Abstract: Silica coated glass bubbles comprising a glass bubble and a silica coating in direct contact with the outer surface of the bubble, wherein the silica coating is substantially free of silanol groups. A composite comprising a polymer and a plurality of the silica coated glass bubbles dispersed therein. Articles comprising the composite. Methods for making the silica coated glass bubbles.

Abstract: An engine driven welding system having an air compressor subsystem is provided. The system includes a first air pressure sensor to measure an outlet air pressure value at an outlet of the air compressor subsystem. A proportional air inlet valve device is configured to be adjusted to regulate the outlet air pressure value. A controller is configured to record an adjustment value of the proportional air inlet valve device as adjusted. A clutch mechanism is configured to be engaged to enable air compression, and to be disengaged by the controller when the adjustment value of the proportional air inlet valve falls below a first threshold value for a determined period of time. A second air pressure sensor is configured to monitor a second air pressure value, where the clutch mechanism cannot be re-engaged by the controller unless the second air pressure value falls below a second threshold value.

Abstract: A computer-implemented method for transmitting information comprises receiving, by a server, contact information about a participant; assigning, by the server, an identification to the participant; associating, by the server, the identification with the contact information of the participant; allowing, by the server, use of the identification on a network, wherein the network is limited to a geographic region; receiving, by the server, a request transmitted over the network to send a message to the participant, wherein the request comprises the identification of the participant; determining, by the server, a method of communication of the participant based upon the identification in the request; and transmitting, by the server, the message to the participant using the preferred communication method.

Abstract: A computer-implemented method for transmitting information comprises receiving, by a server, contact information about a participant; assigning, by the server, an identification to the participant; associating, by the server, the identification with the contact information of the participant; allowing, by the server, use of the identification on a network, wherein the network is limited to a geographic region; receiving, by the server, a request transmitted over the network to send a message to the participant, wherein the request comprises the identification of the participant; determining, by the server, a method of communication of the participant based upon the identification in the request; and transmitting, by the server, the message to the participant using the preferred communication method.