检索结果-南通市图书馆

Three-Dimensional Wave-Induced Current Model Equations and Radiation Stresses

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2017年第4期31卷 418-427页

作者： xia Hua-yong South China Sea Marine Forecast Center State Oceanic administrationGuangzhou 510300China

After the approach by Mellor （2003, 2008）, the present paper reports on a repeated effort to derive the equations for three-dimensional wave-induced current. Via the vertical momentum equation and a proper coordinate transformation, the phase-averaged wave dynamic pressure is well treated, and a continuous and depth-dependent radiation stress tensor, rather than the controversial delta Dirac function at the surface shown in Mellor （2008）, is provided. Besides, a phase-averaged vertical momentum flux over a sloping bottom is introduced. All the inconsistencies in Mellor （2003, 2008）, pointed out by Ardhuin et al. （2008） and Bennis and Ardhuin （2011）, are overcome in the presently revised equations. In a test case with a sloping sea bed, as shown in Ardhuin et al. （2008）, the wave-driving forces derived in the present equations are in good balance, and no spurious vertical circulation occurs outside the surf zone, indicating that Airy’s wave theory and the approach of Mellor （2003, 2008） are applicable for the derivation of the wave-induced current model.

关键词： sea surface wave wave-induced current radiation stress vertical wave momentum flux

虎符铜砭循经刮痧联合皮肤再生技术治疗WagnerⅠ~Ⅲ级糖尿病足临床观察

在线全文

学校读者我要写书评

暂无评论

中国中医药现代远程教育 2025年第2期23卷 129-131,178页

作者：张霞杨玲连云港市赣榆区中医院老年科江苏连云港222100

目的分析虎符铜砭循经刮痧联合皮肤再生技术治疗WagnerⅠ~Ⅲ级糖尿病足的临床效果。方法选取江苏省连云港市赣榆区中医院老年科2020年3月—2022年10月收治的80例WagnerⅠ~Ⅲ级糖尿病足患者,利用抛币法分为两组,各40例。对照组采取传统治... 详细信息

目的分析虎符铜砭循经刮痧联合皮肤再生技术治疗WagnerⅠ~Ⅲ级糖尿病足的临床效果。方法选取江苏省连云港市赣榆区中医院老年科2020年3月—2022年10月收治的80例WagnerⅠ~Ⅲ级糖尿病足患者,利用抛币法分为两组,各40例。对照组采取传统治疗,观察组采取虎符铜砭循经刮痧联合皮肤再生技术治疗。分别在治疗前、治疗1个月后利用临床症状体征分级标准评分表测定临床症状体征积分,统计创面愈合指标以及治疗总有效率并进行对比。结果观察组创面愈合指标、治疗1个月后的临床症状体征积分优于对照组(P<0.05),治疗总有效率为100.00%(40/40),高于对照组的92.50%(37/40)(P<0.05)。结论在WagnerⅠ~Ⅲ级糖尿病足患者临床治疗中,虎符铜砭循经刮痧联合皮肤再生技术效果确切,能促进创面愈合及改善临床症状体征,可作为预选治疗方案推广使用。

关键词：脱疽糖尿病足虎符铜砭循经刮痧疗法皮肤再生技术

Network traffic identification in packet sampling environment

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Digital Communications and Networks 2023年第4期9卷 957-970页

作者： Shi Dong Yuanjun xia School of Computer Science and Technology Zhoukou Normal UniversityZhoukou466001China School of Computer and Information Security Guilin University of Electronic TechnologyGuilin 541004China

With the rapid growth of network bandwidth,traffic identification is currently an important challenge for network management and *** recent years,packet sampling has been widely used in most network management *** this paper,in order to improve the accuracy of network traffic identification,sampled NetFlow data is applied to traffic identification,and the impact of packet sampling on the accuracy of the identification method is *** study includes feature selection,a metric correlation analysis for the application behavior,and a traffic identification *** analysis and experimental results show that the significance of behavior characteristics becomes lower in the packet sampling ***,in this paper,the correlation analysis results in different trends according to different ***,as long as the flow number meets the statistical requirement,the feature selection and the correlation degree will be independent of the sampling *** in a high sampling ratio,where the effective information would be less,the identification accuracy is much lower than the unsampled ***,in order to improve the accuracy of the identification,we propose a Deep Belief Networks Application Identification(DBNAI)method,which can achieve better classification performance than other state-of-the-art methods.

