Abstract: The disclosure provides catalysts for synthesizing polyimides and preparation methods therefor, as well as polyimide compounds. The structural formula of the catalyst may be represented by formula (1): in formula (1), R3 is selected from O or NH; R4 is selected from O or NH; Ar2 is a substituted aryl group, and the substituent of the substituted aryl group comprises a carboxyl group; R5 is selected from a hydrogen atom, a chlorine atom, a bromine atom, an iodine atom, a cyano group, a nitro group, an ester group, an alkyl group, an alkoxy group or a haloalkyl group; and n is an integer ranging from 1 to 4.

Abstract: A motor rotor includes a rotor core and a plurality of reluctance parts. The rotor core includes a plurality of metal parts and an inner hole for the motor rotor, the inner hole of the motor rotor passes through the rotor core, and the areas of the metal parts form a rotor metal total area ?Ametal. The plurality of reluctance parts are disposed surrounding the inner hole of the motor rotor, each of the reluctance parts comprising a plurality of flux barriers penetrating through the rotor core. The areas of the flux barriers in all the reluctance parts form a flux barrier total area ?Aair. The sum of ?Aair and ?Ametal is a rotor effective total area, and the ratio of ?Aair to the rotor effective total area is a flux barrier ratio KA, which is expressed as K A = ? A air ? A air + ? A metal , and satisfies 0.25?KA?0.5.

Abstract: A photoplethysmogram system and method are disclosed. The system includes at least three light sources of different frequencies configured to emit light into a subject's skin. A PPG sensor detects the light from the multiple light sources after it has passed through the subject's skin and generates a PPG signal for each light source. A processor, communicatively coupled to the PPG sensor, receives the PPG signals and estimates physiological parameters from each PPG signal. The light sources may include a red light source, an infrared light source, and a green light source, with the green light source used for calibration in the measurement of blood oxygen saturation. The processor may dynamically perform amputation or imputation of the PPG signals based on the consistency of the signals from the different light sources. The physiological parameters may include respiratory effort and pulse rate and pulse rate variability.

Abstract: The present invention discloses a hacking detection method, including: deploying a plurality of trap IP addresses in a trap IP address list; collecting access logs from a plurality of network devices to create a connection record list, wherein the connection record list includes a plurality of connection records; and comparing the trap IP address list and the connection record list to obtain a suspicious source list. The suspicious source list includes a plurality of suspicious source IP addresses. The suspicious source IP addresses match a portion of the trap IP addresses in the trap IP address list.

Abstract: Provided is a method for labeling a nucleic acid, including providing a target nucleic acid to be labeled; providing a 5?-end glycosylase to react with the target nucleic acid to create an intermediate nucleic acid having an abasic site at a 5?-end; and providing an aldehyde-reactive compound carrying a detectable label for coupling with the intermediate nucleic acid to form a labeled nucleic acid with the detectable label attached at 5?-end. Also provided are a kit and a system for labeling nucleic acids.

Abstract: A diffusive gradients in thin films (DGT) test device for lake water, including: a floating ball and a plurality of water sampling units. A DGT detection device, a water quality detection device with a multi-parameter probe, and a water sampling device are disposed in each of the water sampling units. The water sampling device includes: a plurality of sampling bottles, each of the sampling bottles is provided with an inlet pipe and an exhaust pipe, each of the inlet pipes and exhaust pipes is provided with a one-way solenoid valve; a peristaltic pump, a water sample outlet of the peristaltic pump communicates with the inlet pipes of the plurality of sampling bottles via a multi-way connector; the exhaust pipes of the plurality of sampling bottles are connected to an exhaust manifold via a multi-way connector; a control device connected with the peristaltic pump and each of the one-way solenoid valves.

Abstract: Disclosed herein are modified polymerase compositions exhibiting altered polymerase activity, which can be useful in a variety of biological applications. Also disclosed herein are methods of making and using such compositions. In some embodiments, the compositions exhibit altered properties that can enhance their utility in a variety of biological applications. Such altered properties, can include, for example, altered nucleotide binding affinities, altered nucleotide incorporation kinetics, altered photostability and/or altered nanoparticle tolerance, as well as a range of other properties as disclosed herein.

Abstract: An audio conversion method includes steps as follows. An audio conversion device receives an audio, and obtains an audio compression information according to the audio; a host receives the audio compression information, chooses a transmission setting corresponding to the audio conversion device according to the audio compression information, and starts streaming; the audio conversion device performs corresponding encapsulation and transmission on the audio according to the transmission setting; the host receives the audio, and determines whether the audio needs parsing according to the transmission setting or the audio compression information; and the host parses the audio to obtain an audio format information; the host determines that the audio is a compressed audio with data-burst encapsulation according to the audio format information, and then performs data-burst decapsulation on the compressed audio with data-burst encapsulation, to obtain the compressed audio.

Abstract: Provided herein are compositions and systems for use in polymerase-dependent, nucleotide transient-binding methods. The methods are useful for deducing the sequence of a template nucleic acid molecule and single nucleotide polymorphism (SNP) analyses. The methods rely on the fact that the polymerase transient-binding time for a complementary nucleotide is longer compared to that of a non-complementary nucleotide. The labeled nucleotides transiently-binds the polymerase in a template-dependent manner, but does not incorporate. The methods are conducted under any reaction condition that permits transient binding of a complementary or non-complementary nucleotide to a polymerase, and inhibits nucleotide incorporation.

