Abstract: Some embodiments of the disclosure disclose a space assembly system based on fusion of on-orbit additive manufacturing and ground-based launch. In some examples, an operator establishes a space manufacturing center to achieve on-orbit manufacturing of spacecraft structural components and assembles the components manufactured on orbit with spacecraft enabling modules launched from the ground to form a target spacecraft. The system includes a physical subsystem, a digital twin subsystem, and a communication subsystem. The physical subsystem includes a control unit, a communication unit, a sensor unit, an imaging and positioning device, a data storage unit, a data processing unit, an additive manufacturing unit, a space robot unit, and a raw material bin. The digital twin subsystem remotely monitors the physical subsystem. The communication subsystem establishes a connection between the physical subsystem and the digital twin subsystem and a connection between all units and devices of the physical subsystem.

Abstract: Disclosed is a turbine vane thermal barrier coating working condition simulation experiment test system, including: a working state simulation device, a service environment simulation device and a detection device. The working state simulation device is provided on one side of the turbine vane thermal barrier coating to be tested, is connected to the turbine vane thermal barrier coating to be tested, and is configured to simulate a high-speed rotation working state of the turbine vane thermal barrier coating to be tested. The service environment simulation device is provided on the other side of the turbine vane thermal barrier coating to be tested. The detection device is configured to detect damage generated when the turbine vane thermal barrier coating to be tested rotates at a high speed in the service environment.

Abstract: Provided are a device and a method for measuring pore size distribution of porous media through a harmonic analysis. The device includes a signal application system, instruments for measuring pressure and displacement, a signal processing instrument and a sample and fluid storage container. According to the disclosure, an oscillating flow is applied to a sample through the signal application system, pressure and displacement signals are collected by the signal processing instrument, a harmonic analysis is performed on the signals, and a frequency response of admittances of the porous media is calculated according to harmonic analysis results of the signals, so that the pore size distribution is obtained.

Abstract: A gate-last ferroelectric field effect transistor includes a substrate, isolation regions, a gate structure, a side wall spacer, source and drain regions, a first metal silicide layer and an interlayer dielectric layer which are sequentially arranged from bottom to top; the present disclosure further provides a manufacturing method of a gate-last ferroelectric field effect transistor; according to structural characteristics of the gate-last ferroelectric field effect transistor and crystalline characteristics of a hafnium oxide-based ferroelectric film, a dummy gate is first introduced in a manufacturing process of the gate-last ferroelectric field effect transistor; afterwards, high-temperature annealing is performed to make sure that an unannealed hafnium oxide-based film is crystallized to form a ferroelectric phase; finally the dummy gate is removed and a gate electrode layer is deposited to meet performance requirements of the gate-last ferroelectric field effect transistor; and the gate-last ferroelectr

Abstract: A catalyst including platinum (Pt) and a composite support. The composite support includes ZrO2/mesoporous silica sieve SBA-15. The platinum accounts for 0.01-0.3 wt. % of the catalyst. ZrO2 accounts for 5-20 wt. % of the composite support.

Abstract: A NAND ferroelectric memory cell with a three-dimensional structure and a preparation method thereof are provided, the ferroelectric memory cell comprises: an oxide insulating layer, a channel layer, a channel buffer layer, a ferroelectric layer, and/or a gate buffer layer, and a gate arranged successively from the inside to the outside. In the memory cell of the present disclosure, the buffer layer has the following effects: 1. It can induce the crystallization of ferroelectric film to form ferroelectric phase; 2. It can reduce adverse effects caused by different crystalline characteristics of the channel layer and the ferroelectric layer, improve the quality and uniformity of the deposited film; 3. It can enhance the interface property of the channel layer, reduce leakage current, and enhance endurance of the device. Therefore, the buffer layer can improve the overall storage property and homogeneity of memory cells with a three-dimensional structure.

Abstract: The present invention provides a method and a system for train periodic message scheduling based on a multi-objective evolutionary algorithm, relating to the field of information and communications technology, mainly including: acquiring an MVB periodic message table; binary encoding the MVB periodic message table and initializing it randomly, to generate an iterative population; performing crossover and mutation operations on the individuals of the iterative population using a genetic algorithm, to update the iterative population; constructing an MVB periodic scheduling table that meets scheduling needs and minimizes the macro cycle according to a multi-objective algorithm and the updated iterative population; scheduling train periodic messages according to the MVB periodic scheduling table, thereby meeting the real-time requirement of periodic data transmission in actual scheduling scenarios.

