Abstract: A diaphragm for use in an audio transducer (e.g., a coaxial loudspeaker) includes a higher frequency transducer and a lower frequency transducer. The diaphragm is a component of the lower frequency transducer and is arranged coaxially with the higher frequency transducer. The diaphragm includes a first surface and an opposing second surface. The first surface has a profile shaped to define a horn for output from the higher frequency transducer and the geometry of the first surface is independent of the geometry of the second surface.

Abstract: A coaxial loudspeaker includes a cone of a woofer; a waveguide of a tweeter, located at a front end towards the outside/large profile of the cone; and a first cavity. The first cavity includes a resonator and a cavity formed in the cone, and the resonator communicates with the cavity at the large profile of the cone. A side opposite to a position where the resonator communicates with the cavity is constructed as an orifice plate. The orifice plate is adjacent to the resonator and an orifice portion of the orifice plate communicates with the resonator.

Abstract: Techniques regarding guanidinium functionalized polylysine polymers that can have antimicrobial and/or anticancer activity are provided. For example, one or more embodiments described herein can comprise a chemical composition, which can comprise a polymer comprising a molecular backbone covalently bonded to a pendent guanidinium functional group, wherein the molecular backbone can comprise a polylysine structure.

Abstract: An electronic parking meter mechanism is provided. The electronic meter mechanism includes an inner housing, an electronic display screen and a wireless communication subsystem configured to wirelessly communicate with a parking management system. The electronic meter mechanism includes a first processor configured to control the electronic display screen, and a second processor configured to control communication of data by the wireless communication subsystem.

Abstract: An electronic parking meter mechanism is provided. The electronic meter mechanism includes an inner housing, an electronic display screen and a wireless communication subsystem configured to wirelessly communicate with a parking management system. The electronic meter mechanism includes a first processor configured to control the electronic display screen, and a second processor configured to control communication of data by the wireless communication subsystem.

Abstract: Techniques regarding chemical compounds comprising perfluoroaryl groups that can facilitate post-synthesis functionalization are provided. For example, one or more embodiments described herein can comprise a chemical compound. The chemical compound can comprise a molecular backbone. The chemical compound can also comprise a pendent functional group bonded to the molecular backbone. The pendent functional group can comprise a perfluoroaryl group and a methylene group.

Abstract: An electronic parking meter mechanism is provided. The electronic meter mechanism includes an inner housing, an electronic display screen and a wireless communication subsystem configured to wirelessly communicate with a parking management system. The electronic meter mechanism includes a first processor configured to control the electronic display screen, and a second processor configured to control communication of data by the wireless communication subsystem.

Abstract: An electronic single-space parking meter mechanism is provided. The electronic single-space parking meter mechanism includes an inner housing having a front side and a rear side. The meter mechanism includes wireless communications hardware including an antenna. The meter mechanism includes a payment reader supported by the inner housing and an electronic display screen supported by the inner housing. At least a portion of the antenna is located above at least a portion of the electronic display screen.

Abstract: A parking system is provided. The parking system includes a computerized parking management system and at least one single-space parking meter configured to communicate parking data between the single-space parking meter and the parking management system via a wireless network. The system includes a mobile citation unit configured to communicate parking enforcement data between the mobile citation unit and the parking management system via the wireless network. The parking management system processes and stores parking data received from the single-space parking meters and processes and stores enforcement data from the mobile citation unit.

Abstract: In some embodiments, a wastewater treatment system may reduce contaminants in water. A system may include one or more bioreactors which include a substrate that supports a biofilm. The bacteria used to form the biofilm may be selected to maximize the reduction of contaminants in water. Various components of the wastewater treatment system may be optimized to improve the efficiency and energy consumption of the wastewater system.

Abstract: An electronic parking meter mechanism is provided. The electronic meter mechanism includes an inner housing, an electronic display screen and a wireless communication subsystem configured to wirelessly communicate with a parking management system. The electronic meter mechanism includes a first processor configured to control the electronic display screen, and a second processor configured to control communication of data by the wireless communication subsystem.

