HAINAN UNIVERSITY

An integrated metal hydrogen-oxygen fuel cell system based on aluminum-lithium alloy is provided. By optimizing the element composition and surface morphology of the negative electrode of a metal-air cell, the working voltage of the cell is kept stable, and the hydrogen generation efficiency and stability are significantly improved. The 2195 aluminum-lithium alloy is selected as the negative electrode to enhance the electrochemical activity, and more reaction sites are exposed through the optimized morphology to ensure the continuous generation of hydrogen by side reactions, thus providing sufficient and stable fuel for hydrogen-oxygen fuel cells.

Provided is a connecting structure with three-dimensional shock absorption and energy absorption buffering. During an earthquake, a rotational connecting device enables an upper structure to only undergo a rigid body swiveling around the rotational connecting device and rock as a whole within a design-allowed range. Further, energy is absorbed and dispersed through deformation and energy dissipation of vertical connecting devices to mitigate earthquake impact on the upper structure. The above device achieves earthquake resistance and shock absorption, effectively reducing damage and destruction to the upper structure under strong earthquakes. The connecting structure has strong self-centering capability and is capable of effectively controlling its residual displacement after earthquake, thus preventing further damage to the upper structure and facilitating its repair. With earthquake resistant capability of the upper structure enhanced by the connecting structure, seismic performance requirements on design of the upper structure are lowered, thereby offering economic benefits.

Provided is a remote sensing image feature discretization method based on rough-fuzzy model, comprising the following steps: listing the digital number in each band and category of a selected sample in remote sensing images, and building an image information decision table based on the digital number and category; initializing the class center of each category and the membership degree of a sample example relative to the class center; updating the class center of each category and the membership degree of the sample example relative to the class center iteratively, and obtaining the final value of the class center of each category and the final value of the membership degree; building a rough-fuzzy set, computing the mean approximation accuracy of the rough-fuzzy set, discretizing the image information decision table, evaluating the discretization results based on the mean approximation accuracy and a genetic algorithm, and selecting an optimal discretization solution.

A rocking self-centering seismic/vibration prevention structure facilitating overall regulation includes an upper structure, a support mounting layer provided with an inner vertical member at a position of a plane centroid of the upper structure, and a foundation. Edge vertical members are arranged at intervals at a periphery of the upper structure in a contour direction thereof; the inner vertical member has an upper end connected to the upper structure, and a lower end connected to the foundation through a rotational hinge support for allowing the upper structure to generate rotational displacement and simultaneously limit translational displacement of the upper structure in a horizontal direction; vertical tension-compression supports mounted at the edge vertical members do not constrain lateral displacement of the upper structure, only provide compressive bearing capacity, and do not bear shear bearing capacity in the horizontal direction.

A modular graded energy-dissipation damper for resisting wind vibration and frequent, moderate, rare, and mega earthquakes includes an upper baseplate and a lower baseplate, where frequent earthquake energy dissipation components, moderate earthquake energy dissipation components, rare earthquake energy dissipation components and mega earthquake energy dissipation components are sequentially provided between the upper baseplate and the lower baseplate from the two ends to the middle; and further including wind vibration energy dissipation components provided between the upper baseplate and the lower baseplate and located at the two sides of the energy dissipation components, where the wind vibration energy dissipation component include an outer plate and an inner plate arranged at an interval and connected with the upper baseplate and the lower baseplate respectively, and a viscoelastic layer connected between the corresponding overlapping surfaces of the outer plate and the inner plate.

Disclosed are a lithium-ion adsorption material, a preparation method and use thereof. The preparation method includes: mixing sodium alginate, calcium carbonate, gluconolactone and water to obtain a sodium alginate hydrogel; The soaking the sodium alginate hydrogel into an oxidizing solution, and subjecting a resulting solution to oxidative ring-opening reaction to obtain an oxidized sodium alginate hydrogel; mixing the oxidized sodium alginate hydrogel, a dispersant, a solvent and a lithium-based compound, and subjecting an obtained mixture to aldol condensation reaction to obtain a lithium-based sodium alginate hydrogel; and subjecting the lithium-based sodium alginate hydrogel to acid-washing and freeze-drying in sequence to obtain the lithium ion adsorption material.

A feces color-based remote sensing estimation method and apparatus for Antarctic bird population size is disclosed, which comprises: determining a reflectance value range of a mixture of new feces and old feces in a remote sensing image; determining a sample mixture area where the mixture is located, based on the reflectance value range of the mixture in the remote sensing image; classifying the sample mixture area into a plurality of grade areas and determining an area of each grade area based on an obtained reflectance value of the sample mixture area; and generating a one-to-one correspondence between a density of birds of each grade area in the sample mixture area and the each grade area, based on the area of the each grade area and an obtained number of birds in the each grade area.

Recyclable cylindrical structures and usage methods are provided. A recyclable cylindrical structure includes multiple prefabricated cylindrical units. Each unit is provided with a ring block coaxially fixed on the top of the unit, a ring slot coaxially formed in the bottom of the unit, two first sealing rings arranged on the top of the unit and a second sealing ring arranged on the top of the ring block of the unit. The ring block is provided with multiple first connection elements. Multiple second connection elements are arranged in the ring slot. For two adjacent prefabricated cylindrical units of the recyclable cylindrical structure, the ring block of the lower unit inserts into the ring slot of the upper unit and the first connection elements of the lower unit are corresponding and jammed one-to-one with the second connection elements of the upper unit.

Disclosed in the present disclosure are a square-meter-scale stainless steel integrated electrode with a surface modified by bimetallic sulfide, and a preparation method and application thereof. The preparation method includes the following steps: (1) performing ultrasonic cleaning on a stainless steel substrate with deionized water, acetone and ethanol in sequence, performing heating and soaking with a dilute hydrochloric acid solution, and finally, performing drying after washing and cleaning with deionized water to obtain the stainless steel substrate with a clean surface; (2) dissolving two transition metal cation salts and a sulfur source in an aqueous solution and performing stirring at a room temperature for even mixing; and (3) putting the stainless steel substrate with the clean surface obtained in step (1) into the solution of the step (2) for a heating reaction, washing an obtained sample with water after the reaction is finished, and then, performing drying.

The disclosure provides a method, a device and a computer readable medium for determining the penguin population relating to the technical field of image processing. The method of one embodiment of the disclosure comprises the following steps: firstly acquiring the penguin habitat image detected by the unmanned airborne sensor; and acquiring an interest region with penguins distributing, and a gray value of the interest region from the penguin habitat image; then for any one of gray value: determining a penguin state according to the gray value; finally determining the penguin population according to the penguin state.