关键词： Network measurement Application identification Packet sampling Application behavior characteristic Metric correlation Network management

A new era of flood control strategies from the perspective of managing the 2020 Yangtze River flood

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2021年第1期64卷 1-9页

作者： Jun xia Jin CHEN State Key Laboratory of Water Resources and Hydropower Engineering Sciences Wuhan UniversityWuhan 430072China Wuhan University Yangtze River Academy of SciencesChangjiang Water Resources Commission of the Ministry of Water ResourcesWuhan 430015China

Flood control of the Yangtze River is an important part of China’s national water *** July 2020,due to continuous heavy rainfall,the water levels along the middle-lower reaches of the Yangtze River and major lakes constantly exceeded the warning levels,in which Taihu Lake exceeded its highest safety water level and some stations of Poyang Lake reached their highest water levels in its *** August 2020,another huge flood occurred in the Minjiang River and the Jialing River in the upper Yangtze River,and some areas of Chongqing Municipality and other cities along the rivers were inundated,resulting in great pressure on flood control and high disaster *** 2020 Yangtze River flood has received extensive media coverage and raised concerns on the roles of the Three Gorges Dam and other large reservoirs in flood *** we analyze the changes in the pattern of the Yangtze River flood control by comparing the strategies to tackle the three heavy floods occurring in 1954,1998,and *** propose that the overall strategy of the Yangtze River flood control in the new era should adhere to the principle of"Integration of storage and drainage over the entire Yangtze River Basin,with draining floods downstream as the first priority"by using both engineering and non-engineering *** the basis of embankments,the engineering measures should use the Three Gorges Dam and other large reservoirs as the major regulatory means,promote the construction of key flood detention areas,keep the floodways clear,and maintain the ecosystem services of wetlands and *** terms of non-engineering measures,we should strengthen adaptive flood risk management under climate change,standardize the use of lands in flood detention areas,give space to floods,and promote the implementation of flood risk maps and flood insurance *** ultimate goal of this new flood control system is to enhance the adaptability to frequent floods and increase the resilience to extre

关键词： The 2020 Yangtze River flood Yangtze River Flood Control System Three Gorges Dam Protection of wetlands and shoals Non-engineering measures

Computational modelling of gas–liquid–solid multiphase free surface flow with and without evaporation

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第7期90卷 218-235页

作者： Huihuang xia Marc Kamlah Institute for Applied Materials(IAM) Karlsruhe Institute of Technology(KIT)Hermann-von Helmholtz-Platz 176344 Eggenstein-LeopoldshafenGermany

Gas–liquid–solid multiphase systems are ubiquitous in engineering applications,*** printing,spray drying and *** a numerical framework for modelling these multiphase systems is of great *** improved,resolved computational fluid dynamics-discrete element method(CFD-DEM)framework is developed to model the multiphase free surface flow with and without *** improved capillary force model is developed to compute the capillary interactions for partially floating particles at a free *** well-known benchmark cases,namely drag coefficient calculation,the single sphere settling,and drafting-kissing-tumbling of two particles are conducted to validate the resolved CFD-DEM *** turns out that the resolved CFD-DEM model developed in this paper can accurately calculate the fluid–solid interactions and predict the trajectory of solid particles interacting with the liquid *** demonstrations,namely two particles moving along a free surface when the liquid phase evaporates,and particle transport and accumulations inside an evaporating sessile droplet show the performance of the resolved model.

关键词： Capillary force Discrete element method Liquid bridge Particle transport Resolved CFD-DEM Volume of fluid

Spinel Li Mn_(2)O_(4)integrated with coating and doping by Sn self-segregation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2022年第5期29卷 909-916页

作者： Huaifang Shang Dingguo xia Key Laboratory of Magnetic Molecules and Magnetic Information Materials(Ministry of Education) School of Chemistry and Material ScienceShanxi Normal UniversityTaiyuan 030031China Beijing Key Laboratory of Theory and Technology for Advanced Batteries Materials School of Materials Science and EngineeringPeking UniversityBeijing 100871China

The development of high-performance and low-cost cathode materials is of great significance for the progress in lithium-ion *** use of Co and even Ni is not conducive to the sustainable and healthy development of the power battery industry owing to their high cost and limited ***,we report LiMn_(2)O_(4)integrated with coating and doping by Sn *** electron energy spectrum and soft X-ray absorption spectrum show that the coating is Sn-rich LiMn_(2)O_(4),with a small Sn doping in the bulk *** integration strategy can not only mitigate the Jahn–Teller distortion but also effectively avoid the dissolution of *** as-obtained product demonstrates superior high initial capacities of 124 mAh·g^(-1)and 120 mAh·g^(-1)with the capacity retention of 91.1%and 90.2%at 25℃and55℃after 50 cycles,*** novel material-processing method highlights a new development direction for the progress of cathode materials for lithium-ion batteries.