Abstract: An electronic single-space parking meter mechanism is provided. The electronic single-space parking meter mechanism includes an inner housing having a front side and a rear side. The meter mechanism includes wireless communications hardware including an antenna. The meter mechanism includes a payment reader supported by the inner housing and an electronic display screen supported by the inner housing. At least a portion of the antenna is located above at least a portion of the electronic display screen.

Abstract: A single space electronic parking meter mechanism for inserting into an outer parking meter housing is provided. The mechanism includes an inner housing, a payment receiving structure supported by the inner housing and an electronic display screen supported by the inner housing. The mechanism also includes a wireless communication subsystem supported by the inner housing configured to wirelessly communicate with a parking management system and an electronic meter control system controlling the electronic display and the wireless communications subsystem. The mechanism includes a memory device receiving port externally accessible through the inner housing and a read-write removable memory device physically accessible from outside of the inner housing and configured to be coupled to the memory device receiving port. The removable memory device including operation mode information that is read by the electronic meter control system to select an operation mode of the meter mechanism.

Abstract: An electronic parking meter mechanism is provided. The electronic meter mechanism includes an inner housing, an electronic display screen and a wireless communication subsystem configured to wirelessly communicate with a parking management system. The electronic meter mechanism includes a first processor configured to control the electronic display screen, and a second processor configured to control communication of data by the wireless communication subsystem.

Abstract: In some embodiments, a system may reduce contaminants in water. A system may include a biofilm in a container. The biofilm may be formed from one or more bacteria coupled to one or more substrates. The bacteria may be selected to maximize the reduction of contaminants in water. The system may include one or more bacteria generators to provide bacteria to the biofilm and/or one or more air sources to provide an air bubble stream to the container and/or the bacteria generator. In some embodiments, bacteria may be preserved in a starvation phase. Bacteria may be incubated until they reach a starvation phase. The bacteria may then be preserved as beads or immobilized on a substrate. The preserved bacteria may be used in a system for the reduction of contaminants in water.

Abstract: An electronic single space parking meter associated with a parking space is provided. The meter includes a support pole and an electronic meter mechanism coupled to and supported from the support pole. The electronic meter mechanism includes a processor. The meter includes a vehicle sensor communicably coupled to the processor of the electronic meter mechanism. The vehicle sensor is configured to detect a vehicle located within the parking space. The vehicle sensor is coupled to and supported by the support pole at a position above the ground and below the electronic meter mechanism.

Abstract: A single space electronic parking meter mechanism for inserting into an outer parking meter housing is provided. The mechanism includes an inner housing, a payment receiving structure supported by the inner housing and an electronic display screen supported by the inner housing. The mechanism also includes a wireless communication subsystem supported by the inner housing configured to wirelessly communicate with a parking management system and an electronic meter control system controlling the electronic display and the wireless communications subsystem. The mechanism includes a memory device receiving port externally accessible through the inner housing and a read-write removable memory device physically accessible from outside of the inner housing and configured to be coupled to the memory device receiving port. The removable memory device including operation mode information that is read by the electronic meter control system to select an operation mode of the meter mechanism.

Abstract: A single space electronic parking meter mechanism for inserting into an outer parking meter housing is provided. The mechanism includes an inner housing, a payment receiving structure supported by the inner housing and an electronic display screen supported by the inner housing. The mechanism also includes a wireless communication subsystem supported by the inner housing configured to wirelessly communicate with a parking management system and an electronic meter control system controlling the electronic display and the wireless communications subsystem. The mechanism includes a memory device receiving port externally accessible through the inner housing and a read-write removable memory device physically accessible from outside of the inner housing and configured to be coupled to the memory device receiving port. The removable memory device including operation mode information that is read by the electronic meter control system to select an operation mode of the meter mechanism.