversityNantongJiangsu ProvinceChina Model Animal Research Center and MOE Key Laboratory of Animal Models of Disease Nanjing UniversityNanjingJiangsu ProvinceChina

Recovery from injury to the peripheral nervous system is different from that of the central nervous system in that it can lead to gene reprogramming that can induce the expression of a series of regeneration-associated *** eventually leads to axonal regeneration of injured *** some regeneration-related genes have been identified,the regulatory network underlying axon regeneration remains largely *** explore the regulator of axon regeneration,we performed RNA sequencing of lumbar L4 and L5 dorsal root ganglion(DRG)neurons at different time points(0,3,6,12 hours,1,3 and 7 days)after rat sciatic nerve *** isolation of neurons was carried out by laser capture microscopy combined with NeuN immunofluorescence *** found 1228 differentially expressed genes in the injured sciatic nerve *** hub genes within these differentially expressed genes include Atf3,Jun,Myc,Ngf,Fgf2,Ezh2,Gfap and *** verified that the expression of the enhancer of zeste homologue 2 gene(Ezh2)was up-regulated in DRG neurons after injury,and this up-regulation differed between large-and small-sized dorsal root ganglion *** investigate whether the up-regulation of Ezh2 impacts axonal regeneration,we silenced Ezh2 with siRNA in cultured DRG neurons and found that the growth of the newborn axons was *** our investigation into the regulatory network of Ezh2 by interpretive phenomenal analysis,we found some regulators of Ezh2(including Erk,Il6 and Hif1a)and targets(including Atf3,Cdkn1a and Smad1).Our findings suggest that Ezh2,as a nerve regeneration-related gene,participates in the repair of the injured DRG neurons,and knocking down the Ezh2 in vitro inhibits the axonal growth of DRG *** the experimental procedures approved by the Administration Committee of Experimental Animals of Jiangsu Province of China(approval No.S20191201-201)on March 21,2019.

关键词： axon regeneration dorsal root ganglion neurons Ezh2 IB4 laser capture microscopy NF160/200 quantitative reverse transcription-polymerase chain reaction sciatic nerve crush scRNA-seq siRNA

Transcriptional regulatory network during axonal regeneration of dorsal root ganglion neurons:laser-capture microdissection and deep sequencing

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Neural Regeneration Research 2023年第9期18卷 2056-2066页

作者： li-li zhao Tao Zhang Wei-Xiao Huang Ting-Ting Guo Xiao-Song Gu Model Animal Research Center and MOE Key Laboratory of Animal Models of Disease Nanjing UniversityNanjingJiangsu ProvinceChina Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education Co-innovation Center of NeuroregenerationNantong UniversityNantongJiangsu ProvinceChina School of Medicine and life Sciences Nanjing University of Chinese MedicineNanjingJiangsu ProvinceChina

The key regulators and regeneration-associated genes involved in axonal regeneration of neurons after injury have not been *** high-throughput sequencing,various factors influence the final sequencing results,including the number and size of cells,the depth of sequencing,and the method of cell *** is still a lack of research on the detailed molecular expression profile during the regeneration of dorsal root ganglion neuron *** this study,we performed lase r-capture microdissection coupled with RNA sequencing on dorsal root ganglion neurons at 0,3,6,and 12 hours and 1,3,and 7 days after sciatic nerve crush in *** identified three stages after dorsal root ganglion injury:early(3-12 hours),pre-regeneration(1 day),and regeneration(3-7 days).Gene expression patterns and related function enrichment res ults showed that one module of genes was highly related to axonal *** verified the up-regulation of activating transcription factor 3(Atf3),Kruppel like factor 6(Klf6),AT-rich inte raction domain 5A(Arid5α),CAMP responsive element modulator(Crem),and FOS like 1,AP-1 transcription factor Subunit(Fosl1) in dorsal root ganglion neurons after *** these transcription factors(Crem,Arid5o,Fosl1 and Klf6) reduced axonal regrowth in *** the hub transcription factor,Atf3 showed higher expression and activity at the preregeneration and regeneration stages.G protein-coupled estrogen receptor 1(Gper1),inte rleukin 12a(Il12α),estrogen receptor 1(ESR1),and interleukin 6(IL6) may be upstream factors that trigger the activation of Atf3 during the repair of axon injury in the early *** study presents the detailed molecular expression profile during axonal regeneration of dorsal root ganglion neurons after peripheral nerve *** findings may provide reference for the clinical screening of molecular targets for the treatment of peripheral nerve injury.

