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Performance of GPS slant tot.l.electron content and IRI-Plas-StEC for days with ionospheric disturbance

Geodesy and Geodynamics 2016年第1期7卷 1-10页

作者： Feza Arikan Seymur Shukurov Hakan tuna Orhan Arikan t.l. Gulyaeva Department of Electrical and Electronics Engineering Hacettepe University Beytepe Ankara 06800 Turkey Department of Electrical and Electronics Engineering Bilkent Uniuersity Bilkent Ankara 06800 Turkey IZMIRAN Moscow 142190 Troitsk Russian Federation

tot.l.Electron Content （tEC） is an important observable parameter of the ionosphere which forms the main source of error for space based navigation and positioning systems. Since the deployment of Global Navigation Sat.l.ite Systems （GNSS）, cost-effective esti- mation of tEC between the earth based receiver and Global Positioning System （GPS） sat- ellites became the major means of investigation of local and regional disturbance for earthquake precursor and augmentation system studies. International Reference Iono- sphere （IRI） extended to plasmasphere （IRI-Plas） is the most developed ionospheric and plasmaspheric climatic model that provides hourly, mont.l. median of electron density distribution globally. Recently, IONOlAB group {***） has presented a new online space weather service that can compute slant tEC （StEC） on a desired ray path for a given date and time using IRI-Plas model （IRI-Plas-StEC）. In this study, the performance of the model based StEC is compared with GPS-StEC computed according to the estimation method developed by the IONOlAB group and includes the receiver bias as IONOlAB-BIAS （IONOlAB-StEC）. Using Symmetric Kullback-leibler Distance （SKlD）, Cross Correlation （CC） coefficient and the metric norm （l2N） to compare IRI-Plas-StEC and IONOlAB-StEC for the month of October 2011 over the turkish National Permanent GPS Network （tNPGN- Active）, it has been observed that SKlD provides a good indicator of disturbance for both earthquakes and geomagnetic storms.

关键词： Ionospheretot.l.Electron Content (tEC)GPSIRI-Plas

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Automatic tracing and Segmentation of Rat Mammary Fat Pads in MRI Image Sequences Based on Cartoon-texture Model

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transactions of tianjin University 2009年第3期15卷 229-235页

作者：涂圣贤张素陈亚珠 Freedman Matthew t wang Bin XUAN jason wang Yue Department of Biomedical Engineering Shanghai Jiao Tong University Shanghai 200240 China Department of Oncology Lombardi Comprehensive Cancer Center Georgetown University Washington DC 20057 USA Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Arlington VA 22203 USA

the growth patterns of mammary fat pads and glandular tissues inside the fat pads may be related with the risk factors of breast *** measurements of this relationship are available after segmentation of mammary pads and glandular *** fat pads may lose continuity along image sequences or adjoin similar intensity areas like epidermis and subcutaneous regions.A new approach for automatic tracing and segmentation of fat pads in magnetic resonance imaging(MRI) image sequences is presented,which does not require that the number of pads be constant or the spatial location of pads be adjacent among image ***,each image is decomposed into cartoon image and texture image based on cartoon-texture *** will be used as smooth image and feature image for segmentation and for targeting pad seeds,***,two-phase direct energy segmentation based on Chan-Vese active contour model is applied to partitioning the cartoon image into a set of regions,from which the pad boundary is traced iteratively from the pad seed.A tracing algorithm based on scanning order is proposed to accurat.l. trace the pad boundary,which effectively removes the epidermis attached to the pad without any post processing as well as solves the problem of over-segmentation of some small holes inside the *** experiment.l.results demonstrate the ut.l.ty of this approach in accurate delineation of various numbers of mammary pads from several sets of MRI images.

关键词： active contours cartoon-texture model tracing boundary sequential images segmentation

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Beginning from the end:the presynaptic terminal as a pathomechanism hub in frontotemporal dementia and amyotrophic lateral sclerosis

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Neural Regeneration Research 2025年第11期20卷 3217-3218页

作者： laura Huggon Emma l.Clayton UK Dementia Research Institute at King’s College london LondonUK Department of Basic and Clinical Neuroscience Institute of Psychiatry Psychology&NeuroscienceKing’s College LondonLondonUK

Frontotemporal dementia and amyotrophic lateral sclerosis:Frontotemporal dementia(F t D)and amyo t rophic lateral sclerosis(AlS)are neurodegenerative diseases with significant overlapping *** these neurodegenerative diseases affect different neuronal populations(with FtD affecting neurons of the front.l.and temporal lobes,and AlS affecting upper and lower motor neurons),these two diseases are complexly *** and AlS exist on a disease spectrum,with shared genetic causes,clinical presentations,and pathologies.

