检索结果-南通市图书馆

The Linearized Calderón Problem on Complex Manifolds

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2019年第6期35卷 1043-1056页

作者： Colin GUILLARMOU mikko SALO Leo TZOU Laboratoire de Mathématiques d'Orsay Université Paris-Sud CNRS Université Paris-Saclay Department of Mathematics and Statistics University of Jyv?skyl? School of Mathematics and Statistics University of Sydney

In this note we show that on any compact subdomain of a K?hler manifold that admits sufficiently many global holomorphic functions, the products of harmonic functions form a complete set. This gives a positive answer to the linearized anisotropic Calderón problem on a class of complex manifolds that includes compact subdomains of Stein manifolds and sufficiently small subdomains of K?hler manifolds. Some of these manifolds do not admit limiting Carleman weights, and thus cannot be treated by standard methods for the Calderón problem in higher dimensions. The argument is based on constructing Morse holomorphic functions with approximately prescribed critical points. This extends earlier results from the case of Riemann surfaces to higher dimensional complex manifolds.

关键词： Inverse problem Calderón problem complex manifold

Control of exterior ballistic properties of spin-stabilized bullet by optimizing internal mass distribution

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2019年第1期15卷 38-50页

作者： Janne Lahti Timo Sailaranta mikko Harju Kai Virtanen Systems Analysis Laboratory Department of Mathematics and Systems AnalysisAalto University Aero RD Ltd Systems Analysis Laboratory Department of Mathematics and Systems AnalysisAalto Universit Department of Military Technology National Defence University of Finland

This paper introduces a novel approach for controlling the exterior ballistic properties of spin-stabilized bullets by optimizing their internal mass distributions. Specifically, the properties of interest are the bullets’ stability characteristics that are examined through dynamic and gyroscopic stability *** analytical expressions for aerodynamic quantities are also derived to address the compressibility of air. These expressions are utilized in a bullet model that enables efficient computation of the stability parameters for a given mass distribution. The bullet model is used in the formulation of nonlinear optimization problems that provide optimal mass distributions with respect to given goals, i.e., desired stability characteristics. The bullet types investigated in this paper are a long range bullet and a limited range training bullet. In the optimization of the mass distribution of the long range bullet, the goal is that the bullet stays stable for as long as possible. The mass distribution of the training bullet is optimized such that the bullet is stable at launch but becomes unstable shortly afterwards. The global optimal solutions obtained with the new approach fulfill the desired stability characteristics better than currently used uniformly filled bullets. Overall, the optimization approach reveals a new goal focused philosophy for bullet design compared to current trial and error design practices.

关键词： Aerodynamics Bullet Exterior ballistics Mass properties Optimization Stability

Dynamic ModeⅡfracture behavior of rocks under hydrostatic pressure using the short core in compression(SCC)method

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2021年第5期31卷 927-937页

作者： Wei Yao Ying XuChonglang Wang Kaiwen Xia mikko Hokka State Key Laboratory of Hydraulic Engineering Simulation and Safety School of Civil EngineeringTianjin UniversityTianjin 300072China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Engineering Materials Science Faculty of Engineering and Natural SciencesTampere University(TAU)POB 589FI-33014 TampereFinland Department of Civil&Mineral Engineering University of TorontoTorontoON M5S 1A4Canada

The shear failure of rocks under both a static triaxial stress and a dynamic disturbance is common in deep underground engineering and it is therefore essential for the design of underground engineering to quantitively estimate the dynamic ModeⅡfracture toughness KⅡCof rocks under a triaxial stress ***,the method for determining the dynamic KⅡCof rocks under a triaxial stress has not been developed *** an optimal sample preparation,the short core in compression(SCC)method was designed and verified in this study to measure the dynamic KⅡCof Fangshan marble(FM)subjected to different hydrostatic pressures through a triaxial dynamic testing *** formula for calculating the dynamic KⅡCof the rock SCC specimen under hydrostatic pressures was obtained by using the finite element method in combination with secondary *** experimental results indicate that the failure mode of the rock SCC specimen under a hydrostatic pressure is the shear fracture and the KⅡCof FM increases as the loading *** addition,at a given loading rate the dynamic rock KⅡCis barely affected by hydrostatic *** important observation is that the dynamic fracture energy of FM enhances with loading rates and hydrostatic pressures.

关键词： Loading rate Finite element method ModeⅡfracture toughness Fangshan marble Hydrostatic pressure Short core in compression

Long-term outcomes and quality of life in patients with Hirschsprung disease

在线全文

学校读者我要写书评

暂无评论

World Journal of Pediatric Surgery 2024年第3期7卷 181-186页

作者： mikko P Pakarinen Annika Mutanen Department of Pediatric Surgery University of Helsinki Children's HospitalHelsinkiFinland

Although patients with Hirschsprung disease are mostly affected by imperfect bowel function and fecal control in the long term,they are also predisposed to lower urinary tract symptoms,impaired sexual functions,infertility,psychosocial issues,and decreased quality of ***,but notable comorbidities,which may manifest after childhood,include inflammatory bowel disease and familial medullary thyroid *** frequent occurrence of fecal incontinence and constipation,the overall long-term outlook is quite optimistic as social continence with a good quality of life can be achieved by efficient bowel management also in those affected patients,whose self-coping strategies and medical treatment remain *** dysfunction and other potential long-term complications are best managed by an interdisciplinary specialized approach not overlooking psychosocial issues,which also helps to correctly identify areas requiring continuing input by adult healthcare for young adult patients after *** research is needed to unravel the pathophysiological mechanisms of the long-term bowel dysfunction to identify novel therapeutic targets for development of more efficient innovative management strategies and thereby improvement of quality of life.

