Modeling cycling performance: Effects of saddle position and cadence on cycle pedaling efficiency

2021 ◽  
Vol 104 (4) ◽  
pp. 003685042110414
Author(s):  
JongRok Lee ◽  
Kiwon Park
Keyword(s):  
Energy Conservation ◽  
Experimental Method ◽  
Mechanical Energy ◽  
Effective Means ◽  
Experimental Studies ◽  
Cycling Performance ◽  
Horizontal Distance ◽  
Knee Angle ◽  
Performance Effects ◽  
Optimal Cadence

The modeling method is an effective means of estimating causality as well as examining cycle pedaling efficiency. Pedaling efficiency can also be examined by an experimental method, but the experimental method can lead to contradictory results due to perturbation of the measured output parameters. Experimental studies generally yield realistic results, but it is difficult to control for all the variables of interest and to determine the causal relationships between them. The objective of this study is to investigate the pedaling efficiency and causality with considering saddle position and pedaling cadence as variables. Based on the mathematical pedaling modeling, the internal work calculation method was used to calculate the consumed mechanical energy and energy conservation percentage ([Formula: see text]). The optimal saddle position with the lowest mechanical energy and the highest energy conservation percentage could be changed by the cadence. At the low cadence, the higher saddle position, and the shorter horizontal distance between the saddle and crankshaft led to higher pedaling efficiency ( h: 0.95 m, d: 0.16 m, and knee angle: [Formula: see text]). However, the highest pedaling efficiency was achieved at the high cadence with a saddle height ( h) of 0.9 m and a horizontal distance between the saddle and the crankshaft ( d) of 0.06 m (knee angle: [Formula: see text]). The lowest cadence is the optimal cadence in terms of the consumed energy, but the optimal cadence was 90 r/min in terms of the energy conservation percentage. Compared to the energy consumption, the energy conservation percentage was demonstrated to influence the fatigue of a cycle rider more critically. The energy conservation percentage was highest at 90 r/min, and 90 r/min was close to the preferred cadence by the cyclist.

Field Experiments in Corporate Sustainability Research

2016 ◽  
Vol 29 (4) ◽  
pp. 391-400 ◽  
Author(s):  
Magali A. Delmas ◽  
J. Alberto Aragon-Correa
Keyword(s):  
Energy Conservation ◽  
Experimental Method ◽  
Field Experiments ◽  
Corporate Sustainability ◽  
Experimental Studies ◽  
Successful Implementation ◽  
Conservation Behavior ◽  
Effective Strategies ◽  
Sustainability Research ◽  
Sustainable Behavior

Experimental studies are a valuable tool to test effective strategies for encouraging sustainable behavior but have not been used much in corporate sustainability research. In this article, we describe the benefits and challenges of the randomized field experimental method for research in corporate sustainability. We draw on the examples of our own research in energy conservation behavior to illustrate some of the hurdles that need to be overcome for the successful implementation of field experiments.

Effects of monetary and nonmonetary interventions on energy conservation: A meta-analysis of experimental studies

2021 ◽  
Vol 149 ◽  
pp. 111342
Author(s):  
Lingyun Mi ◽  
Xiaoli Gan ◽  
Yuhuan Sun ◽  
Tao Lv ◽  
Lijie Qiao ◽  
...  
Keyword(s):  
Energy Conservation ◽  
Meta Analysis ◽  
Experimental Studies

New approaches to pharmacotherapy of allergic eye diseases

2015 ◽  
pp. 18-26
Author(s):  
Zoya Veselovska ◽  
Nataliia Veselovska
Keyword(s):  
Effective Means ◽  
Experimental Studies ◽  
Tear Film ◽  
Eye Diseases ◽  
Eye Drops ◽  
Lipid Layer ◽  
Ophthalmic Surgery ◽  
Promising Alternative ◽  
New Approaches ◽  
New Generation

The problem of studying the prеvalencе of allergic diseases of the eye and the search for new approaches and effective means to correct this condition does not lose its relevance. The presented data on the state of profound biochemical studies of the tear film in allergic conditions justify the expediency of the use of eye drops of a new generation. As a result of experimental studies on the effect on the lipid layer ectoine was discovered the mechanism of its therapeutic action. This paper presents compelling evidence that new eye drops based on natural molecules ectoine which are able to restore and maintain the functional state of the lipid layer of the tear film in the pharmacotherapy of аllergic diseases of anterior surface of the eye. The analyzes of multiple experimental data revealed the clear evidence of mechanisms of action on the eye and the first clinical experience with a new pharmacological agent testifies to its strong anti-inflammatory and regenerative effect due to the stabilization of the lipid layer of the tear film and the protection of the front surface of the eye tissue from the hyperosmolarity. It was confirmed by the subjective and objective reducing eye irritation and dryness in reducing itching and burning from the conjunctiva, to improve the moisture level of the surface of the eye, to reduce discomfort of the eyes. The drug can be used in children older than 2 years and adults, when wearing contact lenses, ophthalmic surgery and after an eye injury. Based on this, it can be conclude that the appearance in the arsenal of new-generation antiallergic eye drops (EYE-t) with sufficient efficacy and safety profile can be regarded as a promising alternative approach to the treatment of allergic and inflammatory eye diseases.

scholarly journals Analysis of dynamics of a vertical cantilever in rotary coupling to the moving frame with movement limiters

2018 ◽  
Vol 241 ◽  
pp. 01021
Author(s):  
Piotr Wolszczak ◽  
Grzegorz Litak ◽  
Krystian Lygas
Keyword(s):  
Mechanical Energy ◽  
Elastic Beam ◽  
Beam Deflection ◽  
Moving Frame ◽  
Nonlinear Phenomena ◽  
Horizontal Distance ◽  
Energy Effect ◽  
Cross Sectional ◽  
Excitation Beam ◽  
Analysis Of Dynamics

