Search results for "RAIL"
showing 10 items of 699 documents
Marginal hazard ratio estimates in joint frailty models for heart failure trials
2019
Abstract This work is motivated by clinical trials in chronic heart failure disease, where treatment has effects both on morbidity (assessed as recurrent non‐fatal hospitalisations) and on mortality (assessed as cardiovascular death, CV death). Recently, a joint frailty proportional hazards model has been proposed for these kind of efficacy outcomes to account for a potential association between the risk rates for hospital admissions and CV death. However, more often clinical trial results are presented by treatment effect estimates that have been derived from marginal proportional hazards models, that is, a Cox model for mortality and an Andersen–Gill model for recurrent hospitalisations. …
A topological phase transition between small-worlds and fractal scaling in urban railway transportation networks?
2009
Abstract Fractal and small-worlds scaling laws are applied to study the growth of urban railway transportation networks using total length and total population as observational parameters. In spite of the variety of populations and urban structures, the variation of the total length of the railway network with the total population of conurbations follows similar patterns for large and middle metropolis. Diachronous analysis of data for urban transportation networks suggests that there is second-order phase transition from small-worlds behaviour to fractal scaling during their early stages of development.
A comparison of semiparametric approaches to evaluate composite endpoints in heart failure trials
2021
In heart failure trials efficacy is usually proven by a composite endpoint including cardiovascular death (CVD) and recurrent heart failure hospitalisations (HFH), evaluated with time-to-first-event analysis based on a Cox model. As a considerable fraction of events is ignored that way, recurrent event[for full text, please go to the a.m. URL]
Road restraint systems monitoring with stereoscopic dip-technique
2015
Road restraint systems (RRS) are used to protect vehicle occupants from dangerous roadside elements such as rigid obstacles, slopes, utility poles, etc. The crashes on a road restraint system damage its structure and, therefore, the functional behavioral; for this reason is required monitoring the RRS into their operational conditions. The research addresses the problem of the measurement of safety barrier (SB) deformations by means digital image processing technique (DIP). This technique is founded on the analysis of high resolution photos/videos, obtained by means of 3D camera installed into a data vehicle. The DIP technique has been used for evaluating the longitudinal safety barriers de…
Scientific papers University of Latvia; vol. 795
2014
Spodra Austruma. Mūsdienu sabiedrības vērtību transformācija skolas jauniešu vidē ; Līga Āboltiņa. 7-gadīgu bērnu sociālās adaptēšanās raksturojums ; Ilze Dinka. Bērnistabu pētījumi bērnības pedagoģijā ; Rasma Garleja, Airita Brenča. Izglītības vadības un pedagoģijas zinātnes mijattiecības ; Ligita Ģeida. Specifiskais atbalsts bērniem ar redzes traucējumiem kā nozīmīgs speciālās pedagoģijas darbības virziens ; Nora Jansone-Ratinika. Tēva pedagoģiskās kompetences portretējums Latvijā ; Vladimirs Kincāns. Analogy as an Important Pedagogical Method ; Ryk Sergiy. The Pedagogical Mythology: Origins and Projection in the Modern Ukrainian Pedagogy ; Stavitskiy Gennadiy. Psychological Analysis of M…
A framework for defining a sustainability rating system for railway track-beds
2017
Railways perform a significant role in the transportation system and they have relevant environmental, economic and social impacts. They are currently engineered optimizing every singular aspect rather than considering a broader system for improving the sustainability of the overall infrastructure. Thus, it is necessary to promote an effort to define a global sustainability framework for conceiving the design, construction and management of railway infrastructure. The Sustainable Rating System (SRS) proposed in this paper is a tool under development that evaluates different alternatives of railway track-bed structure. Inspired by similar efforts in the field of road engineering such as Gree…
Ahvenkosken sillan väritys historiankirjoituksessa
2021
Corrigendum: Effectiveness of interventions to prevent pre-frailty and frailty progression in older adults: a systematic review.
2018
ABSTRACT Objective: To summarize the best available evidence regarding the effectiveness of interventions for preventing frailty progression in older adults. Introduction: Frailty is an age-related state of decreased physiological reserves characterized by an increased risk of poor clinical outcomes. Evidence supporting the malleability of frailty, its prevention and treatment, has been presented. Inclusion criteria: The review considered studies on older adults aged 65 and over, explicitly identified as pre-frail or frail, who had been undergoing interventions focusing on the prevention of frailty progression. Participants selected on the basis of specific illness or with a terminal diagno…