检索结果-南通市图书馆

Estimation of Nonlinear Roll Damping by Analytical Approximation of Experimental Free-Decay Amplitudes

Journal of Ocean University of China 2019年第4期18卷 812-822页

作者： SUN Jinwei shao meng College of Engineering Ocean University of China Qingdao 266100 China Key Laboratory of Ocean Engineering of Shandong Province Ocean University of China Qingdao 266100 China Institute of Oceanographic Instrumentation Qilu University of Technology (Shandong Academy of Sciences) Qingdao 266001 China Shandong Provincial Key Laboratory of Ocean Environmental Monitoring Technology Qingdao 266001 China National Engineering and Technological Research Center of Marine Monitoring Equipment Qingdao 266001 China

Damping is critical for the roll motion response of a ship in waves. A common method for the assessment of damping in a ship’s rolling motion is to perform a free-decay experiment in calm water. In this paper, we propose an approach for estimating nonlinear damping that involves a linear exponential analytical approximation of the experimental roll free-decay amplitudes, fol- lowed by parametric identification based on the asymptotic method. The restoring moment can be strongly nonlinear. To validate this method, we first analyzed numerically simulated roll free-decay data using rolling equations with two alternative parametric forms: linear-plus-quadratic and linear-plus-cubic damping. By doing so, we obtained accurate estimates of nonlinear damping coefficients, even for large initial roll amplitudes. Then, we applied the proposed method to real free-decay data obtained from a scale model of a bulk barrier, and found the simulated results to be in good agreement with the experimental data. Using only free-decay peak data, the proposed method can be used to estimate nonlinear roll-damping coefficients for conditions with a strongly nonlinear restoring moment and large initial roll amplitudes.

关键词： nonlinear roll damping parametric identification nonlinear restoring moment asymptotic method linear exponential approximation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

p-Laplacian Equations on Locally Finite Graphs

引用

Acta Mathematica Sinica,English Series 2021年第11期37卷 1645-1678页

作者： Xiao Li HAN meng Qiu shao Department of Mathematical Sciences Tsinghua UniversityBeijing 100084P.R.China

This paper is mainly concerned with the following nonlinear p-Laplacian equation-△pu(x)+(λa(x)+1)|u|^(p-2)(x)u(x)=f(x,u(x)),in V on a locally finite graph G=(V,E)with more general nonlinear term,whereΔp is the discrete pLaplacian on graphs,p≥*** some suitable conditions on f and a(x),we can prove that the equation admits a positive solution by the Mountain Pass theorem and a ground state solution uλvia the method of Nehari manifold,for anyλ>*** addition,asλ→+∞,we prove that the solution uλconverge to a solution of the following Dirichlet problem{-△pu(x)+|u|^(p-2)(x)u(x)=f(x,u(x)),inΩ,u(x)=0,onδΩwhereΩ={x∈V:a(x)=0}is the potential well and δΩ denotes the the boundary ofΩ.

关键词： p-Laplacian equation locally finite graph ground state solution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Quantum Properties of Two-Mode Squeezed Even and Odd Coherent States

引用

Communications in Theoretical Physics 2007年第2期47卷 317-324页

作者： ZHANG Jing WU Wei meng shao-Ying Department of Physics Laboratory of Atoms and Radiation Liaoning University Shenyang 110036 China

Two new types of quantum states are constructed by applying the operator s（ξ） = exp（ξ＊ ab - ξa＋b＋） on the two-mode even and odd coherent states. The mathematical and quantum statistical properties of such states are investigated. Various nonclassical features of these states, such as squeezing properties, the inter-mode photon bunching, and the violation of Cauchy-Schwarz inequality, are discussed. The Wigner function in these states are studied in detail.

