Abstract: A materialization configuration request is received via a programmatic interface from a client of a journal-based multi-data-store database. The request indicates a partitioning rule to be used to select, for respective writes indicated in committed transaction entries of a journal, the materialization node at which the writes are to be stored. A control plane component of the database verifies that a set of materialization nodes corresponding to the partitioning rule has been established, and initiates the propagation of writes from the journal to the materialization nodes by respective write appliers.

Abstract: A face mask filter holder (2) for holding a filter (20) is provided, the filter holder (2) comprising a support structure and a perimeter part (8) configured to receive at least part of an edge of the filter. The support structure comprises a first part (4), positionable over a first nostril (7), and a second part (6), positionable over a second nostril (9). With the support structure in an open configuration, the filter is insertable in a recess between the first part (4) and the second part (6), and the edge of the filter is receivable by the perimeter part (8).

Abstract: A gold detection apparatus capable of detecting gold in field mineral samples such as rock or soil with little or no preparation. Light in red, green and violet wavelengths is directed at a surface of a mineral sample and the reflected light intensity is measured by an array of sensors or photosites. Based on the characteristic reflectance properties of gold, the reflected light intensity in each wavelength is used to determine the presence of gold particles and the gold concentration of the mineral sample.

Abstract: A gold detection apparatus capable of detecting gold in field mineral samples such as rock or soil with little or no preparation. Light in red, green and violet wavelengths is directed at a surface of a mineral sample and the reflected light intensity is measured by an array of sensors or photosites. Based on the characteristic reflectance properties of gold, the reflected light intensity in each wavelength is used to determine the presence of gold particles and the gold concentration of the mineral sample.

Abstract: A control system for a work site including an autonomous machine includes a central control system that includes a cluster of servers configured to execute an autonomous control server application on exactly one of the cluster of servers. A RAID system is in communication with the cluster of servers. A first switch interconnects a first network with the cluster of servers, and a second switch interconnects a second network with the cluster of servers. A UPS system interconnects a power source with the cluster of servers, the RAID system, and the first and second switches. The machine control system is communicatively coupled with the central control system via a wireless network and one of the first and second networks. The machine control system transmits machine position information to the autonomous control server application and receives a route plan generated by the autonomous control server application.