关键词： diseases amyotrophic sclerosis

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Nonplanar flow-induced vibrations of a cant.l.vered PIP structure system concurrently subjected to internal and cross flows

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Acta Mechanica Sinica 2019年第6期35卷 1241-1256页

作者： Z.Y.liu t.l.Jiang l.wang H.l.Dai Department of Mechanics Huazhong University of Science and TechnologyWuhan 430074China Hubei Key laboratory for Engineering Structural Analysis and Safety Assessment Wuhan 430074China

Pipe-in-pipe(PIP)structures are widely used in offshore oil and gas pipelines to set.l. thermal insulation issues.A PIP structure system usually consists of two concentric pipes and one softer layer for thermal insulation *** tot.l.response of the system is related to the dynamics of both pipes and the interactions between these two concentric *** the current work,a theoretical model for flow-induced vibrations of a PIP structure system is proposed and analyzed in the presence of an internal axial flow and an external cross *** interactions between the two pipes are modeled by a linear distributed damper,a linear distributed spring and a nonlinear distributed spring along the pipe *** unsteady hydrodynamic forces due to cross flow are modeled by two distributed van der Pol wake *** nonlinear partial differential equations for the two pipes and the wake are further discretized by the aid of Galerkin’s technique,resulting in a set of ordinary differential *** ordinary differential equations are further numeri cally solved by using a fourth-order Runge-Kutta integration *** portraits,bifurcation diagrams,an Argand diagram and oscillation shape diagrams are plotted,showing the existence of a lock-in phenomenon and figure-of-eight *** PIP system subjected to cross flow displays some interesting dynamical behaviors different from that of a single-pipe structure.

关键词： Cant.l.vered PIP structure theoretical model Flow-induced vibration Cross flow Internal flow

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Revealing the seismicity increase in interrelationships in various seismic zones in Uzbekistan as a case study

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Geodesy and Geodynamics 2015年第5期6卷 351-360页

作者： Artifeou t.U. Ibragimov R.S. Ibragimova t.l. Mirzaev M.A. Artikov M.t. Institute of Seismology

A new research method was developed to investigate the influence of an increase in seismicity from one zone on the increase in other zones nearby. By applying the developed method to each main seismic zone in Uzbekistan, we specify the external seismic zone activation, which has the greatest impact on activation within the research zone. We also identify each external seismic zone characterized by high seismic activity and large seismic potential that has the greatest impact on each seismic zone in Uzbekistan.

关键词： External seismic zoneInternal seismic zoneSeismicitySeismic energyEarthquakeInterrelationship

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Magneto optics and time resolved terahertz spectrocopy

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Chinese Physics B 2018年第7期27卷 112-119页

作者： t Dong Z G Chen N l wang International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Institute of Physics Chinese Academy of SciencesBeijing 100190China

Exploring, manipulating, and understanding new exotic quantum phenomena in condensed-matter systems have gen- erated great interest in the scientific community. Static and time resolved optical spectroscopies after photoexcitations are important experiment.l.tools for probing charge dynamics and quasiparticle excitations in quantum materials. In Syner- getic Extreme Condition User Facility （SECUF）, we shall construct magneto-infrared and terahertz measurement systems and develop a number of ultrafast femtosecond laser based systems, including intense near to mid-infrared pump terahertz probe. In this article, we shall describe several systems to be constructed and developed in the facilities, then present some examples explaining the application of magneto optics and time resolved spectroscopy techniques.

关键词： magneto-optics infrared spectroscopy mid-infrared pump terahertz probe

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Astrocytic role of thy-1 induced inhibition of axonal sprouting

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Neural Regeneration Research 2021年第6期16卷 1192-1193页

作者： Sara t.Whiteman jason M.Askvig Department of Biology Concordia CollegeMoorheadMNUSA

thy-1 as an“anti-sprouting”factor:Since the identification of thy-1(CD-90)in 1964 by Reif and Allen,the precise functions of this glycosyl phosphatidylinosit.l.anchored surface protein within the central nervous system have been difficult to ***-1 is a 110-amino acid cellular adhesion molecule that plays a role in cell-cell communication by interacting with other cellular adhesion molecules,including integrins(leyton et al.,2001).While found on a diverse array of cells within the body,thy-1 is present on the surface of almost every neuron in the brain(Morris and Grosveld,1989).