The efficiency of the mechanical energy harvesting with the use of vibrating elements can be improved by synchronizing stimulation vibrations and own linear frequencies of systems as well as super or sub harmonics induced by non-linear phenomena. The article presents numerical cross-sectional study of the mechanical system. The system consists of an elastic beam set vertically, which the lower end is fixed in the rotary support, and is stimulated to move in the horizontal axis. The upper end of the beam is free but below its level there are bumpers limiting the free rotation of the beam. Numerical studies took into account the variability of the frequency and amplitude of the excitation beam movement, and horizontal distance between bumpers. Beam deflection was observed, on the basis of which the amount of energy generated by the piezo element was estimated. Nonlinear phenomena and analysis of frequency synchronization of vibrations improving the energy effect of an energy generator are presented.

scholarly journals Determination of the time of ignition of plant raw under the high temperature of the radiation panel

2020 ◽  
Vol 11 (3) ◽  
Author(s):  
V. V. Lomaha ◽  
O. Yu. Tsapko ◽  
Yu. V. Tsapko ◽  
O. P. Bondarenko
Keyword(s):  
High Temperature ◽  
Fire Protection ◽  
Effective Means ◽  
Experimental Studies ◽  
Fire Retardant ◽  
Protective Layer ◽  
Thermal Action ◽  
Environmental Safety ◽  
Wood Products ◽  
Operational Parameters

Reducing the fire prevention of timber is not only an economic task, but also has a social and environmental focus. From economic, technological and environmental perspective, an important problem in ensuring the viability and safe operation of construction sites is the development of fire-retardant coatings for wooden structures. The construction is increasingly looking for new highly effective means of fire protection of wood and wood products which should not only ensure the standardized fire resistance of wood, but also to maintain its operational parameters to solve environmental safety and durability. Studies of the effect of the radiation panel on the ignition of the wood sample have set the parameters of the flame ignition, which makes it possible to influence this process. It is proved that they consist in the formation of a layer of organic material on the surface, which provides heating to a critical temperature, when the intensive decomposition of the material begins with the release of the required amount of combustible gases and their ignition. This makes it possible to determine the effect of fire protection and the properties of protective compositions on the process of slowing down the rate of burning of wood. Experimental studies have confirmed that the untreated sample of wood, under the thermal action of the radiation panel has taken up, the flames spread over the entire surface, which led to its combustion. The application of a fire retardant varnish under the influence of temperature leads to a layer of foam coke and inhibition of heat transfer of high-temperature flame to the material and its ignition. Thanks to this, it became possible to determine the conditions for changing the parameters of combustion and braking during fire protection of wood, by forming a barrier for thermal conductivity. Thus, there is reason to argue for the possibility of directional control of the processes of fire protection of wood by the use of fireproof coatings that can form a protective layer on the surface of the material, which slows down the rate of burning of wood.

scholarly journals Heat transfer in the mold during vertical continuous casting of steel

2018 ◽  
pp. 26-30
Author(s):  
E. I. Marukovich ◽  
E. B. Demchenko
Keyword(s):  
Heat Transfer ◽  
Temperature Regime ◽  
Thermal State ◽  
Effective Means ◽  
Experimental Studies ◽  
Casting Process ◽  
Continuous Casting Of Steel ◽  
Technological Parameters ◽  
Casting Method ◽  
Calculation Technique

The analysis of the performed researches has shown that the offered calculation technique is an effective means of management of formation process in casting. The found dependences and experimental data allow to calculate the specific value of the exactм heat flux in a given range of technological parameters obtained during a series of successful experiments for a particular casting method.Having the results of studies of the temperature regime of the mold during casting of a certain size and profile, it is possible to calculate the thermal state of the mold for the same casting process, but for the production of castings of any other size and profile.Having a certain amount of information on the temperature regime of the mold at different casting methods, you can use the solutions obtained to become the owner of a database containing the necessary information for solving the problems of solidification of the casting. In the subsequent design of equipment and equipment there is no need for additional experimental studies and analysis of the results.

A Better 2-D Mechanical Energy Conservation Experiment

2012 ◽  
Vol 50 (2) ◽  
pp. 109-111
Author(s):  
Michael Paesler
Keyword(s):  
Energy Conservation ◽  
Mechanical Energy

Digital Filtering of Deep Crustal Seismic Reflections

1972 ◽  
Vol 9 (4) ◽  
pp. 434-451 ◽  
Author(s):  
R. M. Clowes ◽  
E. R. Kanasewich
Keyword(s):  
Lower Crust ◽  
Effective Means ◽  
Phase Correlation ◽  
Layered System ◽  
Horizontal Distance ◽  
Southern Alberta ◽  
Velocity Filtering ◽  
Seismic Reflections ◽  
Zero Phase

Seismic reflections at near-vertical incidence from within the lower crust were recorded along a 90 km continuous profile in southern Alberta. The digitized seismograms were filtered as a means of improving signal-to-noise ratios. Zero-phase bandpass filtering improves the quality of the records but also introduces a disadvantage; the narrow pass bands cause the filtered seismograms to become more oscillatory and exclusion of the higher frequencies destroys some of the record character which is useful in phase correlation. Velocity filtering is shown to be a more effective means of delineating individual reflection events, particularly if their apparent velocities vary widely. A record section compiled from such filtered data indicates a considerable number of reflecting horizons at various depths in the lower crust. When the reflections are migrated and a "wiggle" structure section compiled, the complexity of the lower crust in southern Alberta is revealed. Vertical relief reaches as much as 9 km over a horizontal distance of 40 km and lateral changes in the layered system can be noted.

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