摘要:
Systems and methods utilize a distributed server network to allow for the optimization of the upload of a data stream from a computing device. Performance metrics are estimated for different network paths from the computing device to a variety of entry servers in the distributed server network. Based on the estimated performance metrics, one or more entry servers are then selected to receive the data stream from the computing device. As a result, the systems and methods described herein allow for high quality upload performance which addresses the first mile vulnerability issues of the data stream. The distributed server network can then transmit copies of the data stream in real-time to other computing devices.
摘要:
Systems and methods utilize a distributed server network to allow for the optimization of the upload of a data stream from a computing device. Performance metrics are estimated for different network paths from the computing device to a variety of entry servers in the distributed server network. Based on the estimated performance metrics, one or more entry servers are then selected to receive the data stream from the computing device. As a result, the systems and methods described herein allow for high quality upload performance which addresses the first mile vulnerability issues of the data stream. The distributed server network can then transmit copies of the data stream in real-time to other computing devices.
摘要:
Systems and methods described herein utilize a distributed server network to allow for the real-time distribution of copies of a data stream uploaded from a computing device. The uploaded data stream corresponds to an environment surrounding a user (exam taker) of the computing device during execution of a testing routine for an examination. Providing copies of the data stream in real-time allows proctors as well as other test assessment authorities to ‘peek in’ on the exam taker's environment during the exam. As a result, the environment surrounding the exam taker can be monitored in real-time to determine whether any visual or audio activity in the environment constitutes activity not in accordance with the exam protocol. Following an affirmative determination that the exam taker violated an exam taking protocol, a proctor or other test assessment authority can then make a final or early decision regarding disciplinary action.
摘要:
Systems and methods described herein utilize a distributed server network to allow for the real-time distribution of copies of a data stream uploaded from a computing device. The uploaded data stream corresponds to an environment surrounding a user (exam taker) of the computing device during execution of a testing routine for an examination. Providing copies of the data stream in real-time allows proctors as well as other test assessment authorities to ‘peek in’ on the exam taker's environment during the exam. As a result, the environment surrounding the exam taker can be monitored in real-time to determine whether any visual or audio activity in the environment constitutes activity not in accordance with the exam protocol. Following an affirmative determination that the exam taker violated an exam taking protocol, a proctor or other test assessment authority can then make a final or early decision regarding disciplinary action.
摘要:
An instrument and associated method are disclosed for preparing samples for column chromatography. The method includes the steps of applying microwave energy to a sample composition containing at least one solvent to encourage a chemical reaction and generate desired products, thereafter mixing an absorbent media with the sample to absorb the solvent, the media being compatible with liquid chromatography that will separate the expected products, being chemically inert to the expected products, and being added in an amount sufficient to provide a substantially dry mixture of the media and the sample, but less than an amount that overly broadens the resolution of the sample during liquid chromatography, thereafter applying microwave energy to the dry mixture of the media and the sample to thereby encourage the solvent to evaporate under the influence of the microwave energy, and thereafter adding the dry mixture of the media and the remaining sample to a liquid chromatography column and separating the components of the remaining sample for identification and purification purposes.
摘要:
The invention is a method and associated instrument for microwave assisted chemistry. The invention includes the steps of directing a continuous flow of fluid through a microwave cavity while applying microwave radiation to the cavity and to the continuous flow of materials therein, monitoring the pressure of the fluid in the cavity; and cooling the fluid in the cavity when the pressure exceeds a predetermined setpoint pressure.
摘要:
The invention is an instrument and method for microwave-assisted chemical synthesis. The instrument includes a source of microwave radiation for applying microwave energy to a sample, a microwave cavity in wave communication with the source for holding the sample during the application of microwave energy, and a substantially monochromatic radiation source in electromagnetic communication with the cavity for applying substantially monochromatic light to the sample. The instrument further includes a detector positioned to detect Raman scattering of light from the monochromatic source by the sample, and a controller in signal communication with the microwave energy source and the Raman scattering detector for moderating the application of microwave energy to the sample based upon the detected Raman scattering.
摘要:
An instrument and associated method are disclosed for preparing samples for column chromatography. The method includes the steps of applying microwave energy to a sample composition containing at least one solvent to encourage a chemical reaction and generate desired products, thereafter mixing an absorbent media with the sample to absorb the solvent, the media being compatible with liquid chromatography that will separate the expected products, being chemically inert to the expected products, and being added in an amount sufficient to provide a substantially dry mixture of the media and the sample, but less than an amount that overly broadens the resolution of the sample during liquid chromatography, thereafter applying microwave energy to the dry mixture of the media and the sample to thereby encourage the solvent to evaporate under the influence of the microwave energy, and thereafter adding the dry mixture of the media and the remaining sample to a liquid chromatography column and separating the components of the remaining sample for identification and purification purposes.
摘要:
A system for launching a target disk above a terrestrial surface, including a first support, a first bracket attached to the first support, a second support connected to the first bracket and configured to pivot with respect to the first bracket in a first plane, and a second bracket attached to the second support and configured to pivot with respect to the second bracket in a second plane, the second plane being generally perpendicular to the first plane. A launching structure is attached to the second bracket, and the second support is configured to pivot with the second bracket. A track is configured to hold and direct the target upon launching, the track being configurable to present the target to be launched in a first presentation generally parallel to the terrestrial surface and a second presentation generally perpendicular to the terrestrial surface.
摘要:
Systems for monitoring or control can include reconfigurable input and output channels. Such reconfigurable channels can include as few as a single terminal and a ground pin, or such channels can include three or four terminal configuration such as for use in four-terminal resistance measurements. Channel reconfiguration can be accomplished such as using software-enabled or firmware-enabled control of channel hardware. Such channel hardware can include analog-to-digital and digital-to-analog conversion capability, including use of a digital-to-analog converter to provide field power or biasing. In an example, the interface circuit can provide a selectable impedance.