Abstract: This disclosure describes techniques for delivering high-accuracy and high-precision clock synchronization in heterogeneous distributed computer clusters. For example, the disclosure describes a synchronization engine that sets efficient clock synchronization processes based on a cluster node's characteristics, pricing, precision, geolocation, and/or cluster topology, while in some cases using a combination of master clock data with internal atomic clocks of computers. The techniques described herein integrate the synchronization engine into a time synchronization process that may provide stability, versatility, precision and cost balance using technical improvements for characterizing timing system delivery channels.

Abstract: This disclosure describes techniques for securely, efficiently, and/or effectively providing cryptographic operations and key management services. Systems in accordance with one or more aspects of the present disclosure may provide secure management of cryptographic keys as service to a plurality of data center users or customers that contract for services provided by a data center. In one example, this disclosure describes a data center comprising a plurality of cloud service provider ports, a plurality of customer ports, network infrastructure coupling the plurality of cloud service provider ports to the plurality of customer ports, and a computing system including at least one hardware security module.

Abstract: A method for measuring HVAC efficiency is disclosed which may be used to test various elements within the HVAC system to determine whether any element, such as a heating coil, is operating at an acceptable efficiency when compared to design specifications or previously established standards. The method may also be used to easily determine volumetric flow rate of air through the system at various points simply.

Abstract: Embodiments of a mass impact claw bar are disclosed which may be used as a pry bar or as a tool to separate articles such as trim board from wallboard. The device has a substantially vertical claw at one end and a substantially horizontal claw at the other end. Force is applied to either claw by moving a slidable mass slidably affixed to the claw bar.

Abstract: Embodiments of an automatic self-centering duct robot are disclosed which may be used as a tool platform for cleaning and maintenance of HVAC conduits and ducts. The robot includes sensors and a control system such that it is self-centering and automatically moves along the centerline of a conduit or duct.

Abstract: Embodiments of a apparatus for evenly applying liquids to interior surfaces are disclosed. The apparatus may be used to apply liquids or chemicals to the interior surfaces of a duct or conduit using a rotating sprayer. The speed of rotation of the sprayer may be adjusted such that the liquid or chemical is evenly applied to all interior surfaces of the duct regardless of the cross sectional shape of the duct.

Abstract: Embodiments of a mass impact claw bar are disclosed which may be used as a pry bar or as a tool to separate articles such as trim board from wallboard. The device has a substantially vertical claw at one end and a substantially horizontal claw at the other end. Force is applied to either claw by moving a slidable mass slidably affixed to the claw bar.