Abstract: An expansion card frame assembly is configured to support a riser card and an expansion card. The expansion card frame assembly includes a frame, a pivotable component and a stopper. The frame is configured to support the riser card, and the expansion card is configured to be inserted into the riser card. The pivotable component is pivotably disposed on the frame and configured to be located aside the expansion card. The stopper is movably disposed on the pivotable component and configured to be located at one side of the expansion card which is located farther away from the riser card.

Abstract: The present invention relates to a light emitting fabric piece with embedded light source. The light emitting fabric piece comprises lights, cables, optical fiber to conduct light and embedded into fabric, and a controller. The light emitting fabric piece can be part of clothing garments, curtains, wall coverings, furniture coverings, or other fabric applications. The present invention also relates to a device for cutting fiber optic fabric to create dense light points in patterns and a method and assembly to prepare an optical fiber bundle.

Abstract: Presented herein are polymerase enzymes for improved incorporation of nucleotide analogues, in particular nucleotides which are modified at the 3? sugar hydroxyl, as well as methods and kits using the same.

Abstract: Provided herein relates to DNA polymerase variants and kits including the same, where the DNA polymerase variant has an improved function and activity of performing template-independent nucleic acids synthesis using canonical nucleotides and non-canonical nucleotide analogues in a thermotolerant manner.

Abstract: The present application provides a heat dissipation system and method for electronic devices. The system includes a heat dissipation unit attached to electronic component of an electronic device, a temperature and humidity sensor, a cooling unit and a controller. The controller is configured to obtain the dew point temperature of the space in which the cooling unit is disposed and to determine a coolant flow rate based on the dew point and the coolant temperature. In the event where the difference between the coolant temperature and the dew point is greater than a threshold, the heat dissipation unit receives the coolant under a first flow rate. In the event where the difference between the coolant temperature and the dew point is equal to or less than the threshold, the heat dissipation unit receives the coolant under a second flow rate lower than the first flow rate.

Abstract: Disclosed herein is a specific B-family DNA polymerase variants that exhibit an improved incorporation of nucleotide analogues for synthesizing polynucleotides and sequencing the associated nucleic acid template. More particularly, the DNA sequencing-by-synthesis method can be efficiently performed by said B-family DNA polymerase variants with a normal nucleic acid template and reversible dye-terminator nucleotides to precisely determine the sequence of associated nucleic acid template.

Abstract: A resistor structure includes a resistor body; and a first electrode structure disposed at and being in electric contact with a first end of the resistor body, and a second electrode structure disposed at and being in electric contact with a second end opposite to the first end of the resistor body. Each of the first electrode structure and the second electrode structure has at least one conductive protrusion. The at least one conductive protrusion of the first electrode structure and the at least one conductive protrusion of the second electrode structure both serve as voltage-sensing terminals for electric connection to an external voltage measurement device, or both serve as current-sensing terminals for electric connection to a current measurement device.

Abstract: The present invention relates to a light emitting fabric piece with embedded light source. The light emitting fabric piece comprises lights, cables, optical fiber to conduct light and embedded into fabric, and a controller. The light emitting fabric piece can be part of clothing garments, curtains, wall coverings, furniture coverings, or other fabric applications. The present invention also relates to a device for cutting fiber optic fabric to create dense light points in patterns and a method and assembly to prepare an optical fiber bundle.

Abstract: A surface acoustic wave (SAW) device includes: a substrate; a finger portion of an interdigital transducer (IDT) electrode disposed on the substrate; a pad portion of the interdigital transducer electrode electrically connected to the finger portion; and a wiring electrode disposed on the pad portion. The wiring electrode includes a contact metal layer and an aluminum-based layer. The contact metal layer is disposed between the pad portion and the aluminum-based layer. The contact metal layer includes platinum, palladium, or gold.

Abstract: An optical lens group for augmented reality (AR) near-eye display includes a primary lens and an auxiliary lens. An image presented by a microdisplay is enlarged by the optical lens group to form a virtual image which can be observed by an eye of a user. A shape of an outermost surface of the optical lens group can be changed to meet requirements of different diopters. The optical lens group has a primary lens mainly used for image information transmission and image enlargement and an auxiliary lens close to at least one surface of the primary lens. The auxiliary lens is arranged on a lower side or an outer side of the primary lens without propagating any image light signal from a micro image display.

Abstract: An ultra-thin lens for augmented reality (AR) display includes: a primary lens, an intermediate lens, and a secondary lens. After entering the primary lens, image light undergoes two total reflections, then enters the intermediate lens and is partially reflected, then is directed to a human eye through the intermediate lens and the primary lens. The secondary lens is configured on the other side of the intermediate lens, and environmental light is directed to the human eye through the secondary lens, the intermediate lens, and the primary lens. According to the ultra-thin lens, total reflection and light splitting functions of the image light are realized respectively through the primary lens and the intermediate lens, so that the entire lens has a thin and light profile.