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时间分数阶色散方程的高阶差分方法

中国海洋大学学报（自然科学版） 2013年第10期43卷 119-122页

作者：谢树森王辉中国海洋大学数学科学学院山东青岛266100

时间分数阶色散方程用以描述带有记忆性的色散现象。本文研究分数阶色散方程的高精度差分方法,利用紧致差分格式的构造技巧,得到了求解时间分数阶色散方程的四点四阶和五点六阶2个紧致隐式差分格式,收敛阶分别为O(τ2+h4)和O(τ2+h6).... 详细信息

时间分数阶色散方程用以描述带有记忆性的色散现象。本文研究分数阶色散方程的高精度差分方法,利用紧致差分格式的构造技巧,得到了求解时间分数阶色散方程的四点四阶和五点六阶2个紧致隐式差分格式,收敛阶分别为O(τ2+h4)和O(τ2+h6).数值算例表明本文方法是高精度有效的,且具有很好的数值稳定性。

关键词：分数阶色散方程紧致差分格式高精度

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灵宝背靠背直流输电工程冗余极控系统的实现

电力系统自动化 2005年第20期29卷 89-92页

作者：曹森王德意王涛郭宏光张望西安理工大学水电学院陕西省西安市710048 许继直流输电系统部河南省许昌市461000

直流输电系统中,极控系统输出小的变化可能导致传输功率产生很大的波动。为保证在运行系统故障时冗余系统之间无扰动切换,冗余极控系统的运行点要尽可能保持一致。介绍了灵宝背靠背直流输电工程中冗余极控系统的具体实现方法,系统选择... 详细信息

直流输电系统中,极控系统输出小的变化可能导致传输功率产生很大的波动。为保证在运行系统故障时冗余系统之间无扰动切换,冗余极控系统的运行点要尽可能保持一致。介绍了灵宝背靠背直流输电工程中冗余极控系统的具体实现方法,系统选择单元的设计采用传统的电子设计技术,没有使用微处理器,从而不依赖于编程软件。该设计方法能保证系统选择单元和极控系统相互独立,不仅提高了系统的可靠性,而且保证了冗余系统之间快速切换。实时数字仿真器(RTDS)上的仿真结果进一步表明这种设计方法适用于直流输电系统冗余的需要。

关键词：背靠背直流输电系统极控系统冗余设计 RTDS

Cortical code and connectivity

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Cortical code and connectivity

Implications of metabolic dysfunction associated fatty liver disease in COVID-19

中国神经科学学会第十二届全国学术会议

作者： sen Song Tsinghua University

Recurrent connections were discovered more than a decade ago in primary visual cortex. But its functional role still remains debated. In this paper, we trained a convolutional neural network with recurrent connections on natural images. We show that the results connectivity and coding pattern resembles those discovered in biological experiments. Furthermore, we reveal the surprising fact that recurrent connections in this model increases robustness rather than performance.

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World Journal of Clinical Cases 2023年第6期11卷 1275-1286页

作者： Raja Chakraborty Deepak Sharma Devesh U Kapoor Akanksha Dwivedi Rakhi Khabiya Saikat sen Institute of Pharmacy Assam Don Bosco UniversityGuwahati 782402AssamIndia School of Medical Sciences Adamas UniversityKolkata 700126West BengalIndia Department of Pharmacy Dr.Dayaram Patel Pharmacy CollegeBardoli 394601GujaratIndia Department of Pharmacy Acropolis Institute of Pharmaceutical Education&ResearchIndore 453771Madhya PradeshIndia Faculty of Pharmaceutical Science Assam down town UniversityGuwahati 781026AssamIndia

Metabolic associated fatty liver disorder(MAFLD)characterizes the contributing etiologies(i.e.,type 2 diabetes mellitus,metabolic syndrome,overweight)of individuals with fatty liver disease that affects 1/3rd of the world *** 2020,the coronavirus disease 2019(COVID-19)crisis was unprecedented,and people with different comorbidities became more susceptible to the infection caused by severe acute respiratory syndrome coronavirus *** patients are frequently obese with added metabolic menace like diabetes,hypertension,and dyslipidemia leading to greater jeopardy of *** patients are 4 to 6-fold more prone towards ***-19 induces liver injury with elevated levels of aspartate aminotransferase and alanine aminotransferase and insignificantly elevated ***,MAFLD in COVID-19 patients worsens the condition *** evidence highlighting the interaction between MAFLD and altered liver functioning in COVID-19 suggested that COVID-19 patients with pre-existing MAFLD are at greater risk of morbidity or intensive care unit *** hepatic injury,enhanced levels of inflammatory cytokines,declined hepatic mitochondrial activity,and compromised immunity are considered as some underlying *** main focus of this review is to discuss the implications of metabolic dysfunction associated with fatty liver disease in COVID-19 *** review systematically analyzes the effect of striking two worldwide pandemics(MAFLD and COVID-19)together in the present era.

关键词： Metabolic associated fatty liver disorder COVID-19 Metabolic dysfunction Hepatic damage Cytokine storm

High norbornene incorporation in ethylene-norbornene copolymerization with a bis(α-alkyloxoimine) titanium-MAO catalyst

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Science China Chemistry 2010年第8期53卷 1634-1640页

作者： GAO HaiYang1,2,HU Hao1 & WU Qing1,2 1Institute of Polymer Science,School of Chemistry and Chemical Engineering,Sun Yat-sen (Zhongshan) University,Guangzhou 510275,China 2Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education Sun Yat-sen (Zhongshan) University,Guangzhou 510275,China Institute of Polymer Science School of Chemistry and Chemical Engineering Sun Yat-Sen (Zhongshan) University Guangzhou China Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education Sun Yat-Sen (Zhongshan) University Guangzhou China

A novel bis(α-alkyloxoimine) titanium(IV) complex was synthesized and used as a catalyst precursor to catalyze homo-and copolymerization of ethylene and *** titanium complex activated with methylalumoxane exhibits good activities for the homopolymerizations of ethylene and norbornene under high temperature to produce high-molecular-weight linear polyethylene and vinyl-type polynorbornene,***-norbornene copolymers with high molecular weight can also be produced by this *** incorporation of norbornene from 0 to 76 mol% in the copolymers can be controlled by varying the charged norbornene.13C NMR analyses show that the microstructures of the ethylene-norbornene copolymers with low norbornene incorporation are predominantly alternated and isolated norbornene units,while those with high norbornene incorporation are random polymers containing long norbornene sequences.