关键词： Arid5a Atf3 Crem dorsal root ganglion Fosl1 Klf6 laser-capture microdissection neuron smart-seq2 gene expression profile transcription factor

Serrated flow behavior of GH536 superalloy under different loading rates at room temperature

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Rare Metals 2024年第5期43卷 2317-2323页

作者： Wen-Xiang Gao Dong Ma li-li zhao Fan Ye ling Shao Su-Jun Wu School of Materials Science and Technology Beihang UniversityBeijing100091China

Serrated flow phenomenon has been widely observed among different metals due to the potential influence on their *** tensile tests of nickel-based superalloy GH536 were carried out at loading rates of 0.06,0.60,3.60,and 36.00 mm·min^(-1)at room temperature,*** tensile stress-strain curves demonstrate repetitive and discontinuous yielding behavior,namely serrated *** is observed that the stress-strain curves were dominated by type B serration,and original annealing twin boundaries(TBs)were distorted to various degrees under comparatively different lower tensile *** contrast,the TBs almost disappear,and the type B serrations become smoother and regular under the higher loading *** phenomenon can be attributed to the interactions between TBs and dislocations during tensile *** effects of the mobile and immobile dislocations illustrate the unsteady amplitude of serrations observed in stress-strain *** electron microscope images of tested pieces reveal the interaction of dislocation and TB,with dislocation tangling around the TBs.

关键词： Nickel-based superalloy Serrations Twin boundaries Deformation mechanism

Ace2, rather than ace1, is the major acetylcholinesterase in the silkworm, Bombyx moil

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Insect Science 2009年第4期16卷 297-303页

作者： Hui-Juan Chen Zhen liao Xiao-Ming Hui Guo-Qing li Fei li zhao-Jun Han Department of Entomology Nanjing Agricultural University Nanjing China

Two acetylcholinesterase （ace） genes have been reported in many insect species. In pests such as Helicoverpa assulta and Plutella xylostellas, acel gene encodes the predominant synaptic enzyme that is the main target of organophosphorus （OP） and carbamate pesticides. It has been reported that pesticide selection has an impact on the ace gene evolution. The domesticated silkworm, Bombyx mori, also has two ace genes. We studied ace gene expression and enzyme activities in silkworm as this has not faced pesticide selection over the past decades. The expression levels of two ace genes, Bm-acel and Bm-ace2, were estimated by quantitative real-time polymerase chain reaction. Bin-ace2 was expressed more highly than Bm-acel in all tested samples of different developmental stages or tissues, suggesting ace2, rather than acel, is the major type ofacetylcholinesterase （ACHE） in Bombyx mori. This is inconsistent with the aforementioned lepidopterons agricultural pests, partly be due to the widespread use of pesticides that may induce high expression of the acel gene in these pests. Besides high expression in the head, Bm-acel also expresses highly in the silk glands and Bm-ace2 is abundant in the germline, implying both ace genes may have potential non-hydrolytic roles in development. Furthermore, we found that the mRNA levels of two ace genes and their ratios （ace2/acel） change day to day in the first and third instars. This challenges the conventional method of estimating enzymatic activity using crude extract as an enzyme solution, as it is a mixture of ACHE 1 and ACHE2. An efficient and simple method for separating different ACHEs is necessary for reliable toxicological analyses.

关键词： acetylcholinesterase Bombyx mori expression Kin quantitative real-time polymerase chain reaction (qRT-PCR)

Synthesis of high quality type-Ib diamond crystals in carats grade

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Chinese Science Bulletin 2010年第14期55卷 1372-1375页

作者： XIAO HongYu JIA XiaoPeng MA HongAn li ShangSheng li Yong zhao Ming State Key Laboratory of Superhard Materials Jilin University Changchun 130012 China

High quality type-Ib tower-shape gem-diamond crystals in carats grade were synthesized in cubic anvil high pressure apparatus (SPD-6×1200) at 5.4 GPa and 1250-1450°C. The relationship between the growth time and the weight of growth diamond has been gained. The faces of {110} and {113} were found in the synthetic diamond crystals frequently. We found that the relative growth rate of {113} face was descending with the increase of growth temperature, and that of {110} face had no obvious change with the increase of the growth temperatures and the growth time. In the work, the crystal defects were studied carefully, and the reasons for the appearance of the defects were also obtained. Some diamond crystals have been polished into the anvil of DAC (Diamond Anvil Cell) and the diamond jewelry. Compared with natural diamond crystal, synthetic diamond crystal has the merits such as small grinding quantity, low cost, etc., so it can be widely used in super high pressure field and gemstone industry.

关键词：宝石级金刚石单晶合成克拉金刚石晶体质型经济增长生长温度钻石首饰