Abstract: An antenna system, installed on a base, includes: a first group of MIMO antennas, including multiple first MIMO antennas, and each first MIMO antenna is provide with a grounding structure and a fence like structure perpendicular to the base; a second group of MIMO antennas, comprising multiple second MIMO antennas, and each second MIMO antenna is a planar structure, arranged on a substrate, and the substrate is fixed to the base through a support column and the substrate is parallel to the base; a third group of MIMO antennas, comprising multiple third MIMO antennas, and each third MIMO antenna includes a dielectric structure and a wire structure perpendicular to the base, and the wire structure excites the dielectric structure; an AUX antenna, provided with a T-shaped slot parallel to the base.

Abstract: An antenna system, installed on a base, includes: a first group of MIMO antennas, including multiple first MIMO antennas, and each first MIMO antenna is provide with a grounding structure and a fence like structure perpendicular to the base; a second group of MIMO antennas, comprising multiple second MIMO antennas, and each second MIMO antenna is a planar structure, arranged on a substrate, and the substrate is fixed to the base through a support column and the substrate is parallel to the base; a third group of MIMO antennas, comprising multiple third MIMO antennas, and each third MIMO antenna includes a dielectric structure and a wire structure perpendicular to the base, and the wire structure excites the dielectric structure; an AUX antenna, provided with a T-shaped slot parallel to the base.

Abstract: In one aspect, the present application provides a computer-implemented method for generating a digital data set representing a target tooth arrangement, comprising: obtaining a first 3D digital model representing an initial tooth arrangement; extracting at least one feature from each tooth of the first 3D digital model; generating a feature vector based on the extracted features; and aligning the first 3D digital model using a Statistical Shape Model based on the feature vector to obtain a second 3D digital model representing a target tooth arrangement.

Abstract: The present application provides a computer-implemented method for generating a digital data set representing a target tooth arrangement, comprising: obtaining a first and a second 3D digital models respectively representing upper jaw teeth and lower jaw teeth under an initial tooth arrangement, where the first and the second 3D digital models are in a predetermined relative positional relationship; extracting a tooth level feature vector from each tooth of the first and second 3D digital models; preliminarily aligning the first and second 3D digital models based on the tooth level feature vectors using a trained first deep neural network; extracting a jaw level feature vector for each tooth of the preliminarily aligned first and second 3D digital models; and further aligning the preliminarily aligned first and second 3D digital models to obtain a target tooth arrangement based on the jaw level feature vectors using a trained second deep neural network.

Abstract: A combination of lookup tables for waveforms and several scaling and delay factors to accurately simulate touch and collision transducer sensor output without the complexity of solving the classical wave equation or performing convolutions in the frequency domain. TACT, as used herein, is a touch and collision transducer sensor used for detecting collisions. When the vehicle collides with an object a wave will be generated by the touch and collision transducer sensors. The waveform can take many forms depending on various parameter. Pre-recorded waveforms can be used to simulate the collisions and produce appropriate outputs. However, the present disclosure contemplates more complex, diverse waveforms which can be produced based on the existing pre-recorded libraries. To this end, simulated waveforms can be produced by scaling, filtering, delaying and combining with road noise, based on the impact material and contact area, at least in part.

Abstract: A method, device, and system for evaluating geological and engineering sweet spots in an unconventional reservoir based on dual-energy computed tomography (CT) comprises acquiring and preprocessing a high-energy CT image and a low-energy CT image of a core from a core region, acquiring and preprocessing a high-energy CT image and a low-energy CT image of a core from a core reference sample, calculating a density and an effective atomic number of each pixel in the core region of a target reservoir, acquiring a geological sweet spot index and an engineering sweet spot index, acquiring evaluation results of geological and engineering sweet spots at different depths of the core region in the target reservoir, and matching the evaluation results to acquire reservoir types corresponding to the different depths of the core region in the target reservoir. The present disclosure achieves accurate and efficient reservoir evaluation and classification.

Abstract: In one aspect, the present application provides a computer-implemented method for generating a digital data set representing a target tooth arrangement, comprising: obtaining a first 3D digital model representing an initial tooth arrangement; extracting at least one feature from each tooth of the first 3D digital model; generating a feature vector based on the extracted features; and aligning the first 3D digital model using a Statistical Shape Model based on the feature vector to obtain a second 3D digital model representing a target tooth arrangement.