关键词： spinel lithium manganate coating and doping tin self-segregation high capacity good stability

Nitrogen-,phosphorus-doped carbon-carbon nanotube CoP dodecahedra by controlling zinc content for high-performance electrocatalytic oxygen evolution

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2020年第6期39卷 680-687页

作者： xia-xia Li Pei-Yao Zhu Qing Li Yu-xia Xu Yan Zhao Huan Pang School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China Guangling College Yangzhou UniversityYangzhou 225000China College of Chemistry and Materials Science Sichuan Normal UniversityChengdu 610068China

Here,N-and P-doped carbon-carbon nanotube CoP(NPC-CNTs-CoP)nanoparticles dodecahedra are achieved by multistep calcination of the Zn-doped zeolitic imidazolate framework ZIF-67 precursor(ZnCo-ZIF).In the structures,the presence of N and P atoms,abundant CNTs and the CoP nanoparticles can enhance electrochemical activity and promote the structural stability of *** the temperature increases,the Zn contents gradually reduce to zero,which provides more active sites for electrochemical ***,the high specific surface area and microporous behavior of NPC-CNTsCoP-9 make it excellent in electrocatalytic ***-CoP-9 shows a low overpotential of 224 mV at10 mA·cm^-2 in 1.0 mol·L^-1 KOH *** strategy of zeolitic imidazole framework-derived transition metal phosphides will provide a new sight for developing energy conversion materials.

关键词： Nitrogen Phosphorus Carbon Carbon nanotube CoP Oxygen evolution

Simulation of plasma behavior for medium propellant mass and pulsed energy of small scale pulsed inductive thruster

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2020年第1期33卷 176-190页

作者： Yuguo CHENG Guangqing xia PLA 91550 Element 41 Dalian 116023China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116024China Key Laboratory of Advanced Technology for Aerospace Vehicles of Liaoning Province Dalian University of TechnologyDalian 116024China

The pulsed inductive thruster is characterized of no electrode corruption and wide propellant *** give insight into the propulsion mechanism of small scale thruster at different propellant mass(m)and energy(E)levels,the transient Magneto Hydro Dynamics(MHD)method,completed by high temperature thermodynamic and transport,and plasma electrical models,is developed to study argon plasma response under the excitation of current of high rise *** calculating the two-dimensional expansion properties of the thruster with conical pylon,the simulations find that the main energy deposition occurs during the initial pulse rise stage,and the energy density of Joule heat is two magnitudes higher than the deposition in the down *** propellant mass of 2 mg,average axial velocity of the current sheet increases from about 15 km/s at 750 J to about 21 km/s at 1470 J within the decoupling *** velocity variation synchronizes with the pulsed rise in the *** monotonically decrease of the temperature along axis results in the growth of low ionization level ions and reducing of high *** current sheet maintains the structure formed during the initial pulse rise when moving beyond the decoupling *** the change in forward velocity,the main difference is the dimension compared with that in the first half period,caused by thermal conduction and particle *** variations of total impulse It in the range of m from 2 mg to8 mg and E from 750 J to 1470 J show that It is proportional to m1/2 when E is determined.

关键词： Expansion properties Flow field Magneto Hydro Dynamics(MHD)method Pulsed inductive plasma Total impulse

Seasonal thermal energy storage using natural structures:GIS-based potential assessment for northern China

在线全文

学校读者我要写书评

暂无评论

Building Simulation 2024年第4期17卷 561-574页

作者： Yichi Zhang Jianjun xia Midea HVAC Heating&Ventilation Equipment Co. LtdFoshan528311China Building Energy Research Center Tsinghua UniversityBeijing100084China

Seasonal thermal energy storage(STES)allows storing heat for long-term and thus promotes the shifting of waste heat resources from summer to winter to decarbonize the district heating(DH)*** being a promising solution for sustainable energy system,large-scale STES for urban regions is lacking due to the relatively high initial investment and extensive land *** close the gap,this study assesses the potentials of using two naturally available structures for STES,namely valley and ground pit *** on geographical information system(GIS)methods,the available locations are searched from digital elevation model and selected considering several criteria from land uses and construction *** costs of dams to impound the reservoir and the yielded storage capacities are then quantified to guide the choice of suitable *** assessment is conducted for the northern China where DH systems and significant seasonal differences of energy demand *** total,2,273 valley sites and 75 ground pit sites are finally identified with the energy storage capacity of 15.2 billion GJ,which is much larger than the existing DH demand in northern *** results also prove that 682 valley sites can be achieved with a dam cost lower than 20 CNY/m^(3).By conducting sensitivity analysis on the design dam wall height and elevations,the choices of available natural structures are expanded but practical issues about water pressures and constructions are also ***,the identified sites are geographically mapped with nearest urban regions to reveal their roles in the DH *** general,560 urban regions are found with potential STES units and most of them have STES storage capacities larger than their own DH *** novel planning methodology of this study and publicly available datasets create possibilities for the implementations of large-scale STES in urban DH systems.

关键词： seasonal thermal energy storage geographical information system district heating water reservoir