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Electrodeposition and Characterization of Ni/Ti_3Si(Al)C_2 Composite Coatings

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Journal of Materials Science & Technology 2011年第11期27卷 1016-1024页

作者： Ying Liang Mingyue liu Jixin Chen xiaoxia liu Yanchun Zhou Department of Chemistry Northeastern University Shenyang 110819 China Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Pure nickel and Ni/Ti3Si（AI）C2 composite coatings were prepared by electrodeposition method from an additive-free nickel Watt＇s bath and were characterized by X-ray diffraction, laser confocal microscopy and scanning electron microscopy. The effect of current and Ti3Si（AI）C2 concentration in the solution on the composition, grain size, preferred orientation and surface morphology of the electrodeposited coatings were investigated. （200）-oriented Ni coatings could be deposited at high current （62.5 mA）, while （220）-oriented Ni coatings could be obtained at low current （25 mA）. However, the presence of Ti3Si（Al）C2 particles disturbed the surface texture of Ni crystallites in the composite coatings. Based on the simulated morphology and the observed microstructure, the mechanisms for the change of preferred orientation and crystallite shapes in the presence of Ti3Si（Al）C2 particles were discussed. Moreover, microhardness and friction properties of pure nickel and Ni/Ti3Si（Al）C2 composite coatings were also compared.

关键词： Ni/TiaSi(Al)C2 composite coatings Electrodeposition Preferred orientation Microstructure Mechanical properties

Transcriptome-wide effect of Salix SmSPR1 in etiolated seedling of Arabidopsis

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Journal of Forestry Research 2021年第3期32卷 975-985页

作者： xiaoxia liu Jianguo Zhang Li Xue Guodong Rao State Key Laboratory of Tree Genetics and Breeding Research Institute of ForestryChinese Academy of ForestryBeijing 100091People’s Republic of China Collaborative Innovation Center of Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjing 210037People’s Republic of China Key Laboratory of Tree Breeding and Cultivation State Forestry AdministrationResearch Institute of ForestryChinese Academy of ForestryBeijing 100091People’s Republic of China

Microtubules and their regulatory proteins are involved in the regulation of plant cell ***1(SPR1),a plant-specific microtubule-binding protein,is critical in regulating the anisotropic growth of plant *** previous study showed that overexpressed S alix SmS PR1 genes in Arabidopsis thaliana caused right-handed spiral elongation in etiolated seedlings,but there were no morphological differences between wild-type and transgenic seedlings under varied light *** then studied the transcriptional regulation patterns in transgenic plants engineered with the S mSPR1 *** results showed that a large number of differentially expressed genes were involved in plant light signal reception,chlorophyll synthesis and photosystem *** gene families with 42 photosynthesis-related genes and 6 light-responsive genes were involved in regulation of cell *** results showed that these genes in the SmSPR1-ox line were particularly down-regulated under dark *** addition,33 TFs showed differences between S mSPR1-ox and wild-type *** together,the transcriptome analysis provides new insight into investigating the molecular mechanisms of light-induced cell morphological changes mediated by the microtubule binding protein SPR1.

关键词： Arabidopsis thaliana Cell anisotropism SmSPR1 Transcription factor Transcriptome analysis

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油茶KAS基因家族的鉴定及表达分析

热带作物学报 2025年第1期46卷 10-20页

作者：刘晓霞喻子昊敬辉扬熊凯峰覃佐东湖南科技学院化学与生物工程学院/湖南省生物质资源综合开发利用工程技术研究中心湖南永州425199

酮脂酰ACP合成酶(beta-ketoacyl-acyl carrier protein synthase,KAS)是植物脂肪酸生物合成过程中的关键酶系。为探究KAS在油茶种子成熟和油脂积累中的作用,本研究通过生物信息学方法对CoKAS基因家族成员进行鉴定,分析其理化性质、染色... 详细信息

酮脂酰ACP合成酶(beta-ketoacyl-acyl carrier protein synthase,KAS)是植物脂肪酸生物合成过程中的关键酶系。为探究KAS在油茶种子成熟和油脂积累中的作用,本研究通过生物信息学方法对CoKAS基因家族成员进行鉴定,分析其理化性质、染色体定位、亚细胞定位、二级结构、进化关系、保守基序、启动子顺式作用元件,并采用RT-qPCR技术分析油茶果实油脂快速积累期的表达模式。结果表明:鉴定出的14个CoKAS家族成员分布在7条染色体上,相对分子质量在1.13~5.15 kDa之间,且大部分为酸性稳定蛋白。除CoKAS II-2定位于线粒体和叶绿体外,其余均定位于叶绿体。系统发育分析显示CoKAS基因被分为3个亚类,同一亚族成员的基因结构和保守基序具有相似性。CoKAS基因家族成员的启动子区域富含与生长发育、光响应、激素诱导和胁迫应答相关的顺式作用元件。通过表达分析发现,大部分CoKAS基因在油茶种子油脂快速积累期的表达量较高。此外,在油茶果实成熟过程中,CoKAS与CoMYB基因家族间存在有较强相关性的成员。本研究结果为深入解析CoKAS基因在油茶油脂生物合成中的调控机制提供理论基础。

