Abstract: Systems and methods for automatic sampling, digestion, and joining a plurality of sample introduction systems of a sample for subsequent analysis by ICP-MS are described.

Abstract: An adjustable protective helmet having a substantially rigid outer bowl-shaped shell sized larger that the user's head, and having inner padding inside of the shell sized to fit on the user's head but with a looser fit than desired. The adjustment structure includes a flexible strap extended through circumferentially spaced slots in the shell to extend both inside of and outside of the shell, to its ends outside of the shell sized to overlap one another. A rivet secures the underlying strap end to the shell. The padding between the shell slots is free from connection with the shell, and the strap in this region overlies the padding between the padding and shell and is secured to the padding. Quick release fastening pads on the overlapping strap ends allow them to be releasibly secured together. The strap can thus be tightened via the overlying strap end from outside of the shell and connected to the underlying strap end to establish the helmet fit desired.

Abstract: A combination helmet and body protection device for use in sports such as American football and other hazardous activities such as driving, cycling, hockey, riot control, and fire fighting to protect the human body from potentially crippling forces applied to the head and upper body, comprising an upper torso section having internal padding attached thereto, an outer helmet which can be securely connected to the upper torso section so that the outer helmet cannot rotate with respect thereto and which can be easily removed from the upper torso section, and an inner helmet section which fits securely on the wearer's head and which allows rotation of the wearer's head inside the outer helmet section.