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Regularity for 3D Navier–Stokes Equations Based on Energy Distribution at Wavenumber Bands

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Acta Mathematica Sinica,English Series 2019年第8期35卷 1377-1392页

作者： myong-hwan ri Institute of Mathematics State Academy of SciencesDPR Korea

We present some regularity criteria for the Leray–Hopf weak solutions to the Cauchy problem for 3D Navier–Stokes equations based on energy distribution at wavenumber bands. We show sufficient conditions for regularity based on the ratios of energy dissipation rates at sufficiently high wavenumber bands and neighboring medium wavenumber bands. Moreover, we give a regularity criterion based on relations between energy at high and low wavenumber bands.

关键词： Navier-Stokes equations global regularity energy transfer

MAXIMAL L^(1)-REGULAriTY OF GENERATORS FOR BOUNDED ANALYTIC SEMIGROUPS IN BANACH SPACES

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Acta Mathematica Scientia 2022年第4期42卷 1261-1272页

作者： myong-hwan ri Reinhard FARWIG Institute of Mathematics State Academy of SciencesPyongyangDPR Korea Department of Mathematics Darmstadt University of TechnologyGermany

In this paper,we prove that the generator of any bounded analytic semigroup in(θ,1)-type real interpolation of its domain and underlying Banach space has maximal L^(1)-regularity,using a duality argument combined with the result of maximal continuous *** an application,we consider maximal L^(1)-regularity of the Dirichlet-Laplacian and the Stokes operator in inhomogeneous B_(q),^(s),1-type Besov spaces on domains of R^(n),n≥2.

关键词： Maximal L^(1)-regularity sectorial operator Stokes operator

低空经济助推新质生产力的运行机理与路径选择

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新疆师范大学学报（哲学社会科学版） 2025年第1期46卷 118-131页

作者：欧阳日辉中央财经大学中国互联网经济研究院北京100081

低空经济是以低空飞行活动为牵引,以有人驾驶和无人驾驶航空器为主要载体,通过技术创新和模式创新推动相关产业融合发展的新型综合性经济形态。低空经济涉及领域和行业多、应用场景多、创新之处多、产业链条长、带动效应强,具有创新驱... 详细信息

低空经济是以低空飞行活动为牵引,以有人驾驶和无人驾驶航空器为主要载体,通过技术创新和模式创新推动相关产业融合发展的新型综合性经济形态。低空经济涉及领域和行业多、应用场景多、创新之处多、产业链条长、带动效应强,具有创新驱动性、空间依赖性、跨界融合性、辐射带动性等技术—经济特征。低空经济通过场景牵引、跨界融合、协同治理,聚焦应用场景,打造低空多场景应用,推动“低空+”物流配送、“低空+”城市空中交通、“低空+”旅游、“低空+”应急救援等规模化发展,在技术创新与制度创新相互嵌套、协同治理的基础上实现健康发展。当前,各地各部门积极抢占低空经济新赛道,通过建设智能互联高效的基础设施、加快低空智能互联航行技术创新、完善产业链增强低空产业韧性和安全等举措因地制宜打造融合创新的应用场景。为促进低空经济发展,应加强产业政策引导与支持,支持低空经济技术创新与研发,推动跨界融合与应用场景创新,完善产业链配套服务体系。

关键词：低空经济新质生产力应用场景科技创新产业创新

Analytical solution for one-dimensional nonlinear consolidation of saturated multi-layered soil under time-dependent loading

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Journal of Ocean Engineering and Science 2021年第1期6卷 21-29页

作者： Pyol Kim Hyong-Sik Kim Chol-U Pak Chung-Hyok Paek Gun-Hyang ri Hak-Bom myong Faculty of Geology Kim Il Sung UniversityPyongyang 999093Democratic People’s Republic of Korea

This paper presents analytical solutions for one-dimensional nonlinear consolidation of saturated multi-layered soil under time-dependent *** solutions are derived for one-dimensional nonlinear consolidation of multi-layered soil subjected to constant loading and ramp *** proposed solutions are verified through the comparison with the existing solutions for double-layered soil and singlelayered soil,which shows the proposed solutions are more general ones for one-dimensional nonlinear consolidation of saturated soils subjected to time-dependent *** on the proposed solutions,nonlinear consolidation behavior of saturated multi-layered soil under time-dependent loading is investigated.

关键词： Saturated soil Multi-layered Nonlinear consolidation Analytical solution

The Coupled Model Predictability of the Western North Pacific Summer Monsoon with Different Leading Times

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Atmospheric and Oceanic Science Letters 2012年第3期5卷 219-224页

作者： LU ri-Yu LI Chao-Fan Se-hwan YANG Buwen DONG State Key Laboratory of Numerical Modelling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences National Centre for Atmospheric Science-Climate Department of Meteorology University of Reading Reading United Kingdom

Leading time length is an important issue for modeling seasonal forecasts. In this study, a comparison of the interannual predictability of the Western North Pacific (WNP) summer monsoon between different leading months was performed by using one-, four-, and sevenmonth lead retrospective forecasts (hindcasts) of four coupled models from Ensembles-Based Predictions of Climate Changes and Their Impacts (ENSEMBLES) for the period of 1960 2005. It is found that the WNP summer anomalies, including lower-tropospheric circulation and precipitation anomalies, can be well predicted for all these leading months. The accuracy of the four-month lead prediction is only slightly weaker than that of the one-month lead prediction, although the skill decreases with the increase of leading months.

