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Metal-organic framework hybrid materials of ZIF-8/RGO for immobilization of D-amino acid dehydrogenase

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Nano Research 2024年第1期17卷 290-296页

作者： Hangbin Lei Qian Zhang Xiaoyan Xiang Liang Jiang Shiyan wang lingxuan Duan Shizhen wang Department of Chemical and Biochemical Engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Xiamen Key Laboratory of Synthetic Biotechnology Xiamen UniversityXiamen 361005China

Immobilization of D-amino acid dehydrogenase(DAADH)by the assembly of peptide linker was studied for the biosynthesis of *** material of zeolitic imidazolate framework-8(ZIF-8)combined with reduced graphene oxide(RGO)was applied for the immobilization of DAADH from Ureibacillus *** recovery rate of DAADH/ZIF-8/RGO was 165.6%.DAADH/ZIF-8/RGO remained 53.4%of its initial activity at 50°C for 10 h while the free enzyme was ***/ZIF-8/RGO maintained 70.5%activity in hyperalkaline solution with pH *** parameters indicated that DAADH/ZIF-8/RGO had greater affinity of phenylpyruvate as V_(max)/K_(m)of DAADH/ZIF-8/RGO was 1.27-fold than free *** seven recycles,the activity of DAADH/ZIF-8/RGO remained 64.3%.Furthermore,one-step separation and in situ immobilization of DAADH by ZIF-8/RGO/Ni was carried out with 1.5-fold activity *** peptide linker and metal-organic framework(MOF)immobilization,thermostability and activity of the immobilized DAADH were significantly improved.

关键词： D-Amino acid dehydrogenase immobilization metal-organic frameworks zeolitic imidazolate framework-8(ZIF-8) reduced graphene oxide

An efficiency algorithm on Gaussian mixture UKF for BDS/INS navigation system

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Geodesy and Geodynamics 2018年第2期9卷 169-174页

作者： Qing Dai Lifen Sui lingxuan wang Tian Zeng Yuan Tian Dept.Spatial Information Information Engineering University

To further improve the performance of UKF(Unscented Kalman Filter) algorithm used in BDS/SINS(BeiDou Navigation Satellite System/Strap down Inertial Navigation System), an improved GM-UKF(Gaussian Mixture Unscented Kalman Filter) considering non-Gaussian distribution is discussed in this paper. This new algorithm using SVD(Singular Value Decomposition) is proposed to alternative covariance square root calculation in UKF sigma point production. And to end the rapidly increasing number of Gaussian distributions, PDF(Probability Density Function) re-approximation is conducted. In principle this efficiency algorithm proposed here can achieve higher computational speed compared with traditional GM-UKF. And simulation experiment result show that, compared with UKF and GM-UKF algorithm, new algorithm implemented in BDS/SINS tightly integrated navigation system is suitable for handling nonlinear/non-Gaussian integrated navigation position calculation, for its lower computational complexity with high accuracy.

关键词： Gaussian mixture UKF Singular Value Decomposition Integrated navigation Time complexity

Spatiotemporal variations,influencing factors,and configurational promotion paths of energy efficiency in China’s cities

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Chinese Journal of Population,Resources and Environment 2024年第1期22卷 74-86页

作者： Ruyu Xu Keliang wang Zhuang Miao lingxuan Sun School of Economics Ocean University of ChinaQingdao 266011China China Western Economic Research Center Southwestern University of Finance and EconomicsChengdu 611130China School of Economics and Management Southwest Petroleum UniversityChengdu 610500China

The promotion of energy efficiency(EE)helps address energy constraints and promote environmental *** study comprehensively explores the spatiotemporal variations,influencing factors,and configuration promotion paths of EE in 284 Chinese cities during 2003‒2019 using the global super-efficiency minimum distance to strong efficient frontier(G-S-MinDS),exploratory spatial data analysis(ESDA),multiscale geographically weighted regression(MGWR),and fuzzy set qualitative comparative analysis(fsQCA)*** findings are:①China’s cities have an annual average EE of 0.658 with a growth rate of 0.53%,showing considerable promotion potential.②Industrial structure optimization,population agglomeration,economic development,and increased green coverage contribute positively,while government intervention and openness hinder China’s urban EE.③Four configurational promotion paths for enhancing China’s urban EE are identified,where among those paths population density is a core condition,while government intervention is *** study provides valuable insights into substantially improving urban EE,emphasizing the need for targeted policies to address energy and environmental crises in China.

