Proximate principle and energy content of human milk in well-nourished urban mother

Milk samples from 54 well-nourished urban mothers between the age of 18-36 years were studied. The birth weight of infants ranged between 2.5 to 3.9 kg at full term. The mean (g or Cal/100 ml) lactose (6.51), protein (1.08), fat (4.48) and energy contents (74.83) of milk was on par with the well-nourished mothers of developed countries. The milk fat content observed was higher than that reported in under nourished mothers from developing countries.

Computer Design of a Minimum Vibration Face Milling Cutter Using an Improved Cutting Force Model

An improved cutting force model is integrated in the design of a minimum vibration face milling cutter. The cutting force of a blade is approximated by a rectangular pulse whose height is governed by the blade spacing. Specific examples of a special purpose and a general purpose cutter are given and their performances are evaluated.

Computer Design of a Vibration-Free Face-Milling Cutter

A method is developed to choose the blade spacing for a face-milling cutter that will minimize vibration. When the dynamic frequency response of a machine-tool-workpiece system is known, a special-purpose cutter can be designed to minimize the relative cutter-workpiece vibration for a particular cutting speed. When the dynamic system response is unknown the design method is limited to a general-purpose cutter to avoid resonant excitation over a broad frequency range. A nonlinear least-squares method is used to choose the blade angles for both cases. Experimental results using a general-purpose cutter with unequal blade spacing showed an appreciable reduction in noise and vibration compared to a similar cutter with equal blade spacing.