关键词： patients impaired life

A CFD study on the hydrodynamic response of a small-scale ice floe induced by a passing ship

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2024年第2期36卷 290-299页

作者： Zongyu Jiang Spyros Hirdaris Sasan Tavakoli mikko Suominen Pentti Kujala Marine and Arctic Technology Department of Mechanical EngineeringAalto UniversityEspooFinland Global Ship Systems Centre ABS Hellenic SM LLC.AthensGreece Department of Infrastructure Engineering The University of MelbourneMelbourneAustralia

A Reynolds averaged Navier-Stokes(RANS)computational fluid dynamics(CFD)model is built to investigate the hydrodynamic response of a circular ice floe under the influence of a passing ship in calm *** ship,mirroring the KRISO Container Ship’s hull design,progresses near an ice floe whose diameter is 30%of the ship’s length and its thickness is 3 *** ship advances at a constant speed,which is handled by using the overset mesh *** study focuses on the ice floe’s motions and the hydrodynamic forces induced by three speeds and three transverse distances of the passing *** reveal that ship-generated wakes notably influence the ice floe’s motions,with a greater influence on sway than ***,the ship’s speed and proximity distinctly affect the ice floe’s motions.

关键词： Hydrodynamics ship-ice interactions ice floe Reynolds averaged Navier-Stokes(RANS)computational fluid dynamics(CFD)

A GIS-based method for the selection of the location of residence

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2012年第1期15卷 61-66页

作者： Xavier ALBACETE Kari PASANEN mikko KOLEHMAINEN Department of Environmental Science Research Group of Environmental InformaticsUniversity of Eastern FinlandYliopistoranta 1 EP.O.Box 162770211 KuopioFinland

Homebuyers are usually interested in both the accessibility of services and the quality of the local environment,and real estate agents frequently offer some web-based systems for home *** is however hardly any information about the quality of local living environment in those web-based *** purpose of this study was to develop a method for homebuyers,adaptable to the environmental variables of interest to homebuyers when selecting a home *** this paper,a multicriteria spatial analysis method is proposed and demonstrated for the homebuyers’selection process,using data from the City of Kuopio,*** spatial variables are applied,including environmental and service factors in the home searching process.A geographical information system(GIS)is used for creating maps for decision variables and mapping suitable *** method for ranking alternative dwellings is based on the difference between levels of the decision variables for each dwelling and the target levels given by the *** method presented in this paper is adaptable to other geographical and social *** decision analysis tool will be useful for both customers and real estate agents,and can also be used for city planning as a participatory-GIS(P-GIS)*** introduces new possibilities in the home selection *** availability of spatial data on the living environment in the webbased services for homebuyers is likely to have effects on customers’requirements and house markets,and also promote better spatial city organization in the long run.

关键词： home selection real estate market living environment GIS

Tensor Tomography: Progress and Challenges

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2014年第3期35卷 399-428页

作者： Gabriel P. PATERNAIN mikko SALO Gunther UHLMANN Department of Pure Mathematics and Mathematical Statistics University of Cambridge Department of Mathematics and Statistics University of Jyvskyl Department of Mathematics University of Washington and University of HelsinkiBox 354350 Seattle Washington 98195-4350 USA

The authors survey recent progress in the problem of recovering a tensor field from its integrals along geodesics. Several open problems are also proposed.

关键词： Inverse problem Integral geometry Tensor tomography

Activation of microbial secondary metabolic pathways:Avenues and challenges

在线全文

学校读者我要写书评

暂无评论

Synthetic and Systems Biotechnology 2018年第3期3卷 163-178页

作者： Bikash Baral Amir Akhgari mikko Metsä-Ketelä Department of Biochemistry University of TurkuFIN-20014TurkuFinland

Microbial natural products are a tremendous source of new bioactive chemical entities for drug *** generation sequencing has revealed an unprecedented genomic potential for production of secondary metabolites by diverse micro-organisms found in the environment and in the *** mining has further led to the discovery of numerous uncharacterized‘cryptic’metabolic pathways in the classical producers of natural products such as Actinobacteria and *** biosynthetic gene clusters may code for improved biologically active metabolites,but harnessing the full genetic potential has been hindered by the observation that many of the pathways are‘silent’under laboratory *** we provide an overview of the various biotechnological methodologies,which can be divided to pleiotropic,biosynthetic gene cluster specific,and targeted genome-wide approaches that have been developed for the awakening of microbial secondary metabolic pathways.

关键词： Biosynthesis Chemical diversity Genome mining Metabolic engineering Synthetic biology

Stochastic geometry based analysis for heterogeneous networks: a perspective on meta distribution

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2020年第12期63卷 230-250页

作者： Xinlei YU Qimei CUI Yuanjie WANG Na LI Xiaofeng TAO mikko VALKAMA National Engineering Laboratory for Mobile Network Technologies Beijing University of Posts and Telecommunications National Computer Network Emergency Response Technical Team/Coordination Center of China (CNCERT/CC) Department of Electrical Engineering Tampere University

The meta distribution as a new performance metric can provide much more fine-grained information about the individual link reliability, and is of great value for the analysis and design of the future cellular networks. In this paper, we investigate the stochastic geometry based analysis for heterogeneous networks from the perspective on the meta distribution. The comprehensive overview for the fundamental framework of the meta distribution is provided, which involves the concepts of the meta distribution and its related performance metric(e.g., mean local delay and spatial outage capacity) and the efficient calculation methods of the meta distribution. The insights of the meta distribution are also stated by the comparison with standard success probability. The various applications of the meta distribution to heterogeneous networks are summarized and categorized by different types of technologies. Furthermore, some open issues and future work are discussed to promote the development and application of the meta distribution.

关键词： meta distribution stochastic geometry heterogeneous network success probability per-link reliability