关键词：油茶 CoKAS基因家族生物信息学表达分析

IMPULSE NOISE REMOVAL BY L1 WEIGHTED NUCLEAR NORM MINIMIZATION

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Journal of Computational Mathematics 2023年第6期41卷 1171-1191页

作者： Jian Lu Yuting Ye Yiqiu Dong xiaoxia liu Yuru Zou Shenzhen Key Laboratory of Advanced Machine Learning and Applications College of Mathematics and StatisticsShenzhen UniversityShenzhen 518060China Guangdong Key Laboratory of Intelligent Information Processing Pazhou LabGuangzhou 510335China Department of Applied Mathematics and Computer Science Technical University of Denmark2800 Kgs.LyngbyDenmark

In recent years,the nuclear norm minimization(NNM)as a convex relaxation of the rank minimization has attracted great research *** assigning different weights to singular values,the weighted nuclear norm minimization(WNNM)has been utilized in many ***,most of the work on WNNM is combined with the l 2-data-fidelity term,which is under additive Gaussian noise *** this paper,we introduce the L1-WNNM model,which incorporates the l 1-data-fidelity term and the regularization from *** apply the alternating direction method of multipliers(ADMM)to solve the non-convex minimization problem in this *** exploit the low rank prior on the patch matrices extracted based on the image non-local self-similarity and apply the L1-WNNM model on patch matrices to restore the image corrupted by impulse *** results show that our method can effectively remove impulse noise.

关键词： Image denoising Weighted nuclear norm minimization l 1-data-fidelity term Low rank analysis Impulse noise

Fundamentals and applications of enzyme powered micro/nano-motors

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Bioactive Materials 2021年第6期6卷 1727-1749页

作者： Hao Yuan xiaoxia liu Liying Wang Xing Ma Flexible Printed Electronic Technology Center and School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen518055China Shenzhen Bay Laboratory No.9 Duxue RoadShenzhen518055China Key Laboratory of Microsystems and Microstructures Manufacturing Harbin Institute of TechnologyHarbinHeilongjiang150001China

Micro/nanomotors(MNMs)are miniaturized machines that can convert many kinds of energy into mechanical *** the past decades,a variety of driving mechanisms have been developed,which have greatly extended the application scenarios of *** exist in natural organisms which can convert chemical energy into mechanical *** is an innovative attempt to utilize enzymes as biocatalyst providing driving force for *** fuels for enzymatic reactions are biofriendly as compared to traditional counterparts,which makes enzyme-powered micro/nanomotors(EMNMs)of great value in biomedical field for their nature of *** now,EMNMs with various shapes can be propelled by catalase,urease and many ***,they can be endowed with multiple functionalities to accomplish on-demand ***,combined with the development process of EMNMs,we are committed to present a comprehensive understanding of EMNMs,including their types,propelling principles,and potential *** this review,we will introduce single enzyme that can be used as motor,enzyme powered molecule motors and other micro/*** fundamental mechanism of energy conversion process of EMNMs and crucial factors that affect their movement behavior will be *** current progress of proof-of-concept applications of EMNMs will also be elaborated in *** last,we will summarize and prospect the opportunities and challenges that EMNMs will face in their future development.

关键词： Micro/nano-motors Enzymes Bio-catalytic reactions Active motion Self-propulsion mechanism

Enhancing charge storage of O-doped perovskite fluorides via in-situ electrochemical oxidation for high-performance potassium-ion capacitors

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Journal of Materials Science & Technology 2023年第27期158卷 111-120页

作者： Jing Zhao Zicheng Cai Yue Fan Yunan Wang Yu Song Jie liu Shuangwen Li Di Guo xiaoxia liu Department of Chemistry Northeastern UniversityShenyang 110819China School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources Shenyang 110819China School of Materials Engineering North China Institute of Aerospace EngineeringLangfang 065000China

Potassium ion capacitors(PICs)are regarded as promising large-scale aqueous energy storage ***,due to the poor K^(+)transport kinetics and the structural instability of the cathode materials,the key issues of limited energy density and poor cyclic stability are obstacles to the in-depth growth of ***,a novel O-doped perovskite fluoride is demonstrated via an in-situ electrochemical oxidation strategy as the cathode for PICs,introducing additional defects that improve the capacitance and facilitate the reaction kinetics of the *** the electrochemical oxidation process,it is discovered that the perovskite fluoride crystal tends to transform into disordered O-doped KMnF 3(K_(x)MnF_(y)O_(z)),realizing a structural reconstruction at the electrode material/electrolyte *** First-principles calculations based on density functional theory(DFT)are performed to confirm that the improved electrical conduc-tivity and low ionic adsorption energy may be ascribed to the substitution of oxygen for *** obtained K_(1.14)MnF_(1.17)O_(1.26) cathode achieves a high specific capacitance of 694 F g^(-1) at 1 A g^(-1),as well as high capacitance retention of 91.3%after 10,000 charge/discharge cycles in mild K_(2)SO_(4) *** study provides an effective strategy to improve the capacitive performance of perovskite fluoride cathode materials in electrochemical energy storage.

