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Online Inertia Estimation Using Electromechanical Oscillation Modal Extracted from Synchronized Ambient Data

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Journal of Modern Power Systems and Clean Energy 2022年第1期10卷 241-244页

作者： Bo Wang Deyou Yang Guowei Cai jin ma Zhe Chen Lixin Wang School of Electrical Engineering Northeast Electrical Power UniversityJilin 132012China School of Electrical and Information Engineering The University of SydneySydneyAustralia Department of Energy Technology Aalborg UniversityAalborgDenmark

An ambient modal framework for inertia estimation using synchrophasor data is proposed in this ***,an analytical formulation is developed for the estimation of inertia based on the frequency and damping ratio modes extracted from ambient *** advantage of the proposed framework is that it can rely on synchronized ambient data under non-disturbed conditions for online estimation and tracking of ***,numerical simulation studies and physical experiments demonstrate the feasibility of the proposed approach.

关键词： Inertia electromechanical oscillation ambient modal

CuS nanoenzyme against bacterial infection by in situ hydroxyl radical generation on bacteria surface

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Rare Metals 2023年第6期42卷 1899-1911页

作者： Zhao Li Cheng-Jia Xie Xiao-Wei Ren Qun Zhang Bao-jin ma Department of Tissue Engineering and Regeneration School and Hospital of StomatologyCheeloo College of MedicineShandong University&Shandong Key Laboratory of Oral Tissue Regeneration&Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration&Shandong Provincial Clinical Research Center for Oral DiseasesJinan250012China jinan Food and Drug Inspection and Testing Center Jinan250010China

Nanoenzyme-mediated antibacterial strategies have been widely exploited to overcome the shortcomings(such as drug resistance and mild-to-severe side effects) of antibiotic *** peroxidase-like activity of nanoenzymes possesses great potential against bacterial infection by the generation of hydroxyl radical(·OH) in the specific ***,the lifetime of-OH is extremely short,and a large amount of the ·OH generated within the infection microenvironment cannot come into contact with bacteria quickly enough,thus resulting in low treatment ***,chitosan-oligosaccharide-modified CuS nanoparticles possessing positive charges(PCuS NPs) were prepared using a one-pot *** NPs exhibited efficient peroxidase-like ***,the PCuS NPs can combine with bacteria via electrostatic *** direct contact between the PCuS NPs and bacteria enabled the generation of ·OH in situ on the bacterial surface,ultimately leading to a high antibacterial efficacy at a low concentration in the presence of H_(2)O_(2).At an effective antibacterial concentration,the PCuS NPs exhibited high ***,in vivo results revealed that PCuS NPs not only decreased the size of abscesses but also reduced inflammation and promoted collagen fiber ***,PCuS NPs possess great potential against bacterial infection via in situ ·OH generation based on electrostatic attraction.

关键词： Antibacterial CuS Nanoenzyme In situ ·OH generation Electrostatic attraction

Supra-amphiphilic transparent mesoporous silica coating

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Chinese Science Bulletin 2006年第21期51卷 2572-2575页

作者： ma jin YANG Zhenglong QU Xiaozhong YANG Zhenzhong State Key Laboratory of Polymer Physics and Chemistry Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

Transparent mesoporous silica coatings were achieved by conventional sol-gel process. The obtained coatings display permanent supra- amphiphilicity, transparent appearance and good wetting property with very fast spread rate. Incorpo- ration of functional materials such as crystalline tita- nia nanoparticles into the coatings was also carried out without affecting the transparency and supra- amphiphilicity.

关键词：间隙孔硅石敷层溶胶-凝胶两性分子

Synthesis of 8-(ω-Chloroalkyl)-dipyrrinones

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Chemical Research in Chinese Universities 2000年第3期16卷 266-270页

作者： TU Bin ZHANG Yi WANG Chang qi ma jin shi Center for Molecular Science Institute of ChemistryChinese Academy of SciencesBeijing 100080P.R.China Institute of Photographic Chemistry Chinese Academy of SciencesBeijing 100101P.R.China

Dipyrrinones, typically bright yellow compounds with a long axis-polarized π-π* excitation in the 14π-electron-conjugated chromophore, such as xanthobilirubic acid methyl ester (XBRMe), are useful building blocks for the synthesis of biologically important tetrapyrrole pigments such as bilirubin. They have been extensively used as model dipyrrole pigments for the spectroscopic and the photochemical studies of linear tetrapyrroles. They have also served as useful adjuncts in the studies of jaundies phototherapy and in bilirubin structure-biological function relationships. The synthesis and results of 8-(ω-chloroalkyl)-dipyrrinones were discussed.

