880 research outputs found
Ultrasonography: a reliable technique in detecting ganglion cysts in the supraspinatus fossa.
No full textDirect numerical simulation of turbulent Couette-Poiseuille flow with zero skin friction
No full textThe near-wall scaling of mean velocity U(y) is addressed for the case of zero skin friction on one wall of a fully turbulent channel flow. The present DNS results can be added to the evidence in support of the conjecture that U is proportional to √yw in the region just above the wall at which the mean shear dU/dy = 0
Lives and Afterlives: Luo Ping's 'Guiqu tu'
No full textThe article focuses on Luo Ping's Guiqu tu or Ghost Amusement scroll painting. It states that Guiqu tu is a strange painting that serves as a record of what Luo Ping had actually seen. It cites several paintings including 'gazing at a lotus pond,' 'Drunken Zhong Kui' and 'Sleeping Zhong Kui.' It also mentions that Ju Lian's demon queller emerged as part of a wider narrative of responses to war while Guiqu tu painting was recognized as an artistic monument in the 19th century
Floating breakwaters; a theoretical study and preliminary design of a dynamic wave attenuating system
No full textHumans have been using ships to transport goods and people around the globe for hundreds and thousands of years. In all cases harbours have been critical for the exchange of goods and have played a significant role in the development of countries. Initially, harbours were located in sheltered natural bays; later breakwaters were used to provide shelter. An interesting next step would be the development of floating harbours at strategic locations. This would eliminate the need for capital dredging and can reduce the number of required harbour calls. A floating breakwater is an essential element in the design of a floating harbour to provide safe shelter for large scale floating structures. The missing link in designing an effective floating breakwater is a design-tool to make quick preliminary designs which can be developed further. A 2-dimensional linear spring model, the ReFBreak2D-model, has been developed to assess the performance of various floating breakwater designs. The hydrodynamic behaviour, as calculated by the model, has been validated with DELFRAC, a three dimensional potential model to determine reliability of the calculations. The results of the ReFBreak2D-model correspond well to the output of the DELFRAC simulation. The most important outcomes from the ReFBReak2D-model are: - The performance of the floating breakwater is primarily determined by the beam/draught ratio (Yw/T1-ratio) and the location of the centre of gravity (COG). - A rectangular floating breakwater with an Yw/T1-ratio of 5.0 and a high COG is the most optimal design. - A system of two floating breakwaters fulfils the requirements. These outcomes have been used to develop a preliminary design of the largest element. The length of the element is 500 metres, the beam is 100 metres and draught is 20 metres. This leads to a displacement of 1,000,000 tonnes, of which 270,000 tonnes are ballast. The element is moored using a turret mooring system; this makes it possible to weathervane during storm conditions.Hydraulic EngineeringCivil Engineering and Geoscience
Finite-Sample Bias Propagation in Autoregressive Estimation With the Yule–Walker Method
No full textThe Yule-Walker (YW) method for autoregressive (AR) estimation uses lagged-product (LP) autocorrelation estimates to compute an AR parametric spectral model. The LP estimates only have a small triangular bias in the estimated autocorrelation function and are asymptotically unbiased. However, using them in finite samples with the YW method for AR estimation can give a strong distortion in the weak parts of the power spectral density. The distortion is shown to be influential in an example without strong spectral peaks. The true biased AR model, which is computed by applying the triangular bias to the true autocorrelation function, has an infinite order. A new objective measure is introduced to determine the smallest sample size for which the unbiased asymptotic theory can be considered as a fair approximation.Multi-Scale PhysicsApplied Science
Combination Of Cfd And Csd Packages For Fluid-Structure Interaction
No full textIn this article the UDF script file in the Fluent software was rewritten as the "connecting file" for the Fluent and the ANSYS/ABAQUS in order that the joined file can be used to do aero-elastic computations. In this way the fluid field is computed by solving the Navier-Stokes equations and the structure movement is integrated by the dynamics directly. An analysis of the computed results shows that this coupled method designed for simulating aero-elastic systems is workable and can be used for the other fluid-structure interaction problems
Impact of strabismus on the quality of life of Chinese Han teenagers
No full textChangsen Tu, Liang Ye, Longfei Jiang, Yuwen Wang, Yingzi Li The Eye Hospital of Wenzhou Medical University, School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, People’s Republic of China Background: Although much research has been conducted on the impact of strabismus on the quality of life (QoL) of adults, the effect of this condition on teenagers has not been extensively studied. This study therefore aimed to assess the effect of strabismus on the vision-related QoL of Chinese teenagers.Methods: The Chinese version of the 25-item National Eye Institute Visual Function Questionnaire (NEI-VFQ-25) was self-administered by 1,040 teenagers with strabismus and 1,002 individuals with normal vision. All the participants were from the Chinese Han population. The independent samples t-test was used to compare QoL between teenagers with and without strabismus.Results: The majority of scores on the NEI-VFQ-25 domains were significantly different between the two groups. QoL was significantly lower in individuals with strabismus compared with teenagers with normal vision on all domains, with the exception of social functioning.Conclusion: Statistically significantly lower vision-related QoL scores were found in Chinese Han teenagers with strabismus compared with those without strabismus. Keywords: quality of life, strabismus, NEI-VFQ-25, teenager, HRQo
XML approach to communication design of WebGIS
No full textXML can describe the concept model of inclusion relationship conveniently. Also, it can directly express the concept model in an understandable way, and the expression format is so flexible that no useless element will be included there. While describing communication protocols by XML, we can not only give a common format for data and control commands, but also reuse the existing XML-parsers, so as to facilitate the expansibility and integration of protocols in a system, W3C had proposed Simple Object Access Protocol (SOAP) [1], which is a light weight protocol based on XML used to build information exchange framework under distributed environments. ArcInfo's ArcIMS also used ArcXML as the fundamental command and data transmission protocols to communicate between users' web pages and backend spatial data servers [2]. Our idea of XML based communication protocols for WebGIS benefits from the SOAP model, but we basically focus on the application in WebGIS. With the aid of UML, the typical requiring and responding protocols of WebGIS are analyzed firstly. Then the mechanism of designing communication protocols following W3C's XML Schema specification is illustrated.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000231171300077&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Computer Science, Information SystemsComputer Science, Theory & MethodsSCI(E)CPCI-S(ISTP)
State-Space Inference and Learning with Gaussian Processes
Full text link18.10.13 KB. Ok to add author version to spiral, authors hold copyright.State-space inference and learning with Gaussian processes (GPs) is an unsolved problem. We propose a new, general methodology for inference and learning in nonlinear state-space models that are described probabilistically by non-parametric GP models. We apply the expectation maximization algorithm to iterate between inference in the latent state-space and learning the parameters of the underlying GP dynamics model. Copyright 2010 by the authors
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