187,539 research outputs found
On sub-surface stress caused by contact roughness in compressible elastic solids
No full textContact between elastic bodies with self-affine rough surfaces is mostly studied with a focus on determining surface fields, despite body fields are of great importance to establish, for instance, when and where elasticity breaks down. This work aims at analyzing the effect of contact roughness on the body fields of compressible frictionless solids modeled using Green's function molecular dynamics. Although area-load curves are insensitive to changes in the Hurst exponent as long as they are correctly normalized and are clearly not affected by compressibility, the Von-Mises stress is found to depend on both Hurst exponent and Poisson's ratio.(OLD) MSE-7Team Marcel Sluite
Fast algorithms for liquid crystal modelling
No full textWe review different modeling and computational methods to determine the Q-tensor representation of the director field alignment in the absence of defects. Under this condition it is possible to represent the reorientation dynamics of the director field as the motion of the Q-tensor over an invariant manifold. This new representation allows us to develop very accurate codes for the alignment that are orders of magnitude faster than an equivalent full Q-tensor code. We illustrate this principle by discussing the case of a pure liquid crystal with or without flow and the case of a liquid crystal doped with fixed metallic nano-inclusions
The role of non invasive central hemodynamics in patients with heart failure at cardiac rehabilitation
No full textBackground: Heart failure is a complex clinical syndrome in which the heart’s ability to pump blood around the body is reduced1. Central hemodynamics is an important factor to be considered for the individuals with heart failure. Disturbance of ventricular functions can worsen heart failure symptoms, impair independence, reduce quality of life and lead to increased health care utilization in patients with heart failure. Previous studies have identified exercise as a possible treatment for impaired ventricular function without other cardiac disease; however, there is limited evidence for the effect of this form of treatment in patients with heart failure.
Aim: The primary aim of this study was to examine the effect of a supervised, out patient based exercise training programme on noninvasive central hemodynamics in patients with heart failure. Secondary aims were to examine the reproducibility of the Non invasive Cardiac system and find the effect of exercise on functional capacity, echocardiographic measures and quality of life. Methods: The participants for the study was enrolled from IRCCS San Raffaelle Pisana, Rome, Italy. Patients diagnosed with heart failure in outpatients department for cardiac rehabilitation, who met eligibility criteria, were recruited. Participants were screened by a Cardiac Rehabilitation Specialist at each sessons to ensure exercise safety prior to study enrolment. Demographic data, medical history, medications, functional capacity (six minute walk test), echocardiography parameters (Tricuspid Annular Plane Systolic Excursion, Ejection Fraction), Sort Form-36 Quality of Life Questionnaire and Kansas City Cardiomyopathy Questionnaire were repeated at Baseline and after 8 weeks.
We enrolled 50 patients (42 men and 8 women, Mean age 64+9 Years) diagnosed with chronic heart failure.This was a prospective, single-center study. The intervention consisted of 1 hour of aerobic interval training about thrice a week. Program were designed and supervised by Cardiac Rehabilitation Physiotherapists. The primary outcome measure was a change in central hemodynamics measured by Non invasive cardiac system and secondary outcome measure was chages in echocardiographic parameters, six minute walk test and quality of life parameters.
Results: The study participants reported significantly greater clinical improvement in central hemodynamics of Stroke Volume (P = 0.005), Cardiac Output (P = 0.054), Stroke Index (P = 0.003), Cardiac Index (P= 0.035), Heart Rate (P= 0.011) Cardiac Power index (p = 0.004) and Granov Goor Index (P= 0.001).These participants also had significant improvements in six minute walk test (p = 0.000), Tricuspid Annular Plane Systolic Excursion (P=0.017), Ejection Fraction (P= 0.001) and Short Form-36 Quality of Life questionnaire (P= 0.001) and also significantly improvement in clinical course of disease byKansas City Cardiomyopathy Questionnaire (P= 0.001).
Conclusion: Eight weeks of supervised, outpatient based, aerobic interval training can improve the Non invasive central hemodynamics, echocardiographic parameters, functional capacity and Quality of life in patients with heart failure. According to our study results, the exercise training, part of cardiac rehabilitation is an important component of therapy in patients with Heart failure
Accessing, analysing, and extracting information from user generated contents: open issues and challenges
No full textThe concepts of the participative Web, mass collaboration, and collective intelligence grow out of a set of Web methodologies and technologies which improve interaction with users in the development, rating, and distribution of user-generated content. UGC is one of the cornerstones of Web 2.0 and is the core concept of several different kinds of applications. UGC suggests new value chains and business models; it proposes innovative social, cultural, and economic opportunities and impacts. However, several open issues concerning semantic understanding and managing of digital information available on the Web, like information overload, heterogeneity of the available content, and effectiveness of retrieval are still unsolved. The research experiences we present in this chapter, described in literature or achieved in our research laboratory, are aimed at reducing the gap between users and information understanding, by means of collaborative and cognitive filtering, sentiment analysis, information extraction, and knowledge conceptual modeling
sj-docx-1-pie-10.1177_09544089221103505 - Supplemental material for Comparative assessment over the selection of lean supply chain practices through fuzzy integrated principal component analysis, gray relational analysis, and complex proportional assessment approaches
No full textSupplemental material, sj-docx-1-pie-10.1177_09544089221103505 for Comparative assessment over the selection of lean supply chain practices through fuzzy integrated principal component analysis, gray relational analysis, and complex proportional assessment approaches by Gokilakrishnan Gopal and Vigneshkumar Murugesan in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering</p
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
sj-docx-1-pie-10.1177_09544089231156068 - Supplemental material for Investigation of fused deposition modeling parameters on mechanical properties and characterization of ABS/carbon fiber composites
No full textSupplemental material, sj-docx-1-pie-10.1177_09544089231156068 for Investigation of fused deposition modeling parameters on mechanical properties and characterization of ABS/carbon fiber composites by Krishnan Ravi Kumar, Nisha Soms and Murugesan Kumar in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering</p
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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