Abstract: Systems, methods and instructions for creating building models of physical structures is disclosed. The building model may be a collection of floors defined by outlines containing regions that may be offset relative to a main region, and a collection of connectors. Connectors may have connection points for tracking, routing and sizing. Connectors may indicate elevation changes through georeferenced structural features. Signal elements may also be features that provide corrections when tracking. Feature descriptors are data that describes the structural configuration and signal elements enabling them to be matched to previously collected data in a database. User interface elements assist a user of a tracking device in collecting floor information, structural features and signal features and validating certain collected information based on previously known information. The height of floors may also be inferred based on sensor data from the tracking device.

Abstract: There is disclosed an extrusion processing aid composition for the extrusion of polyolefins, particularly linear low density polyethylene and high density polyethylene films of sheets; polyolefin compositions containing said processing aid and a process of extruding polyolefins using said processing aid. The processing aid is a composition comprising (a) an amide of a saturated or unsaturated carboxylic acid or a saturated or unsaturated alkylene bis-amide of a saturated or unsaturated dicarboxylic acid; (b) an aliphatic hydrocarbon polymer mixture having a molecular weight of from about 400 to about 50,000; and (c) an oxygen-containing high density, low molecular weight ethylene polymer.

Abstract: There is disclosed an extrusion processing aid composition for the extrusion of polyolefins, particularly linear low density polyethylene and high density polyethylene films or sheets; polyolefin compositions containing said processing aid and a process of extruding polyolefins using said processing aid. The processing aid is a composition comprising (a) an amide of a saturated or unsaturated carboxylic acid or a saturated or unsaturated alkylene bis-amide of a saturated or unsaturated dicarboxylic acid; (b) an aliphatic hydrocarbon polymer mixture having a molecular weight of from about 400 to about 50,000; and (c) an oxygen-containing high density, low molecular weight ethylene polymer.