关键词： two-mode squeezed even/odd coherent states quantum statistical properties

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Continuous synthesis of few-layer MoS_(2) with highly electrocatalytic hydrogen evolution

引用

Green Energy & Environment 2021年第6期6卷 858-865页

作者： meng shao Peican Wang Yimeng Wang Baoguo Wang Yundong Wang Jianhong Xu The State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing100084China

As one of the most promising alternative fuels,hydrogen is expected with high *** electrolysis of water is regarded as the cleanest and most efficient method of hydrogen *** disulfide(MoS_(2))is deemed as one of the most promising alternatives HER catalysts owing to its high catalytic activity and low *** continuous production and efficient preparation become the key problems in future industrial *** this work,we first developed a continuous micro-reaction approach with high heat and mass transfer rates to synthesize few-layer MoS_(2)nanoplates with abundant active *** defective MoS_(2)ultrathin nanoplates exhibit excellent HER performance with an overpotential of 260 m V at a current density of 10 m A cm^(-2),small Tafel slope(53.6 m V dec^(-1))and prominent durability,which are comparable to most reported MoS_(2)based *** the existence of continuous devices,it's suitable for the synthesis of MoS_(2)as highperformance electrocatalysts for the industrial water *** novel preparation method may open up a new way to synthesize all two-dimension materials toward HER.

关键词： MoS_(2) Micro-reactor Ultrathin Nanoplates Hydrogen evolution reaction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Efficient Network Dismantling via Node Explosive Percolation

引用

Communications in Theoretical Physics 2019年第6期71卷 764-772页

作者： shao-meng Qin Xiao-Long Ren Lin-Yuan Lü College of Science Civil Aviation University of ChinaTianjin300300China Computational Social Science ETH ZurichClausiusstra■508092 ZurichSwitzerland Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu610065China Alibaba Research Center for Complexity Sciences Hangzhou Normal UniversityHangzhou310027China

The network dismantling problem asks the minimum separate node set of a graph whose removal will break the graph into connected components with the size not larger than the one percentage of the original *** problem has attracted much attention recently and a lot of algorithms have been proposed. However, most of the network dismantling algorithms mainly focus on which nodes are included in the minimum separate set but overlook how to order them for removal, which will lead to low general efficiency during the dismantling process. In this paper,we reformulate the network dismantling problem by taking the order of nodes’ removal into consideration. An efficient dismantling sequence will break the network quickly during the dismantling processes. We take the belief-propagation guided decimation(BPD) dismantling algorithm, a state-of-the-art algorithm, as an example, and employ the node explosive percolation(NEP) algorithm to reorder the early part of the dismantling sequence given by the BPD. The proposed method is denoted as the NEP-BPD algorithm(NBA) here. The numerical results on Erd¨os-R′enyi graphs,random-regular graphs, scale-free graphs, and some real networks show the high general efficiency of NBA during the entire dismantling process. In addition, numerical computations on random graph ensembles with the size from 210 to219 exhibit that the NBA is in the same complexity class with the BPD algorithm. It is clear that the NEP method we used to improve the general efficiency could also be applied to other dismantling algorithms, such as Min-Sum algorithm,equal graph partitioning algorithm and so on.

关键词： network dismantling explosive percolation network robustness feedback vertex set

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Modified Shenlingbaizhu decoction reduces intestinal adenoma formation in adenomatous polyposis coli multiple intestinal neoplasia mice by suppression of hypoxia-inducible factor 1α-induced CD4+CD25+forkhead box P3 regulatory T cells

引用

Journal of Traditional Chinese Medicine 2018年第1期38卷 22-32页

作者： Xu Wenjuan Han Qinrui Liang Shuntian Li Lu shao meng Yao Xueqing Sun Xuegang Department of Traditional Chinese Medicine Nanfang Hospital Southern Medical University Guangzhou 510515 China The Key Laboratory of Molecular Biology State Administration of Traditional Chinese MedicineSchool of Traditional Chinese Medicine Southern Medical University Guangzhou 510515 China School of Chinese Medicine integrated with Western Medicine Binzhou Medical University Yantai 264003 China Department of Gastrointestinal surgery Guangdong General Hospital Guangzhou 510120 China

