Abstract: Provided are an isolated oligonucleotide and a use thereof in nucleic acid sequencing, wherein the isolated oligonucleotide comprises a first strand, wherein the 5?-end nucleotide of the first strand has a phosphate group, and the 3?-end nucleotide of the first strand is a dideoxynucleotide, and a second strand, wherein the 5?-end nucleotide of the second strand does not have a phosphate group, and the 3?-end nucleotide of the second strand is a dideoxynucleotide, wherein the first strand is longer than the second strand in length, and a double-stranded structure is formed between the first strand and the second strand.

Abstract: Provided is an electro-optical phase modulation system, including: an electro-optical crystal, a radio frequency circuit and a light source, light incident surface of the electro-optical crystal is in parallel with light exit surface, upper electrode surface thereof is in parallel with lower electrode surface, and an angle between light incident surface and upper electrode surface is Brewster angle; two electrodes of radio frequency circuit are connected to upper and lower electrode surfaces respectively, for transmitting radio frequency signals to upper and lower electrode surfaces, so that an electric filed, direction of which is perpendicular to upper electrode surface, is formed between upper and lower electrode surfaces; light source is located at a side of light incident surface, and incidence angle of beams from light source with respect to light incident surface is Brewster angle. The system is used to reduce residual amplitude modulation, and increase accuracy of phase modulation.

Abstract: A method of determining the length of a cable coupled to a transceiver of a network device includes transmitting a first series of pulses of a first pulse width onto a cable, receiving reflections of the first series of pulses, transmitting a second series of pulses of a second pulse width onto the cable, and receiving reflections of the second series of pulses. The second pulse width is wider than the first pulse width. It is determined whether the reflections of the first series of pulses satisfy a criterion. The length of the cable is calculated using either the reflections of the first series of pulses or the reflections of the second series of pulses, based at least in part on whether the reflections of the first series of pulses satisfy the criterion.

Abstract: A tunable laser with multiple in-line sections generally includes a semiconductor laser body with a plurality of in-line laser sections each configured to be driven independently to generate laser light at a wavelength within a different respective wavelength range. The wavelength of the light generated in each of the laser sections may be tuned, in response to a temperature change, to a channel wavelength within the respective wavelength range. A switch module may be configured to couple a signal from a laser driver to a selected one of the plurality of in-line laser sections, wherein the signal modulates the laser light generated by the in-line laser section. The selected in-line section may be DC biased to a lasing state and the non-selected in-line sections may be DC biased to a non-lasing or transparent state.

Abstract: System and methods for detecting surge conditions in a compressor system are presented. In some embodiments, a method for detecting surge conditions may include receiving a plurality of flow measurements relating to a flow rate through the compressor system. Amplitude calculations may be performed based on at least one of the plurality of flow measurements to identify a possible surge condition. Frequency calculations may also be performed to identify a possible surge condition. A surge condition may be detected based on the results of the amplitude calculation and the frequency calculation and, in response, a surge detection control signal may be generated.

Abstract: The invention relates to a method of forming high aspect ratio titanate nanotubes. In particular, the formation of elongated nanotubes having lengths more than 10 ?m involves a modified hydrothermal method. The method allows formation of an entangled network of the elongated nanotubes for use as free-standing membranes or powder form for use in various applications such as water treatment. The elongated nanotubes may also be used for forming electrodes for batteries.

Abstract: Disclosed herein are systems and methods for monitoring and controlling a flow of air within a fuel cell stack. The fuel cell stack may include an air supply path to conduct a flow of air through the fuel cell. Sensors may be configured to determine parameters associated with the air supply path, such as pressure, flow rate, etc. A modeling system may further be configured to determine a modeled parameter associated with the air supply path. A control system may receive input from the one or more sensors and the modeling system to generate a baseline based on the measured parameter and the modeled parameter, determine a difference between the measured parameter and the modeled parameter, determine a change of the difference with respect to the baseline, determine that the change satisfies a criterion, and selectively implement a corrective action based upon satisfaction of the criterion.

Abstract: The present disclosure provides a dynamic adjustment device for adjusting video resolution. The dynamic adjustment device includes an attributive character obtaining unit configured for obtaining attributive characters of captured video images, which are captured during video capturing; and a resolution adjustment unit configured for dynamically adjusting the video resolution of a current video according to the obtained attributive character. The present disclosure further provides a dynamic adjustment method and a terminal for adjusting video resolution. By means of the technical solution of the present disclosure, the video resolution can be dynamically adjusted according to an actual situation in a procedure of capturing a video, so as to not only ensure the quality of the captured video but also effectively save storage space without interrupting video capturing.

Abstract: A system and method for utilizing a pressurized volume of oxygen in a cathode plumbing of a fuel cell system. The system and method includes calculating an air/oxygen balance that is based on an air balance and an oxygen balance in the cathode plumbing. The system and method further include determining the number of moles of oxygen available for fuel cell chemical reactions using the calculated air/oxygen balance and drawing current from a fuel cell stack using the moles of oxygen available for fuel cell chemical reactions.