Abstract: The present disclosure discloses a method for optimizing equipment capacity and equipment power of an energy hub system. The method includes establishing an energy hub model containing natural gas boilers, electric boilers, coolers and heat pumps, establishing a bilevel optimized upper model to solve the optimal heat pump capacity, and establishing a bilevel optimized lower model to solve the optimal power utilization of each energy device based on the binary search algorithm of the quadratic function solves the upper model by using the multi-objective evolutionary algorithm NSGA-II to solve the lower model. The optimization method of the present invention can solve the multi-objective bilevel model problem without the help of commercial optimization software. Obtaining a reasonable, efficient and green planning scheme makes the total operating cost and total exhaust gas emissions of the energy hub relatively optimal.

Abstract: Some embodiments of the disclosure disclose a space assembly system based on fusion of on-orbit additive manufacturing and ground-based launch. In some examples, an operator establishes a space manufacturing center to achieve on-orbit manufacturing of spacecraft structural components and assembles the components manufactured on orbit with spacecraft enabling modules launched from the ground to form a target spacecraft. The system includes a physical subsystem, a digital twin subsystem, and a communication subsystem. The physical subsystem includes a control unit, a communication unit, a sensor unit, an imaging and positioning device, a data storage unit, a data processing unit, an additive manufacturing unit, a space robot unit, and a raw material bin. The digital twin subsystem remotely monitors the physical subsystem. The communication subsystem establishes a connection between the physical subsystem and the digital twin subsystem and a connection between all units and devices of the physical subsystem.

Abstract: Some embodiments of the disclosure provides an intelligent modularized reconstruction system for a spacecraft based on analysis of a task text. In some examples, the intelligent modularized reconstruction system includes a modularized spacecraft component library, a modularized spacecraft component recommendation subsystem, a target spacecraft generation subsystem, and a three-dimensional simulation environment. In other examples, for a new spacecraft reconstruction task, the modularized spacecraft component recommendation subsystem recommends a type and a quantity of required modularized components from the modularized spacecraft component library for input task text. Each modularized component recommended by the modularized spacecraft component recommendation subsystem is used to generate three-dimensional model data of a target spacecraft by the target spacecraft generation subsystem. The three-dimensional simulation environment displays the generated three-dimensional model data of the target spacecraft.

Abstract: An observable micro-nano mechanical testing apparatus and an observable micro-nano mechanical testing method are provided. The apparatus includes a supporting component, a driving component, a bearing component and an imaging component. The driving component and the imaging component are respectively vertically arranged on the supporting component, the bearing component is horizontally arranged on the supporting component and positioned below the driving component and the imaging component, the bearing component is used for bearing a sample and moving the sample, the driving component is used for driving an indenter to apply loads on the sample so as to form an indentation on the sample, and the imaging component is used for observing and analyzing the indentation on the sample.

Abstract: A load control method and a load control system of an indenter based on fuzzy predictive control, are provided. The method includes acquiring an actual measured force value of a sensor and an expected force value of the nth cycle in the loading stage; calculating a first error and a change rate; establishing and optimizing a fuzzy predictive controller; determining movement steps of a motor in the loading stage; acquiring the actual measured value of the sensor and an expected force value of the nth cycle in the full load stage; controlling the movement of the motor; acquiring the actual measured force value of the sensor and an expected force value of the nth cycle in the unloading stage; calculating a third error and a change rate; and determining the movement steps of the motor in the unloading stage.

Abstract: A PMSM sensorless composite control method with dual sliding-mode observers is provided. In particular, two sliding-mode observers are designed, one provides an exponential piecewise sliding-mode function for observation of back electromotive force, and the other sliding-mode observer is for observation of load torque and fine-tuning parameters of a piecewise PI controller while introducing an estimated load torque onto a q-axis for feedforward compensation. A q-axis current inner loop is designed with a second-order sliding-mode controller, which can improve tracking performance of q-axis current and indirectly control an electromagnetic torque. The exponential piecewise sliding-mode function is more conductive to the observation of back electromotive force and can weaken the buffeting phenomenon. The sliding-mode observer for observing the load torque fine-tunes parameters of the piecewise PI controller while performing the feedforward compensation, the load capability of the system is improved.

Abstract: A hafnium oxide-based ferroelectric field effect transistor includes a substrate, an isolation region arranged around the substrate; a gate structure including a buffer layer, a floating gate electrode, a hafnium oxide-based ferroelectric film layer, a control gate electrode and a film electrode layer which are sequentially stacked from bottom to top at a middle part of an upper surface of the substrate, a side wall arranged outside the gate structure, a source region and a drain region arranged oppositely at two sides of the gate structure and are formed by extending from an inner side of the isolation region to the middle part of the substrate, a first metal silicide layer formed by extending from the inner side of the isolation region to the side wall, and a second metal silicide layer arranged on an upper surface of the gate structure.