关键词： catalyst ethylene norbornene polymerization copolymerization

Residual Phase Noise and Time Jitters of Single-Chip Digital Frequency Dividers

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Journal of Electronic Science and Technology 2015年第3期13卷 264-268页

作者： Lu-Lu Yan sen Meng Wen-Yu Zhao Wen-Ge Guo Hai-Feng Jiang Shou-Gang Zhang the Key Laboratory of Time and Frequency Standards National Time Service Center (NTSC) Chinese Academy of Sciences the School of Science Xi’an Shiyou University the Key Laboratory of Time and Frequency Standards National Time Service Center Chinese Academy of Sciences

In this paper, we demonstrate the residual phase noise of a few microwave frequency dividers which usually limit the performance of frequency synthesizers. In order to compare these dividers under different operation frequencies, we calculate additional time jitters of these dividers by using the measured phase noise. The time jitters are various from -0.1 fs to 43 fs in a bandwidth from 1 Hz to 100 Hz in dependent of models and operation frequencies. The HMC series frequency dividers exhibit outstanding performance for high operation frequencies, and the time jitters can be sub-fs. The time jitters of SP8401, MC10EP139, and MC100LVEL34 are comparable or even below that of HMC series for low operation frequencies.

关键词： Frequency divider phase noise spectra analysis time jitter

Prediction of TACE Substrates in Human Proteome

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Prediction of TACE Substrates in Human Proteome

Transfer-free CVD graphene for highly sensitive glucose sensors

第五届全国生物信息学与系统生物学学术大会暨国际生物信息学前沿研讨会高通量时代的生物信息学与系统生物学

作者： sen Liu Institute of Molecular Biology China Three Gorges University Medical Science College China Three Gorges University

Background:Tumor necrosis factor-alpha converting enzyme(TACE) is a membraneanchored protein that releases the soluble forms of many proteins by a process called ectodomain *** has been considered as a potential target in a lot of diseases in autoimmune diseases and recently,in *** spite a lot of protein substrates have been found these years for TACE,the substrate selection of TACE is still not *** better understand the substrate selection of TACE,and the physiological importance of TACE, a substrate-prediction protocol will be developed for TACE,and used for TACE substrate prediction in human proteome. Methods:Firstly,a complex structure model was constructed with Rosetta by using the PDB structure of the catalytic domain of TACE and the recognition peptide of TACE in TNFalpha. With this model,the substrate selectivity and specificity of TACE were predicted and scanned with Rosetta ***,a substrate prediction model was constructed,and used to predict potential TACE substrates in human proteome. Results:In the TACE-peptide complex model,the peptide forms nice conlact with the catalytic domain of *** residues between P3 and P2’ sites of the peptide are the most important residues with high selectivity and *** affinity indexes of the peptide residues can be used to establish a prediction model for TACE substrate,and indeed,the model shows good correlation with experimental *** model also shows high potential for prediction possible TACE substrates in human proteome. Conclusions:A reasonable TACE-substrate interaction model has been modeled. The model can be used to predict the substrate selectivity and specificity of *** potential use of this model in predicting possible TACE substrates in human proteome will be very helpful for better understanding of the physiological mechanisms of TACE and the development of TACE-targeted drugs.

关键词： TNF-alpha TNF-alpha converting enzyme Substrate prediction Protein-peptide interaction

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Journal of Materials Science & Technology 2020年第2期37卷 71-76页

作者： Shijing Wei Yabin Hao Zhe Ying Chuan Xu Qinwei Wei sen Xue Hui-Ming Cheng Wencai Ren Lai-Peng Ma You Zeng Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Physical Science and Technology ShanghaiTech UniversityShanghai200031China Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai200050China University of Chinese Academy of Sciences Beijing100049China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China School of Materials Science and Engineering Northeastern UniversityShenyang110819China Shenzhen Geim Graphene Center Tsinghua-Berkeley Shenzhen Institute(TBSI)Tsinghua UniversityShenzhen518055China

Chemical vapor deposition(CVD)graphene film is a promising electrode-modifying material for fabricating high-performance glucose sensor due to its high electrical conductivity and two-dimensional structure over large ***,the use of typical metal-based CVD graphene suffers from the residue contamination of polymer transfer-support and heavy metal *** this work,we directly grew fewlayer graphene on the SiO2/Si substrate without transfer process and then fabricated graphene-based glucose sensors by sequentially immobilizing glucose oxidase and depositing Nafion layer on its surface that was functionalized by oxygen-plasma *** transfer-and metal-free process shows distinct advantage over the common metal-CVD method in improving the electrochemical performance by eliminating the contamination of ***-obtained glucose sensor shows a high sensitivity(16.16μA mM-1cm-2)with a detection limit of 124.19μ*** method is simple and promising for the development of highly sensitive glucose sensors.

关键词： Graphene Chemical vapor deposition Transfer-free Oxygen-plasma treatment Glucose sensor

Event-Trigger Extended Kalman Filter Design for Distributed Generation Network with Limited Communication 36

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Event-Trigger Extended Kalman Filter Design for Distributed ...