Search results for "BICYCLE"
showing 10 items of 49 documents
GENETIC AND ENVIRONMENTAL VARIATION IN PERCEIVED EXERTION AND HEART RATE DURING BICYCLE ERGOMETER WORK
1977
The relative contributions of heredity and environment to the variance in heart rate (HR) and rating of perceived exertion (RPE) during the bicycle ergometer work were studied with 14 pairs of male (6 monozygous (MZ) and 8 dizygous (DZ)) and 22 pairs of female (8 MZ and 14 DZ) twins ranging in age from 11 to 20 years. The results showed for both sexes that no significant differences in the intrapair variances of HR and RPE could be observed between the MZ and DZ twin samples. Thus it was concluded that in contrast to several other parameters of the measurements of the physical work capacity HR and RPE are not influenced to any significant degree by the genetic factors.
Gender differences in bicycle sharing system usage in the city of Valencia
2021
Abstract Bicycle sharing systems (BSS) in cities are an environmentally friendly alternative to fossil-fuel-based transport. Among the different factors that influence its use, the scientific literature points out that there are gender differences in the frequency of trips made. The present study analysed the movements of men and women who use the BSS in the city of Valencia during weekdays. Our database contained a total of 5,300,328 trips by users over a period of 4 years. Ridership networks were constructed through user's trips (arcs) between the bicycle exchange stations (nodes). Different parameters of centrality and density of the generated networks were calculated, and the Voronoi sp…
Stochastic analysis of motorcycle dynamics
2011
Off-road and racing motorcycles require a particular setup of the suspensions to improve the comfort and the safety of the rider, maintaining a continuous contact between the road and the motorcycle (by means of the tires). Further, because of the ground roughness, in the case of offroad motorcycle, suspensions usually experience extreme and erratic excursions (suspension stroke) in performing their function. In this regard, the adoption of nonlinear devices can, perhaps, limit both the acceleration experienced by the sprung mass and the excursions of the suspensions. This leads to the consideration of asymmetric nonlinearly-behaving suspensions. This option, however, induces the difficulty…
Transportation and sustainable development in a mid-size French city, Dijon
2011
International audience
On Holditch's theorem and related kinematics
2019
El teorema de Holditch es un resultado clásico sobre áreas de curvas planas generadas por el movimiento de segmentos. Esta construcción está estrechamente relacionada con otros tipos de curvas como, por ejemplo, curvas paralelas, curvas de anchura constante o curvas de bicicletas. Se compilan las propiedades básicas de este tipo de curvas y se da una revisión histórica sobre el teorema de Holditch y teoremas relacionados de cinemática. Primero, la situación plana de Holditch se define rigurosamente y se consideran ciertos problemas como la existencia de dicha construcción o el modo de evitar movimientos retrógrados en el segmento que se va moviendo. En el enunciado del teorema de Holditch a…
Magnetic field effects on human body of wireless chargers for E-bikes
2017
For the electric vehicles battery charging, the wireless power transmission is increasingly representing an innovative solution. The inductive power transfer is the standard technology of wireless charging: the energy transfer occurs between two magnetically coupled coils. Although this battery charging system is especially convenient for E-bikes, the physiological effects of the related magnetic fields shall be estimated and taken into account. In this paper, a 200 W prototype of wireless battery charger for E-bikes is proposed and described. Moreover, various measurements of the surrounding magnetic field are carried out to evaluate the actual physiological compatibility of the system.
The return of bicycles as a sustainable transportation tool in France
2010
International audience
Solving congestion in cities : policies and contradictions
2009
International audience; Most cities in the world are now facing traffic gridlock. Local governements and transportation authorities are trying to tame a phenomenon which takes in fact very different forms depending on the level of social and economic development. Is it really possible to compare freeway gridlock in Los Angeles with rickshaw gridlock in Dhaka, Bangladesh ? When French cities embrace the development of urban bicycling, Chinese cities limit the use of bicycles. Using cases of cities in different parts of world, this presentation willl try to find some common trends in urban mobility policies and examine some contradictory developments.
Humour and the bicycle, 1890-1940: From literary imagination to social history
2014
International audience
Public employees in South-Western Norway using an e-bike or a regular bike for commuting – A cross-sectional comparison on sociodemographic factors, …
2019
Large-scale analyses on the travel behavior of e-bikes are scarce, and current knowledge regarding who the e-bike owners are is inconsistent. Also, commuters represent a relevant user group with an unexploited potential. Therefore, the purpose of the present study was to examine (i) associations between type of bike (e-bike vs. regular bike) with place of residence (county), sociodemographic variables (age, sex, educational level, income and ethnicity) and habitual physical activity level, and (ii) if public employees possessing an e-bike cycle more often and longer distances to work. A cross-sectional survey was conducted in 2017 among 1977 (5.2% of eligible subjects) public employees in S…