Abstract: The present disclosure discloses an observable micro-nano mechanical testing apparatus and method. The apparatus includes a supporting component, a driving component, a bearing component and an imaging component. The driving component and the imaging component are respectively vertically arranged on the supporting component, the bearing component is horizontally arranged on the supporting component and positioned below the driving component and the imaging component, the bearing component is used for bearing a sample and moving the sample, the driving component is used for driving an indenter to apply loads on the sample so as to form an indentation on the sample, and the imaging component is used for observing and analyzing the indentation on the sample. Based on the testing method conducted by the testing apparatus in the present disclosure, mechanical property parameters of materials can be effectively measured; the structure is simple; and accuracy of measurement results is high.

Abstract: Disclosed is a method and system for determining a motion path of a mechanical arm in which, after a kinematics model of a mechanical arm is established, multiple objective optimization functions are constructed according to the model, theoretical coordinates of a tail end of the arm, and an arm length. If a number of individuals in an evolutionary population, that makes both lateral and longitudinal error optimization functions in an optimization function monotonically increase or decrease, reaches the threshold, an optimal solution is determined using a single-objective evolutionary algorithm; otherwise, a multi-objective evolutionary algorithm is used. The multi- or single-objective evolutionary algorithms can be adaptively selected according to the number of individuals in the population that makes the lateral and longitudinal error optimization functions change.

Abstract: A NAND ferroelectric memory cell with a three-dimensional structure and a preparation method thereof are provided, the ferroelectric memory cell comprises: an oxide insulating layer, a channel layer, a channel buffer layer, a ferroelectric layer, and/or a gate buffer layer, and a gate arranged successively from the inside to the outside. In the memory cell of the present disclosure, the buffer layer has the following effects: 1. It can induce the crystallization of ferroelectric film to form ferroelectric phase; 2. It can reduce adverse effects caused by different crystalline characteristics of the channel layer and the ferroelectric layer, improve the quality and uniformity of the deposited film; 3. It can enhance the interface property of the channel layer, reduce leakage current, and enhance endurance of the device. Therefore, the buffer layer can improve the overall storage property and homogeneity of memory cells with a three-dimensional structure.

Abstract: A gate-last ferroelectric field effect transistor includes a substrate, isolation regions, a gate structure, a side wall spacer, source and drain regions, a first metal silicide layer and an interlayer dielectric layer which are sequentially arranged from bottom to top; the present disclosure further provides a manufacturing method of a gate-last ferroelectric field effect transistor; according to structural characteristics of the gate-last ferroelectric field effect transistor and crystalline characteristics of a hafnium oxide-based ferroelectric film, a dummy gate is first introduced in a manufacturing process of the gate-last ferroelectric field effect transistor; afterwards, high-temperature annealing is performed to make sure that an unannealed hafnium oxide-based film is crystallized to form a ferroelectric phase; finally the dummy gate is removed and a gate electrode layer is deposited to meet performance requirements of the gate-last ferroelectric field effect transistor; and the gate-last ferroelectr

Abstract: A hafnium oxide-based ferroelectric field effect transistor includes a substrate, an isolation region arranged around the substrate; a gate structure including a buffer layer, a floating gate electrode, a hafnium oxide-based ferroelectric film layer, a control gate electrode and a film electrode layer which are sequentially stacked from bottom to top at a middle part of an upper surface of the substrate, a side wall arranged outside the gate structure, a source region and a drain region arranged oppositely at two sides of the gate structure and are formed by extending from an inner side of the isolation region to the middle part of the substrate, a first metal silicide layer formed by extending from the inner side of the isolation region to the side wall, and a second metal silicide layer arranged on an upper surface of the gate structure.

Abstract: Disclosed is a turbine vane thermal barrier coating working condition simulation experiment test system, including: a working state simulation device, a service environment simulation device and a detection device. The working state simulation device is provided on one side of the turbine vane thermal barrier coating to be tested, is connected to the turbine vane thermal barrier coating to be tested, and is configured to simulate a high-speed rotation working state of the turbine vane thermal barrier coating to be tested. The service environment simulation device is provided on the other side of the turbine vane thermal barrier coating to be tested. The detection device is configured to detect damage generated when the turbine vane thermal barrier coating to be tested rotates at a high speed in the service environment.