1,721,370 research outputs found
The Importance of Uncertainty in the Noise Pollution Measurements
No full textThe commentary aims to discuss the importance of uncertainties determination in the measurement of noise pollution focusing the attention on the variability of the measure and as a source of uncertainty and offers an overview of the actual research results trends
Noise Pollution: What the Scientific Community Can Do?
No full textral environmental dif culties such as waste management, greenhouse gas emissions, wastewater and environmental noise pollution.
A study made by the World Health Organization (WHO) underlines that noise pollution is second among a series of environmental “stressors” for their public health effects, having it auditory and non-auditory high health impacts.
The question is: what the scientic community can do to control of noise exposure
Synovial Biobearings: where tribology meets biology
No full textSince its birth the tribology has primarily been focused on solving the industrial problems with wear and friction through the application of better materials, novel surface technologies, improved lubricants and lubrication methods. In recent years the research focus has shifted to the newly emerging areas like nanotechnology and biotribology. Biotribology is generally involved with all aspects of tribology related to the context of biological systems. Some typical examples of tribology applied to biology include: wear of screws and plates in bone fracture repair; wear of denture; wear of replacement heart valves; tribology of contact lenses and ocular tribology; tribology of natural synovial joints and artificial replacements. The general approach adopted for biotribological studies involves: obtain input conditions from anatomical and physiological conditions from anatomical and physiological considerations; obtain input conditions from anatomical and physiological considerations.The main focus of present paper is to give a scientific overview of human synovial joints as biological systems underlining recent understanding related to their mechanical and tribological behavior in terms of friction, lubrication, and wear
A MODEL TO ANALYSE THE VISCOUS FRICTION FORCE AT THE TOP RING-CYLINDER INTERFACE IN ICEs.
No full textAPPROXIMATE CLOSED-FORM SOLUTION FOR THE DYNAMICAL ANALYSIS OF SHORT BEARINGS WITH COUPLE STRESS FLUID
No full textThe film forces in journal bearings may cause self-exciting oscillations under particular operating conditions; if the amplitude of these oil-whirl oscillations becomes too large, it may involve unsafe machinery dynamics. Thus, there is a need to understand the dynamic characteristics of the journal bearings evaluating the performances of the couple stress lubricants used to minimise the friction losses in steady operating conditions.
The purpose of this paper was to illustrate a method to formulate with closed-form solutions the non-steady fluid film forces, and the stiffness and damping coefficients for ‘short’ liquid-lubricated couple stress journal bearings, assuming the micro-continuum Stokes’ model.
It is shown that the model allows the advantage of minimising the computational time required for the nonlinear dynamic analysis of couple stress journal bearings without any significant loss of accuracy, while the analytical form of the solution involves a better readability of the parameter effects on the system unsteady behaviour
SQUEEZE-FILM LUBRICATION OF THE HUMAN ANKLE JOINT: A SIMPLIFIED ANALYTICAL MODEL DURING WALKING
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