Abstract: The present application provides a computer-implemented method for generating a digital data set representing a target tooth arrangement, comprising: obtaining a first and a second 3D digital models respectively representing upper jaw teeth and lower jaw teeth under an initial tooth arrangement, where the first and the second 3D digital models are in a predetermined relative positional relationship; extracting a tooth level feature vector from each tooth of the first and second 3D digital models; preliminarily aligning the first and second 3D digital models based on the tooth level feature vectors using a trained first deep neural network; extracting a jaw level feature vector for each tooth of the preliminarily aligned first and second 3D digital models; and further aligning the preliminarily aligned first and second 3D digital models to obtain a target tooth arrangement based on the jaw level feature vectors using a trained second deep neural network.

Abstract: The present application belongs to the technical field of oil and gas exploration and development, and specifically provides a rock stratification identification method and apparatus, a device and a storage medium. The method includes: acquiring multiple sets of CT slice images of a rock, where each set of the CT slice images include a first CT slice image and a second CT slice image, the first CT slice image and the second CT slice image are acquired by scanning a same depth section of the rock, scanning energy corresponding to the first CT slice image is different form scanning energy corresponding to the second CT slice image; determining multiple dual energy indices of the rock according to the multiple sets of CT slice images; and determining a rock stratification according to the multiple dual energy indices, which can identify stratification of a large-scale rock by using CT.

Abstract: The present disclosure belongs to the field of petroleum exploration and development and, in particular, relates to a system and a method for analyzing while-drilling rock fragments in oil and gas field. The system includes a sample preparation mold and a sample scanning apparatus; the mold is configured to quickly batch prepare fragments into scanning ready samples; the apparatus is portable and configured for batch scanning and analyzing the samples, and having the capabilities of anti-vibration, temperature control, dust prevention, and adaptability to a harsh well site environment; the method includes a scanning step where surface images, elements and mineral types of rock can be rapidly quantitatively analyzed, and lithologies thereof can be identified; the method also includes the analysis step in which rock's elastic parameters and target zone of the vertical well are determined, and geosteering and design of staged fracturing of horizontal well can be provided.

Abstract: A Medical Ultrasound System with circular formation elements placement ultrasonic transducer. Each element of transducer generates the ultrasonic signal to human or animal body. Receiving signal from the transducer elements on same circle is directly connected and summed. The summed signal of each element circle is independently delayed by the digital controlled delay and then summed by the adder. The final summed signal after the adder is sent to Post Processing Unit. Post Processing Unit processes the final summed signal for the medical diagnosis, and the beam line is from the center of the circular plane of the transducer elements formation and perpendicular to this plane. The ultrasonic transducer has MEMS based motion sensors: accelerometer-sensors and gyro-sensors built in. The MEMS based motion sensors send the real-time transducer location and angle information to Post Processing Unit.

Abstract: The present disclosure belongs to the field of petroleum exploration and development and, in particular, relates to a system and a method for analyzing while-drilling rock fragments in oil and gas field. The system includes a sample preparation mold and a sample scanning apparatus; the mold is configured to quickly batch prepare fragments into scanning ready samples; the apparatus is portable and configured for batch scanning and analyzing the samples, and having the capabilities of anti-vibration, temperature control, dust prevention, and adaptability to a harsh well site environment; the method includes a scanning step where surface images, elements and mineral types of rock can be rapidly quantitatively analyzed, and lithologies thereof can be identified; the method also includes the analysis step in which rock's elastic parameters and target zone of the vertical well are determined, and geosteering and design of staged fracturing of horizontal well can be provided.

Abstract: A dual band dipole antenna for universal LTE wireless communication is provided. The antenna can include first, second, and third dipoles etched on a single printed circuit board, wherein each of the first, second, and third dipoles have respective resonance lengths and operate in respective frequency ranges so that the antenna, as a whole, operates in a first frequency range of from approximately 690 MHz to approximately 960 MHz and in a second frequency range of from approximately 1710 MHz to approximately 2800 MHz. For example, the first dipole can operate at frequencies from approximately 690 MHz to approximately 800 MHz and from approximately 1710 MHz to approximately 2700 MHz, the second dipole can operate at frequencies from approximately 800 MHz to approximately 960 MHz and at approximately 1900 MHz, and the third dipole can operate at frequencies from approximately 2000 MHz to approximately 2400 MHz.

