Abstract: An optical amplifier comprises a gain medium having an input surface and an output surface wherein the output surface is larger than the input surface. The gain medium may be frustum shaped. The optical amplifier includes a negative diverging lens to receive an extraction laser beam and to cause the laser beam to expand as the beam passes through the gain medium. The amplifier further comprises a positive collimating lens configured to receive the expanding amplified beam and reduce the divergence. The gain medium can be pumped by counter-propagating radiation. The fluence of the laser beam within the gain medium is configured to be near constant along the length of the gain medium and may be within 1.5-2.0 FSAT. The gain medium may be doped with dopant to provide gain, with larger concentration of dopants proximal the input surface and smaller concentration proximal the output surface.

Abstract: A plastic scintillator includes a polymer matrix, an aliphatic additive present in the polymer matrix in an effective amount to impart fog resistance to the plastic scintillator, and at least one fluorescent dye in the polymer matrix, the dye being effective to provide scintillation upon exposure to radiation. The effective amount of the aliphatic additive is in a range of greater than 0 weight percent up to 5 weight percent relative to the total weight of the plastic scintillator. Moreover, the aliphatic additive has a structure comprising up to 300 repeat units.

Abstract: A method for forming a transparent ceramic, in accordance with one embodiment, includes forming a green body by material jetting an ink, and processing the green body to form the ceramic to transparency. A product, in accordance with one embodiment, includes an ink for forming a transparent ceramic. The ink is physically characterized as having a density, surface tension, and viscosity configured to enable material jetting of the ink in contained, sequential droplets having a volume in the range of about 1 picoliter to about 1 nanoliter when jetted from a nozzle having an inner diameter in the range of about 10 microns to about 300 microns. A product, in accordance with another embodiment, includes a transparent ceramic, at least a portion of the transparent ceramic having layers of less than 50 microns per layer with physical characteristics of formation by material jetting.

Abstract: A machine control system can store model weights determined via machine learning using a training dataset correlating preset hydraulic valve displacements to measured movement parameters of a machine component. The machine control system can receive an input command for the component and machine state data from machine sensors. A control mapping model can use the model weights to map a combination of the input command and the machine state data into a predicted displacement of the hydraulic valve that causes movement of the component in response to the input command.

Abstract: A plastic scintillator includes a polymer matrix, an aliphatic additive present in the polymer matrix in an effective amount to impart fog resistance to the plastic scintillator, and at least one fluorescent dye in the polymer matrix, the dye being effective to provide scintillation upon exposure to radiation. The effective amount of the aliphatic additive is in a range of greater than 0 weight percent up to 5 weight percent relative to the total weight of the plastic scintillator. Moreover, the aliphatic additive has a structure comprising up to 300 repeat units.

Abstract: A machine control system can store model weights determined via machine learning using a training dataset correlating preset hydraulic valve displacements to measured movement parameters of a machine component. The machine control system can receive an input command for the component and machine state data from machine sensors. A control mapping model can use the model weights to map a combination of the input command and the machine state data into a predicted displacement of the hydraulic valve that causes movement of the component in response to the input command.

Abstract: The invention includes systems and methods to asymmetrically encrypt audit logs, store a limited period of the encrypted audit logs, periodically send the encrypted audit logs to a central location for storage and further process in order to provide tamper-proof evidence of an activity. The system comprises a secure audit client enabled to perform various activities. A secure audit manager logs such activities in an audit log for uploading to a secure audit server. The secure audit server receives the audit logs from the secure audit manager. Finally a secure audit log consumer requests audit log data from the secure audit log manager to review the secure audit log.

Abstract: An air conditioning filter cleaner for use with an air conditioning system of multiple units. The filter cleaner comprises a brush configured to clean dust from an air filter. The brush is in moving contact with the air filter and driven by a motor. A conduit is connected between the brush and a vacuum source that provides a suction force through the conduit to the brush. The conduit is remotely opened and closed by way of a solenoid or remotely controlled valve. A system controller oversees filter cleaners each connected to a network of ducts, each filter cleaner has an associated valve which opens a duct to which the filter cleaner is connected. A control system selectively actuates the filter cleaner and actuates the associated valve so that dust from the filter is removed to a remote dust collector. Optionally a HEPA filter is provided at a remote collection location.

Abstract: The invention provides novel methods, apparatuses, and systems for securely creating, storing, and transmitting data. The invention enables data exchange between a first and second device. The second device establishes a network session with a first device. An application running on the second device requests the secure messaging service to send a set of application data to the first device via the secure network. The network application initiates a network group session and allocates a relay from the secure messaging service. The first and second device creates an initialization vector and initiates an encrypt cipher stream using the network session key and the initialization vector. The first and second device initiates a decrypt stream using the initialization vector and network session key.

Abstract: The invention includes systems and methods to asymmetrically encrypt audit logs, store a limited period of the encrypted audit logs, periodically send the encrypted audit logs to a central location for storage and further process in order to provide tamper-proof evidence of an activity. The system comprises a secure audit client enabled to perform various activities. A secure audit manager logs such activities in an audit log for uploading to a secure audit server. The secure audit server receives the audit logs from the secure audit manager. Finally a secure audit log consumer requests audit log data from the secure audit log manager to review the secure audit log.