OBJECTIVE： To test the hypothesis that modified Shenlingbaizhu decoction （MSD） attenuates the for- mation of intestinal adenomas by regulating activa- tion of CD4＋CD25＋ forkhead box P3 （FoxP3） regu- latory T cells （Tregs） by downregulation of hypox- ia-inducible factor la （HIF-la）. METHODS： Chemical fingerprints of ginsenoside Rbl, ginsenoside Rc, paeoniflorin, and dioscin in standard extractions were used as material bases of MSD. Adenomatous polyposis coli multiple intesti- nal neoplasia （ApcM＇n/＋） mice, which harbor a muta- tion in adenomatous polyposis coil, were used to host intestinal adenomas. Peripheral blood and spleen Tregs were analyzed by flow cytometry. Pro- tein expression was analyzed by immunohisto- chemistry and Western blotting. RESULTS： The number and size of intestinal adenomas were significantly reduced by MSD treatment. Mucosal thickening and the spleen size were also substantially decreased by MSD. The carcinogenesis process in Apc^min/＋ mice resembled that of human colorectal cancer. Molecular markers of neoplasms, such as 13-catenin, cyclooxygenase-2, prolif- erating cell nuclear antigen, and p53, were substantially ameliorated by MSD treatment. Moreover, MSD downregulated peripheral and spleen CD4＋ CD25＋FoxP3＋ Tregs and reduced in situ expression of CD4, CD25, and FoxP3 in intestinal adenomas. MSD also suppressed HIF-la expression in the intestinal adenomas, and HIF-la inhibition decreased expression of FoxP3 in Jurkat T cells under hypoxic conditions. CONCLUSION： MSD is a valid prescription to control the formation of intestinal adenomas in Apc^min/＋mice. It exerts anti-cancer effects partially through suppression of HIF-la that induced activation of CD4＋CD25＋FoxP3＋ Tregs in vivo and in vitro.

关键词： Colorectal neoplasms T-lymphocytes, regulatory Hypoxia-inducible factor 1, alpha sub- unit Forkhead transcription factors Modified Shenlingbaizhu decoction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

STOCHASTIC SIMULATION OF TROPICAL CYCLONE TRACKS IN THE NORTHWEST PACIFIC REGION WITH CLASSIFICATION MODEL

引用

Journal of Tropical Meteorology 2020年第1期26卷 47-56页

作者： HUANG Wen-feng LIU Da-wei shao meng-kai School of Civil and Hydraulic Engineering Hefei University of Technology Anhui 230009 China

Accurate simulation of tropical cyclone tracks is a prerequisite for tropical cyclone risk *** the spatial characteristics of tropical cyclone tracks in the Northwest Pacific region,stochastic simulation method based on classification model is used to simulate tropical cyclone tracks in this *** simulation includes the classification method,the genesis model,the traveling model,and the lysis *** cyclone tracks in the Northwest Pacific region are classified into five categories on the basis of its movement characteristics and steering *** the genesis model,Gaussian kernel probability density functions with the biased cross validation method are used to simulate the annual occurrence number and genesis *** traveling model is established on the basis of the mean and mean square error of the historical 6 h latitude and longitude *** termination probability is used as the discrimination standard in the lysis ***,this stochastic simulation method of tropical cyclone tracks is applied and qualitatively evaluated with different *** show that the tropical cyclone tracks in Northwest Pacific can be satisfactorily simulated with this classification model.