关键词： precise system interacting

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Interaction of obesity and inflammatory bowel disease

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World Journal of Gastroenterology 2016年第35期22卷 7868-7881页

作者： jason W Harper timothy l Zisman Department of Gastroenterology Swedish Medical CenterWA 98195United States Inflammatory Bowel Disease Program Division of GastroenterologyUniversity of Washington Medical CenterSeattleWA98195 United States

Inflammatory bowel disease(IBD) is a chronic inflammatory condition of unknown etiology that is thought to result from a combination of genetic, immunologic and environment.l.factors. the incidence of IBD has been increasing in recent decades, especially in developing and developed nations, and this is hypothesized to be in part related to the change in dietary and lifest.l. factors associated with modernization. the prevalence of obesity has risen in parallel with the rise in IBD, suggesting a possible shared environment.l.link between these two conditions. Studies have shown that obesity impacts disease development and response to therapy in patients with IBD and other autoimmune conditions. the observation that adipose tissue produces pro-inflammatory adipokines provides a potential mechanism for the observed epidemiologic links between obesity and IBD, and this has developed into an active area of investigative inquiry. Additionally, emerging evidence highlights a role for the intestinal microbiota in the development of both obesity and IBD, representing another potential mechanistic connection between the two conditions. In this review we discuss the epidemiology of obesity and IBD, possible pathophysiologic links, and the clinical impact of obesity on IBD disease course and implications for management.

关键词： Inflammatory bowel disease Crohn’s disease Ulcerative colitis Obesity Body mass index

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Generation of brain vascular heterogeneity:recent advances from the perspective of angiogenesis

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Neural Regeneration Research 2025年第7期20卷 2013-2014页

作者： Nathanael J.lee Ryota l.Matsuoka Department of Neurosciences Lerner Research InstituteCleveland ClinicClevelandOHUSA Department of Molecular Medicine Cleveland Clinic Lerner College of MedicineCase Western Reserve UniversityClevelandOHUSA

Heterogeneous proper t i es of vascular endothelial cells in the brain:the brain displays large energy dynamics and consumption,and this high level of metabolic demands is fulfilled by a continuous supply of glucose and oxygen through its vascular *** vasculature consists of highly divergent blood vessel branches,giving rise to a dense network of capillaries that supply blood to all cells across the *** elaborated vascular network is thought to develop via angiogenesis,a process in which new blood vessels grow from pre-existing *** capillaries exhibit organotypic features distinct from other tissues and are formed primarily by two major endothelial cell(EC)types:those that form the semi-permeable blood-brain barrier(BBB)and those that develop highly permeable pores known as fenestrae(Matsuoka et al.,2022).the structural and functional differences between BBB and fenestrated vascular ECs represent a fundament.l.feature of brain vasculature and form the foundation for both brain function and homeostasis.

关键词： angiogenesis homeostasis network

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training β relaxation to rejuvenate met.l.ic glasses

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Journal of Materials Science & technology 2023年第27期158卷 53-62页

作者： l.t.Zhang Yun-Jiang wang Y.Yang J.C.Qiao School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an 710072China State Key laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China Department of Mechanical Engineering College of EngineeringCity University of Hong KongTat Chee AvenueKowloon TongKowloonHong Kong SARChina Department of Materials Science and Engineering College of EngineeringCity University of Hong KongTat Chee AvenueKowloon TongKowloonHong Kong SARChina Innovation Center NPU-ChongqingChongqing 401135China

In the current work,we demonstrated that the rejuvenation of met.l.ic glasses can be achieved through training theβrelaxation *** the increase in the training frequency,a transition from structural relaxation to rejuvenation can be *** rejuvenation treatment is unexpected due to it occurs at a relatively small cyclic strain of 0.2%.Rejuvenation is beneficial to increase the relaxation enthalpy and promotes the decoupling of theβrelaxation process andαrelaxation process.A cluster ofβrelaxation time curves are formulated to describe any energetic state between ultrastable and ultimat.l. rejuvenated met.l.ic *** addition,rejuvenation expands the distribution ofβrelaxation process,anelastic and viscoplastic components during the deformation process.

关键词： Met.l.ic glass βrelaxation Rejuvenation Structural heterogeneity

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