Abstract: A site light including a body, an arm coupled to the body having an adjustable arm length, a light assembly coupled to the arm opposite the body, and a drive assembly configured to alter the arm length. The drive assembly, in turn, includes a drive wheel mounted for rotation with respect to the body, an idle wheel mounted for rotation with respect to the body, and a biasing member configured to bias the idle wheel toward the drive wheel. The site light also includes a cable coupled to the arm where the cable is positioned between and engaged by both the drive wheel and the idle wheel.

Abstract: A site light including a body, a power system with an AC input and battery terminal, and a telescopic arm assembly supported by the body, where the telescopic arm includes a first end fixed relative to the body and a second end opposite and movable with respect to the first end. The site light also includes a light assembly in operable communication with the power system and coupled to and movable together with the second end of the telescopic arm, where the light assembly is operable in a first light mode in which the light assembly outputs approximately 13,000 lumens of light, and a second light mode in which the light assembly outputs approximately 20,000 lumens of light.

Abstract: The method of the invention provides a simple, reproducible reference, or set of reference standards, as a validation of a calibration standard for filter-based measurements of light absorbing aerosol particles (black carbon and brown carbon) and organic carbon and elemental carbon particles found in indoor and outdoor environments, and in emission streams. The set of reference standards comprise grayscale images deposited by a mist or print at a known density on a substrate material. The reference standards may be made by a printer using as a substrate either paper or another material such as glass fiber, quartz fiber, polypropylene, or cellulose.

Abstract: A system and method are described for determining properties of particulates. The device collects particulates on the surface of an oscillating balance and compares the natural resonant frequency of the balance with the particulates with a balance without particulates. In addition, the collected particulates are illuminated with light that is absorbed by the particulates. This causes the balance to heat up, affecting the natural resonant frequency. A comparison of the natural resonant frequencies reveals optical properties of the collected particulates, which may be used to speciate the particulates.

Abstract: The method of the invention provides a simple, reproducible reference, or set of reference standards, as a validation of a calibration standard for filter-based measurements of light absorbing aerosol particles (black carbon and brown carbon) and organic carbon and elemental carbon particles found in indoor and outdoor environments, and in emission streams. The set of reference standards comprise grayscale images deposited by a mist or print at a known density on a substrate material. The reference standards may be made by a printer using as a substrate either paper or another material such as glass fiber, quartz fiber, polypropylene, or cellulose.

Abstract: A system and method are described for determining properties of particulates. The device collects particulates on the surface of an oscillating balance and compares the natural resonant frequency of the balance with the particulates with a balance without particulates. In addition, the collected particulates are illuminated with light that is absorbed by the particulates. This causes the balance to heat up, affecting the natural resonant frequency. A comparison of the natural resonant frequencies reveals optical properties of the collected particulates, which may be used to speciate the particulates.

Abstract: An apparatus and method are presented for the analysis of materials. The apparatus includes two or more similar analyzers, with the output of the analyzers combined to provide improved measurements. The apparatus may be, for example, a differential photometric analyzer, such as the AETHALOMETER®. The apparatus includes a processor programmed to accept an instrument constant determined at low filter loadings and use the constant to compensate for non-linear instrument responses. A method is also presented for conditioning filters before use.

Abstract: A method is provided for diagnosing the operation of a photometric particle analyzer. The method may determine when the operation is degraded from normal operating conditions, automatically, and the result displayed locally as well as being transmitted to a remote observer. The present invention may be used by optical photometric particle analyzers, or by analyzers that measure other properties of particles collected on filters.

Abstract: An apparatus and method are presented for the analysis of materials. The apparatus includes two or more similar analyzers, with the output of the analyzers combined to provide improved measurements. The apparatus may be, for example, a differential photometric analyzer, such as the AETHALOMETER®. The apparatus includes a processor programmed to accept an instrument constant determined at low filter loadings and use the constant to compensate for non-linear instrument responses. A method is also presented for conditioning filters before use.

Abstract: An apparatus and method are presented for the analysis of materials. The apparatus includes two or more similar analyzers, with the output of the analyzers combined to provide improved measurements. The apparatus may be, for example, a differential photometric analyzer, such as the AETHALOMETER®. The apparatus includes a processor programmed to accept an instrument constant determined at low filter loadings and use the constant to compensate for non-linear instrument responses. A method is also presented for conditioning filters before use.

