Abstract: A multi-chamber single-use bioreactor for cell culture expansion has bag assembly and a rigid support structure defining a bag receiving space. The bag assembly disposed in the bag receiving space of the rigid support structure and supported by the rigid support structure. The bag assembly has at least a first flexible bag and a second flexible bag. The first bag defines a first reaction chamber, and the second bag defines a second reaction chamber. The first reaction chamber has a first volume, a first inlet, and a first outlet, and the second reaction chamber has a second volume different from the first volume, a second inlet, and a second outlet. The second inlet of the second bag is fluidically connected to the first outlet of the first bag so liquid in first reaction chamber can be transferred to the second reaction chamber.

Abstract: Fluid loss from a wellbore into a subterranean formation may be reduced by forming a fluid barrier of a crosslinked alginate.

Abstract: Aspects of this disclosure relate to an antenna array system and method of calibration using power and/or phase detectors equidistant between transmit paths of antenna array channels, and using power and/or phase detectors equidistant between receive paths of antenna array channels. In some aspects, the antenna array can calibrate the power and/or phase detectors based on a common signal transmitted from an output of a transmit path and/or an output of a receive path of a channel. In some aspects, the antenna array can calibrate receive and transmit paths across antenna array chips.

Abstract: Aspects of this disclosure relate to an antenna array system and method of calibration using power and/or phase detectors equidistant between transmit paths of antenna array channels, and using power and/or phase detectors equidistant between receive paths of antenna array channels. In some aspects, the antenna array can calibrate the power and/or phase detectors based on a common signal transmitted from an output of a transmit path and/or an output of a receive path of a channel. In some aspects, the antenna array can calibrate receive and transmit paths across antenna array chips.

Abstract: According to one or more embodiments, an internal combustion engine may be operated by a method including one or more of the steps of passing a first fuel and a second fuel into a combustion chamber of an engine cylinder to form a fuel mixture, and combusting the fuel mixture with a spark plug to translate the piston housed in the engine cylinder and rotate a crank shaft coupled to the piston. The engine cylinder may include a cylinder head and cylinder sidewalls, and the combustion chamber may be defined at least partially by the cylinder head, the cylinder sidewalls, and the piston. The first fuel may include a greater octane rating than the second fuel. The combustion chamber may include an end gas region and a central region, the central region more near to the spark plug than the end gas region.

Abstract: According to one or more embodiments, an internal combustion engine may be operated by a method including one or more of the steps of passing a first fuel and a second fuel into a combustion chamber of an engine cylinder to form a fuel mixture, and combusting the fuel mixture with a spark plug to translate the piston housed in the engine cylinder and rotate a crank shaft coupled to the piston. The engine cylinder may include a cylinder head and cylinder sidewalls, and the combustion chamber may be defined at least partially by the cylinder head, the cylinder sidewalls, and the piston. The first fuel may include a greater octane rating than the second fuel. The combustion chamber may include an end gas region and a central region, the central region more near to the spark plug than the end gas region.

Abstract: Improved facial recognition tracking of individuals throughout a space is provided, as is identification of unexpected behavior. The system can configure itself upon setup and adjust to changing conditions, and is able to intelligently reduce the workload on the facial recognition system. Cameras are placed throughout a building and learn what typical traffic within the building looks like. Over time, the system can track multiple users throughout the system and can automatically learn the average time between cameras. A probability function for each camera can also be determined that give probabilities for each camera to camera path. This approach provides for both limiting the bandwidth and processing power required for facial recognition and also allows for behavioral analysis. This system could be implemented as a distributed system of cameras, each performing its own facial recognition and tracking, and/or with distributed cameras combined with central processing for facial recognition.

Abstract: A low dropout voltage regulator (LDO) is presented that takes into consideration short channel effects of the pass transistor in suppressing ripples that are present at the input node of the LDO from appearing at the output node of the LDO. The LDO feeds the input ripple voltage to the gate of the pass transistor in such a way that the ripple currents through the pass transistor associated with both the transconductance and the output resistance of the pass transistor are suppressed. In one embodiment, the LDO is provided stability by using only on-chip capacitors. The size of on-chip capacitors is advantageously reduced by connecting a compensation capacitance to an internal node of an error amplifier. The LDO provides stable operation even at small load currents. The LDO also provides good suppression of ripples for a wide range of frequencies.

Abstract: A low dropout voltage regulator (LDO) is presented that takes into consideration short channel effects of the pass transistor in suppressing ripples that are present at the input node of the LDO from appearing at the output node of the LDO. A sum of the input ripple voltage and the input ripple voltage multiplied by a gain equal to the reciprocal of the intrinsic gain provided by the pass transistor is fed to the gate of the pass transistor. In one embodiment an adaptive stage is utilized to provide the sum to the gate of the pass transistor. The adaptive stage gain adapts to change changing load currents such that the gate voltage is maintained substantially equal to the sum. In another embodiment, the LDO is provided stability by using only on-chip capacitors. The LDO provides stable operation even at small load currents.