关键词： classification model genesis model lysis model traveling model tropical cyclone track

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Bioinspired hierarchical helical nanocomposite macrofibers based on bacterial cellulose nanofibers

引用

National Science Review 2020年第1期7卷 73-83页

作者： Huai-Ling Gao Ran Zhao Chen Cui Yin-Bo Zhu Si-Ming Chen Zhao Pan Yu-Feng meng shao-meng Wen Chuang Liu Heng-An Wu Shu-Hong Yu Division of Nanomaterials & Chemistry Hefei National Laboratory for Physical Sciences at the Microscale CAS Center for Excellence in Nanoscience Hefei Science Center of CAS Department of Chemistry University of Science and Technology of China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics CAS Center for Excellence in Complex System Mechanics University of Science and Technology of China

Bio-sourced nanocellulosic materials are promising candidates for spinning high-performance sustainable macrofibers for advanced applications. Various strategies have been pursued to gain nanocellulose-based macrofibers with improved strength. However, nearly all of them have been achieved at the expense of their elongation and toughness. Inspired by the widely existed hierarchical helical and nanocomposite structural features in biosynthesized fibers exhibiting exceptional combinations of strength and toughness, we report a design strategy to make nanocellulose-based macrofibers with similar characteristics. By combining a facile wet-spinning process with a subsequent multiple wet-twisting procedure, we successfully obtain biomimetic hierarchical helical nanocomposite macrofibers based on bacterial cellulose nanofibers, realizing impressive improvement in their tensile strength, elongation and toughness simultaneously. The achievement certifies the validity of the bioinspired hierarchical helical and nanocomposite structural design proposed here. This bioinspired design strategy provides a potential platform for further optimizing or creating many more strong and tough nanocomposite fiber materials for diverse applications.

关键词： bioinspired nanocomposite hierarchical helical macrofibers strength and toughness bacterial cellulose

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Smith-Purcell radiation improved by multi-grating structure

引用

Chinese Physics B 2022年第4期31卷 320-325页

作者： Jing Shu Ping Zhang Man Liang Sheng-Peng Yang shao-meng Wang Yu-Bin Gong School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 610054China

The photonic crystal structure has attracted much attention due to its ability to confine *** this paper,we present our study on an improved Smith-Purcell radiation from a simple metal photonic crystal excited by moving *** from the wide-band Smith-Purcell radiation from a single metal grating,the results show that the injected electrons could induce more dipole oscillations inside the multi-grating structure,and it leads to the enhancement of the radiation *** addition,there are strong resonances in metal multi-grating structure,and the resonance characteristics may narrow the radiation band,which leads to a radiation with an obvious peak in the ***,the multi-grating structure has the ability to enhance the radiation intensity and shape the radiation frequency *** optimizing the structure parameters,coherent and tunable Smith-Purcell radiation can be realized,and it provides a potential way to develop band-controllable light or THz radiation source.

关键词： Smith-Purcell radiation multi-grating resonance mode

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Amorphous hollow carbon film as a flexible host for liquid Na-K alloy anode

引用

Chinese Chemical Letters 2023年第7期34卷 350-353页

作者： meng shao Ningxiang Wu Tianming Chen Xu Han Yu Shen Weina Zhang Bing Zheng Sheng Li Fengwei Huo Key Laboratory of Flexible Electronics(KLOFE)and Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing 211800China

Compared with solid alkali metal anodes(Li, Na, K), liquid metal anodes(LMAs) could enable high-energy batteries due to their unique advantages, such as self-healing property and no dendrites. Among LMAs,liquid Na-K alloy anode has become a hotspot due to its high theoretical capacity, low redox potential and formation at room temperature(RT). However, it is challenging to utilize liquid Na-K alloy directly and independently as an electrode;and the high surface tension makes it more difficult to immerse into porous current collectors at RT. Herein, an amorphous hollow carbon film(AHCF) consisting of hollow spheres with significant surface defects has been designed to quickly infiltrate Na-K liquid alloy into the hollow carbon film at RT, forming a composite electrode(Na-K@AHCF). The symmetric cell with Na-K@AHCF could exhibit a cycle lifespan up to 400 h at 0.1 m A/cm^(2) and achieve stable stripping/deposition even at 5 mA/cm^(2). When matching with cathode material of sulfurized polyacrylonitrile(SPAN), the obtained K-S full cell exhibits good cycle stability and rate performance.

关键词： Carbon defects Flexible carbon film Na-K alloy Hollow carbon spheres K-S battery

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：