关键词： seasonal forecast leading month Western North Pacific coupled models ENSEMBLES

Assessing cooling energy reduction potentials by retrofitting traditional cavity walls into passively ventilated cavity walls

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Building Simulation 2021年第4期14卷 1295-1309页

作者： ri Na Zhigang Shen Department of Civil and Environmental Engineering University of DelawareNewarkDE19716USA The Durham School of Architecture Engineering and Construction University of Nebraska LincolnLincolnNE68588USA

A major roadblock in achieving substantial building energy reduction is the low performance of old buildings that account for a significant portion of the building energy *** low-cost energy retrofit solutions that do not disrupt occupants’daily life during the retrofitting is the key to successful building energy retrofit *** this paper,a novel and low-cost exterior wall retrofitting solution is introduced,and its performance in reducing space cooling load was quantitatively evaluated to demonstrate its feasibility and *** primary goal of this paper is to provide a quantitative assessment of the cooling-energy savings potential by using the proposed new wall *** intended retrofitting targets are the large amount of existing cavity-wall buildings located in hot climate *** quantification of the before-after heat-flux reduction was conducted through a 3-dimensional steady-state low turbulence computational fluid dynamics(CFD)model,which is validated by benchmarking its prediction against the published experimental case *** outcomes of the investigation suggest that this simple low-cost solution has great potentials in reducing buildings’summer cooling load in hot climate *** applicability of this solution is not limited to retrofitting existing *** energy-efficient building designs can also adopt this solution in their envelope systems.

关键词： low-cost energy retrofit building envelope cavity wall stack effect space cooling energy reduction CFD

First-principles simulation and experimental evidence for improvement of transmittance in ZnO films

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Progress in Natural Science:Materials International 2011年第1期21卷 40-45页

作者： ri-ichi MURAKAMI Department of Mechanical Engineering The University of Tokushima2-1 Minamijosanjima-choTokushima 770-8506Japan

ZnO/Ag/Glass films were prepared by a DC magnetron sputtering system,which exhibit both excellent properties of high conductivity and high ***,an enhancement of transmission of ZnO films was observed after brought into contact to a silver layer,but the understanding of experimental findings for the enhancement of transmission was ***,the first-principles simulations of electrical and optical properties were utilized using the density functional theory with local-density approximations or generalized-gradient *** crystal structure of ZnO or Ag was imported from the Material Studio *** periodic supercell has the same atomic ratio with the experimental structure and was optimized using the CASTEP package in Material *** to the calculation results,the enhancement in transmission is attributed to the surface plasmon polariton in the asymmetric structure films.

关键词： first-principles transparent conductive oxide ZnO transmittance surface plasmon polaritons

Solitary Peutz-Jeghers-type appendiceal hamartomatous polyp growing into the terminal ileum

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World Journal of Gastroenterology 2014年第16期20卷 4822-4826页

作者： Chang In Choi Dae hwan Kim Tae Yong Jeon Dong Heon Kim Na ri Shin Do Youn Park Department of Surgery Medical Research InstitutePusan National University HospitalSeo-GuBusan 602-739South Korea Department of Pathology Medical Research InstitutePusan National University HospitalSeo-GuBusan 602-739South Korea

Solitary Peutz-Jeghers type hamartomatous polyp is *** is considered to be related to a variant PeutzJeghers syndrome(PJS)and may be a separate disease entity.A 50-year-old man was referred to our hospital with a diagnosis of intussusception in the terminal ileum and underwent segmental ileal resection with *** identified a 3.5-cm diameter polyp arising from the appendix with ingrowth into the terminal *** polyp was confirmed to be a hamartomatous polyp of Peutz-Jeghers-type,***,the patient had no characteristic manifestations of PJS such as mucocutaneous pigmentation and family *** are few reports of appendiceal hamartomatous polyp in PJS patients and solitary appendiceal hamartomatous polyp is even ***,rather than telescoping,ours is the first reported intussuscepted lesion,to the best of our knowledge.

关键词： Peutz-Jeghers syndrome Hamartomatous intestinal polyposis Neoplasms Intussusception Intestinal obstruction

Cosmological constraints on the background dynamics of a two-field nonsingular bounce model

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Chinese Physics C 2024年第11期48卷 149-155页

作者： Kang Song ri Sin Chol hwang Hyon Chol ri Department of Physics Kim Il Sung UniversityRyongnam DongTaesong District PyongyangDemocratic People's Republic of Korea

In this study,we consider a nonsingular two-field bounce scenario with non-minimal kinetic coupling between two scalar *** derive constraints on the model parameters from the finiteness of the physical quantities at the classical level and from the relation between the late-time accelerated expansion and particle production up to the bounce *** then determine the allowed parameter space for the model.

关键词： bounce universe parameter space