Abstract: A wide band LTE antenna that can operate in a frequency range of from approximately 690 MHz to approximately 2700 MHz is provided. The antenna can include a first PCB including a first conductor and a second PCB including a second conductor. A first plurality of arms of the first conductor and a first plurality of arms of the second conductor can be connected to a feed microstrip line disposed on a first side of the second PCB, a second plurality of arms of the first conductor and a second plurality of arms of the second conductor can be connected to a ground connection disposed on a second side of the second PCB, and the feed microstrip line can avoid connection with the second plurality of arms of the first conductor and with the second plurality of arms, of the second conductor.

Abstract: A distributed fiber sensor system based on Brillouin scattering. Two DFB lasers are included that are frequency offset locked to each other. The frequency offset is approximately equal to the Brillouin shift in optical fibers of about 11 GHz. The locking is realized by first modulating the output of one DFB laser with an electro-optic modulator to generates side bands that are about 11 GHz from the carrier, and then by locking the other DFB laser to the upper side band with a PID controller which controls its driving current.

Abstract: A fiber optic strain sensor, an optical pulse generator generates an initial optical pulse, and launches it into an optical fiber-optical strain probe chain through an optical circulator. The scattered optical power in the optical fiber and optical strain probe chain is sent to an optical receiver, also via the optical circulator. The optical strain probes are attached to a structure whose strain is to be measured. Strain in the structure causes the fiber bend loss to change in the strain probe, and causes the scattered optical power received by the optical receiver to change accordingly. From the change of the output of the optical receiver and the time required for the scattered optical power to travel from the probe, the strain at each of the probes is calculated.

Abstract: An electric security fence. An electric signal generator generates an initial electric signal. The generated initial electric signal is transmitted through a transmission line. The transmission line will generate a reflected electric signal when the transmission line is disturbed by the presence of a human or animal at a disturbance area. A receiver receives the reflected electric signal and forwards it to a signal processing unit. The signal processing unit calculates the location of the disturbance area after receiving the reflected electric signal. In one preferred embodiment, the signal processing unit calculates the location of the disturbance area by determining the amount of time required for the reflected signal to travel from the disturbance area.

Abstract: A handheld fiber optic current and voltage monitor for applications in high voltage environment. A light source generates constant optical signal that is split by a fiber optic splitter into two paths. One path feeds a DMEMS based current sensor that is driven by a current to voltage conversion device that converts the current in a conductor into a voltage. The other path goes to a DMEMS based electric field sensor driven by a condenser antenna that converts the electric field near a high voltage power line conductor into a voltage. The output optical signals from the current sensor and the electric field sensor are received by respective optical receivers and converted into electric signals. A signal processing unit processes the signals, and a display screen displays the results. All these are mounted on a plastic mast for handheld operation.

Abstract: A handheld fiber optic current and voltage monitor for applications in high voltage environment. A light source generates constant optical signal that is split by a fiber optic splitter into two paths. One path feeds a DMEMS based current sensor that is driven by a current to voltage conversion device that converts the current in a conductor into a voltage. The other path goes to a DMEMS based electric field sensor driven by a condenser antenna that converts the electric field near a high voltage power line conductor into a voltage. The output optical signals from the current sensor and the electric field sensor are received by respective optical receivers and converted into electric signals. A signal processing unit processes the signals, and a display screen displays the results. All these are mounted on a plastic mast for handheld operation.

Abstract: An electric repeater for use in transmission line based electric fences. The electric repeater comprises a forward amplifier, a backward amplifier, a quad pole quad throw signal switch, and a monostable circuit. The short forward electric pulse in the transmission line is amplified by the forward amplifier, and the amplified electric pulse trigger the monostable circuit. The monostable circuit then outputs a n electric pulse with predetermined width. This electric pulse operates the quad pole quad throw signal switch such that the wire pair of the transmission line is connected to the backward amplifier and disconnected from the forward amplifier as soon as the forward electric pulse has passed through the forward amplifier. DC electric power is supplied to the forward amplifier and backward amplifier by the transmission line metal wire pair, and two pairs of capacitors are used to block this DC electric power from entering the input and output of the forward and backward amplifiers.