Abstract: The present invention relates to a layered semi-parallel LDPC decoder system having a single permutation network, and belongs to the field of decoder hardware design. The system comprises a layered decoding architecture of the single permutation network, a layered semi-parallel decoding architecture of the single permutation network, a pipeline design for layered semi-parallel decoding and a hardware framework of a layered semi-parallel LDPC decoder. The present invention removes a permutation network module between a check node and a variable node by modifying the cyclic shift value of each information block transferred from the variable node to the check node, i.e., the cyclic shift operation of the decoder can be completed through the single permutation network so as to reduce hardware resources of the decoder. A semi-parallel decoding structure is adopted, and meanwhile, a pipeline is added between half layers.

Abstract: The present disclosure relates to a method and apparatus for determining a relative energy between systems, an electronic device, a computer-readable storage medium, and a computer program product. The method includes: for a chemical system, performing a plurality of iteration rounds using a neural network variational Monte Carlo method; acquiring a linear relationship between energy errors and energy variances, which are obtained in the plurality of iteration rounds; determining a first energy error at a position where the energy variance is zero based on the linear relationship; and determining the relative energy between the chemical system and a further system based on the first energy error.

Abstract: Disclosed are apparatus, electronic device, and method for stitching dual-camera images. The method includes collecting two images having overlapping photographic content. The method includes extracting and matching feature points of the two images. The method includes roughly aligning the two images by using a homography matrix. The method includes accurately aligning the two images by using a least squares method to complete stitching the two images.

Abstract: The present application discloses an intelligent frequency reading method applicable to a low-temperature environment and a wireless vibrating wire acquisition instrument.

Abstract: The disclosure provides a vibrating wire compressive stress gauge and stress testing equipment suitable for use in low-temperature environments. By providing a stress trigger sleeve made of elastic material, the concrete structure of the lining itself expands when it is affected by high or low temperatures, extruding the stress trigger sleeve, and the extrusion force is offset through the elastic force of the elastic material, thereby preventing the expansion force from being transmitted to the vibrating wire assembly to generate stress signals that are caused by the self-expansion of the lining structure, which may cause measurement error. Specifically, the vibrating wire assembly is provided in the vibrating wire measurement space composed of a stress trigger sleeve and a pair of anchoring disks. When the lining is subjected to external stress, a certain internal force will be generated.

Abstract: The present disclosure discloses a deformation and control simulation test system for a tunnel engineering supporting structure, including a follow-up hoisting platform, actuators, a control system. It is horizontal structure. The follow-up hoisting platform reduces the friction caused by the weight of testing sample and facilitates experimental operations. Each actuator fixed on an annular box body reaction frame can move independently through a control system in form of force control or displacement control mode, and can achieve circumferential contraction loading through its gomphodont configuration. The hinged and curved design of the cushion blocks of actuators can adapt to the circumferential contraction deformation of a test sample and maintain a close fit with them during the loading process.

Abstract: A disclosed computer-implemented method may include receiving, as part of a demodulation reference signal (DMRS) channel estimation operation, a frequency domain channel estimation signal comprising a plurality of DMRS samples, and generating an extended channel estimation signal by: (A) determining an extended DMRS sample that extends at least one edge of the channel estimation signal based on: (i) an edge DMRS sample included in the plurality of DMRS samples at the edge of the channel estimation signal, and (ii) at least one additional DMRS sample included in the plurality of DMRS samples, and (B) extending the edge of the channel estimation signal by including the DMRS samples and the extended DMRS sample in the extended channel estimation signal. The method may also include generating an augmented channel estimation signal by extrapolating a frequency edge for the augmented channel estimation signal. Various other systems and methods are also disclosed.

Abstract: A true three-dimensional physical simulation system for the influence of fault movement on tunnel operation and a test method are disclosed. The system includes a fault movement rack system, a fault movement jacking system, and a loading and movement control system. The fault movement rack system is configured to accommodate a movement model and serves as a loading reaction device. The fault movement jacking system is configured to implement fault movement and ensures that the model is not twisted and overturned in a fault movement process. The loading and movement control system is configured to perform initial ground stress loading on the model and control the fault movement jacking system to implement fault movement of the model.

Abstract: A true three-dimensional physical simulation system for the influence of fault movement on tunnel operation and a test method, including a fault movement rack system, a fault movement jacking system, and a loading and movement control system. The fault movement rack system accommodates a movement model and serves as a loading reaction device. The fault movement jacking system implements fault movement and ensures that the model is not twisted and overturned in a fault movement process. The loading and movement control system performs initial ground stress loading on the model and controls the fault movement jacking system to implement fault movement of the model. Fault movement of a deep stratum under a complex high ground stress condition can be simulated, the influence of underground fault movement on safe and stable operation of a deep tunnel is simulated, and a powerful technical support is provided for safe construction of deep engineering.

Abstract: This application relates to a hard-shell inclusion strain gauge for 3D stress in surrounding rockmass of underground engineering. The hard-shell inclusion strain gauge comprises an elastic cylinder and at least three sets of strain rosettes, wherein the elastic cylinder is installed in a borehole of underground engineering, and at least three sets of strain rosettes are equidistant along the circumference on the inner wall of the elastic cylinder. It can accurately measure strain values and variables of each strain rosette through data collection and transmission module, and calculate 3D stress in surrounding rock of underground engineering. It can obtain dynamic long-term monitoring of 3D stress evolution in complex environments of underground engineering, truly reflecting the real-time state, the spatial distribution, and the evolution of 3D stress in rockmass, and provide in-situ basic data for engineering disaster warning and control.