关键词： Perovskite fluorides O-doped Potassium-ion capacitors Charge storage mechanism

Molecular functions of nitric oxide and its potential applications in horticultural crops

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Horticulture Research 2021年第1期8卷 1123-1139页

作者： Chengliang Sun Yuxue Zhang Lijuan liu xiaoxia liu Baohai Li Chongwei Jin Xianyong Lin MOE Key Laboratory of Environment Remediation and Ecological Health College of Environmental&Resource SciencesZhejiang University310058 HangzhouChina Interdisciplinary Research Academy Zhejiang Shuren University310015 HangzhouChina Zhejiang Provincial Cultivated Land Quality and Fertilizer Administration Station HangzhouChina

Nitric oxide(NO)regulates plant growth,enhances nutrient uptake,and activates disease and stress tolerance mechanisms in most plants,making NO a potential tool for use in improving the yield and quality of horticultural crop *** the use of NO in horticulture is still in its infancy,research on NO in model plant species has provided an abundance of valuable information on horticultural crop *** evidence implies that the bioactivity of NO can occur through many potential mechanisms but occurs mainly through S-nitrosation,the covalent and reversible attachment of NO to cysteine *** this context,NO signaling specifically affects crop development,immunity,and environmental ***,NO can act as a fumigant against a wide range of postharvest diseases and ***,for effective use of NO in horticulture,both understanding and exploring the biological significance and potential mechanisms of NO in horticultural crop species are *** review provides a picture of our current understanding of how NO is synthesized and transduced in plants,and particular attention is given to the significance of NO in breaking seed dormancy,balancing root growth and development,enhancing nutrient acquisition,mediating stress responses,and guaranteeing food safety for horticultural production.

关键词： potential culture Molecular

A NONLOCAL KRONECKER-BASIS-REPRESENTATION METHOD FOR LOW-DOSE CT SINOGRAM RECOVERY

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Journal of Computational Mathematics 2024年第4期42卷 1080-1108页

作者： Jian Lu Huaxuan Hu Yuru Zou Zhaosong Lu xiaoxia liu Keke Zu Lin Li Shenzhen Key Laboratory of Advanced Machine Learning and Applications College of Mathematics and StatisticsShenzhen UniversityShenzhen 518060China National Center for Applied Mathematics Shenzhen(NCAMS) Shenzhen 518055China Department of Industrial and Systems Engineering University of Minnesota Twin CitiesMinneapolisMN55455USA Department of Applied Mathematics The Hong Kong Polytechnic UniversityHong Kong SARChina School of Electronic Engineering Xidian UniversityXi'an 710071China

Low-dose computed tomography(LDCT)contains the mixed noise of Poisson and Gaus-sian,which makes the image reconstruction a challenging *** order to describe the statistical characteristics of the mixed noise,we adopt the sinogram preprocessing as a stan-dard maximum a posteriori(MAP).Based on the fact that the sinogram of LDCT has non-local self-similarity property,it exhibits low-rank *** conventional way of solving the low-rank problem is implemented in matrix forms,and ignores the correlations among similar patch *** avoid this issue,we make use of a nonlocal Kronecker-Basis-Representation(KBR)method to depict the low-rank problem.A new denoising model,which consists of the sinogram preprocessing for data fidelity and the nonlocal KBR term,is developed in this *** proposed denoising model can better illustrate the generative mechanism of the mixed noise and the prior knowledge of the ***-merical results show that the proposed denoising model outperforms the state-of-the-art algorithms in terms of peak-signal-to-noise ratio(PSNR),feature similarity(FSIM),and normalized mean square error(NMSE).

关键词： Low-dose computed tomography Kronecker-basis-representation Low-rank imation.Noise-generating-mechanism

Clinical and translational values of spatial transcriptomics

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Signal Transduction and Targeted Therapy 2022年第5期7卷 1396-1412页

作者： Linlin Zhang Dongsheng Chen Dongli Song xiaoxia liu Yanan Zhang Xun Xu Xiangdong Wang Zhongshan Hospital Department of Pulmonary and Critical Care MedicineInstitute for Clinical ScienceShanghai Institute of Clinical BioinformaticsShanghai Engineering Research for AI Technology for Cardiopulmonary DiseasesShanghai 200000China Suzhou Institute of Systems Medicine Suzhou 215123 JiangsuChina Tsinghua-Berkeley Shenzhen Institute(TBSI) Tsinghua UniversityShenzhen 518055China BGI-Shenzhen Shenzhen 518083China

The combination of spatial transcriptomics(ST)and single cell RNA sequencing(scRNA-seq)acts as a pivotal component to bridge the pathological phenomes of human tissues with molecular alterations,defining in situ intercellular molecular communications and knowledge on spatiotemporal molecular *** present article overviews the development of ST and aims to evaluate clinical and translational values for understanding molecular pathogenesis and uncovering disease-specific biomarkers.

关键词： alterations translational Clinical