关键词： Energy efficiency Spatiotemporal variations Influencing factors Configurational promotion paths

Study on time-resolved fluorescence dynamics of cyanine dye sensitizing AgBr

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Science China(Physics,Mechanics & Astronomy) 2008年第3期51卷 243-250页

作者： YANG ShaoPeng FAN ShanShan LI ChunLei FAN GuoZhi MENG Tao LI XiaoWei FU GuangSheng AI XiCheng ZHAO XiaoHui YE JianPing wang lingxuan College of Physics Science&Technology Hebei UniversityBaoding 071002China Institute of Chemistry Chinese Academy of SciencesBeijing 100080China

The fluorescence spectra of three different dyes adsorbed on the tabular and cubic AgBr microcrystals are obtained by the picosecond time-resolved streak camera technique. The dependence of the ultrafast electron transferring from dye-aggre-gates to the conduction band of AgBr and the efficiency of spectral sensitization on different kinds of dyes with different concentrations is analyzed. Further more,the microcosmic mechanism of the sensitization process is discussed. It is found that the fluorescence decay curves are fitted very well by the double exponential func-tion,consisting of a slow component and a fast one with large amplitude. We con-sider this fast one mainly attributable to the electron transfer from dye J-aggre-gates to the conduction band of AgBr.

关键词： spectral sensitization electron transfer rate Streak Camera AgBr

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一种鲁棒的LiDAR-IMU联合标定方法

机器人 2023年第3期45卷 267-275页

作者：王凌轩项志宇浙江大学信息与电子工程学院浙江杭州310063

针对目前主流的LiDAR-IMU联合标定方法在遮挡较为严重或者缺乏大块平面的复杂环境下标定精度较低的问题,提出了一种鲁棒的LiDAR-IMU联合标定方法。首先,在匹配构建阶段引入了定位精度高、不易受遮挡等影响的线特征,并同时构建线特征和... 详细信息

针对目前主流的LiDAR-IMU联合标定方法在遮挡较为严重或者缺乏大块平面的复杂环境下标定精度较低的问题,提出了一种鲁棒的LiDAR-IMU联合标定方法。首先,在匹配构建阶段引入了定位精度高、不易受遮挡等影响的线特征,并同时构建线特征和面片匹配对来增强标定约束;其次,在迭代优化阶段设计了一种双阶段的优化方法,并根据每轮迭代优化的几何残差设计了自适应损失权重,使得迭代优化过程能很好地收敛,并提高了标定方法的精度。利用自建的室内数据集和开源的室外数据集对该方法进行了测试,结果表明,本文方法对于平移外部参数的标定标准差约为2 mm,旋转外部参数的标定标准差约为0.04°,优于当前主流标定方法的结果。

关键词：激光雷达惯性测量单元标定移动机器人导航线特征

Tumor initiation and early tumorigenesis:molecular mechanisms and interventional targets

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Signal Transduction and Targeted Therapy 2024年第7期9卷 2900-2935页

作者： Shaosen Zhang Xinyi Xiao Yonglin Yi Xinyu wang lingxuan Zhu Yanrong Shen Dongxin Lin Chen Wu Department of Etiology and Carcinogenesis National Cancer Center/National Clinical Research Center/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical College100021 BeijingChina Key Laboratory of Cancer Genomic Biology Chinese Academy of Medical Sciences and Peking Union Medical College100021 BeijingChina Changping Laboratory 100021 BeijingChina Collaborative Innovation Center for Cancer Personalized Medicine Nanjing Medical UniversityNanjing 211166China Sun Yat-sen University Cancer Center State Key Laboratory of Oncology in South ChinaGuangzhou 510060China CAMS Oxford Institute Chinese Academy of Medical Sciences100006 BeijingChina

Tumorigenesis is a multistep process,with oncogenic mutations in a normal cell conferring clonal advantage as the initial ***,despite pervasive somatic mutations and clonal expansion in normal tissues,their transformation into cancer remains a rare event,indicating the presence of additional driver events for progression to an irreversible,highly heterogeneous,and invasive ***,researchers are emphasizing the mechanisms of environmental tumor risk factors and epigenetic alterations that are profoundly influencing early clonal expansion and malignant evolution,independently of inducing ***,clonal evolution in tumorigenesis reflects a multifaceted interplay between cell-intrinsic identities and various cell-extrinsic factors that exert selective pressures to either restrain uncontrolled proliferation or allow specific clones to progress into ***,the mechanisms by which driver events induce both intrinsic cellular competency and remodel environmental stress to facilitate malignant transformation are not fully *** this review,we summarize the genetic,epigenetic,and external driver events,and their effects on the co-evolution of the transformed cells and their ecosystem during tumor initiation and early malignant evolution.A deeper understanding of the earliest molecular events holds promise for translational applications,predicting individuals at high-risk of tumor and developing strategies to intercept malignant transformation.