Abstract: The present disclosure discloses a deformation and control simulation test system for a tunnel engineering supporting structure, including a follow-up hoisting platform, actuators, a control system. It is horizontal structure. The follow-up hoisting platform reduces the friction caused by the weight of testing sample and facilitates experimental operations. Each actuator fixed on an annular box body reaction frame can move independently through a control system in form of force control or displacement control mode, and can achieve circumferential contraction loading through its gomphodont configuration. The hinged and curved design of the cushion blocks of actuators can adapt to the circumferential contraction deformation of a test sample and maintain a close fit with them during the loading process.

Abstract: The disclosed computer-implemented method may include (1) determining a first stage estimated passive inter-modulation (PIM) noise using a nonlinear model, the nonlinear model receiving a nonlinear model input based on a transmitted signal, (2) training the nonlinear model using a training signal based on an uncorrected received signal, (3) determining an estimated PIM noise using the first stage estimated PIM noise and a finite impulse response (FIR) filter, (4) training the FIR using a second training signal based on the uncorrected received signal, and (5) subtracting the estimated PIM noise from the uncorrected received signal. Various other methods, systems, and devices are also disclosed.

Abstract: An apparatus, system and method for controlling airflow is described. The apparatus comprises a wall which delimits a flared bore. The apparatus further comprises at least one air guide member which retractably protrudes into the flared bore from the wall. The flared bore widens to an outlet, thereby to permit a diverging airflow to be expelled therefrom when each of the at least one air guide member is retracted. When the at least one air guide member protrudes into the flared bore, air flowing in the flared bore is guided by a surface, e.g. a concave surface, of the respective air guide member away from the wall and towards the outlet. The retractable air guide member thus enables the direction and/or degree of convergence of the air flowing out of the outlet to be controlled.

Abstract: Embodiments of the present disclosure provide a method for temperature detection. The method comprises obtaining a sensed temperature from a sensor, the sensor being in a mounted mode where the sensor is thermally radiated by a variable heat source and a fixed heat source; determining a temperature change rate of the sensor and at least one affecting factor that affects temperature sensing of the sensor; and determining a temperature of the variable heat source based on the sensed temperature, the temperature change rate, and the affecting factor. According to the method of the present disclosure, the temperature of the variable heat source such as an ambient temperature can be obtained or determined without a dedicated sensor and cables. With this method, the ambient temperature can be determined by a sensor for sensing a temperature of a heating element such as a battery, a control unit or the like.

Abstract: The present invention relates to a layered semi-parallel LDPC decoder system having a single permutation network, and belongs to the field of decoder hardware design. The system comprises a layered decoding architecture of the single permutation network, a layered semi-parallel decoding architecture of the single permutation network, a pipeline design for layered semi-parallel decoding and a hardware framework of a layered semi-parallel LDPC decoder. The present invention removes a permutation network module between a check node and a variable node by modifying the cyclic shift value of each information block transferred from the variable node to the check node, i.e., the cyclic shift operation of the decoder can be completed through the single permutation network so as to reduce hardware resources of the decoder. A semi-parallel decoding structure is adopted, and meanwhile, a pipeline is added between half layers.

Abstract: A face mask has a centrifugal fan assembly, with a radial outlet outside the mask cavity. A flow adjusting element is added to prevent outlet flow from the fan assembly traveling along the outside of the mask and reaching the user, for example at the neck.

Abstract: The invention provides a monitoring device for monitoring an air cleaning system for determining when a particle filter of the air cleaning system needs cleaning or replacement. The monitoring device is a remote unit for application to the air cleaning system when a periodic monitoring function is to be performed. It is used to monitor changes in the sound made by the air cleaning system over time to derive information relating to the filter status.

Abstract: Methods and apparatus for determining levels of gaseous elements and optionally utilizing the determined levels to calibrate one or more sensors of an air purifier. For example, in some implementations a first image is captured of a colorimetric sensor device at the start of a sensing period and a second image is captured of the colorimetric sensor device at the end of the sensing period. The colorimetric sensor device includes at least one colorimetric sensor configured to change colors in response to reaction with a gaseous pollutant. Values may be determined based on the colors of the colorimetric sensor in the first and second images and the values may be utilized to determine a pollution value indicative of the amount of the gaseous pollutant to which the colorimetric sensor was exposed during the sensing period.

Abstract: The present invention relates to a method and a device for performing PCO reaction. The method comprises steps of: guiding an air flow into a PCO reactor, which PCO reactor contains photocatalyst for the PCO reaction; splitting the air flow into a first stream and a second stream, wherein quantity of the first stream being less than quantity of the second stream; obtaining the humidity of the photocatalyst; controlling the humidity of the first stream according to the obtained humidity of the photocatalyst; adjusting the humidity of the photocatalyst by guiding the first stream to the photocatalyst; guiding the second stream through the photocatalyst; and illuminating the photocatalyst with light. By controlling the humidity of air passing through the photocatalyst oxidation based on the obtained humidity of the photocatalyst, PCO reaction can be performed effectively.

Abstract: A filter element (1) for use in a gas purification device (100) is disclosed. It comprises a substrate (10) and a filter layer (20) covering an exterior surface of the substrate (10). The substrate (10) comprises material for containing chemicals (30) effective to remove gas pollutants from a gas. The material of the filter layer (20) is hydrophilic to adsorb liquid solution adsorbents effective in removing gas pollutants from a gas, and the exterior surface of the substrate (10) covered by the filter layer (20) is hydrophobic.