关键词： Friedel Crafts acylation Reduction Dipyrrinone

Peptide dendrimer-crosslinked inorganic-organic hybrid supramolecular hydrogel for efficient anti-biofouling

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Chinese Chemical Letters 2018年第3期29卷 501-504页

作者： Xiaoqi Lian Dongxu Shi jin ma Xiaojun Cai Zhongwei Gu National Engineering Research Center for Biomaterials Sichuan University College of materials Science and Engineering Nanjing Tech University

We reported a kind of inorganic-organic hybrid supramolecular hydrogel with excellent anti-biofouling capability. The hydrogel was formed via ionic interaction between the negative-charged sodium polyacrylate （SPA） entwined clay nanosheets （CNS） and positive-charged polyhedral oligomeric silsesquioxane （POSS） core-based generation one （L-Arginine） dendrimer （POSS-R）. Due to their strong ionic interaction, this kind of hydrogel exhibited a rapid gelation behavior which accomplished even at a low POSS-R concentration about 1% w/v. With the increase of POSS-R concentration, these hydrogels appeared more compact structure, accompanied by remarkable enhanced mechanical strength. In addition, these hydrogels demonstrated rapid thixotropic response and shape-memory capability, as well as good hiocompatibility. More importantly, these hydrogels exhibited outstanding anti-biofouling property due to the inherent anti-biofouling capability of SPA. Overall, these findings demonstrated a novel sort of inorganic-organic hybrid supramolecular hydrogel with tunable mechanical strength and excellent anti-biofouling capability, which may have a broad application potential in tissue engineering.

关键词： Peptide dendrimer Supramolecular hydrogel Anti-biofouling

Sinogram denoising via attention residual dense convolutional neural network for low-dose computed tomography

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Nuclear Science and Techniques 2021年第4期32卷 70-83页

作者： Yin-jin ma Yong Ren Peng Feng Peng He Xiao-Dong Guo Biao Wei Key Laboratory of Optoelectronic Technology and Systems Ministry of EducationChongqing UniversityChongqing 400044China School of Data Science Tongren UniversityTongren 554300China School of Microelectronics and Communication Engineering Chongqing UniversityChongqing 400044China Department of Biomedical Engineering Rensselaer Polytechnic InstituteTroyNY 12180USA

The widespread use of computed tomography(CT)in clinical practice has made the public focus on the cumulative radiation dose delivered to ***-dose CT(LDCT)reduces the X-ray radiation dose,yet compromises quality and decreases diagnostic *** have made great efforts to develop various algorithms for LDCT and introduced deep-learning techniques,which have achieved impressive ***,most of these methods are directly performed on reconstructed LDCT images,in which some subtle structures and details are readily lost during the reconstruction procedure,and convolutional neural network(CNN)-based methods for raw LDCT projection data are rarely *** address this problem,we adopted an attention residual dense CNN,referred to as AttRDN,for LDCT sinogram ***,it was aided by the attention mechanism,in which the advantages of both feature fusion and global residual learning were used to extract noise from the contaminated LDCT ***,the denoised sinogram was restored by subtracting the noise obtained from the input noisy ***,the CT image was reconstructed using filtered *** experimental results qualitatively and quantitatively demonstrate that the proposed AttRDN can achieve a better performance than state-of-the-art ***,it can prevent the loss of detailed information and has the potential for clinical application.

关键词： Low-dose CT Sinogram denoising Deep learning Attention mechanism

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马进

世界建筑 2021年第5期 39-39,126页

作者：马进东南大学建筑学院南京邦建(UAG)

在西建大学习中,给我印象最深的是前几届学长获得了"UIA国际大学生建筑设计竞赛"的一等奖,这给我们这些刚刚入学的新生很大的触动和激励。我仔细研究了那次竞赛的获奖作业,对我的影响有3个方面:(1)对建筑学的认识不再仅仅停留在表面的形... 详细信息