Abstract: A method is provided for diagnosing the operation of a photometric particle analyzer. The method may determine when the operation is degraded from normal operating conditions, automatically, and the result displayed locally as well as being transmitted to a remote observer. The present invention may be used by optical photometric particle analyzers, or by analyzers that measure other properties of particles collected on filters.

Abstract: A method is provided for diagnosing the operation of a photometric particle analyzer. The method may determine when the operation is degraded from normal operating conditions, automatically, and the result displayed locally as well as being transmitted to a remote observer. The present invention may be used by optical photometric particle analyzers, or by analyzers that measure other properties of particles collected on filters.

Abstract: A method is provided for diagnosing the operation of a photometric particle analyzer. The method may determine when the operation is degraded from normal operating conditions, automatically, and the result displayed locally as well as being transmitted to a remote observer. The present invention may be used by optical photometric particle analyzers, or by analyzers that measure other properties of particles collected on filters.

Abstract: An apparatus and method are described for extracting useful work from pressure transients in a pneumatic tire to replace lost air from the tire. The apparatus and method operate continuously and without human intervention. When also used with a pressure relief valve, the apparatus and method permit the tires that are being driven to be maintained at a desired average pressure.

Abstract: Apparatus and methods are described for determining particulate concentrations in an exhaust gas. One embodiment provides a method of analyzing particles in a gas using an apparatus including a probe and an analyzer. The method includes obtaining a sample of particle laden gas through the probe; obtaining ambient air through the probe; diluting the sample with the ambient air; and providing the diluted sample to the analyzer. Another embodiment provides an apparatus for analyzing particles in a gas. The apparatus includes a probe adapted to accept a gas or ambient air; a volume to dilute the gas with the ambient air; an analyzer responsive to particles in the gas; and electronics to operate the apparatus. The electronics instructs a user to first provide a sample and then provide ambient air into the volume, and then analyzes substantially all of the sample and ambient air for particles.

Abstract: An apparatus and method are presented for the analysis of materials. The apparatus includes two or more similar analyzers, with the output of the analyzers combined to provide improved measurements. The apparatus may be, for example, a differential photometric analyzer, such as the AETHALOMETER®. The apparatus and method includes providing flows to the analyzers such that the rate of accumulation per filter area differs for the two or more analyzers. The output of the apparatus or method may be a concentration, such as the concentration of black carbon particulates. Additionally, the output may be an optical measure of particulates that is useful for characterizing the source or history of the particulates.

Abstract: A method is provided for diagnosing the operation of a photometric particle analyzer. The method may determine when the operation is degraded from normal operating conditions, automatically, and the result displayed locally as well as being transmitted to a remote observer. The present invention may be used by optical photometric particle analyzers, or by analyzers that measure other properties of particles collected on filters.

Abstract: An improved analyzer and method of analyzing the content of carbon-containing particles in samples filtered from an air stream is presented. The air stream may be, for example and without limitation, ambient air impacted by pollution; air breathed in an occupational situation such as the atmosphere in a factory or mine; or a combustion exhaust stream such as an engine tailpipe, a chimney, or a smoke plume. The analyzer may operate without the use of bottled gases, such as unfiltered air, and may be operated to provide a very large dynamic range.

Abstract: An apparatus and method are described for extracting useful work from pressure transients in a pneumatic tire to replace lost air from the tire. The apparatus and method operate continuously and without human intervention. When also used with a pressure relief valve, the apparatus and method permit the tires that are being driven to be maintained at a desired average pressure.

Abstract: An apparatus and method are presented for the analysis of materials. The apparatus includes two or more similar analyzers, with the output of the analyzers combined to provide improved measurements. The apparatus may be, for example, a differential photometric analyzer, such as the AETHALOMETER®. The apparatus and method includes providing flows to the analyzers such that the rate of accumulation per filter area differs for the two or more analyzers. The output of the apparatus or method may be a concentration, such as the concentration of black carbon particulates. Additionally, the output may be an optical measure of particulates that is useful for characterizing the source or history of the particulates.