Abstract: Many applications in cell biology, genetic engineering, cell-based therapeutics, and drug discovery require precise and safe methods for introducing membrane-impermeable molecules into cells. This can be implemented satisfactorily by microinjection. However, disadvantages of traditional manual microinjection include high degree of operator skill, low throughput and labor-intensiveness. Many studies have focused on developing automated and high-throughput systems for microinjection to address these limitations. However, none have provided sufficient throughput for applications such as ex vivo cell therapy, where manipulation of many cells is helpful.

Abstract: A tunable laser with multiple in-line sections generally includes a semiconductor laser body with a plurality of in-line laser sections each configured to be driven independently to generate laser light at a wavelength within a different respective wavelength range. The wavelength of the light generated in each of the laser sections may be tuned, in response to a temperature change, to a channel wavelength within the respective wavelength range. A switch module may be configured to couple a signal from a laser driver to a selected one of the plurality of in-line laser sections, wherein the signal modulates the laser light generated by the in-line laser section. The selected in-line section may be DC biased to a lasing state and the non-selected in-line sections may be DC biased to a non-lasing or transparent state.

Abstract: Systems and methods to control compressor recirculation of a reactant in a fuel cell system. A recirculation valve flow setpoint value for a gas flow to the recirculation valve is calculated based on a received cathode flow setpoint. A value corresponding to a predicted recirculation valve position is generated, and can be used as a control command for changing the position of the recirculation valve to reduce the valve response time during operational transients of the fuel cell system.

Abstract: A method of determining the length of a cable coupled to a transceiver of a network device includes transmitting a first series of pulses of a first pulse width onto a cable, receiving reflections of the first series of pulses, transmitting a second series of pulses of a second pulse width onto the cable, and receiving reflections of the second series of pulses. The second pulse width is wider than the first pulse width. It is determined whether the reflections of the first series of pulses satisfy a criterion. The length of the cable is calculated using either the reflections of the first series of pulses or the reflections of the second series of pulses, based at least in part on whether the reflections of the first series of pulses satisfy the criterion.

Abstract: A method and device for predictively controlling the speed of a compressor used in conjunction with a fuel cell stack. Feedforward command signals are generated based on fuel cell stack setpoints that are based on stack humidification requirements. A pressure drop model uses these setpoints to determine a compressor outlet pressure setpoint change brought about by an operational transient. A recursive approach is used to solve for one or more future or desired compressor operating conditions. The results of this recursive approach are used to determine the feedforward speed command of the compressor, where known operational parameters (such as can be found on a compressor map) may be used. This permits rapid changes in compressor speed to comply with the new operating point of the fuel cell system that is brought about by the operational transient.

Abstract: Devices and methods to control a cathode backpressure valve and a bypass valve in a vehicle fuel cell system. A feedforward-based control strategy is used to control the cathode backpressure valve. The control over the bypass valve is integrated into the control over the cathode backpressure valve. Such a control strategy acts in a predictive manner to improve valve response to transitory cathode pressure and bypass flow split setpoints in the system.

Abstract: System and methods for setting pressure limits for an air supply of a fuel cell (“FC”) system are presented. Certain embodiments disclosed herein may allow a FC system to calculate a minimum and a maximum FC stack cathode inlet pressure based on different operating conditions while ensuring that the FC stack receives a desired air flow. Further embodiments disclosed herein may allow a FC system to maintain a cathode inlet air pressure within a range that protects an associated compressor from entering surge and/or overheating conditions.

Abstract: System and methods for detecting surge conditions in a compressor system are presented. In some embodiments, a method for detecting surge conditions may include receiving a plurality of flow measurements relating to a flow rate through the compressor system. Amplitude calculations may be performed based on at least one of the plurality of flow measurements to identify a possible surge condition. Frequency calculations may also be performed to identify a possible surge condition. A surge condition may be detected based on the results of the amplitude calculation and the frequency calculation and, in response, a surge detection control signal may be generated.

Abstract: Systems and methods to control fuel cell stack pressure through a cathode backpressure valve. A flow offset value is used as a capacitance term during transient operational conditions to account for discrepancies between the stack flow setpoint and the actual stack flow. The capacitance term is based on operational parameters, including stack pressure changes, stack coolant temperature and stack volume. The additional flow produced by the capacitance terms may be fed, along with pressure drop models and a valve position model to provide a more accurate prediction of valve position.

Abstract: Disclosed herein are systems and methods for monitoring and controlling a flow of air within a fuel cell stack. The fuel cell stack may include an air supply path to conduct a flow of air through the fuel cell. Sensors may be configured to determine parameters associated with the air supply path, such as pressure, flow rate, etc. A modeling system may further be configured to determine a modeled parameter associated with the air supply path. A control system may receive input from the one or more sensors and the modeling system to generate a baseline based on the measured parameter and the modeled parameter, determine a difference between the measured parameter and the modeled parameter, determine a change of the difference with respect to the baseline, determine that the change satisfies a criterion, and selectively implement a corrective action based upon satisfaction of the criterion.

Abstract: Systems and methods to mitigate surge conditions in a compressor of a vehicle fuel cell system. A first surge mitigation strategy regulates a cathode backpressure valve, if the compressor is operating at or above a threshold speed. A second surge mitigation strategy regulates a recirculation valve if the compressor is operating below the threshold speed. In one form, a feedback-based control may be used as part of a larger feedforward-based control strategy such that the mitigation is part of a reactive control strategy. The strategy may additionally be implemented in a processor-based controller.