Abstract: This invention includes a system and method to enable a device to determine the presence information of another device over a secure communication network. First, the device and a presence server establish a secure connection. Next, while the initial secure connection with the presence server is established, the device generates a randomly created token and provides it to the presence server. The token is used as a shared-secret by the device and the presence server to secure future presence communications over a non-secure connection. Next, without the need to again enter a password or establish a secure connection with the presence server, the device uses the shared-secret to sign, encrypt and convey presence information to the presence server over an arbitrary connection. Finally, the presence server may share the first device's presence information with another device.

Abstract: According to one embodiment, a scintillator radiation detector system includes a scintillator, and a processing device for processing pulse traces corresponding to light pulses from the scintillator, where the processing device is configured to: process each pulse trace over at least two temporal windows and to use pulse digitization to improve energy resolution of the system. According to another embodiment, a scintillator radiation detector system includes a processing device configured to: fit digitized scintillation waveforms to an algorithm, perform a direct integration of fit parameters, process multiple integration windows for each digitized scintillation waveform to determine a correction factor, and apply the correction factor to each digitized scintillation waveform.

Abstract: This invention includes a system and method to enable a device to determine the presence information of another device over a secure communication network. First, the device and a presence server establish a secure connection. Next, while the initial secure connection with the presence server is established, the device generates a randomly created token and provides it to the presence server. The token is used as a shared-secret by the device and the presence server to secure future presence communications over a non-secure connection. Next, without the need to again enter a password or establish a secure connection with the presence server, the device uses the shared-secret to sign, encrypt and convey presence information to the presence server over an arbitrary connection. Finally, the presence server may share the first device's presence information with another device.

Abstract: This invention includes a system and method to enable a device to determine the presence information of another device over a secure communication network. First, the device and a presence server establish a secure connection. Next, while the initial secure connection with the presence server is established, the device generates a randomly created token and provides it to the presence server. The token is used as a shared-secret by the device and the presence server to secure future presence communications over a non-secure connection. Next, without the need to again enter a password or establish a secure connection with the presence server, the device uses the shared-secret to sign, encrypt and convey presence information to the presence server over an arbitrary connection. Finally, the presence server may share the first device's presence information with another device.

Abstract: According to one embodiment, a scintillator radiation detector system includes a scintillator, and a processing device for processing pulse traces corresponding to light pulses from the scintillator, where the processing device is configured to: process each pulse trace over at least two temporal windows and to use pulse digitization to improve energy resolution of the system. According to another embodiment, a scintillator radiation detector system includes a processing device configured to: fit digitized scintillation waveforms to an algorithm, perform a direct integration of fit parameters, process multiple integration windows for each digitized scintillation waveform to determine a correction factor, and apply the correction factor to each digitized scintillation waveform.

Abstract: A scintillator radiation detector system according to one embodiment includes a scintillator; and a processing device for processing pulse traces corresponding to light pulses from the scintillator, wherein pulse digitization is used to improve energy resolution of the system. A scintillator radiation detector system according to another embodiment includes a processing device for fitting digitized scintillation waveforms to an algorithm based on identifying rise and decay times and performing a direct integration of fit parameters. A method according to yet another embodiment includes processing pulse traces corresponding to light pulses from a scintillator, wherein pulse digitization is used to improve energy resolution of the system. A method in a further embodiment includes fitting digitized scintillation waveforms to an algorithm based on identifying rise and decay times; and performing a direct integration of fit parameters. Additional systems and methods are also presented.

Abstract: A method of managing a digital certificate by a computer system can include the steps of receiving, the at the computer system, a business request for a digital certificate from a requester and transmitting, by the computer system, the request to a first approver. The method can further include, upon approval by the first approver, transmitting, by the computer system, the request to a second approver, upon approval by the second approver, transmitting, by the computer system, the request to a certificate manager, transmitting, by the computer system, the request to an implementer and receiving, by the computer system, from the implementer, technical information related to the request and transmitting, by the computer system, a certificate to a certificate supplier.

Abstract: A scintillator material according to one embodiment includes a bismuth-loaded aromatic polymer having an energy resolution at 662 keV of less than about 10%. A scintillator material according to another embodiment includes a bismuth-loaded aromatic polymer having a fluor incorporated therewith and an energy resolution at 662 keV of less than about 10%. Additional systems and methods are also presented.

Abstract: This invention includes a system and method to enable a device to determine the presence information of another device over a secure communication network. First, the device and a presence server establish a secure connection. Next, while the initial secure connection with the presence server is established, the device generates a randomly created token and provides it to the presence server. The token is used as a shared-secret by the device and the presence server to secure future presence communications over a non-secure connection. Next, without the need to again enter a password or establish a secure connection with the presence server, the device uses the shared-secret to sign, encrypt and convey presence information to the presence server over an arbitrary connection. Finally, the presence server may share the first device's presence information with another device.

Abstract: A method of managing a digital certificate by a computer system can include the steps of receiving, the at the computer system, a business request for a digital certificate from a requester and transmitting, by the computer system, the request to a first approver. The method can further include, upon approval by the first approver, transmitting, by the computer system, the request to a second approver, upon approval by the second approver, transmitting, by the computer system, the request to a certificate manager, transmitting, by the computer system, the request to an implementer and receiving, by the computer system, from the implementer, technical information related to the request and transmitting, by the computer system, a certificate to a certificate supplier.