在西建大学习中,给我印象最深的是前几届学长获得了"UIA国际大学生建筑设计竞赛"的一等奖,这给我们这些刚刚入学的新生很大的触动和激励。我仔细研究了那次竞赛的获奖作业,对我的影响有3个方面:(1)对建筑学的认识不再仅仅停留在表面的形式,而是要建立起一套从社会学、城市问题到建筑的完整的逻辑;(2)竞赛的选题是关于西安"三学街"的保护与更新,这说明建筑学的研究并非虚无缥缈,由我们身边实际的问题出发,也是可以获得国际承认的高水平成果的;(3)对全球建筑学的前沿理论和实践要保持关注(从此我成为系图书馆外刊室的常驻人员)。这3个方面的影响形成了我多年来思考问题的基本价值观和研学的习惯。

关键词：基本价值观建筑学三学街保护与更新图书馆大学生建筑设计竞赛

Modal Parameter Identification Method of Jacket Platform Structure Based on AFDD and Optimized FBFFT

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China Ocean Engineering 2023年第3期37卷 393-407页

作者： LENG Jian-cheng ma jin-yong FAN Zong-heng QIAN Wan-dong FENG Hui-yu School of Mechanical Science and Engineering Northeast Petroleum UniversityDaqing 163318China

Offshore platforms are susceptible to structural damage due to prolonged exposure to random loads,such as wind,waves,and *** is particularly true for platforms that have been in service for an extended *** the modal parameters of offshore platforms is crucial for damage diagno sis,as it serves as a prerequisite and foundation for the ***,it holds great significance to prioritize the identification of these *** at the shortcomings of the traditional Fast Bayesian Fast Fourier Transform(FBFFT) method,this paper proposes a modal parameter identification method based on Automatic Frequency Domain Decomposition(AFDD) and optimized *** introducing the AFDD method and Powell optimization algorithm,this method can automatically identify the initial value of natural frequency and solve the objective function efficiently and *** order to verify the feasibility and effectiveness of the proposed method,it is used to identify the modal parameters of the IASC-ASCE benchmark model and the j acket platform structure model,and the Most Probable Value(MPV) of the modal parameters and their respective posterior uncertainties are successfully *** identification results of the IASC-ASCE benc hmark model are compared with the identification re sults of the MODE-ID method,which verifies the effectivene ss and accuracy of the proposed method for identifying modal *** provides a simple and feasible method for quantifying the influence of uncertain factors such as environmental parameters on the identification results,and also provide s a reference for modal parameter identification of other large structures.

关键词： jacket platform uncertain modal parameter identification FBFFT method environmental excitation AFDD method Powell optimization

Several major issues concerning the environmental transmission and risk prevention of SARS-CoV-2

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Science China Earth Sciences 2022年第6期65卷 1047-1056页

作者： jin ma Jian XU Xiaoli ZHAO Shouliang HUO Xiaoli DUAN Yunsong MU Ying WANG Yuan WEI Jiang CHANG Xiaowei jin Fengchang WU State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China School of Environment and Nature Resource Renmin University of ChinaBeijing 100872China School of Space and Environment Beihang UniversityBeijing 102206China China National Environmental Monitoring Centre Beijing 100012China

Coronavirus disease 2019(COVID-19) is the most serious infectious disease pandemic in the world in a century, and has had a serious impact on the health, safety, and social and economic development of all mankind. Since the earth entered the“Anthropocene”, human activities have become the most important driving force of the evolution of the earth system. At the same time, the epidemic frequency of major human infectious diseases worldwide has been increasing, with more than 70% of novel diseases having zoonotic origins. The review of several major epidemics in human history shows that there is a common rule, i.e., changes in the natural environment have an important and profound impact on the occurrence and development of epidemics. Therefore, the impact of the natural environment on the current COVID-19 pandemic and its mechanisms have become scientific issues that need to be resolved urgently. From the perspective of the natural environment, this study systematically investigated several major issues concerning the environmental transmission and risk prevention of Severe Acute Respiratory Syndrome Coronavirus 2(SARS-CoV-2). From a macroscopic temporal and spatial scale, the research focus on understand the impact of the destruction of the natural environment and global changes on the outbreak of infectious diseases;the threat of zoonotic diseases to human health;the regularity for virus diffusion, migration and mutation in environmental media;the mechanisms of virus transmission from animals and environmental media to humans;and environmental safety, secondary risk prevention and control of major epidemics. Suggestions were made for future key research directions and issues that need attention, with a view to providing a reference for the prevention and control of the global coronavirus disease 2019, and to improving the ability of response to major public health emergencies.

关键词： SARS-CoV-2 Environmental transmission Risk prevention Zoonotic diseases Ecological security

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