Evaluation of chip breaker designs on tool life and hole integrity in drilling of HFRP/Al composite.

In this study, drilling of a newly developed lightweight fire-retardant carbon/glass-fiber-reinforced polymer epoxy sandwich that includes an aluminum honeycomb core with modified epoxy (HFRP/Al sandwich composite) is investigated. A new high-performance insert combination comprising central-stepped and peripheral-wiper inserts is evaluated. The geometry of the central insert is kept constant while two variations in chip breaker (C) designs are introduced on wiper inserts differentiated mainly based on C width and C depth.

Complex Materials with Stochastic Structural Patterns: Spiky Colloids with Enhanced Charge Storage Capacity.

Self-assembled materials with complex nanoscale and mesoscale architecture attract considerable attention in energy and sustainability technologies. Their high performance can be attributed to high surface area, quantum effects, and hierarchical organization. Delineation of these contributions is, however, difficult because complex materials display stochastic structural patterns combining both order and disorder, which is difficult to be consistently reproduced yet being important for materials' functionality.

Prevalence of obesity among the school-going children of Lahore and associated factors.

Objective: To determine the prevalence of obesity among the school- going children (6th and 7th grade) of Lahore and ascertain the associated factors.

Method: A descriptive study with sample size of 293 children conducted over a period of four months in two private sector schools of Lahore. Information was gathered by the help of a pre designed questionnaire after getting formal consent from parents.