American Society for Testing and Materials

https://repositorium.sdum.uminho.pt/bitstream/1822/3992/1/0074.pdf

Bioinert, biodegradable and injectable polymeric matrix composites for hard tissue replacement: state of the art and recent developments

Voids, the most studied type of manufacturing defects, form very often in processing of fiber-reinforced composites. Due to their considerable influence on physical and thermomechanical properties ...

https://journals.sagepub.com/doi/pdf/10.1177/0021998318772152

Voids in fiber-reinforced polymer composites: A review on their formation, characteristics, and effects on mechanical performance:

This review aims to provide an introduction to the aspects of composites and adhesive joints relevant to nondestructive testing. The first part of this review consists of a brief introduction to composites and adhesive joints, together with a description of the types of defects that may occur. The second part describes briefly the main relevant nondestructive techniques used to identify these defects and indicates the senstivity of each method to the different types of defect.

A review of defect types and nondestructive testing techniques for composites and bonded joints

UNLABELLED\nOBJECTIVE--To examine the relationship between plasma cholesterol concentration and mortality from major causes of death.\n\n\nDESIGN\n--Cohort study. SETTING--Civil service offices in London, England. PARTICIPANTS--There were 17,718 male civil servants aged 40 through 64 years at the time of study entry between 1967 and 1969. MAIN OUTCOME MEASURE--Mortality from major cause groups. RESULTS--There were 4022 deaths in the cohort over the 18 years of follow-up. Total mortality increased with cholesterol level, although mortality in the small group with very low cholesterol levels (5% of study population) was nonsignificantly higher (P greater than .5) than that of the remainder of the lowest quintile cholesterol group. Coronary heart disease mortality increased with increasing cholesterol concentration from the lowest levels (P less than .001 for trend). The cancer mortality rate in the group below the fifth centile of the cholesterol distribution was higher than in the remainder of the cohort for lung (P less than .001), pancreas (P = .05), liver (P = .09), and all smoking-related cancers (P = .02). Only for lung cancer was there a consistent inverse trend with cholesterol level (P less than .01). Rates of mortality due to non-neoplastic respiratory disease were inversely related to cholesterol level (P less than .001). Health state at the time of examination and socioeconomic position were related to cholesterol concentration--subjects in lower employment grades, with disease at baseline, with a history of recent unexplained weight loss, or who had been widowed had lower initial cholesterol levels. These associations largely accounted for the relationships between cholesterol level and noncardiovascular mortality. CONCLUSIONS--The inverse associations between plasma cholesterol concentration and mortality from certain causes of death seen in cohort studies could be because the participants with low cholesterol levels possess other characteristics that place them at an elevated risk of death.

Plasma cholesterol concentration and mortality : the whitehall study

Non-linear dynamic behaviors of rolling element bearings due to surface waviness

The effect of speed of balanced rotor on nonlinear vibrations associated with ball bearings

Meshless element free Galerkin method for unsteady nonlinear heat transfer problems

This article deals with the transient and steady-state solution of two-dimensional heat transfer through the fins using a meshless element free Galerkin method. Moving least-square approximants are used to approximate the unknown function of temperature T h (x) with Th (x) . These approximants are constructed by using a linear basis, a weight function, and a set of nonconstant coefficients. The variational method has been used for the development of discrete equations. Essential boundary conditions are enforced by using Lagrange multipliers. A hyperbolic weight function has been proposed. The results are obtained for a two-dimensional model and compared with the results of the finite-element method.

Ravi Prakash

Papers

Non-linear dynamic behaviors of rolling element bearings due to surface waviness

The effect of speed of balanced rotor on nonlinear vibrations associated with ball bearings

Meshless element free Galerkin method for unsteady nonlinear heat transfer problems

Heat transfer analysis of two-dimensional fins using meshless element free galerkin method

Fracture behaviour of fly-ash filled FRP composites