关键词： alterations mechanisms restrain

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当代CG技术革新对动画本体认识带来的思考

当代电影 2014年第7期 147-149页

作者：王凌轩中国传媒大学艺术学部动画与数字艺术学院 2012级博士研究生100024

动画本体的定义包含着对具体技术的描述,但对照这样一种蓬勃发展的当代艺术门类,动画技术的飞速发展,尤其是CG技术的出现,极大地革新了动画制作的理念和方法。诸多原本服务于动画的技术也已经泛化到了各种艺术和应用领域。这种新的趋势... 详细信息

动画本体的定义包含着对具体技术的描述,但对照这样一种蓬勃发展的当代艺术门类,动画技术的飞速发展,尤其是CG技术的出现,极大地革新了动画制作的理念和方法。诸多原本服务于动画的技术也已经泛化到了各种艺术和应用领域。这种新的趋势对于原有的动画本体定义进行了新的诠释和颠覆,模糊了动画艺术本身与这些CG技术泛化领域之间的界限。从传统动画本体定义的合理规定出发,一个可以包容CG技术现有以及未来可能发展方向的核心理念——"影像运动的时空的解构与重构"被抽象出来,试图诠释被具体技术遮蔽的动画艺术创作的本体特征。结合传统动画本体定义中"运动的幻觉"的审美特性,我们可以依据这一基本理念去审视那些或依附或背离动画本体的创作尝试,从而在CG技术泛化的时代把握动画艺术的本质和创作取向。

关键词： CG技术动画本体解构与重构

INS-Aided Single-Frequency Cycle-Slip Detection for Real-Time Kinematic GNSS

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INS-Aided Single-Frequency Cycle-Slip Detection for Real-Tim...

Bifunctional noble-metal-free cocatalyst coating enabling better coupling of photocatalytic CO_(2)reduction and H_(2)O oxidation on direct Z-scheme heterojunction

第九届中国卫星导航学术年会

作者： lingxuan wang Yu Gan Erhu Wei Lifen Sui Xuexi Liu School of Geodesy and Geomatics Wuhan University Information Engineering University

GNSS ambiguity fixed solution can greatly improve the accuracy of GNSS/INS integrated *** it is difficult to achieve perfect real-time dynamic single frequency cycle-slip detection merely by GNSS observations especially in complex *** assisted cycle-slip detection terms(DTs) based on station-satellite double-differences and satellite single-difference observations are *** error characteristic of the DT is analyzed *** DT error is affected by the drift of INS *** addition,the magnitude of the influence on different satellites is related to the angle between its station-satellite vector and that that vector of the reference ***,it is important to select reference *** is proposed that two group of DTs can be used together by selecting two different reference *** threshold of detection is estimated in a sliding window,where the DTs,whose INS error is submerged in GNSS error,are removed in order to reflect INS *** method of threshold estimating has stronger self-adaptability.

关键词： GNSS/INS Cycle-slip Single frequency Reference satellite Sliding window Azimuth

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Nano Research 2024年第6期17卷 5022-5030页

作者： Wei Zhao Weihao Mo Yan Zhang lingxuan Hu Yiyi Zheng Zhulei Chen Xiangyue Niu Yuling Zhao Lichun Liu Shuxian Zhong Song Bai Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Materials ScienceZhejiang Normal UniversityJinhua 321004China College of Biological Chemical Sciences and Engineering and Nanotechnology Research InstituteJiaxing UniversityJiaxing 314001China College of Geography and Environmental Sciences Zhejiang Normal UniversityJinhua 321004China College of Chemical and Biological Engineering Zhejiang UniversityHangzhou 310058China School of Biological and Chemical Engineering Panzhihua UniversityPanzhihua 617000China

Selective loading of spatially separated redox cocatalysts on direct Z-scheme heterojunctions holds great promise for advancing the efficiency of artificial photosynthesis,which however is limited to the photodeposition of noble metal cocatalysts and the fabrication of hollow double-shelled semiconductor ***,the co-exposure of discrete cocatalyst and semiconductor increases the product diversity when both the exposed sites of which participate in CO_(2)***,we present a facile and versatile protocol to overcome these limitations via surface coating of Z-scheme heterojunctions with bifunctional noble-metal-free *** Cu_(2)O/Fe_(2)O_(3)(CF)as a model heterojunction and layered Ni(OH)_(2)as a model cocatalyst,it is found that Ni(OH)_(2)lying on the surfaces of Cu_(2)O and Fe_(2)O_(3)separately co-catalyzes the CO_(2)reduction and H_(2)O *** experimental and theoretical investigation reveals that the Ni(OH)_(2)outer layer:(i)mitigates the charge recombination in CF and balances their transfer and consumption;(ii)reduces the rate-determining barriers for CO_(2)-to-CO and H_(2)O-to-O_(2)conversion,(iii)suppresses the side proton reduction occurring on CF,and(iv)protects the CF from component *** expected,the redox reactions stoichiometrically proceed,and significantly enhanced photocatalytic activity,selectivity,and stability in CO generation are achieved by the stacked Cu_(2)O/Fe_(2)O_(3)@Ni(OH)_(2)in contrast to *** study demonstrates the significance of the synergy between bifunctional cocatalysts and Z-scheme heterojunctions for improving the efficacy of overall redox reactions,opening a fresh avenue for the rational design of artificial photosynthetic systems.

关键词： Z-scheme heterojunction bifunctional cocatalyst CO_(2)reduction H_(2)O oxidation stoichiometric redox reaction